Injection Mould Types

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Injection Mould Types

Plastic injection moulds can be categorized into two main types: cold runner mould and hot runner mould. A runner is the channel in the mold that conveys the melted plastic from the barrel of the injection molding machine to the part.

Cold Runner Mould

In a cold runner mould, the runner is cooled and ejected with the part. Every cycle, a part and a runner are produced. The obvious disadvantage of this system is the waste plastic generated. The runners are either disposed of, or reground and reprocessed with the original material. This adds a step in the manufacturing process. Also, regrind will increase variation in the injection molding process, and could decrease the plastic's mechanical properties.

Hot Runner Mould

In a hot runner mould, the runner is situated internally in the mould and kept a temperature above the melting point of the plastic. Runner scrap is reduced or eliminated. The major disadvantages of a hot runner are that it is much more expensive than a cold runner, it requires costly maintenance, and requires more skill to operate. Color changes with hot runner moulds can be difficult, since it is virtually impossible to remove all of the plastic from an internal runner system.

Hot runners have many advantages. They can completely eliminate runner scrap, so there are no runners to sort from the parts, and no runners to throw away or regrind and remix into the original material. Hot runners are popular in high production parts, especially with a lot of cavities.

Types of Cold Runner Moulds

There are two major types of cold runner molds: two plate and three plate.

A two plate cold runner mould is the simplest type of mould. It is called a two plate mold because there is one parting plane, and the mould splits into two halves. The runner system must be located on this parting plane; thus the part can only be gated on its perimeter. A three plate mould differs from a two plate in that it has two parting planes, and the mould splits into three sections every time the part is ejected. Since the mold has two parting planes, the runner system can be located on one, and the part on the other. Three plate moulds are used because of their flexibility in gating location. A part can be gated virtually anywhere along its surface.

Types of Hot Runner Moulds

Hot runner molds are two plate moulds with a heated runner system inside one half of the mould. A hot runner system is divided into two parts: the manifold and the drops. The manifold has channels that convey the plastic on a single plane, parallel to the parting line, to a point above the cavity. The drops, situated perpendicular to the manifold, convey the plastic from the manifold to the part.

There are many variations of hot runner systems. Generally, hot runner systems are designated by how the plastic is heated. There are internally and externally heated drops and manifolds.

Externally heated hot runner channels have the lowest pressure drop of any runner system (because there is no heater obstructing flow and all the plastic is molten), and they are better for color changes none of the plastic in the runner system freezes. There are no places for material to hang up and degrade, so externally heated systems are good for thermally sensitive materials.

Internally heated runner systems require higher moulding pressures, and color changes are very difficult. There are many places for material to hang up and degrade, so thermally sensitive materials should not be used. Internally heated drops offer better gate tip control. Internally heated systems also better separate runner heat from the mould because an insulating frozen layer is formed against the steel wall on the inside of the flow channels.

A special type of hot runner system is an insulated runner. An insulated runner is not heated; the runner channels are extremely thick and stay molten during constant cycling. This system is very inexpensive, and offers the flexible gating advantages of other hot runners and the elimination of gates without the added cost of the manifold and drops of a heated hot runner system. Color changes are very easy. Unfortunately, these runner systems offer no control, and only commodity plastics like PP and PE can be used. If the mold stops cycling for some reason, the runner system will freeze and the mould has to be split to remove it. Insulated runners are usually used to make low tolerance parts like cups.

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