JPS608022A - Injection molding of embossed synthetic resin molded piece - Google Patents
Injection molding of embossed synthetic resin molded pieceInfo
- Publication number
- JPS608022A JPS608022A JP11525283A JP11525283A JPS608022A JP S608022 A JPS608022 A JP S608022A JP 11525283 A JP11525283 A JP 11525283A JP 11525283 A JP11525283 A JP 11525283A JP S608022 A JPS608022 A JP S608022A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molded product
- molten resin
- air
- compressed air
- 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
- B29C45/174—Applying a pressurised fluid to the outer surface of the injected material inside the mould cavity, e.g. for preventing shrinkage marks
-
- 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
- B29C45/1736—Nozzles therefor provided with small holes permitting the flow of gas therethrough, e.g. using a porous element of sintered material
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
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】
本発明は、シボやホーニング面等を有する合成樹脂の射
出成形法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for injection molding a synthetic resin having a grained or honed surface.
従来の樹脂成形品にあっては、第１図に示すように１そ
の表面にシボａを設けたシ、或いは図示しないがホーニ
ング面等を設けたりしたものがある。しかし、そのよう
なシボａ等を有する成形品は、例えば第２図及び第３図
に示すように、その背面の内側にボス部す及びリプｃｆ
ニ一体に形成したシ、ウェルドライン部ｄを設けた場合
、そのボス部すなどを設けた特殊な部分と、そうでない
部分とでは、成形時、溶融樹脂の流動方向・流動圧力ｅ
冷却時間等の条件が微妙に異なるので、シボａやホーニ
ング面等の光沢にムラが出てしまい、外観上の品質が低
下する問題がある。Among conventional resin molded products, as shown in FIG. 1, there are some that have grains a on their surfaces, or have honed surfaces (not shown). However, molded products having such grains a, etc., have bosses and lips cf on the inside of the back surface, as shown in FIGS. 2 and 3, for example.
When a weld line part d is provided, the special part with the boss part etc. and the other parts have different flow directions and flow pressures of the molten resin during molding.
Since the cooling time and other conditions are slightly different, there is a problem that the gloss of the grain a, honed surface, etc. becomes uneven, and the quality of the appearance deteriorates.
本発明は、上記事情に鑑み、ボス部やリム等を設けてい
ても、その部分とそうでない他の部分とが均一な光沢を
得ることができ、以て品質の向上を計ることができるシ
ボ部付合成樹脂成形品の射３頁
出成形法を提供せんとするものである。In view of the above-mentioned circumstances, the present invention has been developed to provide a texture that can provide uniform luster between bosses, rims, etc., and improve quality. The purpose of this invention is to provide a three-page injection molding method for synthetic resin molded products with parts.
以下、本発明の一実施例を第４図乃至第１１図について
説明する。An embodiment of the present invention will be described below with reference to FIGS. 4 to 11.
この実施例は、成形品１をなす溶融樹脂を射出機２によ
って金型３内に充填させ、その溶融樹脂を冷却硬化する
ことによって成形品１を成形している。In this embodiment, the molded article 1 is formed by filling a mold 3 with a molten resin forming the molded article 1 using an injection machine 2, and cooling and hardening the molten resin.
具体的に述べると、前記成形品１は、第６図。Specifically, the molded product 1 is shown in FIG.
第７図に示すように断面コ字形の環状をなしておシ、そ
の表面にシボ１＆を有している。また成形品１の背面に
は、対応する位置に夫々突設したボス部１１ａと該ボス
部１１ａの両がわ位置に設けたリプｌｌｂとからなる突
起１１を形成し、かつその表面の対応する位置にはウェ
ルドライン部１２を設けている。前記金型３は、第４図
及び第５図に示すように、成形品１の表面がわをなす雌
型部３１と、成形品１の背面がわをなすコア入子３３を
有する雄型部３２とによって構成されている。そして金
型３の雄型部３２には成形品１の突起１１付近及びウェ
ルドライン部１２と対応する位置に貫通孔５を有する多
孔部材６を夫々配設している。As shown in FIG. 7, it is annular with a U-shaped cross section, and has grains 1& on its surface. Further, on the back surface of the molded product 1, there are formed protrusions 11 consisting of boss portions 11a protruding from corresponding positions and lips llb provided on both sides of the boss portions 11a. A weld line portion 12 is provided at the position. As shown in FIGS. 4 and 5, the mold 3 is a male mold having a female part 31 forming a curve on the surface of the molded product 1, and a core insert 33 forming a curve on the back surface of the molded product 1. 32. In the male mold part 32 of the mold 3, porous members 6 having through holes 5 are disposed in the vicinity of the projections 11 of the molded product 1 and in positions corresponding to the weld line parts 12, respectively.
該多孔部材６は、金型雄型部３２のコア入子３３におい
て、成形品ｌのボス部１１ａとリプｌｌｂとの間に埋設
されると共に、成形品１のウェルドライン部１２をなす
位置に埋設され、溶融樹脂に対して耐熱性のある材料、
例えば金属やセラ町ツクス等がらなっている。前記貫通
孔５は詳細に図示していないが、成形品１に向っており
、かつ溶融樹脂が金型３内゛に充填されたときに入シ込
まない程度の大きさく約５〜３０μｍ）をなして、多孔
部材６中に複数形成されている。The porous member 6 is embedded in the core insert 33 of the male part 32 of the mold between the boss part 11a and the lip 1lb of the molded product 1, and is located at a position forming the weld line part 12 of the molded product 1. A material that is buried and heat resistant to molten resin,
For example, it is made of metals and Sera Town Tsukusu. Although the through hole 5 is not shown in detail, it faces the molded product 1 and has a size of approximately 5 to 30 μm to prevent the molten resin from entering when it is filled into the mold 3. A plurality of holes are formed in the porous member 6.
そして、貫通孔５に空気路７を介して空気制御手段８を
設け、該空気制御手段８により貫通孔５に圧縮空気を送
シ込むことができるよう罠なっている。即ち、前記空気
路７は゛、金型雄型部３２のコア入子３３に穿設しかつ
多孔部材６０貫通孔５に連絡した第１空気路７ａと、該
第１空気路７ａＫ連絡しかつ雄型部を外方に開口するよ
うに貫通形成した第２空気路７ｂとからなっている。前
記空気制御手段８は、第４図に明示するように、エアポ
ンプ８１５丁・
と、エアフィルタ８２と、方向切換弁８３と、圧力調整
弁８４と、該圧力調整弁８４及び前記空気路７を連結す
る連結部８５と、射出機２のタイミングに同調させて信
号を出力する射出機信号８６と、該射出機信・号８６か
らの出力によって方向切換弁８３を切換え制御するタイ
マー釘とを備えている。この空気制御手段８は、射出機
２が溶融樹脂を金型３内に充填したとき、前記タイマー
８７が、射出機信号８６の出力によって入力されると共
に、金型３内の溶融樹脂が冷却硬化しつつ状態にあると
きに方向切換弁８３を位置イから位置筒に切換えること
により、エアポンプ８１からの圧縮空気を空気路７を介
して多孔部材６０貫通孔５に送シ込めることができるよ
うになっている。そして、空気制御手段８によって圧縮
空気を貫通孔５に送り込むと、その圧縮空気が貫通孔５
を通過して金型雄型部３２のコア入子３３と成形品１を
なす溶融樹脂との間に空気層１０を形成し、該空気層１
０が突起１１付近及びウェルドライン部１２を表面がわ
抑圧することができるようになっている。An air control means 8 is provided in the through hole 5 via an air passage 7, and the air control means 8 serves as a trap so that compressed air can be sent into the through hole 5. That is, the air passage 7 is connected to a first air passage 7a formed in the core insert 33 of the male part 32 of the mold and communicating with the through hole 5 of the porous member 60, and a male It consists of a second air passage 7b formed through the mold part so as to open outward. As clearly shown in FIG. 4, the air control means 8 includes 815 air pumps, an air filter 82, a directional switching valve 83, a pressure regulating valve 84, and the pressure regulating valve 84 and the air passage 7. It includes a connecting part 85 to be connected, an injection machine signal 86 that outputs a signal in synchronization with the timing of the injection machine 2, and a timer nail that switches and controls the direction switching valve 83 based on the output from the injection machine signal 86. ing. This air control means 8 is configured such that when the injection machine 2 fills the mold 3 with molten resin, the timer 87 is inputted by the output of the injection machine signal 86, and the molten resin in the mold 3 is cooled and hardened. By switching the directional control valve 83 from the position A to the cylindrical position while the air conditioner is in this state, compressed air from the air pump 81 can be sent into the through hole 5 of the porous member 60 via the air path 7. It has become. Then, when compressed air is sent into the through hole 5 by the air control means 8, the compressed air is delivered to the through hole 5.
An air layer 10 is formed between the core insert 33 of the male mold part 32 and the molten resin forming the molded product 1, and the air layer 1
0 can suppress the vicinity of the protrusion 11 and the weld line portion 12 along the surface.
なお、前記空気制御手段８は、溶融樹脂が硬化Ｕ ６頁
した頃、前記タイマー８７が方向切換弁８３ ’ｉ位置
胃から位置イに切換えることによって金型３がわの圧縮
空気を外部に排出することができるようになっている。When the molten resin has hardened, the air control means 8 discharges compressed air from the mold 3 to the outside by switching the direction switching valve 83 from position i to position i when the timer 87 It is now possible to do so.
このため、タイマー８７は金型３内の溶融樹脂が冷却さ
れて硬化しているとき及び完全に硬化する頃に、前記方
向切換弁８３を所望位置に切換え制御することができる
ようにセットされている。８８は圧力計、９はエアシー
ルである。For this reason, the timer 87 is set so that the directional switching valve 83 can be controlled to be switched to a desired position when the molten resin in the mold 3 is being cooled and hardened and when it is completely hardened. There is. 88 is a pressure gauge, and 9 is an air seal.
成形品１を成形する場合、金型３内に溶融樹脂を充填し
、その溶融樹脂が次第に冷却硬化するが、そのとき成形
品１は突起１１及びウェルドライン部１２を設けている
ので、光沢にムラが起こるおそれがある。しかし本発明
では、空気制御手段８によシ、溶融樹脂が冷却硬化しつ
つ状態にあるとき、圧縮空気を多孔部材６の貫通孔５に
送シ込み、その圧縮空気が、前記貫通孔５を通過して第
９図及び第１０図に示すように、溶融樹脂と雄型部コア
入子おとの間に空気層１０を形成し、該空気層１０は突
起１１付近並びにフェルドライン部１２ヲ背面から表面
がわに押圧する。その結果、突起１１及びウエル−７１
頁
ドライン部１２を設けた部分が、それらを設けていない
部分と略同じ圧力で形成されるので、成形品１の表面は
シボ１ａを設けていても、光沢を均一にして成形するこ
とができる。しかも成形品１は、その背面が圧縮空気に
よって凹んでも、外観が損われることがない。なお図示
例では、各々の多孔部材６を金型３における突起１１の
リプｌｌｂとリブｌｌｂとの間に配置しているので、多
孔部材６の貫通孔５から圧縮空気を送り込んだとき、空
気層１０がリブｌｌｂ間の範囲内で密閉されて、突起工
１付近及びウェルドライン部１２付近をいっそう均等に
押圧し、そのため、第１１図（ａ） ’＋ （ｂ）に示
す破線の位置の範囲内に多孔部材６ｔｌ−配置すれば、
成形品１表面の光沢をよりいっそう均一にすることがで
きる。また、成形品１の表面にシボ１ａを設けた例を示
したが、シボ１色のみに限らず、ホーニング面を設けて
も、同様の効果を得ることができる。When molding the molded product 1, the mold 3 is filled with molten resin, and the molten resin is gradually cooled and hardened. At this time, the molded product 1 has projections 11 and weld line portions 12, so the molded product 1 has a glossy finish. There is a possibility that unevenness may occur. However, in the present invention, when the molten resin is cooling and hardening, the air control means 8 sends compressed air into the through holes 5 of the porous member 6, and the compressed air flows through the through holes 5. As shown in FIGS. 9 and 10, an air layer 10 is formed between the molten resin and the male mold core insert, and the air layer 10 is formed near the protrusion 11 and around the felt line portion 12. Press the surface from the back. As a result, protrusion 11 and well-71
Since the part provided with the paged line part 12 is formed with approximately the same pressure as the part not provided with them, even if the surface of the molded product 1 is provided with grains 1a, it can be molded with uniform gloss. . Moreover, even if the back surface of the molded product 1 is dented by compressed air, the appearance is not impaired. In the illustrated example, each porous member 6 is arranged between the lip llb and the rib llb of the protrusion 11 in the mold 3, so when compressed air is sent through the through hole 5 of the porous member 6, an air layer is formed. 10 is sealed within the range between the ribs llb, and presses the vicinity of the protrusion 1 and the weld line part 12 more evenly, so that the range of the position of the broken line shown in FIG. 11(a)'+(b) If the porous member 6tl is placed inside,
The gloss on the surface of the molded article 1 can be made even more uniform. Further, although an example has been shown in which the grain 1a is provided on the surface of the molded product 1, the same effect can be obtained not only by providing the grain in one color but also by providing a honed surface.
以上述べたように、本発明によれば、金型内に充填した
溶融樹脂が冷却硬化しつつ状態におるとき、空気制御手
段によシ圧縮空気を多孔部材の貫通孔に送り込んで溶融
樹脂と金型雄型部との間に空気層を形成し、該空気層が
突起及びウェルドライン部を押圧するようにしたので、
突起がわの部分とそうでない部分とを均一な圧力で成形
することができ、従って、成形品の表面の光沢を同じに
させて品質を向上させることができる効果がある。As described above, according to the present invention, when the molten resin filled in the mold is being cooled and hardened, the air control means sends compressed air into the through holes of the porous member to replace the molten resin. An air layer is formed between the mold male part and the air layer presses the protrusion and weld line part, so
It is possible to mold the parts around the protrusions and the parts other than the protrusions with uniform pressure, and therefore the surface of the molded product has the same gloss and has the effect of improving quality.
第１図は従来の射出成形法によって成形された成形品を
示す斜視図、第２図は第１図の■−■線断面図、第３図
は第１図の１１線断面図、第４図は本発明の一実施例を
示す全体図、第５図は金型における成形品に対する多孔
部材の配置関係を示す説明図、第６図は成形品を示す斜
視図、第７図は第６図のｍｖ−ｎｖ線断面図、第８図は
第４図の一部の拡大断面図、第９図は圧縮空気が空気層
を形成した状態を示す第６図のＩ［Ｘ−ＩＩＸ線に相当
する説明用断面図、第１０図は圧縮空気が空気層を形成
した状態を示す第６図のｎｖ ｍｖ線に相当する説明用
断面図、第１１図（ロ））及びΦ）は成形品に対して多
孔部材の最も適切な位置範囲を示す第６図の■−仄−９
頁
線に相当する説明用断面図及び第６図１１Ｘ−ＩＸ線に
相当する説明用断面図である。
！・・・成形品、１＆・・・シボ、１１川突起、１２・
・・ウェルドライン部、３川金型、３２・・・雄型部、
６・・・多孔部、材、５・・・貫通孔、８・・・空気制
御手段、１０・・・空気層。
特許出願人 市光工業株式会社
代理人 弁理士 秋 本 正 実
１０７−
第５閃
第６図
１０８−
第７図
第８図
第９図
第１０図
第１１図
１０９−Fig. 1 is a perspective view showing a molded product molded by the conventional injection molding method, Fig. 2 is a sectional view taken along line ■-■ in Fig. 1, Fig. 3 is a sectional view taken along line 11 in Fig. The figure is an overall view showing one embodiment of the present invention, FIG. 5 is an explanatory view showing the positional relationship of the porous member to the molded product in the mold, FIG. 8 is an enlarged sectional view of a part of FIG. 4, and FIG. 9 is a cross-sectional view taken along line I[X-IIX of FIG. A corresponding explanatory cross-sectional view, Fig. 10 is an explanatory cross-sectional view corresponding to the nv mv line in Fig. 6 showing a state in which compressed air forms an air layer, and Fig. 11 (b)) and Φ) are molded products. ■-9 in Fig. 6 showing the most appropriate position range of the porous member for
FIG. 6 is an explanatory cross-sectional view corresponding to the page line, and FIG. 6 is an explanatory cross-sectional view corresponding to the line X-IX in FIG. ! ... Molded product, 1 & ... Grain, 11 River protrusion, 12.
...weld line part, 3 river mold, 32...male mold part,
6... Porous part, material, 5... Through hole, 8... Air control means, 10... Air layer. Patent Applicant Ichikoh Industries Co., Ltd. Agent Patent Attorney Masami Akimoto 107- 5th Flash Figure 6 108- Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 109-
Claims (1)
よシ、背面に形成した突起と表面に設けたウェルドライ
ン部とを有するシボ部付合成樹脂成形品を形成する射出
成形法において、前記金型の雄型部には成形品の突起付
近及びウェルドライン部と対応する位置に、その成形品
に向う複数の貫通孔を有する多孔部材を夫々配設すると
共゛Ｋ、該各条孔部材の貫通孔に対して圧縮空気を送シ
込む為の空気制御手段を設け、金型内の溶融樹脂が冷却
硬化しクク状態におるとき、前記空気制御手段によって
多孔部材の貫通孔に圧縮空気を送り込み、該圧縮空気が
貫通孔を通って金型雄型部と溶融樹脂との間に空気層を
形成して、該空気層が突起及びウェルドライン部付近５
ｔ、表面がわに抑圧することによシ成形品の表面の光沢
を均一にできるようにしたことを特徴とするシボ等付き
合成樹脂ｉ 成形品の射出成形法。[Claims] By filling a mold with molten resin and cooling and hardening it, a synthetic resin molded product with an embossed part having a protrusion formed on the back side and a weld line part provided on the surface is formed. In the injection molding method, a porous member having a plurality of through holes facing the molded product is disposed in the male part of the mold at a position near the protrusion of the molded product and in a position corresponding to the weld line part. , an air control means is provided for sending compressed air into the through holes of each of the porous members, and when the molten resin in the mold is cooled and hardened to a solid state, the air control means controls the porous members. Compressed air is sent into the through-hole, and the compressed air passes through the through-hole to form an air layer between the male part of the mold and the molten resin, and the air layer forms an air layer near the protrusion and weld line part 5.
t. An injection molding method for a synthetic resin molded product with grains, etc., characterized in that the gloss of the surface of the molded product can be made uniform by suppressing the surface crocodile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525283A JPS608022A (en) | 1983-06-28 | 1983-06-28 | Injection molding of embossed synthetic resin molded piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525283A JPS608022A (en) | 1983-06-28 | 1983-06-28 | Injection molding of embossed synthetic resin molded piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS608022A true JPS608022A (en) | 1985-01-16 |
| JPS6345289B2 JPS6345289B2 (en) | 1988-09-08 |
Family
ID=14658087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11525283A Granted JPS608022A (en) | 1983-06-28 | 1983-06-28 | Injection molding of embossed synthetic resin molded piece |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608022A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0400135A1 (en) * | 1988-12-05 | 1990-12-05 | Robert E Carroll | Injection mold method and apparatus. |
| US5458846A (en) * | 1988-12-05 | 1995-10-17 | Carroll; Robert E. | Method of injection molding |
| US5716560A (en) * | 1995-09-14 | 1998-02-10 | Icp Systems, Inc. | Gas assisted injection molding combining internal and external gas pressures |
| US5972276A (en) * | 1996-10-04 | 1999-10-26 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for the injection molding of a resin |
| US5985188A (en) * | 1998-06-09 | 1999-11-16 | Aero Components, Inc. | Method for manufacturing a chair having separate moldable parts |
| US6294126B1 (en) | 1997-10-04 | 2001-09-25 | Battenfeld Gmbh | Process for controlling gas blanket extent in plastics injection molding |
-
1983
- 1983-06-28 JP JP11525283A patent/JPS608022A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0400135A1 (en) * | 1988-12-05 | 1990-12-05 | Robert E Carroll | Injection mold method and apparatus. |
| US5458846A (en) * | 1988-12-05 | 1995-10-17 | Carroll; Robert E. | Method of injection molding |
| US5643527A (en) * | 1988-12-05 | 1997-07-01 | Icp Systems, Inc. | Method of injection molding |
| US5716560A (en) * | 1995-09-14 | 1998-02-10 | Icp Systems, Inc. | Gas assisted injection molding combining internal and external gas pressures |
| US5972276A (en) * | 1996-10-04 | 1999-10-26 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for the injection molding of a resin |
| US6294126B1 (en) | 1997-10-04 | 2001-09-25 | Battenfeld Gmbh | Process for controlling gas blanket extent in plastics injection molding |
| US5985188A (en) * | 1998-06-09 | 1999-11-16 | Aero Components, Inc. | Method for manufacturing a chair having separate moldable parts |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6345289B2 (en) | 1988-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS608022A (en) | Injection molding of embossed synthetic resin molded piece | |
| EP0778096B1 (en) | Pump housing and a manufacturing method therefor | |
| JP3759614B2 (en) | Metal valve casing | |
| US20100252962A1 (en) | Molding method and molding apparatus | |
| JPS59220337A (en) | Injection molding method of molded article made of synthetic resin having boss part | |
| JPS641052Y2 (en) | ||
| JP2002187143A (en) | Molding tool for foam | |
| US2600942A (en) | Vented mold for the manufacture of footwear | |
| JPH07223246A (en) | Manufacture and device for injection molded plastic product | |
| JP3300531B2 (en) | Injection molding method and its mold | |
| JPS61244514A (en) | Manufacture of foamed molded article | |
| JP3295545B2 (en) | Rubber crawler manufacturing method | |
| KR100299545B1 (en) | Molding apparatus for vacuum forming | |
| JPS608029A (en) | Method and apparatus for injection molding of synthetic resin | |
| KR0174112B1 (en) | Valve housing manufacturing method | |
| JPH03219551A (en) | Cap of storage battery and manufacture thereof | |
| JPH03221424A (en) | Mold device of injection pressure forming and molding method thereof | |
| JPS63120620A (en) | Molding die for lens complex | |
| JPS608025A (en) | Injection molding method of synthetic resin | |
| JPS60193621A (en) | Injection molded product | |
| MY120997A (en) | Combined-type mold for injection molding and method of producing rotary member by the mold | |
| JPS608028A (en) | Injection molding method of box-shaped product | |
| JP2001001108A (en) | Manufacture of metallic mold | |
| JPS60177930A (en) | Method for forming vacuum casting mold provided with core | |
| JPS6010888B2 (en) | Manufacturing method of oil seal with felt |