US 257761 A
Description (OCR text may contain errors)
Patented May. 9,- 1882.
J. H. RIDGWAY. WATER PR'OOPING PAPER.
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UNITED STATEs PATENT OEEICE.
JOE n. EIDGWAY, oE PHILADELPHIA,PENNSYLVANIA.
SPECIFICATION forming part of Letters Patent No. 257,761, dated May 9, 1882.
I Application filed February 13, 1882. (No model.)
To all whom it 'may concern:
Be it known that I, JOB H. RIDGWAY, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented an Imprqvementin Waterproofing Paper, of which the following is a specification.
The object of'myinvention is to cheaply water-proof paper or pasteboard by applying parattine to it in the manner described hereinafter.
Heretofore paper has been rendered waterproof by saturating it with melted paratine; but Lhave found that paper can have a thin film of para'ine imparted to it by simply rubbing blocks, lumps, or granulated masses of that material on the surface of the paper.
Different appliances may be used in carrying' out the process. `ln the diagram shown in Figure 1 of the accompanying drawings, for instance, a continuous sheet, A, ot' paper is drawn from a roll in the direction of the arrow over and in contact with a table or support, B,
\ having a smooth face; or, in place of this support, a roller having journals adapted to fixed bearings may be used, as shown in Fig. 2.
A block, D, of 'solid paraffine is contained within a suitable receptacle, E; or there may be a number of slabs or a powdered or granulated inass of parafine in the said receptacle, in which aA Weight or number of weights fit freely, so as to force the parattine down onto the paper with a constant pressure. The paraftine has such an affinity for the paper that the surface of the latter will be coated with a `thin adhesive film of that material.
The coated paper may, it' desired, be passed between pressure-rollers.
When paper in sheets has to be coated appliances for passing the paraftine under pressure over the surface of the stationary sheets may be used. lt should be here understood,
however, that I neither claim nor rtrict myself to any specific mechanism or apparatus Wherewith to facilitate the coating of the paper.
While the paper thus prepared may not be so perm anentl y water-proof as paper saturated Both sides ot' paper may be treated in. the manner described.
I am aware that paraftine has been applied to fabrics for rendering the same water-proof, but always under the influence of such heat as to impregnate the fabric with that substance; but in my invention no heat is used, the solid parafline being applied to the paper while both are cold, and the paper having a thin film of paraiue imparted to the surface only.
I claim as myinvention 1. The mode herein described of imparting a coating of paraftine to the surface ot' paper or pasteboard, the said mode consisting in applying a block or blocks or granulated or powdered masses of paratline to the surface ofthe paper under pressure while the paper or the parafne is in motion, substantially as de