1、 Temperature setting rang
Conventional reference value
When high-frequency welding TPU, the heating temperature of the mold is usually controlled at 80-110 ℃ (with a current of 0.3-0.5A, a time of 5-10 seconds, and a pressure of 9-10kg);
When using a high-frequency machine, the recommended operating temperature is ≤ 120 ℃ to avoid TPU material aging or deformation due to overheating.Sliding Table Plastic Welding Machine,Hf Welding Machine For Blister Packaging
Material property adaptation
Ordinary TPU has a long-term temperature resistance of about 80 ℃ and an instantaneous temperature resistance of no more than 120 ℃; High quality temperature resistant TPU can withstand 120 ℃ (long-term) and 160 ℃ (instantaneous);
If low-temperature TPU hot melt adhesive film (melting range 50-90 ℃) is used, the recommended lower limit for welding temperature is 70 ℃.
2、 Key operating parameters
Explanation of the role of parameter recommendation range
Ensure that the material melts and does not decompose at a temperature of 80-110 ℃
High frequency oscillation heating achieved by combining current 0.3-0.5A with temperature
Time 5-10 seconds to avoid insufficient fusion due to being too short
Pressure 9-10kg to ensure uniform welding of the contact surface
3、 Precautions
The mold needs to be preheated to 70-90 ℃ (unloaded state) to avoid cold start affecting the welding effect;
After the device is turned on, it needs to be preheated for 5 minutes to ensure the stable operation of the high-frequency oscillator;
Adjust the electrode spacing and pressure according to the thickness of TPU. For thin materials such as life jackets and warm waist belts, it is recommended to reduce the pressure to 4-4.5kg;
After welding is completed, it is necessary to cool it in a timely manner to avoid residual stress that may cause cracking of the weld seam.Hf Pvc Membrane Structure Welding Machine
4、 Application adaptation case
TPU inflatable life jacket: using a high-frequency heat sealing machine, with a temperature of 80-90 ℃, and sealed and welded with 15T pressure;
TPU Warm Belt: The high-frequency welding temperature is set at 100-110 ℃, combined with an automated control system to improve consistency.Household sealing machine
It is recommended to fine tune the parameters based on the specific TPU model (such as whether it contains plasticizers and thickness) and equipment model, and verify the effect through trial welding.