JPS58126322A - Production of core-sheath yarn - Google Patents

Abstract

PURPOSE:Self-twisting is effected by intermittent nipping with the intermittent nipping rollers and by false twisting with a pair of belts to produce fine-denier core-sheath yarn containing one wadding yarn. CONSTITUTION:Two untwisted short fiber bundles Y1, Y2 are fed to between a pair of intermittent nipping rollers d1, d2, meanwhile a continuous yarn Y3 is sent into groove e on the roller d1, then into the false twister f where a pair of endless belts f1, f2 come into cross contact with each other. Both short fiber bundles Y1, Y2 and the continuous yarn Y3 are combined by the yarn guide g to wrap the continuous yarn as a wadding yarn with both short fiber bundles Y1, Y2 and effect self-twisting in S and Z alternate directions, thus producing a core- sheath yarn Y.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of one common sense M1 yarn or spun yarn (hereinafter referred to as continuous yarn) serving as a core yarn and two or more short fiber bundles serving as a sheath yarn. One core-sheath thread.

This invention relates to a method for producing core-sheath yarn at a higher speed than the C/L'7 twist method.

Conventionally, core-sheath yarns manufactured by the 7-p twist method are composed of two core yarns and two sheath yarns, and it is rarely seen that only one core yarn is used. The number of twists of S twist and 2 twist that can be imparted to the short fiber bundle spun to make the sheath yarn is small, and it is not possible to impart sufficient strength to the short fiber bundle to withstand the spinning force. Will it break with just one core thread? This is to help you get the hang of it. On the other hand, there is a method in which core-sheath yarn is produced by twisting with a spindle or the like to give actual twist.

The maximum spindle rotation speed is 20,000 times/min.
In addition, in order to maintain the strength of the spun yarn to withstand the spinning force, a twist of t0500 to 1000 times/m is applied, and the spinning speed is only about 20 to 40 m/min. .

It requires a large number of spindles due to low productivity. Also 7 "5"
Even if a thin core yarn is used for the sheath yarn, it is difficult to produce fine i3 silk yarn because it requires a large number of sheath fibers to completely cover the core yarn. . In addition, as mentioned above, core-sheath yarns are only thick yarns even though they use expensive thin yarns as core yarns, so even though they have excellent properties, they are not necessarily suitable for manufacturing high-end clothing. Moreover, as mentioned above, the productivity is low, so it is extremely disadvantageous in terms of cost as well.

The present invention was made in order to solve the above-mentioned drawbacks of the conventional manufacturing method for core-sheath yarns, and it is possible to produce fine yarns consisting of one core yarn with good productivity. can. The purpose of the present invention is to provide a method for manufacturing core-sheath yarn using self-twisting.

In other words, in the present invention, a plurality of short fiber bundles, which are drafted from a conventional pipe and spun from a front lobe at regular intervals, are placed in the central part of the roller circumferential surface through a groove zone for passage through the core system. A pair of 1ill grippers, with one lobe cutting out a part of its circumferential surface, are fed into both sides of the groove of the gripper, which rotates while pressing against each other intermittently.
At the same time, the continuous yarns are fed into the groove zone and passed through the intermittent gripping loaf, and then the continuous yarns are arranged parallel to each other between several m of short d&JIB bundles, and intersected with each other. A pair of M running while touching each other? End shape μ
Introducing a false twisted body consisting of

By heating in one direction, each of the plurality of short fiber bundles is given an alternating twist of S and Z, and then a plurality of short fiber bundles with a substantially untwisted string 1@yarn are formed. - A method for producing a core-sheath yarn, which is characterized in that the fibers are pinched and combined, and a single core-sheath yarn is formed and taken off while self-twisting is performed based on the twisting torque of a plurality of short fiber bundles.

The configuration of the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a simplified perspective view of an apparatus used in the method for manufacturing core-sheath yarn according to the present invention, and FIG. 2 is a side view thereof. A pair of intermittent gripped loaves (DL) in a non-twisted state are spun from a front loaf ial while a regular draft mechanism (not shown) is footed and kept at a constant interval; As shown in FIG. 2, part of the circumferential surface of one of the lobes (C2) is notched, so that the two lobes (C2) are intermittently pressed against each other by nine rotations. Further, a groove (e) for passing a continuous yarn (ys) serving as a core yarn is bored in the center of the curved surface of the lobe (al).

The short fiber bundles (Yl) and (Ym) are fed to the pair of intermittent gripping rollers (ctx) and (ax) by the silk thread guide (C1).

(CX) is carried out on both sides of the groove zone (el) of the lobe (dl). Then, this short fiber bundle (Yl), (yg)
At the same time as feeding, the continuous yarn (Ys) is passed through the core yarn guide (bl) provided between the sheath yarn guide (C□) and (C8) and a pair of intermittent gripping rollers (dx), (dg). This short fiber is sent into the groove zone (el).
(Yl), (Ym) are a pair of intermittent grip loafs (ds)
, (dx) + more while being nipped intermittently.

Also, the continuous yarn (Y,) was not nipped at all.

Between the pair of intermittent gripping loaves (al) and (dm), the core thread guide (bl) located below, and the sheath thread guide (0 pieces), (C;) attached to both sides thereof, are connected. The false-twisted body (a pair of endless pels of fl) (f□) and (fa) are fed into the cross-contact point between them. In the direction of the arrow (Nl), the (fs) travel in the direction of the arrow (N2) and come in cross-contact with each other on a part of one side, so that they are fed into the cross-contact point as described above. Continuous yarn (
Ys) and short fiber bundles (Y>).

(Yg) means that while passing through the cross-contact point, the two endless rings are held and wrapped between Cf1> and (fa), and are generated by the running of the bells) (fi) and (fx). By the twisting force of /L/, which is the sum of the frictional force in the cross direction and the yarn winding force acting in the direct direction,
False-twisted and continuous yarn (Ys)
and short fiber bundles (Y□).

In (Yl) and t, the S twist propagates in the upper part of the false twisted body if), and the special fC short fiber bundle (Yl), (yz) and the intermittent gripping a-f (tLD).

If (C2) is not gripped, the false twist propagates to the nip point of the front loaf fa) and provides strength sufficient to withstand the spinning force. In addition, the lower portion of the false-twisted body (f) does not allow z6 ri to propagate, but it is short.

(Overnight child-A'd=之;Book:→yo4tan-"Randjishi:4ran;Yelel',-
Fiber m bundle (Yl), (Yi) t is an intermittent grasping loaf (d
l), (Due to the VA action with a and c, S twist and Z twist are applied alternately in almost the same phase. In other words, the short fiber bundle (" l),
(Yg) The S twist to be applied is carried out by an intermittent gripping roller (dl
), (da) Due to the intermittent gripping, the twist density changes periodically, so after passing through the false-twisted body (f), the twist returns to zero due to the Z twist, which is originally a reverse twist. There is an excess or deficiency in the untwisting when it should be done, and as a result, the S twist and the Z twist are applied alternately. On the other hand, the continuous thread (Y,) has 9 intermittent grasping-lobes (dx), (
The false-twisted body (f) is false-twisted by Ic, completely unrelated to the action of the intermittent gripping loaf (dt) and (dl), in order to pass through the groove zone (e) of the roller (do) of the As a result, after passing through the false twisted body (f), the twist is substantially t.
It becomes zero.

Next, the twisted double-layer fiber bundles (Yl), (Yz) and continuous yarn (Yl) are combined by a yarn guide (9) to form two double-layer short fiber bundles (Y□).

(Y2) is a continuous yarn (Yl) that becomes a core yarn by twisting and twisting.
) while wrapping S and Z alternately self-twist (self-twisting) to form one core-sheath thread (Yl), delivery loaf (h□), (hp)
1) is rolled up. Formation of core-sheath yarn by self-twisting 1 At this time, since the continuous yarn (Yl) that will become the core yarn is in an untwisted state, the short fiber bundle (Yi) that will become the sheath yarn, (
The enveloping effect of Yx) is enhanced, and a core-sheath yarn with good coverage can be obtained.

The above explanation regarding method 1 of the present invention is performed in the case where two short fiber bundles to be the sheath yarn are used (although this was done with difficulty), it is carried out in exactly the same way when five or more short fiber bundles are used. can do.

As described above, the method for manufacturing the core-sheath yarn of the present invention is as follows.

This method utilizes a self-twisting system in which intermittent gripping rollers (intermittent gripping) and a false twisting body consisting of a pair of belts cooperate with the provision of false twisting. Unlike the method of imparting alternate S and Z twists to the yarn, which involves the left-right reciprocating movement of a pair of lobes, which can impart only a small amount of twist due to a large amount of twist, and which often causes fibers on the surface of the yarn to fall off, the spinning force is It is possible to provide short fiber bundles that are to become sheath yarns with a sufficient number of twists to maintain strength enough to withstand the Only one thread is required, and it is possible to easily obtain a core-sheath thread for high-quality clothing with a shaft count in which the core thread is a single synthetic filament, which has traditionally been made into a thin cotton thread, and the sheath thread is a thin cotton thread. The #1 core-sheath thread for high-end clothing, which has the functionality of filaments such as high strength, thermoplasticity, and easy-care properties, and the good texture, dyeability, and feel of natural fibers, can be produced at high speed. It is something that can be manufactured.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Two cotton rovings of 20 degrees/30 yards were coated with 28.8
Two short fiber bundles (Yl) and (Yi) obtained by multiplying the daughter μ draft are arranged in the arrangement shown in FIGS. It was spun from the front roller (a) of d. This short fiber bundle (Y□), (
A pair of intermittent gripping rollers (dx) are provided at 12 points below Ya), a silk thread guide (CI) is installed at (ag), and (C
2) was introduced. Intermittent gripping roller (dl), (dx
) are both tc diameter 15cm, 42 tx norm: 1
With the roller (d2), the loaf (d>) has a groove 5B in the center of its curve for passing the core yarn, and the roller (d2) has its curve extending over 180 degrees and has a depth of 5 angles. The pressing force of both rollers (dyu) and (da) at the location where the notch is not cut out is 5#.

Next polyester multifilament A (50d/
12f) (Yl) One yarn is introduced into the groove zone (e) of the loaf (d□) through the core yarn guide tbl. Next, a polyester multifilament yarn (Yl) and short fiber bundles (Yl) and (yg) are placed below 41, passing between a pair of intermittent gripping rolls (d□) and (ax). The sheath yarn guides (C'l), (c;) are installed above the false twisted body (if) at 8 intervals, and the core yarn guide (b') located in the center of the sheath yarn guides (C'l), (c; A pair of endless bells (fn) and (rg) of the twist extension body (f) are fed into the cross-contact points. Endless Peμ) (ft), (re)
Both have a thickness of 211 ft11!31 m and are driven by a belt drive device (not shown), and the contact pressure at the cross-contact point is 509/d. This pair of endless pels) (fx).

When passing 1n through the cross-contact point of (fz), polyester multifilament yarn (Y3) and short fiber bundle (yt),
Short fiber bundle (Yx) after one pass after false twisting (yt)
, (yg) are alternately given S twist and Z twist, and polyester multifilament yarn (Y3)
becomes non-twisted, and is combined at the core/sheath yarn guide (q) 9 times, and the short fiber bundles (y,) and (Yi) wrap around the polyester multi-fiber (MS) and are twisted by 7 μm. One core-sheath yarn (Yl) is formed with a delivery loaf (hu
), , (ha) and then it is rolled by the winder (1).

In this case, 0.8% is applied between the front loaf ((transfer) and a pair of intermittent gripping rollers (al), (dm), and a pair of intermittent gripping loaf (dx), (dg) and delivery loaf (ht). , 2.2% between (ha), delivery loaf (h+), t between (hg) and winderow (1)
Overfeeds of 1 and 5% were given, respectively. In addition, the spinning speed of short fiber bundles (yl) and (yz) is 200
m/min, false twisted body (endless beam of fl) V (f
t), (ft) surface speed is 800 m1/min
Met.

As a result, it was possible to produce a good core-sheath yarn as shown below.

[Brief explanation of drawings]

Figure 1 shows the device used for *t+a of the present invention (11□+)
It is a schematic perspective view, and FIG. 2 is a 111-plane view thereof. (Yi), (Yg)... Short fiber bundle, (Y3)... Continuous yarn. (Y)...6 Sheath A, fa) - front loaf. (b), (po)...core thread guide, (Ct), (e
x), (C'i), (a;)... sheath thread guide. (ax), (am) ''''intermittent grasping loaf,
Grooves on the circumferential surface of tel-(dl). if)...false twisted body, (fyu), (i's)...
Endless tape. (su)...Core/sheath thread guide, (hx), (hi'
)...Delivery roller. (1)...Winder patent applicant Unitika Co., Ltd. 1 Figure 21!1

Claims (1)

[Claims] (1) The groove of a pair of intermittent gripping rollers in which a notched loaf with a part of the circumferential surface cut out and a roller having a groove of a constant width in the center of the circumferential surface are intermittently pressed against each other and rotate. Multiple non-twisted short fiber bundles are dofted using conventional methods on both sides of the belt, and are spun and fed at regular intervals from the front loaf.
At the same time, continuous threads are fed into the grooves and passed through the intermittent gripping loaf. Subsequently, the short fiber bundles are introduced into a false-twisted body consisting of a pair of endless belts running in cross-contact contact with each other, and heated in one direction, so that each of the plurality of short fiber bundles has S,
(9) The substantially untwisted continuous yarn is sandwiched between a plurality of twisted short fiber bundles to form a yarn, and based on the twisting torque of the plurality of short fiber bundles. (A method for producing a core-sheath yarn, which comprises forming one core-sheath yarn by cell twisting the continuous yarn package 1 and taking it off.