JPS59168149A - Screen fabric for bias tire - 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 blind fabric for bias tires that does not cause misalignment, no weft breakage, and has excellent tenterability.

Currently, spun yarns such as cotton fibers and polynosic yarns are widely used as weft yarns for blind fabrics for bias tires.

The reason why cotton yarns are often used as weft yarns among such spun yarns is not clear, but it is believed that they are effective in preventing misalignment.

However, due to the low cutting elongation of cotton yarn, the weft yarn breaks during processing such as dipping, causing the warp cord to be disarranged.
This 20/1'S cotton yarn is one of the largest yarn counts among spun yarns, and from this point of view, blind fabrics using such cotton yarns may cause a decline in tire performance or be costly. It was disadvantageous to Furthermore, when weaving cotton threads as wefts on a loom specifically designed for blind fabrics, it is inevitable that fluff will be generated, and the generated fluff or cotton becomes hard when mixed with oil and mixed into the blind fabrics. In addition, the interior of the vehicle became dirty due to air lint or cotton dust, which was extremely problematic from a safety standpoint, and the interior of the vehicle had to be constantly cleaned. .

Despite these drawbacks, spun yarns such as cotton yarn are widely used as weft yarns in blind fabrics for bias tires.

As a result of intensive research into materials for weft threads that have a slip-preventing effect comparable to that of conventional spun yarns such as cotton threads, the present inventor found that multifilament yarns, which are drawn yarns with specific properties, were used as weft threads for blind fabrics for bias tires. The present invention was achieved based on the discovery that it is effective in preventing misalignment and has excellent one-tightening properties. Until now, there have been no examples of drawn yarns being used as weft yarns in bamboo blind fabrics, and they have only been used for comparative trials (Japanese Patent Laid-Open No. 52-124973).
However, even in this case, the tentering properties were poor. The present inventor has conducted sufficient research on this point, and as a result, has arrived at the present invention.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blind fabric for a bias tire, which is composed of weft and warp cords and has new performance in place of conventional spun yarns such as cotton yarn.

The present invention has the following configuration to achieve this object. That is, one aspect of the present invention is a blind fabric composed of one warp cord and one weft, in which the weft is heated at 200°C.
The melting point is less than 2, the static friction coefficient μS is 0.25 or more,
4.0-9. Retraction strength in the range of /d r/
d), breaking elongation (ch) of 12-49%.

Shrinkage stress at 150℃ x 15 minutes is 0.69/d
This is a blind fabric for bias tires characterized by being made of drawn synthetic fiber yarn as shown below.

The present invention will be explained in detail below. The thickness of the warp cord used in the present invention is usually 1,000 denier or more6.
It is 500 denier or less.

If it is less than 1,000 denier, the reinforcement for bias tires becomes weak and problems tend to occur, while if it exceeds 6,500 denier, there will be too much space between warp cords, causing functional problems as a bias tire reinforcing material. next,
The weft used in blind textiles has a melting point of 200°C or higher,
Static friction coefficient μS of 0.25 or more, 4.0 to 9. Of
Tensile strength in the range of / d and elongation at break (%) of f/dL 12-49 inches.

Shrinkage stress at 150°C x 15 minutes is 0.6 r/
It is necessary that the yarn be made of a drawn synthetic fiber having a fiber diameter of d or less. The static friction coefficient μs of the drawn synthetic fiber yarn is 0.25 or more, preferably 0.30 or more.

This has a very important meaning in the present invention,
The presence of such requirements prevents misalignment. If the static friction coefficient μs is less than 0.25, it will not be effective in preventing misalignment. Needless to say, this static friction coefficient μs Vim is the difference between the fibers, the fiber opening and the fibers. In addition, the static friction coefficient μ
The measurement of s was carried out using a radar set friction coefficient testing machine (manufactured by Aoi Seiki). The measurement method is as follows. First, 80 samples were mounted parallel to the surface of a drum-shaped cylinder at equal intervals along its axial direction with an initial load of 5-weight (displayed fineness (d) in 200 hr), and then 80 m1 samples were mounted at right angles to the above-mentioned samples. hanging it along the periphery of the cylinder over the cylindrical sample in the direction,
-Apply a load of 100~ to one end and hang it on a torsion balance hook.

After that, rotate the cylindrical sample (yarn) to the torsion balance at 8 rpm, and rotate the arm so that the secondary needle always points to 0. 9) Indulge (up to integer digits).

Thereafter, the same operation is performed from the beginning to read the scale (~), and the average of the five scale marks (~) is taken as the torsion balance reading m (~), and the static friction coefficient μS=0.733. The outer diameter of the drum-shaped cylinder was 1611111φ, the length of the cylinder was 25 mm, and the circumferential speed of the cylinder was 408/min.

Further, the melting point is 200°C or higher in order to withstand heat treatment such as dipping, and preferably 215°C or higher.

In order to raise this melting point, it is preferable to set the intrinsic viscosity to 0.60 or higher in the case of polyester thread fibers, and to set the relative viscosity to 2.6 in the case of polyamide thread fibers.
It is preferable to do the following. The measurement of this melting point is
By differential thermal analysis.

Furthermore, the tensile strength r/d) is 4.0 to 9.0 f/d.
To ensure that the cutting elongation (%) is in the range of 12 to 49%, heat 9B such as dipping! This is to prevent the weft from being cut by the process.

It is also used to improve tenterability, and is related to the above-mentioned melting point.

Furthermore, if the cutting elongation is less than 12%, the weft threads will not stretch, resulting in poor tenterability and the weft threads will be likely to break, while if it exceeds 49%, mesh misalignment will occur more easily. In addition, the strength and elongation.

A strength and elongation curve was drawn and read using a constant speed extension type tensile testing machine (Tensilon manufactured by Toyo Baldwin).

In addition, the shrinkage stress (r
/d) 75f0.6 f/d or less, preferably 0.
The reason for setting it to 4 f/d or less and 0.1 f/d or more is to improve the tenting property. If it exceeds 0.6 f/d, the tenting performance will deteriorate.

The stress that develops after being left in an oven at 150°C for 15 minutes is read using a strain gauge.0 In this regard, the dry heat shrinkage rate at 150°C for 30 minutes should be kept within 2 to 15%. preferable. Note that the load is assumed to be no load.

In addition, the reason why the present invention intentionally takes up the drawn yarn of synthetic fibers is that the drawn yarn generally prevents slippage.

On the contrary, the specific performance of drawn yarn prevents misalignment, improves exportability, etc., and reduces costs because it does not have to be made into staple fiber. This is because they have found that it leads to improved tire performance. Any synthetic fiber may be used as long as it satisfies this performance. Examples include: 1. Consisting essentially of conventional polyester polymers 5. homopolymers or copolymers, such as polyethylene terephthalate, polybutylene terephthalate, etc.

Preferred examples include polyamide yarn fibers such as nylon 66 and nylon 6. Particularly preferred are polyester thread fibers and polyamide fibers from the above-mentioned performance.

Note that these drawn yarns are preferably multifilament yarns having a fineness of 40 to 250 d. 40d
If it is less than 250 d, it becomes unfavorable in terms of strength, and if it exceeds 250 d, the warp cord will deteriorate due to abrasion.Furthermore, the single yarn fineness of the multifilament yarn is 10.
d or less is preferable. This is because if the length exceeds 10 d, it will become hard and impede weavability. More preferably 1
Multifilament yarns with a twist number of 0 to 30 T/M are preferred. This is because if it is less than IOT/M, the weft threads tend to come apart, and if it exceeds 30 T/M, the static friction coefficient μs becomes small.

As described above, according to the present invention, it is possible to obtain a blind fabric for bias tires that does not cause misalignment or problems with heat treatment and has excellent tenting properties, and this blind fabric improves the performance of bias tires. Two.

In addition, in manufacturing this blind fabric for bias tires, remarkable effects are achieved in terms of indoor environment, safety, cost, and quality. Also.

Since a denier of 1/2 to 1/3 of that of conventional cotton yarn is sufficient, the amount of weft yarn that would otherwise be unnecessary can be reduced, resulting in significant economic and tire performance effects.

Example C-caprolactam was polymerized using a conventional method.

The relative viscosity at 20°C in a sulfuric acid water bath of 96% by weight is 2.6.
Nylon 6 was produced and melted at 270°C.

It was melt-spun from a spinneret with a diameter of 0.3 M and 24 holes, applied with a finishing oil while cooling, and wound up at a spinning speed of 1200 m/min. The obtained undrawn yarn was stretched 3.4 times, and then subjected to a relaxation treatment by being run in contact with a hot plate at 100° C. with 10% overfeed.

This drawn yarn (70 denier/24 filaments) has 2
Melting point of 24°C, static rub coefficient of 0.35, 5. Or/d tensile strength, 45% cutting elongation, 150°C (dry heat) x 15
It had a shrinkage stress of 0.3 y/d in minutes.

10- This drawn yarn is used as a weft yarn, and the number of first twists is 32T/10cm.
Two twisted yarns of 0 denier (4200 denier,
A welt fabric was woven using a heavy fabric loom using a warp coat with a twist count of 32 T/10 tfi. This blind fabric has a warp cord density of 40 15c1n and a weft density of 3.5.
/5 crn density. For comparison, weaving fabrics were woven with the same warp cord and polyester drawn yarn (75 denier/24 filament) drawn 13.5 times as much as cotton yarn (75 denier/24 filament) for the weft with the same warp cord and the same density as above. .

The drawn yarn of the present invention is subjected to relaxation treatment as described above in order to reduce shrinkage stress.

Further, in order to increase the coefficient of static friction, 30% bisphenol thread oil was added to the yarn for spinning.

The obtained blind fabric was immersed in resorcinol-formalin-latex (RFL), a common adhesive treatment agent for nylon, and then continuously heated in a hot air circulation heat treatment apparatus (ZEL).
(manufactured by L.L.).

Heat treatment conditions: Yarn running speed 100m/min Dry heat set Normalize zone Zone hot air temperature ('C) 130 210 210 Nutretsch (%) 3 4 0
Processing time (seconds) 75 45 45 The table below shows the results of comparing the three types of blind fabrics with respect to misalignment during weaving and after heat treatment, weft cutting during heat treatment, deformation of the blind fabric, and width extension property. Indicated.

As is clear from the table, in the case of the present invention, there was no misalignment and processability and spreadability were good, probably because drawn yarn with a high coefficient of static friction and low shrinkage stress was used as the weft yarn. However, many occurrences were observed near the joint of the cotton yarn in the comparative example. Similarly, in the case of a yarn drawn 3.5 times as much as that of the comparative example, misalignment was observed here and there, and the drawing property was also poor.

As described above, the present invention has been shown to be so effective as to break the concept that conventionally it was thought that it was impossible in practical use to use drawn yarns as weft yarns.

Patent applicant: Toyobo Co., Ltd. 13-

Claims (1)

[Scope of Claims] 1. In a blind fabric composed of a warp cord and a weft, the wire has a melting point of 200° C. or higher, a static friction coefficient μS of 0.25 or higher, and 4.0 to 9. Tensile strength in the range of Of/d (f/d), cutting elongation (%) in the range of 12 to 49 inches,
Shrinkage stress at 150°C for 15 minutes is 0.6 f/
1. A blind fabric for Novei tires, characterized in that it is made of drawn yarns of synthetic fibers having a diameter of d or less. 2. The blind fabric for a bias tire according to claim 1, wherein the drawn yarn is a multifilament yarn having a fineness of 40 to 250 d. 3. Claim 1 or 2, wherein the drawn yarn is a multifilament yarn composed of a single yarn fineness of 10 d or less
A blind fabric for bias tires as described in 2. 4. The blind fabric for bias tires according to claim 1, 2, or 3, wherein the drawn yarn is a multifilament yarn having a twist number of 10 to 30 T/M.