Draw texturing and entanglement apparatus for yarn

Claim 3

The apparatus of claim 1 wherein the first cross-section if polygonal, such that one side of the polygon is formed by said means for enclosing said at least two different cross-section portions of said yarn path part block.

Claim 4

The apparatus of claim 2 wherein the second cross-section is circular and forms a spherical section.

Claim 5

The apparatus of claim 2 wherein the polygonal cross-section is a triangle having one side thereof formed by said means for enclosing said at least two different cross-section portions of said yarn path part block.

Claim 6

The apparatus of claim 4 wherein the triangular cross-section has one corner thereof generally aligned with said at least one fluid jet opening.

Claim 7

The apparatus of claim 4 wherein the second cross-section is circular and forms a spherical section.

Claim 8

The apparatus of claim 6 wherein the ratio of the diameter of the circular second cross-section to the length of the largest side of the triangle of the first cross-section is between 1.25 and 2.1, and wherein no side of the triangle has a length more than 50% longer than any other side.

Claim 9

An apparatus according to claim 6 wherein the at least one fluid jet opening in said yarn treating section is disposed and oriented to cause the yarn passing through the yarn path part block to be subjected to a swirling and disturbing action along the walls of the spherical section while simultaneously utilizing the wall planes of the triangular channel of the yarn path part block to promote entanglement by frictional force.

Claim 10

The apparatus of claim 2 wherein the polygonal cross-section is a trapezoid having one side thereof formed by the means for enclosing said at least two different cross-section portions of said yarn path part block.

Claim 11

The apparatus of claim 9 wherein the second cross-section is circular and forms a spherical section.

Claim 12

The apparatus of claim 2 wherein the polygonal cross-section is substantially pentagonal in shape; said pentagon having one side thereof formed by the means for enclosing said at least two different cross-section portions of said yarn path part block.

Claim 13

The apparatus of claim 11 wherein the second cross-section is circular and forms a spherical section.

Claim 14

The apparatus of claim 1 wherein the second cross-section is circular and forms a spherical section.

Claim 15

The apparatus of claim 1 wherein the means for enclosing the at least two different cross-section portions of said yarn path is a separate member removably fastened to said yarn path part block.

Claim 16

The apparatus of claim 1 wherein the at least one planar wall is parallel to the yarn travel direction.

Claim 17

A draw texturing apparatus for producing a yarn having alternating entangled portions and open portions comprising: (a) a draw texturing means for draw texturing multifilament yarn, having feed rollers at the output thereof; (b) an air entanglement device comprising: (1) a yarn path part block having a channel formed in a surface thereof so as to have at least two different cross-section portions; including, (1) one portion, in the form of a yarn path channel, having a first cross-sectional area which is defined by at least one planar wall arranged longitudinally in the yarn travelling direction, and (2) another portion, forming a yarn treating section, formed continuous with and intermediate along the yarn path channel, such portion, defined by a curved surface forming a second cross-section having a larger cross-sectional area than the first cross-section, with at least one fluid jet opening in the vicinity of the bottom of said curved surface; (c) means for enclosing said at least two different cross-section portions of said yarn path part block to form therewith a tunnel-like structure, said fluid jet opening lying in the plane defined by the longitudinal surface of said yarn path channel which is furthest from said means for enclosing said cross-section portions; and (d) means for supplying a fluid to said at least one fluid jet opening; said device receiving said multifilament yarn from said feed rollers; wherein at least one edge of said planar wall of said yarn path channel is tangent to the imaginery arc of the curved surface of said yarn treating section.

Claim 18

A draw texturing apparatus for producing a yarn having alternating entangled portions and open portions comprising: (a) a draw texturing means for draw texturing multifilament yarn, having feed rollers at the output thereof; (b) an air entanglement device comprising: (1) a yarn path part block having a channel formed in a surface thereof so as to have at least two different cross-section portions; including, (1) one portion, in the form of a yarn path channel, having a first cross-sectional area which is defined by at least one planar wall arranged longitudinally in the yarn travelling direction, and (2) another portion, forming a yarn treating section, formed continuous with and intermediate along the yarn path channel, such portion, defined by a curved surface forming a second cross-section having a larger cross-sectional area than the first cross-section, with at least one fluid jet opening in the vicinity of the bottom of said curved surface; (c) means for enclosing said at least two different cross-section portions of said yarn path part block to form therewith a tunnel-like structure, said fluid jet opening lying in the plane defined by the longitudinal surface of said yarn path channel which is furthest from said means for enclosing said cross-section portions; and (d) means for supplying a fluid to said at least one fluid jet opening; said device receiving said multifilament yarn from said feed rollers; wherein at least one edge of said planar wall of said yarn path channel is tangent to the imaginery arc of the curved surface of said yarn treating section.

Claim 19

The apparatus of claim 16 further comprising a second pair of feed rollers at the input thereof, wherein an overfeed coefficient of the input feed rollers with respect to the output feed rollers is at least 2%.

Claim 22

An apparatus as in claim 18 wherein said first surface is planar.

Claim 23

An apparatus as in claim 18 wherein said second curved surface is spherical.

Claim 24

An apparatus as in claim 18 wherein said yarn channel has a cross section which is polygonal.

Claim 25

An apparatus as in claim 21 wherein said yarn channel has a cross section which is triangular and wherein said second curved surface is spherical and wherein the ratio of the diameter of said spherical surface to the length of the largest side of said triangular cross section is between 1.25 and 2.1 and wherein no side of said triangular cross section has a length more than 50% longer than any other side.

Claim 26

An apparatus as in claim 21 wherein at least one of said edges of said yarn passage walls is tangent to the imaginary arc created by the intersection of the curve defined by said second surface.

Claim 27

A draw texturing apparatus for producing a yarn having alternating entangled portions and open portions comprising: a draw texturing means for draw texturing multifilament yarn having feed rollers at the output thereof; an air entanglement device, said air entanglement device comprising: a first surface, a second curved surface in communication with said first surface, said first and second surfaces together forming a yarn treatment enclosure, a fluid jet in communication with said yarn treatment enclosure at a first communication location, said first communication location being coincident with the point on said second surface which is furthest from said first surface, a yarn channel longitudinally disposed on opposite sides of said yarn treatment enclosure and communicating with said yarn treatment enclosure, said yarn channel comprising a plurality of walls, said walls being in abutment along their edges and defining at least one longitudinal surface spaced from said first surface, said first communication location lying in the plane defined by the longitudinal surface of the said yarn channel which is furthest from said first surface, said yarn channel having a cross sectional area which is less than that of said yarn treatment enclosure, said air entanglement device receiving said multifilament yarn from said feed rollers.

Claim 28

A draw texturing apparatus for producing a yarn having alternating entangled portions and open portions comprising: a draw texturing means for draw texturing multifilament yarn having feed rollers at the output thereof; an air entanglement device, said air entanglement device comprising: a first surface, a second curved surface in communication with said first surface, said first and second surfaces together forming a yarn treatment enclosure, a fluid jet in communication with said yarn treatment enclosure at a first communication location, said first communication location being coincident with the point on said second surface which is furthest from said first surface, a yarn channel longitudinally disposed on opposite sides of said yarn treatment enclosure and communicating with said yarn treatment enclosure, said yarn channel comprising a plurality of walls, said walls being in abutment along their edges and defining at least one longitudinal surface spaced from said first surface, said first communication location lying in the plane defined by the longitudinal surface of the said yarn channel which is furthest from said first surface, said yarn channel having a cross sectional area which is less than that of said yarn treatment enclosure, said air entanglement device receiving said multifilament yarn from said feed rollers.