Polycarbonates plastics are among the strongest, toughest, and most rigid thermoplastics. In addition, they have a ductility normally associated with the fofter, lower-modulus thermoplastics. They are

The external thread on the workpiece is formed by wedge inserts as shown in Fig.7.32. By exchanging the worm in modern injection machines they are also suitable for the injection of thermosetting p...

The nylon family of plastics are identified by the number of carbon atoms in the monomers. Where two monomers are involved, the polymer will carry two umbers (e.g.nylon 66). Crystalline nylons have hi

The wedge inserts forming the undercuts are arranged on all four sides of the workpiece and come apart automatically upon opening of the mold as shown in Fig.7.31. The cube-shaped workpiece is prov...

ABS plastic is an easily machined, tough, low cost rigid thermoplastic plastic with high impact strength, ideal for turning, drilling, milling,sawing, die-cutting, shearing.

The wedge inserts can be lifted above the dividing plane of the mold with buttons actuated by lifting bars as shown in Fig. 7.28. The wedge insert 2 is opened by the inclined ide cko. During ejecti...

Polystyrene is one of the most widely used plastics, and is an aromatic polymer made from the monomer styrene, a liquid hydrocarbon that is manufactured from petroleum by the chemical industry. In che

The shape of the elbow pipes is spark erosion machined into blocks 26 and 24. The lower and upper parts of mold require careful fitting, otherwise workpieces will not be aesthetically accep table. ...

Polyvinyl chloride if produced by polymerization of the monomer vinyl chloride (VCM), as shown. About 80% of production involves suspension polymerizations. Emulsion polymerization accounts for about