JPS6129858B2 - - Google Patents
Info
- Publication number
- JPS6129858B2 JPS6129858B2 JP55007928A JP792880A JPS6129858B2 JP S6129858 B2 JPS6129858 B2 JP S6129858B2 JP 55007928 A JP55007928 A JP 55007928A JP 792880 A JP792880 A JP 792880A JP S6129858 B2 JPS6129858 B2 JP S6129858B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- bottle
- parison
- temperature
- heat
- 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
Links
- 238000000034 method Methods 0.000 claims description 16
- 239000004033 plastic Substances 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000000137 annealing Methods 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000000071 blow moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/16—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing
-
- 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
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
-
- 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
- B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、熱安定性の優れたプラスチツクボト
ルの成形法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding plastic bottles with excellent thermal stability.
一般に、ポリエチレン、ポリプロピレン等の熱
可塑性樹脂からなるパリソンを二軸延伸して得ら
れたプラスチツクボトルは熱安定性に乏しく、高
温物質を充填したときに延伸成形時に生じた応力
歪のもどりによつて変形することがある。 In general, plastic bottles obtained by biaxially stretching parisons made of thermoplastic resins such as polyethylene and polypropylene have poor thermal stability, and when filled with high-temperature substances, the plastic bottles are susceptible to stress distortion caused during stretching and molding. May be deformed.
そこで、従来から二軸延伸したボトルに熱処理
を施して結晶化させることにより熱安定性を高め
ることが行われていたが、近年プラスチツクボト
ルに内容物を充填する場合、高温殺菌した直後の
高温状態のままで充填することが常識化してお
り、プラスチツクボトルに対する熱安定性の要求
が一層高まつている。 Conventionally, biaxially stretched bottles were heat-treated to crystallize them to increase their thermal stability.However, in recent years, when filling plastic bottles with contents, it has been necessary to use high-temperature conditions immediately after high-temperature sterilization. It has become common practice to fill plastic bottles as they are, and the demand for thermal stability for plastic bottles is increasing.
本発明はかかる要望に則したプラスチツクボト
ルの成形法を提供するものであつて、その要旨と
するところは、延伸適温に加熱したパリソンを該
パリソンの結晶化温度以上、溶融温度以下に加熱
した成形金型内にセツトし、該パリソン内に加圧
流体を吹込んで前記金型内面に密着するまで膨張
させて中間ボトルを成形すると共に更に内圧をか
けたまま所定時間保持して熱処理を施し、次いで
脱圧すると共に金型を型開きして熱処理された中
間ボトルを取り出し、収縮して軟化状態にある中
間ボトルを前記成形金型より若干小さいキヤビテ
イを有し、且つ、60〜150℃に加熱した保温金型
内にセツトし、しかる後該中間ボトル内に加圧流
体を再度吹込んで再膨張させることを特徴とする
プラスチツクボトルの成形法にある。 The present invention provides a method for molding plastic bottles that meets such demands, and the gist of the present invention is to mold a parison that has been stretched to an appropriate temperature and heated to a temperature above the crystallization temperature and below the melting temperature of the parison. The parison is set in a mold, and a pressurized fluid is blown into the parison to inflate it until it comes into close contact with the inner surface of the mold to form an intermediate bottle, and the parison is further held for a predetermined period of time with internal pressure applied to perform heat treatment. The pressure is released, the mold is opened, the heat-treated intermediate bottle is taken out, and the intermediate bottle, which has contracted and is in a softened state, is heated to a temperature of 60 to 150°C and has a cavity slightly smaller than that of the mold. A method of molding a plastic bottle is characterized in that the plastic bottle is set in a mold and then pressurized fluid is again blown into the intermediate bottle to cause it to expand again.
ブロー延伸して得られたプラスチツクボトル
は、軟化状態のままで成形金型内から取り出され
ると、自然収縮を起こし、これと共に延伸時に生
じた応力歪が解消されるという性質を有する。本
発明は、かかるプラスチツクボトルの特性に着目
し、ボトルの延伸工程を二段階に分け、第一段階
では成形金型内で所望とする最終形状に近い中間
ボトルを成形して熱処理を施し、第二段階では収
縮して軟化状態にある前記中間ボトルを第一段階
の成形金型より若干小さいキヤビテイを有する保
温金型内でブロー延伸すると共にアニーリング処
理を施すことにある。 When a plastic bottle obtained by blow-stretching is taken out of a mold while still in a softened state, it naturally shrinks, and along with this, the stress strain generated during stretching is eliminated. The present invention focuses on the characteristics of such plastic bottles and divides the bottle stretching process into two stages. In the first stage, an intermediate bottle close to the desired final shape is formed in a mold and subjected to heat treatment. In the second stage, the intermediate bottle, which is in a contracted and softened state, is blow-stretched in a heat-retaining mold having a cavity slightly smaller than that of the molding mold in the first stage, and is then subjected to an annealing treatment.
本発明の成形法は、ポリエチレン、ポリプロピ
レン、ポリエチレンテレフタレート等の熱可塑性
樹脂を射出成形、又は押出成形して得られたパリ
ソンをブロー延伸して得られるプラスチツクボト
ルに適用できるものであるが、以下発明の成形法
をポリエチレンテレフタレート樹脂からなるパリ
ソンのブロー成形について具体的に説明する。 The molding method of the present invention can be applied to plastic bottles obtained by blow-stretching parisons obtained by injection molding or extrusion molding of thermoplastic resins such as polyethylene, polypropylene, and polyethylene terephthalate. The molding method will be specifically explained with regard to blow molding of a parison made of polyethylene terephthalate resin.
第１図は本発明の第１段階の延伸工程を示す断
面図であつて、図中１は成形金型、２は吹込ノズ
ル、３は延伸ロツド、Ｐはパリソンである。 FIG. 1 is a sectional view showing the first stage of the drawing process of the present invention, in which 1 is a mold, 2 is a blowing nozzle, 3 is a drawing rod, and P is a parison.
成形金型１は、半割状に構成されたキヤビテイ
を有し、金型壁内に設けた流通孔１１には、加熱
オイル等の熱媒体が循環してキヤビテイ壁面がパ
リソンの結晶化温度以上溶融温度以下（130〜230
℃）に加熱されている。 The molding mold 1 has a cavity structured in half, and a heat medium such as heating oil circulates through the circulation holes 11 provided in the mold wall, so that the cavity wall surface reaches a temperature higher than the crystallization temperature of the parison. Below melting temperature (130~230
℃).
吹込ノズル２は、加圧流体源に接続した吹込口
２１を有し、該吹込口２１には上下に摺動自在に
貫通して延伸ロツド３が設けられている。 The blowing nozzle 2 has a blowing port 21 connected to a source of pressurized fluid, and an extending rod 3 is provided through the blowing port 21 so as to be slidable up and down.
本発明の第１段階の延伸工程では延伸適温（80
〜150℃）に加熱したパリソンＰを前記成形金型
１内にセツトし、該パリソンの開口部には吹込ノ
ズル２を装着する。そして、延伸ロツド３をパリ
ソン内に突き出して縦方向に延伸した後、又は縦
方向の延伸を行いつつ吹込口２１より加圧流体
（絶対圧力で10〜30Kg／cm2）を吹込んで金型面に
密着するまで膨張させて中間ボトルを成形し、更
に内圧をかけたまま所定時間保持する。この保持
時間は、金型の壁面温度に依存して適宜決定され
るものであり、例えば壁面温度を130℃に設定し
たときは５秒間、230℃に設定したときは２秒間
保持して中間ボトルに熱処理を施す、このとき、
金型の壁面温度が130℃以下であると結晶化に時
間を要し、効果的な結晶化度が得られず、また、
230℃以上であるとボトル表面に肌あれが生じて
白化する等、良好な熱処理が行えない。 In the first stage of the stretching process of the present invention, the appropriate temperature for stretching (80
A parison P heated to 150 DEG C.) is set in the mold 1, and a blowing nozzle 2 is attached to the opening of the parison. Then, after extending the stretching rod 3 into the parison and stretching it in the longitudinal direction, or while stretching it in the longitudinal direction, pressurized fluid (10 to 30 kg/cm 2 in absolute pressure) is blown into the mold surface from the blowing port 21. An intermediate bottle is formed by expanding the bottle until it comes into close contact with the bottle, and is then held for a predetermined period of time while applying internal pressure. This holding time is determined appropriately depending on the wall temperature of the mold. For example, when the wall temperature is set to 130°C, it is held for 5 seconds, and when it is set to 230°C, it is held for 2 seconds, and the intermediate bottle is held for 2 seconds. At this time, heat treatment is applied to
If the wall temperature of the mold is below 130°C, it will take time for crystallization to occur, making it impossible to obtain an effective degree of crystallinity.
If the temperature is higher than 230°C, the bottle surface will become rough and white, making it impossible to perform a good heat treatment.
しかる後、脱圧すると共に、あるいは、若干内
圧をかけたまま成形金型１を型開きして中間ボト
ルを取り出し、収縮して軟化状態にある間に、該
中間ボトルを保温金型内にセツトして第２段階の
ブロー延伸を行う。 After that, while releasing the pressure or applying a slight internal pressure, the mold 1 is opened and the intermediate bottle is taken out, and while it is in a contracted and softened state, the intermediate bottle is set in a heat-insulating mold. A second stage of blow stretching is performed.
第２図は、本発明の第２段階の延伸工程を示す
断面図であつて、半割状に構成された保温金型４
は、前記成形金型１より若干小さいキヤビテイを
有し（成形金型１のキヤビテイより５〜30％縮少
した形状を有する）、キヤビテイ壁面は流通孔４
１内を循環する熱媒体によつて60〜150℃に加熱
されている。この金型４内に、前記中間ボトルを
セツトし、該ボトル内に加圧流体（絶対圧力で15
〜30Kg／cm2）を吹込んで金型内面に密着するまで
再膨張させ、更に内圧をかけたまま所定時間保持
してアニーリング処理を施す。このアニーリング
処理は第１及び第２段階のブロー延伸によつて生
じた応力歪を消去することを目的とするものであ
つて、アニーリング処理した後、保温金型を型開
きしてプラスチツクボトルを取り出す。 FIG. 2 is a cross-sectional view showing the second-stage stretching process of the present invention, and shows a heat-retaining mold 4 having a half-split shape.
has a cavity slightly smaller than the molding die 1 (having a shape that is 5 to 30% smaller than the cavity of the molding die 1), and the wall surface of the cavity has a communication hole 4.
It is heated to 60 to 150°C by a heat medium circulating inside the chamber. The intermediate bottle is set in this mold 4, and pressurized fluid (absolute pressure 15
~30Kg/cm 2 ) is blown into the mold to expand it again until it comes into close contact with the inner surface of the mold, and then annealing is performed by holding the mold for a predetermined period of time while applying internal pressure. The purpose of this annealing treatment is to eliminate stress and strain caused by the blow stretching in the first and second stages.After the annealing treatment, the heat-insulating mold is opened and the plastic bottle is taken out. .
尚、前記成形法は、本発明の一実施例を示すも
のであつて、本発明の要旨を変更しない限り、
種々の実施態様を取り得ることは勿論のことであ
る。例えば、第３図に示すように、第２段階のブ
ロー延伸を行う保温金型を半割金型４ａと、同芯
状の複数個のスライド筒体からなる底部金型４ｂ
とから構成し、第２段階のブロー成形を行つた
後、ボトル内に内圧をかけたままの状態で底部金
型４ｂを上方にスライドさせてボトルの底部のみ
を延伸し、更にボトルに内圧をかけたまま所定時
間保持してアニーリング処理を施すこともでき
る。 It should be noted that the above-mentioned molding method shows one embodiment of the present invention, and unless the gist of the present invention is changed,
Of course, various embodiments are possible. For example, as shown in FIG. 3, a heat-retaining mold for the second stage of blow stretching is a half-split mold 4a, and a bottom mold 4b consisting of a plurality of concentric slide cylinders.
After performing the second stage of blow molding, the bottom mold 4b is slid upward while applying internal pressure inside the bottle to stretch only the bottom of the bottle, and further internal pressure is applied to the bottle. It is also possible to carry out an annealing treatment by holding it for a predetermined period of time.
以上詳述した如く、本発明の成形方法は第１段
階の延伸工程で中間ボトルを延伸成形すると共に
熱処理を施し、第２段階の延伸工程で前記中間ボ
トルを収縮する以前より若干小さい形状まで再延
伸すると共に応力歪を消去するアニーリング処理
を施すので、このようにして得られたプラスチツ
クボトルはブロー延伸した後、単に熱処理しただ
けの従来のボトルと比較して著しく熱安定性が高
く、高温物質の充填による変形、収縮が極めて少
ない。 As detailed above, in the forming method of the present invention, the intermediate bottle is stretch-molded and heat treated in the first stage stretching process, and the intermediate bottle is reshaped into a slightly smaller shape than before shrinking in the second stage stretching process. Since the plastic bottles obtained in this way are stretched and subjected to an annealing treatment to eliminate stress and strain, they have significantly higher thermal stability than conventional bottles that are simply heat treated after blow stretching, and can withstand high-temperature materials. Deformation and shrinkage due to filling are extremely small.
第１図は、本発明の第１段階の延伸工程を示す
縦断面図、第２図保温金型内での第２段階の延伸
工程を示す縦断面図、第３図は保温金型の他の実
施例を示す縦断面図である。
１……成形金型、２……吹込ノズル、３……延
伸ロツド、４……保温金型、Ｐ……パリソン。
FIG. 1 is a longitudinal cross-sectional view showing the first-stage stretching process of the present invention, FIG. 2 is a vertical cross-sectional view showing the second-stage stretching process inside the heat-retaining mold, and FIG. FIG. 1... Molding mold, 2... Blowing nozzle, 3... Stretching rod, 4... Heat retention mold, P... Parison.
Claims (1)
結晶化温度以上、溶融温度以下に加熱した成形金
型内にセツトし、該パリソン内に加圧流体を吹込
んで前記金型内面に密着するまで膨張させて中間
ボトルを成形すると共に更に内圧をかけたまま所
定時間保持して熱処理を施し、次いで脱圧すると
共に金型を型開きして熱処理された中間ボトルを
取り出し、収縮して軟化状態にある中間ボトルを
前記成形金型より若干小さいキヤビテイを有し、
且つ、60〜150℃に加熱した保温金型内にセツト
し、しかる後、該中間ボトル内に加圧流体を再度
吹込んで再膨張させることを特徴とするプラスチ
ツクボトルの成形法。1. Stretching A parison heated to an appropriate temperature is set in a mold heated to a temperature above the crystallization temperature and below the melting temperature of the parison, and a pressurized fluid is blown into the parison to expand it until it comes into close contact with the inner surface of the mold. The intermediate bottle is then molded, and the internal pressure is maintained for a predetermined period of time to perform heat treatment.Then, the pressure is released, the mold is opened, and the heat-treated intermediate bottle is taken out.The intermediate bottle is shrunk and softened. The mold has a slightly smaller cavity than the mold described above,
A method for molding a plastic bottle, which comprises setting the plastic bottle in a heat-insulating mold heated to 60 to 150°C, and then blowing pressurized fluid into the intermediate bottle again to re-expand it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP792880A JPS56105935A (en) | 1980-01-26 | 1980-01-26 | Forming of plastic bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP792880A JPS56105935A (en) | 1980-01-26 | 1980-01-26 | Forming of plastic bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56105935A JPS56105935A (en) | 1981-08-22 |
| JPS6129858B2 true JPS6129858B2 (en) | 1986-07-09 |
Family
ID=11679177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP792880A Granted JPS56105935A (en) | 1980-01-26 | 1980-01-26 | Forming of plastic bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56105935A (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59179318A (en) * | 1983-03-31 | 1984-10-11 | Katashi Aoki | Biaxial orientation blow molding method of polypropylene |
| US4522779A (en) * | 1983-11-28 | 1985-06-11 | Owens-Illinois, Inc. | Method for production of poly(ethylene terephthalate) articles |
| US5445784A (en) * | 1984-02-15 | 1995-08-29 | Yoshino Kogyosho Co., Ltd. | Method of blow-molding biaxially-oriented polyethylene terephthalate resin bottle-shaped container |
| US5562960A (en) * | 1984-02-15 | 1996-10-08 | Yoshino Kogyosho Co., Ltd. | Double-blown PET bottle shaped container having essentially no residual stress and superior heat resistance |
| JPS60189418A (en) * | 1984-03-09 | 1985-09-26 | Toyo Seikan Kaisha Ltd | Manufacture of heat resisting polyester bottle |
| JPH0767732B2 (en) * | 1985-08-01 | 1995-07-26 | 株式会社吉野工業所 | Biaxial stretch blow molding method |
| JPH0622860B2 (en) * | 1985-08-01 | 1994-03-30 | 株式会社吉野工業所 | Biaxial stretching blow molding method |
| FR2595294B1 (en) * | 1986-03-04 | 1988-07-08 | Sidel Sa | PROCESS AND PLANT FOR MANUFACTURING CONTAINERS, SUCH AS BOTTLES, OF POLYETHYLENETEREPHTHALATE, RESISTANT TO RELATIVELY SEVERED THERMAL CONDITIONS DURING THEIR USE |
| JPS62238730A (en) * | 1986-04-09 | 1987-10-19 | Toyo Seikan Kaisha Ltd | Manufacture of thermally fixed oriented container |
| JP2534482B2 (en) * | 1986-11-12 | 1996-09-18 | 北海製罐株式会社 | Method for producing polyethylene terephthalate resin bottle |
| US5352402A (en) * | 1989-10-23 | 1994-10-04 | Nissei Asb Machine Co., Ltd. | Method and apparatus for manufacturing biaxially oriented, thermally stable, blown containers |
| US5281387A (en) * | 1992-07-07 | 1994-01-25 | Continental Pet Technologies, Inc. | Method of forming a container having a low crystallinity |
| WO1994001269A1 (en) * | 1992-07-07 | 1994-01-20 | Continental Pet Technologies, Inc. | Method of forming container with high-crystallinity sidewall and low-clystallinity base |
| PL173243B1 (en) * | 1992-09-22 | 1998-02-27 | Pepsico Inc | Pre-form for blow moulding as well as blow-moulding method and apparatus |
| JP2777790B2 (en) * | 1996-06-24 | 1998-07-23 | 株式会社吉野工業所 | Biaxial stretch blow molding method |
| EP1253000B2 (en) | 1999-02-12 | 2008-08-27 | Toyo Seikan Kaisya, Ltd. | Polyester container and method of manufacturing the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3892829A (en) * | 1973-10-03 | 1975-07-01 | Owens Illinois Inc | Method of making blown plastic articles |
| JPS5153566A (en) * | 1974-09-24 | 1976-05-12 | Haustrup Plastic As | |
| JPS5471A (en) * | 1977-05-04 | 1979-01-05 | Rhone Poulenc Ind | Improved manufacture of twoooriented hollow body and twoooriented hollow body |
-
1980
- 1980-01-26 JP JP792880A patent/JPS56105935A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3892829A (en) * | 1973-10-03 | 1975-07-01 | Owens Illinois Inc | Method of making blown plastic articles |
| JPS5153566A (en) * | 1974-09-24 | 1976-05-12 | Haustrup Plastic As | |
| JPS5471A (en) * | 1977-05-04 | 1979-01-05 | Rhone Poulenc Ind | Improved manufacture of twoooriented hollow body and twoooriented hollow body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56105935A (en) | 1981-08-22 |
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