US1431489A - Coating paper - Google Patents

Description

F. P. REED.

COATING PAPER.

APPLICATION FILED SEPT. 28, 1921.

Patented not. w, 1922.,

Patented Unto lltl, i922,

FREDERIC PAYSON REED, OF EAST ORANGE, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 CHARLES C. OROUTT.

COATING PAPER.

To all whomit may concern:

Be it known thatwli, FREDERIO Parson REED, a citizen of the United States, residing at East Orange, in the county of Essex, State of New Jersey, have invented certain new and. useful Improvements in Coating Paper; and I do hereby declare the following to be a full, clear, and exact description of the invention, such will enable others skilled in the art to which it appertains to make and use the same. I

My invention an improvement in pa per dryingmachines, and relates particularly to a construction of dryer unit, adapted foruse with Fourdrinier or other paper making apparatus to supplant the bulky and expensive drying rolls now used with such machines. In the usual paper making machine, the paper passes from a series of press rolls to a drying apparatus, consisting of a large number of steam heated cylinders, sometimes thirty orv more, carrying a felt belt or apron, which supports the paper and which separates the paper from the source of heat with a solid damp belt, through which, b conduction, the heat passes to the paper. 11 my prior application, Serial No. 356,669, filed February 6, 1920, of which this is a divison, a construction of dryer is shown and described, wherein the paper moves with, and is supported by an endless belt of foraminous material, as for instance wire cloth, and a metal plate is arranged below the run of the belt supporting the paper, and

between the same and the source of heat.

With this arrangement, the paper receives the heat more eifectively, and a higher temperature can be used without danger of scorching or charring the paper, because of the free circulation of air between the paper and the hot plates. A plurality of sources of heat is provided, either in the form of gas jets, or electrically controlled heating units, and the said sources are dis-' Original application filed February 6, 1920, Serial No. 356,669. Divided and this application filed September 28, 1921. Serial No. 503,871.

tion are of a minor character, and of slight importance with the usual grades of paper, in some'grades, and especially in heavy stock the variations may be of importance. i

In the present application, I provide means arranged between the heating means and the foraminous belt, and constantly changing position with respect to the heating means, whereby every part of the said means will be uniformly heated and will distribute the heat uniformly to the paper.

In the drawings: a

Figure 1 is a side elevation of the im proved unit,

Figure 2 is a detail showing the connec" tion between the belts.

The improved heating unit comprises a suitable supporting frame 3 having at its top 4:, and at each end thereof, brackets 5, which support guide rolls 6 for carrying the foraminous belt or apron 7. The upper run of this belt 7, which is an endless belt, stretches between the rolls 6 beforementioned, and is supported at intervals by rolls 11, which are journaled in brackets 9, extending upwardly from the frame top 4. Below the frame top, and at each end thereof, the belt passes beneath counter-weighted tension rolls 16. These rolls are journaled in arms 18 extending outwardly from the frame 3, the arms being pivoted to the frame, and being counter-weighted as shown, by weights 19 in such manner as to hold the belt under a predetermined ten sion. A series of heaters 20 is arranged beneath the upper run of the belt, between the rolls 6, and between the rolls 11, the said heaters being of any suitable character, as for instance gas jets, or electrically controlled heating units.

The foraminous belt is composed of wire netting or woven wire cloth, formed of wires of any suitable cross-section, and of moisture and corrosion resisting material not distorted by heat. The said belt has air spaces as large as possible, consistent with a firmly made mesh. In the present instance the belt comprises a single web of netting of somewhat greater width than the paper to be handled, and maintained by the tension rolls in a taut condition. lln my above mentioned application, fixed hot plates are arranged between the heating means and the foraminous belt. In the present construe tion however, I dispense with the fixed hot plates, replacing such plates by a thin flexible sheet metal belt 21 secured to the toraminous belt in any suitable manner. (/are should be observed that the materials of the screen belt and the sheet metal belt are of the same coe'liicientof expansion, so that there will be no puckering of the screen above the belt. With this construction, since the metal plate travels With the screen belt, it Will be uniformly heated, throughout every part thereof, the said belt constantly changing position with respect to the heating means, so that very part thereof is subjected to the action of said means.

The paper to be dried passes from the last press of the Fourdrinier or like machine, not shown, on to the foraminous portion of the belt, at one end of the unit. The belt moves With the Web of paper, and it may be positively driven if desired, to travel at the same speed as the belt, the driving means being applied to one or both of the rolls 6. One or more dryer units may be used according to conditions, and from the last unit,

ean 189 the paper passes to the winding roll. The term screen, used herein, is intended to include all constructions of similar formation capable of performing the functions hereinbefore described, whether they be toraminous, perforate or of like formation, and of metal or any other material, in the form of wire or the like.

I claim:

1. In a drying apparatus, a source ol heat, a movable hot plate heated thereby, a screen belt thereover, connections between said hot plate and said screen belt, and driving means for moving said hot plate and said screen belt over said source of heat.

2. In a drying apparatus, a source of heat, a movable hot plate, a screen belt consist ing of parts separated from each other through which air may pass ircely, connections joining said hot plate and said screen, and driving and supporting means for moving the hot plate and the screen belt together over the source of heat.

In testimony whereof I allix my signature.

FREDERIG PAYSON REED.

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