Method of making a composite structure
AssigneePlascon Technologies (Proprietary) Limited
InventorMichael W. Symons
Life of this patent
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Abstract
A method of making a composite structure from two first sheets of a natural fibre material such as paper and a second corrugated sheet of a natural fibre material such as paper, the second sheet being sandwiched between the two first sheets, includes the steps of impregnating the sheets with a liquid composition comprising a thermosetting resin such as a phenolic resin, an extending liquid for the thermosetting resin and a catalyst for the thermosetting resin, locating the second sheet between the two first sheets and polymerising the thermosetting resin to join the second sheet to the two first sheets to form the composite structure. The composite structure is of use in the building and packaging industry.
Claims9
A method of making a composite structure comprising two or more first sheets of a natural fibre material and one or more second corrugated sheets of a natural fibre material, the or each second corrugated sheet being sandwiched between two adjacent first sheets, includes the steps of:
- (1) impregnating the first and second sheets with a liquid composition comprising a thermosetting resin, a nonreactive extending liquid for the thermosetting resin and a catalyst for the thermosetting resin, said liquid composition being selected from the group consisting of (a) a phenolic resin, 20-100% by weight of the phenolic resin of a C.sub.1 --C.sub.4 alcohol and catalyst for phenolic resin, and (b) a polyester resin or an epoxy resin, 20-100% by weight of the resin of an extending liquid selected from the group consisting of dichloromethane, trichloroethylene, perchloroethylene, trichlorobromine, fluorotrichloromethane and trichlorotrifluoroethane and a catalyst for the resin;
- (2) locating the or each second corrugated sheet between two adjacent first sheets;
- (3) after step 2 recovering the extending liquid;
- and
- (4) after step 3 polymerizing the thermosetting resin to join the or each second corrugated sheet to the first sheets to form the composite structure.
Dependencies are inferred from the claim text.