KR102166034B1 - Seat belt webbing for car having lightweight and improved abrasion resistance - Google Patents

Abstract

The automobile seat belt webbing according to the present invention has a tensile strength of 12 to 17 g/d and a fineness of 600 to 1500 denier inclined polyethylene yarn; And polyester woven yarn is woven as a weft, the tensile strength may be 2,700 ~ 3,200kgf.

Description

Seat belt webbing for cars with improved light weight and wear resistance {SEAT BELT WEBBING FOR CAR HAVING LIGHTWEIGHT AND IMPROVED ABRASION RESISTANCE}

The present invention relates to a seat belt webbing for automobiles with improved wear resistance and lighter weight.

Currently, high-strength polyester fibers containing polyethylene terephthalate as a main component are widely used as yarns for seat belts. Since the yarn for the seat belt basically serves to reduce secondary damage by fixing a person to the vehicle body during a vehicle accident for the most important passenger protection, maintaining the strength of the yarn is particularly important. However, in the case of using a polyester fiber of such a high modulus low-strength type as a yarn for a seat belt, there is a problem of injuring a passenger during a vehicle collision due to the rigidity of the seat belt itself.

On the other hand, in general, since the polyester yarn for seat belts is not colored, dyeing processing is required after weaving. Therefore, although an emulsion containing a leveling agent is added during the manufacture of polyester yarn, the oil agent is removed during the dyeing process. To give lubricity again, it is necessary to perform resin processing again after dyeing to impart lubricity. Various problems have emerged, such as inconvenience in the process and unfavorable in terms of economy, as well as causing environmental pollution due to wastewater from the dyeing process.

In addition, in order to make the seat belt webbing lighter than the present, it is necessary to increase the strength of the yarn to reduce the number of warp yarns used for weaving, but if the strength of the polyester yarn is increased to 9.0g/d or more, fluff generation increases and the appearance is poor. Therefore, there is a problem in that it is difficult to reduce the weight of the seat belt webbing by applying these yarns, particularly to be less than 50 g/m.

In addition, since it is difficult to increase the strength retention to more than 85% after an abrasion test due to the material characteristics of the polyester yarn currently used for manufacturing seat belt webbing, other materials having superior abrasion properties than polyester yarn must be applied to the slope of the seat belt webbing. do.

Accordingly, there is a need for a study on the development of fibers that are used for seat belts and the like, which can improve wear resistance and reduce the weight of seat belts while maintaining excellent mechanical properties and high strength.

An object of the present invention is to provide a seat belt webbing for automobiles with improved abrasion resistance and lighter weight while maintaining tensile strength by using a polyethylene yarn with a slope.

The automobile seat belt webbing according to an embodiment of the present invention has a tensile strength of 12 to 17 g/d and a fineness of 600 to 1500 denier inclined polyethylene yarn; And polyester woven yarn is woven as a weft, the tensile strength may be 2,700 ~ 3,200kgf.

In this case, the single yarn fineness of the polyethylene raw yarn may be 1.5 to 9.0 denier.

In addition, the polyethylene raw yarn may contain 2 to 5% by weight of a master batch chip including carbon black based on the total weight of the raw yarn.

In addition, the automobile seat belt webbing may have a weight of 35 to 45 g/m.

In addition, the automobile seat belt webbing may have a tensile strength retention rate of 85 to 95% after an abrasion test according to the KS R 4027 standard.

According to an embodiment of the present invention, the automobile seat belt webbing includes a polyethylene yarn at a slope, so that the tensile strength retention rate after the abrasion test is improved due to the excellent wear resistance properties of the polyethylene resin, thereby improving abrasion resistance.

In addition, although the tensile strength of the seat belt webbing is improved by more than equivalent compared to the prior art, the weight can be reduced. In addition, by weaving using raw yarn, there is an advantage that a separate dyeing process is not required after weaving.

In the present invention, various modifications may be made and various forms may be applied, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each drawing, similar reference numerals have been used for similar elements. In the accompanying drawings, the dimensions of the structures are shown to be enlarged than actual for clarity of the present invention. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility of being added. Further, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where the other part is "directly above", but also the case where there is another part in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is said to be "under" another part, this includes not only the case where the other part is "directly below", but also the case where there is another part in the middle. In addition, in the present application, the term "above" may include a case where it is disposed not only above but also below.

Hereinafter, an embodiment of the present invention will be described in more detail.

Seat belt webbing for a vehicle according to an embodiment inclined polyethylene raw yarn; And polyester woven yarn may be woven as a weft.

The automobile seat belt webbing of the present invention includes a polyethylene yarn at an incline, so that the tensile strength retention rate after the abrasion test is improved due to the excellent abrasion resistance of the polyethylene resin, thereby improving abrasion resistance. In addition, although the tensile strength of the seat belt webbing is improved by more than equivalent compared to the prior art, the weight can be reduced.

At this time, the polyethylene raw yarn may be prepared by mixing and melting polyethylene chips and coloring master batch chips and extruding them while passing through a nozzle. Hereinafter, a method of manufacturing a polyethylene raw yarn will be described in detail.

Polyethylene is preferably a high-density polyethylene (HDPE) having a high crystallinity and a density of 0.95 or higher. In addition, polyethylene preferably has a weight average molecular weight (Mw) of 100,000 or more, and a ratio of a weight average molecular weight to a number average molecular weight (Mw/Mn) of 2.0 to 3.0, but is not limited thereto.

Meanwhile, examples of the dye usable for the master batch chip may be inorganic dyes such as carbon black or organic dyes, but it is preferable to use carbon black.

At this time, the average particle diameter of the carbon black particles may be 10 to 25 nm, but is not limited thereto. When the average particle diameter of the carbon black particles is less than 10 nm, the dispersibility decreases, resulting in a low yield in the master batch manufacturing process, and there is no uniform dispersion, which may cause a problem in which the color of the manufactured raw yarn is uneven. In addition, when the average particle diameter of the carbon black particles exceeds 25 nm, a lot of thread trimming may occur when manufacturing the raw yarn.

In addition, the organic dye is not particularly limited, but may be one or more selected from the group consisting of monoazo-based, disazo-based, anthraquinone-based, triarylmethane-based, and azine-based.

These dyes may be 1 to 40% by weight, and preferably 10 to 30% by weight, based on the total weight of the master batch chip. If the content of the dye is less than 1% by weight, a large amount of master batch chips must be added to obtain the desired blackness, so it is disadvantageous to develop the strength of the original yarn and causes a problem of increasing the cost of dyeing, and the content of the dye exceeds 40% by weight. In this case, it is difficult to manufacture a master batch chip, and it is difficult to ensure uniform dispersibility.

In addition, such a master batch chip is preferably included in 1 to 8% by weight based on the total weight of the final fabricated yarn, more preferably 2 to 5% by weight may be included. When the content of the master batch chip in the woven yarn is less than 2% by weight, it is difficult to develop sufficient blackness of the woven yarn, and when it exceeds 5% by weight, the threading is increased during spinning, resulting in a decrease in spinning operability.

The polyethylene chip and the master batch chip as described above may be mixed and melted and extruded while passing through a nozzle to prepare a discharge yarn. Here, the spinning temperature is preferably 220 to 270°C, and if the spinning temperature is less than 220°C, the melting temperature is low, which may lead to a problem of non-uniformity, and if the spinning temperature exceeds 270°C, pyrolysis of the polyethylene melt is accelerated. As a result, it may be difficult to express physical properties at the target level.

Thereafter, the discharged sand is rapidly cooled and solidified by passing through the cooling zone. At this time, if necessary, a heating device of a certain length may be installed in the distance from the nozzle to the starting point of the cooling zone, that is, in the length section of the hood.

The section in which the heating device is installed is referred to as a delayed cooling zone or a heating zone, and the zone is preferably 200 to 400 mm, but is not limited thereto.

Meanwhile, in the cooling zone, depending on the method of blowing cooling air, open quenching, circular closed quenching, radial outflow quenching, radial inflow quenching, etc. May be applied, but is not limited thereto.

In this case, the temperature of the cooling air injected for rapid cooling in the cooling zone may be adjusted to 20 to 50°C. Rapid cooling using such a sharp temperature difference between the hood and the cooling zone can increase the solidification point and spinning tension of the spun polymer, thereby increasing the orientation of the undrawn yarn and the formation of a linking chain between the crystal and the crystal.

Thereafter, the discharged yarn solidified while passing through the cooling zone can be oiled at 0.5 to 2.0% by weight with respect to the discharged yarn by an oil agent applying an oil agent having excellent stretchability and thermal efficiency while reducing the coefficient of friction between single yarns.

Undrawn yarn can be formed by spinning the oiled yarn. Thereafter, the undrawn yarn may be stretched in multiple stages by passing it through a stretching roller to manufacture a yarn.

The first-stage stretching roller temperature is higher than the glass transition temperature of the undrawn yarn and lower than 40°C, but the temperature of the last stretching roller is preferably 100 to 150°C.

If the temperature of the last drawing roller is less than 100°C, the crystallinity and the size of the crystal cannot be increased in the drawing process, and thus the strength and thermal stability of the yarn cannot be expressed, resulting in a decrease in dimensional stability at high temperatures, and the temperature of the last drawing roller exceeds 150°C. If it is too close to the melting point, the microstructure of the yarn becomes uneven, such as crystal decomposition, and thus the strength of the yarn may decrease.

In addition, it is preferable that the total draw ratio of the formed yarn is 10.0 to 20.0. If the draw ratio is less than 10.0, the productivity decreases and the strength of the yarn decreases. If the draw ratio exceeds 20.0, the crystallization of the oriented non-hardened part increases, resulting in a decrease in drawing workability and threading, and amorphous part in the microstructure of the yarn. Since the molecular chain of is broken, the uniformity of the molecular chain is lowered, and the strong utilization rate may decrease, which is not preferable.

The prepared polyethylene raw yarn may have a tensile strength of 12 to 17 g/d, preferably 13 to 16 g/d, and more preferably 13 to 15 g/d. At this time, when the tensile strength of the polyethylene raw yarn is less than the above range, the stability of the seat belt webbing may decrease, and when it exceeds the above range, productivity may decrease.

In addition, the fineness of the polyethylene raw yarn may be 600-1,500 denier, preferably 800-1,200 denier, more preferably 900-1,100 denier. In addition, the single yarn fineness of the polyethylene raw yarn may be 1.5 to 9.0 denier, preferably 5.0 to 9.0 denier, more preferably 7.0 to 9.0 denier. At this time, when the fineness of the polyethylene raw yarn and the single yarn are respectively less than the above ranges, the stability of the seat belt webbing may be deteriorated, and when it exceeds the above range, the fit of the seat belt webbing may be poor.

On the other hand, the polyester yarn yarn used as the weft can be prepared by mixing and melting polyethylene terephthalate (PET) chips and coloring master batch chips having an intrinsic viscosity of 1.0 or more and extruding them while passing through a nozzle. Hereinafter, a method of manufacturing a polyester fiber will be described in detail. Here, the coloring master batch chip is the same as described above, and redundant descriptions will be omitted.

The polyethylene terephthalate polymer may contain at least 85 mol% or more of ethylene terephthalate units, but may optionally contain only ethylene terephthalate units. In this case, polyethylene terephthalate is described as an example of polyester, but is not limited thereto.

In addition, the polyethylene terephthalate may optionally include a small amount of units derived from ethylene glycol and terephthalene dicarboxylic acid or derivatives thereof, and one or more ester-forming components as a copolymer unit. Examples of other ester-forming components that can be copolymerized with polyethylene terephthalate units include glycols such as 1,3-propanediol, 1,4-butanediol, 1,6-hexadiol, terephthalic acid, isophthalic acid, hexahydroterephthalic acid, and stilbendica Dicarboxylic acids such as carboxylic acid, bibenzoic acid, adipic acid, sebacic acid, and azelaic acid may be included, but the present invention is not limited thereto.

Terephthalic acid (TPA) and ethylene glycol raw materials are melt-mixed in a ratio of 2.0 to 2.3 in polyethylene terephthalate chips prepared using the polyethylene terephthalate polymer as described above, and the melt mixture becomes transesterification and condensation polymerization. It can be formed as a raw chip.

Thereafter, the low chip may be solid-phase polymerization to have an intrinsic viscosity of 1.0 to 1.15 under a temperature of 240 to 260°C and vacuum. Here, when the intrinsic viscosity of the raw chip is less than 1.0, the intrinsic viscosity of the final drawn yarn is lowered, and high strength cannot be exhibited after heat treatment. On the other hand, when the intrinsic viscosity of the low chip exceeds 1.15, the spinning tension is excessively increased, and the cross section of the radiating yarn becomes uneven, resulting in a problem that many filaments are cut during stretching, resulting in poor stretching workability.

In addition, in the condensation polymerization reaction, an antimony compound, which is a polymerization catalyst, may be optionally used, and antimony trioxide may be preferably used. For this reason, it can be added so that the residual amount of antimony metal in the final polymer is 180 to 300 ppm. At this time, when the residual amount of antimony metal is less than 180 ppm, the polymerization reaction rate may be slowed, resulting in a decrease in polymerization efficiency, and when the residual amount exceeds 300 ppm, more than necessary antimony metal acts as a foreign material, resulting in deterioration of spinning and stretching workability.

The polyethylene terephthalate chip as described above may be melted and extruded while passing through a nozzle to prepare a discharge yarn. Thereafter, the discharged sand is rapidly cooled and solidified by passing through the cooling zone. At this time, if necessary, a heating device of a certain length may be installed in the distance from the nozzle to the starting point of the cooling zone, that is, in the length section of the hood.

The section in which the heating device is installed is called a delayed cooling zone or a heating zone, and the zone preferably has a length of 50 to 250 mm and a temperature of 250 to 400°C (air contact surface temperature), but is not limited thereto.

On the other hand, in the cooling zone, open quenching, circular closed quenching, radial outflow quenching, radial inflow quenching, etc., according to the method of blowing cooling air. May be applied, but is not limited thereto.

In this case, the temperature of the cooling air injected for rapid cooling in the cooling zone may be adjusted to 20 to 50°C. Rapid cooling using such a sharp temperature difference between the hood and the cooling zone can increase the solidification point and spinning tension of the spun polymer, thereby increasing the orientation of the undrawn yarn and the formation of a linking chain between the crystal and the crystal.

Thereafter, the discharged yarn solidified while passing through the cooling zone can be oiled at 0.5 to 1.2% by weight of the discharged yarn by an oil agent applying an oil agent having excellent stretchability and thermal efficiency while reducing the coefficient of friction between the single yarns.

Undrawn yarn can be formed by spinning the oiled yarn. At this time, the spinning draft is 1500 to 1800, the spinning speed is preferably 3,000 to 3,200 m/min, and when spinning at the spinning draft and spinning speed in the above range, excellent strength of the yarn can be secured even at a low draw ratio.

If the spinning draft is less than 1500 or the spinning speed is less than 3,000 m/min, the cross-sectional uniformity of the yarn deteriorates and the drawing workability decreases, and the degree of orientation of the undrawn yarn decreases to decrease the degree of crystallinity and the crystal part does not develop. In this case, the thermal stability is lowered and the strength is lowered, and when high elongation is performed to improve strength and modulus, the shape stability may be lowered. In addition, when the spinning speed exceeds 3,200 m/min, the stretchability of the undrawn yarn is reduced, so that the strength and the stretching workability of the yarn may be reduced.

Thereafter, the undrawn yarn may be stretched in multiple stages by passing it through a stretching roller to manufacture a yarn.

Yarn can be formed by stretching the yarn that has passed through the first stretching roller while passing through a series of stretching rollers using a spin draw method.

In the stretching process, the undrawn yarn may be multi-stage stretched, and each stretching roller temperature is higher than the glass transition temperature of the undrawn yarn and lower than 95°C, but the temperature of the last stretching roller is preferably 200 to 250°C.

If the temperature of the last drawing roller is less than 200°C, the crystallinity and the size of the crystal cannot be increased in the drawing process, and thus the strength and thermal stability of the yarn cannot be expressed, resulting in a decrease in shape stability at high temperatures, and the temperature of the last drawing roller exceeds 250°C. If it is too close to the melting point, the microstructure of the yarn becomes uneven, such as crystal decomposition, and thus the strength of the yarn may decrease.

In addition, it is preferable that the total draw ratio of the formed yarn is 4.0 to 7.0. If the draw ratio is less than 4.0, the productivity decreases and the strength of the yarn decreases, and if the draw ratio exceeds 7.0, the crystallization of the oriented non-hardened part increases, resulting in a decrease in drawing workability and trimming, and amorphous part in the microstructure of the yarn. Since the molecular chain of is broken, the uniformity of the molecular chain is lowered, and the strong utilization rate may decrease, which is not preferable.

Then, it is possible to manufacture a seat belt webbing by weaving the polyethylene yarn prepared as described above as a ramp and the polyester yarn yarn as a weft.

The seat belt webbing according to the present invention may be manufactured with a weaving density of 220 threads / 5 cm to 300 pieces / 5 cm warp and 3 pieces / cm to 9 pieces / cm of weft. Here, the warp density may be preferably 290 copies/5cm or less, or 280 copies/5cm or less, and 275 copies/5cm or less. The warp density may be 220 sheets/5cm or more in terms of fabric thickness, and 300 sheets/5cm or less in economic terms. In addition, the weft density may be 3 threads/cm to 9 threads/cm, preferably 4 threads/cm to 8 threads/cm. The seat belt of the present invention can secure excellent mechanical properties of high strength as described above even in such an optimized low weaving density range.

Meanwhile, according to another embodiment of the present invention, a method of manufacturing a seat belt as described above is provided.

The seat belt of the present invention can be manufactured by weaving and processing a seat belt using the above-described polyethylene yarn and polyester yarn as warp and weft, respectively. The seat belt or the like may be manufactured using a conventional narrow loom, and is not limited to using any specific loom. Usually, it can be woven using a Muller loom as a Twill structure.

The manufactured seat belt webbing uses polyethylene yarn with a tensile strength of 12 to 17 g/d, so that the tensile strength of the seat belt webbing is improved to 2,700 to 3,200 kgf, and the weight is 35 to 45 g/m, which is lighter than the conventional one. Can be. At this time, when the tensile strength and weight of the seat belt webbing are respectively less than the above ranges, the stability of the seat belt webbing may be deteriorated, and when each exceeds the above range, productivity may decrease. In addition, due to the excellent abrasion resistance of the polyethylene resin, after abrasion test according to the KS R 4027 standard, the tensile strength retention rate of the seat belt webbing may be 85 to 95%, thereby improving abrasion resistance.

As a result, the seat belt webbing manufactured as described above is not only improved in tensile strength and abrasion resistance, but also is lightweight, and thus can be usefully applied for automobiles.

Hereinafter, the present invention will be described in detail through examples. However, the following examples are only illustrative of the present invention, and the present invention is not limited by the following examples.

[Example 1]

A polyethylene resin having a weight average molecular weight (Mw) of 150,000 and a weight average molecular weight to number average molecular weight ratio (Mw/Mn) of 2.5 was used at a ratio of 96% by weight, and 10% by weight of carbon black based on the same polyethylene resin. The color master batch prepared in the content was mixed at a ratio of 4.0% by weight, and melt extrusion was performed at a rate of 330 g/min of discharge through a 120 hole spinning nozzle at a melting temperature of 250°C. Thereafter, after passing through the warming section of 30 cm, it was cooled under air pressure conditions of 20° C. and 0.6 m/sec, and wound at a speed of 200 m/min to prepare undrawn yarn.

Thereafter, the undrawn yarn was stretched in two stages using several Nelson rolls capable of controlling the temperature. The first-stage stretching is stretched on a 25℃ roller at a draw ratio of 3.5, and the second-stage stretching is stretched on a 130℃ roller at a draw ratio of 4.5, so that the single yarn fineness is 7.9 denier, the total fineness is 950 denier, and the yarn strength is 13.5g/denier. Black raw yarn was prepared.

Using the manufactured polyethylene yarn as a warp, setting the number of warp yarns to 270, and using a seat belt weaving machine (Jakob Muller AG, model NG 28 G), using a 2up, 2down Twill structure, a 48mm width webbing at a weaving speed of 1500rpm Was weaved.

At this time, the weft used was woven using a 515-SB type (Hyosung Co., Ltd.) 500 denier 96 filament yarn type black woven polyester yarn at a density of 6.6 pieces per 1 cm, and catch yarn and edge yarn One each of 506-SB type (Hyosung Co., Ltd.) 500 denier 48 filament black original polyester yarn was used.

[Example 2]

A polyethylene resin having a weight average molecular weight (Mw) of 150,000 and a weight average molecular weight to number average molecular weight ratio (Mw/Mn) of 2.5 was used at a ratio of 96% by weight, and 10% by weight of carbon black based on the same polyethylene resin. The color master batch prepared by the content was mixed at a rate of 4.0% by weight, and melt extrusion was performed at a rate of 370 g/min of discharge through a 144 hole spinning nozzle at a melting temperature of 250°C. Thereafter, after passing through the warming section of 30 cm, it was cooled under air pressure conditions of 20° C. and 0.6 m/sec, and wound at a speed of 200 m/min to prepare undrawn yarn.

Thereafter, the undrawn yarn was stretched in two stages using several Nelson rolls capable of controlling the temperature. The first-stage stretching is stretched on a 25℃ roller at a draw ratio of 3.5, and the second-stage stretching is stretched on a 130℃ roller at a draw ratio of 4.5, so that the single yarn fineness is 7.3 denier, the total fineness is 1,050 denier, and the yarn strength is 13.5g/denier. Black raw yarn was prepared.

Using the manufactured polyethylene yarn as a warp, setting the number of warp yarns to 260 yarns, using a seat belt weaving machine (Jakob Muller AG, model NG 28 G), using a 2up, 2down Twill structure, 48mm wide webbing at a weaving speed of 1500rpm Was weaved.

At this time, the weft used was woven using a 515-SB type (Hyosung Co., Ltd.) 500 denier 96 filament yarn type black woven polyester yarn at a density of 6.6 pieces per 1 cm, and catch yarn and edge yarn One each of 506-SB type (Hyosung Co., Ltd.) 500 denier 48 filament black original polyester yarn was used.

[Comparative Example 1]

The same procedure as in Example 1 was used, except that 514-SB type (Hyosung Co., Ltd.), 1500 denier 192 filament yarn strength was 8.0 g/denier 270 polyester black yarn yarn as a slope instead of polyethylene yarn yarn. Seat belt webbing was woven through.

[Experimental Example]

The tensile strength, strength retention rate and weight of the seat belt webbing prepared in Examples 1 and 2 and Comparative Example 1 were measured after the wear test, respectively, and the results are shown in Table 1 below.

At this time, the tensile strength was measured by the KS R 4027 method. In addition, the strength retention rate after the abrasion test was calculated as the retention rate for the tensile strength before the abrasion test by measuring the tensile strength after the wear test (2,500 times, 2.35kg load condition) of the hexagonal rod of the KS R 4027 method.

Example 1 Example 2 Comparative Example 1 Tensile strength (kgf) 2,874 3,060 2,725 Strong retention rate after abrasion test (%) 91.4 90.6 83.3 Unit weight (g/m) 36.9 38.9 54.9

Referring to Table 1, in the case of Comparative Example 1 using polyester black yarn as a warp, the tensile strength was at the level of 2,725 kgf, the strength retention rate after the wear test was at the level of 83.3%, and the weight was 54.9 g/m. On the other hand, the seat belt webbing manufactured according to the Examples included polyethylene yarn as a slope, so that the strength retention rate after the abrasion test was significantly improved compared to the Comparative Example, and the tensile strength was also improved by more than equivalent compared to the Comparative Example, but the weight was reduced. I can see that it was done.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art or those of ordinary skill in the art will not depart from the spirit and scope of the present invention described in the claims to be described later. It will be understood that various modifications and changes can be made to the present invention within the scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the content described in the detailed description of the specification, but should be determined by the claims.

Claims (5)

Inclined polyethylene raw yarn including high-density polyethylene having a density of 0.95 or more, a weight average molecular weight of 100,000 or more, and a ratio of a weight average molecular weight to a number average molecular weight of 2.0 to 3.0; And polyester raw yarn is woven as a weft,
The polyethylene yarn has a tensile strength of 13 to 16 g/d, a total fineness of 900 to 1,100 denier, a single yarn fineness of 5.0 to 9.0 denier, and a master batch chip containing carbon black is 2 to 5 based on the total weight of the yarn. Contains wt%,
Seat belt webbing for automobiles with a tensile strength of 2,874~3,060kgf, a weight of 35~45g/m, and a tensile strength retention of 85~95% after abrasion test according to KS R 4027 standards.
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