Thermally shrinkable laminate film for deep drawing, packaged article, and method for packaging of cheese

摘要

The invention has for its object to provide a heat-shrinkable laminated film for deep drawing, which has an increased carbon dioxide transmission rate (CO2TR) and an enhanced ratio (CO2TR/O2TR) of carbon dioxide transmission rate-to-oxygen transmission rate (O2TR), and is less susceptible to pinholes. In the inventive heat-shrinkable laminated film for deep drawing, a polyamide resin composition layer (a) containing a polyamide resin mixture comprising 60 to 95% by mass of an aliphatic polyamide resin (A) and 5 to 40% by mass of a polyamide base resin (B) having a heat of crystalline fusion of 5 to 40 J/g is laminated onto a heat-sealing resin layer (a) containing a polyolefin resin via an adhesive resin layer (b).

主权项

1. A heat-shrinkable laminated film for deep drawing, wherein a polyamide resin composition layer (a) containing a polyamide resin mixture comprising 60 to 95% by mass of an aliphatic polyamide resin (A) and 5 to 40% by mass of a polyamide base resin (B) having a heat of crystalline fusion of 5 to 35 J/g and a density of 0.95 to 1.10 g/cm3 is laminated onto a heat-sealing resin layer (c) containing a polyolefin resin via an adhesive resin layer (b), and the heat of crystalline fusion ΔHA of the aliphatic
polyamide (A) and the heat of crystalline fusion ΔHB of the polyamide base resin (B) satisfy the following condition (1):
ΔHA>ΔHB  (1), wherein said aliphatic polyamide resin (A) consists of only a nylon 6-66 or only a nylon 6-12, and wherein said polyamide base resin (B) is a polyamide/polyether block copolymer.