A relatively special plastic processing method for processing thermoplastic (see thermoplastic resin) sheets into various products. The sheet is clamped on the frame and heated to a softened state, and under the action of external force, it is made close to the profile of the mold to obtain a shape similar to the profile. After cooling and shaping, the finished product is finished. This process is also used in rubber processing. In recent years, there have been new advances in thermoforming, such as continuous production techniques from extruded sheet to thermoforming.
There are dozens of thermoforming methods, and vacuum forming is one of its representatives. The heat-softened sheet is formed against the surface of the mold using a vacuum. This method is the simplest, but the pressure difference caused by vacuuming is not large, and it is only used for products with simple appearance.
Using compressed air or steam pressure, the heat-softened sheet is forced against the surface of the mold to form. Because the pressure difference is larger than that of vacuum forming, products with complex shapes can be manufactured.
The heated and softened sheet is placed between the paired female and male molds, and formed with the help of mechanical pressure. This method has higher molding pressure and can be used to manufacture products with complex shapes, but the mold cost is higher.
④Plunger pressure forming
Partially pre-stretching the heated sheet with a plunger or a male mold, and then molding with vacuum or air pressure, can produce products with large depth and uniform wall thickness distribution.
⑤Solid phase forming
The sheet is heated to a temperature that does not exceed the melting point of the resin, keeping the material in a solid state for shaping. For ABS resin, polypropylene, high molecular weight high density polyethylene. The rigidity and strength of the parts are higher than those of general thermoforming products.
Two sheets are stacked together, and air is blown in the middle to make large hollow parts. A kind of special processing method for processing thermoplastic sheet materials into various products. The sheet is clamped on the frame and heated to a softened state. Under the action of external force, it is made close to the mold surface, and the product is obtained after cooling and shaping. , This method is also used in rubber processing. Compared with injection molding, it has the advantages of high production efficiency, less equipment investment and the ability to manufacture products with larger surface areas. The plastics used are mainly polystyrene, polyvinyl chloride, polyolefin, etc.
There are many molding methods, all of which are combined or improved on the basis of vacuum, air pressure or mechanical pressure. It can be used to generate eating utensils, toys, hats and helmets, as well as auto parts, architectural accessories, chemical equipment, etc. A processing method for manufacturing plastic products with thermoplastic sheets as raw materials. The sheet cut into a certain size and shape is clamped on the frame of the mold, heated and softened, and then pressure is applied to make it close to the molding surface of the mold to obtain a similar shape, and the product is obtained after cooling, shaping and trimming. The thickness of the sheet used for forming is generally 1 to 2 mm, and the thickness of the product is always less than this value.
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