A three-plate mold usually refers to molds that have a top gate. So, a simple two-plate mold with a top gate becomes referred to as a three-plate mold. The name three-plate is derived from the plate openings. There are two openings between the three plates: one to remove the runner and the other to remove […]

A pair of wires of dissimilar metals or alloys, the two junctions of which produce a current when they are touching a surface that has heat energy. The net electromotive force, or current, is sufficient to drive a galvanometer or potentiometer and tell a correlation of how much heat is at the junction.

These guide the mold halves back together. They should be on the centerlines of the mold. Some locks do not have an angle and are straight. The designer should always take care to make sure that if the locks are on and angle they should be at least one degree less than any shut off […]

This a machine with a rotating grinding wheel that is used to finish flat surfaces, forms, side walls, slots, shoulders, and heels. It primarily used for mold plates or finish grinding of hardened tool steel.

These round ground posts are used to support the plate above the ejector housing. The functions of support pillars are to help prevent the plate deflection caused by injection molding pressure. Without this support along with thickness of the support plate the mold can bow under injection pressure and cause flash. When a mold has […]

This is a pin with an undercut that is directly above a cold runner drop. It is used to de-gate the runner from the part. If the undercut is too sever the material will chip or flake and will lodge in-between the runner plate and cause damage.

In the case of a typical stripper plate mold the ejector system would not be necessary. This would eliminate the need for a rails, ejector retainer plate, ejector bottom plate. The stripper plate is used to mount the stripper ring in the mold base. This plate is usually on top of the core plate and […]

These are used to limit plate travel. The length of the bolts is given from the bottom of the head to the end of the body. The tapped hole is always smaller than the body. The placement of the stripper bolt follows the same rules as the screws. The most common problem with stripper bolts […]

All LSR’s are made of at least two streams. The A & B components are individually called this prior to entering the static mixer. Additional streams can be added as required to achieve the desired characteristics of the final molded product. Examples of this most commonly are pigments for color and oils for scent, Antimicrobial, […]

This is a block mounted to the feed throat of the injection molding machine. It has several intertwining paths through which all streams of the final LSR product are forced. This action causes all the components of the final material to be mixed prior to entering the screw portion of the molding machine.