smd bearer tape

Carry PC material and PET material

1. From a conceptual perspective

PC (polycarbonate) : is a colorless transparent, clean and beautiful plastic. Because PC is non-toxic, odorless, prevents ultraviolet light from passing through, moisture-proof and fragrance-proof, has a wide temperature resistance range, is not brittle at -180 ° C, and can be used for a long time at 130 ° C, it is an ideal food packaging material.

PET: A crystalline, colorless, transparent, extremely tough material. Suzhou bearing with the appearance of glass, odorless, tasteless, non-toxic, flammable, burning with a blue edge of yellow flame, good air tightness.

2. From the point of view of characteristics and usefulness

PC: has good impact resistance, easy to form the characteristics, can be manufactured into bottles, cans and various forms of containers, used for packaging beverage, alcohol, milk and other fluid substances. The disadvantage of PC comparison in Kunshan bearing belt is stress cracking. In addition to the selection of high-purity raw materials and strict control of various processing conditions, the use of resin modification with low internal stress, such as a small amount of polyolefin, nylon, polyester and other melt blending, can significantly improve the stress cracking resistance and water resistance.

PET: The expansion coefficient is small, the molding shrinkage rate is low, only 0.2%, which is one-tenth of the polyolefin, smaller than PVC and nylon, so the size of the product is stable. The mechanical strength of the bearing belt is better, its expansion degree is similar to that of aluminum, the film strength is 9 times that of polyethylene, 3 times that of polycarbonate and nylon, and the impact strength is 3 to 5 times that of the general film. And the film has moisture-proof and fragrance-preserving properties. Although polyester has the above advantages, its film is more expensive, difficult to heat seal, easy to carry static electricity, so it is rarely used alone, mostly made of composite film with good heat seal resin coating.

Therefore, the PET bottle with two-axis extension blow molding method can give full play to the characteristics of PET, that is, it has good transparency, high surface gloss, and a glassy appearance, and Kunshan bearing belt is more suitable for replacing glass bottles.