JPH0335094B2 - - Google Patents
Info
- Publication number
- JPH0335094B2 JPH0335094B2 JP60173735A JP17373585A JPH0335094B2 JP H0335094 B2 JPH0335094 B2 JP H0335094B2 JP 60173735 A JP60173735 A JP 60173735A JP 17373585 A JP17373585 A JP 17373585A JP H0335094 B2 JPH0335094 B2 JP H0335094B2
- Authority
- JP
- Japan
- Prior art keywords
- insert
- resin
- opening
- mold
- peripheral wall
- 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
- 229920005989 resin Polymers 0.000 claims description 25
- 239000011347 resin Substances 0.000 claims description 25
- 238000005187 foaming Methods 0.000 claims description 24
- 239000006260 foam Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 21
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 7
- 210000003491 skin Anatomy 0.000 description 11
- 239000000243 solution Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 6
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 5
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000008258 liquid foam Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic 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
- B29C44/34—Auxiliary operations
- B29C44/35—Component parts; Details or accessories
- B29C44/351—Means for preventing foam to leak out from the foaming device during foaming
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は発泡成形品の製造方法、詳しくは自動
車内装品であるインストルメントパネルパツド、
コンソールボツクス、ドアトリム等の合成樹脂製
のインサートと合成樹脂表皮体の間に介在された
発泡体からなる製品であつて、特に不必要な開口
部をもつたインサートを使用する場合の成形方法
であり、発泡成形体時における発泡原液のもれを
防止した発泡成形品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 manufacturing a foam molded product, specifically an instrument panel pad, which is an automobile interior part.
This is a molding method for products made of foam interposed between a synthetic resin insert and a synthetic resin skin, such as console boxes and door trims, especially when inserts with unnecessary openings are used. , relates to a method for producing a foamed molded product that prevents leakage of a foaming stock solution during the foamed molded product.
（従来技術）
ポリプロピレン、ABSあるいはガラス短繊維
を充填した樹脂製インサートは自動車内装品であ
るインストルメントパネルパツド、コンソールボ
ツクス等に使用されているが、該インサートは射
出成形によつて成形される場合が多い。この場
合、上記インサートの形状は非常に複雑で湾曲し
た部分、開口部を有する部分、凹凸を有する部分
が多数あり、必要に応じて金型からの抜き角度の
関係から本来必要でない開口部を設けなければな
らない。(Prior art) Resin inserts filled with polypropylene, ABS, or short glass fibers are used in automobile interior parts such as instrument panel pads and console boxes, but these inserts are molded by injection molding. There are many cases. In this case, the shape of the insert is very complex and has many curved parts, parts with openings, and parts with unevenness, and if necessary, openings that are not originally required are created due to the angle of extraction from the mold. There must be.
このため、これを裏打ちインサートとして発泡
成形品を製造する場合、塩化ビニル、ABS樹脂
からなる肉厚の小さい表皮材を下型に、そして上
記インサートを上型に設置した後、この２つの部
材で形成された空間にウレタンフオーム等の発泡
原液を注入硬化して発泡成形品を製造する方法が
一般に採用されている。この際、上記インサート
にテープの可撓性材料等を貼る方法あるいは鉄板
等の金属材料を接着材によつて固定する方法も提
案されている。 Therefore, when manufacturing a foam molded product using this as a backing insert, a thin skin material made of vinyl chloride and ABS resin is installed in the lower mold, and the above insert is installed in the upper mold, and then these two members are A commonly used method is to inject a foaming solution such as urethane foam into the formed space and harden it to produce a foamed molded product. At this time, a method of attaching a flexible material such as a tape to the insert or a method of fixing a metal material such as an iron plate with an adhesive has also been proposed.
（発明が解決しようとする問題点）
上記インサートの不必要開口部を閉鎖しない
と、発泡原液が開口部から漏れ、その部分のウレ
タンフオームの密度が低下して表面硬度において
他の部分との差が生じ、また収縮量の関係から表
皮表面の平滑性が損なわれる大きな欠点がある。
そのため、可撓性材料によりインサートの不必要
開口部を閉鎖すると、該開口部の大きさが約10mm
角以上になると可撓性材料が上下金型の空間部の
側へたわみ、その後、ウレタンフオーム注入後の
大きな発泡圧によつて上記可撓性材料とインサー
トの開口部分の界面間へウレタンフオームが侵入
して外部へ漏れる問題があつた。(Problem to be Solved by the Invention) If the unnecessary openings of the insert are not closed, the foaming solution will leak from the openings, and the density of the urethane foam in that area will decrease, resulting in a difference in surface hardness from other areas. This also has the major drawback that the smoothness of the epidermis surface is impaired due to the amount of shrinkage.
Therefore, if the unnecessary opening of the insert is closed with a flexible material, the size of the opening will be approximately 10 mm.
When the angle is exceeded, the flexible material bends toward the space between the upper and lower molds, and then, due to the large foaming pressure after the urethane foam is injected, the urethane foam is pushed between the interface between the flexible material and the opening of the insert. There was a problem of intrusion and leakage to the outside.
一方、金属性材料を用いて不必要な開口部を閉
鎖する方法では接着剤を使用しなければ、やはり
発泡原液が漏れることがあつた。接着剤を使用す
ることは極めて効率の悪い作業である。 On the other hand, in the method of closing unnecessary openings using a metallic material, the foaming solution sometimes leaked unless an adhesive was used. Using adhesives is a very inefficient operation.
本発明は、上述の如き実状に対処し、インサー
トの不必要な開口部を効率よく閉鎖して発泡原液
の漏れを防止して表皮表面の平滑性を保持してな
る発泡成形品の製造方法を提供することを目的と
する。 The present invention addresses the above-mentioned circumstances and provides a method for manufacturing a foam molded product, which efficiently closes unnecessary openings in the insert to prevent leakage of the foaming solution and maintain the smoothness of the skin surface. The purpose is to provide.
（問題点を解決するための手段）
即ち、本発明の特徴とするところは、樹脂製イ
ンサートと表皮間に発泡層を有する発泡成形品の
製造方法において、上記樹脂製インサートの不必
要な開口部に周壁を形成し、該周壁に硬質発泡樹
脂のブロツク体を挿入して上記開口部を閉鎖して
なる樹脂製インサートを一方のモールドに設置
し、他方のモールドに表皮を置いた後、発泡液を
注入して前記樹脂製インサートと表皮間に発泡層
を形成してなる発泡成形品の製造方法にある。(Means for Solving the Problems) That is, the present invention is characterized in that, in a method for manufacturing a foam molded product having a foam layer between a resin insert and a skin, unnecessary openings of the resin insert are removed. A resin insert is formed by forming a peripheral wall on the peripheral wall, inserting a hard foam resin block into the peripheral wall to close the opening, and placing the skin on the other mold. The present invention provides a method for producing a foamed molded product, which comprises injecting the resin insert to form a foamed layer between the resin insert and the skin.
（作 用）
本発明は、樹脂製インサートが本来不必要であ
る開口部に発泡樹脂のブロツク体を挿入して開口
部を閉鎖した状態であり、これを上下どちらか一
方の金型面に接触させた状態で発泡成形を行う
と、上記ブロツク体は発泡圧によつて金型表面に
強く当接して、これによつて発泡液が金型空間か
ら外部へ漏れることがない。(Function) The present invention is a state in which a foamed resin block is inserted into an opening where a resin insert is originally unnecessary, the opening is closed, and this is brought into contact with either the upper or lower mold surface. When foam molding is performed in this state, the block body strongly contacts the mold surface due to the foaming pressure, thereby preventing the foaming liquid from leaking from the mold space to the outside.
特に、本発明の発泡成形品の製造方法は不必要
な開口部に周壁が設けられ、この周壁の中にブロ
ツク体が挿入されているので、発泡工程中にブロ
ツク体が安定し、発泡液の漏れを完全に遮断す
る。これを今少し詳細に説明すると、モールド内
に発泡液を注入すると発泡液は発泡し、体積が膨
張して次第にモールド内に充満していく。 In particular, in the method for manufacturing a foamed molded product of the present invention, a peripheral wall is provided in an unnecessary opening, and a block body is inserted into this peripheral wall, so that the block body is stabilized during the foaming process and the foaming liquid is Completely block leaks. To explain this in a little more detail, when the foaming liquid is injected into the mold, the foaming liquid foams, expands in volume, and gradually fills the mold.
この発泡液の充満は、モールドの底面から一様
にせり上がつて行くのではなくモールドのいずれ
か一方から他方へ向かつて流れるように充満して
行く。 The foaming liquid does not uniformly rise from the bottom of the mold, but instead flows from one side of the mold to the other.
そのため、ブロツク体は発泡液が充満する過程
においては正面からのみでなく側面からも大きな
力を受ける。ここで、ブロツク体を単に開口部へ
挿入したのみの構成とするとブロツク体は発泡液
から側面方向に圧力を受けて傾き、ブロツク体と
開口部の間に隙間が出来て発泡原料が漏れ出てし
まう。これに対して、本発明はブロツク体はイン
サートの開口部に形成した周壁の中に挿入され、
単に開穴部に挿入した場合に比べて大きな表面積
をもつて強力にインサートに接しており、発泡原
液から受ける側圧によつても決してブロツク体が
傾くことがない。 Therefore, during the process of filling the block with the foaming liquid, it is subjected to large forces not only from the front but also from the sides. If the block body is simply inserted into the opening, the block body will receive pressure from the foaming liquid in the lateral direction and tilt, creating a gap between the block body and the opening, causing the foaming raw material to leak out. Put it away. In contrast, in the present invention, the block body is inserted into the peripheral wall formed in the opening of the insert,
It has a larger surface area than when simply inserted into an opening, and is in strong contact with the insert, and the block never tilts even when subjected to lateral pressure from the foaming solution.
また、更にブロツク体はインサートに設けられ
た周壁に挿入されているため、単にインサートの
開穴に挿入された場合に比べてブロツク体自体の
発泡原液と接触する体積自体が極めて小さい。そ
のため、ブロツク体が受ける側圧は非常に小さく
ブロツク体の発泡過程における傾きは更に防止さ
れる。加えて、単に開穴部にブロツク体を挿入し
た場合、開口部とブロツク体は線接触となるのに
対し周壁内に挿入することにより、これを面接触
することが可能となりシート性を大幅に向上させ
ることができる。 Further, since the block body is inserted into the peripheral wall provided in the insert, the volume of the block body itself that comes into contact with the foaming solution is extremely small compared to the case where the block body is simply inserted into the opening of the insert. Therefore, the lateral pressure that the block body receives is very small, and tilting of the block body during the foaming process is further prevented. In addition, if the block is simply inserted into the hole, the opening and the block will be in line contact, but by inserting it into the peripheral wall, it is possible to make surface contact, which greatly improves the sheeting properties. can be improved.
（実施例）
以下、添付図面を参照し、本発明方法の具体的
な実施例を説明する。(Example) Hereinafter, specific examples of the method of the present invention will be described with reference to the accompanying drawings.
第１図は本発明方法によつて得られたインスト
ルメントパネルパツドの斜視図、第２図は第１図
のＡ−Ａ断面図、第３図は本発明の製造工程を示
す説明図であり、前記発泡成形品であるインスト
ルメントパネルパツド１は、表面にポリ塩化ビニ
ル（PVC）、ABS樹脂あるいはPVCと発泡PVC、
ABSと発泡PP、ABSと発泡PE等の複合シート
等の熱可塑性合成樹脂を素材とする厚さ0.5〜5.0
mm程度の表皮２と、ポリウレタン等の発泡層２そ
してABS、ポリプロピレン、ナイロン等の樹脂
製インサート４の３層構造からなつており、その
外形としてオーデイオ、速度メータ等の取付けの
ための種々の必要な開口部５が設けられ、また一
方第２図に示されるように上記樹脂製インサート
４には局部的に本体から突出した周壁６をもつ本
来不必要な開口部７が設けられ、この開口部７に
は発泡樹脂のブロツク体８が嵌入されている。 FIG. 1 is a perspective view of an instrument panel pad obtained by the method of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is an explanatory diagram showing the manufacturing process of the present invention. The instrument panel pad 1, which is a foam molded product, has a surface made of polyvinyl chloride (PVC), ABS resin, or PVC and foamed PVC.
Thickness 0.5 to 5.0 made of thermoplastic synthetic resin such as ABS and foamed PP, ABS and foamed PE composite sheets, etc.
It consists of a three-layer structure: a skin 2 of approximately 1.0 mm in diameter, a foam layer 2 made of polyurethane, etc., and a resin insert 4 made of ABS, polypropylene, nylon, etc., and its external shape accommodates various needs for mounting audio, speedometers, etc. On the other hand, as shown in FIG. 2, the resin insert 4 is provided with an otherwise unnecessary opening 7 having a peripheral wall 6 locally protruding from the main body. A block body 8 made of foamed resin is fitted into the block 7.
本発明は上記の如き製品の機能上本来不必要で
ある開口部７をもつ樹脂製インサートを構成部品
とする発泡成形品の製造方法であるが、まず下モ
ールド９に真空成形又はスラツシユ成形によつて
得られた表皮２を装着し、そして上モールド１０
に不必要な開口部７をもつ樹脂製インサート４を
設置する。この場合、突出した周壁６をもつ開口
部７に、該周壁６の高さとほぼ同一かわずかに大
きい硬質発泡樹脂のブロツク体８を挿入して開口
部７を閉鎖し、該ブロツク体の一方の表面が上モ
ールド１０の表面に接する状態とし、他方の面が
周壁６の先端と同一になるように設置される。上
記周壁６を設けたのは開口部７を補強するためで
ある。上記ブロツク体８が樹脂製インサート４の
表面に設けられた周壁より突出すると発泡層の厚
みが小さくなり表面硬度に差が生じるため好まし
くない。次いで、下モールド９に設置した表皮２
の裏面にポリウレタン等の発泡原液を注入した
後、型締めして、発泡原液を硬化させて発泡層３
を形成する。 The present invention is a method for manufacturing a foam molded product having a resin insert as a component having an opening 7 which is essentially unnecessary for the function of the product as described above. The obtained skin 2 is attached, and the upper mold 10 is attached.
A resin insert 4 having an unnecessary opening 7 is installed in the hole. In this case, a hard foamed resin block 8 that is approximately the same height or slightly larger than the peripheral wall 6 is inserted into the opening 7 having the protruding peripheral wall 6, and the opening 7 is closed. It is installed so that its surface is in contact with the surface of the upper mold 10, and the other surface is flush with the tip of the peripheral wall 6. The reason why the peripheral wall 6 is provided is to reinforce the opening 7. If the block body 8 protrudes from the peripheral wall provided on the surface of the resin insert 4, the thickness of the foam layer becomes smaller and a difference in surface hardness occurs, which is not preferable. Next, the skin 2 placed on the lower mold 9
After injecting a foaming solution such as polyurethane into the back side of the mold, the mold is clamped and the foaming solution is hardened to form the foam layer 3.
form.
本発明方法において使用する上記ブロツク体８
は、例えば発泡スチロール、発泡ポリウレタン等
の硬質のもので比重0.01〜0.20、好ましくは0.02
〜0.05を使用するものである。 The above block body 8 used in the method of the present invention
is a hard material such as expanded polystyrene or expanded polyurethane, and has a specific gravity of 0.01 to 0.20, preferably 0.02.
~0.05 is used.
本発明において軟質のブロツク体を使用すれ
ば、ブロツク体は発泡圧によつて変形して発泡層
３の肉厚に差を生じ表面の平滑性が損なわれる。
また、ゴム等の弾性体を使用する場合にはウレタ
ンの発泡圧で一度圧縮されたものが成形品の脱型
後、製品表面を押し上げて平滑性が損なわれる。 If a soft block body is used in the present invention, the block body will be deformed by the foaming pressure, causing a difference in the thickness of the foam layer 3 and impairing the surface smoothness.
Furthermore, when using an elastic material such as rubber, the material once compressed by the foaming pressure of urethane pushes up the surface of the molded product after it is removed from the mold, impairing its smoothness.
なお、本発明において樹脂製インサートを下モ
ールドに、また表皮を上モールドに設置したもよ
い。 In the present invention, the resin insert may be placed in the lower mold, and the skin may be placed in the upper mold.
（発明の効果）
以下のように本発明の発泡成形品の製造方法
は、表面に形成された突出した周壁を持つ開口部
に発泡樹脂ブロツク体を挿入した樹脂製インサー
トを用いることにより発泡原液の漏れを防止し
て、しかも該開口部に位置する発泡層の厚みを他
の部分とほぼ同じくすることにより表皮表面の平
滑性を良好にし、更に接着剤なしで上記ブロツク
体を開口部に嵌入できるためで極めて効率の良い
実用的な方法である。(Effects of the Invention) As described below, the method for manufacturing a foamed molded product of the present invention uses a resin insert in which a foamed resin block is inserted into an opening having a protruding peripheral wall formed on the surface of the foamed product. In addition to preventing leakage, by making the thickness of the foam layer located in the opening approximately the same as in other parts, the smoothness of the skin surface is improved, and furthermore, the block body can be fitted into the opening without the need for adhesive. This is an extremely efficient and practical method.
第１図は本発明方法によつて得られたインスト
ルメントパネルパツドの斜視図、第２図は第１図
のＡ−Ａ断面図、第３図は本発明の製造工程を示
す縦断面図である。
２……表皮、３……発泡層、４……樹脂製イン
サート、６……周壁、７……不必要開口部、８…
…ブロツク体、９……下モールド、１０……上モ
ールド。
FIG. 1 is a perspective view of an instrument panel pad obtained by the method of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a longitudinal cross-sectional view showing the manufacturing process of the present invention. It is. 2...Skin, 3...Foam layer, 4...Resin insert, 6...Peripheral wall, 7...Unnecessary opening, 8...
...Block font, 9...lower mold, 10...upper mold.
Claims (1)
発泡成形品の製造方法において、上記樹脂製イン
サートの不必要な開口部に周壁を形成し、該周壁
内に硬質発泡樹脂のブロツク体を挿入して上記開
口部を閉鎖してなる樹脂製インサートを一方のモ
ールドに設置し、他方のモールドに表皮を置いた
後、発泡液を注入して前記樹脂製インサートと表
皮間に発泡層を形成してなることを特徴とする発
泡成形品の製造方法。1. A method for manufacturing a foamed molded product having a foamed layer between a resin insert and a skin, including forming a peripheral wall in an unnecessary opening of the resin insert, and inserting a hard foamed resin block into the peripheral wall. A resin insert with the above opening closed is placed in one mold, a skin is placed in the other mold, and a foaming liquid is injected to form a foam layer between the resin insert and the skin. A method for manufacturing a foam molded product, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60173735A JPS6233614A (en) | 1985-08-06 | 1985-08-06 | Manufacture of product of expansion molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60173735A JPS6233614A (en) | 1985-08-06 | 1985-08-06 | Manufacture of product of expansion molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6233614A JPS6233614A (en) | 1987-02-13 |
| JPH0335094B2 true JPH0335094B2 (en) | 1991-05-27 |
Family
ID=15966159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60173735A Granted JPS6233614A (en) | 1985-08-06 | 1985-08-06 | Manufacture of product of expansion molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6233614A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0739621Y2 (en) * | 1990-03-27 | 1995-09-13 | 三ツ星ベルト株式会社 | Bonding structure of foam molded products and parts |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4828353A (en) * | 1971-08-18 | 1973-04-14 | ||
| JPS5315566B2 (en) * | 1975-07-16 | 1978-05-25 | ||
| JPS55107434A (en) * | 1979-02-10 | 1980-08-18 | Toyo Sash Kk | Manufacturing method of panel for construction use |
| JPS59127737A (en) * | 1983-01-11 | 1984-07-23 | Achilles Corp | Manufacture of heat insulating plate |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5315566U (en) * | 1976-07-22 | 1978-02-09 | ||
| JPS58180020U (en) * | 1982-05-22 | 1983-12-01 | ヤマハ株式会社 | Seal structure of composite structure for piano |
-
1985
- 1985-08-06 JP JP60173735A patent/JPS6233614A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4828353A (en) * | 1971-08-18 | 1973-04-14 | ||
| JPS5315566B2 (en) * | 1975-07-16 | 1978-05-25 | ||
| JPS55107434A (en) * | 1979-02-10 | 1980-08-18 | Toyo Sash Kk | Manufacturing method of panel for construction use |
| JPS59127737A (en) * | 1983-01-11 | 1984-07-23 | Achilles Corp | Manufacture of heat insulating plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6233614A (en) | 1987-02-13 |
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