Oxygen-isolating water-blocking type flexible plastic bag

Abstract

The utility model discloses an oxygen-isolating and water-blocking type flexible plastic bag, and belongs to the technical field of plastic bags, the oxygen-isolating and water-blocking type flexible plastic bag comprises a plastic bag body, when the oxygen-isolating and water-blocking type flexible plastic bag is used, LDPE of the inner layer provides basic flexibility and a smooth surface of the bag, and objects can be conveniently placed and taken out; the molecular chain of the PA6 in the middle layer contains a large number of polar groups, so that oxygen permeation can be effectively blocked, and the purpose of oxygen isolation is achieved; the EVA on the outer layer has good waterproof performance, can effectively prevent external moisture from entering the bag, and also has good heat sealing performance, so that the sealing effect is ensured; the three layers of materials are combined to form a multifunctional protective barrier, the overall performance of the plastic bag is comprehensively improved, and the three layers of materials are formed at a time through a co-extrusion technology to form an overall film structure. The structure not only ensures good oxygen insulation and waterproof performance, but also has higher mechanical strength and durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic bags, in particular to an oxygen-barrier and water-barrier flexible plastic bag. BACKGROUND

[0002] Currently, most plastic bags on the market are made of single material, which has certain flexibility and transparency, but has obvious shortcomings in oxygen barrier and water resistance. With the improvement of consumers' quality requirements for products, there is an urgent need for plastic bags that have good mechanical strength and excellent oxygen barrier and water resistance. Single-layer PE plastic bags: although the cost is low, the oxygen barrier and water resistance are poor, and the internal goods are easily damaged due to environmental factors; multi-layer composite film plastic bags: by compounding different materials together, the oxygen barrier and water resistance are improved, but the production process is complex, the cost is high, and there are difficulties in recycling; plastic bags containing EVOH (ethylene-vinyl alcohol copolymer): EVOH has good oxygen barrier performance, but is sensitive to humidity and easily absorbs moisture, which limits its scope of application.

[0003] These traditional plastic bags have their own advantages, but also have obvious limitations, such as single-layer PE plastic bags cannot meet the high demand for moisture resistance, multi-layer composite film plastic bags have high production costs, and EVOH plastic bags are greatly affected by humidity.

[0004] The existing various plastic bags either have poor oxygen barrier performance, or have poor water resistance, or have high cost, which is difficult to promote on a large scale; in addition, many plastic bags also have problems in environmental protection, such as not easy to degrade or difficult to recycle, which limits their application range and development prospects. CONTENT OF THE INVENTION

[0005] In view of the shortcomings of the prior art, the present application provides an oxygen-barrier and water-barrier flexible plastic bag, which overcomes the shortcomings of the prior art and aims to solve the problem that the existing various plastic bags in the prior art either have poor oxygen barrier performance, or have poor water resistance, or have high cost, which is difficult to promote on a large scale; in addition, many plastic bags also have problems in environmental protection, such as not easy to degrade or difficult to recycle, which limits their application range and development prospects.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an oxygen-barrier and water-barrier flexible plastic bag, comprising a plastic bag body, the inside of the plastic bag body comprises a middle layer, the outer side and the inner side of the middle layer are respectively provided with an outer layer and an inner layer, the material of the inner layer is LDPE, and the thickness of the outer layer is 0.05mm; the material of the middle layer is PA6, the thickness of the middle layer is 0.08mm, the material of the outer layer is EVA, and the thickness of the middle layer is 0.1mm.

[0007] By adopting the technical scheme, the inner layer of LDPE provides basic flexibility and smooth surface of the bag, facilitating the placement and taking out of the articles; the middle layer of PA6 can effectively block oxygen transmission due to the large number of polar groups in the molecular chain, thereby achieving the purpose of oxygen isolation; the outer layer of EVA has good waterproof performance, which can effectively prevent external moisture from entering the bag, and also has good heat sealing performance, ensuring the sealing effect; the three layers form a multifunctional protective barrier, comprehensively improving the overall performance of the plastic bag; the three layers are integrally formed by a one-time co-extrusion process to form an integral film structure; the structure not only guarantees good oxygen isolation and waterproof performance, but also has high mechanical strength and durability.

[0008] As a preferred technical scheme of the present application, the plastic bag body is internally provided with a reinforcing rib, the reinforcing rib internally includes transverse fibers and longitudinal fibers, and a plurality of groups of the transverse fibers and a plurality of groups of the longitudinal fibers are arranged in cross.

[0009] By adopting the technical scheme, the reinforcing rib can further improve the overall load-bearing performance of the plastic bag body, and can make the force transmission more uniform during load-bearing, further improve the overall structural strength, and improve the stability during use.

[0010] As a preferred technical scheme of the present application, the outer layer is externally provided with a nano coating composed of silicon dioxide nanoparticles.

[0011] By adopting the technical scheme, the nano coating composed of silicon dioxide nanoparticles is uniformly coated on the outer layer, which can not only enhance the waterproof performance, but also improve the ultraviolet resistance and prolong the service life of the plastic bag.

[0012] As a preferred technical scheme of the present application, the inner side of the inner layer is provided with an antibacterial layer, which is specifically a silver ion antibacterial agent.

[0013] By adopting the technical scheme, the antibacterial layer can make the interior of the plastic bag body have the function of sterilization and disinfection, which is particularly suitable for packaging of food and medical supplies.

[0014] As a preferred technical scheme of the present application, the plastic bag body is internally provided with two groups of sealing strips, and the two groups of sealing strips are matched with each other.

[0015] By adopting the technical scheme, the sealing strips can quickly complete the sealing effect of the interior of the plastic bag body during use, improving the convenience during use.

[0016] As a preferred technical solution of the present application, the inside of the plastic bag body is provided with a hollow groove, and the inside of the hollow groove is provided with a sleeve ring.

[0017] By adopting the above technical solution, by setting the sleeve ring, the plastic bag body can be conveniently lifted as a whole during use, improving the overall practicality.

[0018] As a preferred technical solution of the present application, the outside of the plastic bag body is provided with an ultraviolet-proof layer, which is specifically titanium dioxide reflectant.

[0019] By adopting the above technical solution, by setting the ultraviolet-proof layer, the resistance and reflection effect of ultraviolet light can be further improved during use, further reducing the overall damage of ultraviolet light to the plastic bag body.

[0020] The beneficial effects of the present application are:

[0021] 1. By setting the plastic bag body, the inner layer of LDPE provides the basic flexibility and smooth surface of the bag, facilitating the placement and removal of articles; the middle layer of PA6 contains a large number of polar groups in its molecular chain, which can effectively block oxygen transmission, thereby achieving the purpose of oxygen barrier; the outer layer of EVA has good waterproof performance, which can effectively prevent external moisture from entering the bag, and also has good heat sealing performance, ensuring the sealing effect; the combination of the three forms a multifunctional protective barrier, which comprehensively improves the overall performance of the plastic bag; the three layers of material are formed into a whole film structure by one-time molding through co-extrusion process; this structure not only ensures good oxygen barrier and waterproof performance, but also has high mechanical strength and durability.

[0022] 2. By setting the reinforcing rib, the overall load-bearing performance of the plastic bag body can be further improved during use, and the force transmission can be more uniform during load-bearing, further improving the overall structural strength and stability during use. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the overall structure schematic diagram of the present application;

[0024] Figure 2 is the overall front structure schematic diagram of the present application;

[0025] Figure 3 is the internal structure schematic diagram of the present application;

[0026] Figure 4 is the reinforcing rib structure schematic diagram of the present application.

[0027] In the figure: 1, plastic bag body; 101, hollow groove; 2, outer layer; 201, nano coating; 202, ultraviolet-proof layer; 3, middle layer; 4, inner layer; 401, antibacterial layer; 6, collar; 7, sealing strip; 8, reinforcing rib; 801, transverse fiber; 802, longitudinal fiber. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] Reference Figures 1-4 An oxygen-barrier and water-barrier type flexible plastic bag includes a plastic bag body 1. The inside of the plastic bag body 1 includes a middle layer 3. The outer side and the inner side of the middle layer 3 are respectively provided with an outer layer 2 and an inner layer 4. The material of the inner layer 4 is LDPE, and the thickness of the outer layer 2 is 0.05 mm. The material of the middle layer 3 is PA6, and the thickness of the middle layer 3 is 0.08 mm. The material of the outer layer 2 is EVA, and the thickness of the middle layer 3 is 0.1 mm. The outside of the outer layer 2 is provided with a nano coating 201 composed of silicon dioxide nanoparticles.

[0030] By arranging the plastic bag body 1, when in use, the LDPE of the inner layer provides the basic flexibility and smooth surface of the bag, facilitating the placement and removal of articles. The PA6 of the middle layer can effectively block oxygen transmission due to the presence of a large number of polar groups in its molecular chain, thereby achieving the purpose of oxygen isolation. The EVA of the outer layer has good water resistance, which can effectively prevent external moisture from entering the bag, and also has good heat sealing performance, ensuring the sealing effect. The combination of the three forms a multifunctional protective barrier, comprehensively improving the overall performance of the plastic bag. The three layers of material are formed in one piece by a co-extrusion process, forming a whole film structure. This structure not only guarantees good oxygen barrier and water resistance, but also has high mechanical strength and durability. By arranging the nano coating 201 composed of silicon dioxide nanoparticles, which is uniformly coated on the outer layer 2, not only the water resistance can be enhanced, but also the ultraviolet resistance can be improved, prolonging the service life of the plastic bag.

[0031] Reference Figure 1The inner part of the plastic bag body 1 is provided with a reinforcing rib 8, the inner part of the reinforcing rib 8 comprises transverse fibers 801 and longitudinal fibers 802, a plurality of groups of transverse fibers 801 and a plurality of groups of longitudinal fibers 802 are arranged in cross, the reinforcing rib 8 is located between the outer layer 2 and the intermediate layer 3, and the overall material of the reinforcing rib 8 is PV; The inner side of the inner layer 4 is provided with an antibacterial layer 401, and the antibacterial layer 401 is specifically a silver ion antibacterial agent; The inner part of the plastic bag body 1 is provided with a hollow groove 101, and the inner part of the hollow groove 101 is provided with a sleeve ring 6; By arranging the reinforcing rib 8, the overall load-bearing performance of the plastic bag body 1 can be further improved during use, the force transmission can be more uniform during load-bearing, the overall structural strength is further improved, and the stability during use is improved; The antibacterial layer 401 can make the inner part of the plastic bag body 1 have the functions of sterilization and disinfection, and is especially suitable for packaging of food and medical supplies; By arranging the sleeve ring 6, the plastic bag body 1 can be conveniently lifted as a whole during use, and the overall practicability is improved.

[0032] Referring to Figure 1 The inner part of the plastic bag body 1 is provided with two groups of sealing strips 7, and the two groups of sealing strips 7 are matched with each other; By arranging the sealing strip 7, the sealing effect of the inner part of the plastic bag body 1 can be quickly achieved during use, and the convenience during use is improved; The outer part of the plastic bag body 1 is provided with an ultraviolet-proof layer 202, and the ultraviolet-proof layer 202 is specifically titanium dioxide reflector; By arranging the ultraviolet-proof layer 202, the resistance and reflection effect of ultraviolet light can be further improved during use, and the overall damage of ultraviolet light to the plastic bag body 1 is further reduced.

[0033] Working principle: by arranging the plastic bag body 1, the inner layer of LDPE provides the basic flexibility and smooth surface of the bag, facilitating the placement and removal of articles; The PA6 of the intermediate layer can effectively block oxygen transmission due to the large number of polar groups in the molecular chain, thereby achieving the purpose of oxygen barrier; The EVA of the outer layer has good waterproof performance, can effectively prevent external moisture from entering the bag, and also has good heat sealing performance, ensuring the sealing effect; The three form a multifunctional protective barrier, comprehensively improving the overall performance of the plastic bag, and the three layers of material are formed into an integral film structure by one-time molding through a co-extrusion process; The structure not only guarantees good oxygen barrier and waterproof performance, but also has high mechanical strength and durability; By arranging the reinforcing rib 8, the overall load-bearing performance of the plastic bag body 1 can be further improved during use, the force transmission can be more uniform during load-bearing, the overall structural strength is further improved, and the stability during use is improved;

[0034] Wherein, by setting the nano coating 201, the nano coating 201 is composed of silica nanoparticles, uniformly coated on the outer layer 2, which can not only enhance the waterproof performance, but also improve the anti-ultraviolet ability, prolong the service life of the plastic bag, the setting of the antibacterial layer 401 can make the inside of the plastic bag body 1 have the function of sterilization and disinfection, especially suitable for food and medical supplies packaging;

[0035] At the same time, by setting the sealing strip 7, the sealing effect of the inside of the plastic bag body 1 can be quickly completed during use, improving the convenience during use;

[0036] In addition, by setting the sleeve ring 6, it is more convenient to lift the plastic bag body 1 as a whole during use, improving the overall practicability; by setting the anti-ultraviolet layer 202, the resistance and reflection effect of ultraviolet rays can be further improved during use, further reducing the overall damage of ultraviolet rays to the plastic bag body 1.

[0037] The above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An oxygen and water blocking flexible plastic bag comprising a plastic bag body (1), characterized in that, The inside of the plastic bag body (1) comprises an intermediate layer (3), the outer side and the inner side of the intermediate layer (3) are respectively provided with an outer layer (2) and an inner layer (4), the material of the inner layer (4) is LDPE, and the thickness of the outer layer (2) is 0.05mm; the material of the intermediate layer (3) is PA6, the thickness of the intermediate layer (3) is 0.08mm, the material of the outer layer (2) is EVA, and the thickness of the intermediate layer (3) is 0.1mm.

2. The oxygen and water blocking flexible plastic bag according to claim 1, wherein The inside of the plastic bag body (1) is provided with a reinforcing rib (8), the inside of the reinforcing rib (8) comprises transverse fibers (801) and longitudinal fibers (802), a plurality of groups of the transverse fibers (801) and a plurality of groups of the longitudinal fibers (802) are arranged in a cross manner, the reinforcing rib (8) is located between the outer layer (2) and the intermediate layer (3), and the overall material of the reinforcing rib (8) is PVC.

3. The flexible plastic bag of claim 1, wherein The outside of the outer layer (2) is provided with a nano coating (201), and the nano coating (201) is composed of silicon dioxide nanoparticles.

4. The flexible plastic bag of claim 1, wherein The inner side of the inner layer (4) is provided with an antibacterial layer (401), and the antibacterial layer (401) is specifically a silver ion antibacterial agent.

5. The flexible plastic bag of claim 1, wherein The inside of the plastic bag body (1) is provided with two groups of sealing strips (7), and the two groups of sealing strips (7) are matched with each other.

6. The flexible plastic bag of claim 1, wherein The inside of the plastic bag body (1) is provided with a hollow groove (101), and the inside of the hollow groove (101) is provided with a sleeve ring (6).

7. The flexible plastic bag of claim 1, wherein The outside of the plastic bag body (1) is provided with an ultraviolet-proof layer (202), and the ultraviolet-proof layer (202) is specifically titanium dioxide reflector.

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