Voith Patent Gmbh

Michael Straub

Uwe Koeckritz

Robert Eberhardt

Jens Kallenberg

Reinhard Holl

Matthias Hoehsl

Johann Boeck

Cedric Fitzer

Johan Bergvall

Timo Kalefe

Tom Meijer

Matthias Schmitt

Antony Morton

Daniel Gronych

Uwe Köckritz

Johann Böck

Christian Iniotakis

Uwe Köckritz Dr

A method for producing a paper machine clothing includes the following steps: a) providing a film-like substrate having an upper face and a lower face opposite the upper face; b) forming a pattern of holes in the substrate by boring a multiplicity of holes, which connect the upper face to the lower face, into the substrate by way of at least one laser light source. A bore hole strategy is applied which ensures that, in temporal sequence between the forming of a first hole and an immediately adjacent second hole in the pattern of holes, at least one further hole of the pattern of holes is formed in the substrate which is not immediately adjacent either the first hole or the second hole in the pattern of holes.

Method for producing a paper machine clothing

A paper machine clothing has a plurality of through-channels formed in a usable region. The through-channels extend through the substrate to connect the upper and lower sides. The through-channels are non-cylindrical with a cross-sectional area becoming smaller along a thickness direction of the substrate from the upper side to a middle region of the substrate. An upper rim of at least one of the plurality of through-channels directly contacts an upper rim of at least one other neighboring through-channel of the plurality of through-channels, wherein the upper rims of both neighboring through-channels have at least three common local maxima, including two outer common local maxima and one intermediate common local maximum that is located between the two outer common local maxima. There is also described a method of producing such a paper machine clothing.

Paper machine clothing and method of producing the same

A substrate of a paper machine clothing has a usable region formed with through-channels that are non-cylindrical with a cross-sectional area becoming smaller from an upper side to a middle region of the substrate. An upper rim of at least one of the through-channels directly contacts an upper rim of at least one neighboring through-channel and the upper rims have common local maximum. A sectional plane parallel to the thickness direction of the substrate defines an intersecting line with a sidewall of a neighboring through-channel. The intersecting line has a convexly shaped first portion, a concavely shaped second portion, and a third portion that is again convexly shaped going from the at least one common local maximum toward the middle region of the substrate. There is also described a method of producing such a paper machine clothing.

Paper machine clothing and method of producing the paper machine clothing

A paper machine clothing has a substrate with an upper side, a lower side, two lateral edges and a usable region between the two lateral edges. The usable region is formed with a plurality of through-channels extending through the substrate and connecting the upper side with the lower side. The through-channels are non-cylindrical with a cross sectional area becoming smaller when going in a thickness direction of the substrate from the upper side to a middle region of the substrate between the upper side and the lower side, wherein a shape of the cross sectional area of at least one through-channel, preferably of all through-channels, of the plurality of through-channels changes proceeding in the thickness direction of the substrate from the upper side to the lower side.

Clothing is provided for a machine for producing a fibrous web, in particular a paper, board or tissue web. The clothing has a substrate. The substrate has a top side, an underside, two side edges and a useful region between the two side edges. The useful region has a plurality of through-channels, which connect the top side to the underside of the substrate. An inner surface of at least one through-channel, preferably of the majority of all the through-channels, more preferably of all the through-channels in the useful region of the substrate, has a mean roughness depth that is greater than 4 &#x3bc;m, preferably greater than 6 &#x3bc;m, more preferably greater than 8 &#x3bc;m. The clothing of this type is produced using a laser.

Clothing for a machine for producing a fibrous material web

A clothing for a machine for producing a fibrous web, more particularly a paper or cardboard web, is substantially formed from a film-shaped material having a first surface facing the fibrous web and a second surface facing away from the fibrous web. The clothing includes a plurality of through openings each extending along a central axis from the first surface to the second surface. The central axes of at least some of the through openings in the covering enclose an angle with the first surface which differs from 90&#xb0;. A machine for producing a fibrous web, more particularly a paper or cardboard web, includes the clothing. A method for producing the clothing includes making the through openings in the film-shaped material by using a laser.

Clothing for a machine for producing a fibrous web and method for producing a clothing of this type

A paper machine clothing has a substrate with an upper side, a lower side, two lateral edges and a usable region between the two lateral edges. The usable region is formed with a multiplicity of through-channels that extend through the substrate from the upper side to the lower side. The through-channels are non-cylindrical with a cross sectional area becoming smaller when going in a thickness direction of the substrate from the upper side to a middle region of the substrate between the upper side and the lower side. An upper rim of at least one of the plurality of through-channels directly contacts an upper rim of at least one other neighboring through-channel of the plurality of through-channels. There is also described a method of producing such a paper machine clothing.

Paper machine clothing and method of producing the clothing

An endless fabric belt for use in a paper, cardboard or tissue machine has machine-direction threads and cross-machine-direction threads. At least part of the threads are yarns composed substantially of a thermoplastic polymer material which is transparent for light of a wavelength. The fabric belt is a flat-weave with two front-side ends that are subsequently connected by bringing together end sections of the machine-direction threads in pairs with the formation of junction points and are woven with cross-machine-direction threads, forming a seam region. A material-to-material bond is formed in the seam region by absorbing light at the wavelength at yarn contact points. In the seam region, a plurality of spaced-apart, strip-shaped fabric sections are formed, in which the junction points and the yarn contact points which are connected to one another are arranged, and one strip-shaped fabric section without junction points is formed between two immediately adjacent fabric sections having the junction points.

Stabilized woven seam for flat-weave endless fabric belts

A fabric for a papermaking machine is in the form of an endless belt which is closed in the circulating direction. The fabric has a first layer and a second layer which is arranged on the first layer. Each layer is formed by one or by a plurality of film-shaped tapes which adjoin one another and are arranged next to one another in the direction transversely with respect to the circulating direction. The side edges, which adjoin one another, of two film-shaped tapes of one of the two layers are arranged between the side edges of the two layers are arranged between the end edges of adjoining end edges of film-shaped tapes of one of the two layers. The film-shaped tapes of one of the two layers are connected over their full area to the film-shaped tapes of the other of the two layers.

Laminated endless belt

A clothing fabric for a paper machine has two or more endless strips, which are each formed by a film-like web spliced along a joint to form a film-like web that is endless in the direction of circulation of the fabric. The endless strips are connected to one another at the side edges with the joints of two endless strips that are connected to each other are arranged to be offset in relation to one another with respect to the direction of circulation of the fabric.

Spliced endless clothing

A fabric for a papermaking machine is configured as a belt, the two side edges of which are configured in each case as closed lines. Furthermore, the belt is formed in one layer from a solid material and has pores which form passages between the two surfaces of the belt. The belt has regions with a width of approximately 400 micrometers (&#x3bc;m) or less. These regions extend in the longitudinal direction over the entire circumference of the belt, transversely with respect to the side edges, and include no pores formed therein.

Perforated film clothing

A clothing for a paper machine is configured as a film-shaped continuous band that is closed in the circumferential direction and that has a perforated useful area and at least one edge extending between the useful area and a lateral edge. The edge area has a perforation density lower than the perforation density of the useful area.

Perforated film clothing having a tear-resistant edge

A transport belt for a machine for producing a fiber material web, in particular paper or paperboard, has, on a web material side, a web material contact surface and, on a machine side, a machine contact surface, wherein a multiplicity of depressions are provided in the transport belt on the machine side.

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Steinheim, Germany

Michael Straub