JPH07314533A - Extrusion molding method for thermoplastic resin pipe - Google Patents
Extrusion molding method for thermoplastic resin pipeInfo
- Publication number
- JPH07314533A JPH07314533A JP6110907A JP11090794A JPH07314533A JP H07314533 A JPH07314533 A JP H07314533A JP 6110907 A JP6110907 A JP 6110907A JP 11090794 A JP11090794 A JP 11090794A JP H07314533 A JPH07314533 A JP H07314533A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- thermoplastic resin
- foamed
- extrusion molding
- resin pipe
- 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
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は熱可塑性樹脂管の押出成
形方法に関し、特に、内層が非発泡の熱可塑性樹脂層で
あり、外層が発泡された熱可塑性樹脂層である２層の熱
可塑性樹脂管の押出成形方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extrusion-molding a thermoplastic resin tube, and more particularly, to two layers of thermoplastic resin, the inner layer being a non-foamed thermoplastic resin layer and the outer layer being a foamed thermoplastic resin layer. The present invention relates to an extrusion molding method for a resin pipe.
【０００２】[0002]
【従来の技術】従来、内層が非発泡の熱可塑性樹脂層で
あり、外層が発泡された熱可塑性樹脂層である２層の熱
可塑性樹脂管は、例えば、実公昭５５−３５１４７号公
報に記載されているように、金属管の内面にライニング
する材料として好適である。2. Description of the Related Art Conventionally, a two-layered thermoplastic resin tube in which an inner layer is a non-foamed thermoplastic resin layer and an outer layer is a foamed thermoplastic resin layer is described, for example, in Japanese Utility Model Publication No. 55-35147. As described above, it is suitable as a material for lining the inner surface of a metal tube.
【０００３】このような内層が非発泡の熱可塑性樹脂層
であり、外層が発泡された熱可塑性樹脂層である２層の
熱可塑性樹脂管は２層押出成形用金型を使用し、この２
層押出成形用金型に発泡性樹脂と非発泡樹脂とを供給
し、２層押出成形用金型から押出した２層の熱可塑性樹
脂管を水槽に導入通過させて冷却固化し、一定長さに切
断して製造される。A two-layer thermoplastic resin tube in which the inner layer is a non-foamed thermoplastic resin layer and the outer layer is a foamed thermoplastic resin layer uses a two-layer extrusion molding die.
A foaming resin and a non-foaming resin are supplied to a layer extrusion molding die, and a two-layer thermoplastic resin tube extruded from the two-layer extrusion molding die is introduced into a water tank to be cooled and solidified so that a fixed length is obtained. Manufactured by cutting into.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の熱可塑性樹脂管の押出成形方法においては、
水槽内に２層の熱可塑性樹脂管を通過させると、外層の
発泡樹脂層に水分が含浸され外層の発泡樹脂層に水分が
残留する。このように外層の発泡樹脂層に水分が残留さ
れた状態でその外面に接着剤を塗布し金属管内に挿入
し、加熱により膨張させてライニングすると、残留寸分
の蒸発により膨れが生じたり、接着力の低下を招き、製
作されたライニング管の性能に悪い影響を及ぼす。However, in such a conventional thermoplastic resin pipe extrusion molding method,
When the two layers of thermoplastic resin pipes are passed through the water tank, the outer foamed resin layer is impregnated with water and the outer foamed resin layer remains with water. In this way, when water is left in the outer foamed resin layer, an adhesive is applied to the outer surface, inserted into a metal tube, expanded by heating and lining, and swelling occurs due to evaporation of the remaining dimension, or adhesive strength. Of the lining pipe, which adversely affects the performance of the manufactured lining pipe.
【０００５】本発明は、従来の熱可塑性樹脂管の押出成
形方法における、このような問題点に着目してなされた
ものであり、その目的とするところは、上記の問題を解
決し、外層の発泡樹脂層に水分が残留する恐れのない熱
可塑性樹脂管の押出成形方法を提供するにある。The present invention has been made by paying attention to such problems in the conventional extrusion molding method for thermoplastic resin pipes, and the purpose of the present invention is to solve the above problems and to improve the outer layer. Another object of the present invention is to provide an extrusion molding method for a thermoplastic resin tube in which there is no risk of water remaining in the foamed resin layer.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の本発明熱可塑性樹脂管の押出成形方
法は、２層押出成形用金型を使用し、内層に非発泡の熱
可塑性樹脂層が設けられ、外層に発泡された熱可塑性樹
脂層が設けられた２層の熱可塑性樹脂管を押出成形し、
この２層の熱可塑性樹脂管を水槽に通過させて冷却後、
温風により外層の発泡された熱可塑性樹脂層に含浸され
た水分を乾燥することを特徴とするものである。In order to achieve the above object, the method of extrusion molding a thermoplastic resin pipe according to the present invention as set forth in claim 1 uses a two-layer extrusion molding die and a non-foaming inner layer. A thermoplastic resin layer is provided, and two layers of thermoplastic resin pipes provided with a foamed thermoplastic resin layer as an outer layer are extruded and molded.
After passing this two-layer thermoplastic resin tube through a water tank and cooling,
The moisture impregnated in the foamed thermoplastic resin layer of the outer layer is dried with warm air.
【０００７】又、請求項２記載の本発明熱可塑性樹脂管
の押出成形方法は、請求項１記載の熱可塑性樹脂管の押
出成形方法において、水槽に導入して冷却した２層の熱
可塑性樹脂管を揮発性溶液が収納された槽内を通過さ
せ、次いで温風により外層の発泡された熱可塑性樹脂層
に含浸された水分を乾燥することを特徴とする。Further, the extrusion molding method of the thermoplastic resin pipe according to the second aspect of the present invention is the extrusion molding method of the thermoplastic resin pipe according to the first aspect, wherein the two layers of the thermoplastic resin are introduced into a water tank and cooled. It is characterized in that the tube is passed through a tank containing a volatile solution, and then the water impregnated in the foamed thermoplastic resin layer of the outer layer is dried by hot air.
【０００８】本発明方法により成形される管の材質であ
る熱可塑性樹脂としては、特に限定されるものではない
が、例えば、塩化ビニル樹脂、ポリエチレン、ポリプロ
ピレン等である。The thermoplastic resin which is the material of the pipe molded by the method of the present invention is not particularly limited, but examples thereof include vinyl chloride resin, polyethylene and polypropylene.
【０００９】又、請求項１、２記載の発明において、温
風の温度としては、２０〜８０℃程度である。又、請求
項２記載の発明において、揮発性溶液としては、特に限
定されないが、例えば、沸点が５０℃以下のメタノー
ル、エタノール等の水溶液が経済的であって好適に使用
できる。Further, in the inventions of claims 1 and 2, the temperature of the warm air is about 20 to 80 ° C. Further, in the invention of claim 2, the volatile solution is not particularly limited, but for example, an aqueous solution of methanol, ethanol or the like having a boiling point of 50 ° C. or less is economical and can be preferably used.
【００１０】[0010]
【作用】請求項１記載の本発明熱可塑性樹脂管の押出成
形方法においては、２層押出成形用金型を使用し、内層
に非発泡の熱可塑性樹脂層が設けられ、外層に発泡され
た熱可塑性樹脂層が設けられた２層の熱可塑性樹脂管を
押出成形し、この２層の熱可塑性樹脂管を水槽に通過さ
せて冷却後、温風により外層の発泡された熱可塑性樹脂
層に含浸された水分を乾燥するので、外層の発泡された
熱可塑性樹脂層には水分は残留しない。In the extrusion molding method for a thermoplastic resin pipe according to the present invention, a two-layer extrusion molding die is used, a non-foamed thermoplastic resin layer is provided in the inner layer, and the outer layer is foamed. A two-layer thermoplastic resin tube provided with a thermoplastic resin layer is extrusion-molded, and the two-layer thermoplastic resin tube is passed through a water tank and cooled, and then the outer layer is expanded into a foamed thermoplastic resin layer by warm air. Since the impregnated water is dried, no water remains in the foamed thermoplastic resin layer as the outer layer.
【００１１】又、請求項２記載の本発明熱可塑性樹脂管
の押出成形方法においては、水槽に導入して冷却した２
層の熱可塑性樹脂管を揮発性溶液が収納された槽内を通
過させ、次いで温風により外層の発泡された熱可塑性樹
脂層に含浸された水分を乾燥するので、外層の発泡され
た熱可塑性樹脂層には水分は残留しない。Further, in the extrusion molding method of the thermoplastic resin pipe of the present invention according to the second aspect, it is introduced into a water tank and cooled.
The thermoplastic resin tube of the layer is passed through the tank containing the volatile solution, and the moisture impregnated in the foamed thermoplastic resin layer of the outer layer is dried by hot air, so that the foamed thermoplastic layer of the outer layer is No water remains in the resin layer.
【００１２】[0012]
【実施例】次に、本発明の実施例を、図面を参照しなが
ら説明する。 〔実施例１〕図１は本発明熱可塑性樹脂管の押出成形方
法の一実施態様を示す説明図である。図１において、１
はメイン押出機であり、メイン押出機１からは非発泡の
硬質塩化ビニル樹脂管１ｂが押し出される。２はサブ押
出機であり、サブ押出機２からは発泡性の軟質塩化ビニ
ル樹脂管１ａが押し出される。３は２層押出成形用金型
であり、メイン押出機１から押し出される非発泡の硬質
塩化ビニル樹脂管１ｂとサブ押出機２から押し出される
発泡性の軟質塩化ビニル樹脂管１ａとが２層押出成形用
金型３に導入されて合流され、２層押出成形用金型３か
らは、内層が非発泡の硬質塩化ビニル樹脂層からなり、
外層が発泡された軟質塩化ビニル樹脂層からなる２層の
塩化ビニル樹脂管１ｃが押し出されるようになってい
る。Embodiments of the present invention will now be described with reference to the drawings. Example 1 FIG. 1 is an explanatory view showing one embodiment of the extrusion molding method for a thermoplastic resin pipe of the present invention. In FIG. 1, 1
Is a main extruder, and a non-foamed hard vinyl chloride resin pipe 1b is extruded from the main extruder 1. Reference numeral 2 denotes a sub-extruder from which a foamable soft vinyl chloride resin pipe 1a is extruded. Reference numeral 3 denotes a two-layer extrusion molding die, in which a non-foaming hard vinyl chloride resin pipe 1b extruded from the main extruder 1 and a foamable soft vinyl chloride resin pipe 1a extruded from the sub extruder 2 are two-layer extrusion. After being introduced into the molding die 3 and merged, the inner layer of the two-layer extrusion molding die 3 is a non-foamed hard vinyl chloride resin layer,
A two-layer vinyl chloride resin tube 1c made of a soft vinyl chloride resin layer whose outer layer is foamed is extruded.
【００１３】４は２層押出成形用金型３の前方に設けら
れた冷却用水槽であり、冷却水槽４の内部には冷却用水
が蓄えられ、冷却水槽４の塩化ビニル樹脂管１ｃの導入
部にフォーミングチュウブが設けられ、出口部にはゴム
パッキンが設けられ、塩化ビニル樹脂管１ｃが冷却水槽
４内に導入されることにより塩化ビニル樹脂管１ｃが賦
形され、塩化ビニル樹脂管１ｃが冷却水槽４内を通過す
ることにより冷却固化され、出口部の合成ゴム製パッキ
ンを通過することにより外層の発泡樹脂層から余分な水
分が除去されるようになっている。Reference numeral 4 denotes a cooling water tank provided in front of the two-layer extrusion molding die 3. Cooling water is stored inside the cooling water tank 4, and the introduction portion of the vinyl chloride resin pipe 1c of the cooling water tank 4 is introduced. Is provided with a forming tube, a rubber packing is provided at an outlet, and the vinyl chloride resin pipe 1c is shaped by introducing the vinyl chloride resin pipe 1c into the cooling water tank 4 and the vinyl chloride resin pipe 1c is cooled. By passing through the water tank 4, it is cooled and solidified, and by passing through the synthetic rubber packing at the outlet portion, excess water is removed from the foamed resin layer as the outer layer.
【００１４】５は冷却槽４の後方に設けられた温風発生
装置であり、温風発生装置５の図示しない温風吹き出し
口から４０〜５０℃の温風が塩化ビニル樹脂管１ｃの表
面に吹きつけられることにより塩化ビニル樹脂管１ｃの
外層の発泡樹脂層内の残留水分が乾燥されるようになっ
ている。６は引取機、７は定尺切断装置である。Reference numeral 5 denotes a warm air generator provided at the rear of the cooling tank 4. Hot air of 40 to 50 ° C. is blown onto the surface of the vinyl chloride resin pipe 1c from a warm air blowout port (not shown) of the warm air generator 5. The residual water in the foamed resin layer, which is the outer layer of the vinyl chloride resin tube 1c, is dried by being blown. Reference numeral 6 is a take-off machine, and 7 is a standard length cutting device.
【００１５】次に、このような装置を使用して本発明方
法により塩化ビニル樹脂管１ｃを成形する態様を順を追
って説明する。メイン押出機１から押し出された非発泡
樹脂管１ｂとサブ押出機２から押し出された発泡樹脂管
１ａとが２層押出成形用金型３により内層が非発泡の硬
質塩化ビニル樹脂層からなり、外層が発泡された軟質塩
化ビニル樹脂層からなる２層の塩化ビニル樹脂管１ｃが
成形される。Next, the mode of molding the vinyl chloride resin pipe 1c by the method of the present invention using such an apparatus will be described step by step. The non-foamed resin tube 1b extruded from the main extruder 1 and the foamed resin tube 1a extruded from the sub extruder 2 are made of a non-foamed hard vinyl chloride resin layer by a two-layer extrusion molding die 3, A two-layer vinyl chloride resin pipe 1c having a soft vinyl chloride resin layer whose outer layer is foamed is molded.
【００１６】次いで、冷却水槽４を通過することにより
冷却固化され、温風発生装置５を通過することにより外
層の軟質塩化ビニル樹脂層に残留する水分が乾燥され、
引取機６を経由して切断機７により切断されて製品とな
る。Then, it is cooled and solidified by passing through the cooling water tank 4, and the water remaining in the outer soft vinyl chloride resin layer is dried by passing through the warm air generator 5.
The product is cut by the cutting machine 7 via the take-up machine 6.
【００１７】〔実施例２：請求項２記載の発明の実施
例〕図２は本発明熱可塑性樹脂管の押出成形方法の他の
一実施態様を示す説明図である。図２に示す態様におい
ては、冷却水槽４と温風吹き出し装置５との間にメタノ
ール水溶液が蓄えられた揮発性溶液槽８が設けられ、温
風吹き出し装置５は揮発性溶液槽８の後方に設けられて
いる。[Example 2: Example of the invention according to claim 2] Fig. 2 is an explanatory view showing another embodiment of the extrusion molding method of the thermoplastic resin pipe of the present invention. In the embodiment shown in FIG. 2, a volatile solution tank 8 in which an aqueous methanol solution is stored is provided between the cooling water tank 4 and the warm air blowing apparatus 5, and the warm air blowing apparatus 5 is provided behind the volatile solution tank 8. It is provided.
【００１８】図２に示す装置により本発明方法により塩
化ビニル樹脂管１ｃを成形する態様を順を追って説明す
る。メイン押出機１から押し出された非発泡樹脂管１ｂ
とサブ押出機２から押し出された発泡樹脂管１ａとが２
層押出成形用金型３により内層が非発泡の硬質塩化ビニ
ル樹脂層からなり、外層が発泡された軟質塩化ビニル樹
脂層からなる２層の塩化ビニル樹脂管１ｃが成形され
る。A mode of molding the vinyl chloride resin pipe 1c by the method of the present invention using the apparatus shown in FIG. 2 will be described step by step. Non-foamed resin tube 1b extruded from the main extruder 1.
And the foamed resin pipe 1a extruded from the sub extruder 2
The layer extrusion molding die 3 molds a two-layer vinyl chloride resin pipe 1c having an inner layer made of a non-foamed hard vinyl chloride resin layer and an outer layer made of a foamed soft vinyl chloride resin layer.
【００１９】次いで、冷却水槽４を通過することにより
冷却固化され、更に揮発性溶液槽８を３０秒間通過する
ことにより外層にメタノール水溶液が含浸され、温風発
生装置５を通過することにより外層の軟質塩化ビニル樹
脂層に残留する水分が乾燥され、引取機６を経由して切
断機７により切断されて製品となる。Then, it is cooled and solidified by passing through the cooling water tank 4, and further passed through the volatile solution tank 8 for 30 seconds so that the outer layer is impregnated with the aqueous methanol solution. The moisture remaining in the soft vinyl chloride resin layer is dried and cut by the cutting machine 7 via the take-up machine 6 to obtain a product.
【００２０】〔実施例３〕本実施例においては、実施例
２のメタノール水溶液が蓄えられた揮発性溶液槽を使用
する代わりにエタノール水溶液が蓄えられた揮発性溶液
槽を使用するものである。 〔評価〕叙上の実施例１〜３により成形された内層が非
発泡の硬質塩化ビニル樹脂層からなり、外層が発泡され
た軟質塩化ビニル樹脂層からなる２層の塩化ビニル樹脂
管１ｃを使用し、図３に示すように、外面に接着剤を塗
布して加熱膨張させて鋼管９内にライニングした結果、
実施例１、２による２層の塩化ビニル樹脂管１ｃの接着
強度は２０ｋｇ／ｃｍ2 であり、外層に膨れ等は発生し
なかった。[Embodiment 3] In this embodiment, a volatile solution tank in which an aqueous solution of ethanol is stored is used in place of the volatile solution tank in which the aqueous methanol solution is stored in Example 2. [Evaluation] A two-layer vinyl chloride resin pipe 1c having an inner layer made of a non-foamed hard vinyl chloride resin layer and an outer layer made of a foamed soft vinyl chloride resin layer molded according to Examples 1 to 3 is used. Then, as shown in FIG. 3, as a result of applying an adhesive to the outer surface, heating and expanding it, and lining it in the steel pipe 9,
The adhesive strength of the two-layer vinyl chloride resin tube 1c according to Examples 1 and 2 was 20 kg / cm 2 , and no blistering or the like occurred in the outer layer.
【００２１】実施例３による２層の塩化ビニル樹脂管１
ｃを使用した場合の接着強度は２５ｋｇ／ｃｍ2 であ
り、外層に膨れ等は発生しなかった。Two-layer vinyl chloride resin tube 1 according to Example 3
The adhesive strength when c was used was 25 kg / cm 2 , and no blistering or the like occurred in the outer layer.
【００２２】以上、図により本発明の実施例を説明した
が、本発明の具体的な構成は図に示す実施例に限定され
るものではなく、本発明の要旨を逸脱しない設計変更は
本発明に含まれる。例えば、図示の実施例においては、
１個の温風発生装置が設けられているが、複数個の温風
発生装置が設けられていてもよい。Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration of the present invention is not limited to the embodiments shown in the drawings, and design changes that do not depart from the gist of the present invention can be applied to the present invention. include. For example, in the illustrated embodiment,
Although one warm air generator is provided, a plurality of warm air generators may be provided.
【００２３】[0023]
【発明の効果】請求項１、２記載の本発明熱可塑性樹脂
管の押出成形方法においては、外層の発泡された熱可塑
性樹脂層には水分は残留しないので、その外面に接着剤
を塗布し金属管内に挿入し、加熱により膨張させてライ
ニングすると、優れたライニング管が得られる。In the extrusion molding method for a thermoplastic resin pipe according to the present invention as set forth in claims 1 and 2, since moisture does not remain in the foamed thermoplastic resin layer of the outer layer, an adhesive is applied to the outer surface thereof. An excellent lining tube can be obtained by inserting it into a metal tube, expanding it by heating, and lining it.
【図１】本発明熱可塑性樹脂管の押出成形方法の一実施
態様を示す説明図。FIG. 1 is an explanatory view showing one embodiment of an extrusion molding method for a thermoplastic resin pipe of the present invention.
【図２】本発明熱可塑性樹脂管の押出成形方法の他の一
実施態様を示す説明図。FIG. 2 is an explanatory view showing another embodiment of the extrusion molding method of the thermoplastic resin pipe of the present invention.
【図３】ライニング管を製造する態様を示す断面図。FIG. 3 is a cross-sectional view showing an aspect of manufacturing a lining pipe.
１ メイン押出機 １ａ 発泡樹脂管 １ｂ 非発泡樹脂管 １ｃ 塩化ビニル樹脂管 ２ サブ押出機 ３ ２層押出成形用金型 ４ 冷却水槽 ５ 温風発生装置 ６ 引取機 ７ 切断装置 ８ 溶液槽 ９ 鋼管 1 Main Extruder 1a Foamed Resin Pipe 1b Non-foamed Resin Pipe 1c Vinyl Chloride Resin Pipe 2 Sub Extruder 3 Two-layer Extrusion Mold 4 Cooling Water Tank 5 Hot Air Generator 6 Take-off Machine 7 Cutting Device 8 Solution Tank 9 Steel Pipe
Claims (2)
発泡の熱可塑性樹脂層が設けられ、外層に発泡された熱
可塑性樹脂層が設けられた２層の熱可塑性樹脂管を押出
成形し、この２層の熱可塑性樹脂管を水槽に通過させて
冷却後、温風により外層の発泡された熱可塑性樹脂層に
含浸された水分を乾燥することを特徴とする熱可塑性樹
脂管の押出成形方法。1. A two-layer thermoplastic resin tube using a two-layer extrusion molding die, comprising a non-foamed thermoplastic resin layer as an inner layer and a foamed thermoplastic resin layer as an outer layer. A thermoplastic resin tube characterized by being extrusion-molded, passing the two-layer thermoplastic resin tube through a water tank and cooling, and then drying the moisture impregnated in the foamed thermoplastic resin layer of the outer layer with warm air. Extrusion method.
樹脂管を揮発性溶液が収納された槽内を通過させ、次い
で温風により外層の発泡された熱可塑性樹脂層に含浸さ
れた水分を乾燥することを特徴とする請求項１記載の熱
可塑性樹脂管の押出成形方法。2. A two-layered thermoplastic resin tube introduced into a water tank and cooled is passed through a tank containing a volatile solution, and then impregnated with a foamed thermoplastic resin layer as an outer layer by hot air. The extrusion molding method for a thermoplastic resin pipe according to claim 1, wherein the water content is dried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6110907A JPH07314533A (en) | 1994-05-25 | 1994-05-25 | Extrusion molding method for thermoplastic resin pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6110907A JPH07314533A (en) | 1994-05-25 | 1994-05-25 | Extrusion molding method for thermoplastic resin pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07314533A true JPH07314533A (en) | 1995-12-05 |
Family
ID=14547685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6110907A Pending JPH07314533A (en) | 1994-05-25 | 1994-05-25 | Extrusion molding method for thermoplastic resin pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07314533A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100896677B1 (en) * | 2008-11-10 | 2009-05-14 | 주식회사 고리 | Triple pvc pipe structure of un pb section pipe manufacture system |
| KR101626434B1 (en) * | 2015-05-06 | 2016-06-01 | 주식회사 지니어스코리아 | Manufacturing apparatus for dualindustrial structure of beads and manufacturing method thereof |
-
1994
- 1994-05-25 JP JP6110907A patent/JPH07314533A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100896677B1 (en) * | 2008-11-10 | 2009-05-14 | 주식회사 고리 | Triple pvc pipe structure of un pb section pipe manufacture system |
| KR101626434B1 (en) * | 2015-05-06 | 2016-06-01 | 주식회사 지니어스코리아 | Manufacturing apparatus for dualindustrial structure of beads and manufacturing method thereof |
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