MXPA97008639A

MXPA97008639A - Filament that has a transversaltriangular section and 3 or 6 empty spaces that sextide axialme

Info

Publication number: MXPA97008639A
Application number: MXPA/A/1997/008639A
Authority: MX
Inventors: Hancheng Lin Perry; Vaughn Samuelson Harry
Original assignee: E I Du Pont De Nemours And Company
Priority date: 1995-05-11
Filing date: 1997-11-10
Publication date: 1998-02-01

Abstract

The present invention relates to a textile filament, characterized in that it comprises a thermoplastic synthetic polymer having a generally triangular cross section and three convex sides of approximately equal length, a solid axial core, three axially extending, non-circular voids, or three pairs of empty spaces, not circular, where each non-circular space or each pair of non-circular empty spaces is substantially separated at the same distance from the other non-circular empty space or from each of the other pairs of non-circular empty spaces, three empty spaces or three pairs of empty spaces are located along each convex side of the filament, and a content of empty spaces of 8 to 3

Description

FILAMENT THAT HAS A TRIANGULAR TRANSVERSAL SECTION AND 3 OR 6 EMPTY SPACES THAT EXTEND AXIALLY FIELD OF THE INVENTION This invention relates to a triangular filament having three convex sides and axially extending voids, useful as a carpet thread, which has good performance against wear, good volume and coverage, luster, good gloss, and good hiding properties. the stains and repellent against dirt. The invention is also a nozzle plate for spinning, to produce the triangular filaments.

BACKGROUND OF THE INVENTION Champaneria et al. In US Pat. No. 3,745,061 discloses synthetic filaments having 3 or 4 empty non-circular spaces extending axially (in cross-section). The version of 3 empty spaces described is almost circular in its cross section. Payne and co-workers in US Patent No. 4,279,053 describe the bristles REF: 25674 triangular paint brushes that have three empty non-circular spaces that extend axially. The empty spaces are in the vertex of the angles.

BRIEF DESCRIPTION OF THE INVENTION The present invention is a textile filament comprising a synthetic thermoplastic polymer having a generally triangular cross section and three convex sides of approximately equal length, a solid axial core, three axially extending, noncircular, empty spaces, or three pairs of empty non-circular spaces that extend axially, where each empty non-circular space or each pair of empty non-circular spaces is substantially spaced at the same distance from another non-circular void space or each of the other pairs of empty non-circular spaces, three empty spaces or three pairs of empty spaces are located along each convex side of the filament, and an empty content of 8 to 35 percent. The present invention is also a nozzle plate for spinning for the preparation of the filaments just described, said nozzle plate for spinning has at least one group of openings forming a filament; the group has (a) a central "Y" shaped opening whose layers are approximately equal in length and whose legs are joined at a point of attachment and at an angle of approximately 120 degrees, and (b) 3 peripheral slot openings, each of which is located between the legs of the central "Y" shaped opening, each of the peripheral slot openings has two ends, the two ends of each of the openings of each of the 3 openings of peripheral groove are adjacent to two of the ends of the central opening in the shape of "Y" that are not joined. In one embodiment of the nozzle plate for spinning, the three peripheral slot openings each have a central leg extending towards the junction point of the legs of the central "Y" shaped opening.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 depicts an enlarged front view of a group of filament-forming openings in a spinneret plate suitable for spinning in molten form filaments containing three empty spaces extending axially, separated at a distance, substantially equidimensional. Figure 2 is an enlarged drawing of a typical filament of three empty spaces of the invention, made by using the spinneret of figure 1. Figure 3 describes an enlarged front view of a group of openings forming a filament in a nozzle plate for spinning, suitable for spinning in melt form filaments containing three pairs of empty spaces extending axially, substantially equidimensional spaced at the same distance. Figure 4 is an enlarged drawing of a typical filament of three pairs of empty spaces of the invention, made by using the spinneret of Figure 3.

DETAILED DESCRIPTION The filaments of this invention can be prepared from synthetic, linear and thermoplastic polymers, which are spun in molten form. Among the most important polymers are polyamides, polyesters and polyolefins. The molten polymer is spun through the holes of the nozzle for spinning, under the spinning conditions which give the desired denier and the percent of empty space. The specific spinning conditions and the dimensions of the spinning nozzle will vary depending on the particular polymer and filament product being spun. The percent of empty space is partly dependent on the conditions of spinning and rapid cooling. Normally, the percent empty space can be increased by faster cooling of the molten filaments, and by increasing the viscosity of the molten polymer. Applications for which the filaments of this invention are highly useful, typically require a denier per filament within the range of about 3 to about 25. With reference to Figure 1, the dimensions of the openings of the spinning nozzle are as follows : A = 0.762 mm (0.030 inches), B = 1.346 mm (0.053 inches), C = 0.071 mm (0.0028 inches), D = 0.284 mm (0.0112 inches), E = 0.081 mm (0.0032 inches), F '= 60 degrees; and G = 0.203 mm (0.008 inches). With reference to Figure 2, the dimensions of the nozzle openings for spinning are as follows: A '= 0.584 mm (0.023 inches), B' - 0.381 mm (0.015 inches), C = 1.397 (0.055 inches), D '= 0.284 mm (0.0112 inches), E '= 0.081 mm (0.0032 inches), F' = 80 degrees, G '= 60 degrees, and H' = 0.091 mm (0.0036 inches). The spinning nozzles of Figures 1 and 2 are 0.381 mm (0.015 inches) thick.

Example 1 Using a nozzle plate for spinning having groups of filament-forming openings, as shown in Figure 1, the nylon 66 polymer was spun at a throughput of 50 kg / hr / position. The filaments were cooled rapidly with air in transverse flow. The filaments had a cross sectional configuration approximately equal to that shown in Figure 2. The filaments had an empty space content of approximately 15%. Fifty filaments were combined to form a 1000 dtex yarn. The yarn had a relative viscosity of 74. The yarns were grouped at 225 degrees Celsius and had a percentage volume of 32. The yarn was formed on a plain yarn or corduroy style mat, and the mat was tested for wear performance , the repellence / concealment of stains and cleaning capacity, luster, volume / coverage and aesthetics. The mat passed all the tests satisfactorily. The mat was cleaned better than a similar mat made of threads in which the fibers were of solid three-lobed cross section.

Example 2 Using a spinning nozzle plate having groups of filament-forming openings, as shown in Figure 3, nylon 66 polymer containing 0.30% titanium dioxide was spun at a yield of 50 kg / hr / position. The filaments were cooled rapidly with an air in transverse flow. The filaments had a transverse configuration approximately equal to that shown in Figure 4. The filaments had an empty space content of approximately 12%. Fifty filaments were combined to form a 1000 dtex yarn. The yarn had a relative viscosity of 74. The yarns were grouped at 225 degrees Celsius and had a percentage volume of 32. The yarn was formed on a plain yarn or corduroy style mat, and the mat was tested for performance to wear, repellency / concealment of stains and cleaning ability, luster, volume / coverage, and aesthetics. The mat passed all the tests satisfactorily. The mat was cleaned better than a similar mat made of yarn in which the fibers were of solid three-lobed cross section.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates.

Having described the invention as above, property is claimed as contained in the following:

Claims

1. A textile filament, characterized in that it comprises a thermoplastic synthetic polymer having a generally triangular cross section and three convex sides of approximately equal length, a solid axial core, three empty spaces that extend axially, not circular, or three pairs of empty spaces , not circular, where each empty non-circular space or each pair of empty non-circular spaces is substantially separated at the same distance from the other non-circular empty space or from each of the other pairs of empty non-circular spaces, the three empty spaces or three pairs of empty spaces are located along each convex side of the filament, and a content of empty spaces of 8 to 35%.

2. The filament according to claim 1, characterized in that there are three empty non-circular spaces in the filament.

3. The filament according to claim 1, characterized in that there are three pairs of empty non-circular spaces in the filament.

4. A spinning nozzle plate, characterized in that it has at least one group of filament-forming openings, said group has (a) a central "Y" shaped opening whose legs are of approximately equal length, and whose legs are joined together in a point of attachment and at an angle of approximately 120 degrees, and (b) 3 peripheral slot openings, each of which is located between the legs of the central "Y" shaped opening, each of the peripheral slot openings it has two ends, the two ends of each of the three peripheral slot openings are adjacent two of the ends of the central "Y" shaped opening to which they are attached.

5. The nozzle plate for spinning according to claim 4, characterized in that the three peripheral groove openings each have a central leg extending towards the point of attachment of the legs of the central "Y" shaped opening.