Abstract: A method for recovering cellulosic fibres from thermoplastic-fibreboard laminates such as fruit juice and milk cartons. The method involves heating the laminate in a pulping liquor to a temperature equal to or greater than the softening point of the thermoplastic material. This is followed by cooling to a temperature below the softening point and defibration by mechanical or explosive means. The method results in a mixture of thermoplastic fragments and cellulosic fibres which can be readily separated by conventional means. Pressure may be applied to the laminate/liquor system to accelerate the process.

Abstract: In the recovery of cellulosic fibre of papermaking quality from foil laminated papers and boards, the laminate is heated and pressurized in the presence of an aqueous liquor, subjected to rapid discharge to a lower pressure environment under reduced pressure and optionally subjected to mechanical agitation. This treatment provides a product stream which can be separated into cellulosic fibre suitable for the further manufacture of fibrous cellulosic articles and a metallic foil suitable for subsequent manufacture of metallic articles.

Abstract: A uniquely designed nozzle is described for assisting the liberation of fibres from cellulosic material during an explosive defibration process. The nozzle is constructed with a plurality of internal bars so as to provide a tortuous path to the material passing therethrough from a region of high pressure to a region of low pressure.