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Screw and barrel

Screw and barrel are the basic elements of extrusion screw machine meant for  heating and plastication of material and portage of fusion under pressure in an extrusion head. The construction of screws depends on the type of machine (single-screw or twin-screw) and  thermophysical properties of material.


For single-screw machines we offer ordinary standard three-zone screws, screws with mixer elements or extended fivezone screws with the zone of degassing.

Specification : Diameter: 15-300mm. Max. length: ≤ 10000mm

  1. Material: 38CrMoAI a nitriding treatment, surface hardness: HV≥900, nitriding depth: 0.5-0.8mm.
  2. Material of barrel inside layer : Tungsten alloy surface spraying, prolong life of screw.

Screws of twin-screw machines have more elaborate design, hooking conical or parallel screws revolved in opposite directions are mostly used.

 
  1. Material: 38CrMoAIA a nitriding treatment, surface hardness: HV≥900, nitriding depth: 0.5-0.8mm.
  2. Base material: 38CrMoAIA,  special alloy is welded on the flight of screw, prolong life of screw.
  3. Easy wearing parts of barrel made from anti-wear alloy can be improved abrasion performance.

A construction and sizes of screws for plastic injection machines substantially depend on physical and chemical properties of the processed polymeric materials and features of their fusions. In this connection distinguish three groups of screws. First - intended for processing of crystallizable and amorphous thermoplasts, second - for thermoplasts crystalline with an enhanceable temperature and short period of melting, third group- for thermoplasts with a subzero thermostability and propensity to destruction.

 

Screw for injection molding machine

 
 
  1. Material: 38CrMoAIA a nitriding treatment, surface hardness: HV≥900, nitriding depth: 0.5-0.8mm.
  2. Material : special stainless steel Quenching treatment, hardness : HRC 55-58. Suitable for the screw which is used for transparent plastic products and high corrosion plastic processing, prolong life of screw.
   3. Material : Tungsten alloy. Surface spraying, improve abrasion performance of screw.
 

 Barrel for injection molding machines

 
  1. Material: 38CrMoAIA a nitriding treatment, surface hardness: HV≥900, nitriding depth: 0.5-0.8mm.
  2. Material of barrel inside layer : Tungsten carbide alloy. Centrifugal casting, prolong life of barrel.
 
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