JPS6291273A - Method for surface processing of interior parts of automobile - Google Patents

Abstract

PURPOSE:To make it possible to simply and economically obtain high-grade feeling even in a normally specified car, by transferring a pattern to the surface to be processed of car interior parts under liquid pressure and subsequently electrostatically flocking stable fibers to the pattern in such a degree that the pattern can be seen through a transparent adhesive. CONSTITUTION:A product 1 to be processed is fed while suspended from the hanger 6 of a conveyor so that the surface K to be processed thereof is directed downwardly to receive rough coat by a painting machine 7 and subsequently pressed to the transfer film 10 floated in a liquid tank 12 to transfer a printing pattern onto the surface K. A transparent adhesive or an adhesive becoming transparent in a drying state is sprayed to the surface K to be processed after transfer from a spray gun 13 and, subsequently, a predetermined amount of piles supplied from a pile supply apparatus 16 is electrostatically flocked to the adhesive coating surface. If the density of piles flocked at this time is set to such a degree that the pattern transferred to the surface K to be processed under liquid pressure can be seen through, a desired picture pattern of a single color is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface processing method for automobile interior parts, which performs decorative processing on the surfaces of various molded parts installed in the interior of an automobile.

[Prior art and its problems]

Traditionally, luxury spec cars have been lined with velvet not only on the interior of the doors, center pillars, etc., but also on the surfaces of armrests, dash boards, etc. to create a sense of luxury in the interior. In cars, it is common to leave the surfaces of armrests, dash boards, etc. made of plastic molded parts exposed, due to manufacturing costs.

In addition, in recent years, in response to the increasing preference of consumers for luxury products,
We can also electrostatically flock short fibers called pile to imitate the velvet upholstery of luxury spec cars on the surfaces of parts such as armrests used in standard spec cars, creating a luxurious feel similar to velvet upholstery at low cost. However, in this case, the actual situation is that the pile consisting of a single color is flocked all over, and for example, flocking in a pattern such as a check pattern is not performed.

This is because interior parts for standard-spec cars are required to be mass-produced at low cost, and the troublesome process of forming desired patterns by planting piles in multiple colors on the surface of the interior parts is not profitable. It is from.

First, the flocking technology involves applying adhesive to the surface of the part to be flocked, and then attaching it to the part at a predetermined distance (5 to 30 cm).
A high voltage of about DC-15 to 100 Kv is applied to the electrodes disposed while maintaining the above-mentioned parts, and the parts are grounded to form an electrostatic field between them, and in this state, a length of about 0.2 to 10. 0
Since the method involves flying piles of about 1.0 mm in diameter toward the surface of the component and adhering them to the adhesive layer using electrostatic attraction, it is possible to flock piles of multiple colors according to color along a predetermined pattern. First, apply adhesive to only the part of the pattern where you want to flock the first color pile, then apply adhesive to the part of the pattern where you want to flock the second and third color pile, and do the same. This is because it is troublesome to have to repeat the process, which increases the number of man-hours and significantly increases manufacturing costs.

In particular, when flocking piles for each color, there is the hassle of having to mask off the other parts one by one and then apply the adhesive with a sprayer.In addition, there are holes and irregularities for installing various switches, meters, etc. The process of masking the surfaces of armrests, console boxes, etc., which have complex shapes with curved surfaces, is extremely troublesome, and there is a problem in that it is not suitable for surface processing of automotive parts for regular specification vehicles, which require mass production. .

[Purpose of the invention]

Therefore, the present invention has been devised to provide a velvet-covered material with a desired pattern such as a check pattern on the surface of interior parts for standard-spec cars without impairing the mass production and profitability of automobile interior parts. To provide a surface processing method for automobile interior parts that can be decorated to create a sense of luxury comparable to that of a high-end specification car.

[Structure of the invention]

In order to achieve this objective, the method of surface processing of automobile interior parts according to the present invention involves floating a transfer film on which a predetermined pattern is printed on a liquid surface with the ink side facing up, After the pattern is hydraulically transferred to the surface to be processed by pressing the surface against the surface, an adhesive that is transparent or becomes transparent in a dry state is applied to the surface to be processed, and short fibers are formed to such an extent that the pattern can be seen through. It is characterized by electrostatic flocking.

[Action of the invention]

According to the present invention, it is possible to easily and quickly print a predetermined pattern even on the surface of a component with a complicated shape. Apply a transparent adhesive and electrostatically flock short fibers to such an extent that the pattern can be seen through, and the hydraulically transferred pattern appears through the adhesive layer and flocking applied to the surface. Because it is designed to do this, it eliminates the troublesome masking work and adhesive application work for the surfaces of parts with complex shapes, such as when forming patterns by flocking short fibers of multiple colors in each color. There is no need to repeat the process, and a velvet-like decoration exhibiting a desired pattern such as a plaid pattern can be applied very easily and quickly, and its commercial value can be increased at low cost.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

Fig. 1 is a process diagram showing an example of surface processing of an automobile interior part by the method of the present invention, Fig. 2 is a perspective view showing an example of an automobile interior part subjected to surface processing by the method of the invention. I[I-[This is a cross-sectional view.

In the figure, ■ is an armrest fixedly installed inside the door; 1. A mounting hole 2 for an operation switch that automatically opens and closes the window of the door is drilled in the center, and protrusions 3 are formed along the left and right edges of the mounting hole 2, and the outer peripheral edge is curved. 4 (as shown in Figure 2).

This armrest 1 is integrally molded from plastic, and is transported suspended from a hanger 6 of a conveyor 5 as shown in FIG. 1 with its upper surface to be processed facing downward.
After the surface to be processed K is coated with a predetermined color paint by the coating machine 7, a predetermined pattern is hydraulically transferred by the hydraulic transfer device 8, and then the pile is flocked by the electrostatic flocking device 9. has been completed.

The hydraulic transfer device 8 includes a printer 11 that prints a predetermined pattern on a transfer film 10, and a transfer film l on which the pattern is printed.
The process surface K of the armrest 1 is pressed onto the transfer film 10 floating in the liquid tank 12, and the surface K of the armrest 1 is pressed onto the liquid tank 12.
2, the ink surface of the transfer film 10 is brought into close contact with the surface K to be processed, and the pattern printed on the transfer film 10 is transferred to the surface K to be processed by hydraulic pressure.

As a result, the operation switch mounting hole 2. Projections 3 and curved surfaces 4
A desired pattern can be easily and quickly printed even on the processed surface K of the armrest 1, which has a complicated shape.

The transfer film 10 is made of a material that is melted by the liquid in the liquid tank 12, and is melted and removed from the processed surface K after the transfer is completed, so that only the transferred pattern remains on the processed surface K. has been completed.

The electrostatic flocking device 9 includes a spray gun 13 that applies a transparent adhesive or an adhesive that becomes transparent in a dry state all over the processed surface K of the armrest 1, and a spray gun 13 that is arranged at a predetermined distance from the armrest 1. mesh-like high voltage application electrode 14
and a ground electrode 15 that is brought into sliding contact with the hanger 6 that suspends the armrest 1 to ground the armrest 1, and a pile that flies upward from behind the high voltage application electrode 14 toward the processed surface K of the armrest 1. It is composed of a pile supply device 16.

Then, adhesive is first sprayed with the spray gun 13 onto the processed surface K onto which a predetermined pattern has been hydraulically transferred by the hydraulic transfer device 8, and then the DC-15~
A high voltage of about 35 Kv is applied to form an electrostatic field between the two electrodes, with the armrest 1 in sliding contact with the ground electrode 15 serving as an anode and the high voltage applying electrode 14 as a cathode, and a predetermined amount of pile is supplied from the pile supply device 16. to fly upwards.

As a result, each pile is charged by the high voltage application electrode 14, is attracted to the workpiece surface K of the armrest 1 having the opposite polarity, pierces the adhesive layer applied to the workpiece surface K, and is flocked perpendicularly to the surface. It will be done.

In addition, as adhesives, emulsion/latex type (acrylic, vinyl acetate-vinyl chloride copolymer, ethylene vinyl acetate, etc.), thermosetting resin (melamine resin)
The coating amount is set to about 250 g/I, and the coating thickness is set to about 0.25 mm. Further, the length of the pile is selected to be, for example, about 1 mm, and the thickness is selected to be about 4 denier.

Further, in the figure, 17, 18 and 19 are infrared drying lamps, respectively, and 20 is a high voltage generator.

The above is an exemplary configuration of a surface processing line for carrying out the method of the present invention and an automobile interior part to be surface-processed.Next, the method of the present invention will be explained in more detail with reference to FIG.

The armrest 1 is suspended from a hanger 6 of a conveyor 5 with its processed surface K facing downward, and first, a paint of a desired color is sprayed onto the processed surface K by a coating machine 7.

Next, after drying the paint film spray-painted on the processed surface K using an infrared drying lamp 17, the armrest 1 is conveyed onto the liquid tank 12 of the hydraulic transfer device 8, and A transfer film 10 on which a predetermined pattern has been printed by a printing machine 11 is floated on the liquid surface of a liquid tank 12 with its ink side facing upward.

In this state, press the processed surface K of the armrest 1 suspended from the hanger 6 of the conveyor 5 from above the transfer film 10, and while submerging the transfer film lO together with the armrest ■ into the liquid tank 12, move the conveyor 5 along the transport direction. As a result, the transfer film 10 comes into close contact with the surface K to be processed so as to cover the armrest 1, and the pattern of the transfer film 10 is transferred to the surface K to be processed by hydraulic pressure, and the transfer film 10 after the transfer is completed is It is melted in the liquid in the liquid tank 12.

Then, the armrest 1 is pulled up from the liquid tank 12, dried with an infrared drying lamp 18, and the electrostatic flocking device 9
Transport to.

In the electrostatic flocking device 9, first, a predetermined amount of adhesive that is transparent or becomes transparent in a dry state is sprayed from the spray gun 13 onto the surface K to be processed, and then the hanger 6 is brought into sliding contact with the ground electrode 15 to attach the armrest 1. Ground it.

Then, D from the high voltage generator 20 to the high voltage applying electrode 14.
At the same time, a high voltage of approximately 25Kv is applied to form an electrostatic field between the workpiece surface and the pile is flown from the pile supply device 16 toward the workpiece surface K, thereby removing the adhesive applied to the workpiece surface K. Each pile is attracted to one side of the agent layer using electrostatic attraction force, and the hair is implanted.

At this time, the density of the pile to be flocked is the transparency of the pile 1
Depending on the color, length, etc., the pattern is selected to such an extent that the pattern transferred by hydraulic pressure to the processed surface K of the armrest 1 can be seen through.

When the flocking is finished, the application of high voltage is stopped, the armrest l is given a slight vibration (not shown), the excess pile that has not been bonded to the adhesive layer is dropped, and the adhesive layer is removed using an infrared drying lamp 19. After drying, the remaining pile is completely removed by brushing, etc., to complete the surface treatment.

Processed surface K of armrest 1 surface processed as described above
As shown in FIG. 3, from the bottom, the undercoat fii20. Pattern 21 printed by hydraulic transfer.
Once the transparent adhesive layer 22 is formed, the adhesive N2
Flocking made of pile P is applied to the surface of 2.

Therefore, the surface of the armrest 1 simply has a velvet-like feel due to the flocked pile P;
Instead, a checkered pattern 21 as shown in FIG. 2 appears through the pile P and the transparent adhesive layer 22, and this pattern 21 becomes faint and subdued through the flocked pile P. It exhibits color tones, and an excellent decorative effect can be obtained, as if a pattern had been formed by flocking piles of multiple colors in different colors.

As described above, according to the method of the present invention, first, the operation switch mounting hole 2. A predetermined pattern is printed by hydraulic transfer on the processed surface K of the armrest 1, which has a complex shape including protrusions 3 and curved surfaces 4, etc., and then, similar to the conventional surface processing method for automobile interior parts, the armrest is Simply apply adhesive to the surface to be processed 1 using the spray gun 13 and electrostatically flock the pile P in a single color, and the desired amount of adhesive can be applied without any troublesome masking work or adhesive application. It is possible to perform a velvet-like surface treatment that exhibits a design pattern, and it is possible to obtain automobile interior parts of unprecedented high quality at low cost.

Further, as in the embodiment, if the undercoat layer 20 is formed by first spraying paint of a predetermined color on the processed surface K of the armrest 1, the pattern transferred thereon will become the undercoat layer 20. Since the paint film is colored and can be seen through, it is possible to surface finish the interior parts of the car, such as the armrest 1, in the same color to match the color of a wide variety of car bodies, for example, by simply changing the color of the paint supplied to the coating machine 7. It has the advantage of being able to

In addition, in the explanation of the above embodiment, the case where the up method in which the pile P is flown from below is used as the electrostatic flocking means is explained, but the present invention is not limited to this, and the present invention is not limited to this, but can also be applied to the down method, side method, amplifier down method, etc. may be adopted arbitrarily.

Further, the length, thickness, and color of the pile P can be arbitrarily selected within a range that does not hide the pattern transferred and printed on the surface.

〔Effect of the invention〕

As described above, according to the present invention, a predetermined image can be printed easily and quickly on the processed surface of an automobile interior part formed into a complex shape having holes, unevenness, curved surfaces, etc. The mass production of automobile interior parts has been made possible by an extremely simple method of printing a pattern, applying a transparent adhesive or an adhesive that becomes transparent when dry, and then electrostatically flocking short fibers to the extent that the pattern can be seen through. , the product value can be significantly improved by decorating the surface with a velvet-like decoration with a desired pattern without impairing profitability;
It has the excellent effect of being able to upgrade standard specification cars at low cost.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing an example of the method of the present invention, Fig. 2 is a perspective view showing an example of an automobile interior part subjected to surface treatment by the method of the present invention, and Fig. 3 is a cross-sectional view taken along the line ■-■. . Explanation of symbols 1.-Armrest (car interior parts), 8..-Hydraulic pressure transfer device, 9..-Electrostatic flocking device, 10.-Transfer film, 12.-Liquid tank, 13.Applying adhesive Spray gun, 14-・High voltage application electrode, 15-Ground electrode, 16・-
・Pile feeding device.

Claims (1)

[Claims] A transfer film printed with a predetermined pattern is floated on the liquid surface with the ink side facing up, and the processed surface of the automobile interior part is pressed onto the film to transfer the pattern onto the processed surface using hydraulic pressure. A method for surface processing of automobile interior parts, characterized in that an adhesive that is transparent or becomes transparent in a dry state is applied to the surface to be processed, and short fibers are electrostatically flocked to such an extent that the pattern can be seen through.