Plastic recycling granulator need to remove the gas from the melt in the extrusion process.
Plastic recycling granulator need to remove the gas from the melt in the extrusion process. The product surface or internal may be holes, bubbles and other defects when the gas can not stay out.It seriously affects the physical and mechanical properties of products, chemical properties and electrical properties.We can set up 1-2 exhaust ports between the feeder part and the extruder head .It can remove water and other ingredients volatile in the molten extruded material.But the steel cylinder opening often have some problems，such as:material leakage ouside the exhaust port.A small amount of material leakage will affect the discharge of water, which can affect the quality of products;a large number of material leakage will Plug the exhaust port,which lead to downtime.
There are two reasons result in the material leakage ouside the exhaust port.Firstly,the unreasonable screw design lead to the material leakage at the exhaust port.Secondly, the unreasonable exhaust port design, the molten material often was "caught" through the exhaust port.There are fllowing two solution to solve in problms:1:Screw uses multi-stage design.Material will not flow out at the atmospheric pressure.2:Change the size of the exhaust port to meet the normal expansion of the melt.For example,if the rolling stream expands 5 to 10 mm,so the depth of the exhaust port should be at least 5 to 10 mm.
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