Multilayer barrier, air-permeable and moisture-proof filling bag

Abstract

A multilayer barrier, air-permeable and moisture-proof filling bag, comprising an outer bag (1) and an inner bag (2). A barrier layer (3) is provided between the outer bag (1) and the inner bag (2), and air-permeable holes (4) are formed in the outer bag (1) and the inner bag (2) in a staggered manner. The filling bag solves the problems of air permeability, seepage prevention and moisture resistance.

Description

Multi-layer barrier breathable moisture-proof filling bag TECHNICAL FIELD

[0001] The present application belongs to the technical field of packaging bag design, and particularly relates to a multi-layer barrier breathable moisture-proof filling bag. BACKGROUND

[0002] With the application of full-automatic filling equipment, the valve bag is used to contain materials, especially superfine materials such as powder, and the powder material filling needs to be fed through gas cooperation to realize precise and efficient filling requirements. However, after the filling material packaging is completed, a large amount of residual gas remains in the packaging bag, which easily leads to damage during transportation and stacking in the later stage, affecting production efficiency. Therefore, the packaging bag needs to have a certain gas permeability function. At present, a bag body with a gas permeation port is commonly used. However, for materials that are easily passively absorbed moisture or strongly absorbed moisture, such a packaging bag with gas permeability easily leads to moisture absorption and pollution of the materials, thereby affecting the quality of the materials and hindering the development of full-automatic powder filling. In the prior art, a two-layer bag body (an inner PE bag and an outer paper bag or PP bag) is designed, and the inner PE bag is provided with a gas permeation hole. Although this structure has good gas permeability, the anti-seepage (barrier) and moisture-proof (sealing) performances are poor. Therefore, a high-performance filling bag that simultaneously solves the problems of anti-seepage, moisture-proof, and gas permeability is a key research content in the field worldwide. On the basis of the prior art, we have designed a double-layer PE bag and a structure in which holes are punched in a staggered manner on the double-layer PE bag. The moisture-proof performance of the double-layer PE bag is relatively excellent, but the gas permeability and powder blocking performances are poor. Because the PE material is mirror-faced, it has adhesion. Due to the internal pressure, the inner layer of the outer bag and the outer layer of the inner bag are pressed against each other, the gas permeation channel and the gas permeation hole are closed, and the gas permeability is poor. During filling, due to the large impact pressure, the material is impacted by the pressure and leaks out of the bag body from the gas permeation hole, resulting in poor powder blocking performance and the possibility of material leakage and pollution. Therefore, we need to further research and design a filling bag that is excellent in anti-seepage, moisture-proof, and gas permeability. SUMMARY

[0003] The present application aims to overcome the deficiencies of the prior art and provide a multi-layer barrier breathable moisture-proof filling bag.

[0004] In order to achieve the above-mentioned purpose, the technical solution provided by the present application is as follows:

[0005] The multi-layer barrier breathable moisture-proof filling bag comprises an outer bag (1) and an inner bag (2), and a barrier layer (3) is arranged between the outer bag (1) and the inner bag (2). The outer bag (1) and the inner bag (2) are provided with gas permeation holes (4) in a staggered manner.

[0006] Preferably, the outer bag (1) and the inner bag (2) are both PE bags, and the barrier layer (3) is made of PE or PP fibrous material (apparent similar non-woven fabric, different materials are selected according to different barrier levels).

[0007] More preferably, the barrier layer (3) is a non-woven fabric layer.

[0008] Preferably, a plurality of air vents (4) are arranged at the middle of the inner bag (2), and a plurality of air vents (4) are arranged at the two side edges of the outer bag (1).

[0009] The present application is further described below:

[0010] In the present application, the two-layer PE bag is perforated in a staggered manner, similar to a labyrinth air passage. When filling the material, the air in the bag is discharged from the middle perforation position of the inner bag to the double-side perforation position of the outer bag through the barrier layer (material barrier layer) between the double-layer bag. The pressure outside the bag is less than that inside the bag, so the external air and moisture cannot enter the bag in the opposite direction. Moreover, because the air vents are staggered, the external and internal air cannot flow freely. In this structure, the air and moisture can only be discharged and entered through a relatively complex path (see Figure 2, the gas passage is formed between the inner layer, the barrier layer, and the outer layer, which is a detour), which is different from the straight-through and straight-discharge mode of the paper-plastic composite bag and the PP woven bag. Therefore, the structure of the present application reduces the possibility of moisture while ensuring ventilation. Moreover, because the middle barrier layer is designed, i.e., the PE+barrier material+PE structure, the middle barrier material is fluffy and fibrous, which forms a certain thickness of cushioning between the outer PE and the innermost PE, and does not cause the inner bag outer layer and the outer bag inner layer to adhere. When filling, the ventilation channel is not closed, and the material does not leak out of the bag due to the impact pressure.

[0011] After the material is filled, the inner bag perforation position is pressed on the barrier layer by the material in the bag, and the position of the barrier layer corresponds to the inner wall without perforation of the outer bag, thereby achieving self-sealing, effectively preventing air flow, effectively preventing external moisture and foreign matter, and achieving the effect of preventing moisture.

[0012] In addition, after the filling bags are filled, they need to be stacked. After stacking, the multiple filling bags are pressed against each other, achieving secondary sealing. Because the perforations are staggered, the air between the inner bag, the barrier layer, and the outer bag can be discharged, making the stack more perfect and preventing the situation of bag explosion and sliding.

[0013] In summary, by using the inner PE bag and the outer PE bag and setting the barrier layer in the middle, the present application perfectly solves the problems of ventilation, anti-seepage, and moisture prevention of the filling bag. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the cross-sectional structure of the present application;

[0015] Figure 2 is a schematic diagram of the ventilation principle of the structure of the present application;

[0016] Figure 3 is a performance comparison chart of the present application and other existing designs.

[0017] In the figure: 1, outer bag; 2, inner bag; 3, barrier layer; 4, air hole. DETAILED DESCRIPTION Example 1

[0018] Referring to Figures 1 and 2, the multi-layer barrier air-permeable moisture-proof filling bag includes an outer bag 1 and an inner bag 2, and a barrier layer 3 is arranged between the outer bag 1 and the inner bag 2; air holes 4 are arranged on the outer bag 1 and the inner bag 2 in a staggered manner.

[0019] Among them, the outer bag 1 and the inner bag 2 are both PE bags, the barrier layer 3 is a PE or PP fibrous material layer, preferably a non-woven fabric layer. A plurality of air holes 4 are arranged at the middle position of the inner bag 2, and a plurality of air holes 4 are arranged at the side positions of the outer bag 1.

[0020] Referring to Figure 3, the multi-layer barrier air-permeable moisture-proof filling bag (three layers of PE+barrier+PE multi-layer staggered hole valve bag) of the present application is compared with two / three layers of full paper air-permeable valve bag, two / three layers of paper+one film air-permeable valve bag in terms of sealing and moisture-proof, air-permeable, anti-seepage, environmental protection and cost performance. It can be seen that the present application has reached an excellent degree in sealing and moisture-proof, anti-seepage, environmental protection and cost performance, and is close to excellent degree in air-permeable, while other existing results have their own short boards, and even poor performance in some aspects. Therefore, the comprehensive performance of the present application is far superior to the prior art.

Claims

1. A multi-layer barrier, breathable, and moisture-proof filling bag, characterized in that, The multi-layer barrier breathable moisture-proof filling bag includes an outer bag (1) and an inner bag (2), with a barrier layer (3) between the outer bag (1) and the inner bag (2); and air vents (4) are provided on the outer bag (1) and the inner bag (2) in a staggered manner.

2. The multi-layer barrier, breathable, and moisture-proof filling bag as described in claim 1, characterized in that, Both the outer bag (1) and the inner bag (2) are PE bags, and the barrier layer (3) is a PE or PP fibrous material layer.

3. The multi-layer barrier, breathable, and moisture-proof filling bag as described in claim 2, characterized in that, The barrier layer (3) is a non-woven fabric layer.

4. The multi-layer barrier, breathable, and moisture-proof filling bag as described in claim 1, characterized in that, The inner bag (2) has multiple ventilation holes (4) in the middle and the outer bag (1) has multiple ventilation holes (4) on both sides.

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