TIPS FOR LONGER LIFE OF SCREWS / BARRELS & BETTER PRODUCTION:
If below simple tips are followed, we assure you can get great value for your screws, barrels and your machine.
- Always Understand The Exact Input Polymer Other Additives To Be Processed Before Selecting Screw Barrel. For Scrap / Regrind /Ca Co3 More Than 25 %; Bimetallic Screws Are Recommended.
- Always Insist On Drawing Of The Screw Barrel, Nose Cone, Head Grooved Feed Bush Etc. While Purchasing A Machine From The Manufacturer. If You Do Not Get Drawings, Make Drawings With The Help Of A Draughtsman Or Engineer For Your Reference.
- Always Keep Spare Screw Barrel With You For Any Emergency Situation.
- Never Run The Screw Barrel Without Loading Any Polymer, Never Run Screw Barrel In Cold Condition.
- Always Filter The Material Before Loading Into The Hopper To Remove Any Hard Material Like Stone Or Metal To Enter The Screw Barrel Damage It.
- Increasing The Diameter Of Old Screws Barrel Does Increase The Production In Most Cases.
- Introducing Barrier Section In The Screw Does Increase The Production, But Will Draw More Current; Hence Gearbox Motor Should Be Able To Take The Excess Load.
- Most Grades Of Bimetallic Screws Can Be Used With A Gas Nitrided Barrel.
- Avoid Making Drastic Design Changes In The Screw Barrel.
- Do Not Increase Rpm Of The Screw Than The Recommended Speed By The Manufacturer Of Your Machine.
- Keep Good Relations With The Machine Manufacturer.
- Preheat Treatment (Hardening Tempering) Is A Must On The Raw Material To Ensure The Strong Core Of The Screw And Barrel.
- It Is Advisable To Re-Nitride The Screw Barrel At A Regular Interval Of About 10 Months Of Working. (Especially In Twin Screws Barrel)
- Repairing Of Screw Barrel Is Possible; Only Up To A Certain Limit.
- A Repaired Barrel Is Equivalent To A New Barrel. New Screw Is Recommended Along With The Barrel. The Clearance Between Screw Barrel Should Be 0.2mm In Case Of Extruders Blow Moulding And 0.15mm In Case Of Injection Moulding Machines.