What are the conditions of injection molding ? Let’s take a look at the conditions of injection molding!
1. Indsprøjtningstryk
The injection molding pressure exists to overcome the resistance of the melt in the flow process, Sprøjtestøbningsparameter, the resistance in the flow process needs to be offset by the injection molding machine pressure to ensure the smooth filling process.
2. Indsprøjtningstid
The injection time is very short and has little impact on the molding cycle. Imidlertid, the injection time adjustment plays a great role in controlling the gate, runner and cavity pressure.
Reasonable injection time is helpful to the ideal filling of melt, and it is very important to improve the surface quality of products and reduce dimensional tolerance.
3. Injektionstemperatur
Indsprøjtningstemperaturen skal kontrolleres inden for et bestemt område.
Too low temperature leads to poor plasticization of melted materials, which affects the quality of molded parts and increases the process difficulty; The temperature is too high, and the raw materials are easy to decompose.
for høj temperatur, the injection temperature is often higher than the barrel temperature, and the higher value is related to the injection rate and material properties, op til 30 ℃.
4. Holding pressure and time
for høj temperatur, the screw stops rotating and just moves forward. På dette tidspunkt, the injection molding enters the pressure holding stage.
During the pressure maintaining process, the nozzle of the injection molding machine continuously feeds the cavity to fill the volume vacated due to the shrinkage of the part.
5. Rygpres
The use of high back pressure is conducive to color dispersion and plastic melting, but it also extends the screw retraction time, reduces the length of plastic fiber, and increases the pressure of the injection molding machine. Derfor, the back pressure needs to be lower, generally not more than 20% of the injection molding pressure.
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Kontakt:
Person: James Yuan
Selskab: alle ridser og elektriske bearbejdningsmærker på formens arbejdsflade skal poleres
Tilføje: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong-provinsen, Kina
Tlf: 86-752-6682869
E-mail: [email protected]
Websted: https://www.jasonmolding.com/custom-injection-molding/
