Патент USA US2127956код для вставки
Aug. 23, 1938.. R. HELMER 2,127,956 METHOD ‘AND APPARATUS FOR DRYING PRINTING‘ INK Filed Dec. 26. 1935 3 Sheets-Slieet 1 INVENTOR w/mas _' BM“ ATTORNEY ' Aug. 23, 1938. 2,127,956 R. HELMER LZETHOD AND APPARATUS FOR DRYING PRINTING’ INK Filed Dec. 26. 1935 3 Sheets-Sheet 2 MENTOR BY ATTORNEY ‘ Aug. 23, 1938. 2,127,956 " R. HELMER METHOD ANIS APPARATUS FOR DRYING PRINTING’~ INK Filed Dec. 26, 1935 ' 3 Sheets-Sheet 3 hm. ‘$4 m. - INVENTOR ATTORNE $49 Patented Aug. 23, 1938 I 2,127,956 UNITED STATES PATENT OFFICE 2,127,950 METHOD AND APPARATUS FOR DRYING PRINTING INK Robert Helmer, Douglaston, N. Y., assignor to ‘ The International Printing Ink Corporation, New York, N. Y., a corporation of Ohio Application December 26,1935, Serial No. 56,244 12 Claim. (01. 34-48) This invention relates to a method and ap paratus for drying printing ink, and aims to ac celerate the process of printing. There are now available so-called “quick dry 5 ing" printing inks whose vehicles consist of a binder dissolved in a solvent whose vapor pres sure curve is such that the solvent is. substan tially non-volatile at ordinary room temperature (‘about 25° C.) and becomes a highly volatile 1o liquid at temperatures of about 150° C. The cus tomary method of drying such inks is to apply printed matter in the form of hot gas or radiant heat, or most desirably both, and the period of application of the heat to each part of the“ sur face of the printed matter is limited by relative movement between the heat-applying means and 5 the printed matter. I ‘My invention includes also apparatus by means of which my method may be carried out em-_ ciently and safely. , In the form which I now consider most desira- 1o ble, the apparatus includes a closed furnace, one heat to the paper on which the 'ink has been - wall of which is provided by a traveling web of printed to raise the paper and ink to a tempera ture of about 150° C. This temperature is will 15 cient to vaporize the solvent in the ink and in suf?cient to injure the paper. In carrying out this method, it has been customary to heat the paper from the back or unprinted side, usually, by contact with a solid heat-conducting member so such as a hot metal drum,_or by means of hot air. In both cases, the temperature of the heating means (hot drum or hot air) has been limited to a temperature which cannot injure the paper. This limitation of the temperature of the heat gg applying means makes. it necessary to apply the heat for a substantial period in order to raise the paper and the ink to the temperature at which the solvent in the ink is highly volatile and to volatilize the solvent. _ I have discovered that, on the application of intense heat to printed matter consisting of paper printed with a quick drying ink of the type re ferred to, the period of time required to raise the solvent in the ink to the temperature at 35 which it volatilizes rapidly and to volatilize sub stantially all of the solvent in the ink is ma terlaliy shorter. than the time required to char or burn the paper. My method consists in dry ing printing ink by the'application to the printed 40 matter of a heat so intense‘that it is capable of raising the temperature of the paper far above its scorching point, while at the same time limit ing the period of the application of such heat to a time which is sufficient to volatilize substan , 45 tially all of the solvent of the ink and less than the time which would be required to char or burn the paper. The heat applied in this method may be above the ignition point of the vapor of the ink solventfso that at least somev of the solvent 50 vapor from the ink is ignited and burned, but neither the paper nor the binder in the ink which binder may be highly‘ in?ammable is burned or otherwise injured. In accordance with my invention, the intense 55 heat is vapplied to the printed surface of the paper bearing the ink to be dried. The oppo site wall of the furnace carries the heat-apply ing means which direct an intense heat against 15‘ 4 the printed surface oi’ the web. This wall is so arranged that it may be opened to direct the heat-applying means away from the web in order to avoid scorching the web when the web is sta tionary. The'opening means are most desirably 20 operatively connected with the means for caus ing the travel of the web across the furnace in such a way that opening of the furnace occurs automatically when the movement of the web is stopped. _ 25 A specific embodiment of the apparatus fea tures of my invention is illustrated in the ac~ companying drawings, in which Fig. 1 is a side elevation of the complete ap paratus, omitting parts of the printing press 30 which are of standard construction and show ing the furnace in longitudinal section; Fig. 2 is a diagrammatic view containing an enlarged side elevation of the furnace taken from the opposite side from Fig. 1 and an en- 35 larged side view of the means for supplying gas and air to the furnace, and showing the elec trical connections; ' Fig. 3 is an enlarged transverse section of the furnace taken on the line 3-3 of Fig. 1; Fig. 4 is a further enlarged section taken on the line ll-4 of Fig. 3 and showing the details of one of the burners, and indicating in dotted lines the position of this burner when turned away from the web; . _ 45 Fig. 5 is an enlarged section taken on the line 5-5 of Fig. 1, showing the air control valve, and Fig. 6 is a diagram of the electric control. The apparatus illustrated includes a printing 50 press. iii of standard construction for printing on a web P of paper. Ink is applied to the web of paper P in the press. The web'emerges from the press over a roller H with its printed side uppermost, and, after the drying of the ink by 66 2 2,127,9oe the apparatus to be described, the web P is wound up on a rewind roller I2 which constitutes a part of the printing press. The rewind roller and the other rollers of the press are driven by a three When the furnace is closed, the burners 36 direct intense heat toward the printed surface of the web P, which would char and burn the web if any portion of the area of the web were The customary means are pro~ exposed to it for more than a very brief period of time. It is, therefore, essential that this sup vided for regulating the speed of the press which determines the speed of travel of the web P. ply of intense heat to the web be stopped when the'movement of the web is stopped. This may phase electric motor indicated diagrammatically at l3 in Fig. 2. In its travel between the guide roller I I of the 10 press and the rewind roller I2 of the press, the web P passes over guide bars I4 and rollers I5, l6, II, l6 and I9 mounted on a frame 20. A furnace 30 is mounted on horizontal bars 2| of the frame 26 above and adjacent to a portion of the web traveling between the rollers II and IS. The furnace is enclosed by side walls 3|, end walls 32, 32'". a top wall 33, and the portion of the web P between the end walls 32 which constitutes the bottom wall of the furnace. The end walls 32 and 32’ terminate a short distance above the surface of the web. The top wall 33 contains three doors 34, which carry series of radiant gas burners 35 which are directed to wards the web P when the doors 34 are closed. Each row of burners 35 is mounted on a pipe 36. Each pipe 36 is attached at one of its ends to a supply pipe 31 through a stuffing box 36 in such manner that each pipe 36 may be rotated about its own axis. Each pipe 36 thus serves as a 30 pivot about which one row of burners 35 and one door 34 may be rotated between a position in which the doors are closed and the burners are directed towards the web P (shown in full lines in Figs. 1, 3 and 4 and in dotted lines in Fig. 2) and a position in which the doors are open and the burners are directed away from the web (shown in dotted lines at the top of Fig. 2 and in dotted lines in Fig. 4). Means are provided for simultaneously open 40 ing and closing the three doors 34 and for swing ing the three rows of burners 35 away from and towards the web. Such means include radial arms 66 fixed on the pipes 36, and connected by links to a swinging bar ‘I0 provided with a han 45 dle ‘I0’, so that, when the bar ‘I0 is in the posi tion shown in full lines in Fig. 2, the pipes 36 be accomplished in the form of apparatus illus trated by rotating the pipes 36 to open the doors 10 34 and direct the burners away from the web. It is desirable that automatic means should be provided for opening the furnace when the web is stationary and closing it when the web is put in motion. Such means are illustrated in Fig. 2 15 and Fig. 6. Fig. 2 shows diagrammatically the main switch 66 of‘ the press I0 motor l3 of the When ‘the switch tionary and, when which serves to connect the press with supply lines 6|. 60 is open, the web is sta 20 the switch 60 is closed, the web is put in motion by the motor I3 which drives the rewind roller I2 and the other rollers of the press. The closing of the switch 66 energizes a con 25 trol circuit 62 having two parallel branches one of which, 63, controls a small motor 66 carrying a pinion meshing with a gear I3 fixed on the middle one of the pipes 36. When the circuit 63-is energized by closing the switch 66 with 30 the furnace open, the motor 66 acting through the gear ‘I3 turns all the pipes 36 to swing the burners downward towards the web and to close the doors 34. Thus, the furnace is closed and the burners directed towards the web when the web is put in motion by closing the switch 66 and energizing the motor l3. If the web is stopped by opening the switch 60, or by any means cutting off the current from the motor I3, the circuits 62 and 63 are tie-energized. 40 This causes operation of the motor 66 in the reverse direction to open the furnace and direct the burners away from the web. Details of the mechanism which controls the motor 66, are shown in Fig. 6. The circuit 63 45 contains an electro-magnet 61 and this magnet are turned so as to close the furnace and direct and a spring 68 control the position of a re the burners towards the web P and, when the bar ‘I0 is swung to the position shown in dotted lines in Fig. 2, the pipes are turned into a posi versing switch 69 connected between the motor 66 and a supply line 90. Rotation of the motor 66 in either direction beyond the points at which tion in which the furnace is open and the burners are turned directly away ,from the web. Each of the burners 35 includes a nipple 39, a de?ector 40, and a parabolic radiator 4| of it directs the burners towards and away from 55 refractory material which is heated to incan descence by the gas flame issuing from the nipple and serves to direct the ?ame and radiant heat along the axis of the burner and, therefore, di rc :tly, against the web when the burner is turned towards the web, as shown in Fig. 4. A mixture of gas and air is supplied to the burners through the pipes 36 and supply pipes 3‘I from a mixing chamber 42. The gas and air are supplied under pressure to the mixing cham~ 65 her and the burners by a centrifugal pump 43, which draws air from the atmosphere through a pipe 44 and gas from a gas main 45. After passing under and across the furnace 30, the web P passes through a suction duct 50 70 formed by an upper wall 5|, a lower wall 52, an end wall 53, and the end walls 32’ of the fur nace. The suction duct 56 is open at one side of the furnace and at the other side is con nected to a conduit 54 containing an exhaust 75 fan (not shown). the web is prevented by the opening of switches 8|] controlled by cams 6| mounted on the middle pipe 36. In order to save fuel, it is desirable that the supply of gas to the burners be reduced when the furnace is opened. For this purpose, an automatic electric valve ‘I5 of standard construc tion is placed in the gas supply pipe and con nected in a branch 16 of the circuit 62. The 00 valve ‘I5 is opened only‘ when the circuit ‘I6 is energized. Closing of the valve ‘I6 by de—energiz ing the circuit ‘I6 also closes a butterfly valve ‘IT in the air pipe 44 which is connected to the mechanism of the valve ‘I5 by a link 18. To prevent extinguishment of the burners when the valves ‘I5 and ‘II are closed, a small by-pass ‘I6 is provided around the valve 15 and a small‘ opening 60 is provided in the butter?y valve ‘II. This by-pass and this opening insure a sufficient supply of air and gas to the burners to keep them ignited and the refractory radiators in candescent when the web is stationary and the burners are turned away from the web. A specific example of the practice of my 2,127,966 method by means of the apparatus as described is as follows: An ink whose vehicle consists‘ of a solution of a binder such as nitrocellulose in a volatilizable solvent such as diethylene glycol monobutyl ether or diethylene glycol monobutyl ether acetate is applied to the upper surface of the web P in the press to. As each successive part of the web is drawn through the furnace 30, intense gaseous and radiant heat are directed 10 against the printed surface of the web by the radiant gas burners 35. The solvent- in the ink is vaporized and ignited as the web passes through the furnace. The products of’ combustion are drawn out of the furnace under-the end wall 15 32' and through the suction duct 50, so that they do not contaminate the air of the press room. Any vapor which may come off the web after it leaves the furnace is also drawn out through the duct 50. Although combustion, both of fuel 3 2. Apparatus for drying printing ink compris ing means for causing a traveling movement of a web to which the ink has been applied, a turn ably mounted heater located adjacent to the web, and means operatively connected with the means for causing. travel of the web for direct ing said heater towards the web when the web is in motion and- away from the web when the web is stationary. v 3. Apparatus for drying printing ink compris ing means for causing a traveling movement of lo a web of paper to which the ink has been ap plied, an enclosed furnace located adjacent to the printed side of the web so that the web forms one wall of the furnace, and an automatic 15 means for opening the opposite wall of the fur nace when the traveling movement of the web is stopped. 4. Apparatus for drying printing ink comprise 20 gas and of the solvent vapor, is constantly tak- ‘ ing the combination with means for causing ing place in the furnace, the paper web is not travel of a web to which the ink has been applied, 20 burned, charred or injured in any way because of a gas burner located adjacent to a point of the period during which any area of the web is the travel of the web and mounted for rotation within the furnace is extremely short, amounting about an axis transverse the path of the web‘ 25 in practice to about one-third of a second. The so that it may be directed towards or away from 25 paper of the web is, of course, heated to a con the web. siderable extent during the passage of the web 5. Apparatus for drying a printing ink com across the furnace and the tensile strength of prising a combination with means for causing the the web might be reduced if the web were al travel of a web to which ink has been applied, 30 lowed to remain hot. The web is, however, cooled of a heater adapted to apply intense heat to the during its passage over the rollers i6, i1, i8 printed side of the web at a point in its travel, 30 (which are preferably water-cooled rollers) be said heater being mounted for rotation about an fore it is wound up on the rewind roller l2. ' When axis transverse the path of the web so that it may the travel of the web is stopped for any reason, be directed towards or away from the web. 35 the furnace is immediately opened and the burn 6. In a web printing press, apparatus for dry ers are directed away from the web so that the ing printing ink comprising means for causing a 35 web is not burned. traveling movement of the web to which the ink In the apparatus described, the radiant burn has been applied, a movable heater, and means ers 35 apply intense heat to the web both in the operatively connected with the means for caus 40 form of radiant heat and in the form of hot gas. ing travel of the web for moving said heater to This causes a very rapid volatilization of any an operative position when traveling movement 40 volatilizible solvent contained in the ink. If the is imparted to said web so that intense heat is solvent is in?ammable, a considerable part of it directed upon the printed surface of the web and is ignited and burned in the furnace. The prod to an inoperative position when the movement of nets of combustion, as well as any part of the said web is stopped. ~ 45 solvent vapor which is not burned, are drawn off 7. Apparatus for drying printing ink compris through the suction duct 50 to a point remote ing the combination with means for causing a from the web. traveling movement of the material to which the It is not essential that both radiant heat and ink has been applied, of a furnace, a heater at gaseous heat be used. I have found it satisfac tached to ‘one wall of the furnace and adapted tory to use gaseous heat only, but in this case to direct intense heat upon the printed surface of 50 burners ejecting large gas ?ames under heavy pressure are used and substantially all the solvent the material, and automatic means for opening furnace wall to which said heating element which is driven from the ink on the web is ignited the is attached. and burned. ' The drying of the ink by this method is ex tremely rapid and permits use of the method with rotary presses operating at a speed of 400 feet per minute. My invention is by no means limited to the use of the method or the apparatus with the par ticular ink which has been mentioned for the sake of illustration; It has proved effective by drying and accelerating the, drying of many 65 types of inks, including several which cannot be satisfactorily dried by the hot roll method. What I claim is: . 1. Apparatu; for drying printing ink com prising the combination with means for causing 70 a traveling movement of a web of paper to which the ink has been applied, 01' an enclosed furnace located adjacent to the printed side of the web so that the web forms one side of the furnace, and means for opening the opposite wall of the 76 furnace. 8. Apparatus for drying printing ink compris 55 ing the combination with means for causing a traveling movement of a web to which the ink has been applied, of an enclosed furnace having a heating compartment and a separate suction compartment located adjacent to the printed side 60 of the web so that the web forms'one wall of the furnace. . 9. The method which comprises printing at room temperature with an ink containing a com bustible binder dissolved in a volatilizable and in?ammable solvent which is substantially non volatile at room temperature, and then applying to printed ink through a gaseous medium heat of sufficient intensity to volatilize the ink solvent in stantaneously and ignite the solvent vapor, and 70 limiting the time of application of said heat to a period so short that the heat does not char the ink binder. 10. The method which comprises printing on a combustible material with an ink containing a 76 4 2,127,956 combustible binder dissolved in a volatilizable and in?ammable solvent which is substantially non-volatile at room temperature, moving the printed material away from the printing means, applying through a gaseous medium to the print— ed surface of the material heat of su?lcient in tensity to volatilize the solvent and ignite the solvent vapor, maintaining the material out of contact with any heated surface between printing 10 and the application of said heat, and limiting the time of application of said heat to each part of this surface of the material to a period so short that the heat does not char the material and the ink binder deposited thereon. 11. Apparatus for drying printing ink, com prising means for causing a traveling movement of a combustible web to which the ink has been applied, an enclosed furnace located adjacent to ing the furnace temperature above the combus tion temperature of the web, and means opera tively connected. to the means for causing travel of the web for reducing the furnace temperature to a temperature below the scorching tempera ture of the web when the traveling movement of the web is stopped. 12. Apparatus for drying printing ink, com prising the combination with means for causing a traveling movement of the material to which 10 the ink has been applied, of a plurality of rows of heaters adapted to direct intense heat toward the printed side of the material, each of said rows being mounted for rotation about an axis parallel with the axis of rotation of each other row so that 15 the heaters may be directed toward or away from the material, said axes all lying in a plane paral lel to the printed surface of said material. the traveling web so that its printed side is ex- . ROBERT HELLER. 20 posed to the furnace heat, means for maintain 20 CERTIFICATE OF CORRECTION . August 25, 1958. Patent No. 2,127,956. ROBERT HELPER . It is hereby certified that the name of the assignee in the above num bered patent was erroneously described and specified .as " The International Printing Ink.Corporation" whereas said name should have been described and specified as Interchemical Corporation, New York, N. Y., a corporation of Ohio, as shownby the record of assignments in ‘this office; and that the said Letters Patent should be read with ‘this correction therein that the same may conform to the record of the case in the Patent Office. ‘ Signed and sealed this 18th day of April, A. o. 1959. Henry Van Arsdale (Seal) Acting Commissioner of‘ Patents. DiSCLAiMER 2,127,956.——R0bert Helmer, Douglaston, N. Y. METHOD AND Armazxros FOR DRYING PRINTING INK. _Patent dated August 23, 1938. Disclaimer ?led May 14, 1940, by the asslgnec, Interchemical Corporation. Herebg enters this‘ disclaimer to claims 4, 5, and 12 of said Letters Patent. I [ ?cwl Gazette June 4, 1940.] '