Abstract: An apparatus and method for forming a fold construction in a triple wall corrugated paper board comprises a pair of spaced apart main frame plates having four support plates connected therebetween in a direction which is transverse to a feed direction for the paper board. A pair of shaft carrier plates which have linear bearings thereon, are mounted for sliding movement to the support shafts between the frame plates. Spreader tubes are engaged around the support shafts for maintaining a selected and accurate distance between the carrier plates. Upper and lower shafts are rotatably mounted between the carrier plates and carry knives, scoring members or other fold forming elements for scoring or cutting the paper board to form segments of the fold construction. A table is fixed between the carrier plates that cooperates with a hold down roller which is rotatably mounted between the plates, to hold the paper board down and prevent curling or warping as the fold construction is formed.

Abstract: An improved triple wall corrugated paper board fold construction is formed by joining a single face web with a nonadhered band of the medium to a contiguous liner of another one of the single face webs, slitting and removing a portion of the nonadhered band along a narrow bending area, and removing the slit strip to leave a bending groove formed with one or more score lines in the material underlying the groove, as the board continuously moves along a path of travel.

Abstract: An apparatus and method for forming a fold construction in a triple wall corrugated paper board comprises a pair of spaced a part main frame plates having four support plates connected therebetween in a direction which is transverse to a feed direction for the paper board. A pair of shaft carrier plates which have linear bearings thereon, are mounted for sliding movement to the support shafts between the frame plates. Spreader tubes are engaged around the support shafts for maintaining a selected and accurate distance between the carrier plates. Upper and lower shafts are rotatably mounted between the carrier plates and carry knives, scoring members or other fold forming elements for scoring or cutting the paper board to form segments of the fold construction. A table is fixed between the carrier plates that cooperates with a hold down roller which is rotatably mounted between the plates, to hold the paper board down and prevent curling or warping as the fold construction is formed.