| 摘要 |
A method of forming a valve bag suitable for filling with, for example, powder, grain, cement, animal foodstuffs, via a chute tube inserted into the valve, including forming a combined web from two webs of material, including steps of forming the combined web into a plurality of bag sections, sealing the bag sections at one side such that a valve portion is defined, separating the two webs and moving them outwardly until the bag sections are turned inside, and sealing the two webs to form a valve bag having an strong, effective seal and a valve portion for filling. |
