JP2786522B2 - Plastic hollow molded article and molding method - Google Patents
Plastic hollow molded article and molding methodInfo
- Publication number
- JP2786522B2 JP2786522B2 JP15589190A JP15589190A JP2786522B2 JP 2786522 B2 JP2786522 B2 JP 2786522B2 JP 15589190 A JP15589190 A JP 15589190A JP 15589190 A JP15589190 A JP 15589190A JP 2786522 B2 JP2786522 B2 JP 2786522B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow
- gas
- gas injection
- hole
- cavity
- 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 - Fee Related
Links
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)
Description
【発明の詳細な説明】 （産業上の利用分野） 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 Field) The present invention relates to a plastic hollow molded article in which a high-pressure gas is injected into an injected molten plastic and solidified to form a hollow portion, and a molding method thereof. The present invention also relates to a hollow molded body which prevents deformation due to a change in outside air temperature and has an improved drainage capacity, and a molding method therefor.
（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が知られている。すなわ
ち金型のキャビティ内に溶融プラスチックを充填し、こ
の溶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して形成しようと
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、し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 has been known a molding method in which a hollow portion is formed by using a high-pressure gas during injection molding of plastic. That is, a molten plastic is filled in a cavity of a mold, and a gas such as nitrogen gas at a high pressure is injected into the molten plastic to form a gas occupying space as a hollow portion. In the hollow molded body formed by such a method, a passage at the time of gas injection is formed as a gas injection hole. However, such a gas injection hole has a risk of intrusion of water or the like, and furthermore, an aesthetic appearance of the product. In many cases, it will eventually be blocked because it impairs.
（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したりし
て製品の外形形状に変化をきたす等の不具合があった。(Problems to be Solved by the Invention) However, when the hollow portion is sealed in this way, the hollow portion expands or contracts due to a change in outside air temperature, and the outer shape of the product changes. There was a defect.
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 a vent is provided for ventilation, it is necessary to sufficiently consider drainage.
（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け
た。(Means for Solving the Problems) In order to solve the problems, the present invention has provided through holes facing each other across the hollow portion at the position of the gas injection hole of the hollow molded body.
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, at the time of forming the plastic hollow molded body, a hollow projecting portion which projects outward is formed opposite to the position of the gas injection hole. A part of the protruding part was removed.
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、キャビティ内に向け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。Further, in the second method, a projection protruding into the cavity is provided facing the position of the gas injection nozzle of the mold, and a through hole is formed in the cavity by the projection.
（作用） 通し孔とガス注入孔によって中空部が外気と連通し、
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、いずれ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。(Operation) The hollow portion communicates with the outside air through the through hole and the gas injection hole,
The product does not deform even if the humidity changes. At this time, by making the position of the through hole opposite to the position of the gas injection hole, water or the like that has entered through one of the holes escapes from the other hole as it is, and the drainage property is improved. The high-pressure gas injected from the hole acts directly on the hollow overhang, and the formation of the hollow is reliable and easy.
又第２方法においては、ガス注入孔から注気される高
圧ガスが突起に向け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となる。Further, in the second method, since the high-pressure gas injected from the gas injection hole is directly blown toward the projection, the formation of the through hole can be reliably and easily performed.
（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) An example of a plastic hollow molded article and a molding method of the present invention will be described with reference to the accompanying 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。1 and 2 are explanatory views of a first molding method of the present invention. FIG. 1 is a mold structure, FIG. 2 is a partially enlarged view of a hollow molded body, and FIG. FIG. 3 is a partially enlarged view showing a molding method of No. 2;
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が設けられてい
る。The first molding method of the present invention will be described. As shown in FIG. 1, a cavity 3 is formed on a mating surface of an upper mold 1 and a lower mold 2, and the upper mold 1 has a cavity 3 in the cavity 3. An injection unit 4 for filling plastic is provided.
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に取り付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、ピン10を
一体的に設け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
して前述のピン10は、上動時にガス注入ノズル14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。又上動時にはピン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 a high-pressure gas into the filled molten plastic,
For example, a guide member 9 and a pin 10 are integrally provided above a piston 8 that slides up and down in a hydraulic cylinder 7 attached to the lower die 2 to constitute a gas injection mechanism. That is, the gas passage 12 is provided in the small-diameter portion space 11 where the guide member 9 slides.
A gas injection nozzle 14 is formed between the small-diameter portion space 11 and the cavity 3 as a communication hole. When the pin 10 moves upward, it slides on the gas injection nozzle 14 to shut off the gas injection nozzle 14, and moves downward to open the gas injection nozzle 14. In addition, the tip of the pin 10 can reach 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が挟
んだ対向側の上型１には凹部15が設けられている。そし
てこの凹部15によって、以下に述べる中空成形体16の張
出部を形成する。On the other hand, a concave portion 15 is provided in the upper mold 1 on the side opposite to the gas injection nozzle 14 with the cavity 3 interposed therebetween. The recess 15 forms an overhang of the hollow molded body 16 described below.
すなわち、かかる金型装置のキャビティ３内に溶融プ
ラスチックが充填されると、注入部５のピストン８が油
圧作動により上昇する。そしてピン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、当初ピン10によりあけ
られた孔は、ガス注入孔18として形成される。That is, when the molten plastic is filled in the cavity 3 of the mold apparatus, the piston 8 of the injection section 5 is raised by hydraulic operation. When a hole is made in the surface of the molten plastic in the cavity 3 at the tip of the pin 10, 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 inside of the molten plastic through the holes on the surface thereof, and forms a hollow portion 17 as shown in FIG. At the same time, the hole initially formed by the pin 10 is formed as a gas injection hole 18.
一方前述の上型１の凹部15には、中空張出部20が形成
される。そし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線でカットして通し孔21を形成する。On the other hand, a hollow projection 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, the inside of the overhang can be reliably made hollow. Then, the hollow molded body 16 is formed by solidification while maintaining a constant gas pressure, and after the mold is released, the hollow overhang portion 20 is cut along the line A 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14の位置に対向して、上
型１からキャビティ内に向け突出する突起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、
次いで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から逃げだすこと
が出来るため、排水性が良い。FIG. 3 shows a second molding method of the present invention. In the case of this mold, a projection 22 projecting from the upper mold 1 into the cavity is provided opposite to the position of the gas injection nozzle 14 of the lower mold 2. Have been. The tip of the projection 22 is sharp. Such a cavity is filled with molten plastic,
Next, when a high-pressure gas is injected in the same procedure as described above, a hollow portion is formed and a projection on which the high-pressure gas acts directly.
No pressure layer is formed on 22, and a through hole 24 can be provided in the hollow molded body 23. The through holes 21 and 24 of the hollow molded bodies 16 and 23 formed as described above and the gas injection nozzle 14 allow the hollow portion 17 to communicate with the outside air so that the product is distorted even when the humidity of the outside air changes. There is no. Also, even if rainwater or the like enters through the through holes 21 and 24, it can escape from the gas injection hole 18 as it is, so that drainage is good.
（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。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。(Effect of the Invention) As described above, the plastic hollow molded article of the present invention can prevent a problem such as deformation of a product due to a change in outside air temperature with a very simple configuration, and can improve drainage in the hollow portion. I can do it. In addition, since the injection gas pressure is used for the through hole forming portion in the molding method, the drilling operation 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、16,23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。1 and 2 are explanatory views of a first molding method of the present invention. FIG. 1 is a mold structure, FIG. 2 is a partially enlarged view of a hollow molded body, and FIG. FIG. 3 is a partially enlarged view showing a molding method of No. 2; In the figure, 3 is a cavity, 5 is an injection part, 12 is a gas passage, 14 is a gas injection nozzle, 16 and 23 are hollow molded bodies, 18 is a gas injection hole, 20 is a hollow overhang, and 21 and 24. Indicates a through hole, and 22 indicates a protrusion.
フロントページの続き (72)発明者 田中 広巳 埼玉県狭山市新狭山１丁目10番地１ ホ ンダエンジニアリング株式会社内 (72)発明者 狩野 健二郎 埼玉県狭山市新狭山１丁目10番地１ ホ ンダエンジニアリング株式会社内 (56)参考文献 特開 平３−248937（ＪＰ，Ａ) 特開 平３−219551（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00 - 45/84 B29L 22:00 B29C 49/06Continued on the front page (72) Inventor Hiromi Tanaka 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Kenjiro Kano 1-10-1 Shinsayama, Sayama City, Saitama Honda Engineering Stock In-house (56) References JP-A-3-248937 (JP, A) JP-A-3-219551 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B29C 45/00- 45/84 B29L 22:00 B29C 49/06
Claims (3)
注入し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. A plastic hollow molded body having a hollow portion formed by injecting a gas into a molten plastic during injection molding, the hollow molded body includes a gas injection hole formed at the time of gas injection and a gas injection hole formed at the gas injection hole. A plastic molded body having through holes facing each other across a hollow portion.
射出し、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 hollow molding method in which molten plastic is injected into a cavity of a mold and a gas is injected into the molten plastic to form a hollow portion. Occasionally, a hollow overhang is formed to project outward, facing the position of the gas injection hole into which the gas has been injected, and a part of this hollow overhang is cut off after release to form a through hole. A method for molding a hollow molded article, characterized in that:
射出し、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. A hollow molding method in which a molten plastic is injected into a cavity of a mold, and a gas is injected into the molten plastic from a gas injection nozzle to form a hollow portion. A method for forming a hollow molded body, comprising: a projection that projects into a cavity facing a position of a gas injection nozzle, and the projection 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 JPH0445909A (en) | 1992-02-14 |
| JP2786522B2 true 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 |
|---|---|
| JPH0445909A (en) | 1992-02-14 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |