Reasons and solutions for gate residue in injection molded parts

Problem 1: The slope of the gate is too small

Solution: The slope of the nozzle entrance gate should be as high as 80-90° on a flat surface. Due to shape restrictions, the slope of the glue inlet on arcs and inclined surfaces can be smaller, generally not less than 60°.

Problem 2: The inlet gate is too large

Solution: The gate should be as small as possible while ensuring normal filling. Try not to exceed 0.20. An overly large gate can easily lead to surface drawing residue. The maximum size of the thin gate gate should not exceed 0.20.

Problem 3: Poor gate polishing

Solution: The inside of the gate needs to be polished with 600# sandpaper or above to prevent the mold from sticking and raising the nozzle.

Problem 4: The gate processing is not in place

Solution: The size of the inlet gate needs to be inspected after EDM is completed to prevent copper work loss and insufficient processing.

Problem 5: The gate is difficult to trim

Solution: When the product uses side inlet glue, the inlet gate area needs to be flattened, which is generally 3-5mm longer than the gate, which facilitates manual trimming of the flat nozzle. Avoid adding glue to the edges of arcs and curved surfaces, which is not conducive to gate trimming.

Problem 6: There is no space in the gate area

Solution: A small gap needs to be made at the gate of side-entry and bottom-pour products. The depth of the gap is 0.5 and the length is generally 3-5mm longer than the gate to prevent the residue after trimming the sprue from affecting the half-match.

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