HDPE Recycling Equipment: Complete Guide to HDPE Recycling Machines & Lines

Recyklace HDPE (high-density polyethylene recycling) is one of the highest-volume and most profitable plastic recycling streams worldwide — covering pipes, drums, crates, bottles, caps, and industrial containers. The full HDPE recycling process requires 6 categories of equipment, each with material-specific configurations that differ from PET, PVC, or PP recycling lines. Get the equipment selection wrong and you produce off-spec rHDPE pellets that fail buyer specifications. This guide covers every HDPE recycling machine category, complete line configurations, capital cost benchmarks, and a buyer’s checklist for sizing your HDPE recycling plant.

For pipe-specific HDPE recycling, see our dedicated plastová rourková recyklační průvodce. For PET-specific equipment, see the PET sušicí příručku pro flíčky. This article focuses on HDPE recycling end-to-end equipment selection.

Why HDPE Is Different from Other Plastic Recycling Streams

HDPE has three properties that drive HDPE-specific equipment requirements:

• Low moisture sensitivity — HDPE absorbs less than 0.01% moisture from ambient air (PET absorbs 0.4–0.5%). HDPE recycling lines tolerate 3–5% moisture into the extruder for most applications, eliminating the need for crystallizers and desiccant dryers required by PET
• High mechanical toughness — HDPE pipes, drums, and containers are thick-walled and impact-resistant. Shredding and granulating equipment needs higher motor torque and reinforced blades compared to film or PET recycling
• Wide application diversity — HDPE waste streams range from clean post-industrial pipe scrap to contaminated post-consumer bottles to mixed-color crates. Equipment configuration depends heavily on input source quality

These properties keep HDPE recycling capital cost 30–50% below equivalent PET lines (no crystallizer, no desiccant dryer, simpler thermal stage) and operating cost 20–30% below PET (less drying energy). HDPE is the most economical plastic to recycle at scale.

The 6 Categories of HDPE Recycling Equipment

A complete HDPE recycling line uses equipment from these 6 categories, in sequence:

1. HDPE drtič — primary size reduction (40–120 mm chips)
2. HDPE granulator (pipe crusher) — secondary size reduction (8–15 mm flakes)
3. HDPE washing line — friction washing, float-sink separation, optional hot wash
4. HDPE dewatering / drying system — centrifugal dewatering and optional thermal drying
5. HDPE peletovací stroj — extrusion and pellet cutting
6. Auxiliary equipment — sorting, metal detection, conveyors, storage silos

Some operations skip categories depending on input quality and end-product spec. Pipe extrusion plants with clean scrap can skip washing (categories 3 only need granulator + dryer + pelletizer). Plants selling unprocessed flakes can skip pelletizing. Most HDPE recycling plants use all 6 categories for high-value pellet output.

Category 1: HDPE Shredder

The HDPE shredder is the first machine in any HDPE recycling line. It reduces oversized HDPE waste — pipes, drums, IBC tanks, large containers, baled rigid scrap — into 40–120 mm chips that downstream equipment can handle.

HDPE Shredder Types

• Single-shaft HDPE shredder — most common configuration; rotor + hydraulic pusher; handles 800–5,000 kg/h; ideal for pipes, drums, mixed rigid scrap
• Double-shaft (twin-shaft) HDPE shredder — two counter-rotating rotors; lower throughput but accepts mixed/contaminated waste better; 500–3,000 kg/h
• Pipe-specific HDPE shredder — extended horizontal feed for long pipes up to 1,600 mm diameter and 6 m length; specialized for infrastructure pipe recycling. See our HDPE pipe shredder product page
• Mobile HDPE shredder — trailer or skid-mounted unit for on-site processing of distributed HDPE waste streams. See our mobilní drtič trubek

HDPE Shredder Specifications

• Motor power: 30–250 kW depending on throughput and material thickness
• Blade material: D2 tool steel (standard) or SKD-11 (premium); 8,000–12,000 hour service life on clean HDPE
• Rotor diameter: 350–650 mm
• Output size: 40–120 mm screen-controlled
• Capital cost: $30,000–$300,000 depending on capacity and configuration

For mobile vs fixed shredder selection criteria, see our příručku pro výběr pohyblivého vs. statického drcníku.

Category 2: HDPE Granulator (Pipe Crusher)

HDPE granulators (also called HDPE crushers or pipe crushers) reduce shredder output (40–120 mm chips) to 8–15 mm flakes — the size needed for washing, drying, and extrusion. The granulator is the second size-reduction stage and produces the actual flake output that goes to washing and pelletizing.

HDPE Granulator Types

• Wet granulator — water injected into cutting chamber during operation; cools blades, washes some surface contamination, reduces dust; standard for HDPE post-consumer streams
• Dry granulator — žádná voda v komoře; menší zastavěná plocha, žádné zpracování odpadní vody; vhodné pro čisté trubkové extruzní odpad
• Large-diameter HDPE pipe crusher — specialized for thick-wall pipe chips; wider feed opening, higher torque. See our velký průměr HDPE trubkový drcník

HDPE Granulator Specifications

• Motor power: 22–110 kW for 500–3,000 kg/h capacity
• Rotor speed: 400–600 RPM (HDPE tolerates higher speeds than PET)
• Output flake size: 8–15 mm screen-controlled
• Capital cost: $25,000–$100,000

Category 3: HDPE Washing Line

Ten/Ta/To HDPE washing line cleans flakes from contamination (dirt, labels, residue, light contaminants) and separates HDPE from any cross-polymer mix. For HDPE-only post-industrial streams, washing is sometimes skipped. For post-consumer HDPE (bottles, drums) or infrastructure pipe (excavated soil), washing is mandatory.

HDPE Washing Line Stages

1. Předmycovací nádrž — soaks flakes 5–10 minutes; loosens dirt and surface contamination
2. Třecí podložka — high-speed mechanical scrubbing; 30–55 kW motor for 1 ton/h
3. Oddělovací nádrž vodní hladiny — water density 1.0 g/cm³; HDPE (0.95 g/cm³) floats and is collected from the surface; PVC, PET, and other dense contaminants sink
4. Horké mytí (volitelné) — 80–95°C with caustic soda; removes labels and adhesives; needed for premium HDPE pellets
5. Rozmývací nádrž — clean water rinse before drying

HDPE Washing Line Specifications

• Kapacita: 500–3,000 kg/h typical for HDPE recycling
• Water consumption: 2–5 m³/ton of input flakes (closed-loop with filtration reduces by 60–80%)
• Capital cost: $80,000–$250,000 for complete HDPE washing line at 1 ton/h

Category 4: HDPE Dewatering & Drying System

Washed HDPE flakes leave the washing line at 30–40% surface moisture. The drying system reduces moisture to extrusion-ready spec.

Mechanical Dewatering (Mandatory)

A odstředivý odvodňovací stroj spins flakes at 800–1,500 RPM, throwing water radially through a perforated screen. Output: 2–4% moisture flakes ready for direct extrusion (HDPE only — PET would still need thermal drying).

• Motor power: 22–55 kW for 500–2,000 kg/h capacity
• Spotřeba energie: 30–50 kWh per ton dewatered
• Capital cost: $15 000–$45 000

For horizontal vs vertical centrifugal dewatering selection, see our comparison guide.

Thermal Drying (Optional for HDPE)

For premium HDPE pellets (fiber-grade, food-contact, high-spec extrusion), an optional termální sušička reduces moisture from 2–4% to under 0.5%. For most HDPE applications (pipe, drum, crate, low-spec), thermal drying is unnecessary — centrifugal dewatering alone produces extrusion-ready flakes.

• Motor + heater: 7.5 kW blower + 80–200 kW electrical heater
• Spotřeba energie: 120–180 kWh per ton evaporated
• Capital cost: $25,000–$80,000

For a complete drying-stage configuration, see our plastic drying system pillar guide.

Category 5: HDPE Pelletizing Machine

Ten/Ta/To HDPE peletovací stroj melts dried flakes and forms them into recycled HDPE pellets ready for new product manufacturing. Single-screw extruders are most common for HDPE (vs. twin-screw, which is more common for PET because of higher degassing requirements).

HDPE Pelletizing Process

1. Hopper feeding — dried HDPE flakes feed into the extruder hopper; level sensors maintain consistent feed
2. Extruze — flakes melt at 180–220°C in the extruder barrel; screw conveys melt forward; degassing zone removes any residual moisture or volatiles
3. Filtrace — melt passes through a screen changer (typically 60–100 mesh) to remove fines, paper, and other contamination
4. Peletizace — die-face cutter (water ring) or strand pelletizer chops the extrudate into 2–4 mm pellets
5. Cooling and storage — pellets cool in water, dry in centrifugal pellet dryer, and are bagged or silo-stored

HDPE Pelletizer Specifications

• Motor power: 55–250 kW for 300–2,500 kg/h pellet output
• Screw L/D ratio: 30:1–35:1 for HDPE (allows adequate melt time and degassing)
• Výstup: 2–4 mm rHDPE pellets, density 0.95 g/cm³, MFI matched to virgin grade
• Capital cost: $50 000–$200 000

Category 6: Auxiliary Equipment

HDPE recycling lines need supporting equipment for material handling, contamination control, and quality assurance:

• Magnetické oddělovače — overhead drums or pulleys to remove ferrous metal from input stream; protects shredder/granulator blades
• Eddy current separators — non-ferrous metal removal (aluminum from caps, copper from cables); see our vodicí oddělovač eddyho proudů
• NIR sorters — automated polymer-type identification and removal of cross-polymer contamination; mandatory for mixed-source HDPE
• Conveyors — belt or screw conveyors between stages; capital cost $5,000–$25,000 per stage
• Storage silos — buffer storage between stages; smooths flow variations
• Quality control instruments — melt flow indexer, density meter, moisture analyzer; $20,000–$40,000 total

Complete HDPE Recycling Line Configurations

Aplikace	Vyžadované vybavení	Propustnost	%%
HDPE pipe-to-pipe (closed loop)	All 6 categories	500–3 000 kg/h	$250,000–$600,000
HDPE bottle-to-bottle	All 6 + hot wash + label removal	500–2,000 kg/h	$300,000–$700,000
HDPE drum/IBC tank recycling	Heavy-duty shredder + categories 2–6	500–2,500 kg/h	$280,000–$650,000
vysokorychlostní výrobní linka pro extruzi potrubí (čisté odpadní suroviny)	Granulator + dryer + pelletizer (skip 1, 3)	200–1,500 kg/h	$80 000–$200 000
Mixed post-consumer HDPE	All 6 + NIR sorting + extra wash stages	500–2,500 kg/h	$400,000–$900,000
Mobile HDPE shredding (no on-site pelletizing)	Mobile pipe shredder only	800–4,500 kg/h	$80,000–$250,000

Klíčové ponaučení: HDPE pipe-to-pipe closed-loop recycling at 1 ton/h costs $250,000–$600,000 — significantly less than equivalent PET bottle-to-bottle ($600,000–$1,000,000+) because HDPE doesn’t need crystallizers or desiccant pellet dryers. The simpler thermal stage is HDPE’s biggest economic advantage over PET recycling.

HDPE Recycling Equipment Cost Breakdown

For a 1 ton/h HDPE recycling plant (typical mid-size operation), here’s how capital cost distributes across equipment categories:

Kategorie	Zařízení	Typická cena (USD)	% z celkem
1	HDPE drtič	$60,000–$150,000	20–25%
2	HDPE granulator	$25,000–$80,000	10–15%
3	HDPE washing line	$80 000–$200 000	25–35%
4	Dewatering + optional thermal	$15,000–$80,000	5–15%
5	HDPE peletovací stroj	$50,000–$180,000	20–30%
6	Auxiliary (sorters, conveyors, QC)	$30,000–$80,000	10–15%
Total	Complete 1 ton/h HDPE recycling plant	$260,000–$770,000	100%

Add 15–25% to total for installation costs: foundation work, electrical hookup (typically 200–500 kW total connected load), wastewater treatment (if not already in place), and on-site commissioning.

HDPE Recycling Plant Buyer’s Checklist

Step 1: Identify Your Input Source

Pipe waste? Bottles? Drums? Mixed post-consumer? Each has different shredder and washing requirements. Pipe waste needs specialized horizontal-feed shredders. Bottles need label removal during washing. Drums need heavy-duty shredders for thick walls. Mixed streams need NIR sorting upstream.

Step 2: Define Your End-Product Spec

Pipe-grade pellets (low-spec, $800–$1,000/ton): centrifugal dewatering only, no thermal drying. Premium grade (extrusion molding, $1,000–$1,500/ton): add thermal drying. Food-contact rHDPE ($1,500–$2,000/ton): hot wash + thermal drying + extra QC. The end-product spec drives 30–40% of total equipment cost.

Step 3: Calculate Peak Throughput

Peak feed is typically 1.5–2× daily average due to batch operation and cleanup gaps. Size each equipment category for peak; install buffer hoppers between stages to absorb variations. The shredder is usually the throughput bottleneck — size it 20% above other categories.

Step 4: Verify Material of Construction

HDPE is non-corrosive, so carbon steel is acceptable for most equipment (vs. stainless steel mandatory for PET). However: if your line will also process PVC, specify acid-resistant materials (chlorine off-gassing). For food-contact rHDPE, use SS304 in all material-contact areas.

Step 5: Plan Wastewater Handling

HDPE washing lines use 2–5 m³ water per ton input. Closed-loop water recycling reduces consumption by 60–80% but adds $30,000–$80,000 to capital cost. Without closed-loop, plan for wastewater treatment infrastructure (settlement tanks, filtration, pH adjustment). Local wastewater discharge regulations vary widely — verify before line design.

HDPE Recycling Equipment Common Buyer Mistakes

Mistake 1: Buying Equipment Designed for PET

HDPE doesn’t need crystallizers or desiccant pellet dryers. Operations that buy “complete plastic recycling lines” sometimes get sold PET-spec equipment and pay 30–50% more capital cost for capabilities they don’t use. Specify HDPE-only equipment unless you’ll process PET on the same line.

Mistake 2: Skipping Float-Sink Separation

Float-sink separation seems redundant for “single-material HDPE” inputs. Reality: post-consumer HDPE always contains 1–3% PVC contamination from labels, fittings, or sorting errors. PVC at HDPE extrusion temperatures generates HCl and degrades the polymer. Always include float-sink stage for any non-pristine HDPE input.

Mistake 3: Undersizing the Pelletizer

The pelletizer is the most expensive single category and the throughput bottleneck for downstream output. Sizing the pelletizer at upstream peak rather than 80% utilization causes recurring melt instability and pellet quality issues. Size pelletizer at 110–120% of average input to give degassing time and quality margin.

Mistake 4: Inadequate Quality Control

rHDPE pellets need MFI, density, contamination, and moisture testing per batch to meet buyer specs. Operations selling rHDPE without consistent QC end up with rejected lots and stuck inventory. Budget $20,000–$40,000 for inline QC instrumentation as part of initial line design.

Caste dotazy

What equipment is needed for HDPE recycling?

A complete HDPE recycling line requires 6 categories of equipment: (1) HDPE shredder, (2) HDPE granulator/pipe crusher, (3) HDPE washing line (friction washer + float-sink + optional hot wash), (4) HDPE dewatering and optional thermal drying, (5) HDPE pelletizing machine, and (6) auxiliary equipment (magnetic/eddy current separators, NIR sorters, conveyors, QC instruments). Total: 8–14 individual machines for a 1 ton/h line.

How much does HDPE recycling equipment cost?

For a complete 1 ton/h HDPE recycling line: $260,000–$770,000 depending on input source quality and end-product spec. Pipe-to-pipe closed-loop: $250,000–$600,000. Bottle-to-bottle (with hot wash): $300,000–$700,000. Pipe extrusion plant inline (clean scrap, simpler line): $80,000–$200,000. Mobile-only operations: $80,000–$250,000. Add 15–25% for installation costs.

What is HDPE recycling?

HDPE recycling converts end-of-life high-density polyethylene products — pipes, drums, IBC tanks, bottles, caps, crates — into recycled HDPE (rHDPE) pellets for new product manufacturing. The process has 5 stages: collection & sorting, primary shredding (40–120 mm chips), secondary granulating (8–15 mm flakes), washing & separation, and drying & pelletizing. Output rHDPE pellets are typically 30–40% cheaper than virgin HDPE and suitable for new pipe extrusion (closed-loop), injection molding, and blow molding.

What is the difference between HDPE recycling and PET recycling equipment?

Three main differences: (1) HDPE doesn’t need a crystallizer (PET requires one for sheet/bottle grades because amorphous PET sticks at high temperatures); (2) HDPE doesn’t need a desiccant pellet dryer (PET bottle-to-bottle requires sub-50 ppm moisture, achieved only with desiccant drying); (3) HDPE thermal drying is optional (PET thermal drying is mandatory). These differences make HDPE recycling lines 30–50% cheaper in capital cost and 20–30% cheaper in operating cost than equivalent PET lines.

How much do HDPE pellets sell for?

Recycled HDPE (rHDPE) pellet prices vary by quality grade: pipe-grade rHDPE (low-spec, suitable for non-pressure pipe and crates): $700–$1,000/ton; standard injection-grade rHDPE: $900–$1,300/ton; food-contact rHDPE (rare, requires hot wash + premium QC): $1,500–$2,200/ton. Virgin HDPE typically sells at $1,200–$1,800/ton depending on global oil prices. rHDPE typically prices 25–40% below virgin equivalent grades.

Is HDPE recycling profitable?

Yes — HDPE recycling is one of the most profitable plastic recycling streams. Capital payback typically 3–5 years for 1 ton/h operations with reliable input streams. Profitability factors: input cost ($0–$200/ton from waste suppliers), pellet sales price ($800–$1,500/ton), operating cost ($150–$300/ton for energy, labor, consumables, water). Net margin: $300–$700/ton depending on stream quality. HDPE pipe-to-pipe closed-loop recycling has the highest margins because pipe waste is clean, single-material, and high-volume.

What is an HDPE granulator?

An HDPE granulator (also called an HDPE crusher or pipe crusher) is the secondary size-reduction machine in an HDPE recycling line. It takes shredded HDPE chips (40–120 mm) and reduces them to 8–15 mm flakes ready for washing and pelletizing. HDPE granulators use 22–110 kW motors at 400–600 RPM with screen-controlled output. The most common type for HDPE pipe recycling is a wet granulator with water injection for cooling and dust reduction. Capital cost: $25,000–$100,000.

Závěr

HDPE recycling equipment selection depends on input source (pipes, drums, bottles, mixed), throughput (typically 500–3,000 kg/h), and end-product spec (pipe-grade, injection-grade, food-contact). The 6 equipment categories — shredder, granulator, washing line, dewatering/drying, pelletizing, auxiliary — work in sequence to convert end-of-life HDPE waste into high-value rHDPE pellets. Capital cost for a complete 1 ton/h HDPE recycling line ranges $260,000–$770,000, significantly below equivalent PET lines because HDPE doesn’t require crystallizers or desiccant drying.

Energycle supplies complete HDPE recycling equipment lines and individual machines: lisovací stroje na HDPE trubky, mobile HDPE shredders, HDPE pipe crushers, HDPE washing lines, odstředivé odvodňovací strojea HDPE pelletizing machines. Contact our engineering team with your HDPE input source, throughput target, and end-product spec — we’ll recommend the right configuration with detailed quote, line layout, and installation timeline.

Souvisejici zdroje

• Plastic Pipe Recycling Process: Complete Step-by-Step Guide
• Plastic Pipe Recycling: Mobile vs Fixed Shredder Selection
• Stránka produktu Lisovací stroj na HDPE trubky
• Stránka produktu Mobilní lisovací stroj na drcení trubek
• Horizontální vs. vertikální centrifugální odvodyč
• Plastic Drying System: Complete Pillar Guide
• How to Make Plastic Pellets: PET, HDPE & LDPE