Husky Side-gating hot runners said to produce better mouldings

Editor: Eric Culp

The advantages of this technology derive from its time- and space-saving aspects, its output of smooth, clean parts, and its ease of use, according to Husky.

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Ultra SideGate hot runners give access to the tips while the moulds remains in situ.
Ultra SideGate hot runners give access to the tips while the moulds remains in situ.
(Source: Husky)

Hot runners are one of the most important components of a moulding system. They have a dramatic impact on speed, quality and uptime, so mould makers wanting to provide a complete solution to customers will carefully consider the hot runner. Side-gate hot runners are perfectly suited for deep-drawn smaller parts that lack the flat surface required for optimal gating performance with traditional hot runners. A good example is the Ultra SideGate hot runner technology devised by Husky Injection Molding Systems.

Side-gate hot runners allow parts to be direct-gated that would usually require a cold runner. This saves resin and time by eliminating the need for additional downstream processing. Other advantages of direct-gating with a side-gate hot runner are better part quality, faster cycles, easier mould maintenance, greater flexibility in mould design, and performance across a wider temperature range.

Always a priority for moulders, part quality is especially important to medical product manufacturers, primarily because safety is such a concern. Sharp edges or pronounced gate vestiges can tear latex gloves or even skin. Hot runner design has much to do with gate quality. Different side-gate hot runners can deliver very different levels of quality here. Husky’s Ultra SideGate hot runners include some models that offer almost zero vestige (approximately 0.05 mm).

Ultra SideGate also allows for the use of a single-piece mould, which precludes the possibility of parting lines caused by misalignment of mould halves in a split-cavity design. A single-piece cavity provides better cooling, too, helping further to maximise part quality and productivity.

Time is money, and machine uptime represents revenue and profitability. Thus, ease of maintenance, scheduled or unscheduled, is very important to moulders. Whereas, with many moulds, accessing the hot runner nozzle tips for servicing requires removing the mould from the machine, Ultra SideGate hot runners give access to the tips while the moulds remains in situ.

Space can be money, too, Husky observes. The more compact the mould tooling, at a given level of production output, the more parts can be made in a certain space. Because the nozzles on side-gate hot runners are mounted on the sides of the housing rather than the end, side-gate systems have multiple nozzle tips per housing, resulting in more cavities per unit of mould footprint. In addition, some side-gate hot runners, such as Ultra SideGate, offer tip-to-tip spacing of as little as 55 mm in order to fit more cavities into a small mould base.

A final advantage of Ultra SideGate for mould makers wishing to assure customers that a new mould will be easy to integrate into their production system is that it operates just as traditional hot runners do; no new operating procedures have to be learned. Also, the Husky technology works with any temperature controllers moulders may already use for managing mould start-up and shutdown.

Husky Injection Molding Systems S.A.

Dudelange, Luxembourg

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