JP5746576B2 - Zipper and zipper bag - Google Patents

Description

  The present invention relates to a zipper and a zipper bag, and more particularly to a zipper that engages a rail formed of a synthetic resin and closes the zipper and a zipper bag using the zipper.

  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 performance, it is conceivable that a zipper with high sealing performance is provided in parallel with the zipper having a discontinuous structure, but if two zippers are provided in parallel, the distance between each zipper Becomes wider and deviates from the range that can be pressed by the fingertips, making it difficult to obtain a feel when the zipper is closed.

  In view of the above-described problems, an object of the present invention is to provide a zipper that can be sensed with a finger while being easily closed, and a zipper bag using the zipper.

  In order to achieve the above object, the zipper according to the first aspect of the present invention is a zipper 15 formed of synthetic resin, for example, as shown in FIG. 2; the zipper orthogonal to the direction in which the zipper 15 extends A first rail 21 that appears as a first protrusion in the cross section, a second rail 22 that is provided parallel and adjacent to the first rail 21 and appears as a second protrusion in the zipper orthogonal cross section, and a first rail One engaging member 20 provided between the rail 21 and the second rail 22 and having a third rail 23 appearing as a third protrusion in the zipper cross section; and when the zipper 15 is closed, A fourth rail 34 that fits between the first rail 21 and the third rail 23 and appears as a fourth protrusion in the zipper orthogonal cross section, and the second rail 22 and the third rail when the zipper 15 is closed 23 And the other engaging member 30 having a fifth rail 35 appearing as a fifth projection in the zipper orthogonal cross section; and at least one of the first rail 21 and the fourth rail 34, or the first rail A recess 35 d is formed intermittently in at least one of the second rail 22 and the fifth rail 35.

  With this configuration, the third rail serves as both a member that sandwiches the fourth rail and a member that sandwiches the fifth rail, and the width of the zipper is relatively narrow. Sense of being closed with a finger while ensuring sealing because a recess is intermittently formed in at least one of the second rail and the fourth rail, or at least one of the second rail and the fifth rail. Can do.

  Further, for example, as shown in FIG. 2, the zipper according to the second aspect of the present invention is the zipper according to the first aspect of the present invention described above, when the other engaging member 30 closes the opening 10h. A sixth rail 36 that appears as a sixth projection in the zipper orthogonal cross section, fitting the first rail 21 between the first rail 21 and the fourth rail 34; at least one of the first rail 21 and the sixth rail 36 When the opening 10h is closed, a sealing protrusion 21s that urges the first and sixth protrusions in contact with each other in contact with each other in the zipper orthogonal cross section is formed continuously along the direction in which the zipper 15 extends. .

  Here, urging the contacted one of the first projection and the sixth projection is that the sealing projection is formed on the first rail and separated from the sixth rail. This means that the projection contacts and urges the sixth rail, and when the sealing projection is formed on the sixth rail and is separated from the first rail, the sealing projection is the first. It means that it urges in contact with the rail. Typically, the sealing projection extends along the first rail so as to urge the first projection on the first rail toward the inner side of the bag body and bias the sixth projection in the zipper cross-section when the opening is closed. It is formed continuously.

  If comprised in this way, the sealing property of a zipper can be improved. In addition, the engagement protrusion which protruded toward the side of the protrusion in which the sealing protrusion is formed in the front-end | tip in the zipper orthogonal cross section of the protrusion in which the sealing protrusion is not formed among the 1st protrusion and the 6th protrusion. The zipper may be formed continuously along the extending direction. Typically, when the sealing protrusion is formed on the first rail, the engaging protrusion protruding to the fourth protrusion side on the tip of the sixth protrusion in the zipper orthogonal cross section is provided on the sixth rail. It may be formed continuously along.

  Further, the zipper according to the third aspect of the present invention is a zipper 15 formed of a synthetic resin, for example, as shown in FIG. 2; the first protrusion on the zipper orthogonal cross section orthogonal to the extending direction of the zipper 15 A first rail 21 appearing as a second rail 22 parallel to and adjacent to the first rail 21 and appearing as a second protrusion on the zipper orthogonal cross section, and the first rail 21 and the second rail The first rail 21 and the first rail 21 when the zipper 15 is closed. The third rail 23 that fits between the second rail 22 and the third rail 23 when the zipper 15 is closed. Zipper The other engaging member 30 having a fifth rail 35 that appears as a fifth protrusion in an orthogonal cross section; between the other engaging member 30 and the fourth rail 34 when the opening 10h is closed. A sixth rail 36 that appears as a sixth projection in the zipper orthogonal cross section for fitting the first rail 21 is provided; when the opening 10h is closed in at least one of the first rail 21 and the sixth rail 36 In the zipper orthogonal cross section, a sealing protrusion 21s that urges the contacted counterpart of the first protrusion and the sixth protrusion is formed continuously along the direction in which the zipper 15 extends; the first rail 21, the second rail A recess 35 d is intermittently formed in one or more of the rail 22, the fourth rail 34, and the fifth rail 35.

  With this configuration, the third rail serves as both a member that sandwiches the fourth rail and a member that sandwiches the fifth rail, and the width of the zipper is relatively narrow. A sealing protrusion is formed on at least one of the first rail and the sixth rail, and the depression is intermittently formed in one or more of the first rail, the second rail, the fourth rail, and the fifth rail. It is possible to detect the feeling of being closed with a finger while ensuring the sealing property.

  Moreover, the zipper bag according to the fourth aspect of the present invention includes, for example, as shown in FIGS. 1 and 2, a bag body 11 having an opening 10h into which an object can be taken in and out; and the first aspect of the present invention described above. Thru | or the zipper 15 which concerns on any one aspect of 3rd aspect; One engagement member 20 is on the one surface 12 of the bag main body 11 which overlaps when the opening 10h is closed from the 1st rail 21 In addition, the second rail 22 is provided so as to be on the end side of the opening 10h, and the other engagement member 30 is provided on the other surface 13 of the bag body 11, so that the opening 10h can be repeatedly opened and closed. It is configured.

  If comprised in this way, it will become a bag which can be opened easily and can open and close repeatedly which can perceive the feeling closed with the finger | toe.

  Moreover, the zipper bag which concerns on the 5th aspect of this invention is a zipper bag which concerns on the said 4th aspect of this invention, for example, as shown in FIG. 2, The hollow 35d is formed in the 5th rail 35. As shown in FIG. Yes.

  If comprised in this way, it will become possible to suppress that the object accommodated in the bag main body enters between a 4th rail and a 5th rail, and can improve sealing performance.

  Moreover, the zipper bag which concerns on the 6th aspect of this invention is the zipper bag which concerns on the said 4th aspect or 5th aspect of this invention, for example, as shown in FIG. A seventh rail 37 that appears as a seventh protrusion in the zipper orthogonal cross section that fits the second rail 22 between the fifth rail 35 when 10h is closed; the seventh rail 37 is open It is comprised so that one surface 12 may be contacted when 10h is closed.

  If comprised in this way, the sealing property of the opening side in a zipper can be improved.

  Moreover, when the zipper bag which concerns on the 7th aspect of this invention is shown, for example with reference to FIG. 1, in the zipper bag 10 which concerns on any one aspect of the said 4th aspect thru | or 6th aspect of this invention, One of the one engaging member 20 and the other engaging member 30 is colored in the first color, and the other is colored in the second color different from the first color and the zipper 15 is closed when the zipper 15 is closed. When the first color is mixed, the first color and the second color become a third color different from the second color.

  If comprised in this way, it can confirm that the zipper closed with both the skin sensation which acts on a finger | toe resulting from a hollow, and the vision by a color change.

  According to the present invention, the third rail serves as both a member that sandwiches the fourth rail and a member that sandwiches the fifth rail, and the width of the zipper is relatively narrow. Sense of being closed with a finger while ensuring sealing because a recess is intermittently formed in at least one of the second rail and the fourth rail, or at least one of the second rail and the fifth rail. Can do.

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 back rail which comprises the zipper which concerns on embodiment of this invention. It is a flowchart explaining the manufacturing process of the zipper bag 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 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 back rail 30 as the other engaging member constituting the zipper 15. The zipper bag 10 includes a bag body 11 and a 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 as one surface, and the remaining one is the bag back surface 13 as 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 zipper 15 so as to cross the opening 10h, in other words, to circulate around the opening 10h.

  The zipper 15 has no slider and is a line fastener that can be attached and detached by a human hand. The zipper 15 includes a front rail 20 as one engagement member and a back rail 30. The front rail 20 has an inner rail 21 as a first rail, an outer rail 22 as a second rail, and an inner rail 23 as a third rail. The back rail 30 includes a back inner rail 34 as a fourth rail, a back outer rail 35 as a fifth rail, a back inner rail 36 as a sixth rail, and a back inner rail 36 as a seventh rail. And an outer rail 37. Both the front rail 20 and the back rail 30 are made of flexible synthetic resin. In the present embodiment, the front rail 20 is formed of a translucent material and is colored blue, and the back rail 30 is colored yellow.

  The partial cross-sectional view of FIG. 2A shows a cross section orthogonal to the zipper extension direction E (see FIG. 1), which is the direction in which the zipper 15 extends, that is, a zipper cross section. In the zipper orthogonal cross section, the front rail 21, the front rail 22, the front rail 23, the back inner rail 34, the back outer rail 35, the back inner rail 36, and the back outer rail 37 appear as protrusions, respectively. . Hereinafter, the detailed structure of the front rail 20 and the back rail 30 in a zipper orthogonal cross section is demonstrated. In the following description of the zipper orthogonal cross section, for the sake of convenience, the inside of the bag body 11 in the height H direction with respect to the bag surface 12 or the bag back surface 13 (the side where the opposite bag back surface 13 or the bag surface 12 exists) is used. The upper side (or the upper side) is referred to as the inner side (inner side) and the opening 10h side (end side) is referred to as the outer side.

  The front rail 20 is arranged in the order of the front rail 21, the front rail 23, and the front rail 22 from the inner side of the bag body 11 to the outer side (opening 10 h side). The width W of the front rail 20 is approximately 3 to 7 mm in the present embodiment. The inner rail 21 has a substantially rectangular basic shape, and is formed in a hook shape in which the upper outer side (the rail 23 side in the front) is removed from the center of the rectangle. The inner rail 21 is formed with a sealing protrusion 21s protruding further inward from the upper part of the inner side. The length in the height H direction of the inner rail 21 is shown to be higher than the width W of the front rail 20 for the sake of convenience in FIG. 2A, but is approximately 0.1 to 0.5 mm in the present embodiment. is there. The outer rail 22 is configured in line symmetry with the inner rail 21 excluding the sealing protrusion 21s. With such a configuration, the hook-like punches of the inner rail 21 and the outer rail 22 face each other and face the inner rail 23 side.

  The front rails 23 are not formed with hook-like punches like the inner rails 21 and the outer rails 22 but are formed in an elongated rectangular shape. The front rail 23 has a length in the height H direction that is less than or equal to the inner rail 21 and the outer rail 22, and is typically about 0. 0 of the inner rail 21 (outer rail 22). It is formed 4 to 1.0 times. In the present embodiment, the upper end of the front rail 23 is located at a position lower than the front end of the hook of the inner rail 21 (outer rail 22). A front gap 21 g is formed between the front rail 23 and the front rail 21, and a front gap 22 g is formed between the front rail 23 and the front rail 22.

  The back rail 30 is arranged in the order of the back innermost rail 36, the back inner rail 34, the back outer rail 35, and the back outermost rail 37 from the inner side to the outer side of the bag body 11. The width W of the back rail 30 is approximately 3 to 7 mm in the present embodiment. The back inner rail 34 and the back outer rail 35 have the same shape as the outer rail 22, but the arrangement is different from the relationship between the front rail 21 and the outer rail 22. That is, the back inner rail 34 and the back outer rail 35 are arranged in such a manner that the surfaces on the opposite side to the surface on which the punch is formed face each other. As a result, the back inner rail 34 is turned inward, and the back outer rail 35 is turned outward. The length in the height H direction of the back inner rail 34 and the back outer rail 35 is about the same as the width W of the back rail 30 in FIG. 2A for convenience, but in this embodiment, the front rail Like 21, it is approximately 0.1 to 0.5 mm.

  The back innermost rail 36 and the back outermost rail 37 have substantially the same shape as the rail 23 in the table, respectively, but differ in the following points. The back innermost rail 36 is formed with an engaging projection 36p projecting toward the back inner rail 34 at the upper end. The length in the height H direction of the back inner rail 36 is formed to be about 0.4 to 1.0 times the back inner rail 34 (back outer rail 35). In the present embodiment, the upper end of the back inner rail 36 exists at a position lower than the tip of the hook of the back inner rail 34 (back outer rail 35). On the other hand, the back outermost rail 37 is the same as the front rail 23 in that no protrusion is formed, but is longer than the front rail 23 in the height H direction. The length of the back outermost rail 37 in the height H direction is formed such that the upper end is in contact with the bag surface 12 when the zipper 15 is closed. In this embodiment, about 1 of the back inner rail 34 is formed. .1 to 1.5 times. A central gap 33g is formed between the back inner rail 34 and the back outer rail 35, and a back inner gap 34g is formed between the back inner rail 34 and the back innermost rail 36. A back outer gap 35 g is formed between the outermost rail 37.

  When the front rail 20 and the back rail 30 are fitted, that is, when the zipper 15 is closed, the front rail 23 enters the center gap 33g, the front rail 21 enters the back gap 34g, and the back rail 34 is the front rail 34. The inner gap 21g enters, the outer rail 22 enters the back outer gap 35g, and the back outer rail 35 enters the outer gap 22g. At this time, the distance in the width W direction of each rail 21, 22, 23, 34, 35 is larger than the distance in the width W direction of each gap 34g, 35g, 33g, 21g, 22g in which they are fitted. It is good to be comprised so that it may enter into each clearance gap by elastically deforming. In this way, the distance in the width W direction of the central gap 33g is formed to be smaller than the width W of the front rail 23, and the back inner rail 34 is bent inward and the back outer rail 35 is bent outward. Is desirable. Then, the back inner rail 34 presses the front inner rail 21, and on the other hand, since the back innermost rail 36 exists on the inner side of the front inner rail 21, movement to the inside is suppressed, The front inner rail 21 and the rear inner rail 34 exert forces on each other. When the front inner rail 21 enters the back inner gap 34g and the rear inner rail 34 enters the front inner gap 21g, the hook of the front inner rail 21 and the hook of the rear inner rail 34 are engaged. When the inner rail 21 and the back inner rail 34 exert forces on each other, the combined hooks of the front inner rail 21 and the rear inner rail 34 are difficult to come off.

  The above-described interaction between the front rail 21 and the back inner rail 34 occurs similarly between the front rail 22 and the back outer rail 35. At this time, the back outermost rail 37 acts in the same manner as the back innermost rail 36. Since the inner rail 21 is formed with the sealing protrusion 21s, the sealing protrusion 21s acts to be pressed against the innermost rail 36 when the inner rail 21 enters the rear inner gap 34g. Thereby, the airtightness of the front rail 21, the back inner rail 34, and the back innermost rail 36 is improved. Further, since the sealing protrusion 21 s enters between the engagement protrusion 36 p formed on the back innermost rail 36 and the bag back surface 13, the sealing performance can be further improved. On the other hand, when the back outermost rail 37 is in contact with the bag surface 12, the sealing property on the opening 10h side can be improved.

  Next, the configuration of the back rail 30 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 back outer rail 35 is formed with recesses 35d intermittently. The recess 35 d is formed downward from the upper end of the back outer rail 35. The depth of the recess 35d (the distance in the height H direction) is about 1/3 to 2/3 of the distance between the upper end of the back outer rail 35 itself and the upper end of the punch forming the hook. The recess length 35dL (distance in the zipper extension direction E), which is the length of the recess 35d, can be determined as appropriate, but is 1 mm or less from the viewpoint of suppressing a decrease in sealing performance when the zipper 15 is closed. Well, 0.3 to 0.9 mm is more preferable, and 0.7 mm in this embodiment. In the present embodiment, the recesses 35d are formed at equal intervals in the zipper extending direction E. The distance between the adjacent depressions 35d, in other words, the protrusion length 35pL, which is the length of the protrusion 35p where the depression 35d is not formed, is not less than the depression length 35dL, and is sealed when the zipper 15 is closed. From the viewpoint of improving the property, it is preferably 1.5 times or more of the recess length 35 dL, more preferably 2 times or more, and further preferably 3 times or more. In this embodiment, it is 2.5 mm. Thus, when the recess length 35dL is 1 mm or less and the protrusion length 35pL is formed to be 1.5 times or more of the recess length 35dL, the front rail 20 and the back rail 30 when the zipper 15 is closed Since the return of the impact of the fitting to the finger is reduced, the burden on the finger is reduced, and the deterioration of the sealing performance when the opening is closed can be suppressed. In the present embodiment, the rails 21, 22, 23, 34, 36, and 37 other than the back outer rail 35 are smoothly formed without a discontinuous structure such as a depression.

  In the zipper bag 10 configured as described above, when the zipper 15 is closed, first, the front rail 20 and the back rail 30 are sandwiched by the fingertips at the end of the zipper 15 (near one side 10s of the bag body 11). Then, the fingertips are fitted and then slid in the zipper extending direction E with the fingertips being picked. Accordingly, the front rail 20 and the back rail 30 are sequentially fitted along the movement of the fingertip. At this time, since the recesses 35d are formed in the back outer rail 35 at predetermined intervals, when the fingertip is slid, a sensation (small vibration) is transmitted to the fingertip and the zipper 15 is closed. Can be realized. If the front rail 20 and the back rail 30 are not fitted, this bubble sensation cannot be realized. Since it is sufficient that the presence or absence of the bubble wrap is felt, in this embodiment, the depth of the recess 35d is formed relatively shallow, and the deterioration of the sealing property when the zipper 15 is closed is suppressed. Further, since the recess 35d is formed in the back outer rail 35 and is not formed in the back inner rail 34, the back inner rail 34 can ensure sealing, and a liquid material is put into the bag body 11. Also suitable for that.

  Moreover, since the width | variety W of the front rail 20 and the back rail 30 is formed small with the zipper 15 about 3-7 mm, the area which a finger | toe contacts when it picks with a fingertip is comparatively small. As a result, the shape of the fingertip picked when closing the zipper 15 can be made into a natural circular shape (for example, when picking up with the thumb and forefinger, a ring is formed with the thumb and forefinger). It becomes easy to put power into. Assuming that the width W of the zipper 15 is large, in order to increase the contact area of the fingers when picked with the fingertips, the fingertips are brought into contact with each other up to the first joint. It is difficult to apply force to the zipper 15 and it is difficult to close the zipper 15.

  Further, since the zipper 15 is formed such that the front rail 20 is translucent blue and the back rail 30 is yellow, when the front rail 20 and the back rail 30 are fitted, the yellow color of the back rail 30 appears. Reflected in the blue color of the rail 20, the front rail 20 appears green. That is, the color of the front rail 20 when the front rail 20 and the back rail 30 are fitted looks green, neither the original blue of the front rail 20 nor the yellow of the back rail 30. By this color change, it is possible to visually recognize that the zipper 15 is closed, and it can be confirmed with two senses that the zipper 15 is closed together with the petit feeling of the fingertip. The zipper 15 is opened by picking the end of the bag body 11 on the opening 10h side, gripping the bag surface 12 side with the fingertips of one hand and the bag backside 13 side with the fingertips of the other hand, This can be done easily by moving them in directions away from each other.

  Next, the manufacturing method of the zipper bag 10 is demonstrated with reference to the flowchart of FIG. First, the synthetic resin raw material which is the raw material of the bag main body 11 and the front rail 20 and the back rail 30 is put into an extruder and melted (St1). 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 process, St2). Further, the melted synthetic resin raw material is extruded with a zipper die, which is a synthetic resin material that becomes the zipper 15 after being colored, and is extruded into a cylindrical synthetic resin sheet in the longitudinal direction. Are joined together (zipper joining step, St3).

  When the zipper resin is joined to the synthetic resin sheet, the depression forming roller is pressed against the zipper resin of the portion that becomes the back rail 30 to intermittently form the depression 35d in the portion that becomes the back outer rail 35 (a depression forming step, St4). The depression forming roller is a roller in which a protrusion corresponding to the depression 35d 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 dent forming roller (pinch step, St5). 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, St6). Further, it is melted and sealed to the size of the zipper bag 10 (melting sealing step, St7). 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 step (St6) and fusing and sealing step (St7), an opening 10h is formed and becomes the zipper bag 10. The zipper bag 10 whose both sides 10s are sealed is packed for shipping after checking the sealing part and the zipper 15 on both sides 10s in the downstream process. The cutting step (St6) and the fusing and sealing step (St7) may be performed simultaneously, and the fusing and sealing step (St7) may be performed before the cutting step (St6).

  In the zipper bag 10 manufactured as described above, since the recess 35d is formed by the recess forming roller, even if the back inner rail 34 and the back outer rail 35 are close to each other within 3 to 7 mm, Only the depression 35d can be formed, and the zipper 15 has a relatively narrow width and can be easily closed, but a bubble feeling that can be felt when the zipper 15 is closed can be obtained.

  In the above description, the recesses formed intermittently are formed only in the back outer rail 35. However, the back innermost rail 36 and / or the back outermost rail 37 are provided to ensure the sealing performance. In such a case, a depression may be intermittently formed in one or a plurality of rails among the inner rail 21, the outer rail 22, the rear inner rail 34, and the rear outer rail 35. Thus, instead of providing the back innermost rail 36 and / or the back outermost rail 37 as a premise that the depression is formed intermittently in one or a plurality of rails, the central gap 33g The distance in the width W direction of the rail is formed to be smaller than the distance in the width W direction of the front rail 23, and the fitted rail is elastically deformed when the front rail 23 enters the central gap 33g. It is good to do. However, it is preferable that the back outer rail 35 or the outer rail 22 is formed with a recess from the viewpoint of improving the hermeticity when the bag body 11 is stored in a liquid state, and when the zipper 15 is closed. From the viewpoint of increasing the vibration when the deflection is reduced and the recess collides with the other rail, it is preferable that the recess is formed in the back outer rail 35 or the back inner rail 34. Taking these into consideration, the depression is preferably formed in the back outer rail 35.

  In the above description, the back rail 30 has the back innermost rail 36 and the back outermost rail 37. However, when the zipper 15 is closed, the front rail 21, the outer rail 22, and the front rail 23, when the back inner rail 34 and the back outer rail 35 can be fitted to secure the sealing property, either or both of the back inner rail 36 and the back outer rail 37 may be omitted. However, even in such a case, the sealing performance can be improved by providing both or one of the back innermost rail 36 and the back outermost rail 37. In addition, as an example that can ensure hermeticity without providing the back innermost rail 36 and the back outermost rail 37, at least one of the back outer rail 35 and the outer rail 22, or the back inner rail 34 and the front rail 21 is formed so that a route in which no depression is formed when the bag surface 12 is traced from the bag surface 12 to the bag back surface 13 via the zipper 15 or the width W direction of the central gap 33g is formed. Is formed so as to be smaller than the distance in the width W direction of the rail 23 in the table, and the fitted rail is elastically deformed when the rail 23 enters the central gap 33g. It is done.

  In the above description, the sealing protrusion is formed on the inner rail 21, but it may be formed on the back innermost rail 36 instead of the inner rail 21 or together with the inner rail 21.

  In the above description, the front rail 20 is translucent and the back rail 30 is not translucent. However, the front rail is not translucent and the back rail 30 may be translucent. Both rails 30 may be translucent. Further, although the front rail 20 is blue and the back rail 30 is yellow, the colors of the front rail 20 and the back rail 30 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).

10 Zipper bag 10h Opening 11 Bag body 12 Bag surface 13 Bag back surface 15 Zipper 20 Front rail 21 Front rail 21s Sealing protrusion 22 Front rail 23 Front rail 30 Back rail 34 Back inner rail 35 Back outer rail 35d Depression 35dL Depression length Length 35pL Projection length 36 Back innermost rail 36p Engagement protrusion 37 Back outermost rail

Claims (5)

A zipper formed of a synthetic resin;
A first rail that appears as a first protrusion in a zipper cross section orthogonal to the direction in which the zipper extends, and a second rail in the zipper orthogonal cross section that is provided parallel to and adjacent to the first rail. One engaging member having a second rail that appears, and a third rail that is provided between the first rail and the second rail and that appears as a third protrusion in the zipper orthogonal cross section;
A fourth rail that fits between the first rail and the third rail when the zipper is closed and appears as a fourth protrusion on the zipper cross-section, and the second rail when the zipper is closed A second engagement member having a fifth rail that fits between the second rail and the third rail and appears as a fifth protrusion on the zipper orthogonal cross section;
Depression before Symbol fifth rail formed intermittently;
The first rail, the second rail, the third rail, and the fourth rail are configured such that no depression is formed;
zipper. The other engaging member has a sixth rail appearing as a sixth projection in the zipper orthogonal cross section, which fits the first rail with the fourth rail when the opening is closed;
At least one of the first rail and the sixth rail is a hermetic seal that urges the first projection and the sixth projection in contact with each other in contact with each other when the opening is closed. Protrusions are formed continuously along the direction in which the zipper extends;
The zipper according to claim 1. A zipper formed of a synthetic resin;
A first rail that appears as a first protrusion in a zipper cross section orthogonal to the direction in which the zipper extends, and a second rail in the zipper orthogonal cross section that is provided parallel to and adjacent to the first rail. One engaging member having a second rail that appears, and a third rail that is provided between the first rail and the second rail and that appears as a third protrusion in the zipper orthogonal cross section;
A fourth rail that fits between the first rail and the third rail when the zipper is closed and appears as a fourth protrusion on the zipper orthogonal cross section; and the fourth rail when the zipper is closed A second engagement member having a fifth rail that fits between the second rail and the third rail and appears as a fifth protrusion on the zipper orthogonal cross section;
A recess is intermittently formed in at least one of the first rail and the fourth rail, or at least one of the second rail and the fifth rail ;
The other engagement member has a sixth rail appearing as a sixth projection in the zipper orthogonal cross section, which fits the first rail between the second rail and the fourth rail when the zipper is closed;
The distance between the first rail in the width direction, which is the direction in which the first rail and the second rail are arranged, is formed to be larger than the gap between the fourth rail and the sixth rail, On the other hand, the distance between the third rail in the width direction is larger than the gap between the fourth rail and the fifth rail, and the other is the direction in which the fourth rail and the fifth rail are aligned. The distance of the fourth rail in the width direction is formed larger than the gap between the first rail and the third rail, and the tip of the first rail and the fourth rail in the zipper orthogonal cross section The front ends are formed in hook shapes that engage with each other, and the first rail, the third rail, the fourth rail, and the sixth rail are elastically deformed when the zipper is closed. Structure It has been;
zipper.   The sixth rail has an engaging protrusion that protrudes toward the fourth rail at the tip of the sixth protrusion;
  The zipper according to claim 2 or claim 3. A bag body formed with an opening through which an object can be taken in and out;
A zipper according to any one of claims 1 to 4 ;
The one engagement member is provided on one surface of the bag body that overlaps when the opening is closed so that the second rail is closer to the end of the opening than the first rail. And the other engagement member is provided on the other surface of the bag body so that the opening can be opened and closed repeatedly;
Zipper bag.

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