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Splay in Injection Molding

Splay shows up as silver streaks, usually fanning out from the gate. The surface looks wet even when the part is dry in your hand.

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Splay, or silver streaks, on an injection-molded part: moisture, shear, and what to check at the press.

Splay shows up as silver streaks, usually fanning out from the gate. The surface looks wet even when the part is dry in your hand.

Moisture or shear

Two causes cover most of what the floor sees. Moisture in the resin turns to steam in the barrel and streaks the surface. A dryer skipped after a mold change, or a gaylord left open, will do this. Shear is the other cause: the melt tears through a small gate and the streaks follow the flow. If the streaks start after a material change and the dryer alarm was ignored, dry the resin before you chase temperatures. If the same mold splayed last time and the material was dry, look at injection speed and the gate before you blame the lot.

Raising melt temperature to flow it out can make moisture splay worse. Slowing the fill can hide shear splay and then leave a short shot. If the setup tech pulled an old sheet off the shared drive, the streaks may be from last year’s process. Splay on the first shots after a changeover is often wet material or the wrong sheet. That is a setup record. The service page is injection molding software.

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