US2369800A - Application of prepared adhesive to webs - Google Patents

Description

Feb. 20, 1945. o. c. ROESEN APPLICATION OF PREPARED ADHESIVE TO WEBS Filed Oct. 9, 1941 n x me T0 2 w. M m 0 5 ATTORNEYS use by web-consuming apparatus.

Patented F eb. 20, 19 45 UNITED STATES PATENT oFF-Ica zssasoomucarron or PREPARED ADHESIVE a -ro wuss Application October 9, 1941, Serial No. 414,274

3Claims.

.This invention relates to the application of coatings to webs of papenor like flexible sheet ma terial, and more particularly concerns improvements in the application of prepared adhesive and other coatingsto the surfaces of such webs while continuously winding them into rolls for One operation in which my invention is. useful is the application of adhesive coatings, and in certain cases adhesive-repellent coatings, to, an

area of paper or other web which lies at or adjacent the central core end of the web on a web roll. I-have heretofore devised a method and apparatus for splicing the web running from an expiring web roll to the leading end of the web on a new roll which involves the application of an adhesive, and, in some cases an adhesive repellent, to areas adjacent the inner or core end of the web on the roll. The method and apparatus so devised are described in detail-in my copending application Serial No. 403,515. filed July 22, 1941, now Patent No. 2,320,656. In accordance with the invention disclosed in that application, I

layers of a special self-sticking adhesive are located respectively atth'e outer or leading end of the web and at or adjacent the inner or core end of the web on each roll. The self-stickingadhesive layers must be applied in liquidform and thereafter dried until their surfaces do not adhere to an uncoated' web surface. The outer or leading end adhesive layer may be readily applied to the new web roll after itis wound up, either by applying the adhesive'directly to the web on the roll it thereon, vor by. splicing to the leading end of such web a short web section carrying the desired adhesive layer. The complementary adhesivelayer at or adjacent the inher or core end of the web on the roll obviously cannot be applied afterthe roll is wound up, and

the application and drying of this material or of other coatings while the roll is being wound sometimes pres'ents dimculties Paper W118 are customarflrformed by the inner or core end of the web on the rollc.

winding the web, emerging from thecalender or other final finishing device of a paper making. machine or the web from a large parent roll onto suitable cores, the web being severed when each roll reaches the desired sizeand the severed end of the webbeing started Dna'new core without 50 opposite that bearing the adhesive, the repellent coatingpre'ferably extending slightly beyond the adhesive coating toward the core end of the web interrupting the continuous and rapid movement ofthe web. It is essential to convenient handling and economic production that the web move continuously to the winding device and that its speedof travel .be maintained uniform throughout the Q terial to which the coated sheets are. applied may winding operations-and while the web is shifted from a completed-roll to a new core.

In accordance with the present invention, the

self-sticking adhesive layer or other similar coat- 5 ing tobe applied in liquid iorm and dried before winding the roll, isapplied to and dried on thin sheets of paper or like material, and one of these sheets is secured to the web surface as it travels at a high velocity to the roll winding device. The invention also contemplates the provision of a control mechanism that acts to correlate the application of-the prepared coating-carrying sheet with the starting of anew roll so that the coating x isdisposed at or adjacent the inner or core end of the web on each roll. x

Other objects, advantages and characteristic features of the invention will be pointed out or .will become apparent as the description of the disclosed embodiment thereof progresses. In describing the invention in detafl, reference will be made to the accompanying drawing in which a typical embodiment thereof has been illustratech In the drawing:

accordance with the invention;

Figs. 2 and 3 are simplified elevations, showing the roll-winding mechanism in different, operatso ing positions;

- Fig. ,4 is a perspective view of the cylinder em- I played to apply the prepared coating-carrying sheet to the web; and

- Fig. 5 is an edge view of a coating-carrying sheet.

The present invention contemplates the application of a prepared coated sheet to at least one 1 surface of a rapidly moving web running to a roll.-

winding device and the synchronization of the 40 application of such coating with the transfer of the web from a completed roll to ecore of a new roll in such' fashion thatthe s ctionoffthe web bearing thecoated sheet lie 'at or adjacent ;.ly1henthe coating comprises an adhesive, the prepared sheet is preferably applied to that surface of the web which becomes the innersurface of I each tum. of the wound roll. In certain cases, an

adhesive repellent is applied to-the web surface on each-r611 for a purpose hereinafter explained;

be supplied from a paper-making machine generally indicated at F'in Fig. 1, or from a large parent roll 8. I have illustrated at I the usual drying drums of the paper-making machine F which may be of the Fourdrinier type. The paper web 9 is continuously formed in a known manner by the machine, and is dried onthe drums I from which it passes to the usual calender C where its surface is finished.

The rapidly moving web 9 issuing from the calender C or from the parent roll 8 is guided by suitable rollers, Ill, I l and !2, past an adhesive sheet applying device designated S and to be described, to a roll Winding device designatedR. The device R may take any suitable form and generally is so designed that it winds the web 9 into a succession of web rolls of the desired size, severing the web running to a substantially completed roll and starting the severed end on a core to start the winding of a new roll without interrupting or retarding the rapid continuous movement of the web. .Various forms of web roll winding devicesfor accomplishing these functions are known, and any of such known forms may be used within the scope of the present in? vention.

The winding device R illustrated is of the type generally termed a Pope rewinder and since its construction and operation are well known, it will be but generally described herein.- The details of such a, device are set forth in the Pope Patent No. 1,248,542. As illustrated in Figs. 1, 2 and 3, the device R includes an under roll i4 which is suitably driven at a speed such that its prising the arms l9 pivoted at a point above the axis of the under roll M and a running frame comprising a pair of arms 2|] pivotally supported in the bed frame 2| at one side of the under roll H. The arms l9 have bifurcated ends 2l constructed to receive the joumal' boxes l8, and the arms 20 have recesses 25 for receiving and engaging the core roll journals [1 as shown in Fig. 3.

In operation, while a web roll 26 is being wound on one of the core rolls I5 whose journals I! are carried by the running frame arms 20, a second core roll i6 is placed in the starting frame arms [9 and disposed in the ready position as shown in Fi 1 with the core surface out of contact with 1 the web passed over the under roll I. When the web roll 26 has reached the required size, the arms l9 are swung back to the starting position (Fig; 2) so that the core roll l6 engages the moving web backed by the under roll l4 and the core is acthe recesses of the running frame arms 20. As thenew roll 23 builds up, the journal boxes l8 are lifted from the bifurcated ends 2'1 of the starting frame arms 19 whereupon these arms are swung back to the ready position (Fig. l) to receive a new core in preparation forthe next web transfer operation, thus completing the cycle.

The device S acts to apply to the web 9 a prepared sheet (Fig. 5) carrying an applied and dried coating 3| on the surface thereof which becomes the exposedsurface when the sheet is secured to the web. The sheet may be formed of any thin flexible material such as thin paper, thin transparent sheets of degenerated cellulose or cellulose derivatives or the like. The coating 3! may comprise any coating material which is applied in liquid form and dried. The invention is particularly applicable to the preparation of paper web rolls for use in printing presses, and in such' application, the coating 3| preferably comprises a self-sticking adhesive such as a rubber cement. Such materials are described in detail in my Ycopending application Serial No.

403,515, referred to above. As there explained,

adhering tenaciously to a paper or other web when applied thereto in liquid form, but when The under roll l4 coop-' celerated to web' speed by such engagement. The

web is then severed at a point between the core l3 and the completed roll 28, preferably by a blast of compressed air issuing from a nozzle 21 and directed beneath the edge of the web carried on the under roll I l, andthis air blast, aided if starting frame arm is are swung in the direction of web travel to the transfer position (Fi 3) in which the journals ll of the core I 6 rest in dried, do not adhere to an uncoated web surface. After the self-sticking adhesive is applied and dried, it 'coheres' tenaciously with a similarly applied and dried coating.

The coating 3i may be applied to the sheet til in any desired manner as by spraying or by wiping from a blade, roller or the like. The applied coating is dried on the sheet by exposure to heated air currents or in any other known fashion. A tacky adhesive 32, which may comprise rosin glue, paste or the like, is applied to a part or all of the surface of the sheet 30 which engages the web 9. The tacky adhesive may be applied before the sheet is placed on the applying device S or afterward.

Referring now to the sheet applying device S. it includes a large diameter light-weight cylinder 33 rotatably mounted with its cylindrical surface adjacent one surface of the web 9 and its axis extending transversely of the path of web travel. The cylinder 33 is preferably driven at a speed such that its peripheral velocity equals or sub-z stantially equals the web speed, and this may be accomplished by a driving connection, diagrammatically illustrated at 34, between the cylinder shaft and a driven web engaging part of the paper machine or the drive for the parent roll 8, A clutch or the like, illustrated at 34', is preferably included in the driving connection for the cylinder 33.

The web 3, guided by the idler rollers II and I2, is normally spaced from the surface of the cylinder 33 as shown and a movable press roller .mounting the roller 35 in a vertically movable frame carried or propelled by apiston 36 in a fluid pressure cylinder 31. The operation of thepiston 36 is governed by a solenoid operated valve 33 which when opened by energization of .its solenoid 39 admits compressed air or other pressure, fluid from a suitable source to the cylinder 31 and so lifts the piston 36 and the press ingroller 35 with the result that the web pressed against the cylinder 33.. Upon de-energization of the solenoid 39, the valve 38 cuts oif the fluid pressure and vents the cylinder 31 so that the roller 35 drops and the web 9 is retracted from the cylinder 33.

Compressed air is supplied to the nozzle 21 and 23 of the windin device R under control of a valve 40 operated by a solenoid 4| which opens the valve when energized. The solenoids 39 and 4| may be simultaneously energized from a circuit running from a source of energy illuss trated by the positiveand negative signs, through a manually operable push button switch 42,.wires 43, 44, 45 and 46, a timing switch 4'! controlled by the angular position of the cylinder 33, and a wire 48.

While the web 9 is travelling to a roll such as the roll 28 on the winding device R,'the cylinder 33 is stopped by opening the clutch in its driving connection and a sheet 30, prepared as explained above, is removably secured to the cylinder surface in the manner to be described. The surface of the sheet 30 that engages the cylinder surface carries the dried coating 3 I, which may be a selfsticking adhesive. The sheet 30 is preferably approximately a wide as the web 9, and is of suflicient length to form a coating extending along the required length of web. The circumference of the cylinder 33 is appreciably greater than the length of the sheet 30 so that a portion of the cylinder surface is left bare as shown-at 58. The sheet may b removably secured to the surface of the cylinder 33 by any known suitable means. In the disclosed embodiment, each end of the sheet 30 is secured to the cylinder by frangible summed tabs but a weak adhesive between the under surface of the sheet and the cylinder surface may be used if desired. The

circuit across the timing switch 41 through the wires 60 and BI and the contacts 62 which are closed upon energization of the solenoid 41. As

' the cylinder 33 rotates, the outer surface of the opposite ends of the tabs 51 illustrated are respectively stuck to the outer surface of the sheet ends and the adjacent cylinder surface, and a weakened portion such as a line of perforations .52 separates the tab ends so that the tabs tear along this line and release the sheet from the cylinder when the sheet is stuck to the web 3. Frangible tabs of this type are described in detail in U. S. Patent No. 1,996,497.

The timing switch 47 is arranged to close the circuit between the wires 46 and 48 only when the bare section 50 of the cylinder 33 is opposite the pressing roller 35. As shown, this maybe accomplished by providing a conducting segment 53, electrically connected through-the roll shaft or otherwise to the wires and 43 and engaged byv a stationary contact 54 connected to the wire 48. The sector 53 is diametrically opposite the bare section of the cylinder 33 and is of equal angular extent thereto.

With a prepared sheet 30 removably secured to the cylinder 33, the driving connection for the cylinder is established and the cylinder isaccelerated to web speed. When the roll 26 has reached the desired size, the'operator closes the push button switch 42 and holds it for an inter-.

val. As soon as the bare section 53 of the cylinder surface is tangent to the moving web 3, the timing switch 41 closes and the solenoids 39 and 4! are energized. Energization of the solenoid 39' results in upward movement of the pressing roller 35 whereby the web 9 is firmly pressed against the bare surface of the cylinder 33. Energization of the solenoid 4| severs the web 9 on the Winding device R and transfers the severed end thereof to a new core I6 to start winding a. new roll as explained above, and closes a. holding sheet 30 carrying the tacky adhesive 32 is pressed on and stuck to the web 9,. the frangible tabs 51 are broken and the sheet 30 peels off the cylinder 33 and travels along with the web. This places the coated sheet adjacent the inner or core end of the web forming the roll wound on the core IS. The described operation may be repeated each time the web -is transferred to a new core to start winding a new roll.

If necessary or desirable, the tacky adhesive 32 may be dried by hotair or other known means acting in a stationary drier 49 surrounding the web between the sheet-applying device S and the winding device R. 1

A web carrying a dried coating of the selfsticking adhesive referred to above may be wound into a roll without adherence between the coated surface and the uncoated surface of the superposed layers. Since adhesives and coatings other than the described self-sticking adhesive might be used, and in any case to positively insure against adherence between adjacent roll layers, it is frequently advisable to apply a repellent coating to the opposite surface of the web 9 from that carrying the prepared dried coating. The repellent may comprise an adhesive repellent such as paraiiin or any other suitable wax or wax-like composition, and it is preferably applied in solution and dried by the drier "49.

Since the coating onthe sheet 33 is applied to the web surface which becomes the inner surface of each layer on the roll, the repellent coating repellent to the under surface of the web 9 by a device identical with the prepared coating sheet applying device S described above. It is generally simpler however to spray the repellent onto the under surface of the web 9 as illustrated from a reservoir 53 through a spray nozzle blunder control of a solenoid 58 which when energized opens a valve 59 and supplies compressed air to the nozzle 57. The solenoid 58 is connected as shown in parallel with the solenoids 39 and ti and accordingly is energized simultaneously therewith. The nozzle 5? is spaced ahead of the cylinder 33 a distanc sufiicient to provide the required lead of-the repellent coating over the adhesive-carrying sheet 33, for the purpose explained above.

From theforegoing description it will be seen that by employingthe present invention, a prepared and dried coating of adhesive or other material may be applied to a moving web surface in predetermined relation to thecoreend of a web roll during winding of the roll and without in= terrupting or retarting either the production or feeding of the web for'the winding operation.

Iclaim:

1. A method of applying adhesive sheets to a continuously moving web while winding the same into web roll with the adhesive sheets adjacent the core end of each roll comprising propelling the web to a roll being wound, moving a sheet carryinga dried adhesive coating on one surface thereof and a tacky adhesive on the other surface into web rolls with the adhesive sheets adjacent the core end of each roll comprising propelling the web to a roll being wound, moving a sheet carrying a dried adhesive coating on one surface thereof and a tacky adhesive on the other sur-' face thereof at substantially the speed of the web in th direction of web travel with the tacky adhesive carrying surface of the sheet adjacent one surface of the web, pressing the sheet and the web together to stick the sheet onto the web and simultaneously applying an adhesive repellent coating to the other surfaceof the moving web and transferring the moving web to a core to start winding'a new roll.

3. A method of applying adhesive sheets to a continuously moving web while winding the same into web rolls comprising propelling the web to a roll being wound, moving a sheet carrying a dried adhesive coating on one surface thereof and a tacky adhesive on thecther surface thereof at substantially the speed of the web in the direction of web travel with the tacky adhesive carrying surface of the sheet adjacent one surface of the web, pressing the sheet and the web together at a predetermined point in the web path to stick the sheet onto the web and simultaneously applying an adhesive repellent coating to the other surface of the web from a fixed point adjacent the web and in advance of said predetermined point in the direction of web travel and transferring the movingweb to a core to start winding 9. new r011.

OSCAR C. ROESEN.

Images