Multi-component injection gets boost from gating technology

Incoe Multi-component injection gets boost from gating technology

07.05.2013Editor: Eric Culp

Injection moulding with valve gate systems delivers more performance with a specially designed actuator that is part of Incoe’s Soft Gate system.

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The film opposite the valve gate is destroyed when plastic melt shoots in, a problem this technology is said to eliminate.
(Source: Incoe)

With valve gate systems, the user can become actively involved in controlling the melt in the mould cavity by deciding which injection point to open when, and for how long. This is how cascade injection moulding came about, with time-delayed opening of the individual injection points to produce very long and large moulded parts free of joint lines.

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Gallery

Direct mounting with the Soft Gate: The back moulding of film on a component just 2.5 mm thick is said to deliver top quality.

An over 2.5 m-long grille frame for an SUV, which has been painted black. Note the five gates and remaining sprues.

But this resulted in a new problem: when the nozzles opened later, the accumulated pressure discharged dramatically into the mould cavity, causing various forms of surface blemishes. A major reason for these problems with valve gate technology comes from the abrupt way in which the valve pin opens: the entire flow cross-section is released in just fractions of a second, and the pressurised melt explosively shoots from the nozzle into the mould cavity.

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