Controlul temperaturii
Temperatura butoiului: proces de turnare prin injecție to control the temperature of the barrel temperature, temperatura duzei și temperatura matriței. Primele două tipuri de temperatură afectează în principal plastificarea și curgerea materialelor plastice, and the latter one mainly affects the flow and cooling of plastics. Each plastic has a different flow temperature, and the flow temperature and decomposition temperature of the same plastic vary depending on the source or brand, 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.
Cerințe de control al temperaturii și întreținerea matriței în turnarea prin injecție: 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. Temperatura duzei nu trebuie să fie prea scăzută, in caz contrar, 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 mucegaiului: mold temperature has a great impact on the internal properties and apparent quality of products. Mold temperature depends on the crystallinity of plastics, dimensiunea și structura produselor, performance requirements, and other process conditions (temperatura de topire, 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.
în plus, 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.
Presiunea de injectare: 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. Prin urmare, in the production process, 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 secunde. 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 secunde (pâna la 5 La ce ar trebui să acordăm atenție atunci când turnarea prin injecție a plasticului TPE 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, temperatura mucegaiului, 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 și 120 secunde, 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.
Are loc o schimbare semnificativă a proprietăților fizice și chimice ale produsului plastic astfel format după procesul de răcire JasonMould Compania industrială limitată
Jasonmould este un producător de matrițe din plastic- matriță de injecție, matrițe de turnare sub presiune, turnare prin suflare din plastic, turnare prin rotație, Cinci elemente în matriță de plastic, turnare prin injecție din plastic în două shot-uri, turnare cu inserție, supraformare, turnare prin injecție a metalelor, turnare prin injecție micro, turnare prin injecție cu pulbere, turnare prin injecție ceramică, turnare prin injecție de lichid, turnare prin injecție husky, mucegai de uz casnic, mucegai de turnare, unealtă pentru matriță, matrite la comanda, mucegaiuri din china, scule de prototipare rapidă, scule de prototipare din plastic, scule de presare, matriță și scule pentru piese de telefon mobil / mobil, piese auto, aspiratoare, instrumente reîncărcabile, telefoane, copiatoare, calculatoare, difuzoare multimedia, și multe alte produse electronice și electrocasnice. Și, de asemenea, un producător de produse din plastic- piese din material plastic, rezervor de apă din plastic, bile de plastic, containere de plastic, cataramă din plastic, ancoră din plastic, cuier din plastic, lingura de plastic, racord de țevi din plastic, cadere din plastic, Veselă din plastic, pahare de plastic, sticle de plastic, tava de plastic, recipient pentru cosmetice din plastic, Cutie de plastic, recipient de plastic pentru alimente, scaune din plastic, capace din plastic, închidere capac plastic, tuburi din plastic, conducte de apă din plastic, butoane din plastic, tuburi din plastic, cutii utilitare din plastic, rafturi din plastic și așa mai departe.
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Persoană de contact: James Yuan
Numele companiei: JasonMould Industrial Company Limited
Abordare: Satul LongGang,Orașul LongXi,Județul BoLuo,Orașul HuiZhou,Provincia Guangdong, China
Telefon: 86-752-6682869
E-mail: [email protected]
Site-ul web: https://www.jasonmolding.com
