Tablet PC Hardware Punching Die

Tablet PC Hardware Punching DieUtilization of back pressure in the injection molding process In the injection molding process, it is often difficult to solve the shrinkage of a certain part of the pr

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  • 型号: Tablet PC Hardware Punching Die

Tablet PC Hardware Punching Die


Tablet PC Hardware Punching Die


Utilization of back pressure in the injection molding process






  In the injection molding process, it is often difficult to solve the shrinkage of a certain part of the product. In this case, only the use of back pressure can be used to properly adjust the back pressure parameters.




  The reason for using back pressure is: when the screw rotates, the plasticized plastic is pushed forward under the action of the screw, and reaches the front of the screw through the stop valve. Due to the forward advance of the melt, the melt produces a reaction force. Acting on the screw and the check valve to make the screw move backwards so that more melt is pushed forward. At this time, if the back pressure is adjusted, the cylinder will have a certain pressure acting on the screw from back to front, providing The resistance of the screw to retreat, the greater the back pressure, the longer the screw reset time, and the pressure generated by the melt at the front of the screw must be greater than the back pressure to make the screw retreat. It must be pointed out that not all injection molding must use back pressure, but if back pressure is used, the plastic can be fully melted and mixed evenly.




 Injection molding




  There are more advantages to using back pressure in the injection molding process: First, it is beneficial to the discharge of volatile gases in the melt. 2. To make the additive and melt mix more evenly. Third, make plastic plasticization more uniform, and so on.






How is the cloak formed in the filter injection mold?


  The most common problem we have in the filter injection mold is that the production is prone to produce cloaks. Many filter injection mold manufacturers choose post-processing. This fundamentally cannot prevent the problem from occurring. Post-processing will also affect the product. There are hidden dangers in the quality of the product, and there is no way to guarantee the quality of the product.


 滤清器注塑模具

 

The filter injection mold produces a cloak, and the reason must be found first. Because the filter injection mold pays attention to precision, it may be that the accuracy of the matching error is more than 2C, and the cloak phenomenon will appear. If it is the soft rubber in the filter injection mold, the cloak will appear as long as the error is 1C. First of all, check whether there is much space left in the matching parts or pillows. Another reason is to check the injection molding machine and whether the adjustment parameters are reasonable. 

滤清器注塑模具

The cloak phenomenon in the filter injection mold is the most troublesome and easy mistake of making the mold. The key to a good solution is to find out the cause of the mold cloak, and only when it is clear can the cloak be resolved.