JP2015183309A - Woven base cloth for air-bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive woven base cloth in which formation of an aperture at a boundary part of an inflation part and a non-inflation part when made into a bag body is suppressed and which has an excellent housing property.SOLUTION: The woven base cloth is made of a plain woven yarn of a thermoplastic resin, a single yarn of which is 1.5 dtex or more and less than 7 dtex and has a round cross section. The base cloth satisfies: Z=(Ww×Dw+Wf×Df)-50.8 {Ww=warp maximum width (μm), Dw=warp density (number/inch), Wf=weft maximum width (μm), Df=weft density (number/inch)} is 0-7; Q=q/S {q=ADAP(mm/s) measured according to ASTM_D6476 between 30-70 kPa, S=base cloth basis weight (g/m)} is 0.5-2.5; cover factor is 1850-2200; and (4) a polyolefin resin or the like exists on a fiber surface at 100-3000 ppm.

Description

  The present invention relates to a fabric base fabric for an airbag. More specifically, the present invention relates to a fabric base fabric for an air bag having high airtightness and flexibility, excellent storage properties, and high productivity.

The airbag reduces the impact of a collision at the time of an accident and the contact between in-vehicle equipment and the human body. Therefore, the air bag is required to be airtight. Specifically, the airtightness of the boundary between the inflatable part and the non-inflatable part affects the airtightness of the entire bag, but the airtightness of the aforementioned part is particularly important in an environment where high temperature gas is present during operation of the inflator. It is. On the other hand, since the storage space for airbags has been limited due to the expansion of the living space of vehicles as a recent trend, the storage property has also been cited as an important item.
In order to solve this, the following Patent Document 1 applies a low-definition yarn, and by designing the pulling strength of the constituent yarn, the elongation at 300 N with the tensile strength, the bending resistance, and the basis weight in a specific region. A technique for achieving weight reduction, storage property, and airtightness is disclosed. Although this technology can achieve storage and air tightness, it has the disadvantages of low productivity and high cost because it requires forced weaving of low-definition yarn to achieve this. . Patent Document 2 below discloses providing a highly airtight and inexpensive product by weaving a specific yarn width using a yarn composed of flat single yarn. For this, flat yarn is indispensable, and flat yarn tends to have lower strength than a round cross section, and recent airbags also have higher inflator output, and it does not necessarily have sufficient strength. I can not say.
As described above, a technology that can efficiently produce a base fabric having sufficient mechanical strength, high airtightness, and excellent storage properties has not yet been disclosed.

JP 2012-52280 A JP 2005-105446 A

  Under the current state of the art, the problem to be solved by the present invention is that an inexpensive fabric base that is suppressed from opening at the boundary between the inflatable portion and the non-inflatable portion when used as a bag and has excellent storage properties. Is to provide a cloth.

  The present inventor has made a specific amount of a specific substance present on the fiber surface to utilize the stress applied to the yarn during weaving to promote flattening of the yarn. In addition, the single yarn with a round cross section allows the yarns to slide smoothly due to the weaving tension, and in combination with the effect of the surface material described above, further flattening promotes the airtightness of the base fabric. The inventors have found that the airtightness can be maintained even when the weaving density is lowered, and have reached the invention.

That is, the present invention is as follows.
[1] A fabric base fabric plain woven with warp and weft yarns of thermoplastic resin having a round cross section with a single yarn of 1.5 or more and less than 7 dtex, under the following conditions:
(1) The following formula 1:
Z = (Ww × Dw + Wf × Df) −50.8
{Where Z value represented by Ww = maximum warp width (μm), Dw = warp density (main / inch), Wf = maximum weft width (μm), Df = weft density (main / inch)} is 0 ~ 7;
(2) Formula 2 below:
Q = q / S
{In the formula, q = 30 to 70 kPa of ADAP (mm / s) measured by ASTM_D6476, S = basis weight (g / m ² )} Q value is 0.5 to 2.5 is there;
(3) Formula 3 below:
CF = ((Tw / ρ) ^0.5 × Dw) + (Tf / ρ) ^0.5 × Df)
{Wherein the cover factor (CF) represented by Tw = warp fineness (Dtex), Tf = weft fineness (Dtex), ρ = fiber density (g / cm ³ )} is 1850-2200; and (4 ) Any one or a mixture of two or more selected from the group consisting of polyolefin resins, silicone resins, and esters is present on the fiber surface of the fabric base fabric at 100 to 3000 ppm based on the fiber weight. ;
Satisfy the fabric.

  [2] The base fabric according to [1], wherein both the warp and weft yarns have a fineness of 300 or more and less than 800 dtex.

  [3] The base fabric according to the above [1] or [2], wherein the drawing resistance values of the warp and the weft constituting the base fabric are both 20 to 150 N / cm / cm.

  [4] The base fabric according to any one of [1] to [3], wherein a value obtained by dividing the width of the warp and the weft constituting the base fabric by the thickness is 2.5 to 5.

  [5] Any of [1] to [4] above, wherein a total of four or more yarns with a fineness of 20 or more and less than 70 dtex other than the ground yarn are woven between the tangled yarn and the ground yarn at both ends of the fabric. The base fabric described in 1.

  [6] The fabric roll of the fabric base fabric according to any one of [1] to [5], wherein a ratio d / D between the diameter D of the roll center and the diameter d of the roll end is less than 1.07.

  [7] A non-coated airbag manufactured using the base fabric according to any one of [1] to [5] or the fabric roll according to [6].

  The fabric base fabric according to the present invention is a base fabric excellent in flexibility and airtightness, and has a high production efficiency.

It is the schematic for demonstrating the measuring method of drawing resistance. It is the schematic of the bag for a deployment test.

Hereinafter, embodiments of the present invention will be described in detail.
The fabric base fabric according to the present invention is flexible and excellent in storage property, and, in combination with frictional force adjustment by surface treatment of round cross-section single yarn and warp and weft, promotes flattening of the yarn and promotes air permeability. It can be suppressed to a practical level.
The fibers constituting the woven fabric according to the present invention have a round cross section with a single yarn fineness of 1.5 to 7 dtex, and preferably a single yarn fineness of 2 to 4 dtex. If the single yarn fineness is less than 1.5 dtex, the single yarn strength becomes weak, and process troubles such as fluff and yarn breakage increase due to friction with the wrinkles and wrinkles during weaving. On the other hand, when the single yarn fineness exceeds 7 dtex, the yarn bundle spreads and sufficient airtightness cannot be maintained. Moreover, the single yarn cross section of the fiber used for this invention is a round cross section. If the cross section is flat, even if the single yarn is rearranged at the time of weaving, the air tightness is greatly changed depending on the direction of the single yarn.

In the textile base fabric according to the present invention, the following formula 1:
Z = (Ww × Dw + Wf × Df) −50.8
{Where Z value represented by Ww = maximum warp width (μm), Dw = warp density (main / inch), Wf = maximum weft width (μm), Df = weft density (main / inch)} is 0 It is -7, Preferably it is 2-5, More preferably, it is 2-3. If it is less than 0, it cannot be said that the airtightness of the base fabric is sufficient, and the opening of the inflatable part and the non-inflatable part when used as a bag is likely to expand, and the airtightness may deteriorate rapidly. Exceeding the width of the yarn causes an unnecessarily widening of the yarn, resulting in excessive friction between the wefts, which may cause breakage from the seam portion of the bag due to a decrease in the tear strength of the base fabric.

Moreover, in the textile base fabric which concerns on this invention, following formula 2:
Q = q / S
{In the formula, q = 30 to 70 kPa of ADAP (mm / s) measured by ASTM_D6476, S = basis weight (g / m ² )} Q value is 0.5 to 2.5 Yes, preferably 1-2. If it is less than 0.5, the base fabric tends to be hard and the storage property may be deteriorated, and if it exceeds 2.5, the airtightness may be impaired.

Moreover, in the textile base fabric which concerns on this invention, following formula 3:
CF = ((Tw / ρ) ^0.5 × Dw) + (Tf / ρ) ^0.5 × Df)
The cover factor (CF) represented by {wherein Tw = warp fineness (Dtex), Tf = weft fineness (Dtex), ρ = fiber density (g / cm ³ )} is 1850-2200, preferably 1900. ~ 2100, more preferably 1950 ~ 2050. If it is less than 1850, airtightness may be impaired, and if it exceeds 2200, the bending resistance of the base fabric becomes high, and the desired flexible base fabric cannot be obtained.

  Moreover, in the textile base fabric according to the present invention, in order to express the base fabric characteristics, any one or a mixture of two or more selected from the group consisting of polyolefin resins, silicone resins, and esters, It is necessary to be present on the fiber surface of the woven base fabric at 100 to 3000 ppm, preferably 500 to 2000 ppm based on the fiber weight. If it is less than 100 ppm, the frictional force between the desired warp and weft yarns becomes high and the yarn bundle cannot be sufficiently flattened during weaving, so the Z value may be small. If it exceeds 3000 ppm, the frictional force will drop excessively, and when the bag is used, the boundary between the inflatable part and the non-inflatable part will easily open, and the airtightness of the sewn part will be impaired, and the flammability will be within the standard. It may become impossible to maintain. Here, the surface refers to the surface of a single yarn constituting the fiber.

  As a method of attaching the above-mentioned treatment agent to the surface of the single yarn constituting the fiber, it is provided by providing an oil supply roll at the spinning stage or warp aging, or by immersion before the heat setting step. Moreover, the process to provide can be divided and provided in any one or several processes mentioned above. Substances to be adhered include, for example, polyethylene, polypropylene resin, and fatty acid esters as polyolefins, such as dibasic acid and monohydric alcohol, polyhydric alcohol and monobasic ester, or polyhydric alcohol and dibasic acid. Dimethyl silicon or a modified product thereof can be used as the ester or silicon resin. Examples of forms to be applied include organic solutions such as hydrocarbons, aqueous solutions, and emulsions. However, it is preferable to use water from the viewpoint of process safety, and emulsions are most preferable. As the thermoplastic fiber, those selected from the group consisting of polyamides and polyesters are suitable because they are balanced in terms of cost, physical properties, and the like. In particular, nylon 66 and polyethylene terephthalate fiber can be preferably used, and nylon 66 is most preferable in consideration of heat resistance, friction characteristics, and high elongation. The fiber is obtained by obtaining multifilaments by melt spinning, applying an oil agent after cooling, drawing with a hot roll, and providing entanglement with pressurized air.

  When the value obtained by dividing the width of the cross section of the fiber bundle constituting the woven fabric of the present invention by the height is 2.5 to 5.0, flexibility and airtightness are more suitably expressed. When the force is applied to the base fabric when it is 2.5 or more, the constituent fibers move to the extent, and the tearing strength works advantageously. Moreover, if it is 5.0 or less, the binding force of the warp will be improved, and airtightness will be advantageous.

  The fineness of the warp and weft yarns constituting the base fabric of the present invention is more preferably 300 to 800 dtex. At 300 dtex or more, the storage property is further improved due to the improved flexibility. Further, if it is 800 dtex or less, the density can be reduced, which is more advantageous for productivity. More preferably, it is 400-700 dtex.

  When the drawing resistance value of the yarn constituting the woven fabric of the present invention is 20 to 150 N / cm / cm, the airtightness can be better maintained. When it is 20 N / cm / cm or more, the degree of freedom of the yarn is high, so that it becomes a flexible base fabric, and the flexibility and the tearing strength work advantageously. On the other hand, if it is 150 N / cm / cm or less, the friction between the warp and weft is increased, which is advantageous for maintaining the airtightness of the sewing portion. The weaving resistance within this range is preferably weaving with a warp tension of 0.22 cN / dtex or more, but if the tension is increased too much, fluff may be generated due to wrinkles and wrinkles. It is necessary to devise materials such as the material and shape of the temples and temples. In order to prevent the loosening of the ears, the same type and / or different types of yarn from the fabric base yarn are applied to both ends of the fabric base fabric of the present invention. For example, entangled yarn and force yarn.

  As described above, the value obtained by dividing the width of the yarn constituting the base fabric of the present invention by the thickness is preferably 2.5 to 5. If it is 2.5 or more, the effect of thickness is advantageous for heat resistance. If it is 5 or less, flattening progresses, which is advantageous for flexibility and airtightness. In order to make the above range, weaving is preferably performed with a warp tension of 0.25 cN / dtex or more, but if the tension is increased too much, fluff may be generated by wrinkles and wrinkles, and it is necessary to balance. There are cases where weaving tension can be lowered by increasing the number of single yarns.

  When producing the fabric base fabric of the present invention, it is preferable to use entangled yarn and additional yarn for quality improvement. The entanglement thread is placed at the end of the most fabric to prevent the ears from fraying or loosening. The entangled yarn is usually woven into a woven fabric with a Leno device at both ears in pairs. When a monofilament of 15 to 100 dtex is applied, the ears are tightly tightened, and the sagging of the ears and the resulting flare and warp density variations can be effectively reduced. When the entangled yarn is 15 dtex or more, the ear portion is particularly tight, and when it is 100 dtex or less, the yarn is reasonably thick, so that handling is easy.

  Furthermore, if two or more yarns, called additional yarns, are present between one side of the fabric and the opposite end entangled yarn, it is effective for preventing the fabric from loosening. This is supplied from another yarn feeder. It is preferable that a total of four or more additional yarns having a fineness of 20 to less than 100 dtex are woven between the entangled yarn and the ground yarn at both ends of the fabric. As the reinforcing yarn, monofilament, crimped yarn, spun yarn, and yarn of the same type as the ground yarn can be used alone or in combination. For these, the tension and the thread type to be applied are appropriately selected while observing the wrinkles and looseness of the ears and the ear height of the product roll. Further, a plain weave structure is generally adopted as the reinforcing yarn part, but it can be changed depending on the state of the ear part and is not particularly limited.

  As the weft insertion mechanism of the loom used when weaving the fabric base fabric of the present invention, a general device such as rapier, water jet, air jet, shuttle, or projectile can be selected.

In the set processing for obtaining the fabric base fabric of the present invention, heat setting may be performed. The setting method at that time is not particularly limited, and a known method can be selected. For example, a method of drying after passing through a hot water tank and heat setting in a heat setting furnace such as a tenter, or a method of omitting the tenter can be selected. Generally, a method of applying tension by a difference in traveling speed between the supply roll and the in-furnace fixture in the warp direction during heat setting is generally used. Further, in the weft direction, for example, a method of suppressing shrinkage in the weft direction only by pin and clip fixation or friction between the in-furnace roll and the fabric can be employed. In heating, electricity or gas combustion heating air may be circulated or radiation from an infrared heater may be used. The set temperature at this time is preferably in the range of 100 to 200 ° C. Moreover, when using a tenter at the time of heat setting, the following formula 4:
Tenter overfeed rate = (Vw−Vs) / Vs × 100
A tenter overfeed rate represented by {in the formula, Vs = feed rate to the heating set machine after refining of the workpiece (m / min), Vw = speed in the heating set machine after refining of the object (m / min)} is −10 Adjust to ˜2%, and the following formula 5:
Tenter width change rate = (Dw−Ds) / Ds * 100
The tenter width change rate represented by {in the formula, Ds = feed workpiece width to the heating set machine after fabric refining (mm), Dw = fabric width in the heating set machine after fabric refining}. By adjusting in the range of about 2%, a good quality base fabric with a small density distribution can be obtained.

Moreover, you may implement only drying as it is after refining, without using heating setting machines, such as a tenter. In this case, the following formula 6:
Refining overfeed rate = (Sw−Ss) / Ss * 100
{In the formula, Ss = feeding speed of fabric to refining machine (m / min), Sw = winding speed of fabric (m / min)}, and a refining overfeed rate of about −15 to 0%. It is preferable.

  When the fabric base fabric according to the present invention is wound into a roll, the diameter ratio between the roll center and the end is 7%, that is, the ratio of the diameter D of the roll center to the diameter d of the roll end. It is preferable that d / D is less than 1.07. By making the content less than 7%, a good quality product with less wrinkles on the product's ears can be obtained, and a product with a lower risk of damage such as rubbing of the product's product ears with the floor or packaging material during roll transportation is produced. be able to.

  The fabric base fabric according to the present invention can be particularly suitably used as an airbag base fabric. The bag can be formed by sewing or bag weaving, and can be used as a driver seat, a passenger seat, a side curtain, a knee bag, and a pedestrian protection bag.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited only to these Examples.
First, various measurement methods and evaluation methods used in Examples and the like will be described.
(1) The fineness, strength, and elongation of the fiber were measured according to JIS L1013.
(2) The density of the fiber was measured with a density gradient tube.
(3) Base fabric weight: 3 points of 10 cm square were cut out, measured to 3 decimal places with an electronic balance, and determined as the weight per 1 m ² from the average.
(4) Density of base fabric; using a TEXTEST FX3255, the warp and the weft were measured at 5 points, and the average was taken as the density.
(5) The strength and elongation of the base fabric were measured according to the strip method of JIS L1096.

(6) The tear strength of the base fabric was measured by the single tongue method of JIS L1096.
(7) Weaving stop: Weaving was carried out for 2 days and the stop per day was observed. However, the stop by changing the weft was excluded.
(8) The amount of cloth-residual silicon resin adhered was calculated from the silicon atom content by fluorescent X-ray analysis after drying the extract after Soxhlet extraction of the base fabric with normal hexane.
(9) The amount of base fabric residual olefin resin adhered was calculated after the base fabric was Soxhlet extracted with normal hexane, the extract was dried, the residue was separated by GPC, and the content was calculated.
(10) The base fabric residual esters were calculated from the weight of the base fabric after the base fabric was Soxhlet extracted with normal hexane after drying, and the extract was dried. When mixed with silicon and / or olefin resin, the total amount was determined by Soxhlet extraction and then subtracted from each amount.

(11) The width and thickness of the fibers constituting the base fabric were measured using a Rigaku high-resolution X-ray microscope nano3DX, X-rays were generated on the X-ray target with Cu and a tube voltage of 40 kV / 30 mA, the sample was photographed, and the dimensions were measured. Asked.
(12) The pulling resistance value was measured by measuring the pulling resistance measurement sample (sample) shown in FIG. 1 at three locations in the width direction at a speed of 10 mm / min in Tensilon manufactured by A & D.
P = F (Dx / 2.54) / (15 × 2.54 / Dy)
{In the formula, P = pull resistance (N / cm / cm), F = measurement value (N), Dx = weave density in the measurement direction (main / inch), Dy = weave density in the direction perpendicular to the measurement direction (Book / inch)}.
(13) Weave density: FX3255 manufactured by TEXTEST was used.
(14) Base fabric aeration rate: Measured at an initial pressure of 170 kPa using a 400 cc tank with FX3350 manufactured by TEXTEST, and an average dynamic aeration rate of 30 kPa to 70 kPa was measured.
(15) Stitch aeration: Cut out two pieces of fabric with a length of 38 cm and a width of 15 cm from the woven fabric and sew them with 50 stitches / dm main stitch with a sewing thread made of 1350 dtex twisted yarn, and tie both ends of the yarn. A sample for weft and weft was prepared by stitching together the warp directions of the woven fabric and stitching the weft directions. Thereafter, the A & D Tensilon was sandwiched between 60 mm and a load of 1500 N was applied at a speed of 100 mm / min, after which the tension was once released and left for 3 hours. This sample was measured at an initial pressure of 300 kPa using a 400 cc tank by FX3350 manufactured by TEXTEST, and an average dynamic air flow rate from 30 kPa to 70 kPa was measured.

(16) Roll shape index (d / D): The diameter D of the roll center and the diameter of the roll end were measured and calculated.
(17) Bag development evaluation: A bag having a diameter of 8 cm and a length of 10 cm from the woven fabric and having a diameter of 30 cm was sewn with a sewing thread composed of 1350 dtex twisted thread with 65 stitches / dm main stitch. The bag shown in FIG. 2 was produced by inverting this front and back. Using the CGS system manufactured by Microsys, the state of the bag after deployment was observed when helium gas was instantaneously supplied under the conditions of a pressure of 5 MPa, an orifice of 0.6 inches, and a tank capacity of 250 cc. The most open portion of the seam portion was visually measured and evaluated as 3 mm or less as small, 3 to 6 mm as medium, and 6 mm or more as large.

[Example 1]
Polyamide 6 · 6 resin is melt-spun at 300 ° C, the spinning oil is applied to the fiber 0.8% while cooling, and then stretched 4.9 times with a 200 ° C hot-drawing roll, and compressed air After imparting entanglement, a raw yarn having a fineness of 470 dtex and 136 filaments was obtained. The strength of the raw yarn was 8.56 cN / dtex and the elongation at break was 21%. Using this raw yarn, without any gluing, a weft width of 2.3 m of LWT710 manufactured by Toyota Industries Corporation, a warp density of 45.2 / inch, a set weft density of 44 / inch, a fabric width of 230 cm, a warp tension of 0. Plain weaving was performed at 32 cN / dtex and a loom rotation speed of 600 rpm. The weft insertion device used was a type that was inserted only by free flight. The two ears were used as two entangled yarns, one each of 22 dtex nylon 66 monofilament. The reinforcing yarn was made into a plain weave by using 22 dtex nylon 66 monofilament, two on each side between the entangled yarn and the ground yarn. After that, after refining in an 80 ° C. hot water bath at a refining overfeed rate of −10% under 400 N tension for 60 seconds, it was immersed in a silicone resin emulsion with a solid content of 1500 ppm, and then a tenter overfeed with a pin tenter. The desired non-coated base fabric was obtained at 4%, a tenter width setting ratio of -2%, and a heat setting temperature of 180 ° C. For this base fabric, weaving density, number of stops during weaving, thickness and width of constituent yarn, tensile strength and elongation of base fabric, pulling resistance, bending resistance, air permeability after seam opening, roll shape, bag deployment test The results shown in Table 1 below were obtained.

[Example 2]
The same yarn as in Example 1 was used, and the same silicon resin emulsion as in Example 1 was adjusted to a solid content concentration of 3.0% with a touch roll during aging. The contact length between the touch roll and the warp was 30 mm, the yarn speed was 100 m / min, the warp speed was 15 rpm, and a warp was prepared under the same weaving conditions as in Example 1. Thereafter, it is treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds, treated at a refining overfeed rate of −10% at that time, and dried at 110 ° C. for 60 seconds in a drying drum to obtain a desired base fabric. It was. Evaluation similar to Example 1 was performed about this base fabric, and the result shown in the following Table 1 was obtained.

[Example 3]
Polyamide 6 · 6 resin is melt-spun at 300 ° C, and the spinning oil is applied to the fiber 0.8% while cooling, then stretched 4.7 times with a 200 ° C hot-drawing roll, and compressed air After imparting entanglement, a raw yarn having a fineness of 470 dtex and a filament number of 216 was obtained. The strength of the raw yarn was 8.6 cN / dtex and the elongation at break was 20%. Weaving was performed in the same manner as in Example 2 except that the warp tension was changed to 0.36 cN / dtex using this raw yarn. Subsequently, it processed with the refining overfeed rate of -6% without letting it pass through a refining tank, and it dried at 110 degreeC for 60 second with the drying drum, and obtained the target base fabric. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 1 was obtained.

[Example 4]
The same weaving conditions as in Example 2 were used except that the warp tension was 0.22 cN / dtex during weaving. Post-processing was performed in the same manner as in Example 3 to obtain the desired base fabric. The results of evaluating this base fabric in the same manner as in Example 1 are shown in Table 1 below.

[Example 5]
After weaving the same as in Example 1, the same silicone resin emulsion was adjusted to a solid content of 5000 ppm and immersed, and dried in a drying drum at 110 ° C. for 60 seconds without passing through a hot water bath to obtain the desired base fabric. The results of evaluating this base fabric in the same manner as in Example 1 are shown in Table 1 below.

[Example 6]
The same yarn as in Example 1 was used, and warping was the same as in Example 2 except that a polypropylene resin was applied. Using this warp beam, weaving was performed in the same manner as in Example 2, and post-processing was performed in the same manner as in Example 3 to obtain the desired base fabric. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 1 was obtained.

[Example 7]
The fiber was changed to polyethylene terephthalate, and the other base fabric was obtained under the same weaving conditions and processing conditions as in Example 6. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 1 was obtained.

[Example 8]
A yarn similar to that used in Example 1 was used, and a warp beam was produced without applying a resin or the like during warp aging. The yarn was woven under the same conditions as in Example 1. This was post-processed in the same manner as in Example 3 to obtain the desired base fabric. Evaluation similar to Example 1 was implemented for this base fabric, and the results shown in Table 1 below were obtained.

[Example 9]
A yarn similar to that used in Example 1 was used, and a warp beam was produced without applying a resin or the like during warp aging. The yarn was woven under the same conditions as in Example 1. This was post-processed under the same conditions as in Example 2 to obtain the desired base fabric. Evaluation similar to Example 1 was implemented for this base fabric, and the results shown in Table 1 below were obtained.

[Example 10]
Polyamide 6 · 6 resin is melt-spun at 300 ° C, and the spinning oil is applied to the fiber 0.8% while cooling, and then stretched 4.9 times with a 200 ° C hot-stretching roll, and compressed air After imparting entanglement, a yarn having a fineness of 235 dtex and a filament count of 36 was obtained. The strength of the raw yarn was 8.90 cN / dtex and the elongation at break was 21%. A warp beam was obtained under the same conditions as in Example 2 except that the yarn had a warp density of 65 yarns / inch. Weaving was performed under the same conditions as in Example 1 except that the weft density was 66 / inch. Post-processing was performed under the same conditions as in Example 3 to obtain the desired base fabric. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 1 was obtained.

[Example 11]
The warp beam and weaving conditions were the same as in Example 2 except that the additional yarn was changed to 110 dtex polyamide yarn. Post-processing conditions were the same as in Example 3 to obtain the desired woven fabric. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 1 was obtained.

  The thing in the range of the said invention [1] was able to have coexistence of a softness | flexibility and airtightness, and the base fabric by which the opening was suppressed after the bag expansion | deployment was obtained.

[Comparative Example 1]
Polyamide 6.6 resin is melt-spun at 300 ° C., and a spinning oil is applied to the fiber at a rate of 0.8% while cooling, and then stretched 4.85 times with a 200 ° C. hot stretch roll, and compressed air. After imparting entanglement, a yarn having a fineness of 470 dtxex and a filament count of 36 was obtained. The strength of the raw yarn was 8.56 cN / dtex, and the elongation at break was 20%. This yarn was subjected to warping and weaving in the same manner as in Example 2, and post-processing was performed in the same manner as in Example 3 to obtain the desired base fabric. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 2 was obtained. In Comparative Example 1, the Z value was decreased by using a yarn having a large single yarn fineness, and the airtightness could not be maintained. In addition, bursts occurred during bag deployment.

[Comparative Example 2]
Polyamide 6.6 resin is melt-spun at 300 ° C, and a spinning oil is applied to the fiber 0.8% while cooling, and then stretched 4.75 times with a 200 ° C hot-drawing roll, and compressed air. After imparting entanglement, a raw yarn having a fineness of 155 dtxex and 136 filaments was obtained. The strength of the raw yarn was 8.1 cN / dtex, and the elongation at break was 25%. Three yarns were combined to make 465 dtex. This was warped in the same manner as in Comparative Example 1, and weaving was performed under the same conditions. Then, the same post-processing as Example 2 was implemented and the target base fabric was obtained. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 2 was obtained. This base fabric was a base fabric at the time of conflict because the single yarn fineness was small, and the obtained base fabric had a large Z value, and because there was no degree of freedom of fibers, it became a base fabric with low tearing. This development test caused a burst.

[Comparative Example 3]
The same weaving was carried out using the same warping beam as in Example 1. In post-processing, a bath is provided in front of the washing tank, the base fabric is immersed in the same silicone resin emulsion as in Example 1 diluted to 1% solid content, and dried for 60 seconds in a 110 ° C. drying drum without refining. A base fabric was obtained. This base fabric was evaluated in the same manner as in Comparative Example 1, and the results shown in Table 2 below were obtained. This base fabric became a base fabric having a high air permeability after opening due to the presence of an excessive processing agent, and a burst occurred in the development test.

[Comparative Example 4]
Using the same yarn as in Example 1, an aqueous solution containing 1% linear alkyl sulfate was applied instead of the resin emulsion during aging, and the warp was wound up. The yarn was subjected to the same weaving and post-processing as in Example 2 to obtain the desired base fabric. What remained in the obtained base fabric was 20 ppm of esters. Evaluation similar to Example 1 was implemented about this base fabric, and the result shown in the following Table 2 was obtained. In Comparative Example 4, there were many weaving stops, and the obtained base fabric also had low tear strength, and bursts occurred in the bag deployment test.

[Comparative Example 5]
The same warping was performed except that the same yarn as in Example 2 was used and the warp density was 52 / inch. Using this warp, the weft density design was 53 / inch, and both ears were used as two entangled yarns on each side of 22 dtex nylon 66 monofilament. The reinforce yarn was made into a plain weave by using 22 dtex nylon 66 monofilament and four pieces on each side between the entangled yarn and the ground yarn. Then, the post-processing similar to Example 3 was implemented, and the target base fabric was obtained. This base fabric was evaluated in the same manner as in Example 1, and the results shown in Table 2 below were obtained. Under these conditions, the weave density was too high, and the bending resistance of the base fabric was very high.

[Comparative Example 6]
The same warp was performed except that the same yarn as in Example 2 was used and the warp density was 38 / inch. Using this warp, the weft density was set to 39 / inch, and weaving was performed under the same conditions as in Example 2 and processed under the same conditions as in Example 3 to obtain the desired base fabric. Evaluation similar to Example 1 was performed about this base fabric, and the result shown in the following Table 2 was obtained. Under these conditions, since the weave density was too low, the airtightness was impaired, and a burst of the produced bag was observed.

  As is clear from Comparative Examples 1 to 6, the thing outside the range of the invention [1] cannot maintain the airtightness of the seam portion when a load is applied to the seam, or the tear strength is reduced. It was confirmed that the problem was not able to be achieved because of the inconvenience of bursting in the produced bag and the base fabric becoming hard.

  The fabric base fabric according to the present invention can be suitably used as an airbag base fabric having high airtightness and flexibility, excellent storage properties, and high productivity.

Claims (7)

A fabric base fabric plain woven with warp and weft yarns of a thermoplastic resin having a round cross section with a single yarn of 1.5 or more and less than 7 dtex, under the following conditions:
(1) The following formula 1:
Z = (Ww × Dw + Wf × Df) −50.8
{Where Z value represented by Ww = maximum warp width (μm), Dw = warp density (main / inch), Wf = maximum weft width (μm), Df = weft density (main / inch)} is 0 ~ 7;
(2) Formula 2 below:
Q = q / S
{In the formula, q = 30 to 70 kPa of ADAP (mm / s) measured by ASTM_D6476, S = basis weight (g / m ² )} Q value is 0.5 to 2.5 is there;
(3) Formula 3 below:
CF = ((Tw / ρ) ^0.5 × Dw) + (Tf / ρ) ^0.5 × Df)
{Wherein the cover factor (CF) represented by Tw = warp fineness (Dtex), Tf = weft fineness (Dtex), ρ = fiber density (g / cm ³ )} is 1850-2200; and (4 ) Any one or a mixture of two or more selected from the group consisting of polyolefin resins, silicone resins, and esters is present on the fiber surface of the fabric base fabric at 100 to 3000 ppm based on the fiber weight. ;
Satisfying the base fabric.   The base fabric according to claim 1, wherein both the warp and weft yarns have a fineness of 300 or more and less than 800 dtex.   The base fabric according to claim 1 or 2, wherein the drawing resistance values of the warp and the weft constituting the base fabric are both 20 to 150 N / cm / cm.   The base fabric according to any one of claims 1 to 3, wherein a value obtained by dividing a width of a warp and a weft constituting the base fabric by a thickness is 2.5 to 5.   The base according to any one of claims 1 to 4, wherein a total of four or more yarns having a fineness of 20 to less than 70 dtex other than the ground yarn are woven between the tangled yarn and the ground yarn at both ends of the fabric. cloth.   The fabric roll of the fabric base fabric according to any one of claims 1 to 5, wherein a ratio d / D of the diameter D of the roll center portion and the diameter d of the roll end portion is less than 1.07.   A non-coated airbag manufactured using the base fabric according to any one of claims 1 to 5 or the fabric roll according to claim 6.

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