Packaging bag and preparation method therefor

Abstract

A packaging bag, comprising paper substrates (1), a middle accommodating portion (2), a top handle portion (3) and a bottom sealing portion (4), wherein the middle accommodating portion (2) has a vertically arranged first bonding layer (13), and the bottom sealing portion (4) has a transversely arranged second bonding layer (14); and the top handle portion (3) comprises a middle lifting region (5) and two side forming regions (6). In a preparation method for the packaging bag, the first bonding layer (13) and the second bonding layer (14) are formed by means of vertex adhesive application. In the bag, the effect of bonding between the paper substrates is improved, and the strength of the paper substrates is enhanced; the paper bag is thus more suitable for transportation.

Description

Packaging bag and preparation method thereof Technical Field

[0001] The present invention relates to an outer packaging product and a preparation method thereof, and in particular to a packaging bag and a preparation method thereof. Background Art

[0002] Some tissue products require intermediate packaging to combine multiple individually packaged products for easy stacking, transportation, and sales. Currently, intermediate packaging on the market is typically made of plastic film, which offers low cost, excellent sealing properties, and is well-suited for existing automated packaging production equipment. Currently, the industry's intermediate packaging for tissues is made of plastic film and produced using a bag-making machine, resulting in a bag with three closed sides and one open side. With increasing emphasis on environmental protection, consumers are demanding that tissue products be packaged entirely with biodegradable substrates, particularly paper. However, industry insiders are more concerned about whether paper substrates can be automated and efficiently produced.

[0003] Currently, medium-sized tissue products contain multiple individually packaged products, typically ranging from 2 to 20 packages, or even more. Large-capacity medium-sized bags, in particular, bear the heavy weight of the items and require a sturdy, durable bag body. Therefore, their thickness is typically higher than that of the individual packaging materials within, and certain requirements are placed on the bonding strength of the bag body joints. To achieve 100% biodegradability, PLA fiber can be used, but its production cost is high, and it is prone to aging, with its strength decreasing over time, making it difficult to store. Therefore, using 100% natural plant fiber as the paper substrate is optimal. However, these fibers generally lack heat-sealing properties, resulting in low bonding strength when bonded. The resulting packaging bags are prone to tearing, have weak load-bearing properties, and are prone to separation at the hot seal. Therefore, using paper substrates as the material for medium-sized bags first requires resolving the bonding issue, a difficult problem plaguing the industry.

[0004] Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a packaging bag that is not easy to tear and is tightly bonded; another purpose of the present invention is to provide a method for preparing the above-mentioned packaging bag.

[0006] Technical solution: The packaging bag body described in the present invention includes a paper base, a middle accommodating portion, a top handle portion and a bottom sealing portion; the middle accommodating portion has a vertically arranged first adhesive layer, and the bottom sealing portion has a horizontally arranged second adhesive layer; the top handle portion further includes a middle pulling area and two side forming areas.

[0007] Furthermore, the first adhesive layer and the second adhesive layer have the same structure, and both sequentially comprise a first paper base layer, a first composite layer, an intermediate adhesive layer, a second composite layer, and a second paper base layer.

[0008] Furthermore, the first composite layer and the second composite layer include fibers and a curing adhesive mixed with the fibers; the first paper base layer and the second paper base layer are paper matrices, and the intermediate bonding layer is a degradable curing adhesive layer.

[0009] Furthermore, the paper matrix includes fiber material and adhesive filling around the fiber material.

[0010] Furthermore, the paper substrate has a grammage of 60-150 grams per square meter, preferably 70-130 grams per square meter.

[0011] Furthermore, the curing adhesive is acrylate, and the coating amount of the curing adhesive layer is 3-20 grams per square meter.

[0012] Furthermore, the middle pulling area includes: a reinforcing sheet layer, a first paper layer and a second paper layer in sequence; the materials of the first paper layer and the second paper layer include fiber material and adhesive filled around the fiber material, and the reinforcing sheet layer includes stiffening materials, paper matrix and other reinforcing materials.

[0013] Furthermore, the middle lifting area is provided with lifting holes for facilitating lifting.

[0014] A method for preparing the above-mentioned packaging bag body comprises the following steps:

[0015] (1) Unroll the paper substrate from the film roll and pass it through the conveyor roller into the sizing device;

[0016] (2) The paper substrate is glued at fixed points by a glue-applying device, and a uniform glue layer is applied on the longitudinal sides, top and bottom of the paper substrate;

[0017] (3) The paper substrate after gluing enters the folding device, which folds the paper substrate with the glue layer so that the longitudinal sides coated with the glue layer are bonded together, and then is hot-pressed and sealed to form a preliminary cylindrical shape;

[0018] (4) The two sides of the hot-sealed cylinder are passed through an inset machine for inset;

[0019] (5) After completing the inserting, first split the tube, then place the reinforcing sheet on the top handle, and finally heat seal the top handle to complete the sealing of the upper end of the bag;

[0020] (6) After the top handle is sealed, it enters the punching device to punch holes in the top handle to form a handle hole;

[0021] (7) After the items are placed inside the bag, the bottom sealing part is sealed by heat pressing.

[0022] Furthermore, the gluing device includes a glue transfer roller, a gluing roller and a paper feeding roller. A strip protrusion is provided at one end of the gluing roller in the longitudinal direction, and a transverse strip protrusion is provided between the two ends of the gluing roller. The circumference of the gluing roller is consistent with the length of the bag body.

[0023] Furthermore, the width of the first adhesive layer is 5-25 mm; the width of the second adhesive layer is 5-15 mm.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0025] 1. The adhesive layer of the packaging bag of the present application has a multi-layer structure, which is more conducive to the adhesion between paper substrates after hot pressing than a single adhesive layer; at the same time, the existence of a structure of fibers and adhesive substances embedded in the adhesive layer further enhances the bonding effect, thereby solving the problem of difficult bonding of paper substrates.

[0026] 2. The paper substrate includes fiber material and adhesive filled around the fiber material. The adhesive forms a cross-linked and solidified network, embedding the fibers in it, thereby greatly increasing the strength of the paper substrate, solving the problem of easy tearing of the paper substrate, and better meeting the packaging, storage, transportation, and handling of paper towel products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of a packaging bag of the present invention;

[0028] FIG2 is a schematic diagram of the bottom of the packaging bag of the present invention;

[0029] FIG3 is a schematic diagram of the adhesive layer structure of the present invention;

[0030] FIG4 is a schematic diagram of a sizing device according to the present invention. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0032] As shown in Figures 1 and 2, the packaging bag body includes a paper base 1; the middle part of the paper base is folded to form an intermediate accommodating portion 2, one end of the intermediate accommodating portion 2 forms a top handle portion 3, and the other end is folded to form a bottom sealing portion 4; an adhesive layer is formed at the folded part of the paper base 1; the top handle portion 3 includes a middle pulling area 5 and two side forming areas 6.

[0033] The paper substrate 1 comprises a fiber material and an adhesive surrounding the fiber material. The fiber material is preferably natural plant fiber, such as wood pulp fiber, cotton fiber, or bamboo pulp fiber. The adhesive includes, but is not limited to, polyurethane and polyacrylate components. The adhesive forms a cross-linked, solidified network, embedding the fibers within it, thereby significantly increasing the strength and cohesiveness of the paper substrate.

[0034] In this embodiment, the paper substrate 1 is made of 100% natural plant fibers, and is formed by mixing polyacrylate and natural plant fibers.

[0035] The middle lifting area 5 includes a reinforcing sheet layer, a first paper layer and a second paper layer in sequence; the material of the reinforcing sheet layer is consistent with the material of the paper base 1, or other materials can be selected according to needs, such as a stiffer material, etc., preferably a degradable material; for easy carrying or taking, the middle lifting area 5 is also provided with a lifting hole 7 for easy lifting.

[0036] The bonding layer comprises a first paper base layer 8, a first composite layer 9, an intermediate bonding layer 10, a second composite layer 11 and a second paper layer 12 in sequence, wherein the first composite layer 9 and the second composite layer 12 comprise fibers and a curing adhesive, the curing adhesive is filled between the fibers, and the first composite layer 9 and the second composite layer 12 are interface layers formed by bonding the paper base 1 and the curing adhesive; the first paper base layer 8 and the second paper base layer 12 are made of the same material as the paper base 1.

[0037] The middle adhesive layer 10 is a degradable curable adhesive layer, and the curable adhesive is preferably polyurethane adhesive, polyacrylate adhesive, etc.

[0038] The adhesive and curing adhesive are made of the same material, preferably acrylate, and the coating amount of the curing adhesive is 3-20 grams per square meter, preferably 5 grams per square meter in this embodiment.

[0039] The paper substrate 1 has a gram weight of 60-150 grams per square meter, preferably 70-130 grams per square meter. In this embodiment, a paper substrate with a gram weight of 70 grams per square meter is selected.

[0040] The adhesive layer provided in the middle receiving portion is a first adhesive layer 13. The width of the first adhesive layer 13 is 5-25 mm, preferably 8-15 mm. In this embodiment, the width of the first adhesive layer 13 is 10 mm. The adhesive layer provided in the bottom sealing area is a second adhesive layer 14. The width of the second adhesive layer 14 is 5-15 mm, preferably 5-10 mm. In this embodiment, the width of the second adhesive layer 14 is 5 mm.

[0041] The method for preparing the bag comprises the following steps:

[0042] (1) Unroll the paper substrate from the film roll and pass it through the conveyor roller to the sizing roller for sizing;

[0043] (2) The paper substrate is glued at a fixed point by a gluing device, and a uniform glue layer is attached to the part where the paper substrate needs to be folded. The glue layer width is 10 mm on the vertical side of the paper substrate, and the glue layer width is 5 mm on the upper end and the bottom sealing part of the bottom of the bag body;

[0044] (3) The paper substrate after gluing enters the folding device, which folds the paper substrate with the glue layer so that the longitudinal sides coated with the glue layer are bonded together, and then is hot-pressed and sealed to form a preliminary cylindrical shape;

[0045] (4) The two sides of the hot-sealed cylinder are passed through an inset machine for inset;

[0046] (5) After completing the inserting, first split the tube, then place the reinforcing sheet on the top handle, and finally heat seal the top handle to complete the sealing of the upper end of the bag;

[0047] (6) After the top handle is sealed, it enters the punching device to punch holes in the top handle to form a handle hole;

[0048] (7) After the items are placed inside the bag, the bottom sealing part is sealed by heat pressing.

[0049] The gluing device includes a glue transfer roller 15, a glue roller 16, and a paper guide roller 17. The glue roller 16 has strip-shaped transverse protrusions and / or longitudinal protrusions distributed longitudinally and transversely. These protrusions are used to receive glue from the glue transfer roller 15 and transfer it to the paper substrate 1. One end of the glue roller is provided with a longitudinal strip-shaped protrusion, and a transverse strip-shaped protrusion is provided between the two ends. The circumference of the glue roller 16 is consistent with the length of the bag. After the glue roller 16 rotates one circle, the transverse strip-shaped protrusions contact the bag, completing the transverse gluing. The glue used for directional gluing is an instant adhesive, preferably a biodegradable acrylate as its main component.

Claims

1. A packaging bag body; comprising a paper base (1), a middle containing portion (2), a top handle portion (3) and a bottom sealing portion (4); characterized in that, The middle accommodating portion (2) has a first adhesive layer (13) arranged vertically, and the bottom sealing portion (4) has a second adhesive layer (14) arranged horizontally; the top handle portion (3) further includes a middle lifting area (5) and two side molding areas (6).

2. The packaging bag according to claim 1, characterized in that: The first adhesive layer (13) and the second adhesive layer (14) have the same structure and both sequentially comprise a first paper base layer (8), a first composite layer (9), an intermediate adhesive layer (10), a second composite layer (11) and a second paper base layer (12).

3. The packaging bag according to claim 2, characterized in that: The materials of the first composite layer (9) and the second composite layer (11) include fibers and a curing adhesive mixed with the fibers; the first paper base layer (8) and the second paper base layer (12) are paper substrates (1), and the intermediate bonding layer (10) is a degradable curing adhesive layer.

4. The packaging bag according to claim 1, characterized in that: The paper substrate (1) comprises fiber material and adhesive filling around the fiber material.

5. The packaging bag according to claim 1, characterized in that: The middle pulling zone (5) comprises in sequence: a reinforcing sheet layer, a first paper layer and a second paper layer; the materials of the first paper layer and the second paper layer include fiber material and adhesive filled around the fiber material.

6. The packaging bag according to claim 1, characterized in that: The width of the first adhesive layer is 5-25 mm; the width of the second adhesive layer is 5-15 mm.

7. The packaging bag according to claim 1, characterized in that: The paper substrate (1) has a grammage of 60-150 grams per square meter.

8. The packaging bag according to claim 1, characterized in that: The middle lifting area (5) is provided with a lifting hole (7) for facilitating lifting.

9. A method for preparing the packaging bag according to any one of claims 1 to 8, characterized in that: The steps include: (1) Unroll the paper substrate from the film roll and pass it through the conveyor roller into the sizing device; (2) The paper substrate is glued at fixed points by a glue-applying device, and a uniform glue layer is applied on the longitudinal sides, top and bottom of the paper substrate; (3) The paper substrate after gluing enters the folding device, which folds the paper substrate with the glue layer so that the longitudinal sides coated with the glue layer are bonded together, and then is hot-pressed and sealed to form a preliminary cylindrical shape; (4) The two sides of the hot-sealed cylinder are passed through an inset machine for inset; (5) After completing the inserting, first split the tube, then place the reinforcing sheet on the top handle, and finally heat seal the top handle to complete the sealing of the upper end of the bag; (6) After the top handle is sealed, it enters the punching device to punch holes on the top handle to form Lift hole; (7) After the items are placed inside the bag, the bottom sealing part is sealed by heat pressing.

10. The preparation method according to claim 9, characterized in that The gluing device comprises a glue transfer roller (15), a gluing roller (16) and a paper guide roller (17); one end of the gluing roller (16) is provided with a strip protrusion in the longitudinal direction, and a transverse strip protrusion is provided between the two ends of the gluing roller (16); the circumference of the gluing roller (16) is consistent with the length of the bag body.

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