Process for making a monofilament-like product
View Patent ↗The invention relates to a process for making a monofilament-like product from a precursor containing a multitude of continuous polyolefin filaments, comprising exposing the precursor to a temperature within the melting point range of the polyolefin for a time sufficient to at least partly fuse adjacent fibers and simultaneously stretching the precursor at a draw ratio of at least 2.8. With the process according to the invention a monofilament-like product can be made that shows improved tensile properties; making it very suitable for application as e.g. fishing line.
1. A process for making a monofilament-like product comprising the steps of:
(a) providing a precursor consisting of a multitude of twisted or air-entangled continuous filaments, wherein the precursor contains predominantly continuous polyolefin filaments, and
(b) exposing the precursor to a temperature within the melting point range of the polyolefin for a time sufficient to at least partly fuse adjacent fibres while simultaneously stretching the precursor at a draw ratio of at least 2.7.
2. The process according to claim 1 , wherein the draw ratio is from 2.8 to 10.
3. The process according to claim 1 , wherein the polyolefin is an ultra-high molar mass polyethylene.
4. The process according to claim 3 , wherein the polyolefin is a linear polyethylene that contains less than 1 mol % of comonomers.
5. The process according to claim 3 , wherein the polyethylene has an intrinsic viscosity, as determined on solutions in decalin at 135° C., in the range 5-25 dl/g.