Service > Technical Support

As a leading supplier of Injection, Blow Molding and Extruder screw barrel sets, DW Machinery has accumulated a large database of prints, drawings, and factory OEM specifications through these years manufacturing.

We design general-purpose screw barrel sets with the flexibility to run a wide variety of materials, as well as design and consult a custom screw to match your material needs. These designs incorporate mixing, improved output, low shear designs for heat sensitive plastics, venting, up-sizing and down-sizing injection units.

DW Machinery continues to improve Quality Control System through precise inspection during every step of the production. With our excellent quality, we have already established long term cooperation with many well-known companies both in domestic and overseas. We are one of the first companies to implement the ISO9001 & SGS Certification in our field.

Barrel: Repair Through A Larger Inner Diameter

When a barrel, both bimetallic or nitrided, is worn out can be repaired by boring a larger inner diameter.

Barrel: Repair Through Inside Bushing

In special cases, a barrel can be repaired by fitting in the worn area an inside bushing.The bushing can be made of nitrided steel, hardened steel but also of bimetallic alloy.

Screw: Flight Top Welding

For screws with diameters larger than about 60 mm, may be convenient, depending on the type of wear, to restore them by welding new material on the top of wornout flights. 

For barrels

The bimetallic alloys are produced in modern sophisticated centrifugal casting facilities.

At this stage, we have DW-K-1, DW-K-2 and DW-K-3 alloy types and treatments for wear fighting. 

Please refer to the page for more details: Products -> Bimetallic Barrel

For screws

We offer different materials types and treatments to fight wear. The materials range from nitriding steels, stainless steels, tool steels up to steels produced by powder technology (PM).

At this stage, we have DW-S1, DW-S2 and DW-S3 alloy types and treatments for wear fighting.

Please refer to the page for more details: Products -> Bimetallic Screw

Our on-site inspection services include but not limited to the following:

Preventive Maintenance inspections/services.

Extruder installations, change outs, rigging, leveling and assembly.

Extruder trouble shooting and maintenance.

Extruders checked out mechanically and electrically.

New control cabinets and panels per your requirements.

Extruders rebuilt and modified.

Gearcase (box) rebuilding. Gear ratio changes.

New improved cooling systems. Reline feed sections.

Drives, motors and heaters, replaced and repaired.

Cooling and heating state-of-the-art conversions, water to air.

Inefficient air systems upgraded.

Reduce operating costs, energy costs, easier access to heaters, T/Cs .

Reduce down time.

Extend operating life, improved barrel temperature control.