JP2019119096A - Method for manufacturing heat insulation tube - Google Patents

Abstract

To provide a method for manufacturing a heat insulation tube capable of suppressing a warp of the heat insulation tube while reducing usage of a skin sheet.SOLUTION: In a method for manufacturing a heat insulation tube 10 according to the present invention, first, a foam sheet 20, a first skin sheet 12, and a second skin sheet 13 are prepared. The first skin sheet 12 is pasted onto one end of the foam sheet 20 in the width direction such as to extend over the one end of the foam sheet 20 in the width direction. A fin portion 15 is formed by the extended portion. And, after the formation of the fin portion 15, the foam sheet 20 is rounded and thermally welded, while the end surfaces on both ends in the width direction are butted together, to be cylindrically formed. Prior to the thermal welding of the foam sheet 20, the second skin sheet 13 is pasted onto a region on the other end side from the center of the foam sheet 20 in the width direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing a heat retaining tube, in which a skin sheet is attached to a foam sheet to form a fin, and both end surfaces of the foam sheet are heat-sealed to form a tubular shape.

  In the method of manufacturing the heat retention tube disclosed in Patent Document 1, the foam sheet and the skin sheet wider than the foam sheet are pasted with one side edge aligned, and then both ends of the foam sheet in the width direction are heat-sealed Form into a cylindrical shape.

JP-A-6-143527 (paragraphs [0023] to [0026], FIG. 5, 6)

  In the heat retention tube of Patent Document 1, there is a problem that the amount of use of the surface sheet is large, and the manufacturing cost becomes high. Then, if the skin sheet is made narrower than the foam sheet and is bonded to only one side of the foam sheet, another problem arises that the heat retention tube is warped.

  This invention is made in view of the said situation, and aims at provision of the manufacturing method of the heat retention tube which can suppress curvature of a heat retention tube, reducing the usage-amount of a skin sheet.

  The invention of claim 1 made to achieve the above object is to prepare a long foam sheet and a skin sheet narrower than the foam sheet, and the skin sheet is one end of the foam sheet in the width direction. The skin sheet is bonded to one end in the width direction of the foam sheet so as to protrude, and forming the fin portion at the protruding portion and forming the fin portion, the foam sheet is rounded and both ends in the width direction Forming a tubular shape by heat-sealing while end faces of the parts are butted, and preparing a skin sheet which is narrower than the foam sheet and which is different from the skin sheet, Forming the heat retaining tube, further including bonding the another skin sheet to a region on the other end side from the center in the width direction of the foam sheet prior to heat fusion of the foam sheet It is a method.

  The invention according to claim 2 is the method for manufacturing the heat retention tube according to claim 1, wherein the other skin sheet is attached to the other end of the foam sheet in the width direction.

  The invention according to claim 3 is the method for manufacturing the heat retention tube according to claim 2, wherein the skin sheet and the another skin sheet are attached to each other at predetermined intervals from both ends in the width direction of the foam sheet.

  The invention of claim 4 is characterized in that, when preparing the another skin sheet, when the fin portion is overlapped from the outside to the heat-sealing portion of the foam sheet formed into a tubular shape, the other fin portion is used. It is a manufacturing method of the heat retention tube of Claim 2 or 3 which prepares the thing of the width | variety which the whole outer skin sheet is covered.

  The invention according to claim 5 is the method for manufacturing the heat retention tube according to any one of claims 1 to 4, wherein the skin sheet and the another skin sheet are bonded to the foam sheet at one time.

  According to the invention of claim 6, when preparing the skin sheet and the other skin sheet, one having an adhesive side is prepared, and the skin sheet is laminated to the foam sheet. A release material is attached to the adhesive surface at one end of the width direction, the non-adhered part of the release material of the skin sheet is attached to the foam sheet, and the fin portion is formed by the attached part of the release material. It is a manufacturing method of the heat retention tube as described in any one of the Claims 1 thru | or 5.

  The invention according to claim 7 is the method for manufacturing the heat retention tube according to any one of claims 1 to 6, which comprises forming a slit in the foam sheet formed into a tubular shape.

  The invention according to claim 8 is a portion which is in the vicinity of the heat-sealed portion of the foam sheet molded into a tubular shape and which is covered by the heat-sealed portion when the fin portion is overlapped from the outside. It is a manufacturing method of the heat retention tube of Claim 7 which forms the said slit.

[Invention of Claim 1]
According to the present invention, it is possible to reduce the amount of use of the surface sheet by covering a part in the circumferential direction of the foam sheet formed into a tubular shape with two surface sheets of the surface sheet and another surface sheet. In addition, the skin sheet and the other skin sheet are bonded to each other at one end and the other end of the foam sheet in the width direction. Therefore, in the foam sheet formed into a cylindrical shape, it is possible to reduce the difference in thermal contraction between the part on one side and the part on the other side across the fusion bonding surface, and to suppress the warpage of the heat retention tube. It becomes possible.

[Invention of Claim 2]
According to the present invention, since both the skin sheet and the other skin sheet are disposed in the vicinity of the fusion bonding surface of the foam sheet, the foam in which the fin portion of the skin sheet is formed into a tubular shape so as to hide the fusion surface. When wound on a sheet, the fin portion can be adhered to another skin sheet, and adhesion of the fin portion can be improved as compared with direct adhesion to a foam sheet.

[Invention of Claim 3]
According to the present invention, the skin sheet and another skin sheet are prevented from interfering with heat fusion, and the skin sheet and the other skin sheet themselves are prevented from being melted by heat.

[Invention of Claim 4]
According to the present invention, when the fin portion is wound around the foam sheet so as to hide the fused surface of the foam sheet, the fin portion can hide another skin sheet to improve the appearance of the heat insulation tube. Become.

[Invention of Claim 5]
According to the present invention, the number of manufacturing steps can be reduced as compared to the case where the skin sheet and another skin sheet are bonded in separate steps.

[Invention of Claim 6]
According to the present invention, the fin portion can be wound around the foam sheet by removing the release material and then bonding the fin portion to another skin sheet.

[Invention of Claim 7]
According to the heat retention tube of the present invention, the pipe can be covered from the outside through the pipe through the slit.

[Invention of Claim 8]
According to the heat insulation tube of the present invention, since the slits can be covered with the fins, the appearance can be improved.

(A) A perspective view of a heat retention tube according to an embodiment of the present invention, (B) a sectional view (A) Cross-sectional view of heat-retention tube with slits formed, (B) Cross-sectional view of heat-retention tube wound around pipe, (C) Cross-sectional view of heat-retention tube with slits closed at fins (A) Side view showing bonding process, (B) Side view showing forming process Perspective view of bonding device (A) plan view for explaining the folding of the first skin sheet, (B) sectional view Top view of forming apparatus (A) A perspective view showing another example of a heat retention tube, (B) a cross sectional view (A) A figure for explaining a measuring method of bending of a heat retention tube, a table showing the result of (B) confirmation experiment The side view which shows the manufacturing process of the heat retention tube which concerns on other embodiment Sectional drawing which shows the manufacturing process of the heat retention tube which concerns on other embodiment

  As shown in FIG. 1 (A) and FIG. 1 (B), the heat retention tube 10 according to the present embodiment includes a tube 11 made of a synthetic resin foam or the like, and a tube on the outer peripheral surface of the tube 11. The first skin sheet 12 and the second skin sheet 13 are provided along the longitudinal direction of the body 11. The first skin sheet 12 and the second skin sheet 13 are formed narrower than the length of the outer periphery of the tube 11. And a part of outer peripheral surface of tube body 11 is covered with the 1st skin sheet 12 and the 2nd skin sheet 13, and the remaining portion is exposed. The tubular body 11 is a foam of a thermoplastic resin such as a polyolefin resin (polyethylene resin, polypropylene resin, etc.), polystyrene resin, polyvinyl chloride resin, polyethylene vinyl acetate copolymer resin, polyurethane resin And the like, and the first skin sheet 12 and the second skin sheet 13 are made of polyvinyl chloride resin, thermoplastic resin such as polyolefin resin, polyolefin thermoplastic elastomer, polystyrene resin, etc. It is composed of thermoplastic elastomers such as thermoplastic elastomers and polyurethane thermoplastic elastomers.

  In the first skin sheet 12, only one side portion in the width direction is bonded to the tube body 11. On the other hand, the whole of the second skin sheet 13 in the width direction is bonded to the tube body 11. And the fin part 15 is formed by the part which is not bonded together by the pipe body 11 among the 1st outer_skin | epidermis sheets 12. As shown in FIG. The fins 15 are folded back.

  Specifically, one side of the first skin sheet 12 and the second skin sheet 13 is formed as an adhesive surface. A release material 14 (e.g., release paper, release film, etc.) is attached to the adhesive surface of the first skin sheet 12 so as to protrude from the first skin sheet 12 on one side in the width direction of the first skin sheet 12 The first skin sheet 12 is bonded to the tubular body 11 at the non-sticking portion of the release material 14. And the sticking part of exfoliation material 14 among the 1st skin sheets 12 forms the above-mentioned fin part 15. As shown in FIG. On the other hand, the second skin sheet 13 is bonded to the tubular body 11 in the entire width direction. The peeling material 14 slightly protrudes from the side edge in the width direction of the first skin sheet 12 in order to facilitate the peeling.

  As will be described in detail later, the tubular body 11 is formed by rounding the foam sheet 20 shown in FIG. 4 into a cylindrical shape and heat-sealing end faces of both end portions of the foam sheet 20 in the width direction. In FIG. 1A and FIG. 1B, the joint surface 20M of the foam sheet 20 is shown by a two-dot chain line.

  As shown in FIG. 1 (B), the first skin sheet 12 is disposed in the vicinity of the bonding surface 20M. Specifically, the first skin sheet 12 is bonded to a portion which is separated from the bonding surface 20M by a predetermined distance (for example, 2 mm) or more in the circumferential direction of the tube 11.

  The second skin sheet 13 is disposed on the opposite side of the first skin sheet 12 with reference to a position shifted by 180 degrees from the bonding surface 20M in the circumferential direction of the pipe body 11. That is, when the pipe body 11 is divided into two by the division plane S1 including the bonding surface 20M and passing through the central axis 11J of the pipe body 11, the first outer sheet 12 is provided in one of the divided bodies and the other divided body Is provided with a second skin sheet 13. In the example of the present embodiment, the second skin sheet 13 is bonded to the other divided body side of the pair of butting portions 21 and 21 which are abutted on both sides of the bonding surface 20M in the circumferential direction of the pipe body 11. The second skin sheet 13 is bonded to a portion which is separated from the bonding surface 20M by a predetermined distance (for example, 2 mm) or more in the circumferential direction of the tubular body 11. In addition, the space | interval of each skin sheet 12 and 13 and the joint surface 20M may be the same, and may differ.

  As shown in FIG. 2 (C), the heat retention tube 10 is used by winding around a pipe 30 through which a fluid flows. In order to wind the heat retention tube 10 around the pipe 30, first, as shown in FIG. 2A, slits 31 are formed at one place in the circumferential direction of the tube 11 to make the tube 11 a C-shaped cross section. Do. The slit 31 is formed in a portion of the tubular body 11 sandwiched between the attached portion of the first surface sheet 12 and the attached portion of the second surface sheet 13, preferably, as in the example of FIG. It is formed along 20M. The heat retention tube 10 may be of a slit type in which the slit 31 is formed in the tubular body 11 in advance.

  When the slit 31 is formed in the pipe body 11, the pipe 30 is passed through the slit 31 of the pipe body 11 as shown in FIG. 2B, and the pipe body 11 covers the outside of the pipe 30. Next, as shown in FIG. 2C, the release material 14 is peeled off from the fin portion 15 of the first skin sheet 12, and the fin portion 15 is wound around the tubular body 11 so as to close the slit 31. Then, the adhesive surface covered with the release material 14 in the fin portion 15 adheres to the tube body 11 and the second skin sheet 13. By the above, the heat retention tube 10 is wound around the pipe 30.

  As described above, in the heat retention tube 10, the first skin sheet 12 and the second skin sheet 13 are bonded to the pair of butting portions 21 and 21 which are abutted on both sides of the bonding surface 20M. When the fin portion 15 is wound around the tubular body 11, the fin portion 15 can be adhered to the second skin sheet 13. Thereby, the adhesion of the fins 15 can be improved as compared with the case where the fins 15 are directly adhered to the foam sheet 20. Moreover, since the slits 31 are covered with the fins 15, the appearance of the heat insulating tube 10 can be improved. In addition, since the first skin sheet 12 and the second skin sheet 13 are collected at one place in the circumferential direction of the heat retention tube 10, it becomes easy to bend the heat retention tube 10 while avoiding the warp of the heat retention tube 10. In addition, the appearance of the heat retention tube 10 can be improved by collecting the first skin sheet 12 and the second skin sheet 13 at one place in the circumferential direction of the heat retention tube 10. In particular, as shown in FIG. 2C, the width of the second skin sheet 13 is such that the entire second skin sheet 13 is covered with the fins 15 wound around the tubular body 11. Also, the second skin sheet 13 does not protrude from the first skin sheet 12, and the appearance of the heat retention tube 10 can be further improved.

  The manufacturing process of the heat retention tube 10 is shown by FIG. 3 (A) and FIG. 3 (B). In FIG. 3 (A), the first outer sheet 12 (e.g., 0.05 to 0.5 mm in thickness, 40 to 60 mm in width) and the foam sheet 20 (e.g., 5 to 20 mm in thickness, 120 to 300 mm in width) 2 A bonding step of bonding together the surface sheet 13 (for example, thickness 0.05 to 0.5 mm, width 10 to 30 mm) is shown, and in FIG. 3 (B), a forming step of forming the foam sheet 20 into a cylindrical shape It is shown.

  As shown in FIG. 3 (A) and FIG. 4, a bonding device 40 is used in the bonding step. The bonding apparatus 40 includes a feed roller 41 for feeding the foam sheet 20 in the longitudinal direction, and a pair of pressure-bonding rollers 42 and 42 for bonding the first skin sheet 12 and the second skin sheet 13 to the foam sheet 20. Is equipped. The pair of pressure-bonding rollers 42, 42 are disposed to sandwich the foam sheet 20 in the thickness direction, and rotate in opposite directions. In the present embodiment, the foam sheet 20 is disposed substantially horizontally, and the first skin sheet 12 and the second skin sheet 13 are bonded to the upper surface of the foam sheet 20.

  As shown in FIG. 4, the first skin sheet 12 is guided by the guide roller 43 to the upstream side of the pressure roller 42 on the upper side, and the adhesive sheet is directed to the foam sheet 20 side in the width direction of the foam sheet 20. It is superimposed on one end. Then, the first skin sheet 12 is crimped to one end of the foam sheet 20 by the pair of crimping rollers 42, 42. Here, the peeling material 14 guided to the upstream side of the pressure roller 42 by the guide roller 44 shown in FIG. The first skin sheet 12 is disposed such that the attached portion of the release material 14 protrudes from one end in the width direction of the foam sheet 20. At this time, the fin portion 15 is formed by the sticking portion of the release material 14.

  Further, as shown in FIG. 4, the second skin sheet 13 is guided by the above-described guide roller 43 to the upstream side of the pressure roller 42 on the upper side, and the foam sheet 20 with the adhesive surface directed to the foam sheet 20 side. On the other end in the width direction of the At this time, the second skin sheet 12 is disposed at a predetermined distance from the other end edge of the foam sheet 20 in the width direction. Then, the second skin sheet 13 is crimped to the other end of the foam sheet 20 by the pair of crimping rollers 42, 42.

  As shown in FIGS. 5 (A) and 5 (B), when the first skin sheet 12 and the second skin sheet 13 are bonded to the foam sheet 20, then the fins 15 of the first skin sheet 12 are formed. , Folded back by the folding guide 45. Here, if the side edge portion of the release material 14 overlaps the one end edge of the foam sheet 20 in the width direction before the first skin sheet 12 is folded back, and the first skin sheet 12 is folded back, The first skin sheet 12 is disposed at a predetermined distance from one end of the foam sheet 20 in the width direction.

  As shown in FIG. 3A, when the first skin sheet 12 is folded back, the fins 15 are pressed by the pressing roller 46 from the upper side. Then, the foam sheet 20 is taken up by the take-up roller 47.

  As shown in FIG. 3 (B), a molding apparatus 50 is used in the molding process. The forming apparatus 50 includes a bending guide 51, a preheating heater 52, a forming die 53, and a fusion heater 54. The bending guide 51 lifts both ends in the width direction of the foam sheet 20 before molding and bends it in a U-shape. The preheating heater 52 blows hot air from above onto the foam sheet 20 before molding. The forming die 53 is a die for forming the foam sheet 20 into a cylindrical shape, and has a forming hole 53A substantially equal to the outer diameter of the heat retention tube 10 penetrating in the feeding direction of the foam sheet 20. The fusion bonding heater 54 is disposed on the upstream side of the forming die 53 such that the tip of the heater is close to the forming hole 53A.

  In the forming step, the foam sheet 20 to which the first skin sheet 12 and the second skin sheet 13 are bonded is sent to the forming die 53 with the skin sheets 12 and 13 facing downward. Before reaching the forming die 53, the foam sheet 20 is formed into a U-shaped groove shape by the bending guide 51, and the inner surface of the groove is heated by the preheating heater 52. The U-shaped grooved foam sheet 20 is pushed into the forming hole 53A of the forming die 53 while being rounded so that the end faces of the both end portions in the width direction are butted by a guide not shown. At this time, the end faces of both ends in the width direction of the foam sheet 20 are heated by the fusion heater 54 and are in a molten state. When the foam sheet 20 passes through the forming hole 53A, the end faces of both ends of the foam sheet 20 in the molten state are thermally fused to form the foam sheet 20 into a tubular shape, and the tube 11 shown in FIG. 1 is completed. . By the above, the heat retention tube 10 is completed. The above-mentioned slit-type heat retention tube 10 is in the vicinity of the heat-fused portion of the foam sheet 20 formed into a tubular shape (in detail, when the fin portion 15 is overlapped from the outside on the heat-fused portion) The slit 31 is further formed in the portion covered by the fin portion 15).

  The heat retention tube 10 V shown in FIG. 7 is manufactured in the same manner as the heat retention tube 10. The heat retention tube 10V is different from the heat retention tube 10 only in the arrangement of the second skin sheet 13, and the other constitution is the same as the heat retention tube 10.

  In the heat retention tube 10V, the second skin sheet 13 is disposed on the opposite side of the first skin sheet 12 with the central axis 11J of the tube 11 interposed therebetween. Therefore, also in the heat retention tube 10V, in the case where the pipe body 11 is divided into two by the division plane S1 including the joint surface 20M and passing through the central axis 11J of the pipe body 11, the first outer sheet 12 is provided in one divided body. And the other divided body is provided with the second skin sheet 13. In addition, in the production of the heat retention tube 10V, the first skin sheet 12 is bonded to one end of the foam sheet 20 in the width direction, and the second skin sheet 13 is on the other end side than the center of the foam sheet 20 in the width direction. In the area | region, it bonds together to the part by the side of the width direction center of the foam sheet 20. As shown in FIG.

  In the method of manufacturing the heat retention tubes 10 and 10 V of the present embodiment, two skin sheets of the first skin sheet 12 and the second skin sheet 13 cover a part of the tubular foam sheet 20 in the circumferential direction. Thus, the amount of use of the skin sheet can be reduced. In addition, the first skin sheet 12 and the second skin sheet 13 are bonded to each other at one end and the other end of the foam sheet 20 in the width direction. Therefore, in the foamed sheet 20 formed into a tubular shape, it is possible to reduce the difference in thermal contraction between the portion on one side and the portion on the other side across the fusion bonding surface, and the warping of the heat retention tubes 10 and 10V It becomes possible to suppress.

  Further, in the present embodiment, since the first skin sheet 12 and the second skin sheet 13 are bonded together at a predetermined interval from both ends in the width direction of the foam sheet 20, the first skin sheet 12 and the second skin sheet 13 Is an obstacle to heat fusion, and the skin sheet and the other skin sheet itself are prevented from being melted by heat.

  Further, in the present embodiment, since the first skin sheet 12 and the second skin sheet 13 are bonded to the foam sheet 20 at one time, the first skin sheet 12 and the second skin sheet 13 are compared in a separate step. Thus, the number of manufacturing steps can be reduced.

  Moreover, according to the heat retention tubes 10 and 10 V of the present embodiment, the type of the size of the skin sheet to be used is significantly reduced as compared to the conventional heat retention tube in which the skin sheet is bonded to the entire outer peripheral surface of the cylindrical body 11. Is possible. That is, when there are a plurality of types of pipes 30 for winding the heat retention tubes 10, 10V having different outer diameters, only the width of the foam sheet 20 is changed, and the heat retention tubes are not changed. 10, 10V can be manufactured. Further, even when there are a plurality of types of thickness of the foam sheet 20, the heat retention tubes 10 and 10V can be manufactured without changing the widths of the skin sheets 12 and 13. In addition, in the conventional heat retention tube, it is necessary to change the width | variety of an outer_skin | epidermis sheet | seat according to the outer diameter of the pipe 30, and the thickness of a foam sheet.

[Confirmation experiment]
The effect of the manufacturing method of the heat retention tubes 10 and 10V which concern on this embodiment was confirmed by confirmation experiment. In this confirmation experiment, as shown in FIG. 8A, with respect to a plurality of heat retaining tubes including the heat retaining tubes 10 and 10 V, the floating amount X when both ends of the heat retaining tube are placed on a horizontal stand is It measured and made the amount X of uplifting into the amount of curvature of a heat retention tube. The measurement was performed twice immediately after production and six hours after production. The measurement result of each heat retention tube is shown by FIG. 8 (B). In the figure, Experimental Example 1 is the heat retention tube 10, and Experimental Example 2 is the heat retention tube 10V. In addition, Experimental Example 3 is a heat retaining tube manufactured by bonding only the first skin sheet 12 to the foam sheet 20. In each experimental example, a sheet of a polyethylene resin foam having a thickness of 7 mm was used as the foam sheet 20, and a polyvinyl chloride resin sheet having a thickness of 0.1 mm was used as the first skin sheet 12 and the second skin sheet 13. .

  As shown in FIG. 8B, the amount of warpage of Experimental Examples 1 and 2 is half or less of that of Experimental Example 3 immediately after production and 6 hours after production. From this, by bonding the second skin sheet 13 to the foam sheet 20, the difference in thermal contraction between the pair of butting portions 21 and 21 in the tubular body 11 after production is reduced, and the heat retention tube 10, It can be seen that warpage is suppressed at 10V.

  The amount of warpage in experimental example 2 is smaller than that in experimental example 1. In Experimental Example 2, the second skin sheet 13 is disposed on the opposite side of the first skin sheet 12 with respect to the center axis 11J of the pipe body 11 (see FIG. 7B). It is considered that the warping of the heat retention tube 10V resulting therefrom is canceled by the warp of the heat retention tube 10V attributed to the second skin sheet 13.

[Other embodiments]
The present invention is not limited to the above-described embodiment, and, for example, the embodiments described below are also included in the technical scope of the present invention, and various other variations are possible without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, the entire second skin sheet 13 is disposed on the other divided body side with respect to the division surface S1 of the pipe body 11, but the second skin sheet 13 is disposed so as to straddle the division surface S1. It may be done. In the case of manufacturing such a heat retention tube 10V, in the bonding step, the second skin sheet 13 may be bonded to the foam sheet 20 so as to cross the central position in the width direction of the foam sheet 20.

  (2) In the above-mentioned embodiment, in manufacturing heat retention tube 10, 10V, as shown in Drawing 9, a pasting process and a forming process may be performed continuously.

  (3) In the embodiment described above, only one second skin sheet 13 is attached, but a plurality of second skin sheets 13 may be attached to the other divided body of the tubular body 11 in the circumferential direction. In this case, the plurality of second skin sheets 13 may include those pasted across the dividing surface S1. When manufacturing such heat retention tubes 10 and 10 V, in the bonding step, the second skin sheet 13 may be bonded to a plurality of positions in the width direction at the other end side portion in the width direction of the foam sheet 20 .

  (4) In the said embodiment, although bonding of the 1st skin sheet 12 and the peeling material 14 was performed when bonding the 1st skin sheet 12 together to the foam sheet 20, it is performed before it. It is also good. In this case, for example, one in which the release material 14 is bonded to the entire adhesive surface of the first skin sheet 12 is prepared, and the release material 14 is prepared upstream of the pair of pressure rollers 42, 42 in the bonding process. By peeling one side portion in the width direction from the first skin sheet 12, the adhesive surface of the other side portion in the width direction of the first skin sheet 12 is exposed, and the first skin sheet 12 is attached to the foam sheet 20 May be

  (5) In the said embodiment, the width | variety of the part by which the 1st skin sheet 12 and the 2nd skin sheet 13 are each bonded together to the foam sheet 20 may be the same, and may differ.

  (6) In the above embodiment, the width of the second skin sheet 13 is sized to be entirely covered by the fins 15, but even if only a part is covered by the fins 15, Good.

  (7) In the above embodiment, the adhesive may be applied only to a part of one side of the first skin sheet 12 in the bonding step. In this case, an adhesive or the like may be applied only to the portion of the first skin sheet 12 to be bonded to the foam sheet 20 in the bonding step without using the release material 14. In this case, when winding the heat retention tubes 10 and 10V around the pipe 30, an adhesive or the like may be applied to the fin portion 15, or may be adhered with a double-sided tape or the like. In addition, the fins 15 may have a width overlapping the second skin sheet 13 when the heat retention tubes 10 and 10 V are wound around the pipe 30, or a width not overlapping the second skin sheet 13. It is also good.

  (8) In the above embodiment, the materials of the first skin sheet 12 and the second skin sheet 13 may be the same or different. Further, the thicknesses of the first skin sheet 12 and the second skin sheet 13 may be the same or different.

  (9) In the above embodiment, the first skin sheet 12 and the second skin sheet 13 are bonded to the foam sheet 20 at one time, but the first skin sheet 12 and the second skin sheet 13 are bonded to the foam sheet 20 The timing may be shifted.

  (10) In the above embodiment, when manufacturing the heat retention tubes 10 and 10V, the fins 15 are folded, but may not be folded. In this case, for example, a receiving portion may be provided on the inner peripheral surface of the forming hole 53A of the forming die 53 so as to extend from one end of the forming hole 53A to the other end and receive the fin portion 15. By receiving the fins 15 in the receiving portion, the foam sheet 20 can be formed into a cylindrical shape without folding back the fins 15. As such a receiving portion, a groove or a slit 53S (see FIG. 10) communicated with the outside of the forming die 53 may be mentioned.

  (11) In the above embodiment, the release material 14 is pasted so as to protrude from the side edge in the width direction of the first skin sheet 12, but so as to protrude from the side edge in the longitudinal direction of the first skin sheet 12 It may be stuck or may be stuck so as not to protrude from the first skin sheet 12. Also in the latter case, if the peeling member 14 is provided with a tab portion that can be pinched by the worker, the peeling can be facilitated.

Reference Signs List 10 heat retention tube 12 first skin sheet 13 second skin sheet 14 peeling material 15 fin portion 20 foam sheet

Claims (8)

Preparing a long foam sheet and a skin sheet narrower than the foam sheet;
Bonding the skin sheet to one end of the foam sheet in the width direction so that the skin sheet protrudes from one end in the width direction of the foam sheet, and forming a fin portion at the protruding portion;
After the formation of the fin portion, the foam sheet is rolled and heat fusion is performed while end faces of both end portions in the width direction are butted to form a tubular shape;
Preparing a skin sheet which is narrower than the foam sheet and which is different from the skin sheet;
Prior to heat sealing of the foam sheet, and further bonding the other skin sheet to a region on the other end side from the center in the width direction of the foam sheet.   The manufacturing method of the heat retention tube of Claim 1 which bonds together the said another skin sheet to the other end part of the width direction of the said foam sheet.   The manufacturing method of the heat retention tube of Claim 2 which pastes together the outer skin sheet and the said another outer skin sheet at predetermined intervals from the both ends of the width direction of the said foam sheet.   In preparing the other skin sheet, when the fin portion is superimposed from the outside on the heat-fusion portion of the foam sheet formed into a tubular shape, the entire skin layer is covered with the fin portion. The manufacturing method of the heat retention tube of Claim 2 or 3 which prepares the thing of width.   The method for manufacturing a heat retaining tube according to any one of claims 1 to 4, wherein the foam sheet and the another foam sheet are bonded to the foam sheet at one time. In preparing the skin sheet and the other skin sheet, prepare one having an adhesive side,
When the skin sheet is bonded to the foam sheet, a release material is bonded to the adhesive surface of the skin sheet near the one end in the width direction, and the non-sticking portion of the release material in the skin sheet is used as the foam sheet. The method for manufacturing a heat retaining tube according to any one of claims 1 to 5, wherein the fins are attached to each other, and the fin portion is formed at an attachment portion of the release material.   The manufacturing method of the heat retention tube as described in any one of the Claims 1 thru | or 6 including forming a slit in the said foamed sheet shape | molded by the cylindrical shape.   The slit is formed in the vicinity of the heat-sealed portion of the foam sheet formed into a tubular shape, and the portion covered with the heat-sealed portion when the fin is overlapped from the outside. The manufacturing method of the heat retention tube of Claim 7.