1. Polyester film
Polyester film has high mechanical strength, heat resistance, cold resistance, oil resistance, drug resistance, gas resistance and other properties, its thickness of 12 GM can be used, but many domestic polyester film temperature resistance is slightly poor, the flatness of the product is not very stable, which brings great difficulties to the operation and causes waste.
2. Aluminum foil
Aluminum foil has excellent gas resistance and moisture resistance, so it is very important to preserve the original flavor of food. It has strong protection, so that the package is not easy to be damaged by bacteria and mold; its shape is stable at high and low temperature; it has good shading and strong reflection ability to heat and light. Its thickness can be used in 7 μ m, the pinholes should be as few as possible, and the aperture should be as small as possible. In addition, its flatness must be very good, and the surface should be free of oil spots. Generally, domestic aluminum foil can not meet the requirements. Many manufacturers choose Korean and Japanese products.
3. Nylon
Nylon is not only good barrier, but also odorless, tasteless, non-toxic, especially puncture resistant, it has a weakness is not resistant to moisture, so to keep in a dry environment, once water absorption, its various performance indicators will decline, nylon thickness in 15gm can be used, in the composite, the best use of double-sided treatment of the film, if not double-sided treatment of the film, its untreated surface Composite with aluminum foil to ensure composite fastness.
4. Polypropylene
Polypropylene film used in high temperature cooking bag not only requires good flatness, but also has strict requirements on its tensile strength, heat sealing strength, impact strength and elongation at break. Only a few domestic products can be used, but the effect is not as good as that of imported raw materials. Its thickness is 60-70gm, and the surface treatment value is more than 40dyn.
5. Adhesive
The adhesive of cooking bag is required to have strong adhesion fastness, and it should be able to withstand high temperature of 121-135 ℃, and its glue loading amount is 4-5g / m2 dry weight. Many domestic composite plants use ad502, ad1010 and 503H.