Extrusion methods and equipment
A technology for extrusion equipment and equipment, which is applied in the field of extrusion for forming polymer solutions or polymer fluids, and can solve problems such as damage to devices, contamination of independently spinning fibers, and harm to product quality.
Active Publication Date: 2017-02-15
AUROTECH GMBH
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- Description
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- Application Information
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Problems solved by technology
[0015] According to the present invention it has been found that extrusion and subsequent cooling can cause undesirable particle formation and deposits on the extruder or contamination of the individually spun fibers
For example, immediately after extrusion and cooling, individual components of the material to be formed may thus detach in the form of solid particles from the still fluid spun fibers and may damage the device or endanger the quality of the product
Method used
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Embodiment
[0044] According to this example, using as figure 1 Extrusion equipment shown in. In this form, the extrusion device comprises an extrusion plate 6 bent in the direction of the gas flow, the contour at the extrusion orifice 1 replicating the surface of the water bath which acts as a collecting bath when the material fluid flows into it contour. As a result of extrusion under pressure, the material fluid is formed eg into filaments by the shape of the extrusion orifice and drawn further by passing through the gas flow. Due to cooling, the viscosity is reduced to avoid sticking when entering the water bath.
[0045] The lateral blower gas flow is achieved by heating the upper part of the blower as well as the extrusion plate as a hot zone and a cold zone. The laminar flow in the material flow area is maintained by deflecting the gas by means of baffles as flow guiding elements.
[0046] During operation, when using cellulose-NMMO-water solution to spin cellulose filaments, ...
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Abstract
The present invention relates to a method of producing filaments or films of solid material from a fluid of material by extruding the fluid through one or more extrusion orifices and allowing the material to solidify in a precipitation bath. The formed material is guided between the extrusion orifice and the precipitation bath by lateral gas flow. The invention is characterized in that the gas stream is divided into a hot and a cold split. The material is contacted first with the hot stream and then with the cold stream before being introduced into the precipitation bath. The invention also relates to equipment for extruding and forming materials.
Description
technical field [0001] The present invention relates to extrusion methods, in particular extrusion methods for shaping polymer solutions or polymer fluids. Background technique [0002] Cellulose and other polymers can be dissolved in suitable solvents and converted by controlled coagulation into desired shaped articles. Reference is also made to spinning processes if the shaped articles are fibers, filaments, etc. Cellulose is for example dissolved in an aqueous solution of amine oxides, in particular N-methylmorpholine N-oxide (NMMO), to prepare spinning products such as filaments, staple fibers, films from the spinning solution obtained Wait. This is done by precipitating the extrudate in water or a dilute amine oxide solution once the extrudate from the extrusion die is directed via the air gap into the precipitation bath. [0003] US4416698 relates to extrusion or spinning of cellulose solutions to form cellulose into fibers. In this case, the fluid spinning materia...
Claims
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IPC IPC(8): D01D5/088D01F2/00C08J5/18D01D10/02B29C48/05B29C48/08B29C48/345
CPCD01D5/088D01F2/00B29C48/05B29C48/08B29C48/345B29C48/917B29C48/918B29C48/3003D01D10/02D01D5/06D10B2201/22
Inventor S·济凯利F·埃克
Owner AUROTECH GMBH