Service > Industry Applications

DW Machinery produces bimetallic and nitrided screw barrel sets for all applications and major makers of plastic processing equipment. Our products are found worldwide in mild to severe abrasion and corrosion wear environments.

• Alloys for the full range of polymers and process environments.
• Wear solutions from complex to general-purpose applications.
• High Performance alloys to sustain wear life and peak production.
• Custom design or manufactured to print.
• Auxiliary Components – Feed Throat Assemblies, flanges and end caps.

DW Machinery manufactures bimetallic masticating barrels and liners for all types of rubber injection molding, cold and hot feed rubber twin and single screw extrusion machinery.

• A full range of designs for all compounds and equipment.
• Wear solutions from complex to standard applications.
• High performance alloys that sustain life and peak production.
• Custom engineered or manufactured to specifications.
• Thermal jackets, auxiliary flanges and feed housings
• Vented and non-vented design.

DW Machinery manufactures custom bimetallic barrels for all types of LSR molding and extrusion applications, some include Silicone injection molding, LSR molding machines, Silicone extrusion barrels, Bimetallic barrels, and LSR molding. 

• Alloys for the full range of LSR and elastomer process environments.
• Wear solutions from complex to general-purpose applications.
• High performance alloys to sustain wear life and peak production.
• Custom design or manufactured to print.

Liquid silicone rubber (LSR) injection molding and extrusion applications have become popular in recent times. Materials such as Fluorosilicone (FLSR) are specified for gaskets, seals and parts on food equipment, medical devices, analytical instruments telecommunications and automotive parts. 

The melt blown process is a non-woven manufacturing system involving direct conversion of a polymer into continuous filaments, integrated with the conversion of the filaments into a random laid non-woven fabric.

The melt blown process involves the attenuation of the filaments using high-velocity hot air streams that impinge on the extruded filaments as they are emerged from the extrusion nozzles to obtain much finer filaments.

Melt blown Non-woven as the filter of the face masks, in recently because of the COVID-19 outbreak, the demand is increased so much. And the melt blown non-woven extruder becomes the hot sale machine besides the face mask making machine.

Various screw barrel sets with customerised design for melt blown non-woven fabric extrusion machines are available from DW Machinery.

Single and twin screw extrusion is used to process a varity of foods for human and pet consumption. Common extruded foods include sausages, processed meats, dough, pasta, cereals, snack foods, candy and animal feeds. 

There are various different equipment types and many custom designed machines. Each machine is configured for the specific application.

General types include single screw cooking, continuous pasta, dough, pelletizing extruders and co and counter rotating twin screw extruders. It is imperative to use acceptable alloys for the construction of the component surfaces that come into contact with the food materials being processed. 

Our food processing screws barrels are in various size with high durability and corrosion resistance.

We use the supreme quality raw material to manufacture food processing screw barrel. The accurate dimensions given by our highly skilled professionals, the superior finish make all our clients happy and satisfied with our delivered products.

For thermoset materials:

Thermoset materials are often reinforced with mineral and fiber fillers that create an extreme wear environment. DW Machinery recommends a barrel lined with DW-K3 tungsten carbide alloy to sustain life and productivity.

Energy transfer and accurate control of temperature zones is vital to prevent premature cross-linking of the material in the barrel. Thermal jackets positioned around the outer diameter of the barrel and arranged in two or more control zones typically control process temperatures. Barrel outer diameters are designed with OD grooves to accommodate circulating thermal fluid. Length to diameter ratios are lower than that found in thermoplastic molding. The optimum L/D depends on the machine's capacity and the material processed. Most thermoset machines have L/D ratios of 12:1 to 15:1.

For Bakelite materials:

For Bakelite injection molding, the barrel temperature is set to 70-90'C to heat (with screw shear) the raw materials flowing. The screw is only for compressing and delivering the material into the mold, without melting it. Mold is heated to a temperature (180'C, for instance) to cure the raw materials.

Screw configuration - The compression ratio of the screw for Bakelite is 1:1, and for thermoplastics, it's about 1:3 to 1:4.5.

Process - Molding of thermoplastics involve melting, but for molding of Bakelite, the fusing takes place between

particles so as no melting is involved.

Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mould cavity. The mould cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mould during the process. Most die castings are made from non-ferrous metals, specifically zinc, copper, aluminium, magnesium, lead, pewter, and tin-based alloys. Depending on the type of metal being cast, a hot- or cold-chamber machine is used.

We are specialized in manufacturing nitrided tie bars and traditional chrome plated tie bars injection molding machine and die-casting machine, together with matching guide rods, piston rods and other plastic machinery accessories.

Highly durable * Optimum performance * Low maintenance