Patent EP0162704A2 successfully refreshed from Google Patents.
EP0162704A2
Expired / Lapsed
EP
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Manufacture of an expanded web of sheet material
Assignee: Philip Morris Products Inc
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Filing: 1985-05-21
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Granted: —
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Expires: 2005-05-21
Abstract
Abstract A sheet of material is passed through meshing rotary shearing and forming dies to form rows of convolutions 16 which in each row are separated by an undeformed neutral zone N between each pair of adjacent convolutions. The rows are staggered so that the peak of a convolution in one row coincides with the troughs in adjacent rows and vice versa but the neutral zones coincide to maintain the integrity of the expanded web. The expanded web 12 can then be laminated to a plane sheet 11. The resulting structure is useful as a cigarette wrapper which is wrapped around a tobacco rod through which the longitudinal air flow is as shown by the arrow. The dimensions and periodicity of the convolutions can be adjusted to control air flow through the wrapper.
Inventors
- 👤 Everett C. Grollimund
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 15:45
CPC Classifications
A; A24; A24D; A24D1/00; A24D1/02; B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2813
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
72 words
A method of making an expanded web comprising shearing and forming a web of formable sheet material to create rows of generally sinusoidal convolutions, the rows extending longitudinally along the web and each convolution in a row extending above and below the original plane of the web and being joined to the next longitudinally succeeding convolution by a flat portion of the web lying substantially in the original plane of the web.
Claim 2
Independent Claim
72 words
A method of making an expanded web comprising shearing and forming a web of formable sheet material to create rows of generally sinusoidal convolutions, the rows extending longitudinally along the web and each convolution in a row extending above and below the original plane of the web and being joined to the next longitudinally succeeding convolution by a flat portion of the web lying substantially in the original plane of the web.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1 in which the upper and lower extremities of the generally sinusoidal convolutions are generally flat and lie substantially parallel to the original plane of the web of formable sheet material.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 1 or 2 in which the web of formable sheet material comprises a sheet material about 3 mils thick.
Claim 5
Dependent Claim
22 words
A method as claimed in claim 1, 2 or 3 in which the web of formable sheet material comprises a cellulosic material.
Claim 6
Independent Claim
45 words
A method as claimed in any of the preceding claims in which the convolutions in each row are formed to be 180° out of phase with the convolutions in adjacent rows, the flat portions in each row being in alignment with those of adjacent rows.
Claim 7
Independent Claim
31 words
A method as claimed in any of the preceding claims wherein the formed web is laminated to the surface of a second web of sheet material to form a composite web.
Claim 8
Dependent Claim
45 words
A method as claimed in claim 6 in which the convolutions are formed by a continuous process, the lamination of the two webs is carried out continuously and the relative speeds of advance of the webs are adjustable to vary the periodicity of the convolutions.
Claim 9
Dependent Claim
17 words
A method aa claimed in claim 6 or 7 in which the second web is cigarette paper.
Claim 10
Dependent Claim
45 words
A method as claimed in claim 6, 7 or 8 in which the width of the second web is sufficiently greater than that of the first web to provide an overlap seam upon curling the composite web about its longitudinal axis to form a tube.
Claim 11
Dependent Claim
66 words
An expanded web of sheet material comprising a plurality of rows of generally sinusoidal convolutions formed from the sheet,-the rows lying side by side across the width of the web, each convolution in a row extending above and below the plane of the web and being connected to the longitudinally succeeding convolution by a portion of the web lying substantially in the plane of the web.
Claim 12
Dependent Claim
66 words
An expanded web of sheet material comprising a plurality of rows of generally sinusoidal convolutions formed from the sheet,-the rows lying side by side across the width of the web, each convolution in a row extending above and below the plane of the web and being connected to the longitudinally succeeding convolution by a portion of the web lying substantially in the plane of the web.
Claim 13
Dependent Claim
20 words
A composite web comprising a lamination of an expanded web as claimed in claim 10 with a second flat web.
Claim 14
Dependent Claim
28 words
The composite web of claim 11 in which the extremities of the convolutions are generally flat and lie substantially parallel to the original plane of the first web.
Claim 15
Dependent Claim
19 words
The composite web of claim 11 in which the first web comprises a sheet material about 3 mils thick.
Claim 16
Dependent Claim
15 words
The composite web of claim 13 in which the sheet material comprises a cellulosic material.
Claim 17
Dependent Claim
14 words
The composite web of claim 11 in which the second web comprises cigarette paper.
Claim 18
Dependent Claim
42 words
The composite web of claim 11 in which the width of the second web is sufficiently greater than the width of the first web to provide an overlap seam upon curling the composite web about its longitudinal axis to form a tube.
Claim 19
Dependent Claim
47 words
A composite web as claimed in any of claims 11 to 16 in which the convolutions in each row are formed to be 180° out of phase with the convolutions in adjacent rows, the flat portion in each row being in alignment with those of adjacent rows.
Claim 20
Dependent Claim
28 words
A smoking article comprising a rod of smoking material surrounded by a wrapper, the wrapper being a composite web as claimed in any of claims 11 to 17.
Claim 21
Dependent Claim
31 words
Apparatus for manufacturing an expanded web by the method claimed in any of claims 1 to 5 comprising a set of meshing rotary forming and shearing dies for creating the convolutions.
Claim 22
Dependent Claim
78 words
Apparatus as claimed in claim 19 in which the die set comprises a plurality of horizontally-disposed pairs of dies, the teeth on each die lying 180° out of phase from the teeth on each horizontally adjacent die and each tooth of a die being joined to the next recess on the die by a flat segment, the flat segments of the die sets defining a neutral zone in which substantially no shearing or forming of the web occurs.
Claim 23
Dependent Claim
81 words
Apparatus as claimed in claim 19 or 20 for manufacturing a composite web in accordance with the method claimed in any of claims 6 to 9 comprising first feed means for delivery of a web of formable sheet material to the die set, second feed means for supplying a second web of paper-like material for lamination to a surface of the first web after passage of the first web through the die set and drive means for rotating the die set.
Claim 24
Dependent Claim
29 words
Apparatus as claimed in claim 21 comprising first accumulator means for metering the first web onto the second web after passage of the first web through the rotary dies.
Claim 25
Dependent Claim
43 words
Apparatus as claimed in claim 21 or 22 in which the drive means for the die set is operable to drive the rotary dies at different speeds relative to the speed of the second feed means, thereby varying the shape of the convolutions.
References Cited (Backward Citations)
No citation records indexed.
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