JPH021672B2 - - Google Patents
Info
- Publication number
- JPH021672B2 JPH021672B2 JP56104498A JP10449881A JPH021672B2 JP H021672 B2 JPH021672 B2 JP H021672B2 JP 56104498 A JP56104498 A JP 56104498A JP 10449881 A JP10449881 A JP 10449881A JP H021672 B2 JPH021672 B2 JP H021672B2
- Authority
- JP
- Japan
- Prior art keywords
- prepreg
- metal foil
- press
- foil
- copper
- 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 - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 36
- 239000011888 foil Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 13
- 229910001220 stainless steel Inorganic materials 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 12
- 239000011889 copper foil Substances 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 238000000465 moulding Methods 0.000 description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 5
- 239000000123 paper Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 239000002655 kraft paper Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000002470 thermal conductor Substances 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】
本発明は、プリント配線用基板などに用いられ
る金属箔張積層板の製造方法に関し、さらに詳し
くは片面金属箔張積層板の反りを改善する製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal foil-clad laminate used for printed wiring boards, and more particularly to a manufacturing method for improving warping of a single-sided metal foil-clad laminate.
近年、銅張積層板を基板として加工するプリン
ト配線板の製造工程では、自動化設備が普及し、
生産性が著しく向上している。このような自動化
の背景のもとで、基板である銅張積層板特に片面
銅張積層板に対して、寸法の安定性、特に反りに
ついて改善の要請が高まつてきた。 In recent years, automated equipment has become widespread in the manufacturing process of printed wiring boards, which processes copper-clad laminates as substrates.
Productivity has improved significantly. Against this backdrop of automation, there has been an increasing demand for improvements in dimensional stability, particularly with respect to warpage, for copper-clad laminates, particularly single-sided copper-clad laminates, which serve as substrates.
片面銅張積層板は、プリプレグの片面に銅箔を
重ねて１組としたものを成形一体化することによ
つて得られる。プリプレグは、紙等の基材にフエ
ノール樹脂等の熱硬化性樹脂を含浸乾燥したもの
で、このプリプレグと所望厚さに応じ数枚重ね、
さらにその片面に銅箔（必要に応じ接着剤付銅
箔）を重ねて素材の組としたものを成形一体化す
る。この成形一体化は、複数の上記各組をプレス
熱盤間に配置して成形し、各組を一体化する。こ
の方法は、各組がステンレス鏡面板にはさまれる
ように、素材の組とステンレス鏡面板を交互に重
ね、２枚のプレス熱盤間に配置し所定時間加熱加
圧成形して一体化したのち、ステンレス鏡面板か
ら取り出して片面銅張積層板が得られる。 A single-sided copper-clad laminate is obtained by integrally molding a set of prepregs with copper foil layered on one side. Prepreg is made by impregnating and drying a thermosetting resin such as phenolic resin into a base material such as paper, and stacks several sheets of this prepreg depending on the desired thickness.
Further, copper foil (copper foil with adhesive, if necessary) is layered on one side of the material to form a set of materials, which is then molded into one piece. In this molding and integration, the plurality of sets are placed between press hot platens and molded, and the sets are integrated. This method consists of stacking material sets and stainless steel mirror plates alternately so that each set is sandwiched between stainless steel mirror plates, placing them between two press plates, and heating and press-forming them for a predetermined period of time to integrate them. Afterwards, it is removed from the stainless steel mirror plate to obtain a single-sided copper-clad laminate.
この銅張積層板の成形説備も近年大型化し、プ
レスは10〜40段の熱盤を備える多段プレスで、一
組のプレス熱盤間には、10〜17の素材の組が配置
されて成形されるようになつた。しかも、成形さ
れる銅張積層板の面積が７m2に達するような大型
プレスも実用化されている。 The molding equipment for this copper-clad laminate has also become larger in recent years, and the press is a multi-stage press with 10 to 40 heating plates, and 10 to 17 sets of materials are arranged between one set of press heating plates. It began to be molded. Moreover, large-scale presses that can form copper-clad laminates with an area of up to 7 m 2 have also been put into practical use.
ところが、１組の熱盤間に成形される片面銅張
積層板の数が多い多量製造方式になればなる程、
熱伝導の遅速によつて、熱盤の隣りに配置成形さ
れる片面銅張積層板と熱盤間の中間で成形される
片面銅張積層板との間には、反りに差があり、そ
れらが混在したロツトは反りのバラツキが大き
い。このような片面銅張積層板の反りは、クツシ
ヨン材の選択、プリプレグの硬化度の管理、成形
条件の適正化等の対策をとつても、多量製造方式
においては、さして効果が現われず、自動化され
たプリント配線板製造には大きな問題となつてい
た。 However, as mass production methods increase in the number of single-sided copper-clad laminates that are formed between a set of hot platens,
Due to the slow rate of heat conduction, there is a difference in warpage between a single-sided copper-clad laminate that is placed and formed next to a hot plate and a single-sided copper-clad laminate that is formed in the middle between the hot plates. Lots with a mixture of warpages have large variations in warpage. Even if measures such as selecting the cushion material, controlling the degree of hardening of the prepreg, and optimizing the molding conditions are taken to prevent warping of single-sided copper-clad laminates, they are not very effective in mass production methods, and automation is not effective. This has become a major problem in the production of printed wiring boards.
本発明は、そのような片面金属箔張積層板の多
量製造方式において、プリプレグに対する金属箔
の配置を指定するものであり、反りの少ない寸法
安定性に優れた片面金属箔張積層板を得るために
なされたものである。 The present invention specifies the arrangement of metal foil with respect to the prepreg in such a mass production method of single-sided metal foil-clad laminates, and aims to obtain a single-sided metal foil-clad laminate with less warpage and excellent dimensional stability. This is what was done.
即ち、本発明は、プリプレグの片面に金属箔を
重ねて１組とし、その複数組を２枚のプレス熱盤
間に配置して成形し、上記各組を一体化するに際
し、上記複数組のうち少くともプレス熱盤の隣り
に配置する組について、その組に対してより距離
が近いプレス熱盤と反対の側のプリプレグ面に、
金属箔を重ねて成形することを特徴とする片面金
属箔張積層板の製造方法である。 That is, in the present invention, a metal foil is stacked on one side of a prepreg to form one set, and the plural sets are placed between two press hot plates and molded, and when each set is integrated, the plural sets are At least for the group placed next to the press heating plate, on the prepreg surface on the side opposite to the press heating plate which is closer to the group,
This is a method for manufacturing a single-sided metal foil-clad laminate, which is characterized by forming metal foils in layers.
次に、本発明の製造方法の詳細を、図面を参照
して説明する。 Next, details of the manufacturing method of the present invention will be explained with reference to the drawings.
第１図は、プレス成形する際のプリプレグと金
属箔との配置、プレス熱盤、付帯副資材などを、
多段プレスの１段分について示したものである。 Figure 1 shows the arrangement of prepreg and metal foil during press molding, press heating plate, incidental auxiliary materials, etc.
This shows one stage of a multi-stage press.
熱盤１，１′は多段プレスの熱盤のうちの２枚
の熱盤であり、上の熱盤に接するトツププレート
２と下の熱盤に接するキヤリヤープレート２′は
金属板で仕込み取出しのために通常用いられるも
のである。両プレートの次に置かれるクツシヨン
材３，３′はクラフト紙、アスベスト紙などで、
加圧を均一化する。14枚の片面金属箔張積層板を
成形するためのステンレス鏡面板４は15枚必要
で、最上位と最下位のステンレス鏡面板は１枚の
片面金属箔張積層板に、他のステンレス鏡面板は
表裏で２枚の片面金属箔張積層板に直接接して成
形する。 The heating plates 1 and 1' are two of the heating plates of a multi-stage press, and the top plate 2 in contact with the upper heating plate and the carrier plate 2' in contact with the lower heating plate are metal plates for loading and unloading. It is commonly used for The cushion materials 3 and 3' placed next to both plates are made of kraft paper, asbestos paper, etc.
Equalize pressure. In order to form 14 single-sided metal foil clad laminates, 15 stainless steel mirror plates 4 are required, and the top and bottom stainless steel mirror plates are one single-sided metal foil clad laminate, and the other stainless steel mirror plates is molded by directly contacting two single-sided metal foil-clad laminates on the front and back sides.
片面金属箔張積層板の素材は、プリプレグと金
属箔との組合せである。プリプレグ１１は、積層
板の所望厚さに応じて複数枚が用いられるが、図
面には一体として図示した。プリプレグ１１の基
材はガラス質、セルローズ質、合成繊維質の紙布
など、熱硬化性樹脂はフエノール樹脂、エポキシ
樹脂、ポリイミド樹脂などが例示でき、熱硬化性
樹脂積層板が得られる基材と樹脂とのあらゆる組
合せが適用できる。 The material of the single-sided metal foil-clad laminate is a combination of prepreg and metal foil. Although a plurality of prepregs 11 are used depending on the desired thickness of the laminate, they are shown as one piece in the drawing. Examples of the base material of the prepreg 11 include glass, cellulose, and synthetic fiber paper cloth, and examples of the thermosetting resin include phenol resin, epoxy resin, and polyimide resin. Any combination with resin is applicable.
金属箔１２は、銅箔、アルミ箔など導電体を構
成する金属箔、上記のほか銅合金箔など熱伝導体
を構成する金属箔等すべての金属箔が適用でき
る。プリント配線板として9μｍ、18μｍ、35μｍ、
70μｍなどの厚さの銅箔が多く用いられ、その金
属箔１２の接着性を高めるために表面処理、接着
剤塗布などがなされることが多い。 The metal foil 12 can be any metal foil such as copper foil, aluminum foil, or other metal foil that constitutes a conductor, and in addition to the above, copper alloy foil or other metal foil that constitutes a thermal conductor. 9μm, 18μm, 35μm, as printed wiring board
Copper foil with a thickness of 70 μm or the like is often used, and surface treatment, adhesive coating, etc. are often performed to improve the adhesiveness of the metal foil 12.
プリプレグ１１の片面にのみ金属箔１２を重ね
た片面金属箔張積層板は、バイメタル的効果にた
めに、本発明のプリプレグに対する金属箔の配置
をすることにより本発明の効果が発揮される。そ
の配置は第１図のNo.１〜１４の素材の組のうち、
少くともNo.１及び〓１４の組については、それぞ
れの金属箔１２をプリプレグ１１に対してより距
離が近いプレス熱盤と反対の側のプリプレグ面に
重ねなければならない。即ち、No.１の組について
金属箔１２はプレス熱盤１からより遠い側である
プリプレグ１１の下面に、No.１４の組について金
属箔１２はプレス熱盤１′からより遠い側である
プリプレグ１１の上面に重ねる。少くともNo.１と
No.１４の組について、上記のようにすれば、ロツ
トの反りのバラツキは著しく減少させることがで
きる。 A single-sided metal foil-clad laminate in which metal foil 12 is layered only on one side of prepreg 11 exhibits the effects of the present invention by arranging the metal foil on the prepreg of the present invention to achieve a bimetallic effect. The arrangement is among the material groups No. 1 to 14 in Figure 1.
At least for Nos. 1 and 14, each metal foil 12 must be placed on the prepreg surface on the side opposite to the press hot plate, which is closer to the prepreg 11. That is, for the No. 1 group, the metal foil 12 is placed on the lower surface of the prepreg 11 on the side farther from the press hot plate 1, and for the No. 14 group, the metal foil 12 is placed on the lower surface of the prepreg 11 on the side farther from the press hot plate 1'. Lay it on top of 11. At least No.1
With regard to the set No. 14, if the above procedure is performed, the variation in warpage of the rods can be significantly reduced.
次に好ましくは、No.１とNo.１４の組に加えてNo.
２とNo.１３の組についても、それぞれの金属箔１
２をプリプレグ１１に対してより距離が近いプレ
ス熱盤と反対の側のプリプレグ面に重ねれば反り
のバラツキはより少くなる。更に好ましくは、No.
１〜No.１４までのすべての組について、同様にす
るのがよく、このときの反りのバラツキはNo.１と
No.１４だけについて同様にしたロツトのバラツキ
に比較して約4/5になるものと認められた。 Next, preferably, in addition to the set of No. 1 and No. 14, No.
For pairs No. 2 and No. 13, each metal foil 1
2 on the prepreg surface on the side opposite to the press hot plate which is closer to the prepreg 11, the variation in warpage will be further reduced. More preferably, No.
It is best to do the same for all sets from No. 1 to No. 14, and the variation in warpage at this time is the same as No. 1.
It was recognized that the variation was about 4/5 compared to that of a similar lot for No. 14 only.
本発明によれば、片面金属箔張積層板の多量製
造方式において、プレス熱盤の隣りに配置され、
熱伝導が他の組と異る素材の組について、プリプ
レグに対する金属箔の配置を指定するという簡単
な手法によつて、反りのバラツキを実施例で説明
するように著減させることができた。 According to the present invention, in a mass production method for single-sided metal foil-clad laminates, the
For a set of materials whose thermal conductivity is different from that of other sets, by a simple method of specifying the arrangement of the metal foil with respect to the prepreg, it was possible to significantly reduce the variation in warpage as explained in the examples.
以下に片面銅張フエノール樹脂積層板の実施例
について説明するが、本発明はこの実施例によつ
て限定されるものではない。 An example of a single-sided copper-clad phenolic resin laminate will be described below, but the present invention is not limited to this example.
実施例 １
油変性フエノール樹脂系コツトンリンター紙基
材プリプレグ８枚と接着剤付35μｍ厚さの銅箔と
の組をプレス熱盤間に次のように配置した。Example 1 A set of eight sheets of oil-modified phenolic resin cotton linter paper base prepreg and adhesive-coated copper foil with a thickness of 35 μm was arranged between press hot plates as follows.
熱盤１′の上にキヤリヤープレート２′を置き、
その上にクラフト紙のクツシヨン材料３′を置き、
更にその上にステンレス鏡面板４を置く。このス
テンレス鏡面板４の上に８枚のプリプレグを置
き、その上に接着剤付銅箔（接着剤面をプリプレ
グ側にする）を配置して次のステンレス鏡面板を
置く。これで１組（No.１４）分のプリプレグと銅
箔の組合せが完了する。この組の銅箔は熱盤１′
と反対の側のプリプレグ面に配置されたことにな
る。 Place the carrier plate 2' on the heating plate 1',
Place the kraft paper cushion material 3' on top of it.
Furthermore, a stainless steel mirror plate 4 is placed on top of it. Eight prepregs are placed on this stainless steel mirror plate 4, adhesive-coated copper foil (with the adhesive side facing the prepreg) is placed thereon, and the next stainless steel mirror plate is placed. This completes the combination of prepreg and copper foil for one set (No. 14). This set of copper foil is hot plate 1'
It is placed on the prepreg surface on the opposite side.
次にNo.１３〜No.２の組については、No.１４と同
様にステンレス鏡面板の上に８枚のプリプレグを
置き、その上に接着剤付銅箔（接着剤面をプリプ
レグ側にする）を配置して次のステンレス鏡面板
を置く。次にNo.１の組については、ステンレス鏡
面板の上に接着剤付銅箔（接着剤面を上側にす
る）と置き、その上に８枚のプリプレグを配置し
て最後のステンレス鏡面板を置く。このようにす
ると、No.１の組とNo.１４の組、即ちプレス熱盤の
隣りに配置した組について、銅箔はそれぞれのプ
リプレグに対してより距離が近いプレス熱盤と反
対の側のプリプレグ面に配置され、他の組につい
ては必ずしもそのように規則的に配置されていな
い。しかるのち、クラフト紙のクツシヨン材料３
を置き、その上にトツププレート２を置き、１段
分の成形組合せが完了する。 Next, for sets No. 13 to No. 2, place 8 prepregs on a stainless steel mirror plate in the same way as No. 14, and place adhesive-coated copper foil (with the adhesive side on the prepreg side) on top. ) and place the next stainless steel mirror plate. Next, for the No. 1 set, place adhesive-coated copper foil (adhesive side up) on top of the stainless steel mirror plate, place eight prepregs on top of it, and attach the last stainless steel mirror plate. put. In this way, for the groups No. 1 and No. 14, that is, the groups placed next to the press heat plate, the copper foil is placed on the side opposite to the press heat plate, which is closer to each prepreg. They are arranged on the prepreg surface, and the other sets are not necessarily arranged so regularly. After that, kraft paper cushion material 3
and place the top plate 2 on top of it, completing the molding combination for one stage.
このようにして30段分準備した後、175℃、120
Kg／cm2、170分の成形条件で成形して、1.6mm厚の
片面銅張フエノール樹脂積層板を得た。この板の
定尺（１ｍ×１ｍ）の反りをJIS C6481により測
定し、ロツトの反りの分布を第２図に示した。 After preparing 30 stages in this way, 175℃, 120℃
It was molded under the molding conditions of Kg/cm 2 and 170 minutes to obtain a single-sided copper-clad phenolic resin laminate with a thickness of 1.6 mm. The warpage of this board at a fixed length (1 m x 1 m) was measured according to JIS C6481, and the distribution of the warp of the rods is shown in Figure 2.
比較例 １
実施例１において、No.１の組合せもNo.１４〜No.
２の組合せと同様にして、従来方式の組合せと
し、実施例１と同様に成形し、反りを測定して、
ロツトの反りの分布を第３図に示した。Comparative Example 1 In Example 1, the combination No. 1 is also the combination No. 14 to No.
In the same manner as the combination of 2, the conventional method was used, molded in the same manner as in Example 1, and the warpage was measured.
Figure 3 shows the distribution of warpage of the rod.
実施例１の反りの分布を比較例のそれと比較し
てみると、著しく大きな反りの分布の山がなくな
つているのがわかる。 When the warpage distribution of Example 1 is compared with that of the comparative example, it can be seen that the extremely large peaks in the warp distribution have disappeared.
第１図は本発明の製造方法によるプレス熱盤間
の配置図、第２図は本発明の製造方法による片面
銅張フエノール樹脂積層板の反り分布グラフ、第
３図は従来例の同様な反り分布グラフである。
１，１′……プレス熱盤、１１……プリプレグ、
１２……金属箔、No.１〜No.１４……プリプレグに
金属箔を重ねた組の番号。
Fig. 1 is a layout diagram between press hot platens produced by the production method of the present invention, Fig. 2 is a warpage distribution graph of a single-sided copper-clad phenolic resin laminate produced by the production method of the present invention, and Fig. 3 is a similar warpage of a conventional example. This is a distribution graph. 1,1'...Press hot plate, 11...Prepreg,
12...Metal foil, No. 1 to No. 14... Number of the group in which metal foil is layered on prepreg.
Claims (1)
し、その複数組を２枚のプレス熱盤間に配置して
成形し、上記各組を一体化するに際し、上記複数
組のうち少くともプレス熱盤の隣りに配置する組
について、その組に対してより距離が近いプレス
熱盤と反対の側のプリプレグ面に、金属箔を重ね
て成形することを特徴とする片面金属箔張積層板
の製造方法。 ２ 複数組のすべてについて、その組に対してよ
り距離が近いプレス熱盤と反対の側のプリプレグ
面に、それぞれの組の金属箔を重ねて成形する特
許請求の範囲第１項記載の片面金属箔張積層板の
製造方法。[Scope of Claims] 1. Metal foil is stacked on one side of prepreg to form one set, and the plural sets are placed between two press hot plates and molded, and when each of the above sets is integrated, the above plural sets are A single-sided metal characterized in that, for at least the group placed next to the press hot plate, a metal foil is layered and formed on the prepreg surface on the side opposite to the press hot plate that is closer to the group. Method for manufacturing foil-clad laminates. 2. The single-sided metal according to claim 1, in which, for all of the plurality of sets, the metal foil of each set is overlaid and formed on the prepreg surface on the side opposite to the press heating plate which is closer to the set. Method for manufacturing foil-clad laminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56104498A JPS587348A (en) | 1981-07-06 | 1981-07-06 | Manufacture of metallic foil lined laminated board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56104498A JPS587348A (en) | 1981-07-06 | 1981-07-06 | Manufacture of metallic foil lined laminated board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS587348A JPS587348A (en) | 1983-01-17 |
| JPH021672B2 true JPH021672B2 (en) | 1990-01-12 |
Family
ID=14382179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56104498A Granted JPS587348A (en) | 1981-07-06 | 1981-07-06 | Manufacture of metallic foil lined laminated board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS587348A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62501914A (en) * | 1985-01-23 | 1987-07-30 | ザ ジレツト カンパニ− | Ballpoint pen writing instrument containing a water-based ink composition |
| JP2561985B2 (en) * | 1991-11-11 | 1996-12-11 | 川崎製鉄株式会社 | Pipe cleaning coating machine |
-
1981
- 1981-07-06 JP JP56104498A patent/JPS587348A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS587348A (en) | 1983-01-17 |
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