|Publication number||US2333629 A|
|Publication date||Nov 9, 1943|
|Filing date||Jul 14, 1941|
|Priority date||Jul 14, 1941|
|Publication number||US 2333629 A, US 2333629A, US-A-2333629, US2333629 A, US2333629A|
|Inventors||Beadle Sr Warren E|
|Original Assignee||Cons Water Power And Paper Com|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (17), Classifications (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Nov. 9, 1943. w. E. BEADLE, sl-'e4 2,333,629
COATING' PROCESS Filed July 14, 1941 Patented Nov. 9, -1943 COATING PROCESS Warren E. Beadle, Sr., Wisconsin Rapids, Wis., assignor to Consolidated Water Power and Paper Company, Wisconsin Rapids, Wis., a corporation of Wisconsin Application July 14, 1941, Serial No. 402,302
This invention relates to improvements in a process of coating paper or other flexible brous webs to impart thereto a smooth, uniform surface suitable for the reception of fine printing, and a machine for carrying out said process.
In the coating of paper, fibrous board or the like, to impart thereto a surface which partakes of the characteristics of the coating material rather than those of the base brous web, the
desideratum is to produce a surface which is uniform in texture, smooth and one which will not be lifted from the web during calendering or printing orsubsequent operations.
Brieiiy described, my. invention comprises passing a fibrous web forwardly in step with the formation of the web on a paper machine, or as a separate operation apart from the paper machine; bringing a surface of said web into contact with a rotating surface having a peripheral speed slower than the translatory speed of the web, the rotating surface being adapted to deposit coating material upon the surface of the web with a wiping and smoothing action; performing the same operation on the opposite side of the web, and while the coating material is still in a mobile state, passing the web between two opposed rotating pressure surfaces. Air, preferably heated, is then blown upon the coated surfaces to preliminarily set the coating and subsequently the web is passed over drum driers to fully dry the coated surfaces.
The objects and advantages of my invention will be apparent from the accompanying drawing and following detailed description.
In the drawing, the single figure is a diagrammatic view of suitable apparatus for carrying out my invention.
Referring in detail to the drawing, I and 2 indicate the final two drier drums o f a battery of drier drums which constitute the dry end of the usual paper machine. ried through the dry end of the paper machine and passes around drums I and 2. After passing from drum 2 the web 3 is substantially dry in the sense that the term is used in the paper making art. that is, it contains less than percent moisture. If desired, after leaving drum 2, the web may be passed through the usual machine calender (not` shown) or the web may be passed directly from the dry end to my coater 4.
The coating unit 4I comprises frames 5 and Ii, which when joined together, as shown, form substantially an A-frame. A secondary framev 1 is positioned beneath the frame E and is substantially triangular in shape, said frame carry- A web of paper 3 is carv ing diagonally spaced bearings 8 and 9 which are adapted to carry, respectively, rolls I0 and II. A
pan I2 is also carried by the secondary frame 1 immediately beneath roll Ill, said pan being provided with a drain pipe I3 whereby coating material which is received by said pan may be removed.
Similarly, a secondary frame I4 is positioned beneath frame 5, said secondary frame I4 being offset upwardly with respect to secondary frame 1. Secondary frame I4 carries diagonally spaced bearingsjl5 and I6 which, respectively, support rolls Il and I8. A pan I9 is positioned on the secondary frame I4 immediately beneath roll I'I,
said pan being provided with a drain pipe 2l).
Rolls l0 and Il are preferably separately and independently driven by any suitable driving means (not shown) as are rollsI'I and I8. A header 2| is positioned above the nip of rolls I0 and I I and feeds a stream of coating material to said nip to form a pool therein. Similarly, a header 22 is positioned above the nip of rolls I'I and I8 to deliver coating to the nip of rolls i1 and I8.
The coating material employed may comprise a mineral suspension comprising a mineral pig"- ment such as satin white, blanc x, or any of the usual coating clays; an adhesive suchr as starch, caseinor the like, and a dia \ersing agent such as water soluble soaps. Of course, although my invention is particularly adaptable for coating paper or board for printing purposes ernploying a mineral suspension as the coating material, other coating materials are contemplated such as varnishes, resins, rubber latex coatings or the like, the feature of my invention residing in the fact that the coatings can bey applied in an extremely smooth and uniform manner.
Web 3 after leaving drum ,2 is trained around guide rolls 23 and 24 and passed tangentially into contact with the rotating surface of r'oll I I. Rolls I0 and II are substantially in contact with each other and are preferably driven at different peripheral speeds. The difference in peripheral speed of the two rolls controls, to a degree, the amount of coating material which will be carried l on the surface of roll II, and hence, the amount of coating material which will be transferred to webls coated. vThe relationship and function of rolls I1 and I6 is similar to that of rolls III and Ii, as has been hereinbefore described. It will be noted that roll Il is offset with regard to roll Il whereby the 'web is -wrapped a slight degree about each of the coating rolls thereby insuring adequate contact between the coating roll surfaces and the web.
As has been hereinbefore described, the peripheral speed of rolls Il and Il is less than the translatory speed of the web. 'I'his arrangement permitsy a wiping and smoothing action to take place which is conducive to a smooth and uniform resulting coated surface. Preferably, the solids content and viscosity of the coating material are relatively high so that the greatest advantage of the wiping an`d smoothing action may be secured.
Ihe web 3 after leaving roll I9 is passed between rolls 25 and 26. The coating material upon the opposite surfaces of the web during `passage of the web between the rolls 25 and 26, is in a mobile state and pressure is exerted upon the web by said rolls whereby the coating material is compacted and forced into the pores and interstices of the paper web.` An additional smoothing action is performed by the rolls 25 and 26 although said rolls have a peripheral speed substantially equal to the translatory speed of the web. Rolls 25 and 26 may be driven independently or may be geared together.
Roll 25 is mounted upon shaft 21 which, in turn, is journalled in bearing 29. Bearing 28 is mounted upon the upper portion of frame 5. A frame 29 is pivotally mounted as at 30 on frame 6. Roll 26 is carried upon shaft 3l which, in turn, is journalled in bearing 32 carried upon frame 29. A cylinder 33 carrying a lug 34 at its lower end is pivotally joined as at 35 to a support 36 mounted upon the floor. A piston rod 31 is slidably positioned within cylinder 33 and is pivotally connected as at 36 to frame 29. Means (not shown) is provided for introducing liquid under pressure into the cylinder 33 to move piston rod 31 inwardly or outwardly within the cylinder 33 to rock frame 29 about its pivotal mount 30.
A screw 39 is threadedly positioned in a portion of frame 29 and carries a capstan head 40. A nut 4I functions to lock screw 39 at a desired position with respect to frame 29. When the piston rod 31 moves upwardly, frame 29 is rocked in a clockwise direction until the head 40 contacts frame 6. It can readily be seen that the screw 39 thereby functions as a stop which determines the minimum degree of proximity between rolls 25 and 26. A pin 42 ismounted upon frame 6 and a pin 43 is mounted upon frame 29. A link 44 embraces both pins and functions to limit the counterclockwise movement of frame 29 with respect to frame 6. It can readily be seen that by the provision of the pneumatic forcing means a headers 41 and 48 respectively. The chests 45 7 and 46 are provided with suitable perforations whereby the web, in passing between the chests is bathed in air. The air discharged into contact with the coated surface of the web is preferably heated whereby a preliminary set is impartedto the coating carried upon the web surfaces. u
Subsequently the web 3 passes around drum 49 which isv preferably heated and is then carried around a plurality of conventional drier drums 50 and 5I to fully dry the coating. The web may then be calendex'ed or super-calendered and rolled or sheeted.
,It can readily be seen that herein is a process for forming a uniform and smooth surface of coating material upon the surfaces of a continuously passing web, the process being characterized by the fact that the coating material is applied by rotating surfaces which rotate in contact with the web surfaces and have peripheral speeds which are less than the translatory speed of the web. To compact and force the coating material into thepores and interstices of the fibres constituting the web, pressure is applied to the opposite surfaces of the web. Simplicity and speed, together with smooth and uniform coated surfaces feature my invention.
I claim as my invention:
1. A method of coating a continuously advancing relatively flexible fibrous web which comprises, depositing a controlled amount of mobile coating material upon a rotating surface, rotating said surface in contact with an unsupported surface of said web and in the same direction of movement with said web and at a speed less than the translatory speed of said web to apply a coating to said web surface with a wiping action, and subsequently passing said web between opposed pressure surfaces while the coating material upon the web is in a mobile state to only thereafter compact said coating material upon said web surface, and drying said coated surface.
2. A method of coating a continuously advancing relatively flexible fibrous web in substantially dry condition'which comprises, depositing a controlled amount of mobile coating material upon a rotating surface, rotating said surface in contact with an unsupported surface of said web and in the same direction of movement with said web. and at a speed less than the translatory speed of said web to apply a coating to said web surface with a wiping action While causing the web to be wrapped a slight degree about said rotating surface, and subsequently passing said web between opposed pressure surfaces while the coating material upon the web is in a mobile state to only thereafter compact said coating material upon said web surface, and drying said coated surface. Y
3. A method of coating a continuously advancing relatively flexible fibrous web which comprises, depositing a controlled amount of mobile coating material upon a rotating surface, rotating said surface in contact with a surface of said web and in the same direction of movement with said web and at a speed less than the trans1a tory speed of said web to apply a coating to said web surface with a wiping action, depositing a controlled amount of mobile coating material upon a second rotating surface, rotating said second rotating surfacein contact with the opposite surface of said web at a speed less than the translatory speed of said web to apply a coating to said web with a wiping action after the first coating has beenapplied, and subsequently passing said web between opposed pressure surfaces while the coating material upon the web is in a mobile state to only thereafter compact said coating material upon said web surfaces, and drying said coated surfaces.
asssae 3 4. A method of coating a continuously advancing relatively flexible substantially dry fibrous web which comprises, passing said web upwardly in a substantially vertical direction, depositing a controlled amount oi mobile mineral coating material upon a rotating surface, rotating said surface in contact with a surface of said web and in the same direction of movement with said web and at a speed relatively less -than the translatory speed of said web to apply a coating to said web surface with a wiping action, and subsequently passing said web substantially vertically upwardly between opposed pressure surfaces while the coating material upon the web is in a mobile state to only thereafter compact said coating material upon said web surface, and drying said coated surface.
y WARREN E. BEADLE, SR.
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|U.S. Classification||427/364, 118/220, 427/372.2, 427/397.7, 118/224, 118/117|
|Cooperative Classification||D21H5/0032, D21H23/58|
|European Classification||D21H23/58, D21H5/00C10D2|