Components manufactured using a combination of materials or substrates has become an attractive option and is being used by a variety of industries for applications ranging from sealed connectors in automotive, spray formers in shower heads, and pump housings in medical devices. Multi-material components offer the unique benefit of exhibiting the characteristics of the individual materials, as well as their advantages. In addition to producing a multi-functional component, the process of combining various materials/substrates in a single molding process also offers the OEM benefits such as reduced assembly costs, and superior sealing for improved quality. Design capabilities are also enhanced allowing for complex part geometries and the use of non-plastic substrates.
For Two Shot Molding, a multi-shot mold is needed. There are several types of multi-shot molding available, such as over-molds, core-back, and multi-station molds. The right mold selection depends on part geometry, volume, quality, and molder capacity/capability.
In 2-Shot injection molding, a polymer is injected over a molded plastic insert to combine the best features of different materials while reducing or eliminating additional assembly operations. This reduction or elimination of post-processing steps is one of the biggest economical advantages of the 2-Shot silicone injection moulding process. For this kind of silicone injection moulding, a multi-shot mold is needed. There are several types of multi-shot silicone injection moulding available, such as over-molds, core-back, and multi-station molds. The right mold selection depends on part geometry, volume, quality, and molder capacity/capability.
Plastics are either organic or semi-organic materials that have (as their main attribute) a very large molecular weight. These very large molecules, or macromolecules, give them their distinct properties and material behavior, when compared to other materials used in manufacturing or found in nature.
Injection molding of Liquid Silicone Rubber (LSR) has existed and evolved over the past 20 years. Due to the thermosetting nature of the material, injection molding of liquid silicone rubber requires special treatment, such as uniform distributive mixing; in addition, the material must be maintained at a constant temperature up until it is pushed into the heated cavity and vulcanized.