JPS58169530A - Production of slub yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a slub yarn made of threads of thermoplastic synthetic fibers, and further includes: *Ll;t. The core yarn and sheath yarn are merged together, and slab portions are formed intermittently.
This invention relates to a method for producing slab yarn in which the yarn is heat set in the untwisting region.

It is already known that slub yarn can be produced by false twisting two or more filaments of thermoplastic synthetic fibers that are supplied in an array, for example, in d% Publication Publication No. 5-2825.
Bulletin No. 8, 4I Publication No. 347-49459,
There are many prior art techniques such as Japanese Publication No. 50-55147. In all of these conventional methods, both core and sheath yarns are merged and heat set in the heating region of the false twisting process, and the conventional false twisting machine is used to
Although it is easy to use in manufacturing equipment, since the heat-set slub yarn is twisted in the untwisting region, the residual torque of the resulting yarn is high, and it is difficult to use without proper twisting treatment such as additional heat-setting. It has a problem that it cannot be used as is in the weaving and knitting process. Furthermore, even if the yarn axis length of the slab portion and the arrangement interval thereof are adjusted to a predetermined value in the heating region, there is a drawback that this may be disrupted due to friction with the false twisting means.

The present invention solves the above-mentioned problems faced by the conventional technology, and maintains the shape of the slab in the heating area.
Furthermore, the purpose is to provide a yarn manufacturing method in which the residual torque of nine yarns produced is small, and the yarns that have undergone the slub yarn formation process can be used as they are in the weaving and knitting process, and are thermoplastic synthetic fibers. When producing slub yarn made of yarn, the core yarn is supplied by a supply roller consisting of a pair of gripping rollers, a false twisting heating device consisting of an air jet nozzle, a heater for heat setting the yarn, and a pair of gripping rollers. The sand is sequentially passed through the sand feeder ■-2, which rotates at a slow circumferential speed like a roller, while the sheath yarn is supplied and wound around the core yarn between the supply roller and the false twisting heating device, and then the sheath yarn is attached to the core yarn. Let me.

The gist is to form a slab portion by reciprocating the confluence point of both the core and sheath yarns. The method of the present invention will now be explained in a different manner with reference to examples shown in the drawings.

FIG. 1 is an explanatory diagram showing the outline of an apparatus for carrying out the method of the present invention, and 12#A is a front view showing the morphological characteristics of the obtained slab yarn.

In Fig. j111, the core yarn O made of a filament of thermoplastic synthetic fiber passes through the feeding guide (1), the A yarn guide (T, the feeding roller C5 consisting of a pair of left and right gripping rollers), and the air jet. False twist heating device consisting of nozzles (4
), a heater (!9), which serves to set the yarn heat, and a feed-out roller (4) formed of a pair of left and right gripping rollers and rotating at a slower circumferential speed than the input and supply roller (5). The sheath yarn S made of filaments of plastic synthetic fibers has a B yarn guide (7), a tension adjustment load (8),
It sequentially passes through the O yarn guide (9) and then the A supply roller (5).
) and the false-twisting heating device (4), the core yarn (6 Go to 12
It wraps around the core yarn C while forming a crossing angle e of 0+, forming a slab part in which 8 sheath yarns are intermittently wound in multiple layers, and then, together with the core yarn O, is wrapped in a false twist heating device (4) K. 2) After being twisted, the heating point becomes untwisted immediately after the heating point, and it is entangled by the heater (5) installed in the yarn running area, and the nine-way yarn C.
Form 8 is heat set. The heat-fixed yarn passes through a feeding roller (a chrysanthemum) and is then wound into a package (11) by a winding roller (10).

To explain in more detail the above-mentioned overlapping in slub yarn production based on FIGS. 1 and 2, as mentioned above, the sheath yarn S has an intersection angle θ of 60' to 120° with respect to the running direction of the core yarn CO. While forming, the tension adjustment load is freely drawn out through the thread, while the core yarn is over-tweeded at a preset yarn feeding ratio of 10 to 50%.

When the tension of the sheath yarn 8 is lower than the tension of the core yarn C, the sheath yarn 8 is wound multiple times around the core yarn C.Then, the tension of the sheath yarn S increases, and both yarns S and C The confluence point moves from point 0 in FIG. 1 to point P.

During this movement 11, the sheath yarn S turns the core yarn C in a spiral shape Km at a large twisting pitch, and as shown in Fig. 2, O! form a section. When the tension reaches the limit, the sheath yarn 8 suddenly increases its O biting amount, and although the tension is slight, it temporarily collapses, and the joining point with the core yarn C occurs as quickly as the running speed of the skeleton yarn O. It moves to point 0, and by 1iKTh beyond that point, the X section shown in FIG. 2 of multiple windings is formed. At the point when the tension of the sheath yarn 8 reaches the lowest point (Tol), the biting amount reaches the maximum.Then, the confluence of both the core and sheath yarns 0 and 8 again points in the direction of the 2 point. move and repeat the previous behavior.

The yarn subjected to false twisting has a self-adjusting function of surface yarn feeding tension as described above, and due to the slipping, the twisting point is periodically shifted in the longitudinal direction of the yarn Kfii between points P and 00. As a result, it repeatedly ascends and descends.

As shown in Fig. 2, in the longitudinal direction fR, a multiple winding part X with a dense twist pitch and a single winding part Y with a relatively coarse pitch are arranged alternately at irregular lengths. It is formed.

The yarn in which the multiple winding parts heater (5
) K is introduced and the shape is heat-fixed, and one winding roller (10
) K is wound up as a package (11) having a slab.

In carrying out the present invention, as the core yarn 0 and the sheath yarn 8, any yarn can be used as long as it is made of thermoplastic synthetic fibers, but yarns made of filaments are preferable, and the core yarn 411 is It is better to make the sheath thread 8 thinner than 0 in terms of preventing displacement of the end love portion. However, in the method of the present invention, since jet air is used as the turning force for the yarn for false twisting, the air force that increases the yarn K11n is a problem, and if the yarn used is too thin, the false twisting force decreases. However, it is not possible to produce excellent yarns, and the finest single fiber fineness is 1 denier.

The false twisting heating device (4) comprising an air injection nozzle using the INK of the present invention is the twisted false twisting device described in 4I Publication No. 36-10511. The swirling force by the false twisting heating device (4) depends on the nozzle shape and air injection pressure, and the adjustment of the spinning state such as the number of twists usually depends on the latter.

The spinning conditions, that is, the yarn feeding conditions and the number of false twists, differ depending on the type of thermoplastic synthetic fiber used as the knot forming material, so they cannot be uniformly specified, but the tension of the core yarn C If the tension is too high, it will not be possible to form a slab part, and the shape of the slab part will be extremely difficult to form, with a leap of 1P to 15F, and if it is too low, the machining rate will be reduced to III. , preferably 1, whereas sheath thread 8
The tension should be 1f or less, which is close to zero tension.

In addition, it is necessary to support the yarn so that it can be freely fed by being pulled by the preceding yarn.

Further, the yarn temperature in the heating region is set to be above the glass transition point of the fiber and below the melting point, and when both the core and sheath yarns are polyester fibers, it is necessary to maintain the yarn temperature at 220° C. to 255° C.O for about 1 second.

The method of the present invention has excellent form specificity through the process described above, and the nine-knot portions, that is, the slab portions are arranged periodically and irregularly in the longitudinal direction of the yarn.
As shown in I@l, move the O yarn guide (9) to the reciprocating device (
12), thereby moving the distance 1 between the C yarn guide (9) and the core yarn C with a predetermined amplitude, or by moving the A supply roller (j's rotational speed along a predetermined speed - 1 line). Shift the gear.

By varying the tension of the core yarn 0, it is possible to consciously adjust the length of the slab portion and the arrangement interval thereof.

The present method is as described above, and since an air injection nozzle is used as the false twisting device, it is similar to the case where false twisting pins are used (forming in the heating area, moving the slab part, disappearing). In particular, the diameter of the rounded slab is increased to increase the effect of exposing the slab portion, and the effect is improved in some cases.

In addition, since the yarn is heat-set in the false-twisting/untwisting area, there is no twisting torque, and the yarn from the manufacturing process can be woven immediately.
It has an effect that can be used for.

Example 1 A polyester multifilament (total denier 150d% S2 filament) was used as the core yarn, and a polyester (7)-r) filament (total denier #75d, 56 filament) was used as the sheath yarn. The method of the present invention can be carried out under the following conditions using an apparatus as shown in .

Circumferential speed of supply ■-ra jll! 50*/min Tension on the core thread on the supply side 7y Sheath thread #! c# Enter O~α5y Tension sheath yarn supply status Air pressure of freely withdrawable false twisting device t25 Carp/- Yarn in heater +11
Degree 220℃ Heater passing time tO
a Second C Yarn guide distance (1) 1000 Peng fixed The round yarn obtained under the above conditions has a total denier of 520, and the knots of 170 words from the length 55ss shown in Fig. 2 are 2~
It exists at a ratio of 5/-, the weft is the weft, and the warp is 75
By using polyester filaments of d/56 F to weave a plain weave fabric, a fabric with a special surface effect due to slabs can be obtained.

Example 2 Processing was carried out using the same equipment as in Example 1, using polyester 75 denier 56 filament as the core yarn and polyester 50 denier 24 filament as the sheath yarn.

Peripheral speed of A supply seam - 50s*/min Tension applied to the core yarn on the supply side 5f core yarn A supply roller (5) to feed roller (draft rate between ω + 24-5 X supply side O sheath Tension applied to thread 0~a51 Sheath thread supply form embroidery
Pneumatic pressure of freely withdrawable false twisting device
tsm/ai O yarn temperature in heater 215°C Heater elapsed time toe seconds 0 yarn 7 Guide distance (ffi) 200 yen fixed The yarn obtained under the above conditions has a total denier of 225, as shown in Figure 2. A shankung-like fabric with knots of 25 to 60 knots in length can be obtained.

A brief description of the apparatus for carrying out the method of the present invention is shown here!
The clear drawing and FIG. 2 are front views showing the main parts of the slab yarn that can be obtained by the method of the present invention.

+11---One-time feeding guide (Sea--A yarn guide (5)-'----me supply roller (4)---One-fold twisting heating device (1)----Heater" (4- −
-Issendyodashi--Ra false--B-ya ν guide (
8) --- Tension adjustment load (Car - C Yarn guide (Cut-low winding roller Fig. 1 Fig. 2

Claims (1)

[Claims] 1) When producing slab yarn made of thermoplastic synthetic fiber yarn, the core yarn is heated by a supply roller consisting of a pair of gripping rollers, a false twisting heating device consisting of an air injection nozzle, and the yarn is heat set. The sheath yarn is supplied to the core yarn between the supply roller and the false-twisting heating device, while the sheath yarn is supplied to the core yarn between the supply roller and the false twisting heating device. A method for producing a slub yarn characterized by forming a slab portion by making the core yarn accompany the core yarn and reciprocating the confluence point of both the core and sheath yarns. 2) The torque denier of the sheath yarn is adjusted to the torque of the core yarn. 9. A method for producing a slub yarn according to claim 1, wherein the yarn is made thinner than a denier. 5) A method for manufacturing a slab yarn according to claim 1 or 2, wherein the rotation speed of the supply roller is changed intermittently. 4) The method for producing a slab yarn according to claim 1 or 2, wherein the yarn temperature f in the heater is set to be above the glass transition point and below the melting point.