JPS59227425A - Expansion injection molding method - Google Patents
Expansion injection molding methodInfo
- Publication number
- JPS59227425A JPS59227425A JP58101663A JP10166383A JPS59227425A JP S59227425 A JPS59227425 A JP S59227425A JP 58101663 A JP58101663 A JP 58101663A JP 10166383 A JP10166383 A JP 10166383A JP S59227425 A JPS59227425 A JP S59227425A
- Authority
- JP
- Japan
- Prior art keywords
- mold cavity
- pressure
- molded article
- expansion
- set pressure
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/10—Applying counter-pressure during expanding
- B29C44/105—Applying counter-pressure during expanding the counterpressure being exerted by a fluid
Abstract
Description
【発明の詳細な説明】 本発明は発泡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 foam injection molding method.
従来より、所定の空気内圧を作用させている金型キャビ
ティ内に樹脂を射出するカウンタプレッシャ法による射
出成形法は、アメリカ特許明細書第６２６８６３５号な
どですでに知られているが。Conventionally, an injection molding method using a counterpressure method in which resin is injected into a mold cavity to which a predetermined internal air pressure is applied is already known, such as in US Pat. No. 6,268,635.
カウンタプレッシャ法によって発泡射出成形する場合に
、金型キャビティ内に作用させておく空気圧の大きさや
、金型キャビティ内への発泡性樹脂の射出時における前
記空気圧の抜き方などが不充分であったので、今だ満足
すべき状態の発泡射出成形品を得ることができ々かった
。When performing foam injection molding using the counterpressure method, the amount of air pressure applied within the mold cavity and the method of releasing the air pressure during injection of foamable resin into the mold cavity were insufficient. Therefore, it has not been possible to obtain a foam injection molded product in a satisfactory state.
本発明は、これらの欠点を々＜シ、比較的低発泡ではあ
るが、比較的厚肉の発泡射出成形品を製造する場合に１
表面が極めて平坦できれいな良質の発泡射出成形品を確
実容易に得ることができるようにしたものである。The present invention overcomes these drawbacks and has the following advantages:
This makes it possible to reliably and easily obtain high-quality foam injection molded products with extremely flat and clean surfaces.
つぎに１図面に示した１実施例によって５本発明を説明
する。Next, five aspects of the present invention will be explained based on one embodiment shown in one drawing.
第１図において、１は固定盤、２は可動盤、乙は固定金
型、４は可動金型、５は金型キャビティ。In Fig. 1, 1 is a fixed plate, 2 is a movable plate, O is a fixed mold, 4 is a movable mold, and 5 is a mold cavity.
６は射出用のノズル部である。可動金型４は、押出ロッ
ド７の前後進部を除いて密閉状態にあるエジェクタブロ
ック８を介してｎ」動盤２に数句けられている。９は製
品押出用の数本の押出ピン。6 is a nozzle section for injection. The movable mold 4 is connected to the movable platen 2 via an ejector block 8 which is sealed except for the forward and backward moving portion of the extrusion rod 7. 9 is several extrusion pins for extruding the product.
１０は押出板であり、押出板１０は２図示していない押
出シリンダの押出ロッド７０作用によって後退限にある
ときに、エジェクタブロック８の後端板部８ａに密着さ
せうるようにした。１１は押出版１０の後面またはエジ
ェクタブロック８の後端板部８ａの前面に設けたエンド
レス状のＯリンｆ ｆ ６ リｌ 、 ０リング１１の
作用により、エジェクタブロック８の内部を充分に密封
しうるようにした。Reference numeral 10 denotes an extrusion plate, and the extrusion plate 10 can be brought into close contact with the rear end plate portion 8a of the ejector block 8 when it is at the retracting limit due to the action of an extrusion rod 70 of an extrusion cylinder (not shown). 11 is an endless O-ring provided on the rear surface of the presser 10 or the front surface of the rear end plate portion 8a of the ejector block 8, and the inside of the ejector block 8 is sufficiently sealed by the action of the O-ring 11. I tried to make it wet.
可動金型４または固定金型ろの分割面において。At the dividing surface of the movable mold 4 or the fixed mold filter.
金型キャビティ５の全周には、金型キャビティ５の端面
から例えば２５〜３５ｍのように所望の距離を保ってエ
ンドレスなガス集積溝１２を設け。An endless gas accumulation groove 12 is provided around the entire circumference of the mold cavity 5 at a desired distance from the end face of the mold cavity 5, for example, 25 to 35 m.
金型キャビティ５の端面部とガス集積溝１２の間は１例
えば１幅２０〜６０間で深さ０．０４〜０．０８咽の浅
描１ろを２０〜”０ｆｌｌ＃ｌの間隔を保って多数個設
けた。浅溝１３は、ガスは充分に通すが、樹脂は通らな
いような寸法と形状にした。ガス集積溝１２の外周には
エンドレス状の□ ＩＪング１４を設け、型締時に金型
キャビティ５内を密封状態に保ちうるようにしだ。Between the end face of the mold cavity 5 and the gas accumulation groove 12, maintain a spacing of, for example, a width of 20 to 60 mm and a depth of 0.04 to 0.08 mm. The shallow grooves 13 were dimensioned and shaped to allow sufficient gas to pass through, but not to allow the resin to pass through.An endless □ IJ ring 14 was provided around the outer periphery of the gas accumulation groove 12 to clamp the mold. The interior of the mold cavity 5 can be kept sealed at times.
ガス集積溝１２の底の一部と、エジェクタブロック８の
側板の一部には、それぞれ外部まで伸びている高圧気体
供給排出用の通路１５．１６を設け、この通路１５．１
６には気体圧回路を連結した。気体圧回路において、１
７はコンプレッサや圧力タンクやレギーレータ等からな
る圧気供給源で、 ２０Ｋｇ／ａＡ以上の圧縮空気ま
たは窒素ガス等を供給しうるものである。圧気供給源１
７は、金型キャビティ５内に供給する圧気の圧力を２０
に７／−以上の所望の圧力に設定するだめのＩＪ ＩＪ
−フ弁１８を有する回路１９．圧気の供給排出の切替を
行う三方電磁切替弁２０．コック２１．フレキシブルホ
ース２２等を介して、前記通路１５゜１６に連結した。A portion of the bottom of the gas accumulation groove 12 and a portion of the side plate of the ejector block 8 are provided with passages 15.16 for supplying and discharging high-pressure gas that extend to the outside, respectively.
6 was connected to a gas pressure circuit. In a gas pressure circuit, 1
7 is a pressurized air supply source consisting of a compressor, a pressure tank, a regirator, etc., which can supply compressed air of 20 kg/aA or more, nitrogen gas, etc. Pressure air supply source 1
7 is the pressure of the air supplied into the mold cavity 5 at 20
IJ should be set to the desired pressure of 7/- or more.
- circuit 19 with valve 18; Three-way electromagnetic switching valve that switches the supply and discharge of pressurized air 20. Cook 21. It was connected to the passages 15 and 16 through flexible hoses 22 and the like.
２３は圧力計、２０ａは三方電磁切替弁２０のソレノイ
ドである。23 is a pressure gauge, and 20a is a solenoid of the three-way electromagnetic switching valve 20.
これらの装置を用いて発泡射出成形を行う場合は、まず
、リリーフ弁１８の設定圧を２０Ｋｑ／ａｈ以上１例え
ば、 ２５Ｋｇ／ａ／１のように所望の圧力に設定し
ておく。この設定圧を２０ Ｋｇ ／ ａ？ｒ以上にし
ておくのは、ポリスチレン、ポリプロピレン。When performing foam injection molding using these devices, first, the set pressure of the relief valve 18 is set to a desired pressure of 20 Kq/ah or more, for example, 25 Kg/a/1. Set this pressure to 20 kg/a? Polystyrene and polypropylene should be kept above r.
ＡＢＳ、 ノリル、ナイロン等の樹脂を用いて種々実験
した結果、この設定圧が１７Ｋｇ／ｃｌｒ以下の状態で
発泡成形した場合は１発泡射出成形品の表面に気泡が一
部残り、いわゆる、スワールマークが生じ２表面がきれ
いにならないばかりか、内層部の発泡状態も不均一にな
り、前記設定圧が１７〜１９Ｋｙ／ｉ程度では２発泡射
出成形品の表面が時折きれいでない時が生じるからであ
る。As a result of various experiments using resins such as ABS, Noryl, and nylon, we found that when foam molding is performed at a set pressure of 17 kg/clr or less, some air bubbles remain on the surface of the single foam injection molded product, resulting in so-called swirl marks. This is because not only will the surface of the foamed product not be clean, but the foaming state of the inner layer will also become non-uniform, and if the set pressure is about 17 to 19 Ky/i, the surface of the foamed injection molded product will sometimes not be clean.
なお、コック２１は全開しておいても良いし。Note that the cock 21 may be left fully open.
適宜所望の開度にしておいても良い。The opening may be set to a desired degree as appropriate.
この状態で型締を行い、第１図に示すような状態にする
。この状態では、固定金型ろと可動金型４０分割面にあ
る０リング１４の作用で、金型キャビティ５内やガス集
積溝１２内は外気から密閉され、ｆ、た。エジェクタボ
ックス８内も押出板１０の後面のＱ ＩＪタング１の作
用で外気から密閉されている。なお、金型キャビティ５
内とエジェクタボックス８内は、可動金型４内を貫通し
ている押出ビン９の外周の極めて狭いすき間を介して連
通しているが、これは伺らさしつかえはない。In this state, the mold is clamped to create the state shown in FIG. In this state, the inside of the mold cavity 5 and the inside of the gas accumulation groove 12 are sealed from the outside air by the action of the O-ring 14 on the dividing surface of the fixed mold funnel and the movable mold 40, f. The inside of the ejector box 8 is also sealed from the outside air by the action of the QIJ tongue 1 on the rear surface of the extrusion plate 10. In addition, mold cavity 5
The interior of the ejector box 8 communicates with the inside of the ejector box 8 through an extremely narrow gap on the outer periphery of the extrusion bottle 9 that passes through the interior of the movable mold 4, but this is not a problem.
つぎに、三方電磁切替弁２０のソレノイド２０ａを励磁
させて、三方電磁切替弁２０を切替える。Next, the solenoid 20a of the three-way electromagnetic switching valve 20 is excited to switch the three-way electromagnetic switching valve 20.
そうすれば、圧気供給源１７やＩＪ リーフ弁１８の作
用により、金型キャビティ５内とエジェクタボックス８
内に高圧の圧縮空気まだは窒素ガス等の圧気が供給され
る。そして、金型キャビティ５内等は、リリーフ弁１８
で設定されている２０に一以上の所望の気体圧に保たれ
る。By doing so, the inside of the mold cavity 5 and the ejector box 8 are
High-pressure compressed air or pressurized air such as nitrogen gas is supplied inside the chamber. A relief valve 18 is provided inside the mold cavity 5, etc.
The desired gas pressure is maintained at 1 to 20 or more.
金型キャビティ５内が確実に所望圧力に々ったら、射出
用のノズル部６を開いて１発泡剤を樹脂に均一に混合し
た発泡成樹脂の可塑化溶融したものを金型キャビティら
内に射出する。この場合。Once the inside of the mold cavity 5 has reached the desired pressure, the injection nozzle 6 is opened and a plasticized and molten foamed resin with a foaming agent uniformly mixed with the resin is injected into the mold cavity. eject. in this case.
金型キャビティ５内には圧気が充満しているので。Because the mold cavity 5 is filled with pressure air.
圧気の作用により２発泡性樹脂の発泡が押えられ続けた
状態で１発泡性樹脂は金型キャビティ５内に充填されて
いく。したがって２発泡作用による気泡が介抱性樹脂の
表面にあられれることはない。The first foamable resin is filled into the mold cavity 5 while the foaming of the second foamable resin is continued to be suppressed by the action of the pressurized air. Therefore, bubbles due to the two-foaming action will not form on the surface of the entraining resin.
なお２発泡性樹脂が金型キャビティ５内に充填されるに
従い、金型キャビティ５内の圧気はその分だけリリーフ
弁１８７ｉｌ−通って外気へ排出される。Note that as the mold cavity 5 is filled with the foamable resin, the pressurized air in the mold cavity 5 is discharged to the outside air through the relief valve 187il.
樹脂としては、ポリスチレン、ポリプロピレン。Polystyrene and polypropylene are used as resins.
ＡＢＳ、ノリル、ナイロン等を適宜用いることができる
し１発泡剤としては２例えば、アゾジカルバマイドのよ
うな一般の発泡成形のときに用いられる発泡剤を用いる
ことができる。勿論、射出装置のスクリュを内蔵した加
熱筒内で、射出装置に別々に供給した樹脂と発泡剤を混
合しな、がら可塑化射出しても良いし、樹脂と発泡剤を
あらかじめ均一に混合したものを射出装置内に供給して
可塑化射出しても良い。ABS, Noryl, nylon, etc. can be used as appropriate.1 As the blowing agent, for example, a blowing agent used in general foam molding such as azodicarbamide can be used. Of course, it is also possible to plasticize and inject the resin and foaming agent, which are separately supplied to the injection device, without mixing them, in a heating cylinder with a built-in screw, or by uniformly mixing the resin and foaming agent in advance. The material may be supplied into an injection device and plasticized and injected.
このような射出工程において、可塑化されている発泡性
樹脂が、金型キャビティ５内に、金型キャビティ５の容
積の８０〜９０％充填されたとき。In such an injection process, when the mold cavity 5 is filled with 80 to 90% of the volume of the mold cavity 5 with plasticized foamable resin.
三方電磁切替弁２０のソレノイド２０ａを消磁させ、三
方電磁切替弁２ｏを図示した状態に瞬時にビティ５内に
所望の係だけ充填されたことは、射出装置中のスクリー
等の前進動作から、リミットスイッチの作動等によって
電気的に検知することができるし、その指令信号によっ
て三方電磁切替弁２０の切替を行うことができる。The fact that the solenoid 20a of the three-way electromagnetic switching valve 20 is demagnetized and the three-way electromagnetic switching valve 2o is instantly filled to the desired amount in the bitty 5 in the state shown in the figure is due to the forward movement of the scree in the injection device. It can be electrically detected by actuation of a switch, etc., and the three-way electromagnetic switching valve 20 can be switched based on the command signal.
金型キャビティ５内に発泡性樹脂が８０〜９゜多充填さ
れたとき、金型キャビティ５内の圧気をいつきに抜けば
、それまで圧気のだめに発泡するのを押えられていた発
泡性樹脂はただちに発泡を始める。そして２発泡性樹脂
体の内層部のみが発泡する。発泡性樹脂体の外面層は、
射出中に、内層部に比べて温度が幾分低下し凝固し始め
ており。When the mold cavity 5 is filled with foamable resin at an angle of 80 to 9 degrees, if the pressure inside the mold cavity 5 is suddenly released, the foamable resin, which was previously prevented from foaming due to the pressure, will be removed. Begin foaming immediately. Then, only the inner layer of the two foamable resin bodies foams. The outer layer of the foamable resin body is
During injection, the temperature drops somewhat compared to the inner layer and it begins to solidify.
かつ、圧気の圧力が急速に低下し終るとすぐに。And as soon as the air pressure has finished dropping rapidly.
発泡性樹脂体の外面層は金型キャビティ５の内面まで到
達し、射出圧力の作用で金型キャビティ５の内面に強く
押付けられるので１発泡作用は行われず、しだがって１
発泡成形品の表面部にはスキン層ができ２表面は極めて
滑らかで、スワールマークなども生じないきれいな状態
になる。なお。The outer surface layer of the foamable resin body reaches the inner surface of the mold cavity 5 and is strongly pressed against the inner surface of the mold cavity 5 by the action of the injection pressure, so that no foaming action takes place;
A skin layer is formed on the surface of the foam molded product, resulting in an extremely smooth surface with no swirl marks or the like. In addition.
発泡倍率は１．０４〜１．０６程度になる。The expansion ratio will be about 1.04 to 1.06.
キビテイ５内に充満し終るまでの短い時間内に。Within a short period of time until Kivitei 5 is fully filled.
キャビティ５内に作用していた圧気を１例えば０．１に
り／Ｃ１１１Ｇ以下のように、はぼ大気圧と同じ程度の
圧力にすることである。その間の時間は、金型キャビテ
ィ５の容積や射出条件等にもよるが。The purpose is to reduce the pressure acting in the cavity 5 to 1, for example, 0.1 N/C111G or less, which is approximately the same as atmospheric pressure. The period of time depends on the volume of the mold cavity 5, injection conditions, etc.
１〜２秒程度以内が良い。なお、圧気をゆっくり抜きす
ぎると２発泡性樹脂の内部の気泡が粗大になったり１表
面にスワールマークができ、たりする。It is best to wait within about 1 to 2 seconds. Note that if the pressure is released too slowly, the bubbles inside the foamable resin will become coarse and swirl marks will be formed on the surface.
種々実験した結果、前記したいずれの樹脂を用いた場合
においても、射出時に金型キャビティ５内に気体圧を作
用させておく力゛ウンタ圧が２０に７／ ａＡ以上であ
れば、金型キャビティ５内に発泡性樹脂が８０〜９０チ
充填されたとき、金型キャビティ５内の圧気をいつきに
抜けば、内層部は比較的低発泡ではあるが適度に発泡し
１表面は極めて滑らかで、スワールマークやひけなども
なく、きれいな発泡射出成形品を確実容易に得ることが
できだ。なお、射出中に金型キャビティ５内の圧気を抜
く時、金型キャビティ５内への発泡性樹脂の充填率が約
７５％以下だと、圧気の作用が充分で力＜９発泡成形品
の表面にスワールマークが生じ。As a result of various experiments, no matter which of the above-mentioned resins is used, as long as the counter pressure for applying gas pressure inside the mold cavity 5 during injection is 20 to 7/aA or more, the mold cavity When the mold cavity 5 is filled with 80 to 90 pieces of foamable resin, if the pressure inside the mold cavity 5 is suddenly released, the inner layer will be moderately foamed, although the foaming will be relatively low, and the surface will be extremely smooth. You can reliably and easily obtain clean foam injection molded products without swirl marks or sink marks. When releasing the pressure air in the mold cavity 5 during injection, if the filling rate of the foamable resin into the mold cavity 5 is less than about 75%, the action of the pressure air is sufficient and the force < 9 of the foamed molded product. Swirl marks appear on the surface.
充填率が約９５係以上だと、圧気によって最後まで発泡
が押えられた状態になるので２発泡がほとんど行われな
かった。また、充填率が７５チを越えて８０％未満およ
び９０％を越えて９５チ未満だと、成形品の表面状態な
いしは発泡状態が不安定になり、必ずしも充分満足のい
くような発泡射出成形品を得ることができなかった。When the filling rate was about 95% or more, the foaming was suppressed to the end by the air pressure, so that the second foaming was hardly performed. In addition, if the filling rate exceeds 75 inches and is less than 80%, or exceeds 90% and less than 95 inches, the surface condition or foaming state of the molded product will become unstable, and the foam injection molded product will not necessarily be completely satisfactory. I couldn't get it.
このように１本発明においては、特許請求の範囲に記載
したような方法にしたので１表面が極めて滑らかできれ
いな発泡射出成形品を確実容易に得ることができる。ま
た、比較的簡単な装置を用いることができ、操作も極め
て簡単で、自動化も容易に行うことができ、従来より用
いられている射出成形機をほとんどそのまま用いること
ができるなど、極めて実用的である。さらに１発泡射出
成形品の表面が極めて平滑できれいだと、そのまま塗装
やホットスタンピングなどの後作業を行っても、良好な
製品を得ることができ、後工程の手間もおおいに省略さ
れる。As described above, in the present invention, since the method described in the claims is employed, it is possible to reliably and easily obtain a foam injection molded product with an extremely smooth and clean surface. In addition, it is extremely practical, as it uses relatively simple equipment, is extremely easy to operate, can be easily automated, and can be used with conventional injection molding machines almost as is. be. Furthermore, if the surface of the single-foam injection molded product is extremely smooth and clean, even if post-work such as painting or hot stamping is performed, a good product can be obtained, and the labor of post-processing can be greatly reduced.
第１図は本発明の方法を実施するだめの装置の１実施例
を示す縦断面図および気体用回路図である。
１・・・・固定盤、２・・・・可動盤、ろ・・・・固定
金型、４・・・・可動金型１５・・・・金型キャビティ
、６・・・・ノズル部、８・・・・エジェクタボックス
、？・・・・押出ピン、１０・・・・押出板。
１１．１４・・・・Ｏリング、１２・・・・ガス集積溝
、１乙・・・・浅溝、１７・・・・圧気供給源。
１８・・・・ＩＪ ＩＪ−フ弁、２０・・・・三方電磁
切替弁
特許出願人 宇部興産株式会社
第１図FIG. 1 is a longitudinal sectional view and a gas circuit diagram showing an embodiment of an apparatus for carrying out the method of the present invention. 1... Fixed plate, 2... Movable plate, Ro... Fixed mold, 4... Movable mold 15... Mold cavity, 6... Nozzle part, 8...Ejector box? ...Extrusion pin, 10...Extrusion plate. 11.14...O-ring, 12...Gas accumulation groove, 1B...Shallow groove, 17...Pressure air supply source. 18...IJ IJ-fu valve, 20...Three-way electromagnetic switching valve Patent applicant Ube Industries, Ltd. Figure 1
Claims (1)
ャビティ内に発泡性樹脂を射出し金型キャビティ内に発
泡性樹脂が８０〜９０チ光填されたとき、金型キャビテ
ィ内の前記気体内圧を急速に低下させ、金型キャビティ
内に充填された発泡性樹脂の内部層を発泡状態にし、外
面層をスキン層にするようにした発泡射出成形法。When the foamable resin is injected into the mold cavity on which the internal gas pressure of 2oK, q/- or more is applied, and the foamable resin is filled into the mold cavity with 80 to 90 parts, the above-mentioned gas inside the mold cavity A foam injection molding method in which the internal gas pressure is rapidly lowered, the inner layer of foamable resin filled in the mold cavity becomes foamed, and the outer surface layer becomes a skin layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58101663A JPS59227425A (en) | 1983-06-09 | 1983-06-09 | Expansion injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58101663A JPS59227425A (en) | 1983-06-09 | 1983-06-09 | Expansion injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59227425A true JPS59227425A (en) | 1984-12-20 |
| JPH0122132B2 JPH0122132B2 (en) | 1989-04-25 |
Family
ID=14306608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58101663A Granted JPS59227425A (en) | 1983-06-09 | 1983-06-09 | Expansion injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59227425A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5093053A (en) * | 1987-07-01 | 1992-03-03 | Battenfeld Gmbh | Method of manufacturing multiple-layer molded articles of thermoplastic material |
| JP2009039954A (en) * | 2007-08-09 | 2009-02-26 | Kaneka Corp | Mold for injection foam molding and method for manufacturing injection foam molded product using the mold |
| US8517197B2 (en) | 2006-07-19 | 2013-08-27 | Du Pont-Mitsui Polychemicals Co., Ltd. | Synthetic resin hollow body |
| US8691128B2 (en) | 2004-11-09 | 2014-04-08 | Prime Polymer Co., Ltd | Expansion injection molding process and mold for expansion injection molding |
| CN110696267A (en) * | 2019-10-22 | 2020-01-17 | 苏州兆如电子有限公司 | Foaming injection molding method of television bracket |
| WO2020213457A1 (en) * | 2019-04-19 | 2020-10-22 | 鈴木 康公 | Molding die apparatus for resin molded products, molding apparatus, molding system, and manufacturing method for molded products |
-
1983
- 1983-06-09 JP JP58101663A patent/JPS59227425A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5093053A (en) * | 1987-07-01 | 1992-03-03 | Battenfeld Gmbh | Method of manufacturing multiple-layer molded articles of thermoplastic material |
| US8691128B2 (en) | 2004-11-09 | 2014-04-08 | Prime Polymer Co., Ltd | Expansion injection molding process and mold for expansion injection molding |
| US8517197B2 (en) | 2006-07-19 | 2013-08-27 | Du Pont-Mitsui Polychemicals Co., Ltd. | Synthetic resin hollow body |
| JP2009039954A (en) * | 2007-08-09 | 2009-02-26 | Kaneka Corp | Mold for injection foam molding and method for manufacturing injection foam molded product using the mold |
| WO2020213457A1 (en) * | 2019-04-19 | 2020-10-22 | 鈴木 康公 | Molding die apparatus for resin molded products, molding apparatus, molding system, and manufacturing method for molded products |
| CN113710449A (en) * | 2019-04-19 | 2021-11-26 | 铃木康公 | Mold device for resin molded article, molding device, molding system, and method for producing molded article |
| CN110696267A (en) * | 2019-10-22 | 2020-01-17 | 苏州兆如电子有限公司 | Foaming injection molding method of television bracket |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0122132B2 (en) | 1989-04-25 |
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