Process for manufacturing high modulus, low shrinkage polyester monofilaments of very uniform diameters
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United States of America Patent
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May 19, 1998
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N/A
app pub date -
May 9, 1997
filing date -
May 9, 1997
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Expired
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Abstract
This invention discloses an improved process for manufacturing polyester monofilaments in the diameter range 0.1 mm to 0.3 mm with monofilament properties designed for use as the load-bearing, machine direction filaments in papermakers forming fabrics. The properties of the polyester monofilaments of this invention include a high tensile modulus, a low shrinkage, and control of monofilament diameters within .+-.3%. Process steps include the use of low viscosity polyester granules of Intrinsic Viscosity between 0.5 and 0.6, granules with crystalline skins and amorphous interiors, a low extrusion temperature, and spinneret orifices of cross-sectional area 30% larger than prior art. 1,000 kilograms of polyester monofilaments of uniform diameter may be produced using this improved process without changing the spinneret.
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