JP2000094444A - Decoration pretreatment method for irregular curved surface and treatment device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel decoration pretreatment method and apparatus therefor which improve adhesion of coating and a coating film by uniformly applying ultraviolet rays on a surface in a pre-stage of decoration such as painting or printing to a resin molding product having an irregular curved surface and molded to a relatively large size. SOLUTION: This decoration pretreatment apparatus 1 comprises a light source unit 41 for applying ultraviolet rays, and an irradiating chamber 3 equipped with the light source unit 41, wherein before decorating a work W, the light source unit 41 applies rays to the work W set in the fixed state while being transferred along the surface, and the transfer is kept in the state where the irradiation distance and the transferring speed are substantially constant, and the irradiation is directed from the normal direction of a portion to be irradiated in the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretreatment for applying cosmetics such as painting and printing to the surface of a resin molded product, and more particularly to a resin molded product having an irregularly shaped surface and a relatively large size. The present invention relates to a novel cosmetic pretreatment method capable of dramatically improving the adhesion of paints and coatings by uniformly irradiating the surface with ultraviolet rays even when molded.

[0002]

BACKGROUND OF THE INVENTION For example, with respect to automotive components, bumpers are:
It is molded as a relatively large molded product using polycarbonate (PC), acrylonitrile butadiene styrene resin (ABS resin), or the like. There is a movement to apply surface makeup such as painting and printing to these molded products. These new members include polycarbonate (PC), polybutylene terephthalate (PBT) or polycarbonate / polybutylene terephthalate (PC / PB).
T), etc., are often molded from resin materials, but many of these resin materials, including these, originally have poor adhesion of paints and coatings, and the adhesion of paints and coatings has been low. For a molded product using a poor resin material, pretreatment such as irradiation with ultraviolet rays has been generalized.

However, when a molded product, ie, a work, constitutes the body of an automobile as described above, the molded product is formed into a relatively large size, and in addition, an irregular surface having different radii of curvature at various portions of the product. In some cases, it is difficult to uniformly irradiate the surface with ultraviolet rays, and in some cases, there is a problem that poor makeup occurs.
That is, in the conventional irradiation mode, while irradiating ultraviolet rays from the upper and side portions of the irradiation chamber usually formed in a tunnel shape,
Since the work was sunk into the tunnel-shaped irradiation chamber, the work had an irregular surface, and in the case of a relatively large-sized work, etc., the irradiation distance and the irradiation angle could not always be kept constant. In some cases, it is difficult to perform uniform irradiation as a whole.

[0004] In particular, recently, when the design elements include complicated patterns, gradations, and the like in accordance with diversification of user preferences, the above-mentioned problems have become more prominent. In other words, in order to respond to such design requirements at a reasonable cost, there is not much manual painting done,
Curved surface printing with automated equipment is suitable. Although this method has already been put to practical use in many fields, it is a complicated method because a transfer film on which a design pattern is printed is suspended in a transfer tank, a work is pressed against the transfer tank, and the work is transferred by hydraulic pressure. In a curved surface or a part where liquid pressure is not easily applied, it is difficult to adhere the transfer ink. For this reason, in this type of hydraulic transfer method, the pretreatment such as the above-described ultraviolet irradiation is performed on the work with the aim of improving the adhesion of the transfer ink.
However, in the case where the work surface forms a complicated three-dimensional shape as described above, there is a portion that is hardly irradiated by a simple irradiation tunnel, that is, a portion where transfer ink is hardly adhered. It was necessary to take measures to ensure that the pre-processing was widespread.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and has been developed for coating and molding a relatively large-sized resin molded product having an irregular surface. Attempts to develop a new cosmetic pretreatment method that can dramatically improve the adhesion of paints and coatings by uniformly irradiating the surface with ultraviolet light before applying makeup such as printing. .

[0006]

According to a first aspect of the present invention, there is provided a method for pre-dressing an irregularly-shaped workpiece, wherein the workpiece is formed from an appropriate resin material so as to have an irregularly-shaped surface.
Prior to performing makeup, in the method of performing pretreatment by ultraviolet irradiation, the ultraviolet irradiation maintains an irradiation distance between a light source unit that irradiates ultraviolet light and a work within an appropriate range, and relatively moves at an appropriate speed. It is characterized in that it is performed while being performed. According to the present invention, the irradiation distance is maintained within an appropriate range during the irradiation of the ultraviolet light, so that even if the work has an irregularly shaped surface and is formed into a relatively large size, the irradiation of the work surface with the ultraviolet light is uniform. Can be done. Further, not only a form in which the work is fixed and the light source unit is moved, but also various irradiation forms such as a form in which the light source unit is fixed and the work is moved can be adopted.

According to a second aspect of the present invention, in addition to the requirement of the first aspect, the ultraviolet irradiation is performed such that a light source unit is applied to the surface of the work set in a fixed state. While moving along, the movement is performed while the irradiation distance and the moving speed are maintained substantially constant. ADVANTAGE OF THE INVENTION According to this invention, the specific structure which irradiates an ultraviolet-ray uniformly to the workpiece surface is enabled.

According to a third aspect of the present invention, in addition to the requirement of the first aspect, the ultraviolet irradiation is performed by irradiating the work with a light source unit set in a fixed state. It is characterized by being carried out while originally moving, and being carried out with the irradiation distance and the irradiation speed being maintained substantially constant. ADVANTAGE OF THE INVENTION According to this invention, the specific structure which irradiates an ultraviolet-ray uniformly to the workpiece surface is enabled.

According to a fourth aspect of the present invention, in addition to the requirement of the first, second or third aspect, the ultraviolet rays are irradiated from a normal direction of an irradiation section of the work. It is characterized by the following.
According to the present invention, the irradiation distance between the light source unit and the work is maintained, and the irradiation is performed from the substantially normal direction of the irradiation surface, so that more uniform pretreatment irradiation can be performed.

A makeup pre-treatment method for an irregularly curved surface workpiece according to a fifth aspect is characterized in that, in addition to the requirements according to the first, second, third or fourth aspect, the makeup is hydraulic transfer. It is. According to the present invention, a complicated transfer pattern can be more stably printed even on a work that forms a complicated three-dimensional curved surface.

According to a sixth aspect of the present invention, there is provided an apparatus for pre-dressing a work having an irregular surface, wherein the work is performed on a work formed from an appropriate resin material so as to have an irregular surface.
An apparatus for irradiating a work with ultraviolet light at a stage before makeup, comprising a light source unit for irradiating ultraviolet light and an irradiation chamber for installing the light source unit, wherein the light source unit maintains an irradiation distance with the work within an appropriate range. And irradiates the work while relatively moving at an appropriate speed. According to the present invention, the irradiation distance is maintained within an appropriate range during the irradiation of the ultraviolet light, so that even if the work has an irregularly shaped surface and is formed into a relatively large size, the irradiation of the work surface with the ultraviolet light is uniform. Can be done. Further, not only a form in which the work is fixed and the light source unit is moved, but also various irradiation forms such as a form in which the light source unit is fixed and the work is moved can be adopted.

[0012] According to a seventh aspect of the present invention, in addition to the requirement of the sixth aspect, the makeup pretreatment apparatus for the workpiece having an irregular surface has a structure in which the light source unit emits ultraviolet light while moving along the surface of the workpiece set in a fixed state. And the movement is performed while the irradiation distance and the movement speed are maintained substantially constant. ADVANTAGE OF THE INVENTION According to this invention, the specific structure which irradiates an ultraviolet-ray uniformly to the workpiece surface is enabled.

According to the present invention, in addition to the requirements described in the sixth aspect, the makeup pretreatment apparatus for an irregularly curved surface workpiece may be moved three-dimensionally with respect to the light source unit set in a fixed state. While being irradiated with ultraviolet rays, the movement is performed while the irradiation distance and the irradiation speed are maintained substantially constant. ADVANTAGE OF THE INVENTION According to this invention, the specific structure which irradiates an ultraviolet-ray uniformly to the workpiece surface is enabled.

According to a ninth aspect of the present invention, in addition to the requirements of the sixth, seventh, or eighth aspect, the ultraviolet ray is radiated from a normal direction of an irradiation portion of the workpiece. It is characterized by the following.
According to the present invention, the irradiation distance between the light source unit and the work is maintained, and the irradiation is performed from the substantially normal direction of the irradiation surface, so that more uniform pretreatment irradiation can be performed.

According to a tenth aspect of the present invention, in addition to the requirement of the sixth, seventh, eighth, or ninth aspect, the makeup is a hydraulic transfer. It is. According to the present invention, a complicated transfer pattern can be more stably printed even on a work that forms a complicated three-dimensional curved surface.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the description, the makeup pre-processing apparatus 1 for performing the makeup pre-processing method for the work having an indeterminate curved surface will be described first, and then the makeup pre-processing method will be described together with the operation mode of the apparatus. The makeup pre-treatment device 1 is provided with a work W formed from an appropriate resin material, in order to improve the adhesiveness of a paint or a coating film before performing makeup such as painting or printing on the surface of the work W. Irradiates ultraviolet rays. As an example, as shown in FIG. 1, this apparatus includes a conveying apparatus 2 connected from a pre-treatment apparatus 1 to a makeup process, an irradiation chamber 3 where ultraviolet irradiation is performed, and an irradiation apparatus for substantially irradiating ultraviolet light. And a device 4. For the workpiece W to be processed by the present invention, a relatively large molded product having a complicated indefinite curved surface having different radii of curvature at various parts such as a front fender, a rear fender or a front bumper of an automobile is suitable. However, it is needless to say that the curvature radius may be stable on the surface of the work, or the work W itself may be relatively small. As molding materials, polycarbonate (PC), polybutylene terephthalate (PBT), polycarbonate /
Polybutylene terephthalate (PC / PBT), acrylonitrile butadiene styrene resin (ABS resin), nylon and the like are applied. Hereinafter, each component will be described.

First, the transfer device 2 will be described. This conveys the work W from the pre-processing step to the makeup step, and as an example, a hanger conveyor 21 provided to connect each step as shown in FIGS.
It comprises a work holding member 22 for holding the work W, and a hook member 23 provided below the hanger conveyor 21 and hooking the work holding member 22. The hanger conveyor 21 includes a rail 24 laid above each step and wheels 25 rolling on the rail 24.

The work holding member 22 has a holding portion 27 formed at an appropriate position with respect to a frame 26 formed in a rectangular frame shape. In this case, for example, if the work W is previously formed with a mounting hole Wh or the like for a vehicle body or the like, a configuration in which the holding portion 27 is fitted into the mounting hole Wh to hold the work W is possible. Since the frame body 26 is formed exclusively for each work W having a different shape,
A shape detection plate 28 for performing an irradiation operation in accordance with a different surface shape for each of the held works W is provided. In this example, as shown in FIGS. 2 and 3, as an example, a detection hole 28a is formed in an appropriate position pattern for each work W having a different surface shape, and this opening position pattern is formed by a photoelectric tube, a proximity switch, or the like. It is sensed and different surface shapes are recognized. In FIG. 2, two detection holes 28a are formed in the center of the shape detection plate 28 for the work W positioned on the transport direction advancing side, and the shape detection plate is formed for the work W positioned on the other rear side. Detection holes 28a are formed at both ends of the hole 28.

As an example, a plurality of hook members 23 are provided below the wheels 25 so as to have an appropriate interval. Each of the hook members 23 is formed in a plane, and the frame member 26 of the work holding member 22 is formed. Hook-shaped hook 2
9. The transport device 2 can adopt not only a mode in which the work W is suspended and transported as described above, but also, for example, a mode in which the workpiece W is mounted on a roller conveyor and transported.

Next, the irradiation chamber 3 will be described. This is a part for irradiating the conveyed work W with ultraviolet rays on its decorative surface. As an example, as shown in FIG. 1, a substantial irradiation space 31, a shutter 32, and an exhaust duct 3 are provided.
3 is provided. The irradiation chamber 3 is formed by bending a substantial irradiation space 31, that is, a portion where the irradiation device 4 is disposed, in a key shape in order to prevent direct leakage of ultraviolet rays from the irradiation chamber 3. , Shutter 3
2 is provided, and the inside is closed. Further, the inner wall of the irradiation chamber 3 is coated with black to prevent leakage due to irregular reflection of ultraviolet rays. The exhaust duct 33 exhausts ozone generated by ultraviolet rays. In this embodiment, the irradiation chamber 3 is formed in a closed state by the shutter 32 or the like, but the irradiation chamber 3 does not necessarily need to be formed in a closed state.

Next, the irradiation device 4 will be described. This device comprises a light source unit 41 for irradiating ultraviolet rays, and a multi-joint type manipulator 42 for holding the light source unit 41 at the tip and moving it freely along the surface of the work. The light source unit 41 includes, for example, a mercury lamp 43 as a light source and a mercury lamp 43 as shown in FIG.
The reflector 44 includes a reflector 44 for reflecting light emitted from the substrate toward the work W, and a quartz glass 45 for transmitting only ultraviolet rays. In this embodiment, a high-pressure mercury lamp is applied to the mercury lamp 43 for the purpose of obtaining the maximum ultraviolet energy, and the light emitted radially from the mercury lamp 43 is almost one point (focus) to the reflector 44.
An elliptical parabolic shape that can be focused on is applied,
In addition, a low-pressure mercury lamp or the like may be used as a light source, and a reflector that reflects radially emitted light as parallel rays may be used as the reflector 44. The light source unit 41 cools by blowing filtered air from the back of the reflector 44 during the irradiation of ultraviolet rays.

The manipulator 42 includes, as an example, a base 46 horizontally installed as shown in FIG.
6 and an arm 48 connected to the support 47 and holding the light source unit 41 at the other end. If the three axes orthogonal to each other, that is, the X axis, the Y axis, and the Z axis are set as shown in the drawing, the above-described members of the base part 46, the support part 47, and the arm part 48 are rotatable as a whole in three axis directions. With this configuration, the light source unit 41 is moved to an arbitrary position while maintaining a substantially constant interval with respect to the work W, and irradiation is performed from a direction substantially normal to the irradiation surface. In this embodiment, the support 4
7 are two struts (from the one near the base 46 to the strut 47)
A, the support 47B is denoted by a reference numeral), the support 47 is rotatably supported (horizontally revolvable) around the Z axis, and the support 47B and the arm 48 are supported around the X axis. The light source unit 41 is rotatably supported, and
It is supported rotatably about the axis and the Y axis.

Next, an example of a makeup process performed after the makeup pretreatment process will be schematically described. In this step, a so-called hydraulic transfer method is applied. In this method, a transfer film coated with transfer ink is floated on a liquid surface of a transfer tank storing an appropriate liquid, and the transfer film is applied from above. The work W that has completed the pre-processing is pressed, and the transfer ink is printed on the surface of the work W by the liquid pressure. Note that the makeup is not limited to such a hydraulic transfer method, and various makeups such as painting by applying a spray gun that sprays and paints the paint in a mist state are possible.

Next, the makeup pretreatment method of the present invention will be described together with the operation of the makeup pretreatment device 1 configured as described above. (1) Transfer of Work First, prior to substantial UV irradiation, the work W is placed in the irradiation chamber 3.
Transported to At this time, the work W is held by the work holding member 22 by, for example, fitting the holding portion 27 into the mounting hole Wh, and the work holding member 22 is formed integrally with the wheel 25 below the hanger conveyor 21. It is hooked on the hooking member 23 and transported along the rail 24 to the irradiation chamber 3. In this embodiment, the work W is hung on the hanger conveyor 21 via the work holding member 22 between the hanging member 23 and the work W, but this is done by transferring the work W in the subsequent hydraulic transfer. The work W together with the work holding member 22 can be removed from the hanger conveyor 21 when immersed in the bath. However, for example, if painting can be performed by applying a spray gun or the like without removing the work W from the hanger conveyor 21, the work W can be hung directly on the hanger conveyor 21 without applying the work holding member 22.

(2) Preparation for UV Irradiation When the work W is transferred to the irradiation chamber 3, specifically, the irradiation space 31 in which the irradiation device 4 is installed, the transfer of the work W is temporarily stopped, and the entrance and exit of the irradiation chamber 3 are entered. Shutter 32 is closed and hermetically closed. The irradiation space 31 is bent in a key shape, and the inner wall of the irradiation chamber 3 is coated with black to prevent direct leakage of the ultraviolet rays from the irradiation chamber 3 and leakage due to irregular reflection.

(3) UV Irradiation After such preparation is completed, the work W is irradiated with ultraviolet rays. At this time, the light source unit 41 is moved to an arbitrary position by the manipulator 42 so as to maintain a substantially constant distance from the surface of the work W and a substantially constant speed as shown in FIG. At the same time, the light source unit 41 is set so as to irradiate the irradiation surface of the work W substantially from the normal direction. In order to control the irradiation distance to be substantially constant, the work W
Is moved to an appropriate position in the irradiation space 31, then the manipulator 42 is remotely operated on the spot, and while setting a plurality of plot points almost constant distance from the surface of the work W,
The position data is sequentially stored, a smooth curve connecting almost all the stored plot points is determined, and the irradiation unit 41 is moved along the curve to irradiate ultraviolet rays. Therefore, in the embodiment shown in FIG. 5, the work W is irradiated with ultraviolet rays in a substantially vertical direction. However, for example, the work W may be irradiated with ultraviolet rays in various directions such as a horizontal direction.

In this embodiment, the work W is temporarily stopped, and only the light source unit 41 is moved to perform the ultraviolet irradiation. However, for example, the light source unit 41 is fixed and the irradiation space 31 is formed. Work W when passing
May be appropriately moved three-dimensionally with respect to the light source unit 41. Alternatively, the work W may be set to continue moving linearly along the rail 24, and the light source unit 4 may be moved.
A mode in which the workpiece 1 is moved three-dimensionally as appropriate, that is, a mode in which both the work W and the light source unit 41 are moved is possible. In any case, it is desirable to maintain the relative irradiation distance and the irradiation speed between the light source unit 41 and the work W substantially constant and to irradiate ultraviolet rays from the normal direction of the irradiation surface. Thereafter, the work W to which the ultraviolet irradiation has been performed is conveyed to a makeup process, and makeup such as painting or printing is applied to the surface.

[0028]

According to the first or sixth aspect of the present invention, the irradiation distance is maintained within an appropriate range during the irradiation of the ultraviolet light, so that the work W has an irregularly curved surface and is formed into a relatively large size. Irradiation of the ultraviolet rays onto the work surface can be performed uniformly. Further, not only a form in which the work W is fixed and the light source unit 41 is moved, but also various irradiation forms such as a form in which the light source unit 41 is fixed and the work W is moved can be adopted.

According to the second, third, seventh or eighth aspect of the present invention, a specific structure for uniformly irradiating the surface of the work with ultraviolet rays is made possible.

According to the fourth or ninth aspect of the present invention, the irradiation distance between the light source unit 41 and the work W is maintained, and the irradiation is performed substantially in the normal direction of the irradiation surface. I can do it.

According to the fifth or tenth aspect of the present invention, a work W which forms a complicated three-dimensional curved surface can also be used.
Complex transfer patterns can be printed more stably.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a makeup pretreatment device of the present invention is incorporated in a stage prior to a hydraulic transfer process, and a perspective view showing an irradiation device.

FIG. 2 is an explanatory diagram showing a transport device.

FIG. 3 is an explanatory diagram illustrating a state where a work is mounted on a transfer device.

FIG. 4 is a perspective view showing an irradiation device.

FIG. 5 is an explanatory diagram showing a manner of irradiating a workpiece with ultraviolet light.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Makeup pretreatment apparatus 2 Conveying apparatus 3 Irradiation room 4 Irradiation apparatus 21 Hanger conveyor 22 Work holding member 23 Hanging member 24 Rail 25 Wheel 26 Frame type body 27 Holding section 28 Shape detection plate 28a Detection hole 29 Hanging section 31 Irradiation space Reference Signs List 32 Shutter 33 Exhaust duct 41 Light source unit 42 Manipulator 43 Mercury lamp 44 Reflector 45 Quartz glass 46 Base 47 Support 47A Support 47B Support 48 Arm W Work Wh Mounting hole

Claims (10)

[Claims] 1. Prior to performing makeup on a workpiece formed from an appropriate resin material so as to have an irregular surface,
In the method of performing pretreatment by ultraviolet irradiation, the ultraviolet irradiation is performed while maintaining the irradiation distance between the light source unit that irradiates the ultraviolet light and the work within an appropriate range, and relatively moving at an appropriate speed. Characteristic pre-treatment method for workpieces with irregular surfaces. 2. The ultraviolet irradiation is performed on a workpiece set in a fixed state while a light source unit moves along the surface of the workpiece, and the movement is performed while the irradiation distance and the moving speed are maintained substantially constant. 2. The method according to claim 1, wherein the method is performed in an inclined state. 3. The irradiation of the ultraviolet rays is performed while the work is appropriately three-dimensionally moved with respect to the light source unit set in a fixed state, and the movement is performed while the irradiation distance and the irradiation speed are maintained substantially constant. 2. The method according to claim 1, wherein the method is performed in an inclined state. 4. The method according to claim 1, wherein the ultraviolet rays are applied from a normal direction of an irradiation section of the work. 5. The method according to claim 1, wherein the makeup is hydraulic transfer. 6. Prior to performing makeup on a workpiece formed from an appropriate resin material so as to have an irregular surface,
An apparatus for irradiating a work with ultraviolet light at a stage before makeup, comprising a light source unit for irradiating ultraviolet light and an irradiation chamber for installing the light source unit, wherein the light source unit maintains an irradiation distance with the work within an appropriate range. And a work pre-treatment device for irregularly shaped work, wherein the work is irradiated while moving relatively at an appropriate speed. 7. The light source unit emits ultraviolet light while moving along the surface of a work set in a fixed state, and moves the light source unit in a state where the irradiation distance and the moving speed are maintained substantially constant. 7. The apparatus for pre-treating a workpiece with an irregularly curved surface according to claim 6, wherein 8. The work is irradiated with ultraviolet light while appropriately moving three-dimensionally to the light source unit set in a fixed state, and the movement is such that the irradiation distance and the irradiation speed are maintained substantially constant. 7. The apparatus for pre-dressing an irregularly shaped workpiece according to claim 6, wherein the apparatus is performed in a state. 9. The pretreatment apparatus according to claim 6, wherein the ultraviolet rays are irradiated from a normal direction of an irradiation section of the work. 10. The apparatus according to claim 6, wherein the makeup is a hydraulic transfer.