B31B2221/00 - CPC Classification

• B31B2221/05 » the bags having multilayered walls, e.g. lined or laminated 12
• B31B2221/10 » the bags having no structural provision at the base for thickness of content, e.g. flat bags 12
• B31B2221/20 » the bags having structural provision at the base for thickness of content 38
• B31B2221/25 » the bags being of pointed or tapered shape 3
• B31B2221/40 » involving square or cross bottom forming 4
• B31B2221/50 » involving joining superimposed sheets, e.g. with separate bottom sheets 11
• B31B2221/60 » starting from tubular sheets 5

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