| 摘要 |
<p>Two continuous travelling webs (1, 2) of porous material are provided for forming the eventual infusion packages. The lower web (2) is dosed with measured amounts (3) of infusible substance, such as tea, on its upper surface at spaced intervals by the dosing roller (4). Two continuous travelling strips (5, 6) of tag material such as card, are also provided to form the tags in the finished infusion packages. The strips are guided to travel parallel to and at the same speed as the webs (1, 2), respectively. A rotating string drum (8) forms a continuous length of string (7) into a succession of predetermined patterns. The upper web (1) and strip (5) of tag material are guided to be side by side, and then pass in face-to-face contact with heated roller (9) which melts the thermoplastics coating on the web and strip to render them adhesive. The heated web and strip of tag material then travel for a short distance around the circumference of the string drum so that the string can adhere lightly to both the web (1) and strip (5). The web (2) carrying the dose of infusible substance, and the other strip (6) of tag material are guided to travel side by side and brought together with the web (1) and strip (5) at sealing rollers (11, 12) to form a succession of two-ply infusion containing pockets, and to correspondingly seal the strips (5, 6) of tag material. The sealed infusion-containing pockets and strips of tag material then travel together to the cutting rollers (14, 15) which cut both the strips of tag material and the webs to form infusion packages (17) and tags (18) of the desired shape.</p> |
