Retrofit processing unit specially designed to process LSR

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  • Retrofit for standard injection molding machines
  • All Components for mixing and metering of LSR (Liquid Thermoset Rubber)
  • Resistance to corrosion or wear

Nordson Corporation has developed a complete injection-unit package for liquid silicone rubber (LSR) molding that meets the special mixing and metering requirements of low-viscosity thermoset ingredients and can be readily retrofitted on standard injection molding machines.

Complete package: from screw to seal

The Xaloy LSR Package includes a specially designed screw, barrel, seal, valve, and nozzle, along with other components where needed, such as a feed-pipe adapter. Nordson recommends the package for manufacturers of seals, gaskets, cushioning pads, medical devices, infant feeding items, ruggedized electronic devices, and such kitchenware as baking pans and spatulas.

“The low-viscosity liquid ingredients for LSR pose a very different set of mixing and metering requirements from those of thermoplastics, and their temperatures must be maintained below the curing point until homogenized material reaches the mold cavity,” said Mr. Colella, global product manager for the Xaloy brand.

Processing unit for LSR

The components of the Xaloy LSR Package are:

  • Screw: A single-flight, wear-resistant, 12:1 to 14:1 L/D screw is designed to provide optimum homogenization of catalyst and crosslinking agents without increasing the temperature of the compound.
  • Barrel: With a feed port moved downstream and two welded cooling jackets, the barrel is designed for a low L/D ratio and provides the intensive cooling required to hold the LSR compound below crosslinking temperature. The Xaloy X-800 barrel inlay is a nickel-based alloy with tungsten carbide, providing the abrasion and corrosion resistance posed by certain LSR compounds.
  • Rear seal: This is installed on the barrel or as a seal ring on the screw shank.
  • Valve: An Xaloy spring-loaded valve ensures immediate shutoff with low-viscosity LSR compounds.
  • Shutoff nozzle: This component is provided by a partner company that is a longtime supplier to the LSR industry.

The company will introduce the package at Chinaplas 2016.

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