溶解
天然或合成技术纤维的生产需经过一系列步骤，将原料转化为粘稠、均匀且脱气的纺丝溶液。
对于需要溶解步骤的纤维，LIST 捏合反应器技术可生产出高质量的纺丝溶液，从而在最大产量和最低成本下实现优异纤维品质。
捏合反应器独特的工艺特性确保了强烈混合与捏合、持续的表面更新以及可灵活调节的停留时间。LIST 技术的众多优势之一，便是可在单条生产线上实现大规模工业产能的放大。
特性
示例
莱赛尔纤维
在LIST捏合反应器中，纤维素、添加剂和溶剂被连续溶解。捏合机确保均匀的热处理、蒸发和脱气，以及强烈的混合。结果是得到一种清澈透明、淡黄色的纺丝溶液，该溶液高度均匀，无气泡和溶解气体。根据工艺不同，溶剂可以是N-甲基吗啉-N-氧化物（NMMNO）、各种离子液体以及各种酸和碱。
芳纶
芳纶纤维通常通过湿法纺丝从聚对苯二甲酰对苯二胺（PPTA）聚合物在浓硫酸中的粘稠溶液制成。放热溶解过程中释放的热能有助于熔化和溶解聚合物。聚合物溶液具有粘性和非牛顿特性。要求是制备出具有可控高聚合物浓度的均匀、脱气溶液。
下载
In conventional spinning dope production, capacity is typically a function of the maximum processing viscosity the spinning plant can handle. Often the prior dissolving process step is limited by this fact. In a typical wet spinning operation, dope viscosity ranges from 500-2500 Pa ·s (zero shear viscosity at 95 °C) can be handled. For processors looking to meet rising demand with world-sca le plants, the limitations imposed by high viscosity dope sol utions are challenging and costly. List AG, Arisdorf/Switzerland, have now adapted the company’s high viscosity processing technology in order to meet the difficult processing challenges of today’s high-production fiber lines. The technology can easily handle 20,000-200,000 Pa·s (zero shear viscosity).
Language: English / Year: 2013
A new dissolution process for cellulose spinning solution was developed. As Basis for the new process served the classic cellulosic fiber production process. In the last 30 years or so the conventional viscose process became environmentally critical. Evaluated with regard to its environmental viability it was found to create considerable water and air pollution. This conclusion ignited the research and development of new technologies with less environmental impact.
Language: English / Year: 1999
Der zunehmende Kostendruck macht keinen Halt vor der Produktion von Elastomeren. Gefragt sind intensivierte Prozesse, die unnötige Verfahrensschritte ersparen und sowohl Zeitaufwand wie auch Kosten senken. Nun liefert ein innovativer Ansatz aus der Schweiz, die sogenannte Direct Devolatilization (direkte Entgasung) von Polymerlösungen, vielversprechende Ergebnisse.
Language: German / Year: 2015
The Lyocell fiber process is developed to transform cellulose to a man-made cotton-like fiber. The lyocell process includes a number of processing steps. The dissolving step is the most important one. It represents the heart of the lyocell technology. Kneaders developed by List AG, Arisdorf/Switzerland, are successfully applied for the continuous dissolving step whereby raw materials of different origin can be processed and transferred into a spinabie dope.
Language: English / Year: 2006
Der LYOCELL-Prozess ist eine moderne umweltfreundliche Möglichkeit zur Umwandlung von verschiedensten cellulosischen Rohmaterialien der Natur in Fasern, Filamente und Folien zur weiteren Verarbeitung in der Textilindustrie, der Verpackungsindustrie oder als Strukturbildner in technischen Anwendungen. Die Nassreißfestigkeit der LYOCELL-Faser übertrifft sogar die der Bauwollfaser.
Language: German / Year: 2004
LIST further optimized the cellulose dissolution technology, which was introduced in 1992. This succeeded the production of excellent spinning solution qualities, produced from a variety of low cost raw materials. The technology fulfils the current high safety standards.
Language: English / Year: 2001
For decades, conventional polymerisation has been the norm in the production of elastomers. The time and cost involved in removing and treating solvents in the final stages of production were acceptable. Yet as pressure builds on manufacturers to reduce operating costs, there is greater urgency to develop processes that can help streamline costs and production techniques. One such effort has yielded extremely promising results.
Language: English / Year: 2015
Fiber, filament, flies and foil are the final products of a complex process of mixing, dissolving, spinning, washing and drying of raw material. Many specialists believe that the spinning part is the only relevant processing step for the final fiber quality. This belief falls short, as the fiber quality also depends on the dissolving step before the spinning step.
Language: English / Year: 2014
As world consumption of textile fibers expands with the rapid growth of Asia and other developing countries, sources of fibers other than cotton and rayon must be developed and brought to market to meet demand. Cellulose fibers (Lyocell fibers) can meet these expanding needs because of the specific qualities and characteristics of the fiber, as well as the vast availability of the raw materials.
Language: English / Year: 2004
