US2039308A

US2039308A - Means for extracting water from webs of pulp or paper

Info

Publication number: US2039308A
Application number: US732426A
Authority: US
Inventors: Evans William Parsonage
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-06-26
Filing date: 1934-06-26
Publication date: 1936-05-05
Anticipated expiration: 1953-05-05

Description

S OF PULP OR PAPER May 5,- 1936. w. P. EVANS MEANS FOR EXTRACTING WATER FROM WEB Filed June 26, 1934 2 Sheets-Sheet 1 v INVENTOQ'. wuunn PnRsoNnaE Evans HTTORNE W. P. EVANS May 5, 1936.

MEANS FOR EXTRACTING WATER FROM WEBS OF PULP OR PAPER 2 Sheets-Sheet 2 Filed June 26, 1954 1? e-l n z I 2,

INVENTQR'. WILLIAM PnnsoNnG: Evans Patented May 5, 1936 MEANS FOR. EXTRACTING WATER. mom WEBS F PULP on PAPER William Parsonage Evans, Swinton, England Application June 26, 1934, Serial No. 732,426 In Great Britain June 26, 1933 6 Claims. (01. 9252) tracting purposes, use-is made of a substantially closed suction box structure approximately the width of the web and this has spaced lateral apertures and there co-operates therewith one These improvements are concerned with paper-making machines, or machines for drying paper, fabrics, or it might be other materials, but they relate primarily to an improved method of and means for extracting water from the paper web carried upon the wire in paper-making machines, and whereby I am enabled to obtain a better drying effect in a simple manner and with less wear and tear upon the wire and other parts.

It is known to support the wire" in paper making machines upon endless laterally corrugated belts and to extract the water by side suction devices across the mouths of which the edges of the endless laterally corrugated belts travel. It is also known to use a laterally corrugated endless belt to support the wire, and to close the corrugations at the extremities by endless moving side bands, the laterally corrugated endless belt co-operating with an open topped suction box or boxes in which a further endless band operates, there being a series of holes in the laterally corrugated endless belt leading into the suction box or boxes. In such schemes, as the latter, where holes in the laterally corrugated belt led to the suction box, considerable disadvantages followed, in so much, that a liquid seal was requisite to the open topped suction box, a number of endless bands were required, and the atmospheric pressure upon the endless laterally corrugated belt was considerable and extended over the entire area passing over the open topped suction box or boxes, and which was necessarily a very appreciable area.

An open-topped suction box the full width of the endless belt is subjected to considerable atmospheric pressure over the functioning area, whilst with smaller open-topped suction boxes 0 the drainage holes in the corrugated endless belt are local in effect to the size of suction box and can only be effective over a limited area. Likewise the smaller open topped suction boxes do not afford adequate support to the travelling corrugated endless belt.

My invention has to do with an improved meth- 0d and means which mark a considerable advance in the state of the art, in so much that I follow an improved method and means which overcome the difiiculties hitherto encountered, in trying to effectively drain water from a paper web or the like carried on a wire supported by an endless belt which is adapted to be drained.

According to myimproved method of extract- 5 ing water from the paper web supported on the wire in paper machines, and for like water exendless belt having lateral channels, belt drainage holes, and solid selvedges, and the improved method is distinguished by this, that, said belt and what it supports is only subjected to atmospheric pressure immediately over those nar row areas where the belt drainage holes pass over the apertures in the substantially closed surface of the suction box structure.

of the suction box structu Further the top re, being a substantially fiat and closed surface, it affords admirable support to the under face of the one endless belt,

and d'niiculties of sealing of structure are overcome.

belt to the suctionbox Further, the substantially flat belt supporting face of the substantially closed-in suction box is perforated, or it might be ribbed, to permit air to pass over areas between belt and suction box structure, and the suction box structure may be fashioned as to its upper surface to assist the getting rid of silt.

Also the substantially closed suction box structure enables me to conduct the paper web, wire,

and endless revolvable belt in substantially a uniform plane and to resist any tendency to sag into the known open-topped suction box over an appreciable area, which is an obvious drawback entailing considerable power to effect driving and resulting in much wear and tear.

The means which enable me to operate according to the improved method, include a single endless belt with blank or solid selvedges -which close the lateral channels, and a practically flat suction box structure in onc or more parts and substantially closed save for the lateral apertures, slots, or holes, and which suction box structure affords adequate support to the said single endless belt which only requires to submit to atmospheric pressure over very narrow and well distributed lateral areas.

The improvements are illustrated in the accompanying drawings, wherein:-

Fig. l is a broken end elevation showing a typical example of the improvements in connection with the wire of a paper making machine.

Fig. 2 shows a plan of Fig. 1 and clearly indicates the one endless belt broken away, and also one construction of the substantially closed Fig. 2.

belt and suction box Fig. 2.

tion on the line 2--2,

Fig. 5 indicates a portion of a modified endless belt with solid, blank, or closed selvedges, and in which the channels, which are there shown in plan, are sinuous.

Figs. 6 and? are views which show that deckle straps adjustably carried may be used to limit the eflective width of the one endless support belt.

Fig. 8 is a sectional view showing the suction box structure and the endless revolvable channelled belt in several modified forms.

Fig. 9 is a section of a modified revolvable support belt taken on the line 3-4, Fig. 8.

Fig. 10 is a section of a modified revolvable support belt taken on the linel-l, Fig. 8.

Fig. 11 is a plan of the suction box structure.

The improvements are illustrated by the Figs.

. 1 and 2 as applied in connection with the "wire of a paper making machine, which wire is marked a, and this wire in addition to passing over the known sustaining means receives support from a single revolvable endless belt such as b. This belt may be made from any suitable material or materials, as for instance it may be a rubber or rubber-covered belt, but in any case is fashioned with channels such as b which are close-pitched and have a lateral disposition. The channels may be straight or sinuous, as indicated by the Fig. 2 and. Fig. 5. These channels b have belt draining holes I) which are widely arranged laterally of the belt but extend, in pitched relationship, across the full width of the belt. The belt has a solid. blank, or closed selvedge b along each edge, that is, the channels b do not extend the full width of the belt so that water passing into the channels I) can only drain through the aligned and spaced drainage holes D The endles belt b is carried upon support rollers c, c, which may be free to revolve, or it may be driven and there may he means for tensioning the endless belt b. Also means for checking unupper stretch of the belt contacting therewith. I

Said suction x is substantially a closed vessel, save for lateral apertures or slots :1 at pitched or spaced intervals across the. full width of said suction box and which slots d 'coincide with the belt drainage holes I); or alternatively. I may provides a'series of holes (1 (see Figs. 8 and 11) The suction box :1 is exhausted through the pipes d 11 which lead into a common pipe (1* upon which the pump or the like acts, and the suction from the pump thus'serves to produce a suction effect upon the several sets of the lateral apertures or slots (1 or the holes (1 As a consequence, water from the wire a enters the channels b, and is well and evenly distributed over the width of the belt, and, as the belt drain- .age holes b pass overthe lateral slots d or holes d, sothe water is sucked into the substantially closed suction box and drained out along the pipes d (1 and d. If Figs. 4 and 8 are examined, it will be seen, how the water is drawn from the channels I) in the endless travelling belt b. It will be'also be seen that suction is only exercised upon the well and proportionately distributed areas represented by the spaced lateral slots 11 or holes 11, and consequently the wire and drive the belt. Further with my proportionately distributed linable drainage holes b moving over the narrow and correspondingly spaced lateral apertures, slots, or holes,in the otherwise closed suction box structure there results a'better distributed drainage effect with lessened liability for local water accumulation to occur.

In'order to prevent trapping of air or to facilitate the passage of air between the endless belt b and substantially closed suction box d, a series of holes 1 are provided through the upper wall of said suction box 11 over which the one endless belt travels. Also, to get rid of silt, or the like, below the said endless belt b I may provide'other apertures e which serve to scrape away such silt and permit same to travel" through and to fall clear of the suction box structure d (see Figs. 2 and 3).

' The solid, blank. or closed selvedges b define the limits of the channels b, and the belt drainage holes b come in succession into register with the lateral slots d or holes.d ,as the belt I) and wire a travel over the top of the substantially closed suction box d, and so one belt and a supporting suction box structure (closed save where the spaced ranks of belt drainage holes I; register) sumces. for the service required.

The Figs. 8, 9 and 10 suggest slight variations in the structure of the belt b. According to the Fig. 9 and left-hand portion of Fig. 8 on the line 3-3, the upper face of the belt has a covering 7) of pervious or open cotton felt or wire gauze, or

both, in addition to the grooves b and belt drainage outlet holes b the belt necessarily having solid selvedges b In Fig. 10 and the right-hand half of Fig. 8 on the line 44, the belt has a complete layer.or thickness of perviou's or open cotton felt or the like b the edge strips or lengths b of which are treated with rubber. and firmly adhered to the selvedges of the belt I). In both these examples the grooves b laterally of the endless belt b have drainage holes b An important feature of my method is that the suction box is in effect a continuous closed structure over which the one belt passes and which belt is only subjected to atmospheric pressure over well distributed comparatively very narrow lateral areas, and that with the air relief.

holes f and silt removal apertures e in the u per wall of the suction box there is no tendency to set up any vacuum effect between the inside face -of the belt and the support face of the suction aosasoe iect may vary as between the several substantially closed suction boxes.

I claim:

it Means for carrying out the improved method of extracting water from paper webs, comprising an endless flexible revolvable belt, laterally extending channels therein having drainage holes and closed selvedges, all inherent in said belt, said belt being adapted to support the wire and web, a suction bonwherewith the belt cooperates and having laterally spaced apertures in its upper surface but being: otherwise closed, means to admit air between said belt and said suction box structure, and revolvable means to support the belt, ml whereby the disadvantages of unbalanced atmospheric pressure is overcome and the suction effect on the belt and what it supports only occurs where the belt passes over the lateral tures in the suction box for the purposes cans for carrying out the improved method 7 cting water from paper webs, comprising an entrees flexible revolvable belt structure with laterally extending channels therein having" drainage holes, said belt having solid selvedges support the wire and web, and a type, a suction cor: having alternate channels and ribs on its upper face, said channels having free counication with the atmosphere and the ribs between the channels having suction ports leading from their upper edges to the intericr"oi the box, and an endless belt for supportingt'hewire belt of the machine having an upper run resting on said ribs, said endless belt having upstanding flanges at its edges, and provided with closely spaced, channels extel'lding between said flanges, said channels having suction ports in their bottoms passing successively over the sucstructure and the top oi said otherwise closed to said belt, drains holes from the channels in said endless revolvable belt, said'drainage holes adapted to progressively coincide with the spaced lateral apertures in the support face of said substantially closed suction box, means to permit free access of air between the inner face of the upper stretch of endless revolvable belt and the substantially closed top of the suction box, means to assist removal of silt between said endless revolvable belt and the substantially closed top of the suction box, means for supporting and permitting rotation of said endless revolvable belt and means for draining said substantially closed suction box.

5. Means for efiecting extraction or drainage of water from a travelling web of paper or other .material supported upon a wire, or otherwise,

and consisting of an endless revoivable belt with lateral channels in said belt, closed selvedges to said belt, drainage holes from" the channels in said belt, said drainage holes adapted to coincide with distributed lateral apertures in the support face of a substantially closed suction box, means to permit access of air between the lower face oi the endless revolvable belt and the substantially closed top of the suction box, means to assist removal of silt, means to support and per mit rotation of said endless revolvable belt,, means to supply water to the edgesoi said belt, and drainage provision to permit suction drainage of said substantially closed suction box.

6. Means for effecting extraction or drainage of water from a travelling web of paper or other material supported upon a "wire, or otherwise, comprising a substantially closed suction box structure with support face and lateral apertures in spaced relationship in said support face, a single endless revolvable belt, lateral channels in said belt, closed selvedges closing said channels at the ends, drainage holes in spaced relationship from the channels in said belt adapted to coincide with the lateral apertures in spaced relationship in the support face of the substantially closed suction box structure, outlet holes to perunit access of air between the inner face of said endless revolvable belt and top of said substantially closed suction box structure, means to asslot removal of silt, rollers to support and permit rotation of said endless belt, means to supply water to the edges of said endless belt, and suc-- tion pipe provision to said substantially closed suction box.

- l PARSONAGE EVANS.