JP2011148538A - Film-like non-returning nozzle and flexible packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film-like non-returning nozzle showing excellence in a self-seal checking function characteristic and a discharge characteristic, and to provide a flexible packaging bag having the same. <P>SOLUTION: In the flat film-like non-returning nozzle which is protrusively mounted on a side of a bag body, is made by welding the outer circumferential margin portion mutually excluding a base end connected to the bag body and the central portion forming a discharge passage of a liquid substance, generates an outside checking function to prevent the outside air from coming in the bag by the presence of the liquid substance in a minute space between superposed soft laminated plastic films, and is used for a soft packaging bag for filling with the liquid substance, wet treatment is conducted to only the portion near to the predetermined position of an opening excluding a portion serving as a nozzle base end side and the vicinity on the inner surface of either one or both of the laminated plastic films of the discharge passage. <P>COPYRIGHT: (C)2011,JPO&INPIT

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. The present invention relates to a flexible packaging bag formed by projecting a dispensing nozzle) and the film-like check nozzle.

Examples of the film-like check nozzle having the self-sealing check function and the flexible packaging bag including the same made of the above-mentioned soft laminated plastic film include those disclosed in Patent Documents 1 and 2 according to the proposals of the inventors.
JP 2005-15029 A JP-A-2005-59958

  The non-return function of the film-like non-return nozzle disclosed in Patent Documents 1 and 2 refers to the two laminated plastic films that are flat and in close contact with each other and face each other, and between the laminated plastic films that overlap. It is to exhibit a self-seal non-returning function that prevents the intrusion of outside air by allowing a liquid substance to always intervene in close contact with the pouring passage formed by the capillary action.

The film-like non-return nozzle disclosed in these documents and a flexible packaging bag including the same are substantially liquid by filling a liquid such as soy sauce or other liquid seasoning or salad oil in a liquid. It is used as a liquid-filled package that contains only the product to be packaged (filled in a gas-less state). And when pouring out a liquid package from this liquid filling package, the package has the characteristic that it does not touch air | atmosphere at all.
Therefore, since the article to be packaged hermetically sealed in such a packaging bag does not cause chemical changes such as oxidation, there is an advantage that it can be maintained in its original state for a long time.

  On the other hand, in these prior arts, the non-return function of the film-like non-return nozzle causes the inner surfaces of the film constituting the pour-out passage to be in close contact with each other, which makes it difficult to pour out the packaged material. The problem was that the drainage at the time of delivery worsened and dripping occurred.

  Therefore, the present invention aims at solving the above-mentioned problems of the prior art, and in particular, a film-like check nozzle excellent in self-seal check function characteristics and dispensing characteristics, and a flexible packaging bag including the same Is to provide.

  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 protrudes from the side portion of the bag body, and has a peripheral edge portion except for a base end portion connected to the bag body and a central portion that forms a liquid passage. For liquid filling, in which the liquids are fused together and the liquid is interposed in the minute gaps between the overlapping soft laminated plastic films to prevent the outside air from entering the bag. In the flat film-like check nozzle for a flexible packaging bag, the inner surface of one or both of the laminated passages of the pouring passages is a planned opening position excluding the portion serving as the nozzle base end and its vicinity. It is a film-like non-return nozzle characterized in that a wetting process is performed only on a close portion.

In the present invention, the film-like check nozzle is
(1) The range of the wetting treatment layer is within a range of 2/3 on the planned opening position side between the planned opening position and the nozzle base end side in the dispensing passage of the film-like check nozzle. To be given,
(2) The wetting treatment layer is formed from any one or more treatment layers of corona discharge treatment, UV ozone treatment, resin coating treatment, metal vapor deposition treatment, electroless plating treatment, metal low temperature spraying treatment, plasma etching treatment, and flame treatment. To become a,
(3) The outer surface of the film-like check nozzle has a coating layer of a water-repellent substance or an oil-repellent substance at least in the vicinity thereof including a planned opening position provided at the tip portion thereof,
However, this is a more preferable solution.

  Further, the present invention provides the base end of the flat film check nozzle with respect to the packaging bag main body of the liquid filling packaging bag, the inner surface of either the side, corner or top of the bag main body. We propose a flexible packaging bag that is fusion bonded and protruded.

In the present invention, the flexible packaging bag is
(1) The base end portion of the film-like non-return nozzle has a sealant layer facing to be bonded at a low temperature by a low melting point plastic film, and the inner surface of the dispensing passage is temporarily sealed,
(2) In the packaging bag body, the unsealed portion of either the front or back laminated film is constituted by a laminated film having at least an upper portion or a portion near the side edge on the film-like check nozzle side having a concavo-convex structure. That
(3) The concavo-convex structure formed on the laminated film is embossed, blasted, knurled, wrinkled, vertical / horizontal striped into one or both of the front and back laminated films into a planar shape, a striped shape, and a striped shape. Applied to be partly or entirely patterned,
(4) A self-supporting bottom is provided at the lower end of the packaging bag body,
(5) The packaging bag body is a three-sided seal free-standing bag excluding the free-standing bottom, the standing figure is flat at the top, and the bottom is cylindrical.
However, this is a more preferable solution.

In the film-like non-return nozzle of the present invention, by providing a wetting treatment layer on the inner surface of the dispensing passage, a capillary action is formed between two superposed soft laminated plastic films forming the film-like non-return nozzle. Liquid packaging can always be interposed, and the self-sealing check function of the film check nozzle can be more reliably exhibited by the high adhesion force derived from the intermolecular force generated between the films. Can do.
In particular, in the present invention, the film-like check nozzle is provided at a predetermined position by providing the wetting layer as described above only in the portion near the planned opening position except for the portion serving as the nozzle base end and the vicinity thereof. Even after opening and opening (opening the packaging bag formed by protruding the nozzle on the packaging bag body), both the nozzle and the packaging bag body flow back into the bag with air, etc. This prevents the reverse inflow without incurring inflowing air, and keeps the package in the bag for a long time, especially in the amount of liquid package. Smooth discharge can be ensured even when the discharge pressure is reduced due to a decrease in the amount of water.
The adhesion between the laminated plastic films is relaxed, and smooth pouring can be performed to the end of the package.

  In particular, in the present invention, the formation range of the wetting treatment is limited to a range of 2/3 on the planned opening position side between the planned opening position and the portion serving as the nozzle base end side, thereby forming the dispensing passage. The adhesion between the two front and back laminated plastic films at the entrance is moderately relaxed, effectively exerting the non-return function, and at the same time assisting the discharge action of the package and smoothly to the end You will be able to pour out. In particular, the formation range of the wetting treatment layer is preferably determined by the wettability of the packaged object, and in the case of low wettability such as water, 2 from the nozzle opening planned position to the base end side part. / 3 range or the range of the vicinity of the position excluding the portion to be the opening position and the base end side of the nozzle. On the other hand, in the case of high wettability such as soy sauce, the base end side is from the nozzle opening planned position. By forming it in the range of 1/2 to the portion, it is possible to enhance the dispensing characteristics while effectively exhibiting the check function.

  In addition, according to the present invention, since at least the planned opening position (spout spout) of the film-like check nozzle is excellent in water repellency and oil repellency, it is possible to effectively prevent dripping after discharging the liquid package. The user's hand and fingers are not soiled, and even if dripping occurs, the dripping is transmitted through a spire-like protrusion provided on the lower edge of the film check nozzle. Therefore, it is possible to prevent the film-like check nozzle from being transferred from the lower edge portion to the bag main body portion.

  According to the present invention, the inner surface of the base end portion (inlet portion) of the film-like check nozzle is temporarily sealed by low-temperature fusion processing, so that an unexpected force is applied to the nozzle portion during handling or the like. Even in such a case, it is possible to provide a flexible packaging bag including a film-like check nozzle that does not impair the check function characteristics.

  According to the present invention, at least a part of the laminated film constituting the bag body is preferably provided with a striped uneven structure, so that smooth pouring can be performed at any time during re-pouring. Even when the bag body is crushed and deformed due to the non-return function, pouring can be easily performed to the end.

  Moreover, according to this invention, it is possible to make a flexible packaging bag self-support by providing the bottom part for self-supporting at the lower end of a bag main body, Furthermore, a bag main-body part consists of a three-way sealing bag except the bottom part for self-supporting. Therefore, even after the liquid package is filled in the bag body with a seal in the liquid, the standing shape can maintain a flat shape at the upper part with respect to the cylindrical shape at the lower part (securing the filling space). Therefore, the check function of the film check nozzle can be effectively exhibited.

It is a figure which shows one Embodiment of the flexible packaging bag which concerns on this invention. It is an expanded sectional view of the opening opening position of the film-like check nozzle concerning the present invention. It is a figure which shows the state which provided the wetting process layer in the extraction channel | path inner surface of the film-like non-return nozzle which concerns on this invention. It is a basic diagram which illustrates the uneven | corrugated processing area | region provided in the packaging bag main body of the flexible packaging bag which concerns on this invention. It is an expanded sectional view of an uneven structure. It is a front view which shows other one Embodiment of the flexible packaging bag which concerns on this invention.

  The film-like non-return nozzle according to the present invention having a self-seal non-return function for automatically preventing the outside air from entering the bag is a thermoplastic, uniaxial or biaxially stretched base film layer, and either On the other hand, comprising two or three layers of a soft laminated plastic film (hereinafter described in the example of three layers) composed of a sealant layer laminated so as to sandwich both sides thereof, and the soft laminated plastic film as front and back The soft laminated plastic films on each side, for example, two of the above-mentioned sealant layers facing each other in a pair of soft laminated plastic films, or one soft laminated plastic film folded back in half width, The sealant layers facing each other are connected to the base end of the packaging bag body and the liquid material is poured. The outer peripheral portion excluding the central portion that becomes the passage is formed so as to have a substantially wedge shape as a whole by fusing flatly so as not to wrinkle each other by heat seal, high frequency seal, impulse seal or the like. .

  The non-return function of the film-like non-return nozzle is, as will be described in detail later, when the article to be packaged is poured out from the packaging bag, replacing the article to be packaged, such as air. An outer non-return function that prevents the package body from entering the bag body filled with the package object. For example, the package object is discharged from the bag body as in the check nozzle of JP-A-2005-52596. This is different from the inner check function that prevents the problem.

  This film-like non-return nozzle has, for example, a sealant layer which is located on the outer surface of the nozzle, for example, an olefin such as various non-stretched PE layers, PP layers, metallocene-catalyzed polyethylene layers, in the base end portion. A sealant layer on the inner surface of the packaging bag body consisting of a soft laminated plastic film (mainly two layers) through a resin-based resin layer, an ethylene vinyl acetate copolymer layer, an ethylene ethyl acrylate copolymer layer, an ionomer layer, etc. (preferably Is a flexible packaging provided with a film-like non-return nozzle that is simply, quickly and surely fused and bonded in a state protruding from the packaging bag body by, for example, heat sealing to the same kind of sealant layer) Used as a bag.

  Since this film check nozzle is not subject to the load of the package, a thin three-layer laminated plastic film of PE20 / NY15 / PE20 is suitable. The check action is better. In particular, a laminated plastic film with two front and back surfaces has a higher flatness (flatness) and a higher non-return effect can be obtained, and the gap during polymerization of the two front and back plastic films may be about 2 μm to 300 μm. Necessary.

  The liquid packaged material filled in the packaging bag having the film-like check nozzle of the present invention is poured into a predetermined opening portion (a tearing portion formed near the tip of the film-like check nozzle). This is done by cutting off the leading edge of the guide rod or notch with your fingers and opening it. That is, after the check nozzle is opened, the liquid package is required by tilting the main body portion of the packaging bag so that the opening (spout) of the film-like check nozzle faces downward. Is dispensed.

  In this case, the film-like check nozzle made of a soft laminated plastic film has a liquid substance constantly interposed by pressurizing the body portion of the packaging bag by the action of the water head pressure of the liquid package or the finger. The resulting intermolecular force between the film, liquid and film resists the front and back sides, creates a large gap, opens the dispensing passage, and allows the liquid package to be dispensed. Become.

  Note that when the liquid package is poured out through the opening of the film check nozzle (pour spout), the bag body portion made of a soft laminated film is in spite of the liquid package being poured out. The self-sealing check function of the check nozzle (the air does not enter the bag body instead of the liquid package that has been poured out), so the outside air is not sucked (backflow). Are successively contracted or crushed by an amount corresponding to the extracted volume.

  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.

  As is clear from the above explanation, as long as liquid material remains in the bag body on the inner surface (pour-out passage) of the two laminated plastic films constituting this film-like non-return nozzle, it is caused by capillary action. A liquid substance is always present. 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 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 exhibits an excellent check function against the intrusion of outside air based on the automatic close sealing.

  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 constituting the film-like check nozzle more reliable. It is effective to apply a wetting treatment to the inner surface of the dispensing passage 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 (prevents the entry of outside air into the bag). In order to increase the activity of the film surface by a physical method, a chemical method, a mechanical method, etc. on the surface of a sealant film of a laminated film composed of a film having a particularly low polarity and low activity, such as physical In a typical method, corona discharge treatment, UV ozone treatment, resin coating treatment surface, metal deposition treatment, electroless plating treatment, metal low temperature spraying treatment, plasma etching treatment, flame treatment, etc. Synergistic effect of physical surface modification of film surface and surface modification by polar functional group generation and chemical surface tension by polar functional group generation More, it is possible to improve the wettability of the film. In addition, this treatment may be a method of treating the film surface with an acid or alkali as defined in JIS K6843-3: 1999, or a mechanical method such as mat processing.

  For example, among the physical wetting processes described above, the corona discharge process refers to the surface of the sample passing between the dielectric and the electrode by generating a corona by applying a high frequency and high voltage between the dielectric and the insulated electrode. Is a method of processing. The mechanism for modifying the surface is considered as follows. That is, the oxygen present in the air is activated by the generated corona, and this oxygen cuts and enters the film molecular chain to generate polar groups (C═O, COOH, C—OH, etc.) and strong. Unevenness is generated on the sample surface by collision of electron energy. As a result, the surface strength and adhesiveness of the film are improved.

Therefore, the inventors experimented on a typical corona discharge for the action effect of the wetting treatment layer. Table 1 shows the results. That is, for a film-like check nozzle having a three-layer structure of LLDPE15 / PET12 / LLDPE20, corona discharge treatment (discharge condition: discharge amount = 81.7 W · min / m) on the inner surface (LLDPE) of the sealant film. ² ) was performed. When the wetting tension of the film was measured with a wetting reagent, the film was 32 N / m before treatment and 56 N / m after treatment, and the contact angle with water is as shown in Table 1. The cohesive force of the liquid, that is, the surface tension (S) was weakened, and in all cases, the contact angle (θ) was clearly reduced and the wettability of the film was improved, and the effectiveness of this treatment was confirmed. .

However, while the wetting treatment ensures the adhesion between the laminated plastic films, if the effect is too strong, the filled liquid package is tilted to form a film. If you try to pour out again through the check nozzle and there is a sufficient amount of liquid (liquid height) in the bag body (when the head pressure is high), smooth pour out is possible. However, when the amount of liquid in the bag decreases, the water head pressure decreases, and the pouring pressure loses the adhesive force due to the capillary action between the laminated plastic films, preventing smooth pouring and liquid return. Become so.
In addition, when an attempt is made to discharge an object to be packed while pressurizing the bag body while the laminated plastic films are in close contact with each other as described above, an unintended excessive amount is discharged or the object to be wrapped is scattered. There is a problem that stable dispensing cannot be ensured.

  Therefore, in the present invention, in order to eliminate such adverse effects, the adhesion force between the laminated plastic films based on the capillary action of the film-like check nozzle is slightly relaxed and a discharge passage is secured, that is, the film-like reverse. In order to ease the adhesion between the films while maintaining the check function of the stop nozzle, the wetting treatment layer is not the entire inner surface of the film check nozzle but the base end side of the check nozzle Proposed to be provided on the inner surface of the portion near the planned opening position, excluding the portion and its vicinity.

  As a result, the adhesion force between the laminated plastic films of the film-like check nozzle is improved and the adhesion force is moderated moderately, and the packaged article can be always poured out smoothly. In addition, since the wetting layer is provided at the planned opening position, the packaged material intervening at the tip of the nozzle opening returns to the liquid so that it is sucked into the inner wetting layer after the discharge is completed. Can be effectively prevented.

  Further, the wetting layer is preferably provided in a portion of 2/3 or less, more preferably 1/2 or less of the planned opening position side of the film-like non-return nozzle from the planned opening position side. This is because when the range of the wetting treatment layer exceeds the above range (over 2/3), the adhesive force between the laminated plastic films becomes too strong, and when the discharge pressure is reduced, the object to be packaged is It is because there exists a possibility that it cannot pour out smoothly from a front-end | tip opening.

  In addition, the non-return function (adhesion force between films) of a film-like non-return nozzle is greatly influenced not only by the wettability of the laminated plastic film constituting the nozzle but also by the wettability of the package. Therefore, it is preferable to determine the formation range of the wetting treatment layer according to the type of the object to be packaged.For example, in the case of an object to be packaged that has a high salt content such as soy sauce and dashi and has high wettability, In the case of an article to be packaged having low (less) salt content and low wettability like water and drinking water, the base end from the nozzle opening planned position It is preferable to set the range excluding 2/3 to the side portion or the portion to be the nozzle base end side and the vicinity thereof.

  In addition, the opening tip part of the said film-like non-return nozzle extended in the substantially width direction (up-down direction) of a laminated plastic film, ie, the length of a spout edge part, is 5-5 irrespective of the lamination | stacking number of the laminated plastic film. Although it is preferable that the width is about 100 mm, the “substantially width direction” herein refers to the tear direction, and thus the extension direction of the check nozzle opening edge, as described above, and the width of the laminated plastic film. This is because it may be inclined at an angle in the range of 0 to 15 ° with respect to the direction. If the length of the check nozzle opening is less than 5 mm, the dispensing amount is too small in relation to the volume of the bag body, while if it exceeds 100 mm, it is difficult to accurately specify the dispensing direction.

  In the present invention, a coating layer of a water-repellent / oil-repellent substance is provided on at least the outer surface of the opening (pouring) of the film-like check nozzle, that is, the outer surface in the vicinity including the planned opening. It is preferable. When such a treatment is applied to the film check nozzle, the so-called liquid breakage is improved when the packaging bag is returned to the upright position to stop the dispensing of the liquid package. Unexpected dripping of the package can be effectively prevented.

  As the water repellent substance, a water repellent coating agent made of silicone oil, fluorine resin, acrylic resin or amide resin is used. As the oil repellent substance, silicon resin or Teflon resin (Teflon: US Dupont registered trademark), Using oil-repellent coating agents such as silicone-modified acrylic resins, urethane, acrylic, ester, nitrified cotton, amide, vinyl chloride, rubber, styrene, olefin, vinyl chloride, cellulose, A phenolic resin or the like is added as a binder.

  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.

  The inventors examined the influence of the presence or absence of the water-repellent layer on the liquid breakage of the liquid package for the film-like check nozzle of the present invention. That is, with respect to the film-like check nozzle of a flexible packaging bag having a laminated structure of a 15 μm-thick biaxially stretched nylon base film and a 50 μm-thick linear low-density polyethylene sealant layer, the planned opening portion (the planned outlet portion) ) To the bottom edge of the bag body side, two types are provided: a water repellent layer coated with silicone oil as a coating agent (invention compatible example), and a water repellent layer not provided (comparative example) did. Then, in these two types of flexible packaging bags, Koikuchi soy sauce (Kikkoman Co., Ltd.) is sealed as a liquid package, and with the spout opened, it is fixed to a tilt angle measuring device and 50 mm / min. Was gradually tilted to measure the angle (α) at which the liquid package began to be poured.

  From the results in Table 2, the pouring start angle is not affected by the presence or absence of the water-repellent layer, but in the comparative example, in the comparative example, the dripping occurs at the pouring start angle of the liquid package. On the other hand, it has been confirmed that the presence of the water-repellent layer can suppress dripping of the liquid packaging material up to a tight (smaller) tilt angle than the pouring start angle of the liquid package.

  Furthermore, in the present invention, a spire-shaped dripping prevention protrusion may be provided at a position deviated from the planned opening portion (spout port) of the lower edge portion of the film-like check nozzle toward the base end side. Due to the dripping prevention protrusion, the dripping generated from the spout of the film-like check nozzle will flow down the protruding portion before reaching the side portion that will be located on the lower side of the packaging bag. In addition, the bag main body portion and the inside of the outer container surrounding the bag main body portion are not contaminated, and it is possible to effectively eliminate the possibility of dripping of the liquid to an unintended location. In addition, it is preferable to provide the water-repellent layer or the oil-repellent layer on the outer surface of the spire-shaped dripping prevention protrusion, so that wetting of the protrusion due to dripping can be instantaneously prevented.

  By the way, this film-like non-return nozzle is used for, for example, fusion-bonding the outer surface of the base end of the wedge-shaped non-return nozzle to the inner surface of the upper side portion of the bag body of the flexible packaging bag, for example. In order to prevent mutual fusion (sealant layers) on the inner surface of the film-like check nozzle, a release sheet having a higher melting point or not thermally melting is provided on the inner side of the base end of the nozzle connected to the dispensing passage. Insertion, the method of making the sealing temperature of each sealant layer on the inner and outer surfaces of the film check nozzle different from each other, for example, by changing the material or by changing the extrusion laminating conditions, or the film check For example, the melting point of the sealant layer film on the inner surface of the nozzle is set higher than that of the sealant layer film on the outer surface of the film check nozzle.

  For example, the inner side [backing] sealant film is a thermoplastic resin such as polypropylene or polyethylene, and preferably has a melting point about 20 ° C. higher than the melting point of the outer side [front material]. It is desirable to use a film that can be heat sealed at a temperature higher than the heat seal temperature of the sealant layer of the packaging bag body. This is to prevent the sealant films on the inner surface of the film-like check nozzle from being heat-sealed when the film-like check nozzle and the bag body are fusion-bonded by heat sealing.

  In addition, it is typical that the film-like check nozzle of the present invention has a protruding length from the bag body X = about 30 to 100 mm and a nozzle width (a tear opening position) Y = about 20 to 80 mm. is there.

  Here, the film structure of the packaging bag main body for the flexible packaging bag of the present invention includes a base film layer located on the outer surface thereof and a sealant layer located on the inner surface respectively as a film-like check nozzle. The same kind of base film layer and sealant layer can be used. When the film-like check nozzle and the packaging bag body are formed separately, an appropriate intermediate layer may be interposed between the base film layer and the sealant layer. Preferably, the sealant layer forming the inner surface of the bag body made of the soft laminated film is made of the same kind of resin material as the outermost sealant layer of the check nozzle. According to this, the fusion-bonding strength between the check nozzle and the bag body can be sufficiently increased.

  By the way, the film-like check nozzle made of a flat, soft laminated plastic film having a layer structure of three or more layers, and the respective sealant layers of the packaging bag body for fusion-bonding the same are both melt extruded laminates to the base film layer. It can be laminated by a method, a dry laminating method, an extrusion laminating method, a coextrusion laminating method or the like.

  Further, for example, a uniaxial or biaxially stretched base film of a laminated film having a two-layer or three-layer structure suitable for use in a packaging bag body is a polyethylene terephthalate film layer (PET layer) having a thickness of 8 to 30 μm or nylon. It is preferable to comprise a resin film layer (NY layer), ethylene vinyl alcohol (EVOH), or the like. On the other hand, the sealant layer of the laminated film used for the packaging bag body is preferably composed of an unstretched PE layer or PP layer having a thickness of 10 to 60 μm, an EVA layer, an ionomer layer, an EVOH layer, or the like.

  That is, the PET layer and the NY layer as the base film layer are preferable for exhibiting excellent water vapor impermeability and high gas barrier properties, and the PE layer and the PP layer as the sealant layer have a relatively low temperature. It is excellent in improving heat sealability and improving the seal strength.

  By the way, when the thickness of the base film layer of the packaging bag body is less than 8 μm, water vapor impermeability, gas barrier properties and the like may be insufficient. On the other hand, when the thickness exceeds 30 μm, the laminated film is bent. There is a possibility that the strength becomes too large and the adhesion of the dispensing passage on the inner surface of the check nozzle after the dispensing of the packaged article is stopped is impaired. Moreover, about the sealant layer, when the thickness is less than 10 μm, there is a possibility that sufficient seal strength cannot be secured, and when it exceeds 60 μm, the bending strength of the laminated film may be excessively increased. As long as this thickness is compensated in total, the sealant layer can be composed of two or more films.

  Moreover, as a laminated film used for a packaging bag main body, since a fixed amount of liquid material is filled, a strong film is required. In the present invention, the bending strength per unit width (15 mm) of the laminated film, in other words, the waist is measured as described above in FIG. 10 of JP-A-2005-59958. It is preferable that the value measured using the apparatus (Mini Bear Co., Ltd. load cell UL-100GR) is about 40 to 300 mN. If the waist is less than 40 mN, the stability of the packaging bag itself is inferior to the stability of the packaging bag itself, and the strength of the packaging bag itself cannot be denied. There may be a shortage. On the other hand, if it exceeds 300 mN, the entire check function including the film check nozzle may be lowered regardless of the laminated structure of the laminated film.

As the flexible packaging bag formed by projecting the above-described film-like check nozzle to the packaging bag body having such a film configuration, it corresponds to the case of repeated dispensing, particularly in the case of re-dispensing. However, as in the first case, it is desirable to allow a predetermined amount of smooth and controlled pouring.
Therefore, in the present invention, the inner surface of at least one of the packaging bag main body has a concavo-convex structure, that is, the respective seals (horizontal seal, vertical seal, seal between the nozzle and the main body for the front and back laminated films) , And the peripheral portion of the nozzle) have a concavo-convex structure that has been subjected to any of roughening processing such as embossing, blasting, knurling, random wrinkling, vertical / horizontal stripe processing, etc. It is preferable to use one. The reason for removing the seal portion is that if the seal portion is uneven, a seal failure occurs.

  The reason for forming such a concavo-convex structure on the packaging bag body is that not only the non-returning action of the film-like non-return nozzle, but also the liquid non-wrapping object is poured out by the action of the film-like non-return nozzle, Also in the packaging bag main body, the intrusion (backflow) of the outside air is prevented, and a capillary action acts between these laminated plastic films under the presence of a liquid substance, resulting in a tightly adhered state (return action). In particular, the inside of the packaging bag body is in close contact with the volume of the liquid material that has been poured out due to shrinkage of the film or crushing deformation of the packaging bag body.

  As a result, when filling the liquid package to be poured again through the film-like check nozzle, when there is a sufficient amount of liquid (liquid height) in the packaging bag body (water head pressure is When large, the smooth pouring is compensated to some extent, but when the amount of liquid in the bag decreases, the water head pressure decreases, and the pouring pressure loses the adhesive force due to the capillary action between the laminated plastic films. Smooth pouring and liquid return become impeded.

  In particular, if the amount of liquid in the filled package is reduced, wrinkles are generated in the packaging bag body, which causes a wetting action, the liquid flow stagnates, and the liquid flow path is cut off, making it difficult to smoothly pour out. In this case, if the pressure applied to the bag body is increased, an unintended excessive amount may be discharged, and stable dispensing cannot be ensured.

  In order to eliminate such adverse effects, the present invention slightly relaxes the adhesive force of the laminated plastic film based on the capillary action in the vertical and horizontal ranges at least in the vicinity of the film-like check nozzle of the packaging bag body, In order to prevent stagnation, stagnation and clogging, and to secure a flow path, that is, to reduce the adhesion due to the capillary action generated in the packaging bag body without reducing the check action of the film check nozzle part Therefore, it is preferable that at least one of the laminated films on the front and back of the packaging bag body is preferably provided with a concavo-convex structure composed of a linear or curved stripe pattern, and the capillary action is weakened particularly in the packaging bag body portion. Like that.

  The concavo-convex structure to be added to the laminated film is such that the gap between the laminated films on the front and back of the packaging bag body (excluding the vertical seal, horizontal seal, and the joined seal portion between the check nozzle and the main body), that is, the thickness of the liquid layer Usually, the adhesive force based on the capillary action described above is generated at about 2 to 5 μm, but one or both of the laminated films are embossed, for example, so that the gap between the films is 20 μm or more, preferably 30 μm. As described above, the unevenness is more preferably 50 μm or more. In this case, the capillary action is reduced, resulting in a decrease in the adhesion between the laminated films. As a result, at least at the location where this concavo-convex structure is provided, the flow path is always secured, and even if the amount of liquid in the bag is extremely small, the liquid packaged item is always smooth. Pouring is guaranteed.

  The above uneven processing is preferably processing that gives an irregular pattern in addition to a regular pattern using an embossing roll (Japanese Patent Laid-Open No. 2008-12669) having an uneven pattern such as a cylinder or a prism. Further, in place of such embossing, random wrinkling, blasting, knurling, vertical and horizontal stripes may be applied. As illustrated in the cross-sectional view of the stripe-shaped uneven structure in FIG. 5A and the dimple-shaped uneven structure in FIG. 5B, these have a constant gap G of about 20 μm so that the uneven positions are shifted and fitted. A combination is desirable to form. For example, in a bag making machine, a hot roll (70 to 80 ° C.) is formed before bag making (before vertical sealing) or after bag making.

  The inventors tilted a flexible packaging bag filled with soy sauce as a material to be packaged into a packaging bag body having a laminated film structure of NY15 vapor deposition surface / PET12 vapor deposition surface / XA-HD40, and the liquid comes out. An experiment was conducted to measure the remaining amount when it disappeared. As a result, as shown in Table 3, it was found that the effect was remarkable when the laminated film subjected to the uneven processing was used. In this experiment, in the vicinity of the film-like check nozzle of the packaging bag main body, a comparison was made between the one provided with a striped uneven pattern and the one provided with an embossed uneven pattern and the packaging bag main body not subjected to the uneven processing. . As a result, it was found that in the example suitable for the present invention, the remaining amount is small, it can be used up to the end, and the pouring can be performed smoothly.

  In such a flexible packaging bag of the present invention, the sealant layer on the outer surface side of the film check nozzle has a low melting point, and the base end portion thereof is the side portion of the packaging bag body, most of which is the upper end. By projecting from the side of the part, the sealant layer on the inner surface of the bag body is fusion bonded, while the sealant layer on the inner surface side of the film check nozzle is made of a high melting point, for example, The base end of the film-like check nozzle is bonded to the inner surface of the bag body by fusion bonding, and the adhesive strength is less than half of the original heat seal strength, and the temperature is relatively low. A temporary sealing portion that has been temporarily fused with is preferable.

  Here, the temporary sealing portion by low-temperature temporary fusion reduces at least one of the heating temperature, the applied pressure, and the pressurization time of the heat sealing means as compared with the case where a complete fusion bonded portion is formed. Can be realized.

  By the way, in the formation of the temporary sealing portion, the formation position of the film-like check nozzle can be a position corresponding to the fusion-bonding position to the packaging bag body. The position may be slightly deviated to the inside of the packaging bag body from the corresponding position, or conversely, the position may be somewhat deviated to the outside of the packaging bag body from the corresponding position. And in any of these cases, the portion for forming the package dispensing passage having a length (about 5 to 80 mm) sufficient for the film-like check nozzle to perform its original function is set at a low temperature. It is necessary to remain on the outside of the temporarily fused portion, that is, the temporarily sealed portion.

  Here, in forming the temporary sealing portion, it is necessary to use a high melting point sealant layer and a low melting point sealant layer for the film check nozzle. It is preferable that the low-melting polyethylene including the low-density polyethylene is formed, or that the high-melting-point sealant layer is formed of medium-density or high-density polyethylene, and the low-melting-point sealant layer is formed of low-density polyethylene.

  In addition, the selection of the high or low melting point of the polyethylene made of the same material can be realized, for example, by mutually changing the extrusion laminating conditions and the like when laminating the sealant layers.

  As described above, the temporary sealing portion is provided at the base end portion of the film-like check nozzle at or near the fusion-bonding position of the film-like check nozzle to the packaging bag main body, so that the packaging bag is provided. The liquid packaged product that was filled and packaged was reliably prevented from flowing from the temporary sealing portion to the tip of the check nozzle, and the packaged product was heated to 50 to 100 ° C. However, most of the packaged article extraction passage of the film check nozzle is sufficiently protected from permanent deformation in the direction in which the extraction passage is inflated.

  Accordingly, the portion of the film-like check nozzle on the tip side from the temporary sealing portion can always sufficiently exhibit the function of the film-like check nozzle, and when the article to be packaged is poured out from the packaging bag. Further, the intrusion of outside air into the bag body can be sufficiently prevented, and the self-seal non-return function when the packaged material is stopped can be reliably exhibited.

  By the way, when the packaged material in the bag is cooled to near normal temperature, the packaged product is temporarily sealed by applying a load in the thickness direction of the packaging bag, for example. In addition to opening the stopper, the tip of the film check nozzle is broken or cut off to form a dispensing opening, and in this state, the packaging bag is tilted so that the dispensing opening is directed downward. The posture.

  Here, since the other fusion-bonded portions of the packaging bag excluding the temporary sealing portion are heat-sealed with, for example, twice the strength of the temporary sealing portion, the temporary sealing portion is opened. Even if the necessary load is applied, no unexpected bag breaking will occur.

  For this reason, the film-like check nozzle portion that is not subjected to the full deformation due to the heated packaged object prevents the intrusion of outside air into the packaging bag body due to the extraction of the packaged object in the bag. It is possible to effectively prevent the pouring opening from being opened under the necessary and sufficient condition under the crushing deformation. In addition, when stopping the pouring of the packaging bag based on the return to the standing posture, the outside air into the main body of the packaging bag is recovered by the self-seal check function by returning the pouring nozzle part wet to the package to the original shape. Can be surely prevented.

  Here, when both the high melting point sealant layer and the low melting point sealant layer are formed of low density polyethylene, or the high melting point sealant layer is formed of medium density or high density polyethylene, and the low melting point sealant layer is formed of low density polyethylene. In any case, it is possible to easily and easily realize the temporary sealing having the sealing strength as expected and the required fusion bonding to the film check nozzle.

In addition, the heat sealing strength of the temporary sealing portion is in the range of 0.3 to 3 (N / 15 mm), particularly 0.7 to 1 (N / 15 mm). While preventing the opening, it is preferable to open the temporary sealing portion intentionally without affecting the other fusion bonded portions.
That is, if it is less than 0.3 (N / 15 mm), there is a possibility that unintentional opening of the temporarily sealed portion may occur in relation to the capacity of the packaged liquid in the heated state, If it exceeds 3 (N / 15 mm), the load required to open the temporary sealing portion may have an unexpected influence (bag breaking or opening) on other fusion bonded portions.

By the way, the load for opening the temporary sealing portion may be in the range of 50 to 350 (N), particularly 100 to 200 (N), without incurring bag breakage at other locations including the sealing portion, This is necessary to prevent accidental opening during transportation and work.
That is, when the opening load is less than 50 (N), there is a possibility that the temporary sealing portion may be opened by the lower packaging bag due to the stacking of the packaging bags filled and packed with the objects to be packaged. ) Or the heat seal strength is too high, other fusion bonded parts may be affected by the load required to open the temporary sealing part.

  According to the researches of the present inventors, for example, the base end portion of the film-like check nozzle is temporarily sealed at the upper side portion of the soft packaging bag body (NY15 / PET12 / LLDPE40) by low-temperature fusion. In such a case, the laminated structure of the film of the film-like non-return nozzle has a linear low density polyethylene layer (low melting point sealant layer) / biaxially stretched polyethylene terephthalate layer / linear low density polyethylene layer (high The heat seal strength of the temporary sealing part (N / 15 mm) when this laminated film was heated and pressurized at a cylinder pressure of 300 kPa for 3 seconds with a heat sealer with a cylinder using the heat sheet temperature as a parameter. In a tensile tester (TENSILON RTG-1300) under the conditions of a tensile speed of 200 mm / min and a film width of 15 mm. It was boss. The results are shown in Table 4.

  Moreover, in the flexible packaging bag of this invention, the bottom part for self-supporting may be provided in the lower end of a packaging bag main body, and you may enable it to become self-supporting. In this case, it is preferable that the packaging bag body part is composed of a three-sided seal bag excluding the bottom part for self-supporting, and the reason is that a vertical seal is applied to the left and right side edges of the packaging bag body part to Even after filling the liquid package with gas-less filling, such as by filling with a seal in liquid, it is possible to maintain the standing shape in a flat and flat shape at the top, that is, the lamination of the front and back two sheets constituting the film check nozzle The flatness (flatness) of the plastic film is increased, which guarantees the check function of the film check nozzle and ensures that the check function after the liquid package is poured out is maintained. This is because it works effectively.

  Next, specific forms of the film check nozzle and the flexible packaging bag according to the present invention will be described with reference to the drawings. FIG. 1 is a view showing an embodiment of a flexible packaging bag according to the present invention. In the figure, reference numeral 1 denotes a film-like check nozzle. The film-like check nozzle 1 is, for example, a fusion portion at a side portion of the packaging bag body 2, and an outermost sealant layer on the sealant layer on the inner surface thereof. Preferably, the base end portion is fused and joined by a sealant layer made of the same kind of resin material as the sealant layer of the bag body to constitute the flexible packaging bag A.

  Here, as shown in FIG. 2, the film-like check nozzle 1 is an enlarged cross-sectional view taken along the line III-III in the nozzle width direction of FIG. 3 and 4, for example, base film layers 5 and 5 ′ arranged in the longitudinal direction substantially in the width direction of the laminated plastic film, and respective sealant layers laminated on both surfaces of the base film layers 5 and 5 ′. 6, 6 ′, 7, 7 ′, the sealant layers 6, 6 ′ on the inner surfaces facing each other have a predetermined width, for example, 0. Manufacturing in a simple, rapid and always reliable manner by fusing to a desired shape (wedge shape) by heat sealing over a width of 5 to 3 mm, preferably 1.0 to 2.0 mm. To do It can be. Such a film check nozzle 1 is in its flat shape, and at its base end part, the outer surface side sealant layers 7 and 7 ′ are also fused to the inner surface of the packaging bag body 2, preferably by heat sealing. Thus, the packaging bag body 2 can always be joined appropriately, reliably and simply.

  The film check nozzle 1 includes a base film layer 5 made of a thermoplastic base film layer, for example, a biaxially stretched PET layer or NY layer having a thickness of 5 to 40 μm, preferably 10 to 30 μm, and the base film. Laminated plastic layered on each side of the front and back, comprising three layers of unstretched PE layer or PP layer having a thickness of 5 to 80 μm, preferably 10 to 60 μm, laminated on both sides of layer 5 A film, i.e. two laminated plastic films with the same contour shape, such as a wedge shape, or a laminated plastic film folded back on the front and back at the center, with the inner surface side sealant layer facing each other, By fusing each other except the edges, preferably by heat sealing, as shown in the figure with diagonal lines. It can be configured.

  In order to provide the check function, it is preferable that the film check nozzle 1 is formed by stacking as flat sheets as possible. At the nozzle base end, the outer surface side sealant layers 7 and 7 'are fused to the inner surface (sealant layer) of the packaging bag body 2 preferably by heat sealing, so that the packaging bag body 2 In addition, it can be joined appropriately, reliably and easily.

  As a specific structure of the film-like check nozzle 1 of the present invention, as shown in FIG. 2, the surface of the inner surface side sealant layers 6, 6 ′ of the film-like check nozzle 1, particularly the formation of the dispensing passage 8. The inner surface of the portion is preferably subjected to corona discharge treatment or the like to provide a surface with enhanced wettability and a wet treatment layer 11, thereby effectively exhibiting an outer check function. The wetting layer 11 is preferably provided on the inner surface of only the portion near the planned opening position, excluding the portion 1c serving as the nozzle base end and its vicinity, as indicated by the shaded portion in FIG.

  In particular, in the present invention, as shown in FIG. 3, the wetting layer 11 is disposed between the planned opening position 1a and the base end side 1c (L) on the inner surface of the extraction passage 8 (L) side. It is preferable to provide in the range of 2/3 (2 / 3L), thereby reducing the close contact between the plastic films of the film check nozzle 1 while effectively exhibiting the check function. Can always be discharged smoothly. In addition, about the formation range of this wetting process layer 11, it is preferable to consider the kind of packaged object, ie, the wettability of a packaged object.

  The film-like check nozzle 1 configured as described above is used at the same time as filling the liquid bag with a liquid package in the packaging bag body 2 made of a laminated film, or prior to filling the liquid package with a liquid seal. For example, the sealant layers 7 and 7 ′ on the outer surface of the base end of the nozzle 1 are preferably formed on the inner surface of the packaging bag body 2 at the fusion part between the sealant layers on the side of the packaging bag body 2. It becomes a part of the packaging bag by fusion-bonding by heat sealing.

  In FIG. 1, the film-like non-return nozzle 1 is provided with a tearing guide rod made of opening means such as an I notch, a V notch, a U notch, a base notch and a diamond cut at a planned opening position (spout port) 1a. It is preferable to provide it, and the tear-inducing fold is opened for use.

  Moreover, it is preferable that the film-like check nozzle 1 is provided with a spire-like protrusion 16 for preventing dripping at a position slightly closer to the base end side 1c side than the planned opening position 1a of the lower edge portion thereof. . The protrusion 16 is provided in order to prevent the dripping generated from the opening tip of the film check nozzle 1 from being transferred from the lower edge of the film check nozzle 1 to the packaging bag body portion 2. .

  On the outer surface of the film-like check nozzle 1, that is, the outer surface from the planned opening position 1a to the base end 1c side, as illustrated by dot display in FIG. It is preferable to provide a water repellent or oil repellent coating layer (water repellent or oil repellent coating layer) 10 at least along the opening edge and the lower edge.

  At the same time, by providing the water-repellent or oil-repellent coating layer 10 also on the spire-shaped protrusion 16 for preventing dripping, the liquid breakage can be further improved.

  In addition, as shown as an example in FIGS. 4 (a) to 4 (d), in the vicinity of the film-like check nozzle 1 of at least one laminated plastic film on the front or back of the packaging bag body 2, It is preferable to provide the concavo-convex structure 14 by embossing, blasting, etc., and this allows the adhesive force of the laminated plastic film based on the capillary action in the vicinity of the film-like check nozzle 1 of the packaging bag body 2 to be slightly relaxed. As a whole, a smooth flow can be ensured, and in particular, the pouring can be easily performed to the end when there are few remaining packages.

  On the other hand, the adoption of the concavo-convex structure 14 may lead to excessive pouring of the liquid package from the film check nozzle 1, and in order to prevent this, in the present invention, FIG. 1 and FIG. As shown in FIG. 4, a liquid reservoir portion 1b for dispensing amount control is provided at a position adjacent to the lower edge of the film-like check nozzle 1, particularly the nozzle mounting base end side (packaging bag body side), and the discharge flow is It is a preferred embodiment to temporarily stay in this zone to prevent unintentional excessive pouring and to provide stable dispensing.

  By adopting such a liquid reservoir 1b, the liquid article to be packaged guided from the packaging bag body 2 to the dispensing passage 8 of the film check nozzle 1 is temporarily retained in the liquid reservoir 1b, and the discharge flow rate Is generally lowered and then heads toward the expected opening position (spout port) 1a, so that the excessive outflow can be avoided.

  Further, in conjunction with the formation of the liquid reservoir portion 1b, more preferably, as shown in FIG. 3, the discharge flow is rectified at the seal portion at the base end portion of the discharge passage 8 of the film check nozzle 1. A projection (formed by a seal) 15 serving as a target damming portion may be provided so as to realize a fixed discharge. The protrusion 15 is preferably formed to be curved, thereby preventing excessive pouring due to the damming effect, and the discharge flow of the article to be packaged concentrates on the protrusion 15 and the seal peels off. There is no fear, and stable quantitative discharge becomes possible.

  In addition, as shown in FIG. 1, the base end portion of the film-like check nozzle 1 is subjected to fusion bonding of the check nozzle 1 to the inner surface of the packaging bag body 2 and has an original heat seal strength. Temporary sealing part 12 is formed by carrying out temporary fusion with the adhesive strength of half or less. According to this, the inflow of the liquid package packed and packaged in the flexible packaging bag A from the temporary sealing portion 12 to the tip side of the check nozzle 1 is surely prevented, and the package However, even if it is heated to 50 to 100 ° C., it does not permanently deform in the direction in which the dispensing passage 8 of the film check nozzle 1 swells, and the function of the film check nozzle 1 is always maintained. It can be fully demonstrated. In addition, when pouring out the package from the flexible packaging bag A, the temporary sealing portion 12 is opened by applying a load to the packaging bag A in the thickness direction of the packaging bag A, for example.

  The use of the flexible packaging bag A shown in FIG. 1 configured in this way is to open the film-like check nozzle 1 by opening the film-like check nozzle 1 from the tear guide rod 1a, that is, the spout 1a. In the secured state, the liquid packaged item in the flexible packaging bag A, for example, in the posture of tilting the flexible packaging bag A, intrusion and inhalation of outside air from the spout 1a provided in the film check nozzle 1 Do by pouring without. On the other hand, with the stop of the pouring based on the upright return of the flexible packaging bag A, the inner surface of the film-like check nozzle 1 is intervened by a liquid film made of a liquid package to wet the inner surface. In this way, it is possible to reliably prevent the outside air from entering the flexible packaging bag A.

  According to this, the liquid package to be degassed and packed in the flexible packaging bag A by submerged seal filling or the like is subjected to the flexible packaging under contraction or crushing deformation corresponding to the amount of liquid package to be dispensed. It will be poured out without the intake of outside air into the bag A.

  Furthermore, after stopping the pouring of the liquid package, the inside of the pouring passage of the film-like check nozzle 1 has a close sealing by a check function, and the intrusion of outside air into the flexible packaging bag A is prevented, The liquid package to be packaged remaining in the flexible packaging bag A can be sufficiently prevented from being polluted by outside air, oxidized, and the like.

  After the required amount of liquid to be packaged has been poured out in this way, the spout 1a provided at the tip of the film check nozzle 1 automatically closes and closes, and the flexible packaging bag is in that state. Return A to a standing posture.

  Here, the close contact of the film-like check nozzle 1 that provides this check function is, as described above, when the film-like check nozzle 1 is released from the water head pressure, and the soft laminated plastic film 3 on the front and back sides. 4 is returned to the original shape at the time of manufacture of the film-like check nozzle 1, and when the liquid package in the film-like check nozzle 1 is returned to the packaging bag main body portion 2, the soft laminated plastic films on the front and back sides By placing 3 and 4 in a reduced-pressure atmosphere, the inner surfaces (sealant layers 6 and 6 ') of the soft laminated plastic films 3 and 4 are placed under the interposition of the liquid package to adhere to those surfaces. For example, the entire width of the check nozzle 1 is adsorbed by negative pressure by the capillary action of the liquid package.

  The close-close closing of the front and back laminated plastic films 3 and 4 based on such an outer self-seal check function is achieved by the fact that the packaging bag body portion 2 that has been crushed and deformed is based on the inherent elastic restoring force. In the case where the inside of the portion 2 tends to be decompressed, it is more reliably maintained.

  In addition, filling the flexible packaging bag A with a liquid package so that gas does not enter the bag by filling with a liquid seal causes the self-sealing check action of the film check nozzle 1. Although it is necessary above, sometimes a very small amount of outside air may enter during pouring, and the gas contained in the package itself may later be generated in the bag. In order to store such gas in position and to ensure non-return dispensing from the film-like check nozzle 1, the upper part of the packaging bag body 2, that is, the upper part above the film-like check nozzle 1. It is preferable that one or more gas reservoir spaces 13 as shown in FIG. 3 are provided in the lateral seal portion in the bag width direction as necessary.

  Another embodiment of the flexible packaging bag A of the present invention shown in FIG. 6 is a self-supporting standing pouch S having a ship bottom bottom 9 at the lower end (bottom) of the packaging bag body 2. It is preferable that it is a self-supporting bag that is formed by fusion-bonding the removed three sides by heat sealing or the like, so that a vertical seal is applied to the left and right side edges even after gas-less filling of the liquid package into the bag body 2. Thus, the standing shape can be flat and flat at the top, and the cylindrical shape at the bottom. Therefore, the two soft laminated plastic films 3 and 4 constituting the film-like check nozzle 1 have high flatness (flatness) and can effectively exhibit a self-seal check function.

  Further, it is preferable that both corners of the bottom portion 9 are chamfered as shown in FIG. 6 so that the bottom portion 9 has a gently curved downward convex shape. The entire lower end of the self-supporting standing pouch S is attached to the floor without touching the surface, and a self-supporting and stable standing posture can be ensured.

  In addition, it is preferable to chamfer both corners of the ship bottom-shaped bottom portion 9 of the self-standing standing pouch S so that the curvature radius R is 8 mm or more, and more preferably in the range of 8 mm to 20 mm. In particular, the radius of curvature R is preferably formed so as to gradually decrease toward the bottom of the standing pouch S. The reason why the radius of curvature R is 8 mm or more is that when the radius is less than 8 mm, both corners of the bottom of the ship bottom hit the floor and the central portion of the standing pouch S is lifted.

  The flexible packaging bag A shown in FIG. 6 has a wetting layer 11 (shaded part) on the inner surface of the part near the planned opening position 1a except for the part that becomes the nozzle base end 1c of the film-like check nozzle 1 and its vicinity. ) And a coating layer (water-repellent and oil-repellent coating layer) 10 of a water-repellent agent or an oil-repellent agent on the outer surface in the vicinity including the planned opening position (spout port) 1a. Thereby, while maintaining the non-return function of the film-like non-return nozzle 1, the packaged article can be smoothly poured out, and the occurrence of dripping from the spout 1a can be effectively suppressed. Even if dripping occurs, it is possible to prevent dripping from reaching the packaging bag body 2 by the water / oil repellent layer 10 provided on the outer surface near the spout 1a.

  The technology of the present invention can be used as a general liquid-filled package, particularly as a refillable packaging bag having a liquid spout.

A Flexible packaging bag S Standing pouch 1 Film check nozzle 1a Expected opening position (spout)
1b Liquid reservoir 1c Base end 2 Packaging bag body 3, 4 Laminated plastic film 5, 5 'Base film layer 6, 6' Inner sealant layer 7, 7 'Outer sealant layer 8 Outlet passage 9 Bottom 10 Water / oil repellent Coating layer 11 Wetting layer 12 Temporary fusion portion 13 Gas reservoir space 14 Concave / convex structure 15 Damping portion 16 Dripping prevention protrusion

Claims (10)

Projecting on the side of the bag body, the outer peripheral edge part is fused together except for the base end part connected to the bag body and the central part that forms the liquid discharge passage For a soft packaging bag for filling a liquid material, which has an outside check function that prevents the outside air from entering the bag by interposing a liquid material in a minute gap between overlapping soft laminated plastic films. In a flat film check nozzle,
The inner surface of the laminated plastic film of either one or both of the dispensing passages is subjected to a wetting process only on the portion near the planned opening position except for the portion serving as the nozzle base end and the vicinity thereof. A film-like check nozzle.   The range of the wetting treatment layer is applied to a range of 2/3 on the planned opening position side between the planned opening position and the portion serving as the nozzle base end side in the dispensing passage of the film-like check nozzle. The film-like check nozzle according to claim 1.   The wetting treatment layer is composed of one or more treatment layers of corona discharge treatment, UV ozone treatment, resin coating treatment, metal deposition treatment, electroless plating treatment, metal low temperature spraying treatment, plasma etching treatment, and flame treatment. The film-like non-return nozzle according to claim 1 or 2, characterized in that:   The outer surface of the film-like check nozzle has a coating layer of a water-repellent substance or an oil-repellent substance in the vicinity including at least a planned opening position provided at the tip thereof. The film-like check nozzle according to any one of the above.   The base end part of the flat film-like check nozzle according to any one of claims 1 to 4, with respect to the packaging bag body of the packaging bag for filling a liquid material, the side part, corner part or top part of the bag body A flexible packaging bag formed by fusion-bonding and projecting to any of the inner surfaces.   The base end portion of the film-like check nozzle has a sealant layer facing to be bonded at a low temperature by a low melting point plastic film, and an inner surface of the dispensing passage is temporarily sealed. Flexible packaging bag.   In the packaging bag body, the non-sealed part of either the front or back laminated film is at least the upper part or the part in the vicinity of the side edge on the film-like check nozzle side is constituted by a laminated film having an uneven structure. The flexible packaging bag according to claim 5 or 6.   The concavo-convex structure formed on the laminated film is embossed, blasted, knurled, wrinkled, vertically and horizontally striped on one or both of the front and back laminated films in a planar shape, a striped shape, and a striped shape, The flexible packaging bag according to claim 7, wherein the flexible packaging bag is formed as a partial pattern or an entire pattern.   The flexible packaging bag according to any one of claims 5 to 8, wherein a bottom portion for self-supporting is provided at a lower end of the packaging bag body.   The flexible packaging bag according to claim 9, wherein the packaging bag body is a three-side sealed self-supporting bag excluding the bottom portion for self-supporting, and the standing shape is flat at the top and cylindrical at the bottom.

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