Three-layer co-extrusion packaging film and preparation method thereof
A three-layer co-extrusion, packaging film technology, used in packaging, wrapping paper, household packaging, etc., can solve the problems of low packaging speed, product loss, restricted development, etc., and achieve easy opening, good stiffness, and smooth film surface. Effect
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[0097] The preparation raw materials of the inner layer, the middle layer and the outer layer of the present invention are weighed and configured separately to obtain the mixture of the inner layer, the middle layer and the outer layer, and then the inner layer mixture and the middle layer are mixed according to the weight ratio of the inner layer, the middle layer and the outer layer material and outer layer mix.
[0098] The standards of the parts by weight of the inner layer, the middle layer and the outer layer are different in the present invention.
[0099] The second aspect of the present invention provides a method for preparing a three-layer co-extrusion packaging film, which includes: respectively transporting the preparation raw materials of the inner layer, the middle layer and the outer layer to three extruders. After being plasticized in the machine, it is transported to the same three-layer blown film die head, and the inner layer, middle layer and outer layer a...
Embodiment 1
[0105] Embodiment 1 of the present invention provides a kind of three-layer co-extrusion packaging film, and it comprises inner layer, middle layer and outer layer three parts that are arranged sequentially from inside to outside; By weight, the preparation raw material of described inner layer comprises 20 Parts of low-density polyethylene-1, 30 parts of linear low-density polyethylene-1, 5 parts of metallocene linear low-density polyethylene-1, 20 parts of high-density polyethylene-1; Including 20 parts of low-density polyethylene-2, 30 parts of linear low-density polyethylene-2, 5 parts of metallocene linear low-density polyethylene-2, 20 parts of high-density polyethylene-2, 2 parts of masterbatch; by weight In total, the raw materials for the preparation of the outer layer include 20 parts of low-density polyethylene-3, 30 parts of linear low-density polyethylene-3, 5 parts of metallocene linear low-density polyethylene-3, and 20 parts of high-density polyethylene-3.
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Embodiment 2
[0113] Embodiment 2 of the present invention provides a kind of three-layer co-extrusion packaging film, and it comprises inner layer, middle layer and outer layer three parts that are arranged sequentially from inside to outside; By weight, the preparation raw material of described inner layer comprises 50 Parts of low-density polyethylene-1, 25 parts of linear low-density polyethylene-1, 60 parts of metallocene linear low-density polyethylene-1, 10 parts of high-density polyethylene-1; Including 50 parts of low-density polyethylene-2, 25 parts of linear low-density polyethylene-2, 60 parts of metallocene linear low-density polyethylene-2, 10 parts of high-density polyethylene-2, 10 parts of color masterbatch; by weight In total, the raw materials for the preparation of the outer layer include 50 parts of low-density polyethylene-3, 25 parts of linear low-density polyethylene-3, 60 parts of metallocene linear low-density polyethylene-3, and 10 parts of high-density polyethylen...
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