Production process of thermal contraction two-way stretch polyamides film

A production process and transverse stretching technology, applied in the field of BOPA film production process, can solve the problems of wrinkles, affect product appearance, sales discount, etc., and achieve the effect of high thermal shrinkage rate

Inactive Publication Date: 2012-07-11
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the existing BOPA film is boiled and heat-sterilized or steamed and heat-sterilized, severe wrinkles will appear, which will affect the appearance of the product and cause the sales of the merchants to be greatly reduced.

Method used

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  • Production process of thermal contraction two-way stretch polyamides film
  • Production process of thermal contraction two-way stretch polyamides film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The production process of BOPA film comprises the following steps:

[0042] 1) Melt the PA masterbatch and extrude it into a film through a three-extrusion extruder. The extrusion temperature of the extruder is 255°C, and the temperature of the die head of the extruder is 235°C;

[0043] 2) Cool and form at 20-28°C to obtain crude PA film;

[0044] 3) The crude PA film is stretched longitudinally and transversely in turn, and rolled up to obtain the product.

[0045] Among them, the temperature of longitudinal stretching is 53°C, and the stretching ratio is 320%;

[0046] The heat-setting temperature in transverse stretching was 140° C., and the stretching ratio was 330%.

Embodiment 2

[0048] The production process of BOPA film comprises the following steps:

[0049] 1) Melt the PA masterbatch and extrude it into a film through a three-extrusion extruder. The extrusion temperature of the extruder is 240°C, and the temperature of the die head of the extruder is 240°C;

[0050] 2) Cool and form at 20-28°C to obtain crude PA film;

[0051] 3) The crude PA film is stretched longitudinally and transversely in turn, and rolled up to obtain the product.

[0052] Among them, the temperature of longitudinal stretching is 45°C, and the stretching ratio is 300%;

[0053] The heat-setting temperature in transverse stretching was 160° C., and the stretching ratio was 350%.

Embodiment 3

[0055] The production process of BOPA film comprises the following steps:

[0056] 1) Melt the PA masterbatch and extrude it into a film through a three-extrusion extruder. The extrusion temperature of the extruder is 270°C, and the temperature of the die head of the extruder is 240°C;

[0057] 2) Cool and form at 20-28°C to obtain crude PA film;

[0058] 3) The crude PA film is stretched longitudinally and transversely in turn, and rolled up to obtain the product.

[0059] Among them, the temperature of longitudinal stretching is 60°C, and the stretching ratio is 340%;

[0060] The heat-setting temperature in transverse stretching was 130° C., and the stretching ratio was 320%.

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Abstract

The invention discloses a production process of a two-way stretch polyamides (BOPA) film, which comprises the following steps of enabling the polyamides (PA) masterbatch to be fused and extruding a formed film out through a three-extrusion extruder; cooling and shaping to obtain coarse products of PA thin films; enabling the coarse products of the PA thin films to respectively conduct longitudinal stretch and transverse stretch, and rolling to obtain products. Each index of the BOPA film produced by using the method meets national food safety standards, and can not only effectively separate oxygen as a general BOPA film, but also have high heat contractibility rate. Experimental data indicate that the thermal contraction two-way stretch polyamides film is boiled in water at the temperature of 100 DEG C for 30 minutes, longitudinal contractibility rate and transverse contractibility rate are both not lower than 10%, and product appearance of food packages prepared by using the BOPA film is still smooth and free of puckering after high temperature sterilization.

Description

technical field [0001] The invention relates to a production process of BOPA film, in particular to a production process of BOPA film used for food packaging. Background technique [0002] In order to extend the shelf life of products and facilitate transportation and sales points, existing foods, especially cooked foods, are generally packaged in various film bags. [0003] The currently used food packaging generally has the following types: [0004] 1. BOPP is compounded with CPP or PE. Due to its poor oxygen barrier properties, it is generally used for dry goods, candy, and biscuit packaging. [0005] 2. BOPET is compounded with CPP or PE. Due to its poor oxygen barrier properties, it is generally used for dry goods, candy, and biscuit packaging. [0006] 3. BOPA (heat-shrinkable biaxially oriented nylon) is compounded with CPP or PE. Due to its good oxygen barrier properties, it is generally used for cooked food packaging, seafood packaging, and pickled vegetable packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C55/12B29C47/92B29K77/00B29C48/92
CPCB29C48/08B29C48/92B29C2948/92704B29C2948/92923
Inventor 区广辉龙伟全郭燕雄廖国文
Owner FSPG HI TECH
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