KR20050098664A - Inflatable two-layer fabrics - Google Patents

Abstract

The present invention relates to a double fabric having air component properties by gas, and more particularly, two fabric layers separated from each other, which are woven at the same time using a loom, and a connection part of the two fabric layers separated from each other. A double woven fabric having air component properties, wherein the texture of the fastening portion comprises 2/2 basket weaving, runner weaving, double weaving weaving, or at least one mixed weaving thereof, joined by at least 13 or more yarns. It provides a double fabric having air component properties.

The fabric having the air-particulate by the gas of the present invention is composed of at least 13 or more yarns, which makes the joints very firm during air expansion so that the air escapes from the inside of the bag when the layered part is expanded by air. The manufacturing cost can be reduced by simplifying the manufacturing process at the time of manufacturing impact shock final products such as airbags by omitting the sewing process in the weaving step, and the weaving property is excellent and the surface is smooth so that the coating of synthetic resin is easy. Thus, it can be usefully used in the manufacture of vehicle airbags, life jackets, shock absorbers.

Description

Double fabric with air component by gas {INFLATABLE TWO-LAYER FABRICS}

[Technical Field]

The present invention relates to a double fabric having air component properties by gas, and more particularly, to a double fabric having air component properties excellent in utility in a vehicle airbag or a life jacket.

[Private Technology]

Fabrics with parts can be used for automotive airbags, life vests, and the like. In particular, if the vehicle rolls over, the side curtain type airbag that the curtain-type airbag is unfolded in the side window of the vehicle in order to prevent the head of the driver or passenger from being injured by the window or side structure of the vehicle In this regard, the airbag must be inflated for at least five seconds while the car is rolling to protect the passengers safely in an accident, in which case fabrics with parts are useful.

The method of manufacturing a product having air component characteristics such as a vehicle air bag is to use two fabrics by sewing, fusion or bonding, and to use a double fabric in which two layers of fabrics are partially joined by a connection point. It is divided into methods.

However, as in the first method, a method of manufacturing an air-part product by sewing two fabrics, fusing them by heat or ultrasonication, or bonding them with an adhesive is performed by manufacturing a separate fabric after fabricating two layers of fabric. A process, a fusion process, or an adhesion process is required, resulting in a complicated process and an increase in manufacturing cost.

In order to solve this problem, in recent years, a method of manufacturing an air part product such as an air bag using a double fabric having a second air part property has been attempted.

Fabrics with component parts by air, such as air, have a junction between the two separate layers and the two layers. A fabric having a system closed by a junction point serves to firmly bind the two layers when each single layer expands rapidly by air or the like, and there should be no outflow of gas in the portion where the two layers follow.

Method for forming a contact point in the double-woven fabric having the air component properties are US Patent No. 6,220,309, US Patent 5,098,125, US Patent 5,011,183, US Patent 5,603,647, US Patent 6,595,244.

Among them, U.S. Patent No. 6,220,309 discloses a double woven fabric in which the layered tissue is plain weave and the joining portion is 2/2 basket weave. And a double fabric consisting of (2/2 baskets or 3/3 baskets) + (1/2 twill or 1/3 twill) + (5 sellers), the structure of the connection part of which is described in US Patent No. 5,603,647 Is described for double weaves in which the structure of the layered section is plain weave or basket or twill, and the structure of the seam section is 3/3 basket. In the above, the layer separating portion refers to a portion in which two fabric layers (upper layer and lower layer) are separated from each other so as to be inflated by air or the like in the double fabric, and the connecting portion refers to a portion in which two separated fabric layers are joined to each other. it means.

However, the double fabric according to the above method mainly uses 3/3 basket weaving or 2/2 basket weaving as the structure of the seam, and when used alone, the two layers separated by the gas expand the gas at the seam when expanded. There is a problem that the outflow of the air-ventilation is increased accordingly.

In order to solve the problems of the prior art, the object of the present invention is that the structure of the connection portion is dense and hard to significantly lower the air permeability of the connection portion can suppress the air leakage phenomenon when expanding by air, the fabric It is possible to manufacture various types of air pockets using jacquards by using all layers of plain weave, and it is possible to omit the sewing process in the weaving stage, thereby significantly lowering the manufacturing cost and air by gas with excellent weaving and smoothness. To provide a double fabric having a part property.

Still another object of the present invention is to provide a vehicle airbag manufactured by including a double fabric having air component properties of the gas.

In order to achieve the above object, the present invention is a double fabric having two parts of the fabric weaving at the same time weaving using a loom, and the air component consisting of a connecting portion connecting the two fabric layers separated from each other,

The tissue of the splice may be a 2/2 basket weave, runner, double weave, or one or more blended weaves of at least 13 yarns.

It provides a double fabric having air component properties comprising a.

The double fabric is composed of a layer separating portion (A, B) consisting of two fabric layers separated from each other, and a connecting portion (C) for joining the two fabric layers separated from each other,

The tissue of the layered portions (A, B) is a double weave forming two plain weave fabric layers separated from each other, the tissues of the left layered portion (A) and the right layered portion (B) on the basis of the joining portion is mutually In the same state, the tissue of the stitching portion (C) comprises 2/2 basket weaving, runners, double stitching, or at least one blended yarn thereof, stitched with at least 13 to 50 yarns. It is preferable. In addition, the double fabric is preferably coated with a synthetic resin.

In addition, the present invention provides a vehicle airbag manufactured by including a double fabric having the above air-part property. Preferably, the airbag is a side curtain type airbag for protecting a vehicle passenger.

Hereinafter, the present invention will be described in detail.

The present invention simplifies the manufacturing process at the time of manufacturing a shock-absorbing final product, such as an air bag, and can reduce the manufacturing cost, and also the air leakage phenomenon is maximized when the fastening force of the fastening portion is hard enough to be caught in the air. The present invention relates to a double-woven fabric having an air-part property that can be suppressed, is excellent in weaving, and has a smooth surface, so that a synthetic resin coating is also easy.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a complete organizational chart (a) having two separate plain weave planes and an expanded pattern (b) composed of a double weave of the present invention. 2 is a cross-sectional view of a tissue forming the double fabric of the present invention.

As shown in Figure 2, the double fabric of the present invention is composed of a layer separating portion (A, B) consisting of two fabric layers separated from each other, and a junction point (C) for joining the two fabric layers separated from each other Is done. The double-woven fabric with air component of the present invention simultaneously weaves two plain weaving layers (A or B in FIGS. 2 and 5) separated from each other on a weaving machine using a jacquard loom, and the two fabric layers The joining portion (C) for joining a 2/2 basket weave (a in FIG. 4), a main run (c in FIG. 4), a partial weave in plain weave (b in FIG. 4), or a mixture of one or more thereof Weaving, including wovens, is made of at least 13 yarns. That is, 13 or more of these yarns are added together.

The fabric layer of the present invention is intended primarily for the part-by-gas component, and the joining portion prevents the gas that generates the part from escaping between two separate fabric layers and withstands the pressure of the expanding gas. .

In the present invention, the junction point (C) refers to two separate fabric layers of the delamination (A, B), wherein the slope of the top layer forms the weft and tissue points of the bottom layer, or the weft of a considerable layer. The slopes and tissue points of the bottom layer are formed, the slopes of the bottom layer form the weft and tissue points of the top layer, or the wefts of the bottom layer form the slopes and tissue points of the top layer so that the two fabric layers Refers to a tissue point, tissue line, or tissue surface made to form a layer. The tissue that makes such a connection is called a connection organization, and when the connection organization appears in dots, it is called a connection point.When the connection organization appears in a line, it is called a connection line, and when the connection organization appears in a plane, it is called a connection surface. Connection and connection surface are called connection parts. In addition, the tissue point refers to the area where the warp and weft cross each other up and down to form a fabric.

As described above, the fabric including a tissue that is joined to the tissue separated into the top layer and the bottom layer may be divided into a layered tissue (A, B in Figs. 2 and 4) and a connecting tissue (C in Figs. 2 and 4), In addition, according to the arrangement of the pattern, the region closed by the layered tissue (B of FIG. 4), that is, the bulging region and the connective tissue (C of FIGS. 2 and 4), and the external tissue of the closed region by the connective tissue (FIG. 4). It has a structure that divides the space into three areas that are not related to parts performance as in A).

In FIG. 2, the left delamination part A tissue located on the left side and the right delamination part B tissue located on the right side are shown in FIG. 1. In addition, the left and right delamination portion is a joining portion consisting of at least 13 or more yarns (2/2 basket weave (a in FIG. 4), runners weave (c in FIG. 4), double woven weave (in Figure 4 b), or at least one mixed fabric thereof). The structure of this junction is as shown in FIG. 4.

The present invention consists of at least 13 or more yarns in order to further solidify the connection point, so that the connection part is very firm during air expansion to effectively suppress the external discharge of air to prevent air from escaping from the inside of the bag. Even better.

In addition, the present invention is preferably coated with a synthetic resin double fabric having air component properties in order to lower the amount of air emissions.

The synthetic resin used for the coating may be a synthetic resin commonly used for fiber coating, and of course, the silicone coating is preferably suitable for maintaining airtightness and strength during development.

Silicone resin coating is to effectively fill the gap of the double fabric fabric, it can be carried out on one or both sides of the fabric surface, the coating method is preferably a multi-stage coating to perform a plurality of coatings. When the undercoat and the topcoat are combined with the multi-step coating, not only the airtightness is improved but also the thickness of the fabric is reduced compared to the coating amount, thereby improving the flexibility effectively.

At this time, the preferred coating amount of the synthetic resin is preferably 40 g / ㎡ to 150 g / ㎡. If the coating amount is less than 40 g / ㎡ the air bag is a lot of ventilation volume can not be maintained in a swollen state for more than 5 seconds at a constant pressure after deployment. In addition, when the coating amount exceeds 150 g / ㎡, the airbag is too thick to worsen the storage capacity, and when the airbag is deployed, the airbag may not come into contact with the structure, and thus may not function.

Thus, in the double fabric of the present invention, the upper and lower layers are double tissues (FIG. 1) which form upper and lower layers, respectively, which are plain weave, and the stitching tissue should consist of 13 to 50 yarns. The double fabric thus constructed can prevent the medium from spilling when inflated by a gas such as air.

In addition, for the airtightness of the double fabric, it is very important to minimize the stretching force by high pressure air or the like, so that the method of forming the tissue at the point where the two layers are separated or the point at which the stitching starts as described above is It is the most important factor in the design of fabrics with parts by gas.

In addition, it is very important for the airtightness of the double fabric to have a minimum elongation to withstand tension due to high pressure air or the like, so that the formation of the tissue at the point where the two layers are separated or the point at which the stitching starts as described above is very important. The method is the most important factor in the design of fabrics with gaseous parts.

The double fabric of the present invention solved such a problem by using a plain weave having a high resistance to extension to the external tensile force as a fabric layer, preferably, the cover factor of the single-sided fabric to a high-density weaving of 1900 or more according to the following formula 1 As a result, the airtightness of the air bag can be further improved. When the cover factor is less than 1900, there is a problem that the air is easily discharged to the outside during the expansion of the air.

[Calculation 1]

Cover Factor (CF)

In addition, it is preferable that the double fabric of the present invention has an air discharge amount per unit length of the joined portion less than 0.8 l / min · cm when measured at a pressure of 2.5 KPa. When the air discharge amount per unit length of the joint portion exceeds 0.8 l / min · cm, the passenger protection function is lowered when used as a vehicle air bag.

In addition, the double fabric of the present invention has a thickness of 0.5 mm or less of the fabric surface of one fabric layer constituting the double fabric measured by the ASTM D 1777 method, the value of the stiffness measured by the ASTM D 4032 circular band method It is preferable that it is 3.5 kgf or less. When the thickness of the one fabric layer exceeds 0.5 mm, there is a problem that it is difficult to store when used as a vehicle air bag, and when the lecture degree exceeds 3.5 kgf, there is a problem that does not develop in a normal form by air pressure when used as a vehicle air bag. .

In addition, the double fabric of the present invention can exert its function as a side curtain type airbag only when the airbag internal pressure is measured after 5 seconds when the initial pressure of 50 KPa is applied to the airbag. In order to prevent the rupture when the side curtain type airbag is deployed by the inflat of high temperature and high pressure, the connection part (C of FIG. 2) should be at least 80 Kg / in when the barging strength is measured by ASTM D 5822 method. In addition, the elongation at break must not exceed 60% to minimize the amount of air escape to the joint during deployment and to prevent the yarn from melting due to high heat. In particular, since side curtain type airbags have a relatively large coating amount compared to general airbags, it is very important to maintain the strength when the fabric is worn due to the vibration of the vehicle in order to function as a side curtain type airbag even after a long period of time. . Therefore, the present invention satisfies the above conditions, the gas is applied at an initial pressure of 50 KPa, the internal pressure after 5 seconds is 6 KPa or more, the bark strength of the joint is 80 Kg / in or more, and the elongation at break is less than 60%, and The strength retention rate is 80% or more in the coating section wear test measured by ASTM D 4157. If the strength retention rate is less than 80%, the airbag may rupture upon deployment.

In another aspect, the present invention provides a vehicle side curtain airbag including a double fabric having a part of the gas, the side curtain airbag of the present invention is characterized in that the airbag is inflated for at least 5 seconds or more while the car is rolling. There is this. In the present invention, when the discharged through the joint portion of the airbag composed of a double fabric is measured at a pressure of 100 KPa, the airbag internal pressure must be 50 KPa to function as a side curtain type airbag.

The double fabric having the air component of the present invention described above can suppress the air leakage when inflated to the maximum can be usefully used for vehicle airbags, life vests, shock absorbing products and the like. In addition, the double fabric of the present invention is not required to sew to simplify the manufacturing process of the final product can be made cheap manufacturing cost.

Hereinafter, examples of the present invention will be described. The following examples are only for illustrating the present invention and the present invention is not limited to the following examples.

In the present invention, the physical properties of the double fabric were measured by the following method.

a) Air bag internal pressure of the double fabric was measured by the following method.

As shown in Figure 5, when the air is injected, the pressure in the air bag is increased, at this time, after reaching the maximum pressure was cut off the injected air to observe the change in the air bag internal pressure after 5.0 seconds. Since this operation is preferably controlled electronically to minimize the error, the electronic control device is used for the injection and blocking of the air.

b) Air emissions per unit length of the connection area (ℓ / min · cm)

: It was measured by measuring device equipped with regulator, flow meter and manometer to control air pressure. Specifically, the air of 2.5 KPa pressure is injected into the layered portion of the cut duplex fabric so that the cut duplex fabric is fully inflated, and then the total amount of air exiting the cut duplex fabric per unit time (l). After the measurement in units, the cut double fabric was divided by the total stitching length (cm) measured with vernier calipers, tape measure, straighteners, etc. to obtain the air emissions per unit length of the jointing section.

c) Cover factor: It calculated | required by following formula 1.

[Calculation 1]

Cover Factor (CF)

d) stiffness: measured by ASTM D 4032 circular band method.

e) Thickness of the fabric surface of one fabric layer was measured by ASTM D 1777 method.

f) Bark strength: measured by ASTM D 5822 method.

g) strength retention: measured by ASTM D 4157 method.

Example 1

Using the 426 denier polyamide multifilament as warp and weft yarn, the structure of the left delamination part (A) was the same as the double weave as shown in FIG. The double fabric was prepared by separating by a joining portion (C) consisting of a partial weaving fabric of the / 2 basket tissue and a plain weave double weave. At this time, the inclination density and the weft density were 52 bones / inch, and the cover factor was 2,131. Subsequently, a two-stage coating (coating amount: 100 g / cm 2) of silicon rubber on both sides of the woven double fabric, and then cut and air discharged per unit length of the jointed portion, the thickness of one fabric layer And the degree of lecture was measured. The air emissions per unit length of the measured joints were 0.6 l / min.cm, the stiffness was 2.5 kgf, and the thickness of one fabric layer was 0.4 mm.

Example 2

Using the 315 denier polyamide multifilament as warp and weft yarn, the structure of the left delamination part (A) was the same as the double weave as shown in FIG. The double fabric was prepared by separating by a joining portion (C) consisting of a partial weaving fabric of the / 2 basket tissue and a plain weave double weave. At this time, the inclination density and the weft density were 60 books / inch and the cover factor was 2,129, respectively. Subsequently, air flows out through the joint point or tissue point, which forms two layers separated by undercoating silicon rubber on both sides of the woven double fabric and two-stage coating (coating amount: 100 g / cm 2) of the top coating. The treatment was performed so as not to occur. This was cut to measure the amount of air discharged per unit length of the connection part, the thickness of one fabric layer and the stiffness by the above method. The air emissions per unit length of the measured joints were 0.7 L / min.cm, the stiffness was 1.9 kgf, and the thickness of one fabric layer was 0.39 mm.

Example 3

The same procedure as in Example 2 was carried out, but the double fabric was woven with a coating amount of silicone rubber of 90 g / m 2.

The thickness of one fabric surface measured by ASTM D 1777 of the double fabric was 0.39 mm, and the value of the stiffness measured by ASTM D 4032 circular band method was 1.9 Kgf. In addition, when the airbag internal pressure was measured 5 seconds after the initial pressure of 50 KPa was applied to the airbag composed of the airbag, 12.5 KPa, and the connection part (C in FIG. 2) was 119 Kg when the bark strength was measured by the ASTM D 5822 method. and elongation at break was 43%. In addition, in the coating section wear test measured in accordance with ASTM D 4157, a strength retention ratio of 90% was obtained to provide excellent storage and development ease as a side curtain for automobiles.

Example 4

In the same manner as in Example 1, using the 20 yarns, weaving a double fabric consisting of a basket structure and a runner's organization of the connection portion (C).

The thickness of one fabric surface measured by the ASTM D 1777 method of the double fabric was 0.4 mm, and the value of the stiffness measured by the ASTM D 4032 circular band method was 2.5 Kgf. In addition, when the airbag internal pressure was measured 5 seconds after the initial pressure of 50 KPa was applied to the airbag composed of this, 9.5 KPa, and the connection part (C in FIG. 2) was 123 Kg when the bark strength was measured by the ASTM D 5822 method. / in, and the elongation at break was 49%. In addition, in the coating section wear test measured in accordance with ASTM D 4157, the strength retention was 93%, thereby obtaining a product having excellent storage properties and ease of development as a side curtain for automobiles.

Comparative Example 1

Using 426 denier polyamide multifilament as warp and weft yarn, the woven part of the jacquard loom has 2/2 basket weave, the layered structure is plain weave, the warp density is 53 bones / inch and the weft density is 53 bones / Weaving double fabrics were inches. Subsequently, a two-stage coating (coating amount: 100 g / cm 2) of silicon rubber on both sides of the woven double fabric, and then cut and air discharged per unit length of the jointed portion, the thickness of one fabric layer And the degree of lecture was measured. The air emissions per unit length of the measured joints were 0.9 L / min.cm, the stiffness was 3.6 kgf, and the thickness of one fabric layer was 0.52 mm. In this case, the amount of air discharged per unit length was so high that the passenger protection function was low when used as a vehicle airbag.

Comparative Example 2

In the same manner as in Example 4, the warp density was 46 bones / inch, the weft density was 46 bones / inch, and the cover factor of the one-side fabric was 1880 to weave the double fabric.

The woven fabric was coated in the same manner as in Example 1, and the thickness of one fabric surface measured by ASTM D 1777 was 0.38 mm, and the value of stiffness measured by ASTM D 4032 circular band method was 1.9. It was good with Kgf. In addition, when the airbag internal pressure was measured 5 seconds after the initial pressure of 50 KPa was applied to the airbag composed of the airbag, 5.8 KPa, and the connection part (C in FIG. 2) was 109 Kg when the bark strength was measured by the ASTM D 5822 method. / in and elongation at break was 47%. In addition, the strength retention was 90% in the coating section wear test measured according to ASTM D 4157, and the storage performance was excellent. However, as a result of too low internal pressure, the airtightness of the air bag was bad, and thus the air bag was not maintained in a predetermined air bag shape when deployed.

Comparative Example 3

In the double fabric made in the same manner as in Example 1, the coating amount was 200 g / m 2, and the finished fabric was simply treated by a one-step coating method, and the amount of air discharged per unit length was 0.6 L / when measured at a pressure of 2.5 KPa. The airtightness of the air bag was maintained at min cm, and the predetermined air bag shape was maintained, but the thickness of the fabric measured by ASTM D 1777 method was 0.52 mm, and the value of the lecture measured by ASTM D 4032 circular band method was 3.6 Kgf. As a result, a product having poor storage properties and ease of development as a side curtain for automobiles was obtained.

As described above, the double-woven fabric having air component properties by the gas of the present invention comprises at least 13 or more yarns, which makes the joints very firm during air expansion, so that the layered portions may be expanded by air. In this case, the air flowing out from the inside of the bag can be prevented as much as possible. By omitting the sewing process in the weaving step, the manufacturing cost can be reduced by simplifying the manufacturing process at the time of manufacturing the shock absorbing final product such as an air bag, and the weaving property is excellent. The smooth coating is also easy to use, it can be usefully used in the production of vehicle airbags, life jackets, shock absorbers.

Figure 1 shows a complete organization (a) and expanded pattern (b) of a double weave having two separate flat weave consisting of a double weave according to the present invention.

2 is a cross-sectional view of a tissue forming the double fabric of the present invention.

3 is a cross-sectional state in which the double fabric with air parts in accordance with an embodiment of the present invention is inflated by air.

4 is a cross-sectional view of a 2/2 basket weave forming a connection of a separate double weave and its organization (a), a cross-sectional view and its organizational diagram (b) of a partial weave of a plain weave double weave, and a cross-section of a main weave and its organization ( c) is shown.

5 shows a method of measuring the internal pressure of the airbag.

<Description of the symbols for the main parts of the drawings>

A: left lamella tissue B: right lamella tissue

C: connection point

Claims (11)

As a double fabric having two parts of the fabric weaving at the same time weaving using a loom, and the air-part property consisting of a joining portion of the two fabric layers separated from each other, The tissue of the splice may be a 2/2 basket weave, runner, double weave, or one or more blended weaves of at least 13 yarns. Double fabric having air component properties of the gas comprising a. The method of claim 1, wherein the double fabric It consists of a layer separating portion (A, B) consisting of two fabric layers separated from each other, and a connecting portion (C) for joining two fabric layers separated from each other, The tissues of the layered portions (A, B) are double weaves forming two plain weave fabric layers separated from each other. In the same state, the tissue of the stitching portion (C) is 2/2 basket weaving, runners, double stitching, or at least one blended yarn thereof, stitched with 13 to 50 yarns. Double fabric having air component properties of the gas comprising a. The double-woven fabric having air component properties of a gas according to claim 1, wherein the air discharge amount (measured at 2.5 Kpa pressure) per unit length of the stitched portion is less than 0.8 l / min · cm. 2. The double fabric of claim 1, wherein the double fabric has air component properties of a gas having a value of stiffness of 3.5 Kgf or less. 2. The double fabric as set forth in claim 1, wherein the thickness of one fabric layer constituting said double fabric has air component properties of a gas having a thickness of 0.5 mm or less. The double fabric according to claim 1, wherein the cover factor value of one fabric layer constituting the double fabric is 1900 or more by gas, according to the following formula (1). [Calculation 1] Cover Factor (CF) According to claim 1, wherein the double fabric has an internal pressure of 6 KPa or more after 5 seconds when the gas is applied at an initial pressure of 50 KPa, the bark strength of the joint portion is 80 Kgf / in or more, and the elongation at break is less than 60%, And a double fabric having air component properties of a gas having a property of maintaining strength at least 80%. The double fabric of claim 1, wherein the double fabric is coated with a synthetic resin. The double fabric according to claim 8, wherein the coating amount on one side of the double fabric has air pneumatic properties by a gas having a weight of 40 g / m 2 to 150 g / m 2. 10. A vehicle airbag manufactured including a double fabric having air component properties of the gas of any one of claims 1 to 9. 11. The vehicle airbag of claim 10, wherein the airbag is a vehicle side curtain airbag.