CF ChatterFix
Preventive Maintenance

Granulator Blade & Screen Service

Dull granulator knives generate fines and dust instead of clean regrind. Fines change the bulk density feeding the throat, which destabilises the process, and excessive heat from dull blades degrades the material before it is even remelted.

Interval Monthly
Est. Duration 1.5 hrs
Steps 4
Applies To Plastics & Injection Molding

The Procedure

The steps ChatterFix schedules for this PM. Every step is a checkable item on the work order — a technician can speak their way through it without touching a keyboard.

  1. LOTO and confirm rotor is at rest before opening
  2. Inspect rotor and bed knives; rotate or replace when dull
  3. Set knife gap to the OEM specification
  4. Inspect screen for wear and blinding; clean or replace

Why This PM Exists

Dull granulator knives generate fines and dust instead of clean regrind. Fines change the bulk density feeding the throat, which destabilises the process, and excessive heat from dull blades degrades the material before it is even remelted.

What Skipping It Looks Like

Inconsistent regrind quality that shows up as process variation on the press, higher motor load, and eventually rotor damage.

Setting the interval

Monthly inspection with knife gap set to spec at every blade change. Abrasive and filled materials dull knives much faster.

Equipment This Covers

Common Questions

How often should this PM run?
Monthly. Monthly inspection with knife gap set to spec at every blade change. Abrasive and filled materials dull knives much faster.
How long does it take?
Budget about 1.5 hours for a technician working to the standard procedure. ChatterFix uses that estimate for capacity planning, then learns your plant's actual time from completed work orders.
What happens if we skip it?
Inconsistent regrind quality that shows up as process variation on the press, higher motor load, and eventually rotor damage.
Can I use this checklist in ChatterFix?
Yes — this exact procedure ships in the Plastics & Injection Molding industry pack. Pick your industry at signup and it is scheduled on the right assets automatically, with no configuration.

Related Procedures

Stop Retyping Your PM Library

This procedure — and every other PM for your industry — is already built into ChatterFix. Pick your industry and it lands on the right equipment, on the right interval, in about three minutes.