JPS5814838A - Multicolor printing method for signboard or the like - Google Patents

Abstract

PURPOSE:To perform sharp multicolor printing by forming an undercoating paint film being soluble in an org. solvent and a photosensitive emulsion film successively on a substrate surface, exposing, developing and fixing a design film thereto, and removing the exposed parts of the undercoating paint film with a solvent then forming a colored paint film on the exposed substrate surface and removing the sensitized film. CONSTITUTION:After an antistatic agent is coated thinly on the surface to be painted of a substrate 1 for signboards, etc., an undercoating paint film 2 being soluble in an org. solvent, for example, black lacquer is applied thereon and a photosensitive emulsion film 3 is coated on the film 2. The film 3 is formed of the unsensitized film 3a which is water soluble and the sensitized film 3b which is hardly soluble in water and can be removed by wiping with cloth impregnated with an aq. soln. contg. NaOH or synthetic detergents. A design film 4 is superposed on the film 3 and is exposed, then the substrate is immersed in water to remove the unsensitized film 3a and to expose the film 2 thereunder. The exposed film 2 is removed with a solvent to expose the substrate 1 thereunder. After a colored paint film 5 is formed on the substrate by covering the exposed substrate surface, the film 3b is wiped away, whereby the sharp images and character where the undercoating film 2 and the film 5 do not overlap are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor printing method for various signboards, illuminated signboards, dial boards for audio products, etc., which is suitable for small-scale production and in which designs are formed in one or more colors on a substrate. It is.

BACKGROUND ART Conventionally, as a method of applying multicolor printing to signboards, dial boards of audio equipment, etc., a method using silk printing is known. However, with this conventional multicolor printing method, when printing multicolors on a board, the overlaid colors shift from the specified position and overlap with the underlying color, so it is difficult to print finely designed letters, figures, etc. Not only is it impossible to print with clear outlines, but due to the printing technology of silk printing, it is difficult to apply thick ink and print on large substrates, and printing costs are high due to the use of plate making. There was such a problem. Furthermore, it has been thought that clear multi-color printing is impossible with conventional printing methods that use a combination of painting and photography.

However, the present invention utilizes the invention and technology used in the monochrome printing method for illuminated signboards, etc. described in Japanese Patent Application Laid-open No. 1983-91407, which was proposed by the present inventor/applicant. The purpose of the present invention is to provide a multicolor printing method for clear signboards, etc. with a large number of colors, by a printing method that uses both painting and photographic techniques.

That is, the present invention (firstly, a photosensitive emulsion film forming step in which an organic solvent-soluble base coating film is formed on the upper surface of a substrate that has been subjected to a pretreatment step, and then a photosensitive emulsion film is formed on the base coating film). 2. Formation of a photosensitive emulsion film by applying an appropriate light source through the designed film to form a physically removable photosensitive film according to the design of the film by developing and fixing. and a design cutting step in which the base coating film under the unsensitized film exposed during development and fixing in the photosensitive film forming step is removed with an organic solvent to expose the substrate under the unsensitized film; a colored coating film forming step of forming a suitably colored coating film on at least a portion of the substrate exposed in the design cutting step and at least the upper surface of the photosensitive film surrounding the substrate; A multicolor printing method for signboards, etc. that uses both painting and photographic technology, which includes a removal step of physically removing all of the photosensitive film to expose the base paint film and the colored paint film. It is.

According to the above-mentioned method according to the present invention, unnecessary portions of the outer periphery of the colored coating film directly applied on the designed substrate are removed from the edge of the colored coating film forming step by the following removal step.
Since the removal process is carried out to remove the unnecessary parts of the colored paint film together with the photosensitive film on the lower surface, the color overlap between the colored paint film and the base paint film as other colored paint films is completely reduced, making it extremely Multi-color printing with a sharp thick film has the excellent effect of forming a film in a printing method that uses both painting and photographic technology. Furthermore, the multicolor printing method of the present invention does not require the use of expensive plate making, and therefore has the effect of allowing high quality multicolor printing at low cost.

In the above invention, various plastic plates, particularly acrylic plates, metal plates, etc. can be used as the substrate, and the range of application thereof is as described above, as it can be applied to various signboards, instruction boards, etc. If a transparent plate is used as the light source, it will be useful for a multicolored illuminated signboard having a light source on the back side. In the above photosensitive emulsion film forming step,
If the number of coats of the base coat is increased and the thickness of the base coat is made larger than that of the colored coat, letters, figures, etc. can be given a three-dimensional effect.

Furthermore, in the above-mentioned colored coating film forming step, if a plurality of different colored coating films are applied to a plurality of design cut-out portions of the same substrate, this kind of multicolor printing of two or more colors can be performed at a time. can be set.

Next, an example of this invention will be described.

First step (pretreatment step) 7J, which describes the first step as a pretreatment step with reference to FIG.

An antistatic agent is applied to the painted surface 1a of the upper surface of a plastic substrate, for example a white acrylic substrate 1, to prevent dust from being attracted. This antistatic agent must match the properties of the acrylic substrate 1, as well as the properties of the paint to be applied to the surface 1a to be painted in the next step and the photosensitive emulsion to be applied to the soil. However, if the surface 1a to be painted is dirty, the surface 1a to be painted is cleaned with alcohol or the like, and an antistatic agent is mixed in the alcohol and applied.

This step is a pretreatment step for applying the paint to the surface 1a to be painted in the next step, and if the antistatic agent is applied thickly to the surface 1a to be painted, the adhesion of the paint to the surface 1a to be painted will be poor. Therefore, care must be taken regarding the amount of antistatic agent applied.

Second Step (Painting and Photosensitized Emulsion and Film Forming Step) The second step as a coating and one photosensitive film forming step will be described with reference to FIG.

An organic solvent-soluble lacquer paint, for example, black, is applied to the surface 1a of the acrylic substrate 1 that has been subjected to the pretreatment process to form a base coating film 2. A photosensitive emulsion is applied onto this base coating film 2 to form a photosensitive emulsion film 3. Note that the unsensitized film 3a of this light-sensitive emulsion film 3 is water-soluble, and the light-sensitive film 3a is water-soluble.
b (see Figure 3) is poorly water-soluble and can be removed by wiping the unsensitized film 3a with a cloth impregnated with supinated soda or synthetic detergent aqueous solution: Ik9 , Third Step (Photosensitive Film Forming Step) The third step as a photosensitive film forming step will be described with reference to FIGS. 3 and 4.

On the acrylic substrate 1 on which the photosensitive emulsion film 3 has been formed in the above process, the designed fiisin 4 is superimposed.

This film 4 has an opaque portion 4a in which characters and figures are
The other portions of the transparent portion 4b are sharp. Next, a suitable light source such as a mercury lamp, an arc lamp, or an ultraviolet lamp is irradiated from above the design film 4 to expose the portion of the photosensitive emulsion film 3 corresponding to the transparent portion 4b. Then, the design film 4 is removed from the acrylic substrate 1, and the acrylic substrate 1 is immersed in water or hot water to develop and fix the photosensitive emulsion film 3. By this development and fixation, the unsensitized film 3a of the light-sensitive emulsion film 3, that is, the text and figure parts are dissolved, and by washing with water or hot water, the text and figure parts are removed, as shown in FIG. The base coating film 2 under the photosensitive film 3a is exposed. Note that if the acrylic substrate 1 is physically acted upon during the development and fixing work, the photosensitive film 3b of the photosensitive emulsion film 3 will be damaged, so care must be taken.

Fourth process (design cutting process) The fourth process as a design cutting process will be explained with reference to FIG. The base coating film 2 under the unsensitized film 3a exposed during development and fixing in the photosensitive film forming step is dissolved with lacquer thinner as an organic solvent, and then removed and allowed to air dry. On the acrylic substrate 1, a design groove D2 representing characters and figures corresponding to the opaque portion 4a of the design film 4 is formed, and the depth of the design groove D2 is determined by the base coating. 2 and photosensitive emulsion 7 film 3
The upper surface of the acrylic substrate 1 is exposed at the bottoms of the design grooves DI and D2. Incidentally, since the photosensitive film 3b of the photosensitive emulsion film 3 is insoluble in FF5 solvents such as lacquer thinner, only the exposed base coating film 2 is selectively dissolved by the lacquer thinner without being dissolved. It shows in particular.

Fifth step (colored coating film forming step) The fifth step as a colored coating film forming step will be explained with reference to FIG. 6. 1. Acrylic substrate 1 exposed in the above design cutting step
On top, masking M is applied around the area with paper and adhesive tape except for the part with the letters EXIT.

Next, a colored paint, for example red, that matches the properties of the acrylic substrate 1 and is different from the color of the base coating film 2 is spray-painted on the design cut-out groove D1 representing the characters EXIT, and the design cut-out groove D1 and A colored coating film 5 is formed around it.

Sixth process (removal process) The sixth process as a removal process will be explained with reference to FIG.

After the colored coating film 5 has dried, masking M
is removed, and the photosensitive film 3b on the acrylic substrate 1 is rubbed with a cloth soaked in water or synthetic detergent water, or by a physical method such as scrubbing with a scrubbing brush. The upper unnecessary colored coating film 5a is removed to expose the base coating film 2 and the colored coating film 5. Therefore, in the design cutout groove D1 representing the characters EXIT, a colored paint film 5 is formed on the remaining base paint film 2 and the road surface, and the color of the colored paint film 5 and the base as another colored paint film are formed. Paint film 2 (
There is no overlap with the color (black), and the character EXIT.

This results in a sharp outline. Further, since the white color of the substrate 1 is exposed in the design cutout groove D2 representing the figure, the figure is represented in white. The entire surface of the acrylic substrate 1 designed in this manner is spray-coated with an organic solvent-soluble matte paint to protect the surface of the colored coating film 5 and base coating film 20.

[Brief explanation of the drawing]

The figure shows the printing process of a signboard by the multicolor printing method of the present invention.
The plan view and side view showing the process, Fig. 2 (A), Φ) are the plan view and side view showing the second process, Fig. 3 (5), ([3
) is a plan view showing the first stage of the third process and its sectional view taken along the line I-I, and Figure 4 (g), ff3) is a plan view showing the second stage of the third process and its sectional view 5 is a plan view showing the fourth step and its sectional view taken along line m--■. FIG. 6 is a plan view showing the fifth step and its sectional view taken along line IV--IV. FIG. 7 is a plan view showing the sixth step and a sectional view taken along the line v-■. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Base coating film as another colored coating film, 3... Light-sensitive emulsion film, 3a... Desensitized film, 3b
...Photosensitive film, 4...Designed film, 4
a... Opaque area, 4b... Transparent area, 5... Colored coating film, DI. D2...Design groove. Patent applicant Takashi Endo - Agent Patent attorney Norimitsu Nishimura 1 Figure 1 Figure 2

Claims (1)

[Claims] A coating and photosensitive emulsion film forming step of forming an organic solvent-soluble base coat on the surface of the substrate that has been subjected to the pretreatment process, and then forming a photosensitive emulsion film on the base coat; A photosensitive film forming step of developing and fixing a physically removable photosensitive film according to the design of the film using an appropriate light source through a film designed as an emulsion JIK J-, and forming the photosensitive film. The design cutting process, which is used during development and fixing in the process, involves removing the base coating film under the unsensitized film using an organic solvent to expose the substrate under the unsensitized film, and this design cutting process. a colored coating film forming step of forming a suitably colored coating film on two surfaces of at least a portion of the exposed substrate and at least the surrounding photosensitive film; and a colored coating film forming step on the substrate. A multicolor printing method for signboards, etc., comprising the step of physically removing all of the undercoating film and the colored coating film to expose the base coating film and the colored coating film.