Multilayer coextruding pyrocondensation film
A heat-shrinkable film, multi-layer co-extrusion technology, used in layered products, synthetic resin layered products, grafted polymer adhesives, etc. and other problems, to achieve the effect of good transparency, good anti-pollution heat sealing and good gas barrier properties
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Embodiment 1
[0024] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 60kg of ethylene-alpha olefin copolymer and 40kg of ethylene-EMAA copolymer, the density of ethylene-alpha olefin copolymer is 0.88g / cm 3 . Heat seal layer C: 50kg of ethylene-propylene copolymer and 50kg of LLDPE, the density of ethylene-propylene is 0.88g / cm 3 , the density of LLDPE is 0.90g / cm 3 . Adhesive layer D and adhesive layer E: 5kg of EVA with a density of 0.93g / cm 3 .
[0025] The raw materials of each layer are added to the extruder of each layer to melt and plasticize, and then enter a multi-layer co-extrusion circular die to distribute the melt to form a multi-layer circular melt tube; The body tube blank is cooled and formed by vacuum sizing, and then enters the hot water tank to be heated to a suitable blowing temperature, and the compressed air is filled between two pairs of nip rollers for horizontal blowing an...
Embodiment 2
[0027] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 50kg of various ethylene-alpha olefin copolymers and 50kg of ethylene-EAA copolymers, the density of various ethylene-alpha olefin copolymers is 0.917g / cm 3 . Heat seal layer C: 60kg of ethylene-butene copolymer and 40kg of POP, the density of ethylene-butene copolymer is 0.917g / cm 3 , the density of POP is 0.92g / cm 3 . Adhesive layer D and adhesive layer E: 25kg of EVA with a density of 0.94g / cm 3 .
[0028] Other methods and structures are the same as in Embodiment 1.
Embodiment 3
[0030] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 100 kg of ethylene-EVA copolymer. Heat seal layer C: 100kg of ethylene-hexene-1 copolymer, the density of ethylene-hexene-1 copolymer is 0.90g / cm 3 . Adhesive layer D and adhesive layer E: 5 kg of maleic anhydride-modified ethylene polymer.
[0031] Other methods and structures are the same as in Embodiment 1.
[0032]After testing, the main performance indicators of the multi-layer co-extruded heat shrinkable film obtained by adopting the technical solution of the present invention are shown in Table 1.
[0033] Table 1
[0034] Test items
Example 1
Example 2
Example 3
Longitudinal and transverse tensile strength
56MPa
58MPa
50MPa
Longitudinal and transverse elongation at break
110%
115%
113%
Seal strength
15N / 15mm
17N / 15mm
16N / 15mm
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