Injection Blow Molding.
A preform (this looks like a test tube with bottle cap threads) is injection molded in one cavity, removed and then placed into another where it is pressurized with gas to stretch the hot preform into a thinnerwalled
seamless bottle or container such as a milk bottle or gas tank. This is depicted in Figure 7. This is an extension of injection molding more than a variation.
Injection Compression/Coining.
With this technique the mold is only partially closed during injection. At the appropriate time and with the right amount of plastic in the mold, the clamp is then completely closed, forcing (compressing) the plastic to the shape of the mold cavity. A variation on this is coining.
The clamp is closed but the mold has components that compress the plastic in the cavity as the plastic cools. Coining is where the cavity volume is changing during the solidification of the plastic. Plastic is injected into the cavity and then the movable platen closes completely, or a mold component moves to compress the
plastic to compensate for shrinkage or densification.
“Injection Molding” in EPSE 2nd ed., Vol. 8, pp. 102–138, by I. I. Rubin, Robinson Plastic Corp.
JOHN W. BOZZELLI
Midland, Michigan
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China Custom Plastic Injection Molding Maker
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