US111820A - Daniel oeos-by - Google Patents

Description

y tutti@ trtzs sind @ffm Letters Patent No. 111,820, dated February 14, 1871.

IMPRovx-:MENT 1N APPARATUS PoR Simoon-une ANuPRi-ssme PAPER DURING-THE l MANuFAcTuRE. 4

I, DANIEL CROSBY; of Hampden, Penobscot county,

Maine, have invented an Improvement inthe Method.

oi' Smoothing and Pressing Paper, ofwhich the following is a specification. l

Figure 1 is a side elevation, and Figure 2 is a sectional elevation;

This improvement applies to that part of the paper'` making machine by which paper is pressed and smooth' ed while in a wet state. All such machines employ two or,i more pairs of horizontal press-rolls, and, in

connection with each pair, an endless apron of felt,

supported upon smaller cylinders and extending to each side of the press-rolls,one branch ot" the felt passing between the latter. rlhe felts, each with its pair of press-rolls, form a series arranged lengthwise of the machine, the paper passing from one felt to another, the functions of the felts'being to conduct the paper between the rolls to absorb the `moisture expressed from the paper by therolls, and in proportion as the -latter operation approaches' completion to impart ,a certain smolothness tothe surface of the paper.

My -improvement -consists in the substitution for the discharge of this latter function of a jacket of any suitable material covering the lower press-roll instead of the endless apron of felt.

' I use as many sets of-pressro1ls and felts as may he necessary to take out so vmuch of the water as to leave the paper,while still somewhat wet, yet suciently n'mieus to cohere while being removed from the last fclt'lvy means of the common Wooden rolls. Then, to perllnm the smoothing operation, dispensing with the additional l'elt heretotb'm employed and retaining the press-rolls, l. cover thc lower lone of each pair with a suitable jacket, the upper one remaining uncovered and smooth, and between the smooth and the jacketed press-rolls I cause the wet paper to be passed by the wooden rolls aforesaid. In other words I contract the felt to the limit ot' the circumference of the lower press-roll.

The advantages accruing from this improved method are- First, the production of a better quality of paper, 'inasmuch aswithiu the space .required for a felt can be placed a'series of five or six pairs of press-rolls with jack one n1" which pairs is capaola'ot itself, of imparting the. same'degree of smoothness to thesurface ofthe paper that one pair of press-rolls with a felt wouldimpart, and, afortiore', all the jacketed press-rolls that occupy the vroom 4of one felt are capable of imparting a higher nish than the apparatus whose place they take Second, a saving of expense, inasmuch as the num- -ber of press-rolls that can be used to advantage in any -given space costs 'much less than the pair of press-rolls with afelt that should occupy the same lace. p The operation of the 'series of upper smooth rolls and lower jacketed rolls upon the paper while in a moist and plastic state. is to' improve its `suni'ace 'and texture; in other words," to accomplish the same e'ect that calenders produce after the paper has passed between the drying-rolls.

It should be understood that the series of smooth and jacketcd rolls intervenes between the last felt and the'last drying-roll. i

Referring to the drawing, in which the dotted line represents the papera is a sectiouoi' the frame of a paper-making machine;

b d are two felts supported upon small wooden lengthwise of the" inders. c, and placed end to end fra-me; p

e e are the press-rolls,l between which the felt b passes; and

f f are those between which the felt'd passes.

It are the smooth upper press-rolls, and i the jack:

eted lower press-rolls ofthe series that form the sub# material, as described. ,I

DANIEL CROSBY. Witnesses E. J. DUDLEY, JOHN CROSBY.

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