USRE757E - Improvement in treatment of crude caoutchouc - Google Patents

Description

A. G. DAY.- TREATMENT OF CRUDE GAOUTGHOUG.

N0. 757. Reissued July 12, 1859.

Witnc'ssqs. Inventor.-

UNITED 7 STATES AnsTts c. bar, or sEYMoini,

coxxnrru a? IMPROVEMENT INI'TREATMENT oF'cRuoi: CAOUTCHOUC.

Specification forming part of Letters Patent- 15,0t7, dated-June lll. I856; Reissue No. 757, dated July 12, 1859.

To all whom it may corwcrn:

Be it. known that], AUSTIN G. DAY, of the town of Seymour, county of New Haven, and State of Connecticut, have invented a new and improved method of charging the pores of crude caoutrhonc, or commercial rubber, with alkaline or other equivalentliquid for the purpose of aiding in cleaning said article from the various impurities whiclrit contains; and I do hereby declare that the following is a full and exact description thereofirelerence being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of this invention consists in tlie uscot a peculiar apparatus for more 'efl'eetually charging the crude gum or other equivalent substance with alkaline or other liquid used in separating impurities therefrom.

The apparatus consistsot'a horizontal cyl inder, generally of iron, arranged with an iron tank above it and another of equal mpacity underneath it, the former to contain liquid for charging the cylinder after it is tilted with "the mnnninuted crude caoutchouc, and the latter for receiving the spent liquid drawn on from theiron cylinder after it has been used for penetrating the pores of the caoutchouc.'

1n the drawings, A represents the cylinder, made of boiler-iron, and of suitable size to contain the quantity of caoutchonc or other gun} that may be worked at a single operation, audiot' such strength as may enablcit to bear anyipressnre to which it may be exposed by being exhausted, or by forcing in air or liquid in amount equal to two or more atmospheres. H

The cylinder is supported in the horizontal position on the tioor '1, from which it is raised about one foot by means of the blocks U. A drain-pipe, 0, having a strainer at W, leads through the floor '1 to the vat or cistern N. Above the said cylinder, and supported upon the platforn't G, are two cisterns, E and F, connectedwith each other by the horizontal pipe .L- From these cisterns the pipes H. and I lead to cylinder A. An airpump at L, of suitable size, is connectedwith the top of the cylinder A by means of pipe K.

Yin the vat ,or cistern N, beneath the floor, as already shown, there is a pump, 1,'for which the supply pipe Q furnishes the means of discharging the alkaline or equivalent liq-' nor from cistern N to cisterns l." and I". In

the nut or-cistern N is put the ant-lame or other liquid used for charging the pores of the gum, consisting of caustic or carbonated alkali, or other similar liq-aid that will at once wateesoak the bark and sticks and cleanse and E, in sutlicient quantity to tilt the iron cylinder, calculated beibrehand, and the stopcocks .r and 1 being closed, the crude .caoutchonc, previously colniniinued by twice running through the toothed cylinders, is led into the cylinder A in suitable quantities for convenient working. Thus a cylinder seven feet long by forty-two inches diameter, internal |neasuremcnt,-will work from twelve hundred to tittecn hundred pounds at a charge. The movable head Q ot' the cylinder is put in its place and Secured by means of the keys and bolts Ri- Theair-pump atJ is then put in order for working, and the air exhausted from the cylinder A, and then the alkaline liquid allowed to rundown through .r and y and till the cylinder, and enter the pores and cavities. of the crude gum and water-soak and otherwise. act upon and dissolve to some extent the foreign bodies contained therein, thus rendering theforeign bodies specifically heavier I thairwatcr, while the caootchouc is lighter.

In most cases simply exhausting the cylinder and then letting on the pressure of the atmosphere will answer all-the purpose requirodgjbut in some cases it has been found necessary to put on an extra pressure of one or two atmospheres. This is generally done by attaching an ordinary forcing-pump to the cylinder, (not shown in the drawings, and by it force in more liquid till the pressure-gage indicates the amount of an extra" atmosphere.

The liquid is allowed to remain in contact with the caontchouc ordinarily from fifteen ,to twenty minutes, sometimes thirty minutes. Pipe 0 is then opeued,and the liquor descends -into cistern N, while the eaoutehouc isi'c moved to a fresh clstern ot' watera-nd thoroughly rinsed and washed. After the guin' has been suitably washed it isinp fit state to be transferred to toothed rollers arranged with a suitable slipping movement, wellknown to manufacturers of rubber goods, (when applied to plain rollers.) These rollers, working in dontact with .water, finish the washing of the gum and separate the last portions of alkali, and leave the rubber in the form of broad cor-1 raga-ted sheets, fit for drying and seasoning.

\Vhat'I claim as my invention in the present application, and desire to secure by Letters Patent, is- I f Charging the caontchonc or other like gnm with alkalineliquor or its equivalent by means of the exhausting apparatus herein described and represented. r

' AUSTIN G. DAY. Witnesses:

. WM. BAYN-OR,

ALL'AN RUTHERFORD.

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