JPS5910297B2 - Injection molding method of ultra-hard resin in plaster mold - Google Patents

Injection molding method of ultra-hard resin in plaster mold

Info

Publication number
JPS5910297B2
JPS5910297B2 JP54079945A JP7994579A JPS5910297B2 JP S5910297 B2 JPS5910297 B2 JP S5910297B2 JP 54079945 A JP54079945 A JP 54079945A JP 7994579 A JP7994579 A JP 7994579A JP S5910297 B2 JPS5910297 B2 JP S5910297B2
Authority
JP
Japan
Prior art keywords
resin
injection
mold
internal pressure
air vent
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
Application number
JP54079945A
Other languages
Japanese (ja)
Other versions
JPS5549237A (en
Inventor
山人 木暮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP54079945A priority Critical patent/JPS5910297B2/en
Priority to NL7909117A priority patent/NL7909117A/en
Priority to GB7943928A priority patent/GB2051654B/en
Priority to CA000343102A priority patent/CA1149566A/en
Priority to DE19808000989U priority patent/DE8000989U1/en
Priority to DE3001366A priority patent/DE3001366C2/en
Priority to IT47752/80A priority patent/IT1128089B/en
Publication of JPS5549237A publication Critical patent/JPS5549237A/en
Priority to FR8010405A priority patent/FR2459719A1/en
Priority to US06/323,305 priority patent/US4359435A/en
Publication of JPS5910297B2 publication Critical patent/JPS5910297B2/en
Expired legal-status Critical Current

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
    • B29C45/76—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • 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
    • B29C45/34—Moulds having venting means
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (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】 この発明は樹脂成型法及びその装置に関する。[Detailed description of the invention] The present invention relates to a resin molding method and an apparatus therefor.

本発明者は先き特許第８２８２１ １号（特公昭５０−
１６５９７号公報参照）においてフラスコ内にワックス
模型を入れこれを石膏で埋没した後ワックス模型を加熱
容解、除去して形成される石膏型内に樹脂を射出圧入し
て歯科補綴物を製作する方法の発明を提供した。The present inventor has previously disclosed patent No. 828211 (Japanese Patent Publication No. 82821-1)
16597), a method of manufacturing a dental prosthesis by placing a wax model in a flask, embedding the wax model in plaster, and then injecting and press-fitting a resin into the plaster mold formed by melting and removing the wax model by heating. invention.

しかし、その後この方法発明の心臓部ともいうべき樹脂
を射出圧人する工程において射出速度と型内圧（一次圧
）と保持圧（二次圧）とスプルーランナーゲートの径と
長さとエアベントの直径と長さとの微妙な相関関係が樹
脂の安定した物性と寸法精度を具備した樹脂製品を製作
する上で極めて重要な要素を占めるものであシこの相関
関係の解明とそれに応じた技術手段を完成させることな
くして精密な樹脂成型が不可能であることが明らかとな
った。However, in the process of injecting the resin, which is the heart of the invention, the injection speed, mold internal pressure (primary pressure), holding pressure (secondary pressure), diameter and length of the sprue runner gate, and diameter of the air vent were determined. The delicate correlation with length is an extremely important element in producing resin products with stable physical properties and dimensional accuracy.We will elucidate this correlation and perfect the corresponding technical means. It has become clear that precise resin molding is impossible without this.

この技術的課題についてさらに詳述すれば、射出孔より
樹脂が型内に急速に圧人されると型内に滞留した空気が
圧縮きれ型内圧は一時的に高くなり型内の抵抗が大きく
なる。To explain this technical problem in more detail, when the resin is rapidly pressed into the mold through the injection hole, the air remaining in the mold is compressed, causing the internal pressure of the mold to temporarily increase and the resistance inside the mold to increase. .

この型内圧力の一時的且つ急激な抵抗の発生は零コンマ
以下の秒単位の超スピードで射出充填せんとする樹脂の
速度を落とし樹脂の冷却作用を誘発することになる。This temporary and sudden generation of resistance in the mold pressure reduces the speed of the resin being injected and filled at an ultra-high speed of less than a fraction of a second, inducing a cooling effect on the resin.

しかし、射出成型においては樹脂の冷却作用を起す時間
と樹脂の流れる距離及び厚さが反比例するから完全に樹
脂が冷却硬化作用を起す以前に充填作業を完了してしま
わねばならない。However, in injection molding, the time required for the resin to cool down is inversely proportional to the distance and thickness of the resin, so the filling operation must be completed before the resin completely cools and hardens.

これを無視して無理な圧力を型内にかけ全体に強引に充
填すれば必然的に型内に残留する圧力が大きくなシ樹脂
の物性精密度と案定性が低下することになりかつ肉厚と
肉薄の成形品では成形が不可能である。If you ignore this and forcefully fill the entire mold by applying excessive pressure, a large amount of pressure will inevitably remain in the mold, resulting in a decrease in the precision and designability of the physical properties of the resin, and a decrease in wall thickness. It is impossible to mold thin molded products.

この技術的課題を射出速度と射出圧とエアベントの直径
との相関関係をいかにはかるかがこの発明の第１の目的
である。The first object of the present invention is to solve this technical problem by measuring the correlation between injection speed, injection pressure, and air vent diameter.

次に、射出成型時に発生する型内圧力の急上昇をエアベ
ントによシ避けるとしてもその次の瞬間そのエアーベン
トが樹脂が硬化することによって封鎖された後射出充填
完了した樹脂成型品が硬化して収縮が開始するがこれを
如何に防ぐかがこの発明の第２の目的でありここにおい
てエアベントとスプルーランナーと型の保持圧との相関
性が解明されなければならないのである。Next, even if you use an air vent to prevent the sudden rise in pressure inside the mold that occurs during injection molding, the next moment the air vent is blocked by the resin curing, and the resin molded product that has been injected and filled will harden. The second purpose of this invention is how to prevent shrinkage from starting, and here the correlation between the air vent, the sprue runner, and the holding pressure of the mold must be clarified.

さらに、成型品が肉厚のもの一場合射出充填直後必ず樹
脂は型内に冷却され収縮作用が発生するから直ちに保持
圧をかけていかなければ寸法精度を確保できない。Furthermore, if the molded product is thick, the resin will necessarily cool down in the mold immediately after injection and filling, and shrinkage will occur, so dimensional accuracy cannot be ensured unless holding pressure is applied immediately.

これを如何にコントロールするか。How do we control this?

また、収縮して内圧が降下する分離脂を補充するとして
も成型品が完全に安定した状態にならない以前にスプル
ーランナーが完全硬化した場合樹脂補充することができ
なくなるがこれを防ぐにはどうすればよいか、これを肉
厚の程度とスプルーランナーの径と長さとの相関性の解
明によシ解決せんとするのがこの発明の第３の目的であ
る。Also, even if you replenish the separated resin, which shrinks and lowers the internal pressure, if the sprue runner is completely cured before the molded product becomes completely stable, you will not be able to replenish the resin. What can I do to prevent this? The third object of the present invention is to solve this problem by elucidating the correlation between the degree of wall thickness and the diameter and length of the sprue runner.

この発明の第４の目的は、射出成型品が肉厚部分と肉薄
部分一体に具備する場合、いかに物性の精度と安定性を
与えることができるかである。A fourth object of the present invention is how accurate and stable physical properties can be imparted when an injection molded product is provided integrally with a thick part and a thin part.

この場合、単に成型時の収縮のみを考慮しても解決され
ず、したがって射出成型に当って樹脂が硬化するまでの
間に完全に型内に充填されねばならない。In this case, simply considering shrinkage during molding will not solve the problem; therefore, the resin must be completely filled into the mold before it hardens during injection molding.

そのためには射出速度を速めて極めて短時間に瞬時に射
出充填しなければならないが肉厚部分の空気が圧縮され
肉薄部分に滞留すれば肉薄部分は空気圧の抵抗は大とな
シ射出充填時の樹脂の流動が遅延するため冷却し、射出
充填効果を低下させショートにな９又成形できても樹脂
本来の物性と精度を発揮できない。To achieve this, the injection speed must be increased to instantaneously inject and fill in an extremely short period of time, but if the air in the thick wall is compressed and stagnates in the thin wall, the air pressure resistance in the thin wall will be large during injection and filling. Since the flow of the resin is delayed, cooling reduces the injection filling effect, resulting in a short 9-prong molding, but the original physical properties and precision of the resin cannot be exhibited.

また、いたずらに射出圧を高め射出スピードを速めても
質は安定せず、また石膏型は破壊する。Moreover, even if the injection pressure is increased and the injection speed is increased unnecessarily, the quality will not be stable and the plaster mold will be destroyed.

この場合の技術的課題は型内空気の脱気と物性確保のた
めの収縮分の樹脂を補充安定させるための寸法と精度を
エアベントの封鎖が可能な樹脂の硬化が出来るエアベン
トとスプルーランナーの径及び長さの相関性が考慮され
ねばならない。The technical issues in this case are the dimensions and precision of degassing the air in the mold, replenishing the resin for shrinkage to ensure physical properties, and the diameter of the air vent and sprue runner, which can seal the air vent and allow the resin to harden. and length correlations must be considered.

この発明の第５の目的は、樹脂の射出充填が全て完了す
ると共にスグルーランナーが硬化する時間が来ても充填
された成形品の肉厚部分が厚すぎるためなおも冷却、収
縮を続けていたのでは肉厚部分の物性と精密度を保持で
きないので型内の肉厚部分の周囲に冷却パイプを埋設し
てその効果をあげると共に逆に保温を必要とする部分に
は保温パイプをその周辺に埋設して保温効果を上げ射出
成形全体の物性と精度の確保を図ることである。The fifth object of this invention is that even after the injection filling of the resin is completed and the time has come for the suglu runner to harden, the thick part of the filled molded product is too thick and continues to cool and shrink. However, since it is not possible to maintain the physical properties and precision of the thick part of the mold, cooling pipes are buried around the thick part of the mold to increase the effect, and conversely, insulating pipes are installed around the thick part of the mold in areas that require heat retention. This is to improve the heat retention effect and ensure the physical properties and precision of the injection molding as a whole.

次にこの発明の構成を例示図面によシ説明する。Next, the configuration of the present invention will be explained with reference to illustrative drawings.

第１図は成形しようとする樹脂製品ａ自体の肉厚部分が
略均一な場合の断面図を示す。FIG. 1 shows a cross-sectional view when the thickness of the resin product a to be molded is substantially uniform.

ワックス原型は常法通シ下部フラスコ２と上部フラスコ
３の中に収納されると共に上下部フラスコ２，３の接合
面の対向方向にワックスで形成されたスプルーランナー
４とエアーベント５が接続している。The wax model is housed in a lower flask 2 and an upper flask 3 in a conventional manner, and a sprue runner 4 formed of wax and an air vent 5 are connected in opposite directions of the joining surfaces of the upper and lower flasks 2 and 3. There is.

石膏６を密封されたフラスコ内に注入し、その硬化をま
ってワックスを加熱除去して石膏型７を形成する。Plaster 6 is poured into a sealed flask, allowed to harden, and wax is removed by heating to form a gypsum mold 7.

スプルーランナー４の射出孔８には内圧検知匍脚装置（
図面略）の内圧検知用センサーピン９を臨ませておく。The injection hole 8 of the sprue runner 4 is equipped with an internal pressure sensing leg device (
The sensor pin 9 for detecting internal pressure (illustration omitted) is left facing.

そして超高速射出能力（最大射出速度０．１秒）の射出
成形機（図面略）の射出ノズルを射出孔８にあて超硬樹
脂を石膏型７内へ射出速度０．Ｏｌ〜１０秒、射出圧３
０〜１ ２ ０ ０ ｋｇ／ｃＩＩＬ２ の条件下で急
速に射出圧入する。Then, the injection nozzle of an injection molding machine (not shown) with ultra-high-speed injection capability (maximum injection speed of 0.1 seconds) is applied to the injection hole 8, and the superhard resin is injected into the plaster mold 7 at a speed of 0.1 seconds. Ol ~ 10 seconds, injection pressure 3
Injection is carried out rapidly under conditions of 0 to 1200 kg/cIIL2.

この際石膏型７内に滞留した空気が圧縮され内圧が一時
的に高くなり型内の抵抗が大きくなるのでエアーベント
５よシその型内圧力をスムースに脱気することによυ型
内圧力の急上昇を抑止すると共に完全に型内圧力を排除
できたならば速やかにエアーベント５を密封する。At this time, the air accumulated in the plaster mold 7 is compressed and the internal pressure temporarily increases, increasing the resistance within the mold. Once the pressure inside the mold has been completely eliminated, the air vent 5 is immediately sealed.

この場合スプルーランナー４の直径又は周囲径は０．５
〜２０φ朋に対しエアーベント５の直径又は同じ周囲径
は０．１〜５ψ朋の範囲内で成型品の肉厚等の諸条件を
勘案し最適な相関関係を示す数１直をコンピューターに
予め記憶させておき、その条件下に設定する必要がある
。In this case, the diameter or circumference of the sprue runner 4 is 0.5
~20φ, the diameter of the air vent 5 or the same circumferential diameter is within the range of 0.1 to 5φ, taking into account various conditions such as the wall thickness of the molded product, and pre-calculating the equation 1 that shows the optimal correlation on the computer. It is necessary to memorize it and set it under that condition.

また、エアーベント５による脱気がなされ型内圧力の急
上昇が避けられてもその次の瞬間そのエアーベン１・５
が樹脂の硬化する事によって封鎖され射出充填物本体が
充填完了され硬化による収縮が始まるのでそれと同時に
収縮分の樹脂を保持圧（保持圧時間０．０５〜６０秒）
を掛けることによって補なっていく必要がある。In addition, even if the air vent 5 is degassed and a sudden rise in the pressure inside the mold is avoided, the air vents 1 and 5
is sealed by the hardening of the resin, the injection filling body is filled, and shrinkage due to hardening begins. At the same time, the shrinkage of the resin is applied to the holding pressure (holding pressure time: 0.05 to 60 seconds).
It is necessary to compensate by multiplying.

この際、先きに型内圧力を排除できたエアーベント５は
完全に密封できなければならない。At this time, the air vent 5, which was able to eliminate the pressure inside the mold earlier, must be able to be completely sealed.

第１図の場合は成形品自体の肉厚が均一な場合であるの
で難しい成型物体ではないが肉厚の物は高温で加熱した
樹脂であるほど射出後必ずその物体内に充填され冷却さ
れる時収縮が起することは必然的である。In the case of Figure 1, the thickness of the molded product itself is uniform, so it is not a difficult object to mold, but the thicker the object, the more the resin is heated to a high temperature, the more it will be filled into the object and cooled after injection. It is inevitable that time contraction will occur.

その場合スプルーランナー４に内圧検知匍脚装置のセン
サーピン９を装備せしめ石膏型の破壊圧を予めコンピュ
ーターに記憶せしめ収縮して内圧が降下する分、補充の
ための樹脂を送り込む作業をせしめることによって収縮
をさけることができる。In that case, the sprue runner 4 is equipped with the sensor pin 9 of the internal pressure sensing crawler device, the bursting pressure of the plaster mold is stored in advance in the computer, and the resin is fed for replenishment to compensate for the drop in internal pressure due to contraction. Shrinkage can be avoided.

尚、射出圧入した樹脂が完全且つ安定した成形状態とな
らない以前にスプルーランナー４が完全硬化した場合に
は型内圧検知制御装置のセンサーピン９の調整能力を失
うことになシその作用を果すことができないので成型品
の肉厚の程度に対するスプルーランナー４の最適な径と
長さの相関関係を示す数１直を予め制Ｍ置に記憶させて
おけば必要に応じいつでも最高の条件を指令させ、その
指令が完全に機能することによシスプルーランナー４の
硬化を防ぐことができる。Note that if the sprue runner 4 is completely cured before the injected resin is completely and stably molded, the adjustment ability of the sensor pin 9 of the mold internal pressure detection control device will be lost. Since it is not possible to do this, it is possible to memorize the formula 1, which indicates the optimum relationship between the diameter and length of the sprue runner 4 for the wall thickness of the molded product, in advance in the controller, so that the best conditions can be commanded whenever necessary. , by fully functioning the command, it is possible to prevent the sysprue runner 4 from curing.

第２図は射出成形品の肉厚が不均二で肉厚部Ａと肉薄部
Ｂからなりこれと同時成型する場合の実施例を示す。FIG. 2 shows an embodiment in which the injection molded product has non-uniform wall thickness, consisting of a thick wall portion A and a thin wall portion B, which are simultaneously molded.

この場合には単に成形時の収縮のみを考えても不可能で
あってまず射出成形に当って樹脂が完全に充填されるま
で硬化させてはならないので第１図に示した単一物体と
異なり相当な射出速度が必要になってくる。In this case, it is impossible to simply consider shrinkage during molding, and the resin must not be cured until it is completely filled during injection molding, which is different from the single object shown in Figure 1. A considerable injection speed is required.

まず、肉厚部分Ａの空気が圧縮され肉薄部分Ｂに滞留す
ればその空気圧の抵抗は犬になり射出充填時の樹脂の流
動が遅延するため樹脂が冷却されることによってその射
出充填効果を低下させ樹脂本来の物性を発揮できない。First, if the air in the thick part A is compressed and stagnates in the thin part B, the resistance of the air pressure increases and the flow of the resin during injection filling is delayed, so the resin is cooled and the injection filling effect is reduced. The resin cannot exhibit its original physical properties.

いたずらに射出圧を高め射出速度を速めれば型内圧の抵
抗は関係なくなるが石膏型は破壊されるので成型は不可
能である。If the injection pressure is increased unnecessarily and the injection speed is increased, the resistance of the mold internal pressure becomes irrelevant, but the plaster mold will be destroyed and molding will not be possible.

それを防ぐため型内圧を上げることがない様にエアベン
ト５を必要としさらに前述の如くその効果を達成後射出
充填樹脂その物で封鎖できる直径と長さのエアベント５
が必要となってくる。In order to prevent this, an air vent 5 is required to prevent the pressure inside the mold from increasing, and the air vent 5 has a diameter and length that can be sealed with the injection filling resin itself after achieving this effect as described above.
becomes necessary.

これはその成形される物体の大きさによってスプルーラ
ンナー４とエアベント５の径は異なってくるが排圧と物
性確保のための収縮分の樹脂を補充安定させるための二
次圧の排出を防止できるため封鎖が可能な樹脂の硬化力
１１るスプルーランナー４とエアベント５の径の相関関
係が必要となる。Although the diameters of the sprue runner 4 and air vent 5 differ depending on the size of the object to be molded, it is possible to prevent the discharge of secondary pressure to replenish and stabilize the resin for shrinkage to ensure exhaust pressure and physical properties. Therefore, it is necessary to have a correlation between the diameters of the sprue runner 4 and the air vent 5, which depend on the curing power of the sealable resin.

これらの相関関係を示す数１直をあらかじめ制御装置に
コントロールできるよう又最高の射出成形のコンデショ
ンを指令してその指令が完全に機能することによシこの
ような肉厚と肉薄を合せもつ製品をも樹脂の物性と精密
度を発揮できることになる。In order to be able to control the number 1 that shows these correlations in advance in the control device, and to command the best injection molding conditions so that the commands function perfectly, it is possible to have both wall thickness and thinness. Products will also be able to demonstrate the physical properties and precision of resin.

工業製品に限らず歯科用補綴物でもその製造個数の少な
い物のための石膏型をフラスコで固定した物の内で射出
成型する場合特にその樹脂の特性と精密度を確保しよう
とする場合にはその型内圧力を常に検知し、調整できる
センサーピン９をスプルーランナー４に直結して装備せ
しめ内圧を検知し、調整すれば石膏型を破壊することな
く超高速度で射出成型することによって第５図に示すよ
うに従来は肉厚部と肉薄部の差が太きければ二つの部分
として成型後組合せるような肉薄部Ｂの厚さが０． ５
ｍａｒの肉薄部Ｂと厚さ２０ｍｍの肉厚部のそれぞれ
からなる製品であっても第４図の如く同時一体成型が可
能となるのである。Not only for industrial products but also for dental prostheses, when injection molding is performed in a mold fixed in a flask for a small number of manufactured items, especially when trying to ensure the properties and precision of the resin. A sensor pin 9 that can constantly detect and adjust the internal pressure of the mold is directly connected to the sprue runner 4 and equipped with it. As shown in the figure, conventionally, if the difference between the thick part and the thin part is large, the thickness of the thin part B is 0. 5
Even a product consisting of a thin part B and a thick part of 20 mm can be simultaneously integrally molded as shown in FIG. 4.

しかして、この発明の要旨は石膏型７により樹脂成型す
る方法において、保持圧時間０．０５〜６０秒の型内に
直径又は同じ周囲径０．５〜２０φ朋のスプルーランナ
ーから樹脂を射出速度０．０１〜１０秒で射出圧３０〜
１２００ｋｇ／ｃＩｆｉ２の射出条件で高速射出すると
共に０．１〜５φＩＬ１ＩＬの直径又は同じ周囲径のエ
アベント４によシ急上昇しようとする型内圧力を、脱気
しなから型７内に樹脂を充填せしめた後エアーベスト５
を冷却した樹脂によシ封鎖しておき成形物の収縮の分だ
け樹脂をさらに補充し、充填を完了した後スプルーラン
ナー４を冷却硬化させ全体の硬化をまって完成させ、こ
れら一連の動作をスプルーランナー４に直結した制御装
置のセンサーピン９により内圧検知、調整して行うと共
に精密度と物性を確保できるスプルーランナー４とエア
ベント５の相関関係を最高の条件下で石膏型内圧をコン
トロールしつ＼成型して前述したような効果を発揮させ
ることを特徴とするものである。Therefore, the gist of the present invention is a method of resin molding using a plaster mold 7, in which resin is injected from a sprue runner with a diameter or the same circumferential diameter of 0.5 to 20φ into a mold with a holding pressure time of 0.05 to 60 seconds at a speed of injection. Injection pressure 30~ in 0.01~10 seconds
During high-speed injection under the injection condition of 1200 kg/cIfi2, the mold 7 is filled with resin without degassing the pressure inside the mold which is about to rise rapidly due to the air vent 4 having a diameter of 0.1 to 5φIL1IL or the same circumference diameter. air best 5
The sprue runner 4 is sealed with cooled resin, and more resin is added to cover the shrinkage of the molded product. After filling is completed, the sprue runner 4 is cooled and hardened to complete the entire hardening process. The sensor pin 9 of the control device directly connected to the sprue runner 4 detects and adjusts the internal pressure, and the correlation between the sprue runner 4 and the air vent 5 ensures precision and physical properties while controlling the internal pressure of the plaster mold under the best conditions. It is characterized by being molded to produce the effects described above.

さらに、スプルーランナー４が硬化する時間が来ても充
填形成物体の肉厚部分が厚すぎて冷却収縮を続けている
様では肉厚部の物性と精密度を保持できないので第６図
に示すように冷却パイプ１０を肉厚部の周辺に予め埋設
してその効果をあげると共に保温を必要とする部分には
予め保温パイプ１１を埋設し、保温効果をあげ射出成形
全体の物性、精度を発揮させる。Furthermore, even after the time has come for the sprue runner 4 to harden, if the thick part of the filled and formed object is too thick and continues to shrink on cooling, the physical properties and precision of the thick part cannot be maintained, so as shown in FIG. A cooling pipe 10 is buried in advance around the thick wall part to increase its effect, and a heat insulation pipe 11 is buried in advance in the area where heat retention is required to increase the heat retention effect and bring out the physical properties and precision of the injection molding as a whole. .

同、石膏型製造時には石膏の混水比と攪拌作業を常法に
従って行ない且つ埋設にあたってはその可塑化反応前に
真空内で石膏を注入し同時に震動を与えて埋設製造する
ことが石膏型内面を緻密にでき成型品の精度を高める。Similarly, when manufacturing a gypsum mold, the water mixing ratio of gypsum and stirring work are carried out according to conventional methods, and when burying the gypsum mold, it is necessary to inject the gypsum in a vacuum before the plasticization reaction and at the same time apply vibrations to bury the mold. Improves precision of molded products.

第７図は、上述の如くの成型法を歯科補綴物（義歯類）
に応用した例を示す断面図であるが口腔内の異物排出作
用義歯の上頚の口蓋面１２に当る部分の肉厚が０． ５
ｍｍ以下でなければ口腔内の異物を口腔外へ追出そう
とする異物排出神経が常に働くという一種の異害作用を
除くためにも非常に肉薄でなければならないことになる
が従来の成型法で得られたものは肉薄の物を作った場合
義歯としての食物を噛む力に対応できず破折してしまう
ため肉薄のものは望めなかったが現在ではそれに対応で
きる樹脂が開発されてきたがそれらの樹脂は加熱温度が
２８０℃〜４００℃以上と高温化され射出充填時の流動
性も悪くなってきているのでそれを補うためにも射出速
度が０．１秒程度で射出充填を完了しなければ物性と精
密度を確保できない。Figure 7 shows how the above-mentioned molding method is applied to a dental prosthesis (denture).
This is a cross-sectional view showing an example in which the denture is applied to expel foreign matter from the oral cavity. 5
If the thickness is less than mm, it must be extremely thin in order to eliminate the harmful effect of the foreign body expulsion nerves constantly working to expel foreign substances from the oral cavity out of the oral cavity, but conventional molding methods However, resins that can cope with this problem have now been developed. The heating temperature of these resins is high, ranging from 280°C to 400°C or higher, and the fluidity during injection filling is becoming poor. To compensate for this, the injection speed is set to complete injection filling at about 0.1 seconds. Otherwise, physical properties and precision cannot be ensured.

また従来品は吸水性があシ物性に繞みがあシ精密度の乏
しいものである。In addition, conventional products have poor water absorption, poor physical properties, and poor precision.

従来の射出成型法では成型品の品質を向上と人体生理学
的見地からみて現在のポリカーボネート樹脂、ポリアリ
レート樹脂、ポリサル７オン樹脂等を石膏型内に射出成
形し、第７図に示すような生理学的に理想的な肉薄部分
（０．５ｍｍ以下）を持つ義歯を製造することは不可能
である。In the conventional injection molding method, in order to improve the quality of the molded product and from the viewpoint of human physiology, current polycarbonate resins, polyarylate resins, polysal 7-on resins, etc. are injection molded into plaster molds, and the physiological results shown in Figure 7 are used. Therefore, it is impossible to manufacture a denture with an ideal thin wall portion (0.5 mm or less).

これを理想的な歯科補綴物の射出成型にも応用可能とし
たのはまさに上述した如く本発明において型内圧感知制
御装置のセンサーピン９を備えたスグルーランナー４と
エアベント５の相関性の上に立って石膏型冷却、加熱装
置を配備し且つ超高速射出能力の射出成型機によっては
じめて石膏内に安定した物性と精密度を確保した射出成
型を可能としたこと等この産業上の効果は大きい。The reason why this can be applied to the injection molding of an ideal dental prosthesis is precisely because of the correlation between the air vent 5 and the sugrue runner 4 equipped with the sensor pin 9 of the mold internal pressure sensing control device in the present invention, as described above. The industrial effects of this technology are significant, such as the fact that it became possible for the first time to perform injection molding with stable physical properties and precision within the plaster using an injection molding machine equipped with standing plaster mold cooling and heating equipment and an ultra-high-speed injection capability. .

なお特許第１００３３１号明細書として、石澱粉および
食塩の混合物に水を加え混練捏和して得られる可塑性物
により石膏雌型を印像し、この石膏雌型に普通の石膏を
充填し凝固する石膏塑造用雄型の製造法が提案されてい
る。In addition, as described in Patent No. 100331, a female plaster mold is imprinted with a plastic material obtained by adding water to a mixture of stone starch and salt, kneading, and kneading, and this female plaster mold is filled with ordinary plaster and solidified. A method for manufacturing a male mold for plaster molding has been proposed.

しかしながら上記のものは市却凝固反応の安定している
石膏の充填を目的とし、しかも印像によシ形成される石
膏雌型のため、特性を失い易く状態も太いに変シ易い樹
脂製品の製作用としての使用に耐えないし、又引抜き可
能な形状の製品しか製作出来ず非常に用途が限定される
。However, the above-mentioned products are intended to be filled with gypsum, which has a stable commercial solidification reaction, and are molded into gypsum molds formed by impressions. It cannot be used for manufacturing purposes, and it can only be manufactured in a shape that can be pulled out, so its uses are extremely limited.

又印像によシ形成された石膏雌型は開口が大になるため
樹脂の冷却硬化反応にバラツキを来して製品にむらが生
じる上、表面状態が荒くなシバリも出来やすい。In addition, since the opening of the plaster female mold formed by the impression is large, the cooling and hardening reaction of the resin varies, resulting in unevenness of the product, and the surface is likely to be rough and wrinkled.

又石膏澱粉および食塩の混合物に水を加え混練捏和した
ものは容易に破砕することになシ樹脂の射出圧は非常に
小さなものに制限され樹脂は細部にまで流入できず表面
状態の悪いものとなる。Also, a mixture of gypsum starch and salt mixed with water and kneaded will easily fracture, and the injection pressure of the resin will be limited to a very low level, so the resin will not be able to flow into the fine details and the surface will be in poor condition. becomes.

又特開昭５２−１４６５８号公報のような金型のもので
は金型の製作が高価になるとともに樹脂成形後金型を二
分割して樹脂製品を引抜くため引抜き可能な形状の製品
以外は製作不可能である。In addition, with molds such as those disclosed in JP-A No. 52-14658, the production of the mold is expensive, and the mold is divided into two parts after resin molding to pull out the resin product, so products other than products with a shape that can be pulled out are difficult to manufacture. It is impossible to manufacture.

しかしながら本発明では耐圧フラスコ内にワックスのよ
うな融解排出できる材料からなる模型を固定し，耐圧フ
ラスコの側面に設けられた開口部と前記模型とを模型と
同部材でなるゲートによりＭＬ、その耐圧フラスコ内に
石膏を注入して模型とゲートを埋設し、石膏硬化後模型
とゲートを１融解排出して模型スペースの空洞を囲繞す
る石膏型を形成するから、このような模型スペースの空
洞を有する石膏雌型に樹脂を細いベント孔から射也注入
すると樹脂の冷却硬化反応は安定したものとなり樹脂が
空洞のすみずみにまで行きわたり表面状態も緻密になり
高精度になる。However, in the present invention, a model made of a material such as wax that can be melted and discharged is fixed in a pressure flask, and a gate made of the same material as the model connects the model to an opening provided on the side of the pressure flask. Plaster is injected into a flask and the model and gate are buried, and after the plaster hardens, the model and gate are melted and discharged to form a plaster mold that surrounds the cavity of the model space, so it has such a cavity of the model space. When resin is injected into the female plaster mold through a narrow vent hole, the cooling and hardening reaction of the resin becomes stable, the resin spreads to every corner of the cavity, and the surface becomes dense and highly accurate.

樹脂硬化後石膏を破砕して樹脂製品を得るものであるか
らどのような形状の製品又はオーダーによる義歯、義関
節、義肢等をも高品質で得られることになる。Since the resin product is obtained by crushing the plaster after the resin has hardened, high-quality products such as dentures, prosthetic joints, prosthetic limbs, etc., can be obtained in any shape or made to order.

さらに本発明では、軟化した合成樹脂を耐圧フラスコの
開口部から石膏のゲート孔を通して模型２ペース空洞内
に射出注入し、樹脂硬化後耐圧フフスコを分割し石膏を
破砕して樹脂製品を得るものであるから、石膏雌型はフ
ラスコに合致したものとなシ高い樹脂射出圧に十分耐え
るものとなる。Furthermore, in the present invention, the softened synthetic resin is injected from the opening of the pressure flask through the gate hole of the plaster into the model 2 space cavity, and after the resin hardens, the pressure flask is divided and the plaster is crushed to obtain the resin product. Because of this, the plaster female mold should match the flask and be sufficiently resistant to the high resin injection pressures.

このように高い圧力で細いゲート孔から模型スペースの
空洞を囲繞する石膏雌型内に樹脂を射出圧入するから樹
脂の射出条件は望ましいものとなシ、．細部にいたるま
で樹脂が行きわたシ表面状態の緻密な高精度の樹脂が得
られることになる。Since the resin is injected and press-fitted at high pressure into the female plaster mold surrounding the cavity of the model space through the narrow gate hole, the resin injection conditions are desirable. This results in a highly accurate resin with a fine surface condition in which the resin is spread over even the smallest details.

さらにいうならば、本発明の石膏型は射出速度１〜５秒
で２５０〜３００ｋｇ／ｃｒｒＬ２の圧力に、射出速度
０．１秒以下で７００〜９００ｋｇ／ｃｒｒＬ２の圧力
に十分耐え得るものであり、０．Ｏｌ秒の射出速度では
さらに高い圧力に耐え得る。Furthermore, the plaster mold of the present invention can sufficiently withstand a pressure of 250 to 300 kg/crrL2 at an injection speed of 1 to 5 seconds, and a pressure of 700 to 900 kg/crrL2 at an injection speed of 0.1 seconds or less, 0. Even higher pressures can be withstood at injection speeds of 1 second.

したがって、このように高速射出された樹脂は瞬時にし
て肉厚部と肉薄部とを同時にしかも細部にいたるまで注
入成形するから複雑な形状をもつ製品をも高品質で製作
できることになる。Therefore, since the resin injected at high speed is instantaneously injected into thick and thin parts simultaneously and down to the smallest detail, products with complex shapes can be manufactured with high quality.

しかもこのように高速射出で瞬時にして樹脂射出が完了
することは樹脂層が単層とｆｘシ表面状態が緻密で強度
的にも秀れたものになる。Moreover, the fact that the resin injection is completed instantaneously with such high-speed injection means that the resin layer is a single layer, has a dense surface condition, and has excellent strength.

又特開昭５３−６１１９４号公報の一回埋没法による義
歯製造法が提案されているが、それはハンドルを回転す
ることによって上下動するプランジャーと、前記プラン
ジャーの先端部の挿通な許容する餅状レジン収容シリン
ダ一部材とおらなっておりハンドルを回転させなからレ
ジンをゆつくシフラスコのプラスター型内に加圧注入し
、この加圧注入工程中にベントよシレジンが注出するの
を確認した後、通法に従ってレジンを加熱重合する。Furthermore, Japanese Patent Application Laid-Open No. 53-61194 proposes a method for manufacturing dentures using a single-implantation method, which uses a plunger that moves up and down by rotating a handle, and a plunger that allows the tip of the plunger to be inserted. The resin is injected under pressure into the plaster mold of the flask, which is made up of a mochi-shaped resin storage cylinder, without rotating the handle. During this pressurized injection process, confirm that the resin is poured out through the vent. After that, the resin is heated and polymerized according to conventional methods.

つまり６０°Ｃで３０分係留後１００℃で３０分係留す
るものである。That is, it is moored at 60°C for 30 minutes and then at 100°C for 30 minutes.

これは歯科業界で長く用いられているアクリル樹脂製義
歯を一回の埋没で製作しようとするものであるが、この
ようなアクリル樹脂製品は口腔内の．咬合圧によ９破損
する程強度的に弱い上に残留モノマーが溶出してアレル
ギーを起ζすため衛生上の欠点もあシ、さらに長時間の
加熱重合を要するため重合のバラツキによ９表面肌も荒
く審美性に欠ける等多くの欠点を有する低品質の商品で
あシながら生産性も悪くコスト高になっている。This is an attempt to manufacture acrylic resin dentures, which have been used for a long time in the dental industry, with a single implantation, but such acrylic resin products are difficult to maintain in the oral cavity. In addition to being so weak that it can be damaged by occlusal pressure, it also has hygienic drawbacks because residual monomers can be eluted and cause allergies.Furthermore, it requires a long heating polymerization time, which can result in uneven polymerization. It is a low-quality product with many drawbacks such as rough skin and lack of aesthetics, but it also has poor productivity and high cost.

本発明は長年克服出来なかった上記欠点を全く一掃し得
るものであ９、石膏型に超高速射出可能な射出成形機を
用いてポリサル７オン樹脂等の超硬質樹脂を、超高速射
出せしめる全く新しい方法にして、０．１−１φｍｍ内
の径をもつエアーベントから脱気しながら０．０１〜０
．５秒位の超高速度に射出成形し、かつ、樹脂硬化によ
りエアーベントを封鎖して樹脂収縮による内圧降下の検
知を可能ならしめたから残留モノマー、加熱重合のバラ
ツキが無く、高い強度性をもち審美性にも秀れている超
硬質樹脂製品が高精度で表面状態が緻密で内部が単層状
態に成形されるから石膏型による樹脂製品として非常に
秀れたものを能率的に得られることになる。The present invention completely eliminates the above-mentioned drawbacks that have not been overcome for many years.9 It is possible to inject ultra-hard resin such as Polysal 7-on resin into a plaster mold at ultra-high speed using an injection molding machine capable of ultra-high-speed injection. Using a new method, while degassing from an air vent with a diameter of 0.1-1φmm,
．． Injection molding is carried out at an ultra-high speed of about 5 seconds, and the air vent is sealed by resin curing, making it possible to detect the internal pressure drop due to resin contraction, so there is no residual monomer, no variation in heating polymerization, and high strength. Ultra-hard resin products with excellent aesthetics are molded with high precision, a dense surface condition, and a single layer inside, making it possible to efficiently obtain extremely excellent resin products using plaster molds. become.

この場合、石膏型は脆くて射出圧を大きくすれば直ちに
破損する。In this case, the plaster mold is brittle and will break immediately if the injection pressure is increased.

その上石膏型は金型のように鏡面を形成出来ないうえ空
洞内面肌は軟質になり、さらに熱伝導率も低い等の多く
の不利な点をもつため、ポリサル７オン樹脂等の粘性の
大きい超硬質樹脂を石膏型で成形して高品質の樹脂成品
を得ることは不可能とされていたが本発明は上記設定条
件において０．１〜１φ龍のエア脱気孔よりエアを抜き
ながら０．０１〜０．５秒位の超高速度に射出成形せし
めることによシそれを可能ならしめたから多大な効果を
発揮する。Moreover, unlike molds, plaster molds cannot form a mirror surface, the inner surface of the cavity is soft, and they have many disadvantages such as low thermal conductivity, so they cannot be used with highly viscous resins such as Polysal 7-on resin. It was thought that it was impossible to obtain a high quality resin product by molding ultra-hard resin with a plaster mold, but the present invention allows air to be removed from a 0.1 to 1φ dragon air degassing hole under the above setting conditions. This has been made possible by injection molding at an ultra-high speed of about 0.01 to 0.5 seconds, which provides a great effect.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は肉厚の平均した成型品を成型する状態を示す縦
断面図、第２図は最大肉厚部Ａと肉薄部Ｂからなる成型
品を一体成型する状態を示す縦断面図、第３図乃至第５
図は斜視図、第６図は冷却加熱装置を装備したフラスコ
内の状態を示す平断面図、第７図は肉薄な口蓋面を有す
る歯科補綴物を成型する状態を示す縦断面図である。 １・・・・・・樹脂成型部、２・・・・・・下部フラス
コ、３・・・・・・上部フラスコ、４・・・・・・スプ
ルーランナー，６・・・・・・石膏、７・・・・・・石
膏型部、８・・・・・・射出孔、９・・・・・・内圧検
知用センサーピン、１０・・・・・・冷却パイプ、１１
・・・・・・加熱パイプ、Ａ・・・・・・肉厚部、Ｂ・
・・・・・肉薄部。Fig. 1 is a vertical cross-sectional view showing a state in which a molded product with an average wall thickness is molded; Figures 3 to 5
The figure is a perspective view, FIG. 6 is a plan sectional view showing the state inside the flask equipped with a cooling and heating device, and FIG. 7 is a longitudinal sectional view showing the state in which a dental prosthesis having a thin palatal surface is molded. 1... Resin molding part, 2... Lower flask, 3... Upper flask, 4... Sprue runner, 6... Plaster, 7... Plaster mold part, 8... Injection hole, 9... Sensor pin for internal pressure detection, 10... Cooling pipe, 11
... Heating pipe, A ... Thick wall part, B.
...Thin part.

Claims (1)

【特許請求の範囲】[Claims] １ ワックスのような融解排出できる材料で形成きれた
模型を耐圧フラスコに収容し、その模型とフラスコ側面
に設けられた射出孔を前記融解排出できる材料で形成さ
れるスプルーランナーにより横方向に連結し、模型とフ
ラスコ側面に設けられたエアー脱気孔を前記材料で形成
されるエアーベントにより横方向に連結し、その模型と
スプルーランナー、エアーベントを融解排出して模型ス
ペースの空洞を囲繞する石膏型を形成し、スプルーラン
ナーに内圧検知制御装置の内圧検知用センサーピンを臨
ませ、耐圧フラスコの射出孔から軟化した樹脂を射出圧
入すると同時に樹脂が収縮して内圧降下する状態をセン
サーピンに感知させ、その内圧降下分だけ内圧検知制御
装置によシ樹脂を補充しながら成型品全体およびスプル
ーランナーの樹脂を冷却硬化し、その後石膏を破砕して
樹脂製品を得る樹脂製品製作法において、前記石膏型に
超高速射出可能な射出成形機を用いて、ポリサル７オン
樹脂等の超硬質樹脂を、０．１−１φ７ｆｔ７Ｉｔ内の
径をもつエアーベントから脱気しながら０．０ｌ〜０．
５秒位の超高速度に射出成形し、かつ、樹脂硬化により
エアーベントを封鎖して樹脂収縮による内圧降下の検知
を可能ならしめて、肉薄部と肉厚部を合せもつ成形品を
も極短時間で高精度に成形出来ることを特徴とする石膏
型における超硬質樹脂の射出成形法。1. A model made of a material that can be melted and discharged, such as wax, is housed in a pressure-resistant flask, and the model and an injection hole provided on the side of the flask are laterally connected by a sprue runner made of the material that can be melted and discharged. , a plaster mold in which the model and the air vent provided on the side of the flask are laterally connected by an air vent formed of the material, and the model, sprue runner, and air vent are melted and discharged to surround a cavity in the model space. The internal pressure detection sensor pin of the internal pressure detection control device is exposed to the sprue runner, and the softened resin is injected and press-fitted from the injection hole of the pressure flask, and at the same time, the sensor pin detects the state in which the resin contracts and the internal pressure drops. , the entire molded product and the resin in the sprue runner are cooled and hardened while replenishing the resin to the internal pressure detection control device by the amount of the internal pressure drop, and then the plaster is crushed to obtain the resin product. Using an injection molding machine capable of ultra-high-speed injection, ultra-hard resin such as Polysal 7-on resin is injected from 0.0l to 0.0l while degassing from an air vent with a diameter of 0.1-1φ7ft7It.
By injection molding at an extremely high speed of about 5 seconds, and by sealing off the air vent by curing the resin, it is possible to detect the drop in internal pressure due to resin contraction, making it possible to produce molded products with both thin and thick parts in an extremely short time. An injection molding method for ultra-hard resin in a plaster mold that is characterized by its ability to be molded with high precision in a short amount of time.
JP54079945A 1978-04-19 1979-06-25 Injection molding method of ultra-hard resin in plaster mold Expired JPS5910297B2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP54079945A JPS5910297B2 (en) 1979-06-25 1979-06-25 Injection molding method of ultra-hard resin in plaster mold
NL7909117A NL7909117A (en) 1979-06-25 1979-12-18 METHOD FOR MANUFACTURING RESIN OBJECTS BY USE OF A PLASTER FORM.
GB7943928A GB2051654B (en) 1979-06-25 1979-12-20 Method of producing resin articles using a plaster mould
CA000343102A CA1149566A (en) 1979-06-25 1980-01-04 Method of producing resin articles by use of plaster mold and the products thereof
DE3001366A DE3001366C2 (en) 1979-06-25 1980-01-16 Injection molding device for the production of plastic molded parts
DE19808000989U DE8000989U1 (en) 1979-06-25 1980-01-16 DEVICE FOR PRODUCING AN INJECTION MOLDING PRODUCT
IT47752/80A IT1128089B (en) 1979-06-25 1980-01-29 PROCEDURE FOR PRODUCING RESIN ITEMS WITH THE USE OF A PLASTER MOLD AND OBTAINED PRODUCTS
FR8010405A FR2459719A1 (en) 1979-06-25 1980-05-09 PROCESS FOR MANUFACTURING RESIN OBJECTS USING PLASTER MOLDS, AND PRODUCTS SO MANUFACTURED
US06/323,305 US4359435A (en) 1978-04-19 1981-11-20 Method for manufacturing plastic products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54079945A JPS5910297B2 (en) 1979-06-25 1979-06-25 Injection molding method of ultra-hard resin in plaster mold

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP12219578A Division JPS5549236A (en) 1978-10-04 1978-10-04 Manufacturing method and device for resin product for industrial-use model, etc.

Publications (2)

Publication Number Publication Date
JPS5549237A JPS5549237A (en) 1980-04-09
JPS5910297B2 true JPS5910297B2 (en) 1984-03-08

Family

ID=13704437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54079945A Expired JPS5910297B2 (en) 1978-04-19 1979-06-25 Injection molding method of ultra-hard resin in plaster mold

Country Status (7)

Country Link
JP (1) JPS5910297B2 (en)
CA (1) CA1149566A (en)
DE (2) DE3001366C2 (en)
FR (1) FR2459719A1 (en)
GB (1) GB2051654B (en)
IT (1) IT1128089B (en)
NL (1) NL7909117A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61180993U (en) * 1985-04-30 1986-11-11

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5266246A (en) * 1991-11-19 1993-11-30 Casco Tool & Extrusions, Inc. Method of forming a molded plastic part
CN104785712A (en) * 2015-03-25 2015-07-22 池州市华兴天骑精密机械铸造有限公司 Casting wax pattern processing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5214658A (en) * 1975-05-29 1977-02-03 Hisashi Kojima Method and device for controlling internal pressure in injection molding machine mold
JPS5361194A (en) * 1976-11-11 1978-06-01 Nobuyuki Iba Method and device for making false tooth by embedding at one time

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US2781547A (en) * 1951-12-26 1957-02-19 Honeywell Regulator Co Molding procedure and apparatus
FR1112273A (en) * 1954-10-07 1956-03-12 Press intended for the cold injection of plastics, for molding various objects
US3191225A (en) * 1962-10-30 1965-06-29 American Can Co Apparatus for control of material distrial in blow molded plastic articles
CH392056A (en) * 1960-04-28 1965-05-15 Ankerwerk Gebrueder Goller Method and device for the production of strength-favorable plastic parts from plastic masses
GB1052810A (en) * 1963-11-14
FR1539204A (en) * 1967-08-03 1968-09-13 Plastimonde Improvements to the plastic molding process by adjusting the control of the movement of the mold and the injection piston
US3628901A (en) * 1969-07-15 1971-12-21 New Britain Machine Co Means for monitoring product quality in a plastics injection-molding machine
DE2401168C3 (en) * 1974-01-10 1978-04-27 Control Process, Inc., Plantsville, Conn. (V.St.A.) Plastic injection molding machine for the production of injection molded parts, with a heating, a pressure measuring and a control device
DE2462405C2 (en) * 1974-01-10 1983-12-15 Control Process, Inc., Plantsville, Conn. Pressure measuring and control device for a plastic injection molding machine
CH608713A5 (en) * 1974-03-07 1979-01-31 Dentaire Ivoclar Ets Process and device for producing medical and dental precision mouldings from plastic

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5214658A (en) * 1975-05-29 1977-02-03 Hisashi Kojima Method and device for controlling internal pressure in injection molding machine mold
JPS5361194A (en) * 1976-11-11 1978-06-01 Nobuyuki Iba Method and device for making false tooth by embedding at one time

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61180993U (en) * 1985-04-30 1986-11-11

Also Published As

Publication number Publication date
GB2051654B (en) 1983-02-09
CA1149566A (en) 1983-07-12
IT8047752A0 (en) 1980-01-29
IT1128089B (en) 1986-05-28
FR2459719A1 (en) 1981-01-16
NL7909117A (en) 1980-12-30
GB2051654A (en) 1981-01-21
DE8000989U1 (en) 1981-04-02
DE3001366C2 (en) 1985-10-10
JPS5549237A (en) 1980-04-09
DE3001366A1 (en) 1981-01-08
FR2459719B1 (en) 1984-12-07

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