Quick answer: Plastics recycling equipment is the industrial machinery that turns post-consumer or post-industrial plastic waste into clean, reusable raw material — typically pellets or flakes. A full line includes six matched stages: pre-sorting and size reduction, granulating, washing, drying, pelletizing, and quality control. The right equipment depends on the polymer (PET, PE, PP, HDPE, PVC, EPS), the input cleanliness, and the target throughput.
What plastics recycling equipment actually means
When buyers search for plastics recycling equipment, they usually mean one of two things: a single machine that performs one stage (a shredder, a granulator, a pelletizer), or a complete recycling line that combines several machines into a continuous process. This article covers both — but the focus is on the line, because that is what determines whether a project becomes profitable.
A complete plastic waste recycling equipment line takes mixed or sorted plastic input (bottles, film, regrind, post-industrial scrap) and outputs material specs that buyers in the polymer supply chain will pay for — clean flakes, washed regrind, or pellets with controlled MFI (melt flow index) and moisture. Every stage in the line either adds value (cleaning, sizing, homogenising) or is a hidden cost (energy, water, labour). The job of selecting equipment is to minimise the second while protecting the first.
Key takeaway: Buying equipment one machine at a time almost always costs more than designing the line upfront. Capacity mismatches between stages create bottlenecks that throttle the entire line.
The six stages of a plastics recycling line
Almost every industrial plastics recycling system, regardless of feedstock, follows the same six stages. The equipment that fills each stage differs by polymer and input condition, but the sequence is consistent.
| # | Fáze | Zařízení | Co to dělá | Typical capacity (kg/h) |
|---|---|---|---|---|
| 1 | Pre-sorting & size reduction | Shredders, crushers, balers | Reduces incoming bales or bulky scrap to manageable pieces | 300 – 3,000 |
| 2 | Granulating | Granulators with screen sizes 8–20 mm | Converts shredded plastic into uniform flakes | 300 – 2,500 |
| 3 | Mytí | Friction washers, hot-wash tanks, sink-float separators | Removes labels, dirt, oils, food residue, and unwanted polymers | 500 – 4,000 |
| 4 | Sušení | Centrifugal dryers, thermal dryers, silo storage | Reduces moisture to <1% before extrusion | 500 – 4,000 |
| 5 | Pelletizing / extrusion | Single- or twin-screw extruders with degassing | Melts flakes and produces homogenous pellets with controlled MFI | 300 – 2,000 |
| 6 | Quality control & sorting | Metal detectors, eddy-current separators, NIR sorters | Removes metallic contamination and off-spec material before packaging | Full line throughput |
Stage 1 — Pre-sorting and size reduction
Every line starts here. A bale of post-consumer PET is too dense to feed directly into a washing tank; a single soft-drink bottle is too small to handle without reducing it to a controlled particle size. Drtiče — single-shaft for soft input like film, twin-shaft for mixed rigid input — reduce material to roughly 30–80 mm pieces. Output goes directly to the granulator unless the line includes a pre-wash step for very dirty feedstock.
Stage 2 — Granulating
Granulátory take the shredded output and produce uniform flakes (commonly 8–14 mm for PET, 10–16 mm for film). Screen size determines flake consistency and washing efficiency. Smaller flakes wash more thoroughly but cost more energy to produce and create more fines that are lost in downstream stages.
Stage 3 — Washing
Washing is the most expensive line in the budget after the pelletizer — and the most important. A weak washing stage is the single biggest reason recycled-plastic pellets sell at a discount. For PET bottles, a full hot-wash with caustic dosing removes glue residues from labels; for PE/PP film, friction washers remove agricultural soil and pesticide residue. Sink-float tanks separate PET (sinks) from PP/PE caps and labels (float) — this single separation can double the value of the output.
Stage 4 — Drying
Wet flakes destroy extruder output. PET in particular hydrolyses at extrusion temperature if moisture exceeds 50 ppm — the resulting IV drop makes pellets unsuitable for fibre or sheet applications. Centrifugal dryers handle bulk water removal; thermal dryers or vacuum hoppers bring the final moisture to spec.
Stage 5 — Pelletizing and extrusion
Ten/Ta/To extruder melts, filters, degasses, and re-forms the polymer. Twin-screw extruders are now standard for PET because the venting is needed to remove residual moisture and volatile contaminants. Single-screw extruders remain the workhorse for clean PE, PP, and HDPE regrind. Underwater pelletizing produces spherical pellets favoured by injection moulders; strand pelletizing produces cylindrical pellets favoured by fibre and sheet producers.
Stage 6 — Quality control
Metal detectors are non-negotiable — a single metal fragment can destroy an extruder screw worth tens of thousands of dollars. Eddy-current separators remove non-ferrous metal (aluminium foil from food packaging is the typical culprit). NIR (near-infrared) sorters identify polymer type at speed and reject off-spec material before it contaminates the output stream.
Choosing plastics recycling equipment by polymer
Polymer chemistry dictates almost every equipment decision. The same line cannot economically process PET and LDPE film without major reconfiguration. The table below summarises the equipment differences for the four most common industrial feedstocks.
| Polymer | Typical input | Critical equipment | Common output | Pitfall to avoid |
|---|---|---|---|---|
| PET | Post-consumer bottles, bottle flakes | Pre-wash, hot-wash with caustic, sink-float, thermal dryer, twin-screw extruder with venting | Bottle-grade pellets, fibre-grade pellets | Skipping caustic wash → glue residue → IV drop |
| PE / PP Film | Agricultural film, shopping bags, industrial film | Single-shaft shredder, friction washer, centrifugal dryer, densifier, twin-screw extruder | Recycled film pellets | Wet pellets — film holds water; under-drying ruins output |
| HDPE / PP Rigid | Drums, crates, automotive parts | Twin-shaft shredder, granulator, hot-wash, single-screw extruder | Rigid-grade pellets for blow moulding and injection moulding | Mixed polymer contamination — sink-float is mandatory |
| EPS / Polystyrene | Fish boxes, packaging waste | Densifier or compactor, granulator, single-screw extruder | Densified EPS ingots, GPPS pellets | Trying to ship low-density EPS — densification at source is non-negotiable |
Capacity sizing: matching equipment to throughput
Capacity quoted by manufacturers is rarely the capacity you get in production. The published figure is usually peak throughput with clean, dry, perfectly sized input — conditions that exist only in laboratory tests. Real-world capacity sits at 60–80% of nameplate, depending on input contamination and downtime.
A useful planning rule:
- Define the annual tonnage target (e.g., 6,000 tons/year of clean PET pellets).
- Convert to hourly throughput assuming 6,000 operating hours per year — in this example, 1,000 kg/h.
- Specify equipment with nameplate capacity 1.3× higher than required hourly throughput, so 1,300 kg/h.
- Size every upstream stage at least 1.2× the downstream stage — the pelletizer is usually the bottleneck and must never be starved.
Key takeaway: If your pelletizer runs at 80% utilisation while the washing line runs at 50%, you have over-spent on washing capacity. If the reverse, the pelletizer cannot reach its specification target. Match the line, then sell the pellets.
New vs used plastics recycling equipment
Used plastics recycling equipment is widely available — there is an active second-hand market for extruders, granulators, and washing lines. Below is an honest comparison; the right answer depends on the project stage and risk tolerance.
| Faktor | New equipment | Used equipment |
|---|---|---|
| Capex | Higher — full price plus installation | 30–60% of new price; older units 70–80% off |
| Dodací lhůta | 8–16 weeks for standard models | Available immediately if found |
| Záruka | 12–24 months, parts and labour | Typically 'as-is' or limited 30-day |
| Energetická účinnost | Current motor and drive efficiency | Older motors run 15–30% higher kWh per ton |
| Spare parts | Available from manufacturer for life of product | Risk of obsolete parts on 15+ year machines |
| Nejlepší pro | Long-term production, regulatory-sensitive output, food-contact | Pilot lines, secondary capacity, low-margin commodity output |
What to ask plastics recycling equipment manufacturers (RFQ checklist)
Most quote requests fail on either side because the spec is too thin. The checklist below is the minimum information a serious equipment manufacturer needs to give you a meaningful quote and a realistic timeline.
Input specification
- Polymer type(s) and percentage mix
- Form: baled, loose, granulated, washed/unwashed
- Contamination level: organic %, metal %, non-target polymer %
- Bulk density and particle size of incoming material
- Moisture content (especially for film and PET)
Output specification
- Target product: flakes, regrind, or pellets
- Target spec sheet: MFI range, IV (for PET), bulk density, colour, residual moisture
- End-use grade: food-contact (FCM-grade), fibre, packaging, injection moulding
- Pellet geometry and size if relevant
Throughput and operation
- Required tons per year, plus the operating hours/year assumed
- Number of shifts (1, 2, or 3)
- Space available — floor plan with dimensions
- Available utilities: kW connected, water flow rate, compressed air, steam
Commercial and after-sales
- Warranty terms in writing, with replacement-part lead time
- Installation supervision and operator training included or extra
- Service network in your region — on-site response time
- Reference customers with comparable polymer and throughput
Five costly mistakes when buying plastics recycling equipment
These are the mistakes our engineers see most often when retrofitting or rescuing recycling lines that have under-performed against business plans.
- Sizing the pelletizer first, then everything else. The washing stage is the value step. Size washing for input volatility, then match downstream capacity.
- Buying a generic line for a specific polymer. PET hot-wash equipment ruins PE film; LDPE friction washers cannot handle PET. Single-polymer dedicated lines outperform.
- Skipping the metal detector to save $8,000. A single metallic fragment can take a $250,000 extruder offline for two weeks. Always install upstream of the extruder.
- Under-sizing the drying stage. Drying is the cheapest stage to over-spec and the most expensive to fix later. Excess moisture damages every downstream component.
- Ignoring downstream offtake before commissioning. Equipment design is downstream of buyer specs. If the buyer wants 0.85 IV PET pellets, the line cannot be commissioned around a single-screw extruder.
Frequently asked questions about plastics recycling equipment
How much does a complete plastics recycling line cost?
A complete plastic waste recycling equipment line ranges from roughly $250,000 for a small EPS densifier setup to $3–5 million for a full PET bottle-to-pellet line at 2,000 kg/h. The single biggest cost drivers are the washing stage and the extruder configuration (single vs twin screw, vented vs unvented).
What plastic recycling equipment do I need to start?
The minimum viable line for any polymer needs five matched stages: shredding or size reduction, granulating, washing, drying, and pelletizing. Quality control sensors (metal detectors first, NIR sorters second) are technically optional but pay back inside 12–18 months for any line above 500 kg/h.
Is used plastic recycling equipment a good idea?
Used equipment makes sense for pilot lines, secondary capacity, and commodity-grade output where energy efficiency matters less than capex. It is a poor choice for food-contact, fibre-grade, or any regulatory-sensitive output where line uptime and traceability matter.
Jaký je rozdíl mezi plastovým drcičem a plastovým šrotovacími strojem?
A shredder reduces bulky input (bales, drums, large parts) to coarse pieces, typically 30–80 mm. A granulator takes those pieces and produces uniform flakes, typically 8–16 mm. Most industrial lines need both — a shredder upstream of a granulator. A few low-throughput lines combine them in a single machine called a granulator-shredder.
Can the same equipment process PET and PE/PP film?
Not economically. PET washing uses high temperatures and caustic dosing that would destroy PE film and damage equipment seals; PE film friction washers cannot generate the residence time needed to remove PET label adhesive. Build dedicated lines per polymer family, or accept significant changeover time and quality loss.
What output should a buyer expect from one ton of mixed plastic waste?
Yield depends heavily on input cleanliness. A well-sorted PET bottle bale yields 850–920 kg of bottle-grade pellets per ton (the rest is labels, caps, and process loss). A mixed post-consumer film bale yields 600–750 kg per ton because organic contamination and unwanted polymers must be removed. Pilot tests with your actual feedstock are the only way to forecast yield accurately.
Putting it together
Plastics recycling equipment is not a catalog purchase. The machines have to be matched to each other and to the polymer, the input quality, and the customer the output is being sold to. Specifying the line backwards from the output specification — what the buyer wants in their pellets — is the single discipline that separates profitable recycling operations from the ones that struggle.
Energycle designs and supplies industrial plastics recycling lines for PET, PE/PP fólie, HDPE/PP rigida EPS feedstocks, from 300 kg/h pilot capacity to multi-ton-per-hour production lines. If you are at the specification stage, we can review your input/output requirements and return a line configuration with capacity-matched components within five working days.
Next step: Request an equipment configuration and quote. Send us your input feedstock and target output spec — we will return a stage-by-stage proposal.
