Incoe's Heat-Inject System: Eliminating Weld Lines for Molded Parts at K 2025

For perfect surfaces Invisible weld lines: Incoe presents Heat-Inject at K 2025

2025-10-02 Source: Incoe 1 min Reading Time

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At K 2025, Incoe will showcase how its compact Heat-Inject system makes weld lines on moulded parts virtually disappear. Using localized variothermal temperature control, the technology delivers precise heat pulses that eliminate surface defects — with minimal energy input and without disturbing the overall molding process.

Variothermal temperature control to the point: Heated stamps prevent visible weld lines on the molded part through heat pulses.(Source: Incoe) — Variothermal temperature control to the point: Heated stamps prevent visible weld lines on the molded part through heat pulses.
(Source: Incoe)

It is not possible to avoid weld lines altogether, as they occur naturally due to the flow of the melt in the cavity. However, it is possible to ensure that they are no longer visible on the surface of the moulded part. Hot runner manufacturer Incoe will be demonstrating this at its booth at K 2025 manufacturing salad servers from SMMA. Behind the openings in the molded part, where the weld lines form due to the melt flows merging there, the Heat-Inject localized variothermal temperature control system applies timed heat pulses that prevent the weld lines from becoming visible on the surface.

The product concept of Heat-Inject is simple, robust, and requires very little energy. A heated stamp is briefly pressed against the wall of the cavity from behind and transfers a small amount of heat. This amount of heat is sufficient to briefly raise the temperature of the mould surface to a level that prevents the formation of a weld line notch. At the same time, the amount of heat introduced is so small that it is quickly dissipated via the mold plate without disturbing the heat balance in the mould or the injection molding process. Heat-Inject units are supplied mounted on the hot runner system. However, they are also available in modules as an extra assembly.

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