JP2012025438A - Self-standing bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-standing bag relating to a packing container for accommodating liquid, solid-liquid mixture, viscous body, powder, solid, or the like that prevents contents from remaining when taking the contents out of the bag, can be refilled with the contents, and of which a volumetric capacity can be increased by being formed in a pseudo-cylindrical shape.SOLUTION: The self-standing bag (a standing pouch) is formed of three parts in total including a bottom film and two front and back body films. The two front and back body films has a folding structure so as to form the pseudo-cylindrical shape, and therefore, the volumetric capacity can be increased and the content can be prevented from remaining in the bag.

Description

      The present invention relates to a self-supporting bag for storing a liquid, a solid-liquid mixture, a viscous body, a powder, a granule, a solid and the like.

    Conventionally, as a packaging container for storing a liquid, a solid-liquid mixture, a viscous body, a powder, a granule, a solid, etc., a soft packaging container composed of a plastic film or the like is often used.

  However, the flexible packaging container is excellent in flexibility, but it is poor in forming as a container and has problems such as independence at the time of product display.

    In recent years, many countermeasures have been taken against these problems, and in particular, countermeasures in the form of flexible packaging containers have been attempted, and self-standing bags (standing pouches) have been widely used. Many of its shapes are trihedral structures with folds at the bottom, and therefore consist of a lengthy package shape to increase volume. Furthermore, an attempt is made to increase the self-supporting property and the capacity by forming a fold-like cylinder by vertically folding it (Patent Document 1).

  However, in the case of the self-supporting bag described in Patent Document 1, a leftover occurs when the contents are taken out, and a new problem arises for the consumer in the loss of the contents and the processing of the residuals at the time of disposal.

JP 2009-220868 A

    The present invention relates to a self-supporting bag for storing contents such as liquids, solid-liquid mixtures, viscous bodies, powders, granules, solids, etc., and there is no leftover when the contents are taken out, and the contents can be refilled, Another object of the present invention is to provide a self-supporting device characterized in that the volume can be increased by forming a pseudo-cylindrical shape.

  The present invention is for solving the above problems, and the invention according to claim 1 of the present invention is a self-supporting bag formed by sealing a folded bottom member and two front and back body members. The two body members are self-supporting bags characterized in that they protrude outward and have lateral folding portions at positions facing each other.

  The invention according to claim 2 of the present invention is the self-supporting bag according to claim 1, wherein the folding portion is disposed downward.

  The invention according to claim 3 of the present invention is the self-supporting bag according to claim 2, characterized in that the folded portion disposed downward is pasted to an opposite body member.

  The self-supporting bag of the present invention is composed of three parts, a bottom member and a front and back body member, and the contents of the two front and back body members protrude outwardly and are provided with lateral folding portions facing each other. When filling an object, the folded portion expands to form a cylindrical shape, thereby providing a great effect that the internal volume can be increased as compared with the conventional three-part free-standing bag.

  In addition, by having the folded portion facing downward, it is possible to prevent the contents from being left behind when the contents are taken out, and it is easy to discard the container and is suitable for refilling purposes.

(A) It is a perspective view which shows an example of the self-supporting bag of this invention. (B) It is sectional drawing which shows an example at the time of filling of the self-supporting bag of this invention. It is a perspective view which shows an example at the time of filling of the self-supporting bag of this invention. It is sectional drawing which shows an example at the time of filling of the self-supporting bag comprised from 4 parts.

  An embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 (a) is a perspective view of a self-supporting bag composed of three parts showing an embodiment according to the present invention, and FIG. 1 (b) is a self-supporting composed of three parts showing an embodiment according to the present invention. It is sectional drawing at the time of filling of a bag.

  A self-supporting bag according to an embodiment of the present invention is a self-supporting bag for storing contents such as a liquid, a solid-liquid mixture, a viscous body, a powder, a granule, and a solid, and includes a bottom member 2 shown in FIG. And consists of three parts of two front and back body members 1 shown in FIG. 1B, and is formed by a standing pouch type.

  As shown in FIG. 1 (a), the two front and back body members 1 are provided with a folding portion 1a in which both ends are sealed 1b in the horizontal direction in advance in the middle portion, and FIG. 1 (b). As shown, the bottom member 2 is a self-supporting bag having an upward folding structure.

  After filling the contents, as shown in FIG. 1B, the upper part of the self-supporting bag is sealed using means such as a heat seal method or an ultrasonic seal method, and the filling is completed.

  According to the present invention, as shown in FIG. 1 (b), when the contents are filled, the folding portion 1a expands according to the filling amount of the contents to form a pseudo-cylindrical shape, thereby increasing the volume. I can do it.

  Moreover, when taking out the contents, since the folding part 1a faces downward, it is possible to prevent the leftover.

  On the other hand, the pseudo-cylindrical self-supporting bag composed of four parts shown in FIG. 3 can increase the volume, but on the other hand, when the contents are taken out from the spout part 5, the spout part 5 is directed downward. From the necessity, a liquid pool is generated at the upper end portion of the top plate 3, and as a result, the contents are left behind.

Further, since the folding part 1a is formed so as to protrude outward from the self-supporting bag, the folding part 1a contacts the corrugated cardboard wall surface when being packed in the cardboard for transportation or at the time of transportation if it is floating from the trunk member. For example, there is a problem of scratches.

  In the present invention, by sticking the folded portion 1a arranged downward to the facing body member, it is possible to reduce the contact of the folded portion 1a with the cardboard wall surface during packing into the cardboard for transportation or during transportation. Can do. Here, as a method of sticking the folded portion 1a arranged downward to the body member facing each other, a method using a point seal can be used, but the method is not limited thereto.

  Next, the material configuration of various members forming the self-supporting bag of the present invention will be described. The bottom member 2 and the front and back body members 1 are composed of a laminated film including at least an outermost film base material and an innermost sealant layer.

  Examples of the outermost film base material include polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE) and polypropylene (PP), and nylon- 6. Polyamide (PA) such as nylon-66, polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyvinyl alcohol (PVA), ethylene- A stretched or unstretched film such as vinyl alcohol copolymer (EVOH), polyether sulfone (PES), polymethyl methacrylate (PMMA), or the like can be used.

  The thickness of the film substrate is preferably in the range of 3 to 200 μm in view of workability, and more preferably in the range of 6 to 30 μm in view of quality reliability and cost.

  Next, the innermost sealant layer includes, for example, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a high density polyethylene resin (HDPE), a linear low density polyethylene resin (L-LDPE), and a polypropylene. Plain resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic acid Resin such as ester copolymer, ethylene-acrylic acid ester copolymer, ionomer resin, ethylene-vinyl acetate copolymer (EVA), or a film obtained by forming a film of these resins can be used.

  The thickness of the sealant layer is preferably in the range of 15 to 200 μm in view of strength and workability, and more preferably in the range of 30 to 170 μm in view of quality reliability and cost.

  The method of laminating the outermost film base material and the innermost sealant layer is, for example, using a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, an extrusion lamination method, and the extrusion lamination method. A known method such as a sandwich lamination method can be used.

  For example, the dry lamination method includes three sections: a coating portion for applying an adhesive on a film, a drying portion, and a nip roller portion, and an unwinding, winding, and tension control system. The coating portion generally employs a gravure coating method or a reverse roll coating method.

As the adhesive used in the dry lamination method, laminate adhesives such as polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, and cellulose can be generally used.

  As the laminating adhesive, a solvent-type adhesive or a solvent-free adhesive is used. However, when a solvent-free adhesive is used, a drying section is unnecessary, and in particular, a non-solvent dry lamination method and I'm calling.

  The hot melt lamination method is a method in which a hot melt adhesive such as a heat-melted ethylene-vinyl acetate copolymer (EVA) is applied on a film, and another film is immediately laminated.

  In the extrusion lamination method, a thermoplastic resin such as a polyethylene resin or a polypropylene resin is heated and dissolved in a cylinder, extruded under pressure with a screw, and made into a curtain shape from a slit of a T die at the tip of the cylinder. This is a method in which a melted resin is extruded and laminated into a film.

  At this time, using the extrusion lamination method, a sandwich lamination method is used in which a thermoplastic resin such as polyethylene or polypropylene is used instead of an adhesive, and an outermost film base material and an innermost sealant layer are laminated. You can also

  In addition, you may provide the printing layer for providing the designability to the said film base material. When a printing layer is provided on a film substrate, printing can be performed on either the front or back of the film substrate surface. In general, considering the friction resistance, weather resistance, etc. of the ink, It is preferable to provide a printing layer on the back surface (inner surface).

  Further, in order to improve the adhesion of the printed layer, it is preferable to perform a pretreatment such as ozone treatment or corona treatment on the surface of the film base, and if necessary, an anchor coating agent may be applied. .

  Examples of the anchor coating agent include general-purpose anchor coating agents such as isocyanate (urethane), polyethyleneimine, polybutadiene, and organic titanium, or polyurethane, polyacryl, polyester, epoxy, and polyvinyl acetate. In addition, an adhesive for laminating such as cellulose can be used.

  As the method for applying the anchor coating agent, a known gravure coating method, bar coating method, dropping method, reverse roll coating method, or the like can be used.

  Hereinafter, specific examples of the present invention will be described.

<Example 1>
The laminated film constituting the bottom member and front and back body members of the self-supporting bag of the present invention uses biaxially stretched polyethylene terephthalate (PET) having a thickness of 12 μm as the outermost film base material, and has a thickness as the innermost sealant layer. A 50 μm low density polyethylene film (LDPE) was used and produced by a dry lamination method through a urethane adhesive.

  Using the film base material, a self-supporting bag composed of three parts of a bottom film and front and back body film was manufactured by the following method.

First, the front and back body members are die-cut into a predetermined shape, then the folding part is formed, then the folded bottom member is inserted into the front and back body members, and then the upper filling port is inserted. The surrounding area was sealed.

  Next, water was filled as a liquid content, and then the upper open portions of the front and back body members were overlapped and sealed by heat sealing, and the content filling and sealing process into the self-supporting bag was completed.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A standing pouch was produced in which the upper and lower members folded in two and the front and back body members were sealed, and the upper member and one of the body members were sealed.

  The above standing pouch was filled with the same contents as in Example 1 and sealed.

<Comparison result>
Below, the comparative result of an Example and a comparative example is demonstrated.

  As a result of comparing the liquid state in the free standing bag after the contents filled in the free standing bags of Example 1 and Comparative Example 1 were taken out from the upper opening of the free standing bag, in Comparative Example 1, the free standing bag was left as it was. In the first embodiment of the present invention, there was no liquid residue so that there was no problem even if it was discarded as it was, and a good result was shown.

DESCRIPTION OF SYMBOLS 1 ... Front and back body member 1a ... Folding part 1b ... End seal part of a folding part 2 ... Bottom member 3 ... Top plate material 4 ... Sealing part 5 ... spout part

Claims (3)

  In the self-supporting bag formed by sealing the folded bottom member and the two front and back body members, the two front and back body members protrude outward and have lateral folding portions at positions facing each other. A free-standing bag characterized by that.   The self-supporting bag according to claim 1, wherein the folding portion is disposed downward.   The self-standing bag according to claim 2, wherein the folding portion disposed downward is stuck to a body member facing each other.

Images