Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Manufacturing Materials

Rotary-through-dryer-having-multiple-vacuum-chambers-and-associated-heaters

Web dryer apparatus having ventilating and impingement air bar assemblies

The present air bar finds particular utility for those situations where the coatings are quite ...

Water soluble polyols in combination with glyoxlated acrylamide/diallyldimethyl ammonium chloride polymers as Yankee dryer adhesive compositions

I claim: 1. A creping adhesive composition for creping cellulosic webs comprising: a) from 5 to 95 ...

Method for making a strong, bulky, absorbent paper sheet using restrained can drying

. It is an object of the present invention to provide a process for making a low density paper base ...

Arrangement in a dryer for a fibre web

We claim: PG,11 1. An arrangement in a dryer for a fibre web, the arrangement comprising: two ...

Papermachine clothing

We claim: 1. Papermachine clothing consisting essentially of partially fused particles, and a ...

Capillary dewatering method and apparatus

It is therefore an object of the present invention to provide a method and apparatus for removing a ...

Extended nip prepress for a paper web

It is an object of the invention to provide a new and improved prepress arrangement in which the ...

Chip spreader for air-lock feeder

The manufacture of cellulose paper products typically begins with the wood chip. Though cellulose ...

Cleaning apparatus for cleaning a forming wire

The present invention relates to a cleaning apparatus for cleaning a forming wire of a paper ...

Beam structure in a pulp machine/paper machine/board machine or in a paper/board finishing device

OF THE INVENTION Referring to FIGS. 1-2 wherein like reference numerals refer to the same or ...

Rotary through dryer having multiple vacuum chambers and associated heaters

Details

Inventors: Helversen, Frederick D.; Rivers, Morris R.;
Assignee: Helversen; Frederick D. (Portland, OR)
Primary Examiner: O'Dea; William F.
Assistant Examiner: Joyce; Harold
Attorney, Agent or Firm: Klarquist, Sparkman, Campbell, Leigh, Hall & Whinston

A fiber sheet manufacturing apparatus, such as a paper machine, is described, including a rotary through dryer for drying the sheet material on the same foraminous conveyor where it is initially formed. The dryer is provided with a plurality of separate vacuum chambers circumferentially spaced within the foraminous dryer drum, which are each in registration with a different one of a plurality of sources of hot air outside of the drum. The hot air is transmitted through the sheet material and the conveyor into the vacuum chambers to dry the sheet material. Each of the vacuum chambers and the hot air sources is independently controlled to provide different temperatures and vacuum pressures for more efficient and versatile operation. The air is transmitted from the vacuum chambers out of the drum through their separate exhaust conduits extending through the end of the drum and spaced from the drum support bearings. The drum supports and associated bearings are in the form of external trunion rollers which engage the opposite ends of the drum side wall to provide space for the vacuum chambers and exhaust conduits within the drum. The exhaust of one vacuum chamber is connected to the heat source of the next vacuum chamber to use heated air of the preceding chamber for heat conservation.

DETAILED DESCRIPTION We claim: 1.
A sheet drying apparatus comprising: a movable endless foraminous conveyor for carrying fibrous sheet material to be dried; forming means for forming said sheet material on said conveyor from liquid stodz deposited on said conveyor; a rotary dryer drum having foraminous side wall about which said conveyor extends for drying the sheet material on the same conveyor on which it is formed; support means including bearings for supporting the dryer drum for rotation; a plurality of separate vacuum chambers fixedly mounted within the dryer drum for drawing moisture from the sheet material into said chambers through said side wall of said drum, each chamber having a separate fixed exhaust conduit which extends out through an end of the dryer drum at a position radially spaced from the support means; vacuum means connected to the exhaust conduits of said vacuum chambers for independently controlling the vacuum pressures in said chambers; heating means outside of the dryer drum for causing heated gas to flow through the sheet material and said conveyor into said vacuum chambers for heating the sheet material in a plurality of heating zones of different temperatures positioned over and in registration with the vacuum chambers; and removal means for removing the sheet material from said conveyor after it is dryed.
2.
A drying apparatus in accordance with claim 1 in which the support means includes trunnion rollers engaging the side wall of the dryer drum and spaced from the foraminous conveyor and sheet material.
3.
A drying apparatus in accordance with claim 1 in which the trunnion rollers engage the outer surface of said side wall at the opposite ends of the dryer drum.
4.
A drying apparatus in accordance with claim 3 in which at least one of the trunnion rollers are driven by a motor to rotate the dryer drum which drives the conveyor.
5.
A drying apparatus in accordance with claim 1 in which the heating means supplies heated air which flows through the sheet material and the foraminous conveyor into the vacuum chambers

Related patents

	High velocity web floating air bar having air flow straightening means for air discharge slot means The present invention provides an elongated and generally tubular air bar which is adapted to be positioned closely adjacent to a running web for supporting the web on a ...
	Method for continuous drying of a cloth and an apparatus therefor The present invention is done in view of such circumstances. The object of the invention is to develop a method of continuously drying a cloth under no tension (shrink ...
	System for drying wet, porous webs We claim: 1. In a system for drying a wet, porous web with hot gases by flowing gas through the porous web: a stationary drum; a coaxial rotatable cylinder of larger ...
	Papermakers fabric of nonwoven layers in a laminated construction The present invention relates to a papermakers fabric which generally comprises a plurality of impervious nonwoven sheets joined together in a laminated arrangement to ...
	Arrangement for sealing a chamber containing pressure medium We claim: 1. An arrangement for sealing a chamber containing pressure medium against a movable band arranged to form one side of the chamber, comprising a sealing ...
	Fixation device OF THE DRAWINGS FIG. 1 discloses the principal structure of a fixation device according to the invention, comprising an upper structure 9 and a lower structure 10 ...
	Method for resisting formation of undulations in a fiber/water mixture during forming of a paper web in a paper-making machine The object of the present invention is to provide a novel method and arrangement with which the above-described detrimental undulation phenomena of a fiber/ water ...
	Method of and device for pocket ventilation in the drying section of a paper machine, in particular for high-speed paper machines What is claimed is: 1. Method of operating multi-cylinder dryers of a paper machine, where said dryers comprise two lines of drying cylinders (10, 11), in whose ...
	Extended nip-press The object of the present invention is to avoid the drawbacks that have previously been mentioned and to provide an extended-nip press construction wherein a closed ...
	Rotatable slot nozzle air bar The general purpose of the present invention is an air bar with a directionally rotatable slot nozzle in an inner rotatable baffle assembly. The rotatable baffle ...

0.004
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved