Process for manufacturing high modulus, low shrinkage polyester

Details Process for manufacturing high modulus, low shrinkage polyester Process for manufacturing high modulus, low shrinkage polyester

1997-05-09

1998-05-19

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642105, 2642108, 26421112, 26421114, 26421117, 2642356, 264342RE, D01D 102, D01D 516

Patent

active

057531684

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.

REFERENCES:
patent: 4060516 (1977-11-01), Kuratsuji et al.

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