JP2002210844A - Method for manufacturing bag-shaped container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of simply manufacturing a bag-shaped container using a thin material by an automated process. SOLUTION: In the method for manufacturing a bag-shaped container formed from a multilayered laminated sheet, the bottom wall part 4 of a sheet 15, wherein a pair of planar parts 2 and 2', the bottom wall part 4 positioned between the planar parts and a pair of side wall parts are integrally formed, is folded into a pantagraph like side surface shape by a pair of trough fold lines 12 and 12' laterally traversing the boundaries of the planar parts and the bottom wall part, a central trough fold line 14 for laterally bisecting the bottom wall part and two chevron fold lines 13 and 13' for laterally bisecting the areas between these trough fold lines. A pair of the side wall parts are vertically folded double to be folded inwardly and, subsequently, one planar part is erected along the trough fold line 14 of the bottom wall part to be folded back to the other planar part to form a bag-shaped article and the inner surfaces of the end edges excepting the opening end part side of the bag-shaped article are thermally bonded to each other to form thermal adhesive parts to the end edges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a self-supporting bag-like container for filling a liquid beverage such as sports drink or juice, and more particularly to a bag-like container which can be efficiently produced by automation. And a method for producing the same.

[0002]

2. Description of the Related Art A pair of flat portions constituting the front and rear surfaces of a bag-like container, a pair of side walls which are folded inward and adhered between the flat portions, and a pair of side portions formed between the flat portions and the side walls. A bag-like container with a bottom forming sheet adhered so as to cover one end,
By providing the side wall portion, the volume can be larger than that of the bag-shaped container not provided with the side wall portion, and when the contents are packed, the overall shape is squared, and when packing the bag-shaped container, The gap between each container can be reduced.

A bag-like container having the above-mentioned side wall and a method for manufacturing the same are disclosed in Japanese Patent Laid-Open Publication No. Hei 5-221451. The part and the bottom forming sheet are horizontal, and the self-standing stability is excellent.

[0004] The above-mentioned bag-shaped container has excellent self-standing stability, but when the bag-shaped container is lifted by hand, the bottom wall portion is a horizontal surface, so that the weight of the contents is kept flat with the bottom wall portion. It will be supported by the bottom heat seal part, the bottom wall part is easily bent downward,
There is a problem with the shape retention of the bottom, which hinders the manufacture of the bag-like container from thin materials. In addition, the manufacturing method requires a step of making a cut in the seal portion between the bonded flat surface portion and the side wall portion, and a process of folding and expanding the cut side wall portion outward.

The applicant of the present invention has filed a patent application (Japanese Patent Application No. 2000) for an invention of a manufacturing method capable of manufacturing a bag-like container having good shape retention and self-standing stability by using a thin material in an automated process. -128620). In the invention of the prior application, the pair of flat portions and the bottom portion are formed at a portion forming the bottom wall portion of an integrated band-shaped multilayer laminate sheet forming a pair of flat portions and a bottom wall portion located between the pair of flat portions. A pair of folds that traverse the wall in a lateral direction, a fold that horizontally divides a bottom wall sectioned by the pair of folds, a point on the fold and the plane portion Forming a fold habit symmetrically in the lateral direction of the bottom wall portion, the fold habit connecting the side edge portions of the pair of fold habits transversely intersecting the bottom wall portion, and forming the bottom wall portion in the lateral direction. A step of folding the outer surface side of the bottom wall portion along the folding habit and bisecting the two at the same time, and a step of folding the inner surface side of both side edges together with the palm side, and covering the folded bottom wall portion so as to cover the folded bottom wall portion. Folding a pair of flat portions along a folding habit, and turning each side wall portion that is vertically folded in half toward the fold. A step of sandwiching the folded flat portion and the bottom wall portion from each other at the joint portion of the folded side portion, and bonding each of the side wall portions and each flat portion and the folded side edge portion of the bottom wall portion to the flat portion with the flat portion. Forming a thermal bonding portion extending in the same direction on a side edge.

[0006]

In the manufacturing method according to the invention of the prior application, when the bottom wall is folded into a mountain shape, it is necessary to form a slant ridge in advance so as to form a fold. This requires extra labor in automating the manufacturing process. The present invention makes it possible to easily produce a bag-like container that can be folded into a bag shape without imparting a folding habit to a thin material sheet in advance, has a good shape retention property in an automated process, and has good self-standing stability. It is an object of the present invention to provide a manufacturing method which can be performed.

[0007]

According to the present invention, there is provided a bag-shaped container comprising a pair of flat portions constituting the front and rear surfaces, a pair of side wall portions which are folded inward and bonded between the flat portions, In a method of manufacturing a bag-like container in which a bottom portion covering one end of a flat portion and a side wall portion is formed of a multilayer laminate sheet, at least a pair of flat portions and a bottom wall portion located therebetween are formed as an integral part. A sheet is formed, and the bottom wall portion of the sheet is defined by a pair of straight valley fold lines that traverse transversely along a boundary between the pair of flat portions and the bottom wall portion, and the pair of valley fold lines. The bottom wall portion to be folded into a pantograph-like side shape with its horizontal center line and two straight horizontal mountain fold lines separating the pair of valley fold lines, and then a pair of vertically folded two Fold the side wall of the hill so that the mountain fold line side faces each other. A folded bottom wall and a pair of flat sides are placed or folded inward to form a bag-like material, and the inner surfaces of the edges except for the open end side of the bag-like material are thermally bonded to each other. This is a method for manufacturing a bag-like container in which a thermal bonding portion is formed at an edge. When the inner surfaces of the edges of the bag-like material are thermally bonded to each other, the edge on the bottom wall side is thermally bonded to the bottom of the ship, and the lower portion of the riser portion of the bottom of the ship is cut off at the outer side of the thermally bonded portion to form a leg. May be formed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a bag-like container made by the manufacturing method of the present invention. This shows a state in which heat bonding is performed, the contents are filled, and the contents are sealed with the cap 22. In FIG. 1, the bag-like container 1 is composed of a pair of flat portions 2 facing each other, a pair of side wall portions 3 positioned between them and folded inward toward the inside, and a bottom wall portion covering one end thereof. The pair of plane portions 2 and the side wall portions 3 are thermally bonded at bonding portions 5 and 5 ', respectively, and the bottom wall portions are thermally bonded at bonding portions 6, 7, and 7'. When the bag-like container 1 is viewed from the front, the bottom side is thermally bonded to the bottom of the ship, and a rising portion 7 that connects the bonding portion 5 and the bonding portion 6 in an oblique direction is formed. The part appears to be formed.

A sheet constituting the bag-like container 1 is a multilayer laminate sheet, an example of which is shown below. In order from the outer layer, a biaxially stretched polyester film having a thickness of 15 μm and a melting point of about 245 ° C., a silica-deposited polyester film having a thickness of 12 μm, a stretched nylon film having a thickness of 15 μm, and an innermost layer having a thickness of 80 μm and having a melting point of heat. Adhesion temperature 140
A multilayer film was obtained by laminating a polyethylene film having a temperature of about 125 ° C. lower than about 100 ° C. In order to improve the gas barrier property, a 10 μm thick aluminum foil may be used instead of the 12 μm thick silica-deposited polyester film of the center layer.

As described above, the innermost layer of the multilayer laminate sheet constituting the bag-shaped container 1 is made of a synthetic resin having a lower melting point than the outermost synthetic resin and lower than the heat sealing temperature. When performing thermal bonding, the surfaces of the innermost layers facing each other are thermally bonded, so that the thermal bonding portions 5 to 7 ′ can be formed at the edge of the bag-shaped container 1 at a time.

FIGS. 2 to 4 show steps of manufacturing the bag-like container shown in FIG. FIG. 2 is a front view of the band-shaped multilayer laminate sheet 11 in which the bottom wall portion 4 is integrally formed at the center of the pair of flat portions 2 and 2 ′, and shows a state where the front side is the innermost layer. First, assuming a plurality of straight parallel folding lines 12, 12 ', 13, 13' and 14 transversely crossing the bottom wall 4 of the belt-shaped sheet 11 at quarters and using a push plate. Then, the boundary between the plane portions 2 and 2 ′ and the bottom wall portion 4 is trough-folded at the valley fold lines 12 and 12 ′ shown by dashed lines, and the valley fold lines 12 and 12 ′ and the center line 14 of the bottom wall portion 4 are formed. Are folded along the mountain fold lines 13 and 13 ′ indicated by two-dot chain lines between them, and folded so that the side surface shape becomes a pantograph shape.

FIG. 3 shows a pair of side wall portions 3 and 3 ′ obtained by folding a vertically long inner surface of the sheet 11 folded in a pantograph shape into two vertically outwardly.
3A is a plan view, and FIG. 3B is a right side view. Next, FIG.
As shown in A, the pair of side walls 3 and 3 ′ are aligned with the side edges of the plane portion 2 ′ with the respective folds facing each other, and the lower edge thereof is placed on the center valley fold line 14 of the bottom wall 4. Place it so that it matches. Subsequently, the flat portion 2 is raised and valley-folded along the valley fold line 14 at the center of the bottom wall portion 4 to be folded in a bag shape as shown in FIG. 4B.

[0013] The edges of the folded bag-like material except for the opening are sandwiched from the outside using a thermal bonding device having a bottom shape at the bottom, and are thermally bonded. Since the band-shaped sheet 11 and the pair of side walls 3 and 3 ′ use a multilayer laminate sheet whose innermost layer has the lowest melting point, the flat portions 2 and 2 ′, the side walls 3 and 3 ′, and the bottom wall 4 are formed. The innermost layers overlapping each other are thermally bonded to each other, and as shown in FIG. 4C, the side thermal bonding portions 5, 5 'and the bottom thermal bonding portion 6 and the rising thermal bonding portions 7, 7' connecting the both are formed. Is done. At the same time, the lower part of the outer side of the rising thermal bonding portions 7, 7 'is cut off obliquely to form legs.

FIGS. 5 to 7 show a second embodiment. The multilayer laminate sheet used in this embodiment is, as shown in FIG. 5, on the side of the plane portion of the strip-shaped multilayer laminate sheet (see FIG. 2) used in the first embodiment described above, as shown in FIG. Since the multilayer laminate sheet 15 cut out into a shape in which the side wall portion is integrally formed is used, and the shape and folding method of the flat portion and the bottom portion are the same as those of the first embodiment described above, The same portions will be described with the same reference numerals in the drawings. The multilayer laminate sheet shown in FIG. 5 has a side wall 3 integrally formed on the side of the plane portion 2 and a side wall 3 'formed integrally on the side opposite to the plane portion 2', and is substantially Z-shaped. Sheet 15 of FIG.

The bottom wall 4 of the Z-shaped sheet 15 is
As in the first embodiment, the plane portions 2, 2 'and the bottom wall portion 4
Fold at the valley fold lines 12, 12 ′ indicated by dash-dot lines at the boundary between the valley fold lines 12, 12 ′ and the center line 1 of the bottom wall 4.
4 is folded at a mountain fold line 13 shown by a two-dot chain line, so that the side shape becomes a pantograph shape. FIG. 6A shows this state, FIG. 6A is a plan view, and FIG. 6B is a right side view.

Next, the mountain fold lines 18, 1 of the side walls 3, 3 'are formed.
Valley fold line 17, 1 at the boundary between 8 ′ and plane portions 2, 2 ′
At 7 ′, the side walls 3, 3 ′ are folded inward, respectively, and are folded over the plane parts 2, 2 ′ and the bottom wall 4. FIG. 7A shows this state, FIG. 7A is a plan view, FIG. 7B is a right side view, and FIG.
Is a bottom view. Subsequently, the one flat portion 2 and the side wall portion 3 are erected and valley-folded at the valley fold line 14 of the bottom wall portion 4, and folded in a bag-like manner as in the first embodiment (see FIG. 4B). . At the same time, the same as in the first embodiment (see FIG. 4C)
Then, the edges of the bag are thermally bonded at one time, and the lower portion of the outer side of the thermal bonding is cut off diagonally to form legs. In the second embodiment, since the flat portion, the bottom wall portion, and the side wall portion are folded into a bag shape using a substantially Z-shaped sheet in which the flat portion, the bottom wall portion, and the side wall portion are integrated.
As in the embodiment, there is no need to place the separately folded side wall portion in alignment with the side edge of the flat portion, and the bag-shaped material can be easily formed.

FIGS. 8 and 9 show a modification of the second embodiment. The multilayer laminate sheet to be used is replaced with a substantially Z-shaped sheet 15 and, as shown in FIG. 8, a substantially T-shaped sheet 19 in which the side wall 3 is moved to the right side of the plane portion 2 is used. Since the shape of the flat portion and the bottom portion, the method of folding and the method of heat bonding are the same as those of the second embodiment described above, the same portions are attached to the drawings showing the second embodiment. The same reference numerals as those in the first embodiment are used in FIGS. 8 and 9, and the detailed description is omitted.

In the embodiment described above, the bottom side of the bag-shaped container is heat-bonded to the bottom of the ship, and a rising portion 7 that connects the bonding portion 5 and the bonding portion 6 in an oblique direction is formed. )
However, as shown in FIG. 10, a bag-like container provided with the side thermal bonding portions 5 and the rectangular bottom thermal bonding portions 16 may be thermally bonded along the rectangular edges of the folded bag-like material.

[0019]

The present invention uses a multilayer laminate sheet having at least a pair of flat portions and a bottom wall portion which form a bag-like container and integrated with the bottom wall portion, and uses only a straight parallel folding line to form the bottom wall portion. Since the sheet is folded, it is not necessary to add a folding habit to the thin sheet in advance, and the automation of manufacturing can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a bag-like container made by the production method of the present invention.

FIG. 2 is a front view of a belt-shaped sheet used in the present invention.

FIG. 3 is an explanatory view showing how to fold a bottom wall portion of the belt-like sheet shown in FIG. 2;

FIG. 4 is an explanatory view showing a process of folding and heat bonding to a bag-like material.

FIG. 5 is a plan view showing a Z-shaped sheet used in a second embodiment.

FIG. 6 is an explanatory view showing how to fold the bottom wall of the Z-shaped sheet shown in FIG. 5;

FIG. 7 is an explanatory view showing a state where the side wall portion of FIG. 6 is folded.

FIG. 8 is a plan view showing a T-shaped sheet used in the second embodiment.

FIG. 9 is an explanatory view showing how to fold the bottom wall of the T-shaped sheet shown in FIG. 8;

FIG. 10 is a perspective view showing another embodiment of the bag-shaped container manufactured by the present invention.

[Explanation of symbols]

1: bag-like container 2, 2 ': flat portion 3, 3': side wall portion 4: bottom wall portion 5 to 7 ', 16: adhesive portion 11: band-shaped sheet 1
5: Z-shaped sheet 12, 12 ', 14, 17, 1
7 ': Valley fold line 13, 13', 18, 18 ': Mountain fold line 19: T-shaped sheet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiyasu Usuki 5-5-1 Nishihashimoto, Sagamihara City, Kanagawa Prefecture Inside Daiwa Seikan Co., Ltd. (72) Inventor Yoshio Noda 5-5 Nishihashimoto, Sagamihara City, Kanagawa Prefecture No. 1 F-term in the Technical Development Center of Daiwa Seikan Co., Ltd. (Reference) 3E064 AA13 AB23 BA17 BA26 BA36 BA54 BB03 BC08 BC18 EA04 FA04 GA01 HM01 HN65 3E075 AA03 BA47 BA70 BB22 CA01 DD13 DD44 DD49 GA04

Claims (3)

[Claims] 1. A pair of flat portions constituting a front surface and a rear surface of a bag-like container, a pair of side wall portions which are folded inward and bonded between the flat portions, and one end of the flat portion and the side wall portion. Forming a pair of flat portions and a bottom wall portion located in the middle of the flat portions in an integrated band-shaped sheet, in the method for manufacturing a bag-like container formed of a multilayer laminate sheet; A pair of straight valley fold lines that traverse the bottom wall of the band-shaped sheet in a lateral direction along a boundary between the pair of flat portions and the bottom wall, and a bottom wall defined by the pair of valley fold lines Folding the part into a pantograph-like side shape with two horizontal straight mountain fold lines dividing the horizontal center line thereof and the pair of valley fold lines, and forming a pair of side wall portions folded vertically into two. With the central part of the folded bottom wall facing the mountain fold line side And a step of thermally bonding the inner surfaces of the edges except for the opening end side of the bag-like material to form a thermally bonded portion at the edges. A method for producing a bag-shaped container, comprising: 2. A pair of flat portions constituting a front surface and a rear surface of a bag-shaped container, a pair of side wall portions that are folded inward and bonded between the flat portions, and one end of the flat portion and the side wall portion. A method of manufacturing a bag-like container in which a bottom wall portion is formed of a multilayer laminate sheet, comprising: a pair of flat portions; a bottom wall portion located between the flat portions; Forming a side wall portion and an integral sheet; forming a bottom wall portion of the sheet into a pair of straight valley fold lines transversely crossing a boundary between the pair of flat portions and the bottom wall portion; Folding the bottom wall section defined by the valley fold line into a pantograph-like side shape at a lateral center line thereof and two straight horizontal fold lines dividing the pair of valley fold lines; A pair of side walls are vertically folded in two at a mountain fold line and a valley fold line at the boundary between the plane portions. A step of folding over the central portion of the bottom wall portion and the side portion of one of the flat portions, which are folded in the pantograph shape with the mountain fold lines facing each other, and a valley fold line at the center of the bottom wall portion. Folding along the bag to form a bag, and heat bonding the inner surfaces of the edges except for the opening end side of the bag to form a heat bonded portion at the edge. A method for producing a bag-like container, characterized by comprising: 3. When the inner surfaces of the edges of the bag-like material are thermally bonded to each other, the edge on the bottom wall side is thermally bonded to the bottom of the ship, and the lower portion outside the thermal bonding portion of the rising portion of the bottom of the ship is formed. The method for producing a bag-shaped container provided with a double-bottomed bottom according to claim 1 or 2, wherein the container is cut off.