JPH0761660B2 - Hollow product molding method and its product - Google Patents
Hollow product molding method and its productInfo
- Publication number
- JPH0761660B2 JPH0761660B2 JP19997888A JP19997888A JPH0761660B2 JP H0761660 B2 JPH0761660 B2 JP H0761660B2 JP 19997888 A JP19997888 A JP 19997888A JP 19997888 A JP19997888 A JP 19997888A JP H0761660 B2 JPH0761660 B2 JP H0761660B2
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- JP
- Japan
- Prior art keywords
- rim
- core
- hollow
- product
- molding
- 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
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding 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RIM（Reaction Injection Molding）あるいは
Ｒ−RIM（Reinforced−RIM）による中空製品を製造する
方法および、その製品に関するものである。TECHNICAL FIELD The present invention relates to a method for manufacturing a hollow product by RIM (Reaction Injection Molding) or R-RIM (Reinforced-RIM), and a product thereof.
［従来技術およびその問題点］ RIMあるいはＲ−RIM成形法と呼ばれている反応射出成形
法で使用される原料は、その粘度が低いため、原料の流
動性が良く、低射出圧力で表面積の大きい製品、肉厚の
製品や中空製品などが容易に成形できるので、射出成形
や圧縮成形で製造困難な形状の製品の製造に利用されて
いる。[Prior Art and its Problems] The raw material used in the reaction injection molding method called RIM or R-RIM molding method has a low viscosity, so that the raw material has a good fluidity and a low injection pressure and a large surface area. Large products, thick products and hollow products can be easily molded, so they are used to manufacture products that are difficult to manufacture by injection molding or compression molding.
RIMによって、中空製品を製造する場合、通常、射出成
形などと同様、型に製品の中空部と同形状の中子を設置
し、成形終了後、製品から中子を何らかの手段で取外す
方法で行われる。When manufacturing hollow products by RIM, usually, like injection molding, etc., a core with the same shape as the hollow part of the product is installed in the mold, and after molding is completed, the core is removed from the product by some means. Be seen.
しかし、中子の材質はRIM原料の反応性に悪影響を与え
ないものを使用する必要があり材質的に制約がある、中
空部の構造が簡単に場合でも中子の製作に時間がかか
る、中子製作費用が高い、などの欠点があった。また、
中空部の形状が複雑な場合や抜き勾配が負となるような
形状の場合は、中空製品を一体で製造することはほんど
不可能であった。However, it is necessary to use the material of the core that does not adversely affect the reactivity of the RIM raw material, and there is a material limitation.It takes time to manufacture the core even if the hollow structure is simple. There were drawbacks such as high child production costs. Also,
When the hollow portion has a complicated shape or a shape with a negative draft, it is almost impossible to integrally manufacture a hollow product.
従来、RIMによる中空製品を製造する方法で上記のよう
な欠点を改良した具体的な提案はされていないが、射出
成形，注型成形などで提案されている方法は利用可能と
考えられる。Conventionally, no specific proposal has been made to improve the above-mentioned drawbacks by the method of manufacturing a hollow product by RIM, but it is considered that the methods proposed by injection molding, cast molding, etc. can be used.
例えば、特公昭52−18226号公報では、中子に融解塩で
被覆した不活性の材料を使用する方法を開示している。
この方法で使用する中子は水を注入して流出させること
で取除かれるが、中子の除去作業工程が繁雑で生産性が
低い。また、中子が脆く、重いため、中子の取扱いが難
しいという欠点があった。特開昭51−111262号公報で
は、中子として中空の可撓性のある材料を使用する方法
が提案されている。この方法には具体的材料の提案がな
く、また、中子の作成法についても不明である。For example, Japanese Examined Patent Publication (Kokoku) No. 52-18226 discloses a method of using an inert material having a core coated with a molten salt.
The core used in this method is removed by injecting water and letting it flow out, but the core removal process is complicated and the productivity is low. Further, since the core is fragile and heavy, it is difficult to handle the core. JP-A-51-111262 proposes a method of using a hollow flexible material as a core. There is no suggestion of specific materials for this method, and the method of making the core is unknown.
RIM原料は高反応性であり、また、成形の際、反応熱に
より原料温度が高くなるため、中子には耐薬品性および
耐熱性に劣る材料を使用することができない。公知の可
撓性を有する材料の多くは、通常、耐薬品性や耐熱性が
劣り、RIM原料の反応性を阻害したり、高温によって変
形したりするため、本発明で中子として適用することは
困難である。Since the RIM raw material is highly reactive and the temperature of the raw material rises due to the reaction heat during molding, a material having poor chemical resistance and heat resistance cannot be used for the core. Many of the known materials having flexibility are usually inferior in chemical resistance and heat resistance, inhibit the reactivity of the RIM raw material, or are deformed by high temperature, so that they should be applied as cores in the present invention. It is difficult.
特開昭54−156080号公報では、低融点合金からなる中子
を使用した方法が開示されている。この方法では、製品
を型から取出した後、中子を溶融・除去するが、中子の
溶融に長時間を必要とする、低融点合金の回収率が悪く
コスト高になる、中子が重く成形の作業性が悪い、など
の欠点がある。JP-A-54-156080 discloses a method using a core made of a low melting point alloy. In this method, the core is melted and removed after removing the product from the mold, but it takes a long time to melt the core, the recovery rate of the low melting point alloy is poor and the cost is high, and the core is heavy. There are drawbacks such as poor moldability.
特開昭61−205108号公報では、中子に脆性破壊する材料
を使用する方法を提案している。この方法では、製品を
型から取出した後、中子を破壊粉砕して除去するが、粉
砕工程が繁雑となる、中子が脆く重量も重いため成形の
作業性が悪い、などの欠点があった。Japanese Unexamined Patent Publication (Kokai) No. 61-205108 proposes a method of using a brittle fracture material for the core. In this method, the product is taken out of the mold and then the core is destroyed and crushed and removed.However, the crushing process is complicated, and the workability of molding is poor because the core is fragile and heavy. It was
本発明の目的は、RIMあるいはＲ−RIM用において中空製
品を製造する際、特定の樹脂からなる中子を使用するこ
とで成形操作が容易で、中子が中空であるため特別の理
由がないかぎり中子除去工程が省略できる生産性の良い
中空製品を製造する方法さらに、RIMまたはＲ−RIM原料
からなる成形品と中子の中空成形品とが一体となった中
空製品を提供することにある。The object of the present invention is that when a hollow product is manufactured for RIM or R-RIM, a molding operation is easy by using a core made of a specific resin, and there is no special reason because the core is hollow. A method for producing a hollow product with high productivity that can omit the core removing step as much as possible. Further, to provide a hollow product in which a molded product made of RIM or R-RIM raw material and a hollow molded product of the core are integrated. is there.
［問題点を解決するための手段］ 上記目的達成のため、種々検討した結果、ASTM Ｄ−64
8（荷重4.6kg/cm2）によって測定した熱変形温度が所定
温度以上である樹脂製の中空成形品を中子として使用す
ると良いことを見出だし、本発明を完成した。[Means for Solving Problems] As a result of various studies for achieving the above-mentioned object, ASTM D-64
The inventors have found that it is preferable to use, as a core, a resin hollow molding having a heat distortion temperature measured by 8 (load 4.6 kg / cm 2 ) of a predetermined temperature or higher, and completed the present invention.
すなわち、本発明の目的は、RIMあるいはＲ−RIMによる
中空製品の成形において、ASTM Ｄ−648（荷重4.6kg/c
m2）で測定した時の熱変形温度が100℃以上の樹脂製の
中空成形品を中子として使用することにより達成でき
る。That is, the object of the present invention is to form a hollow product by RIM or R-RIM in accordance with ASTM D-648 (load 4.6 kg / c).
This can be achieved by using a hollow molded article made of resin with a heat distortion temperature of 100 ° C or higher when measured in m 2 ) as a core.
ASTM Ｄ−648（荷重4.6kg/cm2）で測定した時の熱変形
温度が100℃未満の樹脂製の中空成形品を中子として使
用した場合、後述する比較例１に示すように、RIM成形
で中空製品を製造する際に、RIM原料の発熱や型温度の
影響で中子が変形して、所定の成形品を得ることができ
なくなるため、好ましくない。When a resin hollow molding having a heat distortion temperature of less than 100 ° C. when measured by ASTM D-648 (load 4.6 kg / cm 2 ) is used as a core, as shown in Comparative Example 1 described later, RIM When manufacturing a hollow product by molding, the core is deformed due to the heat generation of the RIM raw material and the temperature of the mold, which makes it impossible to obtain a predetermined molded product, which is not preferable.
本発明では中子が軽量で成形作業が効率化できるだけで
なく、中子が中空であるため特別な理由が無いかぎり製
品から中子を取除く必要がなく生産性工程が簡略にな
る、中子の材料の選択によって製品内面にRIMあるいは
Ｒ−RIM原料では得られない有用な特性を与えることが
できる、射出成形法やブロー成形法で製造困難な厚肉製
品を容易に製造できる、などの特長も有している。In the present invention, the core is not only lightweight and the molding work can be made efficient, but since the core is hollow, it is not necessary to remove the core from the product unless there is a special reason, and the productivity process is simplified. Features such as the ability to give useful properties that cannot be obtained with RIM or R-RIM raw materials to the inner surface of the product by selecting the material of the above, and the easy production of thick products that are difficult to manufacture by injection molding or blow molding. I also have.
これら樹脂製の中子はRIMあるいはＲ−RIMの特徴である
成形圧力の低いRIMあるいはＲ−RIM原料を使用すること
ではじめて利用可能であり、射出成形や圧縮成形で利用
することは非常に困難である。These resin cores can be used only by using RIM or R-RIM raw material with low molding pressure, which is a characteristic of RIM or R-RIM, and it is very difficult to use it in injection molding or compression molding. Is.
本発明で中子として使用する荷重4.6kg/cm2で測定した
熱変形温度100℃以上の樹脂としては、ポリブチレンテ
レフタレート，ポリエチレンテレフタレート，ポリシロ
ヘキサンジメチレンテレフタレート,6ナイロン,11ナイ
ロン,12ナイロン,46ナイロン,66ナイロン,610ナイロン,
MXD6ナイロン，一部のポリプロピレン,ABS,ポリカーボ
ネート，ポリアセタール，ポリフェニレンエーテル，ポ
リフェニレンスルフイド，ポリサルフォン，ポリエーテ
ルサルフォン，ポリエーテルエーテルケトンなどがあ
る。これらの樹脂は単独でも、２種類以上のものを混合
したり、共重合したものやポリマーアロイにしたものな
ども使用できる。Resins having a heat distortion temperature of 100 ° C. or higher measured with a load of 4.6 kg / cm 2 used as a core in the present invention include polybutylene terephthalate, polyethylene terephthalate, polysiloxane dimethylene terephthalate, 6 nylon, 11 nylon and 12 nylon. , 46 nylon, 66 nylon, 610 nylon,
MXD6 nylon, some polypropylene, ABS, polycarbonate, polyacetal, polyphenylene ether, polyphenylene sulfide, polysulfone, polyethersulfone, polyetheretherketone, etc. These resins may be used alone or as a mixture of two or more kinds, or as a copolymer or a polymer alloy.
上記樹脂の中では熱変形温度150℃以上のポリエチレン
テレフタレート,6ナイロン,66ナイロン，ポリカーボネ
ートやこれらの樹脂をベースとしたポリマーアロイなど
が好ましい。Among the above resins, polyethylene terephthalate, 6 nylon, 66 nylon, polycarbonate having a heat distortion temperature of 150 ° C. or higher and polymer alloys based on these resins are preferable.
これらの樹脂は、ガラス繊維，カーボン繊維，グラファ
イト繊維，ボロン繊維，スチール繊維，繊維状マグネシ
ュウム，タルク，マイカ，カオリン，ワラストナイト，
炭酸カルシュウム、水酸化マグネシュウム，カーボンブ
ラック，二硫化モリブテン，チタン酸カリュウムなどが
添加されていてもよい。These resins are glass fiber, carbon fiber, graphite fiber, boron fiber, steel fiber, fibrous magnesium, talc, mica, kaolin, wollastonite,
Calcium carbonate, magnesium hydroxide, carbon black, molybdenum disulfide, potassium titanate, etc. may be added.
これら樹脂からなる中子の中空成形品は、公知のブロー
成形法によって容易に製造でき、量産も容易である。出
来た中子は軽量であり、耐衝撃性にも優れているため、
成形作業での取扱いが容易である。また、中子に使用す
る中空成形品の外面には、RIM原料による成形品との密
着性を高めるため、突起のあるものを使用することが望
ましい。Hollow molded articles of cores made of these resins can be easily manufactured by a well-known blow molding method, and mass production is also easy. The resulting core is lightweight and has excellent impact resistance,
Easy to handle during molding work. In addition, it is preferable to use a hollow molded product having a projection on the outer surface of the hollow molded product, which is used for the core, in order to enhance the adhesion to the molded product made of the RIM raw material.
本発明で使用されるRIM原料としては、ポリウレタンRIM
原料，ナイロンRIM原料，エポキシRIM原料，不飽和ポリ
エステルRIM原料，ジシクロペンタジエンRIM原料，ポリ
ユリアRIM原料，アクリラメートRIM原料などがある。ナ
イロンRIM原料の具体例としては、UBEナイロンRIM（宇
部興産社製）,NYRIM（DSM社製）が、ジシクロペンタジ
エンRIM原料の具体例としては、メトン（帝人社製）
が、アクリラメートRIM原料の具体例としては、アリマ
ックス（アッシュランド・ケミカル社製）が、ポリウレ
タンRIMの具体例としては、ウレタンRIM PUC501−Ｒ
（大日精化工業社製）などがある。The RIM raw material used in the present invention is polyurethane RIM.
Raw materials, nylon RIM raw materials, epoxy RIM raw materials, unsaturated polyester RIM raw materials, dicyclopentadiene RIM raw materials, polyurea RIM raw materials, acrylate lame raw materials. Specific examples of nylon RIM raw materials include UBE nylon RIM (manufactured by Ube Industries) and NYRIM (manufactured by DSM), and specific examples of dicyclopentadiene RIM raw materials include Meton (manufactured by Teijin Limited).
However, a specific example of the acrylate RIM raw material is Alimax (manufactured by Ashland Chemical Co., Ltd.), and a specific example of the polyurethane RIM is urethane RIM PUC501-R.
(Manufactured by Dainichi Seika Kogyo Co., Ltd.).
Ｒ−RIM原料としては、上記RIM原料にミルドガラス，繊
維状マグネシウム化合物，鉱物繊維，グラファイト繊
維，ボロン繊維，炭酸ガルシウム，ワラストナイト，カ
オリン，黒鉛，カーボンブラック，二硫化モリブデンな
どの強化材や充填剤を添加したものである。これら強化
材や充填材の添加量は、RIM原料100重量部に対して５〜
120重量部であることが好ましい。As the R-RIM raw material, a reinforcing material such as milled glass, fibrous magnesium compound, mineral fiber, graphite fiber, boron fiber, gallium carbonate, wollastonite, kaolin, graphite, carbon black or molybdenum disulfide may be used as the RIM raw material. A filler is added. The addition amount of these reinforcing materials and fillers is 5 to 100 parts by weight of the RIM raw material.
It is preferably 120 parts by weight.
本発明で中空製品の製造は、前記方法で作成した中子を
設置した型を所定温度に調節した後、所定温度に調整さ
れた液状のRIM原料（あるいはＲ−RIM原料）をRIM成形
機（あるいはＲ−RIM成形機），注型成形機または手操
作で型内へ入れることにより行われる。In the production of the hollow product in the present invention, the mold in which the core prepared by the above method is installed is adjusted to a predetermined temperature, and then the liquid RIM raw material (or R-RIM raw material) adjusted to the predetermined temperature is supplied to the RIM molding machine ( Alternatively, R-RIM molding machine), cast molding machine, or manual operation can be used to put the mold into the mold.
これらにより製造される中空製品の具体的な用途として
自動車のエンジンまわりの三次元構造の中空パイプ，燃
料などのタンク類，大型部品などが挙げられる。Specific applications of the hollow products manufactured by these include hollow pipes with a three-dimensional structure around the engine of automobiles, tanks for fuel and the like, and large parts.
［実施例］ 以下に実施例によって本発明を説明する。[Examples] The present invention will be described below with reference to Examples.
実施例１ ポリエチレンテレフタレート（ユニチカ社製、PET120
7、熱変形温度185℃〔ASTM Ｄ−648（荷重4.6kg/cm2）
にて測定〕）を用いて、第１図の中子３に示すパイプ
（厚さ約30mm、外側表面に１〜2mmの突起を多数つけ
た）をブロー成形で製造した。Example 1 Polyethylene terephthalate (PET120 manufactured by Unitika Ltd.)
7, heat distortion temperature 185 ℃ [ASTM D-648 (load 4.6kg / cm 2 )
Of the core 3 shown in FIG. 1 (thickness of about 30 mm, with a large number of protrusions of 1 to 2 mm on the outer surface) was produced by blow molding.
この中子を第１図にように型に設置し、型温を150℃に
昇温した。この型へ100℃に加熱したUBEナイロンRIM原
料UX−Ｃ（宇部興産社製）を入れ、型温を150℃で保持
した。５分後、型を開き、成形品を取り出した。中子は
変形することなく、内側がポリエチレンテレフタレー
ト、外側がナイロンからなる一体の中空成形品が得られ
た。両樹脂の密着性もよくポリエチレンテレフタレート
の内面は平滑であった。This core was placed in a mold as shown in Fig. 1 and the mold temperature was raised to 150 ° C. UBE nylon RIM raw material UX-C (manufactured by Ube Industries, Ltd.) heated to 100 ° C. was put into this mold, and the mold temperature was kept at 150 ° C. After 5 minutes, the mold was opened and the molded product was taken out. The core was not deformed, and an integral hollow molded product having polyethylene terephthalate inside and nylon outside was obtained. The adhesion between both resins was good and the inner surface of polyethylene terephthalate was smooth.
実施例２ ポリエチレンテレフタレートの代わりにポリプロピレン
（宇部興産社製、UBEポリプロB101H、熱変形温度113℃
〔ASTM Ｄ−648（荷重4.6kg/cm2）にて測定〕）を使用
した以外は実施例１と同様の方法で実施した。得た成形
品は実施例１と同様の効果であった。Example 2 Polypropylene instead of polyethylene terephthalate (manufactured by Ube Industries, UBE Polypro B101H, heat distortion temperature 113 ° C.)
[Measurement with ASTM D-648 (load 4.6 kg / cm 2 )] was performed in the same manner as in Example 1. The obtained molded product had the same effect as in Example 1.
比較例１ 実施例２で使用したポリプロピレンの代わりに熱変形温
度95℃（ASTM Ｄ−648（荷重4.6kg/cm2）にて測定）の
ポリプロピレン（宇部興産社製、UBEポリプロB601H）を
使用した他は実施例１と同様の方法で実施した。得た成
形品は中子が変形し、所定の形状のものが得られなかっ
た。Comparative Example 1 Instead of the polypropylene used in Example 2, polypropylene having a heat distortion temperature of 95 ° C. (measured by ASTM D-648 (load 4.6 kg / cm 2 )) (UBE Polypro B601H manufactured by Ube Industries, Ltd.) was used. Others were carried out in the same manner as in Example 1. The core of the obtained molded product was deformed, and a molded product having a predetermined shape could not be obtained.
実施例３ ポリエチレンテレフタレートの代わりに、６ナイロン
（宇部興産社製、UBEナイロン1030B、熱変形温度170℃
〔ASTM Ｄ−648（荷重4.6kg/cm2）にて測定〕）を使用
した以外は実施例１と同一の方法で実施した。得られた
結果は実施例１と同様であった。Example 3 Instead of polyethylene terephthalate, 6 nylon (manufactured by Ube Industries, UBE nylon 1030B, heat distortion temperature 170 ° C.)
[Measurement with ASTM D-648 (load 4.6 kg / cm 2 )] was carried out in the same manner as in Example 1. The results obtained were similar to those of Example 1.
実施例４ ポリエチレンテレフタレートの代わりにポリフェニレン
エーテルと66ナイロンを主成分とするポリマーアロイ
（GE社製、Noryl GTX 910、熱変形温度195℃〔ASTM
Ｄ−648（荷重4.6kg/cm2）にて測定〕）を使用し、UBE
ナイロンRIM原料UX−Ｃの代わりに、UBEナイロンRIM原
料UX−CL（宇部興産社製、ミルドガラス20wt％添加グレ
ード）を使用した他は実施例１と同様に実施した。得ら
れた結果は実施例１と同様であった。Example 4 Instead of polyethylene terephthalate, a polymer alloy mainly composed of polyphenylene ether and 66 nylon (manufactured by GE, Noryl GTX 910, heat distortion temperature 195 ° C [ASTM
D-648 (load 4.6 kg / cm 2 )])
The same procedure as in Example 1 was performed except that UBE nylon RIM raw material UX-CL (manufactured by Ube Industries, Ltd., milled glass 20 wt% addition grade) was used instead of nylon RIM raw material UX-C. The results obtained were similar to those of Example 1.
実施例５ ポリエチレンテレフタレートの代わりにポリフェニレン
エーテルとポリスチレンを主成分とするポリマーアロイ
（EPL社製、Noryl PPO534J、熱変形温度177℃〔ASTM
Ｄ−648（荷重4.6kg/cm2）にて測定〕）を使用し、UBE
ナイロンRIM原料UX−Ｃの代わりに、ウレタンRIM用原料
（大日精化工業社製、PUC501−Ｒ）を使用し、型温を80
℃にした以外は、実施例１と同一の方法で実施した。得
られた結果は実施例１と同様であった。Example 5 Instead of polyethylene terephthalate, a polymer alloy containing polyphenylene ether and polystyrene as main components (EPL, Noryl PPO534J, heat distortion temperature 177 ° C. [ASTM
D-648 (load 4.6 kg / cm 2 )])
Instead of Nylon RIM raw material UX-C, urethane RIM raw material (PUC501-R manufactured by Dainichi Seika Kogyo Co., Ltd.) is used, and the mold temperature is 80%.
It carried out by the same method as Example 1 except having made it into (degreeC). The results obtained were similar to those of Example 1.
［発明の効果］ 反応射出成形による中空製品の成形において、中子とし
てASTM Ｄ−648（荷重4.6kg/cm2）で測定した熱変形温
度が100℃以上である樹脂製の中空成形品を使用するこ
とにより、中子が軽量であるため、成形操作が容易とな
る。また、特に中子を取外す必要が無く、生産工程が簡
略化される。さらに、中子の材料の選択によって、製品
内面にRIMあるいはＲ−RIM原料では得られない有用な特
性が付与された反応射出成形した樹脂と中子とが一体と
なった中空製品が得られる。また、射出成形法やブロー
成形法で製造困難な厚肉製品を容易に製造できるなどの
効果がある。[Effects of the Invention] In molding hollow products by reaction injection molding, hollow cores made of resin with a heat distortion temperature of 100 ° C or higher measured by ASTM D-648 (load 4.6 kg / cm 2 ) are used as cores. By doing so, since the core is lightweight, the molding operation becomes easy. Further, it is not necessary to remove the core, and the production process is simplified. Further, by selecting the material of the core, a hollow product in which the core and the reaction injection-molded resin, in which the inner surface of the product is provided with useful properties that cannot be obtained by the RIM or R-RIM raw material, can be obtained. Further, there is an effect that a thick product which is difficult to manufacture by the injection molding method or the blow molding method can be easily manufactured.
第１図は本発明に使用する中子の１例として、パイプを
型内に挿入・設置した状態を示す断面図である。 １……上型、２……下型、 ３……中子、４……成形品、 ５……原料注入口。FIG. 1 is a sectional view showing a state in which a pipe is inserted and installed in a mold as an example of a core used in the present invention. 1 ... Upper mold, 2 ... Lower mold, 3 ... Core, 4 ... Molded product, 5 ... Raw material inlet.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 22:00 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area B29L 22:00
Claims (2)
て、中子としてASTM Ｄ−648規定（荷重4.6kg/cm2）で
測定した熱変形温度が100℃以上の樹脂からなる中空成
形品を用いることを特徴とする中空製品の成形方法。1. A hollow molded product made of a resin having a heat distortion temperature of 100 ° C. or higher measured by ASTM D-648 standard (load 4.6 kg / cm 2 ) in molding a hollow product by reaction injection molding. A method for molding a hollow product, which is characterized in that:
定（荷重4.6kg/cm2）で測定した熱変形温度が100℃以上
の樹脂からなる中子とが一体となった中空製品。2. A hollow product in which a reaction injection-molded resin and a core made of a resin having a heat distortion temperature of 100 ° C. or higher measured by ASTM D-648 standard (load 4.6 kg / cm 2 ) are integrated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19997888A JPH0761660B2 (en) | 1988-08-12 | 1988-08-12 | Hollow product molding method and its product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19997888A JPH0761660B2 (en) | 1988-08-12 | 1988-08-12 | Hollow product molding method and its product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0250811A JPH0250811A (en) | 1990-02-20 |
| JPH0761660B2 true JPH0761660B2 (en) | 1995-07-05 |
Family
ID=16416747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19997888A Expired - Lifetime JPH0761660B2 (en) | 1988-08-12 | 1988-08-12 | Hollow product molding method and its product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0761660B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100902865B1 (en) * | 2008-10-30 | 2009-06-16 | 강옥수 | Manufacturing method for pb pipe coupler |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2246770B (en) * | 1990-07-27 | 1995-03-29 | Osaka Cement | Tetracalcium phosphate-based hardening materials |
| US7656504B1 (en) | 1990-08-21 | 2010-02-02 | Nikon Corporation | Projection exposure apparatus with luminous flux distribution |
| KR100933749B1 (en) * | 2009-01-22 | 2009-12-24 | 강옥수 | Connection structure of wall embedded faucet |
-
1988
- 1988-08-12 JP JP19997888A patent/JPH0761660B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100902865B1 (en) * | 2008-10-30 | 2009-06-16 | 강옥수 | Manufacturing method for pb pipe coupler |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0250811A (en) | 1990-02-20 |
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