JP5360573B2 - Flexible packaging bag having a film-like non-return nozzle for pouring liquid material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible packaging bag capable of exhibiting a desired self-seal non-return checking function, even when a film-like non-return checking nozzle part and a bag body part are integrally formed for both front-back sides with one piece of single layer plastic film respectively. <P>SOLUTION: Disclosed is a flat film-like non-return checking nozzle part such that its outer peripheral part, excluding pour-out passage portion, of a pair of front-back overlapped approximately triangular trapezoidal shaped single films are mutually fusion-bonded, while in addition, the interposal of liquid-state substance in micro-gaps formed at pour-out passage portion between the mutual single layer films is designed to cause an inwardly-directed non-return checking function to be generated that prevents ingression of outside air into within the bag. This flat film-like non-return checking nozzle part is allowed to protrude from one location of a lateral portion, corner portion or top part of the flexible packaging bag body made of single layer films while both the front and back parts are integrally provided with one piece of single layer film respectively, with the inside surface of at least either film of the film-like non-return checking nozzle part being a wetting reinforcement surface after having been put through a wetting process. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a packaging bag formed by superimposing two flat plastic single-layer films (hereinafter referred to as “single-layer film”) on the front and back, and to prevent the outside air from entering the bag. The present invention relates to a liquid filling soft packaging bag, ie, a flexible packaging bag, which is formed by integrally projecting a liquid material pouring film-like non-return nozzle portion having a self-sealing check function for automatically blocking.

  As a packaging bag provided with a film-like check nozzle for pouring a liquid material made of a plastic laminated film having a self-seal check function, there are those disclosed in Patent Documents 1 and 2. These conventional packaging bags mainly form a film-like check nozzle and a bag body separately, and the outermost sealant layer of the film-like check nozzle at the side or top position of the bag body, For example, it is formed by fusion bonding with the method and apparatus disclosed in Patent Document 3.

JP 2005-15029 A JP-A-2005-59958 JP 2008-55793 A JP 2009-132410 A

  The non-return function of the film-like non-return nozzle disclosed in Patent Documents 1 and 2 refers to the laminated films of two plastic soft laminated films that are overlapped and face each other on the front and back surfaces that can be flat and in close contact with each other. The intrusion of outside air that comes in as it is originally replaced by the extraction of the contents, because the extraction passage consisting of minute gaps formed between each other strongly adheres by the liquid substance always intervening by capillary action The self-sealing check function that prevents the flow inward from the outside is exhibited.

  In the conventional packaging bag, the film-like check nozzle and the bag body are mainly formed as separate bodies, and therefore a process of fusing and joining the film-like check nozzle and the bag body is necessary. It is absolutely necessary to use a laminated film. That is, for fusion bonding between the two, a sealant layer is preferably required on both the front and back sides at least for heat sealing, and it is desirable to use a three-layer laminated film. In addition, the fusion bonding part between the bag body and the film-like check nozzle is heated at the end of the film-like check nozzle, particularly in order to prevent leakage of the packaged article due to peeling or sealing failure. It was necessary to repeat the sealing and the like to increase the bonding strength. Otherwise, there is a risk of bag breaking.

  Further, the film check nozzle has, for example, a three-layer structure of a base film layer and respective sealant layers laminated with the base film layer interposed therebetween. The base film layer and the sealant layer include an adhesive layer, an anchor coat layer, and the like. It is laminated through. Thus, when the film-like check nozzle and the bag main body are configured separately, the base end side of the film-like check nozzle (the fusion bonded portion with the bag main body) has the above-mentioned inside the bag main body. The adhesive layer, the anchor coat layer, and the like are exposed, and there is a possibility that they may come into contact with the packaged items in the bag. Therefore, from the viewpoint of safety and hygiene, the base film layer is heated and pressurized by sandwiching the base end side of the non-return nozzle from above and below using heat sealing means by a method as disclosed in Patent Document 4. Each sealant layer sandwiched and laminated requires a process for covering the end face of the base end side, which has a problem that the manufacturing process is complicated and expensive.

  In order to solve the above-described problems of the prior art, the inventor has examined a packaging bag formed by integrally forming a film-like check nozzle and a bag body using a single plastic film. However, for the bag body portion, it is necessary to use a film having a certain thickness and stiffness to support the weight of the object to be packaged, whereas in the film check nozzle portion, the self-seal In order to effectively exert the check function, it is necessary to use a thin, flexible film with good wettability that easily causes capillary action. The characteristics are different. In this sense, it has been difficult to integrally form the film-like check nozzle and the bag body using the same plastic film, and to effectively exhibit the same self-seal check function as in the past.

  Therefore, the main object of the present invention is to achieve a desired self-sealing check even when the film-like check nozzle part and the bag body part are integrally formed of a single layer of plastic film on both the front and back sides. The purpose is to propose a flexible packaging bag that can exhibit its function.

  In particular, the present invention can be easily manufactured, achieves cost reduction, and is formed by integrally forming the film-like check nozzle and the bag body. The purpose of this invention is to propose a flexible packaging bag that can improve the flatness (flatness) and effectively exhibit the check function.

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 pair of substantially triangular trapezoidal single-layer films that are overlapped on the front and back, and the outer peripheral portions excluding the dispensing passage portion are fused together, and the dispensing passage between the single-layer films. The flat film-like non-return nozzle part which made the inward non-return function which prevents the penetration | invasion into the bag of outside air by interposing a liquid substance in the micro clearance gap formed in a part consists of a single layer film The soft bag body portion is integrally provided with one single-layer film on both the front and back sides in a state of protruding from one of the sides, corners, or top of the soft bag body portion, and at least the film shape one of the film inner surface of the non-return nozzle portion, Ri wet strengthened surface der were wet processed, and single-layer film of the front and back, respectively overlaying the at least one of thickness and Koshido is a different such Rukoto Feature It is a flexible packaging bag to.

In the present invention, the flexible packaging bag is
(1) The wet reinforcement surface is a corona discharge treatment surface, a UV ozone treatment surface, a flame treatment surface, a resin coating treatment surface, a metal deposition treatment surface, an electroless metal plating treatment surface, a metal low temperature spray treatment treatment surface, and a plasma etching treatment surface. Consisting of one or more of the processing surfaces ,
(2 ) The boundary between the bag body portion and the base end portion of the film-like check nozzle portion is temporarily sealed by low-temperature fusion between facing films;
( 3 ) The bag main body portion is formed by a single layer film having a concavo-convex structure at least on the upper side or in the vicinity of the side edge on the film check nozzle portion side of the front or back single layer film. That it is configured,
( 4 ) The concavo-convex structure formed on the single layer film is embossed, blasted, knurled, wrinkled, vertical / horizontal striped, planar, striped, striped on one or both of the front and back single layer films. Applied to the shape and formed as a partial pattern or a full pattern,
( 5 ) A self-supporting bottom portion is provided at the lower end of the bag body portion;
( 6 ) The bag body part is a three-sided seal self-supporting bag excluding the bottom for self-supporting, and the standing position when filling the package is flat at the top and cylindrical at the bottom,
However, this is a more preferable solution.

  According to the present invention, the film-like check nozzle portion and the bag body portion are integrally formed by setting the inner surface of at least one of the film-like check nozzle portion as a wet-strengthened surface that has been wet-treated. A flexible packaging bag is formed by superposing two single-layer plastic films, and the inner surface of the dispensing passage is formed between two overlapping single-layer films constituting the film-like check nozzle portion. Capable of always interposing a liquid package by capillary action, which brings about a high adhesion force derived from the intermolecular force generated between the films at this time, and the self-sealing check function of the film check nozzle Can be exhibited more reliably.

  In the flexible packaging bag of the present invention, the part that becomes the film-like non-return nozzle is formed by integrally forming a single film by projecting from the upper part of the side part of the bag body part preferably. This eliminates the need for fusion-bonding the conventional film-like check nozzle and bag body and the end face treatment at the base end of the film-like check nozzle, simplifying the manufacturing process and reducing costs. Can be realized.

  In the present invention, a packaging bag formed by projecting a substantially triangular trapezoidal film-shaped check nozzle portion showing a self-seal check function from the main body is different in at least one of thickness and stiffness. Since it is formed by superposing single plastic single-layer films, the single-layer film on the side with the larger thickness or stiffness (hereinafter referred to as “thickened film or high-elasticity film”) has the core function. It is possible to improve the stability (directivity) of the liquid material in the pouring (discharging) direction without bending or distorting the film check nozzle portion. In addition, a single-layer film having a small thickness and low elasticity (hereinafter referred to as a “thin film or low-elasticity film”) is in close contact with the thickened / high-elasticity film, so that flatness (flatness) between the single-layer films can be obtained. Degree) as well as check functionality can be further improved.

  According to the present invention, the inner surface of the base end portion that communicates with the bag main body portion of the film-like check nozzle portion is preliminarily sealed by a low-temperature fusion treatment, so that this nozzle portion is used when hot-packing or handling. Even if an unexpected force is applied to the film, a film-like check nozzle is provided that does not impede the function of the inward check in which the outside air replaces the discharge of the contents and flows back into the bag. Thus, a flexible packaging bag can be provided.

  According to the present invention, at least part of the single-layer film of the bag body portion is preferably provided with a striped uneven structure, so that the remaining capacity is reduced particularly during re-pouring, etc. Prevents re-pouring failure due to the acting check function, enabling smooth pouring at any time, and even when the bag body part is crushed and deformed due to the check function, pouring is easy to the end. To be able to.

  Further, according to the present invention, the flexible packaging bag itself can be made self-supporting by providing a self-supporting bottom portion at the lower end of the bag main body portion, and the bag main body portion is a three-side sealed bag excluding the self-supporting bottom portion. Therefore, even after the liquid package is filled in the bag body with a liquid seal, the standing shape maintains a flat shape at the upper part of the lower cylindrical shape (to ensure filling space). Therefore, the check function of the film-like check nozzle portion 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 which illustrates the single layer plastic film which comprises the flexible packaging bag which concerns on this invention. It is another expanded sectional view which illustrates the single layer plastic film which comprises the flexible packaging bag which concerns on this invention. It is a front view of the state which provided the coating layer in the film-like non-return nozzle part of the flexible packaging bag which concerns on this invention. It is a basic diagram which illustrates the uneven | corrugated processing area | region provided in the bag main-body part 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 flexible packaging bag of the present invention is a soft packaging bag in which single-sided films on the front and back sides are made by means such as heat sealing or impulse sealing, and is provided on any one side, corner or top of the bag main body. The bag body part and the front and back are each integrally formed by molding a single layer film, and self-seal reverse is achieved by exerting a cap action that automatically prevents the outside air from entering the bag. A film-like check nozzle portion that performs a stop function is integrally formed in a protruding state.

Such a flexible packaging bag of the present invention has two layers of overlapping (facing the front and back) and a pair of single-layer films, leaving the top of the bag body part, and the outer peripheral edge of each other, for example, heat. By fusing with a seal, an impulse seal, a high frequency seal or the like, a flat film-like check nozzle portion and a bag main body portion are collectively formed using a general bag making machine. Thereafter, from the unsealed portion of the top of the bag body, the liquid package is filled with the liquid seal, or after the liquid package is filled or simultaneously, the bag is degassed, etc. Gas-less filling is performed while sufficiently excluding gas (air). In this way, the flexible packaging bag of this invention provided with the film-like non-return nozzle part which has a non-return function by which the liquid to-be packaged material is filled liquid-tightly is obtained.
Here, “fill-in-liquid seal filling” means that the liquid filled in the bag is placed between the films when the films are heat-sealed so that no gas such as air or nitrogen remains in the packaging bag. Under the sandwiched state, a part of the liquid is expelled and heat sealed together (contaminant seal as disclosed in JP-A-1-153410).

  In addition, the non-return function which the film-like nonreturn nozzle part which protrudes from the bag main-body part of the flexible packaging bag of this invention shows the liquid in a bag main body when pouring a to-be-packaged item from a packaging bag. A non-return function for preventing an inward flow of air or the like that prevents the entry of air or the like into the bag body filled with the liquid package object, for example, Japanese Patent Application Laid-Open No. 2005-52596. Like the check nozzle of No. 1, the check function is different from the check function that prevents the outward flow that prevents the packaged article from being discharged from the bag body side.

  That is, the film-like non-return nozzle portion is covered by two capacities of two plastic films that can be flatly adhered to each other on the front and back, and in a minute gap between the overlapping films by capillary action. It is intended to exert an adhesive force derived from intermolecular force caused by the constant presence of a liquid material, and to exhibit the self-seal non-return function. For at least the film-like non-return nozzle portion, a high non-return effect can be obtained with higher flatness (flatness). The gap at the time of superposition | polymerization of the preferable single-sided film of 2 sheets of front and back is about 2 micrometers-300 micrometers, Preferably it is about 2 micrometers-30 micrometers.

  Therefore, in the present invention, the film-like check nozzle portion and the bag main body portion are integrally formed using a single monolayer film in order to effectively exhibit the inward check function as described above. It is effective to wet the inner surface of at least one of the front and back single-layer films. In particular, this wet treated surface is provided on the inner surface of the dispensing passage of the film-like check nozzle portion. That is, the adhesion force derived from the intermolecular force generated by the liquid package always intervening on the inner surface of the dispensing passage by capillary action between the two front and back single layer films constituting the film check nozzle part. As a result, the inward check function described above (preventing entry of outside air into the bag) can be more reliably exhibited.

  The wetting treatment is, for example, corona discharge treatment, UV ozone treatment, flame treatment, resin coating treatment such as acrylic resin or cellulose, metal vapor deposition treatment on the surface of a single layer film made of PE, PP, EAV, ionomer, etc. By applying a wetting process such as electroless metal plating, metal low-temperature spraying, plasma etching, etc., physical surface modification of the film surface and chemical surface modification by the generation of polar functional groups This is a process for improving the wettability of the film by a synergistic effect, and the film surface subjected to this process is referred to as a wet process surface ("wet strengthening surface").

Therefore, the inventors verified the operational effect of this wetting treatment. Table 1 shows the results. That is, the corona discharge treatment (discharge condition: discharge amount: 81.7 W ·) is applied to the inner surface of the pouring passage (inner surface of the sealant film) of the film-like check nozzle portion of the flexible packaging bag of the present invention using a single layer film of PET50. min / m ² ), the wetting tension of the inner film was measured using a wetting reagent.

  As a result, the wetting tension before the wetting treatment was 32 N / m, but after the treatment it was 56 N / m. In addition, the contact angles for water, soy sauce, ponzu, and oil are as shown in Table 1. The cohesive force of the liquid, that is, the surface tension (S) is weakened, and the contact angle (θ) is clearly reduced in all cases. The wettability is improved, and the necessary liquid can always be present between the films in combination with the above-mentioned capillary phenomenon, even when the flexible packaging bag is not used for a long time. The effectiveness of this treatment was confirmed in order to reliably provide a check function without causing the discharge passage to dry.

Moreover, in this invention, in order to demonstrate the stability (directivity) of the discharge direction of a film-like non-return nozzle part and the said outer side non-return function effectively, as a single-layer film on each side of the front and back which comprises a packaging bag , at least one of the thickness and stiffness of different, with the thickened film Kokoshido film and the thin film Teikoshido film, these overlapping, that form a packaging bag.

  In this case, the thickness of one single layer film (thickened film) is thicker than the thickness of the other single layer film (thin film). For example, the thickness of the thickened film is 60 μm or more and 250 μm or less, preferably 80 On the other hand, the thickness of the thin film is 10 μm or more and less than 60 μm, preferably 20 to 40 μm.

  Further, the two single-layer films of the front and back surfaces are such that one single-layer film (high waist film) has a higher waist than the other single-layer film (low waist film). It is preferable to use a low waist film having a waist of 40 mN or more and 600 mN or less, and a low waist film having a waist of 10 mN or more and less than 40 mN. The waist is the bending strength per unit width (15 mm) of the single layer film, and the waist measuring device (Mini Bear Co., Ltd.) disclosed in FIG. 10 of Japanese Patent Application Laid-Open No. 2005-59958. ) Value measured using load cell UL-100GR).

  The thickness and waist of the single-layer film are less than the above ranges for thick films and high waist films (thickness: less than 60 μm, waist: less than 40 mN), or the above ranges for thin films and low waist films. In the case of exceeding (thickness: 60 μm or more, stiffness: 40 mN or more), the adhesive force based on the intermolecular force of the liquid package to be always interposed between the single-layer films after the package is poured out as described above. Therefore, when the thick film / high waist film and the thin film / low waist film are in close contact with each other, the thick film / high waist film cannot function as a core material, and the pouring directivity deteriorates. On the other hand, when the thickness or stiffness of the single layer film exceeds the above range for the thick film / high waist film (thickness: more than 250 μm, waist: more than 600 mN), the bending strength becomes too large, The adhesiveness of the inner surface of the film-like non-return nozzle portion after stopping the dispensing of the package may be impaired, and the non-return function may not be exhibited effectively. In addition, regarding a thin film / low waist film, if the thickness or waist of the single layer film is below the above range (thickness: less than 10 μm, waist: less than 10 mN), sufficient strength may not be ensured.

  In addition, as a single layer film constituting the flexible packaging bag of the present invention, polyethylene terephthalate, nylon, polyester, polypropylene, EVOH, polyethylene, ethylene vinyl acetate copolymer layer, ethylene ethyl acrylate copolymer layer, ionomer layer, etc. It is preferable to use a film.

  By the way, the film-like non-return nozzle portion formed integrally from the bag body portion of the flexible packaging bag according to the present invention has a nozzle opening in the vertical packaging bag, that is, the length of the spout edge portion, It is preferable to be about 5 to 100 mm. The “vertical direction” is the angle in the range of 0 to 15 ° with respect to the tearing direction, and thus the extending direction of the nozzle opening edge, with respect to the width direction of the single-layer film, as described above. It is considered that there is a case where it is inclined by. If the length of the film valve 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 substance / oil-repellent substance is formed on at least the outer surface of the opening (pouring) of the film-like check nozzle part, that is, the outer surface in the vicinity including the planned opening part. It is preferable to provide it. When such a treatment is applied to the film-like check nozzle portion, 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 material, a water repellent coating agent made of silicone oil, fluorine resin, acrylic resin or amide resin is used, and as the oil repellent material, silicon resin or Teflon (registered trademark of DuPont, USA) resin, 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.

  The reason why it is preferable to provide 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, and the liquid package is applied to food. In order to prevent the excess, after forming the spout, many of the square-shaped packaging bags are tilted little by little and poured into the liquid bag, so that the liquid packaging material is formed in the tilted posture of the packaging bag. It is often dropped at an unintended location along the side part that is lower than the exit, i.e., on the lower side of the exit, and sometimes the clothes are soiled by the liquid packaging, This is to prevent this.

  As a result, even if the liquid package is highly viscous, such as oily dressing or salad oil, it is positioned below the spout opening from the tip of the film check nozzle portion 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.

  The contact angle between such a water / oil repellent coating layer and a liquid package, such as soy sauce or oil, is preferably in the range of 100 to 170 °. The wraparound of the object can be sufficiently prevented, and the accuracy of dispensing can be further enhanced.

  Therefore, the inventors examined the influence of the presence or absence of the water-repellent layer on the liquid breakage of the liquid package. That is, with respect to the film-like non-return nozzle portion projecting from the bag main body portion of the flexible packaging bag made of biaxially stretched nylon having a thickness of 65 μm, from the opening planned portion (scheduled outlet planned line portion) to the bag main body side. Two types were prepared: one provided with a water-repellent layer coated with silicone oil as a coating agent on the lower edge (invention compatible example) and one not provided with a water-repellent layer (comparative example). 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 biased toward the base end side from the planned opening portion (spout port) at the lower edge of the film check nozzle portion. This dripping prevention protrusion causes the dripping generated from the spout of the film-like check nozzle part to flow down the protruding part before reaching the side part that will be located on the lower side of the packaging bag. Thus, the bag main body part and the inside of the outer container surrounding the bag body are not contaminated, and the possibility of dripping the liquid to an unintended location can be effectively removed. 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.

  In addition, it is typical that the film-like non-return nozzle portion has a protrusion length X from the bag main body portion of about 30 to 100 mm and a valve width (a tear opening position) Y of about 20 to 80 mm. .

As the flexible packaging bag of the present invention, it corresponds to the case of repeated pouring, and even in the case of re-pouring, as in the first case, smooth and controlled pouring of a predetermined amount can be performed. It is desirable to do so.
Therefore, in the present invention, at least one inner surface of the bag main body portion has a concavo-convex structure, that is, each seal (horizontal seal, vertical seal) portion on at least one inner surface of the front and back single-layer films. It is preferable to use a portion having a concavo-convex structure provided with any one of a roughening process such as embossing, blasting and knurling, random wrinkle processing, and vertical and horizontal stripe processing. 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 in the bag main body part is that after the liquid package is poured out by the action of the film-like check nozzle part, only the check action of the film-like check nozzle part. In addition, the bag main body portion is also prevented from invading (backflow) of the outside air, and is in a tightly adhered state (reverse action) between these single-layer films under the presence of a liquid substance. In particular, the inside of the bag body is in a strongly fused state due to shrinkage of the single layer film or crushing deformation of the bag body portion by the volume corresponding to a considerable amount of the poured liquid.

  As a result, when the liquid package to be filled is to be poured out again through the film-like check nozzle portion, when there is a sufficient amount of liquid (liquid height) in the bag body portion (water head pressure) Smooth pouring is compensated to some extent, but when the amount of liquid in the bag decreases, the water head pressure decreases, and the pour pressure loses the adhesive force due to the capillary action between the single-layer films. Therefore, smooth pouring and liquid return are hindered.

  In particular, when the amount of liquid in the bag is reduced, wrinkles are generated in the bag main body part, which causes a blocking action, the liquid flow stagnates, and the liquid flow path is cut off, making smooth pouring difficult. In this case, too, 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 adhesion of the single-layer film based on the capillary action in the vertical and horizontal ranges at least in the vicinity of the film-like check nozzle portion of the bag body portion, In order to prevent flow stagnation, stagnation and clogging and to secure a flow path, that is, the adhesion force due to the presence of water remaining due to the capillary action generated in the bag body part is reversed by the reverse of the film check nozzle part. In order to alleviate without lowering the stopping effect, it is preferable to provide a concavo-convex structure consisting of a linear or curved stripe pattern on at least one of the single-layer films on the front and back of the bag main body part, particularly the bag main body. The capillary action is weakened in the part.

  The concavo-convex structure to be added to the single-layer film is such that the gap between the single-layer films on the front and back of the bag body portion (excluding the vertical seal, horizontal seal, and the joint seal portion between the valve and the main body), that is, the thickness of the liquid layer In general, the adhesive force based on the capillary action described above is generated at about 2 to 5 μm, but one or both of the single-layer films are embossed, for example, and the gap between the films is 20 μm or more, preferably Concavities and convexities are provided so as to be 30 μm or more, more preferably 50 μm or more. In this case, the capillary action is reduced, resulting in a decrease in the adhesion between the single-layer 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 wrinkle processing, blast processing, knurling processing, vertical and horizontal striped processing may be performed. For example, in a bag making machine, It is molded using a hot roll (70 to 80 ° C.) before or after bag making.

  When the inventors filled a flexible packaging bag made of a single-layer film of PET60 with soy sauce as a packaged object in a liquid seal, tilted it, discharged the packaged article, and the packaged article stopped coming out An experiment was conducted to measure the remaining amount. As a result, as shown in Table 3, it was found that the effect was remarkable when a monolayer film subjected to uneven processing was used. In this experiment, in the vicinity of the film-like check nozzle portion of the bag body portion, a comparison was made between those provided with a striped uneven pattern and those provided with an embossed uneven pattern and those not subjected to 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 addition, the concavo-convex structure described above is provided in such a manner that at least a part of the bag main body part and the film-like check nozzle part, that is, the non-sealed part, for example, the formation position thereof is at least the film main body part Striped concavo-convex structure provided in the film-like check nozzle part or a striped concavo-convex structure provided in the bag body part so as to continue from the side edge on the nozzle part side to the extraction passage of the film-like check nozzle part And may be provided in a substantially continuous (consecutive) continuous manner. Thus, it is effective for securing the flow path at the time of re-pouring by providing the uneven structure not only to the bag body part but also to the film-like check nozzle part. The concavo-convex structure is formed by applying a striped concavo-convex pattern in the form of a partial pattern of the surface or island shape or the entire pattern.

  By the way, the concavo-convex structure for ensuring the smooth pouring of the liquid package filled in the flexible packaging bag with the liquid seal extends from the bag body portion to the tear opening position of the film check nozzle portion ( It is effective to consist of a series of vertical stripes that are continuous in a straight line or curved line (preferably up to a position 5 mm or more away from the tear line). In particular, the concavo-convex structure is intended to form a smooth route that does not stagnate the liquid material from the bottom of the bag to the film-like check nozzle even when there is little liquid package in the flexible packaging bag. It is effective to eliminate the damming on the way due to the folding back of the film, etc., from the bag main body portion to the slit opening portion of the film-like check nozzle portion.

  By the way, the liquid packaging material filled in the flexible packaging bag according to the present invention is poured into the opening portion to be formed near the tip of the film check nozzle portion (addition of a tear guide rod or notch). This is done by cutting off the tip from the position with your fingers and opening it. That is, after opening the check nozzle portion, the liquid package is tilted so that the main body portion of the packaging bag is in a posture in which the opening (spout) of the film check nozzle portion faces downward. The required pouring is performed.

  In this case, the film-like non-return nozzle part is a film-liquid produced by constantly interposing a liquid substance by pressurizing the main body part of the flexible packaging bag by the action of the water head pressure of the liquid article to be packaged or by fingers. -The intermolecular force between the films resists, creating a large gap by separating the front and back sides, opening the pouring passage, and allowing pouring of the liquid package.

  In addition, when the liquid package is poured out through the opening (spout) of the film check nozzle portion, the bag main body portion made of a soft single-layer film is in spite of the liquid package being poured out. Since the check nozzle part 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 (back flow). The bag main body portion is successively contracted or crushed and deformed by an amount corresponding to the volume of the poured body.

  In this way, after filling the flexible packaging bag with the liquid material, by tilting it under the opening of the film check nozzle portion, a required amount of liquid packaged material is poured out from the bag, The outflow of the liquid package from the opening of the film check nozzle portion is stopped by returning the flexible packaging bag to the original standing posture. Due to the stoppage of the outflow, the non-liquid portions in the discharge passage of the film check nozzle portion and the bag main body portion are always covered by the liquid matter filled in the bag main body due to capillary action. Since the package becomes wet due to the interposition, the inner surface of the plastic film of the film check nozzle is closely attached to each other at the same time as it is stopped, so it is provided at the tip of the film check nozzle In addition, since the opening remains in close contact, it is possible to reliably prevent outside air from entering the bag body.

  In such a flexible packaging bag having a film-like check nozzle part, the liquid packaged material filled in the bag is completely shielded from outside air not only before but also during and after the dispensing. Therefore, oxidation and fouling of the liquid packaged item in the bag are effectively prevented.

  As is clear from the above description, as long as liquid material remains in the bag body on the inner surfaces (pour-out passages) of the two plastic single-layer films constituting the film check nozzle portion The liquid matter is always present due to capillary action. That is, the inward check function (the function of preventing the outside air from entering the bag) by the close contact between the two single-layer films is achieved by the return of the flexible packaging bag by the film-like check nozzle portion. Is released from the action of the water head pressure and returns to the original shape at the time of manufacture. In addition, when a part of the liquid package in the film check nozzle part returns to the bag body, the liquid package is reduced by a reduced pressure. The inner surfaces (pouring passages) of the pair of front and back films wetted by an object are automatically performed by adsorbing 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 part has an excellent self-seal reversal effect due to the upright return of the flexible packaging bag and automatic close-sealing (self-sealing) of the spout opening which is the opening of the flexible packaging bag without any special operation. The stop function will be demonstrated.

  On the other hand, the re-pouring of the liquid package is more preferably performed by tilting the flexible packaging bag of the present invention as described above, and preferably by further pressurizing the trunk of the bag body. This is effective, and can be stopped by raising the packaging bag as described above. In this case as well, the film-like check nozzle portion exhibits an excellent check function against the intrusion of outside air based on the automatic close sealing.

  In such a flexible packaging bag of the present invention, at the base end position (protruding base end position) of the film-like non-return nozzle portion, the two single-layer films superposed on the front and back sides are half the original sealing strength. What was made into the relatively temporarily fused state (temporary sealing part) with the following adhesive strengths is preferable.

  In addition, the temporary sealing part by temporary melt | fusion is implement | achieved by reducing at least one of the heating temperature of a sealing means, pressurization pressure, and pressurization time compared with the case where a complete melt | fusion joining part is formed. be able to.

  By the way, in the formation of the temporary sealing part, the formation position of the film-like check nozzle part can be the base position protruding from the bag body part, of course, than the position. The position may be slightly deviated toward the inside of the bag body, or conversely, the position may be slightly deviated from the position to the outside of the bag body. And in any of these cases, the package-extracting nozzle portion having a length (about 5 to 80 mm) sufficient for the film-like non-return nozzle portion to exhibit its original function, It is necessary to remain on the outside of the temporarily fused portion, that is, the temporarily sealed portion (the tip side of the check nozzle portion).

  As described above, the temporary sealing portion of the liquid package to be packed and packaged in the packaging bag is provided by providing the temporary sealing portion at or near the protruding base end position of the film check nozzle portion. Inflow from the stopper to the tip side of the check nozzle part is surely prevented, and even if the article to be packaged is heated to 50 to 100 ° C., A large part of the package extraction passage is sufficiently protected from permanent deformation in the direction of inflating the extraction passage.

  Therefore, the part of the film-like non-return nozzle part on the tip side from the temporary sealing part can always fully exhibit the function of the film-like non-return nozzle part. In this case, it is possible to sufficiently prevent the outside air from entering the bag main body portion, and it is possible to reliably exhibit the self-seal non-return function when stopping the pouring of the package.

  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-like non-return nozzle is broken or cut off to form a dispensing opening. In this state, the packaging bag is tilted so that the dispensing opening faces downward. It is assumed to be out 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 non-return nozzle portion that has not been subjected to the full deformation due to the heated packaged object causes the intrusion of outside air into the bag due to the extraction of the packaged object in the bag, and the bag body part collapses. Can be effectively prevented with the opening of the dispensing opening under necessary and sufficient opening. In addition, when stopping the pouring of the packaging bag based on the return to the standing posture, outside air intrudes into the bag by the self-seal check function by returning the pouring valve part wetted to the packaged product to the original shape. Can be reliably prevented.

In addition, the heat seal strength of the temporary sealing portion should be 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 when the heat seal strength is too high, other fusion-bonded portions may be affected by the load required to open the temporary sealing portion.

  Moreover, in the flexible packaging bag of this invention, the bottom part for self-supporting may be provided in the lower end of a bag main-body part, and you may enable it to become self-supporting. In this case, it is preferable that the bag body portion is composed of a three-side sealed bag excluding the bottom for self-supporting, because the vertical seal is applied to the left and right side edges of the bag body portion so that the liquid body is packaged in the bag body. Even after gas-less filling of an object with liquid seal filling, etc., the standing figure can be maintained in a flat and flat shape at the top, that is, the flatness of the two plastic films on the front and back of the film check nozzle part (Flatness) increases, which is effective in ensuring the inward check function of the film-like check nozzle part and ensuring that the check function after the liquid package is poured out is maintained. It is because it acts on.

  Next, specific forms of the flexible packaging bag A according to the present invention will be described with reference to the drawings. The flexible packaging bag A shown in FIG. 1 protrudes from the bag body portion 2 formed by superimposing the front and back single-layer films and fusing the outer peripheral portions to each other, and the upper left edge of the bag body portion 2. The film-like check nozzle portion 1 is formed in a state, and these (the film-like check nozzle portion 1 and the bag body portion 2) are each a single-layer film on each of the front and back sides. It is integrally formed.

  Here, the flexible packaging bag A according to this embodiment, as shown in FIG. 2 in an enlarged cross-sectional view along the line III-III in the width direction of FIG. At the outer peripheral edge, a predetermined width, for example, a width of 0.5 to 3.0 mm, preferably a width of 1.0 to 2.0 mm, is preferably fused under a predetermined form by an impulse seal. As a result, it can be manufactured easily, quickly and always reliably.

  In the flexible packaging bag A of the present invention, as shown in FIG. 2, the inner surfaces of the single-layer films 3 and 4 of the flexible packaging bag A, particularly the inner surface of the dispensing passage 8 in the film check nozzle portion 1 are By applying the corona discharge treatment or the like to the surface with enhanced wettability and the wetting treatment layer 11, the inward check function can be effectively exhibited.

Further, in another embodiment of the present invention, in FIG. 3, as shown in the enlarged cross sectional view taken along the width direction of the line III-III in FIG. 1, each of the single-layer film of the front and back, is thicker thickening film 'and, thin thickness thin film 4' 3 is constructed from a.

  In this case, the thin film 4 ′ is composed of, for example, a biaxially stretched PET layer or NY layer of about 30 μm, while the thickened film 3 ′ is composed of, for example, a biaxially stretched PET layer or NY layer of about 80 μm. The

  In this way, by forming the flexible packaging bag A by superposing the thick film 3 ′ and the thin film 4 ′ having different thicknesses, the thick film 3 ′ is the core material particularly in the film check nozzle portion 1. Therefore, the stability (directivity) in the ejection direction is improved without bending or distortion, and the check function is improved by sticking the thin film 4 'so that it sticks to the thick film 3'. Can be made.

  In addition, the thick film 3 ′ and the thin film 4 ′ are made of films having different thicknesses as described above, as well as a film having a high waist (high waist film) and a film having a low waist (low waist film). May be. The stiffness of a single-layer film does not depend only on the thickness of the single-layer film, but also depends on the type of film. For example, even if the thickness is large, even if the thickness is small, There is a single-layer film with high stiffness.

  In addition, the flexible packaging bag A of the present embodiment configured as described above is degassed and packaged by filling the liquid package with liquid seal as described above so that no gas remains in the bag. Filling is necessary in order to cause the self-sealing check function (inward check function) of the film-like check nozzle portion 1.

  And in the film-like non-return nozzle portion 1 in FIG. 1, opening means such as an I notch, a V notch, a U notch, a base notch and a diamond cut are provided at a predetermined opening position (spout port) at the upper edge portion thereof. It is preferable to provide a tear guide rod 1a comprising the tear guide rod 1a.

  Moreover, it is preferable that this film-like non-return nozzle portion 1 is provided with a spire-like protrusion 1b for preventing dripping at a position somewhat closer to the base end side than the planned opening portion of the lower edge portion. The protrusion 1b is provided in order to prevent dripping generated from the opening end of the film check nozzle portion 1 from being transferred from the lower edge portion of the film check nozzle portion 1 to the bag body portion 2. Yes.

  The outer surface of the film-like non-return nozzle portion 1, particularly the outer surface of the single-layer film layers 3 and 4 from the planned tear line (scheduled opening portion) to the base end side, is illustrated with a dot display in FIGS. 1 and 4. As described above, a water-repellent or oil-repellent coating layer (water-repellent or oil-repellent coating layer) 10 for preventing dripping and improving drainage is provided along at least the opening edge and the lower edge. Is preferred (see FIGS. 2 and 3).

  At the same time, the provision of the water-repellent or oil-repellent coating layer 10 on the spire-like protrusion 1b for preventing dripping can further improve the liquid drainage.

  Moreover, as shown as an example in FIGS. 5 (a) to 5 (d), in the vicinity of the film check nozzle portion 1 of at least one single-layer film on either the front or back side of the bag body portion 2, It is preferable to provide the concavo-convex structure 14 by embossing, blasting, etc., whereby the adhesion of the single-layer film based on the capillary action in the vicinity of the film-like check nozzle portion 1 of the bag body portion 2 is slightly relaxed, A smooth flow can be ensured as a whole of the packaged items, and in particular, pouring can be easily performed to the end when the remaining items to be packaged are low. Note that the concavo-convex structure 14 is fixed at about 20 μm so that the concavo-convex positions are fitted to each other as illustrated in the cross-sectional view of the stripe-shaped and dimple-shaped concavo-convex structure in FIG. A combination of the gaps G is desirable.

  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 portion 1. To prevent this, in the present invention, FIG. 1 and FIG. As shown in FIG. 4, a dispensing reservoir for dispensing amount control having a bowl-like spread at a position adjacent to the lower edge of the film-like non-return nozzle portion 1, particularly the valve mounting base end side (bag body side). It is a preferred embodiment that 1c is provided so that the discharge flow is temporarily retained in this zone to prevent unintentional excessive pouring and to provide stable quantitative discharge.

  By adopting such a liquid reservoir 1c, the liquid package guided from the bag body 2 to the dispensing passage 8 of the film check nozzle 1 is temporarily retained in the liquid reservoir 1c and discharged. Since the flow rate generally decreases and then heads toward the slit opening, the excessive outflow can be avoided.

  Further, in conjunction with the formation of the liquid reservoir portion 1c, more preferably, as shown in FIG. 4, the flow-out flow is rectified in the seal portion at the base end position of the film-like check nozzle portion 1. A protrusion (formed by a seal) 15 serving as a damming portion may be provided so as to realize a fixed discharge. In addition, it is preferable to form this protrusion 15 so that it may curve. This projection 15 provides a blocking effect and prevents excessive pouring, and there is no possibility that the discharge flow of the packaged article concentrates on the projection 15 and the seal peels off, and stable quantitative discharge is possible. It becomes possible.

  Further, as shown by a chain line in FIG. 1, the inner surfaces of the two single-layer films 3 and 4 constituting the flexible packaging bag A at the base end position of the film-like check nozzle portion 1 are subjected to an original heat seal. Temporary sealing part 12 is formed by carrying out temporary fusion with the adhesive strength of half or less of intensity. According to this, the inflow of the liquid article to be packed and packaged in the flexible packaging bag A from the temporary sealing part 12 to the tip side of the check nozzle part 1 is surely prevented. Even if the object is heated to 50 to 100 ° C., it is not permanently deformed in the direction in which the discharge passage 8 of the film-like check nozzle portion 1 is inflated, and the film-like check nozzle portion 1 always remains. The function of can be fully exhibited. 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 as described above is to open the film-like check nozzle portion 1 by tearing open the tear guide rod 1a of the film-like check nozzle portion 1, that is, to pour the spout. In the secured state, the liquid package 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 provided in the film-like check nozzle portion 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 interposition of a liquid film made of a liquid package that wets the inner surface of the film-like check nozzle portion 1 By closely contacting the whole under, the outside air is surely prevented from entering the flexible packaging bag A.

  According to this, the liquid packaging to be filled in the flexible packaging bag A by degassing by submerged seal filling or the like is also subjected to shrinkage or collapse deformation corresponding to the amount of liquid packaging to be dispensed. Below, it will be poured out without taking in the outside air in the flexible packaging bag A.

  In addition, after stopping the dispensing of the liquid article to be packaged, the inner surface of the dispensing passage of the film-like non-return nozzle portion 1 is tightly sealed with a non-return function to prevent the outside air from entering the flexible packaging bag A. 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 pouring out the required amount of liquid package in this way, the spout provided at the tip of the film-like check nozzle portion 1 automatically closes and closes in a flexible packaging bag under this condition. Return A to a standing posture.

  Here, the close contact of the film-like check nozzle portion 1 that provides this check function is, as described above, the film-like check nozzle portion 1 is released from the water head pressure, and the single-layer film on the front and back sides. 3 and 4 return to the original shape at the time of manufacture of the film-like check nozzle portion 1, and when the liquid package in the film-like check nozzle portion 1 returns to the bag body portion 2, the single layer on the front and back sides By placing the films 3 and 4 in a reduced-pressure atmosphere, the inner surfaces of the soft single-layer films 3 and 4 are placed in the non-return nozzle portion 1 under the interposition of a liquid package to be adhered to those surfaces. The entire width is performed by, for example, being negatively adsorbed by the capillary action of the liquid package.

  And the close contact closure of the front and back single-layer films 3 and 4 based on such a self-seal check function allows the bag body portion 2 that has been crushed and deformed to move inside the bag body portion 2 based on the inherent elastic restoring force. In the case of a reduced pressure tendency, 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 submerged seal filling causes the self-sealing check action of the film check nozzle portion 1. Although it is necessary to make it possible, 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 the non-return dispensing from the film-like check nozzle portion 1, the upper portion of the bag body portion 2, that is, a position above the film-like check nozzle portion 1. It is preferable that one or more gas reservoir spaces 13 as shown in FIG. 4 are provided in a certain upper horizontal seal portion in the bag width direction as needed.

  Further, another embodiment of the flexible packaging bag A of the present invention shown in FIG. 7 is a self-supporting standing pouch S having a bottom bottom portion 9 at the bottom end (bottom portion) of the bag body portion 2. It is preferable that it is a self-supporting bag formed by fusion-bonding the removed three sides by heat sealing or the like, whereby a vertical seal applied to the left and right side edges after gas-less filling of the liquid package into the bag body. Therefore, since the standing shape is flat and flat at the top, and the bottom can maintain a cylindrical shape, the flatness (flatness) of the two front and back single-layer films 3 and 4 constituting the film check nozzle portion 1 ) Is high, and the self-seal check function can be effectively exhibited.

  In addition, it is preferable that both corners of the bottom of the ship bottom shape are chamfered as shown in FIG. 7 so that the bottom has a gently curved shape with a downward convexity, so that both corners of the bottom touch the floor. Therefore, the entire lower end of the self-standing standing pouch S is attached to the floor surface, so that a self-supporting and stable standing posture can be secured.

  In addition, it is preferable to chamfer both corners of the bottom of the bottom 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 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-like check nozzle part 1a Tear guide rod 1b Dripping prevention protrusion 1c Liquid reservoir part 2 Bag body part 3, 4 Single layer film 3 'Thickened film 4' Thin film 8 9 Bottom portion 10 Water / oil repellent coating layer 11 Wet treatment layer 12 Temporary fusion portion 13 Gas reservoir space 14 Uneven structure 15 Damping portion

Claims (7)

A pair of substantially triangular trapezoidal single-layer films that overlap each other on the front and back, and the outer peripheral portions excluding the dispensing passage portion are fused to each other, and are formed in the dispensing passage portion between the single-layer films. A flat film-like non-return nozzle portion that prevents intrusion of outside air into the bag by interposing a liquid substance in the gap is provided with a soft bag body portion made of a single layer film. In a state of projecting from either one of the side, corner or top position, the front and back are integrally provided by a single single layer film,
One of the film inner surface of at least the film-like non-return nozzle portion is a single layer film of the front and back respectively Ri wet strengthened surface der were wet processed, and superimposing the at least one of thickness and Koshido is flexible packaging bag, wherein Rukoto different. The wet reinforcement surface is any one of a corona discharge treatment surface, a UV ozone treatment surface, a flame treatment surface, a resin coating treatment surface, a metal deposition treatment surface, an electroless metal plating treatment surface, a metal low temperature spray treatment treatment surface, and a plasma etching treatment surface. The flexible packaging bag according to claim 1, comprising one or more processing surfaces . The flexible packaging according to claim 1 or 2 , wherein a boundary between the bag main body portion and a base end portion of the film-like check nozzle portion is temporarily sealed by low-temperature fusion between facing films. bag. The bag main body part is constituted by a single-layer film with a concavo-convex structure at least at the upper part or in the vicinity of the side edge on the film-like non-return nozzle part side of either the front or back single-layer film. The flexible packaging bag according to any one of claims 1 to 3 , wherein the flexible packaging bag is provided. The concavo-convex structure formed on the single-layer film is embossed, blasted, knurled, wrinkled, vertical / horizontal striped into one or both of the front and back single-layer films in the form of a plane, stripe, or stripe. The flexible packaging bag according to any one of claims 1 to 4 , wherein the flexible packaging bag is formed as a partial pattern or a full pattern. The flexible packaging bag according to any one of claims 1 to 5 , wherein a bottom portion for self-supporting is provided at a lower end of the bag main body portion. The bag body portion is edge sealed self-standing bag except for the self-supporting for the bottom, standing figure when the packed material filling top flat, according to claim 6, wherein the lower portion is a cylindrical Flexible packaging bag.

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