Plastic Baling for Recycling: Processing Film, Bottles, and Rigid Plastic

By:     Kieran Donnelly

Plastic Waste Is Not a Single Material

The phrase “plastic waste” encompasses dozens of materially distinct polymer types with varying processing requirements, recyclers, and commodity values. A business that treats all its plastic as a single stream misses the commercial value differences between types and risks producing bales that no recycler wants because of contamination or grade mixing.

Understanding plastic waste as a collection of distinct material streams, each with its own handling requirements and commercial outcomes, is the starting point for effective plastic baling. The three main commercial plastic streams that generate the most volume in UK businesses and that are most commonly baled are plastic film, plastic bottles (PET and HDPE), and rigid plastic packaging.

Gradeall manufactures balers for plastic processing applications from its facility in Dungannon, Northern Ireland. The vertical baler range, including the GV500, G-ECO 500, G-ECO 250, and the multi-materials baler, covers the full range of plastic baling applications. With nearly 40 years of manufacturing experience and equipment in over 100 countries, Gradeall’s balers are used across retail, logistics, manufacturing, and waste-management plastic-processing operations.

Plastic Film: The Highest-Volume Commercial Plastic Stream

Plastic film, encompassing stretch wrap, shrink wrap, polythene bag outers, polythene sheet, and pallet wrapping, is the dominant plastic waste stream by volume in distribution, retail, and manufacturing operations. A busy distribution centre may use tonnes of stretch wrap per week on outbound pallets and receive even larger quantities in polythene film on inbound deliveries.

Why plastic film baling makes commercial sense. Clean, segregated plastic film bales have genuine commodity value in the recycled plastics market. Film recyclers process the baled film into recycled polyethene pellets used in the manufacture of new film, refuse sacks, and plastic lumber products. The market for clean film is more consistent than for mixed or contaminated plastics.

The contamination challenge. The greatest threat to the value of plastic film is contamination. Film that have been on the floor, in contact with food waste, heavily labelled, or mixed with other plastic types produces bales that recyclers discount or refuse. Establishing a clear operational rule about which film is acceptable for baling (internal pallet wrapping and polythene outers, dry and clean) and which goes to general waste (food-contaminated film, heavily soiled material) is the critical quality management step.

Baling film effectively. Plastic film is bulky in its loose form because it traps significant air between layers. Effective baling requires the film to be pushed down into the baler chamber as it loads, expelling trapped air before the ram compresses the load. Large pieces of stretch wrap should be folded or loosely wound to allow air to escape during loading. The G-ECO 500 and GV500 produce dense film bales that are commercially well-received by film recyclers.

PET Bottles and HDPE Containers: High-Value Rigid Plastics

PET (polyethene terephthalate) clear bottles from beverages and HDPE (high-density polyethene) containers from cleaning products, dairy packaging, and industrial applications are among the most valuable plastic streams from commercial operations.

PET bale value. Clear PET bales from clean, segregated commercial sources are consistently purchased by recyclers who process them into recycled PET (rPET) for new packaging manufacture. The food-grade rPET market has grown significantly as brand owners commit to recycled content in their packaging. Clean, clear PET from commercial operations commands good prices.

HDPE bale value. Natural (undyed) HDPE commands premium prices as a clean, easily recyclable stream for pipe, container, and packaging manufacture. Coloured HDPE has a lower value than natural HDPE because colour mixing in recycling produces a grey or discoloured product with limited end-use applications. Keeping natural and coloured HDPE separate from each other and from other plastics maximises value.

Preparation for baling. Bottles should be emptied and, where possible, lightly crushed to remove air before loading. Labels do not need to be removed; recyclers process labels as part of the recycling operation. Caps are acceptable in most bottle baling operations; confirm with your specific recycler.

Volume threshold. PET and HDPE baling makes commercial sense when bottle volumes are sufficient to fill bales at a reasonable frequency (at least one bale per week for most recycler collection arrangements). Below this threshold, bottles can be placed in mixed plastic collections; above it, segregated baling produces better returns.

Rigid Plastic Packaging: The More Challenging Stream

Rigid plastic packaging other than bottles (trays, tubs, film-lidded containers, pots, and mixed rigid packaging) poses a more complex baling challenge because it comprises multiple polymer types, is often contaminated with food residue, and has less-developed recycling markets than film and bottles.

Grade sorting matters. Mixing PP (polypropylene) food trays with PE (polyethene) containers and PS (polystyrene) pots produces a mixed-polymer bale that most recyclers cannot process economically. The sorting required to produce single-polymer bales from rigid packaging may not be operationally viable for many commercial operations.

Contamination from food residue. Rigid packaging from food service, retail, and catering operations typically has food residue that requires washing before recycling. Recyclers of post-commercial rigid plastic often require food-free material; contaminated bales are rejected or heavily discounted.

When to bale rigid plastic. The practical conditions for commercially viable rigid plastic baling are: sufficient volume of a reasonably consistent polymer type, food residue manageable through rinsing at source, and a local recycler who accepts the specific material. Food manufacturers producing large volumes of clean polypropylene tray waste, for example, may have a commercially viable rigid plastic baling programme. Mixed post-consumer-style rigid plastic from a retail operation is less likely to find a buyer at a paying price.

Choosing the Right Baler for Plastic Streams

Different plastic streams have different baling requirements, and choosing equipment matched to the primary stream is important for producing commercially acceptable bales.

For film and stretch wrap. A machine with a large chamber volume (to accommodate bulky loose film), adequate compaction force to compress film to commercially required density, and reliable tying to keep the compressed film from expanding after ejection. The G-ECO 500 and GV500 are well-suited to high-volume film applications.

For bottles (PET and HDPE). Bottles require a higher compaction force per unit volume than film because their rigid walls resist compression more than film’s flexible walls. A machine with adequate force specification for bottle compression and appropriate chamber dimensions for bottle loading produces consistent, dense bales.

For multi-stream operations. Operations baling both film and bottles, or film and cardboard, benefit from the multi-materials baler that processes different streams sequentially in a single machine, or the twin-chamber baler that runs two streams simultaneously.

The UK Extended Producer Responsibility (EPR) Context

The UK Government’s Extended Producer Responsibility for packaging, fully implemented from 2025, places financial responsibility for the end-of-life management of packaging waste on the producers who place that packaging on the market. Under EPR, businesses above the threshold pay fees that fund the collection and recycling of packaging waste from households and businesses.

For commercial plastic waste generators, EPR changes the economics of recycling in two ways. First, it increases the regulatory and financial incentives to document and maximise the recycling of packaging waste generated in commercial operations. Second, it funds recycling infrastructure development that improves collection options and, potentially, the prices available for commercial plastic recyclables.

Businesses with Producer Responsibility obligations should work with a registered compliance scheme and ensure their waste management documentation reflects accurate recycling rates. Baled plastic collected by a licensed recycler and taken to an approved reprocessor generates the documentation chain that compliance schemes require for reporting.

“Plastic baling is where we see the most questions about whether the commercial case stacks up,” says Conor Murphy, Director of Gradeall International. “For film, the case is clear at reasonable volumes. For bottles, it depends on volume. For mixed rigid, it’s genuinely application-specific. We help customers work through which of their plastic streams has a viable baling case and which is better managed through alternative routes.”

Contact Gradeall International for guidance on plastic baling specifications and to discuss which streams in your operation warrant a dedicated baling programme.

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