US1883183A - Marking roll composition - Google Patents

Description

Oct. 18, 1932.

Filed July 28, 1930 N N MN Patented Oct. 18, 1932 HERMAN WEBER, OF SHEBOYGAN, WISCONSIN MARKING ROLL COMPOSITION Application filed July 28,

This invention relates to a markin roll for imparting a watermark or other esign to paper or other fibrous webs as they move through the web making machine and more particularly to such a device having an im proved marking surface thereon.

Various grades and qualities of paper and like fibrous bodies are vin commercial use, and, hence, it is desirable to mark the differ ent grades to properly identify the same and also their manufacturer; For this purpose, marking rolls are employed, in comunctiou usually with the press or drying rolls of a paper making machine, to impart a watermark or other design identifying the particular grade of paper and the manufacturer of the same on the paper web as it moves through the press or drying rollsu A number of forms of these rolls have come into commercialuse, among the most important of which are the stereotype forms and the engraved rubber marking surface type. The former, as the name implies, is composed of a supporting roll, to the periphery of which are secured stereotype plates bearing the design to be imparted to the paper or other fibrous webs; These plates are relatively hard and clearly reproduce the desired des1gn, but are objectionable in that they tend to cut into the paper web. For this reason, it is necessary to wrap the stereotype plates with oneor more layers of fabric to lessen the shar ness of the impact against the paper web. bviously, this wrapping is not durable, and wears away after a short time, necessitating the rewrapping of the stereotype plates. The net result'is an increased expense, greatly lowering the efiiciency of this type of marking roll.

f The other form of 'roll mentioned above may comprise a hard rubber marking surface vulcanized to a narrow soft rubber band or sleeve secured to a supporting roll or wheel, or a hard rubber marking surface secured to a supporting roll by intermediate layers of hard and soft rubber vulcanized or cemented together.

The hard rubber marking surfaces of these rolls do not require a fabric wrapping, but

1930. Serial N0. 471,201.

possess the disadvantage in that the rubber forming the marking surface is not quite hard enough to produce a clear, distinct watermark or other design. Furthermore, this material is not suficiently resistant to the high heat and pressure developed during the marking operation and is deteriorated by these forces after a short period of time. When this occurs, it is necessary to replace the marking surface by a new or re- 60 newed surface, but, because of the manner of mounting such surfaces on the supporting roll, this can only be accomplished by a long, expensive, tedious operation requiring the removal of the rolls from the paper machine. M l have now devised a marking roll having a marking surface thereon composed of hard,durable, easily engraved composition, which is quickly and easily detached from and applied to the roll with but little labor,

It is accordingly an object of this invention to provide a paper marking roll having a hard, durable marking surface so mounted on the roll as to obviate the necessity of fabric or similar wrappings to prevent the surface from cutting the paper web.

It is a further important object of this invention to provide a hard, durable marking surface for a marking roll which can be guickly and easily applied to and removed 8 rom a supporting roll or shaft.

It is a further important object of this invention to provide a marking surfacefor a paper marking roll in the nature of a multisectioned sleeve of a hard, durable, easily en- 35 graved composition. 1

Other and further important objects of this invention will become apparent from the following description and appended claims.

Referring to the drawing, which discloses a preferred embodiment of my invention:

Figure 1 is a front elevation of a marking roll of this invention with parts in section and parts broken away,

Figure 2 is a sectional view taken on line IIII of Figure it.

Figure 3 is, a longitudinal sectional view through a composition marking sleeve before 1% the same has been subjected to heat and pressure.

Figure 4 is a longitudinal sectional view through a marking roll showing a marking sleeve on an enlarged scale and with. parts broken away.

As shown on the drawing:

The general construction of the marking roll of this invention, indicated as a whole by the reference numeral 1, is similar to that disclosed in my copending application, Serial'No. 471,197, filed J uly 28, 1930, and comprises a hollow core or support 2 having ournal extensions 3 in the ends 4 aid Journal extensions are repressed in thereof.

tained securely in place by keys 5.

. material, such as natural rubber, synthetic rubber, cork,,compressed fiber compositions or the like.

* The cushioning layer 7 is surrounded by the marking surface 9 of the roll, which comprises a plurality of sleeves 10 of such. di'ameter as to slip over and fit rather snugly about said layer 7. The outer surface of the sleeves 10 carry a design 11 which may be complete in itself or form a part, of the entire design 12 of the roll. In either case, it is necessary, in order to secure a proper reproduction of the design or designs, on the paper or like fibrous web, to prevent relative rotative movement between the various sleeves 10 of the marking surface. This is accomplished by providing slots 13 at various points about the abutting ends of the sleeves 10 and fixing in the cooperating slots of adjacent sleeves small pins 14 which prevent displacement of one sleeve with respect to the other.

For maintaining the sleeves 10 on the support ng core 2, I provide a plurality of washers 15, 16 and 17 on the small diameter ends 18 of the core and hold said washers against the ends of the outermost sleeves 10 by the nuts 19 and 20 threaded onto said ends 18.. The

retaining washers 15 and 17 are of metal,

while the washers 16 are of rubber or similar resilient material, so that, when the nuts 19 and 20 are threaded home, the washers 16 are compressed between the metal washers 15 and 17. Accordingly, the sleeves 10 will be resiliently held on the core 2 and will yield sufliciently when they strike apocket or similar depression or irregularity in the surface of the roll'with which they contact in marking the aper, thereby preventing uneven marking y the marking surface.

, The marking sleeves 10 of this invention are composed of a hard and durable material, preferably a compressed fiber composition which will effectively withstand the heat and pressure incident to the marking operation. AcompositionI find very suitable for this purpose is disclosed in Figure 3 of the drawing and is made from! laminated sheets of paper or fabric and bakelite composition compressed between metal plates under a hydraulic pressure of 2000 tons at a temperature of 350 F. The heat and pressure causes the resin to melt thus binding together the fibers or threads in the fibrous sheets. After several minutes under the above heat and pressure, the material solidifies into a hard, composite mass, resembling bakelite, in which the layers of fibrous material have practically lost their identity, (Figure 4). The resulting composition, though very hard, 35 Brinell under 500 Kg. pressure with 10 mm. ball, is easier to engrave than hard rubber. Further, it has a compressive strength parallel to lamination of 14,000 lbs. per sq. in.; perpendicular to lamination over 38,000 lbs. per sq. in. and a tensile strength of 10,000 lbs. per sq. in.

, While marking sleeves of this composition are very hard, nevertheless, due to the provision-of theQcushioning layer 7, it is unnecessary td'wm the sleeves with fabric, as said layer 7 produces a springy impact of the sleeves against the fibrous web, thus preventing the web from beingcut by the marking surface. Moreover, this composition has a high resistance to heat and pressure, much more so than rubber, and, hence, marking surfaces made therefrom have a' much longer useful life than the usual rubber marking surfaces.

The mounting of the sleeves 10 on the supporting roll as described permits of the mark- 1 ing surface being detached fronrthe roll very easily and quickly without shutting downthe machine and also provides for ready application of new or differently engraved surfaces I on the roll.

While I have disclosed a preferred form of compressed fiber composition for forming my marking sleeves, it is to be understood that I do not intend to be limited thereto, as sleeves of other hard temperature and pressure re- Z sis'ting compositions may be used with good results.- For instance, I may employ a composition made by compressing canvas sheets having perimeters wherein the warp and woof are equally staggered, with a synthetic resin binder under high pressure and temperature. The resulting composition is unaffected by heat up to a point wher carbonization sets in. It is not affected by changes in temperature,

hot or cold water, or mineral or vegetable oils.

Generally, it may be said that any'hard, durable, heat resisting compressed fiber com-, position is suitable for forming the marking sleeves of this invention. Marking surfaces of such compositions are usually harder, easier to engrave, cheaper and much more durable than the ordinary rubber marking surfaces now in general use, and, hence, their use results in a material saving in the-initial and replacement cost of the marking rolls. With this saving considered in conjunction with the saving in time and labor in building up the rolls and applying and replacing the marking surfaces, it will be readily appreciated that I have devised a roll which will greatly increase the efficiency of present day paper marking devices.

I am aware that certain changes maybe made in the structural details of my device without departing from the spiritof my invention and, accordingly, I do not intend to be limited in the patent granted hereon except as necessitated by the prior art.

' I claim as my invention:

l. A marking roll comprising a supporting core-having thereon an engraved marking surface of a hard heat and pressure resistantlcompressed fiber composition.

2. A marking roll comprising a supporting core, a layer of resilient material secured thereto and a detachable engraved marking sleeve of hard heat and ressure resistant compressed fiber composition on said layer and of such diameter as to snugly fit about said layer.

3. A marking roll comprising a supporting core, a layer f spaced resilient sleeves secured to said core and a detachable sectional engraved marking sleeve of hard, heat and pressure resistant compressed fiber comper sheets and bakelite.

composition about said layer and of such di- 7. As a new article of manufacture, a Y

marking sleeve comprising a sleeve of hard, heat and pressure resistant, compressed fiber composition. I

8. As a new article of manufacture, a marking sleeve for a watermaln'ng roll comprising a sleeve of compressed fibre-resin compositlon.

9. As anew article ofmanufacture, a

marking sleeve for a watermaking roll, comprising a sleeve composed of compressed pa- 10. A marking surface for a watermarking roll comprismg aplurality of sleeves of a compressed fiber-resm composition.

11. A marking surface for a watermarking roll comprising a composed of compresse bakelite.

In testimony whereof I have hereuntosubscribed my name at Chicago, Cook County,

Illinois.

HERMAN G. WEBER.

paper sheets and position on said layer of such diameter as to snugly" fit about sald layer.

4. A marking roll comprising a supporting core, a layer of spaced resilient sleeves secured to said core and a plurality of detachable abutting marking sleeves of hard, heat and pressure resistant, com ressed fiber composition about said layer 0 such diameter as to snugly fit about said layer-and means for detachably securing said marking sleeves on said resilient layer.

5. A marking roll cgmprising a supporting core, a layer of spaced resllient sleeves a plurality of marking secured to said core,

sleeves of hard, heat and pressure resistant,

compressed fiber composition about said layer, means for'preventing relative movement between said marking sleeves .and means for securing said marking sleeves on said core. 1

6. A marking roll comprisinga supporting core, a layer of spaced resilient sleeves secured to said core and a plurality of detachable engraved marking sleeves of hard,

heat and pressure resistant, compressed fiber plurality of sleeves

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