CA1256014A - Method for the manufacture of a paper web with decorative edge cutting - Google Patents
Method for the manufacture of a paper web with decorative edge cuttingInfo
- Publication number
- CA1256014A CA1256014A CA000491054A CA491054A CA1256014A CA 1256014 A CA1256014 A CA 1256014A CA 000491054 A CA000491054 A CA 000491054A CA 491054 A CA491054 A CA 491054A CA 1256014 A CA1256014 A CA 1256014A
- Authority
- CA
- Canada
- Prior art keywords
- web
- rollers
- roller
- edge
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/002—Precutting and tensioning or breaking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/41—Winding, unwinding
- B65H2301/414—Winding
- B65H2301/4148—Winding slitting
- B65H2301/41487—Winding slitting trimming edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/13—Parts concerned of the handled material
- B65H2701/132—Side portions
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Laminated Bodies (AREA)
- Nonmetal Cutting Devices (AREA)
- Winding Of Webs (AREA)
- Paper (AREA)
Abstract
ABSTRACT
The invention relates to a method for the manufacture of letter paper with decorative edge cutting by tearing the edge portion of the letter paper along a previously prepared zone along which the letter paper is compressed or provided with a string shaped water mark.
The invention relates to a method for the manufacture of letter paper with decorative edge cutting by tearing the edge portion of the letter paper along a previously prepared zone along which the letter paper is compressed or provided with a string shaped water mark.
Description
The present Inventlon relates to a method for the manu-facture of a paper web wlth decoratlve edge cuttlng comprlslng the separatlon of at least one edge portlon of a paper web whlIst at the same tlme a decoratlve, Irregular edge structure Is 6 Imparted to the outer lateral edge of the web formed by the sepa-ratlon. The Inventlon relates further to a method for dlvldlng such a web cut along the edge Into sheets by severlng pleces of sheet from the web whlIst forming a decoratlve Irregular edge cuttlng transversely to the web.
In the manufacture of hand-made paper In the form of sheets a decoratlve, Irregular, outer edge Is obtalned. However, the manufacture of such paper Is very expenslve and such hand-made paper occurs, therefore, only to a very llmlted extent.
It has been found that paper of the same hlgh, and an even more unlform quallty then the exlstlng hand-made paper can be produced by mechanlcal means, but that the same decoratlve edge structure Is not obtalned by thls method owlng to the mechanIcal paper belng produced In an endless web and not In slngle sheets.
However, mechanlcally made paper of hlgh qualIty wlth decoratlve edge cuttlng can be produced If the cuttlng Is carrled out In a speclal manner and after speclal premachlnlng of the paper materlal. Accordlng to the present Inventlon the paper web Is compressed In the separatlng zone by means of cooperatlng rollers, whereupon the web Is conducted over a roller comprlslng a cuttlng or tearlng devlce, e.g. a tear wlre, knlfe or cuttlng wheel, whlch Is located so that It Is made to engage wlth the sald compressed reglon of the web when the same Is led over the roller and that the web, when It Is led past the cuttlng or tear-lng devlce, Is broken up In Its longltudlnal dlrectlon.
Accordlng to the present Inventlon therefore there Is provlded a method for the manufacture of a paper web or paper ~ ~ 1~
~I~
~2560~
sheets wlth decoratlve edge cuttlng comprlslng the separatlon of at least one edge portlon of a paper web whlIst at the same tlme a decoratlve, Irregular edge structure Is Imparted to the outer lateral edge of the web formed by the separatlon In whlch method 6 the paper web Is compressed In the separatlng zone by means of cooperatlng rollers, whereupon the web Is conducted over a roller comprlslng a cuttlng or tearlng devlce whlch Is located so that It Is made to engage wlth the sald compressed reglon of the web when the same Is led over the roller and that the web, when It Is led past the cuttlng or tearlng devlce, Is broken up In Its longltudlnal dlrectlon. Sultably the paper web Is provlded wlth longltudlnal and transverse dandy roller marks or watermar~s In narrow edge zones, the sald compression of the paper web as well as the sald separatlon of the paper web belng carrled out In these edge zones. Deslrably the sald compresslon of the separatlng zones Is carrled out by means of a tool wlth convex worklng surface. Preferably the sald tool has a v-shaped cross-sectlon wlth rounded front portlon. Sultably the compresslon of the sald longltudlnal edge zones Is carrled out wlth the help of
In the manufacture of hand-made paper In the form of sheets a decoratlve, Irregular, outer edge Is obtalned. However, the manufacture of such paper Is very expenslve and such hand-made paper occurs, therefore, only to a very llmlted extent.
It has been found that paper of the same hlgh, and an even more unlform quallty then the exlstlng hand-made paper can be produced by mechanlcal means, but that the same decoratlve edge structure Is not obtalned by thls method owlng to the mechanIcal paper belng produced In an endless web and not In slngle sheets.
However, mechanlcally made paper of hlgh qualIty wlth decoratlve edge cuttlng can be produced If the cuttlng Is carrled out In a speclal manner and after speclal premachlnlng of the paper materlal. Accordlng to the present Inventlon the paper web Is compressed In the separatlng zone by means of cooperatlng rollers, whereupon the web Is conducted over a roller comprlslng a cuttlng or tearlng devlce, e.g. a tear wlre, knlfe or cuttlng wheel, whlch Is located so that It Is made to engage wlth the sald compressed reglon of the web when the same Is led over the roller and that the web, when It Is led past the cuttlng or tear-lng devlce, Is broken up In Its longltudlnal dlrectlon.
Accordlng to the present Inventlon therefore there Is provlded a method for the manufacture of a paper web or paper ~ ~ 1~
~I~
~2560~
sheets wlth decoratlve edge cuttlng comprlslng the separatlon of at least one edge portlon of a paper web whlIst at the same tlme a decoratlve, Irregular edge structure Is Imparted to the outer lateral edge of the web formed by the separatlon In whlch method 6 the paper web Is compressed In the separatlng zone by means of cooperatlng rollers, whereupon the web Is conducted over a roller comprlslng a cuttlng or tearlng devlce whlch Is located so that It Is made to engage wlth the sald compressed reglon of the web when the same Is led over the roller and that the web, when It Is led past the cuttlng or tearlng devlce, Is broken up In Its longltudlnal dlrectlon. Sultably the paper web Is provlded wlth longltudlnal and transverse dandy roller marks or watermar~s In narrow edge zones, the sald compression of the paper web as well as the sald separatlon of the paper web belng carrled out In these edge zones. Deslrably the sald compresslon of the separatlng zones Is carrled out by means of a tool wlth convex worklng surface. Preferably the sald tool has a v-shaped cross-sectlon wlth rounded front portlon. Sultably the compresslon of the sald longltudlnal edge zones Is carrled out wlth the help of
2~ at least one rotatlng roller whlch Is provlded wlth annular rldge-lIke portlons arranged around the perlphery of the roller and that the hold-on roller Is constltuted of a plaln roller wlth hard surface. Preferably the compresslon of the sald transverse edges Is carrled out by means of a rotatlng roller wlth stralght rldge-lIke portlons arranged axlally on the surface of the roller and that the hold-on Is constltuted of a plaln roller wlth hard ! surface.
, In an embodIment of the process of the present Inven-tlon the web Is dlvlded Into sheets by the web, wlth cut edge and provlded wlth transverse compressed zones, belng conducted between two Indlvldually drlven palrs of rollers arranged at a ' dlstance from one another, the flrst palr of rollers belng drIven at a constant perIpheral speed whllst the second palr of rollers Is drIven at varylng perlpheral speeds In such a manner that the end of the web delIvered from the flrst palr of rollers Is made - 1a ~
- ~2560~4 to engage wlth the second palr of rollers whlch at the tIme Is at a lower perlpheral speed than the flrst palr of rollers, and so-called slack arlslng as a result on the part of the web sltuated between the palrs of roliers, whereupon the perlpheral speed of the second palr of rollers Is made to ~ncrease so that the part of the web between the sald palrs of rollers Is stretched and Is subJected to a tenslle stress of such a magnltude that the com-pressed transverse portlon whlch Is sltuated between the palrs of rollers Is forced to break, produclng an Indlvldually separated sheet whlch as It Is engaged by the second palr of rollers Is delIvered at a faster rate than the rate of feed of the web whlch Is fed forward by the flrst palr of rollers.
.
'' .
', 30 ' 35 ';
......
- 1b -12560~4 An embodiment of the method in accordance with the i vention ~ cc~rnPaQy'~
will be described in the following with reference to the cnelo~e~
schematic drawing, wherein Fig 1. shows an arrangement for the edge and sheet cutting of a paper web, Fig 2. shows a cross-section of the arrangement for compress-ion of the paper web, Fig 3. shows an arrangement for the cutting of the longitudi-nal edges, and Fig 4. shows the web schematically in its different phases during the cutting into sheets.
The manufacture of the web or sheet in accordance with the invention is started already during the paper making, where the paper stock in the normal manner is poured onto an endless wire screen. In a known manner so-called watermarks can be obtained in a paper by treating the paper pulp on the screen with a so-called dandy roller. This dandy roller consists of a cylinder clad with a screenlike wire netting. In this wire netting is inlaid a pattern of other wires which on the one hand project a little outside the surface of the wire cylinder and on the other hand reduce the mesh width on the net-clad cylinder. Along the region where additional wires have been inserted so-called watermarks are formed if the dandy roller is made to rotate with the screen and in so doing has its surface in the paper pulp.
It is possible in this manner to form longitudinal and transverse zones or edges which form watermarks in the finished paper. It is ensured of course that the width between the "watermark edges"
of the dandy roller becomes the desired width of the final web or sheet, and that the distance between the transverse watermark edges will correspond to the desired length of the sheets in the case where the web is intended to be divided up into individual sheets.
~2560~4 After drying of the paper web holes 42 may be made in the edge portions 41 of the web 2 for the guiding and feeding of the paper web e.g. into a data printer. As is evident from fig.4, the web 2 is provided with longitudinal watermark lines 43 and transverse watermark lines 44 which jointly delimit the sheet 45 which is to be produced, this sheet having a decorative, irregular edge zone 46 in the said water-mark zones 44 and 43. This combination of a watermark zone around the edge of the sheet 45 in conjunction with the irre gular edge cutting and the otherwise high quality of the paper give the impression of the paper having been hand-made.
Thus the paper web~is made in the normal manner but is provided with at least longitudinal watermark lines 43 and, if the web is to be converted to sheets, also with trans-verse watermark lines 44. The said paper web produced is rolledonto a magazine roll l which is shown in fig. l, and the web 2 is led over the deflection rollers 3 to be conducted subsequently to the treatment station I where the web in the longitudinal watermark zones 43 is subjected to a compression with the help of a tool which is arranged on a roller 4 and which operates against a plain hold-on roller 5. On the tool roller 4, which can be pressed against the hold-on roller 5 with the help of a spring or an air cylinder 8, a tool is arranged, the working surface of which has a profile 9 as shown in fig. 2. The com-pression tool 9 ;s thus of a convex shape and preferably a V-shape with rounded front surface and when the web 2 is conducted between the rollers 5 and 4 the tool 9 will be pressed 1nto the web 2, and since the tool 9 is arranged around the periehery of the web 4 the tool 9 will during the rolling movement continuous-ly compress a zone A of the web 2 whilst the web is conducted 12S6014.
past the roller pair ~ and 5. Owing to the particular shapeof the tool 9 the compression will be greatest at the front part of the tool 9 and diminish then towards the edges of the compression zone A. The compressed zone can be made of any width, but in the present case the wi-dth of the compressed zone is 1 - 5mm. As is evident from fig. 2, the compressed zone A is located within the zone B which represents the zones 43 with the longitudinal watermark edges. The tool 9 is thus brought into engagement with the web 2 along the longitudinal watermark zones 43 and is guided so that during the whole time the compress-ion zone is inside the watermark zone 43. Since the web 2 has two watermark zones 43, the roller 4 is provided with two annular tools arranged around the periphery of the roller which are adapted so that they both operate within the watermark edge zones 43, and the pressure with which the tool 9 is pressed against the web 2 can be regulated with the help of springs or air cylinders;8.
The tool 9 is preferably made of steel and the plain hold-on roller 5 too is preferably made of steel. The web treated in this manner in station I is conducted to station II which comprises a rotating roller 6, this roller being provided with grooves 20 which are arranged at such a distance from each other that their mutual position corresponds to the compressed water-mark zones 43. The station II, moreover, comprises a cutting arrangement 7 which consists of a stationary wire 21, preferably of metal, which is clamped between clamping points 22 fixed to the frame of machine.
~ Is is evident from fig.3, the wire 21 is clamped in such a manner that it is inclined in respect of the web and forms an acute angle alpha with the web. The wire 21 is located so that it lies in the groove 20 preferably without resting against the roller 6. The wires 21 are preferably adjusted so in their position that they correspond to the position of the compressed ~25Ei014 zone A on the watermark edges 43.
When the web 2 is led over the roller 6 the tearing wires 21 will tear up the material web 2 along the compressed parts of the watermark edge zones 43, the outer edges being separated whilst the tearing edge obtains a so~ewhat irregular edge struc-ture.
In the station III the separated edge zone 46 is machined again by two co-operating clamp rollers which are pressed against each other in the edge zone, any portions of the edge zone which may have "napped up" being pressed together. The web 2 - is led over the deflection roller 10 up to the station IV
where two co-operating and controlled clamp rollers compress the transverse watermark zones 44. This compression is carried out with linear pressing tools which are arranged a~ially to the surface of the clamp rollers 12, and the compression of the transverse watermark zones 44 is carried out in such a manner that the paper web is not completely severed but is substantially weakened in as much as the paper fibres are crushed. It is also possible to arrange on the rollers 12 hinged clippers for the severing of the paper sheets, but in this case it is not possible to achieve the same attractive edge structure as when the paper fibres are crushed and the sheets 45 are subsequently separated from the web 2 by pulling until the weakened watermark zone is caused to break. The cylinders 11 in the station IV have to be controlled so that the tools will engage at the right place, that is to say within the watermark edge 44 and this can be done e.g. by means of a photocellcontrol. This control functions so that a photocell indicates the position Gf the watermark zone 44 which is more transparent than the surrounding portions, whereupon a signal is transmitted to the driving unit for the pair of rollers so that the too1s 12, 13 will engage with the paper web 2 precisely in the transverse watermark zones 44.
12560~4 In case the web 2 is not completely severed but only weakened through compression of the watermark zone 44 the web is int w -duced between two driven rollers 14 which are driven by a motor 15 by means of a belt 16. In the tear-off station IV the web 2, after it has left the rollers 14, is ~ed further to the rollers 19 which with the help of a transmission 17 are driven by a gear which imparts an intermittent speed to the rollers.
In the station IV the individual sheets 45 are severed from the web 2 in that the front part of the web is torn or pulled loose from the rest of the web, the severing taking place along the weakened watermark zone 44. The tearing off takes place so that the web is advanced by and is held tight between the rollers 14 and that the front end of the web 2 is similarly advanced and held tight between the rollers 19. To the pair 15 of rollers 19 a rate of feed is imparted in a first phase which is less than the rate of feed of the pair of rollers 14. This means that the part of the web 2 which is between the pairs of rollers 14 and 19 is slightly slackened. In a second phase, though the rate of feed of the pair of rollers 19 is increased so that it becomes higher than the rate of feed of the pairof rollers 14 and when this happens the web is suddenly stretched, the tensile stresses in the web becoming so great that it breaks along the compressed and weakened portion which is located in the watermark zones 44. As the pair of rollers 19 continues at its higher rate of feed the sheet 45 which has been torn loose will be transported to the stack 30 of sheets before the front end of the web, which is fed forward with the hel p of pair of rollers 14, has time to advance to the nip between the pair of rollers 19.
The sheet 45 produced which has been treated in the above mentioned manner will have around its edge a narrow "watermark zone" and a somewhat irregular edge structure which is reminis-~2560~4 cent of that which is found on hand-made paper.
In certain cases it is not desired to sever the individual sheets from the web 2, but to retain the web. The edge zone 41 of the web may then be provided with holes 42 adapted for a feed by means of toothed wheels. The edge zonewith holes 42 can be used for toothed wheel feed in an arrangement of the type as shown in fig. I but it can also be used in conjunction with printouts from automatic printers of the type used in connec-tion with computers. If the guiding is done with the help of the toothed holes in the edge zones of the web 2, a very accurate feed of the web can be obtained and the edge zones 41 are severed in the manner as described earlier in the station I~
so that after passage of the clamp rollers 23 in the station III
they are removed as edge clippings and be dumped into a collect-;ng device 24.
The arrangement described here is intended only as anexample of such an arrangement representin~an embodiment of the invention and it is possible, for example, to use instead of the tearing wire 21 a rotating knife or a fixed (blunt) knife edge.
, In an embodIment of the process of the present Inven-tlon the web Is dlvlded Into sheets by the web, wlth cut edge and provlded wlth transverse compressed zones, belng conducted between two Indlvldually drlven palrs of rollers arranged at a ' dlstance from one another, the flrst palr of rollers belng drIven at a constant perIpheral speed whllst the second palr of rollers Is drIven at varylng perlpheral speeds In such a manner that the end of the web delIvered from the flrst palr of rollers Is made - 1a ~
- ~2560~4 to engage wlth the second palr of rollers whlch at the tIme Is at a lower perlpheral speed than the flrst palr of rollers, and so-called slack arlslng as a result on the part of the web sltuated between the palrs of roliers, whereupon the perlpheral speed of the second palr of rollers Is made to ~ncrease so that the part of the web between the sald palrs of rollers Is stretched and Is subJected to a tenslle stress of such a magnltude that the com-pressed transverse portlon whlch Is sltuated between the palrs of rollers Is forced to break, produclng an Indlvldually separated sheet whlch as It Is engaged by the second palr of rollers Is delIvered at a faster rate than the rate of feed of the web whlch Is fed forward by the flrst palr of rollers.
.
'' .
', 30 ' 35 ';
......
- 1b -12560~4 An embodiment of the method in accordance with the i vention ~ cc~rnPaQy'~
will be described in the following with reference to the cnelo~e~
schematic drawing, wherein Fig 1. shows an arrangement for the edge and sheet cutting of a paper web, Fig 2. shows a cross-section of the arrangement for compress-ion of the paper web, Fig 3. shows an arrangement for the cutting of the longitudi-nal edges, and Fig 4. shows the web schematically in its different phases during the cutting into sheets.
The manufacture of the web or sheet in accordance with the invention is started already during the paper making, where the paper stock in the normal manner is poured onto an endless wire screen. In a known manner so-called watermarks can be obtained in a paper by treating the paper pulp on the screen with a so-called dandy roller. This dandy roller consists of a cylinder clad with a screenlike wire netting. In this wire netting is inlaid a pattern of other wires which on the one hand project a little outside the surface of the wire cylinder and on the other hand reduce the mesh width on the net-clad cylinder. Along the region where additional wires have been inserted so-called watermarks are formed if the dandy roller is made to rotate with the screen and in so doing has its surface in the paper pulp.
It is possible in this manner to form longitudinal and transverse zones or edges which form watermarks in the finished paper. It is ensured of course that the width between the "watermark edges"
of the dandy roller becomes the desired width of the final web or sheet, and that the distance between the transverse watermark edges will correspond to the desired length of the sheets in the case where the web is intended to be divided up into individual sheets.
~2560~4 After drying of the paper web holes 42 may be made in the edge portions 41 of the web 2 for the guiding and feeding of the paper web e.g. into a data printer. As is evident from fig.4, the web 2 is provided with longitudinal watermark lines 43 and transverse watermark lines 44 which jointly delimit the sheet 45 which is to be produced, this sheet having a decorative, irregular edge zone 46 in the said water-mark zones 44 and 43. This combination of a watermark zone around the edge of the sheet 45 in conjunction with the irre gular edge cutting and the otherwise high quality of the paper give the impression of the paper having been hand-made.
Thus the paper web~is made in the normal manner but is provided with at least longitudinal watermark lines 43 and, if the web is to be converted to sheets, also with trans-verse watermark lines 44. The said paper web produced is rolledonto a magazine roll l which is shown in fig. l, and the web 2 is led over the deflection rollers 3 to be conducted subsequently to the treatment station I where the web in the longitudinal watermark zones 43 is subjected to a compression with the help of a tool which is arranged on a roller 4 and which operates against a plain hold-on roller 5. On the tool roller 4, which can be pressed against the hold-on roller 5 with the help of a spring or an air cylinder 8, a tool is arranged, the working surface of which has a profile 9 as shown in fig. 2. The com-pression tool 9 ;s thus of a convex shape and preferably a V-shape with rounded front surface and when the web 2 is conducted between the rollers 5 and 4 the tool 9 will be pressed 1nto the web 2, and since the tool 9 is arranged around the periehery of the web 4 the tool 9 will during the rolling movement continuous-ly compress a zone A of the web 2 whilst the web is conducted 12S6014.
past the roller pair ~ and 5. Owing to the particular shapeof the tool 9 the compression will be greatest at the front part of the tool 9 and diminish then towards the edges of the compression zone A. The compressed zone can be made of any width, but in the present case the wi-dth of the compressed zone is 1 - 5mm. As is evident from fig. 2, the compressed zone A is located within the zone B which represents the zones 43 with the longitudinal watermark edges. The tool 9 is thus brought into engagement with the web 2 along the longitudinal watermark zones 43 and is guided so that during the whole time the compress-ion zone is inside the watermark zone 43. Since the web 2 has two watermark zones 43, the roller 4 is provided with two annular tools arranged around the periphery of the roller which are adapted so that they both operate within the watermark edge zones 43, and the pressure with which the tool 9 is pressed against the web 2 can be regulated with the help of springs or air cylinders;8.
The tool 9 is preferably made of steel and the plain hold-on roller 5 too is preferably made of steel. The web treated in this manner in station I is conducted to station II which comprises a rotating roller 6, this roller being provided with grooves 20 which are arranged at such a distance from each other that their mutual position corresponds to the compressed water-mark zones 43. The station II, moreover, comprises a cutting arrangement 7 which consists of a stationary wire 21, preferably of metal, which is clamped between clamping points 22 fixed to the frame of machine.
~ Is is evident from fig.3, the wire 21 is clamped in such a manner that it is inclined in respect of the web and forms an acute angle alpha with the web. The wire 21 is located so that it lies in the groove 20 preferably without resting against the roller 6. The wires 21 are preferably adjusted so in their position that they correspond to the position of the compressed ~25Ei014 zone A on the watermark edges 43.
When the web 2 is led over the roller 6 the tearing wires 21 will tear up the material web 2 along the compressed parts of the watermark edge zones 43, the outer edges being separated whilst the tearing edge obtains a so~ewhat irregular edge struc-ture.
In the station III the separated edge zone 46 is machined again by two co-operating clamp rollers which are pressed against each other in the edge zone, any portions of the edge zone which may have "napped up" being pressed together. The web 2 - is led over the deflection roller 10 up to the station IV
where two co-operating and controlled clamp rollers compress the transverse watermark zones 44. This compression is carried out with linear pressing tools which are arranged a~ially to the surface of the clamp rollers 12, and the compression of the transverse watermark zones 44 is carried out in such a manner that the paper web is not completely severed but is substantially weakened in as much as the paper fibres are crushed. It is also possible to arrange on the rollers 12 hinged clippers for the severing of the paper sheets, but in this case it is not possible to achieve the same attractive edge structure as when the paper fibres are crushed and the sheets 45 are subsequently separated from the web 2 by pulling until the weakened watermark zone is caused to break. The cylinders 11 in the station IV have to be controlled so that the tools will engage at the right place, that is to say within the watermark edge 44 and this can be done e.g. by means of a photocellcontrol. This control functions so that a photocell indicates the position Gf the watermark zone 44 which is more transparent than the surrounding portions, whereupon a signal is transmitted to the driving unit for the pair of rollers so that the too1s 12, 13 will engage with the paper web 2 precisely in the transverse watermark zones 44.
12560~4 In case the web 2 is not completely severed but only weakened through compression of the watermark zone 44 the web is int w -duced between two driven rollers 14 which are driven by a motor 15 by means of a belt 16. In the tear-off station IV the web 2, after it has left the rollers 14, is ~ed further to the rollers 19 which with the help of a transmission 17 are driven by a gear which imparts an intermittent speed to the rollers.
In the station IV the individual sheets 45 are severed from the web 2 in that the front part of the web is torn or pulled loose from the rest of the web, the severing taking place along the weakened watermark zone 44. The tearing off takes place so that the web is advanced by and is held tight between the rollers 14 and that the front end of the web 2 is similarly advanced and held tight between the rollers 19. To the pair 15 of rollers 19 a rate of feed is imparted in a first phase which is less than the rate of feed of the pair of rollers 14. This means that the part of the web 2 which is between the pairs of rollers 14 and 19 is slightly slackened. In a second phase, though the rate of feed of the pair of rollers 19 is increased so that it becomes higher than the rate of feed of the pairof rollers 14 and when this happens the web is suddenly stretched, the tensile stresses in the web becoming so great that it breaks along the compressed and weakened portion which is located in the watermark zones 44. As the pair of rollers 19 continues at its higher rate of feed the sheet 45 which has been torn loose will be transported to the stack 30 of sheets before the front end of the web, which is fed forward with the hel p of pair of rollers 14, has time to advance to the nip between the pair of rollers 19.
The sheet 45 produced which has been treated in the above mentioned manner will have around its edge a narrow "watermark zone" and a somewhat irregular edge structure which is reminis-~2560~4 cent of that which is found on hand-made paper.
In certain cases it is not desired to sever the individual sheets from the web 2, but to retain the web. The edge zone 41 of the web may then be provided with holes 42 adapted for a feed by means of toothed wheels. The edge zonewith holes 42 can be used for toothed wheel feed in an arrangement of the type as shown in fig. I but it can also be used in conjunction with printouts from automatic printers of the type used in connec-tion with computers. If the guiding is done with the help of the toothed holes in the edge zones of the web 2, a very accurate feed of the web can be obtained and the edge zones 41 are severed in the manner as described earlier in the station I~
so that after passage of the clamp rollers 23 in the station III
they are removed as edge clippings and be dumped into a collect-;ng device 24.
The arrangement described here is intended only as anexample of such an arrangement representin~an embodiment of the invention and it is possible, for example, to use instead of the tearing wire 21 a rotating knife or a fixed (blunt) knife edge.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for the manufacture of a paper web or paper sheets with decorative edge cutting comprising the separa-tion of at least one edge portion of a paper web whilst at the same time a decorative, irregular edge structure is imparted to the outer lateral edge of the web formed by the separation in which method the paper web is compressed in the separating zone by means of cooperating rollers, whereupon the web is conducted over a roller comprising a cutting or tearing device which is located so that it is made to engage with the said compressed region of the web when the same is led over the roller and that the web, when it is led past the cutting or tearing device, is broken up in its longitudinal direction.
2. A method in accordance with claim 1, in which the paper web is provided with longitudinal and transverse dandy roller marks or watermarks in narrow edge zones, the said com-pression of the paper web as well as the said separation of the paper web being carried out in these edge zones.
3. A method in accordance with claim 1, in which the said compression of the separating zones is carried out by means of a tool with convex working surface.
4. A method in accordance with claim 3, in which the said tool has a v-shaped cross-section with rounded front por-tion.
5. A method in accordance with claim 1, in which the compression of the said longitudinal edge zones is carried out with the help of at least one rotating roller which is provided with annular ridge-like portions arranged around the periphery of the roller and that the hold-on roller is constituted of a plain roller with hard surface.
6. A method in accordance with claim 1, in which the compression of the said transverse edges is carried out by means of a rotating roller with straight ridge-like portions arranged axially on the surface of the roller and that the hold-on is con-stituted of a plain roller with hard surface.
7. A method in accordance with claim 1, in which the web is divided into sheets by the web with cut edge and provided with transverse compressed zones being conducted between two individually driven pairs of rollers arranged at a distance from one another, the first pair of rollers being driven at a constant peripheral speed whilst the second pair of rollers is driven at varying peripheral speeds in such a manner that the end of the web delivered form the first pair of rollers is made to engage with the second pair of rollers which at the time is at a lower peripheral speed than the first pair of rollers and so-called slack arising as a result on the part of the web situated between the pairs of rollers, whereupon the peripheral speed of the sec-ond pair of rollers is made to increase so that the part of the web between the said pairs of rollers is stretched and is sub-jected to a tensile stress of such a magnitude that the com-pressed transverse portion which is situated between the pairs of rollers is forced to break producing an individually separated sheet which as it is engaged by the second pair of rollers is delivered at a faster rate than the rate of feed of the web which is fed forward by the first Pair of rollers.
8. An apparatus for use in the method of claim 1, 2 or 3 including a cutting device comprising a stationary, thin wire which is arranged in a groove or a recess in a roller cooperating with a roller, the wire being arranged in such a manner that it is inclined in respect of the tangent of the roller surface in the point of cut between wire and roller surface and the wire Is arranged right-angled to the axle of the roller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8423674 | 1984-09-19 | ||
| GB08423674A GB2166996B (en) | 1984-09-19 | 1984-09-19 | A method for the manufacture of a paper web with decorative edge cutting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1256014A true CA1256014A (en) | 1989-06-20 |
Family
ID=10566940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000491054A Expired CA1256014A (en) | 1984-09-18 | 1985-09-18 | Method for the manufacture of a paper web with decorative edge cutting |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0175276B1 (en) |
| JP (1) | JPS6186195A (en) |
| AT (1) | ATE68395T1 (en) |
| CA (1) | CA1256014A (en) |
| DE (1) | DE3584411D1 (en) |
| GB (1) | GB2166996B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19930897C1 (en) * | 1999-07-05 | 2001-05-03 | Gevas Verpackungsmaschinen Gmbh | Material web with tearable strips divided by dividing lines and device for producing the dividing lines in the material web |
| CN110238883A (en) * | 2019-07-26 | 2019-09-17 | 益阳市锦汇电子有限公司 | A kind of capacitor production raw material cutting device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1616211A (en) * | 1927-02-01 | Method and apparatus for making paper having the appearance op | ||
| US1470675A (en) * | 1921-10-10 | 1923-10-16 | American Writing Paper Company | Method for making paper having the appearance of handmade paper |
| GB282620A (en) * | 1926-12-24 | 1928-03-29 | Christiaan Moes | Process and apparatus for the manufacture of paper which possesses properties closely resembling those of hand made paper |
| US1761051A (en) * | 1929-01-30 | 1930-06-03 | Wilfrid J Rivard | Deckling machine |
| US2026754A (en) * | 1933-02-08 | 1936-01-07 | Celanese Corp | Manipulation of sheet material |
| GB551379A (en) * | 1941-08-18 | 1943-02-19 | Standard Register Co | Apparatus for severing a continuous web of material into a succession of sheets |
| CH318840A (en) * | 1954-03-16 | 1957-01-31 | Goessler & Cie Ag H | Method and device for the production of paper goods with a deckle edge |
| US3630114A (en) * | 1970-04-15 | 1971-12-28 | Du Pont | Polymeric filament sheet slitting |
| US3666151A (en) * | 1970-08-18 | 1972-05-30 | Du Pont Canada | Apparatus for and method of severing film |
-
1984
- 1984-09-19 GB GB08423674A patent/GB2166996B/en not_active Expired
-
1985
- 1985-09-11 EP EP85111502A patent/EP0175276B1/en not_active Expired - Lifetime
- 1985-09-11 DE DE8585111502T patent/DE3584411D1/en not_active Expired - Lifetime
- 1985-09-11 AT AT85111502T patent/ATE68395T1/en active
- 1985-09-18 JP JP60206189A patent/JPS6186195A/en active Pending
- 1985-09-18 CA CA000491054A patent/CA1256014A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0175276A2 (en) | 1986-03-26 |
| GB8423674D0 (en) | 1984-10-24 |
| DE3584411D1 (en) | 1991-11-21 |
| JPS6186195A (en) | 1986-05-01 |
| EP0175276A3 (en) | 1988-03-30 |
| EP0175276B1 (en) | 1991-10-16 |
| GB2166996B (en) | 1988-01-20 |
| ATE68395T1 (en) | 1991-11-15 |
| GB2166996A (en) | 1986-05-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |