Fournisseurs de machines de recyclage de film agricole

Agricultural plastic film is primarily LDPE or LLDPE (mulch film and greenhouse film) and LDPE or LLDPE/HDPE blends (silage stretch film). The key challenges that make agricultural film more difficult to recycle than industrial or packaging film are: high soil and sand content — mulch film used in the soil can carry 30–60% contamination by weight; wet and degraded condition — outdoor-weathered film is UV-degraded and brittle, generating more fines during size reduction; tangling — film pieces are long and prone to wrapping; very low bulk density — even after shredding, agricultural film flake is extremely light and difficult to convey and process in equipment designed for rigid plastic. Agricultural film recycling lines address these challenges through: a pre-cleaning trommel or drum washer to remove loose soil before size reduction; a wet granulator or film-specific shredder for size reduction in water; multiple friction washing stages with high water volumes; a float-tank for density separation; high-capacity centrifugal dewatering; thermal drying; and a pelletising extruder with a fine melt filtration system to remove residual mineral contamination.

Agricultural film washing lines are designed around the specific contamination level and film type. A line designed for lightly contaminated greenhouse or tunnel film will be insufficient for heavily soil-contaminated field mulch film. The critical stages are: pre-washing (trommel or drum) to remove loose soil — this stage alone may remove 20–40% of the input weight as mud and debris; wet size reduction — cutting film in water to prevent tangling and dust generation; multiple friction wash stages — typically 2–3 stages for heavily contaminated input; large-volume float separation tank — to separate residual soil and mineral contamination that sinks from floating PE film; high-capacity centrifugal dryer — sized for the very low bulk density of film flake (typically 4–8x the dryer volume capacity compared to a rigid plastic line of the same throughput in kg/hour); thermal drying; and an extruder with fine screen packs and a screen changer for pelletising. Water consumption is very high for agricultural film — 15–25 m³ per tonne of plastic processed is not unusual. A closed-loop water treatment system is essential.

Base the enquiry on representative feedstock sampled across seasons and collection routes. Record polymer types, film thickness, bale density, moisture, soil, stones, crop residue, twine, metal, labels, incompatible plastics, and the proportion of severely degraded material. State whether the required product is washed flake, densified material, or filtered pellet and define the intended downstream application. The request should give input and output measurement points, operating hours, acceptable residual contamination and moisture, expected yield method, water availability and quality, discharge constraints, power supply, fuel options, climate, site dimensions, and labour assumptions. Avoid specifying throughput only as kilograms per hour without agreeing whether it refers to wet dirty input, dry film input, clean flake, or saleable pellets.

Ask each supplier for a mass and water balance, process flow, equipment and motor list, utility schedule, layout, foundations and loads, tank volumes, water-treatment concept, control description, wear materials, screen-changing method, fume or dust controls, and boundaries for sludge handling. Request operating and maintenance manuals, electrical drawings, software backups, recommended commissioning and operating spares, and documentation required at the destination. A meaningful factory trial processes an agreed quantity of the buyer's mixed feedstock long enough to expose wrapping, blocking, water loading, dryer performance, and filtration behaviour. Define sampling and independent test methods for moisture, contamination, yield, and pellet properties before the trial. Video alone is insufficient when the feedstock, operating duration, measurement points, or discarded fractions cannot be established.

Compare complete installed scope rather than the price of the washer or extruder. Identify who supplies bale opening, sorting conveyors, metal removal, pre-wash, size reduction, friction washing, separation, dewatering, thermal drying, agglomeration, extrusion, filtration, pellet handling, water treatment, sludge removal, controls, platforms, guarding, and interconnecting conveyors and pipework. Separate freight, unloading, civil work, drainage, power distribution, water storage, installation labour, commissioning material, laboratory tests, training, and spares. Require guaranteed conditions for feedstock, throughput, output quality, yield, utility use, and operating availability, with an agreed remedy if acceptance criteria are missed.

Lead time includes feedstock testing, process design, drawing approval, manufacturing, trial, shipping, site preparation, installation, and commissioning. Clarify payment milestones and retain a milestone tied to successful acceptance where commercially possible. Evaluate references processing similarly dirty agricultural film, not clean post-industrial scrap. Discuss knife, screen, bearing, seal, centrifuge, and screw wear; cleaning access; routine labour; and wastewater support with operators. Confirm whether the supplier sends supervisors, how many local workers and lifting tools are needed, and who tunes the line after seasonal feedstock changes. After-sales comparison should cover remote diagnostics, technician response, control access, parts drawings, local component alternatives, and critical-spares stock. Common pitfalls include an undersized pre-cleaning stage, no plan for mud and sludge, optimistic output based on clean input, inadequate drying before extrusion, and no single party responsible for line-wide performance.