TH77664B - Methods for forming, filling and sealing bags - Google Patents

Abstract

DC60 (02/03/53) This invention describes a method and system for forming, filling, and sealing a continuous product-continuous side-gusseted pouch. It consists of the following steps: (i) preparation of a continuous film sheet; (ii) pulling the sheet on the pouch former to form a film tube with overlapping vertical film edges; (iii) sealing the overlapping vertical film edges with a vertical sealer to form a vertical seal while the film tube is continuously pulled in the direction of the machine; (iv) forming of the triangular sections on both transverse sides of the tube; (v) passing a horizontal seal across the film tube with a horizontal sealing clamp at a predetermined position below the vertical sealer to form a horizontal seal on top of the filled pouch and a horizontal seal on the bottom of the pouch to be filled, with an optional pore in between; (vi) feeding the product into the film tube; (vii) sealing the open end of the film tube with the horizontal sealing clamp at a predetermined position; and (viii) optionally, The filling and sealing of the bag to form each individual bag from that point, at the intersection of the horizontal seal with the inner edge of the triangular segment, the unsealed pouch segments protruding on each side of the intersection are formed, where the width of the unsealed pouch segment is between 25 and 50% of the total width of the triangular segment. Revised Abstract 17/05/2016. This invention describes a method and system for forming, filling, and sealing side-qusseted, continuously product-continuous triangular-segmented bags, which comprises the following steps: (i) preparation of a continuous film sheet; (ii) pulling the sheet on the bag former to form a film tube with overlapping vertical film edges; (iii) sealing the overlapping vertical film edges with a vertical sealer to form a vertical seal while the film tube is continuously pulled in the direction of the machine; (iv) forming the triangular segments on both transverse sides of the tube; (v) passing the horizontal seal across the film tube with a horizontal sealer clamp. (vi) feeding the product into the film tube; (vii) sealing the open end of the film tube with the vertical seal holder at the pre-defined position; and (viii) optionally, cutting the filled and sealed bag to form each individual bag from there, where at the intersection of the vertical seal with the inner edge of the triangular section, the unsealed bag portions protruding on each side of the intersection are formed, where the width of the unsealed bag portion is between 25 and 50% of the total width of the triangular section.

Claims (9)

Updated 17/05/2016 1. Method of forming, filling, and sealing of continuous side-gusseted self-supporting pouches, comprising the following steps: (i) preparation of the continuous film sheet; (ii) pulling the sheet onto the pouch former to form a film tube with overlapping vertical film edges; (iii) sealing the overlapping vertical film edges with a vertical sealer to form a vertical seal while the film tube is continuously oriented in the direction of the machine; (iv) forming the triangular sections on both transverse sides of the tube; (v) passing a horizontal seal across the film tube with a horizontal sealing clamp at a predetermined position below the vertical sealer to form a horizontal seal on top of the filled pouch and, optionally, a perforated seal on the bottom of the pouch to be filled; (vi) feeding the product into the film tube; (vii) sealing the open end of the film tube with the horizontal sealing clamp at a predetermined position; and (viii) optionally, The filled and sealed bag is cut to form each individual bag from that point, where the seal intersects with the inner end of the triangular section. The unsealed bag section protruding on each side of the intersection is formed, where the width of the unsealed bag section is between 26.66% and 40% of the total width of the triangular section, and where the maximum central shift of this triangular section is 13.335% of its total width, and the width of the unsealed bag section is between 200% and 300% of this maximum shift. 2. The method claimed under claim 1, in which the unsealed portion of the bag is free from sharp corners or bends. 3. Any of the methods claimed under the preceding claims where the height of the unsealed portion of the bag is less than 35% of the horizontal seal height. 4. Any of the methods claimed under the foregoing claims, where the outline of the unsealed pouch section is in the shape of a semicircle, oval, or elliptical. 5. In one of the ways claimed under the preceding claims, where the unsealed portion of the bag is formed at at least three corners of the bag. 6. Any of the methods claimed under the foregoing claims, where the horizontal seal height at one end is between 167 and 240% of the typical height of such seal, where a notch/slit is provided on the ear portions of the two triangular sections at such ends, such notch/slit is positioned below the unsealed pouch portion at the opposite end of the horizontal seal. 7. The method as claimed in claim 8, where the notch/cut is positioned 5 to 10 mm below the unsealed portion of the pocket. 8. Any method under any of the aforementioned claims where the ear portions of the triangular sections are not sealed to each other. 9. Any of the methods claimed under the preceding claims, where such film is a two-layer lamination of 10 micron polyethylene terephthalate and 70 micron polyethylene. ----------------------------------------------------------------------------------------------------------------------------