Ultrasonic welding is a friction welding process that can be used to weld many thermoplastic products. High-frequency vibration is used to generate such welding friction heat. In ultrasonic welding, a high-frequency dynamic electric field is generated by tuning a metal horn in contact with a bonding substrate. The high-speed vibration of the metal anvil creates friction with the fixed substrate, which generates a large amount of heat at the bonding interface. The welding is completed by pressurizing and cooling, and the formed joint has high strength.
Melt index test method
Melt Mass Flow Rate (MFR)
Melt Volume Rate (MVR)
This method is to determine the melt flow rate of a thermoplastic sample under certain conditions.
This method is suitable for thermoplastics.
1. How to use the pencil hardness tester:
1. It must be carried out in a good laboratory environment, and start the test with a harder pencil
2. Place the installed pencil hardness tester gently on the surface of the object to be tested
3. Grasp both sides of the pulley with your fingers, and push forward 10mm at a speed of 5…10cm/sec, one time, no dragging back and forth
4. Observe whether the surface of the sample is scratched with the naked eye?
5. In the order of pencil hardness, gradually test from hard to soft until the tip of the pen does not scratch the coated surface at all
6. Note: Any scratches or damage caused by the pen tip are regarded as scratches