PET recycling knives intervene in a decisive stage: transforming prepared containers into a flake that can be washed, separated and processed regularly. Quality is not measured only by average size. Fines, the presence of large particles, and the stability of the material between batches also matter.
Prepare the flow before granulating
The prior separation of materials other than PET and the management of labels and closures are part of the line design. A blade does not correct insufficient grading. Document composition, dirt and inlet moisture. If suppliers or pickups change, compare samples before changing settings. This way you will avoid confusing a change of raw material with a mill failure.
Clean cutting and material evacuation
Jointly check edge, bedknife, screen and discharge. A clogged screen can retain material and increase recirculation. A worn cutting assembly can affect uniformity. Herbold documents wet granulation as an option in plastic recycling; Its suitability depends on the entire process and whether the equipment is designed to work with water.
What to control in the scale
Take comparable samples at a fixed point and record the size distribution using your plant’s control method. Separate the useful production from the rejects and check the subsequent behavior in washing and drying. Gross mill output can be misleading if a significant portion ends up being recirculated. Also record the cleaning frequency and discharge incidents.
Select spare parts with verifiable information
Rotor and stator blades, screens and fasteners must be identified by the equipment and its configuration. Provide a reference, a plan if it exists, measurements of a piece in good condition and assembly photos. Do not deduce the nominal dimension from a very worn cutting edge. To plan replacements, keep a history of the assembled assembly and work hours.
Frequently asked question
Can all bottles be processed together?
Acceptability depends on the sorting scheme and recycling requirements. Polymer identification and contamination must be resolved before adjusting the cut.
Documentation and related reading
Technical reference: Herbold: wet granulation in recycling. The practical observations in this guide must be compared with the documentation of the installed equipment.
Expand information with our related technical guide and consult the Sharp industrial spare parts.
Consult a blade or spare part
Send us your query with brand, model, reference and photographs to study the piece and prepare a quote. For tools in service, also see tool options. sharpening and repair.