When choosing an injection molding barrel screw, there […]
When choosing an injection molding barrel screw, there are several considerations to consider. First, the feedthroat temperature must be adequate. Too cold and volatiles will condense inside the barrel. Too hot, and a melt film will form between the flight and the barrel wall. Trapped air can also cause splay or bubbles in parts. The proper feedthroat temperature can minimize these problems. If these factors are not addressed, your parts can fail.
The injection molding barrel screws are designed for use in all plastic processing machines. These precision-engineered screws are designed with a locking design for quicker and more consistent shut off. These screws feature a locking ring with a consistent position for the tip of the screw on every rotation. The screw is designed to mix the molten plastic before it is directed to the mold.
A PM-alloy screw offers excellent wear resistance over conventional tool steels. It is available in a variety of materials, including stainless steel and titanium. PM-alloy screws are ideal for injection molding applications because of their superior wear resistance.
As the diameter of the screw increases, the screw design becomes more important. Its shape and metallurgy will have a greater impact on the melt process than the heater bands and other parts. Small screw diameters require a different material mix and metallurgy. Therefore, the screw and barrel ratio should be based on material properties, screw design, and metallurgy.
The injection molding-barrel screw is a versatile tool for plastics and metals processing. The barrel screw diameters and length are key factors in the overall quality of the plastic part. The size of the barrel should be appropriate for the production capacity. A larger diameter will produce a higher quality product. Injection-molding barrel screw will ensure a consistent melt temperature in the end.