US 2062317 A
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Description (OCR text may contain errors)
Dec. 1, 1936.T J. F. JosEPH 2,062,317
Filed April 5, 1935 Patented Dec; 1, 1936 UNMEED sTA'rEs PATENT OFFICE aosasrr nom. i
Norwood, Ohio, a corporationof hio Application April 3, 1935, Serial No. 14,537
This invention relates to a roll of the type employed in paper making machines and with which a doctor is commonly utilized.
An object of the invention is to provide a roll of this kind adapted to resist wear and the adhesion of paper and paper pulp and the like to its surface. Another object is to provide such a roll which is adapted to resist the wear ordinarily resulting from a doctor bearing against the roll and at the same time which roll is so formed as to obviate injury to the doctor itself.
Another object is to produce a roll of the kind described cheaply and efficiently.
These and other objects are attained by the means described herein and illustrated in the accompanying drawing, in which:
The figure isv an elevational view, with parts broken away, of' a roll produced according to the present invention.
Heretofore rolls of the class herein considered, have been manufactured of various materials, including Wood, granite, and other materials upon which hard smooth sur-faces were capable of being produced. It was necessary, however, to keep wood rolls constantly wet, even during the period j when the machinery with which they were associated, was not in'use, so as to a'void splitting of the rolls. The granite rolls were objectionable because of the great expense involved in producinggranite rolls of the large size necessary m modern paper machinery. Furthermore, there has been produced heretofore rolls comprising a body formed of a binder, such'as rubber havingl incorporated therein crystalline or rock particles for forming a firm'working surface adapted to avoid the adhesion of paperV pulp and the like thereto. Rolls such as the latter have, however, possessed this disadvantage, that their use re- 40 sulted in undue wear on the doctor commonly utilized with such rolls when employed as ."top rolls'? inpaper making machinery. i Another markedgdisadvantage noted in connection with rolls having incorporated therein crystalline particles such as granite, ha been the formation of cracks in the roll due to lack of `eifective bonding between such smooth-surfaced particles and the binder. Similar undesirable results accompany the use of flbrous particles, sometimes utilized in the roll in the manner of the crystalline particles, such results again being due to lack of an integral and cohesive union of the binder and the particles.
i The present invention obviates the disadvantages enumerated above by providing a roll ;formed with a binder, suchl as rubber, having irregular cellular particles, such as particles of blast furnace slag, incorporated therein. The roll so formed need not be constantly treated as was necessary with wooden rolls and may be 5 readily and efficiently as well as cheaply manufactured, as cbmpared with the older type of granite roll. Final1y,.the roll of this invention, due to the inclusion of slag of the kind described, which is considerably less abrasive than mate- 10 rials heretofore employed, reduces wear on the doctor employed with top rolls.
In greater detail, and with reference to the drawing: The roll of this invention may comprise a core 5, preferably metallic, and enlarged 15 as at 6 along that portion upon which the roli proper is to be formed. The body -l of the roli of this invention is formed of a hard rubber or ebonite compound, which serves as a binder. Incorporated in the binder, throughout the surface 20 thereof and preferably throughout the whole body of the binder, are particles of slag 8, blast 4 furnace slag having been found particularly effective for the present purpose. An analysis of this slag has disclosed its characteristics as fol- 26 lows:
' Per cent Silicon di-oxide 36.8 Aluminum oxide 10.43 Calcium oxide 32.5 Magnesium oxide.. 14.100 Iron 1.52 Manganese .500 ulphurl i 1.
This analysis, however, it should be understood,`
is subject to wide Variation, and is set forth merely as illustrative.
In the drawing, a portion only of the roll has been shown as provided with the particles 8 but 40 v it is to be understood that these are incorporated throughout the total surface or body of the binder. The roll of thisinvention may be produced by any suitable means or process,` as will be understood. However, it has been found that an'45 efflcient manufacturing process consists in .turning the core upon a lathe and applying the resilient material orrubber to the enlarged portion-B, while said material is in a'plastic condition. During the application of the rubber, the 50 slag 8 is progressively incorporated in the plastic binder. the latter and the slag being of substantially the same proportion as to weight. An emcient method of combining the plastic binder and the slag is to masticate the two together before/f' 2 o o ,oeasiv w the application thereof to the core; The body of the roll thus formed -is subsequently. -cured. Thereafter the surface of the roll body is 'ground to producea surface-that is uniform and smooth thereby eliminating any projecting particles or points thereon. It is to be noted that the particles 8 being of cellular structure throughout, are not wom smooth by subsequent regrindings of the roll but rather additional 'minute apertures and pits appear on the surfaces of the particles, thereders, might 'be used for the slag partlcles 8. Ma'-` terials of this nature possess irregularities of form and surface whereby they are eculiarly adapted to be keyed or locked permanently in the binder.
What is claimed is:
1. A roll comprising a resilient binder and 'slag particles incorporated in the binder throughout the surface of the roll.
2. A roll comprising a rubber .binder and slag particles incorporated in 'the'binder throughout the surface of the roll;
3. A roll comprising a rubber binder and particles of blast furnace slag incorporated in the' binder throughout the surface of the roll.
4. A roll comprising a rubberbinder and particles of blast furnace slag incorporated inthe surface and body of the binder;
5. A roll for paper machinery or the like, 'and comprising a core, and a roll body attached to thel core and consisting of a rubber binder having slag particles incorporated therein throughout the 'surface thereof for providinx a wear-resistant roll surface adapted to minimize injury to the doctor normally utilized with'rolls of the kind described.
6.`A roll for paper machinery or the like and comprising ametal body, the outside' covering of which consists of a rubber binder, having partlcles of blast fumace slag, incorporated therein for providing a wear resistant surface, the latter being adapted to avoid a'dhesion of paper and paper pulp thereto and to mlnimize abrasion to the doctor normally utilized with rolls of the kind described.
7..: A roll comprising a rubber binder and particles of blast furnace slag incorporated throughout the binder and of substantially the same proportion as to weight as that of the binder.
8. A roll comprising a'bincler with slag-like cellular particles incorporated therein.
9..A roll comprising a binder having incorporated therein slag-like irregularly-shaped particles of cellular structure.
10. A roll `comprising a binder with slag-like irregularly-shaped particle's incorporated therein.
11. A roll comprising a binder'having incorporated therein particles of the class of slag and cinders.
12. A roll for paper machinery or the like and comprising a metal body the outside covering of which consists of a rubber binder havingparticles i of the class of slag and cinders incorporated therein. for providinga wear-resistant surface,
said particles being of substantlally ,the -same JOHN F. JOSEPH.
proportion as tovweight as that of the binder.,