EP2772119A1 - Ultraviolet ray radiation apparatus and method for curing photo-curable composition - Google Patents

Ultraviolet ray radiation apparatus and method for curing photo-curable composition

Info

Publication number
EP2772119A1
EP2772119A1 EP12799323.6A EP12799323A EP2772119A1 EP 2772119 A1 EP2772119 A1 EP 2772119A1 EP 12799323 A EP12799323 A EP 12799323A EP 2772119 A1 EP2772119 A1 EP 2772119A1
Authority
EP
European Patent Office
Prior art keywords
ultraviolet ray
emitting portion
light
photo
ultraviolet
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.)
Withdrawn
Application number
EP12799323.6A
Other languages
German (de)
French (fr)
Inventor
Shohta SATO
Keigo Sugimura
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.)
Yazaki Corp
Original Assignee
Yazaki 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 Yazaki Corp filed Critical Yazaki Corp
Publication of EP2772119A1 publication Critical patent/EP2772119A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating

Definitions

  • the invention relates to a method for curing a photo-curable composition such as a marking agent or a coating agent, and an apparatus for curing the photo-curable composition.
  • a photo-curable composition such as a marking agent or a coating agent
  • the marking agent is applied onto an insulated electrical wire to so as to determine the type of the insulated electrical wire
  • the coating agent is applied onto the insulated electrical wire so as to protect a marking produced from the marking agent applied.
  • insulated electrical wires suited for use in a vehicle, including a relative huge insulated electrical wire suited for supplying electric power to a device, and an insulated electrical wire suited for the delivery of relatively weak signal.
  • the marking and coating generally need durability in order not to be removed during the use.
  • curable composition can be used, and photo-curable composition which does not need heating treatment and is rapidly cured is particularly desired.
  • JP H8-291969 (A) discloses curing such a curable composition.
  • a photo-curable composition applied onto the entire outer periphery of a cylindrical member is cured at one time.
  • a plurality of light-emitting means i.e., a plurality of ultraviolet lamps
  • a plurality of ultraviolet lamps which is used for curing the outer periphery of the cylindrical member is disposed coaxially with the cylindrical member.
  • the invention is to provide for an ultraviolet ray irradiation apparatus which is inexpensive and space-saving, as well as, a method for curing a photo-curable composition by using the inventive ultraviolet ray irradiation apparatus.
  • the invention provides an ultraviolet ray irradiation apparatus, which includes an ultraviolet ray-emitting portion configured to irradiate ultraviolet lay in a single direction; and a light-collecting reflector disposed apart from the ultraviolet ray-emitting portion, and opposed to the ultraviolet ray-emitting portion such that it can reflect ultraviolet lay emitted from the ultraviolet ray-emitting portion to direct the ultraviolet lay reflected from the light-collecting reflector to a location or space between the ultraviolet ray-emitting portion and the light-collecting reflector (Point 1).
  • the light-collecting reflector is spherically or cylindrically-shaped concave reflector, or includes a plurality of plate-shaped reflective members (Point 2).
  • the ultraviolet ray irradiation apparatus further includes a linear material-supplying portion which is configured to continuously supply a linear material between the ultraviolet ray-emitting portion and the light-collecting reflector (Point 3).
  • the invention provides a method for curing a photo-curable composition.
  • the method includes the step of curing the photo-curable composition applied onto a linear material by using an ultraviolet ray irradiation apparatus as mentioned previously (Point 4).
  • the photo-curable composition is a photo-curable ink, and/or a photo-curable coating agent (Point 5).
  • the ultraviolet ray emitting apparatus with more simplified structure can be achieved.
  • the photo-curable composition applied onto the surface of the linear material can be continuously cured with ease.
  • the photo-curable composition can be continuously cured with low cost.
  • Fig. 1 is one embodiment of ultraviolet ray irradiation apparatus in accordance with the invention.
  • Fig. 2 is another embodiment of an ultraviolet ray irradiation apparatus in accordance with the invention
  • Fig. 3 is one embodiment of an insulated electrical wire which is obtained by curing a marking agent applied onto a surface of an electrical wire by use of an ultraviolet ray irradiation apparatus in accordance with the invention, and subsequently attaching a terminal to both ends of the insulated electrical wire.
  • Fig 4 depicts a cross section of an exemplary light-collecting reflector.
  • Fig. 5 depicts a dimension or measurement of each portion in one embodiment of ultraviolet ray irradiation apparatus in accordance with the invention.
  • Fig. 1 is one embodiment of ultraviolet ray irradiation apparatus in accordance with the invention.
  • Fig. 1 is a cross sectional view taken along a line or plane perpendicular to the longitudinal direction of an insulated electrical wire to which photo-curable coating composition is applied.
  • a reference numeral 1 represents an ultraviolet ray-emitting portion which is configured to irradiate ultraviolet ray in a single direction.
  • ultraviolet ray is irradiated downward.
  • a source of ultraviolet lay include, but is not limited to, light-emitting diode (i.e., LED), a mercury lamp, a xenon lamp, a metal halide lamp, and the like.
  • the source of ultraviolet lay can be used independently or in combination with a reflector (i.e., a reflective plate) so as to direct or irradiate ultraviolet ray in a single direction.
  • an insulated electrical wire 3 onto which a photo-curable coating composition 4 is applied is located below the ultraviolet ray-emitting portion 1.
  • the insulated electrical wire 3 is continuously moved in its longitudinal direction, and is subjected to continuous ultraviolet ray irradiation.
  • the insulated electrical wire 3 includes a conductor (i.e., a core portion) 3a and an insulating layer 3a disposed over the conductor 3b.
  • the diameter of the emitted ultraviolet ray at the irradiation site or irradiation location of insulated electrical wire 3 is made larger that the diameter of the insulated electrical wire 3.
  • at least a part of the ultraviolet lay emitted from the ultraviolet ray-emitting portion 1 is directed downward to reach a light-collecting reflector 2, which is disposed apart from the ultraviolet ray-emitting portion 1, and is opposed to the ultraviolet ray-emitting portion 1.
  • the light-collecting reflector 2 can be cylindrical or half-round concave reflector with a curved reflective inner surface.
  • the axis of the cylindrical concave reflector corresponds to the longitudinal direction of the insulated electrical wire 3.
  • the ultraviolet ray which directly reaches the light-collecting reflector 2 is reflected at the surface of the light-collecting reflector 2.
  • the ultraviolet ray which is reflected from the surface of the light-collecting reflector 2 is collected or concentrated between the ultraviolet ray-emitting portion 1 and the light-collecting reflector 2.
  • the ultraviolet ray is collected or concentrated in the back side of or underside of the insulated electrical wire 3.
  • the back side or underside of the insulated electrical wire 3 correspond to the side of the insulated electrical wire 3 away from the ultraviolet ray-emitting portion 1. Accordingly, the ultraviolet ray can reach the entire periphery of the insulated electrical wire 3. Regardless of a site or location of the photo-curable coating composition 4 applied onto the surface of the insulated electrical wire 3, the photo-curable coating composition 4 applied can be securely cured by using the embodiment of the ultraviolet ray irradiation apparatus in accordance with the invention.
  • a cylindrical concave reflector is used as the light-collecting reflector 2.
  • the light-collecting reflector 1 may be alternatively used if it can reflect the ultraviolet ray emitted from the ultraviolet ray-emitting portion 1 to direct the reflected ultraviolet ray between the ultraviolet ray-emitting portion 1 and the light-collecting reflector.
  • the light-collecting reflector can be consisted of a plurality of plate-shaped reflective members.
  • two plate-shaped reflective members 2 ⁇ are arranged so as to form a structure similar to the above cylindrical concave reflector.
  • the light-collecting reflector may be spherically- or cylindrically-shaped concave reflector, or may include a plurality of plate-shaped reflective members.
  • the material which can be employed for the light-collecting reflector includes, but is not limited to, aluminum, aluminum alloy, or the like.
  • the material may further include an additive agent such as borosilicate glass, quartz or the like for corrosion prevention.
  • the insulated electrical wire may be a general or known insulated electrical wire which can be used in any applications in which marking is needed.
  • the ultraviolet ray irradiation apparatus as shown in Figs. 1 and 2 can be preferably used in combination with a linear material-supplying portion or unit configured to continuously supply the insulated electrical wire to the ultraviolet ray irradiation apparatus, and/or an application portion or unit configured to apply the marking agent and/or the coating agent to, for example, the desired area of the insulated electrical wire.
  • the linear material-supplying portion is capable of continuously supplying a linear material such as an insulated electrical wire between the ultraviolet ray-emitting portion and the light-collecting reflector.
  • the linear material-supplying portion may include a reel-retaining portion configured to rotatably retain a reel on which the insulated electrical wire is wound, a guiding portion configured to guide the cured insulated electrical wire to a location or site for curing, and a wind-up portion configured to wind up the cured insulated electrical wire thereon.
  • the application portion which is configured to apply the marking agent or coating agent onto the insulated electrical wire may be disposed in a longitudinal direction and located upstream of the insulated electrical wire. As such, a series of the steps or processes can be efficiently performed.
  • a material which can be employed for the making agent may be a photo-curable ink which may include, for example, photo-polymerization initiator, thermoplastic resin, colorant (dye and/or pigment), and optionally a solvent as needed.
  • the marking agent can be selected such that the viscosity of the marking agent is suitable for an intended application or use.
  • the coating agent may be photo-curable coating agent.
  • the composition of the coating agent may be similar to the composition of the marking agent excluding that a colorant(s) is not used.
  • the application of the photo-curable composition can be carried out in accordance with a general, known method.
  • the marking agent can be applied in accordance with an ink-jet method, a stamping method or the like
  • the coating agent can be applied in accordance with an ink-jet method, a dipping method, a stamping method or the like.
  • Fig. 3 shows one example of the insulated electrical wire which is obtained by curing the marking agent applied onto the insulated electrical wire by use of the inventive ultraviolet lay irradiation apparatus, and subsequently attaching terminal to both end of the insulated electrical wire.
  • a reference number 3 represents an insulated electrical wire; a reference number 4 represents a (cured) marking obtained by curing the photo-curable composition; and a reference number 5 represents a connecting terminal.
  • composition of the marking agent i.e., ink
  • Table 1 The composition of the marking agent (i.e., ink) is summarized in Table 1 as listed below.
  • An ultraviolet ray emitting unit obtained from Shoudensha Corporation was used as the ultraviolet ray-emitting portion.
  • Four types of concave mirrors i.e., concave spherical mirror, which were obtained from Sigma Koki Co., Ltd. and formed of aluminum, were used as the light-collecting reflector. The details of the mirrors are summarized in Table 2 as listed below, and each dimension is depicted in Fig. 4 attached hereto.
  • An insulated electrical wire having an outer diameter of 3.1 mm was used in the experimentation. Ink was applied onto the surface of the insulated electrical wire at an angle of 0 degree and 180 degrees with respect to the surface of the insulated electrical wire. The applied area was 3.3 mm x 5 mm. The ink was applied onto the insulated electrical wire such that it ranges at an extent of 240 degree in a circumferential direction of the insulated electrical wire. Subsequently, ultraviolet ray irradiation (i.e., experimentation) was carried out while retaining the applied area or site of above 0 degree approximately opposed to the ultraviolet ray-emitting portion.
  • ultraviolet ray irradiation i.e., experimentation
  • Fig. 5 shows one example of determining a distance between the insulated electrical wire and the ultraviolet ray-emitting portion (alpha), and a distance between the insulated electrical wire and the reflector (beta).
  • Table 3 shows specific conditions for the reflectors used when the irradiation time is 0.6 seconds.
  • Table 4 shows specific conditions for determining the effect of the distance between the insulated electrical wire and the ultraviolet ray-emitting portion (alpha) when the irradiation time is 0.6 seconds.
  • Table 5 shows specific conditions for determining the effect of the irradiation time.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Coating Apparatus (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

The invention is directed to an ultraviolet ray irradiation apparatus, which includes an ultraviolet ray-emitting portion configured to irradiate ultraviolet lay in a single direction; and a light-collecting reflector disposed apart from the ultraviolet ray-emitting portion, and opposed to the ultraviolet ray-emitting portion. The light-collecting reflector can reflect ultraviolet lay emitted from the ultraviolet ray-emitting portion to direct the ultraviolet lay reflected from the light-collecting reflector to a location or space between the ultraviolet ray-emitting portion and the light-collecting reflector.

Description

    ULTRAVIOLET RAY RADIATION APPARATUS AND METHOD FOR CURING PHOTO-CURABLE COMPOSITION
  • The invention relates to a method for curing a photo-curable composition such as a marking agent or a coating agent, and an apparatus for curing the photo-curable composition. For reference, the marking agent is applied onto an insulated electrical wire to so as to determine the type of the insulated electrical wire, and the coating agent is applied onto the insulated electrical wire so as to protect a marking produced from the marking agent applied.
  • There are a wide variety of insulated electrical wires suited for use in a vehicle, including a relative huge insulated electrical wire suited for supplying electric power to a device, and an insulated electrical wire suited for the delivery of relatively weak signal.
  • In order to determine or discriminate the types of insulated electrical wires, there has been proposed an approach that a marking having a variety of sizes or colors is applied onto the surface of the insulated electrical wire, and a protective coating is also applied onto the marking.
  • In this case, the marking and coating generally need durability in order not to be removed during the use. For this purpose, curable composition can be used, and photo-curable composition which does not need heating treatment and is rapidly cured is particularly desired.
  • For reference, JP H8-291969 (A) discloses curing such a curable composition.
  • In accordance with JP H8-291969 (A), a photo-curable composition applied onto the entire outer periphery of a cylindrical member is cured at one time. For more detail, a plurality of light-emitting means (i.e., a plurality of ultraviolet lamps) which is used for curing the outer periphery of the cylindrical member is disposed coaxially with the cylindrical member.
  • However, the above technologies are not suited to downsize an apparatus used, and are also cost-consuming job due to the use of the plurality of light-emitting means (i.e., ultraviolet lamps).
  • JP H8-291969 (A)
  • In view of the above, the invention is to provide for an ultraviolet ray irradiation apparatus which is inexpensive and space-saving, as well as, a method for curing a photo-curable composition by using the inventive ultraviolet ray irradiation apparatus.
  • In one aspect, the invention provides an ultraviolet ray irradiation apparatus, which includes an ultraviolet ray-emitting portion configured to irradiate ultraviolet lay in a single direction; and a light-collecting reflector disposed apart from the ultraviolet ray-emitting portion, and opposed to the ultraviolet ray-emitting portion such that it can reflect ultraviolet lay emitted from the ultraviolet ray-emitting portion to direct the ultraviolet lay reflected from the light-collecting reflector to a location or space between the ultraviolet ray-emitting portion and the light-collecting reflector (Point 1).
  • Preferably, the light-collecting reflector is spherically or cylindrically-shaped concave reflector, or includes a plurality of plate-shaped reflective members (Point 2).
  • Preferably, the ultraviolet ray irradiation apparatus further includes a linear material-supplying portion which is configured to continuously supply a linear material between the ultraviolet ray-emitting portion and the light-collecting reflector (Point 3).
  • In another aspect, the invention provides a method for curing a photo-curable composition. The method includes the step of curing the photo-curable composition applied onto a linear material by using an ultraviolet ray irradiation apparatus as mentioned previously (Point 4).
  • Preferably, the photo-curable composition is a photo-curable ink, and/or a photo-curable coating agent (Point 5).
  • In accordance with Point 1, there can be achieved inexpensive and space-saving ultraviolet ray irradiation apparatus.
  • In accordance with Point 2, the ultraviolet ray emitting apparatus with more simplified structure can be achieved.
  • In accordance with Point 3, the photo-curable composition applied onto the surface of the linear material can be continuously cured with ease.
  • In accordance with Points 4 and 5, the photo-curable composition can be continuously cured with low cost.
  • Fig. 1 is one embodiment of ultraviolet ray irradiation apparatus in accordance with the invention. Fig. 2 is another embodiment of an ultraviolet ray irradiation apparatus in accordance with the invention Fig. 3 is one embodiment of an insulated electrical wire which is obtained by curing a marking agent applied onto a surface of an electrical wire by use of an ultraviolet ray irradiation apparatus in accordance with the invention, and subsequently attaching a terminal to both ends of the insulated electrical wire. Fig 4 depicts a cross section of an exemplary light-collecting reflector. Fig. 5 depicts a dimension or measurement of each portion in one embodiment of ultraviolet ray irradiation apparatus in accordance with the invention.
  • While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. Fig. 1 is one embodiment of ultraviolet ray irradiation apparatus in accordance with the invention. Fig. 1 is a cross sectional view taken along a line or plane perpendicular to the longitudinal direction of an insulated electrical wire to which photo-curable coating composition is applied.
  • With reference to Fig. 1, a reference numeral 1 represents an ultraviolet ray-emitting portion which is configured to irradiate ultraviolet ray in a single direction. In Fig. 1, ultraviolet ray is irradiated downward. A source of ultraviolet lay include, but is not limited to, light-emitting diode (i.e., LED), a mercury lamp, a xenon lamp, a metal halide lamp, and the like. The source of ultraviolet lay can be used independently or in combination with a reflector (i.e., a reflective plate) so as to direct or irradiate ultraviolet ray in a single direction.
  • Referring to Fig. 1, an insulated electrical wire 3 onto which a photo-curable coating composition 4 is applied is located below the ultraviolet ray-emitting portion 1. The insulated electrical wire 3 is continuously moved in its longitudinal direction, and is subjected to continuous ultraviolet ray irradiation. The insulated electrical wire 3 includes a conductor (i.e., a core portion) 3a and an insulating layer 3a disposed over the conductor 3b.
  • In these circumstances, the diameter of the emitted ultraviolet ray at the irradiation site or irradiation location of insulated electrical wire 3 is made larger that the diameter of the insulated electrical wire 3. As a result, at least a part of the ultraviolet lay emitted from the ultraviolet ray-emitting portion 1 is directed downward to reach a light-collecting reflector 2, which is disposed apart from the ultraviolet ray-emitting portion 1, and is opposed to the ultraviolet ray-emitting portion 1.
  • In one embodiment, the light-collecting reflector 2 can be cylindrical or half-round concave reflector with a curved reflective inner surface. Referring to Fig. 1, the axis of the cylindrical concave reflector corresponds to the longitudinal direction of the insulated electrical wire 3. The ultraviolet ray which directly reaches the light-collecting reflector 2 is reflected at the surface of the light-collecting reflector 2. As a result, the ultraviolet ray which is reflected from the surface of the light-collecting reflector 2 is collected or concentrated between the ultraviolet ray-emitting portion 1 and the light-collecting reflector 2. In the illustrated embodiment, the ultraviolet ray is collected or concentrated in the back side of or underside of the insulated electrical wire 3. For reference, the back side or underside of the insulated electrical wire 3 correspond to the side of the insulated electrical wire 3 away from the ultraviolet ray-emitting portion 1. Accordingly, the ultraviolet ray can reach the entire periphery of the insulated electrical wire 3. Regardless of a site or location of the photo-curable coating composition 4 applied onto the surface of the insulated electrical wire 3, the photo-curable coating composition 4 applied can be securely cured by using the embodiment of the ultraviolet ray irradiation apparatus in accordance with the invention.
  • In accordance with the embodiment of the invention (Fig. 1), a cylindrical concave reflector is used as the light-collecting reflector 2. However, other type of the light-collecting reflector 1 may be alternatively used if it can reflect the ultraviolet ray emitted from the ultraviolet ray-emitting portion 1 to direct the reflected ultraviolet ray between the ultraviolet ray-emitting portion 1 and the light-collecting reflector. For example, the light-collecting reflector can be consisted of a plurality of plate-shaped reflective members. With reference to Fig. 2, two plate-shaped reflective members 2` are arranged so as to form a structure similar to the above cylindrical concave reflector. In other words, the light-collecting reflector may be spherically- or cylindrically-shaped concave reflector, or may include a plurality of plate-shaped reflective members.
  • The material which can be employed for the light-collecting reflector includes, but is not limited to, aluminum, aluminum alloy, or the like. The material may further include an additive agent such as borosilicate glass, quartz or the like for corrosion prevention.
  • The insulated electrical wire may be a general or known insulated electrical wire which can be used in any applications in which marking is needed.
  • When a marking agent and/or a coating agent is intended to be applied onto insulated electrical wire, the ultraviolet ray irradiation apparatus as shown in Figs. 1 and 2 can be preferably used in combination with a linear material-supplying portion or unit configured to continuously supply the insulated electrical wire to the ultraviolet ray irradiation apparatus, and/or an application portion or unit configured to apply the marking agent and/or the coating agent to, for example, the desired area of the insulated electrical wire. In one embodiment, the linear material-supplying portion is capable of continuously supplying a linear material such as an insulated electrical wire between the ultraviolet ray-emitting portion and the light-collecting reflector.
  • One embodiment of the linear material-supplying portion may include a reel-retaining portion configured to rotatably retain a reel on which the insulated electrical wire is wound, a guiding portion configured to guide the cured insulated electrical wire to a location or site for curing, and a wind-up portion configured to wind up the cured insulated electrical wire thereon. The application portion which is configured to apply the marking agent or coating agent onto the insulated electrical wire may be disposed in a longitudinal direction and located upstream of the insulated electrical wire. As such, a series of the steps or processes can be efficiently performed.
  • A material which can be employed for the making agent may be a photo-curable ink which may include, for example, photo-polymerization initiator, thermoplastic resin, colorant (dye and/or pigment), and optionally a solvent as needed. The marking agent can be selected such that the viscosity of the marking agent is suitable for an intended application or use.
  • The coating agent may be photo-curable coating agent. In addition, the composition of the coating agent may be similar to the composition of the marking agent excluding that a colorant(s) is not used.
  • The application of the photo-curable composition can be carried out in accordance with a general, known method. For more detail, the marking agent can be applied in accordance with an ink-jet method, a stamping method or the like, and the coating agent can be applied in accordance with an ink-jet method, a dipping method, a stamping method or the like.
  • Fig. 3 shows one example of the insulated electrical wire which is obtained by curing the marking agent applied onto the insulated electrical wire by use of the inventive ultraviolet lay irradiation apparatus, and subsequently attaching terminal to both end of the insulated electrical wire.
  • With reference to Figs. 3(a) to 3(d), a reference number 3 represents an insulated electrical wire; a reference number 4 represents a (cured) marking obtained by curing the photo-curable composition; and a reference number 5 represents a connecting terminal.
  • The invention will be hereinafter described in detail with reference to the following examples. The composition of the marking agent (i.e., ink) is summarized in Table 1 as listed below.
  • An ultraviolet ray emitting unit obtained from Shoudensha Corporation was used as the ultraviolet ray-emitting portion. Four types of concave mirrors (i.e., concave spherical mirror), which were obtained from Sigma Koki Co., Ltd. and formed of aluminum, were used as the light-collecting reflector. The details of the mirrors are summarized in Table 2 as listed below, and each dimension is depicted in Fig. 4 attached hereto.
  • An insulated electrical wire having an outer diameter of 3.1 mm was used in the experimentation. Ink was applied onto the surface of the insulated electrical wire at an angle of 0 degree and 180 degrees with respect to the surface of the insulated electrical wire. The applied area was 3.3 mm x 5 mm. The ink was applied onto the insulated electrical wire such that it ranges at an extent of 240 degree in a circumferential direction of the insulated electrical wire. Subsequently, ultraviolet ray irradiation (i.e., experimentation) was carried out while retaining the applied area or site of above 0 degree approximately opposed to the ultraviolet ray-emitting portion.
  • Fig. 5 shows one example of determining a distance between the insulated electrical wire and the ultraviolet ray-emitting portion (alpha), and a distance between the insulated electrical wire and the reflector (beta).
  • Table 3 shows specific conditions for the reflectors used when the irradiation time is 0.6 seconds. Table 4 shows specific conditions for determining the effect of the distance between the insulated electrical wire and the ultraviolet ray-emitting portion (alpha) when the irradiation time is 0.6 seconds. Table 5 shows specific conditions for determining the effect of the irradiation time.
  • Results of the experimentation
    Satisfactory results (i.e., curing) was obtained when the distance (alpha) between the insulated electrical wire and the ultraviolet ray-emitting portion was 12 mm, the distance (beta) between the insulated electrical wire and the reflector (i.e., light-collecting reflector) was 9 mm, and the irradiation time is 10 seconds.
  • 1 Ultraviolet ray-emitting portion
    2 Light-collecting reflector
    3 Insulated electrical wire

Claims (5)

  1. An ultraviolet ray irradiation apparatus, comprising:
    an ultraviolet ray-emitting portion configured to irradiate ultraviolet lay in a single direction; and
    a light-collecting reflector disposed apart from the ultraviolet ray-emitting portion, and opposed to the ultraviolet ray-emitting portion such that it can reflect ultraviolet lay emitted from the ultraviolet ray-emitting portion to direct the ultraviolet lay reflected from the light-collecting reflector toward a location or space between the ultraviolet ray-emitting portion and the light-collecting reflector.
  2. The ultraviolet ray irradiation apparatus according to claim 1, wherein the light-collecting reflector is spherically or cylindrically-shaped concave reflector, or comprises a plurality of plate-shaped reflective members.
  3. The ultraviolet ray irradiation apparatus according to claim 1 or 2, further including a linear material-supplying portion configured to continuously supply a linear material between the ultraviolet ray-emitting portion and the light-collecting reflector.
  4. A method for curing a photo-curable composition, comprising the step of curing the photo-curable composition applied onto a linear material by using an ultraviolet ray irradiation apparatus according to any of claims 1-3.
  5. The method according to claim 4, wherein the photo-curable composition is a photo-curable marking agent and/or a photo-curable coating agent.
EP12799323.6A 2011-10-26 2012-10-23 Ultraviolet ray radiation apparatus and method for curing photo-curable composition Withdrawn EP2772119A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011235042A JP5928868B2 (en) 2011-10-26 2011-10-26 Ultraviolet irradiation device and photocurable coating material curing treatment method
PCT/JP2012/006770 WO2013061573A1 (en) 2011-10-26 2012-10-23 Ultraviolet ray radiation apparatus and method for curing photo-curable composition

Publications (1)

Publication Number Publication Date
EP2772119A1 true EP2772119A1 (en) 2014-09-03

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JP (1) JP5928868B2 (en)
CN (1) CN104012171A (en)
MX (1) MX2014005034A (en)
PH (1) PH12014500929A1 (en)
WO (1) WO2013061573A1 (en)

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MX2014005034A (en) 2015-02-10
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JP5928868B2 (en) 2016-06-01
CN104012171A (en) 2014-08-27
PH12014500929A1 (en) 2014-06-09

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