Verfahren und Einrichtung zur Herstellung von Faserplatten sowie nach diesem Verfahren und mit dieser Einrichtung hergestellte Platten

1,177,795. Double-Belt moulding; laminates. OWENS-CORNING FIBERGLAS CORP. 24 Jan., 1967 [14 Feb., 1966], No. 3558/67. Headings B5A and B5N. [Also in Division B2] Fibre-board is surface-finished by coating the surface with an adhesive comprising a resin or starch, pressing the coated surface against a moving moulding surface with sufficient pressure to deform the surface fibres, and simultaneously hardening the adhesive to hold the fibres in their deformed condition and form a high density skin. The fibre-board can be phenol-formaldehyde resin bonded glass fibres. The adhesive resin can be a urea-melamineformaldehyde resin or phenol-formaldehyde resin. The resin can be applied as an aqueous suspension or dispersion or as a coating on particulate material, e.g. sand (see Figs. 8 and 9, not shown). The adhesive resin may be applied to only selected areas of the fibreboard. The adhesive resin can contain a pigment, e.g. CaCO 3 and/or TiO 2 , (see Fig. 5, not shown), or fibres, e.g. of asbestos. The application of pressure can produce an embossed or smooth surface. A mat, strands, woven cloth or scrim of glass fibres or filaments or a mat of tea bag paper or Vinyon (Trade Mark) fibres can be applied to the board before application of the adhesive, see Figs. 6 and 10, not shown, or the mat can be prebonded with thermoplastic resin. Alternatively the mat can be dip-coated with the adhesive resin. The glass strands of the scrim can be bonded by starch or plastics. The fibre-board, with or without scrim reinforcement, can be surfaced with a wood-grain printed polyvinyl chloride film, see Fig. 7, not shown. The fibre-board can be painted with white paint. As shown, the fibre-board is fed on conveyer 46 past resin applicator 48, on to conveyer 12. The mat or scrim can be fed from roll 102. Conveyer 12 comprises a plurality of springs 40 mounted on parallel T bars 26, the ends of which are attached to chain links 28. The adhesive coated top surface of the board presses against moving belt 50. The position of belt 50 can be adjusted by movement of channels 62 bearing on platten 52. Belt 52 is preferably made of polytetrafluoroethylene. The conveyer 12 passes through and under oven 10 heated by a gas burner supplying hot air to chambers 80 and 82. The board can be cooled on emergence from the oven by blower 88. Belt 50 is cooled by coils 96.