Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1986-05-19
1987-06-23
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
5283081, 5283082, 5283083, 528480, C08G 6302
Patent
active
046753788
ABSTRACT:
An apparatus and process for the continuous manufacture of high stress, high denier industrial yarn spun from polyethylene terephthalate polyester. A control system continuously measures melt viscosity of the polymer both at the outlet from a polymerization zone and at a downstream location adjacent a manifold immediately preceding a plurality of spinnerettes through which the polymer is drawn into filamentary material. Adjustments are continuously made to a meaningful operating condition within the polymerization zone, such as the magnitude of the vacuum therein, whenever IV inferred from operating data strays from a pre-established level. Adjustments are also regularly made at discrete short term intervals, for example, minute by minute, whenever viscosity at the outlet from the polymerization zone strays from the pre-established level. Additionally, adjustments are made to that pre-established level of viscosity whenever viscosity at the downstream location varies substantially from the norm after a moderate lapse in time, which may vary, for example, between one-half hour and eight hours in duration.
REFERENCES:
patent: 4072663 (1978-02-01), Pendlebury
patent: 4237261 (1980-12-01), Kawamura et al.
patent: 4362852 (1982-12-01), Pendlebury et al.
Adkins, Jr. Virgil J.
Gibbon John D.
Celanese Corporation
Phynes Lucille M.
Stine Forrest D.
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