Controle de temperatura
Temperatura do barril: processo de moldagem por injeção to control the temperature of the barrel temperature, temperatura do bico e temperatura do molde. Os dois primeiros tipos de temperatura afetam principalmente a plastificação e o fluxo de plásticos, e o último afeta principalmente o fluxo e resfriamento de plásticos. Cada plástico tem uma temperatura de fluxo diferente, e a temperatura de fluxo e temperatura de decomposição do mesmo plástico variam dependendo da fonte ou marca, due to the difference in average molecular weight and molecular weight distribution. The plasticizing process of plastics in different injection machines is different, so the temperature of the selected cartridge is different.
Temperatura do bico: nozzle temperature is usually slightly lower than the top temperature of the barrel to prevent the “salivation” that may occur in the straight-through nozzle. The nozzle temperature should not be too low, por outro lado, the nozzle will be blocked by the early solidification of the melt, or the properties of the product will be affected by the injection of the early solidification into the die cavity.
Temperatura do molde: mold temperature has a great impact on the internal properties and apparent quality of products. Mold temperature depends on the crystallinity of plastics, tamanho e estrutura dos produtos, requisitos de desempenho, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.)
Pressure control
Injection pressure includes plasticizing pressure and injection pressure, and directly affects plastic plasticization and product quality.
When a screw injector is used, the pressure on the top of the screw is called plasticizing pressure, also known as the back pressure, when the screw rotates and recovers. This pressure can be adjusted by the relief valve in the hydraulic system. In injection, the size of the plasticizing pressure needs to change with the design of the screw, the quality requirements of the product and the type of plastic. If these conditions and the rotating speed of the screw do not change, increasing the plasticizing pressure will strengthen the shearing effect. The melt temperature will be increased, but the plasticizing efficiency will be reduced, the countercurrent and leakage will be increased, and the driving power will be increased.
Além disso, increasing the plasticizing pressure can make the melt temperature uniform, the color mixture uniform and the gas discharged from the melt. In general operation, the determination of plasticizing pressure should be as low as possible on the premise that the quality of the product is good. The specific value varies according to the type of plastics used, but usually rarely exceeds 20 kg / square centimeter.
Pressão de injeção: in current production, the injection pressure of almost all injection machines is plastic at the top of the plunger or screw
The applied pressure (converted from the oil line pressure) shall prevail. The role of injection pressure in injection molding is to overcome the flow resistance of plastic flowing from the cylinder to the cavity, to give the filling rate of the melt material and to compaction the melt material.
molding cycle
Forming cycle: forming cycle directly affects labor productivity and equipment utilization. Portanto, no processo de produção, the quality should be guaranteed, as far as possible to shorten the molding cycle of the relevant time. Injection time and cooling time are the most important factors in the whole molding cycle, which have a decisive effect on the quality of the product. The filling time in injection time is inversely proportional to the filling rate, and the filling time in production is generally about 3-5 segundos. The pressure holding time of injection time is the pressure time of plastic in mold cavity, which accounts for a large proportion in the whole injection time, which is usually about 20-120 segundos (até 5 ~ 10 minutes for extra thick parts). Before the melting material is frozen at the gate, the pressure holding time has an effect on the accuracy of the product size, and if it is later, it will have no effect on the size accuracy of the product. The pressure-holding time also has the most favorable value, which is known to depend on the feed temperature, mold temperature, and the size of the main channel and gate. If the dimensions and process conditions of the main channel and gate are normal, the pressure value of the minimum range of shrinkage of the product is usually obtained. The cooling time mainly depends on the thickness of the product, the thermal properties and crystallization properties of plastics, and mold temperature. The end point of cooling time should be based on the principle that no change will be caused when the product is demoulded. The cooling time is generally between 30 e 120 segundos, and the cooling time is unnecessary. It not only reduces the production efficiency, but also causes difficulties in demoulding for complex parts. Demoulding stress will even be produced when the mold is forced to be demoulded. Other times in the forming cycle are related to whether or not the production process is continuous and automated, and the degree of continuity and automation.
Sobre JasonMould Companhia Industrial Limitada
Jasonmould é um fabricante de moldes de plástico- molde de injeção, moldes de fundição sob pressão, moldagem por sopro de plástico, moldagem rotacional, moldagem por injeção de plástico médico, moldagem por injeção de plástico de dois disparos, inserir moldagem, sobremoldagem, moldagem por injeção de metal, moldagem por micro injeção, moldagem por injeção de pó, moldagem por injeção de cerâmica, moldagem por injeção de líquido, moldagem por injeção husky, molde doméstico, molde de fundição, ferramenta de molde, moldes personalizados, moldes da china, ferramentas de prototipagem rápida, ferramentas de prototipagem de plástico, ferramentas de punção, matriz e ferramentas para peças móveis / celulares, partes automotivas, aspirador de pó, ferramentas recarregáveis, telefones, copiadoras, computadores, alto-falantes multimídia, e muitos outros produtos eletrônicos e eletrodomésticos. E também um fabricante de produtos de plástico- peças plásticas, tanque de água de plástico, bolas de plástico, recipientes de plástico, fivela de plástico, âncora de plástico, cabide de plástico, colher de plástico, encaixe de tubo de plástico, tombo de plástico, talheres de plástico, copos de plastico, garrafas plásticas, bandeja de plastico, recipiente plástico de cosmético, caixa de plástico, recipiente de plástico para comida, cadeiras de plástico, tampas de plástico, tampa de plástico, tubos de plástico, canos de água de plástico, maçanetas de plástico, tubo de plástico, caixas utilitárias de plástico, prateleiras de plástico e assim por diante.
Contato:
Pessoa de contato: James Yuan
Nome da empresa: JasonMould Industrial Company Limited
Endereço: LongGang Village,LongXi Town,BoLuo County,Cidade de HuiZhou,Província de Guangdong, China
Telefone: 86-752-6682869
E-mail: [email protected]
Local na rede Internet: https://www.jasonmolding.com
