JP3590923B2 - Molding apparatus and molding method using the molding apparatus - Google Patents

Molding apparatus and molding method using the molding apparatus Download PDF

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JP3590923B2
JP3590923B2 JP28801398A JP28801398A JP3590923B2 JP 3590923 B2 JP3590923 B2 JP 3590923B2 JP 28801398 A JP28801398 A JP 28801398A JP 28801398 A JP28801398 A JP 28801398A JP 3590923 B2 JP3590923 B2 JP 3590923B2
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mold
molding
elastic
molding die
opening
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JP2000108139A (en
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昭徳 渡邉
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昭徳 渡邉
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Description

【0001】
【発明の属する技術分野】
本発明は精密な表面を有する成形物を成形するための成形装置及び成形方法にに関し、特に表面光沢、複雑な表面形状を精密に表現した成形物を成形するための成形装置及び該成形装置を用いた成形方法に関する。
【0002】
【従来技術】
表面形状が複雑なものや、逆テーパを有する成形物を通常の金属製割型で成形すると、成形物を型から取り出すのに工夫を要する。そのため、従来より表面形状が複雑なものや、逆テーパを有する成形物については、弾性成形型を利用して成形することが行われている(特開平6−24941号)。例えば、浸漬法によって得た弾性成形型のキャビティ内に流動性の成形材料を注入、充填し、加熱もしくは冷却して成形材料を固化、成形後、成形型の外周を離型カップで取り囲み、成形型の内外に圧力差を設けて成形物を離型し、成形型を移動してこれによって成形物を成形型より取り出している。
しかし、このような方法において、圧力差によって成形型を膨張さる際に成形物と成形型が擦れたり、或いは成形型を移動させる時に成形型がぶれたり、又は成形型の中心線に傾きが生じたりすることがあった。その結果、成形物表面に傷をつけたり、成形物表面に精密な模様付けができなかったり、或いは、得られた成形物をケース内に収納する例えば口紅のような製品では、成形物の傾きによりケースと成形物の中心線がずれて、製品とケースとが接触する等の不都合が生じ商品としての適性を得ることができない場合が生じた。
従って、従来の弾性成形型を用いて成形物を製造する場合、製品として要求される精度及び表面状態に自ずから弾性成形型の適用が限定される結果となっている。
【0003】
【発明が解説しようとする課題】
そこで、本発明者は弾性成形型を用いてより精度の高い、且つ表面光沢を有し、図柄等を正確に再現した成形物を収率良く成形するために種々検討した結果、本発明を完成したもので、本発明は精度の高い、且つ表面光沢を有し、図柄を正確に再現した成形物を収率良く成形するための成形装置及びその成形方法を提供することを目的とする。
【0004】
【課題を解決するための手段】
本発明は、弾性成形型と該成形型を取り囲む離型カップとよりなる成形装置であって、該弾性成形型はその一端に開口部を設け、他端は封じられており、前記開口部の周囲は鍔状としてリング状の支持枠によって固定されており、該成形型の開口部の中心と他端の先端面の中心とを結ぶ線上の該成形型の外面に凸部又は凹部を設けると共に前記離型カップに窪み部又は突起部を設け、常圧時前記凸部または凹部と前記窪み部または突起部とは小さな間隙を有し、離型時に弾性成形型を出来るだけ少なく移動させて前記弾性成形型の凸部又は凹部と前記離型カップの窪み部又は突起部とが嵌合することを特徴とする成形装置であり、又、弾性成形型と該成形型を取り囲む離型カップとよりなる成形装置により成型品を成形する方法であって、前記成形装置の弾性成形型は、その一端に開口部を設け、他端は封じられており、前記開口部の周囲は鍔状としてリング状の支持枠によって固定されており、該成形型の開口部の中心と他端の先端面の中心とを結ぶ線上の成形型の外面に凸部又は凹部を有する弾性成形型の内側に流動状材料を注入し、成形固化後、窪み部又は突起部を設けた離型カップをもって成形型を取り囲み、離型カップ内を減圧して弾性成形型を出来るだけ小さく移動させて成形型外面の凸部又は凹部を離型カップの窪み部又は突起部に嵌合させて離型することを特徴とする成型品を成形する方法である。
即ち、本発明においては弾性成形型で成形した後、弾性成形型の凸部又は凹部と離型カップの窪み部又は突起部とを嵌合させた状態で弾性成形型を固定して成形物を移動させるのであるから、弾性成形型がぶれたり或いは中心線より外れたりすることなく離型でき、その結果、成形物の表面が傷ついたり、成形物の中心線が傾いたりすることなく、図柄を有する成形物については、成形物表面に正確に図柄を再現した所望の形状の製品を収率良く得ることが出来る。
【0005】
【発明の実施の形態】
更に、本発明について詳細に説明する。
本発明の弾性成形型を構成する材質としては天然ゴム、クロロプレンゴム、ニトリル−ブタジジエンゴム、シリコーンゴム、フッ素ゴム、ウレタンゴムその他エラストマーであり、その成形方法は特に限定はされないが、例えば天然ゴム、クロロプレンゴム、ニトリル−ブタジジエンゴムなどの場合は、これらのラテックス中に原型を浸漬して成形する浸漬成形法により、その他のエラストマーについては加圧成形法や射出成形法等の任意の成形法によって得られる。弾性成形型の形状は一端に被成形物が注入できる開口部を有し、成形型先端部の外面には型の開口部の中心と型先端部とを結ぶ線上に凸部又は凹部を設ける。そして、成形型内面には成形物表面につける図柄が施されていても良い。
本発明において、離型カップには成形型の外面に設けられている凸部又は凹部に対応する窪み部又は突起部が形成されている。成形型の凸部又は凹部の寸法としては離型時に異常に変形しない程度の大きさであれば充分である。また、凸部に代えて弾性成形型の先端部を円錐状としてもよい。一方、離型カップには上記の凸部又は凹部に対応する窪み部或いは突起部或いは円筒上の孔を設けてもよく、弾性成形型と嵌合できるようにし、離型時に成形型と離型カップとが一体として移動すれば良い。
【0006】
成形型の凸部と離型カップの窪み部或いは成形型の凹部と離型カップの突起部との間隙について、常圧時の高さ方向の間隙は、減圧時に成形型の移動により成形物が擦れることを避けるための必要最小限の間隔である。これにより成形型の円周方向への膨張が強化され、シャープな造形が得られる。
充填時、成形型と離型カップとの側面の間隙は、成形型と成形物との剥離するために充分な間隔で、離型時に成形物を垂直方向に移動する際に成形型と成形物とが擦れない程度であれば良く、間隙が大きいと、成形型に過度の膨張をもたらし、成形型の劣化を招くことがある。
【0007】
本発明の成形装置を図1に図示する。図1において、弾性成形型1の一端に開口部2を設け、他端は封じられておりその外面には凸部7が突設している。開口部2の周囲を鍔状とし、鍔部3はリング状の支持枠4で固定する。この鍔部3と開口部の縁とを曲面でつなげておくことによって離型時に開口部入口の膨張が円滑に行われるので好ましい。一方、この弾性成形型1を包囲する離型カップ5には内部を減圧にするための吸気孔6を設け、離型カップ5の上部を前記支持枠4で密着するようにする。また、離型カップ5の底面には離型時に弾性成形型1の凸部7に嵌合する窪み部8を設ける。
このような装置において、弾性成形型1の開口部2より成形原料の流動体を型内1に注入し、冷却固化後、離型カップの上縁部を弾性成形型1の支持枠4に密着させ、吸気孔6より減圧とすると、弾性成形型1は膨張して成形物より離れ、弾性成形型の凸部7が離型カップの窪み部8に嵌合し、弾性成形型1は固定され、ぶれや中心線の傾きを生じることなく離型することが出来る。
また、本発明においては、離型カップの上縁部が、弾性成形物1の支持枠4に密着して固定されているので安定して離型が行われる。
本発明の弾性成形型で成形するものとして口紅、チョコレート、冷菓、石鹸、ゼリー、かまぼこ、石膏、その他デザイン性を要求される流動体の材料を冷却・加熱により固化されるものであれば何れでも良い。特に成形物が軟らかくその表面に傷がつきやすいものや、正確に収納器内に収納するものを収率良く成形するために有効である。
【0008】
【実施例及び比較例】
次に実施例をもって、本発明を更に具体的に説明する
実施例1
図1の装置を用いて次の表1に示した処方よりなる口紅を成形する。
成形型の開口部に上端部に注入口のある保持具をセットした後、表1の口紅処方によって作成した原料をノズルより保持具上端の注入口を通して成形型内に原料を充填し、固化して口紅と保持具と一体として成形した。弾性成形型の外周に取付けてある凸部と離型カップの窪みとの間隙は0.1mmであった。続いて、離型カップ内を減圧として弾性成形型を膨張させ、弾性成形型の凸部を離型カップの窪み部に嵌合させて弾性成形型を垂直方向に移動させて成形物を離型させてケースと共に成形物を取り出した。得られた口紅の外観は全面に光沢があって、傷は存在せず、これを口紅収納容器に収納したところ、口紅の中心と容器の中心とは一致して安定した収納状態であった。
【0009】
【表1】

Figure 0003590923
【0010】
実施例2
実施例1と同様に、図1の装置を用い、実施例1の表1の口紅処方によって作成した原料を使用して口紅を作成した。ただ、弾性成形型の外周に設けた凸部と離型カップの窪み部との間隙は10mmであった。この成形型内に先の原料を注入し、成形後、実施例1と同様に離型カップ内を減圧として弾性成形型を膨張させ、弾性成形型の凸部を離型カップの窪み部に嵌合させて弾性型を引き下げて成形物を離型させた。得られた口紅の外観は全面に光沢はあるが、先端部に成形型で擦られたと見られる傷が若干見られたが、口紅収納容器に収納したところ口紅の中心と容器の中心とは一致し、実施例1の場合同様に安定して収納された。
【0011】
比較例1
実施例1と同様に、図1の装置を用い、実施例1の表1の口紅処方によって作成した原料を使用して口紅を作成した。ただ、弾性成形型の外周には凸部は存在せず、又、離型カップの底面は平で窪み部は存在せず、その間隔は大きかった。得られた口紅の先端部及び側面部には擦れ傷が存在し、口紅ケースに収納時にはケースの中心とぶれがあって不安定であった。
【0012】
【発明の効果】
以上述べたように、本発明においては弾性成形型の外面に凸部又は凹部を設けると共に該成形型を取り囲む離型カップに窪み部又は突起部を設け、離型時にこれらを嵌合させて離型するので、離型時における弾性成形型のぶれや擦れによる傷を防止でき、又、図柄も精密に再現でき、その結果、得られる成形物の表面は傷がなく美麗であり、容器に収納する成形物においては、容器の中心線と成形物との中心線が一致し、安定して収納できる等の効果を奏する。
【図面の簡単な説明】
【図1】本発明の弾性成形型の縦断面図。
【符号の説明】
1 弾性成形型 2 開口部 3 鍔部
4 弾性成形型支持体 5 離型カップ 6 吸気孔
7 凸部 8 窪み部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding apparatus and a molding method for molding a molded article having a precise surface, and particularly relates to a molding apparatus and a molding apparatus for molding a molded article that accurately expresses a surface gloss and a complicated surface shape. It relates to the molding method used.
[0002]
[Prior art]
When a molded product having a complicated surface shape or having a reverse taper is molded using a normal metal split mold, a device is required to remove the molded product from the mold. For this reason, moldings having a complicated surface shape or having a reverse taper have been conventionally performed using an elastic mold (JP-A-6-24941). For example, a flowable molding material is injected and filled into a cavity of an elastic molding die obtained by an immersion method, and the molding material is solidified by heating or cooling. After molding, the outer periphery of the molding die is surrounded by a release cup, and molding is performed. A molded article is released by providing a pressure difference between the inside and outside of the mold, and the molded article is moved to thereby remove the molded article from the mold.
However, in such a method, when the mold is expanded due to a pressure difference, the molded article rubs with the molded article, or when the mold is moved, the mold is shaken, or the center line of the mold is inclined. Or something. As a result, the surface of the molded product may be damaged, or the surface of the molded product may not be accurately patterned, or the obtained molded product may be stored in a case such as a lipstick. The center line between the case and the molded product is displaced, causing inconvenience such as contact between the product and the case, and the case where suitability as a product cannot be obtained.
Therefore, when a molded product is manufactured using a conventional elastic mold, the application of the elastic mold is naturally limited by the accuracy and surface condition required as a product.
[0003]
[Problem to be Explained by the Invention]
The inventor of the present invention has conducted various studies using an elastic mold to obtain a molded product with higher accuracy, surface gloss, and accurate reproduction of a design, etc., with a high yield. SUMMARY OF THE INVENTION It is an object of the present invention to provide a molding apparatus and a molding method for molding a molded product having high accuracy, high surface gloss, and accurately reproducing a pattern with good yield.
[0004]
[Means for Solving the Problems]
The present invention is a molding apparatus comprising an elastic mold and a release cup surrounding the mold, wherein the elastic mold has an opening at one end and the other end is sealed, The periphery is fixed by a ring-shaped support frame as a flange, and a convex portion or a concave portion is provided on the outer surface of the mold on a line connecting the center of the opening of the mold and the center of the tip surface of the other end. The release cup is provided with a concave portion or a protrusion, and at normal pressure, the convex or concave portion and the recess or the protrusion have a small gap, and at the time of release, the elastic mold is moved as little as possible. a molding apparatus and a recess or protrusion of the releasing cup with projections or recesses of the elastic mold, characterized in that the fitting, also more a release cup surrounding the elastic mold and forming die Molding method using a molding device The elastic molding die of the molding device has an opening at one end, the other end is sealed, and the periphery of the opening is fixed by a ring-shaped support frame as a flange, and the opening of the molding die is The fluid material is injected into the inside of an elastic mold having a convex or concave portion on the outer surface of the mold on a line connecting the center of the other end and the center of the tip surface of the other end, and after molding and solidification, a recess or a projection is provided. Surrounding the mold with the mold release cup, depressurizing the inside of the mold release cup, moving the elastic mold as small as possible, and fitting the convex or concave part on the outer surface of the mold into the concave part or protrusion of the mold release cup. This is a method of forming a molded product characterized by being released from the mold .
That is, after forming an elastic mold in the present invention, a molded product by fixing the elastic mold in a state where the fitting the recess portion or the protruding portion of the convex portion or concave portion and the releasing cup elastic mold Since it is moved, the mold can be released without the elastic mold being shaken or deviating from the center line, and as a result, the pattern can be formed without damaging the surface of the molded article or tilting the center line of the molded article. With respect to the molded product, a product having a desired shape in which a pattern is accurately reproduced on the surface of the molded product can be obtained with high yield.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Further, the present invention will be described in detail.
Materials constituting the elastic mold of the present invention include natural rubber, chloroprene rubber, nitrile-butadiene rubber, silicone rubber, fluorine rubber, urethane rubber and other elastomers, and the molding method is not particularly limited. In the case of rubber, nitrile-butadiene rubber, or the like, it can be obtained by an immersion molding method in which a prototype is immersed in these latexes for molding, and other elastomers can be obtained by any molding method such as a pressure molding method or an injection molding method. The shape of the elastic mold has an opening at one end into which a molded object can be injected, and a convex or concave portion is provided on the outer surface of the tip of the mold on a line connecting the center of the opening of the mold and the tip of the mold. Then, a pattern to be attached to the surface of the molded product may be provided on the inner surface of the molding die.
In the present invention, the release cup has a depression or a projection corresponding to the projection or the depression provided on the outer surface of the mold. It is sufficient that the size of the protrusions or recesses of the mold is such that it does not abnormally deform during mold release. Further, instead of the convex portion, the tip of the elastic molding die may have a conical shape. On the other hand, the release cup may be provided with a depression or a projection corresponding to the above-mentioned projection or depression, or a hole on a cylinder, so that the release cup can be fitted with the elastic molding die. It is only necessary that the cup moves as one.
[0006]
Regarding the gap between the protrusion of the mold and the recess of the mold cup or the recess of the mold and the protrusion of the mold cup, the gap in the height direction at normal pressure is This is the minimum interval required to avoid rubbing. As a result, the expansion of the mold in the circumferential direction is enhanced, and a sharp molding is obtained.
At the time of filling, the gap between the side surfaces of the mold and the mold release cup is sufficient to separate the mold and the mold, and the mold and the mold are moved when the mold is moved vertically in the mold release. If the gap is large, the mold may be excessively expanded, which may cause deterioration of the mold.
[0007]
FIG. 1 shows a molding apparatus according to the present invention. In FIG. 1, an opening 2 is provided at one end of an elastic mold 1 and the other end is sealed, and a projection 7 projects from the outer surface thereof. The periphery of the opening 2 is formed in a flange shape, and the flange portion 3 is fixed by a ring-shaped support frame 4. It is preferable that the flange 3 and the edge of the opening are connected by a curved surface, so that the opening entrance can be smoothly expanded at the time of release. On the other hand, the release cup 5 surrounding the elastic mold 1 is provided with an intake hole 6 for reducing the pressure inside, so that the upper part of the release cup 5 is brought into close contact with the support frame 4. In addition, a depression 8 is provided on the bottom surface of the release cup 5 so as to fit into the projection 7 of the elastic molding die 1 at the time of release.
In such an apparatus, a fluid of a molding raw material is injected into the mold 1 from the opening 2 of the elastic mold 1, and after cooling and solidifying, the upper edge of the release cup is brought into close contact with the support frame 4 of the elastic mold 1. When the pressure is reduced through the intake hole 6, the elastic molding die 1 expands and separates from the molded product, the projection 7 of the elastic molding die fits into the recess 8 of the release cup, and the elastic molding die 1 is fixed. The mold can be released without blurring or inclination of the center line.
Further, in the present invention, the upper edge portion of the release cup is fixed in close contact with the support frame 4 of the elastic molded product 1, so that the release is performed stably.
Lipstick, chocolate, frozen dessert, soap, jelly, kamaboko, gypsum, and any other fluid material that requires design properties can be solidified by cooling and heating as a material to be molded with the elastic mold of the present invention. good. In particular, it is effective for molding a molded product that is soft and easily scratched on its surface, or that is accurately stored in a container with high yield.
[0008]
[Examples and Comparative Examples]
EXAMPLE 1 Next, the present invention will be described in more detail with reference to Example 1.
A lipstick having the formulation shown in the following Table 1 is formed using the apparatus shown in FIG.
After setting the holder having an inlet at the upper end in the opening of the mold, the raw material prepared by the lipstick prescription of Table 1 is filled with the raw material into the mold through the inlet at the upper end of the holder from the nozzle and solidified. It was molded integrally with the lipstick and the holder. The gap between the protrusion attached to the outer periphery of the elastic mold and the depression of the release cup was 0.1 mm. Subsequently, the inside of the release cup is depressurized to expand the elastic molding die, the projection of the elastic molding die is fitted into the recess of the release cup, and the elastic molding die is moved vertically to release the molded product. The molded product was taken out together with the case. The appearance of the obtained lipstick was glossy on the entire surface and there was no scratch. When the lipstick was stored in a lipstick storage container, the center of the lipstick and the center of the container were in a stable storage state.
[0009]
[Table 1]
Figure 0003590923
[0010]
Example 2
A lipstick was prepared in the same manner as in Example 1, using the apparatus shown in FIG. However, the gap between the projection provided on the outer periphery of the elastic mold and the depression of the release cup was 10 mm. The above-mentioned raw material is poured into this mold, and after molding, the inside of the release cup is depressurized to expand the elastic mold as in Example 1, and the projection of the elastic mold is fitted into the recess of the mold cup. Then, the elastic mold was pulled down to release the molded product. The appearance of the obtained lipstick was glossy on the whole surface, but some scratches were seen at the tip which seemed to have been rubbed with the molding die, but when stored in the lipstick storage container, the center of the lipstick was Thus, it was stably stored in the same manner as in Example 1.
[0011]
Comparative Example 1
In the same manner as in Example 1, a lipstick was prepared using the raw material prepared according to the lipstick prescription of Table 1 of Example 1 using the apparatus of FIG. However, there were no protrusions on the outer periphery of the elastic molding die, and the bottom surface of the release cup was flat and had no depressions, and the spacing was large. The obtained lipstick had scratches on the tip and side portions, and when stored in the lipstick case, it was blurred from the center of the case and was unstable.
[0012]
【The invention's effect】
As described above, in the present invention, a convex portion or a concave portion is provided on the outer surface of the elastic mold, and a concave portion or a projecting portion is provided in a release cup surrounding the mold, and these are fitted and separated at the time of mold release. Since it is molded, it can prevent the elastic mold from scratching and rubbing at the time of release, and the pattern can be reproduced precisely. As a result, the surface of the obtained molded product is beautiful without scratches and stored in a container In such a molded article, the center line of the container and the center line of the molded article coincide with each other, and effects such as stable storage can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an elastic mold according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elastic molding die 2 Opening part 3 Flange part 4 Elastic molding die supporter 5 Release cup 6 Intake hole 7 Convex part 8 Depressed part

Claims (4)

弾性成形型と該成形型を取り囲む離型カップとよりなる成形装置であって、該弾性成形型はその一端に開口部を設け、他端は封じられており、前記開口部の周囲は鍔状としてリング状の支持枠によって固定されており、該成形型の開口部の中心と他端の先端面の中心とを結ぶ線上の該成形型の外面に凸部又は凹部を設けると共に前記離型カップに窪み部又は突起部を設け、常圧時前記凸部または凹部と前記窪み部または突起部とは小さな間隙を有し、離型時に弾性成形型を出来るだけ少なく移動させて前記弾性成形型の凸部又は凹部と前記離型カップの窪み部又は突起部とが嵌合することを特徴とする成形装置。A molding device comprising an elastic mold and a release cup surrounding the mold, wherein the elastic mold has an opening at one end, the other end is sealed, and the periphery of the opening is a flange. The mold is provided with a convex or concave portion on the outer surface of the molding die on a line connecting the center of the opening of the molding die and the center of the tip surface of the other end. A concave portion or a protruding portion is provided, and the convex portion or the concave portion and the concave portion or the protruding portion at normal pressure have a small gap, and the elastic molding die is moved as little as possible at the time of release from the elastic molding die. A molding device, wherein a projection or a recess fits into a depression or a projection of the release cup. 前記弾性成形型の内面に凹凸状の模様が施されていることを特徴とする請求項1記載の成形装置。2. The molding apparatus according to claim 1, wherein an uneven pattern is formed on an inner surface of the elastic molding die. 前記弾性成形型の開口部と該開口部の周囲の鍔部は曲面でつながっていることを特徴とする請求項1又は2記載の成形装置。The molding apparatus according to claim 1, wherein an opening of the elastic molding die and a flange around the opening are connected by a curved surface. 弾性成形型と該成形型を取り囲む離型カップとよりなる成形装置により成型品を成形する方法であって、前記成形装置の弾性成形型は、その一端に開口部を設け、他端は封じられており、前記開口部の周囲は鍔状としてリング状の支持枠によって固定されており、該成形型の開口部の中心と他端の先端面の中心とを結ぶ線上の成形型の外面に凸部又は凹部を有する弾性成形型の内側に流動状材料を注入し、成形固化後、窪み部又は突起部を設けた離型カップをもって成形型を取り囲み、離型カップ内を減圧して弾性成形型を出来るだけ小さく移動させて成形型外面の凸部又は凹部を離型カップの窪み部又は突起部に嵌合させて離型することを特徴とする成型品を成形する方法 A method of molding a molded product by a molding device comprising an elastic molding die and a release cup surrounding the molding die, wherein the elastic molding die of the molding device has an opening at one end and the other end is sealed. The periphery of the opening is fixed by a ring-shaped support frame as a flange, and is convex on the outer surface of the molding die on a line connecting the center of the opening of the molding die and the center of the tip end surface at the other end. After injecting the fluid material into the inside of the elastic mold having a concave portion or a concave portion, solidifying the molding, surrounding the mold with a release cup provided with a concave portion or a projection portion, depressurizing the inside of the release cup and reducing the elastic mold. A method of molding a molded product, wherein the mold is moved by as small as possible to fit a convex portion or a concave portion of the outer surface of the molding die into a concave portion or a projecting portion of the release cup and release the mold .
JP28801398A 1998-10-09 1998-10-09 Molding apparatus and molding method using the molding apparatus Expired - Fee Related JP3590923B2 (en)

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