JP2004025602A - Method of manufacturing undercut molded product - Google Patents

Method of manufacturing undercut molded product Download PDF

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Publication number
JP2004025602A
JP2004025602A JP2002185032A JP2002185032A JP2004025602A JP 2004025602 A JP2004025602 A JP 2004025602A JP 2002185032 A JP2002185032 A JP 2002185032A JP 2002185032 A JP2002185032 A JP 2002185032A JP 2004025602 A JP2004025602 A JP 2004025602A
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JP
Japan
Prior art keywords
core
molded product
movable
mold
cavity
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.)
Pending
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JP2002185032A
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Japanese (ja)
Inventor
Hatsuo Ogoshi
大越 初雄
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SHAIN KK
Shain KK
Original Assignee
SHAIN KK
Shain KK
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 SHAIN KK, Shain KK filed Critical SHAIN KK
Priority to JP2002185032A priority Critical patent/JP2004025602A/en
Publication of JP2004025602A publication Critical patent/JP2004025602A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an undercut molded product by which the undercut molded product can be manufactured using a material which is friendly to environments. <P>SOLUTION: The mold used for this method is constituted of a parallel core 5, formed in the approximately analogous shape to a cavity 4, which is arranged inside the cavity 4 formed by clamping a cavity side half 2 and a movable half, a core main body 11 and a movable core 12 which is housed in a fitting recessed part 13 of an approximately inverted truncated cone shape formed in the core main body 11. The movable core 12 is afloat from the fitting recessed part 13 by blowing air from an opening formed at the bottom of the recessed part 13 and the air flowing out of a gap between the inner wall face of the recessed part 13 and the outer wall face of the movable core 12, flows to the inside of a molded product A formed on the peripheral face of the parallel core 5. Consequently, the molded product A is expanded to facilitate the release of the molded product A from the parallel core 5. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、アンダーカットの成形品の製造方法に関する。
【0002】
【従来の技術】
従来、中空の人形の胴体、頭部、腕部、脚部などを成形する際、ローテーション金型やスラッシュ金型のキャビティ内に樹脂を注入し、ローテーション金型の場合は金型全体を回転させ、キャビティの内周面に均等に樹脂層を形成し、その状態で樹脂を硬化させた後、成形された成形品をローテーション金型から取り出す。スラッシュ金型の場合は加熱した金型の中に樹脂を注入し、型の内部に付着しない余分な樹脂は流しだし、付着した樹脂を再加熱して硬化させスラッシュ金型から取り出していた。
【0003】
【発明が解決しようとする課題】
しかしながら、上述の成形方法に用いられる樹脂としては一般的にPVC(塩化ビニル)が用いられているが、このPVCは人体に悪影響を及ぼす恐れがあることが環境保護団体などから指摘され、特に幼児の遊びの対象として用いられる人形にも使用されていたため、代替の樹脂を用いた成形品の出現が望まれていた。
【0004】
本発明は上記問題点を解消し、環境に優しい素材を用いたアンダーカットの成形品を製造することを可能にしたアンダーカットの成形品の製造方法を提供することをその課題とする。
【0005】
【課題を解決するための手段】
前記課題を解決するため、本発明に係るアンダーカットの成形品の製造方法は、以下の要件を備えることを特徴とする。
(イ)互いに相対的に離合するように配置された固定側金型と可動型金型とを型締めしたときに形成されるキャビティ内に置き中子を配置したこと
(ロ)上記置き中子は上記キャビティとほぼ相似状且つ、キャビティ内に配置された状態で上記固定側金型及び可動側金型の成形面と置き中子の成形面との間には一定の間隔が設定されるように形成し、上記キャビティ内に射出された樹脂を一定の肉厚にすること
(ハ)上記置き中子は中子本体と該中子本体に形成された略逆円錐台状の凹部に収容される可動中子とからなり、上記凹部の底部には中子本体の外部に貫通する貫通口の一端を開口させ、該貫通口を介して上記凹部内にエアーを吹き込み、上記可動中子を凹部から浮き上がらせ、吹き込んだエアーを凹部の内壁面と可動中子の外壁面との隙間から成形品の内側に流入させ、該成形品を膨張させて置き中子からの成形品の離型を容易にすること
【0006】
なお、前記樹脂が熱可塑性スチレン系エラストマーであり、射出成形に適す樹脂であればアンダーカットの成形品を成形することができ、しかも環境に優しい成形品を製造できるようにすることが好ましい。
【0007】
【発明の実施の形態】
図1は、本発明に係るアンダーカットの成形品の製造方法に適用される射出成形金型の一例を示し、この射出成形金型1は成形する成形品が人形の頭部の場合について説明するもので、固定側金型2に対し離合可能に配置された可動側金型3と、固定側金型2と可動側金型3とを型締めした際に形成されるキャビティ4内に配置される置き中子5とから構成されるもので、置き中子5は固定側金型2及び可動金型の成形面と置き中子5の成形面との間には一定の間隔が設定されるようにキャビティ4と相似状且つ、やや小さめに形成され、固定側金型2と可動側金型3との成形面2a、3aと置き中子5の成形面5aとが形成するキャビティ4内に樹脂を射出するとほぼ一定の肉厚の成形品が成形されるようになっている。
【0008】
そして、樹脂の硬化後に型開きして可動側金型3を固定側金型2から離反させ、更に可動側金型3から成形品Aが被った状態の置き中子5を取り外した後、置き中子5から成形品Aを抜き取ることができるようにしたものである。
【0009】
置き中子5は支持台10に支持された中子本体11と可動中子12とから構成され、全体として人形の頭部の形状をなしている(図3(a)参照)。可動中子12は中子本体11に形成された逆円錐台状の嵌合凹部13と同一形状の逆円錐台状に形成され(図3(b)参照)、中子本体11に形成された逆円錐台状の嵌合凹部13に嵌脱可能に収容され、嵌合時には可動中子12の側部周面12aは嵌合凹部13の内周面13aに密着するとともに可動中子12の上面12bは中子本体11の上面11bと面一になるように形成されている(図3(c)参照)。
【0010】
そして、中子本体11の上記嵌合凹部13の底面13bには底面から中子本体11の外部に貫通する貫通孔14の一端が開口し、貫通孔14の他端にはノズル15が取り付けられ、ノズル15から吹き込んだエアーは貫通孔14を通って開口部16から嵌合凹部13内に吹き込まれるようになっている。なお、上記貫通孔14は支持台10の部分の径はやや大きくなり段部17が形成されている。
【0011】
ところで、可動中子12には軸体20が取り付けられている。この軸体20は先端にはネジ部21が、後端には膨出して鍔部22がそれぞれ形成され、支持台10側の開口部18から貫通口14内に挿入して先端のネジ部21を可動中子12のネジ穴23に螺合することにより軸体20が可動中子12に固定され、軸体20は貫通口14内を図3(c)上で左右に摺動できるようになっている。この軸体20の摺動量は約1ミリ程度になるように可動中子12の底部から鍔部22までの長さが設定されている。つまり、可動中子12が中子本体11の嵌合凹部13内に嵌合しているときに鍔部22と貫通口14の段部17までの距離が1ミリ程度になるように軸体20が形成され、鍔部22が段部17に当接するまで右方向に摺動した時には下動中子12の上面12bは、中子本体11の上面11bから1ミリ程度だけ突出するようになっている。
【0012】
そして、図4(a)に示すように、ノズル15からエアーを吹き込んだときには軸体20は前方(図4(b)上で右方向)に押され、可動中子12の上面12bが中子本体11の上面11bから突出し、嵌合凹部13の内周面13aと可動中子12の外周面12aとの間に隙間が生じるので貫通孔14と軸体20の隙間を通過したエアーは嵌合凹部13と可動中子12との隙間を通って置き中子5の外部に噴出するようになっている。
【0013】
なお、ノズル15から空気を吹き込んだ際、可動中子12が押し出されるが軸体20の膨出部22が貫通孔14の段部17に当接して軸体20の摺動量が制限されるので、可動中子12の上面は中子本体11の上面より突出する量が1ミリ程度に制限されている。
【0014】
次に、上記構成の射出成形金型を用いて成形品を成形する成形方法について説明する。
【0015】
可動側金型3に置き中子5を載置し、型締めを行なうと固定側金型2と可動側金型3とで置き中子5の支持台10が挟持され、固定側金型2と可動側金型3とで形成されるキャビティ4内に置き中子5がセットされた状態になる(図1参照)。この状態では固定側金型2及び可動側金型3の成形面2a、3aと置き中子5の成形面5aとの間にはほぼ均一の厚さの空間が形成され、この空間が人形の頭部(成形品)の肉厚を形成するようになっている。
【0016】
このキャビティ4内に成形材料である熱可塑性スチレン系エラストマー(本発明では、SBSやSEBSを使用)をペレットの状態で図示しないホッパーに収容し、ホッパーの下に配置されたスクリューを回転させてホッパー内のペレットを金型に送出すとともにスクリューの周囲をヒーターで加熱してペレットを溶解させ、溶解した状態の成形材料(例えば、SBS)をランナー24からキャビティ4内に加圧注入し、キャビティ4内を溶解したSBSで充填する。
【0017】
SBSが硬化したら型開きを行ない固定側金型2から可動側金型3を後退させる(図4(a)参照)。型開きした状態では置き中子5は可動側金型3に固定された状態なので、突き上げピン25を作動させて、置き中子5を可動側金型3から浮き上がった状態にし(図4(b)参照)、置き中子5を可動側金型3から手で取り外す。
【0018】
取り外した置き中子5は、図5(a)に示すように、人形の頭部となる成形品が被った状態になっているので、ノズル15にエアーガンを突き合わせ、エアーをノズル15から吹き込む。エアーの圧力で、軸体20が押されるが軸体20とともに可動中子12が軸体20の鍔部22が貫通孔14の段部17に当接するまで押し出される(図5(b)参照)。
【0019】
可動中子12が押し出されると嵌合凹部13が逆円錐台状に形成されているので、嵌合凹部13の内周面13aと可動中子12の側部周面12aとの間に隙間が発生し、この隙間からエアーが置き中子5の外部に噴出する。置き中子5の周面は成形品Aが被った状態になっているので、成形品Aの内周面と置き中子5の外周面との間にエアーが吹き込まれ、成形品Aの内側にエアーが充満して成形品Aが膨らむとともに、成形品Aの開口部からエアーが流出するので、成形品Aを簡単に置き中子5から引き抜くことができ、置き中子5からの離型を容易に行なうことができる。
【0020】
上述したように、成形品Aを置き中子5の周面に成形し、成形した成形品Aの内部にエアーを吹き込むことにより成形品Aを置き中子5から容易に取り外すことができるので、従来のローテーション成形やスラッシュ成形に適さない樹脂であっても、中空の成形品を成形することができる。
【0021】
なお、環境に優しい素材であるがSBSやSEBSがペレット状であり、常温では固体であるためローテーション金型に流し込めない、仮にSBSやSEBSを熱溶解させてローテーション金型に流し込み固化させようとしても平均的に固化しない、加熱器で熱溶解したSBSは劣化や変色などのため長期保管が不可能であり、成形性が悪いなどの理由によりローテーション成形に適さないが、SBSやSEBSでアンダーカットの成形品を作る場合は、上記射出成形金型1を用いた射出成形法により、環境に優しい素材であるSBSの成形品を得ることが可能になり、消費者により安全な成形品を提供することができる。
【0022】
【発明の効果】
本発明によれば、ローテーション成形やスラッシュ成形に適さない樹脂であっても、中空の成形品を成形することができる。このことにより、環境に優しい素材であるがローテーション成形やスラッシュ成形に適さない樹脂に対応した射出成形を行なうことができる。
【0023】
また、樹脂としてSBSを使用することができるので、成形した樹脂製品が環境に優しい成形品を作ることができる。
【図面の簡単な説明】
【図1】本発明に係る、アンダーカットの成形品の製造方法に適用される射出成形金型の一例を示す要部断面図
【図2】上記射出成形金型を分解した要部断面図
【図3】(a)〜(c)は置き中子の構成を説明する側面図及び要部断面図
【図4】(a)(b)は型開きして可動側金型から置き中子を浮き上がらせる説明図
【図5】(a)(b)は置き中子からアンダーカットの成形品を離型させる状態の説明図
【符号の説明】
1 射出成形金型
2 固定側金型
3 可動型金型
4 キャビティ
5 置き中子
11 中子本体
12 可動中子
A 成形品
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing an undercut molded product.
[0002]
[Prior art]
Conventionally, when molding the body, head, arms, legs, etc. of a hollow doll, resin is injected into the cavity of a rotation mold or slash mold, and in the case of a rotation mold, the entire mold is rotated. After uniformly forming a resin layer on the inner peripheral surface of the cavity and curing the resin in that state, the molded article is taken out of the rotation mold. In the case of a slush mold, a resin is injected into a heated mold, excess resin that does not adhere to the inside of the mold is poured out, and the adhered resin is reheated and cured to be removed from the slash mold.
[0003]
[Problems to be solved by the invention]
However, PVC (vinyl chloride) is generally used as the resin used in the above-mentioned molding method. However, it has been pointed out by environmental protection groups that this PVC may have a bad effect on the human body. Since it was also used for a doll used as a play object, the emergence of a molded article using an alternative resin was desired.
[0004]
An object of the present invention is to provide a method of manufacturing an undercut molded product which can solve the above-mentioned problems and enables the production of an undercut molded product using an environment-friendly material.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a method for producing an undercut molded product according to the present invention is characterized by having the following requirements.
(B) The placing core is placed in a cavity formed when the fixed mold and the movable mold are arranged so as to be relatively separated from each other. Is substantially similar to the cavity, and a fixed distance is set between the molding surface of the fixed mold and the movable mold and the molding surface of the placing core while being arranged in the cavity. And the resin injected into the cavity is made to have a certain thickness. (C) The placing core is accommodated in a core body and a substantially inverted truncated conical recess formed in the core body. The bottom of the concave portion has an opening at one end of a through-hole penetrating outside the core body, and air is blown into the concave portion through the through-hole to move the movable core into the concave portion. From the inner wall of the recess and the outer wall of the movable core Is flown from the gap to the inside of the molded article, to facilitate release of the molded product from the core placed inflate the molded article [0006]
In addition, if the resin is a thermoplastic styrene-based elastomer and is suitable for injection molding, it is preferable that an undercut molded product can be molded and an environmentally friendly molded product can be produced.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an example of an injection molding die applied to a method of manufacturing an undercut molded product according to the present invention. The injection molding die 1 will be described in the case where the molded product is a doll head. The movable mold 3 is disposed so as to be separable from the fixed mold 2, and is disposed in a cavity 4 formed when the fixed mold 2 and the movable mold 3 are clamped. The fixed core 5 has a fixed distance between the molding surfaces of the fixed mold 2 and the movable mold and the molding surface of the fixed core 5. As described above, the cavity 4 is formed similar to the cavity 4 and slightly smaller, and is formed by the molding surfaces 2a and 3a of the fixed mold 2 and the movable mold 3 and the molding surface 5a of the placing core 5. When a resin is injected, a molded product having a substantially constant thickness is formed.
[0008]
Then, after the resin is cured, the mold is opened, the movable mold 3 is separated from the fixed mold 2, and the placing core 5 with the molded product A covered from the movable mold 3 is removed. The molded product A can be extracted from the core 5.
[0009]
The placing core 5 is composed of a core body 11 and a movable core 12 supported by a support base 10, and has the shape of a doll's head as a whole (see FIG. 3A). The movable core 12 is formed in an inverted truncated conical shape having the same shape as the inverted truncated conical fitting recess 13 formed in the core main body 11 (see FIG. 3B), and formed in the core main body 11. The side surface 12a of the movable core 12 is tightly attached to the inner peripheral surface 13a of the fitting recess 13 at the time of fitting. 12b is formed to be flush with the upper surface 11b of the core body 11 (see FIG. 3C).
[0010]
One end of a through hole 14 penetrating from the bottom surface to the outside of the core body 11 is opened at the bottom surface 13b of the fitting recess 13 of the core body 11, and a nozzle 15 is attached to the other end of the through hole 14. The air blown from the nozzle 15 is blown into the fitting recess 13 from the opening 16 through the through hole 14. In the through hole 14, the diameter of the portion of the support base 10 is slightly increased, and a step 17 is formed.
[0011]
By the way, the shaft body 20 is attached to the movable core 12. The shaft body 20 has a screw portion 21 at the front end and a bulging flange portion 22 at the rear end, and is inserted into the through-hole 14 from the opening 18 on the support base 10 side to be inserted into the through-hole 14. Is screwed into the screw hole 23 of the movable core 12 so that the shaft body 20 is fixed to the movable core 12 so that the shaft body 20 can slide left and right in the through hole 14 in FIG. Has become. The length from the bottom of the movable core 12 to the flange 22 is set so that the sliding amount of the shaft body 20 is about 1 mm. That is, when the movable core 12 is fitted into the fitting recess 13 of the core body 11, the shaft body 20 is set so that the distance between the flange 22 and the step 17 of the through hole 14 is about 1 mm. Is formed, and the upper surface 12b of the lower moving core 12 protrudes from the upper surface 11b of the core body 11 by about 1 mm when the flange portion 22 slides rightward until it contacts the step portion 17. I have.
[0012]
As shown in FIG. 4A, when air is blown from the nozzle 15, the shaft body 20 is pushed forward (to the right in FIG. 4B), and the upper surface 12b of the movable core 12 is Air that protrudes from the upper surface 11b of the main body 11 and forms a gap between the inner peripheral surface 13a of the fitting concave portion 13 and the outer peripheral surface 12a of the movable core 12 is fitted by the air passing through the clearance between the through hole 14 and the shaft body 20. It is arranged to pass through a gap between the recess 13 and the movable core 12 and to squirt out of the core 5.
[0013]
When air is blown from the nozzle 15, the movable core 12 is pushed out, but the swelling portion 22 of the shaft 20 abuts the step 17 of the through hole 14, and the sliding amount of the shaft 20 is limited. The amount of protrusion of the upper surface of the movable core 12 from the upper surface of the core body 11 is limited to about 1 mm.
[0014]
Next, a molding method for molding a molded product using the injection mold having the above-described configuration will be described.
[0015]
When the core 5 is placed on the movable mold 3 and the mold is clamped, the support base 10 of the core 5 is clamped between the fixed mold 2 and the movable mold 3, and the fixed mold 2 is fixed. The core 5 is set in the cavity 4 formed by the metal mold 3 and the movable mold 3 (see FIG. 1). In this state, a space having a substantially uniform thickness is formed between the molding surfaces 2a and 3a of the fixed mold 2 and the movable mold 3 and the molding surface 5a of the placing core 5, and this space is used for the doll. The thickness of the head (molded product) is formed.
[0016]
A thermoplastic styrene-based elastomer (SBS or SEBS is used in the present invention) as a molding material is accommodated in the cavity 4 in a hopper (not shown) in a pellet state, and a screw disposed below the hopper is rotated to rotate the hopper. The pellets inside are sent to a mold and the periphery of the screw is heated by a heater to dissolve the pellets. A molten molding material (for example, SBS) is injected into the cavity 4 from the runner 24 under pressure. The inside is filled with dissolved SBS.
[0017]
When the SBS is cured, the mold is opened, and the movable mold 3 is retracted from the fixed mold 2 (see FIG. 4A). When the mold is opened, the placing core 5 is fixed to the movable mold 3, so that the push-up pin 25 is operated to bring the placing core 5 up from the movable mold 3 (FIG. 4 (b)). )), And remove the placing core 5 from the movable mold 3 by hand.
[0018]
As shown in FIG. 5 (a), the detached core 5 is covered with a molded product serving as the head of the doll, so that an air gun is brought into contact with the nozzle 15 and air is blown from the nozzle 15. The shaft 20 is pushed by the air pressure, but the movable core 12 is pushed out together with the shaft 20 until the flange 22 of the shaft 20 comes into contact with the step 17 of the through hole 14 (see FIG. 5B). .
[0019]
When the movable core 12 is pushed out, the fitting recess 13 is formed in an inverted truncated cone shape, so that a gap is formed between the inner peripheral surface 13 a of the fitting recess 13 and the side peripheral surface 12 a of the movable core 12. Then, air is ejected from the gap to the outside of the core 5. Since the peripheral surface of the placing core 5 is covered with the molded product A, air is blown between the inner peripheral surface of the molded product A and the outer peripheral surface of the placing core 5, and The molded product A expands due to the air, and the air flows out from the opening of the molded product A, so that the molded product A can be easily placed and pulled out from the core 5, and the mold release from the placed core 5 Can be easily performed.
[0020]
As described above, the molded article A can be easily removed from the placed core 5 by placing the molded article A on the peripheral surface of the core 5 and blowing air into the molded article A. Even if the resin is not suitable for conventional rotation molding or slush molding, a hollow molded article can be molded.
[0021]
In addition, although it is an environmentally friendly material, SBS and SEBS are in the form of pellets and are solid at room temperature, so they cannot be poured into a rotation mold. SBS that does not solidify on average, cannot be stored for a long period of time due to deterioration or discoloration due to deterioration or discoloration of the heater, and is not suitable for rotation molding due to poor moldability, but undercut with SBS or SEBS In the case of manufacturing a molded product of the above, it is possible to obtain a molded product of SBS, which is an environmentally friendly material, by an injection molding method using the above-mentioned injection molding die 1, thereby providing a safer molded product to consumers. be able to.
[0022]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even if it is resin which is not suitable for rotation molding or slush molding, a hollow molded article can be shape | molded. This makes it possible to perform injection molding for a resin that is an environmentally friendly material but is not suitable for rotation molding or slush molding.
[0023]
Further, since SBS can be used as the resin, the molded resin product can produce an environmentally friendly molded product.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing an example of an injection molding die applied to a method of manufacturing an undercut molded product according to the present invention. FIG. 2 is a cross-sectional view of a main part of the injection molding die disassembled. FIGS. 3 (a) to 3 (c) are side views and cross-sectional views of main parts for explaining the configuration of the placing core. FIGS. FIG. 5 (a) and FIG. 5 (b) are explanatory diagrams of a state in which an undercut molded product is released from a placing core.
DESCRIPTION OF SYMBOLS 1 Injection mold 2 Fixed side mold 3 Movable mold 4 Cavity 5 Placing core 11 Core body 12 Moving core A Molded product

Claims (2)

以下の要件を備えることを特徴とするアンダーカットの成形品の製造方法。
(イ)互いに相対的に離合するように配置された固定側金型と可動型金型とを型締めしたときに形成されるキャビティ内に置き中子を配置したこと
(ロ)上記置き中子は上記キャビティとほぼ相似状且つ、キャビティ内に配置された状態で上記固定側金型及び可動側金型の成形面と置き中子の成形面との間には一定の間隔が設定されるように形成し、上記キャビティ内に射出された樹脂を一定の肉厚にすること
(ハ)上記置き中子は中子本体と該中子本体に形成された略逆円錐台状の凹部に収容される可動中子とからなり、上記凹部の底部には中子本体の外部に貫通する貫通口の一端を開口させ、該貫通口を介して上記凹部内にエアーを吹き込み、上記可動中子を凹部から浮き上がらせ、吹き込んだエアーを凹部の内壁面と可動中子の外壁面との隙間から成形品の内側に流入させ、該成形品を膨張させて置き中子からの成形品の離型を容易にすること
A method for producing an undercut molded product, comprising the following requirements.
(B) The placing core is placed in a cavity formed when the fixed mold and the movable mold are arranged so as to be relatively separated from each other. Is substantially similar to the cavity, and a fixed distance is set between the molding surface of the fixed mold and the movable mold and the molding surface of the placing core while being arranged in the cavity. And the resin injected into the cavity is made to have a certain thickness. (C) The placing core is accommodated in a core body and a substantially inverted truncated conical recess formed in the core body. The bottom of the concave portion has an opening at one end of a through-hole penetrating outside the core body, and air is blown into the concave portion through the through-hole to move the movable core into the concave portion. From the inner wall of the recess and the outer wall of the movable core Is flown from the gap to the inside of the molded article, to facilitate release of the molded article from the core placed inflate the molded article
前記樹脂が熱可塑性スチレン系エラストマーである、請求項1記載のアンダーカットの成形品の製造方法。The method for producing an undercut molded product according to claim 1, wherein the resin is a thermoplastic styrene-based elastomer.
JP2002185032A 2002-06-25 2002-06-25 Method of manufacturing undercut molded product Pending JP2004025602A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7604475B2 (en) 2005-12-19 2009-10-20 Kanagawaseiki Co., Ltd. Mold apparatus for injection molding
JP2021014046A (en) * 2019-07-11 2021-02-12 キタノ製作株式会社 Molding method and molding die

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115972U (en) * 1973-12-27 1975-09-22
JPS6485718A (en) * 1987-09-29 1989-03-30 Mitsubishi Monsanto Chem Manufacture of molded product made of thermoplastic elastomer resin

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115972U (en) * 1973-12-27 1975-09-22
JPS6485718A (en) * 1987-09-29 1989-03-30 Mitsubishi Monsanto Chem Manufacture of molded product made of thermoplastic elastomer resin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7604475B2 (en) 2005-12-19 2009-10-20 Kanagawaseiki Co., Ltd. Mold apparatus for injection molding
JP2021014046A (en) * 2019-07-11 2021-02-12 キタノ製作株式会社 Molding method and molding die

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