JPH0871490A - Method of forming clear protective coating layer on hot stamp foil layer - Google Patents

Abstract

(57) [Abstract] [Purpose] On the hot stamp foil film layer 3 formed on the top surface of the convex portion 1a of the mark (for example, letter shape) formed by embossing on the surface of the synthetic resin molded product 1. Further, there is provided a method for forming the clear protective coating film 11 quickly, easily and with controllable film thickness dimension without bleeding from the contour of the mark. [Structure] A screen 8 having a stencil portion 8a having the same shape as the mark represented by the hot stamp foil layer 3, and a Ford cup viscometer (FC # 4) 50-60 /
Screen printing is performed using the clear paint 9 of sec. The clear coating material having the above viscosity range has an appropriate adhesive force, and the clear protective coating layer 11 conforming to the contour of the hot stamp foil film layer 3 is formed without causing bleeding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin molded article formed by embossing a mark composed of characters, figures or symbols or a combination thereof, and the top surface of the embossed mark. The present invention relates to a method for forming a clear protective coating layer by covering the surface of the hot stamp foil layer when the hot stamp foil layer is fixed to the.

[0002]

2. Description of the Related Art A member in which letters and the like are embossed and molded on the surface of a synthetic resin and a hot stamp foil layer is laminated thereon is
For example, it is widely used as an exterior device for automobiles. Fig. 2 shows a conventional example in which letters are formed by embossing on the surface of a synthetic resin molded product, (A) is a partially cutaway perspective view, and (B) is a floating image on the surface of the synthetic resin molded product. It is sectional drawing which drew typically the state which fixed the hot stamp foil layer to the top surface of the character formed by extrusion. However, since it is schematically illustrated, the dimensional proportions are not expressed realistically. Hot stamps are also called foil stamps,
Peeling metal vapor deposition foil (foil) coating A plastic film or tape is placed on the surface of a plastic molded product, etc., and a heated metal plate or silicon plate is pressed for a short time to form convex characters or patterns on the metal plate. A processing method that engraves a corresponding metal foil letter or pattern (using a plastic glossary),
Widely used. In the conventional example shown in FIG. 2, a synthetic resin molded article 1 is formed by embossing a convex portion in the shape of the letter “A” on the surface. Two character-shaped convex portions 1a appear in a cross section obtained by cutting this on the virtual surface 2 shown in the figure. A hot stamp foil layer 3 is formed on the top surface of the letter-shaped convex portion 1a (see FIG. 2B). The hot-stamped synthetic resin molded product has a metallic luster in the shape of the mark, is beautiful, and has a high design value.

[0003]

For example, a member made of a synthetic resin used as an automobile exterior component has a problem of chipping. This is a phenomenon in which the surface of a synthetic resin member is damaged by the impact of pebbles and the like that are blown off by wheels, and the appearance of the hot-stamped synthetic resin molded product is significantly impaired if chipping occurs. . Further, even if the hot stamp foil film is worn or disappears due to the external frictional force, the appearance is significantly impaired. In order to prevent such chipping and the like, clear coating may be applied to protect the hot stamp foil layer, but it has not been widely used because of the following problems. FIG. 3 is a view for explaining a problem when applying a clear coating according to the prior art on the hot stamp foil layer, and (A) is a sectional side view showing a state during coating,
(B) is a schematic cross-sectional view showing a state where a clear coating is applied, and (C) is a schematic external perspective view showing a state where a clear coating is applied, and the clear coating is represented by spots. . As shown in FIG. 3 (A), the mask jig 4 covers the portions other than the convex portions of the character shape, the hot stamp foil layer 3 is exposed, and the clear paint is sprayed by the spray gun 5. However, since the mist (fine particles) of the clear paint enters the portion covered with the mask jig 4, the finished state as shown in FIG.
The mist of the paint adheres to the portion corresponding to the foot of the (shown by reference numeral 7). Looking at this from an external view, as shown in FIG. 3C, the convex portion of the character shape (hot stamped)
Clear coating around the circumference of the mark makes the outline of the mark blurred (according to the painting term, the parting cannot be finished neatly). Since spraying clear paint causes problems (mist adhesion) as shown in FIG. 3, screen printing using clear paint as an ink has also been tried.
Due to the good adhesion of the clear paint to the synthetic resin molded product, the printed mark bleeds around and the outline is blurred. In addition to the above-mentioned fundamental problems, maintenance of the mask jig (reference numeral 4 in FIG. 3A) requires a lot of time and labor, and the coating film thickness can be made uniform. In addition to being difficult, there are problems such as difficulty in controlling the thickness of the coating film. For this reason, it has been conventionally said that economically profitable clear coating cannot be applied on the hot stamp foil. The present invention has been made in view of the above circumstances, and for a synthetic resin molded product that has been subjected to hot stamping so as to form a mark, without causing protrusion from the contour of the hot stamping foil. Quick, easy,
An object of the present invention is to provide a method for forming a clear coating film layer at a low cost so that the film thickness of the coating film can be controlled.

[0004]

The basic principle of the method of the present invention created in order to achieve the above object is to improve the screen printing method among the above-mentioned prior arts and to use it as a clear paint. Bleeding is prevented.
The condition of clear paint that does not cause bleeding is, in principle, a problem of balance between adhesive force and surface tension, but focusing on viscosity as a substitute characteristic for practical application, a Ford cup viscometer (FC # In 4), it was confirmed that bleeding could be completely prevented in practice by using a clear coating of 50 to 60 / sec, and the layering technique for the clear protective coating film according to the present invention was completed. Based on the above-mentioned principle, the method of the present invention is a synthetic resin molded article obtained by embossing a mark consisting of characters, figures or symbols or a combination of these on the surface, and the top of the embossed mark mentioned above. When the hot stamp foil layer is fixed on the surface, the viscosity F
C (# 4) 50-60 / sec clear paint is used for screen printing.

[0005]

According to the above means, the viscosity FC (# 4) 50-
The 60 / sec clear coating has sufficient adhesion to the hot stamp foil, does not chemically attack the adhesive layer that bonds the hot stamp foil to the synthetic resin, and exposes the synthetic resin material. Quickly without bleeding on the surface,
The clear protective coating film can be formed easily and at low cost, and the thickness of the clear coating film can be controlled by appropriately selecting the mesh of the printing plate for screen printing.

[0006]

EXAMPLE FIG. 1 is a process diagram showing an example of a method for forming a clear protective coating film layer on a hot stamp foil layer according to the present invention, and (A) is a schematic cross section showing a prepared state. Figure, (B) is a schematic cross-sectional view depicting the state during construction,
(C) is a schematic cross-sectional view illustrating a completed state. The synthetic resin molded article 1 shown in FIG. 1 (A) is a member similar to or similar to the synthetic resin molded article 1 shown in FIG. 2 (B).
The letter-shaped convex portion 1a is embossed and formed, and the hot stamp foil layer 3 is laminated on the top surface thereof. A screen 8 is arranged in parallel with the top surface of the hot stamp foil layer 3 with a gap dimension g, and both ends D and E thereof are supported. The portion of the screen 8 facing the top surface of the letter-shaped convex portion 1a is a stencil portion 8 through which paint can pass.
a and the other part is a non-transmissive shield 8b
It has become. Clear paint 9 on the screen 8
Is on board. 10 is a squeegee. The clear paint 9 in the present invention is a Ford cup viscometer (F
C # 4) 50 to 60 / sec is used. In this example, a reactive coating material composed of acrylic polyol resin and isocyanate was used. As an example different from this example, an acrylic UV-curable paint may be used,
In addition, acrylic ink may be used. When the squeegee 10 is moved in the direction of the arrow F and the clear paint 9 is spread while lightly pressing down the screen 8, the screen 8 elastically bends and abuts the hot stamp foil layer 3 as shown in FIG. The above-mentioned contact is caused by the stencil portion 8
a comes into contact with the stencil portion 8a, and the clear paint adheres to the hot stamp foil layer 3 to form a film. When the squeegee 10 has finished passing, the screen 8 is elastically restored and separated from the hot stamp foil layer 3 as shown in FIG. 1C, and the clear paint attached on the hot stamp foil layer 3 is removed. A clear protective coating layer 11 is formed. The clear paint 9 of this embodiment has a Ford cup viscosity (FC # 4) of 5
Since it is 0 to 60 / sec, it has appropriate adhesiveness, and adheres firmly and firmly to the hot stamp foil 3,
Moreover, the synthetic resin molded product 1 does not seep to the exposed surface. In addition, there is no possibility that the clear paint will attack the adhesive that bonds the hot stamp foil layer 3 to the synthetic resin base. The thickness t of the clear protective coating film layer 11 can be controlled to a desired thickness by changing the mesh roughness of the stencil portion 8a of the screen 8.
Furthermore, after the squeegee 10 has passed, the screen 8
Automatically recovers with elasticity, so you can finish it neatly without any effort.

[0007]

By applying the present invention, the viscosity of FC50-6
The clear coating of 0 / sec has sufficient adhesion to the hot stamp foil, does not chemically attack the adhesive layer that bonds the hot stamp foil to the synthetic resin, and exposes the synthetic resin material. A clear protective coating can be layered quickly, easily, and at low cost without bleeding on the surface, and the thickness of the clear coating can be adjusted by appropriately selecting the mesh of the printing plate for screen printing. It has a great practical effect of being controllable and contributes to the improvement of the surface treatment technology of the synthetic resin molded product.

[Brief description of drawings]

FIG. 1 is a process drawing showing one embodiment of a method for forming a clear protective coating film layer on a hot stamp foil layer according to the present invention, in which (A) is a schematic cross-sectional view showing a prepared state; B)
Is a schematic cross-sectional view illustrating a state during construction, and (C) is a schematic cross-sectional view illustrating a completed state.

FIG. 2 is a perspective view showing a conventional example in which letters are formed by embossing on the surface of a synthetic resin molded product, (A) is a partially cutaway perspective view, and (B) is a surface of the synthetic resin molded product. It is sectional drawing which drew typically the state which stuck the hot stamp foil layer to the top surface of the embossed character. However, since it is schematically illustrated, the dimensional proportions are not expressed realistically.

FIG. 3 is a view for explaining a problem when a clear coating according to the related art is applied on the hot stamp foil layer, and (A) is a sectional side view showing a state during coating,
(B) is a schematic cross-sectional view showing a state where a clear coating is applied, and (C) is a schematic external perspective view showing a state where a clear coating is applied, and the clear coating is represented by spots. .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Synthetic resin molded product, 1a ... Character-shaped convex part, 2 ... Virtual plane (cut surface), 3 ... Hot stamp foil layer, 4 ... Mask jig, 5 ... Spray gun, 6 ... Clear coating film, 7 … Mist of clear paint attached, 8… Screen, 8a…
Screen stencil portion, 8b ... Screen shielding portion, 9 ...
Clear paint, 10 ... Squeegee, 11 ... Clear protective paint film, F ... Squeegee moving direction.

Claims (1)

[Claims] 1. A synthetic resin molded article having a mark, which is a letter, a figure, or a symbol or a combination thereof, formed by embossing on the surface, and a hot stamp foil layer is provided on the top surface of the embossed mark. A method for forming a clear protective coating layer on a hot stamp foil layer, which comprises screen-printing using a clear paint having a viscosity FC (# 4) of 50 to 60 / sec.