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Polymer Mold Engineering specializes in moldmaking,
toolmaking, and top tool design. Once mold design is complete, molds are then
skillfully made by molders with specialized tools. Our work can be seen in
automotive parts, houseware parts, and many other industries. We are experts in
surfacing and modeling, and can also help with mold repair and tool repair.
Injection molding is a manufacturing technique for making parts from
thermoplastic material in production. Molten plastic is injected at high
pressure into a mold, which is the inverse of the product's shape. After a
product is designed by an Industrial Designer or an Engineer, molds are made by
a moldmaker (or toolmaker) from metal, usually either steel or aluminum, and
precision-machined to form the features of the desired part. Injection molding
is widely used for manufacturing a variety of parts, from the smallest component
to entire body panels of cars. Injection molding is the most common method of
production, with some commonly made items including bottle caps and outdoor
furniture.
Compression molding is a method of molding in which the molding material,
generally preheated, is first placed in an open, heated mold cavity. The mold is
closed with a top force or plug member, pressure is applied to force the
material into contact with all mold areas, and heat and pressure are maintained
until the molding material has cured. The process employs thermosetting resins
in a partially cured stage, either in the form of granules, putty-like masses,
or preforms. Compression molding is a high-volume, high-pressure method suitable
for molding complex, high-strength fiberglass reinforcements. Advanced composite
thermoplastics can also be compression molded with unidirectional tapes, woven
fabrics, randomly orientated fiber mat or chopped strand. The advantage of
compression molding is its ability to mold large, fairly intricate parts.
Compression molding produces fewer knit lines and less fiber-length degradation
than injection molding.
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