# US 2018/0020784 A1 · Double-Layered Watertight Zipper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0020784 A1 - Document ID: US20180020784A1 - Status: Published application - Kind: A1 - Application number: 15/466,982 - Filed: 2017-03-23 - Published: 2018-01-25 - Earliest claimed: 2016-07-20 - Assignees: Unitech Zipper & Machinery Co., Ltd. - Applicants: Unitech Zipper & Machinery Co., Ltd. - Inventors: Jung-Yuan Cheng - Web page: https://patentgrep.com/patent/US20180020784A1 ## CPC - A44B 19/32: Means for making slide fasteners gas or watertight - A44B 19/06: with substantially rectangular members having interlocking projections and pieces - A44B 19/08: Stringers arranged side-by-side when fastened, e.g. at least partially superposed stringers - A44B 19/24: Details - A44B 19/42: Making by processes not fully provided for in one other class, e.g. B21D53/50, B21F45/18, B22D17/16, B29D5/00 {(attaching closure devices, e.g. slide fasteners, to bags B31B70/813; making package opening by applying or incorporating profile strips, e.g. for reclosable bags B65B61/188)} - A44B: BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE (fastenings specially adapted for footwear A43C) ## Abstract A double-layered watertight zipper is provided to improve the watertight effect of the conventional zipper. The watertight zipper includes first and second stringer tapes. Each stringer tape includes a tape, a first leakproof layer, a plurality of scoops and a second leakproof layer. The first leakproof layer and the tape construct a waterproof tape. The first leakproof layer includes an inner face forming a first abutting face. The scoops are arranged on the waterproof tape. The second leakproof layer is arranged on the scoops and connected to the first leakproof layer. The second leakproof layer includes an inner face forming a second abutting face. When the scoops of the first and second stringer tapes are engaged with each other, the first abutting faces of the first and second stringer tapes abut with each other, and the second abutting faces of the first and second stringer tapes abut with each other. ## Claims ### Claim 1 A double-layered watertight zipper comprising first and second stringer tapes that can be engaged with each other, wherein each of the first and second stringer tapes comprises: a tape; a first leakproof layer arranged on an outer face of the stringer tape, wherein the first leakproof layer and the tape construct a waterproof tape, wherein the first leakproof layer comprises an inner face forming a first abutting face; a plurality of scoops arranged on the waterproof tape in intervals side by side adjacent to an inner lateral side of the waterproof tape; and a second leakproof layer arranged on the plurality of scoops and connected to the first leakproof layer, wherein the second leakproof layer comprises an inner face forming a second abutting face; wherein, when the plurality of scoops of the first stringer tape is engaged with the plurality of scoops of the second stringer tape, the first abutting face of the first stringer tape is in abutment with the first abutting face of the second stringer tape, and the second abutting face of the first stringer tape is in abutment with the second abutting face of the second stringer tape. ### Claim 2 (depends on 1) The double-layered watertight zipper as claimed in claim 1, wherein each of the plurality of scoops comprises a first scoop portion and a second scoop portion, wherein the first scoop portion comprises a head portion, a waist portion and a tail portion connected in sequence, wherein the head portion comprises a free end extending beyond the first abutting face of the first leakproof layer, wherein the waist portion forms a groove, wherein an inner stopper wall is formed at a side of the waist portion adjacent to the head portion, and an outer stopper wall is formed at another side of the waist portion adjacent to the tail portion, wherein the outer stopper wall is higher than the inner stopper wall, wherein the second leakproof layer comprises an outer end face opposite to the second abutting face, wherein the waist portions of the plurality of scoops form a plurality of spaces therebetween, wherein the plurality of spaces and the grooves of the plurality of scoops are filled with the second leakproof layer, and wherein the outer end face of the second leakproof layer is connected to the outer stopper walls of the first scoop portions. ### Claim 3 (depends on 2) The double-layered watertight zipper as claimed in claim 2, wherein the second abutting face of the second leakproof layer flushes with the first abutting face of the first leakproof layer in a thickness direction of the tape. ### Claim 4 (depends on 2) The double-layered watertight zipper as claimed in claim 2, wherein each of two ends of the waist portion forms a concave portion. ### Claim 5 (depends on 2) The double-layered watertight zipper as claimed in claim 2, wherein the head portion of the first scoop portion comprises a positioning hole. ### Claim 6 (depends on 5) The double-layered watertight zipper as claimed in claim 5, wherein the positioning hole extends through the head portion, wherein the first leakproof layer at a bottom end of the positioning hole is exposed from the positioning hole. ### Claim 7 (depends on 1) The double-layered watertight zipper as claimed in claim 1, wherein the second leakproof layer is formed by injection molding. ### Claim 8 (depends on 2) The double-layered watertight zipper as claimed in claim 2, wherein the second leakproof layer is formed by injection molding. ### Claim 9 (depends on 3) The double-layered watertight zipper as claimed in claim 3, wherein the second leakproof layer is formed by injection molding. ### Claim 10 (depends on 4) The double-layered watertight zipper as claimed in claim 4, wherein the second leakproof layer is formed by injection molding. ### Claim 11 (depends on 5) The double-layered watertight zipper as claimed in claim 5, wherein the second leakproof layer is formed by injection molding. ### Claim 12 (depends on 6) The double-layered watertight zipper as claimed in claim 6, wherein the second leakproof layer is formed by injection molding. ### Claim 13 (depends on 7) The double-layered watertight zipper as claimed in claim 7, wherein the first and second leakproof layers are made of a same material or the second leakproof layer has a higher melting point than the first leakproof layer. ### Claim 14 (depends on 7) The double-layered watertight zipper as claimed in claim 7, wherein the head portion comprises a root end connecting to the waist portion, as well as the free end opposite to the root end, wherein the head portions of the first scoop portions of two adjacent ones of the plurality of scoops are spaced from each other in an increasing distance from the root ends to the free ends thereof. ### Claim 15 (depends on 8) The double-layered watertight zipper as claimed in claim 8, wherein the first scoop portion comprises a base, a tongue and a limiting wall, wherein the base is connected to the first leakproof layer and the second scoop portion, wherein the tongue is connected to a top of the base, wherein the limiting wall is connected to an end of the base and is higher than the base, wherein the groove is formed between an outer end face of the tongue and the limiting wall, wherein the outer end face of the tongue forms an inner stopper wall, and a face of the limiting wall facing the groove forms the outer stopper wall, wherein the head portion comprises a root end connecting to the groove, as well as the free end opposite to the root end, wherein the tongues of the first scoop portions of two adjacent ones of the plurality of scoops are spaced from each other in a constant distance from the root ends to the free ends of the head portions. ### Claim 16 (depends on 8) The double-layered watertight zipper as claimed in claim 8, wherein the first scoop portion comprises a base, a tongue and a limiting wall, wherein the base is connected to the first leakproof layer and the second scoop portion, wherein the tongue is connected to a top of the base, wherein the limiting wall is connected to an end of the base and is higher than the base, wherein the groove is formed between an outer end face of the tongue and the limiting wall, wherein the outer end face of the tongue forms an inner stopper wall, and a face of the limiting wall facing the groove forms the outer stopper wall, wherein the head portion comprises a root end connecting to the groove, as well as the free end opposite to the root end, wherein the tongues of the first scoop portions of two adjacent ones of the plurality of scoops are spaced from each other in an increasing distance from the root ends to the free ends of the head portions. ### Claim 17 (depends on 15) The double-layered watertight zipper as claimed in claim 15, wherein a portion of the base at the groove forms the waist portion of the first scoop portion, wherein the remaining portion of the base and the tongue form the head portion of the first scoop portion, wherein the head portion of the first scoop portion comprises a neck portion corresponding to the base, wherein the neck portion has a width in a length direction of the tape, and the width of the neck portion is smaller than a width of a free end of the base in the length direction of the tape. ### Claim 18 (depends on 17) The double-layered watertight zipper as claimed in claim 17, wherein the second scoop portion has a same structure as the first scoop portion. ### Claim 19 (depends on 15) The double-layered watertight zipper as claimed in claim 15, wherein the tongue comprises two inclined guiding faces at a free end thereof, and the two inclined guiding faces are spaced from each other in the length direction of the tape.