CA1048261A

CA1048261A - Pattern pasted adhesive

Info

Publication number: CA1048261A
Application number: CA74208053A
Authority: CA
Inventors: John W. Huebschmann; William D. Swiercz; Dean H. Packard
Original assignee: Moore North America Inc
Current assignee: Moore North America Inc
Priority date: 1973-09-04
Filing date: 1974-08-29
Publication date: 1979-02-13
Also published as: JPS5072932A; GB1437590A; AR201882A1; JPS5232894B2; BR7407332D0; MX143079A; FR2245420A1

Abstract

ABSTRACT Apparatus for applying a strip of a patterned spread of adhesive transversely across a continuous web, comprises an engraved roll mounted for rotation in a pan containing a supply of adhesive and an impres-sion cylinder about which the continuous web is guided. A compressible blanket strip is removably secured to the peripheral surface of the impres-sion cylinder and is of some desired configuration and size so as to cause a corresponding adhesive configuration and size to be successively impressed upon the web as the blanket moves the web into contact with the adhesively wetted engraved roll.

Description

l~lis inven~ion relate~ generally to an adhesive applying appara-tUsJ and more particularly to such an apparatus wherein at least one strip of adhesive may be successively applied transversely across a moving web with the use of only two cooperating rolls.
In the produc~lon of continuous business forms such as series-connected envelopes and the like, i~ is necessary that strips of adhesive be successively applied along a continuous web ~o thereby form either the con-fines of an envelope as two webs are pasted togetherJ or to provide pockets and ~he like for insert materlal.
In accordance with the presen~ invention, there is provided -apparatus for applying a strip nf a patterned spread of adhesi~e transversely across a continuous webJ comprising a rotatably mounted engraved roll, a pan moun~ed at one side of said roll and containing a quantity of adhesive for applying same to said rollJ an impresslon cylinder about which the continuous web is guided between said cylinder and said roll, said cylinder being ro-tatably mounted and slightly spaced apart fTom the periphery of said roll, a compressible blanket strip removably secured to the peripheral surface of said cyllnder and lying along the rotational axis thereof, said blanket strip having an outer surface dimension less than the surface dimension of said peripheral surface and having a thickness sli~htly greater than the spacing between said roll and said cylinder, whereby a corresponding size of adhesive strip is successively impressed upon the web as said blanket strips moves the web into contact with the adhesively wetted engraved roll upon rotation o~
said roll and said cylinder. ~lus, a simple approach is made in applying a ~`
strip of adhesive successively across a moving web by using a gravure process of applying the strips of adhesive from an in~aglio or engraved cylinder. The engraved surface of the cylinder is wetted with an adhesive, and an impression cylinder guides a continuous web for movement between such cylinder and the intaglio roll. A strip of a compressible blanket is removably secured to the periphery of the impression cylinder and, upon rotation o~ the cylinder, the ~eb is moved into contact wi~h the adhesively wetted engraved roll to thereby successively apply strips of adhesive corresponding to the configuration and : :-~ ...

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size of the blanket strip, .
Preferably the perlphery of the lntaglio roll is engraved with 10 ~o 15 lines per inch definlng quadrangular cells having stralght sides per- :
pendicular to the peripheral surface of the roll. ~:
A particular embod:iment of ~he present invention will now be described, by way of example~ in conjunction with the accompanying drawings wherein:
Figure 1 is an end elevational view of the apparatus in a.ccordance with the invention;

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Figure 2 is a view simiLar to Figure 1 except that the continuous ~eb is sho~n in the process o~` being moved into contact with the engraved ro roll for applying the successive strips of adhe~ive;
Figure 3 is an ele~ational view of the apparatus taken along line

3-3 of Figure 2; and Figure 4 is a perspective view showing a portion of a continuous ~eb with the strips of adhesive applied thereon using the apparatus of Figures 1 -to 3.
Turning now to the drawings wherein like reference characters refer to like and corresponding parts throughout the several views, the present apparatus is generally shown in Figures 1 ~o 3 with the parts thereof not involving the invention being omitted for the sake of clarity. The apparatus includes an engraved roll 10 journalled for rotation about its axial shaft 11 between spaced sid0 plates 12 of the apparatus. A fountain or pan 13 is located beneath roll 10 and contains a quantity of a cold or hot melt ad-hesive 14. The adhesive is, of course, maintained at such a level as to insure that grooves 15 on the engraved roll are sufficiently filIed as the roll moves through the level of adhesive. A scraper or doctor blade 16 is operatively mounted within the pan or elsewhere on the apparatus for reg~a-ting the amount of adhesive on the engrc~ved roll.
An impression roll or cylinder 17 is journalled for rotation about its own axial shaft 18 also mounted between spaced side plates 12, and is ;
maintained slightly spaced from the engraved roll as shown clearly in Figures 1 to 3. Here, toothed wheels 19 and 21 are respectively mounted on ~ ;
shafts 11 and 18 in intermeshing engagement so that, upon rotation of shaft 11 through some suitable power source (not shown), such rotation will be -~
effectively transmitted to impression roll 17 for corresponding rotation thereofO

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The in~re~sion cylinder has a s~ooth per:ipheral sur~face of polished steel or the like, and serves to guide a continuous web 22 in the munner shown in the drawings between the impression cylinder and roll 10. In accordance with the invention, a conpressible blanket of rubber or similar material in the form of an elongated strip 23 is removably secured to the per.ipheral sur-f~ce of the inpression roll. This strip is provided with a rubberized adhesive backing or the like to permit it to be easily removed and relocated in some desired location on the impression roll peripheral surface.
In order to insure that a sufficient quantity of adhesiva is coated on the roll 10 so as to adequately fill grooves 15 thereof, ten to fifteen of ;~
such grooves per inch are provided on the perîpheral surface of roll 10 in some customary mannerO As se~n in Figure 3, the grooYe~ intersect at righ~
angles s~ às to form quadrangular cells with each cell having straight side walls (see Figures 1 and 2) and baing genarally perpendicular to the peripher-al surface of the engraved roll. The width of each cell is therefore constant between top and bottom thereof In operation, cells 15 are filled with adhesive 14 as roll 10 picks up a quantity of aahesive during its rotation in the direction of the arrows shown in Figure 1. Cylinder 17 is rotated in the direction of its arrow shown therein through the interengagement of gear wheels 19 and 21 Strip ~3 has a thickness slightly greater than the spacing between rolls 17 and 10 so that, as the strip is moved into this spacing between the rolls, it serves to move a portion of webb 22 toward roll 10 and into firm contact there- -with as shown in Figures 2 and 3. During such contact with the engraved roll, the web picks up a quantity of adhesive thereform corresponding precisely to the configuration and outer surface dimension of the strip. In the drawings, ~ !
the strip 23 is shown as elongated so as to cause a ~trip 24 of adhesive to be ~pplied succes~ively on to the web in the manner as shown in Figure

4 Of course~ more than one of such strips 23 may be provided and any Z6~ ~
n~mlber of configur~ltlons and sizes thereof is possible causing a correspond-ing configuration and si3e to be successively applied aLong the length of web 22 at various portions thereof. S:ince strip 23 is easily removable, it may be placed on roll 17 at any location depending on the intended location of strips 24 for the web.
From ttle foregoing, it can be seen that a simple yet highly 0ffec-tive apparatus for applying a pattern pasted strip of adhesive successively on to a continuous web has been devised with few moving parts yet being versatile enough so as to permit any number of successive strips of adhesive 10 in any mlmber of configurations and sizes to be applied along the length of ;~
the continuous web, depending on the size, configuration and number of strips 23 secured to the periphery of impression cylinder 17~ The strip or strlps ;~
23 simply move a portion of the web outwardly from the impression cylinder and into contact with the engraved roll to thereby apply a corresponding .
configuration and size of patterned adhesive successiveIy on to the continu-ous web. With the~wer grooves of ten to fifteen per inch, as compared to . .
much smaller cell sizes of 100 to 200 grooves per inch as heretofore provided, `~
and by providing the cell side walls as being substantially perpendicular to the peripheral surface of the engraved rol] as compared to tapered walls of other cells in this art, a more efficient and reliable adhesive applying apparatus is made possible. Also, both cold or hot melt adhesive may be applied successively to the continuous web with this apparatus. For hot melt adhesives, a heating rod 1S simply inserted in the engraved roll and a strip heater lS attached to pan 14. The speed of the present apparatus is capable of reaching 1000 ft. per minute for the web and is capable of handling liquid adhesives of most viscositiesl `

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. Apparatus for applying a strip of a patterned spread of adhesive transversely across a continuous web, comprising a rotatably mounted engraved roll, a pan mounted at one side of said roll and containing a quantity of adhesive for applying same to said roll, an impression cylinder about which the continuous web is guided between said cylinder and said roll, said cylinder being rotatably mounted and slightly spaced apart from the periphery of said roll, a compressible blanket strip removably secured to the peri-pheral surface of said cylinder and lying along the rotational axis thereof, said blanket strip having an outer surface dimension less than the surface dimension of said peripheral surface and having a thickness slightly greater than the spacing between said roll and said cylinder, whereby a corresponding size of adhesive strip is successively impressed upon the web as said blanket strips moves the web into contact with the adhesively wetted engraved roll upon rotation of said roll and said cylinder.

2. The apparatus according to claim 1 wherein inter-engaging gear means on said roll and said cylinder effects rotation of both at some desired speed.

3. The apparatus according to claim 1 wherein said periphery of said roll is engraved with 10 to 15 lines per inch defining quadrangular cells having straight sides perpendicular to said periphery.