Pocket valve for valved bags made of plastics material sheeting and having crossed end closures |
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| 申请号 | US3680770D | 申请日 | 1970-04-03 | 公开(公告)号 | US3680770A | 公开(公告)日 | 1972-08-01 |
| 申请人 | WINDMOELLER & HOELSCHER; | 发明人 | MULLER REINER; ACHELPOHL FRITZ; | ||||
| 摘要 | The pocket valve for a bag consists of a tube of plastics material sheeting, which tube is open in a portion of its length at its inner end along the two side edges. The lower of the two resulting flaps is backfolded and adhered to the corner tuck of the valve corner of the bag. | ||||||
| 权利要求 | 1. A pocket type valve in combination with a bag having folded end closures comprising two opposing corner flaps and two opposing side flaps, said valve comprising a flattened tube of plastic material sheeting having two opposing side edges said tube being open in a portion of its length at one end thereof along said two side edges to form two superposed flaps, the lower one of said flaps being backfolded and adhered to one of said corner flaps of the bag such that the other end of said tube faces outwardly, and said side flaps being adapted to be folded over for closing said end closure so as to overlie said tube. 2. A pocket type valve according to claim 1, wherein the width of said tube exceeds the width of said end closure in its closed condition and said tube having protruding side edges adapted to be folded over together with said side flaps of said end closure. 3. A pocket valve according to claim 1, characterized in that the pocket valve consists of an extruded seamless tube of plastics material sheeting and each side edge of said tube is removed in a narrow area defining the flaps. 4. A pocket valve according to claim 1, characterized in that the pocket valve consists of a sheet of plastics material sheeting, which sheet is folded on itself and has superimposed edges, which are joined by a seam weld except for a length portion, and the fold is slit in a length portion which is in register with the first-mentioned length portion. 5. A pocket valve according to claim 1, characterized in that the backfolded flap has been subjected to a surface-activating pretreatment on its side which faces the corner tuck and is adhered thereto. |
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