FAKUMA 2011: WACKER Features Liquid Silicon Rubber for Food Dosing Valves
At the 2011 FAKUMA international tradeshow for plastics processing, WACKER, the Munich-based chemical Group, will showcase the ELASTOSIL® LR 3066 product range among other products. This food-grade liquid silicone rubber exhibits extremely low-friction-coefficient surface properties. Moreover, the product offers another special feature. Adjoined silicone surfaces or slits do not heal even when post-curing without the use of release agents. Thus, the liquid silicone rubber facilitates and enhances the production of food-industry dosing valves. FAKUMA 2011 takes place in Friedrichshafen, Germany, from October 18 to 22.
The ELASTOSIL® LR 3066 line’s special properties are the result of a new formulation concept that prevents neighboring silicone surfaces from reacting with each other irreversibly during subsequent heat treatment. In addition to friction reduction, this effect has a particularly positive impact on the manufacture of silicone moldings with specified slit-shaped openings. For example, dosing-valve slits made of ELASTOSIL® LR 3066 do not heal during post-curing.
In contrast to conventional standard silicones, such valve slits can be produced prior to post-curing without the use of additives to separate the slit edges. This simplifies the manufacturing process and helps prevent the additive-related risk of contamination. The non-healing effect is ideally exemplified by the production of dosing valves for ketchup or mayonnaise bottles.
Furthermore, the formulation concept imparts the cured rubber with an intrinsically smooth surface, as is already widely known for other silicone products of the ELASTOSIL® LR 3065 line for technical applications. Compared to standard silicones, the 50 to 70 percent lower friction coefficient can be an advantage during assembly of the components since friction can hinder silicone-part installation. Lower friction also facilitates release after injection molding.
The ELASTOSIL® LR 3066 product range comprises three types that cure to the hardnesses of 40, 60 and 80 Shore A. These three liquid silicone rubber types are transparent and can be pigmented in any color. Ther cured rubber complies with the food standards of the Federal German Institute for Risk Assessment (BfR), the French Arrêté du 25 novembre 1992 and the US Food and Drug Administration (FDA).
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