USRE2262E - Improved process for rolling india-rubber cloth - Google Patents

Description

5 HAYWARD L BlcKFoRu Process for Rolling India Rubber.

Reissued lune 5, 1866.

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UNITED STATES PATENT OFFICE.l

,FltANGI'S`l l). IIAYWARI), 0F MALDEN, ANI) IRA E. SANBORN, OF BOSTON, MASSAOIIUSETTS,- ASISIGNEES 0F J ()II.N\G. iSICKFORD.

lMfPROt/ED' PROCESS FOR ROLLING INDIA-RUBBER CLOTH.

Vll-lpeeiIeation l'rnming part. ol' Letters Patent No. 7,189,- dated Marcil 19, 1850; extended seven years Reissue No. 2,207, datedMarch 20, 1866; Reissue No. 2.202, dated June 5, 1866.

DIVISION A.

has been extended by the Commissioner of Patents fora further period of seven years; and whereas we., the undersigned,I have bceome, by assignment or otherwise, the sole proprietors of the said patent and the exclusive property covered thereby; now, therefore, for the purposes of a reissue 'of the said patent, we do hereby declare the following to be a full and correct description of the invention of the said patcnlees.

The said invention consists in a new process of applying,r india-rubber, when reduced to .a plastic consistency, ontocloth, whereby greater and more permanent adhesion of the rubber to tile cloth can be secured than by any process heretofore known.

To make the invention clearly understood,

we will deserihethe ordinary process of coat' 1 ing cloths with rubber, in the performance of soften and grind the rubber into an adhesive 1 plastic mass, which can be molded into desired shapes or spread, upon cloth.

The ordinary method of spreading 'rubber upon cloth has been to pass the cloth and the adhcsi ve rubber between two or more revolving rolls,`by the action of which the rubber has been spread out into an even sheet, covering This Lsheet of rubf ber can, when cool, be stripped from the cloth and 'used for various purposes-in manufacturing, or the cloth with its outside covering of rubber, such as described, can be used for carriego-covers or sundry other devices; but it has been Vfound that fof yother purposes in rnbber manufactures, such as machine-baiting, conducting-hose, the' linings of shoes, Sac., it

was necessary that the rubber should be forced into the body of the cloth-t'. e., into the meshes or spaces left by the threads of the clothso that the cloth could be prepared with rubber forced into it and incorporated with its threads or libcrs, in order to render the pre i pared cloth partially adhesive, wllereby other coats of rubber could be added to it and made to adhere to it.

The old process for accomplishing this latter object was to dissolve india-rubberinspirits of turpentine or camphene until it was so soft that it could be spread upon cloth by means of rollers. This rubber dissolved in camphene was so much softer than therubber made plastic by grinding between heated iron rollers that it was, by simple pressure, forced linto the meshes of the cloth, and for some purposes accom plished the desiredcnd. This lnethod of manufacture was open to great objection on account of the expense of the camphene used iu dissolving the rubber, the disagreeable odor imparted to goods by it, the

'danger ofsvfire or explosion, the necessity of l great space in the factor f for drying the'goods before they could be used, and the injury to the health of operators in such factories.

Togobviate these diiiiculties manyexperiments were instituted by the said IIAYWARD and B IQKFORD, the main object being to dispense with the use of` camphene and yet be` able to' produce cloth with a coat ot' gum forced into and incorporated with the cloth. In order to accomplish this resultin accordance with the invention of the said parties, a series of hollow iron rolls heated internally by steam are to be employed and made to revolve by .machinery. These rollers do not require very particular description, as they are familiar to rubber manufacturers. A series ot' two'or more rolls can beused. Two rolls contiguous,\vhetl1er laterally or one above the other, revolving in opposite directions, one carrying the cloth to be coated, the other the coat of rubber to be applied, perform the functions necessaryto this invention, on conditiouthat the roll which conveys the rubber to the cloth shall revolve with a velocity exceeding that of the roll which carries'the cloth.V If the two rolls move either 2 caca with equal velocities, or if the lroll carrying l the clothA moves faster than the rollcarrying the rubber, the object of this invention Will not be attained.

The accompanying drawing exhibits a set y of three of such rolls, a b` c, with the cloth C and rubber R applied t them, the directions of rotary motion of such rollers as Well as thc direction of the movement of the cloth being indicated by arrows.

D is the roller from which the cloth proceeds. E is another roller, on which the cloth iswound after having been coatedl With the rubber.

Aquantity oftheindiarubber', previously' prepared by being ground, is placed etween two ot' the rolls, which revolve until in a short time the mass of rubberis still further heated and softened and spread in athick sheetor coat around the fast roll. The thickness of the coat maybe such as may be desirable, according to the nature, quantity, and quality of cloth. The cloth, rolled on a suitable reel, sleeve, roll, or shell, is next to be brought to the machine, and is to have one end placed upon one of the slow rolls, in order that it may be lbetween it and of the cloth audincorporatesit with the threads o tl the cloth.,` In this process a portionA ofthe sheet of rubber which covers the faster roll is collected into a mass (called by rubber .Workmen the bank 7) between the clothand the faster roll, and this bank is rolled over and over by means of the action of the rollers, and assists in the operation f forcing the coat into the cloth. This is W aty We' call, t'orconvenience,

Abe immediately used in manufacturing.

the l friction-coat, .and the cloth so called can It is often necessary that the cloth should have a similar friction-coat upon its other side, and

this object is accomplished by reversing thev cloth and again passing it in a similar Way through the machine.

In practical manufacturing the velocities of the rolls differ according to the nature of the rubber and the ingredients combined with it, and according to the nature of the Work, whether coarse or fine, heavy or light.

linings it has been found best that the slower rolls should make six revolutions While the faster roll makes ninevrevolutions; but in coating the heavy duck used in machine-belting the difference in speed should be much greater.

What we claim as the invention of Athe said described-that is to say, by means of twov contiguous rolls revolving in opposite directions, one carrying the clothto be coated, the other the coat of rubber t-o be applied, thelat ter revolving at a higher rate of' speed than the former. l

In testimony whereof we have signed our names to this specification before two subscribing witnesses.

- FRANCIS D. HAYWARD.

IRA E. SANBORN.A Witnesses:

l J. .N. DURELL,

HENRY S. Pisalmvs.v

In vcase of the .ordinary thin cloths used for shoe-

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