JP2755484B2 - Sliding shoe device for press of moving web - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a press or surface finishing device for a moving web, in which a cylindrical roll is supported by a shoe having a deformable convex profile on the surface of the roll and the press area. The length of the press area is configured to be variable by forming the press area between the sliding belt and the lubricating means for forming a lubricating film between the sliding level and the shoe. Equipment

2. Description of the Related Art As a prior art, a press device of International Application PCT / SE92 / 00041 is known. According to this device, a shoe is pressurized through a sliding belt between a press roll and a counter roll, and the shoe is pressed. Has a concave shape that follows the press roll contour on the press roll side and the non-concave contour on the counter roll side, and the shoe is adjusted around the central axis of the press roll, so that the contact area with the press roll is adjusted. Is configured to be able to change the pressure distribution. However, the pressure area on the counter roll side cannot be adjusted at all.

Further, as a prior art, there is known the pressing device of U.S. Pat. No. 4,287,021, in which a non-adjustable concave shoe is used to form a press area with a press roll.

Further, a general prior art is disclosed in European Patent Publication No.
No. 0389458 A2.

Description of the Invention One of the main objects of the present invention is that, in the above-described general press device, the width of the press area in the contact area with the press roll is always adjusted by adjusting the convex surface of the shoe along the press surface. An object of the present invention is to provide a press device that can be set to a desired length. The width is a function of the radius of the shoe contact area, and can be changed by changing the degree of convexity of the shoe. By appropriately turning the shoe according to the invention, the contour and width of the press area can be adjusted to achieve the desired. Alternatively, the desired profile allows a removable insert to be inserted into the press area of the shoe. In practice, the width of the press area can be varied in the range of about 1 to 26 cm when using relatively stiff rolls, and in the larger range for softer rolls. . The present invention can be suitably used not only for a press operation for removing moisture from a web but also for a paper smoothing operation for improving the surface finish of the web. When applied to the latter, where the press roll is often heated to improve the web surface, in a preferred embodiment of the present invention, the counter roll located on the opposite side of the shoe to the press roll Is configured to remove heat from the system via a concave pressurized area between the shoe and the counter roll.

BRIEF DESCRIPTION OF THE DRAWINGS Next, the present invention will be described below with reference to the accompanying drawings showing its outline. In the drawings, FIG. 1 is an end view showing a part of an adjustment shoe according to the present invention in cross section, FIG. 2 is an end view showing a partial cross section of another embodiment according to the present invention, FIG. 4 is a partial cross-sectional end view showing an insert in a shoe.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, the same reference numerals indicate the same or similar parts.

FIG. 1 and FIG. 2 show a pressing device for a moving web formed between a cylindrical press roll 4 and a sliding belt 6. The sliding belt is at least partially and slidably supported on a shoe 8 with a variable convex surface contour forming a pressure area. A supply mechanism 10 supplies a lubricant for the lubricating film to a conduit 12 between the sliding belt 6 and the shoe 8.
Is configured to be supplied.

In FIG. 1, a shoe 8 is supported on a counter roll 14, which has a concave profile in the support area, which engages the counter roll via a sliding belt 6, and furthermore has a central axis of the counter roll. It is configured to be press-contacted with the press roll 4 at a desired cross section on the opposite shoe by being adjustably rotated therearound. Adjustment of the shoe is illustratively illustrated by arrow 52. This adjustment of the shoe can be accomplished by applying a load on the end flange 50, not shown. Adjustment of the shoe allows the width of the pressurized area 26 between the press roll 4 and the shoe 8 to be appropriately optimized. The sliding belt may be configured so that its entire length is supported by a shoe, or alternatively, the press area is supported mainly by the shoe, and the remaining path is guided by rollers, for example. The rollers also prevent lateral movement of the sliding belt and extend it, which belongs to techniques known to those skilled in the art and is therefore not shown here.

In FIG. 2, the counter roll 4 has been replaced by a beam on which the shoe 8 is pivotally mounted. Sliding belt 6
Is guided around the beam via rollers and the like not shown here.

In FIG. 3, the insert 15 is shown inside the shoe 8 in an area on the concave side of the pressing area 26. The insert is removable and has a curvature that matches the desired length of the pressurized area 26 in the contact area. Therefore, the length of the pressurized area can be changed by mounting another insert having a different curvature.

A practical detailed description of this press device according to the present invention will not be given any further, since it is a well-known and routine task for a person skilled in the art belonging to the present invention and is easily understood. .

The present invention relates to, for example, improving the surface structure of a fibrous web such as paper or the printability of paper, or a moving web in a papermaking machine (in this case, the web is made of ordinary felt together with one or two felts receiving moisture. (Introduced into the press zone in a manner).

Claims (5)

(57) [Claims] 1. A press area for accommodating a moving web (w), comprising a cylindrical press roll (4) and a sliding belt (6).
The sliding belt is at least partially and slidably supported via a shoe (8), surrounds the shoe, and has a feed mechanism (10). , 12) to supply lubricant to the lubricating film between the sliding belt and the shoe, and the shoe is supported by a counter roll (14) located on the opposite side of the shoe from the press roll (4). In the pressing device, the side of the shoe (8) facing the press roll (4) has a variable convex profile, whereby a desired pressure distribution is achieved in the press area (26). And press equipment. 2. The profile of the shoe (8) on the counter roll (14) side is concave, with the surface of the counter roll in the contact area, and the shoe (8) is adjustable about the central axis of the counter roll. The press device according to claim 1, wherein the press device is mounted on a press. 3. A press area for accommodating a moving web (w), comprising a cylindrical press roll (4) and a sliding belt (6).
And a pressing device for a moving web formed between the sliding belt and the shoe.
Endlessly and slidably supported via a feeder, a supply mechanism (10, 12) is provided to supply a lubricant to a lubricating film between the sliding belt and the shoe, and the shoe is pressed by a press roll (4) of the shoe. ) Is supported by a beam (28) located on the opposite side from the press roll (4) side of the shoe (8), and has a convex profile that can be varied, and is mounted adjustably. The press area (2
A press device characterized in that the width of 6) is achieved as desired. 4. A press area for accommodating a moving web (w), comprising a cylindrical press roll (4) and a sliding belt (6).
The sliding belt is at least partially and slidably supported via a shoe (8), surrounds the shoe, and has a feed mechanism (10). , 12) to supply lubricant to the lubricating film between the sliding belt and the shoe, the shoe being a counter roll (14) or beam (28) located on the opposite side of the shoe to the press roll (4). ), Wherein the shoe (8) comprises a removable insert (15) having a characteristic profile within the area of the press area (26). 5. The press according to claim 1, wherein the counter roll is a cooling roll.