Injection molded parts crack during ejection, or are easily broken or cracked during processing. How to solve the problem? The root causes and suggested remedial measures are summarized below from multiple aspects.
1.Plastic machine
A. The melt temperature is too low. Warm up the rear area and injection nozzle on the injection cylinder. Reduce the extruder screw speed or turn it faster to get a reasonable bolt surface speed.
B. The plastic dissolves in the injection cylinder, causing the plastic molecules to crack. Lower the temperature of the injection cylinder in any area. Reduce back pressure. The injection cylinder using the exhaust pipe ensures that the exhaust holes are functioning properly and that each hole is set to the correct temperature.
C. The mold filling speed is very slow. Increase mold temperature. Cushion material for balancing on injection molding machines.
2.Mold
A. The surface of the mold is too cold. Increase mold temperature. Limits the rate at which the cooling fluid passes through the mold.
B. The gate and the glue inlet are too small, resulting in excessive shear rate during mold filling. Use full-circle flow channels and increase the specifications of the flow channels and glue inlets to facilitate reliable operation during the mold filling process. Accepted crop ratio.
3.Plastic
A. The working pressure of the injection molded parts is not properly released or not resolved. Quench the injection molded part, if it is a polyester plastic product, immerse it in warm water.
B. Injection molded parts are not fully suitable for special plastics. If possible, redesign the product to improve the missing cross-section.
C. Too much recycled material is added. Reduce the amount of recycled material mixed with new plastic.
D. Orc plastic residue. Check the plastic for residue. Completely clean the injection cylinder. Remove the silo or feeder and clean it completely.
E. The quality of recycled materials is likely to be weak. Separate the regrind and look carefully for signs of residue. Make sure the fumes are removed from the recycle material. Check that recycling procedures are strictly followed.