TWI839938B - Zipper - Google Patents

Abstract

The zipper (1) of the present invention comprises a pair of first and second zipper tapes (10, 20), a first chain tooth row (50) and a second chain tooth row (60). When the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, an end portion (10a) in the width direction of the first zipper tape (10) and an end portion (20a) in the width direction of the second zipper tape (20) are respectively bent into an arc shape and closely contact each other.

Description

Zipper

The present invention relates to a zipper.

As types of zippers, generally known are: a normal type of zipper in which the chain teeth are attached to the outside (front) of the product so that the chain teeth are visible; a reverse type of zipper in which the chain teeth are attached to the inside (back) of the product so that they are difficult to see (so-called reverse zipper); and a hidden type of zipper in which the side edges of the left and right zipper tapes are folded back in a U-shape in the width direction and the chain teeth are attached to the folded tape portion (so-called hidden zipper).

The reverse zipper has the advantage of not hindering the design of the product due to its concealedness, and is suitable for various products such as clothes, shoes, bags, furniture, etc. In addition, in recent years, it is also used for various seat covers for cars, trains, airplanes, etc. An example of such a reverse zipper is disclosed in Japanese Patent Publication No. 2009-56076 (Patent Document 1).

Fig. 8 is a cross-sectional view showing the reverse zipper of Patent Document 1. As shown in Fig. 8, the reverse zipper 100 disclosed in Patent Document 1 has a pair of left and right zipper tapes 102, 102, and a slider 101 capable of opening and closing the pair of left and right zipper tapes 102, 102.

The slider 101 has a slider body 110 and a pull tab 120. The slider body 110 has an upper wing plate 111, a lower wing plate 112 that is separated from and arranged in parallel with the upper wing plate 111, a guide post (not shown in FIG. 8 ) that connects the front ends of the upper and lower wing plates 111 and 112, a pull tab mounting post 114 that is formed in a door-like shape integrally with the surface (upper surface) of the upper wing plate 111, and left and right flanges 115 that are vertically arranged from the left and right side edges of the rear side of the lower wing plate 112 toward the upper wing plate 111.

The left and right zipper tapes 102, 102 are formed by inserting a core wire 106 through a coil-shaped chain element row 103 using a sewing thread 105 and sewing the same to the opposite side edges of the left and right zipper tapes 104, 104. [Prior technical literature] [Patent literature]

Patent document 1: Japanese Patent Publication No. 2009-56076

[The problem that the invention wants to solve]

Generally, in a reverse zipper, a gap (so-called middle partition) is formed between the left and right zipper tapes. In fact, even in the reverse zipper 100 of Patent Document 1 shown in FIG. 8 , a gap S is formed between the left and right zipper tapes 104, 104.

Therefore, when an external force in directions away from each other (so-called lateral pulling) acts on the left and right zipper tapes 104, 104, when the user observes the reverse zipper 100 from the surface side (the upper side in FIG. 8), the chain element row 103 can be seen through the gap S. This reduction in the concealment of the chain element row 103 deteriorates the design of articles using the reverse zipper 100, especially articles such as car seats, bags, and furniture that emphasize aesthetics, and is not preferred in this respect.

The present invention is made in view of the above-mentioned problems, and its purpose is to provide a zipper with excellent concealment of the chain teeth and thus excellent appearance. [Means for solving the problem]

In order to solve the above-mentioned problem, the present invention is realized by the following structure. [1] A zipper, comprising: a pair of first zipper tape and second zipper tape, each of which is in the shape of an elongated strip and has a first main surface and a second main surface on the opposite side of the first main surface; a first chain tooth row, which is arranged on the first main surface at one end of the first zipper tape in the width direction; and a second chain tooth row, which is arranged on the first main surface at one end of the second zipper tape in the width direction, and in the zipper, when the first chain tooth row and the second chain tooth row are engaged with each other, the end of the first zipper tape in the width direction and the end of the second zipper tape in the width direction are respectively bent into an arc shape and closely contact each other. [2] The zipper according to [1], characterized in that, when the first chain element row and the second chain element row are engaged with each other, the second main surface at one end of the first zipper tape in the width direction and the second main surface at one end of the second zipper tape in the width direction are in close contact with each other. [3] The zipper according to [1] or [2], characterized in that, when the first chain element row and the second chain element row are engaged with each other, a first space is formed between the first main surface at one end of the first zipper tape in the width direction and the first chain element row, and a second space is formed between the first main surface at one end of the second zipper tape in the width direction and the second chain element row. [4] The zipper according to [1] or [2], characterized in that: The first zipper tape and the second zipper tape are woven or knitted fabrics. [5] The zipper according to [1] or [2], characterized in that: One end of the first zipper tape in the width direction extends further toward the second zipper tape than the center of engagement of the first chain element row and the second chain element row, and one end of the second zipper tape in the width direction extends further toward the first zipper tape than the center of engagement, so that when the first chain element row and the second chain element row are engaged with each other, one end of the first zipper tape in the width direction and one end of the second zipper tape in the width direction are bent into an arc shape and closely contact each other. [6] The zipper according to [5] is characterized in that: an end face of the first zipper tape in the width direction and an end face of the first chain tooth row in the width direction are arranged on the same plane, and an end face of the second zipper tape in the width direction and an end face of the second chain tooth row in the width direction are arranged on the same plane, so that when the first chain tooth row and the second chain tooth row are engaged with each other, an end face of the first zipper tape in the width direction and an end face of the second zipper tape in the width direction are bent into an arc shape and closely contact each other. [7] The zipper according to [1] or [2] is characterized in that it includes: a first water stop layer provided on the second main surface of the first zipper tape; and a second water stop layer provided on the second main surface of the second zipper tape. [8] The zipper according to [7] is characterized in that, when the first chain element row and the second chain element row are engaged with each other, one end of the first water stop layer in the width direction and one end of the second water stop layer in the width direction are bent into an arc shape and closely contact each other. [9] The zipper according to [8] is characterized in that, the first water stop layer and the second water stop layer respectively include: a first water stop main surface, which is in contact with the second main surface of the first zipper tape and the second zipper tape; and a second water stop main surface, which is the opposite side of the first water stop main surface, and when the first chain element row and the second chain element row are engaged with each other, the second water stop main surface at one end of the first water stop layer in the width direction and the second water stop main surface at one end of the second water stop layer in the width direction are closely contacted with each other. [Effect of the invention]

According to the zipper of the present invention, when the first chain element row and the second chain element row are engaged with each other, one end portion of the first zipper tape in the width direction and one end portion of the second zipper tape in the width direction are respectively bent into an arc shape and closely contact each other. Therefore, the gap (middle partition) between the first zipper tape and the second zipper tape disappears, the concealment of the chain element row is excellent, and thus the appearance is excellent.

The following is a detailed description of the zipper of each embodiment of the present invention based on the diagram. In addition, in this specification, the so-called "upward and downward direction" for the zipper is the sliding direction of the slider, and refers to the long side direction of the zipper. In particular, the direction in which the slider slides so that the left and right chain teeth are engaged is set as "upward", and the direction in which the slider slides so that the left and right chain teeth are separated is set as "downward". In addition, the so-called "left and right direction" for the zipper is the direction in which a pair of chain teeth are arranged, and is a direction orthogonal to the sliding direction of the slider, and can also be said to be the width direction of the zipper. Furthermore, the so-called "front and back direction" for the zipper and the upper stopper is a direction orthogonal to the upward and downward direction and the left and right direction, and can also be said to be the thickness direction of the zipper tape or the height direction of the chain teeth.

(First embodiment) Fig. 1 is a surface view of the first embodiment of the zipper of the present invention. Fig. 2 is a cross-sectional view of the main part of the zipper shown in Fig. 1, and is a view showing a state where the first chain element row and the second chain element row are engaged. Fig. 3 is a cross-sectional view of the main part of the zipper shown in Fig. 1, and is a view showing a state where the first chain element row and the second chain element row are separated.

As shown in FIGS. 1 to 3 , the zipper 1 of the present embodiment includes a pair of left and right zipper tapes 3 and 5 , and a slider 40 capable of opening and closing the pair of left and right zipper tapes 3 and 5 .

The left and right pair of zipper tapes 3, 5 include: a left and right pair of first zipper tapes 10 and second zipper tapes 20, which are in the shape of elongated strips and respectively have a back side 11, a back side 21 (a first main surface) and a surface 13, a surface 23 (a second main surface) on the opposite sides of the back side 11 and the back side 21; a first chain tooth row 50, which is arranged on the back side 11 of one end 10a of the first zipper tape 10 in the width direction (the right end in FIG. 2); and a second chain tooth row 60, which is arranged on the back side 21 of one end 20a of the second zipper tape 20 in the width direction (the left end in FIG. 2). Thereafter, the side of the first zipper tape 10 and the second zipper tape 20 in the width direction where the chain element row is provided is defined as one end side in the width direction, and the side where the chain element row is not provided is defined as the other end side in the width direction.

The first zipper tape 10 and the second zipper tape 20 are woven or knitted fabrics including polyester yarns and are excellent in flexibility. In addition, the first zipper tape 10 and the second zipper tape 20 may also be non-woven fabrics.

The slider 40 engages and separates a pair of left and right first chain teeth 50 and a second chain teeth 60. The slider 40 includes a main body 41, a pull-tab mounting portion 42 disposed on the surface of the main body 41, and a pull-tab 43 mounted on the pull-tab mounting portion 42. Moreover, by moving the slider 40 upward, as shown in FIG. 2, the pair of left and right first chain teeth 50 and the second chain teeth 60 engage, and by moving the slider 40 downward, as shown in FIG. 3, the pair of left and right first chain teeth 50 and the second chain teeth 60 separate. In addition, the zipper 1 may also include an upper stop or a lower stop not shown. In addition, an opening member having a seat rod and a seat body may be provided instead of the lower stop.

The first chain element row 50 and the second chain element row 60 are coil-shaped zipper element rows formed by winding a single filament made of synthetic resin in a certain direction, and have a plurality of chain elements 31. In addition, the first chain element row 50 and the second chain element row 60 are sewn on the back surface 11 of one end portion 10a in the width direction of the first zipper tape 10 and the back surface 21 of one end portion 20a in the width direction of the second zipper tape 20 by inserting a core wire 32 into the interior of the plurality of chain elements 31. The first chain element row 50 and the second chain element row 60 are sewn on the back surface 11 of one end portion 10a in the width direction of the first zipper tape 10 and the back surface 21 of one end portion 20a in the width direction of the second zipper tape 20 by using a sewing thread 33 through double thread sewing. In addition, as the synthetic resin material of the single filament, polyester and nylon can be listed.

The chain tooth 31 includes: a locking head portion 31a, which locks with and separates from the other chain tooth 31; a first leg portion 31b, which extends from the front side end portion of the locking head portion 31a to the other end side in the width direction and contacts the first zipper tape 10 and the second zipper tape 20; a second leg portion 31c, which extends from the back side end portion of the locking head portion 31a to the other end side in the width direction and does not contact the first zipper tape 10 and the second zipper tape 20; and a connecting portion 31d, which connects the outer end portion in the width direction of the first leg portion 31b to the other end portion in the width direction of the second leg portion 31c of the adjacent chain tooth 31. Therefore, the first leg portion 31b and the second leg portion 31c are formed to protrude from the engaging head portion 31a and extend in parallel.

FIG. 2 shows the engagement center O of the first chain element row 50 and the second chain element row 60. The engagement center O is the center position when the chain elements 31 and 31 are engaged with each other, and coincides with the center in the width direction of the zipper 1. In FIG. 3 , the positions of the engagement center O when the first chain element row 50 and the second chain element row 60 are engaged are shown as O1 and O2. Positions O1 and O2 are located on the other end side in the width direction of the engagement head portion 31a of the chain element 31.

As shown in FIG. 3 , when the first chain element row 50 and the second chain element row 60 are separated, the one end portion 10 a in the width direction of the first zipper tape 10 and the one end portion 20 a in the width direction of the second zipper tape 20 are separated from each other in the width direction.

In addition, in the upper part of FIG. 1 , in the state where the first chain element row 50 and the second chain element row 60 are separated, the one end portion 10a in the width direction of the first zipper tape 10 and the one end portion 20a in the width direction of the second zipper tape 20 are shown to be bent into an arc shape, which means that when the first chain element row 50 and the second chain element row 60 are separated after a certain period of time in the state of being engaged, a trace of the bent state remains. When a certain period of time has passed in the state where the first chain element row 50 and the second chain element row 60 are separated, the trace of the buckling is eliminated, and the one end portion 10a in the width direction of the first zipper tape 10 and the one end portion 20a in the width direction of the second zipper tape 20 sometimes become a roughly flat shape as shown in FIG. 3 .

As shown in FIG3 , when the first chain element row 50 and the second chain element row 60 are separated, the one end portion 10a in the width direction of the first zipper tape 10 extends further toward the second zipper tape 20 side (one end side in the width direction) than the position O1 which is the engagement center O of the first chain element row 50 and the second chain element row 60, and the one end portion 20a in the width direction of the second zipper tape 20 extends further toward the first zipper tape 10 side (one end side in the width direction) than the position O2 which is the engagement center O. That is, it is designed so that when the first chain element row 50 and the second chain element row 60 are engaged as shown in FIG2 , the first zipper tape 10 and the second zipper tape 20 overlap with the engagement center O. By configuring the first zipper tape 10 and the second zipper tape 20 and the first chain element row 50 and the second chain element row 60 as described above, when the first chain element row 50 and the second chain element row 60 are engaged as described later, the first zipper tape 10 and the second zipper tape 20 can be bent into an arc shape and closely contact each other.

In more detail, when the first chain tooth row 50 and the second chain tooth row 60 are separated, an end surface 10b of the first zipper tape 10 in the width direction is arranged on a side closer to the second zipper tape 20 than a position O1 which becomes the engagement center O (one end side in the width direction), and an end surface 20b of the second zipper tape 20 in the width direction is arranged on a side closer to the first zipper tape 10 than a position O2 which becomes the engagement center O (one end side in the width direction).

The widthwise end face 10b of the first zipper tape 10 may be arranged at a position overlapping at least a portion of the engaging head portion 31a of the chain element 31 in the widthwise direction, may be arranged on the same plane S1 as the widthwise end face 31e of the engaging head portion 31a (i.e., the widthwise end face of the first chain element row 50), or may be arranged closer to the second zipper tape 20 than the engaging head portion 31a. In the example of FIG. 2 , the widthwise end face 10b of the first zipper tape 10 is arranged on the same plane S1 as the widthwise end face of the first chain element row 50 in the widthwise direction.

The widthwise end face 20b of the second zipper tape 20 may be arranged at a position overlapping at least a portion of the engaging head portion 31a of the chain element 31 in the widthwise direction, may be arranged on the same plane S2 as the widthwise end face 31f of the engaging head portion 31a (i.e., the widthwise end face of the second chain element row 60) in the widthwise direction, or may be arranged closer to the first zipper tape 10 than the engaging head portion 31a. In the example of FIG. 2 , the widthwise end face 20b of the second zipper tape 20 is arranged on the same plane S2 as the widthwise end face of the second chain element row 60 in the widthwise direction.

In this way, when the first chain tooth row 50 and the second chain tooth row 60 are separated, the end face 10b of the first zipper tape 10 in the width direction and the end face of the first chain tooth row 50 in the width direction are arranged on the same plane S1, and the end face 20b of the second zipper tape 20 in the width direction and the end face of the second chain tooth row 60 in the width direction are arranged on the same plane S2, so that when the first chain tooth row 50 and the second chain tooth row 60 are engaged as described later, the first zipper tape 10 and the second zipper tape 20 can be more reliably bent into an arc shape and closely contact each other. The reason for this is that the first and second zipper tapes 10 and 20 have the following configuration relationship: the first and second zipper tapes 10 and 20 have one end 10a and one end 20a in the width direction that do not hinder the engagement of the first and second zipper tapes 50 and 60, and the first and second zipper tapes 10 and 20 are not easily broken by the compression joint. In addition, the so-called "arranged on the same plane" does not necessarily mean that they are completely arranged on the same plane. Considering the taper of the engagement head 31a, it also includes the case where the first and second zipper tapes 10 and 20 have one end 10b and one end 20b in the width direction that are approximately on the same plane in a range that is consistent with the range from the starting point to the end point of the taper of the engagement head 31a.

By moving the slider 40 upward from the state where the first chain tooth row 50 and the second chain tooth row 60 are separated as shown in FIG. 3 , the first chain tooth row 50 and the second chain tooth row 60 are engaged as shown in FIG. 2 . At this time, one end 10a of the first zipper tape 10 in the width direction extends further toward the second zipper tape 20 (one end side in the width direction) than the position O1 which is the engagement center O of the first chain tooth row 50 and the second chain tooth row 60, and one end 20a of the second zipper tape 20 in the width direction extends further toward the first zipper tape 10 (one end side in the width direction) than the position O2 which is the engagement center O, so the one end 10a in the width direction and the one end 20a in the width direction are squeezed and deformed by each other in the width direction, and are bent into an arc shape convex to the surface and are in close contact with each other. 2, the seams 33 sewn to the first and second zipper tapes 10, 20 and on the width direction end portions 10a and 20a of the first and second zipper tapes 10, 20 are sometimes slightly stretched and floated as the first and second zipper tapes 10, 20 are bent.

Thus, when the first chain element row 50 and the second chain element row 60 are engaged with each other, the first zipper tape 10 and the second zipper tape 20 are in close contact with each other, so that a gap (so-called middle partition) is not formed between the first zipper tape 10 and the second zipper tape 20 as in the conventional reverse-mounted zipper. Therefore, when the user observes the zipper 1 from the front side, the first chain element row 50 and the second chain element row 60 cannot be seen, and the appearance is excellent. This zipper 1 is particularly suitable for articles such as car seats, bags, and furniture that attach importance to aesthetics.

Furthermore, since the first zipper tape 10 and the second zipper tape 20 are bent into an arc shape and closely contact each other, even when a force in directions away from each other (so-called lateral pulling) acts on the first zipper tape 10 and the second zipper tape 20, the closely contacted state can be maintained by only slightly reducing the degree of bending within a range where the engagement gaps between the chain elements 31 and the chain elements 31 are offset, thereby maintaining a good appearance of the zipper 1.

Furthermore, a waterproof agent may be attached to the first zipper tape 10 and the second zipper tape 20. By attaching the waterproof agent, waterproof performance can be imparted to the zipper 1. As the waterproof agent, for example, a fluorine-based compound, a silicone-based compound, an acrylic waterproof agent, a silicone composite waterproof agent, a wax-based compound, an ethylene urea-based compound, a zirconium-based compound, a fatty acid amide-based compound, a hydroxymethyl amide-based compound, an alkyl urea-based compound, a fatty acid amide-based compound, or the like can be used.

The process of attaching the waterproofing agent to the first zipper tape 10 and the second zipper tape 20 may be applied to any process. For example, the zipper tape 3 and the zipper tape 5 may be guided by winding along the circumference of a guide roller (not shown) and continuously passed through a container filled with the waterproofing agent to be immersed in the waterproofing agent. In the above process, the waterproofing agent is efficiently applied to the entire surface of the first zipper tape 10 and the second zipper tape 20, the first chain element row 50 and the second chain element row 60, the core thread 32, and the stitching thread 33 constituting the zipper tape 3 and the zipper tape 5. Next, the zipper tapes 3 and 5 are lifted from the container and continuously passed through a drying chamber, thereby first drying the waterproofing agent applied to the entire surface of the zipper tapes 3 and 5. After the waterproofing agent is dried, the zipper tapes 3 and 5 are further continuously passed through a heat treatment chamber, thereby heat-treating the dried waterproofing agent. In the heat treatment, all base materials of the first zipper tape 10 and the second zipper tape 20, the first chain element row 50 and the second chain element row 60, the core thread 32, and the sewing thread 33 are welded and attached to the waterproofing agent.

In this way, the zipper 1 can be used as a waterproof zipper when the first zipper tape 10 and the second zipper tape 20 are waterproofed. In particular, in this embodiment, since the first zipper tape 10 and the second zipper tape 20 are bent into an arc shape and closely contact each other when the first chain element row 50 and the second chain element row 60 are engaged with each other, no gap (middle partition) is formed between the first zipper tape 10 and the second zipper tape 20, and the intrusion of liquid from the middle partition as in the prior art can be suppressed.

2, when the first chain element row 50 and the second chain element row 60 are engaged with each other, the width direction end surface 10b and the width direction end surface 20b of the first zipper tape 10 and the second zipper tape 20 face the side (back side) of the chain element 31 and abut against the first chain element row 50 and the second chain element row 60. In addition, the surface 13 of the width direction end 10a of the first zipper tape 10 and the surface 23 of the width direction end 20a of the second zipper tape 20 are in close contact with each other at the engagement center O. In this way, the surfaces 13 and 23 of the one end portions 10a and 20a in the width direction of the first zipper tape 10 and the second zipper tape 20 are in close contact with each other. Therefore, compared with the case where the back surfaces 11 and 21 are in close contact with each other (the case where the one end portions 10a and 20a in the width direction are bent in the direction opposite to the present embodiment), the thickness of the zipper 1 can be suppressed and the sliding resistance of the slider 40 can be reduced. In addition, assuming that the back surfaces 11 and 21 are brought into close contact with each other, the width direction end surfaces 10b and 20b of the first zipper tape 10 and the second zipper tape 20 are facing the surface, and the width direction end surfaces 10a and 20a as the tape edges are convex toward the surface, thereby deteriorating the feel of the surface.

In addition, as shown in FIG. 2 , when the first chain tooth row 50 and the second chain tooth row 60 are engaged with each other, the back surface 11 and the back surface 21 of one end surface 10b in the width direction and one end surface 20b in the width direction of the first zipper tape 10 and the second zipper tape 20 are separated from the first chain tooth row 50 and the second chain tooth row 60 (chain tooth 31) in the front-back direction, and the first space T1 and the second space T2 are respectively divided between the two.

By providing the first space T1 and the second space T2 as described above, the first zipper tape 10 and the second zipper tape 20 can be easily buckled when the first chain element row 50 and the second chain element row 60 are combined by the slider 40. In addition, the larger the first space T1 and the second space T2, the larger the pressure-bonded area of the first zipper tape 10 and the second zipper tape 20 at the one end 10a in the width direction and the one end 20a in the width direction, the larger the pressure-bonded area of the first zipper tape 10 and the second zipper tape 20 at the one end 10a in the width direction and the one end 20a in the width direction, and the generation of the gap (middle partition) between the first zipper tape 10 and the second zipper tape 20 can be suppressed, thereby contributing to the improvement of the appearance or the improvement of the waterproofness and water resistance. Furthermore, the pressure-bonded first zipper tape 10 and the second zipper tape 20 are not easily broken, so that the shape is easily maintained.

In addition, as described above, since the first zipper tape 10 and the second zipper tape 20 are woven or knitted and have excellent flexibility, the close contact between the first zipper tape 10 and the second zipper tape 20 can be improved when the first chain element row 50 and the second chain element row 60 are engaged with each other. In addition, the buckled state of the first zipper tape 10 and the second zipper tape 20 can be maintained. Therefore, the generation of a gap (middle partition) between the first zipper tape 10 and the second zipper tape 20 can be suppressed, thereby contributing to the improvement of the appearance or the improvement of waterproofness and water resistance. In addition, if the first zipper tape 10 and the second zipper tape 20 are formed of resin or the like, it is difficult to form and maintain the buckled shape.

FIG4 is a cross-sectional view of the main part of the zipper of the modified example of the first embodiment, and is a view showing the state of the first chain element row and the second chain element row being engaged. In the example of FIG3, compared with the example of FIG2, the buckling degree of the one end 10a of the width direction of the first zipper tape 10 and the one end 20a of the width direction of the second zipper tape 20 is increased, and the compression area of the surface 13 of the one end 10a of the width direction of the first zipper tape 10 and the surface 23 of the one end 20a of the width direction of the second zipper tape 20 is increased. In this way, by appropriately adjusting the compression area, the requirements for waterproofness and water resistance can be met.

(Second embodiment) Fig. 5 is a cross-sectional view of the main part of the zipper of the second embodiment, and is a view showing the state of the first chain element row and the second chain element row being engaged. Fig. 6 is a cross-sectional view of the main part of the zipper of the second embodiment, and is a view showing the state of the first chain element row and the second chain element row being separated. The zipper 1 of the second embodiment is different from the first embodiment in that the first water stop film 70 and the second water stop film 80 are provided on the first zipper tape 10 and the second zipper tape 20. Since the other structures of the second embodiment are the same as those of the first embodiment, their description is omitted or simplified by marking the same symbols as those of the first embodiment in the diagram.

As shown in Fig. 5 and Fig. 6, the zipper 1 of the second embodiment further comprises: a first waterproof film 70 (first waterproof layer) provided on the surface 13 of the first zipper tape 10; and a second waterproof film 80 (second waterproof layer) provided on the surface 23 of the second zipper tape 20. Therefore, the zipper 1 of the present embodiment is a waterproof zipper having waterproof properties.

The left and right pair of first waterproof membranes 70 and second waterproof membranes 80 are respectively in the same strip shape as the first zipper tape 10 and the second zipper tape 20, and have a back surface 71, a back surface 81 (first waterproof main surface), and a surface 73, a surface 83 (second waterproof main surface) on the opposite side of the back surface 71 and the back surface 81. The first waterproof membrane 70 and the second waterproof membrane 80 are formed to cover the entire surface 13, the surface 23 of the first zipper tape 10 and the second zipper tape 20. In this embodiment, the first waterproof membrane 70 and the second waterproof membrane 80 have substantially the same upper and lower dimensions and width dimensions as the first zipper tape 10 and the second zipper tape 20.

The first waterproof film 70 and the second waterproof film 80 are formed by bonding or welding a waterproof layer such as a thermosetting polyurethane film to the surfaces 13 and 23 of the first zipper tape 10 and the second zipper tape 20 to which the first chain element row 50 and the second chain element row 60 are sewn. Here, the zipper 1 is in a state where the common waterproof layer (the first waterproof film 70 and the second waterproof film 80) is integrally bonded to the first zipper tape 10 and the second zipper tape 20.

Thereafter, a waterproofing agent is attached to the zipper 1 by the same method as that described in the first embodiment. For example, the zipper tape 3 and the zipper tape 5 may be guided by being wound along the circumference of a guide roller (not shown) and continuously passed through a container filled with the waterproofing agent to be immersed in the waterproofing agent. In the above treatment, waterproofing is efficiently imparted to the entire surface of the first zipper tape 10 and the second zipper tape 20, the first chain element row 50 and the second chain element row 60, the core thread 32, the sewing thread 33, and the waterproof layer (the first waterproof film 70 and the second waterproof film 80) constituting the zipper tape 3 and the zipper tape 5. Next, the zipper tapes 3 and 5 are lifted from the container and continuously passed through a drying chamber, thereby first drying the waterproofing agent applied to the entire surface of the zipper tapes 3 and 5. After the waterproofing agent is dried, the zipper tapes 3 and 5 are further continuously passed through a heat treatment chamber, thereby heat-treating the dried waterproofing agent. In the heat treatment, the first zipper tape 10 and the second zipper tape 20, the first chain element row 50 and the second chain element row 60, the core thread 32, the seam thread 33, and the waterproofing layer (the first waterproofing film 70 and the second waterproofing film 80) are welded and attached to the waterproofing agent.

Next, the zipper 1 after the heat treatment is taken out, and a cutting device such as a cutter is used to cut the single waterproof layer (first waterproof film 70 and second waterproof film 80) connecting the left and right zipper tooth tapes 3 and 5 to each other in the longitudinal direction along the engaging portion where the first and second zipper tooth rows 50 and 60 engage with each other, and divide it into two parts on the left and right. In this way, a pair of left and right first waterproof films 70 and second waterproof films 80 are formed.

As shown in Figure 6, when the first chain tooth row 50 and the second chain tooth row 60 are separated, the width direction end 10a and the width direction end 70a of the first zipper tape 10 and the first water stop film 70 and the width direction end 20a and the width direction end 80a of the second zipper tape 20 and the second water stop film 80 are separated from each other in the width direction.

As shown in Figure 6, when the first chain tooth row 50 and the second chain tooth row 60 are separated, the end 10a in the width direction and the end 70a in the width direction of the first zipper tape 10 and the first water stop membrane 70 extend further toward the side of the second zipper tape 20 (one end side in the width direction) than the position O1 which is the engagement center O of the first chain tooth row 50 and the second chain tooth row 60, and the end 20a in the width direction and the end 80a in the width direction of the second zipper tape 20 and the second water stop membrane 80 extend further toward the side of the first zipper tape 10 (one end side in the width direction) than the position O2 which is the engagement center O. That is, it is designed that when the first chain tooth row 50 and the second chain tooth row 60 are engaged as shown in FIG4 , the first zipper tape 10 and the second zipper tape 20 overlap with the engagement center O, and the first water stop film 70 and the second water stop film 80 overlap with the engagement center O. By arranging the first zipper tape 10 and the second zipper tape 20, the first water stop film 70 and the second water stop film 80, and the first chain tooth row 50 and the second chain tooth row 60 as described above, when the first chain tooth row 50 and the second chain tooth row 60 are engaged as described later, the first zipper tape 10 and the second zipper tape 20 and the first water stop film 70 and the second water stop film 80 can be bent into an arc shape and closely contact each other.

More specifically, when the first chain tooth row 50 and the second chain tooth row 60 are separated, the first zipper tape 10 and the first water stop membrane 70 have one end face 10b in the width direction and one end face 70b in the width direction arranged on the side closer to the second zipper tape 20 than the position O1 which is the engagement center O (one end side in the width direction), and the second zipper tape 20 and the second water stop membrane 80 have one end face 20b in the width direction and one end face 80b in the width direction arranged on the side closer to the first zipper tape 10 than the position O2 which is the engagement center O (one end side in the width direction).

The first zipper tape 10 and the first waterproof film 70 may be arranged at a position overlapping at least a portion of the engaging head 31a of the chain element 31 in the width direction, or may be arranged on the same plane S1 as the first end face 31e of the engaging head 31a (i.e., the first end face of the first chain element row 50 in the width direction), or may be arranged closer to the second zipper tape 20 than the engaging head 31a. In the example of FIG. 6 , the first zipper tape 10 and the first waterproof film 70 may be arranged on the same plane S1 as the first end face of the first chain element row 50 in the width direction.

The width direction end face 20b and the width direction end face 80b of the second zipper tape 20 and the second waterproof film 80 may be arranged at a position overlapping with at least a portion of the engaging head portion 31a of the chain element 31 in the width direction, or may be arranged on the same plane S2 as the width direction end face 31f of the engaging head portion 31a (i.e., the width direction end face of the second chain element row 60) in the width direction, or may be arranged closer to the first zipper tape 10 than the engaging head portion 31a. In the example of FIG. 6 , the width direction end face 20b of the second zipper tape 20 is arranged on the same plane S2 as the width direction end face of the second chain element row 60 in the width direction.

In this way, the first zipper tape 10 and the first water-stop membrane 70 have an end face 10b in the width direction, an end face 70b in the width direction, and an end face of the first chain tooth row 50 in the width direction are arranged on the same plane S1, and the second zipper tape 20 and the second water-stop membrane 80 have an end face 20b in the width direction, an end face 80b in the width direction, and an end face of the second chain tooth row 60 in the width direction are arranged on the same plane S2. Therefore, when the first chain tooth row 50 and the second chain tooth row 60 are engaged, the first zipper tape 10 and the second zipper tape 20 as well as the first water-stop membrane 70 and the second water-stop membrane 80 can be more reliably bent into an arc shape and closely contact each other. The reason for this is that the configuration relationship is as follows: the first zipper tape 10 and the second zipper tape 20 have one end 10a in the width direction and one end 20a in the width direction that do not hinder the engagement of the first chain element row 50 and the second chain element row 60, and the compression joint between the first zipper tape 10 and the second zipper tape 20 is not easily broken. In addition, the so-called "arranged on the same plane" does not necessarily need to be arranged completely on the same plane. Considering the taper of the engagement head 31a, it also includes the case where the one end face in the width direction of the zipper tape is on approximately the same plane in a range that is consistent with the range from the start point of the taper of the engagement head 31a to the end point of the taper.

By moving the slider 40 upward from the state where the first chain tooth row 50 and the second chain tooth row 60 are separated as shown in FIG. 6 , the left and right pair of first chain tooth rows 50 and the second chain tooth row 60 are engaged as shown in FIG. 5 . At this time, one end 10a and one end 70a in the width direction of the first zipper tape 10 and the first water stop membrane 70 extend further toward the second zipper tape 20 side (one end in the width direction) than the position O1 which is the engagement center O of the first chain tooth row 50 and the second chain tooth row 60, and one end 20a and one end 80a in the width direction of the second zipper tape 20 and the second water stop membrane 80 extend further toward the first zipper tape 10 side (one end in the width direction) than the position O2 which is the engagement center O, so the one end 10a and one end 70a in the width direction and the one end 20a and one end 80a in the width direction are squeezed and deformed by each other in the width direction, and are bent into an arc shape protruding toward the surface and are in close contact with each other. 2, the seams 33 sewn to the first and second zipper tapes 10, 20 and on the width direction end portions 10a and 20a of the first and second zipper tapes 10, 20 are sometimes slightly stretched and floated as the first and second zipper tapes 10, 20 are bent.

Thus, when the first chain element row 50 and the second chain element row 60 are engaged with each other, the first zipper tape 10 and the second zipper tape 20 and the first water stop film 70 and the second water stop film 80 are in close contact with each other, so that no gap (so-called middle partition) is formed between the first zipper tape 10 and the second zipper tape 20 and the first water stop film 70 and the second water stop film 80 as in the existing reverse-mounted zipper. Therefore, when the user observes the zipper 1 from the front side, the first chain element row 50 and the second chain element row 60 cannot be seen, and the appearance is excellent. This zipper 1 is particularly suitable for items such as car seats, bags, and furniture that attach importance to beauty.

Furthermore, since the first zipper tape 10 and the second zipper tape 20 as well as the first water-stopping film 70 and the second water-stopping film 80 are bent into an arc shape and closely contact each other, even when a force in directions away from each other (so-called lateral pulling) acts on the first zipper tape 10 and the second zipper tape 20, the closely contacting state can be maintained by only slightly reducing the degree of bending within a range where the engagement gaps between the chain elements 31 and the chain elements 31 are offset, thereby maintaining a good appearance of the zipper 1.

When the first chain tooth row 50 and the second chain tooth row 60 are engaged with each other, the first zipper tape and the second zipper tape as well as the first water-stop film 70 and the second water-stop film 80 are bent into an arc shape and are in close contact with each other, so that no gap (middle partition) is formed between the first zipper tape 10 and the second zipper tape 20 and the first water-stop film 70 and the second water-stop film 80, thereby preventing liquid from entering from the middle partition as in the prior art.

In addition, as shown in FIG. 5, when the first chain element row 50 and the second chain element row 60 are engaged with each other, the width direction end face 10b and the width direction end face 20b of the first zipper tape 10 and the second zipper tape 20 and the width direction end face 70b and the width direction end face 80b of the first waterproof film 70 and the second waterproof film 80 face toward the side (back side) of the chain element 31. The width direction end face 70b and the width direction end face 80b of the first waterproof film 70 and the second waterproof film 80 sometimes abut against the first chain element row 50 and the second chain element row 60. In addition, the surface 73 of the width direction end 70a of the first waterproof film 70 and the surface 83 of the width direction end 80a of the second waterproof film 80 are in close contact with each other at the engagement center O. Therefore, the liquid intrusion suppression effect can be enhanced.

Fig. 7 is a cross-sectional view of the main part of the zipper of the modified example of the second embodiment, and is a view showing the state of the first chain tooth row and the second chain tooth row being engaged. In the example of Fig. 7, compared with the example of Fig. 5, the buckling degree of the first zipper tape 10 and the first waterproof membrane 70 at one end 10a in the width direction, the first end 70a in the width direction, and the second zipper tape 20 and the second waterproof membrane 80 at one end 20a in the width direction, and the one end 80a in the width direction are increased, and the compression area of the surface 73 of the one end 70a in the width direction of the first waterproof membrane 70 and the surface 83 of the one end 80a in the width direction of the second waterproof membrane 80 is increased. In this way, by appropriately adjusting the compression area, the requirements of water stopping and water resistance can be met.

In addition, the present invention is not limited to the contents illustrated in the above-mentioned embodiments, and can be appropriately modified within the scope not departing from the gist of the present invention.

As described above, the following matters are disclosed in this specification.

[1] A zipper (1) comprises: a pair of first and second zipper tapes (10, 20) which are in the shape of elongated strips and respectively have a first main surface (11, 21) and a second main surface (13, 23) on the opposite side of the first main surface (11, 21); a first chain tooth row (50) disposed on the first main surface (11) at one end (10a) in the width direction of the first zipper tape (10); and a second chain tooth row (60) disposed on the first main surface (21) at one end (20a) in the width direction of the second zipper tape (20), and in the zipper (1), When the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, one end portion (10a) of the first zipper tape (10) in the width direction and one end portion (20a) of the second zipper tape (20) in the width direction are respectively bent into an arc shape and are closely connected to each other.

According to the structure, when the first chain element row and the second chain element row (50, 60) are engaged with each other, the first zipper tape and the second zipper tape (10, 20) are in close contact with each other, so that no gap (so-called middle partition) is formed between the first zipper tape and the second zipper tape (10, 20) as in the conventional reverse-mounted zipper. Therefore, when the user observes the zipper (1) from the front side, the first chain element row and the second chain element row (50, 60) cannot be seen, and the appearance is excellent. This zipper (1) is particularly suitable for articles such as car seats, bags, and furniture that attach importance to aesthetics. Furthermore, since the first zipper tape and the second zipper tape (10, 20) are bent into an arc shape and closely contact each other, even when a force in directions away from each other (so-called lateral pulling) acts on the first zipper tape and the second zipper tape (10, 20), within the range where the gaps between the chain teeth (31, 31) are offset, the closely contacted state can be maintained by only slightly reducing the degree of bending, thereby maintaining a good appearance of the zipper (1).

[2] The zipper (1) according to [1] is characterized in that, when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the second main surface (13) of one end (10a) in the width direction of the first zipper tape (10) and the second main surface (23) of one end (20a) in the width direction of the second zipper tape (20) are in close contact with each other.

According to the structure, since the second main surfaces (13, 23) of one end portion (10a, 20a) in the width direction of the first zipper tape and the second zipper tape (10, 20) are in close contact with each other, the thickness of the zipper (1) can be suppressed and the sliding resistance of the slider (40) can be reduced compared to the case where the first main surfaces (11, 21) are in close contact with each other.

[3] The zipper (1) according to [1] or [2] is characterized in that, when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, a first space (T1) is formed between the first main surface (11) of one end portion (10a) in the width direction of the first zipper tape (10) and the first chain tooth row (50), and a second space (T2) is formed between the first main surface (21) of one end portion (20a) in the width direction of the second zipper tape (20) and the second chain tooth row (60).

According to the structure, by providing the first space and the second space (T1, T2), when the first chain tooth row and the second chain tooth row (50, 60) are combined using the slider (40), the first zipper tape and the second zipper tape (10, 20) can be easily buckled. In addition, the larger the first space and the second space (T1, T2), the larger the compression contact area between the first end face (10b) in the width direction and the first main surface (11, 21) of the first end face (20b) in the width direction of the first zipper tape and the second zipper tape (10, 20), and the more the generation of the gap (middle partition) between the first zipper tape and the second zipper tape (10, 20) can be suppressed, thereby contributing to the improvement of the appearance or the improvement of the water stopping property and water resistance. Furthermore, the compression joint between the first zipper tape and the second zipper tape (10, 20) is not easily broken, so that the shapes are easily maintained.

[4] The zipper (1) according to [1] or [2] is characterized in that the first zipper tape and the second zipper tape (10, 20) are woven or knitted.

According to the structure, since the first zipper tape and the second zipper tape (10, 20) are woven or knitted and have excellent flexibility, when the first chain element row and the second chain element row (50, 60) are engaged with each other, the close contact between the first zipper tape and the second zipper tape (10, 20) can be improved. In addition, the buckling state of the first zipper tape and the second zipper tape (10, 20) can be maintained. Therefore, the generation of a gap (middle partition) between the first zipper tape and the second zipper tape (10, 20) can be suppressed, thereby contributing to the improvement of appearance or the improvement of water-stopping and water-resistant properties.

[5] The zipper (1) according to [1] or [2] is characterized in that: an end portion (10a) in the width direction of the first zipper tape (10) extends further to the second zipper tape (20) side than the engagement center (O) of the first chain tooth row and the second chain tooth row (50, 60), and an end portion (20a) in the width direction of the second zipper tape (20) extends further to the first zipper tape (10) side than the engagement center (O), so that when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, an end portion (10a) in the width direction of the first zipper tape (10) and an end portion (20a) in the width direction of the second zipper tape (20) are bent into an arc shape and closely contact each other.

According to the structure, through the arrangement relationship between the first chain tooth row and the second chain tooth row (50, 60) and the first zipper tape and the second zipper tape (10, 20), when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the first zipper tape and the second zipper tape (10, 20) can be bent into an arc shape and closely contact each other.

[6] The zipper (1) according to [5] is characterized in that: an end face (10b) in the width direction of the first zipper tape (10) and an end face (31e) in the width direction of the first chain tooth row (50) are arranged on the same plane (S1), and an end face (20b) in the width direction of the second zipper tape (20) and an end face (31f) in the width direction of the second chain tooth row (60) are arranged on the same plane (S2), so that when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, an end face (10a) in the width direction of the first zipper tape (10) and an end face (20a) in the width direction of the second zipper tape (20) are bent into an arc shape and are closely connected to each other.

According to the structure, the first zipper tape and the second zipper tape (10, 20) can be bent into an arc shape more reliably and closely connected to each other. The reason is that due to the following configuration relationship: the first zipper tape and the second zipper tape (10, 20) have one end (10a, 20a) in the width direction and do not hinder the first chain tooth row and the second chain tooth row (50, 60) from interlocking with each other, and the first zipper tape and the second zipper tape (10, 20) are not easily broken when pressed together.

[7] The zipper (1) according to [1] or [2] is characterized in that it comprises: a first water stop layer (70) disposed on the second main surface (13) of the first zipper tape (10); and a second water stop layer (80) disposed on the second main surface (23) of the second zipper tape (20).

According to the above structure, the zipper (1) can be provided with water-proof properties.

[8] The zipper (1) according to [7] is characterized in that, when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, one end (70a) of the first water stop layer (70) in the width direction and one end (80a) of the second water stop layer (80) in the width direction are bent into an arc shape and closely contact each other.

According to the structure, when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the first zipper tape and the second zipper tape (10, 20) and the first water stop film and the second water stop film (70, 80) are in close contact with each other, so that no gap (so-called middle partition) is formed between the first zipper tape and the second zipper tape (10, 20) and the first water stop film and the second water stop film (70, 80) as in the existing reverse zipper (100). Therefore, when the user observes the zipper (1) from the front side, the first chain tooth row and the second chain tooth row (50, 60) cannot be seen, and the appearance is excellent. This zipper (1) is particularly suitable for items such as car seats, bags, furniture, etc. that attach importance to aesthetics.

[9] The zipper (1) according to [8] is characterized in that: the first water stop layer and the second water stop layer (70, 80) respectively include: a first water stop main surface (71, 81) connected to the second main surface (13, 23) of the first zipper tape and the second zipper tape (10, 20); and a second water stop main surface (73, 83) which is the opposite side of the first water stop main surface (71, 81); when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the second water stop main surface (73) of one end (70a) in the width direction of the first water stop layer (70) and the second water stop main surface (83) of one end (80a) in the width direction of the second water stop layer (80) are in close contact with each other.

According to the above structure, the liquid intrusion suppression effect can be improved.

1: zipper 3, 5, 102: zipper teeth 10: first zipper tape 10a, 20a, 70a, 80a: one end in the width direction 10b, 20b, 31e, 31f, 70b, 80b: one end in the width direction 11, 21: back surface (first main surface) 13, 23: surface (second main surface) 20: second zipper tape 31: chain teeth 31a: engaging head 31b: first leg 31c: second leg 31d: connecting part 32: core thread 33: sewing thread 40, 101: slider 41: main body 42: pull tab mounting part 43, 120: pull tab 50: First chain teeth 60: Second chain teeth 70: First waterproof membrane (first waterproof layer) 71, 81: Back (first waterproof main surface) 73, 83: Surface (second waterproof main surface) 80: Second waterproof membrane (second waterproof layer) 100: Reverse zipper 103: Chain teeth 104: Zipper tape 105: Seam line 106: Core line 110: Slider body 111: Upper wing plate 112: Lower wing plate 114: Pull tab mounting column 115: Flange O: Engagement center O1, O2: Position S: Gap S1, S2: Plane T1: First space T2: Second space

FIG. 1 is a surface view of the first embodiment of the zipper of the present invention. FIG. 2 is a cross-sectional view of the main part of the zipper shown in FIG. 1, and is a view showing a state where the first chain element row and the second chain element row are engaged. FIG. 3 is a cross-sectional view of the main part of the zipper shown in FIG. 1, and is a view showing a state where the first chain element row and the second chain element row are separated. FIG. 4 is a cross-sectional view of the main part of the zipper of a modified example of the first embodiment, and is a view showing a state where the first chain element row and the second chain element row are engaged. FIG. 5 is a cross-sectional view of the main part of the zipper of the second embodiment, and is a view showing a state where the first chain element row and the second chain element row are engaged. FIG6 is a cross-sectional view of the main part of the zipper of the second embodiment, and is a view showing a state where the first chain element row and the second chain element row are separated. FIG7 is a cross-sectional view of the main part of the zipper of a modified example of the second embodiment, and is a view showing a state where the first chain element row and the second chain element row are engaged. FIG8 is a cross-sectional view showing the reverse-mounted zipper of Patent Document 1.

1: Zipper

3, 5: Zipper chain strap

10: First zipper strap

10a, 20a: one end in width direction

10b, 20b: one end face in width direction

11, 21: Back side (first main surface)

13, 23: Surface (second main surface)

20: Second zipper strap

31: Chain teeth

31a: Close the head

31b: First foot

31c: Second leg

31d: Connection part

32: Core wire

33: Seam

50: First chain of dentition

60: Second chain of dentition

O: Integration Center

T1: First Space

T2: Second Space

Claims (9)

A zipper (1) is characterized in that it comprises: a pair of first and second zipper tapes (10, 20) in the shape of elongated strips and respectively having a first main surface (11, 21) and a second main surface (13, 23) on the opposite side of the first main surface (11, 21); a first chain tooth row (50) arranged on the first main surface (11) at one end (10a) in the width direction of the first zipper tape (10); and a second chain tooth row ( 60), arranged on the first main surface (21) of one end (20a) in the width direction of the second zipper tape (20), and in the zipper (1), when the first chain tooth row and the second chain tooth row (50, 60) are mutually engaged, the one end (10a) in the width direction of the first zipper tape (10) and the one end (20a) in the width direction of the second zipper tape (20) are respectively bent into an arc shape and closely contact each other. The zipper (1) as claimed in claim 1, wherein when the first chain element row and the second chain element row (50, 60) are engaged with each other, the second main surface (13) of the one end (10a) in the width direction of the first zipper tape (10) and the second main surface (23) of the one end (20a) in the width direction of the second zipper tape (20) are in close contact with each other. The zipper (1) as described in claim 1 or claim 2, wherein when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, a first space (T1) is formed between the first main surface (11) of the one end (10a) in the width direction of the first zipper tape (10) and the first chain tooth row (50), and a second space (T2) is formed between the first main surface (21) of the one end (20a) in the width direction of the second zipper tape (20) and the second chain tooth row (60). The zipper (1) as described in claim 1 or claim 2, wherein the first zipper tape and the second zipper tape (10, 20) are woven or knitted. The zipper (1) as claimed in claim 1 or claim 2, wherein the one end (10a) in the width direction of the first zipper tape (10) extends further toward the second zipper tape (20) than the engagement center (O) of the first chain tooth row and the second chain tooth row (50, 60), and the one end (20a) in the width direction of the second zipper tape (20) extends further toward the first zipper tape (10) than the engagement center (O), so that when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the one end (10a) in the width direction of the first zipper tape (10) and the one end (20a) in the width direction of the second zipper tape (20) are bent into an arc shape and are in close contact with each other. The zipper (1) as described in claim 5, wherein an end face (10b) in the width direction of the first zipper tape (10) and an end face (31e) in the width direction of the first chain tooth row (50) are arranged on the same plane (S1), and an end face (20b) in the width direction of the second zipper tape (20) and an end face (31f) in the width direction of the second chain tooth row (60) are arranged on the same plane (S2), so that when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the end face (10a) in the width direction of the first zipper tape (10) and the end face (20a) in the width direction of the second zipper tape (20) are bent into an arc shape and are in close contact with each other. The zipper (1) as described in claim 1 or claim 2, wherein the first water stop layer (70) is provided on the second main surface (13) of the first zipper tape (10); and the second water stop layer (80) is provided on the second main surface (23) of the second zipper tape (20). The zipper (1) as described in claim 7, wherein when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, one end (70a) of the first water stop layer (70) in the width direction and one end (80a) of the second water stop layer (80) in the width direction are bent into an arc shape and closely contact each other. The zipper (1) as claimed in claim 8, wherein the first water stop layer and the second water stop layer (70, 80) respectively include: a first water stop main surface (71, 81) connected to the second main surface (13, 23) of the first zipper tape and the second zipper tape (10, 20); and a second water stop main surface (73, 83) located on the opposite side of the first water stop main surface (71, 81), when the first chain tooth row and the second chain tooth row (50, 60) are engaged with each other, the second water stop main surface (73) of the first water stop layer (70) at one end (70a) in the width direction and the second water stop main surface (83) of the second water stop layer (80) at one end (80a) in the width direction are in close contact with each other.