Raw materials used in plastic thermoforming? What are those? - - - - - - Union star packaging machinery

Thermoplastic plastic film under the condition of heating can stretch, but found on the basis of different materials and different tensile conditions, the tensile properties can vary greatly. Therefore, when making thermoforming on forming method, temperature, heating, mold materials, the choice of the form of mould cooling careful consideration. Hard PVC sheet, toughening polystyrene, two-way stretch polystyrene, expanded polystyrene, abs, LDPE, HDPE, pp and other polycarbonate film can be used in thermoforming. ( A) Has a good transparence of PVC PVC sheet, tenacity and chemical resistance, and it's easy to hot forming, can is it stick to merge well with the mold can be made very thin thermoforming products. Can be used to cover type packaging and a variety of food packaging, in addition, because the PVC has self-extinguishing, particularly for aircraft and other special requirements of food. ( 2) Toughening PS toughening PS thermoforming material is a kind of is widely applied. Thermoforming and it is easy to get more hard containers, can be used as a disposable drinking cup, ice cream boxes, etc. ( 3) Polystyrene (two-way stretch orientation 博普爵士乐) Toughening PS is not transparent, can not meet the requirement of the transparency has occasion. And ordinary transparent PS is too fragile, cannot satisfy the use requirement, only the ordinary transparent PS film after two-way stretch, to get sufficient toughness, after hot forming crystal can be made into a transparent container. However, BOPS thermoforming is difficult, this is due to the stress exist in the film, weeks this need special forming device. ( 4) Expanded polystyrene sheet expanded polystyrene sheet are opaque, its surface is very beautiful, and have good insulation and vibration, can be used as a fast food lunch boxes and other food containers and packaging of electronic instruments. But the expanded polystyrene sheet heat preservation also brought difficulties to thermoforming, this is because it has a very low coefficient of thermal conductivity. Therefore, how to effectively fast heating and not cause local overheating has become a prominent problem. ( 5) ABS ABS thermoforming properties and the toughening of PS is similar, also has good toughness and can do more than the toughening PS thin, however, due to its high cost limits its use. ( 6) LDPE and HDPE despite heating of LDPE melt dripping phenomenon, but still can be used for hot forming, products is quite soft. Since HDPE LDPE more firm and hard, so it's easier than LDPE thermoforming. When heated, HDPE film easy to fold and stick together, so be quick heating ( Double heating) And strictly control the temperature of the film.