1, Abstract

Ultrasonic welding is a welding thermoplastic products, high technology, all kinds of thermoplastic rubber pieces can be used ultrasonic welding treatment, but without added solvents, adhesives, or other supplements. The advantage is increased many-fold productivity, reduce costs, improve product quality and safety in production.

Principles of ultrasonic plastic welding is a generator 20KHZ (or 15KHZ) high-pressure, high-frequency signals through the transducer system, the signal is converted to high-frequency mechanical vibrations, plus parts in plastic products, and through the workpiece surface and the inner molecules of the Friction Er Shi sent to the interface temperature, when the temperature reaches the melting point of this piece itself, so that the rapid melting of the workpiece interface, and then fill in the gap between interfaces, when the vibrations stop, the workpiece while cooling under the pressure of a certain setting, it to achieve the perfect welding results.

2, materials and welding characteristics of ultrasonic

ABS

Acrylonitrile butadiene

Benzene Arts ene copolymers, light weight, both brake sex, rigidity and chemical resistance

Sex, use a wide range, good thermal conductivity of this material,

Particularly suitable for ultrasonic welding.

General purpose ps

General polystyrene, the proportion of light, water and chemicals of the corrosion resistance of strong, stable, good insulation, especially suitable for injection and extrusion molding, commonly used in toys, ornaments, Meng washing equipment, Iwako, lens, floating wheels, and manufacturing. As the elastic coefficient of strong high, suitable for ultrasonic welding.

Acrylics

Acrylic, hardness, resistance to blows, without acid, on the role, there is a high degree of optical clarity, color of good, commonly used in automobile tail lights, meaning the table plates, medals, faucet handles. Ultrasonic welding is used when the issue of transparency should be noted that bad.

Impact ps

Blow-resistant polystyrene;

Acetal

Acetal, tensile and compressive strength and wear resistance good, strong braking and strong nature of the most commonly used for access training, screws, bearings, rollers, kitchen utensils and so on, because of grinding coefficient is low, when you need to use ultrasonic welding of high vibration amplitude and a longer welding time. 20-30% glass Filled PS

Woven glass reinforced polystyrene

Celluloeics

Ester acid fibrous substances, ultrasonic vibration material easy to change color, contact surface is not easy to absorb energy, welding more difficult. Unmodified PP

Polypropylene, the proportion of light, good insulation, high strength and heat and chemical agents can be corrosive, snag the key link, etc. After the fabric can be made into rope. Products have toys, luggage, music shell, electrical insulation, food packaging. Due to the low coefficient of elasticity of this material, easy to attenuation acoustic vibrations, difficult to weld.

Noryl

Polyphenylene ether, was extremely brake, electrical good, high degree of insulation, commonly used for electronic components. Due to the high melting point, the required welding a long time and high amplitude.

Filled pp reinforced polypropylene;

Nylon,

Nylon material strong brake, wear resistance, low coefficient of friction, acid, commonly used for bearings, gears, pipes, kitchen utensils, brush and so on. Using ultrasonic welding, because of the high melting point, the required welding for a long time before welding will be easier to weld through the dryer.

PVC

PVC, electrical paternity, weak resistance to chemicals, low-temperature nature of good, a flame resistance, commonly used in a variety of synthetic leather hoses, film material, material is soft, easy to attenuation of acoustic vibrations, easy to weld surface deterioration.

P.C.

Polycarbonate, heat-resistant, with excellent transparency, tensile, and twists and turns, high strength, commonly used in lenses, such as heat pipes, filters, and so on. Melting point due to the high welding required for a long time. As a hygroscopic material, welding should be preceded by drying.

Polyster poly-acid resin; fusion energy great

High Density PE

High-density polyethylene, the proportion of small, low temperature and room temperature, Qu Xing Fu soft, waterproof, corrosion can be made into a variety of colors. Low prices of products, commonly used in the Min Pan, packaging film, soft water pipes, bottles, soft rope and so on. The higher the density the more suitable for ultrasonic welding. Polysulfone

Polysulfone, quality hardware, high strength, a self-willed, long-term heat does not affect its electrical properties, often retaining the mood for the TV parts, motor spare parts. Melting point due to the high energy required to weld higher.

Low Density PE

Low-density polyethylene

Polypheny lene Qxide (ppO)

Poly-p-xylene oxidation, heat in the moisture resistance, chemical resistance, are not afraid of