The working principle of the Ultrasonic welding machine is as follows. It relies on the vertical vibration stretching, heating and welding of the object to weld various products. The mechanical principle is to convert electrical energy into mechanical energy. But how to solve the problem of improper matching of plastic products and materials?
Different from the ultrasonic fabric welding machine used for welding fabrics, each plastic material has a different melting point. For example, AB is about 115°C, PC is about 145°C, and PE is about 85°C. For example, the melting points of ABS and PE are different, making ultrasonic welding difficult. There is a gap between ABS and PC, but the difference is not big, and it can be welded. Therefore, if the ultrasonic output is the same and the energy amplification factor is the same, there is no doubt about the welding effect of different plastic materials. The welding effect is as good as the same material.
So why is there a difference in gloss? For injection-molded plastic products, the difference in gloss is most obvious on the surface of textured products. Even if the mold surface is very uniform, the product may show irregular gloss. In other words, some molds do not reproduce the surface effect of the product very well.
How to solve it, we recommend that you use the following methods to test and solve. 1. Increase the ultrasonic vibration time of the ultrasonic welding machine (avoid contact vibration). 2. Reduce the pressure and reduce the welding time of the ultrasonic welding machine (lower strength standard). 3. Reduce the number of power levels in the machine or choose a low-power machine. 4. Reduce the magnification of the ultrasonic mold. 5. The part that supports the ultrasonic bottom type is cushioned by rubber. 6. Make sure that there is no overhang or gap between the ultrasonic bottom mold and the product. 7. After cutting the ultrasonic perforation, re-measure the frequency. 8. After punching the upper mold, attach elastic material (silicone, etc.).
As the distance between the melt and the gate gradually increases, the melt injection pressure gradually decreases. If the far end of the product gate cannot be filled, the pressure will be the lowest and the mold surface texture will not be copied to the product surface correctly. Therefore, the area with the highest cavity pressure (half of the fluid path from the gate) is the area with the smallest difference in gloss.
To change this situation, you can increase the temperature or pressure of the molten resin and the mold. You can also reduce the difference in gloss by increasing the pressure hold time.
Good design of plastic products can also reduce the possibility of different gloss. For example, using a fully automatic folding mask machine to weld the ear straps of masks, breathing valves and other plastic parts, sudden changes in product wall thickness will cause irregular flow of molten resin, making it difficult to replicate the surface texture of the mold to the surface of the product. Many surgical mask machines Such problems can also occur. Therefore, a uniform wall thickness design can reduce the occurrence of this situation, while an excessively thick wall thickness or too many ribs increase the possibility of gloss differences. In addition, insufficient melt exhaust is also a cause of such defects.
The above is what Haobang introduced to you about the material problems and other related situations when the ultrasonic welding machine welds plastic products. Haobang is a professional ultrasonic welding machine supplier in China, and our ultrasonic fabric welding machine can be used to manufacture medical products. Masks have high sales and good reputation. They were exported to many countries during the epidemic. In addition, we also provide surgical mask machines, fully automatic folding mask machines and other welding machines. Please visit our website to learn more.
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