US2569546A

US2569546A - Spinning cot

Info

Publication number: US2569546A
Application number: US636557A
Authority: US
Inventors: Robert C Treue
Original assignee: Dayton Rubber Co
Current assignee: Dayton Rubber Co
Priority date: 1945-12-22
Filing date: 1945-12-22
Publication date: 1951-10-02
Anticipated expiration: 1968-10-02

Description

7 Oct. 2, 1951 R. c. ma 2,569,546

SPINNING COT Filed Dec. 22, 1945 5 Sheets-Sheet l ATTOREYS R. C. TREUE SPINNING COT Oct. 2, 1951 3 Sheets-Sheet 2 Filed Dec. 22, 1945 luvsuron ROBERT C.TREUE,-

Arromvevs R. c. TREUE SPINNING COT Oct. 2, 1951 3 Sheets-Sheet 5 Filed Dec. 22, 1945 INVEN'IQR.

, ROBERT CQTREUE BE Patented Oct. 2, 1951 OFFICE SPINNING COT Robert C. Treue, Waynesville, N. (7., assignor to The Dayton Rubber Company, Dayton, Ohio, a

corporation of Ohio Application December 22, 1945, Serial No. 636,557

3 Claims. 1

This invention relates to textile machine units, such as aprons, cots and similar roll coverings used for the processing of fibrous materials.

Whereas in former times such textile machine units have been commonly made from leather, recently synthetic rubber has become more and more in use for this purpose. Excellent results have been obtained with roll coverings made of synthetic rubber materials which have fibers incorporated therein. Such units, after grinding, show a pitted or pack-marked surface which is caused by the fibrous materials breaking off close to the surface when subjected to friction or by their falling out entirely. These coverings automatically regenerate their pitted surface, since during use the friction suiilces to eliminate the new fibers which appear at the surface during wear. By this, continuous use of these textile units is possible for a long period of time without the necessity of regrinding or other surfaceconditioning processes.

However, these textile units above described have one disadvantage, namely that of being rather dependent upon the weather conditions, in particular on the humidity in the atmosphere. While these units give very satisfactory operation in dry weather, their efiiciency is considerably impaired with increasing moisture content in the air. This is probably due to the hygroscopicity of the fibrous materials and to loss of brittleness when having a certain moisture content. When these fibers become limp, they do not break off or fall out under the influence of friction, and thus no new pits are created at the surface as the unit wears down. Sometimes, in borderline cases, only some of the fibers exposed to the surface break off, which also does not give satisfactory results since the pits in this case are too far removed from each other in order to give sufllcient gripping action for the fibers to be treated.

It is an object of this invention to pro ide textile machine units in which this disadvantage has been overcome, and which are not dependent upon atmospheric conditions.

It is another object of this invention to provide textile machine units which do not show any eyebrowing or lapping up during operation.

It is still another object of this invention to provide textile machine unit which do not accumulate static electricity.

These and other objects are accomplished by making the textile machine units from synthetic rubber materials into which glass fibers have been incorporated. The glass fibers are substantially unhygroscopic, and thus the cots are not weatherdependent.

The invention will be more fully understood from the following description taken in connection with the accompanying drawings, in which:

Figure 1 is a perspective view of a textile processing roll covered with a unit according to this invention. I

Figure 2 is a cross-sectional view of the unit taken along the line 2-2 of Figure 1;

Figure 3 is a cross-sectional view analogous to that of Figure 2, but showing a modification of this invention;

Figure 4 is a cross-sectional view also analogous to Figure 2, showing another modification of this invention;

Figure 5 is a cross-sectional view on a considerably enlarged scale showing one fiber incorporated in the rubber material after it has broken oii under the surface and the cavity created thereby;

Figure 6 is a perspective view similar to Figure 1 but showing a modification of my invention;

Figure 7 is a fragmentary longitudinal section on an enlarged scale taken along the line l-l of Figure 6; and

Figure 8 is a fragmentary enlarged perspective view of the modification of my invention illustrated in Figure 6;

Figure 9 is a photomicrograph showing the surface of a textile unit consisting of rubber ma terial only;

Figure 10 is a photomicrograph showing the surface of a textile unit consisting of rubber material with sisal fibers incorporated therein;

Figure 11 is a photomicrograph showing the surface of a textile unit according to the invention.

Referring to Figure 1 in particular, it is a spinning roll with a cot ll according to this invention. This cot shows a plurality of cavities l 2 on the surface.

Figure 2, which is an enlarged cross-section of the cot H of Figure 1, shows the glass fibers it, which in this modification are straight fibers arbitrarily arranged. The reference numeral l 0 indicates the metal roll on which the cot is mounted. The numeral I2 designates the pits or cavities formed on the surface of the cot.

In the modification shown in Figure 3 the glass fibers l5 are substantially arranged in radial direction within the rubber material M. The cavities formed are designated with It.

In the modification shown in Figure 4 the glass fibers It are curved or curled. Cavities I9 are formed on the surface of the rubber material ll.

In Figure 5, l I is the rubber material into which the fiber (3 has been incorporated. This drawing fllustrates the formation of the cavity 12 by the fiber breaking off close to. but below, the surface of the textile unit.

In the modification illustrated in Figures 6 to 8 the fibers are arranged longitudinally and substantially parallelly to the axis of the textile unit. This modification has given the best results. In these figures the reference numeral 23 designates a roller which carries a covering 20. Embedded in the textile unit 20 are glass fibers 24 which extend mainly in the longitudinal direction. The friction exerted during grinding or use of .the roller coverings causes the fibers located on the surface to fall oh and thus to form longitudinally elongated cavities. These cavities are designated with 22 in Figures 6 to 8.

Figures 9 to 11 show photomicrographs of conventional textile units and of the unit of this invention illustrated in Figures 6 to 8. It will be seen from these drawings that Figure 9 does not have any cavities at all on the surface, that the unit shown in Figure 10, which is one made of rubber material with sisal fibers, has cavities on the surfaceinrelatively great distances from each other, whereas Figure 11, which shows the surface of a textile unit of this invention, shows the uniform and relatively close distribution of cavities on the surface.

While various kinds of rubber materials may be used for the article of this invention, it was found that by far the best results are obtained with Perbunan, which is ,a butadiene acrylic nitriie copolymer. Other butadiene condensation products give also very satisfactory results. One of the numerous compositions which have been tested and found satisfactory is the following:

Parts by weight It is well understood that this example is merely for the purpose of of illustration, but not for that of limitation.

As to the glass fibers usable for the purpose of this invention it is well to select the fibers not too thin nor too heavy. If the fibers are too thin, they pulverize under the infiuence of friction and then do not fall off and create pits on the surface. If the fibers are too coarse they do not break, because they are too strong, and they then remain on the surface. Such glass fibers present on the surface have a tendency to cut the thread or fibrous materials treated with the units. It has been found that fibers of a thickness ranging from 0.00055" to 0.00115" are usable; from these, fibers of 0.00055" thickness gave the most satisfactory results. Preferably the glass fibers are incorporated in the proportion of about 20 to 40 parts by weight per 100 parts by weight of rubber in the composition. It is also essential that the glass fibrous material is as free from slugs as possible, because the slugs do not immediately fall out as do the fibers.

The textile units of this invention may be manufactured by any method known to those skilled in the art. The rubber material is preferably thoroughly mixed with the glass fibrous material, the mixture laminated to sheets and the sheets wound on a mandrel. The unit, thus built up, is then wrapped with wet fabric material and cured. For example, the unit may be vulcanized in open steam at 300 F. for 45 minutes. After the fabric layers have been removed, the surface of the unit is ground whereby the pitted character of the surface is created.

The textile units above described have an excellent durability and strength. The surface, after grinding, has a plurality of cavities which are uniformly and relatively closely distributed thereover. They yield thread of very uniform appearance since they avoid lapping up or eyebrowing, and since no static electricity accumulates thereon.

It will be understood that while there have been described herein certain specific embodiments of this invention, it is not intended thereby to have this invention limited to or circumscribed by the specific details of procedure, materials, arrangement of parts, proportions, and conditions set forth in the specification or illustrated in the V drawings in view of the fact that this invention may be modified according to individual preference and conditions without departing from the spirit of the disclosure and the scope of the appended claims.

I claim:

1. A spinning cot for the processing of textile fibers which is relatively free from eyebrowing and lapping up during operation in both dry and humid atmospheres which comprises a body of rubber composition having glass fibers uniformly dispersed therein, said fibers being substantially parallelly arranged with respect to each other comprising longitudinally elongated cavities proand' the axis of the cot, and extending longitudinally of said axis, the surface of said cot duced by the removal of fibers from said surface.

2. A spinning cot according to claim 1 wherein the rubber composition comprises a. butadieneacrylic nitriie copolymer.

3. A spinning cot according to claim 2 wherein the glass fibers have a diameter of about 0.00055 in. to 0.00115 in. and are incorporated in the proportion of about 20 to 40 parts by weight per parts by weight of rubber.

ROBERT C. TREUE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,304,656 Rockofi Dec. 8, 1942 2,341,656 Rockofi Feb. 15, 1944 2,353,462 Harkins July 11, 1944 2,362,340 Bacon Nov. '7, 1944 2,386,583 Bacon Oct. 9, 1945 2,393,953 Bacon Feb. 5, 1946