JP6694490B2 - Fabric base fabric for airbags - Google Patents

Description

  The present invention relates to a textile base fabric for airbags. More specifically, the present invention relates to a woven fabric base fabric for an airbag, which is highly airtight and flexible, has excellent storability, and has high productivity.

The airbag reduces the impact of a collision at the time of an accident and the contact between in-vehicle accessories and the human body. Therefore, the air bag is required to have airtightness. Specifically, the airtightness of the boundary between the inflated part and the non-inflated part affects the airtightness of the entire bag, but the airtightness of the above-mentioned part is particularly important in the environment where high temperature gas is present when the inflator is activated. Is. On the other hand, as a recent tendency is that the accommodation space of the airbag is limited due to the expansion of the living space of the vehicle and the like, the storability has come to be mentioned as an important item.
In order to solve this, in Patent Document 1 below, a low-fineness yarn is applied, and the pull-out strength of the constituent threads, the elongation at 300 N at tensile strength, the bending resistance, and the basis weight are designed in specific areas. A technique for achieving weight reduction, storability, and airtightness is disclosed. Although this technology can achieve storage and airtightness, it has the drawback of low productivity and high cost because it requires high density weaving of low-definition yarn to achieve this. .. In addition, Patent Document 2 below discloses that a highly airtight and inexpensive product is provided by using a yarn composed of flat single yarns and weaving to a specific yarn width. Flat yarn is indispensable for this, and the strength of the flat yarn is likely to be lower than that of the round cross section, and recent airbags also have a high output of an inflator, and it is not always said that they have sufficient strength. I can not say.
As described above, a technique capable of efficiently producing a base fabric having sufficient mechanical strength, high airtightness, and excellent storability has not been disclosed yet.

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 to suppress the opening of the boundary portion between the inflatable portion and the non-inflatable portion when the bag body is formed, and an inexpensive woven fabric base excellent in storability. Is to provide the cloth.

  The present inventor promoted flattening of the yarn by utilizing the stress applied to the yarn during weaving by allowing a specific amount of a specific substance to exist on the fiber surface. 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 above-mentioned surface material, promotes flattening, thereby improving the airtightness of the base fabric. However, the inventors have found that the airtightness can be maintained even if the weaving density is reduced, and the present invention has been completed.

That is, the present invention is as follows.
[1] A woven fabric base cloth plain-woven with thermoplastic resin warp and weft yarns having a circular cross section with a single yarn fineness of 1.5 or more and 4 dtex or less, and the following requirements:
(1) The following formula 1:
Z = (Ww x Dw + Wf x Df) -50.8
Z value represented by {Ww = maximum width of warp ( mm ), Dw = warp density (thread / inch), Wf = maximum width of weft ( mm ), Df = weft density (thread / inch)} is 0 ~ 7;
(2) The following formula 2:
Q = q / S
{Wherein q = ADAP (mm / s) between 30 and 70 kPa measured by ASTM_D6476, S = base fabric weight (g / m ² )}, and the Q value is 0.5 to 2.5. is there;
(3) The following formula 3:
CF = ((Tw / ρ) ^0.5 × Dw) + (Tf / ρ) ^0.5 × Df)
The cover factor (CF) represented by {wherein Tw = warp yarn fineness (Dtex), Tf = weft yarn fineness (Dtex), ρ = fiber density (g / cm ³ )} is 1984 to 2050 ;
(4) Silicone resin is present on the fiber surface of the woven base fabric at 60 to 1100 ppm based on the weight of the fiber;
(5) The warp tear strength of the base fabric is 210 N or more;
(6) The weft tear strength of the base fabric is 205 N or more;
(7) The value obtained by dividing the width of the warp constituting the base cloth by the thickness is 2.5 to 5;
(8) The value obtained by dividing the width of the weft constituting the base cloth by the thickness is 3.1 to 5; and (9) the air permeability of the base cloth is 280 mm / s or less;
The woven base fabric satisfying the above.
[2] The woven base fabric according to the above [1], wherein the fineness of the warp yarn and the weft yarn is both 300 or more and less than 800 dtex.
[3] The woven fabric according to the above [1] or [2], wherein the warp yarns and the wefts constituting the woven fabric have pull-out resistance values of 20 to 150 N / cm / cm.
[4] The fabric of the woven fabric according to any one of [1] to [3], wherein the fineness other than the ground yarn is 20 or more and less than 70 dtex between the entangled yarn and the ground yarn at both ends of the fabric. The above-mentioned piece of cloth is characterized in that a total of 4 or more threads are woven on the left and right.
[5] In the fabric roll of the woven fabric according to any one of [1] to [3], the ratio d / D of the diameter D of the roll central portion and the diameter d of the roll end portion is 1. It is less than 07, The said cloth roll.
[6] A non-coated airbag made of the base fabric according to any one of [1] to [3].
[7] A method for manufacturing a non-coated airbag, which includes a step of using the cloth material according to [4] or the cloth material roll according to [5].

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

It is a schematic diagram for explaining a measuring method of pull-out resistance. It is a schematic diagram of a deployment test bag.

Hereinafter, embodiments of the present invention will be described in detail.
The woven base fabric according to the present invention is flexible and excellent in storability, and promotes flatness of the yarn by adjusting the frictional force by the surface treatment of the round cross section single yarn and the warp and high tension weaving, and improves the air permeability. It can be suppressed to a practical level.
The fibers constituting the woven fabric according to the present invention have a circular cross section with a single yarn fineness of 1.5 to 7 dtex, and preferably have a single yarn fineness of 2 to 4 dtex. When the single yarn fineness is less than 1.5 dtex, the single yarn strength is weakened, and process troubles such as fluff and yarn breakage are increased due to friction in the reed and the heddle during weaving. When the single yarn fineness exceeds 7 dtex, the yarn bundle spreads and it becomes impossible to maintain sufficient airtightness. The single yarn cross section of the fiber used in the present invention is a round cross section. With a flat cross section, even if the single yarns are rearranged during weaving, the airtightness is greatly changed depending on the direction of the single yarns, so that the improvement of the airtightness may be insufficient.

In the woven base fabric according to the present invention, the following formula 1:
Z = (Ww x Dw + Wf x Df) -50.8
Z value represented by {Ww = maximum warp width (μm), Dw = warp density (thread / inch), Wf = weft maximum width (μm), Df = weft density (thread / inch)} is 0 -7, preferably 2-5, more preferably 2-3. When it is less than 0, the airtightness of the base fabric cannot be said to be sufficient, and the opening between the inflated part and the non-inflated part when the bag is formed may be easily expanded, and the airtightness may be rapidly deteriorated. If the value exceeds the above range, the yarns will spread more than necessary, and excessive friction between the warp and weft may occur, which may cause breakage from the seam when the bag is formed due to the decrease in tear strength of the base fabric.

Further, in the woven base fabric according to the present invention, the following formula 2:
Q = q / S
{Wherein q = ADAP (mm / s) between 30 and 70 kPa measured by ASTM_D6476, S = base fabric weight (g / m ² )}, and the Q value is 0.5 to 2.5. Yes, and preferably 1-2. If it is less than 0.5, the base fabric tends to be hard and the storage properties may deteriorate, and if it exceeds 2.5, the airtightness may be impaired.

Further, in the woven base fabric according to the present invention, the following formula 3:
CF = ((Tw / ρ) ^0.5 × Dw) + (Tf / ρ) ^0.5 × Df)
The cover factor (CF) represented by {In the formula, Tw = warp yarn fineness (Dtex), Tf = weft yarn fineness (Dtex), ρ = fiber density (g / cm ³ )} is 1850 to 2200, and preferably 1900. ˜2100, more preferably 1950 to 2050. If it is less than 1850, the airtightness may be impaired, and if it exceeds 2200, the bending resistance of the base fabric becomes high and the desired soft base fabric cannot be obtained.

  Further, in the woven base fabric according to the present invention, in order to express the base fabric characteristics, any one kind or a mixture of two or more kinds selected from the group consisting of a polyolefin resin, a silicone resin, and an ester, It is necessary to be present in the fiber surface of the woven fabric at 100 to 3000 ppm, preferably 500 to 2000 ppm, based on the weight of the fiber. If it is less than 100 ppm, the desired frictional force between the warp and weft threads becomes high and the yarn bundle cannot be sufficiently flattened at the time of weaving, so that the Z value may become small. When it exceeds 3000 ppm, the frictional force is excessively reduced, and when the bag is made, the opening between the inflated part and the non-inflated part is easily opened, the airtightness of the sewn part is impaired, and the combustibility falls within the specifications. It may not be maintained. Here, the surface refers to the surface of the single yarn that constitutes the fiber.

  As a method for adhering the above-mentioned treatment agent to the surface of the single yarn constituting the fiber, it is applied by providing an oiling roll at the spinning stage or warp preparation time, or by dipping before the heat setting step. Further, the applying step can be applied by dividing one of the above-mentioned steps or some steps. Examples of the substance to be attached include polyolefins such as polyethylene and polypropylene resin, and fatty acid esters such as dibasic acid and monohydric alcohol or polyhydric alcohol and monobasic acid ester, or polyhydric alcohol and dibasic acid. As the ester or silicone resin, dimethyl silicone or a modified product thereof can be used. The form to be applied may be an organic solution such as a hydrocarbon, an aqueous solution, or an emulsion, but water is preferably used and the emulsion is most preferable in terms of process safety. As the thermoplastic fiber, one selected from the group consisting of polyamides and polyesters is suitable because it is well balanced in cost and physical properties. In particular, nylon 66 and polyethylene terephthalate fiber can be preferably used, and nylon 66 is most preferable in consideration of heat resistance, frictional characteristics, and high elongation. The fiber is obtained by obtaining a multifilament by melt spinning, cooling, applying an oil agent, stretching with a hot roll, and confounding with pressurized air.

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

  It is more preferable that the fineness of both the warp yarn and the weft yarn constituting the base fabric of the present invention is 300 to 800 dtex. When it is 300 dtex or more, the flexibility is improved and the storability is further improved. Further, if it is 800 dtex or less, the density is small, which is more advantageous in productivity. More preferably, it is 400 to 700 dtex.

  The airtightness can be better maintained when the withdrawal resistance value of the yarn constituting the woven fabric of the present invention is 20 to 150 N / cm / cm. 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 flexibility and tear strength work advantageously. On the other hand, if it is 150 N / cm / cm or less, the friction between the warp and weft yarns becomes large, which is advantageous for maintaining the airtightness of the sewn portion. The pull-out resistance in this range is preferably weaving with a warp tension of 0.22 cN / dtex or more, but if the tension is raised too much, fluff may occur due to the heddle or the reed, and the number of inserts per reed It is necessary to devise materials, shapes, etc. for the temples and heddle. To prevent loosening of the ears, the same type and / or different type of yarn as the ground yarn of the woven fabric is applied to both ends of the woven base fabric of the present invention. For example, entanglement yarn and strength 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. When it is 2.5 or more, the effect of thickness is advantageous in heat resistance. When it is 5 or less, flattening proceeds, which is advantageous for flexibility and airtightness. To achieve the above value range, it is preferable to weave with a warp tension of 0.25 cN / dtex or more, but if the tension is excessively increased, fluff may occur due to the heddle or the reed, and it is necessary to balance the fluff. However, if the number of single yarns is increased, the weaving tension may be lowered in some cases.

  When manufacturing the woven base fabric of the present invention, it is preferable to use the entwined yarn and the additional yarn for quality improvement. The entanglement thread is placed at the end of the most cloth material to prevent fraying and loosening of the ears. The entangled yarns are usually woven into a woven fabric by a leno device at both ear portions in pairs. When a monofilament of 15 to 100 dtex is applied, the selvages of the selvages are well tightened, and the sagging of the selvages and the flare and warp density variations caused thereby can be effectively reduced. If the entangled yarn is 15 dtex or more, the tightness of the ears is particularly good, and if the entangled yarn is 100 dtex or less, the yarn is a moderately thick yarn, so that the handling is easy.

  Furthermore, if two or more yarns called additional yarns are present on one side between the piece of anti-textile material and the two end-entangled threads, it is more effective for preventing loosening of the article. This is supplied from another yarn feeder. It is preferable that four or more total left and right additional yarns having a fineness of 20 or more and less than 100 dtex are woven between the entangled yarn and the ground yarn at both ends of the cloth. As the additional yarn, a monofilament, a crimped yarn, a spun yarn, and a yarn of the same kind 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 height of the ears of the product roll. A plain weave design is generally adopted for the additional yarn portion, but the additional yarn portion can be changed depending on the state of the selvage portion and is not particularly limited.

  As the weft inserting mechanism of the loom used for weaving the woven base fabric of the present invention, general devices such as rapier, water jet, air jet, shuttle, and projectile can be selected.

In the set process for obtaining the woven 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 fixing furnace such as a tenter, or a method of omitting the tenter can be selected. When heat-fixing, a method is generally used in which tension is applied in the longitudinal direction due to the difference in moving speed between the supply roll and the in-furnace fixture. In the weft direction, for example, a method of fixing a pin or a clip, or a method of suppressing shrinkage in the weft direction only by friction between a furnace roll and a fabric can be adopted. Also for heating, a method of circulating electricity or gas-combustion heated air 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. When a tenter is used for heat setting, the following formula 4:
Tenter overfeed rate = (Vw−Vs) / Vs × 100
The tenter overfeed rate represented by {wherein Vs = supply speed (m / min) to the heating set machine after the refining of the refining product, Vw = internal speed (m / min) of the heating set after refining of the refining product} is −10. Adjusted to ~ 2%, and further the following formula 5:
Tenter width change rate = (Dw-Ds) / Ds * 100
{In the formula, Ds = the width (mm) of the supplied cloth to the heating set machine after the refining of the cloth, Dw = the width of the cloth inside the heating machine after the refining of the cloth (mm)}, the rate of change of the tenter width, which is −10 By adjusting in the range of about 2%, it is possible to obtain a high-quality base cloth having a small density distribution.

Further, without using a heating set machine such as a tenter, only drying may be performed as it is after refining. In this case, the following equation 6:
Refining overfeed rate = (Sw-Ss) / Ss * 100
The refining overfeed rate represented by {In the formula, Ss = supply speed (m / min) of the cloth to the refining machine, Sw = winding speed (m / min) of the cloth) is about -15 to 0%. Preferably.

  When the woven base fabric according to the present invention is wound into a roll, the diameter ratio of the roll center part to the end part is 7%, that is, the ratio of the diameter D of the roll center part to the diameter d of the roll end part. It is preferable that d / D is less than 1.07. By setting the content to be less than 7%, it is possible to obtain a high-quality piece of fabric with less wrinkles on the ears of the product, and to produce a product with a lower risk of damage such as the ears of the article rub against the floor surface or packaging material during roll transport. be able to.

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

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.
First, various measuring 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 fiber density was measured by a density gradient tube.
(3) Base cloth weight: 10 cm square was cut out at 3 points, measured with an electronic balance to three decimal places, and determined as the weight per 1 m ² from the average.
(4) Base fabric density: Five points were measured for each of the warp and weft using FX3255 manufactured by TEXTTEST, and the average was taken as the density.
(5) The tenacity and the 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 weft replacement was excluded.
(8) The cloth residual silicon resin adhesion amount was calculated by soxhlet extraction of the base cloth with normal hexane, the extract was dried, and the residue was calculated from the silicon atom content by fluorescent X-ray analysis.
(9) The amount of the residual olefin resin adhered to the base cloth was calculated by soxhlet-extracting the base cloth with normal hexane, drying the extract, and separating the residue with GPC.
(10) In the case where the base cloth residual ester was adhered alone, the base cloth was subjected to Soxhlet extraction with normal hexane, the extract was dried, and the weight thereof was calculated. When mixed with silicone and / or olefin resin, the total amount was measured by Soxhlet extraction, and then the respective amounts were subtracted.

(11) The width and thickness of the fibers constituting the base cloth were measured by using a high resolution X-ray microscope nano3DX manufactured by Rigaku, generating X-rays with an X-ray target of Cu and a tube voltage of 40 kV / 30 mA, and photographing the sample. I asked.
(12) The pull-out resistance value was obtained by making a pull-out resistance measurement sample (sample) shown in FIG. 1 and measuring it at three locations in the width direction at a speed of 10 mm / min with A & D Tensilon.
P = F (Dx / 2.54) / (15 × 2.54 / Dy)
{In the formula, P = pulling resistance (N / cm / cm), F = pullout measurement value (N), Dx = weaving density in the measuring direction (books / inch), Dy = weaving density in the direction orthogonal to the measuring direction (Book / inch)}.
(13) Weaving density: FX3255 manufactured by TEXTEST was used.
(14) Aeration amount of base cloth; measured using an FX3350 manufactured by TEXTEST Co., Ltd. using a 400 cc tank at an initial pressure of 170 kPa, and an average dynamic air amount of 30 kPa to 70 kPa.
(15) Seam ventilation amount: Two pieces of fabric having a length of 38 cm and a width of 15 cm are cut out from the woven fabric, and sewn with a sewing thread made of a twisted yarn of 1350 dtex with 50 stitches / dm of the main stitch, and both ends of the thread are tied. This was sewn by aligning warp directions of the fabric and aligning weft directions to prepare a sample for weft. After that, in a Tensilon manufactured by A & D Co., a chuck width was sandwiched by 60 mm, a load of 1500 N was applied at a speed of 100 mm / min, the tension was once released, and the mixture was left for 3 hours. This sample was measured with an EX3350 manufactured by TEXTEST Co., Ltd. using a 400 cc tank at an initial pressure of 300 kPa, and an average dynamic air flow rate of 30 kPa to 70 kPa was measured.

(16) Roll shape index (d / D): A diameter D at the center of the roll and a diameter at the end of the roll were measured and calculated.
(17) Bag development evaluation: A bag having a width of 8 cm and a length of 10 cm and a gas inlet of 30 cm and having a diameter of 30 cm was sewn with a stitching thread made of a twisted yarn of 1350 dtex with a stitch of 65 needles / dm. The bag shown in FIG. 2 was manufactured by reversing this inside and out. Using a 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 inch, and a tank capacity of 250 cc. The most open portion of the seam portion was visually measured, and 3 mm or less was evaluated as small, 3 to 6 mm as medium, and 6 mm or more as large.

[Example 1]
Polyamide 6.6 resin was melt-spun at 300 ° C, 0.8% of spinning oil was added to the fiber while cooling, and then stretched 4.9 times by a hot stretching roll at 200 ° C, and compressed air was used. After the entanglement, a yarn having a fineness of 470 dtex and a filament number of 136 was obtained. The strength of the raw yarn was 8.56 cN / dtex and the elongation at break was 21%. Using this raw yarn, with a weft width of 2.3 m of LWT710 manufactured by Toyota Industries Corporation without sizing, warp density 45.2 yarns / inch, weft set density 44 yarns / inch, fabric width 230 cm, warp tension 0. Plain weaving was performed at 32 cN / dtex and a loom rotational speed of 600 rpm. The weft insertion device used was a type that was inserted only by free flight. 22dtex nylon 66 monofilament, two on each side, were used as entwined yarns for both ears. As the additional yarn, 22 dtex nylon 66 monofilament was used as a plain weave by using two twin yarns on each side between the entangled yarn and the ground yarn. Then, in an 80 ° C. water bath, the overfeed rate during refining was set to −10% under a tension of 400 N for 60 seconds, then immersed in a silicone resin emulsion having a solid content of 1500 ppm, and then a tenter overfeed was performed with a pin tenter. The target non-coated base fabric was obtained at 4%, a tenter width setting rate of -2%, and a heat setting temperature of 180 ° C. About this base cloth, weaving density, number of stops during weaving, thickness and width of constituent threads, tensile strength / elongation of base cloth, pullout resistance, bending resistance, ventilation after seam opening, roll shape, bag expansion test Then, the results shown in Table 1 below were obtained.

[Example 2]
Using the same yarn as in Example 1, the same silicone resin emulsion as in Example 1 adjusted to a solid content concentration of 3.0% was applied with a touch roll over time. The contact length between the touch roll and the warp was set to 30 mm, the yarn speed was set to 100 m / min, and the roll speed was set to 15 rpm to prepare the warp, and a weaving machine was obtained under the same weaving conditions as in Example 1. Then, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds, at a refining overfeed rate of −10% at that time, and dried at 110 ° C. for 60 seconds on a drying drum to obtain a target base fabric. It was This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

[Reference Example 3]
Polyamide 6.6 resin is melt-spun at 300 ° C., while adding 0.8% of a spinning oil agent to the fiber while being cooled, it is then stretched 4.7 times by a hot stretching roll at 200 ° C. and compressed air is used. After the entanglement, a 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 set to 0.36 cN / dtex using this raw yarn. Then, the mixture was treated at a refining overfeed rate of -6% without passing through a refining tank, and dried at 110 ° C for 60 seconds on a drying drum to obtain a target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

[Reference Example 4]
The same weaving conditions were used except that the same warp beam as in Example 2 was used and the warp tension during weaving was 0.22 cN / dtex. The post-processing was carried out in the same manner as in Reference Example 3 to obtain the target base fabric. The results of evaluating this base cloth in the same manner as in Example 1 are shown in Table 1 below.

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

[Reference Example 6]
The same yarn as in Example 1 was used, and the warping was the same as in Example 2 except that a polypropylene resin was added. Using this warp beam, weaving was performed in the same manner as in Example 2, and the post-processing was performed in the same manner as in Reference Example 3 to obtain the target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

[Reference Example 7]
The target base fabric was obtained under the same weaving and processing conditions as in Reference Example 6 except that the fiber was changed to polyethylene terephthalate. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

[Reference Example 8]
Using a yarn similar to that in Example 1, a warp beam was produced without applying resin or the like during warp warping and weaving was performed under the same conditions as in Example 1. This was post-processed in the same manner as in Reference Example 3 to obtain the target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

[Reference Example 9]
Using a yarn similar to that in Example 1, a warp beam was produced without applying resin or the like during warp warping and weaving was performed under the same conditions as in Example 1. This was post-processed under the same conditions as in Example 2 to obtain the target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

[Reference Example 10]
Polyamide 6.6 resin was melt-spun at 300 ° C., a spinning oil was added to the fiber at 0.8% while cooling, and then stretched 4.9 times by a hot stretching roll at 200 ° C., and compressed air was used. After the entanglement, a yarn having a fineness of 235 dtex and a filament number of 36 was obtained. The strength of the raw yarn was 8.90 cN / dtex and the elongation at break was 21%. A warped beam was obtained under the same conditions as in Example 2 except that this yarn had a warp density of 65 yarns / inch. This was woven under the same conditions as in Example 1 except that the weft density was 66 threads / inch. The post-processing was performed under the same conditions as in Reference Example 3 to obtain the target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were 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. The post-processing conditions were the same as in Reference Example 3 to obtain the desired woven fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 1 below were obtained.

  The product within the range of the invention [1] was able to achieve both flexibility and airtightness, and a base fabric in which the opening of the bag was suppressed even after the bag was developed was obtained.

[Comparative Example 1]
Polyamide 6/6 resin was melt-spun at 300 ° C., 0.8% of a spinning oil was added to the fiber while cooling, and then stretched 4.85 times with a hot stretching roll at 200 ° C. and compressed air. After the entanglement, a yarn having a fineness of 470 dtxex and a filament number 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 warped and woven in the same manner as in Example 2, and the post-processing was performed in the same manner as in Example 3 to obtain the target base fabric. The same evaluation as in Example 1 was performed on this base fabric, and the results shown in Table 2 below were obtained. In Comparative Example 1, the Z value was reduced by using the yarn having a large single yarn fineness, and the result was that the airtightness could not be maintained. In addition, a burst occurred when the bag was deployed.

[Comparative example 2]
Polyamide 6/6 resin was melt-spun at 300 ° C., 0.8% of spinning oil was added to the fiber while cooling, and then stretched 4.75 times with a hot stretching roll at 200 ° C. and compressed air. After the entanglement, a yarn having a fineness of 155 dtxex and a filament number of 136 was obtained. The strength of the raw yarn was 8.1 cN / dtex and the elongation at break was 25%. Three of these yarns were combined to form 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 in Example 2 was carried out to obtain the target base fabric. The same evaluation as in Example 1 was performed on this base fabric, and the results shown in Table 2 below were obtained. This base fabric was a stop at the time of contact due to a small single yarn fineness, and the obtained base fabric had a large Z value and had a low degree of tear due to lack of fiber freedom. This deployment test caused a burst.

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

[Comparative Example 4]
Using the same yarn as in Example 1, an aqueous solution containing 1% of a linear alkyl sulfate was applied in place of the resin emulsion after aging and the warp was wound. The yarn was subjected to the same weaving and post-processing as in Example 2 to obtain an intended base fabric. The amount of esters remaining in the obtained base cloth was 20 ppm. The same evaluation as in Example 1 was performed on this base fabric, and the results shown in Table 2 below were obtained. In Comparative Example 4, there were many weaving stops, the resulting base fabric also had a 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 threads / inch. Using this warp, a weft density design was 53 yarns / inch, and 22 dtex nylon 66 monofilaments were used as entwined yarns at both ears, two on each side. As the additional yarn, 22 dtex nylon 66 monofilament was used as a plain weave by using four filaments on each side between the entangled yarn and the ground yarn. Then, the same post-processing as in Reference Example 3 was carried out to obtain the target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 2 below were obtained. Under this condition, the weave density was excessively high, and the base fabric had a very high bending resistance.

[Comparative Example 6]
Using the same yarn as in Example 2, the same warping was performed except that the warp density was 38 threads / inch. Using this warp, the weft density was set to 39 yarns / inch, and the weaving was performed under the same conditions as in Example 2 except for that, and the processing was performed under the same conditions as in Reference Example 3 to obtain the target base fabric. This base cloth was evaluated in the same manner as in Example 1, and the results shown in Table 2 below were obtained. Under this condition, since the weaving density was too low, the airtightness was impaired, and burst of the produced bag was observed.

  As is clear from Comparative Examples 1 to 6, the products outside the scope of the invention [1] cannot maintain the airtightness of the seam part when the load is applied to the seam, or the tear strength is lowered. It was confirmed that the problem could not be achieved because the bag produced had bursts and the base fabric was hard.

  INDUSTRIAL APPLICABILITY The woven base fabric according to the present invention can be suitably used as a base fabric for an airbag, which has high airtightness, flexibility, excellent storability, and high productivity.

Claims (7)

A woven fabric base cloth woven from thermoplastic resin warp threads and weft threads having a circular cross section with a single yarn fineness of 1.5 or more and 4 dtex or less, and the following requirements:
(1) The following formula 1:
Z = (Ww x Dw + Wf x Df) -50.8
Z value represented by {Ww = maximum width of warp ( mm ), Dw = warp density (thread / inch), Wf = maximum width of weft ( mm ), Df = weft density (thread / inch)} is 0 ~ 7;
(2) The following formula 2:
Q = q / S
{Wherein q = ADAP (mm / s) between 30 and 70 kPa measured by ASTM_D6476, S = base fabric weight (g / m ² )}, and the Q value is 0.5 to 2.5. is there;
(3) The following formula 3:
CF = ((Tw / ρ) ^0.5 × Dw) + (Tf / ρ) ^0.5 × Df)
The cover factor (CF) represented by {wherein Tw = warp yarn fineness (Dtex), Tf = weft yarn fineness (Dtex), ρ = fiber density (g / cm ³ )} is 1984 to 2050 ;
(4) Silicone resin is present on the fiber surface of the woven base fabric at 60 to 1100 ppm based on the weight of the fiber;
(5) The warp tear strength of the base fabric is 210 N or more;
(6) The weft tear strength of the base fabric is 205 N or more;
(7) The value obtained by dividing the width of the warp constituting the base cloth by the thickness is 2.5 to 5;
(8) The value obtained by dividing the width of the weft constituting the base cloth by the thickness is 3.1 to 5; and (9) the air permeability of the base cloth is 280 mm / s or less;
The woven base fabric satisfying the above.   The woven base fabric according to claim 1, wherein the warp yarns and the weft yarns each have a fineness of 300 or more and less than 800 dtex.   The woven fabric base fabric according to claim 1 or 2, wherein the warp yarns and the weft yarns constituting the woven fabric fabric fabric each have a pull-out resistance value of 20 to 150 N / cm / cm.   The fabric of the woven fabric according to any one of claims 1 to 3, wherein yarns having a fineness of 20 or more and less than 70 dtex other than the ground yarn are left and right between the entangled yarn and the ground yarn at both ends of the fabric. The said piece of cloth is characterized by being woven in total of four or more.   It is a cloth roll of the textile base fabric according to any one of claims 1 to 3, and ratio d / D of diameter D of the roll central part and diameter d of the roll end is less than 1.07. The said thing cloth roll characterized by the above-mentioned.   A non-coated airbag made of the base fabric according to claim 1.   A method for manufacturing a non-coated airbag, comprising the step of using the piece of fabric according to claim 4 or the piece of fabric roll according to claim 5.

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