basic design principles of injection molded parts
Scope There is no easy solution to the problems encountered in designing molded articles of plastics. The design will often hinge on what is the best process of molding for the piece in question. The selection of the molding process is, in turn, determined by the choice of the molding material best suited to provide the desired physical properties in the finished molded piece. Often the necessity for certain elements in the design, such as thin sections or long delicate inserts, or requirements of exact concentricity or of accuracy of dimensions and working tolerances, make it desirable to use one technique of molding rather than another. The problem is complicated by the facts that there are two types of molding materials in general use, i.e., the thermosetting and the thermoplastic, and three basic methods of molding commonly used, i.e., compression, transfer and injection molding Frequently in the problem of design it is necessary to put the cart before the horse; we must k...