JPH08258074A - Pressure gas supply device in hollow injection molding - Google Patents
Pressure gas supply device in hollow injection moldingInfo
- Publication number
- JPH08258074A JPH08258074A JP6040295A JP6040295A JPH08258074A JP H08258074 A JPH08258074 A JP H08258074A JP 6040295 A JP6040295 A JP 6040295A JP 6040295 A JP6040295 A JP 6040295A JP H08258074 A JPH08258074 A JP H08258074A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- pressurized gas
- gas supply
- pressure gas
- injection 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.)
- Granted
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
- B29C45/1732—Control circuits therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、中空射出成形におけ
る加圧ガス供給装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized gas supply device for hollow injection molding.
【０００２】[0002]
【従来の技術】金型に溶融した樹脂を射出した後、金型
中の成形品の内部に加圧ガスを導入して保圧を行う中空
射出成形は、従来より知られている（ＵＳＰ４１０６１
７参照）。この中空射出成形を行う装置は、図３に示す
ように、上下金型(31)(32)内に溶融した樹脂(33)を射出
するインジェクションノズル(34)と、加圧ガス(39)をイ
ンジェクションノズル(34)内に設けられた加圧ガス通路
(35)に導入するガス導入管(36)と、インジェクションノ
ズル(34)内に上下動自在に設けられかつ加圧ガス通路(3
5)の入口(35a) を開閉するエア作動弁(37)と、それぞれ
バルブ(42)(43)を有する２本のエア作動弁開閉用エア通
路(40)(41)とを備えており、金型(31)(32)が樹脂により
部分的に満たされたときに、エア作動弁(37)を開けて金
型(31)(32)中の成形品(38)の内部に加圧ガス(39)を導入
し、保圧を行うものである。2. Description of the Related Art Hollow injection molding, in which a molten resin is injected into a mold and then a pressurized gas is introduced into the molded product in the mold to hold the pressure, is conventionally known (USP41061).
7). As shown in FIG. 3, the apparatus for performing the hollow injection molding includes an injection nozzle (34) for injecting the molten resin (33) into the upper and lower molds (31) and (32) and a pressurized gas (39). Pressurized gas passage provided in the injection nozzle (34)
A gas introduction pipe (36) to be introduced into (35), and a pressurized gas passage (3) provided in the injection nozzle (34) so as to be vertically movable.
An air operated valve (37) for opening and closing the inlet (35a) of 5), and two air operated valve opening and closing air passages (40) (41) each having valves (42) (43) are provided. When the molds (31) (32) are partially filled with resin, the air actuated valve (37) is opened and pressurized gas is introduced inside the molded product (38) in the molds (31) (32). (39) is introduced to maintain the pressure.
【０００３】上記従来の中空射出成形装置において、加
圧ガスの圧力は、図示省略された加圧ガス供給装置の加
圧ガス圧力設定ラインに設けられた減圧弁により設定さ
れている。In the above conventional hollow injection molding apparatus, the pressure of the pressurized gas is set by a pressure reducing valve provided in a pressurized gas pressure setting line of a pressurized gas supply apparatus (not shown).
【０００４】[0004]
【発明が解決しようとする課題】上記従来の中空射出成
形装置では、成形品の形状が複雑になると、成形品の表
面に凹みが生じる等の不良が多くなるという問題があっ
た。The above-mentioned conventional hollow injection molding apparatus has a problem that when the shape of the molded product becomes complicated, defects such as dents on the surface of the molded product increase.
【０００５】この発明の目的は、成形品の不良を少なく
することができる中空射出成形における加圧ガス供給装
置を提供することにある。An object of the present invention is to provide a pressurized gas supply device in hollow injection molding which can reduce defects in molded products.
【０００６】[0006]
【課題を解決するための手段】この発明による中空射出
成形における加圧ガス供給装置は、金型に溶融した樹脂
を射出した後、金型中の成形品の内部に加圧ガスを導入
して保圧を行う中空射出成形に用いられる加圧ガス供給
装置であって、高圧ガスを減圧して所要の圧力の加圧ガ
スとする加圧ガス圧力設定ラインが複数列並列に設けら
れていることを特徴とするものである。A pressurized gas supply apparatus for hollow injection molding according to the present invention is a method for injecting a molten resin into a mold and then introducing a pressurized gas into a molded product in the mold. A pressurized gas supply device used in hollow injection molding for holding pressure, in which a plurality of pressurized gas pressure setting lines that decompress high-pressure gas into pressurized gas of a required pressure are provided in parallel. It is characterized by.
【０００７】[0007]
【作用】この発明による中空射出成形における加圧ガス
供給装置は、高圧ガスを減圧して所要の圧力の加圧ガス
とする加圧ガス圧力設定ラインが複数列並列に設けられ
ているものであるから、各圧力設定ラインの加圧ガス圧
力および保圧時間を成形品ごとに任意に設定することが
できる。The pressurized gas supply device for hollow injection molding according to the present invention is provided with a plurality of columns of pressurized gas pressure setting lines for depressurizing the high pressure gas to generate the pressurized gas at a required pressure. Therefore, the pressurized gas pressure and the pressure holding time of each pressure setting line can be arbitrarily set for each molded product.
【０００８】[0008]
【実施例】この発明の実施例を、以下図面を参照して説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は、中空射出成形における加圧ガス供
給装置のフロー図であり、加圧ガス供給装置は、窒素ガ
ス発生機(1) と、窒素ガスを所定の高圧まで加圧する加
圧部(2) と、金型中の成形品の内部に加圧ガスを供給す
る加圧ガス供給部(3) とよりなる。FIG. 1 is a flow chart of a pressurized gas supply device in hollow injection molding. The pressurized gas supply device comprises a nitrogen gas generator (1) and a pressurizing section for pressurizing the nitrogen gas to a predetermined high pressure. (2) and a pressurized gas supply unit (3) for supplying pressurized gas to the inside of the molded product in the mold.
【００１０】加圧部(2) は、１段目および２段目の窒素
ガス増圧用プランジャーポンプ(4)(5)と、各ポンプ(4)
(5)に設けられて高圧の窒素ガスを蓄える第１および第
２タンク(6)(7)とを備えている。各プランジャーポンプ
(4)(5)の流量は、２Ｎｍ3 ／Ｈとされ、第１タンク(6)
の容量は１リットル、第２タンク(7) の容量は２リット
ルとされている。The pressurizing unit (2) is provided with the first and second stage plunger pumps (4) (5) for increasing the pressure of nitrogen gas and the respective pumps (4).
The first and second tanks (6) and (7) provided in (5) for storing high-pressure nitrogen gas are provided. Each plunger pump
The flow rate of (4) and (5) is set to 2 Nm 3 / H, and the first tank (6)
Has a capacity of 1 liter and the second tank (7) has a capacity of 2 liters.
【００１１】加圧ガス供給部(3) には、高圧の窒素ガス
を金型中の成形品の内部に導入される加圧ガスに要求さ
れる圧力まで減圧する加圧ガス圧力設定ライン(11)(12)
(13)が、３列並列に設けられている。加圧ガス圧力設定
ライン(11)(12)(13)の一端は、２段目の窒素ガス増圧用
プランジャーポンプ(5) に接続され、他端には、射出成
形機のインジェクションノズルに連通する充圧ライン(2
3)と、加圧ガスを減圧する減圧ライン(25)と、加圧ガス
を排出する排出ライン(28)とが接続されている。加圧ガ
ス供給部(3) は、射出成形機が複数ある場合には、複数
設けられる。The pressurized gas supply unit (3) has a pressurized gas pressure setting line (11) for reducing the pressure of the high-pressure nitrogen gas to the pressure required for the pressurized gas introduced into the molded product in the mold. ) (12)
(13) are provided in three columns in parallel. One end of the pressurized gas pressure setting line (11) (12) (13) is connected to the second stage nitrogen gas pressure increasing plunger pump (5), and the other end communicates with the injection nozzle of the injection molding machine. Charge line (2
3), the decompression line (25) for decompressing the pressurized gas, and the discharge line (28) for discharging the pressurized gas are connected. When there are a plurality of injection molding machines, a plurality of pressurized gas supply units (3) are provided.
【００１２】各圧力設定ライン(11)(12)(13)は、それぞ
れ、減圧弁(14)(15)(16)、デジタル圧力計(17)(18)(19)
およびエア作動弁(20)(21)(22)をこの順に備えている。
充圧ライン(23)は、デジタル圧力計(24)を備えている。
減圧ライン(25)は、エア作動弁(26)および流量調節弁(2
7)を備えている。排出ライン(28)は、エア作動弁(29)を
備えている。The pressure setting lines (11), (12) and (13) respectively include pressure reducing valves (14) (15) (16) and digital pressure gauges (17) (18) (19).
And air-operated valves (20) (21) (22) in this order.
The charging line (23) is equipped with a digital pressure gauge (24).
The decompression line (25) includes an air operated valve (26) and a flow control valve (2
7) is equipped. The discharge line (28) is equipped with an air operated valve (29).
【００１３】窒素ガス発生機により発生された８〜９Ｋ
（ｋｇ／ｃｍ2 ）の窒素ガスは、２段のポンプ(4)(5)に
よって、数百Ｋまで増圧されて、加圧ガス供給部(3) に
送られる。加圧ガス供給部(3) の各圧力設定ライン(11)
(12)(13)の圧力値は、例えば、第１列目の圧力設定ライ
ン(11)が高、第２列目の圧力設定ライン(12)が中、第３
列目の圧力設定ライン(13)が低とされ、エア作動弁(20)
(21)(22)を開閉させることにより、この順に順次充圧ラ
イン(23)と接続されていく。この場合の金型中の成形品
内の加圧ガスの圧力の時間変化（圧力パターン）を図２
に示す。金型中の成形品内の加圧ガスの圧力は、第１列
目の圧力設定ライン(11)の圧力値に達し、この圧力が一
定時間（ｔ1 からｔ2 までの数秒間）保持される。ここ
で、第２列目の圧力設定ライン(12)に切り換えられる
と、成形品内の加圧ガスの圧力は成形品の膨張に伴って
第２列目の圧力設定ライン(12)の圧力まで減少し、その
後第２列目の圧力設定ライン(12)の圧力が一定時間（ｔ
3 からｔ4 までの数秒間）保持される。ここで、第３列
目の圧力設定ライン(13)に切り換えられると、成形品内
の加圧ガスの圧力は第３列目の圧力設定ライン(13)の圧
力まで減少し、その後第３列目の圧力設定ライン(13)の
圧力が一定時間（ｔ5 からｔ6 までの数秒間）保持され
る。このような圧力パターンは、成形品の形状に応じ
て、種々試験されて、加圧ガスの圧力および保圧時間の
最適条件が見出される。8-9K generated by a nitrogen gas generator
The nitrogen gas of (kg / cm 2 ) is increased in pressure to several hundred K by the two-stage pumps (4) and (5) and sent to the pressurized gas supply unit (3). Each pressure setting line (11) of the pressurized gas supply unit (3)
The pressure values of (12) and (13) are, for example, high in the pressure setting line (11) in the first row, medium in the pressure setting line (12) in the second row, and third in the third row.
Pressure setting line (13) in row 1 is low, air actuated valve (20)
By opening and closing (21) and (22), the charging lines (23) are sequentially connected in this order. FIG. 2 shows the time change (pressure pattern) of the pressure of the pressurized gas in the molded product in the mold in this case.
Shown in The pressure of the pressurized gas in the molded product in the mold reaches the pressure value of the pressure setting line (11) in the first row, and this pressure is maintained for a certain time (several seconds from t 1 to t 2 ). It Here, when the pressure is changed to the pressure setting line (12) in the second row, the pressure of the pressurized gas in the molded product reaches the pressure in the pressure setting line (12) in the second row as the molded product expands. The pressure on the pressure setting line (12) in the second row decreases for a certain time (t
Hold for a few seconds from 3 to t 4 . Here, when the pressure setting line (13) in the third row is switched to, the pressure of the pressurized gas in the molded article decreases to the pressure in the pressure setting line (13) in the third row, and then the third row. The pressure in the eye pressure setting line (13) is maintained for a fixed time (several seconds from t 5 to t 6 ). Such a pressure pattern is variously tested according to the shape of the molded product to find the optimum conditions of the pressure of the pressurized gas and the pressure holding time.
【００１４】なお、上記実施例では、加圧ガス圧力設定
ラインが３列設けられているが、加圧ガス圧力設定ライ
ンは、２列以上であれば何列でもよい。圧力パターンを
変更するための構成は、上記実施例以外にもあるが、上
記のように圧力設定ライン(11)(12)(13)を複数列並列に
設ける場合では、加圧部(2) の仕様を変更する必要がな
く、簡単な構成で圧力パターンを変更することができる
という利点を有している。Although the pressurized gas pressure setting line is provided in three rows in the above embodiment, the pressurized gas pressure setting line may be in any number of rows as long as it is two or more rows. The configuration for changing the pressure pattern is not limited to the above embodiment, but in the case where the pressure setting lines (11), (12) and (13) are provided in a plurality of rows in parallel as described above, the pressurizing unit (2) is used. There is an advantage that the pressure pattern can be changed with a simple configuration without changing the specification of.
【００１５】[0015]
【発明の効果】この発明の中空射出成形における加圧ガ
ス供給装置によると、各圧力設定ラインの加圧ガス圧力
および保圧時間を成形品ごとに任意に設定することがで
きるので、これにより、成形品の形状に応じた加圧ガス
の圧力パターンの最適条件を見出だして、成形品の不良
を少なくすることができる。According to the pressurized gas supply apparatus for hollow injection molding of the present invention, the pressurized gas pressure and the pressure holding time of each pressure setting line can be arbitrarily set for each molded product. Optimum conditions of the pressure pattern of the pressurized gas according to the shape of the molded product can be found to reduce defects in the molded product.
【図１】この発明による中空射出成形における加圧ガス
供給装置を概略的に示すフロー図である。FIG. 1 is a flow chart schematically showing a pressurized gas supply device in hollow injection molding according to the present invention.
【図２】この加圧ガス供給装置により得られる圧力パタ
ーンの一例を示すグラフである。FIG. 2 is a graph showing an example of a pressure pattern obtained by this pressurized gas supply device.
【図３】従来の中空射出成形装置の１例を示す断面図で
ある。FIG. 3 is a cross-sectional view showing an example of a conventional hollow injection molding device.
(3) 加圧ガス供給部 (11)(12)(13) 圧力設定ライン (3) Pressurized gas supply section (11) (12) (13) Pressure setting line
Claims (1)
中の成形品の内部に加圧ガスを導入して保圧を行う中空
射出成形に用いられる加圧ガス供給装置であって、高圧
ガスを減圧して所要の圧力の加圧ガスとする加圧ガス圧
力設定ラインが複数列並列に設けられていることを特徴
とする中空射出成形における加圧ガス供給装置。1. A pressurized gas supply device for use in hollow injection molding, in which a molten resin is injected into a mold, and then pressurized gas is introduced into the molded product in the mold to hold the pressure. A pressurized gas supply device in hollow injection molding, wherein a plurality of rows of pressurized gas pressure setting lines that depressurize the high-pressure gas into pressurized gas of a required pressure are provided in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06040295A JP3586752B2 (en) | 1995-03-20 | 1995-03-20 | Pressurized gas supply device in hollow injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06040295A JP3586752B2 (en) | 1995-03-20 | 1995-03-20 | Pressurized gas supply device in hollow injection molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08258074A true JPH08258074A (en) | 1996-10-08 |
| JP3586752B2 JP3586752B2 (en) | 2004-11-10 |
Family
ID=13141148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06040295A Expired - Fee Related JP3586752B2 (en) | 1995-03-20 | 1995-03-20 | Pressurized gas supply device in hollow injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3586752B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100400457B1 (en) * | 2001-05-10 | 2003-10-01 | 엘지전자 주식회사 | Gas supplier for making foamed plastic |
| WO2004005003A1 (en) * | 2002-07-04 | 2004-01-15 | Mitsubishi Engineering-Plastics Corporation | Pressurized gas introducing device, and injection molding method for moldings having hollow portion |
| KR100465686B1 (en) * | 2001-12-19 | 2005-01-13 | 엘지전자 주식회사 | Plastic maker including gas |
| KR100465687B1 (en) * | 2001-12-21 | 2005-01-13 | 엘지전자 주식회사 | Gas supplier for plastic maker including gas |
-
1995
- 1995-03-20 JP JP06040295A patent/JP3586752B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100400457B1 (en) * | 2001-05-10 | 2003-10-01 | 엘지전자 주식회사 | Gas supplier for making foamed plastic |
| KR100465686B1 (en) * | 2001-12-19 | 2005-01-13 | 엘지전자 주식회사 | Plastic maker including gas |
| KR100465687B1 (en) * | 2001-12-21 | 2005-01-13 | 엘지전자 주식회사 | Gas supplier for plastic maker including gas |
| WO2004005003A1 (en) * | 2002-07-04 | 2004-01-15 | Mitsubishi Engineering-Plastics Corporation | Pressurized gas introducing device, and injection molding method for moldings having hollow portion |
| US7521016B2 (en) | 2002-07-04 | 2009-04-21 | Mitsubishi Engineering-Plastics Corporation | Pressurized gas introducing device, and injection molding method for moldings having hollow portion |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3586752B2 (en) | 2004-11-10 |
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