Screw barrel

Screws and barrels for injection molding machine: With the fast developing of injection machine, both the screw rotation speed and the pressure in the barrel are increased, Also with the very fast speed research and development of engineering plastic and modified plasic,the ordinary screw and barrel made of nitriding steel cant meet the requirement of abrasion, corrosion and high temperature.Based on the actual requirement Jnha Factory has developed and introduced the materials which are fit for the modern plastic processing.And these materials have a lot of advantages,such as high precision,high hardness and high wear resistant and anticorrosion,Raw materials of Jnha Factory include alloy steel,stainless steel and CPM tool steels,The grades of materials are listed in the following chart,their properties and the relative documents applied are summarized material Yield ForceMPAEffective hardnessTreatment ModeSurface Wear ResistanceBottom Layer ResistanceAnticorrosionAlloy SteelJIS SACM645(38CrMoALA)89056-62RcNitridingGoodBadBadAISI4140 (42CrMo)68948-56RcQuench OkBadBadAISI 434075848-56RcQuenchOkBadBadNITRALLOY 135M58660-70RcQuenchGoodGoodBadTool SteelsD-2206858-60RcQuenchGoodGoodBadCPM-9V/V4196552-55RcQuenchGoodGoodOkVPM-590/V102241156-59RcQuenchGoodGoodGoodStainless Steel30424148-56RcQuench-AlloyGoodBadGood31624148-56RcQuench-AlloyGoodBadGood41679356-60RcQuench-AlloyGoodBadGood Mixing screw is a low shearing speed screw for mixing. Melting is carried out at a low temperature differential range. It is suitable for the materials when color master batch, additives, and glass fiber materials are contained. By using this kind of screw, heating tem- perature can be decreased, and plasticization speed is fastened. High extrusion output can be achieved at a comparatively low temperature and cooling time of mould is shortened. Barrier-type screwis the best choice to use barrier type screw when the high plasticization and high shearing resisting materials are required.