US2018382A

US2018382A - Art of ply paper or board manufacture

Info

Publication number: US2018382A
Application number: US749839A
Authority: US
Inventors: John W Sale
Original assignee: HUMMEL ROSS FIBRE CORP
Current assignee: HUMMEL ROSS FIBRE CORP; HUMMEL-ROSS FIBRE Corp
Priority date: 1934-10-24
Filing date: 1934-10-24
Publication date: 1935-10-22
Anticipated expiration: 1952-10-22

Description

Oct. 22, 1935.

Filed Oct. 24, 1954 5 Sheets-Sheet 1 Oct. 22, 1935.- J. w. SALE 2,018,382

ART OF PLY PAPER OR BOARD MANUFACTURE Filed Oct. 24, 1954 3 Sheets-Sheet 2 0a. 22, 1935. I J, w SALE 2,018,382

I ART OF FLY PAPER OR BOARD MANUFACTURE Filed Oct. 24, 1954 5 Sheets-Sheet s Patented Oct. 22 1935 ART OF PLY PAPER OR BOARD MANUFACTURE John W. Sale, Hopewell, Va., assignmto Hummel- -Ross Fibre Corporation, Hopewell,- Va., a corporation of Virginia Application October 2 4, 1934, Serial No. 149,839

8 Claims. (01. 92-44) REISSUED m A general object of the present invention is to the ultimate P duct wh ch are desired when the 10 render it possibie' to manufacture the afore-- finished product is to be d in'corru ating or mentioned type of paper or the like on a Fourpasting machines, t e lower or base sheet in the drinier type of machine,thereby being able to Present P having less S permitting of greatly increase speed of manufacture with a requicker ng of Silicate adhesive.

suiting increase in production. In practicing my Another p cific Object ofrthe invention is to 15 method I form the usual web of sheet of paper provide a emls S eet of known fiber conor board in the regular manner on a Fourdrinier tent having a more v surface than Was D ife belt and uperpose on this regular web Qr sible Of attainment heretofore, with the result Sheet angther Sheet made from t same that there can be a substantial reduction in the terials and of th same color, or from djfiepent amount of surface or sizing materials over that 20 materials and of different colors, in such manrequired in standard P ac ce for the attainment ner as to, first, improve the formation and texture of a high finish h the elimination of hills and of the sheet and give it greater tensile strength Valleysboth with and across the grain; secondly, to pro- A further specific ject O the invention is to vide a more uniform ionnation, improve the Mulprovide on aFourdrimer im of m hine, a homolen test and the finish or surface characteristics geneeus sheet of certain known fiber content and produce a much more uniform and highly with Varying amounts of steek y atio t us polished surface without the aid of starch, wax, Obtaining r better yin q alities than are or other ingredients used as a surface coating on regularly obtained on & uld e machine, the

some types of board; and thirdly, to obtain greatadvantageous result being p c y oticeable 30 or bulking, th resulting in 1ower weight per where the bottom stock or the base sheet is of a unit area for a given thickness of paper or board. greater degree of freeness than the liner. ck

My invention further eliminates certain disadsupplemental sheet which permits ter drivvantages which heretofore have been inherent in mg, to the end that the Production is reatly 3d t Fourdrimer type of machine, in t t first my increased Still another specific object of the ininvention enables the paper maker to control the Vehtion is Produce a homogeneous heet of sizing or absorbency on one or both sides of the known fiber t,w chinthe finished P t sheet especially for use by the manufacturer of will have surfaces susceptible of readily e e corrugated or solidfiber shipping cases, as it eningeolol'ing mate iel. s

40 ables the box maker to get quicker and more uni- These and other cts a d advantages will 40 form adhesion in pasting the board; secondly, the apparent from the following detailed pelimination of danger of splitting, blowing or 171011- I checking frequently found in board made on cyl- Clea? conceptlon of the Steps constituting the inder machines, as more fully hereinafter .Set present.1mprveq method and of the improved forth v mechanisig forming part of the present invention A specific object of the invention is to provide and i W h the method commercially n a Fourdrinier type of machine, a homogeneous FXDImted may had by referring to the draw" sheet of certain or known fiber content with a g g i part of this maximum amount of dilution, thus obtaining far :2 1 fif refegsnsge glans-tars 50 better sheet finish than is regularly obtained on s e e S e or 5 ar pa m a ylinder machine, the advantageous result be- Fig. 1 is a longitudinal vertical sectional view. mg pecially noticeable where ,the bottom stock of the main parts of th forming end of a Four; is of a greater degree of freeness than the liner drinjer hi of 11 known typestock which allows the use of increased volu This invention relates to improvements in the art of ply paper or board manufacture. Y

' In the manufacture of paper board, liners, and various grades of built-upvat-lined combination ply board, it has heretofore been necessary to use a single cylinder 01' multi-cylinder rotary machine. This type of machine has a number of serious disadvantages which are well known to those skilled in this art.

or water in the formation, to the end that the formation is greatly aided;

A further specific object of the invention is to lay down a homogeneous sheet of known fiber content with varying amounts of sizing mate-tv rials in each face, thereby eliminating a substantial amount of sizing material on the bottom face, resulting in a considerable saving in sizing ma- V terial cost, and also increasing the qualities-of F gs, 2, -3 and 4 are respectively vertical sec- Fig. 5 is a vertical transverse sectional view of the preferred form of headbox, such as shown in Fig. 1; v 7

Figs. 6 and 7 are detailed views of adjusting devices hereinafter described;

Fig. 8 is a side elevation of the rear, delivery side of the supplemental head-box;

Figs. 9 and 10 are detail views of the shaker mechanism for the supplemental head-box; and

Fig. 11 is a detail view showing the manner in which the deposit plate may be flexed transversely for the purpose hereinafter set forth.

Referring to the drawings annexed by reference characters, l0 designates the usual main head-box of a Fourdrinier, which head-box is provided with the usual devices for delivering" to the wire belt H the usual highly diluted water laid sheet, the usual table rolls l2 being employed to support the wire upon its rearward movement through the machine.

At any suitable point along the length of the rearwardly moving wire, I mount a supplemental head-box designated generally by the numeral I3, this head-box being suspended at a. desirable point above the wire by means of vertical hanger bolts l4, two being used at each end of the headbox, and their upper ends being adjustably connected to a frame consisting mainly of a pairof I-beams I5. In this manner of supporting the head-box, it will be noted that it may be readily;

adjusted vertically and in addition may be more or less tilted towardone side or the other, aswell as tilted fore and aft of the machine. This universal suspension of the supplemental head-box may be obtained in any suitable manner. I illustrate a simple way, namely, by threading handoperable nuts l6 on the upper ends of the hanger bolts I l.

' The stock is supplied to the superposed or supplemental head-box by means of valved vertical pipes l1 which have a common connection to a supply pipe I8, the lower ends of these vertical pipes I I being arranged to loosely telescope into upturned elbows I9 .whose lower ends empty into the chest I 3 through the front wall thereof. By thus connecting the stock supply conduits with the supplemental chest, it will be seen that the chest will have a wide range of adjustment up and down and a sufflcient range of transverse, as well as longitudinal, tilting to permit of all the adjustments desirable in properly depositing the supplemental top or liner sheet upon the base sheet.

The interior of the chest I3 is. provided with suitable baffles 20 which extend from one end wall of the chest to the other end wall at points between the closed front wall of the chest and the open back wall thereof. One of these back walls depends from the top of the chest to a. point near the bottom thereof, and the other two rise from the bottom of. the chest, one of these latter baffles being arranged at the rear delivery side of the chest in such a position that the outgoing stock flows over its top edge. These baiiles within the chest serve to not only assist in mixing the fibers with the water that carries them, but also destroy tendency to turbulency in the chest, and thus insure a smooth, quiet delivery of the stock outwardly over the top edge of the rearmost one of the baiiies.

Projecting rearwardly from the rear, delivery side of the chest I 3 is a deposit plate 2|, whose forward edge is rigidly attached to the chest, and

whose rear, delivery edge is free. This deposit plate 2| extends from one end to the other of the chest and is horizontally arranged so that the highly diluted stock may fiow quietly off its rear, delivery edge onto the base sheet on the wire.

To regulate the depth or'thickness of the out-. 5 flowing stream, I provide a vertically adjustable sluice or gate 22, mounted to slide vertically on the rearwardly extended end walls of the chest, this vertical adjustment being accomplished by screws 23 and hand-nuts or wheels 24. This gate 22, together with the plate 2| and the adjacent bafile 20, forms a pool at the rear delivery end of the chest to thus further insure against agitation of the liquid stock, the quiet flow of the hydrated stock onto the base sheet being highly desirable 15 in order to avoid rippling of the upper surface of the composite sheet. To still further quiet the liquid stock in the pool, I arrange therein a depending bafiie 25. This is adjustably supported by screws 26 and hand-nuts 21 on the aforesaid rear- 20 wardly extended walls of the chest. In the construction above described, it will be seen that no matter how highly diluted the stock in the supplemental chest may be, I may deliver it in a quiet, even flow onto the base sheet. This is important 3 for the reason that in carrying out my method, it is highly desirable that the stock for producing the liner or top layer shall be highly diluted, and that the delivery of this highly diluted stock shall be made in such a manner as not to disturb the 30 watery condition of the'upper surface of the base sheet.

I have discovered that by making the deposit plate- 2| of thin, elastic metal, I may utilize this plate for insuring a uniform, even thickness of 35 the finished paper or board. I have found that by providing means for flexing the delivery edge of the plate at a plurality of points across the machine, I may deliver varying quantities of the stock at points wherever needed across the base 40 sheet, and thus correct any flaws in the finished sheet. In practice, by calipering the finished sheet in the usual manner, I ascertain at what points across the sheet more or less stock is needed and then make the flexing adjustments of the plate accordingly. In the present instance, the means for flexing the sheets at sep-' arated points consists of vertical rods 28 attached rigidly at their lower ends to the plate 21, and having their upper ends threaded and provided 50 with hand-operable nut wheels 29. Each one of these adjustment devices is operable independently of the others, so the plate may be more or less flexed at different points along its length. The sluice or gate 22 is desirably, made in two 55 sections which may overlap each other midway the width of the machine, as shown in Fig. 8, to thus enable this sluice orgate to be properly adjusted on the side walls of the chest. It is desirable, when'this overlapped sluice is used,

to provide the overlapped ends with adjusting devices 30 to insure proper alignment of the sections.

All Fourdrinier machines are provided with means for edgewisely shaking the wire after it leaves the breast-roll at the forming end of the machine to thus insure interlockingof the fibers in the sheet. I may arrange to lay the supplemental sheet upon the basesheet without laterally shaking the supplemental chest, in which case the fibers of the supplemental sheet lie approximately parallel with each other when they are bonded to the base sheet, and thus give to the finished composite sheet the highest possible degree of stiifness. On the other hand, I may be laterally shaken during the delivery operation to thus laterally agitate the fibers of the supplemental sheet and criss-cross ,them with respect to the fibers of the base sheet. and thus not only increase the homogeneous structure of the finished sheet but also give to it a flexibilty that is desirable in many cases. To thus provide for shaking the supplemental box endwisely, I mount its supporting frame I upon a pair'of upstand ing,supporting pivotal links 3| and connect one homogeneous and not subject to peeling or separation under flexure. This complete bonding of superposed sheets has never heretofore been accompished even in the cylinder machines now in general use in the manufacture of this type of board. I accomplish this very important'result by providing means for setting the fibers in the underside of the base sheet and leaving the upper face of the base sheet in a sufficiently watery condition to insure its fibers intimately interlocking with the fibers of the supplemental sheet when it is land down onto the watery face of the under sheet. In the present illustration of my apparatus, I show three

suctionboxes

34, 35, 36 for accomplishing this purpose, these suction boxes being arranged underthe wire' and being constructed in the usual manner and subjected to the vacuum suction in the usual way, not shown. Any one or all of these suction boxes, or even additional suction boxes, may be used for preliminarily setting the under side of the sheet. The amount of suction the sheet is subjected to depends on the nature of the board or paper being produced, as is obvious, it being important only that a sufiicient quantity of water in the base sheet shall be quickly extracted to set the fibers in the underside of the sheet and leavethe upper side of the sheet in as watery condition as possible to thus enable the water on the upper surface of the sheet to commingle with the water coming down with the supplemental sheet. It will be noted that one of these suction boxes, namely 36, is located directly underneath the delivery edge of the deposit plate 2|; this is desirable in order that the composite sheet shall Any number of the usual dandy-rolls 38 may of course be used for smoothing the upper surface both of the base sheet and the composite sheet.

In some cases, it may be desirable to fasten a flexible apron or sheeton the deposite plate and have it extend beyond the delivery edge thereof in order to still further prevent undesirable turbulency at that point. It-will be understood also that one or more additional supplemental chests may be employed if it be desired to produce a board having more than two plies. And 5 it will be noted also that in my process the plies may be made of the same furnish or of different characters; for instance, for carton and box board it will be desirable to have a base sheet of a more porous nature so as to give it a. better pasting surface, while the top layer may be made of such fibers that it will take a hard, smooth polish in the calenders. Also, in my process it is a'simple matter to color either one or both the plies.

, It is to be understood that where I refer to the under side of the sheet being set, I, mean that the fibers have assumed their final position with reference to each other, and that where I refer to the top side of the base sheet as being in a watery condition at the point where the supplemental sheet is laid down thereon, I mean that the fibers in the top side of the sheet have not yet assumed their final position but are still in a floating condition in the water.

In the modification shown in Fig. 2, I show an elevated chest '39 which may be employed for delivering the dehydrated stock to the chest l3 by means of a downwardly inclined board or trough 40.

In Fig. 3, I 'show the supply chest 39. directly connected with the supplemental chest l3 and arranged under it, one of the dandy-rolls 33. In Fig. 4, I show the elevated supplychest 39 projecting rearwardly so as to overhang the supplemental chest l3 and thus provide for a direct downward delivery of the stock into the chest I3. All these changes may be resorted to, and many others, without departing from the spirit of my invention.

I claim:

1. In the art of making ply paper or ply board or products of a similar nature on a traveling endless wire, continuously laying down a base sheet on the wire and continuously moving the same with the wire, partially dehydrating said base sheet as it travels, continuously delivering on the top side of said base sheet a highly diluted stream of paper stock at a point where the base sheet has become partially dehydrated,then 0 applying suction to the underside of the wire adjacent the point where the diluted top stream of stock is delivered to the base sheet, to first mix together adjacent portions of the stock of the top stream and the stock of the base sheet and then quickly dehydrate the composite sheet and draw down the fibers of the under part of the top stream into interlocking mixed relation with I the fibers of the upper portion of the base sheet to thus form a single homogeneous sheet, then further dehydrating the composite bonded sheet thus formed, and finally finishing the composite sheet in'a suitable manner.

2. In combination with a paper making machine of the Fourdrinier type, a supplemental stock chest mounted above the wire belt having means for delivering, a supplemental layer of stock upon the base sheet upon the wire and means whereby said supplemental stock chest may be vertically adjusted with respect to the wire.

3. The structure recited in claim 2, said adjusting means embodying devices whereby the supplemental stock chest' may be tilted transversely of the machine. I V

4. The structure recited in claim 2, said adjusting means embodying devices whereby the supplemental stock chest may be tilted fore and aft of the machine.

5. In combination with a paper making machine of the Fourdrinier type, a supplemental stock chest mounted above the wire belt'having means for delivering a supplemental layer of stock upon the base sheet upon the wire and means whereby said supplemental stock chest may be vertically adjusted with respect to the wire, a stock supply-pipe having a plurality or depending valved'branches, a corresponding plurality of upstanding inlet-pipes carried by the supplemental-chest, the adjacent ends of the two sets of pipeshaving free telescoping connections whereby the supplemental chest may be raised and lowered and tilted without disconnection from said valved branches of the delivery pipes.

6. In combination with a paper making machine of the" Fourdrinier type, a supplemental stock chest supported above the wire and having means for delivering a supplemental sheet ofbodying; a vertically adjustable gate above said delivery edge and a vertically adjustable baflle arranged between said gate and the outlet of the supplemental chest.

7. In combination with.v a paper making machine of the Fourdrlniertype, a supplemental stock chest supported above the wire and havin means for delivering asupplemental sheet of stock upon the base sheet on the wire, said means 5 embodying a substantially horizontal deposit plate projecting from thesupplemental stock chest in the direction of movement of the base sheet and having a delivery edge, means for forming a pool upon said deposit plate, and an upright plate at the delivery edge of said deposit plate for regulating the flow. between said feed edge and the lower edge of said upright plate on to the base sheet, said deposit plate being flexible transversely at its delivery edge and means being provided for flexing said delivery edge -at separated points across the machine.

8. In combination with a paper making machine of the Fourdrinier 'type, a supplemental stock chest supported above the wire and having 10 means for delivering a supplemental sheet of stock upon the base sheet on the wire, said means embodying a substantially horizontal deposit plate projecting from the supplemental stock chest in the direction of movement of the base sheet and having a delivery edge, means for forming a pool upon said deposit plate, and an upright plate at the delivery edge of said deposit plate for regulating the flow between said feed edge and the lower edge of said upright plate on to the base sheet, means being provided for transversely shaking the supplemental box during the delivery of the supplemental sheet of stock JOHN w. SALE.