US 5,325,608 AGranted

Arrangement for the transfer of a traveling web

AssigneeJ.M. Voith GmbH

InventorWolfgang Mayer

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Abstract

An arrangement for transferring a paper web from the last drying cylinder of a first dryer group to the first dryer cylinder of a second dryer group. The last of the first drying cylinders lies outside a first endless loop porous support belt of the first dryer group. The first of the second drying cylinders lies outside a second endless loop porous support belt of the second dryer group. A first guide roll lies inside the loop of the first belt and is spaced from the first cylinder. A second guide roll lies inside the loop of the second belt, and is spaced from the second drying cylinder and along the path of the first belt between the first drying cylinder and the first guide roll. The second belt wraps around the second guide roll and the web on the first belt contacts the second belt on the path of the first belt toward the first guide roll. An air guide box upstream of the first guide roll directs air against the first belt into a wedge-shaped zone upstream in the travel path of the first belt for helping to transfer the web from the first belt to the second belt. The air guide box may have a stripper to strip air off the first belt, a wall that diverges from the first belt in the path toward the first guide roll, and a deflection surface for deflecting air passing along the first belt at the first guide roll.

Claims20

Dependent claims

An arrangement for transferring a traveling web to be dried from a first drying cylinder to a second drying cylinder, the arrangement comprising:

a first porous support belt for traveling together with the web, the first belt having a first side for supporting the web and the first side of the first belt first wrapping the web around the first cylinder and then passing with the web away from the first cylinder;
a first guide roll spaced away from the first cylinder, the first guide roll being free of suction devices;
the first belt having a second side opposite the first side thereof, the second side of the first belt wrapping around the first guide roll after the web has been separated from the first belt;
a second porous support belt for traveling with the web, the second support belt having a third side for receiving the web from the first support belt and for supporting the web and having an opposite fourth side;
a second guide roll over which the fourth side of the second support belt wraps, thereby forming a wrapping zone along the second guide roll;
the second guide roll being free of suction devices;
the second drying cylinder being placed with respect to the first and second guide rolls such that the web is transferred from the first side of the first support belt to the third side of the second support belt and the web then passes on the third side of the second support belt and is wrapped directly around the second drying cylinder;
the first cylinder and the first guide roll defining a travel path for the first support belt therebetween;
the second guide roll being placed near the travel path of the first support belt from the first drying cylinder to the first guide roll;
the travel path of the first support belt in the direction toward the first guide roll passing said wrapping zone and that passing is located at a first distance upstream in the path of the first support belt from where the first support belt meets the first guide roll to wrap therearound;
air guide means located above the second side of the first support belt, along the travel path of the first support belt, and at the first guide roll upstream in the travel path of the first support belt where the first support belt contacts the first guide roll, said air guide means being provided for directing air through the first porous support belt to separate the web from the first support belt and bring the separated web into supporting contact with the second support belt, such that the second support belt receives the web and thereafter supports the web to move the web toward the second cylinder.

8 more elements

An arrangement for transferring a traveling web to be dried from a first drying cylinder to a second drying cylinder, the arrangement comprising:

a first porous support belt for traveling together with the web, the first belt having a first side for supporting the web and the first side of the first belt first wrapping the web around the first cylinder and then passing with the web away from the first cylinder;
a first guide roll spaced away from the first cylinder, the first guide roll being free of suction devices;
the first belt having a second side opposite the first side thereof, the second side of the first belt wrapping around the first guide roll after the web has been separated from the first belt;
a second porous support belt for traveling with the web, the second support belt having a third side for receiving the web from the first support belt and for supporting the web and having an opposite fourth side;
a second guide roll over which the fourth side of the second support belt wraps, thereby forming a wrapping zone along the second guide roll;
the second guide roll being free of suction devices;
the second drying cylinder being placed with respect to the first and second guide rolls such that the web is transferred from the first side of the first support belt to the third side of the second support belt and the web then passes on the third side of the second support belt and is wrapped directly around the second drying cylinder;
the first cylinder and the first guide roll defining a travel path for the first support belt therebetween;
the second guide roll being placed near the travel path of the first support belt from the first drying cylinder to the first guide roll;
the travel path of the first support belt in the direction toward the first guide roll passing said wrapping zone and that passing is located at a first distance upstream in the path of the first support belt from where the first support belt meets the first guide roll to wrap therearound;
air guide means located above the second side of the first support belt, along the travel path of the first support belt, and at the first guide roll upstream in the travel path of the first support belt where the first support belt contacts the first guide roll, said air guide means being provided for directing air through the first porous support belt to separate the web from the first support belt and bring the separated web into supporting contact with the second support belt, such that the second support belt receives the web and thereafter supports the web to move the web toward the second cylinder;
and
an air deflection surface formed on the air guide means and generally at a location past the second guide roll in the travel path of the first support belt toward the first guide roll, the air deflection surface being directed to deflect a layer of boundary air, which arrives with the second side of the first support belt, through the porous first support belt to help separate the web from the first side of the first support belt and to help transfer the web to the third side of the second support belt.

10 more elements

An arrangement for transferring a traveling web to be dried from a first drying cylinder to a second drying cylinder, the arrangement comprising:

a first porous support belt for traveling together with the web, the first belt having a first side for supporting the web and the first side of the first belt first wrapping the web around the first cylinder and then passing with the web away from the first cylinder;
a first guide roll spaced away from the first cylinder, the first guide roll being free of suction devices;
the first belt having a second side opposite the first side thereof, the second side of the first belt wrapping around the first guide roll after the web has been separated from the first belt;
a second porous support belt for traveling with the web, the second support belt having a third side for receiving the web from the first support belt and for supporting the web and having an opposite fourth side;
a second guide roll over which the fourth side of the second support belt wraps, thereby forming a wrapping zone along the second guide roll;
the second guide roll being free of suction devices;
the second drying cylinder being placed with respect to the first and second guide rolls such that the web is transferred from the first side of the first support belt to the third side of the second support belt and the web then passes on the third side of the second support belt and is wrapped directly around the second drying cylinder;
the first cylinder and the first guide roll defining a travel path for the first support belt therebetween;
the second guide roll being placed near the travel path of the first support belt from the first drying cylinder to the first guide roll;
the travel path of the first support belt in the direction toward the first guide roll passing said wrapping zone and that passing is located at a first distance upstream in the path of the first support belt from where the first support belt meets the first guide roll to wrap therearound;
air guide means located above the second side of the first support belt, along the travel path of the first support belt, and at the first guide roll upstream in the travel path of the first support belt where the first support belt contacts the first guide roll, said air guide means being shaped and adapted to direct air through the first porous support belt to separate the web from the first support belt and bring the separated web into supporting contact with the second support belt, such that the second support belt receives the web and thereafter supports the web to move the web toward the second cylinder;
and
air deflection means formed on the air guide means and generally at a location past the second guide roll in the travel path of the first support belt toward the first guide roll, the air deflection surface directing air through the porous first support belt to help separate the web from the first side of the first support belt and to help transfer the web to the third side of the second support belt.

10 more elements

An arrangement for transferring a traveling web to be dried from a first drying cylinder to a second drying cylinder, the arrangement comprising:

a first porous support belt for traveling together with the web, the first belt having a first side for supporting the web and the first side of the first belt first wrapping the web around the first cylinder and then passing with the web away from the first cylinder;
a first guide roll spaced away from the first cylinder, the first guide roll being free of suction devices;
the first belt having a second side opposite the first side thereof, the second side of the first belt wrapping around the first guide roll after the web has been separated from the first belt;
a second porous support belt for traveling with the web, the second support belt having a third side for receiving the web from the first support belt and for supporting the web and having an opposite fourth side;
a second guide roll over which the fourth side of the second support belt wraps, thereby forming a wrapping zone along the second guide roll;
the second guide roll being free of suction devices;
the second drying cylinder being placed with respect to the first and second guide rolls such that the web is transferred from the first side of the first support belt to the third side of the second support belt and the web then passes on the third side of the second support belt and is wrapped directly around the second drying cylinder;
the first cylinder and the first guide roll defining a travel path for the first support belt therebetween;
the second guide roll being placed near the travel path of the first support belt from the first drying cylinder to the first guide roll;
the travel path of the first support belt in the direction toward the first guide roll passing said wrapping zone and that passing is located at a first distance upstream in the path of the first support belt from where the first support belt meets the first guide roll to wrap therearound;
air guide means located above the second side of the first support belt, along the travel path of the first support belt, and at the first guide roll upstream in the travel path of the first support belt where the first support belt contacts the first guide roll, said air guide means being provided for directing air through the first porous support belt to separate the web from the first support belt and bring the separated web into supporting contact with the second support belt, such that the second support belt receives the web and thereafter supports the web to move the web toward the second cylinder;
and
blast openings defined in the air guide means for directing an air blast from the air guide means toward the second side of the first support belt in the region of the path of the first support belt after the first support belt contacts the second guide roll and before the first support belt contacts the first guide roll.

10 more elements

Dependencies are inferred from the claim text.