Rubbermaid Pelletizer Blades Case Study

We worked closely with a plant manager at the Rubbermaid Corporation to find out how the costs of deep cryogenically treated pelletizer blades stood up to the costs of untreated pelletizer blades. Our experiment and calculations are based on the parameters we extracted from this trial.

Cost Comparison | Treated vs. Non-Treated

We compared the costs of a set of cryogenically treated knives and untreated knives for a Nelmore grinder. The blades are D2 steel. Results and processing costs may vary with the type of plastic, blade size, and number.

Data:

  1. Rubbermaid told us that untreated blades wear out after three months of service.
  2. Rubbermaid told us that cryogenically treated blades wear out in 24 months.
  3. The blade set costs $750.
  4. Labor to change blades is 4 hours.
  5. Cost to sharpen a set of blades is $100.00.
  6. Untreated blade sets can be sharpened ten times.
  7. Cryogenic processing of the blade set costs $500.
  8. Labor charge out costs is $50.00
  9. Time basis for the calculation is one year.

The total cost of using the blades:

  1. The cost of the set(s) used minus any residual value at the end of the year
  2. Sharpening costs
  3. Labor costs

 

Blade Cost Calculations

Yearly Cost of Sharpening

Labor Costs for Changing the Blade

Conclusion

Total Savings

The money saved by using cryogenic processing was $1216 per year /per grinder.

With over 65 grinders in one plastic molding plant, potential savings is over $79,000 per year. The money invested in processing the blades is returned in less than six months. More savings are available if the screens are processed.

Contact Controlled Thermal Processing Today

If you want to improve the bottom line of your business by reaping the benefits of deep cryogenic processing for industrial and mechanical parts, or if you’re interested in metallurgy consulting or purchasing your own cryogenic processing equipment, reach out to the cryogenic specialists at CTP by contacting us online or calling us at +1 (818)-445-3030.