Part/Runner Separation: Overview

• EMI Part/Runner Separators mechanically separate subgated parts (parts not attached to a runner) and are not intended to be used to break parts away from a runner.
• Each Separator is intended to be used in conjunction with or attached to an EMI belt conveyor. A typical application places the belt conveyor under the press and mold to catch the shot, then move the parts and runners out of the press and separate them into two different containers or onto additional conveyors.
• Belt conveyors with Separators may also be placed along side the press, but require a chute or underpress conveyor to transfer each shot onto the conveyor/separator.
• Best separation results are achieved when only one shot at a time is dropped onto the belt conveyor/separator. Allowing multiple shots on the belt at one time complicates separation and decreases separation rates.
• Dumping a box full of parts and runners onto the belt conveyor/separator doesn't work.

Three Factors that affect successful part/runner separation:

There must be significant size difference between the part and runner to achieve satisfactory separation rates.

Adjusting the belt conveyor and part separator speeds to the most efficient balance will have a major affect on separation rates. In many cases variable speed drive options for each unit will be recommended.

A flat belt conveyor will produce totally different separation performance from an inclined, cleated belt conveyor when handling the same parts/runners.

A Finger Separator uses gravity and size difference to separate parts from runners. Fingers must be spaced close together, but far enough apart so that the part cannot span two adjacent fingers. Parts fall through the fingers and runners are carried into a container. Removable fingers let you change position on the perforated belting. Adjustable tilt angle, belt conveyor speed, Separator speed and finger placement are all factors in effective separation.

The adjustable gap Roller Separator uses the difference in length between the part and runner to separate them. The roller is positioned to allow the part to fall through the gap. The runner is carried over the roller into a container. An optional finger belt, installed around the roller, is available.

An Auger Separator uses gravity and size difference to separate subgated parts from the sprue system. Located at the end of a belt conveyor, the Auger Separator has an adjustable gap between the auger and the stainless steel discharge chute. The sprue or the parts, whichever is larger, is carried to the side by the auger and away from the system. The smaller of the two passes under the auger and slides off the chute to a container or another conveyor.

Part/Runner Separation
Overview | Finger Style | Roller Style | Auger Style