Plastics can be divided into thermoplastics and thermos […]
Plastics can be divided into thermoplastics and thermosets according to their heating behavior. The materials used for thermoforming are mostly thermoplastic materials.
The single or multi-layer composite plastic sheet (board) used for thermoforming must have the following process properties.
1: plastic memory
2: hot stretching
3: thermal strength
4: molding temperature
Thermoforming commonly used plastics:
A PVC (characterized by less impurity content, better transparency, lower price, good dielectric properties, flame retardancy and self-extinguishing)
Di PP (rich source, cheap price, excellent performance, wide range of uses.
1, low density (PP colorless, odorless, tasteless, non-toxic, flammable, white appearance, density is 0.90~0.91g/cm3.)
2, good mechanical properties PP rigidity, excellent elongation, good resistance to stress cracking
3, teach good heat resistance
4, good chemical stability
5, transparency, water and water resistance
6, processing and use is strong
Three blister packaging machine PE (one of the largest and most widely used plastic varieties, odorless, tasteless, non-toxic, flammable)
Four PS (plastic is hard, brittle, transparent, no smell, black smoke when burning, easy to dye and process, low hygroscopicity, dimensional stability, electrical insulation and thermal insulation.)
1, high transparency and gloss
2, coloring, excellent hygiene
3, excellent dielectric properties
4, excellent molding performance
Inadequacies:
1, sexual fragility
2, heat resistance teaches poor
3, moisture-proof, poor oxygen barrier
Five ABS (opaque, non-toxic, tasteless)
Six PET (colorless, odorless, tasteless, non-toxic, excellent transparency, excellent mechanical strength, abrasion resistance and electrical insulation properties, good creep resistance, rigidity and strength. Excellent hygiene makes it possible Direct contact with food)
