JP2022521990A - Molding Tools for Extruding Cellulose Molds and Methods for Manufacturing Molding Tools - Google Patents

Abstract

The present invention has an inlet side (6,56) and an outlet side (7,57) for the spinning dope (2) and penetrates the carrier from the inlet side (6,56) to the outlet side (7,57). Flat with a diameter (12, 62) on the outlet side (7, 57) and an extruded opening (10, 60) through which the spun dope (2) extruded into the cellulose compact (4) passes. Molded to have at least one nozzle body (8, 58a, 58b, 58c) including carriers (9, 59a, 59b, 59c) and to extrude a cellulose compact (4) from a spinning dope (2). Regarding tools (1, 51). Extruded openings (10, 60) on the outlet side (7, 57) to provide the above-mentioned types of forming tools that are easier and cheaper to manufacture while at the same time providing excellent strength and pressure stability. The ratio of the thickness (13,63) of the carrier (9,59a, 59b, 59c) to the caliber (12,62) is at least 6: 1, preferably at least 10: 1, and the extrusion opening ( It is proposed that 10,60) are formed in the carriers (9,59a, 59b, 59c) by applying laser energy.

Description

The present invention has an inlet side and an outlet side for spinning dope, penetrates the carrier from the inlet side to the outlet side, has a diameter on the outlet side, and allows the spinning dope extruded into the cellulose molded product to pass through. The present invention relates to a molding tool having at least one nozzle body including a flat carrier having an extrusion opening and for extrusion molding a cellulose molding from a spinning dope.

The present invention also relates to a method for manufacturing a molding tool and a method for manufacturing a cellulose molded product using the molding tool.

Typically, the molding tools used for extrusion molding of the above-mentioned types of cellulose moldings (also known as "spinning nozzles" or "spinning caps") are suitable for spinning highly viscous cellulose solutions. , Must meet many high quality standards. High standards for quality and dimensional accuracy (profile shape, diameter, and positioning) of the extruded openings, for example, to obtain a homogeneous bundle of moldings and to avoid adhesion of individual moldings to the bundle of moldings. Must be satisfied. In addition, the roughness of the inner wall of the extruded opening, as well as the sharpness and lack of burrs at the edges of the extruded opening, when molding the molded body (formed from the spun dope extruded on the outlet side of the extruded opening). , And play an important role in avoiding spinning defects (such as breakage, tearing, or sticking to each other) caused by irregularities or burrs in the extruded openings on the outlet side, for example. Also, high standards must be met for the strength of the forming tool as it is exposed to very high pressures of up to 150 bar during extrusion of the spinning dope.

From EP0430926B1 and WO94 / 28211A1, molding tools for extruding cellulose compacts from spinning dope are known, which can be used in methods for producing cellulose compacts such as the viscose or lyocell method. can. In these cases, the extruded openings are typically formed in the carrier by mechanical drilling or punching. However, this assumes that, on the one hand, the material of the carrier must have sufficient ductility, and as a result, on the other hand, it is machined with a drill or punch tool. It can and must permanently withstand very high pressures of up to 150 bar in the viscose or lyocell method. In EP0430926B1, these requirements are met, for example, by inserting a small plate made of a softer, easier machined material (such as gold, silver, or tantalum) into a stainless steel carrier. Extruded openings are formed in the small plates. The special combination of materials facilitates the formation of extruded openings in molding tools and can provide high levels of strength. However, such molding tools are labor intensive because the materials used for them are very expensive and small plates need to be inserted and connected to the carrier at a later stage. It has the disadvantage of requiring a manufacturing process. In addition, mechanical machining processes such as drilling and punching create burrs in the extrusion openings that need to be removed by additional elaborate finishing steps (eg, by polishing). Also, such mechanical machining processes can only achieve limited positioning accuracy and reproducibility, which will generally result in large tolerances at the extrusion openings.

WO2005 / 005695A1 shows a method of manufacturing the above-mentioned type of molding tool, and the extrusion opening is formed in the carrier of the molding tool by an electron beam. Molding tools manufactured in this way can form the extrusion openings directly in the carrier, thus solving the problem of material selection and thereby forming the extrusion openings separately in a small plate. This eliminates the need for time-consuming assembly of the components and subsequent components. In addition, by using an electron beam, such extruded openings formed within the forming tool exhibit an advantageously reduced roughness and high edge sharpness with minimal burrs. However, since the effects of the electron beam can only be controlled and reproduced to a limited extent, the extruded openings formed within the carrier by using the electron beam are highly limited in its profile shape and with respect to its caliber. , There are large variations and tolerances. Further, the formation of the extruded opening by using the electron beam must be performed in high vacuum, which means a laborious manufacturing method.

Therefore, it is an object of the present invention that it can be manufactured more easily and cheaply while providing excellent strength and pressure stability, the extruded openings having smaller tolerances in terms of diameter, position and profile shape. It is to provide the above-mentioned type of molding tool.

The present invention is that the ratio of the thickness of the carrier to the diameter of the extruded opening on the outlet side is at least 6: 1 and that the extruded opening is formed in the carrier by applying laser energy. So, solve the specified purpose.

Produce a high-strength nozzle body with particularly pressure stability that guarantees a long service life at high pressures when the ratio of carrier thickness to the diameter of the extruded opening on the outlet side is at least 6: 1. Can be done. This pressure stability means that plastic deformation of the nozzle body can be avoided during its useful life under normal operating conditions, while a small amount of load-dependent elastic deformation is unavoidable. This intensity can be further improved if the above ratio is at least 10: 1, more preferably at least 12: 1, or at least 15: 1. Further, if the extrusion opening is formed in the carrier by applying laser energy, the molding tool can prove advantageous by being very easy to manufacture. In this case, the extrusion openings can be formed in the carrier of the molding tool with very high dimensional accuracy, which can create a molding tool that meets high quality requirements and narrow dimensional tolerances with respect to diameter and positioning. can. In particular, the use of laser radiation makes it possible to obtain dimensional tolerances of less than 2% for important parameters such as aperture, hole geometry, and cross section of the extruded openings, as well as the distance between the extruded openings. .. Laser radiation also makes it possible to directly produce smooth, burr-free extruded openings, thus eliminating additional finishing steps on molding tools. Such finishing processes, such as grinding or polishing, involve high mechanical loads and can cause adverse stress effects within the carrier. Therefore, it is possible to produce molding tools with small dimensional tolerances that are particularly easy to manufacture and reliable.

Within the scope of the invention, the term "mold" specifically means a filament exiting an extruded opening, which can subsequently be used in the production of continuous or staple fibers. Within the scope of the invention, such filaments or fibers preferably have a titer of 0.7 dtex or higher.

In general, the present invention relates to a molding tool for producing a regenerated cellulose molded product, in which the diameter of the extruded opening on the outlet side is 40 μm or more, particularly 45 μm or more, preferably 50 μm or more, more preferably 70 μm to 150 μm. Please note that. When the caliber is less than 40 μm, the forming tool is particularly suitable for producing microfibers having a fiber titer of less than 0.7 dtex. However, the molding tool of the present invention is typically used for the production of cellulose fibers having a titer of 0.7 dtex or higher, for which an extruded opening having a diameter larger than 40 μm is suitable.

If the thickness of the carrier is at least 600 μm, it is possible to create a molding tool characterized by sufficient strength and service life of the nozzle body, which is also sufficient to provide a favorable production throughput. It can be designed large. In particular, the preferred thickness of the carrier is at least 800 μm, more preferably 1000 μm. When the carrier has a thickness in this range, for example, in a method for producing a lyocell-type (lyocell method) regenerated cellulose molded product, plastic deformation of the carrier in normal operation at an operating pressure of up to 100 bar, which is usually encountered. Can be ensured that there is no. After all, the plastic deformation of the carrier can adversely change the geometry of the extruded opening and also negatively affect the discharge behavior of the part from the molding tool. In addition, it can be assured that the carrier can even be loaded with a pressure of up to 150 bar in an overpressure event without damage to the carrier or irreversible structural damage. Such methods because molding tools containing carriers with a thickness of less than 600 μm do not have the strength required to permanently withstand high pressures and each allow only a very limited amount of processing. Has limited suitability for use in.

If the extruded opening on the outlet side has no burrs, a molding tool can be created in which the compacts avoid adverse sticking to each other after exiting the extruded opening. After all, the burrs in the extruded opening have the drawback that the extruded body does not exit the extruded opening in a linear orientation, but are diverted by the burrs and contacted and fixed together with the adjacent molded body thereby. , Leading to the production of spinning defects or failing products that require interruption and resumption of the process (updated spin-up).

Particularly versatile molding tools for use in various methods for extrusion molding of cellulose moldings can be made when the nozzle body is configured to have an annular or rectangular shape. In addition, the molding tool can include some of such nozzle bodies. This allows, for example, the forming tool to include several rectangular nozzle bodies adjacent to each other. Such molding tools are, for example, particularly easy to manufacture and can be more cost effective.

If the forming tool is tightly connected to the nozzle body by material bonding and has at least a first web protruding from the nozzle body towards the inlet side, on the other hand, because the web resists the pressure load of the nozzle body and especially the carrier. The web provides a guide surface for the spinning dope so that the stability and strength of the carrier can be further improved, while the efficient transport of the spinning dope to the extrusion opening can be ensured. In addition, proper configuration of the web helps to avoid the formation of dead spaces and thus improves the quality of the part drawn by it.

If the forming tool has at least a second web and a nozzle body extending between the first web and the second web, the strength of the carrier can still be substantially increased. Like the first web, the second web is firmly connected to the nozzle body by material bonding and projects from the nozzle body toward the inlet side. Therefore, the first and second webs can, in particular, act as the veranda support of the nozzle body and thus reliably absorb the pressure loads acting on the carriers during extrusion. In addition, the first and second webs can be combined together to form a passage for guiding the spinning dope on the inlet side. In this way, a particularly reliable and durable molding tool can be made.

Molding tools have been found to be particularly advantageous when at least a portion of the web extends substantially perpendicular to the nozzle body. Due to the portion extending substantially perpendicular to the nozzle body, the spinning dope can be largely oriented towards the extrusion opening and thus a directional mass flow rate can be maintained.

When the normal distance of the longitudinal extension of the nozzle body between the first and second webs is at least 100 times the thickness of the carrier, the forming tool is excellent against high pressure deformation of the spinning dope. Through stability and resistance, it could be proven to be effective.

Advantageously, the first web can completely surround the second web, and thus can provide a molding tool with a particularly simple design. This is particularly suitable for use in, for example, a molding tool having an annular nozzle body, where the annular nozzle body extends between the first and second webs.

If, on the inlet side, the forming tool also includes a flange with at least one flange rim and the flange rim is adjacent to the web, a forming tool that is easy to handle and replace can be created. It can be quickly and easily attached to the spinning machine via the flange. If the flange rim projects outward from the forming tool, it can also ensure that the spinning dope can flow freely from the inlet side to the nozzle body without hindrance, thereby ensuring uniform extrusion by the forming tool. Can be done.

With respect to the method for manufacturing the forming tool according to any one of claims 1 to 11, an object of the present invention is to provide a simple and cost effective method while achieving high accuracy. Is.

The object of the manufacturing method is solved by the subject matter of claim 12.

By applying laser energy from the inlet side of the molding tool to it, an extrusion opening is formed in the carrier and a burr-free extrusion opening is formed in the carrier without further finishing on the exit side. Is manufactured according to one of claims 1-11, it is possible to make a particularly simple and reproducible manufacturing method for molding tools. By using laser radiation, the laborious finishing of the extrusion openings is eliminated and the extrusion openings formed directly in the carrier can meet all the quality standards required for molding tools. This also applies to the roughness of the extrusion opening, the release from burrs, the positioning accuracy, and the opening diameter. When laser energy is applied to the carrier in the form of pulsed laser radiation, particularly small manufacturing tolerances in the extrusion openings can be met. Laser radiation with a pulse duration of 100 fs to 100 ns and a pulse energy of 1 μJ to 1000 μJ has proven to be particularly suitable. In this regard, pulsed laser radiation can preferably be applied to carriers in a striking or spiral drilling process, thus creating an extrusion opening with high precision and small manufacturing tolerances.

A particularly reliable and reproducible manufacturing method can be provided where the extruded openings are formed in the carriers after the carriers are firmly attached to the web by material bonding. The formation of a tight material bond connection between the carrier and the web inevitably exposes the carrier material to mechanical loads, thus leading to unwanted deterioration or modification of the extruded opening. In particular, if the formation of the extruded opening is performed as the final final procedural step, then the extruded opening is formed by forming the extruded opening in a fully assembled or completed molding tool. Such mechanical load can be avoided.

The molding tool according to any one of claims 1 to 11 is a regenerated cellulose molded product in which a cellulose-containing spinning dope is extruded by the molding tool and precipitated in a spinning bath in order to produce a molded product. It turns out to be particularly advantageous when used in methods for manufacturing.

Preferably, such a method may be a lyocell method in which the spinning dope contains a tertiary amine oxide in which the cellulose is dissolved and the spinning bath comprises a mixture of water and the tertiary amine oxide.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 of the molding tool according to the first embodiment. FIG. 2 is a plan view of the molding tool of FIG. FIG. 3 is a cross-sectional view taken along the line II-II of FIG. 4 of the molding tool according to the second embodiment. FIG. 4 is a plan view of the molding tool of FIG. FIG. 5 is a partially cutaway sectional view of a spinning machine provided with the molding tool of the present invention of FIG.

FIG. 1 shows an annular molding tool 1 according to the first embodiment of the present invention, and the annular molding tool 1 is used in the extrusion molding method of the spinning device 100 and the cellulose molded body 4 of FIG. 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 FIG. 5). Further, the forming tool 1 is provided with a nozzle body 8 provided with a flat carrier 9. In this case, the nozzle body 8 may be integrally formed with the remaining forming tool 1 (for example, by deep drawing, milling, etc.), or may be firmly connected by another method (for example, by welding, etc.) by material bonding. can do.

The carrier 9 includes an extruded opening 10 that penetrates it from the inlet side 6 to the outlet side 7. On the outlet side 7, the extruded opening 10 forms a port 11 having a diameter of 12. In this case, the size of the caliber 12 has a decisive effect on the titer (or diameter) of the extruded cellulose molding 4. Further, the extrusion behavior and the geometric shape of the molded body 4 can be controlled via the cross-sectional shape of the extrusion opening 10. For example, it is used to change the ejection behavior of the spun dope 2 from the extruded opening 10 to prevent the extruded spin dope 3 from sticking to each other prior to precipitation in the spinning bath 5. can do. In this case, the preferred cross-sectional shape of the extruded opening 10 may have a configuration that tapers toward the outlet side 7, as shown in FIG. However, the cross-sectional shape can be arbitrarily changed by laser radiation, for example, so that an hourglass shape extending toward the outlet side 7 can be configured.

The extruded opening 10 has a diameter 12 of 70 to 150 μm. Such a diameter 12 can ensure that the fiber or filament having a titer greater than 0.7 dtex is produced as the extruded cellulose molded body 4. In another preferred embodiment of the invention, regenerated cellulose fibers having a titer of 1.0 to 2.5 dtex are produced.

The ratio of the thickness 13 of the carrier 9 to the diameter 12 of the extrusion opening 10 is at least 6: 1 thereby ensuring sufficient resistance of the carrier 9 to the high pressure exerted by the spinning dope 2. In a more preferred embodiment of the invention, a ratio of at least 10: 1, at least 12: 1, or at least 15: 1 is selected.

The thickness 13 of the carrier 9 is at least 600 μm. In this way, the carrier 9 can permanently withstand a pressure load of up to 150 bar from the inlet side 6. In another embodiment, the preferred thickness 13 of the carrier 9 is at least 800 μm, preferably 1000 μm, in order to ensure a particularly high resistance of the carrier 9.

The extrusion opening 10 was formed by applying laser energy to the carrier 9 and allowing the laser energy to act on it. This makes it easy to manufacture the forming tool 1 by a technical process. In addition, the action of the laser radiation on the material of the carrier 9 achieves particularly high dimensional accuracy in positioning, dimensions, and the geometry of the extruded opening 10. In particular, the extruded openings 10 have a constant average distance 14 of 50 to 1000 μm from each other, and the standard deviation of the distance 14 is 1% or less. A larger distance 14 of 250-800 μm is usually used to prevent the fibers from sticking to each other as they exit the extruded opening 10. In this regard, the extruded openings 10 may be arranged to be distributed on the carrier 9 in any regular pattern (eg, radial, grid, etc.) or irregularly. Laser radiation also makes it possible to obtain a standard deviation of aperture 12 of less than 2%. In addition, the extruded opening 10 formed in the carrier 9 by using laser radiation does not have burrs on the outlet side 7 immediately after formation, thus adversely affecting the geometry of the extruded opening 10. There is no need to undergo additional finishing steps such as grinding or polishing that may have an impact. In particular, the smooth extruded openings 10 without burrs also ensure that the individual strands of the extruded spinning dope 3 do not stick to each other before settling into the compact 4 in the spinning bath 5.

As shown in FIGS. 1 and 2, the forming tool 1 having the annular nozzle body 8 includes a first web 15 and a second web 16, both of which are firmly connected to the annular nozzle body 8 by material bonding. ing. Thus, the webs 15 and 16 are tightly connected to, for example, the forming tool 1 is deep drawn or configured to be integrally milled, or by material bonding such as welding. By doing so, for example, it can be integrally formed with the carrier 9 of the nozzle body 8. In this case, the annular nozzle body 8 extends between the first web 15 and the second web 16. The webs 15 and 16 project from the nozzle body 8 toward the inlet side 6. Due to the robust material binding connection to the nozzle body 8, the webs 15 and 16 act as the veranda support of the carrier 9 thereby being able to withstand the higher pressure loads due to the spinning dope 2. Due to the annular configuration of the nozzle body 8, the first web 15 completely surrounds the second web 16 and the nozzle body 8. Therefore, the two webs 15 and 16 always extend parallel to each other and maintain a constant normal distance 17 to each other along the carrier 9 in the transverse direction with respect to the longitudinal extension 18 of the nozzle body 8. In this case, in order to secure the maximum stability of the nozzle body 8, the normal distance 17 is 100 times or less the thickness 13 of the carrier 9.

Inside the forming tool 1, the webs 15 and 16 act as guide surfaces 19 of the spinning dope 2, which favorably supports the flow behavior of the highly viscous spinning dope 2 and forms a dead space in the forming tool 1. To prevent. Therefore, the webs 15 and 16 form a guide passage 20 for the spinning dope 2 starting from the inlet side 6. Preferably, the webs 15 and 16 extend perpendicular to the nozzle body 8 and thus perpendicular to the carrier 9, as shown in FIG.

Further, the forming tool 1 includes a flange 23 to which the forming tool 1 is connected to the spinning device 100, as shown in FIG. In this case, the flange 23 includes two flange rims 21, 22 each adjacent to the webs 15 and 16 at the inlet side 6 and projecting outward from the webs 15 and 16, and thus from the forming tool 1. Therefore, the flange rims 21 and 22 do not interfere with the guide passage 20 for the spinning dope 2, and thus reliably avoid adversely affecting the flow state in the guide passage 20.

3 and 4 show a molding tool 51 according to a second embodiment, including several rectangular nozzle bodies 58a, 58b, 58c. Similar to the forming tool 1, the forming tool 51 can be used as a method for extrusion molding the spinning device 100 and the cellulose molded body 3 of FIG. Similar to the description of the first embodiment, the forming tool 51 includes an inlet side 56 for the spinning dope 2 and an outlet side 57 for the extruded spinning dope 3 (see FIG. 5).

In this case, the molding tool 51 includes three nozzle bodies 58a, 58b, 58c, and each nozzle body includes flat carriers 59a, 59b, 59c. It is generally mentioned that the forming tool 51 does not have to be limited to the three nozzle bodies as shown in FIGS. 3 and 4. Rather, any other number and arrangement of nozzle bodies in the forming tool is possible.

In this case, the nozzle bodies 58a, 58b, 58c are firmly connected to the remaining forming tool 51 by material bonding, preferably by a welded portion 73. The carriers 59a, 59b, 59c each include an extruded opening 60 that penetrates them from the inlet side 56 to the outlet side 57 and is formed through the action of laser radiation on them. At the outlet side 57, each of the extruded openings 60 forms a mouth 61 having a diameter 62. As described for the first embodiment, the caliber 62 can be varied to change the titer of the extruded cellulose molding 4. The preferred diameter 62 of the extruded opening 60 is 70-150 μm for producing the cellulose molded body 4, in particular a fiber having a titer greater than 0.7 dtex. Further, by forming the extruded opening 60 by laser radiation, a standard deviation of diameter 62 of less than 1% is obtained. More preferably, it is used to produce regenerated cellulose fibers with a titer of 1.0-2.5 dtex. Further, as described in the first embodiment, the cross-sectional shape of the extruded opening 60 can be changed in order to control the outlet behavior of the extruded spinning dope 3.

The carriers 59a, 59b, 59c of the nozzle bodies 58a, 58b, 58c have a preferred thickness 63 of at least 600 μm. In another advantageous configuration of this embodiment, the thickness 63 is at least 800 μm, or at least 1000 μm, to obtain a particularly durable forming tool 51 that can withstand high pressures of up to 150 bar acting from the inlet 56. .. Here, the ratio of the thickness 63 of the carriers 59a, 59b, 59c to the diameter 62 of the extruded opening 60 is at least 6: 1 in order to obtain the required resistance. In the preferred configuration of the invention, this ratio is at least 10: 1, at least 12: 1, or at least 15: 1.

Very high dimensional accuracy in the positioning and dimensionality of the extruded openings 60 is obtained by applying laser energy to the carriers 59a, 59b, 59c to form the extruded openings 60 in them. As shown in FIG. 4, the extrusion openings 60 are arranged at a constant distance 64 of 50 to 1000 μm from each other and the standard deviation is 2% or less of the distance 64. In addition, by using laser radiation, the extruded openings 60 can be formed as essentially burr-free, eliminating the need for any additional grinding or polishing steps and thus the carrier 59a. , 59b, 59c help to avoid the formation of stress effects.

The forming tool 51 includes first webs 65a, 65b, 65c, 65d provided outside the forming tool 51. Inside the forming tool 51, there are provided second webs 66a, 66b extending in a rib shape between the first webs 65c and 65d and firmly connected to them by material bonding. In this case, each of the nozzle bodies 58a and 58c extends laterally between the first webs 65a, 65b and the second webs 66a, 66b with respect to its longitudinal extension 68. The nozzle body 58b extends between the second webs 66a, 66b. The webs 65a, 65b, 65c, 65d, 66a, 66b and the carriers 59a, 59b, 59c of the nozzle bodies 58a, 58b, 58c are firmly material-bonded to each other via the welded portion 73. Preferably, the webs 65a, 65b, 65c, 65d, 66a, 66b are configured as integral parts (eg, milling, deep drawing, rolled parts, etc.) from the nozzle bodies 58a, 58b, 58c towards the inlet side 56. Protruding.

The webs 65a, 65b, 66a, 66b extend parallel to each other and maintain a constant normal distance 67 (normal to the longitudinal extension 68) along the carriers 59a, 59b, 59c. In this case, the normal distance 67 is 100 times or less the thickness 63 of the carriers 59a, 59b, 59c, and as a result, the highest stability that the nozzle bodies 58a, 58b, 58c can take is obtained.

Inside the forming tool 51, the webs 65a, 65b, 65c, 65d, 66a, 66b act as guide surfaces 69 for the spinning dope 2. Therefore, the webs 65a, 65b, 65c, 65d, 66a, 66b form a guide passage 70 starting from the inlet side 56, through which the spinning dope 2 is guided to the extrusion opening 60.

Further, the forming tool 51 includes a flange 73, whereby the forming tool 51 can be connected to the spinning device 100 by force lock engagement. In this case, the four flange rims 71a, 71b, 71c, and 71d adjacent to the first webs 65a, 65b, 65c, and 65d, respectively, project outward from the forming tool 51 at the inlet side 56 and surround the forming tool 51. Form 73.

FIG. 5 shows a spinning apparatus 100 for extruding a spinning dope 2 into a cellulose molded body 4 by using a molding tool 1 according to the first embodiment of the present invention in a method for producing a regenerated cellulose molded body 4. In the method for producing such a regenerated cellulose molded body 4 in order to obtain the molded body 4, the extruded spinning dope 3 is extruded and then guided to the spinning bath 5 through the air gap 8 where the cellulose is obtained. Precipitates from the extruded spinning dope 3. According to another preferred configuration of the present invention, the method for producing the regenerated molded body 4 is a lyocell method in which the spinning dope 2 contains a solution of cellulose in a tertiary amine oxide. In this case, the spinning bath 5 for the precipitation of the extruded spinning dope 3 contains a mixture of water and a tertiary amine oxide (eg, NMMO-N-methylmorpholine-N-oxide).

Claims (15)

A molding tool (1, 51) for extruding a cellulose molded product (4) from a spinning dope (2), which is an inlet side (6, 56) and an outlet side (7,) for the spinning dope (2). 57), penetrates the carrier from the inlet side (6,56) to the outlet side (7,57), has a diameter (12,62) on the outlet side (7,57), and has a cellulose molded body (12,62). 4) At least one nozzle body (8, 58a, 58b) comprising the flat carrier (9, 59a, 59b, 59c) having an extrusion opening (10, 60) through which the spun dope (2) extruded into is passed. , 58c),
The ratio of the thickness (13, 63) of the carrier (9, 59a, 59b, 59c) to the diameter (12, 62) of the extrusion opening (10, 60) on the outlet side (7, 57) is at least 6: 1. It is preferably at least 10: 1 and is characterized in that the extrusion openings (10, 60) are formed in the carriers (9, 59a, 59b, 59c) by applying laser energy. A molding tool. The molding tool according to claim 1, wherein the carrier (9, 59a, 59b, 59c) has a thickness (13, 63) of at least 600 μm, preferably at least 800 μm. The molding tool according to claim 1 or 2, wherein the extrusion opening (10, 60) is free of burrs on the outlet side (7, 57). The molding tool according to any one of claims 1 to 3, wherein the nozzle body (8, 58a, 58b, 58c) is formed in an annular shape or a rectangular shape. The molding tool according to any one of claims 1 to 4, wherein the molding tool (51) includes a plurality of nozzle bodies (58a, 58b, 58c). The forming tool (1, 51) is firmly connected to the nozzle body (8, 58a, 58b, 58c) by material bonding, and is from the nozzle body (8, 58a, 58b, 58c) to the inlet side (6, 56). The molding tool according to any one of claims 1 to 5, wherein the molding tool comprises at least one first web (15, 65a, 65b, 65c, 65d) protruding toward the surface. The forming tool (1, 51) includes at least one second web (16, 66a, 66b), a first web (15, 65a, 65b) and a second web (16, 66a, 66b). The molding tool according to claim 6, further comprising a nozzle body (8, 58a, 58c) extending between the two. It is characterized in that at least a part of the web (15, 16, 65a, 65b, 65c, 65d, 66a, 66b) extends essentially perpendicular to the nozzle body (8, 58a, 58b, 58c). The molding tool according to claim 6 or 7. The method of the longitudinal extension (18, 68) of the nozzle body (8, 58a, 58b, 58c) between the first web (15, 65a, 65b) and the second web (16, 66a, 66b). The forming tool according to claim 7 or 8, wherein the line distance (17, 67) is at least 100 times the thickness of the carrier (9, 59a, 59b, 59c). 17. Molding tool. On the inlet side (6,56), the forming tool (1,51) includes a flange (23,73) having at least one flange rim (21,22,71a, 71b, 71c, 71d) and a flange rim. (21, 22, 71a, 71b, 71c, 71d) is characterized by being adjacent to the web (15, 16, 65a, 65b, 65c, 65d) and projecting outward from the forming tool (1, 51). The molding tool according to any one of claims 6 to 10. The extrusion opening (10, 60) is formed in the carrier (9, 59a, 59b, 59c) by applying laser energy to the inlet side (6, 56) of the molding tool (1, 51). 13. The method for manufacturing the molding tool (1, 51) according to the above item. 12. The method of claim 12, wherein the extruded openings (10, 60) are formed in the carriers (9, 59a, 59b, 59c) as a final procedural step. A method for producing a regenerated cellulose molded product (4), in which a cellulose-containing spinning dope (2) is extruded from a molding tool (1, 51) according to any one of claims 1 to 11 and a spinning bath is used. A method for producing a molded product (4) by precipitating in (5). 15. The method of claim 14, wherein the spinning dope (2) comprises a tertiary amine oxide in which cellulose is dissolved, and the spinning bath (5) comprises a mixture of water and a tertiary amine oxide.

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