JP2001080650A - Bag-shaped container with bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag-shaped container with a bottom, excellent in self-supporting stability and easy to be folded in a flat state. SOLUTION: A bag-shaped container with a bottom comprises a bag-shaped body member 10 having a lower end opening and a bottom member 20 for closing the lower end opening of the body member 10 by being thermowelded to the body member 10, and both the body member 10 and the bottom member 20 are formed of a synthetic resin sheet having flexibility. A spout 13 having an openable screw cap 13a is mounted on an upper edge of the body member 10. The bottom member 20 comprises a disc-shaped bottom plate 21 whose central portion is swollen downward and an annular circumferential wall 22 suspended from a circumferential edge of the bottom plate 21 and thermowelded to the body member 10. The bottom plate 21 is so designed that it can be held in an upwardly swollen state by pushing up its central portion and inverting it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-like container with a bottom, comprising a bag-shaped body member formed of a flexible sheet, and a bottom member for closing a lower end opening of the body member.
In particular, the present invention relates to a bottomed bag-like container having excellent self-standing stability.

[0002]

2. Description of the Related Art As a container for accommodating food and drink such as a liquid beverage and a liquid food, there is, for example, a bag-like container with a bottom disclosed in Japanese Patent Application Laid-Open No. 11-171203. As shown in FIGS. 8A and 8B, the bottomed bag-shaped container has a pair of gusset portions 51a formed by folding both sides of a flexible sheet formed in a cylindrical shape inward. Further, a bag-shaped body member 51 having an upper end opening including the gusset portion 51a is heat-welded to each other, and a bottom member 52 for closing the lower end opening of the body member 51.

The bottom member 52 comprises a flat disk-shaped bottom plate 52a and an annular peripheral wall 52b hanging down from the periphery of the bottom plate 52a. The bottom member 52 covers the lower end opening of the body member 51. The peripheral wall 5 of the bottom member 52
2b is heat-welded to the lower end of the body member 51 over the entire circumference.

[0004]

In the bag-like container 50 with a bottom as described above, the flat bottom plate 52a for receiving the contents is provided at a position higher than the lower end of the body member 51. When the display or the like is performed in a state where the bag-like container 50 with the bottom filled with an object is raised, there is a problem that the center of gravity of the entire container becomes high and sufficient self-standing stability cannot be secured.

[0005] In addition, such a bag-like container 50 with a bottom.
In the stage before filling the contents, it is desirable to transport and store the bag-shaped body member 51 in a flat folded state, but a flat bottom plate 52a is continuously provided on the upper end edge of the annular peripheral wall 52b. Bottom member 5 having a certain degree of shape retention
2 is attached to the lower end of the bag-shaped body member 51, so that it is difficult to fold the entire container in a flat state, and there is a problem that handling properties during transportation and storage are poor.

An object of the present invention is to provide a bag-like container with a bottom which has excellent self-standing stability and is easily folded in a flat state.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a bag-shaped body member formed of a flexible sheet, and a bottom member for closing a lower end opening of the body member. The bottom member is a molded body having a bottom plate whose central portion bulges downward, and an annular peripheral wall hanging down from a peripheral edge of the bottom plate, and the bottom member has a lower end opening of the trunk member. And a bottomed bag-like container in which the peripheral wall of the bottom member is thermally welded to the lower end of the body member over the entire periphery thereof.

The bag-like container with a bottom configured as described above has a flat bottom plate when the contents are filled because the center of the bottom plate constituting the bottom member swells downward. Compared with the conventional bottomed bag-shaped container, the center of gravity is lowered, and the self-standing stability is improved.

In a bag-like container with a bottom according to the second aspect, wherein the bottom plate is formed so as to be swellable upward, transport and storage before filling the contents. Occasionally, the bottom member is easily folded in two by expanding the bottom plate upward, so that the entire container can be easily folded in a flat state compared to a conventional bottomed bag-shaped container having a flat bottom plate. There is.

[0010] In particular, when a bent groove extending in the radial direction is formed in the bottom plate as in the bag-like container with a bottom according to the third aspect, the bottom member further extends along the bent groove. This has the effect of making it easier to fold and making it easier to fold the entire container into a flat state.

[0011]

Embodiments will be described below with reference to the drawings. As shown in FIGS. 1 (a), 1 (b) and 1 (c), the bag-like container 1 with a bottom has a bag-shaped body member 10 having a lower end opening, and is thermally welded to the body member 10. And a bottom member 20 for closing a lower end opening of the body member 10, and both the body member 10 and the bottom member 20 are formed of a synthetic resin sheet having flexibility.

The synthetic resin sheet forming the body member 10 is a laminate sheet having a heat-fusible resin layer on the inner surface side, for example, a synthetic resin such as biaxially stretched polyamide, biaxially stretched polyester or biaxially stretched polypropylene. A laminated sheet having a thickness of about 100 to 150 μm or the like in which a heat-fusible resin layer made of linear low-density polyethylene, polypropylene, or the like is laminated on an outer layer film formed of the film is used. In addition, it is also possible to laminate a gas barrier layer inside the outer layer film.

As shown in FIGS. 1A and 1B, the body member 10 is formed by forming the synthetic resin sheet punched into a predetermined shape into a cylindrical shape, and then forming an upper side edge 11 and an upper edge 1 thereof.
The upper edge 12 is heat-welded to each other with the spout 13 serving as a spout that can be opened and closed by a screw cap 13a sandwiched therebetween. I have. In FIG. 3A, a region indicated by oblique lines is a heat welding region.

As a method of forming the synthetic resin sheet into a cylindrical shape in the process of manufacturing the body member 10, the edges of one synthetic resin sheet are butted against each other, and the butted portion is heated from the inner surface side. Pasting the adhesive tape,
Edges of synthetic resin sheets having the same type of heat-fusible resin layer on both sides are overlapped with each other, and the overlapped portion is heat-welded or two sheets having a heat-fusible resin layer on the inner surface side Various methods, such as laminating resin sheets and heat-welding the side edges thereof, can be employed, and a seamless tube can also be used.

The bottom member 20 is formed by pressure-forming a synthetic resin sheet having flexibility.
As shown in (b) and (c), the bottom plate 21 includes a disk-shaped bottom plate 21 whose central portion bulges downward, and an annular peripheral wall 22 that hangs downward from the periphery of the bottom plate 21. 2
1 pushes up the central part and inverts it,
As shown in FIG. 2A, it can be held in a state of being bulged upward.

As shown in FIG. 2B, the bottom surface of the bottom plate 21 is set so that the lowermost surface of the bottom plate 21 substantially coincides with the lower end of the peripheral wall 22 in a state in which the central portion is swelled downward. When the bag-like container with bottom 1 filled with the contents is erected, the outer peripheral portion of the body member 10 is
1, the central part of the body member 10 is supported.

The synthetic resin sheet used for molding the bottom member 20 includes a body member 10 on the outer peripheral surface side of the peripheral wall 22.
Single-layer or multi-layer flexible sheet with a heat-fusible resin layer that fuses to the inner surface of the synthetic resin sheet that forms the elongation of unstretched polypropylene, amorphous polyester or unstretched polyamide, etc. Thickness 200 in which a heat-fusible resin layer made of linear low-density polyethylene or the like is laminated on an outer layer film formed of an easy synthetic resin film.
A thick laminated sheet of about 500 μm or the like is used.

The bag-like container 1 with a bottom shown in FIGS. 1A and 1B is prepared in advance by a separate process.
After the bottom member 20 is covered with the lower end opening of the body member 10, the peripheral wall 22 of the bottom member 20 is pushed radially outward to spread the outer peripheral surface of the peripheral wall 22 on the inner peripheral surface of the body member 10. The lower end of the body member 10 and the peripheral wall 2 of the bottom member 20 are kept in close contact with each other.
2 by heat welding. In addition, the diameter expansion work of the bottom member 20 is performed as shown in FIGS.
After fitting the bottom member 20 to the expanding claw C, FIG.
As shown in FIG. 3 (d), the opening is performed by opening the expanding claw C. Therefore, in order to prevent such an operation of expanding the diameter of the bottom member 20 during the manufacturing of the container, as shown in FIG. It is desirable that the bottom plate 21 of the bottom member 20 has its central portion bulged upward.

When the bag-like container 1 with a bottom is manufactured by the above method, the inner diameter of the lower end opening of the body member 10 is adjusted so that the lower end opening of the body member 10 can be smoothly covered on the bottom member 20. Even if it is set to be somewhat larger than the outer diameter of the material 20, there is almost no difference in the circumferential length between the lower end opening of the body member 10 and the peripheral wall 22 of the bottom member 20 during heat welding. Thus, a beautiful welded state can be achieved without wrinkles occurring on the body member 10 side.

As shown in FIG. 2A, the bottomed bag-like container 1 manufactured as described above has a bottom plate 21 of a bottom member 20 bulging upward. 4
As shown in FIG. 4A, the bottom member 20 in which the center of the bottom plate 21 swells upward is shown in FIGS. 4B and 4C.
It can be easily folded in two. Therefore, as shown in FIGS. 5A and 5B, the manufactured bag-like container 1 with a bottom can be folded in a flat state so that the lower portion thereof is along the upper side edge 11 and the upper edge 12. This makes it possible to improve the handling of the bottomed bag-shaped container 1 during transportation and storage.

When filling the contents, FIG.
As shown in (b), due to the filling pressure and the weight of the filled contents, the central portion of the bottom plate 21 is pushed down and swells downward. As a result, the center of gravity of the entire container filled with the contents is lowered, and the container is supported by the central portion of the bottom plate 21 which swells downward. Stability is improved.

Further, in the above-described embodiment, the bottom member 21 which is swellable in the vertical direction employs the bottom member 20 which is continuously provided at the upper end of the annular peripheral wall 22, but FIGS. 6 (a) and 6 (b). As shown in FIG. 3), if a bent groove 21a for dividing the bottom plate 21 is formed along the upper side edge 11 and the upper edge 12 of the body member 10, the bottom member 20 is formed by the presence of the bent groove 21a. Further, there is an effect that the sheet is easily folded in two.

The bent groove formed in the bottom plate 21 is shown in FIG.
However, the present invention is not limited to a single groove as shown in FIG. 7, and for example, as shown in FIG. 7, a bent groove 21b formed of two or more parallel grooves may be employed. .

In the above embodiment, the spout 1
Although the production of the bag-like container 1 with a bottom having 3 has been described, the bag-like container with a bottom of the present invention is not limited to a spout, and various types such as a container whose upper part is opened and closed by a chuck. The present invention can be applied to a bag-like container with a bottom, and the body member 10 may be formed with a gusset portion.

In the above-described embodiment, the bottom member 20 is formed by pressure-forming a synthetic resin sheet. However, the bottom member 2 is formed by injection molding of a synthetic resin or another molding method.
It is also possible to form 0. However, it is preferable that the bottom member 20 obtained by forming the above-described multilayer laminate sheet by a sheet forming method such as pressure forming has appropriate flexibility and strength.

Further, in the above-described embodiment, the bottom member 20 is employed such that the lowermost surface of the bottom plate 21 bulging downward substantially coincides with the lower end of the peripheral wall 22. The container also supports the container in an upright state, but the invention is not limited to this, and any container having a bottom plate whose central portion swells downward when the contents are filled is provided. I just need.

[Brief description of the drawings]

1 (a) is a perspective view showing an embodiment of a bag-like container with a bottom according to the present invention, FIG. 1 (b) is a side view showing the bag-like container with a bottom, and FIG. It is an exploded sectional view showing a bag-like container.

FIG. 2 is a cross-sectional view showing a state where the bottom plate of the bottom member in the bag-like container with a bottom is pushed up, and FIG. 2 (b) is a cross-sectional view showing a state where the bottom plate is pushed down.

3A and 3B are a cross-sectional view and a plan view showing a state before the diameter expansion of the bottom member, and FIGS. 3C and 3D are a cross-sectional view and a plane view showing the state after the diameter expansion of the bottom member. FIG.

FIG. 4 (a) is a side view showing a bottom member of the above, (b),
(C) is a side view which shows the state which bent the bottom member same as the above.

FIG. 5 (a) is a front view showing a state where the bag-like container with a bottom is folded flat, and FIG. 5 (b) is a side view showing a state where the bag-like container with a bottom is folded flat.

FIG. 6A is a plan view showing another embodiment of a bottom member,
(B) is a sectional view taken along line XX of (a).

FIG. 7 is a plan view showing another embodiment of the bottom member.

8A is a cross-sectional view showing an example of a conventional bag-like container with a bottom, and FIG. 8B is a perspective view showing the bag-like container with a bottom in the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag-like container with a bottom 10 Body member 13 Spout 13a Screw cap 20 Bottom member 21 Bottom plate 21a, 21b Bending groove 22 Peripheral wall

Claims (3)

[Claims] 1. A bag-shaped body member formed of a flexible sheet, and a bottom member for closing a lower end opening of the body member, wherein the bottom member has a central portion bulging downward. And a ring-shaped peripheral wall hanging down from a peripheral edge of the bottom plate, wherein the bottom member is covered with a lower end opening of the trunk member,
A bag-like container with a bottom, wherein the peripheral wall of the bottom member is heat-welded to the lower end of the body member over the entire circumference. 2. The bag-like container with a bottom according to claim 1, wherein the bottom member is formed so that the bottom plate can swell upward. 3. The bag-like container with a bottom according to claim 2, wherein the bottom member has a bent groove extending in a radial direction in the bottom plate.