JPH0446216B2 - - Google Patents
Info
- Publication number
- JPH0446216B2 JPH0446216B2 JP27399085A JP27399085A JPH0446216B2 JP H0446216 B2 JPH0446216 B2 JP H0446216B2 JP 27399085 A JP27399085 A JP 27399085A JP 27399085 A JP27399085 A JP 27399085A JP H0446216 B2 JPH0446216 B2 JP H0446216B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- coated steel
- synthetic resin
- cap
- molten resin
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 229920003002 synthetic resin Polymers 0.000 claims description 42
- 239000000057 synthetic resin Substances 0.000 claims description 42
- 229920005989 resin Polymers 0.000 claims description 37
- 239000011347 resin Substances 0.000 claims description 37
- 239000011247 coating layer Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 238000000465 moulding Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003898 horticulture Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
Landscapes
- Supports For Plants (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、農園芸用の支柱やその他の各種の支
柱として汎用されるキヤツプ付き合成樹脂被覆鋼
管の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a synthetic resin-coated steel pipe with a cap, which is commonly used as a support for agriculture and horticulture and other various types of support.
第４図に示したキヤツプ付き合成樹脂被覆鋼管
は、従来、次の方法によつて製造していた。
The synthetic resin coated steel pipe with cap shown in FIG. 4 has conventionally been manufactured by the following method.
即ち、鋼管１の外面にポリ塩化ビニル樹脂等の
合成樹脂よりなる被覆層２を形成した合成樹脂被
覆鋼管３に、これとは別に成形された合成樹脂製
のキヤツプ４を被せると共に、合成樹脂被覆鋼管
３の外周面とキヤツプ４とを接着剤５によつて接
着していた。このようなキヤツプ付き合成樹脂被
覆鋼管は、鋼管１が被覆層２とキヤツプ４とによ
つて外気や雨水等の水分から遮断されるので、鋼
管１の発錆に伴う被覆層２の膨出や剥がれが未然
に防止され、長い耐用寿命を有するものとされて
いる。 That is, a synthetic resin-coated steel pipe 3 with a coating layer 2 made of a synthetic resin such as polyvinyl chloride resin formed on the outer surface of the steel pipe 1 is covered with a synthetic resin cap 4 formed separately, and the synthetic resin coating is also applied. The outer peripheral surface of the steel pipe 3 and the cap 4 were bonded together with an adhesive 5. In such a synthetic resin-coated steel pipe with a cap, the steel pipe 1 is shielded from outside air and moisture such as rainwater by the covering layer 2 and the cap 4, so that the covering layer 2 does not bulge due to rusting of the steel pipe 1. It is said to prevent peeling and have a long service life.
しかし、従来の方法によつて製造されたキヤツ
プ付き合成樹脂被覆鋼管は、上記のように合成樹
脂被覆鋼管３の外周面とキヤツプ４とを接着剤５
によつて接着していたので、接着剤５によつて合
成樹脂被覆鋼管３の外周面とキヤツプ４との間の
隙間が完全に塞がれていなかつたり接着剤５自体
の経時劣化等によつて接着状態が悪くなつたりす
ると、合成樹脂被覆鋼管３の外周面とキヤツプ４
との間の確実な水密性が確保されず、この部分か
ら空気や雨水が浸入して鋼管１を発錆させ、それ
に伴う被覆層の膨出や剥がれを生じさせるおそれ
があつた。また、キヤツプ４が抜け落ちることも
あつた。
However, in the synthetic resin-coated steel pipe with a cap manufactured by the conventional method, the outer circumferential surface of the synthetic resin-coated steel pipe 3 and the cap 4 are bonded together with an adhesive 5 as described above.
Because the adhesive 5 did not completely close the gap between the outer peripheral surface of the synthetic resin-coated steel pipe 3 and the cap 4, or the adhesive 5 itself deteriorated over time, etc. If the adhesive condition deteriorates due to
Reliable watertightness between the steel pipe 1 and the steel pipe 1 could not be ensured, and there was a risk that air and rainwater would enter from this part, causing rusting of the steel pipe 1, and the accompanying bulging or peeling of the coating layer. Also, cap 4 sometimes fell out.
他方、キヤツプ付き合成樹脂被覆鋼管を製造す
る場合には、長尺の合成樹脂被覆鋼管を所定長さ
のものに切断し、その各々に別途成形したキヤツ
プ２を被せていたので、多数のキヤツプをあらか
じめ在庫しておかねばならない不便があつた。さ
らに、接着剤をキヤツプの内面や合成樹脂被覆鋼
管の端部に塗着するときに接着剤の蒸気によつて
作業環境が悪化するという難点もあつた。 On the other hand, when manufacturing synthetic resin-coated steel pipes with caps, a long synthetic resin-coated steel pipe is cut into pieces of a predetermined length, and a separately formed cap 2 is placed on each of the pipes. There was the inconvenience of having to stock it in advance. Furthermore, when the adhesive is applied to the inner surface of the cap or the end of the synthetic resin-coated steel pipe, there is a problem in that the working environment is deteriorated by the vapor of the adhesive.
本発明はこのような問題点を解決するもので、
合成樹脂被覆鋼管とキヤツプとの間の気密性及び
水密性を長期に亘つて確保でき、また、キヤツプ
をあらかじめ成形して在庫したりせずにキヤツプ
付き合成樹脂被覆鋼管を製造できることに加え、
製造時に接着剤の蒸気によつて作業環境が悪化す
るといつた問題点のないキヤツプ付き合成樹脂被
覆鋼管の製造方法を提供することを目的とする。 The present invention solves these problems,
In addition to being able to ensure airtightness and watertightness between the synthetic resin-coated steel pipe and the cap over a long period of time, and being able to manufacture synthetic resin-coated steel pipes with caps without having to pre-form the caps and keep them in stock,
It is an object of the present invention to provide a method for producing a synthetic resin-coated steel pipe with a cap that does not have the problem of deterioration of the working environment due to adhesive vapor during production.
上記目的を達成するため、本発明の製造方法
は、筒状に押し出された溶融樹脂によつて合成樹
脂被覆鋼管の端部を取り囲み、上記被覆鋼管の端
部に対する溶融樹脂の重なり部を上記被覆鋼管の
被覆層に押し付けて該被覆層に溶融樹脂を熱融着
させることと、上記溶融樹脂の中間部を絞つて熱
融着させることと、その絞り部分を切断すること
とを行う点に要旨を有する。
In order to achieve the above object, the manufacturing method of the present invention surrounds the end of a synthetic resin-coated steel pipe with molten resin extruded into a cylindrical shape, and covers the overlapping portion of the molten resin with respect to the end of the coated steel pipe. The gist is that the molten resin is pressed against the coating layer of the steel pipe to heat-seal it to the coating layer, the middle part of the molten resin is squeezed and heat-sealed, and the squeezed part is cut. has.
上記手段によると、絞り部分が切断された溶融
樹脂は、合成樹脂被覆鋼管の端部に対する重なり
部が該被覆鋼管の被覆層に熱融着されることによ
りキヤツプを形成する。従つて、本発明方法によ
つて製造されるキヤツプ付き合成樹脂被覆鋼管
は、キヤツプが合成樹脂被覆鋼管の被覆層に熱融
着されたものとなるから、合成樹脂被覆鋼管とキ
ヤツプとの間の気密性及び水密性が長期に亘つて
確保される。また、本発明方法によると、上記の
ように合成樹脂被覆鋼管にキヤツプを熱融着する
ことと、このキヤツプの成形とが同時に行うこと
が可能になるので、従来のようにあらかじめキヤ
ツプを成形して在庫しておく必要がなく、しか
も、接着剤を用いることもないので、接着剤の蒸
気によつて作業環境が悪化する懸念もない。
According to the above means, the molten resin whose drawn portion has been cut forms a cap by heat-sealing the overlapping portion of the molten resin to the end of the synthetic resin-coated steel pipe to the coating layer of the coated steel pipe. Therefore, in the synthetic resin-coated steel pipe with a cap manufactured by the method of the present invention, the cap is heat-sealed to the coating layer of the synthetic resin-coated steel pipe, so there is no gap between the synthetic resin-coated steel pipe and the cap. Airtightness and watertightness are ensured over a long period of time. Furthermore, according to the method of the present invention, it is possible to heat-seal the cap to the synthetic resin-coated steel pipe as described above and to form the cap at the same time, so that it is possible to form the cap in advance as in the conventional method. There is no need to keep it in stock, and since no adhesive is used, there is no concern that the work environment will be degraded by adhesive vapor.
以下、本発明の実施例を図面を参照して説明す
る。
Embodiments of the present invention will be described below with reference to the drawings.
第１ａ図はサーキユラーダイ１００から溶融樹
脂６を筒状に押し出すと共に、この溶融樹脂６に
よつて合成樹脂被覆鋼管３の端部３１を取り囲ん
だ状態を示している。このような状態を得るため
には、合成樹脂被覆鋼管３をサーキユラーダイ１
００の押出中心の下部に待機させてから溶融樹脂
６を押し出しても、サーキユラーダイ１００から
筒状に押し出された溶融樹脂６に合成樹脂被覆鋼
管３を挿入してもよい。この状態から、合成樹脂
被覆鋼管３の周囲に配置されている成形金型１１
０を型締めする。この型締めにより、第１ｂ図の
ように、合成樹脂被覆鋼管３の端部３１に対する
溶融樹脂６の重なり部６１が上記被覆鋼管３の被
覆層２に押し付けられて熱融着されることと、成
形金型１１０の上端部１１１によつて溶融樹脂６
の中間部が絞られて熱融着されることと、溶融樹
脂６の絞り部分６２を切断することとが同時に行
われる。その結果、溶融樹脂６がキヤツプ状に成
形されると共に、このキヤツプ状の溶融樹脂６と
合成樹脂被覆鋼管３の被覆層６１とにより鋼管１
が気密性及び水密性を保つた状態で完全に覆われ
る。この後に、キヤツプ状の溶融樹脂６を冷却硬
化させることと、成形金型１１０を開放すること
とを行う。 FIG. 1a shows a state in which the molten resin 6 is extruded from the circular die 100 in a cylindrical shape, and the end portion 31 of the synthetic resin-coated steel pipe 3 is surrounded by the molten resin 6. In order to obtain such a state, the synthetic resin coated steel pipe 3 must be placed in a circular die 1.
The molten resin 6 may be extruded after waiting at the lower part of the extrusion center of 00, or the synthetic resin-coated steel pipe 3 may be inserted into the molten resin 6 extruded into a cylinder from the circular die 100. From this state, the molding die 11 placed around the synthetic resin coated steel pipe 3
Clamp 0. By this mold clamping, as shown in FIG. 1b, the overlapping part 61 of the molten resin 6 on the end 31 of the synthetic resin coated steel pipe 3 is pressed against the coating layer 2 of the coated steel pipe 3 and thermally fused. The upper end 111 of the molding die 110 melts the resin 6.
The middle portion of the molten resin 6 is squeezed and heat-sealed, and the squeezed portion 62 of the molten resin 6 is cut at the same time. As a result, the molten resin 6 is formed into a cap shape, and the cap-shaped molten resin 6 and the coating layer 61 of the synthetic resin-coated steel pipe 3 form the steel pipe.
is completely covered in an airtight and watertight manner. After this, the cap-shaped molten resin 6 is cooled and hardened, and the mold 110 is opened.
上記の方法を行う場合に、図示のように成形金
型１１０の型面にリング状の凸部１１２を形成し
ておけば、溶融樹脂６を局部的に被覆層２に強く
押し付けて熱融着することができるから、被覆層
２と溶融樹脂６との間の気密性と水密性とが一層
確実になされる。また、成形金型１１０を型締め
するときに、あらかじめ被覆層２を加熱しておけ
ば、より短時間で確実な熱融着がなされる。 When performing the above method, if a ring-shaped convex portion 112 is formed on the mold surface of the molding die 110 as shown in the figure, the molten resin 6 can be locally strongly pressed against the coating layer 2 and thermally fused. Therefore, the airtightness and watertightness between the coating layer 2 and the molten resin 6 can be further ensured. Moreover, if the coating layer 2 is heated in advance when the molding die 110 is clamped, reliable thermal fusion can be achieved in a shorter time.
次に、成形金型１１０を型締めすることによつ
て切断された溶融樹脂のうち、サーキユラーダイ
１００側に残存する溶融樹脂６は、第２図の実線
で示すように先端部が絞られた状態になるが、こ
の溶融樹脂６は同図中一点鎖線イ−イに沿つて先
端部を切除するか、或いは、矢印Ａ方向にエアブ
ローしてその先端部を仮想線ロで示したように開
放させることによつて、次回のキヤツプ付き合成
樹脂被覆鋼管の製造に備えられる。 Next, among the molten resin cut by clamping the molding die 110, the molten resin 6 remaining on the circular die 100 side is in a state where the tip is squeezed as shown by the solid line in FIG. However, the tip of this molten resin 6 is cut off along the dashed-dotted line A to A in the same figure, or the tip is opened as shown by the imaginary line B by air blowing in the direction of arrow A. This will prepare you for the next production of synthetic resin-coated steel pipes with caps.
上記した実施例では、合成樹脂被覆鋼管３の端
部３１に対する溶融樹脂６の重なり部６１を上記
被覆鋼管３の被覆層２に押し付けて熱融着するこ
とと、溶融樹脂６の中間部を絞つて熱融着するこ
とと、溶融樹脂６の絞り部分６２を切断すること
とを同時に行う例を説明したが、これらの操作は
別々に行つてもよい。 In the embodiment described above, the overlapping part 61 of the molten resin 6 on the end 31 of the synthetic resin-coated steel pipe 3 is pressed against the coating layer 2 of the coated steel pipe 3 and thermally fused, and the middle part of the molten resin 6 is squeezed. Although an example has been described in which heat-sealing and cutting the squeezed portion 62 of the molten resin 6 are performed simultaneously, these operations may be performed separately.
第３図は本発明方法によつて製造されたキヤツ
プ付き合成樹脂被覆鋼管を示している。同図から
も明らかなように、この被覆鋼管は、溶融樹脂の
硬化によつて形成されたキヤツプ６Ａが合成樹脂
被覆鋼管３の被覆層２に一体に熱融着されてい
る。また、キヤツプ６Ａの頂部は、溶融樹脂を絞
つて熱融着させたときに完全に封止されている。
従つて、鋼管１はキヤツプ６Ａと被覆層２とによ
つて確実に空気や水分から遮断されている。 FIG. 3 shows a synthetic resin-coated steel pipe with a cap manufactured by the method of the present invention. As is clear from the figure, in this coated steel pipe, a cap 6A formed by hardening molten resin is integrally heat-sealed to the coating layer 2 of the synthetic resin-coated steel pipe 3. Further, the top of the cap 6A is completely sealed when the molten resin is squeezed and heat-sealed.
Therefore, the steel pipe 1 is reliably isolated from air and moisture by the cap 6A and the coating layer 2.
〔発明の効果〕
以上説明したように、本発明方法によつて製造
されるキヤツプ付き合成樹脂被覆鋼管は、キヤツ
プが合成樹脂被覆鋼管の被覆層に熱融着されたも
のとなり、合成樹脂被覆鋼管とキヤツプとの間の
気密性及び水密性が長期に亘つて確保される。ま
た、本発明方法によると、合成樹脂被覆鋼管にキ
ヤツプを熱融着することと、このキヤツプの成形
とが同時に或いは連続的に行われるので、従来の
ようにあらかじめキヤツプを成形して在庫してお
く必要がない。さらに、製造過程に接着剤を用い
る工程がないので、接着剤の蒸気によつて作業環
境が悪化する懸念もない。[Effects of the Invention] As explained above, in the synthetic resin-coated steel pipe with a cap produced by the method of the present invention, the cap is thermally fused to the coating layer of the synthetic resin-coated steel pipe, and the synthetic resin-coated steel pipe is Airtightness and watertightness between the cap and the cap are ensured over a long period of time. Furthermore, according to the method of the present invention, the heat-sealing of the cap to the synthetic resin-coated steel pipe and the molding of the cap are performed simultaneously or continuously, so unlike the conventional method, the cap is molded in advance and stored. There is no need to leave it there. Furthermore, since there is no process that uses adhesive in the manufacturing process, there is no concern that the working environment will be degraded by adhesive vapor.
第１ａ図及び第１ｂ図は本発明方法の一実施例
を説明するための一部破断側面図、第２図は溶融
樹脂の後処理例を示す説明図、第３図は本発明方
法によつて製造したキヤツプ付き合成樹脂被覆鋼
管の一部破断側面図、第４図は従来方法によつて
製造されたキヤツプ付き合成樹脂被覆鋼管の一部
断面側面図である。
３……合成樹脂被覆鋼管、３１……合成樹脂被
覆鋼管の端部、６……溶融樹脂、６１……合成樹
脂被覆鋼管の端部に対する溶融樹脂の重なり部、
６２……溶融樹脂の絞り部分。
Figures 1a and 1b are partially cutaway side views for explaining one embodiment of the method of the present invention, Figure 2 is an explanatory diagram showing an example of post-treatment of molten resin, and Figure 3 is a side view showing an example of the method of the present invention. FIG. 4 is a partially cutaway side view of a synthetic resin coated steel pipe with a cap manufactured by the conventional method. FIG. 3... Synthetic resin coated steel pipe, 31... End of synthetic resin coated steel pipe, 6... Molten resin, 61... Overlapping part of molten resin with end of synthetic resin coated steel pipe,
62... Squeezed portion of molten resin.
Claims (1)
脂被覆鋼管の端部を取り囲み、上記被覆鋼管の端
部に対する溶融樹脂の重なり部を上記被覆鋼管の
被覆層に押し付けて該被覆層に溶融樹脂を熱融着
させることと、上記溶融樹脂の中間部を絞つて熱
融着させることと、その絞り部分を切断すること
とを行うことを特徴とするキヤツプ付き合成樹脂
被覆鋼管の製造方法。1 Surround the end of the synthetic resin-coated steel pipe with the molten resin extruded into a cylindrical shape, and press the overlapping portion of the molten resin against the end of the coated steel pipe against the coating layer of the coated steel pipe to inject the molten resin into the coating layer. 1. A method for manufacturing a synthetic resin-coated steel pipe with a cap, comprising the steps of heat-sealing the molten resin, squeezing the middle portion of the molten resin to heat-seal it, and cutting the squeezed portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27399085A JPS62132629A (en) | 1985-12-04 | 1985-12-04 | Preparation of capped steel pipe coate with resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27399085A JPS62132629A (en) | 1985-12-04 | 1985-12-04 | Preparation of capped steel pipe coate with resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62132629A JPS62132629A (en) | 1987-06-15 |
| JPH0446216B2 true JPH0446216B2 (en) | 1992-07-29 |
Family
ID=17535403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27399085A Granted JPS62132629A (en) | 1985-12-04 | 1985-12-04 | Preparation of capped steel pipe coate with resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62132629A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100744758B1 (en) | 2006-03-29 | 2007-08-01 | 주식회사 휴스틸 | Pipe capping device |
-
1985
- 1985-12-04 JP JP27399085A patent/JPS62132629A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62132629A (en) | 1987-06-15 |
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