HVC Heavy-duty Plastic Crusher (Grinder)

HVC heavy-duty plastic crusher (grinder)

A plastic crusher is a size-reduction machine that breaks plastic waste down into smaller flakes or particles for recycling. It is one machine, not a line — and that distinction matters, because almost every buying mistake on this page comes from asking a crusher to do a job that belongs to a shredder, or from choosing a chamber size on throughput alone.

The HVC series covers seven sizes, from a 37 kW machine doing 200–300 kg/h of PET bottles up to a 132 kW machine doing 1.5–2 t/h. What follows is how the machine is put together, which variable actually controls your output size, and how to read the model numbers — because in this series the model number is the specification.

What a crusher is, and what the name confusion costs you

Three words get used for overlapping machines, and the overlap is not harmless when you are comparing quotations.

Crusher and grinder are the same machine: a high-speed rotor carrying rows of blades, working against fixed counter knives, discharging through a screen. Granulator is used two ways in the industry — in size reduction it means this same machine, while in compounding it means a pelletiser that melts and cuts plastic into pellets. If a supplier quotes you a "granulator" without a chamber dimension and a screen size, you cannot tell which of the two you are being offered.

What a crusher is not: it is not a shredder, and it is not a washing line. It reduces size. It does not clean, separate polymers, or dry. Where the flake goes next — a washing line, an agglomerator, an extruder, or straight back into an injection moulding machine as regrind — is a separate decision.

Crusher or shredder? Speed against torque

This is the fork most buyers are actually standing at, and there is a clean way to decide it.

A crusher runs faster but with less torque than a shredder. That makes it the right tool for brittle and thin-walled plastics — bottles, sprues, thin containers, film, foam — where the material fails readily and the job is to get through volume. It also produces a smaller and more uniform output than a shredder, which is why it sits downstream of one in a full line, and why its output can often go straight into a process that a shredder’s coarse, ragged output could not feed.

A shredder is the opposite trade: slow, high torque, built to bite into thick-walled, tough or unpredictable material. If your feedstock includes heavy drums, thick profiles, or anything you cannot guarantee is free of surprises, the crusher is the second machine in the sequence, not the first.

The two are complementary rather than alternatives. In a full recycling line a shredder opens the material up and a crusher brings it down to a usable flake size.

Inside the cutting chamber

Three components do the work, and they are the three you should be asking about.

Rotor assembly

A high-speed rotating shaft carrying mounted blades. On the HVC series the rotor carries 3–7 rows of rotary knives, the count depending on material and capacity. More rows means more cuts per revolution and a finer, more consistent cut on light material; fewer, heavier rows suit denser feed.

Fixed blades (counter knives)

Stationary blades mounted in the chamber wall. Cutting happens in the gap between a rotating blade and a fixed one — the material is sheared, not smashed. This is why blade clearance is the setting that most affects cut quality, and why a worn set produces heat and dust instead of clean flake.

Screen (mesh grate)

A perforated plate beneath the rotor. Material stays in the chamber and keeps getting cut until it is small enough to pass through. Nothing leaves the machine larger than the screen hole.

The screen is what sets your output size

Of everything on this page, the screen is the variable you will change most often, and the one that decides whether the flake suits its next process. Common screen sizes run from 8 mm to 100 mm.

The logic is simple but worth stating plainly: because material recirculates in the chamber until it fits through the hole, a smaller screen means more passes, more cuts, finer output — and lower throughput and higher power draw for the same tonnage. A larger screen means coarser flake and more capacity. You are trading particle size against output, and there is no setting that gives you both.

Choose the screen from the downstream process, not from the material. Flake heading into a washing line can be coarse. Regrind going back into an injection moulding machine has to match the virgin pellet it is being blended with, which pushes you toward the fine end.

Reading an HVC model number

The model number is not a catalogue code. In this series it is the crushing chamber dimension, which makes the range easy to read once you know the rule.

HVC500-800 has a chamber of 500×780 mm. HVC600-1000 is 600×980 mm. HVC800-1200 is 800×1180 mm. The first figure is the chamber width exactly; the second is its length rounded up to the nearest hundred.

That matters because two machines in this range have identical motor power and identical rated capacity but different chamber geometry. The HVC700-1000 (700×980 mm) and the HVC600-1200 (600×1180 mm) are both 75 kW and both rated at 1000 kg/h on PET bottles. They are not interchangeable. The 700 mm rotor is wider and handles bulkier, chunkier feed; the 1180 mm chamber is longer and swallows longer items such as pipe and profile without pre-cutting. Pick on the shape of what you are feeding, not on the throughput figure that makes them look the same.

Seven models, 200 kg/h to 2 t/h

Two cautions when reading this table. First, the capacity column is measured on PET bottles. PET bottles are thin-walled, brittle and low in bulk density — close to the easiest thing a crusher will ever be asked to do. Denser or tougher feedstock, and a finer screen, both move the real figure down. Treat the column as a comparison between models rather than as a promise for your material.

Second, power does not scale with capacity. Going from the HVC500-800 to the HVC800-1200 is roughly a sevenfold increase in throughput for about 3.5 times the motor. Larger chambers are simply more efficient per tonne, which is worth weighing against the higher connected load if you are sizing an electrical supply.

Feeding, discharge and what happens when it jams

The hopper is a wide-mouth design for feeding bulk plastic waste, and on this series it opens by motor or by hydraulic power station — a detail that matters more than it sounds, because the hopper has to be opened for every screen change and every blade inspection. On a machine you service weekly, powered opening is the difference between a routine job and a two-person job.

Two feed and discharge options are available. A pusher system — hydraulic or pneumatic ram — forces material into the blades, which is worth having for springy, low-density feed that would otherwise bridge above the rotor. A discharge conveyor takes crushed material to the next process instead of into a bin.

For protection the machine carries overload sensing with auto-reverse for jamming. A crusher is a high-speed, relatively low-torque machine, so an unexpected hard object stalls it rather than being cut through; the rotor backs off instead of stalling under load.

Frame, vibration and noise

A high-speed rotor throwing hard plastic against fixed knives is a noisy, vibrating thing, and both are handled structurally. The machine sits on a heavy-duty steel frame with a vibration-dampening design, and a noise-reduction enclosure is available as an option for urban or indoor installations.

Worth deciding early rather than late: an enclosure is far easier to specify with the machine than to retrofit around one already bolted down, and site noise limits are usually discovered after the neighbours notice.

What operators actually run it on

Pre-crushing before granulation

Breaking large plastic items — bottles, containers, films, bags, pipes — down before a finer process.

Post-consumer waste

PET bottles and PET packing straps, HDPE containers, drums and barrels, HDPE, LDPE and LLDPE films, PVC pipes and profiles, PC, PS and PA, and EPE/EPS expanded foam plastics.

Industrial scrap

Reject parts, purgings and sprues from injection moulding, reground for reuse. This is the shortest loop in plastics recycling: scrap becomes regrind and goes back into the same machine that produced it.

WEEE and electronics housings

Plastic housings from electronic waste.

Read as a set, three jobs dominate in practice: crushing PET and HDPE bottles ahead of a washing line, regrinding moulding sprues and rejects, and pre-crushing LDPE/LLDPE film rolls before agglomeration.

Keeping the output consistent

Four maintenance items, and each one has a specific failure mode attached to it.

Blade sharpening and replacement. Dull blades increase power consumption. This is the useful early warning — rising current draw at unchanged throughput usually means the knives, not the motor.

Screen cleaning. A partly blocked screen keeps material circulating that should have left, so output drops and flake gets finer than you asked for. Consistency problems that appear gradually are usually the screen.

Bearing lubrication. The rotor turns fast and the bearings carry it; lubrication is what keeps wear off them.

Even feeding. Overloading is the main cause of jamming. Feeding steadily rather than in slugs does more for uptime than any other operating habit.

See the machine running

Frequently asked questions