The Power of Proper Polishing
A polished punch cup surface ensures tablets release cleanly and prevents residue build-up, supporting consistent output and reduced downtime. Buffing with an unsewn cotton wheel is a highly effective method, restoring both the shine and structural integrity of punch cups—especially by eliminating “J-hook” wear. In severe cases, utilizing a 400-grit stone to restore the punch land can extend tooling life by up to 80%.
Buffing vs. Drag Finishing
While drag finishing offers a convenient, semi-automated approach for polishing the entire punch, it often fails to restore crucial land features needed to avoid capping and other defects. Overuse of drag finishing can inadvertently damage tooling, causing cam track wear and poor tablet release. In contrast, manual buffing excels at restoring punch cup land, reinforcing the cup’s shape, and ensuring higher tablet quality over time.
Importance of Technician Training
Unskilled polishing can reduce tool life and compromise batch consistency. Well-trained technicians understand optimal pressure, timing, and the necessity for refurbishment. Implementing a standard operating procedure (SOP) based on punch condition—rather than rigid production cycles—maximizes both performance and longevity.
When to Refurbish Tablet Punches
Consider punch refurbishment when:
- Punch cups appear dull or have visible nicks
- Tablets display defects such as sticking, capping, or discoloration
- After high-volume runs or processing abrasive materials
On-site punch refurbishment, when performed by qualified staff using proper equipment, minimizes cost, downtime, and ensures durable tablet quality.
