Patent ID: 8500617

Claim:
A method for manufacturing an extraction bag sheet, the extraction bag sheet being a water-permeable filter sheet on which tags bonded to a string are disposed at predetermined intervals in a lengthwise direction of the water-permeable filter sheet, the method comprising: (1) a step of placing and holding the tags on a rotary supporting body at predetermined intervals; (2) a threading step of threading the string into a continuous pattern by moving a threading member oscillatingly on a circumferential surface of the rotary supporting body having threading pins protruding from the circumferential surface; (3) a bonding step of bonding the string to the tags; (4) a step of supplying the water-permeable filter sheet onto the tags and the string placed on the rotary supporting body; (5) a bonding step of bonding the string to the water-permeable filter sheet on the rotary supporting body; and (6) a bonding step of bonding the tags to the water-permeable filter sheet on the rotary supporting body, wherein, in the bonding steps of (3), (5), and (6), bonding heads that are moved oscillatingly about a center axis of the rotary supporting body and moved vertically relative to the circumferential surface of the rotary supporting body are used, and oscillation speeds, vertical movement speeds, and press-contact time periods of the bonding heads are controlled using an oscillation servo motor and a vertical movement servo motor.