HEAT-SHRINKABLE PACKAGING MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide heat-shrinkable packaging material, which can highly precisely separate from PET by a liquid specific gravity separating method even under the state having an ink coating film layer formed thereon.

SOLUTION: This packaging material includes a single-layered or multi-layered heat-shrinkable film and the ink coating film formed on at least one side of the heat-shrinkable film. The heat-shrinkage factor (under the immersion of hot water of 80°C for 10 seconds) in at least one direction of the packaging material is at least 20% and the ratio of the thickness (da(μm)) of th heat-shrinkable film by the thickness (db(μm)) of the ink coating film satisfies an equation; da/db=nY, wherein Y=(pb-1.05)/(1.05-pa) and n≥2, pa(g/cm3) is the density of the heat-shrinkable film at 23°C (measured according to JIS K 7112) and is less than 1.05 and pb(g/cm3) is the density of the dry ink coating film at 23°C and is at least 1.05.

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