JPS59116440A - Production of coated 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 Using the spinning spinning machine of the present invention, core-sheath type low-melting point long fiber yarn (hereinafter referred to as core-sheath type low-melting point yarn (1)) is processed into short fiber roving (hereinafter referred to as coarse yarn). It is covered with 7 wreaths of thread (called yarn) and spun.
The present invention relates to a method for producing coated yarn with high ironing resistance.

Conventionally, the method for producing coated yarn with ironing resistance using a ring spinning machine involves feeding double roving fiber yarns to a draft zone, drafting each yarn separately, and maintaining the separation of the two yarns. For each of the two separated roving fiber yarns, one synthetic fiber filament core yarn is supplied under tension from above the front loaf through a collector.

Each of the core yarns and roving fiber yarns are mixed to create a state in which two roving fiber yarns of equal amount on the left and right are sandwiched between the two synthetic fiber filament core yarns on the left and right sides, and then spun from the front loaf. A method of obtaining a core yarn with a single yarn structure by plying and twisting it immediately after it is made (Special Publication No. 50-51221),
Alternatively, a twisted multifilament yarn of 8 to 20 T/M is opened by guiding it through an electric opening device having two positive and negative poles with a voltage of at least 1000 ports, and the yarn is opened in the opened state immediately before the front loaf. A method for producing composite yarns in which the distance from the first pole to the edge point of the front roller is 4.0 to 16.01'J when the short fiber yarn is overlapped with short fiber threads and heated and wound. -274494) etc. are known.

However, the former method uses two synthetic fiber filament yarns that intertwine a roving fiber yarn (
This prevents the covering fibers from peeling off and falling off, but the covering fibers are simply sandwiched between only two synthetic fiber filament yarns.

It is not possible to completely sandwich all the fibers in the covering portion, and it is not possible to obtain a covering yarn with excellent scorching resistance. Furthermore, there are restrictions on the blend, spinning rate, and spinning count of spun yarns, and supplying two roving fiber yarns and two synthetic fiber multifilament yarns in the same draft area is difficult to do in a narrow space. The spinning work, such as installing a feeding device, becomes extremely complicated.

Realizing this will be extremely difficult. Next, the latter method is
A yarn obtained by a method of opening a multifilament yarn, superimposing it with a short fiber yarn in the opened state, and heating it is a so-called mixed fiber yarn and is not a covered yarn. Also, in order to spread the multifilament yarn to be supplied to the front loaf, it is necessary to install an electric spreading device, which is complicated and requires a high level of management.
Realizing this will be extremely difficult.

In view of the above points, the present invention uses a relatively simple method to improve the drag resistance, which is a drawback of conventional covered yarns consisting of long fiber yarns and short fibers covering them. It is something.

That is, the present invention supplies the roving to the backloaf of a ring spinning machine, and further supplies heavy fiA, which is a low melting point component, to form the sheath.
and the weight B of the normal melting point component forming the core is 0.
A core-sheath type yarn with a low melting point length of 25 to 1.2 [1Q yarn is supplied between the apron and the front loaf, spun together from the front ruler, twisted, and the core-sheath type yarn is This is a method for producing a coated yarn, which is characterized by covering the yarn with seven leases and applying a stretching or pressing action at the same time as heat treatment. Furthermore, there is a method for producing a covered yarn using, as the core-sheath type yarn, a yarn whose core portion is made of a polyester component with a normal melting point and whose sheath portion is made of a polyester component with a low melting point.

Below, four configurations of the present invention will be explained in detail. FIG. 1 is a schematic side view of a ring spinning machine for spinning coated yarn used in the method of the present invention, and FIG. 2 is a schematic side view of a ring spinning machine that spins coated yarn used in the method of the present invention.FIG. FIG. 2 is a schematic side view of an apparatus for producing covered yarn according to the method. First, the roving (R) is supplied from the roving pobbin (Bl) to the pack roller (1) of the spinning machine shown in Figure 1, and the apron (2
) to Nigeron (2) and Front Loaf (3
) to give the main draft between. In this case, the total draft is preferably 50 to 70 times the hide foot. Next, from the long fiber yarn pobbin (B2) above the 70-ton trough (3), the core-sheath type low melting point yarn (toff purse guide (4) for rolling the roving (8)
) and the guide (5), then the apron (2) and 7.
The roving (R) is fed to the center of the fleece between the front loaf (3), and both are spun from the front loaf (3), heated by the rotation of the spindle (6) and the tofu tube (7). Then, the core-sheath type low melting point yarn (F') is made into a roving (RL
The coated yarn (Y) is wound around a spinning bobbin (8) and taken out.

Next, as shown in Figure 2, the coated yarn (force) is unwound from the spinning pobbin (8), passed through the guide (9) to the feed roller, the heat drum (b), and the delivery roller (2).
The coated yarn (Y) is made into a coated yarn (Yc) according to the present invention, which is wound into a cheese. In this case, the coated yarn (force) is subjected to heat treatment using a heat drum (b) and simultaneously stretched between the feed roller Q and the delivery roller (2), or is pressurized by the delivery roller (2). In addition, when cotton is used for the roving (1), in order to prevent yellowing due to heat treatment and to facilitate drawing, the coated yarn (1) may be coated with a humidifying device ( ). The above-mentioned core-sheath type low-melting point yarn is a core-sheath type composite filament yarn whose core part is made of a high-melting point component and whose sheath part is made of a low-melting point component, and is coated as described above. By heat-treating the yarn (Y), the low melting point component forming the sheath softens, and the rovings (short fibers of the mother fleece (hereinafter referred to as coated short fibers)) that cover it are softened. In this case, the coated yarn (Y) is stretched or pressurized, and the coated short fibers are sufficiently held and penetrated into the sheath component and are completely adhesively fixed, resulting in an extremely The coated yarn (Yc) obtained by the method of the present invention has a high resistance to rubbing.

The weight A of the low melting point component forming the sheath portion of the core-sheath type low melting point yarn fF) used in the method of the present invention and the weight B of the high melting point component forming the core portion are 0.25 to 1. Must be 2. If the weight settling is less than 0.25, the proportion of the sheath component is too low, resulting in a core-sheath type composite yarn (F).
Even if it could be formed, the bulk of the sheath and the adhesion effect between it and the short fibers covering it would be extremely poor during heat treatment, stretching, and pressurization, and it would not have sufficient resistance. I can't get enough of it.

In addition, if the weight ratio is greater than 1.2, the proportion of the sheath component is too high, and the adhesion between the sheath component and the short fibers covering it during heat treatment, stretching, and pressurization is poor. is large, but
The strength of the resulting covered yarn (Yc) is significantly reduced and its hardening is noticeable, so there is no point in using long fiber yarn. Further, as a typical core-sheath type low melting point yarn (F'), there is one in which a polyester having a normal melting point (approximately 260° C.) is used for the core portion and a polyester having a low melting point is used for the sheath portion. As the low melting point polyester component, a slightly polymerized polyester μ obtained by copolymerizing polyethylene terephthalate with isophthalic acid, p-oxybenzoic acid, or sodium nullhoisofucuric acid can be used; in that case, the copolymerized component is M
When it is mol%, the heat treatment temperature T'C is.

It is preferable that the range is 225-L9M≦T≦265-3.9M. T (in the case of 225-5,9M.

The heat treatment temperature is too low to sufficiently soften the low melting point polyester component, so the sheath polyester component and the short fibers covering it are sufficiently bonded during heat treatment, stretching, and pressurization. I can't. Also,
T) In the case of 265-3.9 M, the heat treatment temperature was too high, and the low melting point Borienute, 7L/component in the sheath part melted and fell off, deforming the sheath part, resulting in □1＼ Kamofuji twist. It is possible to form only such a coating.

As described above, the method for producing a coated yarn according to the present invention involves heat-treating the coated yarn, which is spun by covering a core-sheath type low-melting yarn with a roving fleece using a ring spinning machine. By simultaneously drawing or applying pressure, the low melting point component of the sheath part of the core-sheath type low melting point yarn is softened and sufficiently bonded and fixed to the covering short fibers, thereby preventing the short fibers from peeling off and falling off. prevent,
Therefore, a coated yarn with high conjugation property, that is, high scratch resistance is produced, and this is a novel (and thus inventive) method for producing a covered thread.

Examples of the method for producing covered yarn according to the method of the present invention are listed below.

Example 1 Using the spinning machine shown in Fig. 1, roving for combed 80'S blended cotton from back loaf (180 gelen/30 Yds) was produced.
is supplied, the roving is drafted at a total draft of 50.1 times to form a roving fleece, and in the center of the roving fleece,
From above the front top roller, a core-sheath type low elongation point polyester fiber yarn (30d/12f) (sheath part A = isophthalo acid 20 mol% copolymerized polyethylene terephthalate Ig part B: 't' polyethylene terephthalate,
A/B = 1.0) and ear fil/Ci 2
A 8/72 50'S coated yarn was spun. Next, the coated yarn was subjected to a dry heat treatment at 180° C. while being stretched 1.05 times and wound to produce a coated yarn.

The binding properties of the covered yarn were compared with the binding properties of a covered yarn obtained by dry heat treating and drawing 9 ordinary polyester filament yarns covered with short fibers under the same conditions, and the results were as follows.

Note: Compatibility refers to the number of times of friction until the short fibers covering the coated yarn begin to move due to friction, as described in Patent No. 601.
This refers to the value measured using a No. 116 warp binding force tester (manufactured by Hiruta Riken ■).

From the above results, it can be seen that the covered yarn produced by the production method according to the present invention has extremely high conjugation ability, that is, resistance to crushing, compared to other covered yarns.

Example 2 In the same manner as in Example 1, a coarse yarn for combed 60'S blended cotton (280 gelen/1Yd8) was supplied, and the coarse yarn was drafted with a daughter M draft of 60.9 times to form the coarse yarn fleece. core-sheath type low melting point polyester filament yarn (50d/24f) (sheath part A: isophthalic acid 40 mol% copolymerized polyethylene terephthalate, core part B: polyethylene' terephthalate, Δ=1. 0) and Efil/C〼34
/66 36'S coated yarn was spun. Next, the coated yarn was subjected to a rolling treatment at 80° C. while being stretched 1.05 times and wound to produce a coated yarn. The binding properties of the covered yarn were compared in the same manner as in Example 1 with that of a covered yarn obtained by dry heat treating and drawing under the same conditions and covering a regular polyester filament yarn with short fibers, and the following results were obtained. It was like this.

Compatibility of coated yarn covered with fibers Based on the above results, the same results as in Example 1 were obtained.

It can be seen that the coated yarn according to method e of the present invention has extremely high resistance to scorching compared to other coated yarns.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a ring spinning machine for spinning coated yarn used in the method of the present invention, and FIG. 2 is a schematic side view of a heat treatment drawing and pressing device for producing coated yarn according to the method of the present invention. It is a schematic side view. (F')... core-sheath type low melting point yarn, (R)... roving,
(Y)...Coated thread, (Yc)...Coated thread, (1)...Back roller, (2)...Apron r f3)...Front roller I (4). ... Tofubanu guide, (5) ... Guide, (8) ... Spinning pobbin, (IL ... Feed roller, aυ ... Heat drum, @ ... Delivery loaf, (11 ... Cheese Patent applicant: Unitika Co., Ltd.

Claims (2)

[Claims] (1) Feed the roving to the packloaf of the ring spinning machine. Furthermore, the weight A of the low melting point component forming the sheath and the core 0.25
The core-sheath type low melting point long fiber yarn of ~1.2 is supplied between the apron and the front roller, and both are spun from the front loaf and twisted to form the core-sheath type low melting point long fiber yarn. A method for producing a covered yarn, characterized in that it is covered with seven leases of the above-mentioned roving yarn, and then subjected to a heat treatment and at the same time subjected to a stretching or pressing action. (2) The coated yarn according to claim 1, wherein the core-sheath type low-melting point long fiber yarn is a yarn whose core portion is made of a polyester component with a normal melting point and whose sheath portion is made of a polyester component with a low melting point. manufacturing method.