The basic process of thermoforming is: sheet clamping → heating → forming → cooling → demoulding. Among them, molding is the most important and complex. Most of the thermoforming should be carried out on the molding machine, and there are great differences with different thermoforming methods. All kinds of molding machines do not have to complete the above five processes, but can be selected according to the actual production needs. The main parameters of the thermoforming machine are usually the maximum size and the maximum forming depth of the clamping device.
① clamping of materials. In order to prevent heat shrinkage and self weight sagging when using plastic sheet (sheet) cut to a certain size, it is necessary to clamp around the sheet (sheet) to maintain the shape of demoulding.
② heating. The heating system heats the plate (sheet) material to the required temperature at a fixed time and temperature to make the material in a high elastic state and ensure the smooth progress of the next forming process.
③ molding. The process of molding heated and softened plates (sheets) into desired shapes by means of molds and related devices.
④ cooling system. The plastic products with a certain temperature basically formed are cooled to the temperature below the thermal deformation temperature, so that the products are cooled and solidified. After the demoulding device is separated from the mold, the size is fixed, and the products are not deformed.