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 a side of an upper surface thereof at a regular interval and attached to a lower side of the formed film in a state in which each of the auxiliary check valves is disposed in an opening of each of the ridges of the formed film, 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;
• allowing the cap packing sheet which has been cut along the second edge thereof to pass between a pair of rotary rollers so as to remove the fluid in the ridges of the cap packing sheet while compressing the cap packing sheet;
• and
• winding on an outer surface of a winding roller in a roll type the cap packing sheet in which a second end thereof is sealed or the cap packing sheet in which the second end thereof is not sealed.