The mounting technique is essential for safety, performance, and functional life of the heater. Here are the most frequently used methods, starting from most common:
1. High-Temperature Hook and Loop (Velcro)
A flexible and convenient solution, and particularly useful for smaller hoppers or when the blanket needs to be taken on and off several times.
How it works: Strips of high-temperature rated hook and loop are sewn or adhered to the silicone blanket. The corresponding strip is either adhered to the wall of the hopper (with a high-strength adhesive) or mounted on the opposite ends of the blanket to allow it to wrap and fasten to itself.
Pros:
Easy Installation/Removal: Great option for applications that require frequent on-off cycles of the blanket.
Good Conformity: Adjusts well to shapes of the hopper.
Cons:
Temperature Limit: The hook and loop material must be rated for the maximum operating temperature of the heater (can be rated at 500°F / 260°C for most top quality types).
Adhesive Strength: If using adhesive backed strips on the hopper, the surface must be clean even for the adhesive to take properly.
Not secure: Not suitable for high-vibration environments.
2. High Temperature Adhesives
Used as a primary technique for small blankets, or as a supplement with the intention of improving heat transfer.
How it works: A high temperature silicone based adhesive is applied between the heater and the hopper surface. Some heater manufacturers build a pressure sensitive adhesive (PSA) into their heaters, protected with a peel-away liner.
Pros:
Excellent Thermal Contact: It eliminates air, providing maximum efficiency heat transfer.
Permanent Mount: It's a physically very secure, and clean looking alternative to other mounting techniques.
Cons:
Permanent: It will make removal later difficult, and will usually ruin the heater.
Surface Prep: The surface of the hopper must be completely clean and free of oxidation ('rust'), oil, grease, and dirt/stevil, to ensure it bonds appropriately.
Curing Time: Some (not PSA) adhesives will require a timely cure time.
