JP6969332B2 - Cartridge housing and its manufacturing method, and metal tube manufacturing method - Google Patents

Description

The present invention relates to a cartridge housing, a method for manufacturing the same, and a method for manufacturing a metal tube.

Conventionally, a heated tobacco having a cartridge for generating steam and a capsule containing tobacco leaves has been proposed (see, for example, Patent Document 1). In the heat-not-burn tobacco described in Patent Document 1, the tobacco leaves are heated with steam so that steam containing nicotine can be generated.
By the way, as a method for manufacturing a cartridge housing for heat-not-burn tobacco, for example, a method of baking-painting the outer peripheral surface of a metal tube to form a cartridge housing can be considered. However, this method requires a lot of labor for baking finish, which may increase the manufacturing cost.

International Publication No. 2016/159013

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cartridge housing and a method for manufacturing the same, and a method for manufacturing a metal tube, which can reduce the manufacturing cost.

In order to solve the above problems, one aspect of the present invention is (a) a method for manufacturing a cartridge housing used for a heated cigarette in which tobacco leaves are heated by steam, and (b) a heat-shrinkable tube in a metal tube. The first step of covering the metal tube and (c) the metal tube covered with the heat shrink tube are arranged so as to face each other in the longitudinal direction of the metal tube with the first jig and the second jig. The second step of sandwiching in the longitudinal direction and (d) with the metal tube sandwiched, the heat shrink tube is reduced in diameter by heating, and the heat shrink tube is adhered to the outer peripheral surface of the metal tube, and by heating. A third step of extending the heat shrinkable tube in the longitudinal direction of the metal tube, including (e) the facing surface of the first jig to the second jig, and the first of the second jig. Each of the surfaces facing the jig is a flat surface whose outer shape as seen from the longitudinal direction of the metal tube with the metal tube sandwiched in the second step is larger than the end surface of the heat-shrinkable tube. In the step, one end of the stretched heat-shrinkable tube is brought into contact with the surface of the first jig facing the second jig, and the other end of the stretched heat-shrinkable tube is the first of the second jig. The gist is a method for manufacturing a cartridge housing in which the end face of a heat-shrinkable tube and the end face of a metal tube are flush with each other by abutting against a surface facing the jig.

Further, another aspect of the present invention is a cartridge housing used for (a) a heated cigarette that heats tobacco leaves with steam, (b) a metal tube, and (c) a metal tube covered with a metal. The gist is that the cartridge housing is provided with a heat-shrinkable tube attached to the outer peripheral surface of the tube.

Further, in another aspect of the present invention, (a) the first step of covering the metal tube with the heat-shrinkable tube and (b) the metal tube covered with the heat-shrinkable tube face each other in the longitudinal direction of the metal tube. The second step of sandwiching the metal tube in the longitudinal direction with the first jig and the second jig arranged in the above direction, and (c) the heat-shrinkable tube is reduced in diameter by heating while sandwiching the metal tube. A third step of depositing the heat-shrinkable tube on the outer peripheral surface of the metal tube and extending the heat-shrinkable tube in the longitudinal direction of the metal tube by heating is included, and (d) the first jig. Each of the surface facing the second jig and the surface facing the first jig of the second jig is the outer shape seen from the longitudinal direction of the metal tube with the metal tube sandwiched in the second step. Is a plane larger than the end face of the heat shrink tube, and (e) in the third step, one end of the extended heat shrink tube is brought into contact with the facing surface of the first jig to the second jig. A metal tube in which the other end of the extended heat-shrinkable tube is brought into contact with the surface of the second jig facing the first jig so that the end face of the heat-shrinkable tube and the end face of the metal tube are flush with each other. The gist is that it is a manufacturing method.

According to the present invention, unlike the method of forming a cartridge housing by baking and painting a metal tube, for example, it is possible to avoid time-consuming baking and painting. Therefore, it is possible to provide a cartridge housing and a method for manufacturing the same, and a method for manufacturing a metal tube, which can reduce the manufacturing cost.

It is a figure which shows the structure of the heat-not-burn tobacco which concerns on embodiment of this invention, (a) is the side view which shows the assembled state, (b) is the side view which shows the disassembled state. It is sectional drawing which shows the cartridge housing which was broken by the line AA of FIG. It is explanatory drawing for demonstrating the manufacturing method of a cartridge housing. It is a figure for demonstrating the movement of a heat shrink tube at the time of heating, (a) is an explanatory diagram explaining the movement at the early stage of heating, and is an explanatory diagram explaining the movement at a late stage of heating. It is a block diagram which shows the schematic structure of the manufacturing line of a cartridge housing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and modifications such as design changes can be made based on the knowledge of those skilled in the art, and such modifications are added. The form is also included in the scope of the present invention. In addition, each drawing is exaggerated as appropriate to facilitate understanding.

(Heat-not-burn tobacco)
As shown in FIGS. 1 (a) and 1 (b), the heat-not-burn tobacco 1 according to the embodiment of the present invention has a cylindrical battery 2 and an electric power supplied from the battery 2 with one end coupled to one end of the battery 2. It is provided with a cylindrical cartridge 3 for generating electric power, and a cylindrical capsule 4 having one end inserted into the other end of the cartridge 3 and containing tobacco leaves. Then, the tobacco leaves in the capsule 4 are heated by the steam of the cartridge 3 to generate steam containing nicotine.
As shown in FIG. 2, the cartridge 3 includes a cartridge housing 5 that constitutes an outer shell of the cartridge 3. The cartridge housing 5 includes a cylindrical metal tube 6 and a heat-shrinkable tube 7 that is covered with the metal tube 6 and adheres to the outer peripheral surface of the metal tube 6.

(Manufacturing method of cartridge housing)
Next, a method of manufacturing the cartridge housing 5 according to the embodiment of the present invention will be described.
(First step)
First, as shown in FIG. 3A, a columnar first jig 8 having one end face facing upward and the other end face facing downward is prepared. The diameter of the first jig 8 is larger than the diameter of the end face of the heat-shrinkable tube 7 before heat-shrinking. That is, as shown in FIG. 3 (d), the upper surface 8a of the first jig 8, that is, the surface facing the second jig 9 described later, is the metal tube 6 in the second step described later. With the metal tube 6 sandwiched between the jig 8 of 1 and the second jig 9, the outer shape seen from the longitudinal direction of the metal tube 6 is larger than the end face of the heat shrink tube 7 before heat shrinkage. It is a large plane. Further, in the center of the upper surface 8a of the first jig 8, a columnar columnar portion 8b extending in the normal direction of the upper surface 8a, that is, upward is formed. The diameter of the columnar portion 8b is slightly smaller than the inner diameter of the metal tube 6. The columnar portion 8b can be covered with the metal tube 6. The height of the columnar portion 8b is lower than the height of the metal tube 6.

Subsequently, as shown in FIG. 3B, the columnar portion 8b of the first jig 8 is covered with the metal tube 6. As a result, the metal tube 6 is supported from the inside by the columnar portion 8b, and the lower end of the metal tube 6 is set to the first jig 8 so that the metal tube 6 stands on the upper surface 8a of the first jig 8. It is brought into contact with the upper surface 8a of the above.
Subsequently, as shown in FIG. 3C, the metal tube 6 is covered with the heat-shrinkable tube 7 before heat-shrinking. The diameter of the heat shrink tube 7 is larger than the diameter of the metal tube 6. As a result, the heat-shrinkable tube 7 is supported by the metal tube 6, and the heat-shrinkable tube 7 stands on the upper surface 8a of the first jig 8 at the lower end of the heat-shrinkable tube 7. The lower end is brought into contact with the upper surface 8a of the first jig 8. As the material of the heat-shrinkable tube 7, for example, a fluororesin, an ionomer resin, a polyethylene terephthalate resin, and a nylon resin can be adopted. The heat-shrinkable tube 7 has a property of thermally shrinking (reducing the diameter) in the radial direction, that is, in the direction from the outer peripheral surface toward the central axis, and extending in the longitudinal direction, that is, in the direction along the central axis by heating. ing. The length of the heat shrink tube 7 is slightly shorter than the length of the metal tube 6.

(Second step)
Subsequently, as shown in FIG. 3D, a columnar second jig 9 with one end face facing upward and the other end face facing downward is prepared. The diameter of the second jig 9 is the same as the diameter of the first jig 8. That is, the lower surface 9a of the second jig 9, that is, the surface facing the first jig 8, is also formed by connecting the metal tube 6 to the first jig 8 and the second jig 9 in the second step. The outer shape of the metal tube 6 seen from the longitudinal direction in the sandwiched state is a flat surface larger than the end face of the heat-shrinkable tube 7.
Subsequently, as shown in FIG. 3D, above the first jig 8 so that the outer edge of the lower surface 9a of the second jig 9 coincides with the outer edge of the upper surface 8a of the first jig 8. That is, the second jig 9 is arranged so as to face each other in the longitudinal direction of the standing metal tube 6, and the lower surface 9a of the second jig 9 is covered with the heat shrink tube 7. Contact the end face of the upper end. Then, the metal tube 6 is sandwiched between the upper surface 8a of the first jig 8 and the lower surface 9a of the second jig 9 in the longitudinal direction. As a result, the upper end of the heat-shrinkable tube 7 faces the lower surface 9a of the second jig 9 at a distance.

(Third step)
Subsequently, as shown in FIG. 3 (e), the heat-shrinkable tube 7 is heated with the metal tube 6 sandwiched therein. Then, as shown by the arrow in FIG. 4 (a), the heat-shrinkable tube 7 is heat-shrinked (reduced in diameter) in the radial direction of the metal tube 6 by heating, and as shown in FIG. 4 (b), the heat-shrinkable tube 7 is heat-shrinked. The heat-shrinkable tube 7 adheres to the outer peripheral surface of 6. Further, as shown by an arrow in FIG. 4A, the heat-shrinkable tube 7 extends in the longitudinal direction of the metal tube 6 by heating, and as shown in FIG. 4B, the lower end of the heat-shrinkable tube 7 is formed. It abuts on the upper surface 8a of the first jig 8, and the upper end of the heat shrink tube 7 abuts on the lower surface 9a of the second jig 9. When the lower end of the heat-shrinkable tube 7 abuts on the first jig 8 and the upper end abuts on the second jig 9, the extension of the metal tube 6 in the longitudinal direction, which was performed by the heat-shrinkable tube 7, is hindered. The end face of the heat-shrinkable tube 7 and the end face of the metal tube 6 are flush with each other. More specifically, the end face of the upper end of the heat shrink tube 7 and the end face of the upper end of the metal tube 6 are flush with each other, and the end face of the lower end of the heat shrink tube 7 and the end face of the lower end of the metal tube 6 are flush with each other. .. Then, in a state where the end face of the heat-shrinkable tube 7 and the end face of the metal tube 6 are flush with each other, the heat-shrinkable tube 7 is cooled to fix the shape of the heat-shrinkable tube 7. As a method for cooling the heat-shrinkable tube 7, for example, a method can be used in which the heat-shrinkable tube 7 is left in an environment at room temperature after the heating is completed and cooled at room temperature.
Subsequently, as shown in FIG. 3 (f), the second jig 9 that was in contact with the upper end of the metal tube 6 was removed, and the metal tube 6 to which the heat shrink tube 7 was attached was used as the cartridge housing 5. Take it out.

(Cartridge housing production line)
Next, the manufacturing line 10 of the cartridge housing 5 that executes the above-mentioned manufacturing method of the cartridge housing 5 and performs the first step, the second step, and the third step will be described.
As shown in FIG. 5A, the production line 10 of the cartridge housing 5 includes a metal tube feeder 11, a tube feeder 12, a tube mounting machine 13, a shrink machine 14, and a mirror finish inspection machine 15. I have. Then, in the production line 10, each of the plurality of first jigs 8 shown in FIG. 3 (a) has the metal tube feeder 11, the tube mounting machine 13, the shrink machine 14, and the mirror surface shown in FIG. 5 (a). They are conveyed one after another so as to pass through the finish inspection machine 15 in order.

As shown in FIG. 3B, the metal tube feeder 11 covers the columnar portion 8b of the first jig 8 to be conveyed with the metal tube 6 one after another. As a result, the metal tube 6 is supported by the columnar portion 8b, the metal tube 6 is made to stand on the upper surface 8a of the first jig 8, and the lower end of the metal tube 6 is brought into contact with the upper surface 8a of the first jig 8.
As shown in FIG. 5B, the tube feeder 12 cuts a long heat-shrinkable tube 16 wound on a reel (not shown) to form heat-shrinkable tubes 7 one after another, and forms the heat-shrinkable tubes 7. It is inserted into each of the plurality of mandrel 17 and conveyed to the tube mounting machine 13 one after another.
As shown in FIG. 3C, the tube mounting machine 13 has the heat-shrinkable tubes 7 of the tube feeder 12 one after another on the metal tube 6 covered with the columnar portion 8b of the first jig 8 to be conveyed. Cover. As a result, the heat-shrinkable tube 7 is supported by the metal tube 6, the heat-shrinkable tube 7 is made to stand on the upper surface 8a of the first jig 8, and the lower end of the heat-shrinkable tube 7 is placed on the upper surface 8a of the first jig 8. To abut.

In this way, the metal tube feeder 11, the tube feeder 12, and the tube mounting machine 13 execute the first step of the method for manufacturing the cartridge housing 5 described above.
As shown in FIG. 3D, the shrink machine 14 abuts the lower surface 9a of the second jig 9 on the end surface of the upper end of the metal tube 6 covered with the heat-shrinkable tube 7 to be conveyed, and the first jig 9 abuts the lower surface 9a. The metal tube 6 is sandwiched between the upper surface 8a of the jig 8 and the lower surface 9a of the second jig 9. As a result, the lower surface 9a of the second jig 9 and the upper end of the heat-shrinkable tube 7 are in a state of facing each other with a distance. In this way, the shrink machine 14 executes the second step of the method for manufacturing the cartridge housing 5 described above.

Further, the shrink machine 14 heats the heat-shrinkable tube 7 by passing it between the heaters through the first jig 8 and the second jig 9 in a state where the metal tube 6 is sandwiched. As a result, the heat-shrinkable tube 7 is heat-shrinked (reduced in diameter) in the radial direction of the metal tube 6, and the heat-shrinkable tube 7 is adhered to the outer peripheral surface of the metal tube 6. Further, the heat-shrinkable tube 7 extends in the longitudinal direction of the metal tube 6, the lower end of the heat-shrinkable tube 7 abuts on the upper surface 8a of the first jig 8, and the upper end of the heat-shrinkable tube 7 is the second jig 9. The end surface of the heat-shrinkable tube 7 and the end surface of the metal tube 6 are flush with each other. Then, with the end face of the heat-shrinkable tube 7 and the end face of the metal tube 6 flush with each other, the first jig 8 and the second jig 9 with the metal tube 6 sandwiched between them are placed between the heaters. The cartridge housing 5 is formed by cooling the heat-shrinkable tube 7 and fixing the shape of the heat-shrinkable tube 7. In this way, the shrink machine 14 executes the third step of the method for manufacturing the cartridge housing 5 described above.

As shown in FIG. 5C, the mirror finish inspection machine 15 inspects the cartridge housing 5 covered with the columnar portion 8b of the first jig 8 to be conveyed by the image inspection machines 18 and 19 one after another. .. The image inspection machines 18 and 19 determine whether the cartridge housing 5 is a "non-defective product" or a "defective product" based on, for example, the lengths of the upper and lower ends, the state of wrinkles and burrs, and the like. Then, the mirror finish inspection machine 15 places the cartridge housing 5, which is determined to be a “good product”, on the non-defective product conveyor 20. On the other hand, the cartridge housing 5 determined to be "defective" is discharged to the NG product take-out unit.
As described above, in the method for manufacturing the cartridge housing 5 according to the embodiment of the present invention, unlike the method in which the metal tube 6 is baked and painted to form the cartridge housing 5, for example, the time-consuming baking painting is not performed. I'm done. Therefore, it is possible to provide a method for manufacturing the cartridge housing 5 that can reduce the manufacturing cost. Further, since the heat-shrinkable tube 7 is adhered to the outer peripheral surface of the metal tube 6, it is possible to impart functionality such as heat resistance protection, insulation protection, waterproof anticorrosion protection, and surface decoration. Further, since the end face of the metal tube 6 and the end face of the heat-shrinkable tube 7 are flush with each other, the cosmeticity of the end face can be improved.

Further, for example, a method in which the heat-shrinkable tube 7 protrudes from the end of the metal tube 6 and the protruding heat-shrinkable tube 7 is cut by rotating either the metal tube 6 or the cutter requires high rotation accuracy. Therefore, the production line 10 may be complicated. Further, since the metal tube 6 needs to be intermittently fed in the production line 10, the processing speed may be slowed down.
On the other hand, in the method for manufacturing the cartridge housing 5 of the heat-not-burn tobacco 1 according to the embodiment of the present invention, the heat-shrinkable tube 7 is not cut by the cutter, so that the manufacturing line 10 can be simplified and the continuous feed is used. High-speed production is also possible. In addition, there is no maintenance cost for the cutter blade.

Further, for example, in a method in which the heat-shrinkable tube 7 protrudes from the end of the metal tube 6 and the heat-shrinkable tube 7 protrudes by polishing with a polishing tape, the path of the production line 10 may become longer depending on the polishing time. There is. In addition, burrs may occur due to polishing.
On the other hand, in the method for manufacturing the cartridge housing 5 of the heat-not-burn tobacco 1 according to the embodiment of the present invention, since the heat-shrinkable tube 7 is not polished with the polishing tape, the path of the manufacturing line 10 can be shortened and the polishing can be performed. Burr does not occur. In addition, there is no maintenance cost for the polishing tape.
Further, in the method for manufacturing the cartridge housing 5 according to the embodiment of the present invention, in the first step, the columnar portion 8b is covered with the metal tube 6, and the lower end of the metal tube 6 is placed on the upper surface 8a of the first jig 8. The metal tube 6 was covered with the heat-shrinkable tube 7 so that the lower end of the heat-shrinkable tube 7 was brought into contact with the upper surface 8a of the first jig 8. Therefore, the work of sandwiching the metal tube 6 covered with the heat-shrinkable tube 7 between the first jig 8 and the second jig 9 can be easily performed.

Further, in the method for manufacturing the cartridge housing 5 of the heat-not-burn tobacco 1 according to the embodiment of the present invention, in the third step, the end face of the heat-shrinkable tube 7 and the end face of the metal tube 6 are flush with each other. , The heat-shrinkable tube 7 was cooled so that the shape of the heat-shrinkable tube 7 was fixed. Therefore, the flushness between the end face of the heat-shrinkable tube 7 and the end face of the metal tube 6 can be more reliably maintained.
Further, in the cartridge housing 5 of the heat-not-burn tobacco 1 according to the embodiment of the present invention, the metal tube 6 and the heat-shrinkable tube 7 covered with the metal tube 6 and adhered to the outer peripheral surface of the metal tube 6 are provided. Since it is provided, it is possible to impart functionality such as heat resistance protection, insulation protection, waterproof anticorrosion protection, and surface decoration.

(Modification example)
(1) Although the above embodiment shows an example of a heat-not-burn tobacco 1 in which a capsule 4 containing tobacco leaves is inserted into one end of a cartridge 3, other configurations can be adopted. For example, the cartridge 3 may contain tobacco leaves in advance.
(2) Further, in the above embodiment, an example of a method for manufacturing the cartridge housing 5 of the heat-not-burn tobacco 1 is shown, but the application destination of this manufacturing method is not limited to the manufacturing of the cartridge housing 5. It can be applied to the manufacture of a metal tube 6 to which a heat shrink tube 7 is adhered. That is, the above manufacturing method can also be used as a manufacturing method of the metal tube 6 to which the heat-shrinkable tube 7 is adhered.

(3) Further, in the above embodiment, in the first step and the second step, an example is shown in which the columnar portion 8b is covered with the metal tube 6 and then the metal tube 6 is covered with the heat-shrinkable tube 7. It is also possible to adopt the procedure of. For example, the metal tube 6 may be covered with the heat-shrinkable tube 7, and then the metal tube 6 covered with the heat-shrinkable tube 7 may be covered with the columnar portion 8b. Further, for example, after covering the columnar portion 8b with the heat-shrinkable tube 7, the metal tube 6 may be inserted between the columnar portion 8b and the heat-shrinkable tube 7.
(4) Further, in the above embodiment, an example of cooling the heat-shrinkable tube 7 in a state where the end face of the heat-shrinkable tube 7 and the end face of the metal tube 6 are flush with each other is shown, but another procedure is adopted. You can also do it. For example, cooling of the heat shrink tubing 7 may be omitted. In this case, since the heat-shrinkable tube 7 is adhered to the outer peripheral surface of the metal tube 6 due to heat shrinkage, the frictional force between the heat-shrinkable tube 7 and the metal tube 6 causes the end face of the heat-shrinkable tube 7 and the metal tube 6 to be in contact with each other. The state where the end face is flush with the end face is maintained.

(5) Further, in the above embodiment, an example in which each of the first jig 8 and the second jig 9 is cylindrical is shown, but other configurations can also be adopted. The first jig 8 and the second jig 8 and the second jig 8 have a facing surface that abuts on the upper end and the lower end of the heat-shrinkable tube 7 that extends during heating, and can limit the extension of the heat-shrinkable tube 7 in the longitudinal direction. The jig 9 may have another shape.
(6) Further, in the above embodiment, an example in which the metal tube 6 has a cylindrical shape is shown, but other configurations can also be adopted. If it is tubular, it may have other shapes such as a triangular tube and a square tube.

1 ... heated cigarette, 2 ... battery, 3 ... cartridge, 4 ... capsule, 5 ... cartridge housing, 6 ... metal tube, 7 ... heat shrink tube, 8 ... first jig, 8a ... top surface (opposing surface) , 8b ... Columnar part, 9 ... Second jig, 9a ... Bottom surface (opposing surface), 10 ... Production line, 11 ... Metal tube feeder, 12 ... Tube feeder, 13 ... Tube mounting machine, 14 ... Shrink machine , 15 ... Mirror finish inspection machine, 16 ... Long heat shrink tube, 17 ... Mandrel, 18, 19 ... Image inspection machine, 20 ... Good product conveyor

Claims (5)

It is a method of manufacturing a cartridge housing used for heat-not-burn tobacco that heats tobacco leaves with steam.
The first step of covering the metal tube with the heat shrink tube,
A second jig in which the metal tube covered with the heat-shrinkable tube is sandwiched in the longitudinal direction of the metal tube by a first jig and a second jig arranged so as to face each other in the longitudinal direction of the metal tube. Steps and
With the metal tube sandwiched, the heat-shrinkable tube is reduced in diameter by heating, the heat-shrinkable tube is adhered to the outer peripheral surface of the metal tube, and the heat-shrinkable tube is attached to the longitudinal surface of the metal tube by heating. Including a third step of extending in the direction,
The surface of the first jig facing the second jig and the surface of the second jig facing the first jig each have the metal tube in the second step. The outer shape seen from the longitudinal direction of the metal tube in the sandwiched state is a flat surface larger than the end face of the heat-shrinkable tube.
In the third step, one end of the stretched heat-shrinkable tube is brought into contact with the surface of the first jig facing the second jig, and the other end of the stretched heat-shrinkable tube is the first. A method for manufacturing a cartridge housing, characterized in that the end surface of the heat-shrinkable tube and the end surface of the metal tube are flush with each other by abutting the second jig on the surface facing the first jig. .. A columnar portion is formed on the surface of the first jig facing the second jig.
In the first step, the columnar portion is covered with the metal tube, and one end of the metal tube is brought into contact with the facing surface of the first jig to the second jig, and then the metal. The cartridge casing according to claim 1, wherein the tube is covered with the heat-shrinkable tube, and one end of the heat-shrinkable tube is brought into contact with the surface of the first jig facing the second jig. How to make a body. The third step is characterized in that the heat-shrinkable tube is cooled so that the shape of the heat-shrinkable tube is fixed in a state where the end face of the heat-shrinkable tube and the end face of the metal tube are flush with each other. The method for manufacturing a cartridge housing according to claim 1 or 2. A cartridge housing used for heated tobacco that heats tobacco leaves with steam.
A cartridge housing comprising a metal tube and a heat-shrinkable tube covered with the metal tube and adhered to an outer peripheral surface of the metal tube. The first step of covering the metal tube with the heat shrink tube,
A second jig in which the metal tube covered with the heat-shrinkable tube is sandwiched in the longitudinal direction of the metal tube by a first jig and a second jig arranged so as to face each other in the longitudinal direction of the metal tube. Steps and
With the metal tube sandwiched, the heat-shrinkable tube is reduced in diameter by heating, the heat-shrinkable tube is adhered to the outer peripheral surface of the metal tube, and the heat-shrinkable tube is attached to the longitudinal surface of the metal tube by heating. Including a third step of extending in the direction,
The surface of the first jig facing the second jig and the surface of the second jig facing the first jig each have the metal tube in the second step. The outer shape seen from the longitudinal direction of the metal tube in the sandwiched state is a flat surface larger than the end face of the heat-shrinkable tube.
In the third step, one end of the stretched heat-shrinkable tube is brought into contact with the surface of the first jig facing the second jig, and the other end of the stretched heat-shrinkable tube is the first. A method for manufacturing a metal tube, characterized in that the end surface of the heat-shrinkable tube and the end surface of the metal tube are flush with each other by abutting the second jig on the surface facing the first jig.

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