Preparation method for multi-layer co-extrusion two-way stretched high-barrier plastic casing

A technology of biaxial stretching and multi-layer co-extrusion, which is applied in the field of preparation of multi-layer co-extruded biaxially stretched high-barrier plastic casings, can solve problems such as the generation of chloride ion monomers, black spots, difficulties, etc., and achieve good mechanical strength , reduce weight loss and prolong shelf life

Active Publication Date: 2012-08-01
南通环球塑料工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inadequacies of existing packaging: a. Although the barrier properties of PVDC plastic casings are very suitable for packaging applications, there are many defects in processing performance when using this material. For example, PVDC has thermal instability and requires special equipment for processing. Long-term exposure of PVDC to high temperature environment is prone to produce gel and carbonized particles, resulting in black spots, which will have a certain impact on the production of high-quality products. At the same time, PVDC resin may produce chloride ion monomers duri

Method used

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  • Preparation method for multi-layer co-extrusion two-way stretched high-barrier plastic casing
  • Preparation method for multi-layer co-extrusion two-way stretched high-barrier plastic casing

Examples

Experimental program
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Effect test

Embodiment 1

[0010] The preparation method of the multi-layer co-extruded biaxially stretched high-barrier plastic casing comprises the following steps:

[0011] Multi-layer co-extruded biaxially stretched high-barrier plastic casings are five-layer raw materials co-extruded, the first layer, the inner layer is polyamide and polyolefin, with a weight percentage of 15%, the second layer, the adhesive layer is polyolefin, Blend of ionomer and adhesive resin, 10% by weight, the third, barrier layer is ethylene-vinyl alcohol copolymer, 5% by weight, and the fourth, adhesive layer is polyolefin , ionomer and adhesive resin blend, the percentage by weight is 10%, the fifth layer, that is, the outer layer is polyamide, and the percentage by weight is 60%; the above-mentioned layers of raw materials are respectively added to each layer of extruder for melting Melting and plasticizing, the temperature is 210°C for polyamide, 170°C for ethylene-vinyl alcohol copolymer, 160°C for polyolefin, 160°C fo...

Embodiment 2

[0013] The preparation method of the multi-layer co-extruded biaxially stretched high-barrier plastic casing comprises the following steps:

[0014] Multi-layer co-extruded biaxially stretched high-barrier plastic casings are five-layer raw materials co-extruded, the first layer, the inner layer is polyamide and ionomer, the weight percentage is 15%, the second layer, the adhesive layer is polyamide Olefins, ionomers and pure adhesive resins, 15% by weight, the third, barrier layer is ethylene-vinyl alcohol copolymer, 10% by weight, and the fourth, adhesive layer is polyolefin , ionomer and pure adhesive resin, the weight percentage is 15%, the fifth layer, that is, the outer layer is polyamide, and the weight percentage is 45%; the raw materials of the above layers are added to each layer of extruder for melting and molding The processing temperature is 230°C for polyamide, 200°C for ethylene-vinyl alcohol copolymer, 190°C for polyolefin, and 195°C for ionomer and adhesive re...

Embodiment 3

[0016] The preparation method of the multi-layer co-extruded biaxially stretched high-barrier plastic casing comprises the following steps:

[0017] Multi-layer co-extruded biaxially stretched high-barrier plastic casing is a five-layer raw material co-extruded, the first layer, the inner layer is polyamide and ionomer, the weight percentage is 30%, the second layer, the adhesive layer is polyamide Olefins, ionomers and pure adhesive resins, 15% by weight, the third, barrier layer is ethylene-vinyl alcohol copolymer, 10% by weight, and the fourth, adhesive layer is polyolefin , ionomer and adhesive resin blend, the percentage by weight is 15%, the fifth layer, that is, the outer layer is polyamide, and the percentage by weight is 30%; the above-mentioned layers of raw materials are respectively added to each layer of extruder for melting Melting and plasticizing, the temperature is 250°C for polyamide, 225°C for ethylene-vinyl alcohol copolymer, 220°C for polyolefin, 230°C for...

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Abstract

The invention discloses a preparation method for a multi-layer co-extrusion two-way stretched high-barrier plastic casing. The preparation method comprises the following steps of: respectively adding raw materials of each layer into an extruder for each layer for melting and plasticizing, wherein the multi-layer co-extrusion two-way stretched high-barrier plastic casing is formed by co-extruding five layers of raw materials; extruding the raw materials by a multi-layer stacked type round mold to form a multi-layer mold blank; slightly blowing and stretching the mold blank, and then immediately and rapidly cooling and molding the mold blank by using cooling water of 5-15 DEG C into a first pipe film; heating the first pipe film in a hot water tank or an infrared heating system to a proper temperature; aerating compressed air to ensure that the mold blank is transversely stretched for a multiplying power of 3 to 5 times and longitudinally stretched for a multiplying power of 2.5 to 3 times to form a second pipe film; putting the second pipe film in an infrared heating barrel for sizing; and rolling a finished product after cooling the second pipe film to a required fold diameter and shrinkage rate by using a vane. Plastic casings prepared by the preparation method have the characteristics of high barrier, high water retention and environmental protection.

Description

technical field [0001] The invention relates to a method for preparing multi-layer co-extruded biaxially stretched high-barrier plastic casings. The high-barrier plastic casings are mainly used for freezing, fresh-keeping and cooking packaging of low-temperature meat products or other foods, and are used for automatic punching and ligation machines or manual Packaging of low-temperature meat products such as sandwiches, sandwiches, and round hams produced by clocking in. Background technique [0002] At present, the plastic casings used to make ham sausages and sandwich square legs on the market include polyvinylidene chloride (PVDC) high-temperature cooking plastic casings, polyamide (PA) and polyolefin (PO) and other resins. Multi-layer co-extrusion Two-way stretch low-temperature cooking plastic casings. Inadequacies of existing packaging: a. Although the barrier properties of PVDC plastic casings are very suitable for packaging applications, there are many defects in pr...

Claims

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Application Information

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IPC IPC(8): B29C69/02B29C47/06B29C55/12
Inventor 范广亮
Owner 南通环球塑料工程有限公司
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