Controllo della temperatura
Temperatura della canna: processo di stampaggio ad iniezione to control the temperature of the barrel temperature, temperatura dell'ugello e temperatura dello stampo. I primi due tipi di temperatura influenzano principalmente la plastificazione e il flusso della plastica, 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.
Temperatura dell'ugello: 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, altrimenti, 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.
con la premessa di soddisfare la qualità di plastificazione: mold temperature has a great impact on the internal properties and apparent quality of products. Mold temperature depends on the crystallinity of plastics, size and structure of products, requisiti di prestazione, and other process conditions (temperatura di fusione, injection speed and injection pressure, molding cycle, eccetera.)
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.
Inoltre, 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.
Pressione di iniezione: 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. Perciò, 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 secondi. 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 secondi (stampaggio ad iniezione di plastica ad alta precisione 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, temperatura dello stampo, 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 secondi, 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.
Di JasonMold Industrial Company Limited
Jasonmould è un produttore di stampi in plastica- stampo da iniezione, stampi per pressofusione, soffiaggio plastica, stampaggio rotazionale, stampaggio ad iniezione di plastica medica, stampaggio ad iniezione di plastica a due colpi, stampaggio a inserto, sovrastampaggio, stampaggio ad iniezione di metalli, micro stampaggio ad iniezione, stampaggio a iniezione di polvere, stampaggio ad iniezione di ceramica, stampaggio ad iniezione di liquidi, stampaggio a iniezione husky, muffa domestica, stampo per colata, strumento di stampo, stampi personalizzati, stampi per porcellana, strumenti di prototipazione rapida, strumenti di prototipazione in plastica, utensileria per punzonatrice, muoiono e utensili per parti di telefoni cellulari/cellulari, parti automobilistiche, aspirapolvere, strumenti ricaricabili, telefoni, fotocopiatrici, computer, altoparlanti multimediali, e molti altri prodotti elettronici ed elettrodomestici. E anche un produttore di prodotti in plastica- parti in plastica, serbatoio dell'acqua in plastica, palline di plastica, contenitori di plastica, fibbia di plastica, ancora di plastica, gancio di plastica, cucchiaio di plastica, raccordo per tubi in plastica, caduta di plastica, stoviglie di plastica, bicchieri di plastica, bottiglie di plastica, vassoio di plastica, contenitore cosmetico in plastica, contenitore di plastica, contenitore per alimenti in plastica, sedie di plastica, tappi di plastica, chiusura con tappo in plastica, tubi di plastica, tubi dell'acqua in plastica, manopole di plastica, tubi di plastica, scatole di plastica, rastrelliere di plastica e così via.
Contatto:
Referente: James Yuan
Nome della ditta: JasonMuld Industrial Company Limited
Indirizzo: Villaggio LongGang,Città di LongXi,Contea di BoLuo,HuiZhou Cityhou,Provincia di Guangdong, Cina
Telefono: 86-752-6682869
E-mail: [email protected]
Sito web: https://www.jasonmolding.com
