Internal component damage after ultrasonic welding

04 Apr 2019

The reason for the internal original damage is that the high-intensity ultrasonic energy is directly or indirectly transmitted to the damaged part. The solution is as follows: 1. Early ultrasonic vibration time (avoid contact and vibration); 2. Reduce the pressure and reduce the ultrasonic welding time (reduce the strength standard); 3. Reduce the number of power stages of the machine or the low-power machine. On the contrary, it is necessary to use high-power ultrasonic welding equipment to complete the welding task in the shortest time with high and light ultrasonic energy. The welding process is not enough to cause damage to the product. ; 4. Reduce the expansion ratio of the ultrasonic mold; 5. The cushion of the bottom mold is cushioned with rubber; 6. The bottom mold and the product avoid floating or gap; 7. HORN (upper mode) re-measures the frequency after avoiding the air; 8. After the upper mold is emptied, stick a flexible material (such as silicon lycium, silica gel, etc.).

Read More

Mask spot welder machine

29 Mar 2019

Ultrasonic non-woven mask spot welding machine principle The non-woven mask spot welder converts 50/60 Hz current into 20 kHz by ultrasonic generator. The transducer is again converted into a mechanical motion of the same frequency and transmitted to the welding head through the amplitude modulator. The welding head transfers the received vibration energy to the joint portion of the nonwoven fabric mask to be welded, and the vibration energy is converted into heat energy by friction to melt the nonwoven fabric. The two-sided non-woven fabric is solidified by molecular chaining, and the perfect combination is achieved, thereby achieving the welding effect. Equipment using this principle includes: mask ear belt spot welding machine, non-woven mask welding machine, non-woven mask point press, non-woven mask sewing machine, ultrasonic mask lace machine, ultrasonic mask spot welding machine, medical mask point Welder, automatic mask ear strap welding machine. Ultrasonic non-woven mask mask ...

Read More

Influence of air pressure on ultrasonic welding

23 Mar 2019

In ultrasonic welding, the pneumatic pressure transmits ultrasonic vibrations to the weldment through the sonotrode. Different materials determine the amount of pressure required during welding. Choosing a suitable pressure value has a very important influence on the welding results. The following small series will let you know the effect of the pressure on the ultrasonic welding. If the air pressure is too low, the ultrasonic vibration will not be transmitted to the weldment well, resulting in insufficient friction between the weldment and the weld surface. A large part of the energy will be worn on the sliding surface, and the final result is Can not form an effective weld. If the air pressure is too high, the vibration energy will be used unreasonably, and the frictional force will be too large, the frictional motion between the weldments will be weakened, and even the amplitude will be affected. The result is the connection between the weldments. The area does not increase but decr...

Read More

Effect of release agent on ultrasonic welding

15 Mar 2019

 Effect of release agent on ultrasonic welding The external release agent (zinc stearate, aluminum stearate, fluorocarbon, silicone) is usually sprayed onto the surface of the cavity to form a separate coating that facilitates removal of the part. The release agent may be transferred to the bonding surface, reducing the coefficient of friction of the material to be welded, affecting the heat generation of the bonding surface, hindering the fusion of the molten surface and forming a suitable connection. Silicone has the most harmful effects. The external release agent can sometimes be removed with a solvent. If an external release agent is necessary, the coatable, printable release agent is not transferred to the molded part, but the resin is prevented from wetting the mold surface. These levels of release agent have the least harmful effect on ultrasonic welding.

Read More

Effect of additives on ultrasonic welding

09 Mar 2019

Additives, although improving the overall properties or formability of the base metal, often increase the difficulty of obtaining a high quality welded joint. Typical additives include: plasticizers, impact modifiers, flame retardants, colorants, lubricants, blowing agents, regrinds. Plasticizers, high temperature organic liquids or low temperature melts increase the flexibility and softness of the plastic and reduce its rigidity. They reduce the intermolecular attraction within the polymer and affect the transmission of vibrational energy. Highly plasticized materials such as vinyl are very poor ultrasonic energy transfer media. Plasticizers are often considered as internal additives, but they migrate to the surface over time, making ultrasonic welding almost impossible. Metal-containing plasticizers are more harmful than plasticizers approved by the US Food and Drug Administration (FDA). Impact modifiers such as rubber reduce the ability of materials to transmit ultrasonic vibrations...

Read More

Effect of fillers and reinforcements on ultrasonic welding

01 Mar 2019

The performance of plastics affects the effect of ultrasonic welding. The ultrasonic welding properties of plastics depend on the plastics' ability to attenuate ultrasonic vibrations and the melting temperature as well as physical properties such as elastic modulus, impact resistance, friction coefficient and thermal conductivity. In general, the greater the hardness of a plastic product, the easier it is to weld. Plastics with high hardness tend to transmit ultrasonic energy, while soft plastics often attenuate energy before energy reaches the joint area. The hardness of plastic products will also vary with ambient temperature and humidity. Pigments, mold release agents, glass fillers and reinforcing fibers have a greater impact on it. Effect of fillers and reinforcements on ultrasonic welding Fillers (glass, talc, minerals) in thermoplastics can improve or inhibit ultrasonic welding. Materials such as calcium carbonate, kaolin, talc, aluminum hydroxide, organic fillers, silica, glass...

Read More