US340335A - Paper-making machine - Google Patents

Description

(No Model.)

W. A. LINDSAY.- l PAPER MAKING MACHINE. No. 340,335. Patented Apr. 20, 1886.

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WILLIAM A. LINDSAY, OF WILMINGTON, DELAWARE.

PAPER-MAKING MACHINE.

SPECIFICATION forming part of Letters Patent .110.340.335, dated April 20, 1886.

Application mea reti-Umea, ieee. serial No. 192,857. (No model.)

To a/ZZ whom it may concern:

Be it known that I, WILLIAM A. LINDsAY, a citizen of the United States, residing in XNTilniington, Delaware, have invented certain Improvements in Paper-Making Machines, of which the following is aspecitication.

My invention relates to that part of the machine in which the paper web is dried by passing it around heated cylinders, one object of my invention being to effect the drying of the paper more rapidly and uniformly than is possible in machines as at present constructed, and a further object being to provide a drierapron of a more durable character .than those now in use.

In the accompanying drawings, Figure l is a diagram illustrating sufficient of a papermaking machine to represent my invention, Fig. 2, a View showing one of the features of theinvention, and Figs. 3 and4 diagrams illustrating modiiications of the invention.

A A A2, &c., represent the successive drying-cylinders of the machine, which may be the usual hollow steam-heated cylinders, or may be constructed in any other desirable manner; and a are the rolls which serve to direct the web of paper, the latter entering the drier in the direction of the arrow from the second press-rolls, and passing from the drier to the calender-rolls. f

The web of paper is in contact with each of the drying-cylinders throughout the greater portion ofthe circumference of each cylinder, and said web is held in intimate contact with the cylinders by means of the drier-apron B, which passes part way round each cylinder, round directing-rollers b, and round stretching-rollers ci', by the adjustment of which the apron is maintained under proper tension. All these parts are arranged in the usual manner; but in the machine as at present constructed the drier-apron consists of a web of cotton cloth or canvas; or, in rare instances, a Woolen felt is employed. In either case, however, the websoon becomes so condensed as to be practicallyimpervious to and incapable of absorbing moisture, the result being that there is no driving off of moisture from the web of paper while it is conned between the drier-apron and the heated cylinder, the drying of the paper web being e'ected While it is exposed to the atmosphere in passing from one cylinder to another-for instance, between points a: w, Fig. l.

I have found that it is possible to use, in place of the usual drier apron or web of textile fabric, an apron of wire-gauze or perforated metal, the gauze being of such fine mesh thatit will not injurionsly indent the moist web of paper, and being composed of brass, copper, bronze, or other metal which will not become rusted, or, if composed of oxidizable metal, being galvanized or electroplated to prevent rust. A drier-apron of this character, while contining the web of paper snugly to the dryingcylinders, affords, as will be evident, a ready chance for the escape of moisture from that portion of the web which is in contact with the drying-cylinder, and therefore insures the drying of the vweb much more rapidly and. uniformly than is possible when the usual textiledrier-feltiselnployed. Thewire-gauze drier-apron, moreover, is practically indestructible, whereas the usual textile apron is rapidly destroyed by the continuous wetting and drying to which it is subjected.

In order to provide the opposite ends of the wire-gauze strips with loops, whereby said ends may be properly laced together, I interweave with the gauze, at and near each end, a wire, io, this wire forming projecting loops for the reception of thelacing-wire m, as shown vin Fig. 2, the extent of projection of the wire w into the gauze strip being differential, so that the strain will be distributed overalarge area of the strip.

As shown in Fig. 2, the lacing-loops at one l end of the strip alternate with those at the other end, but the loops may, if desired, be arranged opposite to each other, as shown in Fig. 3, and may belaced together, as shown in said figure; or the loops may be connected by means of a transverse rod, n, in the nature of a hinge-pintle, as shown in Fig. 4.

I claim as my inventionl. The combination of the drying-cylinders of a paper-making machine withadrier-apron consisting ot' wire-gauze or perforated sheet metal, all substantially as specified.

2. A drier apron for paper making machines, consisting of a wire-gauze strip, with each end of which is interwoven a wire form- IOO ing a series of projecting loops fox` the recep- In testimony whereof I-havcsigned my name tion of a lacing-wire, all substantially as set to this speoitcation in the presence of two sub- Io fo; th. scrbing witnesses.

3. The combination of the wireauze strip 5 forming the drier-apron, with theglacing-lool WILLIAM A' LINDSAY' Wire w, the extent ofprojection of which into VVitnessos: the strip is dcrential, all substantially as WILLIAM D'. CONNER, and for the purpose set forth.

HARRY SMITH.

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