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CN-116529057-B - Composite paperboard container for bulk solids and method of producing the same

CN116529057BCN 116529057 BCN116529057 BCN 116529057BCN-116529057-B

Abstract

The present disclosure relates to a composite paperboard container (1) for bulk solids comprising a tubular body (2) closed at a bottom end (3) above a container bottom opening (4) opposite a container top opening (5). The composite container comprises a rim member (9) surrounding the top opening and/or the bottom opening of the container. The rim member is attached to an end portion (10) of the tubular body by a first connection portion (11) of the rim member. The rim member is a molded rim member comprising pulp fibers. The rim member is connected to the tubular body by a first adhesive layer (14) comprising or consisting of a thermoplastic adhesive in an amount of from 0.1mg per 10mm container opening perimeter (p t ,p b ) at an end portion of said tubular body. The present disclosure also relates to a method of producing a composite paperboard container.

Inventors

  • M. Lundgren Goodman
  • G. Gezelius

Assignees

  • GPI系统股份公司

Dates

Publication Date
20260505
Application Date
20211014
Priority Date
20201028

Claims (20)

  1. 1. A composite paperboard container (1) for bulk solids, the composite paperboard container (1) comprising a tubular body (2) closed at a bottom end (3) on a container bottom opening (4) opposite a container top opening (5) at a top end (6) of the tubular body (2), the tubular body (2) having an inner surface (7) facing towards the interior of the tubular body (2) and an outer surface (8) facing away from the interior of the tubular body (2), the tubular body (2) extending in a longitudinal direction (L) between the bottom end (3) and the top end (6), the composite paperboard container (1) comprising a rim member (9) surrounding the container top opening (5) and/or the container bottom opening (4), the container top opening (5) having a top opening perimeter (p t ) and the container bottom opening (4) having a bottom opening perimeter (p b ), the rim member (9) being attached to a base layer (2) of the tubular body (2) along a first connecting portion (11) of the rim member (9) by means of the rim member (9) along a base layer (10) of the tubular body (2), characterized in that the rim member (9) is a molded rim member (9) comprising fibers, which are pulp fibers, which rim member comprises 100% pulp fibers and is formed by compression molding in a molding tool (15) between a female molding tool part (15 a) and a male molding tool part (15 b), which rim member (9) is connected to the tubular body (2) by a first adhesive layer (14), which first adhesive layer (14) comprises a thermoplastic adhesive and is arranged in a first gap between the first connecting portion (11) of the rim member (9) and the end portion (10) of the tubular body (2), which first adhesive layer (14) comprises or consists of the thermoplastic adhesive in an amount of from 0.1 mg per millimetre of the top opening periphery (p t ) and bottom opening periphery (p b ) at the end portion (10) of the tubular body (2), Wherein the rim member (9) comprises a square-sided U-shaped track portion (13) comprising a first side wall section (13 a) and a second side wall section (13 b) and a bottom section (13 c) facing an end edge (12) of the tubular body (2) and connecting the first side wall section (13 a) and the second side wall section (13 b), wherein a draft angle (α) between the bottom section (13 c) and the first side wall section (13 a) is in the range of 0 to 10 degrees.
  2. 2. The composite cardboard container (1) according to claim 1, wherein the first connecting portion (11) of the rim member (9) has a first distal edge (11 a), and the first distal edge (11 a) of the first connecting portion (11) is located at a distance from the end edge (12) of the tubular body, the distance (d) being in the range from 5mm to 50 mm.
  3. 3. The composite cardboard container (1) according to claim 2, wherein a circumferential area of the tubular body (2) facing the first connection portion (11) of the rim member (9) and extending at least 4 mm from the end edge (12) of the tubular body (2) towards the opposite end edge is covered by the first adhesive layer (14).
  4. 4. A composite cardboard container (1) according to any one of claims 1 to 3, wherein the first connection portion (11) faces the inner surface (7) of the tubular body (2) and the rim member (9) comprises a second connection portion facing the outer surface (8) of the tubular body (2), the rim member (9) being further connected to the tubular body (2) by a second adhesive layer applied on the outer surface (8) of the tubular body (2), the second adhesive layer comprising or consisting of a thermoplastic adhesive, the second adhesive layer being arranged in a second gap between the second connection portion of the rim member (9) and the end portion (10) on the outer surface (8) of the tubular body (2).
  5. 5. A composite cardboard container (1) according to any one of claims 1-3, wherein the rim member (9) surrounds the container top opening (5) and is a rim part comprising a rim portion (9 a) and a cover portion (9 b), wherein the rim portion (9 a) and the cover portion (9 b) are molded in one piece, the rim portion (9 a) being connected to the cover portion (9 b) via a hinge portion (9 c).
  6. 6. A composite paperboard container (1) according to any of claims 1-3, wherein the composite paperboard container (1) is free of plastic rim, lid or bottom parts.
  7. 7. A composite paperboard container (1) according to any of claims 1-3, wherein the density of the rim member (9) is in the range of 0.2 kg/dm 3 to 1.5 kg/dm 3 .
  8. 8. A composite cardboard container (1) according to any one of claims 1-3, wherein the first connecting portion (11) is provided with a distance element (20), the distance element (20) facing the tubular body (2).
  9. 9. A composite cardboard container (1) according to any one of claims 1-3, wherein the first connecting portion (11) comprises a first side wall section (13 a) and a guiding side wall section (13 d), the guiding side wall section (13 d) extending from the first side wall section (13 a), the guiding side wall section (13 d) being at a greater distance from the tubular body (2) than the first side wall section (13 a).
  10. 10. The composite paperboard container (1) according to claim 1, wherein the rim member (9) is a molded rim member (9) comprising softwood pulp fibers.
  11. 11. The composite paperboard container (1) according to claim 2, wherein the distance (d) is in the range from 5 mm to 40 mm.
  12. 12. A composite cardboard container (1) according to claim 3, wherein a circumferential area of the tubular body (2) facing the first connection portion (11) of the rim member (9) and extending at least 10 mm from the end edge (12) of the tubular body (2) towards the opposite end edge is covered by the first adhesive layer (14).
  13. 13. The composite paperboard container (1) according to claim 6, wherein the composite paperboard container (1) is free of plastic parts.
  14. 14. The composite paperboard container (1) according to claim 7, wherein the density of the rim member (9) is in the range of 0.2 kg/dm 3 to 1 kg/dm 3 .
  15. 15. The composite paperboard container (1) according to claim 14, wherein the density of the rim member (9) is in the range of 0.4 kg/dm 3 to 0.8 kg/dm 3 .
  16. 16. The composite paperboard container (1) according to claim 1, wherein the draft angle (a) between the bottom section (13 c) and the first sidewall section (13 a) is in the range of 0 to 5 degrees.
  17. 17. The composite cardboard container (1) according to claim 8, wherein the distance element (20) is a rib extending in a longitudinal direction (L).
  18. 18. Method of producing a composite paperboard container (1) for bulk solids according to any of the preceding claims, the method comprising the steps of: a) -bending a paperboard laminate sheet (2 ") comprising a paperboard substrate layer into a tube (2 '), the tube (2 ') having a longitudinal direction (L), closing the tube (2 ') in the longitudinal direction (L) by joining overlapping or abutting side edges (16, 17) of the paperboard laminate sheet (2") forming a tubular body (2), the tubular body (2) having an inner surface (7) facing the interior of the tubular body (2) and an outer surface (8) facing away from the interior of the tubular body (2); b) -providing said tubular body (2) with a predetermined cross-sectional shape; c) Closing the tubular body (2) at a bottom end (3) on a container bottom opening (4) opposite to a container top opening (5) at a top end (6) of the tubular body (2); d) Providing pulp fibers into a molding tool (15), the molding tool (15) comprising a female molding tool part (15 a) and a male molding tool part (15 b), compression molding the pulp fibers between the female molding tool part and the male molding tool part, thereby forming a three-dimensionally shaped rim member (9) comprising 100% pulp fibers, the rim member (9) comprising a first connecting portion (11) having a first distal edge (11 a); e) Providing a first adhesive layer (14) comprising a thermoplastic adhesive to the first connecting portion (11) of the rim member (9), or alternatively or additionally to an end portion (10) of the tubular body (2) along an end edge (12) of the tubular body (2), the thermoplastic adhesive being in an amount of from 0.1 mg per millimetre of top opening perimeter (p t ) and bottom opening perimeter (p b ) at the end portion (10), and F) -providing the rim member (9) to the end portion (10) thereby adhesively attaching the rim member (9) to the tubular body (2), Wherein the rim member (9) formed in step d) comprises a square-sided U-shaped track portion (13), the track portion (13) comprising a first side wall section (13 a) and a second side wall section (13 b) and a bottom section (13 c) facing an end edge (12) of the tubular body (2), and wherein step e) comprises arranging the rim member (9) such that the bottom section (13 c) faces the end edge (12) of the tubular body (2).
  19. 19. The method according to claim 18, wherein the density of the rim member (9) is in the range of 0.2 kg/dm 3 to 1.5 kg/dm 3 .
  20. 20. The method according to claim 18 or 19, wherein a draft angle (a) between the bottom section (13 c) and the first sidewall section (13 a) is in the range of 0 degrees to 5 degrees.

Description

Composite paperboard container for bulk solids and method of producing the same Technical Field The present disclosure relates to a composite paperboard container and a method of producing the same. Background In the field of disposable containers for products such as infant formulas, tobacco, detergents, and the like, there is an ongoing need to reduce the carbon footprint of such products by minimizing the resource usage of the disposable containers and making the containers recyclable. The disposable container referred to herein is a composite container having a tubular body made of a laminate sheet comprising a carton layer, i.e. a layer made mainly of cellulose fibers. For some containers, the upper and lower edges of the container include plastic rim members that are connected to the edges of the packaging container. This provides a pleasant and tidy appearance to the packaging container, and the top or bottom of the container may also be more resistant to wear. In order to provide a container without plastic parts, the top and/or bottom part of the container may alternatively be made of a folded-in end portion of the tubular body. However, the appearance of such packaging containers may be somewhat less attractive and less wear resistant at the bottom end of the packaging container. Traditionally, paper-based materials have been considered less suitable for use in making lids and rims for paperboard containers because they are considered to have lower shape stability and are vulnerable and less wear resistant than plastic parts. It is also difficult to achieve a secure and tight attachment of such components to the body of the paperboard container and a tight closure between the rim member and the container lid. Accordingly, there is a need to provide further packaging for sensitive goods such as food products with improved recyclability without sacrificing the durability or packaging security of the packaged goods. Disclosure of Invention The above object can be achieved by the method of manufacturing a composite paperboard container of the following embodiments, using the composite paperboard container of the following embodiments. Further advantages and advantageous features of the invention are disclosed in the following description. According to one embodiment, a composite paperboard container for bulk solids, the composite paperboard container comprising a tubular body closed at a bottom end on a container bottom opening opposite a container top opening at a top end of the tubular body, the tubular body having an inner surface facing an interior of the tubular body and an outer surface facing away from the interior of the tubular body, the tubular body extending in a longitudinal direction between the bottom end and the top end, the composite paperboard container comprising a rim member surrounding the container top opening and/or the container bottom opening, the container top opening having a top opening perimeter and the container bottom opening having a bottom opening perimeter, the rim member being attached to an end portion of the tubular body along an end edge of the tubular body by a first connection portion of the rim member, the tubular body being made of a laminated sheet comprising a carton substrate layer, characterized in that the rim member is a molded rim member comprising fibers, the fibers being pulp fibers, the rim member comprising 100% pulp fibers and being formed by compression molding in a molding tool between a female molding tool part and a male molding tool part, the rim member being connected to the tubular body by a first adhesive layer comprising a thermoplastic adhesive and being arranged in a first gap between the first connection portion of the rim member and the end portion of the tubular body, the first adhesive layer comprising or consisting of the thermoplastic adhesive in an amount of from 0.1 mg per millimetre of the container opening periphery at the end portion of the tubular body, wherein the rim member comprises a square-sided U-shaped track portion comprising a first side wall section and a second side wall section and a bottom section facing an end edge of the tubular body and connecting the first side wall section and the second side wall section. According to one embodiment, a method of producing a composite paperboard container for bulk solids, the method comprising the steps of a) bending a paperboard laminate sheet comprising a paperboard substrate layer into a tube, the tube having a longitudinal direction, closing the tube in the longitudinal direction by engaging overlapping or abutting side edges of the paperboard laminate sheet, thereby forming a tubular body having an inner surface facing the interior of the tubular body and an outer surface facing away from the interior of the tubular body; b) providing the tubular body with a predetermined cross-sectional shape, c) closing the tubular body at a bottom end on a container bottom opening opp