Abstract
A method for subjecting garment accessories to a surface electrolytic treatment provides various metallic colors to metallic garment accessories in a cost effective manner. The method can provide a first metallic color on one side of outer surface of the garment accessory and provide a second metallic color on the other side of the outer surface, by placing one or more metallic garment accessories in an electrolytic solution in a non-contact state with an anode and a cathode for passing electric current through the electrolytic solution, passing electric current through the electrolytic solution and generating a bipolar phenomenon on the garment accessory.
Claims
1. A method for subjecting garment accessories to a surface electrolytic treatment, comprising placing one or more metallic garment accessories in an electrolytic solution in a non-contact state with an anode and a cathode for passing electric current through the electrolytic solution, passing electric current through the electrolytic solution and generating a bipolar phenomenon on the one or more metallic garment accessories to provide at least a part of an outer surface of the one or more metallic garment accessories with at least one metallic color different from a color of the outer surface prior to the surface electrolytic treatment, wherein the method comprises controlling a posture of the one or more metallic garment accessories such that one side of the outer surface of the one or more metallic garment accessories faces the anode and the other side of the outer surface faces the cathode while passing electric current through the electrolytic solution, wherein the one or more metallic garment accessories are elements for a slide fastener, and wherein the method comprises intermittently or continuously passing the elements which are attached to fastener tapes through the electrolytic solution so as to subject the elements to the surface electrolytic treatment.
2. The method according to claim 1, wherein the at least one metallic color comprises a first metallic color and a second metallic color, the first metallic color being provided on the one side of the outer surface of the one or more metallic garment accessories while at the same time providing the second metallic color on the other side of the outer surface.
3. The method according to claim 2, wherein the at least one metallic color comprises a third metallic color, the third metallic color being provided between the first metallic color and the second metallic color on the outer surface of the one or more metallic garment accessories.
4. A method for producing a garment accessory having a metallic color on at least a part of its outer surface, the metallic color being different from a color of an untreated outer surface of the garment accessory, the method comprising the steps of placing one or more garment accessories in an electrolytic solution in a non-contact state with an anode and a cathode for passing electric current through the electrolytic solution, and passing electric current through the electrolytic solution to generate a bipolar phenomenon on the one or more garment accessories, wherein the method comprises controlling a posture of the one or more garment accessories such that one side of the outer surface of the one or more garment accessories faces the anode and the other side of the outer surface faces the cathode while passing electric current through the electrolytic solution, wherein the one or more garment accessories are elements for a slide fastener, and wherein the method comprises intermittently or continuously passing the elements which are attached to fastener tapes through the electrolytic solution so as to subject the elements to a surface electrolytic treatment.
5. The method according to claim 4, wherein the metallic color comprises a first metallic color and a second metallic color, the first metallic color being provided on one side of the outer surface of the one or more garment accessories while at the same time providing the second metallic color on the other side of the outer surface.
6. The method according to claim 5, wherein the metallic color comprises a third metallic color, the third metallic color being provided between the first metallic color and the second metallic color on the outer surface of the one or more garment accessories.
7. A method for subjecting a garment accessory to a surface electrolytic treatment, comprising placing one or more metallic garment accessories in an electrolytic solution in a non-contact state with an anode and a cathode for passing electric current through the electrolytic solution, passing electric current through the electrolytic solution and generating a bipolar phenomenon on the one or more metallic garment accessories to provide at least a part of an outer surface of the one or more metallic garment accessories with at least one metallic color different from a color of an untreated outer surface, wherein the method comprises controlling a posture of the one or more metallic garment accessories such that one side of the outer surface of the one or more metallic garment accessories faces the anode and the other side of the outer surface faces the cathode while passing electric current through the electrolytic solution, wherein the one or more metallic garment accessories are shell caps for buttons or for button mounting members, and wherein the method comprises rotationally flowing the shell caps with polishing materials in a container in which the electrolytic solution is contained so as to subject the shell caps to the surface electrolytic treatment.
8. The method according to claim 7, wherein the at least one metallic color comprises a first metallic color and a second metallic color, the first metallic color being provided on the one side of the outer surface of the one or more metallic garment accessories while at the same time providing the second metallic color on the other side of the outer surface.
9. The method according to claim 8, wherein the at least one metallic color comprises a third metallic color, the third metallic color being provided between the first metallic color and the second metallic color on the outer surface of the one or more garment accessories.
10. A method for producing a garment accessory having at least one metallic color on at least a part of its outer surface, the at least one metallic color being different from a color of an untreated outer surface of the garment accessory, the method comprising the steps of placing one or more garment accessories in an electrolytic solution in a non-contact state with an anode and a cathode for passing electric current through the electrolytic solution, and passing electric current through the electrolytic solution to generate a bipolar phenomenon on the one or more garment accessories, wherein the method comprises controlling a posture of the one or more garment accessory such that one side of the outer surface of the one or more garment accessory faces the anode and the other side of the outer surface faces the cathode while passing electric current through the electrolytic solution, wherein the one or more garment accessories are shell caps for buttons or for button mounting members, and wherein the method comprises rotationally flowing the shell caps with polishing materials in a container in which the electrolytic solution is contained so as to subject the shell caps to a surface electrolytic treatment.
11. The method according to claim 10, wherein the at least one metallic color comprises a first metallic color and a second metallic color, the first metallic color being provided on one side of the outer surface of the one or more garment accessories while at the same time providing the second metallic color on the other side of the outer surface.
12. The method according to claim 11, wherein the metallic color comprises a third metallic color, the third metallic color being provided between the first metallic color and the second metallic color on the outer surface of the one or more garment accessories.
Description
BRIEF DESCRIPTION OF DRAWINGS
(1) FIG. 1 is an explanatory side sectional view schematically showing a surface electrolytic treatment apparatus for subjecting elements for slide fasteners, an example of garment accessories, to a surface electrolytic treatment according to the present invention.
(2) FIG. 2 is an explanatory plan view of FIG. 1.
(3) FIG. 3 is an explanatory cross-sectional view taken along line A in FIG. 1.
(4) FIG. 4 is an explanatory cross-sectional view taken along line B in FIG. 1.
(5) FIG. 5 is an explanatory cross-sectional view taken along line C of FIG. 1.
(6) FIG. 6 is a partially enlarged view of FIG. 3.
(7) FIG. 7 is a partial plan view of a pair of right and left fastener tapes to which a number of elements have already been attached, respectively.
(8) FIG. 8 is an enlarged side view schematically showing one element after a surface electrolytic treatment as viewed from the arrow D in FIG. 7, the tape being represented in cross section.
(9) FIG. 9 is a perspective view of a shell cap.
(10) FIG. 10 is an explanatory view of a surface electrolytic treatment apparatus for performing a surface electrolytic treatment while polishing a large number of shell caps.
(11) FIG. 11 is a schematic cross-sectional view showing a button mounting member to which a shell cap is assembled.
(12) FIG. 12 is a perspective view showing a male snap button which is another example of metallic garment accessories.
(13) FIG. 13 is a perspective view showing a female snap button which is still another example of metallic garment accessories.
MODES FOR CARRYING OUT THE INVENTION
(14) Although some embodiments of the present invention will be described below with reference to the figures, the present invention is not limited to those embodiments, and appropriate modifications and the like may be made within the scope of the claims and their equivalents.
(15) Elements for Slide Fasteners
(16) FIG. 1 is an explanatory side sectional view schematically showing a surface electrolytic treatment apparatus 10 for subjecting elements (teeth) 1 for slide fasteners, an example of garment accessories, to the surface electrolytic treatment according to the present invention. FIG. 2 is an explanatory plan view of FIG. 1. FIGS. 3 to 5 are explanatory sectional views taken along the line A, the line B and the line C in FIG. 1, respectively. FIG. 6 is a partially enlarged view of FIG. 3. FIG. 7 is a plan view showing a part of a pair of right and left fastener tapes 2, 2 to which a large number of elements 1 have already been attached, where a large number of elements 1 are continuously attached to the edges on the opposite sides in the width direction of the respective fastener tapes 2, 2 along the longitudinal direction. The surface electrolytic treatment apparatus 10 can subject the elements 1 to the surface electrolytic treatment while passing the elongated fastener tapes 2 with the elements 1 attached thereto and before being cut at predetermined lengths in the longitudinal direction.
(17) The surface electrolytic treatment apparatus 10 comprises an electrolytic solution bath 11 which is opened upward and in which an electrolytic solution e is reserved; a cylindrical bipolar plating unit 20 which is disposed in the solution bath 11 and in which the pair of right and left fastener tapes 2 is intermittently or continuously passed from the left side to the right side of FIG. 1 in the state where the respective elements have been engaged or have been disengaged with each other; and a solution stirring pump 12 and a circulation path 13 for circulating the electrolytic solution e in the unit 20. The unit 20 is arranged in the solution bath 11 so that the axial direction is horizontal. The bipolar plating unit 20 includes a pair of left and right tape supporting portions 21 as viewed in FIG. 6, for passing through the fastener tapes 2 while supporting the same; an electrolytic solution flow channel 22 filled with the electrolytic solution e; and an anode 23 and a cathode 24 which are a pair of electrodes for energizing the electrolytic solution flow channel 22. The anode 23 and the cathode 24 are connected to an external power source (not shown). Each tape supporting portion 21 supports the tape 2 such that the element 1 of each tape 2 is exposed at its central portion in the up and down direction in the electrolytic solution flow channel 22. The edge portion on the side opposite to the element 1 in the width direction of each tape 2 is exposed to the outside of the unit 20 (see FIG. 6). The anode 23 is arranged at the top of the electrolytic solution flow channel 22 above the element 1 in the electrolytic solution flow channel 22 so as to extend along the axial direction (longitudinal direction) of the unit 20. The cathode 24 extends in the axial direction of the unit 20 at the bottom of the electrolytic solution flow channel 22 below the element 1 in the electrolytic solution flow channel 22 in the same manner as the anode 23. The left and right side walls (as viewed in FIG. 1) of the electrolytic solution bath 11 are also provided with openings 14 for passing through the fastener tapes 2. For example, the fastener tapes 2 are fed out from a roller (not shown) on the upstream side (left side in FIG. 1) and wound around a roller (not shown) on the downstream side (right side in FIG. 1), so that the fastener tapes 2 are passed inside the unit 20.
(18) One end of the circulation path 13 is connected to the pump 12 and the other end of the circulation path 13 is connected to a right end (as viewed in FIG. 1) of the electrolytic solution flow channel 22 in the unit 20 via horizontal connecting pipes 15 (see FIG. 5). To the left end (as viewed in FIG. 1) of the electrolytic solution flow channel 22 in the unit 20, two discharge pipes 25 which are vertically provided and are downwardly bent (FIG. 4) are connected. In such a way, the electrolytic solution in the electrolytic solution bath 11 is supplied from the one end portion (the right end portion in FIG. 1) of the unit 20 through the circulation path 13 and the horizontal connecting pipes 15 to the inside of the electrolytic solution flow channel 22 by means of the pump 12, and is discharged from the other end portion (the left end portion in FIG. 1) of the electrolytic solution flow channel 22 through the discharge pipes 25 to the solution bath 11 outside the unit 22. The electrolytic solution e is thus circulated so as to flow inside the unit 20 in the direction opposite to the direction in which the fastener tapes 2 are passed through.
(19) Next, the step of subjecting the fastener elements 1 to the surface electrolytic treatment using the surface electrolytic treatment apparatus 10 as described above will be described. First, the tapes 2 are moved so that a group of the elements 1 to be treated is arranged between the anode 23 and the cathode 24 in the electrolytic solution flow channel 22 in the unit 20, and the movement of the tapes 2 is then stopped. In this embodiment, the elements 1 between the pair of tapes 2 are disengaged to perform the surface treatment, but the engaged elements 1 may be targeted. Further, in this embodiment, the movement of the tape 2 is stopped during the surface treatment by way of example, but the surface treatment can be performed while continuously moving the tapes 2. For the surface treatment in the apparatus 10, in both the mode where the surface treatment is performed by stopping the tapes 2 and the mode where the surface treatment is performed while moving the tapes 2, the orientation and distance of the element 1 relative to the electrodes 23, 24 are constant. Electric current is then passed through the electrolytic solution flow channel 22 by applying a voltage between the anode 23 and the cathode 24 while circulating the electrolytic solution e by driving the pump 12. The circulation of the electrolytic solution e facilitates the supply of the metal ions to be deposited. After a certain period of time, the energization and the actuation of the pump 12 are stopped. During the energization, the bipolar phenomenon is produced on the elements 1 in the electrolytic solution e, and on one hand, the cathode 24-facing side of the bottom outer surface of the element 1 is positively charged to result in the metal dissolution, and on the other hand, the anode 23-facing side of the top outer surface of the element 1 is negatively charged so that the metal ions dissolved in the positive side are reduced and deposited. In addition, circulating the electrolytic solution e can increase the rate at which the metal ions of the elements 1, which have been dissolved in the positive pole, are deposited in the negative pole. FIG. 8 is an enlarged side view schematically showing one of the elements 1 after the surface electrolytic treatment as viewed from the arrow D in FIG. 7, the tapes 2 being represented in cross-section. As shown in this figure, the top (front surface) side of the outer surface of the element 1, which faced the anode 23, produces a first metallic color 1a by the bipolar plating, and the bottom (back surface) side which faced the cathode 24 produces a second metallic color 1b by the metal dissolution. Furthermore, depending on electrolytic treatment conditions, a third metallic color 1c that gradually changes from the first metallic color 1a to the second metallic color 1b may be produced between the first metallic color 1a and the second metallic colors 1b on the outer surface of the element 1. In FIG. 8, the boundary between the third metallic color 1c and the first and second metallic colors 1a, 1b is depicted by a straight line for the convenience. Further, the reference number 3 in FIG. 8 is a concave portion 3 on one side of an engaging head of the element 1, into which a convex portion of an engaging head of another element 1 is inserted, the concave portion 3 being adjacent the concave portion 3 in the engaged state of the elements 1. In addition, since a very small amount of the metal of the element 1 is dissolved in the positive pole and a very small amount of the metal is deposited in the negative pole, any function of the element 1 is not impaired. These first to third metallic colors 1a, 1b and 1c are different from the color of the base material or the substrate of the element 1. Thus, metallic colors different between the front and back surfaces can be concurrently imparted to the fastener element 1, so that the fastener elements 1 for the reversible design can be easily and cost-effectively produced.
(20) Shell Cap
(21) Next, examples in which a shell cap, a component of buttons or button mounting members, as an example of the garment accessories, is subjected to the surface electrolysis treatment will be described. FIG. 9 is a perspective view of a shell cap 30. The shell cap 30 comprises a disc portion 31 having a front surface 31a and a back surface 31b; and an annular side portion 32 projecting from the outer periphery of the disc portion 31 to the back surface side in the axial direction. FIG. 10 shows a surface electrolytic treatment apparatus 40 for applying the surface electrolytic treatment while polishing a large number of shell caps 30. The apparatus 40 is produced by arranging electrodes to a commercially available magnetic polishing rotary barrel apparatus, as described below. The apparatus 40 comprises a cylindrical container 41 that is open upward; and a rotating mechanism 50 provided below the container 41. The container 41 has a circular bottom plate 42 and a peripheral side plate 43, and the central portion of the bottom plate 42 is raised upward. At a corner between the bottom plate 42 and the peripheral side plate 43 in the container 41, an annular anode 44 is arranged so as to extend along the circumferential direction. Further, an annular cathode 45 is extended along the circumferential direction at the position upwardly away from the bottom plate 42 and radially inwardly away from the circumferential side plate 43 in the container 41. The position of the cathode 45 is set such that the cathode 45 is immersed in the electrolytic solution f in rotary stirring, as will be described below. The anode 44 and cathode 45 are connected to an external power source (not shown). The container 41 contains the electrolytic solution f, a large number of shell caps 30 to be treated, and ferromagnetic media 46 consisting of a large number of stainless steel pins and balls as polishing materials, which functions so that the shell caps 30 are maintained at a generally constant posture while polishing the shell caps 30. In addition, the shell cap 30 is made of a nonmagnetic metal.
(22) The rotating mechanism 50 includes a rotating shaft 51 having one end connected to an output portion of a motor (not shown); a rotating plate 52 connected to the other end of the rotating shaft 51; and one of more permanent magnets 53 disposed onto the rotating plate 52. As the permanent magnets 53 on the rotating plate 52 are rotated by the rotation of the rotating shaft 51, the media 46 are rotated in the container 41. Accordingly, the electrolytic solution f in the container 41 is rotatively stirred, and in this case, the liquid level of the electrolytic solution f rises from the center to the peripheral side plate 43 of the radial outside by the centrifugal force. The position of the cathode 45 is set such that the cathode 45 is immersed in the electrolytic solution f in rotary stirring.
(23) During fluidizing or flowing the media 46 and the electrolytic solution f in the container 41 by the permanent magnets 53 of the rotating mechanism 50, the media 46 is attracted downward in the container 41 by the permanent magnets 53, and the caps 30 also put on the media 46 due to the difference in specific gravity between the media 46 and the shell caps 30. In this state, the caps 30 are moving while being forced by media 46 and the electrolytic solution f. Therefore, the caps 30 during the motion are not in contact with the anode 44 basically. Further, the amount of the electrolytic solution f, the rotating speed of the rotating mechanism 50, the number of the caps 30 to be introduced, and the position of the cathode 45, and the like are set such that the cathode 45 is not basically in direct contact with the caps 30 during the motion and is immersed in the electrolytic solution f in stirring. In such a way, the caps 30 will maintain the state that is away from the anode 44 and the cathode 45 during the motion. It should be noted that the caps 30 may be temporarily contacted with the anode 44 or cathode 45 as long as the caps 30 are not in contact with the electrodes in most part of the energization period.
(24) When subjecting the shell cap 30 to the surface electrolytic treatment, the rotating mechanism 50 is rotated to rotatively flow or fluidize media 46 and the electrolytic solution f in the container 41, while passing electric current through the electrolytic solution f by applying an voltage between the anode 44 and the cathode 45. This will generate the bipolar phenomenon on each shell cap 30 in the electrolytic solution f. Each cap 30 does not have the constant posture and distance relative to the electrodes during the rotational fluidization of the media 46 and the electrolytic solution f, but each cap 30 tries to keep the position with lowest physical liquid resistance while undergoing the centrifugal force. Therefore, each cap 30 moves such that the front surface 31a of the disc portion 31 of each cap 30 averagely faces the downward anode 44 and the back surface 31b of the disc portion 31 averagely faces the upward cathode 45. So, when a certain period of time is passed, the posture and the distance of the caps 30 relative to the electrodes are substantially the same ratio in all the caps 30. After a certain period of time, the rotation of the rotating mechanism 50 and the energization are stopped. In such a way, the first metallic color is produced on the front surface 31a of the disk portion 31 of each cap 30 due to the metal deposition, and the second metallic color is produced on the back surface 31b and the inner surface of the annular side portion 32 due to the metal dissolution. Further, the third metallic color that gradually changes from the first metallic color to the second metallic color is produced on the outer surface of the annular side portion 32 of each shell cap 30. In the above treatment, each cap 30 is polished in contact with the medium 46 in the electrolytic solution f during the rotational stirring. Thus, the media 46 brings about the polishing while adjusting the posture of each cap 30. Furthermore, the media 46 stirs the electrolytic solution f, thereby facilitating the supply of metal ions to be deposited. If the treatment as stated above is carried out by changing the anode 44 to a cathode and the cathode 45 to an anode, the second metallic color will be produced on the front surface 31a of the disk portion 31 of the cap 30, and the first metallic color will be produced on the back surface 31b. In addition, the hues of the first, second and third metallic colors can be changed by altering the type and amount of the electrolytic solution f, the rotating speed of the rotating mechanism 50, the amount of the caps 30 and media 46 to be introduced, the voltage and electrical current between the electrodes, and the like. The range where the third metallic color is produced can be also changed, and for example, the third metallic color can be produced on not only the outer surface of the annular side portion 32 of the shell cap 30, but also on the outer peripheral portion of the front surface 31a of the disc portion 31.
EXAMPLES
Example 1
(25) The elements 1 for slide fasteners, which were made of brass (a copper alloy) and which did not undergo any under plating was subjected to the following surface treatment using the surface electrolytic treatment apparatus 10 shown in FIG. 1 and the like. 2000 ml of an acidic solution (pH=3.2) obtained by mixing a grain vinegar with water at a ratio of 3:17 was used as an electrolytic solution e. The electrolytic solution e was fed to the unit 20 at rate of 11 l/min by means of the solution stirring pump 12. Two parallel copper wires each having a diameter of 2 mm and a length of 160 mm were used as the anode 23, and one stainless steel wire (SUS304) having a diameter of 3 mm and a length of 160 mm was used as the cathode 24. The flow rate of the electrolytic solution in the electrolytic solution flow channel 22 between the electrodes 23 and 24 was maintained at 0.5 m/s, and a voltage of 3 V were applied to the electrodes, and pre-energization was then carried out for about 30 minutes in order to increase the copper ion concentration. The current value during the energization was 0.1 A or less. The metal fastener tapes 2 to which the elements 1 for the slide fasteners were attached were mounted as shown in FIG. 1, and the energization was performed at 3 V for about 30 minutes. The current density for the elements 1 at this time could not be determined because the calculation was difficult due to the use of the indirect (non-contact) electrodes. The temperature of the solution in the electrolytic solution flow channel 22 was 19 C. at the start of the treatment, which was increased to 20 C. at the end of the treatment. During the energization, the fastener tapes 2 were in the stopped state, and the elements 1 were in the engaged state. In such a way, the anode 23-facing side (the 1a side in FIG. 8) of the outer surface of the element 1 was changed from the initial brass color to a copper color as the first metallic color, and the cathode 24-facing side (the 1b side in FIG. 8) was changed to a dull brass color as the second metallic color. The cross section of the metallic element used herein had a width of 6 mm and a height of 2.5 mm in the engaged state. Each of the front and back surfaces of the metallic element 1 used herein was analyzed by using an energy dispersive X-ray fluorescence spectrometer, and found that on the anode 23-facing side, a copper component was 67.086%, a zinc component was 28.964%, and the balance was 3.950%. Further, on the cathode 24-facing side, a copper component was 63.561%, a zinc component was 32.065%, and the balance was 4.374%.
Example 2
(26) The metallic slide fastener elements 1 (a copper alloy) which were embedded in the fastener tapes 2 and which did not undergo any under plating were subjected to the following surface treatment using the surface electrolytic treatment apparatus 10 shown in FIG. 1 and the like. The electrolytic solution e was formed by adding 1600 ml of purified water to 400 ml of an acidic tin plating solution (Part No. BP-SN-02) from YAMAMOTO-MS Co., Ltd. The electrolytic solution e was fed to the unit 20 at rate of 11 l/min by the solution stirring pump 12. The pH value at this time was 0.8. The flow rate of the electrolytic solution in the electrolytic solution flow channel 22 between the electrodes 23 and 24 was maintained at about 0.5 m/s, and using stainless steel wires (SUS304) each having a diameter of 3 mm and a length of 160 mm as both the anode 23 and the cathode 24, a voltage of 5 V were applied to the electrodes to perform the energization for about 30 minutes. The current value during the energization was initially 2.0 A, which was finally increased to 2.5 A. At this time, the temperature of the solution was 19 C. at the start of the treatment, and was 22 C. at the end of the treatment. During the energization, the fastener tapes 2 were in the stopped state, and the elements 1 were in the engaged state. In such a way, the anode 23-facing side (the 1a side in FIG. 8) of the outer surface of the element 1 was changed from the brass color to a dull silver color (tin color) as the first metallic color, and the cathode 24-facing side (the 1b side in FIG. 8) was changed to a dull brass color as the second metallic color. The cross section of the metallic element used herein had a width of 6 mm and a height of 2.5 mm. Each of the front and back surfaces of the metallic element 1 used herein was analyzed by using an energy dispersive X-ray fluorescence spectrometer, and found that on the anode 23-facing side, a copper component was 57.940%, a zinc component was 29.779%, a tin component was 7.954%, and the balance was 4.327%. Further, on the cathode 24-facing side (the 1b in FIG. 8), a copper component was 60.854%, a zinc component was 32.538%, and the balance was 6.608%, and no tin component was detected.
Example 3
(27) The shell caps 30 made of brass (a copper alloy) were subjected to the following surface treatment using the surface electrolytic treatment apparatus 40 shown in FIG. 10. The shell caps each having a diameter of 11 mm and a height of 3 mm were used. Using 190 ml of an acidic solution (pH=3.2) obtained by mixing a grain vinegar with water at a ratio of 3:16 as the electrolytic solution f, a voltage of 9 V was applied to the electrodes and an electric current of about 100 mA was applied for about 20 minutes. A stainless steel wire (SUS304) having a diameter of 3 mm and a length of 100 mm was used as the cathode 45, and a copper wire having a diameter of 2 mm and a length of 250 mm was used as the anode 44. To the container 41 were introduced 10 g of stainless pin media each having a length of 5 mm and a diameter of 0.3 mm, and 15 g of stainless pin media each having a length of 5 mm and a diameter of 0.5 mm (total 25 g of the two media), as the media 46. Further, the rotating speed of the rotating mechanism 50 was set to 1000 rpm. The temperature of the electrolytic solution f was 14 C. at the start of the treatment, which was increased to 22 C. at the end of the treatment. In such a way, the front surface 31a of the disc portion 31 of the cap 30 was changed from the brass color to a copper color as the first metallic color, and the back surface 31 b and the inner surface of the annular side portion 32 were changed to a blackish brass color as the second metallic color. The outer side surface of the annular side portion 32 was changed to a blackish metallic color that gradually changed from the first metallic color to the second metallic color, as the third metallic color. A component analysis for the base material of the shell cap 30 before the surface treatment showed that on the front surface 31a side, a copper component was 66.563%, a zinc component was 33.293%, and the balance was 0.144%, and that on the back surface 31b side, a copper component was 66.478%, a zinc component was 33.381%, and the balance was 0.141%, and that both the front and back surfaces had substantially the same component ratio. The same component analysis for the cap 30 after the surface treatment showed that on the front surface 31a side, a copper component was 67.607%, a zinc component was 32.281%, and the balance was 0.112%, and that on the back surface 31b side, a copper component was 66.486%, a zinc component was 33.411%, and the balance was 0.103%.
Example 4
(28) The shell caps 30 made of brass (a copper alloy) were subjected to the following surface treatment using the surface electrolytic treatment apparatus 40 shown in FIG. 10. Ten shell caps each having a diameter of 11 mm and a height of 3 mm were used. Using 200 ml of an acidic solution (pH=2.9) obtained by adding 100 cc of purified water to 100 cc of an acidic nickel plating solution (Part No. BP-NI-01) from YAMAMOTO-MS Co., Ltd., as the electrolytic solution f, a voltage of 16 V was applied to the electrodes and an electric current of about 5.5 A was applied for about 10 minutes. A stainless steel wire (SUS304) having a diameter of 3 mm and a length of 100 mm was used as the cathode 45, and a copper wire having a diameter of 2 mm and a length of 250 mm was used as the anode 44. To the container 41 were added 10 g of stainless pin media each having a length of 5 mm and a diameter of 0.3 mm and 15 g of stainless pin media each having a length of 5 mm and a diameter of 0.5 mm (total 25 g of the two media), as the media 46. Further, the rotating speed of the rotating mechanism 50 was set to 1000 rpm. The temperature of the electrolytic solution f was 14 C. at the start of the treatment, which was increased to 31 C. at the end of the treatment. In such a way, the front surface 31a of the disc portion 31 of the cap 30 was changed from the brass color to a nickel color as the first metallic color, and the back surface 31 b and the inner surface of the annular side portion 32 were changed to a whitish dull brass color as the second metallic color, and further the outer side surface of the annular side portion 32 was changed to a metallic color including a blackish copper color that gradually changed from the first metallic color to the second metallic color, as the third metallic color. The base material of the shell cap 30 used in this Example was the same as that of Example 3. A surface component analysis after the surface treatment showed that on the front surface 31a side, a copper component was 68.480%, a zinc component was 29.555%, a nickel component was 1.825% and the balance was 0.140%, and that on the back surface 31b side, a copper component was 66.420%, a zinc component was 33.397%, and the balance was 0.183%. The results demonstrated that on the front surface 31a side, the copper component was increased as well as the nickel component was detected, and on the back surface 31b side, no nickel component was detected and there was no significant change from the base material component.
(29) The shell cap 30 is used after being put over the button mounting member body 33, for example, as a part of the button mounting member shown in FIG. 11. More particularly, the button mounting member body 33 includes a circular base portion 33a and the shaft portion 33b, and the cap 30 covers the upper surface of the base portion 33a of the body 33, and is attached by curving the annular side portion 32 downward relative to the disc portion 33a of the body 33. Therefore, any plating is not originally required for the back surface 31b of the disc portion 31 and the inner surface of the annular side portion 32, but in the prior art plating method, the costs were increased for the reasons that the masking was necessary in order to apply one side plating, and the like. In this regard, the surface electrolytic treatment method according to the present invention can apply the bipolar plating only onto the front surface 31a of the disk portion 31 of the shell cap 30 (and the outer surface of the annular side portion 32), thereby cost-effectively perform the one side plating by reducing the amount of the plating metal. For the treatment with the surface electrolytic treatment apparatus 40, the shell cap 30 has been illustrated as the garment accessory, but only the button mounting member body 33, or the button mounting member with the cap 30 and the mounting member body 33 assembled as shown in FIG. 11 can be subjected to the surface electrolytic treatment with the surface electrolytic treatment apparatus 40. Circular buttons such as the metallic male snap button 60 (see FIG. 12), the female snap button (see FIG. 13), or decorative buttons such as rivet burrs and eyelets (not shown), which will have a shape such that the posture is constant when immersed in the solution, do not require any supporting member, and the sliders and the pull tabs for the slide fasteners and hook eyes and the like can be also treated in substantially the same manner by using the supporting member. The male snap button shown in FIG. 12 is provided with a projection 61 and a base 62. Female snap 70 shown in FIG. 13 includes a projection receiving portion 71 and a spring 72.
DESCRIPTION OF REFERENCE NUMERALS
(30) 1 element for a slide fastener 2 fastener tape 1a first metallic color 1b second metallic color 1c third metallic color 10, 40 surface electrolytic treatment apparatus 11 electrolytic solution bath 12 pump 13 circulation path 20 bipolar plating unit 22 electrolytic solution flow channel 23,44 anode 24,45 cathode 30 shell cap 41 container 46 ferromagnetic pin media 50 rotating mechanism 53 permanent magnet e, f electrolytic solution
