JP2012056589A - Packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give directionality of tearing by easy opening means of a packaging material.SOLUTION: In the packaging material 1 including a laminated body having a plurality of laminated films 2, 3, a tearing guide line M constituted of a groove having a width of 1-10 μm is formed on the surface of the packaging material.

Description

  The present invention relates to an easy-opening means for a packaging material made of a laminated film, and more particularly relates to a material having directionality for tearing by the easy-opening means.

  As an easy-opening means for a packaging material composed of plastic or a laminate of a plurality of films mainly made of plastic, as shown in FIG. 12, a notch shape serving as a tearing start portion at the end of the packaging material B produced in the packaging bag B It is widely practiced to provide a notch N. And this easy-opening means is used abundantly in the packaging bag B as shown in FIG. 12 which provided the fastener F for implement | achieving the reseal after opening (refer patent document 1).

Japanese Utility Model Registration No. 3152771

  In the easy-opening means, the packaging bag B starts from the notch tip N1 as the starting point by picking the upper and lower two parts of the packaging bag sandwiching the notch-shaped notch N points with a fingertip and pulling them in different directions. Torn. However, since the above-described pulling direction and pulling force are not uniform, there is a problem that the tearing direction becomes indefinite as shown in FIG. 13 and the shape of the torn cut becomes irregular.

  In the packaging bag B shown in FIG. 12 provided with the fastener F for realizing the re-sealing after opening, the packaging bag is re-sealed by using the fastener F even after opening the packaging bag by tearing. Therefore, it must be avoided that the shape of the torn cut becomes irregular. Therefore, in the packaging bag as described above, a means for accurately guiding tearing from the tear starting portion in the direction crossing the packaging bag is required.

  The present invention was created for the purpose of providing a packaging material having directionality for tearing by an easy-opening means that has solved the above-mentioned problems, and has the following configuration.

  The packaging material according to the present invention has a configuration in which a tearing guide line composed of a groove having a width of 1 μm to 10 μm is applied to the surface of the packaging material, which is a laminated material in which a plurality of films are laminated.

In the packaging material of the present invention, the tear guide wire is applied by the following various means.
(1) A tear induction line is applied by dividing a part of the film constituting the laminate at intervals of 1 μm to 10 μm in width.
(2) In the above case, for example, in a packaging material composed of a laminate in which films are laminated in two layers, a tearing guide wire is applied by dividing the film of the first layer at intervals of 1 μm to 10 μm in width. Moreover, in the packaging material which consists of a laminated body which laminated | stacked the film in 3 layers, a tear induction | guidance | derivation line is given by dividing | segmenting the film of a 1st layer and a 2nd layer by the space | interval of 1 micrometer-10 micrometers.
(3) A tear guide wire is formed by providing a groove having a width of 1 μm to 10 μm on the surface of a part of the films constituting the laminate.
(4) In the above case, for example, in a packaging material composed of a laminate in which films are laminated in two layers, a tearing guide wire is applied by providing a groove having a width of 1 μm to 10 μm on the surface of the first layer film.
(5) In a packaging material composed of a laminate in which films are laminated in three layers, the first layer film is divided at intervals of 1 μm to 10 μm in width, and the first layer film is formed on the surface of the second layer film. A tear guide line is provided by providing a groove of the same width along the parting point.

The present invention configured as described above has the following specific effects.
(1) By applying a tear guide wire composed of a groove having a width of 1 μm to 10 μm on the surface of the packaging material, the thickness of the packaging material in the groove portion is reduced, and the strength of the above portion against the tearing force is weakened. . Therefore, the above portion is particularly easily torn, and the direction to be torn along this portion is obtained.
(2) In the above case, as shown in FIG. 6B, when the tear guide line of the packaging material 1A is not a groove but a cut K, the thickness of the packaging material at the cut portion is reduced, but the width is zero. equal. Therefore, when the pulling direction at the time of tearing is not uniform, it is difficult to obtain the directionality to be torn along this portion, and there is a possibility that the tearing is induced in a direction other than the cut. On the other hand, as shown in FIG. 6 (A), the packaging material 1 of the present invention has a tear guide wire M composed of a groove having a width of 1 μm to 10 μm, so that the thin portion α of the packaging material is 1 μm to 10 μm. It has a width, and even if the pulling direction at the time of tearing is not uniform, tearing is surely guided to the groove portion.
(3) When a tear guide line is obtained by dividing the film, if the tear guide line is not a groove but a cut, the end faces of the film will contact each other as shown in FIG. Due to the difference in expansion and contraction between the films separated by drying after application of the adhesive, the end faces may face each other and swell may occur. On the other hand, in the case of the present invention, the tear guide wire is composed of grooves having a width of 1 μm to 10 μm.
(4) When printing is applied to the packaging material, it is usually the previous stage of the lamination process. When a tear guide line is provided on the printed first layer film (front film), when the film is divided to obtain a tear guide line, the tension of the tension or mechanical There is a risk that the printed pattern will be displaced due to the delicate tilt of the roll. In particular, in the solvent laminating method described later, when the insertion stage of the cutter blade to be cut is in a stage before the drying section, the film is shrunk due to heat applied in the drying section, so that the pattern is likely to shift. This problem does not divide the film completely when laminating, but by providing a groove having a width of 1 μm to 10 μm on the surface of a part of the film constituting the laminated body, the film does not divide. It can be solved because it is laminated in a connected state.

The perspective view of the state just before lamination | stacking of the packaging material of 1st Example of this invention. The perspective view of the state after lamination | stacking of the packaging material of 1st Example of this invention. The perspective view of the state after lamination | stacking of the packaging material of 2nd Example of this invention. The perspective view of the state after lamination | stacking of the packaging material of 3rd Example of this invention. The perspective view of the state after lamination | stacking of the packaging material of 4th Example of this invention. Sectional drawing which shows the effect | action of the packaging material of this invention. Process drawing which shows the manufacturing method of the packaging material of this invention. Process drawing which shows the Example from which the manufacturing method of the packaging material of this invention differs. The top view of the packaging bag by the packaging material of this invention. Sectional drawing of the packaging bag by the packaging material of this invention. The enlarged plan view of the principal part of the Example from which the packaging bag by the packaging material of this invention differs. The top view of the packaging bag by the packaging material of a prior art. Sectional drawing which shows the effect | action of the packaging bag by the packaging material of a prior art.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a view showing a state before stacking of a packaging material according to a first embodiment of the present invention, and FIG. 2 is a view showing a state after stacking. In this embodiment, a laminate composed of two layers of a second layer (back side) film 2 and a first layer (front side) film 3 is employed. Here, unstretched polypropylene, linear low-density polyethylene, and low-density polyethylene are used as the material for the second layer film 2, and biaxially stretched polypropylene, biaxially stretched nylon, and biaxially stretched polyester are used as the material for the first layer film 3. Of course, the materials are not limited to these.

  Reference symbol M in the figure denotes a tear guide wire composed of a groove that constitutes a means for easy opening. Here, the tearing induction line is given by dividing the film 3 of the first layer in the film constituting the laminated body at intervals of 1 μm to 10 μm in width.

  The tear induction line M described above is applied to the first layer film 3 and the second layer film 2 in a layer before the layering step. FIG. 7 is a diagram showing an example of the lamination process according to the present invention in the case of a solvent lamination method (dry lamination method). An adhesive 40 diluted with a solvent is applied to the first layer film 3 with a gravure roll 41 and then dried by passing through a drying section 42. Reference numeral 43 in the figure denotes a cutter that divides the first layer film 3 at intervals of 1 μm to 10 μm in width, and here, between the drying stage by the drying section 42 and the lamination stage of the first layer film 2 by the nip roll 44. It is performed at the stage.

  FIG. 8 is a diagram showing an example of the non-solvent laminating method of the lamination process of the present invention. Here, the first layer film 3 is divided by a cutter 53 at intervals of 1 μm to 10 μm at a stage prior to the step of laminating the first layer film 3 and the second layer film 2 by the nip roll 54. In the case of this laminating method in which the solventless adhesive 50 having a reduced viscosity by heating is applied to the film and then laminated, there is no drying process after the adhesive is applied, so there is a difference in expansion and contraction between the separated films due to drying. Does not occur. Therefore, here, the division is performed before the adhesive application step. In addition, the code | symbol 55 is a cooling part in the figure.

  9-10 is a figure which shows the packaging bag B using the above packaging material 1. FIG. Here, a bag with a fastener F is illustrated as the packaging bag B. The packaging bag B is formed by overlapping the second layer films 2 of the packaging material 1 and welding the periphery 60 by heat sealing or the like. The easy opening means is provided between the fastener F and the upper end of the bag so as to cross the bag. Here, one tear guide wire M is provided. The notch-shaped notch 61 is provided continuously to the tear guide line M. Here, the tear guide lines M are provided on both front and back surfaces of the packaging bag B (see FIG. 10), but may be provided only on one side.

  FIG. 11 is a view showing a packaging bag B of a different embodiment using the packaging material 1 described above. Here, two tearing guide lines M are provided at intervals. A notch-shaped notch 61 is provided at an end of the packaging bag B at a location sandwiched between the tear guide wires. Moreover, although the tear guide wire 11 is provided on the front and back of the packaging bag (see FIG. 10), it may be provided only on one side. In the packaging bag B of this embodiment, as shown by a dotted line in FIG. 11, when the bag is torn by using the notch 61 as a clue, the tearing direction is initially not constant, but is sandwiched between the two tearing guide lines M and M. Therefore, it always reaches one of the guide lines, and after that, it is guided along the guide line in the transverse direction of the bag.

  FIG. 3 is a view showing a state after stacking of the packaging material 11 of the second embodiment of the present invention. In this embodiment, a laminate composed of two layers of a second layer film 12 and a first layer film 13 is employed. Reference numeral M2 in the figure denotes a tearing guide line made of a groove that constitutes a means for easy opening. Here, a tear induction line is provided by providing a groove having a width of 1 μm to 10 μm on the surface of the film 13 of the first layer. In this embodiment, the film 13 is not divided, and the thickness of the portion where the tear guide wire M2 is applied becomes thin. The thickness is 1 μm or more.

  FIG. 4 is a view showing a state after stacking of the packaging material 21 of the third embodiment of the present invention. In this embodiment, a laminate comprising three layers of a third layer film 22, a second layer film 23, and a first layer film 24 is employed. Reference numeral M3 in the figure denotes a tear guide wire made of a groove that constitutes a means for easy opening. Here, the first layer film 24 and the second layer film 23 are divided at intervals of 1 μm to 10 μm in width to give a tear induction line.

  FIG. 5 is a view showing a state after stacking of the packaging material 31 according to the fourth embodiment of the present invention. In this embodiment, a laminate composed of a third layer 32, a second layer 33, and a first layer 34 is employed. Reference numeral M4 in the figure denotes a tear guide wire made of a groove that constitutes a means for easy opening. Here, the first-layer film 34 is divided at intervals of 1 μm to 10 μm in width, and a groove having the same width is provided on the surface of the second-layer film 33 along the division point of the first-layer film. A tear guide wire is applied.

1 Wrapping material M Tear guide wire

Claims (7)

The packaging material which consists of a laminated body which laminated | stacked the some film, The tearing induction wire which consists of a groove | channel with a width | variety of 1 micrometer-10 micrometers was given to the surface of a packaging material. The packaging material of Claim 1 which gave the tear induction | guidance | derivation line by parting the film in the film which comprises a laminated body by the space | interval of 1 micrometer-10 micrometers in width. The packaging material according to claim 2, wherein a tear induction wire is provided by dividing the film of the first layer at intervals of 1 μm to 10 μm in a packaging material comprising a laminate in which the film is laminated in two layers. The packaging material according to claim 2, wherein a tear induction wire is provided by dividing the film of the first layer and the second layer at intervals of 1 μm to 10 μm in a packaging material comprising a laminate in which films are laminated in three layers. The packaging material of Claim 1 which gave the tear induction | guidance | derivation line by providing a groove | channel with a width | variety of 1 micrometer-10 micrometers on the surface of the one part film in the film which comprises a laminated body. The packaging material according to claim 5, wherein a tear induction wire is provided by providing a groove having a width of 1 μm to 10 μm on the surface of the first layer film in a packaging material comprising a laminate in which films are laminated in two layers. In a packaging material composed of a laminate in which films are laminated in three layers, the first layer film is divided at intervals of 1 μm to 10 μm in width, and the first layer film is divided on the surface of the second layer film. 6. The packaging material according to claim 1, wherein a tear guide wire is provided by providing a groove having the same width along the groove.

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