Screws

Screw ProcessOptimal processing depends on the feedscrew design and quality of the feedscrew. It cannot be overstated that this key component is critical to success. Our designers, engineers and machinists understand what it takes to design and manufacture screws that perform.

TOOL STEEL EXPERTS

Small Feed ScrewNobody knows through hardened tool steel screws better than Concor Tool. Concor pioneered the use of Crucible’s CPM materials in the 1980’s. PM-alloy screws exhibit excellent wear resistance over conventional tool steels. We have used a host of other tool steel materials including European steels, always exploring the best applications. Critical to the research is the ability to rebuild those materials. Concor has been rebuilding CPM 9V screw since 1992 – something unheard of in the Plastics Industry.

DESIGN

Optimizing performance improves processing and will extending the life of the screw and the barrel. Improved output, better mixing, and critical melt quality can all be achieved through proper screw design. Crystaline and amprphus material process differently so the designs are different for each. See article.  Different barrier designs and various mixers are made use of to achieve desired outcomes. See design article.  For more information on screw design, see our “Engineering and Design page” or view our various mixing screw designs.

Duracon Feed Screw by Concor Tool and MachineDuracon design: The Duracon screw is designed to be the most durable screw available, combining innovative geometry, dimension, and alloy type to extend wear life of the screw and barrel. Key design elements optimize the Duracon screw for running in a very wide range of processing environments and a broad range of resin types. Incorporating unique flight geometry with forgiving feed and transition sections, the Duracon screw will significantly increase the wear life, extending the high part quality production cycle.


Screw group shotSolidStar design: The SolidStar solids conveying screw is Concor Tool’s answer to the toughest abrasive wear issues facing molders today. The Solidstar has been proven to extend screw life from days to months and from months to years. The SolidStar patented profile geometry is the key to competitive, successful molding of all of the super abrasive fillers including silica, carbide, metal and mineral materials. All of this priced comparable to any standard through hardened tool steel screw. Concor Tool quality, thirty plus years of innovative feedscrew design and component base metal research came together to create the SolidStar.

MATERIALS

Common Screw Materials Chart

HARDSURFACING

Common Hardsufacing Materials Chart

COATINGS AND TREATMENTS

Screw Coatings
Chrome plating and ion nitriding are the most common screw surface treatments. TiN coating and nickel plating are sometimes used but only in special applications. Carbide coating of the flight tops or encaplulation of the entire flighted length can add additional wear protection. The carbide can be applied in different thicknesses and be polished to different RMS finishes depending on customer requirements. Each combination has a different price structure. The thickness of the carbide can be up to .010/side.

Concor’s quality standards exceed the SPI standards. Our mission has always been to provide our customer’s with screws that meet and beat the demands of ever challenging product requirements.