JPH1190954A - Gas-assisted molding gas injection needle - Google Patents
Gas-assisted molding gas injection needleInfo
- Publication number
- JPH1190954A JPH1190954A JP27222797A JP27222797A JPH1190954A JP H1190954 A JPH1190954 A JP H1190954A JP 27222797 A JP27222797 A JP 27222797A JP 27222797 A JP27222797 A JP 27222797A JP H1190954 A JPH1190954 A JP H1190954A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- screw
- gas passage
- groove
- gas injection
- 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
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
- B29C45/1734—Nozzles therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、合成樹脂のガス
アシスト成形の際に、ガス注入部として金型に設けられ
るガスアシスト成形用のガス注入ニードルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas injection needle for gas assist molding, which is provided in a mold as a gas injection part when performing gas assist molding of a synthetic resin.
【0002】[0002]
【従来の技術】ガスアシスト成形は、CRTディスプレ
イ装置のキャビネット等のように、ボスやリブ等を持つ
筐体を射出成形する際、樹脂充填の直後にガス注入ニー
ドルのガス注入口から樹脂中にガスを注入し、ボスやリ
ブの根元部分にガスを入り込ませてその根元部分を膨張
させ、これによりボスやリブ等の部分にヒケが発生する
のを防止する、というヒケ防止のために採用される成形
方法である。主として、保圧によるヒケ防止対策が有効
でない場合に採用される。2. Description of the Related Art In a gas-assist molding, when a casing having bosses, ribs, or the like, such as a cabinet of a CRT display device, is injection-molded, the resin is injected into the resin from a gas injection port of a gas injection needle immediately after the resin is filled. It is used to prevent sink marks by injecting gas and injecting gas into the roots of the bosses and ribs to expand the roots, thereby preventing sinks from occurring in the bosses and ribs. Molding method. It is mainly used when the measure for preventing sink mark by holding pressure is not effective.
【0003】このガスアシスト成形に用いる従来のガス
注入ニードル1を図10〜図15に示す。図10は従来
のガス注入ニードル1の正面図、図11は図10におけ
るD−D断面図、図12は図11におけるE−E断面
図、図13は図11において先端ねじ3を外して示した
図、図14はニードル本体2の平面図、図15は先端ね
じ3の断面図(図13におけるF−F断面図)である。
これらの図に示すように、ガス注入ニードル1は、先端
側の中空部2bの内面に雌ねじ2aを形成した中空筒状
のニードル本体2と、このニードル本体2の前記雌ねじ
2aにねじ込まれる頭部付きの先端ねじ3とからなって
いる。そして、この先端ねじ3はねじ軸部5の外面に軸
長方向に伸びるガス通路用切り欠き5aを形成するとと
もに、先端ねじ3の頭部6の下面側に前記ガス通路用切
り欠き5aにつながる半径方向のガス通路用溝6aを形
成している。FIGS. 10 to 15 show a conventional gas injection needle 1 used for the gas assist molding. 10 is a front view of the conventional gas injection needle 1, FIG. 11 is a cross-sectional view taken along the line DD in FIG. 10, FIG. 12 is a cross-sectional view taken along the line EE in FIG. 11, and FIG. FIG. 14 is a plan view of the needle main body 2, and FIG. 15 is a cross-sectional view of the tip screw 3 (a cross-sectional view taken along line FF in FIG. 13).
As shown in these figures, a gas injection needle 1 has a hollow cylindrical needle body 2 having a female screw 2a formed on the inner surface of a hollow portion 2b on the tip side, and a head screwed into the female screw 2a of the needle body 2. And a tip screw 3 with The tip screw 3 forms a gas passage cutout 5 a extending in the axial direction on the outer surface of the screw shaft portion 5, and connects to the gas passage cutout 5 a on the lower surface side of the head 6 of the tip screw 3. A radial gas passage groove 6a is formed.
【0004】上記のように、従来のガス注入ニードル1
はガス注入口として、先端ねじ3側にガス通路用溝6a
を形成していた。As described above, the conventional gas injection needle 1
Is a gas inlet groove 6a on the tip screw 3 side as a gas inlet.
Had formed.
【0005】[0005]
【発明が解決しようとする課題】上記従来のガス注入ニ
ードル1において、ニードル本体2の中空部2b内に送
られたガスは、先端ねじ3の外面に設けたガス通路用切
り欠き5aの部分に形成される隙間を通り、先端ねじ3
の頭部6の裏面に形成されたガス通路用溝6aを通っ
て、成形金型内の樹脂中に注入される。上記従来のガス
注入ニードル1においては、ガス通路用溝6aの存在が
先端ねじ3の強度を低下させており、先端ねじ3の締め
付けトルクによって、先端ねじ3が全体的に変形して使
用できなくなったり、ガス注入口であるガス通路用溝6
aの寸法が変化してしまうという問題があった。In the conventional gas injection needle 1 described above, the gas sent into the hollow portion 2b of the needle body 2 is supplied to the gas passage cutout 5a provided on the outer surface of the tip screw 3. After passing through the formed gap, the tip screw 3
Is injected into the resin in the molding die through the gas passage groove 6a formed on the back surface of the head 6 of FIG. In the conventional gas injection needle 1 described above, the presence of the gas passage groove 6a lowers the strength of the tip screw 3, and the tightening torque of the tip screw 3 deforms the tip screw 3 as a whole, making it unusable. Gas passage groove 6 which is a gas inlet
There is a problem that the dimension of a changes.
【0006】さらに、先端ねじ3の頭部6の下面にガス
通路用溝6aを形成する加工は、先端ねじ3は頭部の外
径(=ガス注入ニードル1の外径)が6〜9mm、厚み
が0.5〜2.0mm等と小さなものであり、また、先
端ねじ3の頭部の下面という加工がしにくい箇所である
ことから、先端ねじ3に深さ0.03〜0.05mm等
のガス通路用溝6aを形成する加工は技術的に容易でな
いという問題もある。また、ガス注入方向を特定の方向
に向けようとしても、このガス注入方向は先端ねじ3の
ねじ締め付け時の最終回転位置によって決まるため、ガ
ス注入方向を特定の方向に向けようとしても、ガス注入
方向を所望の方向にコントロールすることはできない。Further, in forming the gas passage groove 6a on the lower surface of the head 6 of the tip screw 3, the tip screw 3 has an outer diameter of the head (= the outer diameter of the gas injection needle 1) of 6 to 9 mm. Since the thickness is as small as 0.5 to 2.0 mm and the like, the lower surface of the head of the tip screw 3 is difficult to machine, the depth of the tip screw 3 is 0.03 to 0.05 mm. There is also a problem that processing for forming the gas passage groove 6a is not technically easy. Further, even if the gas injection direction is directed to a specific direction, the gas injection direction is determined by the final rotation position when the tip screw 3 is tightened. The direction cannot be controlled to the desired direction.
【0007】本発明は上記従来の欠点を解消するために
なされたもので、ガス注入口の寸法がねじの締め付けト
ルクによって影響を受けることがなく、また、ねじの締
め付け強さによって先端ねじが変形して使用できなくな
るようなこともなく、さらに、ガス注入口であるガス通
路用溝の加工が容易なガスアシスト成形用のガス注入ニ
ードルを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages, and the dimensions of the gas inlet are not affected by the tightening torque of the screw, and the tip screw is deformed by the tightening strength of the screw. Another object of the present invention is to provide a gas injection needle for gas assist molding in which a gas passage groove serving as a gas injection port can be easily processed without becoming unusable.
【0008】[0008]
【課題を解決するための手段】上記課題を解決する本発
明は、先端側の中空部内面に雌ねじを形成した中空筒状
のニードル本体と、このニードル本体の前記雌ねじ部に
ねじ込まれる頭部付きの先端ねじとを備えたガスアシス
ト成形用のガス注入ニードルにおいて、前記先端ねじの
ねじ軸部の外面に、軸長方向に伸びるガス通路用切り欠
きを形成するとともに、前記ニードル本体の先端面に、
前記先端ねじのガス通路用切り欠きで形成される隙間に
連通可能なガス通路用溝を形成したことを特徴とする。According to the present invention, there is provided a hollow cylindrical needle body having a female thread formed on the inner surface of a hollow portion on the distal end side, and a head screwed into the female thread portion of the needle body. In the gas injection needle for gas assist molding provided with a tip screw, a notch for a gas passage extending in an axial direction is formed on an outer surface of a screw shaft portion of the tip screw, and a tip face of the needle main body is formed on the tip face. ,
A gas passage groove capable of communicating with a gap formed by the gas passage cutout of the tip screw is formed.
【0009】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図1
〜図9に示した実施例を参照して説明する。図1は本発
明の一実施例のガス注入ニードル11の正面図、図2は
図1におけるA−A断面図、図3は図2におけるB−B
断面図、図4は図2において先端ねじ13を外して示し
た図、図5はニードル本体12の平面図、図6は先端ね
じ13の断面図(図4におけるC−C断面図)である。
これらの図に示すように、このガス注入ニードル11
は、中空部12bの先端側の内面に雌ねじ12aを形成
した中空筒状のニードル本体12と、このニードル本体
12の前記雌ねじ12aにねじ込まれる頭部付きの先端
ねじ13とからなっている。そして、この先端ねじ13
にはねじ軸部15の外面に軸長方向に伸びるガス通路用
切り欠き15aを形成している。図示例では、ガス通路
用切り欠き15aをねじ軸部15の1箇所に形成してい
る。一方、ニードル本体12の上端面には、前記先端ね
じ13のガス通路用切り欠き15aで形成される隙間に
連通可能な半径方向のガス通路用溝12cを形成してい
る。図示例ではガス通路用溝12cを十字形の四方向に
形成している。FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the embodiment shown in FIGS. FIG. 1 is a front view of a gas injection needle 11 according to one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG.
FIG. 4 is a cross-sectional view of FIG. 2 with the tip screw 13 removed, FIG. 5 is a plan view of the needle body 12, and FIG. 6 is a cross-sectional view of the tip screw 13 (a cross-sectional view taken along line CC in FIG. 4). .
As shown in these figures, this gas injection needle 11
The needle body 12 comprises a hollow cylindrical needle body 12 having a female screw 12a formed on the inner surface on the distal end side of the hollow portion 12b, and a head screw 13 with a head screwed into the female screw 12a of the needle body 12. And this tip screw 13
A gas passage cutout 15a extending in the axial direction is formed on the outer surface of the screw shaft portion 15. In the illustrated example, the gas passage cutout 15 a is formed at one position of the screw shaft portion 15. On the other hand, on the upper end surface of the needle main body 12, a radial gas passage groove 12c is formed which can communicate with a gap formed by the gas passage cutout 15a of the tip screw 13. In the illustrated example, the gas passage grooves 12c are formed in four cross-shaped directions.
【0010】上記のガス注入ニードル11において、ニ
ードル本体12の中空部12b内に送られたガスは、先
端ねじ13の外面に設けたガス通路用切り欠き15aの
部分に形成される隙間を通り、次いで、ニードル本体1
2の上端面に形成されたガス通路用溝12cすなわちガ
ス注入口を通って、成形金型内の樹脂中に注入される。
注入されたガスは、ボスやリブ(となる部分)の根元部
分に入り込んでその根元部分を膨張させ、ボスやリブ等
の部分にヒケが発生するのを防止する。In the gas injection needle 11 described above, the gas sent into the hollow portion 12 b of the needle body 12 passes through a gap formed in a gas passage cutout 15 a provided on the outer surface of the tip screw 13, Next, the needle body 1
The gas is injected into the resin in the molding die through the gas passage groove 12c formed on the upper end surface of the mold 2, that is, the gas injection port.
The injected gas enters the roots of the bosses and ribs (parts to be formed) and expands the roots, thereby preventing sinks from being generated in the bosses and ribs.
【0011】なお、ニードル本体12側のガス通路用溝
12cは四方にあるので、先端ねじ13の締め付け時の
最終回転位置がどの位置であっても、先端ねじ13のガ
ス通路用切り欠き15aで形成される隙間との連通を確
保することは可能である。Since the gas passage groove 12c on the needle body 12 is located on all sides, the gas passage notch 15a of the tip screw 13 can be used regardless of the final rotation position when the tip screw 13 is tightened. It is possible to ensure communication with the formed gap.
【0012】上記のガス注入ニードル11においては、
先端ねじ13にはガス通路用溝がないので、寸法の小さ
な先端ねじ13の頭部16の下面にガス通路用溝を形成
するという加工技術上の困難を回避できる。なお、ニー
ドル本体12の上端面にガス通路用溝12cを形成する
加工には、特に困難はない。また、先端ねじ13にガス
通路用切り欠き15aを形成する加工は、円形断面のね
じ軸部15の一部をフラットにするだけであるから、特
に困難はない。In the gas injection needle 11 described above,
Since the tip screw 13 does not have a gas passage groove, it is possible to avoid the difficulty in processing technology of forming a gas passage groove on the lower surface of the head 16 of the small-sized tip screw 13. There is no particular difficulty in forming the gas passage groove 12c on the upper end surface of the needle body 12. In addition, the process of forming the gas passage cutout 15a in the distal end screw 13 is not particularly difficult because it only makes a part of the screw shaft portion 15 having a circular cross section flat.
【0013】また、先端ねじ13にガス通路用溝がない
ので、ガス注入口であるガス通路用溝の寸法が変化して
しまうという問題は生じない。また、先端ねじ13の強
度低下はなく、先端ねじ13の締め付けトルクによっ
て、先端ねじ13が全体的に変形してしまうなどの損傷
は生じない。Further, since there is no gas passage groove in the tip screw 13, there is no problem that the dimension of the gas passage groove serving as the gas inlet changes. Further, there is no reduction in the strength of the tip screw 13 and no damage such as the tip screw 13 being entirely deformed by the tightening torque of the tip screw 13 occurs.
【0014】上述の実施例ではガス通路用切り欠き15
aを先端ねじ13のねじ軸部15の1箇所に形成した
が、図7に示すように、先端ねじ13のねじ軸部15の
180°対向する2箇所にガス通路用切り欠き15aを
形成してもよい。これにより、ガス通路用切り欠き15
aで形成される隙間とニードル本体12側にあるガス通
路用溝12cとの連通をさらに確実にできる。In the above embodiment, the gas passage cutout 15
a is formed at one position of the screw shaft portion 15 of the tip screw 13, but as shown in FIG. 7, gas passage cutouts 15 a are formed at two positions 180 ° opposite to each other with respect to the screw shaft portion 15 of the tip screw 13. You may. As a result, the gas passage notch 15
Communication between the gap formed by a and the gas passage groove 12c on the needle body 12 side can be further ensured.
【0015】図8にニードル本体12のガス通路用溝に
ついての他の実施例を示す。この実施例は、ガス通路用
溝12’cを180°の2方向にのみ形成したもので、
そして、2箇所のガス通路用溝12’cがガス通路用切
り欠き15aによる隙間に常に連通できるように、ガス
通路用溝12’cの幅を広く形成したものである。この
場合、ガス注入方向はニードル本体12側にあるガス通
路用溝12’cで決定されるから、ニードル本体12を
所望のガス通路用溝12’cの向きとなるように設置す
ることで、ガス注入方向を所望の二方向に設定すること
ができる。FIG. 8 shows another embodiment of the gas passage groove of the needle body 12. In this embodiment, the gas passage grooves 12′c are formed only in two directions of 180 °.
The width of the gas passage groove 12'c is formed so that the two gas passage grooves 12'c can always communicate with the gap formed by the gas passage notch 15a. In this case, since the gas injection direction is determined by the gas passage groove 12'c on the needle body 12, the needle body 12 is installed so as to be oriented in a desired gas passage groove 12'c. The gas injection direction can be set to two desired directions.
【0016】図9にニードル本体12のガス通路用溝に
ついてのさらに他の実施例を示す。この実施例は、ガス
通路用溝12”cを一方向にのみ形成したもので、そし
て、1箇所のガス通路用溝12”cがガス通路用切り欠
き15aによる隙間に常に連通できるように、ガス通路
用溝12’cの幅をさらに広く形成したものである。こ
の場合、ガス注入方向を所望の一方向に設定することが
できる。FIG. 9 shows still another embodiment of the gas passage groove of the needle body 12. In this embodiment, the gas passage groove 12 "c is formed only in one direction, and one gas passage groove 12" c can always communicate with the gap formed by the gas passage notch 15a. The width of the gas passage groove 12'c is further increased. In this case, the gas injection direction can be set to a desired one direction.
【0017】本発明において、ニードル本体の上端面に
形成するガス通路用溝は、上述の各実施例の場合に限ら
ず、要するに、ガス通路用溝が、先端ねじ13の回転位
置によらず常に、先端ねじ13側のガス通路用切り欠き
による隙間に連通できるような位置および幅であればよ
い。In the present invention, the gas passage groove formed on the upper end surface of the needle main body is not limited to the case of each of the above-described embodiments. In short, the gas passage groove is always formed regardless of the rotational position of the tip screw 13. Any position and width may be used so long as they can communicate with the gap formed by the gas passage cutout on the tip screw 13 side.
【0018】[0018]
【発明の効果】本発明によれば、ガス通路用溝を先端ね
じ側に設けず、ニードル本体側に形成しているので、ガ
ス通路用溝すなわちガス注入口の寸法が変化してしまう
という問題は生じない。また、先端ねじの強度低下はな
く、先端ねじの締め付けトルクによって、先端ねじが全
体的に変形してしまうという損傷は生じない。According to the present invention, since the gas passage groove is not provided on the tip screw side but formed on the needle body side, the size of the gas passage groove, that is, the size of the gas injection port is changed. Does not occur. Further, there is no reduction in the strength of the tip screw, and there is no damage that the tip screw is entirely deformed by the tightening torque of the tip screw.
【0019】ガス通路用溝が先端ねじ側にないので、小
さな先端ねじにガス通路用溝を形成するという加工技術
上の困難を回避できる。Since the gas passage groove is not provided on the tip screw side, it is possible to avoid the difficulty in forming the gas passage groove in the small tip screw in terms of processing technology.
【0020】ガス通路用溝がニードル本体側にあるの
で、ガス注入方向は、先端ねじの締め付け時の最終回転
位置とは無関係で、ニードル本体によって決定される。
したがって、ガス注入方向を所望の方向に向けるとい
う、ガス注入方向のコントロールが可能となる。Since the gas passage groove is located on the needle body side, the gas injection direction is determined by the needle body regardless of the final rotational position when the tip screw is tightened.
Therefore, it is possible to control the gas injection direction, that is, to direct the gas injection direction to a desired direction.
【図1】本発明の一実施例のガスアシスト成形用のガス
注入ニードルの先端部近傍の正面図である。FIG. 1 is a front view of the vicinity of a distal end portion of a gas injection needle for gas assist molding according to an embodiment of the present invention.
【図2】図1におけるA−A断面図である。FIG. 2 is a sectional view taken along line AA in FIG.
【図3】図2におけるB−B断面図である。FIG. 3 is a sectional view taken along line BB in FIG. 2;
【図4】図2において先端ねじを外して示した図であ
る。FIG. 4 is a view showing a state where a tip screw is removed in FIG. 2;
【図5】図4におけるニードル本体の平面図である。FIG. 5 is a plan view of the needle main body in FIG.
【図6】図4における先端ねじのC−C断面図である。FIG. 6 is a sectional view of the tip screw taken along the line CC in FIG. 4;
【図7】本発明におけるニードル本体についての他の実
施例を示すもので、図2のB−B断面図に相当(図3に
相当)する図である。7 shows another embodiment of the needle body according to the present invention, and corresponds to a sectional view taken along the line BB of FIG. 2 (corresponding to FIG. 3).
【図8】本発明におけるニードル本体についてのさらに
他の実施例を示すもので、図2のB−B断面図に相当
(図3に相当)する図である。FIG. 8 is a view showing still another embodiment of the needle body according to the present invention, and is a view corresponding to a sectional view taken along line BB of FIG. 2 (corresponding to FIG. 3).
【図9】本発明におけるニードル本体についてのさらに
他の実施例を示すもので、図2のB−B断面図に相当
(図3に相当)する図である。9 shows still another embodiment of the needle body according to the present invention, and is a view corresponding to the cross-sectional view taken along the line BB of FIG. 2 (corresponding to FIG. 3).
【図10】従来のガスアシスト成形用のガス注入ニード
ルの先端部近傍の正面図である。FIG. 10 is a front view showing the vicinity of the tip of a conventional gas injection needle for gas assist molding.
【図11】図10におけるD−D断面図である。11 is a sectional view taken along line DD in FIG.
【図12】図11におけるE−E断面図である。FIG. 12 is a sectional view taken along line EE in FIG. 11;
【図13】図11において先端ねじを外して示した図で
ある。FIG. 13 is a view showing a state where a tip screw is removed in FIG. 11;
【図14】図13におけるニードル本体の平面図であ
る。FIG. 14 is a plan view of the needle main body in FIG.
【図15】図13における先端ねじのF−F断面図であ
る。FIG. 15 is a sectional view of the tip screw taken along line FF in FIG. 13;
11 ガス注入ニードル 12 ニードル本体 12a 雌ねじ 12b 中空部 12c ガス通路用溝 13 先端ねじ 15 ねじ軸部 15a ガス通路用切り欠き 16 先端ねじの頭部 DESCRIPTION OF SYMBOLS 11 Gas injection needle 12 Needle main body 12a Female screw 12b Hollow part 12c Gas passage groove 13 Tip screw 15 Screw shaft part 15a Notch for gas passage 16 Head of tip screw
Claims (1)
中空筒状のニードル本体と、このニードル本体の前記雌
ねじ部にねじ込まれる頭部付きの先端ねじとを備えたガ
スアシスト成形用のガス注入ニードルにおいて、 前記先端ねじのねじ軸部の外面に、軸長方向に伸びるガ
ス通路用切り欠きを形成するとともに、前記ニードル本
体の先端面に、前記先端ねじのガス通路用切り欠きで形
成される隙間に連通可能なガス通路用溝を形成したこと
を特徴とするガスアシスト成形用のガス注入ニードル。1. A gas for gas assist molding, comprising: a hollow cylindrical needle body having a female screw formed on the inner surface of a hollow portion on the distal end side; and a head screw having a head screwed into the female screw portion of the needle body. In the injection needle, a gas passage notch extending in the axial direction is formed on an outer surface of a screw shaft portion of the tip screw, and a gas passage notch of the tip screw is formed on a tip surface of the needle body. A gas injection needle for gas assist molding, wherein a gas passage groove capable of communicating with a gap is formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27222797A JPH1190954A (en) | 1997-09-18 | 1997-09-18 | Gas-assisted molding gas injection needle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27222797A JPH1190954A (en) | 1997-09-18 | 1997-09-18 | Gas-assisted molding gas injection needle |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1190954A true JPH1190954A (en) | 1999-04-06 |
Family
ID=17510896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27222797A Pending JPH1190954A (en) | 1997-09-18 | 1997-09-18 | Gas-assisted molding gas injection needle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1190954A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1477291A1 (en) * | 2003-05-13 | 2004-11-17 | University of Warwick | Gas venting needle for an injection moulding machine |
US11504679B2 (en) | 2020-06-08 | 2022-11-22 | Mtec Co., Ltd. | Gas-liquid mixing device |
-
1997
- 1997-09-18 JP JP27222797A patent/JPH1190954A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1477291A1 (en) * | 2003-05-13 | 2004-11-17 | University of Warwick | Gas venting needle for an injection moulding machine |
US7179072B2 (en) | 2003-05-13 | 2007-02-20 | Gordon Frederick Smith | Gas venting needle |
US11504679B2 (en) | 2020-06-08 | 2022-11-22 | Mtec Co., Ltd. | Gas-liquid mixing device |
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