JP2012162294A - Film-like check nozzle excelling in tear opening, and method for forming tear guide line for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film-like check nozzle excelling in a tearing property, maintaining tensile strength of the film-like check nozzle while effectively reducing tearing force required for opening the nozzle, and accurately guiding the travel direction of a tear of the nozzle.SOLUTION: The flat film-like check nozzle for a soft packaging bag for filling a liquid substance is adapted to prevent the intrusion of outside air into the bag by interposing the liquid substance between the inner surface side sealant layers of an overlapping pair of front and rear laminated plastic films each comprising a base film layer, the inner surface side sealant layer and an outer surface side sealant layer, the sealant layers being laminated to hold both sides of the base film layer. Each of the surfaces of the inner surface side sealant layers in tear predetermined positions on the nozzle tip side of the pair of front and rear laminated plastic films composing the nozzle is provided with one or more tear guide lines extended traversing a pouring passage.

Description

  The present invention is a film check nozzle (liquid) having a self-sealing check function that automatically prevents the outside air from entering the bag, which is composed of two laminated soft plastic laminated films on the front and back. In particular, the present invention proposes a film-like check nozzle that is excellent in tearing and unsealing properties.

  As a film-like non-return nozzle made of a soft laminated plastic film and having a self-seal non-return function, there are those disclosed in Patent Documents 1 and 2 according to the proposals of the inventors.

  The film check nozzles disclosed in these documents are laminated on a thermoplastic base film layer, for example, a base film layer composed of a biaxially stretched PET layer or an NY layer, on both sides of the base film layer. Each side portion excluding the base end side, with a pair of laminated plastic films consisting of three layers of a non-stretched PE layer or a PP sealant layer and a pair of front and back laminated plastic films. And preferably formed by fusing each other by heat sealing.

The film-like non-return nozzle is configured such that a liquid material is always present by a capillary action in an extraction passage formed between two overlapping front and back laminated plastic films, and the intermolecular molecules generated between the films at this time. Due to the high adhesion force derived from the force, it is possible to exhibit a self-seal check function that prevents the intrusion of outside air.
JP 2005-15029 A JP 2010-18323 A

  In the conventional film check nozzle, as described in Patent Document 1, a transverse groove is provided in the base film layer at the position where the nozzle is scheduled to be opened by laser beam irradiation, etc., and this functions as a tearing guide rod. I am letting. However, the base film layer is a support base material for the film-like non-return nozzle. If a transverse groove is formed in the base film layer, the tensile strength decreases, and there is a possibility that the base film layer may be broken by mistake during handling. is there.

  In recent years, from the viewpoint of food and beverage hygiene, when filling a packaging bag, the food and beverage are heat sterilized, and the food and beverage are filled and packaged in a packaging bag (hot pack) while maintaining a high temperature state, Retort packs that are expected to boil at high temperatures when eating food and drink are widely distributed.

When applying the packaging bag provided with the film-like check nozzle disclosed in Patent Documents 1 and 2 for use in such hot packs and retort packs, the packaging bag is not only a packaging bag body but also a film-like check nozzle. It is also necessary to have sufficient heat resistance. Such a heat resistant film-like check nozzle is generally formed by a laminated plastic film in which a stretched base film layer and a non-stretched sealant layer made of high-density polyethylene, polypropylene, or the like are laminated. . However, since such a laminated plastic film usually has a characteristic that an unstretched sealant layer having heat resistance is easy to stretch, opening of notches such as I notch and V notch provided near the nozzle tip is opened. If an attempt is made to tear and open with the fingers from the means as a starting point, the tearing force causes the film at the opening position to stretch, and there is a problem that tearing is not easy.
In particular, in the case of a large-capacity large bag, the tear distance near the tip of the nozzle will be long, so that it will not be possible to tear cleanly, and the progress direction of the tear at the nozzle opening position should be guided reliably (straightly). There was a risk of not being able to.

  Moreover, when the laminated plastic film at the opening position is forcibly teared and opened at the tip of the film check nozzle as described above, it becomes stretched and waved. Therefore, the flatness between the inner surfaces of the two laminated plastic films constituting the film-like non-return nozzle is deteriorated, the adhesion force is lowered, and the self-seal non-return function cannot be effectively exhibited. .

  Further, in the conventional film-like check nozzle, when the objects to be packaged are adhered to each other by the check function of the nozzle after discharging the package from the tip spout, the laminated plastic film constituting the nozzle There is a problem in that the package back is pushed out from the spout by the spring back, and dripping easily occurs.

  Therefore, the present invention aims to solve the above-mentioned problems of the prior art, and its purpose is to provide the tearing force required to open the film check nozzle. A film-like check nozzle with excellent tearing and opening ability that can maintain the tensile strength of the nozzle even when effectively reduced, accurately guide the direction of nozzle tearing, and suppress the occurrence of dripping. And to propose a method of forming the tear guide line.

  As a result of intensive studies to achieve the above object, the inventors have developed the present invention according to the following summary configuration. That is, the present invention comprises a base film layer and a pair of laminated plastic films on the front and back, which are composed of an inner surface side sealant layer and an outer surface side sealant layer laminated so as to sandwich both sides of the base film layer. In a flat film check nozzle for a soft packaging bag for filling a liquid material, the liquid material is interposed between the inner surface side sealant layers of the film to prevent the outside air from entering the bag. Each of the pair of laminated plastic films constituting the nozzle comprises one or a plurality of laminated plastic films extending across the pouring passage on the inner surface side sealant layer surface at the planned tearing position near the nozzle tip. A film-like non-return nozzle having excellent tear opening characteristics, characterized by providing a tear guide wire.

In the present invention, the film-like non-return nozzle has (1) a pouring passage at a position corresponding to the formation position of the tear guide line on the inner surface side sealant layer surface of the outer surface side sealant layer surface. Provided a tearing guide line consisting of one or more wires extending across,
(2) The tear guide line is composed of a groove formed continuously or intermittently by pressing a thinning roll tooth against the surface of the inner surface side sealant layer and / or the outer surface side sealant layer,
(3) The said thinning heating roll tooth is heated to 40-180 degreeC,
(4) The tear guide line is composed of a melt groove formed continuously or intermittently by irradiation of a laser beam to the surface of the inner surface side sealant layer and / or the outer surface side sealant layer,
(5) The width of the tear guide line is 1 μm to 2 mm / 1. (6) The thickness of the laminated plastic film at the position where the tear guide line is formed is ½ or less of the thickness of the other part. thing,
Is a more preferable solution.

  Further, the present invention provides a pair of soft laminated plastic films on the front and back, each comprising a base film layer and an inner surface side sealant layer and an outer surface side sealant layer laminated so as to sandwich both sides of the base film layer. The inner surface side sealant layer is overlapped with each other in an opposing posture, and the outer peripheral edge portion is melted together except for the base end portion connected to the side portion of the bag body and the central portion that forms the liquid discharge passage. Prior to forming a non-returning nozzle in the form of a film, a pouring passageway is formed on the inner surface side sealant layer surface of the pair of front and back laminated plastic films constituting the nozzle near the nozzle tip. A tear guide line forming method for a film-like check nozzle, wherein one or a plurality of tear guide lines extending transversely are formed.

In the present invention, the method for forming a tear guide line of the film check nozzle includes (1) a position corresponding to a formation position of the tear guide line on the inner surface side sealant layer surface of the outer surface side sealant layer surface. Forming one or more tear guide lines extending across the dispensing passage;
(2) The tear guide line is formed by pressing a thinning roll tooth against the surface of the inner surface side sealant layer and / or the outer surface side sealant layer,
(3) The said thinning heating roll tooth is heated to 40-180 degreeC,
(4) The tear guide line is formed by irradiating the surface of the inner surface side sealant layer and / or the outer surface side sealant layer with a laser beam,
Is a more preferable solution.

  In the present invention, one or a plurality of tear guide lines are provided on the inner surface side sealant layer surface of the laminated plastic film constituting the film check nozzle, preferably on the inner surface side and outer surface side sealant layer surfaces, respectively. Accordingly, the thickness of the laminated plastic film at the position where the tear guide line is formed is reduced, the tearing force required to open the check nozzle is reduced, and tearing with fingers can be performed smoothly and easily. Moreover, since the film-like check nozzle is opened along the tear guide line provided so as to cross the discharge passage of the film-like check nozzle, even if it is a large bag, the direction of travel of the tear Can be accurately induced.

  Further, in the present invention, the tear guide line is formed on the inner and outer surface side sealant layer surfaces of the laminated plastic film prior to the formation of the film-like check nozzle (the fusion of the outer peripheral edge). Since both ends of the guide wire are melted and crushed by fusion of the outer peripheral edge when forming the nozzle, there is no possibility that the end of the tear guide wire is cut during handling, and the nozzle is not opened accidentally. The seal strength of the check nozzle is not lowered. As described above, the guide line is crushed at the end of the tear guide line by fusing the outer periphery of the nozzle. However, once this part has been formed, the other part (guide from the beginning) Since the resistance of the film is smaller than that of the part where no wrinkles are inserted, tearing and opening can be easily performed with fingers or the like without providing a tear-inducing flaw such as a V notch on the outer peripheral edge of the nozzle. .

  In the present invention, since the rigidity of the laminated plastic film is reduced in the portion provided with one or a plurality of tear guide lines, the object to be packaged is discharged from the spout by the spring back of the film after the object to be packaged is discharged. Will not be extruded and dripping will not occur. Furthermore, the tear marks do not wave and become a straight line, and the laminated plastic film at the opening position can be made sufficiently smooth, so that the flatness of the two laminated plastic films on the front and back is improved, and the films are The non-return function can be effectively exhibited with close contact.

  Further, in the present invention, it is preferable to form a tear induction line on the inner and outer surface side sealant layer surfaces of the laminated plastic film by thinning heating roll teeth or laser beam irradiation. The width, length, and depth can be adjusted, and the tear guide wire is formed only in the sealant layer of the laminated plastic film, so that the tensile strength of the film check nozzle does not decrease. There is no fear that the check nozzle will be opened by mistake.

It is a top view which shows one Embodiment of the film-like non-return nozzle of this invention. It is sectional drawing which illustrates the film structure of the laminated plastic film which comprises the film-like non-return nozzle of this invention. It is one Embodiment of the expanded sectional view which follows the II-II line of FIG. It is other embodiment of the expanded sectional view which follows the II-II line of FIG. It is a microscope picture which shows the cross section of the tear opening position of a film-like non-return nozzle.

  The film-like non-return nozzle according to the present invention having a self-seal non-return function that automatically prevents the outside air from entering the bag is a thermoplastic, uniaxial or biaxially stretched base film layer, and both sides thereof. A three-layer soft laminated plastic film composed of a sealant layer (hereinafter referred to as an inner surface side sealant layer and an outer surface side sealant layer) laminated so as to sandwich the inner surface side, the inner surface side sealant layers face each other. Thus, the soft laminated plastic films on each side are overlapped, for example, two soft laminated plastic films formed by folding the inner surface side sealant layers facing each other in a pair of soft laminated plastic films, or folded back to half width The base end portion of the film, the inner surface side sealant layers facing each other, connected to the bag body of the packaging bag, and the liquid About the outer peripheral edge part excluding the central part which becomes the pouring path for the object, heat sealing, high frequency sealing or over a predetermined width, for example, a width of 0.5 to 3.0 mm, preferably a width of 1.0 to 2.0 mm, or It is formed so as to have a substantially wedge shape as a whole by fusing flatly so as not to wrinkle each other by an impulse seal or the like.

  Such a film-like non-return nozzle according to the present invention has an outer surface side sealant layer of the nozzle, for example, an olefin type such as an unstretched PE layer, a PP layer, an EVA layer, a metallocene-catalyzed polyethylene layer, at the base end portion. Packaging consisting of soft laminated plastic film (mainly two layers) through thermoplastic resin layers such as resin layer, ethylene vinyl acetate copolymer layer, ethylene ethyl acrylate copolymer layer, ionomer layer, PVDC layer, EVOH layer By fusing the sealant layer on the inner surface of the bag body (preferably, the same type of sealant layer) by, for example, heat sealing, it can be fusion-bonded simply, quickly and reliably in a state protruding from the packaging bag body. Configured as a packaging bag. Then, the liquid packaged liquid filled in the packaging bag is poured out by cutting and unsealing a planned opening portion formed near the tip of the film check nozzle.

  After opening the film check nozzle, the liquid package is required by tilting the main body of the packaging bag so that the opening (pour spout) of the film check nozzle faces downward. In this case, the film-like check nozzle made of a soft laminated plastic film is liquid by pressing the head pressure of the body of the packaging bag with the action of the water head pressure of the liquid package and the fingers. The intermolecular force between the film and liquid-film, which is generated by the constant presence of the object, resists the front and back sides to create a large gap, opens the pouring passage, It will be ready to dispense.

  When the liquid package is poured out through the opening (pour spout) of the film check nozzle, the bag body portion made of a soft laminated film has the non-return, regardless of the liquid package being poured out. Since the nozzle has a self-seal check function (air does not enter the bag body in place of the poured liquid package), outside air is not sucked (backflow). Sequential contraction or crushing deformation occurs in an amount corresponding to the volume of the extracted body.

  After filling the packaging bag with the liquid material, the required amount of liquid package is poured out from the bag by tilting it under the opening of the film check nozzle, and the film check The outflow of the liquid package from the opening of the nozzle is stopped by returning the packaging bag to the original standing posture. Due to the stoppage of the outflow, non-liquid portions in the discharge passage of the film check nozzle and in the bag body are always in liquid state due to the liquid matter filling the bag body due to capillary action. Since the package becomes wet due to the interposition, the inner surfaces of the laminated plastic film of the film-like check nozzle are strongly adhered to each other at the same time as the stoppage, and therefore provided at the tip of the film-like check nozzle. Since the opening also remains in close contact, it is possible to reliably prevent outside air from entering the bag body.

  In such a packaging bag equipped with a film-like check nozzle, the liquid package filled in the bag is completely cut off from the outside air not only before but also during and after the dispensing. It will be protected, and the oxidation, fouling, etc. of the liquid package in the bag will be effectively prevented.

  That is, as long as the liquid material remains in the bag body on the inner surface (pouring passage) of the two laminated plastic films constituting the film check nozzle, the liquid material is always present due to capillary action. become. In other words, the outer non-return function due to the close contact between the films is that the film-like non-return nozzle is released from the action of the hydraulic head pressure and returned to the original shape at the time of manufacture by the standing return of the flexible packaging bag. When a part of the liquid package in the film check nozzle returns to the bag body, the inner surface (pouring passage) between the pair of front and back films wetted by the liquid package due to the reduced pressure It is automatically performed by adsorbing to each other (self-sealing). Such close contact is caused by the bag body portion that has been shrunk or crushed and deformed as the liquid article to be packaged from the packaging bag is poured, and the inside tends to depressurize based on its inherent elastic restoring force. When working with, it becomes more certain.

  Thus, the film-like non-return nozzle has an excellent self-seal non-return function, with no special operation, etc., due to the stand-up return of the packaging bag and automatic close-sealing (self-seal) of the spout opening which is the opening of the packaging bag. Will be demonstrated.

  On the other hand, the re-pouring of the liquid package becomes more effective when the packaging bag is tilted as described above, and preferably by further pressurizing the body of the bag body, The stop can also be performed by returning the standing up of the packaging bag as described above. Also in this case, the film-like check nozzle can exhibit an excellent check function against the intrusion of outside air based on the automatic close sealing.

  As is clear from the above description, in the film-like check nozzle, in order to effectively exert its check function, it is important that the pair of front and back laminated plastic films constituting this can be strongly adhered to each other, For this purpose, it is necessary that the laminated plastic films have high flatness and high wettability.

  However, when the film-like check nozzle having the above function is used for a packaging bag processed at a high temperature such as a hot pack or a retort pouch, the thickness of the laminated plastic film constituting the film is large. Therefore, it is necessary to use a high-density polyethylene layer or polypropylene layer having heat resistance as the inner surface side and outer surface side sealant layers. However, such a sealant layer composed of a high-density polyethylene layer or a polypropylene layer is generally easy to stretch, and when opening the nozzle by tearing the nozzle with fingers, the opening film is stretched by the tearing force, and the laminated plastic There was a problem that the flatness between the films deteriorated.

  In addition, in the prior art, in order to improve the tear-opening property of the film-like check nozzle, it has been disclosed to form a guide rod on the base film layer at the planned opening position. If it is made thinner, the tensile strength of the portion is lowered, and there is a risk of breaking during handling, particularly when used in a hot pack or a retort pouch.

  In order to solve such problems, in the film check nozzle according to the present invention, the nozzle discharge passage is located at the planned opening position of the sealant layer (inner surface side sealant layer) on the inner surface side of the nozzle near the nozzle tip. One or a plurality of tear guide lines extending across the surface of the seal guide layer is provided, and according to this, the thickness of the sealant layer at the position where the tear guide lines are formed is reduced, and the film-like check nozzle can be opened. The required tearing force can be made sufficiently small, and the base film layer serving as the support substrate can maintain the same thickness, so that the tensile strength of the nozzle itself can be maintained. Therefore, according to the present invention, a film-like non-return nozzle formed by using a laminated plastic film obtained by laminating unstretchable polyethylene or polypropylene having heat resistance on the inner surface side and outer surface side sealant layers. Even if it exists, the effect that it can open easily with a small tearing force can be expected.

  Further, in the present invention, it is preferable that the tear induction line is formed not only on the inner surface side sealant layer surface but also on the surface of the sealant layer (outer surface side sealant layer) serving as the outer surface of the nozzle. The above effects can be further enhanced. At this time, the tear guide line formed on the outer surface side sealant layer surface is preferably a position corresponding to the position where the tear guide line is formed on the inner surface side sealant layer surface, whereby the tear guide line is formed. The film thickness (inner / outer surface side sealant layer thickness) is further reduced, and it becomes easier to tear and open.

  Further, in the present invention, since one or a plurality of tear guide lines are provided so as to cross the extraction passage of the film-like check nozzle, a large capacity can be obtained by opening along the tear guide lines. Even if the spout is large (the opening distance is long), such as a large bag, it is possible to accurately guide the traveling direction of the tear of the film check nozzle.

  In particular, in the present invention, since the rigidity of the laminated plastic film is reduced in the portion where the tear guide line is formed, the packaged product is pushed out from the spout by the spring back of the film after the packaged product is poured out. It is possible to suppress the occurrence of dripping.

  Furthermore, in the present invention, since the tip of the film-like check nozzle can be easily torn and opened with fingers, the tear mark does not rip, and the film at the opening position can be made sufficiently smooth. Therefore, the flatness between the two laminated plastic films on the front and back surfaces is improved and strongly adhered, and the check function can be effectively exhibited.

  The tear guide line can be provided not only on the inner surface side sealant layer surface of the laminated plastic film as described above, but also on the outer surface side sealant layer surface, and the film configuration and thickness of the laminated plastic film to be used, The above effects can be more effectively exhibited by appropriately selecting the surface and number of the sealant layers that form the tear guide lines depending on conditions such as the stiffness and the type of the package.

  Prior to forming the film-like non-return nozzle by fusing the outer peripheral edge portions of the pair of front and back laminated plastic films, the tear guide line is formed at a position near the nozzle tip (scheduled opening position) of the laminated plastic film. It is formed on the surface side sealant layer surface, preferably the inner / outer surface side sealant layer surface. According to this, since both ends of the tear guide wire are melted and crushed as the nozzle outer periphery fusion portion when forming the film check nozzle, the end of the guide wire is cut during handling. The sealing strength of the film check nozzle is not lowered.

  Moreover, the end portion of the tear guide line is melted and crushed as described above, but once the tear guide line is formed, the tear resistance is lower than the other parts. By pulling the position with fingers, the film-like check nozzle can be torn and opened. According to this, it is possible to expect an effect that it is not necessary to provide a tear-opening ridge such as a V notch at the nozzle outer peripheral edge portion.

  The tear guide line is preferably formed continuously or intermittently (perforated) by thinning roll teeth or laser beam irradiation. According to this, the width, length, and depth of the tear guide wire can be adjusted according to the type of the laminated plastic film, the bag volume, the type of the object to be packaged, and the like.

  A die roll cutter, a laser cutter, a cameron cutter, a leather cutter or the like can be used as the thinning roll tooth. These thinning roll teeth are preferably used after being heated to 40 to 180 ° C., and the heated thinning roll teeth are pressed against the tear-opening position at the tip of the film-like check nozzle to laminate the portions. Only the inner and outer surface side sealant layers of the plastic film can be reduced in thickness. When the heating temperature is less than 40 ° C., the inner / outer surface side sealant layer cannot be sufficiently melted. On the other hand, when the heating temperature exceeds 180 ° C., the inner / outer surface side sealant layer is not rolled. There is a possibility that the base film layer is melted.

  Moreover, it is preferable that the width | variety of the said tear guide line formed in the inner / outer surface side sealant layer surface of a laminated plastic film is 1 micrometer-2 mm / piece. This is because the film-like non-return nozzle of the present invention forms tear guide lines in advance at the required positions of the two front and back laminated plastic films, and then the two front and back films so that the guide lines overlap each other. And the outer peripheral edge portions are fused to each other. For this reason, the width of the tear guide line is 1 μm in consideration of the effects of errors in stacking and thermal strain during heat sealing so that the tear guide line on the front side and the tear guide line on the back side are always superimposed. On the other hand, when the width of the tear guide wire exceeds 2 mm, the tensile strength is lowered, and there is a risk of breaking during handling.

  In the present invention, the thickness of the sealant layer in the portion where the tear induction line is formed on the inner and outer surface side sealant layer surfaces as described above is 1/2 or less, preferably 2/3 or less of the other portions. It is preferable to reduce the thickness of the tear guide wire to a depth that bites into the base film layer. This is because if the thickness of the sealant layer on the inner and outer surface side of the part where the tear guide line is formed is more than 1/2 of the other part, the tear resistance cannot be reduced sufficiently, and the laminated plastic is This is because the film is stretched and is not easily cut, the flatness between the two laminated plastic films is lowered, and the check function cannot be effectively exhibited.

Hereinafter, embodiments of the film-like check nozzle of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of a film check nozzle according to the present invention.
1 in the figure indicates a film-like check nozzle, and this pouring nozzle 1 is, for example, a fusion part at a side part of the packaging bag body 2 indicated by an imaginary line in the figure, on the sealant layer on the inner surface thereof. The base end portion is fused and joined by an outermost sealant layer, preferably a sealant layer made of the same kind of resin material as the sealant layer of the packaging bag body 2.

  Here, the outer surface of the base end portion of the film-like check nozzle 1, for example, the wedge-shaped film-like check nozzle 1, is fused and joined to the inner surface of the upper side portion of the packaging bag body 2 of the flexible packaging bag, for example. In this case, in order to prevent mutual fusion of the inner surface side sealant layers of the film check nozzle 1, a higher melting point or non-heat-melting separation is provided inside the base end of the nozzle connected to the dispensing passage. By inserting a mold sheet, or by making the fusing temperatures of the respective sealant layers on the inner and outer surfaces of the film check nozzle 1 different from each other, for example, by changing the material or by changing the extrusion laminating conditions, or This can be achieved by making the melting point of the inner surface side sealant layer film of the film check nozzle 1 higher than that of the outer surface sealant layer film of the film check nozzle. Can.

  For example, as shown in FIG. 2, the laminated plastic film constituting the film check nozzle 1 has a thermoplastic base film layer 5, for example, a biaxially stretched polyethylene terephthalate layer of 10 to 15 μm, a nylon layer, etc. When the inner surface side sealant layer 6 and the outer surface side sealant layer 7 laminated on both sides are composed of three layers, for example, an unstretched polypropylene layer of 20 to 25 μm, a polyethylene layer, etc., the inner surface side [backing] sealant layer 6 Preferably, the outer surface side [surface material] sealant layer 7 has a melting point higher than the melting point of the outer surface side [surface material] sealant layer 7, and the outer surface side [surface material] sealant layer 7 has a heat seal temperature of the sealant layer of the packaging bag body 2. It is preferable to use a film that can be heat-sealed at a higher temperature. This is to prevent the inner surface side sealant layers 6 of the film-like check nozzle from being heat-sealed when the film-like check nozzle and the packaging bag body are fusion-bonded by heat sealing.

  In addition, the film-like non-return nozzle 1 has, for example, two laminated plastic films 4 having the structure shown in FIG. Can be configured by fusing each other as shown by hatching in FIG. 1, preferably by heat sealing, in each side portion excluding the base end side. .

  In such a film-like check nozzle 1, the length of the opening tip of the film-like check nozzle 1 extending substantially in the width direction (vertical direction) of the laminated plastic film 4, that is, the spout edge portion, is Regardless of the number of laminated plastic films 4, it is preferable that the thickness is about 5 to 100 mm. However, the “substantially width direction” herein refers to the tearing direction, and thus the extending direction of the check nozzle opening edge. This is because it may be inclined at an angle in the range of 0 to 15 ° with respect to the width direction of the plastic film 4. If the length of the opening of the film-like check nozzle 1 is less than 5 mm, the amount of dispensing is too small in relation to the volume of the bag body, whereas if it exceeds 100 mm, it is difficult to accurately specify the dispensing direction. Because it becomes.

  The film check nozzle 1 of the present invention has a tear guide wire 8 so as to cross the dispensing passage 3 of the film check nozzle 1 near the tip as shown in the embodiment of FIG. As shown in the enlarged sectional view along the line II-II in FIG. 1 (FIG. 3), the tear guide wire 8 has laminated plastic films 4 and 4 on both sides constituting the film-like check nozzle 1. On the surface of the 'inner surface side sealant layers 6 and 6', the front side tear guide line 8 and the back side tear guide line 8 'are provided (in the same position) so as to face each other.

  As shown in FIG. 3, the thickness of the laminated plastic films 4 and 4 ′ where the tear guide lines 8 and 8 ′ are formed is thinner than the other portions. Therefore, it is easy to pull the position with fingers. The base film layer 5 as a base material can be opened by tearing, and therefore the tensile strength is not lowered, and the base film layer 5 is not accidentally opened during handling.

  Also, the tear guide lines 8 and 8 'are formed at portions where tear marks are not stretched, so that the flatness between the laminated plastic films 4 and 4' on the front and back sides at the opening position is improved, and the portions are in close contact with each other. Therefore, the check function of the film-like check nozzle 1 can be effectively exhibited.

  In FIG. 3, the tear guide lines 8 and 8 ′ are formed only on the surface of the inner surface side sealant layers 6 and 6 ′. However, as shown in the embodiment of FIG. 4, the inner surface side sealant layers 6 and 6 are formed. When tear guide lines 8 and 8 'are provided on both of the outer sealant layers 7 and 7', the thickness of the laminated plastic films 4 and 4 'at the opening position is further reduced, and it is easy with a small tearing force. And the direction in which the tear proceeds can be reliably guided. In this case, the tear guide lines 8 and 8 ′ on the inner surface side sealant layer 6 surface and the tear guide lines 8 and 8 ′ on the outer surface side sealant layer 7 surface are formed at substantially the same positions. To do.

  Further, in the embodiment shown in FIGS. 3 and 4, three tear guide lines 8 and 8 ′ are provided on each surface, but the kind, thickness, stiffness, etc. of the laminated plastic films 4 and 4 ′ are provided. It is preferable to form one or more in accordance with the above.

  By the way, in the non-return nozzle 1 used for the packaging bag for retort packs, when polypropylene having heat resistance is used as the inner and outer surface side sealant layers 6 and 7 of the laminated plastic film 4 constituting the nozzle 1, polypropylene is used. Has a crystallinity higher than that of polyethylene and a strong bonding force, and therefore has a characteristic that it is easy to stretch and difficult to cut. Also for such a laminated plastic film 4, the tear guide wire 8 is formed on the inner surface side sealant layer 6 surface, preferably the inner / outer surface side sealant layers 6, 7 surface as described above. By reducing the thickness, the inner and outer surface side sealant layers 6 and 7 are not stretched during tearing, and can be easily opened with a small tearing force.

  In addition, the check nozzle 1 performs the check function after the inner package side sealant layers 6 and 6 'are brought into close contact with each other after the material to be packaged is poured. In the present invention, the tear guide wires 8 and 8' are formed. Since the rigidity of the laminated plastic films 4 and 4 ′ in the portion is reduced, the material to be packaged remaining in the dispensing passage 3 of the nozzle 1 is not pushed out by the spring back of the films 4 and 4 ′. Will not occur.

  In the present invention, the tear guide wires 8 and 8 'are formed on the inner surface side sealant layer 6 of the laminated plastic films 4 and 4' on the front and back sides, preferably on the inner and outer surfaces, before the film-like check nozzle 1 is formed. After forming on the surface of the side sealant layers 6 and 7, the laminated plastic films 4 and 4 ′ on the front and back are overlapped so that the tear guide lines 8 and 8 ′ overlap, and the outer peripheral edges are fused to each other to form a film A check nozzle 1 is formed. Therefore, as shown in FIG. 1, the end portions of the tear guide wires 8 and 8 ′ become the outer peripheral seal portion 12 of the film-like check nozzle 1, and the guide wires 8 and 8 ′ of that portion are melted and crushed. Become. Therefore, the strength of the outer peripheral seal portion 12 does not decrease due to the formation of the tear guide lines 8 and 8 ', and the tear guide lines 8 and 8' may be accidentally cut when the packaging bag is handled. Absent.

  As described above, the end portions of the tear guide wires 8 and 8 'are fused as the outer peripheral seal portion 12, but the tear resistance of the laminated plastic film of the portion is once changed to the tear guide wires 8 and 8'. By forming, it is weaker than other parts. Therefore, in the present invention, the film-like check nozzle 1 can be easily opened by pulling the outer peripheral seal portion 12 at the end position of the tear guide wires 8 and 8 ′ with fingers, There is no need to provide a guide rod such as a V-notch at the planned opening position of the outer peripheral seal portion 12.

  In addition, the tear guide lines 8 and 8 'are formed continuously or intermittently (perforated) on the laminated plastic film before the formation of the film check nozzle by thinning heating roll teeth or laser beam irradiation. can do. As a result, the width, length, depth, and the like of the guide wires 8, 8 'can be freely selected according to the type, thickness, stiffness, and the like of the laminated plastic films 4, 4'. The tear guide lines 8 and 8 ′ have a width (A) shown in FIG. 3 of 1 μm to 2 mm, and the depth is determined by the thickness (d) of the remaining sealant layer after the tear guide lines 8 and 8 ′ are formed. The sealant layer thickness (D) is preferably ½ or less.

  In addition, in such a film-like check nozzle, in order to exert its check function, it is preferable to make the adhesive force of the two laminated plastic films of the front and back constituting the film-like check nozzle more reliable, For this purpose, it is effective to apply a wetting process to the inner surface of the extraction passage 3 of the laminated plastic film constituting the check nozzle.

  This wetting treatment is a treatment that makes the adhesive force acting between the laminated plastic films more reliable and effectively exerts the above-described outside check function (preventing the entry of outside air into the bag). For example, PE Corona discharge treatment, UV ozone treatment, resin coating treatment, metal deposition treatment, electroless plating treatment, metal low-temperature thermal spraying treatment, plasma etching treatment, flame on the surface of the laminated plastic film sealant film made of PP, EAV, ionomer, etc. The wettability of the film can be improved by the synergistic effect of the physical surface modification of the film surface and the chemical surface modification by the generation of polar functional groups by applying a wetting process such as a treatment example. it can.

  In particular, in the present invention, it is preferable to form a wetting process on the inner surface of the extraction passage 3 in the vicinity including at least the formation positions of the tear guide lines 8 and 8 '. According to this, after the discharge of the object to be packaged from the opening of the film check nozzle 1 is finished, the object to be packaged interposed at the tip of the nozzle opening returns to the liquid so that it is sucked into the wetting treatment layer inside. The dripping can be effectively prevented.

  Further, in the film-like check nozzle 1 of this embodiment, a spire-like shape for preventing dripping is formed at the position of the lower edge of the tear-off guide lines 8 and 8 'somewhat closer to the base end side. The projection 9 is provided. The protrusion 9 causes the dripping generated from the spout of the film check nozzle 1 to flow down the protruding portion before reaching the side portion that will be located on the lower side of the packaging bag. The main body 2 and the inside of the outer container surrounding the main body portion 2 are not contaminated, and the possibility of dripping of the liquid to an unintended location can be effectively removed.

  In the present invention, at least the outer surface of the opening (pouring spout) of the film-like check nozzle 1, that is, the outer surface in the vicinity including the planned opening and the dripping prevention protrusion 9 are repellent. It is preferable to provide a coating layer 10 of an aqueous substance / oil repellent substance. When such a treatment is applied to the film-like check nozzle 1, so-called liquid breakage is improved when the packaging bag is returned to an upright position to stop the dispensing of the liquid package, It is possible to effectively prevent the drooping of the packaged item.

  As the water repellent substance, a water repellent coating agent made of silicone oil, fluorine resin, acrylic resin or amide resin is used, and as the oil repellent substance, oil repellent such as silicon resin, Teflon resin, silicon modified acrylic resin or the like is used. Using coating agents, urethane, acrylic, ester, nitrified cotton, amide, vinyl chloride, rubber, styrene, olefin, vinyl chloride, cellulose, phenol, etc. as binders Added.

  In the present invention, the reason for providing such a water-repellent / oil-repellent coating layer is, for example, when the liquid package has a low viscosity such as soy sauce or sake, the liquid package is applied to food. In order to prevent overhanging, after forming the spout, many of the square-shaped packaging bags were tilted little by little and the liquid packaging was formed with the tilted posture of the packaging bag. It is often dropped at an unintended location along the side that is lower than the spout, i.e., located below it, and sometimes the clothes can be soiled by liquid packaging. This is to prevent this.

  As a result, even if the liquid package has a high viscosity such as an oily dressing or salad oil, the liquid package is positioned below the spout opening near the tip of the film check nozzle in the pouring posture. By providing an oil-repellent layer on the outer surface of the side part that will be used, the packaging bag is tilted little by little, and when the liquid package is gradually poured out from the spout, the liquid-repellent property due to the oil-repellent layer By effectively preventing wetting by oil etc. of the side part that will be located on the lower side of the packaging bag, it is possible to effectively transfer the viscous liquid to unintended locations Can be removed.

  In the case of the present invention, the contact angle between such a water / oil repellent coating layer and a liquid article to be packaged, for example, soy sauce or oil, is preferably in the range of 100 to 170 °, whereby the vicinity of the spout It is possible to sufficiently prevent the liquid material from wrapping around the portion, and to further improve the accuracy of the dispensing.

  Moreover, in the film-like non-return nozzle 1 of this embodiment, as shown in FIG. 1, in the place adjacent to the lower edge part of the film-like non-return nozzle 1, especially the nozzle attachment base end side (packaging bag main body side). In addition, it is possible to provide a liquid storage portion 11 for controlling the amount to be dispensed so that the discharge flow is temporarily retained in this zone to prevent unintentional excessive pouring and to provide stable quantitative discharge. preferable.

  By adopting such a liquid reservoir 11, the liquid article to be packaged guided from the packaging bag body 2 to the dispensing passage 3 of the film check nozzle 1 is temporarily retained in the liquid reservoir 11 and discharged. Since the flow rate is generally lowered and then heads toward the spout, excessive spillage of the package can be avoided.

In this example, a film-like reverse film composed of a laminated plastic film having two layers, the inner surface side sealant layer (high density PE 10 μm), the base film layer (NY15 μm), and the outer surface side sealant layer (high density PE 15 μm). For the stop nozzle, a tear guide line is formed on the inner surface side sealant layer surface near the tip of the nozzle, and the cross-section at the opening position (outlet end) is opened with a laser microscope (Keyence). And VK9700).
Moreover, as a comparative example, a cross section of the opening position (outlet end portion) when an I notch is provided in the outer peripheral seal portion of a film check nozzle having the same film configuration and the I notch is used as a starting point for tearing and opening with fingers. Was observed. The result is shown in FIG.

  From the result of FIG. 5, in the film-like non-return nozzle of the comparative example, the inner and outer surface side sealant layers at the opening position greatly stretched and waved due to the tensile force at the time of opening. In this state, the flatness at the opening position between the laminated plastic films is lowered, the check function cannot be effectively exhibited, and problems such as intrusion of outside air and dripping may occur.

  On the other hand, in the example of the present invention, it can be seen that the inner and outer surface side sealant layers hardly stretched and were easily torn and opened with a small tearing force. According to this, a spout end part (tear mark) becomes linear, can maintain flatness in the opening position of a laminated plastic film, and can exhibit a non-return function effectively.

  The technique of the present invention can be used as a dispensing nozzle for a general liquid-filled package, particularly as a dispensing nozzle for a liquid-filled package used under high temperature conditions.

DESCRIPTION OF SYMBOLS 1 Film-like non-return nozzle 2 Packaging bag main body 3 Outflow passage 4, 4 'Laminated plastic film 5, 5' Base film layer 6, 6 'Inner sealant layer 7, 7' Outer sealant layer 8 Tear guide wire 9 For prevention of dripping Projection 10 Water / oil repellent coating layer 11 Liquid reservoir 12 Nozzle outer peripheral seal

Claims (12)

An inner surface side of a pair of laminated plastic films on the front and back, which are composed of a base film layer and an inner surface side sealant layer and an outer surface side sealant layer laminated so as to sandwich both sides of the base film layer In a flat film-like check nozzle for a soft packaging bag for filling a liquid material, the liquid material is interposed between the sealant layers to prevent the outside air from entering the bag.
One or a plurality of tears extending across the pouring passage on the inner surface side sealant layer surface of the pair of laminated plastic films constituting the nozzle on the inner surface side sealant layer surface at the planned tearing position near the nozzle tip A film-like non-return nozzle excellent in tear-opening characteristics, characterized by providing a guide wire.   One or more tear guide lines extending across the dispensing passage are provided at positions corresponding to the formation positions of the tear guide lines on the inner surface side sealant layer surface of the outer surface side sealant layer surface. The film-like check nozzle according to claim 1, which is excellent in tear openability.   The tear guide line is composed of a groove formed continuously or intermittently by pressing a thinning roll tooth against the surface of the inner surface side sealant layer and / or the outer surface side sealant layer. A film-like non-return nozzle having excellent tearing and opening properties according to claim 1 or 2.   The said thinning heating roll tooth | gear heats to 40-180 degreeC, The film-form non-return nozzle excellent in the tear openability of Claim 3 characterized by the above-mentioned.   3. The tear guide line is formed of a melt groove formed continuously or intermittently by irradiation of a laser beam on the surface of the inner surface side sealant layer and / or the outer surface side sealant layer. A film-like non-return nozzle having excellent tear openability as described in 1.   The width of the said tear guide wire is 1 micrometer-2 mm / 1, The film-like non-return nozzle excellent in the tear openability of any one of Claims 1-5 characterized by the above-mentioned.   The tear openability according to any one of claims 1 to 6, wherein the thickness of the laminated plastic film at the formation position of the tear guide line is 1/2 or less of the thickness of the other portion. Film check nozzle. A pair of soft laminated plastic films on the front and back, comprising a base film layer, and an inner surface side sealant layer and an outer surface side sealant layer laminated so as to sandwich both sides of the base film layer, and the inner surface side sealant layer The outer peripheral edge part is fused to each other, except for the base part connected to the side part of the bag body and the central part that forms the liquid pouring path, and the film is reversed. Prior to the formation of the stop nozzle, each of the pair of front and back laminated plastic films constituting the nozzle extends on the inner surface side sealant layer surface at a position near the nozzle tip, respectively, extending across the dispensing passage 1 or A method for forming a tear guide line for a film-like non-return nozzle, comprising forming a plurality of tear guide lines.   One or a plurality of tear guide lines extending across the dispensing passage are formed at positions corresponding to the formation positions of the tear guide lines on the inner surface side sealant layer surface of the outer surface side sealant layer surface. 9. A method for forming a tear guide wire for a film check nozzle according to claim 8.   The film according to claim 8 or 9, wherein the tear guide line is formed by pressing a thinning roll tooth against the surface of the inner surface side sealant layer and / or the outer surface side sealant layer. Of forming a tear guide wire for a check nozzle.   The method for forming a tear guide wire for a film check nozzle according to claim 10, wherein the thinning heating roll teeth are heated to 40 to 180 ° C.   The film tear check nozzle according to claim 8 or 9, wherein the tear guide line is formed by irradiating a surface of the inner surface side sealant layer and / or outer surface side sealant layer with a laser beam. Tearing guide line forming method.

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