Screws

Canterbury Engineering has the capabilities to design, manufacture or rebuild screws for a wide range of applications, including Single-Flighted, Multi-Flighted, Variable Lead, Two-Stage and Barrier. Each of these screws can be designed adding a wide variety of mixing sections. This means that we have a profile that will process your polymer with maximum output to keep you competitive. That spells World Class design.

Canterbury is known for our consistent, high-quality manufacturing system that can build screws up to 12 inches in diameter by 25 feet long in a one piece design. Larger screws can be manufactured up to a max of 24 inches in diameter or an overall weight limitation of 10,000 lbs. per section. This spells World Class manufacturing.

Rebuilding Screws with Hard Surfacing

If you have a unique request, be sure to contact Canterbury Engineering. Our staff of specialized engineers will find the ideal solution for your specific need.

  • Single-Flighted Screw
  • Multi-Flighted Screws
  • Variable Lead Screws
  • Barrier Screws
  • Multi-Section Screws
  • Single or Multiple Mixer Sections
  • Any combination of the above

Barrels

Canterbury Engineering has the capabilities to supply the perfect barrel for your screw, with tighter tolerances and proper profiling, so your extrusion process can produce the ideal in compound performance. Canterbury can supply barrels up to 12″ I.D. by 30 feet long.

cec_barrel

We offer:

  • New Manufactured Barrels
  • Barrels with Bimetallic Liners
  • Honing Barrels To Next Uniform Oversize. (Requires new or rebuilding of existing screw)
  • Relining Feed Section
  • Full Relines / Partial Relines (Partial reline in wear area Ð limited application)
  • Up Or Down Sizing Of Barrels

Common Barrel Material:

  • Bimetallic Barrels (Wear, Corrosion resistance, Wear & Corrosion resistance)
  • Nitrided Barrel (Low cost)
  • Inconel faced Barrel (High temp applications)
  • PM A11LC Barrels (High Wear)
  • Tool Steel (D2)

Corrosive Barrels

Corrosive Resistant Extrusion Barrels

Corrosive environments can significantly degrade plastic manufacturing processes and equipment. With over 35 years of engineering and industry expertise, Canterbury Engineering provides two solutions to improve performance when operating within high temperature, severely corrosive environments.

Solution #1extrusion1

Carbide Liner with Inconel Protection – For use in standard corrosive environments.

The Carbide Liner with Inconel Protection is our most cost-effective solution for improving performance within standard corrosive environments. Iron is a major contributor to corrosion from chlorine and fluoride based acids. The Carbide Liner with Inconel protection solves this problem with an extremely low iron content of less than 5%, thus, minimizing the corrosive effects of these acids.

Solution #2
BO55 Iron Free Barrel – For use in highly corrosive environments.
The BO55 is our superior solution for highly corrosive environments. With Zero Iron Content,the BO55 offers 3 to 4 times longer service life creating a strong ROI for the investment. It is the only Iron-Free liner available on the market today.

Benefits – Corrosive Resistant Barrelsextrusion2

Both the Carbide Liner with Inconel Protection and the BO55 offer great performance solutions to corrosive Fluoropolymers, food grade processing equipment, and severely corrosive plasticizing environments. With low iron and iron free content, both screw and barrel assemblies provide strong benefits.

  • Superior Performance in corrosive or abrasive environments.
  • Resistant to Corrosion from attack by corrosive acids found in Fluoropolymers processing.
  • FDA Recognized and Approved as suitable bore materials for processing plastics in food, medical and pharmaceutical applications.
  • Compatibility – Compatible with many screw flight hard facing materials and metal constructions. The majority of the time it is mated with corrosion resistant base metals – XC4000 coated or C56 hard face Inconel or other high nickel alloy.
  • Added Inconel Protection – Inconel cladding can be included to critical cylinder surfaces that are not protected by corrosion resistant inlay. In most applications, Inconel protection is typically required on the discharge end of the barrel; however, we add Inconel cladding on other unprotected surfaces if requested.
  • Complete Barrel Assemblies & Liners – BO55 & Carbide Liner with Inconel Protection  are available in complete barrel assemblies and liners.

Carbide Liner with Inconel Protection for Standard Corrosive Resistance

The Carbide Liner with Inconel Protection is designed for standard corrosion-resistant environments working with mildly corrosive resins. It is our most cost effective solution to improve performance within corrosive environments.

  • Less Than 1% Iron – This spun-cast inlay typically has less than 1% iron in the base chemistry and is similar to other bore inlays offered in the marketplace as “corrosion-resistant”.
  • Provides Moderate Corrosion Resistance for Processing Fluoropolymers – This inlay provides moderate corrosion resistance for processing highly corrosive Fluoropolymers because of its tendency to absorb even the very small amount of iron from the backing material. It is also somewhat lower corrosion resistance compared to the corrosion-resistance level of BO55 inlay (optimal solution).

extrusion3

BO55 for Severe Corrosive Resistant

The BO55 Barrel Liner is our best corrosion-resistant barrel inlay offering superior performance in severe applications. It is designed to operate in severe, highly corrosive environments and protects against attack from acids produced in the processing of Fluoropolymers. B055 results in 3 to 4 Times Longer Service Life compared against other corrosion resistant barrels.

Major features and benefits of B055 are:

  • No Iron Content – Iron is a major contributor to corrosion from chlorine and fluoride based acids. BO55 bimetallic liners are made using a low temperature Hot Isostatic Pressing, “Hipping” (HIP), process that allows for an iron free liner with no porosity. The HIP process prevents changes to the inlay chemistry by not absorbing any corrosion inducing chemicals typically present in the backing material. Other inlays on the market offered for processing Fluoropolymers may contain iron or are spun-cast into the cylinder and thus may absorb iron found in the backing material. Absorbed iron will make these cylinders less corrosion-resistant over a relatively short time period.
  • High Temperature Hardness – B055 is a nickel-rich, boron-base alloy with high contents of molybdenum, chrome, and is nickel enriched with complex borides and carbides. This chemistry allows B055 to maintain high temperature hardness above Rockwell C 50 at 700 degrees Fahrenheit.
  • Superior Corrosion Resistance – High Molybdenum contents and other alloying elements mentioned above are superior in corrosion resistance against halogen containing elements. This reduces the acid attack on the liner as compared with conventional nickel-cobalt liners made by competing manufacturers.

Which Solution is Right for You?cr_extrusion_barrels_4

Which solution will offer the best value for your specific environment? Contact one of our Engineers today for a Free Consultation about how our corrosive resistant solutions can improve the efficiency of your operation.

Experience the Canterbury difference that our years of knowledge and expertise can make in your operation.