Vertical Injection Molding

Vertical injection molding machine is a mechanical equipment. It is usually composed of injection system, clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc..

Injection system is one of the most important parts of injection molding machine. There are 3 main forms: plunger type, screw type, screw pre plastic plunger injection type. Screw type is the most widely used at present. It is, in a circular plastic injection machine, within a specified time will be a certain number of plastic heating plasticization, pressure and velocity in the screw, through the molten plastic is injected into the mold cavity.

Vertical Injection Molding vs. Horizontal Injection Molding

Most of plastic injection molding machines are horizontal, however, there are also some vertical injection molding machines. The difference is that: for the horizontal injection molding machine, the molds should be put onto the machine horizontally, with left half and right half; for the vertical injection molding machine the molds should be put onto the machine vertically, with top half and bottom half.

A vertical injection moulding machine is a horizontal injection moulding machine that has been turned on its end. Turning it to stand upright can be for space saving reasons. But it is also useful in insert moulding with tool change and positioning inserts.

Vertical Injection Molding Operation

Injection molding machine molds can be fastened in either a horizontal or vertical position. The majority of machines are horizontally oriented, but vertical machines are used in some niche applications such as insert molding, allowing the machine to take advantage of gravity. Some vertical machines also do not require the mold to be fastened. There are many ways to fasten the tools to the platens, the most common being manual clamps (both halves are bolted to the platens); however, hydraulic clamps (chocks are used to hold the tool in place) and magnetic clamps are also used. The magnetic and hydraulic clamps are used where fast tool changes are required.

The person designing the mold chooses whether the mold uses a cold runner system or a hot runner system to carry the plastic and fillers from the injection unit to the cavities. A cold runner is a simple channel carved into the mold. The plastic that fills the cold runner cools as the part cools and is then ejected with the part as a sprue. A hot runner system is more complicated, often using cartridge heaters to keep the plastic in the runners hot as the part cools. After the part is ejected, the plastic remaining in a hot runner is injected into the next part.

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