Nylon composite film for vacuum compression bag and vacuum compression bag

Abstract

The utility model relates to the technical field of flexible package films, in particular to a nylon composite film for a vacuum compression bag and the vacuum compression bag. The five-layer co-extrusion two-way stretching heat-sealable nylon film is adopted as the base material layer and cooperates with the barrier coating, the weather-resistant coating and the bonding layer, so that the composite film has good low-temperature heat sealability, mechanical property, barrier property, weather resistance and the like, is high in antibacterial and mildew-proof effect, not prone to being damaged in the actual use process, good in bending resistance and long in service life. And good performance can still be maintained under the condition of repeated use. The nylon composite film is used for preparing a vacuum compression bag, so that the vacuum compression bag also has the properties of low-temperature heat sealability, high barrier, high strength, high toughness and difficulty in damage.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible packaging films, in particular to a nylon composite film for vacuum compression bags and a vacuum compression bag. Background Art

[0002] In our daily life, vacuum compression bags are generally used as packaging bags for storing clothes, quilts, etc. The main working principle is to use a vacuum pump to extract the air in the packaging bag, thereby flattening the originally expanded packaging bag, saving space while also having the functions of dustproof, moisture-proof and mildew-proof.

[0003] Most of the vacuum compression bags currently in use are made of PET / PE, which have problems such as poor strength, poor toughness, and poor resistance to multiple bending. They are easily damaged during use or their performance degrades after repeated use. Some also have problems such as poor barrier properties.

[0004] Biaxially oriented polyamide film (BOPA) is a polyamide film that has been biaxially stretched to impart high mechanical strength, excellent barrier properties, and optical properties. As a major flexible packaging material following BOPP and BOPET, BOPA is widely used in various packaging applications due to its excellent puncture resistance, barrier properties, and non-toxicity. However, BOPA itself lacks heat sealability. Its use in vacuum compression bags is currently achieved by laminating it with PE or CPP, which undoubtedly adds an additional lamination process, increasing raw material, labor, and time costs.

[0005] Therefore, how to prepare a material that has both heat-sealing properties and high barrier properties and comprehensive mechanical properties is a technical problem that those skilled in the art urgently need to solve. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a nylon composite film for a vacuum compression bag and a vacuum compression bag.

[0007] The utility model provides a nylon composite film for vacuum compression bags, the film layer structure of which includes a base material layer, a barrier coating layer, an adhesive layer and a weather-resistant coating layer arranged in sequence from the inside to the outside;

[0008] The substrate layer includes an antibacterial heat-sealing layer, a first toughening nylon layer, an EVOH barrier layer, a second toughening nylon layer and a reinforced nylon layer which are sequentially arranged from the inside to the outside.

[0009] Preferably, the reinforced nylon layer is a nano-modified high-viscosity nylon layer with a thickness of 1 to 5 μm.

[0010] The high-viscosity nylon layer is modified by nanotechnology, which can improve the wear resistance and self-lubricating property of the nylon, has a slow water absorption speed, and has good stability of the finished product.

[0011] Preferably, the first toughened nylon layer is a PA6 / 66 copolymer nylon layer with a thickness of 2-5 mu m.

[0012] Preferably, the second toughened nylon layer is a PA6 / 66 copolymer nylon layer with a thickness of 2-5 mu m.

[0013] The first toughened nylon layer and the second toughened nylon layer are PA6 / 66 copolymer nylon layers, which combine the advantages of PA6 and PA66, and have excellent mechanical properties, heat resistance and processing performance.

[0014] Preferably, the EVOH barrier layer has a thickness of 4-8 mu m.

[0015] Preferably, the antibacterial heat-seal layer is a ternary copolymer nylon layer of nylon 6 / 66 / 1010 or nylon 6 / 1010 / 1212 with a thickness of 1-5 mu m.

[0016] The ternary copolymer nylon layer has good heat resistance, aging resistance and water absorption rate.

[0017] Preferably, the barrier coating is a water-resistant modified PVA nanometer barrier coating with a thickness of 1-2 mu m.

[0018] The water-resistant modified PVA nanometer barrier coating has good water resistance and barrier properties.

[0019] Preferably, the bonding layer is a water-based acrylic coating with a thickness of 1-2 mu m.

[0020] Preferably, the weather-resistant coating is prepared by uniformly mixing polyurethane resin glue, polyphosphazene microspheres, glass powder and ethyl acetate in a weight ratio of 100:10-25:20-40:150-200, the polyphosphazene microspheres have a diameter of 8-15 mu m, the glass powder has a particle size of 3-8 mu m, and the weather-resistant coating has a thickness of 2-3 mu m.

[0021] The polyphosphazene microspheres have excellent flexibility, which ensures that the vacuum compression bag has good folding resistance, and the glass powder has a proper toughening and reinforcing effect, avoiding the influence of the weather-resistant coating on the strength of the vacuum compression bag.

[0022] The utility model also provides a vacuum compression bag made of the nylon composite film for a vacuum compression bag.

[0023] Compared with the prior art, the utility model discloses a five -layer co -extrusion biaxial stretching heat -sealable nylon film as base material, cooperates barrier coating, weather -resistant coating and cement layer, makes it have good low -temperature heat -sealability, mechanical property, barrier property and weather resistance etc., and its antibacterial mildewproof effect is high, is not easy to break down in actual use process, and the bending resistance is good, can still keep good performance under the condition of repeated use. The antibacterial heat -seal layer guarantees the good heat -sealing effect and has good puncture resistance, and reduces the process of glue and compound, and when the whole packaging is thinned, the compound process is also saved;The base material also combines the reinforced nylon layer, the tough nylon layer and the EVOH barrier layer, solves the problems of poor strength, poor toughness, poor resistance to repeated bending, poor barrier property;The barrier coating plays a synergistic barrier effect, prevents air leakage during long -term storage, and the material and thickness design of the barrier coating makes it relatively soft, increases the softness of the whole packaging layer, and plays a dustproof, moistureproof and mildewproof role;The weather -resistant coating improves the overall weather resistance of the vacuum compression bag, avoids the damage of the vacuum compression bag of the nylon composite film material at the folding storage fold, and the like. The nylon composite film is used for the vacuum compression bag, and has the properties of low-temperature heat-sealing, high barrier, high strength, high toughness and not easy to break. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 The film layer structure diagram of the nylon composite film for the vacuum compression bag provided by the utility model.

[0026] Reference signs:

[0027] DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] The utility model provides Figure 1 The nylon composite film for vacuum compression bags shown has the following technical solution:

[0031] The nylon composite film for vacuum compression bags has a film layer structure comprising a base material layer 10, a barrier coating layer 20, an adhesive layer 30 and a weather-resistant coating layer 40 arranged in sequence from the inside to the outside;

[0032] The substrate layer 10 includes an antibacterial heat-sealing layer 11 , a first toughening nylon layer 12 , an EVOH barrier layer 13 , a second toughening nylon layer 14 and a reinforcing nylon layer 15 , which are sequentially arranged from the inside to the outside.

[0033] During specific implementation, the barrier coating 20 and the weather-resistant coating 40 are connected by the adhesive layer 30. The barrier coating 20 has a barrier effect to prevent air leakage during long-term storage. The material and thickness design of the barrier coating 20 make it relatively soft, increase the softness of the entire packaging layer, and play a role in dustproof, moisture-proof and mildew-proof; the weather-resistant coating 40 improves the overall weather resistance of the vacuum compression bag, and avoids the problem of damage at the creases of the vacuum compression bag made of nylon composite film material after folding and storage; the substrate layer 10 includes an antibacterial heat-sealing layer 11, a first toughened nylon layer 12, an EVOH barrier layer 13, a second toughened nylon layer 14 and a reinforced nylon layer 15 arranged in sequence from the inside to the outside, wherein the antibacterial heat-sealing layer 11 ensures a good heat-sealing effect while having good puncture resistance, while reducing the glue and composite processes and thinning the entire packaging; the substrate is also combined with the reinforced nylon layer 15, the toughened nylon layer and the EVOH barrier layer 13 to solve the problems of poor strength, poor toughness, poor resistance to multiple bending and poor barrier properties.

[0034] In summary, the present invention adopts a five-layer co-extruded biaxially stretched heat-sealable nylon film as the substrate layer 10, and cooperates with the barrier coating 20, the weather-resistant coating 40 and the adhesive layer 30, so that it has excellent low-temperature heat sealing properties, mechanical properties, barrier properties and weather resistance, etc. It has high antibacterial and mildew-proof effects, is not easy to break during actual use, has good bending resistance, and can maintain good performance after repeated use.

[0035] In an embodiment, the reinforced nylon layer 15 is a nano-modified high-viscosity nylon layer with a thickness of 3 μm.

[0036] With the above technical solution, the nano-modified high-viscosity nylon layer can improve the wear resistance and self-lubricity of nylon, has a slow water absorption speed, and has good product stability.

[0037] It should be noted that the nano-modified high-viscosity nylon layer is a material available at present, for example, the reinforced nylon layer 15 can preferably adopt the nano nylon layer prepared by the "Antistatic High-Barrier Nano-Coated Nylon Film" disclosed in the existing Chinese Patent Publication No. CN209096184U.

[0038] In an embodiment, the first toughened nylon layer 12 and the second toughened nylon layer 14 are PA6 / 66 copolymer nylon layers with a thickness of 4 μm.

[0039] With the above technical solution, the first toughened nylon layer 12 and the second toughened nylon layer 14 are PA6 / 66 copolymer nylon layers, which combine the advantages of PA6 and PA66, and have excellent mechanical properties, heat resistance, and processing performance.

[0040] It should be noted that the PA6 / 66 copolymer nylon layer can preferably adopt the PA6 / MXD6 blend nylon layer in the prior art.

[0041] In an embodiment, the EVOH barrier layer 13 has a thickness of 6 μm.

[0042] It should be noted that the EVOH barrier layer 13 can preferably adopt the EVOH barrier layer 13 prepared by the "Nano-Modified High-Barrier Antibacterial Biaxially Stretched Nylon Film and Preparation Method Thereof" disclosed in the existing Chinese Patent Publication No. CN117601532A, which is composed of 100 wt% of EVOH resin.

[0043] In an embodiment, the antibacterial heat-seal layer 11 is a nylon 6 / 66 / 1010 or nylon 6 / 1010 / 1212 terpolymer nylon layer with a thickness of 3 μm.

[0044] With the above technical solution, the purpose is that the terpolymer nylon layer has good heat resistance, aging resistance, and water absorption rate.

[0045] It should be noted that the nylon 6 / 66 / 1010 or nylon 6 / 1010 / 1212 terpolyamide layer is a prior art, and the nylon 6 / 66 / 1010 or nylon 6 / 1010 / 1212 terpolyamide layer provided in the existing Chinese patent publication CN111806030B "Coated high-barrier biaxially stretched polyamide film and preparation method thereof" can be preferably used.

[0046] In an embodiment, the barrier coating layer 20 is a water-resistant modified PVA nano barrier coating layer 20, and the thickness is 1.5 μm.

[0047] The above technical scheme is adopted, and the purpose is that the water-resistant modified PVA nano barrier coating layer 20 has good water resistance and barrier performance.

[0048] It should be noted that the water-resistant modified PVA nano barrier coating layer 20 is a prior art, and the water-resistant modified nano barrier coating layer 20 provided in the existing Chinese patent publication CN209666514U "Self-heating food packaging cover film" can be preferably used.

[0049] In an embodiment, the adhesive layer 30 is a water-based acrylic coating, and the thickness is 1.5 μm.

[0050] It should be noted that the water-based acrylic coating is a prior art, and the water-based acrylic coating obtained by the preparation method of high-performance water-based acrylic resin in Chinese patent publication CN109796555A can be preferably used.

[0051] In an embodiment, the weather-resistant coating layer 40 is prepared by uniformly mixing polyurethane resin glue, polyphosphazene microspheres, glass powder and ethyl acetate in a weight ratio of 100:10~25:20~40:150~200, the diameter of the polyphosphazene microspheres is 8-15 μm, the particle size of the glass powder is 3-8 μm, and the thickness of the weather-resistant coating layer 40 is 2~3 μm.

[0052] The above technical scheme is adopted, and the purpose is that the polyphosphazene microspheres have excellent flexibility, which ensures that the vacuum compression bag has good folding resistance, and the glass powder has a proper toughening effect, which avoids the influence of the setting of the weather-resistant coating layer on the strength of the vacuum compression bag.

[0053] It should be noted that the weather-resistant coating layer 40 is a coating layer existing in the prior art, and the selection of the component materials adopts the weather-resistant coating layer scheme provided in the Chinese patent publication CN111497397A "Vacuum compression bag and manufacturing method thereof", and the scheme in embodiment 1 thereof can be specifically used.

[0054] It should be noted that in the embodiment, the thickness of the reinforced nylon layer 15 is 3 μm, the thickness of the first toughened nylon layer 12 and the second toughened nylon layer 14 is 4 μm, the thickness of the EVOH barrier layer 13 is 6 μm, the thickness of the antibacterial heat-seal layer 11 is 3 μm, the thickness of the barrier coating 20 and the adhesive layer 30 is 1.5 μm, and the thickness of the weather-resistant coating 40 is 3 μm. According to the above design concept, those skilled in the art can adjust the thickness of the film layer within the above thickness range, including but not limited to the embodiment scheme.

[0055] The utility model further provides a kind of vacuum compression bag, made of the nylon composite film for vacuum compression bag as described above, with the performance of low-temperature heat-seal, high barrier, high strength, high toughness, not easy to break.

[0056] Although the terms such as reinforced nylon layer, EVOH barrier layer, antibacterial heat-seal layer, first toughened nylon layer and second toughened nylon layer are used more in this paper, but the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the utility model; it is contrary to the spirit of the utility model to be explained as any kind of additional limitation.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A nylon composite film for vacuum compression bags, characterized by: The film layer structure comprises a base material layer (10), a barrier coating layer (20), an adhesive layer (30) and a weather-resistant coating layer (40) arranged in sequence from the inside to the outside; The substrate layer (10) comprises an antibacterial heat-sealing layer (11), a first toughening nylon layer (12), an EVOH barrier layer (13), a second toughening nylon layer (14), and a reinforcing nylon layer (15), which are arranged in sequence from the inside to the outside.

2. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The reinforced nylon layer (15) is a nano-modified high-viscosity nylon layer with a thickness of 1 to 5 μm.

3. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The first toughening nylon layer (12) is a PA6 / 66 copolymer nylon layer with a thickness of 2-5 μm.

4. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The second toughening nylon layer (14) is a PA6 / 66 copolymer nylon layer with a thickness of 2-5 μm.

5. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The EVOH barrier layer (13) has a thickness of 4 to 8 μm.

6. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The antibacterial heat-sealing layer (11) is a nylon 6 / 66 / 1010 or nylon 6 / 1010 / 1212 ternary copolymer nylon layer with a thickness of 1 to 5 μm.

7. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The barrier coating (20) is a water-resistant modified PVA nano-barrier coating (20) with a thickness of 1-2 μm.

8. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The bonding layer (30) is a water-based acrylic coating with a thickness of 1-2 μm.

9. The nylon composite film for vacuum compression bags according to claim 1, characterized in that: The weather-resistant coating (40) is prepared by uniformly mixing polyurethane resin glue, polyphosphazene microspheres, glass powder and ethyl acetate in a weight ratio of 100:10~25:20~40:150~200, the diameter of the polyphosphazene microspheres is 8-15 μm, the particle size of the glass powder is 3-8 μm, and the thickness of the weather-resistant coating (40) is 2~3 μm.

10. A vacuum compression bag, characterized in that: The vacuum compression bag is made of the nylon composite film for vacuum compression bags according to any one of claims 1 to 9.

Images