What are the manufacturing processes of plastic stools, the techniques and procedures used, and some details
Mold temperature: mold temperature has a great influence on the internal properties and apparent quality of the products. The mold temperature depends on whether or not the plastic is crystalline, the size and structure of the product, the performance requirements, as well as other process conditions (melting temperature, injection speed and injection pressure, molding cycle, etc.).
Pressure control in injection molding process, including two kinds of pressure and injection pressure, and directly affect the plasticization of plastics and product quality.The plasticization pressure: (backpressure) by injection machine screw, the screw at the top of the melt in the screw rotation is backward when the pressure is called plastic pressure, or pressure. The magnitude of this pressure can be adjusted by an overflow valve in the hydraulic system. After the injection, plastic pressure is with screw design, product quality requirements and different kinds of plastics and need to change, if these conditions and screw speed are constant, increase the plasticization pressure will enhance the shearing action, which will increase the melt temperature, but decrease the plasticizing efficiency, increase countercurrent and the leakage current, increase drive power.In addition, increasing the plasticizing pressure often makes the temperature of the melt even, and the pigment mixture is mixed evenly and the gas in the melt is discharged. In general operation, the determination of plasticizing pressure should be as low as possible under the condition that the quality of the product is guaranteed. The specific value varies depending on the variety of the plastic used, but usually less than 20 kg / cm2.
Nozzle temperature: the nozzle temperature is usually slightly lower than the maximum temperature of the barrel, this is to prevent the melt in the nozzle may occur through the salivation phenomenon "". Nozzle temperature can not be too low, otherwise it will cause early melting of the melt, and will plug the nozzle, or because the early condensate into the mold cavity and affect the performance of the product.
The temperature control of the barrel temperature, injection molding process to control the temperature of barrel temperature and nozzle temperature and mold temperature etc.. The first two kinds of temperature mainly affect the plasticization and flow of plastics, and the latter mainly affects the flow and cooling of plastics. Each kind of plastic has different flow temperature, with a plastic, or as the source of different grades, the flow temperature and decomposition temperature is different, this is because the average molecular weight and molecular weight distribution caused by the different plasticizing process in different types of plastic injection machine in is different, so the selection of materials the cylinder temperature is not the same.
The manufacture of plastic stools belongs to the injection molding process, and the selection of raw materials can be determined according to the demand! Raw materials, according to your location, I can help you choose affordable ~!
