US1021660A - Process for the production of leather-board stock. - Google Patents

Description

UNITED sT TEs PATENT-OFFICE.

ALBERT n cLArr, or BaAmrnEnn ssAcnUsErrs,

COMPANY, or nos'ron, mAssAcHUsErrs, A

1,021,660. No Drawing.

To all whom it may concern:

Be it knownthat I ALBERT L. CLAPP, a citizen of the United States, residing at Braintree, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Processes for the Production of Leather-Board Stock, of which the following'is a specification.

My present invention pertains to an improved process for the production of stock .to be employed in the manufacture of leather-board, and has for its main object the production of a filler which, when mixed with amass of fibrous leather, will produce a substantially waterproof leathcr-board which, in addition to being substantiallyparts of soda ash, together with water to beaten up) and mixed therewith. ingmixed with the cellulose, a suitable prewaterproof, will be firm and pliable and possess a body texturallycapable of taking and holding a good finish.

The essence of the present invention resides in the employment of cellulose as a filler, and in treating the cellulose pulp in such a manner as to completely waterproof the finished leather-board of which the treated cellulose forms a constituent.

Any kind or grade of cellulose fiber may be used in carrying out the process, such as sulfate fiber pulp, soda pulp, rag stock or paper stock,- beaten out to a fibrousv pulp.

Preferably, the process will be carried out as follows: Cellulose, say 500 pounds, is beaten out with a sufiicient quantity of water toproduce a pulpy mass. This mass is then treated withan emulsion, preferably formed of elements some of which are inherently waterproof in their nature, as for. instance:

parts of mineral oil, 75 parts of rosin, 50 parts of red oil or stearin, 25

render the emulsion su fliciently fluid. This compound, which forms a fatty emulsion, is preferably heated and prepared in a' receptacle independent of theq pulpy mass,,. and

after being'prepared is added to the cellulose stock, (which has been previously After hecipitant, such as aluminum sulfate,

say to the amount of 150 pounds, is to be added,

which causes a precipitate to be thrown down from the emulsion, the precipitate covering the fibers of the cellulose, and being insolublerenders said fibers substantially waterproof. When the precipitation iscompleted, the

'sufiiciently water ing upon lulose thus treated of the cellulose,

ASSIGNOR 'ro HIDE-I'm LEATHER CORPORATION or MAINE.

ra'ocnss m 'rnn PRODUCTION OFLEATHER-IBOARD s'rocx.

Specification 01 Letters Patent. P t t d 2 ,1912; -A pplication filed January 4, 1911.

Serial No. 600,728.

pulpy mass is then dumped into a beater-load of, say, 1000 ,pounds. of leather fiber; The leather and the cellulose fibers are then thoroughly mixed and afterward formed into board in the usual way. a From the foregoing it will 'be noted that the precipitation takes place u on the cellu-' lose fibers, and inasmuch as t e precipitating agent expendsitself the leather fibers are una ected and retain their natural properties. It may also be lipon the emulsion v stated that the cellulose fibers are practically the chemicals used and retain their elasticity and fibrous properties. The red oil above referred to is the equivalent of claim oil, or as it is sometimes commercially known, saponified red oil. V v

The finished board may be said to contain waterproof cellulose fibers, mixed with natural leather-fibers, the cellulose fibers being board substantial y waterproof.

Having thus. described my invention,

what I claim'is: i 4

1. The process of producing stock for leather-board, which consists in waterproofing cellulose fibers, and mixing such fibers with fibrous leathen. a I

2. The' process ofproducing stock for leather-board, which consists 'in precipitatthe fibers of a mass of cellulose a waterproofing material, and mixing the celwith a massof leather fibers.

3. The process of producing stock for leather-board, which-consists in beating up cellulose,

precipitating an insoluble compound upon the fibers of the cellulose stock,

roof to render the "entireand add ng the cellulose fibers thus treated to a massof leather fibers.

4. The process of producing stock for leather-board, which 0 nsis'ts in beating up a charged cellulose, adding thereto a fatty emulsiom precipitating said emulsion, and

adding the fibers thus treated to'a mass ofleathenfibers. 5. The process of producing leather-board stock, which consists in beating out a charge of cellulose to produce a fibrous mass, adding to said mass an emulsion containing an inherently waterproofing material, precipitating said emulsion directlyupon the fibers and adding the waterproofed cellulose fibers to a charge of leather fibers.

6. The process of producing stock for leather-board, which consists in beating out a charge of cellulose to produce a fibrous mass, adding thereto an emulsion composed of mineral oil, rosin, red oil and soda ash; precipitatin said emulsion upon the fibers by the addlticn of aluminum sulfate, and adding the fibers thus treated to. a mass of fibrous leather.

' 7. As a -new article of manufacture, leather-board comprising a body of fibrous leather having incorporated therewith Waterproofed cellulose fibers.

8. 'As a new article. of manufacture,

leather-board comprising a body of fibrous 15 leather having incorporated therewith cellulose fibers having deposited thereon a waterproof precipitate.

In testimony whereof I have signed my name to this specification in the presence of 20 two subscribing witnesses.

ALBERT L. CLAPP.

Witnesses;

JULIA M. ENEGESS, ALEX D. SALINdER