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Knarr Increase efficiency with stack moulds

Editor: Steffen Donath

Double the output volume while using the same tool and machine size? To ensure that this idea does not remain an illusion, some injection moulders rely on stack moulds.

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Rack- and spiral gears for stack moulds.
Rack- and spiral gears for stack moulds.
(Source: Knarr)

In contrast to classic injection moulds, two or more parting lines are parallel one behind the other. This arrangement is one of the most important arguments for stack moulds: an optimal utilisation of the closing force of the machine is achieved.

Doubling the cavities also means doubling the parts production. The proportionately calculated hourly machine rate spreads over a significantly higher production volume. That results in significantly lower unit costs and an enormous increase in productivity.

In the classic design, a stack mould consists of a central middle part and two ejector sides. Knarr now offers two different drive mechanisms for synchronous lifting movements on both sides. Both alternatives can be flexibly adapted to the desired length according to your requirements.

Rack gear

The classic rack gear that can be quickly and easily mounted on the tool as it delivered as a pre-assembled unit. Depending on the mould size, two or four of these drives are installed on the tool. A closed housing offers additional stability. The well-known, but optimised design offers more than 30 % space savings compared to similar drives, Knarr explained.

Spiral gear

The innovative solution when it comes to stack moulds. A special spindle geometry enables significantly higher load transfers. At the same time, minimum space is required on the tool due to an even more compact design. The use of handling robots or an additional injection unit is therefore not a problem. Thus, the spiral gear is not only a worthwhile option for high-speed moulds, the company promises.

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