| 摘要 |
<p>A dry-laid composite web being an intermediate product for thermoforming of three- dimensionally shaped objects, comprising 40-95 wt-% CTMP fibres, 5-50 wt-% thermoplastic material, and 0-10 wt-% additives, the dry-laid composite web having been impregnated with a dispersion, an emulsion, or a solution containing the thermoplastic material and dried, obtaining a density of 50-250 kg/m3, or, if compressed by calendaring 400-1000 kg/m3, and a process for producing web comprising the steps of: forming a dry-laid web comprising CTMP fibres; adding thermoplastic material to the web by impregnation, wherein the thermoplastic material is added in the form of a dispersion, an emulsion, or a solution in an amount to reach 5-50 wt-% thermoplastic material based on the total dry weight of the web; drying; and making rolls or sheets thereof, and a process for producing 3D-object from the intermediate web comprising the steps: optionally, in the case of the composite intermediate web being calendared, swelling of the web by means of wetting with water, followed by drying; heating and introducing the web into a thermoforming tool having the desired shape; forming the web in the thermoforming tool by pressing at a pressure of 1-200 MPa, or by utilizing a vacuum pressure; releasing the thereby obtained three-dimensionally shaped object from the thermoforming tool, and a thermoformed 3D object.</p> |
