US1438211A

US1438211A - Paper-making machine

Info

Publication number: US1438211A
Application number: US501250A
Authority: US
Inventors: Baetz Henry
Original assignee: SKINNER BROS Manufacturing CO
Current assignee: SKINNER BROS Manufacturing Co
Priority date: 1921-09-17
Filing date: 1921-09-17
Publication date: 1922-12-12
Anticipated expiration: 1939-12-12

Description

H. BAETZ.

PAPER MAKING MACHINE APPLICATION FILED SEPT. 17, 1921.

Patented Dec. 12, 1922.

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APPLICATION FILED SEPT. 17, 192i.

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UNHTED stares HENRY BAETZ, OF ST. LOUIS, MISSOURI, ASSIGNOR TO SKINNER BROS. MFG. ('30., OF ST. LOUIS, MISSOURI, A. CORPORATION OF MISSOURI.

PAPER-MAKING MACHINE.

Application filed September 17, 1921 Serial No. 501,250.

To all whom. it may concern."

Be it known that I, HENRY BAETZ, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Paper-Making Machines, of which the following is a specification.

My invention has relation to improvements in paper-making machines, and is particularly directed to the drying rolls of a machine of the continuous web type. As is well understood in the art, paper-making machines of this type consists in a sieve of endless wire cloth carried on rollers, onto which the pulp is run and carried to a dandy roll which determines the character of the paper. The web is then passed through rolls where the water is squeezed out, after which it passes over the driers which consist of rolls or hollow cylinders heated with steam. It is in connection with these drying rolls that my invention is utilized, to expedite the drying operation. The invention consists specifically in the application to the paper web of suitable nozzles for discharging heated air against the surface of the web so as to assist in the vaporization of the moisture and at the same time maintaining'the atmosphere in the vicinity of the web in a comparative state of dryness. These objects together with other advantages will be better apparent from a detailed description of the invention in connection with the accompanying drawings, in which- Figure 1 is a cross-section through the drying rolls showing m invention applied thereto; Fig. 2 is a dlagrammatic view of the drying rolls'with myinvention installed for operation in connection therewith; Fig. 3 is an enlarged endviewof three drying rolls over which the paper web is passed showing the disposition of the air conduit and nozzles so as to discharge the heated air diagonally against the web; Fig. 4 is a ver-' tical transverse section taken on the line 44 of Fig. 3; Fig. 5 is a side elevation of the supply pipes and nozzles with part broken away and looking in the direction of the arrow (Fig. 3) Fig. 6 is a cross-section through one of the nozzles, taken on the line 6-6 of Fig. 4.

Referring to the drawings, 1 and 1 represent the upper and lower drying rolls re spectively supported in a skeleton frame F, said rolls having the web 2 passed around them. Idler rollers 3 are mounted beneath the upper rolls 1, and a felt web 4 is passed over the idlers 3 and under the rolls 1, and thence around idlers 3, at the ends of a certain number of rolls and idlers 3" beneath the idlers 3, the felt web thus constituting an endless belt. Asthe paper web 2 passes over the rolls 1', the felt web 4 likewise passes over said rolls, the paper web 2 however being betweenthe rolls and felt web 4. The felt web thus assists in tween the felt web 4, paper web 2 and upper' roll 1. Because of the presence of these pockets, the large amount of vapor and steam that is necessarily formed in the drying of the moist web is more or less occluded between the rolls and greatly retards the drying operation necessitating a greater number of rolls than would be necessary were this not the case. In order to overcome this disadvantage and thereby obtain the same drying efficiency with a less number of drying rolls I provide a branched air conduit 6 arranged beneath each of the upper rolls 1, the branches 6', 6 of each of said conduits being provided with a plu rality (three in the present case) of supply p'ipes 7 7, 7 terminating in

nozzles

8, 8, 8", he nozzles being located in the pocket 5 and extending substantially one-third the width of the web. Of course, there may be any number of supply pipes and nozzles, and the nozzles will collectively cover the entire width of web. By referring to Fig. 5 it will be seen that the nozzles are provided with discharge openings or slots 0, 0, 0 respectively, and these slots extend throughout the entire length of the nozzle, the first slot being adapted to dischargeheated air against one-third the width of the web, the next slot taking up where the first ends, and the last covering the last third, so that the entire width of the web receives a stream of heated air. The nozzles are disposed diagonally with relation to the plane of travel of the web, or what is the same thing, inclined to the axis of the rolls, and at the same time curved, the walls of each nozzle being tancf thus disposing and shaping the nozzles ore:

Firstly, by mah'ng the walls of the nozzle II to keep moving in \a straight line and thereby impinge with considerable velocity onthe outer arcuate wall of the nozzle. It is in one of the side walls at its intersection with this outer wall that the slot is located so that as the stream of hot air impinges on this outer wall it is immediately forced out throughthe slot by the combined forces of its own velocity and inertia. N ow, in addition to being curved, the nozzle tapers down to a smaller size gradually toward the end so that as the air discharges through the slot and the volume is diminished, the pressure will be maintained so that the stream of air will discharge from the entire slot opening with practically equal force.

Secondly, the diagonal disposition of the discharge slot causes a given'point in the paper web to travel past the slot on a diagonal, and therefore remain in the stream of hot air issuing from the slot for a longer period than it said point passed the slot at right angles. This is self evident since the diagonal of a rectangle is longer than a side. Therefore all the points in the web that pass I the discharge slot will remain longer in the drying medium than they would if the passed the slot at right angles. Since a the nozzles are inclined or diagonally disposed, the entire web will secure the benefit of this longer contact with the stream'of hot air, thus increasing the drying efiect for a given speed of travel of the web and a given width of discharge slot.

In the present instance the supply pipes 7, 7', 7" are contiguous to each other, and the first two have a common wall a, and the last 'tWo .a common wall 5. Valves 9, 9' are mounted in thebranchesb', 6". at the intake end of the supply pipes 7, 7', 7",

7 said valves when entirel open forming a iv tions (shown amount on an continuation ofthe partition walls a, b. The

valvesfi '9 may he s to various posi nozzles" can' be controlled so as to direct any part of the web. The conduits 6 receive the heated air V i from a header H which is in counication I with the hot air chber C of a heater .10

to which the air supply is conducted by an intake pipe 11.

Y The drying operation is further facili- I tated by providing transversely disposed dotted Fig. 5) so as to close iofianyone or two of the supplylpipes or H tof regulate the amount of air entering them. 'f gInthisiway the air discharging from the inseam side of the lower i or the air wet a,

Having described my invention, I claim:

1. In a paper-drying machine provided with upper and lower drying rolls between and around which the paper web is adapted to travel, a series of conduits arranged at one side of the rolls, each conduit terminating in a nozzle provided with a discharge opening arranged to discharge a drying medium against the web in a stream adapted to impinge on the web on a diagonal in the plane of said web, and a source of supply for said conduits.

2. In a paper-drying machine provided with upper and lower drying rolls between and around which the to travel, a series of a r conduits arranged at one side of the rolls, each conduit terminating in a nozzle provided with an airdischar e slot disposed in parallelism and diagonadly with relation to the web, and a source of air supply for said conduits.

3. In a paper-drying machine provided with upper anddower series of drying rolls between and around which the paper web is adapted to travel, a series of air conduits arranged at one side ofthe rolls, each of said conduits terminating in an arcuate nozzle having a discharge slot in one wall, and a source of air supply for said conduits.

paper web. is adapted j d. In a paper-drying machine provided with upper and lower series of drying rolls between and around which the paper web is adapted to travel, a series of air conduits arranged atone side of the rolls, .eachof said conduits terminatin in a plurality of said nozzles having an air-discharge slot disposed diagonally with relation to the web and adapted to discharge heated air against a portion'ofthe width of the web, and a source ofair supply for the conduits.

5-. In a -paper-drying machine provided withan upper and a pair of lower drying rolls around which the paper web is adapted to travel, thereby forming a pocket between said lower rolls, an 'air conduit disposed at the end of the rolls, said conduit being provided with a plurality of discharge noz? zles located in the pocket, each nozzle being provided with a discharge slot adapted to discharge heated air diagonally against the Web and again t a portion of the width at neeaaii the web, the slots collectively discharging air against the entire width of web, and a source of air supply for the conduit.

'6. In a paper-drying machine provided with an upper and a pair of lower drying "rolls around which the paper web is adapted to travel, thereby forming a pocket between said lower rolls, an air conduit disposed at the end of the rolls, said conduit being provided with a plurality of discharge nozzles, supply pipes connecting said nozzles to conduit, each of said nozzles being arcuate, and tangential with relation to the supply pipes, and having a discharge slot in one wall adapted to discharge heated air against the web and over a part of its width the nozzles collectively discharging air over the entire width of web, and a source of air supply for the conduit.

7. In a paper-drying machine provided with upper and lower series of drying rolls between and around which the paper web is adapted to travel, a series of air conduits arranged at one side of the rolls, each of said conduits terminating in a plurality of Valve controlled supply plpes provided with f position of said stream being perpendicular and diagonal to the direction of travel of said surface.

In testimony whereof I hereunto afiix my signature.

,l HENRY BAETZ.