What are the Principals of Heat Sealing for my Hot Air Machines?

Heat sealing is the correct combination of heat applied by a wedge, speed, and pressure will allow you to achieve a properly welded seam.

Heat

The heat required for the welding operation is created electrically by two heating elements located inside the heat element housing. The hot air temperature ranges from 100 to 1350 Degrees Fahrenheit or 25 to 730 Degrees Celsius.The best way to find the required temperature, Miller Weldmaster suggests testing samples.  

Note: Be sure to clean off the wedge regularly to ensure complete and even heat across the entire wedge.

Speed

The Speed of the Weld Rollers determines the time the heat is applied to the material being welded. The slower the speed setting, the more the material will be heated. The faster the speed setting, the less the material will be heated. To achieve the best weld, a minimal amount of heat should be applied to the material while still achieving a full weld. Too much heat will cause distortion of the material; while not enough heat will prevent the material from welding.  Desired speed may vary based on the material and application.  

Pressure

The pressure applied by the welding roller is the final step when creating a weld. The pressure of the weld roller compresses the heated material together completing the welding process.

Note: Having clean weld rollers ensures that the seam will be smooth.  Dirty or worn-out rollers may cause wrinkly or bad seams.  

Precision

The welding head has precise positioning of the welding head exactly where it is needed.  Depending on your machine, there is either a motor that moves the head or you can manually adjust the position of the heating element that