CN110963178A - Composite paperboard, packaging paper tube and forming method thereof - Google Patents
Composite paperboard, packaging paper tube and forming method thereof Download PDFInfo
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- CN110963178A CN110963178A CN201911314049.3A CN201911314049A CN110963178A CN 110963178 A CN110963178 A CN 110963178A CN 201911314049 A CN201911314049 A CN 201911314049A CN 110963178 A CN110963178 A CN 110963178A
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- composite paperboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/62—Uniting opposed surfaces or edges; Taping by adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
- B65D3/04—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially cylindrical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
Abstract
The invention discloses a composite paperboard for packaging a paper tube, the packaging paper tube and a forming method thereof, wherein the composite paperboard comprises a plurality of paper materials which are stacked up and down and adhered together, the two ends of the head and the tail of the composite paperboard are sequentially staggered and adhered in a step shape, so that connecting ends with step surfaces are respectively formed at the two ends of the head and the tail of the composite paperboard, and when the composite paperboard is butted and wound together in the head and the tail, connecting edges which respectively belong to the same paper materials in the two connecting ends are adhered together; the packaging paper tube formed by the composite paperboard decomposes the interface sealing problem of a plurality of paper materials into the interface sealing of a single paper material, so that the technical difficulty of the interface sealing of the paper tube formed by the plurality of paper materials is fundamentally reduced, and a user can arbitrarily increase the number of the paper materials of the composite paperboard according to the requirement; in addition, the composite paperboard using the semi-finished product can be used for quickly forming a packaging paper tube, has lower requirements on equipment and places, and is convenient to transport.
Description
Technical Field
The invention relates to the technical field of packaging paper cylinders, in particular to a composite paperboard for packaging paper cylinders, a packaging paper cylinder and a forming method of the packaging paper cylinder.
Background
The paper tube is convenient for transporting and storing food, and most of the food such as biscuits, potato chips and the like are packaged by the paper tube, so that the paper tube is convenient to recycle and low in cost. According to different forming processes of the paper tube, the currently produced paper tubes mainly comprise two types, namely a twill paper tube and a flat-rolled paper tube. The twill paper tube is formed by coating various different web materials with adhesives, feeding the web materials into a twill tube coiling machine and coiling the web materials; and the flat winding paper tube winds the paper material in parallel for one or more circles. The use history of twill paper tubes is long, but because the twill paper tubes need demoulding and cutting processes in the forming process, the introduced demoulding agent and cutting scraps can influence the sanitation grade of the paper tubes, and therefore, more and more manufacturers use flat-rolled paper tubes. In order to increase the wall thickness of the flat-rolled paper tube and improve the physical strength and the supporting strength of the flat-rolled paper tube, under the regulation of limited optional paper materials, the paper materials are mostly stacked in a multi-paper material stacking mode, the technical difficulty is increased for sealing at an interface by stacking the single paper materials, and the sealing effect of the paper tube is greatly influenced once the paper tube is not well processed. Therefore, how to design the interface structure and further ensure the sealing effect for the multi-layer wound paper becomes a problem which needs to be solved urgently in the industry.
Disclosure of Invention
One of the objectives of the present invention is to provide a composite paperboard for packaging paper tubes, which can increase the wall thickness of the composite paperboard by increasing any number of paper materials, and ensure the sealing effect of the joint.
Another object of the present invention is to provide a packing paper tube, which can increase the wall thickness of the packing paper tube by increasing any number of paper materials, and can ensure the sealing effect of the joint.
Another object of the present invention is to provide a method for forming a packing paper tube, by which the wall thickness of the packing paper tube can be increased by increasing a plurality of paper materials at will, and the sealing effect of the joint can be ensured.
In order to achieve the purpose, the invention discloses a composite paper board for packaging paper tubes, which comprises a plurality of paper materials which are stacked up and down and are attached together, wherein the plurality of paper materials are sequentially attached in a staggered manner in a step shape at the head end and the tail end of the composite paper board, so that connecting ends with step surfaces are respectively formed at the head end and the tail end of the composite paper board, when the composite paper board is butted and wound together in a head-to-tail mode, the connecting edges of the same paper materials in the two connecting ends can be attached together, the composite paper board comprises inner layer paper positioned on the winding inner side of the composite paper board, and the inner layer paper is covered with a first moisture-proof barrier layer.
Compared with the prior art, the composite paperboard for packaging the paper tube is formed by overlapping and compounding a plurality of paper materials, so that the number of the paper materials can be increased according to the thickness of the required composite paperboard, and the plurality of paper materials are sequentially staggered and laminated in a step shape during compounding, so that two connecting ends of the composite paperboard respectively form a relatively reverse connecting end, the end of each paper material is exposed for a certain length in each connecting end, a step surface is formed on each connecting end, and the connecting edges of the same paper materials in the two connecting ends can be laminated together through the step surfaces when the composite paperboard is wound in an end-to-end manner, so that the interface sealing problem of the plurality of paper materials is decomposed into the interface sealing of a single paper material, the technical difficulty of the interface sealing of the paper tube formed by the plurality of paper materials is fundamentally reduced, and the sealing effect of the interface is further ensured, the number of the paper materials of the composite paperboard can be increased arbitrarily by a user according to the requirement; in addition, the composite paperboard with the structure is a semi-finished product for producing and molding the packaging paper tube, the packaging paper tube can be rapidly molded by using the composite paperboard of the semi-finished product, the requirements on equipment and places are low, and the transportation is convenient.
Preferably, two the link is the ladder face respectively towards the first end in the coiling outside of composite paperboard and the ladder face towards the second end of the coiling inboard of composite paperboard, be at least in on the inlayer paper first end department is provided with prevents that the limit oozes the structure.
Preferably, the edge leakage prevention structure comprises a barrier agent coated on the inner layer paper at the end wall of the first end, and the barrier agent extends from the end wall of the inner layer paper to the upper surface and the lower surface which are in contact with the inner layer paper.
Preferably, first dampproofing barrier layer is for covering establish one deck barrier film on the inlayer paper, the head and the tail both ends of barrier film respectively with other the paper material is echelonment dislocation set in proper order, just, the barrier film is located the one end at first end department is provided with the hem portion of outside book, the hem portion forms the structure is oozed to the prevention limit.
Preferably, one end of the inner paper adjacent to the first end is provided with a transverse cut portion located at a back side of the first moisture-proof barrier layer, and an end portion of the inner paper may be folded inward of the transverse cut portion by the transverse cut portion, thereby forming the edge leakage preventing structure.
Preferably, the composite paperboard further comprises an outer layer of paper positioned on the winding outer side of the composite paperboard, and the outer layer of paper is covered with a second moisture-proof barrier layer for blocking moisture from entering the composite paperboard.
The invention also discloses a packaging paper tube which comprises a tube body, wherein the tube body is formed by winding the composite paper boards in an end-to-end butt joint mode.
The invention also discloses a forming method of the packaging paper tube, wherein the packaging paper tube comprises a tube body, and the forming method specifically comprises the following steps:
s1), a plurality of paper materials forming the barrel are stacked up and down and are bonded together to form a composite paperboard, the composite paperboard comprises inner-layer paper positioned on the winding inner side of the composite paperboard, the inner-layer paper is covered with a first moisture-proof barrier layer for preventing water vapor from entering the composite paperboard, and a plurality of paper materials are sequentially bonded in a staggered mode in a step shape at the head end and the tail end of the composite paperboard, so that connecting ends with step surfaces are formed at the head end and the tail end of the composite paperboard respectively;
s2), the composite paper boards are butted and wound together end to end, and the connecting edges of the same paper materials at the two connecting ends are attached together when the composite paper boards are butted.
Preferably, the barrier agent is coated on the end wall of the inner layer paper, and the barrier agent extends from the end wall of the inner layer paper to the upper surface and the lower surface which are contacted with the end wall of the inner layer paper.
Preferably, two the link is the ladder face orientation respectively the first end and the ladder face orientation in the coiling outside of composite board the inboard second end of coiling of composite board, first dampproofing barrier layer is established for covering one deck barrier film on the inlayer paper, the head and the tail both ends of barrier film respectively with other the paper materials are ladder-shaped dislocation set in proper order, will the barrier film is located the one end that first end department was provided with outside book and forms hem portion, butt joint during composite board, will the hem portion butt joint of barrier film is located the inlayer paper other end on the barrier film.
Preferably, two the link is the ladder face orientation respectively the first end and the ladder face orientation in the coiling outside of composite board the inboard second end of coiling of composite board is close to the first end the one end of inlayer paper is provided with a horizontal cutting portion, horizontal cutting portion is located the dorsal part of first dampproofing barrier layer, will the tip of inlayer paper to fold in the horizontal cutting portion to the shape is located the joint edge in first end.
Drawings
Figure 1 is a schematic perspective view of a wrapper cylinder according to an embodiment of the present invention.
Fig. 2 is a schematic view of the opening state of the packaging paper tube interface in fig. 1.
Fig. 3 is a schematic plan view of the composite paperboard in one embodiment of the present invention.
Fig. 4 is a schematic plan view of a composite paperboard in another embodiment of the present invention.
Fig. 5a and 5b are schematic views illustrating the formation structure of the edge-permeation preventing structure according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, implementation principles, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in combination with the embodiments.
As shown in fig. 1 to 3, the present invention discloses a packing paper tube 1 of a flat roll structure, the packing paper tube 1 includes a composite paper board 10 compounded by stacking a plurality of paper materials 11 on top of each other, each paper material 11 can be adhered together by an adhesive, at the head and tail ends of the composite paper board 10, a plurality of paper materials 11 are sequentially attached in a staggered manner in a step shape, so as to form a connection end 12 having a step surface at each of the head and tail ends of the composite paper board 10, when the composite paper board 10 is wound in a butt-joint manner, the connection ends 12 of the same paper materials 11 can be respectively attached together, the composite paper board 10 includes an inner paper 110 located at the winding inner side thereof, the inner paper 110 is covered with a first moisture barrier layer 13, the first moisture barrier layer 13 can be used to prevent moisture permeating through the paper materials 11 from entering the packing paper tube 1, but also prevents the articles in the packaging paper tube 1 from directly contacting the inner layer paper 110, and simultaneously prevents grease on food in the packaging paper tube 1 from entering the paper material 11. The first moisture-proof barrier layer 13 can be a moisture-proof coating, a laminated film, an aluminum-plastic film material, and the like. Referring to fig. 2 and 3, the composite structure of the composite paperboard 10 having three paper materials 11 is specifically described, wherein the three paper materials 11 are respectively an inner layer paper 110, an outer layer paper 112 and a middle layer paper 111, the middle layer paper 111 is coated on the inner layer paper 110, the outer layer paper 112 is coated on the middle layer paper 111, when the composite paperboard 10 is wound into the packaging paper tube 1, the inner layer paper 110 forms the inner wall of the packaging paper tube 1, and the outer layer paper 112 forms the outer wall of the packaging paper tube 1. The two connection ends 12 of the composite paperboard 10 are a first end 120 with a stepped surface facing the outside of the composite paperboard 10 and a second end 121 with a stepped surface facing the inside of the composite paperboard 10, in the first end 120, the end of the inner layer paper 110 has a first connection edge 1100 extending to the outside of the middle layer paper 111 by a certain length, the end of the middle layer paper 111 has a second connection edge 1110 extending to the outside of the outer layer paper 112, and the end of the outer layer paper 112 has a third connection edge 1120, so that, in the second end 121, the end of the outer layer paper 112 has a fourth connection edge 1121 extending to the outside of the middle layer paper 111, the end of the middle layer paper 111 has a fifth connection edge 1111 extending to the outside of the outer layer paper 112, and the inner layer paper 110 has a sixth connection edge 1101, as shown in fig. 1 and 2, when the first end 120 and the second end 121 of the composite paperboard 10 are butted, the first connection edge 1100 is attached to the sixth connection edge 1111, and the second connection edge 1110 is attached to the fifth connection edge 1111, the third connecting edge 1120 is attached to the fourth connecting edge 1121, and then each attached connecting edge is subjected to hot pressing or ultrasonic welding, so that the connecting edges which respectively belong to the same paper materials 11 in the two connecting ends 12 are attached together, the thickness of the interface at the interface is reduced, and the sealing is finished by welding the paper materials 11 made of the same materials together, so that the interface is not easy to unseal, and the sealing effect is good. Therefore, the composite paperboard 10 with the structure not only achieves the purpose of increasing the wall thickness by compounding a plurality of paper materials 11, but also decomposes the interface sealing problem of the plurality of paper materials 11 into the interface sealing of a single paper material 11, so that the technical difficulty of the interface sealing of the packaging paper tube 1 consisting of the plurality of paper materials 11 is fundamentally reduced, the sealing effect of the interface is further ensured, and the number of the paper materials 11 of the composite paperboard 10 can be increased as required by a user. In addition, because packing fiber container 1 is the tube structure, if directly transport packing fiber container 1, can occupy great transportation space, increase the cost of transportation, however, if the compound cardboard 10 with above-mentioned structure is the transportation object, will effectively improve the operating efficiency, practices thrift the cost of transportation, and end user only need carry out simple processing to compound cardboard 10 and can form packing fiber container 1, and convenient to use is favorable to the popularization in market. Preferably, in order to improve the moisture-proof effect of the packaging paper tube 1, the outer layer paper 112 is further covered with a second moisture-proof barrier layer 14 for blocking moisture from entering into the composite paper board 10.
For packaging paper sleeve 1, moisture and grease can penetrate through the end walls at the interface of paper 11, thus further improving the edge-penetration-preventing structure on inner paper 110 at least at first end 120. Specifically, the following three edge leakage prevention structures are disclosed in this embodiment:
one is, as shown in fig. 3, the edge-leakage-preventing structure is a blocking agent 15 coated on the inner paper 110 at the end wall of the first end 120, and the blocking agent 15 extends from the end wall of the inner paper 110 to the upper and lower surfaces in contact therewith, so as to block moisture and grease from entering and exiting the inner paper 110 through the end wall, and in addition, the blocking agent 15 may be coated on the end wall of the inner paper 110 at the second end 121. The blocking agent 15 may be an aqueous epoxy acrylate coating having FDA approval or a paper water repellent.
Secondly, as shown in fig. 4, the first moisture-proof barrier layer 13 is a barrier film, such as an aluminum-plastic film, coated on the inner paper 110, the ends of the barrier film are staggered with the other paper 11 in a step shape, and a first folding portion 16 that is folded outwards is disposed at the end of the barrier film at the first end 120, and the first folding portion 16 forms an edge leakage-proof structure. In this embodiment, when the barrier film is coated, the head end and the tail end of the barrier film form step surfaces at the two ends of the composite paperboard 10 along with the other paper materials 11, the first hem portion 16 coats the portion between the end of the barrier film and the inner paper 110 adjacent to the end of the barrier film, and when the roll-up packaging paper tube 1 is wound, the first hem portion 16 extending out of the inner paper 110 is attached to the barrier film at the second end 121.
Thirdly, as shown in fig. 5a and 5b, one end of the inner sheet 110 near the first end 120 is provided with a lateral cut 17, the lateral cut 17 is positioned at a rear side of the first moisture barrier layer 13, and an end of the inner sheet 110 may be folded inward of the lateral cut 17 by the lateral cut 17, thereby forming an edge leakage prevention structure. Specifically, the thickness of the transverse cutting portion 17 is half of the thickness of the entire inner layer paper 110, and a second flange portion 18 for covering the end wall is formed at the end wall of the inner layer paper 110 by folding the transverse cutting portion 17, thereby effectively preventing the edge leakage phenomenon. When the lateral cut portion 17 is formed, a laser cutting method or a grinding method may be used.
In addition, the invention also discloses a forming method of the packaging paper tube 1 with the structure, as shown in fig. 1 to 5b, comprising the following steps:
s1), according to the required wall thickness requirement, a plurality of paper materials 11 forming the cylinder body are stacked up and down and adhered together to form a composite paperboard 10, the composite paperboard 10 comprises inner-layer paper 110 positioned on the winding inner side of the composite paperboard, a first moisture-proof barrier layer 13 for blocking water vapor from entering the composite paperboard 10 is covered on the inner-layer paper 110, the paper materials 11 are sequentially attached in a staggered mode in a step mode at the head end and the tail end of the composite paperboard 10, and therefore connecting ends 12 with step surfaces are formed at the head end and the tail end of the composite paperboard 10 respectively; when the paper is attached, firstly, a first moisture-proof barrier layer 13 is attached or coated on the inner-layer paper 110, then, a layer of adhesive is brushed on the inner-layer paper 110, then, the second-layer paper 11 is attached in a stepped dislocation mode, then, a layer of adhesive is brushed on the second-layer paper 11, and the third-layer paper 11 is attached in a stepped dislocation mode continuously until the outermost layer of paper 11 is reached.
S2), the composite paper boards 10 formed in the step 1 are butted and wound together end to end, and the connecting edges of the same paper materials 11 at the two connecting ends 12 are attached together during butt joint, so that the packaging paper tube 1 is formed.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.
Claims (11)
1. The utility model provides a composite board for packing paper section of thick bamboo, its characterized in that stacks the paper material that the laminating is in the same place from top to bottom including a plurality of, composite board's head and the tail both ends department, it is a plurality of the paper material is the echelonment laminating of misplacing in proper order each other, thereby composite board's head and the tail both ends form a link that has the ladder face respectively, work as composite board head and the tail butt joint is convoluteed together, can be with two belong to the same respectively in the link the joint edge laminating of paper material is in the same place, composite board is including being located its inboard inlayer paper of coiling, the inlayer paper covers and is equipped with first dampproofing barrier layer.
2. The composite paperboard for packaging paper tubes as claimed in claim 1, wherein the two connecting ends are a first end facing the outside of the composite paperboard in winding and a second end facing the inside of the composite paperboard in winding, and the inner paper is provided with an edge-leakage-preventing structure at least at the first end.
3. The composite paperboard for packaging a paper tube as claimed in claim 2, wherein the edge leakage prevention structure comprises a blocking agent coated on the inner paper at the end wall of the first end, and the blocking agent extends from the end wall of the inner paper to the upper and lower surfaces in contact therewith.
4. The composite paperboard for packaging paper tubes as claimed in claim 2, wherein the first moisture-proof barrier layer is a barrier film coated on the inner paper layer, the head and tail ends of the barrier film are respectively staggered with the other paper materials in a step shape, and a folded edge portion which is folded outwards is arranged at one end of the first end of the barrier film, and the folded edge portion forms the edge leakage-proof structure.
5. The composite paperboard for packaging a paper tube as claimed in claim 2, wherein an end of said inner paper adjacent to said first end is provided with a transverse cut on a back side of said first moisture barrier layer, whereby an end of said inner paper is folded inwardly of said transverse cut to form said edge leakage prevention structure.
6. The composite paperboard for packaging paper tubes of claim 1 further comprising an outer paper layer on the outside of the composite paperboard wrap, said outer paper layer overlying a second moisture barrier layer for blocking moisture ingress into said composite paperboard.
7. A wrapping paper cartridge comprising a body formed by winding a composite paperboard according to any one of claims 1 to 6 end to end.
8. A method of forming a wrapping paper tube, the wrapping paper tube including a tube body, the method comprising:
s1), a plurality of paper materials forming the barrel are stacked up and down and are bonded together to form a composite paperboard, the composite paperboard comprises inner-layer paper positioned on the winding inner side of the composite paperboard, the inner-layer paper is covered with a first moisture-proof barrier layer for preventing water vapor from entering the composite paperboard, and a plurality of paper materials are sequentially bonded in a staggered mode in a step shape at the head end and the tail end of the composite paperboard, so that connecting ends with step surfaces are formed at the head end and the tail end of the composite paperboard respectively;
s2), the composite paper boards are butted and wound together end to end, and the connecting edges of the same paper materials at the two connecting ends are attached together when the composite paper boards are butted.
9. The method of claim 8, wherein a blocking agent is coated on the end wall of the inner paper, and the blocking agent extends from the end wall of the inner paper to the upper and lower surfaces contacting the inner paper.
10. The forming method of the packing paper tube as claimed in claim 8, wherein the two connecting ends are respectively a first end with a step surface facing the outside of the composite paper board and a second end with a step surface facing the inside of the composite paper board, the first moisture-proof barrier layer is a layer of barrier film coated on the inner layer paper, the head and tail ends of the barrier film are sequentially staggered from the other paper materials, one end of the barrier film at the first end is provided with an outward-folded edge to form a folded edge portion, and when the composite paper board is butted, the folded edge portion of the barrier film is butted on the barrier film at the other end of the inner layer paper.
11. The method as claimed in claim 8, wherein the two connecting ends are a first end facing the outside of the composite paperboard and a second end facing the inside of the composite paperboard, and a transverse cutting portion is provided at an end of the inner paper adjacent to the first end, the transverse cutting portion being located at a back side of the first moisture barrier layer, and an end portion of the inner paper is folded inward of the transverse cutting portion to form a connecting edge located in the first end.
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| CN201911314049.3A CN110963178A (en) | 2019-12-17 | 2019-12-17 | Composite paperboard, packaging paper tube and forming method thereof |
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| CN201911314049.3A CN110963178A (en) | 2019-12-17 | 2019-12-17 | Composite paperboard, packaging paper tube and forming method thereof |
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Cited By (2)
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| CN111804810A (en) * | 2020-07-09 | 2020-10-23 | 哈尔滨工业大学 | Forming method of NiAl alloy complex thin-wall hollow component |
| WO2022246671A1 (en) * | 2021-05-26 | 2022-12-01 | 张静文 | Paper container and manufacturing method therefor |
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| CN208307205U (en) * | 2018-05-22 | 2019-01-01 | 江阴润渲纸业有限公司 | Seep paper-plastic container in anti-side |
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