Ykk Corporation

Takahiro Fukuyama

Atsushi Ogihara

Yasuharu Yoshimura

Kouta Kido

Chikako Hiromi

Takuya Koizumi

Takanori Kumei

Yoshio Taira

Koichi Mikado

Muneyoshi Yokota

Kazuhiko Kita

Tetsuya Katsumi

Futoshi Kozato

Massimiliano Di Girolami

Yusuke Meiwa

Yasuhiko Sugimoto

Hayato Ishii

Itaru Hasegawa

Kazuya Akitsu

Jun Kiyohara

Tatewaki Ido

Kousuke Seki

Takuro Hayashi

Masamichi Yamagata

Kouichi Mikado

Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a &#x3b2; phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a &#x3b2; phase at a ratio of 10% or less.

Copper alloy fastener element and slide fastener

Elements for a slide fastener are provided, which have high strength and improved abrasion resistance. More particularly, an element for a slide fastener includes as a base material, an aluminum alloy having a composition represented by a general formula: AlSiCuMgin which a, b, c and d are expressed in percentage by mass, a denotes a balance, 0.4&#x2264;b&#x2264;0.9, 0.15&#x2264;c&#x2264;0.8, 0.8&#x2264;d&#x2264;2.0, and unavoidable impurity elements may be contained; and the aluminum alloy containing a precipitate containing Mg and Si.

Element for slide fastener

A copper alloy for fastening wherein the alloy has a structure of a mixture of &#x3b1;-phase and a &#x3b2;-phase; and wherein the alloy has a composition represented by the general formula: CuZnMn, where bal., a, and b are expressed in % by mass, bal. represents the balance, 34&#x2264;a&#x2264;40.5, 0.1&#x2264;b&#x2264;6, and inevitable impurities may be contained; and the composition satisfying the equation (1): b&#x2265;(&#x2212;8a+300)/7, where 34&#x2264;a&#x3c;37.5 and equation (2): b&#x2264;(&#x2212;5.5a+225.25)/5, where 35.5&#x2264;a&#x2264;40.5.

Fastening copper alloy

A metallic fastener member has a specific color of light gold and also has high strength, discoloration resistance and high workability to withstand practical use. A metallic fastener member including a base material of a copper alloy having composition containing 1 to 30% by mass of Zn and 1 to 11% by mass of Ni, the balance being Cu and inevitable impurities, wherein the metallic fastener member has a Vickers hardness of Hv 120 or more and less than Hv 220.

Metallic fastener member having light gold color, and fastener provided therewith

There is provided a stop for a slide fastener. A top plate and a bottom plate are linked with one another at a transversely intermediate position by an integral connecting post. The lower side of the top plate is substantially flat. The bottom plate slopes away from the connecting post to form two leg members provided with a respective end flange pointing towards the top plate, the leg members being adapted to cooperate in use with the top plate to retain fastener tapes therebetween.

Stop for a slide fastener, and a method for the manufacture thereof

A copper-zinc alloy product of the invention contains zinc in an amount of higher than 35% by weight and 43% by weight or less and has a two-phase structure of an &#x3b1;-phase and a &#x3b2;-phase. Further, the ratio of the &#x3b2;-phase in the copper-zinc alloy is controlled to be higher than 10% and less than 40% and the crystal grains of the &#x3b1;-phase and the &#x3b2;-phase are crushed into a flat shape and arranged in a layer shape through cold working. According to the copper-zinc alloy product, it is possible to decrease the copper content and to appropriately secure the strength and cold workability by appropriately controlling the ratio of the &#x3b2;-phase.

Copper-zinc alloy product and process for producing copper-zinc alloy product

A nickel-free white copper alloy represented by the general formula: Cu Zn Mn Al or Cu Zn Mn Al X , wherein X is at least one element selected from the group consisting of Si, Ti and Cr; b, c, d and e are 0.5&lE;b<5, 7&lE;c&lE;17, 0.5&lE;d&lE;4 and 0<e&lE;0.3 in terms of % by weight; a is the balance, the alloy incidentally including unavoidable elements. The alloy is free from allergic problems, which may be caused by nickel, and has excellent strength, hardness, ductility, workability and corrosion resistance, suitable for use in elements, sliders, stoppers or the like for slide fasteners, or accessories such as metallic buttons, fasteners or the like for clothes.

Nickel-free white copper alloy

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Toyama, Japan

Takahiro Fukuyama