An inner liner helps in three cases: the product is exposed and will touch the box surface, the primary pack may leak, or meltwater will form with the load. A liner separates the product from the box surface, limits a small liquid leak and makes unloading easier; if it tears or gets trapped in the lid, both protection and closure suffer.
Trial the liner in a loaded box, not an empty one, and look at:
- Does a fold at the base form a water pocket? A large bag laid flat in an empty box folds at the bottom once product goes in; if water gathers there, the box looks dry outside while the packs underneath get wet.
- Does the liner's edge run into the closing line?
- When unloading, does collected liquid pass over the packs?
Closure depends on the product: where respiration, moisture release or cold-air circulation matters, tying the mouth tightly creates a new risk, so follow the product's pack-out instruction.
The liner's suitability for food contact is proved by paperwork: under Article 14 of the Turkish Food Codex Regulation on Materials and Articles in Contact with Food a written declaration of compliance is prepared, and under Articles 13 and 15 the producer or importer details and traceability are present. An unlabelled bag found in the warehouse is not an approved substitute.
