Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A METHOD OF PROVIDING A WEB PACKAGING MATERIAL WITH A TEAR STRIP, COMPISING, IN COMBINATION, THE STEPS OF: FEEDING SAID WEB OF PACKAGING MATERIAL ALONG A FEED PATH, PERFORATING SAID WEB IN A ZONE EXTENDING SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL EDGES THEREOF, CUTTING A STRIP FROM A WEB OF TEAR-STRIP MATERIAL, APPLYING SAID STRIP TO ONE SURFACE OF SAID WEB OF PACKAGING MATERIAL TO OVERLIE SAID ZONE OF PERFORATION, APPLYING SUCTION TO THE RESPECTIVE OPPOSITE SURFACE OF SAID WEB OF PACKAGING MATERIAL TO TRANSMIT SAID SUCTION THROUGH SAID ZONE OF PERFORMATION AND THEREBY TO RETAIN SAID CUT STRIP AGAINST SAID ONE SURFACE, AND BONDING SAID CUT STRIP TO SAID WEB OF PACKAGING MATERIAL.
Claim 2
Independent Claim
113 words
A METHOD OF PROVIDING A WEB PACKAGING MATERIAL WITH A TEAR STRIP, COMPISING, IN COMBINATION, THE STEPS OF: FEEDING SAID WEB OF PACKAGING MATERIAL ALONG A FEED PATH, PERFORATING SAID WEB IN A ZONE EXTENDING SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL EDGES THEREOF, CUTTING A STRIP FROM A WEB OF TEAR-STRIP MATERIAL, APPLYING SAID STRIP TO ONE SURFACE OF SAID WEB OF PACKAGING MATERIAL TO OVERLIE SAID ZONE OF PERFORATION, APPLYING SUCTION TO THE RESPECTIVE OPPOSITE SURFACE OF SAID WEB OF PACKAGING MATERIAL TO TRANSMIT SAID SUCTION THROUGH SAID ZONE OF PERFORMATION AND THEREBY TO RETAIN SAID CUT STRIP AGAINST SAID ONE SURFACE, AND BONDING SAID CUT STRIP TO SAID WEB OF PACKAGING MATERIAL.
Claim 3
Dependent Claim
30 words
A method as defined in claim 1, wherein said bonding step comprises the application of heat to weld said cut strip of tear-strip material to said web of packaging material.
Claim 4
Dependent Claim
33 words
A method as defined in claim 1, wherein said bonding step comprises the application of an adhesive material to said cut strip to adhesively bond said strip to said web of packaging material.
Claim 5
Independent Claim
46 words
A DEVICE FOR PROVIDING A WEB OF PACKAGING MATERIAL WITH A TEAR-STRIP, COMPRISING, IN COMBINATION: FEEDER TO FEED SAID WEB OF PACKAGING MATERIAL ALONG A FEED PATH, PERFORATOR MEANS TO PERFORATE SAID WEB OF PACKAGING MATERIAL IN A ZONE SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS THEREOF,
Claim 6
Independent Claim
46 words
A DEVICE FOR PROVIDING A WEB OF PACKAGING MATERIAL WITH A TEAR-STRIP, COMPRISING, IN COMBINATION: FEEDER TO FEED SAID WEB OF PACKAGING MATERIAL ALONG A FEED PATH, PERFORATOR MEANS TO PERFORATE SAID WEB OF PACKAGING MATERIAL IN A ZONE SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS THEREOF,
Claim 7
Dependent Claim
28 words
A device as defined in claim 4, wherein said perforator means comprises a rotary cutter comprising two mutually co-operable cutter members at least one of which is rotatable.
Claim 8
Dependent Claim
77 words
A device as defined in claim 4, wherein said cutting means comprises a reciprocatable elongate member and a stationary member arranged to co-operate with said elongate member to cut a said strip of tear-strip material, said elongate member being provided with channels selectably connectable to a source of vacuum pressure to apply suction to said cut strip and being displaceable to place said cut strip in contact with said one surface of said web of packaging material.
Claim 9
Dependent Claim
87 words
A device as defined in claim 4, wherein said means for applying suction to said other surface of said web of packaging material comprises a suction chamber having a wall provided with a single elongate channel therein to establish communication between said suction chamber and said other surface of said web, said channel extending longitudinally of said web feed path and being so positioned with respect thereto that said zone of perforation in said web overlies said channel when said web is fed along said feed path.
Claim 10
Dependent Claim
30 words
A device as defined in claim 7, wherein said web feeder means comprises at least one endless belt permeable to air extending next adjacent said wall of said suction chamber.
Claim 11
Dependent Claim
37 words
A device as defined in claim 8, comprising a further belt of heat-resistant material co-operating with a length of said permeable belt to guide said web of packaging material and said cut strip between said two belts.
Claim 12
Dependent Claim
27 words
A device as defined in claim 4, wherein said perforator means is adapted to make a plurality of substantially U-shaped incisions through said web of packaging material.
Claim 13
Dependent Claim
30 words
A device as defined in claim 4, wherein said perforator means is adapted to make a plurality of mutually spaced and substantially I-shaped incisions through said web of packaging material.