Injection molding machine factory together and you know about plastic injection machine back pressure.
Back pressure is a kind of injection mold
ing machine pressure, formed in the process of plastic melting and plasticizing, along with the continuous migration of melting as well as the quantity increased, gradually formed a pressure driven screw pushing back.
To prevent the screw back pressure, back pressure, by adjusting the injection cylinder oil return of throttle valve.
The benefits of proper calibration back pressure 1, the gases in the molten material & other;
Extrusion & throughout;
, reducing gas, internal air bubble on the surface of the products, improve gloss uniformity.
To slow down the speed of the screw back, make the liquid inside the gun barrel fully plasticizing, adding pigments, masterbatch and mixing evenness of melting, avoid products appear mixed color phenomenon.
2, slow speed of the screw back, make the liquid inside the gun barrel fully plasticizing, adding pigments, masterbatch and mixing evenness of melting, avoid products appear mixed color phenomenon.
3, can the molten material compaction within the gun barrel, increase the density, improve the resin content, the stability of the goods weight and size.
4, appropriately increase back pressure, can improve shrink and products around the glue on the surface of the products.
5, can increase the temperature of the molten material, make the molten material plasticizing quality improvement, improve the liquidity when molten material molding, product surface without cold glue lines.
So how to adjust the back pressure?
Injection of back pressure adjustment should be according to the condition of the performance of the raw material, dry, product structure and quality condition and decide, back pressure calibration in commonly 3 -
15kg/cm 3 。
When the product surface has a little gas, mixed color, shrink and product size, weight, change is big, can be appropriately increase the back pressure.
When the nozzle leakage on glue, salivate, molten material overheating decomposition, product color and back slowly to consider appropriate to reduce back pressure.
By injection molding machine factory and your interpretation of the injection molding machine back pressure have let you have a certain knowledge of back pressure?
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