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Short Shot Injection Molding

A short shot means the mold did not fill. The part is missing a corner, a rib, or the end of a flow path.

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A short shot means the mold did not fill. Common causes at the press, and what to check before the next cycle.

A short shot means the mold did not fill. The part is missing a corner, a rib, or the end of a flow path.

Why the cavity did not fill

The machine ran out of stroke or pressure before the flow front finished. Typical reasons: the shot size was cut back, the cushion disappeared, the melt is too cold, injection speed is too low, or a vent is plugged so the front stalls. A cold slug after a long pause will short the first shot and then clear. After a mold change, check that a slide is not staying in the way. A short that is always in the same place is geometry or a vent. A short that moves is more often material, temperature, or a marginal shot size.

Adding pack pressure to fill a short often flashes the parting line. Get a full fill on injection, with a small cushion, before you use pack to densify the part. If the sheet says the mold filled last month at a lower pressure, compare the sheet revision before you rewrite the process. Short shots after a changeover are often the wrong sheet or a shot size left from the previous mold. Tracking which mold is on the press is mold setup tracking. The broader system is on the injection molding software page.

Live products: SetupLens, EduMatrix Pro, ImanQuest.

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