Heat-sealing reinforced high-strength waterproof and moistureproof paper-plastic composite packaging bag

Abstract

The utility model belongs to the field of paper-plastic composite packaging bags, and particularly relates to a heat-seal reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag which comprises a packaging bag body, the packaging bag body comprises kraft paper, a waterproof and moisture-proof layer and a heat-seal reinforced layer, the waterproof and moisture-proof layer is arranged on the inner layer of the kraft paper, and the heat-seal reinforced layer is arranged on the outer side of the kraft paper. The waterproof and damp-proof layer comprises a super-hydrophobic outer layer, a first waterproof barrier layer, a damp-proof buffer layer, a second waterproof barrier layer and a bonding inner layer, the first waterproof barrier layer is arranged on the side, close to the kraft paper, of the super-hydrophobic outer layer, and the damp-proof buffer layer is arranged on the side, close to the kraft paper, of the first waterproof barrier layer. The waterproof and moistureproof packaging film is reasonable in design, and through the matching of the waterproof and moistureproof layer and the heat-sealing strengthening layer, the waterproof and moistureproof packaging film is excellent in waterproof and moistureproof performance, high in reliability of a heat-sealing part, capable of adapting to various packaging requirements, firm in structure and capable of effectively protecting products, prolonging the quality guarantee period and guaranteeing the stability in the using process.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper plastic composite packaging bag technical field especially relates to a heat sealing reinforced high strength waterproof and moistureproof paper plastic composite packaging bag. BACKGROUND

[0002] In the packaging field, paper plastic composite packaging bag is widely used because of the advantages of paper and plastic. However, the existing paper plastic composite packaging bag still has some deficiencies in heat sealing strength, waterproof and moistureproof performance and overall strength. For example, the heat sealing part of the ordinary paper plastic composite packaging bag is prone to cracking and peeling of the heat sealing layer when subjected to a large external force or in a harsh environment, resulting in loss of the sealing property of the packaging bag and damage to the internal goods due to the influence of the external environment.

[0003] At the same time, in terms of waterproof and moistureproof performance, the existing waterproof and moistureproof effect cannot meet the requirements of long-term storage and transportation for some humidity-sensitive products. In addition, the packaging bag is prone to damage during handling and stacking due to insufficient strength, reducing the reliability of the packaging. Therefore, we propose a heat sealing reinforced high strength waterproof and moistureproof paper plastic composite packaging bag to solve the above problems. SUMMARY

[0004] The utility model discloses a heat sealing reinforced high strength waterproof and moistureproof paper plastic composite packaging bag to solve the above problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A heat sealing reinforced high strength waterproof and moistureproof paper plastic composite packaging bag, comprising a packaging bag body, the packaging bag body comprises kraft paper, a waterproof and moistureproof layer and a heat sealing reinforcement layer, the waterproof and moistureproof layer is arranged on the inner layer of the kraft paper, and the heat sealing reinforcement layer is arranged on the outer side of the kraft paper.

[0007] The waterproof and moistureproof layer comprises a super-hydrophobic outer layer, a first waterproof barrier layer, a moistureproof buffer layer, a second waterproof barrier layer and a bonding inner layer, the super-hydrophobic outer layer is provided with the first waterproof barrier layer on the side close to the kraft paper, the first waterproof barrier layer is provided with the moistureproof buffer layer on the side close to the kraft paper, the moistureproof buffer layer is provided with the second waterproof barrier layer on the side close to the kraft paper, and the second waterproof barrier layer is provided with the bonding inner layer connected with the kraft paper on the side close to the kraft paper.

[0008] Preferably, the heat-seal reinforced layer comprises a first toughening layer, a heat-seal resin main layer, a reinforcing fiber dispersion layer, a second toughening layer and a surface tackifying layer, the first toughening layer is mounted on kraft paper, one side of the first toughening layer is connected with the heat-seal resin main layer, one side of the heat-seal resin main layer is connected with the reinforcing fiber dispersion layer, one side of the reinforcing fiber dispersion layer is connected with the second toughening layer, and one side of the second toughening layer is connected with the surface tackifying layer.

[0009] Preferably, the first waterproof barrier layer is made of high-density polyethylene film, and the super-hydrophobic outer layer is made of nano-silica modified polytetrafluoroethylene coating.

[0010] Preferably, the moisture-proof buffer layer is made of a plurality of layers of wood pulp fibers interwoven, and the interstitial spaces of the fibers are filled with montmorillonite desiccant.

[0011] Preferably, the bonding inner layer adopts polyurethane adhesive, and the thickness of the bonding inner layer is 0.05-0.08mm.

[0012] Preferably, the first toughening layer is made of ethylene-vinyl acetate copolymer mixed with plasticizer.

[0013] Preferably, the heat-seal resin main layer is made of polyethylene resin and polypropylene resin.

[0014] Preferably, the reinforcing fiber dispersion layer comprises thermoplastic elastomer, and the thermoplastic elastomer is filled with polyester fibers and glass fibers.

[0015] The utility model discloses the beneficial effect of the following:

[0016] 1. It has the performance of heat-seal reinforcement, and the layers of the multi-layer heat-seal reinforced layer cooperate with each other to improve the comprehensive performance of the heat-seal part from the bonding toughness, resin performance optimization, fiber strength enhancement to surface tackiness, effectively prevent the heat-seal layer from cracking and peeling, greatly improve the heat-seal strength and sealing performance of the packaging bag, and ensure the safety of the internal goods.

[0017] 2. It has excellent waterproof and moisture-proof performance, and the multi-layer design of the waterproof and moisture-proof layer forms a comprehensive and multi-level waterproof and moisture-proof system from the surface protection of super-hydrophobicity, multi-layer waterproof barrier and moisture-proof buffer. It can effectively block the intrusion of external water vapor, meet the long-term storage and transportation requirements of humidity-sensitive products, prolong the shelf life of the products and ensure the product quality.

[0018] 3、Specific overall high strength performance, the reasonable design and material selection of heat sealing reinforcement layer and waterproof and moisture-proof layer not only play their main functions, but also contribute to improving the overall strength of the packaging bag. The packaging bag can withstand greater external force during handling and stacking, is not easy to be damaged, enhances the reliability of the packaging, and reduces the loss risk of the product during packaging, transportation and storage. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A perspective structural schematic view of a heat sealing reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag is provided for the utility model.

[0020] Figure 2 A cross-sectional structural schematic view of a heat sealing reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag is provided for the utility model.

[0021] Figure 3 A cross-sectional structural schematic view of a waterproof and moisture-proof layer of a heat sealing reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag is provided for the utility model.

[0022] Figure 4 A cross-sectional structural schematic view of a heat sealing reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag is provided for the utility model.

[0023] In the figure: 1, packaging bag body; 2, kraft paper; 3, waterproof and moisture-proof layer; 31, super-hydrophobic outer layer; 32, first waterproof barrier layer; 33, moisture-proof buffer layer; 34, second waterproof barrier layer; 35, adhesive inner layer; 4, heat sealing reinforcement layer; 41, first toughening layer; 42, heat sealing resin main layer; 43, reinforcing fiber dispersion layer; 44, second toughening layer; 45, surface tackifying layer. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings Figures 1-4 The application is further described in detail.

[0025] The application embodiment discloses a heat sealing reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag.

[0026] Referring to Figures 1-4A heat-sealed reinforced high-strength waterproof and moisture-proof paper-plastic composite packaging bag includes a packaging bag body 1. The packaging bag body 1 includes kraft paper 2, a waterproof and moisture-proof layer 3, and a heat-sealing reinforced layer 4. The waterproof and moisture-proof layer 3 is disposed on the inner layer of the kraft paper 2, and the heat-sealing reinforced layer 4 is disposed on the outer layer of the kraft paper 2. The waterproof and moisture-proof layer 3 includes a superhydrophobic outer layer 31, a first waterproof barrier layer 32, a moisture-proof buffer layer 33, a second waterproof barrier layer 34, and an adhesive inner layer 35. The superhydrophobic outer layer 31 has the first waterproof barrier layer 32 on the side closest to the kraft paper 2. The first waterproof barrier layer 32 has the moisture-proof buffer layer 33 on the side closest to the kraft paper 2. The moisture-proof buffer layer 33 has the second waterproof barrier layer 34 on the side closest to the kraft paper 2. The second waterproof barrier layer 34 has an adhesive inner layer 35 connected to the kraft paper 2 on the side closest to the kraft paper 2.

[0027] In this embodiment, the heat-sealing reinforcing layer 4 includes a first toughening layer 41, a heat-sealing resin main layer 42, a reinforcing fiber dispersion layer 43, a second toughening layer 44, and a surface tackifying layer 45. The first toughening layer 41 is mounted on the kraft paper 2. The heat-sealing resin main layer 42 is connected to one side of the first toughening layer 41. The reinforcing fiber dispersion layer 43 is connected to one side of the heat-sealing resin main layer 42. The second toughening layer 44 is connected to one side of the reinforcing fiber dispersion layer 43, and the surface tackifying layer 45 is connected to one side of the second toughening layer 44. This structural design enables the various parts of the heat-sealing reinforcing layer 4 to work synergistically, from enhancing toughness, providing a heat-sealing foundation, strengthening strength to increasing surface tack, comprehensively improving the overall performance of the heat-sealed part of the packaging bag, and greatly improving the quality and reliability of the heat-sealed part of the packaging bag.

[0028] In this embodiment, the first waterproof barrier layer 32 is a high-density polyethylene film, and the superhydrophobic outer layer 31 is a polytetrafluoroethylene coating modified with nano-silica. The high-density polyethylene film has good waterproof performance, while the polytetrafluoroethylene coating modified with nano-silica imparts superhydrophobic properties. The combination of the two can effectively block the intrusion of external moisture, providing excellent waterproof protection for the items inside the bag, and is particularly suitable for product packaging in humid environments.

[0029] In this embodiment, the moisture-proof buffer layer is made of multiple layers of interwoven wood pulp fibers, with montmorillonite desiccant filling the gaps between the fibers. The multi-layered interwoven wood pulp fiber structure provides a certain mechanical strength, while the montmorillonite desiccant absorbs moisture inside the packaging bag, achieving a moisture-proof function and ensuring that the items inside the bag are stored in a relatively dry environment, effectively extending the product's shelf life.

[0030] In this embodiment, the adhesive inner layer 35 is made of polyurethane adhesive, and the thickness of the adhesive inner layer 35 is set to 0.05-0.08mm. The polyurethane adhesive has excellent adhesive properties, and the appropriate thickness can ensure firm adhesion with the kraft paper 2 and will not affect the stability of the overall structure, ensuring that the waterproof and moisture-proof layer 3 is tightly combined with the kraft paper 2, and enhancing the firmness of the overall structure of the packaging bag.

[0031] In this embodiment, the first toughening layer 41 is made of ethylene-vinyl acetate copolymer mixed with plasticizer. After the ethylene-vinyl acetate copolymer is mixed with the plasticizer, the first toughening layer 41 has good flexibility and adhesive properties, which can effectively improve the bonding effect of the base layer and the heat-sealing resin main layer 42, avoid delamination phenomenon during the heat-sealing process, and improve the initial bonding strength of the heat-sealing part.

[0032] In this embodiment, the heat-sealing resin main layer 42 is made of polyethylene resin and polypropylene resin. By adjusting the ratio of polyethylene and polypropylene, the flexibility, hardness and thermal stability of the heat-sealing resin main layer 42 can be flexibly changed to meet the diversified needs of heat-sealing performance for different product packaging, significantly enhancing the applicability of the packaging bag in various application scenarios.

[0033] In this embodiment, the reinforced fiber dispersion layer 43 includes thermoplastic elastomer, and the thermoplastic elastomer is filled with polyester fiber and glass fiber. The polyester fiber and glass fiber filled in the thermoplastic elastomer greatly enhance the tensile strength and tear resistance of the heat-sealing part, so that the packaging bag can withstand greater external force without damage during handling, storage and other processes, effectively ensuring the sealing performance of the packaging bag.

[0034] The utility model discloses, through being provided with waterproof and moistureproof layer 3, through being provided with super water repellent outer layer 31, can reduce the adhesion of outside liquid on the surface of packing bag, effectively prevent the penetration caused by liquid long -time contact, through first waterproof barrier layer 32 as main waterproof barrier, effectively block most outside liquid water's invasion, has provided reliable waterproof protection for internal article, reduced the risk of product damage because of waterlogging, especially suitable for the product packaging of moisture sensitivity, through moisture buffer layer 33 can absorb trace water vapor to realize the function of moisture -proof, also can buffer external impact force, protect internal structure from being destroyed, finally, second waterproof barrier layer 34 further blocks water vapor penetration, through being provided with heat sealing reinforcement layer 4, through first toughening layer 41 improves the cohesive tenacity of base layer and heat sealing resin main layer 42, prevents the base layer and heat sealing layer separation in heat sealing process, provides good initial bond strength for heat sealing reinforcement layer 4, improves the reliability of heat sealing position, because of being provided with heat sealing resin main layer 42, by adjusting the proportion of polyethylene and polypropylene, can satisfy the diversification demand of different products to heat sealing layer flexibility, hardness and thermal stability, enhances the applicability of packing bag under different application scenarios, through strong fibre dispersion layer, greatly enhances the tensile strength and tear resistance of heat sealing position, effectively improves the stability of heat sealing position when under stress, makes packing bag in the process of handling, storage, heat sealing position is not easy to damage because of external force, guarantees the sealing property of packing bag, finally through second toughening layer 44, reduces the risk of crack of heat sealing layer in the process of bending, and the first toughening layer 41 cooperates and improves the flexibility and fatigue resistance of heat sealing layer, prolongs the service life of heat sealing position, ensures the stability of heat sealing performance of packing bag in the long-term use.

[0035] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A heat-seal reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag, characterized in that, The package bag body (1) comprises kraft paper (2), a waterproof and moisture-proof layer (3) and a heat-sealing reinforced layer (4), the waterproof and moisture-proof layer (3) is arranged on the inner layer of the kraft paper (2), and the heat-sealing reinforced layer (4) is arranged on the outer side of the kraft paper (2). The waterproof and moisture-proof layer (3) comprises a super-hydrophobic outer layer (31), a first waterproof barrier layer (32), a moisture-proof buffer layer (33), a second waterproof barrier layer (34) and a bonding inner layer (35), the super-hydrophobic outer layer (31) is provided with the first waterproof barrier layer (32) on one side close to the kraft paper (2), the first waterproof barrier layer (32) is provided with the moisture-proof buffer layer (33) on one side close to the kraft paper (2), the moisture-proof buffer layer (33) is provided with the second waterproof barrier layer (34) on one side close to the kraft paper (2), and the second waterproof barrier layer (34) is provided with the bonding inner layer (35) connected with the kraft paper (2) on one side close to the kraft paper (2).

2. A heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 1, characterized in that, The heat-sealing reinforced layer (4) comprises a first toughening layer (41), a heat-sealing resin main layer (42), a reinforcing fiber dispersion layer (43), a second toughening layer (44) and a surface tackifying layer (45), the first toughening layer (41) is arranged on the kraft paper (2), one side of the first toughening layer (41) is connected with the heat-sealing resin main layer (42), one side of the heat-sealing resin main layer (42) is connected with the reinforcing fiber dispersion layer (43), one side of the reinforcing fiber dispersion layer (43) is connected with the second toughening layer (44), and one side of the second toughening layer (44) is connected with the surface tackifying layer (45).

3. The heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 1, characterized in that, The first waterproof barrier layer (32) is a high-density polyethylene film, and the super-hydrophobic outer layer (31) is a nano-silica modified polytetrafluoroethylene coating.

4. The heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 1, characterized in that, The moisture-proof buffer layer (33) is formed by interweaving multiple layers of wood pulp fibers, and the interstitial spaces of the fibers are filled with montmorillonite desiccant.

5. The heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 1, characterized in that, The bonding inner layer (35) is made of polyurethane adhesive, and the thickness of the bonding inner layer (35) is 0.05-0.08 mm.

6. A heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 2, characterized in that, The first toughening layer (41) is made of a mixture of ethylene-vinyl acetate copolymer and plasticizer.

7. A heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 2, characterized in that, The heat-sealing resin main layer (42) is made of a blend of polyethylene resin and polypropylene resin.

8. The heat-sealed reinforced high strength waterproof and moisture-proof paper-plastic composite packaging bag according to claim 2, characterized in that, The reinforcing fiber dispersion layer (43) comprises a thermoplastic elastomer, and the thermoplastic elastomer is filled with polyester fibers and glass fibers.

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