CPC B65D 33/00 (2013.01) [A41H 43/04 (2013.01); B29C 65/02 (2013.01); B29C 65/38 (2013.01); B29C 65/62 (2013.01); B29C 65/8215 (2013.01); B29C 66/1122 (2013.01); B29C 66/43 (2013.01); B29C 66/71 (2013.01); B29C 66/723 (2013.01); B29C 66/7292 (2013.01); B29C 66/73115 (2013.01); B29C 66/8322 (2013.01); B29C 66/91411 (2013.01); B29C 66/91935 (2013.01); B32B 5/024 (2013.01); B32B 5/26 (2013.01); D03D 1/02 (2013.01); D06H 5/00 (2013.01); B29C 65/16 (2013.01); B29C 65/8223 (2013.01); B29C 66/73711 (2013.01); B29C 66/73921 (2013.01); B29L 2031/712 (2013.01); B29L 2031/7128 (2013.01); B31B 50/00 (2017.08); B31B 70/62 (2017.08); B31B 70/642 (2017.08); B31B 70/68 (2017.08); B31B 70/79 (2017.08); B31B 2150/00 (2017.08); B31B 2150/003 (2017.08); B31B 2160/20 (2017.08); B31B 2160/30 (2017.08); B32B 2250/20 (2013.01); B32B 2255/02 (2013.01); B32B 2255/26 (2013.01); B32B 2262/0253 (2013.01); B32B 2307/21 (2013.01); B32B 2307/31 (2013.01); B32B 2307/714 (2013.01); B32B 2309/02 (2013.01); B32B 2309/12 (2013.01); B32B 2323/10 (2013.01); B65D 29/02 (2013.01); Y10T 156/10 (2015.01)] | 20 Claims |
1. A method of forming a flexible plastic fabric bulk bag with heat sealed joints, comprising the steps of:
a) providing a first folded bag portion having a first pair of outer left edges and a first pair of outer right edges, wherein a first left side panel of the first folded bag portion is drawn inward in between the first pair of outer left edges and wherein a first right side panel of the first folded bag portion is drawn inward in between the first pair of outer right edges;
b) providing a second folded bag portion having a second pair of outer left edges and a second pair of outer right edges, wherein a second left side panel of the second folded bag portion is drawn inward in between the second pair of outer left edges and a second right side panel of the second folded bag portion is drawn inward in between the second pair of outer right edges;
c) overlapping the first and second folded bag portions to define an overlapped area, wherein in the overlapped area interior surfaces of the first folded bag portion are in contact with exterior surfaces of the second folded bag portion, and wherein exterior surfaces of the first folded bag portion are in contact with one another, and interior surfaces of the second folded bag portion are in contact with one another;
d) applying heat and pressure to the overlapped area to form a heat sealed bag joint between the interior surfaces of the first folded bag portion and exterior surfaces of the second folded bag portion that are in contact; and
wherein the bag joint is not formed between at least some exterior surfaces of the first folded bag portion that are in contact with other exterior surfaces of the first folded bag portion and under the heat and pressure and the bag joint is not formed between at least some interior surfaces of the second folded bag portion that are in contact with other interior surfaces of the second folded bag portion and under the heat and pressure so that the bulk bag can expand to an open configuration when filled with bulk material.
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