Can poor mold design cause flash or uneven edges?

Yes. Flash and uneven edges are among the most direct manifestations of tooling deficiencies. Insufficient flatness or wear on the parting surface leaves a gap that the compound is forced into under injection pressure, producing thin-edge flash. Poorly placed or undersized vent channels allow compressed air to redirect material flow toward low-resistance areas, causing localized overflow. Insufficient clamp force — particularly with low-viscosity compounds or at higher injection pressures — allows the mold to open slightly under pressure, producing flash even when the parting surface is in good condition. Gate design also affects edge quality: an incorrectly positioned or undersized gate produces uneven fill patterns that leave short-shot marks or weld lines at the edges. Ruixiang’s tooling team designs molds to the specific cross-section and compound characteristics of each product, and provides mold trial and adjustment cycles until dimensional targets are met.

For product specifications, technical data sheets, or sample requests, contact the Ruixiang team: olivia@dgruixiang.com  |  www.medicalsiliconetube.com