Method for controlling homogeneity of fluorescent-whitened polyester staple fiber product

Abstract

The invention relates to a method for controlling homogeneity of a fluorescent-whitened polyester staple fiber product, which comprises the following process procedures of fusing and extruding a PBT (polybutylece terephthalate) fluorescent-whitening master batch by a screw extruder, quantitatively adding the extrudate to a PET (Positron Emission Tomography) fusant of a normal PET production and delivery pipeline through a first metering pump and a master batch fusant pipeline, pressurizing the extrudate through a booster pump to lead the extrudate to enter a fusant cooler to be cooled to normal spinning temperature, then leading the cooled extrudate to enter the fusant pipeline, mixing the extrudate through a static mixer to make the extrudate into a blending fusant of the PBT fluorescent-whitening master batch and PET, leading the blending fusant to enter a spinning box, metering the blending fusant by a second metering pump, leading the blending fusant to enter a spinning component for spinning, cooling and oiling spun silks, and dragging the spun silks by a dragging roller and a sunflower wheel to be sent into a silk holding barrel. The rotation speed of the booster pump and the first metering pump adopts signal interlock control; the master batch fusant pipeline and the first metering pump are respectively provided with a heat tracing temperature control system; and heat tracing media of the heat tracing temperature control systems adopt the primary heating medium series control of a heat tracing temperature control system of a normal PET fusant pipeline. By the control method, the addition proportion of a fluorescent whitening ingredient can be ensured to be a set value when production capacity is changed.

Description

technical field [0001] The invention relates to a method for controlling the uniformity of fluorescent whitening polyester staple fiber products. It belongs to the field of chemical fiber technology. Background technique [0002] Fluorescent whitening polyester staple fiber is common polyester staple fiber in the production process, adding fluorescent whitening ingredients to endow polyester staple fiber with lasting fluorescent function. Products are widely used in reflective materials, textile and garment fields. Because the amount of fluorescent whitening ingredients directly affects product appearance and product performance, fluorescent whitening polyester staple fibers have higher requirements for product uniformity. [0003] At present, general manufacturers produce fluorescent whitening polyester staple fibers, mainly using the screw to directly melt the fluorescent whitening masterbatch, extruding it into the melt pipeline, or adding a metering pump to achieve qua...

AI Technical Summary

Problems solved by technology

However, in the actual production process, due to the need for regular or irregular repairing operations for spinning (after the spinneret has been used for a period of time, the spinneret stripping effect will be affected due to the sublimation of polyester oligomers and aging silicone oil on the surface of the spinneret. Resulting in pre-spinning raw silk with pulp, broken filaments, etc., which are easy to form defective products) and maintenance operations, etc., resulting in changes in melt pressure and production capacity during production

However, direct screw extrusion is affected by external pressure changes, and the amount of extrusion changes indefinitely. Since the quantitative addition of the metering pump cannot be adjusted synchronously with the change in output, the final addition ratio will also change, resulting in uneven distribution of fluorescent whitening components in the final product. , leading to deviations and unevenness in the appearance of whiteness and physical properties of the product

poor product uniformity

[0004] In addition, general manufacturers of fluorescent whitening masterbatch use PET (polyethylene terephthalate) as the base material and add it to the normal PET melt, but PET itself is a polymer compound with large molecular weight, long molecular chain, and good dispersibility. Poor, and because of the remelting of slices, temperature control and viscosity changes will affect the rheological properties of the melt and affect the dispersion of the active ingredients of fluorescent whitening

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