Slider for slide fastener and slide fastener

Abstract

The present invention relates to a slider for a slide fastener and a slide fastener, and provides a lock pin for a slide fastener in a state of sufficient adhesion strength using a lower manufacturing cost means, the lock pin being elaborately designed to present an integrated blackening without a sense of incongruity with peripheral components. In a slider for a slide fastener provided with a slider body, a pull tab, and lock pins, the lock pins (21, 31) are made of a stainless steel material, a black oxide film is formed on the surface of each lock pin, and the surface of each lock pin has a lightness L * of 31.70 < = L * < = 35.90 and a * value of-0.708 < = a * < = 1.929, said lightness L * being defined in a CIELAB color space defined in JIS Z 8781-4 (2013). Furthermore, the difference [delta] L * between the lightness L * of the slider bodies (23, 33) and the lightness L * of the lock pins (21, 31) is [delta] L * < = 8.54, and the difference [delta] a * between the values of a * is 0.03 < = [delta] a * < = 2.67. In addition, the thickness of the oxide film on the surface of the lock pin is 320 nm or more and 1870 nm or less.

Description

TECHNICAL FIELD

[0001] The present application relates to a slider for a slide fastener, and particularly to a slider with a black locking pin and a slide fastener. BACKGROUND

[0002] As one form of a slider for a slide fastener, there is a slider for a slide fastener having a function of stopping the slider from moving up and down unintentionally by engaging a locking claw with a chain dent according to an operation state of a pull tab, and they are sometimes called a slider for a slide fastener with an automatic stop device, or sometimes called an automatic locking slider. Among the sliders for a slide fastener with an automatic stop device, there is a slider for a slide fastener with an automatic stop device of a type having a component (hereinafter referred to as a "locking pin") that integrates a locking claw for engaging with a chain dent to stop the slider and a plate spring for moving the locking claw between a locking position and a locking release position. For example, it is a slider like Patent Literature 1, Patent Literature 2.

[0003] The slider of Patent Literature 1 is a slider having a shape configuration suitable for manufacturing a slider main body by zinc die casting, and the slider of Patent Literature 2 is a slider having a shape configuration suitable for manufacturing a slider main body by press working of a copper-zinc alloy. The slider for a slide fastener with a locking pin that integrates a locking claw and a plate spring like Patent Literature 1, Patent Literature 2 is sometimes called a "semi-automatic slider" or a "semi-automatic locking slider", and is called a "semi-automatic slider" or simply a "slider" in this specification.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: International Publication No. 2016-092637

[0007] Patent Literature 2: Japanese Patent Application Laid-Open No. 2002-010808

[0008] In such a semi-automatic slider, since the locking pin needs to have sufficient strength to maintain a locking state and high durability to repeated elastic deformation, a stainless steel material is widely used.

[0009] Moreover, this type of semi-automatic slider has been widely used as a slider for a fly of a garment such as a pair of jeans, a jacket, and the like, because it can simply prevent the zipper from being accidentally opened. Moreover, in the case of use for such a garment use, in the slider of the type of Patent Document 1, zinc die casting has been widely used to manufacture the slider body, and the original color of the zinc material has been directly used as a color tone close to silver. In addition, in the case of using a copper-zinc alloy such as red brass, yellow brass, or the like, for the material of the slider body and the pull tab in the garment use such as a pair of jeans, the original color of the copper-zinc alloy has been widely directly used as a color tone close to gold, or the surface has been subjected to copper-tin plating to make it silver.

[0010] In the case of such a garment use, since the original color of the locking pin made of stainless steel is a silver color tone, in the case where the color of the slider body is a gold color tone, it is used after the process of matching the color tone to the gold color tone by oxidizing the locking pin made of stainless steel by heat treatment in air. In addition, in the case where the color of the slider body is silver, the locking pin whose color tone is a gold color tone by oxidizing by heat treatment in air as described above is subjected to pickling to restore it to the original color of silver, whereby the original silver color of the locking pin is effectively used. The semi-automatic slider has been often used as described above in the past, but in recent years, there has been a demand to also use the semi-automatic slider for a bag or the like, and in that case, as the color of the slider, in addition to the gold color and the silver color of the past, a black color which is a color often used for bags or the like is also required.

[0011] Here, when the semi-automatic puller is blackened, although it is black in general, in reality, according to the difference in the absorption rate and the reflection rate of visible light, the black color is not a single fixed color, but there are various kinds of black colors. Also, with respect to the locking pin made of stainless steel, the puller main body is not made of stainless steel, and since the two components are assembled after being processed as different components, the black color of the two components is not exactly the same, and sometimes the visual effects of the two components also differ. In particular, in recent years, sometimes the whole is desired to be unified as a product of so-called pure black color which is also black but has a lower reflection rate and a higher absorption rate of visible light, and in this case, when only a part of the components is not the so-called pure black color, no matter how small the part is, since the black color of the part looks different from the pure black color of the whole of the product, sometimes an unfavorable impression is also given in appearance. In addition, in the case where the slide fastener is used for diving suits or hunting clothes, when there is a difference in color tone with respect to the whole of the product of pure black color, the small component is very conspicuous, or it is very conspicuous by reflecting visible light at a specific angle, whereby a shark or a wild animal of a dangerous species can react and approach, not only the appearance is not good, but sometimes the use of the slide fastener is also limited.

[0012] The subtle difference in color tone does not occur only in black, but also in colors such as gold and silver in the past, but in the case of colors such as gold and silver which are composed of reflected light having a strong directivity, it is natural that the visual effect or the luster effect looks different according to the reflection angle of light, and therefore, even if the color of the puller main body and the color of the locking pin somewhat differ in visual effect, it is difficult to produce a sense of discord, but in the case of colors which are presented by absorbing visible light such as black, sometimes the color difference due to the degree of black is felt to be conspicuous. SUMMARY

[0013] Here, when the locking pin made of stainless steel is blackened, plating or painting is an option as a means, but in the case of plating, in order to form a black plating layer having sufficient adhesion on the stainless steel material, it is necessary to apply several base treatment layers on the stainless steel base material, and therefore, there is an unfavorable aspect that the manufacturing process becomes complicated and the manufacturing cost also increases. In addition, in the case of painting, it is also necessary to consider the disadvantage that the locking pin is a component which is subjected to strong friction or elastic deformation, and there is a problem of peeling.

[0014] The present invention is an invention that has obtained an idea in view of a sense of incongruity of a person from a subtle color difference of the black component part, and aims at providing a lock pin of a slide fastener that is carefully designed to be integrated with no sense of incongruity with the surrounding component parts, using a means with a lower manufacturing cost and in a state with sufficient joint strength.

[0015] The puller for slide fastener of the present invention has the following features in order to achieve the above-mentioned object.

[0016] A puller for slide fastener (20, 30) characterized by comprising a puller main body (23, 33), a pull tab (25, 35), and a lock pin (21, 31), the lock pin (21, 31) being made of a stainless steel material, a black oxide film being formed on a surface of the lock pin (21, 31), a value of L* being 31.70 ≤ L* ≤ 35.90 and a value of a* being -0.708 ≤ a* ≤ 1.929 in a CIELAB color space defined by JIS Z8781-4 (2013) on the surface of the lock pin (21, 31).

[0017] Further, the puller for slide fastener is characterized in that a value of b* is -2.428 ≤ b* ≤ 0.466 in the CIELAB color space defined by JIS Z8781-4 (2013) on the surface of the lock pin (21, 31).

[0018] Preferably, the stainless steel material of the lock pin (21, 31) is an austenitic stainless steel material containing 10 to 14% of nickel in terms of weight percentage, a value of L* is 31.70 ≤ L* ≤ 34.16, a value of a* is 0.369 ≤ a* ≤ 1.736, and a value of b* is -2.428 ≤ b* ≤ 0.466 in the CIELAB color space defined by JIS Z8781-4 (2013) on the surface of the lock pin (21, 31).

[0019] Alternatively, the stainless steel material of the lock pin (21, 31) is an austenitic stainless steel material containing 13 to 17% of manganese in terms of weight percentage, a value of L* is 33.04 ≤ L* ≤ 35.90, a value of a* is -0.708 ≤ a* ≤ 1.929, and a value of b* is -2.388 ≤ b* ≤ -1.495 in the CIELAB color space defined by JIS Z8781-4 (2013) on the surface of the lock pin (21, 31).

[0020] Further, preferably, the pull head for slide fastener is characterized in that the pull head body (23, 33) is black, the difference AL* between the lightness L* of the pull head body (23, 33) and the lightness L* of the locking pin (21, 31) is AL* ≤ 8.54, and the difference Da* between the value of a* of the pull head body (23, 33) and the value of a* of the locking pin (21, 31) is 0.03 ≤ Da* ≤ 2.67, in the CIELAB color space defined in JIS Z8781-4 (2013).

[0021] Further, in the case where the stainless steel material of the locking pin (21, 31) is an austenitic stainless steel material containing 10 to 14% of nickel in terms of weight percentage, preferably, the pull head body (23, 33) is black, the difference AL* between the lightness L* of the pull head body (23, 33) and the lightness L* of the locking pin (21, 31) is AL* ≤ 6.79, and the difference Da* between the value of a* of the pull head body (23, 33) and the value of a* of the locking pin (21, 31) is 1.11 ≤ Da* ≤ 2.47, in the CIELAB color space defined in JIS Z8781-4 (2013).

[0022] Further, in the case where the stainless steel material of the locking pin (21, 31) is an austenitic stainless steel material containing 10 to 14% of nickel in terms of weight percentage, preferably, the pull head body (23, 33) is black, the difference AL* between the lightness L* of the pull head body (23, 33) and the lightness L* of the locking pin (21, 31) is AL* ≤ 6.79, and the difference Da* between the value of a* of the pull head body (23, 33) and the value of a* of the locking pin (21, 31) is 1.11 ≤ Da* ≤ 2.47, in the CIELAB color space defined in JIS Z8781-4 (2013).

[0023] Further, also preferred is a slide fastener provided with the pull head for slide fastener described above, in which the fastener element of the slide fastener is made of a ferritic stainless steel material, the lightness L* of the fastener element is 29.67 ≤ L* ≤ 36.24, the value of a* is -0.63 ≤ a* ≤ 0.76, and the value of b* is 0.42 ≤ b* ≤ 1.22, in the CIELAB color space defined in JIS Z8781-4 (2013).

[0024] In this case, more preferably, the pull head body (23, 33) is black, the difference AL* between the lightness L* of the fastener element and the lightness L* of the pull head body (23, 33) is AL* ≤ 8.94, and the difference Da* between the value of a* is 0.11 ≤ Da* ≤ 1.49, in the CIELAB color space defined in JIS Z8781-4 (2013).

[0025] Further, the puller for slide fastener in the embodiments of the present application is characterized in that the thickness of the oxide film on the surface of the locking pin (21, 31) is 320 nm or more and 1870 nm or less.

[0026] In several embodiments, the stainless steel material of the locking pin (21, 31) is an austenitic stainless steel material containing 10% or more and 14% or less of nickel in terms of weight percentage, and the thickness of the oxide film on the surface of the locking pin (21, 31) is 320 nm or more and 1260 nm or less.

[0027] Further, in other several embodiments, the stainless steel material of the locking pin (21, 31) is an austenitic stainless steel material containing 13% or more and 17% or less of manganese in terms of weight percentage, and the thickness of the oxide film on the surface of the locking pin (21, 31) is 440 nm or more and 1870 nm or less.

[0028] Furthermore, in the slide fastener using the puller for slide fastener in the embodiments of the present application, the thickness of the oxide film of the fastener element of the slide fastener is preferably 1010 nm or more and 2700 nm or less.

[0029] Effects of the Invention

[0030] According to the configuration of the puller for slide fastener of the present application, even in the case where the user wants to have a low reflectance and a high absorptance of black color as the slide fastener using product, the black color of the puller for slide fastener does not cause a sense of incongruity in the entire slide fastener using product. Furthermore, compared with the case where the black color is formed by plating means, the manufacturing cost is controlled. Further, the problem of the adhesion of the coloring layer generated in the painting means is also improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a perspective view of the puller for slide fastener of the first embodiment of the present application.

[0032] Figure 2 is a view for explaining three components constituting the puller for slide fastener of the first embodiment of the present application in an exploded state.

[0033] Figure 3 is a perspective view of the puller for slide fastener of the second embodiment of the present application.

[0034] Figure 4 is a view for explaining three components constituting the puller for slide fastener of the second embodiment of the present application in an exploded state.

[0035] Figure 5 is a schematic view showing the case where an oxide film is formed on the surface of the locking pin of the puller for slide fastener of the present application.

[0036] Figure 6 is a graph showing the results obtained by analyzing the distribution of the metal elements contained in the black oxide film formed on the surface of the locking pin of Example 1-16 in the depth direction using Auger electron spectroscopy.

[0037] Figure 7 is the same as the above, and is a graph of Example 1-17.

[0038] Figure 8 is the same as the above, and is a graph of Example 1-18.

[0039] Figure 9 is the same as the above, and is a graph of Example 1-19.

[0040] Figure 10 is the same as the above, and is a graph of Example 1-20.

[0041] Figure 11 is the same as the above, and is a graph of Example 1-21.

[0042] Figure 12 is the same as the above, and is a graph of Example 2-16.

[0043] Figure 13 is the same as the above, and is a graph of Example 2-17.

[0044] Figure 14 is the same as the above, and is a graph of Example 2-18.

[0045] Figure 15 is the same as the above, and is a graph of Example 2-19.

[0046] Figure 16 is the same as the above, and is a graph of Example 2-20.

[0047] Figure 17 is the same as the above, and is a graph of Example 2-21.

[0048] Figure 18 is the same as the above, and is a graph of Comparative Example 1-2.

[0049] Figure 19 is the same as the above, and is a graph of Comparative Example 1-3.

[0050] Figure 20 is the same as the above, and is a graph of Comparative Example 2-2.

[0051] Figure 21 is the same as the above, and is a graph of Comparative Example 2-3.

[0052] Figure 22Similar to the above, here is a chart for Comparative Example 3.

[0053] Figure 23 This is a graph showing the results of analyzing the distribution of metal elements in the black oxide film formed on the surface of the zipper teeth of Examples 3-16 in the depth direction using Auger electron spectroscopy.

[0054] Figure 24 Similar to the above, these are the diagrams for Examples 3-17.

[0055] Figure 25 Similar to the above, these are the diagrams for Examples 3-18.

[0056] Figure 26 Similar to the above, these are the diagrams for Examples 3-19.

[0057] Figure 27 Similar to the above, these are the diagrams for Examples 3-20.

[0058] Figure 28 Similar to the above, these are the diagrams for Examples 3-21.

[0059] Explanation of reference numerals in the attached figures

[0060] 20, 30: Pull the puller

[0061] 21, 31: Locking pins

[0062] 23, 33: Main body of the zipper pull

[0063] 25, 35: Film Analysis Detailed Implementation

[0064] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0065] Figure 1 This is a perspective view of the zipper pull 20 according to the first embodiment of the present invention. Figure 2 As shown, the zipper pull 20 has at least three components: a locking pin 21, a zipper pull body 23, and a pull tab 25. Figure 1 The slider body 23 of the type 20 is a slider with a shape suitable for manufacturing using zinc material by die casting. The locking pin 21 is made of stainless steel because it needs sufficient strength to maintain the slider 20 in a locked position and sufficient durability to withstand repeated elastic deformation. The pull tab 25 is made of a suitable material such as zinc or a copper-zinc alloy. These locking pins 21, slider body 23, and pull tab 25 are manufactured as different components in different processes. Then, the pull tab 25 is riveted onto the slider body 23, and the locking pin 21 is attached to the body 23, thereby obtaining the finished slider 20.

[0066] In the present embodiment, in the manufacturing process of each of the lock pin 21, the puller main body 23, and the pull tab 25, the lock pin 21, the puller main body 23, and the pull tab 25 are each subjected to coloring treatment to exhibit a black appearance. The main body 23 is preferably colored black by painting. Also with respect to the pull tab 25, the metal portion can be colored by painting, and as needed, the entire pull tab can be provided as a black rubber pull tab by integrally molding a black rubber material around the metal portion. Note that, with respect to the puller main body 23 and the pull tab 25, coloring to black can also be performed by plating or chemical conversion treatment, rather than by painting. With respect to the lock pin 21, coloring to black is performed by chemical conversion treatment, although coloring to black can also be performed by painting or plating. The black coloring treatment of this lock pin 21 is described in more detail later.

[0067] Figure 3 is a perspective view of a puller 30 for a slide fastener according to a second embodiment of the present application. As shown in Figure 4 , the puller 30 includes at least three components, a lock pin 31, a puller main body 33, and a pull tab 35. The Figure 3 puller main body 33 of the puller 30 of this type has a shape configuration suitable for manufacture by press working of a copper-zinc alloy. The lock pin 31 is manufactured from a stainless steel material because it is required to have sufficient strength for maintaining the stopped locked state of the puller 30 and high durability against repeated elastic deformation operation. The pull tab 35 is manufactured from a suitable material such as a copper-zinc alloy. These lock pin 31, puller main body 33, and pull tab 35 are manufactured as different components by different processes, and then the puller 30 as a finished product is obtained by mounting the pull tab 35 and the lock pin 31 on the puller main body 33.

[0068] In the second embodiment of the present application as well, in the manufacturing process of each of the lock pin 31, the puller main body 33, and the pull tab 35, the lock pin 31, the puller main body 33, and the pull tab 35 are each subjected to coloring treatment to exhibit a black appearance. The main body 33 and the pull tab 35 are preferably colored black by plating, but can also be colored black by painting or chemical conversion treatment. With respect to the lock pin 31, coloring is performed by chemical conversion treatment, although coloring can also be performed by plating or painting.

[0069] Note that, as described above Figure 1 to Figure 4 , the puller 20, 30 including at least three components is sometimes referred to as a "semi-automatic puller" or a "semi-automatic lock puller", but in the present specification, it is simply described as "puller 20, 30".

[0070] Next, the blackening treatment of the lock pin 21, 31 in the embodiment of the present application will be described.

[0071] In the case where the lock pin 21, 31 made of stainless steel is desired to be blackened with respect to the black-colored puller body 23, 33, as a blackening means of the lock pin 21, 31, painting, plating, chemical conversion treatment and the like can be considered. However, in the case where the blackening treatment of the lock pin 21, 31 made of stainless steel is performed by painting, since the lock pin is a member which is repeatedly elastically deformed and is a component which is subjected to strong friction due to contact with the metal of the pull tab or washing and the like, the painting is easily peeled off, and a defect in the quality of long-term use is easily caused. In addition, in the case where the blackening treatment of the lock pin 21, 31 made of stainless steel is performed by plating, since it is difficult to directly stack a black plating layer in a state of good adhesion on the stainless steel base material, it is necessary to perform several layers of base plating for improving the adhesion, and there is a disadvantage that the manufacturing cost is increased. In addition, in either painting or plating, if a black color having a low reflectance and a high absorbance of visible light is desired to be obtained, it is also necessary to thicken the painting film thickness or the plating film thickness, and there is a disadvantage that the texture of the lock pin as a raw material of stainless steel is lost due to the coating film. For such a reason, in the present application, the oxide film is formed by chemical conversion treatment in the blackening treatment of the lock pin 21, 31.

[0072] Figure 5 is a schematic view showing the case where the oxide film is formed on the surface of the lock pin 21, 31 of the puller for a slide fastener of the present application. The oxide film 53 is formed on the surface of the base material 51 of the lock pin 21, 31.

[0073] Hitherto, the blackening of the lock pin 21, 31 by chemical conversion treatment has also been attempted, and it is possible to blacken it in a relatively simple process. As such a chemical conversion treatment, the following method is widely used: after pretreatment processes such as polishing, heat treatment, and removal of a naturally formed oxide film, an oxide film is formed by immersing a component which is processed by punching from a stainless steel material in an acidic solution (a solution of chromic acid series) or an alkaline solution (a solution of caustic soda series), and washing and drying are performed as post-treatment.

[0074] However, even the oxide film obtained by the chemical conversion treatment, according to the state of the oxide film, according to the angle at which the locking pin 21, 31 is observed, there is a case in which the color tone is not a perfect black color (black color exhibited by an object that has completely absorbed visible light) but a color that looks like a brownish color due to reflection of a part of the visible light. In that case, according to the observation angle, the black color of the slider use product (bag, clothes, etc.) and the black color of the slider main body 23, 33 and the black color of the locking pin 21, 31 do not look the same black color, and a sense of incongruity is generated in the appearance. The reason for this is that the reflection of the visible light is not sufficiently suppressed to a color close to a perfect black color, and in addition, the oxide film is not thickened to a degree at which the visible light is sufficiently absorbed to a color close to a perfect black color. Therefore, in the present application, the oxide film is formed to a thickness that is not possessed by the locking pin 21, 31 of the conventional chemical conversion treatment, a thickness at which the reflection of the visible light is sufficiently suppressed to a color close to a perfect black color.

[0075] Next, the measurement results of the locking pin 21, 31 in the embodiment of the present application with respect to the lightness and the hue are described.

[0076] As the evaluation means of the degree of black color of the slider 20, 30 and the locking pin 21, 31 in the embodiment of the present application, the values of a* and b* and the value of L* in the CIELAB color space prescribed in JIS Z8781-4 (2013) were used. Here, a* and b* are the hue prescribed in the CIELAB color space prescribed in JIS Z8781-4 (2013), a* represents the hue of the magenta-green color system (+ represents a bias toward magenta, - represents a bias toward green), and b* represents the hue of the yellow-blue color system (+ represents a bias toward yellow, - represents a bias toward blue). In addition, L* represents the lightness prescribed in the CIELAB color space prescribed in JIS Z8781-4 (2013), and the greater the value, the higher the gloss. Note that the color measurement was performed using an RTC-21 manufactured by Ikanos Corporation. The light source was LED illumination.

[0077] Examples 1-1 to 1-15 shown in Table 1 are locking pins 21, 31 in the embodiments of the present application manufactured from a nickel-based austenitic stainless steel material containing 10 to 14% of nickel, and more specifically, locking pins 21, 31 in the embodiments of the present application manufactured from a nickel-based austenitic stainless steel material containing 12% by weight of nickel, 20% by weight of chromium, and 3% by weight of manganese. The appearances of Examples 1-1 to 1-15 are all deep black, and there is little change in visual effects due to the angle of light reflection. As for these Examples 1-1 to 1-15, the measurement results of the values of lightness L*, the values of a*, the values of b*, and the comparison results with the values of lightness L*, the values of a*, the values of b* of the puller body 23, 33 are shown in Table 1.

[0078] Note that the "lightness difference ΔL* from the body" indicates the value obtained by subtracting the lightness L* of the puller body from the measured value of lightness L* of each example, the "color difference Δa* from the body" indicates the value obtained by subtracting the measured value of a* of the puller body from the measured value of a* of each example, and the "color difference Δb* from the body" indicates the value obtained by subtracting the measured value of b* of the puller body from the measured value of b* of each example (the same applies hereinafter in Table 2, Table 3, and Table 4).

[0079] Examples 2-1 to 2-15 shown in Table 2 are locking pins 21, 31 in the embodiments of the present application manufactured from a manganese-based austenitic stainless steel material containing 13 to 17% of manganese, and more specifically, locking pins 21, 31 in the embodiments of the present application manufactured from a manganese-based austenitic stainless steel material containing 15% by weight of manganese, 4% by weight of nickel, and 17% by weight of chromium. The appearances of Examples 2-1 to 2-15 are all deep black, and there is little change in visual effects due to the angle of light reflection. As for these Examples 2-1 to 2-15, the measurement results of the values of lightness L*, the values of a*, the values of b*, and the comparison results with the values of lightness L*, the values of a*, the values of b* of the puller body 23, 33 are shown in Table 2.

[0080] Examples 3-1 to 3-15 shown in Table 3 are embodiments in which a test piece (a test piece in the shape of a zipper chain) manufactured from a ferritic stainless steel material (SUS430) was subjected to blackening treatment by chemical conversion treatment in the same manner as in the above examples. The appearances of Examples 3-1 to 3-15 are all deep black, and there is little change in visual effects due to the angle of light reflection. As for these Examples 3-1 to 3-15, the measurement results of the values of lightness L*, the values of a*, the values of b*, and the comparison results with the values of lightness L*, the values of a*, the values of b* of the puller body 23, 33 are shown in Table 3.

[0081] [Table 1]

[0082]

[0083] [Table 2]

[0084]

[0085] [Table 3]

[0086]

[0087] Note that the puller main bodies 23, 33 are blackened by painting, and are painted using paint that utilizes black that has low reflectance and high absorptance of visible light. The value of the lightness L* of this black is L* = 27.36, and the values of a* and b* are a* = -0.738, b* = -0.424.

[0088] Although the lock pins 21, 31 and the puller main bodies 23, 33 of these Examples 1-1 to Example 2-15 are two components that are assembled after being processed from different raw materials and colored, the difference (ΔL*) in the lightness L* of the puller main bodies 23, 33 and the lock pins 21, 31 is controlled to be in a low range of ΔL* ≤ 8.54. The "color difference Δa* from the main body" and the "color difference Δb* from the main body" are also controlled to be in a low range within the allowable range, and in particular, the difference (Δa*) in the value of a* is controlled to be in a low range of 0.03 ≤ Δa* ≤ 2.67. Thus, the appearance does not easily give the impression that the visual effects of the black of the two components are greatly different. In addition, by making the absolute value of the lightness L* be 31.70 ≤ L* ≤ 35.90, and making the values of a* and b* be -0.708 ≤ a* ≤ 1.929, -2.428 ≤ b* ≤ 0.466, respectively, the black of the lock pins 21, 31 becomes a range of black that can be said to be a so-called pure black in which the reflectance of visible light is lower and the absorptance is higher, although it is also black, and thus, even if used as a component in the puller of the slide fastener in a product in which the overall product is designed to be pure black, it does not give the impression that only the portion of the lock pin 21, 31 is obviously different. Note that in some of the examples, there are also examples in which the difference (ΔL*) in the lightness L* of the puller main bodies 23, 33 and the lock pins 21, 31 exceeds 6.3, and the lightness is slightly brighter, but in those examples, by controlling the difference (Δa*) in the value of a* to be in a low range of less than 2.7, there is no sense of incongruity in which it looks like reddish brown due to the angle of reflection of light.

[0089] In particular, the difference (ΔL*) in the lightness L* of the lock pin 21, 31 and the puller body 23, 33 of the nickel-based austenitic stainless steel material of Examples 1-1 to 1-15 was controlled to be in a low range of 4.34 ≤ ΔL* ≤ 6.79. The "color difference Δa* from the body" and the "color difference Δb* from the body" were also controlled to be in a low range within the allowable range, and in particular, the difference (Δa*) in the value of a* was controlled to be in a low range of 1.11 ≤ Δa* ≤ 2.47. Thus, the appearance was not likely to give an impression that the visual effects of the black color of the two components were greatly different. In addition, by making the absolute value of the lightness L* 31.70 ≤ L* ≤ 34.16, and making the values of a* and b* 0.369 ≤ a* ≤ 1.736, -2.428 ≤ b* ≤ 0.466, respectively, the black color of the lock pin 21, 31 became a black color in a range that can be said to be a so-called pure black color in which the reflectance of visible light is lower and the absorption is higher, although it is the same black color, and thus, even when used as a component in the puller of the slide fastener in a product having a design concept in which the entire product is pure black, an impression that only the portion of the lock pin 21, 31 is significantly different was not given.

[0090] In particular, the difference (ΔL*) in the lightness L* of the lock pin 21, 31 and the puller body 23, 33 of the manganese-based austenitic stainless steel material of Examples 2-1 to 2-15 was controlled to be in a low range of 5.68 ≤ ΔL* ≤ 8.54. The "color difference Δa* from the body" and the "color difference Δb* from the body" were also controlled to be in a low range within the allowable range, and in particular, the difference (Δa*) in the value of a* was controlled to be in a low range of 0.03 ≤ Δa* ≤ 2.67. Thus, the appearance was not likely to give an impression that the visual effects of the black color of the two components were greatly different. In addition, by making the absolute value of the lightness L* 33.04 ≤ L* ≤ 35.90, and making the values of a* and b* -0.708 ≤ a* ≤ 1.929, -2.388 ≤ b* ≤ -1.495, respectively, the black color of the lock pin 21, 31 became a black color in a range that can be said to be a so-called pure black color in which the reflectance of visible light is lower and the absorption is higher, although it is the same black color, and thus, even when used as a component in the puller of the slide fastener in a product having a design concept in which the entire product is pure black, an impression that only the portion of the lock pin 21, 31 is significantly different was not given.

[0091] Moreover, in the test pieces (zipper tooth-shaped test pieces) made of ferritic stainless steel material (SUS430) of Embodiments 3-1 to 3-15 as well, like the above-mentioned locking pins 21, 31, the difference (ΔL*) in the lightness L* was controlled to be in a low range of 2.31 ≤ ΔL* ≤ 8.94. The "color difference Δa* from the main body" and the "color difference Δb* from the main body" were also controlled to be in a low range within the allowable range, and in particular, the difference (Δa*) in the value of a* was controlled to be in a low range of 0.11 ≤ Δa* ≤ 1.49. Thus, the appearance was not likely to give an impression that there was a large difference in the visual effect of the black color of the two components. In addition, since the absolute value of the lightness L* was 29.67 ≤ L* ≤ 36.24, and the value of a* and the value of b* were -0.63 ≤ a* ≤ 0.76, 0.42 ≤ b* ≤ 1.22, respectively, by using not only the puller 20, 30, the zipper tooth but also these Embodiments 3-1 to 3-15, in a product in which the overall product was designed to be pure black, an impression that the zipper tooth part was significantly different was not given, and an impression of black that gave a sense of unity as a whole of the zipper could be given.

[0092] In contrast, regarding a comparative example in which the locking pin was blackened by chemical conversion treatment, but the degree of blackening was insufficient (i.e., a comparative example in which only the reflectance of visible light was not low enough and the absorptivity was not high enough), the results after color measurement were as follows.

[0093] [Table 4]

[0094]

[0095] In the case of the locking pin of Comparative Example 1 in Table 4, the black color of the appearance was a slightly reddish black color compared to Embodiments 1-1 to 2-15, and looked reddish brown depending on the reflection angle of light. The difference (ΔL*) in the lightness L* of the locking pin of this Comparative Example 1 from the puller main body 23, 33 was a slightly high ΔL* = 6.35, and the color difference Δa* from the main body was also as high as 5.40. Thus, an impression was given that there was a large difference in the visual effect of the black color from the puller main body. Moreover, since the absolute value of the lightness L* was L* = 33.71, and the value of a* and the value of b* were a* = 4.67, b* = -0.16, respectively, the black color of the locking pin was in a range that could be said to be a so-called pure black color in which the reflectance of visible light was lower and the absorptivity was higher, although it was black, and if used as a component in the puller of the zipper in a product in which the overall product was designed to be pure black, an impression was given that only the part of the locking pin was significantly different.

[0096] In the case of the locking pin of Comparative Example 2 in Table 4, the appearance is a color closer to brown than black, and appears brown depending on the angle of light reflection. The difference (ΔL*) in lightness L* of the locking pin of Comparative Example 2 from the puller body 23, 33 is extremely high ΔL* = 16.1, and the color difference Δa* from the body is also as high as 19.6. Thus, an impression of a large difference in the visual effect of black from the puller body is imparted. Also, since the absolute value of lightness L* is L* = 43.48, and the values of a* and b* are a* = 18.89 and b* = 10.58, respectively, the color of the locking pin is not black but a color close to brown, and if used as a component in the puller of the slide fastener in a product having a design concept in which the entire product is pure black, an impression of a part where only the locking pin is obviously different is imparted.

[0097] In contrast, the puller 20, 30 of the present application, since it has the structure described above, even if the chemically converted black locking pin 21, 31 is used as a component in the puller of the slide fastener in a product having a design concept in which the entire product is pure black, an impression of a part where only the locking pin 21, 31 is obviously different in color is not imparted. Also, in the case where the same black oxide film is further provided on the slide fastener chain of stainless steel, an impression of black imparted as a unified sense of the entire slide fastener is imparted.

[0098] Next, with reference to Figure 6 to Figure 23 The film thickness condition of the oxide film formed on the surface of the locking pin 21, 31 or test piece (test piece in the shape of a slide fastener chain) in the embodiment of the present application is described.

[0099] Figure 6 to Figure 17 is a graph showing the results obtained by analyzing the distribution condition of the metal elements contained in the black oxide film 53 formed on the surface of the locking pin 21, 31 in the embodiment of the present application in the depth direction using Auger electron spectroscopy.

[0100] Figure 18 to Figure 23 is a graph showing the results obtained by analyzing the distribution condition of the metal elements contained in the black oxide film 53 formed on the surface of the test piece (test piece in the shape of a slide fastener chain) in the embodiment of the present application in the depth direction using Auger electron spectroscopy.

[0101] First, the Figure 6 to Figure 11 is described. Figure 6 to Figure 11 As with Examples 1-1 to 1-15 shown in Table 1 above, it is the results obtained by analyzing the locking pin 21, 31 in the embodiment of the present application manufactured from a nickel-based austenitic stainless steel material containing 10 to 14% of nickel.

[0102] For convenience, the Figure 6The implementation samples analyzed in this study are referred to as Examples 1-16. Figure 7 The implementation samples analyzed in this study are referred to as Examples 1-17. Figure 8 The implementation samples analyzed in this study are referred to as Examples 1-18. Figure 9 The implementation samples analyzed in this study are referred to as Examples 1-19. Figure 10 The implementation samples analyzed in this study are referred to as Examples 1-20. Figure 11 The implementation samples analyzed in this study are referred to as Examples 1-21.

[0103] Here, the relationship between the implementation samples of Examples 1-1 to 1-15 shown in Table 1 and the implementation samples of Examples 1-16 to 1-21 for which film thickness data was obtained using Auger electron spectroscopy is described in detail. Examples 1-1 to 1-5 in Table 1 and Examples 1-16 for which film thickness data was obtained using Auger electron spectroscopy are further detailed. Figure 6 ) and Examples 1-17 ( Figure 7 () refers to a set of implementation samples that underwent chemical conversion treatment within the same manufacturing batch. Specifically, when chemically converting small components such as locking pins, hundreds of locking pins were chemically converted together. Locking pins randomly sampled from these hundreds of chemically converted components from the same manufacturing batch to obtain measurement data are Examples 1-1, 1-2, 1-3, 1-4, 1-5, and Example 1-16 (where film thickness data was obtained using Auger electron spectroscopy) in Table 1. Figure 6 ) and Examples 1-17 ( Figure 7 These seven.

[0104] Similarly, Examples 1-6, 1-7, 1-8, 1-9, 1-10 in Table 1 and Examples 1-18, which obtained film thickness data using Auger electron spectroscopy, are also included. Figure 8 ) and Examples 1-19 Figure 9 These seven belong to a group that underwent chemical conversion treatment as part of the same manufacturing batch.

[0105] Similarly, Examples 1-11, 1-12, 1-13, 1-14, 1-15 in Table 1 and Examples 1-20, which obtained film thickness data using Auger electron spectroscopy, are also included. Figure 10 ) and Examples 1-21 ( Figure 11 These seven belong to a group that underwent chemical conversion treatment as part of the same manufacturing batch.

[0106] right Figure 6 Please provide an explanation. Figure 6is a graph showing the change in the proportion of each metal element in the thickness direction of the oxide film layer of the locking pin 21, and by observing the distribution change of oxygen (O) together with the component elements of iron (Fe), manganese (Mn), chromium (Cr), nickel (Ni), carbon (C), and silicon (Si) contained in the stainless steel material as the base material, the thickness of the oxide film can be inferred. In the present specification, the thickness in the depth direction up to the position at which the value becomes 50% of the value of the oxygen content near the surface formed on the test material (the maximum value) is defined as the thickness of the oxide film in the characteristic sense (hereinafter, simply referred to as "the thickness of the oxide film" or "the film thickness"). For example, in Figure 6 , the maximum value of the oxygen content near the surface formed on the test material is the vertical axis value (Intensity: Intensity) of about 3500, and the depth of 1750, which is the value of 50% thereof, is 340 nm, which is taken as the thickness of the oxide film.

[0107] That is, the thickness of the oxide film of Example 1-16 is 340 nm.

[0108] Likewise, if the film thickness of the oxide film is observed, then Figure 7 the thickness of the oxide film of Example 1-17 shown in FIG. 17 is 320 nm. Figure 8 the thickness of the oxide film of Example 1-18 shown in FIG. 18 is 530 nm. Figure 9 the thickness of the oxide film of Example 1-19 shown in FIG. 19 is 480 nm. Figure 10 the thickness of the oxide film of Example 1-20 shown in FIG. 20 is 1260 nm. Figure 11 the thickness of the oxide film of Example 1-21 shown in FIG. 21 is 1010 nm.

[0109] The distribution range of the thickness of the oxide film of the six test samples of Example 1-16 to Example 1-21 is 320 nm or more and 1260 nm or less.

[0110] Next, the results of the analysis of the locking pins 21, 31 manufactured from the manganese-based austenitic stainless steel material containing 13 to 17% of manganese in the embodiments of the present application will be described. Figure 12 to Figure 17

[0111] Figure 12 to Figure 17 Like Examples 2-1 to 2-15 shown in Table 2 above, it is the result obtained by analyzing the locking pins 21, 31 in the embodiments of the present application manufactured from the manganese-based austenitic stainless steel material containing 13 to 17% of manganese.

[0112] For convenience, the test sample analyzed in Figure 12 will be referred to as Example 2-16, the test sample analyzed in Figure 13 will be referred to as Example 2-17, the test sample analyzed in Figure 14 will be referred to as Example 2-18, and the test sample analyzed in Figure 15 ​The implementation sample analyzed in this study is referred to as Example 2-19. Figure 16 The implementation samples analyzed in this study are referred to as Examples 2-20. Figure 16 The implementation sample analyzed in this study is referred to as Example 2-21.

[0113] Here, the relationship between the implementation samples of Examples 2-1 to 2-15 shown in Table 2 and the implementation samples of Examples 2-16 to 2-21 for which film thickness data was obtained using Auger electron spectroscopy is described in detail. Examples 2-1 to 2-5 and Example 2-16 for which film thickness data was obtained using Auger electron spectroscopy are shown in Table 2. Figure 12 ) and Examples 2-17 Figure 13 () refers to a set of implementation samples that underwent chemical conversion treatment as part of the same manufacturing batch. Specifically, when chemically converting small components such as locking pins, hundreds of locking pins were chemically converted together. Locking pins randomly sampled from these hundreds of chemically converted components of the same manufacturing batch to obtain measurement data are Examples 2-1, 2-2, 2-3, 2-4, 2-5, and Example 2-16 (where film thickness data was obtained using Auger electron spectroscopy) in Table 2. Figure 12 ) and Examples 2-17 Figure 13 These seven.

[0114] Similarly, Examples 2-6, 2-7, 2-8, 2-9, 2-10 in Table 2 and Example 2-18, which obtained film thickness data using Auger electron spectroscopy, are also included. Figure 14 ) and Examples 2-19 Figure 15 These seven belong to a group that underwent chemical conversion treatment as part of the same manufacturing batch.

[0115] Similarly, Examples 2-11, 2-12, 2-13, 2-14, 2-15 in Table 2 and Example 2-20, which obtained film thickness data using Auger electron spectroscopy, are also included. Figure 16 ) and Examples 2-21 Figure 17 These seven belong to a group that underwent chemical conversion treatment as part of the same manufacturing batch.

[0116] These from Figure 12 to Figure 17 The definition of oxide film thickness read from the measurement data is the same as that described above. Figure 6 The explanatory methods are the same. That is, in Figure 12 In the process, the maximum oxygen content near the surface of the material being inspected is approximately 3750 on the vertical axis (Intensity), which will become 50% of its value, i.e., 1875, at a depth of 440 nm as the thickness of the oxide film.

[0117] That is, the thickness of the oxide film of Example 2-16 was 440 nm.

[0118] Likewise, if the film thickness of the oxide film is observed, then Figure 13 the thickness of the oxide film of Example 2-17 shown was 570 nm. Figure 14 the thickness of the oxide film of Example 2-18 shown was 840 nm. Figure 15 the thickness of the oxide film of Example 2-19 shown was 860 nm. Figure 16 the thickness of the oxide film of Example 2-20 shown was 1870 nm. Figure 17 the thickness of the oxide film of Example 2-21 shown was 1830 nm.

[0119] The distribution range of the thickness of the oxide film of the six samples of Example 2-16 to Example 2-21 was from 440 nm or more to 1870 nm or less.

[0120] On the other hand, regarding the comparative example that failed to form the oxide film thickness to a thickness that sufficiently suppresses the reflection of visible light to near complete black, the Figure 18 to Figure 21 The following description is made similarly to the above-described examples.

[0121] Figure 18 and Figure 19 is a result obtained by analyzing a sample taken from a lock pin that was subjected to chemical conversion treatment in the same manufacturing lot as Comparative Example 1, using Auger electron spectroscopy, similarly to the above-described examples. For convenience, the sample analyzed in this Figure 18 is referred to as Comparative Example 1-2, and the sample analyzed in this Figure 19 is referred to as Comparative Example 1-3. Regarding Comparative Example 1-2 and Comparative Example 1-3, if a presumed value of the film thickness is found by analyzing using Auger electron spectroscopy similarly to the above, it is known that the oxide film thickness of Comparative Example 1-2 was about 2020 nm, and the oxide film thickness of Comparative Example 1-3 was about 2300 nm. That is, it is known that the film thickness of Comparative Example 1 became too thick compared to the distribution range of the film thickness of the examples of the present application.

[0122] Figure 20 and Figure 21 is a result obtained by analyzing a sample taken from a lock pin that was subjected to chemical conversion treatment in the same manufacturing lot as Comparative Example 2, using Auger electron spectroscopy, similarly to the above-described examples. For convenience, the sample analyzed in this Figure 20 is referred to as Comparative Example 2-2, and the sample analyzed in this Figure 21The samples analyzed are referred to as Comparative Examples 2-2 and 2-3. Regarding Comparative Examples 2-2 and 2-3, if the estimated film thickness is determined by Auger electron spectroscopy in the same manner as described above, it can be seen that the oxide film thickness of Comparative Example 2-2 is approximately 40 nm, and the oxide film thickness of Comparative Example 2-3 is approximately 60 nm. In other words, it can be seen that the film thickness of Comparative Example 2 is too thin compared to the film thickness distribution range of the embodiments of the present invention.

[0123] Furthermore, Auger electron spectroscopy was also used to analyze another sample, which was a locking pin made of stainless steel containing 10% to 14% nickel by weight, similar to Comparative Example 2, but which underwent chemical conversion treatment as a different manufacturing batch than Comparative Example 2. This sample was designated as Comparative Example 3.

[0124] The black of Comparative Example 3 is a slightly reddish black, and appears brown depending on the angle of light reflection. It cannot be evaluated as a black within the range of so-called pure black, which has low reflectivity and high absorption of visible light.

[0125] Regarding Comparative Example 3, the results obtained by analyzing it using Auger electron spectroscopy in the same manner as above are as follows: Figure 22 As shown. Based on Figure 22 If the estimated film thickness is obtained in the same manner as above, the oxide film thickness is approximately 2020 nm. In other words, it can be seen that the film thickness of Comparative Example 3 is excessively thick compared to the film thickness distribution range of the embodiments of the present invention.

[0126] Based on the analysis results of the various embodiments and comparative examples described above, it can be seen that if the thickness of the oxide film is greater than 2000 nm as in Comparative Example 1, it will exhibit a light reflection tendency such as a small brightness L* but a high value of a*. Therefore, compared with the embodiment, it appears as a slightly reddish black, and depending on the angle of light reflection, it appears as reddish brown.

[0127] On the other hand, it can be seen that if the thickness of the oxide film is less than 100 nm as in Comparative Example 2, the lightness L* becomes too high (becomes too bright) and the values ​​of a* and b* also become high, so colored light will be reflected. Compared with the embodiment, the appearance becomes a color that is closer to brown than black, and it looks brown depending on the angle of light reflection.

[0128] Furthermore, as can be seen from Comparative Example 3, if the thickness of the oxide film is greater than 2000 nm, the black color will turn into a slightly reddish black.

[0129] From the results of the above comparative examples, it is known that the thickness of the oxide film needs to be a film thickness of a size greater than 100 nm, and it is also known that it needs to be a film thickness less than 2000 nm. Furthermore, from the results of the above examples, it is known that the thickness of the oxide film is preferably a film thickness of 320 nm or more and 1870 nm or less.

[0130] Furthermore, it is also understood that, in the distribution of the appropriate film thickness value range in the locking pin composed of the nickel-based stainless steel material shown in Examples 1-16 to 1-21, and the distribution of the appropriate film thickness value range in the locking pin composed of the manganese-based stainless steel material shown in Examples 2-16 to 2-21, the appropriate value range is distributed to a slightly smaller film thickness in the case of the nickel-based material compared to the manganese-based material. That is, it can be said that, in the case where the stainless steel material of the locking pin 21, 31 is a stainless steel material containing 10% or more and 14% or less of nickel in terms of weight percentage, the thickness of the oxide film on the surface of the locking pin 21, 31 is preferably 320 nm or more and 1260 nm or less; on the other hand, in the case where the stainless steel material of the locking pin 21, 31 is a stainless steel material containing 13% or more and 17% or less of manganese in terms of weight percentage, the thickness of the oxide film on the surface of the locking pin 21, 31 is preferably 440 nm or more and 1870 nm or less.

[0131] In general, the formation of the black oxide film of the stainless steel material by chemical conversion treatment has the following relationship: the longer the time of immersion in the chemical conversion treatment solution (solution of the chromic acid type or solution of the caustic soda type, etc.) in which the oxide film is formed, the greater the film thickness, and therefore, as described above, if the appropriate film thickness value range is known, it is also easy to infer the appropriate range of the time of immersion in the chemical conversion treatment solution, and the above technical knowledge is advantageous technical information in terms of efficiency in the manufacturing process.

[0132] Next, although it is a test piece (test piece in the shape of a zipper tooth) other than the locking pin (and the material is a ferritic stainless steel material (SUS430)), it was also subjected to analysis of the film thickness, and therefore, using the same method as in the above examples, the thickness of the oxide film on the surface of the test piece was measured. Figure 23 to Figure 28 The results thereof will be described.

[0133] It should be noted that ferritic stainless steel, being an alloy of iron and chromium and containing no nickel, has the disadvantage of being prone to oxidation (rusting). On the other hand, compared to austenitic stainless steel, ferritic stainless steel is less prone to work hardening and has the advantage of being easier to process. Therefore, ferritic stainless steel is advantageous for use in components with high processing rates, such as zipper teeth, which are forged. Although this differs from the case of locking pins, where the use of austenitic stainless steel is advantageous, it is important to comprehensively analyze and study the tendency of zipper teeth to become black due to surface treatment, along with the tendency of locking pins and zipper pulls, in order to achieve a unified black finish for the zipper as a whole.

[0134] Figure 23 to Figure 28 Similar to Examples 3-1 to 3-15 shown in Table 3 above, the results were obtained by analyzing test pieces (zipper tooth-shaped test pieces) made of ferritic stainless steel (SUS430).

[0135] For convenience, Figure 23 The implementation samples analyzed in this study are referred to as Examples 3-16. Figure 24 The implementation samples analyzed in this study are referred to as Examples 3-17. Figure 25 The implementation samples analyzed in this study are referred to as Examples 3-18. Figure 26 The implementation sample analyzed in this study is referred to as Example 3-19. Figure 27 The implementation samples analyzed in this study are referred to as Examples 3-20. Figure 28 The implementation sample analyzed in this study is referred to as Example 3-21.

[0136] Here, the relationship between the implementation samples of Examples 3-1 to 3-15 shown in Table 3 and the implementation samples of Examples 3-16 to 3-21 for which film thickness data was obtained using Auger electron spectroscopy is described in detail. Examples 3-1 to 3-5 and Example 3-16 for which film thickness data was obtained using Auger electron spectroscopy are shown in Table 3. Figure 23 ) and Examples 3-17 Figure 24 () refers to a set of implementation samples that underwent chemical conversion treatment within the same manufacturing batch. Specifically, when chemically converting small components such as locking pins, hundreds of locking pins were chemically converted together. Locking pins randomly sampled from these hundreds of chemically converted components from the same manufacturing batch to obtain measurement data are Examples 3-1, 3-2, 3-3, 3-4, 3-5, and Example 3-16 (for which film thickness data was obtained using Auger electron spectroscopy) in Table 3. Figure 23 ) and Examples 3-17 Figure 24 These seven.

[0137] Similarly, Examples 3-6, 3-7, 3-8, 3-9, 3-10 in Table 3 and Example 3-18, which obtained film thickness data using Auger electron spectroscopy, are also included. Figure 25 ) and Examples 3-19 Figure 26 These seven belong to a group that underwent chemical conversion treatment as part of the same manufacturing batch.

[0138] Similarly, Examples 3-11, 3-12, 3-13, 3-14, 3-15 in Table 3 and Example 3-20, which obtained film thickness data using Auger electron spectroscopy, are also included. Figure 27 ) and Examples 3-21 Figure 28 These seven belong to a group that underwent chemical conversion treatment as part of the same manufacturing batch.

[0139] These from Figure 23 to Figure 28 The definition of oxide film thickness read from the measurement data is the same as that described above. Figure 6 The explanatory methods are the same. That is, in Figure 23 In the process, the maximum oxygen content near the surface of the material being inspected is approximately 4300 on the vertical axis (intensity), which will become 50% of its value, i.e., 2150, and the depth, i.e., 1010 nm, as the thickness of the oxide film.

[0140] That is, the thickness of the oxide film in Examples 3-16 is 1010 nm.

[0141] Similarly, if we observe the thickness of the oxide film, then Figure 24 The oxide film thickness of Examples 3-17 shown is 1070 nm. Figure 25 The oxide film thickness of Examples 3-18 shown is 1620 nm. Figure 26 The oxide film thickness of Examples 3-19 shown is 1470 nm. Figure 27 The oxide film thickness of Examples 3-20 shown is 2190 nm. It should be noted that... Figure 28 The oxide film thickness of Examples 3-21 shown is 2500 nm or more. Since this exceeds the range that the device can measure, the film thickness cannot be estimated using the same estimation method as described above. However, it can be estimated to be approximately 2600 nm or more and 2800 nm or less. Therefore, the intermediate value of 2700 nm is taken as the estimated film thickness.

[0142] The thickness of the oxide film in the six examples 3-16 to 3-21 ranges from 1010 nm to 2700 nm.

[0143] Here, the shape of the fastener element is roughly a hexahedron having opposite parallel planes, and in the surface treatment with a chemical solution, the planes are easily overlapped with each other. Since the overlapped planes are difficult to flow with the coloring treatment solution, the film thickness of the overlapped planes grows slowly. On the other hand, since the shape of the locking pin is not that of a hexahedron, the coloring treatment solution flows well over the entire surface of the locking pin. Therefore, in order to uniformly color (chemically convert) the fastener element, the treatment time needs to be extended compared to that of the locking pin, and as a result, the oxide film formed on the surface has a tendency to thicken. On the other hand, since the film thickness of the surface of the locking pin grows roughly uniformly as a whole, it is possible to uniformly color in a short time. In addition, since the ferritic stainless steel material does not contain nickel, it is more easily oxidized than the austenitic stainless steel material, and has a tendency that the growth rate of the film thickness by the surface treatment becomes fast. In view of this, the oxide film thickness of the fastener element made of the ferritic stainless steel material has a tendency to thicken compared to the oxide film thickness of the locking pin made of the austenitic stainless steel material.

[0144] Although the surface treatment of the fastener element is different from that of the locking pin at this point, it is important to comprehensively analyze and study the tendency of the fastener element to be blackened by the surface treatment in combination with the tendency of the locking pin and the puller to be blackened in terms of realizing black color that has a sense of unity as a whole of the fastener.

[0145] From the results described above Figure 23 to Figure 28 From the results of the color measurement data shown in Table 3, it is known that, for the test piece of the ferritic stainless steel material (SUS430) (the test piece in the shape of the fastener element), if the thickness of the oxide film is set to be 1010 nm or more and 2700 nm or less, it becomes black color in a range that can be said to be so-called pure black color in which the reflectance of visible light is lower and the absorptance is higher although it is black color. From this, it is known that, by using a material that becomes the film thickness in the above appropriate numerical range on the basis of being the ferritic stainless steel material (SUS430) not only for the puller 20, 30 but also for the fastener element, in a product design concept in which the entire product is pure black color, it is possible to bring an impression of black color that has a sense of unity as a whole of the fastener without bringing an impression that the fastener element part of the fastener is significantly different.

[0146] Note that the present application is not limited only to the above-described embodiments, and can appropriately use a technique recognized by those skilled in the art as a technique substantially the same as each technical matter described in the embodiments of the present application or a technique that has the same effect, or use it as an alternative technique, or add and supplement it. In addition, the feature structures of each of the above-described embodiments can be reorganized and implemented with each other.

[0147] In addition, throughout the present specification, the portions described with reference to the numbers annotated in the drawings are described as the minimum required components in each embodiment of the present application, and this does not mean that the present application is constituted only by the portions described with reference to the numbers annotated in the drawings.

[0148] In addition, the numerical values described in the articles of the present specification are numerical values that have been converted, analyzed, and compared on the basis of the numerical values in the tables described in the present specification, and when there is any inconsistency in the correspondence of the numerical values, in principle, the numerical values filled in the tables are presumed to be reliable.

Claims

1. A zipper pull, characterized in that, The zipper pull (20, 30) comprises a zipper head body (23, 33), a pull tab (25, 35), and a locking pin (21, 31). The locking pins (21, 31) are made of stainless steel. A black oxide film is formed on the surface of the locking pins (21, 31). The lightness L* on the surface of the locking pins (21, 31) in the CIELAB color space specified in JIS Z8781-4 (2013) is 31.70≤L*≤35.90, and the value of a* is -0.708≤a*≤1.

929.

2. The zipper pull according to claim 1, characterized in that, The value of b* on the surface of the locking pins (21, 31) in the CIELAB color space specified in JIS Z8781-4 (2013) is -2.428≤b*≤0.

466.

3. The zipper pull according to claim 1, characterized in that, The locking pins (21, 31) are made of austenitic stainless steel containing 10-14% nickel by weight. The lightness L* on the surface of the locking pins (21, 31) in the CIELAB color space specified in JIS Z8781-4 (2013) is 31.70≤L*≤34.16, the value of a* is 0.369≤a*≤1.736, and the value of b* is -2.428≤b*≤0.

466.

4. The zipper pull according to claim 1, characterized in that, The locking pins (21, 31) are made of austenitic stainless steel containing 13-17% manganese by weight. The lightness L* on the surface of the locking pins (21, 31) in the CIELAB color space specified in JIS Z8781-4 (2013) is 33.04≤L*≤35.90, the value of a* is -0.708≤a*≤1.929, and the value of b* is -2.388≤b*≤-1.

495.

5. The zipper pull according to claim 1 or 2, characterized in that, The main body of the zipper pull (23, 33) is black. In the CIELAB color space specified by JIS Z8781-4 (2013), the difference ΔL* between the lightness L* of the zipper pull body (23, 33) and the lightness L* of the locking pin (21, 31) is ΔL*≤8.

54. The difference Δa* between the a* value of the zipper pull body (23, 33) and the a* value of the locking pin (21, 31) as specified in the CIELAB color space defined by JIS Z8781-4 (2013) is 0.03≤Δa*≤2.

67.

6. The zipper pull according to claim 3, characterized in that, The main body of the zipper pull (23, 33) is black. In the CIELAB color space specified by JIS Z8781-4 (2013), the difference ΔL* between the lightness L* of the slider body (23, 33) and the lightness L* of the locking pin (21, 31) is ΔL*≤6.

79. The difference Δa* between the a* value of the zipper pull body (23, 33) and the a* value of the locking pin (21, 31) as specified in the CIELAB color space defined by JIS Z8781-4 (2013) is 1.11≤Δa*≤2.

47.

7. The zipper pull according to claim 4, characterized in that, The main body of the zipper pull (23, 33) is black. In the CIELAB color space specified by JIS Z8781-4 (2013), the difference ΔL* between the lightness L* of the zipper pull body (23, 33) and the lightness L* of the locking pin (21, 31) is ΔL*≤8.

54. The difference Δa* between the a* value of the zipper pull body (23, 33) and the a* value of the locking pin (21, 31) as specified in the CIELAB color space defined by JIS Z8781-4 (2013) is 0.03≤Δa*≤2.

67.

8. The zipper pull according to claim 1 or 2, characterized in that, The thickness of the oxide film on the surface of the locking pins (21, 31) is above 320nm and below 1870nm.

9. The zipper pull according to any one of claims 1, 3, and 6, characterized in that, The stainless steel material of the locking pins (21, 31) is an austenitic stainless steel material containing more than 10% and less than 14% nickel by weight, and the thickness of the oxide film on the surface of the locking pins (21, 31) is more than 320nm and less than 1260nm.

10. The zipper pull according to any one of claims 1, 4, and 7, characterized in that, The stainless steel material of the locking pins (21, 31) is an austenitic stainless steel material containing more than 13% and less than 17% manganese by weight, and the thickness of the oxide film on the surface of the locking pins (21, 31) is more than 440nm and less than 1870nm.

11. A zipper, characterized in that, A zipper pull comprising any one of claims 1 to 4, wherein the zipper teeth are made of ferritic stainless steel, and the lightness L* of the zipper teeth as specified in the CIELAB color space as defined in JIS Z8781-4 (2013) is 29.67≤L*≤36.24, the value of a* is -0.63≤a*≤0.76, and the value of b* is 0.42≤b*≤1.

22.

12. The zipper according to claim 11, characterized in that, The zipper pull body (23, 33) is black. The difference ΔL* between the lightness L* of the chain teeth in the CIELAB color space specified by JIS Z8781-4 (2013) and the lightness L* of the zipper pull body (23, 33) is ΔL*≤8.94, and the difference Δa* between the values ​​of a* is 0.11≤Δa*≤1.

49.

13. The zipper according to claim 11, characterized in that, The thickness of the oxide film on the zipper teeth is between 1010 nm and 2700 nm.

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