Labels and bottles fitted with them
AssigneeToyo Boseki Kabushiki Kaisha
InventorsNorimi Tabota, Tsutomu Oko, Teruo Kurosawa, Kuniharu Mori, Katsuhiko Nose, Hiroshi Shibano
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Abstract
A label having a thermoplastic polymer film and an ink layer formed on at least one surface thereof, the ink layer being removable in alkaline hot water, can easily be recycled after separated or without being separated from the bottle into polymer pellets with improved purity. The recycled polymer pellets are extremely suitable for the effective use of resources because they contain substantially no ink and can therefore find various applications.
Claims14
A label comprising a thermoplastic heat-shrinkable polyester film and an ink layer formed on at least one surface thereof, wherein the ink layer swells in alkaline hot water and is thereby removable in alkaline hot water by separation at the interface between the heat-shrinkable film and the ink layer arising from the heat shrinkage of the heat-shrinkable film, the ink layer exhibiting an ink removal ratio of 90% or higher, when a sample label of 1 gm in weight is cut into square-shaped flakes of 1 cm in each side and then stirred in 100 cc of 3% aqueous sodium hydroxide solution at 90° C. for 30 minutes, followed by washing and drying.
A label comprising a thermoplastic heat-shrinkable polyester film and an ink layer formed on at least one surface thereof, between which an intermediate layer that swells in alkaline hot water and is thereby removable in alkaline hot water is formed, the intermediate layer attaining an ink removal ratio of 90% or higher, when a sample label of 1 gm in weight is cut into square-shaped flakes of 1 cm in each side and then stirred in 100 cc of 3% aqueous sodium hydroxide solution at 90° C. for 30 minutes, followed by washing with water and drying.
Dependencies are inferred from the claim text.