초록 ▼

An air-evacuable bag has a one-way valve therein having two layers of valve film, neither of which is the sidewall of the bag. By forming the one-way valve of smooth, double-layered valve film, unwanted air gaps caused by textured surfaces in the sidewalls of the bag are avoided, thereby minimizing

An air-evacuable bag has a one-way valve therein having two layers of valve film, neither of which is the sidewall of the bag. By forming the one-way valve of smooth, double-layered valve film, unwanted air gaps caused by textured surfaces in the sidewalls of the bag are avoided, thereby minimizing air leakage back into an evacuated bag. A method for the manufacture of such air-evacuable bags incorporates a roll supplying a first valve film layer, a roll supplying a first sidewall layer, a roll supplying a second valve film layer, and a roll supplying a second sidewall layer. As the film coming off the first valve film layer roll passes the roll supplying the first sidewall layer, both the sidewall layer and first valve film layer move in close proximity to one another until the valve film is tacked to the first sidewall layer. The second film and second sidewall layer are processed simultaneously in a like manner, and all four layers are joined at a sealing station.

대표청구항 ▼

An air-evacuable bag has a one-way valve therein having two layers of valve film, neither of which is the sidewall of the bag. By forming the one-way valve of smooth, double-layered valve film, unwanted air gaps caused by textured surfaces in the sidewalls of the bag are avoided, thereby minimizing

An air-evacuable bag has a one-way valve therein having two layers of valve film, neither of which is the sidewall of the bag. By forming the one-way valve of smooth, double-layered valve film, unwanted air gaps caused by textured surfaces in the sidewalls of the bag are avoided, thereby minimizing air leakage back into an evacuated bag. A method for the manufacture of such air-evacuable bags incorporates a roll supplying a first valve film layer, a roll supplying a first sidewall layer, a roll supplying a second valve film layer, and a roll supplying a second sidewall layer. As the film coming off the first valve film layer roll passes the roll supplying the first sidewall layer, both the sidewall layer and first valve film layer move in close proximity to one another until the valve film is tacked to the first sidewall layer. The second film and second sidewall layer are processed simultaneously in a like manner, and all four layers are joined at a sealing station. ned by a first elongated seal sealing said first and second valve films to one another along an end of the evacuable bag;a second elongated seal sealing said first and second valve films to one another, the second elongated seal being substantially parallel to and spaced apart from the first elongated seal; a valve exit gap along the first elongated seal at one end of the elongated channel; and a valve entry gap along the second elongated seal at an end of the elongated channel opposite said end at which the valve exit gap is located. 8. The air-evacuable bag of claim 7, wherein said first sidewall is textured.9. The air-evacuable bag of claim 7, wherein said second sidewall is textured.10. The air-evacuable bag of claim 7, wherein said first and second valve films are substantially smooth relative to the respective first and second sidewalls.11. The air-evacuable bag of claim 8, wherein the texture of the first sidewall includes embossed pattern on an inside surface of the first sidewall facing the second sidewall.12. The air-evacuable bag of claim 9, wherein the texture of the second sidewall includes embossed pattern on an inside surface of the second sidewall facing the first sidewall.