Eyeglass components and method for forming them

Abstract

The present invention aims to provide eyeglass components and a method for forming them, which are integrally molded by combining different materials with high adhesion. [Solution] The eyeglass member 1 according to the present invention is integrally formed by injection molding a first member M1 made of a first material molded into a predetermined shape and a second member M2 made of a second material different from the first material relative to the first member M1. A coating film is formed on the surface of the first member M1 at least at the interface with the second member M2, which adheres closely to and integrates with the second material M2, and the first member M1 is integrally molded with the second member M2 via the coating film.

Description

Technical Field

[0001] The present invention relates to a spectacle member in which molding materials made of different materials are integrated and a molding method thereof.

Background Art

[0002] Conventionally, various materials such as metal materials, resin materials, and wooden materials have been used for spectacle members to improve the mechanical properties, decorativeness, and wearing comfort of the spectacle members. Further, from the viewpoints of the design and functionality of the spectacle members, the development of spectacle members in which different materials are integrated has been promoted. For example, in Patent Document 1, a temple modern having a resin sheath portion and an elastic pad portion disposed at least in a portion facing the ear of the sheath portion, and the sheath portion and the pad portion made of different materials are integrated by double molding is described.

[0003] In addition, technologies for integrating different materials such as metal materials and resin materials have been proposed. For example, in Patent Document 2, a method for manufacturing a composite having a molded body of a thermoplastic resin composition joined to a coated metal blank including a metal blank and an organic resin layer disposed on the metal blank is described.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, materials having different characteristics are combined and integrally molded, but there is a possibility that troubles such as peeling may occur at the interface where the materials contact each other during use. Particularly, when the affinity between the materials is low, the adhesive force at the interface becomes low and troubles are likely to occur.

[0006] While it has been proposed to bond materials with different properties together using adhesives, if the adhesive layer is exposed at the interface between the materials or if uneven application occurs, deterioration of the appearance of the eyeglass components is unavoidable. Furthermore, compared to integral molding by injection molding, a slight step is more likely to occur at the bonded boundary, affecting the feel and comfort of wearing the product.

[0007] Therefore, the present invention aims to provide eyeglass components and a method for forming them, which are integrally molded by combining different materials with high adhesion. [Means for solving the problem]

[0008] The eyeglass component according to the present invention is an eyeglass component integrally formed by injection molding a first component made of a first material molded into a predetermined shape and a second component made of a second material different from the first component with respect to the first component, wherein a coating film is formed on the surface of the first component, at least at the interface with the second component, which adheres and integrates with the second component, and the first component is integrally molded with the second component via the coating film. Furthermore, the coating film is formed from multiple layers, with a base layer formed on the surface side of the first component that adheres and integrates with the material of the first component, an adhesion layer formed on the surface side of the second component that adheres and integrates with the material of the second component, and an intermediate layer formed between the base layer and the adhesion layer that provides functionality and / or design. Furthermore, the coating film has sufficient adhesion to prevent peeling between it and the second component in a primary adhesion test by cut taping and an adhesion test by cut taping after a hot water test and an artificial sweat test.

[0009] The method for molding eyeglass components according to the present invention comprises a primary molding step of molding a first component using a first material, a painting step of forming a coating film on the surface of the molded first component that adheres and integrates with a second material different from the first material, and a secondary molding step of integrally molding a second component with the first component formed on the first component by injection molding using the second material. [Effects of the Invention]

[0010] In this invention, a coating film is formed on the surface of a first component made of a first material, which adheres and integrates with a second material different from the first material. The first component is integrally molded with the second component made of the second material via the coating film. This enhances the adhesion between components made of different materials, resulting in high-quality eyeglass components.

[0011] Furthermore, by combining components made of different materials, it becomes possible to realize eyeglass components with various functions, and the built-in coating can enhance both functionality and / or aesthetics. [Brief explanation of the drawing]

[0012] [Figure 1] This is an external view of an eyeglass component, which is an embodiment of the present invention. [Figure 2] This is a cross-sectional view AA in Figure 1. [Figure 3] This is an explanatory diagram regarding the molding process. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described in detail below. Figure 1 is an external view of an eyeglass member according to an embodiment of the present invention, and includes an inner side view (Figure 1(a)), a top view (Figure 1(b)), and an outer side view (Figure 1(c)). Figure 2 is a cross-sectional view of Figure 1, AA.

[0014] The temple 1, a component of eyeglasses, has a pair of hinge-forming link portions 1a at one end, and the other end is curved to form an ear hook portion 1b. The temple 1 is made of two materials, with an outer first member M1 and an inner second member M2 being combined and integrally molded.

[0015] The first component M1 is molded by injection molding or the like to conform to the overall shape of the temple 1, and a coating of a predetermined thickness is formed over its entire surface. The second component M2 is made of a material different from that of the first component M1 and is made of a material that adheres closely to and integrates with the coating formed on the surface of the first component M1, and is integrally molded inside the first component M1 via the coating by injection molding.

[0016] In this example, since a coating is formed on the entire surface of the first member M1, the coating formed on the interface between the first member M1 and the second member M2 adheres tightly to the second member M2, and the entire temple 1 is integrally molded. Note that the coating only needs to be formed on the interface between at least the first member M1 and the second member M2.

[0017] The coating should preferably be made of a material that has the property of adhering closely to and integrating with the material of the second component M2, as well as possessing excellent functionality and / or design. Examples of functionality include water repellency and self-healing properties. Examples of design features include metallic coatings that produce a metallic luster and matte coatings that produce a textured surface for a non-glossy finish. By having such a functional and / or design-enhanced coating appear on the surface of the first component M1 on the outside of the temple 1, the design and performance of the eyeglass components can be enhanced.

[0018] By forming the coating film by baking paint, a uniform thickness of coating layer can be formed without unevenness. Furthermore, it is preferable that the coating is formed by laminating multiple coating layers that have been cured by baking paint. For example, by forming a base layer on the surface side of the first component that adheres and integrates with the material of the first component, forming an adhesion layer on the surface side of the second component that adheres and integrates with the material of the second component, and forming an intermediate layer between the base layer and the adhesion layer that provides the aforementioned functionality and / or design, it becomes possible to obtain high-quality eyeglass components with enhanced functionality and / or design by combining various materials of the first and second components.

[0019] By constructing Template 1 by combining members made of a plurality of different materials, it is possible to accommodate a wide range of shapes and designs from the viewpoints of strength characteristics and weight reduction. For example, by combining a high-strength resin material with a lightweight and flexible material, it is possible to accommodate a thick design while ensuring strength. And, by using a member made of a material with a good touch on the inside member of Template 1, it becomes possible to select a material with a good wearing feeling separately from the outer members, and it is possible to manufacture spectacle members corresponding to a wide range of needs.

[0020] Regarding the combination of materials of the first member and the second member, for the material of the second member, a resin material capable of injection molding is used. By forming a coating film on the surface of the first member that adheres and integrates with the resin material of the second member, various materials other than resin materials can be used for the material of the first member. For example, in addition to the combination of a resin material and a resin material, a combination of a resin material and a metal material can be mentioned.

[0021] In the case of the combination of a resin material and a resin material, for example, when polyphenylsulfone (PPSU) is used for the first member and a styrene-based elastomer is used for the second member, by using an acrylic-based paint as the coating film, the first member and the second member can be integrally formed by adhesion.

[0022] In the case of the combination of a resin material and a metal material, for example, when stainless steel is used as the metal material for the first member and a styrene-based elastomer is used for the second member, by using an acrylic-based paint as the coating film, the first member and the second member can be integrally formed by adhesion.

[0023] Figure 3 is an explanatory diagram regarding the molding process. The molding process includes a primary molding process for molding the first member (Figure 3(a)), a painting process for forming a coating film on the surface of the first member (Figure 3(b)), and a secondary molding process for molding the second member by injection molding with respect to the first member (Figure 3(c)).

[0024] In the primary molding process, a first member M1 is formed using a first material by a known molding method such as injection molding. In the painting process, a multi-layer coating C is formed on the entire surface of the molded first member by baking paint. For example, a base layer is formed on the surface of the first member by baking paint, and an intermediate layer having functionality and / or aesthetic appeal is formed on the surface of the base layer by baking paint. Then, an adhesion layer that adheres and integrates with a second material different from the first material is formed on the surface of the intermediate layer by baking paint, forming a coating C that adheres and integrates with the second member.

[0025] In the secondary molding process, the first member M1, on which the coating film has been formed, is placed in the mold, and the second member M2 is integrally molded onto the surface of the adhesion layer by insert molding using a second material. In this example, the first member M1 is exposed on the outer surface of the molded eyeglass member, and the second member M2 is exposed on the inner surface. Since the coating film C is exposed on the surface of the first member M1, the functionality and / or design of the coating film C can be provided on the outer surface of the eyeglass member, and the second member M2, made of a different material from the first member M1, is exposed on the inner surface that comes into contact with the skin when the eyeglass member is worn, thereby providing a good wearing experience. [Examples]

[0026] The present invention will be further described in detail below with reference to examples, but the present invention is not limited in any way to these examples.

[0027] The following tests were conducted to confirm the adhesion of the test specimens. When performing adhesion tests on molded test specimens as they were, the "primary adhesion test using cut taping" was performed.

[0028] <Adhesion test using cut taping> For a test specimen in which a second component is integrally molded with a first component via a coating, a cross-shaped cut (line length 0.5 cm) is made on the surface where the second component is exposed using a single-blade cutter (Olfa Corporation), penetrating the coating and reaching the surface of the first component. Adhesive tape (Nichiban Corporation, length 4 cm x width 1.8 cm) is then applied to the surface with the cuts so as to cover the cuts.

[0029] The adhesive tape should be applied tightly to the cut surface to prevent air from getting trapped, and one end should be held upright at a 90-degree angle to the surface, with a length of 1 cm from the end.

[0030] Next, the lifted end is instantly pulled up to instantly detach the adhesive tape from the test specimen. The presence or absence of peeling of the coating within the cut is visually checked and evaluated.

[0031] <Hot water test> Pour 500 ml of distilled water into a beaker, cover it with commercially available plastic wrap, and place it in a bath of 80°C hot water. Once the distilled water has heated to 80°C, place the test specimen in the beaker and immerse it. After immersion for 1 hour, remove the test specimen and dry it by blowing air onto it. After letting the dried test specimen stand for 30 minutes, perform an adhesion test using cut tape and evaluate the results.

[0032] <Artificial sweat test> Place 100g of sodium chloride (manufactured by Kanto Chemical Co., Ltd.) and 50g of lactic acid (manufactured by Kanto Chemical Co., Ltd.) in a beaker, add a small amount of distilled water and stir thoroughly until dissolved, then add more distilled water to make a total volume of 1000 ml and stir thoroughly to prepare the artificial sweat solution.

[0033] Pour the prepared artificial sweat solution into a glass container and set the depth to 10 mm from the bottom. Place the test specimen on a support frame set up inside the glass container, and set the lowest part of the test specimen to be 15 ± 3 mm above the liquid surface.

[0034] The glass container is sealed with plastic wrap and placed in a drying oven (manufactured by Isuzu Manufacturing Co., Ltd.), with the internal temperature set to 55±5℃, and dried for 24 hours.

[0035] After drying, the test specimens are removed from the dryer, washed with tap water to remove the artificial sweat solution, and then dried by blowing air onto them. After leaving the dried test specimens for 30 minutes, the degree of whitening, peeling, and discoloration is visually checked, and an adhesion test is performed using cut tape for evaluation.

[0036] [Example 1] A first component (14 cm long x 0.8 cm wide x 0.5 cm thick) was molded using a resin material made of polyphenylsulfone (PPSU) (manufactured by BASF) in an injection molding machine (Sodick Co., Ltd., GL-100) at a molding temperature of 380°C. The molded first component was then polished for 10 minutes in a barrel polishing machine (Chipton Co., Ltd.) to shape its surface.

[0037] Next, a coating was formed on the surface of the first component. First, the first component was cleaned and degreased using a cleaning machine (manufactured by M.K. Science Co., Ltd.). Then, a primer paint (manufactured by Kubotaka Paint Co., Ltd., W-POWER) was applied to the surface of the first component and baked at 175°C to form a base layer with a thickness of 0.003 to 0.005 mm.

[0038] An acrylic paint (E Metallic II, manufactured by Kubotaka Paint Co., Ltd.) was applied to the surface of the base layer and baked at 175°C to form an intermediate layer with a thickness of 0.01 mm. Furthermore, an acrylic paint (Acrol Clear K80, manufactured by Kubotaka Paint Co., Ltd.) was applied to the surface of the intermediate layer and baked at 175°C to form another intermediate layer with a thickness of 0.01 mm.

[0039] An acrylic paint (KS-Flex Clear, manufactured by Kubotaka Paint Co., Ltd.) was applied to the surface of the intermediate layer and baked at 175°C to form a 0.01 mm adhesion layer.

[0040] The formed coating has an intermediate layer that provides a metallic-like appearance, and an adhesion layer that enhances adhesion to the second component.

[0041] Next, the first component with the coating film formed on it was set in the mold of the injection molding machine described above, and insert molding was performed at a molding temperature of 220°C using a resin material made of styrene elastomer (AR-BOIX-60, manufactured by Aron Kasei Co., Ltd.) to form a second component (length 14.2 cm × width 0.62 cm × thickness 0.35 cm) that was tightly integrated with one side of the first component, thereby obtaining a test specimen. In the obtained test specimen, a coating film with aesthetic appeal was exposed on one side of the first component, and the elastomer was exposed on the other side where the second component was molded, providing other functions such as flexibility.

[0042] Regarding the test specimens, a primary adhesion test using cut taping, as well as adhesion tests using cut taping after hot water tests and artificial sweat tests, were performed. In all tests, no delamination occurred between the coating film within the cut and the second component. In this case, it is considered that during insert molding, the surface of the adhesion layer uniformly heat-fused to the surface of the second component, resulting in a highly strong, integrated bond.

[0043] [Example 2] Similar to Example 1, a first component with a coating film formed on it was set in the mold of an injection molding machine, and insert molding was performed using a polyester thermoplastic elastomer (Mitsubishi Chemical Corporation, A1500N) at a molding temperature of 220°C to form a second component that was tightly integrated with the first component, similar to Example 1, and a test specimen was obtained.

[0044] Regarding the test specimens, a primary adhesion test using cut taping, as well as adhesion tests using cut taping after hot water tests and artificial sweat tests, were performed. In all tests, no delamination occurred between the coating film within the cut and the second component. In this case, it is considered that during insert molding, the surface of the adhesion layer uniformly heat-fused to the surface of the second component, resulting in a highly strong, integrated bond.

[0045] [Comparative Example] Similar to Example 1, a PEI (polyetherimide) adhesive was applied to the interface surface of the first member and the second member to a thickness of 0.1 mm. Then, insert molding was performed in the same manner as in Example 1, and the second member, which was tightly integrated with the first member, was molded to obtain a test specimen.

[0046] Regarding the test specimens, a primary adhesion test using cut taping, and adhesion tests using cut taping after hot water tests and artificial sweat tests were performed. In the primary adhesion test, no delamination occurred between the coating film in the cut and the second component. However, after the hot water test and artificial sweat test, it was confirmed that delamination occurred between the coating film in the cut and the second component.

[0047] When adhesive was applied to the interface between the first and second components, adhesion was ensured in the initial stage, but under various environmental conditions, the adhesion decreased, confirming that the adhesive layer formed at the interface was affected. In contrast, when the second component was integrally molded to the first component via a coating film, adhesion was maintained under various environmental conditions, and high-quality eyeglass components were obtained. [Explanation of Symbols]

[0048] 1... Eyeglass component, M1... First component, M2... Second component, C... Coating film

Claims

1. An eyeglass member comprising a first member made of a first material molded into a predetermined shape, and a second member made of a second material different from the first material integrally molded with the first member by injection molding, wherein a coating film is formed on the surface of the first member, at least at the interface with the second member, which adheres closely to and integrates with the second material, and the first member is integrally molded with the second member via the coating film.

2. The spectacle member according to claim 1, wherein the coating film is formed from multiple layers, a base layer is formed on the surface side of the first member that adheres closely to and integrates with the material of the first member, an adhesion layer is formed on the surface side of the second member that adheres closely to and integrates with the material of the second member, and an intermediate layer is formed between the base layer and the adhesion layer to provide functionality and / or design.

3. The spectacle member according to claim 1 or 2, wherein the coating film has sufficient adhesion to prevent delamination from occurring between it and the second member in a primary adhesion test by cut taping and an adhesion test by cut taping after a hot water test and an artificial sweat test.

4. A method for molding eyeglass components, comprising: a primary molding step of molding a first component using a first material; a painting step of forming a coating film on the surface of the molded first component that adheres and integrates with a second material different from the first material; and a secondary molding step of integrally molding a second component onto the first component on which the coating film has been formed by injection molding using the second material.

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