KR101614298B1 - Manufacturing method for mold using low-glossy and anti-fouling micro-pattern transferring film for etching - Google Patents

Abstract

The present invention relates to a method of manufacturing a mold using an anti-fouling micro pattern transfer film for etching, and more particularly, to a method of manufacturing a mold using an anti-fouling micro pattern transfer film for etching, The transfer ink printing area is spaced apart from each other by an interval of 0.05 to 0.09 mm and the etching area except for the transfer ink printing area is formed as a whole using a micro pattern transfer film. By using a mold according to the production method, excellent antifouling property and low staining property can be imparted while satisfactory low glossiness is imparted to the surface of the injection molded article.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a mold using a low-gloss antifouling micro pattern transfer film for etching,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a mold using an anti-fouling micro pattern transfer film for etching, and more particularly, to a method of manufacturing a mold using a chemical etching method, To a method of manufacturing a mold using a low-gloss antifouling micro-pattern transfer film for etching which can impart excellent antifouling property and low staining property to an injection molded plastic article by further processing a micropattern.

In general, plastic injection molded articles are mainly used from the viewpoints of light weight, efficiency of mass production, easiness of processing, and the like. In the inner surface of the mold, a specific fine pattern for improving the functionality and commerciality of the injection molded article .

Conventionally, the main focus is on the stable production and management of such injection-molded products. However, as the living standards of the industry and culture have improved, it has become more and more important for consumers to understand not only the function of the product itself, The tendency to attach importance to the emotional quality such as the applied texture tends to be strengthened. Therefore, according to the tendency of the times, there is a tendency that the resin injection molding product for interior and exterior use of a vehicle such as a dashboard of a vehicle, a center fascia or a glove box, Various embossing patterns having high quality textures such as natural leather and the like have been widely applied for improving emotional quality and imparting a high quality to various resin injection molded articles such as molded articles.

However, the injection-molded product having an embossed surface as described above tends to have a high degree of contamination owing to the fine embossing shape of the outer surface thereof, and has a problem in that it is difficult to remove the contamination once it is contaminated.

In order to solve these problems, there is a method of lowering the contamination rate by improving the glossiness by treating the surface of the injection molded article with a smooth surface. However, since the improvement of the glossiness of the injection molded article gives a low feeling to the product, .

Typical conventional techniques for imparting a sense of quality to a product by lowering the gloss of an injection-molded product include the following.

Korean Unexamined Patent Application Publication No. 10-1992-7002832 (published Oct. 28, 1992) discloses a process for producing a molded article, which comprises the steps of opening a humanoid unevenness having a matte surface on which a transfer layer having fine irregularities is formed, .

However, the above-mentioned method is an in-mold decoration (IMD) method in which a laminate sheet having micro-irregularities is set in a mold and injection molding is performed. In this method, three-dimensional texture on the surface of an injection- , The durability of the surface texture is not only poor but also satisfactory in terms of the expression of the three-dimensional texture.

Korean Registered Patent No. 0868975 (registered on Nov. 10, 2008) discloses a method in which a dot-shaped fine pattern having a diameter of 0.05 to 0.2 mm is additionally etched into a mold having an embossing surface subjected to multiple etching, And forming fine protrusions having a small diameter, thereby achieving a low-gloss or matte-like shape.

However, since the micro-pattern for imparting low gloss is protruded on the embossed surface in the embossing form, the manufacturing method of the injection-molded product There is a problem that the surface is easily contaminated and the contamination is not easily removed once it is contaminated. In addition, such a low-gloss micropattern is relatively large in size, and thus the existing embossing pattern is distorted .

In particular, the embossed protruding micro pattern for imparting low glossiness has a serious problem in that it is liable to be contaminated with fine napping from a work glove when assembling an injection molding interior material in a vehicle manufacturing factory.

A typical example of a micro pattern transfer film used to etch a metal mold for producing an injection molded article having a protruding protruding micro pattern for imparting low gloss as described above is shown in FIG. 8 and FIG. 8 Referring to FIG. 9, a transfer ink is printed on the entire surface of a substrate film so that a large number of circular dot-shaped space portions having a diameter of about 0.14 mm and spaced apart from each other at regular intervals of about 0.14 mm are formed (In Fig. 8, a white portion is a transfer ink printing region for masking, and in Fig. 9, a blue region is a transfer ink printing region), so that the circular dot portion is etched in a mold at a recessed angle, As shown in Fig. 10, which is an enlarged view of the surface, and Fig. 11, which is a schematic cross-sectional view thereof, Bit portion is to be formed into a shape protruding in relief.

Korean Patent Publication No. 10-1992-7002832 (published on October 28, 1992) Korean Registered Patent No. 0868975 (registered on Nov. 10, 2008)

Accordingly, an object of the present invention is to provide a mold for a mold using an etching micro pattern transfer film, which can be effectively applied to the production of a mold capable of giving a satisfactory degree of low gloss to the surface of an injection molded article, And to provide an effective manufacturing method.

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(A) etching the embossed pattern on the inner surface of the metal mold for resin injection molding, and (B) applying the PVA, the cellophane, the PE, the PP A plurality of circular transfer printing ink areas each having a diameter of 0.05 to 0.09 mm are formed on the bottom surface of a substrate made of one kind of transparent resin film selected from the group consisting of PET, The low-gloss antifouling micro-pattern transfer film for etching having the etching areas except for the transfer ink printing area formed as a whole is connected to the surface of the metal mold for resin injection molding in which the embossed pattern is formed, Transferring the transfer ink printing area as a masking area on the substrate, and removing the substrate film; (C) And forming a low-gloss antifouling micro-pattern on the embossed pattern by etching a portion of the embossed pattern except for the area of the embossed pattern.

The low-gloss antifouling micro-pattern transfer film for etching in the above step (B) can be produced by silk screen printing of silks of 100 # to 600 #, preferably of silks of 200 # to 400 #.

The etching depth in the etching step (C) is in the range of 5 to 30 mu m.

After the step (A) or (C), the sandblasting may be performed.

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According to the method for producing a mold using the low-gloss antifouling micro-pattern transfer film for etching according to the present invention, a mold capable of imparting excellent antifouling property and low staining property to a surface of an injection molded article with satisfactory low glossiness can be effectively manufactured By using the mold according to the above-described manufacturing method, it is possible to effectively mold an injection-molded article having a surface pattern having excellent antifouling property and low staining property while having satisfactory low gloss and satisfactory degree.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic pattern diagram of a low gloss antifouling micro-pattern transfer film for etching applied to the present invention. FIG.
2 is another exemplary pattern schematic diagram of the low gloss antifouling micro-pattern transfer film for etching applied to the present invention.
3 is a comparative pattern diagram of the low gloss antifouling micro-pattern transfer film for etching.
4 is a partial enlarged photograph of the low gloss antifouling micro-pattern transfer film for etching applied to the present invention.
Fig. 5 is an enlarged view of the surface of a molded product injection-molded with a mold manufactured using the transfer film of Fig. 4, which is a comparative diagram for the case of forming and forming a low-gloss antifouling micropattern.
6 is a schematic cross-sectional view of the low-gloss antifouling micropattern formed in Fig.
Fig. 7 is a three-fold enlarged photograph of the injection molded article (left side) on which the low-gloss antifouling micropattern is formed by the mold manufactured by the manufacturing method according to the present invention and the injection molded article (right side) on which the existing low gloss micropattern is formed.
8 is a pattern schematic diagram of a conventional low-gloss micro-pattern transfer film for etching.
FIG. 9 is a partially enlarged photograph of a conventional low-gloss micropattern film for etching.
10 is an enlarged view of the surface of a molded product injection-molded with a mold manufactured using the transfer film of Fig.
11 is a schematic cross-sectional view of Fig.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Fig. 1 is a schematic pattern diagram of a low-gloss antifouling micro-pattern transfer film for etching applied to the present invention. Fig. 1 is a schematic view showing a state in which a plurality of square-shaped transcripts each having a side length of 0.08 mm on one surface of a substra- (White portions in Fig. 1) are arranged at a distance of 0.08 mm from each other, and the etching regions (gray portions in Fig. 1) except for the transfer ink printing region (white portion) In the case of the first embodiment.

In the present invention, each of the plurality of transfer ink printing areas (white areas) has a diameter of 0.04 to 1.0 mm or a length of one side, and the plurality of transfer ink printing areas are spaced apart from each other by 0.04 to 1.0 mm The length of one side of each of the transfer ink printing areas, and the mutual separation distance of each of the transfer ink printing areas may be 0.05 to 0.09 mm, respectively.

Each of the transfer ink printing areas (white areas in FIG. 1) may be a circular shape, an elliptical shape, a square shape, a rectangular shape, a diamond shape, a polygonal shape, a cross shape, or a geometric shape composed of a composite shape of these shapes.

2 is a schematic view of another preferred pattern of the low gloss antifouling micropattern film for etching applied to the present invention. In the illustrated example, a plurality of square transfer inks each having a length of 0.04 mm on one side of a substrate, (White portions in FIG. 1) are arranged at a distance of 0.04 mm from each other, and the etching regions (gray portions in FIG. 1) except for the transfer ink printing region (white portion) 2, respectively.

3 is a comparative pattern diagram of the low-gloss antifouling micro-pattern transfer film for etching. In the illustrated example, the etching regions (the gray portions in FIG. 1) except for the transfer ink printing region (white portion) However, in the case where a plurality of square transfer ink printing areas (white areas in Fig. 1) each having a length of one side of 0.12 mm are arranged on one surface of a substrate (substrae) film at a distance of 0.12 mm from each other, .

Next, Fig. 4 is an enlarged photograph of the low-gloss antifouling micro-pattern transfer film for etching applied to the present invention, in which the part of circular blue color on the photograph is the transfer ink printing area for masking and the gray area is etched.

In the illustrated example, a plurality of circular transfer ink printing areas (blue areas) each having a side length of 0.06 mm are formed to be 0.06 mm apart from each other and 0.05 mm apart from the upper and lower sides, Although the etching regions are connected to each other as a whole, the etching regions are not limited to regions formed in a straight line as shown in Figs. 1 and 2, but are defined as curved connecting regions.

Fig. 5 is an enlarged view of the surface of a molded product injection-molded from a mold manufactured using the transfer film of Fig. 4, in the case where the low-gloss antifouling micropattern is not formed on the existing embossed pattern forming surface (left side) Right) is a 15 times magnification comparison chart.

On the other hand, FIG. 6 is a schematic cross-sectional view of the surface of the mold in which the low-gloss antifouling micropattern shown in FIG. 4 is formed. In the mold, the masking area indicated by blue in FIG. 4 is left as a circular protrusion, (The same as the white part in Fig. 6), the injection-molded article has a masking region formed as a fine depressed portion contrary to the mold surface.

Therefore, in the case of Fig. 10, which is a magnification of 15 magnifications on the surface of the conventional low-gloss injection-molded article, the low-gloss micropattern is formed as the embossed projection, while the surface of the low-gloss antifouling injection- In the case of Fig. 6, which is an enlarged magnification diagram, the low-gloss antifouling micropattern is formed as a finer depressed portion.

Next, Fig. 7 is a three-fold enlarged photograph of the injection molded article (left side) formed with the low-gloss antifouling micropattern by the mold according to the manufacturing method of the present invention and the injection molded article (right side) formed with the existing low gloss micropattern.

In addition, since a variety of types of transfer ink for the above-described mold etching are well known in the art, a further description thereof will be omitted. In general, the UV inks for screen printing, the pressure-sensitive adhesive for printing, and other additives are mixed.

Further, in the present invention, the low-gloss antifouling micro pattern may be a water-transfer film such as a PVA (polyvinyl alcohol) film or a cellophane (trade name) film or a PE (cholorethylene), PP (polypropylene) Polyethylene terephthalate) or the like on a transparent film substrate to produce a transfer film according to the present invention.

The above-described low-gloss antifouling micro-pattern transfer film for etching applied to the present invention provides a pattern image through editing, correction and correction of a pattern image using a design program such as Photoshop, Illustrator, Corel Draw, or 3D Max And data of a predetermined pattern designed for etching of the mold is output to a computer film output (CTF). The length of each of the transfer ink printing areas is from 0.04 to 1 mm, Is in the range of 0.05 to 0.09 mm, but it can be variously changed by various parameters such as shape, size, and kind of natural leather pattern to be designed.

In the present invention, when the diameter and the side length and the separation distance of each of the transfer ink printing areas are less than 0.04 mm, the antifouling property and the decontamination property are improved but the glossiness is likely to be increased. Conversely, The antifouling property and the decontamination property are inferior, the glossiness is not expected to be lowered further, and the embossed background pattern may be damaged, which is also undesirable.

The data on the predetermined pattern as described above is printed on a base film as described above with a computer film printer and outputted. Then, using the outputted positive film, the low-gloss antifouling micro pattern for etching applied to the present invention A negative transfer film as a film is produced. The above negative transfer film is produced by silk screen printing using an acid-resistant transfer ink.

In the above-mentioned silk screen printing, the silk yarn constituting the printing plate has a great influence on the precision printing, and therefore silk yarns of 100-600 # are used, preferably 200-400 # silk yarns.

The base of the above negative film is also of the same type as that of the above-mentioned positive film, and its thickness is about 10 to 40 mu m.

Next, a method of manufacturing a mold using the low-gloss antifouling micro-pattern transfer film for etching according to the present invention comprises the following steps.

(A) embossing pattern forming step:

And is formed by etching an embossing pattern on the inner surface of the mold for resin injection molding.

(B) low-gloss antifouling micro pattern transfer:

The above-mentioned low-gloss antifouling micro-pattern transfer film for etching is attached to the surface of the mold for resin injection molding on which the embossing pattern is formed, the transfer ink printing area as the masking area is transferred onto the embossing pattern and the base film is removed.

(C) low-gloss antifouling micro-pattern etching step:

A portion of the masking area other than the transfer ink printing area is etched to form a low-gloss antifouling micropattern on the embossing pattern.

On the other hand, the low-gloss antifouling micro-pattern transfer film for etching used in the above step (B) may be one produced by silk screen printing of silks of 100 # to 600 #, preferably of silks of 200 # to 400 # have.

Further, in the manufacturing method of the present invention, the etching depth in the low-gloss and antifouling micropattern etching step (C) is in the range of 5 to 30 μm.

Needless to say, the sandblasting may be performed after the step (A) or (C).

For reference, a photograph of the surface of a vehicle interior material molded article formed by a mold according to the manufacturing method of the present invention is as shown in Fig.

When injection molding is carried out using a mold manufactured by the method of manufacturing a mold according to the present invention as described above, a low-gloss antifouling pattern corresponding to the low-gloss antifouling micropattern finely formed on the inner surface of the mold is applied to the surface of the injection- .

Therefore, the injection molded product formed by the mold according to the present invention using the low-gloss antifouling micro-pattern transfer film for etching applied to the present invention is excellent in antifouling property and decontamination property, It is possible to remove contamination easily due to mopping and the like even when the time does not burn well and is useful for injection molding of a resin molded product which requires high sensitivity quality and cleanliness such as automobile interior materials, mobile phones, Applicable.

Hereinafter, the present invention will be described in more detail by way of examples and comparative examples, but the present invention is not limited thereto.

Example 1:

In embodying the leather pattern pattern HL-320 basic leather pattern which is applied to the plastic material of interior plastic of H company which is a leading automobile maker in Korea, the low-gloss antifouling micro pattern as shown in Fig. 2 is formed on the embossed background pattern image And the specimen was injection-molded by using this.

Gloss Unit (GU: Gloss Unit) was measured with a gloss meter of BYK, Germany, and the surface contamination rate (degree of stain resistance) was measured using KCS-80 grass / mud of Testfabric Co., The residual rate of contamination was measured.

The results are shown in Table 1 below.

Example 2:

In implementing the leather pattern pattern HL-320 basic leather pattern of Company H, a low-gloss antifouling micropattern as shown in FIG. 3 was etched on the embossed background pattern of the basic leather pattern, and the specimen was injection molded , And the gloss, the contamination rate (degree of antifouling property) and the residual percentage of contamination were measured in the same manner as in Example 1.

The results are shown in Table 1 below.

Comparative Example 1:

In implementing the leather pattern pattern HL-320 basic leather pattern of Company H, a conventional low-gloss micropattern as shown in FIG. 8 is etched on the embossed background pattern of the basic leather pattern described above, and the specimen is injection- , And the gloss, the contamination rate (degree of antifouling property) and the residual percentage of contamination were measured in the same manner as in Example 1.

The results are shown in Table 1 below.

Comparative Example 2:

In implementing the leather pattern pattern HL-320 basic leather pattern of Company H, a low-gloss micropattern as shown in FIG. 3 was etched on the embossed background pattern of the basic leather pattern, and the specimen was injection- The gloss, the contamination rate (degree of antifouling property) and the residual percentage of contamination were measured in the same manner as in Example 1.

The results are shown in Table 1 below.

Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Evaluation standard Contamination rate (%) 22.5 20.3 36.6 28 25% or less Residual rate of contamination (%) 11.3 10.5 17.7 15.6 15% or less Glossiness (GU) 1.5 1.7 1.5 1.5 1.8 ± 0.2

From the results described above, it was found that the glossiness of each of Examples 1 and 2 and Comparative Examples 1 and 2 satisfied the rating standard of Company H, but the contamination rate and residual contamination rate were significantly higher than those of Examples 1 and 2 On the other hand, Comparative Example 1 was far less than that, and Comparative Example 2 was found to be slightly below the above-mentioned evaluation standard.

Further, in the case of Comparative Example 2 in which the low-gloss antifouling micropattern was applied, the size of each masking region was so large that the contamination rate and the residual contamination rate could not be satisfied relatively. On the other hand, in Example 2, Although the anti-fouling micropattern is too small to exhibit a very good low contamination rate and residual contamination rate, it is not satisfactory even though it is within the standard of evaluation in the implementation of low gloss.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

delete delete delete delete delete A method for manufacturing a mold using an anti-fouling micro pattern transfer film for etching comprising the steps of:
(A) etching an embossed pattern on the inner surface of the mold steel for resin injection molding;
(B) a plurality of circular protrusions each having a diameter of 0.05 to 0.09 mm on the bottom surface of a substrate made of one kind of transparent resin film selected from the group consisting of PVA, cellophane, PE, PP and PET; The low-gloss antifouling micro-pattern transfer film was embossed into a low-gloss antifouling micro-pattern transfer film in which the ink print areas were spaced apart from each other by an interval of 0.05 to 0.09 mm and the etching areas except for the transfer ink printing area were interconnected as a whole. Transferring the transfer ink printing area as a masking area onto the embossing pattern by attaching to the surface of the mold steel for injection molding with the pattern formed, and removing the substrate film; And
(C) forming a low-gloss antifouling micropattern on the embossed pattern by etching a portion except for the transfer ink printing area. 7. The method according to claim 6, wherein the low-gloss antifouling micro-pattern transfer film for etching in the step (B) is a mold using a low-gloss antifouling micro-pattern transfer film for etching produced by silk screen printing of 100 # to 600 # ≪ / RTI > The method of manufacturing a mold according to claim 6, wherein the etching depth in the etching step (C) is 5 to 30 占 퐉. The method of manufacturing a mold according to claim 6, wherein the sandblasting treatment is performed after the step (A) or (C) is performed using the low-gloss antifouling micro-pattern transfer film for etching.



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