US2604424A - Glass fiber reinforced crepe paper - Google Patents

Description

1233 22, 1952 K. N. MATHEs GLASS FIBER REINFORCED CREPE PAPER Filed Dec. 18, 1948 Inventor Kenneth N'. Hath'es, b2 @CZ.J. v

His Attorney.

Patented July 22, 1952 Kenne h N. Ma inee, Schenectady, N. ss g or to General Electric Company a corporation of i s a g npplie tienne ember 18, 1948, Serial No. 65,988 g which are arranged substantially.paraller to the creping in such paper. v

--I-1eret f ore glass'andother types of fibers have been used in reinforcing .composite, sheet structures. a preconceived fashion between the laminae making up such structure. Such structures have been used. to augment or increase the tensile strength of the sheets to which they are applied, such increased strength manifesting itself parallel to the direction of orientation of the fibers.

While reinforced paper of the above types finds many apnlicaticnswhere incr d s r n h isindicated, it is unsuitable in applications where,bothstrength and, elasticity or the ability to. onfematc rr eu ar shapesis r quired as in wrappin co ls. w th tape- Insuch appli ations ccns der blestr th is required for instanc alensthe hp th apeused While elasticity an -an a i y t co orm tee r eular shap or 9 l pp na s. des a ine direction perpend cu ar t t e e th c the tape.

Heretofore, such a combination of strength and flexibility has been found only in fabric or textile tapes.

'Itisan obiectofthis invention to provide a paper tape or sheet. havin'gfavorable strength in one direction and elasticity perpendicular to this direction.

It is a further object of the present invention to provide a process of manufacture for crepe paper sheet or tape having desirable lengthwise strength and lateral stretch and conforming qualities.

Other objects will become apparent and the invention better understood from a consideration of the following description and the drawing in which Fig. 1 illustrates a method of and apparatus for making the tape of the present invention; Fig. 2 is an end elevation view of a portion of the reinforced crepe paper between the pressing rollers showing the arrangement of adhesive coated glass fibers thereon and Fig. 3 is similar to Fig. 2 except that the fibers are embedded in an adhesive coated paper.

It has been found that a tape or sheet having good strength in one direction and elasticity in another may be very simply manufactured by afiixing continuous glass fibers to crepe paper tape or sheet substantially parallel to the creping of such paper.

More specifically it has been found that a to crepe paper. More T e fi r are-inserted at random or in 1 Claim. (01. 154,53.6)

sheet or tape having. increasing strength in. one,

directioniand desirable elasticity in a direction perpendicular to the other direction may-"be simply made by cementing: glass 7 fibers to smi paper .so that .=the fibers are-substantiallyl aralr lelztosthe creping of the paper;

Reference may be. had to the, drawing for a detailed explanation of the present invention.

In'Fig. i-which depictsa; method of and ap paratusi'for making the reinforced crepe paper tape or sheet of this invention a sheet -l of crepeipap'er is shQWJ -I as being continuouslyrun wound from, roll 2 by any suitable means, Passed over guide roller 3 and fed between support roller 4 and pressure roller 5. The, sheet I of paper.

which is creped in the direction of motion may. be of any suitable width which after reinforcing may, if desired, be slit or cut. lengthwise to provide'a tape ofthe; desired width having the creping parallel to its, length. Glass fibers 6 may befifed on the paper sheet I parallel to the crepingc from spools. l which are so mounted. on spindles 8; and supports 9 thatv the movement of the paper sheet l between. support roller 4. and pressure roller 5-will cause theglassfiber's. 6 to be withdrawn from the spools. 1. as showns At some point between the spools} and pressure roll 5 thecontinuous glass fibers 5 areeoated with;'adhesive by any convenientmeanss For example. the: adhesive may be sprayed .omtjhe fibers, from nozzles Ill, asshown. in F'ig. .L. It. may also be brushed; on or alternativelyfthe fibers maybe dipped. in the adhesive or other conventional means of coating used. It is also possible to have roller 5 in the form of a hollow cylinder containing the adhesive and having holes in the wall thereof for feeding adhesive to the glass fibers as they are fed to the sheet.

The coated glass fibers 6 are fed between the support roller 4 and roller 5, the rollers being adjustable to firmly press the adhesive-coated fibers onto the crepe paper sheet I. If it is desired to press the fibers 6 onto the sheet with more force than is afforded by roller 5, a second set of rollers similar to 4 and 5, may be added next in train after the rollers shown. After the glass fibers 6 have been pressed on the surface of the sheet I, the adhesive may be cured or dried in any conventional manner suitable to the adhesive used. This may constitute a simple air dry or heat treatment among others. The reinforced crepe'paper sheet may then be cut into tape as desired or used in sheet form.

In Fig. 2 is shown a partial end elevational view of a typical sheet made according to this invention as it is positioned between rollers 4 and 5.

The creped sheet I is reinforced by a number of glass fibers 6 each of which is coated with a layer of adhesive l2 which causes it to adhere to the sheet I.

Alternative to the method of manufacture which includes coating the glass fibers 6 with a layer of adhesive is that of placing a layer of adhesive on the .crepe 'paper sheet l'p'rior to its contact with the glass fibers or covering the sheet with a layer of adhesive through holes provided in a cylindrical adhesive-containing roller to take the place of roller 5. This layer should be thick enough to adequately hold the glass fibers to the paper. In general a layer equal to about one quarter of the diameter of the fibers is suificie'nt for this purpose, though a thicker or thinner layer may be used.

In Fig. 3 there is shown an end elevational view of this alternative embodiment of the invention with crepe paper sheet I, and glass fibers 6 embedded or held in place on the sheet by means of a continuous layer 13 of adhesive superimposed thereon.

The only restriction onthe adhesive to be used in general applications is that it be elastic enough to withstand any slight lateral stress which may be placed on the glass fibers tending to displace them from side to side on the crepe paper sheet or tape while it is being drawn taut over the article to be wrapped. Any adhesive used in coating the entire sheet from which the reinforced sheet or tape is made should also be elastic enough to allow displacement of the creping in the paper to give a goodlapping action. In those 'cases in which the sheet or tape is to be used for special purposes such as for insulating purposes, the adhesive should have dielectric properties whichdo not detract from the overall insulating qualities of the reinforced structure. In some applications it may be desirable to apply an adhesive which will hold the glass fibers in place but yet be amenable to curing in place on the article after wrapping. In this connection the sheet or ta pe maybe coated with thermosettin g plastic materials in addition to the adhesive if desired. a

The number of glass fibers to be placed on the sheet material per-unit w'idthwill vary with the strength of the crepe paper used and on the final strength desired. In general crepe papers of low tensile strength will require'a greater number of glass fibers per unit width while stronger crepe papersjwill require -a smaller number.

The sheet or tape of the present invention finds application in all uses wherein an economical paper of great tensile strength and lateral stretch or flexibility and lapping qualities is desired. It is particularly useful in wrapping electrical coils such as those used in armatures, transformers and other electrical apparatus. -Since certain changes other than those indicated may be made in" applying my "invention without departing from the spirit or the scope thereof, it is to be understood that this disclosure is to be taken as illustrative rather than limiting and that it shall include all changes obvious to one skilled in the art.

What I claim as new and desire to secure by Letters Patent of the United States is:

A compositetape product which is suitable for Wrapping electrical coils and consists of an elongated sheet of paper having lengthwise creping and having adhesively aflixed on a surface thereof a plurality of elongated glass fibers individually spaced apart from one another from edge to edge of said sheet in substantially parallel relation to the lengthwise. creping of said paper, whereby said paper is given greater lengthwise'strength than such paper has when unprovided with such fibers without loss of lateral stretch and capability of conforming with irregular surfaces. 5

r 1 KENNETH N. MATHES.

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

UNITED STATES PATENTS Number Name Date- 1,078,682 Jagenburg Nov. 18, 1913 1,083,271 BrockjLII Jan.- 6, 1914 1,282,167 Angier Oct. 22, 1918 1,867,071 Collings et a1. July 12, 1932' 1,929,903 Schindler Oct. 10, 1933 2,026,194 Smith Dec; 3 1, 1935 2,089,405 Newkirk Aug. 10, 1937 2,135,057 Slayteret al. Nov. 1, 1938' 2,290,386 Schindler July 21, 1942 2,428,325 Collins Sept. 30, 1947 FOREIGN PATENTS Number Country Date 470,558 Germany Jan. 19, 1929 105,265 zAustralial Sept. 22, 1938

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