US2981175A - Sheet caliper control device for paper making - Google Patents

Description

April 25, 1961 F. H. GOYETTE SHEET CALIPER CONTROL DEVICE FOR PAPER MAKING Filed Nov. 6, 1957 INVENTOR FRANCIS HENRY GOYETTE ATTORNEY SHEET CALIPER CONTROL DEVICE F PAPER MAKING Filed Nov. 6, 1957, set. No. 694,886

10 Claims. Cl. 100-93 This invention relates to a new and improved device for controlling the quality of the sheet in paper-making, and theprincipal object of the invention resides in the provision of utilizing a support, as for instance for adoctor for a calender roll, as a frame for mounting a new and improved device extending across the machine in close proximity to and parallel to the roll, with means for selectivity directing either cold or heated air or other fluid to the surface of the roll for, respectively, reducing an annular bulge in the roll or expanding an annular depression, to the end that the paper may be made very uniform as to the thickness thereof across the entire sheet.

Further objects of the invention include the provision of a device as above described including an elongated frame member for the doctor blade and mounted thereon there are a pair of air chests, one for hot air and one for cold air, in combination with selectively operable valve means for directing either hot or cold air at spaced points across the roll for the purpose above described; and the provision of a device as above stated including very simple control means whereby the roll may be heated or cooled as desired at any particular location across the machine.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which- Fig. 1 is a view in section through the calender rolls showing a form of the invention applied to one roll;

Fig. 2 is an elevational view, looking in the direction of arrow 2 in Fig. 1; t

Fig. 3 is an enlarged section, taken along the line 3-3 of Fig. 1; a

Fig.4 is a fragmentary section illustrating the valve control in a difierent position;

Fig. 5 is a view similar to Fig. 1 showing a modification; and

Fig. 6 is a perspective view showing another modification.

In carrying out the present invention, the same is shown as applied-to a calender roll in a paper-making machine, one of these rolls being indicated at 10. A doctor blade of the usual construction is indicated at 14 and this is mounted on the usual supporting frame therefor 16. As is well known, the frame 16 extends across the machine in closely spaced relation to the roll and provides a support for the dactor blade which operates in the usual manner with respect to the rotational surface of the roll 10.

The invention in the present case resides in the provision of a pair of parallel elongated superposed air chests which are separately indicated at 18 and 28. In the form of the invention shown in Fig. 1, air chest 20 is mounted on frame 16 and air chest 18 is mounted upon chest 20 through the interposition of a series of spaced, parallel, transverse valve bodies which are all alike and are indicated at 22. These valve bodies are positioned,

in series across the machine and there may be as many as necessary. A spacing of two to three inches has been found to be satisfactory.

The valve bodies 22 are welded at the top surface of air chest as is indicated at 24 in Fig. 3, but the top chest 18 is not rigidly secured to the valve bodies, merely resting thereon, and being held thereto by any convenient means as for instance dowel-pins 26. This is for the reason that the upper air chest 18 is adapted for hot air and the lower chest 20 for cold air, and this construction provides against any interruptionor'damage due to expansion of metal parts under differences in temperature.

Each valve body has an open-ended cylindrical hollow chamber, and each chamber has a longitudinally slidable and rotatable hollow cylindrical valve member or tube 28 which is provided with openings as at 30 for selective alignment or mis-alignment with passages 32 and 34 in the valve body 32. In turn, passages 32'and 34 are aligned with apertures 36 in the lower wall of the upper chamber 18 and apertures 38 in the upper wall of the 10. Since the roll 10 is rotating, this will provide an annular heated surface area on the roll by which means any indentation in the roll will be expanded so as to maintain a uniform nip pressure and thus the thickness of the sheet of paper across the entire width thereof will be kept uniform also.

If, on the other hand, the cylindrical valve member 28 should be rotated as in Fig. 4, then the cold air will be led as shown by the arrows in this figure to impinge upon the roll and thus contract the surfaces ofthe roll annularly in order to deviate an annular bump or ring thereon.

The valve member 28 is provided with a handle 40 by which it may be thus manipulated and if desired it may have a compression spring 12 mounted between the head and the outer end of the Valve body to normally maintain the cylinder in a retracted position where none of the apertures 30 coincide with any of the other apertures, so that the valve is normally completely closed and does not cause fiow of either hot or cold air to the cylinder. Also, if desired, the handle 40 may be provided with resilient notched bars 44 which tend to hold the same in the position in which the handle is set, as is clearly illustrated in Figs. 1 and 4. This provides for adjustment of the amount of hot or cold air allowed to flow, for different degrees of caliper variation en countered.

A modification of the invention is shown in Fig. 5 wherein the doctor blade frame 50 is provided with an oppositely facing angle-iron 52, thus forming an air chest which may be either the hot or the cold air chest. By placing apertures 54in the position shown, the same valve member 28 may be utilized in the manner as described above in the. same kind of valve body 22 having apertures as above described, etc. In this case the dowelpin 26 may also secure the same chest 18 as above described for the hot air and of course this chest will be provided with the apertures 36 as has already been described. Otherwise the construction is the same as before and the operation of the device is the same as above described.

Patented Apr, 25, 1961 In Fig. 6 there is shown a hollow tubular valve member 56' and in this case there is provided an elongated slot 58 which corresponds to those at 30. In this case, the valve member 56 may be adjusted longitudinally with respect to the apertures at 36 but the volume of: fluid parts will not vary. In this case, the variation is the distance between the open end or nozzle of the valve member 56 and the roll surface. By this means, the general effect of the fluid on the roll surface may be varied merely by varying the distance of the valve device from the roll surface.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

1. In a paper-making machine having a roll over which the paper in process passes and a doctor and doctor frame for the roll, that improvement which comprises a pair of fluid chests mounted on the doctor frame, a source of heated fluid connected to one chest, a source of cooled fluid connected to the other chest, a series of valves for the chests, said valves extending in mutually spaced relation longitudinally along the roll, means to direct fluid from each chest to each valve to the roll surface, and means to open and close each valve independently for selective cooling or heating of the roll surface at selected points.

2. In a paper-making machine having a roll over which the paper in process passes and a doctor and doctor frame for the roll, that improvement which comprises a pair of fluid chests mounted on the doctor frame, a

source of heated fluid connected to one chest, a source 7 of cooled fluid connected to the other chest, said chests extending along the length of the doctor frame, a series of valves for the chests, means to direct fluid from each chest to each valve to the roll surface, and means to open and close each valve independently for selective cooling or heating of the roll surface at selected points along the roll.

3. A sheet caliper control device for a calendering roll in a paper-making machine, said device comprising an elongated frameextending along the roll, a pair of fluid chests extending along the frame and mounted thereon in spaced relation to the roll, a series of valves for the chests, each valve comprising a cylindrical tube arranged transvesrely of the chests and generally normal to the axis of the roll, the tubes being movable with respect to the chests and having apertures selectively aligned or with or blocked with corresponding apertures in the chests, and means for moving the tubes for directing fluid from either chest to the roll surface at will.

4. A sheet caliper control doctor for a roll of a papermaking machine, said doctor comprising a frame extending along the roll, a pair of separate fluid chests extending along the frame, a doctor blade on the frame, a series of longitudinaly spaced valves extending along the chests, means to operate the valve to selectively direct heated or cooled fluid from one chest or the other through any selected valve to the roll surface at selected points along the roll for expanding or reducing the roll.

5. The doctor of claim 4 wherein the valves are located between the chests.

6. In a paper-making machine, having a roll, a sheet caliper control device, comprising a supporting frame arranged generally parallel to the roll in spaced relation thereto, a pair of conduits on the supporting frame extending along the same, a series of transversely positioned valve devices, each valve device being arranged to direct fluid from either chest to the roll surface at selected points thereon, and sources of heated fluid and cooled fluid, each source being in communication with a separate chest.

7. The machine of claim 6 wherein each valve device includes a hollow cylinder open at an end thereof adjacent the roll and having selective communication with a chest.

8. The machine of claim 6 wherein each valve device includes a hollow cylinder open at an end thereof adja cent the roll and having selective communication with either chest.

9. The machine of claim 6 including means to adjust the valve devices to approach or recede from the roll.

1.0. The machine of claim 6 wherein each valve device includes a hollow cylinder open at an end thereof adjacent the roll and having selective communication with a chest, and means to longitudinally adjust the hollow cylinder to and from the roll for adjustment of the effect of the fluid on the roll.

References Cited in the file of this patent UNITED STATES PATENTS

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