Telar Corp. 12995 Hawke Rd. Columbia Station, OH
Specialty Screws for Injection Molding and Extrusion
Telar offers a wide variety of specialty and custom barrier feed screw designs aimed at helping you to process today’s toughest materials. Barrier screws are designed to be more efficient melting mechanisms than single flighted Conventional or General Purpose Screws. Our BarMix high performance has helped processors achieve a 30% increase in production Our helpful support team will help in designing and building a screw to help you successfully process many of the most difficult resins including
- PVC and CPVC
- Clear Polycarbonate
- Thermoplastic Rubber
- Engineered Resins
Thermoplastic presses can be converted to thermoset. The redesigned unit incorporates a water-jacketed barrel, new thermoset screw and end cap. Easily installed, it eliminates the need for an additional press. Screws can be designed for BMC, phenolic and polyester.
BARREL: Because thermoset materials melt and cure at a very low heat, temperature control is critical. This is better accomplished utilizing a new water jacketed barrel rather than conductive heater band heat. A short barrel or L/D ratio is also recommended to reduce residence time.
SCREW: Heat can be generated by shear from standard screws. To avoid excessive shear rates, it is necessary to change the compression ratio to approximately 1.15:1.
SMEAR TIP: In phenolics, a smear tip with the proper nose angel is required. A free flow valve assembly may be used for polyester.
END CAP: Clearance between the smear tip and end cap angle is critical. Too much and the material can cure and block flow. Incorporating the end cap and nozzle as one unit is usually required.
ADDITIONAL EQUIPMENT: A support bracket may be necessary to relocate the hopper opening closer to the output end when reducing the L/D ratio.
Carbide Coating – Double the Life of Your Screw
The ultimate for high wear/ highly corrosive/high temperature applications – guaranteed results
Full Encapsulation provides the ultimate in abrasion and corrosion resistance for single and twin feedscrews. This option covers the tops of flights, flight sides and the root/core of the entire feedscrew.
Carbide coating is recommended when process very high fiberglass content, calcium carbonate, titanium dioxide, metals, ceramic or other abrasive fillers.
Screw Tip Assemblies
CPM 9V / H-13
High wear/High Abrasive resistant feed screws
Telar provides screws manufactured in high wear tool steel for your most demanding applications. Telar high wear tool steel screws are manufactured in CPM 9V a Crucible material with 9% vanadium carbide. We can also offer screws with an XC-1000 coating for extreme wear and corrosion resistance. We start with a 4140 screw substrate and then use a thermal spray weld up to .010/side of tungsten carbide coating for superior screw wear resistance.
High Performance Screws
Telar can design a screw specifically for your process to deliver peak performance. If you would like to decease cycle times, improve mixing, or reduce scrap rate then let the engineers at Telar help determine the optimal screw design. Sometimes a small change in design and/or material composition can result in significant overall screw performance.
General Purpose Screws
Telar has hundreds of screws on the shelf for immediate delivery. Our GP screws can be either nitrided or welded with Colmonoy 56 hardfacing and either chrome plated or nitrided. These screws typically have a 3:1 compression ratio and are excellent for typical molding applications. We can ship same day and with low prices these represent an outstanding value. Please check out our current list of in stock screws available for immediate shipment.
We can repairing your worn injection, extrusion or blow molding screw back to OEM specifications. After inspection we will provide you with an analysis and price quotation to repair. The repair process includes stripping the current screw, grinding and elding stainless onto the flites, applying Colmonoy 56 hardfacing for protection and then applying chrome plating if required. A rebuilt screw can be a great value as it typically can cost 50 – 75% of the price of a new screw.
Mixing Screws • Extrusion Screws • Rebuilt Screws
Feed Screw Materials
Nitralloy 135M: A tool steel machined and nitrided for 72 hours. An excellent low-cost alternative when excessive wear is not a primary consideration.
4140: A tool steel with good strength when surface threted or hard faced.
D-2: A high carbon/high chrome tool steel. Good wear resistance but low on torque strength
CPM-9V: Excellent for abrasive applications with very good wear characteristic.
Surface Treatments for Screws
Nitriding: Increases the hardness and life of tool steel screws such as 135M and 4140. Very cost effective.
Chrome Plating: Offers hardness and low friction with corrosion protection. Double and triple chrome plating often used for corrosive applications.
Carbide Coating: Guaranteed to double the life of a 9V screw.
Hard Facing – On Screw Flites
Stellite #12: Cobalt based. Recommended for resins with a low percentage of filled materials. 40-47 RC hardness.
Colmonoy #56: Nickel based. More wear resistant than Stellite. Recommended for glass-filled or resins. 50 to 55 RC hardness
Colmonoy #83: Nickel-tungsten based. Contains tungsten carbide particles for extreme wear applications. 59-64 RC.
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Telar is a leading supplier of front end components at the industries lowest prices. Huge inventory of screws, barrels, screw tips, end caps, nozzles and nozzle tips. We have inventory on many of the most popular injection molding machine makes and models. Same day shipping available on orders received by 5:00 pm EST. Rush orders 1-2 weeks.
Telar Corp. 12995 Hawke Rd. Columbia Station, OH