Method for attaching a spout to a flexible film pouch
A flexible film pouch includes an aperture to access its contents, and a closure means such as a re-sealable spout is applied over the aperture to permit sealed storage of the contents after opening. The closure means is attached to the flexible film pouch by means of a patch that is bonded to the inside of the pouch adjacent to the aperture. The patch is selected to have a mating surface that bonds with the inner surface of the pouch, where such bonding is preferably conducted by ultrasonic welding or adhesive bonding. The patch itself may have a hole that permits access to the contents of the pouch, or the closure means may include a cutting surface that tears a portion of the patch to permit access.
1. A re-sealable thin film pouch comprising:
a laminate pouch having a front wall and a back wall defining an interior volume therebetween, said front wall having an inner surface of a first material and an outer surface of a second material, and an aperture providing access to said interior volume;
a patch having a bonding surface formed of said first material, said patch bonded to said front wall at said inner surface, said aperture being totally sealingly closed by said patch; and
a spout for re-sealably closing the aperture in said front wall where said spout is bonded only to said patch through said aperture and not said pouch; said spout having a flange with an annular base with an inner diameter smaller than said aperture in the laminate pouch, the annular base affixed to an outer surface of the patch;
a cutting member arranged in said spout comprising a piercing tooth for opening the patch; and
a cap arranged on said spout with a member to rotate said cutting member about a longitudinal axis of said cap.
2. The re-sealable thin film pouch of claim 1 wherein said patch is bonded to said front wall ultrasonically.
3. The re-sealable thin film pouch of claim 1 wherein said patch is circular and is bonded proximal of said aperture.
4. The re-sealable thin film pouch of claim 1 wherein said patch is an elongate strip and is bonded to said inner surface of said front wall distal of said aperture.
5. A re-sealable thin film pouch comprising:
a laminate pouch having a front wall and a back wall defining an interior volume therebetween, said front wall having an inner surface of a first material and an outer surface of a second material, and a first aperture providing access to said interior volume;
a patch having a bonding surface formed of said first material, said patch bonded to said front wall at said inner surface, said patch having a second aperture smaller in diameter than a diameter of the first aperture in said wall;
a spout for re-sealably closing the second aperture in said patch; and
an annular ring on said spout with a diameter smaller than the diameter of the first aperture but larger than the second aperture; and
a cap arranged on said spout with a cutting member rotatable about a longitudinal axis of said cap.