US1583788A - Method of and apparatus for finishing paper - Google Patents

Description

May 11 1926. 1,583,788

A. G. GILMAN METHOD OF AND APPARATUS FOR FINISHING PAPER Filed Oct. 20, ,1924 2 Sheets-Sheet l- /170 0 M fag Nae/zine Co a/ing Mac/vine A TTORNEYS INVENTOR BY A exander 6. Gilman v azwmw May 11 1926.

v A. GILMAN METHOD OF AND APPARATUS FOR FINISHING PAPER Filed OCt. go, 1924 2 Sheets-Sheet 2 '7 11v VENZOR Alexander 6. 61 man A TTORNE V5 Patented May 11, 1926.

UNITED STATES 1,583,788 PATENT- OFFICE.

ALEXANDER Quinlan, or KALAMAZOO, MICHIGAN.

mrrnon or AND APPARATUS For. FINISHING PAPER.

Application filed October 20, 1924. Serial No. 744,737.

This invention relates to improvements in a method and apparatus for finishing paper.

The main object of this invention is to provide an improved method of finishing coated paper whereby a uniformly smooth even surface and texture is secured.

A further object is to provide a method of' finishing paper by which the above results may be secured with a minimum of coating.

paratus for finishing coated paper securing the above results which is of large capacity A structure which is a preferred embodi-.

ment of my inventionis clearly illustrated in the accompanying drawing, forming a part of this application, in which:

Fig. I is a diagrammatic view of an apparatus for finishing paper by my improved method.

Fig. II is a fragmentary erspective view of one of the units employed in the finishing of paper by my improved method.

In the drawing similar reference charac ters refer to similar parts throughout the sev ral views.

eferring to the drawing, I have diagrammatically illustrated in Fig. I the units employed by me in the complete finishing of paper by my improved method. This consists of a coating machine designated generally by the numeral 1, the particular-machine illustrated being designed to apply a coating to one side only of the paper. From the coating machine the paper is passed to a drier, indicated generally by the numeral 2, this drier being of the loop type .and also being shown conventionally. The passage of the paper through the drier is designed so that when the paper is delivered therefrom, the coating approximates but has not reached the setting point.

From 'the drier the paper is passed through a smoothing machine which consists of a supporting cylinder 3, a p-lurallty of "guide rollers 4 and 5 ,and polishing or smoothing brushes 6 which are disposed to A still further object is to provide an ap-.

coact'upon the web of paper 7 while it is supported by the cylinder 3. l

The brushes 6 act upon the coated surface of the paper, brushing and smoothing the partially dried coating and forcing the'same into .the poresof the paper. These brushes are of fine material, that is, they have relatively fine filaments, the filaments being thickly set and'forming quite a firm compact body. In practice, the brushes 6 are driven at a relatively highrate of speed so that as the paper passes over the cylinder the coating is subjected to a verysubstantial brushing and smoothing action. The coating, however, is sufliciently dried while subjected to this action so that no material amount is removed by this treatment.

From the polishing or smoothing machine, the paper is,passed to a roll 8, or to a calendering machine indicated conventionally at 9, the calenderingniav chine being employed when it is desired to provide the paper with'a high polish. A satisfactory coating is that'commonly designated as enamel coating, commonly consisting of china clay, casein and satin White, the proportions being varied according to the grade ofenamel. The satin wliite is entirely omitted in certain low grade enamels, the percentage increasing in the 'higher grades as will be readily understood by those skilled in this. paper eating art.

By my improved finishing method, I am I enabled to produce a uniform finish of a.

very fine smooth character and this may be accomplished with a minimum of coating.

While the units employed by me in practicing my' improved method of finishing paper are mainly shown in conventional form, it" is believed thedisclosuremade will enable those skilled in the art to which my invention relates to embody or carry out my invention as may be. best suited or most practical for the particular mill or installation.

Having thus described my invention, what I claim as new and desire to secure by L tters Patent, is:

' 1. "The method of finishing paper consisting of coatingwith an enamel coating, passing through a drier. to dry to approximately the setting oint of the coating, subjecting. while in suc condition of dryness to the'ac- 'tion of a rotating brush, and calendering.

2. The method of finishing paper consisting of coating with an enamel coating, passa supporting cylinder for thepaper while I ing through a drier, subjecting while in acted upon by said brush, and a calendar 1 approximately dry condition to a brushing acting upon the paper successively in the action, and calendering. order named. 4

3. An apparatus for finishing paper com- In witness whereof I have hereunto set prising a coating applying means, a drier, my hand. a rotating brush driven at high speed and v having thickly set relatively fine filaments, ALEXANDER G. GILMAN.

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