JPH0437511A - Method fro forming hollow plastic molded body - Google Patents
Method fro forming hollow plastic molded bodyInfo
- Publication number
- JPH0437511A JPH0437511A JP14416190A JP14416190A JPH0437511A JP H0437511 A JPH0437511 A JP H0437511A JP 14416190 A JP14416190 A JP 14416190A JP 14416190 A JP14416190 A JP 14416190A JP H0437511 A JPH0437511 A JP H0437511A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- hollow
- molded body
- mold temperature
- neighborhood
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 4
- 239000000498 cooling water Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 21
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000071 blow moulding Methods 0.000 description 2
- 238000001746 injection moulding 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
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
-
- 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
-
- 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
- B29C2045/1717—Temperature controlled mould parts to control the location or configuration of the hollow
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7337—Heating or cooling of the mould using gas or steam
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)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は射出成形によってプラスチック成形体を成形し
、この際成形体内部にガスを注入して中空部を形成する
ような中空成形法の改良に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is an improvement of the blow molding method in which a plastic molded body is molded by injection molding, and at this time, gas is injected into the molded body to form a hollow part. Regarding.
（従来の技術）
従来、中空部を有するプラスチック製品を製造するよう
な場合、射出金型のキャビティに溶融プラスチックを充
填し、次いで溶融プラスチック内に高圧ガスを注入して
、ガス占有空間部を中空部として成形するような成形法
が知られている。(Prior art) Conventionally, when manufacturing plastic products with hollow parts, the cavity of an injection mold is filled with molten plastic, and then high-pressure gas is injected into the molten plastic to make the space occupied by the gas hollow. A molding method is known in which it is molded as a part.
（発明が解決しようとするｉ！！！り
しかし従来の場合、例えば製品が大型化するような場合
には、キャビティ内に溶融プラスチックを充填している
最中にも既にキャビティ端部付近等では凝固が始ってお
り、充填完了後ガスを注入する時点ではガス占有面積が
制御され有効な面積の中空部を作り得なかった。そして
この場合中空部形成が不充分な肉、１１部ではヒケを生
じるという問題もあった。(The problem that the invention aims to solve) However, in the conventional case, for example when the product becomes large, even when the cavity is being filled with molten plastic, the area near the end of the cavity has already been removed. Solidification had begun, and when the gas was injected after filling was completed, the area occupied by the gas was controlled and a hollow part with an effective area could not be created.In this case, the hollow part was insufficiently formed, and in part 11 there was a sink. There was also the problem of causing
一方所定のガス圧をキャビティ全域に亘って確保しよう
とするとすると、ガス注入部を数多く設ける必要があり
装置が複雑化するという問題もあった。On the other hand, if a predetermined gas pressure is to be ensured throughout the cavity, it is necessary to provide a large number of gas injection parts, resulting in a problem that the apparatus becomes complicated.
（ｉｌ！題を解決するための手段）
かかるｉＩＮを解決するため、本発明は金型のプラスチ
ック射出部とは異なる位置のガス注入部からガスを注入
するようにした中空成形方法において、中空部を形成す
るキャビティ周囲の型温を他のキャビティ周囲の型温よ
り高めながら成形するようにした。(Means for Solving the Problem) In order to solve the iIN problem, the present invention provides a blow molding method in which gas is injected from a gas injection part located at a position different from the plastic injection part of the mold. The mold temperature around the cavity forming the mold is made higher than the mold temperature around other cavities during molding.
又、中空部のうち中空面積の大きい部分のみ型温を高め
るようにした。In addition, the mold temperature is increased only in the hollow area where the hollow area is large.
（作用）
中空部を形成するキャビティ周囲の型温を高めることに
より、同部の溶融プラスチックの溶融状態が維持され、
ガス圧が均一に作用して中空部の面積を大きく形成する
ことが出来る。(Function) By increasing the mold temperature around the cavity that forms the hollow part, the molten state of the molten plastic in the same part is maintained,
The gas pressure acts uniformly, and the area of the hollow portion can be formed to be large.
又温度の制御によって中空部の大きさを任意に設定する
ことが出来、薄肉にして軽量化したい場合、或いは厚肉
にして剛性を得たい場合等の製作の自由度が増す。Furthermore, the size of the hollow part can be arbitrarily set by controlling the temperature, which increases the degree of freedom in manufacturing, such as when it is desired to reduce the weight by making the wall thin or to obtain rigidity by making the wall thick.
（実施例）
本発明の中空成形体の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 the method for molding a hollow molded body of the present invention will be described based on the attached drawings.
′ｓ１図は本発明の成形方法を説明するための金型構造
を示し、第２図は中空成形体一部を示す断面図である。Fig. 's1 shows a mold structure for explaining the molding method of the present invention, and Fig. 2 is a sectional view showing a part of the hollow molded body.
ｚｉ図に示すように射出成形金型の上型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にはキャビ
ティ３内に溶融プラスチックを射出する射出部としての
射出ノズル４が設けられている。As shown in Figure zi, a cavity 3 is formed on the mating surfaces of the upper mold 1 and lower mold 2 of the injection molding die, and the upper mold 1 has an injection nozzle as an injection part that injects molten plastic into the cavity 3. 4 are provided.
一方、下型２には充填された溶融プラスチック内に窒素
ガス等の高圧ガスを注入するガス注入部６が設けられて
おり、このガス注入部６は例えば油圧駆動の油圧シリン
ダユニット７を設けて、ガスの注入を行なうべく構成し
ている。すなわち、この油圧シリンダユニット７の上下
動自在なピストン８にはビン９が一体的に設けられ、こ
のビン９は、キャビティ３に向けて開口する下型２の連
通孔１０を貫いてキャビティ３内に出没自在とされてい
る。又この連通孔１０にはガス通路１２が連通している
。On the other hand, the lower mold 2 is provided with a gas injection part 6 for injecting high pressure gas such as nitrogen gas into the filled molten plastic, and this gas injection part 6 is provided with, for example, a hydraulic cylinder unit 7 driven by hydraulic pressure. , and is configured to perform gas injection. That is, a bottle 9 is integrally provided on a vertically movable piston 8 of this hydraulic cylinder unit 7, and this bottle 9 passes through a communication hole 10 of the lower mold 2 that opens toward the cavity 3 and is inserted into the cavity 3. It is said that it can be found anywhere. Further, a gas passage 12 communicates with this communication hole 10.
このため油圧シリンダユニット７のピストン８の上動に
よフて、ビン９先端は充填されたキャビティ３内の溶融
プラスチック外表面に孔をあけ、次いでピストン８の降
下によって連通孔１０を連通させて、ガス通路１２から
の高圧ガスを溶融プラスチック内に注入せしめる。Therefore, by the upward movement of the piston 8 of the hydraulic cylinder unit 7, the tip of the bottle 9 makes a hole in the outer surface of the molten plastic in the filled cavity 3, and then by the downward movement of the piston 8, the communicating hole 10 is communicated. , high pressure gas from gas passage 12 is injected into the molten plastic.
かかる金型構造は、従来周知のものであるが、本発明に
よると、中空部を形成するキャビティ３周囲にヒータ部
１３を設けている。このヒータ部１３は、例えば、通常
冷却用として用いる冷水通路に温水又は蒸気或は昇温し
た油を流すように構成し通常であれば２０℃から４０℃
に保つ金型温度のうち、ヒータ部１３のみの型温を８０
℃〜１５０℃位に保つようにする。又温度を制御するた
めの温度センサ１４を設ける。Such a mold structure is conventionally known, but according to the present invention, a heater section 13 is provided around the cavity 3 forming a hollow section. This heater section 13 is configured, for example, to flow hot water, steam, or heated oil into a cold water passage normally used for cooling.
Of the mold temperature kept at 80%, the mold temperature of only the heater part 13 is
Try to keep it between 150℃ and 150℃. A temperature sensor 14 is also provided to control the temperature.
そしてキャビティ３内に溶融プラスチックを射出する際
に、同ヒータ部１３の金型温度を昇温しておき、充填後
高圧ガスを注入すると、′ｓ２図のような超薄肉で且つ
中空面積の大きな中空成形体１５が得られる。尚型温を
上述のような諸元に設定して製作した結果、従来では得
ることの出来なかった約３＋ｎｍから１ｍｍの肉厚を有
する中空成形体が形成出来ることが確認されている。When injecting molten plastic into the cavity 3, the temperature of the mold in the heater section 13 is raised and high pressure gas is injected after filling, resulting in an ultra-thin wall and a hollow area as shown in Figure 's2. A large hollow molded body 15 is obtained. It has been confirmed that, as a result of manufacturing by setting the mold temperature to the above-mentioned specifications, it is possible to form a hollow molded body having a wall thickness of approximately 3+ nm to 1 mm, which was previously impossible to obtain.
以上のようなヒータ部１３は、中空面積の大きい中空部
のキャビティまわりにのみ設けるようにしても良い、そ
してかかる場合は、同部の肉厚が任意に且つ簡易に調整
出来ることとなり、製品製作の自由度が増す。The heater part 13 as described above may be provided only around the cavity of the hollow part with a large hollow area, and in such a case, the wall thickness of the part can be arbitrarily and easily adjusted, making it easier to manufacture the product. The degree of freedom increases.
（発明の効果）
以上のように本発明の中空成形体の成形法は、中空部を
形成するキャビティ周囲の金型温度を高めるようにした
ため、従来内厚が不均一であった中空成形体の中空部肉
厚を均一に薄肉とすることが出来、ヒケが発生すること
もなく品質を向上させることが出来る。又高圧ガスの圧
力をむやみに高める必要がないという効果もある。(Effects of the Invention) As described above, the method for molding a hollow molded body of the present invention increases the mold temperature around the cavity that forms the hollow part, so it is possible to The thickness of the hollow part can be made uniformly thin, and the quality can be improved without causing sink marks. Another advantage is that there is no need to increase the pressure of high-pressure gas unnecessarily.
更に型温の調整によって容易に肉厚を変えることが出来
るので製品の製作自由度が増大する。Furthermore, the wall thickness can be easily changed by adjusting the mold temperature, increasing the degree of freedom in manufacturing the product.
第１図は本発明の成形方法を説明するための金型構造、
第２図は中空成形体の一部を示す断面図である。
尚、同図中、３はキャビティ、４は射出ノズル、６はガ
ス注入部、１２はガス通路、１３はヒータ部、１５は中
空成形体を示す。FIG. 1 shows a mold structure for explaining the molding method of the present invention.
FIG. 2 is a sectional view showing a part of the hollow molded body. In the figure, 3 is a cavity, 4 is an injection nozzle, 6 is a gas injection part, 12 is a gas passage, 13 is a heater part, and 15 is a hollow molded body.
Claims (2)
融プラスチックを射出し、次いで該プラスチック射出部
とは異なる位置のガス注入部からプラスチック内部にガ
スを注入して中空成形体を成形するようにした成形方法
において、 この方法は中空部を形成するキャビティ周囲の型温を他
のキャビティ周囲の型温より高めながら成形するように
したことを特徴とするプラスチック中空成形体の成形方
法。(1) Molten plastic is injected into the cavity from the plastic injection part of the mold, and then gas is injected into the plastic from a gas injection part located at a position different from the plastic injection part to form a hollow molded body. 1. A method for molding a plastic hollow molded article, characterized in that molding is performed while the mold temperature around a cavity forming a hollow part is higher than the mold temperature around other cavities.
ィ周囲のみ高めるようにしたことを特徴とする請求項第
１の記載のプラスチック中空成形体の成形方法。(2) The method for molding a plastic hollow molded article according to claim 1, wherein the mold temperature is increased only around a cavity of a hollow portion having a large hollow area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14416190A JPH0437511A (en) | 1990-06-01 | 1990-06-01 | Method fro forming hollow plastic molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14416190A JPH0437511A (en) | 1990-06-01 | 1990-06-01 | Method fro forming hollow plastic molded body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0437511A true JPH0437511A (en) | 1992-02-07 |
Family
ID=15355621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14416190A Pending JPH0437511A (en) | 1990-06-01 | 1990-06-01 | Method fro forming hollow plastic molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437511A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996016783A1 (en) * | 1994-11-25 | 1996-06-06 | Asahi Kasei Kogyo Kabushiki Kaisha | Improved injection molding method for producing resin blow molded article and mold used for said method |
| JP2008253896A (en) * | 2007-04-03 | 2008-10-23 | Roki Co Ltd | Fluid filter |
| US7767084B2 (en) | 2005-07-21 | 2010-08-03 | Nok Corporation | Oil strainer |
-
1990
- 1990-06-01 JP JP14416190A patent/JPH0437511A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996016783A1 (en) * | 1994-11-25 | 1996-06-06 | Asahi Kasei Kogyo Kabushiki Kaisha | Improved injection molding method for producing resin blow molded article and mold used for said method |
| US5902541A (en) * | 1994-11-25 | 1999-05-11 | Asahi Kasei Kogyo Kabushiki Kaisha | Injection molding method for producing shaped, hollow resin articles, and mold for use therein |
| US7767084B2 (en) | 2005-07-21 | 2010-08-03 | Nok Corporation | Oil strainer |
| JP2008253896A (en) * | 2007-04-03 | 2008-10-23 | Roki Co Ltd | Fluid filter |
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