JPS6227654B2 - - Google Patents
Info
- Publication number
- JPS6227654B2 JPS6227654B2 JP56162301A JP16230181A JPS6227654B2 JP S6227654 B2 JPS6227654 B2 JP S6227654B2 JP 56162301 A JP56162301 A JP 56162301A JP 16230181 A JP16230181 A JP 16230181A JP S6227654 B2 JPS6227654 B2 JP S6227654B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- skin material
- mold
- female mold
- skin
- 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
- 239000000463 material Substances 0.000 claims description 60
- 229920003002 synthetic resin Polymers 0.000 claims description 34
- 239000000057 synthetic resin Substances 0.000 claims description 34
- 239000006260 foam Substances 0.000 claims description 25
- 229920001169 thermoplastic Polymers 0.000 claims description 12
- 239000004416 thermosoftening plastic Substances 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000007666 vacuum forming Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002904 solvent 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
- B29C44/146—Shaping the lining before foaming
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
Description
【発明の詳細な説明】
本発明は熱可塑性合成樹脂シートを含む表皮材
と軟質合成樹脂発泡体からなるクツシヨン材との
積層体であつて、表皮材側の表面に凹凸模様を付
形した表皮付きクツシヨン材の製造方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is a laminate of a skin material including a thermoplastic synthetic resin sheet and a cushion material made of a soft synthetic resin foam, the skin material having an uneven pattern formed on the surface of the skin material side. The present invention relates to a method for producing a cushion material.
従来この種のクツシヨン材を製造する方法とし
ては、たとえば特開昭55−105559号公報に示され
ているように、表皮材と軟質合成樹脂発泡体をあ
らかじめ接着しておき、軟質合成樹脂発泡体の加
熱プレス変形性を利用して、適宜凹模様状に形成
した雄型で加熱プレス成形し、表面に凹凸模様を
付形する方法があつた。しかしながらこの方法に
よると凹凸模様をシヤープに形成できない欠点が
あり、また熱可塑性合成樹脂シートからなる表皮
材上に高温に加熱した雄型が当接し、加熱加圧さ
れることになるので表皮材表面の絞模様が流れて
しまう欠点もあり、このため絞模様と同様の模様
を雄型の表面に設けて行なつていたが、模様合せ
が困難であつたり、表皮材の絞模様に合せて数多
くの雄型を用意しなければならないなどの技術
上、コスト上の欠点があつた。 Conventionally, as shown in Japanese Patent Application Laid-Open No. 55-105559, a method for manufacturing this type of cushion material is to bond a skin material and a soft synthetic resin foam in advance, and There is a method of hot press molding using a male die formed into an appropriately concave pattern to form an uneven pattern on the surface by utilizing the heat press deformability of the material. However, this method has the disadvantage that it is not possible to form a sharp uneven pattern, and also because the male die heated to a high temperature comes into contact with the skin material made of a thermoplastic synthetic resin sheet and is heated and pressurized. There is also the drawback that the shibori pattern of the wafer may run, and for this reason, a pattern similar to the shibori pattern was created on the surface of the male die, but it was difficult to match the pattern, and there were many cases where it was difficult to match the pattern, and there were many cases where it was difficult to match the pattern. There were technical and cost disadvantages, such as the need to prepare a male mold.
また表皮材の気密性、熱可塑性を利用して表皮
材とクツシヨン材を貼り合せた積層シートを凹凸
模様を形成した真空成形用雌型によつて加熱真空
吸引成形することも行なわれたが、この方法によ
るを表皮材の裏面に貼着したクツシヨン材の弾力
性のために復元しようとする力がかかり浅い凹凸
模様や小さい凹凸模様などは明瞭に付形すること
ができなかつた。 In addition, by utilizing the airtightness and thermoplasticity of the skin material, a laminated sheet made by bonding the skin material and the cushion material was formed by heating and vacuum suction molding using a female mold for vacuum forming with an uneven pattern. When using this method, the elasticity of the cushion material attached to the back surface of the skin material exerts a force to restore the material, making it impossible to clearly form shallow uneven patterns or small uneven patterns.
本発明はこのような従来の方法の欠点を解決
し、表面の凹凸模様を明瞭に、しかも容易に付形
することができる表皮付きクツシヨン材の製造方
法を提供することを目的としたものである。 The object of the present invention is to solve the drawbacks of the conventional methods and provide a method for producing a cushion material with a skin, which allows the uneven pattern on the surface to be clearly and easily shaped. .
すなわち本発明は、熱可塑性合成樹脂シートを
含む表皮材と、軟質または半硬質合成樹脂発泡体
との各々の表面またはどちらか一方の表面に接着
剤を塗布して接着剤面側を重合した積層シート
を、内面に凹凸模様を付形した真空成形用雌型と
雄型間に表皮材面を雌型側に向けて載置し、雌型
によつて真空吸引成形を行ない、かつ雌型と雄型
で加熱プレス成形することによつて表皮材と軟質
合成樹脂発泡体を一体に成形することを特徴とす
る表面に凹凸模様を付形した表皮付きクツシヨン
材の製造方法ある。 That is, the present invention provides a laminate in which an adhesive is applied to each or either surface of a skin material containing a thermoplastic synthetic resin sheet and a soft or semi-hard synthetic resin foam, and the adhesive side is polymerized. The sheet is placed between a female mold for vacuum forming with an uneven pattern on the inner surface and a male mold, with the skin surface facing toward the female mold, vacuum suction molding is performed by the female mold, and There is a method for producing a cushion material with a skin having an uneven pattern on its surface, which is characterized by integrally molding the skin material and a soft synthetic resin foam by hot press molding with a male mold.
図面実施例に基づいて説明をする。 Explanation will be given based on drawing examples.
第１図は本発明によつて得られたクツシヨン材
の斜視図、第２図は第１図Ａ−Ａ線の断面図、第
３図は製造方法を示す説明図である。本発明にお
いてはまず第３図イに示すように、クツシヨン材
の表面に付形すべき凹凸模様と同一の凹凸形状１
１を内面に付形した真空成形用雌型８及び加熱プ
レス用雄型７を用意する。クツシヨン材の素材と
しては熱可塑性合成樹脂シートを含む表皮材３
と、軟質合成樹脂発泡体６である。熱可塑性合成
樹脂シートを含む表皮材３は熱可塑性合成樹脂シ
ート単独あるいは熱可塑性合成樹脂シートと伸縮
性を有する生布を貼り合せたいわゆる合成樹脂レ
ザーが使用できる。合成樹脂レザーは合成樹脂面
を表側として使用することも、生布面側を表側と
して使用することもどちらでもできる。熱可塑性
合成樹脂シートはすべての熱可塑性合成樹脂から
なるシート状物が使用できる。代表的なものはポ
リ塩化ビニル樹脂、アクリル樹脂、ポリウレタン
樹脂、ポリエチレン樹脂などである。軟質合成樹
脂発泡体６はポリウレタンフオーム、ポリ塩化ビ
ニルフオーム、ポリエチレンフオームなどでクツ
シヨン性を有し、加熱プレス変形性を有するもの
である。使用する発泡体の厚さは雌型の深さによ
り適宜選択することができるが５〜50ｍ／ｍが適
当である。この表皮材３と軟質合成樹脂発泡体６
とを積層するに際し、接着剤を使用するものであ
るが、接着剤は表皮材３側に塗布しておいてもよ
いし、軟質合成樹脂発泡体６側でも良いしあるい
は両方に塗布しても良い。接着剤はエマルジヨン
タイプ、溶剤タイプ、ホツトメルトタイプのもの
が適し、接着剤を塗布して単に重合積層しただけ
では接着一体化しないものである。 FIG. 1 is a perspective view of a cushion material obtained by the present invention, FIG. 2 is a cross-sectional view taken along line A--A in FIG. 1, and FIG. 3 is an explanatory view showing the manufacturing method. In the present invention, first, as shown in FIG.
A female mold 8 for vacuum forming and a male mold 7 for hot pressing, each having a shape formed on the inner surface thereof, are prepared. The material for the cushion material is a skin material 3 containing a thermoplastic synthetic resin sheet.
and a soft synthetic resin foam 6. As the skin material 3 containing a thermoplastic synthetic resin sheet, a thermoplastic synthetic resin sheet alone or a so-called synthetic resin leather made by laminating a thermoplastic synthetic resin sheet and a stretchable raw cloth can be used. For synthetic resin leather, the synthetic resin side can be used as the front side, or the raw cloth side can be used as the front side. The thermoplastic synthetic resin sheet can be a sheet made of any thermoplastic synthetic resin. Typical examples include polyvinyl chloride resin, acrylic resin, polyurethane resin, and polyethylene resin. The soft synthetic resin foam 6 is made of polyurethane foam, polyvinyl chloride foam, polyethylene foam, etc., and has cushioning properties and heat press deformability. The thickness of the foam used can be appropriately selected depending on the depth of the female mold, but is suitably 5 to 50 m/m. This skin material 3 and soft synthetic resin foam 6
An adhesive is used to laminate the two, but the adhesive may be applied to the skin material 3 side, the soft synthetic resin foam 6 side, or both. good. Suitable adhesives are emulsion type, solvent type, and hot melt type, and cannot be integrated by simply applying the adhesive and polymerizing and laminating the adhesive.
表皮材３と軟質合成樹脂発泡体６を雌型８上に
重合積層して載置し雄型７でプレス圧着すると同
時に吸引孔１０から吸気し、表皮材３を真空成形
する。このとき、雄型７のプレス面が平面状であ
るときは雄型７と雌型８とでプレス成形する際に
表皮材３と軟質合成樹脂発泡体６が雄型７のプレ
ス面と雌型８のエツジ９によつて挾着固定される
ので、表皮材３の真空吸引成形は良好に行なわれ
る。雄型７のプレス面に凸状がある場合には表皮
材３が雌型８の凹部内に押し込まれるので、何ら
かの公知の手段で表皮材３を雌型８のフランジ部
１１に固定しておく必要がある。表皮材３は第３
図ロに示すように雌型８の型面どおりに容易に成
形され、軟質合成樹脂発泡体６も所定形状に加熱
プレス成形される。この際雌型８は熱可塑性合成
樹脂シートの軟化点以下で、50〜170℃に加熱し
ておき、雄型７は150〜230℃に加熱しておき、プ
レス時間は１分〜10分である。又、吸引は20秒以
上行なえば充分である。 The skin material 3 and the soft synthetic resin foam 6 are laminated and placed on a female die 8, and are press-bonded with a male mold 7, and at the same time air is sucked through the suction hole 10 to vacuum form the skin material 3. At this time, when the press surface of the male die 7 is flat, the skin material 3 and the soft synthetic resin foam 6 are formed between the press surface of the male die 7 and the female die when press molding is performed between the male die 7 and the female die 8. Since the skin material 3 is clamped and fixed by the edges 9 of the skin material 3, the vacuum suction molding of the skin material 3 is performed well. If the pressing surface of the male mold 7 has a convex shape, the skin material 3 will be pushed into the recess of the female mold 8, so the skin material 3 is fixed to the flange portion 11 of the female mold 8 by some known means. There is a need. The skin material 3 is the third
As shown in Figure B, it is easily molded according to the mold surface of the female mold 8, and the soft synthetic resin foam 6 is also heated and press-molded into a predetermined shape. At this time, the female mold 8 is heated to 50 to 170°C below the softening point of the thermoplastic synthetic resin sheet, the male mold 7 is heated to 150 to 230°C, and the pressing time is 1 to 10 minutes. be. Also, it is sufficient to perform suction for 20 seconds or more.
かくして第３図ロに示すように軟質合成樹脂発
泡体６は表皮材３の裏面の形状にそつた形状にに
変形し、その形状を保つたまゝ同時に表皮材３と
一体に接着される。また必要な場合において、軟
質合成樹脂発泡体６の裏面に布材などの補強材を
設けることは自由であり、このような場合には加
熱プレス成形時に同時に接着することができる。
なおこの実施例の場合雄型７は表面が平面状であ
るが、必要に応じて凹凸形状のものを使用するこ
ともでき、このような雄型７を使用した場合は軟
質合成樹脂発泡体６の裏面には雄型７の凹凸形状
に応じた凹凸形状が形成される。型から脱型する
と第１図、第２図に示すクツシヨン材１が得られ
る。表皮材３は側面部４から表面部にわたつて発
泡体６を被覆し、表面部においては凹部２を明瞭
に形成している。クツシヨン材１の底周辺部５は
雄型７と雌型８のエツジ９によつて緊密に圧縮成
形される。又、エツジ９を設けずに雄型７と雌型
８のフランジ部１１に適宜スペースを設け圧縮成
形しても良い。 Thus, as shown in FIG. 3B, the soft synthetic resin foam 6 is deformed into a shape that conforms to the shape of the back surface of the skin material 3, and is simultaneously adhered to the skin material 3 while maintaining that shape. Further, if necessary, a reinforcing material such as a cloth material may be freely provided on the back surface of the soft synthetic resin foam 6, and in such a case, it can be bonded at the same time during hot press molding.
In this embodiment, the male mold 7 has a planar surface, but it is also possible to use a surface with an uneven surface if necessary. When such a male mold 7 is used, the soft synthetic resin foam 6 An uneven shape corresponding to the uneven shape of the male die 7 is formed on the back surface of the mold. When the mold is removed, the cushion material 1 shown in FIGS. 1 and 2 is obtained. The skin material 3 covers the foam 6 from the side surface portion 4 to the surface portion, and the recess 2 is clearly formed in the surface portion. The bottom periphery 5 of the cushion material 1 is tightly compression molded by the edges 9 of the male mold 7 and female mold 8. Alternatively, compression molding may be performed by providing an appropriate space between the flange portions 11 of the male mold 7 and female mold 8 without providing the edges 9.
本発明によると表皮材３は熱可塑性合成樹脂シ
ートを含むものであるから容易に真空成形するこ
とができ、成形型の内面に形成した凹凸形状通り
に明瞭に凹凸形状が付形された表皮材となる。同
時に真空成形により表皮材が比較的低温で容易に
付形されるため絞模様が明瞭に残る。 According to the present invention, since the skin material 3 includes a thermoplastic synthetic resin sheet, it can be easily vacuum-formed, and the skin material 3 is formed with a clear uneven shape that matches the uneven shape formed on the inner surface of the mold. . At the same time, vacuum forming allows the skin material to be easily shaped at a relatively low temperature, leaving a clear drawing pattern.
軟質合成樹脂発泡体６は加熱プレス変形性を有
するから、これを表皮材３の裏側に載置し、雄型
７と雌型８により加熱プレスすると容易に凹凸形
状が付形される。同時に表皮材３と発泡体６は加
熱圧着されるから接着剤も活性化され、硬化して
強固に接着一体化される。 Since the soft synthetic resin foam 6 has heat press deformability, when it is placed on the back side of the skin material 3 and heated and pressed using the male die 7 and the female die 8, an uneven shape is easily formed. At the same time, the skin material 3 and the foam body 6 are bonded under heat and pressure, so that the adhesive is also activated and hardened to be firmly bonded and integrated.
以上のように本発明によると真空成形と加熱プ
レス成形の併用により凹凸模様が明瞭に付形され
た表皮付きクツシヨン材がきわめて容易に得られ
るものであり、特に浅い凹部模様や小さい凹部模
様などを形成させるのに好適である。また本発明
では表皮材と発泡体をあらかじめ接着しておく必
要はないので積層工程が省略でき製造能率も向上
する。また軟質合成樹脂発泡体６は圧縮されたま
ま保形されるので、平均密度が高くなり、弾力性
も向上するのでクツシヨン材として高弾力性のも
のが得られる。 As described above, according to the present invention, a skin-covered cushion material in which a concave-convex pattern is clearly formed can be obtained very easily by combining vacuum forming and hot press forming. suitable for forming. Further, in the present invention, since it is not necessary to bond the skin material and the foam in advance, the lamination process can be omitted and manufacturing efficiency can be improved. Further, since the soft synthetic resin foam 6 retains its shape while being compressed, its average density is increased and its elasticity is improved, so that a cushion material with high elasticity can be obtained.
本発明によつて得られるクツシヨン材はこのま
ま車輛用や家具用のクツシヨン材として使用する
ことができるが、他のクツシヨン材の表面に取り
付けるクツシヨン性装飾表面材たとえば内装用装
飾クツシヨンとしても使用でき、その高い装飾性
とクツシヨン性により用途は広いものである。 The cushion material obtained by the present invention can be used as it is as a cushion material for vehicles or furniture, but it can also be used as a cushion decorative surface material that is attached to the surface of other cushion materials, such as a decorative cushion for interior decoration. It has a wide range of uses due to its high decorative and cushioning properties.
第１図は本発明によつて得られたクツシヨン材
実施例の斜視図、第２図は第１図Ａ−Ａ線の断面
図、第３図は製造方法を示す説明図である。
１……クツシヨン材、２……凹部模様、３……
表皮材、６……軟質合成樹脂発泡体、７……雄
型、８……真空成形用雌型。
FIG. 1 is a perspective view of an embodiment of the cushion material obtained by the present invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is an explanatory view showing the manufacturing method. 1...Cushion material, 2...Concave pattern, 3...
Skin material, 6... Soft synthetic resin foam, 7... Male mold, 8... Female mold for vacuum forming.
Claims (1)
質または半硬質合成樹脂発泡体との各々の表面ま
たは、どちらか一方の表面に接着剤を塗布して接
着剤面側を重合した積層シートを、内面に凹凸模
様を付形した真空成形用雌型と雄型間に表皮材面
を雌型側に向けて載置し、雌型によつて真空吸引
成形を行ない、かつ雌型と雄型で加熱プレス成形
することによつて表皮材と軟質合成樹脂発泡体を
一体に成形することを特徴とする表面に凹凸模様
を付形した表皮付きクツシヨン材の製造方法。1. A laminated sheet in which an adhesive is applied to each surface of a skin material containing a thermoplastic synthetic resin sheet and a soft or semi-hard synthetic resin foam, or to either one of the surfaces and the adhesive side is polymerized, The skin material surface is placed between the female mold and the male mold, which have an uneven pattern on the inner surface, with the surface facing toward the female mold, vacuum suction molding is performed by the female mold, and the female mold and the male mold are A method for manufacturing a cushion material with a skin having an uneven pattern on its surface, characterized by integrally molding a skin material and a soft synthetic resin foam by hot press molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56162301A JPS5862028A (en) | 1981-10-12 | 1981-10-12 | Manufacture of cushion material with skin that has uneven design on surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56162301A JPS5862028A (en) | 1981-10-12 | 1981-10-12 | Manufacture of cushion material with skin that has uneven design on surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5862028A JPS5862028A (en) | 1983-04-13 |
| JPS6227654B2 true JPS6227654B2 (en) | 1987-06-16 |
Family
ID=15751892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56162301A Granted JPS5862028A (en) | 1981-10-12 | 1981-10-12 | Manufacture of cushion material with skin that has uneven design on surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5862028A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02107229A (en) * | 1988-10-15 | 1990-04-19 | Inax Corp | Electrode |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61241126A (en) * | 1985-04-18 | 1986-10-27 | Daihatsu Motor Co Ltd | Manufacture of part |
| JP2895841B2 (en) * | 1988-12-27 | 1999-05-24 | 住友化学工業株式会社 | Method for producing synthetic resin laminate having skin material and mold for molding synthetic resin used in this method |
| BE1004623A3 (en) * | 1990-11-19 | 1992-12-22 | Recticel | Method for manufacturing of a cushion at least formed by a body, an intermediate foam layer and a covering layer. |
| JP5931552B2 (en) * | 2012-04-10 | 2016-06-08 | 株式会社イノアックコーポレーション | Vehicle interior member and manufacturing method thereof |
-
1981
- 1981-10-12 JP JP56162301A patent/JPS5862028A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02107229A (en) * | 1988-10-15 | 1990-04-19 | Inax Corp | Electrode |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5862028A (en) | 1983-04-13 |
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