Abstract
Abstract The anisotropic behavior of an injection molded part from a disk mold is reported. It is concluded that orientation rather than state of cure is responsible for the anisotropic behavior. The slow strain recovery process of elongational deformation of the uncured rubber is the major factor in introducing orientation. This example is used to illustrate the viewpoint that the total injection molding process should be investigated from an integral approach which takes into account the interactions of parameters in various areas. Engineering concepts such as the unit operations approach have been gradually gaining acceptance in injection molding of rubber, and compound development continues to progress satisfactorily. However, the success of injection molding will largely depend on the skillful manipulation of material characteristics, design parameters, and operating variables under some unfavorable constraints to meet the cost and performance requirements.
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