JPH10298841A - Sewing yarn - Google Patents

Sewing yarn

Info

Publication number
JPH10298841A
JPH10298841A JP11884797A JP11884797A JPH10298841A JP H10298841 A JPH10298841 A JP H10298841A JP 11884797 A JP11884797 A JP 11884797A JP 11884797 A JP11884797 A JP 11884797A JP H10298841 A JPH10298841 A JP H10298841A
Authority
JP
Japan
Prior art keywords
core
sheath
polymer
yarn
sewing thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11884797A
Other languages
Japanese (ja)
Inventor
Yoshimasa Aoki
義昌 青木
Katsuo Chikamura
勝雄 近村
Shoichiro Noguchi
章一郎 野口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KANEBO SENI KK
Kanebo Synthetic Fibers Ltd
Kanebo Ltd
Original Assignee
KANEBO SENI KK
Kanebo Synthetic Fibers Ltd
Kanebo Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KANEBO SENI KK, Kanebo Synthetic Fibers Ltd, Kanebo Ltd filed Critical KANEBO SENI KK
Priority to JP11884797A priority Critical patent/JPH10298841A/en
Publication of JPH10298841A publication Critical patent/JPH10298841A/en
Pending legal-status Critical Current

Links

Landscapes

  • Air Bags (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a sewing yarn used for sewing covers for covering the side air bag devices of automobiles and capable of forming seams easy in breakage on collision and always high in shape stability. SOLUTION: This sewing yarn is produced by forming synthetic multifilament yarns from sheath-core conjugate filaments each having a sheath portion 3 comprising a fiber-forming polymer and a core portion 2 comprising a polymer having a lower strength than the fiber-forming polymer, twisting the multifilaments in a prescribed direction, respectively, and subsequently folding the formed plural raw yarns in the reverse direction, or using a polymer larger in solubility or degradability than the sheath polymer as the core polymer, folding the plural raw yarns through the above-described processes, and subsequently dissolving or degrading at least a part of each core portion 2 to form a hollow portion.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、自動車等の衝突時
に二次衝突から乗員を保護するエアバッグ用カバー類の
縫製に使用する合成繊維製のフィラメントミシン糸及び
フィラメント手縫糸(以下これらを総称して縫糸と呼称
する)に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filament sewing machine thread and a filament hand sewing thread (hereinafter collectively referred to as synthetic thread) used for sewing airbag covers for protecting an occupant from a secondary collision at the time of collision of an automobile or the like. (Referred to as a sewing thread).

【0002】[0002]

【従来の技術】自動車等の車両において、これらの正面
からの衝突時、或は側面からの衝突時に直ちに展開して
乗員を保護するエアバッグは、特開平5−16751号
公報等に記載されているように、エアバッグ装置の一部
であるインフレータで発生した不活性ガスによって膨張
させられるもので、車体の所定の部位に配設したセンサ
ーが衝突を検知した際に出力する信号によってインフレ
ータ内のガス発生剤が点火され、瞬間的に発生する大量
のガスがエアバッグ内に急速に充満して膨張し、これが
ドライバとステアリングホイールとの間、又は助手席搭
乗者とダッシュボードとの間、或は各乗員とサイドドア
内面等の車室内側壁との間に夫々展開して、二次衝突か
ら乗員を保護するようになっている。
2. Description of the Related Art In a vehicle such as an automobile, an airbag which immediately deploys at the time of a collision from the front or from a side to protect an occupant is described in Japanese Patent Application Laid-Open No. Hei 5-16751. As described above, the inflator is inflated by an inert gas generated by an inflator that is a part of the airbag device, and a signal output when a sensor disposed at a predetermined portion of the vehicle body detects a collision detects a collision in the inflator. The gas generant is ignited and a large amount of instantaneously generated gas rapidly fills and expands the airbag, which can be between the driver and the steering wheel, or between the passenger and the dashboard, or Are deployed between each occupant and a side wall of the vehicle interior such as an inner surface of a side door to protect the occupant from a secondary collision.

【0003】各種のエアバッグの中で、車体側部に加わ
る衝撃荷重から乗員を保護する所謂サイドエアバッグ装
置の場合には、特開平2−249740号公報等に記載
の通り、エアバッグを乗員と車室内側壁との間の狹いス
ペースに素早く展開させる必要があり、又その際にエア
バッグを乗員の方向だけでなく上方にも展開させる必要
がある。
[0003] Among various airbags, a so-called side airbag device for protecting an occupant from an impact load applied to a side portion of a vehicle body is disclosed in Japanese Unexamined Patent Publication No. 2-249740. It is necessary to quickly deploy the airbag in a narrow space between the vehicle and the side wall of the passenger compartment, and in this case, it is necessary to deploy the airbag not only in the direction of the occupant but also upward.

【0004】このようなサイドエアバッグ装置の一例が
米国特許第4966388号明細書に記載されている。
この装置のエアバッグは、車輌側面のサイドドア等の内
側に折り畳まれた状態で収納されており、車輌側面の衝
突時にセンサがこの衝突を検知するとインフレータが着
火され、大量のガスが発生してエアバッグを瞬時に膨張
させ、乗員とサイドドアの内面との限られたスペース内
に展開して乗員を二次衝突から保護するようになってい
る。
One example of such a side airbag device is described in US Pat. No. 4,966,388.
The airbag of this device is housed in a folded state inside the side door etc. on the side of the vehicle, and when the sensor detects this collision at the time of collision on the side of the vehicle, the inflator is ignited and a large amount of gas is generated. The airbag is instantly inflated and deployed in the limited space between the occupant and the inner surface of the side door to protect the occupant from a secondary collision.

【0005】[0005]

【発明が解決しようとする課題】ところで、かかるサイ
ドエアバッグ装置において、サイドドア内等、狹い取付
スペースの解消と、エアバッグの展開状態の改善を計っ
て、前記サイドエアバッグ装置を乗員の座席側に収納す
る機構が開発され、現在既に実用化されている。このよ
うな形式のエアバッグ装置用収納機構にあっては、車輌
の衝突時に、これを覆うシートカバー類からエアバッグ
が突出して飛び出すことが必要であり、この状態を確実
に現出するためには、エアバッグを包むカバー類の縫合
線を微小な荷重によって素早く破断することが必須の要
件となる。
By the way, in such a side airbag device, the side airbag device can be used by an occupant by eliminating a narrow mounting space such as inside a side door and improving the deployment state of the airbag. A mechanism to store it in the seat has been developed and is already in practical use. In such a type of storage mechanism for an airbag device, at the time of collision of a vehicle, it is necessary that the airbag protrude from the seat covers that cover the vehicle and jump out. It is indispensable to quickly break a suture line of a cover enclosing an airbag by a small load.

【0006】又、前記縫合線はある程度の嵩高性と布帛
との摩擦性を要する。つまり布帛の重畳状態を安定して
維持するためにはこれらの要件も十分満たすことが必要
となる。
[0006] The above-mentioned suture line requires a certain amount of bulkiness and friction with the cloth. That is, in order to stably maintain the superimposed state of the fabric, it is necessary to sufficiently satisfy these requirements.

【0007】本発明は、サイドエアバッグ装置をサイド
ドア側ではなく乗員のシート側、特に背もたれ部に装着
した際に生ずる叙上の課題を解消することの出来るカバ
ー用縫糸、即ちサイドエアバッグ装置を包むカバー上に
設けた縫合線を衝突時には破裂し易く、又常時には形態
安定性の高い縫目にし得る縫糸の提供を目的とするもの
である。
SUMMARY OF THE INVENTION The present invention is directed to a cover sewing thread which can solve the above-mentioned problem that occurs when the side airbag device is mounted on the occupant's seat, not on the side door, but especially on the backrest, that is, the side airbag device. It is an object of the present invention to provide a sewing thread which can be easily ruptured at the time of a collision with a suture line provided on a cover enclosing the same, and which can always form a stitch with high form stability.

【0008】[0008]

【課題を解決するための手段】上記課題を解消するため
に、本発明の縫糸は次の構成を備えている。即ち請求項
1に記載する縫糸(以下縫糸Aと呼称する)は、強度の
異なる少なくとも二種のポリマーを芯鞘型に接合してな
り、芯部に低強度のポリマーを配した芯鞘型複合糸の単
糸により引張強度が5g/d未満の合成繊維のマルチフ
ィラメント糸を形成し、これをそのまま施撚して原糸と
なし、該原糸の複数本を元撚の逆方向にもろ撚してな
り、且つ前記単糸の横断面形状において、芯部が偏心し
て配置され、該芯部の外周が鞘部の外周面上に露出する
か、又は鞘部の外周面に接していることを特徴とする構
成である。
In order to solve the above problems, the sewing thread of the present invention has the following arrangement. That is, the sewing thread according to claim 1 (hereinafter referred to as sewing thread A) is a core-sheath composite in which at least two kinds of polymers having different strengths are joined in a core-sheath type, and a low-strength polymer is disposed in a core portion. A multifilament yarn of synthetic fiber having a tensile strength of less than 5 g / d is formed from a single yarn of the yarn and twisted as it is to form an original yarn, and a plurality of the original yarns are filtered in the reverse direction of the original twist. In the cross-sectional shape of the single yarn, the core portion is disposed eccentrically, and the outer periphery of the core portion is exposed on the outer peripheral surface of the sheath portion or is in contact with the outer peripheral surface of the sheath portion. It is a configuration characterized by the following.

【0009】又請求項2に記載する縫糸(以下縫糸Bと
呼称する)は、溶解性又は分解性の異なる少なくとも二
種のポリマーを芯鞘型に接合してなり、芯部に溶解性又
は分解性の大きいポリマーを配した芯鞘型複合糸の単糸
により引張強度が5g/d未満の合成繊維のマルチフィ
ラメント糸を形成し、これをそのまま施撚して原糸とな
し、該原糸の複数本を元撚の逆方向にもろ撚してなり、
且つ前記単糸の横断面形状において、芯部が偏心して配
置され、該芯部の外周が鞘部の外周面上に露出するか、
又は鞘部の外周面に接しており、更に芯部の少なくとも
一部を溶解又は分解する処理を施し、これを除去してな
ることを特徴とする構成である。
A sewing thread according to a second aspect (hereinafter referred to as a sewing thread B) is formed by joining at least two kinds of polymers having different solubility or decomposability into a core-sheath type, and dissolving or decomposing into a core portion. A multifilament yarn of a synthetic fiber having a tensile strength of less than 5 g / d is formed from a single yarn of a core-sheath type composite yarn provided with a polymer having a high property, and this is twisted as it is to form a raw yarn. Multiple strands are twisted in the opposite direction of the original twist,
And in the cross-sectional shape of the single yarn, the core portion is disposed eccentrically, or the outer periphery of the core portion is exposed on the outer peripheral surface of the sheath portion,
Alternatively, it is configured to be in contact with the outer peripheral surface of the sheath portion, to perform a treatment for dissolving or decomposing at least a part of the core portion, and to remove this.

【0010】[0010]

【発明の実施の形態】以下、本発明の具体的な実施形態
について添付図面を参照して説明する。縫糸A用とし
て、又縫糸B用として、夫々形成された各マルチフィラ
メント糸の芯鞘型複合糸の単糸は、本発明の中核となる
構成要素であって、その代表的な構成は図2に示すよう
に、繊維形成性ポリマーからなる実質的にC次形横断面
形状の鞘部3と、これの央部に位置し、縫糸A用にあっ
てはこれよりも低強度のポリマーで形成され、又縫糸B
にあってはこれよりも溶解性又は分解性の大きいポリマ
ーで形成された芯部2からなる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. The single yarn of the core-sheath composite yarn of each of the multifilament yarns formed for the sewing thread A and the sewing thread B is a core component of the present invention. As shown in the figure, a sheath 3 having a substantially C-order cross-sectional shape made of a fiber-forming polymer and a sheath 3 located at the center of the sheath 3 are formed of a lower strength polymer for the suture A. And sewing thread B
Is composed of a core 2 formed of a polymer having higher solubility or decomposability.

【0011】前記芯鞘型複合糸からなる単糸は、複数本
集束して合成繊維のマルチフィラメント糸を形成し、こ
のマルチフィラメント糸をそのまま所定数及び所定方向
(通常S方向)下に施撚することにより本発明に用いる
各原糸が得られる。縫糸A用の原糸を、更に、その複数
本(通常3本)を引き揃え、同時に元撚方向の逆方向に
所定撚数でもろ撚することにより、本発明の縫糸Aが得
られる。又縫糸B用の原糸を前記過程により縫糸にした
後、芯部の少なくとも一部を溶解又は分解してこの部分
を除去し、中洞化することにより本発明の縫糸Bが得ら
れる。
A plurality of single yarns comprising the core-sheath type composite yarn are bundled to form a multifilament yarn of synthetic fibers, and the multifilament yarn is twisted as it is in a predetermined number and in a predetermined direction (usually S direction). By doing so, each yarn used in the present invention is obtained. A plurality of (usually three) original yarns for the sewing thread A are further aligned and filtered at the same time in a direction opposite to the original twisting direction with a predetermined number of twists to obtain the sewing thread A of the present invention. Further, after the original thread for the sewing thread B is converted into a sewing thread by the above-described process, at least a part of the core is dissolved or decomposed to remove this part, and the sinus is formed, whereby the sewing thread B of the present invention is obtained.

【0012】構成単糸が夫々の芯鞘型複合糸からなる各
原糸は、前述の元撚或はもろ撚によりねじれ歪みが付与
され、鞘部側面に多数のクラックが生ずる。このクラッ
クが後述する本発明縫糸の破断の容易性に大きく寄与し
ている。 ここで、クラックとは芯鞘型複合糸の紡糸時
には存在しないが、それ以降の撚転工程等で生ずる機械
的歪みによって鞘部の縦方向(軸線方向)に形成される
亀裂を云う。
Each of the raw yarns, each of which is composed of a core-sheath type composite yarn, is twisted by the above-mentioned twisting or brittle twisting, and a number of cracks occur on the side surface of the sheath. This crack greatly contributes to the easiness of breaking of the sewing thread of the present invention described later. Here, the crack refers to a crack that does not exist during the spinning of the core-sheath type composite yarn, but is formed in the longitudinal direction (axial direction) of the sheath portion due to mechanical strain generated in a subsequent twisting step or the like.

【0013】亀裂発生を適度にするためには芯部形成用
ポリマーと鞘部形成用ポリマーの組合せが特に重要な問
題である。即ち、ねじれ歪みにより鞘部にクラッチが生
じ易いようなポリマーの組合せが必要であり、更に、縫
糸Bにあっては、得られる糸条の物性によって中空化処
理の要否、及びその度合が決定されるので、芯部ポリマ
ーが溶解又は分解除去されたとしても鞘部ポリマーが劣
化しないような組合せが必要である。
[0013] In order to make crack generation appropriate, a combination of a core-forming polymer and a sheath-forming polymer is a particularly important problem. In other words, it is necessary to use a combination of polymers that can easily cause clutching in the sheath due to torsional distortion. Further, in the case of the sewing thread B, the necessity of the hollowing process and the degree thereof are determined by the physical properties of the obtained thread. Therefore, a combination is required so that the sheath polymer does not deteriorate even if the core polymer is dissolved or decomposed and removed.

【0014】このような観点から、縫糸Aにも又縫糸B
にも使用し得る鞘部ポリマーとしては、繊維形成性のも
のであればあらゆるものが利用出来る。例えばポリオレ
フィン系、ポリビニル系、ポリアクリルニトリル系、ポ
リアミド系、ポリエステル系、ポリエーテル系、ポリカ
ーボネート系、ポリ尿素系、ポリウレタン系等の多数の
ポリマーが使用可能である。中でもポリアクリロニトリ
ル系、ポリアミド系及びポリエステル系のポリマーが有
用である。
From such a viewpoint, the sewing thread A and the sewing thread B
As the sheath polymer that can be used for the above, any polymer can be used as long as it is a fiber-forming polymer. For example, many polymers such as polyolefin, polyvinyl, polyacrylonitrile, polyamide, polyester, polyether, polycarbonate, polyurea, and polyurethane can be used. Among them, polyacrylonitrile-based, polyamide-based and polyester-based polymers are useful.

【0015】又、請求項1に記載する縫糸Aにおいて芯
部に用いるポリマーは鞘部よりも強度の低いポリマーで
あって、鞘部にポリエステル系、ポリアミド系のレギュ
ラーポリマーを用いた場合は、具体的には、イソフタル
酸、スルホン酸、ポリエチレングリコール等のポリアル
キレングリコール等を共重合せしめたものが挙げられ
る。これらの共重合ポリマーは、その共重合比率が高ま
るとポリマーの結晶構造が弱まり、その強度が低下す
る。より具体的には、イソフタル酸を20モル%以上共
重合したポリエチレンテレフタレート、スルホイソフタ
ル酸を数モル%以上共重合したポリエチレンテレフタレ
ート、これらに更に分子量数千程度のポリエチレングリ
コールを添加したもの等を挙げることができる。
In the sewing thread A according to the first aspect, the polymer used for the core portion is a polymer having lower strength than the sheath portion. Specific examples include those obtained by copolymerizing polyalkylene glycol such as isophthalic acid, sulfonic acid, and polyethylene glycol. When the copolymerization ratio of these copolymers is increased, the crystal structure of the polymer is weakened, and the strength is reduced. More specifically, polyethylene terephthalate in which isophthalic acid is copolymerized in an amount of 20 mol% or more, polyethylene terephthalate in which sulfoisophthalic acid is copolymerized in an amount of several mol% or more, and those further added with polyethylene glycol having a molecular weight of about several thousands are exemplified. be able to.

【0016】又、芯部に用いるポリマーは縫糸A、縫糸
Bの両者共、鞘部ポリマーと容易に複合紡糸可能であ
り、更に縫糸Bにあっては自体の芯部ポリマーの除去に
便利なものであればよく、特に限定されない。除去工程
に便利なものとしては、水で溶解可能なポリマー、アル
カリ水溶液で分解、溶解可能なポリマー、酸に溶解可能
なポリマー、非水系溶媒で溶解可能なポリマー等が挙げ
られ、特に、水、又はアルカリ水溶液で夫々溶解又は分
解可能なものが好適である。次にその具体例を示す。
The polymer used for the core can be easily combined with the sheath polymer for both the sewing thread A and the sewing thread B, and the sewing thread B is useful for removing the core polymer itself. There is no particular limitation as long as it is set. Convenient for the removal step include a polymer soluble in water, a polymer decomposable and dissolvable in an aqueous alkaline solution, a polymer soluble in an acid, a polymer soluble in a non-aqueous solvent, and the like. Alternatively, those which can be dissolved or decomposed in an aqueous alkali solution, respectively, are preferable. Next, a specific example will be described.

【0017】水で溶解可能なポリマーは多数あるが、例
えば、ポリエチレンオキシド、ポリエチレンオキシド/
ポリプロピレンオキシド共重合体、それらの誘導体、他
の重合体(例えばポリエステル又はポリアミド)セグメ
ントのセグメント共重合体等のポリアルキレンオキシド
系ポリマー、ポリビニルアルコール、ポリビニルピロリ
ドン、ポリアクリル酸塩等のポリビニル系ポリマー、ポ
リビスプロボキシ、エタンアジバミド、ポリビスプロボ
キシピペラジンアジバミド等の水溶性ポリアミド等が挙
げられる。
Although there are many water-soluble polymers, for example, polyethylene oxide, polyethylene oxide /
Polyalkylene oxide-based polymers such as polypropylene oxide copolymers, derivatives thereof, segment copolymers of other polymer (eg, polyester or polyamide) segments, polyvinyl-based polymers such as polyvinyl alcohol, polyvinylpyrrolidone, and polyacrylate, Water-soluble polyamides such as polybispropoxy, ethane adipamide and polybispropoxypiperazine adipamide can be used.

【0018】アルカリ水溶液で分解・溶解可能なポリマ
ーとしては、ポリエチレンテレフタレート、ポリブチレ
ンテレフタレート、ポリエチレンオキシベンゾエート等
の繊維形成性ポリエステル及びそれらの共重合体、変性
体等が挙げられる。
Examples of the polymer which can be decomposed and dissolved in an aqueous alkali solution include fiber-forming polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene oxybenzoate, and copolymers and modified products thereof.

【0019】特に、上記ポリエステルに1〜60%(重
量比)程度、好ましくは2〜30%、最も好ましくは5
〜20%のポリアルキレンオキシド類を共重合したもの
又は混合したものは、複合紡糸が容易で、アルカリ水溶
液により容易に分解され、且つその適度の柔らかさのた
め施撚等により鞘部にクラックを生ぜしめ易く、更に安
価且つ入手容易で、本発明の目的に最も有利なものの一
つである。
In particular, about 1 to 60% (weight ratio), preferably 2 to 30%, and most preferably 5%
Those obtained by copolymerizing or mixing 2020% of polyalkylene oxides are easy to composite spinning, are easily decomposed by an aqueous alkali solution, and have cracks in the sheath due to twisting or the like due to their moderate softness. It is easy to produce, cheaper and readily available, and is one of the most advantageous for the purposes of the present invention.

【0020】同様に芳香族ポリエステルに対して、低融
点(200℃以下)の脂肪族ポリエステルを5〜50%
程度、特に10〜30%程度混合したものも芯部ポリマ
ーとして極めて好適である。この目的に使用されるポリ
エステルとしては、ポリカプロラクトン等のポリラクト
ン類、ポリエチレンアジペート、ポリエチレンセバケー
ト、ポリブチレンアジペート、ポリブチレンセバケー
ト、ポリヘキサメチレンアジペート及びポリヘキサメチ
レンセバケート等のポリアルキレンアルキレート及びそ
れらの相互の共重合体や、他の成分との共重合体等が挙
げられる。
Similarly, 5 to 50% of an aliphatic polyester having a low melting point (200 ° C. or less) is added to an aromatic polyester.
A mixture of about 10% to about 30% is also very suitable as the core polymer. Polyesters used for this purpose include polylactones such as polycaprolactone, polyethylene adipate, polyethylene sebacate, polybutylene adipate, polybutylene sebacate, polyalkylene alkylates such as polyhexamethylene adipate and polyhexamethylene sebacate; Copolymers thereof and copolymers with other components are exemplified.

【0021】酸に溶解可能なポリマーの例としては6ナ
イロン、66ナイロン、610ナイロン、612ナイロ
ン、12ナイロン及びそれらの共重合物等のポリアミド
が挙げられる。非水系溶媒の例としては、トリクレン、
バークレン等の塩化物、トルエン、キシレン等の芳香族
化合物、ジメチルフォルムアミド、アセトン、等が挙げ
られ、これらに溶解可能なポリマーの例としては、ポリ
エチレン、ポリプロピレン、ポリスチレン、ポリ塩化ビ
ニル、ポリアクリロニトリル系ポリマー等が挙げられ
る。
Examples of the acid-soluble polymer include polyamides such as nylon 6, nylon 66, nylon 610, nylon 612, nylon 12, and copolymers thereof. Examples of non-aqueous solvents include trichlene,
Chloride such as Berklen, aromatic compounds such as toluene and xylene, dimethylformamide, acetone, and the like.Examples of polymers that can be dissolved therein include polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyacrylonitrile-based polymers. Polymers and the like.

【0022】前記ポリマーから形成された各芯鞘型複合
糸を構成単糸とする夫々のマルチフィラメント糸におい
て、撚転等のねじり歪みにより鞘部にクラッチの生ずる
確率は、両部の性質、特に力学的性質例えば硬さ(軟ら
かさ)、ねじり弾性率、圧縮弾性率、伸び弾性率、弾性
回復率等の差が大きいほど大きい。
In each of the multifilament yarns, each of which has a core-sheath type composite yarn formed from the above-described polymer and has a single yarn, the probability of occurrence of a clutch in the sheath due to torsional distortion such as twisting is determined by the properties of both portions, especially The greater the difference in mechanical properties such as hardness (softness), torsional elasticity, compressive elasticity, elongational elasticity, and elastic recovery, the greater.

【0023】又鞘成分にフイブリル化し易い繊維例えば
ポリプロピレン、ポリアクリルニトリル、ポリエチレン
テレフタレート或はそれらの変性体を用いる時もクラッ
クを生じ易い。芯成分と鞘成分の親和性が乏しい場合も
クラックを生じ易い。同じく、分子配向度が高いほどク
ラックを生じ易い。これに反して両成分の性質が近似し
ているとクラックを生じにくい。これらのことを考慮し
てクラックが適度に生じるような成分を組合わせる必要
がある。
Cracks are also likely to occur when fibers that are easily fibrillated such as polypropylene, polyacrylonitrile, polyethylene terephthalate, or a modified product thereof are used as the sheath component. Cracks are also likely to occur when the affinity between the core component and the sheath component is poor. Similarly, cracks are more likely to occur as the degree of molecular orientation is higher. On the other hand, if the properties of both components are similar, cracks are unlikely to occur. In view of the above, it is necessary to combine components that cause cracks appropriately.

【0024】芯部ポリマーと鞘部ポリマーからなる各芯
鞘型複合糸の紡糸は周知の方法で実施することが出来
る。前記芯鞘型複合糸の横断面形状の代表例を図2〜図
4に示す。図1は先に説明した図2に示す複合糸1に、
その芯部2を除去する中空化処理を施し、残余の鞘部3
のみで形成した縫糸Bの構成単糸を示す。
The spinning of each core-sheath type composite yarn comprising the core polymer and the sheath polymer can be carried out by a known method. Representative examples of the cross-sectional shape of the core-sheath composite yarn are shown in FIGS. FIG. 1 shows the composite yarn 1 shown in FIG.
A hollowing treatment for removing the core 2 is performed, and the remaining sheath 3 is removed.
The single thread constituting the sewing thread B formed only by the thread is shown.

【0025】通常、芯鞘型の複合糸1は円形の鞘部3中
に円形の芯部2を同心円状に配置した図5aの形状、或
は非円形の鞘部3中に非円形の芯部2を偏心して配置し
た図5bの形状等が多用されている。ところが、かかる
図5図示の形状ではクラックの発生が比較的困難なこと
から本発明の縫糸には適さない。
Usually, the core-sheath type composite yarn 1 has a shape shown in FIG. 5A in which a circular core portion 2 is arranged concentrically in a circular sheath portion 3, or a non-circular core portion is provided in a non-circular sheath portion 3. The shape shown in FIG. 5B in which the portion 2 is eccentrically arranged is frequently used. However, the shape shown in FIG. 5 is not suitable for the sewing thread of the present invention because cracks are relatively difficult to generate.

【0026】本発明においては、縫糸A及び縫糸B共、
芯部2及び鞘部3の円形、非円形を問わず、図3に示す
ように芯部2を偏心して配置し、該芯部2の外周4の一
部を鞘部3の外周面5上に露出させるか、又は図2、及
び図4a,b,cに示すように芯部2の外周4を鞘部3
の外周面5に接するように配置することが必要である。
尚図4cに示すように芯部2は複数でも良い。しかし芯
部2の数が多くなると複雑な複合紡糸口金を必要とする
ので、芯部の数は8以下、特に5以下が有利で、通常は
1〜3であり、1個が最も実用的である。
In the present invention, both the sewing thread A and the sewing thread B
Regardless of whether the core 2 and the sheath 3 are circular or non-circular, the core 2 is eccentrically arranged as shown in FIG. 3 and a part of the outer periphery 4 of the core 2 is placed on the outer peripheral surface 5 of the sheath 3. 2 or the outer periphery 4 of the core 2 is covered with the sheath 3 as shown in FIGS. 2 and 4a, 4b and 4c.
Must be arranged so as to be in contact with the outer peripheral surface 5.
Incidentally, as shown in FIG. 4c, the core 2 may be plural. However, when the number of cores 2 is large, a complicated composite spinneret is required, so the number of cores is preferably 8 or less, particularly 5 or less, usually 1 to 3, and 1 is most practical. is there.

【0027】本発明に用いる芯鞘型複合糸において、芯
鞘両部の夫々が占める体積比率(体積占有率)は、原糸
及び縫糸でのクラックの発生の容易さとその破断強度に
よって設定するが、通常芯部を全体の10〜90%の範
囲に、特に20〜80%の範囲に、最も多くの場合は3
0〜70%の範囲に設定する。
In the core-sheath type composite yarn used in the present invention, the volume ratio (volume occupancy) occupied by each of the core-sheath portions is determined by the ease of occurrence of cracks in the original thread and the sewing thread and the breaking strength thereof. Usually, the core is in the range of 10-90% of the whole, especially in the range of 20-80%, most often 3%.
Set in the range of 0 to 70%.

【0028】本発明の縫糸に用いる各マルチフィラメン
ト糸は、通常の合成繊維製ミシン糸の製法に従って縫糸
A又は縫糸Bに仕上げられる。即ち、マルチフィラメン
ト糸の総デニールは通常30〜150デニールの範囲、
フィラメント数は6〜75本の範囲であり、元撚方向は
特別な場合を除いてS撚、撚数はメートル当り500〜
1,300の範囲である。かかるマルチフィラメント糸
は前記の如く、その複数本(通常3本)が引き揃えら
れ、元撚である下撚の55〜85%の上撚でもって元撚
(下撚)方向の逆方向へ加撚することにより本発明の縫
糸A、及び中空化処理前の縫糸Bが得られる。
Each of the multifilament yarns used in the sewing thread of the present invention is finished into a sewing thread A or a sewing thread B in accordance with a general synthetic fiber sewing thread manufacturing method. That is, the total denier of the multifilament yarn is usually in the range of 30 to 150 denier,
The number of filaments is in the range of 6 to 75, and the direction of the original twist is S twist except for special cases, and the number of twists is 500 to
It is in the range of 1,300. As described above, the multifilament yarn is prepared by aligning a plurality of the yarns (usually three yarns) with a twist of 55 to 85% of the original twist (primary twist) in a direction opposite to the primary twist (primary twist) direction. By twisting, the sewing thread A of the present invention and the sewing thread B before hollowing treatment are obtained.

【0029】このようにして得られた本発明の縫糸は、
発生度数に相当の差があるものの、原糸及び縫糸の各製
造段階で夫々クラックが生ずることと、C字型横断面形
状等、表面の滑りを阻害する要因があることが湊合し
て、他の縫糸に比べて可縫性に劣る欠点がある。かかる
点の改善策として、本発明縫糸にあっては染色後等の最
終過程で通常塗布されている仕上油剤(シリコン+防電
剤)に替えて、シリコン+フレーク状ワックスの混合液
を使用している。
The sewing thread of the present invention thus obtained is
Although there is a considerable difference in the frequency of occurrence, cracks are generated at each stage of production of the original thread and the sewing thread, and there are factors that hinder surface slippage, such as a C-shaped cross-sectional shape. There is a disadvantage that the sewability is inferior to that of the sewing thread. As a remedy for this point, in the sewing thread of the present invention, a mixture of silicon and flake wax is used in place of the finishing oil (silicon and antistatic agent) usually applied in the final process such as after dyeing. ing.

【0030】尚、鞘部周壁に形成するクラックの形状
は、前記の通り、芯鞘両部のポリマーの種類、その横断
面形状、並びにこれに加えられるねじれ歪みの大小によ
って定まるが、その幅があまり小さいと縫糸の破断性が
低くなり本発明の目的を達成することが出来ない。従っ
て、クラックの幅は3〜0.1umの範囲であることが
好ましい。又クラックの数は、通常構成単糸の長さ1m
につき、10〜500個の範囲が好適であり、クラック
の長さが比較的長いものは数が少なくとも効果があり、
短いものは多数個を必要とする。通常クラック長の合計
は構成単糸の長さ1m当たり10〜100cmが好適で
ある。
As described above, the shape of the crack formed on the peripheral wall of the sheath portion is determined by the type of the polymer in both the core and the sheath, the cross-sectional shape thereof, and the magnitude of the torsional strain applied thereto. If it is too small, the breakability of the sewing thread will be low, and the object of the present invention cannot be achieved. Therefore, the width of the crack is preferably in the range of 3 to 0.1 μm. The number of cracks is usually 1 m in length of a single yarn.
Is preferably in the range of 10 to 500, and the crack having a relatively long length is at least effective in number,
Short ones need many. Usually, the total crack length is preferably 10 to 100 cm per 1 m of the length of the constituent single yarn.

【0031】上記構成からなる本発明の縫糸A及び縫糸
Bは、縫合部に高負荷が急激に加わった際、これに対応
してその糸目が直ちに破断するような縫合線、例えばエ
アバッグを収納するカバー類の製作用縫合線において、
エアバッグが膨張して展開する際、その膨張圧で破損
し、前記展開を助勢するような縫合線に特に使用され
る。
The sewing thread A and the sewing thread B according to the present invention having the above-described configuration accommodate stitching lines such as an airbag which breaks the thread immediately when a high load is suddenly applied to the stitching portion. In the production suture line of covers
When the airbag is inflated and deployed, it is particularly used for a suture line that breaks due to the inflation pressure and assists in the deployment.

【0032】図6はかかる縫合線の一例を示すもので、
乗員6のシートカバー7内にエアバッグ8が装着されて
おり、これが衝突時、シートカバー7の縫合線9を突き
破って図示仮想線の様に展開する。このような縫合線9
に本発明縫糸は使用される。
FIG. 6 shows an example of such a suture line.
The airbag 8 is mounted in the seat cover 7 of the occupant 6, and when the airbag 8 collides, the airbag 8 breaks through the stitching line 9 of the seat cover 7 and expands as shown by a virtual line in the drawing. Such suture line 9
The sewing thread of the present invention is used.

【0033】従来、かかるシートカバー類の縫製に使用
される合成繊維製の縫糸としては、主にポリエステルフ
ィラメントミシン糸或は手縫糸が使用されており、その
引張強度は6g/d以上、同伸度は20%以上要求され
ていた。ところがこのような物性ではエアバッグが起動
しても縫製が壊れず、瞬時の膨張とその作動に障害であ
った。ところが本発明縫糸を用いることにより、引張強
さは通常糸並か、やや劣る程度で、縫糸に外圧が加わっ
た際、繊維軸方向に形成されたクラックの裂目が拡大
し、引張強さが急激に低下し、縫糸自体の切断を引き起
こしてシートカバーの縫目に添って裂目が入り、この部
分からエアバッグを突出させることが可能となるのであ
る。以下実施例により、本発明縫糸を更に具体的に説明
する。
Conventionally, as a sewing thread made of synthetic fibers used for sewing such seat covers, a polyester filament sewing thread or a hand sewing thread has been mainly used, and its tensile strength is 6 g / d or more and the same elongation. The degree was required more than 20%. However, with such physical properties, even when the airbag is activated, the sewing is not broken, and the instantaneous inflation and its operation are obstructed. However, by using the sewing thread of the present invention, the tensile strength is about the same as that of a normal thread or slightly inferior.When an external pressure is applied to the sewing thread, the cracks formed in the fiber axis direction expand, and the tensile strength is reduced. As a result, the airbag suddenly drops, causing the suture itself to be cut, causing a tear along the seam of the seat cover, and allowing the airbag to protrude from this portion. Hereinafter, the sewing thread of the present invention will be described more specifically with reference to examples.

【0034】[0034]

【実施例】極限粘度0.65のポリエチレンテレフタレ
ート(以下PETと呼称する)を鞘部に用い、芯部ポリ
マーとして、スルホイソフタル酸金属塩を2モル%共重
合せしめ、分子量4,000のポリエチレングリコール
を10重量%添加した実質的に非晶質の変成PET(窒
素雰囲気下、10℃/分の昇温速度で加熱する示差熱分
析法では融点ピークが認められない)を用い、図2に示
す横断面形状と同一の複合比及び表面占有率を有する芯
鞘型複合糸を、285℃の温度下、直径0.25mmの
紡糸オリフイスから紡糸し、次いでこれを延伸工程等、
通常の後工程に経由せしめて75デニール/24フィラ
メントの延伸糸を得た。
EXAMPLE A polyethylene terephthalate having an intrinsic viscosity of 0.65 (hereinafter referred to as PET) was used for a sheath portion, and 2 mol% of a metal sulfoisophthalate was copolymerized as a core polymer to obtain polyethylene glycol having a molecular weight of 4,000. Is added (10% by weight), a substantially amorphous denatured PET (in a nitrogen atmosphere, a melting point peak is not recognized by a differential thermal analysis method of heating at a heating rate of 10 ° C./min) is shown in FIG. A core-sheath type composite yarn having the same composite ratio and surface occupancy as the cross-sectional shape is spun from a 0.25 mm diameter spinning orifice at a temperature of 285 ° C.
Through a usual post-process, a drawn yarn of 75 denier / 24 filament was obtained.

【0035】このマルチフィラメント糸にメートル当り
880回のS撚を施して本発明の原糸を製造し、次いで
この原糸3本を引き揃えてZ方向にメートル当り550
回の上撚(もろ撚)を施して中空化未処理の本発明縫糸
Aを得た。
The multifilament yarn is subjected to S-twisting 880 times per meter to produce a raw yarn of the present invention, and then the three raw yarns are aligned to obtain 550 per meter in the Z direction.
Twisted twisting (molly twisting) was performed to obtain hollow unprocessed sewing thread A of the present invention.

【0036】一方、前記本発明縫糸Aを、ノニオン系界
面活性剤を0.1%含む水酸化ナトリウム4%の水溶液
(温度80℃)中に60分浸漬して構成単糸中の芯部ポ
リマーを除去し、中空化処理済の本発明縫糸Bを得た。
On the other hand, the above-mentioned sewing thread A of the present invention was immersed in an aqueous solution of 4% sodium hydroxide containing 0.1% of nonionic surfactant (temperature: 80 ° C.) for 60 minutes to form the core polymer in the single yarn. Was removed to obtain hollow thread-treated thread B of the present invention.

【0037】上記二種の本発明縫糸A・Bの物性試験の
結果を表1に示す。
Table 1 shows the results of the physical property tests of the above two kinds of sewing threads A and B of the present invention.

【0038】[0038]

【表1】 [Table 1]

【0039】ポリエステルフィラメント縫糸の引張強度
は、通常デニール当り5.0〜7.0gである。これに
対して本発明が対象とする特定の縫合線用縫糸はデニー
ル当り5.0g未満、好ましくは3.0〜4.8gの範
囲であることを要する。本発明の縫糸は、縫糸A、縫糸
Bのいずれであっても、表1に示す通りかかる要件を十
分充足しており、又一方、通常時は、従来の縫糸と変わ
らない保形性を有するのである。
The tensile strength of the polyester filament thread is usually 5.0 to 7.0 g per denier. On the other hand, the specific suture thread targeted by the present invention needs to be less than 5.0 g per denier, preferably in the range of 3.0 to 4.8 g. The sewing thread of the present invention sufficiently satisfies such requirements as shown in Table 1 regardless of the sewing thread A or the sewing thread B. On the other hand, the thread has a shape retention property that is not different from the conventional thread at normal times. It is.

【0040】尚、参考までに、従来公知の構成単糸(丸
断面)からなるポリエステルフィラメントミシン糸の代
表的な物性試験の結果を次に示す。 構成素材 ポリエステル70d×3本 平均引張強度 1306.0g 平均引張強度 6.22g/d 最低10%強度 1267.0g 切断伸度 12.33%
For reference, the results of a typical physical property test of a polyester filament sewing thread composed of a conventionally known single yarn (round section) are shown below. Constituent material Polyester 70d x 3 Average tensile strength 1306.0 g Average tensile strength 6.22 g / d Minimum 10% strength 1267.0 g Cutting elongation 12.33%

【0041】[0041]

【発明の効果】本発明の縫糸を用いることにより、自動
車等の車輌用サイドエアバッグ装置において、これを従
来の如く、サイドドアーやアームレストに配置(特開平
5−38993号公報参照)したり、座席側に配置する
としてもプラスチック製箱に収納する(特開平6−48
262号公報参照)必要がなく、通常のシートカバー内
に容易に収納することが可能となり、エアバッグ装置の
取付位置を広範囲の領域で選ぶことが出来、更にその展
開状態を大きくすることが可能となる。
By using the thread of the present invention, in a side airbag device for a vehicle such as an automobile, it can be disposed on a side door or an armrest as in the prior art (see Japanese Patent Application Laid-Open No. 5-38993). Even if it is arranged on the seat side, it is stored in a plastic box (JP-A-6-48)
No. 262), there is no necessity, it can be easily stored in a normal seat cover, the mounting position of the airbag device can be selected in a wide range, and the deployment state can be further enlarged. Becomes

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に用いる芯鞘型複合繊維の一例を示すも
ので、中空化処理済繊維の横断面図である。
FIG. 1 is a cross-sectional view of an example of a core-sheath type conjugate fiber used in the present invention, which is a hollowed fiber.

【図2】図1に示す繊維の中空化未処理繊維を画いた横
断面図である。
FIG. 2 is a cross-sectional view of the hollow untreated fiber of the fiber shown in FIG.

【図3】本発明に用いる芯鞘型複合繊維の他例を示すも
ので、中空化未処理繊維の横断面図である。
FIG. 3 is a cross-sectional view of another example of the core-sheath composite fiber used in the present invention, which is a hollow untreated fiber.

【図4】同様に、芯鞘型複合繊維の他例を示すもので、
中空化未処理繊維の横断面図である。
FIG. 4 similarly shows another example of a core-sheath type composite fiber;
It is a cross-sectional view of a hollow untreated fiber.

【図5】従来の芯鞘型複合繊維の2例を示すもので、夫
々中空化未処理繊維の横断面である。
FIG. 5 shows two examples of a conventional core-sheath conjugate fiber, each of which is a cross section of a hollow untreated fiber.

【図6】本発明縫糸の使用箇所を示す斜視図である。FIG. 6 is a perspective view showing a used portion of the sewing thread of the present invention.

【符号の説明】[Explanation of symbols]

1 複合糸 2 芯部 3 鞘部 4 (芯部)外周 5 (鞘部)外周面 Reference Signs List 1 composite yarn 2 core 3 sheath 4 (core) outer periphery 5 (sheath) outer periphery

───────────────────────────────────────────────────── フロントページの続き (72)発明者 近村 勝雄 大阪市城東区鴫野西3丁目4番 京橋南コ ーポ2号311 (72)発明者 野口 章一郎 京都府相楽郡木津町兜台2−2−1 高の 原アーバンH−302 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuo Chikamura 3-4 Kyobashi Minami Corp. 3-4 Shigino Nishi, Joto-ku, Osaka-shi (72) Inventor Shoichiro Noguchi 2-2 Kizucho, Kazudai, Soraku-gun, Kyoto Prefecture -1 Takanohara Urban H-302

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 強度の異なる少なくとも二種のポリマー
を芯鞘型に接合してなり、芯部に低強度のポリマーを配
した芯鞘型複合糸の単糸により引張強度が5g/d未満
の合成繊維のマルチフィラメント糸を形成し、これをそ
のまま施撚して原糸となし、該原糸の複数本を元撚の逆
方向にもろ撚してなり、且つ前記単糸の横断面形状にお
いて、芯部が偏心して配置され、該芯部の外周が鞘部の
外周面上に露出するか、又は鞘部の外周面に接している
ことを特徴とする縫糸。
1. A single core-sheath composite yarn comprising at least two kinds of polymers having different strengths joined in a core-sheath type, wherein a low-strength polymer is disposed on the core, and having a tensile strength of less than 5 g / d. A multifilament yarn of a synthetic fiber is formed, this is directly twisted to form an original yarn, and a plurality of the original yarns are filtered and twisted in a direction opposite to the original twist, and in a cross-sectional shape of the single yarn. A core portion disposed eccentrically, and an outer periphery of the core portion being exposed on an outer peripheral surface of the sheath portion or being in contact with an outer peripheral surface of the sheath portion.
【請求項2】 溶解性又は分解性の異なる少なくとも二
種のポリマーを芯鞘型に接合してなり、芯部に溶解性又
は分解性の大きいポリマーを配した芯鞘型複合糸の単糸
により引張強度が5g/d未満の合成繊維のマルチフィ
ラメント糸を形成し、これをそのまま施撚して原糸とな
し、該原糸の複数本を元撚の逆方向にもろ撚してなり、
且つ前記単糸の横断面形状において、芯部が偏心して配
置され、該芯部の外周が鞘部の外周面上に露出するか、
又は鞘部の外周面に接しており、更に芯部の少なくとも
一部を溶解又は分解する処理を施し、これを除去してな
ることを特徴とする縫糸。
2. A core-sheath type composite yarn comprising at least two kinds of polymers having different solubility or degradability joined in a core-sheath type, and a polymer having high solubility or degradability disposed in a core portion. A multifilament yarn of a synthetic fiber having a tensile strength of less than 5 g / d is formed and twisted as it is to form an original yarn, and a plurality of the original yarns are filtered and twisted in the reverse direction of the original twist,
And in the cross-sectional shape of the single yarn, the core is disposed eccentrically, the outer periphery of the core is exposed on the outer peripheral surface of the sheath,
Alternatively, a sewing thread which is in contact with the outer peripheral surface of the sheath portion, is subjected to a treatment for dissolving or decomposing at least a part of the core portion, and is removed.
JP11884797A 1997-04-21 1997-04-21 Sewing yarn Pending JPH10298841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11884797A JPH10298841A (en) 1997-04-21 1997-04-21 Sewing yarn

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11884797A JPH10298841A (en) 1997-04-21 1997-04-21 Sewing yarn

Publications (1)

Publication Number Publication Date
JPH10298841A true JPH10298841A (en) 1998-11-10

Family

ID=14746628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11884797A Pending JPH10298841A (en) 1997-04-21 1997-04-21 Sewing yarn

Country Status (1)

Country Link
JP (1) JPH10298841A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002227050A (en) * 2001-01-29 2002-08-14 Toray Ind Inc Sewing yarn

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002227050A (en) * 2001-01-29 2002-08-14 Toray Ind Inc Sewing yarn

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