Paper cartridge for extracting beverage and manufacturing method therefor

A manufacturing method of a paper cartridge for extracting a beverage, the paper cartridge comprising:

• a pod-shaped body having a first bottom part and a first side wall part constituting a receiving part, and a flange part formed by protruding along a circumference of an upper open part of the first side wall part;
• a porous inner filter having a second bottom part and a second side wall part constituting a storage part in which beverage powder is stored, an upper end of the second side wall part being bonded to an upper end of the first side wall part;
• a cover sheet bonded to the flange part of the body and sealing the body;
• and a medium bonding the inner filter and the cover sheet to the body, wherein the body, the porous inner filter, and the cover sheet are made of paper materials, and the medium comprises a synthetic resin component for thermal bonding, so the body, the inner filter, and the cover sheet made of the paper materials are bonded to each other via the medium by a hot-pressing method, the manufacturing method comprising:
• a) preparing each of the pod-shaped body, the porous inner filter, and the cover sheet which are made of the paper materials, and the medium and an adhesive sheet which comprise the synthetic resin component for thermal bonding;
• b) bonding contacting portions of the upper ends of the first side wall part of the body and the second side wall part of the inner filter to each other by applying heat and pressure thereto after fitting the inner filter into the receiving part of the body;
• c) storing the beverage powder in the storage part of the inner filter;
• and
• d) sealing the cartridge by bonding contacting portions of the flange part and the cover sheet to each other by applying heat and pressure thereto after covering the flange part of the body with the adhesive sheet and covering the adhesive sheet with the cover sheet.