LDPE LLDPE薄膜清洗设备供应商
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LDPE and LLDPE film washing — input streams and contamination
LDPE and LLDPE film comes from several distinct collection streams, each with different contamination characteristics. Post-industrial LDPE/LLDPE: trim rolls, off-specification production, stretch wrap from manufacturing facilities, and pallet wrap from logistics operations. This stream is typically clean, consistent, and can be processed with minimal washing. Post-commercial LDPE/LLDPE: collected from supermarkets, distribution centres, and retail operations — shrink film, stretch wrap, carrier bags. Contamination includes food residues, label adhesives, and some soil. Requires friction washing but typically does not need hot wash. Post-consumer LLDPE/LDPE: carrier bags, food packaging film, mixed film packaging from household collection. Highest contamination — food residues, inks, adhesives, contamination from mixed collection. Typically requires hot wash for acceptable output quality. The washing plant design must be matched to the input stream. A line designed for clean post-industrial film will be under-specified for post-consumer household film collection. Confirm the input stream specification with the machinery supplier.
Typical LDPE/LLDPE film washing plant configuration
A standard LDPE/LLDPE film washing plant for commercial-grade input includes: a bale breaker or pre-shredder (for baled input material); a wet granulator cutting film in water (typically to 20–40mm flake); a pre-wash trommel or drum screen to remove loose contamination; a friction washer (one or two stages); a rinsing tank; a float-sink separation tank; a centrifugal dryer; and a thermal dryer or friction dryer. For heavily contaminated post-consumer input, add a hot wash tank between friction washer stages and a second friction washer. For pelletising output (rather than clean flake), a degassing single-screw or twin-screw extruder with fine melt filtration and underwater pelletiser completes the line. Output specification for recycled LDPE/LLDPE pellets from a well-operated commercial line on clean post-industrial material can achieve contamination below 100 ppm, moisture below 0.3%, and consistent MFI within a narrow range. Post-consumer material output typically achieves 200–500 ppm contamination with good process management.
Frequently asked questions
What applications use recycled LDPE and LLDPE film pellets?
Recycled LDPE pellets (natural or grey) are used in blown film lines producing refuse sacks, agricultural film, construction sheeting, and protective packaging films. Recycled LLDPE pellets are used in stretch wrap production (at 30–60% blend with virgin for standard applications) and for blown film for secondary packaging. Black rLDPE (compounded with carbon black for UV resistance) is used for construction sheeting, tree nursery bags, and outdoor protective films. The application determines the acceptable contamination level, colour specification, and MFI range for the recycled pellet.
Can LDPE and LLDPE film be processed on the same washing line?
Yes — LDPE and LLDPE have similar density, similar melting points, and process well together in the same washing line. They both float in water, so density separation within the line does not separate them. Mixed LDPE/LLDPE pellets are commercially accepted for most film applications. If mono-material LDPE or LLDPE output is required, input pre-sorting by film type is needed — NIR sorting can distinguish LDPE from LLDPE, but this is not commonly available in film sorting facilities.
What is the difference between a LDPE film washing line and a rigid HDPE washing line?
LDPE film washing lines are specifically designed to handle flexible, low-bulk-density film material — with wet granulators, high-volume conveyors, and film-specific friction washers. Rigid HDPE washing lines handle granulated HDPE bottle or pipe material — denser, more free-flowing, and requiring different machine configurations. You cannot use a rigid plastic washing line to process LDPE film effectively — the machines will jam or produce poor output. Confirm the machine design is specifically suited to your material type.
What certifications should I look for in an LDPE film washing plant supplier?
ISO 9001 certification for the manufacturer is a baseline quality indicator. CE marking on individual machines (for EU buyers) confirms machinery directive compliance. Beyond certifications, prioritise: references from operating customers with similar input streams; willingness to provide process guarantees (output contamination specification, throughput); and availability of after-sales service in your region. A manufacturer who can demonstrate operating LDPE film washing lines at similar scale and contamination level to your project is more valuable than one with certificates but no comparable track record.
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