Valve Actuation System

A mechanical valve gate actuation system from Technoject Machinery (Bolton, ON) makes it possible to have an accurate and reproducible opening and closing of the injection gate.

A mechanical valve gate actuation system from Technoject Machinery (Bolton, ON) makes it possible to have an accurate and reproducible opening and closing of the injection gate. Two mold components interlink diagonally and implement the needle movement and the actuating bar moves the needle unit. This needle unit consists of an actuating bar, which is firmly connected with the valve gate needle. Each needle can be adjusted individually in length. In addition, one drive unit can actuate several needles. If necessary very small cavity distances can be realized with this modular design. Normally, the drive, the actuating bar and the needle are aligned in a row; however, offset or at 90¡ã to each other is possible as well. Also, the actuating bars can be positioned at almost any arbitrary angle to each other. This could allow the needle to be placed on an angle also. It is even possible with multi-cavity tools to arrange the needles at different angles. The new diagonal drive can be operated with both a hydraulic or a pneumatic cylinder, or with an electric motor. As a standard the cylinder is mounted on one of the sides, but if requested can also be positioned at the top or bottom of the mold. If the drive is operated with a stepper motor, the needle movement can be actuated in such a way that a soft, final closing into the sealing area is made possible.