JP2577690B2 - Non-circular bellows and blow molding method for non-circular bellows - Google Patents
Non-circular bellows and blow molding method for non-circular bellowsInfo
- Publication number
- JP2577690B2 JP2577690B2 JP5022050A JP2205093A JP2577690B2 JP 2577690 B2 JP2577690 B2 JP 2577690B2 JP 5022050 A JP5022050 A JP 5022050A JP 2205093 A JP2205093 A JP 2205093A JP 2577690 B2 JP2577690 B2 JP 2577690B2
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- height
- region
- peak
- blow molding
- 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.)
- Expired - Fee Related
Links
- 238000000071 blow moulding Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000000474 nursing effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints; Joints allowing movement
- F16L27/12—Adjustable joints; Joints allowing movement allowing substantial longitudinal adjustment or movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/703—Bellows
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Joints Allowing Movement (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、伸縮を必要とする機械
又は昇降装置のカバー等に用いられるベローズに関し、
特にブロー成形により成形された断面非円形のベロー
ズ、及び非円形ベローズのブロー成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows used for a cover or the like of a machine which needs expansion and contraction or a lifting device.
In particular, the present invention relates to a bellows having a non-circular cross-section formed by blow molding and a method for blow-molding the non-circular bellows.
【０００２】[0002]
【従来の技術】従来より知られている角形ベローズ１
は、図４〜６に示すように、山２の高さ（谷３から山の
頂点までの距離）ｈがその全周に渡り同一高さに形成さ
れている。この角形ベローズ１は、周知のごとく、まず
円筒形のパリソンを押し出し成形し、これを角形ベロー
ズ成形用金型内に配置し、続いてパリソン内にエアを吹
き込み、パリソンを該金型内面に沿った角形ベローズ形
状に成形するものであるが、角形ベローズ１の直線部
（長辺部４と短辺部５）とコーナー部６におけるパリソ
ンの延伸の度合が異なるため、直線部４、５とコーナー
部６で山２の肉厚が大きく異なっていた。2. Description of the Related Art Conventionally known square bellows 1
As shown in FIGS. 4 to 6, the height h of the peak 2 (the distance from the valley 3 to the top of the peak) h is formed at the same height over the entire circumference. As is well known, the square bellows 1 first extrudes a cylindrical parison, places it in a mold for forming a square bellows, then blows air into the parison, and moves the parison along the inner surface of the mold. However, since the degree of extension of the parison at the straight part (long side part 4 and short side part 5) and the corner part 6 of the square bellows 1 is different from that of the straight part 4, 5 and the corner part. In section 6, the thickness of the mountain 2 was greatly different.
【０００３】これは、金型内に配置された断面円形のパ
リソン（金型で両端を挟みつけられているので実際には
楕円形となっているものと思われる）は、エアの吹き込
みにより膨張して金型壁面に接触し、時間の経過に従い
金型壁面との接触領域を広げていくが、パリソンが金型
壁面のいずれかの箇所に接触すると同時に、接触した箇
所のパリソンの延伸が事実上ストップ（以後の肉厚変化
がない）し、以後の延伸はパリソンの残りの部分で賄わ
れるためである。[0003] This is because a parison having a circular cross section arranged in a mold (it seems to be actually an elliptical shape because both ends are sandwiched by the mold) is inflated by blowing air. The mold touches the mold wall and expands the area of contact with the mold wall over time, but at the same time that the parison contacts any part of the mold wall, the parison stretches at the point of contact. This is because the upper stop is performed (there is no change in wall thickness thereafter), and the subsequent stretching is covered by the rest of the parison.
【０００４】図４〜６に示す角形ベローズ１の場合、パ
リソンは最初に金型７（図６参照）の内壁面先端７ａ
（ベローズの谷３に対応する部分）の長辺を形成する領
域に接触（図５の仮想線Ｐ1参照）し、次第に接触領域
を広げながら膨張し、次に短辺を形成する領域に接触
（図５の仮想線Ｐ2参照）し、続いてコーナー部を形成
する領域に接触する。先の説明からも分かるように、こ
の時点で、長辺部４のパリソンの肉厚が最も厚く、コー
ナー部６の肉厚が最も薄い。そして、最後にパリソン全
体が金型７の内壁面にリング状に多数形成された凹所８
に向い張り出し、パリソン断面全周に渡りベローズの山
２が形成される。金型７の内壁面に形成された凹所８の
深さは金型内壁面全域で均一に形成されているので、角
形ベローズ１の直線部、特にその長辺部４の山の肉厚が
最も厚く、コーナー部６の山の肉厚が相対的に最も薄く
形成されることになる。[0004] In the case of the square bellows 1 shown in FIGS.
Contacting the region for forming the long side of (portions corresponding to the valley 3 bellows) (see imaginary line P 1 in FIG. 5), expands with an increasing progressively contact region, then contacts the region for forming the short sides (phantom line P 2 see FIG. 5), followed by contact with the region forming the corner portion. As can be seen from the above description, at this point, the parison of the long side 4 is the thickest, and the corner 6 is the thinnest. Finally, the entire parison has many recesses 8 formed in a ring shape on the inner wall surface of the mold 7.
The bellows 2 is formed over the entire parison cross section. Since the depth of the recess 8 formed on the inner wall surface of the mold 7 is uniformly formed over the entire inner wall surface of the mold, the thickness of the straight portion of the rectangular bellows 1, particularly, the thickness of the mountain of the long side portion 4 is reduced. The peak thickness of the corner 6 is relatively thinnest.
【０００５】このような偏肉の大きい角形ベローズ１を
伸縮させると、伸ばしたときは薄肉のコーナー部６の山
の強度が低いためそこに縦シワが発生しやすいという問
題点がある。逆に角形ベローズ１を縮めたときは、ベロ
ーズの山２の一部が外側又は内側に突き出る胴膨れや胴
縮み等の現象が発生しやすいという問題点がある。これ
は、ベローズが縮むことにより山２が平に押さえられ、
山２の高さｈを大きくしようとする力（山を外周側に広
げようとする力）が働き、一方、直線部４、５の特に中
央付近の山は厚肉で強度が高くその力により容易に外周
側に広がらないため、上記のような異常変形が起こるも
のと考えられる。[0005] When such a rectangular bellows 1 having a large uneven thickness is expanded or contracted, there is a problem that, when the bellows 1 is expanded, the crests of the thin corner portions 6 have low strength, and vertical wrinkles are liable to occur there. Conversely, when the rectangular bellows 1 is contracted, there is a problem that phenomena such as trunk swelling and trunk shrinkage in which a part of the bellows ridge 2 protrudes outward or inward tend to occur. This is because the bellows shrinks and the mountain 2 is held flat,
The force to increase the height h of the mountain 2 (the force to expand the mountain toward the outer periphery) acts, while the mountain near the center of the straight portions 4, 5 is thick and strong, and the strength is high. Since it does not easily spread to the outer peripheral side, it is considered that the above abnormal deformation occurs.
【０００６】さらに、このような肉厚差の大きい角形ベ
ローズ１をいっぱいに縮めたとき、直線部４、５とコー
ナー部６の厚みが異なるという不都合もあった。このた
め、従来の角形ベローズ１では大きい伸縮や曲げが十分
にできず、またこのような問題点はベローズ自身の破損
や内蔵した機器類との接触の原因ともなっていた。Furthermore, when the bellows 1 having such a large thickness difference is fully contracted, there is another inconvenience that the thicknesses of the straight portions 4, 5 and the corner portions 6 are different. For this reason, the conventional rectangular bellows 1 cannot sufficiently expand and contract or bend sufficiently, and such problems have caused damage to the bellows itself and contact with built-in equipment.
【０００７】上記問題点を解決するため、角形ベローズ
のコーナー部に相当する部分の肉厚を厚くした偏肉パリ
ソンを使用し、コーナー部の薄肉化を回避することも一
応考えられるが、偏肉パリソンを成形する押し出しダイ
スの精度を確保するのが困難であるとともに、ダイス製
造コストの面でも不利であり、さらにパリソンの偏肉は
製品の偏肉を著しく拡大する傾向を有することからブロ
ー成形の条件管理が極めて厳しくなることが予想され、
現実的解決策とはなり得ない。In order to solve the above problem, it is conceivable to use an uneven thickness parison having a thicker portion at a portion corresponding to the corner portion of the square bellows to avoid thinning of the corner portion. It is difficult to ensure the accuracy of the extrusion die that forms the parison, and it is disadvantageous in terms of die manufacturing cost.In addition, the uneven thickness of the parison tends to significantly increase the uneven thickness of the product, so the blow molding is difficult. Condition management is expected to be extremely strict,
It cannot be a practical solution.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、従来の非円
形ベローズが有する上記問題点に鑑みてなされたもの
で、均一な肉厚の円筒形パリソンを使用し、ブロー成形
により断面が非円形のベローズを得る場合において、ベ
ローズの山の肉厚の周方向における変動を緩和し、さら
には、可能な範囲内でベローズの山の肉厚をコントロー
ルすることを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional non-circular bellows, and uses a cylindrical parison having a uniform thickness and has a non-circular cross-section by blow molding. In the case of obtaining the bellows, it is an object of the present invention to alleviate the fluctuation in the circumferential direction of the thickness of the bellows peak and to control the thickness of the bellows peak within a possible range.
【０００９】[0009]
【課題を解決するための手段】上記目的のため、本発明
は、ブロー成形により得られた断面非円形のベローズに
おいて、周方向における曲率の大きい領域の山の高さを
曲率の小さい領域の山の高さより低くしたことを特徴と
し、あるいは、ブロー成形により得られた断面非円形の
ベローズにおいて、断面の中心からの距離が遠い領域の
山の高さを近い領域の山の高さより低くしたことを特徴
とする。In order to achieve the above object, the present invention relates to a bellows having a non-circular cross section obtained by blow molding, wherein the height of a peak in a region having a large curvature in the circumferential direction is changed to a peak in a region having a small curvature. Characterized in that the height of the peaks in the region far from the center of the cross section is lower than the height of the peaks in the near region in the non-circular bellows obtained by blow molding. It is characterized by.
【００１０】また、本発明に関わる非円形ベローズの成
形方法は、均一な肉厚を有する円筒状パリソンを使用し
ブロー成形により断面非円形のベローズを成形する際、
成形する山の高さを周方向において変化させることを特
徴とする。好ましくは、周方向においてパリソンが金型
内壁面に遅く接触する領域の山の高さを早く接触する領
域の山の高さより低くすることを特徴とし、さらに表現
を変えて言えば、本発明に関わる非円形ベローズの成形
方法は、周方向において曲率の大きい領域の山の高さを
曲率の小さい領域の山の高さより低く成形する、あるい
は、断面の中心からの距離が遠い領域の山の高さを近い
領域の山の高さより低く成形することを特徴とするもの
である。The method of forming a non-circular bellows according to the present invention is characterized in that a bellows having a non-circular cross section is formed by blow molding using a cylindrical parison having a uniform thickness.
The height of the mountain to be formed is changed in the circumferential direction. Preferably, in the circumferential direction, the height of the ridge in the region where the parison contacts the inner wall surface of the mold late is set to be lower than the height of the ridge in the region where the parison contacts early. The method of forming the non-circular bellows involves forming the height of the peak in the region with a large curvature in the circumferential direction lower than the height of the peak in the region with a small curvature, or the height of the peak in a region far from the center of the cross section. It is characterized in that the height is formed to be lower than the height of the peak in the near area.
【００１１】[0011]
【作用】本発明は、このように均一な肉厚を有する円筒
状パリソンをブロー成形することにより得られた非円形
ベローズにおいて、周方向でベローズの山の高さを変化
させることにより山の肉厚の周方向における変動を緩和
し、均一化することができる。すなわち、周方向におい
てパリソンが金型内壁面に遅く接触する領域（曲率の大
きい領域、中心からの距離が遠い領域）は、早く接触す
る領域（曲率の小さい領域、中心からの距離が近い領
域）に比べパリソン肉厚が薄くなっているが、本発明で
は、前者の領域では山の高さを相対的に低く、後者の領
域では山の高さを相対的に高くしているので、最終的に
パリソンにベローズの山が成形されたときには、その肉
厚差が緩和されているものである。According to the present invention, in a non-circular bellows obtained by blow-molding a cylindrical parison having a uniform thickness as described above, the height of the peak of the bellows is changed in the circumferential direction. Fluctuations in the circumferential direction of the thickness can be reduced and made uniform. That is, a region where the parison makes slow contact with the inner wall surface of the mold in the circumferential direction (a region with a large curvature, a region with a long distance from the center) is a region with a fast contact (a region with a small curvature, a region with a short distance from the center). Although the parison thickness is smaller than that in the present invention, in the present invention, the height of the peak is relatively low in the former region, and the height of the peak is relatively high in the latter region. When the peaks of the bellows are formed on the parison, the difference in wall thickness is reduced.
【００１２】さらに、本発明は、ベローズの山の肉厚の
周方向における変動を緩和し均一化するにとどまらず、
一般的にベローズの山の肉厚をコントロールする手段と
して利用され得るものである。例えば、実施例で述べる
角形ベローズにおいては、コーナー部の山の肉厚を直線
部の山の肉厚よりやや厚目（０〜１０％程度）に形成す
るのがより効果的である。Further, the present invention is not limited to alleviating and uniformizing fluctuations in the circumferential direction of the thickness of the bellows peaks.
Generally, it can be used as a means for controlling the thickness of the bellows mountain. For example, in the case of the square bellows described in the embodiment, it is more effective to form the mountain of the corner portion slightly thicker (about 0 to 10%) than the mountain of the straight portion.
【００１３】[0013]
【実施例】以下、本発明の実施例を図１〜図３を参照し
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１４】本実施例の角形ベローズ１１は、介護用上
下可動ベッドの駆動部分のカバーとして使用されるもの
で、内周部分の大きさ（ａ×ｂ）が３９４ｍｍ×６１４
ｍｍ、長さｃが７００ｍｍのポリプロピレン系エラスト
マー製ベローズであり、山１２の肉厚が全周でほぼ均等
になるように、その高さｈを長辺部１４の中心（Ｂ−Ｂ
断面）で４１ｍｍ、短辺部１５の中心（Ｃ−Ｃ断面）で
３４．３ｍｍ、コーナー部１６の中心（Ｄ−Ｄ断面）で
２６．２ｍｍとし、その間なだらかに変化させた。The rectangular bellows 11 of the present embodiment is used as a cover for a driving portion of a vertically movable bed for nursing care, and has a size (a × b) of an inner peripheral portion of 394 mm × 614.
mm and a length c of 700 mm made of a polypropylene-based elastomer, and the height h is set to the center of the long side portion 14 (BB) so that the thickness of the peak 12 becomes substantially uniform over the entire circumference.
The cross section was 41 mm, the center of the short side portion 15 (C-C cross section) was 34.3 mm, and the center of the corner portion 16 (DD cross section) was 26.2 mm.
【００１５】本実施例の角形ベローズ１１は、円筒形パ
リソンを押し出しダイスから対向配置された一対の金型
間に押し出し、金型を閉鎖してパリソンの両端を挟み、
次いでパリソン内部にエアを吹き込むという周知のブロ
ー成形方法により製造するものであり、金型１７（図３
（ａ）参照）の内壁面に形成されたリング状の凹部１８
の深さは、目的とする角形ベローズ１１の山の高さｈの
変化に応じたものとされる。The square bellows 11 of this embodiment extrudes a cylindrical parison from an extrusion die between a pair of dies opposed to each other, closes the dies, sandwiches both ends of the parison,
Then, the mold is manufactured by a well-known blow molding method in which air is blown into the inside of the parison.
(See (a))) ring-shaped recess 18 formed on the inner wall surface
Is determined according to a change in the height h of the peak of the target rectangular bellows 11.
【００１６】この角形ベローズ１１を、介護用上下可動
ベッドの駆動部分のカバーとして使用したところ、２０
０ｍｍ〜７００ｍｍの伸縮にも縦シワ、胴膨れ、胴縮み
等の異常変形が生ずることがなく、また、縮めたときの
厚みが全周でほぼ均等であった。When this rectangular bellows 11 was used as a cover for a drive part of a vertically movable bed for nursing care,
No abnormal deformation such as vertical wrinkling, trunk swelling, trunk shrinkage, etc. occurred during expansion and contraction from 0 mm to 700 mm, and the thickness when contracted was almost uniform over the entire circumference.
【００１７】なお、本実施例で使用する金型１７では、
図６（ａ）の部分拡大図に明瞭に示すように、ベローズ
の谷１３に対応する部分１７ａを全て先端が鋭く尖った
クサビ形状としたので、ベローズの谷１３の底の厚みが
薄く外力により変形しやすくなり、伸縮性に富んだベロ
ーズが形成された。Incidentally, in the mold 17 used in this embodiment,
As clearly shown in the partial enlarged view of FIG. 6A, all the portions 17a corresponding to the valleys 13 of the bellows are formed in a wedge shape having a sharp pointed tip. It became easily deformed, and a bellows with high elasticity was formed.
【００１８】[0018]
【発明の効果】本発明によれば、均一な肉厚の円筒形パ
リソンを使用し、ブロー成形により断面が非円形のベロ
ーズを得る場合において、ベローズの山の肉厚の周方向
における変動を緩和し、さらには、可能な範囲内でベロ
ーズの山の肉厚をコントロールすることができる。According to the present invention, when a cylindrical parison having a uniform thickness is used and a bellows having a non-circular cross section is obtained by blow molding, fluctuations in the circumferential direction of the thickness of the mountain of the bellows are reduced. Further, the thickness of the bellows mountain can be controlled as much as possible.
【図１】本発明に関わる角形ベローズの正面図である。FIG. 1 is a front view of a square bellows according to the present invention.
【図２】同側面図である。FIG. 2 is a side view of the same.
【図３】図２のＢ−Ｂ断面図（ａ）、Ｃ−Ｃ断面図
（ｂ）及びＤ−Ｄ断面図（ｃ）である。なお、（ａ）に
は金型の断面を一部併記し、ベローズの谷の部分の拡大
図を示した。3 is a sectional view taken along line BB (a), a sectional view taken along line CC (b), and a sectional view taken along line DD (c) of FIG. 2; (A) also shows a part of the cross section of the mold and an enlarged view of a valley portion of the bellows.
【図４】従来の角形ベローズの正面図である。FIG. 4 is a front view of a conventional rectangular bellows.
【図５】同側面図である。FIG. 5 is a side view of the same.
【図６】図５のＡ−Ａ断面図（金型の断面も一部併記）
である。FIG. 6 is a sectional view taken along line AA of FIG.
It is.
１１ 角形ベローズ １２ ベローズの山 １３ ベローズの谷 １４ 長辺部 １５ 短辺部 １６ コーナー部 １７ ブロー成形用金型 １８ 金型の凹所 11 Square Bellows 12 Bellows Crest 13 Bellows Valley 14 Long Side 15 Short Side 16 Corner 17 Blow Mold 18 Concavity of Mold
Claims (6)
ベローズにおいて、周方向における曲率の大きい領域の
山の高さを曲率の小さい領域の山の高さより低くしたこ
とを特徴とする非円形ベローズ。1. A non-circular bellows having a non-circular cross-section obtained by blow molding, wherein a height of a peak in a region having a large curvature in a circumferential direction is lower than a height of a peak in a region having a small curvature. .
ベローズにおいて、断面の中心からの距離が遠い領域の
山の高さを近い領域の山の高さより低くしたことを特徴
とすることを特徴とする非円形ベローズ。2. A bellows having a non-circular cross section obtained by blow molding, wherein the height of a peak in a region far from the center of the cross section is lower than the height of a peak in a near region. And non-circular bellows.
用しブロー成形により断面非円形のベローズを成形する
際、成形する山の高さを周方向において変化させること
を特徴とする非円形ベローズのブロー成形方法。3. When a bellows having a non-circular cross section is formed by blow molding using a cylindrical parison having a uniform wall thickness, the height of the peak to be formed is changed in the circumferential direction. Blow molding method.
遅く接触する領域の山の高さを早く接触する領域の山の
高さより低く成形することを特徴とする、請求項３に記
載された周方向で山の高さの変化する非円形ベローズの
ブロー成形方法。4. The method according to claim 3, wherein in the circumferential direction, the height of the ridge in the region where the parison makes slow contact with the inner wall surface of the mold is formed lower than the height of the ridge in the region where the parison makes quick contact. A blow molding method for non-circular bellows whose height changes in the circumferential direction.
高さを曲率の小さい領域の山の高さより低く成形するこ
とを特徴とする、請求項３に記載された周方向で山の高
さの変化する非円形ベローズのブロー成形方法。5. The height of the ridge in the circumferential direction according to claim 3, wherein the height of the ridge in the region with a large curvature in the circumferential direction is formed lower than the height of the ridge in the region with a small curvature. Blow molding method for non-circular bellows that changes.
高さを近い領域の山の高さより低く成形することを特徴
とする、請求項３に記載された周方向で山の高さの変化
する非円形ベローズのブロー成形方法。6. The height of the peak in the circumferential direction according to claim 3, wherein the height of the peak in a region far from the center of the cross section is lower than the height of the peak in a near region. Blow molding method for non-circular bellows that changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022050A JP2577690B2 (en) | 1993-01-16 | 1993-01-16 | Non-circular bellows and blow molding method for non-circular bellows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022050A JP2577690B2 (en) | 1993-01-16 | 1993-01-16 | Non-circular bellows and blow molding method for non-circular bellows |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06210711A JPH06210711A (en) | 1994-08-02 |
| JP2577690B2 true JP2577690B2 (en) | 1997-02-05 |
Family
ID=12072100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5022050A Expired - Fee Related JP2577690B2 (en) | 1993-01-16 | 1993-01-16 | Non-circular bellows and blow molding method for non-circular bellows |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2577690B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100534063B1 (en) * | 2003-08-22 | 2005-12-07 | 심세유 | apparatus and method for manufacturing a blow-molded fluoropolymeric bellows with an uniform thickness |
-
1993
- 1993-01-16 JP JP5022050A patent/JP2577690B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06210711A (en) | 1994-08-02 |
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