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WO2025037422A1 - Main courante mobile pour escalier mécanique et son procédé de fabrication - Google Patents

Main courante mobile pour escalier mécanique et son procédé de fabrication Download PDF

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Publication number
WO2025037422A1
WO2025037422A1 PCT/JP2023/029741 JP2023029741W WO2025037422A1 WO 2025037422 A1 WO2025037422 A1 WO 2025037422A1 JP 2023029741 W JP2023029741 W JP 2023029741W WO 2025037422 A1 WO2025037422 A1 WO 2025037422A1
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WO
WIPO (PCT)
Prior art keywords
handrail
resin composition
crystallization
molded product
escalator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2023/029741
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English (en)
Japanese (ja)
Inventor
貴至 西村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2023/029741 priority Critical patent/WO2025037422A1/fr
Publication of WO2025037422A1 publication Critical patent/WO2025037422A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands

Definitions

  • This disclosure relates to a handrail for an escalator and a method for manufacturing the same.
  • Escalator handrails are molded products made of a composite material containing thermoplastic resin, metal steel wire, and canvas, and after molding, they must be cooled and solidified without wetting the canvas with a refrigerant and while maintaining the molded handrail shape.
  • Patent Document 1 JP 2014-162218 A discloses a method of cooling using a cooling mold and a cooling core mold, rather than cooling by directly contacting the molded product with cooling water.
  • Patent Document 2 JP 2010-538932 A discloses a method of cooling by using a core with a vacuum source to bring a refrigerant into contact with the outer surface of the molded product while the molded product is tightly adhered by a vacuum.
  • Patent Documents 1 and 2 both involve cooling the canvas side of the handrail while holding it in a core, which requires complex, large-scale equipment. Furthermore, in order to cool the canvas without getting wet with the refrigerant, it is necessary to adjust the flow rate of the refrigerant so that it comes into contact with the side of the handrail opposite the canvas side. For this reason, this type of cooling inevitably results in slow cooling, which promotes crystallization, particularly in crystalline resin compositions that contain pigments, and causes significant shrinkage on the side of the handrail opposite the canvas side (i.e., the front surface), making it difficult to maintain the shape of the handrail.
  • the present disclosure aims to solve the above problems and provide a molded product that combines a highly crystalline resin composition containing a pigment, metal steel wire, and canvas, without wetting the canvas with a refrigerant after molding, and by cooling the molded handrail while maintaining its shape, thereby providing a moving handrail for escalators with high dimensional accuracy, and a manufacturing method thereof.
  • the manufacturing method for a moving handrail for an escalator includes a molding step of compositing and molding a resin composition containing a thermoplastic resin, a pigment, and a crystallization retarder with a metal steel wire and canvas to obtain a molded product in the shape of a handrail, and a cooling and solidifying step of cooling and solidifying the molded product while maintaining the handrail shape, without wetting the canvas with a refrigerant and without using a core to maintain the handrail shape.
  • the crystallization temperature of the resin composition is equivalent to the crystallization temperature of the thermoplastic resin.
  • An escalator handrail includes a resin composition containing a thermoplastic resin, a pigment, and a crystallization retarder, a metal steel wire, and a canvas.
  • the thermoplastic resin is a polyurethane elastomer.
  • the pigment contains carbon black.
  • the crystallization retarder contains nigrosine. The mass ratio of the crystallization retarder to the pigment is 0.15 or more.
  • a molded product is made by combining a pigment-containing crystalline resin composition with a metal steel wire and canvas, and by cooling the canvas after molding without wetting it with a refrigerant and while maintaining the molded handrail shape, it is possible to provide a moving handrail for escalators with high dimensional accuracy and a manufacturing method thereof.
  • FIG. 1 is a schematic cross-sectional view showing an example of a handrail for an escalator in the present disclosure.
  • FIG. 2 is a flowchart showing an example of a manufacturing method for a moving handrail for an escalator in the present disclosure.
  • FIG. 3 is a schematic diagram showing an example of a manufacturing apparatus used in the method for manufacturing a handrail for an escalator according to the present disclosure.
  • FIG. 4 is an enlarged schematic view of a main portion of an example of the molded product cooling and solidifying section of the manufacturing apparatus shown in FIG.
  • FIG. 5 is a graph showing the crystallization temperatures of resin compositions containing various pigments.
  • FIG. 6A is a schematic cross-sectional view showing the flow direction of a refrigerant that comes into contact with the escalator handrail in the cooling and solidifying step.
  • FIG. 6B is a schematic cross-sectional view showing the direction of compressive stress applied to the escalator handrail in the cooling and solidifying process.
  • FIG. 7 is a graph showing the relationship between the crystallization temperature of a resin composition in which various pigments have been added to a thermoplastic resin and the difference in the size of the opening between a molded product of the resin composition and a molded product of a thermoplastic resin.
  • FIG. 8 is a graph showing the relationship between the melt flow rate and the crystallization temperature in a resin composition in which carbon black is added to a thermoplastic resin of the same grade but different in resin viscosity.
  • the manufacturing method of the escalator handrail according to the present embodiment includes a molding step S1 in which a resin composition 12 containing a thermoplastic resin, a pigment, and a crystallization retarder, a metal steel wire 14, and a canvas 16 are compounded and molded to obtain a molded product in the shape of a handrail, and a cooling and solidifying step S2 in which the molded product is cooled and solidified while maintaining the shape of the handrail without wetting the canvas 16 with a refrigerant 24c and without using a core for maintaining the shape of the handrail.
  • the crystallization temperature of the resin composition is equivalent to the crystallization temperature of the thermoplastic resin.
  • the manufacturing method of the escalator handrail according to the present embodiment includes the above-mentioned molding step S1 and cooling and solidifying step S2, and the crystallization temperature T (°C) of the resin composition containing a thermoplastic resin, a pigment, and a crystallization retarder is equal to the crystallization temperature T 0 (°C) of the thermoplastic resin.
  • the crystallization temperature T (°C) being equal to the crystallization temperature T 0 (°C) means that the temperature difference
  • (°C) between the crystallization temperatures is 5°C or less, the crystallization temperature rise caused by the pigment is suppressed by the crystallization inhibitor, and an escalator handrail with a stable handrail shape is obtained, regardless of the type and content of the pigment, with little variation in the opening dimensions.
  • is preferably 3°C or less, more preferably 1°C or less, and even more preferably 0.5°C or less.
  • the escalator handrail 10 obtained by the manufacturing method according to this embodiment is a composite material containing a resin composition 12, metal steel wire 14, and canvas 16.
  • the dimension indicated by the arrow is called the opening dimension 10as. If this opening dimension is not within an appropriate range, there is a risk of problems occurring, such as the escalator handrail coming off when the escalator is in motion. Therefore, it is necessary to keep this opening dimension within an appropriate range.
  • the manufacturing apparatus 20 used in the manufacturing method according to the present embodiment includes a molded product forming section 22, a molded product cooling and solidifying section 24, and a molded product removal section 26.
  • the molded product forming section 22 includes a raw material injection section 221 for injecting the raw material 11, an extrusion molding machine 223 for extruding the resin composition 12, a metal steel wire supply roll 227 for supplying the metal steel wire 14, a canvas supply roll 225 for supplying the canvas 16, and a molding die 229 for taking in and molding the resin composition 12, the metal steel wire 14, and the canvas 16 together to obtain a molded product in the shape of a handrail (i.e., a moving handrail for an escalator 10).
  • a handrail i.e., a moving handrail for an escalator 10
  • the molded product cooling and solidifying section 24 includes a refrigerant shower 242 that emits a refrigerant 24c that cools and solidifies the obtained molded product (moving handrail for an escalator 10), a support table 244 for fixing the traveling direction of the molded product, and a roller shaft 246 for holding the molded product so that it does not slacken.
  • the molded product removal section 26 includes a winding drive section 262 for moving the cooled and solidified molded product (the escalator handrail 10), and a winding reel 264 for winding up the moved molded product.
  • no core is installed in the molded product cooling and solidifying section 24 to maintain the handrail shape of the molded product, the escalator handrail 10.
  • This core absorbs heat from the molded product, so if there is no temperature control mechanism in the core, the core will absorb more heat from the molded product as the molding length increases, causing the temperature to rise and the temperature distribution of the molded product during cooling to change, causing the opening dimensions of the molded product to fluctuate and become unstable.
  • a temperature control mechanism is provided over the entire length of the core in order to stabilize the opening dimensions, problems arise in that the equipment becomes more complicated and energy consumption increases. For the above reasons, it is preferable to shorten the length of the support stand 244 that fixes the traveling direction of the molded product so as not to change the temperature distribution of the molded product during cooling.
  • the molding step S1 included in the manufacturing method of the escalator handrail according to the present embodiment is a step of forming a molded product in the shape of a handrail by compositing a resin composition containing a thermoplastic resin, a pigment, and a crystallization retarder with a metal steel wire and a canvas. This step allows the molded product to be efficiently formed. This step includes the sub-steps of extruding the resin composition and molding the composite material.
  • the resin composition 12 is obtained by injecting the raw materials 11, which are a thermoplastic resin, a pigment, and a crystallization retarder, into the raw material injection section 221, and kneading and extruding them by the extrusion molding machine 223. The kneading and extrusion are performed in a state in which the thermoplastic resin is molten.
  • the resin composition 12 contains a thermoplastic resin, a pigment, and a crystallization retarder. Since the crystallization retarder suppresses the increase in crystallization temperature caused by the pigment, the resin composition has a crystallization temperature equivalent to the crystallization temperature of the thermoplastic resin itself that does not contain the pigment or the crystallization retarder (specifically, the temperature difference therebetween,
  • thermoplastic resin there are no particular limitations on the thermoplastic resin as long as it has the flexibility and strength required for an escalator handrail, but thermoplastic polyurethane elastomers are preferred because they are excellent in both flexibility and strength.
  • Thermoplastic polyurethane elastomers have crystalline hard segment portions and amorphous soft segment portions.
  • the pigment there are no particular limitations on the pigment as long as it can be added to a thermoplastic resin to color it, but it is preferable for it to contain carbon black, from the viewpoint of increasing the strength of the thermoplastic resin as well as coloring it.
  • Some pigments have the effect of promoting the crystallization of the resin composition through their nucleating agent effect. Pigments with this effect have the function of raising the crystallization temperature (solidification temperature) of the resin composition.
  • An example of a pigment with this effect is carbon black, which is used as a black pigment.
  • Figure 5 shows the crystallization temperatures of resin compositions containing various commercially available pigments used in thermoplastic polyurethane elastomers.
  • black 1 is carbon black.
  • the crystallization temperature is the temperature at the top of the exothermic peak that occurs with crystallization when the resin is cooled from a molten state of 220°C to 30°C at a rate of 10°C/min, as measured by DSC (differential scanning calorimetry).
  • DSC differential scanning calorimetry
  • the crystallization retarder is not particularly limited as long as it can suppress the increase in crystallization temperature T (°C) of the resin composition due to the pigment and make it equivalent to the crystallization temperature T 0 (°C) of the thermoplastic resin (the temperature difference
  • Nigrosine is an azine compound obtained by adding hydrochloric acid to aniline or aniline hydrochloride and nitrobenzene and subjecting them to an oxidation-reduction condensation reaction in the presence of a catalyst such as copper or iron, and is a mixture of compounds having various azine skeletons.
  • the resin composition 12 obtained by the above extrusion, the metal steel wire 14 supplied from the metal steel wire supply roll 227, and the canvas 16 supplied from the canvas supply roll 225 are combined in a molding die 229 and molded into a desired handrail shape to obtain a molded product, the escalator handrail 10.
  • Such molding is performed in a state in which the thermoplastic resin is molten and the resin composition 12 is flowing.
  • Metal Steel Wire There are no particular limitations on the metal steel wire 14 contained in the escalator handrail 10 as long as it has high adhesion to the resin composition 12 and improves the strength of the escalator handrail 10, and various types of steel wire can be used.
  • the cooling and solidifying step S2 included in the manufacturing method of the escalator handrail according to the present embodiment is a step of cooling and solidifying the molded product obtained in the molding step S1 while maintaining the handrail shape, without wetting the canvas 16 with the refrigerant 24c and without using a core to maintain the handrail shape.
  • the crystallization temperature of the resin composition is equal to the crystallization temperature of the thermoplastic resin, specifically, the temperature difference between them is 5°C or less, preferably 3°C or less, more preferably 1°C or less, and even more preferably 0.5°C or less, so that the molded product obtained in the molding step S1 can be cooled and solidified while maintaining the handrail shape, without wetting the canvas 16 with the refrigerant 24c and without using a core to maintain the handrail shape.
  • the flow direction of the refrigerant 24c that comes into contact with the escalator handrail is shown in FIG. 6A, and the direction of the compressive stress 24f applied to the escalator handrail at this time is shown in FIG. 6B.
  • the refrigerant 24c is brought into contact with the surface of the escalator handrail opposite the canvas surface, i.e., the surface, while adjusting the flow rate so as not to wet the canvas 16 with the refrigerant 24c.
  • the escalator handrail is cooled from the center of the surface side, and a temperature difference occurs between the surface side and the canvas side of the escalator handrail. For this reason, as shown in FIG.
  • Figure 7 shows the relationship between the crystallization temperature of a resin composition in which the pigment shown in Figure 5 has been added to a thermoplastic urethane elastomer, which is a thermoplastic resin, and the difference in the opening dimensions between a molded product of the resin composition and a molded product of the thermoplastic resin (more specifically, the opening dimensions of the molded product of the resin composition minus the opening dimensions of the molded product of the thermoplastic resin).
  • resin compositions with higher crystallization temperatures tend to have a larger difference in the opening dimensions (i.e., larger opening dimensions).
  • Figure 8 shows the relationship between the melt flow rate (one of the indicators of melt viscosity) and the crystallization temperature in a resin composition in which carbon black is added to a thermoplastic urethane elastomer, which is a thermoplastic resin of the same grade but different melt viscosity.
  • the melt flow rate is the value measured using a melt indexer to measure the mass of resin that flows out in 10 minutes when a certain load is applied to molten resin at a certain temperature, and the measurement conditions were a load of 10 kg and a temperature of 200°C.
  • the higher the melt flow rate the easier it is to flow (i.e., the lower the melt viscosity).
  • the melt viscosity of the thermoplastic resin used is different, the crystallization temperature of the resin composition will be different, resulting in differences in the opening dimensions of the molded product.
  • the resin composition contains a crystallization retarder in an amount sufficient to suppress the increase in crystallization temperature caused by the pigment.
  • the mass ratio of nigrosine to carbon black is set to 0.15 or more, so that the crystallization temperature of the resin composition can be made equivalent to the crystallization temperature of the thermoplastic polyurethane elastomer, which is the thermoplastic resin (for example, the temperature difference between them is 5°C or less).
  • the mass ratio of nigrosine to carbon black is preferably 0.16 or more, and more preferably 0.165 or more.
  • Pigments other than carbon black also have the same effect of increasing the crystallization temperature of the resin composition, so adding a crystallization retarder can suppress the rise in the crystallization temperature of the resin composition. It is preferable for such a crystallization retarder to contain nigrosine, as this has a high effect of suppressing the rise in the crystallization temperature.
  • the manufacturing method of the escalator handrail according to the present embodiment can include a removal step of removing the cooled and solidified molded product.
  • the removal step the cooled and solidified molded product is driven by a take-up drive unit 262 and taken up by a take-up reel 264.
  • the escalator handrail 10 includes a resin composition 12 containing a thermoplastic resin, a pigment, and a crystallization retarder, a metal steel wire 14, and a canvas 16.
  • the thermoplastic resin is a polyurethane elastomer.
  • the pigment contains carbon black.
  • the crystallization retarder contains nigrosine.
  • the mass ratio of nigrosine to carbon black is 0.15 or more.
  • the escalator handrail 10 according to the present embodiment includes a pigment and a crystallization retarder in the resin composition, so that the crystallization retarder can suppress the increase in the crystallization temperature of the resin composition due to the pigment, and therefore the precision of the opening dimensions is high.
  • the escalator handrail 10 includes a thermoplastic polyurethane elastomer in the resin composition, the pigment contains carbon black, the crystallization retarder contains nigrosine, and the mass ratio of nigrosine to carbon black is 0.15 or more, so that the crystallization temperature of the resin composition and the crystallization temperature of the thermoplastic resin are equivalent (for example, the temperature difference between them is 5° C. or less), and the precision of the opening dimensions is high.
  • the mass ratio of nigrosine to carbon black is preferably 0.15 or more.
  • thermoplastic polyether urethane elastomer having a hardness of 80 to 95, a tensile strength of 40 to 50 MPa, and an elongation of about 500 to 700% is used.
  • the carbon black has an average particle size of 25 to 35 nm, a specific surface area of 70 to 85 (m 2 /g), and a DBP absorption of about 75 to 102 (ml/100g).
  • the carbon black is added as a master batch containing 10 mass % of carbon black to the thermoplastic polyether urethane elastomer.
  • thermoplastic polyether urethane elastomer The proportions of thermoplastic polyether urethane elastomer, carbon black, and nigrosine contained in each resin composition are shown in Table 1.
  • the parts by mass of thermoplastic polyether urethane elastomer shown in Table 1 include the thermoplastic polyether urethane elastomer in the master batch.
  • Comparative Example 1 is the thermoplastic resin itself to which no pigment or crystallization retardant was added
  • Comparative Example 2 is the thermoplastic resin to which only a pigment was added
  • Comparative Example 3 is the thermoplastic resin to which a pigment and a crystallization retardant (0.125 times the pigment) were added
  • Example 1 is the thermoplastic resin to which a pigment and a crystallization retardant (0.165 times the pigment) were added
  • Example 2 is the thermoplastic resin to which a pigment and a crystallization retardant (0.25 times the pigment) were added.
  • the temperature difference in crystallization temperature refers to the temperature difference between the crystallization temperature of the resin composition of each Example or Comparative Example and the crystallization temperature of the resin composition of Comparative Example 1 (i.e., the thermoplastic polyether urethane elastomer itself).
  • the resin composition was a thermoplastic polyether urethane elastomer itself to which neither carbon black nor nigrosine was added, so the precision of the opening dimensions was good.
  • Comparative Example 2 only carbon black was added to the resin composition, so the crystallization temperature of the resin composition was 26.6°C higher than that in Comparative Example 1, and the precision of the opening dimensions was also poor.
  • Comparative Example 3 carbon black and nigrosine were added to the resin composition, but the amount of nigrosine added was 0.125 times that of carbon black, so the crystallization temperature of the resin composition was 13.2°C higher than that in Comparative Example 1, and the precision of the opening dimensions was also poor.
  • Example 1 carbon black and nigrosine were added to the resin composition, and the amount of nigrosine added was 0.165 times that of carbon black, so the temperature difference between the crystallization temperature of the resin composition and that in Comparative Example 1 was 0.2°C, and the precision of the opening dimensions was good.
  • Example 2 carbon black and nigrosine were added to the resin composition, and the amount of nigrosine added was 0.165 times that of carbon black, so the crystallization temperature of the resin composition differed from the crystallization temperature in Comparative Example 1 by 0.2°C, and the precision of the opening dimensions was good.
  • the crystallization temperature of the resin composition is equivalent to the crystallization temperature of the thermoplastic resin (i.e., the thermoplastic polyether urethane elastomer itself) (for example, the temperature difference between their crystallization temperatures is 5°C or less). From the above results, it was found that in order to make the temperature difference in the crystallization temperatures 5°C or less, the amount of nigrosine added should be 0.15 times or more, preferably 0.16 times or more, and more preferably 0.165 times or more, the amount of carbon black.
  • nigrosine is more expensive than carbon black, the smaller the amount of nigrosine added, the better. From this perspective, it is preferable for the amount of nigrosine added to be 0.25 times or less that of carbon black.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de production d'une main courante mobile pour un escalier mécanique qui comprend : une étape de moulage pour combiner et mouler une composition de résine contenant une résine thermoplastique, un pigment et un retardateur de cristallisation avec un fil d'acier métallique et une toile pour obtenir un article moulé en forme de main courante ; et une étape de refroidissement et de solidification pour refroidir l'article moulé tout en maintenant la forme de main courante sans mouiller la toile avec un liquide de refroidissement et sans utiliser de partie centrale pour maintenir la forme de main courante. La température de cristallisation de la composition de résine est similaire à la température de cristallisation de la résine thermoplastique.
PCT/JP2023/029741 2023-08-17 2023-08-17 Main courante mobile pour escalier mécanique et son procédé de fabrication Pending WO2025037422A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2023/029741 WO2025037422A1 (fr) 2023-08-17 2023-08-17 Main courante mobile pour escalier mécanique et son procédé de fabrication

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PCT/JP2023/029741 WO2025037422A1 (fr) 2023-08-17 2023-08-17 Main courante mobile pour escalier mécanique et son procédé de fabrication

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010265106A (ja) * 2009-05-18 2010-11-25 Bridgestone Corp エンドレスベルト及び回転搬送体
WO2015046041A1 (fr) * 2013-09-26 2015-04-02 三菱電機株式会社 Main courante d'escalier mécanique et son procédé de fabrication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010265106A (ja) * 2009-05-18 2010-11-25 Bridgestone Corp エンドレスベルト及び回転搬送体
WO2015046041A1 (fr) * 2013-09-26 2015-04-02 三菱電機株式会社 Main courante d'escalier mécanique et son procédé de fabrication

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