JP2638807B2 - Hot runner type injection molding machine - Google Patents
Hot runner type injection molding machineInfo
- Publication number
- JP2638807B2 JP2638807B2 JP62130928A JP13092887A JP2638807B2 JP 2638807 B2 JP2638807 B2 JP 2638807B2 JP 62130928 A JP62130928 A JP 62130928A JP 13092887 A JP13092887 A JP 13092887A JP 2638807 B2 JP2638807 B2 JP 2638807B2
- Authority
- JP
- Japan
- Prior art keywords
- gate
- torpedo
- tip
- injection molding
- hot runner
- 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
- 238000001746 injection moulding Methods 0.000 title claims description 17
- 239000011347 resin Substances 0.000 claims description 34
- 229920005989 resin Polymers 0.000 claims description 34
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- 238000000465 moulding Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 6
- 230000001154 acute effect Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
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)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は溶融樹脂の流通部にヒータを配し、樹脂を溶
融状態を保持しながら加圧流動させてゲート部を通して
金型キャビティに圧入させ成形を行うホットランナー式
射出成形装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention arranges a heater in a flow section of a molten resin, pressurizes and flows the resin while maintaining a molten state, and press-fits the resin into a mold cavity through a gate section. The present invention relates to a hot runner type injection molding device for performing molding.
本発明はホットランナー式射出成形装置であって、金
型のゲート部に臨むトーピード先端部を30゜以下の先鋭
角に形成し、ゲート部におけるゲートの内周面とトーピ
ード先端部との対向面の延長線で形成される角度を15゜
超、45゜以下の範囲にすることにより、ゲート開き角度
を変更することなくゲート部の強度を維持し、かつ、樹
脂流動部が拡大され、成形時における樹脂流動が良好と
なり、低射出圧での成形が可能となると共に成形品内の
残留応力が小さく、成形歪の減少を可能とするものであ
る。The present invention relates to a hot runner type injection molding apparatus, in which a torped end facing a gate portion of a mold is formed at an acute angle of 30 ° or less, and a facing surface between the inner peripheral surface of the gate and the torpedo tip portion in the gate portion. When the angle formed by the extension of the line is in the range of more than 15 ° and 45 ° or less, the strength of the gate part is maintained without changing the gate opening angle, and the resin flow part is enlarged, In this case, the resin flow becomes good, molding at a low injection pressure becomes possible, and the residual stress in the molded product is small, so that molding distortion can be reduced.
〔従来の技術〕 従来、ホットランナー式射出成形装置は、例えば実公
昭60−18904号公報に開示されるように、マニホールド
に形成した溶融樹脂流通部と金型のキャビティのゲート
部間の樹脂流通部内にヒータを内蔵した尖鋭発熱体が、
その先端部をゲート部に臨ませて配置されてランナー内
の樹脂を加熱して溶融状態に保持したり、ゲート部分の
固化樹脂を加熱して溶融し、ゲートを開いて射出樹脂の
間歇的な射出成形操作を行い溶融樹脂をキャビティ内に
射出注入して成形するように構成されている。[Related Art] Conventionally, as disclosed in Japanese Utility Model Publication No. 60-18904, for example, a hot runner type injection molding apparatus has a resin flow passage between a molten resin flow portion formed in a manifold and a gate portion of a mold cavity. A sharp heating element with a built-in heater inside
Heating the resin in the runner and holding it in a molten state, or heating and melting the solidified resin in the gate part, opening the gate and opening the gate intermittently It is configured to perform an injection molding operation to inject and inject a molten resin into a cavity to perform molding.
このように構成されるホットランナー式射出成形装置
は前述の如くゲート部を開閉させるため尖鋭発熱体には
先端の出来るだけ近くまでヒータを配する必要がある。
しかし、ヒータの熱効率からその大きさを小さくするこ
とには限界があり、またヒータを先端に近づけるのも発
熱体の肉厚が薄くなり、強度的な限界もある。In the hot runner type injection molding apparatus configured as described above, it is necessary to arrange a heater as close as possible to the tip of the sharp heating element in order to open and close the gate as described above.
However, there is a limit to reducing the size of the heater due to the thermal efficiency of the heater, and there is also a limit to the strength of bringing the heater closer to the tip because the thickness of the heating element becomes thinner.
これらの条件を兼ねそなえるためには尖鋭発熱体の尖
鋭先端部の先端部分は細くしてもその元部が太い円錘形
状となり、これに伴ってこの周囲に樹脂流動部を充分取
るためにはゲート部の開き角である内側テーパ角を大き
く、即ち金型のゲート部のエッヂ角度を小さくする必要
があるが、このエッヂ角度を小さくすると、この部分の
金型強度が低下することになり、このためゲート部の内
側テーパ角にも限界角度がある。In order to satisfy both of these conditions, even if the tip of the sharp tip of the sharp heating element is thin, its base becomes a thick conical shape. It is necessary to increase the inner taper angle, which is the opening angle of the gate portion, that is, to reduce the edge angle of the gate portion of the mold, but if this edge angle is reduced, the mold strength of this portion will decrease, For this reason, there is also a limit angle in the inner taper angle of the gate portion.
このように従来のホットランナー式射出成形装置にお
いてはゲート部分に構造的に各種の制限が伴うので樹脂
の射出圧、ゲート切れ、ゲート開閉性の最適条件に対す
る調整巾が狭くそのため成形適応範囲が狭くなり、また
ゲート部分の樹脂流動部が小狭であるため射出圧減衰が
多く装置のシリンダーの射出圧力を高める必要があり、
このことが原因で成形品内の残留応力が大きくなって成
形品に歪、即ち反り変形が生じるおそれがある。As described above, in the conventional hot runner type injection molding apparatus, the gate portion has various structural limitations, so that the adjustment range for the optimum conditions of the injection pressure of the resin, the gate breakage, and the gate opening / closing property is narrow, and therefore the molding applicable range is narrow. In addition, because the resin flow area at the gate is small, injection pressure attenuation is large and it is necessary to increase the injection pressure of the cylinder of the device.
Due to this, there is a possibility that residual stress in the molded article increases and distortion, that is, warpage deformation occurs in the molded article.
本発明はかかる点に鑑み、ゲート部の開き角度、即
ち、内側テーパ角を変更することなくゲート部分の樹脂
流動部が拡大されて樹脂流動を良好にすると共にゲート
部における樹脂に対するトーピードの熱効率を向上させ
るようにしたホットランナー式射出成形装置を提供する
ことを目的とする。In view of the foregoing, the present invention provides a gate opening angle, that is, the resin flow portion of the gate portion is enlarged without changing the inner taper angle, thereby improving the resin flow and reducing the thermal efficiency of torpedo with respect to the resin in the gate portion. It is an object of the present invention to provide a hot runner type injection molding device which is improved.
前述した問題を解決するために本発明は、溶融樹脂の
流通路からゲート部に連続して内部加熱形トーピードを
配してなるホットランナー式射出成形装置において、ト
ーピードのゲート部に臨むトーピード先端部を30゜以下
の先鋭角に形成し、ゲート部におけるゲート部における
ゲートの内周面とトーピード先端部との間で形成される
樹脂流動部は、キャビティ側が狭くなるように成形さ
れ、ゲートの内周面とトーピード先端部との対向面の延
長線で形成される角度を15゜超、45゜以下の範囲にした
ものである。In order to solve the above-mentioned problem, the present invention relates to a hot runner type injection molding apparatus in which an internally heated torpedo is arranged continuously from a flow path of a molten resin to a gate portion, and a torpedo end portion facing a topeed gate portion is provided. Is formed at an acute angle of 30 ° or less, and a resin flowing portion formed between the inner peripheral surface of the gate and the tip of the torpedo at the gate portion in the gate portion is formed so that the cavity side is narrowed. The angle formed by the extension of the facing surface between the peripheral surface and the tip of the torpedo is in the range of more than 15 ° and 45 ° or less.
〔作用〕 ホットランナー式射出成形装置において、トーピード
のゲート部に臨むトーピード先端部を30゜以下の先鋭角
に形成し、ゲート部におけるゲートの内周面とトーピー
ド先端部との対向面の延長線で形成される角度を15゜
超、45゜以下の範囲にすることにより、ゲート部の強度
を維持するとともに、ゲート部における樹脂流動エリア
はゲート部の開き角度を拡大することなく充分とること
ができて溶融樹脂の流動が円滑に行われ低射出圧による
成形が可能となり、従来装置に比し種々の利点がある。[Action] In a hot runner type injection molding apparatus, the tip of the torpedo facing the gate of the torpedo is formed at a sharp angle of 30 ° or less, and an extension of the facing surface between the inner peripheral surface of the gate and the tip of the torpedo at the gate. By setting the angle formed in the range of more than 15 ° and 45 ° or less, the strength of the gate portion is maintained, and the resin flow area in the gate portion can be sufficient without increasing the opening angle of the gate portion. As a result, the flow of the molten resin is performed smoothly, and molding with a low injection pressure becomes possible, and there are various advantages as compared with the conventional apparatus.
以下、本発明の一実施例を図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
図において（１）は固定側取付け板でこの下側にスペ
ーサーブロック（２）を介して受け板（３）が固定さ
れ、この受け板（３）の下面にキャビティＣを形成する
金型（４）が取付けられている。In the figure, (1) is a fixed-side mounting plate, on which a receiving plate (3) is fixed via a spacer block (2), and a mold (4) for forming a cavity C on the lower surface of the receiving plate (3). ) Is installed.
この、取付け板（１）と受け板（３）との間にはマニ
ホールド（５）を配し、受け板（３）に対してセンター
ピン（６）により位置決めし、セットボルト（７）によ
り固着する。このマニホールド（５）に形成されるスブ
ルー部（流通路）（８）は取付け板（１）に設置された
ロケートリング（９）にスブルーブッシュ（10）を介し
て連通され、このスブルー部（８）のノズル（8a）側に
はランナーブッシュ（11）が嵌着されて金型（４）のゲ
ート部（12）に連通されており、このマニホールド
（５）にはヒータ（13）が装填されて常時加熱されてい
る。A manifold (5) is arranged between the mounting plate (1) and the receiving plate (3), is positioned with respect to the receiving plate (3) by a center pin (6), and is fixed by a set bolt (7). I do. A subroutine (flow passage) (8) formed in the manifold (5) is communicated through a subroutine bush (10) to a locate ring (9) installed on the mounting plate (1). The runner bush (11) is fitted to the nozzle (8a) side of 8) and communicates with the gate (12) of the mold (4). The heater (13) is loaded in this manifold (5). It has been constantly heated.
そして、マニホールド（５）にはスブルー部（８）の
ノズル（8a）からランナーブッシュ（11）に挿通され、
金型（４）のゲート部（12）に達するトーピード（14）
が備えられており、このトーピード（14）は内部にヒー
タ（15）が内蔵され、ゲート部（12）の漏斗状に形成さ
れるゲート（12a）に臨むトービード先端部、即ちゲー
トチップ部（14a）は尖鋭状に形成してあり、本例にお
いてはこのトーピード（14）の先端ゲートチップ部（14
a）は先端角θ１は30゜以下で逆円錐形に形成してあ
る。また、金型（４）のゲート（12a）の開き角θ２は
従来のものと同じで60゜〜120゜に形成されている。Then, the manifold (5) is inserted into the runner bush (11) from the nozzle (8a) of the sub blue part (8),
Torpedo (14) reaching the gate (12) of the mold (4)
The torpedo (14) has a built-in heater (15) inside, and the tip of the torpedo facing the gate (12a) formed in a funnel shape of the gate (12), that is, the gate tip (14a). ) Is formed in a sharp shape. In this example, the tip gate tip (14) of the torpedo (14) is formed.
a) the tip angle theta 1 is is formed on the inverted cone at 30 ° or less. Moreover, the opening angle theta 2 of the gate (12a) of the mold (4) is same as 60 ° to 120 ° formed with the conventional.
従ってトーピード（14）のゲートチップ部（14a）の
外周面とゲート部（12）のゲート（12a）の内周面との
間に樹脂流動部は、θ２−θ１即ち で15゜〜45゜の範囲となって広く形成されることにな
る。即ち、トーピード（14）の先端ゲートチップ部（14
a）を出来るだけ鋭角で小体積にすることによってゲー
ト（12a）との間の樹脂流動エリアが充分とれることに
なる。Therefore, between the outer peripheral surface of the gate tip portion (14a) of the torpedo (14) and the inner peripheral surface of the gate (12a) of the gate portion (12), the resin flowing portion is θ 2 −θ 1, Thus, it is formed in a wide range of 15 to 45 degrees. In other words, the tip gate tip (14) of the torpedo (14)
By making a) as acute as possible and having a small volume, a sufficient resin flow area with the gate (12a) can be obtained.
また、このようにトーピード（14）の先端ゲートチッ
プ部（14a）を鋭角に形成することはこのゲートチップ
部（14a）の元部径が細くなってトーピード（14）に内
蔵されるヒータ（15）が先端側から離れるが、ゲートチ
ップ部（14a）の先端側の体積は小さいので熱効率も良
好となる。In addition, forming the tip gate tip portion (14a) of the torpedo (14) at an acute angle in this manner makes the base portion of the gate tip portion (14a) thinner so that the heater (15 ) Is separated from the tip side, but since the volume at the tip side of the gate chip portion (14a) is small, the thermal efficiency is also improved.
なお、図中（16）は受け板（３）及び金型（４）に穿
設された冷却水孔である。In the drawing, (16) is a cooling water hole formed in the receiving plate (3) and the mold (4).
以上のように構成される射出成形装置は溶融樹脂が固
定側取付け板（１）に設置されたロケートリング（９）
からスブルーブッシュ（10）を介してマニホールド
（５）のスブルー部（８）を流通してランナーブッシュ
（11）から金型（４）のゲート部（12）に達し、ゲート
（12a）から金型（４）のキャビティＣ内に射出圧入さ
れ、所望の成形製品が得られる。In the injection molding apparatus configured as described above, the locate ring (9) in which the molten resin is installed on the fixed-side mounting plate (1).
From the runner bush (11) to the gate (12) of the mold (4) via the subroutine bush (10) through the subroutine bush (10), and the metal from the gate (12a). It is injection-pressed into the cavity C of the mold (4) to obtain a desired molded product.
この成形において溶融樹脂はマニホールド（５）のス
ブルー部（８）からランナーブッシュ（11）内をトーピ
ード（14）に沿って流通されるのでトーピード（14）内
のヒータ（15）によって有効に加熱されると共にゲート
部（12）のゲート（12a）内においても熱効率の良好な
ゲートチップ部（14a）によって加熱されて溶融状態が
維持され、また、トーピード（14）の先端ゲートチップ
部（14a）とゲート（12a）との間の樹脂流動エリアはゲ
ート径を大きくすることなく充分とることが出来ること
により、溶融樹脂の流通性が改善されて低い射出圧で流
通させることが出来ると共にこの流通性の改善により射
出圧力の残圧が低減されてゲート（12a）内における圧
力歪が少くなり、ゲート切れも向上される。さらに、こ
の樹脂流通性の改善により従来の射出成形装置に比し低
い射出圧力、射出時間の短縮を図ることができて成形サ
イクルタイムの短縮も可能となる。例えば従来装置にお
いては射出圧力126kg/cm2、射出時間2.1secに対して本
例装置では射出圧力98kg/cm2、射出時間1.5secで成形さ
れることになる。In this molding, the molten resin flows from the sblue portion (8) of the manifold (5) through the runner bush (11) along the torpedo (14), so that it is effectively heated by the heater (15) in the torpedo (14). In the gate portion (12) of the gate portion (12), the molten state is maintained by being heated by the gate tip portion (14a) having good thermal efficiency, and the gate tip portion (14a) of the torpedo (14) is kept in a molten state. Since the resin flow area between the gate (12a) and the gate (12a) can be made sufficient without increasing the gate diameter, the flowability of the molten resin is improved, and the flow of the molten resin can be performed at a low injection pressure. By the improvement, the residual pressure of the injection pressure is reduced, the pressure distortion in the gate (12a) is reduced, and the disconnection of the gate is also improved. Further, by improving the resin flowability, an injection pressure and an injection time lower than those of the conventional injection molding apparatus can be reduced, and the molding cycle time can be shortened. For example, molding is performed at an injection pressure of 98 kg / cm 2 and an injection time of 1.5 seconds in the apparatus of the present example, while the injection pressure is 126 kg / cm 2 and the injection time is 2.1 seconds in the conventional apparatus.
また、金型（４）のゲート（12a）はそのゲート径を
大きく、即ちゲート開き角度を小さくする必要がないの
で金型（４）のゲート部周辺が肉薄となって強度が低下
してクラックが生じる等のおそれがなく長期の繰返し使
用に充分耐える。Further, the gate (12a) of the mold (4) has a large gate diameter, that is, it is not necessary to reduce the gate opening angle. There is no danger of occurrence of cracks, etc., and it can withstand long-term repeated use.
以上は本発明の一例であって本発明はこの実施例に限
定されているものではなく、本発明の要旨を逸脱しない
範囲で変更できるものである。The above is an example of the present invention, and the present invention is not limited to this embodiment, and can be changed without departing from the gist of the present invention.
以上のように本発明によれば溶融樹脂の流通路からゲ
ート部に連続して内部加熱形トーピードを配し、ゲート
部に対応するトーピード先端部を30゜以下の先鋭角度に
形成し、ゲート部におけるゲートの内周面とトーピード
先端部との間で形成される樹脂流動部は、キャビティ側
が狭くなるように形成され、ゲートの内周面とトーピー
ド先端部との対向面の延長線で形成される角度を15゜
超、45゜以下の範囲にしたことにより、ゲート部の強度
を維持し、かつ、樹脂流通エリアを充分とることが出来
て溶融樹脂の流通が円滑に行われ、低射出圧での成形が
可能となって取数を増加でき、またゲート切れが良好と
なり、成形品内の残留応力が小さくなって成形歪が減少
されて良質の成形品が得られる。As described above, according to the present invention, an internally heated torpedo is disposed continuously from the flow path of the molten resin to the gate portion, and the tip of the torpedo corresponding to the gate portion is formed at a sharp angle of 30 ° or less, and the gate portion is formed. The resin flowing portion formed between the inner peripheral surface of the gate and the tip of the torpedo is formed so that the cavity side becomes narrower, and is formed by an extension of the facing surface between the inner peripheral surface of the gate and the torpedo tip. By setting the angle to be in the range of more than 15 ° and 45 ° or less, the strength of the gate portion can be maintained and the resin distribution area can be sufficiently secured, and the flow of the molten resin can be performed smoothly, and the low injection pressure can be obtained. In this case, the number of moldings can be increased, the number of workpieces can be increased, the breakage of the gate can be improved, the residual stress in the molded product can be reduced, and the molding distortion can be reduced to obtain a high-quality molded product.
しかもトーピード先端部は鋭角で元部も細く形成され
ることにより熱効率が良好でトーピードの加熱、非加熱
によるゲート部における樹脂の溶融、固化が確実に行わ
れてゲート開閉性も良好となり、従って樹脂射出圧ゲー
ト切れ、ゲート開閉性の最適条件調整幅を広くとること
ができて所望の成形品が容易に得られるホットランナー
式射出成形装置を提供できる。In addition, the torpedo tip is formed at an acute angle and the base is thin, so that the thermal efficiency is good and the torpedo is heated and non-heated so that the resin in the gate is reliably melted and solidified, and the gate opening / closing property is also improved. It is possible to provide a hot runner type injection molding apparatus which can provide a wide range of adjustment of optimum conditions for injection pressure gate breakage and gate opening / closing properties and can easily obtain a desired molded product.
第１図は本発明によるホットランナー式射出成形装置の
一例の要部の拡大断面図、第２図は同、射出成形装置の
一例の一部截断正面図である。 図中（４）は金型、Ｃはキャビティ、（５）はマニホー
ルド、（８）はスブルー部、（12）はゲート部、（12
a）はゲート、（14）はトーピード、（14a）はトーピー
ド先端部である。FIG. 1 is an enlarged sectional view of an essential part of an example of a hot runner type injection molding apparatus according to the present invention, and FIG. 2 is a partially cutaway front view of the example of the injection molding apparatus. In the figure, (4) is a mold, C is a cavity, (5) is a manifold, (8) is a blue part, (12) is a gate part, (12)
a) is a gate, (14) is a torpedo, and (14a) is a torpedo tip.
Claims (1)
内部加熱形トーピードを配して成るホットランナー式射
出成形装置において、 上記トーピードの上記ゲート部に臨むトーピード先端部
を30゜以下の先鋭角に形成して成り、 上記ゲート部におけるゲートの内周面と上記トーピード
先端部との間で形成される樹脂流動部はキャビティ側が
狭くなるように形成され、上記ゲートの内周面と上記ト
ーピード先端部との対向面の延長線で形成される角度を
15゜超、45゜以下の範囲にしたことを特徴とするホット
ランナー式射出成形装置。1. A hot runner type injection molding apparatus comprising an internally heated torpedo disposed continuously from a flow path of a molten resin to a gate portion, wherein a tip of the torpedo facing the gate portion of the torpedo is 30 ° or less. The resin flowing portion formed between the inner peripheral surface of the gate and the tip of the torpedo in the gate portion is formed so that the cavity side is narrowed, and the inner peripheral surface of the gate and the The angle formed by the extension of the surface facing the tip of the torpedo
A hot runner type injection molding device characterized by having a range of more than 15 mm and less than 45 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62130928A JP2638807B2 (en) | 1987-05-27 | 1987-05-27 | Hot runner type injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62130928A JP2638807B2 (en) | 1987-05-27 | 1987-05-27 | Hot runner type injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63295225A JPS63295225A (en) | 1988-12-01 |
| JP2638807B2 true JP2638807B2 (en) | 1997-08-06 |
Family
ID=15045998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62130928A Expired - Fee Related JP2638807B2 (en) | 1987-05-27 | 1987-05-27 | Hot runner type injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2638807B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50129659U (en) * | 1974-04-10 | 1975-10-24 | ||
| JPS5260848A (en) * | 1975-11-14 | 1977-05-19 | Sumitomo Bakelite Co | Mold for hot runner molding |
| JPS6018904Y2 (en) * | 1980-10-14 | 1985-06-07 | 堤 菁 | sharp heating element |
| JPH0617039B2 (en) * | 1985-07-18 | 1994-03-09 | ベルナルト・シユタウバ− | Transfer nozzle in high temperature passage tool |
-
1987
- 1987-05-27 JP JP62130928A patent/JP2638807B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 白石順一郎著「射出成形用金型」日刊工業新聞社（昭和５１年１２月１０日）第１３７頁〜第１４０頁 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63295225A (en) | 1988-12-01 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |