WO2017115399A1 - Spiral gasket - Google Patents

Spiral gasket Download PDF

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Publication number
WO2017115399A1
WO2017115399A1 PCT/JP2015/086458 JP2015086458W WO2017115399A1 WO 2017115399 A1 WO2017115399 A1 WO 2017115399A1 JP 2015086458 W JP2015086458 W JP 2015086458W WO 2017115399 A1 WO2017115399 A1 WO 2017115399A1
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filler material
inorganic
weight
gasket
spiral wound
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PCT/JP2015/086458
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French (fr)
Japanese (ja)
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聡 中里
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日本バルカー工業株式会社
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering

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  • the present invention relates to a spiral wound gasket, and more particularly to a spiral wound gasket using inorganic fibers as a filler material of a gasket body.
  • non-metallic gaskets there are three types: non-metallic gaskets, semi-metal gaskets, and metal gaskets.
  • the semimetal gasket can be used under high pressure conditions where a non-metallic gasket cannot be used.
  • Metal gaskets can be used under high pressure conditions, but they require high dimensional accuracy and are hard to tighten. For these reasons, use under special conditions is common.
  • the semi-metal gasket can be used under high pressure conditions, and is easy to process and handle, and is generally used as a gasket used under high pressure.
  • the spiral wound gasket is one of the typical gaskets among the semimetal gaskets.
  • the spiral wound gasket used under high pressure conditions is composed of a filler material and a hoop material.
  • the spiral wound gasket has a structure as shown in FIG. That is, in the spiral wound gasket, the filler material 1 and the hoop material 2 made of a thin metal tape having a V-shaped cross section are overlapped and wound in a spiral shape, and the winding start and end are wound.
  • the gasket body 10 is formed by performing two or three rounds of idle winding with only 2 and fixing them by spot welding or the like.
  • the inner ring ring member 3 made of an annular metal plate is fixed to the inner peripheral edge of the gasket body 10 as a guide member by fitting it. Further, an outer ring member 4 made of an annular metal plate is fixed to the outer peripheral edge of the gasket body 10 as a guide member by fitting.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2011-144881
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2007-127178
  • Patent Document 3 JP-A-7-305772
  • ⁇ Sheets mainly made of mica can be used up to a high temperature range, but the sealing performance at room temperature is poor. Further, the expanded graphite sheet has good sealing properties at room temperature, but expanded graphite is soft and easily damaged. For this reason, there is a possibility that the formation of a leak path due to scratches and the defect rate may be improved, and there is a problem in workability and handling.
  • a sheet containing inorganic fibers has a relatively strong strength as a filler material, is hardly scratched, and is excellent in workability and handling. Moreover, although there exists an advantage which has the sealing performance more than mica, it does not have the normal temperature sealing performance comparable to expanded graphite.
  • the present invention has been made in view of the above-mentioned problems in the prior art, and has a room temperature sealing property with a small leak path when a sheet containing inorganic fibers is used.
  • An object is to provide a wound gasket.
  • a spiral wound gasket including a gasket body formed by overlapping a filler material and a hoop material and winding them in a spiral shape,
  • the filler material comprises a sheet containing inorganic fibers,
  • the composition of the filler material ranges from 74 to 85% by weight of inorganic filler, 2 to 20% by weight of inorganic fiber, 2 to 20% by weight of organic fiber, and 4 to 12% by weight of organic binder (the total is 100
  • the spiral wound gasket according to [3], wherein 75% by weight or more of the inorganic fiber is rock wool.
  • the spiral wound gasket according to any one of [1] to [4], wherein the average aspect ratio of the inorganic fibers is in the range of 70 to 115.
  • the spiral wound gasket of the present invention uses a filler material having a predetermined surface roughness (Rz) to improve the familiarity between the hoop material and the filler material. As a result, permeation leakage through the interface between the filler material and the hoop material is reduced, and the sealing property at normal temperature is improved.
  • Rz surface roughness
  • the spiral wound gasket of the present invention includes an annular gasket body formed by overlapping a filler material and a hoop material and winding them in a spiral shape as shown in FIG.
  • a filler material consists of a sheet
  • the filler material used in the present invention has an Rz value according to JIS B 0031 (1994) of 26 ⁇ m or less, preferably 25 ⁇ m or less, and more preferably 24 ⁇ m or less.
  • the Rz value is preferably 1 ⁇ m or more.
  • Rz is the absolute value of the altitude of the highest peak from the highest peak to the fifth measured from the roughness line in the direction of the average line and measured in the direction of the vertical magnification from the average line of the extracted part. And the average value of the absolute values of the elevation of the bottom valley from the lowest valley bottom to the fifth, and is indicated by this value ⁇ m.
  • Rz is measured with a surface roughness measuring machine.
  • inorganic fibers other than asbestos are used, and specific examples include ceramic fibers, rock wool, glass fibers, titanate fibers, and the like.
  • rock wool is preferable in that it has biodegradability.
  • the aspect ratio of the fiber is a factor that controls the surface roughness of the filler material.
  • the aspect ratio of the inorganic fiber is large, it is considered that the unevenness of the fiber protruding from the filler surface is increased, and the surface roughness is considered to be a rough state (Rz value is increased).
  • the average value of the aspect ratio of the rock wool used in the examples was 72.48.
  • the average aspect ratio of the comparative example was 117.80. Therefore, it is possible to achieve a predetermined surface roughness by selecting and using inorganic fibers having an appropriate aspect ratio.
  • Such an inorganic fiber has an average fiber diameter of 20 ⁇ m or less, preferably 11 to 20 ⁇ m, and the average fiber length is appropriately selected from the fiber diameter and aspect ratio described above.
  • the average value of the aspect ratio is 150 or less, preferably 115 or less, and more preferably 70 to 115.
  • the shape of the inorganic fiber is obtained by measuring the fiber diameter and the fiber length by microscopic observation of 100 samples and calculating the average value and calculating the aspect ratio.
  • such inorganic fibers may be used alone or in combination of two or more.
  • rock wool is included as the inorganic fiber without adversely affecting the environment from the viewpoint of biodegradability. Furthermore, it is preferable that 75% by weight or more of the inorganic fiber is rock wool.
  • such inorganic fibers may be used alone or in combination of two or more.
  • the filler material is formed including organic fibers, inorganic fillers, inorganic binders and organic binders together with the inorganic fibers.
  • organic fibers include natural fibers such as plant fibers, synthetic fibers such as aramid fibers, carbonized fibers, carbon fibers, and graphitized fibers. These organic fibers may be used alone or in combination of two or more.
  • organic fibers play a role of increasing the strength of the filler material such that the filler material does not break when the spiral wound gasket is manufactured by winding the filler material and the hoop material.
  • Such an organic fiber is desirably flexible and does not deteriorate the airtightness of the spiral wound gasket obtained, and the fiber diameter is preferably 10 ⁇ m or less and preferably 0.2 ⁇ m or more. Therefore, as such an organic fiber, it is desirable to use at least one kind of fibrillated pulp-like aramid fiber having a fiber diameter as described above.
  • inorganic fillers examples include talc, clay, calcium carbonate, barium sulfate, zinc oxide, titanium oxide, and silica. These inorganic fillers play a role in increasing the clogging (air tightness) between fibers, the flexibility of the filler, and the shape retention (aggregation) of the filler at high temperatures, and remain without disappearing even at high temperatures. And it plays the role of maintaining the sealing performance.
  • the particle size of such an inorganic filler is preferably fine, and specifically, it is desirable to have a particle size distribution in which the particle size is 5 ⁇ m or less and the particle size of 1 ⁇ m or less is 5% or more. In the present invention, it is desirable to use two or more kinds of fillers having different particle size distributions in combination, and when two or more kinds of fillers having different particle size distributions are used in combination as described above, A gasket having excellent flexibility can be obtained.
  • the binder plays a role of combining fibers and inorganic fillers to improve sealing performance and imparting mechanical strength to the filler material.
  • Either organic or inorganic binders can be used, and organic binders and inorganic binders can be used in combination. Also good.
  • Specific examples of such an inorganic binder include polyphosphate and water glass.
  • Specific examples of organic binders include, for example, NBR-based, SBR-based, acrylic ester-based, fluorine-based rubber-based elastomer-based organic binders, methylsilicone-based binders, phenylsilicone-based binders, and other silicone-based binders.
  • a binder of phenol such as a water-dispersed phenol resin.
  • the filler material may contain a water / oil repellent such as paraffin wax as necessary.
  • a water / oil repellent such as paraffin wax
  • the sealing property at room temperature can be improved.
  • the filler material of the present invention may further contain various vulcanizing agents, vulcanization accelerators, vulcanization aids, anti-aging agents, colorants and the like.
  • the filler material used in the present invention is in the range of 74 to 85% by weight of inorganic filler, 2 to 20% by weight of inorganic fiber, 2 to 20% by weight of organic fiber, and 4 to 12% by weight of organic binder (the total is 100% by weight) %) Is preferable for exhibiting a predetermined strength.
  • the filler material used in the present invention contains the inorganic fiber and the inorganic filler as described above, and further an inorganic binder
  • the total amount of inorganic substances is 76 to 94% by weight, preferably 85 to 90% by weight (however, When an inorganic binder is included, the total of the inorganic filler, inorganic fiber, organic fiber, organic binder, and inorganic binder is 100% by weight). Included in the amount of.
  • the inorganic fiber in the filler material is contained in an amount of 2 to 20% by weight, preferably 2 to 19% by weight, particularly preferably 2 to 18% by weight, and the inorganic fiber is contained in a total amount of 100 parts by weight of the above inorganic substances. It is desirable that it is contained in an amount of 1.8 parts by weight or more, preferably 3.5 parts by weight or more.
  • the total amount of the inorganic binder and the organic binder is 5 to 20% by weight, preferably 7 to 17% by weight, and the total amount of the inorganic fiber and the organic fiber is 4 to 20% by weight, preferably Is preferably contained in an amount of 5 to 15% by weight.
  • the organic fiber is desirably contained in the filler material in an amount of 2 to 20% by weight, preferably 2.0 to 13.7% by weight, and particularly preferably 2.0 to 9.7% by weight.
  • the filler material containing the inorganic material composed of the inorganic fiber, the inorganic binder, and the inorganic filler in the total amount as described above is excellent in airtightness at high temperature. Note that the filler material having an inorganic content of less than 76% by weight contains a large amount of organic matter, so that it is decomposed at a high temperature, the weight loss becomes significant, and the effect of sizing the binder is lost.
  • the filler material containing the inorganic fiber and the organic fiber in a total amount of 4 to 20% by weight has the strength required when manufacturing the filler material and the strength required when manufacturing the spiral wound gasket. ing.
  • the spiral wound gasket having the filler material is excellent in sealing properties at room temperature, and does not impair airtightness even when used at high temperatures due to its heat loss.
  • the filler material can be produced by a conventionally known method such as a papermaking method. Moreover, it is possible to manufacture also by roll forming including the rolling process which passes the mixture containing each component, such as an inorganic fiber, several times between biaxial rolls. When roll forming. It is also possible to adjust to the desired surface roughness by increasing the compression rate of the filler material.
  • hoop material As the hoop material, a tape-shaped hoop material used for a normal spiral wound gasket can be used.
  • Examples of the material of the hoop material include stainless steel materials such as SUS304, SUS304L, SUS316, and SUS316L, and single metals and alloys such as aluminum, inconel, and hastelloy.
  • the thickness of the hoop material is usually set in the range of 0.1 to 0.3 mm, although it varies depending on conditions such as gasket dimensions, intended use, and required performance.
  • the cross-sectional shape of the hoop material is not only a curved line shape such as a V shape or M shape, but also a curved shape such as an arc shape or a wave shape, or a combination of a straight portion and a curved portion. it can.
  • the spiral wound gasket of the present invention includes a gasket body formed by winding the filler material and the hoop material in a spiral manner by a conventionally known method.
  • a filler material other than the filler material may be used in combination.
  • the gasket main body may be formed using the filler material only in the inner peripheral portion and the outer peripheral portion and using a conventional expanded graphite filler material in the central portion.
  • the spiral wound gasket of the present invention may further include an inner ring member that is fitted to the inner periphery of the gasket body and / or an outer ring member that is fitted to the outer periphery of the gasket body.
  • the spiral wound gasket of the present invention has a structure including the filler material having the surface roughness as described above, the filler material and the hoop material are closely adapted to each other, and therefore, between the filler material and the hoop material. Leakage can be suppressed. For this reason, it exhibits a high room temperature sealing property.
  • the spiral wound gasket according to the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
  • Example 1 Inorganic filler (talc, clay, etc.): 78% by weight, inorganic fiber (biodegradable rock wool, Lapinus RoxulR1000RS470): 6% by weight, organic fiber (aramid fiber): 8% by weight, organic binder (NBR): 8% by weight
  • the filler material contained in% was used.
  • the form of the filler material was a sheet, and the thickness was 0.5 ⁇ 0.05 mm.
  • the average aspect ratio of rock wool was 72.48.
  • a SUS304 thin plate having a thickness of 0.2 mm and a width of 5.3 mm, a hoop material in which the cross section is formed in a substantially V shape so as to have a predetermined gasket height (4.5 mm), and a width of 6
  • a spiral wound gasket with inner and outer rings (gasket dimensions: JIS10K25A, inner ring inner diameter: 61 mm, gasket main body: 69 mm ⁇ 89 mm, outer ring outer diameter: 104 mm) was prepared using each filler material adjusted to 0.0 mm.
  • the end portion of the hoop material is spot welded to the outer diameter side of the inner ring made of carbon steel (SPCC), and only the hoop material is wound twice, and then the filler material and the hoop material are overlapped and wound. Finally, only the hoop material is wound twice to make a predetermined gasket width of 6.5 cm, the outer end of the wound hoop material is fixed by spot welding, and an outer ring made of carbon steel (SPCC) is attached. Then, a spiral wound gasket with inner and outer rings was produced.
  • SPCC carbon steel
  • the prepared spiral wound gasket is mounted between SUS316L flanges (applicable flange standard: JIS B 2238), and compressed using a SNB7 bolt so that the gasket clamping surface pressure is 50 MPa. did.
  • Soap water foaming method After mounting a test gasket on the flange of the actual machine (gas fluid piping) and applying soapy water to the gap between the flanges, helium was circulated in the pipe, and helium was released from the pipe connection depending on the presence or absence of bubbles. Determine whether there is a leak. Soapy water foaming method is the leakage evaluation in industry, and can be observed foaming soapy water if leaks weight 3 ⁇ 10 -4 Pa ⁇ m 3 / s or more, whether there is an initial seal decisions It becomes.
  • Inorganic filler talc, clay, etc.: 78% by weight, inorganic fiber (refractive ceramic fiber): 6% by weight, organic fiber (aramid fiber): 8% by weight, organic binder (NBR): 8% by weight filler
  • the material was used.
  • the form of the filler material was a sheet, and the thickness was 0.5 ⁇ 0.05 mm.
  • the average aspect ratio of the refractory ceramic fiber was 117.80.
  • a spiral wound gasket with inner and outer rings was prepared in the same manner as in Example 1 above using the filler material of Comparative Example 1 instead of the filler material of Example 1, and sealed at room temperature by a soap water foaming method and sealed after heating. Performance was evaluated.

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Abstract

Provided is a spiral gasket which exhibits room-temperature sealing properties with few leak paths when a sheet including inorganic fibres is used. This spiral gasket is provided with a gasket main body which is formed by superposing a filler material and a hoop material and winding said materials into a spiral. The spiral gasket is characterized in that: the filler material comprises a sheet including inorganic fibres; and the Rz value of the filler material according to JIS B 0031 (1994) is not more than 26 µm. The composition of the filler material comprises 74-85 wt% of an inorganic filler material, 2-20 wt% of inorganic fibres, 2-20 wt% of organic fibres, and 4-12 wt% of an organic binder (with the caveat that the total is 100 wt%).

Description

うず巻形ガスケットSpiral wound gasket
　本発明は、うず巻形ガスケットに関し、より詳しくは、ガスケット本体のフィラー材に無機繊維を使用したうず巻形ガスケットに関する。 The present invention relates to a spiral wound gasket, and more particularly to a spiral wound gasket using inorganic fibers as a filler material of a gasket body.
　ガスケットは一般的に、ノンメタリックガスケット・セミメタルガスケット・メタルガスケットの三種が主流となっている。中でも、セミメタルガスケットは、ノンメタリックガスケットが使用できない高圧条件での使用が可能である。また、高圧条件で使用可能なガスケットとしてメタルガスケットがあるが、高い寸法精密性が要求され、硬いため締め込みにくい。このような理由から、特殊条件での使用が一般的である。一方で、セミメタルガスケットは高圧条件で使用可能であり、加工性や取り扱いが容易とされており、高圧下で使用されるガスケットとしては一般的である。特に、うず巻形ガスケットはセミメタルガスケットの中で代表的なガスケットの一つである。 Generally, there are three types of gaskets: non-metallic gaskets, semi-metal gaskets, and metal gaskets. Among these, the semimetal gasket can be used under high pressure conditions where a non-metallic gasket cannot be used. Metal gaskets can be used under high pressure conditions, but they require high dimensional accuracy and are hard to tighten. For these reasons, use under special conditions is common. On the other hand, the semi-metal gasket can be used under high pressure conditions, and is easy to process and handle, and is generally used as a gasket used under high pressure. In particular, the spiral wound gasket is one of the typical gaskets among the semimetal gaskets.
　高圧条件で使用される、うず巻形ガスケットは、フィラー材とフープ材により構成されている。 The spiral wound gasket used under high pressure conditions is composed of a filler material and a hoop material.
　うず巻形ガスケット(SWG)は、図１に示すような構成となっている。すなわち、うず巻形ガスケットにおいては、フィラー材１と、断面がＶ字等の形状の薄い金属テープからなるフープ材２とを重ね合せてうず巻状に巻いて、巻き初めと巻き終りをフープ材２のみにて２～３周の空巻きを行い、これをスポット溶接などによって固着することによって、ガスケット本体１０を形成している。 The spiral wound gasket (SWG) has a structure as shown in FIG. That is, in the spiral wound gasket, the filler material 1 and the hoop material 2 made of a thin metal tape having a V-shaped cross section are overlapped and wound in a spiral shape, and the winding start and end are wound. The gasket body 10 is formed by performing two or three rounds of idle winding with only 2 and fixing them by spot welding or the like.
　そして、このガスケット本体１０の内周縁には、ガイド部材として、環状の金属板からなる内輪リング部材３を嵌合することによって固定している。また、ガスケット本体１０の外周縁には、ガイド部材として、環状の金属板からなる外輪リング部材４を嵌合することによって固定している。 The inner ring ring member 3 made of an annular metal plate is fixed to the inner peripheral edge of the gasket body 10 as a guide member by fitting it. Further, an outer ring member 4 made of an annular metal plate is fixed to the outer peripheral edge of the gasket body 10 as a guide member by fitting.
　このようなフィラー材には、代表的に膨張黒鉛シート（たとえば、特許文献１：特開２０１１－１４４８８１号公報）、マイカを主体とするシート（たとえば、特許文献２:特開２００７－１２７１７８号公報）、無機繊維（たとえば、特許文献３：特開平７-３０５７７２号公報を配合したシートがある。 As such a filler material, typically, an expanded graphite sheet (for example, Patent Document 1: Japanese Patent Application Laid-Open No. 2011-144881) and a sheet mainly composed of mica (for example, Patent Document 2: Japanese Patent Application Laid-Open No. 2007-127178). ), Inorganic fibers (for example, Patent Document 3: JP-A-7-305772).
　内圧に対する耐性はそれぞれ類似しているが、フィラー材質が異なることで利点と問題点が以下のようにある。 耐性 Resistance to internal pressure is similar, but there are advantages and problems due to different filler materials as follows.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　マイカを主体とするシートでは、高温領域まで使用可能であるが、常温におけるシール性が悪い。また、膨張黒鉛シートでは、常温におけるシール性は良好であるが、膨張黒鉛は材質が柔らかく、傷が付やすい。このため、傷によるリークパスの形成や不良率が向上する恐れがあり、加工性や取り扱いに問題がある。 ¡Sheets mainly made of mica can be used up to a high temperature range, but the sealing performance at room temperature is poor. Further, the expanded graphite sheet has good sealing properties at room temperature, but expanded graphite is soft and easily damaged. For this reason, there is a possibility that the formation of a leak path due to scratches and the defect rate may be improved, and there is a problem in workability and handling.
　これに対し、無機繊維を配合したシートは、フィラー材として比較的、強い強度を有し、傷などがつき難く、加工性及び取り扱いに優れている。また、マイカ以上のシール性を有している利点があるものの、膨張黒鉛に匹敵する常温シール性は有していない。 In contrast, a sheet containing inorganic fibers has a relatively strong strength as a filler material, is hardly scratched, and is excellent in workability and handling. Moreover, although there exists an advantage which has the sealing performance more than mica, it does not have the normal temperature sealing performance comparable to expanded graphite.
特開２０１１－１４４８８１号公報JP 2011-144881 A 特開２００７－１２７１７８号公報JP 2007-127178 A 特開平７-３０５７７２号公報Japanese Patent Application Laid-Open No. 7-307772
　このような状況のもと、本発明は上記のような従来技術における問題点に鑑みてなされたものであり、無機繊維を配合したシートを用いたときに、リークパスの少ない常温シール性を有するうず巻形ガスケットを提供することを目的とする。 Under such circumstances, the present invention has been made in view of the above-mentioned problems in the prior art, and has a room temperature sealing property with a small leak path when a sheet containing inorganic fibers is used. An object is to provide a wound gasket.
　一般的に、うず巻形ガスケットのシール性の問題は以下の要因が考えられる。 Generally, the following factors can be considered for the problem of sealability of a spiral wound gasket.
　　(i)ガスケットとフランジ間の接面漏れ
　　(ii)フィラー材内部を通る透過漏れ
　　(iii)フィラー材とフープ材の界面を通る透過漏れ
　本発明者らは無機繊維を配合したシート材において、(ｉｉｉ）を改善することで常温シール性が向上すると考えた。そして、(iii)の漏洩メカニズムとしては、交互に積層して巻き取られているフープ材とフィラー材の接地面を流体が伝って起こると考え、これを減らすためには、フィラーの表面粗さが重要であり、目が細かい方(Rzが小さい方)が緻密に接地し、(iii)による漏れを軽減できることを見出し、本発明を完成するに至った。 (i) Contact leakage between the gasket and the flange (ii) Permeation leakage through the filler material (iii) Permeation leakage through the interface between the filler material and the hoop material In the sheet material containing the inorganic fiber, It was considered that the normal temperature sealability was improved by improving iii). And, as the leakage mechanism of (iii), it is considered that the fluid is transmitted along the ground contact surface of the hoop material and the filler material which are alternately laminated and wound, and in order to reduce this, the surface roughness of the filler It was found that the finer one (the one with smaller Rz) can be grounded closely and the leakage due to (iii) can be reduced, and the present invention has been completed.
　本発明の構成は以下の通りである。
［１］フィラー材と、フープ材とを重ね合せてうず巻状に巻いて形成したガスケット本体を備えるうず巻型ガスケットであって、
　該フィラー材が無機繊維を配合したシートからなり、
　フィラー材のJIS  B　0031（1994）によるRz値が26μｍ以下であることを特徴とするうず巻形ガスケット。
［２］フィラー材の組成が、無機充填材74～85重量％、無機繊維2～20重量％、有機繊維2～20重量％、有機バインダー4～12重量％の範囲ある（ただし、合計は１００重量％）ことを特徴とする［１］に記載のうず巻形ガスケット。
［３］無機繊維がロックウールを含むことを特徴とする［１］または［２］に記載のうず巻形ガスケット。
［４］無機繊維の75重量％以上がロックウールであることを特徴とする［３］に記載のうず巻形ガスケット。
［５］無機繊維のアスペクト比の平均値が70～115の範囲にあることを特徴とする［１］～［４］のいずれかに記載のうず巻形ガスケット。 The configuration of the present invention is as follows.
[1] A spiral wound gasket including a gasket body formed by overlapping a filler material and a hoop material and winding them in a spiral shape,
The filler material comprises a sheet containing inorganic fibers,
A spiral wound gasket characterized in that the filler material has an Rz value of 26 μm or less according to JIS B 0031 (1994).
[2] The composition of the filler material ranges from 74 to 85% by weight of inorganic filler, 2 to 20% by weight of inorganic fiber, 2 to 20% by weight of organic fiber, and 4 to 12% by weight of organic binder (the total is 100 The spiral wound gasket according to [1], wherein
[3] The spiral wound gasket according to [1] or [2], wherein the inorganic fiber includes rock wool.
[4] The spiral wound gasket according to [3], wherein 75% by weight or more of the inorganic fiber is rock wool.
[5] The spiral wound gasket according to any one of [1] to [4], wherein the average aspect ratio of the inorganic fibers is in the range of 70 to 115.
　本発明のうず巻形ガスケットは、所定の表面粗さ(Rz)を有するフィラー材を使用することで、フープ材とフィラー材との間の馴染みを良好にする。その結果、フィラー材とフープ材の界面を通る透過漏れを軽減し、常温におけるシール性が良好となる。 The spiral wound gasket of the present invention uses a filler material having a predetermined surface roughness (Rz) to improve the familiarity between the hoop material and the filler material. As a result, permeation leakage through the interface between the filler material and the hoop material is reduced, and the sealing property at normal temperature is improved.
うず巻形ガスケットの概略を示す部分断面図である。It is a fragmentary sectional view which shows the outline of a spiral wound gasket.
　以下、本発明のうず巻形ガスケットについてさらに詳細に説明する。 Hereinafter, the spiral wound gasket of the present invention will be described in more detail.
　本発明のうず巻形ガスケットは、図１に記載されるようにフィラー材と、フープ材とを重ね合せてうず巻状に巻回して形成した環状のガスケット本体を備えている。 The spiral wound gasket of the present invention includes an annular gasket body formed by overlapping a filler material and a hoop material and winding them in a spiral shape as shown in FIG.
　［フィラー材］
　フィラー材は無機繊維を配合したシートからなる。 [Filler material]
A filler material consists of a sheet | seat which mix | blended inorganic fiber.
　本発明で使用されるフィラー材は、JIS  B　0031（1994）によるRz値が２６μｍ以下であり、好ましくは２５μｍ以下であり、さらに好ましくは２４μｍ以下である。また、Rz値は１μｍ以上であることが望ましい。なお、Rｚは粗さ曲線から、その平均線の方向に基準長さを抜き取り、この抜き取り部分の平均線から縦倍率の方向に測定した、最も高い山頂から5番目までの山頂の標高の絶対値の平均値と、もっとも低い谷底から5番目までの谷底の標高の絶対値の平均値との和を求め、この値μｍで示したものである。Rｚは表面粗さ測定機で測定される。 The filler material used in the present invention has an Rz value according to JIS B 0031 (1994) of 26 μm or less, preferably 25 μm or less, and more preferably 24 μm or less. The Rz value is preferably 1 μm or more. Rz is the absolute value of the altitude of the highest peak from the highest peak to the fifth measured from the roughness line in the direction of the average line and measured in the direction of the vertical magnification from the average line of the extracted part. And the average value of the absolute values of the elevation of the bottom valley from the lowest valley bottom to the fifth, and is indicated by this value μm. Rz is measured with a surface roughness measuring machine.
　無機繊維としては、石綿以外の無機繊維が用いられ、具体的には、例えば、セラミック繊維、ロックウール、ガラス繊維、チタン酸繊維等が挙げられる。このうちロックウールが生体分解性を有する点で好ましい。 As the inorganic fibers, inorganic fibers other than asbestos are used, and specific examples include ceramic fibers, rock wool, glass fibers, titanate fibers, and the like. Among these, rock wool is preferable in that it has biodegradability.
　フィラー材の表面粗さを制御する要因としては、繊維のアスペクト比が起因すると考えられる。無機繊維のアスペクト比が大きい場合、フィラー表面に突出する繊維の凹凸が大きくなると考えられ、表面粗さとしては粗い状態 (Rz値は大きくなる)になると考えられる。本件における、実施例で使用している、ロックウールのアスペクト比の平均値は、72.48であった。また、比較例のアスペクト比の平均値は、117.80であった。そのため、適切なアスペクト比の無機繊維を選択して使用することで、所定の表面粗さを達成することが可能となる。 It is considered that the aspect ratio of the fiber is a factor that controls the surface roughness of the filler material. When the aspect ratio of the inorganic fiber is large, it is considered that the unevenness of the fiber protruding from the filler surface is increased, and the surface roughness is considered to be a rough state (Rz value is increased). In this case, the average value of the aspect ratio of the rock wool used in the examples was 72.48. The average aspect ratio of the comparative example was 117.80. Therefore, it is possible to achieve a predetermined surface roughness by selecting and using inorganic fibers having an appropriate aspect ratio.
　このような無機繊維としては、平均繊維径は２０μｍ以下、好ましくは11～20μｍであり、その平均繊維長は、前記した繊維径およびアスペクト比から適宜選定される。また、アスペクト比の平均値は150以下、好ましくは、115以下、さらに好ましくは、70～115の範囲にあることが望ましい。 Such an inorganic fiber has an average fiber diameter of 20 μm or less, preferably 11 to 20 μm, and the average fiber length is appropriately selected from the fiber diameter and aspect ratio described above. The average value of the aspect ratio is 150 or less, preferably 115 or less, and more preferably 70 to 115.
　無機繊維の形状は、１００個のサンプルについて顕微鏡観察により、実施例に示す方法により、繊維径と繊維長を測定し、平均値を求めるとともに、アスペクト比を算出する。 The shape of the inorganic fiber is obtained by measuring the fiber diameter and the fiber length by microscopic observation of 100 samples and calculating the average value and calculating the aspect ratio.
　本発明においては、このような無機繊維を、１種または２種以上組み合わせて用いてもよい。 In the present invention, such inorganic fibers may be used alone or in combination of two or more.
　本発明では、無機繊維としてロックウールを含むことが、生分解性などの観点で環境に悪影響を及ぼすことがなく好ましい。さらに、無機繊維の75重量%以上がロックウールであることが好ましい。 In the present invention, it is preferable that rock wool is included as the inorganic fiber without adversely affecting the environment from the viewpoint of biodegradability. Furthermore, it is preferable that 75% by weight or more of the inorganic fiber is rock wool.
　本発明においては、このような無機繊維を、１種または２種以上組み合わせて用いてもよい。 In the present invention, such inorganic fibers may be used alone or in combination of two or more.
　フィラー材は、前記無機繊維とともに、有機繊維、無機充填材、無機バインダおよび有機バインダを含んで形成されるものが望ましい。 It is desirable that the filler material is formed including organic fibers, inorganic fillers, inorganic binders and organic binders together with the inorganic fibers.
　有機繊維としては、植物繊維等の天然繊維、アラミド繊維等の合成繊維、炭化繊維、炭素繊維、黒鉛化繊維等が挙げられる。これらの有機繊維は、１種また２種以上組み合わせて用いてもよい。 Examples of organic fibers include natural fibers such as plant fibers, synthetic fibers such as aramid fibers, carbonized fibers, carbon fibers, and graphitized fibers. These organic fibers may be used alone or in combination of two or more.
　これら有機繊維は、フィラー材とフープ材とを巻合わせてうず巻形ガスケットを製造する際に、フィラー材が破断しないなどフィラー材の強度を強める役割を果たしている。このような有機繊維は、柔軟性に富み、得られるうず巻形ガスケットの気密性を低下させないものであることが望ましく、その繊維径は１０μｍ以下であり、0.2μｍ以上であることが望ましい。そのため、このような有機繊維として、少なくとも一種は上記のような繊維径のフィブリル化したパルプ状のアラミド繊維を使用することが望ましい。 These organic fibers play a role of increasing the strength of the filler material such that the filler material does not break when the spiral wound gasket is manufactured by winding the filler material and the hoop material. Such an organic fiber is desirably flexible and does not deteriorate the airtightness of the spiral wound gasket obtained, and the fiber diameter is preferably 10 μm or less and preferably 0.2 μm or more. Therefore, as such an organic fiber, it is desirable to use at least one kind of fibrillated pulp-like aramid fiber having a fiber diameter as described above.
　無機充填材としては、タルク、クレー、炭酸カルシウム、硫酸バリウム、酸化亜鉛、酸化チタン、シリカ等が挙げられる。これらの無機充填材は、繊維間の目づめ（気密性）、フィラーの可撓性、フィラーの高温時における形状保持性（凝集性）を高める役割を果たしており、高温時にも消失することなく残存し、シール性を維持する役割を果たしている。このような無機充填材の粒径は微細であることが好ましく、具体的には、粒径が５μｍ以下で、かつ１μｍ以下の粒子が５％以上存在する粒径分布を有することが望ましい。本発明においては、互いに異なった粒径分布をもつ２種以上の充填材を組み合わせて用いることが望ましく、このように粒径分布の異なった２種以上の充填材を組み合わせて用いると、気密性、可撓性に優れたガスケットを得ることができる。 Examples of inorganic fillers include talc, clay, calcium carbonate, barium sulfate, zinc oxide, titanium oxide, and silica. These inorganic fillers play a role in increasing the clogging (air tightness) between fibers, the flexibility of the filler, and the shape retention (aggregation) of the filler at high temperatures, and remain without disappearing even at high temperatures. And it plays the role of maintaining the sealing performance. The particle size of such an inorganic filler is preferably fine, and specifically, it is desirable to have a particle size distribution in which the particle size is 5 μm or less and the particle size of 1 μm or less is 5% or more. In the present invention, it is desirable to use two or more kinds of fillers having different particle size distributions in combination, and when two or more kinds of fillers having different particle size distributions are used in combination as described above, A gasket having excellent flexibility can be obtained.
　バインダは、繊維と無機充填材とを結合し、シール性を高めフィラー材に機械的強度を与える役割を果たしており、有機・無機のいずれでもよく、また有機バインダと無機バインダとを組合せて用いてもよい。このような無機バインダとして、具体的には、例えば、ポリリン酸塩、水ガラス等を挙げることができる。有機バインダとしては、具体的には、例えば、ＮＢＲ系、ＳＢＲ系、アクリル酸エステル系、フッ素ゴム系等の耐熱性に富むエラストマー系有機バインダ、メチルシリコーン系バインダ、フェニルシリコーン系バインダ等のシリコーン系のバインダ、あるいは水分散系フェノール樹脂等のフェノール系のバインダが挙げられる。 The binder plays a role of combining fibers and inorganic fillers to improve sealing performance and imparting mechanical strength to the filler material. Either organic or inorganic binders can be used, and organic binders and inorganic binders can be used in combination. Also good. Specific examples of such an inorganic binder include polyphosphate and water glass. Specific examples of organic binders include, for example, NBR-based, SBR-based, acrylic ester-based, fluorine-based rubber-based elastomer-based organic binders, methylsilicone-based binders, phenylsilicone-based binders, and other silicone-based binders. Or a binder of phenol such as a water-dispersed phenol resin.
　フィラー材には、上述したような成分に加え、必要に応じて、パラフィンワックス系等の撥水・撥油剤が含まれていてもよい。このような撥水・撥油剤を用いると、常温時のシール性を向上させることができる。 In addition to the above-described components, the filler material may contain a water / oil repellent such as paraffin wax as necessary. When such a water / oil repellent is used, the sealing property at room temperature can be improved.
　また本発明のフィラー材には、上記成分に加えてさらに、各種加硫剤、加硫促進剤、加硫助剤、老化防止剤、着色剤等が含まれていてもよい。 Further, in addition to the above components, the filler material of the present invention may further contain various vulcanizing agents, vulcanization accelerators, vulcanization aids, anti-aging agents, colorants and the like.
　本発明で使用するフィラー材は、無機充填材７４～８５重量％、無機繊維２～２０重量％、有機繊維２～２０重量％、有機バインダ４～１２重量の範囲ある（ただし、合計は１００重量％）ものが所定の強度を発現するために好ましい。 The filler material used in the present invention is in the range of 74 to 85% by weight of inorganic filler, 2 to 20% by weight of inorganic fiber, 2 to 20% by weight of organic fiber, and 4 to 12% by weight of organic binder (the total is 100% by weight) %) Is preferable for exhibiting a predetermined strength.
　本発明で使用するフィラー材には、上記のような無機繊維と無機充填材と、さらに無機バインダとを含む場合、無機物は合計で７６～９４重量％、好ましくは８５～９０重量％（ただし、無機バインダを含む場合、無機充填材、無機繊維、有機繊維、有機バインダおよび無機バインダの合計は１００重量％）で含まれる。
の量で含まれる。 When the filler material used in the present invention contains the inorganic fiber and the inorganic filler as described above, and further an inorganic binder, the total amount of inorganic substances is 76 to 94% by weight, preferably 85 to 90% by weight (however, When an inorganic binder is included, the total of the inorganic filler, inorganic fiber, organic fiber, organic binder, and inorganic binder is 100% by weight).
Included in the amount of.
　フィラー材中の無機繊維は２～２０重量％、好ましくは２～１９重量％、特に好ましくは２～１８重量％の量で含まれ、しかも、無機繊維は上記の無機物の総量１００重量部中に１.８重量部以上、好ましくは３.５重量部以上の量で含まれていることが望ましい。 The inorganic fiber in the filler material is contained in an amount of 2 to 20% by weight, preferably 2 to 19% by weight, particularly preferably 2 to 18% by weight, and the inorganic fiber is contained in a total amount of 100 parts by weight of the above inorganic substances. It is desirable that it is contained in an amount of 1.8 parts by weight or more, preferably 3.5 parts by weight or more.
　また、フィラー材中に、無機バインダと有機バインダとは合計で、５～２０重量％、好ましくは７～１７重量％の量で、無機繊維と有機繊維とは合計で４～２０重量％、好ましくは５～１５重量％の量で含まれていることが望ましい。 In the filler material, the total amount of the inorganic binder and the organic binder is 5 to 20% by weight, preferably 7 to 17% by weight, and the total amount of the inorganic fiber and the organic fiber is 4 to 20% by weight, preferably Is preferably contained in an amount of 5 to 15% by weight.
　また、有機繊維は２～２０重量％、好ましくは２．０～１３．７重量％、特に好ましくは２.０～９．７重量％の量でフィラー材中に含まれていることが望ましい。 The organic fiber is desirably contained in the filler material in an amount of 2 to 20% by weight, preferably 2.0 to 13.7% by weight, and particularly preferably 2.0 to 9.7% by weight.
　この無機繊維と無機バインダと無機充填材とからなる無機物が上記のような総量で含まれたフィラー材は、高温下での気密性に優れている。なお、無機物含有量が７６重量％より少ないフィラー材では、有機物が多いので、高温下で分解され、減量が著しくなり、バインダの目づめ効果がなくなる。 The filler material containing the inorganic material composed of the inorganic fiber, the inorganic binder, and the inorganic filler in the total amount as described above is excellent in airtightness at high temperature. Note that the filler material having an inorganic content of less than 76% by weight contains a large amount of organic matter, so that it is decomposed at a high temperature, the weight loss becomes significant, and the effect of sizing the binder is lost.
　また、上記のように無機繊維と有機繊維とが合計で４～２０重量％の量で含まれたフィラー材は、フィラー材製造時に必要な強度およびうず巻形ガスケット製造時に必要な強度を有している。しかもこのフィラー材を有するうず巻形ガスケットでは、常温時のシール性にも優れ、高温下に使用してもその熱減量により、気密性を損なうものではない。 Further, as described above, the filler material containing the inorganic fiber and the organic fiber in a total amount of 4 to 20% by weight has the strength required when manufacturing the filler material and the strength required when manufacturing the spiral wound gasket. ing. Moreover, the spiral wound gasket having the filler material is excellent in sealing properties at room temperature, and does not impair airtightness even when used at high temperatures due to its heat loss.
　フィラー材は、抄紙法など従来公知の方法にて製造することができ。また、無機繊維などの各成分を含む混合物を、２軸ロール間に複数回通す圧延工程を含むロール成形によっても製造することは可能である。ロール成形の際に。フィラー材の圧縮率を高めることで、所望の表面粗さに調整することも可能である。 The filler material can be produced by a conventionally known method such as a papermaking method. Moreover, it is possible to manufacture also by roll forming including the rolling process which passes the mixture containing each component, such as an inorganic fiber, several times between biaxial rolls. When roll forming. It is also possible to adjust to the desired surface roughness by increasing the compression rate of the filler material.
 [フープ材]
　前記フープ材としては、通常のうず巻形ガスケットに用いられるテープ状のフープ材を使用することができる。 [Hoop material]
As the hoop material, a tape-shaped hoop material used for a normal spiral wound gasket can be used.
　フープ材の材料としては、ＳＵＳ３０４、ＳＵＳ３０４Ｌ、ＳＵＳ３１６、ＳＵＳ３１６Ｌなどのステンレス鋼材や、アルミニウム、インコネル、ハステロイ等の単体金属および合金などが挙げられる。 Examples of the material of the hoop material include stainless steel materials such as SUS304, SUS304L, SUS316, and SUS316L, and single metals and alloys such as aluminum, inconel, and hastelloy.
　前記フープ材の厚みは、ガスケットの寸法や使用用途、要求性能などの条件によっても異なるが、通常は、０．１～０．３ｍｍの範囲に設定される。 The thickness of the hoop material is usually set in the range of 0.1 to 0.3 mm, although it varies depending on conditions such as gasket dimensions, intended use, and required performance.
　前記フープ材の断面形状は、Ｖ字形やＭ字形などの屈曲線状をなすもののほか、円弧状や波形状などの曲線状のもの、直線部分と曲線部分とが組み合わされているものなども採用できる。
［うず巻形ガスケット］
　本発明のうず巻形ガスケットは、前記フィラー材と前記フープ材とを従来公知の方法でうず巻状に巻いて形成したガスケット本体を備えている。 The cross-sectional shape of the hoop material is not only a curved line shape such as a V shape or M shape, but also a curved shape such as an arc shape or a wave shape, or a combination of a straight portion and a curved portion. it can.
[Spiral wound gasket]
The spiral wound gasket of the present invention includes a gasket body formed by winding the filler material and the hoop material in a spiral manner by a conventionally known method.
　また前記ガスケット本体においては、前記フィラー材以外のフィラー材が併用されていてもよい。たとえば、内周部および外周部のみに前記フィラー材を使用し、中央部には従来の膨張黒鉛フィラー材を使用してガスケット本体が形成されていてもよい。 In the gasket body, a filler material other than the filler material may be used in combination. For example, the gasket main body may be formed using the filler material only in the inner peripheral portion and the outer peripheral portion and using a conventional expanded graphite filler material in the central portion.
　本発明のうず巻型ガスケットは、さらに前記ガスケット本体の内周に嵌合される内輪リング部材および／または前記ガスケット本体の外周に嵌合される外輪リング部材を備えていてもよい。 The spiral wound gasket of the present invention may further include an inner ring member that is fitted to the inner periphery of the gasket body and / or an outer ring member that is fitted to the outer periphery of the gasket body.
　本発明のうず巻形ガスケットは、上記のような表面粗さを具備したフィラー材を含む構造であることから、フィラー材とフープ材とが密接になじむので、フィラー材とフープ材との間からの、漏れを抑制できる。このため高い常温シール性を発揮する。
［実施例］
　以下、本発明に係るうず巻形ガスケットを実施例によりさらに詳細に説明するが、本発明はこれらの実施例により何ら限定されるものではない。
＜繊維径、繊維長の評価＞
　無機繊維の電子顕微鏡写真を撮影し、径および長さを測定した。
［実施例１］
　無機充填材(タルク・クレー他)：78重量%、無機繊維(生分解性ロックウール、ラピナスRoxulR1000RS470)：6重量%、有機繊維 (アラミド繊維)：8重量%、有機バインダ(NBR)：8重量%で含むフィラー材を使用した。フィラー材の形態はシート状であり、その厚みは、0.5±0.05 mmであった。ロックウールのアスペクト比の平均値は、72.48であった。 Since the spiral wound gasket of the present invention has a structure including the filler material having the surface roughness as described above, the filler material and the hoop material are closely adapted to each other, and therefore, between the filler material and the hoop material. Leakage can be suppressed. For this reason, it exhibits a high room temperature sealing property.
[Example]
Hereinafter, the spiral wound gasket according to the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
<Evaluation of fiber diameter and fiber length>
Electron micrographs of the inorganic fibers were taken and the diameter and length were measured.
[Example 1]
Inorganic filler (talc, clay, etc.): 78% by weight, inorganic fiber (biodegradable rock wool, Lapinus RoxulR1000RS470): 6% by weight, organic fiber (aramid fiber): 8% by weight, organic binder (NBR): 8% by weight The filler material contained in% was used. The form of the filler material was a sheet, and the thickness was 0.5 ± 0.05 mm. The average aspect ratio of rock wool was 72.48.
　以下の方法で、フィラー材の表面粗さを評価した。
＜評価方法＞
　JIS B 0031(1994)に準ずる形で測定を行った。測定は、作製した3個の試験片について行った。
評価長さ：4.0 ｍｍ
評価速度：0.3 ｍｍ/s
カットオフ値：0.8 ｍｍ
　その結果、Rz=19.835μｍ、20.335μｍ、21.538μｍであった。 The surface roughness of the filler material was evaluated by the following method.
<Evaluation method>
Measurements were performed in accordance with JIS B 0031 (1994). The measurement was performed on the three prepared test pieces.
Evaluation length: 4.0 mm
Evaluation speed: 0.3 mm / s
Cut-off value: 0.8 mm
As a result, Rz = 19.835 μm, 20.335 μm, and 21.538 μm.
　次に、厚さ０．２ｍｍ、幅５．３ｍｍのＳＵＳ３０４製の薄板を、所定のガスケット高さ（４．５ｍｍ）となるように断面を略Ｖ字状に成形したフープ材と、幅を６．０ｍｍに調整した前記各フィラー材とを用いて、内外輪付うず巻形ガスケット（ガスケット寸法：ＪＩＳ１０Ｋ２５Ａ、内輪内径；61ｍｍ、ガスケット本体；69ｍｍ×89ｍｍ、外輪外径；104ｍｍ）を作製した。 Next, a SUS304 thin plate having a thickness of 0.2 mm and a width of 5.3 mm, a hoop material in which the cross section is formed in a substantially V shape so as to have a predetermined gasket height (4.5 mm), and a width of 6 A spiral wound gasket with inner and outer rings (gasket dimensions: JIS10K25A, inner ring inner diameter: 61 mm, gasket main body: 69 mm × 89 mm, outer ring outer diameter: 104 mm) was prepared using each filler material adjusted to 0.0 mm.
　具体的には、炭素鋼（ＳＰＣＣ）製の内輪の外径側にフープ材の端部をスポット溶接し、フープ材のみ２周巻きつけた後、フィラー材とフープ材とを重ねて巻きつけ、最後にフープ材のみを２周巻きつけて、所定のガスケット幅６．５ｃｍとし、巻きつけたフープ材の外形側の端部はスポット溶接により固定し、さらに炭素鋼（ＳＰＣＣ）製の外輪を装着し、内外輪付うず巻形ガスケットを作製した。 Specifically, the end portion of the hoop material is spot welded to the outer diameter side of the inner ring made of carbon steel (SPCC), and only the hoop material is wound twice, and then the filler material and the hoop material are overlapped and wound. Finally, only the hoop material is wound twice to make a predetermined gasket width of 6.5 cm, the outer end of the wound hoop material is fixed by spot welding, and an outer ring made of carbon steel (SPCC) is attached. Then, a spiral wound gasket with inner and outer rings was produced.
　作製したうず巻形ガスケットをＳＵＳ３１６Ｌ製のフランジ（適用フランジ規格：ＪＩＳ Ｂ ２２３８）間に装着し、ＳＮＢ７製のボルトを用いて、ガスケット締め付け面圧が５０ＭＰａとなるように圧縮させて供試体を作成した。 The prepared spiral wound gasket is mounted between SUS316L flanges (applicable flange standard: JIS B 2238), and compressed using a SNB7 bolt so that the gasket clamping surface pressure is 50 MPa. did.
　次いで、この供試体のシール性能を石鹸水発泡法により常温シール性を評価した。
＜石鹸水発泡法＞
　実機（ガス性流体用配管）フランジ部に試験用ガスケットを組付け、フランジ間隙に石鹸水を塗布したのち、ヘリウムを配管内に流通させて、気泡発生の有無により、配管の接続部からヘリウムが漏洩しているか否かを判断する。石鹸水発泡法は、工業界における漏洩評価であり、漏洩量3×10-4 Pa・m3/s以上であれば石鹸水の発泡を観測可能であり、初期シールがあるかどうかの判断材料となる。
［比較例１］
　無機充填材(タルク・クレー他)：78重量%、無機繊維(リフラクトリーセラミックファイバー)：6重量%、有機繊維 (アラミド繊維)：8重量%、有機バインダ(NBR)：8重量%で含むフィラー材を使用した。フィラー材の形態はシート状であり、その厚みは、0.5±0.05 mmであった。リフラクトリーセラミックファイバーの平均アスペクト比は、117.80であった。 Next, the sealing performance of this specimen was evaluated for normal temperature sealing property by a soap water foaming method.
<Soap water foaming method>
After mounting a test gasket on the flange of the actual machine (gas fluid piping) and applying soapy water to the gap between the flanges, helium was circulated in the pipe, and helium was released from the pipe connection depending on the presence or absence of bubbles. Determine whether there is a leak. Soapy water foaming method is the leakage evaluation in industry, and can be observed foaming soapy water if leaks weight 3 × 10 -4 Pa · m 3 / s or more, whether there is an initial seal decisions It becomes.
[Comparative Example 1]
Inorganic filler (talc, clay, etc.): 78% by weight, inorganic fiber (refractive ceramic fiber): 6% by weight, organic fiber (aramid fiber): 8% by weight, organic binder (NBR): 8% by weight filler The material was used. The form of the filler material was a sheet, and the thickness was 0.5 ± 0.05 mm. The average aspect ratio of the refractory ceramic fiber was 117.80.
　実施例１と同様の方法で、３個のフィラー材の表面粗さを評価した。その結果、Rz=34.806μｍ、34.654μｍ、27.943μｍであった。 The surface roughness of the three filler materials was evaluated in the same manner as in Example 1. As a result, Rz = 34.806 μm, 34.654 μm, and 27.943 μm.
　実施例１のフィラー材に替えて比較例１のフィラー材を使用して上記実施例１と同様にして内外輪付うず巻形ガスケットを作成し、石鹸水発泡法により常温シール性および加熱後シール性能を評価した。 A spiral wound gasket with inner and outer rings was prepared in the same manner as in Example 1 above using the filler material of Comparative Example 1 instead of the filler material of Example 1, and sealed at room temperature by a soap water foaming method and sealed after heating. Performance was evaluated.
　結果をあわせて表２に示す。 The results are shown in Table 2.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
１・・・フィラー材
２・・・フープ材
３・・・内輪リング部材
４・・・外輪リング部材
１０・・・ガスケット本体 DESCRIPTION OF SYMBOLS 1 ... Filler material 2 ... Hoop material 3 ... Inner ring ring member 4 ... Outer ring ring member 10 ... Gasket body

Claims (5)

  1. 　フィラー材と、フープ材とを重ね合せてうず巻状に巻いて形成したガスケット本体を備えるうず巻型ガスケットであって、
    　該フィラー材が無機繊維を配合したシートからなり、
    　フィラー材のJIS  B　0031（1994）によるRz値が26μｍ以下であることを特徴とするうず巻形ガスケット。     A spiral wound gasket comprising a gasket body formed by overlapping a filler material and a hoop material and winding them in a spiral shape,
    The filler material comprises a sheet containing inorganic fibers,
    A spiral wound gasket characterized in that the filler material has an Rz value of 26 μm or less according to JIS B 0031 (1994).
  2. 　フィラー材の組成が、無機充填材74～85重量％、無機繊維2～20重量％、有機繊維2～20重量％、有機バインダー4～12重量％の範囲ある（ただし、合計は１００重量％）ことを特徴とする請求項１に記載のうず巻形ガスケット。 The composition of the filler material ranges from 74 to 85% by weight of inorganic filler, 2 to 20% by weight of inorganic fiber, 2 to 20% by weight of organic fiber, and 4 to 12% by weight of organic binder (the total is 100% by weight) The spiral wound gasket according to claim 1.
  3. 　無機繊維がロックウールを含むことを特徴とする請求項１または２に記載のうず巻形ガスケット。 The spiral wound gasket according to claim 1 or 2, wherein the inorganic fiber includes rock wool.
  4. 　無機繊維の75重量％以上がロックウールであることを特徴とする請求項３に記載のうず巻形ガスケット。 The spiral wound gasket according to claim 3, wherein 75% by weight or more of the inorganic fiber is rock wool.
  5. 　無機繊維のアスペクト比の平均値が70～115の範囲にあることを特徴とする請求項１～４のいずれかに記載のうず巻形ガスケット。 The spiral wound gasket according to any one of claims 1 to 4, wherein the average aspect ratio of the inorganic fibers is in the range of 70 to 115.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020143747A (en) * 2019-03-07 2020-09-10 株式会社Ｉｈｉ回転機械エンジニアリング Gasket and fluid device

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JPH0781131B2 (en) * 1991-04-11 1995-08-30 日本ピラー工業株式会社 Spiral gasket filler material
JPH07305772A (en) * 1994-05-11 1995-11-21 Nippon Valqua Ind Ltd Nonasbestine filler material for spiral gasket
JP2007127178A (en) * 2005-11-02 2007-05-24 Nippon Valqua Ind Ltd Spiral type gasket
JP2007182950A (en) * 2006-01-10 2007-07-19 Nippon Pillar Packing Co Ltd Spiral gasket
JP2011144881A (en) * 2010-01-15 2011-07-28 Nichias Corp Spiral gasket
JP2013117285A (en) * 2011-12-05 2013-06-13 Nichias Corp Winding gasket and method of manufacturing the same
JP2013199983A (en) * 2012-03-24 2013-10-03 Nippon Valqua Ind Ltd Fluororesin gasket for pipe sealing
WO2014007364A1 (en) * 2012-07-06 2014-01-09 株式会社 東芝 Spiral gasket

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0781131B2 (en) * 1991-04-11 1995-08-30 日本ピラー工業株式会社 Spiral gasket filler material
JPH07305772A (en) * 1994-05-11 1995-11-21 Nippon Valqua Ind Ltd Nonasbestine filler material for spiral gasket
JP2007127178A (en) * 2005-11-02 2007-05-24 Nippon Valqua Ind Ltd Spiral type gasket
JP2007182950A (en) * 2006-01-10 2007-07-19 Nippon Pillar Packing Co Ltd Spiral gasket
JP2011144881A (en) * 2010-01-15 2011-07-28 Nichias Corp Spiral gasket
JP2013117285A (en) * 2011-12-05 2013-06-13 Nichias Corp Winding gasket and method of manufacturing the same
JP2013199983A (en) * 2012-03-24 2013-10-03 Nippon Valqua Ind Ltd Fluororesin gasket for pipe sealing
WO2014007364A1 (en) * 2012-07-06 2014-01-09 株式会社 東芝 Spiral gasket

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020143747A (en) * 2019-03-07 2020-09-10 株式会社Ｉｈｉ回転機械エンジニアリング Gasket and fluid device
JP7267782B2 (en) 2019-03-07 2023-05-02 株式会社Ｉｈｉ回転機械エンジニアリング Gasket and fluid system

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