US2574085A - Extraction drier - Google Patents

Description

Nov. 6, 1951 J. T. BIAN EXTRACTION DRIER Filed Ndv. 1, 1947 2 SHEETSSHEET l 1951 J. T. BIAN 74,

EXTRACTION DRIER Filed Nov. 1, 1947 2 SHEETS-SHEET 2 Patented Nov. 6, 1951 EXTRACTION DRIER:

John T; Bian, Chicago, Ill., assignor to thepartnership composed: of John T. Bian, Anthony Zwissig; William. J. Spcllman, Burton. H. Williams, Ernest..Booth, and Thomas V. Mc-

Davitt Application'November 1, 1947, Serial No. 783,509 4 Claims. (01.. 219-19.)

This invention relates to a drier and more par ticularly to adrying means for drying a printed web of paper as it comes off a rotary press."

In the operation of modern high speed rotary presses, a web of paper is printed upon both sides and then passed immediately to a folding or cutting machine. In the folding or cutting operation sheets are piled one upon the other-and diiliculty has been experienced in that the wet ink on the paper tends to smudge. The methods employed for drying the ink generally consist of a line of gas flames over'which' the paper is passed rapidly and the ink flash dried. Any-maladjustment of the speed of thepaperover the flame or the intensity of the flame, results in either poor drying of the ink or in overdrying', even to the extent of igniting the paper; Infact, fires'are extremel common in press rooms.

I have invented" and am herein disclosing and claiming a novel means and method for drying printed paper which comprises, broadly; passing the moving web through an open ended. boxlike heating chamber and subjecting the web to radiant heat on both sides as it passes through the chamber.

The invention will be described as disclosedin.

the embodiment shown in the accompanying drawings in which Fig. 1 is a diagrammatic view of the drier and a portion of a rotary press. Fig. 2 is a vertical section through the drier and Fig. 3 is a horizontal section along line 33 of Fig. 2.

Referring now to the drawings, It] indicates a drier through which a moving web of printed paper i I is passed after coming from drums l2 and E3 of a rotary press. opposite ends of the drier l serve to align the web for its passage through the drier. Additional rollers it, I! and I8 conduct the dried web to a folding or cutting machine (not shown). The drier IE3 is an open ended boxlike chamber having side walls [9 and top and bottom walls and 2|. The walls are insulated with suitable insulating material 22 whose interior side is covered with a reflecting means 23 such as tinfoil. The web ll enters the drier through the open end 24 and leaves through the end 25 which is partially closed by an upstanding end wall 26 forming a pocket 21 immeditely interior of the end wall.

Shortly after entering the entrance 24, the upper surface of the web is subjected to radiant heat from a first heater 28. The heater extends transversely across the entire chamber l0 and comprises a pair of spaced parallel electrical resistance elements 29 and 30. A copper screen 3| is attached to the heating elements 29 and 30 Guide rolls l4 and I5 at the web to apply heat to the under side thereof.

The second heating element comprises three electrical resistance elements 33, 34 and 35. The elements'33 and 34 are positioned relative to each. other to form a V as shown while the third element, 35, is located adjacent the exit 25. A secondcopper screen 35' is connected to all three elements. The screen 36 has its front edge immediately beneath the rear edge of the heating element 3!) so that it forms a radiant heat member in the shape shown, which is analogous to a truncated V. The various heating elements receive their energy through conduits 3'! which are connected with a sixty ampere magnetic relay 38 in turn connected to a sixty ampere fused switch 39 and then by conduits 40 to a 230 volt line (not shown). A manually operable switch 4| is provided in the circuit.

If desiredpthe web exiting from the heating means may be air-wiped by means of the perforated pipe 42 connected by means of the pipe 43 to a source of compressed air.

In the installation made, the drier was positioned very close to the last rollers of the press, the distance from the entrance 24 to the rolls 1! and [3 being approximately 36 inches. The length of the chamber was 64 inches and its overall height 9 inches. The outside width of the chamber was '74 inches. The copper conducting screens together with the resistance elements were approximately one inch from the insulation 23. The copper screens were therefore approximately two and one-half inches from the web and were 16 gauge and one-half inch mesh. The temperature beneath the first heating element 28 was maintained at approximately F. while the temperture at the center of the drier was held at F. In the pocket 21 the temperature reached 230 F. The printed Web travelled at a rate of 450 feet per minute and during its passage through the drier the ink was dried to a degree which permitted subsequent cutting and folding without smudging the ink. The temperatures may be varied somewhat with changes in the speed of the paper and the particular ink being dried.

An important and additional advantage of the use of my drier is that it eliminates practically all of the static electricity with which the paper has been charged during its passage through the press. Static electricity causes the printed web to stick during the cutting and folding operations While I have shown and described my inven tion in its preferred embodiment, it is to be un. derstood that it is capable of many modifications.

Changes, therefore, in the construction and arrangement may be made Without departing from the spirit and scope of the invention asdisclosed in the appended claims. j Having described my invention, I claim: 1. A drying means for drying a moving printed web from a printing press comprising an open ended chamber through which the web passes, a first heated element within the chamber above the web and a second heated element within the chamber and below the web, said heated elements comprising foraminous members extending transversely across the path of the moving web, electrical heating members contactingsaid elements along their margins for heating the same and an upstanding end wall at the exit end of said chamber adapted to form a pocket of air having a higher temperature than the balance of air in the chamber adjacent said exit end, said web being unsupported during its passage through the chamber whereby both faces of the web are entirely exposed to radiant heat from said elements.

2. A drying means for drying inkon a moving printed continuous web from a printing press comprising a chamber having a top, a bottom, and sidewalls, and having open ends, means for passing the web through the chamber from end to end, a foraminous element in the chamber above the Web, a second foraminous element in the chamber beneath the web, means for heating the marginal edges'of the elements, said elements being heat conductors and each'of said elements being wider than the web and extending across the chamber from side to side, said Web being unsupported during its passage through the chamber whereby both faces of the web are entirely exposed to radiant heat from said elements.

4 3. A drying means for drying ink on a moving printed continuous web from a printing press comprising a chamber having a top, a bottom,

and sidewalls, and having open ends, means for passing the web through the chamber, said web being substantially unsupported during its passage from endtoend of the chamber, a metallic screen in the chamber above the web, a metallic screen in the chamber beneath the web, each of said screens being wider than the web and extending across the chamber from side to side and electrically heated members in contact only with the marginal edges of the screens for heating the screens by conduction of heat therefrom whereby both faces of the Web are entirely exposed to radiant heat from said elements.

4. Apparatus of the character described in claim 3 in which said first screen is substantially rectangular in shape and said second screen is in the shape of a V, and in which said electrically heated members are in the form of relatively narrow strips contacting the marginal edges of the screens.

JOHN T. BIAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Date Number Name v 1,178,556 Tompkins Apr. 11, 1916 1,401,303 Baldwin Dec. 27, 1921 1,421,166 Cannon June 27, 1922 1,484,324 Emerson Feb. 19, 1924 1,580,957 Chafie et al. Apr. 13, 1926 1,656,709 Kelley Jan. 17, 1928 1,656,824 Marans Jan. 17, 1928 1,741,882. Robinson Dec. 31, 1929 1,964,573 Hanson June 26, 1934 1,983,995 Reinhardt Dec. 11, 1934 2,165,970. Jaspers July 11, 1939 2,445,443 Long July 20, 1948 2,508,357 Ames May 23, 1950 FOREIGN PATENTS Number Country Date 187,739 Great Britain, Nov. 2, 1922

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