JP2011046394A - Flexible packaging bag having film-like non-return valve unit for spouting liquid material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid packaging bag having a film-like non-return valve unit capable of simplifying a manufacturing process by integrating a portion of the film-like non-return valve and a bag body portion with each other by each single laminate film on front and back sides, reducing the cost, and enhancing the adhesiveness and flatness of the two front and back laminate films to effectively demonstrate the non-return function, and having excellent stability (directivity) in the discharging direction of a packaged object. <P>SOLUTION: A flat film-like non-return valve unit in which outer peripheral portions of superposed laminate films are fused to each other, and a liquid material is interposed in a very small space formed between the laminate films to generate the inwardly non-return function for preventing ingress of outside air in the bag is formed by forming one film and integrated with the bag in a projecting manner from a flexible bag body portion consisting of the laminate films. The thickness of the superposed front and back laminate films is different from each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a self-seal that automatically prevents entry of outside air into a bag, which is formed by superimposing two soft and flat plastic laminated films (hereinafter referred to as “laminated films”). The present invention relates to a soft packaging bag for filling a soft liquid material, that is, a flexible packaging bag, which is formed by integrally projecting a film-like check valve portion for discharging a liquid material exhibiting a check function.

  Examples of packaging bags having a self-sealing check function and a film check valve for pouring a liquid material made of a plastic film include those disclosed in Permitted Documents 1 and 2, and are described in these prior arts. The packaging bag is mainly formed with the film check valve and the bag body as separate bodies, and the outermost sealant layer of the film check valve is formed at the side or top position of the bag body, for example, in Patent Document 3 is formed by fusion bonding with the method and apparatus disclosed in FIG.

  The reason why the film check valve and the bag main body are formed separately as described above is that the bag main body needs to use a film having a certain thickness and elasticity to support the weight of the object to be packaged. On the other hand, the film check valve needs to use a thin, flexible film with good wettability that easily causes capillary action in order to effectively exhibit the self-seal check function. For this purpose, the bag main body and the film check valve are separated from each other so that a laminated film having a suitable thickness and stiffness can be selectively used for each part.

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

  The check function of the film check valve disclosed in Patent Documents 1 and 2 is that two plastic laminated films that are flat and in close contact with each other are overlapped to face each other, and between the laminated films that overlap each other The outflow passage formed in the inside is strongly intimately contacted by the liquid action due to the capillary action, and prevents the intrusion of the outside air coming in as it is replaced with the outflow of the contents. The self-sealing check function is used to stop the flow toward the surface. Therefore, as a plastic film used for the film check valve, it is considered preferable to use a thin, flexible and flat film in order to reliably exhibit the above inward check function.

  However, if the film check valve is configured using a thin and flexible laminated film, the adhesiveness between the two laminated films can be improved, while the directivity (discharge directionality) of the valve itself is reduced, In addition, it is difficult to bend the liquid package to be poured out from the bag body, such as being easy to bend, and it is impossible to smoothly and stably pour out in a certain direction. There is a risk that distortion will occur between the laminated films, the flatness will be lost, and by interposing a liquid material at all times, the gap for causing the non-return action cannot be maintained, and the non-return function may be impaired. was there.

  In addition, the conventional packaging bag is mainly composed of a film check valve and a bag main body, and thus a process for fusion-bonding both of them is necessary, and the fusion-bonded portion is peeled off. In order to prevent leakage of a packaged item due to a sealing failure or the like, it is necessary to repeatedly perform heat sealing or the like especially at the end position of the film check valve to increase the bonding strength. Otherwise, there was a risk of bag breaking.

  Further, the film check valve mainly has a three-layer structure of a base film layer and respective sealant layers laminated on both sides of the base film layer. The base film layer and the sealant layer include an adhesive layer and an anchor coat layer. However, when the film check valve and the bag main body are formed as separate parts as described above, the base end side of the film check valve (fusing with the bag main body) The adhesive layer, the anchor coat layer, and the like are exposed in the bag main body, and there is a risk that they will come into contact with the in-bag package. Therefore, from the point of view of safety and hygiene, the base film layer is heated and pressurized by sandwiching the base end of the check valve 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.

  Therefore, the present invention aims to solve the above-mentioned problems of the prior art, and the film check valve portion and the bag body portion are made of a single laminated film on each side. In addition to simplifying the manufacturing process and reducing costs, the film check valve and the bag body are integrally formed by molding a single film. A check valve part that improves the adhesion and flatness (flatness) of laminated films and can effectively demonstrate a check function, and has excellent discharge direction stability (directivity) of the packaged goods. It proposes about the flexible packaging bag formed by forming.

  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, according to the present invention, the outer peripheral portions of the laminated films that overlap each other are fused to each other, and the liquid material intervenes in the minute gaps formed between the laminated films, thereby allowing the outside air to enter the bag. A flat film-like check valve portion that produces an inward check function to block is projected in a state of protruding from one of the side, corner, or top of the soft bag body portion made of laminated film. It is a flexible packaging bag characterized in that it is formed by integrally forming a single sheet of film, and the laminated films on the front and back sides are different in thickness.

In the present invention, the flexible packaging bag is
(1) An inward check that prevents the intrusion of the outside air into the bag by fusing the outer peripheral portions of the overlapping laminated films to each other and interposing a liquid material in a minute gap between the laminated films. A single film is formed with a flat film-like check valve that produces a function protruding from one of the sides, corners, or top of the soft bag body made of laminated film. The laminated film for each of the front and back sides to be stacked must be different in stiffness.
(2) The laminated film has a thickness of 60 μm or more and 250 μm or less, and the smaller thickness of the laminated film has a thickness of 10 μm or more and less than 60 μm.
(3) The laminated film has a low elasticity of 40 mN or more and 600 mN or less, and the low lamination film has a elasticity of 10 mN or more and less than 40 mN.
(4) The base end portion of the film-like check valve portion is such that the sealant layers facing each other are fused at low temperature, and the inner surface of the dispensing passage is temporarily sealed,
(5) The inner surface of at least one of the film-like check valve portions is a wet-strengthened surface that has been wet-treated;
(6) 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,
(7) The wet-strengthening surface is applied to the laminated film on the side having a large thickness or low elasticity, and (8) the wet reinforcement surface is applied to the laminated film on the side having a small thickness or low elasticity. thing,
(9) The bag main body portion is constituted by a laminated film having a concavo-convex structure at least at an upper portion or in the vicinity of a side edge on the film check valve portion side of either the front or back laminated film. That
(10) The concavo-convex structure formed on the laminated film is embossed, blasted, knurled, creased, vertically / 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,
(11) A self-supporting bottom portion is provided at the lower end of the bag body portion;
(12) The bag body portion 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.

  According to the present invention, a packaging bag formed by projecting a substantially triangular film-like check valve portion exhibiting a self-seal check function from the main body is different in at least one of thickness and stiffness. Since it is formed by superimposing a single sheet of plastic laminated film, a laminated film with a large thickness and stiffness (hereinafter referred to as a “thickened film or a high stiffness film”) exhibits a core function, The film check valve portion is not bent or distorted, and the stability (directivity) of the liquid material in the dispensing (discharge) direction can be improved. In addition, a laminated 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 the flatness between the laminated films (flatness). In addition, the check functionality can be further improved.

  In addition, the flexible packaging bag of the present invention is formed integrally with a part that becomes a film check valve, preferably by projecting from the upper part of the side of the bag body part, and forming a single film, Simplifies the manufacturing process and lowers costs by eliminating the need for fusion-bonding the conventional film check valve and bag body and the end face treatment at the base end of the film check valve. can do.

  In the present invention, by applying a wetting process to the inner surface of the dispensing passage of the film check valve portion, a capillary action is applied to the inner surface of the dispensing passage between the two laminated front and back laminated films constituting the film check valve. The liquid package can always be intervened by this, and as a result, a high adhesion force derived from the intermolecular force generated between the films at this time is brought about, and the self-sealing check function of the film check valve is more reliably ensured. It can be demonstrated.

  According to the present invention, this nozzle portion is used when hot-packed or handled by temporarily sealing the inner surface of the base end portion leading to the bag main body portion of the film check valve portion by low-temperature fusion processing in advance. Even if an unexpected force is applied to the film, a film check valve is provided that prevents the inward check function 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 a part of the laminated film of the bag body portion is preferably provided with a striped uneven structure, so that the remaining capacity is reduced particularly at the time of re-pouring and the like and acts on the bag body. Prevents re-pouring failure due to the check function, enabling smooth pouring at any time, so that even when the bag body is crushed and deformed due to the check function, pouring can be easily done to the end. become.

  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 check valve 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 of the laminated film which comprises the flexible packaging bag which concerns on this invention. It is a front view of the state which provided the application layer in the film-like check valve part of the flexible packaging bag concerning the present invention. It is a basic diagram which illustrates the uneven | corrugated processing area | region provided in the 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 flexible packaging bag of the present invention is, for example, a flexible packaging bag made by heat-sealing the laminated films on the front and back sides of a two-layer or three-layer laminated structure. Or at the top, the bag body part and the front and back are each formed by integrally forming a single laminated film, and self-actually exerts a cap action that automatically prevents the outside air from entering the bag. A film check valve portion showing a seal check function is integrally formed in a protruding state.

Such a flexible packaging bag of the present invention has two overlapping sheets (facing the front and back) and a pair of laminated films, for example, a sealant layer such as a polyethylene layer, leaving the top of the bag body part, A flat film check valve portion and a bag main body portion are collectively bonded using a general bag making machine by fusing the peripheral edges of each other by, for example, heat sealing, high frequency sealing, or impulse sealing. Obtained by molding. 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 the present invention is provided, which is provided with a film-like check valve portion having a check function in which a liquid package is liquid-tightly filled.
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).

  The non-return function shown by the film-like check valve portion protruding from the bag body portion of the flexible packaging bag of the present invention is the liquid in the bag body when the packaged article is poured out from the 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 valve of No. 1, it 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 check valve portion has two plastic laminated films that are flat and close to each other facing each other and face each other, and is covered by a capillary action in a minute gap between the overlapping films. A self-sealing non-return function is exhibited by producing an adhesive force derived from intermolecular force caused by the intervening liquid material as a package. As for at least the film-like check valve part, a higher flatness (flatness) has a higher check effect. The gap at the time of superposition | polymerization of the preferable laminated 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 check valve portion and the bag body portion are integrally formed using a single laminated film, and the stability (directivity) in the discharge direction of the film check valve portion is In order to effectively exert the inward check function, as a laminated film on each of the front and back sides constituting the packaging bag, at least one of thickness and / or waist, a thickened film / high waist film, It is proposed to form a packaging bag by using a thin film and a low stiffness film by superimposing these films.

  In this way, the packaging bag is formed by superimposing laminated films having different thicknesses and / or low waists, so that the thicker film or the higher waist film has a larger thickness or higher waist. However, the film-like check valve portion is not bent or distorted, and the directional stability (directivity) at the time of dispensing the package is improved. Moreover, since the thin film / low waist film to be polymerized with this film adheres well to the thickened / high waist film, it is easy to improve the flatness (flatness) of the valve body, and the film check valve The non-return function of the part is effectively exhibited.

  Therefore, each of the two front and back laminated films constituting the flexible packaging bag of the present invention has a two-layer or three-layer structure of a uniaxial or biaxially stretched base film layer and a sealant layer laminated on at least one of the base film layers. Is effective. In this case, the thickness of one laminated film (thickened film) is thicker than the thickness of the other laminated film (thin film). For example, the thick film has a thickness of 60 μm or more and 250 μm or less, preferably 80 to 150 μm, while the thin film has a thickness of 10 μm or more and less than 60 μm, preferably 20 to 40 μm.

  Further, the laminated film of the two front and back surfaces has a waist of one laminated film (high waist film) larger than that of the other laminated film (low waist film), and the waist of the high waist film. Is preferably 40 mN or more and 600 mN or less, and the low waist film having a waist of 10 mN or more and less than 40 mN is preferably used. The waist is the bending strength per unit width (15 mm) of the laminated film, and the waist measuring device (Mini Bear Co., Ltd.) as disclosed in FIG. 10 of JP-A-2005-59958. It is a value measured using a load cell UL-100GR.

  The thickness and stiffness of the laminated film vary depending on the laminated structure of the film and the material of the base film layer and the sealant layer, etc., but the thickness and / or stiffness of the laminated film is the above for the thickened film / high waist film. If the thickness is below the range (thickness: less than 60 μm, waist: less than 40 mN) or exceeds the above range for the thin film / low waist film (thickness: 60 μm or more, waist: 40 mN or more), as described above When the packaged material is poured out, the thick film / high waist film and the thin film / low waist film adhere to each other due to the adhesive force based on the intermolecular force of the liquid package that is always present between the laminated films. In addition, the thick film and the high waist film cannot function as a core material, and the directivity of pouring deteriorates. On the other hand, when the thickness or stiffness of the laminated film exceeds the above range for thickened films and high-waistness films (thickness: more than 250 μm, waist: more than 600 mN), the bending strength becomes too large and the liquid packaging There is a possibility that the adhesion of the inner surface of the film check valve portion after the stop of the material dispensing is impaired, and the check function cannot be effectively exhibited. Moreover, about the thin film and the low waist film, when the thickness or the waist of a laminated film is less than the said range (thickness: less than 10 micrometers, waist: less than 10 mN), there exists a possibility that sufficient intensity | strength cannot be ensured.

  In the thick film / high waist film and thin film / low waist film, the base film layer (supporting substrate) is preferably made of polyethylene terephthalate, nylon, polyester, polypropylene, EVOH, or the like. The sealant layer is preferably composed of polyethylene, polypropylene, ethylene vinyl acetate copolymer layer, ethylene ethyl acrylate copolymer layer, ionomer layer, or the like. In addition, as a film lamination method, the melt extrusion lamination method or dry lamination method with respect to a base film layer, the extrusion lamination method, the coextrusion lamination method, etc. are used.

  Among the laminated films, for the thin film / low waist film, the base film layer thereof preferably has a thickness of 5 to 40 μm, more preferably 10 to 20 μm. If the thickness of the base film layer is less than 5 μm, water vapor impermeability, gas barrier properties and the like are insufficient, and in some cases, the capillary action may be deteriorated due to evaporation of the liquid (when not used for a long time). On the other hand, if the thickness exceeds 40 μm, the bending strength may be too high. The sealant layer preferably has a total thickness of 5 to 200 μm. If the thickness is less than 5 μm, sufficient seal strength may not be ensured. On the other hand, when it exceeds 200 μm, the bending strength of the laminated film may be excessively increased. Note that the sealant layer may be composed of two or more layers as long as the total thickness is within the above range.

In general, a film with a high degree of elasticity is a thickened thick film, while a film with a low degree of elasticity is often a thin film with a small thickness, but in either case, the base film is located on the outer surface. It is also possible to use a suitable intermediate layer interposed between the layer and the sealant layer located on the inner surface. For example, for the base film layer, use is made by forming a gas barrier layer composed of a SiO ₂ vapor deposition layer, a vinylidene chloride coating layer, an aluminum oxide coating layer, an Al vapor deposition layer, or a sputtering layer thereof on one of the surfaces. It is preferable. This makes it difficult for the film-like check valve portion wetted by the package to dry, and as a result, the inner surfaces come into close contact with each other, and water vapor impermeability, gas barrier properties, and the like are imparted. The package can be stored without deterioration over a long period of time, and the entry of outside air into the packaging bag can be effectively prevented. The thickness of the gas barrier layer is preferably about 0.5 to 20 μm.

  Moreover, in this invention, the intermolecular force which acts between the films for producing the inward non-return function mentioned above is formed in the inner surface of at least any one of the front and back laminated films constituting the flexible packaging bag. It is effective to perform a wetting treatment in order to make the adhesive force generated by the liquid substance more reliable. In particular, it is preferable to provide this wetting surface on the inner surface of the dispensing passage of the film check valve portion. The adhesive force derived from the intermolecular force generated by the liquid package always intervening on the inner surface of the dispensing passage between the front and back two laminated films constituting the film check valve portion by capillary action. This is because the inward check function (prevention of outside air from entering the bag) described above can be more reliably exhibited.

  The wetting treatment is, for example, a corona discharge treatment, a UV ozone treatment, a flame treatment, a resin coating treatment such as an acrylic resin or cellulose, or a metal vapor deposition on the surface of a sealant film of a laminated film made of PE, PP, EAV, ionomer or the like. Physical surface modification of the film surface and chemical surface modification by the generation of polar functional groups by applying wetting treatments such as treatment, electroless metal plating treatment, metal low-temperature spraying treatment, plasma etching treatment, etc. Is a treatment for improving the wettability of the film, and the film surface subjected to this treatment is referred to as a wet treatment 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) is applied to the inner surface of the dispensing passage (inner surface of the sealant film) of the film-like check valve portion of the flexible packaging bag using the laminated film of the three-layer structure of LLDPE15 / PET12 / LLDPE20 : Discharge amount 81.7 W · min / m ² ), and the wetting tension of the inner surface 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.

  By the way, the film check valve portion formed integrally and projecting from the bag body portion of the flexible packaging bag according to the present invention is a film valve opening in the bag body portion in the vertical direction, that is, the length of the spout edge portion. Is preferably about 5 to 100 mm regardless of the number of laminated films. 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 film valve opening edge, with respect to the width direction of the laminated 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 provided on at least the outer surface of the opening (pouring) of the film check valve portion, that is, the outer surface in the vicinity including the planned opening portion. It is preferable to provide it. When such a treatment is applied to the film check valve portion, so-called liquid drainage is improved when returning the packaging bag to an upright position and stopping 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 valve 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 check valve portion projecting integrally from 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 opening One provided with a water-repellent layer coated with silicone oil as a coating agent on the lower edge of the bag body part from the planned part (scheduled outlet line part) and one not provided with a water-repellent layer (invention compatible example) Two types of comparative examples were prepared. 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 valve portion toward the base end side. This dripping prevention protrusion causes the dripping generated from the spout of the film check valve portion to flow down the protruding portion before reaching the side portion 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 check valve portion has a protrusion length X from the bag main body portion of about 30 to 100 mm and a valve width (a slit opening position) of about Y = 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 is provided on at least one inner surface of the front and back laminated films. It is preferable to use a portion having a concavo-convex structure subjected to any one of roughening processing such as embossing, blasting, and knurling, random wrinkle processing, and vertical / 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 body part is that the film-like check valve portion only has a non-return action after the liquid package is poured out by the action of the film-like check valve portion. In addition, the bag main body portion is also prevented from invading (backflowing) outside air, and is in a tightly adhered state (checking action) between these laminated films under the presence of a liquid substance due to the capillary action. In particular, the inside of the bag body is in a strongly fused state due to shrinkage of the laminated 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 filled liquid package is to be poured out again through the film-like check valve portion, there is a sufficient amount of liquid (liquid height) in the bag body (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 laminated films. Smooth pouring and liquid return become impeded.

  In particular, when the amount of liquid in the bag is reduced, wrinkles are generated in the bag main body part, which causes a weir 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 adhesive force of the laminated film based on the capillary action in the vertical and horizontal ranges at least in the vicinity of the film-like check valve portion of the bag body portion. In order to prevent 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 main body portion, the check valve portion of the film check valve In order to alleviate without lowering the action, it is preferable that at least one of the laminated films on the front and back of the bag body part is preferably provided with a concavo-convex structure consisting of a linear or curved stripe pattern, particularly in the bag body part. The capillary action is weakened.

  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 bag main body part (excluding vertical seal, horizontal seal, joint seal part between the valve and the main body), that is, the thickness of the liquid layer is usually Although the adhesive force based on the capillary action described above is generated at about 2 to 5 μm, one or both of the laminated films are embossed, for example, and the gap between the films is 20 μm or more, preferably 30 μm or more, More preferably, concavities and convexities are provided so as to be 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 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.

  The inventors have filled a flexible packaging bag having a laminated film structure of NY15 vapor-deposited surface / PET12 vapor-deposited surface / XA-HD40 with a soy sauce as a package to be sealed in a liquid, and tilted to discharge the package. Then, an experiment was carried out to measure the remaining amount when the packaged items were not delivered. 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 check valve portion in the bag main body portion, a comparison was made between those provided with a stripe-like 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 the bag body portion and the dispensing passage of the film check valve portion, that is, at least a part of the non-seal portion, for example, the formation position thereof is at least the film body check portion of the bag body portion. Striped concavo-convex structure provided in the film check valve part or a striped concavo-convex structure provided in the bag body part so as to continue from the side edge on the valve part side to the dispensing passage of the film check valve part And may be provided in a substantially continuous (consecutive) continuous manner. In this way, not only the bag body portion but also the film check valve portion is provided with a concavo-convex structure, which is effective for securing a flow path during re-pouring. The concavo-convex structure is a laminated film in which a striped concavo-convex pattern is applied in the form of a planar or island-shaped partial pattern or a full-pattern, and a roughened surface of an opposing sealant film is dry laminated or coextruded. Can also be used.

  By the way, the concavo-convex structure for ensuring smooth pouring of the liquid package filled in the flexible packaging bag with a seal in the liquid extends from the bag body portion to the tear opening position of the film check valve 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 check valve portion even when the liquid package in the flexible packaging bag is small. In addition, it is effective in eliminating the damming on the way due to the folding back of the film, etc., from the bag main body portion to the tear opening portion of the film check valve portion.

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

  In this case, the film-like check valve portion is a film-liquid produced by constantly interposing the liquid material by pressurizing the body portion body portion 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 (pour spout) of the film check valve portion, the bag body portion made of a soft laminated film is in spite of the liquid package being poured out. Since the check valve part has a self-seal check function (air does not enter the bag body in place of the liquid package to be poured out), the outside air is not sucked in (back flow). The main body portion is successively contracted or crushed and deformed by an amount corresponding to the extracted volume.

  Thus, after filling the flexible packaging bag with the liquid material, by tilting it under the opening of the film check valve portion, the required amount of liquid packaged material is poured out from the bag, And the outflow of this liquid to-be-packaged item from the opening part of a film-like check valve part stops by returning this 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 valve 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 valve part closely adheres to each other at the same time as it stops, so it is provided at the tip of the film check valve part. 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 valve portion, the liquid packaged material filled in the bag is completely blocked from the 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 laminated films constituting the film check valve portion, the capillary tube Depending on the phenomenon, liquid substances are always present. That is, the inward check function (the function of preventing the outside air from entering the bag) due to the two laminated films being in close contact with each other, the film check valve portion is caused by the rising and returning of the flexible packaging bag. In addition to being released from the action of water head pressure and returning to the original shape at the time of manufacture, when a part of the liquid package in the film check valve part returns to the bag body, the liquid package is reduced by pressure reduction. The inner surfaces (pouring passages) of the pair of front and back films wetted by each other 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 check valve has excellent self-seal reversal by the stand-alone return of the flexible packaging bag and automatic close-sealing (self-sealing) of the spout opening, which is a tear opening, 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 check valve 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 check valve portion, the sealant layer on each inner surface of the laminated film of the front and back two laminated films is provided. It is preferable that the adhesive strength is not more than half of the original heat seal strength and the state is temporarily fused at a relatively low temperature (temporary sealing portion).

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

  By the way, in forming the temporary sealing portion, the formation position can be the base end position of the film-like check valve portion projecting from the bag body portion, and the bag body rather than the position. The position may be slightly deviated toward the inside of the part, or conversely, slightly deviated from the position to the outside of the bag body portion. And in any of these cases, a packaged dispensing passage forming portion having a length (about 5 to 80 mm) sufficient for the film check valve portion to perform its original function, It is necessary to remain outside the low-temperature temporary fusion portion, that is, the temporary sealing portion (the front end side of the check valve 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 projecting base end position of the film check valve portion. The inflow from the stop portion to the check valve portion tip side 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 portion of the film check valve portion on the tip side from the temporary sealing portion can always fully exhibit the function of the film check valve portion, and can be used for dispensing the packaged items from the packaging bag. 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 check valve portion 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 check valve portion that has not been subjected to the full deformation due to the heated packaged object is caused by the intrusion of the outside air into the bag due to the extraction of the packaged item in the bag, and the bag body part is crushed and deformed. 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 the product with liquid seal, etc., the standing figure can be maintained flat and flat at the top, that is, the flatness of the two plastic films on the front and back of the film check valve (Flatness) becomes higher, which is effective for ensuring the inward check function of the film check valve part and for reliably maintaining the check function after the liquid package is poured out. 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 has a bag body part formed by superimposing laminated films on both the front and back sides and the outer peripheral parts fused together, and a state protruding from the upper left edge of the bag body part 2. The film check valve portion 1 is formed, and these (the film check valve portion 1 and the bag body portion 2) are integrally formed with one laminated film on each of the front and back sides. Has been.

  Here, the flexible packaging bag A according to this embodiment is, as shown in FIG. 2, an enlarged cross-sectional view taken along the line III-III in the width direction of FIG. However, the thick film 3 is thick and the thin film 4 is thin. Each film 3, 4 has a two-layer structure of a base film layer 5, 5 ′ and a sealant layer 6, 6 ′ laminated on the inner surface side of the base film layer 5, 5 ′. The sealant layers 6 and 6 'on the side have a predetermined width, for example, a width of 0.5 to 3 mm, preferably a width of 1.0 to 2.0 mm, at the outer peripheral edge portion, preferably under a desired shape by heat sealing. As a result, it can be manufactured easily, quickly and always reliably.

  The thin film 4 is formed by laminating a base film layer 5 made of a biaxially stretched PET layer or NY layer of about 12 μm, for example, and an unstretched film of about 10 to 15 μm, for example, on the inner surface of the base film layer 5. Consists of a PE layer or a PP layer 6, while the thickening film 3 is laminated on a base film layer 5 ′ made of, for example, a biaxially stretched PET layer or NY layer of about 20 μm and an inner surface of the base film layer 5 ′. For example, it is constituted by an unstretched PE layer or PP layer 6 ′ of about 20 to 30 μm.

  In this way, by forming the flexible packaging bag A by overlapping the thick film 3 and the thin film 4 having different thicknesses, the thick film 3 becomes a core material and bends particularly in the film check valve portion 1. In addition, the stability (directivity) in the ejection direction is improved, and the thin film 4 sticks to the thick film 3 so that the check function can be improved.

  In addition, the thick film 3 and the thin film 4 may be made of films having different thicknesses as described above, and may be a film having a high waist (high waist film) and a film having a low waist (low waist film). Good. The stiffness of the laminated film does not depend only on the thickness of the laminated film, but also depends on the type of film and the laminated structure. For example, even if the thickness is large, the laminated film with a low stiffness or the thickness is small. There is a laminated film with a 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. It is necessary to fill the self-seal check function (inward check function) of the film check valve portion 1.

  In FIG. 1, the film check valve portion 1 has opening means such as an I notch, a V notch, a U notch, a base notch, and a diamond cut at a predetermined opening position (spout port) of the upper edge portion in FIG. It is preferable to provide a tear guide rod 1a comprising the tear guide rod 1a.

  In addition, the film check valve portion 1 is preferably provided with a spire-like protrusion 1b for preventing dripping at a position slightly closer to the base end side than the planned opening portion at the lower edge thereof. This protrusion 1b is provided in order to prevent dripping generated from the opening end of the film check valve portion 1 from being transferred from the lower edge portion of the film check valve portion 1 to the bag body portion 2. Yes.

  The outer surface of the film-like check valve portion 1, that is, the outer surface of the base film layers 5 and 5 ′ from the planned tear line (scheduled opening portion) to the base end side is illustrated with a dot display in FIGS. 1 and 3. 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.

  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 in FIG. 2, the surface of the inner surface side sealant layers 6 and 6 'of the flexible packaging bag A, particularly the inner surface of the dispensing passage 8 in the film check valve portion 1 is subjected to corona discharge treatment or the like. It is preferable that the wettability-enhanced surface and the wetting layer 11 be used, and thereby the inward check function can be effectively exhibited.

  Moreover, as shown as an example in FIGS. 4A to 4D, in the vicinity of the film check valve portion 1 of at least one of the laminated films on the front and back of the bag body portion 2, striped processing, It is preferable to provide the concavo-convex structure 14 by embossing, blasting, and the like, and thereby the adhesion of the laminated film based on the capillary action in the vicinity of the film check valve portion 1 of the bag body portion 2 is slightly relaxed, and the package 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. Note that the concavo-convex structure 14 is fixed at about 20 μm so that the concavo-convex positions are shifted and fitted, as illustrated in the stripe-shaped and dimple-shaped concavo-convex structure cross-sectional view of FIG. 5A. 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 valve portion 1, and in order to prevent this, in the present invention, FIG. As shown in FIG. 3, a liquid storage portion for dispensing amount control having a bowl-like spread at a position adjacent to the lower edge of the film check valve 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 valve 1 is temporarily retained in the liquid reservoir 1c and discharged. Since the flow rate generally decreases and then heads toward the tear 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. 3, the flow of flow into the seal portion at the base end position of the film check valve portion 1 is aimed at rectification. 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 damming portion 15 has a damming effect and can prevent excessive pouring, and there is no possibility that the discharge flow of the article to be packed concentrates on the projection 15 and the seal peels off, so that stable quantification is possible. Discharge becomes possible.

  In addition, as shown by a chain line in FIG. 1, the inner sealant layers 6 and 6 ′ of the two laminated films that constitute the flexible packaging bag A at the base end position of the film check valve portion 1 are originally The temporary sealing portion 12 is formed by temporary fusion bonding with an adhesive strength that is half or less of the heat seal strength. According to this, the inflow of the liquid packaging material filled and packaged in the flexible packaging bag A from the temporary sealing portion 12 to the front end side of the check valve portion 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 dispensing passage 8 of the film check valve portion 1 is inflated, and the film check valve 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 flexible packaging bag A shown in FIG. 1 constructed as described above is used to open the film check valve portion 1 by tearing open the tear guide rod 1a of the film check valve portion 1, that is, to spout 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 check valve 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 check valve 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.

  Furthermore, after the liquid package is stopped, the inner surface of the discharge passage of the film check valve portion 1 is tightly sealed with a check 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 check valve portion 1 automatically closes and closes in a flexible packaging bag under this condition. Return A to a standing posture.

  Here, the close contact closing of the film check valve portion 1 that provides this check function is performed by releasing the film check valve portion 1 from the hydrocephalic pressure as described above, so that the laminated film 3 on the front and back sides. 4 is restored to the original shape at the time of manufacture of the film-like check valve portion 1, and when the liquid package in the film-like check valve portion 1 is returned to the bag body portion 2, the laminated film 3 on the front and back sides 4 is placed in a reduced-pressure atmosphere, so that the inner surfaces (sealant layers 6 and 6 ') of the soft laminated films 3 and 4 are reversed in the form of a film under the intervention of a liquid package to be adhered to those surfaces. The entire width of the stop valve portion 1 is performed by, for example, being negatively adsorbed by the capillary action of the liquid package.

  Then, the close contact between the front and back laminated films 3 and 4 based on such a self-seal check function is such that the bag body portion 2 that has been crushed and deformed is decompressed in the bag body portion 2 based on the inherent elastic restoring force. In the case of a trend, it will be maintained more reliably.

  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 valve 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 check valve portion 1, the upper portion of the bag body portion 2, that is, a position above the film check valve portion 1. It is preferable that one or more gas reservoir spaces 13 as shown in FIG. 3 are provided in a certain upper lateral 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. 6 is a self-supporting standing pouch S having a ship bottom bottom 9 at the bottom end (bottom) 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 laminated films 3 and 4 constituting the film check valve portion 1 The self-sealing check function can be effectively exhibited.

  Moreover, it is preferable that both corners of the bottom of the ship bottom shape are chamfered as shown in FIG. 6 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 check valve part 1a Tear-inducing ridge 1b Dripping prevention protrusion 1c Liquid reservoir part 2 Bag body part 3 Thickened film 4 Thin film 5 5 'Base film layer 6, 6' Inner sealant Layer 8 Dispensing passageway 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 (13)

An inward check that prevents the intrusion of the outside air into the bag by fusing the outer peripheral portions of the overlapping laminated films to each other and interposing a liquid material in a minute gap formed between the laminated films. A single film is formed with a flat film-like check valve that produces a function protruding from one of the sides, corners, or top of the soft bag body made of laminated film. A flexible packaging bag in which the laminated films on the front and back surfaces are different in thickness from each other. The outer peripheral portions of the overlapping laminated films are fused to each other, and a liquid material is interposed in the minute gap between the laminated films, thereby generating an inward check function for preventing the outside air from entering the bag. A flat film-like check valve portion is molded from one side, corner, or top of a soft bag body made of a laminated film, and a single film is molded and integrated. 2. The flexible packaging bag according to claim 1, wherein the laminated films on each of the front and back surfaces are different in stiffness. 3. The laminated film having a thickness of 60 μm or more and 250 μm or less, and a film having a smaller thickness of 10 μm or more and less than 60 μm. The flexible packaging bag as described in. The laminated film is characterized in that the laminated film on the side having the higher waist has a waist of 40 mN or more and 600 mN or less, and the laminated film on the side of the lower waist has a waist of 10 mN or more and less than 40 mN. The flexible packaging bag of any one of 1-3. The base end portion of the film-like check valve portion is such that the sealant layers facing each other are fusion-bonded at a low temperature, and the inner surface of the dispensing passage is temporarily sealed. The flexible packaging bag as described in the item. The flexible packaging bag according to any one of claims 1 to 5, wherein at least one inner surface of the film check valve portion is a wet-strengthened surface that has been wet-treated. 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. It consists of one or more processing surfaces, The flexible packaging bag of any one of Claims 1-6 characterized by the above-mentioned. The flexible packaging bag according to claim 6 or 7, wherein the wet-strengthening surface is provided on a laminated film having a larger thickness or stiffness. The flexible packaging bag according to claim 6 or 7, wherein the wet-strengthened surface is provided on a laminated film having a smaller thickness or stiffness. The bag body portion is constituted by a laminated film having a concavo-convex structure at least on the upper side or in the vicinity of the side edge on the film-like check valve portion side of the laminated film on either the front or back side. The flexible packaging bag according to any one of claims 1 to 9. 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 any one of claims 1 to 10, 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 1 to 11, wherein a bottom portion for self-supporting is provided at a lower end of the bag main body portion. 13. The flexible packaging bag according to claim 12, wherein the bag main body part is a three-side seal self-supporting bag excluding the bottom part for self-supporting, and the standing figure is flat at the upper part and cylindrical at the lower part.

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