| 摘要 |
<p>This invention relates to a method of manufacturing a valve bag. First and second webs of valve material (1,5), such as heat sealable plastic film, are combined to create a combined web of valve material (10), and a sealing process is applied thereto to define valve portions (16). The combined web of valve material (10) includes a plurality of valve strip portions (20), each including a valve portion (16). Then first and second bag sections (30,40), which may be on a first and second side (31,41) respectively of a web of folded bag material, or on a first web (131) and second web (141) of bag material respectively, are dispensed with the combined web of valve material (10) positioned in between, and brought together to form a combined web (50) of valve bag material. A sealing process is applied to the combined web (50) of valve bag material, forming a valve bag section. The bag section is then separated from the remainder of the combined web of valve bag material to form an individual valve bag.</p> |
