JP6410184B2 - Multilayer heat recovery article and connection structure - Google Patents

Description

  The present invention relates to a multilayer heat recovery article and a connection structure.

  A tube-shaped multilayer heat recovery article including a cylindrical base material layer and an adhesive layer laminated on the inner peripheral surface of the base material layer is used for coating an object to be covered such as an electric wire. This multilayer heat recovery article is extrapolated to the object to be coated and heated to heat shrink in the radial direction along the shape of the object to be coated, and at the same time, the fluidized adhesive layer is between the substrate layer and the object to be coated. Fill. Due to the heat dissipation after the heating, the multilayer heat recovery article solidifies the adhesive layer and covers the object to be coated. The coating obtained by the multilayer heat recovery article performs functions such as mechanical protection, insulation, waterproofing, and corrosion protection of the object to be coated.

  This multilayer heat recovery article is required to have a simple coating operation and excellent adhesion to the object to be coated after coating. In response to such a requirement, for example, an adhesive layer made of an adhesive composition having a thermoplastic resin having a specific range of melt flow rate (MFR) and an organically treated layered silicate and having a specific range of shear viscosity; A multilayer heat recovery article comprising a base material layer has been proposed (see Japanese Patent Application Laid-Open No. 2014-69522). In this multilayer heat recovery article, since the adhesive layer has an appropriate fluidity when heated, it can be easily filled between the base material layer and the object to be coated, and as a result, the coating operation can be simplified by shortening the heating time. In addition, since it is difficult to form a gap with the object to be coated after coating, the adhesion can be improved.

JP 2014-69522 A

  However, when the above-mentioned conventional multilayer heat recovery article includes a flat terminal, specifically, for example, the covering target is a connection part between an electric wire and a flat terminal, a connection part between flat terminals, etc. In this case, the distance between the surface of the terminal and the base material layer tends to be large. In particular, the distance between the center portion in the width direction of the surface of the terminal and the base material layer tends to increase. Therefore, the conventional multilayer heat-recovery article is pressed with pliers or the like from the outside until the fluidized adhesive layer fills the space between the base material layer and the object to be coated simultaneously with or after the heating. It is necessary to approach the object to be covered. Therefore, the conventional multilayer heat-recovery article cannot be said to be easily coated when the coating target includes a flat terminal as described above, and the heating and compression are insufficient, and There is a risk that a gap will be formed between them and the adhesion will be lowered.

  This invention is made | formed based on the said situation, and it aims at providing the multilayer heat recovery article which can be coat | covered easily and reliably, even when a coating object contains a flat terminal.

  A multilayer heat recovery article according to an aspect of the present invention made to solve the above problems includes a multilayer base material layer and a multilayer heat layer including an adhesive layer laminated on the inner peripheral surface of the base material layer. In the recovery article, the base material layer has one or a plurality of ridges protruding toward the adhesive layer and continuing in the axial direction.

  In addition, a connection structure according to another aspect of the present invention, which has been made to solve the above problems, includes a flat terminal, one or more conductors electrically connected to the terminal, the terminal, and 1 Or a connection structure comprising a tube attached to a plurality of conductors, wherein the tube is obtained by heat-shrinking the multilayer heat recovery article, and the protruding portion is opposed to at least one surface of the terminal. doing.

  The multilayer heat recovery article according to one embodiment of the present invention can be easily and reliably coated even when the object to be coated includes a flat terminal. The connection structure which concerns on another aspect of this invention can form the connection structure which coat | covered the flat terminal and the conductor with the tube easily and reliably, and is excellent in the adhesiveness of the said tube, a terminal, and a conductor.

It is a typical sectional view showing the multilayer heat recovery article concerning one mode of the present invention. It is a typical perspective view of the multilayer heat recovery article of FIG. It is a typical top view which shows the connection structure which concerns on another one aspect | mode of this invention. It is typical sectional drawing in the X1-X1 line | wire of FIG. It is typical sectional drawing in the X2-X2 line | wire of FIG.

[Description of Embodiment of the Present Invention]
A multilayer heat recovery article according to an aspect of the present invention is a multilayer heat recovery article comprising a cylindrical base material layer and an adhesive layer laminated on the inner peripheral surface of the base material layer, The layer protrudes toward the adhesive layer and has one or a plurality of ridges continuous in the axial direction.

  When the object to be coated includes a flat terminal, the multilayer heat recovery article is heated by extrapolating so that at least one surface of the terminal and the protruding portion of the base material layer face each other, and then heating. The distance between the material layer and the object to be coated is reduced by the ridges. Therefore, the multilayer heat recovery article can easily fill the fluidized adhesive layer between the base material layer and the object to be coated, can simplify heating and compression as a coating operation, and can be applied between the object to be coated after coating. Since it is difficult to form a gap in the film, the adhesion can be improved. Therefore, the multilayer heat recovery article can be easily and reliably coated even when the object to be coated includes a flat terminal.

  It is preferable that the base material layer has a cylindrical shape and has at least one pair of the ridges at positions facing each other. Thus, when the base material layer is cylindrical, when the object to be covered is a connection portion including a flat terminal and an electric wire, the distance between the portion other than the protruding portion of the base material layer and the electric wire varies. Therefore, the distance between the portion other than the ridges of the base material layer and the object to be covered is difficult to increase. In addition, by having the base material layer have at least one pair of the ridges facing each other, by heating in a state where the both sides of the terminal and the pair of ridges are opposed to each other, The distance between the base material layer and the both surfaces of the terminal can be reduced by the pair of protruding strips. Therefore, when the object to be covered includes a flat terminal, it can be covered more easily and reliably, and also when the object to be covered is a connecting portion including the terminal and the electric wire, it can be easily and reliably covered.

  The multilayer heat recovery article may have a marking at a position corresponding to the ridges on the outer peripheral surface of the base material layer. Thus, it becomes easy to make the surface of a flat terminal and a protruding item | line part oppose at the time of a coating | cover by having marking in the position corresponding to the protruding item | line part of the outer peripheral surface of a base material layer.

  The total thickness of the base material layer and the adhesive layer is preferably substantially constant in the circumferential direction. Thus, when the total thickness of the base material layer and the adhesive layer is substantially constant in the circumferential direction, it is possible to suppress catching when the coating target is inserted inside the multilayer heat recovery article. Here, “the total thickness is substantially constant in the circumferential direction” means that the difference between the maximum total thickness and the minimum total thickness is 50% or less of the average total thickness in the circumferential direction.

  A connection structure according to another aspect of the present invention includes a flat terminal, one or more conductors electrically connected to the terminal, and a tube attached to the terminal and the one or more conductors. The tube is obtained by heat-shrinking the multilayer heat recovery article, and the protruding portion is opposed to at least one surface of the terminal.

  In the connection structure, a flat terminal and a conductor electrically connected to the terminal are covered with a tube obtained by thermally shrinking the multilayer heat recovery article, so that the flat terminal and the conductor are covered with a tube. The coated connection structure can be easily and reliably formed, and the adhesion between the tube, the terminal and the conductor is excellent.

  It is preferable that the multilayer heat recovery article has at least one pair of the protruding portions, and the pair of protruding portions respectively face both surfaces of the terminal. As described above, the multilayer heat recovery article has at least one pair of protrusions, and the pair of protrusions faces the both surfaces of the terminal, thereby improving the adhesion on both surfaces of the terminal. .

[Details of the embodiment of the present invention]
Hereinafter, a multilayer heat recovery article and a connection structure according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
<Multilayer heat recovery article>
The multilayer heat recovery article shown in FIGS. 1 and 2 is a tube-shaped multilayer heat recovery article that is reduced in diameter by being heated. The multilayer heat recovery article includes a cylindrical base material layer 1 and an adhesive layer 2 laminated on the inner peripheral surface of the base material layer 1. The base material layer 1 protrudes to the adhesive layer 2 side, and has a pair of ridges 3 that are continuous in the axial direction at positions facing each other. In addition, the multilayer heat recovery article has a colored layer 4 as a marking at a position corresponding to the ridges 3 on the outer peripheral surface of the base material layer 1.

  The average inner diameter and average thickness of the multilayer heat-recovery article can be changed as appropriate according to the application. Moreover, as an average internal diameter of the said multilayer heat recovery article, it can be 2 mm or more and 60 mm or less, for example. Moreover, as an average thickness of the said multilayer heat recovery article, it can be 0.3 mm or more and 5 mm or less, for example. Here, the “inner diameter” of the multilayer heat recovery article means a diameter of a perfect circle having the same area as the inside of the adhesive layer in a cross section orthogonal to the axial direction.

(Base material layer)
The base material layer 1 performs functions such as mechanical protection, insulation, and corrosion protection of the coating target after coating. The base material layer 1 is good to contain polyethylene, polyester, polyamide, polyvinyl chloride, or a fluororesin as a main component. These resins may be used alone or in combination. The base material layer 1 can be provided with appropriate heat shrinkability by containing the exemplified resin, and the exemplified resin can be obtained at a relatively low cost, and thus the manufacturing cost can be suppressed. Here, the “main component” is a component having the largest content, for example, a component having a content of 50% by mass or more.

  In the fluororesin, at least one hydrogen atom bonded to the carbon atom constituting the repeating unit of the polymer chain is substituted with a fluorine atom or an organic group having a fluorine atom (hereinafter also referred to as “fluorine atom-containing group”). Say things. The fluorine atom-containing group is a group in which at least one hydrogen atom in a linear or branched organic group is substituted with a fluorine atom, and examples thereof include a fluoroalkyl group, a fluoroalkoxy group, and a fluoropolyether group. .

  The “fluoroalkyl group” means an alkyl group in which at least one hydrogen atom is substituted with a fluorine atom, and includes a “perfluoroalkyl group”. Specifically, a “fluoroalkyl group” is a group in which all hydrogen atoms of an alkyl group are substituted with fluorine atoms, and all hydrogen atoms other than one hydrogen atom at the end of the alkyl group are substituted with fluorine atoms. Group and the like.

  The “fluoroalkoxy group” means an alkoxy group in which at least one hydrogen atom is substituted with a fluorine atom, and includes a “perfluoroalkoxy group”. Specifically, a “fluoroalkoxy group” is a group in which all hydrogen atoms of an alkoxy group are substituted with fluorine atoms, and all hydrogen atoms other than one hydrogen atom at the end of the alkoxy group are substituted with fluorine atoms. Group and the like.

  The “fluoropolyether group” is a monovalent group having a plurality of alkylene oxide chains as repeating units and having an alkyl group or a hydrogen atom at the terminal, and the alkylene oxide chain and / or the terminal alkyl group or hydrogen. A monovalent group having a group in which at least one hydrogen atom in an atom is substituted with a fluorine atom. “Fluoropolyether group” includes “perfluoropolyether group” having a plurality of perfluoroalkylene oxide chains as repeating units.

  Moreover, it is preferable to add a flame retardant to the base material layer 1 for the purpose of improving the flame retardancy. Furthermore, you may add another additive to this base material layer 1 as needed. Examples of such additives include antioxidants, copper damage inhibitors, lubricants, colorants, heat stabilizers, ultraviolet absorbers and the like.

(Flame retardants)
Examples of flame retardants include chlorinated flame retardants such as chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenyl, and perchloropentacyclodecane, 1,2-bis (2,3,4,5,6-pentabromophenyl) Ethane, ethylenebispentabromobenzene, ethylenebispentabromodiphenyl, tetrabromoethane, tetrabromobisphenol A, hexabromobenzene, decabromobiphenyl ether, tetrabromophthalic anhydride, polydibromophenylene oxide, hexabromocyclodecane, ammonium bromide Brominated flame retardants such as triallyl phosphate, alkyl allyl phosphate, alkyl phosphate, dimethyl phosphonate, phosphorate, halogenated phosphorate ester, trimethyl phosphate, tributyl phosphate Fate, trioctyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricresyl phosphate, cresyl phenyl phosphate, triphenyl phosphate, tris (chloroethyl) phosphate, tris (2-chloropropyl) phosphate, tris (2,3- Dichloropropyl) phosphate, tris (2,3-dibromopropyl) phosphate, tris (bromochloropropyl) phosphate, bis (2,3 dibromopropyl) 2,3 dichloropropyl phosphate, bis (chloropropyl) monooctyl phosphate, polyphosphonate , Phosphoric acid esters such as polyphosphate, aromatic polyphosphate, dibromoneopentyl glycol, tris (diethylphosphinic acid) aluminum Other compounds such as hydrogen compounds, phosphonate polyols, phosphate polyols, polyols such as halogen elements, nitrogen compounds such as melamine cyanurate, triazine, isocyanurate, urea, guanidine, silicone polymers, ferrocene, fumaric acid, maleic acid, etc. Compound etc. are mentioned. Among these, halogen-based flame retardants such as brominated flame retardants and chlorine-based flame retardants are preferable. Bromine-based flame retardants and chlorine-based flame retardants may be used alone or in combination of two or more.

  As a minimum of content of a flame retardant in substrate layer 1, 1 mass part is preferred to 100 mass parts of resin ingredients, and 5 mass parts is more preferred. On the other hand, as an upper limit of the said content, 50 mass parts is preferable with respect to 100 mass parts of resin components, and 40 mass parts is more preferable. When the said content is smaller than the said minimum, there exists a possibility that the effect of flame retardance provision may not be acquired. Conversely, if the content exceeds the upper limit, the toughness and elongation of the multilayer heat recovery article may be reduced.

(Antioxidant)
Examples of the antioxidant include phenol compounds, amine compounds, hindered amine compounds, hindered phenol compounds, salicylic acid derivatives, benzophenone compounds, benzotriazole compounds, and hindered amine compounds particularly excellent in cross-linking inhibition effect. Compounds are preferably used. As the antioxidant, besides the above-mentioned compounds, sulfur compounds and phosphite compounds can be used alone or in combination.

  Moreover, as a minimum of content of the antioxidant in the base material layer 1, 1 mass part is preferable with respect to 100 mass parts of resin components, and 1.5 mass parts is more preferable. On the other hand, as an upper limit of the said content, 5 mass parts is preferable with respect to 100 mass parts of resin components, and 3 mass parts is more preferable. When the said content is smaller than the said minimum, the base material layer 1 becomes easy to oxidize and there exists a possibility that the said multilayer heat recovery article may deteriorate. Moreover, when the said content exceeds the said upper limit, there exists a possibility that a bloom and bleed may generate | occur | produce in the base material layer 1. FIG.

  Examples of the phenolic compound used as the antioxidant include pentaerythritol tetrakis [3-3,5-di-tert-butyl-4-hydroxyphenyl) propionate], tetrakis- [methylene-3- (3′5′-di-). tert-butyl-4′-hydroxyphenyl) propionate] methane, triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 6- (4-hydroxy-3, And 5-di-tert-butyl-anilino) -2,4-bis-octyl-thio-1,3,5-triazine.

  Examples of amine compounds used as antioxidants include 4,4 ′ (α, α-dimethylbenzyl) diphenylamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 6-ethoxy-2,2 , 4-Trimethyl-1,2-dihydroquinoline, N- (1,3-dimethylbutyl) -N′-phenyl-1,4-phenylenediamine, N-isopropyl-N′-phenyl-1,4-phenylenediamine Etc.

  As average thickness of parts other than the protruding item | line part 3 of the base material layer 1, it is 0.1 mm or more and 4.8 mm or less, for example. When the average thickness is smaller than the lower limit, the strength of the multilayer heat recovery article may be reduced. Conversely, when the average thickness exceeds the upper limit, the flexibility of the multilayer heat recovery article may be reduced.

(Ridge section)
The ridge portion 3 is formed by projecting a part of the base material layer 1 in an arc shape on the adhesive layer 2 side, that is, in the radial direction on the center side.

  As a minimum of the height of the protruding item | line part 3, 0.8 mm is preferable and 2 mm is more preferable. On the other hand, the upper limit of the height of the ridge 3 is preferably 4 mm, and more preferably 3 mm. Moreover, as a minimum of ratio of the height of the protruding item | line part 3 with respect to the average internal diameter of the said multilayer heat recovery article, 10% is preferable and 25% is more preferable. On the other hand, the upper limit of the ratio is preferably 50%, more preferably 35%. When the height and / or the ratio is smaller than the lower limit, the distance between the base material layer 1 and the surface of the flat terminal becomes large when the multilayer heat recovery article is coated, and the fluidized adhesive layer 2 It may be difficult to fill with. Conversely, when the height and / or ratio exceeds the upper limit, the base layer 1 and the object to be coated come into contact with each other without the adhesive layer 2 after the coating, and the multilayer heat recovery article coated There is a risk of lowering adhesion with the object to be coated. Here, the “height of the ridge portion” refers to a portion other than the ridge portion 3 of the base material layer 1 from the maximum thickness of the base material layer 1 in the ridge portion 3 in a cross section of arbitrary 10 points orthogonal to the axial direction. The average value of the value obtained by subtracting the average thickness of the portion.

  The lower limit of the circumferential length of the ridge 3 is preferably 2 mm, and more preferably 5 mm. On the other hand, the upper limit of the length is preferably 10 mm, and more preferably 7 mm. Moreover, as a minimum of ratio of the circumferential direction length of the protruding item | line part 3 with respect to the average internal diameter of the said multilayer heat recovery article, 10% is preferable and 25% is more preferable. On the other hand, the upper limit of the ratio is preferably 50%, more preferably 35%. When the width and / or the ratio is smaller than the lower limit, the distance between the base material layer 1 and the surface of the plate-shaped terminal is increased when the multilayer heat recovery article is coated, and the fluidized adhesive layer 2 is used. Filling may be difficult. Conversely, when the height and / or ratio exceeds the upper limit, the flexibility of the base material layer 1 may be reduced. Here, the “circumferential length of the ridge portion” is a base material layer in a region where the thickness is 10% or more larger than the average thickness of the base material layer 1 as a whole in a cross section at any 10 points orthogonal to the axial direction. The average value of the circumferential direction length in the outer peripheral surface of 1 is said.

(Adhesive layer)
The adhesive layer 2 is laminated on the inner peripheral surface of the base material layer 1, and improves the waterproof property and the like by filling the space between the base material layer 1 and the object to be coated when the multilayer heat recovery article is covered. The adhesive layer 2 contains a thermoplastic resin as a main component, and further contains an additive as necessary. Since the kind and content of the additive can be the same as those of the additive of the base material layer 1, description thereof is omitted.

  The average thickness of the portion of the adhesive layer 2 that does not come into contact with the ridges 3 is, for example, 0.1 mm or more and 4.9 mm or less. When the said average thickness is smaller than the said minimum, there exists a possibility that the adhesiveness of the said multilayer heat recovery article | coat coated and the coating object may fall. On the contrary, when the average thickness exceeds the upper limit, the adhesive layer 2 fluidized at the time of coating the multilayer heat recovery article may leak out.

  Examples of the thermoplastic resin that is the main component of the adhesive layer 2 include ethylene-vinyl acetate copolymer (EVA), polyamide, ethylene-ethyl acrylate copolymer (EEA), and saturated copolymer polyester. As said thermoplastic resin, ethylene-vinyl acetate copolymer and polyamide are preferable. The said thermoplastic resin can be used individually by 1 type or in combination of 2 or more types.

  The lower limit of the melt flow rate (MFR) of the thermoplastic resin is preferably 1 g / 10 minutes, and more preferably 80 g / 10 minutes. On the other hand, the upper limit of the MFR is preferably 1,000 g / 10 minutes, more preferably 800 g / 10 minutes. When the MFR is smaller than the lower limit, filling between the base material layer 1 and the coating target with the fluidized adhesive layer 2 may be difficult. Conversely, when the MFR exceeds the upper limit, it may be difficult to form the adhesive layer 2 during the production of the multilayer heat recovery article. Moreover, there exists a possibility that the adhesive bond layer 2 fluidized at the time of the coating of the multilayer heat recovery article may leak out. Here, “MFR” means an extrusion type plastometer defined in JIS-K6760: 1997 “polyethylene test method”, and JIS-K7210: 1997 “plastic-thermoplastic melt mass flow rate (MFR) and melt volume. It is a value measured under conditions of a temperature of 150 ° C. and a load of 2.16 kg in accordance with the “flow rate (MVR) test method”.

  In the multilayer heat recovery article, the total thickness of the base material layer 1 and the adhesive layer 2 is substantially constant in the circumferential direction. That is, the outer periphery of the base material layer 1 and the inner periphery of the adhesive layer 2 are concentric circles. The total thickness of the base material layer 1 and the adhesive layer 2 is the same as the average thickness of the multilayer heat recovery article.

  The adhesive layer 2 is preferably laminated on the entire inner peripheral surface of the base material layer 1. That is, the entire inner peripheral surface of the base material layer 1 is preferably covered with the adhesive layer 2 and not exposed to the inside of the multilayer heat recovery article. As described above, since the adhesive layer 2 is laminated on the entire inner peripheral surface of the base material layer 1, it becomes easy to fill the fluidized adhesive layer 2 between the base material layer 1 and the coating target. The adhesion between the multilayer heat recovery article after coating and the object to be coated can be improved.

(Colored layer)
The colored layer 4 is laminated on the outer peripheral surface of the base material layer 1 in a strip shape continuously in the axial direction. The colored layer 4 has a color different from that of the base material layer 1 and makes it easy to recognize the position of the ridge portion 3 from the outer surface. It does not specifically limit as a material of the colored layer 4, It can form with a commercially available coating material, a tape, etc.

  The average length in the circumferential direction of the colored layer 4 is, for example, 2 mm or more and 10 mm or less. Moreover, as ratio of the circumferential direction average length of the colored layer 4 with respect to the average internal diameter of the said multilayer heat recovery article, it is 10% or more and 35% or less, for example. The average length of the colored layer 4 in the circumferential direction may be the same as the circumferential length of the ridge 3. Moreover, the center of the circumferential direction is good for the colored layer 4 and the protruding item | line part 3 corresponding to this colored layer 4 from the viewpoint of making it easy to recognize the exact position of the protruding item | line part 3. . In addition, the average thickness of the colored layer 4 is 1 mm or less, for example.

<Method for producing multilayer heat recovery article>
The manufacturing method of the multilayer heat recovery article includes, for example, a step of forming a multilayer body including a cylindrical base material layer and an adhesive layer laminated on the inner peripheral surface of the base material layer (multilayer body forming step); In the position corresponding to the step of expanding the inner diameter of the multilayer body (diameter expansion process), the step of fixing the shape of the expanded multilayer body (fixing process), and the ridges on the outer peripheral surface of the base material layer And a method including a step of forming a marking (marking formation step). The manufacturing method of the multilayer heat recovery article may further include a step of crosslinking the base material layer (crosslinking step) after the multilayer body forming step.

(Multilayer body forming process)
In this step, a multilayer body including a cylindrical base material layer and an adhesive layer laminated on the inner peripheral surface of the base material layer is formed. As a method of forming the multilayer body, for example, a method of co-extruding a resin composition for a base layer and a resin composition for an adhesive layer with a melt extrusion molding machine, and a resin composition for a base layer with a melt extrusion molding machine Extruding to form a base material layer, laminating an adhesive layer on the inner peripheral surface of the base material layer, and extruding the adhesive layer resin composition with a melt extruder to form an adhesive layer The method etc. which laminate | stack a base material layer on the outer peripheral surface of an agent layer are mentioned.

  As the resin composition for the base layer and the resin composition for the adhesive layer, a commercially available resin composition may be used as it is, and the resin component and the additive added as necessary may be an open roll, a pressure kneader, a short You may prepare by mixing with an axial mixer, a twin-screw mixer, etc.

  In this step, a spider die may be used for extruding the base material layer. As this spider die, by using a die hole having a ring part and a pair of convex parts protruding to the inner peripheral surface side of the ring part, a base having a convex part easily and reliably is used. A material layer can be formed.

  The dimensions of the multilayer body can be designed according to the application. The average inner diameter of the base material layer of the multilayer body is, for example, 1 mm or more and 60 mm or less, and the maximum wall thickness of the base material layer other than the ridges is 0.1 mm or more and 10 mm or less.

(Diameter expansion process)
In this step, the inner diameter of the multilayer body obtained in the multilayer body forming step is increased. Examples of the method for expanding the diameter of the multilayer body include a method of applying an internal pressure in a state where the multilayer body is heated to a temperature equal to or higher than the melting point of the resin component. Examples of a method for applying an internal pressure to the multilayer body include a method for introducing compressed air into the interior and a method for inserting a metal rod into the interior. The ratio of the average inner diameter of the multilayer body after diameter expansion to the average inner diameter of the multilayer body before diameter expansion is, for example, 2 or more and 7 or less.

(Fixing process)
In this step, the shape of the expanded multilayer body is fixed. Examples of a method for fixing the shape of the expanded multilayer body include a method of cooling the expanded multilayer body to a temperature below the melting point of the resin component.

(Crosslinking process)
In this step, the heat resistance is improved by crosslinking the base material layer. Examples of the method for crosslinking the substrate layer include crosslinking by irradiation with ionizing radiation, chemical crosslinking, and thermal crosslinking.

(Marking formation process)
In this step, the marking is formed at a position corresponding to the protruding portion on the outer peripheral surface of the base material layer. As a method of forming the marking, for example, a method of applying a commercially available paint at a position corresponding to the protruding portion on the outer peripheral surface of the base material layer can be cited.

<Advantages>
In the case where the multilayer heat recovery article is a connecting part including a flat terminal and a cylindrical electric wire, the multilayer heat recovery article is extrapolated so that both sides of the terminal and the pair of protruding strips 3 face each other. The distance between the base material layer 1 and the both surfaces of the terminal can be reduced by the ridges 3 by heating at. Further, the multilayer heat recovery article can easily face the both surfaces of the terminal and the ridges by the colored layer 4. Furthermore, since the multilayer heat recovery article has a cylindrical base material layer 1, it is possible to reduce variations in the distance between the portion of the base material layer 1 other than the ridges 3 and the electric wires. It is difficult for the distance between the portion other than the ridges 3 and the object to be covered to increase. Furthermore, the multilayer heat-recovery article can suppress catching at the time of insertion of the connecting portion into the inside because the total thickness of the base material layer 1 and the adhesive layer 2 is substantially constant in the circumferential direction. Therefore, the multilayer heat recovery article can be easily and reliably covered when the object to be covered includes a flat terminal, and easily and reliably when the object to be covered is a connection portion including the above and a cylindrical electric wire. Can be coated.

[Second Embodiment]
<Connection structure>
The connection structure shown in FIGS. 3, 4, and 5 includes a flat terminal 5, one conductor 6 electrically connected to the terminal 5, and a tube 7 attached to the terminal 5 and the conductor 6. With. The tube 7 is obtained by heat-shrinking the multilayer heat recovery article having a pair of ridges, and the pair of ridges 13 are opposed to both surfaces of the terminal 5.

(Terminal)
Although it does not specifically limit as the flat terminal 5, For example, a part of printed wiring board, a connection connector, etc. are mentioned. The average thickness of the terminal 5 is, for example, not less than 0.5 mm and not more than 10 mm.

(conductor)
The conductor 6 has a circular cross-sectional shape and is electrically connected to the terminal 5. Although it does not specifically limit as the conductor 6, For example, metal wires, such as copper, copper alloy, aluminum, aluminum alloy, etc. are mentioned. The metal wire corresponds to, for example, an end portion of a conductor from which the insulated wire is stripped. The average diameter of the conductor 6 is, for example, not less than 0.5 mm and not more than 10 mm. Note that the terminal 5 and the conductor 6 may be in contact with each other, or may be connected by thermal fusion or ultrasonic fusion, and are electrically connected via solder, conductive adhesive, crimp terminals, etc. (not shown). You may connect to.

(tube)
The tube 7 is obtained by heat-shrinking the multilayer heat recovery article having a pair of ridges. The tube 7 includes a heat-shrinkable base material layer 11 and an adhesive layer 12 laminated on at least a part of the inner peripheral surface of the base material layer 11. The base material layer 11 protrudes to the adhesive layer 12 side, and has a pair of protruding ridges 13 that are continuous in the axial direction.

[Base material layer]
The base material layer 11 is obtained by heat shrinking the base material layer of the multilayer heat recovery article. The base material layer 11 protrudes to the adhesive layer 12 side, and has a pair of protruding ridges 13 that are continuous in the axial direction. The base material layer 11 constitutes the outermost layer of the tube 7 and fulfills functions such as mechanical protection and insulation of the terminals 5 and the conductors 6.

  The terminal 5 is closest to the base material layer 11 at the center in the width direction of the surface. The minimum distance between the base material layer 11 and the terminal 5 is, for example, not less than 0.1 mm and not more than 2 mm. The base material layer 11 can be brought close to the surface of the terminal 5 by having the pair of ridges 13.

[Adhesive layer]
The adhesive layer 12 is solidified after the adhesive layer of the multilayer heat recovery article is fluidized. The adhesive layer 12 fulfills functions such as fixing the terminal 5 and the conductor 6, waterproofing, and anticorrosion.

<Connection method>
In the connection structure, for example, a step of electrically connecting a flat terminal and one conductor (electric connection step), and the multilayer heat recovery article is extrapolated to the electrically connected terminal and conductor. A step (extrapolation step) and a step (heating step) of heating the extrapolated multilayer heat recovery article, and the pair of convex portions of the multilayer heat recovery article in the extrapolation step It can be formed by a connection method of facing each other.

(Electrical connection process)
In this step, the flat terminal and one conductor are electrically connected. The method for electrically connecting the terminal and the conductor is not particularly limited. For example, the terminal and the conductor are connected via a method such as heat fusion or ultrasonic fusion, solder, a conductive adhesive, a crimp terminal, or the like. The method of connecting etc. is mentioned.

(Extrapolation process)
In this step, the multilayer heat recovery article is extrapolated to the terminals and conductors that are electrically connected. In this step, the pair of protruding strips of the multilayer heat recovery article are extrapolated so as to face both surfaces of the terminal. In addition, when the said multilayer heat recovery article has a marking in the position corresponding to the convex part of the outer peripheral surface of a base material layer, a convex part can be made to oppose the surface of the said terminal for this marking.

(Heating process)
In this step, the extrapolated multilayer heat recovery article is heated and thermally contracted to coat the terminals and conductors. Examples of the method for heating the multilayer heat recovery article include a method of heating with a heat gun. As said heating temperature, it is 120 to 300 degreeC, for example. The heating time is, for example, 10 seconds or longer and 150 seconds or shorter.

<Advantages>
The connection structure can easily and reliably form a connection structure in which the flat terminal 5 and the conductor 6 are covered with the tube 7, and has excellent adhesion between the tube 7, the terminal 5, and the conductor 6.

[Other Embodiments]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is not limited to the configuration of the embodiment described above, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims. The

  The shape of the base material layer is not particularly limited as long as it is cylindrical, and may be, for example, a rectangular cylinder such as a triangular cylinder or a square cylinder.

  When the multilayer heat recovery article having only one ridge is used in the connection method, the multilayer heat recovery is performed so that the surface of the flat terminal that is not in contact with the conductor faces the ridge. Goods should be extrapolated.

  The cross-sectional shape of the ridge is not limited to an arcuate shape, and may be another shape such as a triangle or a rectangle. Moreover, although the number of the protruding item | line parts which the said base material layer has may be 1 or 3 or more, 1 and 2 are preferable and 2 is more preferable. Moreover, when the said base material layer has several said protruding item | line part, it is good for at least 1 pair of protruding item | line parts to oppose. Furthermore, the said base material layer may have several pairs of protruding item | line parts which oppose. Furthermore, when the said base material layer has the said some protruding item | line part, the height and circumferential direction length of a some protruding item | line part may respectively be same or different.

  The marking is not limited to the colored layer as long as the position of the ridges can be recognized from the outer peripheral surface of the base material layer, and may be, for example, a cut ridge or the like protruding outward. Moreover, since the said marking is arbitrary structures, the said multilayer heat recovery article does not need to have a marking. Further, the marking may be continuous in the axial direction or may be intermittent in the axial direction. Furthermore, when the base material layer has a plurality of ridges, the base material layer may have the markings at positions corresponding to all the ridges, and some of the ridges You may have the said marking in the position corresponding to.

  The total thickness of the base material layer and the adhesive layer may not be substantially constant in the circumferential direction. Thus, even if the total thickness is not substantially constant in the circumferential direction, the space between the base material layer and the object to be coated can be filled by fluidizing the adhesive layer.

  From the viewpoint of reducing the distance between the base material layer and the surface of the flat terminal during coating by enlarging the ridge portion, the multilayer heat recovery article has a height of the ridge portion that is greater than the average thickness of the adhesive layer. And at least part of the ridges may be exposed from the adhesive layer. Also in this case, since the fluidized adhesive layer is filled between the ridge and the object to be coated at the time of coating, the ridge of the connection structure to be formed and the object to be coated can be bonded via the adhesive layer. .

  The cross-sectional shape of the conductor of the connection structure is not limited to a circle, and may be, for example, a rectangle or an ellipse. Further, the number of conductors may be two or more. When the number of conductors of the connection structure is two or more, all of the plurality of conductors may be connected to one surface of the flat terminal, and some of the plurality of conductors are flat plates. The other conductor of the plurality of conductors may be connected to the other surface of the terminal.

  The multilayer heat recovery article according to one embodiment of the present invention can be easily and reliably coated even when the object to be coated includes a flat terminal. The connection structure according to another aspect of the present invention can easily and reliably form a connection structure including a flat terminal, a conductor electrically connected to the terminal, and a tube attached to the terminal and the conductor. And the adhesiveness of the said tube, a terminal, and a conductor is excellent.

DESCRIPTION OF SYMBOLS 1, 11 Base material layer 2, 12 Adhesive layer 3, 13 Projection part 4 Colored layer 5 Terminal 6 Conductor 7 Tube

Claims (5)

A multilayer heat recovery article comprising a cylindrical base material layer and an adhesive layer laminated on the inner peripheral surface of the base material layer,
It said substrate layer, protrudes the adhesive layer side, one or more convex portions continuing in the axial direction and perforated,
Multilayer heat recovery article substantially Ru constant der circumferentially total thickness of the above base layer and the adhesive layer.   The multilayer heat-recovery article according to claim 1, wherein the base material layer is cylindrical and has at least one pair of protruding ridges at opposing positions.   The multilayer heat recovery article according to claim 1 or 2 which has marking in the position corresponding to the convex strip part of the peripheral surface of said base material layer. A connection structure comprising a flat terminal, one or more conductors electrically connected to the terminal, and a tube attached to the terminal and one or more conductors,
The tube is a heat-shrinkable multilayer heat recovery article according to claim 1,
A connection structure in which the ridge is opposed to at least one surface of the terminal. The connection structure according to claim 4 , wherein the multilayer heat recovery article has at least one pair of the protruding portions, and the pair of protruding portions are opposed to both surfaces of the terminal.

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