# US 6,294,050 B1 · Drying end of a machine for the production of a material web and method of drying a material web

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- Number: US 6,294,050 B1
- Document ID: US6294050B1
- Status: Granted
- Kind: B1
- Application number: 09/393,691
- Filed: 1999-09-10
- Granted: 2001-09-25
- Earliest claimed: 1998-09-11
- Assignees: Voith Sulzer Papiertechnik Patent GmbH
- Inventors: Markus Oechsle; Tri Chau-Huu; Roland Mayer
- Web page: https://patentgrep.com/patent/US6294050B1

## CPC

- D21F 5/182: {through perforated cylinders}
- D21F 5/00: Dryer section of machines for making continuous webs of paper
- D21F 5/18: Drying webs by hot air
- D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON

## Abstract

Drying end of a machine for the production of a material web such as paper or cardboard. The drying end includes at least one impact flow drier configured to bombard at least one surface of the material web with hot air or hot steam impact flow. Also provided is a method for drying a material web including bombarding the material web on at least one surface with hot air or hot steam impact flow, via at least one impact flow drier.

## Claims

### Claim 1

A drying end of a machine for the production of a material web, the material web having a top surface and a botton surface, the drying end comprising:
at least one impact flow drier configured to bombard at least one surface of the material web with at least one of hot air hot steam impact flow,
wherein a temperature of the at least one of hot air hot steam impact flow is at least approximately 150° C.

### Claim 2 (depends on 1)

The drying end according to claim 1, further comprising an open support surface over which the material web is guided by the surface opposite the surface bombarded with the impact flow.

### Claim 3 (depends on 1)

The drying end according to claim 1, further comprising a steam suction device provided on at least one of said at least one impact flow drier, the impact flow dried being configured to simultaneously dry the material web and remove steam.

### Claim 4 (depends on 2)

The drying end according to claim 2, further comprising a cover wire positioned between the material web and said at least one impact flow drier, wherein said cover wire and the material web are adapted to be guided together over said support surface.

### Claim 5 (depends on 2)

The drying end according to claim 2, further comprising a support roll over which the material web is adapted to be guided, and wherein said open support surface comprises one of the surface of said support roll, a covering over said support roll, a coating of said support roll and a continuous belt adapted to be guided over said support roll.

### Claim 6 (depends on 5)

The drying end according to claim 5, wherein said support roll has an external diameter in the range from approximately 2 meters to approximately 10 meters.

### Claim 7 (depends on 5)

The drying end according to claim 5, wherein said open support surface comprises a surface of a continuous belt adapted to be guided over said support roll, said continuous belt comprising an air-permeable wire.

### Claim 8 (depends on 5)

The drying end according to claim 5, wherein said open support surface comprises a surface of a continuous belt adapted to be guided over said support roll, said continuous belt comprising an air-impermeable transport belt.

### Claim 9 (depends on 5)

The drying end according to claim 5, wherein said open support surface comprises a shrink wire installed on the support roll.

### Claim 10 (depends on 5)

The drying end according to claim 5, wherein said support roll has one of a solid sleeve design and a spoke/lattice design.

### Claim 11 (depends on 2)

The drying end according to claim 2, wherein said open support surface comprises a surface of a support belt, said support belt configured to be guided over a plurality of support rolls.

### Claim 12 (depends on 11)

The drying end according to claim 11, wherein said support rolls are arranged in an arc.

### Claim 13 (depends on 11)

The drying end according claim 11, wherein said support belt is configured to be guided in the shape of a polygon.

### Claim 14 (depends on 5)

The drying end according to claim 5, wherein said support rolls lie in one of a plane and a curve.

### Claim 15 (depends on 2)

The drying end according to claim 2, wherein said open support surface is divided into a plurality of sections, each said section being flat.

### Claim 16 (depends on 11)

The drying end according to claim 11, wherein said support belt is constructed of one of metal and plastic.

### Claim 17 (depends on 11)

The drying end according to claim 11, wherein said support belt is air-impermeable.

### Claim 18 (depends on 17)

The drying end according to claim 17, wherein said support belt is constructed of an air-impermeable fabric.

### Claim 19 (depends on 4)

The drying end according to claim 4, wherein said cover wire is constructed of one of metal and plastic.

### Claim 20 (depends on 2)

The drying end according to claim 2, wherein said support surface further comprises a removal zone, said support surface being adapted to bombard the material web with compressed air through the support surface at least in said removal zone, whereby the web may be removed from the support surface.

### Claim 21 (depends on 1)

The drying end according to claim 1, further comprising a support roll comprising one of perforations and a lattice structure, said support roll adapted to guide the material web thereover, said support roll further adapted for bombardment on the inside thereof with compressed air.

### Claim 22 (depends on 21)

The drying end according to claim 21, wherein said support roll further comprises a removal zone, and said support roll is adapted for bombardment on the inside thereof at least at said removal zone, whereby the web may be removed from the support roll.

### Claim 23 (depends on 22)

The drying end according to claim 22, further comprising a cover wire positioned between the material web and said at least one impact flow drier, wherein said cover wire and the material web are adapted to be guided together over said support surface, whereby the web and said cover wire may be removed from the support roll.

### Claim 24 (depends on 20)

The drying end according to claim 20, wherein the temperature of the compressed air is higher than approximately 20° C.

### Claim 25 (depends on 1)

The drying end according to claim 1, wherein said at least one of hot air and hot steam impact flow has a temperature in the range from approximately 150° C. to approximately 450° C., and is further adapted to be generated by at least one of said at least one impact flow drier.

### Claim 26 (depends on 1)

The drying end according to claim 1, wherein at least one of said at least one impact flow drier comprises a plurality of nozzles.

### Claim 27 (depends on 1)

The drying end according to claim 1, wherein at least one of said at least one impact flow drier comprises at least one drier hood.

### Claim 28 (depends on 1)

The drying end according to claim 1, further comprising at least two support rolls positioned in series in the direction of web travel, each said support roll being operatively arranged with a respective said impact flow drier.

### Claim 29 (depends on 28)

The drying end according to claim 28, wherein each of said at least two support rolls has a different diameter.

### Claim 30 (depends on 1)

The drying end according to claim 1, wherein at least one of said at least one impact flow drier has a drier hood, said drier hood being subdivided into zones according to at least one of a direction of web travel and right angles to a direction of web travel.

### Claim 31 (depends on 26)

The drying end according to claim 26, wherein each said nozzle has a fixed and identical distance from the material web during operation.

### Claim 32 (depends on 31)

The drying end according to claim 31, wherein the distance of each said nozzle from the material web is in the range from approximately 10 mm to approximately 50 mm.

### Claim 33 (depends on 1)

The drying end according to claim 1, wherein the flow speed of said at least one of hot air and hot steam impact flow is in the range from approximately 60 meters/second to approximately 120 meters/second.

### Claim 34 (depends on 2)

The drying end according to claim 2, wherein at least one of said at least one impact flow drier is positioned above the material web and is operatively arranged with a respective said support surface positioned below the material web.

### Claim 35 (depends on 2)

The drying end according to claim 2, wherein at least one of said at least one impact flow drier is positioned below the material web and is operatively arranged with a respective said support surface positioned above the material web.

### Claim 36 (depends on 1)

The drying end according to claim 1, wherein the material web is adapted to be simultaneously bombarded on both surfaces in at least one zone by a respective said at least one of hot air and hot steam impact flow.

### Claim 37 (depends on 36)

The drying end according to claim 36, wherein the material web is adapted to be guided through said at least one zone between two wire belts.

### Claim 38 (depends on 36)

The drying end according to claim 36, wherein the material web is adapted to be guided through said at least one zone by one of along a linear and curved path.

### Claim 39 (depends on 36)

The drying end according to claim 36, wherein at least one said wire belt is guided over a plurality of support rolls.

### Claim 40 (depends on 39)

The drying end according to claim 39, wherein said plurality of support rolls lie in one of a single plane and a curved surface.

### Claim 41 (depends on 37)

The drying end according to claim 37, wherein at least one said wire belt is constructed of one of metal and plastic.

### Claim 42 (depends on 1)

The drying end according to claim 1, further comprising a starting zone, wherein at least one of said at least one impact flow drier is provided in the starting zone.

### Claim 43 (depends on 1)

The drying end according to claim 1, further comprising:
at least one drying group comprising at least one drying cylinder;
wherein:
at least one of said at least one impact flow drier is located upstream of said at least one drying group in a direction of web travel; and
the material web has a solids content which is greater than approximately 55% to approximately 70% upon reaching said at least one drying cylinder.

### Claim 44 (depends on 1)

The drying end according to claim 1, further comprising at least one of at least one one-row drying group and at least one two-row drying group.

### Claim 45 (depends on 1)

The drying end according to claim 1, further comprising an end zone, wherein at least one of said at least one impact flow drier is provided in said end zone.

### Claim 46 (depends on 1)

The drying end according to claim 1, further comprising an evaporation zone, wherein at least one of at least one impact flow drier is provided in the evaporation zone.

### Claim 47 (depends on 1)

The drying end according to claim 1, wherein said at least one impact flow drier is at least two impact flow driers positioned in series in a direction of web travel, said at least two impact flow driers being configured to bombard the material web from opposite web surfaces with said at least one of hot air and hot steam impact flow.

### Claim 48 (depends on 1)

The drying end according to claim 1, wherein said at least one impact flow drier is at least two impact flow driers positioned in series in a direction of web travel, said at least two impact flow driers being configured to bombard the material web from one web surface with said at least one of hot air and hot steam impact flow.

### Claim 49 (depends on 1)

The drying end according to claim 1, further comprising at least two intermediate impact flow driers positioned opposite each other and configured to bombard the material web from opposite surfaces.

### Claim 50 (depends on 47)

The drying end according to claim 47, further comprising at least one intermediate impact flow drier configured to bombard the material web from opposite web surfaces with said at least one of hot air and hot steam impact flow, said at least one intermediate impact flow drier being positioned intermediate said at least two impact flow driers.

### Claim 51 (depends on 48)

The drying end according claim 48, further comprising at least one intermediate impact flow drier configured to bombard the material web from opposite web surfaces with said at least one of hot air and hot steam impact flow, said at least one intermediate impact flow drier being positioned intermediate said at least two impact flow driers.

### Claim 52 (depends on 1)

The drying end according to claim 1, further comprising at least one group of three sequentially-positioned impact flow drier units, at least one said unit being an opposing impact flow drier, wherein the material web is adapted to be guided through said at least one group along a first arc, one of a plane and a curved surface, and along a second arc.

### Claim 53 (depends on 1)

The drying end according to claim 1, wherein said at least one impact flow drier is a plurality of impact flow driers sequentially positioned in a web travel direction, said plurality of impact flow driers being adapted to alternatingly bombard opposite surfaces of the material web.

### Claim 54 (depends on 1)

The drying end according to claim 1 in particular, wherein the material web is one of paper and cardboard.

### Claim 55

A method for drying a material web comprising:
bombarding the material web on at least one surface with at least one of hot air and hot steam impact flow, via at least one impact flow drier,
wherein a temperature of the at least one of hot air and hot steam impact flow is at least approximately 150° C.

### Claim 56 (depends on 55)

The method according to claim 55, further comprising guiding the material web over an open support surface by the surface of the material web opposite the surface bombarded with the impact flow.

### Claim 57 (depends on 55)

The method according to claim 55, further comprising simultaneously drying the material web and removing steam via a steam suction device provided on at least one impact flow drier.

### Claim 58 (depends on 56)

The method according to claim 56, further comprising guiding the material web over the support surface together with a cover wire positioned between the material web and the at least one impact flow drier.

### Claim 59 (depends on 56)

The method according to claim 56, further comprising guiding the material web over a support roll, and wherein the open support surface comprises one of the surface of the support roll, a covering over the support roll, a coating of the support roll and a continuous belt that is guided over the support roll.

### Claim 60 (depends on 59)

The method according to claim 59, wherein the support roll has an external diameter in the range from approximately 2 meters to approximately 10 meters.

### Claim 61 (depends on 59)

The method according to claim 59, wherein the open support surface comprises a surface of a continuous belt, the method further comprising guiding the continuous belt over the support roll, the continuous belt comprising an air-permeable wire.

### Claim 62 (depends on 59)

The method according to claim 59, wherein the open support surface comprises a surface of a continuous belt, the method further comprising guiding the continuous belt over the support roll, the continuous belt comprising an air-impermeable transport belt.

### Claim 63 (depends on 59)

The method according to claim 59, wherein the open support surface comprises a shrink wire installed on the support roll.

### Claim 64 (depends on 59)

The method according to claim 59, wherein the support roll has one of a solid sleeve design and a spoke/lattice design.

### Claim 65 (depends on 56)

The method according to claim 56, wherein the open support surface comprises a surface of a support belt, the method further comprising guiding the continuous belt over a plurality of support rolls.

### Claim 66 (depends on 65)

The method according to claim 65, further comprising arranging the support rolls in an arc.

### Claim 67 (depends on 65)

The method according claim 65, further comprising guiding the support belt in the shape of a polygon.

### Claim 68 (depends on 59)

The method according to claim 59, wherein the support rolls lie in one of a plane and a curve.

### Claim 69 (depends on 56)

The method according to claim 56, wherein the open support surface is divided into a plurality of sections, each section being flat.

### Claim 70 (depends on 65)

The method according to claim 65, wherein the support belt is constructed of one of metal and plastic.

### Claim 71 (depends on 65)

The method according to claim 65, wherein the support belt is air-impermeable.

### Claim 72 (depends on 71)

The method according to claim 71, wherein the support belt is constructed of an air-impermeable fabric.

### Claim 73 (depends on 58)

The method according to claim 58, wherein the cover wire is constructed of one of metal and plastic.

### Claim 74 (depends on 56)

The method according to claim 56, further comprising:
bombarding the material web with compressed air through the support surface at least in a removal zone; and
removing the web from the support surface.

### Claim 75 (depends on 55)

The method according to claim 55, further comprising:
guiding the material web over a support roll, the support roll having one of perforations and a lattice structure; and
bombarding the support roll from the inside with compressed air, at least in zones.

### Claim 76 (depends on 75)

The method according to claim 75, further comprising:
bombarding the support roll with compressed air, at least in a removal zone; and
removing the web from the support roll.

### Claim 77 (depends on 76)

The method according to claim 76, further comprising:
guiding a cover wire and the material web together over the support surface, the cover wire positioned between the material web and the at least one impact flow drier; and
removing the web and cover wire from the support roll.

### Claim 78 (depends on 74)

The method according to claim 74, wherein the temperature of the compressed air is higher than approximately 20° C.

### Claim 79 (depends on 55)

The method according to claim 55, further comprising generating the at least one of hot air and hot steam impact flow having a temperature in the range from approximately 150° C. to approximately 450° C.

### Claim 80 (depends on 55)

The method according to claim 55, wherein at least one of the at least one impact flow drier includes a plurality of nozzles.

### Claim 81 (depends on 55)

The method according to claim 55, wherein at least one of the at least one impact flow drier includes at least one drier hood.

### Claim 82 (depends on 55)

The method according to claim 55, further comprising:
positioning at least two support rolls in series in the direction of web travel; and
operatively arranging each support roll with a respective impact flow drier.

### Claim 83 (depends on 82)

The method according to claim 82, wherein each of the at least two support rolls has a different diameter.

### Claim 84 (depends on 55)

The method according to claim 55, wherein at least one of the at least one impact flow drier has a drier hood, the drier hood being subdivided into zones according to at least one of a direction of web travel and right angles to a direction of web travel.

### Claim 85 (depends on 80)

The method according to claim 80, wherein each nozzle has a fixed and identical distance from the material web during operation.

### Claim 86 (depends on 85)

The method according to claim 85, wherein the distance of each nozzle from the material web is in the range from approximately 10 mm to approximately 50 mm.

### Claim 87 (depends on 55)

The method according to claim 55, wherein the flow speed of the at least one of hot air and hot steam impact flow is in the range from approximately 60 meters/second to approximately 120 meters/second.

### Claim 88 (depends on 56)

The method according to claim 56, further comprising:
positioning at least one impact flow drier above the material web; and
operatively arranging the at least one impact flow drier with a respective support surface positioned below the material web.

### Claim 89 (depends on 56)

The method according to claim 56, further comprising:
positioning at least one impact flow drier below the material web; and
operatively arranging the at least one impact flow drier with a respective support surface positioned above the material web.

### Claim 90 (depends on 55)

The method according to claim 55, further comprising simultaneously bombarding both surfaces of the material web in at least one zone by a respective at least one of hot air and hot steam impact flow.

### Claim 91 (depends on 90)

The method according to claim 90, further comprising guiding the material web through the at least one zone between two wire belts.

### Claim 92 (depends on 90)

The method according to claim 90, further comprising guiding the material web through the at least one zone by one of along a linear and curved path.

### Claim 93 (depends on 90)

The method according to claim 90, further comprising guiding at least one wire belt over a plurality of support rolls.

### Claim 94 (depends on 93)

The method according to claim 93, wherein the plurality of support rolls lie in one of a plane and a curve.

### Claim 95 (depends on 91)

The method according to claim 91, wherein at least one wire belt is constructed of one of metal and plastic.

### Claim 96 (depends on 55)

The method according to claim 55, further comprising providing at least one of the at least one impact flow drier in a starting zone.

### Claim 97 (depends on 55)

The method according to claim 55, further comprising positioning at least one of the at least one impact flow drier upstream of at least one drying group in a direction of web travel, wherein the material web has a solids content which is greater than approximately 55% to approximately 70% upon reaching the at least one drying cylinder.

### Claim 98 (depends on 55)

The method according to claim 55, further comprising providing at least one of at least one one-row drying group and at least one two-row drying group.

### Claim 99 (depends on 55)

The method according to claim 55, further comprising providing at least one of the at least one impact flow drier in an end zone.

### Claim 100 (depends on 55)

The method according to claim 55, further comprising providing an impact flow drier in an evaporation zone.

### Claim 101 (depends on 55)

The method according to claim 55, further comprising:
positioning in series at least two impact flow driers in a direction of web travel; and
bombarding, by the at least two impact flow driers, the material web from opposite web surfaces with the at least one of hot air and hot steam impact flow.

### Claim 102 (depends on 55)

The method according to claim 55, further comprising:
positioning in series at least two impact flow driers in a direction of web travel
bombarding, by the at least two impact flow driers, the material web from the same web surface with the at least one of hot air and hot steam impact flow.

### Claim 103 (depends on 55)

The method according to claim 55, further comprising:
positioning at least two intermediate impact flow driers opposite each other; and
bombarding the material web from opposite web surfaces.

### Claim 104 (depends on 101)

The method according to claim 101, further comprising:
positioning at least one intermediate impact flow drier between the at least two impact flow driers; and
bombarding the material web from opposite web surfaces by the at least one intermediate impact flow drier with the at least one of hot air and hot steam impact flow.

### Claim 105 (depends on 102)

The method according claim 102, further comprising:
positioning at least one intermediate impact flow drier intermediate the at least two impact flow driers; and
bombarding the material web from opposite web surfaces by the at least one intermediate impact flow drier with the at least one of hot air and hot steam impact flow.

### Claim 106 (depends on 55)

The method according to claim 55, further comprising:
guiding the material web through at least one group along a first arc, each group having three sequentially-positioned impact flow driers, at least one of which is an opposing impact flow drier;
guiding the material web through one of a plane and a curved surface; and
guiding the material web along a second arc.

### Claim 107 (depends on 55)

The method according to claim 55, further comprising:
sequentially positioning a plurality of impact flow driers in a web travel direction; and
alternatingly bombarding, by the plurality of impact flow driers, opposite surfaces of the material web.

### Claim 108 (depends on 55)

The method according to claim 55 in particular, wherein the material web is one of paper and cardboard.

### Claim 109

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
an impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow;
a support roll operatively arranged below said impact flow drier;
a cover wire adapted to cover the top surface of said material web during bombardment; and
a continuous belt having an open support surface over which the material web is guided, said continuous belt adapted to be guided about said support roll with the material web between said continuous belt and cover wire during bombardment,
wherein a temperature of the at least one of hot air and hot steam impact flow is at least approximately 150° C.

### Claim 110

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
a first impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow;
a first support roll operatively arranged below said impact flow drier;
a first cover wire adapted to cover the top surface of said material web during bombardment;
a first continuous belt having an open support surface over which the material web is guided, said continuous belt adapted to be guided about said support roll with the material web between said first continuous belt and said first cover wire during bombardment;
a second impact flow drier configured to bombard the bottom surface of the material web with at least one of hot air and hot steam impact flow, said second impact flow drier positioned downstream of said first impact flow drier, in a direction of web travel;
a second support roll operatively arranged above said second impact flow drier;
a second cover wire adapted to cover the bottom surface of said material web during bombardment; and
a second continuous belt having an open support surface over which the material web is guided, said second continuous belt adapted to be guided about said second support roll with the material web between said second continuous belt and said second cover wire during bombardment.

### Claim 111

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
a first impact flow drier configured to bombard the bottom surface of the material web with at least one of hot air and hot steam impact flow;
a first support roll operatively arranged above said impact flow drier;
a first cover wire adapted to cover the bottom surface of said material web during bombardment;
a first continuous belt having an open support surface over which the material web is guided, said continuous belt adapted to be guided about said support roll with the material web between said first continuous belt and said first cover wire during bombardment;
a second impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow, said second impact flow drier positioned downstream of said first impact flow drier, in a direction of web travel;
a second support roll operatively arranged below said second impact flow drier;
a second cover wire adapted to cover the top surface of said material web during bombardment; and
a second continuous belt having an open support surface over which the material web is guided, said second continuous belt adapted to be guided about said second support roll with the material web between said second continuous belt and said second cover wire during bombardment.

### Claim 112

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
a first impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow;
a first support roll operatively arranged below said impact flow drier;
a first continuous belt having an open support surface over which the material web is guided;
a second impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow, said second impact flow drier positioned downstream of said first impact flow drier, in a direction of web travel;
a second support roll operatively arranged below said second impact flow drier;
a second continuous belt having an open support surface over which the material web is guided
a cover wire adapted to cover the top surface of said material web during bombardment and during travel between both said support rolls, and guided about said first and said second support rolls, with the material web between said first continuous belt and said cover wire during bombardment by said first impact flow drier, and with the material web between said second continuous belt and said cover wire during bombardment by said second impact flow drier.

### Claim 113

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
an impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow;
a plurality of support rolls operatively arranged below said impact flow drier and arranged in an arc;
a cover wire adapted to cover the top surface of said material web during bombardment; and
a continuous belt having an open support surface over which the material web is guided, said continuous belt adapted to be guided about said plurality of support rolls with the material web between said continuous belt and cover wire during bombardment.

### Claim 114

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
a plurality of impact flow driers configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow, said plurality of impact flow driers sequentially positioned along a of web travel direction;
a plurality of support rolls operatively arranged below said impact flow drier;
a cover wire adapted to cover the top surface of said material web during bombardment;
a common support belt having an open support surface over which the material web is guided, said common support belt adapted to be guided about said plurality of support rolls with the material web between said continuous belt and said cover wire during bombardment.

### Claim 115

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
a first impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow;
a first latticed support roll operatively arranged below said first impact flow drier and coated with a shrink wire over which the material web is guided, and further having an internal blast chamber;
a second impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow, said second impact flow drier positioned downstream of said first impact flow drier, in a direction of web travel;
a second latticed support roll operatively arranged below said second impact flow drier and coated with a shrink wire over which the material web is guided, and further having an internal blast chamber;
a top intermediate impact flow drier and a bottom intermediate impact flow drier positioned one above the other and adapted to bombard both surfaces of the material web, said top and bottom intermediate impact flow driers positioned between said first and second latticed support rolls;
a cover wire adapted to cover the top surface of said material web during bombardment and during travel between both said support rolls, and guided about said first and said second latticed support rolls, with the material web between said first latticed support roll and said cover wire during bombardment by said first impact flow drier, with the material web between a wire belt and said cover wire during bombardment by said intermediate impact flow driers, and with the material web between said second latticed support roll and said cover wire during bombardment by said second impact flow drier.

### Claim 116

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
a first impact flow drier configured to bombard the bottom surface of the material web with at least one of hot air and hot steam impact flow;
a first latticed support roll operatively arranged above said first impact flow drier and coated with a shrink wire over which the material web is guided, and further having an internal blast chamber;
a second impact flow drier configured to bombard the bottom surface of the material web with at least one of hot air and hot steam impact flow, said second impact flow drier positioned downstream of said first impact flow drier, in a direction of web travel;
a second latticed support roll operatively arranged above said second impact flow drier and coated with a shrink wire over which the material web is guided, and further having an internal blast chamber;
a top intermediate impact flow drier adapted to bombard the top surface of the material web and positioned between said first and second latticed support rolls;
a plurality of support rolls arranged in an arc below said top intermediate impact flow drier;
a cover wire adapted to cover the top surface of said material web during bombardment and during travel between both said support rolls, and guided about said first and said second latticed support rolls, with the material web between said first latticed support roll and said cover wire during bombardment by said first impact flow drier, with the material web between a wire belt and said cover wire during bombardment by said top intermediate impact flow drier, and with the material web between said second latticed support roll and said cover wire during bombardment by said second impact flow drier.

### Claim 117

A drying end of a machine for the production of a material web, the material web having a top surface and a bottom surface, the drying end comprising:
an impact flow drier configured to bombard the top surface of the material web with at least one of hot air and hot steam impact flow;
a support roll operatively arranged below said impact flow drier;
a continuous belt having an open support surface over which the material web is guided, said continuous belt adapted to be guided about a portion of said support roll;
a top intermediate impact flow drier and a bottom intermediate impact flow drier positioned one above the other and adapted to bombard both surfaces of the material web, said top and bottom intermediate impact flow driers positioned downstream of said support roll in a direction of web travel; and
a cover wire adapted to cover the top surface of said material web during bombardment by said impact flow drier and said intermediate flow driers, and guided about a portion of said support roll, with the material web between said continuous belt and said cover wire during bombardment by said impact flow drier, and with the material web between a wire belt and said cover wire during bombardment by said intermediate impact flow driers.

### Claim 118 (depends on 1)

The drying end in accordance with claim 1, wherein a flow speed of the at least one of hot air and hot steam impact flow is at least approximately 60 m/s.

### Claim 119 (depends on 1)

The drying end in accordance with claim 1, further comprising an open support surface and a cover wire,
wherein the open support and the cover wire are arranged to sandwich the material web and to guide the material web past the at least one impact flow drier.

### Claim 120 (depends on 55)

The method in accordance with claim 55, wherein a flow speed of the at least one of hot air and hot steam impact flow is at least approximately 60 m/s.

### Claim 121 (depends on 55)

The method in accordance with claim 55, further comprising guiding an open support and a cover wire past the at least one impact flow drier,
wherein the material web is sandwiched between the open support and the cover wire past the at least one impact flow drier.

### Claim 122 (depends on 109)

The drying end in accordance with claim 109, wherein a flow speed of the at least one of hot air and hot steam impact flow is at least approximately 60 m/s.