JP2016098911A - Heat insulation pipe and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation pipe configured by curving a reins foam sheet in a cross sectional circular shape and connecting and fusing both end surfaces thereof in an abutted manner, which has strong connection strength of a connection part.SOLUTION: In a heat insulation material, a resin film 3, in which both end lug parts 3a, 3b are projected from both ends of a belt-like resin foam sheet 2, is laid on a one-side surface of the resin foam sheet 2. In a heat insulation pipe, the heat insulation material is curved into a cross sectional circular shape so that a resin film 3 is externally fitted; the lug parts 3a, 3b of the resin film 3 is melted with heat and interposed between end surfaces 2a, 2b of the resin foam sheet 2 opposite to each other in an abutted manner; and the end surfaces 2a, 2b of the resin foam sheet 2 are connected and fused to each other by the melted lug parts 3a, 3b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat insulating tube formed by bending and molding a thermoplastic resin foam sheet having a resin film layered on one side thereof into a circular cross section so that the resin film becomes an outer cover, and a method for manufacturing the same.

  Conventionally, in order to provide a heat insulating function to a pipe such as a water supply pipe such as a drain hose or a water pipe of an air conditioner or a drain pipe, the pipe is covered with a heat insulating material. As such a heat insulating material, for example, as described in Patent Document 1, a band-shaped resin foam sheet such as a polyethylene cross-linked foam sheet in which a resin film is layered on one side as a reinforcing layer is used. The resin foam sheet is curved in a cross-sectional circle shape in the width direction so that the resin film becomes an outer cover, the opposite end faces are melted by heating, butted together, and the butted joints are fused together to form a heat insulating tube. I am making it.

  In order to obtain a pipe material covered with this heat insulating pipe, the resin film layered on one side of the belt-shaped resin foam sheet is placed on the lower side, and the center in the width direction of the resin foam not provided with this resin film The pipe material is supplied on the part with its length direction oriented in the length direction of the resin foam sheet, the resin foam sheet is bent along the outer peripheral surface of the pipe material so as to wrap the pipe material, and both end faces thereof are heated. After being melted, it is further curved until it has a circular cross section, and the two end faces are butted together, so that the butted joints are fused together to form a heat insulating pipe covering the pipe material. .

  It is also possible to prepare a heat insulating tube whose inner diameter is approximately equal to the outer diameter of the pipe material in advance, and to insert a pipe material such as a regular drain hose into the heat insulating tube to produce a pipe material covered with the heat insulating pipe. Has been done.

  Further, in the heat insulating tube produced by bending the resin foam sheet into a circular cross section and joining and fusing both end faces in abutting manner, the joined and fused parts are covered over the entire length. Thus, it is also described that a narrow band-shaped reinforcing resin film is fused to the outer peripheral surface of the heat insulating tube.

Japanese Patent Laid-Open No. 5-454

  However, the heat insulating tube is made by bending a strip-shaped resin foam sheet into a circular cross section along the width direction, and joining countless cell walls with a very thin wall thickness of the foam resin exposed at both end faces in a butted manner In such a fusion between the bubble walls, the fusion strength is weak, and when internal pressure or the like acts on the heat insulating tube, stress is applied in the direction of pulling away from both ends joined in a butt-like manner. May occur and peel from the joint surface.

  In addition, a resin film is layered on one side of the belt-shaped resin foam sheet, and when the resin foam sheet is curved into a circular cross section as described above, both end faces are joined and fused in a butted manner In addition, both end surfaces of this resin film can be joined and fused in a butted manner, but the resin film is used to prevent scratches and the like from occurring on the surface of the resin foam sheet forming the heat insulating tube. The thickness is extremely thin, and the end faces of such an extremely thin resin film sufficiently reinforce the fusion strength of the joint surface of the resin foam sheet curved in a circular cross section. I can't.

  For this reason, in the invention according to Patent Document 1, a narrow belt-like resin film is fused on the fused portion between the end faces of the resin film. There has been a problem that it is difficult to provide a thickness that can sufficiently counteract stresses acting in the direction of pulling away from each other at both ends of the tube joined in the above-mentioned butt shape.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a heat insulating tube obtained by bending a resin foam sheet into a circular cross section and joining and fusing both end faces thereof in a butted manner. The present invention provides a heat insulating tube having a stronger fusion strength at the joint and a method for manufacturing the same.

  In order to achieve the above object, a heat insulating tube according to the present invention comprises a heat insulating material obtained by laminating a resin film on one side of a strip-shaped resin foam sheet having a certain width, as described in claim 1. Is a heat insulating tube that is curved into a circular cross section in the width direction so that it becomes an outer cover, and that the opposite end faces are butted together and joined together, and the resin film has a constant width protruding from the resin foam sheet Ear portions are provided, and the opposed end surfaces of the butted resin foam sheets curved into a circular cross-section by melting and solidifying the ear portions are integrally joined together.

  In the heat insulating pipe configured as described above, the invention according to claim 2 is provided with ear portions protruding from both ends of the resin foam sheet at both ends of the resin film, and a cross-sectional circle formed by melting and solidifying the both ear portions. The end faces of the resin foam sheets curved into a shape are joined together.

  A heat insulating tube according to a third aspect of the present invention is a heat insulating material obtained by laminating a resin film on one side of a strip-shaped resin foam sheet having a certain width, and a cross-sectional circle in the width direction so that the resin film becomes an outer cover. It is a heat insulating tube that is curved into a shape and is joined integrally by abutting opposing end faces, and both end portions of the resin film are formed into thick end portions, and the thick end portions are circular in cross section. The opposite end faces of the resin foam sheets that are melted in the pipe outer peripheral portion between the opposite end faces of the curved resin foam sheet and are opposed to each other at the thick end portions and the resin foam sheet that is curved in a circular cross section. It is characterized by bonding and fusing each other.

  The invention according to claim 4 is characterized in that a pipe material such as a drain hose or a water supply / drainage pipe is covered with the heat insulation pipe according to any one of claims 1 to 3.

  The invention according to claim 5 is the method for manufacturing the heat insulating tube, wherein the end portion is protruded from the end portion in the width direction of the resin foam sheet over the entire surface of one side of the strip-shaped resin foam sheet having a constant width. In the step of bending the heat insulating material formed by laminating the resin film formed on the width ear part into a circular arc shape along the width direction so that the resin film becomes an outer cover, and in the curved heat insulating material A step of heating and melting the ear portion of the resin film protruding from the end portion of the resin foam sheet and fusing the ear portion to the end surface of the resin foam sheet, and further bending the heat insulating material until a circular cross section is obtained. A process of joining both end faces of the resin foam sheet in a butt-like manner through the melted ears of the resin film, and joining and fusing both end faces of the joined resin foam sheets integrally with the melted ears of the resin film Tokara It is characterized in.

  In the method for manufacturing a heat insulating tube according to claim 5, the invention according to claim 6 is configured such that both end portions protrude from both ends in the width direction of the resin foam sheet over the entire surface of one surface of the strip-shaped resin foam sheet having a certain width. The heat insulating material formed by laminating the resin film formed on the ears of a certain width is curved in a cross-section arc shape, and both end ears of the resin film are heated and melted to both end surfaces of the resin foam sheet, respectively. After being fused, the heat insulating material is further curved until it has a circular cross section, and both end faces of the resin foam sheet are joined and fused by the both ends of the melted resin film.

  The method for manufacturing a heat insulating tube according to claim 7 is a heat insulating material obtained by laminating a resin film in which both end portions are formed as thick end portions on the entire surface of one side of a strip-shaped resin foam sheet having a certain width. Of the resin film is curved in a cross-sectional arc shape along the width direction, the step of heating and melting the thick end of the resin film, and the heat insulating material is further circular in cross section Bending both ends of the resin foam sheet in a butted shape and pushing the thick end of the resin film melted into the outer peripheral surface of the joint of the resin foam sheet curved into a circular cross section And a step of joining and fusing the thick end portions in a butted manner.

  The invention according to claim 8 is a method for manufacturing a heat insulating pipe covered with a pipe material such as a drain hose or a water supply / drain pipe, and an end portion of the resin foam sheet is formed on the entire surface of one surface of a strip-shaped resin foam sheet having a certain width. A heat insulating material formed by laminating a resin film formed on the edge portion of a certain width protruding from the end in the width direction is arranged so that the resin film becomes the lower surface, and the pipe material is supplied onto the resin foam sheet. A step of arranging, a step of bending the heat insulating material along the outer peripheral surface of the pipe so as to wrap the pipe, and a step of heating and melting the ear portion of the resin film to be fused to the end face of the resin foam sheet. In addition, the heat insulating material is further bent to have a circular cross section so as to wrap the tube material, and both end surfaces of the resin foam sheet are joined in a butt shape via the melted ear portions of the resin film, and both ends of the joined resin foam sheet Face Characterized in that comprising the step of fusing together by melted ears of serial resin film.

  The invention according to claim 9 is a method for manufacturing a heat insulating pipe coated with a pipe material different from that of claim 8 above, wherein both ends of the strip-shaped resin foam sheet having a certain width are formed on the thick end portions. A step of supplying and arranging a pipe material on the resin foam sheet by arranging a heat insulating material formed by mounting the resin film so that the resin film becomes the lower surface, and an outer periphery of the pipe material so as to wrap the pipe material A step of curving the heat insulating material along the surface, a step of heating and melting the thick end portion of the resin film, and the heat insulating material is further bent to have a circular cross section so as to wrap the tube material and both ends of the resin foam sheet A step of joining the surfaces in a butt-like manner, and the thick end where the resin film is melted is pushed and pressed into the outer peripheral surface of the joint portion of the resin foam sheet curved in a circular cross section. Parts Butt shape junction, characterized by comprising a step of fusing.

  According to the first aspect of the present invention, the heat insulating material formed by laminating a resin film on one side of a strip-shaped resin foam sheet having a constant width is circular in cross section in the width direction so that the resin film becomes an outer cover. A heat insulating tube formed by bending the opposing end faces together and integrally joining, wherein the resin film is provided with an ear portion of a certain width protruding from the resin foam sheet, and the ear portion is Since the end faces are joined and fused by melting of the end portions of the resin foam sheet curved in a circular cross section, the end portions are melted. Is fused to the inner and outer walls of the foam wall of the foamed resin exposed on the opposite end faces of the resin foam sheet that is curved in a circular cross-section, and acts as if it were an anchor effect. Of area Combined with the strength, the joint strength of the joint surface of the resin foam sheet, particularly the joint strength of the outer peripheral portion where the acting force to separate the joint surface acts greatly can be greatly increased, and this heat insulating tube is to be expanded. Even if an internal pressure or the like acts, peeling from the joint surface can be prevented.

  In the heat insulating pipe configured as described above, according to the invention according to claim 2, ears protruding from both ends of the resin foam sheet are provided at both ends of the resin film, and both ears have a circular cross section. Since the end faces are joined and fused together by melting and solidifying these ears through the outer peripheral part between the opposite end faces of the curved resin foam sheet, the resin foam sheet curved in a circular cross section The melted ears can be fused and solidified to the foamed resin cell walls exposed at the end surfaces to be joined to each other, thereby further strengthening the joint strength of the joint surface of the resin foam sheet and having a circular cross section. The resin film layered on the outer peripheral surface of the resin foam sheet curved in the above manner has the melted both ends of the ears interposed at least at the outer peripheral portion between the end surfaces of the resin foam sheet to be joined to each other as described above. Therefore, both ends of the joint having a large fused area are bonded between the joint end surfaces of the resin film, which is coated in a covering state on the outer peripheral surface of the heat insulating tube formed by bending the resin foam sheet into a circular cross section. It becomes the structure which continued in the circumferential direction via, and can provide the heat insulation pipe | tube which has much stronger joint strength.

  On the other hand, according to the invention according to claim 3, as the resin film layered on the resin foam sheet, a resin film having both end portions formed at the thick end portions is used. Resin foam that is bent into the outer periphery of the pipe between the opposing end faces of the resin foam sheet whose section is curved in a circular cross-section and is curved in a circular cross-section with the opposing end faces of these thick ends Since the opposing end faces of the sheet are joined and fused, respectively, the molten resin at the thick end portion of the resin film compresses the opposing end portions on the outer peripheral surface of the resin foam sheet curved in a circular cross section. However, it is bonded by the fusion strength that is fused so as to bite into the bubbles of the foamed resin that is exposed at both ends, and the fusion strength that is bonded with a large area of the thick end portion and fused. Easy surface It is possible to achieve the relatively large bonding strength without fear of release.

  According to the invention which concerns on Claim 4, since the pipe materials, such as a drain hose and a water supply / drain pipe, are coat | covered with the heat insulation pipe | tube of the said Claims 1-3, the said heat insulation pipe | tube was used as the heat insulation pipe | tube of a pipe material. Insulated piping can be provided.

  The invention according to claim 5 is the method for manufacturing the heat insulating tube, wherein the end portion is protruded from the end portion in the width direction of the resin foam sheet over the entire surface of one side of the strip-shaped resin foam sheet having a constant width. Both ends of the resin foam sheet facing the heat insulating material formed by laminating the resin film formed on the width ear part by curving into a circular cross section along the width direction so that the resin film becomes an outer cover Since both ends of the resin foam sheet are joined in a butted manner with the ears of the resin film melted by heating interposed between the surfaces, the resin film in which the melted ears of the resin film are curved into a circular cross section The foamed resin can be fused to the inner and outer wall surfaces of the foamed resin bubble wall exposed on at least the outer peripheral part of the opposite end face of the foamed sheet, and this fused part acts as if it is an abutment of the resin foamed sheet. Shi The end faces through the ear portion and the molten can be firmly joined, relatively wide joint of the ear portion melted, it is possible to produce a large thermal insulation pipe of the combined joint strength and fusion area.

  In the manufacturing method of the heat insulation pipe | tube of the said Claim 5, invention which concerns on Claim 6 is the heat insulating material which makes the both ends ear | edge part of the resin film layered on the resin foam sheet protrude from the both ends of the resin foam sheet The both ends of the resin film are melted by heating between both end faces of the resin foam sheet that are curved in a circular cross section along the width direction so that the resin film becomes an outer cover. Since both ends of the resin foam sheet are joined and fused together by the melted both end ears, the melting of the melted ears with respect to the foam wall of the foamed resin exposed on the end surface of the resin foam sheet. The resin film attached to the outer peripheral surface of the resin foam sheet that is curved in a circular cross-section can be bonded and fused by enlarging the attachment portion and bonding the end faces of the resin foam sheet very firmly. It is possible to manufacture a thermal insulation pipe having the coupled with more powerful bonding strength obtained by continuously through both end ears were fused together which is interposed.

  On the other hand, according to the invention according to claim 7, a heat insulating material formed by laminating a resin film in which both end portions are formed as thick end portions on the entire surface of one surface of a strip-shaped resin foam sheet having a certain width, The resin film is curved into a circular cross section along the width direction so that it becomes an outer cover, and both end surfaces of the resin foam sheet are joined in a butted manner and the thick end portion of the resin film is heated and melted. The thick end portion of the resin film is formed by pressing the thick end portion into the outer peripheral surface of the joint portion of the resin foam sheet curved into a circular cross section and fusing it, and joining and fusing the thick end portions together. The melted resin melts into the foamed resin bubbles exposed at the opposite ends of the outer peripheral surface of the resin foam sheet having a circular cross section, and the thick end portions are joined and melted together. Combined with the contact area It is possible to produce a time greater thermal insulation pipe.

  The invention according to claim 8 is a method for manufacturing a heat insulating pipe covered with a pipe material such as a drain hose or a water supply / drain pipe, and an end portion of the resin foam sheet is formed on the entire surface of one surface of a strip-shaped resin foam sheet having a certain width. A heat insulating material formed by laminating a resin film formed on the edge portion of a certain width protruding from the end in the width direction is arranged so that the resin film becomes the lower surface, and the pipe material is supplied onto the resin foam sheet. The heat insulating material is curved along the outer peripheral surface of the tube material so as to wrap the tube material, and the ear portion of the resin film is heated and melted so that the melted ear portion is opposed to the butted shape of the heat insulating material. Since both end faces of the resin foam sheet are integrally fused by the melted ears in a state of being interposed at least at the outer peripheral part of the end face, the heat insulating pipe formed by covering the pipe with a heat insulating pipe having a high joint strength at the joint part It is possible to obtain.

  The invention according to claim 9 is a method for manufacturing a heat insulating pipe coated with a pipe material different from that of claim 8 above, wherein both ends of the strip-shaped resin foam sheet having a certain width are formed on the thick end portions. A heat insulating material formed by mounting the formed resin film is arranged so that the resin film becomes the lower surface, and the pipe material is supplied and arranged on the resin foam sheet, and the outer peripheral surface of the pipe material is wrapped around the pipe material. The heat insulating material is bent along the wall, and the thick end portion of the resin film is heated and melted, and the melted thick end portion is interposed in at least the outer peripheral portion of the end face facing the butted shape of the heat insulating material. Since both end surfaces of the resin foam sheet are fused together by the melted thick end portion, the opposite ends of the outer peripheral surface of the resin foam sheet in which the molten resin at the thick end portion of the resin film is curved in a circular cross section Exposed to In addition, the thick-walled end portions are joined to each other in a strong and wide area, and the pipe material is covered with a heat insulating pipe having a high joint strength. The heat insulation piping which becomes can be obtained.

The simplified perspective view of this invention heat insulation pipe | tube of the state which cut off the intermediate part of the length direction. The enlarged vertical front view of the principal part. The perspective view of the state which cut out the intermediate part of the length direction of a heat insulating material. The enlarged vertical front view of the state which cut out the intermediate part of the width direction. The enlarged vertical front view which shows another Example of a heat insulating material. The expanded vertical front view of the principal part of the heat insulation pipe | tube formed with the heat insulating material. The enlarged vertical front view which shows another Example of a heat insulating material. The expanded vertical front view of the principal part of the heat insulation pipe | tube formed with the heat insulating material. The vertical side view of the heat insulation piping formed by coat | covering a pipe material with a heat insulation pipe. The simplified side view which shows the manufacturing method of a heat insulation pipe | tube. FIG. 11 is an enlarged front view of the AA line in FIG. The BB line enlarged vertical front view in FIG. FIG. 11 is an enlarged longitudinal sectional front view taken along line CC in FIG. 10. The simplified side view which shows the manufacturing method of the heat insulation piping coat | covered with the heat insulation pipe. The perspective view for demonstrating the covering state.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a heat insulating pipe P1 is formed on the entire surface of one surface of a strip-shaped resin foam sheet 2 having a constant width and a constant thickness. A heat insulating material 1 (shown in FIGS. 3 and 4) formed by laminating a film is curved into a circular cross section along the width direction so that the resin film 3 becomes an outer cover, and the end surface of the opposing resin foam sheet 2 2a and 2b are joined together and joined together, and the end faces 2a and 2b of the resin foam sheet 2 are joined and fused together by fusing the end portions of the resin film 3. Has been done.

  Specifically, the width of the resin film 3 layered on one side of the resin foam sheet 2 is made wider than the width of the resin foam sheet 2, and both end ears 3a and 3b in the width direction are made of the resin foam sheet. 2 projecting outward from both ends in the width direction, and the projecting lugs 3a and 3b are heated and melted so as to be semi-molten to be contracted into thick-melting lugs 3a 'and 3b' having a cross-sectional lump shape. At the same time, the thick melted lugs 3a 'and 3b' are interposed between the opposite end surfaces 2a and 2b of the outer peripheral portion of the resin foam sheet 2 from both ends of the resin foam sheet 2 curved in a circular cross section. The other thickness of the resin film 3 superimposed on the other end surface 2b is welded to the end surface 2a by welding one thick melting lug 3a 'of the resin film 3 superimposed on the one end surface 2a by press-contacting 2b. The two melted ears 3b 'are fused to the end surface 2b and are joined together at the same time. The melted edge portions 3a 'and 3b' are fused together with a wide bonding area so that the opposite end surfaces of the resin foam sheet 2 in the heat insulating material 1 are melted at the thick melted ear portions 3a of the resin film 3. It is firmly joined and fixed through solidification of '3b'.

  An infinite number of bubble walls 21 with a very thin wall thickness of resin foam are exposed at both end faces 2a and 2b of the resin foam sheet 2, and the outer wall surfaces of these bubble walls 21 and further the cut bubble walls 21 are exposed. Thickened melted ears 3a 'and 3b' of the resin film 3 are fused and solidified on the inner wall surface of the resin film 3, and melted with respect to both end surfaces 2a and 2b of the resin foam sheet 2. ', 3b' is fixed as if it works like an anchor effect, and has a strong joint strength in combination with the thick fusion ears 3a ', 3b' which are joined and fused together with a wide area. Will have.

  In the above embodiment, two end portions 3a and 3b projecting from both ends of the resin foam sheet 2 are provided at both end portions of the resin film 3, but one end of the resin film 3 is provided as shown in FIG. One protruding ear portion 3a protruding from one end of the resin foam sheet 2 is provided only at the portion, and this ear portion 3a is heated and melted so as to be in a semi-molten state to form a thick melted ear portion 3a '. The thick foam lug 3a 'is interposed between the opposite end faces 2a and 2b of the resin foam sheet 2 curved in a circular cross section, and the resin foam sheet 2 is opposed through the thick melt lug 3a'. The end surfaces 2a and 2b may be integrally bonded and fixed as shown in FIG.

  The widths of the ear portions 3a and 3b of the resin film 3 for joining and fusing the opposing end faces 2a and 2b of the resin foam sheet 2 curved in a circular arc shape are not particularly limited, but the end face 2a of the resin foam sheet 2 It is desirable that the width is 2½ or more of the vertical width of 2b (the thickness of the resin foam sheet 2), and preferably the width is approximately equal to the vertical width of the end faces 2a and 2b of the resin foam sheet 2. In this case, when the molten melted ears 3a ′ and 3b ′ having a massive cross section are contracted by heating, the thick fused ears 3a ′ and 3b ′ having a large cross sectional area can be formed, and the circular sectional shape is obtained. When the end faces 2a and 2b opposed to each other of the curved resin foam sheet 2 are joined and fused together by the thick-melting lugs 3a ′ and 3b ′, the thick-melting lugs 3a ′ and 3b are joined. 'Can be widened to increase the bonding strength.

  Moreover, as shown in FIG. 7, without providing the said ear | edge part 3a, 3b which protrudes from the edge of the resin foam sheet 2 in the edge part of the said resin film 3 laminated | stacked on the single side | surface of the resin foam sheet 2, The width of the resin film 3 may be made equal to the width of the resin foam sheet 2, and both end portions of the resin film 3 may be formed at the thick end portions 3c and 3d.

  Thus, the heat insulating material 1 formed by laminating the resin film 3 having both end portions with the thick end portions 3c and 3d on one surface of the resin foam sheet 2 has a circular cross section so that the resin film 3 becomes an outer cover. As shown in FIG. 8, the both end thick ends 3c and 3d of the resin film 3 are melted by heating and the opposite end surfaces 2a and 2b of the resin foam sheet 2 are opposed to the opposite thick ends. The heat insulating tube structure is formed by joining together the facing surfaces of the parts 3c and 3d and integrally joining the facing end surfaces 2a and 2b of the resin foam sheet 2 by the fixing force of the melted thick end portions 3c and 3d.

  According to this heat insulating tube structure, the thick end portions 3c and 3d at both ends of the resin film 3 are air bubbles exposed on the outer peripheral surface of the corners on the outer peripheral side of the joint end surfaces 2a and 2b of the resin foam sheet 2 curved in a circular cross section. The molten resin is melted into the wall 21 and fused, and the opposed end surfaces of the thick end portions 3c and 3d are joined and fused in a butt-like manner with a relatively large area. There is a configuration in which the bonding strength between the end faces 2a and 2b of the resin foam sheet 2 fused to each other is reinforced by solidification of the molten resin at the thick end portions 3c and 3d to maintain a strong bonding strength. doing.

  As the resin foam sheet 2 constituting the heat insulating material 1, a polyolefin-based thermoplastic resin foam sheet such as polyethylene, polypropylene, and ethylene-propylene copolymer is used, and the resin film 3 is also a polyolefin-based thermoplastic resin film. Although used, other resin foam sheets and thermoplastic resin films may be used.

  And the said heat insulating material 1 is comprised by fusing the belt-shaped resin film 3 on the upper surface, making it a semi-molten state by heating, unwinding the belt-shaped resin foam sheet 2 currently wound by roll shape, Yes. 1 may be embossed as shown in FIG. 1 and the resin film 3 may be fused to the processed surface by lamination. The resin film 3 serves as a protective film for preventing the surface of the resin foam sheet 2 from being scratched.

  The heat insulation pipe P1 configured as described above may be used as a pipe as it is, but it is used as a heat insulation pipe for covering a pipe material such as a drain hose, a water supply pipe, and a drain pipe to constitute the heat insulation pipe P. It is preferable to do. For example, as shown in FIG. 9, the heat insulating pipe P1 is used as a heat insulating covering pipe of a flexible resin drain hose P2, and the heat insulating pipe P is formed.

  Next, a method for manufacturing the heat insulating pipe P1 will be described with reference to FIG. On one side of a long strip-shaped resin foam sheet 2 having a constant width and a constant thickness, a resin film 3 having both end ears 3a and 3b projecting outward from both ends of the resin foam sheet 2 is layered. The heat insulating material 1 is continuously supplied to the molding tool 10 with the resin film 3 facing downward while being rewound from the rolled state.

  The molding tool 10 has an inner surface (upper surface), which is a molding surface, gradually curved upward from an inlet side that receives the heat insulating material 1 toward an outlet side, and a middle portion in the lengthwise direction is a molded portion having a U-shaped cross section. 11 and the outlet side is formed in a molded section having a circular cross section, and the heat insulating material 1 supplied onto the molding tool 10 is, as shown in FIG. The curved molding surface is curved into a gentle cross-section arc shape from the center in the width direction toward both ends, and the degree of curvature increases as the molding tool 10 is advanced, and as shown in FIG. When the resin foam sheet 2 is bent, hot air is blown to both end surfaces 2a and 2b of the resin foam sheet 2 facing upward and both ear portions 3a and 3b of the resin film 3 projecting from both ends of the resin foam sheet 2 Melt by.

  Both ear portions 3a and 3b of the resin film 3 are contracted by heating with hot air to become thick fused ear portions 3a 'and 3b' having a cross-sectional lump shape, and the thick and melted ear portions 3a 'and 3b' have an arcuate cross section. The curved foamed resin sheet 2 is folded on the outer end surfaces of the two end surfaces 2a and 2b that are inclined upward, and is fused to the both end surfaces 2a and 2b.

  Further, from this state, the heat insulating material 1 is bent by the molding tool 10 so as to have a circular cross section, and both end faces 2a, 2b of the resin foam sheet 2 are fused to the both end faces 2a, 2b in a folded state. The thick-melting lugs 3a 'and 3b' are joined in a butt-like manner, and the thick-melting lugs 3a 'and 3b' are clamped by the joining force, so that both end faces of the resin foam sheet 2 are joined. 2a and 2b are exposed to the outer wall surface of the foam wall 21 of the foamed resin exposed on 2a and 2b and the inner wall surface connected to the cutting port of the foam wall 21, and are attached and adhered to the foam wall 21 and fused together. The ears 3a 'and 3b' are pressed against each other in a butted state, joined together while expanding the opposing end faces, and in this state, the heat insulating material curved in a circular cross section through the molding tool 10 Both end faces of 1 are firmly joined by solidification of the above-mentioned thick melted lugs 3a 'and 3b', and a resin film 3 can be obtained a heat insulating tube P1 became envelope.

  In addition, in the manufacturing method of the said heat insulation pipe | tube, the heat insulating material 1 which makes the ear | edge parts 3a and 3b of the both ends of the resin film 3 laminated | stacked on the single side | surface of the resin foam sheet 2 protrude from the both ends of the resin foam sheet 2 is used. Although it is used, as shown in FIG. 5, a long strip-shaped heat insulating material 1 in which only one ear 3a of the resin film 3 protrudes outward from one end of the resin foam sheet 2 is used as the molding tool 10 described above. When the resin film 3 is turned downward and supplied to the molding tool 10 in the same manner as described above, and when passing through the molding tool 10, it is bent into a U-shaped section by a U-shaped molding section. The molten foam is melted by blowing hot air to both end faces 2a, 2b of the resin foam sheet 2 and the ear 3a of the resin film 3 protruding from one end of the resin foam sheet 2, as described above. 3a ′ and 3b ′, and the thick melted ear 3a ′ melted in this semi-molten state Folded over on one end surface 2a of the fat foam sheet 2 are fused.

  Further, the heat insulating material 1 is bent by the molding tool 10 so as to have a circular cross section, and both end faces 2a and 2b of the resin foam sheet 2 are brought into contact with each other through the thick melted lugs 3a 'of the resin film 3. The two end surfaces 2a and 2b of the resin foam sheet 2 facing each other are pressed and joined together, and are integrally fused by the thick melted lugs 3a ′. The thick melted lug 3a 'is fused to the inner and outer wall surfaces of the foamed resin bubble wall 21 exposed on both end faces 2a and 2b of the resin foam sheet 2 in the same manner as described above. It is possible to obtain a heat insulating pipe P1 in which both end surfaces of the heat insulating material 1 passing through and curved in a circular cross section are firmly joined by solidification of the molten resin.

  In addition to the heat insulating material 1 provided with the ear portions 3a and 3b protruding from the end of the resin foam sheet 2 at the end of the resin film 3 layered on one side of the resin foam sheet 2, FIG. As shown in FIG. 3, the resin foam sheet 2 is formed by laminating a resin film 3 having a width equal to the width of the resin foam sheet 2 and having both end portions formed as thick end portions 3c and 3d. You may produce the heat insulation pipe | tube P1 with the heat insulating material 1. FIG. As described above, the heat insulating tube P1 is manufactured by supplying the molding tool 10 with the resin film 3 facing downward and supplying the molding tool 10 in the same manner as described above. When bent into a U-shaped cross section by a letter-shaped molded part, it melts by blowing hot air to both end faces 2a, 2b of the resin foam sheet 2 and both end thick ends 3c, 3d of the resin film 3 The thick end portions 3c and 3d melted in this semi-molten state are pressed against the outer corners of the resin foam sheet 2 where the thick end portions 3c and 3d are provided, and the molten resin is applied to the outer corner portions. The exposed foam resin is fused so as to bite into the inner and outer wall surfaces of the bubble wall 21.

  Further, the heat insulating material 1 is bent by the molding tool 10 so as to have a circular cross section, and the opposite end surfaces of the melted thick end portions 3c, 3d and both end surfaces 2a, 2b of the resin foam sheet 2 are butted together. Insulating material that is pressed and joined, and melted thick end portions 3c and 3d and both end surfaces of the resin foam sheet 2 are fused together and passed through the molding tool 10 in this state and curved into a circular cross section. It is possible to obtain a heat insulating pipe P1 in which both end faces of 1 are firmly joined by solidification of the molten resin.

  FIG. 14 and FIG. 15 show a method of manufacturing a heat insulating pipe P1 formed by covering a pipe material, for example, a drain hose P2 with the heat insulating pipe P1, and adopting a method of manufacturing the heat insulating pipe P1 by the molding tool 10, On one side of a long strip-shaped resin foam sheet 2 having a constant width and a constant thickness, a resin film 3 having both end ears 3a and 3b projecting outward from both ends of the resin foam sheet 2 is layered. The heat insulating material 1 is continuously supplied to the molding tool 10 with the resin film 3 facing downward while being rewound from the rolled state.

  Further, a drain hose (hereinafter referred to as a pipe material P2) is provided on the center of the other side of the resin foam sheet 2 on which the resin film 3 of the heat insulating material 1 supplied to the molding tool 10 is not layered. It supplies in the state which orient | assigned the direction to the length direction of the heat insulating material 1. FIG. While being passed through the molding tool 10 in this state, both ends 2a, 2b of the resin foam sheet 2 turned upward and bent with this resin foam when bent into a U-shaped section by a U-shaped molded section. By blowing hot air to both ear portions 3a and 3b of the resin film 3 protruding from both ends of the sheet 2, the thick melt ear portions 3a 'and 3b' are obtained as described above. 3b 'is folded on both end faces 2a, 2b of the resin foam sheet 2 and fused.

  From this state, the molded part 10 is continuously passed through a molded part having a circular cross section, and the heat insulating material 1 is bent so as to have a circular cross section along the outer peripheral surface of the pipe material P2. 1 and both ends 2a and 2b of the resin foam sheet 2 are joined in a butt-like manner through thick melted lugs 3a 'and 3b' of the resin film 3 fused to the both ends 2a and 2b, respectively. , Fuse. By passing the molding tool 10 in this state, both end surfaces of the heat insulating material 1 covered with the pipe material P2 are firmly joined by the solidification of the molten resin, and the heat insulating pipe P in which the resin film 3 becomes an outer cover is provided. Can be obtained.

  In addition, in the manufacturing method of the said heat insulation pipe | tube, the heat insulating material 1 which makes the ear | edge parts 3a and 3b of the both ends of the resin film 3 laminated | stacked on the single side | surface of the resin foam sheet 2 protrude from the both ends of the resin foam sheet 2 is used. Although being used, as shown in FIG. 5, the tube material P2 is covered with a long strip-shaped heat insulating material 1 in which only one ear 3a of the resin film 3 protrudes outward from one end of the resin foam sheet 2. The manufacturing method of the heat insulation piping P formed can be implemented similarly to the above.

  Further, as shown in FIG. 7, the resin film 3 having a width equal to the width of the resin foam sheet 2 on one side of the resin foam sheet 2 and both ends thereof being formed into thick end portions 3c and 3d. In order to manufacture the heat insulating pipe P in which the pipe material P2 is covered with the heat insulating material 1 formed by laminating, the heat insulating material 1 is supplied to the molding tool 10 with the resin film 3 facing downward, and the heat insulating material 1 is provided. The pipe P2 is supplied on the center part in the width direction of the steel sheet with its length direction directed to the length direction of the heat insulating material 1, and is insulated by the molding part having a U-shaped cross section while passing through the molding tool 10. When the material 1 is bent in a U-shaped cross section, it is melted by blowing hot air on both end faces 2a, 2b of the resin foam sheet 2 and both end thick ends 3c, 3d of the resin film 3, The thick end portions 3c and 3d melted in a semi-molten state are used as the thick end portions 3c at both ends of the resin foam sheet 2. The molten resin is pressed against the outer corner portion is provided with the 3d so as to bite into the inner and outer wall surfaces of the cell walls 21 of the foamed resin exposed to the outside corners to fuse.

  Furthermore, the heat insulating material 1 is bent by the molding tool 10 so as to have a circular cross section, and the pipe material P2 is wrapped with the heat insulating material 1 and the opposite end surfaces of the thick end portions 3c and 3d which are melted are opposed to both ends of the resin foam sheet 2. The surfaces 2a and 2b are pressed and joined in a butted manner, and the melted thick end portions 3c and 3d are fused to both end surfaces of the resin foam sheet 2, and the molding tool 10 is passed in this state. Thus, both end surfaces of the heat insulating material 1 coated with the pipe material P2 are firmly joined by solidification of the molten resin, and the heat insulating pipe P in which the resin film 3 is covered is obtained.

1 Thermal insulation material 2 Resin foam sheet
2a, 2b Both end faces 3 Resin film
3a, 3b ears at both ends
10 Molding tool
21 Bubble wall P Insulated piping
P1 heat insulation pipe
P2 pipe material

Claims (9)

  A heat insulating material formed by laminating a resin film on one side of a strip-shaped resin foam sheet having a certain width is curved in a cross-sectional circle shape in the width direction so that the resin film becomes an outer cover, and the opposite end surfaces are butted together. The resin film is provided with a fixed-width ear portion protruding from the resin foam sheet, and the resin film is curved into a circular cross section by melting and solidifying the ear portion. A heat insulating tube characterized in that the opposed end surfaces of the foam sheet are joined together.   Ear portions projecting from both ends of the resin foam sheet are provided at both ends of the resin film, and the end faces of the resin foam sheets that are curved into a circular cross-section by melting and solidifying both ear portions are integrally joined together. The heat insulation pipe according to claim 1, wherein   A heat insulating material formed by laminating a resin film on one side of a strip-shaped resin foam sheet having a certain width is curved in a cross-sectional circle shape in the width direction so that the resin film becomes an outer cover, and the opposite end surfaces are butted together. The both ends of the resin film are formed into thick end portions, and the thick end portions are curved between the opposing end surfaces of the resin foam sheet having a circular cross section. In addition, the end surfaces of the thick end portions and the opposite end surfaces of the resin foam sheet curved in a circular cross-section are joined and fused to the outer periphery of the tube. Insulated pipe characterized by that.   The heat insulation pipe according to claim 1, 2 or 3, wherein a pipe material such as a drain hose or a water supply / drainage pipe is covered with the heat insulation pipe.   Heat insulation formed by laminating a resin film formed on the entire surface of one side of a strip-shaped resin foam sheet having a constant width, with an end projecting from the end in the width direction of the resin foam sheet and having a constant width. A step of bending the material in a circular arc shape along the width direction so that the resin film becomes an outer cover, and heating an ear portion of the resin film protruding from an end portion of the resin foam sheet in the curved heat insulating material The process of melting and fusing this ear part to the end face of the resin foam sheet, and further bending the heat insulating material until the cross-section is circular, the both end faces of the resin foam sheet through the melted ear part of the resin film A method of manufacturing a heat insulating pipe, comprising: joining in a butt-like manner and fusing both end faces of the joined resin foam sheets together by melted ears of the resin film.   A heat insulating material formed by laminating a resin film in which both ends are protruded from both ends in the width direction of the resin foam sheet and formed at the ears of a constant width on one entire surface of a strip-shaped resin foam sheet having a constant width. Is bent into a circular arc cross section, and both ends of the resin film are heated and melted to be fused to both end faces of the resin foam sheet, and then the heat insulating material is further bent into a circular cross section to obtain a resin foam. 6. The method for manufacturing a heat insulating tube according to claim 5, wherein both end faces of the sheet are joined and fused by means of both ends of the melted resin film.   A heat insulating material formed by laminating a resin film in which both end portions are formed into thick end portions on the entire surface of one surface of a strip-shaped resin foam sheet having a certain width, and the width direction so that the resin film becomes an outer cover The step of bending the cross-section arc along the arc, the step of heating and melting the thick end portion of the resin film, and the heat insulating material is further bent until the cross-section is circular, so that both end faces of the resin foam sheet are butted together The step of joining and the thick end portion where the resin film is melted are pushed and fused to the outer peripheral surface of the joint portion of the resin foam sheet curved in a circular cross section, and the thick end portions are joined in a butted manner A method for manufacturing a heat insulating tube, comprising the steps of fusing.   Heat insulation formed by laminating a resin film formed on the entire surface of one side of a strip-shaped resin foam sheet having a constant width, with an end projecting from the end in the width direction of the resin foam sheet and having a constant width. Supplying the pipe material on the resin foam sheet by arranging the material so that the resin film is on the lower surface, and arranging the heat insulating material along the outer peripheral surface of the pipe material so as to wrap the pipe material; The step of heat-melting the ears of the resin film and fusing it to the end face of the resin foam sheet, the heat insulating material is further curved until it has a circular cross-section, wrapping the tube material, and the resin foam sheet at both end faces A tubular material characterized by comprising the steps of joining in a butt-like manner through the melted ears of the film, and fusing both ends of the joined resin foam sheet together by the melted ears of the resin film. Manufacturing method of the heat-insulated pipe.   A foamed resin foam is formed by placing a heat insulating material on the entire surface of one side of a strip-shaped resin foam sheet having a certain width so that both ends are thick end parts so that the resin film is on the bottom surface. A step of supplying and arranging the pipe material on the sheet; a step of bending the heat insulating material along the outer peripheral surface of the pipe material so as to wrap the pipe material; a step of heating and melting the thick end portion of the resin film; Bending the material until it has a circular cross-section, wrapping the tube material and joining both end faces of the resin foam sheet in abutting manner, and bending the thick end of the resin film into a circular cross-section A heat-insulated pipe coated with a pipe material characterized by comprising the steps of: fusing the outer peripheral surface of the resin foam sheet into the outer peripheral surface of the resin foam sheet; Production method.

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