Selecting a Hot Melt System
Selecting a Hot Melt System
THERMADOSE® hot melt tank controllers are selected by determining the tank capacity required, melt rate and the pump rate necessary to provide sufficient material for the process. Another factor that also influences the decision is whether the application is a manual process or an automated system.
When a hot melt tank controller is coupled to a hand valve, the tank controller becomes part of a manual system. When connected to an automated valve it can be an integral part of an automated production system.
Each hot melt tank controller includes a heated melt tank with easily replaceable cartridge heaters. Tanks are coated with Teflon®. The tank controller is all electric and does not require compressed air. The wide mouth design of the self-sealing tank lid will accommodate a large selection of solid adhesive forms.
Heated hoses are both electrically and mechanically attached to the unit via easy-access connectors on the rear panel of the controller.
A fluid pressure regulator valve provides fluid pressure control via a bypass mechanism. Motor speed is also adjustable for additional flow control.
5 Steps to Select a Hot Melt System
1) Selecting a Tank Controller for an Automated System
Hot melt tank controllers are most popular for low to medium-volume production. The model HM110, 11kg unit, is suitable for automated assembly lines and robots. Note that the model HM044, 4.4 kg unit, is a convenient and economical system for low volume manual hand valve or bench assembly operations only.
2) Selecting a Tank Controller for a Manual System
Select the appropriate tank capacity controller. All systems are suitable for manual dispensing.
3) Selecting a Heavy-Duty Braided Heated Hose
Select a hose diameter suitable for the viscosity and flow rate. Hose diameters are coded. The recommended hose code is 6, which is 3/8” (9.52mm) The maximum hose length possible varies per system, but a 220/240V hose can be as long as 32 ft (9.67m). A hose over 16ft (4.87m) requires a 220/240V unit. Hoses are Teflon® - stainless steel braided. Note that hoses for automated systems using an automatic valve are supplied with bayonet electrical connections and hoses for use with manual hand valves include screw-on electrical fittings. (ref page 7 for Steps in Selecting a Heated Hose).
WARNING: Always allow extra length for routing around corners, a minimum of 16" (406mm) dia. per bend.
4) Selecting a Hand Valve for a Manual System or an Automatic Valve for Bench Mounting
Automatic valves can be mounted on a bench as a fixed work station and triggered by a foot switch. Hand valves with trigger action are an ergonomic method of free-hand dispensing. Nozzles are selected for beads, spray or swirl.
5) Selecting an Automatic Valve for an Automated System
The automatic valve set used with a robot is usually a single head type fitted with a nozzle for dispensing shots or beads. Swirl pattern nozzles and spray heads are employed to cover wider areas or coat surfaces.