Short answer
They can. A sleeve covering most of a bottle is what the sorting machine sees, so the bottle may be identified as the sleeve's plastic or, if the sleeve is printed, as a coloured bottle. Whether it sorts correctly depends on how much of the bottle the sleeve covers, what the sleeve is made of and its density, how heavily it is printed, and whether it is designed to come off.
A shrink sleeve gives full 360-degree graphics, lets a single clear or natural bottle carry any colour scheme, and can make a clear bottle look opaque or coloured without adding pigment to the resin. From a colour perspective that is attractive for recycling: a clear bottle under a coloured sleeve could, in principle, give clear recyclate once the sleeve is removed. The problem is that sorting happens before the sleeve is removed, and the sorting sensors only see the outside.
NIR sorters read the surface they are pointed at. Under a sleeve covering most of the bottle, they read the sleeve's polymer; if that is not PET, a PET bottle may be classed wrongly or rejected. A colour camera sees the sleeve's print, so a clear bottle under a coloured sleeve can be diverted into the coloured PET fraction. APR's PET guidance notes both effects and sets its preferred label coverage by container size, measured on the side wall and shoulder: up to 55% for containers of 550 ml or less and up to 75% for larger ones. RecyClass uses similar size-based coverage bands for non-PET surfaces.
Guidance offers several routes to a sleeve that does not spoil sorting. Keeping coverage within the preferred limits leaves enough bare bottle for the sensors. Choosing a sleeve that floats in water — polyolefin films with a density below 1 g/cm³ — means that even if it stays on through sorting, it separates from PET flake in the float–sink tank; sleeves denser than water (PVC, PS, PETG) sink with PET and contaminate it. European guidance treats full sleeves that remain translucent to NIR as a limited option, and both EPBP and RecyClass list twin-perforated sleeves, designed to be torn off mechanically before sorting, as an interim option. APR describes specific perforation patterns for thin crystallisable PET sleeves above the coverage limit.
Even a sleeve of the right material can defeat the sorter if it is heavily inked or metallised. European guidance lists sleeves that hinder recognition of the underlying PET — too large, metallised or heavily inked — as not compatible with the clear bottle stream, and dense inks can also bleed colour into wash water if the sleeve reaches the washing stage. For a designer, that means the colour strategy on a sleeve is not only a graphics question: large dark solids and metallic effects covering most of the bottle have a recyclability cost that a lighter design with some clear window does not.
| Sleeve choice | What sorting sees | Recyclate effect | Trade-off |
|---|---|---|---|
| Partial sleeve within coverage limit | Bare PET and its colour | Clear stream if bottle is clear | Less graphic area |
| Full sleeve, floating polyolefin film | May read sleeve, not PET | Separates in float–sink if sorted | Sorting risk remains |
| Full sleeve, NIR-translucent | PET through the film | Limited compatibility | Material constraints |
| Twin-perforated sleeve | Bottle, after sleeve removal | Interim option in guidance | Perforation visible |
| Dense sleeve (PVC, PS, PETG) | Sleeve polymer | Sinks with PET, contaminates | Avoid for PET |
| Heavily inked or metallised full sleeve | Colour or metal | Mis-sorting, possible ink bleed | Use a lighter design |
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
ConventionModerate evidence· North America
APR guidance prefers label or sleeve coverage of no more than 55% of the side wall and shoulder for PET containers of 550 ml or less and no more than 75% for larger containers, noting that non-PET labels above this may interfere with NIR detection and cause a clear bottle to be sorted as coloured.
Caveat: The guide is revised periodically; check the current figures before relying on them.
Source: APR Design Guide for Plastics Recyclability: PET Rigid
ConventionModerate evidence· Europe
European guidance rates PE, PP and OPP sleeves with density at or below 1 g/cm³ as compatible with clear PET bottles, treats full sleeves translucent to NIR and twin-perforated sleeves as limited or interim options, and rates sleeves denser than water or that hinder recognition of the PET as not compatible.
Source: RecyClass Design for Recycling Guidelines: Transparent Clear & Light-Blue PET Bottles; Design Guidelines for PET bottles
ConventionModerate evidence· Europe
RecyClass guidance for clear PET bottles indicates non-PET surface coverage of up to 70% for containers over 500 ml and up to 50% for containers of 500 ml or less.
Caveat: Stated in a footnote that also allows a sorting evaluation in place of the coverage band.
Source: RecyClass Design for Recycling Guidelines: Transparent Clear & Light-Blue PET Bottles
Reviewed 29 September 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.