CA1066102A - Means and method for easy conduction of the web end in a paper machine - Google Patents
Means and method for easy conduction of the web end in a paper machineInfo
- Publication number
- CA1066102A CA1066102A CA275,115A CA275115A CA1066102A CA 1066102 A CA1066102 A CA 1066102A CA 275115 A CA275115 A CA 275115A CA 1066102 A CA1066102 A CA 1066102A
- Authority
- CA
- Canada
- Prior art keywords
- pull
- strip
- section
- paper machine
- machine according
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/04—Paper-break control devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
Landscapes
- Paper (AREA)
- Advancing Webs (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
In a paper machine, a first section terminating in a discharge end from which a pull-in strip of a web initially hangs while travelling downwardly toward a part of the machine, a second section spaced from the first section and having a receiving end for receiving the pull-in strip of the web while the latter is initially conducted from the first section to the second section, the provision at a transfer region of chopper means which chop off useless portions of the pull-in strip and leave the pull-in strip intact only for a useful length appro-priate for the action of the pull-in aids thereon. And, a method of operating such a machine.
In a paper machine, a first section terminating in a discharge end from which a pull-in strip of a web initially hangs while travelling downwardly toward a part of the machine, a second section spaced from the first section and having a receiving end for receiving the pull-in strip of the web while the latter is initially conducted from the first section to the second section, the provision at a transfer region of chopper means which chop off useless portions of the pull-in strip and leave the pull-in strip intact only for a useful length appro-priate for the action of the pull-in aids thereon. And, a method of operating such a machine.
Description
1066~2 The present invention relates to a paper machine and more particularly to a paper-making machine of the kind (herein called "the kind defined") comprising pull-in aids which act upon a leading end portion of a pull-in strip for the pur-pose of causing the pull-in strip to follow a predetermined path at a transfer region from one section of the machine to another thereof, the pull-in strip serving in turn to draw a leading end portion of a full width web which is to follow the said path.
The pull-in aids may J for example, employ com-pressed air jets or endless belts or other elements guiding thepull-in strip from one section of the paper-making machine to !
another, such as for instance from a last drying cylinder to the first nip of a calender, or into a throat between a reel drum (also called a Pope cylinder) and a reel spool (also called a tambour iron).
In a known paper-making machine of the kind defi-ned there are usually transfer points where introductionof the web (pull-in) is accomplished by slicing from the side of the full-width web a pull-in strip (for example about 150 to 300 mm wide) which strip is conducted onward with the aid of compressed air jets or moving elements. Such transfer points in the machi-ne are, for instance, where the web transfers from the last drying cylinder to the machine calender, or from the calender to a paper reeling device.
Conventionally at these transfer points the said pull-in strip is allowed first to flow down into the so-called pulper or waste paper treating device under the machine; and when thereafter attempts are made to direct and guide this strip with the aid of moving elements or compressed air jets forwardly e.g. into the first throat of the calender or into that between the reel drum and the reel spool, then along with the usef~1 part of the strip there rise useless strip parts which wer~
R ~
.
already on the way to the pulper, and which useless parts owing to their weight considerably retard the web end pull-in.
It is also a drawback in this connection that the paper at the leading portion of the pull-in strip arrives at the next nip doubled, and there the fold is "rolled" over, whereby the pro-gress is slowed down and the progress of the pull-in strip is further substantially impeded.
There have been attempts to avoid the disadvantages mentioned above, for example various mechanical conveyors have been built to transfer the pull-in strip at transfer points like that from a drying cylinder to the calender. These expedients are quite expensive, compared with air guidance, and usually it is still impossible to prevent the paper from entering the next nip double-folded.
The present invention is therefore intended to facilitate the construction of an improved machine of the kind defined.
According to the present invention, ina papermachine having a first section terminating in a discharge end from which a pull-in strip of a web initially hangs while travelling down-wardly toward a part of the machine, a second section spaced from the first section and having a receiving end for receiving the pull-in strip of the web while the latter is initially con-ducted from the first section to the second section, there is provided at a transfer region of chopper means which chop off useless portions of the pull-in strip and leave the pull-in strip intact only for a useful length appropriated for the action of the pull-in aids thereon.
According to the present invention, there is alsopro-vided in a method of operating a paper machine, the steps of pro-viding at the end of one section of the paper machine a pull-in -strip to be used in conducting a web from the one section to the next section of the machine, with the pull-in strip initially hanging down from the end of the one section while travelling downwardly toward a part of the machine, then transferring the pull-in strip from the one section to the next section with the pull-in strip being in the form of a single layer which is not double folded, and, prior to the transferring step, continuously chopping the pull-in strip into relatively small portions which continue to travel down to the part of the machine while leaving above the location where the chopping of the pull-in strip occurs a pull-in strip portion having a length sufficiently great for transfer to the next section.
It is thus understood that for the invention the starting point has been chosen that the strip that is separated from the side of the paper web to the purpose of pull-in end conduction is chopped into bits before it enters the pulper, and before the pulper only such a length of intact strip is left as the efficient utilization of the air jet guiding requi-res. Hereby in the pull-in operation one will have to move with the aid of an air jet merely a short, and light, paper strip, i and which is easy to control, in addition to which this strip can be carried to the next nip as a single layer (not double folded), and hereby the strip can be guided with ease into the nip defined by rolls.
The invention is described in detail in the followin~, with reference to an embodiment given only as non limitative example and shown in the attached drawings, wherein:
Fig. 1 shows the concerned part of a paper machine according to the invention, in a partial view from the front, (Fig. 1 is also the section along line I-I in Fig. 2).
Fig. 2 shows the same part of the machine as Fig. 1, in elevational view.
~066102 The frame structures of the paper machine which are visible in the figures are generally denoted with the refe-rence numeral 10. The course followed by the paper web is indi-cated by W. Fig. 2 shows the last two drying cylinders 11 and 12 of a first section of the multiple cylinder dryer of the paper machine. Adjacent to the lower periphery of the last drying cylinder in the upper row of the multiple cylinder dryer 11, a doctor device 22 is mounted and in connection of which furthermore a compressed air jet means 23 is provided, the gui-ding jet produced by this means being schematically indicatedby arrows B. The purpose of the compressed air jet means 23 is to guide the web end pull- in strip that is separated from the side of the paper web, into the first nip 21 of the calender 30 forming part of a second section of the paper machine. The baffles 15 and 16 aid to the accomplishing of this task. As soon as one has succeeded in making the said pull-in strip run in the manner shown by Fig. 2, over the rolls 13 and 14 to the first nip 21 of the calender 30 and zigzagging aroung the calen-der roll 20, the web is expanded to full width in a manner pre-viously known in itself, using an oblique draw means.
Prior to operating the compressed air jet means23, the pull-in strip or the tail portion, and the web portion adjacent to but separated by a longitudinal slit from the strip, are conducted into the pulper in the direction indicated by the arrow A in Figure 2 leading into the pulper (not shown). Since the distance to the water level in the pulper, from the compres-sed air jet means 23, is about 4 or S m, the weight of the down-hanging pull-in strip will be quite significant, and therefore as the air jets begin to blow thereon in the directions of the arrows B it will tend to fold upon itself and at least be dou-bled, and the air jet in the directions of the arrows B will draw the pull-in strip upwardly in a bight, and forwardly; this '~
~066~02 results in the detrimental effects mentioned above. Sometimes the useless paper and pull-in strip separated therefrom amasses in the paper-making machine so rapidly as to exceed the rate at which this paper can be moved forwardly with the air jets in a desirable controlled manner.
For this reason the machine of the invention has, at the transfer region from dryer section to calender section, a pull-in strip chopping means (or chopper mQans) provided below the compressed air jet means 23~ As shown in the drawings, this chopping means comprises cantilever beams 17 and 28 extending horizontally from a vertical pillar 10 of the paper-making machine. To the upper beam 28 is pivotally attached a planar guiding member 19 which is turnable about a horizontal axis, with the aid of a power cylinder 18, into various positions in order to achieve an expedient guiding action. The guiding mem-ber has a planar top surface, and below this top surface are mounted electric or pneumatic or hydraulic motors 26 which ro-tate a set of circular blades 27, which project above and near a lower edge of the said top surface and serve the purpose of chopping pull-in strip as it approaches the said lower edge of the top surface of the guiding member 19. The paper choppings produced in this manner fall down into the pulper, passing in front of a baffle plate 24, and can no longer interfere with the further conduction of the pull-in strip.
The chopping means may be constructed in any suitable manner, and may differ considerably from the illustrated means. The chopping means may have fast-moving either rotating or oscillating blades and/or operate with water or air jets or wires or cords, provided that it manages in the time available to chop off the useless excess pull-in strip, leaving the strip intact only as long as is necessary for the further conduction of the pull-in strip, employing compressed air jet means or belts B
~0661~2 or other transfer aids at the transfer point.
The invention is not confined to the illustrated construct as described by way of example, and details may vary within the scope of the invention as defined in the following claims.
The pull-in aids may J for example, employ com-pressed air jets or endless belts or other elements guiding thepull-in strip from one section of the paper-making machine to !
another, such as for instance from a last drying cylinder to the first nip of a calender, or into a throat between a reel drum (also called a Pope cylinder) and a reel spool (also called a tambour iron).
In a known paper-making machine of the kind defi-ned there are usually transfer points where introductionof the web (pull-in) is accomplished by slicing from the side of the full-width web a pull-in strip (for example about 150 to 300 mm wide) which strip is conducted onward with the aid of compressed air jets or moving elements. Such transfer points in the machi-ne are, for instance, where the web transfers from the last drying cylinder to the machine calender, or from the calender to a paper reeling device.
Conventionally at these transfer points the said pull-in strip is allowed first to flow down into the so-called pulper or waste paper treating device under the machine; and when thereafter attempts are made to direct and guide this strip with the aid of moving elements or compressed air jets forwardly e.g. into the first throat of the calender or into that between the reel drum and the reel spool, then along with the usef~1 part of the strip there rise useless strip parts which wer~
R ~
.
already on the way to the pulper, and which useless parts owing to their weight considerably retard the web end pull-in.
It is also a drawback in this connection that the paper at the leading portion of the pull-in strip arrives at the next nip doubled, and there the fold is "rolled" over, whereby the pro-gress is slowed down and the progress of the pull-in strip is further substantially impeded.
There have been attempts to avoid the disadvantages mentioned above, for example various mechanical conveyors have been built to transfer the pull-in strip at transfer points like that from a drying cylinder to the calender. These expedients are quite expensive, compared with air guidance, and usually it is still impossible to prevent the paper from entering the next nip double-folded.
The present invention is therefore intended to facilitate the construction of an improved machine of the kind defined.
According to the present invention, ina papermachine having a first section terminating in a discharge end from which a pull-in strip of a web initially hangs while travelling down-wardly toward a part of the machine, a second section spaced from the first section and having a receiving end for receiving the pull-in strip of the web while the latter is initially con-ducted from the first section to the second section, there is provided at a transfer region of chopper means which chop off useless portions of the pull-in strip and leave the pull-in strip intact only for a useful length appropriated for the action of the pull-in aids thereon.
According to the present invention, there is alsopro-vided in a method of operating a paper machine, the steps of pro-viding at the end of one section of the paper machine a pull-in -strip to be used in conducting a web from the one section to the next section of the machine, with the pull-in strip initially hanging down from the end of the one section while travelling downwardly toward a part of the machine, then transferring the pull-in strip from the one section to the next section with the pull-in strip being in the form of a single layer which is not double folded, and, prior to the transferring step, continuously chopping the pull-in strip into relatively small portions which continue to travel down to the part of the machine while leaving above the location where the chopping of the pull-in strip occurs a pull-in strip portion having a length sufficiently great for transfer to the next section.
It is thus understood that for the invention the starting point has been chosen that the strip that is separated from the side of the paper web to the purpose of pull-in end conduction is chopped into bits before it enters the pulper, and before the pulper only such a length of intact strip is left as the efficient utilization of the air jet guiding requi-res. Hereby in the pull-in operation one will have to move with the aid of an air jet merely a short, and light, paper strip, i and which is easy to control, in addition to which this strip can be carried to the next nip as a single layer (not double folded), and hereby the strip can be guided with ease into the nip defined by rolls.
The invention is described in detail in the followin~, with reference to an embodiment given only as non limitative example and shown in the attached drawings, wherein:
Fig. 1 shows the concerned part of a paper machine according to the invention, in a partial view from the front, (Fig. 1 is also the section along line I-I in Fig. 2).
Fig. 2 shows the same part of the machine as Fig. 1, in elevational view.
~066102 The frame structures of the paper machine which are visible in the figures are generally denoted with the refe-rence numeral 10. The course followed by the paper web is indi-cated by W. Fig. 2 shows the last two drying cylinders 11 and 12 of a first section of the multiple cylinder dryer of the paper machine. Adjacent to the lower periphery of the last drying cylinder in the upper row of the multiple cylinder dryer 11, a doctor device 22 is mounted and in connection of which furthermore a compressed air jet means 23 is provided, the gui-ding jet produced by this means being schematically indicatedby arrows B. The purpose of the compressed air jet means 23 is to guide the web end pull- in strip that is separated from the side of the paper web, into the first nip 21 of the calender 30 forming part of a second section of the paper machine. The baffles 15 and 16 aid to the accomplishing of this task. As soon as one has succeeded in making the said pull-in strip run in the manner shown by Fig. 2, over the rolls 13 and 14 to the first nip 21 of the calender 30 and zigzagging aroung the calen-der roll 20, the web is expanded to full width in a manner pre-viously known in itself, using an oblique draw means.
Prior to operating the compressed air jet means23, the pull-in strip or the tail portion, and the web portion adjacent to but separated by a longitudinal slit from the strip, are conducted into the pulper in the direction indicated by the arrow A in Figure 2 leading into the pulper (not shown). Since the distance to the water level in the pulper, from the compres-sed air jet means 23, is about 4 or S m, the weight of the down-hanging pull-in strip will be quite significant, and therefore as the air jets begin to blow thereon in the directions of the arrows B it will tend to fold upon itself and at least be dou-bled, and the air jet in the directions of the arrows B will draw the pull-in strip upwardly in a bight, and forwardly; this '~
~066~02 results in the detrimental effects mentioned above. Sometimes the useless paper and pull-in strip separated therefrom amasses in the paper-making machine so rapidly as to exceed the rate at which this paper can be moved forwardly with the air jets in a desirable controlled manner.
For this reason the machine of the invention has, at the transfer region from dryer section to calender section, a pull-in strip chopping means (or chopper mQans) provided below the compressed air jet means 23~ As shown in the drawings, this chopping means comprises cantilever beams 17 and 28 extending horizontally from a vertical pillar 10 of the paper-making machine. To the upper beam 28 is pivotally attached a planar guiding member 19 which is turnable about a horizontal axis, with the aid of a power cylinder 18, into various positions in order to achieve an expedient guiding action. The guiding mem-ber has a planar top surface, and below this top surface are mounted electric or pneumatic or hydraulic motors 26 which ro-tate a set of circular blades 27, which project above and near a lower edge of the said top surface and serve the purpose of chopping pull-in strip as it approaches the said lower edge of the top surface of the guiding member 19. The paper choppings produced in this manner fall down into the pulper, passing in front of a baffle plate 24, and can no longer interfere with the further conduction of the pull-in strip.
The chopping means may be constructed in any suitable manner, and may differ considerably from the illustrated means. The chopping means may have fast-moving either rotating or oscillating blades and/or operate with water or air jets or wires or cords, provided that it manages in the time available to chop off the useless excess pull-in strip, leaving the strip intact only as long as is necessary for the further conduction of the pull-in strip, employing compressed air jet means or belts B
~0661~2 or other transfer aids at the transfer point.
The invention is not confined to the illustrated construct as described by way of example, and details may vary within the scope of the invention as defined in the following claims.
Claims (14)
1. In a paper machine, a first section termina-ting in a discharge end from which a pull-in strip of a web initially hangs while travelling downwardly toward a part of the machine, a second section spaced from said first section and having a receiving end for receiving the pull-in strip of the web while the latter is initially conducted from said first section to said second section,the provision at a transfer re-gion of chopper means means which chop off useless portions of the pull-in strip and leave the pull-in strip intact only for a useful length appropriated for the action of pull-in aids thereon.
2. In a paper machine, a first section termina-ting in a discharge end from which a pull-in strip of a web initially hangs while travelling downwardly toward a part of the machine, a second section spaced from said first section and having a receiving end for receiving the pull-in strip of the web while the latter is initially conducted from said first section to said second section, transfer means situated at the region of said discharge end of said first section for trans-ferring the pull-in strip from said discharge end of said first section to said receiving end of said second section while main-taining said pull-in strip in the form of a single layer which is not double folded, and chopper means situated along a path of travel of the downwardly hanging pull-in strip of the web issuing at the discharge end of said first section for chopping said pull-in strip into relatively small web portions which con-tinue to travel downwardly beyond said chopper means, with said chopper means being situated along said path at a location which leaves above said chopper means a pull-in strip the length of which is adequate for transfer by said transfer means from said discharge end of said first section to said receiving end of said second section.
3. A paper machine according to claim 2, compri-sing a guiding member which is pivotable with the aid of power means about a substantially horizontal axis and which guide the pull-in strip to the said chopper means.
4. A paper machine according to claim 3, wherein the guiding member has substantially the shape of an inclined plane sloping downwards in a direction to facilitate the trans-fer of the pull-in strip.
5. A paper machine according to claim 3, wherein under the guiding member there are drive motors which drive the chopper means.
6. A paper machine according to claim 2 wherein the chopper means comprises rotary cutting elements.
7. A paper machine according to claim 6, wherein portions of the cutting elements project above and near a lower edge of a top surface of the guiding member.
8. A paper machine according to claim 6, wherein the cutting elements are in the form of circular blades.
9. A paper machine according to claim 2, wherein the guiding member is placed substantially immediately below a compressed air jet means.
10. A paper machine according to claim 2, wherein there are several chopper means side-by-side and adjacent to a lower edge of the guiding member.
11. A paper machine according to claim 2, further comprising pull-in aids to facilitate the guiding of the useful length of the pull-in strip.
12. A paper-making machine according to claim 11, wherein said pull-in aids consist of baffles.
13. A paper machine according to claim 11, wherein said pull-in aids consists of conveyor belts.
14. In a method of operating a paper machine, the steps of providing at the end of one section of the paper machine a pull-in strip to be used in conducting a web from said one section to the next section of the machine, with said pull-in strip initially hanging down from the end of said one section while travelling downwardly toward a part of the machine, then transferring the pull-in strip from said one section to said next section with said pull-in strip being in the form of a single layer which is not double folded, and, prior to said transferrring step, continuously chopping the pull-in strip into relatively small portions which continue to travel down to said part of the machine while leaving above the location where the chopping of the pull-in strip occurs a pull-in strip portion having a length sufficiently great for transfer to said next section.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI760855A FI52478C (en) | 1976-03-31 | 1976-03-31 | A device for facilitating the guidance of the web end of a paper machine. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1066102A true CA1066102A (en) | 1979-11-13 |
Family
ID=8509872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,115A Expired CA1066102A (en) | 1976-03-31 | 1977-03-30 | Means and method for easy conduction of the web end in a paper machine |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS52121506A (en) |
| AT (1) | AT354839B (en) |
| BR (1) | BR7701916A (en) |
| CA (1) | CA1066102A (en) |
| DE (1) | DE2714161C3 (en) |
| FI (1) | FI52478C (en) |
| FR (1) | FR2346491A1 (en) |
| GB (1) | GB1530874A (en) |
| IT (1) | IT1076294B (en) |
| NO (1) | NO771117L (en) |
| SE (1) | SE7703733L (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS544804U (en) * | 1977-06-06 | 1979-01-12 | ||
| FI62695C (en) * | 1981-05-15 | 1983-02-10 | Valmet Oy | PAPER MACHINERY FOR PAPER MACHINERY AND PAPER MACHINERY |
| JPH0116800Y2 (en) * | 1985-10-28 | 1989-05-17 | ||
| US4671151A (en) * | 1985-12-13 | 1987-06-09 | Fibron Machine Corporation | Paper tail cutter |
| JPS63115098U (en) * | 1987-01-19 | 1988-07-25 | ||
| US4945655A (en) * | 1987-02-13 | 1990-08-07 | Beloit Corporation | Apparatus for cutting a tail from a web |
| US5404653A (en) | 1987-02-13 | 1995-04-11 | Beloit Technologies, Inc. | Apparatus for drying a web |
| US5507104A (en) | 1987-02-13 | 1996-04-16 | Beloit Technologies, Inc. | Web drying apparatus |
| DE3924897A1 (en) * | 1989-07-27 | 1991-02-07 | Escher Wyss Gmbh | Leader transfer - has swing jet mechanism to separate leader from roller and transfer it to onwards cable conveyor |
| US5234172A (en) * | 1991-02-01 | 1993-08-10 | The Black Clawson Company | High pressure water jet comminuting |
| DE19502240C3 (en) * | 1995-01-25 | 2003-10-09 | Wifag Maschf | Method and device for drawing in a web of printing material in web-fed rotary printing |
| FI103425B1 (en) | 1997-11-14 | 1999-06-30 | Valmet Corp | Threading apparatus and method for inserting the end of the web |
-
1976
- 1976-03-31 FI FI760855A patent/FI52478C/en not_active IP Right Cessation
-
1977
- 1977-03-23 GB GB12169/77A patent/GB1530874A/en not_active Expired
- 1977-03-25 BR BR7701916A patent/BR7701916A/en unknown
- 1977-03-28 AT AT216177A patent/AT354839B/en not_active IP Right Cessation
- 1977-03-29 NO NO771117A patent/NO771117L/en unknown
- 1977-03-30 DE DE2714161A patent/DE2714161C3/en not_active Expired
- 1977-03-30 JP JP3475977A patent/JPS52121506A/en active Pending
- 1977-03-30 CA CA275,115A patent/CA1066102A/en not_active Expired
- 1977-03-31 IT IT21925/77A patent/IT1076294B/en active
- 1977-03-31 FR FR7709730A patent/FR2346491A1/en active Granted
- 1977-03-31 SE SE7703733A patent/SE7703733L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATA216177A (en) | 1979-06-15 |
| JPS52121506A (en) | 1977-10-13 |
| DE2714161A1 (en) | 1977-10-13 |
| DE2714161C3 (en) | 1980-04-24 |
| FR2346491B3 (en) | 1980-02-22 |
| SE7703733L (en) | 1977-10-01 |
| DE2714161B2 (en) | 1979-08-23 |
| FR2346491A1 (en) | 1977-10-28 |
| IT1076294B (en) | 1985-04-27 |
| FI52478B (en) | 1977-05-31 |
| BR7701916A (en) | 1978-01-24 |
| AT354839B (en) | 1979-01-25 |
| GB1530874A (en) | 1978-11-01 |
| FI52478C (en) | 1977-09-12 |
| NO771117L (en) | 1977-10-03 |
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