Liquid silicone injection molding secondary encapsulation method

liquid silicone rubber injection molding

Liquid Silicone Rubber (LSR) injection molding is a widely used method for producing precision silicone components. Secondary encapsulation refers to the additional processes performed on LSR-molded parts to provide extra functionalities or protection. Here is an overview of secondary encapsulation methods used in conjunction with liquid silicone injection molding:


  1. Overmolding:
    • Process: Overmolding involves molding a second material over an LSR-molded part.
    • Applications: Enhances grip, adds color, or provides a protective layer.
    • Materials: Various thermoplastics can be used for overmolding.
    • liquid silicone rubber injection molding

      liquid silicone rubber injection molding

  2. Insert Molding:
    • Process: Insert molding involves placing inserts (such as metal or plastic components) into the mold before injecting LSR.
    • Applications: Creates a strong bond between LSR and insert for enhanced structural integrity.
    • Materials: Inserts can be made from a variety of materials.
    • liquid silicone rubber molding process

      Liquid Silicone Rubber (LSR) molding is a highly versatile and precise manufacturing process known for its ability to produce intricate silicone components with exceptional quality.

  3. Two-Shot Molding:
    • Process: Two-shot molding, or multi-shot molding, enables the production of a part with different materials or colors in one molding cycle.
    • Applications: Provides versatility in design and functionality.
    • Materials: Different LSR formulations or other compatible materials.
  4. Co-Molding:
    • Process: Co-molding involves molding two different materials simultaneously or sequentially.
    • Applications: Combines the properties of different materials for improved performance.
    • Materials: Can include LSR with other materials like thermoplastics.
  5. Silicone Coating:
    • Process: Applying a silicone coating over an LSR-molded part.
    • Applications: Provides a protective layer, enhances aesthetics, or imparts specific properties.
    • Materials: Liquid silicone for coating.
  6. Vulcanization or Curing:
    • Process: A secondary curing process after the initial LSR molding.
    • Applications: Enhances mechanical properties, improves heat resistance, or modifies hardness.
    • Materials: Same or compatible LSR formulation.
  7. Printing or Marking:
    • Process: Adding information or graphics on the LSR surface using printing or marking methods.
    • Applications: Branding, labeling, or adding information.
    • Materials: Printing inks or marking materials compatible with LSR.

The choice of secondary encapsulation method depends on the specific requirements of the application, such as desired properties, aesthetics, and functionality. Manufacturers often use these methods to tailor LSR-molded parts to meet the diverse needs of various industries, including healthcare, automotive, and electronics.