JP2006124859A - Stock yarn package for air bag, and substrate cloth for air bag by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate cloth for an air bag, woven by an air-jet loom, having an excellent quality especially as the substrate cloth for an inflatable curtain airbag and having a wide width capable of being cut efficiently, and also a stock yarn package for the airbag, excellent in interlacing characteristics suitable for producing the substrate cloth. <P>SOLUTION: This package of the stock yarn for the air bag is provided by winding the stock yarn having 12-30/m number of interlaces (I) and 3-15% unevenness (CV value) of the number of interlaces, and the maximum value and minimum vale of the number of interlaces in the package satisfy a specific relationship. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air bag yarn package and an air bag base fabric using the same. Specifically, it is possible to obtain a high-quality airbag base fabric that is excellent in weaving properties and has few defects in the base fabric such as weaving spots, and is particularly suitable for air jet loom weaving. The present invention relates to an airbag base fabric suitable for an inflatable curtain airbag.

  With the improvement of traffic safety awareness, the rate of airbag installation is increasing year by year from the standpoint of passenger protection, and driver and passenger airbags are generally standard on new vehicles. In addition to the conventional driver and front passenger airbags, side airbags and knee airbags have also been improved, and recently, airbags for protecting passengers in the event of a collision from the side. Installation is progressing rapidly.

  The airbag for protecting the head of the occupant when the vehicle rolls over mainly due to a collision from the side is called an inflatable curtain airbag. An inflatable curtain airbag is composed of a gas generator connected to a sensor that senses when a side collision or rollover, and an airbag connected to the gas generator. It has become.

  Driver airbags and passenger airbags are designed to release gas so as to instantaneously lower the internal pressure to absorb the impact between the human body's face and the bag, after the bag is deployed in the event of a collision. . Degassing after the deployment of the bag is performed by controlling the air permeability of the bag base fabric by using a vent hole in a coated airbag and by using a non-coated airbag. On the other hand, the inflatable curtain airbag is designed so that the inner pressure is maintained for several seconds to 10 seconds after the bag is deployed, and the bag becomes a cushion to protect the occupant even if the vehicle rolls over. That is, the surface of a high-density woven fabric that has a sufficiently low air permeability even in a non-coating state that is usually sewn into a bag or bag shape is coated with an elastomer resin to further improve airtightness.

  Conventionally, water jet loom weaving has been most preferably used for the base fabric of driver and passenger airbags. However, in order to effectively cut the long and complicated pattern of the inflatable curtain airbag from the base fabric, the wider the fabric width, the more advantageous. That is, air jet loom weaving capable of wide weaving is being applied in place of the conventional water jet loom because it has good weaving efficiency.

  In order to take advantage of these air jet loom weaving and to obtain a highly efficient and high-quality airbag fabric, the number of weaving stops and the occurrence of fabric defects are reduced more than required so far. Although there is a need for higher quality air bag yarns, these objectives have not yet been fully achieved.

  Many technologies have been proposed for the purpose of satisfying various characteristics required for airbags such as storage and low ventilation performance, as well as for obtaining high-efficiency and high-quality airbag fabrics. Recently, however, there are many proposals focusing on confounding.

  For example, for non-coated airbags that can be processed into woven fabrics without adversely affecting the woven fabric properties that are required at a low cost, and the woven fabrics produced therefrom have improved especially in terms of foldability and flexibility As a method for obtaining a woven fabric, a technique in which the yarn has an opening length of 2 to 10 cm, and coefficients K1 and K2 relating to the stability of the entanglement point of the yarn are 0.6 or more and 0.3 or more, respectively (for example, Patent Document 1) has been proposed.

  In addition, as a method of obtaining a high-quality coated airbag by uniform coating without impairing the weaving efficiency, both the diameter of the entangled portion and the variation of the diameter of the unentangled portion are expressed by CV values. Technology of adjusting the number of entanglement to 5 / m or less after applying a tension of 2.2 cN / dtex in a wet state to a entangled yarn having a number of entanglement of 15 to 60 / m. For example, see Patent Document 2).

According to these conventional techniques, the processability in the case of weaving using a water jet loom is certainly improved, and a higher quality airbag base fabric can be obtained, but the air jet loom was used. It is not always suitable for weaving, and even a non-coated base fabric has a sufficiently low air permeability and is not a satisfactory technique for enabling a uniform coating.
JP-A-8-31733 JP 2001-288638 A

  The present invention has been accomplished as a result of studying the solution of the above-described problems in the prior art, and provides a high-quality airbag fabric having excellent weaving properties and few fabric defects such as weaving spots. In particular, it is an object of the present invention to provide an air bag yarn package suitable for air jet loom weaving, and an air bag base fabric suitable for an inflatable curtain air bag using the same.

In order to achieve the above object, according to the present invention, in a package in which a raw yarn having an entanglement number (I) of 12 to 30 / m and a variation (CV value) of the entanglement number of 3 to 15% is wound up And the maximum value (I _MAX ) and the minimum value (I _MIN ) of the number of confounding (I) in the package satisfy the relationship of the following formulas (A) and (B) at the same time: A raw yarn package is provided.
I _MAX −I _MIN ≦ 3 (pieces / m) (A)
(I _MAX -I _MIN ) / ((I _MAX + I _MIN ) / 2) ≦ 0.16 (B)

In the air bag yarn package of the present invention,
The difference between the maximum value and the minimum value of the number of entanglements in any continuous 5000 m of the wound raw yarn is 2.5 pieces / m or less,
The difference between the maximum value and the minimum value of the number of entanglements in 3000 m from the start of winding of the wound raw yarn is 2 / m or less, and the total fineness of the raw yarn is 200 to 700 dtex, and the number of single yarns is 30 to 30 It is preferable that 250 bottles have a boiling water shrinkage of 5 to 10% and an amount of adhered oil of 0.5 to 1.5% by weight, and an excellent effect is expected by applying these conditions. can do.

Further, the airbag fabric of the present invention uses the yarn obtained by unwinding from the airbag yarn package described above as warp yarn and weft yarn, or weft yarn, and the following formula (C): The cover factor (K) shown is woven in the range of 1800-2700.
K = Nw × (0.9Dw) ^1/2 + Nf × (0.9Df) ^1/2 (C)
Nw: Warp yarn density (lines / inch)
Dw: Warp yarn fineness (dtex)
Nf: Thread density (lines / inch)
Df: Weft fineness (dtex).

Furthermore, in the airbag fabric of the present invention,
Being woven by an air jet loom,
It is preferable that the coating base fabric is coated with an elastomer resin selected from a silicone resin, a polyurethane resin, and a polychloroprene rubber, and that it is for an inflatable curtain airbag. By applying these conditions, a further excellent effect can be expected.

  According to the present invention, as will be described below, it is possible to provide a high-quality airbag base fabric having excellent weaving properties and less base fabric defects such as weaving spots, and is particularly suitable for air jet loom weaving. A raw yarn package is obtained.

  Further, according to the present invention, it has excellent quality as a base fabric for airbags, particularly an inflatable curtain base fabric that could not be achieved by the prior art, and is woven by an air jet room. A wide airbag fabric capable of efficient cutting can be obtained.

Hereinafter, the present invention will be described in detail.

The air bag yarn package of the present invention is a package in which the yarn having the entanglement number (I) of 12 to 30 / m and the entanglement number variation (CV value) of 3 to 15% is wound, In addition, the maximum value (I _MAX ) and the minimum value (I _MIN ) of the number of confounding (I) in this package must satisfy the following expressions (A) and (B) simultaneously.

  In the manufacture of a normal yarn for an airbag, immediately before winding the yarn, high-pressure air is jetted from a substantially perpendicular direction to the running yarn so that the yarn is entangled and converged. The yarn bundled by the yarn entanglement process can be warped and woven without the twisting step and the gluing step. The variation in the number of entanglements in the conventional yarn for an airbag is relatively small between the teeth, and the variation in the length of the yarn, that is, the length of the yarn is large. In general, the smaller the number of entanglements, the greater the variation CV value (%) of the number of entanglements, and the smaller the number of entanglements, the smaller the CV value. Such a portion having a small number of entanglements and a large CV value is woven with the yarn loosened, particularly when it is driven as a weft yarn, and appears as unevenness of a living machine. This phenomenon was rarely seen when weaving with a conventional water jet room, and is particularly noticeable when weaving in an air jet loom.

  When weaving with a water jet room, the entanglement of the weft is almost undissolved by the unwinding tension, the length measurement during weaving and the resistance of the water flow during weft driving, and the residual entanglement of the base fabric is approximately 0-5. About m / m. Moreover, when weaving with water jet yarn, the warp and weft yarns absorb water and are entangled due to distortion caused when wound on the teeth, such as distortion caused by changes in winding tension. It was possible to mitigate the influence on the weft flying performance due to the change in properties.

  However, in the air jet room, the flying property of the weft yarn is greatly influenced by the entanglement characteristics, and the portion where the length of opening is long and the converging property of the yarn is low, that is, the portion where the number of entanglement is small, becomes easier to fly. Therefore, when the variation in the entanglement of the raw yarn is large, it becomes difficult to control the flying performance to a certain level, and a part of the weft yarn is driven in a state of being folded more than double, and as a weaving spot of the raw machine Will be brought in. In particular, since the whole yarn including the outermost layer portion from the innermost layer portion of the seed is used for the weft yarn, the portion with little entanglement becomes woven spots, and a high-density fabric having sufficient low air permeability cannot be obtained. In addition, if the base fabric is subjected to resin processing, it becomes a resin adhesion spot, which is an obvious defect and cannot be a product. Moreover, since the resulting weaving spots are difficult to detect at the raw machine stage, it has been difficult to minimize damage.

  In the yarn package for airbag of the present invention, the entanglement number (I) of the yarn needs to be 12-30 pieces / m, preferably 15-25 pieces / m, more preferably 17-23. Pieces / m. If the number of entanglements is less than 12 / m, the yarn will be less converged, causing yarn cracking in the warping process and weaving process, making it easier to generate fluff by catching on guides, etc. and stopping the weaving process And the quality of the base fabric is also inferior. Furthermore, the variation in the number of entanglements tends to increase beyond the range of the present invention, and it becomes difficult to suppress the weave spots. On the other hand, when the number of entanglements exceeds 30 / m, entanglement is generally formed with high strength of the entanglement part, so that entanglement remains not only through normal warping and weaving process but also through scouring process. In many cases, especially when using an air jet loom where weft untangling is difficult during weaving, entanglement tends to remain. In such a case, since the resin coating is applied to the base fabric with the entanglement remaining, the coating base fabric is not smooth and the amount of resin to be applied increases. Become. Further, the single yarn tarmi increases, the number of stops during weaving tends to increase, and more air is required to fly the weft yarn.

  In the airbag yarn package of the present invention, the variation in the number of entanglements (CV value) needs to be 3 to 15%, preferably 3 to 10%, more preferably 3 to 8%. is there. It is very difficult to obtain a entangled yarn having a CV value of less than 3% with the current technology. If the CV value exceeds 15%, weft unevenness occurs as described above, which is not preferable.

Furthermore, in the airbag yarn package of the present invention, the maximum value (I _MAX ) and the minimum value (I _MIN ) of the number of entanglement in the entangled yarn in one yarn package are the above formulas (A) and (B ) Is not satisfied at the same time, the flight where the number of confounding and its variation changes tends to be unstable. In the current automatic air pressure adjusting device for driving the weft yarn, it is difficult to always drive the weft yarn with a constant flying ability, and this is likely to cause weaving. The above formulas (A) and (B) mean that the entanglement is uniform in the longitudinal direction in the raw yarn package. If it is difficult to give a large amount of confounding due to the fact that the single yarn fineness is thick, etc., by making the change in the number of confounding in the cheese smaller, it becomes easier to control the air pressure at the time of placing the weft, The effect of the present invention can be exhibited by stabilizing the yarn flying property.

  In the airbag yarn package of the present invention, it is preferable that the difference between the maximum value and the minimum value of the entanglement number in the continuous 5000 m of the wound yarn is 2.5 pieces / m or less. More preferably, it is 1 piece / m or less. If the difference between the maximum value and minimum value of the number of confounding in any continuous 5000m changes more than 2.5 pieces / m, it depends on the weaving speed of weft, but weaving in a short time The control of the air pressure automatic adjustment function tends to be unstable, and as described above, the flying performance of the weft yarn becomes unstable and weaving tends to occur. is there.

  Furthermore, in the airbag yarn package of the present invention, it is preferable that the difference between the maximum value and the minimum value of the entanglement number in 3000 m from the start of winding of the wound yarn is 2 / m or less. More preferably, it is 1 piece / m or less. Usually, in winding the airbag yarn, when a predetermined amount is wound in a cheese shape by one spindle and the pipe is full, the automatic thread is automatically switched to the standby spindle side. In order to increase the switching success rate, normally, the initial winding speed is set to be higher than that in the steady state, and as a result, the tension is higher in the initial stage of winding than in normal winding. This winding tension is usually not completely separated from the tension of the yarn being entangled, so the high tension at the initial winding after switching is transferred to the yarn during the entanglement treatment, and the high tension Under the confounding process. Therefore, the yarns that run with a high initial tension after completion of the changeover of the teeth are hardly entangled, and the number of entanglements decreases. That is, conventionally, after switching, the average value of the initial number of entanglements is not only reduced to 30 to 80% as compared with normal winding, but also the variation in the number of entanglements has become extremely large. Moreover, the confounding provided was loosened and decreased. However, it has been found in the present invention that, by suppressing the change in the number of confounding yarns of the yarn and winding it, it is not necessary to make it substantially manifest as the weave spots of the airbag fabric. That is, it has been found that weaving spots do not appear in any of the raw machine, the base fabric after the scouring treatment, and the coat base fabric. When the difference between the maximum value and the minimum value of the number of entanglements in 3000 m from the beginning of the wound raw yarn exceeds 2 / m, the weft of the weft yarn becomes unstable as described above, and weaving spots This is not preferable because it tends to occur.

  The total fineness of the yarn wound around the airbag yarn package of the present invention is preferably 200 to 700 dtex, more preferably 235 to 550 dtex. If it is less than 200 dtex, it is difficult to obtain sufficient strength as a base fabric for an airbag. On the other hand, if it exceeds 700 dtex, the airbag fabric is likely to be thick and hard, and is not preferable particularly for an inflationable curtain.

  The number of single yarns wound on the airbag yarn package of the present invention is preferably 30 to 250, more preferably 40 to 200. When the number is less than 30, the fineness of the single yarn is large, which is not preferable because it becomes a bag that is hard and difficult to fold as an air bag base fabric, and it is difficult to give many entanglements. If the number exceeds 250, it will surely become a flexible airbag fabric, but it is difficult to stably produce an airbag yarn with high strength and less fluff with the current technology. The preferred single yarn fineness of the airbag yarn satisfying the preferred total fineness and the number of single yarns of the present invention is 1 to 7 dtex. More preferably, it is 2-5 dtex. For example, the total fineness and the number of single yarns are 235 dtex-36 to 108, 350 dtex-72 to 144, 470 dtex-72 to 144, 700 dtex-108 to 250, etc., and air having a fineness configuration suitable for base fabric design A bag yarn can be obtained.

  Moreover, it is preferable that the boiling water shrinkage | contraction rate of the raw yarn wound up by the raw yarn package for airbags of this invention is 5 to 10%, More preferably, it is 6 to 9%. If it is less than 5%, it is difficult to make a low-breathable base fabric having a sufficient weaving density for an inflatable curtain airbag. If it exceeds 10%, the fiber will have poor dimensional stability, making it difficult to handle, and it will be difficult to maintain a constant increase in tension during full-tube cheese switching. Since it becomes difficult to control the difference between the value and the minimum value within the preferable range of the present invention, it is not preferable.

  Furthermore, the amount of adhered oil of the entangled yarn wound on the airbag yarn package of the present invention is preferably 0.5 to 1.5% by weight, more preferably 0.7 to 1.2% by weight. If it is less than 0.5% by weight, it is difficult to stably produce an air bag yarn with less fluff. When the amount exceeds 1.5% by weight, the amount of oil remaining after refining increases, and adhesion with the coating resin is deteriorated, and the flying property of the weft is also unfavorably affected.

  In addition, the yarn wound around the airbag yarn package of the present invention preferably has a strength in the range of 6 to 10 cN / dtex, and more preferably 7 to 9 cN / dtex. If it is less than 6 cN / dtex, it is difficult to obtain sufficient strength as a base fabric for an airbag. On the other hand, although high-strength yarn exceeding 10 cN / dtex can be obtained, it is difficult for the current technology to stably produce a yarn with low fluff and good quality, which is important as a base fabric for airbags. is there.

  The synthetic fiber multifilament used in the air bag yarn package of the present invention is not limited to a material as long as it satisfies the entanglement characteristics specified in the present invention, but particularly nylon 66, nylon 6, nylon 46, etc. Polyamide fibers and polyester fibers such as polyethylene terephthalate and polybutylene terephthalate are preferable. In addition, a copolymer polymer or a blend polymer containing the above-mentioned respective polymers as main components can also be used.

  In addition, the single yarn cross-sectional shape of the synthetic fiber multifilament used in the airbag yarn package of the present invention is not particularly limited as long as it satisfies the entanglement characteristic of the present invention. Non-circular shapes such as Y-type, V-type, and flat type can also be used.

  The airbag base fabric of the present invention is obtained by using warp yarn and weft yarn or weft yarn unraveled from the above-described airbag yarn package specified above. A 2700 airbag fabric is preferred. More preferably, it is 2000-2400.

The cover factor (K) is the product of the woven fabric density and the square root of the fineness of the fiber yarn, and is obtained from the following equation (C).
K = Nw × (0.9Dw) ^1/2 + Nf × (0.9Df) ^1/2 (C)
Nw: Warp yarn density (lines / inch)
Dw: Warp yarn fineness (dtex)
Nf: Thread density (lines / inch)
Df: Weft yarn fineness (dtex)

  If the cover factor is less than 1800, the woven density is low, and therefore mechanical properties such as tensile strength, tear strength, burst strength, and low air permeability are inferior. In particular, in the case of bag weaving, the strength at the boundary of the bag portion becomes low and causes misalignment at the boundary portion, leading to inferior internal pressure retention performance, and may have a sufficient function as an inflationable curtain. Can not. On the other hand, a high-density fabric having a cover factor exceeding 2700 is not necessary as a coat base fabric. In this case, the base fabric is rather thick and hard, a compact inflation-flat curtain airbag cannot be obtained, a large amount of raw yarn is required, and weaving costs are also undesirable.

  In addition, the airbag fabric of the present invention preferably has an oil content of 0.3 to 1.5% by weight, more preferably 0.8%, at the stage of the raw machine woven with an air jet room. 4 to 1.2% by weight. This value is substantially the same as the amount of oil provided to the airbag yarn. In conventional water jet loom weaving, the oil adhesion amount is about 0.2% by weight or less, usually 0.05 to 0.1% by weight. This is because the oil agent drops into water during weaving. .

  As described above, it is particularly preferable that the warp yarn and the weft yarn unraveled from the airbag original yarn package of the present invention or the weft yarn is woven with an air jet room. As the air jet room, if the base fabric of the specified cover factor can be woven at a weaving width of 1 to 4 m and a rotation speed of 300 to 1000 rpm, the model is used. It can be used regardless.

  And the base fabric which refined the raw machine obtained as this invention base fabric for airbags has an oil content of 0.05 to 0.3% by weight, usually 0.08 to 0.6% by weight. Although the oil agent is washed away by scouring, the above oil remains because of the relatively high density base fabric. Even if the oil content of the base fabric woven with water jet room is not refined, it is usually 0.05 to 0.1% by weight, and when refined, it is 0.01 to 0.05% by weight. Is different.

The base fabric for an air bag of the present invention is coated with a resin elastomer or the like because it is mainly used for an inflatable curtain airbag. As the resin to be applied to the surface of the base fabric, a silicone resin, a polyurethane resin, a chloroprene resin, a nylon resin, or the like is used, and the use of a silicone resin is particularly preferable. The resin adhesion amount on the surface of the base fabric is 5 to 80 g / m ² , preferably 10 to 50 g / m ² . If the resin adhesion amount is less than 5 g / m ² , uniform resin adhesion is difficult. On the other hand, if it exceeds 80 g / m ² , the base fabric becomes thick and hard, which is not preferable.

  A raw machine woven by an air jet room using a raw yarn unraveled from the raw yarn package specified in the present invention, and a scoured base fabric and a resin coated coat base fabric have high strength. A base fabric that is flexible and compact when folded and excellent in quality, and is suitable for use in an inflation-flatable airbag.

  The airbag yarn package having specific entanglement characteristics suitable for the airbag fabric having excellent quality according to the present invention can be manufactured by the following method.

The usual method for manufacturing airbag yarns is to wind the yarns that have been spun, hot-drawn and relaxed into a tee, and entangle the yarns just before that to interlace the yarns. Call. Based on the design of the total fineness of the running yarn, the number of filaments, the single yarn fineness, the winding tension and the number of entanglements to be applied, the interlace device, the speed of the yarn passing through this device and the pressure air injected Set the flow rate and process. At this time, the number of entanglements (I) in the length direction of the yarn wound around the paper tube or the like is 12 to 30 / m, and the variation (CV%) at that time is 3 to 15%. The maximum value (I _MAX ) and the minimum value (I _MIN ) of the number of confounding simultaneously satisfy the relationship of the following formulas (A) and (B).
I _MAX −I _MIN ≦ 3 (pieces / m) (A)
(I _MAX -I _MIN ) / ((I _MAX + I _MIN ) / 2) ≦ 0.16 (B)

  However, the winding tension increases when the winding amount of the yarn reaches a full tube and is switched to a new paper tube, etc., but at this time the tension of the yarn passing through the entanglement processing device also increases, so the number of entanglement decreases. To do. In the conventional method, both the number of entanglements and the variation in the number of entanglements are easily out of the above range, and it is very difficult to satisfy the expressions (A) and (B), the expressions 1 and 2 at the same time. And weaving spots are produced in the woven machine.

  However, a raw yarn package that does not cause weaving even when weaving with the air jet room of the present invention can be manufactured by the following method.

  That is, the tension at the time of steady winding is set so high that the appearance of the cheese is not impaired, and the number of revolutions of the winding spindle is changed while detecting the tension so that the tension is as set. At this time, the tension may be set to be always constant, or if the difference between the maximum value and the minimum value of the number of entanglements and the number of entanglements in the obtained package falls within the specified range of the present invention, Winding may be performed while changing the tension. In addition, when winding while greatly changing the tension so as to affect the entanglement characteristics, the flow rate of the jet pressure air of the interlace applying device is changed in conjunction with the tension, so that the yarns in the resulting yarn package can be changed. The entanglement number and the difference between the maximum value and the minimum value of the entanglement number may be the prescribed range of the present invention. However, it is preferable to set the traverse fluctuation at the time of winding, the fluctuation of the traverse angle, etc. to be the minimum in order to suppress the tension fluctuation in an extremely short time.

  Next, when switching the paper tube when the cheese is full, the following two methods or a combination of the following two methods can be used to obtain the airbag yarn package of the present invention.

  The first is to perform the switching at the same tension value as the steady winding tension without increasing the winding tension when switching the paper tube. In this case, the steady winding tension measured at a position of 5 to 20 cm after passing through the confounding device is set so as to be about 0.15 to 0.20 cN / dtex so that the switching success rate does not decrease. It is preferable to keep it. In addition, in order to achieve stable switching even with a tension lower than the winding tension at the time of conventional paper tube switching, the paper tube used is subjected to processing such as embossing, etc., and has a large friction coefficient with the yarn Is preferably used.

  Secondly, the increase in the winding tension at the time of switching the paper tube is suppressed to within 40% of the steady winding tension, or the increase in the winding tension is corrected so that the number of entanglement processing devices is equalized so that the number of entanglements becomes equal. Increase the flow rate of the pressure air to be injected. The flow rate of the pressure air to be corrected is changed in conjunction with the increase of the winding tension so as to satisfy the relational expression obtained in advance. It is possible to change the flow rate of the pressure air while detecting the winding tension, or to change the flow rate of the pressure device by setting a timer to set the tension up time when winding the full tube. This method can be adopted.

  The warp yarn and the weft yarn, or the weft unraveled from this package, using the original yarn package for an airbag of the present invention having the above-mentioned number of entanglement, variation in the number of entanglement (CV value), and even the number of entanglement in the longitudinal direction of the fiber By weaving the yarn with a normal air jet room, the base fabric for an airbag of the present invention, that is, a living machine can be obtained. As an air jet room, for example, JAT610 manufactured by Toyoda Automatic Loom Co., Ltd. is used. Both weft and warp have a density of 65 dft N66 fibers of 350 dtex, a weaving width of 3.4 m, and a rotational speed of 550 m / min. It can be woven under certain conditions.

  Silicone resin, polyurethane resin, chloroprene resin, nylon resin, etc. are used as the elastomer resin applied to the surface of the airbag fabric of the present invention, and silicone resin is particularly preferable.

  As a method of coating the elastomeric resin on the surface of the base fabric, the base fabric is immersed in a resin solution tank, and then the excess resin is removed and homogenized using a mangle, vacuum, or coating knife. A method of spraying resin using a spray device or a forming device can be employed. In particular, a knife coating method using a coating knife is preferable in that the resin can be applied thinly and uniformly.

  The air bag base fabric of the present invention thus obtained has excellent quality especially as an inflatable curtain airbag base fabric, and is woven by an air jet room to enable efficient cutting. Wide base fabric. In addition, according to the present invention, it is possible to provide an air bag yarn package excellent in entanglement uniformity, which is suitable for manufacturing the airbag fabric.

  The air bag yarn package and the air bag base fabric of the present invention are an inflatable curtain air as a raw yarn package having excellent entanglement uniformity in the longitudinal direction of the package and a coat base fabric having excellent quality. Of course, it can be applied to airbags other than bags, and can also be applied to tents, sheets, tarpaulins, heavy cloths, bags, and the like.

  Hereinafter, the present invention will be described in detail by way of examples. The definition of each characteristic and the measuring method in the present invention are as follows.

  (1) Total fineness: The positive fineness was measured by the method of JIS L1013 to obtain the total fineness.

  (2) Strength / Elongation: Measured according to the method of JIS L1013 under conditions of a test length of 25 cm and a speed of 30 cm / min.

(3) Boiling water shrinkage rate: Sampling the raw yarn in a crushed shape, adjusting the temperature in a temperature / humidity adjustment chamber at 20 ° C. and 65% RH for 24 hours or longer, and applying a load equivalent to 0.045 cN / dtex to the sample The thickness L ₀ was measured. Next, after immersing the sample in boiling water for 30 minutes in an unstrained state, the sample was air-dried for 4 hours in the temperature / humidity adjusting chamber, and a length L ₁ was measured by applying a load equivalent to 0.045 cN / dtex to the sample again. did. The boiling water shrinkage was calculated from the respective lengths L ₀ and L _{1 according} to the following equation.
Boiling water shrinkage = [(L ₀ −L ₁ ) / L ₀ ] × 100 (%)

  (4) Oil adhesion amount: The diethyl ether extract was measured by the method of JIS L1013 8.27 b) to obtain the oil adhesion amount.

  (5) Relative viscosity of sulfuric acid: 2.5 g of a sample was dissolved in 25 cc of 96% concentrated sulfuric acid and measured using an Ostwald viscometer at a constant temperature in a thermostatic bath at 25 ° C.

(6) Number of entanglements and variation in number of entanglements (CV value)
Noncontact optical measurement was performed using EIB-E manufactured by LAWSON-HEMPHILL. The measurement was carried out at a speed of 100 m / min by adjusting the hysteresis brake roll of the apparatus and the plate tensioner of the yarn feeding unit so that the tension at the CCD camera unit was 0.04 ± 0.01 cN / dtex. In addition, the attached ENTANGLEMENT software was used, and at this time, the threshold (VT) used for the confounding determination was set to (√ (total fineness)) × 5 by the variable threshold method, and the filter scan (FS) was set to 3. The number of entanglements used in the present invention is the above-mentioned measuring apparatus or measurement method, and the number of entanglements per meter is measured continuously for 100 m. The value obtained by dividing (σ) by the average value was defined as the variation in the number of confounding (CV value). All of these are automatically calculated as the measurement results of the ENTANGLEMENT software attached to EIB-E and displayed on the computer monitor.

  In the present invention, it is necessary to measure the number of entanglements of the total length of the yarn in one yarn package. The measurement was repeated every 100 m from the cheese surface layer until the raw yarn disappeared. That is, when the yarn length is xm (x ≧ 100), the measurement in units of 100 m was performed x / 100 times (rounded up after the decimal point). For the remaining yarn that is less than 100 m in the innermost layer, if the remaining yarn is 10 m or more, the average value is the number of entanglements and the standard deviation (σ) is the average value from the measurement results for each entanglement number for each meter. The value obtained by dividing was regarded as the variation in the number of confounding (CV value), and when it was less than 10 m, it was excluded from the measurement results.

  The relationship between the number of entanglements and the variation in the number of entanglements (CV value) in claims 1 to 3 is as follows.

  Claim 1: From x / 100 (rounded up after the decimal point) data obtained from x / 100 (rounded up after the decimal point) measurement results, all the numbers of confounding and the variation CV value of the number of confounded numbers are described in claim 1. We investigated whether it was in range.

  Claim 2: From x / 100 (rounded up to the decimal point) pieces of data, it was investigated whether or not any continuous 50 times was within the range of Claim 2.

  Claim 3: From the measurement results of x / 100 times (rounded up after the decimal point), it was investigated whether the data for 30 times from the beginning of the winding were within the range of Claim 3.

  (7) Weavability: A loom operating rate of 95% or more was evaluated as ◎, 90 to 94% as ○, 80 to 89% as Δ, and 79% or less as ×.

  (8) Coat resin adhesion spots due to weaving spots: After applying elastomer resin to the airbag fabric, it is judged visually whether or not resin adhesion spots have occurred due to weaving the weft yarns more than double. did. After weaving and coating of 2 rolls, the defect rate of the product is 0 to 0.5% ◎, 0.6 to 1.0 ○, 1.1 to 1.5% △, 1.6% or more × It was evaluated.

[Example 1]
Nylon 66 pellets having a 98% sulfuric acid relative viscosity of 3.7 measured at 25 ° C. and containing 68 ppm of copper acetate as copper were fed to an extruder, placed in a spinneret with a metering pump, and melt-spun at 295 ° C. The discharge amount and the spinneret were set and used so as to obtain a yarn having a total fineness of 350 dtex and a single yarn number of 72. A 200 mm heating cylinder heated to 300 ° C. is provided immediately below the base, and after slowly cooling the yarn, it is cooled and solidified with cold air at 20 ° C., and then an aqueous emulsion is applied, wound on a spinning take-up roller, and spun. I took the yarn. Subsequently, the yarn was continuously supplied to the drawing / heat treatment zone, and nylon 66 fibers were produced by a direct spinning drawing method.

  First, a stretch of 3% is applied between the take-up roller and the yarn feeding roller, then the first drawing is performed between the yarn feeding roller and the first drawing roller, and the second drawing is performed between the first drawing roller and the second drawing roller. The eye was stretched. Subsequently, 5% relaxation heat treatment was performed between the second stretching roller and the relaxation roller, the yarn was entangled with an entanglement imparting device, and then wound with a winder. The surface temperature of each roller was set so that the take-up roller was normal temperature, the yarn feeding roller was 40 ° C., the first stretching roller was 140 ° C., the second stretching roller was 210 ° C., and the relaxation roller was 150 ° C. The peripheral speed of each roller is constant at 3200 m / min for the first drawing roller and 4000 m / min for the second drawing roller, and the strength of the raw yarn is about 8.5 cN / dtex for the take-up roller and the yarn feeding roller. As shown in FIG. Moreover, the application amount of the water-based emulsion was adjusted so that the amount of oil adhering to the yarn was about 0.9% by weight. The entanglement process was performed by injecting high-pressure air from the direction perpendicular to the running yarn in the entanglement imparting device. A guide for regulating the running yarn was provided before and after the entanglement imparting device, and the pressure of the air to be injected was constant at 0.4 MPa. The winding of the yarn is performed at a constant tension of about 0.17 ± 0.02 cN / dtex, and the measured value of the winding speed at the time of winding is used as the spindle speed immediately after the full pipe is switched. Set. By using the above method, about 180,000 m of both warp yarn and weft yarn was wound up per cheese to obtain an air bag yarn package.

  Next, the nylon 66 fibers unraveled from the raw yarn package obtained above are warped at a speed of 400 m / min, and then air-jet loom (JAT610 type) manufactured by Toyota Industries Corporation. The weave density of the warp and weft was 67, 60 pieces / 2.54 cm, respectively, so that the cover factor was 2254, and weaved at a weaving width of 3.36 m and a release speed of 543 m / min × 3 picks to obtain a woven fabric base fabric. . Subsequently, the raw machine was refined at 40 ° C., subjected to boiling water treatment at 96 ° C., dried at 130 ° C. for 3 minutes, and subjected to heat treatment at 180 ° C. for 1 minute. Next, the base fabric was coated with a silicone resin to obtain an airbag base fabric.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 2]
The initial tension at full pipe switching is 0.26 ± 0.02 cN / dtex, and the winding tension is gradually reduced so that the tension at the end of winding is 0.16 ± 0.02 cN / dtex. Except that, an air bag yarn package and an air bag base fabric were obtained in the same manner as in Example 1.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 3]
Up to 80,000 m from the beginning of winding is wound at a constant 0.17 ± 0.02 cN / dtex, and from 80,000 to 100,000 m, the tension is 0.10 ± 0.02 cN / dtex per 5000 m. The increase and decrease of 4 times was repeated, and up to 100-180,000 m was wound in a constant manner of 0.17 ± 0.02 cN / dtex, in the same manner as in Example 1, and the airbag yarn package and the air bag A base fabric for a bag was obtained.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 4]
Implemented except that the steady winding tension was constant at 0.17 ± 0.02 cN / dtex and the spindle rotation speed was set so that the initial tension after full pipe switching was 0.23 cN / dtex. In the same manner as in Example 1, an air bag yarn package and an air bag base fabric were obtained.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 5]
In the same manner as in Example 1 except that the pressure of the air injected from the direction perpendicular to the running yarn in the entanglement imparting device is constant at 0.2 MPa, the airbag yarn package and the airbag base fabric are Obtained.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 6]
The air bag yarn package and the air bag base are the same as in Example 1 except that the air pressure injected from the direction perpendicular to the traveling yarn in the confounding device is wound at a constant 0.7 MPa. I got a cloth.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 7]
Original yarn package for airbag and airbag as in Example 1 except that 4% relaxation heat treatment was performed between the second stretching roller and the relaxation roller, and the temperature of the second stretching roller was 200 ° C. A base fabric was obtained.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 8]
An air bag yarn package and an air bag base fabric were obtained in the same manner as in Example 1 except that the water-based emulsion was applied so that the amount of oil adhering to the yarn became 0.4% by weight.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 9]
An air bag yarn package and an air bag base fabric were obtained in the same manner as in Example 1 except that the water-based emulsion was applied so that the amount of oil adhering to the yarn became 1.6% by weight.

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Example 10]
Nylon 66 fiber unwound from the raw yarn package obtained in the same manner as in Example 4 was warped at a speed of 400 m / min, and then a cover factor was used using a water jet loom (ZW303) manufactured by Tsudakoma. Was woven at a weaving width of 1.5 m and a releasing speed of 800 rpm to obtain a plain woven fabric. Subsequently, the raw machine was refined at 40 ° C., subjected to boiling water treatment at 96 ° C., dried at 130 ° C. for 3 minutes, subjected to heat treatment at 180 ° C. for 1 minute, and coated to obtain an airbag base fabric. .

  Table 1 shows the results of measurement and evaluation of the entanglement characteristic value of the air bag yarn package obtained as described above and the effect when the airbag fabric was manufactured using the yarn package.

  By using the air bag yarn package of the present invention, it was possible to obtain an air bag base fabric having excellent weaving properties and less coating resin adhesion unevenness due to weaving spots.

[Comparative Example 1]
The pressure of the air injected from the direction perpendicular to the traveling yarn in the confounding imparting device was constant at 0.17 MPa. In addition, the constant winding tension is constant at 0.17 ± 0.02 cN / dtex, and the spindle rotation speed is set so that the initial tension after full pipe switching is 0.25 cN / dtex, and winding is performed. In the same manner as in Example 1, an air bag yarn package and an air bag base fabric were obtained.

  Table 2 shows the results of measurement and evaluation of the entanglement characteristic values of the air bag yarn package obtained as described above and the effects when the airbag fabric was manufactured using the yarn package.

  As a result, compared with the case where the airbag fabric was obtained using the airbag yarn package of the present invention, the weaving property was inferior and the coating resin adhesion spots due to the weaving spots were many.

[Comparative Example 2]
In the same manner as in Example 1, except that the air pressure injected from the direction perpendicular to the traveling yarn in the entanglement imparting device is wound at a constant value of 0.17 MPa, the air bag yarn package and the air bag base are wound. I got a cloth.

  Table 2 shows the results of measurement and evaluation of the entanglement characteristic values of the air bag yarn package obtained as described above and the effects when the airbag fabric was manufactured using the yarn package.

  As a result, compared with the case where the airbag fabric was obtained using the airbag yarn package of the present invention, the weaving property was inferior and the coating resin adhesion spots due to the weaving spots were many.

[Comparative Example 3]
The airbag is the same as in Example 1, except that the steady winding tension is 0.17 ± 0.04 cN / dtex and the tension fluctuation range is increased, and the running yarn regulating guides before and after the confounding device are removed. A raw yarn package and an airbag base fabric were obtained.

  Table 2 shows the results of measurement and evaluation of the entanglement characteristic values of the air bag yarn package obtained as described above and the effects when the airbag fabric was manufactured using the yarn package.

  As a result, compared with the case where the airbag fabric was obtained using the airbag yarn package of the present invention, the weaving property was inferior and the coating resin adhesion spots due to the weaving spots were many.

[Comparative Example 4]
The initial tension at full pipe switching is 0.28 ± 0.02 cN / dtex, and the winding tension is gradually reduced so that the tension at the end of winding is 0.16 ± 0.02 cN / dtex. Except that, an air bag yarn package and an air bag base fabric were obtained in the same manner as in Example 1.

  Table 2 shows the results of measurement and evaluation of the entanglement characteristic values of the air bag yarn package obtained as described above and the effects when the airbag fabric was manufactured using the yarn package.

  As a result, as in the case of obtaining the airbag fabric using the airbag yarn package of the present invention, although the woven property is excellent, the occurrence frequency of coating resin adhesion spots due to the weaving spots increases. It was inferior in respect.

[Comparative Example 5]
The pressure of air injected from the direction perpendicular to the running yarn in the confounding device is constant at 0.35 MPa, the initial tension at full pipe switching is 0.26 ± 0.02 cN / dtex, and the tension at the end of winding In the same manner as in Example 1, except that the winding tension was gradually decreased so that the winding tension was 0.16 ± 0.02 cN / dtex, the airbag yarn base package and the airbag base I got a cloth.

  Table 2 shows the results of measurement and evaluation of the entanglement characteristic values of the air bag yarn package obtained as described above and the effects when the airbag fabric was manufactured using the yarn package.

  As a result, compared with the case where the airbag fabric was obtained using the airbag yarn package of the present invention, the weaving property was inferior and the coating resin adhesion spots due to the weaving spots were many.

[Comparative Example 6]
The pressure of the air sprayed from the direction perpendicular to the running yarn in the confounding device is constant at 0.7 MPa, the initial tension at full pipe switching is 0.30 ± 0.02 cN / dtex, and the tension at the end of winding Air bag yarn and air bag base fabric in the same manner as in Example 1 except that the winding tension was gradually reduced so that the tension was 0.14 ± 0.02 cN / dtex. Got.

  Table 2 shows the results of measurement and evaluation of the entanglement characteristic values of the air bag yarn package obtained as described above and the effects when the airbag fabric was manufactured using the yarn package.

  As a result, as in the case of obtaining the airbag fabric using the airbag yarn package of the present invention, the coating resin adhesion spots due to the weaving spots were small, but the weaving property was slightly inferior.

    According to the present invention, it is possible to provide a high-quality airbag base fabric having excellent weaving properties and less base fabric defects such as weaving spots, and an airbag yarn package particularly suitable for air jet loom weaving is obtained. It is done.

  Further, according to the present invention, it has excellent quality as a base fabric for airbags, particularly an inflatable curtain base fabric that could not be achieved by the prior art, and is woven by an air jet room. A wide airbag fabric capable of efficient cutting can be obtained.

  Therefore, the technique of the present invention greatly contributes to the improvement of safety awareness in the vehicle field, particularly in that field.

Claims (8)

This is a package in which raw yarns having a confounding number (I) of 12 to 30 / m and a variation (CV value) of confounding number of 3 to 15% are wound, and the number of confounding numbers (I) in this package is A raw yarn package for an airbag, wherein the maximum value (I _MAX ) and the minimum value (I _MIN ) satisfy the relationship of the following formulas (A) and (B) at the same time.
I _MAX −I _MIN ≦ 3 (pieces / m) (A)
(I _MAX -I _MIN ) / ((I _MAX + I _MIN ) / 2) ≦ 0.16 (B) 2. The air bag yarn package according to claim 1, wherein the difference between the maximum value and the minimum value of the number of entanglements in a continuous arbitrary 5000 m of the wound yarn is 2.5 pieces / m or less. . 3. The airbag yarn package according to claim 1, wherein a difference between the maximum value and the minimum value of the number of entanglements within 3000 m from the start of winding of the wound yarn is 2 pieces / m or less. The total fineness of the raw yarn is 200 to 700 dtex, the number of single yarns is 30 to 250, the boiling water shrinkage is 5 to 10%, and the amount of attached oil is 0.5 to 1.5% by weight. Item 4. The yarn package for an airbag according to any one of Items 1 to 3. The yarn obtained by unwinding from the airbag yarn package according to any one of claims 1 to 4 is used as a warp yarn and a weft yarn or a weft yarn, and is represented by the following formula (C): A base fabric for an air bag, wherein the cover factor (K) is woven in a range of 1800 to 2700.
K = Nw × (0.9Dw) ^1/2 + Nf × (0.9Df) ^1/2 (C)
Nw: Warp yarn density (lines / inch)
Dw: Warp yarn fineness (dtex)
Nf: Thread density (lines / inch)
Df: Weft yarn fineness (dtex) 6. The airbag fabric according to claim 5, wherein the airbag fabric is woven by an air jet loom. 7. The airbag fabric according to claim 5, wherein the airbag fabric is a coating fabric coated with an elastomer resin selected from silicone resin, polyurethane resin and polychloroprene rubber. The airbag fabric according to any one of claims 5 to 7, wherein the airbag fabric is for an inflation-flatable airbag.