Classifications
of Injection Molds
GENERAL NOTES
.............................................................................................................................................................................................The following classifications are guidelines
to be used in obtaining quotations and placing orders for uniform
types of molds. It is our desire through these classifications
to help eliminate confusion in the mold quote system and increase
customer satisfaction.
It is strongly recommended that mold
drawings be obtained before construction is started on any
injection mold. Even though parts may seem simple enough not
to warrant a mold design, a drawing showing sizes and steel
types will pay for itself in event of mold damage.
As the applications
of plastics become more sophisticated, so must mold designs.
When designing a mold for a difficult part there are resources
available to the moldmaker and molder to confirm the best
mold design. For these designs it is recommended that a computer
aided flow and/or cooling analysis be performed. these programs
may help determine the best mold design, saving time and
cost of design rework.
These classifications are for mold specifications
only and in no way guarantee workmanship. It is very important
that purchasers deal with vendors whose workmanship standards
and reliability are well proven.
Mold life, because of variations
in part design and mold conditions cannot be guaranteed.
This guide will attempt to give approximate cycles for each
type of mold excluding wear caused by material abrasion, poor
mold maintenance and improper molding technique.
Maintenance
is not the responsibility of the moldmaker. Normal maintenance
such as replacement of broken springs, broken ejector pins,
worn rings, or the rework of nicks and scratches should be
borne by the molder. Mold rework costs should be closely
considered when deciding which classification of mold is required.
This
document does not constitute a warranty or guarantee by the
Society of the Plastic Industry, Inc., or its members for
the classifications or specifications set forth herein.
