Anti-fog high-barrier micro-contraction cooked food wrapping film and preparation method thereof
A high-barrier, micro-shrinkage technology, which is applied in packaging, wrapping paper, household packaging, etc., can solve the problems of inability to effectively inhibit the free shrinkage of ordinary shrink films, the inability to achieve quenching in cooling treatment, and the unfavorable orientation of molecular segments. Effects of preventing damage to products, inhibiting free shrinkage, and excellent tensile strength
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[0031] A second aspect of the present invention provides a method for preparing an anti-fog high barrier micro-shrink cooked food packaging film, comprising the following steps:
[0032] S1. Co-extrusion molding: the raw materials are arranged in order from top to bottom according to the order of polyethylene layer, first adhesive layer, first polyamide layer, barrier layer, second polyamide layer, second adhesive layer and heat-sealing layer Put it into the extruder to co-extrude the film tube, and use water cooling to cool the film tube, so as to control the formation of crystallization through quenching, so as to facilitate the orientation of molecular segments, so as to achieve the purpose of reducing the haze of the finished product. Among them, the water temperature of the water cooling treatment is 5-15°C, and the flow rate is 20-35L / min;
[0033]S2. Inflation: heat the cooled film tube to the preheating temperature, stretch the film tube, and then use compressed air to...
Embodiment 1
[0044] A method for preparing an anti-fog high-barrier micro-shrink cooked food packaging film with a thickness of 30 μm, comprising the following steps:
[0045] S1, co-extrusion
[0046] The raw materials shown in Example 1 in Table 1 were put into the extruder in order from top to bottom to co-extrude the film tube, and the film tube was cooled by water-cooling treatment, wherein the water temperature of the water-cooling treatment was 5 °C, the flow rate is 25L / min.
[0047] S2, inflation
[0048] Heat the cooled film tube to the preheating temperature (60°C), stretch the film tube, and then use compressed air to perform secondary inflation to obtain a film. The inflation ratio of the secondary inflation is 2, and the traction ratio is 2.5.
[0049] S3, heat setting
[0050] The film obtained by secondary inflation in S2 is pulled to the shaping mechanism at a pulling speed of 30m / min, and heated again to the shaping temperature (60°C) to shape the film to obtain an an...
Embodiment 2
[0052] A method for preparing an anti-fog high-barrier micro-shrink cooked food packaging film with a thickness of 45 μm, comprising the following steps:
[0053] S1, co-extrusion
[0054] The raw materials shown in Example 2 in Table 1 are put into the extruder in order from top to bottom to co-extrude the film tube, and the film tube is cooled by water-cooling treatment, so as to control the formation of crystals by quenching , in order to facilitate the orientation of molecular segments, so as to achieve the purpose of reducing the haze of the finished product. Wherein, the water temperature of the water cooling treatment is 5° C., and the flow rate is 25 L / min.
[0055] S2, inflation
[0056] Heat the cooled film tube to the preheating temperature (60°C), stretch the film tube, and then use compressed air to perform secondary inflation to obtain a film. The inflation ratio of the secondary inflation is 2, and the traction ratio is 2.5.
[0057] S3, heat setting
[005...
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