JPS5853088B2 - Manufacturing method of special crimped yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a special crimped yarn having a slub-like tone effect.

An object of the present invention is to provide, by a simple method, a special crimped yarn with low elasticity that exhibits a slab effect and a clear shading effect by dyeing.

Conventionally, thermoplastic filament yarns having alternately high and low molecular orientation areas along the length of the yarn and regular filaments are intertwisted and then subjected to false twist crimp processing. It is known that a highly elastic textured yarn in which both yarns are crimped while maintaining an intertwisted state can be obtained by this method.

(For example, Japanese Patent Publication No. 44-32631) Although there are slight changes in dyeability and thickness unevenness in this processed yarn, since both are in a twisted state, color differences and thickness unevenness are observed. There are aspects that are difficult to emphasize.

On the other hand, from a processing perspective, the twisting speed (
(twisting) speed is much lower and economic disadvantage is unavoidable.

As a result of various studies in order to obtain special crimped yarns that have a more slab-like appearance and a clear color difference at a lower cost, the present inventors have developed thermoplastic long fiber yarns with a high degree of molecular orientation and thermoplastic long fiber yarns with a low degree of molecular orientation. By combining the processing principle that when fiber yarns are aligned and subjected to false twisting, a special structured yarn is obtained in which yarns with a high degree of molecular orientation are wound around yarns with a low degree of molecular orientation, and a special yarn use is used. By doing this, we were able to provide the desired crimped yarn.

Thus, according to the present invention, the thermoplastic filament yarn C has a uniform degree of molecular orientation, and has a uniform degree of molecular orientation, and a thermoplastic long fiber yarn C in which portions A with a high degree of molecular orientation and portions B with a low degree of molecular orientation exist alternately along the length direction of the yarn. By aligning thermoplastic long fiber yarns having a degree substantially the same as that of the A portion of the C yarn and guiding them to a false twisting device, the B portion of the C yarn is wrapped around the D yarn in the false twisting section. A method for manufacturing a special crimped yarn is provided, which is characterized in that the A portion of the C yarn and the D yarn are mixed with each other.

To explain the present invention with reference to the accompanying drawings, in Fig. 1, C is a thermoplastic long fiber yarn in which portions with a high degree of molecular orientation and portions B with a low degree of molecular orientation exist alternately along the length of the yarn, and D is a uniform fiber yarn. The degree of molecular orientation is substantially the same as that of A.

When these two yarns are aligned and subjected to false twisting, as shown in Figure 2, the part B of the C yarn is wrapped around the yarn, and the part A of the D yarn and C yarn is twisted. A special crimped yarn is obtained in which portions are uniformly distributed along the length of the yarn.

If C yarn and D yarn are the same polymer, yarn C
Since the B part has a lower degree of orientation than other part numbers, it is dyed darkly when dyed, and has a structure where it is wrapped around the outside of the thread, that is, a structure in which the B part gathers in a plane, so it is difficult to dye other parts. It looks extremely dog-like due to the difference in shading.

In addition, the wrapped portion has two shapes, 1, 1, 1, and 1 square, compared to other portions, so it produces a slab-like effect.

Here, we will briefly touch on the mechanism by which the wrapped portion and mixed portion are formed.

1 Formation of the rolled part , general.

When filament yarns with different degrees of molecular orientation, that is, yarns with different elongation forces, are aligned and fed to the false-twisting heating area, the elongation stress between the yarns will be different for the same heating tension. However, in reality, in an attempt to balance the heating stress between the yarns, the yarns with a lower degree of molecular orientation are wrapped around yarns with a higher degree of molecular orientation and are elongated.

When this is untwisted, as shown in FIG. 2, the wound yarn (excessively stretched) takes on a core-sheath structure with a partial sag.

11 Formation of a mixed part There is no substantial difference in the degree of orientation of the filaments between the yarns (that is, there is no difference in the elongation 17ε and the force difference).As mentioned in 1), the winding structure is maintained. In the drawn state, a single filament yarn is twisted in the direction of -■2 (j'), and similarly to L, -, ·, ita1/jyon occurs between the filaments, and both The result is a crimped portion with a mixture of threads.

It should be noted that the thread C and the thread are dyeable and are different from each other.
It is 4'7. 71-1
The effect of the invention will be even greater.

In the method of the present invention, the most important thing is to literally guide the threads ``1 forward'' when guiding the threads C and ① to the preliminary combustion chamber.

After aligning and twisting both yarns, a slab is created by aligning the yarns, twisting them, and applying pressure to create a slab.
This is because ζ is not formed and it is not possible to achieve the object of the present invention.

In addition, when combining the yarns, it is necessary that the degree of molecular orientation of the A part of the C yarn and the yarn is substantially the same. It contrasts with the wrapped portion in terms of thickness and dyeability.

FIG. 3 shows an example of the process of carrying out the present invention, in which undrawn yarn 1 is placed on a rotating plate 5 between a supply roll 3 and a drawing roll 4 rotating at a faster circumferential speed. When the undrawn yarn 1 is stretched while changing the stretching tension at a constant cycle using a guide 6 provided in the guide 6, highly molecularly oriented parts and low molecularly oriented parts alternately exist along the length of the undrawn yarn 1. This results in a drawn yarn 1'.

The non-uniformly drawn yarn 1' is aligned with a thermoplastic filament yarn 2 having a uniform molecular distribution σ''.
(Supply) Roll 4, heater 7, false twisting spindle 8, and delivery roll 9 apply false twisting to the fabric, and it is rolled up into a package 11 via a flexible control roll 10.

As described above, according to the present invention, the crimped part ``the part where the B part of the C yarn is wrapped around the D yarn, the A part of the C yarn, and the D yarn are all crimped together. It is possible to provide at low cost (no twisting process required) a filler yarn that can be applied alternately with 0 and 1.

Historically, since the wrapped portion has low elasticity (due to the presence of the core), the crimped yarn as a whole also exhibits low elasticity.

EXAMPLE A highly oriented portion of a polyethylene fiber yarn spun at a spinning speed of 3000 m/min (1/-1) was first stretched by a factor of 1.5 using the process shown in FIG. (Q!l orientation 0.1.48) and the low oriented part drawn 1.1 times and the thread 1' formed with a period of 10 m and having an average fineness of 75 tenier and consisting of 36 filaments. Orientation degree 0.1
Polyethylene terephthalate consisting of 2.1 filaments with a fineness of 75 tensile yarn made of fully drawn yarn of 5.00%.
times/'m1 Machining speed 100m/min, overfeed 3
% false twisting was performed.

When the obtained yarn was knitted and dyed by a conventional method, the second
As shown in the figure, it combines a slab-like appearance with a dandan effect.)
A loose knitted fabric not seen in conventional products was obtained.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of the supplied yarn employed in the present invention, FIG. 2 is a conceptual diagram showing the appearance of the special crimped yarn obtained by the present invention,
FIG. 3 is a route map showing one example of a process for carrying out the present invention. A... Part with a high degree of molecular orientation, B...
A portion with a low degree of molecular orientation, C...A yarn having k and B alternately, D...A yarn that is combined with C and subjected to false twisting at the same time, 1...・Undrawn yarn, 1′-・・・・・・
Undrawn yarn 1 is irregularly stretched and pressurized, and has alternately highly oriented areas and low oriented areas; 7... Heater 8... False twisting spindle.

Claims (1)

[Claims] 1 A thermoplastic long fiber yarn C in which portions A with a high degree of molecular orientation and portions B with a low degree of molecular orientation exist alternately along the length direction of the yarn, and a uniform degree of molecular orientation, and the degree of orientation is equal to that of the yarn C. By aligning thermoplastic long fiber yarns that are substantially the same as the A portion and guiding the false twisting device, the B portion of the C yarn is wrapped around the D yarn in the false twisting portion, while the C yarn is wrapped around the D yarn. A method for producing a special crimped yarn, characterized in that the A part and the D yarn are mixed with each other.