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AssigneeLenzing Aktiengesellschaft
InventorsMarkus Pichler, Christian Sperger
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The invention relates to a molding tool (1, 51) for the extrusion of cellulosic molded bodies (4) from a spinning dope (2), having an entry side (6, 56) and an exit side (7, 57) for the spinning dope (2), with at least one nozzle body (8, 58a, 58b, 58c) including a planar carrier (9, 59a, 59b, 59c) with extrusion openings (10, 60) that penetrate the carrier from the entry side (6, 56) to the exit side (7, 57) and have a mouth diameter (12, 62) at the exit side (7, 57) and through which the spinning dope (2) is extruded into the cellulosic molded bodies (4). In order to provide a molding tool of the afore-mentioned type, which is easier and more inexpensive to manufacture while providing excellent strength and pressure stability at the same time, it is proposed that the ratio of the thickness (13, 63) of the carrier (9, 59a, 59b, 59c) to the mouth diameter (12, 62) of the extrusion openings (10, 60) at the exit side (7, 57) be at least 6:1, preferably at least 10:1, and that the extrusion openings (10, 60) be formed in the carrier (9, 59a, 59b, 59c) by applying laser energy.
A molding tool for the extrusion of cellulosic molded bodies from a cellulose-containing spinning dope comprising an entry side and an exit side for the cellulose-containing spinning dope, with at least one nozzle body including a planar carrier with extrusion openings that penetrate the carrier from the entry side to the exit side and have a mouth diameter at the exit side and through which the cellulose-containing spinning dope is extruded into the cellulosic molded bodies, wherein a ratio of the thickness of the carrier to the mouth diameter of the extrusion openings at the exit side is at least 6:1, and that the extrusion openings were formed in the carrier by applying laser energy.
Dependencies are inferred from the claim text.