Process for the production of a multifilament texturized yarn

DETAILED DESCRIPTION The invention is hereby claimed as follows: 1.
A process for the production of a multifilament texturized yarn which comprises: simultaneously melt-spinning at least two different thermoplastic fiber-forming linear polymers selected from the group consisting of linear fiber-forming and crimpable polyesters and polyamides into a continuous preoriented multifilament tow containing the different polymer components under substantially the same spinning conditions for all portions as the tow including a draw-off from the spinning zone at a velocity of more than 2,500 meters/minute; and then, in a second separate stage prior to any crimping, stretching the spun and solidified multifilament tow under substantially the same stretching conditions for all portions of the tow, said melt-spinning being carried out to achieve a preorientation which is so high that the available maximum stretching ratio of all the filamentary polymer components in the second stage amounts to not more than 1:2.
5, and said stretching being carried out to exceed the elastic limit of at least one of the filamentary polymer components with the proviso that said stretching is maintained above the elastic limit but below the maximum stretching ratio of at least one of the filamentary polymer components while said stretching also extends beyond the maximum stretching ratio of at least another one of the filamentary polymer components to cause filament breakage.
2.
A process as claimed in claim 1 wherein the initially melt-spun thermoplastic filaments are drawn off at a velocity of between about 2,700 and 5,000 meters/minute from the spinning zone.
3.
A process as claimed in claim 1 wherein the initially melt-spun filaments are subjected to a quenching treatment as they are drawn off from the spinning zone.
4.
A process as claimed in claim 1 wherein the initially melt-spun filaments are subjected to a quenching treatment as they are drawn off from the spinning zone.
5.
A process as claimed in claim 1 wherein the initially melt-spun filaments are subjected to a quenching treatment as they are drawn off from the spinning zone