Reaction injection molding
Reaction Injection Molding ( RIM ) or Reinforced Reaction Injection Molding ( RRIM ) is a primary molding process for the production of plastic molded parts. Two components (and possibly other additives) are intensively mixed in a mixer and then immediately injected into a molding tool as a reaction mass. The curing takes place in the mold. A characteristic of this process is, among other things, a low locking pressure of the molding tools. With this method, the periods of time that are required to make the mold available for a new molded part are between one minute and five minutes. RIM is preferred in the production of molded parts made of polyurethane , such as. B. for the automotive industry, use.
Molded parts from the RIM process compete with those from the injection molding process . The reaction masses from the RIM process have a more favorable flow behavior than thermoplastic melts due to their low viscosity . This means that larger flow paths can be achieved with the same wall thickness. On the other hand, there is an increased effort for sealing and metering as well as longer process times in production.
The S-RIM (Structural RIM) or MM-RIM (Mat Molding RIM) process is based on the RIM process, in which a reinforcing component is enclosed by the reaction mass.
Individual evidence
- ↑ Klaus Stoeckhert (ed.): Kunststoff-Lexikon, 7th, new revised edition; Munich, Vienna, Hanser 1981, ISBN 3-446-13088-8 , p. 436.
- ↑ a b c Hansjürgen Saechtling: Kunststoff-Taschenbuch, 24th, completely revised and expanded edition; Munich, Vienna, Hanser 1989, ISBN 3-446-15385-3 , p. 74.
- ↑ Hansjürgen Saechtling: Kunststoff-Taschenbuch, 24th, completely revised and expanded edition; Munich, Vienna, Hanser 1989, ISBN 3-446-15385-3 , p. 86.