FILM FOR HEAT-SHRINKABLE POLYPROPYLENE BASE SHRINK LABEL

• Main Authors: SEZUME TADASHI, KANAI GEN, TAYANO TAKAO
• Format: Patent
• Language: English
• Published: 03.09.2002
• Edition: 7
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; ADVERTISING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LABELS OR NAME-PLATES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; PHYSICS; SEALS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SIGNS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To improve the heating shrinkage characteristics, in particular, the low temperature shrink characteristics and accomplish the low specific gravity. To provide a film for heat-shrinkable polypropylene for shrink label is excellent in balancing of shrink packing property and recycling efficiency and the elastic modulus in tension. SOLUTION: In this film for heat shrinkage polypropylene shrink label, a film for shrink label is characterized in consisting of plastic film for polypropylene shrink label, preferably crystalline propylene α-olefin random copolymer having the special properties, the shrinkage percentage of the main shrinkage direction satisfies equations 1 to 3, and the specific gravity is not greater than 0.94 and the shrinkage percentage in the main shrinkage direction for seven days at 40 deg.C is less than 3%. 1.Equation 1: S80 >251d-215 2.Equation 2: S90 >531d-462 3.Equation 3: S100 >627d-541 Where S80 , S90 and S100 indicate the shrinkage percentages (%) in the main shrinkage direction when in water bath for 10 seconds at 80 deg.C, 90 deg.C, and 100 deg.C respectively, and d the film specific gravity.