Extrusion Scrap & Purge Shredder — Lumps, Trims & Start-Up Waste

Because a granulator is a high-speed cutting machine designed for thin-walled scrap. A solid purge lump presents a thick, dense cross-section that the blades cannot bite into cleanly — the result is shock-loaded, chipped or broken blades and a stalled rotor. A single shaft shredder works the opposite way: a slow 80 rpm rotor with high torque takes small progressive bites out of the lump until it is reduced to pieces a grinder can handle safely. That is why hard extrusion scrap is always a two-stage job.

The side-feeding hopper opening is 600 × 1000 mm, with a 650 × 600 mm cutting chamber below it — large enough for the purge blocks and head drainage that a typical pipe or sheet line produces, loaded manually or by trolley. Long pipes and profiles are sawn into hopper-length sections first; that is normal practice and takes minutes. If your purgings are exceptionally large, send us photos with dimensions and we will confirm fit before you visit for a trial.

It depends on your scrap mix. If your waste is mostly thin trims, small offcuts and off-spec product with thin walls, an RE-series grinder alone may cover you. If you generate purge lumps, thick-wall pipe offcuts or solid blocks, you need the S3-600 ahead of it — and if you only need coarse shred (for example, to sell to a reprocessor), the shredder alone may be enough. Many plants phase the purchase: shredder first to clear the purge backlog, grinder second to close the loop in-house.

Clean, polymer-segregated regrind from your own line is high-quality feedstock — it is your own resin with one extra heat history. Most extrusion plants dose it at a controlled ratio into middle layers of multilayer pipe and sheet, into non-pressure or non-critical products, or blend it down gradually across production. Standards matter here: pressure-pipe specifications limit rework content, so check the relevant IS standard for your product class. What regrind never does is improve by waiting — reprocess it before it picks up dirt.

Yes — the S3-600 shreds rigid PVC pipe and profile offcuts along with HDPE, PP and other polymers; the machine also takes wood, paper and FRP, so one shredder can serve mixed plant waste streams (shredded separately, never blended). Keep PVC strictly segregated from polyolefins for reprocessing, since even small cross-contamination ruins both streams. For the PVC-specific picture — including what happens downstream of shredding — see our PVC pipe shredding page.

Every machine is quoted to the job. What moves the number is capacity, throat size, motor rating, MS or SS construction and the automation you add — a blower, a conveyor, a control panel. Our guide to what drives machine cost walks through each of those; send us your material and daily volume and we will size the machine and quote it, usually the same day.

The machine is built for continuous duty — all-metal construction with no plastic parts, heavy-plate chamber walls, and hardened tool-steel blades. Routine care is straightforward: keep the cutting chamber clean, lubricate as scheduled, and have blades attended to periodically depending on running hours and material abrasiveness. We provide installation and on-site maintenance service, and spares are supplied from Mumbai pan-India.