摘要:
A processing device and method applying the same for processing a coated or uncoated fibrous web is provided. The device comprises a belt configured to extend around a guiding element, at least one counter-element being disposed outside said belt to provide a contact area with the belt, such that the belt and the counter-element establish therebetween a web processing zone for passing a web to be processed therethrough. The processing zone length is defined by the disposition of the belt's guiding element and/or by the configuration of the counter-elements. The contact pressure applied to a web in the processing zone is within the range of between about 0.01 MPa and about 200 MPa.
摘要:
A method for manufacturing a calendar roll in which a continuous band of filler material is wound onto an axle until a desired diameter for the roll is obtained, and then an elastic coating is applied to an outermost surface of the band, i.e., the outermost layer of windings. An adhesive agent may be applied onto the band such that adjacent windings of the band adhere to one another during winding of the band onto the axle. Adjacent windings of the band in an uppermost layer of windings may be welded together to provide a foundation for the elastic coating. The calender roll includes an axle, a uniform and continuous band of filler material wound onto the axle to provide the roll with a desired diameter, and an elastic polymer coating arranged on an outermost layer of windings of the band on the axle.
摘要:
A method and arrangement for computing and regulating distribution of linear load in a multi-nip calender. A material web is passed through the nips in a set of rolls including a variable-crown upper roll, a variable-crown lower roll and intermediate rolls positioned between the upper and lower rolls. The rolls in the set of rolls are supported so that, when the nips are closed, the bending lines of the rolls are curved downwards. When computing and regulating the linear loads, one or more of the physical properties affecting the bending of each intermediate roll under load, such as bending rigidity, mass, shape, and material properties, are taken into account. The ratio of the linear loads applied to the intermediate rolls, the weight of the rolls per se, and/or the support forces applied to the rolls are regulated so that the set of rolls is in a state of equilibrium and a predetermined state of deflection.
摘要:
A processing device and a method applying the same for processing a coated or uncoated fibrous web is provided. The device comprises a belt configured to extend around a guiding element, at least one counter-element being disposed outside said belt to provide a contact area with the belt, such that the belt and the counter-element establish therebetween a web processing zone for passing a web to be processed therethrough. The processing zone length is defined by the disposition of the belt's guiding element and/or by the design of the counter-elements. A contact pressure applied to a web in the processing zone is configured to be within the range of between about 0.01 MPa and about 70 MPa.
摘要:
An arrangement in a calender for guiding a paper web (W) from one nip (N) to another nip and for doctoring a calender roll (1, 2) has a doctor (4) supported by a web (W) guide means (5). The doctor (4) includes at least one stationary and convex guide surface (51) which receives the web from one nip (N) of the calender and over and on which the web is guided towards the other nip of the calender, so that between the guide surface and the web there is a medium layer which carries the web.
摘要:
A processing device and method applying the same for processing a coated or uncoated fibrous web is provided. The device comprises a belt configured to extend around a guiding element, at least one counter-element being disposed outside said belt to provide a contact area with the belt, such that the belt and the counter-element establish therebetween a web processing zone for passing a web to be processed therethrough. The processing zone length is defined by the disposition of the belt's guiding element and/or by the configuration of the counter-elements. The contact pressure applied to a web in the processing zone is within the range of between about 0.01 MPa and about 200 MPa.
摘要:
A processing device and a method of applying the same for processing a coated or uncoated fibrous web are provided. The device comprises a belt configured to extend around a guiding element, at least one counter-element being disposed outside said belt to establish a contact area with the belt, such that the belt and the counter-element establish therebetween a web processing zone for passing a web to be processed therethrough. The processing zone length is defined by the disposition/adjustment of the belt's guiding element and/or by the design of the counter-elements. The contact pressure applied to a web in the processing zone is configured to be within the range of between about 0.01 MPa and about 70 MPa.
摘要:
A roll end (30) for a roll, in particular for a heatable roll, in a paper or board machine or in a finishing machine is made by a powder metallurgy process in a mold (20) such that a duct system (10) for a heat transfer medium is formed in connection with the manufacture of the roll end. A hot isostatic pressing process in particular is used in the manufacture.
摘要:
A method for modernizing a existing multiroll calender, having at least one stack of calender rolls (10, 20), each stack comprising at least two calender rolls (11, 12, 13, 14, 21, 22, 23, 24) and at least one of the calender rolls being a smooth-surfaced press-roll (12, 22). In an existing multiroll calender the smooth-surfaced press roll (12, 22) is replaced by an ultra thermo roll that is a thermo roll with a diameter substantially the same or less than the thermo roll to be replaced, so that the surface temperature of the ultra thermo roll when heated is at least 110° C., and has at least 10° C. higher than the surface temperature of the existing roll with the same heating fluid temperature and having flow channels arranged in such a way that vibration excitation is minimized, by being arranged to form a spiral geometry in the mantle.
摘要:
A paper or board mill includes a drying section, which includes at least one drying cylinder group and at least one impingement drying unit (PK). The method uses a turbine engine (10), the combustion gases (G1) of which are conducted at least into the impingement drying unit (PK) as impingement air.