Introduction And Prevention Of Streamline And Knitting Line In Injection Molding Of Auto Parts Mould

What is Auto Parts Mould's Injection Molding Streamline and Knitting Thread

Streamlines are defects that appear as wavy patterns of slightly different colors on the surface of a plastic part. They can also be implemented as a ring pattern near the die entry point. A bond line, on the other hand, usually appears as a line where two streams intersect. While in some cases these defects may just be an unsightly mark, if severe enough, they can threaten the mechanical reliability and structure of the part. Both of these defects are caused by many of the same reasons, such as fluctuations in cooling rates or the fact that plastic materials are kept at different temperatures.

Prevents flow lines and braided lines during injection molding

Time and temperature are important influencing factors when it comes to flow and bonding defects. Here are some ways manufacturers can avoid quality problems during injection molding:

Insufficient injection/packing pressure: If the injection and packing pressures are not sufficient to force the plastic against the mold surface, lines will appear along the direction of melt flow.

Incorrect residence time: If the plastic stays in the barrel for too short a time, it cannot be effectively compacted during the hold, leaving lines in the flow direction.

Improper cycle time: The cycle time is too short to adequately heat the barrel, and the melt temperature is still too low. This creates a further problem of compacting the material into the mold.

Low barrel/nozzle temperature: Melt temperature is a critical factor in the injection molding process, if the barrel and nozzle temperatures are too low, the material temperature will drop rapidly, resulting in part defects.

Operator attention to detail is also important to avoid costly defects, which is why you should make sure you work with the right supplier.