​Thermoplastic elastomers(TPE), sometimes referred to as thermoplastic rubbers, are a unique class of engineering materials combining the look, feel and elasticity of conventional themoset rubber with

Plastic injection molds can be classified into two groups: two-plate molds and three-plate mold. Two-plate molds have one parting line or parting face. The workpiece and residual are ejected at sam...

The family of cellulosics which are the most widely used includes cellulase acetate, cellullose acetate butyrate, cellulose propionate, and ethyl cellulose.Cellulosics are characterized by good streng

The design of mold parts always depends on the operation of the workpiece, hence only general constructions of type can be shown. When the temperature drips the state of plastic material changes fr...

Outstanding properties of fluorocarbon polymers(or fluoroplastics) include inertness to most chemicals and resistance to high temperatures. Fluoro plastics have a rather waxy feel, extremely low coeff

The mold parts in motion are guided by guide pins and guide sleeves. The conventional guiding methods and fitting are shown in Fig. 6. 1. Regarding cost, the method shown in Fig. 6. 1a is the cheap...

Undercut-forming side inserts can be automated by use of pneumatic or hydraulic cylinders fixed to the mold. These control elements are arranged on the movable part of the mold such as the frame or...

Plastic polymers of formaldehyde correctly called polyoxymethylenes(POM), polyoxymethylenes are about the strongest and stiffest thermoplastics, and also are characterized by excellent fatigue life an

In Fig. 7. 37 the gear 4 driving the racks 3 and 5 is turned by hand. The lower rack 5 is supported by pins 1. The upper rack 3 is supported by the guide used for guiding the side insert. Turning h...