JP5974112B2 - Airbag fabric - Google Patents

Description

  The present invention relates to an airbag fabric used as a bag body of an airbag device that is an occupant protection device when a vehicle collides.

  In order to reduce the impact on the human body in the case of a vehicle collision accident such as an automobile, the installation of airbags on vehicles has been progressing. In addition to driver and passenger airbags, curtain airbags, side airbags, knee airbags, rear airbags, etc., as airbags that inflate with gas and absorb and mitigate impact on the human body in the event of a collision Is being put into practical use for occupant protection. Furthermore, in order to protect pedestrians, airbags that are installed so as to be inflated outside the passenger compartment of a vehicle have been proposed, and the installation has been expanded.

  Regarding the frontal collision safety airbag, it is also the position of an auxiliary restraint device added to the seat belt, which is the main safety device, and the airbag is individually identified and managed as an important part. Further, among airbag devices, an individual identification number (product number, production lot number, etc.) for production is also given to the airbag bag body.

  As described in Patent Document 1 below, conventionally, an airbag bag body has been stamped or a label seal has been attached. These are identifications of the airbag bag body, and the individual identification information regarding the airbag fabric is not attached to the airbag fabric, and is not attached to the airbag bag body. Patent Document 1 below discloses a method for identifying an airbag bag body with a sewing thread. Further, Patent Document 2 below discloses a method of identifying a part with a cut shape in a portion distribution for airbag sewing. However, until now, individual identification information has not been expressed on the airbag fabric itself.

Until now, the fabric for airbags was identified only by labeling or printing on the fabric roll as individual identification, and there was no individual identification display on the fabric itself. In the case of a coated base fabric, there are cases where the front and back sides are discriminated and the standard identification of the fabric for the airbag is performed depending on the hue of the coating resin, but the individual identification information is shown in the distribution after cutting for airbag sewing It never happened. In the case of a non-coated base fabric, after cutting into a part distribution for an airbag, not only the individual identification information could not be obtained from the cut fabric piece itself, but also the front and back sides could not be distinguished, and further, the fabric such as the weave density Standards could not be identified without time and effort such as analyzing characteristics. It is not allowed for quality assurance to mistakenly introduce airbag fabrics with different weaving density standards into the production process, and it is important for production management to be able to identify without error. It is also important for production management to confirm and record the individual identification information of parts and to assemble and produce them. However, until now, the identification information of the fabric roll has only been associated with the airbag bag body by the production ledger, and there has been no indication in the cut portion distribution itself for sewing the airbag. Therefore, there is a possibility of misuse at the time of assembly, and there is also a problem that it is troublesome to track the production history from the fabric of the airbag bag body after sewing, and at the same time, the history cannot be determined accurately. .
Therefore, it has been desired to display individual identification information for production management and material display for collection on the airbag fabric itself.

JP 2003-276547 A Japanese Laid-Open Patent Publication No. 1-172046

  An object of the present invention is to provide a fabric for manufacturing an airbag displaying material information, standard identification, individual identification information, and the like. That is, by displaying information on the airbag fabric itself, it is possible to provide a fabric for manufacturing an airbag in which production management can be easily tightened and production history can be easily tracked.

As a result of studying a method for showing production information on a fabric for an air bag, the present inventor has found that the distinguishability is greatly improved by printing directly on the fabric and has made the present invention.
That is, the present invention relates to the following fabric for airbags.

(1) Production information including a barcode or two-dimensional code for inkjet printing is regularly and repeatedly present directly on the fabric of the airbag bag body , the repetition interval being 50 to 2 cm, and the barcode printing Is at least on one side and the following formula (1):
Bleeding index N = | B−A | / A (1)
{In the formula, A and B are the minimum line width (mm) and the maximum line width (mm) of the barcode line on the cloth, respectively. } The woven fabric fabric for an air bag characterized by the bleeding index N defined by
(2) The airbag fabric according to (1) , wherein the repetition is a plurality of parallel arrangements.
(3) The fabric for airbag according to (1) , wherein the repetition is a staggered arrangement.
(4) the user can confirm the printing from the rear surface of the ink-jet printed surface, (1) to (3) woven fabrics for an airbag according to any one of.
(5) The airbag fabric according to (4) , wherein at least a part of the production information is reversely printed.
(6) The textile fabric for airbags according to (1) to (5) , which does not have a resin coating.
(7) The textile fabric for an airbag according to any one of (1) to (6) , wherein at least one surface of the fabric has a resin coating, and the inkjet printing is present in a portion without the resin coating.
(8) The textile fabric for an airbag according to (7) , wherein the resin coating is light transmissive.
(9) Tmax obtained from dynamic viscoelasticity measurement is 110 to 150 ° C., and the ratio S [1 / ° C.] (tan δ (max) / Tmax) of tan δ (max) to Tmax at Tmax is 0.0001 to 0 The manufacturing method of the textile fabric for airbags in any one of (1)-(8) including the process of weaving using the warp and weft which are 0.001.
(10) The method according to (9) , wherein the warp and weft are at least one fiber selected from polyamide fibers and polyester fibers.
(11) An airbag bag body comprising the airbag fabric according to any one of (1) to (8) .
(12) An airbag device comprising the airbag bag body according to (11) .

  With the fabric of the present invention, production information is directly printed on the fabric, so that individual identification information such as production lot and product number can be obtained directly from the fabric, as well as easy identification of the product number and the front and back of the fabric. So that production management can be easily tightened. In addition, since the production information is written on the fabric of the airbag bag body even after being incorporated in the vehicle as an airbag device, the production history can be easily traced. Furthermore, the material for the airbag can be provided because the material is directly marked on the fabric and the resources can be easily recovered.

An example (parallel) of the printing state of the fabric of this invention is shown. Another example (staggered) of the printing state of the fabric of this invention is shown. It is a figure explaining the measuring method of the minimum line width A and the maximum line width B for a blurring index calculation.

Hereinafter, the present invention will be specifically described.
The airbag fabric of the present invention has production information printed directly on the fabric by ink jetting.
The airbag fabric used in the present invention may be any fabric. For example, the fibers constituting the fabric are synthetic long fibers made of a thermoplastic resin, and can be selected from polyamide fibers, polyester fibers, and the like.

  Polyamide fibers constituting the fabric include polyamide 6, polyamide 6 · 6, polyamide 11, polyamide 12, polyamide 6 · 10, polyamide 6 · 12, polyamide 4 · 6, copolymers thereof, and mixtures thereof. The fiber which consists of is mentioned. In particular, the polyamide 6/6 fibers are preferably fibers mainly composed of polyhexamethylene adipamide resin. The polyhexamethylene adipamide resin refers to a polyamide resin having a melting point of 250 ° C. or higher composed of 100% hexamethylenediamine and adipic acid. As long as the melting point of the resin does not become less than 250 ° C., it may be a fiber made of a resin obtained by copolymerizing or blending polyhexamethylene adipamide with polyamide 6, polyamide 6 · I, polyamide 6 · 10, polyamide 6 · T or the like. .

  Examples of the polyester fiber include a resin obtained by polycondensation of carboxylic acid and / or a derivative thereof and a diol by a known method, a resin made of hydroxycarboxylic acid, or a fiber made of a resin obtained by copolymerization or blending of these. Examples of the carboxylic acid component constituting the polyester fiber include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid, aliphatic dicarboxylic acids such as oxalic acid, succinic acid, maleic acid and fumaric acid, And cycloaliphatic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid. Examples of the diol include aliphatic diols such as ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, trimethylene glycol and diethylene glycol, and diphenols such as hydroquinone, resorcinol and bisphenol A. Kind. Examples of the hydroxycarboxylic acid include aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid. Specific examples of such polyester fibers include polyethylene terephthalate fiber, polybutylene terephthalate fiber, polytrimethylene terephthalate fiber, polycyclohexylene dimethylene terephthalate fiber, polyethylene naphthalate fiber, polybutylene naphthalate fiber, and polyethylene isophthalate-terephthalate. Examples thereof include polymer fibers, polybutylene isophthalate-terephthalate copolymer fibers, polycyclohexylenedimethylene isophthalate-terephthalate copolymer fibers, and the like. From the viewpoint of strength and heat resistance, polyethylene terephthalate fiber, polybutylene terephthalate fiber, polytrimethylene terephthalate fiber, polycyclohexylene dimethylene terephthalate fiber and polyethylene naphthalate fiber are preferable, and polyethylene terephthalate fiber, polybutylene terephthalate fiber, polytrimethylene More preferred are terephthalate fibers and polyethylene naphthalate fibers. Polyethylene terephthalate fiber is particularly preferred, and polyethylene terephthalate fiber containing 90 mol% or more, preferably 95 mol% or more of ethylene terephthalate repeating units in the molecular chain is preferred from the viewpoint of strength and heat resistance. Such polyethylene terephthalate fibers may contain other copolymer components in a proportion of less than 10 mol%, preferably less than 5 mol%. Examples of such copolymer components include isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, adipic acid, p-oxy Examples include benzoic acid, diethylene glycol, propylene glycol, 1,4-butylene glycol, trimellitic acid, pentaerythritol and the like.

The fineness of the fibers constituting the fabric is preferably 100 to 1000 dtex. More preferably, it is 200 to 800 dtex. The synthetic fiber constituting the fabric is a multifilament fiber composed of a large number of single yarns, and the fineness of the single yarn is preferably 0.5 to 8 dtex. The smaller the single yarn fineness is 8 dtex or less, the better the liquid retention of the ink jet and the less likely the blur occurs. The blur index N, which will be described later, becomes smaller, and the ink jet printing is clearer. The single yarn fineness is more preferably 4.5 dtex or less. If the single yarn fineness is 0.5 dtex or more, the filament is not damaged during the processing step, and the quality of the fabric is not impaired.
In order to obtain a fabric excellent in surface smoothness, the fibers constituting the fabric are preferably substantially untwisted. Substantially untwisted is a fiber in a state in which an intended twist is not put, and is a fiber in a twist state of 10 times / m or less that occurs with unraveling or the like.

  The fabric of the present invention is preferably printed with the surface of the fabric being smoothed. For this purpose, it is preferable to use warp and weft having specific characteristics. That is, the Tmax determined from the dynamic viscoelasticity measurement of warp and weft is preferably 100 to 150 ° C, more preferably 110 to 150 ° C, particularly preferably 110 to 145 ° C, and most preferably 110 to 130 ° C. Furthermore, the ratio S [1 / ° C.] (tan δ (max) / Tmax) of tan δ (max) and Tmax at the temperature Tmax is preferably 0.0001 to 0.0030, more preferably 0.0001 to 0.0010, and particularly preferably. Is 0.0001 to 0.0009, most preferably 0.0001 to 0.0008. Tmax by dynamic viscoelasticity measurement is a temperature at which the thermal motion of the molecular chain in the amorphous part becomes remarkable, and is considered to be a temperature at which the amorphous part undergoes a phase transition from the glass state to the rubber state. In the temperature history lower than Tmax, the dimensional stability such as the elastic modulus and the dry heat shrinkage rate is suppressed from being significantly reduced. On the other hand, when a temperature history higher than Tmax is received, the amorphous part is in a rubber state, so that it is greatly affected by the temperature. Therefore, Tmax is a guideline for determining the temperature in the processing of the woven fabric, and within the above range, the effect after processing can be maintained even after a long period of time, and it is effective without an extremely high temperature inferior in energy efficiency. Processing can be performed, which is preferable. Further, a rough indication of the processing effect can be estimated by the ratio S of tan δ (max) and Tmax, and if it is in the above range, a practical effect can be expressed and the effect can be maintained even after a long period of time, which is preferable. In order to set Tmax and the ratio S within the predetermined ranges, the warp and weft materials and production conditions may be set appropriately.

The fabric may be woven or knitted. For example, in the case of a woven fabric, the cover factor of the fabric is preferably 1900 to 2600. The cover factor CF is calculated by the following calculation.
CF = (√warp fineness (dtex)) × warp density (main / 2.54 cm) + (√weft fineness (dtex)) × weft density (main / 2.54 cm).
The cover factor is the degree of filling of the fiber in the plane, and if it is 1900 or more, the high density fabric can satisfy the mechanical characteristics such as the pressure resistance of the airbag. Further, the gap between the warp and the weft is filled, and the blurring propagation of the ink jet droplets traveling along the gap can be prevented. If the cover factor is 2600 or less, the fabric is lightweight and flexible as an airbag. More preferably, it is 2000-2500.

  The structure of the woven fabric is not particularly limited, and a known structure can be used. For example, a basic structure such as a plain woven fabric, an oblique woven fabric, a satin woven fabric, or a changed structure formed by changing or mixing the basic structure is exemplified. A plain woven fabric is a structure in which warps and wefts are alternately crossed one by one, and has no front and back, and has a high degree of equivalence in the warp and weft directions. Examples of the changed plain woven fabric include a woven fabric in which crossing points are added to the top and bottom or left and right of the crossing point of the flat woven fabric to show wrinkles on the surface, and an oblique fabric in which two or more wefts enter the same shed. . The oblique woven fabric is a structure having oblique lines in which the crossing points run obliquely. As the changed oblique woven fabric, the sharp oblique woven fabric having an oblique line of 45 ° or more, the mountain-shaped oblique woven fabric having a mountain shape, the constant Examples include a broken sloppy fabric in which a slash line appears in the opposite direction to the interval, and a curved slash fabric having a combination of obliques having different inclination angles. A satin fabric is a fabric in which a combination of warps and wefts is arranged at a constant interval, and a warp appears on the surface when many warps appear, and the opposite is a weft. Examples of the change satin fabric include irregular satin fabrics in which the intersection points are irregularly arranged. Of these, a plain woven fabric is preferable in terms of surface smoothness.

  The fabric used for the fabric of the present invention is woven using a known loom. For example, it can be obtained by using a weaving machine such as a shuttle loom, a rapier loom, an air jet loom, a water jet loom or the like and driving a weft into a warp in which synthetic fibers are arranged. In addition, it is preferable to weave the yarns at a high density with the number of warped yarns being 2 or less because the surface smoothness of the fabric is increased and the bleeding index N can be reduced by uniformly reducing the gap between the yarns. . More preferably, the number of warp yarns is 2 / feather.

  The woven weaving machine may be subjected to a scouring process to wash the raw thread oil as necessary. The processing temperature at that time is preferably in the range from 40 ° C. to the lower one of the warp and weft Tmax (Tmax (L)), more preferably in the range of 40 ° C. to (Tmax (L) −10 ° C.), particularly preferably. Is preferably as low as possible in the range of 40 ° C. to (Tmax (L) −30 ° C.), and it is avoided that the fibers constituting the fabric shrink and the surface unevenness increases. More preferably, the hot water treatment including scouring is not performed.

  Scouring reduces the oil content of the fabric. The oil content of the fabric is preferably 0.05 to 0.3% by weight. If the oil content is 0.3% by weight or less, it contributes to suppression of deterioration of bleeding over time of ink jet printing. If the oil content is 0.05% by weight or more, it contributes to suppression of bleeding by holding droplets during printing. The oil content can be appropriately controlled depending on the conditions of water jet weaving and scouring.

  Next, it is preferable to perform a drying step in the range of 50 ° C. to Tmax (L), preferably 60 ° C. to (Tmax (L) −10 ° C.), more preferably 60 ° C. to (Tmax (L) −20 ° C.). . If it is this temperature range, drying will be completed in practical processing time, the dispersion | variation in the yarn density by the heat shrink at the time of drying, etc. will be suppressed, and the deterioration of surface smoothness will also be suppressed.

  When heat setting is performed to stabilize the thermal dimension of the fabric, the heat setting temperature is preferably Tmax (L) or more and 200 ° C. or less, more preferably Tmax (L) or more and 180 ° C. or less, particularly preferably Tmax (L). It is 170 degrees C or less. In this case, tension heat processing is preferable. A processing method that can receive and control the thermal stress without depending on the thermal contraction of the fiber in both the direction of warp and the back is preferable. For example, a pin tenter can be used. The heat setting process can also be performed by using a tenter method in the crosslinking heat treatment process of the resin coating.

  In the heat setting step, it is also preferable to perform calendering as a step accompanied by an improvement in the surface smoothness of the fabric. If calendar processing is performed before bar code printing, surface smoothness is improved, so that clear printing with a small bleeding index N is possible. The calendar temperature is preferably Tmax (L) or more and 200 ° C. or less, more preferably Tmax (L) or more and 180 ° C. or less, and particularly preferably Tmax (L) or more and 170 ° C. or less. It is preferable to stabilize the shape of the fabric by calendering. When the calendar temperature is 200 ° C. or lower, mechanical properties such as tear strength are not impaired. When the calendar temperature is Tmax (L) or higher, a sufficient surface smoothness improving effect can be obtained. The calendar load is preferably 1 to 1000 kg / m from the viewpoint of obtaining a sufficient effect of improving the surface smoothness without impairing the mechanical properties of the fabric.

  Production information to be printed includes individual identification information and material information. First, the individual identification information includes a product number indicating a fabric standard and a manufacturing number indicating a production lot, a manufacturing date, and the like. The standard of the fabric includes representative characteristics such as the fineness and woven density of the constituent fibers. Further, the production information to be printed includes a symbol indicating the material as material information.

  There are two types of ink jet printing systems, continuous ink jet (CIJ) and drop on demand (DOD), which can be used in the present invention. In the CIJ system, ink is ejected in a continuous stream from at least one opening or nozzle under pressure. The stream is perturbed and decomposed at a certain distance from the opening to produce droplets. At the breakup point, the droplets are charged according to the digital data signal and pass through an electrostatic field that adjusts the trajectory of each droplet, and each droplet is oriented at a specific location on the recirculating gutter or recording medium. Is done. In the DOD method, droplets are ejected directly from an opening to a position on a recording medium according to a digital data signal. Droplets are not formed or ejected unless they are placed on the fabric to be printed.

  In the fabric of the present invention, production information is directly printed, and production information is not labeled. Therefore, it is possible to freely print and display on the fabric without being limited by the label size or the number of sheets. According to ink jet printing, printing can be performed directly on a fabric, but without contact, and there is no physical impact such as stamping, and deformation or damage does not occur on the surface of the fabric. In addition, since the amount of ink can be controlled more precisely, it is possible to obtain a print display in which blurring and spots are prevented while clear printing is achieved by ink penetration.

  Production information including a barcode or a two-dimensional code is preferably printed on the fabric of the present invention. Production management is facilitated by expressing production information in a barcode or a two-dimensional code. That is, by reading production information with a code reader, it is possible to automatically generate a warning for misuse in the next processing step. In addition, it is easy to go back to the production history and analyze the process after inconvenience because detailed information can be read mechanically from the production information data server based on the printed production information.

  There are various symbol systems for bar codes or two-dimensional codes, and any symbol system may be used. For example, as the barcode symbol system, JAN, EAN, UPC, CODE-39 (JISX0503), NW-7, ITF, Standard 2 of 5, CODE-128, CODE-93, CODE-11, MSI, or the like can be used. As the two-dimensional code symbol system, QR Code, Data Matrix, PDF417, Maxi Code, Veri Code, and the like can be used. In particular, CODE-39 (JISX0503) and ITF are preferable because the amount of information is moderate and simple code expression. The barcode or two-dimensional code is composed of a combination of barcode lines having different line widths.

The fabric of the present invention preferably has a bleeding index N defined by the following formula (1) of 0 to 1.0 and a barcode is printed on at least one side. More preferably, the bleeding index N is 0 to 0.8, and more preferably 0 to 0.5.
Bleeding index N = | B−A | / A (1)
In the above formula (1), A and B are the minimum line width (mm) and the maximum line width (mm), respectively, when the length of 1 cm of the bar code line segment on the fabric is measured. When the line length of the barcode line is less than 1 cm, the measurement corresponding to the line length of 1 cm may be performed using a plurality of barcode lines. In the case where a plurality of barcode lines are used and the line widths of the barcode lines are different, the bleeding index is obtained by weighting and averaging the bleeding index measured for each barcode line.

  When the bleeding index N is in the above range, the barcode printing is clear, and the printing contents can be read accurately and easily by a barcode reader or a reading means such as visual observation, and the information on the fabric is accurately transmitted. Furthermore, it is preferable that the barcode printing quality is determined to be a comprehensive grade of C-2.0 or higher and a maximum of A-4.0 with a barcode verifier conforming to JISX0520: 2001. Especially preferably, it is B-2.5 or more.

  It is preferable that the fabric of this invention can confirm printing from the back surface of a printing surface. If the presence of printing can be determined from the back side, the front and back sides can be distinguished. By making it possible to discriminate between the front and back by visual inspection, or by using a bar code or a two-dimensional code, setting errors on the front and back can be easily prevented in the next process. In particular, it is easy to confirm printing from the back side of the printing surface by performing ink jet printing. Furthermore, if reverse printing can be read from the back side of the printing surface (that is, the non-printing surface), it is not only easy and reliable to distinguish between the front and the back, but production information can be obtained from the non-printing surface, so process control is possible. It becomes easy.

  Furthermore, it is preferable that the fabric of the present invention is a fabric on which at least a part is reversely printed, and the printing can be read from the back surface of the printing surface. With reverse printing, it is easy to read the code reader from the back side, and it is easy to visually check the front and back. Conventionally, identification and determination information cannot be obtained from the back side of the display surface by ink stamping or labeling.

  One embodiment of the fabric of the present invention is a fabric without a resin coating. Fabrics that do not have a resin coating are used as lightweight airbag fabrics, but basically they cannot be distinguished from each other. The front and back sides can be easily distinguished by the printed surface and the non-printed surface. In particular, if the printing can be confirmed from the non-printing surface, the front / back discrimination determination can be performed more reliably than the determination that there is no printing.

Another embodiment of the fabric of the present invention is a fabric having a resin coating on at least one surface and information printing on a portion without the resin coating. The resin coating is intended to make the fabric essentially completely airless. Various resins can be used as this resin, and in particular, silicone having flexibility under a wide range of temperature conditions is preferable. The printing surface is preferably printed on a portion without resin coating. By printing directly on the surface of the fabric, the sharpness when reading the print from the back surface of the print surface due to the infiltration of the ink is improved as compared with printing on the resin-coated surface. Conventionally, when the amount of resin is 50 g / m ² or more in an airbag fabric having a resin coating, it is difficult to read even if printing is performed from the back side. Further, when the amount of the coating resin is 50 g / m ² to 5 g / m ² , the color of the pigment on the resin surface is faint and the front / back identification may be mistaken. In the present invention, by performing inkjet printing on an uncovered portion with an airbag fabric having a resin coating, the resin-coated surface and the surface having a resin-uncoated portion can be distinguished from both sides.

  Furthermore, it is preferable that the resin coating has a light-transmitting property and is printed on a surface without the resin coating, and at least a part of the fabric is reverse printed. Even in the case of a fabric having a resin coating, it is possible to confirm printing from the non-printing surface by having light transmittance. Therefore, it is easy to distinguish the front and back. Further, if at least a part is reversely printed, it is easy to read production information from the non-printing surface with a code reader, and thus production management is facilitated. In addition to the transparency of the resin itself, the light transmittance of the resin depends on the type and content of the pigment added, but it is substantially transparent, including the thickness of the resin film, when it is coated on the fabric. If you have. In diffuse reflection measurement including specular reflection of 650 nm wavelength light with a spectrophotometer, the reflectance value on the surface with resin coating is preferably 80% or more with respect to the reflectance value on the surface without resin coating. The resin coating becomes substantially permeable. More preferably, it is 90% or more. Further, as a resin, it is preferable that the light transmittance of a film formed and cured with a thickness of 2 mm is 400 nm light and the transmittance is 80% or more. More preferably, it is 90% or more. Further, the resin coating thickness in the fabric is preferably 50 μm or less on average, and more preferably 25 μm or less on average.

It is preferable that the fabric of the present invention is printed regularly and repeatedly as a print group that represents information. By regularly and repeatedly printing on the fabric, it is possible to obtain a state in which production information is printed everywhere. When an airbag is formed by sewing, it is cut into various distributions. At this time, production information is always printed on the cut cloth.
The repeated print group can be arranged in a plurality of parallel arrangements as shown in FIG.
Further, the repeated print group can be a staggered arrangement as shown in FIG.
Furthermore, it is preferable that printing is repeated at intervals of 50 to 2 cm between print groups. When it is cut into a part distribution for an airbag, for example, for a driver's seat, it is formed from a part distribution within 70 cm square. At that time, production control is facilitated by printing production information at a plurality of locations in each part distribution.

In addition, the airbag bag body sewn with the fabric of the present invention has production information printed somewhere in the distribution of parts, and the production history can be easily traced. Furthermore, since production information can be read from both the front and back sides, production history can be easily traced.
The sewing airbag bag body made of the fabric of the present invention can be incorporated and used as an airbag module and an airbag device.

EXAMPLES Next, although an Example demonstrates this invention in detail, this invention is not limited only to these Examples. First, the barcode printing method and the bleeding index N measurement method used in the examples will be described.
(1) Smudge index N
A straight line with a length of 1 cm and a line width of 3 mm was printed in the fabric width direction at a position 5 cm from the center and ear edge of the fabric fabric using ethanol black ink with a 60 μm nozzle inkjet printer. 10 prints are repeatedly printed at 30 cm intervals in the long direction. At that time, the fabric moves the inkjet printer head at 20 m / min. The printed straight line is magnified 20 times, taken into image analysis software, and then binarized, and the width of the straight line is measured over 1 cm in length, and the minimum line width A and maximum line width B of each straight line are measured. Measure. From the value obtained by arithmetically averaging the minimum line width A and the maximum line width B of a total of 20 points at the center of the fabric, 10 positions 5 cm from the edge, and 20 points in total, the bleeding index N Ask for. FIG. 3 shows a part of an image obtained by binarizing a 20-fold enlarged image of a printed straight line. In this figure, 3 is part of the binarized image 20 times enlarged image of the line is printed, 4 is a minimum line width A, 5 is a maximum line width B.

Next, other physical property measuring methods used in the examples will be described below.
(2) Tmax, tan δ (max)
Using an EXSTAR DMS7100 manufactured by Seiko Instruments Inc., at a driving frequency of 110 Hz, a fiber bundle having a length of 20 mm and a cross-sectional area of about 3 × 10 −4 cm 2, room temperature at a heating rate of 5 ° C./min while passing dry nitrogen gas through the sample chamber To the temperature at which the main peak of tan δ can be observed. The main peak value of tan δ was tan δ (max), and the temperature at that time was Tmax (° C.).

(3) Oil content (wt%)
The fabric was Soxhlet extracted with cyclohexane solvent (10 times 3 hours at 60 ° C.). After the volatile matter was distilled off from the obtained extract, the extract was weighed, and the ratio to the absolute dry weight of the base fabric before extraction was defined as the oil content (% by weight).

[Example 1]
As the woven yarn, polyhexamethylene adipamide fiber having a fineness of 470 dtex and 136 single yarns was used. The tan δ (max) of this fiber was 0.075, Tmax was 122 ° C., and the ratio S was 0.00061 [1 / ° C.]. The warp yarns were drawn with no twist and no glue to obtain a warp beam. For the weft, it was supplied as it was from the winding package with no twist and no glue. A plain weave was woven using a water jet loom. The warp hook is 2 / feather. The obtained woven fabric was dried at 60 ° C. without scouring to make the moisture content of the woven fabric 3%. Next, the heat setting process was finished with a heating temperature of 200 ° C. for 1 minute and using a pin tenter, with an overfeed of 0% and a width of 2%. The weaving density of the finished fabric was 53.0 pieces / 2.54 cm. The oil content was 0.15% by weight.

  This fabric uses ethanol-based black ink with a 60-micron nozzle ink jet printer, and 10-mm wide CODE-39 barcode printing is performed in series at 15 cm intervals at a fabric feed rate of 20 m / min (ie, the interval l in FIG. 15 cm) and parallel with 15 cm intervals (that is, the distance d in FIG. 1 is 15 cm). When the printed surface was observed with a 35-fold magnifier, the bleeding index N was 0.6 in a state where the bar boundary was clear and there was no bleeding. This barcode printing could be read by the code reader even from the non-printing surface. The print quality evaluation of the printed surface by a bar code verifier (opening diameter 10 / wavelength 660) based on JIS X0520: 2001 was good at grade B-3.3. The reading and printing quality of the non-printing surface was good at grade B-2.7.

[Example 2]
In Example 1, heat calendering was performed instead of heat setting with a pin tenter. Thermal calendering was performed at a feed rate of 18 m / min, a metal roll temperature of 200 ° C., and a pressure of 600 N / cm. The upper and lower calendar rolls sandwiching the woven fabric have a 12 cm diameter upper metal roll for heating, a lower roll is a 24 cm diameter roll having a paper surface, and the surface speed is the same as the upper and lower speeds. The paper roll surface has a Shore D hardness of 65. The weaving density of the finished fabric was 53.0 pieces / 2.54 cm. The oil content was 0.15% by weight.
In the same manner as in Example 1, a barcode was printed on the surface smoothed by the heating calendar roll process. The bleeding index N was 0.1, which was good. The print quality evaluation of the printed surface by the bar code verifier (opening diameter 10 / wavelength 660) was good at grade A-3.6. The reading and printing quality of the non-printing surface was good at grade B-2.7.

[Example 3]
In Example 1, after weaving and drying, 20 g / m ² of a two-component curable type silicone having no color pigment added thereto was applied and finished by vulcanization by heating at 180 ° C. for 2 minutes. The weaving density was adjusted on the loom, and the weaving density of the finished fabric was 49.0 / 2.54 cm. The oil content was 0.15% by weight.
A bar code was printed on the non-coated surface by inkjet in the same manner as in Example 1. The blur index N was 0.8. The print quality evaluation of the printed surface by the bar code verifier (opening diameter 10 / wavelength 660) was good at grade B-2.8. The reading and printing quality of the non-printing surface was good at Grade B-2.5.

[Example 4]
In Example 1, thermal calendering was performed instead of heat setting. Thermal calendering was performed at a feed rate of 18 m / min, a metal roll temperature of 200 ° C., and a pressure of 600 N / cm. The upper and lower calendar rolls sandwiching the woven fabric have a 12 cm diameter upper metal roll for heating, a lower roll is a 24 cm diameter roll having a paper surface, and the surface speed is the same as the upper and lower speeds. The paper roll surface has a Shore D hardness of 65. The weaving density of the finished fabric was 49.0 / 2.54 cm. Further, 20 g / m ^{2 of} a two-component curable type silicone not added with a colored pigment was applied to the surface of the non-heated calender roll side and finished by vulcanization by heating at 180 ° C. for 2 minutes. The oil content was 0.15% by weight.
Inkjet printing was performed in the same manner as in Example 1 on the surface smoothed by the heating calendar roll process. The bleeding index N was as good as 0.1. This barcode printing could be read from a non-printing surface which is a coating surface with a code reader (opening diameter 10 / wavelength 660). The print quality of the printed surface by the bar code verifier was good at Grade A-3.6. The reading print quality evaluation on the non-printing surface was good at grade B-2.8.

[Example 5]
A plain weave was woven using the woven yarn of Example 1 in the same manner as in Example 1, and after weaving, it was retained in a 60 ° C. warm water bath for 1 minute and dried at 60 ° C. Furthermore, thermal calendar processing was performed. Thermal calendering was performed at a feed rate of 18 m / min, a metal roll temperature of 200 ° C., and a pressure of 600 N / cm. The upper and lower calendar rolls sandwiching the woven fabric have a 12 cm diameter upper metal roll for heating, a lower roll is a 24 cm diameter roll having a paper surface, and the surface speed is the same as the upper and lower speeds. The paper roll surface has a Shore D hardness of 65. The weaving density of the finished fabric was 49.0 / 2.54 cm. Next, 20 g / m ^{2 of} a two-component curable type silicone to which no colored pigment was added was applied to the surface on the non-heated calendar roll side, and finished by vulcanization by heating at 180 ° C. for 2 minutes. The oil content was 0.08% by weight.
Ink-jet printing was performed in the same manner as in Example 1 on the surface that was smoothed by heating calender roll processing and was not coated with silicone. The blur index N was 0.5. The print quality evaluation of the printed surface by the bar code verifier (opening diameter 10 / wavelength 660) was good at grade B-3.2. The reading and printing quality of the non-printing surface was good at Grade B-2.5.

[Example 6]
A polyethylene terephthalate fiber having a fineness of 550 dtex and 144 single yarns was used as a woven yarn. The tan δ (max) of this fiber was 0.09, Tmax was 125 ° C., and the ratio S was 0.00072 [1 / ° C.].
Plain weaving with a water jet loom and drying at 60 ° C. without scouring to a moisture content of 0.8%. Next, thermal calendering was performed at a feed rate of 18 m / min, a metal roll temperature of 200 ° C., and a pressure of 600 N / cm, and the other side was processed and finished under the same conditions. The upper and lower calender rolls sandwiching the fabric are both 12 cm in diameter for the heating metal roll, and the surface speed is the same as the upper and lower speeds. The weaving density of the finished fabric was 53.0 / 2.54 cm. The oil content was 0.12% by weight.

  Similar to Example 1, ethanol-based black ink was used on this fabric with a 60-micron nozzle inkjet printer, barcode printing of CODE-39 having a width of 10 mm at a fabric feed rate of 20 m / min was performed in series at intervals of 15 cm, and , Performed in parallel at 15 cm intervals. When the printed surface was observed with a 35 times magnifier, the boundary between the bars was clear and there was no blur. The bleeding index N was as good as 0.2. This barcode printing could be read by the code reader even from the non-printing surface. The print quality of the printed surface by a bar code verifier (opening diameter 10 / wavelength 660) based on JISX0520: 2001 was good at grade A-3.6. The reading and printing quality of the non-printing surface was good at Grade B-3.2.

[ Reference Example 7]
A plain weave was woven in the same manner as in Example 1 using the woven yarn of Example 1, and after weaving, it was retained in a high-pressure hot water tank at 115 ° C. for 1 minute, dried at 120 ° C. and finished. The weave density of the finished fabric was warp 54.0 / 2.54 cm and weft 53.5 / 2.54 cm. The oil content was 0.02% by weight.
In the same manner as in Example 1, a barcode was printed by inkjet. When the printed surface was observed with a 35 times magnifier, the surface of the fabric had many irregularities and the boundary between the bars was unclear and blurred. The smudge index N was poor at 1.2. The print quality of the printed surface by the bar code verifier (opening diameter 10 / wavelength 660) was poor at grade C-2.0. The quality of reading and printing on the non-printing surface was poor at Grade C-1.8.

[ Reference Example 8]
In Example 4, the calendering temperature was changed to 120 ° C. The weaving density of the finished fabric is 49.0 / 2.54 cm. The oil content was 0.15% by weight.
In the same manner as in Example 1, a barcode was printed by inkjet. When the printed surface was observed with a 35 times magnifier, the surface of the fabric had many irregularities and the boundary between the bars was unclear and blurred. The smudge index N was poor at 1.1. The print quality of the printed surface by the bar code verifier (opening diameter 10 / wavelength 660) was poor at grade C-2.4. The reading and printing quality of the non-printing surface was poor at grade C-1.9.

[ Reference Example 9]
As the woven yarn, polyhexamethylene adipamide fiber having a fineness of 470 dtex and 136 single yarns was used. The tan δ (max) of this fiber was 0.12, Tmax was 108 ° C., and the ratio S was 0.00111 [1 / ° C.]. The warp yarns were drawn with no twist and no glue to obtain a warp beam. For the weft, it was supplied as it was from the winding package with no twist and no glue. A plain weave was woven using a water jet loom. The obtained woven fabric was dried at 60 ° C. without scouring to make the moisture content of the woven fabric 3%.
Subsequently, the same calender heat processing as Example 2 was performed and finished. The weaving density of the finished fabric was 53.0 pieces / 2.54 cm. The oil content was 0.15% by weight.
In the same manner as in Example 1, a barcode was printed on the surface smoothed by the heating calendar roll process. When the printing surface was observed with a 35 times magnifying glass, the surface of the fabric was non-uniform, unevenness was remarkable, the boundary of the bar was unclear, and there were many blurs. The smudge index N was as bad as 1.3. The print quality of the printed surface by the bar code verifier (opening diameter 10 / wavelength 660) was poor at grade C-1.6. The quality of reading and printing on the non-printing surface was poor at grade D-1.4.

  The fabric of the present invention is suitable as a fabric for an airbag for manufacturing an airbag bag body of a vehicle collision safety device, prevents erroneous assembly in an airbag assembly and sewing process, and is excellent in quality control in a production process. This is an airbag fabric that enables production information identification in the final product.

1 part of 20-fold image of the magnified image binarization fabric 2 straight lines printed group 3 Printing airbag 4 minimum line width A
5 The maximum line width B
d Parallel spacing between print groups l Serial spacing between print groups

Claims (12)

Production information, including barcodes or two-dimensional codes for inkjet printing , is regularly and repeatedly present on the fabric of the airbag bag body , the repetition interval is 50-2 cm, and the barcode printing is at least on one side In the following formula (1):
Bleeding index N = | B−A | / A (1)
{In the formula, A and B are the minimum line width (mm) and the maximum line width (mm) of the barcode line on the cloth, respectively. } The woven fabric fabric for an air bag characterized by the bleeding index N defined by The airbag fabric according to claim 1 , wherein the repetition is a plurality of parallel arrangements. The repetition is staggered, woven fabric for an air bag according to claim 1. Wherein it is possible to confirm the printing from the rear surface of the ink-jet printed surface, the textile fabric for an air bag according to any one of claims 1-3. At least part of which is inverted printing, textile fabrics for an airbag according to claim 4 of producing information. The textile fabric for airbags of any one of Claims 1-5 which does not have a resin coating. Has a resin coating on at least one surface of the fabric, the ink-jet printing on a portion having no said resin coating is present, the textile fabric for an air bag according to any one of claims 1-6. The textile fabric for airbags according to claim 7 , wherein the resin coating is light-transmitting. The Tmax determined from the dynamic viscoelasticity measurement is 110 to 150 ° C., and the ratio S [1 / ° C.] (tan δ (max) / Tmax) of tan δ (max) to Tmax at Tmax is 0.0001 to 0.001. The manufacturing method of the textile fabric for airbags of any one of Claims 1-8 including the process of weaving using a certain warp and weft . The method according to claim 9 , wherein the warp and weft are at least one fiber selected from polyamide fibers and polyester fibers. The airbag bag body which consists of the textile fabric for airbags of any one of Claims 1-8 . An airbag device comprising the airbag bag body according to claim 11 .

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