To extend the expiration period of fleshy food, high temperature resistant the fleshy food that evaporate cooks all adopts vacuumize skin package. Aluminum foil composite material is when vacuumize, because the plasticity of aluminum foil is insufficient, stick completely very hard on content content, cause the air inside the bag that pack easily to smoke sordid, affect provision save. Accordingly, the ply when the goods that make the pork packs use aluminum foil cannot too tall. But cut off because of it again the gender depends on ply and treatment level, appear easily when ply is lesser many pinhole, use what the carnivorous that store tastes at be able to bear or endure to pack so, the ply of aluminum foil cannot too thin; If aluminum foil is too thin, compound film is in aluminum foil to form a lot of ruffles through still be being met after vacuumize, produce crackle extremely easily then, cause cut off sexual forfeiture. Accordingly, the ply of aluminum foil, cut off gender, plasticity is to perplex 3 contradiction that compound film applies aluminum foil from beginning to end.

Look from market respect, aluminum foil is compound because opaque and those who make consumer cannot see contents is lubricious,film packs food and form, go against consumer to buy, add some to produce manufacturer to use aluminous model compound film is opaque the flaw that covers a product, even practise fraud, entrap consumer. Accordingly, consumer chooses mostly completely transparent pack, and do not choose opaque aluminous model compound film is packed, the food that creates this kind to pack is sold not free. Aluminous model is compound pack cannot heat with microwave, as more expensive as case of rate of exchange of plastic film photograph, these affect aluminous model the application of compound film. Because this food machines course of study to hope to pack material craft all the time,can offer a kind to cut off quite gender and aluminous model are compound film is similar, but already completely transparent, the packing material that evaporate of ability high temperature boils replaces aluminous model compound film.

Be in what industry applies is at present plastic in, only PVDC plastic film is had already as similar as aluminum foil tall cut off the gender is had again high temperature resistant evaporate boils a gender. Long-term since, people hopes to use PVDC plastic make compound film as intermediate layer, become completely transparent high temperature resistant evaporate is boiled, what have similar aluminum foil again is tall cut off of the gender high temperature resistant the evaporate food that boil packs film. But PVDC is plastic it is a kind of function what machine extremely distinctly, hard is plastic, regard intermediate layer as to make compound film exist it a lot of difficulty.

PVDC plastic film was 1938 a kind of when by American path chemistry company scientist invents special technology that blow film is made those who come out. From 20 centuries use as all the time since 50 time the flesh that high temperature evaporate boils kind the casing of enema, the fleshy products with the classics antiseptic high temperature that packs with it is deposited below normal temperature, the expiration period is in 6 months above. But PVDC film can be heated up only with high frequency dielectric heating, and the method that cannot heat with the resistor that uses normally will heat up, come for years so PVDC film uses as only casing, and without legal system the bagging that become a parcel is used.
Previous 1 23 Next

Previous:Shallow talk about food goods shelves period, qualitative protect period the des
Next：The carriage fruity method that pack and requirement (3)