Corrugated Cardboard Manufacturing Machine and Process with Pre-printed Liner
Common manufacturing processes of the preprinted paper corrugated board is shown in fig. 1: In the single face corrugated machine, rolled paper 1-2 after being preheated is pressed into corrugated shape by corrugation rolls, and then bonded with the rolled paper 1-2 via gluing by a gluing device 1-9 to form a single face corrugated board which is accumulated on transportion paper wheels 1-3 in a wavelike form and meanwhile slowly conveyed forward. The single face corrugated board 1-6 output by the transportion paper wheels 1-3 passes through a preset device 1-10 and then is glued by a gluing device 1-11 and converged with a face paper 2-1 to form a double face corrugated board which will enter into a drying device 3. The double face corrugated board drove by a conveyor transports forward, of which the face paper is in direct contact with the heating plates 3-1. One object of heating and drying is to enable the glue in the corrugated board to be cured and glued, in particularly to evaporate the water in the glue, thus forming a smooth and straight corrugated board; the double face corrugated board output by the drying device 3 is cut into predetermined size pieces of double face corrugated board after passing through a slitter 4 and an nc cutter 5, then forming a paper pile 7 by a stacker 6.
In above corrugated cardboard manufacturing process, usually rolled paper is pressed into corrugated shape first, then glued to backing paper to forming a single face corrugated board, then glued to face paper to forming a double face corrugated board after gluing on the corrugation; and then the corrugated board, after being dried, is cut into predetermined size pieces of double face corrugated board, lastly forming a paper pile by a stacker. Therein, the relative position of the single face corrugated board and the face paper is that the face paper is arranged under the corrugated board. Thus, during drying the double face corrugated board, the face paper is always under the corrugated board, thus the face paper is in direct contact with a high-temperature hot plate of a drying part, which causes defects such as discoloration and scratches on the face paper. Such defects on the face paper are not obvious when yellow board or common white board without printed patterns are adopted. However, when white board with printed patterns or coated white board are adopted, said defects become conspicuous; not merely the board color is changed,but also the printed patterns tone is distorted and scratches are caused on the color surface. If the color surface is coated with gloss oil, the polishing will be damaged, and if with a plastic film, the plastic film will melt and deform. Therefore, the gluing manner that the face paper is arranged under the corrugated board can not adapt to manufacturing the pre-printed color surface corrugated boards.