What is a Silicon Molded Screen in a Vibro Sifter?
A Silicon Molded Screen (also called a Silicone Bonded Screen) is a GMP-compliant, hygienic type of sifter screen where the sieve mesh is permanently bonded to the stainless steel frame using food-grade silicone instead of rivets, bolts, or glue.
In this design, a silicone gasket or molding seals the joint between the SS mesh and the screen ring, ensuring a smooth, leak-proof, and contamination-free surface.
πΉ Construction Details
- Frame Material: SS304 or SS316 (as per GMP standard).
- Mesh Material: Stainless steel wire mesh (as per micron requirement).
- Bonding Material: Food-grade, non-reactive silicone (FDA-approved).
- Molding: Silicone is poured or molded along the inner periphery to tightly bond the mesh with the frame.
πΉ Key Features
- Seamless and Hygienic Joint:
- The silicone bonding eliminates gaps, crevices, or exposed edges β preventing material entrapment.
- No Welds, Rivets, or Bolts:
- Ensures a smooth, joint-free surface, ideal for pharmaceutical and food industries.
- Leak-Proof and Airtight Seal:
- The silicone layer acts as a gasket, preventing powder leakage and cross-contamination.
- Good Flexibility and Cushioning:
- The silicone absorbs vibration and shock, extending screen life.
πΉ Disadvantages
- Higher cost compared to clamped or bolted screens.
- Mesh replacement not possible β entire screen must be replaced once damaged.
- Not suitable for high-temperature processes (as silicone has limited heat tolerance).
πΉ Typical Applications
- Pharmaceutical powder sieving (GMP models)
- Food and nutraceutical industries
- High-purity or contamination-sensitive applications
