Large plastic box mould is not well formed

- Jul 18, 2018 -

Large plastic box mould is not well formed

burrs

Cause analysis,

1. Insufficient clamping force: when the clamping force is insufficient, the template may be supported by high pressure in the hole, and the glue will overflow, resulting in rough edges.

2. Excessive plastic metering: too much plastic metering, too much molten glue is squeezed into the die hole, the template may be supported by the high pressure in the die hole, and the molten glue overflows, resulting in rough edges;

3. The material pipe temperature is too high: the material pipe temperature is too high, and the melt glue is too thin, which is easy to infiltrate into the clearance of all parts of the die hole and generate rough edges;

4. High radiation pressure;

5. The firing speed is too high or too low;

6. The pressure is too high;

7. The retention time is too long or too short: if the plastic stays in the material tube or/or the heat flow channel for too long, the plastic will become thinner, and the glue will easily infiltrate into the clearance of the die hole, resulting in rough edges. The retention time is too short, the melt temperature is too low, and the glue is too thick. The mould can only be filled with high pressure.

8. Mold wear.

The solution

1. Confirm whether the locking force is sufficient;

2. Confirm whether the measurement position is correct;

3. Reduce the resin temperature and mold temperature;

4. Check whether the injection pressure is appropriate;

5. Adjust the shooting speed;

6. Change pressure protection pressure or change position;

7. Maintenance of molds.