Zipper tape and containers with zipper tape
The zipper tape design with eccentrically positioned tips and folded-back hooks addresses engagement issues in containers with shortened bases, ensuring secure sealing and tamper-resistance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- IDEMITSU UNITECH CO LTD
- Filing Date
- 2024-10-31
- Publication Date
- 2026-05-18
AI Technical Summary
Existing zipper tapes with shortened or absent bases face engagement issues during sealing operations, leading to difficulty in maintaining the seal and potential tampering.
A zipper tape design with a first engaging portion in a male shape and a second engaging portion in a hook shape, where the first base is shortened or absent, featuring an eccentrically positioned tip vertex and folded-back hooks, ensuring smooth engagement despite base limitations.
The design enhances reliable engagement and sealing, preventing unauthorized opening, particularly effective in child-resistant containers.
Smart Images
Figure 2026080224000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a zipper tape and a container with a zipper tape.
Background Art
[0002] For example, as described in Patent Document 1, there is known a technique for making it difficult to open a bag with a zipper tape once it is sealed by not joining one base of the zipper tape to the bag body on the opening side of the bag. Patent Document 2 describes a technique for making it even more difficult to open by shortening one base of the zipper tape on the opening side of the bag. By making it difficult to open a bag with a zipper tape once it is sealed, it is possible to prevent tampering of the contents and to realize a so-called child resistance function.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Patent Document 2
Summary of the Invention
Problems to be Solved by the Invention
[0004] [[ID=三十九]]However, when one base of the zipper tape is shortened or not formed at all, the zipper tape may not engage properly in the sealing operation before making it difficult to open the bag with the zipper tape.
[0005] Therefore, an object of the present invention is to provide a zipper tape and a container with a zipper tape capable of smoothly engaging an engaging portion in a sealing operation even when one base of the zipper tape is shortened or not formed at all.
Means for Solving the Problems
[0006] [1] A zipper tape comprising: a first portion including a first base, a first engaging portion projecting from the first base and formed in a male shape, and a second engaging portion projecting from the first base and formed in a hook shape facing away from the first engaging portion; and a second portion including a second base, a third engaging portion projecting from the second base and formed in a female shape that can engage with the first engaging portion, and a fourth engaging portion projecting from the second base and facing toward the third engaging portion and formed in a hook shape that can engage with the second engaging portion, wherein the first base is shortened compared to the second base on the side opposite to the first engaging portion, or is not formed on the side opposite to the second engaging portion, and the first engaging portion includes a shaft portion rising from the first base and a tip portion formed in a mountain shape at the tip of the shaft portion, the apex of the tip portion being eccentric toward the second engaging portion with respect to the center line of the shaft portion. [2] The zipper tape according to [1], wherein when d1 is the distance from the center line to the extension line of the side surface of the shaft portion on the second engagement portion side, and d2 is the distance from the center line to the vertex, d2 / d1 is 0.1 or more and 1.0 or less. [3] The zipper tape according to [1] or [2], wherein, of the slopes formed on both sides of the apex at the tip, the slope formed on the side opposite to the second engaging portion makes an angle θ with the center line on the first base side of 60 degrees or less. [4] The zipper tape according to any one of [1] to [3], wherein the second engaging portion of the tip is folded back toward the first base portion. [5] The zipper tape according to any one of [1] to [4], wherein the tip of the hook-shaped second engaging portion is folded back toward the first base, and the tip of the hook-shaped fourth engaging portion is folded back toward the second base. [6] The zipper tape according to any one of [1] to [5], wherein the tips of a pair of hook-shaped portions included in the third engagement portion formed in the female mold are each folded back toward the second base. [7] The zipper tape according to any one of [1] to [6], wherein the first base is also formed on the side opposite to the second engaging portion with respect to the first engaging portion, and the extension length with respect to the side surface of the shaft portion of the first engaging portion is 0 to 2.0 mm. [8] The zipper tape according to any one of [1] to [7], wherein the first base is also formed on the side opposite to the second engaging portion with respect to the first engaging portion, and when the first engaging portion and the third engaging portion are engaged with each other, the side of the third engaging portion opposite to the fourth engaging portion is aligned with the end of the first base. A zipper tape container wherein the zipper tape described in any one of items [9], [1] to [8] is joined to the inside of a first and second film constituting the container body, the zipper tape is arranged along the opening or planned opening of the container body such that the first engaging portion and the third engaging portion are closer to the opening or planned opening than the second engaging portion and the fourth engaging portion.
[10] The container with a zipper tape according to [9], wherein a portion that can be cut for opening is formed on the opposite side of the opening or the portion intended to be opened relative to the zipper tape. [Effects of the Invention]
[0007] With the above configuration, even if one base of the zipper tape is shortened or partially not formed, causing the male engagement portion to be prone to tilting relative to the male base, the male engagement portion can be more reliably received inside the female engagement portion, and the engagement portion can be smoothly engaged during the sealing operation. [Brief explanation of the drawing]
[0008] [Figure 1] This is a plan view of a container with a zipper tape according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3] This is a cross-sectional view showing an example where the base of the first part is not formed on the opening side relative to the engaging portion. [Figure 4] This diagram illustrates a potential problem that can arise when one end of a zipper tape is shortened. [Figure 5] This figure illustrates the configuration of an embodiment of the present invention that solves the problems shown in Figure 4. [Figure 6] This figure illustrates the configuration of an embodiment of the present invention that solves the problems shown in Figure 4. [Figure 7] Figures 5 and 6 illustrate the solution to the problem in the embodiment of the present invention shown. [Modes for carrying out the invention]
[0009] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. In this specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions will be omitted.
[0010] Figure 1 is a plan view of a zippered container according to one embodiment of the present invention, and Figure 2 is a cross-sectional view along line II-II in Figure 1. In the illustrated example, the zippered container 1 includes a film 10 that constitutes a bag-shaped container body including a first surface 11A and a second surface 11B facing each other, and a zipper tape 20.
[0011] The film 10 is formed from, for example, a single-layer or multi-layer thermoplastic resin. More specifically, the film 10 may be formed from low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). The PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). If the film 10 is multi-layer, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used as the surface material. These are not limited to resins derived from fossil fuels, but may also be environmentally friendly bioplastics (polyolefin resins such as biopolyethylene and biopolypropylene derived from biomass), or mixtures of fossil fuel-derived resins and bioplastics, or polylactic acid (PLA), polybutylene succinate (PBS), poly(butylene adipate / terephthalate) (PBAT), polycaprolactone (PCL), poly(caprolactone / butylene succinate) (PCLBS), poly(butylene) The film may be a biodegradable resin such as polyethylene succinate / adipate (PBSA), poly(butylene succinate / carbonate) (PEC), poly(ethylene terephthalate / succinate) (PETS), poly(tetramethylene adipate / terephthalate) (PTMAT), polyethylene succinate (PES), polyvinyl alcohol (PVA-H), polyglycolic acid (PGA), and poly(hydroxybutyrate / hydroxyhexanoate) (PHBH), or a mixture thereof. The film 10 may also include a layer of inorganic material formed by aluminum vapor deposition or lamination of aluminum foil.
[0012] In the illustrated example, the film 10 includes two films, each forming a first surface 11A and a second surface 11B. The two films are joined together at a bottom seal portion 12 and a side seal portion 13, thereby creating a storage space between the first surface 11A and the second surface 11B. An opening 14 is formed on one side of the storage space. Alternatively, a top seal portion may be formed at the location of the opening 14, and the opening may be formed by subsequently cutting off the top seal portion. In this case, the top seal portion is the intended opening portion. Note that the side of the opening 14 in the following description may be the intended opening portion side in other embodiments. A gusset may be formed at the bottom of the container where the bottom seal portion 12 is formed, with the film 10 folded towards the storage space. The gusset may be made of a film other than the films forming the first surface 11A and the second surface 11B. A similar gusset may also be formed on the side of the container where the side seal portion 13 is formed. In such cases, the film 10 may include another film in addition to the two films that make up the first surface 11A and the second surface 11B. In the illustrated example, the first surface 11A and the second surface 11B are formed by joining the two films at the bottom seal portion 12 and the side seal portion 13, respectively, but the first surface 11A and the second surface 11B may also be formed by folding the film 10 over at the side portion or the bottom portion of the container. In such cases, one or both of the side seal portions 13, or the bottom seal portion 12, may not be formed.
[0013] The zipper tape 20 is formed, for example, by extrusion molding of a polyolefin resin. More specifically, the zipper tape 20 may be formed from low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). The PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). These may be environmentally friendly bioplastics, or a mixture of fossil fuel-derived resin and biomass plastics such as biopolyethylene may be used. From the viewpoint of increasing the engagement strength of the engagement portion, it is preferable that the first and second portions of the zipper tape 20 be formed from a resin composition mainly composed of polypropylene, but the invention is not limited to this example. Furthermore, the zipper tape 20 may be formed by extrusion molding of biodegradable resins such as polylactic acid (PLA), polybutylene succinate (PBS), poly(butylene adipate / terephthalate) (PBAT), polycaprolactone (PCL), poly(caprolactone / butylene succinate) (PCLBS), poly(butylene succinate / adipate) (PBSA), poly(butylene succinate / carbonate) (PEC), poly(ethylene terephthalate / succinate) (PETS), poly(tetramethylene adipate / terephthalate) (PTMAT), polyethylene succinate (PES), polyvinyl alcohol (PVA-H), polyglycolic acid (PGA), and poly(hydroxybutyrate / hydroxyhexanoate) (PHBH), in consideration of the environment. These may also be biodegradable resins derived from biomass. The material of the zipper tape 20 may optionally contain known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants.
[0014] As shown in FIG. 2, the zipper tape 20 includes a first portion including a base portion 21A and engaging portions 22A1, 22A2, and a second portion including a base portion 21B and engaging portions 22B1, 22B2, 22B3. The engaging portion 22A1 projects from the base portion 21A and is formed in a male shape. The engaging portion 22A2 also projects from the base portion 21A and is formed in a hook shape directed to the opposite side of the engaging portion 22A1. The engaging portions 22B1, 22B2 project from the base portion 21B and are formed in a female shape. The engaging portion 22B3 also projects from the base portion 21B and is formed in a hook shape directed to the side of the engaging portions 22B1, 22B2. When the base portion 21A and the base portion 21B are joined to the first surface 11A and the second surface 11B of the film respectively as shown in the figure, the engaging portion 22A1 formed in a male shape engages with the engaging portions 22B1, 22B2 formed in a female shape, and the engaging portions 22A2, 22B3 formed in a hook shape engage with each other. With such a configuration of the engaging portions 22A1, 22A2, 22B1, 22B2, 22B3, the zipper tape 20 can stably maintain the engagement by the engaging portions and seal between the first portion and the second portion. The zipper tape 20 is arranged such that the engaging portion 22A1 and the engaging portions 22B1, 22B2 are closer to the opening 14 or the planned opening portion than the engaging portion 22A2 or the engaging portion 22B3 along the opening 14 or the planned opening portion of the container body constituted by the film 10, and is attached to the container body by joining the base portions 21A, 21B to the inside of the first surface 11A and the second surface 11B by heat sealing or the like.
[0015] In this embodiment, the base portion 21A (first base) of the first part of the zipper tape 20 is shortened compared to the base portion 21B (second base) of the second part on the opening 14 side relative to the engaging portion 22A1 (first engaging portion), i.e., on the opposite side from the engaging portion 22A2 (second base), or, as shown in Figure 3, is not formed on the opening 14 side relative to the engaging portion 22A1. As a result, the base portion 21A is not joined to the first surface 11A of the film 10 on the opening 14 side of the engaging portion 22A1. In this case, even if a user grasps the first surface 11A and the second surface 11B at the opening 14, it is difficult to apply force in the direction of releasing the engagement of the zipper tape 20, and opening the container 1 with the zipper tape is difficult. If the base 21A is grasped directly from the opening 14 side, a force in the direction of releasing the engagement of the zipper tape 20 can be applied. However, since the base 21A is not formed on the opening 14 side, or is shorter than the base 21B even if it is formed there, it is difficult to grasp. Specifically, for example, even if the base 21A is formed on the opening 14 side, if the extension length t, based on the side surface of the shaft portion of the engaging portion 22A1, is 2.0 mm or less, it is difficult to grasp the base 21A from the opening 14 side. The extension length t may be determined so that when the engaging portion 22A1 and the engaging portions 22B1, 22B2 engage with each other, the side surface of the engaging portion 22B1 on the opening 14 side and the end of the base 21A are aligned. As described above, the base 21A does not have to be formed on the opening 14 side relative to the engaging portion 22A1, so the minimum value of the extension length t is 0.
[0016] With the above-described configuration, in the container 1 with a zipper tape, it becomes difficult to open the zipper tape 20 after it has been sealed once. As a result, for example, it is possible to prevent the contents such as products from being replaced while on display (anti-counterfeiting), and to prevent unintended users from opening the container after purchasing the product or the like (child resistance). In the case of child resistance, for example, in order to enable opening for users who know how to open it, in a partial section in the width direction of the opening 14, that is, in the longitudinal direction of the zipper tape 20, the base portion 21A may not be shortened and may also be formed on the opening 14 side. Further, in order to take out the contents without opening the zipper tape 20, an opening cutable portion may be formed on the side of the zipper tape 20 opposite to the opening 14. In the example shown in FIG. 1, notches 15 are formed in the side seal portions 13 on both sides on the side opposite to the opening 14 with respect to the zipper tape 20, and the portion between the notches 15 on both sides becomes the opening cutable portion 16.
[0017] FIG. 4 is a diagram for explaining a problem that may occur when one base portion of the zipper tape is shortened. What is shown is a comparative example, and the shape of the male engaging portion 22A1P in the zipper tape is different from that of the embodiment of the present invention. When trying to engage the engaging portion with a zipper tape having one base portion shortened, since no force is applied from the side where the one base portion is shortened to the one base portion, the other base portion may be inclined with respect to the one base portion. In this case, if the hook-shaped engaging portions 22A2 and 22B3 engage first, the adjacent male engaging portion 22A1P may be less likely to enter inside the female engaging portions 22B1 and 2, resulting in difficulty in engaging the engaging portion 22A1P with the engaging portions 22B1 and 22B2 in the sealing operation of the container with a zipper tape.
[0018] Figures 5 and 6 are diagrams illustrating the configuration of an embodiment of the present invention that solves the problems shown in Figure 4. In the embodiment of the present invention, the vertex T of the tip portion 72 of the male engaging portion 22A1 (first engaging portion) is eccentric to the engaging portion 22A2 side with respect to the center line CL of the shaft portion 71. Here, within the engaging portion 22A1, the shaft portion 71 is the part that rises up from the base portion 21A, and the tip portion 72 is the part that is formed in a mountain shape at the tip of the shaft portion 71. It is preferable that the vertex T is located between the center line CL of the shaft portion 71 and the extension line SL of the side surface of the shaft portion 71. More specifically, as shown in Figure 6, when the distance from the center line CL of the shaft portion 71 to the extension line SL of the side surface on the engaging portion 22A2 (second engaging portion) side is d1, and the distance from the center line CL to the vertex T is d2, it is preferable that d2 / d1 is 0.1 or more and 1.0 or less. More preferably d2 / d1 is 0.3 or more, and even more preferably 0.5 or more. Furthermore, d2 / d1 is more preferably 0.9 or less, and even more preferably 0.8 or less.
[0019] Figure 7 is a diagram illustrating the solution to the problems in the embodiments of the present invention shown in Figures 5 and 6. In this embodiment, as described above, the vertex T of the tip of the male engaging portion 22A1 is eccentric to the engaging portion 22A2 side with respect to the center line CL of the shaft portion. As a result, the other base of the zipper tape is at an angle to one base, and even if the hook-shaped engaging portions 22A2 and 22B3 engage first, the adjacent male engaging portion 22A1 can easily enter the inside of the female engaging portions 22B1 and 22B2, allowing the male engaging portion 22A1 to be more reliably received inside the female engaging portions 22B1 and 22B2. This makes it possible to smoothly engage the engaging portion 22A1P and the engaging portions 22B1 and 22B2 during the sealing operation of the zipper tape container 1.
[0020] Here, as described above, when the vertex T of the tip portion 72 of the male engagement portion 22A1 is eccentric with respect to the center line CL of the shaft portion 71, the angles of the slopes formed on both sides of the vertex T at the tip portion 72 also change. More specifically, as shown in Figure 6, when the vertex is eccentric, the angle θ that the slope 73 formed on the opening side from the vertex T, i.e., the side opposite to the engagement portion 22A2, makes with the center line CL on the base portion 21A side tends to be gentler than the angle that the opposite slope 74 makes with the center line CL. However, if the angle θ becomes too gentle, the male engagement portion 22A1 will have difficulty entering the inside of the female engagement portions 22B1 and 22B2 as shown in the example in Figure 7, so it is preferable not to make the angle θ too gentle. The angle θ is preferably 60 degrees or less, more preferably 50 degrees or less, and even more preferably 45 degrees or less. Note that, as shown in the illustrated example, the slopes 73 formed on both sides of vertex T may not necessarily be geometric planes but curved surfaces. In that case, the angle θ should be measured with respect to the plane corresponding to the approximate straight line with respect to the curve of the cross-section of the slope 73.
[0021] In addition to the above, the following configurations may be adopted to make it difficult to open the zipper tape 20 after it has been sealed. For example, in the male engaging portion 22A1, the engaging portion 22A2 side of the tip 72 may be folded back toward the base 21A side. The tip of the hook-shaped engaging portion 22A2 (second engaging portion) may be folded back toward the base 21A side, and the tip of the hook-shaped engaging portion 22B3 (fourth engaging portion) may be folded back toward the base 21B side. Also, the tips of a pair of hook-shaped portions included in the female engaging portions 22B1, 22B2 (third engaging portion) may each be folded back toward the base 21B side. By adopting some or all of these configurations, the engagement between the male engagement portion 22A1 and the female engagement portions 22B1 and 22B2, and the engagement between the hook-shaped engagement portions 22A2 and 22B3 can be strengthened, making it more difficult to open the zipper tape 20 once it has been sealed. [Examples]
[0022] Next, embodiments of the present invention will be described. As shown in the table below, the closing strength was measured for an example in which the apex of the tip of the male engaging portion was eccentrically offset toward the hook-shaped engaging portion with respect to the center line of the shaft portion (an example shown in Figure 7, etc.), and an example in which the apex of the tip was not eccentrically offset toward the hook-shaped engaging portion (a comparative example shown in Figure 4). The values for the examples are the average of 8 measurements, and the values for the comparative examples are the average of 4 measurements. In both examples, the base of the male side is not formed beyond the male engaging portion. Closing strength is the force required to engage the engaging portion of the zipper tape. Closing strength was calculated by cutting the zipper tape to a width of 15 mm, placing the bases opposite each other with the engaging portions not engaged, fixing the side of the base of the female side opposite the engaging portion on a stand, applying a compressive force to the side of the base of the male side opposite the engaging portion, and measuring the maximum value of the compressive force applied until the engaging portions engaged using a digital force gauge (model name: ZTS-200N) manufactured by Imada Co., Ltd. When applying compressive force to the base of the male connector, the procedure was performed with the male connector at an angle to the female connector, as shown in Figures 4 and 7. The following table shows the closing strength (N / 15mm) required to engage the hook-shaped, female, and male connectors in each measurement.
[0023] The vertex position in the table represents the degree of eccentricity of the vertex at the tip of the male-type engaging part, as explained above with reference to Figure 6, and corresponds to d2 / d1. The average vertex position in the embodiment was d2 / d1 = 0.5, and the average vertex position in the comparative example was d2 / d1 = -0.22. In the comparative example, d2 was set to a negative value because the vertex at the tip of the male-type engaging part was eccentric in the opposite direction to that of the hook-type engaging part. The slope angle in the table represents the angle θ that the slope formed from the vertex at the tip of the male-type engaging part toward the opening side makes with the center line of the shaft, as explained with reference to Figure 6. The average slope angle in the embodiment was 50 degrees, and the average slope angle in the comparative example was 44 degrees, with the slope angles being approximately the same in each case.
[0024] [Table 1]
[0025] The closing strength shown in the table was improved to about one-third of that of the comparative example in the example. This result indicates that the configuration in the present invention, in which the apex of the tip of the male engaging portion is eccentric to the hook-shaped engaging portion side with respect to the center line of the shaft portion, is effective in smoothly engaging the engaging portion during the sealing operation, even when one of the bases of the zipper tape is shortened. [Explanation of Symbols]
[0026] 1... Container with zipper tape, 10... Film, 11A... First side, 11B... Second side, 12... Bottom seal, 13... Side seal, 14... Opening, 15... Notch, 16... Cuttable opening section, 20... Zipper tape, 21A, 21B... Base, 22A1... Male engaging part, 22A2... Hook-shaped engaging part, 22B1, 22B2... Female engaging part, 22B3... Hook-shaped engaging part, 71... Shaft, 72... Tip, 73, 74... Bevel, CL... Centerline, SL... Extension line, T... Vertex, θ... Angle.
Claims
1. A first portion including a first base, a first engaging portion projecting from the first base and formed in a male shape, and a second engaging portion projecting from the first base and formed in a hook shape facing the opposite side of the first engaging portion, The second portion includes a second base, a third engaging portion that protrudes from the second base and is formed in a female shape that can engage with the first engaging portion, and a fourth engaging portion that protrudes from the second base, is directed toward the third engaging portion and is formed in a hook shape that can engage with the second engaging portion. Equipped with, The first base is shortened compared to the second base on the side opposite to the second engagement portion relative to the first engagement portion, or it is not formed on the side opposite to the second engagement portion relative to the first engagement portion. The zipper tape wherein the first engaging portion includes a shaft portion that rises from the first base portion and a tip portion that is formed in a mountain shape at the tip of the shaft portion, and the apex of the tip portion is eccentric toward the second engaging portion with respect to the center line of the shaft portion.
2. The zipper tape according to claim 1, wherein when d1 is the distance from the center line to the extension line of the side surface of the shaft portion on the second engaging portion side, and d2 is the distance from the center line to the vertex, d2 / d1 is 0.1 or more and 1.0 or less.
3. The zipper tape according to claim 1 or claim 2, wherein, of the slopes formed on both sides of the apex at the tip, the slope formed on the side opposite to the second engaging portion makes an angle θ with the center line on the first base side of the zipper tape according to claim 1 or claim 2.
4. The zipper tape according to any one of claims 1 to 3, wherein the second engaging portion side of the tip is folded back toward the first base side.
5. The tip of the hook-shaped second engaging portion is folded back toward the first base portion. The zipper tape according to any one of claims 1 to 4, wherein the tip of the hook-shaped fourth engaging portion is folded back toward the second base portion.
6. The zipper tape according to any one of claims 1 to 5, wherein the tips of a pair of hook-shaped portions included in the third engaging portion formed in the female mold are each folded back toward the second base portion.
7. The zipper tape according to any one of claims 1 to 6, wherein the first base is also formed on the side opposite to the second engaging portion with respect to the first engaging portion, and the extension length with respect to the side surface of the shaft portion of the first engaging portion is 0 to 2.0 mm.
8. The zipper tape according to any one of claims 1 to 7, wherein the first base is also formed on the side opposite to the second engaging portion relative to the first engaging portion, and when the first engaging portion and the third engaging portion engage with each other, the side of the third engaging portion opposite to the fourth engaging portion and the end of the first base are aligned.
9. A container with a zipper tape, wherein the zipper tape according to any one of claims 1 to 8 is bonded to the inside of the first and second opposing surfaces of the film constituting the container body, A container with a zipper tape, wherein the zipper tape is positioned along the opening or planned opening of the container body such that the first engaging portion and the third engaging portion are closer to the opening or planned opening than the second engaging portion and the fourth engaging portion.
10. A container with a zipper tape according to claim 9, wherein a portion that can be cut for opening is formed on the opposite side of the zipper tape from the opening or the portion intended to be opened.