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Dokumentenidentifikation EP1629954 06.12.2007
EP-Veröffentlichungsnummer 0001629954
Titel Verfahren und System zur Regelung der Walzspalte eines Kalanders
Anmelder The Goodyear Tire & Rubber Co., Akron, Ohio, US
Erfinder Downing, Daniel Ray, Uniontown, OH Ohio 44685, US
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 602005002991
Vertragsstaaten DE, ES, FR
Sprache des Dokument EN
EP-Anmeldetag 19.08.2005
EP-Aktenzeichen 051076453
EP-Offenlegungsdatum 01.03.2006
EP date of grant 24.10.2007
Veröffentlichungstag im Patentblatt 06.12.2007
IPC-Hauptklasse B29C 43/22(2006.01)A, F, I, 20060220, B, H, EP
IPC-Nebenklasse F16C 13/00(2006.01)A, L, I, 20060220, B, H, EP   D21G 1/02(2006.01)A, L, I, 20060220, B, H, EP   

Beschreibung[en]
Field of the Invention

The present invention relates in general to calender systems, and more specifically to calender systems having a fine gauge adjustment.

Background of the Invention

Calendering systems are often used by manufacturers to process textiles, paper or rubber in various stages of the tire making process. Many prior art systems lack the capability to fine tune the gauge of the part being calendered. Typically the control of the gauge is done through adjusting the distance between the centerlines of the calender rolls. One way to accomplish this is by varying the temperature of the calender rolls, by either heating or cooling the rolls. However, this method has the disadvantage of affecting the processing of the rubber by adversely moving away from the optimal roll temperature. Another method of controlling the gauge is by running a draw or by changing the draw so that one roll spins faster than the other roll. However, this method has the disadvantage of causing additional stress to the rubber, which contributes to distortion and snap back. Another method of controlling the gauge is by machining the calender roll to decrease its diameter, thereby increasing the gauge. This method is time consuming and costly, and can only increase the gauge of the part, not decrease it.

Thus an improved method and apparatus is desired which allows the fine adjustment of the calender gap so that the gauge of the component can be adjusted.

DE 42 09 712 A1 describes a calender system having a gauge adjustment comprising a first and second roller wherein that rollers each have a first and second end mounted in opposed end supports and wherein one of that end supports has an inlet and an outlet in fluid communication with one or more internal passages. In addition, there is provided a means for circulating a heat transfer medium through that one or more internal passages.

US-A- 4,964,202 discloses a heatable roll for use in calenders wherein a cylindrical shell is rotatably mounted on a stationary carrier. The medium portion of the shell is heated by a heating device and the end portions of the shell are heated by a discrete second heating device having channels which are provided in the end portions of the shell.

Summary of the Invention

The invention provides in a first aspect a calender system suitable for processing a product to produce a desired gauge thickness, which has a fine gauge adjustment. The calender system comprises:

  • a first and second roller each having a first and second end mounted in opposed end supports, said end support each having an inlet and an outlet in fluid communication with one or more internal passages, wherein a heat transfer medium may be circulated through said one or more internal passages.

The invention provides in another aspect a method of adjusting a calender system having two or more rollers. The method comprises the steps of:

  • determining the desired gauge of the end product, determining the actual gauge of the end product, circulating a heat transfer fluid in one or more internal passages of the end supports or end support plates of the rollers, and adjusting the temperature of the heat transfer medium until the desired gauge has been reached.

Dependent claims cover preferred embodiments of the invention.

Brief Description of the Drawings

The invention will be described by way of example and with reference to the accompanying drawings in which:

  • Figure 1 is a perspective view of a calendering system;
  • Figure 2 is an end view of the end support of the upper frame of the calender system of Figure 1;
  • Figure 3 is an end view of the end support of Figure 2;
  • Figure 4 is a top view of the frame of Figure 2;
  • Figure 5 is a side view of the end support of Figure 2; and
  • Figure 6 is a cross-sectional view of the end support taken in the direction 6-6 of Figure 4.

Detailed Description of the Invention

Turning to the drawings and in particular Figures 1-4, there is illustrated a calendering system 10 embodying improvements especially suited for calendering rubber, although the invention is applicable to other applications. The calendering system comprises a frame including a lower frame 14, and an upper frame 16 mounted to the lower frame 14. The lower frame 14 includes a plurality of support legs 18. The upper frame 16 is connected to the lower frame 14 and includes two opposed end supports 20, such as end support plates, for supporting a pair of rollers 30. One of the end supports 20 is fixed to the upper frame 16, while the opposite end support is preferably slidably mounted to the upper frame, to allow for adjustment. Each end support 20 further comprises a pair of rotatable hubs 22 mounted in parallel alignment, which are aligned with the rotatable hubs on the opposed end support for supporting a roller 30. Each hub 22 is received in an end of the roller. One of the hubs 22 for each roller 30 is connected to a drive shaft (not shown) which is driven by a motor 34. Each roller 30 may be rotated in the same or opposite direction of the adjacent roller, and at the same or different speeds.

Thus, there are two rollers 30 mounted in parallel alignment, and spaced closely apart a gap distance D. The present invention concerns the fine adjustment of the gap distance D, by precise adjustment and control of the distance C located between the centers of the rollers 30. In order to adjust the gap distance D, each end support 20 comprises one or more internal passages 40 for circulating a heat transfer medium such as water. The one ore or more internal passages 40 further comprise an inlet 42 and an outlet 44, so that the heat transfer medium may be circulated in an open loop through the end support 20. The one or more internal passages 40 are preferably located between the two centers of the rollers 30. Preferably, there are two sets of passages located between the roll centers, wherein one set of passages 40, 46 run in a first direction, while a second set of passages 48, 50 extend in a second direction different than the first direction. Preferably, the passages are strategically placed so that the end support 20 is responsive to temperature changes, and that there is a minimal temperature gradient over the entire end support.

The heat transfer medium may be heated or cooled to the desired temperature prior to circulation within the end supports. If it is desired to increase or decrease the gap distance D between the rollers 30, then the heat transfer medium may be heated or cooled, respectively. As the heat transfer medium travels through the one or more internal passages, the end support contracts or expands due to the temperature change. As the end support contracts or expands, the distance between the centers of the rolls also likewise contracts or expands, depending upon whether the heat transfer medium is cooling or heating the end support. Precise control of the gap distance may be achieved by controlling the temperature of the heat transfer medium.

The temperature of the heat transfer medium is preferably controlled by a temperature control unit (not shown) which is in electrical communication with a control mechanism (not shown). The desired gap distance or gauge of the material may be programmed into the controller. An active feedback loop may be utilized by the controller to maintain the gauge of the material by slightly varying the temperature of the heat transfer fluid. Thus for example, by varying the temperature of the heat transfer medium from 26.7 to 71.1 °C (80 to 160 degrees F), the gauge of the component may be varied up to 0.381 mm (0.015 inch).

The change in the gap distance D has a linear relationship with the coefficient of thermal expansion and the change in temperature of the end support plate, and is represented by the equation below.

Change in gap distance D (inches) = &agr; * L * &Dgr; T , where:

  • &agr; is the coefficient of thermal expansion in mm/(mm °C) (inch/(inch deg F))
  • L is the distance between the centers of the rollers 30, in mm (inches)
  • A T (in °C (deg F)) is the change in temperature of the end support 20.

In a second embodiment of the invention (not shown), the end support 20 may be heated by any other devices known to those skilled in the art, such as dielectric heating, radiant heating, induction heating or any other heating or cooling method known to those skilled in the art.

In a third embodiment of the invention, each end support 20 may be independently heated to different temperatures to counteract any undesired asymmetries in the produced part, or produce desired asymmetries in the produced part. For example, one side of the machine may be slightly different than the other side of the machine due to build up of machine tolerances.


Anspruch[de]
Kalandersystem mit einer Feinabstandsverstellung, wobei das Kalandersystem (10) eine erste und eine zweite Walze (30) umfasst und jede Walze ein erstes Ende, das in einem ersten Endlager (20) befestigt ist, und ein zweites Ende (20), das in einem zweiten Endlager befestigt ist, aufweist, wobei die Endlager (20) jeweils einen Einlass (42) und einen Auslass (44) in Fluidverbindung mit einem oder mehreren internen Durchgängen (40, 46) der Endlager (20) aufweisen und wobei ein Mittel zum Zirkulieren eines Wärmeübertragungsmediums durch den einen oder die mehreren internen Durchgänge vorgesehen ist. Kalandersystem nach Anspruch 1, wobei ein Mittel zum Erwärmen des ersten Endlagers auf eine andere Temperatur als jene des zweiten Endlagers vorgesehen ist. Kalandersystem nach zumindest einem der vorhergehenden Ansprüche, wobei der eine oder die mehreren internen Durchgänge (40, 46, 48, 50) zwischen den Mittellinien der ersten und zweiten Walze (30) angeordnet ist/sind. Kalandersystem nach zumindest einem der vorhergehenden Ansprüche, ferner umfassend eine Temperatursteuereinheit zum Steuern der Temperatur des Wärmeübertragungsmediums. Kalandersystem nach zumindest einem der vorhergehenden Ansprüche, wobei der eine oder die mehreren internen Durchgänge (40, 46, 48, 50) zwischen den Walzen (30) angeordnet ist/sind. Kalandersystem nach zumindest einem der vorhergehenden Ansprüche, umfassend eine Vielzahl von internen Durchgängen (40, 46, 48, 50), wobei einer der Durchgänge in einer ersten Richtung axial ausgerichtet ist, während ein zweiter interner Durchgang in einer Richtung axial ausgerichtet ist, die sich von der ersten Richtung unterscheidet. Verfahren zum Verstellen eines Kalandersystems mit einer ersten und einer zweiten Walze (30), die jeweils ein erstes Ende, das in einem ersten Endlager befestigt ist, und ein zweites Ende (20), das in einem zweiten Endlager befestigt ist, aufweisen, wobei die Endlager (20) jeweils einen Einlass (42) und einen Auslass (44) in Fluidverbindung mit einem oder mehreren internen Durchgängen (40, 46) der Endlager (20) aufweisen, um ein Wärmeübertragungsmedium zirkulieren zu lassen, wobei das Verfahren die Schritte umfasst: Bestimmen einer gewünschten Dicke eines Endprodukts; Bestimmen einer tatsächlichen Dicke des Endprodukts; zirkulieren Lassen des Wärmeübertragungsmediums in einem oder mehreren internen Durchgängen (40, 46, 48, 50) von zumindest einem der Endlager (20) der Walzen (30); und Einstellen der Temperatur des Wärmeübertragungsmediums, bis die gewünschte Dicke erreicht worden ist.
Anspruch[en]
A calender system having a fine gauge adjustment, wherein the calender system (10) comprises a first and second roller (30), each roller having a first end mounted in a first end support (20) and a second end (20) mounted in a second end support, wherein said end supports (20) each have an inlet (42) and an outlet (44) in fluid communication with one or more internal passages (40, 46) of the end supports (20), and wherein a means for circulating a heat transfer medium through said one or more internal passages (40, 46) is provided. The calender system of claim 1 wherein a means for heating said first end support to a different temperature than said second end support is provided. The calender system of at least one of the previous claims wherein the one or more internal passages (40, 46, 48, 50) are located between the centerlines of the first and second rollers (30). The calender system of at least one of the previous claims further comprising a temperature control unit for controlling the temperature of the heat transfer medium. The calender system of at least one of the previous claims wherein the one or more internal passages (40, 46, 48, 50) are located between the rollers (30). The calender system of at least one of the previous claims comprising a plurality of internal passages (40, 46, 48, 50), wherein one of said passages is axially aligned in a first direction, while a second internal passage is axially aligned in a direction different than said first direction. A method of adjusting a calender system having a first and second roller (30) each having a first end mounted in a first end support and a second end (20) mounted in a second end support, wherein said end supports (20) each have an inlet (42) and an outlet (44) in fluid communication with one or more internal passages (40, 46) of the end supports (20) for circulating a heat transfer medium, the method comprising the steps of: determining a desired gauge of an end product; determining an actual gauge of the end product; circulating the heat transfer medium in one or more internal passages (40, 46, 48, 50) of at least one of end supports (20) of the rollers (30); and adjusting the temperature of the heat transfer medium until the desired gauge has been reached.
Anspruch[fr]
Système de calandrage possédant un réglage fin de l'épaisseur, dans lequel le système de calandrage (10) comprend un premier et un deuxième rouleau (30), chaque rouleau possédant une première extrémité montée dans un premier support terminal (20) et une deuxième extrémité (20) montée dans un deuxième support terminal, lesdits supports terminaux (20) possédant chacun une entrée (42) et une sortie (44) mises en communication par fluide avec un ou plusieurs passages internes (40, 46) des supports terminaux (20), et dans lequel on prévoit un moyen pour la mise en circulation d'un agent de transfert de chaleur à travers lesdits un ou plusieurs passages internes (40, 46). Système de calandrage selon la revendication 1, dans lequel on prévoit un moyen pour chauffer ledit premier support terminal à une température différente de celle dudit deuxième support terminal. Système de calandrage selon au moins une des revendications précédentes, dans lequel lesdits un ou plusieurs passages internes (40, 46, 48, 50) sont situés entre les lignes médianes des premier et deuxième rouleaux (30). Système de calandrage selon au moins une des revendications précédentes, comprenant en outre une unité de réglage de la température pour régler la température de l'agent de transfert de chaleur. Système de calandrage selon au moins une des revendications précédentes, dans lequel lesdits un ou plusieurs passages internes (40, 46, 48, 50) sont disposés entre les rouleaux (30). Système de calandrage selon au moins une des revendications précédentes, comprenant plusieurs passages internes (40, 46, 48, 50), un desdits passages étant disposé en alignement axial dans une première direction, tandis que le deuxième passage interne est disposé en alignement axial dans une direction différente de ladite première direction. Procédé de réglage d'un système de calandrage possédant un premier et un deuxième rouleau (30) possédant chacun une première extrémité montée dans un premier support terminal (20) et une deuxième extrémité (20) montée dans un deuxième support terminal, lesdits supports terminaux (20) possédant chacun une entrée (42) et une sortie (44) mises en communication par fluide avec un ou plusieurs passages internes (40, 46) des supports terminaux (20) pour la mise en circulation d'un agent de transfert de chaleur, le procédé comprenant les étapes consistant à : déterminer une épaisseur désirée d'un produit final ; déterminer une épaisseur actuelle du produit final ; faire circuler l'agent de transfert de chaleur dans un ou plusieurs passages internes (40, 46, 48, 50) d'au moins un des supports terminaux (20) des rouleaux (30) ; et régler la température de l'agent de transfert de chaleur jusqu'à ce que l'on atteigne l'épaisseur désirée.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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