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With the rapid development of China's industrial and mechanical industries, more and more industries will use ultrasonic plastic welding machines. So, do you know the necessary conditions for ultrasonic welding of high-quality plastics? It doesn't matter, then the ultrasonic plastic welding machine manufacturers will come to introduce you, interested friends will come and see.
Ultrasonic welding requirements for raw materials
When it comes to ultrasonic welding, you have to mention its requirements for various resins. The most important factors include polymer structure, melting temperature, flexibility (hardness), and chemical structure.
First, the polymer structure:
The process of bonding monomers together is called "polymerization," and polymers fall into two broad categories: thermoplastic and thermoset.
After the thermoplastic material is thermoformed, it can be softened and molded again. The base undergoes only a change in state - this property determines the adaptability of the ultrasonic compression of the thermoplastic material. According to the molecular structure can be divided into: amorphous polymer, semi-crystalline polymer.
1. The non-crystalline polymer molecules are disordered in arrangement, and there is a significant temperature (Tg glass transition temperature) which gradually softens, melts and flows to the material. Such resins are generally effective in transmitting ultrasonic vibrations and achieving good welding over a wide range of pressures/amplitudes.
2. The semi-crystalline polymer molecules are arranged in order, with obvious melting point (Tm melting temperature) and re-freezing point. The solid crystalline polymer is elastic and absorbs some of the high frequency mechanical vibrations. Therefore, such polymers are not easy to transmit ultrasonic vibration energy to the pressing surface and are difficult to weld.
Thermosetting materials are produced by irreversible chemical reactions. Reheating or pressurization does not soften the formed thermosetting products. Therefore, thermosetting materials have traditionally been considered to be unsuitable for ultrasonic waves.
Material compatibility
Second, other factors affecting the welding effect
1. Materials with water absorption properties, such as polycarbonate, polysulfone, and nylon.
2. The ratio of the mixture should be noted after the plastic is added to the mixture.
3. Problematic release agent: Silicone grease, Teflon, internal lubricant, toner, recycled material, fire retardant, etc.
I believe that everyone has a certain understanding of the necessary conditions for high-quality plastic ultrasonic welding, then today, ultrasonic plastic welding machine manufacturers will not talk to everyone, if you still have questions, you can call directly. Contact us for advice, we will contact you in the first time.

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