Resin molding die and method for manufacturing the same

Abstract

This invention provides a mold for adding a readable QR code (registered trademark) to a resin molded product, and a method for manufacturing the same. [Solution] The present invention provides a resin molding mold and a method for manufacturing the mold, which make the brightness of the QR code (registered trademark) attached to a resin molded product different from the brightness of the resin molded product by forming a fine three-dimensional pattern on the QR code (registered trademark) display portion of the mold.

Description

[[Technical Field]]

[0001] The present invention relates to a mold for resin molding and a method for producing the same. More specifically, it relates to a mold for resin molding for adding a readable QR Code (registered trademark) to a resin molded product and a method for producing the same. [[Background Art]]

[0002] QR Code (registered trademark), which can contain a large amount of information, is written on various articles and in many other fields, and is widely used. However, when a QR Code (registered trademark) is added to a resin molded product, particularly an injection-molded product, by engraving or the like, it is difficult for a camera to read the QR Code because the resin molded product is made of a single material. For this reason, stickers or the like printed with a QR Code (registered trademark) have been prepared and attached to each resin molded product. Therefore, preparation of the sticker or the like and attachment of the sticker or the like require time and labor.

[0003] Accordingly, a resin molding mold for forming a three-dimensional QR Code (registered trademark) on the surface of a resin molded body and a method for producing the same have been proposed, which can save the labor of preparing such stickers and attaching the stickers (Patent Document 1). [[Prior Art Document]] [[Patent Document]]

[0004] [[Patent Document 1]] Japanese Unexamined Patent Publication No. 2024-169252

[0005] The above proposal eliminates manual work by directly forming QR Code (registered trademark) cells as a cell concavo-convex assembly with a fine area capable of presenting a large amount of information in the molding process during molding, and provides a resin molding mold incorporating a QR Code (registered trademark) pattern as a fine cell concavo-convex assembly, which is difficult to process with ordinary injection molding molds, as an engraving block, and a method for producing the same (paragraph 0006). [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0006] The present invention aims to provide a resin molding die and a method for manufacturing the same, which allows for the addition of a readable QR code (registered trademark) to a resin molded product. As a result, the preparation and application of conventional seals can be eliminated. [Means for solving the problem]

[0007] The resin molding die of the present invention is characterized by having a fine three-dimensional pattern formed on the QR code (registered trademark) display portion (Claim 1).

[0008] The inventors of the present invention concluded that the reason why QR codes attached to resin molded products are difficult to read is that the brightness, brilliance, or luminance of the resin molded product and the QR code attached to it are the same. Therefore, in order to attach a readable QR code to a resin molded product, it is necessary to make the luminance of the QR code attached to the resin molded product different from that of the resin molded product.

[0009] However, in order to assign and maintain a different brightness level for the QR code (registered trademark) on a resin molded product compared to the resin molded product itself, it was necessary to devise a special molding die for that purpose.

[0010] The inventors have discovered that forming a fine three-dimensional pattern in the QR code (registered trademark) forming portion of a molding die and that the brightness of the QR code (registered trademark) changes due to the fine irregularities caused by the formation of the fine three-dimensional pattern, and that performing resin molding using a molding die in which a fine three-dimensional pattern has been formed in the QR code (registered trademark) portion of the molding die results in the addition of fine irregularities consisting of the fine three-dimensional pattern to the resin molded product, thereby changing the brightness of the QR code (registered trademark) portion. In other words, the present invention is characterized by adding a QR code (registered trademark) with a brightness different from that of the resin molded product to the resin molded product.

[0011] Examples of the aforementioned fine three-dimensional patterns include lattice patterns, plain background patterns, and grid patterns. Possible processing methods for these fine three-dimensional patterns include laser processing, blast processing, and plain background processing.

[0012] The present invention relates to a method for manufacturing a resin molding die, characterized in that a fine three-dimensional pattern of a QR code (registered trademark) is processed on the surface of the die according to a laser processing file (Claim 2).

[0013] According to the above manufacturing method, it is possible to provide a resin molding die to which a QR code (registered trademark) that can be read quickly and accurately is attached.

[0014] The part of the micro-three-dimensional pattern to be processed includes the white part, the black part, or both parts of the QR code (registered trademark). Furthermore, it also includes the QR code (registered trademark) with the white and black parts reversed. [Effects of the Invention]

[0015] According to the present invention, a readable QR code (registered trademark) can be added to a resin molded product by using the resin molding die described above. Therefore, the preparation and application of conventional seals and the like can be eliminated. [Brief explanation of the drawing]

[0016] [Figure 1] This is a process diagram of one embodiment of the method for manufacturing a resin molding die according to the present invention. [Modes for carrying out the invention]

[0017] An example of the manufacturing method for resin molding dies of the present invention will be explained according to Figure 1.

[0018] QR code (registered trademark) creation process; recognition performance decreases with small QR codes (registered trademark), so it is preferable that each cell be 0.5 mm or larger. Four blank cells are required around the outer edge of the QR code (registered trademark), so this should be taken into consideration.

[0019] Mold CAD data step: preparing mold CAD data corresponding to the processing mold.

[0020] Mapping (pasting) step: mapping the three-dimensional micro-pattern QR Code (registered trademark) generated in the aforementioned QR Code (registered trademark) generating step onto the processing target portion of the mold CAD data. Said mapping is usually performed by UV mapping, but this operation may cause a slight change in the size of the QR Code (registered trademark). It should be noted that if planar processing is feasible, the original data can be processed directly.

[0021] Processing file creation step: creating a program for operating a laser processing machine.

[0022] Laser processing step: sending the program created in the processing file creation step to the laser processing machine, aligning the position of the mold and the data, and then proceeding to the processing step. In the case of three-dimensional processing, the QR Code (registered trademark) is processed at the mapped position; in the case of planar processing, the QR Code (registered trademark) is processed at the specified position.

[0023] Injection molding step: a readable QR Code (registered trademark) is added to an injection-molded product, which eliminates the need for post-processing such as sticking a seal on the product.

[0024] It should be noted that the resins used in the present invention include PP material, ABS material, PC+ABS material and other materials, and there is no limitation on the resin type or resin color, including black, gray, ivory, red, white and transparent.

[0025] Next, the readable QR Code (registered trademark) will be described.

[0026] A method for adding a QR Code (registered trademark) to a resin molding mold. 1. A lattice pattern with a pitch of 200 µm or less is added to the black portions of a two-dimensional QR Code (registered trademark). 2. A solid pattern with a pitch of 200 µm or less is added to the black portions of a two-dimensional QR Code (registered trademark). 3. A fine pattern with a pitch of 200 µm or less is added to the black portions of a two-dimensional QR Code (registered trademark).

[0027] Furthermore, this fine pattern can be not limited to a grid pattern, but can also be a polygon such as a triangle, pentagon, or hexagon.

[0028] A method for adding different fine three-dimensional patterns to both the black and white areas. 4. A grid pattern with a white area pitch of 200μ or less is added to the 4.2-dimensional QR code (registered trademark). 5. Add a background pattern with a pitch of 200μ or less to the white area of ​​the 5.2-dimensional QR code (registered trademark). 6. A fine pattern with a pitch of 200 μm or less is added to the white area of ​​the 6.2-dimensional QR code (registered trademark).

[0029] Furthermore, this fine three-dimensional pattern can be not limited to a grid pattern, but can also be a polygon such as a triangle, pentagon, or hexagon.

[0030] The aforementioned micro-three-dimensional QR code (registered trademark) pattern allows the camera to recognize differences in brightness, making it possible to read QR codes (registered trademark) attached to single-color resin products.

[0031] The aforementioned brightness difference is closely related to the depth of the micro-pattern; if the depth is shallow, the micro-3D QR code (registered trademark) cannot be read by the camera. The deeper the pattern, the more readable the micro-3D QR code (registered trademark) becomes by the camera. However, increasing the depth increases the processing time for the micro-3D QR code (registered trademark) pattern on the mold, resulting in disadvantages such as higher processing costs and increased processing time. Depending on the type of micro-3D pattern, the preferred depth for the micro-3D QR code (registered trademark) pattern is 30 to 300 μm. [Industrial applicability]

[0032] According to the present invention, a readable QR code (registered trademark) can be added to a resin molded product. Therefore, the time and effort required for creating and attaching conventional seals can be eliminated, and its industrial applicability is extremely high.

Claims

1. A resin molding die characterized by having a fine three-dimensional pattern formed on the QR code (registered trademark) display portion.

2. A method for manufacturing a mold for resin molding, characterized by processing a fine three-dimensional pattern of a QR code (registered trademark) onto the surface of the mold according to a laser processing file.

Images