- Removal or Positioning of Weld Lines
For large plastic products such as electrical shells, and automobile door panels with strict shape requirements, there should be at least two or more filling gates to fill the product for a set hot runner system mould. For common hot runner system, the gates are filled at the same time during injection.
If the product needs to change the weld line position, can only be changed the melt flow rate through the temperature difference from hot runner temperature controller. Process debugging is complicated and tedious, and it is difficult to ensure stable product quality and bring passive production efficiency.
But with a sequence timer controller, only need to adjust the gate opening time & closing time, to change the melt flow position and achieve the weld line position displacement. Although it also takes time to debug, it can ensure long-term stable production without defects caused by the temperature differences of the hot runner gate.
2. Regulation of the Injection Quantity by Gate Operation
Short shots, flash, burn marks could be improved by the regulation of the Injection Quantity from each individual gate.
For the hot runner system with more than two drops, when defects such as flash, short cavity, burn marks in the injection molding processing. Usually to adjust the defects through multi-stage injection’s pressure speed. Moreover, sometimes it is difficult to debug and can only be solved by mold repair. Using the sequence timer controller, product defects can be improved by changing the opening time and closing time of individual valve gates.
3. Reduction of Clamping Force
Injection is performed with minimum clamping force because all of the gates are not opened simultaneously.
4. Reduction of Flow Marks
Flow marks are minimised by being able to raise the injection rate of the gate.