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LIM takes the initials of Liquid Injection Molding. This molding method consists of mixing a number of liquid raw materials (generally two liquids) in a fixed ratio, and injecting the mixture into a high temperature metal mold, which is then hardened by heating.
Although the materials were previously limited to silicone rubbers with hardening times that were capable of supporting the speed of the injection molding, recently the lineup has grown to also include materials other than silicone rubbers.

In general, the LIM system has the following four advantages.
① Shortening of processes
Because liquid silicone rubber is hardened using an addition reaction, the speed of hardening is fast, allowing shorter molding time.

② Increase of productivity
Because the materials are liquids, molding is possible at low injection pressures, allowing support also for the molding of detailed components.
  Precise mixing of the two liquids A/B and the low possibility of foreign substances to be mixed in realize high quality and highly efficient molding.

③ Automation of molding
The molding process can be automated as the system can support burr-free and runnerless molding, and because the releasability after hardening is also outstanding. Continuous automatic molding with short cycle times will also be possible.

④ Low burden on the environment
Because there are no by-products due to the hardening reaction, and since the burr-free and runnerless molding does not require waste material processing, environmentally friendly manufacturing is possible.

Fujikura Rubber’s LIM

The introduction of our LIM systems started with the production of packing for medical applications in 1983. In the 1990s, this was further developed to rubber components for home appliances, including laundry machine components and packing for remote controls inside bathrooms. From 2000, we began production using new materials other than silicone rubbers, such as liquid fluororubber (SUPER FUJIKURAFLEX (SF)). These materials are mainly applied to rubber components of automotive fuel valves and drive system (automatic transmission) valves.

Our production lines are administered inside clean rooms (some inside quasi-clean rooms), so that we maintain an environment for supplying products satisfying the requirements for various applications, from medical components to general industrial material rubber components.