The Barrel or Cylinder is an integral component in the processing of plastic materials. The plasticizing apparatus includes an elongated cylindrical barrel, which may be heated at various locations along its axial length, and a screw, which extends longitudinally through the barrel. The screw has a core with a helical flight thereon and the flight cooperates with the cylindrical inner surface of the barrel to define a helical valley or channel for passage of the resin to the plasticizing apparatus outlet port. The Barrel in this apparatus has to withstand high pressures and heat, and be resistant to chemical, abrasive and adhesive wear.
The barrel has evolved over the years from a carbon steel alloy that was nitrided to the modern-day tool steel and bimetallic, centrifugal casting process that are extremely wear and chemical resistant. The bimetallic barrel employs a high strength outer shell with a wear and chemical resistant lining material. The tool steel barrel, such as CPM-10V, employs a high strength outer shell with a heat treated sleeve that is press fit into the ID. Tool steel barrels are used primarily in small diameter applications where the centrifugal casting process is not physically possible to create a quality lining layer.
The barrel has adapted over the years to match the growth of thermoplastic and thermoset materials that are increasingly filled with glass and minerals. At Md Plastics we understand the resins and how they react to the metallurgy of today’s components. We can recommend the proper barrel type at a competitive price.
X802, 777 or equivalent WC Lining Alloy. Uses: Highly filled reinforced thermoplastics, Thermoset, High temperature materials, Powdered metals, Ceramics
Powdered Metallurgy Tool Steels. Uses: Small diameter equipment, Medium filled thermoplastics, Unfilled thermoplastics, Mild corrosion.
X102, 666 or equivalent, Boron-Nickel Alloy. Uses: Standard unfilled thermoplastics, Unfilled, Mild corrosion.