TOP BEDDING AND BEDDING COVER

Description

TECHNICAL FIELD

The present invention relates to a top bedding and a bedding cover.

BACKGROUND ART

When in use, a comforter with a cover thereon may experience displacement within the cover. PTL 1 proposes a comforter cover with tie strings. The comforter cover disclosed in PTL 1 is formed by sewing together a front fabric and a back fabric into a bag shape, has an opening for inserting and removing a comforter, and has tie strings inside for attaching them to the comforter. Multiple tie strings are provided at the periphery of the comforter cover.

PTL 2 proposes a comforter cover that does not have tie strings. This comforter cover has a rectangular opening formed along the periphery of the upper surface of the cover body, and right-angled triangular fabric pieces are sewn to each corner of the opening. Both end portions of the oblique side of each fabric piece overlap with other fabric pieces, and the oblique sides of the fabric pieces form a hole in the shape of, for example, a diamond or rectangle for inserting and removing a comforter at the center portion. Elastic materials are attached to the oblique side portions, making the oblique sides stretchable.

CITATION LIST

Patent Literature

PTL 1: JP3199806U

PTL 2: JPH07-30835U

SUMMARY OF INVENTION

Technical Problem

However, in order to attach the comforter cover of PTL 1 to a comforter, tying the tie strings to the comforter is necessary, which is troublesome. Furthermore, if the tie strings are located away from the opening of the comforter cover, reaching the tie strings from the opening is difficult, making it difficult to tie the comforter with the tie strings.

In the comforter cover of PTL 2, elastic materials are provided on the oblique sides of the fabric pieces that form the insertion/removal hole, and the elastic materials allow the comforter placed inside to closely contact the comforter cover to prevent displacement. However, simply providing the elastic materials does not allow the comforter to closely contact the comforter cover sufficiently, and displacement cannot be sufficiently prevented.

The present invention has been accomplished in view of the problems mentioned above. An object of the present invention is to provide a bedding cover that can be easily attached to a top bedding, such as a comforter, and that can prevent displacement. Another object of the present invention is to provide a top bedding to which a bedding cover, such as a comforter cover, can be easily attached, and that can prevent displacement.

Solution to Problem

In order to achieve the above object, the present invention encompasses the subject matter described in the following items.

Item 1: A top bedding having a front surface and a back surface, at least one of the front surface and the back surface having at least one anti-slip region, and the anti-slip region having a coefficient of friction of 0.8 or more.

Item 2: The top bedding according to Item 1, wherein the area of the anti-slip region accounts for 20% or more of the total area of the area of the front surface and the area of the back surface.

Item 3: The top bedding according to Item 1 or 2, wherein the area of the anti-slip region accounts for 40% or more of the area of the front surface or the area of the back surface.

Item 4: The top bedding according to any one of Items 1 to 3, wherein the top bedding is rectangular in plan view, and the anti-slip region is arranged based on any one of the following arrangements A to F:

• • arrangement A: the anti-slip region is strip-shaped in plan view and is provided along the width direction of the top bedding at a center portion in the length direction of the top bedding and on both sides in the length direction, sandwiching the center portion with intervals;
  • arrangement B: the anti-slip region is strip-shaped in plan view and is provided along the length direction of the top bedding at a center portion in the width direction of the top bedding and on both sides in the width direction, sandwiching the center portion with intervals;
  • arrangement C: the anti-slip region is strip-shaped in plan view and is provided along the width direction of the top bedding on both sides in the length direction of the top bedding;
  • arrangement D: the anti-slip region is strip-shaped in plan view and is provided along the length direction of the top bedding on both sides in the width direction of the top bedding;
  • arrangement E: the anti-slip region is strip-shaped in plan view and is provided on peripheral edge portions of the top bedding; and
  • arrangement F: the anti-slip region is rectangular in plan view and is provided at least at a center portion of the top bedding.

Item 5: A bedding cover, the bedding cover being configured to contain a bedding inside, the bedding cover having a first inner surface and a second inner surface, the bedding cover having at least one anti-slip region on at least one of the first inner surface and the second inner surface, the first inner surface and the second inner surface facing a front surface and a back surface of the bedding, and the anti-slip region having a coefficient of friction of 0.8 or more.

Item 6: The bedding cover according to Item 5, wherein the area of the anti-slip region accounts for 20% or more of the total area of the area of the first inner surface and the area of the second inner surface.

Item 7: The bedding cover according to Item 5 or 6, wherein the area of the anti-slip region accounts for 40% or more of the area of the first inner surface or the area of the second inner surface.

Item 8: The bedding cover according to any one of Items 5 to 7, wherein the bedding cover is rectangular in plan view, and the anti-slip region is arranged based on any one of the following arrangements A to F:

• • arrangement A: the anti-slip region is strip-shaped in plan view and is provided along the width direction of the bedding cover at a center portion in the length direction of the bedding cover and on both sides in the length direction, sandwiching the center portion with intervals;
  • arrangement B: the anti-slip region is strip-shaped in plan view and is provided along the length direction of the bedding cover at a center portion in the width direction of the bedding cover and on both sides in the width direction, sandwiching the center portion with intervals;
  • arrangement C: the anti-slip region is strip-shaped in plan view and is provided along the width direction of the bedding cover on both sides in the length direction of the bedding cover;
  • arrangement D: the anti-slip region is strip-shaped in plan view and is provided along the length direction of the bedding cover on both sides in the width direction of the bedding cover;
  • arrangement E: the anti-slip region is strip-shaped in plan view and is provided on peripheral edge portions of the bedding cover; and
  • arrangement F: the anti-slip region is rectangular in plan view and is provided at least at a center portion of the bedding cover.

Advantageous Effects of Invention

According to the present invention, displacement of a bedding cover with respect to a top bedding can be prevented.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a top bedding according to one embodiment of the present invention.

FIG. 2 is a plan view of a top bedding in which anti-slip regions are arranged based on arrangement A1.

FIG. 3 is a cross-sectional view along line A-A in FIG. 2, showing the state in which the top bedding is contained in a bedding cover.

FIG. 4 is a plan view of a top bedding in which anti-slip regions are arranged based on arrangement A2.

FIG. 5 is a plan view of a top bedding in which anti-slip regions are arranged based on arrangement B.

FIG. 6 is a plan view of a top bedding in which anti-slip regions are arranged based on arrangement C.

FIG. 7 is a plan view of a top bedding in which anti-slip regions are arranged based on arrangement D.

FIG. 8 is a plan view of a top bedding in which anti-slip regions are arranged based on arrangement E.

FIG. 9 is a plan view of a top bedding in which an anti-slip region is arranged based on arrangement F.

FIG. 10 is a perspective view of a bedding cover according to one embodiment of the present invention.

FIG. 11 is a plan view of a bedding cover in which anti-slip regions are arranged based on arrangement A1.

FIG. 12 is a cross-sectional view along line B-B of FIG. 11, showing the state in which a top bedding is contained.

FIG. 13 is a diagram illustrating a measurement system.

FIGS. 14 (A) and 14 (B) are diagrams illustrating a measurement method for displacement.

DESCRIPTION OF EMBODIMENTS

First Embodiment

An embodiment of the present invention is described with reference to the drawings. FIG. 1 is a perspective view of a top bedding 10 according to one embodiment of the present invention. FIG. 2 is a plan view of the top bedding 10. FIG. 3 is a cross-sectional view of the top bedding 10 contained in a known bedding cover 100. Below, FIGS. 1 to 14 are used for the purpose of explanation and are not used to represent the actual top bedding 10 or bedding cover 20.

The top bedding 10 includes comforters, blankets, and other items that are placed over the body when sleeping. The top bedding 10 is rectangular. Below, the top bedding 10 is described using, as an example, a single-size comforter having a length L11 in the width direction of 150 cm and a length L12 in the length direction of 210 cm.

The top bedding 10 according to this embodiment is not limited to be of the single size described above and may be of any size. The standard size of the top bedding 10 varies from country to country. For example, in Japan, commonly used sizes include a semi-double size (170 cm×210 cm), a double size (190 cm×210 cm), a queen size (210 cm×210 cm), and a king size (230 cm×210 cm). In the United States, commonly used sizes include a twin size (168 cm×218 cm), a twin XL size (168 cm×259 cm), a full size (203 cm×218 cm), a queen size (229 cm×229 cm), a king size (264 cm×229 cm), a California king size (274 cm×244 cm), and the like. In China, commonly used sizes include a single size (150 cm×200 cm), a double size (200 cm×230 cm), a queen size (220 cm×240 cm), a king size (240 cm×260 cm), and the like. The description in parentheses after each size indicates “the length L11 in the width direction×length L12 in the length direction”; however, these lengths are not strictly exact lengths and an error of several centimeters may occur.

As shown in FIG. 3, the top bedding 10 is formed by sewing together the peripheries of a front fabric 13 and a back fabric 14, and filling the internal space with a filling material 15. The outer surfaces, i.e., the upper and lower surfaces in FIG. 3, of the top bedding 10 are referred to as the “front surface 11” and the “back surface 12,” respectively. The top bedding 10 may be used with either the front surface 11 or the back surface 12 facing up, and there is no difference in the usage of the front surface 11 and the back surface 12.

Anti-slip Region

The top bedding 10 has at least one anti-slip region 30 on at least one of the front surface 11 and the back surface 12. In other words, the anti-slip region 30 forms at least part of the front surface 11 and/or the back surface 12 of the top bedding 10. The anti-slip region 30 has a coefficient of friction of 0.8 or more, and more preferably 0.91 or more. From the viewpoint of preventing displacement between the top bedding 10 and the bedding cover 100, a greater coefficient of friction is more preferable. “A coefficient of friction of 0.8 or more” means that either the static coefficient of friction or the kinetic coefficient of friction is 0.8 or more. Preferably, both the static coefficient of friction and the kinetic coefficient of friction are 0.8 or more. Static friction is the force that resists the initial movement of a surface sliding over another, and the force required to initiate the movement is equal to the force that resists the initial movement. The static coefficient of friction is the ratio between the static friction and the force acting perpendicular to the two surfaces of a test piece in a friction test. Kinetic friction is the force that resists the continuous sliding of one surface against another, and the force required for the continuous sliding is equal to the force that resists the continuous sliding. The kinetic coefficient of friction is the ratio between the kinetic friction and the force acting perpendicular to the two surfaces of a test piece in a friction test. The coefficient of friction is defined in JIS P8147:2010 (corresponding to ISO 15359:1999), and the coefficient of friction of the anti-slip region 30 is determined according to a measurement method based on JIS P8147:2010. JIS P8147:2010 defines the static coefficient of friction and the kinetic coefficient of friction.

In this embodiment, the anti-slip region 30 is composed of a fabric having an anti-slip function. The fabric constituting the anti-slip region 30 is overlapped and sewn onto the outer surface of the front fabric 13 and/or the outer surface of the back fabric 14 of the top bedding 10 to form the front surface 11 and/or the back surface 12 of the top bedding 10.

The fabric constituting the anti-slip region 30 may be any fabric that has a coefficient of friction of 0.8 or more. For example, the fabric constituting the anti-slip region 30 is a tricot knit fabric, the composition of the yarn used is 61% polyester and 39% spandex (polyurethane elastic fiber), and the basis weight is 79 gsm (gsm: weight (g) per square meter). The fabric constituting the anti-slip region 30 may be a woven fabric, knitted fabric, or the like whose surface has been subjected to an anti-slip treatment, such as a polyurethane coating (PU coating). A brushed fabric, such as suede, may also be used. The anti-slip region 30 preferably has a thickness that can maintain the coefficient of friction at 0.8 or more and that is as thin as possible so that the user does not feel the presence of the anti-slip region 30 when the top bedding 10 is used by placing in the bedding cover 100 (FIG. 3). Specifically, the thickness is preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1 mm or less.

In this embodiment, the front surface 11 and/or the back surface 12 of the top bedding 10 are formed by the overlapping of the front fabric 13 and the fabric constituting the anti-slip region 30 and/or the overlapping of the back fabric 14 and the fabric constituting the anti-slip region 30. However, the present invention is not limited to this configuration. For example, the front surface 11 and/or the back surface 12 of the top bedding 10 may be formed by joining the fabric constituting the front fabric 13 and the fabric constituting the anti-slip region 30 and/or joining the fabric constituting the back fabric 14 and the fabric constituting the anti-slip region 30, in a planar form and sewing them together.

The front surface 11 and the back surface 12 of the top bedding 10 may each be composed of a single piece of fabric, at least a portion of which may constitute the anti-slip region 30. The yarn that constitutes the fabric of the anti-slip region 30 may have an anti-slip function. In this case, as a material, a polyurethane-based yarn may be used, such as Lycra produced by Toray Opelontex Co., Ltd. or Roica produced by Asahi Kasei Corporation.

Alternatively, the anti-slip region 30 may be formed by applying a coating agent having an anti-slip effect to the surface of the front fabric 13 and/or the surface of the back fabric 14. The coating agent for use may be, for example, hydrogenated styrene thermoplastic elastomer (SEBS) Tuftec or S.O.E. produced by Asahi Chemical Synthetic Co., Ltd.

Furthermore, the anti-slip region 30 may be formed by laminating a film material having an anti-slip effect onto the surface of the front fabric 13 and/or the surface of the back fabric 14.

Arrangement of Anti-slip Region 30

Arrangements A to F are described here as examples of the arrangement patterns of the anti-slip region 30 provided on the front surface 11 of the top bedding 10. It is also possible that the anti-slip region 30 is provided on the back surface 12 of the top bedding 10.

In arrangement A, the anti-slip region 30 is strip-shaped in plan view. The length direction of the anti-slip region 30 is aligned with the width direction of the top bedding 10, and the anti-slip region 30 is provided at the center portion in the length direction of the top bedding 10, and on both sides in the length direction, sandwiching the center portion with intervals.

Arrangement A includes, for example, arrangement A1 shown in FIG. 1 and FIG. 2, and arrangement A2 shown in FIG. 4. In arrangement A1, the front surface 11 of the top bedding 10 has three anti-slip regions 30A to 30C (which may be simply referred to below as “the anti-slip region 30” or “the anti-slip regions 30” when no distinction is made). The anti-slip regions 30A to 30C have the same strip shape in plan view. The anti-slip region 30A is provided at the center portion in the length direction of the top bedding 10, and the anti-slip regions 30B and 30C are provided along the ends on both sides in the length direction of the top bedding 10, sandwiching the center portion. There are intervals between the adjacent anti-slip regions 30A, 30B, and 30C, and the regions between the adjacent anti-slip regions 30A, 30B, and 30C are composed of the front fabric 13 or the back fabric 14 of the top bedding 10.

The length L1 of the strip-shaped anti-slip region 30 is equal to the length L11 in the width direction of the top bedding 10. That is, the anti-slip region 30 is provided over the entire length in the width direction of the top bedding 10.

In this specification, the phrase “the anti-slip region 30 is provided over the entire length in the width direction of the top bedding 10” means not only that the anti-slip region 30 extends entirely between one end and the other end in the width direction of the top bedding 10, but also that the ends in the length direction of the anti-slip region 30 are positioned slightly inward (by a length of 10% or less of the length L11 in the width direction) from the one end and the other end in the width direction of the top bedding 10.

The width L2 of the anti-slip region 30 is set according to the percentage of the area of the anti-slip region 30 in the area of the front surface 11 or the area of the back surface 12 of the top bedding 10 described later.

FIG. 4 shows arrangement A2 as another example of arrangement A. Arrangements A2 and B to F are explained below only for the configurations different from that of arrangement A1, and the explanation is omitted for the same configuration. In arrangement A2, the anti-slip regions 30B and 30C are positioned inward in the length direction from the ends on both sides in the length direction of the top bedding 10, sandwiching the center portion. The intervals between the ends in the length direction of the top bedding 10 and the anti-slip regions 30B and 30C are each preferably 3% or less of the length L12 in the length direction of the top bedding 10; in this embodiment, the interval is set to 4.2 cm, i.e., 2%.

FIG. 5 shows an example of arrangement B. In arrangement B, the anti-slip regions 30A to 30C are each strip-shaped in plan view and are provided along the length direction of the top bedding 10 at the center portion in the width direction of the top bedding 10 and on both sides in the width direction, sandwiching the center portion with intervals.

More specifically, in arrangement B shown in FIG. 5, the anti-slip region 30A is provided at the center portion in the width direction of the top bedding 10, and the anti-slip regions 30B and 30C are provided along the ends on both sides in the width direction of the top bedding 10, sandwiching the center portion. The length L1 of the strip-shaped anti-slip region 30 is equal to the length L12 in the length direction of the top bedding 10. That is, the anti-slip region 30 is provided over the entire length in the length direction of the top bedding 10.

The phrase “the anti-slip region 30 is provided over the entire length in the length direction of the top bedding 10” means not only that the anti-slip region 30 extends entirely between one end and the other end in the length direction of the top bedding 10, but also that the ends in the length direction of the anti-slip region 30 are positioned slightly inward (by a length of 10% or less of the length L12 in the length direction) from the one end and the other end in the length direction of the top bedding 10.

In arrangements A1 and A2, and arrangement B, three anti-slip regions 30A to 30C are provided. However, it is also possible to further provide one or more anti-slip regions 30 between the anti-slip regions 30A and 30B, and between the anti-slip regions 30A and 30C.

FIG. 6 shows an example of arrangement C. In arrangement C, the anti-slip regions 30B and 30C are strip-shaped in plan view, and those two anti-slip regions are provided along the width direction of the top bedding 10 on both sides in the length direction of the top bedding. That is, arrangement C is equal to arrangement Al in which the anti-slip region 30A is not provided.

FIG. 7 shows an example of arrangement D. In arrangement D, the anti-slip regions 30B and 30C are strip-shaped in plan view, and those two anti-slip regions are provided along the length direction of the top bedding 10 on both sides in the width direction of the top bedding 10. That is, arrangement D is equal to arrangement B in which the anti-slip region 30A is not provided.

As shown in FIG. 8, in arrangement E, the anti-slip region 30 is strip-shaped in plan view and is provided annularly along the peripheral edge portions of the top bedding 10 (the end portions in the width direction and the length direction).

As shown in FIG. 9, in arrangement F, the anti-slip region 30 is rectangular in plan view and is provided at least at the center portion of the top bedding 10. In the example shown in FIG. 9, the anti-slip region 30 is provided over the entire surface of the top bedding 10.

In FIG. 9, the anti-slip region 30 is provided over the entire front surface 11 of the top bedding 10; however, it is also possible that the anti-slip region 30 has a shape that is similar to that of the front surface 11 or the back surface 12 of the top bedding 10 and that is smaller than that of the top bedding 10. In this case, the anti-slip region 30 is provided at the center portion of the top bedding 10, and the front fabric 13 or the back fabric 14 is exposed around the anti-slip region 30.

The anti-slip region 30 is provided on at least one of the front surface 11 and the back surface 12 of the top bedding 10, based on any one of the above arrangements A to F. That is, the anti-slip region 30 may be provided on either the front surface 11 or the back surface 12 of the top bedding 10, or may be provided on both the front surface 11 and the back surface 12 of the top bedding 10. When the anti-slip region 30 is provided on both surfaces, the arrangement patterns may be different between the front surface 11 and the back surface 12.

When the anti-slip region 30 is provided on both the front surface 11 and the back surface 12 of the top bedding 10, particularly preferred combinations of the arrangement patterns are as follows.

Combination 1: front surface 11: arrangement A1, back surface 12: arrangement A2

Combination 2: front surface 11: arrangement A1, back surface 12: arrangement B

Combination 3: front surface 11: arrangement A1, back surface 12: arrangement F

Combination 4: front surface 11: arrangement B, back surface 12: arrangement F

Percentage of Anti-slip Region 30

When the anti-slip region 30 is provided on either the front surface 11 or the back surface 12 of the top bedding 10, the area of the anti-slip region 30 is set to account for 40% or more and 100% or less, and preferably 60% or more and 100% or less, of the area of the front surface 11 or the back surface 12 on which the anti-slip region 30 is provided. The area of the anti-slip region 30 is set to account for 20% or more and 100% or less, and preferably 30% or more and 100% or less, of the total area of the area (surface area) of the front surface 11 and the area (surface area) of the back surface 12.

For example, when the anti-slip region 30 is provided only on the front surface 11 of the top bedding 10, the length L12 in the length direction of the top bedding 10 is 210 cm, the arrangement of the anti-slip region 30 is based on arrangement A1 shown in FIG. 2, and the width L2 of the anti-slip region 30 is 29 cm, the area of the anti-slip region 30 accounts for 41.4% of the area of the front surface 11 of the top bedding 10, and the area of the anti-slip region 30 accounts for 20.7% of the total area of the area (surface area) of the front surface 11 and the area (surface area) of the back surface 12.

When the anti-slip region 30 is provided on both the front surface 11 and the back surface 12 of the top bedding 10, the area of the anti-slip region 30 is set to account for 20% or more and 100% or less, and preferably 40% or more and 60% or less, of the total area of the area (surface area) of the front surface 11 and the area (surface area) of the back surface 12. The area of the anti-slip region 30 is set to account for 20% or more and 100% or less, and preferably 40% or more and 100% or less, of the area of at least one of the front surface 11 and the back surface 12. Alternatively, the percentages of the area of the anti-slip region 30 in the area of the front surface 11 and in the area of the back surface 12 may both be set as described above.

For example, when the anti-slip region 30 is provided on both the front surface 11 and the back surface 12 of the top bedding 10, the length L12 in the length direction of the top bedding 10 is 210 cm, the arrangement of the anti-slip region 30 is based on arrangement A1 shown in FIG. 2 for both the front surface 11 and the back surface 12, and the width L2 of the anti-slip region 30 is 29 cm, the area of the anti-slip region 30 provided on the front surface 11 or the back surface 12 accounts for 41.4% of the area of the front surface 11 or the back surface 12 of the top bedding 10, and, of course, the area of the anti-slip region 30 provided on the front surface 11 and the back surface 12 accounts for 41.4% of the total area of the area (surface area) of the front surface 11 and the area (surface area) of the back surface 12.

Use of Top Bedding 10

The top bedding 10 is used by placing it inside the bedding cover 100 (FIG. 3). In this embodiment, the top bedding 10 is a comforter, and the bedding cover 100 is a comforter cover. The bedding cover 100 is a known bedding cover formed by sewing together the peripheries of a first fabric 103 and a second fabric 104 into a bag shape. By placing the top bedding 10 according to this embodiment in the bedding cover 100, the anti-slip region 30 is brought into contact with the inner surfaces 101 and 102 of the first fabric 103 and the second fabric 104 of the bedding cover 100, generating frictional force between the inner surfaces 101 and 102 of the bedding cover 100 and the anti-slip region 30. Therefore, when the top bedding 10 that is contained in the bedding cover 100 is used, displacement of the top bedding 10 within the bedding cover 100 can be avoided.

In a state in which the top bedding 10 is contained in the bedding cover 100, a measurement point arbitrarily placed on the front surface 11 or the back surface 12 of the top bedding 10 on which the anti-slip region 30 is provided is defined as point a; a measurement point that faces point a on the surface of the bedding cover 100 is defined as point b; and the distance between points a and b in plan view is defined as distance L. At this time, the amount of displacement of the top bedding 10 with respect to the bedding cover 100 is calculated from the difference between the distance L in the top bedding 10 before use and the distance L in the top bedding 10 after use. The amount of displacement is preferably 2.0 cm or less, more preferably 1.6 cm or less, and even more preferably 0.8 cm or less. When multiple pairs of measurement points (point a, point b) are provided, the amount of displacement may be determined as the average value of the measurement values of the pairs of measurement points. When one pair of measurement points is used, the measurement may be performed multiple times to obtain the average value of the measurement values.

Second Embodiment

FIGS. 10 to 12 show a bedding cover 20 according to a second embodiment of the present invention. The bedding cover 20 is configured to contain a bedding 110 inside. FIG. 10 is a perspective view of the bedding cover 20 according to one embodiment of the present invention, and FIG. 11 is a plan view of the bedding cover 20. FIG. 12 is a cross-sectional view of the bedding cover 20 in which the bedding 110 is contained.

The bedding 110 may be a comforter, a futon, a pillow, a blanket, or the like, and the bedding cover 20 may be a comforter cover, a futon cover, a pillow cover, a blanket cover, or the like. The bedding cover 20 is rectangular. Below, the bedding cover 20 is described using, as an example, a comforter cover that contains a bedding 110 that is a single-size comforter. The bedding cover 20 is of a single size having a length L21 in the width direction of 150 cm and a length L22 in the length direction of 215 cm.

The size of the bedding cover 20 according to this embodiment is not limited to a single size and may be any size. For example, the length L21 in the width direction may be 170 cm for a semi-double size, 190 cm for a double size, 210 cm for a queen size, or 230 cm for a king size. In any size, the length L22 in the length direction is usually 210 cm but may be set to any length.

As shown in FIG. 10, the bedding cover 20 is formed by sewing together the peripheral edges of a rectangular first fabric 23 and second fabric 24 into a bag shape, leaving an opening 25 for inserting and removing the bedding 110. The bedding 110 is to be contained inside.

The bedding cover 20 has a first inner surface 21 that faces the front surface of the bedding 110 and a second inner surface 22 that faces the back surface of the bedding 110. The first inner surface 21 and the second inner surface 22 are the surfaces that are exposed when the bedding cover 20 is turned inside out. At least one of the first inner surface 21 and the second inner surface 22 has at least one anti-slip region 30. The details of the anti-slip region 30 are the same as those described in the first embodiment, and therefore the description is omitted.

The arrangement patterns of the anti-slip region 30 on the first inner surface 21 and the second inner surface 22 are the same arrangements A to F as described in the first embodiment, and therefore the description of arrangements A to F is omitted. Specifically, based on arrangements A to F described in the first embodiment, the anti-slip region 30 is provided on at least one of the first inner surface 21 and the second inner surface 22 of the bedding cover 20 instead of on the front surface 11 of the top bedding 10.

In the examples shown in FIGS. 10 to 12, the anti-slip regions 30 are provided on the first inner surface 21 based on arrangement A; however, the arrangement pattern may also be any one of arrangements B to F.

The anti-slip region 30 is provided on at least one of the first inner surface 21 and the second inner surface 22 based on any one of arrangements A to F. That is, the anti-slip region 30 may be provided on either the first inner surface 21 or the second inner surface 22, or may be provided on both the first inner surface 21 and the second inner surface 22. When the anti- slip region 30 is provided on both the first inner surface 21 and the second inner surface 22, the arrangement patterns may be different between the first inner surface 21 and the second inner surface 22.

The combinations of the arrangement patterns when the anti-slip region 30 is provided on both the first inner surface 21 and the second inner surface 22 are the same as combinations 1 to 5, which are applied when the anti-slip region 30 is provided on both the front surface 11 and the back surface 12 of the top bedding 10 according to the first embodiment, and therefore, the description is omitted.

Percentage of Anti-slip Region 30

When the anti-slip region 30 is provided on either the first inner surface 21 or the second inner surface 22 of the bedding cover 20, the area of the anti-slip region 30 is set to account for 40% or more and 100% or less, and preferably 60% or more and 100% or less, of the area of the first inner surface 21 or the area of the second inner surface 22 on which the anti-slip region 30 is provided. The area of the anti-slip region 30 is set to account for 20% or more and 100% or less, and preferably 40% or more and 100% or less, of the total area of the area (surface area) of the first inner surface 21 and the area (surface area) of the second inner surface 22.

When the anti-slip region 30 is provided on both the first inner surface 21 and the second inner surface 22 of the bedding cover 20, the area of the anti-slip region 30 is set to account for 20% or more and 100% or less, and preferably 40% or more and 60% or less, of the total area of the area (surface area) of the first inner surface 21 and the area (surface area) of the second inner surface 22. The area of the anti-slip region 30 is set to account for 20% or more and 100% or less, and preferably 40% or more and 100% or less, of the area of at least one of the first inner surface 21 and the second inner surface 22. Alternatively, the percentages of the area of the anti-slip region 30 in the area of the first inner surface 21 and in the area of the second inner surface 22 may both be set as described above.

Use of Bedding Cover 20

The bedding cover 20 according to this embodiment is used by placing a bedding inside. The bedding 110 may be, for example, a known comforter formed by sewing together the peripheries of a front fabric and a back and filling a filling material inside. By placing the bedding 110 in the bedding cover 20 according to this embodiment, the anti-slip region 30 is brought into contact with a front surface 111 or a back surface 112 of the bedding 110, generating frictional force between the front surface 111 or the back surface 112 of the bedding 110 and the anti-slip region 30. Therefore, when the bedding 110 that is contained in the bedding cover 20 is used, displacement of the bedding 110 within the bedding cover 20 can be avoided.

In a state in which the bedding 110 is contained in the bedding cover 20, a measurement point arbitrarily placed on the first inner surface 21 or the second inner surface 22 of the bedding cover 20 on which the anti-slip region 30 is provided is defined as point a; a measurement point that faces point a on the surface of the bedding 110 is defined as point b; and the distance between points a and b in plan view is defined as distance L. At this time, the amount of displacement of the bedding cover 20 with respect to the bedding 110 is calculated from the difference between the distance L in the bedding cover 20 before use and the distance L in the bedding cover 20 after use. The amount of displacement is preferably 2.0 cm or less, more preferably 1.6 cm or less, and even more preferably 0.8 cm or less. When multiple pairs of measurement points (point a, point b) are provided, the amount of displacement may be determined as the average value of the measurement values of the pairs of measurement points. When one pair of measurement points is used, the measurement may be performed multiple times to obtain the average value of the measurement values.

Evaluation Test 1

Anti-slip fabrics of Example 1, Example 2, and Comparative Example 1 were prepared as the anti-slip region 30 for use in the top bedding 10 and the bedding cover 20 of the present invention, and the kinetic coefficient of friction and the static coefficient of friction of the anti-slip fabrics were measured.

Example 1

• • Fabric: Tricot knit fabric
  • Basis Weight: 79 gsm
  • Yarn composition: 61% polyester, 39% spandex (polyurethane elastic fiber)

Example 2

• • Fabric: Brushed suede
  • Basis weight: 120 gsm
  • Yarn composition: 100% polyester

Comparative Example 1

• • Fabric: Cotton blend woven fabric
  • Basis weight: 100 gsm
  • Yarn composition: 15% cotton, 85% polyester

The coefficients of friction of Examples 1 and 2, and Comparative Example 1 (also referred to below as “the samples”) were measured as described here. The measurement was performed in an environment of a temperature of 20° C. and a humidity of 65% RH using the measurement system 200 shown in FIG. 13. A stainless steel plate 204 was placed on a support table 205 having a horizontal surface, and the four corners were fixed with tape. Next, a sample 201 with a size of 7 cm×7 cm was placed on the stainless steel plate 204, and a slider 202 having a weight of 200 g was placed on the sample 201. Then, a load (weight) 203 having a weight of 500 g was placed on the slider 202. Next, the static coefficient of friction and the kinetic coefficient of friction were measured when the slider 202 was pulled at a speed of 100 mm/min with a tensile tester (not shown).

The results are shown in Table 1. The results revealed that the static coefficients of friction and kinetic coefficients of friction of Examples 1 and 2 were higher than those of Comparative Example 1, and were 0.8 or higher.

	TABLE 1
			Comparative
	Example 1	Example 2	Example 1

	Static coefficient	0.91	0.87	0.15
	of friction
	Dynamic coefficient	0.80	0.81	0.13
	of friction

Evaluation Test 2

Displacement between the bedding cover 100 and the top bedding 10 was evaluated. As the top bedding 10 of the present invention, comforters were produced in Examples 3 to 7 and Comparative Example 2. The comforters of Examples 3 to 7 and Comparative Example 2 are as described below.

Example 3

• • Arrangement of the anti-slip region 30: the front surface 11 only
  • Arrangement pattern of the anti-slip region 30: arrangement F shown in FIG. 9 (providing the anti-slip region 30 on the entire surface)

Example 4

• • Arrangement of the anti-slip region 30: the front surface 11 only
  • Arrangement pattern of the anti-slip region 30: arrangement A1 shown in FIG. 1 (providing three anti-slip regions 30)
  • Width L2 of the anti-slip region 30: 29 cm

Example 5

• • Arrangement of the anti-slip region 30: the front surface 11 only
  • Arrangement pattern of the anti-slip region 30: arrangement A1 shown in FIG. 1 (providing three anti-slip regions 30)
  • Width L2 of the anti-slip region 30: 34 cm

Example 6

• • Arrangement of the anti-slip region 30: the front surface 11 only
  • Arrangement pattern of the anti-slip region 30: arrangement A1 shown in FIG. 1 (providing three anti-slip regions 30)
  • Width L2 of the anti-slip region 30:42 cm

Example 7

• • Arrangement of the anti-slip region 30: both surfaces of the front surface 11 and the back surface 12
  • Arrangement pattern of the anti-slip region 30 on the front surface 11: arrangement F shown in FIG. 9 (providing the anti-slip region 30 on the entire surface)
  • Arrangement pattern of the anti-slip region 30 on the back surface 12: arrangement A1 shown in FIG. 1 (providing three anti-slip regions 30)
  • Width L2 of the anti-slip region 30 on the back surface 12:29 cm

Shared Matter in Examples 3 to 7 and Comparative Example 2

• • Top bedding 10 (comforter) size: a single size (150 cm×210 cm)
  • Bedding cover 100 (comforter cover) size: a single size (150 cm×210 cm) (a known cover)
  • First fabric 103 and second fabric 104 of the bedding cover 100 (comforter cover): 100% cotton
  • Anti-slip region 30 (Examples 3 to 7 only): the same anti-slip fabric as that used in Example 1

Measurement Method for Displacement

Displacement between the bedding cover 100 and the top bedding 10 was measured as follows. First, as shown in FIG. 14 (A), markers a1 to a4 were placed at the four corners of the front surface 11 of the top bedding 10. Additionally, markers a5 and a6 were placed at the center portions in the width direction at both ends in the length direction, while markers a7 and a8 were placed at the center portions in the length direction at both ends in the width direction.

FIG. 14 (B) shows an inner surface 101 of the bedding cover 100. The inner surface 101 faces the front surface 11 of the top bedding 10 when the top bedding 10 is contained in the bedding cover 100. FIG. 14 (B) is a view of the inner surface 101 observed from the top bedding 10 side. Markers b1 to b4 were placed at the four corners so that they were substantially facing markers a1 to a4, respectively. Additionally, markers b5 and b6 were placed at the center portions in the width direction at both ends in the length direction of the inner surface 101, while markers b7 and b8 were placed at the center portions in the length direction at both ends in the width direction.

The top beddings 10 of Examples 3 to 7 and Comparative Example 2 were each placed in the bedding cover 100. In this state, the top bedding 10 contained in the bedding cover 100 was spread out on a flat table, and the distances between markers a1 to a8 of the top bedding 10 and markers b1 to b8 of the bedding cover 100, which were located at positions corresponding to respective markers a1 to a8 in plan view, were measured. Specifically, the top bedding 10 was viewed from above, and the distance between markers a1 and b1, the distance between markers a2 and b2, etc., were each measured (pre-tumbling measurement).

Next, each of the samples was folded in quarters and placed in a tumble dryer, and the tumble dryer was operated for 3 minutes (this process is also referred to below as “the tumbling”). A tumble dryer is a dryer that dries a sample by rotating the sample while applying heat. After the operation, in the same manner as in the pre-tumbling measurement, the distances between markers a1 to a8 of the top bedding 10 and respective markers b1 to b8 of the bedding cover 100 were measured (post-tumbling measurement).

Next, the differences between before and after the tumbling, in terms of the distances between markers a1 to a8 and respective markers b1 to b8, were calculated for each pair of markers. The differences were defined as the amounts of displacement (calculation of displacement).

The average value of the distances between markers a1 to a8 and respective markers b1 to b8 in the pre-tumbling measurement was calculated. Further, the average value of the distances between markers a1 to a8 and respective markers b1 to b8 in the post-tumbling measurement was calculated.

Additionally, the average value of the amounts of displacement obtained by calculation of displacement between markers a1 to a8 and respective markers b1 to b8 was calculated.

A series of the steps, i.e., the pre-tumbling measurement, the post-tumbling measurement, and the calculation of displacement, was performed three times. Each time, the average values before and after the tumbling test, and the average value of the calculation of displacement were calculated as described above. Then, the average of the three-time measurements was calculated for each value. The results are shown in Table 2.

The amount of displacement in Comparative Example 2 was 9 cm or more in view of the measurements before and after the tumbling. However, the amounts of displacement in Examples 3 to 7, including Example 4, in which the amount of displacement was largest among the Examples, i.e., 2 cm, were smaller than that of Comparative Example 2.

	TABLE 2
						Comparative
	Example 3	Example 4	Example 5	Example 6	Example 7	Example 2

Percentage of the anti-slip fabric	50	20.7	24.3	30	70.7	0
in the total area of the front
surface and back surface (%)
Pre-tumbling measurement (cm)	2.1	2.3	2.3	2.1	2.7	3.8
Post-tumbling measurement (cm)	2.7	4.2	3.9	2.9	3.	13.1
Amount of displacement (cm)	0.6	2.0	1.6	0.8	0.4	9.2

Evaluation Test 3

In Example 8 and Comparative Example 3, top beddings 10 (comforters) were produced using anti-slip fabrics with different coefficients of friction, and the amounts of displacement were measured.

• • The anti-slip region 30 is as follows.
  • Example 8: The same anti-slip fabric as that used in Example 1 (static coefficient of friction: 0.91, kinetic coefficient of friction: 0.80)
  • Comparative Example 3: A two-layer knitted fabric composed of 46% modal, 9% polyurethane, and 45% polyester (static coefficient of friction: 0.61, kinetic coefficient of friction: 0.67)

Shared Matter in Example 8 and Comparative Example 3

• • Top bedding 10 (comforter) size: a single size (150 cm×210 cm)
  • Bedding cover 100 (comforter cover) size: a single size (150 cm×210 cm) (a known cover)
  • First fabric 103 and second fabric 104 of the bedding cover 100 (comforter cover): 100% cotton
  • Arrangement of the anti-slip region 30: the front surface 11 only
  • Arrangement pattern of the anti-slip region 30: arrangement A1 shown in FIG. 1 (providing three anti-slip regions 30)
  • Width L2 of the anti-slip region 30:42 cm

In Example 8 and Comparative Example 3, the series of the steps, i.e., the pre-tumbling measurement, the post-tumbling measurement, and the calculation of displacement, was performed three times, as in the measurement method for displacement described above. Each time, the average values before and after the tumbling test, and the average value of the calculation of displacement were calculated as described above. Then, the average of the three-time measurements was calculated for each value. The results are shown in Table 3.

	TABLE 3
		Comparative
	Example 8	Example 3

	Static coefficient	0.91	0.61
	of friction
	Dynamic coefficient	0.80	0.67
	of friction
	Pre-tumbling	2.1	2.8
	measurement (cm)
	Post-tumbling	2.9	7
	measurement (cm)
	Amount of	0.8	4.2
	displacement (cm)

The amount of displacement (average value) in Example 8 was 0.8 cm, while the amount of displacement (average value) in Comparative Example 3 was 4.2 cm. In Example 8, in which the coefficient of friction was 0.8 or more, the amount of displacement was confirmed to be reduced.

The dimensions, materials, shapes, relative positions, etc. of the elements described as an embodiment or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the invention. Expressions indicating things being in an equivalent state, such as “in a predetermined direction,” “along a predetermined direction,” “same,” “identical,” “equal,” and “homogeneous,” not only indicate a state of strict equality, but also indicate a state with a tolerance or a difference to the extent that the same functions can be achieved. Expressions describing shapes such as triangular, rectangular, and circular describe not only shapes in the strict geometric sense, but also shapes that include uneven portions, chamfers, etc. to the extent that the same effect can be achieved. Expressions such as “having,” “consisting of,” “comprising,” “including,” or “containing” one element are not exclusive expressions, and do not exclude the presence of other elements. “Parallel” and “orthogonal” mean being essentially parallel or orthogonal, and include not only a strictly parallel or orthogonal state but also a state with an error of a few degrees. Further, for example, expressions such as “end portion,” which includes the term “portion” at the end, may be used. For example, the term “end portion” means a portion with a specific range that includes an “end.” The same applies to other expressions with “portion” at the end of the term.

DESCRIPTION OF REFERENCE NUMERALS

• • 10. Top bedding
  • 11. Front surface
  • 12. Back surface
  • 13. Front fabric
  • 14. Back fabric
  • 20. Bedding cover
  • 21. First inner surface
  • 22. Second inner surface
  • 23. First fabric
  • 24. Second fabric
  • 30. (30A to 30C) Anti-slip region