JPH0252612B2 - - Google Patents
Info
- Publication number
- JPH0252612B2 JPH0252612B2 JP1213782A JP1213782A JPH0252612B2 JP H0252612 B2 JPH0252612 B2 JP H0252612B2 JP 1213782 A JP1213782 A JP 1213782A JP 1213782 A JP1213782 A JP 1213782A JP H0252612 B2 JPH0252612 B2 JP H0252612B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- core material
- reinforced resin
- fibrous reinforcing
- 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.)
- Expired
Links
- 229920005989 resin Polymers 0.000 claims description 61
- 239000011347 resin Substances 0.000 claims description 61
- 239000011162 core material Substances 0.000 claims description 38
- 239000012779 reinforcing material Substances 0.000 claims description 26
- 239000012778 molding material Substances 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 14
- 229920001187 thermosetting polymer Polymers 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 7
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000009787 hand lay-up Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920006337 unsaturated polyester resin Polymers 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- -1 accelerators Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002562 thickening agent 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、繊維強化樹脂成形物の製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a fiber-reinforced resin molded article.
〔従来の技術〕
従来より、ハンドレイアツプ成形法やレジンイ
ンゼクシヨン成形法等により繊維強化樹脂成形物
を製造することが行われている。[Prior Art] Conventionally, fiber-reinforced resin molded products have been manufactured by hand lay-up molding, resin injection molding, and the like.
しかし繊維強化樹脂成形物が内部に芯材を有す
るような場合、繊維強化樹脂成形物が屋外で使用
されていると夜・昼の冷熱サイクルが繰返される
ために、線膨張係数の異なる芯材と繊維強化樹脂
層とが剥離し、繊維強化樹脂層にクリープを生じ
て表面に突出し外観を損なうことがあつた。 However, when a fiber-reinforced resin molded product has a core material inside, when the fiber-reinforced resin molded product is used outdoors, the heating and cooling cycles of night and day are repeated, so the core material has a different coefficient of linear expansion. The fiber-reinforced resin layer peeled off, and the fiber-reinforced resin layer sometimes caused creep and protruded to the surface, impairing its appearance.
そこで芯材と繊維強化樹脂層との剥離を防ぐた
め、表面に溝を凹設するか、或いは透孔を穿設し
た芯材上に繊維強化樹脂層を積層することが行わ
れいる。 In order to prevent the core material from peeling off from the fiber-reinforced resin layer, a fiber-reinforced resin layer is laminated on the core material, which has grooves formed on its surface or holes formed therein.
しかしながら、上記従来の方法で製造した場
合、溝又は透孔部の上方の繊維強化樹脂層に収縮
によるひけが生じ外観が損なわれたり、品質の低
下を来すことがあつた。
However, when manufactured by the above-mentioned conventional method, shrinkage occurs in the fiber-reinforced resin layer above the grooves or through-holes, which may impair the appearance or deteriorate the quality.
本発明は、上記従来の製造方法における欠点を
解消することを目的とするものであり、その要旨
は、内部に芯材を有する繊維強化樹脂成形物を成
形するに際し、成形用型上に繊維質補強材を敷設
し、その上に少なくとも一方の表面に直径0.7乃
至1.5mm、深さ１乃至２mmの複数の小孔を所定間
隔をおいて穿設した独立気泡の硬質合成樹脂発泡
体からなる芯材を設置し、その芯材を含む成形型
上に更に繊維質補強材を敷設し、芯材を繊維質補
強材中に内在させ、前記繊維質補強材を前記芯材
及び成形用型に沿わせるように賦形し、前記繊維
質補強材は、熱硬化性樹脂を予め含浸せしめる
か、あるいは賦形後に含浸せしめるかして繊維強
化樹脂成形材料とし、硬化することを特徴とする
繊維強化樹脂成形物の製造方法に存する。
The purpose of the present invention is to eliminate the drawbacks of the conventional manufacturing methods described above, and the gist thereof is that when molding a fiber-reinforced resin molded product having a core material inside, a fiber-reinforced resin molded product is placed on a mold. A core made of closed-cell hard synthetic resin foam, on which a reinforcing material is laid, and on at least one surface of the reinforcing material, multiple small holes with a diameter of 0.7 to 1.5 mm and a depth of 1 to 2 mm are bored at predetermined intervals. A fibrous reinforcing material is placed on the mold containing the core material, the core material is embedded in the fibrous reinforcing material, and the fibrous reinforcing material is placed along the core material and the molding mold. The fibrous reinforcing material is impregnated with a thermosetting resin in advance or impregnated after shaping to form a fiber-reinforced resin molding material, and the fiber-reinforced resin is cured. It consists in the manufacturing method of molded products.
表面に直径0.7乃至1.5mm、深さ１乃至２mmの複
数の小孔を所定間隔をおいて穿設している独立気
泡の硬質合成樹脂発泡体からなる芯材を繊維質補
強材に内在させ、芯材及び成形用型に沿わせるよ
うに賦形し、繊維質補強材には予め熱硬化性樹脂
を含浸せしめるか、あるいは賦形後に含浸せしめ
るかして繊維強化樹脂成形材料とし、硬化してい
るので、複数の小孔のみに熱硬化性樹脂が侵入硬
化され、芯材と繊維強化樹脂層とが強固に接着さ
れるので、軽量であり、且つ冷熱サイクルが繰返
されても繊維強化樹脂層とが剥離するのを防止す
ると共に、収縮によるひけを生じることがなく、
外観が損なわれたり、品質が低下したりすること
のない繊維強化樹脂成形物を製造することができ
る。
A core material made of closed-cell hard synthetic resin foam having a plurality of small holes with a diameter of 0.7 to 1.5 mm and a depth of 1 to 2 mm bored at predetermined intervals on the surface is embedded in the fibrous reinforcing material, The material is shaped to fit the core material and the mold, and the fiber reinforced material is either impregnated with a thermosetting resin in advance or impregnated after shaping to form a fiber-reinforced resin molding material, and then cured. Since the thermosetting resin penetrates only into the plurality of small holes and hardens, the core material and the fiber reinforced resin layer are firmly bonded, so it is lightweight and the fiber reinforced resin layer remains strong even after repeated cooling and heating cycles. In addition to preventing peeling off, there is no shrinkage caused by shrinkage.
It is possible to produce a fiber-reinforced resin molded product without deteriorating its appearance or deteriorating its quality.
次に、本発明繊維強化樹脂成形物の製造方法に
ついて更に詳細に説明する。
Next, the method for manufacturing the fiber-reinforced resin molded article of the present invention will be explained in more detail.
繊維強化樹脂成形成形材料は、不飽和ポリエス
テル樹脂、エポキシ樹脂、ジアリルフタレート樹
脂等の熱硬化性樹脂に必要に応じて硬化剤、促進
剤、増粘剤等を添加したものを、ガラス繊維、合
成繊維等の繊維質補強材に含侵させたものであ
る。 Fiber-reinforced resin molding materials are thermosetting resins such as unsaturated polyester resins, epoxy resins, diallyl phthalate resins, etc., with curing agents, accelerators, thickeners, etc. It is impregnated into a fibrous reinforcing material such as fiber.
芯材は、ウレタン樹脂発泡体、アクリル樹脂発
泡体等の気泡径0.3mm以下の独立気泡の硬質合成
樹脂発泡体からなるものが使用され、一方の表面
には直径0.7乃至1.5mm、深さ１乃至２mmの複数の
小孔が２乃至４mm程度の間隔をおいて形成してあ
る。 The core material used is a closed-cell hard synthetic resin foam such as urethane resin foam or acrylic resin foam with a cell diameter of 0.3 mm or less, and one surface has a core material with a diameter of 0.7 to 1.5 mm and a depth of 1. A plurality of small holes of 2 mm to 2 mm are formed at intervals of about 2 to 4 mm.
小孔の密度としては１cm2当たり６乃至15個程度
とされているのが好適である。 The density of the small holes is preferably about 6 to 15 per cm 2 .
繊維強化樹脂成形物の成形には、例えばレジン
インゼクシヨン成形法、ハンドレイアツプ成形法
を適用することができる。 For example, a resin injection molding method or a hand lay-up molding method can be applied to mold the fiber-reinforced resin molded product.
図面によりレジンインゼクシヨン成形法におけ
る成形例を示す。 The drawings show examples of molding in the resin injection molding method.
１，２は閉合、開割できる成形用型であり、成
形用型１及び２には厚肉部を形成する型部分３，
３′がそれぞれ設けてある。 1 and 2 are molding molds that can be closed and opened; the molding molds 1 and 2 have mold parts 3,
3' are provided respectively.
４は芯材であつて、その一方の表面には複数の
小孔４１……が所定間隔をおいて穿設してある。 4 is a core material, on one surface of which a plurality of small holes 41 are bored at predetermined intervals.
レジンインゼクシヨン成形法により成形する場
合には、まず成形型１，２を開き繊維質補強材５
を成形型２の型面に沿つて敷設し（第１図）、成
形型２の厚肉部を形成する型部分３の上方の繊維
質補強材５上に芯材４を、製品完成時日照方向と
なる側に小孔４１が穿設した面を向けて設置し
（第２図）、成形型２及び芯材４上に更に繊維質補
強材５′を敷設する（第３図）。 When molding is performed using the resin injection molding method, first, the molds 1 and 2 are opened and the fibrous reinforcing material 5 is molded.
The core material 4 is laid along the mold surface of the mold 2 (Fig. 1), and the core material 4 is placed on the fibrous reinforcing material 5 above the mold part 3 that forms the thick part of the mold 2. It is installed with the surface in which the small holes 41 are formed facing the direction (FIG. 2), and a fibrous reinforcing material 5' is further laid on the mold 2 and the core material 4 (FIG. 3).
次いで成形型１，２を閉じ、樹脂注入口６から
熱硬化性樹脂を注入する（第４図）。 Next, the molds 1 and 2 are closed, and a thermosetting resin is injected from the resin injection port 6 (FIG. 4).
成形型１，２を閉じることにより、繊維質補強
材５，５′は必然的に芯材４表面に沿うように賦
形され、熱硬化性樹脂を注入することにより、繊
維質補強材５，５′に熱硬化性樹脂が含侵され繊
維補強樹脂成形材料７となる。 By closing the molds 1, 2, the fibrous reinforcing materials 5, 5' are inevitably shaped to follow the surface of the core material 4, and by injecting the thermosetting resin, the fibrous reinforcing materials 5, 5'5' is impregnated with a thermosetting resin to form a fiber-reinforced resin molding material 7.
しかる後に、型温を上昇させるか又は常温で繊
維強化樹脂成形材料７を硬化させる。 Thereafter, the mold temperature is raised or the fiber-reinforced resin molding material 7 is cured at room temperature.
ハンドレイアツプ成形法により成形する場合に
は、まず繊維質補強材に熱硬化性樹脂を含侵せし
めて予め繊維強化樹脂成形材料としておき、この
繊維強化樹脂成形材料を型面上に敷設し、脱泡ロ
ールにて型面に押圧し、型面よ沿うように賦形す
ると共に、繊維強化樹脂成形材料内の気泡を除
き、次いで成形型の厚肉部を形成する型部分の上
方の繊維強化樹脂成形材料上に芯材４を製品完成
時日照方向となる側に小孔４１を穿設した面を向
けて設置し、成形型及び芯材４上に更に繊維強化
樹脂成形材料を該芯材４を敷設し、再び脱泡ロー
ルで芯材及び型面に沿つて押圧し、気泡を除くと
共に、芯材４表面に沿うように賦形し、その後に
繊維強化樹脂成形材料を硬化する。 When molding is performed using the hand lay-up molding method, the fiber reinforced resin molding material is first impregnated with a thermosetting resin to form a fiber-reinforced resin molding material, and this fiber-reinforced resin molding material is laid on the mold surface. It is pressed against the mold surface with a defoaming roll to shape it along the mold surface, remove air bubbles in the fiber reinforced resin molding material, and then strengthen the fibers above the mold part that forms the thick part of the mold. The core material 4 is placed on the resin molding material with the side with the small holes 41 facing toward the sunlight direction when the product is completed, and the fiber-reinforced resin molding material is further placed on the mold and the core material 4. 4 is laid and pressed again along the core material and mold surface with a defoaming roll to remove air bubbles and shape the core material 4 along the surface, and then the fiber-reinforced resin molding material is cured.
実施例
型面上に厚さ３mmのガラス繊維からなる補強材
を敷設し、その上に比重０，２、気泡径０，１mm
の独立気泡の硬質ウレタン樹脂発泡体よりなる芯
材の一方の表面に、針の長さ５mmの歯車を10枚、
一本の軸に軸着した治具を回動させ直径１mm、深
さ１，５mmの小孔を１cm210個の割合で穿設した芯
材を型面上に敷設された補強材上に設置した後、
同一厚さのガラス繊維からなる補強材を成形型及
び芯材の上敷設し、成形用型を閉じて賦形し、樹
脂注入口より不飽和ポリエステル樹脂を注入し
て、ガラス繊維からなる補強材に不飽和ポリエス
テル樹脂を含侵させて繊維強化樹脂成形材料と
し、硬化せて繊維強化樹脂成形品を製造した。Example: A reinforcing material made of glass fiber with a thickness of 3 mm is laid on the mold surface, and on top of it a reinforcing material made of glass fiber with a specific gravity of 0.2 and a bubble diameter of 0.1 mm.
10 gears with a needle length of 5 mm are placed on one surface of the core material made of closed-cell hard urethane resin foam.
By rotating a jig attached to a single shaft, small holes with a diameter of 1 mm and a depth of 1.5 mm were drilled at a ratio of 1 cm2 to 10 core materials, and the core material was placed on the reinforcing material laid on the mold surface. After installing,
A reinforcing material made of glass fiber of the same thickness is laid on the mold and core material, the mold is closed and shaped, and unsaturated polyester resin is injected from the resin injection port to form the reinforcing material made of glass fiber. A fiber-reinforced resin molding material was obtained by impregnating unsaturated polyester resin into the resin, and the fiber-reinforced resin molding material was cured to produce a fiber-reinforced resin molded product.
本繊維強化樹脂成形物は表面に収縮によるひけ
はなく外観が良好で、しかも80℃の熱風により15
時間加熱し、次に−30℃で５時間冷却し、更に90
℃の熱風で５時間加熱した後においても外観に異
常は認められなかつた。 This fiber-reinforced resin molded product has a good appearance with no shrinkage marks on the surface.
Heated for 5 hours, then cooled at -30℃ for 5 hours, and then heated for 90℃.
No abnormality was observed in the appearance even after heating with hot air at ℃ for 5 hours.
本実施例では製品完成時日照方向となる側のみ
小孔を穿設したものを示したが、これに限定され
るものではなく二面もしくは全面に小孔を穿設し
たものであつてもよい。 In this example, small holes are drilled only on the side facing the sunlight direction when the product is completed, but the invention is not limited to this, and small holes may be drilled on two sides or the entire surface. .
ようは強固な接着強度を必要とする部分に小孔
を穿設すればよいのである。 In this case, small holes may be made in areas that require strong adhesive strength.
本発明は、上述の構成となされているので、冷
熱サイクルが繰り返されても繊維強化樹脂層と芯
材とが剥離して表面に突起が生じたり、収縮によ
るひけが生じたりすることのなく、且つ軽量な繊
維強化樹脂成形物を製造することができる。
Since the present invention has the above-mentioned configuration, even if the heating and cooling cycles are repeated, the fiber reinforced resin layer and the core material will not peel off and cause protrusions on the surface or sink marks due to shrinkage. Moreover, a lightweight fiber-reinforced resin molded product can be manufactured.
図面は本発明繊維強化樹脂成形物を製造工程の
一例を示すものであり、第１図は成形用型に繊維
質補強材を敷設した状態の縦断面図、第２図は繊
維質補強材上に芯材を設置した状態の縦断面図、
第３図は芯材上に更に繊維質補強材を設置した状
態の縦断面図、第４図は熱硬化性樹脂を注入し賦
形する状態の縦断面図である。
符号の説明、１，２：成形用型、３，３′：厚
肉部を形成する型部分、４：芯材、５，５′：繊
維質補強材、６：樹脂注入口、７：繊維強化樹脂
成形材料、４１：小孔。
The drawings show an example of the manufacturing process of the fiber-reinforced resin molded product of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the fibrous reinforcing material laid on the mold, and FIG. A vertical cross-sectional view of the state in which the core material is installed,
FIG. 3 is a longitudinal sectional view of a state in which a fibrous reinforcing material is further installed on the core material, and FIG. 4 is a longitudinal sectional view of a state in which a thermosetting resin is injected and shaped. Explanation of symbols, 1, 2: Molding mold, 3, 3': Mold part forming thick part, 4: Core material, 5, 5': Fibrous reinforcement material, 6: Resin injection port, 7: Fiber Reinforced resin molding material, 41: Small hole.
Claims (1)
形するに際し、成形用型上に繊維質補強材を敷設
し、その上に少なくとも一方の表面に直径0.7乃
至1.5mm、深さ１乃至２mmの複数の小孔を所定間
隔をおいて穿設した独立気泡の硬質合成樹脂発泡
体からなる芯材を設置し、その芯材を含む成形型
上に更に繊維質補強材を敷設し、芯材を繊維質補
強材中に内在させ、前記繊維質補強材を前記芯材
及び成形用型に沿わせるように賦形し、前記繊維
質補強材は、熱硬化性樹脂を予め含浸させるか、
あるいは賦形後に含浸させるかして繊維強化樹脂
成形材料とし、硬化することを特徴とする繊維強
化樹脂成形物の製造方法。 ２ 芯材の気泡径が0.3mm以下である特許請求の
範囲第１項に記載の繊維強化樹脂成形物の製造方
法。 ３ 芯材の同一平面上に形成した小孔の間隔が２
乃至４mmである特許請求の範囲第１項又は第２項
に記載の繊維強化樹脂成形物の製造方法。[Scope of Claims] 1. When molding a fiber-reinforced resin molded product having a core material inside, a fibrous reinforcing material is laid on a molding mold, and a fibrous reinforcing material with a diameter of 0.7 to 1.5 mm and a depth of 0.7 to 1.5 mm is placed on at least one surface of the mold. A core material made of closed-cell hard synthetic resin foam with multiple small holes of 1 to 2 mm in diameter drilled at predetermined intervals is installed, and a fibrous reinforcing material is further laid on the mold containing the core material. The core material is incorporated into the fibrous reinforcing material, the fibrous reinforcing material is shaped so as to fit along the core material and the molding die, and the fibrous reinforcing material is pre-impregnated with a thermosetting resin. Do you want me to do it?
Alternatively, a method for producing a fiber-reinforced resin molded product, which comprises impregnating it after shaping to obtain a fiber-reinforced resin molding material and curing it. 2. The method for producing a fiber-reinforced resin molded product according to claim 1, wherein the core material has a cell diameter of 0.3 mm or less. 3 The interval between small holes formed on the same plane of the core material is 2
A method for producing a fiber-reinforced resin molded article according to claim 1 or 2, which has a thickness of 4 mm to 4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1213782A JPS58128834A (en) | 1982-01-27 | 1982-01-27 | Manufacture of molded item |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1213782A JPS58128834A (en) | 1982-01-27 | 1982-01-27 | Manufacture of molded item |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58128834A JPS58128834A (en) | 1983-08-01 |
| JPH0252612B2 true JPH0252612B2 (en) | 1990-11-14 |
Family
ID=11797120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1213782A Granted JPS58128834A (en) | 1982-01-27 | 1982-01-27 | Manufacture of molded item |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58128834A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5023456A (en) * | 1973-07-02 | 1975-03-13 | ||
| JPS5223434A (en) * | 1975-08-15 | 1977-02-22 | Nippon Gakki Seizo Kk | Ski manufacturing pross |
| JPS6031358Y2 (en) * | 1977-08-10 | 1985-09-19 | ヤマハ株式会社 | MC type pick-up cartridge |
| JPS5491570A (en) * | 1977-12-29 | 1979-07-20 | Okayama Sekisui Kogyo Kk | Method of molding fiber reinforced plastics moldings |
| JPS54118470A (en) * | 1978-03-07 | 1979-09-13 | Cho Shirushi Plastic Kogyo | Multilayer molding of plastics |
-
1982
- 1982-01-27 JP JP1213782A patent/JPS58128834A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58128834A (en) | 1983-08-01 |
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