Guidetti PMG Pre-Shredders

The Guidetti PMG 900 pre-shredder is the high-capacity electric machine in the PMG range. Electric cable, non-ferrous metals, composites and mixed industrial waste go in whole and come out sized for the stage behind them, at up to 3,000 kg/h. Engineered Recycling Systems supplies and integrates it from Atlanta.

Where the 900 sits

It is the point in the range where a plant stops processing batches and starts running a line. Below it, the PMG 600 and PMG 400 suit intermittent work and tight spaces. Above it, the PMG 1200 and PMG 1600 increase rotor width again.

The headline figure of 3,000 kg/h depends entirely on material and configuration. Clean cable and mixed contaminated scrap do not run at the same rate through the same machine, and the honest number for any plant comes from a trial rather than a brochure.

Electric or hydraulic

The 900 runs an electric drive. Where feed is dense, laminated or reinforced enough to stall one, the PMG 900 H is the same rotor width with hydraulic drive, holding torque at low speed instead of tripping.

That choice follows from the material rather than from preference. Armored cable, bundled reels and composite housings usually point hydraulic; general cable, plastics and light metals run fine on electric and cost less to buy and run.

How it cuts

Material is fed manually or by conveyor into the cutting chamber, where intermeshing blades fragment it at low speed. Low speed gives uniform particle sizing while keeping dust and noise down — not a small point on a machine this size running continuously.

A conveyor belt with magnetic pulley carries the output away and takes ferrous contamination out inline, before it reaches further shredding or granulation. Overband separators are available in several sizes where the ferrous load justifies one.

What it feeds

The pre-shredder is stage one. Behind it sit Sincro granulation lines for cable, dry separation tables for the density split, and hammer mills where final sizing is needed.

Protecting those stages is most of the economic case. A granulator fed oversized material jams, wears fast and gives an inconsistent fragment. Fed a sized feed it runs at its rated throughput and its knives last, so the saving appears in wear parts rather than in headline tonnage.

What runs through it

Copper and aluminum cable of most constructions. Rubber, plastics, wood, paper and composite scrap. E-waste too bulky for a precision machine to take directly, and mixed industrial feedstock that arrives in whatever shape the last process left it.

The common factor is size and resistance rather than material type. If it is too big, too tough or too tangled for the next machine, it goes through a pre-shredder first.

Where it fits in a line

ERS integrates the 900 with conveyors, granulators, air separation and dust extraction so the stages balance. A pre-shredder that outruns the granulation behind it does not raise output — it moves the bottleneck somewhere harder to see.

At this capacity the handling either side usually decides the real throughput. Feed arriving in surges, or a discharge that backs up, will cost more over a year than the difference between two machine sizes.

Maintenance

Easy-access panels and a rotary valve system keep material moving and make inspection straightforward. Sealed bearings, reinforced housings and an operator-level control interface suit continuous duty with minimal supervision.

Blades and screens are consumables. What decides their real cost is how long the line stands still while they are changed, which is why access is designed in rather than worked around.

How a project starts

With the material. ERS looks at what arrives, in what volume, what has to be recovered and the building it has to fit inside. Material can be run at the ERS test facility in Atlanta before anything is specified, which on a machine this size is worth doing properly.

Every machine ERS supplies is installed, commissioned and supported by ERS, with spare parts and service from Atlanta. The full Guidetti range is available alongside it.

Talk to ERS about what you are feeding and what the next machine needs to see.