Source: https://patents.google.com/patent/US5220858A/en
Timestamp: 2018-06-18 00:40:45
Document Index: 546074538

Matched Legal Cases: ['art 3', 'art 3', 'art 3', 'art 3', 'art 3', 'art.\n1']

US5220858A - Method and apparatus for forming scored lines on sheet material - Google Patents
Method and apparatus for forming scored lines on sheet material Download PDF
US5220858A
US5220858A US07959478 US95947892A US5220858A US 5220858 A US5220858 A US 5220858A US 07959478 US07959478 US 07959478 US 95947892 A US95947892 A US 95947892A US 5220858 A US5220858 A US 5220858A
US07959478
Samuel Jones and Co Ltd
It is among the objects of the present invention to provide an alternative method and apparatus for forming scored lines on sheet material, especially label laminates, which takes account of variability in laminate thickness, and which has particular advantages for use in the formation of scored lines at an acute angle, typically 45° to the longitudinal axis of the sheet.
Preferably the arrangement is such that this scoring element is disposed on the roll having a resilient surface. Preferably the resilient surface has a Shore D hardness in the range of about 60° to about 85° measured according to International Standard ISO 868-1978 (British Standard BS2782:Part 3:Method 365B:1981 or Standard D2240 of the American Society for Testing Materials).
From another aspect the invention provides a rotatably mounted and substantially rigid scoring roll, for use in co-operation with a substantially rigid and rotatably mounted anvil roll having a hard surface, to form a nip through which scorable material, such as paper, can be passed for the formation of scored lines thereon, said scoring roll having one or more linear scoring elements extending over a resilient surface layer formed on said scoring roll, said surface layer having Shore D hardness in the range of about 60° to about 85° measured according to International Standard ISO 868-1978 (British Standard BS2782:Part 3:Method 365B:1981 or Standard D2240 of the American Society for Testing Materials).
In another aspect, the invention provides apparatus for forming scored lines of a required depth on a sheet of scorable material, comprising a rotatably mounted and substantially rigid scoring roll having one or more linear scoring elements extending across the surface thereof, a substantially rigid anvil roll having a hard surface and rotatably mounted in substantially parallel relation to said scoring roll to define a nip therewith, and means for generating pressure between said rolls at said nip to form scored lines of the required depth on said scorable material during passage thereof through said nip, with one of said rolls having a resilient surface layer formed thereon having a Shore D hardness in the range of about 60° to about 85° measured according to International Standard ISO 868-1987 (British Standard BS2782:Part 3:Method 365B:1981 or Standard D2240 of the American Society for Testing Materials).
In a further aspect, the invention provides apparatus for forming scored lines of a required depth on a sheet of scorable material, comprising a steel scoring roll having a plurality of tensioned wires between about 1.1 mm and 1.4 mm in diameter, extending helically, and in substantially parallel relationship across a resilient surface layer formed on said roll and having a Shore D hardness in the range of about 60° to about 85° measured according to International Standard ISO 868-1978 (British Standard BS2782:Part 3:Method 365B:1981 and Standard D2240 of the American Society for Testing Materials), a steel anvil roll, means for mounting said scoring and anvil rolls for rotation about substantially parallel horizontal axes, means for moving at least one of said rolls towards the other roll to form and generate pressure at a nip, so that contra-rotation of said rolls to draw a sheet of scorable material through said nip will generate on said material a series of parallel scored lines of the required depth extending at an acute angle to the direction of movement of said material.
Preferably the scoring and anvil rolls are made of steel and the resilient material with which one or other of the rolls is coated is preferably polyurethane. Preferably, the resilient material has a Shore D hardness of about 70° to about 80° measured as specified above and optimally the hardness is about 75°.
Use of a resilient surface layer having a hardness of less than about 60° results in uncontrollable variability in the scored lines, and generally to underscoring. If the hardness is greater than about 85°, the roll system is insufficiently sensitive to variations in laminate thickness and over or under scoring results.
Advantageously, the anvil roll is also formed with a central land which forms the nip with the scoring roll so that scoring is not effected across the full width of the scored web. This has been found to give more reliable operation, in that the full tensile strength of the web is present at the web edge, so reducing the chance of the web breaking. Furthermore, the axis of the anvil or scoring roll may be skewed very slightly, for example by 1° or 2° with respect to the axis of the other roll, the amount of skew depending on the length of the rolls. Such skewing can sometimes improve the pressure distribution across the nip, depending on the length, diameter and degree of flexibility, perpendicular to their axes, of the scoring and anvil rolls.
The surface of the cylindrical shell 6 carries a resilient sheath 11, 12 mm thick, of polyurethane resin. The cured resin has Shore D hardness of around 75° measured according to International Standard ISO 868-1978 (British Standard BS2782:Part 3:Method 365B:1981 or Standard D2240 of the American Society for Testing Materials).
A series of 18 gauge wires (1.2 mm in diameter) are passed through the axial holes in the flange 13 and the wire ends secured by tightening the grub screws. The wires are laid helically and in parallel relation across the surface of the polyurethane coating 11 and at an angle of 45° to the axis of the roll 5. At the other end of the roll 5, the wires are passed around the radially extending pins located in the flange 15 and then through the axially extending apertures in the flange 16, where, after tensioning, they are secured by tightening the grub screws. The wires could alternatively be tensioned with springs as shown in the prior art.
1. A method of forming a scored line on a sheet of scorable material comprising the steps of passing the sheet through the nip of a pair of contra-rotating rolls, one of which rolls has a hard surface and the other of which rolls has a resilient surface layer having a Shore D hardness in the range 60° to 85° and has at least one scoring element extending over said resilient surface layer, said scoring element being a tensioned wire, and applying a controlled amount of nip pressure to the rolls to exert a controlled pressure on said sheet.
16. Apparatus for forming a scored line on a sheet of scorable material comprising:
a pair of contra-rotating rolls having a nip between them for engaging the sheet of scorable material as it passes therethrough,
one said roll having a hard surface,
the other said roll having a resilient surface layer having a Shore D hardness in the range of 60° to 85°,
at least one scoring element extending over said resilient surface of said other roll, said scoring element being a tensioned wire, and
means for applying a controlled amount of nip pressure to said rolls to exert a controlled pressure on said sheet.
17. Apparatus according to claim 16, wherein the tensioned wire scoring element extends helically across the resilient surface layer.
US07959478 1989-06-13 1992-10-09 Method and apparatus for forming scored lines on sheet material Expired - Fee Related US5220858A (en)
GB8913564A GB8913564D0 (en) 1989-06-13 1989-06-13 Apparatus for forming scored lines on sheet material
GB8913564 1989-06-13
GB8922361 1989-10-04
GB8922361A GB8922361D0 (en) 1989-10-04 1989-10-04 Method and apparatus for forming scored lines on sheet material
US52282290 true 1990-05-14 1990-05-14
US07959478 US5220858A (en) 1989-06-13 1992-10-09 Method and apparatus for forming scored lines on sheet material
US52282290 Continuation 1990-05-14 1990-05-14
US5220858A true US5220858A (en) 1993-06-22
ID=27450352
US07959478 Expired - Fee Related US5220858A (en) 1989-06-13 1992-10-09 Method and apparatus for forming scored lines on sheet material
US (1) US5220858A (en)
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US4195556A (en) * 1977-01-05 1980-04-01 The Brown-Bridge Mills, Inc. Method for forming a strippable backing material for pressure-sensitive adhesive carrying substrates
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