摘要:
A hydrostatically supported roll includes a stationary crosshead, which extends through a rotatable hollow cylinder to form a surrounding clearance space therewith. Annular sealing elements are radially movable in bores provided in the crosshead to sealingly abut the inner circumference of the hollow cylinder. The sealing elements are arranged in diametrically opposing pairs, i.e., they are offset by 180.degree. in the circumferential direction of the roll at the same longitudinal position along the roll. The entire clearance space surrounding the sealing elements is filled with hydraulic fluid at a predetermined pressure, except for the areas in which the sealing elements are present. The interior chamber of one of the sealing elements in each pair can be filled with hydraulic fluid at a higher pressure than the pressure in the clearance space, while the interior chamber of the other one of the sealing elements of each pair can be filled with a hydraulic fluid under a lower pressure than that in the clearance space. In this manner, the individual forces of the sealing elements in a pair produce a net increased, resultant force in the same direction that acts against the hollow cylinder.
摘要:
A process for producing a smooth and glossy surface on a paper web and a calender arrangement for carrying out the process are disclosed. The calender arrangement comprises two sets of rolls through which the paper web is conducted in succession. Each set of rolls comprises a highly heated hard roll and a soft roll. A cooling device arranged upstream of at least one of the nips formed between the roll sets restricts the amount of heat transfer to the inner layers of the paper web and the attendant, undesirable partial plasticization of the inner layers of the web.
摘要:
A calender arrangement including a first stack of rolls with a first heated hard roll, which, together with a center soft roll, forms a nip. On the other side of the soft roll, another soft roll is arranged, which, together with the soft roll, forms another nip. A second stack of rolls with a soft roll which interacts with a second hard heated roll follows the first stack of rolls. The second hard heated roll contacts the paper web on the side lying opposite the side contacted by the first heated hard roll in the first stack. A further hard roll can also cooperate with the hard roll in the second stack to form a hard nip. The treatment that the paper web undergoes, varies in accordance with the type and sequence of the nips through which it is guided.
摘要:
A jig has two winding rolls in two troughs which surround the winding rolls concentrically and contain treatment liquor, and a squeezing device for a web of material passing from the one to the other winding roll arranged between the winding rolls. The squeezing device is arranged high enough that the web of material runs from the squeezing device downward toward both sides. A partition extends upward between the troughs up to the squeezing device.
摘要:
In a roll arrangement a control device is applied with information concerning the width of the web, and the pressure profile to be applied to the web, and the average pressure to be applied to the web. Control signals are generated provided to support elements which support a rotatable shell of a roll on a fixed beam to create an appropriate nip pressure.
摘要:
The invention concerns a calender which comprises a vertical stack of interlinked rollers driven individually by regulated electric motors. The regulation process acts on the distribution of the delivered power to the individual rollers such that the forces acting on the rollers in the horizontal direction and measured in the roller bearings are minimized, so enabling slimmer rollers to be used.
摘要:
Apparatus for forming an extended nip between a mating roll and a shoe roll for treating a product web, in particular a paper web, the roll axes of which lie in a loading plane E, having a mating roll which is supported via in each case one roll-end assembly on in each case one bearing in a first bracket, having a shoe roll which has stationary bearing journals which are supported in each case via a bearing in in each case one second bracket, one of the brackets being fastened to a stand, and having releasable devices for connecting the brackets to one another, the releasable connecting elements comprising connecting lugs which are guided displaceably in grooves of one of the brackets between a locked position and at least one unlocked position along connecting axes, each connecting lug having a slot which extends parallel to a connecting axis and through which fastening pins which can be inserted in the locked position into one and the other bracket can be inserted and can be brought into engagement with opposite force action faces of the respective slot.
摘要:
A controlled deflection roll having a rotatable roll shell which is penetrated by a stationary shaft, a hydraulic bearing arrangement between shaft and roll shell, which is formed by individual hydrostatic bearing elements arranged axially beside one another, which each comprise a radially movable force element having an outer bearing pocket element, the outer bearing pocket element having a cylindrical outer bearing surface supporting the cylindrical roll shell hydrostatically on an inner shell circumferential line, and having an edge bearing unit provided at each end of the roll shell, the outer bearing pocket element (9) in each case being mounted hydrostatically on a spherical inner bearing surface (13) running concentrically with respect to the inner circumferential line of the roll shell (2).
摘要:
Apparatus for forming an extended nip between a heated mating roll and a shoe roll for treating a product web, especially a paper web, the shoe roll having a stationary support and a flexible belt which can rotate about the support and, in the area of the extended nip, is supported on a shoe which is guided on the support, forms a press section and has an effective shoe width, and the belt having end sections which are fixed to end walls that are rotatably mounted on the support, in each case at the ends and axially adjacent to but at a distance from a mating face located opposite the effective shoe width of the shoe, the mating roll having a radially protruding support ring, which forms an opposing bearing for the direct support of an outer belt section on the mating roll and consists of a thermally insulating material.
摘要:
A roller which can be heated, has a cylindrical roller body which turns about its axis and has a first hollow arrangement and a second hollow arrangement in the form of several channels closed on their ends which run parallel to the axis and which are separated from one another and are of uniform volume. In the first arrangement, an electric radiant heating device is arranged on the roller along its longitudinal direction at least over the working area of the roller. The longitudinal channels of the second hollow arrangement are partly filled with a liquid heated to vaporizing by the heating device.