US1768498A - Sheet-drying process anb apparatus - Google Patents

Description

June 24, 1930. 1. B. wlLLsl-:A ,1,768,498

' l SHEET DRYING PROCESS AND APPARATUS l Filed April 5, 1929 lNvNToR f Patented June 24, l.1930

UNITED. STATES Parra-.rrr oF'FlcE l.warns 3;. wILrsEA, or aocnasraa, New Yoan,l AssIeNoa rro wILLsEA wenns, or

BOHEBTEB, NEW YQRI, A CRPQRATION 0F NEW' YORK SHET-DRYING PROCESS AND APPARATUS Application led'April 5,'192t). Serial No. 352,758.

The invention relates to a paper drying process and apparatus, and has for its object an improved process and apparatus whereby the time required for seasoning or drying paper may be reduced to a minimum.

Another object of the invention is to provide a paper drying apparatus with means for applymg heatto that part of the sheets requiring the longest time for drying.

To these and other `ends the invention consists in the construction and arrangement of parts that will appear from the following description when read in conjunctionv with the accompanying drawings, the novel features being pointed out in the claims followmg 'the description. y

In the drawlngs':

Figure 1 is a transverse section o f a paper drying apparatus constructed according to one embodiment of the invention, and

Figure 2 is a side elevation of the same, parts being sectioned awayto expose underlying' parts. y

In printing establishments, paper is often printed with more than one impression, an in color printing and lithographing it is very important that the several impressions be in perfect registration. The paper as received from the mill, due to its hygroscopic nature, is often too damp or too dry,'and as a result gives up some of its moisture to the air of the press room or takes up press room moisture when exposed thereto, resulting in contraction or expansion of the sheets respectively, and often in curling of the sheets as the change is' seldom uniform vthroughout the sheet. As a result of this contraction or expansion of the sheets it is impossible to secure a perfect registration of successive impressions on the sheets.

To overcome this diiiculty, the paper received from the mill is seasoned orcondi- -tioned by blcwingvair from the press room over and between the sheets suspended ink bundles from carriers. Since the sheets 'of the bundles are clamped together by the suspending means,'it is impossible to blow air between them at that point, so that it is necesl sary to invert the sheets and repeat the opera-A tion to secure uniform seasoning.

By means of my improved process and api bodiment of the invention, radiant heat is appliedl to the bundle or stack of sheets in the region of the suspending devices, so that the moisture is driven from the portions of` the sheets compressed by said devices to lower portions where it can be reached by warm'air currents. y, Referring to the drawings,- the apparatus4 comprises a casing 1 of suitable sheet material arranged to be opened at its intake and delivery points. Arrangedyvithin this casing are the upright supporting members 2 and 3 on which are mounted the guide rails 4 and 5. Mounted on the guide rails to move longif tudinally thereof are 'a plurality of carriers,

each comprising a rod or shaft 6, having rollers 7 and 8 at lts ends and a pair of clips 9 and 10 mounted thereon between the rollers. From each pair of clips a bundleor stack ofA paper sheets 11 is suspended.

4Air is blown upwardly a ainst the sheets by means of a motor driven lower 12 having the pulley 13. The air is taken from the casing, directed over the heater 14`and against the lower edges of the sheets through perforations in the Wall 15. extending between' and supported onthe su porting walls 2 and 3. The same air 1s use over and over, provision being made, however, for exhausting some ofthe saturated air through the vent 16 f and admitting fresh air through the vent 17,

if desired.

It will be understood that the force of the i air currents have al tendency to separate the sheets at the bottom and rise between them, but at the top the sheets of each stack are held together by the clips 9 and 10, so that the air cannotcome in contact with the sur'- faces of the upper ends of the sheets. Consequently, the lower ends of the sheets are dried much more rapidly than the upper ends. Means have been provided for securing a more Irapid drying of the sheets by driving the moisture downwardly from the upper ends where they are clamped. Said means comprisesheating deticesarranged Ato l radiant heat to the upper'ends of the sheets.

j ends of the sheets. .-I-

' with reference to a 'endsof the sheets by drivingmoisture down-A wardly, and thus cooperates-with the' warm airvfrom it the moisture' the sheets. Y Y Y While" the invention has been described particular embodiment, it-is not limited to thef specific disclosure shown, and this applicationis intended to cover such changes or modilicationsfas come vwithin the intent of the improvement or the sheets clamped together, means or scope of the following claims.

Iclaim: 1.; In .a sheet dryin apparatus comprising a casing, the'com mation ot means' in *said casing for suspending a lurality ot and means for heating the clamped portions of the sheets near and adjacent 'thesuspendl I sheets-clamped together',

sheets,

ing means v2.1m a sheet dhyin in va casing, the 'com inatio'n of means in 'said casing'vir4 air currents upwardly. against thefsheets causing them passes between ranged over' and adjacent andmeans'for directing the'heatfrom said heating means clamped portions' of the sheets.

l 8. In a sheet drying apparatuslcomprising A'a casing, thecombination of casin'g'for suspending a plurality 'ofsheets in lateral contact with each-other,

that

- theair passes between them, heating means, and a reflector for reiecting theheat from Y' 'each other on each edges said heating meansiagam'st those portions of the` sheets engaged by the suspending means. -v 4.111 -a-sheetldrying apparatuscomprising the com-.1

a casing having guideway's therein,

l meshes desired', a concave rethe blower by making'available-tofrom the clamped portions of Ysheets'- at and adjacent vmeans for blowing aircurrents l 'iin witness whereof have hereunto signed directing air currents against the ysheets causing them to spread so that'the air passes between, them,

' apparatus compris- Itoqseparate soi that the air them, heating means. ar-

the suspended means for directingai'r'currents upwardly andv against the 'sheetslcausing them to separate so means -orheatings'aid sheets 4at and adacent said clamping mams, I A

5' af site@ g all' Matus Comprising a casing havingguldeways there1n,' the ombinationoir apluralityot carriers movable on'said guidewaya' means for clamping a plurality oit sheets in each other von' each-oiQ said carriers, means fior directing air currentsjagainstgthe tree edges otsaid sheets, causing .them to separate so that the air passes hetween them', heating means, and an insulated redentor tor re,`

lateral contact with idecting heatrrom said heating 'means against' those-portiers' oit the'sheets at 'and adjacent said clamping means-,

6, ln a sneerJ drying apparatus comprising l a casing, the'combination oi a carrier' in said casing, meansY for clamping 'aj plurality 'oli sheets on'said carrier, means torhe'ating said currents 'against the free edges of said sheets, causing them to sep! arate-'so 'that the 'airpa'sses between thei'n.,l and aheater arrangedfin the path of. said my name,

diddl" suspending' a plural-ity of means for directing means in said i bination'of'a vplurality of carriers 4movable f on said -guideways,

in. lateral Contact with for; directin of sai so' that 4the air' air currents against the lfree passes. between them, and

'of .said carriers, means f sheets causing them to separate Y said-clamping means, I

. ,asma atm-Sterf lies ' ila

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