Designing plastic parts is a complex task involving many factors that address
a list of requirements of the application. ODM Works as a injection mould company can provide mechanical design, industrial design, plastic mold design.
The largest factor to consider when choosing the proper gate type for your
application is the gate design. There are many different gate designs available
based on the size and shape of your part. Below are four of the most popular
gate designs used by ODM Works customers:
The Edge Gate is the most common gate design. As the name indicates, this
gate is located on the edge of the part and is best suited for flat parts. Edge
gates are ideal for medium and thick sections and can be used on multicavity two
plate tools. This gate will leave a scar at the parting line.
The Sub Gate is the only automatically trimmed gate on the list. Ejector pins
will be necessary for automatic trimming of this gate. Sub gates are quite
common and have several variations such as banana gate, tunnel gate and smiley
gate to name a few. The sub gate allows you to gate away from the parting line,
giving more flexibility to place the gate at an optimum location on the part.
This gate leaves a pin sized scar on the part.
The Hot Tip Gate is the most common of all hot runner gates. Hot tip gates
are typically located at the top of the part rather than on the parting line and
are ideal for round or conical shapes where uniform flow is necessary. This gate
leaves a small raised nub on the surface of the part. Hot tip gates are only
used with hot runner molding systems. This means that, unlike cold runner
systems, the plastic is ejected into the mold through a heated nozzle and then
cooled to the proper thickness and shape in the mold.
The Direct or Sprue Gate is a manually trimmed gate that is used for single
cavity molds of large cylindrical parts that require symmetrical filling. Direct
gates are the easiest to design and have low cost and maintenance requirements.
Direct gated parts are typically lower stressed and provide high strength. This
gate leaves a large scar on the part at the point of contact.