Single facer for manufacturing single-faced corrugated board

Abstract

A single facer for manufacturing single-faced corrugated board having a first corrugating roll and a second corrugating roll meshing with the first corrugating roll to form a nip for receiving a sheet medium to corrugate the same, the second corrugating roll being provided with radial conduits extending toward its periphery through which suction is applied for attracting and holding the corrugated medium onto the peripheral surface thereof. The outer ends of the conduits terminate in the bottoms of axially spaced circumferential grooves formed around the periphery of the second corrugating roll. Finger-like plates engage within the circumferential grooves to seal at least some of the conduits disposed in the portion of the second corrugating roll which is not lapped by the corrugated medium. The apparatus further includes an applicator for applying adhesive to the peaks of the flutes of the corrugated medium and a pressure roll for pressing a sheet linerboard against the corrugated medium after the adhesive has been applied to bond the linerboard to the corrugated medium.

I claim: 
     
       1. A single facer for manufacturing single-faced corrugated board comprising: (a) a first corrugating roll;   (b) a hollow second corrugating roll meshing with said first corrugating roll to form a nip for receiving a sheet medium to corrugate the same;   (c) a source of suction connected to the hollow portion of the second corrugating roll to maintain pressure within the hollow portion below atmospheric pressure;   (d) plural axially spaced circumferential grooves disposed about the periphery of the second corrugating roll;   (e) plural suction conduits connecting the hollow portion of the second corrugating roll to at least some of the circumferential grooves, whereby suction attracts and holds the corrugated medium onto a portion of the peripheral surface of the second corrugating roll;   (f) sealing means having members engaging within the grooves to seal at least some of the conduits disposed in that portion of the second corrugating roll not lapped by the corrugated medium;   (g) means for applying adhesive to the peaks of the flutes of the corrugated medium; and   (h) a pressure roll for pressing a sheet linerboard against the corrugated medium after the adjesive has been applied, to bond the linerboard to the corrugated medium.   
     
     
       2. A single facer as claimed in claim 1, wherein said sealing means serves as guide to strip from the second corrugating roll the corrugated medium passing between the second corrugating roll and the pressure roll. 
     
     
       3. A single facer as claimed in claim 1, further including guide means having members engaging within axially spaced circumferential grooves disposed around the periphery of said second corrugating roll to strip from said second corrugating roll the corrugated medium passing between the second corrugating roll and the pressure roll. 
     
     
       4. A single facer as claimed in claim 3, wherein said members of the guide means are engaged within grooves that have said suction conduits. 
     
     
       5. A single facer as claimed in claim 1, wherein the second corrugating roll and the sealing means are movable together in the axial direction of the second corrugating roll. 
     
     
       6. A single facer as claimed in claim 3, wherein the second corrugating roll, the sealing means and the guide means are movable together in the axial direction of the second corrugating roll. 
     
     
       7. A single facer for manufacturing single-faced corrugated board comprising: (a) a first corrugating roll;   (b) a hollow second corrugating roll meshing with said first corrugating roll to form a nip for receiving a sheet medium to corrugate the same;   (c) a source of suction connected to the hollow portion of the second corrugating roll to maintain pressure within the hollow portion below atmospheric pressure;   (d) plural axially spaced circumferential grooves disposed about the periphery of the second corrugating roll;   (e) plural suction conduits connecting the hollow portion of the second corrugating roll to at least some of the circumferential grooves, whereby suction attracts and holds the corrugated medium onto a portion of the peripheral surface of the second corrugating roll;   (f) means for applying adhesive to the peaks of the flutes of the corrugated medium;   (g) a pressure roll for pressing a sheet linerboard against the corrugated medium after the adhesive has been applied, to bond the linerboard to the corrugated medium; and   (h) guide means having members engaging within axially spaced circumferential grooves disposed around the periphery of said second corrugating roll to strip from said second corrugating roll the corrugated medium passing between the second corrugating roll and the pressure roll.   
     
     
       8. A single facer as claimed in claim 7, wherein said members of the guide means are engaged within grooves that have said suction conduits. 
     
     
       9. A single facer as claimed in claim 8, wherein the second corrugating roll and the guide means are movable together in the axial direction of the second corrugating roll. 
     
     
       10. A single facer as claimed in claim 8, wherein said guide means members serve as sealing means to seal at least some of the suction conduits disposed in that portion of the second corrugating roll not lapped by the corrugated medium. 
     
     
       11. A single facer as claimed in claim 7, further including sealing means having members engaging within grooves that have said suction conduits to seal at least some of the conduits disposed in that portion of the second corrugating roll not lapped by the corrugated medium. 
     
     
       12. A single facer as claimed in claim 11, wherein the second corrugating roll, the guide means and the sealing means are movable together in the axial direction of the second corrugating roll. .Iadd. 13. A single facer for manufacturing single-faced corrugated board comprising: (a) a first fluted corrugating roll;   (b) a second fluted corrugating roll meshing with said first corrugating roll to form a nip for receiving a sheet medium to corrugate the same;   (c) plural axially spaced circumferential grooves disposed about the periphery of the second corrugating roll, said grooves each having a bottom located below the bottoms of the flutes on the second roll;   (d) plural suction conduits formed in the periphery of the second corrugating roll to provide a suction force for attracting and holding the corrugated sheet medium onto a portion of the peripheral surface of the second corrugating roll, each said suction conduit having an inner end and an outer end, said outer suction conduit ends terminating at the bottoms of the grooves whereby said outer ends are spaced from the corrugated medium on the second corrugating roll;   (e) a source of suction connected to the inner ends of the suction conduits;   (f) means for applying adhesive to the peaks of the flutes of the corrugated medium; and   (g) a pressure roll for pressing a sheet linerboard against the corrugated medium after the adhesive has been applied, to bond the linerboard to the   
     
     
        corrugated medium. .Iaddend..Iadd. 14.  A single facer as claimed in claim 13, wherein (a) the second corrugating roll is provided with at least one hollow portion communicating with the inner ends of a plurality of suction conduits and   (b) conduit means connects the hollow portion to the source of suction to maintain pressure within the hollow portion below atmospheric pressure. .Iaddend. .Iadd. 15. A single facer as claimed in claim 13, wherein   (a) the suction conduits are arranged radially relative to the second corrugating roll and   (b) a plurality of said radial suction conduits are spaced circumferentially along the bottom of each groove of a plurality of the axially spaced circumferential grooves to provide an arcuate gap in each of said grooves between the outer ends of the radially extending suction conduits and the corrugated medium on the second corrugating roll, whereby the suction force emanating from the suction conduits is distributed uniformly over a wide area of the corrugated sheet to hold the corrugated sheet tightly onto the periphery of the second corrugating roll. .Iaddend. .Iadd. 16. A single spacer as claimed in claim 13, further including in each of the grooves an arcuate gap between the outer ends of the suction conduits located at the bottom of the groove and the corrugated medium on the second corrugating roll, whereby the suction conduits remain free of contact with the corrugated medium during operation of the single facer. .Iaddend..Iadd. 17. A single facer as claimed in claim 13, further including means having members engaging within axially spaced circumferential grooves disposed around the periphery of the second corrugating roll to strip the corrugated medium from said roll. .Iaddend..Iadd. 18. A single facer as claimed in claim 13, further including sealing means having members engaging within said grooves to seal at least some of the suction conduits disposed in the portion of the second corrugating roll not lapped by the corrugated medium. .Iaddend..Iadd. 19. A single facer as claimed in claim 18, wherein said sealing means serves as guide means to strip from the second corrugating roll the corrugated medium passing between the second corrugating roll and the pressure roll. .Iaddend..Iadd. 20. A single facer as claimed in claim 13, further including guide means having members engaging within axially spaced circumferential grooves disposed about the periphery of said second conrrugating roll to strip from said second roll the corrugated medium passing between said second corrugating roll and the pressure roll. .Iaddend. .Iadd. 21. A single facer as claimed in claim 20, wherein said guide means members serve as sealing means to seal at least some of the suction conduits disposed in that portion of the second corrugating roll not lapped by the corrugating medium. .Iaddend. .Iadd. 22. A fingerless single facer for manufacturing single-faced corrugated board comprising:   (a) a first fluted corrugating roll;   (b) a second fluted corrugating roll meshing with said first corrugating roll to form a nip for receiving a sheet medium to corrugate the same;   (c) plural axially spaced circumferential grooves disposed about the periphery of the second corrugating roll, said grooves each having a bottom located below the bottoms of the flutes on the second roll;   (d) plural suction conduits formed in the periphery of the second corrugating roll to provide a suction force for attracting and holding the corrugated sheet medium onto a portion of the peripheral surface of the second corrugating roll, each said suction conduit having an inner end and an outer end;   (e) said outer suction conduit ends terminating at the bottoms of at least some of the grooves whereby said outer ends are spaced from the corrugated medium on the second corrugating roll to provide an arcuate gap in each of said grooves between the outer ends of the suction conduits and the corrugated medium on the second corrugating roll, whereby a suction force emanating from the suction conduits is distributed uniformly over a wide area of the corrugated sheet to hold the corrugated sheet tightly onto the periphery of the second corrugating roll;   (f) a source of suction connected to the inner ends of the suction conduits;   (g) means for applying adhesive to the peaks of the flutes of the corrugated medium;   (h) a pressure roll for pressing a sheet linerboard against the corrugated medium after the adhesive has been applied, to bond the linerboard to the corrugated medium; and   (i) dual means comprising both sealing means and guide means, said dual means having members engaging within grooves that contain suction conduits to seal suction conduits in the portion of said second corrugating roll not lapped by the corrugated medium and having members to strip from the second corrugating roll the corrugated medium passing between the second   
     
     
        corrugating roll and the pressure roll. .Iaddend..Iadd. 23.  A fingerless single facer as claimed in claim 22, wherein (a) the dual means is provided with sealing members to seal suction conduits and   (b) said sealing members also constitute stripping means for stripping the laminated corrugated medium and linerboard from the second corrugating roll. .Iaddend..Iadd. 24. A fingerless single facer as claimed in claim 22, wherein   (a) the dual means is provided with stripping members for stripping the laminated corrugated medium and linerboard from the second corrugating roll and   (b) said stripping members also constitute sealing means for sealing suction conduits. .Iaddend.