Multi-functional multi-layer composite film for preserving fruits and preparation method thereof
A multi-layer composite, functional layer technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of uncontrollable sulfur dioxide concentration, excessive sulfur content in food, human body hazards, etc. The effect of controllable concentration and cycle, low production cost and low processing cost
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Embodiment 1
[0032] Using LDPE resin as the basic raw material, add 1% white carbon black powder with a particle size of 5-20 microns to the LDPE resin, and then obtain the LDPE base film under the condition of an inflation ratio of 1:3; in three-color printing equipment On the LDPE base film, the release agent layer, auxiliary layer and protective layer are coated in sequence, and the amount of glue is 2-5g / m 2 The composition of the release agent layer is 5 parts of calcium sulfite powder, 90 parts of VAE aqueous emulsion (equivalent to 45 parts of dry matter weight) with a solid content of 50%; the composition of the auxiliary layer is 7 parts of citric acid, with a solid content of 50% 90 parts of VAE aqueous emulsion (equivalent to 45 parts of dry matter weight); the composition of protective layer is that solid content is 10 parts of VAE aqueous emulsion (equivalent to 5 parts of dry matter weight), and solid content is 100 parts of natural rubber aqueous emulsion of 50% parts (equiv...
Embodiment 2
[0034] Using LDPE resin as the basic raw material, add 3% white carbon black powder with a particle size of 5-50 microns to the LDPE resin, and then obtain the LDPE base film under the condition of an inflation ratio of 1:3; in three-color printing equipment On the LDPE base film, a release agent layer, an auxiliary layer and a protective layer are coated sequentially; other conditions are the same as in Example 1.
Embodiment 3
[0036] Using a commercially available biaxially stretched polypropylene film (BOPP) as the base film, a release agent layer, an auxiliary layer and a protective layer are sequentially coated on the BOPP base film on a three-color printing device; other conditions are the same as in Example 1.
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