US1267883A - Insulating material and process of making the same. - Google Patents

Description

' torso treat vulcanized fiber as to render it -more water-repellent and otherwise more JAMES llloOSlBl, 0h N0 1: t1: ISIIPUW'N, PENNSYLVANIA, ASSIGNOR .T'D DIAMOND NPA'JIPE E COMP J We Drag.

To all whom it may concern: I

Beit known that 1, JAMES Mcllnfrosn, a citizen of the United States, residing in Norristown, Montgomery county, Pennsylvania, have invented Insulating Materials and Processes of Making the Same, of which the followin is a specification One 0 ject of my invention is'to rovide a substance which shall be hard, dura' 1e and waterproof, as well as possess other qualities fitting it, for use as an electrical insulator, especially in connection with railway tracks.

4 l further desire toprovide a sim le, easily operated meth of preparing t e above noted material whereby it shall be possible suitable than hitherto for service as a track insulating material. lln cing out my invention ll employ as my chief raw material, vulcanized or parchmentized fiber in a. green state that is to say, fiber in its a condition except that it is saturated with water and has not been given the final drying orheat treat.- ment ordinarily necessary to prepare it for commercial use. By my process, such green fiber is impregnated w1th an om'dizable oil, such as oil or' an equivalent sub- 1|. WI- stance, by replacing the water-in it by an organic solvent such as acetone, by it a ing it in a bath of the same, for a period of time de endent upon its thichess. For exple, a one-quarter of inch have I require an immersion in the acetone bathor about forty-eight houra a w. r the fiber is lacedin' a, bath, of linseed or other oxidize; le oil for a lar period of time, as a result of which the I solvent is repl by said foil and the fiber while or is found to contain practically no water. The time and method of treatment may be varied by varying the temperature of the bath, by emplo 1 mechanical stirrers and by the use of a vacuum. In some. the green fiber mav lee-subjected to a vacuum inthe oil, withi the result that the contained a ris removed and re- 1 placed to'a greater or ,1

or nnrncuron'r, rnnnsrnvrn, a com a D rnocnee 015 are t: 1:;

tpeciucatlon or hetterr Patent.

1-7 sheets having a thichess of m found to:-

1 nt by said oil.

HON or IIDEZLA- G THE t rattan-a may a, mi,

Application a, January as, rare. berial lt'o. aiaece.

In order to fit the oil-impregnated fiber resulting from the above treatment for use as a track insulation, which is usually reguired to have certain definite shapes, it. is

immersed in hot water or treated by live I steam, as a result at which it becomes rela-;

tively pliable, so that it maybe molded, bent or shaped by pressure, or heat and pressure. lhe oil is then slowly oxidized by heat treatment until it becomes semisolid, such treatment usuall requiring from twelve to thirty-six hours, epending on the thickness of the terial.

As a result of this treatment the fiber is given a shape or form' which it will perlib manently retain, and it is found to be hard,

tough and practically waterproof, being incapable of absorbin appreciable amounts of water and not su ject to inj by the weather. It is noted that the heat treatment oxidizes the oil so that it is changed to a solid lllm without in any-way ectmg the parchmentized fiber in w contained.

I claim;-

which consists in im reg- "1111 at lllllldtll, with ,0? db reating said fiber to rend r a 5103 1; all all mm u ecting t to anoxidizing treatment to harden itand solidity said oleaginous material,

repellmg substance in liquid lormtreating.

the fiber to render it flexible; giving the fiber a predete ed shape; and thereafter hardening it and solidifyingthe water resubstance therein. F

l. a new article of manufacture, a

ch said tire" 2. The method which consists in, impreghard olded water-proof body consisting of pamhmentized fiber uniformly impregnated with om'dized oil; T In witness whereof ll a my sign J MolNTUSH.

ature.

ice