Liquid Silicone Rubber (LSR) Glove Dipping Process
The manufacturing of LSR-dipped gloves involves precise control of viscosity, curing temperature, and dipping techniques to ensure uniform coating and durability. Below is a detailed breakdown of the process:
1. Mold Preparation
Material: Ceramic, aluminum, or stainless steel molds shaped like hands.
Pre-treatment:
Cleaned to remove residues (using solvents or plasma treatment).
Preheated (typically 50–80°C) to improve LSR adhesion.
Optional: A release agent may be applied for easier demolding.
2. Coagulant Dip (Optional)
Used in some processes to improve LSR adhesion (similar to latex glove production).
Common coagulants: Calcium nitrate or acetic acid solutions.
Molds are dipped, then dried briefly before LSR application.
3. Liquid Silicone Rubber (LSR) Dipping
LSR Formulation:
Two-part platinum-cured LSR (base + catalyst).
Adjusted viscosity (typically 1,000–30,000 cP) for even coating.
May include additives for softness, grip, or color.
Dipping Methods:
Straight Dip: Single immersion for a uniform layer.
Double Dip: For thicker coatings (e.g., industrial gloves).
Textured Dip: Molds are rolled in LSR to create grip patterns.
4. Curing (Vulcanization)
Temperature: 100–200°C (depending on LSR formulation).
Time: 1–10 minutes (shorter for thin coatings, longer for thick ones).
Process:
Molds pass through a heated tunnel or oven.
LSR cross-links (vulcanizes) into a solid, elastic film.
5. Cooling & Stripping
Molds are cooled (room temperature or forced air).
Gloves are peeled off manually or with automated stripping machines.
6. Post-Processing (Optional)
Interior Lining: Fabric (e.g., cotton, nylon) may be added for comfort.
Surface Treatments:
Chlorination (for easier donning).
Grip enhancement (micro-texturing, anti-slip coatings).
Quality Checks:
Pinhole testing (electrical conductivity test).
Tensile strength & elongation tests.