JPH05132829A - Production of double yarn for rubber for resin reinforcement - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rubber or resin-reinforcing composite yarn at low cost, which is suitable for obtaining a composite having excellent resin adhesiveness, high strength, and excellent appearance. [Structure] A low-elongation filament having an elongation of 35% or less and an elongation difference between the low-elongation filament and a low-elongation filament of 20% or more and a single elongation de of 5 de or more after stretch-cutting processing. Two types of filament yarns are produced. Next, the raw yarns 11 and 12 are combined to form a feed roller 13
After the drafting between the drafting roller 14 and the drafting roller 14, the air nozzle 15
It is tied up and taken over by the winder 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite yarn for reinforcing rubber or resin. More specifically, the present invention relates to a method for producing a long or short composite yarn for reinforcing a rubber or a resin, the sheath yarn of which is made of a short fiber and which has excellent adhesion to the rubber or the resin.

[0002]

BACKGROUND OF THE INVENTION Since polyester fibers have various excellent properties, they are widely used not only for clothing but also for general industrial materials. When the form is roughly divided into filaments and spun yarns (spans). You can

In the case of filaments, the strength utilization factor of fibers is generally high, and it is suitable for fields requiring strength. On the other hand, spun yarns (spans) are aggregates of short fibers, and therefore are more powerful than the former. However, since the yarn surface is complicated, it is suitable for a field requiring a surface effect, for example, a field requiring adhesiveness.

However, in the field of industrial material applications,
Polyester fibers are often woven and then used as a composite by attaching rubber or resin, and the composite yarn has the advantages of both filament and spun yarn, such as high strength and excellent adhesiveness, at low cost. If developed, its technical significance is extremely large.

Conventionally, as a yarn having such characteristics, there has been proposed a filament which is composed of a core yarn and a sheath yarn and is air-processed. However, this product has a problem in that the sheath yarn is easily aggregated and pops out on the yarn surface, so that the surface effect is insufficient and the effect of improving the adhesiveness is small.

On the other hand, various proposals have been made for developing a yarn having the advantages of both filament yarn and spun yarn. A typical example thereof is a composite core yarn thread in which a filament is used as a core thread and short fibers are wrapped around the core thread.

[0007]

However, in the conventional production of core yarns, it is necessary to enclose short fibers (spun fibers) in a filament yarn, and as a method thereof, multifilaments are opened and superposed with a draft short fiber bundle. There has been proposed a method of twisting and manufacturing, or a method in which a multifilament and a drafted short fiber bundle are combined and twisted to form a multifilament in a core portion and a short fiber in a sheath portion. However, in order to manufacture such yarns, it could not be a general-purpose product in the market due to the increase of production cost and the difficulty of production control.

The present invention is intended to solve the above-mentioned drawbacks of the prior art and to provide a rubber or resin-reinforced composite yarn having good adhesiveness and high strength.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, a multifilament having two different elongations is subjected to a drafting process to form a multifilament core, The present inventors have found that a core yarn composite yarn obtained by using a stretched chopped short fiber as a sheath has good adhesiveness and high tenacity as a rubber or resin reinforcing composite yarn.

That is, in the present invention, when a synthetic fiber multifilament yarn is used as a core yarn and a composite yarn for rubber or resin reinforcement made by mixing with short fibers is produced, the average elongation of the low elongation side multifilament yarn A is increased. Is 35% or less and the difference in the elongation from the high elongation side multifilament yarn B in which the single yarn de after processing is 5 de or more is 20% or more, and two types of multifilament yarns having different elongations are A method of producing a composite yarn for rubber or resin reinforcement, comprising obtaining a long-short composite yarn by performing a yarn twisting process.

The multifilament used in the present invention is not particularly limited, but polyester is preferable in terms of cost and versatility. Here, the polyester refers to one having terephthalic acid as a main acid component and at least one glycol, preferably an alkylene glycol selected from ethylene glycol, triethylene glycol and tetramethylene glycol as a main glycol component.

The composite yarn effective as a rubber or resin reinforcing yarn for the purpose of the present invention has a high elongation when it is considered that only the filaments forming the sheath portion are cut without cutting the multifilament of the core portion. The elongation difference between the filament and the low-elongation filament must be at least 20%. If it is less than this, the check-cutting process is bad and nep is generated, and the appearance after resin impregnation is not good. Further, it is necessary to set the elongation of the low elongation side multifilament to be 35% or less, and if it is 35% or more, the core-sheath structure of the composite yarn obtained by the stretch-cutting process does not go well, and it partially occurs. The core comes out on the surface and the adhesiveness deteriorates.

Further, in the high-elongation side multifilament which becomes the core yarn after the drafting process, the single yarn de needs to be 5 de or more after the processing. When the single yarn de is less than 5 de, the resulting composite is inferior in fatigue resistance during repeated use, which is not preferable.

The present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a spinning apparatus suitable for carrying out the present invention. In the figure, the filament 2 discharged from the spinneret 1 is cooled by a cooling air device 3. Next, the filament that has passed through the oil agent applying device 4 therebelow is drawn between the godet rollers 5 and 6, and is further heat-treated by the godet roller 6 and wound by the winder 7.

The raw yarn obtained by the above apparatus is subjected to drawing and random drafting of the filaments on the low elongation side in an ordinary drafting machine. The fluff by the low elongation side filament after cutting may remain protruding from the processed yarn,
It may be wound around the outer layer of the filament by an interlace or a tying nozzle such as a swirling flow nozzle.

FIG. 2 shows a schematic view of a drafting apparatus suitable for carrying out the present invention. Here, the raw yarns 11 and 12 obtained by the apparatus as shown in FIG. 1 are drafted between the feed roller 13 and the drafting roller 14, and then bound by the air nozzle 15 and taken up by the winder 16. ..

When the textured yarn thus obtained was used as a long or short composite yarn for rubber or resin reinforcement, high adhesiveness and strength were obtained.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples. Each evaluation item was as follows.

(Adhesiveness) A PVC resin-treated cloth was tested 500 times under a load of 3 kg using a Sukkoto anti-rubbing tester, and the degree of peeling at the interface between the resin and the woven cloth was observed and evaluated in 5 levels. did. ◎: No peeling ○: Almost no peeling △: Some peeling △ to ×: There is an adhesive portion but half peeling ×: Almost peeling

(Appearance) After processing the vinyl chloride resin, the surface of the cloth was visually observed and evaluated on a three-point scale based on the uniformity of resin adhesion and the presence or absence of pinholes. ◯: Good △: Some defects X: Many defects

(Toughness) The tear strength of the resin-treated cloth was measured, and three grades were evaluated using a spun yarn as a standard. ○: High △: Equivalent ×: Low

[0022]

Examples 1 to 3, Comparative Examples 1 to 4, Reference Examples 1 and 2 Polyethylene terephthalate (containing 0.3% of TiO ₂ as a matting agent) having an intrinsic viscosity of 0.80 for a core yarn is used for a sheath yarn. Polyethylene terephthalate having an intrinsic viscosity of 0.75 (containing 0.3% of TiO ₂ as a delusterant) is used as a known melt spinning direct drawing machine, and a take-up speed of spinning is 1200 m /
Melt spinning in minutes, adjusting the draw ratio so that the elongation after stretching is as shown in Table 1, and spinning conditions such that the low elongation yarn and the high elongation yarn after processing each have 500 denier / 96 filaments. It was set. The low elongation side raw yarn and the high elongation side raw yarn are combined at a ratio of 1: 1 and the elongation of the low elongation side raw yarn and the high elongation side raw yarn are processed by a check-cutting machine. Stretch cut processing was performed at an intermediate magnification.

A long and short composite yarn obtained by carrying out the drafting process is twisted at a twist number of 150 T / M and used as a warp and a weft to prepare a plain weave having a warp density of 25 warps / inch and 25 wefts / inch. did. Next, the obtained woven fabric was processed with a vinyl chloride resin to obtain a vinyl chloride resin-treated cloth. Table 1 shows the evaluation results of this product.
Shown in.

[0024]

[Table 1] From the results shown in Table 1, it is understood that the long-short composite core yarn obtained in the present invention is excellent as a resin-reinforcing composite yarn in strength, adhesiveness, and appearance after resin processing.

On the other hand, when the elongation on the low elongation side is 35% or more, it is considered that the core-sheath structure of the composite yarn obtained by the drafting process is not good, but the resin pinhole It can be seen that the adhesiveness deteriorates and the appearance also deteriorates. Further, when the difference in elongation is 20% or less, the drafting property is poor and nep is observed. Therefore, it can be seen that defects are likely to occur in the appearance after resin processing.

[0026]

Example 4 Polyethylene terephthalate having an intrinsic viscosity of 0.80 for core yarn (0.3% of TiO ₂ was used as a matting agent)
Polyethylene terephthalate having an intrinsic viscosity of 0.75 (containing 0.3% of TiO ₂ as a matting agent) for a sheath yarn using a known melt spinning direct drawing machine at a take-up speed of 1200 m / min. After the melt spinning, the low elongation side multifilament after stretching is 20% in elongation, 670 denier / 1
On the other hand, the multi-filament on the high elongation side has an elongation of 48% and 670 denier / 48, 9 so that it has 50 filaments.
It was set to be 6,144 filaments. The low elongation side raw yarn and the high elongation side raw yarn were combined at a ratio of 1: 1 and a check-cut process was performed at a ratio of 1.34.

The long-short composite yarn obtained by performing the drafting process is twisted at a twist number of 150 T / M and used as a warp and a weft,
A plain weave having a weave density of 25 warps / inch and weft of 25 stitches / inch was prepared. Next, the obtained woven fabric was resin-processed with a vinyl chloride resin to obtain a vinyl chloride resin-processed cloth, and the fatigue resistance was evaluated.

The fatigue resistance was evaluated by turning a piano wire on a work cloth, applying a load of 500 g, rubbing it 100 times, measuring the tear strength, and comparing it with the tear strength before rubbing to determine the strength retention rate. ..

The results are shown in Table 2.

[0030]

[Table 2]

As is clear from the results shown in Table 2, there is a strong correlation between the single yarn denier and the tenacity retention, and when the single yarn denier is less than 5 de, the tenacity retention is 90% or less and the fatigue resistance is poor. I understand.

[0032]

Industrial Applicability As described above, according to the present invention, a composite thread for rubber or resin adhesion, which is excellent in adhesiveness with a resin or the like, and which has a high strength and an excellent appearance, can be obtained. There is a remarkable effect that it can be supplied at a cost.

[Brief description of drawings]

FIG. 1 is a schematic view of a spinning device suitable for carrying out the present invention.

FIG. 2 is a schematic diagram of a drafting apparatus suitable for carrying out the present invention.

[Explanation of symbols]

 1 Spinneret 5 Godet Roller 6 Godet Roller 7 Winder 14 Checking Roller 15 Air Nozzle 16 Winder

Claims (1)

[Claims] 1. An average elongation of a low elongation side multifilament yarn A is 35% or less when a synthetic fiber multifilament yarn is used as a core yarn and a composite yarn for rubber or resin reinforcement mixed with short fibers is produced. And the processed single yarn de is 5
The long-short composite yarn is obtained by compounding two kinds of multifilament yarns having different elongations and having a difference in elongation of 20% or more from the high elongation side multifilament yarn B of de or more and performing a check-cut process. A method for producing a composite yarn for reinforcing rubber or resin, comprising: