Degradable composite paper board blank suitable for carton processing

Abstract

The utility model relates to a degradable composite paper board blank suitable for carton processing, which comprises a base layer straw paperboard, a bamboo fiber layer is distributed on the base layer straw paperboard, a polylactic acid film layer is distributed on the bamboo fiber layer, a starch-based waterproof layer is coated on the polylactic acid film layer, and the starch-based waterproof layer is coated on the starch-based waterproof layer. Adhesive layers are distributed among the base layer straw paperboard, the bamboo fiber layer and the polylactic acid film layer to form a composite laminate structure, the base layer straw paperboard is of a honeycomb composite structure, and the bamboo fiber layer is a net-shaped laminate formed by weaving a plurality of bamboo fiber strips in a crossed mode. Therefore, the configuration of almost full degradation can be realized, after the whole paper box is degraded, the effective degradation within 180 days can be met, and the pulping treatment requirement after the finished paper box is discarded is met. The whole material is mainly made of plant base materials, and the environment-friendly requirement in the manufacturing period is met. And after being processed into the paper box, the paper box can meet the daily supporting and using requirements of the paper box.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of board blank for manufacturing carton, more particularly to a kind of degradable composite paperboard blank suitable for carton processing. BACKGROUND

[0002] In prior art, carton is mainly corrugated paperboard blank processing, which is difficult to achieve complete biodegradation. For example, the patent document CN114990922A provides a kind of high-strength bamboo fiber gray paperboard and its production process, which discloses the scheme of improving the strength of paperboard by bamboo fiber modification, but its adhesive still relies on chemical synthesis component, and microplastic residues may be generated during degradation process. At the same time, in the waterproof treatment of carton, traditional paperboard adopts polyethylene (PE) film coating process, but PE layer is difficult to separate from paper substrate, and the recycling cost is high, and it cannot be naturally degraded. Moreover, for the adhesive used in manufacturing, traditional petroleum-based adhesive (such as EVA) is difficult to degrade.

[0003] For the above problems, the prior art has not effectively solved the contradiction between the strength, waterproofness and processing adaptability of degradable paperboard.

[0004] In view of the above-mentioned defects, the present inventor actively researches and innovates to create a degradable composite paperboard blank suitable for carton processing, so that it has more industrial utilization value. INVENTION CONTENTS

[0005] To solve the above technical problems, the purpose of the present utility model is to provide a degradable composite paperboard blank suitable for carton processing.

[0006] The degradable composite paperboard blank suitable for carton processing of the present utility model comprises a base layer straw paperboard, wherein: the base layer straw paperboard is distributed with a bamboo fiber layer, the bamboo fiber layer is distributed with a polylactic acid film layer, the polylactic acid film layer is coated with a starch-based waterproof layer, and the base layer straw paperboard, bamboo fiber layer and polylactic acid film layer are distributed with an adhesive layer, forming a composite type plywood structure, the base layer straw paperboard is a honeycomb composite structure, and the bamboo fiber layer is a mesh type plywood composed of a plurality of bamboo fiber strips interlaced.

[0007] Further, the degradable composite paperboard blank suitable for carton processing described above, wherein the honeycomb composite structure of the base layer straw paperboard comprises a bottom base paper layer, the bottom base paper layer is distributed with a honeycomb support paper layer, the honeycomb support paper layer is distributed with a top base paper layer, and the two surfaces of the honeycomb support paper layer are respectively bonded with the bottom base paper layer and the top base paper layer through the adhesive layer.

[0008] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the surface of the polylactic acid film layer is pressed with a plurality of rhombic glue containing grooves, the depth of the rhombic glue containing grooves is 0.2-0.5mm, and the interval of the rhombic glue containing grooves is 5-20mm.

[0009] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the depth of the rhombic glue containing grooves is 0.3mm, and the interval of the rhombic glue containing grooves is 15mm.

[0010] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the longitudinal fiber density of the net layer board is 20-30 strands / cm, and the weft fiber density is 15-25 strands / cm.

[0011] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the longitudinal fiber density of the net layer board is 25 strands / cm, and the weft fiber density is 20 strands / cm.

[0012] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the adhesive layer is a plant protein-based adhesive layer, and the thickness of the adhesive layer is 0.2-0.4mm.

[0013] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the thickness of the polylactic acid film layer is 0.5-1.5mm, and the thickness of the starch-based waterproof layer is 0.3-1mm.

[0014] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the thickness of the polylactic acid film layer is 1.2mm, and the thickness of the starch-based waterproof layer is 0.5mm.

[0015] Further, the above-mentioned degradable composite paperboard blank for carton processing, wherein the composite layer board structure is coated with a degradable TPU edge sealing adhesive.

[0016] By the above scheme, the present application has at least the following advantages:

[0017] 1. The configuration can realize almost full degradation, and after the degradation treatment, the whole can meet the effective degradation within 180 days, which meets the need of the broken pulp treatment after the finished carton is discarded.

[0018] 2. The whole material is mainly plant-based material, which meets the environmental protection demand during manufacturing.

[0019] 3. The composite structure has good stability, which meets the daily support use demand after being processed into a carton.

[0020] 4, has moderate waterproof effect, is not easy to be damped and collapse.

[0021] 5, the overall structure is simple, easy to process and manufacture.

[0022] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail below with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is the overall structure diagram of the degradable composite paperboard blank suitable for carton processing.

[0024] Fig. 2 It is the distribution diagram of the composite layer structure.

[0025] Fig. 3 It is the layered diagram of the base straw paperboard.

[0026] Fig. 4 It is the cross-weaving diagram of the bamboo fiber layer.

[0027] Fig. 5 It is the distribution diagram of the diamond-shaped glue containing groove.

[0028] The meanings of various reference signs in the drawings are as follows.

[0029] 1 base straw paperboard 2 bamboo fiber layer

[0030] 3 polylactic acid film layer 4 starch-based waterproof layer

[0031] 5 adhesive layer 6 bottom base material paper layer

[0032] 7 honeycomb-shaped support paper layer 8 top base material paper layer

[0033] 9 diamond-shaped glue containing groove DETAILED DESCRIPTION

[0034] The specific implementation of the utility model will be further described in detail in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0035] As Figs. 1 to 5The application discloses a degradable composite paperboard blank suitable for carton processing, which comprises a base layer straw paperboard 1, and is characterized in that a bamboo fiber layer 2 is distributed on the base layer straw paperboard 1 to improve the tensile resistance; meanwhile, a polylactic acid film layer 3 (PLA) is distributed on the bamboo fiber layer 2 to provide waterproof function; and in order to meet the outdoor or long-time placement in a humid environment, a starch-based waterproof layer 4 is coated on the polylactic acid film layer 3 to enhance the waterproof effect. The starch-based waterproof layer 4 can form a hydrophobic barrier to prevent water penetration. In order to meet the effective combination and integration, an adhesive layer 5 is distributed between the base layer straw paperboard 1, the bamboo fiber layer 2 and the polylactic acid film layer 3 in a coating manner, so that the whole forms a composite laminated structure. During implementation, the base layer straw paperboard 1 has a honeycomb composite structure, has proper deformation resistance effect, and has proper supporting force after being processed into a carton, so that unnecessary collapse is avoided. Furthermore, in order to have better tensile resistance effect and ensure that the carton is not easily torn after processing, the bamboo fiber layer 2 is a meshed layer formed by crossing a plurality of bamboo fiber strips. In this way, uniform stress distribution can be realized during stress, and the tearing resistance is enhanced.

[0036] According to a preferred embodiment of the application, the honeycomb composite structure of the base layer straw paperboard 1 comprises a bottom base paper layer 6, a honeycomb support paper layer 7 is distributed on the bottom base paper layer 6, a top base paper layer 8 is distributed on the honeycomb support paper layer 7, and the two surfaces of the honeycomb support paper layer 7 are respectively bonded to the bottom base paper layer 6 and the top base paper layer 8 through the adhesive layer 5. In this way, the honeycomb support paper layer 7 is used to realize moderate deformation resistance effect, and even if deformation occurs, moderate reset can be realized. Meanwhile, the bottom base paper layer 6 and the top base paper layer 8 are moderately reinforced and consolidated. Of course, for some simple implementation needs, the top base paper layer 8 can be removed, and the bamboo fiber layer 2 is directly used for stacking and connecting.

[0037] Further, in order to increase the adhesion effect of the adhesive layer 5 and moderately increase the contact area, a plurality of rhombic glue grooves 9 are pressed on the surface of the polylactic acid film layer 3, the depth of the rhombic glue grooves 9 is 0.2-0.5 mm, and the spacing of the rhombic glue grooves 9 is 5-20 mm. During preparation, the depth of the rhombic glue grooves 9 is preferably 0.3 mm, and the spacing of the rhombic glue grooves 9 is 15 mm. In this way, the commercially available environment-friendly glue solution can be directly sprayed on the surface with the rhombic glue grooves 9 to form the adhesive layer 5.

[0038] According to actual implementation, the warp fiber density of the meshed layer is 20-30 per cm, and the weft fiber density is 15-25 per cm, so that the tensile resistance effect during daily use is met. For the application of conventional packaging cartons, the warp fiber density of the meshed layer is 25 per cm, and the weft fiber density is 20 per cm, so that the daily use needs are met.

[0039] Further, considering the need for stable bonding and meeting the degradable requirement after disposal, the adhesive layer 5 is a plant protein-based adhesive layer, and the thickness of the adhesive layer 5 is 0.2-0.4 mm. Even if the processing equipment of waste paperboard and cartons is introduced, the degradation treatment will not be affected.

[0040] In combination with the moderate waterproofing requirement of the carton in the daily environment, the thickness of the polylactic acid film layer 3 is 0.5-1.5 mm, and the thickness of the starch-based waterproof layer 4 is 0.3-1 mm. At the same time, in view of the conventional humidity evaluation of the placement environment, the thickness of the polylactic acid film layer 3 is 1.2 mm, and the thickness of the starch-based waterproof layer 4 is 0.5 mm, which is sufficient to meet the daily use requirement.

[0041] Further, the utility model discloses a compound type layer board structure is coated with degradable TPU edge bonding glue (not shown in the drawing) outside. In this way, moderate edge bonding can be realized, and if a simple folding mode is used to form a carton, then the edge of each layer can be prevented from being separated from the glue.

[0042] The working principle of the utility model is as follows:

[0043] The carton can be processed by conventional carton processing equipment, and is similar to a normal carton during daily use, and has moderate deformation resistance and waterproof effect.

[0044] When it is discarded, it can enter the degradation process. Specifically, the base layer of straw paperboard 1 can be degraded by cellulase under composting conditions. The bamboo fiber layer 2 forms soluble sugars after hydrolysis. The polylactic acid (PLA) film layer 3 can also be degraded in the environment of industrial composting or degradation site. At the same time, the starch-based waterproof layer 4 can be hydrolyzed in the degradation site. In addition, the adhesive layer 5 and the TPU edge bonding glue can also be degraded by composting. Therefore, the whole meets the requirement of complete dissociation in the conventional pulper. Through the above text description and in combination with the drawings, it can be seen that after adopting the utility model, the following advantages are obtained:

[0045] 1. The configuration can realize almost complete degradation, and the whole can meet the effective degradation within 180 days after degradation treatment, which meets the pulping treatment requirement after disposal of the finished carton.

[0046] 2. The whole material is mainly plant-based material, which meets the environmental protection requirement during manufacturing.

[0047] 3. It has better composite structure stability, and meets the daily support use requirement after being processed into a carton.

[0048] 4. It has moderate waterproof effect and is not easy to be damped and collapsed.

[0049] 5. The whole structure is simple, and is convenient for processing and manufacturing.

[0050] In addition, the indicated direction or position relationship described in the utility model is based on the direction or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or structure must have a specific direction or be operated in a specific direction, so it cannot be understood as a limitation on the utility model.

[0051] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, on the premise of not departing from the technical principle of the utility model, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection range of the utility model.

Claims

1. A biodegradable composite paperboard blank suitable for cardboard box processing, comprising a base layer of straw paperboard (1), characterized in that: The base straw paperboard (1) has a bamboo fiber layer (2) distributed on it, a polylactic acid film layer (3) distributed on it, a starch-based waterproof layer (4) coated on it, and an adhesive layer (5) distributed between the base straw paperboard (1), the bamboo fiber layer (2), and the polylactic acid film layer (3), forming a composite layer structure. The base straw paperboard (1) is a honeycomb composite structure, and the bamboo fiber layer (2) is a mesh layer formed by several bamboo fiber strips woven together.

2. The biodegradable composite cardboard preform suitable for carton processing according to claim 1, characterized in that: The honeycomb composite structure of the base straw paperboard (1) includes a bottom substrate paper layer (6), a honeycomb support paper layer (7) distributed on the bottom substrate paper layer (6), a top substrate paper layer (8) distributed on the honeycomb support paper layer (7), and the two sides of the honeycomb support paper layer (7) are respectively bonded to the bottom substrate paper layer (6) and the top substrate paper layer (8) through an adhesive layer (5).

3. The biodegradable composite cardboard preform suitable for carton processing according to claim 1, characterized in that: The surface of the polylactic acid film layer (3) is pressed with a plurality of rhombic rubber grooves (9), the depth of the rhombic rubber grooves (9) is 0.2 to 0.5 mm, and the spacing of the rhombic rubber grooves (9) is 5 to 20 mm.

4. The biodegradable composite cardboard preform suitable for carton processing according to claim 3, characterized in that: The depth of the rhomboid-shaped rubber groove (9) is 0.3 mm, and the spacing between the rhomboid-shaped rubber grooves (9) is 15 mm.

5. The biodegradable composite cardboard preform suitable for carton processing according to claim 1, characterized in that: The warp fiber density of the mesh layer is 20 to 30 fibers / cm, and the weft fiber density is 15 to 25 fibers / cm.

6. The biodegradable composite cardboard preform suitable for carton processing according to claim 5, characterized in that: The warp fiber density of the mesh layer is 25 fibers / cm, and the weft fiber density is 20 fibers / cm.

7. The biodegradable composite paperboard preform suitable for carton processing according to claim 1, characterized in that: The adhesive layer (5) is a plant protein-based adhesive layer, and the thickness of the adhesive layer (5) is 0.2 to 0.4 mm.

8. The biodegradable composite cardboard preform suitable for carton processing according to claim 1, characterized in that: The thickness of the polylactic acid film layer (3) is 0.5 to 1.5 mm; the thickness of the starch-based waterproof layer (4) is 0.3 to 1 mm.

9. The biodegradable composite cardboard preform suitable for carton processing according to claim 8, characterized in that: The polylactic acid film layer (3) has a thickness of 1.2 mm; the starch-based waterproof layer (4) has a thickness of 0.5 mm.

10. The biodegradable composite paperboard preform suitable for carton processing according to claim 1, characterized in that: The composite laminate structure is coated with biodegradable TPU edge-sealing adhesive.

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