High-performance PE (polyethylene) preservative film for automatic packaging machine

Abstract

The invention discloses a high-performance PE (polyethylene) preservative film for an automatic packaging machine. The preservative film comprises a core layer, at least two middle layers and at least one surface layer, wherein by mass percent, the core layer is formed by mixing 80%-90% of LLDPE (linear low density polyethylene) and mLLDPE (metallocene linear low density polyethylene), 5%-10% of POE (polyolefin elastomer), 3%-5% of an antifogging agent, 1%-3% of stearic acid and 3%-5% of cellulose; each middle layer is formed by mixing 80%-90% of LLDPE and mLLDPE, 5%-10% of POE, 3%-5% of an antifogging agent and 3%-5% of cellulose; each surface layer is formed by mixing 85%-90% of LLDPE and mLLDPE, 1%-3% of POE, 1%-3% of an antifogging agent, 3%-5% of conductive mica powder, 1%-3% of ethyl distearamide and 3%-5% of cellulose. The preservative film is easily smoothly cut off by a cutter on the automatic preservative film packaging machine, and is excellent in flexibility, contractility, viscosity and transparency, moderate in water vapor penetration rate and excellent in oxygen barrier rate; the preservative effect can be greatly improved.

Description

technical field

[0001] The invention relates to a fresh-keeping film, in particular to a high-performance PE fresh-keeping film used in an automatic packaging machine. Background technique

[0002] Fruit and vegetable supermarkets, distribution centers, food processing plants, meat processing companies, etc. often need to use automatic plastic wrap packaging machines to pack various foods with plastic wrap in trays for storage, display and sales, but currently used for automatic fresh-keeping The cling film on the film packaging machine is usually commercially available PE cling film, which has a single film structure, mostly a single-layer structure, or although it is a multi-layer structure, due to the limitation of the PE cling film formula, the flexibility of the PE cling film Poor performance, shrinkage and adhesion, when used on automatic plastic wrap packaging machines, it will cause problems such as the plastic wrap cannot be cut smoothly by the cutter on the automat...

Examples

Embodiment 1

[0024] Such as figure 1 A PE fresh-keeping film for an automatic packaging machine is shown, which includes a core layer 1 with a thickness of 10 μm. The upper and lower surfaces of the core layer 1 are respectively provided with two intermediate layers 2 each with a thickness of 10 μm, which are located on the core layer 1. The upper surface of the uppermost middle layer 2 and the lower surface of the lowermost middle layer 2 located on the lower surface of the core layer 1 are provided with a surface layer 3 with a thickness of 2 μm, the core layer 1 and the middle layer 2, the middle layer 2 and the middle layer 2 , The middle layer 2 and the surface layer 3 are extruded by a single-screw extruder and then cast into an integrated film structure, wherein the core layer 1 is composed of LLDPE and mLLDP (mass ratio 1:4), POE, Anti-fogging agent, stearic acid and cellulose are mixed. The middle layer 2 is made of LLDPE and mLLDPE (mass ratio 1:1), POE, anti-fogging agent and ce...

Embodiment 2

[0026] Such as figure 1 A PE fresh-keeping film for an automatic packaging machine as shown, including a core layer 1 with a thickness of 2 μm, the upper and lower surfaces of the core layer 1 are respectively provided with two intermediate layers 2 each with a thickness of 2 μm, located on the core layer 1 The upper surface of the uppermost middle layer 2 and the lower surface of the lowermost middle layer 2 located on the lower surface of the core layer 1 are provided with a surface layer 3 with a thickness of 2 μm, the core layer 1 and the middle layer 2, the middle layer 2 and the middle layer 2 , The middle layer 2 and the surface layer 3 are extruded by a single-screw extruder and then cast into an integrated film structure, wherein the core layer 1 is composed of mLLDPE, POE, anti-fogging agent, stearic acid and fiber The middle layer 2 is made by mixing mLLDPE, POE, anti-fogging agent and cellulose according to the mass percentage, and the surface layer 3 is composed o...

Embodiment 3

[0028] Such as image 3 A PE fresh-keeping film for an automatic packaging machine as shown, including a core layer 1 with a thickness of 2 μm, the upper and lower surfaces of the core layer 1 are respectively provided with two intermediate layers 2 each with a thickness of 2 μm, located on the core layer 1 The upper surface of the uppermost middle layer 2 and the lower surface of the lowermost middle layer 2 located on the lower surface of the core layer 1 are provided with a surface layer 3 with a thickness of 2 μm, the core layer 1 and the middle layer 2, the middle layer 2 and the middle layer 2 , The middle layer 2 and the surface layer 3 are extruded by a single-screw extruder and then cast into an integrated film structure, wherein the core layer 1 is composed of mLLDPE, POE, anti-fogging agent, stearic acid and fiber The middle layer 2 is made by mixing LLDPE, POE, anti-fogging agent and cellulose according to the mass percentage, and the surface layer 3 is composed of...

technical field

[0001] The invention relates to a fresh-keeping film, in particular to a high-performance PE fresh-keeping film used in an automatic packaging machine. Background technique

[0002] Fruit and vegetable supermarkets, distribution centers, food processing plants, meat processing companies, etc. often need to use automatic plastic wrap packaging machines to pack various foods with plastic wrap in trays for storage, display and sales, but currently used for automatic fresh-keeping The cling film on the film packaging machine is usually commercially available PE cling film, which has a single film structure, mostly a single-layer structure, or although it is a multi-layer structure, due to the limitation of the PE cling film formula, the flexibility of the PE cling film Poor performance, shrinkage and adhesion, when used on automatic plastic wrap packaging machines, it will cause problems such as the plastic wrap cannot be cut smoothly by the cutter on the automat...

Examples

Embodiment 1

[0024] Such as figure 1 A PE fresh-keeping film for an automatic packaging machine is shown, which includes a core layer 1 with a thickness of 10 μm. The upper and lower surfaces of the core layer 1 are respectively provided with two intermediate layers 2 each with a thickness of 10 μm, which are located on the core layer 1. The upper surface of the uppermost middle layer 2 and the lower surface of the lowermost middle layer 2 located on the lower surface of the core layer 1 are provided with a surface layer 3 with a thickness of 2 μm, the core layer 1 and the middle layer 2, the middle layer 2 and the middle layer 2 , The middle layer 2 and the surface layer 3 are extruded by a single-screw extruder and then cast into an integrated film structure, wherein the core layer 1 is composed of LLDPE and mLLDP (mass ratio 1:4), POE, Anti-fogging agent, stearic acid and cellulose are mixed. The middle layer 2 is made of LLDPE and mLLDPE (mass ratio 1:1), POE, anti-fogging agent and ce...

Embodiment 2

[0026] Such as figure 1 A PE fresh-keeping film for an automatic packaging machine as shown, including a core layer 1 with a thickness of 2 μm, the upper and lower surfaces of the core layer 1 are respectively provided with two intermediate layers 2 each with a thickness of 2 μm, located on the core layer 1 The upper surface of the uppermost middle layer 2 and the lower surface of the lowermost middle layer 2 located on the lower surface of the core layer 1 are provided with a surface layer 3 with a thickness of 2 μm, the core layer 1 and the middle layer 2, the middle layer 2 and the middle layer 2 , The middle layer 2 and the surface layer 3 are extruded by a single-screw extruder and then cast into an integrated film structure, wherein the core layer 1 is composed of mLLDPE, POE, anti-fogging agent, stearic acid and fiber The middle layer 2 is made by mixing mLLDPE, POE, anti-fogging agent and cellulose according to the mass percentage, and the surface layer 3 is composed o...

Embodiment 3

[0028] Such as image 3 A PE fresh-keeping film for an automatic packaging machine as shown, including a core layer 1 with a thickness of 2 μm, the upper and lower surfaces of the core layer 1 are respectively provided with two intermediate layers 2 each with a thickness of 2 μm, located on the core layer 1 The upper surface of the uppermost middle layer 2 and the lower surface of the lowermost middle layer 2 located on the lower surface of the core layer 1 are provided with a surface layer 3 with a thickness of 2 μm, the core layer 1 and the middle layer 2, the middle layer 2 and the middle layer 2 , The middle layer 2 and the surface layer 3 are extruded by a single-screw extruder and then cast into an integrated film structure, wherein the core layer 1 is composed of mLLDPE, POE, anti-fogging agent, stearic acid and fiber The middle layer 2 is made by mixing LLDPE, POE, anti-fogging agent and cellulose according to the mass percentage, and the surface layer 3 is composed of...

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