There are many methods of plastic thermoforming, which can be divided into two categories: compression molding and differential pressure molding according to the molding power. According to the forming mold, it can be divided into several methods such as single male mold, single female mold, paired mold, no mold, etc. Compression molding, also known as mechanical stretch molding, is a molding method in which plastic sheets are molded into various parts with the help of external mechanical pressure or self-weight in the form of a single mold or a pair of molds. The male mold means that the shape of the mold is convex, and the female mold means that the shape of the mold is concave. The mold only shapes one side of the product, and the other side is exposed to the air, which is different from the one-time molding process. This method is basically applicable to all thermoplastics.

Commonly used plastics for thermoforming 1. PET (strong thermoplastic, high transparency, environmental protection and no peculiar smell, mainly used in the production of food packaging products) 2. PP (rich in source, cheap in price, excellent in performance, and widely used.) 3. PVC (characterized by less impurity content, better transparency, lower price, good dielectric properties, flame retardancy and self-extinguishing) 1. Low density (PP is colorless, odorless, tasteless, non-toxic, flammable, white in appearance, density is 0.90~0.91g/㎝3.) 2. Good mechanical properties: PP is rigid, especially good in elongation, and has good stress crack resistance 3. Good heat resistance 4. Good chemical stability 5, Transparency, good water resistance and water resistance 6. Strong processing and usability 4.PE (it is one of the plastic varieties with high output and wide application, odorless, tasteless, non-toxic and flammable) 5.PS (plastic is hard, brittle, transparent, odorless, emits black smoke when burning, easy to dye and process, low hygroscopicity, dimensional stability, good electrical and thermal insulation.) 1. High transparency and gloss 2. Excellent colorability and hygienic properties 3. Excellent dielectric properties 4. Excellent molding performance

Commonly used plastics for thermoforming 1. PET (strong thermoplastic, high transparency, environmental protection and no peculiar smell, mainly used in the production of food packaging products) 2. PP (rich in source, cheap in price, excellent in performance, and widely used.) 3. PVC (characterized by less impurity content, better transparency, lower price, good dielectric properties, flame retardancy and self-extinguishing) 1. Low density (PP is colorless, odorless, tasteless, non-toxic, flammable, white in appearance, density is 0.90~0.91g/㎝3.) 2. Good mechanical properties: PP is rigid, especially good in elongation, and has good stress crack resistance 3. Good heat resistance 4. Good chemical stability 5, Transparency, good water resistance and water resistance 6. Strong processing and usability 4.PE (it is one of the plastic varieties with high output and wide application, odorless, tasteless, non-toxic and flammable) 5.PS (plastic is hard, brittle, transparent, odorless, emits black smoke when burning, easy to dye and process, low hygroscopicity, dimensional stability, good electrical and thermal insulation.) 1. High transparency and gloss 2. Excellent colorability and hygienic properties 3. Excellent dielectric properties 4. Excellent molding performance