US20080163997A1 - Spring Doctor - Google Patents

Spring Doctor Download PDF

Info

Publication number
US20080163997A1
US20080163997A1 US10/599,061 US59906105A US2008163997A1 US 20080163997 A1 US20080163997 A1 US 20080163997A1 US 59906105 A US59906105 A US 59906105A US 2008163997 A1 US2008163997 A1 US 2008163997A1
Authority
US
United States
Prior art keywords
blade
doctor according
spring doctor
roll
spring
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.)
Abandoned
Application number
US10/599,061
Other languages
English (en)
Inventor
Kimmo Loippo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Runtech Systems Oy
Original Assignee
Runtech Systems Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Runtech Systems Oy filed Critical Runtech Systems Oy
Assigned to RUNTECH SYSTEMS OY reassignment RUNTECH SYSTEMS OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOIPPO, KIMMO
Publication of US20080163997A1 publication Critical patent/US20080163997A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes

Definitions

  • the present invention relates to a spring doctor, and more specifically to a doctor, which is used to scrape clean the various rolls of a machine used in the manufacture of paper.
  • doctor blade which is usually in the order of 75-85 mm-long and of the desired width, i.e. essentially the same width as the roll being doctored, rests with a specific force against the surface of the roll and cleans the surface of fibres and other materials adhering to it.
  • angle of contact of the blade relative to the surface of the roll is often in the order of 25 degrees when the blade is new, the angle of contact changes as the blade wears, so that the angle can be in the order of 35 degrees before the blade is replaced with a new one.
  • the length of present doctor blades is about 60 mm. Wear causes the surface pressure of the blade to change according to it.
  • wear margin/length of the blade As this will lead to problems arising from the deflection of the blade. Similar problems also arise if the pressure of the blade is increased, when the point of the blade will open and will no longer closely follow the surface of the roll. This results in a poorer doctoring result.
  • the present invention is intended to create a new, improved doctor-blade construction, with the aid of which the drawbacks besetting the prior art can be avoided and savings will become possible in the manufacture of paper.
  • FIG. 1 shows one blade carrier, blade holder, and blade according to the invention, when the blade is at its full size
  • FIG. 2 shows the same construction in a situation, in which the blade has worn more or less to a state in which it must be replaced.
  • the roll the surface of which is cleaned by the doctor blade, in marked in the figures with the reference number 2 .
  • the present case concerns a roll 2 with a relatively large diameter, the surface of which is only slightly curved in the figures.
  • the blade holder 1 has a more or less conventional construction. It is formed of a frame structure, which is permanently attached, for example, to the frame structure of the paper machine.
  • the frame 5 of the blade holder 1 has a lug 3 for a shaft 4 .
  • the blade holder 1 is pivoted around the shaft 4 , allowing the blade holder to be rotated to a limited extent around the shaft 4 according to the control.
  • the control is, in turn, provided by using hose-like components 6 and 7 , filled with a pressure medium, which act on the blade holder to rotate it in different directions, as they are located on different sides of the pivot.
  • the hoses 6 and 7 are supported between the body 5 and a suitable surface of the blade holder.
  • the actual doctor blade 8 is attached and suitable supported on the side of the blade holder 1 facing the roll.
  • the attachment is made in a conventional manner, with the aid of a loading plate 9 and a counter-plate 10 .
  • the blade construction 11 according to the prior art is shown by a broken line in FIG. 1 . In practice, this means that the doctor blade 11 is shorter than the blade according to the invention.
  • the blade according to the prior art is also of a straight construction.
  • the blade construction 8 according to the invention is made to be curved, which also means that the construction is made sturdy, compared to the doctor blade according to the prior art. Thanks to the non-buckling and essentially non-deflecting construction achieved, the doctor blade can be made clearly longer than a blade according to the prior art, which in turn means that replacement will be needed much less frequently than when using a traditional doctor blade. The savings will be considerable.
  • the construction according to the invention also achieves another advantage, which is that, by curving the doctor blade 8 as shown, and bending it slightly upwards, as shown by the reference number 12 , the angle of the blade relative to the surface 2 of the roll can be made to remain nearly constant over the entire operating life of the blade. This also brings savings, as separate measures are not required to adjust the angle. Similarly, the doctoring situation remains constant for the entire operating life of the doctor, because the angle, the contact surface, and the pressure will not change.
  • a protector plate suitable for the purpose can be attached behind the blade and will prevent dirt that may accumulate on the back of the blade from entering the blade holder.
  • FIG. 1 shows an example of such a protector plate, marked with the reference number 13 .
  • cleanliness is an extremely important factor in the inside of a hose-loaded holder. If solid dirt gets between the loading hose and the loading plate, it will cause a deviation in the loading profile of the blade. This will lead to uneven blade wear, a reduction in doctoring effect, possible entry of dirt into the paper, a deterioration in the moisture profile of the paper and, at the very least, a reduction in the production efficiency of the paper machine, due to web breaks.
  • the improvements in the doctor blade according to the invention bring considerable savings, because the use of this construction minimizes the operations that cause detriments to production.
  • the increases in the manufacture of the actual blade, and in the subsequent costs are only very small.
  • the blade according to the invention shown in the figures can be adapted in many ways.
  • the blade instead of the blade being curved over its entire length, it can also be made as a combination with a curved portion and also a straight portion.
  • a blade curved in two directions is also possible.
  • the radius of the curve can also be changed as desired over the length of the blade. It may also be sensible to make the blade with a varying thickness. Such an alternative, in which the blade thins towards its point may be particularly suitable.
  • Blades like that shown are usually manufactured from a composite material, which, in other words, is usually formed of a plastic-based matrix, to which reinforcement is added.
  • the reinforcement is normally of a fibrous material; aramid fibres, carbon fibres, kevlar, or similar.
  • the invention also permits the desired elasticity properties and stiffness to be achieved by altering the amount and orientation of the reinforcement. In other words, if desired, the properties can be altered by arranging more fibres in one part of the blade than in another, while similarly the fibres can be oriented in one direction or another in specific parts of the blade.
  • the shape and construction of the blade holder shown in the figures by way of example can differ even greatly from the model shown.
  • the invention is in no way restricted to the solution shown.
  • the pressure, exerted by the blade on the roll being doctored can by created in any way at all.
  • the means for creating the pressure need be in no way connected to the blade holder.
  • the pressure can be regulated by a microprocessor and be variable for the entire duration of the operation.

Landscapes

  • Paper (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Artificial Filaments (AREA)
  • Valve Device For Special Equipments (AREA)
  • Springs (AREA)
  • Pens And Brushes (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Cleaning In General (AREA)
US10/599,061 2004-03-25 2005-01-28 Spring Doctor Abandoned US20080163997A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20040453 2004-03-25
FI20040453A FI116797B (fi) 2004-03-25 2004-03-25 Jousikaavin
PCT/FI2005/000062 WO2005093156A1 (en) 2004-03-25 2005-01-28 Spring doctor

Publications (1)

Publication Number Publication Date
US20080163997A1 true US20080163997A1 (en) 2008-07-10

Family

ID=32039471

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/599,061 Abandoned US20080163997A1 (en) 2004-03-25 2005-01-28 Spring Doctor

Country Status (11)

Country Link
US (1) US20080163997A1 (zh)
EP (1) EP1727936B1 (zh)
JP (1) JP2007530801A (zh)
KR (1) KR20070004771A (zh)
CN (1) CN1934313A (zh)
AT (1) ATE428822T1 (zh)
BR (1) BRPI0509078A (zh)
CA (1) CA2560458C (zh)
DE (1) DE602005013934D1 (zh)
FI (1) FI116797B (zh)
WO (1) WO2005093156A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150122444A1 (en) * 2013-11-06 2015-05-07 Kadant Inc. Doctor blade holder systems

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2310976B1 (es) * 2007-07-11 2009-11-19 Jose Joaquin Amonarriz Azcolain Aparato rascador para la industria papelera.
FI119823B (fi) * 2007-10-10 2009-03-31 Metso Paper Inc Kaavinlaitteisto ja menetelmä rainanmuodostuskoneelle liikkuvan pinnan kaapimiseksi sekä teräpidin
CN101821450B (zh) * 2007-12-06 2013-04-24 卡登特网络体系股份有限公司 刮刀刀架
EP2403993B1 (en) * 2009-03-02 2013-01-23 Kadant Inc. Cleaning apparatus for processing a moving roll surface and method of providing such a cleaning apparatus
ES2521024T3 (es) * 2010-12-10 2014-11-12 Kadant Inc. Soporte de cuchilla doctor
CN104307777A (zh) * 2014-11-18 2015-01-28 苏州禾盛新型材料股份有限公司 Pcm生产涂漆用气囊式刮刀机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1945761A (en) * 1930-05-03 1934-02-06 Vickery Inc Doctor for paper-making machinery
US4549933A (en) * 1983-07-05 1985-10-29 Thermo Electron Corporation Doctor blade with non-homogeneous stiffness properties
US5117264A (en) * 1991-04-03 1992-05-26 Xerox Corporation Damage resistant cleaning blade
US6416843B1 (en) * 1997-09-11 2002-07-09 Metso Paper, Inc. Caring doctor blade and method for manufacture of same
US6687950B1 (en) * 1998-06-09 2004-02-10 Metso Paper, Inc. Doctor blade and blade holder comprising composite material and ceramic coating

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB355007A (en) * 1930-08-06 1931-08-20 Holtzmann & Cie Ag E Improvements in scraper blades for paper drying drums and like devices
JPS5831300U (ja) * 1981-08-26 1983-03-01 株式会社石津製作所 回転ドラム用ドクタ−ブレ−ド
AU742958B2 (en) * 1997-07-21 2002-01-17 Scorpio Conveyor Products (Proprietary) Limited Scraper blade for primary belt scraper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1945761A (en) * 1930-05-03 1934-02-06 Vickery Inc Doctor for paper-making machinery
US4549933A (en) * 1983-07-05 1985-10-29 Thermo Electron Corporation Doctor blade with non-homogeneous stiffness properties
US5117264A (en) * 1991-04-03 1992-05-26 Xerox Corporation Damage resistant cleaning blade
US6416843B1 (en) * 1997-09-11 2002-07-09 Metso Paper, Inc. Caring doctor blade and method for manufacture of same
US6687950B1 (en) * 1998-06-09 2004-02-10 Metso Paper, Inc. Doctor blade and blade holder comprising composite material and ceramic coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150122444A1 (en) * 2013-11-06 2015-05-07 Kadant Inc. Doctor blade holder systems
US9518359B2 (en) * 2013-11-06 2016-12-13 Kadant, Inc. Doctor blade holder systems

Also Published As

Publication number Publication date
ATE428822T1 (de) 2009-05-15
WO2005093156A1 (en) 2005-10-06
KR20070004771A (ko) 2007-01-09
JP2007530801A (ja) 2007-11-01
DE602005013934D1 (de) 2009-05-28
BRPI0509078A (pt) 2007-08-21
FI20040453A (fi) 2005-09-26
FI20040453A0 (fi) 2004-03-25
EP1727936B1 (en) 2009-04-15
CA2560458C (en) 2011-06-07
FI116797B (fi) 2006-02-28
EP1727936A1 (en) 2006-12-06
CA2560458A1 (en) 2005-10-06
CN1934313A (zh) 2007-03-21

Similar Documents

Publication Publication Date Title
CA2560458C (en) Spring doctor
JP4801162B2 (ja) スクレーパブレードおよびスクレーパブレードの製作方法
JP5642092B2 (ja) 製紙機の改善された脱水性能をもたらすシステムおよび方法
US5536312A (en) Doctor device
US6942734B2 (en) Treatment equipment
JP4448126B2 (ja) 複合材料構造の処理装置
EP2195486B1 (en) A doctor apparatus and a method for doctoring a moving surface in a web forming machine
KR20090125126A (ko) 종이의 크레이핑을 위한 장치 및 방법
US20090038760A1 (en) Glue distribution device of an embossing-lamination group
US20100221438A1 (en) Method and Device for Coating
EP2510152B1 (en) Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine
US20020153114A1 (en) Removable doctor blade holder
US2117032A (en) Doctor mechanism for rolls and cylinders
US9085131B1 (en) End seal for an ink chamber of a printing machine
US20160138223A1 (en) Doctor Device For Fiber Web Machine And Doctor Arrangement In Fiber Web Machine
JP2013529261A (ja) 繊維ウェブ機械用の真空機器及び真空機器を備える繊維ウェブ機械
JPS6158297B2 (zh)
WO1998027279A1 (en) Improved doctor blade assembly
US20020100355A1 (en) Knife arrangement for a granulator for granulating plastic ropes
FI126700B (fi) Patoterä
US20240084510A1 (en) Bracket for a pivot rod in a doctor arrangement and doctor arrangement for a fiber web machine
FI119389B (fi) Paperi- tai kartonkikoneen kaavari
WO2007096478A1 (en) Device for doctoring the belt of a belt roll
KR20170003510U (ko) 위생용지 절단 로울러용 블레이드 홀더와 블레이드
MXPA97004277A (en) Ink unit for print press and met

Legal Events

Date Code Title Description
AS Assignment

Owner name: RUNTECH SYSTEMS OY, FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LOIPPO, KIMMO;REEL/FRAME:018270/0843

Effective date: 20060911

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION