JP2014104345A - Zipper tape, packaging bag with zipper and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zipper tape easily and securely closed by a user, a packaging bag with a zipper and a method of manufacturing the same.SOLUTION: A zipper tape 50 (51) is fitted to a bag body 11 formed of thermoplastic resin to construct a packaging bag 10 with a zipper. The zipper tape 50 (51) is formed of thermoplastic resin, and includes: a transparent belt-like sheet 52 heat-sealed to the bag body 11; and a first linear tab 13 (a second linear tab 14) disposed on the belt-like sheet 52. The first linear tab 13 (the second linear tab 14) is disposed in a longitudinal direction of the belt-like sheet 52. The first linear tab 13 (the second linear tab 14) includes: a slender base sheet part 17 whose size in a transverse direction is set to 4 mm-14 mm; and a recess line 18 and a projection line 19 whose outer shape can be fitted to the recess line 18, which are extended in the longitudinal direction of the slender base sheet part 17 and disposed opposite to each other in the transverse direction.

Description

  The present invention relates to a zipper tape, a packaging bag with a zipper, and a manufacturing method thereof.

  The zippered packaging bag can be sealed again once opened, and is widely used for food preservation and the like. A general packaging bag with a zipper has a structure in which a concave line and a convex line can be fitted to the inner surface around the opening. Such a packaging bag with a zipper is manufactured by heat-sealing a pair of zipper tapes having ridges or ridges superimposed between two sheets for forming a packaging bag.

  As a packaging bag with a zipper having the structure as described above, for example, one disclosed in Patent Document 1 is known.

JP 2012-158378 A

  The concave stripe and the convex stripe described above are formed so as to protrude from the linear member made of resin. The user presses the linear member along the longitudinal direction from the outside of the packaging bag with a zipper to bring the concave strip and the convex strip into a fitted state, and seals the packaging bag with the zipper. However, since the linear member formed with the concave stripes and the convex stripes is narrow in the past, it is difficult for the user to put the zipper tape into a fitted state, or the packaging bag with the zipper cannot be sufficiently sealed. was there.

  This invention is made | formed in view of the situation mentioned above, It is providing the zipper tape which can be easily and reliably closed by the user, the packaging bag with a zipper, and its manufacturing method.

  (1) The present invention is a zipper tape attached to a joined body made of a thermoplastic resin, which is made of a thermoplastic resin and is heat-sealed with the joined body, and the belt-like sheet. The resinous linear tab is disposed along the longitudinal direction of the strip sheet, and the size of the strip sheet in the short direction is set to 4 mm to 14 mm. A long and narrow base sheet part, a concave line extending in the longitudinal direction of the long and narrow base sheet part and arranged opposite to each other in the lateral direction, and a convex line having an outer shape that can be fitted to the concave line.

  In this configuration, since the linear tab has a concave line and a convex line, pressing the pair of linear tabs in a state where the concave line and the convex line face each other ensures that the concave line and the convex line are secured. Can be fitted. In addition, since the linear tab is as wide as 4 mm to 14 mm, the user can easily fit the concave and convex ridges.

  (2) The concave stripe may have a U-shaped groove, and the convex stripe may be formed with a head that is press-fitted into the U-shaped groove.

  The U-shaped groove and the head can further ensure the fitting between the concave stripe and the convex stripe.

  (3) A packaging bag with a zipper according to the present invention comprises a bag body made of a thermoplastic resin and having an opening formed therein, and a pair of the above zipper tapes arranged to face the peripheral edge of the opening of the bag body. One zipper tape is reversed and arranged so that the above-mentioned ridges and dents face each other with respect to the other zipper tape.

  Such a packaging bag with a zipper is surely sealed because the recesses and the projections are fitted twice.

  (4) The resin linear tabs provided on the pair of zipper tapes may have different colors.

  For example, when one zipper tape is blue and the other zipper tape is yellow, the pair of zipper tapes are brought into close contact with each other due to the fitting between the concave stripes and the convex stripes, and are visually recognized as green as a whole. Therefore, the user can easily confirm that the packaging bag with the zipper is sealed.

  (5) In the method of manufacturing the zipper tape, the first resin constituting the belt-like sheet is injected into the cylindrical first cavity having an open end, and the zipper tape is disposed at a position facing the first cavity. A second resin that constitutes the resin-made linear tab is injected into a second cavity that defines the shape of the resin-made linear tab, and includes an extrusion process in which both are fused and fused.

  By such an extrusion process, the first resin and the second resin can be easily fused.

  (6) The second cavities may be provided at two different locations, and different second resins may be injected into the second cavities.

  By such a method, a pair of said zipper tape used for a packaging bag with a zipper can be manufactured by extrusion once.

  According to the present invention, it is possible to provide a zipper tape that can be easily and reliably closed by a user, and a packaging bag with a zipper.

FIG. 1 is an external perspective view of a packaging bag 10 with a zipper according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is an enlarged view of a region indicated by reference numeral III in FIG. 2 and shows the vicinity of the first linear tab 13 and the second linear tab 14. In particular, (A) shows a state where the concave strip 18 and the convex strip 19 are not fitted, and (B) shows a state where the concave strip 18 and the convex strip 19 are fitted. FIG. 4 is a front view of the zipper tapes 50 and 51 according to the embodiment of the present invention. FIG. 5 is a schematic diagram of the extrusion mold 23 and the extruder 32 used for manufacturing the zipper tapes 50 and 51. FIG. 6 is a view of the extrusion mold 23 observed from above. FIG. 7 is a view of the resin tube body 39 extruded from the extrusion mold 23 as viewed from above. FIG. 8 is a schematic diagram showing a state in which the resin tube 39 is transported in the form of a sheet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The embodiment described below is merely an example in which the present invention is embodied, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.

[Packaging bag with zipper 10]

  A zippered packaging bag 10 shown in FIGS. 1 and 2 includes a bag body 11 in which a sheet made of a transparent thermoplastic resin is processed, and a first linear tab laid on the bag body 11 along an opening 12. 13 and a second linear tab 14. The 1st linear tab 13 and the 2nd linear tab 14 are examples of the resin-made linear tabs in a claim, respectively.

  The bag body 11 has a rectangular shape in which the first sheet portion 15 and the second sheet portion 16 face each other. The first linear tab 13 is fused inside the first sheet portion 15 and extends along the opening 12. The second linear tab 14 is fused to the inside of the second sheet portion 16 and extends along the opening 12. The first linear tab 13 and the second linear tab 14 oppose each other in the thickness direction of the bag body 11. The 1st linear tab 13 and the 2nd linear tab 14 are 4 mm-14 mm in the size of the transversal direction (vertical direction of FIG. 1, FIG. 2) orthogonal to a longitudinal direction.

  The first linear tab 13 and the second linear tab 14 are made of resins colored in different colors. In the present embodiment, the first linear tab 13 is blue and the second linear tab 14 is yellow, but the colors of the first linear tab 13 and the second linear tab 14 are not limited to this. Since the bag body 11 is transparent, the first linear tab 13 and the second linear tab 14 are visible from the outside through the bag body 11.

  The first linear tab 13 and the second linear tab 14 are formed by injection molding of a thermoplastic resin. As shown in FIG. 3A, the first linear tab 13 and the second linear tab 14 have the same shape. Each of the first linear tab 13 and the second linear tab 14 includes an elongated base sheet portion 17, and a recess 18 and a protrusion 19 that protrude from the elongated base sheet portion 17. The concave stripe 18 and the convex stripe 19 are arranged at a predetermined interval in the short direction of the first linear tab 13 and the second linear tab 14 and extend in parallel along the longitudinal direction. A wide head 20 is formed on the protruding tip side of the ridge 19. Further, the recess 18 is formed in a U shape having a U-shaped groove 21 in the center. Claw portions 22 for holding the head 20 in the U-shaped groove 21 are formed on both outer sides of the U-shaped groove 21.

  The first linear tab 13 and the second linear tab 14 are arranged upside down. That is, the ridge 19 of the first linear tab 13 is in a position facing the concave 18 of the second linear tab 14, and the concave 18 of the first linear tab 13 is in the second linear tab 14. It is in a position facing the ridges 19.

  In the state in which the opening 12 is opened, as shown in FIG. 3A, the opposing concave stripes 18 and the convex stripes 19 are in a separated state. After the contents are stored in the packaging bag 10 with the zipper, the user presses the first linear tab 13 and the second linear tab 14 along the longitudinal direction from the outside of the packaging bag 10 with the zipper. Thereby, as shown in Drawing 3 (B), concave line 18 and convex line 19 which counter each fit. That is, the head 20 of the ridge 19 enters the U-shaped groove 21 at the center of the ridge 18. The head 20 of the ridge 19 is held inside the U-shaped groove 21 by a claw portion 22 of the ridge 18 with a certain holding force. Thereby, the opening part 12 is closed and the packaging bag 10 with a zipper is made into a sealing state.

  As described above, the concave stripe 18 and the convex stripe 19 are fitted to each other at two places having different short-side directions. That is, the packaging bag 10 with a zipper is sealed by the double fitting structure. Moreover, at the time of fitting, the blue first linear tab 13 and the yellow second linear tab 14 are in close contact with each other, so that the first linear tab 13 and the second linear tab 14 are attached to the bag body 11. It is visually recognized as green as a whole from the outside.

  Moreover, when taking out the contents of the packaging bag 10 with a zipper, a user pulls apart the 1st sheet | seat part 15 and the 2nd sheet | seat part 16 with the force exceeding said holding force. Accordingly, the claw portion 22 is elastically deformed so as to open outward, and the head portion 20 of the ridge 19 is detached from the U-shaped groove 21 of the ridge 18. That is, the fitting between the concave stripe 18 and the convex stripe 19 is released, and the opening 12 of the zippered packaging bag 10 is opened.

[Zipper tape 50, 51]

  The zippered packaging bag 10 is manufactured by heat-sealing a pair of zipper tapes 50 and 51 shown in FIG. The pair of zipper tapes 50 and 51 are formed by laying the first linear tab 13 or the second linear tab 14 on the belt-like sheet 52. The belt-like sheet 52 is a sheet of a transparent thermoplastic resin, and it is preferable that the same one as the thermoplastic resin constituting the bag body 11 is used.

  The belt-like sheet 52 of the zipper tape 50 is heat sealed to the inner surface of the first sheet portion 15 of the bag body 11. Further, the belt-like sheet 52 of the zipper tape 51 is heat sealed to the inner surface of the second sheet portion 16 of the bag body 11. Thereby, the packaging bag 10 with a zipper mentioned above is manufactured. By integrating the belt-like sheet 52 with the first sheet portion 15 and the second sheet portion 16 respectively, the first linear tab 13 is formed on the first sheet portion 15 and the second sheet portion 16 as shown in FIG. And the 2nd linear tab 14 will be in the state laid directly. In addition, after the strip | belt-shaped sheet | seat 52 is heat-sealed by the 1st sheet | seat part 15 and the 2nd sheet | seat part 16, the 1st sheet | seat part 15 and the 2nd sheet | seat part 16 may be processed into a bag shape. Since the method of heat sealing and the method of manufacturing the bag 11 from a resin sheet are known, detailed description is omitted.

[Method of manufacturing zipper tapes 50 and 51]

  For the manufacture of the zipper tapes 50 and 51, an extrusion die 23 shown in FIGS. 5 and 6 is used. The extrusion mold 23 has an inner member 25 and an outer member 26. The inner member 25 includes a substantially columnar column portion 24 and a plate-like base portion 47 extending in the radial direction from the lower end portion of the column portion 24. The outer member 26 has a cylindrical shape and is disposed on the outer peripheral side of the column part 24 and on the base part 47. A first cavity 27 is defined between the inner member 25 and the outer member 26. The first cavity 27 has a cylindrical shape with an upper end opened. In addition, second cavities 28 and 29 are formed in the column portion 24 of the inner member 25. The second cavities 28 and 29 are the upper ends of the pillars 24 and are provided on the radially outer side, that is, close to the first cavity 27 side. An opening leading to the second cavities 28 and 29 is formed at the upper end of the column part 24. As shown in FIG. 6, the second cavities 28 and 29 are provided along the circumferential direction of the column part 24.

  A disc-shaped closing plate 30 is disposed at the upper end of the column part 24, and the closing plate 30 partially closes the openings leading to the second cavities 28 and 29. Cuts 31 (FIG. 6) are formed at two positions corresponding to the second cavities 28 and 29 in the closing plate 30, and the cuts 31 are formed by the first linear tab 13 and the second linear shape shown in FIG. The shape is similar to the cross-sectional shape of the tab 14. Concave and convex shapes corresponding to the concave stripes 18 and the convex stripes 19 are directed to the central side of the closing plate 30. The thermoplastic resin filled in the second cavities 28 and 29 passes through the cuts 31 and is extruded upward. That is, the cut 31 defines the shape after extrusion of the thermoplastic resin. Details will be described later.

  The extruder 32 shown in FIG. 5 injects a thermoplastic resin into the first cavity 27 and the two second cavities 28 and 29, respectively, and applies pressure for extrusion. The extruder 32 includes a first melting tank 33 that injects a molten thermoplastic resin into the first cavity 27, and two second melting tanks 34 that inject the molten thermoplastic resin into the second cavities 28 and 29, respectively. , 35. The first dissolution tank 33 and the first cavity 27 are communicated with each other by a flow path 36. The second dissolution tank 34 and the second cavity 28 are communicated with each other through a flow path 37. The second dissolution tank 35 and the second cavity 29 are communicated with each other by a flow path 38.

  The first dissolution tank 33 is filled with a transparent thermoplastic resin that becomes the belt-like sheet 52 of the zipper tapes 50 and 51. The second dissolution tanks 34 and 35 are filled with thermoplastic resins that become the first linear tabs 13 and the second linear tabs 14 of the zipper tapes 50 and 51, respectively. These thermoplastic resins are, for example, polyethylene. The thermoplastic resin filled in the second dissolution tank 34 is colored blue corresponding to the first linear tab 13 with a pigment. Similarly, the thermoplastic resin filled in the second dissolution tank 35 is colored yellow corresponding to the second linear tab 14 by the pigment. Here, the thermoplastic resin filled in the first dissolution tank 33 is an example of the first resin in the claims. Moreover, the thermoplastic resin with which the 2nd dissolution tanks 34 and 35 are filled is an example of the 2nd resin in a claim, respectively.

  The extruder 32 injects thermoplastic resin from the first dissolution tank 33 and the second dissolution tanks 34 and 35 into the first cavity 27 and the second cavities 28 and 29. After the first cavity 27 and the second cavities 28 and 29 are filled with the thermoplastic resin, the thermoplastic resin is extruded upward by the pressure from the extruder 32. At this time, the pressure of the extruder 32 is adjusted so that the length of resin extruded from each cavity per unit time is the same. The thermoplastic resin extruded from the first cavity 27 has a cylindrical shape corresponding to the shape of the first cavity 27. The thermoplastic resin extruded from the second cavities 28 and 29 passes through the cuts 31 to form the first linear tab 13 and the second linear tab 14, respectively.

  Since the first cavity 27 and the second cavities 28 and 29 are close to each other in the radial direction, the thermoplastic resins in the first cavity 27 and the second cavities 28 and 29 are extruded while being integrated in a semi-molten state. As a result, the extruded thermoplastic resin becomes a resin tube 39 as shown in FIG. The thermoplastic resin in the first cavity 27 becomes a tubular portion 40. The thermoplastic resin in the second cavities 28 and 29 becomes tab portions 41 and 42 integrated on the inner peripheral side of the tubular portion 40. By passing through the notch 31, the tabs 41 and 42 are formed with the concave stripes 18 and the convex stripes 19, respectively.

  As shown in FIG. 8, a pair of inclined plates 43 and a roller pair 44 are disposed above the extrusion mold 23. The pair of inclined plates 43 are opposed to each other, and are inclined so that the distance between the two becomes narrower upward. The resin tube body 39 is cooled between the extrusion mold 23 and the inclined plate 43, and is then folded into a sheet shape by passing between the two inclined plates 43 facing each other. The sheet-shaped resin tube 39 is sandwiched by a roller pair 44 and conveyed by the roller pair 44 and a plurality of rollers 45 and 46.

  In the process of conveyance, the resin tube body 39 is cut in a short direction and a long direction at predetermined locations, and a plurality of pairs of zipper tapes 50 and 51 shown in FIG. 4 are manufactured. At this time, the tubular portion 40 becomes the belt-like sheet 52 of the zipper tapes 50 and 51. Further, the tab portions 41 and 42 become the first linear tab 13 and the second linear tab 14 of the zipper tapes 50 and 51, respectively. Depending on the position at which the resin tube body 39 is cut, the sizes of the zipper tapes 50 and 51 in the longitudinal direction and the short direction are determined. The sizes of the zipper tapes 50 and 51 are appropriately changed according to the bag body 11.

[Effects of Embodiment]

  According to the above-described embodiment, the first linear tab 13 and the second linear tab 14 are provided with the concave stripes 18 and the convex stripes 19, respectively, so that the zippered packaging bag 10 has a double fitting structure. Sealed by. Thereby, sealing of the packaging bag 10 with a zipper is ensured, and deterioration of the content can be prevented.

  Moreover, the 1st linear tab 13 and the 2nd linear tab 14 are formed in the width | variety of 4 mm-14 mm in the transversal direction. Thereby, it becomes easy for a user to press the 1st linear tab 13 and the 2nd linear tab 14 along a longitudinal direction from the outer side of the packaging bag 10 with a zipper, and the concave strip 18 and the convex strip 19 are made easy. Can be fitted.

  Moreover, since the 1st linear tab 13 and the 2nd linear tab 14 are colored in conspicuous colors, such as blue and yellow, and are visually recognized from the exterior of the bag body 11, a user is the 1st linear tab 13 and the 1st linear tab. The position of the two-line tab 14 can be easily grasped.

  Further, in the state where the concave stripe 18 and the convex stripe 19 are fitted, the first linear tab 13 and the second linear tab 14 are brought into close contact with each other by the first linear tab 13 and the second linear tab 14 being in close contact with each other. Is visually recognized as green, which is a mixed color of blue and yellow. Thereby, the user can easily confirm whether or not the fitting between the concave stripes 18 and the convex stripes 19 has been performed.

  Moreover, since the zipper tape 50 and 51 can be attached to the bag body 11 of various sizes, versatility is high. Furthermore, the zipper tapes 50 and 51 can be easily attached to the bag body 11 by heat sealing.

  Moreover, since the zipper tapes 50 and 51 are manufactured only by cutting the resin tube body 39 extruded from the extrusion mold 23, the manufacture of the zipper tapes 50 and 51 is easy and low in cost. Further, since the resin to be the tubular portion 40 and the resin to be the tab portions 41 and 42 are integrated in a semi-dissolved state, the resin is prevented from being mixed around the boundary. That is, the transparent resin that becomes the tubular portion 40 is eroded by the blue or yellow resin that becomes the tab portions 41 and 42, and the aesthetic appearance is not impaired.

[Modification]

  In the embodiment described above, the sizes of the zipper tapes 50 and 51 are arbitrary, and are appropriately changed according to the bag body 11. Especially the 1st linear tab 13 and the 2nd linear tab 14 should just be 4 mm-14 mm in the size of a transversal direction, and are changed arbitrarily in the range.

  Moreover, the color of the 1st linear tab 13 and the 2nd linear tab 14 is not limited to the thing of embodiment mentioned above, It can be visually recognized from the outside via the bag body 11, and Different colors are acceptable.

  Further, the number of the second cavities 28 and 29 provided in the extrusion mold 23 is not limited to two. For example, more second cavities 28 and 29 are formed along the circumferential direction of the outer member 26. In this case, the resin tube body 39 to be extruded has a larger number of tab portions 41 and 42 formed along the inner periphery of the tubular portion 40. If the resin tube body 39 is cut into the tab portions 41 and 42 along the longitudinal direction after extrusion, more zipper tapes 50 and 51 can be manufactured from one resin tube body 39. Further, the diameter of the resin tube body 39, that is, the diameter of the first cavity 27 is appropriately changed according to the number of the second cavities 28 and 29.

DESCRIPTION OF SYMBOLS 10 ... Packaging bag 11 with a zipper ... Bag body 13 ... 1st linear tab 14 ... 2nd linear tab 17 ... Elongated base sheet part 18 ... Concave 19 ... Projection 20 ... head 21 ... U-shaped groove 27 ... first cavity 28, 29 ... second cavity 50, 51 ... zipper tape 52 ... band-like sheet

Claims (6)

A zipper tape to be attached to a joined body made of a thermoplastic resin,
A transparent belt-like sheet made of a thermoplastic resin and heat-sealed with the joined object,
A resinous linear tab disposed on the belt-like sheet;
The resin linear tab is
An elongated base sheet portion that is arranged along the longitudinal direction of the belt-like sheet, and the size in the short direction of the belt-like sheet is set to 4 mm to 14 mm;
A zipper tape provided with concave ridges extending in the longitudinal direction of the elongated base sheet portion and arranged to face each other in the lateral direction, and convex ridges having an outer shape that can be fitted to the concave ridges. The concave line has a U-shaped groove,
The zipper tape according to claim 1, wherein the ridge is formed with a head that is press-fitted into the U-shaped groove. A bag made of a thermoplastic resin and having an opening formed therein, and a pair of zipper tapes according to claim 1 or 2 disposed opposite to the peripheral edge of the opening of the bag,
One zipper tape is a packaging bag with a zipper arranged so as to be reversed so that the above-mentioned ridges and recesses face each other with respect to the other zipper tape.   The packaging bag with a zipper according to claim 3, wherein the resin linear tabs provided on the pair of zipper tapes have different colors. It is a manufacturing method of the zipper tape according to claim 1 or 2,
A first resin constituting the belt-like sheet is injected into a cylindrical first cavity having an open end, and is disposed at a position facing the first cavity to define the shape of the resin-made linear tab. A method for producing a zipper tape, comprising: an extruding step in which a second resin constituting the resin-made linear tab is injected into a second cavity, and both are fused while being fused.   The method for manufacturing a zipper tape according to claim 5, wherein the second cavities are provided at two different locations, and different colors of the second resin are injected into the respective second cavities.

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