| 摘要 |
PROBLEM TO BE SOLVED: To extremely smoothly peel a lid member without being torn when the lid member is peeled from a tray container by a method wherein a biaxially drawn synthetic resin film wherein a difference of a heat shrinkage rate in two directions at specified angles to the right and the left based on the mechanical direction, is within a specified value, is used as the raw material. SOLUTION: A biaxially drawn polyamide film wherein a difference of a heat shrinkage rate in two diagonal directions, i.e., a difference of a heat shrinkage rate in the direction at 45 deg. to the left based on the mechanical direction, and a heat shrinkage rate in the direction at 45 deg. to the right based on the mechanical direction, is 3% or less, is used as the raw material for a lid member 3. Then, a content is housed in a tray container 1, and the lid member 3 is placed in such a manner that the heat-bonding layer may become on the tray container side, and the edge 2 of the tray container 1 and the lid member 3 are easily openably heat-sealed, i.e., two lines of heat-sealing lines are applied, and for other places, an embossing is applied, and heat-sealing is performed. By this method, for the tray container 1, the lid member 3 can be extremely smoothly peeled from the edge 2 of the tray container 1. |
