PE: unstretched polyethylene, density: 0.96 g/cm3. Not sinking in water, flammable, burning when the flame is blue, the upper part is yellow, and there is a paraffin smell. The flexible packaging industry commonly uses low density (LDPE), linear low density (LLDPE), high density (HDPE), and is divided into casting (CPE) and blowing (IPE) according to different processing methods. PE is currently the largest material used in heat sealing materials.
Main Performance:
1. The film is white and transparent and soft.
2, cold and low temperature resistance, good thermal stability, thick film can be sterilized in hot water 90-105 ° C, more than 90 ° C easy to deform, more than 105 ° C will melt.
3, good moisture resistance, stable chemical properties, excellent chemical resistance, insoluble in common solvents.
4, has a very low gas permeability, so when used as anti-oxidation food packaging, storage should not be too long.
5, and the oil and fat is poor, can slowly dissolve the product, so when packaging fat and oil foods, long-term storage will make the food contain waxy taste.
6, long-term exposure to ultraviolet light and heat will age, making its physical properties gradually deteriorate.
7, excellent heat sealing performance, commonly used in the inner layer of plastic composite bags.
Use:
1, food packaging: cakes, candy, roasted seeds and nuts, candied fruit, milk powder, sugar, salt, tea, fish pine, seasonings;
2, fiber products: shirts, clothing
3, paper supplies packaging
BOPA: a biaxially stretched nylon film with a density of 1.15g/cm3, which is flammable and has a burning odor of nails and wool when burned.
Main Performance:
1, oil resistant, organic solvent resistant, non-toxic, no odor, colorless, transparent.
2, good printability, tensile strength, wear resistance, good needle penetration resistance.
3, high pressure strength
4. Excellent oxygen barrier performance, excellent cold resistance, heat resistance and good oil resistance.
5, easy to absorb moisture, greater moisture permeability, weaker strength, easy to wrinkle.
Main uses: oil-based fried foods, frozen foods, vacuum packaging, retort sterilization foods, dairy products. It is commonly used in packages containing frozen foods that need to resist external puncture.
PET: Biaxially stretched polyester film with a density of 1.4g/cm3, flammable, a lot of black smoke when burning, and black fragments and benzene smell.
Main Performance:
1. High mechanical strength: The tensile strength is equal to 5~10 times of PE. Strong and good impact resistance.
2, heat resistance and cold resistance is good, high temperature 240 ° C is still stable.
3, good oil resistance, good resistance, acid resistance, poor alkali resistance.
4, water and water vapor transmission is small, moisture, and excellent resistance.
5. The ability to isolate oxygen and moisture is relatively poor, but it has excellent perfume retention properties.
6, good transparency, to prevent poor UV transmission. Main use: It is commonly used in the production of retort pouches and vacuum aluminized substrates, packaging broth, frozen food, rice cake, or tea.
