AN APPARATUS FOR PRODUCING A PLASTIC CORRUGATED BOARD AND A PROCESS THEREFOR

• Main Authors: TSURU N, ITO T
• Format: Patent
• Language: English
• Published: 29.08.1973
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER; MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD ORMATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; PERFORMING OPERATIONS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER

A process for producing a plastic corrugated board and an apparatus therefor, wherein a molten thermoplastic resin is extruded through a flat die to form a flat sheet; the flat sheet thus extruded is then directed to a pair of opposed corrugate-surfaced rolls for passage of the sheet through a gap formed therebetween, after the temperature of said flat sheet has been adjusted by means of touch rolls, thereby forming a corrugated core sheet the configuration of said gap accomodating the cross-sectional configuration of the corrugated core sheet; a flat sheet of a thermoplastic resin extruded from another die is laid on said corrugated core sheet mounted on the corrugate-surfaced roll, and at the same time said flat sheet is press-adhered to the corrugated core sheet by cool air blown onto the joining portions thus forming a single-face corrugated board; the single-face corrugated board is then reversely mounted on a flat roll where a flat sheet of a thermoplastic resin extruded from still another die is laid on the corrugated core sheet of said single-face corrugated board so that the former may be pressed onto the latter for adhesion by cool air blown onto the joining portions thereof, thereby providing a double-face corrugated board; and then each of the two sides of the double-face corrugated board is cooled separately by means of a cooling means, thereby insuring flatness of said corrugated board.