Water-removing apparatus for papermaking process
First Claim
1. A water-removing apparatus for a papermaking process, the apparatus having a machine direction and a cross-machine direction perpendicular to the machine direction, the apparatus comprising:
- a web support designed to receive a fibrous web thereon and to carry the fibrous web in the machine direction;
at least one pulse generator designed to produce and discharge oscillatory flow-reversing air or gas having a predetermined frequency in the range of from 15 Hz to 1500 Hz; and
at least one gas-distributing system in fluid communication with the at least one pulse generator for delivering the oscillatory flow-reversing air or gas to a predetermined portion of the web, the gas-distributing system terminating with a plurality of discharge outlets juxtaposed with the web support such that the web support and the discharge outlets form an impingement region therebetween defined by an impingement distance, the plurality of the discharge outlets comprising a predetermined pattern defining an impingement area of the web corresponding thereto.
3 Assignments
0 Petitions
Accused Products
Abstract
A process and an apparatus for removing water from a fibrous web are disclosed. The process comprises providing a fibrous web having a moisture content from about 10% to about 90%; providing an oscillatory flow-reversing impingement gas having frequency of from 15 Hz to 1500 Hz; providing a gas-distributing system comprising a plurality of discharge outlets designed to emit the oscillatory flow-reversing impingement gas onto the web; and impinging the oscillatory flow-reversing gas onto the web through the plurality of discharge outlets, thereby removing moisture from the web. The apparatus comprises a web support designed to receive a fibrous web thereon and to carry it in a machine direction; at least one pulse generator designed to produce oscillatory flow-reversing air or gas; and at least one gas-distributing system in fluid communication with the pulse generator for delivering the oscillatory flow-reversing air or gas to the web. The gas-distributing system terminates with a plurality of discharge outlets juxtaposed with the web support such that the web support and the discharge outlets form an impingement distance therebetween, the plurality of the discharge outlets comprising a predetermined pattern defining an impingement area of the web.
-
Citations
23 Claims
-
1. A water-removing apparatus for a papermaking process, the apparatus having a machine direction and a cross-machine direction perpendicular to the machine direction, the apparatus comprising:
-
a web support designed to receive a fibrous web thereon and to carry the fibrous web in the machine direction; at least one pulse generator designed to produce and discharge oscillatory flow-reversing air or gas having a predetermined frequency in the range of from 15 Hz to 1500 Hz; and at least one gas-distributing system in fluid communication with the at least one pulse generator for delivering the oscillatory flow-reversing air or gas to a predetermined portion of the web, the gas-distributing system terminating with a plurality of discharge outlets juxtaposed with the web support such that the web support and the discharge outlets form an impingement region therebetween defined by an impingement distance, the plurality of the discharge outlets comprising a predetermined pattern defining an impingement area of the web corresponding thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A water-removing apparatus for a papermaking process, having a machine direction and a cross-machine direction perpendicular to the machine direction, the apparatus comprising:
-
a fluid-permeable web support designed to receive a fibrous web thereon and to carry the web in the machine direction; a pulse generator designed to generate oscillatory air or gas therein, having frequency from about 15 Hz to about 250 Hz; and a gas-distributing system in fluid communication with the pulse generator, the gas-distributing system terminating with a plurality of discharge outlets juxtaposed with the web support for delivering the oscillatory flow-reversing air or gas onto the web disposed on the web support, the web support and the discharge outlets forming an impingement distance Z therebetween, the plurality of the discharge outlets comprising a predetermined pattern defining an impingement area of the web corresponding thereto, the plurality of the discharge outlets providing a substantially uniform oscillatory field of flow-reversing gas between the impingement area and the discharge outlets; a means for generating a non-oscillatory and substantially steady-flow gas and impinging the non-oscillatory gas onto the impingement area of the web. - View Dependent Claims (21, 22)
-
-
23. A water-removal apparatus for use in a papermaking process, having a machine direction and a cross-machine direction perpendicular to the machine direction, the apparatus comprising:
-
a drying cylinder having a surface designed to carry a fibrous web thereon in the machine direction; and at least one pulse combustor comprising a combustion chamber designed to generate combustion gas therein, having a predetermined frequency from about 75 Hz to about 250 Hz, and a resonance gas-distributing system in fluid communication with the combustion chamber, for transforming the combustion gas into oscillatory flow-reversing gas and delivering the oscillatory flow-reversing gas onto the web, the resonance gas-distributing system terminating with a plurality of discharge outlets having a predetermined pattern and juxtaposed with the surface of the drying cylinder for impinging the oscillatory flow-reversing gas onto the web disposed thereon.
-
Specification