EP0864691A1 - Réduction d'usure pour une râcle dans une machine à enduire le papier - Google Patents
Réduction d'usure pour une râcle dans une machine à enduire le papier Download PDFInfo
- Publication number
- EP0864691A1 EP0864691A1 EP98301538A EP98301538A EP0864691A1 EP 0864691 A1 EP0864691 A1 EP 0864691A1 EP 98301538 A EP98301538 A EP 98301538A EP 98301538 A EP98301538 A EP 98301538A EP 0864691 A1 EP0864691 A1 EP 0864691A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- paper
- mist
- coolant liquid
- doctor blade
- 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- Withdrawn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
- 239000011248 coating agent Substances 0.000 title claims abstract description 20
- 238000000576 coating method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000002826 coolant Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000003595 mist Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000008199 coating composition Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- -1 steam Substances 0.000 description 1
Images
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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
Definitions
- the present invention concerns a method and apparatus for reducing the rate of wear of a doctor blade in a paper coating machine.
- a doctor blade is employed in a paper coating machine for removing surplus coating composition and smoothing and levelling the film of coating composition which has been applied to a surface of a moving web of paper.
- doctor blade which is usually made of spring steel and is relatively thin so that it has a degree of flexibility which enables it to conform approximately to the coated surface of the paper web and to bend to open up a narrow slit between the upper surface of the paper web and the edge of the blade which determines the thickness of the film of coating composition which is allowed to remain on the surface of the web.
- the edge of the blade is biased by suitable means against the upper surface of the web, which is supported on a roll which is generally provided with an outer surface of a resilient material such as rubber or other elastomeric material.
- the magnitude of the biasing force which is applied determines the width of the slit which opens up, and hence the thickness, or weight per unit area, of the coating which remains on the surface of the paper web.
- the length of the doctor blade is generally made to be greater than the length of the backing roll on which the moving paper web is supported. Typically, the ends of the doctor blade might overhang the ends of the backing roll by about 10mm on each side. Also, the width of the paper web is generally arranged to be less than the length of the backing roll. Again, typically, the edges of the paper web fall short of the ends of the backing roll by about 10mm. Furthermore, the width of the area of the web of paper which is actually coated with the wet coating composition is less than the width of the paper web. An uncoated margin usually of approximately 10mm in width generally exists at each of the edges of the paper web.
- EP-A-460,771 describes a process and apparatus for eliminating or alleviating the problem of 'stalagmite' formation on the immediate downstream side of a doctor blade.
- the solution is to supply a fluid which will inhibit the formation of stalagmites.
- the fluid, steam, water or a steam/water mixture is supplied in an evenly distributed manner across substantially the width of the downstream side of the doctor blade. No special treatment at the ends of the doctor blade is suggested.
- apparatus for cooling a selected region of a doctor blade of a paper coating machine comprises an atomiser head which is rigidly mountable in such a way as to direct a mist of coolant liquid droplets on to the selected region of the doctor blade, means for supplying a gas and a coolant liquid to the atomiser head under controlled conditions of flow rate and pressure to form the said mist and facing wall members mounted so as to enclose the atomiser head and define a region in which the blade is to be contacted by the mist of liquid droplets.
- a stream of a gas is also directed on to the selected region of the doctor blade.
- the gas is conveniently air from a compressed air supply which is passed through a suitable device which removes energy from a stream of the air and thus lowers the temperature thereof.
- the atomiser head of each apparatus is, in use, desirably located relative to the doctor blade in such a manner that the coolant mist provided from the atomiser head of each apparatus is directed onto the blade in its selected regions on the underside surface of the blade, ie the surface facing the paper passing under the blade.
- a device 1 for cooling a selected region of the doctor blade 2 of a paper coating machine is mounted on a top edge of a wall 3 of a pan 4 which contains a paper coating composition.
- a web of paper (not shown) is supported and advanced in a clockwise direction by a backing roll 5, and coating composition is applied to one surface of the web of paper by means of an applicator device which is indicated diagrammatically at 6.
- the device 1 is arranged to cool the underside of the blade 2, ie the surface of the blade 2 facing the roll 5 in the selected region of the blade 2.
- the doctor blade 2 is mounted on supporting means 7 which can also apply a force which biases the blade against the backing roll and against the web of paper supported thereon.
- the cooling device 1 comprises an enclosure 8 in the form of an open-topped box having two side walls 9 and 10, a front wall 11, a rear wall 12 and a base plate 13. Flexible rubber sealing strips 14 and 15 are sandwiched between the side walls 9 and 10 and side plates 16 and 17, the sealing strips 14, 15 each having a bevelled edge 18 which contacts the surface of the backing roll 5, and makes a waterproof seal therewith. On each side the assembly of side wall, sealing strip and side plate is held together by a nut and bolt assembly 19.
- the rear wall 12 of the enclosure 8 is provided with two fixing holes 20, which enable the cooling device 1 to be secured to the supporting means 7 for the doctor blade 2.
- Figure 4 shows the position of the cooling device relative to the blade 2 and roll 5 and paper thereon.
- the blade 2 contacts paper 31 of a moving web running over the roll 5.
- the ends of the roll 5 overlap the width of the paper 31.
- the paper 31 has a region 33 which has been coated and has dry, uncoated edges 35, 37 at the sides of the region 33.
- the blade 2 which is longer than the roll 5 becomes hot and wears especially where it contacts the dry paper edges 35, 37.
- the cooling device and method embodying the invention substantially lubricates and reduces the temperature of the blade edge where it is in contact with rapidly moving dry paper, and the effective life of a blade is thus considerably prolonged so that a very advantageous reduction in the frequency of shut-downs of the paper coating machine is achieved without the use of excessive amounts of coolant liquid.
Landscapes
- Paper (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9705332.6A GB9705332D0 (en) | 1997-03-14 | 1997-03-14 | Reducing doctor blade wear in a paper coating machine |
| GB9705332 | 1997-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0864691A1 true EP0864691A1 (fr) | 1998-09-16 |
Family
ID=10809250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98301538A Withdrawn EP0864691A1 (fr) | 1997-03-14 | 1998-03-03 | Réduction d'usure pour une râcle dans une machine à enduire le papier |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0864691A1 (fr) |
| GB (1) | GB9705332D0 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002031262A1 (fr) * | 2000-10-13 | 2002-04-18 | Metso Paper, Inc. | Procede et dispositif de couchage |
| US7517407B2 (en) * | 2004-08-16 | 2009-04-14 | Hansol Paper Co., Ltd. | Cooling system and method for a paper coating device in a papermaking apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03213599A (ja) * | 1990-01-11 | 1991-09-18 | Ishikawajima Harima Heavy Ind Co Ltd | ブレードコータ |
| EP0460771A1 (fr) * | 1990-06-08 | 1991-12-11 | KNP Papier B.V. | Appareil et procédé pour empêcher la formation de stalagmite lors du couchage du papier |
| DE4303315A1 (en) * | 1993-02-05 | 1993-06-24 | Voith Gmbh J M | Paper-making roller scraper - acts together with moist air to reduce blade wear |
| EP0603145A1 (fr) * | 1992-12-15 | 1994-06-22 | Valmet Paper Machinery Inc. | Procédé et équipement d'enduction d'un rouleau d'une presse encolleuse à film |
| EP0645490A1 (fr) * | 1993-09-23 | 1995-03-29 | Valmet Paper Machinery Inc. | Procédé et équipement pour lubrifier la lame d'une raclette dans une machine à papier ou carton |
| JPH09209286A (ja) * | 1996-01-25 | 1997-08-12 | Ishikawajima Harima Heavy Ind Co Ltd | セラミックス溶射プレスロール用ドクタ装置 |
-
1997
- 1997-03-14 GB GBGB9705332.6A patent/GB9705332D0/en active Pending
-
1998
- 1998-03-03 EP EP98301538A patent/EP0864691A1/fr not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03213599A (ja) * | 1990-01-11 | 1991-09-18 | Ishikawajima Harima Heavy Ind Co Ltd | ブレードコータ |
| EP0460771A1 (fr) * | 1990-06-08 | 1991-12-11 | KNP Papier B.V. | Appareil et procédé pour empêcher la formation de stalagmite lors du couchage du papier |
| EP0603145A1 (fr) * | 1992-12-15 | 1994-06-22 | Valmet Paper Machinery Inc. | Procédé et équipement d'enduction d'un rouleau d'une presse encolleuse à film |
| DE4303315A1 (en) * | 1993-02-05 | 1993-06-24 | Voith Gmbh J M | Paper-making roller scraper - acts together with moist air to reduce blade wear |
| EP0645490A1 (fr) * | 1993-09-23 | 1995-03-29 | Valmet Paper Machinery Inc. | Procédé et équipement pour lubrifier la lame d'une raclette dans une machine à papier ou carton |
| JPH09209286A (ja) * | 1996-01-25 | 1997-08-12 | Ishikawajima Harima Heavy Ind Co Ltd | セラミックス溶射プレスロール用ドクタ装置 |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 015, no. 488 (C - 0893) 11 December 1991 (1991-12-11) * |
| PATENT ABSTRACTS OF JAPAN vol. 097, no. 012 25 December 1997 (1997-12-25) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002031262A1 (fr) * | 2000-10-13 | 2002-04-18 | Metso Paper, Inc. | Procede et dispositif de couchage |
| JP2004511671A (ja) * | 2000-10-13 | 2004-04-15 | メッツォ ペーパー インコーポレイテッド | 被覆方法および被覆装置 |
| DE10196789B4 (de) * | 2000-10-13 | 2013-01-31 | Metso Paper, Inc. | Beschichtungsverfahren |
| US7517407B2 (en) * | 2004-08-16 | 2009-04-14 | Hansol Paper Co., Ltd. | Cooling system and method for a paper coating device in a papermaking apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9705332D0 (en) | 1997-04-30 |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| 17P | Request for examination filed |
Effective date: 19980311 |
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| AK | Designated contracting states |
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| AX | Request for extension of the european patent |
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| AKX | Designation fees paid |
Free format text: DE FI FR GB IT SE |
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| RBV | Designated contracting states (corrected) |
Designated state(s): DE FI FR GB IT SE |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20011109 |