Patent ID: 8590281

Claim:
A method for air-tightly containing in a rectangular film bag a flat product having at least one pair of parallel sides, comprising steps of: (i) inserting, within a clean room, the product into the bag in a manner such that one of the parallel sides of the product comes to a bottom end side of the bag, (ii) folding the bag over a line that runs equidistant from an open end side of the bag and the other one of the parallel sides of the product, (iii) folding the bag in a same direction as in the step (ii) over a line that runs equidistant from the line over which the bag has been folded immediately previously and the other one of the parallel sides of the product, thereby obtaining a folded bag, and this step being conducted at least one time, and (iv) consolidating the folded bag with an adhesive thereby preventing unfolding of the bag.