Norck: Your Partner for Precision Liquid Silicone Rubber (LSR) Molding
Norck delivers high-quality LSR molded components, empowering engineers, designers, and manufacturers across medical, automotive, consumer goods, electronics, and other sectors to harness the unique properties of silicone.
Norck is certified with the ISO 9001:2015 quality management system, showcasing its dedication to excellence. Key aspects include:
This certification reflects Norck’s ongoing commitment to quality and performance.
Click here to view Norck's ISO certification.
It is a rubber molding process that injects rubber into a mold to form the desired shapes. Mold is made from hardened steel and contains the body of the part to be molded. The liquid silicone rubber molding process is used for high and medium-volume production.
Liquid silicone rubber molding offers many advantages:
• Flexible parts: Since the material is silicone.
• Flexible design: The design rules are not as strict as injection molding of thermoplastics.
• No sink marks: Even when there are different thicknesses, silicone parts will not present sink marks.
• Undercuts are acceptable to a degree: Due to the material's flexibility, undercuts are acceptable.
• Resistant against chemicals
• Costs less than injection molding
But there are some disadvantages as well:
- Complex tooling: Two barrels, a static mixer, etc., makes the tooling more complex.
- Longer cycle time: LSR would take more time to finish a cycle
- Less accurate tolerances: Due to the material's flexibility, the silicone parts don't have accurate dimensions as a thermoplastic injection molding part.
Like in injection molding, Liquid Silicone Rubber is injected into a mold to form the desired shape, but with minor differences:
1. Mixing materials: The injected material is composed of two substances, which get mixed in a mixing chamber before being injected. The liquid silicone rubber runs cool to prevent the rubber from curing. While the liquid injection molding requires a low pressure (<1000PSI), the required pressure for LSR is between 1450 to 14500 PSI.
2. Injection: The mold is closed, and the screw will advance to increase pressure in the injection chamber and inject the mixed liquid silicone into the mold. The clamped cavities are heated to cure the liquid silicone and are maintained close until the solution solidifies.
3. Heating: After injection, the silicone will be heated to become solid.
4. Ejection: The Die is opened, and the part is ejected manually or automatically.
Obtaining a fully functional part might require extra processing for features that can't be made with the Injection molding process, such as taping. The designed part should follow injection molding design guidelines.
Norck is a technology-powered manufacturing leader specializing in CNC machining, 3D printing, sheet metal fabrication, and injection molding. Our intelligent, data-driven approach ensures exceptional quality, optimized costs, and seamless supply chain management for companies worldwide.
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