JP2007302314A - Laminate film for packaging, and liquid pouring nozzle using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure various kinds of excellent barrier properties specific to a biaxially oriented film by constituting a base film layer of the biaxially oriented film with a low deposition cost and also form an entirely fully homogeneous deposited film, and to provide a packaging film capable of surely assuring a linear or curved progress of tearing a liquid pouring nozzle in a desired direction. <P>SOLUTION: A biaxially oriented base film layer 2 which may have a deposited layer is interposed between two sealant layers 3 and 4. The base film layer 2 has a tear-guiding flaw 5 consisting of intermittent or continuous molten traces 6 formed by irradiation with a laser beam. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film for packaging, which is used for a liquid pouring nozzle and makes it easy and reliable to tear and unseal the nozzle as expected, and a liquid pouring nozzle using the same It is.

  For example, as a liquid dispensing nozzle that exhibits an excellent non-return function when a liquid having a volume exceeding 100 ml is dispensed in a plurality of times from a packaging bag, the applicant has previously described Patent Document 1 This is one in which the base end portion is fused and joined to the inner surface of the packaging bag body by the outermost sealant layer at the side or top of the flexible packaging bag body. A laminated film on each side of the front and back, for example, a laminated film of two sides of the front or back, or a center, comprising a thermoplastic, uniaxially or biaxially stretched base film layer and respective sealant layers laminated therebetween One laminated film that is folded back and forth at the part is fused to each other at the peripheral part except the base end side in the mutually facing posture of one sealant layer.

By the way, the use and consumption, etc., of the package in a bag filled and packaged in a packaging bag provided with such a liquid pouring nozzle, the pouring of the fused portion at the tip of the liquid pouring nozzle, The tip opening is formed in the nozzle by removing it by tearing cutting, etc., and then the packaging bag can be tilted so that the tip opening of the nozzle faces downward. The pouring nozzle made of the laminated film is spaced apart from the front and back sides under the action of the water head pressure of the packaged object to open the front end opening, thereby allowing the packaged object to be dispensed as required.
When the packaged item is dispensed in this way, the flexible packaging bag body shrinks or collapses by the amount corresponding to the dispensed volume without sucking outside air as the packaged item is dispensed. Will be transformed.

After the required amount of items to be packaged is poured out by tilting the packaging bag, the packaging bag is returned to its original standing position to stop the dispensing. It brings about mutual contact in the width direction of the film on the front and back sides of the dispensing nozzle, in other words, in the vertical direction, and reliably prevents the outside air from entering the packaging bag.
Therefore, in the packaging bag having the dispensing nozzle, the packaged items in the bag are sufficiently protected from contact with the outside air during and after the dispensing as well as before the dispensing of the packaged items. Thus, oxidation, fouling, etc. of the packaged items in the bag are effectively prevented.

In addition, such close contact here of the film on the front and back of the pouring nozzle, in addition to returning the pouring nozzle to the original shape at the time of manufacture by releasing the pouring nozzle from the action of the hydraulic head pressure by the standing back of the packaging bag When the article to be packaged in the dispensing nozzle returns to the inside of the packaging bag body, the front and back films are exposed to a reduced pressure atmosphere and are mutually adsorbed under negative pressure, etc. Adhesion is assisted by causing the packaging bag body, which has been shrunk or crushed and deformed as the article to be packaged out of the packaging bag, has a tendency to depressurize the interior based on its inherent elastic restoring force. It will be.
In this way, the tip opening of the packaging bag can be automatically sealed in close contact with the rising and returning of the packaging bag without any special operation on the dispensing nozzle, and the dispensing nozzle has an excellent check function. It can be demonstrated.

  In order to remove the tip fused portion of the dispensing nozzle in such a manner by tearing with fingers, at least one of the fused portions facing each other in the width direction of the laminated film, According to the present invention, it is preferable to provide a V-shaped bent portion positioned corresponding to the expected opening position of the nozzle. According to this, since the fusion portion itself bends in a V shape, a V notch, − It is assumed that the tearing can be sufficiently induced without separately forming a tearing start edge, such as a notch, and that the tearing induction portion can be visually recognized very easily.

Moreover, in this pouring nozzle, it is sufficient that the laminated film on the front and back constituting the pouring nozzle has a thickness of 20 to 100 μm so that the function as the nozzle is properly exhibited, and sufficient softness and pressure responsiveness are provided. If it is less than 20 μm, it is difficult to properly squeeze the packaging in the bag to the intended position, while if it exceeds 100 μm, It is assumed that the waist becomes too strong and the smoothness of the above-described adsorption sealing may be impaired.
JP-A-2005-59958

  By the way, in such a liquid pouring nozzle, in order to ensure the reliable display of the non-return function as described above, the thickness of the laminated film constituting it, directly the thickness of the uniaxial or biaxially stretched base film layer is equivalent. As a thin wall, the laminated film is given high flexibility. On the other hand, barrier properties such as a gas barrier property and a water vapor barrier property that become insufficient due to the thinning, such as aluminum or other metal materials, glass or others. The deposited film of the inorganic material is formed on the base film layer.

  For this reason, in the case of tearing and unsealing the tip of the liquid pouring nozzle when pouring out the package in a bag filled and packaged in a packaging bag, when the base film layer of the laminated film is a biaxially stretched film, Because the so-called waist of the laminated film is too weak, the tearing of the liquid dispensing nozzle by fingers is always advanced in a straight line, etc., exactly in the intended direction regardless of the presence or absence of the tearing edge. When the base film layer is a uniaxially stretched film, the tearing direction is easier to travel in the required direction than the biaxially stretched film, but the tearing direction. In addition, the uniaxially stretched film has a large amount of heat shrinkage during the formation of the deposited film on the film, so it has various barrier properties compared to the biaxially stretched film. of Barrier properties have uniaxially oriented film is disadvantageously unstable.

  The object of the present invention is to solve such problems of the prior art. The object of the present invention is to form the base film layer by a biaxially stretched film having a low vapor deposition cost. In addition to ensuring various excellent barrier properties inherent to the biaxially stretched film, it is possible to form a vapor deposition film that is sufficiently uniform throughout the entire film under a small amount of heat shrinkage when forming a vapor deposition film, In addition, to provide a packaging film that can ensure the linear or curved progression of tearing of the liquid dispensing nozzle in the intended direction, and a liquid dispensing nozzle using the same. is there.

The laminated film for packaging according to the present invention comprises a biaxially stretched base film layer that may include a vapor-deposited layer of a metal material, an inorganic material, etc., between two sealant layers, and comprises a laser beam. The biaxially stretched base film layer having a high or high absorptivity is provided with tear-inducing scratches consisting of melting marks formed intermittently or continuously by melting and cooling solidification by laser beam irradiation. .
Here, the depth of the intermittent or continuous melt mark is the depth penetrating the biaxially stretched base film layer or the depth ending in the middle of the thickness, regardless of the formation form thereof. can do.

  Here, the biaxially stretched base film layer is preferably composed of a polyethylene terephthalate film, a nylon resin film, a polypropylene film or an ethylene vinyl alcohol copolymer film having a thickness of 8 to 30 μm, especially 10 to 25 μm. On the other hand, the sealant layer is preferably composed of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer or ionomer having a thickness of 10 to 60 μm, particularly 15 to 50 μm.

  And the liquid pouring nozzle according to the present invention is a side portion or a top portion of the soft packaging bag main body, and the inner end surface of the packaging bag main body is fusion bonded by the outermost sealant layer, A laminated film for packaging on each side of the front and back, each of which has a biaxially stretched base film layer that protrudes from the packaging bag body and may have a vapor-deposited layer, and each sealant layer that is laminated with the biaxially stretched base film layer interposed therebetween; For example, two front and back films that are separate from each other or one film that is folded back and forth at the center are fused to each other at the periphery of the sealant layer facing each other, excluding the base edge. In addition, each biaxially stretched base film layer is subjected to laser beam irradiation to form tear-induced flaws formed by intermittent or continuous melting marks as described above. But on the line.

  In the laminated film for packaging according to the present invention, for a laminated film comprising a biaxially stretched base film layer that may have a required vapor-deposited layer and respective sealant layers laminated on both front and back surfaces thereof, Biaxial stretching by irradiating a laser beam from either one of the sealant layers, through a high laser beam transmittance, for example, through the transparent sealant layer, having a high laser beam absorption rate or an increased absorption rate The base film layer is melted to a required depth and cooled and solidified, and this is performed intermittently or continuously under the relative displacement between the irradiation position of the laser beam and the laminated film, so that the biaxial The stretched base film layer, and thus the laminated film, can be formed with tear-induced flaws as expected, linear or curvilinear.

In this case, a carbon dioxide laser, a yag laser, or the like can be used as the laser beam.
Also, here, the melting and cooling solidification of the biaxially stretched base film layer means that the film material portion that has absorbed the laser beam and generated heat by being melted is laminated to the biaxially stretched base film layer by laser impact. It means that the molten film is once dispersed between the sealant layer and then the molten film portion is cooled and solidified.

  When the melted film material part is gasified, delamination of the laminated film may occur due to the increase in volume, but the peeled part is in a very narrow range, and the melted film part Since it adheres again with the cooling, there is no problem in the bonding strength of the laminated film.

  Even though the tear-induced scratches formed in this way on the biaxially stretched base film layer are weak as a whole laminated film, for example, a liquid dispensing nozzle constructed by fusion-bonding two laminated films, It can function so that tearing by fingers always proceeds reliably following the tear-induced flaw, and can function to sufficiently prevent unintended changes in the direction of tearing.

  Thus, with this laminated film, it is possible to form a vapor-deposited film with the required physical properties on the base film layer made of a biaxially stretched film sufficiently inexpensively and appropriately, and in the direction of tearing as expected. Can be effectively secured under the action of a tear-induced wound.

  And these are the case where the biaxially stretched base film layer is provided with tear-inducing flaws composed of continuously formed melt marks, and intermittently, preferably at intervals of 5 mm or less, more preferably at intervals of 2 mm or less. The same applies to the case where a tear-induced flaw made of intermittently formed melting marks is provided.

  By the way, when the depth of the melt mark is a depth penetrating the biaxially stretched base film layer, if the melt mark is formed intermittently, the direction of tearing is changed regardless of whether the melt mark is formed continuously. On the other hand, when the depth ends in the middle of the thickness of the biaxially stretched base film layer, the biaxially stretched base film layer is combined with the identification of the direction of tearing. The original physical properties can be advantageously exhibited together with the vapor deposition layer.

  In such a laminated film for packaging, when the biaxially stretched base film layer is composed of a polyethylene terephthalate film, nylon resin film, polypropylene film or ethylene vinyl alcohol copolymer film having a thickness of 8 to 30 μm, it is transparent. The laminated film itself can exhibit water vapor barrier properties, gas barrier properties, and the like as required while securing properties, glossiness, strength, and the like.

  Here, if the thickness of the base film layer is less than 8 μm, the vapor deposition layer may be formed, but the barrier properties such as water vapor and gas may be insufficient. On the other hand, if the thickness exceeds 30 μm, There is a risk that the adhesion or other performance of the inner surface of the nozzle may be impaired when stopping the pouring of the packaged object due to the excessively high stiffness or bending strength of the film.

  Also, when the sealant layer is composed of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer or ionomer having a thickness of 10 to 60 μm, it is excellent by heat sealing at a relatively low temperature. The seal strength can be exhibited.

  Here, if the sealant layer is less than 10 μm, there is a possibility that sufficient seal strength cannot be ensured, and if it exceeds 60 μm, the waist or bending strength of the laminated film may be excessively increased.

  And the liquid pouring nozzle which concerns on this invention can fully exhibit various barrier properties according to a requirement with a sufficiently cheap laminated film by comprising it with the laminated film for packaging mentioned above. At the same time, it is possible to reliably and sufficiently bring in close contact with the inner surface of the nozzle accompanying the stoppage of the packaged articles in the bag, thereby reliably preventing the outside air from entering the packaging bag.

  In addition, in this pouring nozzle, the biaxially stretched base film layers of the laminated film on both the front and back sides are provided with tear-inducing scratches consisting of intermittent or continuous melting marks, so that Tearing and unsealing can be made to proceed sufficiently smoothly and reliably along the tear-inducing flaw.

  FIG. 1 is a view showing an embodiment of a laminated film for packaging according to the present invention. This laminated film for packaging 1 includes a biaxially stretched base film layer 2 that may have a vapor-deposited film having required physical properties, and this Respective sealant layers 3 and 4 laminated on the front and back surfaces of the stretched base film layer 2 are provided.

  Here, the biaxially stretched base film layer 2 is composed of, for example, a polyethylene terephthalate film, a nylon resin film, a polypropylene film or an ethylene vinyl alcohol copolymer film having a thickness of 8 to 30 μm, especially 10 to 25 μm. The sealant layers 3 and 4 are made of, for example, polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer or ionomer having a thickness of 10 to 60 μm, particularly 15 to 50 μm. It is preferable to do.

  Moreover, this laminated film for packaging 1 has a biaxially stretched base film layer 2 as an intermediate layer, as shown in FIG. 1 (a), linearly in its length direction, or in its length direction. It includes a tear-inducing flaw 5 that extends in a straight line in a direction intersecting at a required angle or extends in a required curved shape.

  Here, the tear-inducing flaw 5 is formed on the biaxially stretched base film layer 2 having a high absorption rate or a high absorption rate of the laser beam, on one side of the sealant layers 3 and 4 having a low absorption rate of the laser beam. From, for example, by irradiating a laser beam such as a carbon dioxide laser or a yag laser as disclosed in JP-A-6-24462, the biaxially stretched base film layer 2 is melted to a required depth, It is formed by intermittent or continuous melting marks 6 formed by cooling and solidification. The depth of the melt mark 6 in this case is set to a depth up to the middle of the thickness of the base film layer 2 as shown in FIG. 1B, and as illustrated in FIG. A depth corresponding to a thickness of 2 can also be used.

  Note that the melt mark 6 formed by such local melting and cooling solidification of the biaxially stretched base film layer 2 is usually indirectly melted by the melted base film resin and the melted base film resin. It will be re-embedded with the sealant resin.

  FIG. 2 is a perspective view schematically illustrating the melting mode of the biaxially stretched base film layer 2. The one shown in FIG. 2 (a) is melted intermittently, and FIG. 2 (b) What is shown is what melts continuously to form melted marks 6 respectively, and what is shown in FIG. 2 (c) melts and forms shallow continuous grooves, and intermittent through holes are formed at the bottom of the continuous grooves. The melt marks 6 are formed by melting and forming, and in the figure, the intermittent melting part shown in FIGS. 2 (a) and (c) and the continuous melting part shown in FIG. 2 (b) are As shown in FIG. 1 (b), the thickness of the base film layer 2 can be terminated halfway, and as shown in FIG. 1 (c), the base film layer can be penetrated.

  Here, the intermittent melting part shown in FIG. 2A is, for example, by intermittently irradiating the film 1 with a laser beam while continuously moving the laminated film 1 at a constant speed in the length direction thereof. 2 (b) can be formed by continuously irradiating the laminated film 1 with a laser beam at a constant intensity, and the composite melting shown in FIG. 2 (c). The part can be formed by intermittently increasing or decreasing the irradiation energy of the laser beam while continuously moving the laminated film 1 as disclosed in, for example, JP-A-6-24462.

  According to the laminated film 1 for packaging as described above, the biaxially stretched base film layer 2 is made thin, and a barrier film as expected can be stably provided by providing a vapor deposition film having required physical properties thereto. In addition, the finger can always be smoothly and smoothly traced through the induced flaws 5 without any deviation from the direction of the orientation of the base film layer 2 under the action of the tear-inducing flaws 5. Can be torn.

FIG. 3 is a plan view showing an embodiment of the liquid dispensing nozzle according to the present invention, which is constituted by the above-described laminated film for packaging, in relation to a soft packaging bag body.
This is a posture in which the front and back laminated films 1 located on each of the front and back sides or the tear-inducing flaws 5 of one folded film 1 in a folded state are aligned with each other on both sides of the front and back. One sealant layer of the laminated film 1 is melted by heat sealing or the like, as shown by hatching in the drawing in the peripheral portion excluding the base end side, and an unnecessary outer edge portion is cut and removed. The fusion part 7 formed in this way is provided with a V-shaped bent part 8 at a position on at least one side corresponding to the formation position of the tear-inducing flaw 5, in the figure, at a corresponding position on the upper side. is there.

  In the liquid pouring nozzle 9 configured as described above, the tear-inducing flaws 5 of the front and back films 1 extend on the required planned line of the tearing opening to the liquid pouring nozzle 9.

  Therefore, according to this liquid pouring nozzle 9, the portion of the fused portion 7 on the tip side from the V-shaped bent portion 8 is gripped with fingers, and tearing is started from the position of the bent portion 8. The tearing can follow the formation position of the tear-inducing flaw 5 and can proceed smoothly and always accurately.

  By the way, the liquid pouring nozzle 9 is a side portion or a top portion of a soft packaging bag body, and partially illustrated by a virtual line in FIG. The outermost sealant layer at the base end of the pouring nozzle 9 is fusion-bonded to the sealant layer on the inner surface of the main body 10 by heat sealing or the like, as shown by hatching in FIG. By integrating the nozzle 9 into the packaging bag main body 10 in a projecting posture to the side thereof, a part of the packaging bag 11 is obtained.

  In the case where such a packaging bag 11 is used for filling and packaging of an article to be packaged such as a liquid, when the article to be packaged needs to be poured out from the packaging bag 11, the fused portion of the liquid dispensing nozzle 9 7, the distal end portion of the V-shaped bent portion 8 is gripped with fingers, and the distal end portion of the pouring nozzle 9 is opposite to the proximal end portion as illustrated in FIG. By applying this force, the liquid dispensing nozzle 9 can be appropriately torn and unsealed simply and always as expected, following the tear-inducing flaw 5 as described above.

It is a figure which shows embodiment of the laminated | multilayer film for packaging based on this invention. It is a perspective view which illustrates typically the fusion mode of a biaxial stretching base film layer. It is a top view which shows embodiment of the liquid extraction nozzle which concerns on this invention in relation to a packaging bag main body. It is a figure which shows the tearing-opening example of a liquid pouring nozzle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated film for packaging 2 Biaxially stretched base film layer 3, 4 Sealant layer 5 Tear induction flaw 6 Melting mark 7 Fusion part 8 Bending part 9 Liquid pouring nozzle 10 Packaging bag main body 11 Packaging bag

Claims (5)

A laminated film for packaging comprising a biaxially stretched base film layer that may have a vapor deposition layer between two sealant layers,
A laminated film for packaging, in which a biaxially stretched base film layer is provided with tear-inducing flaws consisting of intermittent or continuous melting marks by irradiation with a laser beam. The laminated film for packaging according to claim 1, wherein the depth of the intermittent or continuous melt mark is a depth penetrating the biaxially stretched base film layer or a depth ending in the middle of the thickness. The laminated film for packaging according to claim 1 or 2, wherein the biaxially stretched base film layer is composed of a polyethylene terephthalate film, a nylon resin film, a polypropylene film or an ethylene vinyl alcohol copolymer film having a thickness of 8 to 30 µm. . The packaging laminate according to any one of claims 1 to 3, wherein the sealant layer is composed of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer or ionomer having a thickness of 10 to 60 µm. the film. It is a liquid pouring nozzle that protrudes from the packaging bag main body at the side or top of the soft packaging bag main body, the base end of which is fused and bonded to the inner surface of the packaging bag main body by the outermost sealant layer. And
A laminated film for packaging on each side of the front and back comprising a biaxially stretched base film layer that may have a vapor deposition layer and respective sealant layers laminated therebetween, with one sealant layer facing each other In addition, the peripheral portions other than the base end are fused to each other, and tear-induced scratches formed by intermittent or continuous melt marks by laser beam irradiation are torn on each biaxially stretched base film layer. A liquid pouring nozzle provided on the opening formation line.

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