Apparatus for impregnating corrugated cardboard

{
  "publication_number": "US3669064A",
  "country": "US",
  "kind": "A",
  "title": "Apparatus for impregnating corrugated cardboard",
  "abstract": "Apparatus for impregnating longitudinally travelling corrugated board having transversely extending flutes, including suction means arranged adjacent one longitudinal edge of the board for establishing a vacuum in the flutes to draw a material, such as an impregnant, therethrough. The invention is characterized by the provision of retaining means for preventing undesirable lateral displacement of the board in the direction of the suction means. In the preferred embodiment, the retaining means comprise longitudinally extending endless belt means responsive to the vacuum established in the flutes for clamping the moving board against lateral displacement without crushing the flutes or causing damage to the board. Preferably the endless belt means are provided with longitudinal ribs that extend within corresponding grooves in the rollers upon which the belts are mounted, thereby preventing lateral movement of the belt meansand the board-relative to the rollers. In accordance with an important feature of the invention, flow control means are provided for accurately controlling the speed and/or extent of longitudinal penetration of the material through the flutes.",
  "claims": [
    "1. Apparatus for impregnating horizontally arranged corrugated board continuously supplied by corrugator apparatus at a uniform initial linear velocity, said board including a serpentine fibrous intermediate layer cooperating with at least one fibrous outer layer to define a succession of transversely extending flutes, comprising a. stationary impregnant supply means for supplying fluid impregnating material adjacent one longitudinal edge of said board; b. stationary suction means arranged adjacent the other longitudinal edge of said board for establishing a vacuum in said flutes to draw the impregnating material therethrough; and c. retaining means for preventing lateral displacement of said board in the direction of said suction means during passage of said board between said supply means and said suction means, said retaining means including 1. a stationary frame extending transversely of the board between said impregnant supply means and said suction means; and 2. clamping means connected with said frame and operable in response to the vacuum established in the flutes for clamping said board against lateral movement relative to said frame, said clamping means including a. longitudinally extending endless belt means adjacent at least one of the upper and lower surfaces of the board, said endless belt means having such a width relative to the width of the board that the belt is sucked by the vacuum in the flutes into clamping engagement with the board; and b. drive means for driving the endless belt means at a velocity at least as great as said initial linear velocity.",
    "2. clamping means connected with said frame and operable in response to the vacuum established in the flutes for clamping said board against lateral movement relative to said frame, said clamping means including a. longitudinally extending endless belt means adjacent at least one of the upper and lower surfaces of the board, said endless belt means having such a width relative to the width of the board that the belt is sucked by the vacuum in the flutes into clamping engagement with the board; and b. drive means for driving the endless belt means at a velocity at least as great as said initial linear velocity. clamping means connected with said frame and operable in response to the vacuum established in the flutes for clamping said board against lateral movement relative to said frame; and d. means for adjusting each of said impregnant supply means and said suction means laterally of said corrugated board to accommodate different widths of corrugated board stock. a channel member extending longitudinally adjacent said one board edge, said channel member including a first series of longitudinally spaced first outlets arranged for communication with one end of the board flutes; and clamping means connected with said frame and operable in response to the vacuum established in the flutes for clamping said board against lateral movement relative to said frame. Apparatus for impregnating longitudinally traveling corrugated board having a serpentine fibrous intermediate layer defining with at least one outer layer a succession of transversely extending flutes, comprising a. corrugator apparatus for forming roll paper into corrugated board and for conveying the board at a uniform initial linear velocity; b. stationary impregnant supply means for supplying impregnating material adjacent one longitudinal edge of said board; c. stationary suction means arranged adjacent the other longitudinal edge of said board for establishing a vacuum in said flutes to draw the impregnating material therethrough; d. retaining means for preventing lateral displacement of said board in the direction of said suction means during passage of said board between said supply means and said suction means, said retaining means including clamping means connected with said frame and operable in response to the vacuum established in the flutes for clamping said board against lateral movement relative to said frame, said clamping means including longitudinally extending endless belt means adjacent at least one of the upper and lower surfaces of the board, said endless belt means having such a width relative to the width of the board that the belt is sucked by the vacuum in the flutes into clamping engagement with the board; e. stationary means for longitudinally scoring and slitting the impregnated board into sections; f. rotary cut-off means for severing the sections into given lengths; g. and means for driving said endless belt means and said rotary cut-off means in synchronism with said board conveying means.",
    "3. Apparatus as defined in claim 2, and further including support means for alternately supporting said frame at operative and inoperative positions, respectively, relative to said corrugator conveying means and said scoring and slitting means. a plurality of conduit means each containing adjustable flow regulating means for connecting said first outlets with said source, respectively; b. stationary suction means arranged adjacent the other longitudinal edge of said board for establishing a vacuum in said flutes to draw the impregnating material therethrough; and c. retaining means for preventing lateral displacement of said board in the direction of said suction means during passage of said board between said supply means and said suction means, said retaining means including",
    "4. Apparatus for impregnating continuously traveling horizontally arranged corrugated board including a serpentine fibrous intermediate layer cooperating with at least one fibrous outer layer to define a succession of transversely extending flutes, comprising a. stationary impregnant supply means for supplying fluid impregnating material adjacent one longitudinal edge of said board; b. stationary suction means arranged adjacent the other longitudinal edge of said board for establishing a vacuum in said flutes to draw the impregnating material therethrough; and c. retaining means for preventing lateral displacement of said board in the direction of said suction means during passage of said board between said supply means and said suction means, said retaining means including",
    "5. Apparatus for impregnating continuously traveling horizontally arranged corrugated board including a serpentine fibrous intermediate layer cooperating with at least one fibrous outer layer to define a succession of transversely extending flutes, comprising a. staTionary impregnant supply means for supplying fluid impregnating material adjacent one longitudinal edge of said board, said impregnant supply means including",
    "6. Apparatus for impregnating longitudinally traveling horizontally arranged corrugated board having a serpentine fibrous intermediate layer defining with at least one planar fibrous outer layer a succession of transversely extending flutes, comprising a. a frame; b. stationary suction means connected with said frame for defining a suction chamber having a rear wall portion adjacent and spaced from one longitudinal edge of said board to establish a vacuum in said flutes; c. stationary impregnant supply means connected with said frame directly opposite said suction means for supplying fluid impregnating material adjacent the other longitudinal edge of said board, whereby said fluid impregnating material is drawn by suction through the flutes to impregnate at least the internal portion of the board; and d. retaining means for preventing lateral displacement of said board in the direction of said suction means during passage of said board between said supply means and said suction means, said retaining means comprising longitudinally extending horizontal endless belt means adjacent at least one of the upper and lower surfaces of the board, said endless belt means having such a width relative to the width of the board that the belt is sucked by the vacuum in the flutes into clamping engagement with the board.",
    "7. Apparatus as defined in claim 6, wherein the width of said endless belt means is less than the width of the board.",
    "8. Apparatus as defined in claim 6, wherein said endless belt means comprises upper and lower endless belts having longitudinal runs adjacent the upper and lower surfaces of said board, respectively.",
    "9. Apparatus as defined in claim 8, wherein at least one of said belts is impervious.",
    "10. Apparatus as defined in claim 4, wherein each of said lateral adjustment means includes guide means slidably connected for lateral movement relative to said frame, and hydraulic piston-cylinder means for laterally displacing said guide means relative to said frame.",
    "11. Apparatus as defined in claim 10, wherein each of said impregnating supply means and said suction means includes a channel member extending longitudinally adjacent opposite edges of the corrugated board, respectively; and further including pivot means connecting each of said channel members with the corresponding guide member, respectively, for pivotal movement about an axis normal to the plane of the corrugated board.",
    "12. Apparatus as defined in claim 5, wherein said impregnant supply channel member includes subsequent to said first series of outlets a second series of longitudinally spaced second outlets, and further including a plUrality of conduit means each containing adjustable flow regulating means for supplying hot air to said second outlets, respectively.",
    "13. Apparatus as defined in claim 12, wherein said suction means includes a channel member extending longitudinally adjacent the opposite edge of the cardboard, said suction channel member including a series of longitudinally spaced inlets arranged for communication with the other end of the board flutes; said suction means including also a vacuum source, and a plurality of conduits each containing adjustable flow regulating means for connecting said channel inlets with said vacuum source.",
    "14. Apparatus as defined in claim 13, wherein at least one of said channel members comprises a longitudinal series of sections, and means connecting said sections to form a rigid assembly.",
    "15. Apparatus as defined in claim 14, wherein said channel section connecting means includes pin means extending longitudinally from one end of one section, the adjacent end of the next section containing corresponding recess means for receiving said pin means.",
    "16. Apparatus as defined in claim 13, and further wherein each of said channel members includes seal means for sealing the ends of the flutes from the ambient atmosphere during passage of said flutes through the impregnation station.",
    "17. Apparatus as defined in claim 13, and further including means for heating at least one of said channel members.",
    "18. Apparatus as defined in claim 6, wherein said impregnant supply means includes means for mixing together controlled quantities of an impregnant and a transporting gaseous fluid.",
    "19. Apparatus as defined in claim 18, wherein said impregnant supply means includes means defining a turbulence mixing chamber, spray nozzle means for introducing the impregnant into said chamber, and means for introducing hot air into said chamber, said chamber having an outlet adjacent one longitudinal edge of the board for supplying the impregnant/air mixture to the flutes.",
    "20. Apparatus as defined in claim 19, wherein said spray nozzle means is axially adjustable relative to said chamber outlet.",
    "21. Apparatus for impregnating longitudinally travelling horizontally arranged corrugated board having a serpentine fibrous intermediate layer cooperating with at least one planar fibrous outer layer to define a succession of transversely extending flutes, comprising a. a frame; b. stationary suction means connected with said frame adjacent one longitudinal edge of said board to establish a vacuum in the flutes opposite thereto, said suction means including a suction channel member defining a longitudinally extending suction chamber partially receiving the adjacent edge portion of said board, said suction chamber having a rear wall portion adjacent and spaced from the adjacent edge extremity of said board; c. stationary impregnant supply means connected with said frame directly opposite said suction means for supplying fluid impregnating material adjacent the other longitudinal edge of said board, whereby said fluid impregnating material is drawn by suction through the flutes to impregnate at least the internal portion of the board; and d. retaining means for preventing lateral displacement of said board in the direction of said suction means during passage of said board between said supply means and said suction means."
  ],
  "cpc": [
    "D21H 23/50",
    "B31C 11/00",
    "D21H 17/33",
    "D21H 17/60",
    "D21H 17/61",
    "D21H 17/66",
    "D21H 17/71",
    "D21H 23/30",
    "Y10T 156/1025"
  ],
  "assignees": [
    "BOISE CASCADE CORP"
  ],
  "filing_date": "1970-02-09",
  "publication_date": "1972-06-13",
  "grant_date": "1972-06-13",
  "priority_date": "1970-02-09",
  "application_number": "US-3669064D-A",
  "family_id": "21738538"
}