JPH0673869B2 - Molding equipment for hollow moldings made of synthetic resin - Google Patents
Molding equipment for hollow moldings made of synthetic resinInfo
- Publication number
- JPH0673869B2 JPH0673869B2 JP3274257A JP27425791A JPH0673869B2 JP H0673869 B2 JPH0673869 B2 JP H0673869B2 JP 3274257 A JP3274257 A JP 3274257A JP 27425791 A JP27425791 A JP 27425791A JP H0673869 B2 JPH0673869 B2 JP H0673869B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- molding
- cavity
- outflow passage
- molten synthetic
- 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
- 238000000465 moulding Methods 0.000 title claims description 42
- 229920003002 synthetic resin Polymers 0.000 title claims description 32
- 239000000057 synthetic resin Substances 0.000 title claims description 32
- 230000007246 mechanism Effects 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 22
- 230000037431 insertion Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000463 material Substances 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
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は合成樹脂製中空成形体用
成形装置、特に、成形用キャビティ、その成形用キャビ
ティに連通するゲートおよび成形用キャビティに流出路
を介して連通するオーバフロー室を有する成形型と、ゲ
ートを通じて成形用キャビティに射出された溶融合成樹
脂に空洞部を形成すべく、その溶融合成樹脂内にガスを
吹込むガス吹込み機構とを備えた成形装置の改良に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for hollow moldings made of synthetic resin, and more particularly to a molding cavity, a gate communicating with the molding cavity, and an overflow chamber communicating with the molding cavity via an outflow passage. The present invention relates to an improvement of a molding apparatus provided with a molding die and a gas blowing mechanism that blows gas into the molten synthetic resin to form a cavity in the molten synthetic resin injected into a molding cavity through a gate.
【０００２】ここで中空成形体には、全体に亘って空洞
部が存するシェル状成形体の外に、一部に空洞部を有す
る成形体も包含される。[0002] Here, the hollow molded article includes a molded article having a hollow portion in addition to a shell-shaped molded article having a hollow portion throughout.
【０００３】[0003]
【従来の技術】従来、この種成形装置としては、オーバ
フロー室への流出路を常時開放状態にしたものが知られ
ている（例えば、特開平２−２１５５１６号公報参
照）。2. Description of the Related Art Heretofore, as this type of molding apparatus, there has been known a molding apparatus in which an outflow passage to an overflow chamber is always open (for example, see Japanese Patent Laid-Open No. 2-215516).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら従来装置
によると、キャビティに溶融合成樹脂を射出した際に、
その樹脂が流出路を通じてオーバフロー室へ流出するこ
とがあり、このような事態が発生すると、溶融合成樹脂
に射出圧が十分に作用しないため、中空成形体の表面性
が悪化し、またキャビティにおける樹脂量不足から中空
成形体にガスの吹抜けによる孔があいたり、肉厚の不均
一化を招く、といった問題を生じる。However, according to the conventional apparatus, when the molten synthetic resin is injected into the cavity,
The resin may flow out into the overflow chamber through the outflow passage, and when such a situation occurs, the injection pressure does not sufficiently act on the molten synthetic resin, which deteriorates the surface property of the hollow molded body, and also the resin in the cavity. Due to the lack of the amount, there arises a problem that holes are formed in the hollow molded article due to gas blow-out and the wall thickness becomes uneven.
【０００５】本発明は前記に鑑み、キャビティへの溶融
合成樹脂の射出時において、その樹脂のオーバフロー室
への流出を阻止し、これにより高品質な中空成形体を得
ることができるようにした前記成形装置を提供すること
を目的とする。In view of the above, the present invention prevents the outflow of the molten synthetic resin into the overflow chamber when the molten synthetic resin is injected into the cavity, thereby making it possible to obtain a high-quality hollow molded article. An object is to provide a molding device.
【０００６】[0006]
【課題を解決するための手段】本発明は、成形用キャビ
ティ、その成形用キャビティに連通するゲートおよび前
記成形用キャビティに流出路を介して連通するオーバフ
ロー室を有する成形型と、前記ゲートを通じて前記成形
用キャビティに射出された溶融合成樹脂に空洞部を形成
すべく、その溶融合成樹脂内にガスを吹込むガス吹込み
機構とを備えた成形装置において、前記成形用キャビテ
ィに前記溶融合成樹脂が充填されるまでは前記流出路を
閉鎖し、また前記ガス吹込み機構の作動中は前記流出路
を開放する流出路開閉機構を備えていることを特徴とす
る。According to the present invention, there is provided a molding die having a molding cavity, a gate communicating with the molding cavity, and an overflow chamber communicating with the molding cavity through an outflow passage, and the molding die through the gate. In a molding apparatus equipped with a gas blowing mechanism for blowing gas into the molten synthetic resin to form a cavity in the molten synthetic resin injected into the molding cavity, the molten synthetic resin is injected into the molding cavity. An outlet passage opening / closing mechanism is provided which closes the outlet passage until it is filled and opens the outlet passage during operation of the gas blowing mechanism.
【０００７】[0007]
【実施例】図１において、成形型１は固定型２と可動型
３とよりなり、両型２，３によって、円筒状をなす成形
用キャビティ４、そのキャビティ４の一端に連通するゲ
ート５およびキャビティ４の他端に流出路６を介して連
通するオーバフロー室７が形成される。ゲート５は図示
しない射出ノズルに連通する。また流出路６の断面積は
キャビティ４の断面積よりも小さくなるように設定され
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a molding die 1 comprises a fixed die 2 and a movable die 3, and a molding cavity 4 having a cylindrical shape, a gate 5 communicating with one end of the cavity 4 and An overflow chamber 7 communicating with the other end of the cavity 4 via the outflow passage 6 is formed. The gate 5 communicates with an injection nozzle (not shown). The cross-sectional area of the outflow passage 6 is set to be smaller than the cross-sectional area of the cavity 4.
【０００８】可動型３に、ゲート５を通じて成形用キャ
ビティ４に射出された溶融合成樹脂に空洞部を形成すべ
く、その溶融合成樹脂内に高圧ガスを吹込むガス吹込み
機構８が設けられている。そのガス吹込み機構８は次の
ように構成される。The movable mold 3 is provided with a gas blowing mechanism 8 for blowing a high pressure gas into the molten synthetic resin to form a cavity in the molten synthetic resin injected into the molding cavity 4 through the gate 5. There is. The gas blowing mechanism 8 is configured as follows.
【０００９】可動型３のゲート５近傍にガス用吹込み孔
９が形成され、その吹込み孔９を開閉する第１油圧シリ
ンダ１０が可動型３に付設される。第１油圧シリンダ１
０のシリンダ本体１１は、吹込み孔９側より可動型３外
部に向って順次配列された小径孔ａ1 ，中径孔ａ2 およ
び大径孔ａ3 を有する。大径孔ａ3 にピストン１２が摺
動自在に嵌合され、そのピストン１２により大径孔ａ 2
内は中径孔ａ2 側の第１油圧室１３とそれと反対側の第
２油圧室１４とに区画される。また小径孔ａ1にピスト
ン１２と一体のピストンロッド１５が摺動自在に嵌合さ
れ、そのピストンロッド１５によって小径孔ａ1 内に、
吹込み孔９に連通するガス用流通室１６が形成される。
ピストンロッド１５先端に、それよりも小径のロッド状
弁体１７が一体に設けられ、その弁体１７は吹込み孔９
に挿脱される。中径孔ａ2 および大径孔ａ3 間の段部ｂ
は、ピストン１２のストッパとして機能し、ピストン１
２が段部ｂに衝合した状態では弁体１７が吹込み孔９に
挿入されてそれを閉鎖する。A gas blowing hole 9 is formed in the vicinity of the gate 5 of the movable die 3, and a first hydraulic cylinder 10 for opening and closing the blowing hole 9 is attached to the movable die 3. First hydraulic cylinder 1
The cylinder body 11 of 0 has a small diameter hole a 1 , a medium diameter hole a 2 and a large diameter hole a 3 which are sequentially arranged from the side of the blow hole 9 toward the outside of the movable mold 3 . The piston 12 is slidably fitted in the large- diameter hole a 3, and the large-diameter hole a 2 is fitted by the piston 12.
The inside is partitioned into a first hydraulic chamber 13 on the side of the medium diameter hole a 2 and a second hydraulic chamber 14 on the opposite side. The piston 12 integral with the piston rod 15 is slidably fitted in the small diameter hole a 1, the small-diameter hole a 1 by the piston rod 15,
A gas flow chamber 16 communicating with the blow hole 9 is formed.
A rod-shaped valve body 17 having a smaller diameter than that of the piston rod 15 is integrally provided at the tip of the piston rod 15.
Be inserted and removed. Step b between the medium diameter hole a 2 and the large diameter hole a 3
Acts as a stopper for the piston 12, and the piston 1
When 2 abuts against the stepped portion b, the valve body 17 is inserted into the blowing hole 9 and closes it.
【００１０】第１，第２油圧室１３，１４は油路１８，
１９を介して切換弁２０の第１，第２ポートにそれぞれ
接続され、その切換弁２０の圧力ポートは作動源として
の油圧源２１に、また戻りポートは油タンク２２にそれ
ぞれ接続される。流通室１６は遮断弁２３を持つガス路
２４を介して窒素ガス等の高圧ガス供給源２５に接続さ
れる。The first and second hydraulic chambers 13 and 14 have oil passages 18,
The switching valve 20 is connected to the first and second ports of the switching valve 20 via 19, and the pressure port of the switching valve 20 is connected to the hydraulic pressure source 21 as an operation source, and the return port thereof is connected to the oil tank 22. The flow chamber 16 is connected to a high pressure gas supply source 25 such as nitrogen gas via a gas passage 24 having a shutoff valve 23.
【００１１】さらに、可動型３に、流出路６を開閉する
流出路開閉機構２６が設けられている。その流出路開閉
機構２６は次のように構成される。Further, the movable die 3 is provided with an outflow passage opening / closing mechanism 26 for opening / closing the outflow passage 6. The outflow passage opening / closing mechanism 26 is configured as follows.
【００１２】可動型３に流出路６に交差するガイド孔２
７が形成され、そのガイド孔２７を介して流出路６を開
閉する第２油圧シリンダ２８が可動型３に付設される。
第２油圧シリンダ２８のシリンダ本体２９は、ガイド孔
２７側より可動型３外部に向って順次配列された小径孔
ｃ1 、中径孔ｃ2 および大径孔ｃ3 を有する。大径孔ｃ
3 にピストン３０が摺動自在に嵌合され、そのピストン
３０により大径孔ｃ 3 内は中径孔ｃ2 側の第１油圧室３
１とそれと反対側の第２油圧室３２とに区画される。ま
た小径孔ｃ1 およびガイド孔２７にピストン３０と一体
のロッド状弁体３３が摺動自在に嵌合され、その弁体３
３が流出路６と交差するようになっている。中径孔ｃ2
および大径孔ｃ3 間の段部ｄは、ピストン３０のストッ
パとして機能し、ピストン３０が段部ｄに衝合した状態
では弁体３３が流出路６を閉鎖する。A guide hole 2 that intersects the outflow passage 6 in the movable mold 3.
The movable die 3 is provided with a second hydraulic cylinder 28 which is formed with the guide hole 27 and which opens and closes the outflow passage 6 through the guide hole 27.
The cylinder body 29 of the second hydraulic cylinder 28 has a small diameter hole c 1 , a medium diameter hole c 2 and a large diameter hole c 3 which are sequentially arranged from the guide hole 27 side toward the outside of the movable mold 3 . Large diameter hole c
A piston 30 is slidably fitted into the third hydraulic pressure chamber 3, and the piston 30 causes the inside of the large-diameter hole c 3 to have the first hydraulic chamber 3 on the side of the medium-diameter hole c 2.
1 and therewith is partitioned into a second hydraulic chamber 32 on the opposite side. A rod-shaped valve element 33 integral with the piston 30 is slidably fitted in the small-diameter hole c 1 and the guide hole 27.
3 intersects with the outflow passage 6. Medium diameter hole c 2
The step portion d between the large diameter hole c 3 and the large hole c 3 functions as a stopper of the piston 30, and the valve body 33 closes the outflow passage 6 when the piston 30 collides with the step portion d.
【００１３】弁体３３は熱伝導性の低い材料、例えばス
テンレス材より構成され、これにより弁体３３に接触す
る溶融合成樹脂の固化を防止することができる。弁体３
３に加熱用ヒータを内蔵させてもよい。The valve element 33 is made of a material having a low thermal conductivity, for example, a stainless material, so that the molten synthetic resin that contacts the valve element 33 can be prevented from solidifying. Disc 3
A heater for heating may be built in 3.
【００１４】第１油圧室３１は、油路３４を介してガス
吹込み機構８の第１油圧室１３側の油路１８に接続され
る。また第２油圧室３２は、油路３５を介してガス吹込
み機構８の第２油圧室１４側の油路１９に接続される。The first hydraulic chamber 31 is connected to the oil passage 18 on the first hydraulic chamber 13 side of the gas blowing mechanism 8 via an oil passage 34. The second hydraulic chamber 32 is connected to the oil passage 19 on the side of the second hydraulic chamber 14 of the gas blowing mechanism 8 via the oil passage 35.
【００１５】次に、全体に亘って空洞部を有する中空成
形体の成形作業について説明する。 （ａ） 図１に示すように、成形型１を閉じた状態にお
いて、切換弁２０を第１切換位置Ｅに保持して第１，第
２油圧シリンダ１０，２８の第１油圧室１３，３１を油
タンク２２に、また第２油圧室１４，３２を油圧源２１
にそれぞれ接続し、両ピストン１２，３０を作動させて
第１油圧シリンダ１０の弁体１７の前進により吹込み孔
９を閉鎖し、また第２油圧シリンダ２８の弁体３３の前
進により流出路６を閉鎖する。 （ｂ） 遮断弁２３を開放し、高圧ガス供給源２５を作
動して高圧ガスを流通室１６に導入する。 （ｃ） 射出ノズルよりゲート５を通じてキャビティ４
に溶融合成樹脂Ｒを射出して充填する。この場合、キャ
ビティ４に溶融合成樹脂Ｒが充填されるまでは流出路６
が閉鎖されているので、溶融合成樹脂Ｒに射出圧が十分
に作用してその溶融合成樹脂Ｒのキャビティ４内面との
接触面側が平滑化される。その接触面側は、成形型１に
より冷却されて流動しにくくなり、結果的に中空成形体
のスキン層を形成する。 （ｄ） 図２に示すように、切換弁２０を第２切換位置
Ｆに切換えて第１，第２油圧シリンダ１０，２８の第１
油圧室１３，３１を油圧源２１に、また第２油圧室１
４，３２を油タンク２２にそれぞれ接続し、両ピストン
１２，３０を作動させて第１油圧シリンダ１０の弁体１
７の後退により吹込み孔９を開放し、また第２油圧シリ
ンダ２８の弁体３３の後退により流出路６を開放する。Next, a molding operation of a hollow molded body having a hollow portion throughout will be described. (A) As shown in FIG. 1, with the mold 1 closed, the switching valve 20 is held at the first switching position E and the first hydraulic chambers 13, 31 of the first and second hydraulic cylinders 10, 28 are held. To the oil tank 22 and the second hydraulic chambers 14 and 32 to the hydraulic source 21.
And the pistons 12 and 30 are operated to move the valve body 17 of the first hydraulic cylinder 10 forward to close the blow hole 9, and the valve body 33 of the second hydraulic cylinder 28 moves forward to discharge the outflow passage 6. To close. (B) The shutoff valve 23 is opened and the high pressure gas supply source 25 is operated to introduce high pressure gas into the flow chamber 16. (C) Cavity 4 through the gate 5 from the injection nozzle
Then, the molten synthetic resin R is injected and filled. In this case, the outflow passage 6 is not filled until the cavity 4 is filled with the molten synthetic resin R.
Is closed, the injection pressure sufficiently acts on the molten synthetic resin R, and the contact surface side of the molten synthetic resin R with the inner surface of the cavity 4 is smoothed. The contact surface side is cooled by the molding die 1 and becomes hard to flow, and consequently forms the skin layer of the hollow molded body. (D) As shown in FIG. 2, the switching valve 20 is switched to the second switching position F so that the first and second hydraulic cylinders 10 and 28 move to the first position.
The hydraulic chambers 13 and 31 are used as the hydraulic source 21, and the second hydraulic chamber 1
4, 32 are connected to the oil tank 22, respectively, and both pistons 12, 30 are operated to operate the valve body 1 of the first hydraulic cylinder 10.
By retreating 7, the blow hole 9 is opened, and by retreating the valve element 33 of the second hydraulic cylinder 28, the outflow passage 6 is opened.
【００１６】同時に溶融合成樹脂Ｒ内に吹込み孔９を通
じて高圧ガスが吹込まれ、これにより溶融合成樹脂Ｒ内
に空洞部ｖが形成されると共に過剰の溶融合成樹脂が流
出路６を通じオーバフロー室７に流出して中空成形体Ｍ
が成形される。At the same time, a high-pressure gas is blown into the molten synthetic resin R through a blowing hole 9, whereby a cavity v is formed in the molten synthetic resin R, and excess molten synthetic resin flows through the outflow passage 6 into the overflow chamber 7 Hollow molded body M
Is molded.
【００１７】溶融合成樹脂Ｒにおいて、オーバフロー室
７に流出する過剰分は、キャビティ４内面との接触面側
が成形型１により冷却されて流動しにくくなっているこ
とから、内側に存する樹脂であり、したがって前記流出
によって中空成形体Ｍの表面が荒されることはない。ま
た中空成形体Ｍの空洞部ｖ内には高いガス圧が均等に作
用しているので、その肉厚の均一化が図られてひけの発
生が回避される。In the molten synthetic resin R, the excess flowing out into the overflow chamber 7 is the resin existing inside because the contact surface side with the inner surface of the cavity 4 is cooled by the molding die 1 and becomes hard to flow. Therefore, the surface of the hollow molded body M is not roughened by the outflow. Further, since the high gas pressure acts evenly in the hollow portion v of the hollow molded body M, the wall thickness is made uniform and the occurrence of sink marks is avoided.
【００１８】このようにして、表面性が良好で、肉厚の
均一な中空成形体Ｍを得ることができる。In this way, it is possible to obtain a hollow molded article M having a good surface property and a uniform wall thickness.
【００１９】またガス吹込み機構８と流出路開閉機構２
６とを共通１個の油圧源２１により作動させるようにす
ると、両機構８，２６の作動タイミングをとり易くし、
また装置のコンパクト化を図ることができる。ただし、
両機構８，２６の作動を別別の作動源により行ってもよ
い。The gas injection mechanism 8 and the outflow passage opening / closing mechanism 2
When 6 and 6 are operated by a single hydraulic power source 21, it is easy to set the operation timing of both mechanisms 8 and 26,
Further, the device can be made compact. However,
The operation of both mechanisms 8 and 26 may be performed by another operation source.
【００２０】図３，図４は、一部に空洞部を有する合成
樹脂製中空成形体としての自動車用リヤバンパ３６を示
す。リヤバンパ３６はその上縁部に、それに沿うワイヤ
ハーネス用挿通孔３７を有し、その挿通孔３７の長さ方
向中間部にワイヤハーネス挿入口３８が設けられ、挿通
孔３７の両端部は左、右のサイドマーカランプ取付孔３
９，４０に連通する。3 and 4 show a rear bumper 36 for an automobile as a synthetic resin hollow molded body having a hollow portion in a part thereof. The rear bumper 36 has a wire harness insertion hole 37 along the upper edge portion thereof, and a wire harness insertion opening 38 is provided in the longitudinal middle portion of the insertion hole 37, and both end portions of the insertion hole 37 are left, Right side marker lamp mounting hole 3
It communicates with 9,40.
【００２１】本発明は、このようなリヤバンパ３６の成
形にも適用され、このリヤバンパ３６はワイヤハーネス
をコンパクトに収納し得る、といった利点を有する。The present invention is also applied to the molding of such a rear bumper 36, and the rear bumper 36 has an advantage that the wire harness can be compactly stored.
【００２２】[0022]
【発明の効果】本発明によれば、前記のように比較的簡
単な手段を採用することによって、良好な表面性と均一
な肉厚を備えた高品質な中空成形体を成形し得る成形装
置を提供することができる。According to the present invention, by adopting the relatively simple means as described above, a molding apparatus capable of molding a high quality hollow molded article having good surface properties and a uniform wall thickness. Can be provided.
【図１】キャビティに溶融合成樹脂を充填した状態を示
す成形装置の縦断面図である。FIG. 1 is a vertical sectional view of a molding apparatus showing a state in which a molten synthetic resin is filled in a cavity.
【図２】キャビティに充填された溶融合成樹脂にガスを
吹込んだ状態を示す成形装置の縦断面図である。FIG. 2 is a vertical cross-sectional view of a molding apparatus showing a state where gas is blown into a molten synthetic resin filled in a cavity.
【図３】自動車用リヤバンパの斜視図である。FIG. 3 is a perspective view of a rear bumper for an automobile.
【図４】図３の４−４線断面図である。FIG. 4 is a sectional view taken along line 4-4 of FIG.
１ 成形型 ４ キャビティ ５ ゲート ６ 流出路 ７ オーバフロー室 ８ ガス吹込み機構 ２１ 油圧源（作動源） ２６ 流出路開閉機構 Ｒ 溶融合成樹脂 ｖ 空洞部 DESCRIPTION OF SYMBOLS 1 Mold 4 Cavity 5 Gate 6 Outflow path 7 Overflow chamber 8 Gas injection mechanism 21 Hydraulic pressure source (operating source) 26 Outflow path opening / closing mechanism R Molten synthetic resin v Cavity part
Claims (2)
ャビティ（４）に連通するゲート（５）および前記成形
用キャビティ（４）に流出路（６）を介して連通するオ
ーバフロー室（７）を有する成形型（１）と、前記ゲー
ト（５）を通じて前記成形用キャビティ（４）に射出さ
れた溶融合成樹脂（Ｒ）に空洞部（ｖ）を形成すべく、
その溶融合成樹脂（Ｒ）内にガスを吹込むガス吹込み機
構（８）とを備えた成形装置において、前記成形用キャ
ビティ（４）に前記溶融合成樹脂（Ｒ）が充填されるま
では前記流出路（６）を閉鎖し、また前記ガス吹込み機
構（８）の作動中は前記流出路（６）を開放する流出路
開閉機構（２６）を備えていることを特徴とする合成樹
脂製中空成形体用成形装置。1. A molding cavity (4), a gate (5) communicating with the molding cavity (4), and an overflow chamber (7) communicating with the molding cavity (4) through an outflow passage (6). To form a cavity (v) in the molten synthetic resin (R) injected into the molding cavity (4) through the gate (5) and a molding die (1) having
In a molding apparatus provided with a gas blowing mechanism (8) for blowing gas into the molten synthetic resin (R), the molding cavity (4) is filled with the molten synthetic resin (R) until the molding cavity is filled with the molten synthetic resin (R). A synthetic resin characterized by comprising an outflow passage opening / closing mechanism (26) for closing the outflow passage (6) and opening the outflow passage (6) during operation of the gas blowing mechanism (8). Molding device for hollow molded bodies.
開閉機構（２６）とを共通１個の作動源（２１）により
作動させるようにした、請求項１記載の合成樹脂製中空
成形体用成形装置。2. The hollow molding made of synthetic resin according to claim 1, wherein the gas injection mechanism (8) and the outflow passage opening / closing mechanism (26) are operated by a common one operation source (21). Body forming equipment.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3274257A JPH0673869B2 (en) | 1991-10-22 | 1991-10-22 | Molding equipment for hollow moldings made of synthetic resin |
| GB9222153A GB2260932B (en) | 1991-10-22 | 1992-10-21 | Molding apparatus for producing synthetic resin molded product |
| DE4235673A DE4235673C2 (en) | 1991-10-22 | 1992-10-22 | Method of manufacturing an injection molded hollow resin part and apparatus for carrying out the method |
| US08/234,606 US5612067A (en) | 1991-10-22 | 1994-04-28 | Molding apparatus for producing synthetic resin molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3274257A JPH0673869B2 (en) | 1991-10-22 | 1991-10-22 | Molding equipment for hollow moldings made of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05111926A JPH05111926A (en) | 1993-05-07 |
| JPH0673869B2 true JPH0673869B2 (en) | 1994-09-21 |
Family
ID=17539173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3274257A Expired - Fee Related JPH0673869B2 (en) | 1991-10-22 | 1991-10-22 | Molding equipment for hollow moldings made of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0673869B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6042356A (en) * | 1998-04-14 | 2000-03-28 | Larry J. Winget | Mold for use in a gas-assisted injection molding system and ejector pin subsystem including a blocking pin assembly for use therein |
| KR20010113253A (en) * | 2000-06-17 | 2001-12-28 | 김성동 | Forming mold construction |
| JP4558164B2 (en) * | 2000-09-21 | 2010-10-06 | 株式会社プライムポリマー | Molding method for hollow molded products |
| CN104552768B (en) * | 2015-01-31 | 2017-04-19 | 北京中拓机械集团有限责任公司 | Method for producing hollow products by fluid-assisted injection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5074660A (en) * | 1973-11-02 | 1975-06-19 | ||
| JPH02295714A (en) * | 1989-04-21 | 1990-12-06 | Kloeckner Ferromatik Desma Gmbh | Extrusion molding of synthetic resin filled with fluid and its apparatus |
| JPH03121820A (en) * | 1989-10-05 | 1991-05-23 | Asahi Chem Ind Co Ltd | Hollow molded material and its molding method |
-
1991
- 1991-10-22 JP JP3274257A patent/JPH0673869B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5074660A (en) * | 1973-11-02 | 1975-06-19 | ||
| JPH02295714A (en) * | 1989-04-21 | 1990-12-06 | Kloeckner Ferromatik Desma Gmbh | Extrusion molding of synthetic resin filled with fluid and its apparatus |
| JPH03121820A (en) * | 1989-10-05 | 1991-05-23 | Asahi Chem Ind Co Ltd | Hollow molded material and its molding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05111926A (en) | 1993-05-07 |
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| LAPS | Cancellation because of no payment of annual fees |