Introduce two kinds of film blown film production of the most often thin film

Introduce two kinds of film blown film production of the most often thin film

Two-way stretch polypropylene film is formed by polypropylene granules by co-extrusion sheets, then through vertical and horizontal two bias made by stretching. Because tensile molecular orientation, so the film physical stability, mechanical strength, good air tightness, high degree of transparency and light, strong wear resistance, is currently the most common application of printing film, usually applied thickness is 20 ~ 40 microns, and application of the most common of 20 microns. Two-way stretch polypropylene film tension faults are poor heat sealing, so often used as the outer membrane of composite membrane, such as with polyethylene film composite after moisture resistance, transparency, strength, stiffness and printing are ideal, practical in dress dry food. Because the bidirectional tensile appearance for non-polar polypropylene film, high crystallinity, free energy is low in appearance, therefore, the printing performance is poorer, to the poor adhesion of inks and adhesives, take necessary before printing and composite processing appearance of punishment.

Dalian blown film machine manufacturer says, density polyethylene film usually accept blow molding and flow two kinds of technology. Stretch film polyethylene film thickness symmetry, but because the price is higher, the rarely used. Blow molding polyethylene film is made by blow molding grade PE particles by blow molding machine blowing, and the cost is low, so the most common. Low density polyethylene film is a translucent, there is light, texture is soft film, has excellent chemical stability, heat sealing, water resistance and moisture resistance, freezing resistance, can be boiled. The stress is poorly insulated for oxygen, used in the inner membrane of composite flexible packaging material, and also the most prevalent, the current application dosage is one of the biggest plastic packaging film, about 40% of plastic packaging film consumption. Because does not contain polyethylene molecules in polar groups and high crystallinity, free energy is low in appearance, therefore, the film printing performance is poorer, to the poor adhesion of inks and adhesives, therefore take necessary before printing and complex aspects dealing with punishment.