JPS6061260A - Manufacture of handrail - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND AND OBJECTS OF THE INVENTION The present invention relates to a method of manufacturing a novel handrail.

Escalators and auto lines are in department stores and airports.

Because they are used in service industries such as stations, aesthetics are an important commercial value. For this reason, handrails used as handrails on escalators and auto lines are always required to be aesthetically pleasing.

However, handrails are structurally very susceptible to dirt. The handrail is obtained by press vulcanizing an unvulcanized colored decorative rubber layer on top of a core made of thick-edged canvas in the form of a band with a substantially C-shaped cross section. The colored cosmetic rubber layer after vulcanization plays the role of always giving a sense of beauty to an unspecified number of people. However, when viewed microscopically, the surface of the handrail is made up of a rough surface unique to vulcanized rubber, so it is prone to attracting various dirt substances.

That is, since the handrail is touched by the hands of an unspecified number of people when operating an escalator or an auto line, it is inevitable that dirt, chewing gum, dust, etc. will adhere to the surface of the handrail. For this reason, escalator and auto line managers regularly clean the handrail surfaces with clean wet cloths, but they are unable to remove them completely and the dirt gradually becomes more noticeable. This stain can be washed off with surfactants or organic solvents, but in that case discoloration, swelling, and cracking of the colored decorative rubber layer are unavoidable.

The present invention has been made from this point of view, and its purpose is to prevent the hands from leaving any marks even if they come into contact with the hands of an unspecified number of people, and even if they do get marks, they can be cleaned with a damp cloth. An object of the present invention is to provide a method for manufacturing a handrail that can be extracted.

[Summary of the invention]

The gist of the present invention is to place a core body in which thick-edged canvas is laminated in a C-shaped band shape in a mold, overlay an unvulcanized colored decorative rubber layer on the core body, and then press vulcanize it. In the method for producing a handrail, a hot melt film having a softening point of 130° C. or less and a thickness of 0.8 mm or less is superimposed on the unvulcanized colored decorative rubber layer, and the upper layer of the hot melt film has a heat softening point of 0.8 mm or less. A linear polymer film having a temperature of 185° C. or higher and a critical surface tension of 34 or lower is layered, and then the thermal softening point of the hot melt film is at least 10° C. or higher,
A method for producing a handrail, characterized in that press vulcanization is carried out at a temperature that is at least 6° C. lower than the thermal softening point of a linear polymer film having a critical surface tension of 34 or less.

In the present invention, the softening point of the Botmelt film used as the upper layer of the unvulcanized colored decorative rubber is set to be below IAO'C and the thickness is set to below 0.8 mm for the following reasons. The reason why the softening point is 130'C or less is that the softening point is 30°C.
The above hot melt film has a temperature range of 130 to 180, which is the commonly used vulcanization temperature range for unvulcanized adhesive/removable rubber for handrails.
This is because bot melt adhesion does not occur in the temperature range of 'C.

In addition, the thickness of the hot melt film was set to 0.8 mm or less because the hot melt adhesion between the colored decorative rubber layer and the linear polymer film with a critical surface tension of 34 or less was 0.8 mm or less.
This is because a hot melt film of a size smaller than 100 ml is sufficient. Examples of this type of hot melt film include polyethylene vinyl acetate copolymer film and polyvinyl butyral film.

The thermal softening point of the linear polymer film is set to 185°C or higher because the linear polymer film with a thermal softening point of 185°C or lower is 130 to 180°C, which is the commonly used vulcanization temperature range for unvulcanized colored decorative rubber for handrails. This is because it is thermally softened at ℃. In addition, the critical surface tension of the linear polymer film is 3
The reason for setting the critical surface tension to 4 or less is that a linear polymer film with a critical surface tension of 34 or less tends to have dirt components such as hand grime stuck to it, and is also easily attacked by surfactants and organic solvents. Linear polymer films with a thermal softening point of 185° C. or higher and a critical surface tension of 34 or lower include polytetrafluoroethylene film, polyfluorinated ethylene propylene copolymer film, polychlorotrifluoroethylene film,
Examples include polyethylenetetrafluoroethylene copolymer.

〔Example〕

Next, with reference to the drawings, 1 of the method for manufacturing the handrail of the present invention will be explained.
An example will be explained.

FIG. 1 is a cross-sectional view showing one embodiment of the handrail manufacturing method of the present invention, and FIG. 2 is a perspective view of a handrail manufactured by one embodiment of the handrail manufacturing method of the present invention. It is something.

In the method of manufacturing a handrail of the present invention, as shown in FIG. A mold consisting of an upper mold 3 is used. Among these, medium size 2 has a structure divided into three parts.

Comparative Example Unvulcanized blue decorative rubber δ molded into a C-shape in advance in the lower mold 1
was placed, a core body made of thick-edged canvas laminated in a C-shaped band was layered on top of the core body, the middle mold 2 was layered on top of the core body, and the upper mold 3 was further layered on top of that, and then press vulcanization was carried out for 150'CI hours. .

The handrail was installed on an escalator in a department store, and an actual load test was conducted for one month.

After one month, the handrail was very dirty and did not come off even after wiping it with a wet cloth. Even when I tried wiping the dirty handrail surface with a neutral detergent, the dirt did not come off completely. Furthermore, when the soiled surface was washed with a mixed solvent of ethanol and xylene in a volume ratio of 1:1, swelling of the decorative rubber layer occurred.

EXAMPLE A polychlorotrifluoroethylene film 21 having a heat softening point of 218° C., a critical surface tension of 31, and a thickness of 2 mm is placed on the lower mold 1, and a polychlorotrifluoroethylene film 21 having a heat softening point of 115° C. and a thickness of 0.
04mm polyvinyl butyral film 20 layered,
Furthermore, on top of that, unvulcanized blue rubber that has been molded into a C-shape is layered, and finally, a core body made of thick-edged canvas laminated in a C-shape is layered, then the middle mold 2 is layered, and the upper mold is placed on top of that. were piled up and press vulcanized at 150°C for 1 hour.

The obtained hunt rail was attached to an escalator installed in a department store, and a one-month actual load test was conducted. The dirt on the exterior of the hunt rail after one month was not noticeable. The exterior of the handrail, which was wiped with a wet cloth, showed no dirt. This handrail has a volume ratio of ethanol and xylene of 1
No abnormality was observed even after washing with a :l mixed solvent.

〔Effect of the invention〕

According to the handrail manufacturing method of the present invention, the unvulcanized colored decorative rubber 5 is vulcanized and the unvulcanized colored decorative rubber 5 is vulcanized in one step.
It is possible to bond the vulcanized colored decorative rubber 5 and the linear polymer film 21 via the hot melt film 20, and it can be manufactured at low cost.

The obtained handrail has low contamination. The reason why the handrail obtained according to the present invention has excellent stain resistance is that it is difficult for contaminants to adhere to it and the critical surface tension is 3.
This is because four or less linear polymer films 21 are provided. Furthermore, this linear polymer film is hot-melt bonded to the vulcanized colored decorative rubber via the hot-melt film 20, and there is no problem in operation.

As described in detail above, according to the method for manufacturing a handrail of the present invention, a handrail with excellent stain resistance can be obtained and is industrially useful.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the handrail manufacturing method of the present invention, and FIG. 2 is a perspective view of a handrail manufactured by one embodiment of the handrail manufacturing method of the present invention. 1: lower mold, 2: middle mold, 3: upper mold, 4 = core body. 5: Colored cosmetic rubber layer. 20: Hot melt film. 21: Linear polymer film.

Claims (1)

[Claims] (1) A method for producing a handrail in which a core body made of thick-edged canvas laminated in a C-shaped band is placed in a mold, unvulcanized colored decorative rubber is layered on the core body, and then press vulcanization is performed. , overlaying the unvulcanized colored decorative rubber layer with a hot melt film having a softening point of 130° C. or less and a thickness of 0.8 mm or less;
A linear polymer film having a thermal softening point of 185° C. or higher and a critical surface tension of 34 or lower is superimposed on the hot melt film, and then a linear polymer film having a thermal softening point of at least 10° C. or higher and a critical surface tension of 34° C. is higher than the thermal softening point of the hot melt film. A method for producing a handrail, comprising press vulcanization at a temperature at least 5° C. lower than the thermal softening point of the following linear polymer film.