JP2010120303A - Sprue bush of mold for disk molding - Google Patents

Sprue bush of mold for disk molding Download PDF

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JP2010120303A
JP2010120303A JP2008297002A JP2008297002A JP2010120303A JP 2010120303 A JP2010120303 A JP 2010120303A JP 2008297002 A JP2008297002 A JP 2008297002A JP 2008297002 A JP2008297002 A JP 2008297002A JP 2010120303 A JP2010120303 A JP 2010120303A
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sprue
air
sprue bush
opening
mold
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JP4990260B2 (en
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Kaoru Yanagisawa
薫 柳沢
Akira Iijima
彰 飯島
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Nissei Plastic Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular air blowout opening on a sprue bush so as to limit by shortening a stringing phenomenon in extracting a sprue, which is apt to occur in high cycle molding of a disk. <P>SOLUTION: An air passage and the air blowout opening in an opening on the nozzle touch side of a sprue hole are formed by a boring and a fixed pin inserted into the boring. The annular blowout opening is formed by the pin end, the blowout opening enabling the blowout of air and being formed by the gap of the size into which a molten resin does not infiltrate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、スプルの糸引きを短く制限できるエアの吹出手段を備えたディスク成形用金型のスプルブッシュに関するものである。   The present invention relates to a sprue bush of a disk molding die provided with an air blowing means capable of restricting sprue stringing to a short length.

情報記録媒体として使用されるディスクの成形では、量産化の要望によりハイサイクル化が進んでおり、１成形サイクルを２秒以下で行いつつある。この２秒以下の成形サイクルでは、冷却時間１．０秒以下、計量時間０．７秒以下に設定する必要がある。このような時間設定による実成形では、金型内のディスクが設定時間内で冷却固化し、金型からの離型が可能であっても、ディスクと一体成形されたスプルブッシュ内のスプルは、ディスクよりも厚肉であることにより内部冷却が未完で熱く柔らかい状態にある。   In the formation of a disk used as an information recording medium, a high cycle is progressing due to a demand for mass production, and one molding cycle is being performed in 2 seconds or less. In the molding cycle of 2 seconds or less, it is necessary to set the cooling time to 1.0 seconds or less and the measurement time to 0.7 seconds or less. In actual molding by such time setting, even if the disk in the mold is cooled and solidified within the set time and can be released from the mold, the sprue in the sprue bush formed integrally with the disk is Since it is thicker than the disk, internal cooling is incomplete and it is in a hot and soft state.

このためディスクの離型を冷却時間をもって行うと、スプルでは射出ノズルの先端と接している端部を含む内部中央まで十分に冷却固化する間も無く型外に抜き出されることから、スプル後端により溶融樹脂がノズル先端から引き伸ばされて糸引となる。また射出ノズルでは前記冷却時間、計量時間の関係により計量後のノズル内部の溶融樹脂圧を降下させる目的のＳＤ値設定( 動作）は短く設定しなくてはならず、射出ノズルでのドルーリングが発生し易い状況にある。 さらに射出ノズルと金型のスプルブッシュ部の温度関係による糸引きも発生し易い状況となっている。   For this reason, if the disk is released with cooling time, the sprue is pulled out of the mold without being sufficiently cooled and solidified to the inside center including the end in contact with the tip of the injection nozzle. As a result, the molten resin is stretched from the tip of the nozzle and becomes string drawing. Also, in the injection nozzle, the SD value setting (operation) for the purpose of lowering the molten resin pressure inside the nozzle after metering must be set short due to the relationship between the cooling time and the metering time. The situation is likely to occur. Further, stringing is likely to occur due to the temperature relationship between the injection nozzle and the sprue bush portion of the mold.

成形サイクル時間が２秒以下のハイサイクル成形では、糸引きが長く生ずるようになり、これがディスクに付着すると外観不良となって生産の歩留りを悪くする。この糸引きを無くすには、ある温度以下に射出ノズルの温度設定やスプルブッシュの温度設定を低く設定すれば可能となるが、ディスクの成形では複屈折や転写性、シルバーストリークスやフローマークなどの発生によるディスク外観の問題から設定温度に制限を受けるので、温度設定により糸引き現象が解決されてもディスクの品質維持の点から採用し難いこととされている。   In high cycle molding in which the molding cycle time is 2 seconds or less, stringing occurs for a long time, and when it is attached to the disk, the appearance is poor and the production yield is deteriorated. To eliminate this stringing, it is possible to set the temperature of the injection nozzle and the temperature of the sprue bush below a certain temperature. However, birefringence, transferability, silver streaks, flow marks, etc. Since the set temperature is limited due to the problem of the appearance of the disk due to the occurrence of the occurrence of the disk, it is difficult to adopt from the viewpoint of maintaining the quality of the disk even if the stringing phenomenon is solved by the temperature setting.

温度設定以外の糸引き防止手段としては、溶融樹脂の射出充填後にスプルブッシュに設けたエアの吹出口より冷却エアを射出ノズルの先端に吹き付けて、ノズル内の溶融樹脂を冷却し、糸引き現象を防止することが知られている。またスプル孔を空気の通過は可能であるが、高粘度の溶融樹脂は孔には入れないような微細な多孔質の焼結金属で形成し、その焼結金属からスプル孔と樹脂の間に圧縮空気を放ってノズル部の樹脂を冷却することも知られている。さらに固定型内に冷却ガス供給路を穿設してスプル口端内に開口部を設け、その開口部を冷却ガス供給路に挿入したピンの抜き差し操作により開閉できるようにし、移動側金型の後退（型開）の過程で開口部からスプルに冷却ガスを送風して、離型時に生じた糸状の軟化した樹脂を冷却固化し、さらに移動側金型の後退による引張りにより糸状の冷却固化した樹脂を切断するものもある。
特開平１１−４８２８８号公報 実開平６−４９０１４号公報 特開２００２−１８７１８０号公報 As a means for preventing thread drawing other than temperature setting, cooling air is blown to the tip of the injection nozzle from the air outlet provided in the sprue bush after injection filling of the molten resin, and the molten resin in the nozzle is cooled, and the yarn drawing phenomenon It is known to prevent. Air can be passed through the sprue hole, but high-viscosity molten resin is formed of a fine porous sintered metal that cannot be put into the hole, and the spun hole is sandwiched between the sprue hole and the resin. It is also known to cool the nozzle resin by releasing compressed air. Furthermore, a cooling gas supply path is drilled in the fixed mold, an opening is provided in the end of the sprue port, and the opening can be opened and closed by inserting / removing a pin inserted into the cooling gas supply path. In the process of retreat (die opening), a cooling gas is blown from the opening to the sprue to cool and solidify the softened resin in the form of thread, which has been released from the mold, and further cooled and solidified by pulling the moving mold back. Some cut the resin.
Japanese Patent Laid-Open No. 11-48288 Japanese Utility Model Publication No. 6-49014 JP 2002-187180 A

冷却エアを射出ノズルの先端に吹き付けて、ノズル内の溶融樹脂を冷却固化する前記糸引き防止手段では、加熱されている射出ノズルを強制冷却することになるので、ノズル内の溶融樹脂が冷却固化するまで時間を要する。このため望まれる冷却時間が１．０秒以下とするディスクのハイサイクル成形には、冷却時間の点において採用し難い課題を有する。   The stringing prevention means for cooling and solidifying the molten resin in the nozzle by blowing cooling air to the tip of the injection nozzle forcibly cools the heated injection nozzle, so that the molten resin in the nozzle is cooled and solidified. It takes time to do. For this reason, the high cycle molding of a disk with a desired cooling time of 1.0 second or less has a problem that is difficult to adopt in terms of cooling time.

また焼結金属を通して圧縮空気の放出を行う前記糸引き防止手段では、適用可能な樹脂が高粘度の樹脂に限定されるので、ディスクの材料樹脂として使用されているメルトフローレートが高い低粘度のポリカーボネートには適合し難く、また多孔質であることにより吹出面に鍍金または磨き仕上げが施せないのでスプル孔の内面が粗面となり、溶融樹脂の流動に影響を与えたり、スプルの抜け出しが出来ないおそれがあるばかりか、ノズルタッチ力による圧縮変形により通気機能が損なわれ、短期間で使用に耐え得なくなることから採用し難い課題を有する。   Further, in the stringing prevention means that discharges compressed air through the sintered metal, the applicable resin is limited to a high-viscosity resin. Therefore, the melt flow rate used as a disk material resin is high, and the low-viscosity resin is used. It is difficult to conform to polycarbonate, and because it is porous, it cannot be plated or polished on the blow-out surface, so the inner surface of the sprue surface becomes rough, affecting the flow of the molten resin and preventing sprue from slipping out. In addition to the fear, the ventilation function is impaired due to compression deformation due to the nozzle touch force, and it is difficult to employ because it cannot withstand use in a short period of time.

またスプル孔の口端内に設けた冷却ガス供給路の開口部を、ピンの抜き操作により開放してスプルに冷却ガスを送風し、糸状に軟化した樹脂の冷却固化と切断を行う前記糸引き防止手段では、射出充填中の樹脂圧により開口部が開放されないようにピンを高圧保持する手段が必要となる。また成形ごとのピンの抜き差し操作の繰返しにより、ピン又は開口壁が摩耗してピン先端周囲のクリアランスに溶融樹脂が侵入し易くなり、侵入した樹脂の付着滞在によるピンの操作不具合や、ピンの差し操作により開口部から掻き出された樹脂によるコンタミの発生防止などから、頻繁なメンテナンスが必要となるのでディスクのハイサイクル成形には適さない課題を有する。   In addition, the above-described thread pulling is performed to cool and solidify and cut the resin softened in a thread shape by opening the opening of the cooling gas supply path provided in the mouth end of the sprue hole by blowing the pin and blowing the cooling gas to the sprue. The prevention means requires means for holding the pin at a high pressure so that the opening is not opened by the resin pressure during injection filling. Also, repeated pin insertion / removal operation for each molding causes the pin or opening wall to wear, making it easier for molten resin to enter the clearance around the tip of the pin. Frequent maintenance is required to prevent the occurrence of contamination due to the resin scraped from the opening by the operation, and therefore there is a problem that is not suitable for high cycle molding of the disc.

この発明は、前記従来技術の課題を解決するために考えられたものであって、その目的は、ディスクのハイサイクル成形に生じがちなスプル抜出し時の糸引きを、スプル孔内へのエアの吹出しにより短く制限するものであっても、樹脂圧による吹出口への溶融樹脂の侵入が防止でき、常に確実にスプル孔内へのエアの吹出しを行い得る穿孔とその内部の固定ピンとによる吹出口を備えた新たなディスク成形用金型のスプルブッシュを提供することにある。   The present invention has been conceived in order to solve the above-described problems of the prior art. The purpose of the present invention is to reduce the stringing at the time of sprue, which tends to occur in high cycle molding of a disk, and Even if it is limited by the blowout, the blowout port by the perforation that can prevent the molten resin from entering the blowout port due to the resin pressure and can always blow out the air into the sprue hole, and the fixing pin inside it. It is an object to provide a sprue bush of a new disk molding die provided with

前記目的によるこの発明は、スプルブッシュの後部に穿設してスプル孔のノズルタッチ側の開口内に設けたエアの吹出口と、スプルブッシュの後部に穿設して吹出口の穿孔に接続したエア注入口と、吹出口の穿孔に挿入してスプルブッシユに止着し、先端面をスプル孔壁面の吹出口と同一面に位置させた固定ピンとからなり、その固定ピンにより前記穿孔をピン周囲の間隙によるエア通路に形成するとともに、ピン先端により前記吹出口をエアの吹出しが可能で溶融樹脂が侵入しない寸法の間隙による環状の吹出口に形成してなる、というものである。   This invention according to the above object is formed by connecting an air outlet provided in the opening on the nozzle touch side of the sprue hole in the rear part of the sprue bush and connected to a perforation in the outlet part provided in the rear part of the sprue bush. It consists of an air inlet and a fixed pin that is inserted into the perforation of the air outlet and fixed to the sprue bush, and the tip surface is located on the same plane as the air outlet of the wall surface of the sprue hole. In addition to being formed in an air passage by a gap, the blower outlet is formed as an annular blower outlet with a dimension that allows air to be blown out by a pin tip and does not allow molten resin to enter.

また前記吹出口はスプル孔内面と、固定ピン先端面が同一の面粗さで仕上げられているというものであり、前記スプル孔内面と、固定ピン先端面の面粗さは表面粗さＲa １．６μｍ以下である、というものである。 The spout hole has an inner surface of the sprue hole and a fixed pin tip surface finished with the same surface roughness. The surface roughness of the inner surface of the sprue hole and the fixed pin tip surface is a surface roughness Ra. That is 1.6 μm or less.

前記構成では、スプル孔の開口内のエアの吹出口を、穿孔と該穿孔に挿入した固定ピンとにより環状の隙間により形成したので、固定ピンの外径寸法と穿孔による吹出口の内径寸法の差をもって、低粘度の樹脂に対応した環状の吹出口を形成することができ、低粘度の樹脂の侵入を阻止する間隙の吹出口の形成も容易なので、ディスク成形用金型のスプルブッシュに採用して糸引きの影響を受けないハイサイクル成形を実施することができる。   In the above configuration, since the air outlet in the opening of the sprue hole is formed by the annular gap between the perforation and the fixing pin inserted into the perforation, the difference between the outer diameter of the fixing pin and the inner diameter of the outlet due to the perforation It is possible to form an annular air outlet corresponding to low-viscosity resin, and it is easy to form a gap air outlet that prevents the intrusion of low-viscosity resin. High cycle molding that is not affected by thread drawing can be performed.

また吹出口の間隙寸法を固定ピンが維持するので、長時間の成形においても隙間の偏りが生じ難く、溶融樹脂の樹脂圧による間隙への侵入により、設定時間内でのエアの吹出量が不足して糸引きが長く生ずることもなく、常に安定したエアの吹出しが設定時間内で行えるのでスプルブッシュのメンテナンス期間も長くなり、ハイサイクル成形によるディスクの生産性も向上するようになる。   In addition, since the fixed pin maintains the gap size of the outlet, gap deviation is less likely to occur even during long-term molding, and the amount of air blown out within the set time due to the penetration of the molten resin into the gap due to the resin pressure As a result, stringing does not occur for a long time, and stable air blowing can always be performed within the set time, so that the maintenance period of the sprue bush becomes longer and the productivity of the disk by high cycle molding is improved.

図中１は固定型、２は可動型で、両金型の型閉により情報記録媒体のディスクを成形する円形のキャビティ３がパーティング面に形成されている。このキャビティ３は両金型の対向面に埋設した鏡面盤４，５と、固定型１の鏡面盤中央に嵌装したスプルブッシュ６の周囲の内側スタンパ押え７及び外側スタンパ押え８と、鏡面盤４による固定型側のキャビティ型面の情報信号溝・ピットが刻まれたスタンパ９とからなる。   In the figure, reference numeral 1 denotes a fixed die, 2 denotes a movable die, and a circular cavity 3 for forming a disc of an information recording medium is formed on a parting surface by closing both dies. The cavity 3 includes mirror plates 4 and 5 embedded in opposing surfaces of both molds, an inner stamper presser 7 and an outer stamper presser 8 around the sprue bush 6 fitted in the center of the mirror plate of the fixed die 1, and a mirror plate. 4 and a stamper 9 in which information signal grooves and pits are formed on the cavity mold surface on the fixed mold side.

前記スプルブッシュ６は、スプル孔６０を穿設したブッシュとブッシュ後部に一体形成した円形のセットブロック６１からなり、そのセットブロック６１の面内に凹設したノズル１０のタッチ面にスプル孔６０の流入側が開口している。   The sprue bush 6 includes a bush formed with a sprue hole 60 and a circular set block 61 integrally formed on the rear part of the bush. The sprue hole 60 is formed on the touch surface of the nozzle 10 recessed in the surface of the set block 61. The inflow side is open.

このスプル孔６０のノズルタッチ側の開口内には、ブロック外縁からスプル孔６０に向けて穿設した穿孔６２′の先端開口によるエアの吹出口６２が設けてある。この穿孔６２′の先端開口は小径（例えば１ｍｍ）に縮径されており、孔側部にはブロック後面から穿設したエア注入口６３が接続してある。このエア注入口６３には図示しないエア回路が接続してあり、エア回路には流量弁と減圧弁及び吹出用の電磁弁とが設けてある。   Inside the opening on the nozzle touch side of the sprue hole 60, an air outlet 62 is provided by a tip opening of a perforation 62 'drilled from the outer edge of the block toward the sprue hole 60. The front end opening of the perforation 62 'is reduced in diameter to a small diameter (for example, 1 mm), and an air injection port 63 drilled from the rear surface of the block is connected to the side of the hole. An air circuit (not shown) is connected to the air inlet 63, and the air circuit is provided with a flow rate valve, a pressure reducing valve, and a blowing electromagnetic valve.

前記穿孔６２′の後端開口はねじ孔に形成されており、そのねじ孔から穿孔６２′に固定ピン６４がスプル孔６０の壁面に先端が達するところまで挿入して、後端のねじ栓６４′によりセットブロック６１に止着してある。   The rear end opening of the perforation 62 ′ is formed in a screw hole, and the fixing pin 64 is inserted into the perforation 62 ′ from the screw hole until the tip reaches the wall surface of the sprue hole 60. It is fixed to the set block 61 by '.

この固定ピン６４は穿孔６２′の先端開口の口径よりも小径で、先端面がスプル孔６０の内面と同形にＲa １．６μｍ以下の同一面粗さで仕上げられて、吹出口６２と同一面に位置している。また固定ピン６４の挿入により穿孔６２′はねじ栓６４′により閉塞された後端から先端までピン周囲の間隙によるエア通路６５に形成され、前記吹出口６２を環状の吹出口６２に形成している。この吹出口６２の環状の間隙の寸法は固定ピン６４が維持するので変わることがなく、スプルブッシュにかかわるメンテナンス期間も長くなる。 The fixing pin 64 is small in than the diameter of the distal opening of the borehole 62 ', the tip surface is finished with R a 1.6 [mu] m or less in the same plane roughness on the inner surface the same shape of the sprue hole 60, identical to the outlet 62 Located on the surface. Further, by inserting the fixing pin 64, the perforation 62 ′ is formed in the air passage 65 by the gap around the pin from the rear end to the front end closed by the screw plug 64 ′, and the air outlet 62 is formed into an annular air outlet 62. Yes. The size of the annular gap of the air outlet 62 is not changed because the fixing pin 64 is maintained, and the maintenance period related to the sprue bush is also prolonged.

前記環状の吹出口６２は、エアの吹出しが可能であるが溶融樹脂は侵入しない寸法の間隙に設定してあり、その寸法は固定ピン６４の外径寸法と吹出口６２の内径寸法の差をもって設定することができる。ディスクの材料樹脂としては低粘度のポリカーボネート（メルトフローレート：４８〜７２ｇ／１０ｍｉｎ，試験方法：ＪＩＳ Ｋ ７２１０））が使用されるが、メルトフローレート：６３ｇ／１０ｍｉｎの低粘度のポリカーボネートの場合では、間隙が０．００８ｍｍ以下であれば溶融材料の侵入を阻止でき、またエア注入口６３から圧送供給されたエアの吹出しをスムーズに行うことができる。したがって、長時間の成形においても溶融樹脂が樹脂圧により吹出口６２の間隙に侵入して、吹出し時間内でのエアの吹出量が低減するようなことがなく、常に設定量のエアの吹出しを設定時間内にて行える。   The annular air outlet 62 is set to have a gap that allows air to be blown out but does not allow molten resin to enter. The dimension of the annular air outlet 62 has a difference between the outer diameter of the fixing pin 64 and the inner diameter of the air outlet 62. Can be set. As the disk material resin, low-viscosity polycarbonate (melt flow rate: 48 to 72 g / 10 min, test method: JIS K 7210)) is used, but in the case of low-viscosity polycarbonate with melt flow rate: 63 g / 10 min. If the gap is 0.008 mm or less, the intrusion of the molten material can be prevented, and the air supplied from the air injection port 63 can be smoothly blown out. Therefore, even when molding for a long time, the molten resin does not enter the gap between the outlets 62 due to the resin pressure, and the amount of air blown out within the blowout time is not reduced, and the set amount of air is always blown out. It can be done within the set time.

前記スプルブッシュ６における糸引きの抑制は、ノズル１０から溶融樹脂１１をスプル孔６０を経て前記キャビティ３に射出充填し、冷却によりディスク（図は省略）を成形したのち、型開によりディスクを金型から離型する工程でエアを吹出すことにより行い得る。エアの吹出しはエア流量とタイマーによる型開の開始前からのタイミング及びエア吹出し時間の制御により行い得る。   Suppression of stringing in the sprue bush 6 is achieved by injecting and filling molten resin 11 from the nozzle 10 into the cavity 3 through the sprue hole 60, forming a disk (not shown) by cooling, and then opening the disk by mold opening. It can be performed by blowing air in the step of releasing from the mold. The air can be blown by controlling the air flow rate, the timing from the start of mold opening and the air blowing time by a timer.

型開によりスプル１２がスプル孔６０から抜け出す過程でエアの吹出しを行うと、抜け出しによりスプル１２の後端がノズル先端面から離れるとともにスプル周囲に隙間が生じ、その隙間からエアがスプル後端とノズル先端との間に生じた空間に圧入されて、スプル後端部の冷却固化を促進するとともに、図４に示すように、ノズル先端と共にノズルランド部の溶融樹脂の表面が冷却されてスキン層１１ａを形成する。このスキン層１１ａは長くとも０．７秒程のエア吹き時間で生ずる。   When air is blown out in the process of the sprue 12 coming out of the sprue hole 60 due to the mold opening, the rear end of the spru 12 is separated from the nozzle front end surface due to the escape and a gap is generated around the sprue. It is press-fitted into the space formed between the nozzle tip and promotes cooling and solidification of the rear end of the sprue, and as shown in FIG. 4, the surface of the molten resin in the nozzle land together with the nozzle tip is cooled and the skin layer 11a is formed. The skin layer 11a is generated with an air blowing time of about 0.7 seconds at the longest.

スプル１２の糸引きは、ノズルランド部の溶融樹脂と冷却固化しきれていないスプル後端との繋がりによるもので、抜け出てゆくスプル１２により溶融樹脂がノズル１０から引き出されて生ずるものであるから、スキン層１１ａの形成によりノズル口の樹脂表面が覆われるのにしたがって溶融樹脂がノズル口から引き出され難くなり、糸引きはノズル口がスキン層１１ａに塞がれるまでの間に抑制されるようになる。この結果、糸引きが生じてもそれはディスクに影響を与えることのない短い長さで済む。   The thread pulling of the spru 12 is caused by the connection between the molten resin in the nozzle land portion and the rear end of the sprue that has not been cooled and solidified. As the resin surface of the nozzle opening is covered by the formation of the skin layer 11a, the molten resin becomes difficult to be pulled out from the nozzle opening, and the stringing is suppressed until the nozzle opening is blocked by the skin layer 11a. become. As a result, even if stringing occurs, it may be a short length that does not affect the disk.

実際に、前記ポリカーボネート（メルトフローレート：６３ｇ／１０ｍｉｎ）による糸引きについての比較では、エア冷却を行わない場合の長さ約１１ｃｍ、これに対してエア吹出時間０．５秒のエア冷却では、長さ約１ｃｍと糸引きが極端に短くなっており、エア吹出しによる糸引き長さの抑制効果が一段と向上している。   Actually, in the comparison of the yarn drawing by the polycarbonate (melt flow rate: 63 g / 10 min), the length is about 11 cm when the air cooling is not performed, whereas in the air cooling with the air blowing time of 0.5 seconds, The length of about 1 cm and the thread drawing are extremely shortened, and the effect of suppressing the yarn drawing length by air blowing is further improved.

この発明に係わるスプルブッシュを備えたディスク成形用金型の断面図である。It is sectional drawing of the metal mold | die for disk formation provided with the sprue bush concerning this invention. 溶融樹脂の射出充填完了時の要部縦断面図である。It is a principal part longitudinal cross-sectional view at the time of completion of injection filling of molten resin. スプル抜出時の要部縦断面図である。It is a principal part longitudinal cross-sectional view at the time of sprue extraction. 同上の部分拡大図である。It is a partial enlarged view same as the above.

符号の説明Explanation of symbols

１ 固定型
２ 可動型
３ キャビティ
６ スプルブッシュ
９ スタンパ
１０ ノズル
１１ 溶融樹脂
１２ スプル
６０ スプル孔
６１ セットブロック
６２ 吹出口
６２′ 穿孔
６３ エア注入口
６４ 固定ピン
６５ エア通路 DESCRIPTION OF SYMBOLS 1 Fixed type 2 Movable type 3 Cavity 6 Sprue bush 9 Stamper 10 Nozzle 11 Molten resin 12 Spru 60 Sprue hole 61 Set block 62 Outlet 62 'Perforation 63 Air inlet 64 Fixed pin 65 Air passage

Claims (3)

スプルブッシュの後部に穿設してスプル孔のノズルタッチ側の開口内に設けたエアの吹出口と、
スプルブッシュの後部に穿設して吹出口の穿孔に接続したエア注入口と、
吹出口の穿孔に挿入してスプルブッシユに止着し、先端面をスプル孔壁面の吹出口と同一面に位置させた固定ピンとからなり、
その固定ピンにより前記穿孔をピン周囲の間隙によるエア通路に形成するとともに、ピン先端により前記吹出口をエアの吹出しが可能で溶融樹脂が侵入しない寸法の間隙による環状の吹出口に形成してなることを特徴とするディスク成形用金型のスプルブッシュ。 An air outlet provided in an opening on the nozzle touch side of the sprue hole formed in the rear part of the sprue bush;
An air inlet that is drilled in the rear of the sprue bush and connected to the bore of the outlet;
It consists of a fixed pin that is inserted into the perforation of the air outlet and fastened to the sprue bush, and the tip surface is located on the same plane as the air outlet of the wall surface of the sprue hole.
The fixing pin forms the perforation in an air passage by a gap around the pin, and the tip of the pin forms an annular air outlet with a gap of a size that allows air to be blown out and does not allow molten resin to enter. A sprue bush of a disk molding die characterized by the above. 前記吹出口はスプル孔内面と、固定ピン先端面が同一の面粗さで仕上げられていることを特徴とする請求項１記載の金型のスプルブッシュ。   2. The mold sprue bush according to claim 1, wherein the inner surface of the spout hole and the front end surface of the fixing pin are finished with the same surface roughness. 前記スプル孔内面と固定ピン先端面の面粗さは表面粗さＲa １．６μｍ以下であることを特徴とする請求項２記載の金型のスプルブッシュ。 The sprue hole inner surface and the mold sprue bush of claim 2, wherein the surface roughness of the fixing pin tip surface is less surface roughness R a 1.6 [mu] m.
JP2008297002A 2008-11-20 2008-11-20 Sprue bushing of disc mold Expired - Fee Related JP4990260B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012133712A1 (en) * 2011-03-31 2012-10-04 コニカミノルタアドバンストレイヤー株式会社 Molding die and method for producing optical element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0772312A (en) * 1993-09-06 1995-03-17 Fuji Photo Film Co Ltd Apparatus and method for producing fresnel lens
JP2002187180A (en) * 2000-12-19 2002-07-02 Canon Inc Injection molding method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0772312A (en) * 1993-09-06 1995-03-17 Fuji Photo Film Co Ltd Apparatus and method for producing fresnel lens
JP2002187180A (en) * 2000-12-19 2002-07-02 Canon Inc Injection molding method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012133712A1 (en) * 2011-03-31 2012-10-04 コニカミノルタアドバンストレイヤー株式会社 Molding die and method for producing optical element

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