JPH1199560A - Plastic cylindrical molding - Google Patents
Plastic cylindrical moldingInfo
- Publication number
- JPH1199560A JPH1199560A JP9264371A JP26437197A JPH1199560A JP H1199560 A JPH1199560 A JP H1199560A JP 9264371 A JP9264371 A JP 9264371A JP 26437197 A JP26437197 A JP 26437197A JP H1199560 A JPH1199560 A JP H1199560A
- Authority
- JP
- Japan
- Prior art keywords
- plastic
- cylindrical
- shape
- patterns
- mold
- 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
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、表面に擬木状等の
型模様が形成されたプラスチック製筒状成形体に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic cylindrical molded product having a surface pattern such as a pseudo-wood shape.
【0002】[0002]
【従来の技術】公園等の構築物、遊歩道等の柵、擁壁な
どには、金属管を芯材としその表面を擬木状等の型模様
を付与したプラスチックで被覆した筒状複合成形体が使
用されるようになった。2. Description of the Related Art For a building such as a park, a fence of a promenade, a retaining wall, and the like, a cylindrical composite molded body having a metal tube as a core material and the surface of which is covered with plastic having a pattern such as a pseudo-tree shape is used. It was started.
【0003】この種の擬木状の筒状複合成形体は、芯材
である金属管と被覆樹脂層との熱膨張係数が大きく異な
るため、使用中に熱膨張や熱収縮が繰り返されて、被覆
樹脂層に亀裂が発生しやすいという欠点がある。[0003] In this kind of pseudo-tree-like cylindrical composite molded article, the thermal expansion coefficient between the metal tube as the core material and the coating resin layer is greatly different, so that thermal expansion and thermal shrinkage are repeated during use, resulting in a coating. There is a disadvantage that cracks are easily generated in the resin layer.
【0004】このような欠点を改善するために、特開平
8−216276号公報には、肉厚が10〜50mmで長
さが1m以上であるプラスチック製中空成形体の中空部
に、該中空部壁体と空隙を保有させて芯材として金属管
を充填してなるプラスチック製中空成形体が提案されて
いる。In order to improve such disadvantages, Japanese Patent Application Laid-Open No. Hei 8-216276 discloses that a hollow portion of a plastic hollow molded article having a thickness of 10 to 50 mm and a length of 1 m or more is provided. There has been proposed a plastic hollow molded body in which a metal tube is filled as a core material while retaining a wall and a void.
【0005】上記プラスチック製中空成形体は、内面に
擬木状の型模様を有する上下鋳型をを用い、この上下鋳
型を開いた状態でその内部に冷却コアを挿入し、次いで
上下鋳型を閉じ、上下鋳型及び冷却コアに冷却水を通し
て冷却するとともに上下鋳型内に溶融樹脂を注入し、冷
却固化した樹脂から冷却コアを引抜き、上下鋳型を開い
て中空成形体とし、この中空成形体の中に芯材として金
属管を充填して製造されている。[0005] The above-mentioned plastic hollow molded body uses upper and lower molds having a pseudo-wood-shaped pattern on the inner surface. A cooling core is inserted into the upper and lower molds while the upper and lower molds are open, and then the upper and lower molds are closed and Cooling is performed by passing cooling water through the mold and the cooling core, and the molten resin is poured into the upper and lower molds, the cooling core is pulled out of the cooled and solidified resin, and the upper and lower molds are opened to form a hollow molded body. It is manufactured by filling a metal tube.
【0006】[0006]
【発明が解決しようとする課題】上記提案のプラスチッ
ク製中空成形体は、比較的肉厚のプラスチック層があ
り、しかも芯材として金属管を用いるので、重量があり
施工の際の持ち運びに難点があり、また施工中に芯材で
ある金属管がプラスチック層からずれ出て、施工作業性
が悪いという問題がある。また、切断も容易でない。The plastic molded hollow article proposed above has a relatively thick plastic layer and uses a metal tube as a core material, so that it is heavy and difficult to carry during construction. In addition, there is a problem that the metal pipe as the core material is displaced from the plastic layer during the construction, and the construction workability is poor. Also, cutting is not easy.
【0007】また、上記プラスチック製中空成形体は、
上下鋳型を用いる所謂鋳込成形法で得られるものである
から、長さの異なる長尺の製品を得るにはそれに相当す
る寸法の上下鋳型及び冷却コアが必要となり設備費が高
くなり、またプラスチック層が肉厚であることや芯材と
して金属管を用いることにより製造コストが高くなると
いう問題がある。[0007] The plastic hollow molded article is
Since it is obtained by a so-called casting method using upper and lower molds, to obtain long products having different lengths, upper and lower molds and cooling cores of corresponding dimensions are required, and equipment costs increase, and plastic There is a problem that the production cost increases due to the thickness of the layer and the use of a metal tube as the core material.
【0008】本発明は、上記の問題を解決するもので、
その目的とするところは、使用中に亀裂が発生せず、し
かも軽量で施工作業性が良く、また安価に製造でき、さ
らに切断して半割り状や平板状に後加工することが容易
で、表面に擬木状等の型模様が形成されたプラスチック
製筒状成形体を提供することにある。The present invention solves the above problems,
Its purpose is that it does not crack during use, it is lightweight and has good workability, it can be manufactured at low cost, and it is easy to cut and post-process it into a half-split shape or flat plate shape, An object of the present invention is to provide a plastic cylindrical molded body having a surface pattern such as a pseudo-wood shape.
【0009】[0009]
【課題を解決するための手段】本発明のプラスチック製
筒状成形体は、表面に擬木状等の型模様が形成され、肉
厚が5〜10mmのプラスチックからなる筒状成形体で
あって、該筒状成形体は、筒状芯体の表面にプラスチッ
クを溶融押出し被覆し、被覆樹脂が軟化状態にある間に
擬木状等の型模様を有する型付けロールにより連続的に
型付けを行い、その後上記筒状芯体を引抜くことにより
筒状に成形されたものであることを特徴とし、それによ
り上記の目的を達成することができる。Means for Solving the Problems The plastic cylindrical molded article of the present invention is a cylindrical molded article made of plastic having a thickness of 5 to 10 mm with a pattern such as a pseudo-wood shape formed on the surface thereof. The cylindrical molded body is formed by melting and extruding plastic onto the surface of the cylindrical core body, and while the coating resin is in a softened state, performing continuous molding with a molding roll having a mold pattern such as a pseudo-wood shape. It is characterized by being formed into a tubular shape by pulling out a tubular core body, whereby the above object can be achieved.
【0010】[0010]
【作用】本発明のプラスチック製筒状成形体は、肉厚が
5〜10mmで比較的肉厚が薄く、しかも金属管によう
な芯材を使用しないので、使用中に熱膨張や熱収縮が繰
り返されてもプラスチックに亀裂が発生することはな
く、しかも軽量で芯材がずれるようなトラブルはなく、
施工作業性が良好である。また、比較的肉厚で芯材がな
いので、材料費が安く、切断等により半割り状及び平板
状の製品に後加工するのが容易となる。The plastic cylindrical molded article of the present invention has a thickness of 5 to 10 mm, is relatively thin, and does not use a core material such as a metal tube. Even if it is repeated, there is no crack in the plastic, and there is no trouble that the core material is shifted with light weight,
Construction workability is good. Further, since the core material is relatively thick and the core material is not used, the material cost is low, and it is easy to post-process the product into a half-split shape and a flat shape by cutting.
【0011】さらに、本発明のプラスチック製筒状成形
体は、筒状芯体にプラスチックを押出被覆する工程と型
付けロールによる型付け工程と筒状芯体の引抜き工程と
により得られるので、上下鋳型を用いる鋳込成形法で得
られるものに比べ、同じ設備で長さの異なる長尺の製品
を得ることが可能で、設備費が安くなる。また、肉厚が
5〜10mmで比較的肉厚が薄いので、成形歪みが小さ
く、筒状芯体は被覆樹脂層から容易に引抜くことができ
る。Furthermore, the plastic cylindrical molded article of the present invention can be obtained by a step of extruding and coating a plastic on a cylindrical core, a step of molding with a molding roll, and a step of drawing out the cylindrical core. Compared to those obtained by the casting method used, long products having different lengths can be obtained with the same equipment, and equipment costs are reduced. In addition, since the thickness is relatively small, that is, 5 to 10 mm, the molding distortion is small, and the cylindrical core can be easily pulled out from the coating resin layer.
【0012】[0012]
【発明の実施の形態】以下、図面に示す実施例を参照し
ながら、本発明を詳しく説明する。図1は本発明のプラ
スチック製筒状成形体の一例を示す一部切欠斜視図であ
り、図2は本発明のプラスチック製筒状成形体の製造方
法の一例を示す説明図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1 is a partially cutaway perspective view showing an example of a plastic tubular molded article of the present invention, and FIG. 2 is an explanatory view showing an example of a method for producing a plastic tubular molded article of the present invention.
【0013】図1において、10は本発明のプラスチッ
ク製筒状成形体であって、11はその表面に形成された
擬木状等の型模様である。ここで、プラスチックとして
は、ポリエチレン、エチレン−酢酸ビニル共重合体、塩
化ビニル樹脂等の熱可塑性樹脂が用いられる。また、こ
れ等の熱可塑性樹脂には、木粉、短繊維、無機充填剤、
着色剤、発泡剤、耐候性改良剤、その他の配合剤が添加
されてもよい。In FIG. 1, reference numeral 10 denotes a plastic cylindrical molded body of the present invention, and reference numeral 11 denotes a pseudo-wood-like pattern formed on the surface thereof. Here, as the plastic, a thermoplastic resin such as polyethylene, ethylene-vinyl acetate copolymer, and vinyl chloride resin is used. In addition, these thermoplastic resins include wood flour, short fibers, inorganic fillers,
A coloring agent, a foaming agent, a weather resistance improving agent, and other compounding agents may be added.
【0014】表面に形成される型模様は、擬木状をはじ
め竹状、石状、モザイク状、スクリュー状など型付け可
能な種々の立体感のある型模様が採用される。また、筒
状成形体10は断面が円形のみならず、楕円形や四角形
などであってもよい。As the pattern pattern formed on the surface, various pattern patterns having various three-dimensional appearances such as bamboo-like, stone-like, mosaic-like, screw-like, etc. are adopted. Further, the cross-section of the cylindrical molded body 10 may be not only circular but also elliptical or square.
【0015】そして、プラスチック製筒状成形体10の
肉厚は5〜10mmとされる。この肉厚が5mmを下回
ると機械的強度が低下し、逆に10mmを越えると材料
費が高くなるばかりか、成形歪みが大きくなり、プラス
チック製筒状成形体10の成形の際に被覆樹脂層から筒
状芯体を引抜き難くなり、また切断により半割り状又は
平板状の製品に後加工するのが難しくなる。ここで、上
記肉厚は型模様を含む全体の肉厚を指す。The thickness of the plastic cylindrical molded body 10 is 5 to 10 mm. When the thickness is less than 5 mm, the mechanical strength is reduced. On the contrary, when the thickness is more than 10 mm, not only the material cost is increased but also the molding distortion is increased, and the coating resin layer is formed at the time of molding the plastic cylindrical molded body 10. It becomes difficult to pull out the cylindrical core from the slab, and it becomes difficult to post-process the product into a half-split or flat product by cutting. Here, the thickness refers to the entire thickness including the pattern.
【0016】このような本発明のプラスチック製筒状成
形体10は、図2に示すように、クロスヘッド型金型2
1を付設したスクリュー押出機20を用い、このクロス
ヘッド型金型21に金属管のような筒状芯体30を導入
ながら、スクリュー押出機20からクロスヘッド型金型
21へプラスチックを溶融押出し、クロスヘッド型金型
21内で筒状芯体30の表面にプラスチックを溶融被覆
して、被覆樹脂層10aを形成する。As shown in FIG. 2, the plastic cylindrical molded article 10 of the present invention is a cross-head mold 2.
1, a plastic extruder is melt-extruded from the screw extruder 20 to the crosshead mold 21 while introducing a cylindrical core 30 such as a metal tube into the crosshead mold 21 using the screw extruder 20 provided with Plastic is melt-coated on the surface of the cylindrical core body 30 in the crosshead mold 21 to form a coating resin layer 10a.
【0017】次いで、プラスチックが被覆された筒状芯
体30は、冷却装置40により被覆樹脂層10aの温度
が樹脂の軟化温度まで冷却調節され、被覆樹脂層10a
が軟化状態にある間に、擬木状等の型模様を有する一対
の型付けロール50の間に通され、そこで被覆樹脂層1
0aの表面に擬木状等の型模様11が連続的に型付けさ
れる。一対の型付けロール50はいずれも鼓状のもの
で、被覆樹脂層10aは筒状芯体30により支持されて
いるので、型付けは容易である。Next, the temperature of the coating resin layer 10a is controlled to be cooled to the softening temperature of the resin by the cooling device 40, and the coating resin layer 10a is cooled.
Is in a softened state, is passed between a pair of molding rolls 50 having a pattern such as a pseudo-wood shape, where the coating resin layer 1 is formed.
A pattern 11 such as a pseudo-tree shape is continuously formed on the surface of Oa. Each of the pair of molding rolls 50 has a drum shape, and the coating resin layer 10a is supported by the cylindrical core 30, so that the molding is easy.
【0018】その後、被覆樹脂層10aから筒状芯体3
0を引抜くことにより、筒状に成形される。被覆樹脂層
10aから筒状芯体30を引抜くには、予め筒状芯体3
0の表面をシリコン系離型剤やフッ素系離型剤で処理
し、さらに潤滑油を塗布しておき、被覆樹脂層10aの
表面を滑り止め性の良好なゴムを装着した固定具で固定
しておき、筒状芯体30のみを適当な引張り器具具を用
いて引張ることにより、容易に筒状芯体30が引抜かれ
る。Thereafter, the cylindrical core 3 is removed from the coating resin layer 10a.
By drawing 0, it is formed into a cylindrical shape. In order to pull out the cylindrical core 30 from the coating resin layer 10a, the cylindrical core 3
The surface of No. 0 is treated with a silicone-based release agent or a fluorine-based release agent, lubricating oil is further applied, and the surface of the coating resin layer 10a is fixed with a fixing device equipped with a rubber with good non-slip properties. The tubular core 30 is easily pulled out by pulling only the tubular core 30 using an appropriate tensioning tool.
【0019】その他、筒状芯体30を縮小可能な割り型
で構成し、この割り型を縮小して筒状芯体30を引抜く
ようにしてもよい。こうして、表面に擬木状等の型模様
11が形成されたプラスチック製筒状成形体10が得ら
れる。In addition, the cylindrical core 30 may be constituted by a split mold that can be reduced, and the split core may be reduced to pull out the cylindrical core 30. In this way, a plastic cylindrical molded body 10 having the surface on which the pattern 11 such as a pseudo-tree shape is formed is obtained.
【0020】本発明のプラスチック製筒状成形体10
は、適当な長さに切断し、これを多数本並べたり組み合
わせたりして、例えば公園等の構築物、遊歩道等の柵、
擁壁などに使用される。この場合、プラスチック製筒状
成形体10の上端又は両端には、通常、キャップが被せ
られる。The plastic cylindrical molded body 10 of the present invention
Is cut into a suitable length, and a large number of them are arranged or combined to construct, for example, parks, fences such as promenades, etc.
Used for retaining walls. In this case, a cap is usually put on the upper end or both ends of the plastic cylindrical molded body 10.
【0021】また、本発明のプラスチック製筒状成形体
10は、肉厚が比較的薄く金属管のような芯材がないの
で加工しやすく、これを切断して半割り状又は平板状の
製品に後加工して、壁材や屋根材などに使用することが
できる。Further, the plastic cylindrical molded body 10 of the present invention has a relatively small thickness and does not have a core material such as a metal tube, so that it is easy to process. Afterwards, it can be used for wall materials and roof materials.
【0022】[0022]
【発明の効果】本発明のプラスチック製筒状成形体は、
上述のように構成されているので、使用中に亀裂が発生
せず、しかも軽量で施工作業性が良く、また安価に製造
でき、さらに半割り状や平板状に後加工が容易で、表面
に擬木状等の型模様が形成されているので、公園等の構
築物、遊歩道等の柵、擁壁、壁材や屋根材など広範の用
途に使用することができる。The plastic molded article of the present invention is
Because it is configured as described above, it does not crack during use, and it is lightweight, has good workability, and can be manufactured at low cost. Since the imitation wood-like pattern is formed, it can be used in a wide range of applications such as structures such as parks, fences such as promenades, retaining walls, wall materials and roof materials.
【図1】本発明のプラスチック製筒状成形体の一例を示
す一部切欠斜視図である。FIG. 1 is a partially cutaway perspective view showing an example of a plastic cylindrical molded body of the present invention.
【図2】本発明のプラスチック製筒状成形体の製造方法
の一例を示す説明図である。FIG. 2 is an explanatory view showing an example of a method for producing a plastic cylindrical molded body of the present invention.
10 プラスチック製筒状成形体 10a 被覆樹脂層 11 擬木状等の型模様 20 スクリュー押出機 21 クロスヘッド型金型 30 筒状芯体 40 冷却装置 50 型付けロール DESCRIPTION OF SYMBOLS 10 Plastic cylindrical molded body 10a Coating resin layer 11 Pseudo wood-like pattern 20 Screw extruder 21 Cross head type mold 30 Cylindrical core body 40 Cooling device 50 Molding roll
Claims (1)
厚が5〜10mmのプラスチックからなる筒状成形体で
あって、該筒状成形体は、筒状芯体の表面にプラスチッ
クを溶融押出し被覆し、被覆樹脂が軟化状態にある間に
擬木状等の型模様を有する型付けロールにより連続的に
型付けを行い、その後上記筒状芯体を引抜くことにより
筒状に成形されたものであることを特徴とするプラスチ
ック製筒状成形体。1. A cylindrical molded body made of plastic having a pattern such as a pseudo-wood shape formed on the surface thereof and having a thickness of 5 to 10 mm, wherein the cylindrical molded body has a plastic core on the surface of a cylindrical core. Was melt-extruded and coated, while the coating resin was in a softened state, continuously molded by a molding roll having a mold pattern such as a pseudo-wood shape, and then formed into a tubular shape by pulling out the tubular core body. A cylindrical molded article made of plastic, characterized in that:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26437197A JP3661913B2 (en) | 1997-09-29 | 1997-09-29 | Method for producing plastic cylindrical molded body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26437197A JP3661913B2 (en) | 1997-09-29 | 1997-09-29 | Method for producing plastic cylindrical molded body |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1199560A true JPH1199560A (en) | 1999-04-13 |
JP3661913B2 JP3661913B2 (en) | 2005-06-22 |
Family
ID=17402233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26437197A Expired - Fee Related JP3661913B2 (en) | 1997-09-29 | 1997-09-29 | Method for producing plastic cylindrical molded body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3661913B2 (en) |
-
1997
- 1997-09-29 JP JP26437197A patent/JP3661913B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3661913B2 (en) | 2005-06-22 |
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