JPH0889881A - Method for making clear protective coating film - Google Patents

Abstract

PURPOSE: To provide a method in which a clear protective coating film is formed on a hot stamp foil membrane layer which is formed in a symbol shape (e.g. character shape) on the surface of a synthetic resin molded article without oozing from the periphery of the symbol promptly, easily, and controllably of the film thickness. CONSTITUTION: A clear thin coating film 16 is screen-printed on a transfer plate 14 by a printing screen 8, and a pad 15 is pressed on the coating film to transfer it. The pad, on which the coating film is transferred, is faced with a hot stamp foil layer 3 and, after being pressed according to an arrow (e), separated according to an arrow (f) so that a clear protective layer 17 is left on the hot stamp foil layer 3.

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. In the case where the hot stamp foil layer is adhered to, it relates to a method for forming a clear protective coating film by covering the surface of the hot stamp foil layer, but it is not limited to the embossed synthetic resin molded article, This method can be applied even when a hot stamp foil layer representing a mark is fixed on a flat surface of a resin molded product.

[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, also called foil stamps, are made of metal by placing a peelable metal-deposited foil (foil) -coated plastic film or tape on the surface of a plastic molded product and pressing a heated metal plate for a short time. Alternatively, it refers to a method of engraving metal foil letters or patterns corresponding to the convex letters or patterns of non-metal plate (using a plastic dictionary) and is 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. The cross section taken along the imaginary plane 2 shown in the figure
Two letter-shaped convex portions 1a are shown. 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. As a conventional example different from the above, there is a case where the hot stamp foil layer 3 is formed on the flat surface (the surface on which the letter-shaped convex portion 1a is not formed) of the synthetic resin molded product. In such a conventional example as well, the hot stamp foil layer representing the mark has a metallic luster, which is beautiful and enhances the 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 splashed off by wheels, and the appearance of the hot-stamped synthetic resin molded product is significantly impaired if chipping occurs, and The foil film is worn away by repeated application of external pressure from a car wash brush or the like. In order to prevent such chipping and wear disappearance, it may be considered to apply a clear coating to protect the hot stamp foil layer, but it has not been widely used because of the following problems. FIG. 3 is shown for explaining the problems in applying the clear coating according to the prior art on the hot stamp foil layer. (A) is a sectional side view showing the 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,
The clear paint 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. 3 is obtained, and the paint is applied to a portion corresponding to the foot of the letter-shaped convex portion 1a. Mist adheres (denoted by reference numeral 7). Looking at this from an external view, as shown in FIG. 3 (C), the clear coating is drawn around the convex portion of the character shape (hot stamped), and the outline of the mark is blurred ( According to the painting terms, the parting does not finish 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 attempted, but the clear paint has good adhesion to synthetic resin molded products, so printing The marked mark is blurred around and the outline is blurred. In addition to the above-mentioned fundamental problems, maintenance of the mask jig (reference numeral 4 in FIG. 3 (A)) requires a great deal 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. Even when a hot stamp foil layer is provided on a flat surface having no letter-shaped convex portion 1a shown in FIG. 2 to represent the mark, the same problem as described above occurs and It was difficult to apply clear coating without bleeding or bleeding from the contour. For this reason, it has been conventionally difficult to apply clear coating with economical profitability onto the hot stamp foil. Especially when the shape and size of the mark are complicated and small, or when there are some obstacles near the hot stamp foil, it is very important to provide a clear coating on the hot stamp foil to protect it from chipping and loss of wear. Becomes difficult. 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. It is an object of the present invention to provide a method for forming a clear coating film layer that enables rapid, easy and low cost control of the coating film thickness.

[0004]

In order to achieve the above-mentioned object (clear coating film which does not come out from the outline of hot stamp foil), the present invention displays a mark by being laminated on a synthetic resin molded article. A method for forming a clear protective coating on a hot stamp foil film, comprising: a. Screen printing the above mark on a smooth transfer plate with clear paint, b. Transfer the thin film of clear paint printed on the transfer plate by pressing the smooth surface of a pad made of a flexible material onto the thin film, c. The thin film of the clear paint transferred to the pad is pressed against the surface of the hot stamp foil film to transfer the thin film of the clear paint onto the hot stamp foil film. However, in the present invention, the “smooth surface of the pad” is not limited to a flat surface, and it is necessary that there is no local unevenness, but the surface is a smooth aspect when viewed as a whole. Is also good. Further, in the present invention, the transfer plate is used as a word indicating the function of the member, and does not necessarily have to be a member commonly referred to as a transfer plate, for example, a glass plate. Is also good.

[0005]

According to the above-mentioned means, the screen printing of the mark on the smooth transfer plate by using the clear paint as the printing ink can be carried out without any particular difficulty.
When the pad is pressed against the thin film of clear paint printed on the transfer plate, the thin film of clear paint is transferred to the surface of the pad. In this case, since the pad is made of a flexible material, the pressure distribution on the contact surface becomes uniform even if the drive control is not performed with extremely high precision. As described above, when the pad on which the mark-shaped clear paint thin film is transferred is pressed onto the hot stamp foil film, the clear paint thin film adheres to the hot stamp foil film to form a clear protective coating film. To be done. As can be easily understood from the above-mentioned operation, the clear paint thin film transferred to the pad is transferred to the hot stamp foil film, not the screen printing directly on the hot stamp foil film. It suffices to bring the pad into contact with the hot stamp foil film, and even if there is an obstacle near the hot stamp foil film, the method of the present invention can be carried out if the pad passage exists. Further, since the operation of forming the clear paint thin film into the shape of the mark is performed on the transfer plate by screen printing, even if the shape of the mark is complicated and its size is small, it can be carried out without particular difficulty. And
By appropriately selecting the mesh roughness of the plate for screen printing, the thickness dimension of the clear paint thin film can be arbitrarily adjusted, and as a result, the thickness dimension of the clear protective coating film can be controlled. it can. Furthermore, screen printing can reproduce the shape and dimensions of the mark accurately to form a thin film of clear paint, so that the clear protective coating film will not come out from the contour of the hot stamp foil film or the hot stamp foil surface. There is no fear that the clear protective coating film may be damaged. Further, the clear ink does not bleed unless the screen printing clear ink is selected correctly. Although the method of the present invention is a novel method that cannot be easily conceived from the prior art, it does not include special equipment or highly skilled work in terms of each of the steps. Therefore, the layering of the clear protective coating film by the method of the present invention can be carried out quickly, easily, and at low cost, and stable product quality can be obtained.

[0006]

Embodiments of the method of the present invention will now be described with reference to the accompanying drawings. FIG. 1 is a process diagram in one embodiment of a clear protective coating layer forming method according to the present invention, (A) is a schematic side view in which a screen printing process and a transfer process are combined, and (B) is a transfer process. FIG. 6C is a schematic side view of a transfer step corresponding to the next step of the taking step, and FIG. 6C is a schematic side view of a state where the transfer is completed. Reference numeral 8 shown in the above (A) is a printing screen, on which a stencil portion having the same shape and size as the mark represented by the hot stamp foil is formed, and printing ink other than the above stencil portion is used for printing ink. On the other hand, it is an impermeable shield. A clear paint 9 is placed on the screen 8. 10 is a squeegee. The clear paint 9 in the present invention is preferably a Ford cup viscometer (FC # 4) 50-60. In this example, a reactive coating material composed of acrylic polyol resin and isocyanate was used. As an example different from the present example, an acrylic UV-curable coating material may be used, or an acrylic ink may be used. The clear paint having such a property has an appropriate adhesive property, is suitable for screen printing and is also suitable for transfer. Moreover, there is a possibility that the clear paint may smear outside the contour of the hot stamp foil by bleeding or flowing. There is no such thing. Reference numeral 14 shown in FIG. 1A is a transfer plate. In this embodiment, a stainless plate was used as the transfer plate, but a glass plate or a copper plate can also be used. Set the printing screen 8 to the reciprocating arrow a
Direction and place it on the transfer plate 14, move the squeegee 10 to the right in the figure, screen-print using the clear paint 9 as a printing ink, and mark the mark on the transfer plate 14. The paint thin film 16 is formed. In the present invention, the thin film is a term used for convenience of understanding the technical content of the invention and has no particular numerical limitation. In short, it means that it is much thinner than the vertical and horizontal dimensions of the entire mark. However, the thickness of the clear paint thin film 16 can be adjusted by changing the mesh roughness of the stencil portion of the screen. As described below, this clear paint thin film 16
Is to form a clear protective layer (reference numeral 17 in FIG. C), which is the object of the invention, in the final step, and it is of great technical significance that the thickness of the clear coating thin film 16 can be adjusted. . Transfer plate 1 as described above
4 is printed with a clear paint thin film 16 in the shape of a mark, a printing screen 8 and a squeegee 10
Is retracted as indicated by a double-headed arrow b. Then, the pad 15 is moved onto the clear paint thin film 16 as indicated by an arrow c, pressed against the paint thin film 16, and then moved to a position 15 ′ apart from the transfer plate as indicated by an arrow d. The pads 15 and 15 'in the figure are the same members, but 15 represents the pad before it is pressed against the transfer plate 14 as indicated by arrow c, to which clear paint is attached. Not in a state. The pad 15 'is pressed and then transferred to the transfer plate 14 as shown by an arrow d.
Is a pad spaced apart from the transfer plate 1, and the mark-shaped clear paint thin film 16 printed on the transfer plate 14 is the transfer plate 1.
4 is picked up and attached to this pad 15 '(denoted by 16'). In this way, pad 1
5 receives the clear paint thin film from the transfer plate and becomes a pad 15 '. The synthetic resin molded product 1 shown in FIG. 1 (B).
2 is a member similar to the synthetic resin molded product 1 shown in FIG. 2 (B) illustrating a conventional example, and has a hot stamp foil layer 3 laminated on the top surface of the letter-shaped convex portion 1a. . The shape of the mark in this embodiment is the character "A" as shown in FIG. The "pad 15 'that receives and attaches the clear paint thin film 16'" described with reference to FIG. Let it press. Since the pad of this example is made of silicone rubber and is flexible, the pressure distribution in the contact surface becomes uniform when pressed, and the clear paint thin film 16 'attached to the pad 15' is hot stamped. It is evenly pressed against the foil layer 3 and adheres to the surface of the hot stamp foil layer 3.

When the pad 15 is raised (arrow f) as shown in FIG. 1 (C), the clear paint thin film remains fixed to the hot stamp foil layer 3. That is, the pad transfers the clear paint thin film 16 'to the hot stamp foil layer 3 and restores the state in which the clear paint is not adhered to complete the operation of one cycle, like the pad 15 in FIG. 1 (A). . The clear paint thin film which is fixedly transferred to the hot stamp foil layer 3 covers the hot stamp foil layer 3 and has the same shape and the same size as the mark represented by the hot stamp foil layer (with no blemishes and no defect). A clear protective layer 17 is formed.

[0008]

By applying the present invention, it is possible to screen-print a mark on a smooth transfer plate by using clear paint as a printing ink without any particular difficulty. When the pad is pressed against the thin film of clear paint printed on the transfer plate, the thin film of clear paint is transferred to the surface of the pad. In this case, since the pad is made of a flexible material, the pressure distribution on the contact surface becomes uniform even if the drive control is not performed with extremely high precision. As described above, when the pad on which the mark-shaped clear paint thin film is transferred is pressed onto the hot stamp foil film, the clear paint thin film adheres to the hot stamp foil film to form a clear protective coating film. To be done. As can be easily understood from the above-mentioned operation, the clear paint thin film transferred to the pad is transferred to the hot stamp foil film, not the screen printing directly on the hot stamp foil film. It suffices to bring the pad into contact with the hot stamp foil film, and even if there is an obstacle near the hot stamp foil film, the method of the present invention can be carried out if the pad passage exists. Further, since the operation of forming the clear paint thin film into the shape of the mark is performed on the transfer plate by screen printing, even if the shape of the mark is complicated and its size is small, it can be carried out without particular difficulty. By appropriately selecting the mesh roughness of the screen printing plate, the thickness of the clear paint thin film can be arbitrarily adjusted, and as a result, the thickness of the clear protective coating film can be controlled. be able to. In addition, screen printing can accurately reproduce the shape and dimensions of the mark to form a thin film of clear paint, so that the clear protective coating film will not come out from the contour of the hot stamp foil film.
There is no fear that the clear protective coating film may have defects on the surface of the hot stamp foil. Further, the clear ink does not bleed unless the screen printing clear ink is selected correctly. Although the method of the present invention is a novel method that cannot be easily conceived from the prior art, it does not include special equipment or highly skilled work in terms of each of the steps. Therefore, the layering of the clear protective coating film according to the method of the present invention can be carried out quickly, easily, and at low cost, and has an excellent practical effect that stable product quality can be obtained.

[Brief description of drawings]

FIG. 1 is a process diagram in one embodiment of a clear protective coating layer forming method according to the present invention, in which (A) is a schematic side view in which a screen printing process and a transfer process are combined.
(B) is a schematic side view of a transfer step corresponding to the next step of the transfer step, and (C) is a schematic side view of a state in which the transfer is completed.

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 adhered clear paint, 8 ... Screen, 9 ... Clear paint, 10 ... Squeegee, 15, 15 '... Pad, 16, 16' ... Clear paint thin film, 17 ... Clear protective layer.

Claims (1)

[Claims] 1. A method for forming a clear protective coating film on a hot stamp foil film, which is formed on a synthetic resin molded article and displays a mark, comprising the steps of: a. Screen printing the above mark on a smooth transfer plate with clear paint, b. Transfer the thin film of clear paint printed on the transfer plate by pressing the smooth surface of a pad made of a flexible material onto the thin film, c. A thin film of the clear paint transferred to a pad is pressed against the surface of the hot stamp foil film to transfer the thin film of the clear paint onto the hot stamp foil film. How to stratify.