Molding tool and method for producing a molding tool for extruding cellulose molded bodies
A technology of cellulose and moldings, applied in the field of molding tools and molding tools for extruding cellulose moldings, which can solve problems such as expensive manufacturing processes, very expensive materials, and limited shape of profiles, and achieve improvement Stability and strength, avoidance of dead zones, cost-effective effect
Inactive Publication Date: 2021-10-15
LENZING AG
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Problems solved by technology
However, such a forming tool has the disadvantage that the materials used here are very expensive and the assembled forming tool is subject to a very expensive manufacturing process, since the small plates need to be subsequently inserted into the carrier and connected to this carrier
However, the extruded openings introduced into the carrier by means of the electron beam are strongly restricted in their profile shape and have a high dispersion (Streuung) or tolerance in their mouth diameter, since the electron beams can only be controlled and repeated to a limited extent. beam effect
Furthermore, the introduction of extrusion openings has to be realized in a high vacuum by means of an electron beam, which in turn requires an expensive manufacturing process
Method used
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Embodiment Construction
[0032] exist figure 1 shows an annular forming tool 1 according to a first embodiment of the invention, which is formed according to Figure 5 and used in the method for extruding cellulose moldings 4. The forming tool 1 has an inlet side 6 for the spinning dope 2 and an outlet side 7 for the extruded spinning dope 3 (see Figure 5 ). Furthermore, a nozzle body 8 with a planar carrier 9 is arranged in the molding tool 1 . In this case, the nozzle body 8 can be formed in one piece with the rest of the forming tool 1 (eg by deep drawing, milling, etc.), or can be connected in another way with a material fit to the remaining forming tool (eg, by welding, etc. ).
[0033] The carrier 9 has an extrusion opening 10 , which penetrates the carrier from the inlet side 6 towards the outlet side 7 . On the outlet side 7 , the extrusion opening 10 forms a mouth 11 with a mouth diameter 12 . In this case, the size of the mouth diameter 12 decisively influences the titer (or diameter)...
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Abstract
The invention relates to a molding tool (1, 51) for extruding cellulose molded bodies (4) from a spinning material (2). The molding tool comprises an inlet side (6, 56) and an outlet side (7, 57) for the spinning material (2), and at least one nozzle body (8, 58a, 58b, 58c), having a flat support (9, 59a, 59b, 59c) with five extrusion openings (10, 60) which pass through the support from the inlet side (6, 56) to the outlet side (7, 57) and have an opening diameter (12, 62) on the outlet side (7, 57) and through which the spinning material (2) is extruded in order to form the cellulose molded bodies (4). The aim of the invention is to provide a molding tool of the aforementioned type which is simpler and less expensive to produce and at the same time has excellent durability and pressure stability. This is achieved in that the ratio of the thickness (13, 63) of the support (9, 59a, 59b, 59c) to the opening diameter (12, 62) of the extrusion openings (10, 60) on the outlet side (7, 57) is at least 6:1, preferably at least 10:1, and the extrusion openings (10, 60) are introduced into the support (9, 59a, 59b, 59c) by applying laser energy.
Description
technical field [0001] The invention relates to a forming tool for extruding cellulose shaped bodies from a spinning dope, the forming tool having an inlet side and an outlet side for the spinning dope, having at least one nozzle body with a surface Shaped carrier, the carrier has an extrusion opening that penetrates the carrier from the inlet side toward the outlet side and has a mouth diameter at the outlet side, and the spinning solution is extruded into cellulose molding through the extrusion opening body. [0002] Furthermore, the invention relates to a method for producing a shaping tool and a method for producing cellulose shaped bodies with said shaping tool. Background technique [0003] Forming tools (also called "spinning nozzles" or "spinnerettes") for extruding cellulose shaped bodies of the type mentioned at the outset usually have to meet a number of high quality standards in order to be suitable for Used for spinning highly viscous cellulose solutions. Thu...
Claims
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IPC IPC(8): D01D4/02D01F2/00
CPCD01D4/022D01F2/00
Inventor M·皮赫莱尔C·斯帕格尔
Owner LENZING AG