This is a special mold construction that allows the mold to take advantage of opposing forces of projected area. If you are unfamiliar with how projected area us calculated let’s time here to explain, because it is this principle that gives stack molds their reason to exist.

Mold design in which the sprue and runner system is insulated from the hot mold to prevent heating of the thermosetting resin in the sprue and runner. May also be referred to as hot runner molding of thermoplastics and cold runner molding for thermoplastics.

These are the pins in the center of the mold used to pull the sprue away from the nozzle. They have an undercut just below the parting line that is used to ensure that the orifice of the sprue is pulled away. If the pin is too large it will cause the undercut to be […]

The passageway through which the resin melt flows from the nozzle to the mold cavity.

This is a bushing that interfaces with the injection press nozzle and connects to the runner in the plate. The sprue bushing is considered the primary runner channel and will set the cycle if it is too large. It has a nozzle the radius to match the molding press injection unit. The sprue bushing that […]

The channel or feel opening for the passage of material from the nozzle of the injection molding cylinder to the runners of the mold. The plastic piece is formed in this channel.

This is the type of screw that is the most common method to hold plates and components in the mold base together.

Moveable steel sections of the mold containing part of the cavity that are slid out of the way to allow the part to be removed.

The decrease in dimension of a molded part through cooling.

These keep the mold halve together when putting a mold in the press. If the straps are painted orange they will not be easily misplaced. The mold should also have mounting holes in the mold base to store the straps while the mold is in use in the press. This small oversight in the design […]