US1981338A - Machine for making corrugated paper board - Google Patents

Description

Nov. 20, 1934. 7 G, w IFT, JR 1,981,338

HINE FOR MAKING I RRUGATED PAPER BOARD Filed Jan. 10, 1934 2 Sheets-Sheet 1 Nov. 20, 1934.

G. W. SWIFT, JR

MACHINE FOR MAKING CORRUGATED PAPER BOARD 2 Sheets-Sheet 2 Filed Jan, 10, 1934 Patented Nov. 20, 1934 UNITED STATES MAGHINE FOR MAKING CORRUGATED PAPER BOARD George W. Swift, Jr., Bordentown, N. 1., asaignor to George W. Swift, Jr., Inc., Bordentown, N. 3., a corporation of New Jersey Application January 10, 1934, Serial No. 706,004

11 Claims. (01.154-31) The present invention relates to corrugated paper board machines and more especially to that type of corrugated paper board machines in which a paper web which is corrugated as 6 it passes between two corrugated rolls is maintained in mesh with one of said corrugated rolls for moving the corrugated web past a roll which applies silicate or other adhesive to the crowns or tips of the corrugations in preparation for 10 the application of a liner web thereto. Heretofore, in machines of this character, it has been customary to employ curved strippers and guide fingers extending through peripheral grooves in the silicate roll and around the periphery of one of the corrugated rolls for stripping the corrugated web from the other corrugated roll and maintaining it in mesh with the former. With a view to overcoming certain inherent drawbacks in machines of this character, my present invention contemplates an improved construction which obviates the necessity for guides or fingers for retaining the corrugated web in closely fitting relation to the corrugated roll during that portion of its path of movement which extends between the adhesive applying roll and the liner applying roll.

The primary purpose of my invention is twofold, namely, on the one hand, to prevent the accumulation of adhesive on the paper guides extending downwardly around the corrugated roll from the adhesive applying rollwhich results in gumming up the guide fingers and messing up the paper and, on the other hand, to prevent the occurrence of ba'ld streaks extending '35 across the tips or crowns of the corrugations due to the provision of peripheral slots in the silicate roll for accommodating the paper guides and to the pressure of said guides against the corrugated web. Inasmuch as these paper guid- 40 ing fingers may be, for example, of an inch in thickness and arranged at spaced intervals three or four inches apart, the result has been heretofore to produce corrugated board in which the bond between the corrugated and liner webs was absent in streaks, say, inch wide and three to four inches apart across the entire width of the corrugated paper board. As an 11- lustration of the serious efiects that may result from these unbonded areas, the manufacture of boxes from blanks cut from corrugated board may be cited. Thus, in the making of boxes, the blanks are provided with slots and creases arranged in predetermined order in respect to the size and'shape of the cut blank, but irrespective of the unbonded streaks between the webs. As

a result, it commonly happens that the creases and slots formed in box blanks become associated with the unbonded areas between the attached webs in such a way as to produce boxes of inferior quality.

For the purpose of overcoming these drawbacks in the operation of the machine and defects in the product manufactured thereby, my invention contemplates the use of adhesive applying rolls having unbroken peripheral surfaces for applying the adhesive without bald spots to each successive corrugation and together therewith a device operating by suction upon the corrugated web during its travel downwardly around the corrugated roll from the adhesive 79 applying roll and thus eliminating the axially spaced paper guiding lingers in slidable contact with the corrugations in the paper web. My invention further contemplates means of improved construction for applying suction to a corru- 7 gated web as it moves around one of the webcorrugating rolls which impresses the corrugations therein and an improved arrangement of said suction-applying means with respect to said web-corrugating roll whereby the desired eiTects 80 may be obtained without unduly cooling ed the web-corrugating rolls to a temperature at which they do not function withmaximum efficiency.

Further objects of my invention will appear in the specification in connection with the cons'truction and arrangement of certain parts as recited in the claims, reference being had to the accompanying drawings which show an adaptation of my invention to a corrugated paper board machine of a well-known type. 9

In the drawings,

Figure 1 is a fragmentary top plan view of the vertically superposed corrugating rolls of a machine for making corrugated paper board to which my invention has been adapted, portions 9 of the upper corrugating roll being broken away to afford a clearer view of the construction and arrangement of parts related to the lower corrugating roll.

Figure 2 is an enlarged vertical section of the 10 machine corresponding to the line 2-2 of Figure 1, parts being shown in elevation.

Figure 3 is a fragmentary radial section on the line 3-3 of Figure 2.

Figure 4 is a vertical section similar to Figure 2 showing a modified form of the suction fingers.

Referring more particularly to the drawings, the type of corrugated paper board machine shown therein includes an upper corrugating roll 1, a lower corrugating roll 2 intermeshing therewith for corrugating a continuously'supplied web 3, and a pressure roll 4 which rotates about an axis parallel to the rotary axes of the upper and lower corrugating rolls and arranged in a. common plane therewith. The pressure roll 4 is suitably spaced from the lower corrugating roll 2 to receive a liner web '5 between it and the crowns or tips of the corrugated-web 3, to which an adhesive (silicate) has been previously applied by a silicate roll 6 which operates as a fountain roll in an adhesive-containing trough 7, an excess supply of adhesive or silicate being prevented by a squeegee r0118. The upper corrugating roll 1 is usually provided with a plurality of axially spaced peripheral grooves 1 to accommodate the-\rearwardly presented stripper plates or fingers 9 which project into the peripheral grooves 1' for the purpose of stripping the corrugated web from the upper corrugating roll 1. The stripper fingers 9 are provided with arcuate edges 9'- which are suitably spaced from the corrugated periphery of the lower corrugating roll 2 to maintain the corrugated web in close mesh with said corruapproaches the common axial plane of the corrugating roll 2 and pressure roll 4. For the purpose of overcoming the drawbacks of this construction as explained above, my present invention contemplates means of improved construction for maintaining the corrugated web in mesh with the lower corrugating roll below the common axial plane of said r'olls without the use of axially spaced guides which usually become messed up with adhesive and convey the adhesive to the paper below. In the embodiment of my invention shown in Figures 1 to 3 inclusive of the drawings, this improved construction contemplates a plurality of axially spaced peripheral grooves 2 formed in the lower corrugating roll 2, said grooves being of suflicient depth to accommodate a series of axially spaced suction fingers 10 which are presented forwardly and downwardly for about 180 around the rotary axis of the lower corrugating roll, said suction fingers being carried by rearwardly presented horizontal portions 10 which are connected to a suction manifold 11 through suitable control valves 12. As shown in Figure 2 of the drawings, each of the suction fingers 10 is provided with peripherally spaced series of air ports 10 and 10 which open radially outward from slightly within the root circle of the corrugations in the lower corrugating roll 2. The peripherally spaced groups of suction ports 10 and 10 are arranged on opposite sides of the common axial plane of the lower corrugating roll 2 and silicate roll 6 for permitting the corrugated web to bulge outwardly as the tips or crowns of thesilicate roll 6.

menace vention shown in Figure 4 of the drawings, there is shown an arrangement of upper and lower corrugating rolls 1 and2, pressure roll 4 and adhesive roll 6 substantially similar to that shown 'in Figure 2. Overhanging from a suction manifold 13 and connected thereto through valves 14 area plurality of axially spaced suc-' tion fingers 15 which are arranged the peripheral grooves 2 of the lower corrugating roll and preferably extend for about 180 around the rotary axis of the lower corrugating roll, and, as shown in Figure 4 of the drawings, each of said suction fingers is provided with an uninterrupted series of air ports 16 opening radially outward from within the suction finger. According to this embodiment of my invention, however, for the purpose of imparting a radial outward displacement to the corrugated web to improve the contact of the tips of the corrugations on the silicate roll, the outer peripheral wall of each of the suction fingers 15 is radially thickened at 15 to form a protuberance which is intersected by the common plane of the rotary axes of the lower corrugating roll 2 and adhesive roll 6.

I claimz- 1. In ,a corrugated paper board machine, a corrugated roll rotatable about an axis and provided with axially spaced peripheral slots, stationary curved suction fingers inserted in said slots and provided with air exhausting channels and radial ports opening therefrom into the intercorrugation spaces of said corrugated roll, an adhesive roll cooperating with said corrugated roll in respect to a corrugated web enmeshed with said corrugated roll, and means spaced from said adhesive roll around the periphery of and cooperating with said corrugated roll in respect to said corrugated web for applying a continuous liner web to said corrugated web.

2. In a corrugated paper board machine, upper and lower web-corrugating rolls rotatable about parallel axes, the lower web-corrugating roll being provided with peripheral slots, curved suction fingers arranged in said slots and fixedly supported from without, said suction fingers being provided with air exhausting channels and with outwardly opening radial ports, an adhesive roll cooperatively arranged with respect to said lower web-corrugating roll for applying adhesive to a corrugated web enmeshed in and conveyed by said lower corrugating roll, a pressure roll cooperatively arranged with respect to and spaced around the periphery of said lower corrugating roll from said adhesive roll for applying a liner web to said corrugated web, said suction fingers being terminated adjacent to said pressure roll, and means for supplying a continuous liner web to said corrugated web as the latter passes between said pressure roll and the lower web-corrugating roll.

3. In a corrugated paper board machine, the

combination with a paper corrugating roll, of a second paper corrugating roll cooperating therewith, said second paper corrugating roll being provided with axially spaced peripheral grooves, an adhesive roll operating on the second-mentinned corrugating roll, and curved suction fing'ers arranged in the peripheral slots of the second-mentioned corrugating roll and provided with; peripherally spaced series of outwardly opening radial ports on opposite sides of the common axial plane of the secondvmentioned corrugating roll and said adhesive'roll.

4. In a corrugated paper board machine, the

combination with a paper corrugating roll provided with axially spaced peripheral grooves, of curved suction fingers arranged in said axially spaced peripheral grooves, and an adhesive roll operating in opposition to the periphery of said corrugating roll for applying adhesive to the tips of a corrugated web conveyed by and passing around said corrugating roll, said suction fingers being provided with air exhausting channels and outwardly opening suction ports for holding the corrugated web in mesh with said corrugating roll, the peripheral outer walls of said suction fingers being provided with protuberances extending on opposite sides of the common axial plane of said rolls for displacing the tips of said corrugated web outwardly toward the adhesive roll.

5. In a corrugated paper board machine, the combination with a corrugated roll, of means for applying adhesive to the tips of a corrugated web in mesh with said corrugated roll, and means spaced from said adhesive-applying means around the periphery of said corrugated roll for applying a liner web to the adhesivebearing tips of said corrugated web, said corrugated roll being provided with a suction pipe extending part-way around the axis within the root-circle of the corrugations in said corrugated roll for applying suction to the corrugated web during its travel on said corrugated roll past said adhesive-applying means.

6. In a machine of the character described, the combination with a rotary corrugated roll, said corrugated roll being provided with a peripheral groove, of means for applying adhesive to the tips of said corrugated web in mesh with and moved by said corrugated roll, means spaced from said adhesive-applying means around the periphery of said corrugated roll for applying a liner web to the adhesive-bearing tips of said corrugated web, and a suction pipe located within said peripheral groove and extending partway around the axis of said corrugated roll for applying suction to the corrugated web during its travel with said corrugated roll past said adhesive-applying means.

7. In a corrugated paper board machine, the combination with a rotary corrugated roll constructed and arranged to mesh with a corrugated web delivered thereto, an adhesive-applying roll operating on the tips of said corrugated web while in mesh with said corrugated roll, said corrugated roll being provided with a peripheral groove, and a suction pipe extending past said adhesive-applying roll and part-way around the axis of said corrugated roll, said suction pipe being arranged within said peripheral groove for applying suction to the corrugated web during its movement towards and away from said adhesive-applying roll.

8. In a corrugated paper board machine, the combination with a rotary corrugated roll constructed to convey a corrugated web part-way around its axis of rotation, of a pressure roll constructed and arranged to apply a liner web to said corrugated web as it leaves said corrugated roll, an adhesive-applying roll operating on the tips of said corrugated web while in mesh with said corrugated roll, said corrugated roll being provided with a peripheral groove, and a curved suction pipe conformed to and disposed in said peripheral groove, said curved suction pipe extending part-way around the axis of said corrugated roll past said adhesive-applying roll and having its outwardly presented peripheral wall provided with air inlet ports for applying suction to the corrugated web during its travel with said corrugated roll past said adhesiveapplying roll.

9. A corrugated paper board machine of the character claimed in claim 8, in which the outer peripheral wall of said curved suction pipe is provided with a protuberant portion at the common axial plane of'said corrugated and adhesive-applying rolls for imparting an outward radial displacement of said corrugated web from the former roll as said web passes the latter roll.

10. In a corrugated paper board machine, the combination with a paper-corrugating roll, of a second paper-corrugating roll cooperating therewith, a pressure roll cooperating with said second corrugating roll in substantially the common axial plane of said corrugating rolls for applying a liner web to a corrugated web as it passes said common axial plane in mesh with said second corrugating roll, said second corrugating roll being provided with axially spaced grooves open outwardly through the corrugations therein, an adhesive roll cooperatively arranged with respect to said second corrugating roll intermediately with respect to the firstmentioned corrugating roll and said pressure roll for applying adhesive to the tips of said corrugated web, a suction main extending axially of said second corrugating roll, and a plurality of axially spaced suction tubes provided with suction ports in their outer peripheral walls and respectively disposed in and conforming to the peripheral grooves in said second corrugating roll for retaining the corrugated web in mesh with said second corrugating roll, said suction tubes being provided with tangential extensions presented away from said common axial plane adjacent to the first-mentioned corrugating roll 125 and with closed ends adjacent to said pressure roll.

11. In a corrugated paper board machine, the combination with cooperating web-corrugating rolls, one of said web-corrugating rolls being 130 constructed and arranged to convey a corrugated web in mesh therewith away from the other web-corrugating roll and having a plurality of axially-spaced peripheral grooves which open outwardly through the corrugations 35 therein, and means operating by suction within and through said axially-spaced peripheral grooves upon said corrugated web for holding it in mesh with the corrugations in said roll.

GEORGE W. SWIFT, JR.

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