| 摘要 |
A method and apparatus for continuously forming a multi-ply corrugated container board from freshly laid web plies by simultaneously forming the separate plies from aqueous slurries of fibers on corresponding foraminous fabrics, and dewatering each of them sufficiently to form a web ply capable of being handled in a papermaking machine as an integral web. All of the webs are formed on a single papermaking machine, but separately. The first web ply is laid on a traveling forming wire, such as a fourdrinier wire, and each subsequent web ply is formed in close proximity to the traveling forming wire and brought into bonding engagement seriatim with the top surface of the previously formed web ply carried on the traveling forming wire. A typical corrugated box board has three plies with the inner ply being corrugated. In this invention, the intermediate web ply is doctored off either its forming roll or a pick-off roll and is allowed to contact the preceding layer in its characteristic fluted or corrugated configuration. A spray of adhesive material is introduced onto the first ply before the corrugated ply is brought into contact and another adhesive spray is introduced onto the top surface of the corrugating medium to bond it to the top ply. Each layer of the multi-ply corrugated board is thus formed and built into the composite product in the forming section of a single papermaking machine. The completely formed corrugated combined board is then introduced into a suitable drying environment to finish the product. |
