JPH01157824A - Manufacture of hollow urethane foaming molded product - Google Patents
Manufacture of hollow urethane foaming molded productInfo
- Publication number
- JPH01157824A JPH01157824A JP62317114A JP31711487A JPH01157824A JP H01157824 A JPH01157824 A JP H01157824A JP 62317114 A JP62317114 A JP 62317114A JP 31711487 A JP31711487 A JP 31711487A JP H01157824 A JPH01157824 A JP H01157824A
- Authority
- JP
- Japan
- Prior art keywords
- hollow core
- mold
- hollow
- core body
- solid particles
- 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.)
- Granted
Links
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005187 foaming Methods 0.000 title abstract description 8
- 239000006260 foam Substances 0.000 claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 29
- 239000007787 solid Substances 0.000 claims abstract description 27
- 238000010107 reaction injection moulding Methods 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 12
- 239000007924 injection Substances 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 11
- 238000007664 blowing Methods 0.000 abstract description 8
- 239000003566 sealing material Substances 0.000 abstract description 2
- 239000011162 core material Substances 0.000 abstract 11
- 239000007788 liquid Substances 0.000 abstract 1
- 239000011550 stock solution Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000010097 foam moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- BBEAQIROQSPTKN-UHFFFAOYSA-N pyrene Chemical compound C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000010582 Pisum sativum Nutrition 0.000 description 1
- 240000004713 Pisum sativum Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Moulding By Coating Moulds (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、たとえば、自動車のアームレスト、アシスト
グリップ、ヘッドレスト、グローブボックスリッド、エ
アスポイラ−のような合成ｍｒｔｔａ中空芯体を有する
中空ウレタン発泡成形品の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION OBJECTIVES OF THE INVENTION (INDUSTRIAL APPLICATION) The present invention has a synthetic mrtta hollow core body, for example for automobile armrests, assist grips, headrests, glove box lids, air spoilers. This invention relates to a method for manufacturing hollow urethane foam molded products.
（従来の技術）
従来の中空ウレタン発泡成形品の１１造方法の一例を第
３図ないし第８図に基づいて説明する。(Prior Art) An example of 11 manufacturing methods for a conventional hollow urethane foam molded product will be explained based on FIGS. 3 to 8.
１はポリエチレンおよびボリア０ピレンなどの合成樹脂
をプロー成形してなる中空芯体で、この中空芯体１には
、ブロー成形したことにより、その内部空間の中空部２
と外部空間とを連通する空気吹込みビン跡３が生じてい
る。また、前記中空芯体１の両側−には、第４図ないし
第８図における下面に同口したテーバ状の嵌合孔４が形
成されており、この嵌合孔４の上部は縮径部５となって
上面に開口している。1 is a hollow core body made by blow molding synthetic resin such as polyethylene and boria 0 pyrene.
An air blowing bottle trace 3 is created that communicates the space with the outside space. Further, on both sides of the hollow core body 1, tapered fitting holes 4 are formed which have the same opening on the lower surface in FIGS. 4 to 8, and the upper part of the fitting hole 4 has a reduced diameter part. 5 and is open on the top surface.
また、１１はウレタン発泡成形用型で、この成形用型１
１は、接離自在の上型１２と下型１３とからなっており
、型閉時にこれら上型１２および下型１３の内部にキャ
ビティ１４が形成されるものである。そして、前記下型
１３の内底面両側部には、前記中空芯体１の嵌合孔４に
嵌合されるボス１５が形成されており、このボス１５の
上部には、前記嵌合孔４の縮径部５に貫通され型閉時に
前記上型１２に当接される縮径部１６が形成されている
。In addition, 11 is a mold for urethane foam molding, and this mold 1
1 consists of an upper mold 12 and a lower mold 13 that can be freely moved in and out, and a cavity 14 is formed inside these upper mold 12 and lower mold 13 when the mold is closed. A boss 15 that is fitted into the fitting hole 4 of the hollow core body 1 is formed on both sides of the inner bottom surface of the lower mold 13. A reduced diameter portion 16 is formed which penetrates the reduced diameter portion 5 and comes into contact with the upper mold 12 when the mold is closed.
そうして、成形にあたっては、ウレタンとの接着力を高
めるために中空芯体１をプライマー処理した後、第５図
および第６図に示すように、成形用型１１内に中空芯体
１を装着する。この状態で、中空芯体１の嵌合孔４と下
型１３のボス１５との嵌合により、中空芯体１は成形用
型１１内で中に浮いた状態に支持される。つぎに、第７
図に示すように、成形用型１１の内面と中空芯体１との
間にウレタン原液を注入して、中空芯体１のほぼ全周を
被覆するウレタン発泡体２１を成形する。Then, for molding, after the hollow core 1 is treated with a primer to increase the adhesive strength with the urethane, the hollow core 1 is placed in a mold 11 as shown in FIGS. 5 and 6. Installing. In this state, the hollow core 1 is supported in a floating state within the mold 11 by fitting the fitting hole 4 of the hollow core 1 with the boss 15 of the lower mold 13 . Next, the seventh
As shown in the figure, a urethane stock solution is injected between the inner surface of the mold 11 and the hollow core 1 to form a urethane foam 21 that covers almost the entire circumference of the hollow core 1.
その際、成形用型１１内に注入されたウレタン原液が発
泡膨張するが、その反応に伴う発熱（約８０℃〜１５０
℃）により、中空芯体１が軟化し、第７図に示すように
、ウレタン原液の発泡圧で中空芯体１の各面が凹む。こ
のとき、中空芯体１の内部の空気は、空気吹込みビン跡
３より外部に流出するが、ついで、つ、レタン原液の発
泡の立上がりによってビン跡３がウレタン発泡体２１で
塞がれるので、中空芯体１の各面が凹んだままの状態で
、ウレタン発泡体２１は硬化する。さらに、離型後は、
第８図に示すように、ウレタン発泡体２１が冷却される
のに伴い、中空芯体１の内部の空気も冷却されて収縮す
るので、中空芯体１とウレタン発泡体２１とからなる中
空ウレタン発泡成形品２２の各面の中央部が凹み、製品
として欠陥を生じることになる。At that time, the urethane stock solution injected into the mold 11 foams and expands, but the reaction accompanies heat generation (approximately 80°C to 150°C).
℃), the hollow core 1 is softened, and as shown in FIG. 7, each surface of the hollow core 1 is dented by the foaming pressure of the urethane stock solution. At this time, the air inside the hollow core body 1 flows out through the air blowing bottle mark 3, but then the bottle mark 3 is blocked by the urethane foam 21 due to the rise of foaming of the urethane stock solution. The urethane foam 21 is cured while each surface of the hollow core 1 remains recessed. Furthermore, after demolding,
As shown in FIG. 8, as the urethane foam 21 is cooled, the air inside the hollow core 1 is also cooled and contracts. The center of each side of the foamed molded product 22 is depressed, resulting in a defective product.
そこで、このような欠陥を改善するために、従来から種
々の提案がなされている。第９図ないし第１１図は、そ
の−例を示すものであるが、この方法では、第９図に示
すように、予め、中空芯体１の内部に、空気吹込みビン
跡３から固体粒子３１を完全に充填した後に、ビン跡３
をシール体３２により塞いだ上で、ウレタン発泡成形を
行なう。Therefore, various proposals have been made in the past in order to improve such defects. 9 to 11 show examples thereof. In this method, as shown in FIG. After filling 31 completely, bottle mark 3
After closing with a sealing body 32, urethane foam molding is performed.
しかし、空気吹込みビン跡３が塞がっているため、中空
芯体１内に充填された固体粒子３１間に残留した空気が
ウレタン原液の反応熱により膨張するのに伴って、第１
０図に示すように、中空芯体１が膨らみ、そのまま硬化
する。そのため、離型後は、第１１図に示すように、ウ
レタン発泡体２１が冷却されるのに伴って、中空芯体１
の内部の空気が冷却されて収縮し、この中空芯体１が元
の形状に戻ると、成形品２２の各面の中央部が凹み、や
はり製品として欠陥を生じることになる。However, since the air blowing bottle trace 3 is blocked, the air remaining between the solid particles 31 filled in the hollow core body 1 expands due to the reaction heat of the urethane stock solution, and the first
As shown in Figure 0, the hollow core body 1 swells and then hardens. Therefore, after the mold is released, as the urethane foam 21 is cooled, the hollow core 1
When the air inside the molded product 22 cools and contracts, and the hollow core 1 returns to its original shape, the center of each surface of the molded product 22 becomes depressed, resulting in a defective product.
なお、第９図ないし第１１図に示す方法では、成形後に
、ウレタン発泡体２１および中空芯体１に通孔が形成さ
れて、この中空芯体１内の固体粒子３１が除去される。In the method shown in FIGS. 9 to 11, after molding, through holes are formed in the urethane foam 21 and the hollow core 1, and the solid particles 31 in the hollow core 1 are removed.
（発明が解決しようとする問題点）
上述のように、従来の中空ウレタン発泡成形品の製造方
法では、中空芯体の内部が中空のままの状態でウレタン
発泡体を成形していたため、ウレタン原液の発泡圧によ
る収縮およびその後の冷却による収縮により、完成した
成形品の各面が凹む問題があった。また、中空芯体内に
固体粒子を充填してウレタン発泡体を成形する方法でも
、固体粒子間に残留した空気が膨張、収縮するため、成
形品の各面に生じる凹みを十分には防止できない問題が
あった。(Problems to be Solved by the Invention) As mentioned above, in the conventional manufacturing method of hollow urethane foam molded products, the urethane foam was molded with the hollow core body remaining hollow, so the urethane stock solution was There was a problem in that each side of the completed molded product was dented due to shrinkage due to the foaming pressure and subsequent cooling. In addition, even with the method of molding urethane foam by filling solid particles into a hollow core, the air remaining between the solid particles expands and contracts, making it impossible to sufficiently prevent dents from forming on each side of the molded product. was there.
本発明は、上述のような問題点を解決しようとするもの
で、中空ウレタン発泡成形品の製造にあたって中空芯体
の変形を防止し、所定の形状の成形品を得られるように
することを目的とするものである。The present invention is an attempt to solve the above-mentioned problems, and aims to prevent deformation of a hollow core during the production of a hollow urethane foam molded product, and to enable a molded product with a predetermined shape to be obtained. That is.
（問題点を解決するための手段）
本発明の中空ウレタン発泡成形品の製造方法は、合成樹
脂で中空成形された中空芯体に固体粒子を充填し、この
固体粒子を充填した中空芯体を成形用型内に装着して、
ウレタン反応射出成形により前記、中空芯体のほぼ全周
をウレタン発泡体で覆ってなる中空ウレタン発泡成形品
を得るが、その際、前記中空芯体の内部空間と前記成形
用型の外部空間とを連通させた状態でウレタンを発泡硬
化させるものである。(Means for Solving the Problems) The method for producing a hollow urethane foam molded product of the present invention involves filling a hollow core body formed by hollow molding with a synthetic resin with solid particles, and then filling the hollow core body filled with the solid particles with solid particles. Install it in the mold for molding,
The hollow urethane foam molded article is obtained by urethane reaction injection molding, in which almost the entire circumference of the hollow core is covered with urethane foam. The urethane is foamed and cured while the two are in communication with each other.
（作用）
本発明の中空ウレタン発泡成形品の製造方法は、ウレタ
ン原液の発泡圧に抗して、中空芯体の内部に充填された
固体粒子により中空芯体の収縮変形を防止する。また、
固体粒子間に残留しウレタン原液の反応熱により膨張し
た空気を成形用型外に流出させることにより、中空芯体
の膨張変形を防止する。さらに、中空芯体およびウレタ
ン発泡体の冷却、硬化に際しても、固体粒子および中空
芯体内への空気の流入により、この中空芯体の収縮変形
を防止する。(Function) The method for producing a hollow urethane foam molded article of the present invention prevents shrinkage and deformation of the hollow core by the solid particles filled inside the hollow core against the foaming pressure of the urethane stock solution. Also,
Expansion and deformation of the hollow core is prevented by allowing the air remaining between the solid particles and expanded by the reaction heat of the urethane stock solution to flow out of the mold. Furthermore, even when the hollow core and the urethane foam are cooled and hardened, the solid particles and air flow into the hollow core prevent the hollow core from shrinking and deforming.
（実施例）
以下、本発明の中空ウレタン発泡成形品の製造方法の一
実施例を第１図および第２図に基づいて説明する。なお
、構成は、基本的に、先に説明した従来例と同様なので
、対応する部分には同一符号を付し、その説明を省略す
る。(Example) Hereinafter, an example of the method for manufacturing a hollow urethane foam molded article of the present invention will be described based on FIGS. 1 and 2. Note that the configuration is basically the same as that of the conventional example described above, so corresponding parts are denoted by the same reference numerals and the explanation thereof will be omitted.
第１図に示すように、成形用型１１の上型１２゛には、
図示上面に開口したたとえば一対のねじ孔４１が形成さ
れているとともに、これらねじ孔４１の下方に連続して
、上型１２の下面すなわちキャビテイ面に開口し下部を
縮径した注射針嵌合孔４２が形成されている。そして、
これら嵌合孔４２に、基部（図示上部）を拡径しかつ先
端を鋭く尖らせた中空ビンとしての筒状の注射針４３が
嵌合されているとともに、前記ねじ孔４１に螺合された
筒状の中空ねじ４４により固定されている。前記注射針
４３は、下型１３と上型１２とを閉じたとき、成形用型
１１のキャビティ１４内に装着された中空芯体１内に貫
入されるように、先端側が上型１２の下面より適当な長
さ突出されている。As shown in FIG. 1, the upper mold 12' of the mold 11 includes:
For example, a pair of screw holes 41 are formed in the upper surface as shown in the figure, and a needle fitting hole is formed continuously below these screw holes 41 in the lower surface of the upper mold 12, that is, the cavity surface, and the diameter of the lower portion is reduced. 42 is formed. and,
A cylindrical injection needle 43 serving as a hollow bottle with an enlarged diameter base (upper part in the drawing) and a sharply pointed tip is fitted into these fitting holes 42, and is also screwed into the screw hole 41. It is fixed by a cylindrical hollow screw 44. The injection needle 43 has a distal end facing toward the lower surface of the upper mold 12 so that when the lower mold 13 and the upper mold 12 are closed, the injection needle 43 penetrates into the hollow core body 1 installed in the cavity 14 of the molding mold 11. It is protruded to a more suitable length.
そうして、成形にあたっては、まず、ポリエチレンまた
はポリプロピレンなどをプロー成形してなり予めプライ
マー処理された中空芯体１内に、プロー成形時の空気吹
込みピン跡３より、注射針４３の先端部の孔径よりも粒
径の大きい砂粒、ガラスピーズ、木粉あるいはプラスチ
ラック成形用ベレットなどの固体粒子３１を完全に充填
した後、空気吹込みピン跡３をシール体３２により塞ぐ
。In the molding process, first, the tip of the injection needle 43 is inserted into the hollow core body 1 which is made of polyethylene or polypropylene and has been pretreated with a primer. After completely filling with solid particles 31 such as sand grains, glass peas, wood flour, or pellets for plasticac molding having a particle size larger than the pore size of the hole, the air blowing pin trace 3 is closed with a sealing body 32.
つぎに、中空芯体１を下型１３内に装着した後、上型１
２を移動させて第１図に示すように、成形用型１１を閉
じる。このとき、上型１２に設けられた注射針４３が中
空芯体１内に貴人される。この状態で、中空芯体１の内
部空間である中空部２と成形用型１１の外部空間とが、
注射針４３、中空ねじ４４およびねじ孔４１を介して連
通される。Next, after installing the hollow core body 1 into the lower mold 13, the upper mold 1
2 to close the mold 11 as shown in FIG. At this time, the injection needle 43 provided on the upper die 12 is inserted into the hollow core body 1. In this state, the hollow part 2, which is the internal space of the hollow core body 1, and the external space of the mold 11,
The injection needle 43 , the hollow screw 44 and the screw hole 41 communicate with each other.
つぎに、成形用型１１の内面と中空芯体１との間にウレ
タン原液を注入し、発泡させる。このような反応射出成
形におけるウレタン原液の反応熱により、中空芯体１は
、その内部に充填された固体粒子３１間に残留した空気
の膨張により膨らもうとするが、膨張した空気は、注射
針４３内を通って成形用型１１の外部空間へ放出される
ので、中空芯体１の膨張変形は完全に防止される。また
、中空芯体１内には固体粒子３１が充填されているので
、上述のように、中空芯体１内の空気が成形用型１１外
へ放出されても、ウレタン原液の発泡圧によって中空芯
体１が収縮変形することすなわち中空芯体１の各面が内
側へ凹むこともない。Next, a urethane stock solution is injected between the inner surface of the mold 11 and the hollow core 1 and foamed. Due to the reaction heat of the urethane stock solution in such reaction injection molding, the hollow core 1 tries to expand due to the expansion of the air remaining between the solid particles 31 filled inside, but the expanded air Since it passes through the needle 43 and is ejected into the external space of the mold 11, expansion and deformation of the hollow core body 1 is completely prevented. Furthermore, since the solid particles 31 are filled inside the hollow core 1, even if the air inside the hollow core 1 is released to the outside of the mold 11, the foaming pressure of the urethane stock solution will cause the hollow The core body 1 does not shrink and deform, that is, each surface of the hollow core body 1 does not dent inward.
その後、ウレタン発泡体２１がある程痕冷却、硬化した
ところで、成形用型１１が開かれ、一体となった中空芯
体１とウレタン発泡体２１とが離型される。Thereafter, when the urethane foam 21 has been sufficiently cooled and hardened, the mold 11 is opened and the integrated hollow core 1 and urethane foam 21 are released from the mold.
そして、ウレタン発泡体２１が冷却、硬化する過程にお
いて、中空芯体１内の固体粒子３１間の空気も冷却され
て収縮するが、この固体粒子３１によって中空芯体１の
収縮変形は防止される。なお、固体粒子３１間の空気の
冷却に伴い、注射針４３を介しであるいはこの注射針４
３を抜いた後に生じる貫通孔５１を介して、外部から中
空芯体１内に空気が流入する。また、上述のように、ウ
レタン原液の反応熱による中空芯体１の膨張変形が防止
されたことにより、ウレタン発泡体２１の冷却、硬化に
際して、中空芯体１がその復元力によって収縮変形する
ようなこともない。したがって、ウレタン発泡体２１の
外側の各面に凹みが生じることはない。In the process of cooling and hardening the urethane foam 21, the air between the solid particles 31 in the hollow core 1 is also cooled and contracts, but the solid particles 31 prevent the hollow core 1 from shrinking and deforming. . In addition, as the air between the solid particles 31 cools, the injection needle 43 or the injection needle 4
Air flows into the hollow core body 1 from the outside through the through hole 51 formed after the core body 3 is removed. Furthermore, as described above, since expansion and deformation of the hollow core 1 due to the reaction heat of the urethane stock solution is prevented, the hollow core 1 is prevented from contracting and deforming due to its restoring force when the urethane foam 21 is cooled and hardened. Nothing. Therefore, no dents are formed on the outer surfaces of the urethane foam 21.
さらに、冷却、硬化の完了後、第２図に示すように、外
観上差し支えのない被取付体たとえば車両への取付面（
図示上面）側において、ウレタン発泡体２１および中空
芯体１に排出孔５２を開口形成し、中空芯体１内より固
体粒子３１を排出さけることにより、中空芯体１のほぼ
全周をウレタン発泡体２１で覆ってなる中空ウレタン発
泡成形品２２を得る。このように、中空芯体１内の固体
粒子３１はＲ終的に除去されるので、軽量な中空ウレタ
ン発泡成形品２２となる。なお、取出された固体粒子３
１は、その後再使用される。Furthermore, after cooling and curing are completed, as shown in FIG.
On the (upper surface shown in the figure) side, a discharge hole 52 is formed in the urethane foam 21 and the hollow core 1 to prevent solid particles 31 from being discharged from inside the hollow core 1, so that almost the entire circumference of the hollow core 1 is covered with urethane foam. A hollow urethane foam molded product 22 covered with a body 21 is obtained. In this way, the solid particles 31 within the hollow core body 1 are eventually removed, resulting in a lightweight hollow urethane foam molded product 22. In addition, the extracted solid particles 3
1 is then reused.
こうして、上記方法によれば、外側の各面が平らな所定
の形状通りの中空ウレタン発泡成形品２２を確実に得る
ことができる。Thus, according to the above method, it is possible to reliably obtain a hollow urethane foam molded product 22 having a predetermined shape and having each flat outer surface.
なお、注射針４３をｗＵ設するかわりに、シール休３２
として通気性ネットを用い、そのネット外周をシール材
で取り囲むとともに、空気吹込みビン跡３に対向する型
キャビティ面を焼結金属で構成することにより、中空芯
体１の内部空間と型外空間とを連通させてもよい。In addition, instead of installing the injection needle 43 wU, the seal 32
By using an air-permeable net and surrounding the outer periphery of the net with a sealing material, and by configuring the mold cavity surface facing the air blowing bottle trace 3 with sintered metal, the inner space of the hollow core 1 and the outer space of the mold are separated. may be communicated with.
本発明によれば、固体粒子を充填した中空芯体の内部空
間と成形用型の外部空間とを連通させた状態でウレタン
を発泡硬化させるので、ウレタン原液の発泡圧による中
空芯体の収縮変形を防止できるのみならず、固体粒子間
に残留しウレタン原液の反応熱によって膨張した空気が
成形用型外に流出することにより、中空芯体の膨張変形
も防止でき、また、冷却、硬化時の中空芯体の収縮変形
も防止でき、したがって、所定の形状の中空ウレタン発
泡成形品を得ることができる。According to the present invention, since the urethane is foamed and cured while the internal space of the hollow core filled with solid particles is communicated with the external space of the mold, the hollow core undergoes shrinkage and deformation due to the foaming pressure of the urethane stock solution. Not only can this prevent the expansion and deformation of the hollow core by allowing the air remaining between the solid particles and expanded by the reaction heat of the urethane stock solution to flow out of the mold, it also prevents the expansion and deformation of the hollow core during cooling and curing. Shrinkage and deformation of the hollow core can also be prevented, and therefore a hollow urethane foam molded product with a predetermined shape can be obtained.
第１図および第２図は本発明の中空ウレタン発泡成形品
の製造方法の一実施例を示すもので、第１図はウレタン
発泡体の成形時の断面図、第２図は製造された中空ウレ
タン発泡成形品の断面図である。また、第３図ないし第
８図は従来の中空ウレタン発泡成形品の製造方法の一例
を示すもので、第３図は中空芯体の平面図、第４図は第
３図のｒＶ−ＩＶ断面図、第５図は中空芯体を成形用型
内に装着した状態の一部を切り欠いた平面図、第６図は
第５図のＶｌ−Ｖｌ断面図、第７図はウレタン発泡体の
成形時の断面図、第８図は製造された中空ウレタン発泡
成形品の断面図である。さら′に、第９図ないし第１１
図は従来の中空ウレタン発泡成形品のＩＩ造方法の他の
例を示すもので、第９図は中空芯体の断面図、第１０図
はウレタン発泡体の成形時の断面図、第１１図は製造さ
れた中空ウレタン発泡成形品の断面図である。
１・・中空芯体、１１・・成形用型、１４・・キャビテ
ィ、２１・・ウレタン発泡体、２２・・中空ウレタン発
泡成形品、３１・・固体粒子、４３・・中空ビンとして
の注射針。Figures 1 and 2 show an embodiment of the method for producing a hollow urethane foam molded product of the present invention. FIG. 2 is a cross-sectional view of a urethane foam molded product. In addition, Figures 3 to 8 show an example of a conventional manufacturing method for a hollow urethane foam molded product. Figure 3 is a plan view of a hollow core, and Figure 4 is a cross section along rV-IV in Figure 3. Figure 5 is a partially cutaway plan view of the hollow core mounted in the mold, Figure 6 is a sectional view taken along line Vl-Vl in Figure 5, and Figure 7 is a cross-sectional view of the urethane foam. FIG. 8 is a cross-sectional view of the manufactured hollow urethane foam molded product. Furthermore, Figures 9 to 11
The figures show another example of the conventional II manufacturing method for hollow urethane foam molded products, in which Fig. 9 is a cross-sectional view of a hollow core, Fig. 10 is a cross-sectional view of the urethane foam during molding, and Fig. 11. is a cross-sectional view of the manufactured hollow urethane foam molded product. 1. Hollow core body, 11. Molding mold, 14. Cavity, 21. Urethane foam, 22. Hollow urethane foam molded product, 31. Solid particle, 43. Syringe needle as hollow bottle. .
Claims (2)
た中空芯体を成形用型内に装着し、ウレタン反応射出成
形によつて前記中空芯体のほぼ全周をウレタン発泡体で
覆つてなる中空ウレタン発泡成形品を得るにあたつて、 前記中空芯体の内部空間と前記成形用型の外部空間とを
連通させた状態でウレタンを発泡硬化させることを特徴
とする中空ウレタン発泡成形品の製造方法。(1) A hollow core body made of synthetic resin and filled with solid particles is installed in a mold, and almost the entire circumference of the hollow core body is covered with urethane foam by urethane reaction injection molding. In obtaining a hollow urethane foam molded product, the hollow urethane foam molded product is characterized in that urethane is foamed and hardened while the internal space of the hollow core body and the external space of the mold are in communication with each other. manufacturing method.
ティと成形用型の外部空間とを連通する中空ビンを型閉
時に前記中空芯体に貫入させてこの中空芯体の内部空間
と前記成形用型の外部空間とを連通させることを特徴と
する特許請求の範囲第１項記載の中空ウレタン発泡成形
品の製造方法。(2) A hollow bottle provided in the mold and communicating between the cavity in the mold and the external space of the mold is inserted into the hollow core when the mold is closed, and the hollow bottle is connected to the internal space of the hollow core. 2. The method for producing a hollow urethane foam molded product according to claim 1, wherein the mold is communicated with an external space of the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62317114A JPH0761666B2 (en) | 1987-12-15 | 1987-12-15 | Method for manufacturing hollow urethane foam molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62317114A JPH0761666B2 (en) | 1987-12-15 | 1987-12-15 | Method for manufacturing hollow urethane foam molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01157824A true JPH01157824A (en) | 1989-06-21 |
| JPH0761666B2 JPH0761666B2 (en) | 1995-07-05 |
Family
ID=18084594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62317114A Expired - Lifetime JPH0761666B2 (en) | 1987-12-15 | 1987-12-15 | Method for manufacturing hollow urethane foam molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0761666B2 (en) |
-
1987
- 1987-12-15 JP JP62317114A patent/JPH0761666B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0761666B2 (en) | 1995-07-05 |
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