A fluid-impervious slide fastener is disposed; an covering abutting member is formed in a central slit of a pair of support tapes, the covering abutting member has a first covering body having a covering layer and a second covering body having a covering layer; when the fluid-impervious slide fastener is in a coupled status, the first covering body and the second covering body are able to elastically abut against each other so as to form a tightening deformation, thus the central slit is provided with a fluid-impervious function against a fluid, for example a liquid, of capable of bearing a hydrostatic pressure of 30 gf/cm.sup.2.

A fluid-impervious slide fastener is disposed; an covering abutting member is formed in a central slit of a pair of support tapes, the covering abutting member has a first covering body having a covering layer and a second covering body having a covering layer; when the fluid-impervious slide fastener is in a coupled status, the first covering body and the second covering body are able to elastically abut against each other so as to form a tightening deformation, thus the central slit is provided with a fluid-impervious function against a fluid, for example a liquid, of capable of bearing a hydrostatic pressure of 30 gf/cm.sup.2.

A ventilation device including a flexible support having first and second edges delimiting a longitudinal opening and being provided with first and second closing devices arranged to cooperate with one another, the ventilation device including at least one elastic spacer member which includes a first tab extending along the first edge and a second tab extending along the second edge, the elastic spacer member being constrained when the closing devices are in the closed position, so that the first and second tabs tend to separate from one another, the length of at least the first tab being less than half the length of the first edge.

A ventilation device including a flexible support having first and second edges delimiting a longitudinal opening and being provided with first and second closing devices arranged to cooperate with one another, the ventilation device including at least one elastic spacer member which includes a first tab extending along the first edge and a second tab extending along the second edge, the elastic spacer member being constrained when the closing devices are in the closed position, so that the first and second tabs tend to separate from one another, the length of at least the first tab being less than half the length of the first edge.

A multi airtight type rail zipper may be attached to or installed on a flexible material, such as an envelope, for storing an object. The multi airtight type rail zipper includes a first zipper rail, a second zipper rail formed in a shape corresponding to that of the first zipper rail, and a slider provided to surround the first zipper rail and the second zipper rail such that, according to the direction of sliding movement, the first zipper rail and the second zipper rail engage with and are fastened to each other, or disengage and are unfastened from each other. The multi airtight type rail zipper can improve the sealing force by the more stable fastening structure.

A multi airtight type rail zipper may be attached to or installed on a flexible material, such as an envelope, for storing an object. The multi airtight type rail zipper includes a first zipper rail, a second zipper rail formed in a shape corresponding to that of the first zipper rail, and a slider provided to surround the first zipper rail and the second zipper rail such that, according to the direction of sliding movement, the first zipper rail and the second zipper rail engage with and are fastened to each other, or disengage and are unfastened from each other. The multi airtight type rail zipper can improve the sealing force by the more stable fastening structure.

An anti-pinch zipper includes two zipper tapes and a zipper slider. The inner side of the chain cloth of each zipper tape is folded back to the front to form a chain belt portion and a sliding space. The zipper slider has a top plate that holds the pull tab and is provided with a structure to guide the two rows of teeth of the zipper tapes to be interlocked with each other. The rows of teeth and the chain belt portions are passed through the zipper slider, so that the top plate and the pull tab are located on the front of the zipper, and the two chain cloths cover the back of the zipper slider.

An anti-pinch zipper includes two zipper tapes and a zipper slider. The inner side of the chain cloth of each zipper tape is folded back to the front to form a chain belt portion and a sliding space. The zipper slider has a top plate that holds the pull tab and is provided with a structure to guide the two rows of teeth of the zipper tapes to be interlocked with each other. The rows of teeth and the chain belt portions are passed through the zipper slider, so that the top plate and the pull tab are located on the front of the zipper, and the two chain cloths cover the back of the zipper slider.

Provided is a metallic fastener member which has a specific color, i.e., a light gold color, and has all of practical strength, unsusceptibility to discoloration, and processability. The metallic fastener member comprises, as the base material, a copper alloy having a composition which contains 1-30 mass % Zn and 1-11 mass % Ni, with the remainder comprising Cu and unavoidable impurities, and has a Vickers hardness of 120 Hv or greater but less than 220 Hv.

Provided is a metallic fastener member which has a specific color, i.e., a light gold color, and has all of practical strength, unsusceptibility to discoloration, and processability. The metallic fastener member comprises, as the base material, a copper alloy having a composition which contains 1-30 mass % Zn and 1-11 mass % Ni, with the remainder comprising Cu and unavoidable impurities, and has a Vickers hardness of 120 Hv or greater but less than 220 Hv.