Paper machine using metal screen for press section and dryer cylinders

Information

  • Patent Grant
  • 6497792
  • Patent Number
    6,497,792
  • Date Filed
    Monday, October 15, 2001
    22 years ago
  • Date Issued
    Tuesday, December 24, 2002
    21 years ago
Abstract
Described is a machine for manufacturing a continuous web, in particular a paper or cardboard web, the machine having a number of rolls that may include press rolls, drying cylinders, suction rolls, or the like. At least one transport belt is guided with the web around the rolls and is characterized by the fact that a metallic screen is guided between the web and the respective roll surface. The metallic screen may be formed of metal, formed as a metallized drying screen, or formed from metal and synthetic threads.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




The present invention relates to a machine for manufacturing a continuous web, in particular a paper or cardboard web.




2. Discussion of Background Information




Machines of this type typically include a plurality of rolls such as press rolls, drying cylinders, suction rolls or the like.




Machines of the type mentioned above are known. In the manufacturing of continuous webs, a number of rolls are used, for example: press rolls, drying cylinders, or suction rolls. The web is guided over the surface of the rolls with the aid of at least one transport belt, which is also denoted as a screen or felt. It is also known that at high speeds of operation, for example from over 1000 m/min to more than 2000 m/min, that the tendency of the web to adhere to the surface of the rolls of a manufacturing machine leads to web tears. At any rate, the quality of the finished web is negatively affected by the adhesion tendency.




SUMMARY OF THE INVENTION




According to the present invention, a machine has been developed for manufacturing a continuous web that does not exhibit the above-noted disadvantage.




This is accomplished by such a machine that includes a plurality of rolls, such as press rolls, drying cylinders, or suction rolls. The web is guided over the surface of the rolls by at least one transport belt. At least one screen, such as a metallic screen, is guided between the web and the respective roll surface. The metallic screen may be made either completely out of steel or other metal or formed as a metallized drying screen. Moreover, it is possible to form the screen of metal and synthetic threads. By guiding the screen between the web and the surface of the rolls, the adhesion tendency of the web is reduced. The embodiments that are referred to in the following generally use a metallic screen of the kind mentioned previously.




A preferred embodiment of the machine is characterized in that a separate metallic screen is assigned to one, several, or all the rolls. In such an embodiment, a relatively uncomplicated screen construction is possible, so that construction expenditures can be reduced or limited.




Furthermore, a preferred embodiment of the machine is characterized in that the metal screen is usable in a drying section, in which the web, with the aid of at least one transport belt, is guided around one or more rolls that are designed as drying cylinders. Since the metal screen is guided directly on the surface of the drying cylinder or cylinders, an adhesion of the web to this surface is safely avoided.




Another preferred embodiment of the machine is one in which the metal screen is usable within the press section, in which the web, with the aid of at least one transport belt that is designed as a press screen, is guided over one or more rolls that are designed as press rolls. Other aspects of the present invention include, e.g., that a separate metallic screen may be assigned to at least one of the rolls; that each metallic screen may be guided such that the web is guided as it runs off the surface of a roll in a defined manner; that the surface of the metallic screen may be very finely structured; that the metallic screen may be porous; that the metallic screen can be heated, preferably shortly before the contact of the web; that at least one cleaning device may be provided for the metallic screen; and, that the metallic screen may have a thickness of less than approximately 1 mm, preferably less than about 0.1 mm.




Furthermore, the machine with the metallic screen in accordance with the present invention may be usable in a drying group of the machine, in which the web, with the aid of at least one transport belt, is guided around the rolls, which are designed as drying cylinders, and also, in which the web is guided through rolls that are designed as press rolls, where at least two of the press rolls define a press opening therebetween. The web and the metallic screen may be guided through one press opening or through two press openings.




According to another aspect of the present invention, the machine for manufacturing the continuous web includes a plurality of rolls, and at least one screen guided between the web and surfaces of the plurality of rolls. The machine may include a separate screen assigned to at least one of the rolls, and each screen may be guided such that the web is guided as it runs off the surface of a roll in a defined manner.




In accordance with a further aspects of the invention, at least one of the screens has a very finely structured surface, and, at least one screen is porous.




Additionally, the machine in accordance with the present invention may further include a heater positioned adjacent the screen, and may be located before a web contact point of the screen. The machine may also include at least one cleaning device for the screen. Other aspects of the present invention may include, e.g., the screen having a thickness of less than approximately 1 mm, preferably being less than about 0.1 mm.




Furthermore, the machine with the screen in accordance with the present invention may be usable in a drying group of the machine, in which the web is guided around the rolls, which may be designed as drying cylinders, and also in which the web is guided through rolls that are designed as press rolls, where at least two of the rolls define a press opening, or nip, therebetween. The web and the screen are guided through one press opening or through two press openings.




As noted above, the screen may be made of metal, or formed as a metallized drying screen. Moreover, it is possible to form the screen of metal and synthetic threads.




Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawings.











BRIEF DESCRIPTION OF THE DRAWINGS




The present invention is further described in the detailed description which follows, in reference to the noted drawings by way of non-limiting examples of preferred embodiments of the present invention, wherein same reference numerals represent similar parts throughout the several views of the drawings, and wherein:





FIG. 1

shows a schematic diagram of a part of a first embodiment of a machine for the manufacturing of a continuous web; and





FIG. 2

shows a schematic diagram of a part of a second embodiment of a machine for the manufacturing of a continuous web.











DETAILED DESCRIPTION OF THE INVENTION




The particulars shown herein are by way of example and for purposes of illustrative discussion of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.




The machine described as follows is generally usable for the manufacturing of a continuous web. It is especially suitable for the manufacturing of a paper or cardboard web. In the first embodiment it may be assumed that, as an example, the depicted machine is a paper manufacturing machine.




In

FIG. 1

, a part of machine


1


is depicted, which serves in manufacturing of a web


3


, such as a paper web. Web


3


is fed from left to right, that is, in machine run direction, through the machine over a number of rolls, which can provide various functions.




In a first part of the machine, a so-called press section


5


, the web is guided through press nips (openings)


7




a


and


7




b,


which in this case are formed by two press rolls


9


and


11


. The web runs over a peripheral area of the first press roll


9


, which turns, e.g., counter-clockwise. It then runs through the press rolls and then lies on a peripheral area


10


of the surface of the second press roll


11


, which, e.g., turns clockwise. A first metal screen


13


lies directly on the peripheral area


10


of the second press roll


11


, over which the web


3


is guided. Thus, the web


3


does not come into direct contact with the peripheral area of the second press roll


11


.




Cooperating with the first and second press rolls


9


and


11


are additional rolls


15


and


17


, which are known in principle and will not, therefore, be described in any detail. It should be remembered that the additional rolls, in conjunction with the first and second press rolls, form press nips (openings)


7




a


and


7




b,


through which the web


3


is guided.




A first press felt


16


is guided between the first press roll


9


and the additional roll


15


, and a second press felt


18


is guided between the second press roll


11


and the additional roll


17


. The press felts run through the opening formed between -the press rolls and the additional rolls, and in so doing it absorbs moisture from the web.




The first metal screen


13


is guided into the opening


19


located between press rolls


9


and


11


. The second press roll


11


cooperates with the additional roll


17


such that the web


3


and the first metal screen


13


are guided together through the press opening


7




b.


Press roll


11


, which is surrounded by the metal screen


13


, should be able to absorb water and should include a porous, i.e., grooved or bored, roll surface.




The web


3


comes from the press section


5


into the so-called drying section


21


, which can include several drying groups. The first drying group


23


includes a roll designed as a drying cylinder


25


, over which the web is guided. The web


3


goes from the press section over a suitable guiding device, which essentially extends over the width of the web, and in this case over a so-called transfer foil


27


and over a web guide roll


29


to a first deflection roll


31


, and from there is guided onto the drying cylinder


25


. Another auxiliary attachment


32


, running over the web width, can be provided on the side of web


3


opposite the transfer foil


27


. Auxiliary attachment


32


may be designed as an infra-red, steam, and/or hot-air heating unit or a profiling unit.




The web guide roll


29


is arranged within the closed loop of the first metal screen


13


, so that the first metal screen


13


lies directly on a peripheral area of web guide roll


29


, and web


3


is arranged above the first metal screen


13


. A first transport belt


33


, which is designed as a drying screen or a drying felt, is also guided on the first web guide roll


29


. First transport belt


33


is also guided over the respective leading rolls


41


,


43


,


39


and


35


such that a closed loop is formed, whereby the first transport belt


33


is guided over the first deflection roll


31


and a peripheral area of the drying cylinder


25


. The web


3


is sandwiched between the first metal screen


13


and the first transport band


33


, and is therefore also safely guided in the vicinity of the transitional area between web guide roll


29


and the first deflection roll


31


as well as between the first deflection roll


31


and the drying cylinder


25


. Thus, there are no free stretches.




With the guiding of the first metal screen


13


suggested here, the first deflection roll


31


lies outside, and the drying cylinder


25


lies inside, the loop formed by the first metal screen


13


, so that the first metal screen therefore lies directly on a peripheral area


45


of the drying cylinder


25


. The web


3


is pressed onto the peripheral area


45


by the first transport belt


33


, so that a low-loss heat transfer from the peripheral area


45


of the heated drying cylinder to the web can take place. The first transport belt


33


is carried away from the drying cylinder over the guide roll


37


at an angle of contact of approximately 120 degrees, while the first metal screen


13


and the web


3


are guided further on the drying cylinder. Both are guided onto a second deflection roll


47


, whereby a peripheral area


49


of the second deflection roll


47


and the peripheral area


45


of the first drying cylinder


25


are arranged at a distance to each other.




The web


3


is transferred by a so-called sandwich guidance in a transitional area between the drying cylinder


25


and the second deflection roll


47


by the first metal screen


13


and a second transport belt


33


′. That means that the web


3


lies between two belts running in the same direction, through which it is held securely, so that a transverse shrinkage is minimal. At the same time it is ensured, through the first metallic screen


13


that is guided under tension, that the web


3


does not cling to the peripheral area


45


of the drying cylinder


25


in the nip


51


, which is opening.




The second deflection roll


47


is a part of a second drying group


53


, which is included in drying section


21


. Both drying groups


23


and


53


have separate transport belts


33


and


33


′, which also, as noted previously, can be characterized as a drying screen or a drying felt. The second drying group


53


is comprised of two drying cylinders


55


and


57


, the centers of which lie at an imaginary level E


1


, at which the central point of the first drying cylinder


25


is also arranged. The centers of the first and second deflection rollers


31


and


47


lie below this level, as do the centers of a further, third deflection roll


59


, which is assigned to the second drying group


53


, at a second level E


2


. A simple support is thereby created.




The web


3


moves in a meandering manner around the drying cylinders


55


and


57


and the deflection rolls


47


and


59


of the second drying group


53


and is thereby additionally supported by a second metal screen


13


′, which is guided over suitable guide rolls such that both drying cylinders


55


and


57


lie within the loop of the second metal screen


13


′, and the third deflection roll


59


lies outside of it. The second metal screen


13


′ is guided directly on peripheral surfaces


61


and


63


of drying cylinders


55


and


57


and is under a pre-tension, to prevent adhesion of the web to the peripheral surfaces


61


and


63


. The second metal screen


13


′ removes the web


3


from the surfaces of the drying cylinders


55


and


57


to avoid adhesion.




In addition, the second transport belt


33


′ is guided by suitable guide rolls in a closed loop, whereby the second deflection roll


47


and the third deflection roll


59


lie within the loop and the drying cylinders


55


and


57


lie outside of the loop. Within the second drying group


53


, the web


3


, in the transitional areas between the deflection rolls and the drying cylinders, is sandwiched between the second transport belt


33


′ and the second metallic screen


13


′ so that no free stretches occur.




Over a suitable leading roll


65


, the second transport belt


33


′ is taken from the peripheral area


63


of the drying cylinder


57


, while the web


3


and the metal screen


13


continue to lie on its peripheral surface. In the area of a nip


67


, which is opening, in which the second metal screen


13


′ and the web


3


are lifted from the peripheral surface


63


of drying cylinder


57


, a transport band


33


″ of a subsequent drying group


69


is fed onto drying cylinder


57


. At this point, the web


3


is securely sandwiched between the second metal screen


13


′ and the transport band


33


″, all of which are guided onto a fourth deflection roll


71


of the third drying group


69


. Since the web


3


in the area of the fourth deflection roll


71


, as well as in the area of the second deflection roll


47


, is arranged externally of the respective deflection rolls and transport bands or belts, and therefore completely exposed to the centrifugal forces, these deflection rolls are preferably provided with suction device. Thus, for example, the web


3


, by a vacuum on the peripheral area of the deflection rolls, is suctioned onto and guided securely by the deflection rolls, and web tears are avoided.




It becomes apparent from the description for

FIG. 1

, that the drying cylinder


25


of the first drying group


23


and the second press roll


11


of the press section


5


are arranged within the closed loop of the first metal screen


13


. Within the loop of the second metal screen


13


′ lie, as noted, the drying cylinders


55


and


57


of the second drying group


53


. It is in this point that the embodiment depicted in

FIG. 2

of a machine


1


for the manufacturing of a web


3


is different. Corresponding parts are assigned corresponding reference numbers; in this respect, one can refer to the description for FIG.


1


.




The embodiment depicted in

FIG. 2

distinguishes itself in that individual metal screens


13


,


13


′, and


13


″ are respectively assigned to the second press roll


11


of the press section


5


, the drying cylinder


25


of the first drying group


23


, and the drying cylinder


55


of the second drying group


53


′. It can be seen that in this case the drying group


53


′ is comprised here of only one drying cylinder


55


, which, as with drying cylinder


25


, is assigned its own transport belt


33


′ or a drying screen or drying felt. The first deflection roll


31


between the press section


5


and the first drying group


23


is provided with suction, as is the second deflection roll


47


between both drying groups


23


and


53


′. Thus, the web


3


, which lies externally of the first and second deflection rolls and the transport bands or belts, is held by a vacuum to the peripheral area of the respective deflection roll, and thereby stabilized. Correspondingly, the third deflection roll


59


, which, as observed in machine run direction, is arranged behind the drying cylinder


55


, is also designed with a suctioning capability in order to stabilize the circulating web


3


, which is guided onto a drying cylinder within the successive drying group


69


not depicted here.




In view of the above and in view of

FIG. 2

, the metal screen


13


guides the web


3


. Only one press roll


11


is within the metal screen


13


. A press felt


18


guides the web


3


which is between and contacting the metal screen


13


and the press felt


18


in at least one location.




The special guidance of the metal screens


13


,


13


′, and


13


″ depicted in

FIG. 2

, which includes only one press roll or one drying cylinder within each closed screen loop, creates an especially uncomplicated screen guiding that enables high machine running speeds.




In the free transitional areas, in which the web


3


does not lie on the surface of a roll or a cylinder, it is guided, in sandwich fashion, between a metal screen and a transport belt. Thus, during the transfer from press section


5


and the first drying group


23


, the web


3


runs between the web guide roll


29


and the first deflection roll


31


, sandwiched between the first transport belt


33


and the first metallic screen


13


. Between the deflection roll


31


and the drying cylinder


25


, the web


3


is guided between the first transport belt


33


and the second metal screen


13


′. A guidance of the web


3


between the drying cylinder


25


and the successive second deflection roll


47


proceeds by means of belts that run in the same direction, specifically through the second metal screen


13


′ and through the second transport belt


33


′. From the second deflection roll


47


the web


3


is carried between the transport belt


33


′ and the third metallic screen


13


″ onto the drying cylinder


55


.




In view of the above and in view of

FIG. 2

, the web


3


is transferred from the first metallic screen


13


to drying cylinder screen


13


′ in a closed draw. The web


3


is supported by the first metallic screen


13


, a transport belt


33


, and one of the drying cylinder screens


13


′ in the closed draw. The web


3


is sandwiched between the first metallic screen


13


and the transport belt


33


in the closed draw.




It is clear from this that certain rolls of machine


1


as depicted in

FIG. 2

, specifically the second press roll


11


and the drying cylinders depicted as drying cylinders


25


and


55


, are each assigned their own metal screens, respectively


13


,


13


′, and


13


″, each of which is guided in a closed loop. In addition, guide rolls are, by a known method, inserted, which on one hand provides guidance of, and on the other hand provides tension to, the metal screen, which will not be discussed any further. Correspondingly, the transport belts


33


and


33


′, each of which are assigned to a single drying cylinder


25


or


55


, are guided in a closed loop, within which lie the deflection rolls and some of the guide rolls, so that it is ensured that no free stretches develop, within which the web can be guided between two rolls without any support.




From the descriptions for

FIGS. 1 and 2

it becomes clear that, in the area of press section


5


as well as in the area of drying section


21


, metal screens can be inserted, which provide the desired guiding of the web.




Within press section


5


, the first metal screen


13


, which serves as a transport belt, ensures that the web


3


does not follow the press felt, which is guided together with web


3


between the first press roll


9


and the additional press


15


, or between the second press roll


11


and the additional roll


17


. The web


3


runs on the point of separation of the web and press felt with the metallic screen, which prevents the web from running with the press felt. Through this special guiding of the web, re-moistening of the web is reduced. The running of the web with the metal screen is based on the fact that rear ventilation on the press felt is greater than on the side of the metal screen.




From

FIGS. 1 and 2

it is evident that the first metal screen


13


can also be used as a transport belt between the press section


5


and the drying section


21


. This enables a web guidance free of stretches, through which the transverse profile of the mechanical web qualities are improved.





FIGS. 1 and 2

easily demonstrate that the metal screen can be used especially well in a drying section


21


of a machine


1


for manufacturing a continuous web


3


, since in the areas where an adhesion of the web to the surface of a roll may occur, for example to a drying cylinder, a metallic screen lifts the web from the peripheral area of the drying cylinder and subjugates it to restricted guidance, so that adhesions are eliminated. Through the restricted guidance of the web with the aid of a metallic screen, a jamming-up of rolls within a machine for manufacturing a web can be safely avoided. In many cases the number of scrapers inside the drying sections, which serve to remove the web and clean the surface, can be reduced.




In every case, the metallic screen is preferably of a very thin design. The thickness lies in a range of under 1 mm. Preferred metallic screens have a thickness of approximately 0.1 mm. Screens have been employed, however, that were only 0.08 mm thick. Such thin metallic screens present almost no hindrance to the heat transfer from drying cylinders to the web. The metallic screens can be designed to be porous, so that they do not hinder evaporation from the web. Due to the porosity of the metal screen, an application directly in the area of the peripheral area


10


of the second press roll is also possible.




The preferred surface of the metallic screen is very finely structured, so that a marking of the web is avoided. A certain microstructure on the surface of the metallic screen is advantageous in that frictional engagement between the metal screen and the web can be achieved, in which, especially in the sandwich guidance, that is, while guiding the web between two belts running at equal speeds, the transverse shrinkage of the web is effectively reduced.




Finally, it is also possible to heat the metallic screen, preferably immediately before picking up on the web, in order to ensure a defined temperature gradient, especially in the drying section


21


. In

FIGS. 1 and 2

, a heater H is shown merely for example.




On the whole it becomes clear that the web is guided between the metal screen and the surface of individual rolls in order to ensure a defined course of the web. This is advantageous in the press section to remove the web from a press felt and to forward it in a defined direction, without the use of additional suction devices. These guiding characteristics can be achieved through specific settings of the felt porosity and the metal screen.




Further, due to the metal belt, which was removed and was under tension from the peripheral surface of a roll, for example from the surface of a drying cylinder, it can be ensured that the web does not adhere to, and jam, the drying cylinder.




Because of these conditions, i.e. the directed guidance of the web within the machine


1


, very high machine running speeds can be reached without reducing machine operational security.




Conventional cleaning devices C can be provided for the metal screen, so that no adhesions arise on the surface of the metal screen that could have an adverse effect on the surface of the web.




The advantages of the metal screen can be achieved regardless of whether the screen is made completely of metal or whether a conventional drying screen is metallized, or whether a screen with metal and synthetic threads is used as a metal screen.




The advantages of a metallic screen can be employed with a machine for manufacturing a continuous web, especially in that a metal screen is assigned to each roll on which the adhesion tendency of the web is especially great. It is therefore unnecessary to assign such a metal screen to each roll of a machine for manufacturing a continuous web. It is, however, also possible, if desired, to equip suction rolls or other rolls of a machine for manufacturing a web with metal screens.




It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the invention has been described with reference to a preferred embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the invention in its aspects. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein; rather, the invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.



Claims
  • 1. A web machine system, comprising:a web; a first closed screen loop which guides the web; only one press roll within the first closed screen loop; a press felt which guides the web; the web being between and contacting the first closed screen loop and the press felt in at least one location; a plurality of drying cylinders for guiding the web in a path; and each of the plurality of drying cylinders has its own drying cylinder screen comprising metal for guiding the web in the path, and each of the plurality of drying cylinders is within a closed loop of its own drying cylinder screen.
  • 2. The web machine system of claim 1, further comprising a plurality of rolls for guiding the web prior to the plurality of the drying cylinders.
  • 3. The web machine system of claim 2, wherein the plurality of rolls comprise the one press roll, and wherein the web is guided through a press nip formed between a cooperating roll and the one press roll.
  • 4. The web machine system of claim 3, wherein the first closed screen loop comprises an additional metal screen which is guided with the web through the press nip.
  • 5. The web machine system of claim 4, further comprising a heater positioned adjacent to the additional metal screen, the heater being located before a web contact point of the additional metal screen.
  • 6. The web machine system of claim 2, wherein the plurality of rolls comprise the one press roll, and wherein the plurality of rolls form two press nips through which the web is guided.
  • 7. The web machine system of claim 1, wherein each screen comprises a microstructure for providing a frictional engagement between the screen and the web.
  • 8. The web machine system of claim 1, wherein each screen is porous.
  • 9. The web machine system of claim 1, further comprising at least one cleaning device for at least one of the screens.
  • 10. The web machine system of claim 1, wherein at least one of the screens has a thickness of less than about 1 mm.
  • 11. The web machine system of claim 1, wherein at least one of the screens has a thickness of less than about 0.1 mm.
  • 12. The web machine system of claim 1, wherein the web comprises one of paper and cardboard.
  • 13. The web machine system of claim 1, wherein at least one of the screens consists essentially of metal.
  • 14. The web machine system of claim 1, wherein the web is transferred from the first closed screen loop to one of the drying cylinder screens in a closed draw.
  • 15. The web machine system of claim 14, wherein the web is supported by the metal screen, a transport belt, and one of the drying cylinder screens in the closed draw.
  • 16. The web machine system of claim 14, wherein the web is sandwiched between the metal screen and a transport belt in the closed draw.
  • 17. A web machine system, comprising:a web; a plurality of drying cylinders for guiding the web in a path; each of the plurality of drying cylinders has its own drying cylinder screen comprising metal for guiding the web in the path, and each of the plurality of drying cylinders is within a closed loop of its own screen; a plurality of rolls for guiding the web prior to the plurality of the drying cylinders, the plurality of rolls comprising at least one press roll, and the web being guided through at least one press nip formed between at least one cooperating roll and the at least one press roll; an additional screen which is guided with the web through the at least one press nip; the web being transferred from the additional screen to one of the drying cylinder screens in a closed draw.
  • 18. The web machine system of claim 17, wherein the additional screen comprises a metal screen which is guided with the web through the at least one press nip.
  • 19. The web machine system of claim 17, wherein at least one of the screens has a thickness of less than about 1 mm.
  • 20. The web machine system of claim 17, wherein at least one of the screens has a thickness of less than about 0.1 mm.
  • 21. A web machine system for manufacturing a web, comprising:a first closed loop which guides the web; only one press roll within the first closed loop; a press nip formed between the one press roll and another roll; the web being guided through the press nip between a press felt and the first closed loop; a plurality of drying cylinders arranged downstream from the press nip in a web travel direction; and each of the plurality of drying cylinders having its own drying cylinder screen comprising metal; each of the plurality of drying cylinders being within a closed loop of its own drying cylinder screen; a first transfer belt; and a first deflection roll, wherein the first transfer belt is guided around the first deflection roll with the web so as to transfer the web from the first closed screen loop to one of the drying cylinder screens.
Priority Claims (1)
Number Date Country Kind
196 54 434 Dec 1996 DE
CROSS-REFERENCE OR RELATED APPLICATIONS

The present application is a continuation application of U.S. application Ser. No. 08/998,593, filed Dec. 22, 1997, now U.S. Pat. No. 6,346,171, the disclosure of which is expressly incorporated by reference herein in its entirety. The present application claims the priority under 35 U.S.C. §119 of German Patent Application No. 196 54 434.3 filed on Dec. 30, 1996, the disclosure of which is expressly incorporated by reference herein in its entirety.

US Referenced Citations (15)
Number Name Date Kind
1470675 Armsttrong Oct 1923 A
1925917 Chalon Sep 1933 A
2134293 Webb Oct 1938 A
2437254 Hill Mar 1948 A
2918094 Freynik Dec 1959 A
4000035 Schiel et al. Dec 1976 A
4251928 Rotar et al. Feb 1981 A
4874469 Pulkowski Oct 1989 A
5178732 Steiner et al. Jan 1993 A
5388347 Kerttula et al. Feb 1995 A
5389205 Pajula et al. Feb 1995 A
5611892 Karvinen et al. Mar 1997 A
5820731 Söderholm Oct 1998 A
5830323 Grimm Nov 1998 A
5876565 Laapotti Mar 1999 A
Foreign Referenced Citations (7)
Number Date Country
560748 Oct 1932 DE
642993 Mar 1937 DE
6936412 Sep 1969 DE
54206 Jun 1982 EP
1377 Jan 1906 GB
186793 Dec 1963 SE
436120 Jul 1974 SU
Continuations (1)
Number Date Country
Parent 08/998593 Dec 1997 US
Child 09/976075 US