JPH0445909A - Plastic hollow molded body and molding method - Google Patents
Plastic hollow molded body and molding methodInfo
- Publication number
- JPH0445909A JPH0445909A JP15589190A JP15589190A JPH0445909A JP H0445909 A JPH0445909 A JP H0445909A JP 15589190 A JP15589190 A JP 15589190A JP 15589190 A JP15589190 A JP 15589190A JP H0445909 A JPH0445909 A JP H0445909A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- hollow
- section
- gas injection
- molded body
- 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
- 238000000034 method Methods 0.000 title claims description 18
- 238000000465 moulding Methods 0.000 title claims description 12
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 238000001746 injection moulding Methods 0.000 claims description 2
- 238000000071 blow moulding Methods 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract 3
- 229920005989 resin Polymers 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 39
- 230000007547 defect Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分！ｔ！］’）
本発明は、射出した溶融プラスチック内に高圧ガスを注
入して凝固させ、中空部を形成するようにしたプラスチ
ック中空成形体及びその成形方法において、外気温の変
化による変形を防止し、しかも排水能力を向上させた中
空成形体及びその成形方法に関する。Detailed Description of the Invention (Industrial Application! t!) The present invention provides a plastic hollow molded article in which a hollow portion is formed by injecting high-pressure gas into an injected molten plastic and solidifying the injected molten plastic. The present invention relates to a hollow molded body that prevents deformation due to changes in outside temperature and has improved drainage capacity, and a molding method thereof.
′（従来の技術）
従来、プラスチックの射出成形時に高圧ガスを用いて中
空部を形成するような成形法か知らねている。すなわち
金型のキャビティ内に熔融プラスチックを充填し、この
熔融プラスチック内に高圧にした窒素ガス等のガスを注
入して、ガス占有空間部を中空部と１ノで形成１ノよう
とするものである。そしてかかる方法で成形された中空
成形体には、ガス注入の際の通路がガス注入孔として形
成されるが、このようなガス注入孔は水等の侵入のおそ
れがあり、１ノかも製品の美的外観を損なうことから、
最終的に塞ぐ場合が多い。(Prior Art) Conventionally, there is no known molding method that uses high pressure gas to form a hollow part during plastic injection molding. In other words, the cavity of the mold is filled with molten plastic, and a high-pressure gas such as nitrogen gas is injected into the molten plastic to form a gas-occupied space with the hollow part. be. In the hollow molded body formed by this method, a passage for gas injection is formed as a gas injection hole, but such a gas injection hole has the risk of intrusion of water, etc., and may cause damage to the product. Because it spoils the aesthetic appearance,
It often ends up being blocked.
（発明が解決しようとする課題）
しかし、このように中空部を密封した場合、外気温の変
化によって中空部が膨張したり又は逆に収縮（）たりｌ
ノて製品の外形形状に変化をきたす等の不具合があった
。(Problem to be solved by the invention) However, when the hollow part is sealed in this way, the hollow part may expand or conversely contract due to changes in the outside temperature.
There were defects such as changes in the external shape of the product.
一方通気のため通気孔を設けるような場合には、排水性
についても充分考慮する必要があった。On the other hand, when providing ventilation holes for ventilation, sufficient consideration must be given to drainage properties.
（課題を解決するための手段）
かかる課題を解決するため、本発明は中空成形体のガス
注入孔の位置に中空部を挟んで対向する通し孔を設りた
。(Means for Solving the Problem) In order to solve the problem, in the present invention, a through hole is provided at the position of the gas injection hole of the hollow molded body, and is opposed to the gas injection hole with the hollow portion interposed therebetween.
そして通し孔の形成のため、第１方法ではプラスチック
中空成形体の形成時に、ガス注入孔の位置に対向して、
外方に向けて張り出す中空張出部を形成し、離型後中空
張出部の一部を切除するようにした。In order to form the through hole, in the first method, when forming the plastic hollow molded body, the hole is placed opposite to the position of the gas injection hole.
A hollow projecting portion was formed to project outward, and a portion of the hollow projecting portion was removed after mold release.
又第２方法では、金型のガス注入ノズルの位置に対向し
て、キヤ貝パティ内に向は突出する突起を設け、この突
起によってキャビティ内で通し孔を形成するようにした
。In the second method, a protrusion is provided in the shell patty opposite to the position of the gas injection nozzle of the mold, and a through hole is formed in the cavity by this protrusion.
（作用）
ｉ１１Ｌ孔とガス注入孔によって中空部が外気ど連通し
、湿度変化があっても製品に変形をきたさない。この際
通し孔の位置をガス注入孔の位置に対向させることによ
り、いすねかの孔から侵入した水等は、そのまま他方の
孔から逃げ出し、排水性が向上するとともに、第１方法
では、ガス注入孔から注気される高圧ガスが、中空張出
部に直接作用して、中空部の形成が確実かつ容易となる
。(Function) The hollow part communicates with the outside air through the i11L hole and the gas injection hole, and the product does not deform even if there is a change in humidity. At this time, by arranging the position of the through hole to face the position of the gas injection hole, water etc. that entered through the hole in the hole escapes from the other hole, improving drainage performance. The high-pressure gas injected from the injection hole acts directly on the hollow projecting portion, making it possible to form the hollow portion reliably and easily.
又第２方法においては、ガス注入孔から注気さねる高圧
ガスが突起に向（って直接吹きつけられるため、通し孔
の形成が確実かつ容易どプ♂る。In the second method, the high-pressure gas injected from the gas injection hole is blown directly toward the protrusion, so that the through hole can be formed reliably and easily.
（実施例）
本発明のプラスチック中空成形体及び成形方法の実施例
について添付した図面に基づき説明する。(Example) Examples of the plastic hollow molded body and molding method of the present invention will be described based on the attached drawings.
第１図、第２図は本発明の第１の成形法の説明図であり
、第１図が金型構造、第２図が中空成形体の部分拡大図
、第３図は本発明の第２の成形法を示す部分拡大図であ
る。FIG. 1 and FIG. 2 are explanatory views of the first molding method of the present invention, in which FIG. 1 is a mold structure, FIG. 2 is a partially enlarged view of a hollow molded body, and FIG. 2 is a partially enlarged view showing molding method No. 2. FIG.
本発明の第１成形方法について説明すると、第１図に示
すように、上型１と下型２の型合せ面にはキャビティ３
が形成され、上型１には、このキャビティ３内に溶融プ
ラスチックを充填するための射出部４が設置・づられて
いる。To explain the first molding method of the present invention, as shown in FIG.
is formed, and an injection section 4 for filling the cavity 3 with molten plastic is installed and installed in the upper mold 1.
一方、下型２には、充填された溶融プラスチック内に高
圧ガスを注入するための注入部５が設けられており、例
えば下型２に取りイ」けられた油圧シリンダ７内で上下
に摺動するピストン８の上部にガイド部材９、ビン１０
を一体的に設りてガス注入機構を構成している。すなわ
ちガイド部材９が摺動する小径部空間１１には、ガス通
路１２が接続されており、又小径部空間１１とキャビテ
ィ３間にはガス注入ノズル１４が連通孔として穿孔され
ている。そして前述のビン１０は、上動時にガス注入ノ
ズル＋４に摺接して該ガス注入ノズル１４を遮断し、下
動してガス注入ノズル１４を開放する。又上動時にはビ
ン１０の先端部がキャビティ３内に臨むことが出来るよ
うにしている。On the other hand, the lower mold 2 is provided with an injection part 5 for injecting high pressure gas into the filled molten plastic. A guide member 9 and a bottle 10 are placed on the top of the moving piston 8.
are integrally provided to constitute a gas injection mechanism. That is, a gas passage 12 is connected to the small diameter space 11 in which the guide member 9 slides, and a gas injection nozzle 14 is bored as a communication hole between the small diameter space 11 and the cavity 3. Then, the aforementioned bottle 10 slides into contact with the gas injection nozzle +4 when moving upward to block the gas injection nozzle 14, and opens the gas injection nozzle 14 when moving downward. Further, the tip of the bottle 10 can be exposed to the inside of the cavity 3 during upward movement.
一方、このガス注入ノズル１４に対しキャビティ３を挟
んだ対向側の上型ゴには凹部１５が設けらねている。そ
してこの凹部１５によって、以下に述べる中空成形体１
６の張出部を形成する。On the other hand, a recess 15 is provided in the upper die on the opposite side of the gas injection nozzle 14 with the cavity 3 interposed therebetween. This recess 15 allows the hollow molded body 1 described below to
6 is formed.
すなわち、かかる金型装置のキャビティ３内に溶融プラ
スチックか充填されると、注入部５のピストン８が油圧
作動により上昇する。そしてビン１０先端でキャビティ
３内、の溶融プラスチックの表面に孔をあけるとピスト
ン８は下降してガス注入ノズル１４を開放する。このた
めガス通路１２から供給される高圧ガスは、溶融プラス
チック表面の孔から内部に入り込み、第２図に示すよう
に中空部１７を形成する。又これと共に、当初ビン１０
によりありらねた孔は、ガス注入孔１８として形成され
る。That is, when the cavity 3 of such a mold device is filled with molten plastic, the piston 8 of the injection part 5 is raised by hydraulic operation. When the tip of the bottle 10 makes a hole in the surface of the molten plastic in the cavity 3, the piston 8 descends to open the gas injection nozzle 14. For this reason, the high pressure gas supplied from the gas passage 12 enters the interior through the holes in the surface of the molten plastic, forming a hollow portion 17 as shown in FIG. Also, along with this, initially Bin 10
The hole formed by this process is formed as a gas injection hole 18.
方前述の上型１の凹部１５には、中空張出部２０が形成
される。そ１ノてこの張出内部には、ガス注入孔１８か
ら注入される高圧ガスが直接作用するため張出内部を確
実に中空にすることが出来る。そして一定のガス圧を保
持したまま凝固させて中空成形体１６を成形し、離型後
、中空張出部２０をＡ線でカッｌ−１，て通し孔２１を
形成する。A hollow protrusion 20 is formed in the recess 15 of the upper die 1 described above. Since the high pressure gas injected from the gas injection hole 18 acts directly on the inside of the overhang of the first lever, the inside of the overhang can be reliably made hollow. Then, the hollow molded body 16 is formed by solidifying while maintaining a constant gas pressure, and after releasing the mold, the hollow projecting portion 20 is cut l-1 with the A line to form the through hole 21.
第３図は本発明の第２の成形方法であり、この金型の場
合は下型２のガス注入ノズル＋４の位置に対向して、上
型１からキャビティ内に向１づ突出する突起２２が設け
られている。そしてこの突起２２の先端は尖鋭にしてい
る。このようなキャビティ内に溶融プラスチックが充填
され、次いて前記と同様の手順で高圧ガスを注入すると
、中空部が形成されるとともに、高圧ガスが直接作用す
る突起２２には肉圧層が形成されず、中空成形体２３に
通し孔２４を設けることができる。そして上述のように
形成された中空成形体１６．２３の通し孔２１．２４と
ガス注入ノズル１４は、中空部１７と外気を連通させ、
外気の湿度が変化しても製品が歪むような不具合がない
。又通し孔２１．２４から雨水等が侵入しても、そのま
まガス注入孔１８から逃げたずことが出来るため、排水
性が良い。FIG. 3 shows the second molding method of the present invention, and in this mold, a protrusion 22 protrudes from the upper mold 1 into the cavity, facing the position of the gas injection nozzle +4 of the lower mold 2. is provided. The tip of this protrusion 22 is made sharp. When such a cavity is filled with molten plastic and then high-pressure gas is injected in the same manner as described above, a hollow part is formed and a flesh pressure layer is formed on the protrusion 22 on which the high-pressure gas directly acts. First, through holes 24 can be provided in the hollow molded body 23. The through hole 21.24 of the hollow molded body 16.23 formed as described above and the gas injection nozzle 14 communicate the hollow part 17 with the outside air,
There are no defects such as product distortion even if the humidity of the outside air changes. Furthermore, even if rainwater or the like enters through the through holes 21, 24, it can escape directly from the gas injection hole 18, resulting in good drainage.
（発明の効果）
以上のように本発明のプラスチック中空成形体は、至っ
て簡易な構成によって、外気温の変化による製品の変形
といった不具合を防止し得、しかも中空部内の排水性を
向上させることが出来る。(Effects of the Invention) As described above, the plastic hollow molded article of the present invention has a very simple structure, can prevent defects such as deformation of the product due to changes in outside temperature, and can improve drainage performance in the hollow part. I can do it.
又成形方法についても通し孔形成部分に注入ガス圧を利
用するようにしているため、孔あけ作業が容易である。Also, regarding the forming method, since injection gas pressure is used in the through-hole forming portion, the hole-drilling work is easy.
第１図、第２図は本発明の第１の成形法の説明図であり
、第１図が金型構造、第２図が中空成形体の部分拡大図
、第３図は本発明の第２の成形法を示す部分拡大図であ
る。
尚、同図中、３はキャビティ、５は注入部、１２はガス
通路、１４はガス注入ノズル、１６２３は中空成形体、
１８はガス注入孔、２０は中空張出部、２１．２４は通
し孔、２２は突起を示す。FIG. 1 and FIG. 2 are explanatory views of the first molding method of the present invention, in which FIG. 1 is a mold structure, FIG. 2 is a partially enlarged view of a hollow molded body, and FIG. 2 is a partially enlarged view showing molding method No. 2. FIG. In addition, in the figure, 3 is a cavity, 5 is an injection part, 12 is a gas passage, 14 is a gas injection nozzle, 1623 is a hollow molded body,
18 is a gas injection hole, 20 is a hollow protrusion, 21.24 is a through hole, and 22 is a protrusion.
Claims (3)
て中空部を形成したプラスチック中空成形体において、
この中空成形体は、ガスの注入時に形成したガス注入孔
と、このガス注入孔に中空部を挟んで対向する通し孔を
備えたことを特徴とするプラスチック成形体。(1) In a plastic hollow molded body in which a hollow part is formed by injecting gas into molten plastic during injection molding,
This hollow molded body is a plastic molded body characterized by having a gas injection hole formed when gas is injected, and a through hole facing the gas injection hole with a hollow portion in between.
、この溶融プラスチック内にガスを注入して中空部を形
成するようにした中空成形方法において、この方法は、
プラスチック中空成形体の成形時に、ガスを注入したガ
ス注入孔の位置に対向して、外方に向けて張り出す中空
張出部を形成し、離型後この中空張出部の一部を切除し
て通し孔を形成するようにしたことを特徴とする中空成
形体の成形方法。(2) A blow molding method in which molten plastic is injected into the cavity of a mold and gas is injected into the molten plastic to form a hollow part.
When molding a plastic hollow molded body, a hollow protruding part is formed that protrudes outward, facing the position of the gas injection hole where gas is injected, and a part of this hollow protruding part is removed after the mold is released. A method for forming a hollow molded body, characterized in that a through hole is formed through the hollow molded body.
、この溶融プラスチック内にガス注入ノズルからガスを
注入して中空部を形成するようにした中空成形方法にお
いて、前記金型には、ガス注入ノズルの位置に対向して
キャビティ内に突出する突起が設けられ、この突起によ
ってキャビティ内で中空成形体に通し孔を形成するよう
にしたことを特徴とする中空成形体の成形方法。(3) In a blow molding method in which molten plastic is injected into a cavity of a mold, and gas is injected into the molten plastic from a gas injection nozzle to form a hollow part, the mold is injected with gas. A method for molding a hollow molded body, characterized in that a protrusion is provided that protrudes into the cavity opposite to the position of the nozzle, and the protrusion forms a through hole in the hollow molded body within the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15589190A JP2786522B2 (en) | 1990-06-14 | 1990-06-14 | Plastic hollow molded article and molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15589190A JP2786522B2 (en) | 1990-06-14 | 1990-06-14 | Plastic hollow molded article and molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0445909A true JPH0445909A (en) | 1992-02-14 |
| JP2786522B2 JP2786522B2 (en) | 1998-08-13 |
Family
ID=15615762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15589190A Expired - Fee Related JP2786522B2 (en) | 1990-06-14 | 1990-06-14 | Plastic hollow molded article and molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2786522B2 (en) |
-
1990
- 1990-06-14 JP JP15589190A patent/JP2786522B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2786522B2 (en) | 1998-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR890004847A (en) | Injection molding method and apparatus | |
| KR920014592A (en) | Injection Molding Method and Injection Molding Mold of Thermoplastic Resin | |
| JPH0430899B2 (en) | ||
| KR970061492A (en) | Method for producing a hollow molded body made of thermoplastic resin | |
| JPH0445909A (en) | Plastic hollow molded body and molding method | |
| KR930701279A (en) | Press molding die and press molding method of thermoplastic resin using the same | |
| JP3618700B2 (en) | Injection mold | |
| JP2012081713A (en) | Foam molding die | |
| ES2173522T3 (en) | PROCEDURE FOR THE FOUNDRY IN LOST MOLD AND FOUNDRY MOLD FOR THAT PROCEDURE. | |
| JPS6140167B2 (en) | ||
| KR950007993A (en) | Low pressure casting method and device | |
| JPH1158443A (en) | Insert molding method | |
| JPS599879Y2 (en) | FRP mold with degassing mechanism | |
| JP2558946Y2 (en) | Bathtub molding equipment | |
| JP2636988B2 (en) | Gas pressure mold | |
| CN219405078U (en) | Silica gel injection molding burr-proof and glue overflow-proof structure | |
| JPH049157Y2 (en) | ||
| JPS63281816A (en) | Mold assembly | |
| JP2004181635A (en) | Mold assembly for injection blow molding | |
| JPH0195007A (en) | Molding method for boss section of resin molded product | |
| JPH0361014A (en) | Injection mold | |
| JPH06122129A (en) | Press molding method | |
| JP2578279Y2 (en) | Ejector for mold | |
| JP3125468B2 (en) | Injection mold | |
| KR19990018247A (en) | Gate Cutting Device of Injection Molding Mold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |