Extruder Screw Repair
With over 40 years experience in extrusion machinery, Mitchell precision is the world leader for extruder screws & barrel repair. From cleaning and polishing to chrome or nitride coatings to complete extruder screw repairs, we can get you back into production faster than any of our competitors with cheaper pricing and a stronger warranty. We are a turnkey extruder screw repair shop. While other shops subcontract the chrome plating or side grinding, we do it all under one roof. No subcontractors means faster delivery with cheaper prices.
Does your extruder need complete repair or rebuilding? Maybe just cleaning, polishing or plating. We deliver your extruder repair on your schedule. Extruder cleaning and polishing with minor repairs can be done in 24/48 hours.
What will my extruder repair cost? Call us with the make & model of your extruder that needs repair. Let us know how many flights and the OD with the overall length. Is there damage to root diameter like pits or scars? Give us as much detail on your extruder repair as possible and our tech will give you an estimate right over the phone and follow up with an email & fax.
All of our extruder screw repairs are done to exceed OEM specs, tolerances & guidelines for plating thickness, overall polish finish, hardness, etc. Your extrusion screw repair will last longer while performing better with a longer warranty.
How long will my extruder repair take? Normal delivery time is 8 to 14. Depending on the amount of damage to root diameter and whether it has a mixer, typical delivery time is under two weeks. Diameter, length and amount of plastic can determine delivery time. Expedite service, 3 shifts, weekends and holidays are always available.
Does extruder repair come with a warranty? Yes, 12 months from the install date. We offer the best warranty in the industry because we exceed all OEM specs/tolerances for size, strength, chrome thickness, polish finish, etc. Our warranty covers the chrome/nickel/nitride coating, the hardfacing on the flights, polish finish and all labor. No other extruder repair company can compare to the workmanship, quality or warranty of Mitchell Precision.
Typical extruder repair process:
1: Complete cleaning and stripping of all chrome or nitride coatings to prep for inspection and measurements to check how much work your extruder repair needs.
2: Measure OD of each individual flight to determine the amount of wear and inspect root diameter.
3: Precision OD grind all hard facing off for fresh layer of material and prep your extruder screw for repair.
4: Repair root diameter and blend in. No pits, zits, pin holes, your root diameter will be absolute perfection. We apply a 8RMS finish to the root at this stage.
5: Apply Hastalloy, C56 or other hard facing (5 different materials available) to the OD of all flights, building up passed original size.
6: Precision side grind excess welding from flights (flight trimming). Basically trim the excess hard facing from your extruder screw flights. Check with dye penetrant to check for any cracks, pin holes, etc. Repair as needed.
7: Mirror finish polish the entire screw to a 6RMS finish and prep for plating or nitride coating.
8: We can either hard chrome plate, electroless nickel plate or coat with nitride your entire screw and buff to a 4/5RMS mirror finish. Military Spec QQC-320B & Military Spec Mil-C-26074B Class A Grade 1. For harsh environments or for the longest lasting exterior coating we recommend CEB coating. Chrome over Electroless nickel, Baked at 475 for 3 to 5 hours. We’ll give a 2 year warranty on all CEB coatings against any pitting, chipping, burning, etc.
9: Precision OD grind the flights to your exact size.
10: Extruder repair is practically completed. We inspect all sizes, straightness, root diameter and prepare for final buffing and polishing.
11: Final inspection of all sizes and tolerances, final buffing to mirror finish. Crating and foam insulation with metal banding and prep to ship to your dock.
The end result is an extruder screw repair that will exceed OEM spec/tolerances and will perform like new. Fully guaranteed for one full year. Delivered in half the time of our competitors. We exceed OEM specs/tolerances for polish finish, strength of hard facing overlay, straightness, TIR, plating thickness, etc. We deliver an extruder repair that will out perform a new extruder with a better warranty and a lower price.
We either rebuild your extruder to exact size or make it oversize to fit your current barrel. If it is built to size, your extruder repair is fully interchangeable with any barrel. If it's built to a specific size, it's basically married to that barrel until the next rebuild. If your extrusion barrel is honed oversize to 100% cleanup, we can rebuild your extruder to match that dimension. You’re saving a lot of money by bypassing a barrel relining procedure which can cost thousands and take weeks. The down side is the extruder and barrel are married and cannot be interchanged until the next repair cycle.
Please click the links and feel free to call us with any questions. You'll speak directly to a extrusion technician who can give you an estimate on cost right over the phone. Nationwide same day pickup is available on any size project!
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