JP2011121615A - Zipper tape, and packaging bag with zipper tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a zipper tape which can be easily opened and to provide a packaging bag with the zipper tape. <P>SOLUTION: A rib 47 is provided at the cut section 44 of the zipper tape, the rib having approximately the same thickness dimension (D) as thickness dimensions (D2) of first and second thick-walled sections 45A, 45B, and thereby, when the zipper tape is bonded to a bag body, the first and second thick-walled sections 45A, 45B, and the rib 47 can be bonded to an inner surface 211A. Accordingly, when a packaging bag 1 is torn and unsealed, stress is converged on a thin part 46 which has small tensile strength, and at the thin part 46, cutting can be performed, thus requiring only one portion in cut potions, and generating no waste. When the bag 1 is torn, the rib 47 determines the position of a cut line, so that the cut line is not meandered, linear cutting performance is obtained, and the tape can easily be torn. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a zipper tape and a packaging bag with a zipper tape.

As a packaging material for packaging various items such as foods, medicines, medical products, miscellaneous goods, etc., a pair of belt-like zipper tapes that engage the male and female with respect to the opening of the bag body are arranged, and the occlusion state can be freely opened and closed. A packaging bag with zipper tape (hereinafter sometimes abbreviated as “packaging bag”) is applied.
Such a packaging bag is sealed by sealing an opening. When opening the packaging bag, the sealing portion can be removed so as to tear the base film of the bag body from a notch or notch formed in the edge of the packaging bag.
In recent years, a packaging bag that anyone can easily open has been developed, and a packaging bag that can easily tear a base film and is excellent in easy opening (see, for example, Patent Documents 1 and 2). ).

The fitting described in Patent Document 1 includes a resin layer having an easy-cutting function with a predetermined width that extends along the entire length of the tape portion bonded to the bag body. For this resin layer, a resin different from the tape portion is used.
The zipper tape described in Patent Document 2 includes a cut portion at one edge in the width direction of the male member and the female member. This cut part has a thin part thinner than the first thick part and the second thick part between the first thick part and the second thick part. With this configuration, the thin-walled portion is torn at the time of opening, and a sufficient gripping portion of the bag body for releasing the zipper tape can be secured.

Japanese Patent Laid-Open No. 2004-244027 WO2008 / 035494A1

However, since the resin layer having the easy-cutting function as in Patent Document 1 has a predetermined width dimension, the cut region is wide. Therefore, depending on how to apply a force when tearing the resin layer, the cut line may meander and cannot be easily torn. In addition, when the resin layer is torn, it may be torn at two locations on both ends in the width direction of the resin layer. In that case, the resin layer becomes a fibrous or string-like cut residue, and the appearance is deteriorated or cut. There is a possibility that inconveniences such as debris hindering occlusion and a sufficient seal cannot be obtained.
Similarly, the thin-walled portion of Patent Document 2 has a predetermined width dimension, so that the cut line may meander or may be torn at a plurality of locations to generate scraps.

  The objective of this invention is providing the zipper tape which can be opened easily, and a packaging bag with a zipper tape.

(1) The zipper tape of the present invention is a zipper tape in which a male member and a female member that can be engaged with each other are provided on a pair of band-shaped bases, and at least one end of the pair of band-shaped bases, A pair of thick parts thicker than the thickness dimension of the band-shaped base part, a thin part provided between these thick parts and thinner than the thickness part of the thick part, and formed so as to protrude from the thin part. A cut portion having a rib having a thickness dimension substantially the same as the thickness of the meat portion is provided.

(2) Further, the thickness dimension (D) of the rib is the sum of the height dimension (H1) protruding from the thin part of the rib and the thickness dimension (D1) of the thin part, It is preferable that the ratio ((D) / (D2)) of the thickness dimension (D) and the thickness dimension (D2) of the thick part is 0.8 or more and 1.2 or less.
(3) The ratio ((D2) / (D1)) of the thickness dimension (D2) of the thick part to the thickness dimension (D1) of the thin part is preferably 3 or more and 12 or less. .
(4) Moreover, it is preferable to have the contact bonding layer on one surface of the said strip | belt-shaped base part, a pair of said thick part, and the said rib.
(5) Furthermore, it is preferable that the adhesive layer is a polyolefin-based resin having a melting point lower than that of the resin used for the band-shaped base portion and the cut portion.

(6) The zipper tape according to any one of (1) to (5), wherein the packaging bag with a zipper tape of the present invention is provided on the inner surface of the opening of the bag body having an opening capable of enclosing the inclusion. Is arranged in a state where the belt-like base, the thick part, and one surface of the rib are bonded.

  According to the zipper tape of the present invention, since the zipper tape has the rib having substantially the same thickness as the thick portion, when the zipper tape is bonded to the bag body, the thick portion and the rib are bonded to the inner surface of the bag body. be able to. Therefore, when tearing and opening the packaging bag with a zipper tape, it is cut at a thin portion having a tensile strength smaller than that of the thick portion and the rib, so that the cut portion becomes one place and no cutting residue is generated. Moreover, since the cut line is positioned by the rib, the cut line does not meander and can be easily and easily torn.

The front view which shows the packaging bag with a zipper tape of embodiment which concerns on this invention. II-II sectional drawing of FIG. Sectional drawing which expands and shows the cut part of the said packaging bag with a zipper tape. Sectional drawing which shows the state by which the said packaging bag with a zipper tape is torn. Sectional drawing which shows the packaging bag with a zipper tape of other embodiment. Sectional drawing which shows the packaging bag with a zipper tape which concerns on the comparative example 1. FIG. Sectional drawing which shows the packaging bag with a zipper tape which concerns on the comparative example 2. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Configuration of packaging bag with zipper tape]
FIG. 1 is a front view showing a packaging bag with a zipper tape 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 cross-sectional view of the cut portion of the packaging bag with a zipper tape.

As shown in FIGS. 1 and 2, a packaging bag 1 with a zipper tape of the present embodiment (hereinafter sometimes abbreviated as “packaging bag 1”) is bonded to a bag body 2 and an inner surface 211 </ b> A of the bag body 2. Zipper tape 3.
The bag body 2 is formed by overlapping a base film 21 serving as a packaging material, and includes a side seal portion 22 and a top seal portion 23 on the periphery thereof. The top seal portion 23 is formed by sealing the opening 24 into which the filled material of the bag body 2 is charged.
The side seal portion 22 is formed with a V-shaped notch 25 as a tear start portion at an end portion on the top seal portion 23 side.

The base film 21 is not limited to a single-layer film, and may be a laminated film having a structure in which a sealant layer 211 is laminated on a base material layer 212. Between the base material layer 212 and the sealant layer 211, depending on required performance. In addition, a laminated film layer having a structure in which a gas barrier layer, a light shielding layer, a strength improving layer and the like are laminated as an intermediate layer may be used.
For the base material layer 212, a biaxially stretched polypropylene film (OPP film), a biaxially stretched polyethylene terephthalate film (PET film), a biaxially stretched polyester film, a biaxially stretched polyamide film, or the like can be suitably used. However, various engineering plastic films can be used as required.
For the sealant layer 211, low density polyethylene, polypropylene (CPP), or the like can be used.

The zipper tape 3 is bonded to the inner surface 211 </ b> A of the opening 24 from one side seal part 22 to the other side seal part 22.
The zipper tape 3 includes a female band-shaped base 40 having a female member, a cut portion 44 connected to an end of the female side band-shaped base 40 on the opening 24 side, a male side band-shaped base 50 having a male member, A cut portion 54 connected to an end portion of the side band-shaped base portion 50 on the opening 24 side is provided.

The female side band-shaped base 40 includes a band-shaped base body 41 and a first hook section 42 and a second hook section 43 as female members integrally connected to the band-shaped base body 41. The first hook portion 42 and the second hook portion 43 face each other.
The 1st hook part 42 and the 2nd hook part 43 are engaged with the head 53 so that engagement / disengagement is possible, and the occlusion part 6 is comprised.
The female side belt-like base 40 has a bag side surface 40A facing the inner surface 211A, and a seal layer 40B as an adhesive layer for bonding the bag side surface 40A to the inner surface 211A is laminated on the bag side surface 40A. .

As shown in FIGS. 2 and 3, the cut portion 44 includes a first thick portion 45 </ b> A, a thin portion 46, a rib 47, and a second thick wall in a series from the occlusal portion 6 toward the opening 24. Part 45B.
The first thick part 45A is disposed on the occlusion part 6 side, and the second thick part 45B is disposed on the opening part 24 side.

The pair of first and second thick portions 45 </ b> A and 45 </ b> B are larger than the thickness of the strip-shaped base body 41 and are formed thick. The first and second thick portions 45 </ b> A and 45 </ b> B are provided in a longitudinal shape along the longitudinal direction of the strip-shaped base body 41.
The first thick portion 45A includes a first bag side surface 45A1 that faces the inner surface 211A, and a first inner side surface 45A2 that is the surface opposite to the first bag side surface 45A1 and faces the male side belt-like base portion 50. Have On the first bag side surface 45A1, a seal layer 45A3 for adhering the first bag side surface 45A1 to the inner surface 211A is laminated. The seal layer 45A3 is formed continuously and integrally with the seal layer 40B.
The second thick wall portion 45B is also a second bag side surface 45B1 that faces the inner surface 211A, and a second inner side surface that is the surface opposite to the second bag side surface 45B1 and faces the male belt-like base portion 50. 45B2. A seal layer 45B3 for adhering the second bag side surface 45B1 to the inner surface 211A is laminated on the second bag side surface 45B1.
The first and second thick portions 45A and 45B have a thickness dimension (D2).

The thin portion 46 is disposed in a longitudinal shape between the pair of first and second thick portions 45 </ b> A and 45 </ b> B, and both ends in the longitudinal direction are disposed at positions corresponding to the notches 25.
Moreover, the thin part 46 has the bag side thin surface 461 which opposes the inner surface 211A, and the inner side thin surface 462 which is a surface on the opposite side to the bag side thin surface 461. The bag-side thin surface 461 is disposed at a position retracted toward the inner side of the bag body 2 in the thickness direction with respect to the first and second bag side surfaces 45A1 and 45B1. That is, the bag-side thin surface 461 of the thin-walled portion 46 is provided in a stepped manner with respect to the first and second bag side surfaces 45A1 and 45B1, and has a predetermined interval with respect to the inner surface 211A. It is not glued.
Further, the inner thin surface 462 is also disposed at a position retracted toward the inner surface 211A in the thickness direction with respect to the first inner surface 45A2 and the second inner surface 45B2. That is, the inner thin surface 462 of the thin portion 46 is provided in a step shape with respect to the first inner side surface 45A2 and the second inner side surface 45B2.

The thin-walled portion 46 is connected substantially linearly via a rib 47 to the approximate center in the thickness direction of the first thick-walled portion 45A and the approximate center in the thickness direction of the second thick-walled portion 45B. . Further, the thin portion 46 is formed thinner than the belt-like base body 41 and the first and second thick portions 45A and 45B. And it is preferable that the thickness dimension (D1) of the thin part 46 is 50 micrometers or more, More preferably, it is 60 micrometers or more.
Here, when the thickness dimension (D1) of the thin-walled portion 46 is less than 50 μm, the thin-walled portion 46 may be bent when the zipper tape 3 is bonded to the inner surface 211A. In this case, the rib 47 is sufficiently formed on the inner surface 211A. There is a possibility that it is not bonded and cannot be cut linearly.

And it is preferable that the thin part 46 is 0.5 mm or more and 5 mm or less in width dimension, and a more preferable range is 1 mm or more and 3 mm or less. When the width dimension of the thin part 46 is less than 0.5 mm, it may be difficult to form the rib 47. On the other hand, when the thin portion 46 exceeds 5 mm, the cut line C may not be guided along the rib 47.
The ratio ((D2) / (D1)) between the thickness dimension (D2) of the first and second thick parts 45A and 45B and the thickness dimension (D1) of the thin part 46 is 3 or more and 12 Or less, more preferably 5 or more and 10 or less.
Here, when the ratio ((D2) / (D1)) is smaller than 3, the thin portion 46 may adhere to the inner surface 211A.
On the other hand, when the ratio ((D2) / (D1)) is larger than 12, the thin-walled portion 46 is likely to be bent, and the above-described problem may occur.

The rib 47 includes a plurality of bag-side ribs 471 that protrude from the bag-side thin surface 461, a plurality of inner ribs 472 that protrude from the inner thin-wall surface 462, and a thin-wall between the bag-side rib 471 and the inner rib 472. Part 46. Three of these bag-side ribs 471 and three inner ribs 472 are formed.
The bag-side rib 471 and the inner rib 472 are provided at substantially the same position in the width direction of the thin portion 46.
The bag-side rib 471 has a bag-side rib surface 471A facing the inner surface 211A, and a seal layer 473 for bonding the bag-side rib surface 471A to the inner surface 211A is laminated on the bag-side rib surface 471A.
The inner rib 472 has an inner rib surface 472 </ b> A that faces the male belt-like base 50. The bag-side rib 471 and the inner rib 472 are formed integrally with the thin portion 46, and are formed in a longitudinal shape along the longitudinal direction of the first and second thick portions 45A and 45B.

The rib 47 has substantially the same thickness dimension (D) as the first and second thick portions 45A and 45B, and the thickness dimension (D) is the height dimension (H11) of the bag-side rib 471. , The sum of the height dimension (H12) of the inner rib 472 and the thickness dimension (D1) of the thin portion 46. The ratio ((D) / (D2)) between the thickness dimension (D) of the rib 47 and the thickness dimension (D2) of the first or second thick portion 45A, 45B is 0.8 or more. It is preferably 1.2 or less, more preferably 1.
Here, when the ratio ((D) / (D2)) is greater than 1.2, it is difficult to bond the first and second thick portions 45A and 45B to the inner surface 211A. On the other hand, when the ratio ((D) / (D2)) is smaller than 0.8, it is difficult to bond the bag-side rib 471 to the inner surface 211A.
The thickness dimension (D) of the rib 47 is preferably 200 μm or more and 700 μm or less, and more preferably 300 μm or more and 600 μm or less.
Here, when the thickness dimension (D) of the rib 47 is smaller than 200 μm, the thin portion 46 may adhere to the inner surface 211A, and may not be easily opened.

The male side belt-like base 50 has a belt-like base main body 51 and a head 53 as a male member whose section is connected to the belt-like base main body 51 via a connecting portion 52 and has a substantially saddle shape. The male side belt-like base 50 includes a belt-like base body 51 and a cut portion 54 similar to the cut portion 44 of the female side belt-like base 40 at the end of the band-like base body 51 on the opening 24 side. The cut portion 54 corresponds to the pair of first and second thick portions 45A and 45B, the thin portion 46, the rib 47, the bag side rib 471, and the inner rib 472 of the cut portion 44. Thick wall portions 55A and 55B, thin wall portion 56, rib 57, bag side rib 571 and inner rib 572.
The bag-side rib 571 and the inner rib 572 of the cut portion 54 have a bag-side rib surface 571A and an inner rib surface 572A corresponding to the bag-side rib surface 471A and the inner rib surface 472A of the cut portion 44.
The male side belt-like base portion 50 has a bag side surface 50A and first and second bag side surfaces 55A1 and 55B1 corresponding to the bag side surface 40A and the first and second bag side surfaces 45A1 and 45B1.
The bag side surface 50A, the first and second bag side surfaces 55A1, 55B1, and the bag side rib surface 571A have seal layers 50B, 55A3, 573, 55B3 corresponding to the seal layers 40B, 45A3, 473, 45B3. Are stacked.

The resin used for the female side strip base 40, the cut portion 44, the male side strip base 50, and the cut portion 54 is a crystalline polyolefin resin. Examples of such a crystalline polyolefin resin include low density polyethylene (LD), linear low density polyethylene (LL), and polypropylene (PP), and a mixture of these resins may be used.
The resin used for the seal layers 40B, 45A3, 473, and 45B3 is preferably a polyolefin resin. The polyolefin resin preferably has a lower melting point than the crystalline polyolefin resin used for the female side band-shaped base portion 40 and the cut portion 44. The resin used for the seal layers 50B, 55A3, 573, 55B3 is also preferably a polyolefin-based resin, and has a lower melting point than the crystalline polyolefin-based resin used for the male side band-shaped base 50 and the cut portion 54. preferable.

[Manufacture of zipper tape and packaging bags with zipper tape]
In order to manufacture the zipper tape 3, it can be obtained by a co-extrusion method. If it shape | molds by a coextrusion method, a manufacturing process can be simplified, manufacturing cost can be lowered | hung, and the zipper tape 3 can be manufactured continuously stably.

And the packaging bag 1 is manufactured using the base film 21 and the zipper tape 3, using a zipper tape attaching three-way seal bag making machine.
The zipper tape-attached three-side seal bag making machine positions the zipper tape 3 sent out from the tape sending unit between, for example, the base film 21 sent out from the packaging material sending unit. And the base film 21, the female side strip | belt-shaped base 40, the cut part 44, the male side strip | belt-shaped base 50, and the cut part 54 are mutually pressed with a pair of seal bar, and the zipper tape 3 and the base film 21 are adhere | attached.
And the base film 21 conveyed is heat-bonded at a predetermined interval with respect to the transport direction of the base film 21 to form the side seal portion 22, and then cut on the side seal portion 22 to be a packaging bag. 1 is formed.
In addition, when forming the side seal part 22 of the packaging bag 1, the point seal process for crushing the zipper tape 3 is implemented.

[Opening the packaging bag with zipper tape]
Next, a method for opening the packaging bag 1 of the present embodiment will be described.
FIG. 4 is a cross-sectional view showing a state where the packaging bag with zipper tape is torn.
When opening, the base material film 21 on the opening 24 side of the notch 25 and the base material film 21 on the enclosure side are gripped, and the notch 25 is opened as a tear start part so as to tear back and forth. Here, since the rib 47 is bonded to the inner surface 211A, stress concentrates on the thin portions 46, 56 having a low tensile strength, and the thin portions 46, 56 where the stress is concentrated are cut. Therefore, since the thin portions 46 and 56 where the stress is concentrated are cut, they are cut only at one place. That is, there is only one cut line C (dashed line). And since it positions by the ribs 47 and 57, the cut line C becomes linear and does not meander.
Thereafter, the packaging bag 1 can be opened by releasing the occlusal portion 6 of the zipper tape 3. In the case of resealing, the first hook portion 42 and the second hook portion 43 and the head portion 53 are engaged with each other, and the occlusal portion 6 is brought into an occlusal state.

(Effect of embodiment)
According to the zipper tape 3 and the packaging bag 1 as described above, the following effects can be obtained.
Since the rib 47 having a thickness dimension (D) substantially the same as the thickness dimension (D2) of the first and second thick parts 45A and 45B is provided in the cut part 44 of the zipper tape 3, the zipper tape 3 is When bonding to the bag body 2, the first and second thick portions 45A and 45B and the rib 47 can be bonded to the inner surface 211A. Therefore, when the packaging bag 1 is torn and opened, stress concentrates on the thin portion 46 having a small tensile strength, and the thin portion 46 can be cut. Accordingly, there is only one cutting point and no cutting residue is generated.
Further, since the cut line C is positioned by the rib 47 when the packaging bag 1 is torn, the straight line cutting property can be obtained without causing the cut line to meander and can be easily torn.

  Further, since the inner rib 472 is provided on the opposite side to the bag side rib 471 so as to sandwich the thin portion 46, the thin portion 46 can be cut reliably. That is, it is not cut on the bag-side rib 471 or the inner rib 472.

  Further, since the thin portion 46 is disposed at a position retracted from the first and second bag side surfaces 45A1 and 45B1, the thin portion 46 is not bonded to the inner surface 211A, and the thin portions 46 and 56 can be easily cut. Can do.

The ratio (D) / (D2) between the thickness dimension (D) of the rib 47 and the thickness dimension (D2) of the first and second thick portions 45A and 45B is 0.8 or more. Since it is set to 2 or less, the bag-side rib 471 and the first and second thick portions 45A and 45B can be favorably bonded to the inner surface 211A.
Further, since the ratio of the thickness dimension (D) of the rib 47 and the thickness dimension (D2) of the first and second thick portions 45A and 45B is within the above range, the thin portion 46 is formed on the inner surface 211A during bag making. Adhesion can be prevented. In addition, it is possible to prevent pinholes and the like from occurring in the crushed portion in the point sealing process during bag making.

  Further, the ratio ((D2) / (D1)) between the thickness dimension (D2) of the first and second thick portions 45A and 45B and the thickness dimension (D1) of the thin portion 46 is 3 or more and 12 or less. Therefore, the thin portion 46 can be prevented from adhering to the inner surface 211A, and the thin portion 46 can be prevented from being bent.

  Furthermore, since the thickness dimension (D1) of the thin portion 46 is 50 μm or more, the thin portion 46 can be prevented from being bent when the zipper tape 3 is bonded to the inner surface 211A. Therefore, the bag-side rib 471 can be favorably bonded to the inner surface 211A. Therefore, when tearing the packaging bag 1, it is excellent in linear cut property.

  Further, as the resin used for the seal layers 40B, 45A3, 45B3, 473, a polyolefin resin having a melting point lower than that of the resin used for the female band-like base portion 40 and the cut portion 44 is used. The zipper tape 3 can be adhered to the surface. Therefore, deterioration of the base material layer 212 which comprises the base material film 21 of the bag body 2 can be suppressed.

  The resin used for the female side strip base 40 is a crystalline polyolefin-based resin. Since this crystalline polyolefin-based resin is a specific resin such as polypropylene, the rib 47 can be easily formed.

Since the zipper tape 3 is provided in the bag body 2, it can be set as the packaging bag 1 which is excellent in linear cut property and can be easily torn without generating cutting waste.
It should be noted that the cut portion 54 of the male side strip base 50 of the zipper tape 3 has the same effect as the cut portion 44.

(Modification)
It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that modifications and improvements within the scope that can achieve the objects and effects of the present invention are included in the content of the present invention. Nor. Further, the specific structure, shape, and the like in carrying out the present invention are not problematic as other structures, shapes, and the like as long as the objects and effects of the present invention can be achieved.
FIG. 5 is a cross-sectional view showing a packaging bag with a zipper tape according to another embodiment.

  For example, in the present embodiment, the thin-walled portion 46 is configured to connect the first and second thick-walled portions 45A and 45B in a substantially straight line. However, as shown in FIG. May be provided. For example, one end portion of the thin portion 46C connected to the first thick portion 45A is disposed on the inner surface 211A side, and the other end portion of the thin portion 46C connected to the second thick portion 45B is connected to the bag body 2. You may make it arrange | position to the inner side, ie, the male side strip | belt-shaped base part 50 side.

Moreover, although the female side strip | belt-shaped base 40 showed the structure adhere | attached on the inner surface 211A via the sealing layer 40B, the female side strip | belt-shaped base 40 may be directly adhere | attached on the inner surface 211A.
Even when the packaging bag 1 having such a configuration is cut, the rib 47 is bonded to the inner surface 211A, so that stress concentrates on the thin portion 46 having a small tensile strength and can be cut at the thin portion 46. .

And although the structure which provides the bag side rib 471 and the inner side rib 472 in the thin part 46 was shown, only the bag side rib 471 is provided without providing the inner side rib 472 in the thin part 46, and the thin part 46 is a male side strip | belt-shaped base part. It may be arranged on the 50 side. That is, the inner thin surface 462 does not recede toward the inner surface 211A with respect to the first inner surface 45A2 and the second inner surface 45B2, and the inner thin surface 462 becomes the first inner surface 45A2 and the second inner surface 45B2. The thin-walled portion 46 may be provided so as to be disposed on substantially the same plane.
2 and 3 show a configuration in which three bag-side ribs 471 and three inner ribs 472 are provided in the thin portion 46, but one or more bag-side ribs 471 and inner ribs 472 may be provided.
In addition, although three bag-side ribs 471 and three inner ribs 472 are provided, the number of bag-side ribs 471 and the number of inner ribs 472 may be different.
Furthermore, although the cut part 44 was provided in the female side belt-like base 40 and the cut part 54 was provided also in the male side belt-like base 50, the cut was made only on either the female side belt-like base part 40 or the male side belt-like base part 50. The part 44 or the cut part 54 may be provided.

EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to the content, such as an Example, at all.
6 is a cross-sectional view showing a zipper tape according to Comparative Example 1, and FIG. 7 is a cross-sectional view showing a zipper tape according to Comparative Example 2.

Example 1
The zipper tape according to Example 1 was extruded by a commercially available extruder using the following constituent materials. Using the obtained zipper tape and the base film, a packaging bag of Example 1 as shown in FIG. 2 was produced using a zipper tape-attached three-side seal bag making machine. In addition, as a base film, a 12 micrometer polyethylene terephthalate film and linear low density polyethylene (LLDPE) are laminated | stacked.

(Constituent material of Example 1)
Male side strip base and female side strip base: random polypropylene (density 900 kg / m ³ , ethylene content 4%)
Sealing layer: metallocene linear low density polyethylene resin (melting point: 95 ° C., MFR: 3 g / 10 min)
The melting point was measured by DSC, and the highest melting peak was taken as the melting point.

  As shown in Table 1, the zipper tape manufactured under the above conditions has a rib thickness dimension (D) and a thick part thickness dimension (D2) of 300 μm, and a thin part thickness dimension (D1). ) Is 60 μm. Moreover, the thin part is not adhere | attached on the inner surface of a bag.

(Example 2)
A zipper tape and a packaging bag were obtained in the same manner as in Example 1 except that the constituent materials of the zipper tape of Example 2 were as follows.

(Constituent material of Example 2)
Male side strip base and female side strip base: linear low density polyethylene resin (LLDPE) (density 913 kg / m ³ , MFR: 4 g / 10 min)
Seal layer: metallocene linear low density polyethylene resin (melting point: 95 ° C., MFR: 3 g / 10 min)

(Comparative Example 1)
A zipper tape and a packaging bag according to Comparative Example 1 were obtained in the same manner as in Example 1 except that the following constituent materials were used. As shown in FIG. 6, the zipper tape 9A of Comparative Example 1 was bonded to the inner surface 211A of the bag body 2 on the female side strip base 91A having the female member 91A1 and the male side strip base 92A having the male member 92A1, respectively. A cut portion 93A is provided.

(Constituent material of Comparative Example 1)
Female side strip base 91A and male side strip base 92A: linear low density polyethylene resin (LLDPE) resin (density 916 kg / m ³ , MFR: 8.5 g / 10 min)
Cut part 93A: crystalline polyolefin resin (density 916 kg / m ³ , MFR: 8.5 g / 10 min) 80% by mass and cyclic polyolefin (MFR: 30 g / 10 min) 20% by mass

(Comparative Example 2)
A zipper tape and a packaging bag according to Comparative Example 2 as shown in FIG. 7 were obtained in the same manner as in Example 1 except that no rib was formed. The zipper tape 9B of Comparative Example 2 includes a female side belt-like base portion 91B having a female member 91B1 bonded through a seal layer 93B and a male side belt-like base portion 92B having a male member 92B1. And the female side strip | belt-shaped base part 91B and the male side strip | belt-shaped base part 92B have the thin part 95 which connects a pair of thick part 94A, 94B.
(Comparative Example 3)
A zipper tape and a packaging bag of Comparative Example 3 were obtained in the same manner as in Example 1 except that the thickness dimension (D2) of the thin part was 40 μm.

(Comparative Example 4)
A zipper tape and a packaging bag of Comparative Example 4 were obtained in the same manner as in Example 1 except that the thickness dimension (D) of the rib was set to 100 μm.
(Comparative Example 5)
A zipper tape and a packaging bag of Comparative Example 5 were obtained in the same manner as in Example 1 except that the thickness dimension (D) of the rib was set to 800 μm.

  For the zipper tapes and packaging bags of Examples 1 and 2 and Comparative Examples 1 to 5, the appearance test, the unsealing test, the straight cut test, the pinhole test, the thin-wall adhesion experiment, and the thin-wall folding are as follows. A song experiment was conducted.

(Appearance experiment)
A notch was made in the edge of the packaging bag, the packaging bag was torn from the notch, and evaluated according to the following evaluation criteria. The results are shown in Table 2.
(Evaluation criteria for appearance test)
○: The cut part always cuts at one place.
X: The cut part is cut at two or more places, resulting in cut residue.

(Openability experiment)
A notch was made at the edge of the packaging bag, and the breaking strength until the breaking speed reached 60 mm was measured with a digital force gauge (manufactured by Imada Co., Ltd.). The measurement results were evaluated according to the following evaluation criteria. The results are shown in Table 2.
(Evaluation criteria for openability experiments)
○: Can be easily opened without resistance (breaking strength: 5 N / 60 mm or less).
X: High resistance and difficult to open (breaking strength: 5 N / 60 mm or more).

(Straight line cutting experiment)
A notch was made at the edge of the packaging bag, and the packaging bag was torn from the notch. At this time, the deviation of the fracture position from the notch position was measured and evaluated according to the following evaluation criteria. The results are shown in Table 2.
(Evaluation criteria for straight-line cutting experiment)
○: The zipper tape can be cut completely linearly at the time of cutting (displacement of breakage position: less than 1 mm).
(Triangle | delta): A zipper tape can be cut | disconnected in a straight line at the time of a cutting | disconnection (displacement | rupture position: 1 mm or more and less than 3 mm).
X: The zipper tape cannot be cut in a straight line at the time of cutting (displacement of breakage position: 3 mm or more).

The packaging bags were examined for pinholes and evaluated according to the following evaluation criteria. The results are shown in Table 2.
(Pinhole evaluation criteria)
○: No pinhole is generated.
×: Pinholes are generated.

About the packaging bag, it was investigated whether the thin part adhere | attached on the inner surface of the bag body, and the following evaluation criteria evaluated. The results are shown in Table 2.
(Evaluation criteria for adhesion of thin parts)
○: The thin-walled portion does not adhere to the inner surface of the bag body.
X: A thin part adhere | attaches on the inner surface of a bag.

About a zipper tape, it was investigated whether the thin part bent or not, and the following evaluation criteria evaluated. The results are shown in Table 2.
(Evaluation criteria for folding of thin-walled parts)
○: The thin portion is not bent.
X: A thin part bends.

From the above experiments, it was found that in the packaging bags with zipper tape of Examples 1 and 2, the cut part was always cut only at one place, so that no cut residue was generated and the appearance was good. Moreover, in the packaging bag with a zipper tape of Example 1, 2, it turned out that it is excellent in a feeling of opening and linear cut property, and there is no pinhole, adhesion | attachment of a thin part, and thin part breakage.
On the other hand, in the packaging bags of Comparative Examples 1 and 2, it was found that cut residue was generated and the appearance was poor.
Moreover, in the comparative example 3, since the thickness dimension of the thin part was made thin with 40 micrometers, it turned out that a thin part bends and it becomes difficult to adhere a rib to a base film. In Comparative Example 4, since the rib was made as thin as 100 μm, it was found that the thin portion was adhered at the time of bag making. In Comparative Example 5, since the rib was made as thick as 800 μm, it was found that a pinhole was generated when the side seal portion was formed. That is, it was found that the thickness dimension (D1) of the thin portion of the zipper tape of the present invention is desirably about 60 μm, and the thickness dimension (D) of the rib is desirably about 300 μm.

  INDUSTRIAL APPLICABILITY The present invention can be widely used for, for example, a zipper tape and a packaging bag with a zipper tape for packaging various articles such as foods, medicines, medical products, and miscellaneous goods.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag with a zipper tape 2 ... Bag body 3 ... Zipper tape 40 ... Female side strip | belt-shaped base 40B, 45A3, 473, 45B3 ... Seal layer 44, 54 as an adhesive layer ... Cut part 50 ... Male side strip | belt-shaped base 50B, 55A3 , 573, 55B3... Seal layers 45A, 55A as adhesive layers. First thick portions 45B, 55B. Second thick portions 46, 56. Thin portions 47. Ribs 471, 571. Bag side ribs 472, 572. ... Inner rib

Claims (6)

A zipper tape in which a male member and a female member that can be engaged with each other are provided on a pair of band-shaped bases,
At least one end of the pair of strip-shaped bases, a pair of thick portions thicker than the thickness of the strip-shaped base, and the thickness of the thick portions provided between the thick portions A zipper tape comprising: a thin thin portion; and a cut portion protruding from the thin portion and having a rib having a thickness dimension substantially the same as the thickness of the thick portion. The thickness dimension (D) of the rib is the sum of the height dimension (H1) protruding from the thin part of the rib and the thickness dimension (D1) of the thin part,
A ratio ((D) / (D2)) of a thickness dimension (D) of the rib and a thickness dimension (D2) of the thick portion is 0.8 or more and 1.2 or less. The zipper tape according to claim 1.   The ratio ((D2) / (D1)) of the thickness dimension (D2) of the thick part and the thickness dimension (D1) of the thin part is 3 or more and 12 or less. Or the zipper tape of 2.   The zipper tape according to any one of claims 1 to 3, wherein an adhesive layer is provided on one surface of the belt-like base portion, the pair of thick portions, and the rib.   The zipper tape according to any one of claims 1 to 4, wherein the adhesive layer is a polyolefin resin having a melting point lower than that of the resin used for the belt-like base portion and the cut portion.   The zipper tape according to any one of claims 1 to 5, wherein the zipper tape according to any one of claims 1 to 5 is attached to the inner surface of the opening of the bag body having an opening capable of enclosing the inclusion. A packaging bag with a zipper tape, which is arranged with one surface adhered.

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