Precision molded parts

PET s broad range of properties make them ideal replacements in certain applications for such metals as die-cast aluminum or zinc also in thermoset switches, relays, sensors, etc. Applications include packaging (particularly stretched injection blow molded beverage bottles and film), appliances, electrical/electronics, etc. PET finds applications in such diverse end uses as fibers for clothing, films, botdes, food containers, and engineering plastics for precision molded parts.118-120 A wide range of applications is possible because of the excellent balance of properties PET possesses and because the degree of crystallinity and the level of orientation in the finished product can be controlled. 

Injection molding machine. Because the principal application of LCP is fine and precisely molded parts, the electromotive injection-molding... 

Close tolerances can be achieved provided that operating variables of the process are tightly controlled. Mold design is, however, the other critical factor in obtaining high precision molded parts. As tolerances... 

Micromolding is precision molding of extremely small parts and components usually in engineering plastics unfilled, filled, and/or reinforced. Parts usually weigh less than 20 milligrams (0.020 g), with some even less that 0.1 mg in products as small as one mm3. Products are measured in microns and have tolerances of 10 microns or less. A micron (pm) is one-millionth of a meter 25.4 pm make up one-... 

The equipment is designed to operate without failure for more than 20 years. In its design, the flow properties of plastic components are important since a degree of high precision must be maintained in the molded part because metal contacts are frequently very close (less than 1 mm apart). Good flow in the mold is required because some sections are very thin. In the more demanding applications, PPS is used. 

Molded, net-shape applications Electrical connectors Precision plastic parts Tubing, beams... 

MAJOR APPLICATIONS Multiplicity of applications in technical engineering, especially in automotive and electrical industries. Antistatic parts. Precision molding. Sports and leisure goods. Coatings by extrusion, fluidized bed, or electrostatic process. 

Uses Polyamide for precision engineering parts, hollow moldings, motor industry, sports gear, metal coating, tubing, hoses, etc. 

This system measures dimensional changes as a function of temperature. The dimensional behavior of a material can be determined precisely and rapidly with small samples in any form—powder, pellet, film, fiber, or molded part. The parameters measured by thermomechanicai analysis are the coefficient of linear thermal expansion, the glass-transition temperature (Fig. 10-17), softening characteristics, and the degree of cure. Other applications of TMA include the taking of compliance and modulus measurements and the determination of deflection temperature under load. 

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