The question is often asked “What temperature setting do I use to seal my bags?” This question is pretty straight forward but the answer to it can be effected by many variables. Setting your heat-sealing machine to the right temperature is only one factor. Other factors include how long heat is applied to the material (dwell), and how much pressure you apply while sealing. One temperature, Dwell, and PSI setting is not uniformly recommended for each material. For example a better seal can sometimes be obtained with a lower temperature allowed to dwell longer allowing the sealant layer polymers to fully melt together.
Heat Sealer Settings
Here is a table of heat sealer settings which are a good starting point for your testing process.
375 F - 400 F
400 F - 450 F
1 Sec - 1.5 Sec
450 F - 500 F
1.5 - 3 Sec
400 F 425 F
350 F - 375 F
Factors effecting heat sealer settings
Seal strength, and sealer machine settings will be adjusted to the physical properties of the material being sealed to. Clear PET based material generally will use different settings than nylon or foil based material. The material thickness, flange or surface design, physical pouch configuration, size, and feature placement will also be considerations.
Dwell time relates to how long heat is applied to the pouch. Heat and dwell time are not independent variables, they go hand in hand and should not be evaluated separately. Dwell time requires adjustment based on the same factors that effect temperature.
The amount of pressure applied by the heat-sealing equipment will create differences in the heat and dwell settings.
Fouling can occur during the loading process particles, dust, or liquid we left in the sealing zone. If so, these contaminates can affect the settlings required on your sealing machine to seal the bag properly.
Type of Machine
The type and condition of your heat-sealing machine will create another variable to consider. There are several types of heat-sealing machines and how these machines apply heat. Types of heat sealers include Impulse sealers, roller sealers, platen seal.
Ambient temperatures, and humidity can have a small impact on heat or dwell time as well.
There isn’t going to be an exact specification because proper temperature will vary widely based on the conditions mentioned in this article. But here are some of the settings that have been reported to us by customers, as well as our own understanding.
The information provided should only be used as a starting point for the customer’s own investigation, and testing when determining the best settings for your heat sealer machine.