Plastic Recycling Washing Line

How Dirty the Material Is Decides the Whole Line

A plastic recycling washing line is specified from one number more than any other: how much of what arrives is not plastic. Clean in-house offcuts need rinsing; post-consumer agricultural film can carry 30 to 50 percent soil, moisture and organic matter by weight, and every stage after the feeder has to be sized for that load rather than for the nominal kg/h on the quotation. SUHUI builds washing plants for HDPE rigid packaging, PET bottles, PP jumbo bags and soft film. Film is the most common request: the PP PE film washing line runs 300–2,000 kg/h with float-sink density separation and brings agricultural and packaging film below 5 percent moisture. Washed flakes normally feed straight into a plastic pelletizing line, and material too large to feed the washer goes through a crusher or shredder first. As a factory-direct manufacturer we size the line from a material sample rather than from a capacity figure. Send photographs of the incoming bale and we will tell you which stages you need and which you can leave out. See delivered washing and pelletizing projects for real layouts and achieved output.

Machine Range

Products in This Washing Line Category

HDPE Rigid Milk Bottle Recycling Washing Line

The SUHUI HDPE rigid milk bottle recycling washing line processes post-consumer HDPE dairy packaging into clean HDPE flakes or optional recycled pellets through label and cap removal, shredding, hot alkaline...

PET Bottle Sorting Washing Line

The SUHUI PET bottle sorting washing line recycles post-consumer PET bottle bales into clean PET flakes through bale breaking, optical sorting, label removal, crushing, hot alkaline washing, float-sink separation, drying...

PP Jumbo Bag Recycling Washing Line

The SUHUI PP jumbo bag recycling washing line is a specialized system designed to recycle used polypropylene (PP) bulk bags, FIBCs (Flexible Intermediate Bulk Containers), and ton bags into clean,...

PP PE Soft Film Recycling Washing Line

The SUHUI PP PE soft film recycling washing line turns contaminated PP and PE film waste — agricultural mulch film, greenhouse covers, stretch wrap, LDPE/LLDPE packaging film — into clean,...

Selection Guide

Which Washing Line Fits Your Material?

Material / project situation	Recommended machine	Why it fits
HDPE milk bottles, drums and rigid packaging	HDPE Rigid Milk Bottle Recycling Washing Line	Rigid HDPE floats, so density separation removes caps and PET labels cleanly. The stages that matter are label pre-removal and hot washing to lift milk residue and adhesive; skip the hot stage and the flakes will smell, which is the first thing a buyer checks.
Post-consumer PET bottles for flake production	PET Bottle Sorting Washing Line	PET sinks and PVC sinks with it, so optical or manual sorting has to happen before washing rather than after. A few PVC bottles per tonne will scorch in the downstream extruder and show as black specks in the pellet.
Woven PP bags, FIBC and raffia sacks	PP Jumbo Bag Recycling Washing Line	Woven material traps whatever it carried and wraps around standard rotors. This line shreds first with anti-winding geometry, then washes; residue from the previous cargo, not the polymer, is what sets the number of wash stages.
PP and PE packaging film, agricultural film, LDPE scrap	PP PE Soft Film Recycling Washing Line	The heaviest-duty lane. Agricultural film arrives with soil and moisture at a third of its weight, so pre-washing, grit removal and multi-stage friction washers come before the density tank. Dewatering and drying capacity decide whether output reaches the sub-5 percent moisture a pelletizer needs.
Clean in-house production scrap	You may not need a washing line	Uncontaminated factory offcuts and purge can usually go straight to pelletizing. Buying a washing line for clean scrap adds water treatment, drying energy and a yield loss you do not need. Tell us the source of the material and we will say so.

Typical Washing Line Process Flow

01 Feeding Bale opener, belt conveyor and a metal detector. On post-consumer film the feeder also has to survive stones, wire and the occasional tool, which is why a magnetic separator here is cheaper than a damaged rotor later.
02 Shredding / crushing Reduces bales to a size the wash stages can carry. Size here is a compromise: smaller pieces wash more thoroughly but lose more material as fines through the dewatering screens.
03 Washing Pre-wash, friction washers and hot wash where adhesive or grease is present. This is where contamination is actually removed, and it is the stage most often under-specified when a line is quoted to a price rather than to a material.
04 Separation Float-sink density tanks and hydrocyclones. PE and PP float, PET and PVC sink. Density separation cannot split PET from PVC, so anything that matters has to be sorted before this point rather than after.
05 Dewatering Centrifugal or squeezing dewatering to get bulk water off. How much water leaves here sets the load on the dryer, and the dryer is the most energy-hungry unit in the line.
06 Drying Thermal or air drying to below 5 percent moisture for film, lower for PET. Residual moisture comes back as bubbles and voids in the pellet, so drying capacity is specified from the wettest material you plan to run, not the average.
07 Pelletizing or reuse Washed flakes go to a pelletizing line or are sold as flake. Flake sells for less but needs no further equipment; the decision is a business one and is worth making before the washing line is specified.

Contamination Level Sets the Configuration

This is the only real selection axis in washing. Two plants running the same polymer need different lines if their material arrives in different condition.

Clean in-house scrapUncontaminated offcuts and purge from your own production. Often needs no washing at all — a rinse and dewatering stage at most. If someone quotes you a full line for this material, ask why.
Lightly soiled packagingPost-industrial film and rigid packaging with dust and light printing. Pre-wash plus friction washing is enough. Cold water works; the hot stage is optional and adds running cost without adding much.
Post-consumer film and agricultural filmThe heavy case, and the most common enquiry. Soil, moisture and organic matter can be a third of the incoming weight. Needs grit removal, multiple friction washers, a hot wash and serious dewatering plus drying. Yield after washing is typically 60 to 75 percent, which has to be in your business case.
Greasy, oily or adhesive-laden materialLabels, tape and food residue. A hot wash with caustic dosing becomes mandatory rather than optional, and that decision brings water treatment with it.
Mixed post-consumer wasteSorting comes before washing. Density separation splits PE and PP from PET and PVC, but nothing in a washing line separates PET from PVC, so mixed streams need optical sorting upstream or the contamination passes straight through.

Send a photograph of the incoming bale with your enquiry, not just the polymer and the target output. A film line for clean post-industrial scrap and one for agricultural film differ by roughly a factor of two in price at the same kg/h, and the difference is entirely in the wash and dry stages.

Hot Wash or Cold Wash

The hot stage is the single most expensive option on a washing line to run, and about half of enquiries do not need it.

Wash stage

Cold Wash

Hot Wash

What it removes

ColdSoil, sand, dust and loose surface dirt through friction and water volume.

HotAdhesive, grease, oil, food residue and printing ink, usually with caustic dosing at 70–90 °C.

When you need it

ColdPost-industrial film, clean rigid packaging, agricultural film where soil is the only problem.

HotLabelled bottles, taped film, anything that held food or lubricant. Mandatory for HDPE milk bottles and most PET bottle lines.

Running cost

ColdWater and drive power only. The cheapest stage in the line to operate.

HotHeating is usually the largest single energy item, ahead of the dryer. Caustic is a consumable and a disposal cost.

Effect on output

ColdFlakes look clean but retain odour and adhesive residue if either was present.

HotRemoves odour, which is often what decides whether the flake sells at food-adjacent grade or as general recyclate.

Watch for

ColdSpecifying cold only, then discovering the buyer rejects the flake on smell.

HotCaustic water cannot go to drain. Adding a hot stage means adding water treatment, which is a second cost buyers often miss.

Decide this from what your buyer accepts, not from what the material looks like. Odour is the test most recyclate fails, and odour comes from residue a cold wash leaves behind. If you are selling into packaging rather than into pipe or pallets, budget for the hot stage.

Water Consumption and What Happens to It

Water is the running cost buyers ask about last and regret first. It also decides whether a plastic washing plant is permitted at all in some regions.

Fresh water make-up

0.5–3 m³/t

Recirculated

80–95%

Figures for a closed-loop line. Open-loop lines use several times more and are increasingly not permitted.

Stage	Water role	What ends up in it
Pre-wash and grit removal	Highest volume, lowest quality requirement	Soil, sand, stones. Settles out mechanically and is the easiest fraction to handle.
Friction washing	High volume, continuous exchange	Fine suspended solids and plastic fines. Needs filtration before recirculation or it abrasively wears pumps.
Hot wash with caustic	Lower volume, chemically loaded	Adhesive, grease, ink and dissolved caustic. This fraction cannot go to drain untreated and drives the treatment specification.
Density separation and rinse	Moderate volume, cleanest requirement	Light residual fines. Usually the easiest water to recirculate directly.

Ask for the make-up figure in cubic metres per tonne of output, not the total circulating flow. Circulating flow tells you the pump size; make-up tells you the water bill and the discharge permit. Closed-loop treatment is quoted separately from the washing line and is not a small line item on post-consumer film.

What Drives the Cost of a Washing Line

Material condition moves the price more than capacity does. Two lines at the same kg/h can differ by a factor of two.

Reference budget

$40,000–100,000

Throughput

300–1,000 kg/h

FOB, washing line only. Water treatment, pelletizing and material handling are quoted separately.

Material lane	Where it sits in the range	Why
Clean rigid packaging	Lower third	Few wash stages, cold water, modest dewatering. Capacity is the main variable.
HDPE bottles and PET bottles	Lower to middle	Hot wash and label removal are mandatory, but the material is dense and easy to convey and dewater.
Woven PP bags and FIBC	Middle	Anti-winding shredding ahead of washing, and stage count set by previous cargo residue rather than by the polymer.
Post-consumer and agricultural film	Upper third	Grit removal, multiple friction washers, hot wash, heavy dewatering and drying. Also the lane that needs the most water treatment.

Ask 01

Is water treatment in the price?On post-consumer film it is a substantial second purchase, not an accessory.

Ask 02

What yield should I expect?Agricultural film typically yields 60 to 75 percent. A quotation in kg/h of input tells you nothing about saleable output.

Ask 03

What moisture does it reach?Below 5 percent for film, lower for PET. Anything higher and the pelletizing stage will not hold quality.

Cross-category price ranges for shredding, pelletizing and complete lines are on the plastic recycling machine overview. Exact figures depend on material condition and output and are confirmed with the quotation.

Before You Ask

What to Send Before Requesting a Quote

To receive a more accurate recommendation, send your material type, material form, contamination level, required capacity, target output, plant space, local voltage and destination country. Material photos or videos are also helpful.

Material type: PET, HDPE, PP, PE, PVC, ABS, PS or mixed plastic
Material form: bottle, film, bag, pipe, lump, profile, flake, pellet or powder
Material condition: clean, dirty, wet, oily, labeled, baled or loose
Target output: flakes, pellets, pipe, profile or finished product
Capacity requirement: kg/h or tons/day
Destination country and voltage
Existing equipment, if any

Request a Washing Line Recommendation

Tell us your material and target output. We reply with practical recommendations, not generic sales replies.

Frequently Asked Questions

What materials can a plastic washing line process?

SUHUI washing lines process PET bottles, HDPE bottles and rigid packaging, PP jumbo bags, woven bags and PP/PE films. The configuration is matched to material form and contamination level.

Do I need washing before pelletizing?

If the material is dirty, oily or printed, washing is usually needed before pelletizing. Clean factory scrap can often go directly to a pelletizing line.

Can one washing line handle different plastics?

A washing line is normally configured for one material family. Some stages can be shared, but mixing very different plastics in one line usually reduces output quality.

What information is needed for a washing line quote?

Send your material type and form, contamination level, required capacity, target output, plant space, local voltage and destination country. Material photos or videos help.

How much does a plastic recycling washing line cost?

A washing line typically runs USD 40,000 to 100,000 FOB for 300 to 1,000 kg/h. Position inside that range is set more by material condition than by capacity: clean rigid packaging sits at the bottom, bottle lines with a hot wash in the middle, and post-consumer or agricultural film at the top because it needs grit removal, multiple friction washers and heavy drying. Water treatment is quoted separately and is a substantial second item on film lines.

Do I need a hot wash or is cold washing enough?

Cold washing removes soil, sand and loose dirt. A hot wash with caustic dosing at 70 to 90 degrees is needed for adhesive, grease, food residue and printing ink, which means it is effectively mandatory for labelled bottles and taped film. Decide from what your buyer accepts rather than from how the material looks, because odour is the test most recyclate fails and odour comes from residue a cold wash leaves behind. Adding a hot stage also means adding water treatment.

How much water does a plastic washing line use?

A closed-loop line consumes roughly 0.5 to 3 cubic metres of fresh make-up water per tonne of output, recirculating 80 to 95 percent. Open-loop lines use several times more and are increasingly not permitted. Ask suppliers for make-up water per tonne rather than total circulating flow, because circulating flow only tells you the pump size while make-up tells you the water bill and the discharge permit.

What yield should I expect from a washing line?

Yield depends almost entirely on how dirty the input is. Clean post-industrial scrap loses only fines, while post-consumer agricultural film typically yields 60 to 75 percent because soil, moisture and organic matter can be a third of the incoming weight. A quotation expressed in kg/h of input tells you nothing about saleable output, so confirm which end of the line the figure refers to.

Can a washing line separate PET from PVC?

No. Density separation splits floating PE and PP from sinking PET and PVC, but PET and PVC both sink and cannot be separated hydraulically. PVC has to be removed by optical or manual sorting before washing. A few PVC bottles per tonne will scorch in the downstream extruder and appear as black specks in the pellet, which is why a PET washing line puts sorting ahead of washing rather than after it.