Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
256 words
A method of forming a hinge valve comprising a valve tube and a leaf hinge and incorporating it in a folded end closure of a bag comprising the steps of feeding a first web of material for forming a plurality of leaf hinges and a second web of material for forming a plurality of valve tubes in superimposed relationship at equal speeds, simultaneously perforating said first and second webs of material along transverse lines at equal spacings to define equally long hinge and tube pieces in the respective webs between adjacent perforating lines therein, subsequently lifting said second web off the first web, positioning said second web in a loop so that it becomes offset in an upstream direction relative to the first web by a distance substantially equal to half the length of a tube piece, providing the concave face of the loop of said second web with adhesive beginning at each perforating lines therein and extending for a distance substantially equal to half the length of a tube piece, superimposing said webs again so that the leading half of each tube piece becomes adhesively connected to the trailing half of an underlying hinge piece, folding the leading half of said underlying hinge piece transversely over onto the trailing half thereof, successively tearing the resulting hinge valves off the webs and feeding each to a bag moving at the same speed as the valve so that the latter is adhered to a corner tuck of the bag by the folded-over half of the hinge piece.
Claim 2
Independent Claim
256 words
A method of forming a hinge valve comprising a valve tube and a leaf hinge and incorporating it in a folded end closure of a bag comprising the steps of feeding a first web of material for forming a plurality of leaf hinges and a second web of material for forming a plurality of valve tubes in superimposed relationship at equal speeds, simultaneously perforating said first and second webs of material along transverse lines at equal spacings to define equally long hinge and tube pieces in the respective webs between adjacent perforating lines therein, subsequently lifting said second web off the first web, positioning said second web in a loop so that it becomes offset in an upstream direction relative to the first web by a distance substantially equal to half the length of a tube piece, providing the concave face of the loop of said second web with adhesive beginning at each perforating lines therein and extending for a distance substantially equal to half the length of a tube piece, superimposing said webs again so that the leading half of each tube piece becomes adhesively connected to the trailing half of an underlying hinge piece, folding the leading half of said underlying hinge piece transversely over onto the trailing half thereof, successively tearing the resulting hinge valves off the webs and feeding each to a bag moving at the same speed as the valve so that the latter is adhered to a corner tuck of the bag by the folded-over half of the hinge piece.
Claim 3
Dependent Claim
350 words
Apparatus for forming a hinge valve comprising a valve tube and a leaf hinge and incorporating it in a folded end closure of a bag comprising: a. two pairs of feed rollers rotatable at equal speeds for simultaneously feeding in superimposed relationship a first web of material for forming a plurality of leaf hinges and a second web of material for forming a plurality of valve tubes, one pair of the feed rollers being spaced downstream of the other pair, b. rotary perforating means disposed upstream of said one pair of feed rollers and extending across said webs for perforating both webs along transverse lines at a spacing equal to the desired length of each valve tube, c. direction changing rollers for said second web disposed between said other pair of feed rollers and said perforating means for laying the second web in a loop of a length such that the second web becomes offset in an upstream direction relative to the first web by a distance substantially equal to half the desired length of each valve tube, d. an adhesive applicator is positioned within the loop for applying adhesive to said second web beginning at each perforating line therein and extending for a distance substantially equal to half the spacing between adjacent perforating lines, the said other pair of feed rollers being effective to bring the webs together and adhesively connect each valve tube length to an underlying length of leaf hinge, e. means for feeding bags in which hinge valves are to be incorporated at a predetermined speed, and f. a folding cylinder downstream of said other pair of feed rollers rotatable at a peripheral speed which is equal to said predetermined bag speed and greater than the peripheral speed of said web feed rollers, for tearing off successive adhesively interconnected valve tube and leaf hinge lengths, folding each leaf hinge length double and finally forming each hinge valve and feeding successive hinge valves to successive bags, means being provided for applying adhesive to each folded-over leaf hinge portion before the hinge valves are applied to the bags.
Claim 4
Dependent Claim
350 words
Apparatus for forming a hinge valve comprising a valve tube and a leaf hinge and incorporating it in a folded end closure of a bag comprising: a. two pairs of feed rollers rotatable at equal speeds for simultaneously feeding in superimposed relationship a first web of material for forming a plurality of leaf hinges and a second web of material for forming a plurality of valve tubes, one pair of the feed rollers being spaced downstream of the other pair, b. rotary perforating means disposed upstream of said one pair of feed rollers and extending across said webs for perforating both webs along transverse lines at a spacing equal to the desired length of each valve tube, c. direction changing rollers for said second web disposed between said other pair of feed rollers and said perforating means for laying the second web in a loop of a length such that the second web becomes offset in an upstream direction relative to the first web by a distance substantially equal to half the desired length of each valve tube, d. an adhesive applicator is positioned within the loop for applying adhesive to said second web beginning at each perforating line therein and extending for a distance substantially equal to half the spacing between adjacent perforating lines, the said other pair of feed rollers being effective to bring the webs together and adhesively connect each valve tube length to an underlying length of leaf hinge, e. means for feeding bags in which hinge valves are to be incorporated at a predetermined speed, and f. a folding cylinder downstream of said other pair of feed rollers rotatable at a peripheral speed which is equal to said predetermined bag speed and greater than the peripheral speed of said web feed rollers, for tearing off successive adhesively interconnected valve tube and leaf hinge lengths, folding each leaf hinge length double and finally forming each hinge valve and feeding successive hinge valves to successive bags, means being provided for applying adhesive to each folded-over leaf hinge portion before the hinge valves are applied to the bags.
Claim 5
Dependent Claim
62 words
Apparatus according to claim 2, wherein the adhesive applicator comprises a pipe extending within the loop transversely to the said second web, the pipe being provided with a plurality of ball valves facing the said second web, means for pressing the pipe onto the second web and withdrawing it again, and an adhesive container for supplying adhesive to the pipe under pressure.
Claim 6
Dependent Claim
39 words
Apparatus according to claim 3, wherein the pipe is carried at an end of a lever which is pivotable by a cam follower co-operating with a cam which is rotatable in synchronism with a drive for said feed rollers.