The label system is part of the washing specification because face stock, glue, age and storage conditions determine whether labels release cleanly or create residue and waste problems.
A reusable-bottle process can fail even when the bottle itself is suitable because the label tears, the adhesive smears, film remains intact or detached material blocks filters and nozzles. The machine trial should therefore identify the face stock, adhesive and storage condition of every sample group.
Do not approve a setting against an unmarked mixture of labels.
| Variable | Why it matters | Trial record |
|---|---|---|
| Face stock | Paper can break into fibres; film may stretch, tear or remain intact | Material, thickness or supplier reference where known |
| Adhesive | Water response, cure and tack influence residual glue | Adhesive reference or best available description |
| Coverage and shape | Full wraps, neck labels and overlapping edges change removal load | Photograph and labelled area |
| Age and storage | Heat, moisture and time can change face stock and adhesive behaviour | Application date or age range and storage condition |
| Bottle surface | Embossing, coatings, scuffing and residue can hold glue or label fragments | Bottle format and condition |
Detached label material should leave the process instead of circulating through tanks, pumps, nozzles and later rinse stages. Screens, filters or collection points need sufficient access for cleaning and a safe method for handling wet paper, film and adhesive residue.
The site should also consider how label waste and wash water affect its drain or trade-effluent arrangements. The exact requirement depends on local consent and the final process.
Changing temperature or chemistry may alter label release, but it can also affect bottle material, machine materials, operator exposure, rinsing demand and effluent. Any change must be developed with competent chemical and site safety input. Where the label is intended for a reuse loop, selecting a compatible label and adhesive can be more robust than forcing the washer to recover an unsuitable combination.
Each answer states the decision first, then explains the evidence and limitations that change it.
The same label can behave differently after storage because adhesive cure, moisture, heat, pressure, product spills and time can change bond strength and face-stock condition.
Include samples from the real return ages and storage conditions. A recently labelled laboratory bottle may not represent a bottle returned months later.
Film labels are not universally harder than paper labels, but they fail differently. Film may remain intact, stretch or carry adhesive, while paper may soften, tear and load filters with fibres.
The correct comparison uses the actual face stock, adhesive, coverage and process conditions. Avoid a general material ranking without a sample trial.
Wash chemistry may improve removal of some adhesives, but it should not be assumed to compensate safely for an unsuitable label system. Higher concentration or temperature can create bottle, machine, rinse, safety and effluent consequences.
Develop chemistry with the supplier and site COSHH assessment, and compare whether a reuse-compatible label specification is the more robust solution.
Send labelled bottle samples or clear photographs, face-stock and adhesive information where known, label age, storage condition, coverage, bottle dimensions, expected output and the acceptable residual-glue condition.
Identify each sample group. If several suppliers or label batches exist, include the variants rather than assuming one example represents the population.
Use the next guide that matches the unresolved process, equipment or acceptance question.
Continue with the related bottle-washing guidance for the next project decision.
Continue with the related bottle-washing guidance for the next project decision.
Continue with the related bottle-washing guidance for the next project decision.
Send bottle photographs or samples, dimensions, incoming condition, required result, target output, utilities and the surrounding line so Lancing can assess the appropriate route.
Request a project-specific review