JP2016201240A - Covering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight covering material having flexibility and capable of satisfactorily maintaining a cylindrical shape before and after the storage of a wire harness or the like.SOLUTION: There is provided a covering material 1 being a cylindrical body obtainable by winding a sheet 2. The covering material 1 has an opening part 3 continuous to the axial direction of the cylindrical body. In the covering material 1, the length in the axial direction of the inner surface thereof and the length in the axial direction of the outer surface are almost the same. Further, in the covering material 1, the length Lin the circumferential direction of the inner surface is shorter than the length Lin the circumferential direction of the outer surface. Thus, in the covering material 1, the shape of its cylindrical body, namely, cylindrical shape can be satisfactorily maintained.SELECTED DRAWING: Figure 2B

Description

  The present invention relates to a coating material obtained by winding a sheet.

  Conventionally, resin corrugated tubes and round tubes have been used as covering materials to focus, route control, and protect against interference with other parts in wire harnesses consisting of multiple wire groups in automobiles, home appliances, heavy electrical appliances, etc. Twist tubes and the like are known. These covering materials are disposed on the outer periphery of the wire bundle for protecting or converging the wires and the like. In order to dispose the covering material after connecting the connector or the like to the wire first, a covering material having an opening continuous in the length direction of the tubular covering material has been developed.

  In the wire harness of a vehicle, suppression of a collision sound is calculated | required at the time of a sound and vibration with weight reduction. In order to meet this requirement, a tubular covering material using a nonwoven fabric has been developed (for example, see Patent Document 1).

JP 2011-74526 A

  In resin-made covering materials having openings that are continuous in the length direction of the tubular covering material, when arranging electric wires, etc., the opening portions of the covering material formed of hard resin are expanded to accommodate the wire harness. There is a need to. For this reason, the manual work of expanding the opening of the hard coating material has a problem of placing a burden on the operator.

  On the other hand, a covering material using a nonwoven fabric has flexibility. For this reason, the burden on the operator is reduced. However, in the covering material using a nonwoven fabric, there is a problem that it is difficult to return to the original tubular state when the opening is expanded and deformed in order to accommodate the wire harness.

  The objective of this invention is providing the coating | covering material which has a softness | flexibility and can maintain a cylindrical shape well before and after accommodating a wire harness etc.

  In order to achieve the above object, a covering material according to one aspect of the present invention has a cylindrical body obtained by winding a flexible sheet, and has a continuous opening in the axial direction of the cylindrical body. The axial length of the inner surface of the cylindrical body and the axial length of the outer surface of the cylindrical body are substantially the same, and the circumferential length of the inner surface of the cylindrical body is Shorter than the circumferential length of the outer surface.

  According to this configuration, since the end portions of the sheet are not bonded to each other in the axial direction of the cylindrical body and have a continuous opening, a covering such as a wire harness can be accommodated from the opening. Can do. Moreover, since the sheet | seat has a softness | flexibility, the operation | work which accommodates a wire harness etc. in a coating | covering material can be made easy.

  Furthermore, since the circumferential length of the inner surface of the cylindrical body is shorter than the circumferential length of the outer surface of the cylindrical body, the covering material that is the cylindrical body has excellent winding properties. As a result, even if the sheet has flexibility, the covering material can maintain the shape of the cylindrical body, that is, the cylindrical shape well. Therefore, in order to accommodate a wire harness or the like in the covering material, even if the opening is widened and the covering material is deformed, the covering material returns to a cylindrical shape after the accommodation. Therefore, the cylindrical shape can be favorably maintained before and after housing the wire harness or the like.

  A covering material according to another aspect of the present invention is a covering material obtained by winding a sheet having flexibility, and has a continuous opening in the axial direction of the cylindrical body, and is difficult. A hot blade is inserted in one direction on one side of a sheet having a flammable thermoplastic resin layer to form a plurality of continuous substantially V-shaped grooves, and then a substantially V-shaped cross section facing each other. By adhering, the axial length of the inner surface of the cylindrical body and the axial length of the outer surface of the cylindrical body are made substantially the same, and the circumferential length of the inner surface of the cylindrical body is It was shorter than the circumferential length of the outer surface of the body.

  The covering material according to still another aspect of the present invention is a covering material obtained by winding a flexible sheet, and has a continuous opening in the axial direction of the tubular body, A hot blade is inserted along one direction on one surface of the sheet having the flame-retardant thermoplastic resin layer to form a plurality of continuous substantially V-shaped grooves, and then the substantially V-shaped facing each other. By bonding the cross sections, the surface area of the inner surface of the cylindrical body was made smaller than the area of the outer surface of the cylindrical body.

  Also with these configurations, the same effects as the above-described configuration can be achieved. Moreover, since the sheet has a flame retardant thermoplastic resin layer, flame resistance can be imparted to the coating material. As a result, the combustion of the coating material and the object to be coated covered with the coating material can be suppressed, and safety can be improved.

  Therefore, the covering material is suitable as a covering material for an automobile wire harness.

  By adjusting at least one of the distance between the grooves, or the depth, groove width, or substantially V-shaped angle of each groove, the diameter of the tubular body and / or the tubular body The shape may be adjusted. The substantially V-shape is not limited to a shape that opens at equal angles on both sides of the virtual surface extending along the groove perpendicular to one surface of the sheet, but the angle of each cross section (groove inner surface) on both sides of the virtual surface. May have different shapes. Further, one cross section of the groove may be along a virtual plane. The angle of each cross section on both sides of the virtual plane is changed in the same manner, the angle of only one cross section on the virtual plane is changed, or the angles of the cross sections on both sides of the virtual plane are different from each other. By changing to V, the angle of the V shape may be adjusted.

  Thereby, the coating | covering material which can accommodate the to-be-coated thing from which the magnitude | size and shape of a to-be-coated object differ can be produced easily.

  Moreover, it is good also as having the overlap | superposition site | part with which the one end edge part and other end edge part of the circumferential direction of a cylindrical body mutually overlap.

  According to this configuration, the object to be coated can be more sufficiently covered (exposure from the opening of the object to be coated can be suppressed). In addition, the thickness of the covering material increases at the overlapping portion. By increasing the thickness, the strength and buffering properties of the coating material are improved. For example, in a portion where the overlapping portion is doubled, the thickness is approximately doubled, and as a result, the strength and buffering property of the covering material are also approximately doubled.

  By adjusting at least one of the depth of the plurality of grooves having a substantially V-shaped cross section, the interval between the grooves, the groove width, or the V-shaped angle of the substantially V-shaped groove, The ratio may be adjusted.

  According to this structure, the coating | covering material which can accommodate the to-be-coated thing from which the magnitude | size and shape of a to-be-coated object differ can be produced easily.

  The covering material preferably includes a foamed thermoplastic resin layer.

  By using a foamed thermoplastic resin layer, it is possible to give excellent processability and buffering properties to the covering material and to provide soundproofing. By using a foamed thermoplastic resin layer, the weight can be further reduced as compared with a covering material using a nonwoven fabric.

  More preferably, the covering material is laminated in the order of a foamed thermoplastic resin layer, a fibrous reinforcing sheet layer made of a thermoplastic resin, and a flame retardant thermoplastic resin layer from the inside of the cylindrical body. It is more preferable that the covering material is formed by using a sheet obtained by laminating a foamed thermoplastic resin layer, a fibrous reinforcing sheet layer made of a thermoplastic resin, and a flame retardant thermoplastic resin layer as a core material.

  By providing the fibrous reinforcing sheet layer made of thermoplastic resin between the foamed flame retardant thermoplastic resin layer and the flame retardant thermoplastic resin layer, the coating material can be given strength. Moreover, the nonwoven fabric which comprises the fibrous reinforcement sheet to be used is few in the whole coating | covering material. Therefore, unlike the configuration in which the entire coating material is made of only a nonwoven fabric, even if a nonwoven fabric powder is generated during the production of the coating material, the amount of the generated powder is very small. There is no risk of ignition. Moreover, a flame-retardant property can be given to a foaming coating material by using a flame-retardant thermoplastic resin layer on the outer surface of a cylindrical body. In addition, by using a thermoplastic resin, it is possible to easily process the surface of the covering material, and to give strength and the like to the surface of the covering material. The fibrous reinforcing sheet layer made of thermoplastic resin may be provided on the surface of the flame retardant thermoplastic resin layer.

  In the covering material, a second flame-retardant thermoplastic resin layer may be further laminated on the foamed thermoplastic resin layer facing the inside of the cylindrical body.

  By providing the second flame-retardant thermoplastic resin layer, water resistance can be imparted to the coating material, and the flame resistance of the coating material can be further improved.

  The covering material according to the present invention has flexibility and can maintain a cylindrical shape well before and after accommodating a wire harness or the like. Therefore, the covering object can be easily accommodated in the covering material (the covering object can be easily covered with the covering material), and the burden on the worker due to the work can be greatly reduced, and the operation cost can be reduced. Can also be greatly reduced.

It is a perspective view of the wire harness coat | covered with the coating | covering material which concerns on one Embodiment of this invention. It is a perspective view which shows notionally the structure of a coating | covering material. It is sectional drawing which shows notionally the structure of a coating | covering material. It is a schematic perspective view which shows an example of the sheet | seat used for a coating | covering material. It is a schematic perspective view which shows another example of the sheet | seat used for a coating | covering material. It is explanatory drawing for demonstrating that the opening part of a coating | covering material has a superimposition site | part. It is sectional drawing of a superimposition site | part. It is sectional drawing for demonstrating the superimposition site | part whose overlay rate is 0%. It is sectional drawing for demonstrating the superimposition site | part whose overlay rate is 100% (coverage rate 200%). It is the schematic which shows the manufacturing apparatus of a coating | covering material. It is a side view explaining the process in a cutting part. It is a top view explaining the process in a cutting part. It is a figure which shows the end surface of the sheet | seat in which the some substantially V-shaped groove | channel was formed. It is a figure explaining an example of a forming part. It is the photograph of the coating | covering material mounted on the sheet | seat which is not wound and the sheet | seat. It is a perspective view for demonstrating after adhesion | attachment observed on the inner surface of a coating | covering material. It is sectional drawing for demonstrating after adhesion | attachment observed on the inner surface of a coating | covering material.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Use state>

  FIG. 1 is a perspective view of a wire harness 10 covered with a covering material 1 according to an embodiment of the present invention.

  The wire harness 10 is used in an automobile to transmit electric power and control signals to electrical components and the like. In order to protect the wire harness 10, the wire harness 10 is covered with the covering material 1.

<Coating material>

  FIG. 2A is a perspective view conceptually showing the structure of the covering material 1. 2B is a cross-sectional view (end view) of the covering material 1 shown in FIG. 2A.

  As shown in FIGS. 2A and 2B, the covering material 1 is a cylindrical body obtained by winding a sheet 2. The covering material 1 has a continuous opening 3 in the axial direction of the cylindrical body.

As shown in FIG. 2A, in the covering material 1, the axial length L _Ain of the inner surface and the axial length L _Aout of the outer surface are substantially the same. Further, as shown in FIG. 2B, in the covering material 1, the circumferential length L _Cin of the inner surface is shorter than the circumferential length L _Cout of the outer surface. For this reason, the coating | covering material 1 can maintain the shape of the cylindrical body, ie, a cylindrical shape favorably.

In addition, the axial length L _Ain of the inner surface of the covering material 1 and the axial length _LAout of the outer surface of the covering material 1 are substantially the same, and the circumferential length L _Cin of the inner surface of the covering material 1. Is shorter than the circumferential length L _Cout of the outer surface of the covering material 1, the surface area of the inner surface of the covering material 1 is smaller than the area of the outer surface of the covering material 1.

  As the sheet 2, a sheet having a thermoplastic resin layer can be used. Thermoplastic resins include polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), ethylene ethyl acrylate copolymer, ethylene propylene copolymer and other polyolefin resins, polyester elastomer, polyurethane elastomer, silicone rubber elastomer, fluoro rubber elastomer Etc. Polyolefin resin is preferable. The thermoplastic resin may be cross-linked. As a crosslinking method, a known method can be used. For example, in addition to a method of crosslinking by irradiating with an electron beam or γ-ray, a method of chemical crosslinking with a peroxide crosslinking agent or the like can be mentioned. Considering processability and cost, electron beam crosslinking is preferable. The thermoplastic resin may be foamed using a known method.

  FIG. 3 is a schematic perspective view showing an example of the sheet 2 used for the covering material 1.

  The sheet 2 preferably has at least a foamed thermoplastic resin layer 11 (foamed thermoplastic resin sheet). More preferably, it is a sheet in which a plurality of thermoplastic resin layers are laminated. It is because the coating | covering material 1 in which the characteristic of the thermoplastic resin of each layer was reflected is obtained by using the sheet | seat 2 which has multiple layers of thermoplastic resin layers.

  In the sheet 2 shown in FIG. 3, the sheet 2 is made of a thermoplastic resin on one surface of the foamed thermoplastic resin layer 11 (foamed thermoplastic resin sheet), which is the outer surface of the covering material 1. A fibrous reinforcing sheet layer (hereinafter sometimes simply referred to as “fibrous reinforcing sheet layer”) 12 and a flame-retardant thermoplastic resin layer 13 (a flame-retardant thermoplastic resin film) are laminated in this order.

  The foamed thermoplastic resin layer 11 (foamed thermoplastic resin sheet) is excellent in heat insulation and flexibility. In addition, a foamed thermoplastic resin is preferable because secondary processing such as cutting is easy. The foamed thermoplastic resin layer 11 may be crosslinkable or non-crosslinkable, and may be selected according to the purpose of use. When a crosslinkable foamable thermoplastic resin is used as the foamable thermoplastic resin layer 11, flame resistance can be imparted to the coating material 1.

  In the sheet 2 used for the covering material 1, by making the foamed thermoplastic resin layer 11 thickest, the weight can be further reduced (for example, about 60% of the weight) than the covering material using the nonwoven fabric. it can. In the thickness of the sheet 2, the thickness of the foamed thermoplastic resin layer 11 may be, for example, about 2 mm to 35 mm, although it depends on the purpose of use and the processed shape.

  The fibrous reinforcing sheet layer 12 can give the coating material 1 high degree of processability and strength. As the nonwoven fabric used for the fibrous reinforcing sheet layer 12, it is preferable to use a nonwoven fabric made of fibers using the above-described thermoplastic resin. Moreover, it is good also as producing a nonwoven fabric with the fiber using a flame-retardant thermoplastic resin. The thickness of the fibrous reinforcing sheet layer 12 may be about 15 μm to 3 mm, for example.

  The flame retardant thermoplastic resin layer 13 (a flame retardant thermoplastic resin film) can impart flame resistance to the covering material 1. The thickness of the flame-retardant thermoplastic resin layer 13 may be, for example, about 10 μm to 150 μm.

  Moreover, when the flame-retardant thermoplastic resin layer 13 is provided in the outermost layer of the coating material, the flame-retardant thermoplastic resin layer 13 may be further surface-treated. The surface of the flame retardant thermoplastic resin layer 13 can give strength to the covering material 1. For the surface processing, a known method may be used, and examples thereof include dry laminating, thermal laminating, adhesive processing, ultrasonic processing, and high-frequency weld processing.

  In addition, when the sheet | seat 2 is a laminated structure, it may not be the above-mentioned 3 layers, and may be 2 layers, and it does not need to be laminated | stacked in order of the above-mentioned 3 layers. For example, the fibrous reinforcing sheet layer 12 may be laminated on the flame retardant thermoplastic resin layer 13. Moreover, when the sheet | seat 2 is a laminated structure, not only the above-mentioned three layers but another layer may be laminated | stacked. The other layer may be a surface on which the fibrous reinforcing sheet layer 12 and the flame retardant thermoplastic resin layer 13 are laminated on the foamed thermoplastic resin layer 11, and the fibrous reinforcing sheet layer 12, The surface in which the flame-retardant thermoplastic resin layer 13 is not laminated | stacked may be sufficient.

  FIG. 4 is a schematic perspective view showing another example of the sheet 2 used for the covering material 1.

  In the sheet 2, as shown in FIG. 4, the second flame-retardant thermoplastic resin layer 14 is formed on the other surface of the foamed thermoplastic resin layer 13 and the inner surface of the covering material 1. Furthermore, it is laminated.

  By providing the second flame-retardant thermoplastic resin layer 14 on the sheet 2, the flame retardance of the coating material 1 can be further improved. Moreover, water resistance can be provided to the covering material 1 by using a water resistant resin for the flame retardant thermoplastic resin of the second flame retardant thermoplastic resin layer 14. Moreover, since it can manufacture at low temperature at the time of manufacture of the coating | covering material 1 by using a thermoplastic resin with a low molding temperature as a 2nd flame retardant thermoplastic resin, it can prevent the coating | covering material 1 being modified | denatured with a heat | fever. . Examples of the thermoplastic resin used for the preferred second flame retardant thermoplastic resin layer 14 include ethylene vinyl acetate copolymer (EVA) and high density polyethylene (HDPE). The thickness of the second flame-retardant thermoplastic resin layer 14 may be about 10 μm to 100 μm, for example.

  Although the thickness of the coating | covering material 1 will not be specifically limited if it has the thickness requested | required in order to protect the to-be-coated object to coat | cover, For example, 1 mm-15 mm, Preferably it should just be 1 mm-10 mm. In addition, when the coating | covering material 1 has a superimposition site | part, the thickness of the coating | covering material 1 can be adjusted with a superposition site | part.

  If the coating | covering material 1 is a cylinder shape, the cross-sectional shape will not be specifically limited, Polygons, such as circular, an ellipse, a triangle, and a rectangle, may be sufficient. In addition, since the coating | covering material 1 is formed with the sheet | seat 2 which has a softness | flexibility, in the state which coat | covers a to-be-coated thing, the cross-sectional shape will follow the external shape of a to-be-coated thing to some extent. Therefore, the cross-sectional shape is not necessarily the same shape as the object to be coated.

  FIG. 5A is an explanatory diagram for explaining that the opening 3 of the covering material 1 has an overlapping portion 3a. FIG. 5B is a cross-sectional view (end view) of the overlapping portion 3a.

  As shown in FIG. 5A, in the covering material 1, the opening 3 may have an overlapping portion 3 a where one end edge and the other end edge in the circumferential direction of the covering material 1 overlap each other. Since the opening 3 has the overlapping portion 3a, the object to be coated can be more sufficiently covered. Further, when the overlapping ratio of the overlapping portion 3a is large, the overlapping portion 3a can be covered closely with an object to be coated that is larger than the inner diameter of the covering material 1. When the opening 3 has the overlapping portion 3a, as shown in FIG. 5B, it is represented by the ratio of the overlapping portion 3a, that is, the ratio of the length L of the overlapping portion 3a to the cross-sectional peripheral length C of the covering material 1. The overlay ratio is not particularly limited, but may be, for example, 0% to 100%.

  FIG. 6A is a cross-sectional view for explaining the overlay ratio 0% (L = 0). FIG. 6B is a cross-sectional view for explaining an overlay ratio of 100%.

  As shown in FIG. 6A, the overlapping rate of 0% means that the end surfaces of the sheet 2 are in contact with each other in a state where the sheet 2 is wound. For example, when the sheet 2 before winding is viewed in the axial direction of the covering material 1, the sheet 2 is formed so that the end face shape is a trapezoid or a parallelogram, and the sheet 2 is wound to overlap the sheet 2. The covering material 1 having a rate of 0% can be manufactured.

  As shown in FIG. 6B, the sheet 2 with a 100% overlap rate means that the sheet 2 is doubled over the entire circumference, and the object to be coated such as the wire harness 10 is doubled ( It can be coated at a coverage of 200%. When the covering material 1 is manufactured using the same sheet 2, the covering material 1 with an overlay rate of 100% is substantially less in strength and cushioning than the covering material 1 with an overlay rate of 0%. Doubled. Further, in the covering material 1, the overlay ratio may exceed 100%.

  When the overlay rate is not 0% (when the sheet 2 has an overlapping portion), the sheet 2 (covering material 1) overlaps in the opening 3 after the covering material 1 is mounted on the object to be coated. The parts may be bonded together using a tape or an adhesive.

  The covering material 1 should just have the internal diameter requested | required of the to-be-coated thing to coat | cover. For example, when covering a wire harness of an automobile, an inner diameter corresponding to an inner diameter standard may be set within a range of 3 mm to 25 mm. The outer diameter of the covering material 1 may be a value close to a value obtained by adding a length twice the thickness that can satisfy the function required as the covering material to the inner diameter.

<Manufacturing method>

  The covering material 1 may be manufactured (produced) by any method as long as it has the above-described configuration. Below, an example of the manufacturing method of the coating | covering material 1 is demonstrated.

  FIG. 7 is a schematic view showing the manufacturing apparatus 20 for the covering material 1.

  The manufacturing apparatus 20 for the covering material 1 includes a supply unit 21, a groove forming unit 22, a forming unit 23, an aging unit 24, and a cut unit 25.

  In the supply unit 21, for example, two rolls 2A and 2B are set in two upper and lower stages. The rolls 2 </ b> A and 2 </ b> B are obtained by winding a long belt-like sheet 2 in a roll shape with the surface serving as the inner surface of the covering material 1 facing inward. One of the raw rolls 2A is in use for the production of the covering material 1, and the sheet 2 drawn from the raw roll 2A has the surface that is the inner surface of the covering material 1 facing upward, and the leading end is supplied The cut portion 25 is reached via the groove forming portion 22, the molding portion 23, and the aging portion 24 beyond the original fabric joint portion 26 provided between the portion 21 and the groove forming portion 22. The other roll material 2B is used next to the roll material 2A. The sheet 2 drawn out from the raw roll 2 </ b> B has a surface to be an inner surface of the covering material 1 facing upward, and a leading end portion of the sheet 2 is disposed at the raw fabric bonding portion 26. And while the roll original fabric 2A is reduced and the rear end portion of the sheet 2 is positioned at the original fabric junction portion 26, the leading end portion of the sheet 2 of the roll original fabric 2B is rolled by the original fabric junction portion 26. It is joined to the rear end of the sheet 2 of the original fabric 2A.

  FIG. 8A is a side view for explaining processing in the groove forming portion 22. FIG. 8B is a plan view for explaining processing in the groove forming portion 22.

  As shown in FIGS. 8A and 8B, the groove forming portion 22 is provided with a plurality of hot blades 25. The plurality of hot blades 25 are provided at right angles or inclined with respect to the upper surface of the sheet 2 at equal intervals in the short direction (direction orthogonal to the longitudinal direction) of the sheet 2. Further, the groove forming part 22 may be provided with heating means such as a heater (not shown).

  FIG. 9 is a diagram illustrating an end surface of the sheet 2 on which a plurality of substantially V-shaped grooves 30 are formed.

  When the sheet 2 is sent in the direction indicated by the arrows in FIG. 8A and FIG. 8B (longitudinal direction of the sheet 2), the plurality of hot blades 25 cut the upper layer portion of the sheet 2 while thermally melting. As a result, a plurality of parallel grooves 30 that are continuous in the feeding direction of the sheet 2 are formed on the upper surface of the sheet 2. As shown in FIG. 9, each groove 30 has a substantially V shape having cross sections 31 a and 31 b corresponding to the shape of the cutting edge of the hot blade 25 and the incident angle with respect to the upper surface of the sheet 2. The substantially V shape may be a shape in which the cross sections 31a and 31b open at equal angles on both sides with respect to a virtual plane orthogonal to the upper surface of the sheet 2 and extending along the groove 30, and is not limited to this shape. The cross sections 30a and 30b on both sides of the virtual plane may have different angles from each other. One of the cross sections 30a and 30b may be along a virtual plane.

  By adjusting at least one of the distance between the plurality of grooves 30 or the depth, groove width, or substantially V-shaped angle of each groove 30, the diameter of the covering material 1, the covering material 1. The shape and / or the ratio of the overlapping portion 3a of the opening 3 can be adjusted. The inter-groove distance of the plurality of grooves 30, or the depth, groove width, or substantially V-shaped angle of each groove 30 can be appropriately selected depending on the intended use and intended purpose of the covering material 1. When the cross-sections 31a and 31b are substantially V-shaped on both sides of the imaginary plane orthogonal to one side of the sheet 2 and extending along the groove 30, the cross-sections 30a and 30b on both sides thereof are substantially V-shaped. Is changed in the same manner, the angle of only one cross section with respect to the virtual plane is changed, or the angles of the respective cross sections on both sides with respect to the virtual plane are changed to be different from each other. The shape of the character may be adjusted. Further, the shapes of the plurality of grooves 30 may be the same, or some or all of them may be different from each other.

  The inter-groove distance varies depending on the thickness of the sheet 2, but may be 2 mm to 15 mm.

  The groove width of the groove 30 may be, for example, a width of 0.1 mm to 99% of the thickness of the sheet 2 for the sheet 2 having a thickness of 1 mm to 10 mm.

  Although the depth of the groove 30 depends on the thickness of the sheet 2, it may be, for example, 0.1 mm to 99% of the thickness of the sheet 2.

  FIG. 10 is a diagram for explaining an example of the forming unit 23.

  In the forming unit 23, the sheet is formed into a cylindrical shape. In the example shown in FIG. 10, the molding part 23 is composed of two guide pipes 41 and 42 having different inner diameters. When the planar sheet 2 passes through the first guide tube 41, the sheet 2 is formed into a substantially cylindrical shape having a relatively large diameter. Next, the sheet 2 formed into a substantially cylindrical shape passes through the second guide tube 42 having an inner diameter smaller than that of the first guide tube 41, so that the sheet 2 is formed into a tube shape corresponding to the covering material 1. The

  The number of guide tubes provided in the molding unit 23 is not limited to two. As long as it has a function of forming a cylinder and a function of determining a cylindrical shape, the number may be one or two or more. It is preferable that the number of guide pipes is two from the viewpoint of having two functions and the simplest configuration.

  The substantially V-shaped groove 30 is formed by cutting the upper layer portion of the sheet 2 with the hot blade 25. For this reason, in the shaping | molding part 23, the cross sections 31a and 31b of the substantially V-shaped groove | channel 30 are in a molten state. As the sheet 2 passes through the molding portion 23, the melted cross sections 31a and 31b are fused, and the sheet 3 has a cylindrical shape. And it is conveyed to the aging part 24, maintaining the cylindrical shape.

In the aging portion 24, the bonding of the cross sections 31a and 31b bonded in the molding portion 23 proceeds. The aging unit 24 may be provided with a cooling device such as a cooler. Thereby, the coating | covering material 1 which has the continuous opening part 3 in the axial direction of the coating | covering material 1 (tubular body), and maintains the same shape stably is obtained. Moreover, since the cross-sections 31a and 31b of each groove 30 formed on the inner surface side are heat-sealed, in the obtained covering material 1, the axial length L _Ain of the inner surface of the covering material 1 and the covering material The axial length L _Aout of the outer surface of 1 is substantially the same, and the circumferential length L _Cin of the inner surface of the coating material 1 is shorter than the circumferential length L _Cout of the outer surface of the coating material 1. Yes. The surface area of the inner surface of the covering material 1 is smaller than the area of the outer surface of the covering material 1.

  The covering material 1 is cut into a predetermined length at the cut portion 25 shown in FIG.

  FIG. 11 is a photograph comparing the covering material 1 manufactured by the above-described method with the unwrapped sheet 2. FIG. 11 is an example in which the flame-retardant thermoplastic resin layer 13 is surface-treated.

  From FIG. 11, it can be seen that the pattern of surface processing of the axial direction of the covering material 1 and the unrolled sheet 2 are the same. If contraction in the axial direction of the inner surface of the covering material 1 occurs, a deviation occurs in the surface processing pattern between the axial direction of the covering material 1 and the unrolled sheet 2. From this, it can be seen that the obtained covering material 1 is not contracted in the axial direction of the inner surface of the covering material 1.

  Adhesion of the cross sections 31a and 31b of the substantially V-shaped groove 30 is not limited to heat fusion. For example, you may adhere | attach using an adhesive agent etc.

  FIG. 12A is a perspective view of the covering material 1, and is a diagram for explaining adhesion marks obtained by bonding the cross-sections 31a and 31b of the opposed substantially V-shaped grooves. FIG. 12B is a cross-sectional view for explaining the adhesion mark.

  As shown in FIG. 12A, a continuous adhesion mark 32 in the longitudinal direction can be observed on the inner surface of the covering material 1 obtained by this method. Further, as shown in FIG. 12B, radial adhesion marks 32 can be observed on the end surface of the covering material 1.

  The covering material 1 is suitable as a covering material for a wire harness of an automobile, but besides being used as a covering material for a wire harness composed of a plurality of electric wire groups in an automobile, a home appliance, a heavy electrical appliance, etc. In the field, it can be effectively used as a covering material for the purpose of focusing, protection, heat insulation, buffering, soundproofing, lightening, insulation, and the like.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Coating | covering material 2 Sheet | seat 3 Opening part 3a Overlapping part 11 Foamed thermoplastic resin layer 12 Fibrous reinforcement sheet layer which consists of thermoplastic resins 13 Flame-retardant thermoplastic resin layer 14 2nd flame-retardant thermoplasticity Resin layer 30 groove

Claims (9)

A cylindrical body obtained by winding a flexible sheet,
Having a continuous opening in the axial direction of the cylindrical body;
The axial length of the inner surface of the cylindrical body and the axial length of the outer surface of the cylindrical body are substantially the same,
The circumferential length of the inner surface of the cylindrical body is shorter than the circumferential length of the outer surface of the cylindrical body,
Coating material. A cylindrical body obtained by winding a flexible sheet is a covering material having a continuous opening in the axial direction of the cylindrical body,
On one surface of the sheet having the flame-retardant thermoplastic resin layer, a hot blade is put in one direction to form a plurality of continuous substantially V-shaped grooves, and then the substantially V-shaped facing each other. The axial length of the inner surface of the cylindrical body and the axial length of the outer surface of the cylindrical body are made substantially the same, and the circumferential surface of the inner surface of the cylindrical body is A covering material whose length is shorter than the circumferential length of the outer surface of the cylindrical body. A cylindrical body obtained by winding a flexible sheet is a covering material having a continuous opening in the axial direction of the cylindrical body,
On one surface of the sheet having the flame-retardant thermoplastic resin layer, a hot blade is put in one direction to form a plurality of continuous substantially V-shaped grooves, and then the substantially V-shaped facing each other. The covering material which made the surface area of the inner surface of the said cylindrical body smaller than the area of the outer surface of the said cylindrical body by adhere | attaching the cross section of.   By adjusting at least one of the distance between the plurality of grooves, the depth of each groove, the groove width, or the angle of the substantially V-shaped V-shape, the diameter of the cylindrical body and / or the The coating | covering material of Claim 2 or 3 by which the shape of a cylindrical body is adjusted.   The said opening part is a coating | covering material in any one of Claim 1 thru | or 3 which has the overlap | superposition site | part with which the one end edge part and the other end edge part of the circumferential direction of the said cylindrical body overlap mutually.   By adjusting at least one of the distance between the plurality of grooves, the depth of each groove, the groove width, or the angle of the substantially V-shaped V-shape, the ratio of the overlapping portions of the openings can be adjusted. The dressing according to claim 5, which is adjusted.   The said sheet | seat is a coating | covering material in any one of Claim 1 thru | or 6 containing a foamable thermoplastic resin layer.   The sheet is laminated from the inside of the cylindrical body in the order of a foamed thermoplastic resin layer, a fibrous reinforcing sheet layer made of a thermoplastic resin, and a flame retardant thermoplastic resin layer. The coating | covering material in any one of.   9. The sheet according to claim 1, wherein a second flame-retardant thermoplastic resin layer is further laminated on the foamed thermoplastic resin layer facing the inside of the cylindrical body. The coating material described.