Method for producing packing sheet with improved insulation and storage properties

A method for producing a packing sheet with improved insulation and storage properties, the method comprising:

• producing a cap packing sheet comprised of a formed film on which convex ridges are formed at a regular interval in a direction from a front side to a rear side thereof and in which a fluid is injected into the ridges and into a space formed between each of the ridges, a lower film having auxiliary check valves provided at an upper surface thereof at a regular interval and being attached to a lower side of the formed film in a state in which each of the auxiliary check valves is disposed in a respective opening of a first end of each of the ridges of the formed film along a first edge of the cap packing sheet, thus sealing the ridges of the formed film, and an upper film attached onto the sealed ridges of the formed film;
• cutting the cap packing sheet along a second edge thereof such that second ends of the sealed ridges of the cap packing sheet are opened;
• passing the cut cap packing sheet which has been cut along the second edge thereof between a pair of rotary rollers so as to remove the fluid in the ridges of the cut cap packing sheet while compressing the cut cap packing sheet;
• and
• winding the cut cap packing sheet on an outer surface of a winding roller.