JPS606244A - Manufacture of simple mold for molding plastic - Google Patents
Manufacture of simple mold for molding plasticInfo
- Publication number
- JPS606244A JPS606244A JP11364583A JP11364583A JPS606244A JP S606244 A JPS606244 A JP S606244A JP 11364583 A JP11364583 A JP 11364583A JP 11364583 A JP11364583 A JP 11364583A JP S606244 A JPS606244 A JP S606244A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- low melting
- flask
- molding
- gypsum
- 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
- 238000000465 moulding Methods 0.000 title claims abstract description 23
- 239000004033 plastic Substances 0.000 title abstract 2
- 238000004519 manufacturing process Methods 0.000 title description 4
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 23
- 239000010440 gypsum Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 229920001971 elastomer Polymers 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000002023 wood Substances 0.000 claims abstract description 6
- 229910000743 fusible alloy Inorganic materials 0.000 claims abstract 6
- 229920003002 synthetic resin Polymers 0.000 claims description 18
- 239000000057 synthetic resin Substances 0.000 claims description 18
- 239000011505 plaster Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 18
- 239000000956 alloy Substances 0.000 abstract description 18
- 229920002379 silicone rubber Polymers 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000004945 silicone rubber Substances 0.000 abstract description 3
- 239000004944 Liquid Silicone Rubber Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000001746 injection moulding Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 17
- 230000008018 melting Effects 0.000 description 16
- 239000007788 liquid Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000009415 formwork Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000009423 ventilation Methods 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
- B29C33/3857—Manufacturing moulds, e.g. shaping the mould surface by machining by making impressions of one or more parts of models, e.g. shaped articles and including possible subsequent assembly of the parts
- B29C33/3878—Manufacturing moulds, e.g. shaping the mould surface by machining by making impressions of one or more parts of models, e.g. shaped articles and including possible subsequent assembly of the parts used as masters for making successive impressions
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（目的）
本発明は合成樹脂成形用の簡易型の作成方法に関し、そ
の目的は低融点合金を利用し、寸法精度が高く且つ耐久
性に富んだ簡易型を提供するにある。[Detailed Description of the Invention] (Objective) The present invention relates to a method for creating a simple mold for synthetic resin molding, and its purpose is to provide a simple mold that uses a low melting point alloy and has high dimensional accuracy and durability. It is in.
（従来技術）
従来Ｊ：り合成樹脂成形用の型としては金属を切削加工
して形成したいわゆる金型が利用されているが、これは
高価であると共に型の製作に長期間を要する。(Prior Art) Conventional J: So-called metal molds formed by cutting metal are used as molds for molding synthetic resins, but these are expensive and require a long period of time to manufacture.
このため小ロツト製品の成形や試作品の成形に金型を利
用すると、製品０１価の高騰や試作期間の長期化を招く
ので、このような用途には知朋間で安価に製作すること
の出来る簡易型の利用が望まれている。For this reason, if molds are used to mold small-lot products or prototypes, the product price will rise and the trial production period will be prolonged. It is desired to use the simplest version possible.
従来の合成樹脂成形用の簡易型の作成は、金属粉や耐火
物粉の入った二液硬化型の液状樹脂や低融点合金を利用
して行われているが、従来の簡易型は型の寸法精度、強
度などに問題があって実用化はなかなか困難であった。Traditionally, simple molds for synthetic resin molding are created using two-component curing liquid resins or low-melting point alloys containing metal powder or refractory powder. Practical use was difficult due to problems with dimensional accuracy and strength.
液状樹脂による簡易型の作成は、金属粉、耐火物粉など
を配合したエポキシ樹脂、ポリウレタン樹脂などの二液
型液状樹脂を利用し、機械加工によって形成された原型
を収容した型枠内に前記液状樹脂を注入硬化させ型取り
することによって行われる。To create a simple mold using liquid resin, use a two-component liquid resin such as epoxy resin or polyurethane resin mixed with metal powder, refractory powder, etc. This is done by injecting and hardening a liquid resin and then molding it.
この液状樹脂によって形成された簡易型は、金属粉、耐
火物粉などが混入されているとはいえ基本的には合成樹
脂製であるため耐熱性及び機械的強度が劣り、合成樹脂
成形時の熱や圧力などの影響で型の変形、破壊などが生
じ、良好な成形品を得ることは回動である。Although simple molds made from this liquid resin are mixed with metal powder, refractory powder, etc., they are basically made of synthetic resin, so they have inferior heat resistance and mechanical strength, and when molded with synthetic resin. The deformation and destruction of the mold occur under the influence of heat and pressure, and rotation is the key to obtaining a good molded product.
また低融点合金を利用しての簡易型の作成は、機械加工
によって形成された原型に低融点合金を溶射して形取り
することによって行われていた。Furthermore, the creation of simple molds using low melting point alloys has been carried out by spraying the low melting point alloy onto a master mold formed by machining and shaping it.
しかし低融点合金の溶銅によって形成された簡易型は、
型内への気泡の混入が避（プられす、合成樹脂成形時に
型の変形や破壊が生ずる欠点があり良好な成形品を得る
ことは回動であった。However, the simple type formed by molten copper of low melting point alloy is
This method had the disadvantages of avoiding air bubbles entering the mold and causing deformation and destruction of the mold during synthetic resin molding, and rotation was the only way to obtain a good molded product.
本発明は、前記した如き現状に鑑み、良好な合成樹脂成
形品を得ることの出来る簡易型を開発するため鋭意検討
を重ねた結果創案されたものである。The present invention was created as a result of intensive studies in view of the current situation as described above, in order to develop a simple mold capable of producing good synthetic resin molded products.
（構成）
すなわら本発明は、木材、合成樹脂などの加工性にすぐ
れた材料にて原型を形成する工程、該原型を型取りしゴ
ム型を形成Ｊ−る工程、該ゴム≧（りに水溶性樹脂及び
耐火物￥６）末の配合された石こうスラリーを注入硬化
さＬ！石こう型を形成刃る工程、脈石こう型を焼成づる
工程、該焼成された石こう型を溶融した低融点合金を利
用し減圧状態にて型取りし低融点合金金型を形成する工
程より成ることを特徴とげる合成樹脂成形用簡易！Ｉ＋
１の作成ノ“Ｊ法でありさらに評しく Ｉｊ実施例に基
く以下の説明の如くである。(Structure) In other words, the present invention includes a step of forming a model using a material with excellent workability such as wood or synthetic resin, a step of molding the model to form a rubber mold, and a step of forming a rubber mold by molding the model. A gypsum slurry containing water-soluble resin and refractory powder is injected into the L! Consisting of a step of forming a plaster mold, a step of firing the gangue mold, and a step of molding the fired plaster mold under reduced pressure using a molten low melting point alloy to form a low melting point alloy mold. Easy for synthetic resin molding! I+
This is the "J method" for the preparation of No. 1, and is further described as follows based on the Ij embodiment.
本発明の簡易型の作成方法第１図に示ザ如くであり、先
ず（ａ ）に示す如く、木材、合成樹脂などの加Ｉ （
；ｌにすぐれた材料を機械加工して形成した原型１を見
切り面作成ブロック２上に載置固定し、続いて（１））
に示す如く前記原型１が載置固定された児切り面作成ブ
ロック２の四周を≧１１１枠板３で囲んだ後枠内に挙記
硬化型の液状シリコーンゴム１を注入硬化させ、型枠板
３を外し原型１を抜き取ることによって（Ｃ）に示ず々
［１き原型１を型取りしたシリコーンゴム型５を得る。The method for producing a simple mold according to the present invention is shown in FIG. 1. First, as shown in (a), wood, synthetic resin, etc.
The prototype 1, which was formed by machining a material with excellent quality, is placed and fixed on the parting surface creation block 2, and then (1))
As shown in Figure 1, after surrounding the four circumferences of the cut surface making block 2 on which the master mold 1 is placed and fixed with ≧111 frame plates 3, the hardening type liquid silicone rubber 1 mentioned above is injected into the frame and cured, and then the mold plate is formed. 3 and extracting the master mold 1, a silicone rubber mold 5 obtained by molding the master mold 1 is obtained as shown in (C).
次に（〔１）に示す如くシリコーンゴム型５ｊの四周を
型枠板６で囲み枠内に水溶性樹脂及び耐火物粉末を混入
（）た石こうスラリー７を注入硬化させ、続いて水和硬
化した石こう型をゴム型より抜き取った後焼成を行って
石こうの完全硬化と配合された樹脂分の焼失とを計り適
度の多孔性を有する石こう型８を得る。Next, as shown in ([1)], the four peripheries of the silicone rubber mold 5j are surrounded by formwork plates 6, and a gypsum slurry 7 mixed with water-soluble resin and refractory powder is injected into the frame and hardened, followed by hydration hardening. After the gypsum mold is removed from the rubber mold, it is fired to completely harden the gypsum and burn out the blended resin, thereby obtaining a gypsum mold 8 having appropriate porosity.
前記（ａ ）から（ｄ ）までの工程により木材、合成
樹脂などの加工性に冨んだ材料を機械加工して形成した
原型１が、耐熱性にすぐれると共に適度の多孔性を有し
、しかも成形用の型に必要なパーティング面９も定めら
れた石こう型８に置き換えられた。The prototype 1 formed by machining a material with high workability such as wood or synthetic resin through the steps (a) to (d) above has excellent heat resistance and moderate porosity, Moreover, the parting surface 9 necessary for the molding mold was also replaced with a predetermined plaster mold 8.
続いて〈ｅ）に示す如く石こう型８を金網などの通気性
を有する棚板１２上に載置し、型枠板１０にて上部のみ
を開口して周囲を囲み、型枠板１０の棚板１２の固定部
より下方に設けた吸引口１３より真空ポンプ１４にて排
気を行いつつ低融点合金１１を枠の開口部Ｊ：り注入す
る。Next, as shown in <e), the plaster mold 8 is placed on a breathable shelf board 12 such as a wire mesh, and is surrounded by a formwork board 10 with only the upper part opened, and the shelf of the formwork board 10 is closed. The low melting point alloy 11 is injected into the opening J of the frame while exhausting air with a vacuum pump 14 through a suction port 13 provided below the fixed portion of the plate 12.
枠内に注入した低融点合金１１が冷却した後型枠板１０
を外し石こう型８を取り除くと（ｌに５−
示す如き低融点合金ににり形成されたｑ・Ｊ出成形用簡
易型１５が得られる。After the low melting point alloy 11 injected into the frame has cooled, form plate 10
When the plaster mold 8 is removed, a simple mold 15 for q/J extrusion molding made of a low melting point alloy as shown in 5-1 is obtained.
前記簡易型形成工程の石こう型を得る二「稈に於て利用
する石こうスラリーには、澱粉、ポリビニルアルコ−ル
どの水溶性樹脂及びクリストバライトのＪ：うな耐火物
粉末が配合されている。The gypsum slurry used in the culm for obtaining the gypsum mold in the simple mold forming step contains starch, a water-soluble resin such as polyvinyl alcohol, and refractory powder of cristobalite.
石こうスラリー中に耐火物粉末を添加するのは石こう型
に低融点合金を注入するので耐熱性を向上させる必要が
あるためであり、まＩζ水溶性樹脂を配合するのは石こ
うの水和硬化時の強度ツーなわら生型強度の向上と焼成
後右こう型に適度の通気性を持たＵて低融点合金を真空
注入し１ｑるようにするためである。The reason why refractory powder is added to the gypsum slurry is that it is necessary to improve heat resistance since a low melting point alloy is injected into the gypsum mold, and the reason why a water-soluble resin is added is when the gypsum hardens by hydration. This is to improve the strength of the green mold and to vacuum inject a low melting point alloy into the right mold with appropriate air permeability after firing.
石こうの生型強度は１０〜１５Ｋ（Ｉ程度の曲げ強度で
あって複雑形状の部品の型取りにはやや強度が不足し、
第２図（ａ）に示す如き薄肉で艮いリブ部１６を有する
ような部品の型を作成するため第２図（ｂ）に示す如く
この原型を型取りしたゴム型１７に石こうスラリー１８
を注入硬化させ６一
た場合、型扱きに際して第２図（Ｃ）に示す如く石こう
型１９のリブ部２０が折＋ｆｉ Ｌでしまう。The green mold strength of gypsum is 10 to 15K (bending strength of about I), which is somewhat insufficient for molding parts with complex shapes.
In order to create a mold for a part having a thin and thick rib portion 16 as shown in FIG. 2(a), gypsum slurry 18 is placed in a rubber mold 17 made from this prototype as shown in FIG. 2(b).
When the plaster mold 19 is injected and hardened, the rib portion 20 of the plaster mold 19 is folded away when handling the mold, as shown in FIG. 2(C).
したがって従来は石こう型を１ｑることの出来る部品形
状としては、リプ部は肉厚Ｑ、５ｎ＋ｎ＋つき出し高さ
１０〜１５…０１程度が限界である。Therefore, conventionally, the limit for a component shape that can be made into a plaster mold by 1q is that the lip part has a wall thickness of Q and a protrusion height of about 10 to 15...01.
これに対して石こうスラリー中に２重量％程度のポリビ
ニルアルコールを配合すると生型時の石こう強度は８０
〜１２５ Ｋｇ／ａｍ２程度の曲げ強度と向上し如何な
る複雑形状の部品の石こう型も形成させることが可能と
なる。On the other hand, when about 2% by weight of polyvinyl alcohol is added to the gypsum slurry, the gypsum strength in the green mold is 80%.
The bending strength is improved to about 125 Kg/am2, making it possible to form plaster molds of parts of any complex shape.
次に石こうスラリー中に水溶性樹脂を配合して得られた
石こう型を焼成すると型の強度が向上すると共に配合さ
れた樹脂分が炭化もしくは焼失して適度の通気性が与え
られ減圧下で低融点合金による型取りを行うことが可能
どなり、これにより栄の発生の無い良好な低融点合金型
が得られることになる。Next, when the gypsum mold obtained by blending a water-soluble resin into the gypsum slurry is fired, the strength of the mold is improved, and the blended resin is carbonized or burned out, providing appropriate air permeability and reducing the temperature under reduced pressure. It is now possible to make molds using melting point alloys, and as a result, it is possible to obtain good low melting point alloy molds without the occurrence of glazes.
（効果）
前記した如く本発明は、木材、合成樹脂などの加工性の
すぐれた材料を利用して原型を形成し、これを耐熱性及
び強度のすぐれ目つ適度の通気１′ｔ１を有する石こう
型に置き換え、この石こうＪ（ｌｊを利用ｌ）で減圧下
で低融点合金により型取りを行い合成樹脂成形用簡易型
を得る方法である。(Effects) As described above, the present invention utilizes a material with excellent workability such as wood or synthetic resin to form a prototype, and then molds it into a gypsum model that has excellent heat resistance and strength and has a suitable ventilation level 1't1. In this method, a simple mold for synthetic resin molding is obtained by replacing the mold with a mold and making a mold using this gypsum J (using lj) under reduced pressure with a low melting point alloy.
したがって本発明は、原型の製作が極めて容易であり、
１りられる低融点合金型は耐熱性及び寸法精度に優れて
いるとともに巣の発生も無いので強度的にもすぐれてい
る。Therefore, according to the present invention, it is extremely easy to produce a prototype;
The low melting point alloy type mentioned above has excellent heat resistance and dimensional accuracy, and also has excellent strength because it does not form cavities.
このため、ポリカーボネー１〜樹脂のような極めて成形
条件の厳しい合成樹脂を含め、あらゆる合成樹脂を良好
に成形することが可能どなり、合成樹脂部品の小ロツｌ
−成形や試作品の成形に多大の効果をもたらすことが出
来る。For this reason, it has become possible to mold all kinds of synthetic resins well, including synthetic resins that require extremely strict molding conditions, such as polycarbonate resins, making it possible to produce small batches of synthetic resin parts.
- It can bring great effects to molding and prototype molding.
第１図は本発明の簡易型形成］−程を示す−図、第２図
は従来例を示す図であり、１は原型、５はゴム型、８は
石こう型、１５は低融点合金型である。
特許出願人 蛇の目ミシン工業株式会社第１ 図
第２図Fig. 1 is a diagram showing the process of forming a simple mold according to the present invention, and Fig. 2 is a diagram showing a conventional example, where 1 is an original mold, 5 is a rubber mold, 8 is a plaster mold, and 15 is a low melting point alloy mold. It is. Patent applicant: Janome Sewing Machine Industry Co., Ltd. Figure 1 Figure 2
Claims (1)
形成する工程、該原型を型取りしゴム型を形成する工程
、該ゴム型に水溶性樹脂及び耐火物粉末の配合された石
こうスラリーを注入硬化させ石こう型を形成する工程、
該石こう型を焼成する工程、該焼成された石こう型を溶
融した低融点合金を利用し減圧状態にて型取りし低融点
合金金型を形成する工程より成ることを特徴とする合成
樹脂成形用簡易型の作成方法。A process of forming a model from a material with excellent workability such as wood or synthetic resin, a process of molding the model to form a rubber mold, and a gypsum slurry in which water-soluble resin and refractory powder are blended into the rubber mold. The process of injecting and hardening to form a plaster mold,
A synthetic resin molding product comprising the steps of firing the plaster mold, and molding the fired plaster mold under reduced pressure using a molten low melting alloy to form a low melting alloy mold. How to create a simple type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11364583A JPS606244A (en) | 1983-06-25 | 1983-06-25 | Manufacture of simple mold for molding plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11364583A JPS606244A (en) | 1983-06-25 | 1983-06-25 | Manufacture of simple mold for molding plastic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS606244A true JPS606244A (en) | 1985-01-12 |
| JPH0339776B2 JPH0339776B2 (en) | 1991-06-14 |
Family
ID=14617492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11364583A Granted JPS606244A (en) | 1983-06-25 | 1983-06-25 | Manufacture of simple mold for molding plastic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS606244A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63192532A (en) * | 1987-02-04 | 1988-08-09 | Hitachi Ltd | Simple manufacturing method for molding molds |
| FR2631861A1 (en) * | 1988-05-27 | 1989-12-01 | Staphane Sa | Process for the manufacture of an injection mould for a thermoplastic |
| JPH0331044U (en) * | 1989-07-28 | 1991-03-26 | ||
| EP0642904A1 (en) * | 1993-09-13 | 1995-03-15 | R. ALKAN & Cie. | Process for making a mould, particularly of bismaleimide resin |
| EP0629480A3 (en) * | 1993-06-17 | 1996-05-08 | Volkhard Kaehler | Method and apparatus for the manufacture of molds. |
| EP0992329A1 (en) * | 1998-10-07 | 2000-04-12 | Michel Brouwers (El-Zahra) | Method to produce enlarged or reduced copies of three dimensional structures, and copies made by this method |
| EP1551612A4 (en) * | 2002-09-06 | 2009-01-21 | Polyrock Technologies Llc | Methods and apparatus for replicating original objects |
-
1983
- 1983-06-25 JP JP11364583A patent/JPS606244A/en active Granted
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63192532A (en) * | 1987-02-04 | 1988-08-09 | Hitachi Ltd | Simple manufacturing method for molding molds |
| FR2631861A1 (en) * | 1988-05-27 | 1989-12-01 | Staphane Sa | Process for the manufacture of an injection mould for a thermoplastic |
| JPH0331044U (en) * | 1989-07-28 | 1991-03-26 | ||
| EP0629480A3 (en) * | 1993-06-17 | 1996-05-08 | Volkhard Kaehler | Method and apparatus for the manufacture of molds. |
| EP0642904A1 (en) * | 1993-09-13 | 1995-03-15 | R. ALKAN & Cie. | Process for making a mould, particularly of bismaleimide resin |
| FR2710000A1 (en) * | 1993-09-13 | 1995-03-24 | Alkan R & Cie | Process for manufacturing tools for molding synthetic resin parts, in particular bismaleimide resin. |
| EP0992329A1 (en) * | 1998-10-07 | 2000-04-12 | Michel Brouwers (El-Zahra) | Method to produce enlarged or reduced copies of three dimensional structures, and copies made by this method |
| EP1551612A4 (en) * | 2002-09-06 | 2009-01-21 | Polyrock Technologies Llc | Methods and apparatus for replicating original objects |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339776B2 (en) | 1991-06-14 |
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