JPH07124980A - Tubular thermoplastic foaming resin molded article, forming mold and manufacture thereof - Google Patents
Tubular thermoplastic foaming resin molded article, forming mold and manufacture thereofInfo
- Publication number
- JPH07124980A JPH07124980A JP5272270A JP27227093A JPH07124980A JP H07124980 A JPH07124980 A JP H07124980A JP 5272270 A JP5272270 A JP 5272270A JP 27227093 A JP27227093 A JP 27227093A JP H07124980 A JPH07124980 A JP H07124980A
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- mold
- molding
- tubular
- core
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱可塑性発泡樹脂成形
品およびその製造に用いられる成形用金型、更には前記
成形品の製造方法に関するものであり、更に詳しくは、
例えば図１に示すように長さ方向の全長にわたって連続
する割溝２を有する筒状の熱可塑性発泡樹脂成形品１
を、発泡ビーズ法の型内成形により製造する方法に関す
るものであって、この種の筒状成形品１は、例えば水道
管の凍結防止用チューブ、あるいは空調機器の断熱被覆
チューブ等といった保温保冷材として用いられているも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic foamed resin molded article, a molding die used for producing the same, and a method for producing the molded article.
For example, as shown in FIG. 1, a tubular thermoplastic foamed resin molded product 1 having a split groove 2 continuous over the entire length in the longitudinal direction.
The present invention relates to a method of manufacturing a foamed bead method by in-mold molding of a foamed bead method, and a tubular molded article 1 of this type is a heat insulating material such as a freeze-prevention tube of a water pipe or a heat insulation coating tube of an air conditioner. Is used as.
【０００２】[0002]
【従来の技術】従来、上記のような保温保冷材等として
用いられている筒状成形品１は、ポリプロピレン樹脂や
ポリエチレン樹脂の押出発泡成形法あるいは発泡樹脂シ
ートの真空成形法により製造されていた。前者の押出発
泡成形法は、発泡剤と熱可塑性樹脂原料とを押出機で混
練して筒状に連続的に押出しながら長さ方向に連続する
割溝２を形成し、これを所定の長さに切断するものであ
る。また、後者の真空成形法は、発泡樹脂シートを円筒
状の型内で型内面にそって筒状に真空成形するものであ
る。尚、前記のように押出発泡成形法または真空成形法
によって筒状に成形された成形品１の外面を、更に塩化
ビニル製の外層膜で被覆した製品も製造されている。こ
の外層膜は、この筒状成形品１を割溝２部分を広げて水
道管等に被覆した後に、割溝２を閉じるためののり代と
もなっている。更に、この種の筒状成形品１を製造する
他の方法として、発泡ビーズ法の型内成形により製造す
る方法もある。しかし、この筒状成形品１の場合には、
アンダーカット部を有するため、コア金型とキャビティ
金型からなる成形金型や、あるいは１対のキャビティ金
型からなる成形金型を用いた従来の製造方法では、アン
ダーカット部の抜きが不可能で、筒状のものを一度で成
形することができない。このため、発泡ビーズ法の型内
成形の場合には、例えば図２に示すように筒を半割りに
した１対の半割品１ａ、１ａをそれぞれ別々に成形し、
図３に示すようにこれら２つの半割品１ａ、１ａの一方
の端縁部１ｂ、１ｂ同士を互いにつき合わせて接着して
筒状とするか、あるいは他の方法としては、図４に示す
ように２つの半割品１ａ、１ａがヒンジ部１ｃを介して
連設された形状に成形し、前記ヒンジ部１ｃで折曲して
筒状に形成するしかなかった。2. Description of the Related Art Conventionally, a tubular molded article 1 used as a heat insulating material or a cold insulating material as described above has been manufactured by an extrusion foam molding method of a polypropylene resin or a polyethylene resin or a vacuum molding method of a foamed resin sheet. . In the former extrusion foam molding method, a foaming agent and a thermoplastic resin raw material are kneaded by an extruder to continuously extrude in a cylindrical shape to form a continuous groove 2 in the longitudinal direction, which is formed into a predetermined length. It is to cut into. In the latter vacuum forming method, the foamed resin sheet is vacuum formed into a cylindrical shape along the inner surface of the mold in the cylindrical mold. A product is also manufactured in which the outer surface of the molded product 1 formed into a tubular shape by the extrusion foam molding method or the vacuum molding method as described above is further covered with an outer layer film made of vinyl chloride. This outer layer film also serves as a paste margin for closing the split groove 2 after the tubular molded product 1 is spread over the split groove 2 to cover a water pipe or the like. Further, as another method of manufacturing this type of cylindrical molded product 1, there is a method of manufacturing by in-mold molding of the expanded bead method. However, in the case of this tubular molded product 1,
Since it has an undercut portion, the undercut portion cannot be removed by the conventional manufacturing method using a molding die including a core die and a cavity die, or a molding die including a pair of cavity dies. Therefore, it is not possible to mold a tubular product at once. For this reason, in the case of in-mold molding using the expanded bead method, for example, as shown in FIG. 2, a pair of half-split products 1a and 1a each having a half-split tube are separately molded,
As shown in FIG. 3, one edge portions 1b, 1b of these two half-split products 1a, 1a are brought into contact with each other to form a tubular shape, or as another method, shown in FIG. As described above, the two halves 1a and 1a have to be formed into a shape in which they are connected to each other via the hinge portion 1c, and bent at the hinge portion 1c to form a tubular shape.
【０００３】しかしながら、前記のような押出発泡成形
法の場合には、押し出される成形品は長さ方向の全長に
わたって連続する同一断面形状にしか成形することがで
きず、例えば図５、図６に示すようなフレキシブルチュ
ーブ等の成形品１の場合のように、外面、あるいは中空
内部空間３内面の長さ方向にそって凹凸を有するジャバ
ラ状の成形品等は成形することができない。また、発泡
樹脂シートの真空成形法の場合にも、凹凸があると割溝
が直線状に形成できず、やはり、外面あるいは内面に凹
凸のある成形品を得ることはできない。一方、発泡ビー
ズ法による型内成形の場合には、金型形状を変えるだけ
で成形品外面、あるいは内面に凹凸を自由に形成でき
る。しかし、前記のように従来の型内成形方法では、２
つの半割品１ａを成形してこれをつき合わせて筒状に形
成するしかなかったために、１つの成形品を得るために
２倍の金型面積を必要とし、金型面積当たりにおける成
形品の取り数が少なく、したがって生産性が悪いため、
コスト面で押出発泡成形法等には到底、対抗することは
できず、実質上、この発泡ビーズ法の型内成形により製
造することはできない。However, in the case of the extrusion foam molding method as described above, the extruded molded article can be molded only in the same cross-sectional shape which is continuous over the entire length in the longitudinal direction. For example, as shown in FIGS. As in the case of the molded product 1 such as the flexible tube as shown, a bellows-shaped molded product having irregularities along the length direction of the outer surface or the inner surface of the hollow internal space 3 cannot be molded. Further, even in the vacuum forming method of a foamed resin sheet, if there is unevenness, the split groove cannot be formed in a straight line, and again, a molded product having unevenness on the outer surface or the inner surface cannot be obtained. On the other hand, in the case of in-mold molding by the expanded bead method, irregularities can be freely formed on the outer surface or the inner surface of the molded product simply by changing the shape of the mold. However, as described above, in the conventional in-mold molding method, 2
Since there was no choice but to form one half-molded product 1a and to form this into a cylindrical shape by associating them with each other, a double mold area was required to obtain one molded product. Due to the small number of items taken and therefore poor productivity,
In terms of cost, the extrusion foam molding method and the like cannot be opposed at all, and practically cannot be manufactured by the in-mold molding of the foam bead method.
【０００４】[0004]
【発明が解決しようとする課題】このように、従来で
は、工業的に筒状熱可塑性発泡樹脂成形品を大量生産す
る場合、生産性や、コスト上の問題で押出発泡成形法あ
るいは発泡樹脂シートの真空成形法により製造するしか
なかったが、この押出発泡成形法や発泡樹脂シートの真
空成形法では長さ方向にそって凹凸を有するものは製造
できなかった。As described above, conventionally, in the case of industrially mass-producing tubular thermoplastic foamed resin molded articles, the extrusion foaming molding method or the foamed resin sheet is used because of problems in productivity and cost. However, the extrusion foam molding method and the vacuum molding method of a foamed resin sheet could not manufacture a product having irregularities along the length direction.
【０００５】そこで本発明は上記の点に鑑み、配管保温
保冷材のような長さ方向にわたって割溝を有する筒状成
形品を、熱可塑性樹脂の発泡ビーズ法による型内成形で
製造するに際し、一度の成形で筒状の一体成形品を得る
ことを可能として生産性を向上させることにより、コス
ト面でも他の押出発泡成形法や発泡樹脂シートの真空成
形法等に対抗しうるだけでなく、これらの押出発泡成形
法や発泡樹シートの真空成形では不可能であった長さ方
向に凹凸を有する成形品をも製造可能とすることを目的
とするものである。In view of the above points, the present invention provides a method for producing a tubular molded article having a split groove in the lengthwise direction, such as a pipe heat insulation material, by in-mold molding of a thermoplastic resin foam bead method. By improving productivity by making it possible to obtain a tubular integrally molded product by molding once, not only can it be opposed to other extrusion foam molding methods and vacuum molding methods of foamed resin sheets in terms of cost, but also It is an object of the present invention to make it possible to produce a molded product having irregularities in the length direction, which was impossible by these extrusion foam molding methods and vacuum molding of foamed resin sheets.
【０００６】[0006]
【課題を解決するための手段】このような本発明の第１
は、熱可塑性発泡樹脂の発泡ビーズ法により型内で一体
成形してなり、長さ方向全長にわたって連続する割溝を
形成してなる筒状熱可塑性発泡樹脂成形品にある。そし
て、この本発明にかかる筒状熱可塑性発泡樹脂成形品に
おいては、その外面または内面の少なくとも一方の長さ
方向にそって凹凸を形成したものも得られる。特に、内
面の長さ方向に凹凸を形成したものを得ることもできる
が、この場合には使用する熱可塑性発泡樹脂としては、
ポリオレフィンが好ましい。更に、本発明では、前記筒
状成形品の割溝の互いに対面する端面に互いに嵌合係止
する係止部を形成してなる筒状熱可塑性発泡樹脂成形品
をも提供している。The first aspect of the present invention as described above
Is a tubular thermoplastic foamed resin molded product which is integrally molded in a mold by a foamed bead method of a thermoplastic foamed resin and has a continuous groove formed over the entire length in the length direction. The tubular thermoplastic foamed resin molded product according to the present invention can also be obtained by forming irregularities along the length direction of at least one of the outer surface and the inner surface thereof. In particular, it is also possible to obtain those having irregularities formed in the length direction of the inner surface, but in this case, as the thermoplastic foam resin to be used,
Polyolefins are preferred. Further, according to the present invention, there is also provided a tubular thermoplastic foamed resin article formed by forming engaging portions for engaging and engaging with each other on end surfaces of the split groove of the tubular article which face each other.
【０００７】本発明の第２は、前記のような筒状熱可塑
性発泡樹脂成形品を製造するための成形用金型であり、
この金型は、筒状成形品の外面形状を形成する一対のキ
ャビティ金型内に、前記両キャビティ金型によって形成
される成形空間の長さ方向全長にわたって筒状成形品の
中空内部空間およびこの内部空間から外部に連通する割
溝を形成する中子型を前記両キャビティ金型に対して離
合自在に設けてなるものである。この場合、前記中子型
は、一方のキャビティ金型に押出手段により離合自在に
設けることができる。更に、この場合に、該中子型から
成形品を離型させる離型手段を設けることができる。A second aspect of the present invention is a molding die for producing the above-mentioned tubular thermoplastic foamed resin molded article,
This mold comprises a pair of cavity molds forming the outer surface shape of a tubular molded product, a hollow inner space of the cylindrical molded product and a hollow internal space of the cylindrical molded product over the entire length in the longitudinal direction of the molding space formed by the two cavity molds. A core die for forming a split groove that communicates from the inner space to the outside is provided so as to be separable from the cavity dies. In this case, the core mold can be detachably provided in one of the cavity molds by an extrusion means. Further, in this case, it is possible to provide a releasing means for releasing the molded product from the core die.
【０００８】本発明の第３は、前記のような筒状熱可塑
性発泡樹脂成形品を製造するためのもう１つの成形用金
型であり、これは筒状成形品の外面形状を形成する一対
のキャビティ金型の一方に、前記両キャビティ金型によ
って形成される成形空間の長さ方向全長にわたって筒状
成形品の内部空間から外部に連通する割溝を形成する凸
条を一体に設けるとともに、前記凸状部分に筒状成形品
の中空内部空間を形成する中子型を離合自在に設けてな
るものである。この場合に、前記中子型を前記凸条を設
けたキャビティ金型から押出手段により離合自在に設け
ることができる。更に、前記の場合に、中子型に該中子
型から成形品を離型させる離型手段を設けることができ
る。A third aspect of the present invention is another molding die for producing the above-mentioned tubular thermoplastic foamed resin molded product, which comprises a pair of outer surface shapes of the tubular molded product. One of the cavity molds is integrally provided with a ridge that forms a split groove that communicates from the inner space of the cylindrical molded product to the outside over the entire length in the length direction of the molding space formed by the cavity molds, A core mold that forms a hollow internal space of a tubular molded product is provided in the convex portion so as to be separable. In this case, the core die can be detachably provided from the cavity die provided with the convex strip by the extruding means. Further, in the above case, the core mold may be provided with a mold releasing means for releasing the molded product from the core mold.
【０００９】また、本発明の第４は、前記のような筒状
熱可塑性発泡樹脂成形品を製造するための更に別の成形
用金型に関するものであって、これは、筒状成形品の外
面形状を形成する一対のキャビティ金型の一方に、前記
両キャビティ金型によって形成される成形空間の長さ方
向全長にわたって筒状成形品の中空内部空間およびこの
内部空間から外部に連通する割溝を形成する中子型を一
体に設け、該中子型に成形品を離型させる離型手段を設
けてなるものである。A fourth aspect of the present invention relates to yet another molding die for producing the above-mentioned tubular thermoplastic foamed resin molded article, which is the same as that of the tubular molded article. In one of the pair of cavity molds forming the outer surface shape, a hollow internal space of the cylindrical molded product and a split groove communicating from the internal space to the outside over the entire length in the length direction of the molding space formed by the cavity molds. Is integrally provided with a core die for forming a molded product, and mold release means for releasing a molded product from the core die is provided.
【００１０】本発明の第５は、前記のような筒状の熱可
塑性発泡樹脂成形品を製造する方法であって、筒状成形
品の外面形状を形成する一対のキャビティ金型の一方
に、前記両キャビティ金型によって形成される成形空間
の長さ方向全長にわたって筒状成形品の中空内部空間お
よびこの内部空間から外部に連通する割溝を形成する中
子型を離合自在に設けて長さ方向全長にわたって連続す
る割溝を有する筒状の成形空間を形成してなる成形用金
型の前記成形空間に、原料粒子を充填し、この成形用金
型を加熱して前記成形空間内の原料粒子を発泡させると
ともに互いに発泡融着させて長さ方向に全長にわたって
割溝を有する筒状成形品を型内成形した後、金型を冷却
し、次いで両キャビティ金型を開放するとともに、前記
成形品を中子型とともにキャビティ金型から取り出し、
更にこの中子型から成形品を離型させることを特徴とす
るものである。A fifth aspect of the present invention is a method for producing the above-mentioned tubular thermoplastic foamed resin molded article, wherein one of a pair of cavity molds forming the outer surface shape of the tubular molded article is provided. A hollow inner space of the cylindrical molded product and a core mold for forming a split groove communicating from the inner space to the outside are provided so as to be separable over the entire length in the length direction of the molding space formed by the two cavity dies. The raw material in the molding space is filled with raw material particles in the molding space of a molding die formed by forming a cylindrical molding space having continuous split grooves over the entire length in the direction, and heating the molding die. After in-molding a cylindrical molded product having a split groove over the entire length in the length direction by foaming particles and foam-fusing with each other, the mold is cooled, then both cavity molds are opened, and the molding is performed as described above. The product is a core type To the take-out from the cavity mold,
Further, it is characterized in that the molded product is released from the core mold.
【００１１】本発明の第６は、前記と同じく筒状の熱可
塑性発泡樹脂成形品を製造する方法であるが、この方法
では、筒状成形品の外面形状を形成する一対のキャビテ
ィ金型の一方に、前記両キャビティ金型によって形成さ
れる成形空間の長さ方向全長にわたって筒状成形品の割
溝を形成する凸条を設け、前記凸条部分に筒状成形品の
中空内部空間を形成する中子型を離合自在に設けて長さ
方向全長にわたって連続する割溝を有する筒状の成形空
間を形成してなる成形用金型の前記成形空間に、原料粒
子を充填し、この成形用金型を加熱して前記成形空間内
の原料粒子を発泡させるとともに互いに発泡融着させて
長さ方向に全長にわたって割溝を有する筒状成形品を型
内成形した後、金型を冷却し、次いで両キャビティ金型
を開放するとともに、前記成形品を中子型とともに前記
一方のキャビティ金型から取り出し、更にこの中子型か
ら成形品を離型させることを特徴とするものである。A sixth aspect of the present invention is a method for producing a tubular thermoplastic foamed resin molded article as described above. In this method, a pair of cavity molds for forming the outer surface shape of the tubular molded article is formed. On one side, a ridge for forming a split groove of the tubular molded product is provided over the entire length in the length direction of the molding space formed by the cavity molds, and a hollow internal space of the tubular molded product is formed in the ridge portion. A core mold is formed so as to be separable so as to form a cylindrical molding space having a continuous groove over the entire length in the longitudinal direction. After heating the mold to foam the raw material particles in the molding space and foam-fuse with each other to form a tubular molded product having a split groove over the entire length in the longitudinal direction, and then cooling the mold, Then open both cavity molds The molded article was removed from the one cavity mold with core type, characterized in that to further release the molded article from the core mold.
【００１２】そして、本発明の第７は、同じく筒状熱可
塑性発泡樹脂成形品を製造する方法に関するものであ
り、この方法では、筒状成形品の外面形状を形成する一
対のキャビティ金型の一方に、前記両キャビティ金型に
よって形成される成形空間の長さ方向全長にわたって筒
状成形品の中空内部空間およびこの内部空間から外部に
連通する割溝を形成する中子型を一体に設けて長さ方向
全長にわたって連続する割溝を有する筒状の成形空間を
形成してなる成形用金型の前記成形空間に、原料粒子を
充填し、この成形用金型を加熱して前記成形空間内の原
料粒子を発泡させるとともに互いに発泡融着させて長さ
方向の全長にわたって割溝を有する筒状成形品を型内成
形した後、金型を冷却し、次いで両キャビティ金型を開
放するとともに、前記一方のキャビティ金型およびこれ
に一体に設けられた中子型から成形品を離型させるもの
である。この方法を用いる場合には、熱可塑性発泡樹脂
としては、ポリオレフィンが特に好ましい。A seventh aspect of the present invention also relates to a method of manufacturing a tubular thermoplastic foamed resin molded product, in which a pair of cavity molds for forming the outer surface shape of the tubular molded product is formed. On the other hand, a core mold for integrally forming a hollow internal space of the cylindrical molded product and a split groove communicating from the internal space to the outside is integrally provided over the entire length in the length direction of the molding space formed by the two cavity molds. In the molding space, a raw material particle is filled in the molding space of a molding die formed by forming a cylindrical molding space having continuous split grooves over the entire length, and the molding die is heated to generate the inside of the molding space. After in-molding a cylindrical molded product having split grooves over the entire length in the longitudinal direction by foaming and fusing the raw material particles with each other, cooling the mold, and then opening both cavity molds, Previous One cavity mold and thereto is intended to release the molded product from the core die provided integrally. When this method is used, polyolefin is particularly preferable as the thermoplastic foam resin.
【００１３】[0013]
【作用】上記のような本発明による筒状熱可塑性樹脂成
形品の製造においては、筒状成形品の外面形状を形成す
る一対のキャビティ金型と、前記両キャビティ金型によ
って形成される成形空間の長さ方向全長にわたって筒状
成形品の中空内部空間を形成する中子型とにより、長さ
方向全長にわたって連続する割溝を有する筒状の成形空
間を形成してなる成形用金型を用い、前記成形空間に、
必要に応じて予備発泡した原料粒子を充填し、この成形
用金型を蒸気等により加熱して前記成形空間内の原料粒
子を発泡させるとともに互いに発泡融着させた後、金型
を冷却して成形空間内の成形品を冷却させることで、長
さ方向に全長にわたって割溝を有する筒状成形品が型内
で一体に成形される。こうして筒状成形品を型内成形し
た後、両キャビティ金型を開放するとともに、中子型を
キャビティ金型に対して離合自在に設けた場合には、中
空内部空間に中子型が入ったままの状態で前記成形品を
中子型とともにキャビティ金型から取り出す。そして、
この中子型とともにキャビティ金型から取り出された成
形品を中子型から離型させることで、筒状成形品を得る
ことができる。また、中子型を一方のキャビティ金型に
一体に設けたものでは、キャビティ金型を開放したの
ち、前記中子型を設けてなる一方のキャビティ金型に残
った成形品を金型から離型することで筒状の成形品を得
ることができる。In the production of the tubular thermoplastic resin molded product according to the present invention as described above, a pair of cavity molds forming the outer surface shape of the cylindrical molded product and a molding space formed by the both cavity molds. Using a molding die that forms a cylindrical molding space having a continuous groove along the entire length in the length direction by a core mold that forms the hollow inner space of the cylindrical molded product over the entire length in the length direction. , In the molding space,
If necessary, pre-expanded raw material particles are filled, and the molding die is heated by steam or the like to foam the raw material particles in the molding space and foam-melt-bond each other, and then the mold is cooled. By cooling the molded product in the molding space, a cylindrical molded product having a split groove over the entire length in the length direction is integrally molded in the mold. After in-molding the tubular molded product in this way, both cavity molds were opened, and when the core mold was provided so as to be separable from the cavity mold, the core mold entered the hollow internal space. In the state as it is, the molded product is taken out from the cavity mold together with the core mold. And
A tubular molded product can be obtained by releasing the molded product taken out of the cavity mold together with the core mold from the core mold. Further, in the case where the core mold is integrally provided in one of the cavity molds, after the cavity mold is opened, the molded product remaining in the one cavity mold provided with the core mold is separated from the mold. A tubular molded product can be obtained by molding.
【００１４】[0014]
【実施例】次に添付図面に基づいて本発明を更に詳細に
説明する。The present invention will be described in more detail with reference to the accompanying drawings.
【００１５】図７は本発明により筒状熱可塑性発泡樹脂
成形品を製造するための成形用金型の１例を示すもので
ある。この成形用金型は、筒状成形品１の外面形状を形
成する１対のキャビティ金型１１、１２、並びに筒状成
形品１の中空内部空間３を形成する中子型２１とからな
る。この両キャビティ金型１１、１２、および中子型２
１から形成される筒状成形品の成形空間２０の大きさは
特に制限はないが、一般的な保温保冷材用筒状製品の場
合には、外径が５０〜１００ｍｍ、肉厚は５〜２０ｍｍ
程度であり、また、長さは１．５〜２ｍ程度である。前
記両キャビティ金型１１、１２のそれぞれの背面側には
蒸気室１３、１４が設けられており、両蒸気室１３、１
４にはそれぞれ蒸気管１５、１６、および、ドレン１
７、１８が連通連結されている。また、前記一方のキャ
ビティ金型１１には原料充填フィーダ１９が両キャビテ
ィ金型１１、１２によって形成される成形空間２０に連
通した状態で設けられている。FIG. 7 shows an example of a molding die for producing a tubular thermoplastic foamed resin molded product according to the present invention. This molding die includes a pair of cavity molds 11 and 12 that form the outer surface shape of the tubular molded product 1, and a core mold 21 that forms the hollow internal space 3 of the tubular molded product 1. Both cavity molds 11 and 12 and core mold 2
The size of the molding space 20 of the tubular molded product formed from No. 1 is not particularly limited, but in the case of a general tubular product for heat insulation materials, the outer diameter is 50 to 100 mm and the wall thickness is 5 to 5. 20 mm
The length is about 1.5 to 2 m. Steam chambers 13 and 14 are provided on the back sides of the cavity molds 11 and 12, respectively.
4 are steam pipes 15 and 16 and drain 1 respectively.
7, 18 are communicated and connected. A raw material filling feeder 19 is provided in the one cavity mold 11 in a state of communicating with a molding space 20 formed by the two cavity molds 11 and 12.
【００１６】一方、他方のキャビティ金型１２には、図
７および図８に示すように、前記両キャビティ金型１
１、１２によって形成される成形空間２０の長さ方向の
全長にわたって、筒状成形品１の中空内部空間３を形成
する膨出部２１ａと、この膨出部２１ａの外面から突設
され、筒状成形品１の割溝２を形成する凸条部２１ｂと
からなる中子型２１が、押出手段としてのエアシリンダ
２２によってキャビティ金型１２に対して離合自在に設
けられている。前記エアシリンダ２２は、一方のキャビ
ティ金型１２、およびその背面の蒸気室１４を貫通して
設けられており、成形空間２０の長さ方向にそって所定
の間隔で複数設けられて設けられるが、その数は、前記
のように成形品１の長さが１．５〜２ｍ程度であれば３
０ｃｍ間隔程度で設ければよい。更に、前記中子型２１
には、図７および図９に示すように、離型手段としての
エジェクトピン２３が該中子型２１から出没自在に設け
られている。このエジェクトピン２３は、中子型２１の
膨出部２１ａの先端から出没するものであり、中子型２
１の膨出部２１ａ、凸条部２１ｂ、およびキャビティ金
型１２、更にはその背面の蒸気室１４を貫通して設けら
れており、図例の如く前記エアシリンダ２２と同様に成
形空間２０の長さ方向にそって所定の間隔で複数設けら
れている。On the other hand, in the other cavity mold 12, as shown in FIGS.
The bulging portion 21a forming the hollow internal space 3 of the tubular molded product 1 and the bulging portion 21a protruding from the outer surface of the bulging portion 21a are provided over the entire length in the length direction of the molding space 20 formed by 1 and 12. A core mold 21 including a ridge 21b forming the split groove 2 of the molded article 1 is provided so as to be separable from the cavity mold 12 by an air cylinder 22 as an extruding means. The air cylinders 22 are provided so as to penetrate the cavity die 12 on one side and the steam chamber 14 on the back side thereof, and are provided at a predetermined interval along the length direction of the molding space 20. , The number is 3 if the length of the molded product 1 is about 1.5 to 2 m as described above.
It may be provided at intervals of 0 cm. Further, the core type 21
As shown in FIG. 7 and FIG. 9, an eject pin 23 as a mold releasing means is provided so as to be retractable from the core mold 21. The eject pin 23 protrudes and retracts from the tip of the bulging portion 21 a of the core die 21.
It is provided so as to penetrate through the bulging portion 21a, the ridge portion 21b, the cavity mold 12, and the steam chamber 14 on the back surface thereof, and as in the illustrated example, the molding space 20 of the molding space 20 is formed. A plurality of them are provided at predetermined intervals along the length direction.
【００１７】次に、上記のような成形用金型を用いて筒
状の熱可塑性発泡樹脂成形品を発泡ビーズ法の型内成形
で製造する方法を説明する。先ず、図７に示すように必
要に応じて予め予備発泡した熱可塑性樹脂の原料粒子
を、原料充填フィーダ１９から空気送給によって前記１
対のキャビティ金型１１、１２および中子型２１から構
成される筒状の成形空間２０内に充填する。次に、両キ
ャビティ金型１１、１２の背面側に設けられた蒸気室１
３、１４へ蒸気管１５、１６から高温の蒸気を導入して
キャビティ金型１１、１２を加熱することで、前記成形
空間２０内に充填された原料粒子を二次発泡させるとと
もに、原料粒子同士を互いに発泡融着させて長さ方向の
全長にわたって割溝２を有する筒状成形品を型内成形す
る。その後、ドレン１７、１８を開放して蒸気室１３、
１４から蒸気を排出したうえで、今度は蒸気管１５、１
６から蒸気室１３、１４内に冷却水を導入してキャビテ
ィ金型１１、１２を冷却する。尚、この金型の冷却に際
しては、前記のように冷却水を用いる代わりに、ブロア
ーまたはポンプ等を用いた風冷等の種々の手段を用いる
ことができる。また、前記の場合には、予め予備発泡し
た原料粒子を金型内で二次発泡させているが、予備発泡
させない原料粒子を用いることもある。Next, a method for producing a tubular thermoplastic foamed resin molded article by in-mold molding by the foaming bead method using the above molding die will be described. First, as shown in FIG. 7, the raw material particles of the thermoplastic resin which have been pre-foamed in advance as necessary are fed from the raw material filling feeder 19 by air feeding as described above.
A cylindrical molding space 20 composed of a pair of cavity molds 11 and 12 and a core mold 21 is filled. Next, the steam chamber 1 provided on the back side of both cavity molds 11 and 12
By introducing high-temperature steam from the steam pipes 15 and 16 to the cavity molds 3 and 14 to heat the cavity molds 11 and 12, the raw material particles filled in the molding space 20 are secondarily foamed and the raw material particles are Are foam-fused to each other, and a cylindrical molded product having the split groove 2 over the entire length in the longitudinal direction is molded in the mold. After that, the drains 17, 18 are opened and the steam chamber 13,
After exhausting steam from 14, the steam pipes 15 and 1
Cooling water is introduced into the steam chambers 13 and 14 from 6 to cool the cavity molds 11 and 12. When cooling the mold, various means such as air cooling using a blower or a pump can be used instead of using the cooling water as described above. Further, in the above case, the pre-expanded raw material particles are secondarily expanded in the mold, but the raw material particles which are not pre-expanded may be used.
【００１８】上記のように、キャビティ金型１１、１２
内で原料粒子を加熱発泡、および冷却して筒状成形品を
成形した後、図１０および図１１に示すように、キャビ
ティ金型１１、１２を開くとともに、押出手段としての
エアシリンダ２２・・・を用いて成形品１を中子型２１
とともにキャビティ金型１２から取り出す。このとき、
離型手段としての前記エジェクトピン２３・・・も中子
型２１とともにキャビティ金型１２から突出する。更
に、この中子型２１とともにキャビティ金型１２から取
り出された筒状成形品１は、図１２、図１３に示すよう
に、前記エジェクトピン２３・・・を中子型２１先端か
ら更に突出させることで、図１３に想像線で示すように
筒状成形品１の割溝２が両側に広がって中子型２１の膨
出部２１ａが筒状成形品１の中空内部空間３から抜け出
して筒状成形品１が中子型２１から離型する。この離型
した筒状成形品１は、適宜成形用金型の下方に落下す
る。こキャビティ金型１２から中子型２１とともに取り
出された成形品１を中子型２１から離型させる場合に、
前記のように中子型２１から更にエジェクトピン２３を
突出させる代わりに、エジェクトピン２３をその位置で
固定しておく一方で、エアシリンダ２２により中子型２
１側をキャビティ金型１２方向に再び引き戻すことでも
成形品１を中子型２１から離型させることができる。As described above, the cavity molds 11 and 12
After the raw material particles are heated and foamed inside and cooled to form a cylindrical molded article, as shown in FIGS. 10 and 11, the cavity molds 11 and 12 are opened and the air cylinder 22 ...・ Mold the molded product 1 using
At the same time, it is taken out from the cavity mold 12. At this time,
The eject pins 23 ... As mold releasing means also protrude from the cavity mold 12 together with the core mold 21. Further, in the tubular molded product 1 taken out from the cavity mold 12 together with the core mold 21, as shown in FIGS. 12 and 13, the eject pins 23 ... Are further projected from the tip of the core mold 21. As a result, as shown by the phantom line in FIG. 13, the split groove 2 of the tubular molded product 1 spreads to both sides, and the bulging portion 21a of the core die 21 comes out of the hollow internal space 3 of the tubular molded product 1 to form a tubular shape. The molded article 1 is released from the core mold 21. The tubular molded product 1 that has been released falls appropriately below the molding die. When the molded product 1 taken out from the cavity mold 12 together with the core mold 21 is released from the core mold 21,
Instead of further ejecting the eject pin 23 from the core die 21 as described above, the eject pin 23 is fixed at that position while the core die 2 is fixed by the air cylinder 22.
The molded product 1 can be released from the core mold 21 also by pulling back the side 1 toward the cavity mold 12.
【００１９】尚、図面に示した成形用金型には、筒状成
形品１表面の凹凸は形成されないが、キャビティ金型１
１、１２の内面、あるいは中子型２１の膨出部２１ａの
外面に凹凸を形成しておくだけで、例えば図５、図６に
示したような、筒状成形品１の外面あるいは中空内部空
間３内面に長さ方向にそって凹凸を有する筒状成形品１
を簡単に製造することができるのである。In the molding die shown in the drawing, no irregularities are formed on the surface of the cylindrical molded product 1, but the cavity mold 1 is formed.
The outer surface or hollow interior of the tubular molded article 1 as shown in FIGS. 5 and 6, for example, can be obtained by simply forming irregularities on the inner surfaces of 1 and 12 or the outer surface of the bulging portion 21a of the core mold 21. Cylindrical molded article 1 having irregularities along the length direction on the inner surface of the space 3
Can be easily manufactured.
【００２０】また、前記の場合には、中子型２１から成
形品１を離型させるに際して、成形品１をエジェクトピ
ン２３により中子型２１から押し出して割溝２を広げる
ようにして離型させている。しかし、成形品１の内面に
長さ方向にわたって凹凸を形成しない場合には、図１４
に示すように中子型２１から長さ方向に成形品１を引き
抜くようにして離型させる方法を採用することもでき
る。In the above case, when the molded product 1 is released from the core mold 21, the molded product 1 is pushed out from the core mold 21 by the eject pin 23 so that the split groove 2 is widened. I am letting you. However, in the case where unevenness is not formed on the inner surface of the molded product 1 in the length direction,
It is also possible to employ a method of releasing the molded product 1 from the core mold 21 in the lengthwise direction as shown in FIG.
【００２１】更に、例えば図１５〜図１７に示すよう
に、中子型２１における凸条部２１ｂの両側面に互いに
対応する凹凸を形成しておけば、この金型によって成形
される筒状成形品１における割溝２の互いに対面する端
面２ａ、２ｂのそれぞれに、互いに係合する係合部２
ｃ、２ｄを形成することができる。このように、割溝２
部分に係合部２ｃ、２ｄを形成したものでは、例えばこ
の筒状成形品１を凍結防止チューブとして水道管等に外
嵌して取り付けた場合に、前記両係合部２ｃ、２ｄを互
いに係合することで割溝２部分を閉じることができるの
である。Further, for example, as shown in FIGS. 15 to 17, if concave and convex portions corresponding to each other are formed on both side surfaces of the convex ridge portion 21b of the core die 21, a tubular molding is performed by this die. Engaging portion 2 engaging with each of end surfaces 2a, 2b of split groove 2 facing each other in product 1
c, 2d can be formed. In this way, the split groove 2
In the case where the engaging portions 2c and 2d are formed in the portions, for example, when the tubular molded article 1 is externally fitted and attached to a water pipe or the like as an antifreezing tube, the engaging portions 2c and 2d are engaged with each other. By joining, the split groove 2 portion can be closed.
【００２２】また、本発明によって筒状熱可塑性発泡樹
脂成形品を製造する場合の樹脂としては、発泡ポリエチ
レン、発泡ポリプロピレン等の発泡ポリオレフィン、あ
るいは発泡ポリスチレン樹脂等の各種の発泡合成樹脂原
料を用いることができるが、前記図１３に示したように
割溝２部分を左右に開いて中子型２１から成形品１を離
型する方法の場合には、これらの発泡合成樹脂の中で
も、発泡ポリエチレン、発泡ポリプロピレン等の発泡ポ
リオレフィンを用いれば、成形品が比較的柔軟性に富ん
でいることから、成形品１が破損するおそれがなく、好
ましい樹脂であるということができる。尚、図１４に示
すように、中子型２１から長さ方向に成形品１を抜き取
るように離型する方法の場合には、発泡ポリスチレンの
ような比較的硬い樹脂でも一向に差し支えない。As the resin for producing the tubular thermoplastic foamed resin molded article according to the present invention, various foamed synthetic resin raw materials such as foamed polyolefin such as foamed polyethylene and polypropylene, or foamed polystyrene resin are used. However, in the case of the method of releasing the molded product 1 from the core mold 21 by opening the split groove 2 portion to the left and right as shown in FIG. 13, among these foamed synthetic resins, foamed polyethylene, When a foamed polyolefin such as foamed polypropylene is used, the molded product is relatively flexible, so that the molded product 1 is not likely to be damaged and can be said to be a preferable resin. Incidentally, as shown in FIG. 14, in the case of a method of releasing the molded product 1 from the core mold 21 so as to pull out the molded product 1 in the longitudinal direction, a relatively hard resin such as expanded polystyrene can be used.
【００２３】更に、上記の実施例では、成形品１を中子
型２１とともにキャビティ金型１２から取り出す押出手
段としてエアシリンダ２２を用いているが、この押出手
段は離型手段と同様のエジェクトピン２３のようなもの
であってもよいし、また、中子型２１から成形品１を離
型させる離型手段についても、前記のようなエジェクト
ピン２３でなく、圧縮空気による離型方法等を採用する
こともできる。更には、キャビティ金型１２から中子型
２１を貫通して２段に伸びるエアシリンダ等の押出手段
を設けておき、この押出手段による第１段目の押出操作
によって成形品１を中子型２１とともにキャビティ金型
１２から取り出した後、該押出装置の第２段目の押出操
作によって中子型２１から成形品１を離型させるように
すれば、押出装置と離型装置とを１つで兼用させること
も可能である。Further, in the above embodiment, the air cylinder 22 is used as the extruding means for taking out the molded product 1 together with the core die 21 from the cavity die 12, but this extruding means is the same as the eject pin. 23 may be used, and the releasing means for releasing the molded product 1 from the core die 21 may be a releasing method using compressed air instead of the eject pin 23 as described above. It can also be adopted. Further, an extruding means such as an air cylinder that extends from the cavity die 12 through the core die 21 in two steps is provided, and the molded product 1 is made into the core die by the extruding operation of the first step by the extruding means. When the molded product 1 is released from the core die 21 by the second stage extrusion operation of the extrusion device after taking it out from the cavity mold 12 together with 21, the extrusion device and the release device are combined into one. It is also possible to combine the two.
【００２４】次に、図１８および図１９に示すものは、
本発明により筒状熱熱可塑性樹脂成形品を製造するため
の成形用金型の他実施例を示すものである。ここでは、
筒状成形品１の割溝２を形成する凸条部２１ｂを前記の
ように中子型２１に設けるではなく、キャビティ金型１
２側に一体に設けてなるものであって、このキャビティ
金型１２に設けた凸条部２１ｂに対して中子型２１をエ
アシリンダ２２等の押出手段によって離合自在に設ける
とともに、該中子型２１を貫通して離型手段としてのエ
ジェクトピン２３を設けてなるものである。Next, as shown in FIGS. 18 and 19,
2 shows another embodiment of a molding die for producing a tubular thermoplastic resin molded product according to the present invention. here,
The cavity 21 is not provided with the ridge 21b forming the split groove 2 of the tubular molded product 1 on the core mold 21 as described above.
The core die 21 is integrally provided on the second side, and the core die 21 is detachably attached to the protrusion 21b provided on the cavity die 12 by an extruding means such as an air cylinder 22. An eject pin 23 as a releasing means is provided so as to penetrate the die 21.
【００２５】この成形用金型によっても前記の場合と全
く同様に筒状成形品１を発泡ビーズ法の型内成形で製造
することができるのである。つまり、一対のキャビティ
金型１１、１２内に形成される筒状の成形空間２０内に
原料粒子を充填して成形品１を加熱発泡成形した後、冷
却する。次に、図１８に示すように両キャビティ金型１
１、１２を開くとともに、エアシリンダ２２により成形
品１を中子型２１とともにキャビティ金型１２から取り
出した後、図１９に示すようにエジェクトピン２３を用
いて成形品１を中子型２１から離型させるのである。こ
の場合にも、前記の実施例と同様に、成形品１の内面に
凹凸を形成しないものにあっては、図２０に示すように
中子型２１から長さ方向に成形品１を引き抜くように離
型させることもできる。Even with this molding die, the cylindrical molded article 1 can be manufactured by the in-mold molding of the expanded bead method in exactly the same manner as described above. That is, after the raw material particles are filled in the cylindrical molding space 20 formed in the pair of cavity dies 11 and 12, the molded product 1 is heat-foam molded and then cooled. Next, as shown in FIG. 18, both cavity molds 1
After opening 1 and 12, the molded product 1 is taken out from the cavity mold 12 together with the core mold 21 by the air cylinder 22, and the molded product 1 is removed from the core mold 21 by using the eject pin 23 as shown in FIG. Release the mold. Also in this case, as in the case of the above-described embodiment, in the case where the inner surface of the molded product 1 is not uneven, the molded product 1 is pulled out from the core mold 21 in the longitudinal direction as shown in FIG. It can also be released from the mold.
【００２６】次に、図２１に示すものは、本発明にかか
る筒状成形品１の成形用金型の更に他実施例を示すもの
である。この実施例では、内部に筒状の成形空間２０を
形成する一対のキャビティ金型１１、１２のうちの一方
のキャビティ金型１２の内面に、筒状成形品１の中空内
部空間３を形成する中子型２１の外面から突設して筒状
成形品１の外部へ連通する割溝２を形成するための凸条
部２１ｂを着脱自在に嵌合することで、中子型２１を一
方のキャビティ金型１２に対して離合自在に設けてなる
ものである。Next, FIG. 21 shows still another embodiment of the molding die for the tubular molded article 1 according to the present invention. In this embodiment, the hollow internal space 3 of the tubular molded product 1 is formed on the inner surface of one of the pair of cavity molds 11 and 12 forming the cylindrical molding space 20 therein. The core 21 is detached from the outer surface of the core mold 21 by detachably fitting the ridge 21b for forming the split groove 2 communicating with the outside of the cylindrical molded product 1. It is provided so as to be detachable from the cavity mold 12.
【００２７】この金型を用いて筒状成形品１を製造する
方法を図２１〜図２４に基づき説明する。この実施例の
金型による筒状成形品１の製造方法も前記の実施例とほ
ぼ同様であって、図２１に示すように、一対のキャビテ
ィ金型１１、１２内に形成される筒状の成形空間２０内
に原料粒子を充填して加熱発泡成形し、冷却した後、図
２２に示すように両キャビティ金型１１、１２を開いて
内部の成形品１を中子型２１とともに取り出す。この場
合に成形品１を中子型２１とともにキャビティ金型１２
から取り出すには、エジェクトピンあるいは金型内面に
形成されている蒸気穴から圧縮空気を吹き出す等の適宜
手段により行う。そして、前記のように中子型２１とと
もに取り出された成形品１を、図２３に示すように成形
品１の割溝２部分を広げて中から中子型２１を取り出す
ことで成形品１を中子型２１から離型させるか、あるい
は、図２４に示すように、中子型２１から長さ方向に成
形品１を引き抜くようにして離型することで筒状成形品
１の製品を得る。尚、前記のように成形品１を離型させ
た後の中子型２１は、これを再びキャビティ金型１２内
面に取り付けて、次の成形操作に備えるのである。A method of manufacturing the cylindrical molded product 1 using this mold will be described with reference to FIGS. 21 to 24. The method of manufacturing the tubular molded product 1 by the mold of this embodiment is almost the same as that of the above-described embodiment, and as shown in FIG. 21, the cylindrical mold formed in the pair of cavity molds 11 and 12 is used. After the raw material particles are filled in the molding space 20 and the foam is heated and foamed and cooled, both cavity molds 11 and 12 are opened and the molded product 1 inside is taken out together with the core mold 21, as shown in FIG. In this case, the molded product 1 and the core mold 21 are combined with the cavity mold 12
In order to take it out from the inside, it is carried out by an appropriate means such as ejecting compressed air from an eject pin or a steam hole formed in the inner surface of the mold. Then, as shown in FIG. 23, the molded product 1 taken out together with the core mold 21 is expanded to widen the split groove 2 portion of the molded product 1, and the core mold 21 is taken out from the inside to form the molded product 1. A product of the tubular molded product 1 is obtained by releasing the molded product 1 from the core mold 21 or by removing the molded product 1 from the core mold 21 in the lengthwise direction as shown in FIG. . The core mold 21 after releasing the molded product 1 as described above is mounted on the inner surface of the cavity mold 12 again to prepare for the next molding operation.
【００２８】更に、図２５に示すものも、本発明にかか
る筒状成形品１の成形用金型の他実施例である。この実
施例では、内部に筒状の成形空間２０を形成する一対の
キャビティ金型１１、１２の一方のキャビティ金型１２
に、筒状成形品１の中空内部空間３から外部へ連通する
割溝２を形成する凸条部２１ｂを突設してなり、この凸
条部２１ｂの先端に、中空内部空間３を成形する中子型
２１を着脱自在に取り付けてなるものである。Further, FIG. 25 shows another embodiment of the molding die for the tubular molded product 1 according to the present invention. In this embodiment, one cavity mold 12 of a pair of cavity molds 11 and 12 that forms a cylindrical molding space 20 therein.
A projecting ridge portion 21b that forms a split groove 2 that communicates from the hollow inner space 3 of the tubular molded product 1 to the outside. The hollow inner space 3 is formed at the tip of this ridge portion 21b. The core mold 21 is detachably attached.
【００２９】この金型による筒状成形品１の製造方法を
図２５〜図２８に基づいて説明すると、まず、一方のキ
ャビティ金型１２に一体に設けられた凸条部２１ｂに中
子型２１を取り付けた状態で、一対のキャビティ金型１
１、１２内に形成される筒状成形空間２０内に原料粒子
を充填し、加熱発泡成形する。これを冷却した後、図２
６に示すように両キャビティ金型１１、１２を開けて内
部の成形品１を中子型２１とともに取り出す。そしてこ
の中子型２１とともに取り出された成形品１を図２７に
示すように割溝２部分を広げて中子型２１から離型させ
るか、あるいは図２８に示すように長さ方向に引き抜く
ことで離型させて筒状成形品１の製品を得る。A method for manufacturing the tubular molded product 1 by this mold will be described with reference to FIGS. 25 to 28. First, the core mold 21 is formed on the protrusion 21b integrally formed on one of the cavity molds 12. With a pair of cavities 1 attached
The raw material particles are filled in the cylindrical molding space 20 formed in the insides 1 and 12, and the foaming by heating is performed. After cooling this,
As shown in FIG. 6, both cavity molds 11 and 12 are opened and the molded product 1 inside is taken out together with the core mold 21. Then, the molded product 1 taken out together with the core mold 21 is separated from the core mold 21 by expanding the split groove 2 portion as shown in FIG. 27, or pulled out in the longitudinal direction as shown in FIG. Then, it is released from the mold to obtain a tubular molded product 1.
【００３０】そして、図２９に示すものは、本発明にか
かる筒状成形品１の成形用金型の更に他実施例を示すも
のである。この実施例の金型では、内部に筒状の成形空
間２０を形成する一対のキャビティ金型１１、１２のう
ちの一方のキャビティ金型１２の内面に、筒状成形品１
の中空内部空間３および割溝２を形成する膨出部２１ａ
と凸条部２１ｂとからなる中子型２１を一体に固着して
なるものである。FIG. 29 shows another embodiment of the molding die for the tubular molded article 1 according to the present invention. In the mold of this embodiment, the cylindrical molded product 1 is formed on the inner surface of one of the pair of cavity molds 11 and 12 forming the cylindrical molding space 20 therein.
Bulge 21a forming the hollow inner space 3 and the split groove 2 of
The core mold 21 including the ridge 21b and the ridge 21b is integrally fixed.
【００３１】この金型を用いて筒状成形品１を製造する
には、前記一対のキャビティ金型１１、１２内に形成さ
れる筒状成形空間２０内に原料粒子を充填し、これを加
熱発泡成形し、更に冷却した後、図３０に示すように両
キャビティ金型１１、１２を開くとともに、エジェクト
ピン２３等の適宜手段により一方のキャビティ金型１２
およびこれに固設した中子型２１から成形品１を離型さ
せるのである。この場合には、成形品１を離型させると
きに該成形品１の割溝２周囲のアンダーカット部分をキ
ャビティ金型１２および中子型２１との間の成形空間２
０から引き出すものであるから、成形に使用する樹脂材
料としては、発泡ポリエチレンや発泡ポリプロピレンと
いった比較的軟らかな発泡ポリオレフィン系の樹脂を用
いることが好ましい。In order to manufacture the cylindrical molded product 1 using this mold, raw material particles are filled in the cylindrical molding space 20 formed in the pair of cavity molds 11 and 12 and heated. After foam molding and further cooling, both cavity molds 11 and 12 are opened as shown in FIG. 30, and one cavity mold 12 is opened by an appropriate means such as an eject pin 23.
Also, the molded product 1 is released from the core mold 21 fixedly mounted on it. In this case, when the molded product 1 is released from the mold, the undercut portion around the split groove 2 of the molded product 1 is formed into the molding space 2 between the cavity mold 12 and the core mold 21.
Since it is derived from 0, it is preferable to use a relatively soft polyolefin resin such as expanded polyethylene or expanded polypropylene as the resin material used for molding.
【００３２】尚、以上の実施例はいずれも円筒状の成形
品についてのみ述べているが、本発明により製造される
筒状成形品の断面形状については円筒状のものに限定さ
れるものではなく、断面多角形状等の筒状製品でも同様
に製造しうることはいうまでもない。In all of the above examples, only the cylindrical molded product is described, but the cross-sectional shape of the cylindrical molded product manufactured by the present invention is not limited to the cylindrical product. Needless to say, a tubular product having a polygonal cross section or the like can be manufactured in the same manner.
【００３３】[0033]
【発明の効果】以上のように、本発明によれば、発泡ビ
ーズ法の型内成形により、長さ方向にそって割溝を有
し、アンダーカット部のある筒状の熱可塑性発泡樹脂成
形品を成形するに際して、従来のように半割りの状態で
なく、一度の成形で筒状に成形できることから、金型面
積当たりの取り数が多く、したがって生産性がよいので
コスト的にも押出発泡法や発泡シートの真空成形法に十
分に対抗することができると同時に、これらの押出発泡
法や発泡シートの真空形成法によっては製造することが
できない、長さ方向に凹凸を有する筒状成形品をも製造
することができるのである。As described above, according to the present invention, by the in-mold molding of the expanded bead method, a cylindrical thermoplastic foamed resin molding having a split groove along the length direction and an undercut portion is formed. When a product is molded, it can be molded into a tubular shape by molding once instead of the conventional half-split state.Therefore, the number of molds taken per mold area is large, so productivity is good, and extrusion foaming is also cost effective. And a vacuum molding method for a foamed sheet, and at the same time, a tubular molded product having irregularities in the length direction, which cannot be manufactured by the extrusion foaming method or the vacuum forming method for a foamed sheet. Can also be manufactured.
【図１】 筒状熱可塑性発泡樹脂成形品の１例を示す斜
視図。FIG. 1 is a perspective view showing an example of a tubular thermoplastic foamed resin molded product.
【図２】 従来の発泡ビーズ法の型内成形で筒状成形品
を製造する場合の１例を示す半割り製品の斜視図。FIG. 2 is a perspective view of a half-divided product showing an example in the case of manufacturing a tubular molded product by in-mold molding of a conventional foamed bead method.
【図３】 前記半割り製品を筒状に形成する様子を示す
斜視図。FIG. 3 is a perspective view showing how the half-divided product is formed into a tubular shape.
【図４】 同じく、従来の発泡ビーズ法の型内成形で筒
状成形品を製造する場合の他の方法を示す斜視図。FIG. 4 is a perspective view showing another method of manufacturing a tubular molded product by in-mold molding of a conventional foamed beads method.
【図５】 本発明により製造される筒状熱可塑性発泡樹
脂成形品の１例を示す斜視図。FIG. 5 is a perspective view showing an example of a tubular thermoplastic foamed resin molded article manufactured according to the present invention.
【図６】 前記筒状成形品の拡大縦断面図。FIG. 6 is an enlarged vertical cross-sectional view of the tubular molded product.
【図７】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の成形用金型の１例を示す縦断面図。FIG. 7 is a longitudinal sectional view showing an example of a molding die for a tubular thermoplastic foam resin molded product according to the present invention.
【図８】 図７におけるＡ−Ａ拡大断面図。8 is an enlarged cross-sectional view taken along line AA in FIG.
【図９】 図７におけるＢ−Ｂ拡大断面図。9 is an enlarged sectional view taken along line BB in FIG. 7.
【図10】 前記成形用金型を開いて成形品を中子型とと
もにキャビティ金型から取り出した状態の縦断面図。FIG. 10 is a vertical cross-sectional view showing a state in which the molding die is opened and the molded product is taken out from the cavity mold together with the core mold.
【図11】 図10におけるＣ−Ｃ拡大断面図。11 is an enlarged sectional view taken along line CC of FIG.
【図12】 前記成形品を前記中子型から離型した状態を
示す縦断面図。FIG. 12 is a vertical cross-sectional view showing a state where the molded product is released from the core mold.
【図13】 図12におけるＤ−Ｄ拡大断面図。13 is an enlarged cross-sectional view taken along line DD of FIG.
【図14】 成形品を中子型から引き抜いて離型する方法
を示す縦断面図。FIG. 14 is a vertical cross-sectional view showing a method of pulling out a molded product from a core mold and releasing it.
【図15】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の１実施例を示す拡大横断面図。FIG. 15 is an enlarged cross-sectional view showing an embodiment of a tubular thermoplastic foam resin molded product according to the present invention.
【図16】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の他実施例を示す拡大横断面図。FIG. 16 is an enlarged cross-sectional view showing another embodiment of the tubular thermoplastic foam resin molded product according to the present invention.
【図17】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の更に他実施例を示す拡大横断面図。FIG. 17 is an enlarged cross-sectional view showing still another embodiment of the tubular thermoplastic foam resin molded product according to the present invention.
【図18】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の成形用金型の他実施例において金型を開いて成形品を
中子型とともに取り出した状態を示す拡大横断面図。FIG. 18 is an enlarged transverse cross-sectional view showing a state in which the mold is opened and the molded product is taken out together with the core mold in another embodiment of the mold for molding the tubular thermoplastic foam resin molded product according to the present invention.
【図19】 前記成形品を中子型から離型した状態を示す
拡大横断面図。FIG. 19 is an enlarged cross-sectional view showing a state where the molded product is released from the core mold.
【図20】 成形品を中子型から引き抜いて離型する方法
を示す縦断面図。FIG. 20 is a vertical cross-sectional view showing a method of pulling out a molded product from a core mold and releasing it.
【図21】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の成形用金型の更に他実施例を示す横断面図。FIG. 21 is a cross-sectional view showing still another embodiment of the molding die for the tubular thermoplastic foam resin molded product according to the present invention.
【図22】 前記成形用金型を開いて成形品を中子型とと
もに取り出した状態を示す横断面図。FIG. 22 is a transverse cross-sectional view showing a state in which the molding die is opened and the molded product is taken out together with the core mold.
【図23】 前記成形品の割溝を広げて中子型から離型す
る方法を示す横断面図。FIG. 23 is a cross-sectional view showing a method of expanding the split groove of the molded product and releasing it from the core mold.
【図24】 前記成形品を中子型から引き抜いて離型する
方法を示す縦断面図。FIG. 24 is a vertical cross-sectional view showing a method of pulling out the molded product from the core mold and releasing the mold.
【図25】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の成形用金型の更に他実施例を示す横断面図。FIG. 25 is a cross-sectional view showing still another embodiment of a molding die for a tubular thermoplastic foam resin molded product according to the present invention.
【図26】 前記成形用金型を開いて成形品を中子型とと
もに取り出した状態を示す横断面図。FIG. 26 is a transverse cross-sectional view showing a state in which the molding die is opened and the molded product is taken out together with the core mold.
【図27】 前記成形品の割溝を広げて中子型から離型す
る方法を示す横断面図。FIG. 27 is a cross-sectional view showing a method of expanding the split groove of the molded product and releasing it from the core mold.
【図28】 前記成形品を中子型から引き抜いて離型する
方法を示す縦断面図。FIG. 28 is a vertical cross-sectional view showing a method of pulling out the molded product from the core mold and releasing it.
【図29】 本発明にかかる筒状熱可塑性発泡樹脂成形品
の成形用金型の更に他実施例を示す横断面図。FIG. 29 is a transverse cross-sectional view showing still another embodiment of the molding die for the tubular thermoplastic foam resin molded product according to the present invention.
【図30】 前記成形品をキャビティ金型から離型する方
法を示す横断面図。FIG. 30 is a cross-sectional view showing a method of releasing the molded product from the cavity mold.
１ 筒状成形品 ２ 割溝 ３ 中空内部空間 １１ キャビティ金型 １２ キャビティ
金型 １３ 蒸気室 １４ 蒸気室 １５ 蒸気管 １６ 蒸気管 １７ ドレン １８ ドレン １９ 原料充填フィーダ ２０ 成形空間 ２１ 中子型 ２２ エアシリン
ダ ２３ エジェクトピン1 Cylindrical Molded Product 2 Split Groove 3 Hollow Internal Space 11 Cavity Mold 12 Cavity Mold 13 Steam Chamber 14 Steam Chamber 15 Steam Pipe 16 Steam Pipe 17 Drain 18 Drain 19 Raw Material Filling Feeder 20 Molding Space 21 Core 22 Air Cylinder 23 Eject pin
Claims (16)
型内で一体成形してなり、長さ方向全長にわたって連続
する割溝を形成してなることを特徴とする筒状熱可塑性
発泡樹脂成形品。1. A tubular thermoplastic foamed resin molded article, characterized in that it is integrally molded in a mold by a foamed bead method of a thermoplastic foamed resin and has a continuous groove formed over the entire length in the length direction. .
方向にそって凹凸を形成してなることを特徴とする請求
項１記載の筒状熱可塑性発泡樹脂成形品。2. The tubular thermoplastic resin foam molded article according to claim 1, wherein irregularities are formed along at least one of the outer surface and the inner surface in the length direction.
してなることを特徴とする請求項２記載の筒状熱可塑性
発泡樹脂成形品。3. The cylindrical thermoplastic foamed resin molded article according to claim 2, wherein irregularities are formed on at least the inner surface in the longitudinal direction.
る請求項１または請求項２または請求項３記載の筒状熱
可塑性発泡樹脂成形品。4. The tubular thermoplastic foamed resin molded article according to claim 1, 2 or 3, wherein the thermoplastic foamed resin is polyolefin.
係止する係止部を形成してなることを特徴とする請求項
１または請求項２または請求項３または請求項４記載の
筒状熱可塑性発泡樹脂成形品。5. The cylinder according to claim 1, wherein the split grooves are formed with locking portions which are fitted and locked to each other on the end surfaces facing each other. Thermoplastic foamed resin moldings.
キャビティ金型内に、前記両キャビティ金型によって形
成される成形空間の長さ方向全長にわたって筒状成形品
の中空内部空間およびこの内部空間から外部に連通する
割溝を形成する中子型を、前記両キャビティ金型から離
合自在に設けてなる筒状熱可塑性発泡樹脂成形品の成形
用金型。6. A hollow internal space of a cylindrical molded product and a hollow internal space of the cylindrical molded product over the entire length in the length direction of a molding space formed by the cavity molds in a pair of cavity molds forming the outer surface shape of the cylindrical molded product. A mold for molding a tubular thermoplastic foam resin molded product, wherein a core mold that forms a split groove that communicates from the internal space to the outside is provided so as to be separable from the cavity molds.
中子型を離合自在に設けてなる請求項６記載の筒状熱可
塑性発泡樹脂成形品の成形用金型。7. The mold for molding a tubular thermoplastic foam resin molded article according to claim 6, wherein a core mold is detachably provided in one of the cavity molds by an extrusion means.
る離型手段を設けてなることを特徴とする請求項７記載
の筒状熱可塑性発泡樹脂成形品の成形用金型。8. A mold for molding a tubular thermoplastic foamed resin molded product according to claim 7, wherein the core mold is provided with a releasing means for releasing the molded product from the core mold. .
キャビティ金型の一方に、前記両キャビティ金型によっ
て形成される成形空間の長さ方向全長にわたって筒状成
形品の内部空間から外部に連通する割溝を形成する凸条
を一体に設けるとともに、前記凸条部分に筒状成形品の
中空内部空間を形成する中子型を離合自在に設けてなる
ことを特徴とする筒状熱可塑性発泡樹脂成形品の成形用
金型。9. One of a pair of cavity molds forming the outer surface shape of the tubular molded product is provided with an outer space from the inner space of the cylindrical molded product over the entire length in the length direction of the molding space formed by the two cavity molds. A cylindrical heat generating member is provided integrally with a ridge forming a split groove communicating with the core, and a core die for forming a hollow internal space of a cylindrical molded product is detachably provided in the ridge portion. Mold for molding plastic foam resin molded products.
段により中子型を離合自在に設けてなることを特徴とす
る請求項９記載の筒状熱可塑性発泡樹脂成形品の成形用
金型。10. A mold for molding a tubular thermoplastic foamed resin molded product according to claim 9, wherein a core mold is provided by a pushing means so as to be detachable from the cavity mold provided with a convex strip. .
せる離型手段を設けてなることを特徴とする請求項１０
記載の筒状熱可塑性発泡樹脂成形品の成形用金型。11. The core die is provided with a releasing means for releasing a molded product from the core die.
A mold for molding the tubular thermoplastic foamed resin molded article described.
のキャビティ金型の一方に、前記両キャビティ金型によ
って形成される成形空間の長さ方向全長にわたって筒状
成形品の中空内部空間およびこの内部空間から外部に連
通する割溝を形成する中子型を一体に設け、該中子型に
成形品を離型させる離型手段を設けてなることを特徴と
する筒状熱可塑性発泡樹脂成形品の成形用金型。12. A hollow internal space of a tubular molded product, which is provided in one of a pair of cavity molds forming an outer surface shape of the tubular molded product, over the entire length in the length direction of a molding space formed by the two cavity molds. A cylindrical thermoplastic foamed resin, characterized in that a core die for forming a split groove communicating from the inner space to the outside is integrally provided, and a mold releasing means for releasing the molded product from the core die is provided. Mold for molding molded products.
のキャビティ金型の一方に、前記両キャビティ金型によ
って形成される成形空間の長さ方向全長にわたって筒状
成形品の中空内部空間およびこの内部空間から外部に連
通する割溝を形成する中子型を離合自在に設けて長さ方
向全長にわたって連続する割溝を有する筒状の成形空間
を形成してなる成形用金型の前記成形空間に、原料粒子
を充填し、この成形用金型を加熱して前記成形空間内の
原料粒子を発泡させるとともに互いに発泡融着させて長
さ方向の全長にわたって割溝を有する筒状成形品を型内
成形した後、金型を冷却し、次いで両キャビティ金型を
開放するとともに、前記成形品を中子型とともに前記一
方のキャビティ金型から取り出し、更にこの中子型から
成形品を離型させることを特徴とする筒状熱可塑性発泡
樹脂成形品の製造方法。13. A hollow internal space of a cylindrical molded product, which is formed in one of a pair of cavity molds forming an outer surface shape of the cylindrical molded product, over the entire length in the length direction of a molding space formed by the both cavity molds. The molding of the molding die, in which a core mold for forming a split groove that communicates with the outside from the internal space is detachably provided to form a cylindrical molding space having a continuous split groove over the entire length in the longitudinal direction. A space is filled with raw material particles, and the molding die is heated to foam the raw material particles in the molding space, and also foam-fused with each other to form a tubular molded product having a split groove over the entire length in the longitudinal direction. After in-mold molding, cool the mold, then open both cavity molds, take out the molded product together with the core mold from the one cavity mold, and further release the molded product from this core mold. Let A method for producing a tubular thermoplastic foamed resin molded article, comprising:
のキャビティ金型の一方に、前記両キャビティ金型によ
って形成される成形空間の長さ方向全長にわたって筒状
成形品の割溝を形成する凸条を設け、前記凸条部分に筒
状成形品の中空内部空間を形成する中子型を離合自在に
設けて長さ方向全長にわたって連続する割溝を有する筒
状の成形空間を形成してなる成形用金型の前記成形空間
に、原料粒子を充填し、この成形用金型を加熱して前記
成形空間内の原料粒子を発泡させるとともに互いに発泡
融着させて長さ方向の全長にわたって割溝を有する筒状
成形品を型内成形した後、金型を冷却し、次いで両キャ
ビティ金型を開放するとともに、前記成形品を中子型と
ともに前記一方のキャビティ金型から取り出し、更にこ
の中子型から成形品を離型させることを特徴とする筒状
熱可塑性発泡樹脂成形品の製造方法。14. A split groove of a cylindrical molded product is formed in one of a pair of cavity molds forming the outer surface shape of the cylindrical molded product over the entire length in the length direction of a molding space formed by the both cavity molds. And a core mold for forming a hollow internal space of a tubular molded product is provided in the ridge portion so as to be separable to form a cylindrical molding space having a continuous split groove over the entire length in the longitudinal direction. The molding space of the molding die is filled with raw material particles, and the molding die is heated to foam the raw material particles in the molding space and to be foam-fused to each other over the entire length in the longitudinal direction. After in-molding a tubular molded product having a split groove, the mold is cooled, then both cavity molds are opened, and the molded product is taken out from the one cavity mold together with the core mold. From core mold to molded product A method for producing a tubular thermoplastic foamed resin molded article, characterized in that:
のキャビティ金型の一方に、前記両キャビティ金型によ
って形成される成形空間の長さ方向全長にわたって筒状
成形品の中空内部空間およびこの内部空間から外部に連
通する割溝を形成する中子型を一体に設けて長さ方向全
長にわたって連続する割溝を有する筒状の成形空間を形
成してなる成形用金型の前記成形空間に、原料粒子を充
填し、この成形用金型を加熱して前記成形空間内の原料
粒子を発泡させるとともに互いに発泡融着させて長さ方
向の全長にわたって割溝を有する筒状成形品を型内成形
した後、金型を冷却し、次いで両キャビティ金型を開放
するとともに、前記一方のキャビティ金型およびこれに
一体に設けられた中子型から成形品を離型させることを
特徴とする筒状熱可塑性発泡樹脂成形品の製造方法。15. A hollow internal space of a tubular molded product, which is provided in one of a pair of cavity molds forming an outer surface shape of the tubular molded product, over the entire length in the length direction of a molding space formed by the cavity molds. The molding space of the molding die, in which a core mold for forming a split groove that communicates from the inner space to the outside is integrally provided to form a cylindrical molding space having a continuous split groove over the entire length in the length direction. , The raw material particles are filled, and the molding die is heated to foam the raw material particles in the molding space, and the foamed particles are fused to each other to form a cylindrical molded product having a split groove over the entire length in the longitudinal direction. After the inner molding, the mold is cooled, then both cavity molds are opened, and the molded product is released from the one cavity mold and the core mold integrally provided therein. Tubular heat A method for producing a plastic foam resin molded product.
ある請求項１５記載の筒状熱可塑性発泡樹脂成形品の製
造方法。16. The method for producing a tubular thermoplastic foam resin molded article according to claim 15, wherein the thermoplastic foam resin is polyolefin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27227093A JP3569932B2 (en) | 1993-10-29 | 1993-10-29 | Mold for molding tubular thermoplastic foamed resin molded article and method of manufacturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27227093A JP3569932B2 (en) | 1993-10-29 | 1993-10-29 | Mold for molding tubular thermoplastic foamed resin molded article and method of manufacturing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07124980A true JPH07124980A (en) | 1995-05-16 |
| JP3569932B2 JP3569932B2 (en) | 2004-09-29 |
Family
ID=17511514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27227093A Expired - Fee Related JP3569932B2 (en) | 1993-10-29 | 1993-10-29 | Mold for molding tubular thermoplastic foamed resin molded article and method of manufacturing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3569932B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007167430A (en) * | 2005-12-22 | 2007-07-05 | Omron Healthcare Co Ltd | Manufacturing method for curved elastic board to be mounted on blood-pressure cuff |
-
1993
- 1993-10-29 JP JP27227093A patent/JP3569932B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007167430A (en) * | 2005-12-22 | 2007-07-05 | Omron Healthcare Co Ltd | Manufacturing method for curved elastic board to be mounted on blood-pressure cuff |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3569932B2 (en) | 2004-09-29 |
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