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
  • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
• • 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
  • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
  • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2240/00—Components
  • F05B2240/20—Rotors
  • F05B2240/202—Rotors with adjustable area of intercepted fluid
  • F05B2240/2022—Rotors with adjustable area of intercepted fluid by means of teetering or coning blades

Definitions

• Dosiers ⁇ stem for devices for coating material webs in particular paper or cardboard webs
• the invention relates to a metering system for devices for coating running material webs, in particular paper or cardboard webs, according to the preamble of patent claim 1.
• devices for coating paper or cardboard webs which have an application system for applying coating material in excess and a subsequent metering system with a doctor element which doctor the excess down to the desired coat weight.
• the application and dosing is either carried out directly on the web in an area in which it is deflected by a roller, or indirectly initially also on the
• Web deflecting roller which then transfers the metered film of coating material to the web.
• a generic metering system with a doctor rod is known, which is obtained from a doctor bed made of rubber-elastic material.
• the doctor bed is mounted in a holder which is connected to the machine frame and is supported on its rear side facing away from the doctor rod by a pressure hose. With this system the thickness of the metered film can be measured
• the relatively small adjustment range is caused by irregularities in the web and / or
• the object of the invention is to expand the adjustment range for the coat weight in a metering system of the generic type, in particular to be able to achieve higher coat weights with a uniform application.
• the contact pressure generated by the pressure hose it is possible to set the contact pressure generated by the pressure hose locally differently over the working width in order to compensate for system-related errors in order to equalize the coat weight.
• This extends the adjustment range for the stroke weight, since local irregularities no longer affect the entire working width when adjusting the stroke weight.
• Another advantage is that a different stroke weight can be set in individual areas, e.g. B. to compensate for fluctuations in thickness in a paper web or to achieve a smaller line thickness at the edges of the web.
• Figure 1 shows a longitudinal section through a metering system according to the invention
• Figure 2 shows a section of a cross section.
• the metering system shown in Figure 1 is part of a device for coating a paper or cardboard web, in which a pre-metered film of coating material is first produced on a roller 1 and then released from the latter in a press nip between the roller 1 and a further press roller to the web becomes.
• Roll 1 is therefore partially wrapped in the area not shown in Figure 1 by the web.
• Such coating devices are e.g. B. described in DE-A-34 17 487.
• the dosing system can also be used for direct dosing on a paper web, such as. B. shown in DE-A-30 22 955. Then the roller 1 is wrapped in the area shown in Figure 1 with the metering system of the paper or cardboard web.
• the metering system contains as a metering element a doctor rod 2 which is rotatably mounted in a doctor bed 3 which is partially open towards the roller 1 by means of a rotary drive.
• the diameter of the doctor rod 2 is 8 to 50 mm, preferably 10 mm to 25 mm, its length corresponds to the working width of the coating device, which can be up to 10 m. It is made of stainless steel and its outer surface is coated so that it is wear-resistant, e.g. B. chrome or coated with ceramic.
• the doctor bed 3 holding the doctor rod 2 is made of an elastic, preferably rubber-elastic material with a Shore hardness of approximately 80, in the present exemplary embodiment made of rubber.
• open channels 4 are incorporated into the doctor rod 1, into which water is introduced as a lubricant and cleaning agent during operation.
• the doctor bed 3 is mounted in a bed holder 5 which is open towards the roller 1 and has two dovetail-like widenings on its side facing the roller 1 in order to prevent the penetration of coating material into the holder 5.
• the squeegee bed 3 is supported in the holder 5 by a pressure hose 6, which extends across the working width and presses in the direction of the roller 1 and which is arranged in an adapted recess in the holder 5.
• the pressure hose 6 consists of individual separate pressure chambers 6.1 -6.4, which - as can be seen in FIG. 2 - each have their own compressed air supply 7. They can be supplied with compressed air separately so that separate pressures can be set in chambers 6.1 -6.4.
• the pressure hose 6 is preferably via a central one running parallel to the doctor rod 2
• the tube 6 can be arranged separately on the back of the doctor bed 3 or can be made in one piece with it.
• the individual pressure chambers 6.1 -6.4 are formed by - as shown in FIG. 2 - a series of pressure hoses 6.1 -6.4 are arranged in succession on the back of the doctor bed 3. Alternatively, a single pressure hose divided by partitions can also be used.
• the individual pressure chambers 6.1-6.4 have a length of approximately 300-500 mm measured parallel to the doctor rod 2. This length can be in critical areas, especially at the edges of the web, less and in non-critical areas, e.g. B. in the middle of the roller 1 or the web, be longer. In particular, it is also possible to arrange separate pressure chambers at the edges only in critical areas in order to be able to work with a lower hose pressure there.
• the hose 6 (or the hoses 6.1 -6.4) consists of a rubber-elastic material with the thinnest possible hose walls (wall thickness less than or equal to 3 mm), so that manufacturing inaccuracies do not have an effect on optimal positioning behavior and no hysteresis effects occur.
• the hose 6 has a height parallel to the tangent to the roller 1 of 20-50 mm and is designed as a flat hose, i. H. its thickness radial to the roller 1 is less than its height. If a divided pressure hose 6 is used, the partitions between the individual pressure chambers 6.1 - 6.4 are also rubber-elastic, preferably of the same
• the hose 6 is supported on its rear side facing away from the doctor bed 3 by a holder.
• the doctor bed 3 is mounted in the holder 5, which is limited in terms of friction and can be moved with as little friction as possible in the direction of the roller 1, said holder being clamped in a clamping beam 9 fastened to a supporting beam 8.
• the supporting beam 8 can be adjusted in the direction of the roller 1 in order to be able to set a preselected gap between the roller 1 or the web resting thereon and the doctor rod 2.
• the compressed air connections 7 are guided to the outside through bores in the rear of the holder 5 and connected to a compressed air supply (not shown) via controllable valves in order to be able to regulate an individual pressure in each chamber 6.1-6.4.
• An application system 11 is arranged in the direction of rotation of the roller 1 (arrow 10) in front of the metering system.
• a nozzle applicator with an applicator chamber 1 2 which is closed at its outlet end by the metering system.
• the application chamber 1 2 is delimited by an overflow plate 1 3 ending at a short distance from the roller 1, so that part of the coating material supplied via the adjustable feed channel 14 overflows on the inlet side to prevent the ingress of air and contaminants into the Prevent application chamber 1 1.
• a preselected gap between the doctor rod 2 and the roller 1 is first set by adjusting the supporting beam 8. Coating material in the application chamber 1 2 is then applied in excess to the roller 1, and the pressure chambers 6.1 -6.4 are also applied
• the process is carried out analogously if the application chamber 1 2 or another application system, eg. B. a roller application system, the coating material is applied directly to the web.
• the doctor rod 2 then lies on the web and doses the amount of coating material directly on the web in the manner described above.

Landscapes

• Coating Apparatus (AREA)
• Paper (AREA)
• Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6504169

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (24)

Citations (7)

Family Cites Families (2)

• 1993
  • 1993-12-06 DE DE4341341A patent/DE4341341C1/de not_active Expired - Fee Related
• 1994
  • 1994-11-24 AT AT95903275T patent/ATE175251T1/de not_active IP Right Cessation
  • 1994-11-24 DE DE59407565T patent/DE59407565D1/de not_active Expired - Fee Related
  • 1994-11-24 EP EP95903275A patent/EP0682728B1/de not_active Revoked
  • 1994-11-24 WO PCT/EP1994/003885 patent/WO1995016074A1/de not_active Application Discontinuation
  • 1994-11-24 ES ES95903275T patent/ES2128035T3/es not_active Expired - Lifetime
  • 1994-11-24 JP JP7515920A patent/JPH08506525A/ja active Pending
• 1995
  • 1995-08-04 FI FI953719A patent/FI100814B/fi not_active IP Right Cessation

Patent Citations (7)

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