Manufacturing container or tube from paper; or other manufacturi – Assembling or disassembling of distinct members – Comprising bringing two members together
Patent
1998-09-11
2000-08-01
Johnson, Brian L.
Manufacturing container or tube from paper; or other manufacturi
Assembling or disassembling of distinct members
Comprising bringing two members together
493475, 493478, 156470, 156472, B31B 4900, B31F 100
Patent
active
060959630
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to improvements in machinery for manufacturing corrugated paperboard of the type in which two corrugated mediums are joined at their flute tips without an intermediate flat sheet.
BACKGROUND OF THE INVENTION
Australian patents 609089 and 655076, which correspond to U.S. Pat. Nos. 4,886,563 and 5,674,349 respectively, disclose machinery for forming a corrugated paperboard structure having flute tip to flute tip bonding in which two sets of corrugating rolls are aligned so that two corrugated mediums are brought into tip to tip registration in the gap between the central two rolls and the combined mediums are then conveyed by an adjacent carrier roll to further downstream processing.
Patent 655076 identified that lack of rigidity in the support frame and in the corrugating rolls can lead to relative movement between the corrugating rolls and consequently to misalignment of the flute tips along the length of a roll, that is transversely of the paperboard. It attempted to alleviate the problem using end gears to control the relative position of the flute tips along the length of the two rolls. Misalignment of the flute tips in the finished board has a deleterious effect on the strength properties of the board.
BRIEF DESCRIPTION OF THE INVENTION
It is an object of this invention to provide an apparatus which reduces the likelihood of misalignment occurring.
To this end the present invention provides apparatus for making corrugated paperboard in which two fluted mediums are joined at the flute tips without an intermediate liner in which two pairs of corrugating rolls are arranged so that the fluted mediums are brought together at their flute tips between the inner rolls of each pair the improvement comprising the provision of one frame for all four rolls, with the second pair being on a second frame mounted on said one frame so that the second frame is moveable toward the inner roll of the first pair of corrugating rolls.
In more detail the invention provides apparatus for making corrugated paperboard in which two corrugated mediums are bonded together at their flute tips without any intermediate liner which apparatus includes pressed toward said first corrugating roll corrugating roll remote from said second corrugating roll, said second frame being capable of being moved toward and away from said first corrugating roll said third roll remote from said first roll, said fourth roll being capable of being moved toward and away from said third roll first frame so that a fixed gap is created between the first and third corrugating rolls.
This frame arrangement contrasts with the frame used in the machine described in patents 609089 and 655076. In those patents the frame was in two parts with the first and second rolls and the carrier roll on one frame, the third and fourth rolls on the second frame and the two frames being brought together to align the corrugations of the first and third rolls. This arrangement lacked rigidity particularly along the length of the aligned corrugations between the first and third rolls. The fact that the carrier roll was part of one frame made it cumbersome to move.
By having one frame for mounting all four corrugating rolls and mounting the second pair of rolls on a second frame to form a cassette that is mountable on the first frame, movement and twisting of the first and third corrugated rolls relative to each other is reduced.
It is preferred that the main frame be thicker than for conventional corrugating machines and a thickness of at least 200 mm is preferred.
BRIEF DESCRIPTION OF THE DRAWING
The drawing is a schematic representation of the invention showing the main rolls in their open or non operational positions.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The method and general form of the corrugating machine is similar to that described in Australian patents 609089 and 655076.
The core of the apparatus is the arrangement of the two pairs of corrugating rolls. These are mounted on the main frame 11 shown in do
REFERENCES:
patent: 1184748 (1916-05-01), Hicks
patent: 1796541 (1931-03-01), Schoo
patent: 3541829 (1970-11-01), Engleman
patent: 4818330 (1989-04-01), Mosburger
patent: 5116448 (1992-05-01), Murayama et al.
patent: 5306384 (1994-04-01), Stutt
patent: 5674349 (1997-10-01), McKinlay et al.
Amcor Limited
Johnson Brian L.
Luby Matthew
LandOfFree
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