CLOSURE CAP

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase entry under 37 U.S.C. §371 of PCT/EP2023/050475 filed Jan. 10, 2023, which claims priority to Swiss Patent Application No. 000048/2022 filed Jan. 14, 2022, the entirety of each of which is incorporated by this reference.

FIELD OF THE INVENTION

The invention relates to a closure cap and to a container having a closure cap.

PRIOR ART

Closure caps which are captively held on the container and close the pour opening thereof are known from the prior art in the field of plastic closure caps having a security strip. The holding function is also of great importance, since legal regulations will be enacted in the next few years under which closures of beverage bottles must be connected captively to the beverage bottle even when in the open state.

Closure caps which have two holding strips, which connect a threaded part of the closure cap to a security ring of the closure cap, are also known. The two holding strips can act as a hinge about which the threaded part can be folded away from the security ring or from the container to be closed off from a closure position into an open position. A latching lug is formed on the open edge of the threaded part. With the latching lug, the threaded part can be latched in the open position on the external thread of the bottle neck. The threaded part is thereby fixed in the open position and does not interfere with the pouring process. However, the latching lug inevitably projects into the security ring, as a result of which a recess for the latching lug has to be provided in the security ring. This recess inevitably weakens the security ring. Due to the recess, the security ring is less dimensionally stable and has a risk of being pulled off the bottle neck when the threaded part is unscrewed. As a result, the securing function and the holding function of the closure cap are not reliable-particularly in the case of security rings with large diameters.

Advantages of the Invention

The disadvantages of the described prior art result in creating an improved captive closure cap in which the removal of the security ring is reliably prevented when the threaded part is unscrewed.

DESCRIPTION

The advantages are achieved with a closure cap for closing the pour opening of a container via the features given in the independent claims. Developments and/or advantageous alternative embodiments form the subject-matter of the dependent claims.

The invention is comprises a web section that has a greater thickness than the remaining security ring, a first or second latching lug protrudes at the open edge adjacent to the first or third end, and a gap is formed between the first and second latching lugs, and a holding web is formed on the web section and projects into the gap in the closure position. These features ensure that the security ring receives sufficient stability in order to not be deformed unintentionally during unscrewing and thereby pulled off the spout. The holding web centers the security ring on the spout and thereby also prevents the security ring from being pulled off the spout.

In the open position, the threaded part can be latched to the two latching lugs on the external thread of the spout. As a result, the threaded part is held in the open position doubly and accordingly stably on the spout, does not rotate unintentionally relative to the spout, and consequently does not interfere with the pouring of filling material.

It has proven expedient if a radially outwardly protruding first or second step is present at the open end of the first or second retaining lug. The steps improve the latching on the external thread, since they increase the latching surface on the external thread.

At the web section, a first and a second depression are expediently provided into which the first and the second latching lugs project in the closure position and between which the holding web rises. By providing the depressions, the height of the security ring is reduced, which saves upon material and makes it possible for the closure cap to fit a standardized spout.

The invention also provides that the first and third ends are articulated to the open edge by a first and a second hinge. The hinges enable the threaded part to be pivoted relative to the first and second holding strips about the hinges into the open position, whereby the transfer into the open position is simple and self-explanatory for the user. As a result, an inadvertent tearing of the threaded part from the security ring can also be avoided.

Expediently, the first edge is connected to the open edge of the threaded part by at least one first predetermined breaking web, and the second edge is releasably connected to the security ring by at least one second predetermined breaking web. The third edge can also be releasably connected to the open edge of the threaded part by at least one third predetermined breaking web, and the fourth edge is releasably connected to the security ring by at least one fourth predetermined breaking web. As a result, the holding strips receive effective support in the axial direction, which is required for the closure cap to be pushed onto the spout without the holding strips being compressed or destroyed.

The first and third ends may be connected to the security ring by a second or a fourth predetermined breaking web. The holding web may also be releasably connected to the open edge by a fifth predetermined breaking web. By providing the two fourth predetermined breaking webs and the fifth predetermined breaking web, the holding strips and the holding web are sufficiently supported and held in order to prevent damage in case of impact to the spout. Further third and fourth predetermined breaking webs can therefore be dispensed with, whereby plastics material can be saved.

In a particularly embodiment of the invention, the thickness of the web section has 1.5 times to 2 times the thickness of the remaining security ring. This dimensioning of the thickness ensures that the web section has sufficient stability so that the security ring is not pulled off the spout when the threaded part is unscrewed, even if the security ring has a large diameter of up to 40 mm.

The transition from the web section and to the remaining security ring is, expediently, continuous. A weakening of the security ring is thereby reliably prevented, and a risk of injury of users is avoided.

It has proven to be advantageous if the first and second lugs have a height of between 4 and 10 mm or between 5 and 7 mm. As a result, the threaded part can be latched in the open position with the aid of the lugs without wobble and in a defined manner on the external thread without the lugs being bent or too short for latching.

Advantageously, the first and second steps have a height between 1 and 3 mm or between 1.5 and 2.5 mm. The steps improve the latching of the threaded part on the external thread. In addition, at this claimed height, there is no risk of injury from the steps, since they only project slightly beyond the threaded part in the closure position.

It is also advantageous if the first and third ends enclose a first opening angle of at least 25 degrees and at most 50 degrees, or of at least 35 and at most 45 degrees, with respect to the center point of the closure cap as the apex, and that the second and fourth ends enclose a second opening angle of at least 180 degrees and at most 220 degrees, or of at least 190 and at most 210 degrees, with respect to the center point of the closure cap as the apex. By selecting these angle sizes, the first and second holding strips are arranged on the security ring in a position in which they extend substantially tangentially along the spout when the threaded part is in the open position. As a result, the holding strips move with the threaded part without catching on the spout when the threaded part is moved into the open position.

Advantageously, the opening angle which the web section encloses with the center point as the apex corresponds substantially to the first opening angle. The web section is preferably formed by cutting out the first and second holding strips from the security ring. It would also be conceivable for a greater distance between the first end of the first holding strip and the web section or the third end of the second holding strip and the web section to be provided than if the distance were formed by cutting out the holding strips.

The first and second ends may enclose a third opening angle of at least 40 degrees and at most 70 degrees, or of at least 50 and at most 60 degrees, with respect to the center point of the closure cap as the apex.

It is also provided that the third and fourth ends may enclose a fourth opening angle of at least 40 degrees and at most 70 degrees, or of at least 50 and at most 60 degrees, with respect to the center point of the closure cap as the apex. With this selection of the third and fourth opening angles, the first and second holding strips have a length which allows unscrewing, transferring the threaded part into the open position, and holding the threaded part in the open position. In combination with the first and second opening angles, the holding strips are given the appropriate position on the security ring in order to allow the above movements of the threaded part.

Expediently, the third and fourth opening angles are of equal size, as a result of which the first and second holding strips are of equal length. The threaded part is thereby held in the open position with uniform tension.

Since the first, second, third, and fourth opening angles have a center point of a circle as apex, their angle sum must be 360 degrees.

In another embodiment of the invention, the length of the first and second holding strips is dimensioned in such a way that they are tensioned in the open position, and the threaded part is held in the open position. The holding strips may be elastically tensioned, as a result of which the threaded part can be moved multiple times between the closure position and the open position. The tension of the holding strips allows the threaded part to be held wobble-free in the open position.

A first and a second recess for receiving the first and second holding strips are expediently provided on the edge of the security ring facing towards the first and second holding strips. As a result, the first and second holding strips can be molded from the security ring in a space-saving manner and without additional material expenditure. For example, the first and second holding strips can be cut out of the security ring or molded during the production process of the closure cap.

It has proven to be expedient if an inwardly projecting inner cone, e.g., in the form of a sealing cylinder or a sealing ring, is formed on the base of the threaded part, and is designed to interact in a sealing manner with the inner wall of the spout in the closure position. The closure cap can therefore act as a so-called cone sealer and reliably seals the spout.

In a further embodiment of the invention, the first and the second holding strips have a width of between 3 mm and 7 mm, or a width of between 4 mm and 5 mm. This dimensioning has the effect that the holding strip is not unintentionally torn off—in particular, when the predetermined breaking webs are torn off. Furthermore, the closure cap does not become too high and can be joined in a sealed manner with standardized container necks having an outer thread.

The invention is also characterized in that the closure cap is designed to interact with a standardized spout with an outer thread and annular protrusion. The closure cap can therefore be placed on standardized container necks, in particular PET beverage bottles. Containers that are joined to the closure cap according to the invention therefore do not have to be specifically adapted to the closure cap.

The closure cap is expediently made of a plastics material, such as HDPE (high-density polyethylene) or PP (polypropylene). The closure cap can therefore be produced with standard plastics materials from which known closure caps with a security ring are also produced.

In a further embodiment of the invention, the threaded part, the security ring, the holding strip, and the at least one first and second predetermined breaking element are produced in one piece. As a result, the closure cap can be produced in an injection mold, without the need of further processing steps, to form the first and second holding strips. The inner cone may also be produced in one piece together with the other parts of the closure cap.

In a particular embodiment of the invention, the security ring has slots, arranged distributed over the circumference, with an upper edge and a lower edge, wherein the upper edge is formed by a circular-arc-shaped section of the security ring, and the lower edge is formed by a wall section inclined inwardly in the radial direction, and the lower edge of each slot forms the protrusions, whereby engaging means for form-fitting engagement with the annular protrusion are formed. Since the engagement means in the form of the inward inclined wall sections are not on the entire circumference of the security ring, and since slots are also present, by the molding of which the amount of material used is even further reduced, the material requirement of plastics can be significantly reduced by up to 5%. In addition, the wall section is immovable inwards in the radial direction, whereby the security ring is held on the annular protrusion and cannot be pulled over it until the security ring is stretched along its circumference. The security ring is rigidly held on the annular protrusion by the wall sections such that the predetermined breaking elements safely tear before the holding of the wall sections is overcome. However, the wall sections are flexible or movable outward in the radial direction. As a result, the wall sections can be demolded from the injection mold or the injection-molding tool with little exertion of force. For the same reason, the application force for pressing the closure cap is significantly reduced in comparison to the prior art. Expansion of the security ring, which can lead to permanent damage to the closure cap, is largely prevented during demolding and pressing.

A further aspect of the invention relates to a container having a container body, a spout adjoining the container body, an outer thread formed on the spout, and a closure cap in accordance with the above description.

In another embodiment of the invention, the first and second latching lugs latch in the open position on the external thread. As a result, the threaded part, as already explained further above, is held stable in the open position, and the closure cap cannot rotate independently around the spout in the open position.

In a first embodiment, the container body and the spout are made in one piece from a plastics material, whereby the closure cap can be used for a commercially available plastic bottle—for example, a PET bottle with support ring.

In a second embodiment, the container is a composite beverage cardboard, wherein the container body is a plastic-laminated cardboard, and the spout, made of plastics, is connected to the container body by a non-detachable connection. The closure cap is thereby also suitably combined with composite beverage cartons.

Further advantages and features will become apparent from the following description of an embodiment of the invention with reference to the schematic drawings. In the figures, in a representation that is not to scale:

FIG. 1: shows a perspectival view of a closure cap obliquely from above in the closure position;

FIG. 2: shows a side view of the closure cap;

FIG. 3: shows a detailed side view of the closure cap;

FIG. 4: shows a side view of the security ring, mounted on a container spout,

FIG. 5: shows a perspectival view of the closure cap obliquely from below;

FIG. 6: shows a further perspectival view of the closure cap obliquely from below;

FIG. 7: shows a bottom view of the closure cap;

FIG. 8: shows a perspectival view of the closure cap in the open position;

FIG. 9: shows a detail view of the security ring in a further embodiment; and

FIG. 10: shows a sectional view of the security ring of FIG. 9 with visualized inclination angles.

FIG. 1 through 8 show a closure cap which is denoted as a whole by reference sign 11. The closure cap 11 is held captive on a container 13—for example, on a composite beverage box or a PET bottle. The container 13 is indicated in FIG. 4. The closure cap 11 comprises a cylindrical threaded part 15, a security ring 17, and a first and a second holding strip 19a, 19b. The first and second holding strips 19a, 19b are circular and formed from the security ring 17.

The threaded part 15 comprises a bottom 21 and a first cylindrical casing 23 having an open edge 25. An internal thread 27 is formed on the inside of the casing 23. The container 13 comprises a container body 28 and a spout 29 adjoining the container body 28. The spout 29 is designed as a second cylindrical casing. An external thread 31 is formed on the spout 29 and interacts with the internal thread 27. As a result, the threaded part 15 can be screwed onto and unscrewed from the spout 29. The closure cap 11 closes the pour opening 33, which is provided within the spout 29 and is delimited by it.

The security ring 17 is held in a form fit on the spout 13. For this purpose, an annular projection 35 is formed on the outside of the spout 29 and may be engaged from below by protrusions 37 formed on the inside of the security ring 17 (FIGS. 9 and 10). The security ring 17 is rotatable relative to the spout 29.

The first holding strip 19a has a first end 39 and a second end 41. The first end 39 is fixedly connected to the open edge 25. The second end 41 is fixedly connected to the security ring 17. As a result, the closure cap 11 is captively held on the container 13. Furthermore, the first holding strip 19a has a first edge 43 and a second edge 45. The first edge 43 is connected to the open edge 25 by at least one first predetermined breaking web 47, and the second edge 45 is releasably connected to the security ring 17 by at least one second predetermined breaking web 49.

The second holding strip 19b has a third end 51 and a fourth end 53. The third end 51 is rigidly connected to the open edge 25. The fourth end 53 is fixedly connected to the security ring 17. As a result, the closure cap 11 is additionally captively held on the container 13. Furthermore, the second holding strip 19b has a third edge 55 and a fourth edge 57. The third edge 55 is connected to the open edge 25 by at least one third predetermined breaking web 59, and the fourth edge 57 is releasably connected to the security ring 17 by at least one fourth predetermined breaking web 61.

In addition, the security ring 17 is held at the open edge 25 by a plurality of security webs 63. The security webs may be arranged at regular intervals on the security ring 17. It goes without saying that the regions occupied by the first and second holding strips 19a, 19b on the security ring 17 are free of security webs 63.

The first and second holding strips 19a, 19b may have a width between 4 mm and 5 mm so that they are sufficiently stable.

According to FIG. 1 or 2, the threaded part 15 is in a closure position in which it is pressed or screwed onto the spout 29. During unscrewing from the spout 29, the first and second holding strips 19a, 19b are pulled upwards in the axial direction and are also elastically expandable if necessary so that the threaded part 15 can be unscrewed and folded away from the spout 29.

A first and a second recess 65, 67 are provided on the security ring 17. The first and the second holding strips 19a, 19b are received in the first and the second recesses 65, 67, respectively. This makes it possible to produce the first and second holding strips 19a, 19b directly from the security ring 17—for example, by being cut out of the security ring.

Between the first end 39 of the first holding strip 19a and the third end 51 of the second holding strip 19b, an arcuate web section 69 is formed, which has the height of the security ring 17. It can be seen in FIG. 5 that the web section 69 has a greater thickness than the remaining security ring 17. The thickness of the web section 69 has 1.5 times to 2 times the thickness of the remaining security ring 17. The transition from the web section and to the remaining security ring is continuous.

At the open edge 25, a first or second latching lug 71a, 71b is adjacent to the first or third end 39, 51. A gap 72 is necessarily present between the spaced-apart latching lugs 71a, 71b. This can best be seen in FIG. 8.

A holding web 73 is formed on the web section 69 and projects into the gap 72 in the closure position. The reinforced web section 69 provides sufficient stability to the security ring 17 that it cannot be deformed when the threaded part 15 is unscrewed. A removal of the security ring 17 is thereby reliably avoided. In addition, the holding web 73 centers the security ring 17 on the spout in that it rests against the annular projection 35 (FIG. 4). This feature additionally prevents the security ring 17 from being pulled off. Furthermore, the centering causes all the guaranteed or predetermined breaking webs to be cleanly torn, and thereby the opening of the threaded part 15 is reliably displayed. The closure cap 11 can have a diameter of 20 mm to 40 mm, or of 25 mm to 35 mm. The reinforced web section 69 and the holding web 73 prevent unintentional removal of the security ring 17—particularly when the threaded part 15 is unscrewed for the first time—even if the closure cap has a large diameter of up to 40 mm.

A radially outwardly protruding first or second step 75a, 75b is present at the open end of the first or second retaining lug 71a, 71b. The first and second lugs 71a, 71b have a height between 4 and 10 mm, or between 5 and 7 mm. The first and second steps 75a, 75b have a height between 1 and 3 mm, or between 1.5 and 2.5 mm. The height of the steps is kept as low as possible so that they do not protrude and represent a risk of injury to the user. The steps enable the first and second latching lugs to latch stably on the external thread 31 in the open position and hold the threaded part 15 in the open position wobble-free. In addition, the height of the latching lugs and the length of the first and second holding strips are dimensioned such that the threaded part is held stable in the open position and does not interfere when pouring filling material from the container.

At the web section 69, a first and a second depression 77a, 77b are provided, into which the first and second latching lugs 71a, 71b project in the closure position and between which the holding web 73 rises. As a result, the latching lugs can have the required height in order to generate sufficient stability in the open position. On the other hand, the depressions are so small that the web section 69 is not weakened.

The first and third ends 39, 51 are articulated to the open edge 25 with a first and a second hinge 79a, 79b. By means of the hinges, the threaded part 15 can be moved precisely and nevertheless smoothly into the open position, in that the threaded part 15 can be pivoted relative to the first and the second holding strips 19a, 19b.

The first and third ends 39, 51 are connected to the security ring 17 with a second or fourth predetermined breaking web 49, 61. In addition, the holding web 73 is releasably connected to the open edge 25 by a fifth predetermined breaking web 81. A stable support in the region of the web section 69 in the axial direction is thereby realized. The closure cap 11 can therefore be pushed onto the spout 29 without parts of the closure cap 11 being damaged. To increase the stability, even more first, second, third, and fourth predetermined breaking webs can also be provided on the holding strips 19a, 19b.

Since the closure cap 11 is rotationally symmetrical, it has a center point 83. The center point 83 lies in the imaginary plane between the open edge 25 and the security ring 17. The first end 39 and the third end 51 enclose a first opening angle 85 of at least 25 degrees and at most 50 degrees, or of at least 35 and at most 45 degrees, with respect to the center point 83 as the apex. The second end 41 and the fourth end 53 enclose a second opening angle 87 of at least 180 degrees and at most 220 degrees, or of at least 190 and at most 210 degrees, with respect to the center point 83 as the apex.

The first end 39 and the second end 41 enclose a third opening angle 89 of at least 40 degrees and at most 70 degrees, or of at least 50 and at most 60 degrees, with respect to the center point of the closure cap as the apex. The third end 51 and the fourth end 53 enclose a fourth opening angle 91 of at least 40 degrees and at most 70 degrees, or of at least 50 and at most 60 degrees, with respect to the center point 83 as the apex. It goes without saying that the sum of the first, second, third, and fourth aperture angles 85, 87, 89, 91 must be 360 degrees, since the first, second, third, and fourth aperture angles have the circle center 83 as the vertex. By selecting the first, second, third, and fourth opening angles, it is possible for the first and second holding strips 19a, 19b to have a certain length which enables the functions described further above of the closure cap 11 in combination with the latching lugs.

Expediently, the third and fourth opening angles 89, 91 are of equal size, which is equivalent to the first and second holding strips 19a, 19b being of equal length. The first and second holding strips 19a, 19b are carved out of the security ring 17. The closure cap 11 can therefore act as a so-called cone sealer and reliably seals the spout 29.

The closure cap 11 is made of a plastics material. Such plastics include inter alia PP and HDPE.

A sealing cone 93 is formed on the bottom 21 of the threaded part 25 in a known manner and interacts sealingly with the spout 29 in the closure position (FIG. 5).

If the closure cap 11 is pressed onto the spout 29, the pour opening 33 is closed by the closure cap 11, and the closure cap 11 is in the closure position. When the threaded part 15 is unscrewed from the spout 29, the first, second, third, and fourth predetermined breaking webs 47, 49, 59, 61 and the security webs 63 break. The centering and the increase in the stability of the security ring 17 by the web section 69 and the holding web 73 enable all the webs to be cleanly torn, and a removal of the security ring from the spout during unscrewing is reliably prevented.

After unscrewing, the threaded part 15 can be pivoted into the open position about the stops 79a, 79b. The retaining lugs 71a, 71b are located in a position in which it is self-explanatory that they are to be latched to the external thread 31. In the open position, the threaded part is held captive on the spout 29 and is not in the way when pouring filling material. Due to the latching, the security ring 17 is fixed to the spout in the direction of rotation and cannot be rotated. This prevents the closure cap 11 from turning into the filling material flow during pouring.

When the pour opening 33 is re-closed, the two latching lugs 71a, 71b do not rub against the external thread 31, but, rather, only stroke the inner side of the thread, because they are not positioned centrally between the holding strips 19a, 19b. The return of the threaded part from the open position into the closure position is thereby facilitated. The large gap 72 between the two latching lugs arises from the strip. If a latching lug arranged centrally between the holding strips 19a, 19b were formed on the threaded part 15 instead of the gap 72, this would lead to friction.

The protrusions 37 can be designed in accordance with the following figure description of FIGS. 9 and 10. Slots 97 are provided in the security ring in a manner distributed over the circumference of the security ring 17. The slots 97 each have an upper edge 99 and a lower edge 101. The upper edge 99 is formed by a circular-arc-shaped section of the security ring 17. The lower edge 101 corresponds to the free edge of a wall section 103 inclined inward in the radial direction. Due to the internal inclination of the wall section 103, the lower edge 101 has a smaller radius than the security ring 17 and can thereby lie against an abutment (annular protrusion 35) of the spout 29 when the threaded part 15 is unscrewed from the spout 29. The abutment is realized by the annular protrusion 35, which is formed below the outer thread 31 on the spout 29. When the threaded part 15 is unscrewed, the lower edge 99 engages in a form fit on the protrusion 35, as a result of which the security ring 17 is reliably held on the annular protrusion 35 even under high axial forces.

Each wall section 101 has a first subsection 105 and two second subsections 107. The first subsection 105 represents an inward folded casing section and is designed to be flat. The second subsections 107 adjoin the inward facing sides of the first subsection 105 and connect it to the security ring 17. The second subsections 107 can be curved or flat and face one another obliquely inward. The lower edge 101 of the slot 97 corresponds to the free edges of the first subsection 105 and of the second subsections 107, and lies in a plane 109 which is shown in FIG. 10. The plane 109 is oriented perpendicularly to the axis of rotation 110 of the spout 29. These described design features of the wall section 103 have the advantage that the wall section 103, with the entire lower edge 101, can rest against the annular protrusion 35 and, in the manner of a barb, does not yield in the event of an axial tensile force upward. As a result, the security ring 17 is held non-releasably against the protrusion 35 or can be removed from the protrusion 35 only by being destroyed. A movement of the first subsection 105 inward in the radial direction is prevented by provision of the second subsections 107. However, a movement of the first subsection 105 outward in the radial direction is possible. This movement is flexible, and after being pressed radially outward, the wall section 103 returns to its inward inclined home position. This has the further advantage that the security ring 17 can be easily demolded and can be pressed together with the threaded part 15 onto the spout 29 with little force. As a result of the flexibility of the wall section 103, the demolding from an injection mold and the pressing onto the spout 29 can take place without the risk of damaging the wall section 103.

It is desireable for the inclined wall sections 103 to have a lesser wall thickness than the remaining security ring 17. FIG. 10 shows that the region of the lower edge 101 has the least wall thickness. The above-described flexibility of the wall section 103 radially outward is thereby further improved. The wall thickness of the wall section 103 increases linearly downward starting from the lower edge 101.

FIGS. 9 and 10 show the security ring 17 without the threaded part 15. FIGS. 9 and 10 clearly show that an annular bead 111 on which the upper edges 99 rest is formed above the slots 97 on the security ring 17.

A first and a second inclination angle 113, 115 are plotted in FIG. 10. The first inclination angle 113 indicates the inclination of the first subsection 105 with respect to the plane of the lower edge 101. The first inclination angle 113 has a magnitude between 60 and 80 degrees, or between 65 and 75 degrees. The greater the first inclination angle 113, the better the stability of the wall sections 103 with respect to vertical force effects or axial tensile forces caused by the unscrewing of the threaded part 15. However, the first inclination angle 113 may not become too large, since otherwise the annular protrusion 35 cannot be sufficiently engaged.

The second inclination angle 115 indicates the inclination of the slot 97 with respect to the plane of the lower edge 111. The connecting line 117, which represents the inclination of the slot 97, is a connection of the upper edge 99 to the lower edge 101 in a plane spanned by the axis of rotation 110 and the connecting line 117. The second inclination angle 115 is enclosed by the connecting line 117 and the plane 109. The second inclination angle 115 has a magnitude between 30 and 50 degrees, or between 35 and 45 degrees. The greater the second inclination angle 115, the easier it is to demold the security ring 17.