WO2019216441A1

WO2019216441A1 - Method for manufacturing handrail and handrail manufacturing device

Info

Publication number: WO2019216441A1
Application number: PCT/JP2019/019003
Authority: WO
Inventors: 行世小山; 健一森本
Original assignee: 株式会社エス・バイ・ケイ
Priority date: 2018-05-11
Filing date: 2019-05-13
Publication date: 2019-11-14
Also published as: JPWO2019216441A1; JP6652686B1

Abstract

[Problem] To provide a method for manufacturing a handrail in which it is possible to form an arbitrary pattern/unevenness on the handrail surface. [Solution] A method for manufacturing a handrail according to the present invention includes: a step (S200) for forming a foam resin layer 20 including a foaming agent (21) on the surface 10a of a pipe member 10; a step for disposing the pipe member 1) on which the foam resin layer 20 is formed in a mold 200; and a step (S350) for forming an uneven pattern section 60 on the foam resin layer 20. The mold 200 comprises a cavity 38 corresponding to the uneven pattern section 60 formed on the surface 20a of the foam resin layer 20. A suction hole 39 that suctions air inside the cavity is formed in the cavity 38. During the step (S350) for forming the uneven pattern section 60, the foam resin layer 20 is heated while negative pressure is created inside the cavity 38.

Description

Handrail manufacturing method and handrail manufacturing apparatus

The present invention relates to a handrail manufacturing method and a handrail manufacturing apparatus. In particular, the present invention relates to a handrail manufacturing method and a handrail manufacturing apparatus capable of forming irregularities and patterns on the surface of the handrail.
This application claims priority based on Japanese Patent Application No. 2018-092146 filed on May 11, 2018, the entire contents of which are incorporated herein by reference. ing.

With the progress of an aging society in recent years, the necessity of installing handrails on stairs, toilets, toilets, corridors, entrances, entrance doors tends to increase in general housing (Patent Documents 1, 2, etc.) ). In particular, the handrail installed along the stairs needs to support the weight of a person when going up and down the stairs, and is required to have sufficient strength characteristics to withstand the load at that time.

Conventionally, as a handrail bar material, natural wood, laminated wood, woody material such as medium density fiberboard, metal such as aluminum and stainless steel, or resin is used. For handrail bars for indoor use, a wood material having a good touch and a relatively high strength is generally preferred.

However, it is pointed out that a handrail bar formed from a wood material is manufactured by cutting out from natural wood or laminated timber, resulting in a high manufacturing cost. In addition, wooden handrail bars are inferior in workability and the like as compared with handrail bars formed of metal that is easy to bend because it is difficult to create a complicated curved shape in a corner portion or the like.

On the other hand, touching the metal material that forms building materials and equipment for general housing with bare hands may cause coldness and uncomfortable feeling. For this reason, it is preferable that it is a member which makes it hard to feel cold at the time of contact in the part which a human body contacts at least.

JP 2015-25343 A Japanese Patent Laid-Open No. 10-266514

Patent Document 1 proposes a handrail bar that not only has a warm touch like natural wood when touched, but also has rigidity enough to withstand use. Specifically, a handrail bar is disclosed in which a foamed resin layer having a predetermined thickness, foaming ratio, and thermal conductivity is formed on the surface of a metal handrail bar body.

Patent Document 2 proposes a handrail that prevents coldness, static electricity, and slipping without attaching a cover. Specifically, a handrail made of a fiber-reinforced plastic pipe in which steps of 10 μm to 700 μm are formed at intervals of 1 to 50 mm in the longitudinal direction of the pipe surface is disclosed.

With the handrails according to the techniques of Patent Documents 1 and 2, it is possible to make a fine step (for example, a step having a height of 700 μm or less), but it is difficult to form an arbitrary pattern / unevenness. . To further explain, in the handrail in which the foamed resin layer is formed around the metal pipe, the inventor of the present application could not form the pattern / uneven shape as designed on the surface of the handrail. It was only a rough surface like 2 (or a wavy uneven surface with a low height). Under such circumstances, the inventor of the present application has intensively studied and found out a technique capable of forming an arbitrary pattern / unevenness on the handrail surface with a slight trigger, and has come up with the present invention.

The present invention has been made in view of the above points, and its main object is to provide a method for manufacturing a handrail capable of forming an arbitrary pattern / unevenness on the surface of the handrail.

The handrail manufacturing method according to the present invention includes a step of forming a foamed resin layer containing a foaming agent on the surface of a pipe member, and a step of placing the pipe member on which the foamed resin layer is formed in a mold. And forming a concavo-convex pattern portion on the foamed resin layer. The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer. The cavity is formed with a suction hole for sucking air in the cavity. In the step of forming the concavo-convex pattern portion, the foamed resin layer is heated while making the inside of the cavity have a negative pressure.

In a preferred embodiment, in the step of forming the foamed resin layer, the foamed resin layer contains an unfoamed foaming agent. When the foamed resin layer is heated, the unfoamed foaming agent is foamed.

In a preferred embodiment, the pipe member is a metal circular pipe. The step of forming the foamed resin layer is performed by extruding a resin material containing the foaming agent on the pipe member. In the step of forming the foamed resin layer, a coating layer is formed on the outer layer of the foamed resin layer. The uneven pattern portion is formed by changing the height of the surface of the coating layer.

In a preferred embodiment, the mold is a metal mold provided with a heater. The mold has a separable structure. The mold is formed with a central opening for accommodating the pipe member on which the foamed resin layer is formed. The cavity is formed on a surface where the central opening is located. A suction pipe that communicates with the suction hole is connected to the mold. The heating of the foamed resin layer is performed by the heater.

In another handrail manufacturing method according to the present invention, a foamed resin layer containing a foaming agent is formed on a surface of a pipe member, and the pipe member on which the foamed resin layer is formed is disposed in a mold. A step, a step of disposing the mold in which the pipe member is disposed in a chamber, and a step of forming an uneven pattern portion in the foamed resin layer. The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer. By making the inside of the chamber negative, the foamed resin layer is heated while the inside of the mold is made negative.

In a preferred embodiment, in the step of forming the foamed resin layer, the foamed resin layer contains an unfoamed foaming agent. When the foamed resin layer is heated, the foaming agent in the unfoamed state is foamed, and the foamed resin layer is heated by heating the inside of the chamber.

In a preferred embodiment, the cavity in the mold is formed with a suction hole for sucking air in the cavity.

The manufacturing apparatus which concerns on this invention is a manufacturing apparatus which manufactures a handrail, the resin layer forming apparatus which forms the foamed resin layer containing a foaming agent on the surface of a pipe member, and the said pipe in which the said foamed resin layer was formed And a mold in which members are arranged. The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer. The cavity is formed with a suction hole for sucking air in the cavity.

In a preferred embodiment, the mold is a metal mold provided with a heater. The mold has a separable structure. The mold is formed with a central opening for accommodating the pipe member on which the foamed resin layer is formed. The cavity is formed on a surface where the central opening is located.

In a preferred embodiment, the resin layer forming apparatus is an extrusion molding apparatus having a head portion through which the pipe member passes. The extrusion molding apparatus is an apparatus in which a foamed resin layer containing a foaming agent and a coating layer located on the outer surface of the foamed resin layer are stacked on the outer surface of the pipe member. A suction pipe that communicates with the suction hole is connected to the mold.

The manufacturing method according to the present invention is a manufacturing method of a pipe structure having a foamed resin layer, the step of forming a foamed resin layer containing a foaming agent on the surface of a pipe member, and the foamed resin layer formed thereon It includes a step of placing the pipe member in a mold and a step of forming an uneven pattern portion in the foamed resin layer. The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer.

In a preferred embodiment, the cavity is formed with a suction hole for sucking air in the cavity. In the step of forming the concavo-convex pattern portion, the foamed resin layer is heated while making the inside of the cavity have a negative pressure. In the step of forming the foamed resin layer, the foamed resin layer contains an unfoamed foaming agent. When the foamed resin layer is heated, the unfoamed foaming agent is foamed.

The handrail according to the present invention includes a foamed resin layer containing a foaming agent, and a concavo-convex pattern portion formed on the foamed resin layer, and a side surface defining the concavo-convex pattern portion extends substantially vertically and is 1 mm or more. Has a height of

In a preferred embodiment, the concavo-convex pattern portion is at least one selected from the group consisting of a convex portion of a geometric pattern, a convex portion of a character, and a convex portion of a fiber shape. The substantially vertical is an angle within a range of 80 ° to 90 °. The height of the side surface that defines the uneven pattern portion is 10 mm or less.

In a preferred embodiment, a coating layer is formed on the outer layer of the foamed resin layer, and the concavo-convex pattern portion is formed by changing the height of the surface of the coating layer.

In a preferred embodiment, the uneven pattern portion is formed by sucking the foamed resin layer while heating.

In the present invention, after forming a foamed resin layer on the surface of the pipe member, the pipe member is placed in a mold, and then an uneven pattern portion is formed in the foamed resin layer. The mold includes a cavity corresponding to the uneven pattern portion, and a suction hole is formed in the cavity. Then, in the step of forming the concavo-convex pattern portion, the foamed resin layer is heated while making the inside of the cavity have a negative pressure. According to the present invention, when forming a concavo-convex pattern portion on a foamed resin layer using a mold provided with a cavity corresponding to the concavo-convex pattern portion, the foamed resin layer is heated while maintaining a negative pressure in the cavity. The expanded foamed resin layer can be brought into firm contact with the surface of the cavity. As a result, since the uneven pattern portion can be stably and stably formed on the foamed resin layer, it is possible to form an arbitrary pattern / unevenness on the surface of the handrail.

It is sectional drawing which shows typically the cross-section of the handrail 100 which concerns on embodiment of this invention. 3 is a perspective view showing a configuration of a pipe member 90. FIG. It is a perspective view which shows an example of a structure of the handrail 100 which concerns on embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the handrail 100 which concerns on embodiment of this invention. It is a perspective view which shows the structure of the metal mold | die 200 which concerns on embodiment of this invention. It is a perspective view which shows the structure of the metal mold | die 200 which concerns on embodiment of this invention. It is an enlarged view which shows the structure of the metal mold | die 200 which concerns on embodiment of this invention. 3 is an enlarged view showing a cavity 38 of a mold 200. FIG. It is a perspective view which shows the structure of the metal mold | die 200 which concerns on embodiment of this invention. It is a perspective view which shows an example of a structure of the handrail 100 which concerns on embodiment of this invention. FIG. 6 is an enlarged view showing an uneven pattern portion 60 of a handrail 100. It is a perspective view which shows the structure of the extrusion molding apparatus 300 which concerns on embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the handrail 100 which concerns on embodiment of this invention. It is a figure which shows the handrail 100 (Example) which concerns on embodiment of this invention. It is a figure which shows the handrail 100 (Example) which concerns on embodiment of this invention. It is a figure which shows the handrail 100 (Example) which concerns on embodiment of this invention. It is a figure which shows the handrail 100 (Example) which concerns on embodiment of this invention. It is a figure which shows the handrail 100 (Example) which concerns on embodiment of this invention. It is a figure which shows the handrail 100 (Example) which concerns on embodiment of this invention.

The inventor of the present application has a problem that the handrail bar made of a wooden material has a good touch but has a problem that the manufacturing cost is high, whereas the handrail bar made of a metal material has a problem of feeling cold and uncomfortable. I was trying to solve the problem. When a foamed resin layer containing a foaming agent is formed on the surface of a handrail bar made of a metal material, coldness can be reduced by bubbles formed by the foaming agent. However, even if an attempt was made to form an uneven pattern on the foamed resin layer, a clean product could not be obtained. Even if the type and composition of the foaming agent and resin were changed or the conditions such as temperature were changed, the uneven pattern could not be cleaned. Under such circumstances, the idea of making the cavity of the mold for forming the uneven pattern negative pressure comes up, leaving the unfoamed component in the foamed resin layer containing the foaming agent, the unfoamed component The present invention succeeded in forming an uneven pattern on the foamed resin layer by sucking the inside of the cavity with a negative pressure while heating, resulting in the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following drawings, for simplification of description, members and parts having the same action are denoted by the same reference numerals, and redundant description may be omitted or simplified. In addition, the dimensional relationship (length, width, thickness, etc.) in each drawing may not necessarily accurately reflect the actual dimensional relationship. Further, matters necessary for the implementation of the present invention other than matters specifically mentioned in the present specification can be grasped as design matters of those skilled in the art based on the prior art in this field. The present invention can be carried out based on the contents disclosed in the present specification and drawings and the common general technical knowledge in the field. In addition, the present invention is not limited to the following embodiments.

FIG. 1 shows a cross-sectional configuration of a handrail 100 according to an embodiment of the present invention. FIG. 2 shows the configuration of the pipe member 10 located at the center of the handrail 100 of the present embodiment. FIG. 3 is a perspective view showing the configuration of the handrail 100 according to the embodiment of the present invention.

The pipe member 10 of the present embodiment is a circular tube 90 made of metal (for example, aluminum, iron, copper, stainless steel, etc.). Specifically, the metal circular pipe 90 (pipe member 10) is an aluminum circular pipe. The pipe member 10 has an opening 15 at the center. The end surface of the pipe member 10 has a circular tube shape. Note that the pipe member 10 is not limited to one made of a metal material, but may be other materials (for example, resin, ceramic, etc.). In addition, the pipe member 10 is not limited to the shape of a circular tube, but may have other shapes (for example, an ellipse, an ellipse (track shape), a triangle, a quadrangle, a hexagon, and a rotating body (regular triangle, square, regular pentagon, It may be a regular hexagon, a regular octagon, or an irregular shape.

The foamed resin layer 20 is formed on the surface 10 a of the pipe member 10. The foamed resin layer 20 of the present embodiment is made of a resin material containing a foaming agent (21). The foaming agent (21) is added to a material (in this case, a resin material) and generates gas in the process of commercialization to generate bubbles in the product. The foaming agent (21) of this embodiment is used for resin molding. By using the foaming agent (21), a foamable resin can be molded to produce a porous resin. The foaming agent (21) of the present embodiment is a substance that supplies a gas for forming bubbles in foam molding, and is roughly divided into a chemical foaming agent and a physical foaming agent (or foamable microcapsules). . In addition, although the foaming agent of an expandable microcapsule is a physical foaming agent, handling is similar to a chemical foaming agent.

A suitable example of the foaming agent (21) of the present embodiment is a pyrolytic foaming agent (particularly a pyrolytic chemical foaming agent). The foaming agent (21) has a property of foaming by heat during molding, starts to foam at a predetermined temperature, and the foaming ratio increases to some extent as the temperature rises. Chemical foaming agents are classified into organic foaming agents and inorganic foaming agents. Examples of the organic pyrolytic foaming agent include ADCA (azodicarbonamide), DPT (N, N′-dinitrosopentamethylenetetramine), OBSH (4,4′-oxybisbenzenesulfonylhydrazide) and the like. be able to. Examples of the inorganic pyrolytic foaming agent include bicarbonate (for example, sodium bicarbonate (sodium bicarbonate)), carbonate, a combination of bicarbonate and organic acid salt, and the like. Determining the performance of a pyrolytic chemical foaming agent is the decomposition temperature, the amount of gas generated, and the particle size, and matching between the decomposition temperature and the molding temperature is also important. It is desirable to select a suitable foaming agent (21). A blend of a plurality of types of foaming agents can also be used.

The resin material (base material) constituting the foamed resin layer 20 of the present embodiment is, for example, PVC (polyvinyl chloride), TPE (thermoplastic elastomer), PVAc (polyvinyl acetate), etc., but is not limited thereto. Instead, a suitable material is selected according to the characteristics of the foamed resin layer 20. In addition, a resin material (base material) obtained by blending a plurality of resin materials may be used. The amount of foaming agent (21) added to the resin material (base material) is, for example, 5% or less (mass%), for example, about 1% to 3% (mass%). In addition, the addition amount of a foaming agent (21) is not necessarily limited to such an amount, A suitable thing can be selected suitably according to various conditions.

In the configuration of the present embodiment, the foamed resin layer 20 is formed by extruding a resin material containing a foaming agent (21). Moreover, in the structure of this embodiment, when forming the foamed resin layer 20, the foamed resin layer 20 contains the foaming agent (21) of an unfoamed state. And when the foamed resin layer 20 is heated (at the time of resin molding heating), the unfoamed foaming agent (21) foams, whereby the concavo-convex pattern portion 60 is formed in the foamed resin layer 20. The concavo-convex pattern portion 60 is a concavo-convex shape formed on the surface of the foamed resin layer 20, or a pattern formed by changing (different) the height of the surface (for example, a geometric pattern, a character figure, Animal / plant graphic, arbitrary graphic / pattern (for example, handwritten graphic, randomly changing graphic). In the example shown in FIG. 3, as the concavo-convex pattern portion 60, a concavo-convex pattern (figure) having an elongated deformed elliptical shape (slightly slender figure) is formed on the foamed resin layer 20. In the handrail 100 of this embodiment, the coating layer 25 is formed on the outer layer of the foamed resin layer 20, and the uneven pattern portion 60 is formed on the coating layer 25. The coating layer 25 is a protective layer (resin layer) that protects the foamed resin layer 20. In the coating layer 25 of this embodiment, the antibacterial, antifungal, chemical resistance, weather resistance, abrasion resistance, antifouling property, fire resistance, grain pattern, etc. (at least one of them) are provided. can do. The coating layer 25 of the present embodiment is composed of, for example, an auxiliary compounding (for example, compounding a component that imparts characteristics such as an antibacterial agent) to a base material such as PVC, TPE, ABS, or PE. . In the case where the foamed resin layer 20 does not need to be protected, the coating layer 25 may not be provided. However, in consideration of the characteristics and application of the handrail 100, it is preferable to provide the coating layer 25.

When the thickness of the handrail 100 of this embodiment is exemplarily shown, the thickness of the pipe member 10 is 100 units (here, 2 mm), and the thickness of the foamed resin layer 20 is 50 to 200 units (here, The thickness of the coating layer 25 is 100 units or less (here, 50 units or less, that is, 1 mm or less (or 0.5 mm or less)). The thickness (or diameter) of each layer (10, 20, 25) varies depending on the required handrail 100, and a specific suitable thickness (or diameter) is appropriately adopted. can do.

In the configuration example shown in FIG. 3, the uneven pattern portion 60 is formed on the surface of the handrail 100 of the present embodiment (here, the surface 25 a of the coating layer 25). The illustrated concavo-convex pattern portion 60 includes a convex portion 61 (a geometrical figure or an arbitrary pattern) and a concave portion 62 positioned between the convex portions 61. In the illustrated configuration example, the concave portion 62 is the same as a region (non-formed region) 69 where the concave and convex portion 60 is not formed. However, the recess 62 may be formed to be lower than the non-formation region 69. The convex portion 61 of the present embodiment includes a pattern portion (pattern surface) 61 a that defines a pattern or a figure, and a connection portion (connection surface or inclined surface) 61 b that connects the pattern portion 61 and the non-formation region 69. It is configured. In addition, when the coating layer 25 is not formed, the uneven | corrugated pattern part 60 will be formed in the surface (20a) of the foamed resin layer 20. FIG. Further, a further outer layer (for example, a transparent clear layer or a coloring layer (including a translucent color layer, a metal color layer, etc.)) may be formed outside the coating layer 25.

In the configuration of the present embodiment, a plurality of uneven pattern portions 60 are formed on the handrail 100. In the illustrated example, a plurality of concave / convex patterns 60 are formed in a line, but the concave / convex patterns 60 may be formed in other forms. For example, the concavo-convex pattern portions 60 may be connected to form a single convex portion 61, or the concavo-convex pattern portions 60 may be arranged in a zigzag pattern instead of in a single row. In the embodiment shown in FIG. 3, the concavo-convex pattern portion 60 is formed on the upper side in the drawing, but the concavo-convex pattern portion 60 may be formed on the lower side (both up and down) in addition to the upper side. Or you may form the uneven | corrugated pattern part 60 in the horizontal side (right side and / or left side) in drawing. The height of the convex portion 61 in the concavo-convex pattern portion 60 is, for example, not less than 0.1 mm and not more than 1.5 mm (or 1.0 mm to 5 mm) with reference to the surface of the non-formation region 69. It is not limited, and a suitable one can be appropriately determined in consideration of various conditions (manufacturing conditions, use conditions, cost conditions, etc.) required for the handrail 100.

In addition, although the illustrated handrail 100 shows the thing on a straight line (pipe member on a straight line) for description, the thing bent by processing (for example, bent to 90 degrees, or a predetermined angle) (Bent to 60 °).

Next, the manufacturing method of the handrail 100 of this embodiment is demonstrated, referring FIG. FIG. 4 is a flowchart for explaining a method of manufacturing the handrail 100 of this embodiment.

In the manufacturing method of the handrail 100 of this embodiment, after preparing the pipe member 10, the foamed resin layer 20 containing the foaming agent (21) is formed on the surface 10a of the pipe member 10. Next, the pipe member 10 (handrail pipe) on which the foamed resin layer 20 is formed is placed in a mold. Subsequently, the uneven pattern portion 60 is formed in the foamed resin layer 20. The details will be described below.

As shown in FIG. 4, first, the pipe member 10 is prepared (step S100). Although the pipe member 10 of this embodiment is an aluminum pipe, other pipe members (for example, a stainless pipe, a resin pipe, etc.) may be sufficient.

Next, the foamed resin layer 20 is formed on the surface 10a of the pipe member (aluminum pipe) 10 (step S200). Specifically, the foamed resin layer 20 is formed by applying a resin material containing a foaming agent (21) to the surface 10a of the pipe member 10. In the present embodiment, the foaming agent (21) is, for example, an inorganic foaming agent (trade name: Cell Microphone), a microcapsule (trade name: Expandance), or the like. A plurality of types of foaming agents (21) can be blended and used. The resin material used as a base material is PVC, TPE, PVAc, etc., for example. A plurality of types of resin materials can be blended and used. The amount of the foaming agent (21) added is, for example, 1 to 3% (mass%).

In the present embodiment, the foamed resin layer 20 and the coating layer 25 are laminated on the surface 10a of the pipe member 10 by an extrusion method using a crosshead extruder. Specifically, a laminated film of the foamed resin layer 20 and the coating layer 25 is formed on the surface 10a of the pipe member 10 at a time by passing the pipe member 10 through the head portion of the crosshead extruder (see FIG. Two-layer extrusion). As a result, a straight handrail pipe (the pipe member 10 on which the foamed resin layer 20 is formed) is produced. In addition, you may form the foamed resin layer 20 (and coating layer 25) in the pipe member 10 with another shaping | molding method.

In the foamed resin layer 20 forming step (S200) of the present embodiment, the foamed resin layer 20 is formed so as to include an unfoamed foaming agent (21). Therefore, in the formation process of the foamed resin layer 20, resin molding is performed at a low temperature as much as possible. However, in order to perform resin molding, at least a heating temperature of 135 ° C. to 150 ° C. is required for resin molding. Therefore, even at that temperature, a foaming agent (21) containing an unfoamed foaming agent (21) is used. ) Is required. In the configuration example of this embodiment, the base resin material is PVC, resin molding is performed at a molding heating temperature of 165 ° C. (or a temperature range of 130 ° C. to 170 ° C.), and unfoamed according to the conditions. A foaming agent that remains in a state (for example, an inorganic foaming agent or a microcapsule) is used. In the subsequent step, when the resin-molded foamed resin layer 20 is heated, the foaming agent in an unfoamed state is foamed, and the uneven pattern portion 60 is formed.

Next, the handrail pipe (the pipe member 10 on which the foamed resin layer 20 is formed) is placed in the mold (step S300). 5 and 6 are diagrams showing the configuration of the mold 200 of the present embodiment. The mold 200 according to the present embodiment has a configuration (separable configuration) that can be disassembled into a first mold (lower mold) 31 and a second mold (upper mold) 32. In FIG. 5, the structure which looked at the metal mold | die 200 (31, 32) of this embodiment from the upper side is shown. Further, FIG. 6 shows a configuration in which the mold 200 (31, 32) is viewed from the horizontal direction.

In the mold 200 of the present embodiment, a cavity 38 is formed in the first mold (lower mold) 31. The cavity 38 has a shape corresponding to the concavo-convex pattern portion 60. In the mold 200 of the present embodiment, only the first mold (lower mold) 31 corresponds to the shape of the handrail 100 shown in FIG. 3 (particularly, the arrangement / shape of the uneven pattern portion 60). A cavity 38 is formed. However, the cavity 38 may be formed in the second mold (upper mold) 32 depending on the shape of the handrail 100 (particularly, the arrangement / shape of the concavo-convex pattern portion 60), and the first mold 31 and A cavity 38 may be formed in both of the second molds 32.

The center opening 35 (35A, 35B) is formed in the mold 200 of the present embodiment. In the center opening 35, a pipe member 10 (handrail pipe) in which the foamed resin layer 20 is formed can be disposed. In the illustrated example, a cavity 38 corresponding to the shape (structure) of the concavo-convex pattern portion 60 is formed on the surface of the central opening 35 A of the first mold 31. Each cavity 38 is formed with a suction hole 39 for sucking air in the cavity 38. In addition, a suction tube 40 communicating with the suction hole 39 is connected to the mold 200 (31). In the configuration example of the present embodiment, the suction pipe 40 is connected to a part (air hole) of the mold 31 via a connection member (coupling member) 41. A part (air hole) of the mold 201 is connected to the suction hole 39 through the mold.

The mold 200 according to the present embodiment includes a metal mold body 30 made of metal (here, aluminum). A central opening 35 (35A, 35B) is formed at the center of the mold main body 30. An upper surface (contact surface) 33 is formed around the center opening 35 (opening end). The upper surfaces 33 are in contact with each other, and the first mold 31 and the second mold 32 are integrated. In the configuration example of the present embodiment, a protrusion 36 is provided on the first mold 31 in order to prevent misalignment when the first mold 31 and the second mold 32 are matched. The second mold 32 is provided with a recess 37 that fits in correspondence with the protrusion 36. Note that the first mold 31 and the second mold 32 may be reversed in the combination of the protrusion 36 and the recess 37. Or you may employ | adopt joining mechanisms other than the projection part 36 and the recessed part 37 (For example, the fitting mechanism of the unevenness | corrugation which mutually fits or a waveform, the joining mechanism by magnetic force, etc.).

FIG. 7 shows an enlarged part of the first mold 31. FIG. 8 shows the structure of the cavity 38 in an enlarged manner. Cavities 38 are formed at the bottom of the central opening 35A of the first mold 31 in a line at equal intervals. The cavity 38 of the present embodiment includes a bottom surface portion 31u corresponding to the pattern portion (pattern surface) 61a of the concavo-convex pattern portion 60 and a peripheral edge portion (inclined portion) 31e located around the bottom surface portion 31u. The bottom surface portion 31u of the cavity 38 is formed with a suction hole 39 for sucking air in the cavity 38. Further, the bottom surface portion 31u of the cavity 38 is connected to the surface (die contact surface 31b) of the central opening portion 35A via the peripheral edge portion 31e.

FIG. 9 shows a state in which the first mold 31 and the second mold 32 are combined. More specifically, a handrail pipe (foamed resin) is inserted into the central opening 35 of the first mold 31 (or the second mold 32) with the mold 200 opened as shown in FIG. 5 or FIG. The pipe member 10) on which the layer 20 is formed is set. Next, when the first mold 31 and the second mold 32 are overlapped with the handrail pipe set, the state shown in FIG. 9 is obtained. In addition, the mold 200 of the present embodiment is provided with a heater, and the mold 200 can be heated by the heater. The heater of this embodiment is, for example, a rod heater, and the heater is directly attached to the metal mold 200. A temperature sensor can be attached to the mold 200, and temperature control can be performed so that the temperature becomes constant (or appropriate temperature, set temperature).

Next, the mold 200 on which the handrail pipe is set is heated (step S310). Specifically, the foamed resin layer 20 of the handrail pipe is heated by heating the mold 200. Since the unfoamed foaming agent (21) is foamed by heating the mold 200, the mold 200 is firmly fixed (tightened) so as to withstand the expansion of the foaming. The mold 200 is heated (or the foamed resin layer 20 is heated) at a predetermined temperature (appropriate temperature) and is heated for a predetermined time (appropriate time). After the predetermined heating, the temperature may be kept, or the heating may be stopped and left for a certain time. In an example of the heating step (S310) of the present embodiment, the base resin material is PVC, a foaming agent (for example, an inorganic foaming agent, microcapsule), and the heating temperature is 165 ° C. (or 150 ° C. to 180 ° C.). In the temperature range of 20 to 30 minutes.

In addition to the heating process (S310) of the mold 200, the interior of the mold 200 (particularly, the interior of the cavity 38) is sucked (process S320). Specifically, the inside of the cavity 38 is set to a negative pressure. This suction step (S320) may be started at the same time as the mold heating step (S310), or may be performed before the mold heating step (S310). Alternatively, the suction step (S320) may be performed after the mold heating step (S310) is started. In addition, the suction step (S320) may be completed simultaneously with the mold heating step (S310), or the suction step (S320) may be terminated after the mold heating step (S310) is completed. Good. Alternatively, the suction step (S320) may be terminated before the mold heating step (S310) is completed. The start / end timing can be appropriately determined according to various conditions (manufacturing process, manufacturing equipment, required product specifications, etc.).

In the suction step (S320) of the present embodiment, the inside of the cavity 38 is reduced in pressure (negative pressure) by the suction hole 39 connected to the suction pipe 40. The suction tube 40 is connected to a decompression device (vacuum pump), and the inside of the cavity 38 can be set to a negative pressure by operating the decompression device (vacuum pump). The decompression capability of the decompression device (vacuum pump) is, for example, 0.03 to 0.08 MPa (attainment vacuum).

By applying a negative pressure in the cavity 38 while heating the mold 200, the unfoamed foaming agent (21) foams (expands), and the resin material containing the foaming agent (21) Filling, thereby forming the concavo-convex pattern portion 60 having concavo-convex (pattern) (step S350). In the experiment of the present inventor, even if an unfoamed foaming agent (21) foams (expands) and fills the cavity 38 without applying a negative pressure to the cavity 38, the cavity 38 cannot be filled well, and unevenness ( The uneven pattern portion 60 having the pattern) could not be formed cleanly. A number of failure examples have been conceived in which a non-foamed foaming agent (21) foams (expands) while the inside of the cavity 38 is under a negative pressure, whereby the uneven pattern portion 60 can be formed cleanly. .

The heating temperature and heating time of this embodiment vary depending on the materials used and the manufacturing conditions, but in one example, the heating temperature is 150 ° C. to 180 ° C., and the heating time is 20 minutes to 30 minutes. After performing the process (S350) which forms the uneven | corrugated pattern part 60, a heating is stopped and the temperature of the metal mold | die 200 is lowered | hung until it becomes below the softening temperature of a resin material. Then, the metal mold | die 200 is opened and the handrail 100 (handrail pipe) of this embodiment is taken out (process S400). Thus, the handrail 100 (the handrail 100 with the unevenness (pattern)) in which the uneven pattern portion 60 is formed can be obtained (step S500).

FIG. 10 shows the configuration of the handrail 100 produced by the manufacturing method of the present embodiment, and the viewing angle is different from that shown in FIG. FIG. 11 is an enlarged view of the uneven pattern portion 60 of the handrail 100. As shown in FIG. 11, according to the manufacturing method of this embodiment, the unfoamed foaming agent (21) foams (expands), and the resin material containing the foaming agent (21) fills the cavity 38 firmly. As a result, the concavo-convex pattern portion 60 can be formed cleanly (as intended or as designed).

In the manufacturing method of this embodiment, after preparing the pipe member 10 (step S100), the foamed resin layer 20 is formed on the surface 10a of the pipe member 10 (step S200), and then the pipe member (handrail pipe). Is placed in the mold 200 (step S300). Next, while the mold is heated (step S320), the inside (38) of the mold 200 is sucked (step S320). Thus, the uneven | corrugated pattern part 60 is formed in the foamed resin layer 20 (process S350). The mold 200 of the present embodiment includes a cavity 38 corresponding to the uneven pattern portion 60, and a suction hole 39 is formed in the cavity 38. And in the process (process S350) which forms the uneven | corrugated pattern part 60, the foamed resin layer 20 is heated, making the inside of the cavity 38 into a negative pressure. Then, according to the method of the present embodiment, when the concave / convex pattern portion 60 is formed in the foamed resin layer 20 using the mold 200 provided with the cavity 38 corresponding to the concave / convex pattern portion 60, the inside of the cavity 38 is negative. By heating the foamed resin layer 20 while applying pressure, the expanding foamed resin layer 20 can be brought into firm contact with the surface of the cavity 38. As a result, since the uneven pattern portion 60 can be stably and stably formed on the foamed resin layer 20, an arbitrary pattern / unevenness can be formed on the surface (100a) of the handrail (100).

In the present embodiment, a heater is attached to the mold 200 and the mold 200 is heated by the heater. However, other methods (heating methods) may be employed as long as the heater can be heated at a set temperature for a certain time. . For example, after placing the pipe member 10 (handrail pipe) on which the foamed resin layer 20 is formed in the mold 200, the mold 200 is put in an oven (for example, a furnace such as a gear oven or a dryer), and is fixed. You may make it hold | maintain for a fixed time (or desired predetermined time) at temperature (or desired setting temperature). Alternatively, after placing the pipe member 10 (handrail pipe) on which the foamed resin layer 20 is formed in the mold 200, the mold 200 is hung in an oven (such as a drying furnace) and left there at a predetermined temperature for a predetermined time. May be. In addition, any heating device (heating means) that can be heated and held at a certain temperature with a certain degree of accuracy can be used.

FIG. 12 schematically shows the configuration of the resin layer forming apparatus 300 used in the manufacturing method of the present embodiment. The resin layer forming apparatus 300 of the present embodiment is an apparatus that forms the foamed resin layer 20 containing the foaming agent (21) on the surface 10a of the pipe member 10. A resin layer forming apparatus 300 shown in FIG. 12 is an extrusion molding apparatus (in this example, a crosshead extrusion molding apparatus) including a head portion 310 through which the pipe member 10 passes. When the illustrated extrusion molding apparatus (crosshead extrusion molding apparatus) is used, when the pipe member 10 is passed through the opening 315 of the head portion 310, a lower layer material (resin base material made of a general-purpose resin material) is formed on the surface 10a of the pipe member 10. A foamed resin layer 20) containing a foaming agent and a surface layer material (a coating layer 25 made of a general-purpose resin material) can be formed. In other words, two-layer extrusion molding of the lower layer material (foamed resin layer 20) and the surface layer material (coating layer 25) can be performed.

In the resin layer forming apparatus (crosshead extrusion molding apparatus) 300 of the present embodiment, an extrusion molding main body portion 320 that extrudes a resin material, a connection portion 322 that connects the extrusion molding main body portion 320 and the head portion 310, and a resin material ( And a charging port 350 for charging a resin pellet or the like. Conveying devices (here, a roller conveyor 400 or a belt conveyor) 400A and 400B are provided on the front surface side 311 and the back surface side 322 of the head portion 310, respectively. When the pipe member 10 is inserted into the opening 315 on the surface side 311 of the head portion 310 from the conveying device 400A, the foamed resin layer 20 with the coating layer 25 is applied to the surface 10a of the pipe member 10. In the resin layer formation (step S200) by the resin layer forming apparatus (extrusion molding apparatus) 300, a low temperature (a temperature higher than that by a predetermined temperature with respect to the foaming start point (foaming) so that the foaming agent does not completely foam. The resin molding is performed at a temperature lower than the starting point (for example, about 130 ° C. to 150 ° C.) In this way, the foamed resin layer 20 containing the foaming agent (21) in an unfoamed state. Is formed on the pipe member 10. At this stage, a straight handrail pipe (without the uneven pattern portion, that is, without dimples) is formed, and then the handrail pipe is disposed on the mold 200 to form the uneven pattern. The part 60 will be formed.

In the manufacturing method of the present embodiment, the suction hole 39 is provided in the cavity 38 of the mold 200, and the suction pipe 40 is communicated with the suction hole 39 so that the inside of the cavity 38 is in a reduced pressure state (negative pressure). You may make the inside of the cavity 38 into a pressure-reduced state (negative pressure) using the method of other than that. FIG. 13 is a flowchart for explaining a modification of the manufacturing method of the present embodiment.

In the manufacturing method shown in FIG. 13, like the step S300 shown in FIG. 4, after the handrail pipes (10, 20) are placed in the mold 200 (step S300), the mold 200 is placed in the chamber (step S300). Step S600). When mass-producing the handrail 100 of the present embodiment, the mold 200 can be placed in a plurality of chambers (for example, 10 or more) instead of only one.

Next, the inside of the cavity 38 of the mold 200 is set to a negative pressure (depressurized state) by setting the inside of the chamber to a negative pressure (step S610). As shown in FIG. 8, a suction hole 39 may be provided in the bottom surface portion 31u of the cavity 38, and the inside of the cavity 38 may be set to a negative pressure through the suction hole 39. The cavity 38 may have a negative pressure in conjunction with the state) (for example, the cavity 38 and the chamber are connected not through the suction hole 39 but through another communication space (passage)). .

Next, the inside of the chamber is heated, thereby heating the mold 200 disposed in the chamber (step S620). By the heating, the foamed resin layer 20 disposed in the mold 200 is further foamed (step S630). This foaming is the expansion of the foaming agent in the unfoamed state of the foamed resin layer 20, whereby the foamed resin layer 20 is filled into the cavity 38, and the uneven pattern portion 60 (unevenness or pattern) is formed. (Step S650).

Subsequently, after stopping heating and decompression of the chamber, the mold 200 is taken out from the chamber (step S700), and then the handrail 100 (handrail pipe) of the present embodiment is removed from the mold 200 (step S710). . When a plurality of molds 200 are arranged in the chamber, all the molds 200 are taken out from the chamber, and the handrail 100 (handrail pipe) is removed from the mold 200. In this way, the handrail 100 with unevenness (pattern) is obtained (step S800).

The manufacturing method shown in FIG. 13 has an advantage that it is not necessary to set the suction tube 40 in each mold 200 when a plurality of molds 200 are used. Further, even if each die 200 is not provided with a heater, there is an advantage that a plurality of die 200 can be heated at a time by heating with a heating type chamber. Therefore, it is suitable for manufacturing a large number of handrails 100.

Next, the handrail 100 (Example) produced by the method of the present embodiment will be described with reference to FIGS.

The handrail 100 shown in FIG. 14 has a structure in which annular convex portions 61 and annular concave portions 62 are alternately and neatly formed as the concavo-convex pattern portion 60. Such a clean wavy surface cannot be realized by the conventional manufacturing method, and can be realized by the manufacturing method of this embodiment. In the concavo-convex pattern portion 60 shown in FIG. 14, the first convex portion (high annular convex portion) 61 C having a high height, and the second convex portion (low annular convex portion) 61 D having a lower height than the first convex portion, Are arranged alternately with the recesses 62 in between. Note that the annular projections 61 (for example, 61C or 61D) having the same height may be arranged with the recess 62 interposed therebetween, or the annular projections 61 having different heights may be arranged. In this example, the difference in height between the top of the first convex portion (high annular convex portion) 61C and the surface of the non-forming region 69 (or the bottom surface of the concave portion 62) is, for example, 5 mm (or more). is there. Further, the difference in height between the second convex portion (low annular convex portion) 61D and the surface of the non-forming region 69 (or the bottom surface of the concave portion 62) is 2 mm (or 3 mm or more), for example. . Moreover, although the upper limit of the said height is not specifically limited, For example, it is 10 mm or less, or 7 mm (or 5 mm) or less.

In the handrail 100 shown in FIG. 15, a convex portion 61 E (61) having the shape of a playing card mark is formed as the concave / convex pattern portion 60. In the configuration shown in FIG. 15, the side surface (wall surface) 61 s of the convex portion 61 extends substantially vertically (for example, 80 ° or more (or 85 ° or more), 90 ° or less). The structure in which the side surface 61s extends in a substantially vertical manner as described above can be realized by the manufacturing method of this embodiment. Thus, in order to form the substantially vertical side surface 61s cleanly, it is preferable to optimize the temperature condition and the evacuation condition. In this embodiment, in the mold heating step (S310) and the suction step (S320), the evacuation time (eg, 1 minute or less) than the heating time (eg, 7 minutes or more, or 9 minutes or more). ) Is shortened. However, it is preferable that the optimum conditions (temperature conditions and vacuuming conditions) are appropriately determined according to the resin used, the dimensions, the shape of the concavo-convex pattern portion 60, and the like. The difference in height between the convex portion 61E (the convex pattern of the playing card shape or geometric mark shape) and the surface of the non-formation region 69 in this embodiment is, for example, 2 mm (or 3 mm or more). . Moreover, although the upper limit of the said height is not specifically limited, For example, it is 10 mm or less, or 7 mm (or 5 mm) or less.

In the handrail 100 shown in FIG. 16, as the concavo-convex pattern portion 60, a convex portion 61F of a pattern mainly composed of a curve (here, a footprint mark), a convex portion 61G (61) having a gentle curve, and a playing card The convex portion 61E (61) having the shape of the mark is formed on the same surface. The side surface 61s of the protrusion 61F of the footprint mark has a clean and substantially vertical surface. Further, the side surface 61t of the gently curved convex portion 61G is not vertical but is a mountain-shaped inclined surface. In the present embodiment, patterns with different patterns (61F, 61G) can be formed on the same surface in this way.

Moreover, the handrail 100 as shown in FIG. 17 can be manufactured. In the configuration shown in FIG. 17, the convex portion 61E (playing card mark) shown in FIG. 15 is formed on the lower surface in the drawing, and the convex portion 61F (footprint mark) and convex portions shown in FIG. 16 are formed on the upper surface in the drawing. A portion 61G (a mountain-shaped gentle convex mark) is formed. According to the present embodiment, marks (uneven pattern 60) that are different between the upper surface (one side) and the lower surface (the other side) can be produced in a single manufacturing process.

In the handrail 100 shown in FIG. 18, as the concavo-convex pattern portion 60, a convex portion 61H made of a logo mark (brand mark, company logo, etc.) and a convex portion 61X made of characters (kanji, symbols, katakana, hiragana or alphabet). Are formed on the same surface. The height of the convex portion 61X (the height of the side surface 61s) is, for example, not less than 0.5 mm and not more than 5 mm (in the example, 1 to 2 mm). Such a convex portion 61X of a clean character cannot be realized by the conventional manufacturing method, and can be realized by the manufacturing method of the present embodiment.

Furthermore, in the handrail 100 shown in FIG. 19, a fibrous convex portion 61 Y is formed as the concave / convex pattern portion 60. The length of the fibrous convex portion 61Y is, for example, 3 mm to 10 mm (in the example, 5 mm). Further, the diameter (thickness) of the fibrous convex portion 61Y is, for example, 0.5 mm to 2 mm (1 mm in one example). Such a beautiful fibrous convex portion 61Y cannot be realized by the conventional manufacturing method, and can be realized by the manufacturing method of the present embodiment. Moreover, the fibrous convex part 61Y can be formed in the same handrail 100 (for example, the mutually opposite surface or the same surface) as the convex part 61X of the character shown in FIG. 18, for example.

As mentioned above, although this invention has been demonstrated by suitable embodiment, such description is not a limitation matter and, of course, various modifications are possible. In the above-described embodiment, the handrail is described as an example of the pipe structure having the foamed resin layer. However, the method of the embodiment of the present invention is not limited to the handrail, but other pipe structures (for example, aluminum). (Pipe, iron pipe, SUS pipe). In addition, modifications such as an elliptical pipe, a square pipe, a flat bar, and an aluminum variant may be performed. When applying the technique of this embodiment (including the technique of “a pipe structure including an unfoamed foaming agent”), the structure of the pipe structure can be designed and constructed (manufactured) relatively freely. As a result, it is possible to improve the grip characteristics of handrails (for example, to create a structure that does not slip even if there is no gripping force), or to create a sealing material such as a pipe (insert into a hole such as a pipe, and then apply heat) That can be used for airtight materials such as buildings and housing sashes, etc., and building smoke-proofing effects when expanded in the event of a fire. May be. Further, a modification may be made to improve productivity by simultaneously executing a plurality of manufacturing steps (for example, a molding step in two steps).

According to the present invention, it is possible to provide a method for manufacturing a handrail capable of forming an arbitrary pattern / unevenness on the handrail surface.

10 Pipe member (aluminum pipe)
DESCRIPTION OF SYMBOLS 20 Foamed resin layer 25 Coating layer 30 Mold body part 35 Center opening part 38 Cavity 39 Suction hole 40 Suction pipe 60 Concavity and convexity part 61 Convex part 62 Concave part 69 Non-formation area 90 Pipe member 100 Handrail 200 Mold 300 Resin layer formation Equipment (extrusion molding equipment)
310 Head 400 (400A, 400B) Conveying device

Claims

A handrail manufacturing method,
Forming a foamed resin layer containing a foaming agent on the surface of the pipe member;
Placing the pipe member on which the foamed resin layer is formed in a mold;
Forming a concavo-convex pattern portion in the foamed resin layer,
The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer,
The cavity is formed with a suction hole for sucking air in the cavity,
In the step of forming the concavo-convex pattern portion, a manufacturing method is performed in which the foamed resin layer is heated while the inside of the cavity is set to a negative pressure.
In the step of forming the foamed resin layer, the foamed resin layer contains an unfoamed foaming agent,
The manufacturing method according to claim 1, wherein when the foamed resin layer is heated, the foaming agent in an unfoamed state is foamed.
The pipe member is a metal circular pipe,
The step of forming the foamed resin layer is performed by extruding a resin material containing the foaming agent on the pipe member,
In the step of forming the foamed resin layer, a coating layer is formed on the outer layer of the foamed resin layer,
The said uneven | corrugated pattern part is a manufacturing method of Claim 1 or 2 formed when the height of the surface of a coating layer changes.
The mold is a metal mold provided with a heater,
The mold has a separable structure,
The mold has a central opening for accommodating the pipe member in which the foamed resin layer is formed,
The cavity is formed in a surface on which the central opening is located;
The manufacturing method according to claim 1, wherein a suction pipe that communicates with the suction hole is connected to the mold, and the foamed resin layer is heated by the heater.
A handrail manufacturing method,
Forming a foamed resin layer containing a foaming agent on the surface of the pipe member;
Placing the pipe member on which the foamed resin layer is formed in a mold;
Placing the mold in which the pipe member is disposed in a chamber;
Forming a concavo-convex pattern portion in the foamed resin layer,
The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer,
The manufacturing method of performing heating the said foaming resin layer, making the inside of the said mold into a negative pressure by making the inside of the said chamber into a negative pressure.
In the step of forming the foamed resin layer, the foamed resin layer contains an unfoamed foaming agent,
When heating the foamed resin layer, the unfoamed foaming agent foams,
The manufacturing method according to claim 5, wherein the heating of the foamed resin layer is performed by heating the inside of the chamber.
The manufacturing method according to claim 5 or 6, wherein a suction hole for sucking air in the cavity is formed in the cavity in the mold.
A manufacturing device for manufacturing a handrail,
A resin layer forming device for forming a foamed resin layer containing a foaming agent on the surface of the pipe member;
A mold in which the pipe member on which the foamed resin layer is formed is disposed,
The mold includes a cavity corresponding to a concavo-convex pattern portion formed on the surface of the foamed resin layer,
The manufacturing apparatus, wherein suction holes for sucking air in the cavities are formed in the cavities.
The mold is a metal mold provided with a heater,
The mold has a separable structure,
The mold has a central opening for accommodating the pipe member in which the foamed resin layer is formed,
The manufacturing apparatus according to claim 8, wherein the cavity is formed on a surface on which the central opening is located.
The resin layer forming apparatus is an extrusion apparatus including a head portion through which the pipe member passes,
The extrusion molding apparatus is an apparatus for laminating and forming a foamed resin layer containing a foaming agent and a coating layer located on the outer surface of the foamed resin layer on the outer surface of the pipe member,
The manufacturing apparatus according to claim 8 or 9, wherein a suction pipe leading to the suction hole is connected to the mold.
A method for producing a pipe structure having a foamed resin layer,
Forming a foamed resin layer containing a foaming agent on the surface of the pipe member;
Placing the pipe member on which the foamed resin layer is formed in a mold;
Forming a concavo-convex pattern portion in the foamed resin layer,
The mold includes a cavity corresponding to the uneven pattern portion formed on the surface of the foamed resin layer,
The cavity is formed with a suction hole for sucking air in the cavity,
In the step of forming the concavo-convex pattern portion, the foamed resin layer is heated while making the inside of the cavity have a negative pressure,
In the step of forming the foamed resin layer, the foamed resin layer contains an unfoamed foaming agent,
The method for producing, wherein the foamed resin layer is foamed when the foamed resin layer is heated.
The pipe member is a metal circular pipe,
The step of forming the foamed resin layer is performed by extruding a resin material containing the foaming agent on the pipe member,
In the step of forming the foamed resin layer, a coating layer is formed on the outer layer of the foamed resin layer,
The said uneven | corrugated pattern part is a manufacturing method of Claim 11 formed when the height of the surface of a coating layer changes.
A handrail,
A foamed resin layer containing a foaming agent;
An uneven pattern portion formed on the foamed resin layer, and
The handrail which the side surface which prescribes | regulates the said uneven | corrugated pattern part extends substantially perpendicularly, and has a height of 1 mm or more.
The concavo-convex pattern portion is at least one selected from the group consisting of a convex portion of a geometric pattern, a convex portion of a character, and a fibrous convex portion,
The substantially vertical is an angle within a range of 80 ° to 90 °,
The handrail according to claim 13, wherein a height of a side surface defining the uneven pattern portion is 10 mm or less.
A coating layer is formed on the outer layer of the foamed resin layer,
The handrail according to claim 13 or 14, wherein the concavo-convex pattern portion is formed by changing the height of the surface of the coating layer.
The handrail according to any one of claims 13 to 15, wherein the uneven pattern portion is formed by sucking the foamed resin layer while heating.