Comparison of Ultrasonic and Hot-melt Welding Process of PTFE Waterproof and Venting Membrane

2023-01-17 13:29:03 VENTING 41742

The ultrasonic and hot-melt welding process of PTFE venting membrane depends on the material of plastic parts and waterproof venting membrane. Learn the ultrasonic hot-melt welding knowledge together.

Application of waterproof venting membrane:

Waterproof and venting membrane is both venting and waterproof, and is generally made of PTFE as the basic material. It is widely used in new energy electric vehicles (battery pack, motor, electric control, start and stop power supply, distribution box, gearbox, electronic vacuum pump, lamp, sensor, etc.), outdoor LED lighting (wall washing lamp, projection lamp, street lamp, stage lamp, warning lamp, etc.) Consumer electronics (electric toothbrush, electric hairdresser, electric beauty instrument, waterproof camera, electronic scale, floor sweeper, etc.), electroacoustic field (mobile phone speaker, MIC, earpiece, speaker, buzzer, microphone, interphone, recorder, GPS, Bluetooth headset, Bluetooth speaker, etc.), medical field (infusion set, urine bag collector, etc.), intelligent wearing field (smart watch, smart bracelet, VR glasses, etc.), UAV equipment Sensor laser radar, semiconductor processing, intelligent equipment, precision instruments, solar photovoltaic, 5G communication equipment, chemical packaging, microfiltration and other fields.

When ultrasonic welding is used for waterproof venting membrane, plastic parts must be hard plastic, such as nylon, pc, ABS, PS, etc., while hot-melt crimping can be used for soft plastic, such as EVA, rubber, etc.

Venting Gasket


Ultrasonic welding venting membrane needs to be designed with welding ribs, and hot fusion crimping also needs to be done.

The hot-melt crimping of the waterproof and venting membrane is through high-temperature thermal plastic parts, but the high-temperature resistance of the waterproof and venting membrane is different. Therefore, some plastic parts with high melting point and the venting membrane are pressed by ultrasonic welding instead of hot-melt.

If both ultrasonic welding and hot-melt crimping processes can be used, we should understand that the ultrasonic welding process has a short processing time, and the processing time of a single piece is only 5s, but it can only be used for 1 out of 1; However, the hot-melt pressing process takes a long time, with a processing time of 8s, but it can achieve more than 1. There are two commonly used welding methods for PTFE waterproof and venting membrane. The main method is to weld the venting membrane on the plastic and fix it to achieve the sealing effect. One is hot-press welding machine, and the other is ultrasonic welding. According to different applications, the selection of welding methods is also different. The aluminum foil gasket of the bottle cap and the vent valve of the automobile headlight are made by ultrasonic technology. By comparison, hot-press welding is more common and unreliable. Next, we will introduce the advantages and disadvantages of the two welding methods. The hot-pressed waterproof and venting membrane welding machine uses the hot-melt process to weld the membrane and plastic sheet. According to the output, it can weld multiple membranes at one time. Use a small hot-melt welding machine for welding, and the effect of hot-melt welding is stable and firm. The main principle is to use the difference between the melting point of the plastic sheet and the membrane to melt the plastic sheet and weld the membrane. The waterproof and venting membrane can be made of a variety of materials with different melting points. There are many manufacturers of waterproof and venting membrane, but there are not many truly venting and waterproof membranes. The hot rivet head of waterproof venting membrane is made of copper, which can transfer temperature faster. The hot-pressed waterproof and venting membrane welding machine adopts the plate structure and electric heating method. The whole machine is in the form of frame, which is composed of three large plates: upper template, lower template and hot template, and is equipped with hot mold and upper and lower plastic cold mold. The action mode is pneumatic control. The heating power and mold size can be set according to the size of different plastic parts to realize the welding of various plastic parts, which is simple to operate and convenient to use. The welding of the waterproof and venting valve (plug) of the automobile headlight uses ultrasonic technology and hot-pressing technology. The ultrasonic process is to put plastic parts at the welding head fixture according to the actual requirements, and start the button switch to complete the welding. The method is very simple.