1. Phenomenon:
Plastic mold company pointed out that the molten resin into the mold part of the split surface and the type of joint surface forming a gap after the occurrence of flash.
Possible reasons:
Injection molding machine
1. The clamping force is insufficient
Plastic mold company pointed out that the clamping force is insufficient, the template may be mold cavity within the high pressure distraction, melt overflow, resulting in burr.
2. Plastic metering too much
Plastic metering too much, too much of the melt was squeezed into the mold cavity, the template may be mold cavity within the high pressure distraction, melt overflow, resulting in burr.
3. The tube temperature is too high or too low.
Material tube temperature is too high, too thin melt, easy to penetrate the cavity around the hole, resulting in flash.
High pressure
5. The fire rate is too high or too low.
6. Holding pressure is too large.
7. Stay too long or too short.
Plastic in the pipe or / and hot runner in the residence time is too long, will make the plastic thinning, melt easy to penetrate the cavity around the gap, resulting in burr. Plastic mold company pointed out that the residence time is too short, the melt temperature is too low, the melt is too thick, to be high pressure to fill the mold, the template may be distraction, melt spill, resulting in burr.
3. Solution:
1. Check if the clamping force is sufficient.
2. Verify that the measurement location is correct.
3. Reduce the resin temperature and mold temperature.
4. Check that the injection pressure is appropriate.
5. Adjust the firing rate.
6. Change the packing pressure or change the position.