Analysis of the Use of DCT on Pelletizer Blades at a Rubbermaid Plant

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

Cost Comparison | Treated vs. Non-Treated Knives

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


  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

Untreated blade cost - Copy.png
Cryogenic Treatment benefits peletizer blades and screens.
Cryogenic Processing benefits calculations
Cryogenic Processing benefits calculations




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 +1-847-651-5511.