The difference between PET and PVC
polyester resin ( PET) , appearance: transparent. Combustibility: flammable, leave the burning flame. Near flame namely shrinkage, fusion fuel, leave the blaze to continue burning, a few cigarettes, have very weak sweet, hard round ash, dark or light brown.
the difference between PP and PE can see the melting point, melting point is 120 ℃ or so of PE, PP for around 150 ℃.
PVC membrane ( Polyvinyl chloride) Nature is translucent, yellowish luster. Transparency is better than polyethylene, polypropylene, difference in polystyrene, along with the different dosage of additives, can be divided into soft and hard polyvinyl chloride (PVC), soft soft, tough, feel sticky, hard ware hardness is higher than that of low density polyethylene, but lower than that of polypropylene, can appear in the inflectional bleaching. When heated PVC particles ( Below the melting point) Change with temperature change characteristics, and it is suitable for extrusion of molten state, which is one tuo material down within the mold can easily direct forming.
in general, the two kinds of bottle can have juncture, bottle is some at least, that's when the mould clamping is left, it is a good mould will have a thin line.
1。 The room temperature filling bottle blowing bottle such as mineral water, mold is required for cooling, the temperature below 50 degrees, and when the hot filling bottle of bottle blowing mold needs heating in 130 degrees of above;
2。 Price difference is mainly is the difference in price of raw materials, and blow molding equipment and technology, of course, there are also some relations;
3。 Moulding line mainly affect the appearance, little impact on the performance should be
PVC blister of the most commonly used material, soft, strong toughness, good plasticity, but make it transparent and a variety of colors, commonly used transparent PVC packaging electronics, cosmetics, toys, gifts and other products. PET qualitative hard, good toughness, high strength, surface brightness, environmental non-toxic, transparent and a variety of color sheet. Defect is PET high frequency thermal bonding is difficult, the price is more expensive than PVC, this material has often been asked customers high-grade and environmentally friendly products to replace PVC, PET materials typically used for plastic bottle, food packing box and so on PS density is small, Light) , environmental non-toxic, plasticity is very good, poor ductile brittle, not make it bright material, therefore can only make the collet type blister, because of its easy to crack, the blister should not be recycled PP material special soft, good toughness and environmental protection non-toxic, high temperature resistant, has often been made catering utensils or other high temperature resistant products packaging; But its poor plasticity, processing is difficult, the surface gloss, and process color will be shallow