Process for determining the acidity of a washing solution for fibers
AssigneeTeijin Twaron GmbH
InventorsWillem G. Haanstra, Hendrikus J. M. Busschers
Life of this patent
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Abstract
The invention pertains to a process for determining the acidity of a washing solution for removing adhering acid or base from a fibre. The determination is carried out by using a combination of at least two different analytical methods, at least one of which is selected from the density, conductivity, ultrasonic sound, and refractive index measurements. The determination makes it possible to adjust the acidity of the washing solution in such a way that fibres with a minimum amount of adhering acid or base can be produced.
Claims9
A process for producing fibers having a minimum amount of adhering acid or base comprising:
- extruding a fiber-forming polymer through the orifices of a spinneret to form a fiber, preparing a washing solution, including
- determining an acidity of the washing solution by carrying out a combination of at least two different analytical methods, at least one of which is selected from the group consisting of density measurements, conductivity measurements, ultrasonic sound measurements, and refractive index measurements, and
- correcting the acidity of the washing solution to a necessary acidity value following the determining step if the acidity determined is different from the necessary acidity value, thereby deriving the washing solution having the acidity value necessary for yielding the fiber having a minimum amount of adhering acid or base following washing of the fiber with the washing solution, and
- washing the fiber with the washing solution to remove adhering acid or base from the fiber.
Dependencies are inferred from the claim text.