back to top
My wish lists
Save your wish list
If you want to add more content to your wish list, simply log in. If you do not have a user account, please register for the Hanser Customer Center.

» Do you already have a user account? Please log in here.
» Don't have a user account yet? Please register here.
Your wish lists
If you want to use your wish list during your next visit, simply log in. If you do not have a user account, please register for the Hanser Customer Center.
» Do you already have a user account? Please log in here.
» Don't have a user account yet? Please register here.

« Back

Your advantages at a glance

  • One login for all Hanser portals
  • Individual home page for faster access to preferred content
  • Exclusive access to selected content
  • Personal wish lists on all portals
  • Central management of your personal information and newsletter subscriptions

Register now
Deutsch
Bookmark Bookmarked
11-20-2013

New Production Concept for UV-Curing Liquid Silicone Rubber

Supports Use of Cost-Efficient Material Combinations in 2K Injection Molding

The new Elmet mold technology is designed for curing LSR with cold UV light. In the system UV-LEDs transmit light to the silicone component through a PP injection molded part (figure: Elmet)

A new production approach – first presented by Elmet GmbH, OFtering, Austria, at K 2013 – is directed at the processing of liquid silicone rubber (LSR) which cures under UV-light from a LED source. This method eliminates the high curing temperatures required for conventional heat-curing LSR grades. Hence, also thermoplastics with a low melting point, including polypropylene (PP), polyethylene (PE) or polymethyl methacrylate (PMMA), are suitable for two-component injection molding with LSR as the soft component, whereas otherwise materials providing higher temperature resistance at higher prices are required, such as polyamide (PA) or polybutylene terephthalate (PBT). Thus a broad diversity of new applications is opened up in the production of hard/soft composites using LSR as the soft component.

An application example is a soap dish made of translucent polypropylene (PP) which has a directly molded-on silicone support base. For making this item, ELMET had developed a complete production system in cooperation with the machine manufacturer Engel and the raw materials supplier Momentive.

One key element of the system is an innovative injection mold operating in a standard injection molding machine (type: e-mac170/50, manufacturer: Engel). In this mold, which has steel sealing surfaces (eliminating wear and hence, the need for replacement) on both mould halves, the molding is initially produced from UV-transparent PP. After demolding and relocating this PP part to a higher mold region, the LSR base is then injection-molded onto it. Finally, the silicone component is exposed to UV light through the PP article for curing. The light sources used in this application are rugged LED lamps which are noted for their long service life. Moreover, the activation point and ON time duration of these LEDs can be accurately matched to the curing reaction so as to minimize energy input and cycle time.

A further innovative component of this system is the new air-powered injection unit for the LSR component. Integrated into the machine control system, it provides a very precise, repeatable injection pressure and velocity for exceptional process stability. The space-saving TOP 1000 Mini metering system is another novelty; it delivers an accurately metered amount of LSR into the injection unit. The cross-linking agent and dye are introduced using a standard additives line.

Company profile

ELMET Elastomere Produktions- u Dienstleistungs-GmbH

Tulpenstraße 21
AT 4064 OFTERING
Tel.: +43 7221 74577-0
Fax: +43 7221 74577-11

These articles might be interesting for you
Patents Stimulate Innovation

Patents encourage innovation: Stay on the ball with the latest innovations in the plastics industry in our patents section.

Patents

Newsletter

Would you like to subscribe to our Newsletters on plastics technology and profit from the latest information?

Subscribe here

Subscribe here

Trade Names

You know the trade name but want to know the material manufacturer, type of polymer and delivery form? Search here!

Trade Names