JP2007170674A - Expanded graphite knitting yarn - Google Patents

Expanded graphite knitting yarn Download PDF

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JP2007170674A
JP2007170674A JP2007025460A JP2007025460A JP2007170674A JP 2007170674 A JP2007170674 A JP 2007170674A JP 2007025460 A JP2007025460 A JP 2007025460A JP 2007025460 A JP2007025460 A JP 2007025460A JP 2007170674 A JP2007170674 A JP 2007170674A
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expanded graphite
knitting yarn
width direction
graphite tape
tape
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JP4759526B2 (en
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Masaru Fujiwara
優 藤原
Takahisa Ueda
隆久 上田
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Nippon Pillar Packing Co Ltd
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Nippon Pillar Packing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce or prevent peeling off of expanded graphite particles during braiding, thereby to improve the pressure resistance property of gland packing. <P>SOLUTION: An expanded graphite tape 2 having a predetermined width is covered by a reinforcement material consisting of a knitting body on its outer periphery, and is folded inward in the longitudinal direction. Both ends 2a and 2b in the width direction of the expanded graphite tape 2 are folded to turn inward in the width direction. The expanded graphite tape 2 is covered with the reinforcing material 3 consisting of the stainless steel wire knitting body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、流体機器の軸封部などに用いるグランドパッキンの膨張黒鉛製編み糸に関する。   The present invention relates to an expanded graphite knitting yarn of a gland packing used for a shaft seal portion of a fluid device.

従来、たとえば、流体機器の軸封部などに用いるグランドパッキンの編み糸として、図８に示す編み糸１が知られている。この編み糸１は、所定幅の膨張黒鉛テープ２を長手方向に谷折りに折り畳んでおり、その外周に金属線の編組体よりなる補強材３が被覆されているものである。   Conventionally, for example, a knitting yarn 1 shown in FIG. 8 is known as a knitting yarn of a gland packing used for a shaft seal portion of a fluid device. The knitting yarn 1 is obtained by folding an expanded graphite tape 2 having a predetermined width into a valley fold in the longitudinal direction, and the outer periphery thereof is covered with a reinforcing material 3 made of a braided body of metal wires.

前記編み糸１を複数本集束して編組することにより、グラントパッキンが製造される。ところが、膨張黒鉛テープ２は引張り強さが弱く脆い性質を有している上に、幅方向両端部２ａ，２ｂの縁は、膨張黒鉛粒子間の耐剥落性が小さい。このため、編組時に、幅方向両端部２ａ，２ｂの縁に大きい引張力、剪断力が作用した場合、幅方向両端部２ａ，２ｂの縁から亀裂を生じ、幅方向両端部２ａ，２ｂの縁およびその近くの膨張黒鉛粒子が剥落する。したがって、複数本の編み糸を編組する時に大きな引張り力をかけられず、編み糸の引張り力が小さく制限されることになって、グランドパッキンの耐圧性を高めることができない。   Grant packing is manufactured by bundling a plurality of the knitting yarns 1 together. However, the expanded graphite tape 2 has a weak tensile strength and is brittle, and the edges of both ends 2a and 2b in the width direction have a low resistance to exfoliation between the expanded graphite particles. For this reason, when a large tensile force or shearing force is applied to the edges of the width direction both ends 2a and 2b during braiding, a crack is generated from the edges of the width direction both ends 2a and 2b, and the edges of the width direction both ends 2a and 2b And the expanded graphite particles in the vicinity thereof peel off. Therefore, a large tensile force cannot be applied when braiding a plurality of knitting yarns, and the tensile force of the knitting yarns is limited to a small value, so that the pressure resistance of the gland packing cannot be increased.

そこで、本発明は、編組時における膨張黒鉛粒子の剥落を減少または防止して、グランドパッキンの耐圧性を高めることができる膨張黒鉛製編み糸を提供することを目的としている。   Accordingly, an object of the present invention is to provide an expanded graphite knitting yarn capable of reducing or preventing exfoliation of expanded graphite particles during braiding and improving the pressure resistance of the gland packing.

前記目的を達成するために、請求項１に記載の発明に係る膨張黒鉛製編み糸は、折り曲げられた膨張黒鉛テープの外周に編組体よりなる補強材が接着剤なしに被覆されている膨張黒鉛製編み糸において、前記膨張黒鉛テープの幅方向の両端部が編み糸の幅方向内方に向くように折り曲げられていることを特徴としている。     In order to achieve the above object, the expanded graphite knitting yarn according to the first aspect of the present invention is an expanded graphite in which a reinforcing material made of a braided body is coated without an adhesive on the outer periphery of a folded expanded graphite tape. The knitting yarn is characterized in that both ends of the expanded graphite tape in the width direction are bent so as to face inward in the width direction of the knitting yarn.

また、請求項２に記載の発明に係る膨張黒鉛製編み糸は、ひねり加工された膨張黒鉛テープの外周に編組体よりなる補強材が接着剤なしに被覆されている膨張黒鉛製編み糸において、前記膨張黒鉛テープの幅方向の両端部が編み糸の幅方向内方に向くように折り曲げられていることを特徴としている。   The expanded graphite knitting yarn according to the invention of claim 2 is an expanded graphite knitting yarn in which a reinforcing material made of a braided body is coated without an adhesive on the outer periphery of a twisted expanded graphite tape, Both ends of the expanded graphite tape in the width direction are bent so as to face inward in the width direction of the knitting yarn.

さらに、請求項３に記載の発明に係る膨張黒鉛製編み糸は、前記膨張黒鉛テープに補強繊維が埋設されていることを特徴としている。   Furthermore, the expanded graphite knitting yarn according to the invention described in claim 3 is characterized in that a reinforcing fiber is embedded in the expanded graphite tape.

また、請求項４に記載の発明に係る膨張黒鉛製編み糸は、前記膨張黒鉛テープの表面側の膨張黒鉛粒子の一部が除去されていることを特徴としている。   The expanded graphite knitting yarn according to the invention of claim 4 is characterized in that a part of the expanded graphite particles on the surface side of the expanded graphite tape is removed.

請求項１，２に記載の発明によれば、編組時の引張り力やねじり力により起こる折り曲げられたまたひねり加工された膨張黒鉛テープの切断が、その外周に被覆した補強材によって有効に防止されるのは勿論であるが、さらに、その膨張黒鉛テープの幅方向の両端部が幅方向内方に向くように折曲げられているため、編組時において、これら両端部の縁に直接大きな引張力や剪断力が作用せず、両端部の縁からの亀裂の発生および亀裂の発生に伴なう膨張黒鉛粒子の剥落を確実に減少させることができる。これにより、より大きい引張り力での編組も可能になり、グランドパッキンの耐圧性を高めることができる。   According to the first and second aspects of the invention, cutting of the bent and twisted expanded graphite tape caused by the tensile force and twisting force during braiding is effectively prevented by the reinforcing material coated on the outer periphery thereof. Of course, since both ends in the width direction of the expanded graphite tape are bent so as to face inward in the width direction, a large tensile force is directly applied to the edges of both ends during braiding. Further, no shearing force acts, and the occurrence of cracks from the edges at both ends and the exfoliation of the expanded graphite particles accompanying the occurrence of cracks can be reliably reduced. As a result, braiding with a larger tensile force is possible, and the pressure resistance of the gland packing can be increased.

請求項３に記載の発明によれば、補強繊維が膨張黒鉛テープに埋設されていることにより、膨張黒鉛テープの引張り強度とひねり強度を向上させることができる。   According to the invention described in claim 3, the tensile strength and the twist strength of the expanded graphite tape can be improved because the reinforcing fiber is embedded in the expanded graphite tape.

請求項４に記載の発明によれば、膨張黒鉛テープの表面側における亀裂の起こし易い高密度で高配向された膨張黒鉛粒子の一部がブラスト加工によって除去されることにより、編組時において膨張黒鉛テープに大きい引張力が作用しても、一層確実に亀裂の発生および亀裂の発生に伴なう膨張黒鉛粒子の剥落を減少させることができる。   According to the fourth aspect of the present invention, a part of the expanded graphite particles with high density and high orientation, which are easily cracked on the surface side of the expanded graphite tape, are removed by blasting, so that the expanded graphite at the time of braiding is removed. Even when a large tensile force is applied to the tape, the occurrence of cracks and the exfoliation of expanded graphite particles accompanying the occurrence of cracks can be more reliably reduced.

以上説明したように、請求項１または請求項２に記載の発明によれば、編組時において、膨張黒鉛テープの端部の縁から膨張黒鉛粒子が剥落するのを減少または防止することができる。このため、より大きな引張り力で編み糸を編組することができて、グランドパッキンの耐圧性を高めることができる。   As described above, according to the invention described in claim 1 or claim 2, it is possible to reduce or prevent the expanded graphite particles from peeling off from the edge of the end portion of the expanded graphite tape during braiding. For this reason, the knitting yarn can be braided with a larger tensile force, and the pressure resistance of the gland packing can be improved.

請求項３に記載の発明によれば、膨張黒鉛テープの引張り強度とひねり強度が向上して、より大きな引張り力で編み糸を編組することができる。   According to the third aspect of the present invention, the tensile strength and twist strength of the expanded graphite tape are improved, and the knitting yarn can be braided with a larger tensile force.

請求項４に記載の発明によれば、一層確実に膨張黒鉛粒子の剥落を減少または防止することができる。   According to the fourth aspect of the present invention, exfoliation of the expanded graphite particles can be reduced or prevented more reliably.

以下、本発明の好適な実施の形態を図面に基づいて説明する。図１は、請求項１に記載の発明に係る膨張黒鉛製編み糸の一実施の形態を示す斜視図であり、この図において、膨張黒鉛製編み糸１は、所定幅の膨張黒鉛テープ２が長手方向に谷折りに折り曲げられているとともに、膨張黒鉛テープ２の幅方向の両端部２ａ，２ｂが該膨張黒鉛テープ２の幅方向内方に向くように折り曲げられ、その外周にステンレス線の網目を有する編組体よりなる補強材３が接着剤なしに被覆されているものである。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of an expanded graphite knitting yarn according to the first aspect of the present invention. In this drawing, the expanded graphite knitting yarn 1 includes an expanded graphite tape 2 having a predetermined width. It is bent in a valley fold in the longitudinal direction, and both end portions 2a, 2b in the width direction of the expanded graphite tape 2 are bent so as to face inward in the width direction of the expanded graphite tape 2, and a stainless wire mesh is formed on the outer periphery thereof. A reinforcing member 3 made of a braided body having a coating is coated without an adhesive.

なお、膨張黒鉛テープ２の長手方向の折り曲げおよび膨張黒鉛テープ２の幅方向内方への端部２ａ，２ｂの折り曲げは、少なくとも編組時になされていればよいものである。したがって、例えば編組前に予め前記膨張黒鉛テープ２をＶ字状に曲げるとともに、その両端部２ａ，２ｂを膨張黒鉛テープ２の幅方向内方に軽く曲げておいて、編組時に、前記膨張黒鉛テープ２およびその端部２ａ，２ｂを完全に折り曲げてもよい。また、折り曲げる前記端部の形状としては、カール状、渦巻き状、Ｕ字状、その他の形状であってもよい。   The bending of the expanded graphite tape 2 in the longitudinal direction and the bending of the end portions 2a and 2b inward in the width direction of the expanded graphite tape 2 may be performed at least during braiding. Therefore, for example, the expanded graphite tape 2 is bent in a V shape in advance before braiding, and both ends 2a and 2b are lightly bent inward in the width direction of the expanded graphite tape 2, so that the expanded graphite tape is used during braiding. 2 and its end portions 2a and 2b may be completely bent. Further, the shape of the end portion to be bent may be a curl shape, a spiral shape, a U shape, or other shapes.

また、膨張黒鉛テープ２の外周にステンレス線の網目を有する編組体よりなる補強材３を被覆する態様としては、前記図示例の他に、図２（ａ）に示すように、補強材３の一部が膨張黒鉛テープ２の幅方向の両端部２ａ，２ｂの間に介在している構造でもよい。   Moreover, as an aspect which coat | covers the reinforcing material 3 which consists of a braided body which has the mesh | network of the stainless steel wire on the outer periphery of the expanded graphite tape 2, as shown to Fig.2 (a), as shown in FIG. A structure in which a part is interposed between both end portions 2a and 2b in the width direction of the expanded graphite tape 2 may be employed.

さらに、膨張黒鉛テープ２は１枚の場合に限らず、複数枚の膨張黒鉛テープ２を重ねて、それらの膨張黒鉛テープ２の幅方向の両端部２ａ，２ｂが該膨張黒鉛テープ２の幅方向内方に向くように折り曲げてもよい。   Furthermore, the expanded graphite tape 2 is not limited to a single sheet, but a plurality of expanded graphite tapes 2 are stacked, and both ends 2a and 2b in the width direction of the expanded graphite tape 2 are in the width direction of the expanded graphite tape 2. You may bend it so that it may face inward.

図３は、請求項２に記載の発明に係る膨張黒鉛製編み糸の一実施の形態を示す斜視図であり、この図において、膨張黒鉛製編み糸１は、所定幅の膨張黒鉛テープ２の幅方向の両端部２ａ，２ｂが該膨張黒鉛テープ２の幅方向内方に向くように折り曲げられてひねり加工され、その外周にステンレス線の網目を有する編組体よりなる補強材３が被覆されているものである。   FIG. 3 is a perspective view showing an embodiment of an expanded graphite knitting yarn according to the second aspect of the invention. In this drawing, the expanded graphite knitting yarn 1 is an expanded graphite tape 2 having a predetermined width. Both ends 2a, 2b in the width direction are bent and twisted so as to face inward in the width direction of the expanded graphite tape 2, and the outer periphery thereof is covered with a reinforcing material 3 made of a braided body having a mesh of stainless wire. It is what.

なお、膨張黒鉛テープ２の幅方向内方への両端部２ａ，２ｂの折り曲げは、少なくとも編組時になされていればよいものである。したがって、例えばひねり加工前またはひねり加工時に予め前記両端部２ａ，２ｂを膨張黒鉛テープ２の幅方向内方に軽く曲げておいて、編組時に、前記両端部２ａ，２ｂを完全に折り曲げるようにしてもよい。また、折り曲げる前記端部２ａ，２ｂの形状としては、カール状、渦巻き状、Ｕ字状、その他の形状であってもよい。   In addition, the bending of the both end portions 2a and 2b inward in the width direction of the expanded graphite tape 2 only needs to be performed at least during braiding. Therefore, for example, the ends 2a and 2b are lightly bent inward in the width direction of the expanded graphite tape 2 before or during the twisting process, and the ends 2a and 2b are completely bent at the time of braiding. Also good. Further, the shape of the end portions 2a and 2b to be bent may be a curl shape, a spiral shape, a U shape, or other shapes.

さらに、膨張黒鉛テープ２は１枚の場合に限らず、複数枚の膨張黒鉛テープ２を重ねて、それらの膨張黒鉛テープ２の幅方向の端部２ａ，２ｂが該膨張黒鉛テープ２の幅方向内方に向くようにひねり加工してもよい。   Furthermore, the expanded graphite tape 2 is not limited to a single sheet, but a plurality of expanded graphite tapes 2 are stacked, and ends 2a and 2b in the width direction of the expanded graphite tape 2 are in the width direction of the expanded graphite tape 2. You may twist it so that it may face inward.

前記補強材３の材料として、前記各実施の形態で使用しているステンレス線の他に、インコネル，モネルなどの金属線、木綿，レーヨン，フエノール，アラミド，ＰＢＯ，ＰＢＩ，ＰＴＦＥ，ＰＰＳ，ＰＥＥＫなどの有機繊維、炭素繊維，セラミック繊維などの無機繊維などを使用することができる。   In addition to the stainless steel wires used in each of the above embodiments, the reinforcing material 3 is made of metal wires such as Inconel and Monel, cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, PEEK, etc. Inorganic fibers such as organic fibers, carbon fibers, and ceramic fibers can be used.

図４（ａ），（ｂ）は、請求項３に記載の発明に係る膨張黒鉛製編み糸の一実施の形態を示す斜視図であり、この図において、前記請求項１および２の発明における実施の形態と異なる点は、膨張黒鉛テープ２に、幅方向の間隔を隔てて複数本の補強繊維４が長手方向に埋設されている点である。   4 (a) and 4 (b) are perspective views showing an embodiment of an expanded graphite knitting yarn according to the invention of claim 3, and in this figure, in the invention of claims 1 and 2 above. The difference from the embodiment is that a plurality of reinforcing fibers 4 are embedded in the expanded graphite tape 2 in the longitudinal direction at intervals in the width direction.

補強繊維４として、木綿，レーヨン，フエノール，アラミド，ＰＢＯ，ＰＢＩ，ＰＴＦＥ，ＰＰＳ，ＰＥＥＫなどの有機繊維の中から選択された１つもしくはガラス繊維，炭素繊維，セラミック繊維などの無機繊維の中から選択された１つ、またはステンレス，インコネル，モネルなどの金属線の中から選択された１つが使用される。勿論、前記有機繊維、無機繊維および金属線を適宜選択して複合使用してもよい。   As the reinforcing fiber 4, one selected from organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, and PEEK, or inorganic fibers such as glass fiber, carbon fiber, and ceramic fiber The selected one or one selected from metal wires such as stainless steel, inconel, monel, etc. is used. Of course, the organic fiber, the inorganic fiber, and the metal wire may be appropriately selected and used in combination.

図５（ａ），（ｂ）は、請求項４に記載の発明に係る膨張黒鉛製編み糸の一実施の形態を示す斜視図であり、この図において、前記請求項１および２の発明における実施の形態と異なる点は、膨張黒鉛テープ２の表面側における高密度で高配向された膨張黒鉛粒子の一部がブラスト加工により除去されている点である。   5 (a) and 5 (b) are perspective views showing an embodiment of an expanded graphite knitting yarn according to the invention of claim 4, and in this figure, in the invention of claims 1 and 2. The difference from the embodiment is that a part of the expanded graphite particles with high density and high orientation on the surface side of the expanded graphite tape 2 are removed by blasting.

膨張黒鉛テープ２の表面側における高密度で高配向された膨張黒鉛粒子は、該粒子よりも小径の粒子によるマイクロブラスト加工によって除去される。すなわち、具体的には、たとえば、膨張黒鉛テープ２の外面から１５０ｍｍ離れた位置から、２Ｋｇ／ｃｍ２の空気圧によって、ＳｉＣ等の微粒子（例えば粒子径１５μｍ）でブラストされる。このように、マイクロブラスト加工を施すことで、膨張黒鉛テープ２の表面５は、亀裂の発生と成長を起こし易い膨張黒鉛粒子が除去され、３０〜４０ｇの範囲であったブラスト加工前の膨張黒鉛粒子の耐剥離強度が１４０〜１５０ｇの範囲に増大させることができる。 High-density and highly-oriented expanded graphite particles on the surface side of the expanded graphite tape 2 are removed by microblasting with particles having a smaller diameter than the particles. Specifically, for example, blasting is performed with fine particles such as SiC (for example, a particle diameter of 15 μm) by air pressure of 2 kg / cm 2 from a position 150 mm away from the outer surface of the expanded graphite tape 2. In this way, the surface 5 of the expanded graphite tape 2 is subjected to microblasting to remove expanded graphite particles that are prone to cracking and growth, and the expanded graphite before blasting was in the range of 30 to 40 g. The peel resistance of the particles can be increased to the range of 140 to 150 g.

なお、図５（ａ），（ｂ）は、前記請求項１および２に記載の発明における実施の形態にブラスト加工を適用した例であるが、勿論、請求項３の実施の形態にブラスト加工を適用してもよいものである。   5 (a) and 5 (b) are examples in which blasting is applied to the embodiment of the invention described in claims 1 and 2, of course, blasting is applied to the embodiment of claim 3. May be applied.

請求項１に記載の発明の一実施の形態を示す斜視図である。It is a perspective view which shows one Embodiment of invention of Claim 1. 請求項１に記載の発明の他の実施の形態を示す拡大断面図である。It is an expanded sectional view which shows other embodiment of the invention of Claim 1. 請求項２に記載の発明の一実施の形態を示す斜視図である。It is a perspective view which shows one Embodiment of invention of Claim 2. FIG. 請求項３に記載の発明の実施の形態を示す斜視図である。It is a perspective view which shows embodiment of the invention of Claim 3. 請求項４に記載の発明の実施の形態を示す斜視図である。It is a perspective view which shows embodiment of the invention of Claim 4. 従来の膨張黒鉛製編み糸の一例を示す斜視図である。It is a perspective view which shows an example of the conventional expanded graphite knitting yarn.

符号の説明Explanation of symbols

１ 編み糸
２ 膨張黒鉛テープ
２ａ 膨張黒鉛テープの一端部
２ｂ 膨張黒鉛テープの他端部
３ 補強材
４ 補強繊維
５ ブラスト加工により除去された膨張黒鉛テープの表面 DESCRIPTION OF SYMBOLS 1 Knitting yarn 2 Expanded graphite tape 2a One end part of expanded graphite tape 2b Other end part of expanded graphite tape 3 Reinforcing material 4 Reinforcing fiber 5 Surface of expanded graphite tape removed by blasting

Claims (4)

折り曲げられた膨張黒鉛テープの外周に編組体よりなる補強材が接着剤なしに被覆されている膨張黒鉛製編み糸において、前記膨張黒鉛テープの幅方向の両端部が編み糸の幅方向内方に向くように折り曲げられていることを特徴とする膨張黒鉛製編み糸。   In an expanded graphite knitting yarn in which a reinforcing material made of a braided body is coated without an adhesive on the outer periphery of a folded expanded graphite tape, both ends in the width direction of the expanded graphite tape are inward in the width direction of the knitting yarn. An expanded graphite knitting yarn which is bent so as to face. ひねり加工された膨張黒鉛テープの外周に編組体よりなる補強材が接着剤なしに被覆されている膨張黒鉛製編み糸において、前記膨張黒鉛テープの幅方向の両端部が編み糸の幅方向内方に向くように折り曲げられていることを特徴とする膨張黒鉛製編み糸。   In an expanded graphite knitting yarn in which a reinforcing material made of a braid is coated without an adhesive on the outer periphery of a twisted expanded graphite tape, both ends in the width direction of the expanded graphite tape are inward in the width direction of the knitting yarn An expanded graphite knitting yarn, which is bent so as to face. 前記膨張黒鉛テープに補強繊維が埋設されていることを特徴とする請求項１、請求項２のいずれかに記載の膨張黒鉛製編み糸。   The expanded graphite knitting yarn according to any one of claims 1 and 2, wherein reinforcing fibers are embedded in the expanded graphite tape. 前記膨張黒鉛テープの表面側の膨張黒鉛粒子の一部が除去されていることを特徴とする請求項１、請求項２、請求項３のいずれかに記載の膨張黒鉛製編み糸。   4. The expanded graphite knitting yarn according to claim 1, wherein a part of the expanded graphite particles on the surface side of the expanded graphite tape is removed.
JP2007025460A 2007-02-05 2007-02-05 Expanded graphite knitting yarn Expired - Fee Related JP4759526B2 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0425671A (en) * 1990-05-16 1992-01-29 Nippon Pillar Packing Co Ltd Grand packing
JPH0448463A (en) * 1990-06-14 1992-02-18 Matsushita Electric Ind Co Ltd Tape post
JPH04245961A (en) * 1990-09-20 1992-09-02 Shinsozai Hanbai Kk Braided body of expanding graphite and production thereof
JPH06279753A (en) * 1993-03-26 1994-10-04 Nippon Pillar Packing Co Ltd Packing material
JPH07118627A (en) * 1993-09-06 1995-05-09 Nippon Pillar Packing Co Ltd Sheet for gasket and its production
GB2285067A (en) * 1993-12-22 1995-06-28 T & N Technology Ltd Gland packing yarn
JPH1025172A (en) * 1996-07-05 1998-01-27 Nippon Pillar Packing Co Ltd Seal raw material made of expanded graphite and its production
JPH10231110A (en) * 1997-02-24 1998-09-02 Nippon Pillar Packing Co Ltd Expanded graphite sheet and gland packing using the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0425671A (en) * 1990-05-16 1992-01-29 Nippon Pillar Packing Co Ltd Grand packing
JPH0448463A (en) * 1990-06-14 1992-02-18 Matsushita Electric Ind Co Ltd Tape post
JPH04245961A (en) * 1990-09-20 1992-09-02 Shinsozai Hanbai Kk Braided body of expanding graphite and production thereof
JPH06279753A (en) * 1993-03-26 1994-10-04 Nippon Pillar Packing Co Ltd Packing material
JPH07118627A (en) * 1993-09-06 1995-05-09 Nippon Pillar Packing Co Ltd Sheet for gasket and its production
GB2285067A (en) * 1993-12-22 1995-06-28 T & N Technology Ltd Gland packing yarn
JPH1025172A (en) * 1996-07-05 1998-01-27 Nippon Pillar Packing Co Ltd Seal raw material made of expanded graphite and its production
JPH10231110A (en) * 1997-02-24 1998-09-02 Nippon Pillar Packing Co Ltd Expanded graphite sheet and gland packing using the same

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