EP0340578B1 - Dispositif pour empêcher l'ondulation d'une feuille continue - Google Patents

Dispositif pour empêcher l'ondulation d'une feuille continue Download PDF

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Publication number
EP0340578B1
EP0340578B1 EP89107329A EP89107329A EP0340578B1 EP 0340578 B1 EP0340578 B1 EP 0340578B1 EP 89107329 A EP89107329 A EP 89107329A EP 89107329 A EP89107329 A EP 89107329A EP 0340578 B1 EP0340578 B1 EP 0340578B1
Authority
EP
European Patent Office
Prior art keywords
rod
bearings
web
bearing bed
bearing
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 - Lifetime
Application number
EP89107329A
Other languages
German (de)
English (en)
Other versions
EP0340578A1 (fr
Inventor
Dieter Steinbüchel
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.)
Zanders Feinpapiere AG
Original Assignee
Zanders Feinpapiere AG
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 Zanders Feinpapiere AG filed Critical Zanders Feinpapiere AG
Publication of EP0340578A1 publication Critical patent/EP0340578A1/fr
Application granted granted Critical
Publication of EP0340578B1 publication Critical patent/EP0340578B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs

Definitions

  • the present invention relates to a crushing doctor with improved properties for the treatment of web-like material, as is preferably used in cross-cutting machines, in order to eliminate the curl of the web.
  • Paper stored in rolls shows, with increasing storage time, a tendency to maintain the curvature in the running direction that it had in the roll even after the cross-cutting process in the sheet.
  • the tendency of the sheets of paper to warp therefore also increases as the roll diameter becomes smaller.
  • the thickness and structure of the web also have an influence. Cartons maintain a much stronger tendency to warp than paper.
  • the cross cutters for paper and cardboard webs are equipped with so-called crushing blades.
  • These are usually thin, hard rods, which are arranged like guide rollers for the paper web and are wrapped by it to a part of its circumference.
  • the rods can be rotated. With solid bars, grinding marks on such papers are inevitable.
  • the sizing effect of the doctor rod opposite to the tendency of the paper to warp is greater, the smaller its diameter and the greater the wrap through the paper web.
  • the tension with which the web is guided around the rod is also influential. The most intense effect would therefore be a sharp edge around which the web would be guided with the highest possible tension.
  • such an aid is unusable because of the unavoidable damage to the paper surface and the excessive sizing effect which leads to warping in the opposite direction.
  • thin, rotatable doctor blades are therefore customary as web finishing tools, which have diameters of 10 to 20 mm.
  • the rod is supported, in addition to roller bearings at the ends of the rod, by means of two rows of staggered rollers which are fastened on a rigid support (FIG. 1).
  • a disadvantage of this embodiment is that the embedding of the rod between the rollers allows little more than 90 ° wrap through the web, so the finishing effect is basically only moderate.
  • the surface of the rod is changed by the rollers so that streaking occurs on the surfaces of sensitive papers. The formation of the strips takes place particularly under the action of vibrations and the resulting impact of the rod on the rollers due to the very high speeds of the rod driven by the paper web. The vibrations can also cause the rod to pop out of its storage. Often the cause of these phenomena is the high wear rate of the roller bearings.
  • DE-B-1927376 describes a concept of a crushing doctor which offers greater operational reliability compared to the previously known constructions by preventing the tendency of the bars to vibrate and impact. This is done by the action of magnets on the rod, which are arranged alternately with bearing elements of the versions described above, preferably rollers.
  • magnets on the rod which are arranged alternately with bearing elements of the versions described above, preferably rollers.
  • a squeegee device has the disadvantage of a separate arrangement of damping and bearing elements, which still means There is banding on the paper surface.
  • the damping of the Rod vibrations due to magnetic action are also associated with a braking of the rod rotation, so that the increased slippage results in a greater friction which affects the paper surface.
  • a disadvantage of this rod storage is the low possible wrap; if, as suggested for light paper, thinner bars are used, it becomes even smaller.
  • This publication also contains a proposal for the embodiment of a crushing doctor in which the rod is supported by means of trough-shaped sliding bearings which are arranged alternately with magnets which prevent the doctor rod from jumping out of the bearing.
  • Sintered bronze is used as the bearing metal, through which an air film between the rod and the bearing metal is to be generated by means of compressed air supply through openings in the bearing housing.
  • this construction has not been introduced in practice.
  • the present invention has for its object to provide a crushing doctor device, which ensures an uncomplicated, reliable and effective mode of operation while maintaining the original surface aspect of the paper and avoids the disadvantages of the known embodiments.
  • a trough-shaped rod bearing made of bronze was used, which had holes in its base for the air supply and a groove that allowed air to be distributed in the longitudinal direction of the rod.
  • this rod deposit proved unsuitable for higher speeds.
  • An improvement in the running behavior of the rod by changing the air pressure was only possible to a small extent.
  • FIG. 2a / b / c The structure of the devices according to the invention is illustrated in FIG. 2a / b / c.
  • Figure 2a shows the device according to the invention in longitudinal section.
  • Figure 2 b shows the design of the storage in the cutout, and
  • Figure 2 c is a cross section through the device.
  • the doctor rod (1) made of steel lies in the trough-shaped bearing (2) which extends over its entire useful length and which encloses it at an angle of approximately 150 °.
  • the bearing (2) is held in the operating position by means of the rigid box-shaped supporting body (4), which is closed on all sides, and is supplied with compressed air via the bores (3).
  • the box-shaped support body (4) is connected to a compressed air source via the pipeline (5).
  • the arrangement of the device according to the invention in a cross cutting machine takes place in a known manner between two web guide rollers.
  • the wrapping of the doctor rod through the paper web - and thus its smoothing effect - can be changed by shifting in a direction perpendicular to the plane defined by the parallel axes of the two guide rollers (FIG. 3).
  • axial bearings (6) In order to generate the pretension of the doctor rod, its ends are inserted in guide bushes (8) which are firmly connected to them and these in turn are easily displaceable in axial bearings (6), preferably angular contact ball bearings.
  • the axial bearings (6) are fixed in the bearing housings (12) by means of circlips (11), which are attached to the ends of the box-shaped support body (4).
  • the ends of the doctor rod (1) with the guide bushings (8) on them protrude outwards beyond the axial bearings (6) in order to be able to accommodate the coil springs (7), which are pressed against the inner ring by means of the clamping nuts (9) the axial bearing (6) make the preload adjustable as required.
  • the mode of operation of a device according to the invention is illustrated by determining the operating conditions in an embodiment for the finishing of art paper of 90 to 250 g / m 2 in a cross cutter.
  • Paper art print 135 g / m2 Paper web width: 900 mm Web tension: 500-550 N
  • the device according to the invention is thus an aid for achieving perfectly flat paper formats, with improved effects compared to the prior art, in particular due to higher operational reliability through wear-resistant storage, ease of movement, and the risk of streaking on the paper, as is known in the case of doctor blade deposits with discrete support areas are the greatest possible usability of the rod doctor circumference for the web wrapping and accordingly a wide range of smoothing effects.
  • the possibility of arranging the device above or below horizontal or with any incline web trains is advantageous, which is made possible by the storage of the doctor rod under tension used.

Landscapes

  • Paper (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (5)

1. Dispositif destiné à éliminer le gondolage d'une matière en forme de bande, en particulier une bande en papier ou en carton, comportant une barre dure (1), qui peut tourner librement dans un lit de support en forme d'auge, dont les extrémités sont maintenues dans des paliers (6) en dehors du lit de support en forme d'auge (2), dont le carter (12) est relié de façon rigide au lit de raclette (2), et sur laquelle la matière en forme de bande est enroulée selon un angle pouvant atteindre 120°, la friction de palier pouvant être réduite par une amenée d'air comprimé au moyen d'orifices ménagés dans le fond du lit de support, caractérisé en ce que les extrémités de la barre (1) sont maintenues à coulissement axial dans les paliers (6) et en ce que les carters (12) des paliers (6) servent de contre-appuis à des éléments de sollicitation (7) qui agissent sur les extrémités de la barre (1) et exercent sur elle une sollicitation en traction et en ce qu'en outre le lit de support (2) est en une matière polymère.
2. Dispositif selon la revendication 1, caractérisé en ce que les éléments de sollicitation sont des ressorts en spirale (7), qui sont disposés sur des parties de la barre (1) qui font saillie au-dessus des paliers (6), et en ce que des écrous (9) sont comprimés sur les extrémités de la barre (1) contre l'anneau intérieur des paliers (6) réalisés sous forme de roulements à rouleaux, de préférence de roulements à billes à disposition oblique.
3. Dispositif selon les revendications 1 et 2, caractérisé en ce que le lit de support (2) est en une matière polymère possédant de bonnes propriétés de déplacement à sec pour des ondes en acier.
4. Dispositif selon la revendication 3, caractérisé en ce que la matière polymère du lit de support (2) est un polyamide à particules de sulfure de molybdène occluses.
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les orifices du fond du lit de support (2) débouchant dans une rainure longitudinale (13) dans le fond du lit de support (2) en forme d'auge.
EP89107329A 1988-05-04 1989-04-24 Dispositif pour empêcher l'ondulation d'une feuille continue Expired - Lifetime EP0340578B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3815125A DE3815125C1 (fr) 1988-05-04 1988-05-04
DE3815125 1988-05-04

Publications (2)

Publication Number Publication Date
EP0340578A1 EP0340578A1 (fr) 1989-11-08
EP0340578B1 true EP0340578B1 (fr) 1991-09-18

Family

ID=6353577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107329A Expired - Lifetime EP0340578B1 (fr) 1988-05-04 1989-04-24 Dispositif pour empêcher l'ondulation d'une feuille continue

Country Status (2)

Country Link
EP (1) EP0340578B1 (fr)
DE (2) DE3815125C1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113479679A (zh) * 2020-04-07 2021-10-08 陆才军 一种塑料薄膜裁剪设备的使用方法
DE102022127648A1 (de) 2022-10-20 2024-04-25 Voith Patent Gmbh Breitstreckvorrichtung für eine Maschine zum Auf- und Umwickeln einer Materialbahn
CN116986370B (zh) * 2023-09-21 2023-11-28 江苏德励达新材料股份有限公司 一种聚氨酯材料卷绕包装机构

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549932A (en) * 1981-04-27 1985-10-29 Appleton Papers, Inc. Apparatus and process for a decurling system
US4539072A (en) * 1984-01-31 1985-09-03 Beloit Corporation Curl neutralizer

Also Published As

Publication number Publication date
EP0340578A1 (fr) 1989-11-08
DE3815125C1 (fr) 1989-11-23
DE58900292D1 (de) 1991-10-24

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