JPH04208441A - Manufacture of fire resisting heat insulating pipe - Google Patents
Manufacture of fire resisting heat insulating pipeInfo
- Publication number
- JPH04208441A JPH04208441A JP34059590A JP34059590A JPH04208441A JP H04208441 A JPH04208441 A JP H04208441A JP 34059590 A JP34059590 A JP 34059590A JP 34059590 A JP34059590 A JP 34059590A JP H04208441 A JPH04208441 A JP H04208441A
- Authority
- JP
- Japan
- Prior art keywords
- heat insulating
- tubular body
- heat
- insulating layer
- sheet
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229920000098 polyolefin Polymers 0.000 claims abstract description 38
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 239000006260 foam Substances 0.000 claims description 29
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 24
- 239000003063 flame retardant Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 239000012793 heat-sealing layer Substances 0.000 claims 2
- 239000010410 layer Substances 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 19
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 7
- 238000005187 foaming Methods 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 20
- 239000011347 resin Substances 0.000 description 20
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 230000037303 wrinkles Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 229910010272 inorganic material Inorganic materials 0.000 description 4
- 239000011147 inorganic material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000007499 fusion processing Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明は、給湯、給水、冷媒配管等に用いられる難燃性
断熱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 manufacturing flame-retardant heat-insulated pipes used for hot water supply, water supply, refrigerant piping, etc.
[従来の技術]
従来より高発泡ポリオレフィン材料は、優れた断熱性お
よび加工性を呈するために断熱管の断熱材料として用い
られている。[Prior Art] Highly foamed polyolefin materials have been used as heat insulating materials for heat insulating pipes since they exhibit excellent heat insulating properties and processability.
通常、金属管や樹脂管等の管状体に高発泡ポリオレフィ
ン材料を断熱層として被覆する方法としては、第1の方
法として、あらかじめ高発泡ポリオレフィン材料を管状
体の外径よりも僅かに大きい内径を有する樹脂環状体に
成形しておき、断熱管の敷設現場においてこの樹脂環状
体を管状体に被覆加工するか、あるいは断熱管の製造工
場においてこの樹脂環状体に管状体を挿入する方法、ま
たは、第2の方法として、管状体に高発泡ポリエチレン
材料からなるシートを縦添えし、このシートの長さ方向
に沿った当接部を管状体表面上で加熱融着して断熱層を
形成する方法等が用いられている。第2の方法は、長尺
の断熱管が製造でき、均一な品質で製造できるので多用
されてきている。Normally, the first method of coating a tubular body such as a metal pipe or a resin pipe with a highly foamed polyolefin material as a heat insulating layer is to coat the highly foamed polyolefin material in advance with an inner diameter slightly larger than the outer diameter of the tubular body. A method in which the resin annular body is molded into a resin annular body having a resin annular body and the tubular body is coated with the resin annular body at the installation site of the insulated pipe, or the tubular body is inserted into the resin annular body at the insulated pipe manufacturing factory, or The second method is to vertically attach a sheet made of highly foamed polyethylene material to a tubular body, and heat-fuse the contact portion along the length of the sheet on the surface of the tubular body to form a heat insulating layer. etc. are used. The second method has been widely used because long insulated pipes can be manufactured with uniform quality.
この第2の方法の一般的な工程を第2図に示す。The general steps of this second method are shown in FIG.
まず、管状体送り出し工程31において、管状体送り出
し装置から管状体を引き出し、縦添え工程32において
、シート供給装置から供給されたポリオレフィン発泡体
シートを管状体に縦添え配置する。このとき、このシー
トが管状体の所定位置に縦添え配置されるように案内ガ
イドを通す。次いで、環状フォーミング工程33におい
て、管状体が包被されるようにポリオレフィン発泡体を
フォーミング治具で成型して略環状の断熱層を形成する
。次に、加熱融着工程34において、断熱層の当接部を
加熱融着し、円筒ダイ成形工程35において、この管状
体を円筒ダイに通して断熱層の環状形状を安定化する。First, in a tubular body delivery step 31, the tubular body is pulled out from the tubular body delivery device, and in a vertical attachment step 32, a polyolefin foam sheet supplied from a sheet supply device is longitudinally attached to the tubular body. At this time, the sheet is passed through the guide so that it is placed vertically at a predetermined position on the tubular body. Next, in an annular forming step 33, the polyolefin foam is formed using a forming jig so as to cover the tubular body to form a substantially annular heat insulating layer. Next, in a heat fusing step 34, the abutting portions of the heat insulating layer are heat welded, and in a cylindrical die forming step 35, this tubular body is passed through a cylindrical die to stabilize the annular shape of the heat insulating layer.
その後、巻取工程36において、断熱層が設けられた断
熱管を巻き取る。Thereafter, in a winding step 36, the heat insulating tube provided with the heat insulating layer is rolled up.
[発明が解決しようとする課題]
しかしながら、管状体は製造ラインでは走行しているの
で、円筒ダイ成形工程35において円筒ダイと断熱層と
の間に摩擦が生じ、そこで断熱層に負荷がかかる。一方
、巻取工程36において断熱層が設けられた管状体には
巻取による引張りの負荷がかかる。この2種類の負荷の
ため断熱層り伸びてしまう。このため、負荷が除かれた
状態では、断熱管の断熱層にシワが発生したり、第3図
に示すように断熱層の復元力により断熱層41か収縮し
管状体44が露出してしまい、それにより製造の歩留り
が低下する。[Problems to be Solved by the Invention] However, since the tubular body is running on the production line, friction occurs between the cylindrical die and the heat insulating layer in the cylindrical die forming step 35, and a load is applied to the heat insulating layer. On the other hand, in the winding step 36, the tubular body provided with the heat insulating layer is subjected to a tensile load due to winding. These two types of loads cause the insulation layer to stretch. For this reason, when the load is removed, wrinkles may occur in the heat insulating layer of the heat insulating pipe, or the restoring force of the heat insulating layer may cause the heat insulating layer 41 to contract, exposing the tubular body 44, as shown in FIG. , which reduces manufacturing yield.
一方、近年の防災強化のために、断熱管の断熱層にはよ
り高い難燃性が要求される。このため、発泡ポリオレフ
ィンに無機物を充填した、いわゆる無機物充填ポリオレ
フィン発泡体を断熱材料として使用することが望まれて
いる。無機物充填ポリオレフィン発泡体は、無機物を多
量に充填することによりポリオレフィン発泡体の難燃性
を向上させることができる。しかし、無機物とベース樹
脂との密着性が悪いと、高い発泡倍率を確保することが
できず、優れた難燃性を発揮させることもできなくなる
。このため、無機物とベース樹脂が充分に密着するよう
に比較的柔らかい、伸びの大きなベース樹脂を用いるこ
とが好ましい。このようなベース樹脂として、エチレン
−酢酸ビニル共重合体、エチレン−エチルアクリレート
共重合体等が使用される。On the other hand, in order to strengthen disaster prevention in recent years, higher flame retardancy is required for the insulation layer of insulation pipes. For this reason, it is desired to use a so-called inorganic-filled polyolefin foam, which is a foamed polyolefin filled with an inorganic material, as a heat insulating material. The inorganic-filled polyolefin foam can improve the flame retardancy of the polyolefin foam by filling it with a large amount of inorganic material. However, if the adhesion between the inorganic substance and the base resin is poor, a high expansion ratio cannot be ensured, and excellent flame retardancy cannot be exhibited. For this reason, it is preferable to use a base resin that is relatively soft and has a high elongation so that the inorganic substance and the base resin are sufficiently adhered to each other. As such a base resin, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, etc. are used.
しかしながら、このようなベース樹脂の無機物充填ポリ
オレフィン発泡体を用いて上記第2の方法で断熱管を製
造すると、加熱融着工程において加熱融着部が軟化し、
第3図に示すように、断熱管40の断熱層41の加熱融
着部42近傍に融着面に垂直な方向に大きなシワ43が
発生する。また、断熱管の断熱層のみが収縮して、管状
体が露出してしまい、それにより断熱管の外観が悪くな
り、製造の歩留りが一層低下する。However, when an insulated pipe is manufactured by the second method using such an inorganic-filled polyolefin foam as a base resin, the heat-fused portion becomes soft during the heat-fusion process.
As shown in FIG. 3, large wrinkles 43 are generated in the vicinity of the heat-fused portion 42 of the heat-insulating layer 41 of the heat-insulating pipe 40 in a direction perpendicular to the fused surface. Moreover, only the heat insulating layer of the heat insulating tube contracts, exposing the tubular body, which deteriorates the appearance of the heat insulating tube and further reduces the manufacturing yield.
本発明はかかる点に鑑みてなされたものであり、優れた
難燃性を発揮する断熱管を簡単に、しかも効率よく製造
することができる難燃性断熱管の製造方法を提供するこ
とを目的とする。The present invention has been made in view of the above, and an object of the present invention is to provide a method for manufacturing a flame-retardant insulated pipe that can easily and efficiently manufacture an insulated pipe that exhibits excellent flame retardancy. shall be.
[課題を解決するための手段]
本発明は、管状体に難燃性ポリオレフィン発泡体シート
を縦添え配置する工程と、該難燃性ポリオレフィン発泡
体シートの外側に補強シートを縦添え配置する工程と、
該管状体を包被する゛ように該2つのシートを成型して
略円筒状の難燃性断熱層を形成する工程と、該難燃性断
熱層の長手方向に沿った当接部を加熱融着する工程と、
加熱融着後の該難燃性断熱層の形状を安定化する工程と
、該補強シートを分離回収する工程とを具備することを
特徴とする難燃性断熱管の製造方法を提供する。[Means for Solving the Problems] The present invention comprises a step of arranging a flame-retardant polyolefin foam sheet vertically on a tubular body, and a step of arranging a reinforcing sheet longitudinally on the outside of the flame-retardant polyolefin foam sheet. and,
forming a substantially cylindrical flame-retardant heat insulating layer by molding the two sheets so as to cover the tubular body; and heating a contact portion along the longitudinal direction of the flame-retardant heat insulating layer. A process of fusing,
Provided is a method for producing a flame-retardant heat-insulating pipe, which comprises the steps of: stabilizing the shape of the flame-retardant heat-insulating layer after heat fusion; and separating and recovering the reinforcing sheet.
ここで、管状体としては、鋼管、アルミニウム管、ステ
ンレス管等の金属管、ポリエチレン管、ポリブテン管等
の樹脂管が使用される。このなかで、長尺の取扱いが容
易であり、耐食性および加工性に優れる鋼管が特に好ま
しい。Here, as the tubular body, metal pipes such as steel pipes, aluminum pipes, and stainless steel pipes, and resin pipes such as polyethylene pipes and polybutene pipes are used. Among these, steel pipes are particularly preferred because they are easy to handle in long lengths and have excellent corrosion resistance and workability.
無機充填ポリオレフィン発泡体のベース樹脂としては、
エチレン−酢酸ビニル共重合体、エチレン−エチルアク
リレート共重合体、エチレン−プロピレン共重合体、エ
チレン−酢酸ビニル−塩化ビニル共重合体等が使用され
る。The base resin for inorganic-filled polyolefin foam is
Ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate-vinyl chloride copolymer, etc. are used.
無機充填ポリオレフィン発泡体に充填する無機物として
は、水酸化アルミニウム、水酸化マグネシウム、塩基性
炭酸マグネシウム等が使用される。As the inorganic substance filled in the inorganic-filled polyolefin foam, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, etc. are used.
また、これらの無機物の充填量は、ベース樹脂100重
量部に対して100〜200重量部であることが好まし
い。これは、無機物の充填量がべ−ス樹脂100重量部
に対して100重量部未満であると得られた発泡体が充
分な難燃性を発揮せず、無機物の充填量がベース樹脂1
00重量部に対して200重量部を超えると所定の発泡
倍率が確保できなくなるとともに、機械的強度の低下も
大きくなるからである。Moreover, it is preferable that the filling amount of these inorganic substances is 100 to 200 parts by weight based on 100 parts by weight of the base resin. This is because if the inorganic content is less than 100 parts by weight based on 100 parts by weight of the base resin, the obtained foam will not exhibit sufficient flame retardancy.
This is because if the amount exceeds 200 parts by weight relative to 00 parts by weight, a predetermined expansion ratio cannot be ensured, and the mechanical strength will also decrease significantly.
無機充填ポリオレフィン発泡体の発泡倍率は20〜40
倍であることが好ましい。これは、発泡倍率が20倍未
満であると断熱性能の低下を招き、発泡倍率が40倍を
超えると機械的強度が小さくなるからである。The expansion ratio of inorganic filled polyolefin foam is 20-40
Preferably, it is twice as large. This is because if the expansion ratio is less than 20 times, the heat insulation performance will deteriorate, and if the expansion ratio exceeds 40 times, the mechanical strength will decrease.
また、本発明においては、断熱層の耐候性および機械的
強度の向上、並びに断熱管の施工性を向上させるために
、断熱層の表面に他のポリオレフィンシートを被覆して
もよい。この場合、外観をよくするためにポリオレフィ
ンシートの表面にあらかじめエンボス加工を施しておい
てもよい。Further, in the present invention, the surface of the heat insulating layer may be coated with another polyolefin sheet in order to improve the weather resistance and mechanical strength of the heat insulating layer and to improve the workability of the heat insulating pipe. In this case, the surface of the polyolefin sheet may be embossed in advance to improve its appearance.
補強シートとしては、銅テープ、アルミニウムテープ等
の金属テープ、金属と樹脂との複合テープ等が使用され
る。補強シートは、走行する管状体と円筒ダイとの間に
摩擦による伸びを最小にするために少なくともアルミニ
ウム程度の弾性率を有することが好ましい。また、補強
シートは、ポリオレフィン発泡体シートと共に円筒ダイ
を通過することができるために小さい曲げ弾性、率を有
することが好ましい。また、補強シートの厚さは、0.
1■以下であることが好ましい。これは、補強シートの
厚さが0.11を超えると円筒ダイを通過しにくくなり
、ポリオレフィン発泡シートの加熱融着品質にも悪影響
を及ぼすからである。As the reinforcing sheet, metal tapes such as copper tapes and aluminum tapes, composite tapes of metal and resin, and the like are used. The reinforcing sheet preferably has an elastic modulus at least as high as aluminum in order to minimize elongation due to friction between the traveling tubular body and the cylindrical die. The reinforcing sheet also preferably has a low bending modulus so that it can pass through a cylindrical die along with the polyolefin foam sheet. Moreover, the thickness of the reinforcing sheet is 0.
It is preferable that it is 1■ or less. This is because if the thickness of the reinforcing sheet exceeds 0.11, it will be difficult to pass through the cylindrical die, and this will have a negative effect on the heat-sealing quality of the polyolefin foam sheet.
[作用]
本発明の難燃性断熱管の製・遣方法によれば、管状体を
包被するように無機物充填ポリオレフィンシート発泡体
を成型して略円筒状の断熱層に形成し、その断熱層の当
接部を加熱融着し、加熱融着後の断熱層の形状を安定化
するまで、無機物充填ポリオレフィン発泡体シートの外
側に補強シートを配置一体化している。[Function] According to the method for manufacturing and using a flame-retardant heat-insulating pipe of the present invention, an inorganic-filled polyolefin sheet foam is formed into a substantially cylindrical heat-insulating layer so as to cover a tubular body, and the heat-insulating layer is formed into a substantially cylindrical heat-insulating layer. A reinforcing sheet is placed and integrated on the outside of the inorganic-filled polyolefin foam sheet until the abutting portions of the layers are heat-fused and the shape of the heat-fused heat-insulating layer is stabilized.
このため、補強シートが円筒ダイとの摩擦や巻き取りに
より引張り荷重等の断熱層にかかる負荷を充分に緩和す
る。これにより、断熱層の伸びを防止することができ、
シワの発生や断熱層の収縮を防止することができる。し
たがって、外観が良好な難燃性断熱管が得られる。Therefore, the reinforcing sheet sufficiently alleviates the load, such as tensile load, applied to the heat insulating layer due to friction with the cylindrical die or winding. This prevents the insulation layer from stretching.
It is possible to prevent wrinkles and shrinkage of the heat insulating layer. Therefore, a flame-retardant heat-insulating pipe with a good appearance can be obtained.
[実施例]
以下、本発明の実施例について図面を参照して具体的に
説明する。[Examples] Examples of the present invention will be specifically described below with reference to the drawings.
第1図は本発明にかかる方法に使用される製造装置の概
略説明図である。図中10は管状体コイルを示す。まず
、管状体コイル10から管状体11を引き出し走行させ
て断熱管製造ラインに供給する。この管状体11にライ
ン外に設置されている無機物充填ポリオレフィン発泡体
シート用コイル12に巻き付けられた無機物充填ポリオ
レフィン発泡体シート13を引き出して管状体11に縦
添え配置する。これにライン外に設置されている補強シ
ート用コイル14に巻き付けられた補強シート15を引
き出して無機物充填ポリオレフィン発泡体シート13の
外側に縦添え配置する。次いで、2枚のシートを縦添え
配置した管状体11を案内ガイド16に通して2枚のシ
ートを管状体の外周面の所定の位置に配置する。その後
、これをユニット17に通す。FIG. 1 is a schematic explanatory diagram of a manufacturing apparatus used in the method according to the present invention. In the figure, 10 indicates a tubular body coil. First, the tubular body 11 is pulled out from the tubular body coil 10 and run to be supplied to an insulated tube manufacturing line. The inorganic material-filled polyolefin foam sheet 13 wound around the inorganic material-filled polyolefin foam sheet coil 12 installed outside the line on the tubular body 11 is pulled out and placed longitudinally on the tubular body 11. The reinforcing sheet 15 wound around the reinforcing sheet coil 14 installed outside the line is pulled out and placed vertically on the outside of the inorganic substance-filled polyolefin foam sheet 13. Next, the tubular body 11 in which the two sheets are arranged vertically is passed through the guide 16, and the two sheets are placed at predetermined positions on the outer peripheral surface of the tubular body. Thereafter, it is passed through unit 17.
ユニット17においては、管状体11が包被されるよう
にフォーミング治具で無機物充填ポリオレフィン発泡体
シート13を成型して略円筒状の断熱層を形成する。次
いで、管状体11の外周に設けられた断熱層の当接部を
加熱手段(図示せず)により加熱融着する。加熱手段と
しては、熱風、電気ゴテ等が用いられる。なお、このと
き、断熱層の当接部の周辺領域に補強シート15が存在
すると加熱融着を妨げるので、補強シート15は断熱層
の当接部の予定領域以外の部分に縦添え配置する必要が
ある。その後、断熱層が設けられた管状体11を円筒ダ
イに通して加熱融着後の断熱層の形状を円筒状に安定化
する。このとき、断熱層の外側には補強シート15が配
置されているので、断熱層と円筒ダイと接触しない。こ
のため、断熱層を設けた管状体11を円筒ダイに通して
も、断熱層が伸びない。したがって、得られる難燃性断
熱管の断熱層にシワや収縮は発生しない。In the unit 17, the inorganic-filled polyolefin foam sheet 13 is formed using a forming jig so as to cover the tubular body 11, thereby forming a substantially cylindrical heat insulating layer. Next, the contact portion of the heat insulating layer provided on the outer periphery of the tubular body 11 is heated and fused by a heating means (not shown). As the heating means, hot air, electric iron, etc. are used. Note that at this time, if the reinforcing sheet 15 exists in the area around the abutting part of the heat insulating layer, it will impede heat fusion, so the reinforcing sheet 15 needs to be placed vertically in a part other than the planned area of the abutting part of the insulating layer. There is. Thereafter, the tubular body 11 provided with the heat insulating layer is passed through a cylindrical die to stabilize the heat fused heat insulating layer into a cylindrical shape. At this time, since the reinforcing sheet 15 is placed outside the heat insulating layer, the heat insulating layer does not come into contact with the cylindrical die. Therefore, even if the tubular body 11 provided with a heat insulating layer is passed through a cylindrical die, the heat insulating layer does not expand. Therefore, wrinkles and shrinkage do not occur in the heat insulating layer of the resulting flame-retardant heat-insulated pipe.
その後、ユニット17において断熱層を設けた管状体1
1を駆動ロール18に通した後、補強シート15を分離
回収して難燃性断熱管19として断熱管巻取コイル20
に巻き取る。断熱層を設けた管状体11を駆動ロール1
8に通す場合、断熱層を保護するために、補強シート1
5を被覆した部分が駆動ロール18に接するするように
通す必要がある。After that, in the unit 17, the tubular body 1 provided with the heat insulating layer
1 is passed through a drive roll 18, the reinforcing sheet 15 is separated and collected, and a heat-insulating pipe winding coil 20 is made into a flame-retardant heat-insulating pipe 19.
Wind it up. A tubular body 11 provided with a heat insulating layer is attached to a driving roll 1.
8, to protect the heat insulation layer, reinforcing sheet 1
It is necessary to pass it through so that the portion coated with 5 is in contact with the drive roll 18.
以下に本発明の効果を確認するために行った実験例につ
いて説明する。Experimental examples conducted to confirm the effects of the present invention will be described below.
実験例 この実験例は第1図に示す製造装置を用いて行った。Experimental example This experimental example was carried out using the manufacturing apparatus shown in FIG.
外径15.88m5、肉厚0.89■■の長尺の軟質鋼
管を引き出し、その先端部に、ポリオレフィンフィルム
を外表面に貼り合わせた幅144 am。A long soft steel pipe with an outer diameter of 15.88 m5 and a wall thickness of 0.89 mm is pulled out, and a polyolefin film is attached to the outer surface of the tip of the pipe, making it 144 am wide.
厚さ121の無機物充填ポリオレフィン発泡体シートを
巻き付けた。ここで、ポリオレフィンフィルムには、エ
チレン−エチルアクリレート共重合体樹脂にこの樹脂1
00重量部に対して100重量部の水酸化マグネシウム
を配合したものを使用した。また、無機物充填ポリオレ
フィン発泡体シートには、エチレン−酢酸ビニル共重合
体樹脂にこの樹脂100重量部に対して150重量部の
水酸化アルミニウムを配合した発泡倍率が30倍のもの
を使用した。A 121 mm thick mineral-filled polyolefin foam sheet was wrapped. Here, for the polyolefin film, this resin is added to the ethylene-ethyl acrylate copolymer resin.
00 parts by weight and 100 parts by weight of magnesium hydroxide were used. In addition, the inorganic-filled polyolefin foam sheet used had an ethylene-vinyl acetate copolymer resin mixed with 150 parts by weight of aluminum hydroxide per 100 parts by weight of the resin and had a foaming ratio of 30 times.
次いで、フィルムを巻き付けた鋼管を金属製の案内ガイ
ドおよび弗素樹脂製のフォーミング治具に通し、さらに
加熱装置および円筒ダイを通して表面をゴムで被覆した
駆動ロールまで導いた。その後、補強テープとして幅1
20−−1厚さ50μmのアルミニウムテープを案内ガ
イドに通してフォ−ミング治具まで導き、加熱装置手前
で無機物充填ポリオレフィン発泡体シートに仮止めした
。Next, the steel tube wrapped with the film was passed through a metal guide and a fluororesin forming jig, and further led through a heating device and a cylindrical die to a drive roll whose surface was coated with rubber. After that, use it as a reinforcing tape with a width of 1
20--1 An aluminum tape having a thickness of 50 μm was guided through a guide to a forming jig and temporarily fixed to an inorganic-filled polyolefin foam sheet before the heating device.
次に、アルミニウムテープが駆動ロールを通過するまで
駆動ロールを作動させ、無機物充填ポリオレフィン発泡
体シートからアルミニウムテープを外した。鋼管、無機
物充填ポリオレフィン発泡体シート、およびアルミニウ
ムテープをそれぞれ個別に巻き取れる状態にして、再び
駆動ロールを作動させた。このときに熱風式の加熱装置
も稼働させて、加熱融着および円筒ダイ成形を行って連
続的に難燃性断熱管の製造を行った。Next, the drive roll was operated until the aluminum tape passed through the drive roll, and the aluminum tape was removed from the mineral-filled polyolefin foam sheet. The steel pipe, the mineral-filled polyolefin foam sheet, and the aluminum tape were each individually wound, and the drive roll was operated again. At this time, a hot air type heating device was also operated to carry out heat fusion and cylindrical die forming to continuously manufacture flame retardant heat insulating tubes.
巻き取られた難燃性断熱管の表面状態および難燃性断熱
管切断後の断熱層の収縮の有無を調べたところ、断熱層
の加熱融着面に垂直な方向に発生するシワは確認されず
、しかも切断後に断熱層の収縮は認められなかった。When we examined the surface condition of the rolled-up flame-retardant heat-insulated pipe and the presence or absence of shrinkage of the heat-insulating layer after cutting the flame-retardant heat-insulated pipe, no wrinkles were observed that occurred in the direction perpendicular to the heat-fused surface of the heat-sealed layer. Furthermore, no shrinkage of the heat insulating layer was observed after cutting.
[発明の効果コ
以上説明した如く本発明の難燃性断熱管の製造方法は、
優れた難燃性を発揮する断熱管を簡単に、しかも効率よ
く製造することができる。[Effects of the Invention] As explained above, the method for manufacturing a flame-retardant heat-insulating pipe of the present invention is as follows:
It is possible to easily and efficiently manufacture an insulated pipe that exhibits excellent flame retardancy.
第1図は本発明にかかる方法に使用される製造装置の概
略説明図、第2図は従来の断熱管の製造工程を示す工程
図、第3図は従来の方法により得られた断熱管の概略説
明図である。
10・・・管状体コイル、11・・・管状体、12・・
・無機物充填ポリオレフィン発泡体シート用コイル、1
3・・・無機物充填ポリオレフィン発泡体シート、14
・・・補強シート用コイル、15・・・補強シート、1
6・・・案内ガイド、17・・・ユニット、18・・・
駆動ロール、19・・・難燃性断熱管、20・・・断熱
管巻取コイル、31・・・管状体送り出し工程、32・
・・縦添え工程、33・・・管状フォーミング工程、3
4・・・加熱融着工程、35・・・円筒ダイ成形工程、
36・・・巻取工程、40・・・断熱管、41・・・断
熱層、42・・・加熱融着部、43・・・シワ、44・
・・管状体。
出願人代理人 弁理士 鈴江武彦Fig. 1 is a schematic explanatory diagram of the manufacturing equipment used in the method according to the present invention, Fig. 2 is a process diagram showing the conventional manufacturing process of an insulated pipe, and Fig. 3 is a diagram of the insulated pipe obtained by the conventional method. It is a schematic explanatory diagram. 10... Tubular body coil, 11... Tubular body, 12...
・Coil for inorganic-filled polyolefin foam sheet, 1
3...Inorganic-filled polyolefin foam sheet, 14
... Reinforcement sheet coil, 15 ... Reinforcement sheet, 1
6...Information guide, 17...Unit, 18...
Drive roll, 19... Flame retardant insulated pipe, 20... Insulated pipe winding coil, 31... Tubular body sending step, 32.
... Vertical attachment process, 33... Tubular forming process, 3
4... Heat fusion process, 35... Cylindrical die forming process,
36... Winding process, 40... Heat insulating tube, 41... Heat insulating layer, 42... Heat fusion part, 43... Wrinkle, 44...
...Tubular body. Applicant's agent Patent attorney Takehiko Suzue
Claims (1)
置する工程と、該難燃性ポリオレフィン発泡体シートの
外側に補強シートを縦添え配置する工程と、該管状体を
包被するように該2つのシートを成型して略円筒状の難
燃性断熱層を形成する工程と、該難燃性断熱層の長手方
向に沿った当接部を加熱融着する工程と、加熱融着後の
該難燃性断熱層の形状を安定化する工程と、該補強シー
トを分離回収する工程とを具備することを特徴とする難
燃性断熱管の製造方法。a step of arranging a flame-retardant polyolefin foam sheet vertically on the tubular body; a step of arranging a reinforcing sheet vertically on the outside of the flame-retardant polyolefin foam sheet; a step of forming a substantially cylindrical flame-retardant heat insulating layer by molding two sheets, a step of heat-sealing the abutting portions along the longitudinal direction of the flame-retardant heat-sealing layer, and a step of heat-sealing the abutting portions of the flame-retardant heat-sealing layer along the longitudinal direction; A method for producing a flame-retardant heat-insulating pipe, comprising the steps of stabilizing the shape of a flame-retardant heat-insulating layer and separating and collecting the reinforcing sheet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP34059590A JPH04208441A (en) | 1990-11-30 | 1990-11-30 | Manufacture of fire resisting heat insulating pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP34059590A JPH04208441A (en) | 1990-11-30 | 1990-11-30 | Manufacture of fire resisting heat insulating pipe |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04208441A true JPH04208441A (en) | 1992-07-30 |
Family
ID=18338492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP34059590A Pending JPH04208441A (en) | 1990-11-30 | 1990-11-30 | Manufacture of fire resisting heat insulating pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04208441A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100724973B1 (en) * | 2000-12-22 | 2007-06-04 | 프란츠 하스 바펠마시넨-인두스트리 악티엔게젤샤프트 | Feeding device for baking ovens for producing baked shaped units |
KR100843809B1 (en) * | 2000-12-22 | 2008-07-04 | 프란츠 하스 바펠마시넨-인두스트리 악티엔게젤샤프트 | Baking oven for producing baked shaped bodies |
-
1990
- 1990-11-30 JP JP34059590A patent/JPH04208441A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100724973B1 (en) * | 2000-12-22 | 2007-06-04 | 프란츠 하스 바펠마시넨-인두스트리 악티엔게젤샤프트 | Feeding device for baking ovens for producing baked shaped units |
KR100843809B1 (en) * | 2000-12-22 | 2008-07-04 | 프란츠 하스 바펠마시넨-인두스트리 악티엔게젤샤프트 | Baking oven for producing baked shaped bodies |
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