HET SPUITGIETEN VAN LSR: LIQUID INJECTION MOULDING

One of Enbi Plastics’ specialties is the liquid injection moulding of silicone rubber. Liquid injection moulding (LIM) of liquid silicone rubber is a process that requires a high level of knowledge and experience because of the material and processing properties involved. Thanks to years of practical experience and close collaboration with an external training program from Dutch suppliers of toolmakers and automation companies, Enbi Plastics is a household name in the world of silicone processing.

In addition, Enbi Plastics will support you with product design, prototyping, production, and assembly of your project. Curious about how we would approach your project? Please contact one of the experts at Enbi Plastics.

WHAT IS LIM?

Liquid Injection Moulding (LIM) is a process in which two components of silicone rubber are processed into a semi-finished product or end product. Both components are fed into the liquid injection-moulding machine in a 1-to-1 ratio by a pump system. Both components are then mixed within the system of pipes, together with a colorant or other additive if desired.

This mixture is permanently cooled throughout the process, after which the desired amount of material is injected into a heated mould via a (controlled) cold-channel system. This can be a single instance, prototyping, and/or small batch sizes, or multiple instances.

In addition, it is possible to manually create a few samples with a simple test mould. The 3D printing of samples is also an option.

The versatility of LIM is a result of the material properties of LSR. Silicone can maintain a high degree of heat and flame resistance, tensile strength, flexibility, hardness, and compression set. Depending on the chemical composition, these materials can also serve as insulators or conductors. LIM makes it possible to manufacture very advanced products and components!

INCREASED PRODUCTIVITY AND MORE DESIGN OPTIONS

LIM is a fully automated process. This offers a high degree of process reliability and product quality. A typical property of LSR is the rapid vulcanization. This shortens cycle times, hightens productivity, and can result in significantly lower prices per unit compared to traditional processing techniques for HTV, also known as solid silicone rubber. Thanks to LSR’s viscous behavior and very high wall thickness, flow path ratios can be achieved. This facilitates both the production of very small and accurate precision components, as well as membrane-like products with very thin walls.

2-COMPONENT (2K) INJECTION MOULDING

LIM, based on the 2K liquid injection moulding technique, is another option that Enbi Plastics offers to its customers. 2K LIM produces multiple consecutive combinations in one cycle, by one machine. For example, connecting a plastic component to a silicone component. It is also possible to connect two silicone components (two colors and/or levels of hardness). In addition, you can choose to overmould metal parts, printed circuit boards, or other customer-specific components.

With the 2K technique, we strive to achieve a chemical bond, which is already possible for a very wide variety of types of plastic (PC-ABS, polypropylene and polyethylene are recent additions to our list). LSR-types and metals are connected chemically. Mechanical bonding will always remain an option as well.

WANT TO START USING LIM?

Please contact one of the experts at Enbi Plastics and start your LIM project today!