Tight composite type high-barrier linear easy-to-tear antibacterial nylon film and composite film thereof

Abstract

The utility model relates to the field of flexible packaging materials, in particular to a compact composite type high-barrier linear easy-to-tear antibacterial nylon film and a composite film thereof. The tight composite type high-barrier linear easy-to-tear antibacterial nylon sequentially comprises an anti-sticking antibacterial layer, a first linear easy-to-tear nylon layer, a barrier layer, a second linear easy-to-tear nylon layer and a tight composite layer from outside to inside, the composite film sequentially comprises a tight composite type high-barrier linear easy-to-tear antibacterial nylon film layer, an adhesive layer and a heat sealing layer from outside to inside. According to the compact composite type high-barrier linear easy-to-tear antibacterial nylon film, a five-layer composite structure is adopted, various materials are laminated and combined, the advantages of the various materials can be integrated, and the performances are complementary; the composite film comprising the compact composite type high-barrier linear easy-to-tear antibacterial nylon film has good mechanical property, barrier property, antibacterial property, linear easy-to-tear property and excellent composite peel strength, and has a very wide application prospect.

Description

Technical Field

[0001] The utility model relates to the field of soft packaging materials, in particular to a tightly composite high-barrier linear easy-tear antibacterial nylon film and a composite film thereof. Background Art

[0002] Biaxially oriented nylon film (BOPA) is widely used in the film packaging field due to its excellent barrier properties, puncture resistance, oil resistance, chemical solvent resistance and non-toxicity, becoming the third largest biaxially oriented film after BOPP and BOPET. However, nylon is easy to absorb moisture, which will greatly reduce the composite strength and barrier properties. In practical applications, nylon film needs to be composited with other films to prepare bags. If the composite strength is not enough, it will cause problems such as film delamination during use, which is not conducive to its widespread application. In order to improve its composite strength, corona or plasma treatment is used, but it is time-sensitive, and continuously increasing the treatment intensity will also damage the film surface, so it also has certain limitations.

[0003] With the upgrading of consumption, people have higher and higher requirements for packaging films. In addition to ensuring good composite strength, they also need to have excellent barrier and antibacterial properties to ensure food quality and safety. The packaging bags are also required to have good straight-line tearability, convenience of packaging and use, and prevent the contents from spilling.

[0004] At present, there are few films that have good mechanical properties, barrier properties, antibacterial properties, linear tear properties and excellent composite peel strength. The key to expanding the application of nylon membranes is to integrate multiple materials and complement their advantages. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art and provide a tightly composite high-barrier linear easy-tear antibacterial nylon film and a composite film thereof.

[0006] In order to achieve the above purpose, one of the technical solutions adopted by the utility model to solve its technical problems is: a tightly composite high-barrier linear tearable antibacterial nylon film, which is a five-layer co-extruded biaxially stretched film, which includes, from the outside to the inside, an anti-sticking antibacterial layer, a first linear tearable nylon layer, a barrier layer, a second linear tearable nylon layer, and a tightly composite layer.

[0007] In a preferred embodiment of the present invention, the thickness of the anti-sticking and antibacterial layer is 1-3 μm.

[0008] In a preferred embodiment of the present invention, the anti-sticking and antibacterial layer is a nylon resin layer containing an anti-blocking agent, a slip agent and an antibacterial agent.

[0009] In a preferred embodiment of the present invention, the thickness of the first linear easy-tear nylon layer and the second linear easy-tear nylon layer are both 3-8 μm.

[0010] In a preferred embodiment of the present invention, the first linear easy-tear nylon layer and the second linear easy-tear nylon layer are a mixture of nylon 6 resin and long-chain nylon resin or aromatic nylon resin.

[0011] In a preferred embodiment of the present invention, the thickness of the barrier layer is 2-5 μm.

[0012] In a preferred embodiment of the present invention, the barrier layer is EVOH resin and / or nylon 6 / flaky nanoparticle layer.

[0013] In a preferred embodiment of the present invention, the thickness of the compact composite layer is 1-3 μm.

[0014] In a preferred embodiment of the present invention, the compact composite layer is a nylon resin containing copolymerized polyamide and dendritic polyamide.

[0015] In a preferred embodiment of the present invention, the upper surface and / or lower surface of the tightly composite high-barrier linear tearable antibacterial nylon film layer is subjected to corona treatment.

[0016] In order to achieve the above purpose, the second technical solution adopted by the utility model to solve its technical problem is: a composite film comprising the above-mentioned tightly composite high-barrier linear easy-to-tear antibacterial nylon film, which includes, from the outside to the inside, a tightly composite high-barrier linear easy-to-tear antibacterial nylon film layer, an adhesive layer and a heat-sealing layer, and the nylon film layer is connected to the heat-sealing layer by an adhesive layer.

[0017] In a preferred embodiment of the present invention, the thickness of the adhesive layer is 1-3 μm.

[0018] In a preferred embodiment of the present invention, the adhesive layer is polyurethane glue.

[0019] In a preferred embodiment of the present invention, the thickness of the heat-sealing layer is 40-100 μm.

[0020] In a preferred embodiment of the present invention, the heat sealing layer is CPP or polyethylene film.

[0021] Compared with the background technology, this technical solution has the following advantages:

[0022] 1. The compact composite high-barrier straight-line easy-to-tear antibacterial nylon film of the utility model adopts a five-layer composite structure, and a variety of materials are stacked and combined, which can integrate the advantages of various materials and complement each other. On the basis of the mechanical properties of packaging materials, barrier, antibacterial, reinforced composite materials are integrated to achieve high barrier, antibacterial, compact composite and other functions, improve the barrier, antibacterial, composite peeling strength, processing performance and physical and mechanical properties of the material, and seek the best economic and social benefits at the same time;

[0023] 2. The utility model directly adds antibacterial agent to the surface layer of the tightly composite high-barrier straight-line tearable nylon, and directly co-extrudes it, which can ensure the antibacterial effect while minimizing the amount of addition, and will not affect the performance of the film, and does not require additional processes; the barrier layer adds flaky nanoparticles, which can ensure the barrier property while improving the mechanical properties of the film; the tightly composite layer uses nylon resin of copolymerized polyamide and dendritic polyamide, which, while ensuring processability, more promotes the reaction of the active amino group of the dendritic polyamide with the isocyanate group in the glue, thereby improving the composite peeling strength of the interface and increasing the fastness of the tightly composite;

[0024] 3. The composite film of the utility model, which includes a tightly composite high-barrier linear easy-tear antibacterial nylon film, has good mechanical properties, barrier properties, antibacterial properties, linear easy-tear properties and excellent composite peeling strength. It can be widely used in food packaging (especially packaging that requires refrigeration, boiling, steaming, microwave heating, etc.), pharmaceutical packaging and other fields, and has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a membrane layer structure diagram of a tightly composite high-barrier linear easy-tear antibacterial nylon membrane and a composite membrane thereof of the utility model.

[0027] Among them, 100-tight composite high barrier linear tearable antibacterial nylon film layer, 101-anti-stick antibacterial layer, 102-first linear tearable nylon layer, 103-barrier layer, 104-second linear tearable nylon layer, 105-tight composite layer, 200-adhesive layer, 300-heat sealing layer. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments. The implementation method can have different forms and should not be understood as being limited to the description set forth herein. The same reference numerals in the text always represent the same elements, and similar reference numerals represent similar elements.

[0029] It should be noted that the terms "upper", "lower" or "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. The "lower" or "inside" refers to the side in contact with the contents of the package, and the "upper" or "outside" refers to the side in contact with the external environment.

[0030] like Figure 1 As shown, a tightly composite high barrier straight tearable antibacterial nylon film is a five-layer co-extruded biaxially stretched film, which includes, from the outside to the inside, an anti-sticking antibacterial layer 101, a first straight tearable nylon layer 102, a barrier layer 103, a second straight tearable nylon layer 104, and a tightly composite layer 105. The anti-sticking antibacterial layer 101 is a nylon resin layer containing an opening agent, a slip agent, and an antibacterial agent; the thickness of the anti-sticking antibacterial layer 101 is 2 μm; the first straight tearable nylon layer 102 and the second straight tearable nylon layer 104 are a mixture of nylon 6 resin and long-chain nylon resin or aromatic nylon resin; the thickness of the first straight tearable nylon layer 102 and the second straight tearable nylon layer 104 are both 4 μm; the barrier layer 103 is EVOH resin or Nylon 6 / flaky nanoparticle layer; the thickness of the barrier layer 103 is 3μm; the tight composite layer 105 is a nylon resin containing copolymerized polyamide and dendritic polyamide; the thickness of the tight composite layer 105 is 2μm; the total thickness of the tight composite high-barrier linear easy-to-tear antibacterial nylon film layer 100 is 15μm, and the lower surface of the tight composite high-barrier linear easy-to-tear antibacterial nylon film layer 100 is corona treated, and the corona value is ≥52dyn.

[0031] A composite film comprising the above-mentioned tightly combined high-barrier straight-line tearable antibacterial nylon film comprises, from outside to inside, a tightly combined high-barrier straight-line tearable antibacterial nylon film layer 100, an adhesive layer 200 and a heat-sealing layer 300, wherein the tightly combined high-barrier straight-line tearable antibacterial nylon film layer 100 and the heat-sealing layer 300 are bonded by the adhesive layer 200. The adhesive layer 200 is polyurethane glue; the thickness of the adhesive layer 200 is 2 μm; the heat-sealing layer 300 is CPP or polyethylene film; the thickness of the heat-sealing layer 300 is 50 μm.

[0032] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not affect the essence of the corresponding technical solutions beyond the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tightly compounded high barrier linear tearable antibacterial nylon film, characterized in that: It is a five-layer co-extruded biaxially stretched film, which includes, from the outside to the inside, an anti-sticking antibacterial layer, a first linear easy-tear nylon layer, a barrier layer, a second linear easy-tear nylon layer, and a compact composite layer. The thickness of the anti-sticking antibacterial layer is 1-3 μm, the thickness of the first linear easy-tear nylon layer and the second linear easy-tear nylon layer are both 3-8 μm, the thickness of the barrier layer is 2-5 μm, and the thickness of the compact composite layer is 1-3 μm.

2. The tightly combined high barrier linear tearable antibacterial nylon membrane according to claim 1, characterized in that: The upper surface and / or lower surface of the tightly composite high-barrier linear easy-tear antibacterial nylon film layer is subjected to corona treatment.

3. A composite film comprising the tightly composite high barrier linear tearable antibacterial nylon film as claimed in claim 1 or 2, characterized in that: From outside to inside, it includes a tightly composite high-barrier straight-line easy-to-tear antibacterial nylon film layer, an adhesive layer and a heat-sealing layer. The tightly composite high-barrier straight-line easy-to-tear antibacterial nylon film layer is bonded to the heat-sealing layer through the adhesive layer. The thickness of the adhesive layer is 1-3μm, and the thickness of the heat-sealing layer is 40-100μm.

4. The composite film according to claim 3, characterized in that The adhesive layer is polyurethane glue, and the heat sealing layer is CPP or polyethylene film.

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