Meaning
Granulated post-consumer thermoplastic packaging represents a primary feed stream for recycled polymer processing. Clean bottle flake is produced by shredding, washing and sorting used beverage containers, yielding a raw material suitable for extrusion. It replaces virgin resin in various sheet and thermoforming applications.
The physical properties of this material depend heavily on the sorting efficiency and wash quality of the recycling facility.
Material Sorting
Contamination from caps, labels and adhesives reduces the quality of the recycled stream. When bottle flake contains trace amounts of polyvinyl chloride or polyolefins, it degrades rapidly during subsequent thermal processing. Optical and density separation steps must remove these foreign materials before pelletizing.
Cleanliness directly affects the colour and clarity of the recycled resin.
Moulding Challenge
Inconsistent melt flow rate complicates the injection moulding of recycled polyester. Processors using bottle flake must adapt to variable rheological behaviour. Injection pressure adjustments are necessary to avoid moulding defects.
This material requires specialized filtration to remove solid contaminants.
Economic Value
Procurement costs for recycled flakes are lower than those for virgin resins. Using bottle flake improves the environmental footprint of packaging lines and satisfies legislative recycling mandates. However, the cost of drying and filtering this material offset some of these raw material savings.
Processors must calculate the total cost of ownership, including scrap rates and tool wear, to determine the true profitability of using recycled content.
