Taizhou Pinsum Furniture Co.,Ltd
Model No.: P-235
Product Size: L51*W45*H81cm
Seat Height: 45cm
Material: Polypropylene (PP)
Place of Origin: China
Plastic chair manufacturing belongs to the injection molding process, the selection of raw materials can be set according to demand!
First, the temperature control ⒈ barrel temperature: injection molding process need to control the temperature of a barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of the plastic, and the latter mainly affects the flow and cooling of the plastic. Each plastic has a different flow temperature, the same plastic, due to different sources or grades, the flow temperature and decomposition temperature is different, which is due to the average molecular weight and molecular weight distribution due to different types of plastic injection Machine plasticizing process is different, so choose the barrel temperature is not the same.
⒉ nozzle temperature: nozzle temperature is usually slightly lower than the barrel maximum temperature, which is to prevent the melt in the through-nozzle may occur "salivation phenomenon." Nozzle temperature should not be too low, otherwise it will cause premature frit material will clog the nozzle, or due to the early condensate into the mold cavity and affect the performance of the product.
⒊ mold temperature: mold temperature on the intrinsic properties of the product and the apparent quality of great influence. Mold temperature depends on the level of crystallinity of plastic, the size and structure of the product, performance requirements, as well as other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).
Second, the pressure control Injection molding process pressure, including plasticization pressure and injection pressure of two, and directly affect the plasticization of plastics and product quality.
⒈ Plastic chair plasticization pressure: (back pressure) When the screw-type injection machine, the top of the screw melt screw screw back when the pressure is called plasticizing pressure, also known as back pressure. The size of this pressure can be adjusted by the pressure relief valve in the hydraulic system. In injection, plasticizing pressure is the size of the screw design, product quality requirements and the type of plastic and need to be changed, if these conditions and the screw speed are the same, then increase the plasticizing pressure will enhance the shear The role of that will increase the melt temperature, but will reduce the plasticization efficiency, increase the countercurrent and leakage, increase drive power.
In addition, increasing plasticizing pressure can make the temperature of the melt uniform, mix the pigment evenly and discharge the gas in the melt. In general operation, the pressure of plasticizing should be as low as possible on the premise of ensuring good product quality. The exact value varies with the type of plastic used, but rarely exceeds 20 kg / cm².
⒉ Plastic chair injection pressure: In the current production, almost all of the injection machine injection pressure is based on the top of the plunger or screw pressure applied by the plastic (calculated by the oil pressure) shall prevail. Injection pressure plays a role in injection molding by overcoming the resistance of the plastic from flowing from the cylinder to the cavity, by the rate at which it is charged, and by compaction of the melt.
Third, the molding cycle to complete an injection molding process, the time required for molding cycle, also known as the molding cycle. It actually includes the following sections: Molding cycle: Molding cycle directly affects labor productivity and equipment utilization. Therefore, in the production process, should ensure the quality of the premise, as soon as possible to shorten the molding cycle of the relevant time. In the entire molding cycle, the injection time and cooling time of the most important, they have a decisive impact on the quality of the products. Injection time in the mold filling time is inversely proportional to the filling rate, filling time in production is generally about 3-5 seconds. The dwell time in the injection time is the pressure time of the plastic in the cavity, which accounts for a large proportion of the injection time, usually about 20-120 seconds (the special parts can be as high as 5 to 10 minutes). Melting at the gate before the melt, the number of dwell time, the size of the product accuracy, if later, no effect. Doubling time also has the best value, it is known that it depends on the material temperature, mold temperature and the size of the main runner and gate. If the main runner and the gate size and process conditions are normal, usually that is the smallest product of the shrinkage rate of the pressure value shall prevail. Cooling time mainly depends on the thickness of the product, plastic thermal properties and crystallization properties, and mold temperature. The end of the cooling time should be to ensure that the product does not cause changes in the demoulding principle, the cooling time is generally about 30 to 120 seconds, the cooling time is not necessary, not only reduce production efficiency, the complex parts will also Resulting in demoulding difficulties, demolding even forced demoulding stress. Other times in the molding cycle are related to whether the production process is continuous and automated, and the degree of continuity and automation.Plastic chair
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