Cutting Chamber The main section of a shredder or granulator where materials are fed and cut by rotating blades or knives.
Rotor A rotating component in shredders and granulators equipped with blades that shred or granulate materials as it spins.
Fixed Blade A stationary knife in the cutting chamber that works with the rotor blades to slice through materials.
Screen A perforated metal sheet under the cutting chamber that determines the size of the output particles by allowing only appropriately sized pieces to pass through.
Hopper The top opening of a shredder or granulator where materials are fed into the machine for processing.
Shaft The central axle in a shredder or granulator that holds and rotates the cutting blades or tools. Machines may have single or multiple shafts for different applications.
Drive System The mechanism that powers the machine, typically including an electric motor or hydraulic system that drives the rotor or shafts.
Feed Rollers Mechanized rollers that grip and push materials into the cutting chamber, ensuring consistent feeding in shredders.
Grates Replaceable screens or bars that control the size of the material exiting the shredder or granulator.
Infeed Conveyor A conveyor belt system that moves materials into the shredder or granulator, allowing for continuous and automated feeding.
Discharge Conveyor A conveyor system that removes processed materials from the shredder or granulator and transports them to the next stage of processing or storage.
Overload Protection A safety feature that shuts down the machine if it is overburdened with material to prevent mechanical damage.
Flywheel A rotating wheel that stabilizes the machine’s energy and ensures smoother operation during cutting or shredding.
Blade Gap The precise spacing between the rotor and fixed blades, critical for effective cutting and material size control.
Hydraulic Ram A powered component that pushes bulky materials into the cutting chamber, commonly used in industrial shredders for heavy-duty applications.
Cutting Angle The angle at which blades meet materials, which influences the efficiency and quality of the shredding or granulating process.
Counter Knife A stationary knife positioned opposite the rotating blades, creating a shearing action to cut through materials.
Wear Plate A replaceable metal plate that protects machine components from abrasion and damage caused by processed materials.
Cutter Block The assembly that holds and supports the cutting knives or blades on the rotor.
Torque Limiter A mechanism that prevents damage by disengaging the drive system if the machine encounters excessive resistance or a blockage.
Baffle Plate A device inside the hopper or cutting chamber that helps guide materials into the blades for even cutting and shredding.
Hydraulic Power Pack A system that supplies hydraulic pressure to components like the ram or feed rollers, enabling smooth and powerful operation.
Bed Knife A stationary cutting blade mounted in the cutting chamber that works in tandem with the rotor knives to slice materials.
Screen Basket A cylindrical or semi-cylindrical screen used in some shredders or granulators to filter processed materials based on size.
Pulley System A series of wheels or belts that transfer power from the motor to the rotor or other moving parts of the machine.
Chipper Rotor A specialized rotor design with large, sharp blades, often used for shredding wood and fibrous materials.
Claw Cutter A blade design resembling a claw, often used in granulators to achieve efficient cutting and reduce material stress.
Reversible Blades Cutting blades that can be flipped and used on both sides, extending their lifespan and reducing maintenance costs.
Material Feed Sensor A sensor that monitors the flow of materials into the machine and adjusts feed rates to prevent overloading or jams.
Dust Extraction System An integrated system that removes dust and fine particles created during the shredding or granulating process to maintain a clean and safe environment.
Auto-Reverse Function A feature that automatically reverses the rotor’s direction if a jam occurs, preventing damage to the machine.
Knife Holder The structure on the rotor that secures individual cutting blades in place.
Edge Hardening A treatment applied to blade edges to improve durability and resistance to wear when cutting abrasive materials.
Magnetic Separator A machine add-on used to remove ferrous metals from shredded or granulated materials, ensuring cleaner outputs.
size reduction specific
Size Reduction Glossary Terms
Granulator-Specific Terms
Open Rotor A granulator rotor with knives mounted on an open frame, giving good airflow and cooling for film and light bulky scrap.
Closed Rotor (Solid Rotor) A heavy solid bodied rotor with high mass for thick walled parts, purgings, and heat sensitive materials.
Staggered Rotor A rotor with knives offset along its length for a continuous scissor like cut, lower noise, and smoother feeding.
Segmented Rotor A rotor built with replaceable knife segments to simplify maintenance and reduce wear cost.
Three Blade and Five Blade Rotor Common rotor knife counts, where more blades give finer, more uniform regrind at the cost of throughput.
Cutting Circle Diameter The diameter swept by the rotor knife tips, a primary indicator of granulator capacity.
Rotor Width The working length of the rotor, which together with cutting circle sets throughput.
Tangential Feed (Tangential Hopper) A feed geometry where material enters at an angle to the rotor, improving intake of long or bulky parts without a pusher.
Beside the Press Granulator A compact granulator placed next to a molding machine to reclaim sprues and runners immediately.
Central Granulator A larger granulator that serves multiple machines or a whole plant from one location.
Soundproofed Enclosure (Sound Dampening) Acoustic housing and hoppers that lower operating noise for in plant placement.
Slow Speed Granulator A low rpm, high torque granulator that produces less dust and noise and reduces fines.
Fines Undersized dust like particles in the regrind that can hurt downstream processing and are minimized by slow speed cutting.
Bulk Density The weight per unit volume of the regrind, which affects conveying and downstream feeding.
Shredder-Specific Terms
Single Shaft Shredder A shredder with one cutting rotor working against fixed counter knives, fed by a hydraulic ram, used across most ZERMA shredder models.
Dual Shaft (Twin Shaft) Shredder Two intermeshing shafts that grip and tear tough or bulky material with high torque at low speed.
Swing Ram (Two Speed Swing Ram) A pivoting hydraulic pusher that feeds material into the rotor and reverses to clear jams, used on ZSS and ZXS designs.
Hydraulic Pusher System The ram and power pack assembly that forces material against the rotor for consistent shredding.
Ram Cycle The forward and reverse motion pattern of the pusher that maintains feed and prevents bridging.
Internal Volume (Cutting Chamber Volume) The usable feed space above the rotor, larger on big volume models such as the ZIS for bulky parts.
Pre Cutting A first stage size reduction step before granulating, often the role of a shredder in a two stage system.
Throughput (Capacity) The weight of material a machine processes per hour, driven by rotor size, power, screen, and material type.
Output Particle Size The final flake or chip size, set primarily by the screen perforation diameter.
Screen Perforation Size The hole diameter in the discharge screen that controls maximum output particle size.
Knife Steel Grade The tool steel used for blades, selected for hardness and wear resistance against abrasive or filled materials.
Rockwell Hardness (HRC) The hardness rating of cutting knives, where higher values resist wear on abrasive feedstock.
System and Process Terms
Two Stage Size Reduction A layout that shreds bulky material first, then granulates it to a uniform regrind size.
Shredder Granulator Combination A single integrated unit that pre shreds and then granulates in one footprint, the ZCS concept.
Pulverizing (Pulverization) Reducing plastic to a fine powder, typically for rotomolding or PVC, the role of the PM disc pulverizer.
Disc Pulverizer A pulverizer using rotating and stationary grinding discs to produce powder from chips or flakes.
Conveying System Belt or screw conveyors that feed material in and move regrind out of the size reduction line.
Air Separation (Cyclone Separation) Using airflow and a cyclone to separate regrind from dust and convey it to storage.
Metal Separation (Metal Detection) Magnets and detectors that remove ferrous and non ferrous metal to protect the rotor and screen.
Closed Loop Recycling Reclaiming and reusing in house scrap on site to reduce virgin material purchases and waste.
Machine-Specific
Machine-Specific Terminology
Shredders
ZSS General Purpose Shredder Single shaft shredder with a two speed swing ram for everyday plastics recycling of rejects, runners, and purgings.
ZCS Shredder Granulator Combination A combined pre shredder and granulator in one machine for single pass size reduction.
ZBS Lump and Purge Shredder A single shaft shredder with a tangential infeed that handles lumps and purge blocks without a hydraulic feed system.
ZIS Big Volume Shredder A single shaft shredder with a large internal volume and redesigned pusher for bulky, low density material.
ZHS Horizontal Shredder A single shaft shredder with an angled hydraulic ram suited to varied material shapes and sizes.
ZRS Pipe Profile Shredder A single shaft shredder able to take large diameter pipe up to 1200 mm without pre cutting.
ZXS Heavy Duty Shredder A heavy duty single shaft shredder with a two speed swing ram that resists blocking and guide rail wear.
ZXS-T Tire Recycling Shredder A single shaft shredder configured for whole or pre shredded tires.
Granulators
GSL Slow Speed Granulator A low speed, low noise, low dust granulator with a staggered rotor for clean regrind.
GSC Compact Soundproofed Granulator A beside the press granulator with a full soundproof enclosure for quiet in plant operation.
GST Tangential Granulator A compact soundproofed granulator with a tangential feed and sound dampening hoppers for bulky parts.
GSE Economical Granulator A value central granulator with multiple rotor designs in 300 to 700 mm diameters and 300 to 1400 mm widths.
GSH Heavy Duty Granulator A central granulator with a wide range of rotor and hopper options for demanding size reduction.
GSP Pipe and Profile Granulator A granulator built for pipe and profile, with rotor widths up to 1400 mm and 560 to 700 mm diameters.
PM Plastics Pulverizer A high speed disc pulverizer in 300 to 800 mm disc diameters that produces fine powder.
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