Overcoming Splay Challenges

Custom Xaloy? Screw Design Drops Injection Molding Scrap Rate by 75%

Splay is one of the most common defects in injection molded products. It is a troublesome cosmetic defect which appears as silver or white streaks on the surface of the molded part. Excessive heat, moisture, and shear are common causes of splay.

Typical solutions to reduce splay include temperature reduction, lowering speed and/or back pressure and drying the resin. If these fail, the screw design should be examined.

This was the case for one of our injection molding customers. Xaloy provided a custom screw design that optimized their production process with improved results, as their scrap rate was reduced by 75%.

THE CHALLENGE

An injection molding manufacturer in western Europe producing industrial products was challenged with splay appearing in their product, resulting in an undesirable 20% scrap rate. They were processing gray rigid polyvinyl chloride (RPVC) with an 80mm 24:1 general purpose screw with a thread-on smear tip in a Demag injection molding machine. After failed attempts with multiple screws, they turned to Xaloy? for a solution that would solve their splay issues and decrease scrap rate.

Luckily, Xaloy had the right solution for them. [click to continue reading...]