1234628 九、發明說明： I：發明戶斤屬之技術領域3 發明領域 本發明係有關於一種管包覆物本體係由玻璃纖維所構 5 成之隔熱用管包覆物，詳而言之，係有關於一種不論周圍 環境為何，皆可作為所有管路的保溫材使用之隔熱用管包 覆物。1234628 IX. Description of the invention: I: Technical field of the inventors 3 Field of the invention The present invention relates to a pipe covering. The system is made of glass fiber. It relates to a kind of pipe covering for heat insulation, which can be used as the insulation material of all pipes regardless of the surrounding environment.
L· U 發明背景 10 本發明人，已將利用玻璃纖維之隔熱用管包覆物的製 造方法揭示於大韓民國專利公開公報第274314號。 本發明係於業已針軋之玻璃纖維氈塗佈黏合劑，並捲 取至成型滾輪後，利用加壓滾輪加壓並高速旋轉，以獲得 高密度且無切開部之完整型態的管包覆物。雖然將其使用 15 於管路隔熱為劃時代製品而獲得很高的評價，但由於將對 人體有害之玻璃纖維暴露於外部，導致操作性變差，並會 對使用者的健康造成不良的影響，且有商品性劣化之缺點。 又，在施工過程中，由於必須在其外周面另外包覆外 部包裝物，因而需要追加施工成本，且其本身無法作為外 20 部包裝材使用。此外，由於無切開部，故會產生無法適用 於業已施工完成之管線中的缺點。 當然，追加進行切割程序使前述管件分成兩份便可設 置於業已施工的管線中，但如此地分成兩份，反而在搬運 及操作上更為困難，不僅在施工時更耗費勞力與時間，而 1234628 且必須以膠帶或鐵絲等一個一個捆住，故更為麻煩。 又，在暴露於下雪及下雨等易發生漏水的情況下，由 於玻璃纖維具有高吸水性而會散失隔熱性，且會有因水分 吸收造成負載增加，而使構造物的安全性受到嚴重的影響 5 之虞，且會有因業已吸收之水分而造成管件易腐蝕、管線 壽命縮短的問題。 因此，由於利用習知方法所製成的隔熱用管包覆物僅 限使用於無水分滲透之虞之室内管路内建用保溫材，故煉 油公司及一般產業工廠現場的管線工程等最大需要處幾乎 10 不採用前述習知隔熱用管包覆物，對生產者而言，無法期 待高收益。又，對使用者而言，亦無選擇的餘地，且作為 管線保溫材上，其施工性·隔熱性•體積•重量•強度· 施工費用等所有方面，由於只能使用不利之既存的塊狀化 珍珠岩（Perlite)及矽（Silica)，在經濟方面及保養方面有很大 15 的困難，故亟需開發其代替品。 【發明内容】 發明概要 本發明之目的係提供一種商品性高、操作性及施工性 優異，並可適用於完成施工之管線中，且，不論在任何惡 20 劣的條件下，也可維持保溫材機能之隔熱用管包覆物。 為了達成上述目的，本發明係在前述管包覆物本體成 型作業時所利用的黏合劑中，混合適當量的塗佈劑以賦予 拒水性，並將業已成型之包覆物本體進行中心切割分成兩 份後，在其外周面接著形成銘箔而構成者。 1234628 如上所述，由於本發明以鋁箔包裹其外周面，除了可 提高商品性之外，亦可具有優異的操作性及施工性。 又，將前述業已分成兩份的管包覆物本體，左右展開 並嵌套於管件後，僅接著接著部即可輕易地完成施工，由 5 於施工容易，故亦可適用於業已施工之管線中。 完成施工後，即使因凝結現象及漏水等而產生水分， 也會因為在玻璃纖維熟所塗佈之塗佈劑而產生優異的拒水 性，而可直接排水，故沒有所謂因喪失隔熱性及負載而造 成構造物安全性降低的問題。 10 此外，由於前述玻璃纖維並非完全暴露於外部，因而 其本體也可充分地作為外部包裝材使用，且，由於具有優 異的拒水性及鋁箔的排水性，因而作為煉油公司及一般工 廠現場的隔熱用管線使用，並可隨著需求量增加而期待收 益增加，並可取代既存之珍珠岩及矽保溫材，且可滿足設 15 備成本及保養等任一方面。 【實施方式3 實施發明之最佳型態 第1圖係本發明一實施例之隔熱用管包覆物的立體 圖；第2圖係第1圖的側視截面圖；第3圖係顯示本發明隔熱 20 用管包覆物進行施工之狀態之側視截面圖；第4圖係顯示將 本發明管包覆物本體進行成型之狀態之側視截面圖。如第1 圖至第4圖所示，本發明一實施例之隔熱用管包覆物A，係 將混合適當量之塗佈劑之黏合劑滲透至長玻璃纖維氈2，並 將前述玻璃纖維氈2捲取至成型滾輪後，以加壓滾輪6進行 1234628 加壓並使之高速旋轉，在加壓成型後，乾燥、脫膜以獲得 管包覆物本體8，再將所得到之管包覆物本體8，進行中心 切割分成兩份，並在業已分成兩份之管包覆物本體8外周 面，接著鋁箔10而構成者。 5 此外，前述玻璃纖維氈2最好是使長玻璃纖維具有適當 厚度與寬度進行長向成型後，再以針軋進行高密度化來使 用。 又，前述黏合劑係在矽酸黏合劑中適當混合氟系（SWR 430)塗佈劑、強化劑及水而成者，又，經反覆試驗結果得 10 知，最理想的狀態是以石夕酸黏合劑10〜30%、塗佈劑1〜10%、 強化劑1〜10%、及水50〜80%的體積比混合使用。 此時，前述塗佈劑，若將整體量混合成小於基準1%， 則幾乎無法得到預期的拒水性，若混合成大於10%，則會 因為氟含量增加而進行化學反應，反而使拒水性降低，且 15 因氟系塗佈劑價格昂貴，使用量愈多成本愈高，故以在可 發揮作用的投料比例範圍内決定投入量為佳。 此外，在強化劑方面，雖然可使用熱可塑性樹脂，但 由於前述熱可塑性樹脂，投入1%以下無法得到預定強度， 雖投入10%以上雖然強度會增大，但在作為高溫保溫材料 20 使用時，會有因高溫而燃燒之虞，因而亦以在可發揮作用 的投入比例範圍内決定投入量為佳。但前述強化劑與塗佈 劑不同，亦可不添加。 前述玻璃纖維氈的滲透，可先預先將前述玻璃纖維氈 捲至成型滾輪，可使用噴霧器喷射黏合劑，或以使前述玻 1234628 璃纖維|€通過用以供給黏合劑之浸水槽等輕易地進行。但 是，滲透至前述玻璃纖維的黏合劑，考量利用在高速旋轉 之加壓成型時的脫水量，必須吸收高於接著所要求的量， 這也可利用調節前述玻璃纖維氈的供給速度輕易地達成。 5 前述成型滾輪4只要依所需管包覆物本體8的内徑與長 度選擇性地使用即可，且在該滾輪4方面，最好是在捲取玻 璃纖維氈2之前先塗佈離型劑或安裝夾頭等以易於離型。 對於捲取至前述成型滾輪4之玻璃纖維氈2的捲取量， 係以玻璃纖維氈中每m2的密度為基準，由於使用編碼器可 10 每次都供給固定長度，故可規格化，又，該業已捲取之端 部係以刷毛整理自然地精加工為佳。 如此地捲取玻璃纖維氈2後，再使加壓滾輪6以適當的 加壓壓力接觸，同時使成型滚輪4高速旋轉，以進行加壓成 型，此時，會使多餘的黏合劑脫水，並以加壓所產生的強 15 接著力來維持形狀。 在加壓成型後，於進行成型脫膜之前先乾燥。在此情 形下，可使用自然乾燥，但為了更迅速、均一的乾燥，以 使用乾燥器進行真空乾燥為佳。乾燥後，再使玻璃纖維氈2 從成型滾輪4脫膜，即獲得未加工之管包覆物本體。 20 將所獲得之未加工管包覆物本體進行表面加工，並利 用中心切割及側邊切割，可得到具有所需長度且分成兩份 之管包覆物本體8，但，此時，最好是可在側邊切割前進行 中心切割，而兩切斷部之其中一者係未完全切斷並預先保 留一定部分，以防止在側邊切割前失去一體感。 1234628 如此一來，由於在進行中心切割時，將兩切斷部的其 中之一，保留一定之部分以維持一體感，故可輕易地進行 側邊切割及接著鋁箔10。 之後，宜在先進行側邊切割之前接著鋁箔10。即，首 5 先在管包覆物本體8的外周面塗佈黏合劑後，再以兩切斷部 的其中之一的中心切割面為起點，可僅藉包裹前述鋁箔10 而輕易地接著。 此時，將鋁箔10的寬度作成較管包覆物本體更長，以 在進行側邊切割時具有光滑的切斷面。即，可藉由將其延 10 長寬度形成約30〜70mm作為接著部12，可更輕易地施工， 並進而將前述中心切割面的熱損失控制到最小。 又，由於鋁箔10其本身拉伸力差，為了強化其拉伸力， 最好以接著劑貼附玻璃纖維布來使用。 接著，使前述鋁箔10所使用之黏和劑充分乾燥，進行 15 側邊切割。側邊切割可隨著預先設置之隔熱用管包覆物A 的尺寸輕易地分成兩份。 第5圖及第6圖分別為本發明另外實施例之隔熱用管包 覆物A’的立體圖及側視截面圖。本實施例係具有，在切割 前述管包覆物時，儘可能地將側邊切割面14形成稜角或彎 20 曲，且前述側邊切割面分別形成結合突部16與結合溝18， 以在施工時可使結合突部16與結合溝18為相互咬合之構 造。除此之外，其他構造由於與上述實施例相同，故省略 其詳細說明。 如此之中心切割面係形成稜角，並在前述側邊切割面 10 1234628 的兩側端點上，分別形成前述接合突部與結合溝，雖然從 玻璃纖維加工與目前切割技術水準而言，有不易進行切割 作業的缺點，但有可將在切割面的熱損失抑制到最小，並 具有在施工時，隔熱用管包覆物A’、A’彼此之間可更確實 5 地咬合之優點。 本發明由於利用切割分成兩份之管包覆物本體8包圍 其外周面之鋁箔10來維持連結狀態，故可保持優異之操作 性及施工性。 在施工過程中，由於可將其中一側之中心切割部左右 10 充分地展開，並嵌入管件B的外周面後，將鋁箔10的接著部 12重疊並以雙面膠帶接著以完成施工，故可輕易地設置於 業已完成施工之管線中，並且，由於在管包覆物本體8的外 周面包裹鋁箔10，不會使玻璃纖維外露，對於作為外部包 裝材亦具有充分的利用價值。 15 另一方面，用以構成管包覆物本體8之玻璃纖維，由於 在製造過程中塗佈塗佈劑而具有優異之拒水性，故在施工 後，即使在管件B中發生凝結現象及漏水，也可快速排拒水 分。 此外，一旦玻璃纖維具有拒水性，就不會喪失作為隔 20 熱材機能，並且在發生漏水時可更快速地檢出有無漏水及 發生漏水的位置。 又，發生漏水時，可維持連結狀態之前述各個隔熱用 管包覆物本體，係可藉由包裹著外周面之鋁箔10而具有更 完善之防水性，另一方面，由於水會從前述各個隔熱用管 11 1234628 包覆物間的空隙排出，故除了可順利地排出水分之外，也 可即時檢出發生漏水的位置。 另一方面，將本發明的管包覆物作為業已於外部施工 之管線保溫材使用時，即使暴露於雨天及雪地等，都可利 5 用鋁箔10大致完全地遮蔽下雨及下雪等，且，幾乎不會發 生通過前述管包覆物間的空隙之水分滲透情形，又，即使 水分滲透，也可利用前述管包覆物本體的拒水性迅速地排 拒水份，故可維持作為隔熱材之機能。 此外，本發明由於材質非常輕，即使在發生漏水時也 10 可迅速地排水，所以不會對構造物施加過度負荷，故可保 障安全性，並且可顯著地降低因水分所造成的管件腐蝕， 可使管線壽命增長。 【圖式簡單說明】 第1圖係顯示本發明一實施例之隔熱用管包覆物的立 15體圖。 第2圖係第1圖的側視截面圖。 第3圖係顯示本發明隔熱用管包覆物進行施工之狀態 之側視截面圖。 第4圖係顯示將本發明管包覆物本體進行成型之狀態 20 之側視截面圖。 第5圖係顯示本發明其他實施例之隔熱用管包覆物之 立體圖。 第6圖為第5圖的側視截面圖。 12 1234628 【圖式之主要元件代表符號表】 A、 A’...隔熱用管包覆物 B. ..管件 2.. .玻璃纖維氈 4.. .成型滚輪 6.. .加壓滾輪 8.. .管包覆物本體 10.. .鋁箔 12.. .接著部 14…中心切割面 16…結合突部 18.. .結合溝 13L · U Background of the Invention 10 The present inventor has disclosed a method for manufacturing a pipe covering for heat insulation using glass fiber in Korean Patent Publication No. 274314. The invention relates to a glass fiber felt coated with an adhesive, which has been needle-rolled, and is rolled up to a forming roller, and then pressurized with a pressure roller and rotated at a high speed to obtain a high-density and complete type of tube coating without a cut-out Thing. Although it is highly regarded as an epoch-making product when it is used for pipeline insulation, it exposes glass fiber, which is harmful to the human body, to the outside, which results in poor operability and adversely affects the user's health. , And has the disadvantage of commercial deterioration. In addition, during the construction process, the outer peripheral surface must be separately covered with external packaging materials, so additional construction costs are needed, and it cannot be used as the outer 20 packaging materials. In addition, since there is no cut portion, there are disadvantages that cannot be applied to pipelines that have already been constructed. Of course, additional cutting procedures can be used to divide the aforementioned pipe into two parts, which can be installed in the pipeline that has already been constructed. However, such splitting into two parts is more difficult to handle and operate. It not only consumes labor and time during construction, but 1234628 and must be tied one by one with tape or wire, so it is more troublesome. In addition, when exposed to snow or rain, water leakage is likely to occur, because glass fibers have high water absorption, heat insulation properties will be lost, and the load will increase due to moisture absorption, which will affect the safety of the structure. It may seriously affect 5 and may cause problems such as easy corrosion of pipes and shortened pipeline life due to the absorbed moisture. Therefore, since the pipe covering for heat insulation produced by the conventional method is only used for indoor pipe interior insulation materials without the risk of moisture penetration, the largest pipeline engineering on the site of oil refining companies and general industrial plants, etc. Where necessary, almost no conventional tube covering for heat insulation is used, and it is impossible for a producer to expect high yields. In addition, for the user, there is no choice, and as a pipeline insulation material, its construction, heat insulation, volume, weight, strength, construction cost and other aspects can only be used in the existing unfavorable blocks Perlite and Silica have great economic and maintenance difficulties, so they need to be developed as substitutes. [Summary of the Invention] SUMMARY OF THE INVENTION The object of the present invention is to provide a pipeline with high commerciality, excellent operability and workability, and can be applied to pipelines for completion of construction, and can maintain heat preservation under any bad conditions. Tube cover for thermal insulation. In order to achieve the above object, the present invention mixes an appropriate amount of a coating agent in the adhesive used in the above-mentioned tube covering body forming operation to impart water repellency, and performs center cutting of the molded covering body. After two copies, a foil is formed on the outer peripheral surface to form the foil. 1234628 As described above, since the outer peripheral surface of the present invention is wrapped with aluminum foil, in addition to improving commercial properties, it can also have excellent operability and workability. In addition, the pipe covering body that has been divided into two parts is unfolded left and right and nested in the pipe, and then the construction can be easily completed only by the adhering part. Since the construction is easy, it can also be applied to the pipeline that has already been constructed. in. After the construction is completed, even if moisture is generated due to condensation and water leakage, it will be directly drained because of the excellent water repellency due to the coating agent coated on the glass fiber, so there is no so-called loss of heat insulation and The load reduces the safety of the structure. 10 In addition, because the aforementioned glass fiber is not completely exposed to the outside, its body can also be fully used as an outer packaging material, and because of its excellent water repellency and drainage of aluminum foil, it is used as a barrier between oil refineries and general plant sites. The use of hot pipelines can be expected to increase revenue as demand increases, and can replace the existing perlite and silicon insulation materials, and can meet any aspect of equipment cost and maintenance. [Embodiment 3 The best form of implementing the invention. FIG. 1 is a perspective view of a pipe covering for heat insulation according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view of FIG. 1. FIG. The heat insulation 20 of the present invention is a side cross-sectional view showing a state in which a pipe covering is used for construction; FIG. 4 is a side cross-sectional view showing a state in which the pipe covering body of the present invention is formed. As shown in Figs. 1 to 4, the tube covering A for heat insulation according to an embodiment of the present invention is a long glass fiber mat 2 infiltrated with an adhesive mixed with an appropriate amount of a coating agent, and the glass After the fiber mat 2 is taken up to the forming roller, it is pressurized and rotated at 1234628 by the pressure roller 6. After the pressure forming, it is dried and peeled off to obtain the tube covering body 8. The obtained tube is then The cover body 8 is divided into two parts by center cutting, and the outer peripheral surface of the tube cover body 8 which has been divided into two parts is followed by an aluminum foil 10. 5 In addition, the aforementioned glass fiber mat 2 is preferably formed by forming long glass fibers with an appropriate thickness and width in a longitudinal direction, and then using needle rolling to increase the density. In addition, the above-mentioned adhesive is obtained by appropriately mixing a fluorine-based (SWR 430) coating agent, a reinforcing agent, and water in a silicic acid adhesive. The results of repeated tests show that 10 is the most ideal state. 10 to 30% of an acid binder, 1 to 10% of a coating agent, 1 to 10% of a reinforcing agent, and 50 to 80% by volume of water are mixed and used. At this time, if the entire amount of the coating agent is mixed to less than 1% of the standard, the expected water repellency is hardly obtained, and if it is mixed to more than 10%, a chemical reaction will occur due to an increase in the fluorine content, but the water repellency will be made. Decrease, and 15 Because the fluorine-based coating agent is expensive, the more it is used, the higher the cost. Therefore, it is better to determine the input amount within the range of the input ratio that can function. In addition, in terms of reinforcing agents, although thermoplastic resins can be used, due to the aforementioned thermoplastic resins, a predetermined strength of 1% or less cannot be obtained. Although the strength of 10% or more may increase, it is used as a high-temperature insulation material 20 There is a risk of burning due to high temperature, so it is better to determine the amount of input within the range of input ratios that can play a role. However, the aforementioned strengthening agent is different from the coating agent and may not be added. The penetration of the glass fiber mat can be performed by rolling the glass fiber mat onto a forming roller in advance, spraying the adhesive with a sprayer, or making the glass 1234628 glass fiber easily through a water bath for supplying the adhesive. . However, the adhesive that penetrates into the aforementioned glass fiber must be absorbed more than the next required amount in consideration of the amount of dehydration during press molding at high speed. This can also be easily achieved by adjusting the supply rate of the aforementioned glass fiber mat. . 5 The forming roller 4 can be used selectively according to the inner diameter and length of the tube covering body 8 as required, and it is preferable that the roller 4 be coated and released before winding the fiberglass mat 2 Agent or mounting chuck for easy release. The take-up amount of the glass fiber felt 2 taken up to the aforementioned forming roller 4 is based on the density per m2 of the glass fiber felt. Since the encoder can be used to supply a fixed length of 10 each time, it can be standardized. The ends that have been coiled up are naturally finished by brushing. After the glass fiber felt 2 is wound in this way, the pressure roller 6 is brought into contact with an appropriate pressure, and the molding roller 4 is rotated at a high speed to perform pressure molding. At this time, the excess adhesive is dehydrated, and The shape is maintained by a strong 15 force followed by pressure. After pressure molding, it is dried before the mold release. In this case, natural drying can be used, but for quicker and more uniform drying, vacuum drying with a dryer is preferred. After drying, the glass fiber felt 2 is removed from the forming roller 4 to obtain a raw tube covering body. 20 Surface treatment of the obtained raw tube covering body, and use the center cutting and side cutting to obtain a tube covering body 8 having the required length and divided into two, but at this time, it is best The center cutting can be performed before the side cutting, and one of the two cutting parts is not completely cut and a certain portion is reserved in advance to prevent losing the sense of unity before the side cutting. 1234628 In this way, since one of the two cutting portions is retained to maintain a sense of unity during center cutting, the side cutting and the aluminum foil 10 can be easily performed. After that, the aluminum foil 10 should be followed by the side cutting. That is, the first 5 is coated with an adhesive on the outer peripheral surface of the tube covering body 8 first, and then the center cutting surface of one of the two cut portions is used as a starting point, and it can be easily adhered only by wrapping the aluminum foil 10 described above. At this time, the width of the aluminum foil 10 is made longer than that of the tube covering body so as to have a smooth cut surface during side cutting. In other words, by forming the bonding portion 12 by extending it by about 10 to 30 mm in width, the construction can be performed more easily, and the heat loss of the center cutting surface can be minimized. In addition, since the aluminum foil 10 itself has a poor tensile force, in order to strengthen the tensile force, it is preferable to use a glass fiber cloth as an adhesive. Next, the adhesive used for the aluminum foil 10 is sufficiently dried, and 15-side cutting is performed. The side cut can be easily divided into two according to the size of the heat-insulating tube covering A in advance. 5 and 6 are a perspective view and a side cross-sectional view of a heat-insulating pipe covering A 'according to another embodiment of the present invention, respectively. In this embodiment, when cutting the tube covering, the side cutting surface 14 is formed into corners or bends as much as possible, and the side cutting surfaces respectively form a coupling protrusion 16 and a coupling groove 18 so that During the construction, the coupling protrusion 16 and the coupling groove 18 can be configured to engage with each other. Except for this, the other structures are the same as those of the above-mentioned embodiment, so detailed descriptions thereof are omitted. In this way, the central cutting surface forms corners, and the above-mentioned joining protrusions and joining grooves are respectively formed on the two end points of the above-mentioned side cutting surface 10 1234628. Disadvantages of cutting work are that it has the advantage of minimizing the heat loss on the cutting surface, and has the advantage of more securely engaging the pipe wraps A 'and A' for heat insulation during construction. In the present invention, since the aluminum foil 10 surrounding the outer peripheral surface of the tube covering body 8 cut into two parts is used to maintain the connected state, excellent operability and workability can be maintained. During the construction process, the left and right central cutting portions 10 on one side can be fully unfolded and embedded in the outer peripheral surface of the pipe B. Then, the bonding portion 12 of the aluminum foil 10 can be overlapped and bonded with double-sided tape to complete the construction. It can be easily installed in the completed pipeline, and the aluminum foil 10 is wrapped on the outer surface of the pipe covering body 8 so that the glass fiber will not be exposed, and it will also have sufficient use value as an external packaging material. 15 On the other hand, the glass fiber used to form the pipe covering body 8 has excellent water repellency due to the coating agent applied in the manufacturing process. Therefore, even after the construction, condensation and water leakage occur in the pipe fitting B. , Can also quickly drain water. In addition, once the glass fiber has water repellency, it will not lose its function as a heat insulator, and it can detect the leakage and the location of the leakage more quickly when a leak occurs. In addition, when a water leak occurs, each of the aforementioned heat-insulating tube covering bodies that can maintain a connected state can have a more complete waterproof property by wrapping the aluminum foil 10 on the outer peripheral surface. Since each of the insulation pipes 11 1234628 evacuates the gap between the coverings, in addition to the smooth drainage of water, the location where water leakage has occurred can be detected immediately. On the other hand, when the pipe covering of the present invention is used as a pipe insulation material that has been used for external construction, even if it is exposed to rain or snow, it can be used to completely shield rain and snow with aluminum foil 10. Moreover, almost no moisture permeation occurs through the space between the tube coverings, and even if the water permeates, the water repellency of the tube covering body can be used to quickly drain water, so it can be maintained as Function of heat insulation material. In addition, since the material of the present invention is very light, it can drain water quickly even when water leakage occurs, so it will not apply excessive load on the structure, so it can ensure safety, and it can significantly reduce the corrosion of pipe caused by moisture. Can increase pipeline life. [Brief description of the drawings] FIG. 1 is a vertical view showing a tube covering for heat insulation according to an embodiment of the present invention. Fig. 2 is a side sectional view of Fig. 1. Fig. 3 is a side cross-sectional view showing a state in which a pipe covering for heat insulation according to the present invention is being constructed. Fig. 4 is a side cross-sectional view showing a state 20 in which the pipe covering body of the present invention is molded. Fig. 5 is a perspective view showing a pipe covering for heat insulation according to another embodiment of the present invention. Fig. 6 is a side sectional view of Fig. 5. 12 1234628 [Representative symbols for the main components of the drawing] A, A '... Pipe cover for heat insulation B. .. Pipe fittings 2. Glass fiber felt 4. Pressing roller 6. Pressure Roller 8... Tube cover body 10... Aluminum foil 12... Bonding portion 14... Central cutting surface 16...