B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/72.16
B32B 3/28 (2006.01) B31F 1/28 (2006.01) B32B 27/08 (2006.01)
Patent
CA 1168143
ABSTRACT OF THE DISCLOSURE A cardboard of the corrugated type is prepared using as at least one liner and as corrugated medium a fibrous material consisting at partially of thermoplastic synthetic fibres, and making the liner adhere to the tips of the corrugations of the corrugated medium by thermo- adhesion, wherein between the surface of the liner to be adhered and the tips of the corrugations of the corrugated medium a film of a second thermoplastic polymer having the following characteristics is inserted; a melting temperature lower than that of the first thermoplastic polymer constitut- ing the synthetic fibres; a viscosity of less than 1 x108 poises, measured at a temperature of from a temperature ex- ceeding by 10°C its melting temperature to a temperature ex- ceeding by 20°C the melting temperature of the first thermoplastic polymer; a surface tension not exceeding by more than 5 dynes/cm the surface tension of the first thermo- plastic polymer, measured at the same temperature; and a solubility parameter at 25°C in a ratio of from 0.85:1 to 1;15:1 to the solubility parameter of the first thermoplastic polymer; and wherein the adhesion of the liner to the cor- rugated medium is carried out at a temperature at which no deformation of the corrugated medium occurs which is from a temperature exceeding by 10°C the melting temperature of the thermoplastic polymer-constiuting the film to a temperature exceeding by 20°C the melting temperature of the first thermoplastic polymer.
380074
Credali Lino
Lori Domenico
Martini Emilio
Cartopiave S.p.a.
Marks & Clerk
Montedison S.p.a.
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