Modes of Operation

Injection moulding machines operate in the following modes:

(i) Manual
(ii) Semi-automatic
(iii) Automatic
(iv) Set-up

(i) Manual Mode

The manual mode is used for machine set-up. You can perform the following functions in this mode:

· Clamp open and close
· Ejector stroke
· Material and color changes
· Screw rotation

(ii) Semi-Automatic Mode

In the semi-automatic mode, the machine makes one complete cycle. This mode provides an indication as to how the machine will perform in the automatic mode. This mode is used when an operator is required to remove the parts from the mould. In this mode you can also add inserts so that they can be moulded into the part.



Adjustments can be performed to the following elements to improve processing:
· Clamp stroke
· Mould open time
· Injection pressure
· Injection speed

(iii) Automatic Mode

The automatic mode allows the machine to run continuously without interruptions. You make final adjustments to the mould and pressure controls once the machine begins the automatic cycle. Fine tuning of the process will result in producing high-quality parts with few rejects.

(iv) Set-Up Mode

Usually maintenance or set up personnel use this machine mode for mould set-up. During the set-up mode, the machine operates at a very slow speed when the top gate is open. The clamp will operate from left to right when the front and back gates are closed. Some machines allow you to keep the front gate open and at the same time open the mould. You can make fine adjustments to the clamp positioning in the set-up mode.