FIELD: paper production; cellulose production.
SUBSTANCE: invention relates to production of shaped tray or tray from fibrous material. Method involves the following steps: (i) obtaining fibrous cellulose, in which the fibres consist of at least 85 wt. % softwood fibres having a mean fibre length of at least 2.0 mm and not more than 15 wt. % of paper rejects having fibre length of 0.05–1.0 mm, (ii) converting cellulose to a foamed suspension, (iii) feeding a foamed suspension from the pressure box onto a forming screen of the cardboard machine for forming a fibrous web, (iv) drying the web to produce a dried web having compressibility in a thickness direction of at least 20 %, and (v) inserting the web as a layer into a cardboard which is converted into a tray or plate by thermo pressing or deep drawing.
EFFECT: enabling formation of shaped three-dimensional trays and plates without cracks.
11 cl, 1 ex
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