JP2000317968A - Core vent used in foamed resin molding apparatus - Google Patents
Core vent used in foamed resin molding apparatusInfo
- Publication number
- JP2000317968A JP2000317968A JP11127551A JP12755199A JP2000317968A JP 2000317968 A JP2000317968 A JP 2000317968A JP 11127551 A JP11127551 A JP 11127551A JP 12755199 A JP12755199 A JP 12755199A JP 2000317968 A JP2000317968 A JP 2000317968A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- core vent
- columnar body
- end surface
- groove
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は発泡樹脂成形装置に
用いるコアベントに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core vent used in a foamed resin molding apparatus.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】従来
より発泡樹脂成形装置は発泡性熱可塑性樹脂粒子を成形
金型の型窩に充填し、蒸気を加熱媒体として当該粒子を
加熱膨張させて互いに熱融着して成形させるものであ
り、この発泡成形装置に組み付けられる金型に装備させ
る蒸気孔の形成手段としては、コアベントを使用する方
法が一般的である。このコアベントはコストは安価で、
大量生産に適している。金型に組み立てる際のハンドリ
ングも容易であって、常用されているのが現状である。2. Description of the Related Art Conventionally, a foaming resin molding apparatus fills foaming thermoplastic resin particles in a mold cavity of a molding die, and heats and expands the particles by using steam as a heating medium. It is formed by heat fusion, and as a means for forming a steam hole to be provided in a mold assembled to the foam molding apparatus, a method using a core vent is generally used. This core vent is inexpensive,
Suitable for mass production. Handling at the time of assembling into a mold is also easy, and is currently used regularly.
【０００３】コアベントの役割は、充填時のエアーを
逃がし、原料の充填効率を高める。充填不良の防止と充
填時間の短縮をはかる。加熱工程での蒸気の導入と蒸
気を発泡粒内部に入れる為の入り口である。真空冷却
工程での空気の排出とそれによる水分の排出のためであ
る。使用のための取付方法は、材質がアルミ合金からな
る金型に貫通孔を開け、そこに圧入する嵌合方法が一般
的である。The function of the core vent is to release air at the time of filling, thereby increasing the filling efficiency of the raw material. To prevent poor filling and shorten the filling time. This is an entrance for introducing steam in the heating process and for introducing the steam into the inside of the foamed particles. This is for discharging air in the vacuum cooling step and discharging water. As a mounting method for use, a fitting method in which a through hole is formed in a mold made of an aluminum alloy and press-fitted therein is generally used.
【０００４】しかし、通溝１１がキリ孔タイプの図７の
コアベント１０や、スリットタイプの図８の場合のコア
ベント１０の場合にも、金型厚みより全長の短いコアベ
ントでは、図９のごとく金型裏面に冷却水Ｗが溜まり金
型から成形品を取り出した際に、成形品に水が付着する
という欠点があった。その金型裏面に水が溜まるという
欠点を解消すべく実公昭６１−１９４号の考案を先に創
案した。この考案によれば、金型厚みより全長の長い蒸
気孔用の柱状体の一端面を型内面を面一にした時、他端
面側の柱状部が型外面に突出し、その突出した柱状体の
端面および外周との間に隙間を設けた筒状蓋が被着され
ているため水の侵入が防止されるようになっている。し
かし、この考案では２個以上の部品から組み立てられて
おり、その組立コスト、製作コストが高価になり、ま
た、使用中に金型の熱膨張、樹脂の発泡圧力等により、
筒状蓋が分離され、はずれてしまう等の問題点があっ
た。However, in the case of the core vent 10 shown in FIG. 7 in which the through groove 11 is a drilled hole type or the core vent 10 in the case of a slit type shown in FIG. When the cooling water W accumulates on the back surface of the mold and the molded product is taken out from the mold, there is a disadvantage that water adheres to the molded product. The inventor of Japanese Utility Model Publication No. 61-194 was first devised in order to eliminate the disadvantage that water accumulates on the back of the mold. According to this invention, when one end surface of the column for the steam hole having a longer overall length than the mold thickness is made flush with the inner surface of the mold, the columnar portion on the other end side projects to the outer surface of the mold, and Since a cylindrical lid having a gap provided between the end face and the outer periphery is attached, the intrusion of water is prevented. However, in this invention, it is assembled from two or more parts, the assembling cost and the manufacturing cost are high, and the thermal expansion of the mold during the use, the foaming pressure of the resin, etc.
There is a problem that the cylindrical lid is separated and comes off.
【０００５】また、実公平３−１００２７号には側面に
凹溝を形成させた柱状体を金型の通孔に埋めて金型内と
金型外に開口する蒸気通路構造が考案されているが、金
型外側の柱状体端面の凹溝開口部は剥き出しであるか
ら、端面上の水の金型内への侵入は防止されないもので
あり、改良が要望されていた。そこで、本発明において
は、前記従来技術によるコアベントのごとく２個以上の
部品を組み合わせる煩わしさをなくして構造を簡素化さ
せると共に金型裏面に溜まった水を金型内に侵入させな
いようなコアベントの提供を目的として鋭意研究の末、
本発明を完成するに至ったものである。Japanese Utility Model Publication No. 3-002727 has devised a steam passage structure in which a pillar having a concave groove formed on a side surface is buried in a through hole of a mold and opened inside and outside the mold. However, since the opening of the concave groove on the end surface of the columnar body on the outside of the mold is exposed, intrusion of water on the end surface into the mold is not prevented, and improvement has been demanded. Therefore, in the present invention, a core vent that eliminates the inconvenience of combining two or more components as in the core vent according to the prior art, simplifies the structure, and prevents water accumulated on the back surface of the mold from entering the mold. After intensive research for the purpose of providing,
The present invention has been completed.
【０００６】[0006]
【課題を解決するための手段】上記したような目的を達
成することのできる本発明によるコアベントとしては、
請求項１に記載したように、成形用金型の貫通孔に嵌入
させたコアベントとなる柱状体を金型厚みよりも長く形
成してあり、当該柱状体の両端面のうち一端面を金型内
面側に位置させ、他端面を金型外面側から突出して位置
させてあり、一部の側面部は金型外に露出してあり、柱
状体には金型内面側にある一端面から、金型外面側に露
出した側面部へは開通しているが、上記他端面にまで達
しない長さの通溝を形成して金型の内外を連通させてあ
ることを特徴としているものである。The core vent according to the present invention, which can achieve the above objects, includes:
As described in claim 1, the columnar body serving as a core vent fitted into the through hole of the molding die is formed longer than the thickness of the die, and one end surface of both end surfaces of the columnar body is formed by the die. It is located on the inner surface side, the other end surface is positioned so as to protrude from the mold outer surface side, some side surfaces are exposed outside the mold, and the columnar body from one end surface on the mold inner surface side, Although it is open to the side surface exposed on the outer surface of the mold, a through groove having a length not reaching the other end surface is formed to communicate the inside and outside of the mold. .
【０００７】上記請求項１記載のコアベントは、金型の
内外を連通させるための通溝が、金型内面側にある一端
面から、金型外面側に露出した側面部へは開通している
が、他端面にまで達しない長さに形成されているので、
本発明コアベントを使用することにより、金型裏面の水
は型内に侵入せず、成形品の取り出し時に成形品に付着
することなく水濡れの極めて少ない成形品を得ることが
可能となった。コアベントの材質は、真鍮、アルミ合金
等の金属が一般的であるが、劣化や錆びない材質であれ
ば、金属、樹脂を問わない。しかし、樹脂製成形品の発
泡樹脂の付着が見られる場合があるので、発泡樹脂との
付着性のない被覆コート品が好ましい。コアベントの外
径は、金型の形状や通孔を穿設する部位の寸法等によっ
て選ばれ、特に規定されないが一般的に１０mmφ、細か
い部分には５〜８mmφのものが使われる。コアベントの
溝の幅は０．１〜０．５mmである。広い方が上記の流入
量が増え、成形には適しているが、樹脂が挟まり、付着
し、成形品にキズを生ずるため、広すぎてもよくない。
溝の深さは、金型外面側に露出した側面部への開通を要
することから、金型の厚み以上の深さが必要である。一
般には金型厚みが８mmである場合、溝深さは１０mm以上
であり、１０〜２０mm程度が好ましい。何れの場合も、
金型の厚みに応じた溝深さのコアベントを製作し、使用
すればよい。[0007] In the core vent according to the first aspect of the present invention, the passage groove for communicating the inside and outside of the mold is opened from one end face on the mold inner side to the side face exposed on the mold outer side. Is formed to a length that does not reach the other end face,
By using the core vent of the present invention, water on the back surface of the mold does not enter the mold, and it is possible to obtain a molded article having extremely little water wettability without adhering to the molded article when the molded article is taken out. The material of the core vent is generally a metal such as brass or aluminum alloy, but any metal or resin can be used as long as it does not deteriorate or rust. However, since the foamed resin may adhere to the molded resin product, a coated product having no adhesion to the foamed resin is preferable. The outer diameter of the core vent is selected depending on the shape of the mold, the size of the portion where the through hole is formed, and the like, and is not particularly limited, but generally 10 mmφ and 5 to 8 mmφ are used for fine portions. The width of the groove of the core vent is 0.1 to 0.5 mm. A wider one increases the above-mentioned inflow amount and is suitable for molding. However, it is not necessary that the resin is too wide because the resin is pinched and adhered and a molded article is damaged.
The depth of the groove needs to be greater than the thickness of the mold because the groove needs to be opened to the side exposed on the outer surface of the mold. Generally, when the mold thickness is 8 mm, the groove depth is 10 mm or more, preferably about 10 to 20 mm. In either case,
A core vent having a groove depth corresponding to the thickness of the mold may be manufactured and used.
【０００８】[0008]
【発明の実施の形態】次いで、本発明についての実施態
様について図を参照しながら以下に順次説明する。図１
の(a) は本発明によるコアベントとなる柱状体１につい
ての最初の実施形態を示した斜視図であり、同図(b) は
一端面２側から見た側面図、同図(c) は断面図を示して
おり、図２および図３は発泡樹脂成形装置の成形用金型
全体２０にわたる各貫通孔２１に圧入等にて嵌入して取
付けた状態の断面図と、部分断面図を示しており、柱状
体１はコアベント取付部の金型２２の厚みＴよりも長く
形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be sequentially described below with reference to the drawings. FIG.
(A) is a perspective view showing a first embodiment of a columnar body 1 serving as a core vent according to the present invention, (b) is a side view as viewed from one end face 2 side, and (c) is 2 and 3 show a sectional view and a partial sectional view of a state in which each of the through-holes 21 over the entire molding die 20 of the foamed resin molding apparatus is fitted and fitted by press fitting or the like. The columnar body 1 is formed to be longer than the thickness T of the mold 22 of the core vent attachment portion.
【０００９】そして、柱状体１に有する両端面２，３の
うち一端面２は金型２２の内面２３側となるキャビティ
Ｃに面するよう位置させてあり、他端面３は金型２２の
外面２４側から突出して位置させてあり、一部の側面部
５は金型外へ露出されてある。この柱状体１には金型２
２の内外を連通させる通溝４が形成されてあり、この通
溝４としては、金型２２の内面２３側にある一端面２か
ら、金型２２の外面２４側に露出した側面部２５へは開
通しているが、上記他端面３にまで達しない長さに形成
されてあるもので、他端面３には通溝４がなく開溝して
いないことになる。図中３０はキャビティＣ内に成形さ
れる成形体を示している。４０は原料充填器である。One end face 2 of both end faces 2 and 3 of the columnar body 1 is positioned so as to face the cavity C on the inner face 23 side of the mold 22, and the other end face 3 is located on the outer face of the mold 22. It is positioned so as to protrude from the 24 side, and a part of the side surface portion 5 is exposed outside the mold. The column 1 has a mold 2
A groove 4 for communicating the inside and the outside of the mold 2 is formed. The groove 4 extends from the one end surface 2 on the inner surface 23 side of the mold 22 to the side surface 25 exposed on the outer surface 24 side of the mold 22. Is open, but is formed to a length that does not reach the other end surface 3, which means that the other end surface 3 has no passage groove 4 and is not open. In the figure, reference numeral 30 denotes a molded body molded in the cavity C. 40 is a raw material filling device.
【００１０】上記した柱状体１をコアベントとして使用
することによって、水溜まりＷは金型２２の外面２４側
となる柱状体１の他端面３に付着するが、他端面３に通
溝４が形成されていないので、水は金型２２内へ侵入せ
ず、成形品の取出し時に成形品に付着したりすることな
く水濡れの極めて少ない成形品を得ることが可能になっ
た。By using the above-mentioned columnar body 1 as a core vent, the water pool W adheres to the other end surface 3 of the columnar body 1 on the outer surface 24 side of the mold 22, but a through groove 4 is formed in the other end surface 3. As a result, water did not enter into the mold 22, and it was possible to obtain a molded article with extremely little water wettability without adhering to the molded article when taking out the molded article.
【００１１】なお、コアベントとなる柱状体１における
通溝４としては、図４および図５のごとく側面部５から
対向する側面部５へ貫通しきらないもののほか、図６の
ごとく側面部５から対向する側面部５へ貫通すると共に
通溝４が縦横にクロスした形態にして実施することがで
きる。次に具体的な実施例を以下に示すことにする。 〔実施例〕図１に示すような形態で、外径１０mm、全長
１５mmの円柱状で溝幅０．２mm、溝深さ１２mmのスリッ
トを切り込んだ真鍮製のコアベントを製作した。このコ
アベントを成形品寸法が外寸３００×３００mm、肉厚２
０mmとなる、金型厚み８mmの金型に３０mmピッチで取り
付けた（９．８〜９．９mmφの貫通孔を開けてカチコ
ミ）。As the passage groove 4 in the columnar body 1 serving as a core vent, as shown in FIGS. 4 and 5, in addition to the passage groove 4 which does not completely penetrate from the side surface portion 5 to the opposing side surface portion 5, as shown in FIG. The present invention can be implemented by penetrating the opposing side surface portion 5 and crossing the passage groove 4 vertically and horizontally. Next, a specific embodiment will be described below. EXAMPLE A core vent made of brass having a cylindrical shape with an outer diameter of 10 mm and a total length of 15 mm and a groove width of 0.2 mm and a groove depth of 12 mm was cut in the form shown in FIG. The size of this core vent is 300 x 300 mm, and the wall thickness is 2
It was mounted at a pitch of 30 mm on a die having a thickness of 0 mm and a die thickness of 8 mm (a through hole of 9.8 to 9.9 mmφ was opened).
【００１２】この金型を発泡樹脂成形機ＡＣＥ−１２Ｑ
Ｓ（積水工機製）に組み付け、成形を実施した。成形用
発泡樹脂は、発泡性ポリスチレンビーズを予備発泡した
嵩密度が０．０１６g/cm3 で平均粒子径約４mmの発泡粒
子を用いた。成形条件は普通充填で５秒、金型排気２
秒、一方加熱は４秒、逆一方加熱は３秒、両面加熱は
０．７kg/cm2で８秒、水冷５秒、排水４秒、真空放冷は
−５５cmHgで４０秒、トータルサイクルは８２秒であ
り、通常の成形条件を変えることなく成形ができ、密度
０．０１７７g/cm3 の発泡成形体を得た。 従来公知のスリットによる通常タイプによる全長５
mmのコアベントと、従来公知の円柱でキリ孔貫通タイプ
による全長１０mmのコアベントと、本発明の図１による
前記した全長１５mmのコアベントを何れも厚さ８mmの金
型に取付けて発泡成形した場合の成形体についての付着
水分を比較すると、 ＜付着水分＞ 全長 ５mmの通常のコアベント １１．３％（３．６ｇ） 全長１０mmのキリ孔貫通型コアベント ５．６％（１．８ｇ） 全長１５mmの本願発明のコアベント ２．５％（０．８ｇ） 成形して得られた発泡成形体を６０℃の雰囲気下で
乾燥したところ、円柱キリ孔コアベントで成形した場合
４時間かかっていたものが、本願発明のコアベントで成
形た場合１．５時間と大幅に短縮でき、乾燥熱源の蒸気
も６割削減する顕著な改善が得られた。[0012] This mold is used as a foaming resin molding machine ACE-12Q.
S (manufactured by Sekisui Koki) and formed. As the foaming resin for molding, foamed particles obtained by prefoaming expandable polystyrene beads and having a bulk density of 0.016 g / cm 3 and an average particle diameter of about 4 mm were used. Molding condition is 5 seconds for normal filling, mold exhaust 2
Sec, whereas heating is 4 seconds, the reverse one heating 3 seconds, the double-sided heating is 8 seconds 0.7 kg / cm 2, water cooling for 5 seconds, drained 4 seconds, the vacuum cooling is 40 seconds -55CmHg, total cycle 82 Seconds, the molding could be performed without changing the ordinary molding conditions, and a foamed molded article having a density of 0.0177 g / cm 3 was obtained. Total length 5 by conventional type with conventionally known slit
When a core vent having a total length of 10 mm, a core vent having a total length of 10 mm by a conventionally known cylindrical through-hole type, and a core vent having a total length of 15 mm according to FIG. Comparing the moisture content of the molded body, <Moisture content> Normal core vent with a total length of 5 mm 11.3% (3.6 g) Through hole core vent with a total length of 10 mm 5.6% (1.8 g) The core vent of the present invention 2.5% (0.8 g) When the foamed molded product obtained by molding was dried in an atmosphere of 60 ° C., it took 4 hours when molded with a cylindrical drilled core vent. In the case of molding with a core vent, the time was greatly reduced to 1.5 hours, and a remarkable improvement was obtained in that the steam of the drying heat source was also reduced by 60%.
【００１３】[0013]
【発明の効果】本発明によるコアベントは金型外面側に
付着する水分を金型内へ侵入させるのを防止するのに好
適品となり、発泡成形された成形体に対するコアベント
付近からの付着水分を非常に減少させることができ、し
かも単品によるもので、複数部品の組立品のごとく使用
中の分離のおそれが一切なく、組立コストもかからず、
柱状体に通溝形成しただけの簡素なものゆえ、加工コス
トなど製造コスト面でも安価となる利点が大きい。The core vent according to the present invention is suitable for preventing moisture adhering to the outer surface of the mold from entering the mold. It can be reduced to a single item, and there is no risk of separation during use like a multi-part assembly, and there is no assembly cost.
The simple structure in which the groove is formed in the columnar body has a great advantage that the manufacturing cost such as processing cost is low.
【図１】(a) は本発明のコアベントを示す斜視図、(b)
は側面図、(c) 断面図である。1A is a perspective view showing a core vent of the present invention, and FIG.
Is a side view and (c) a sectional view.
【図２】本発明コアベントの使用状態を示す金型全体の
概要断面図である。FIG. 2 is a schematic sectional view of the entire mold showing a use state of the core vent of the present invention.
【図３】図２の一部拡大断面図である。FIG. 3 is a partially enlarged sectional view of FIG. 2;
【図４】(a) は通溝形態の変更例を示す側面図、(b) は
断面図である。4A is a side view showing a modified example of the shape of the passage groove, and FIG. 4B is a cross-sectional view.
【図５】(a) は通溝形態の変更例を示す側面図、(b) は
断面図である。5A is a side view showing a modified example of the shape of the passage groove, and FIG. 5B is a cross-sectional view.
【図６】さらに通溝形態の変更例を示す側面図である。FIG. 6 is a side view showing a modified example of the passage groove form.
【図７】(a) は従来のキリ孔タイプによるコアベントを
示す側面図、(b) は断面図である。FIG. 7 (a) is a side view showing a conventional drilled hole type core vent, and FIG. 7 (b) is a sectional view.
【図８】(a) は従来のスリットタイプによるコアベント
を示す側面図、(b) は断面図である。8 (a) is a side view showing a conventional slit type core vent, and FIG. 8 (b) is a sectional view.
【図９】従来品の使用状態を示す一部拡大断面図であ
る。FIG. 9 is a partially enlarged sectional view showing a use state of a conventional product.
１ コアベントとなる柱状体 ２ 一端面 ３ 他端面 ４ 通溝 ５ 側面部 ２０ 成形用金型の全体 ２１ 貫通孔 ２２ コアベント取付部の金型 ２３ 金型の内面 ２４ 金型の外面 Ｃ キャビティ ３０ 成形体 DESCRIPTION OF SYMBOLS 1 Column-shaped body used as a core vent 2 One end surface 3 The other end surface 4 Through-groove 5 Side surface part 20 The whole molding die 21 Through hole 22 Mold of core vent attachment part 23 Mold inner surface 24 Mold outer surface C cavity 30 Molded body
Claims (1)
トとなる柱状体を金型厚みよりも長く形成してあり、当
該柱状体の両端面のうち一端面を金型内面側に位置さ
せ、他端面を金型外面側から突出して位置させてあり、
一部の側面部は金型外に露出してあり、柱状体には金型
内面側にある一端面から、金型外面側に露出した側面部
へは開通しているが、上記他端面にまで達しない長さの
通溝を形成して金型の内外を連通させてあることを特徴
とする発泡樹脂成形装置に用いるコアベント。1. A column as a core vent fitted into a through hole of a molding die is formed to be longer than the thickness of the die, and one end surface of both end surfaces of the column is located on the inner surface side of the die. And the other end face is positioned so as to protrude from the mold outer surface side,
Some side surfaces are exposed outside the mold, and the columnar body is open from one end surface on the mold inner surface side to the side surface exposed on the mold outer surface side, but is open to the other end surface. A core vent used in a foamed resin molding apparatus, characterized in that a through-groove having a length that does not reach the inside is formed to communicate the inside and outside of a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12755199A JP3592133B2 (en) | 1999-05-07 | 1999-05-07 | Core vent used for foam resin molding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12755199A JP3592133B2 (en) | 1999-05-07 | 1999-05-07 | Core vent used for foam resin molding equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000317968A true JP2000317968A (en) | 2000-11-21 |
| JP3592133B2 JP3592133B2 (en) | 2004-11-24 |
Family
ID=14962816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12755199A Expired - Fee Related JP3592133B2 (en) | 1999-05-07 | 1999-05-07 | Core vent used for foam resin molding equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3592133B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7481637B2 (en) | 2004-05-12 | 2009-01-27 | Woodbridge Foam Corporation | Vented mold and method for producing molded article |
| JP2015160400A (en) * | 2014-02-28 | 2015-09-07 | 有限会社三宝金型製作所 | Foam resin molding die |
| JP2016112811A (en) * | 2014-12-16 | 2016-06-23 | 三興技研株式会社 | Foamed resin molding apparatus |
-
1999
- 1999-05-07 JP JP12755199A patent/JP3592133B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7481637B2 (en) | 2004-05-12 | 2009-01-27 | Woodbridge Foam Corporation | Vented mold and method for producing molded article |
| US7878785B2 (en) | 2004-05-12 | 2011-02-01 | Proprietect L.P. | Vented mold and method for producing molded article |
| JP2015160400A (en) * | 2014-02-28 | 2015-09-07 | 有限会社三宝金型製作所 | Foam resin molding die |
| JP2016112811A (en) * | 2014-12-16 | 2016-06-23 | 三興技研株式会社 | Foamed resin molding apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3592133B2 (en) | 2004-11-24 |
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