Abstract: A method and apparatus in a drying section of a paper making machine wherein a so-called single-wire draw is applied and wherein blow boxes (20) are used, which are intended to prevent phenomena that disturb the mutual support contact between the web (W) and the drying wire (12). The blow boxes (20) extend across the entire width of the web (W), and they communicate with members (17, 18, 21, 22) that supply blow air, and they are provided with at least two nozzle slots (13, 14) transverse to the running and longitudinal direction of the web (W) as well as with a carrier face (16) between said nozzle slots. Negative pressure is produced in the space (A-) defined by the carrier face (16) and the drying wire (12) by means of the ejection and prevention effects of the air jets (F.sub.1, F.sub.2) blown through the nozzle slots (13,14). In order to speed the threading of the web (W), in the blow boxes (20) the blow sections (24.sub.k+1. . . 24.sub.

Abstract: The invention concerns a method and a device for threading the end of a web (P) from a jumbo roll (30) or equivalent through the winder along a path determined by the members guiding the web (P). In the method the end of the web (P) is passed from the jumbo roll (30) through the winder as of full width by grasping the end of the web (P) placed on the jumbo roll by means of a fetching and grasping device (11). The web (P) is transferred by means of the fetching and grasping device (11) to a web (P) holding device (13), the web (P) is held by means of the web (P) holding device (13), the web (P) is detached from the fetching and grasping device (11), the web (P) is attached to a threading member (22) carried by a carrier device (12), the web (P) is detached from the web (P) holding device (13), and the web (P) is threaded as a single thickness through the winder, whereat web (P) is unwound from the jumbo roll (30).

Abstract: A creping doctor (2) for creping a soft paper web (3) off a yankee cylinder (1) is described which comprises a supporting beam (4) disposed close to the envelope surface of the yankee cylinder (1) and provided with an internal space, the internal space being divided into a first longitudinal suction chamber (24) and a second longitudinal suction chamber (25). The creping doctor also produces a subatmospheric pressure in the suction chambers (24, 25); a first suction connection (18, 19, 21) connecting the first suction chamber (24) of the supporting beam (4) to an external dust-generating space (7) located between the doctor blade (6) and the soft paper web (3) creped off; and a second suction connection (40, 42, 43) connecting the second suction chamber (25) of the supporting beam (4) with an internal dust-generating space (8) located between the doctor blade (6) and the envelope surface of the yankee cylinder (1).

Abstract: In a device for alternatively one- or double-sided coating of a running paper web the final evening-out of the coating is made in a smoothing nip including a first roll and a counter member. The device includes means for leading the web from below upwards into the smoothing nip. At a considerable distance before the smoothing nip, there is a coating substance applicator including an applicator chamber, where the coating substance is brought into a substantially non-pressurized contact with the running web for adhering thereto and travelling therewith upwards to the smoothing nip. The web moves linearly from the applicator to the smoothing nip.

Abstract: A creping doctor (2) for creping a soft paper web (3) off a yankee cylinder (1) is described which comprises a supporting beam (4) disposed close to the envelope surface of the yankee cylinder (1) and provided with an internal space, the internal space of the supporting beam (4) is divided into a first longitudinal suction chamber (24) and a second longitudinal suction chamber (25). The creping doctor also produces a subatmospheric pressure in the suction chambers (24, 25); a first suction connection (18, 19, 21) connecting the first suction chamber (24) of the supporting beam (4) to an external dust-generating space (7) located between the doctor blade (6) and the soft paper web (3) creped off; and a second suction connection (40, 42, 43) connecting the second suction chamber (25) of the supporting beam (4) with an internal dust-generating space (8) located between the doctor blade (6) and the envelope surface of the yankee cylinder (1).

Abstract: A nozzle arrangement in a blow box of a paper machine, comprising one or several nozzles (22a, 22b) placed in connection with the blow box (20) or pipe, through which nozzles a blowing of air can be applied to a moving member in a paper machine placed in their proximity, such as a wire, drying cylinder, guide roll, felt, or the equivalent. The blow box (20) and its nozzles (20a, 20b) are at a certain operational safety distance (C) from the moving member. In connection with the nozzle slots of the nozzles (22a, 22b) or nozzle, a respective nozzle flap (24a, 24b) pivotable around a respective transverse hinge shaft (P) is hinged. The nozzle flaps (24a, 24b) respectively guide the blowing of air (F.sub.a, F.sub.b) to the desired object and if necessary maintain a required difference in pressure.

Abstract: The present invention concerns a roll used in the manufacture of paper, for example a central roll in a press or a calender roll, with which the web is in direct contact and from which the web is detached. A coating has been formed onto a cylinder mantle of the roll, the coating being partly made of metal and also including a ceramic material. An outer face of the coating is formed of carbide-rich areas and of matrix areas placed between the carbide-rich areas. The present invention also concerns a method for manufacturing such a roll.

Abstract: The invention concerns a filter construction in particular for suction driers. The filter construction comprises a first filter material layer (1) of a ceramic material, which is the first layer in relation to the flowing liquid, and a second filter material layer (2) of a ceramic material, connected with said first layer. The first filter material layer (1) acts as the filtering layer proper, and the second filter material layer (2) acts as a layer that supports the construction. The invention also concerns a method for the formation of the filter construction.

Abstract: Method and apparatus for dispensing coating material on a moving substrate, such as a paper or cardboard web or the surface of a roll or the like, wherein the coating material is introduced into the coating apparatus before a coating nip and applied to the substrate through a slit of the coating apparatus directly onto the surface of the moving substrate. The coating nip and slit of the coating apparatus are formed so that a coating material smoothing member of the coating apparatus is directly supported against the moving substrate in a manner such that the free flow aperture of the slit at the coating nip is confined by the moving substrate and the surface of the smoothing member.

Abstract: Method for pressing and dewatering a paper web, in which a hot-pressing stage is utilized where the wet paper web is pressed in direct contact with a cylinder face that has been heated to a temperature higher than about 100.degree. C. A relatively long pressing time and a relatively low compression pressure are applied in a pre-heating/pre-pressing stage. In this preliminary stage, a surface layer of the cylinder that heats the paper web is heated to a temperature higher than about 100.degree. C. In the immediately following stage, the compression pressure applied to the paper web is lowered so that vaporization of the water present in the paper web is intensified.

Abstract: A multi-cylinder dryer for a paper machine having several drying groups situated one after the other, in which drying cylinders are situated one above the other in stacks, preferably in vertical stacks. In subsequent groups, a web is passed from one drying cylinder onto a next drying cylinder by way of a single-wire draw, so that the drying cylinders in the single-wire draw groups are situated outside the loops of their respective drying a wires. The web is passed as a supported draw from one single-wire group to a subsequent single-wire group by using at least two transfer-suction rolls. A first one of the transfer-suction rolls is situated inside a loop of a drying wire of the preceding single-wire draw group. The second or final transfer-suction roll is situated proximate to the first suction roll and inside a loop of a drying wire of the latter or subsequent single-wire draw group, proximate to a first drying cylinder in this subsequent group.

Abstract: The present invention concerns a blade construction (10) for use in longitudinally cutting (in slicing) material webs, such as various paper and cardboard webs, films and recorder tapes, etc., with said cutter a material web being longitudinally parted into partial webs, the cutter consisting of a blade construction (10) comprising one or several blade pairs (11,12). On the edge (13) of a first blade (11), and similarly on the edge (15) of a second blade (12), has by grinding been produced a micro-rounding, and on the apex of the first blade (11) has been produced a bead (14). The radius (r) applied in micro-rounding is advantageously within 0.5-.mu.m, and the dimension of the bead is advantageously within 0.1-1 mm.

Abstract: Multi-cylinder dryer, has upper cylinder (13,14,15,16) and lower cylinders (10,11,12) over which a paper web (W) to be dried is run in meandering fashion from one cylinder onto the next cylinder The paper web is in direct contact with each drying cylinder within a sector that is larger than 180.degree.. An upper wire (5) and a lower wire (6) are used to press the paper web against faces of the drying cylinders (10,11,12; 13,14,15,16). The wires (6,5) are guided by guide rolls, which are placed in such a way that the paper web (W) is continuously supported by a wire (5,6) as it runs from one cylinder onto the other. The guide roll arrangements consist of fragmentary rolls (21,51), which are supported on suction boxes (20) and/or on blow boxes (50) so that at least two fragmentary rolls (21,51) are supported on each suction box (20)/blow box (50). By means of the suction boxes (20)/blow boxes (50), blowings (S,P) are directed at the drying wire (5,6).

Abstract: A method for attaching a label to an outer surface of a package. The label is printed by a printer onto a label web, the label is separated from the web, and tacked to the wrap of the package. The label printed is introduced onto a suction plate, which is arranged on an end of a pivoted swing arm, with a printed side of the label facing the suction plate so that an rim of the label web extends over a pressure roller. Vacuum is applied to the suction plate in order to hold the label, the label is separated from the label web by a shear device and an adhesive precoat is applied on an unprinted side of the label. The package is moved, and the pivoted swing arm is rotated against the package by an actuator (5) so that one edge of the label is brought into an adhering contact with the outer surface of the package by the line pressure exerted by the pressure roller.

Abstract: This publication describes a short-dwell coater for coating a web with coating mix against a rotating backing roll. The coater comprises a support structure, a feeder means adapted to the front lip for feeding the coating mix into an application zone formed between the backing roll and the support structure, and an actual doctor blade, adapted into the support structure to press against the web, with which blade the excess coating mix passing over form the application zone can be removed. According to the invention, a separate predoctoring blade is adapted at a short distance before the actual doctor blade in the machine direction of the web for smoothing out disturbances in the coating mix flow before the mix proceeds up to the actual doctor blade.

Abstract: Method and device in multi-cylinder dryers of a paper machine, which the dryers comprise two lines of drying cylinders (10,11), in whose connection twin-wire draw is applied, by means of whose drying wire (F1,F2) a closed draw is obtained in the transfer of the paper web (W) from one cylinder line onto the other. In the closed draw, the guide rolls (12/13) of the drying wires (F1/F2) are placed at the proximity of the run of the other wire (F2/F1) on which the drying wire runs from its drying cylinder (11/10) to its guide roll (13/12). For the purpose of ventilation of the pockets (T1,T2) defined by the drying wires (F1,F2) and by the free faces of the drying cylinders (10,11), an air jet or air jets (S1) are blown against the drying wires (F1,F2) within the area in which the drying wire (F1/F2) contacts a portion of the web (W) supported by the other drying wire F2 /F1 which runs over a segment of the circumference of the guide roll (13/12) of the other drying wire F2/F1.

Abstract: A synthetic press roll for use in paper machines includes a cylindrical mantle to which a surface layer is applied, the surface layer comprising a mixture of a first powder of metallic material and a second powder of an inorganic material. The metallic material of the first powder includes copper, bronze, stainless steel, nickel, chromium and/or a titanium alloy. The inorganic material of the second powder comprises quartz, feldspar, Al.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, TiC, SiC, MgO, Si.sub.3 N.sub.4, Cr.sub.2 O.sub.3, WC, NbC, VC, Cr.sub.7 C.sub.3, or other corresponding ceramic material, or mixtures of the same. The surface layer may be produced by thermal spraying, casting, by winding a sintered or rolled band of the mixture around the mantle, or by forming a flexible mat pre-coating in which the desired mixture is bound by a binder, such as PTFE, and by fixing the precoating to the roll mantle by melting it by means of induction or laser heating.

Abstract: Method and arrangement in a machine for the manufacture of paper or board, for heating an outer face of a cylinder or roll which is in direct contact with a web to be pressed thereagainst. The cylinder or roll face is heated from outside inductively by using a magnetic field, and by which a heating effect based on eddy currents is produced in the outer layer of the roll or cylinder. A relatively thin outer layer of an electrically conductive ceramic material is used as the cylinder or roll face, in which the resistive heating effect is concentrated. The depth of penetration of the heating effect in the radial direction of the roll of cylinder to be heated is restricted to a sufficiently low depth by choosing the thickness of the ceramic outer layer and/or the electric frequency of the induction heating.

Abstract: A coater for coating a running paper or carboard web comprises a coating chamber having one side open against the web and means for filling the coating chamber with pressurized coating substance. The coating chamber is limited in the longitudinal direction of the web by a web entrance wall, and opposite thereof, a back wall in the form of a doctor member for forming a coating layer on the web. The distance between the walls is so short that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.3 s, preferably at the most 0.03 s. Coating substance is supplied by means of positive pressure to the coating chamber at a position close to the web entrance wall.

Abstract: A method and an apparatus for severing a perforated web involves clamping the web (4) by two clamping members (6, 7) extending essentially transversely over the web (4) against an anvil (1) placed on the opposite side of the web (4) so as to leave a perforated line (5) of the web aligned between the clamping members (6,7). The clamped web is then tensioned by allowing a tensioning member (2) located between the clamping members (6,7) to expand toward a backing bight (20, 21) formed behind the web (4) thus causing the web (4) to be severed at the perforation (5) with the help of tensile stress.