FREMGANGSMAADE TIL FREMSTILLING AF BOELGEPAP

• Main Authors: MARTINI E, LORI D, CREDALI L
• Format: Patent
• Language: Danish
• Published: 03.01.1982
• Edition: 3
• Subjects: IMPREGNATING OR COATING OF PAPER; 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; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER

A cardboard of the corrugated type is prepared using as at least one liner(4) and as corrugated medium(8) a fibrous material consisting either totally or partially of thermoplastic synthetic fibres, and making the liner adhere to the tips of the corrugations of the corrugated medium by thermo-adhesion, wherein there is inserted between the surface of the liner to be adhered and the tips of the corrugations of the corrugated medium a film(5) of thermoplastic polymer having the following characteristics : (a) a melting temperature lower than that of the thermoplastic polymer constituting the synthetic fibres present in the liner and in the corrugated medium; (b) a viscosity of less than 1 x 10 poises, measured at a temperature of from a temperature exceeding by 10 DEG C its melting temperature to a temperature exceeding by 20 DEG C the melting temperature of the thermoplastic polymer constituting the synthetic fibres; (c) a surface tension not exceeding by more than 5 dynes/cm the surface tension of the thermoplastic polymer constituting the synthetic fibres, measured at the same temperature; (d) a solubility parameter at 25 DEG C in a ratio of from 0.85:1 to 1:15:1 to the solubility parameter of the thermoplastic polymer constituting the synthetic fibres; and wherein the adhesion of the liner to the corrugated medium is carried out at a temperature at which no deformation of the corrugated medium occurs which is from a temperature exceeding by 10 DEG C the melting temperature of the thermoplastic polymer constituting the film to a temperature exceeding by 20 DEG C the melting temperature of the thermoplastic polymer constituting the synthetic fibres present in the liner and in the corrugated medium.