JP2000167927A - Manufacture of rubber product including reinforcing cloth - Google Patents
Manufacture of rubber product including reinforcing clothInfo
- Publication number
- JP2000167927A JP2000167927A JP34430498A JP34430498A JP2000167927A JP 2000167927 A JP2000167927 A JP 2000167927A JP 34430498 A JP34430498 A JP 34430498A JP 34430498 A JP34430498 A JP 34430498A JP 2000167927 A JP2000167927 A JP 2000167927A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- sheet
- reinforcing cloth
- vulcanized
- mold
- 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
Links
Landscapes
- Laminated Bodies (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ダイヤフラム、ベ
ローなどのゴム製品の製造方法に関し、これらは使用
時、圧力が負荷される場合、ゴムだけでは弾性率が低
く、特に薄い厚みの製品は、大きく膨張し破裂するの
で、補強布をゴムに挿入し、膨張を防いでいる。本発明
は補強布入りゴムシートで自由に所望の形状に成形する
新規な製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a rubber product such as a diaphragm or a bellows. As it swells and ruptures, a reinforcing cloth is inserted into the rubber to prevent swelling. The present invention relates to a novel manufacturing method for freely forming a desired shape from a rubber sheet containing a reinforcing cloth.
【０００２】[0002]
【従来の技術】凹凸のある補強布入りゴム製品を金型に
て、加硫製造する場合、未加硫ゴムシートの間に補強布
をサンドイッチにし、低温の金型に充填し加圧し所定の
形状に近い形状に予備成型し、不要なゴムを取り除いた
後、高温の金型に充填し加圧加硫したり、製品に必要な
重量を予め計算し、製品形状に見合った寸法にシートを
裁断し、金型に充填し、加圧、加温し加硫する方法によ
っている。しかしながら、このような方法によると、充
填ゴムシートの厚みのバラつきや、金型精度のバラつ
き、あるいは加圧力の不均衡等により、加硫時、ゴムの
流動で補強布も動き、布の粗密ができたり、布が表面近
くに出てくることが多く、不良の発生率が高く、ゴムの
みの製品に比べ、コスト高の大きな要因となっている。2. Description of the Related Art When vulcanizing and manufacturing a rubber product containing an uneven reinforcing cloth in a mold, the reinforcing cloth is sandwiched between unvulcanized rubber sheets, filled in a low-temperature mold and pressed to a predetermined pressure. After preforming into a shape close to the shape, removing unnecessary rubber, filling in a high-temperature mold and vulcanizing under pressure, calculating the weight required for the product in advance, and forming a sheet to the dimensions suitable for the product shape Cutting, filling in a mold, pressurizing, heating and vulcanizing. However, according to such a method, the reinforcing cloth moves due to the flow of the rubber at the time of vulcanization due to the unevenness of the thickness of the filled rubber sheet, the unevenness of the mold accuracy, or the imbalance of the pressing force. In many cases, fabrics come out near the surface, and the occurrence rate of defects is high, which is a major factor in higher costs as compared with rubber-only products.
【０００３】[0003]
【発明が解決しようとする課題】補強布が入ったゴム製
品を加硫成型するには、補強布をサンドイッチした未加
硫ゴムシートを金型に充填し、加圧、加温し成型する
が、その際、凹凸の激しい形状の場合、ゴムの流れによ
り布が乱れたり、布が表面に出たりし、製品の見栄えが
悪い上、使用時の寿命に大きく影響する。これを防ぐに
は、精密な金型と正確なゴムの予備成型が必要である
が、しかし、ゴムの加硫には本質的に金型のキャビテイ
の容量よりゴムの容量を大きくする必要があるため、ゴ
ムの流動は避けられず、布をゴム厚の中心に維持するの
は、難しい技術である。特に厚みが薄い製品ほど、ゴム
中に補強布を挿入加硫し、表面に布が出ないように成型
するのは非常に困難である。本発明はこのような課題を
解決するためになされたものである。In order to vulcanize and mold a rubber product containing a reinforcing cloth, an unvulcanized rubber sheet sandwiched with the reinforcing cloth is filled in a mold, and then pressurized, heated and molded. At this time, in the case of a shape having severe irregularities, the cloth may be disturbed by the flow of rubber, or the cloth may come out on the surface, so that the appearance of the product is poor and the life in use is greatly affected. Preventing this requires precise molds and precise rubber pre-molding, but rubber vulcanization essentially requires a larger rubber volume than the mold cavity volume Therefore, the flow of rubber is inevitable, and maintaining the cloth at the center of the rubber thickness is a difficult technique. In particular, it is very difficult to insert a vulcanizing cloth into rubber and vulcanize the product so that the cloth does not come out on the surface as the product becomes thinner. The present invention has been made to solve such a problem.
【０００４】[0004]
【課題を解決するための手段】本発明の要旨は、補強布
の両面に加硫後は形状記憶性を持つ未加硫ゴムを加硫接
着させた補強布入り平ゴム加硫シートを作製した後、形
状記憶ゴムの変態温度以上に平シートを加熱し、所定形
状に加圧、変形させたまま変態温度以下に冷却した後、
脱型することを特徴とする補強布入りゴム製品の製造方
法でる。The gist of the present invention is that a flat rubber vulcanized sheet containing a reinforcing cloth is formed by vulcanizing and adhering unvulcanized rubber having shape memory after vulcanization to both sides of the reinforcing cloth. After heating the flat sheet above the transformation temperature of the shape memory rubber, pressurizing it to a predetermined shape, cooling it to below the transformation temperature while deforming,
A method for producing a rubber product containing a reinforcing cloth, which is characterized in that it is released from the mold.
【０００５】ここで、補強布入り平ゴム加硫シートの加
圧、変形は、上下金型あるいは一枚の金型ですむ真空・
圧空成形型で行なうのである。[0005] Here, the pressure and deformation of the flat rubber vulcanized sheet containing the reinforcing cloth can be performed by a vacuum or a vacuum die or a single die.
This is done with a compressed air mold.
【０００６】このように、補強布の上下面に、ゴムを加
硫接着した加硫ゴムシートを予め製造し、所定の形状に
変形できれば、補強布に乱れは少なく布が表面に出るこ
ともない。一般のゴムで上記のことを行えば、変形させ
てもすぐ、元のシートの形状に戻ってしまう。しかし、
本発明の成形方法ではゴムとして形状記憶性のゴムで、
その変態温度が製品の使用温度より高い場合、シートを
変形させ変態温度以下に冷却すれば、その形状を保持す
ることができ、補強布が表面に出ることもなく、ゴム厚
の中心に維持することも可能である。As described above, a vulcanized rubber sheet in which rubber is vulcanized and bonded to the upper and lower surfaces of the reinforcing cloth is prepared in advance, and if the vulcanized rubber sheet can be deformed into a predetermined shape, the reinforcing cloth is less disturbed and the cloth does not come out on the surface. . If the above is done with general rubber, even if it is deformed, it will immediately return to the original sheet shape. But,
In the molding method of the present invention, a rubber having shape memory as the rubber,
If the transformation temperature is higher than the use temperature of the product, if the sheet is deformed and cooled to below the transformation temperature, its shape can be maintained, the reinforcing cloth does not come out on the surface and it is maintained at the center of the rubber thickness It is also possible.
【０００７】加硫シートは未加硫シートとちがって成形
時にゴムの移動が少なくゴム層が薄くても補強布の移動
が少なく、表面に露出し難い。上下金型でなく、ゴム層
の偏りが著しい真空、圧空成形でも、十分な均一性が得
られる。[0007] Unlike an unvulcanized sheet, a vulcanized sheet has a small amount of rubber movement during molding and has a small amount of movement of the reinforcing cloth even if the rubber layer is thin, and is hardly exposed to the surface. Sufficient uniformity can be obtained not only in the upper and lower molds, but also in vacuum or air pressure molding in which the rubber layer is significantly deflected.
【０００８】形状記憶性ゴム組成物は、常温でゴム弾性
を有したゴム成形体に熱的変化に対して生じる収縮と
か、他の形状への変形を利用するのに種々開発されてお
り、例えば、ガラス転移温度(Ｔｇ)が10℃以上で分子量
が100万以上のノルボルネン系ポリマー(特開昭59-53528
号)とか、ガラス転移温度が室温以上の硬質樹脂状合成
付加重合体(特開昭60-28433号)がある。また、Ｔｇが−
10℃以下のものでは、結晶化度20％以上のクロロプレン
ゴムを主原料とした結晶性ポリマー架橋体(特公平６-96
642号)などが知られている。そのほか、形状記憶性ポリ
マーとして、ポリノルボルネン系、スチレン−ブタジエ
ン系、ポリイソプレン系、ポリウレタン系、ポリエステ
ル系、ポリオレフィン系、アクリル系、スチレン−アク
リル系、含フッ素系の各種ポリマー、合成ゴム系など広
範囲に形状記憶性を付与した組成物が提案されている。Various shape memory rubber compositions have been developed to utilize the shrinkage caused by a thermal change in a rubber molded article having rubber elasticity at room temperature or the deformation to another shape. A norbornene-based polymer having a glass transition temperature (Tg) of 10 ° C. or more and a molecular weight of 1,000,000 or more (JP-A-59-53528).
Or a hard resinous synthetic addition polymer having a glass transition temperature of room temperature or higher (JP-A-60-28433). Also, Tg is-
When the temperature is 10 ° C or lower, a crystalline polymer crosslinked product containing chloroprene rubber having a crystallinity of 20% or more as a main raw material (Japanese Patent Publication No. 6-96)
No. 642) is known. In addition, a wide range of shape memory polymers such as polynorbornene, styrene-butadiene, polyisoprene, polyurethane, polyester, polyolefin, acrylic, styrene-acryl, and fluorine-containing polymers, and synthetic rubber There is proposed a composition having a shape memory property.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態につき
説明する。ナイロン織布(正織)に接着処理を施し、加硫
後には形状記憶性を持つ２枚の未加硫ゴムシート間に、
上記織布をサンドイッチにし、プレスにて高温、高圧を
かけ、布とゴムを加硫接着させて加硫平シートを製造す
れば、ゴム厚のほぼ中央に布が挿入された加硫平シート
が得られる。この平シートを形状に見合った適当な寸法
に裁断し、所定の形状が得られる金型に充填し、加硫ゴ
ムの変態温度以上に加熱し、圧力をかけ、所定の形状に
変形させ、冷却後取り出せば、製品としての所定の形状
を保持した布入りゴムが得られる。この布入りゴムを再
度、変態温度以上に加熱すれば、平シートに戻ってしま
うので、製品の使用温度は、変態温度以下の必要があ
る。具体的な形状については以下の実施例で説明する。Embodiments of the present invention will be described below. Nylon woven fabric (regular weave) is subjected to adhesive treatment, after vulcanization, between two unvulcanized rubber sheets with shape memory,
If the above woven fabric is made into a sandwich, high temperature and high pressure are applied with a press, and the cloth and rubber are vulcanized and bonded to produce a vulcanized flat sheet, the vulcanized flat sheet with the cloth inserted almost at the center of the rubber thickness is obtained. can get. This flat sheet is cut into an appropriate size corresponding to the shape, filled into a mold capable of obtaining a predetermined shape, heated above the transformation temperature of the vulcanized rubber, pressurized, deformed into a predetermined shape, and cooled. If taken out later, a cloth-containing rubber that has a predetermined shape as a product can be obtained. If the cloth-containing rubber is heated again to a temperature higher than the transformation temperature, it returns to a flat sheet. Therefore, the use temperature of the product must be lower than the transformation temperature. Specific shapes will be described in the following embodiments.
【００１０】ここで用いる形状記憶ゴムは、一般に知ら
れているエチレンプロピレンポリマー(ＥＰＴ)、フッ素
ゴム、シリコンゴム、ニトリルブタジエンゴム(ＮＢ
Ｒ)、イソプレンゴム、ノルボルネンゴムなどが利用で
きる。製品の使用温度を考慮してこれらのゴムの変態温
度により選択する。代表的な形状記憶ゴムとその変態温
度は表１のとおりである。The shape memory rubber used here is generally known ethylene propylene polymer (EPT), fluoro rubber, silicon rubber, nitrile butadiene rubber (NB)
R), isoprene rubber, norbornene rubber and the like can be used. It is selected according to the transformation temperature of these rubbers in consideration of the service temperature of the product. Table 1 shows typical shape memory rubbers and their transformation temperatures.
【００１１】[0011]
【表１】 [Table 1]
【００１２】実施例１ 形状記憶性ゴムにＥＰＴを用い、図１の断面形状に示す
ように、外径300φで、山の高さ25mm、厚み３ｔ(３mm)
の形状記憶ゴム層１で、糸の太さ840デニールのナイロ
ン正織の織布からなる補強布２が、ゴム組成ゴム厚の中
央に挿入接着されたドーナツ状のダイヤフラム３を製造
した。加硫ゴムでは、変態温度約170℃を持ち、ゴム硬
度Ｈｓ70、厚み３ｔの厚み中央に、ナイロン織布を加硫
接着した平シートを作り、そのシートを外径340φ、内
径80φの穴を持つ形状に裁断し、上型、下型で図１の形
状になる金型を170℃に加熱しておき、上記裁断シート
を金型に入れ、加圧した後、金型を加圧したまま冷却
し、室温にて取り出し、図１のようなダイヤフラム３の
製品を得た。また、室温の金型に上記３ｔのシートを予
め、180℃程度に加熱しておき、すばやく金型に入れ、
加圧しても同様な製品が得られた。Example 1 EPT was used as the shape memory rubber, and as shown in the cross-sectional shape of FIG. 1, the outer diameter was 300φ, the peak height was 25 mm, and the thickness was 3 t (3 mm).
A doughnut-shaped diaphragm 3 in which a reinforcing cloth 2 made of a regular woven nylon fabric having a thread thickness of 840 denier was inserted and adhered to the center of the rubber composition rubber thickness in the shape memory rubber layer 1 of the above (1). For vulcanized rubber, it has a transformation temperature of about 170 ° C, a flat sheet made by vulcanizing and bonding a nylon woven fabric at the center of thickness 3t with a rubber hardness of Hs70 and a hole with an outer diameter of 340φ and an inner diameter of 80φ. The mold is cut into a shape, and the upper mold and the lower mold are heated to 170 ° C., and the cut sheet is put into the mold, pressurized, and then cooled while the mold is pressed. Then, the product was taken out at room temperature to obtain a product of the diaphragm 3 as shown in FIG. In addition, the above-mentioned 3t sheet was previously heated to about 180 ° C. in a mold at room temperature, and quickly put into the mold.
A similar product was obtained when pressure was applied.
【００１３】ここで用いた形状記憶性ゴムのＥＰＴゴム
組成は表２のとおりである。The EPT rubber composition of the shape memory rubber used here is as shown in Table 2.
【００１４】[0014]
【表２】 [Table 2]
【００１５】実施例２ 実施例１と同じ要領で、表２のＥＰＴゴム組成物を用
い、図１と同様な形状で厚みのみ１ｔ(１mm)であるダイ
ヤフラムにおいて、ゴム１ｔ中の厚み中央にナイロン織
布を挿入加硫接着した平シートを作成し、実施例１の下
型、すなわち突起を持つ側の金型において、突起の付け
根に等間隔で、２φ程度の穴をあけ、この穴より空気が
抜ける道を作り、真空ポンプに連結し真空ポンプを稼働
させておき、オーブン中で約180℃に加熱した上記平シ
ートを金型に押しつければ、シートと金型間が真空とな
り、大気圧がシートに負荷され、シートは金型形状に変
形し、金型により冷却された後、取り外し、製品に不要
な部分を裁断にて取り除けば所要の製品となる、いわゆ
る真空成型にて製造可能であった。Example 2 In the same manner as in Example 1, using the EPT rubber composition shown in Table 2, a diaphragm having the same shape as that of FIG. A flat sheet with a woven fabric inserted and vulcanized was prepared, and holes of about 2φ were made at regular intervals at the base of the protrusions in the lower mold of Example 1, ie, the mold having the protrusions, and air was passed through the holes. If the flat sheet heated to about 180 ° C in an oven is pressed against a mold, a vacuum is created between the sheet and the mold, and the atmospheric pressure is established. Is applied to the sheet, the sheet is deformed into a mold shape, cooled by the mold, removed, and unnecessary parts of the product are removed by cutting, so that the required product can be manufactured by so-called vacuum molding. there were.
【００１６】特に、厚み１ｔのダイヤフラムは金型精度
や、布の乱れによる不良等でコスト高であるが、真空成
形では、金型も上下必要でなく、片面でよく、布もゴム
の中央からはずれることなく性能よく、かつ経済的に製
造できた。In particular, a diaphragm having a thickness of 1 t is expensive due to mold accuracy, defects due to turbulence of the cloth, and the like. However, in vacuum molding, the mold does not need to be up and down, and only one side is required. It was able to be manufactured with good performance and economical without falling off.
【００１７】実施例３ 実施例１と同じ要領にて未加硫ＮＢＲの中央にナイロン
織布を挿入し、150℃にて加硫し、厚み３ｔの平シート
を作る。そのシートをダイヤフラムの金型に入れ、100
℃にて加圧し冷却後脱型した。ＮＢＲゴム組成は、表３
に示すとおりである。Example 3 In the same manner as in Example 1, a nylon woven fabric is inserted into the center of the unvulcanized NBR and vulcanized at 150 ° C. to produce a flat sheet having a thickness of 3 t. Place the sheet in the diaphragm mold,
It was pressurized at ℃ and cooled, and then released. Table 3 shows the NBR rubber composition.
As shown in FIG.
【００１８】[0018]
【表３】 [Table 3]
【００１９】実施例４ 実施例１と同じ要領にてフッ素ゴムにつき図１と同様の
形状を平シートを170℃に加熱し、圧空成形型により製
造した。フッ素ゴム組成物の配合比を表４に示す。Example 4 In the same manner as in Example 1, a flat sheet of fluororubber having the same shape as that shown in FIG. Table 4 shows the compounding ratio of the fluororubber composition.
【００２０】[0020]
【表４】 [Table 4]
【００２１】[0021]
【発明の効果】本発明の補強布入りゴム製品の製造方法
によると、次のような効果が得られる。 (1)中央に布が入った加硫シートを用いるので、製品の
一部に補強布が露出することなく、寿命が長くなる。 (2)従来方法で起こる製造時のエア入りや、布の繊維の
粗密による製品の変形が少なく不良率が低下する。 (3)従来方法の生造り予備成形が不要で経済的である。 (4)従来方法は、上下金型が必要であるが、真空成形を
用いれば、片面の型でよく、更に、金型は金属でなくて
もよく、型取用のゴムやプラスチック、木材等を使用で
き、金属より形状加工性のよい材質が選べ、より色々な
形状の製品も容易にしかも安価にて、製造できる。According to the method for producing a rubber product containing a reinforcing cloth of the present invention, the following effects can be obtained. (1) Since a vulcanized sheet containing a cloth is used in the center, the reinforcing cloth is not exposed to a part of the product, and the life is extended. (2) There is little deformation of the product due to aeration at the time of production, which occurs in the conventional method, and the density of the fibers of the cloth is small, and the defective rate is reduced. (3) It is economical because there is no need for prefabricated preforming of the conventional method. (4) The conventional method requires upper and lower molds, but if vacuum molding is used, a single-sided mold may be used.Moreover, the mold may not be made of metal, and rubber, plastic, wood, etc. for molding may be used. It is possible to select a material having better shape workability than metal, and it is possible to manufacture products of various shapes easily and at low cost.
【図１】本発明の製造工程で得られたダイヤフラム製品
の断面図である。FIG. 1 is a cross-sectional view of a diaphragm product obtained in a manufacturing process of the present invention.
１ 形状記憶ゴム層 ２ 補強布 ３ ダイヤフラム DESCRIPTION OF SYMBOLS 1 Shape memory rubber layer 2 Reinforcement cloth 3 Diaphragm
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｋ 105:24 Ｂ２９Ｌ 9:00 Ｆターム(参考） 4F100 AK46 AK64 AN00B AN00C BA03 BA06 BA13 DG11A EC182 EH112 EH312 EJ062 EJ172 EJ212 EJ242 EJ422 EJ502 EJ932 GB51 JL02 JL04 JL15B JL15C 4F202 AA09 AA29 AA45 AA46 AB03 AB16 AB17 AB19 AD19 AE01 AG01 AG03 AR06 CA09 CA17 CB01 CN01 CN05 4F203 AA09 AA29 AA45 AA46 AB03 AB16 AB17 AB19 AD16 AE01 AG01 AG03 AR06 DA03 DA06 DB01 DC01 DC27 DJ01 DJ05 DK07 DL10 4F210 AA09 AA29 AA45 AA46 AB03 AB16 AB17 AB19 AD16 AE01 AG01 AG03 AR06 RA01 RC04 RG01 RG04 RG09 RG11 RG22──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B29K 105: 24 B29L 9:00 F term (Reference) 4F100 AK46 AK64 AN00B AN00C BA03 BA06 BA13 DG11A EC182 EH112 EH312 EJ062 EJ172 EJ212 EJ242 EJ422 EJ502 EJ932 GB51 JL02 JL04 JL15B JL15C 4F202 AA09 AA29 AA45 AA46 AB03 AB16 AB17 AB19 AD19 AE01 AG01 AG03 AR06 CA09 CA17 CB01 CN01 CN05 4F203 AA09 AA29 AA45 A01 AB03 DC01 DK07 DL10 4F210 AA09 AA29 AA45 AA46 AB03 AB16 AB17 AB19 AD16 AE01 AG01 AG03 AR06 RA01 RC04 RG01 RG04 RG09 RG11 RG22
Claims (2)
つ未加硫ゴムを加硫接着させた補強布入り平ゴム加硫シ
ートを作製した後、形状記憶ゴムの変態温度以上に平シ
ートを加熱し、所定形状に加圧、変形させたまま変態温
度以下に冷却した後、脱型することを特徴とする補強布
入りゴム製品の製造方法。After vulcanizing both sides of a reinforcing cloth, a vulcanized rubber sheet containing a reinforcing cloth is formed by vulcanizing and bonding an unvulcanized rubber having shape memory properties. A method for producing a rubber product containing a reinforcing cloth, wherein a flat sheet is heated, pressurized and deformed into a predetermined shape, cooled to a transformation temperature or lower, and then demolded.
形は、上下金型あるいは真空・圧空成形型で行なう請求
項１記載の補強布入りゴム製品の製造方法。2. The method for producing a rubber product containing a reinforcing cloth according to claim 1, wherein the pressurization and deformation of the flat rubber vulcanized sheet containing the reinforcing cloth are performed using upper and lower dies or a vacuum / pressure-air forming mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34430498A JP2000167927A (en) | 1998-12-03 | 1998-12-03 | Manufacture of rubber product including reinforcing cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34430498A JP2000167927A (en) | 1998-12-03 | 1998-12-03 | Manufacture of rubber product including reinforcing cloth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000167927A true JP2000167927A (en) | 2000-06-20 |
Family
ID=18368214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34430498A Pending JP2000167927A (en) | 1998-12-03 | 1998-12-03 | Manufacture of rubber product including reinforcing cloth |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000167927A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007023228A (en) * | 2005-07-21 | 2007-02-01 | Nichias Corp | Sealing structure and method for producing the same |
-
1998
- 1998-12-03 JP JP34430498A patent/JP2000167927A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007023228A (en) * | 2005-07-21 | 2007-02-01 | Nichias Corp | Sealing structure and method for producing the same |
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