We can often see so many kinds of plastic products in the market, in our live, but we rarely know that how plastic products are made. Now let me have a briefly introduction for several molding processes of plastic. It does not mean that all plastic products are produced by these processes, but most of them are.
Thermoplastic resin obtained by extrusion or injection molding of tubular plastic, heated to a softened state, placed in the folio mold, immediately after closing the mold in the billet into the compressed air, so that the plastic billet blowing and clinging to the inner wall of the mold, after cooling off the mold, that is, to obtain a variety of hollow products.
Blow molding is used for bottles, barrels, cans, boxes and all containers, balls, bellows and toys for packaging food, beverages, cosmetics, pharmaceuticals and everyday products, fuel tanks, car shock absorbers, seat backs, center brackets, armrests and headrest covers.
The injection molding machine uses the nature of molten plastic to melt into liquid after heating to a specified temperature, injecting the molten liquid into the closed cavity with high pressure, cooling and shaping, then opening the mold and pushing out to get the desired plastic product. Injection molding is often use for the small plastic products and have a more precise dimensional requirements and suitable for large quantity needs.
Rotational molding is to add the measured liquid plastic to the mold first, after the mold is closed, make it rotate along the two vertical rotation axis, while making the mold heated, the plastic materials in the mold under the action of gravity and heat, gradually and evenly coated, molten adhesion on the entire surface of the mold cavity, molding the same shape as the mold cavity, and then cooled and shaped, demolded to make the desired shape of the product.
Rotational molding is mainly used to large hollow products such as handling boxes, tipping hulls, sailboat hulls, clothing models, industrial tanks and storage tanks, etc. for processing seamless hollow products.
Also known as thermoforming, also called by vacuum forming. It is a special plastic processing method in which thermoplastic sheets are processed into various products. The sheet material is clamped on the frame and heated to a softened state, and under the action of external force, it is made to close to the molding surface of the mold to obtain a shape similar to the molding surface. After cooling and shaping, the finished product is ready to be finished.
In recent years, thermoforming has made new progress, such as continuous production technology from extruding sheets to thermoforming.
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