ABSTRACT
A major problem in injection molding is removal of the part from the mold. If the part has a large surface area or a certain type of surface, it may be almost impossible to remove the piece without damage. The force of the ejector can be increased to some extent, but this increases the possibility of damage to the piece. The use of some type of mold treatment is well known in the industry. The most common treatment is spraying a silicon-or fluorocarbon-type mold release agent directly on the mold. This procedure makes it considerably easier to remove the piece from the mold, but unfortunately it causes other problems. The spray-on mold release is typically good for eight to 10 moldings and then must be resprayed. Continued respraying eventually causes a buildup on the mold, which must be removed. Both the respraying and the cleaning cause an increase in cycle time.
