Build a return-bottle condition map before washer trials
A returnable-bottle washer should be assessed against the mix of bottles arriving at the site, not only against a recently emptied clean sample. Separate the incoming material into recognisable conditions: intact bottles with removable labels, dried product residue, strongly bonded labels or adhesive, and bottles that should be rejected before washing. Record approximate proportions from actual deliveries rather than assuming every return is alike.
Choose trial samples from those groups and keep their history identifiable. Ask the washer supplier which conditions the proposed process is intended to handle and which must be removed upstream. Label removal, residue removal and final inspection should each have a defined outcome. A clean-looking exterior can coexist with internal residue, and removing the label does not show that adhesive has been removed adequately for subsequent labelling.
The site layout also needs a route from dirty-bottle reception to cleaned-bottle discharge that avoids mixing the two streams. Include reject handling, removed labels, drainage, access for cleaning and the transfer to the filler in the review. Returnable washing is a staged process; additional equipment or handling may be necessary around the washer itself. Approve the complete workflow against the quality requirements for the intended reuse.
Which bottles should be supplied for returnable-washer trials?
Use traceable examples of normal returned conditions, including difficult residues and labels, plus agreed reject examples kept separate from acceptable trial stock.
Does successful label removal prove a bottle is ready to refill?
No. Residue, adhesive, bottle integrity and the required cleaning outcome still need their own checks before release to filling.
Plan label removal · Assess cleaning after de-labelling
