JP5822612B2 - Composite zipper and zipper bag - Google Patents

Description

  The present invention relates to a composite zipper and a zipper bag, and more particularly to a composite zipper and a zipper bag that suppress the occurrence of breakage while maintaining hermeticity.

  As a bag body suitably used for storage of food or the like, there is a zipper bag in which a zipper is provided at an opening portion of a bag formed of a synthetic resin so that the opening can be opened and closed repeatedly. When food is stored in a zipper bag, there is a demand for ensuring sealing. The zipper bag has an opposite profile of at least one of two opposed rib profiles and groove profiles that can be engaged in the longitudinal direction of the zipper where the opening cannot be closed if the zipper is misengaged. The longitudinally extending portions that can engage and engage the material are structurally discontinuous along their length and are not substantially combined with the opposing zipper profiles when the two profiles are engaged therewith, but with each other By adopting the zipper that is in contact, there is a zipper bag that can confirm that the zipper has closed with both sound and feel as having vibration or shaking feeling when closing the zipper (for example, patent Reference 1).

JP-A-8-58811

  The above-mentioned zipper bag can be confirmed by both sound and feel that the zipper is closed, so that it is possible to avoid the situation that the zipper has been closed but is not actually closed. May be inferior in sealing performance. In order to ensure the sealing property, it is conceivable to provide a zipper having a high sealing property in parallel with the zipper having a discontinuous structure. However, a zipper with high hermeticity is often configured so that the opposing profiles are strengthened so that they do not easily open. If you try to open both ends of the zipper bag, In some cases, the bag around the zipper was damaged.

  An object of this invention is to provide the composite zipper which can suppress generation | occurrence | production of damage, maintaining a sealing property, and a zipper bag provided with the same in view of the above-mentioned subject.

  In order to achieve the above object, the composite zipper according to the first aspect of the present invention is formed of a synthetic resin, for example, as shown in FIGS. An auxiliary zipper 19 formed of synthetic resin and provided along the sealing zipper 18 at a predetermined distance D with respect to the zipper 18; the sealing zipper 18 is sealed perpendicular to the direction E in which the sealing zipper 18 extends A convex rail 20 that appears as a protrusion 21 in the zipper orthogonal cross section (see, for example, FIG. 2A), and a concave rail that appears as a groove forming member 31 in which a groove 30g surrounding the tip 22 of the protrusion 21 is formed in the sealed zipper orthogonal cross section. The concave rail 30 is bent so that the tips adjacent to the opening 31h of the groove forming member 31 in the cross section of the sealed zipper are close to each other. The convex rail 20 is formed to be narrowed suddenly after the width gradually increases in the middle direction from the tip 22t of the projection 21 in the cross section of the sealed zipper, and the concave rail 30 is formed. A jaw part 22j that engages with the claw part 31c is formed when the claw part 31c and the jaw part 22j are engaged with each other. The engaging force between the claw part 31c and the jaw part 22j is , The side adjacent to the auxiliary zipper 19 is formed smaller than the side opposite to the auxiliary zipper 19.

  If comprised in this way, since the force required when a sealing zipper opens from the side adjacent to an auxiliary | assistant zipper becomes comparatively small, damage can be suppressed, and the force required when opening from the other side of an auxiliary | assistant zipper is comparatively Since it becomes large, the sealing property is maintained. Furthermore, since the auxiliary zipper is provided along the sealing zipper, it is possible to prevent unintentional application of a force for opening the sealing zipper from the side adjacent to the auxiliary zipper.

  Further, the composite zipper according to the second aspect of the present invention is, for example, as shown in FIG. 2, in the composite zipper according to the first aspect of the present invention, the auxiliary zipper 19 extends in the direction E in which the auxiliary zipper 19 extends. A projecting rail 40 formed with a projecting portion 41 projecting in an orthogonal auxiliary zipper orthogonal section, and a sandwiching rail 50 formed with a sandwiching section 51 sandwiching the projecting portion 41 in an auxiliary zipper orthogonal section; A recess 41d is intermittently formed in at least one of the holding rails 50 in the direction E in which the auxiliary zipper 19 extends.

  If comprised in this way, an auxiliary | assistant zipper has the function which can detect the touch which closed the composite zipper with the finger | toe simultaneously while preventing the damage of a sealing zipper and assisting sealing.

  Further, the composite zipper according to the third aspect of the present invention is, for example, as shown in FIG. 2, in the composite zipper according to the second aspect of the present invention, the protruding rail 40 is a sealed zipper in the auxiliary zipper orthogonal cross section. 18 and an outer protrusion 43 far from the sealed zipper 18; when the holding rail 50 closes the auxiliary zipper 19, the auxiliary protrusion zipper 19 crosses the inner protrusion 42 in the cross section of the auxiliary zipper. On the other hand, an inner attachment portion 52 that comes into contact with the outer side of the sealed zipper 18 and an outer attachment portion 53 that comes into contact with the outer protrusion 43 from a side far from the sealed zipper 18 are configured.

  If comprised in this way, the fitting of a composite zipper can be stabilized and a fitting mistake can be suppressed.

  Further, the composite zipper according to the fourth aspect of the present invention is the composite zipper according to the third aspect of the present invention described above, for example, as shown in FIG. Diffusing portions 42j and 43j are formed in which the distal ends of 43 are bent away from each other; the sandwiching rail 50 is bent in the direction in which the distal ends of the inner and outer appendages 52 and 53 approach each other, thereby diffusing portions 42j and 43j. Proximity portions 52c and 53c that are engaged with each other are formed; the engagement force between the inner protrusion 42 and the inner attachment portion 52 is greater than the engagement force between the outer protrusion 43 and the outer attachment portion 53.

  If comprised in this way, it can suppress that an auxiliary | assistant zipper opens from the sealing zipper side, and can improve sealing performance.

  In addition, the zipper bag according to the fifth aspect of the present invention includes, for example, as shown in FIG. 1, a bag body 11 having an opening 10h into which an object can be taken in and out; and the first to fourth aspects of the present invention described above. The composite zipper 15 according to any one of the above aspects is provided; an auxiliary zipper 19 is provided on the opening 10 h side of the bag body 11 with respect to the sealed zipper 18.

  If comprised in this way, it will become a zipper bag with which airtightness is maintained, suppressing the damage around a composite zipper.

  According to the present invention, since the force required when the sealed zipper is opened from the side adjacent to the auxiliary zipper is relatively small, damage can be suppressed, and the force required when opening from the opposite side of the auxiliary zipper is relatively low. Since it becomes large, hermeticity is maintained, and furthermore, since the auxiliary zipper is provided along the hermetic zipper, it is possible to prevent unintentional application of force to open the hermetic zipper from the side adjacent to the auxiliary zipper.

It is a perspective view of the zipper bag concerning an embodiment of the invention. (A) is a fragmentary sectional view of the zipper bag which concerns on embodiment of this invention, (B) is a fragmentary top view of the convex rail and protrusion rail which comprise the composite zipper which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, with reference to FIG.1 and FIG.2, the composite zipper 15 and the zipper bag 10 which concern on embodiment of this invention are demonstrated. FIG. 1 is a perspective view of the zipper bag 10. 2A is a partial cross-sectional view of the zipper bag 10 and FIG. 2B is a partial plan view of the convex rail 20 and the protruding rail 40 constituting the composite zipper 15. The zipper bag 10 includes a bag body 11 and a composite zipper 15.

  The bag body 11 is formed in a bag shape by folding one rectangular sheet formed of a synthetic resin at the center in the longitudinal direction and welding the two opposing sides 10s orthogonal to the folded side 10t of the opposite sheet. Is formed. One of the folded sheets is the bag surface 12 (one surface), and the remaining one is the bag back surface 13 (the other surface). As the synthetic resin forming the bag body 11, a thermoplastic resin molded body such as a polyethylene resin, a polypropylene resin, and a polyamide resin can be used. By using these, airtightness can be provided. The bag body 11 has an opening 10h on the side opposite to the folded side 10t. The bag body 11 is provided with a composite zipper 15 in the vicinity of the opening 10h so as to cross the opening 10h, in other words, around the opening 10h.

  The composite zipper 15 does not have a slider and is a line fastener that can be attached and detached by a human hand. The composite zipper 15 includes a sealed zipper 18 and a click zipper 19 as an auxiliary zipper. The sealed zipper 18 and the click zipper 19 are provided on the bag body 11 so as to extend in parallel, and the sealed zipper 18 is disposed on the folded side 10t side and the click zipper 19 is disposed on the opening 10h side. Both the sealing zipper 18 and the click zipper 19 are made of flexible synthetic resin. The hermetic zipper 18 has a convex rail 20 and a concave rail 30. The click zipper 19 has a protruding rail 40 and a holding rail 50. The convex rail 20 and the protruding rail 40 are attached to the bag surface 12. The concave rail 30 and the sandwiching rail 50 are attached to the bag back surface 13. In the present embodiment, the convex rail 20 and the protruding rail 40 are made of a translucent material and are colored in blue, and the concave rail 30 and the sandwiching rail 50 are colored in yellow.

  The partial cross-sectional view of FIG. 2A shows a cross section orthogonal to the direction in which the sealed zipper 18 extends, that is, a sealed zipper orthogonal cross section. In this embodiment, the click zipper 19 extends in parallel with the sealed zipper 18, so the direction in which the click zipper 19 extends is the same as the direction in which the sealed zipper 18 extends. Zipper cross section). Hereinafter, the direction in which the sealed zipper 18 extends and the direction in which the click zipper 19 extends are simply referred to as a zipper extending direction E, and the sealed zipper orthogonal section and the click zipper orthogonal section are simply referred to as a zipper orthogonal section. In the following description of the zipper cross section, for the sake of convenience, the bag surface 12 side in the height H direction when the bag surface 12 and the bag back surface 13 are vertically arranged is down (or down), and the bag back surface 13 side is up. It is referred to as (or upward), and the folded side 10t (see FIG. 1) side in the width W direction is the inside (inside side) and the opening 10h side (end side) is the outside.

  First, the structure of the sealing zipper 18 in a zipper orthogonal cross section is demonstrated. In the zipper cross section, the convex rail 20 has an umbrella portion 22 as a tip portion and a handle portion 23 and appears as a protrusion 21 having a mushroom-like contour. The handle portion 23 extends vertically with substantially the same width, and one end is fixed to the bag surface 12. The umbrella part 22 is connected to the upper end of the handle part 23. The umbrella portion 22 gradually expands downward from the upper end 22t, and the lower surface is formed with a slight upward slope toward the handle portion 23. A jaw portion 22j is formed in a portion of the bottom portion of the umbrella portion 22 until it is connected to the handle portion 23. In the jaw portion 22j, the jaw portion 22jA on the outer side (click zipper 19 side) is formed to have a smaller overhang than the jaw portion 22jB on the inner side (the side opposite to the click zipper 19). In the present embodiment, the height of the protrusion 21 is approximately 0.1 to 0.5 mm, and the height of the umbrella portion 22 is approximately half the height of the protrusion 21.

  The concave rail 30 appears as a U-shaped member 31 as a groove forming member in which a groove 30g is formed in a zipper orthogonal cross section. The groove 30g is formed so as to receive the umbrella portion 22 of the protrusion 21 of the convex rail 20. In FIG. 2A, the U-shaped member 31 is provided with a U-shaped groove-like member arranged upside down, so that a U-shaped opening 31h for receiving the protrusion 21 is formed at the lower end. The U-shaped member 31 has an end facing the U-shaped opening 31 h fixed to the bag back surface 13. The lower end of the U-shaped member 31 located on both sides of the U-shaped opening 31h is bent so as to approach each other, thereby forming a claw portion 31c. The U-shaped member 31 is formed of a material having an elastic modulus that elastically deforms when the projection 21 is taken in and out with a predetermined force with respect to the groove 30g. The claw portion 31c is configured to engage with the jaw portion 22j when the umbrella portion 22 of the protrusion 21 is received in the groove 30g. In this Embodiment, the nail | claw part 31c of both ends is formed in the same magnitude | size (length). The height of the U-shaped member 31 is approximately the same as the height of the protrusion 21.

  Next, the structure of the click zipper 19 in a zipper orthogonal cross section is demonstrated. The click zipper 19 is provided outside the sealed zipper 18 at a predetermined interval. The distance D between the sealed zipper 18 and the click zipper 19 corresponding to a predetermined interval is determined from the viewpoint of productivity, and when the composite zipper 15 is closed, the sealed zipper 18 and the click zipper 19 are simultaneously closed with the thumb and the index finger. From the viewpoint of making it possible, the thickness is preferably 3 to 10 mm, more preferably 4 to 8 mm. In this embodiment, the thickness is 6 mm.

  The protruding rail 40 is formed with a protruding portion 41 protruding upward from the bag surface 12 in the zipper orthogonal cross section. In this embodiment, the protrusion 41 has an inner protrusion 42 provided on the inner side and an outer protrusion 43 provided on the outer side. The inner protrusion 42 and the outer protrusion 43 are separated in the width W direction. The inner jaw 42j is formed by bending the upper end of the inner protrusion 42 inward. The outer jaw 43j is formed by bending the upper end of the outer projection 43 outward. The inner jaw portion 42j and the outer jaw portion 43j extend in directions away from each other, and constitute a diffusing portion. In the present embodiment, the overhang of the inner jaw portion 42j is formed larger than the outer jaw portion 43j. An inner recess 42 d is formed at the upper end of the inner protrusion 42. An outer recess 43 d is formed at the upper end of the outer protrusion 43. The inner recess 42d and the outer recess 43d are collectively referred to as a recess 41d. Details of the configuration of the recess 41d will be described later. The protrusion 41 is fixed to the bag surface 12 at the end opposite to the side where the recess 41d is formed. The height of the protrusion 41 is formed to be approximately the same as the height of the protrusion 21.

  The sandwiching rail 50 is formed with a sandwiching portion 51 that sandwiches the protruding portion 41 when the click zipper 19 is closed in the zipper orthogonal cross section. The sandwiching portion 51 extends downward from the bag back surface 13. In the present embodiment, the sandwiching portion 51 has an inner attachment portion 52 provided on the inner side and an outer attachment portion 53 provided on the outer side. The inner attachment portion 52 and the outer attachment portion 53 are configured such that, when the protruding portion 41 is fitted into the holding portion 51, the inner attachment portion 52 contacts the inner protrusion 42 from the inner side, and the outer attachment portion 53 changes from the outer portion to the outer protrusion 43. In contact with each other, the gap is larger in the width W direction than the gap between the inner protrusion 42 and the outer protrusion 43. An inner claw portion 52c is formed by bending the lower end of the inner attachment portion 52 outward. The lower end of the outer attachment portion 53 is bent inward to form an outer claw portion 53c. The inner claw part 52c and the outer claw part 53c extend in a direction approaching each other and constitute a proximity part. The inner claw portion 52 c and the outer claw portion 53 c are arranged so that the inner claw portion 52 c comes into contact with the inner protrusion 42 and the outer claw portion 53 c comes into contact with the outer protrusion 43 when the projecting portion 41 is fitted into the holding portion 51. Is formed. In the present embodiment, the overhang of the inner claw portion 52c is formed larger than the outer claw portion 53c. The clamping part 51 is fixed to the bag back surface 13 at the end opposite to the side where the inner claw part 52c and the outer claw part 53c are formed. The height of the clamping part 51 is formed to be approximately the same as the height of the protruding part 41.

  Next, the configuration of the protruding rail 40 in the zipper extending direction E will be described mainly with reference to FIG. 2B and also with reference to FIGS. 2A and 1 as appropriate. In the zipper extending direction E, the protrusion rail 40 is formed with recesses 41d intermittently. The recess 41d is formed downward from the upper end of the protruding rail 40 (see FIG. 2A). The depth (distance in the height H direction) of the recess 41d is approximately 1/3 to 2/3 of the distance from the upper end of the protruding portion 41 to the inner jaw portion 42j and the outer jaw portion 43j. Then it is ½. The recess length 41dL (distance in the zipper extension direction E), which is the length of the recess 41d, can be determined as appropriate, but the engagement force between the protruding rail 40 and the sandwiching rail 50 when the composite zipper 15 is closed is maintained. From this point of view, the thickness is preferably 1 mm or less, more preferably 0.3 to 0.9 mm, and 0.7 mm in the present embodiment. In the present embodiment, in the zipper extending direction E, the recesses 41d are formed at equal intervals in synchronization with the inner recess 42d and the outer recess 43d. The distance between the adjacent depressions 41d is preferably about 1 to 3 times the depression length 41dL from the viewpoint of making the feel perceived by the finger when closing the zipper 15 small (1.5 Including double and double). In this embodiment, it is 2.5 mm. In the present embodiment, the convex rail 20, the concave rail 30, and the sandwiching rail 50 other than the protruding rail 40 are not formed with a discontinuous structure such as the depression 41d in the protruding rail 40, and are formed smoothly. ing. By forming the convex rail 20 and the concave rail 30 smoothly, the sealed zipper 18 is configured to be in close contact with the water so that it does not pass water when closed.

  In the zipper bag 10 configured as described above, when closing the composite zipper 15, the convex rail 20, the concave rail 30, and the protrusion are first formed at the end of the composite zipper 15 (near one side 10 s of the bag body 11). The rail 40 and the sandwiching rail 50 are picked and fitted so as to be pinched by the fingertips, respectively, and then slid in the zipper extending direction E while the fingertips are being picked. Thereby, the convex rail 20 and the concave rail 30 and the protruding rail 40 and the sandwiching rail 50 are sequentially fitted along the movement of the fingertip. At this time, since the depressions 41d are formed in the protruding rail 40 at a predetermined interval, when the fingertip is slid, the sensation of a bubble (fine vibration) is transmitted to the fingertip, and the composite zipper 15 is closed. Can be realized. If the protruding rail 40 and the sandwiching rail 50 are not fitted, this bubble feeling cannot be realized. Since it is sufficient to feel the presence or absence of the bubble wrap, in this embodiment, the depth of the recess 41d is formed relatively shallow. When the projecting rail 40 and the sandwiching rail 50 are fitted, the convex rail 20 and the concave rail 30 arranged in parallel to these are also fitted. Further, the composite zipper 15 has the convex rail 20 and the protruding rail 40 that are translucent in blue and the concave rail 30 and the sandwiching rail 50 that are yellow. The yellow of 50 is reflected in the blue color of the convex rail 20 and the protruding rail 40, and the convex rail 20 and the protruding rail 40 appear green. By this color change, it is possible to visually recognize that the composite zipper 15 is closed, and it can be confirmed with two senses that the composite zipper 15 is closed together with the petit feeling of the fingertip.

  Since the depression 41 d is formed in the protruding rail 40, a gap is formed in the closed click zipper 19, but since the sealed zipper 18 is provided inside the click zipper 19, the composite zipper 15 As a whole, airtightness can be ensured, and it is also suitable to put a liquid material in the bag body 11. In addition, since the zipper bag 10 has a larger overhang in the inner jaw portion 22jB than in the outer jaw portion 22jA, the engagement force (difficulty of opening) of the sealed zipper 18 is greater on the inner side than on the outer side. Is bigger. In addition, the click zipper 19 is formed so that the inner jaw portion 42j has a larger overhang than the outer jaw portion 43j and the inner claw portion 52c has a larger overhang than the outer claw portion 53c. The zipper 19 can be prevented from opening, and the sealing performance can be improved. Considering this point, the zipper bag 10 exhibits excellent sealing properties and is difficult to leak even if a liquid material is put in the bag body 11.

  On the other hand, when opening the composite zipper 15 in the zipper bag 10, first, the click zipper 19 is picked by picking the end portions of the bag surface 12 and the bag back surface 13 on the opening 10 h side and moving the end portions in directions away from each other. Is disengaged, and then the sealing zipper 18 is disengaged. At this time, the outer jaw portion 22jA of the sealing zipper 18 has a smaller overhang than the inner jaw portion 22jB, and therefore, when opening from the outside, the jaw portion 22jA can be opened with a smaller force than when opening from the inside. If the engagement force on the outside of the sealed zipper 18 is too large, a large force is required for opening, and the bag body 11 (especially the bag body 11 around the connection portion of the sealed zipper 18) before the sealed zipper 18 opens. ) May be damaged. In the zipper bag 10, the outside of the sealed zipper 18 has a smaller overhang of the jaw portion 22 j and a smaller engagement force than the inside, so that the bag body 11 is prevented from being damaged when opened while maintaining the sealing property as described above. be able to. Furthermore, since the zipper bag 10 is provided with the click zipper 19 outside the sealed zipper 18, even if the engaging force on the outside of the sealed zipper 18 is relatively small, the sealed zipper 18 is not intended from the outside. It can be prevented from opening. In order to prevent the sealing zipper 18 from unintentionally opening from the outside, the engagement force on the outside of the click zipper 19 may be made larger than the engagement force on the outside of the sealing zipper 18. By comprising in this way, even if the bag main body 11 around the click zipper 19 is damaged, the bag main body 11 around the sealed zipper 18 is prevented from being damaged, so that the sealing performance can be maintained. The engagement force can be adjusted by the contact distance (length) of the two members to be engaged. When the contact distance is long, the engagement force is large, and when the contact distance is short, the engagement force is small. Further, the zipper bag 10 has both the function of preventing the click zipper 19 from unintentionally opening the sealed zipper 18 from the outside and the function of detecting with the finger that the composite zipper 15 has been properly closed. Therefore, it is not necessary to separately provide zippers having both functions, and a decrease in effective capacity can be suppressed.

  In order to manufacture the zipper bag 10 configured as described above, first, a synthetic resin raw material that is a raw material of the bag main body 11, the sealed zipper 18 and the click zipper 19 is charged into an extruder and melted. The discharge part of the extruder is provided with a circular die and a zipper die. The synthetic resin material that has been melted is extruded in a cylindrical shape by a circular die into a synthetic resin sheet that becomes the bag body 11 (sheet extrusion molding step). Further, the melted synthetic resin raw material is extruded with a zipper die, which is a synthetic resin material that becomes the composite zipper 15, after being colored and extruded into a cylindrical synthetic resin sheet. Are joined along (zipper joining step). When the zipper resin is bonded to the synthetic resin sheet, the depression forming roller is pressed against the zipper resin of the portion that becomes the protruding rail 40 to intermittently form the depression 41d in the portion corresponding to the protruding portion 41 (dent forming step). . The depression forming roller is a roller in which a protrusion corresponding to the depression 41d is formed on a cylindrical side surface. The synthetic resin sheet to which the zipper resin is bonded is squeezed upward while being pulled upward by a pinch roller provided on the downstream side of the depression forming roller (pinch process).

  The synthetic resin sheet pinched by the pinch roller (the cylinder was crushed while being pulled) was distorted, folded in a flat shape on the downstream side of the pinch roller, and cylindrical outside the zipper resin. Is cut along the longitudinal direction (cutting step). Further, it is melted and sealed to the size of the zipper bag 10 (melting sealing step). The space | interval fuse | melted here is a space | interval of the both sides 10s (refer FIG. 1) of the zipper bag 10. FIG. Moreover, the part corresponding to 10s of both sides 10s of the fuse | melted zipper bag 10 is sealed by the heat welding accompanying melting. By these cutting process and fusing sealing process, the opening 10h is formed, and the zipper bag 10 is obtained. The zipper bag 10 sealed on both sides 10s is packed for shipping after checking the sealed part on both sides 10s and the composite zipper 15 in the downstream process. Note that the cutting step and the fusing sealing step may be performed simultaneously, and the fusing sealing step may be performed prior to the cutting step.

  In the above description, the outer jaw portion 22jA of the projection 21 constituting the convex rail 20 is formed to have a smaller overhang than the inner jaw portion 22j, so that the engagement force with the concave rail 30 is greater on the outer side. Although it was configured to be smaller, instead of this configuration, or together with this configuration, the claw portion 31c of the concave rail 30 is formed smaller on the outer side than on the inner side, The engaging force with the concave rail 30 may be configured such that the outer side is smaller than the inner side.

  In the above description, the protruding rail 40 has two protrusions, that is, the inner protrusion 42 and the outer protrusion 43 in the zipper orthogonal cross section, but may be configured by one protrusion. At this time, the inner protrusion 42 and the outer protrusion 43 may be brought into close contact with each other to form an integrated outline.

  In the above description, the inner jaw portion 42j is formed to have a larger projection than the outer jaw portion 43j, and the inner claw portion 52c is formed to have a larger projection than the outer jaw portion 53c. The overhangs of both the portion 42j and the outer jaw portion 43j may be formed with the same size, and / or the overhangs of both the inner claw portion 52c and the outer claw portion 53c may be formed with the same size.

  In the above description, the depression 41d is formed in both the inner protrusion 42 and the outer protrusion 43, but it may be formed in either one. In addition, although the depression 41 d is intermittently formed in the protruding portion 41, the depression may be formed in the clamping portion 51. At this time, the depression may be formed in both the inner side attaching part 52 and the outer side attaching part 53, or may be formed in either one.

  In the above description, the convex rail 20 and the protruding rail 40 are fixed to the bag surface 12, and the concave rail 30 and the holding rail 50 are fixed to the bag back surface 13. And the concave rail 30 and the protruding rail 40 may be fixed to the bag back surface 13.

  In the above description, the convex rail 20 and the protruding rail 40 are translucent, and the concave rail 30 and the sandwiching rail 50 are not translucent. However, either the convex rail 20 or the concave rail 30 and the protruding rail are used. 40 and the holding rail 50, that is, one of the rails to be fitted may not be translucent but the other may be translucent, and all of these four rails 20, 30, 40, 50 are semi-transparent. It may be transparent. Further, although the convex rail 20 and the protruding rail 40 are blue and the concave rail 30 and the sandwiching rail 50 are yellow, the color of the convex rail 20 and the concave rail 30 and / or the projecting rail 40 and the sandwiching rail 50 are used. The colors may be interchanged with each other, or each or one of them may be a different color (a combination of colors other than blue and yellow may be used). That is, you may select suitably the combination of the color which can visually recognize the difference in color when the rail which mutually fits does not fit.

10 Zipper bag 10h Opening 11 Bag body 15 Composite zipper 18 Sealed zipper 19 Click zipper 20 Convex rail 21 Protrusion 22 Umbrella portion 22j Jaw portion 22t Tip 30 Concave rail 30g Groove 31 U-shaped member 31c Claw portion 31h U-shaped opening 40 Protruding rail 41 Protruding part 41d Dimple 42 Inner protruding part 42j Inner jaw part 43 Outer protruding part 43j Outer jaw part 50 Holding rail 51 Holding part 52 Inner attachment part 52c Inner claw part 53 Outer attachment part 53c Outer claw part E Zipper extension direction

Claims (3)

A sealing zipper formed of a flexible synthetic resin and sealing when closed;
An auxiliary zipper provided along the hermetic zipper at a predetermined interval from the hermetic zipper and formed of a flexible synthetic resin;
The hermetic zipper has a convex rail that appears as a projection in a cross section of the hermetic zipper orthogonal to the direction in which the hermetic zipper extends, and a groove that wraps the tip of the projection in the hermetic zipper orthogonal cross section when the hermetic zipper is closed A concave rail appearing as a groove forming member to be formed;
The concave rail is formed with a claw portion that is bent so that the tips adjacent to the opening of the groove forming member in the cross section of the sealed zipper are close to each other;
When the convex rail is suddenly narrowed after gradually widening as viewed in the middle direction from the tip of the projection in the cross section of the sealed zipper, the claw when fitted to the concave rail A jaw is formed on the part;
The engaging force between the claw part and the jaw part when the claw part and the jaw part are engaged is opposite to the auxiliary zipper on the side adjacent to the auxiliary zipper in the cross-section of the sealed zipper. Formed smaller than the side ;
The auxiliary zipper has a protruding rail formed with a protruding portion protruding in an auxiliary zipper orthogonal cross section orthogonal to the direction in which the auxiliary zipper extends, and a holding rail formed with a holding portion for holding the protruding portion in the auxiliary zipper orthogonal cross section And having
A depression is intermittently formed in at least one of the protruding rail and the holding rail in a direction in which the auxiliary zipper extends ;
The projecting rails, in the auxiliary zipper orthogonal cross-section, includes an inner protrusion arranged closer to the closed zipper and an outer projection provided on the side farther from the sealing zipper away from said inner protrusion Consisting of:
When the auxiliary zipper closes the auxiliary zipper, in the auxiliary zipper orthogonal cross section, the inner attachment portion that comes into contact with the inner protrusion from the side close to the sealing zipper, and the sealing with respect to the outer protrusion Comprising an outer splice that contacts the side farther from the zipper ;
The protruding rail is formed with a diffusing portion that is bent in a direction in which tips of the inner protrusion and the outer protrusion are separated from each other;
The sandwiching rail is formed with a proximity portion that engages with the diffusion portion by bending the tips of the inner side attachment portion and the outer side attachment portion toward each other;
The auxiliary zipper is configured such that the tip of the inner protrusion and the tip of the outer protrusion can contact when the diffusion portion passes through the proximity portion;
Composite zipper. The engagement force between the inner protrusion and the inner attachment portion is formed larger than the engagement force between the outer protrusion and the outer attachment portion;
The composite zipper according to claim 1 . A bag body formed with an opening through which an object can be taken in and out;
A composite zipper according to claim 1 or 2 ;
The auxiliary zipper is provided closer to the opening of the bag body than the sealed zipper;
Zipper bag.

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