The production of plastic products generally includes t […]
The production of plastic products generally includes the formulation, molding, machining, joining, modification and assembly of plastics. The latter four processes are carried out after the plastic has been formed into a product or a semi-finished product, also known as plastic secondary processing.
The production of plastic products is the key to the processing of plastics. Various forms of plastic (powder, pellets, solution or dispersion) are made into articles or blanks of the desired shape. There are more than thirty methods of forming. Its choice depends mainly on the type of plastic (thermoplastic or thermoset), the starting form, and the shape and size of the product. Commonly used methods for plastic processing thermoplastics include extrusion, injection molding, calendering, blow molding, and thermoforming. Plastic processing thermosetting plastics are generally molded, transfer molded, and injection molded. Lamination, molding, and thermoforming are the shaping of plastic on a flat surface. The above plastic processing methods can be used for rubber processing. In addition, there are castings using liquid monomers or polymers as raw materials. Among these methods, extrusion and injection molding are used most and are the most basic molding methods.
Machining of plastic products production Plastic products such as metal and wood are used to produce plastic products of very precise or small quantities. They can also be used as auxiliary processes for forming, such as sawing of extruded profiles. Because plastic production can produce plastic products different from metal and wood, plastics have poor thermal conductivity, low thermal expansion coefficient and low elastic modulus. When the clamp or tool is too pressurized, it is easy to cause deformation and heat during cutting. Melted and easily adhered to the tool. Therefore, when the plastic is machined, the tools used and the corresponding cutting speeds must be adapted to the plastic characteristics. Commonly used machining methods include sawing, shearing, punching, turning, planing, drilling, grinding, polishing, and threading. In addition, plastic can also be cut, punched and welded by laser.