A systematic method for adjusting the heat sealing parameters of membrane materials

A professional parameter adjustment process follows a closed loop of "setting-testing-inspection-curing".

Process Details:

Start and Preparation:

Environment: Ensure the process is conducted in a stable and clean environment, recording temperature and humidity.

Equipment Status: Clean the heating wedge and pressure rollers, ensuring no old material residue remains.

Membrane Material Confirmation: Verify the membrane material model and batch number; coating formulations may vary slightly between different batches.

Initial Setting:

Refer to the recommended parameter range provided by the membrane material supplier.

If no data is available, start with a lower temperature and slower speed, gradually adjusting upwards. This is safer than adjusting downwards from excessively high parameters (to avoid damaging the material).

Trial Welding and Destructive Testing:

This is the inspection standard.

Peel Test: Tear the test piece apart at the weld seam.

Ideal Scenario: Failure occurs in the base material, not the weld seam. This indicates that the weld strength > the base material strength.

Acceptable Condition: Partial failure occurs at the weld, but the peel strength meets standard requirements (typically 80%-90% or more of the base metal strength).

Unacceptable Condition: Easily and neatly peels off from the weld.

Parameter Interaction Adjustment Tips:

Problem: Insufficient weld strength, but nearing the temperature limit.

Solution: Reduce speed and increase heat treatment time, rather than blindly increasing temperature.

Problem: Weld appearance is wavy or shrinking.

Solution: Check for sufficient cooling, or appropriately reduce pressure.

Establish a "Parameter Profile":

Save the determined optimal combination (temperature, speed, pressure, cooling settings) and test data.