JPS6332608B2 - - Google Patents
Info
- Publication number
- JPS6332608B2 JPS6332608B2 JP61011732A JP1173286A JPS6332608B2 JP S6332608 B2 JPS6332608 B2 JP S6332608B2 JP 61011732 A JP61011732 A JP 61011732A JP 1173286 A JP1173286 A JP 1173286A JP S6332608 B2 JPS6332608 B2 JP S6332608B2
- Authority
- JP
- Japan
- Prior art keywords
- bottle
- mold
- temperature
- heat medium
- passage
- 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
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229920001225 polyester resin Polymers 0.000 claims description 10
- 239000004645 polyester resin Substances 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000009835 boiling Methods 0.000 claims description 5
- 238000007710 freezing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920002545 silicone oil Polymers 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 238000000071 blow moulding Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
-
- 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
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
- B29C2049/7864—Temperature of the mould
- B29C2049/78645—Temperature of the mould characterised by temperature values or ranges
-
- 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
- B29C49/6604—Thermal conditioning of the blown article
- B29C49/6605—Heating the article, e.g. for hot fill
-
- 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
- B29C49/6604—Thermal conditioning of the blown article
- B29C49/6605—Heating the article, e.g. for hot fill
- B29C49/66055—Heating the article, e.g. for hot fill using special pressurizing during the heating, e.g. in order to control the shrinking
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は二軸延伸して形成された飽和ポリエス
テル樹脂製壜の残留歪み減少方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reducing residual strain in a saturated polyester resin bottle formed by biaxial stretching.
溶剤等有害物の滲出がなく、かつ廃棄後の焼却
に際して有害ガスの発生がない等の利点から飽和
ポリエステル樹脂製壜が注目されているが、該壜
はその材質の機械的強度を増加させるために一般
に二軸延伸して成形されている。ところでこのよ
うに二軸延伸して成形された飽和ポリエステル樹
脂製壜は、他の合成樹脂製壜に比べて熱変形温度
が極めて低く、このため例えば食品を殺菌等の理
由で加熱充填すると熱変形して入目（容積）が減
少し正確な内容量の充填が不能となり、又壜外観
を損ねる欠点があつた。 Bottles made of saturated polyester resin are attracting attention because of their advantages such as no leaching of harmful substances such as solvents and no generation of harmful gases when incinerated after disposal. It is generally formed by biaxial stretching. By the way, saturated polyester resin bottles formed by biaxial stretching have an extremely low heat deformation temperature compared to other synthetic resin bottles, and therefore, when heated and filled for reasons such as sterilizing food products, heat deformation occurs. As a result, the contents (volume) were reduced, making it impossible to fill the contents accurately, and the appearance of the bottle was also impaired.
このような欠点を除去して壜の耐熱性を高める
ためには、壜成形用の金型表面温度を約100℃〜
150℃、一般的には110℃〜140℃程度に高める必
要があるが、反面このような温度とした金型内か
ら成形品を取出すと収縮により変形する。そこで
上記のように金型を加熱して成形品の熱固定を行
つた後、次いで金型温度を降下させた後に成形品
を取出すことが必要となる。 In order to eliminate these defects and increase the heat resistance of the bottle, the surface temperature of the mold for forming the bottle must be set at approximately 100°C.
It is necessary to raise the temperature to 150°C, generally about 110°C to 140°C, but on the other hand, if the molded product is taken out of the mold at such a temperature, it will deform due to shrinkage. Therefore, after heat-setting the molded article by heating the mold as described above, it is necessary to lower the temperature of the mold and then take out the molded article.
従来、上記金型加熱をヒータ等で行い、又金型
冷却は金型内に設けた通路内に冷却水を通すこと
で行う方法、又金型内に二つの通路を設けてお
き、その一方通路には加熱用の、又他方には冷却
用の、それぞれ異る熱媒体を通す方法が知られて
いるが、前者の方法では装置が大型化する外、両
者は共に金型内へ熱媒体が残ることとなるため金
型の温度変化が遅れると共に残つた熱媒体がその
温度を変えることでの熱損失があつた。更に後者
の場合は金型内に二つの通路を設けるために、一
つの通路を設ける場合に比べて通路断面積を大き
く設定することが出来ず、よつて金型の温度を急
速に変化させることが出来なかつた。 Conventionally, the above-mentioned mold heating was performed using a heater etc., and the mold cooling was performed by passing cooling water through a passage provided in the mold, or two passages were provided in the mold and one of them was A method is known in which different heat mediums are passed through the passages, one for heating and the other for cooling, but the former method increases the size of the device, and both methods pass heat medium into the mold. As a result, the temperature change of the mold was delayed, and the remaining heat medium changed its temperature, resulting in heat loss. Furthermore, in the latter case, since two passages are provided in the mold, the cross-sectional area of the passage cannot be set larger than when one passage is provided, and therefore the temperature of the mold may change rapidly. I couldn't do it.
本発明は、金型に設けた通路に沸点が約150℃
以上でかつ凝固点が０℃以下の熱媒体を、温度変
化させ通過させることで上記金型の加熱と冷却と
を行うようにしたものであり、このようにするこ
とで、金型加熱および冷却の装置を簡易化すると
共に加熱および冷却効果を高めて迅速に金型温度
を変化させ、もつて成形サイクルの向上が図れる
よう設けたものである。 In the present invention, the passage provided in the mold has a boiling point of approximately 150°C.
The above-mentioned mold is heated and cooled by changing the temperature and passing a heat medium having a freezing point of 0°C or less, and by doing this, the mold is heated and cooled. This device is designed to simplify the device and increase heating and cooling effects to quickly change mold temperature, thereby improving the molding cycle.
以下図面についても説明すると、１は二軸延伸
して形成された飽和ポリエステル樹脂製の壜で、
２は底壁、３は底壁周縁から起立させた胴部、４
はキヤツプ螺合用螺条５を有する口頚部で、該口
頚部の基部へはキヤツプ螺合時においてキヤツプ
下端面を圧接させるための外向きフランジ６が付
設されている。該壜は吹込み成形によりパリソン
を膨張させて形成させたものでもよく、又予め射
出成形によつて管状の中間成形品を設けておき、
これを吹込み成形したものでもよい。いずれにせ
よ、二軸延伸方向に延伸させて形成したものであ
る。 To explain the drawings below, 1 is a bottle made of saturated polyester resin formed by biaxial stretching,
2 is a bottom wall, 3 is a body part raised from the periphery of the bottom wall, 4
Reference numeral denotes a neck portion having a thread 5 for screwing the cap, and an outward flange 6 is attached to the base of the neck portion for press-contacting the lower end surface of the cap when the cap is screwed together. The bottle may be formed by expanding a parison by blow molding, or a tubular intermediate molded product may be provided in advance by injection molding.
This may also be blow molded. In any case, it is formed by stretching in the biaxial stretching direction.
壜成形後に後述の加熱を行い、これによつて壜
壁内部の残留歪みを減少して該壜の熱変形温度を
高めておく。 After the bottle is formed, it is heated as described below to reduce the residual strain inside the bottle wall and increase the heat distortion temperature of the bottle.
上記残留歪みの減少は下記方法によつて行う。 The above residual strain is reduced by the following method.
即ち第２図が示すように金型７を利用して金型
内に残留歪みを有する壜１ａを保持させ、壜内部
に収縮防止のため約５Kg／cm2程度の高圧気体を入
れておき、金型を介して壜を加熱して壜内部の残
留歪みを減少させ、熱変形温度を高めた後、金型
と共に壜を冷却させた後、壜を取出す。 That is, as shown in FIG. 2, a mold 7 is used to hold the bottle 1a with residual strain in the mold, and high-pressure gas of about 5 kg/cm 2 is filled inside the bottle to prevent shrinkage. After heating the bottle through a mold to reduce residual strain inside the bottle and increasing the heat distortion temperature, the bottle is cooled together with the mold, and then the bottle is taken out.
上記加熱および冷却は、金型内に穿設させた通
路８内に、シリコンオイル又はポリエチレングリ
コール等の、沸点が約150℃以上で凝固点が０℃
以下の熱媒体を通過させることで金型を加熱し、
又該熱媒体を冷却して該冷却された熱媒体通過に
より金型を冷却させる。 For the above heating and cooling, a material such as silicone oil or polyethylene glycol having a boiling point of about 150°C or more and a freezing point of 0°C is used in the passage 8 bored in the mold.
The mold is heated by passing the following heat medium,
Further, the heat medium is cooled and the mold is cooled by passing the cooled heat medium.
熱媒体通過のためには、金型通路８の入口端と
出口端とに、例えば高温熱媒体入りタンクと低温
熱媒体入りタンクとを有するパイプ両端を連結
し、金型加熱の際は低温熱媒体入りタンクのバル
ブを閉じたまま高温熱媒体入りタンクのバルブを
開いて通路８内へ高温熱媒体を通過させ、又金型
冷却の際は高温熱媒体入りタンクのバルブを閉じ
ておき、低温熱媒体入りタンクのバルブを開いて
通路８内に低温熱媒体を通過させればよい。 In order to pass the heat medium, for example, both ends of a pipe having a tank containing a high temperature heat medium and a tank containing a low temperature heat medium are connected to the inlet end and the outlet end of the mold passage 8, and when heating the mold, low temperature heat is passed through. While keeping the valve of the tank containing medium closed, open the valve of the tank containing high temperature heat medium to allow the high temperature heat medium to pass into the passage 8. Also, when cooling the mold, close the valve of the tank containing high temperature heat medium to The low-temperature heat medium may be passed into the passage 8 by opening the valve of the tank containing the heat medium.
実施例
(1) 160℃に加熱したエチレングリコール（沸点
197℃で凝固点−11.5℃）を通路８に通し加熱
したところ、金型表面温度は150℃となつた。Example (1) Ethylene glycol (boiling point
When the mold was passed through passage 8 and heated, the mold surface temperature reached 150°C.
この金型を使用して飽和ポリエステル樹脂製
壜（ポリエチレンテレフタレートI.V.値0.72）
の二軸延伸による吹込み成形を行い、その後20
秒間、金型内に保持して熱固定を行つた後、そ
のまま成形品を取出したところ、成形品は収縮
し、正常な形状が得られなかつた。 Use this mold to make saturated polyester resin bottles (polyethylene terephthalate IV value 0.72)
Blow molding is performed by biaxial stretching, and then 20
When the molded product was taken out after being held in the mold for a few seconds for heat fixation, the molded product shrank and could not obtain a normal shape.
(2) 上記20秒間の熱固定の後、０℃に冷却したエ
チレングリコールに切換えて10秒間冷却した
後、成形品を取出したところ、肩部および底部
に僅かに変形が認められたが、ほぼ正常な成形
品が得られた。(2) After heat fixing for 20 seconds, switch to ethylene glycol cooled to 0℃ and cool for 10 seconds. When the molded product was taken out, slight deformation was observed on the shoulders and bottom, but almost A normal molded product was obtained.
(3) 上記(2)と同様にして冷却時間を30秒にしたと
ころ、ヒケ、変形等のない完全な成形品が得ら
れた。このときの金型表面温度は73℃であつ
た。(3) When the cooling time was changed to 30 seconds in the same manner as in (2) above, a perfect molded product without sink marks, deformation, etc. was obtained. The mold surface temperature at this time was 73°C.
(4) 上記(3)の実施例で作成した1500ml入りの飽和
ポリエステル樹脂製の二軸延伸壜に93℃の熱湯
を満量充填し、常温で室温まで冷却した。(4) The 1500 ml biaxially stretched bottle made of saturated polyester resin prepared in Example (3) above was fully filled with 93°C hot water and cooled to room temperature.
このボトルを観察したところ、変形等の外観
変化はみられず、熱による容量変化も−0.37％
と少く、耐熱性にすぐれた飽和ポリエステル樹
脂樹脂製二軸延伸壜を作ることが出来た。 When this bottle was observed, there was no change in appearance such as deformation, and the capacity change due to heat was -0.37%.
We were able to make a biaxially stretched bottle made of saturated polyester resin with a small amount of heat resistance and excellent heat resistance.
本発明方法は上記のように行うものであり、従
つて金型加熱および冷却のための装置を小形化す
ることが出来ると共に、温度を異にする特定の熱
媒体が一つの金型内通路を交互に通過することで
金型温度が変化するよう設けたから、異る温度の
熱媒体は切換えられた温度の熱媒体によつて金型
外へ押出されることで金型温度を急速に変えるこ
とが出来、又金型内通路は一つでよいから、その
断面積を大として金型の受熱面積を大とすること
が出来、更に熱媒体は沸点が約150℃以上で凝固
点が０℃以下のものを使用するよう設けたから、
金型内を通過させる熱媒体の温度差を大きくする
ことが出来、よつて金型温度変化を急速に行うこ
とが出来るものである。このようにして二軸延伸
して形成された飽和ポリエステル樹脂製壜の残留
歪みを容易かつ確実に減少することが出来る。 The method of the present invention is carried out as described above, and therefore it is possible to downsize the device for heating and cooling the mold, and also allows specific heating mediums of different temperatures to pass through one passage in the mold. Since the temperature of the mold is changed by passing the heat medium alternately, the heat medium of different temperature is pushed out of the mold by the heat medium of the switched temperature, thereby rapidly changing the temperature of the mold. Since only one passage is required in the mold, the heat receiving area of the mold can be increased by increasing its cross-sectional area.Furthermore, the heating medium has a boiling point of approximately 150°C or higher and a freezing point of approximately 0°C or lower. Because I set it up to use the
It is possible to increase the temperature difference of the heat medium passed through the mold, and thus the mold temperature can be changed rapidly. In this way, the residual strain of the saturated polyester resin bottle formed by biaxial stretching can be easily and reliably reduced.
第１図は本発明に係る壜の断面図、第２図は本
発明方法を行う装置の断面図である。
１，１ａ……壜、７……金型、８……透孔、９
……ノズル付き金型。
FIG. 1 is a sectional view of a bottle according to the invention, and FIG. 2 is a sectional view of an apparatus for carrying out the method of the invention. 1, 1a...Bottle, 7...Mold, 8...Through hole, 9
...Mold with nozzle.
Claims (1)
脂製壜を通路付き金型内に抱持させ、上記壜内に
高圧気体を充填させた状態で、上記通路内をシリ
コンオイル又はポリエチレングリコール等の沸点
が約150℃以上で凝固点が０℃以下の特定熱媒体
通過による金型加熱により壜を加熱し、該壜壁内
部の残留歪みを減少して該壜の熱変形温度を高め
た後、上記通路内に、冷却させた上記熱媒体を通
過させることで金型と共に壜を冷却させ、壜を取
出すことを特徴とする飽和ポリエステル樹脂製壜
の残留歪み減少方法。1 A saturated polyester resin bottle formed by biaxial stretching is held in a mold with a passage, and while the bottle is filled with high-pressure gas, the passage is filled with silicone oil or polyethylene glycol at the boiling point. The bottle is heated by heating the mold by passing a specific heat medium having a temperature of about 150°C or higher and a freezing point of 0°C or lower, thereby reducing residual strain inside the bottle wall and increasing the heat distortion temperature of the bottle. A method for reducing residual strain in a saturated polyester resin bottle, which comprises cooling the bottle together with a mold by passing the cooled heat medium inside the bottle, and then taking out the bottle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61011732A JPS61171323A (en) | 1986-01-21 | 1986-01-21 | Reducing process of residual strain in saturated polyester resin bottle molded by biaxial orientation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61011732A JPS61171323A (en) | 1986-01-21 | 1986-01-21 | Reducing process of residual strain in saturated polyester resin bottle molded by biaxial orientation |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13381577A Division JPS5466968A (en) | 1977-11-08 | 1977-11-08 | Biaxially stretched and formed saturated polyester resin bottle and method of reducing residual strain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61171323A JPS61171323A (en) | 1986-08-02 |
| JPS6332608B2 true JPS6332608B2 (en) | 1988-06-30 |
Family
ID=11786202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61011732A Granted JPS61171323A (en) | 1986-01-21 | 1986-01-21 | Reducing process of residual strain in saturated polyester resin bottle molded by biaxial orientation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61171323A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52145428A (en) * | 1976-05-29 | 1977-12-03 | Shikoku Kaken Kogyo Kk | Method of applying inorganic heat insulating layer |
| JPS53264A (en) * | 1976-06-25 | 1978-01-05 | Teijin Ltd | Bottle made of polyester and method of producing same |
-
1986
- 1986-01-21 JP JP61011732A patent/JPS61171323A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52145428A (en) * | 1976-05-29 | 1977-12-03 | Shikoku Kaken Kogyo Kk | Method of applying inorganic heat insulating layer |
| JPS53264A (en) * | 1976-06-25 | 1978-01-05 | Teijin Ltd | Bottle made of polyester and method of producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61171323A (en) | 1986-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4572811A (en) | Method for producing polyester containers | |
| KR100474784B1 (en) | Manufacturing method of molded plastic container | |
| JP3062309B2 (en) | Biaxially stretchable synthetic resin piece for forming inner bottle, method for forming inner / outer double bottle, and inner / outer double bottle | |
| JPH0413216B2 (en) | ||
| AU631897B2 (en) | Process for the manufacture of containers made of polyethyleneterephthalate intended to be filled with a hot liquid | |
| JPS60171124A (en) | Process of biaxially oriented drawing blow molding | |
| JPS5892536A (en) | Biaxially stretched plastic bottle | |
| JP6911380B2 (en) | Manufacturing method of synthetic resin container and blow molding mold | |
| JPS6332608B2 (en) | ||
| JP6930263B2 (en) | Manufacturing method of polyester resin container and blow molding mold | |
| JPS6220013B2 (en) | ||
| JPS6149826A (en) | Biaxial orientation blow molding method | |
| JPH0422687B2 (en) | ||
| JPH01310933A (en) | Preparation of container made of synthetic resin | |
| JPH0622860B2 (en) | Biaxial stretching blow molding method | |
| JPH06297552A (en) | Manufacture of resin blow molding container and molding die | |
| GB2074932A (en) | Blow Molded Polyester Bottle | |
| JPH01127313A (en) | Manufacturing device for thermofixing plastic hollow vessel | |
| JPH0443498B2 (en) | ||
| JPH01133716A (en) | Manufacture of biaxial-oriented and heat-set vessel | |
| JPH0512219B2 (en) | ||
| JPS58177328A (en) | Method of composite molding of composite container of thermoplastic resin and paper | |
| JPS63202425A (en) | Manufacture of biaxially stretched polyester bottle | |
| JPH0235656B2 (en) | ||
| JPS6124169B2 (en) |