A waterproof zipper with at least one curve includes a first tape and a second tape, and interlocking elements attached to the first tape and the second tape, wherein the first tape and the second tape are curved, and wherein a curve of at least one of the tapes was caused by compaction of that tape. The zipper is coated on at least one side with a fluid impervious coating.

An element member (10) according to the invention includes a fixing member (11) and a plurality of fastener elements (20, 20a, 20b) attached to the fixing member (11), characterized in that the fastener element (20, 20a, 20b) includes an element fixing portion (22) fixed to the fixing member (11), a coupling portion (23) extending from the element fixing portion (22) in a width direction, and a fin portion (24, 25, 26) extending from the element fixing portion (22) to a side opposite to the coupling portion (23).

The fastener element (20, 20a, 20b) is fixed to the fixing member (11) only at the element fixing portion (22). As a result, in a slide fastener-attached product (1) manufactured by using the element member (10), the orientation of the fastener element (20, 20a, 20b) is prevented from being tilted with respect to a fastener attached member (2) and smooth sliding operation of a slider (40) can be ensured.

An element member (10) according to the invention includes a fixing member (11) and a plurality of fastener elements (20, 20a, 20b) attached to the fixing member (11), characterized in that the fastener element (20, 20a, 20b) includes an element fixing portion (22) fixed to the fixing member (11), a coupling portion (23) extending from the element fixing portion (22) in a width direction, and a fin portion (24, 25, 26) extending from the element fixing portion (22) to a side opposite to the coupling portion (23).

The fastener element (20, 20a, 20b) is fixed to the fixing member (11) only at the element fixing portion (22). As a result, in a slide fastener-attached product (1) manufactured by using the element member (10), the orientation of the fastener element (20, 20a, 20b) is prevented from being tilted with respect to a fastener attached member (2) and smooth sliding operation of a slider (40) can be ensured.

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 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.

Legs of a pair of legs are provided with core-thread-pressing surfaces that slant gradually to approach one another as being away from the stopping surfaces. Each core-thread-pressing surface extends from the stopping surface to the base end of the leg. A thickness of each leg in a thickness direction of the fastener tape gradually increases from the free end toward the base end of the leg in accordance with at least the slanting of the core-thread-pressing surface.

Legs of a pair of legs are provided with core-thread-pressing surfaces that slant gradually to approach one another as being away from the stopping surfaces. Each core-thread-pressing surface extends from the stopping surface to the base end of the leg. A thickness of each leg in a thickness direction of the fastener tape gradually increases from the free end toward the base end of the leg in accordance with at least the slanting of the core-thread-pressing surface.

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.