During injection moulding, some plastic needs to be discharged in the injection tank to allow gas to escape. In most cases, these gases are just air, but they may be molten moisture or monomolecular gases. If these gases are not released, the gas will be compressed by the melt and enter the air cooler mould, which will expand and form bubbles in the product. To vent the gas before it reaches the nozzle or Air Cooler Mould(CLASSIC), reduce or reduce the screw root diameter to decompress the melt in the tank.

Here, the gas can be discharged from the holes or holes in the shooting tank. The diameter of the root of the screw is then increased and the melt of the volatiles is directed to the nozzle. An injection moulding machine equipped with this equipment is called a ventilation injection moulding machine. Above the ventilator, there should be a good smoke ejector for flammable burners to remove potentially harmful gases.

In order to obtain a high quality melt, the plastic is uniformly heated or melted and thoroughly mixed. Use the correct screws for proper melting and mixing and apply sufficient pressure (or back pressure) in the firing tank for mixing and thermal stability. Increase oil return resistance* to create back pressure in the combustion can. However, the screw takes longer to reset, so the injection moulding machine drive system will wear more. Keep back pressure as much as possible, isolated from the air, and still require the same temperature and mixing level.

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