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Technology Hot runners clear the way for transparent part production

Editor: Eric Culp

High demands on processing clear thermoplastics can leave toolmakers searching for solutions. One hot runner supplier says its systems can help.

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Rising demands on automobile headlights have given mould makers even more specifications for their products.
Rising demands on automobile headlights have given mould makers even more specifications for their products.
(Source: HRS Flow)

HRSFlow has announced the introduction of a line of hot runners for polycarbonate applications that demand high aesthetic quality, such as front headlamps and large injection-compression transparent surfaces for the plastic glazing market. According to the supplier, the Diamond Lux hot runner system is suitable for any type of moulding of front headlamp components for the automotive industry, including housings, bezels and, especially, polycarbonate and polycarbonate high-heat moulded lenses.

Glass replacement spurs demand for systems

The supplier said the line also suits the plastics glazing sector. Here, quarter windows and panorama roofs – formerly manufactured in silica glass – are now being moulded in polycarbonate by using multishot technology, which allows for the integration of locating and mounting features.

See: Milacron to buy Mold-Masters

Improving thermal properties of system proves key

The line features hot runner thermal optimisation, which focuses on insulating the mould plates using spacers with low thermal conductivity and paying particular attention to power loss in the thermal bridges. All contacts toward the mould have been geometrically optimised to reduce thermal power dissipation and are made of materials with low thermal conductivity, the company said. It noted that heaters are symmetrically positioned at the top and bottom of the manifolds to reduce cold zones and high residence time. The screwed-in nozzles do not allow for any contact with the mould except for at the tip area.

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