HDPE & LDPE Grinder Machine for Recycling

Yes. HDPE and LDPE are both polyethylenes and cut well on the same blade-and-mesh system — the machine does not care about the density difference. What matters commercially is keeping the regrind streams separate: HDPE regrind goes back into rigid products (pipes, containers), LDPE into films and flexible goods, and a mixed batch fetches less. Most of our customers run the two materials in separate batches on one machine and simply clear the chamber between runs.

HDPE pipes recycle very well — pipe regrind is in steady demand from pipe extruders themselves. The practical question is feeding: a 6-metre pipe obviously does not drop into a grinder hopper. Pipes are pre-cut into sections sized to the machine’s throat (for example, a 20″ × 20″ throat takes correspondingly sized pieces), and thick-wall sections should go to the higher-HP models so the rotor keeps cutting without stalling. Tell us your pipe diameters and wall thickness and we will specify the right model.

The blower pneumatically conveys regrind out of the cutting chamber into collection bags the instant it passes the mesh. Without it, light PE regrind piles up under the machine and someone must keep raking and bagging it. With it, the chamber stays clear (steadier throughput), the floor stays clean, fine dust ends up in the bag instead of the air, and one operator runs the whole station. For dedicated HDPE/LDPE work running full shifts, the blower pays for itself quickly — see the RE Series CB Grinder with Blower page for blower motor ratings per model.

Most blow molding and injection molding lines in India accept regrind from a standard mesh comfortably, blended with virgin granule. The mesh screen controls output size — 15 mm is our standard and we customise it to your buyer’s or your own line’s specification. Because the mesh is a replaceable part, you can change regrind size later without changing the machine.

That depends on your product and quality standards — common practice in Indian blow molding and pipe extrusion is to blend a proportion of clean, single-grade regrind with virgin material, with the ratio set by trial against your product’s strength and finish requirements. The grinder’s job is to give you regrind clean and uniform enough that the blend works: single polymer, consistent size, no overheated or degraded material. Your polymer supplier or our team can advise starting ratios for your application.

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.

Convert your scrap to kilograms per day and divide by your working hours. A plant generating 500 kg/day over one shift needs roughly 60–70 kg/hr of real throughput — an RE12 or RE16 class machine with headroom. High-volume recyclers buying scrap by the tonne should look at RE25/RE30 with blower (300–600 kg/hr). Remember that thick-wall and bulky items grind slower than thin bottles, so size against your heaviest material, not your average. Our machine selection guide covers this step by step.

Yes on all three. Bring your HDPE/LDPE scrap to our Mumbai works for a live trial before you buy. We provide installation and maintenance service on site, support machines pan-India with spares from Mumbai, and blades can be resharpened periodically as routine maintenance. For export orders we supply motors matched to your country’s voltage and frequency. Contact us to arrange a trial.