JP2516180C - - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a press apparatus for pressing a formed web. In particular, the invention relates to a press device having a wide nip press. BACKGROUND ART A TRI-NIP or Tri-Vent press, followed by a fourth smoothing press, produces newsprint paper and also produces high quality paper with improved paper uniformity. Such uniformity is achieved by first pressing one side of the web directly against the press rolls, and then, during the movement of the web, through the smoothing press as the fourth press in the aforementioned TRI-NIP configuration. Achieved by smoothing the other side. TRI-NIP is a registered trademark of Beloit, and Tri-Vent is a mark on the Beloit common law. Drying of webs made with the foregoing apparatus is 3126 meters per minute (4,000 feet per minute) and is in the range of 30-43% solids. Wide nip presses are generally more expensive than presses containing ordinary roll pairs, but are not necessarily expensive given the cost of some spare rolls and the accessories for the TRI-NIP press described above. Absent. Thus, the cost of a wide nip press is comparable to a press involving a normal roll pair, and furthermore, 48-52
The effect is that sheets between the% solids are produced at a speed of 3126 meters per minute (4,000 feet per minute). In particular, TRI-NIP presses or Tri-Vent presses plus a fourth press are relatively expensive and require extra labor to replace the felt. The present invention has the following effects. First, the number of press nips and the number of press frames are small. Second, by reducing the closing requirement, ie, the number of required press felts, the time during which the press can be idle during the felt change is also reduced. Thus, the dryness of the web exiting the press increases according to the configuration of the press device of the present invention. The foregoing objects are attained in the present invention by providing one inverted wide felt nip press at the first press position. Such a wide nip press
(ENP) cooperates with the transfer felt and the web rides on the bottom felt as it passes through a single felt roll press at the second press position. The second press increases the drying of the web by only a few percent, but achieves the goal of producing a web with less front and back dihedral. Accordingly, it is a primary object of the present invention to provide a press apparatus that enhances web drying while enhancing sheet uniformity. Other objects and advantages of the present invention will become readily apparent from the detailed description set forth below in connection with the accompanying drawings. DISCLOSURE OF THE INVENTION The present invention relates to a press apparatus for pressing a formed paper web. The apparatus has a wide nip press that presses moisture from the formed web. A press roll is located downstream of the wide nip press, and the press roll and one roll cooperate to form a pair of rolls between them that further presses the web, so that they are substantially even on both sides of the web. Surface characteristics. In the apparatus of the present invention, the wide nip press has a support roll, which has a smooth peripheral surface such that the web travels around the support roll and one side of the web directly contacts the smooth surface. Configure. The wide press member cooperates with its smooth surface to define a wide press between them and pass the web therethrough. Further, the web is positioned between the blanket and the support roll while the support blanket cooperates slidably with the press member and moves through the press section. In the apparatus of the present invention, the support roll is disposed below the wide press unit so as to facilitate removal of the waste sheet. In the apparatus of the present invention, the widened press portion is a widened shoe that defines a concave surface cooperating with the smooth peripheral surface of the support roll and forms a press portion therebetween. In one embodiment of the present invention, the wide press section is a fluid pressure shoe. The press roll constitutes another smooth peripheral surface, the smooth surface being in direct contact with the opposite side of the web to one side contacting said smooth surface and substantially on both sides of the web. Are provided with uniform surface properties. In addition, the pressing device has a pick-up roll located in close proximity to the formed web for picking up the web. A press felt is arranged between the web and the pick-up roll, and the press felt runs around the pick-up roll so that the web is picked up on the press felt. A steam box is located immediately downstream of the press felt and downstream of the pickup roll. The steam box is connected to a source of pressurized steam so that the steam is applied directly to the web supported by the press felt. Vacuum means are located immediately adjacent to the steam box, such that the press felt and web are located between the steam box and the vacuum means. The press felt is disposed between the web and the vacuum means, which draws steam through the web and the press felt. The wide nip press is located downstream of the vacuum means. In particular, since the support blanket cooperates with the press member in a sliding manner, the press felt and the web are separated by the support blanket, the press felt, and the support blanket and the support roll while the web continuously moves through the press section. Placed between. The pressing device also has a suction roll arranged downstream of the press section such that the web is guided from the press section in an open draw (unsupported) around the suction roll to that roll. Another felt runs around the suction roll such that it is located between the web and the suction roll. Another steam box cooperates with the suction roll and the other steam box is connected to a source of pressurized steam, so that the pressurized steam is applied directly to the pressed web. Excess steam is drawn through another felt and a suction roll. A transfer felt is positioned downstream of the suction roll for transferring the web from another felt to the transfer felt. In the immediate vicinity of the other felt a suction guide roll is arranged. The transfer felt is arranged around a suction guide roll such that the web is located between another felt and the transfer felt. The web is transferred from another felt to a transfer felt when the suction guide roll is connected to a partial vacuum source. The press roll is arranged downstream of the suction guide roll, and the roll cooperating with the press roll is a vented roll. Many modifications of the present invention will be readily apparent to one skilled in the art from the following detailed description, taken in conjunction with the accompanying drawings. However, such modifications are included within the spirit and scope of the invention as defined by the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of one embodiment of the present invention, showing a wide type hydraulic shoe of a wide nip press. FIG. 2 is a view similar to FIG. 1, but showing another embodiment of the invention in which the wide nip press has a hydraulic shoe. Like numbers refer to like parts throughout the various embodiments of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a side view of a press apparatus indicated by reference numeral 10 as a whole of the present invention for pressing a formed paper web W indicated by a dotted line. Apparatus 10 has a wide nip press for pressing moisture from formed web W, which is indicated generally by the numeral 12. A press roll 14 is arranged downstream of the wide nip press 12. Roll 16 is press roll 14
Cooperate with each other to form a roll pair, generally designated by 18, between the roll pairs.
18 further presses the web W such that substantially uniform surface properties are imparted to both sides 20, 22 of the web W. As shown in FIG. 1, the wide nip press 12 has a support roll 24 that defines a smooth peripheral surface 26 so that the web W runs around the support roll 24 and one side 20 of the web W It comes in direct contact with. The wide press member, generally designated 28, cooperates with the smooth surface 26 to form a wide press portion 30 therebetween to permit web W to pass therethrough. The support blanket 32 slideably cooperates with the press member 28 so that the web W is disposed between the blanket 32 and the support roll 24 while the blanket and the web W pass through the press section 30. As shown in FIG. 1, the support roll 24 is located below the wide press member 28 to facilitate the removal of waste paper. The wide pressing member 28 is a wide shoe forming a concave surface 36, and the concave surface 36 cooperates with the smooth peripheral surface 26 so as to form the press portion 30 therebetween. FIG. 2 is a side view of another embodiment of the present invention, wherein
A is a fluid pressure shoe 34A. Otherwise, the embodiment of FIG. 2 is the same as the embodiment of FIG. FIG. 1 shows the press roll 14 comprising another smooth peripheral surface 38. The other smooth peripheral surface 38 is in direct contact with the opposite side 22 of the web W, thereby providing substantially uniform surface characteristics on both sides 20,22 of the web W. The press device 10 also forms the web W to pick up the web W.
, A pickup roll 40, such as a suction pickup roll, for example. The press felt 42 is disposed between the web W and the pickup roll 40, and runs around the pickup roll 40 so that the web W is transmitted to the press felt 42. The steam box 44 is in the immediate vicinity of the press felt 42 and the pickup roll 40
Is located downstream of The steam box 44 is connected to a pressurized steam source 46 so that the steam is directly applied to the web W supported by the press felt 42. Vacuum means 48 is located immediately adjacent to steam box 44 such that press felt 42 and web W are located between steam box 44 and vacuum means 48. The press felt 42 is disposed between the web W and the vacuum means 48. Vacuum means 48 draws steam through web W and press felt 42. The wide nip press 12 is located downstream of the vacuum means 48. While the support blanket 32, the press felt 42, and the web W continuously move through the press unit 30, the support blanket 32 and the web W move between the support blanket 32 and the support roll 24. Press member 28 to be placed on
And cooperate slidably. As shown in FIG. 1, the press device 10 further has a suction roll 50 disposed downstream of the press unit 30, so that the web W is supplied from the press unit 30 to the open draw 52.
Is guided around the suction roll 50. Another felt 54 travels around the suction roll 50 so as to be disposed between the web W and the suction roll 50. Another steam box 56 cooperates with the suction roll 50. The steam box 56 is connected to a pressurized steam source 46 so that pressurized steam is directly applied to the pressed web W. Extra steam is drawn through another felt 54 and through a suction roll 50. A transfer felt 58 is arranged downstream of the suction roll 50 for transferring the web W from another felt 54 to the transfer felt 58. A suction guide roll 60 is located immediately adjacent to another felt 54. The transfer felt 58 runs around the suction guide roll 60 so that the web W is disposed between the other felt 54 and the transfer felt 58. When the suction guide roll 60 is connected to a partial vacuum source, the web W is transferred from another felt 54 to a transfer felt 58. The press roll 14 is arranged downstream of the suction guide roll 60. Further, the roll 16 cooperating with the press roll 14 is a roll with a vent such as a roll with a groove, a roll with a blind drill hole, or a suction roll. In operation of the press apparatus of the present invention, the web is transferred by a pick-up roll from a forming wire located downstream of the press felt. The web is steamed to increase the amount of water removed during the next wide nip press. The web heated by the steam travels through the press section, is separated from the smooth surface of the support roll 24, and is guided by the open draw 52. Then the web is again heated with steam and transferred to another felt. Then, the opposite side 22 of the web comes into direct contact with another smooth surface of the press roll 14, so that both sides of the web can obtain uniform surface characteristics. The present invention provides a press apparatus that not only increases the amount of water removed from the web, but also enhances the symmetry of the web.

Claims (1)

Claims: 1. A paper web (W) is disposed in close proximity to a formed paper web (W), and the paper web (W) is
A pickup roll (40) to be backed up; disposed between the paper web (W) and the pickup roll (40), and the paper web (W)
Press fel running around the pickup roll (40) to be transported
Preparative (42) and; extended nip press (12) for pressing water from the formed paper web (W) and has; the extended nip press (12); the paper web (W) travels around, A support roll (24) forming a smooth surface (26) such that one side (20) of the paper web (W) is in direct contact with the paper web (W); and a support roll (24) disposed above the support roll (24). 26) and in cooperation have a concave (36) for forming wide press section (30) therebetween, wherein a the wide shoe (28 to allow the paper web (W) is passed), the press A support blanket (32) slidably cooperating with the section (30),
While holding the paper web (W) through the press section (30), the holding blanket (32)
Position the paper web (W) between the support blanket (32) and the support roll (24).
; Wherein the support rolls (24) are disposed below the wide press section to facilitate the removal of waste paper (28), a press apparatus for pressing a paper web, said Puresufu
The belt (42) is between the support blanket (32) and the paper web passing through the press section (30).
Be a single felt disposed; said press apparatus further comprises: disposed downstream of the pick-up roll (40) adjacent said press felt (42)
The steam is transferred directly to the paper web (W) supported by the press felt (42).
A steam box (44) connected to a pressurized steam source (46) so that the press felt (42) and the paper web (W) can be brought into contact with the steam box (44) and a vacuum hand;
Placed in close proximity to the steam box (44) so that it is located between the step (48)
A has been vacuum means (48), said press felt (42) is arranged between the paper web (W) wherein the vacuum means (48), the paper web (W) and said press felt (42) Through
Vacuum means (48) for drawing the steam through; wide nip press (12) is disposed downstream of the vacuum means (48); and downstream of the wide nip press (12). A press roll (14); disposed below the press roll (14), cooperating with the press roll (14) to form a pair of rolls (18) therebetween, and both sides of the paper web (W). (20,22) having a vented roll (16) that imparts substantially uniform surface properties; said press roll (14) comprises another smooth peripheral surface (38); The other smooth surface (38) gives the paper web (W) even surface properties.
A pressing device (10) for pressing a formed paper web (W), which is in direct surface contact with the opposite side (22) of the paper web (W). 2. A press apparatus as set forth in claim 1, wherein the wide press member (28A) is a hydraulic shoe (34A) (10). 3. The press section, wherein the paper web (W) is configured to be guided from the press section (30) to the suction roll (50) in an unsupported state (52) and around the suction roll (50).
A suction roll (50) disposed downstream of the suction roll (50); and a suction roll (50) disposed between the paper web (W) and the suction (50).
) And another steam box (56) cooperating with the suction roll (50), and pressurized steam is applied to the pressed paper web (W). Another steam box (46) connected to the pressurized steam source (46) so that it can be directly applied, and the extra steam passes through the other felt (54) and is drawn through the suction roll (50). and 56), runs through the roll pair, the disposed downstream of the suction roll (50), the transfer felt for transferring the paper c <br/> Ebb (W) from the other felt (54) ( 58), the paper web (W) is disposed adjacent to the other felt (54), and the paper web (W) is disposed between the another felt (54) and the transfer felt (58). Suction guide roll (60) around which transfer felt (58) runs There, when the suction guide roll (60) is connected to a partial vacuum source, suction the paper web (W) is arranged to transport the to the transfer felt from another felt (54) (58) The press device (10) according to claim 1 , comprising: a guide roll (60). And wherein the suction roll paper web (w) is disposed downstream of the press section (30) as guided by the unsupported state (52) from the press section (30) (50), Another felt (54) running around the suction roll (50) so as to be disposed between the paper web (W) and the suction roll (50), and the suction roll (50) together. Another working steam box (56) connected to the pressurized steam source so that the pressurized steam is applied directly to the pressed paper web (W), and the extra steam is added to the other felt box. (54) and another steam box (56) withdrawn through the suction roll (50), and disposed downstream of the suction roll (50) and from the other felt (54).
A transfer felt (58) for transferring the paper web (W), and a suction guide roll (60) arranged close to the other felt (54)
Then, the paper web (W) is connected to the another felt (54) and the transfer felt (58).
The transfer felt (58) is positioned between the suction guide roll (60) and the transfer felt (58).
), And when the suction guide roll (60) is connected to a partial vacuum source, the paper web (W) is transferred from the other felt (54) to the transfer felt (58). And a suction guide roll (60) disposed , wherein the press roll (14) is disposed downstream with respect to the suction guide roll (60).
The press device (10) according to claim 1, characterized in that: