Ultrasonic welding and plastic properties 1. Ultrasonic welding is a high-tech welding of thermoplastic products. All kinds of thermoplastic adhesives can be welded by ultrasonic welding without adding solvents, adhesives or other auxiliary products. Its advantages are doubled productivity, reduced cost, improved product quality and safe production. ? The principle of ultrasonic plastic welding is that the generator generates a high-voltage and high-frequency signal of 20KHZ (or 15KHZ), and the signal is converted into high-frequency mechanical vibration by an energy conversion system, which is added to the plastic product workpiece, and the temperature transmitted to the interface is improved through the friction between the surface of the workpiece and internal molecules. When the temperature reaches the melting point of the workpiece itself, the interface of the workpiece melts rapidly and then fills the gap between the interfaces. When the vibration stops, the workpiece is at a certain temperature. Second, the characteristics of materials and ultrasonic welding

ABS？ Acrylonitrile butadiene Benzene polymer is light, flexible, hard and resistant to chemical corrosion? This material has good thermal conductivity and is especially suitable for ultrasonic welding.

General? Purpose? ps？ Ordinary polystyrene, light weight, water resistance, chemical resistance? Strong corrosiveness, good stability and insulation. It is especially suitable for injection molding and extrusion molding. Often used in toys, decorations, washing dishes? Equipment, tripod head, lens, floating wheel, etc. Make. Because of its high elastic strength coefficient, it is suitable for ultrasonic welding. ? Acrylic resin? Acrylic, high hardness, resistance to heavy blowing, not affected by acid, has high optical transparency and good coloring. Commonly used in automobile taillights, watch boards, medals, Faucet handle, etc. For ultrasonic welding? We must pay attention to the problem of brightness attenuation.

Influence? ps？ Impact polystyrene? ; Acetal shrinkage? Aldehyde, with high tensile and compressive strength, good wear resistance and the strongest, is often used for training. Screws, bearings, rollers, kitchenware, etc. Because of the low friction coefficient, it is necessary to use ultrasonic welding. Large vibration amplitude and long welding time.

20-30%? Glass? Is it full? PS？ Glass reinforced polystyrene? Cellulose? Ester acid fabric substance? This material is easy to change and change color during ultrasonic vibration. The contact surface is not easy to absorb energy and welding is difficult.

Not modified? PP？ Polypropylene? Light specific gravity, good insulation and strength? High heat resistance and chemical corrosion resistance. After spinning, it can be made into fabrics such as ropes. System? Do you have toys, suitcases and music boxes? Electrical insulation, food packaging, etc. ? This material has a low elastic coefficient and is easy to rot? Acoustic vibration is difficult to weld. ? Norpoly (phenylene ether), with strong performance, good electrical performance and high insulation, is commonly used? Used for electronic parts, etc. Because of its high melting point, it needs to be melted. Long connection time and high amplitude.

Is it full? pp？ Reinforced polypropylene; Nylon,

Nylon? Strong material, wear resistance and extremely low friction coefficient? Acid-resistant, often used as bearings, gears, pipes? , kitchen utensils, brushes, etc. Dissolve with ultrasound? When connecting, the welding time is long due to the high melting point? It is easier to weld by drying before welding.

polyvinyl chloride

Polyvinyl chloride; Electrical services; Weak chemical resistance; Low temperature? Good, flame retardant, often use various combinations? Leather hose, plastic film, etc. Are they all made of soft materials? It is easy to attenuate acoustic vibration and weld the surface. Deterioration ? Polycarbonate? ,? Heat resistance, excellent transparency, tensile bending? High strength, often used in lenses, such as heat pipes, filters, etc. When do you need to weld because the solder joint is high? Interval length. Because the material is hygroscopic, before welding? It should be dried first.

Polyester polyacrylate? High welding energy? Tall? Density? PE？ High density polyethylene? Low specific gravity and flexibility at low temperature and room temperature? Waterproof, corrosion-resistant, can be made into various colors. ? Low-priced products are often used in dishes and packaging? Film, soft water pipe, milk bottle, soft rope, etc. Secret? The higher the degree, the more suitable for ultrasonic welding.

polysulfone

Polysulfone? Hard-working, strong, willful and long-term? Heating will not affect its electrical properties. TV parts, motor parts, etc? . Because the solder joint is high, it needs more energy? Welding. ? Low? Density? PE？ Low density polyethylene (short for low-density polyethylene)

Polystyrene? Lynn. Qxide(ppO) polyoxyxylene is resistant to heat, moisture and chemicals, isn't it? Fear of steam, often used as terminals, rotors, etc. Shell, impeller and pipe fittings, etc. High melting point? This requires high energy welding.