What are the conditions of injection molding ? Let’s take a look at the conditions of injection molding!
1. Injection pressure
The injection molding pressure exists to overcome the resistance of the melt in the flow process, or conversely, the resistance in the flow process needs to be offset by the injection molding machine pressure to ensure the smooth filling process.
2. Injection time
The injection time is very short and has little impact on the molding cycle. However, 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. Injection temperature
The injection temperature must be controlled within a certain range.
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.
In the actual injection molding process, the injection temperature is often higher than the barrel temperature, and the higher value is related to the injection rate and material properties, up to 30 ℃.
4. Holding pressure and time
At the end of the injection molding process, the screw stops rotating and just moves forward. At this time, 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. Back pressure
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. Therefore, the back pressure needs to be lower, generally not more than 20% of the injection molding pressure.
About Huizhou Dj Molding Co., Ltd
Dj Mold is a China mold maker of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer, mold manufacturer China– plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.
Person: James Yuan
Company: Huizhou Dj Molding Company Limited
Add: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Email: [email protected]