GB2139258A - A fibre distribution method and device for a dry paper machine - Google Patents
A fibre distribution method and device for a dry paper machine Download PDFInfo
- Publication number
- GB2139258A GB2139258A GB8409936A GB8409936A GB2139258A GB 2139258 A GB2139258 A GB 2139258A GB 8409936 A GB8409936 A GB 8409936A GB 8409936 A GB8409936 A GB 8409936A GB 2139258 A GB2139258 A GB 2139258A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibre
- air
- distribution
- distribution element
- paper machine
- 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.)
- Withdrawn
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 230000007257 malfunction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/42—Multi-ply comprising dry-laid paper
Abstract
A dry paper machine fibre distribution method and device for the even distribution of fibres to achieve the formation of a web in the transverse direction. For the attainement of smooth fibre distribution the air/fibre mixture is led to one end of a long pipe-like distribution element (1) and the air/fibre mixture is blown out from the distribution element (1) with the aid of the air nozzles (2) in the essentially open side (5) of the element. The air nozzles (2) are spaced at 50-250 mm intervals. The air pressure coming to each nozzle (2) can be regulated with the aid of valve 3 and pressure can be read from meter 4. <IMAGE>
Description
SPECIFICATION
A fibre distribution method and device for a dry paper machine
The subject of this invention is a method and device for dry paper machine fibre distribution of the web in the transverse direction.
In the paper industry dry paper machine it is important to achieve he desired transverse fibre profile in the dry paper web to be made.
In order that a certain profile may be achieved the formation of the web must be under control and regulation over the full web width.
In the formation part of the stuff track of a conventional dry paper machine and fibre distribution equipment for the control of the transverse fibre distribution (the profile) are based on the use of either suction air control in the machine transverse direction e.g. by means of valves, or by use of a sheet or similar device in the machine transverse direction to control the secondary air used in forming the web.
The control of fibre distribution in the transverse direction is not usually very successful with these designs because mechanical control elements are not fundamentally very precise, since they are subject to malfunction and require servicing. In additiont their passive control mode makes them insensitive to local disturbance in the fibre air mixture, as in fibre bunching and other concentration malfunctions.
For the abovementioned reasons the distribution of fibres in the transverse direction using conventional equipment is not very successful, as the variations in the transverse direction of the web are typically 5-10%.
The purpose of this invention is to eradicate the aforementioned drawbacks and achieve a fibre distribution method and relevant equipment that distributes the fibre in the direction transverse to the formation wire evenly into the desired stuff track In order to achieve this effect it is characteristic to the method according to this invention that the air/fibre mixture is led into a long pipelike distribution element at one end, the air/fibre mixture being blown out of its essentially open side with the aid of the nozzles in the element.
It is characteristic to one advantageous mode of application according to the invention that the distribution of the air/fibre mixture while it is blown out of the distribution element is adjusted by separately regulating the air pressure of each nozzle.
It is characteristic to the method according to this invention applied to the distribution equipment of a dry paper machine, that the fibre distribution equipment consists of a long pipelike distribution element, to one end of which the air/fibre mixture can be led and from the essentially open side of which the air/fibre can be blown out and that the distribution element is furnished with air nozzles at 50-250 mm intervals. By regulation the blowing pressure of the air nozzles so that the air/fibre mixture blown into the distribution element is evenly distributed along its length, a control system free of mechanical operations is achieved, which in addition efficiently mixes the air/fibre mixture to disperse possible local fibre concentrations.
It is characteristic to several advantageous modes of application of fibre distribution equipment in accordance with the invention that the distribution element is formed of pipe cut along its longitudinal section. This is a simple and cheap means of achieving an operationally serviceable distribution element, in which the longitudinal cut form the gap through which the fibres directed to the wire are blown.
It is characteristic to several modes of application of fibre distribution equipment that the pressure of each air nozzle is regulated as desired by separately operated devices and measured by separate measuring elements.
The invention is described more precisely in the following example with the aid of reference to the accompanying drawings.
Figure 1 represents a cross-section of a distribution element in accordance with the invention in which the distribution element essentially consists of pipe cut along the longitudinal section and pressed to size somewhat from the sides.
Figure 2 represents the pipe illustrated in
Fig. 1 as seen from one side.
The air and fibre mixture is led in from one end of the distribution pipe 1 (in Fig. 2 for example from the right). The pipe is cut through along its entire length and pressed somewhat from the side to size soXthat a longitudinal opening 5 is formed in it. Blowing nozzles 2 are installed in pipe 1, typically at about 100 mm separation distances. The air pressure coming to each nozzle can be regulated with the aid of valve 3 and pressure can be read from meter 4. The feed lines to the nozzles are led outside pipe 4 in a separate casing 6.
The distribution speed of the air/fibre mixture led into pipe 1 is regulated by valves 3 which control the blow pressure of nozzles 2 to such a value that an equal quantity of fibres per unit time evenly leaves the opening 5 along the length of pipe 1. When the desired transverse fibre distribution has been achieved, the readings of meters 4 are recorded in order that the same result can be easily repeated at a later date.
To expert persons in this field it is clear that the various modes of application of the invention are not only limited to the example put forward above but may be varied within the framework of the patent claims hereinafter put forward.
Claims (7)
1. A fibre distribution method for a dry paper machine, in which method fibres are made to spread evenly in the web to be formed in a transverse direction, characterised in that the air/fibre mixture is led into a long pipe-shaped distribution element (1) from one end and that the fibre/air mixture is blow out from the distribution element (1) from its essentially open side (5) by means of the air nozzles (2) in the element.
2. A method in accordance with Patent
Claim 1 characterised in that the distribution of the air/fibre mixture in its leaving the distribution element (1) is regulated by adjusting the said blowing pressure of all the air nozzles (2) separately.
3. A dry paper machine fibre distribution element intended to be realised in accordance with either Patent Claim 1 or 2 characterised in that the fibre distribution unit consists of a long pipe-shaped distribution element (1) to one end of which is led the air/fibre mixture to be distributed and from the essentially open side (5) which the air/fibre is exited, and that the distribution element (1) is furnished with air nozzles (2) at 50-250 mm separation distances.
4. A fibre distribution element in accordance with Patent Claim 3, characterised in that the distribution element is composed of longitudinally cut pipe.
5. A fibre distribution element according to Patent Claim 3-4, characterised in that the pressure of each air nozzle (2) is adjustable as desired by separate operating devices (3) and measured by separate measuring element (4).
6. A fibre distribution method substantially as hereinbefore described with reference to the accompanying drawing.
7. A dry paper machine fibre distribution element substantiall as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI831344A FI831344L (en) | 1983-04-20 | 1983-04-20 | FIBERFOERDELNINGSFOERFARANDE OCH - ANORDNING FOER EN TORRPAPPERMASKIN. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8409936D0 GB8409936D0 (en) | 1984-05-31 |
| GB2139258A true GB2139258A (en) | 1984-11-07 |
Family
ID=8517078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8409936A Withdrawn GB2139258A (en) | 1983-04-20 | 1984-04-17 | A fibre distribution method and device for a dry paper machine |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU2710784A (en) |
| DE (1) | DE3414687A1 (en) |
| FI (1) | FI831344L (en) |
| GB (1) | GB2139258A (en) |
| NO (1) | NO841577L (en) |
| SE (1) | SE8402207L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200201351A1 (en) * | 2018-12-19 | 2020-06-25 | Waymo Llc | Model for Excluding Vehicle from Sensor Field Of View |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB907257A (en) * | 1959-11-11 | 1962-10-03 | Asea Ab | Means for producing mats of fibrous material |
| GB1134685A (en) * | 1965-01-21 | 1968-11-27 | Saint Gobain | Improvements in the manufacture of sheets of thermoplastic fibres for example glassfibres |
| GB1244753A (en) * | 1967-07-07 | 1971-09-02 | Du Pont | Non woven fabrics |
| GB1371546A (en) * | 1971-11-08 | 1974-10-23 | Kendall & Co | Method and apparatus for making non-woven fibrous webs |
| GB1423637A (en) * | 1973-04-27 | 1976-02-04 | Johns Manville | Purging system and method for producing glass fibre blankets |
| EP0072301A1 (en) * | 1981-08-06 | 1983-02-16 | Isover Saint-Gobain | Process and device for improving fibre mat formation conditions |
-
1983
- 1983-04-20 FI FI831344A patent/FI831344L/en not_active Application Discontinuation
-
1984
- 1984-04-17 GB GB8409936A patent/GB2139258A/en not_active Withdrawn
- 1984-04-18 DE DE19843414687 patent/DE3414687A1/en not_active Withdrawn
- 1984-04-18 NO NO841577A patent/NO841577L/en unknown
- 1984-04-19 AU AU27107/84A patent/AU2710784A/en not_active Abandoned
- 1984-04-19 SE SE8402207A patent/SE8402207L/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB907257A (en) * | 1959-11-11 | 1962-10-03 | Asea Ab | Means for producing mats of fibrous material |
| GB1134685A (en) * | 1965-01-21 | 1968-11-27 | Saint Gobain | Improvements in the manufacture of sheets of thermoplastic fibres for example glassfibres |
| GB1244753A (en) * | 1967-07-07 | 1971-09-02 | Du Pont | Non woven fabrics |
| GB1371546A (en) * | 1971-11-08 | 1974-10-23 | Kendall & Co | Method and apparatus for making non-woven fibrous webs |
| GB1423637A (en) * | 1973-04-27 | 1976-02-04 | Johns Manville | Purging system and method for producing glass fibre blankets |
| EP0072301A1 (en) * | 1981-08-06 | 1983-02-16 | Isover Saint-Gobain | Process and device for improving fibre mat formation conditions |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200201351A1 (en) * | 2018-12-19 | 2020-06-25 | Waymo Llc | Model for Excluding Vehicle from Sensor Field Of View |
| US11693423B2 (en) * | 2018-12-19 | 2023-07-04 | Waymo Llc | Model for excluding vehicle from sensor field of view |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3414687A1 (en) | 1984-11-29 |
| FI831344A0 (en) | 1983-04-20 |
| NO841577L (en) | 1984-10-22 |
| FI831344L (en) | 1984-10-21 |
| GB8409936D0 (en) | 1984-05-31 |
| SE8402207L (en) | 1984-10-21 |
| SE8402207D0 (en) | 1984-04-19 |
| AU2710784A (en) | 1984-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |