JP2001315224A - Method and apparatus for producing bag-shaped container with bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a bag-shaped container with a bottom which can insert a bottom member into the lower end opening part of a barrel member and beautifully heat-seal the lower end part of the barrel member and the bottom member together and an apparatus for the method. SOLUTION: In the method in which after the bottom member 20 is inserted into the lower end opening part of the barrel member 10, the peripheral wall 22 of the bottom member 20 is heat-sealed over its whole circumference to the lower end part of the barrel member 10, when the bottom member 20 is inserted into the lower end opening part of the barrel member 10, by sucking the outer surface of the barrel member 10 widely by a shaping member 31, the barrel member 10 is shaped in a similar shape when contents are packed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a body member formed of a flexible sheet and having a lower end opening, and a bottom member having an annular peripheral wall hanging down from a peripheral edge of a bottom plate,
The present invention relates to a method and an apparatus for manufacturing a bottomed bag-shaped container in which a peripheral wall of a bottom member is heat-sealed to a lower end portion of the trunk member over the entire periphery thereof in a state in which the bottom member is fitted into a lower end opening of the trunk member.

[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. 5 (a) and 5 (b), this bag-like container with a bottom has a pair of gusset portions 51a formed by folding both sides of a flexible sheet formed into a cylindrical shape inside. The body member 51 has a bag-shaped body member 51 whose upper end opening including the gusset portion 51a is heat-sealed to each other, and a bottom member 52 for closing the lower end opening of the body member 51.

The bottom member 52 has a disc-shaped bottom plate 52a.
And an annular peripheral wall 52 hanging down from the peripheral edge of the bottom plate 52a.
b in a state where the bottom member 52 is fitted in the lower end opening of the body member 51, and the peripheral wall 52b of the bottom member 52
Is heat-sealed to the lower end of the body member 51 over the entire circumference.

In order to manufacture such a bottomed bag-shaped container 50, first, a body member 51 and a bottom member 52 are manufactured in different steps. Then, FIG. 6 (a),
As shown in (b), the lower end opening of the body member 51 is widened by suction using a suction device provided with a suction pad 61, and as shown in FIG. The member 52 is fitted into the lower end opening of the body member 51,
When the outer peripheral surface of the lower end of the body member 51 is heat-sealed by the seal bar 81, the bottom member 52 is attached to the body member 51, and the bottomed bag-shaped container 50 in which the lower end opening of the body member 51 is closed by the bottom member 52 is completed. .

[0005]

However, as described above, when the opening at the lower end of the body member 51 is to be widened by partially sucking it with the suction device, FIG.
Since only the lower end portion of the body member 51 is extremely widened, as shown in FIG.
, And the opening at the lower end of the body member 51 cannot be completely expanded in a completely circular shape.
In order to smoothly fit into the lower end opening of the trunk member 51,
The lower end opening of the body member 51 needs to be set to be somewhat larger than the bottom member 52. Therefore, when the bottom member 52 is fitted into the lower end opening of the body member 51 and heat-sealed by such a method, wrinkles and the like are generated at the lower end of the body member 51 and the lower end of the body member 51 and the bottom member 52 are formed. There is a problem that it is not possible to heat seal the peripheral wall 52b neatly. In particular, when the body member 51 is formed of a thin synthetic resin sheet having no stiffness, wrinkles and the like are significantly generated in the body member 51.

SUMMARY OF THE INVENTION It is an object of the present invention to smoothly fit a bottom member into a lower end opening of a body member.
An object of the present invention is to provide a method and an apparatus for manufacturing a bag-like container with a bottom capable of heat-sealing a lower end portion of a body member and a bottom member neatly.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a body member having a lower end opening formed by a flexible sheet, and an annular peripheral wall hanging down from a peripheral edge of a bottom plate. A bottom member which is heat-sealed to the lower end of the body member over the entire periphery thereof in a state where the bottom member is fitted into the lower end opening of the body member. A method for manufacturing a bag-like container, wherein when the bottom member is fitted into the lower end opening of the body member, the outer surface of the body member is suctioned over a wide area, and the same as when the contents are filled. A method for producing a bottomed bag-like container, characterized in that the body member is shaped into a shape.

The method for manufacturing the bag-like container with a bottom configured as described above includes a body member having a lower end opening formed by a flexible sheet, and a bottom portion having an annular peripheral wall hanging down from a peripheral edge of the bottom plate. A bottom-shaped bag-like container having a bottom member covered with the lower end opening of the body member and heat-sealing the peripheral wall of the bottom member to the lower end of the body member over the entire periphery thereof. An apparatus, wherein the bottom member is held from the inner surface side of a peripheral wall thereof, and a fitting means is fitted into a lower end opening of the body member; and the bottom member held by the fitting means is the body. Welding means for heat-sealing the peripheral wall of the bottom member to the lower end of the body member over the entire periphery thereof in a state fitted in the lower end opening of the member, and a lower end opening of the body member by the fitting insertion means; Fit the bottom member And a shaping means for shaping the body member into a shape similar to that when the contents are filled by suctioning the outer surface of the body member over a wide area. It can be carried out by a bag-shaped container manufacturing apparatus.

In the method and apparatus for manufacturing a bag-like container with a bottom configured as described above, when the bottom member is fitted into the opening at the lower end of the body member, the outer surface of the body member is suctioned over a wide range. Since the body member is shaped into the same shape as when the contents are filled, the lower end opening of the body member has substantially the same shape as the bottom member, and the lower end opening of the body member is somewhat larger than the bottom member. The bottom member can be smoothly fitted into the lower end opening of the trunk member without being set large. Therefore, unlike the conventional manufacturing method in which the lower end opening of the body member must be set to be somewhat larger than the bottom member, wrinkles and the like do not occur at the lower end of the body member. The lower end of the member and the peripheral wall of the bottom member can be cleanly heat-sealed.

Further, in this manufacturing method and the manufacturing apparatus, the body member and the bottom member are heat-sealed in advance in substantially the same state as when the contents are filled. It is possible to manufacture a bottomed bag-like container that has the most beautiful and stable shape when the contents are filled without distortion occurring in the heat-sealed portion between the member and the bottom member.

[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 heat-sealed to the body member 10. And a bottom member 20 for closing a lower end opening of the body member 10.
The bottom member 20 and the bottom member 20 are both 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, 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 inclined edge 11 and an upper edge 12 thereof. Are sealed by heat-sealing each other, and the upper edge 12 is heat-sealed to each other with a spout 13 serving as a spout that can be opened and closed by a screw cap 13a. In FIG. 3A, a region indicated by oblique lines is a heat sealing region.

The bottom member 20 is formed by pressure-forming a synthetic resin sheet having flexibility.
As shown in (b) and (c), it is composed of a disc-shaped bottom plate 21 and an annular peripheral wall 22 hanging downward from the periphery of the bottom plate 21.

As a synthetic resin sheet used for molding the bottom member 20, a heat-fusible resin layer which is fused to the inner surface of the synthetic resin sheet forming the body member 10 is provided on the outer peripheral surface side of the peripheral wall 22. Laminated sheet with, for example, an unstretched polypropylene, an unstretched polyester or an unstretched outer resin film formed of a stretchable synthetic resin film such as a heat-fusible resin layer made of a linear low-density polyethylene or the like. Laminated thickness 200-500
A laminated sheet having a thickness of about μm is used.

The bag-like container 1 with a bottom shown in FIGS. 1A and 1B is a body member 1 previously formed by another process.
It is manufactured as follows using the zero and the bottom member 20. First, as shown in FIGS. 3A and 3B, the lower half of the flat trunk member 10 is sandwiched between a pair of shaping members 31.

This shaping member 31 is shown in FIGS.
As shown in FIG. 1, an outer peripheral surface 31a having an arc shape and a body member 1 in a state where contents are filled in a bag-like container 1 with a bottom shown in FIG.
A hollow member having an inner peripheral surface 31b curved along the outer peripheral surface of the inner peripheral surface 31b.
1c are formed at regular intervals in the vertical and horizontal directions, and a tapping 31d for connecting to a suction device (not shown) via a tube is formed on the outer peripheral surface 31a.

Next, in a state where the lower half of the body member 10 is sandwiched between the pair of shaping members 31, the suction device is operated to suck air from the suction holes 31c formed in the inner peripheral surface 31b. As shown in (b), the flat body member 10 is drawn toward the inner peripheral surface 31b of the shaping member 31, and
The lower end opening of the body member 10 starts to spread.

As shown in FIG. 4A, when the lower end opening of the body member 10 starts to expand, the insertion member 32 in which the bottom member 20 is fitted rises from the lower side of the body member 10. As a result, the bottom member 20 approaches the lower end opening of the trunk member 10 and, at the same time, air is supplied from the spout 13 of the trunk member 10 by an air supply device (not shown), whereby the trunk member 10 is pushed outward from the inside to the outside. , Shaping member 31
Is completely adsorbed on the inner peripheral surface 31b. At this time, since the lower end opening of the body member 10 is substantially closed by the bottom member 20, the air supplied to the body member 10 is hardly discharged to the outside from the lower end opening, and the body member 10 is The supplied air ensures the inner peripheral surface 31 of the shaping member 31.
It will be pushed to the b side.

As described above, the lower half portion of the body member 10 is attracted to the inner peripheral surface 32 of the shaping member 30, so that the body member 10 is shaped into a shape substantially similar to that when the contents are filled. Since the lower end opening is opened in a substantially perfect circular shape, the bottom member 20 is fitted into the lower end opening of the body member 10 by further raising the insertion member 32.

In this manner, the bottom member 20 is
When the fitting member 31 is fitted into the lower end opening of the bottom member 20, the shaping member 31 is retracted, and the lower end of the body member 10 is pressed by the seal bar 33 from the outer surface side as shown in FIG. The peripheral wall 22 and the lower end of the body member 10 are heat-sealed over the entire circumference, and the bag-like container 1 with a bottom as shown in FIG. 1 is completed.

In this method of manufacturing a bag-like container with a bottom,
As described above, when the bottom member 20 is fitted into the lower end opening of the trunk member 10, the shaping member 31 shapes the trunk member 10 into substantially the same shape as when the contents are filled, thereby forming the trunk. Since the lower end opening of the member 10 is expanded in a substantially circular shape similar to the outer diameter shape of the bottom member 20, the inner diameter of the lower end opening of the body member 10 is set to be slightly larger than the outer diameter of the bottom member 20. Even with this degree, the bottom member 20 can be smoothly and securely fitted into the lower end opening of the body member 10.

Therefore, when this manufacturing method is adopted, the inner diameter of the lower end opening of the body member 10 does not need to be set to be somewhat larger than the outer diameter of the bottom member 20.
The lower end of the body member 10 and the peripheral wall 22 of the bottom member 20 can be heat-sealed neatly without wrinkles or the like at the lower end of the zero. In particular, when the body member 10 is formed of a thin synthetic resin sheet having no stiffness, there is an effect that heat sealing can be performed neatly.

Also, since the body member 10 and the bottom member 20 are heat-sealed in advance in the same state as when the contents are filled, the body member 10 and the bottom member 20 are not sealed when the contents are filled. Thus, it is possible to produce a bag-like container with a bottom that has the most beautiful shape when the contents are filled without distortion occurring in the heat-sealed portion.

Further, in this manufacturing method, when the body member 10 is shaped by the shaping member 31, air is supplied from the spout 13 to the inside of the body member 10, so that the body member 10 is also expanded from the inside thereof. As a result, the outer peripheral surface of the body member 10 is fixed to the inner peripheral surface 31b of the shaping member 31.
There is an effect that it is possible to uniformly and surely adsorb.

In this embodiment, as described above, air is supplied to the inside of the body member 10 to assist the shaping member 31 in shaping the body member 10. However, the present invention is not limited to this. Instead, for example, a plurality of suction pads are incorporated in the shaping member 31, and first, in a state where the body member 10 is spread to some extent by the suction pad, a suction hole 31 c formed in the inner peripheral surface 31 b of the shaping member 31. The body member 10 is attracted to the inner peripheral surface 31b of the shaping member 31 by sucking air from the body member, or after the flat body member 10 is sandwiched by the pair of shaping members 31, the body member 10 is inserted into the body member 10 from the lower end opening. In a state where the body member 10 is spread to some extent by inserting a child or the like, air is sucked from suction holes 31c formed in the inner peripheral surface 31b of the shaping member 31 so that the body is It is also possible to adsorb the timber 10 on the inner peripheral surface 31b of the shaping member 31.

In the above-described embodiment, the body member 10
Although the lower half of the body member 10 is sandwiched by the shaping member 31, the present invention is not limited to this. It is also possible to use a shaping member that sandwiches the entire body member 10, and form the body member 10. The suction area of the shaping member may be appropriately set in consideration of the thickness of the flexible sheet, the strength of the waist, and the like.

Further, the shaping member 31 is formed so as to be divided into a portion covering the region excluding the lower end portion of the body member 10 and a portion covering the lower end portion of the body member 10, and suction is performed using the shaping member 31. With the trunk member 10 expanded by the
After fitting 0, only the lower end of the shaping member 31 may be retracted, and the lower end of the body member 10 may be heat-sealed to the bottom member 20.

In the above-described embodiment, the production of the bag-like container 1 with a spout and a bottom is described.
The present invention is not limited to the production of a bottomed bag-like container with a spout, and can be applied to various types of bottomed bag-like containers, such as those that open and close the upper part of a trunk member by a chuck, A gusset portion may be formed on the body member.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a bag-like container with a bottom manufactured by the manufacturing method according to the present invention, FIG. 1B 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 with a bottom.

2 (a) and 2 (b) are perspective views showing a pair of shaping members used in the manufacturing method of the above, and FIG. 2 (c) is a side view showing the shaping members of the same.

FIGS. 3 (a) and 3 (b) are process diagrams showing steps for manufacturing a bag-like container with a bottom according to the first embodiment.

FIGS. 4 (a) and 4 (b) are process diagrams showing steps for producing a bag-like container with a bottom according to the first embodiment.

5A is a cross-sectional view illustrating an example of a bag-like container with a bottom, and FIG. 5B is a perspective view illustrating the bag-like container with a bottom according to the embodiment.

FIGS. 6 (a) to 6 (c) are process diagrams showing a manufacturing process of the above bag-like container with a bottom.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bag-like container with bottom 10 trunk member 13 spout 20 bottom member 21 bottom plate 22 peripheral wall 31 shaping member 31a outer peripheral surface 31b inner peripheral surface 31c suction hole 31d tapping 32 fitting member 33 seal bar

Claims (2)

[Claims] 1. A body member having a lower end opening formed by a flexible sheet, and a bottom member having an annular peripheral wall hanging down from a peripheral edge of a bottom plate, wherein the bottom member is connected to a lower end opening of the body member. A method of manufacturing a bag-like container with a bottom in which the peripheral wall of the bottom member is heat-sealed to the lower end of the body member over the entire circumference thereof in a state where the bottom member is fitted into the bottom member. A bag with a bottom, characterized in that when the bottom member is fitted, the body member is shaped into the same shape as when the contents are filled by sucking the outer surface of the body member over a wide area. Method for manufacturing a container. 2. A body member having a lower end opening formed by a flexible sheet, and a bottom member having an annular peripheral wall hanging down from a peripheral edge of the bottom plate, wherein the bottom member is connected to a lower end opening of the body member. A device for manufacturing a bag-like container with a bottom in which the peripheral wall of the bottom member is heat-sealed to the lower end portion of the body member over the entire periphery thereof in a state where the bottom member is fitted into the bottom member. While holding from the side,
Fitting means for fitting into the lower end opening of the body member, In a state where the bottom member held by the fitting means is fitted into the lower end opening of the body member, the peripheral wall of the bottom member, Welding means for heat-sealing the lower end of the trunk member over the entire circumference; and when the bottom member is fitted into the lower end opening of the trunk member by the fitting means, the outer surface of the trunk member is widely sucked. And a shaping means for shaping the body member into the same shape as when the contents are filled.