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The Ultimate In Plastics Welding |
| Date Added: December 11, 2008 08:17:30 AM |
| Author: |
| Category: Plastics |
| Ultrasonic welding, the preferred choice in plastics welding, is perhaps the most rapidly developing field in the industry. It uses high-frequency vibrations and pressure - not heat - to melt plastic pieces together. By creating frictional heat that melts plastics, these ultrasonic welding machines are used weld small- and medium-sized pieces of plastic. When the vibration stops, the plastic quickly cools and becomes solid again. In addition to being quick and repeatable, ultrasonic welding machines do not use any additional materials, known as "consumables." So, no screws, nails, bolts, soldering materials, glues or other adhesives are required. And because finished pieces come out strong and clean, ultrasonic welding machines are also used to create hermetic seals. Another benefit is they require no ventilation system, because no heating is involved. The ultrasonic process begins with two thermoplastic pieces that have similar melting points. They are placed together, one atop the other, in the ultrasonic welding machine. Then, high-frequency vibrations are applied directly to the joint being welded. With the vibration application concentrated in the joint itself, the process melts the joint but not the base materials. When the plastic melts, the vibration is stopped and pressure is applied - and the plastics are melded. Because the process is as fast and efficient as it is, weld times are sometimes less than a second. More and more industries are coming to rely on ultrasonic welding machines. They include the automotive, cosmetic, computer, appliance, toy, medical, electronics, textile, packaging and food industries. Ultrasonic welding is often used in the medical field because the process can ensure that no parts are contaminated by outside substances, which is why products welded with ultrasonic welding machines are able to be used for "clean rooms" in hospitals. The food and packaging industries also favor ultrasonic welding, again because the process is clean and contaminant free. Ultrasonic welding has come a long way and is now one of the most progressive industrial techniques. It was in the late 1940s that ultrasonic waves were first used - mostly for cleaning. Then, in the 1950s, ultrasonic welding was introduced as a way to weld plastics and metals. In 1965, the patent for the process was granted to two men - Robert Soloff and Seymour Linsley. The popularity of ultrasonic welding began with the toy industry and has spread to a growing number of applications every year. Now, ultrasonic welding is the leading assembly method for rigid thermoplastics. Among the models of ultrasonic welding machines are ultrasonic hand guns; bench-top integrated ultrasonic welders; automation ultrasonic actuator heads and modular power supplies; and closed-loop process controls, like energy welding, distance welding, time welding, force welding, automatic frequency tuning and variable-amplitude output control. Plus, there are microprocessor and standard-time models available, and tools of the trade for all makes, models and brands of ultrasonic welders, like ultrasonic horns, fixtures, converters and boosters. When it comes to companies that provide plastic assembly solutions, look for top-notch service and technical support and a company that meets each customer's individual needs. |
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