METHOD FOR SELECTING POLYESTER FILM, METHOD FOR PRODUCING LAMINATE, METHOD FOR PRODUCING PACKAGE, AND LAMINATE

• Main Authors: KUDO SHIGEKI, KADOYA HARUNA, OGAWARA KENJI
• Format: Patent
• Language: English; Japanese
• Published: 10.12.2020
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; 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; HANDLING THIN OR FILAMENTARY MATERIAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; TRANSPORTING

To provide a method for selecting a polyester film used as a sealant layer, which can obtain a laminate capable of achieving both excellent filling suitability and strength as a packaging material even when the packaging material is mainly composed of the polyester film.SOLUTION: A polyester film is used as a sealant layer in a laminate comprising a base layer 1 containing a crystalline polyester film, an adhesive layer 2 and a sealant layer 3 in this order. A method for selecting a polyester film includes the steps of: subjecting a polyester film to an FT-IR analysis by a reflection method to measure a crystallinity of the polyester film from the following formula; and selecting a first polyester film having a crystallinity of 2 to 15%. I1409=p1×I1340+p2×I1370...(expression 1). Crystallinity[%]=p1×(I1340/I1409)×100...(expression 2).SELECTED DRAWING: Figure 1 【課題】ポリエステルフィルムを主構成とする場合であっても、包材としての優れた充填適性及び強度を両立可能な積層体を得ることができる、シーラント層として用いられるポリエステルフィルムの選定方法の提供。【解決手段】ポリエステルフィルムが、結晶性ポリエステルフィルムを含む基材層１、接着層２及びシーラント層３をこの順に備える積層体におけるシーラント層として用いられ、ポリエステルフィルムに対して反射法によりＦＴ−ＩＲ分析を行い、下記式より上記ポリエステルフィルムの結晶化度を測定する工程と、結晶化度が２〜１５％である第一のポリエステルフィルムを選定する工程と、を備えるポリエステルフィルムの選定方法。Ｉ１４０９＝ｐ１×Ｉ１３４０＋ｐ２×Ｉ１３７０・・・（式１）。結晶化度［％］＝ｐ１×（Ｉ１３４０／Ｉ１４０９）×１００・・・（式２）。【選択図】図１