JP3046954B2 - Manufacturing method of bag container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bag container for storing a liquid such as a liquid food or a seasoning, a liquid detergent or the like, and a granular material such as powdered soap (hereinafter referred to as a container). About.

[0002]

2. Description of the Related Art Conventionally, refillable and disposable types are widely used as bag containers for storing the above-mentioned contents. A bag container of this type is usually formed by stacking flexible sheets and heat-sealing the end regions thereof, and a spout for taking out the contents is provided in the upper region. ing. A score line is formed in the spout, and the spout is opened by tearing the score line by hand to take out the contents.

[0003] By the way, when the contents are poured out, it is preferable that the spout is always open during the pouring process. Otherwise, air will not sufficiently flow into the bag container, and pouring will not be performed smoothly.

[0004] In a bag container formed by stacking flexible sheets as described above, a score line is simply formed in the spout portion, and the score line is torn to open the spout, so that the spout is smoothly performed. Can not be done. This is because the opposing inner surfaces at the spout after tearing are
This is because they adhere due to a decrease in internal pressure that occurs with the outflow of the contents. For this reason, in order to prevent close contact of the spout portion, the spout portion is processed so that the cross-sectional shape of the spout after being cut at the score line becomes substantially circular or elliptical.

However, even if the cross-sectional shape of the spout is substantially circular or elliptical, the opposing inner surfaces of such a spout come into close contact in the process of taking out the contents. This is because the cross section of the spout is symmetrical,
This is because the opposing surfaces easily adhere to each other. In addition, a bag container in which a pipe-shaped member is attached to the spout portion and the shape of the opening is maintained has been proposed, but the manufacturing process becomes complicated and the cost increases. I will.

It is also known that the bag container having the above-described spout is manufactured by air pressure molding as disclosed in Japanese Patent Application Laid-Open No. 9-207950. Then, the following problem arises.

Usually, bag containers used for the above-mentioned applications are composed of a composite material comprising a polyolefin layer (sealant layer) such as polyethylene and polypropylene and a barrier layer such as aluminum, PET, nylon, and eval (EVOH). However, when air pressure molding is performed with such a commonly used composite material, cracks and wrinkles are generated due to the difference in the appropriate air pressure molding temperature between the material of the sealant layer and the material of the barrier layer. Difficult to shape
Further, the thickness of the sheet is locally reduced, and the thickness is not uniform. In addition, a time period for keeping the composite material under air pressure relative to the heating mold and a cooling time period are required, which increases the molding time as a whole and increases the manufacturing cost.

The present invention has been made in view of the above-mentioned problems, and is intended to provide a bag container having a spout capable of smoothly pouring out contents in a short time, at low cost, and
It is an object of the present invention to provide a method for producing a bulged portion having a uniform shape and a thickness almost equal to that of a main body sheet.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method of stacking sheets made of a composite material having a sealant layer and a barrier layer and fusing them so as to form an accommodating portion for accommodating contents. When manufacturing a bag container having a spout for discharging the contents, the spout portion is formed between the stacked sheets, and a mandrel at a normal temperature in a predetermined shape defining a cross-sectional shape of the spout. After intervening, at normal temperature
It is characterized by being formed by heating and fusing from a flat sheet side with a concave mold and a heated flat mold .

[0010]

[0011]

The spout is formed by interposing a mandrel of a predetermined shape for defining a cross-sectional shape of the spout between the stacked sheets.
Created by heating and fusing from one sheet side,
Since the mold on the side where the mandrel and the bulging portion are formed is not heated and does not have a cooling step, it is almost the same as a normal heat sealing bag making step, and the processing step is shortened. Therefore, the influence of the difference in the appropriate shaping properties due to the difference in the melting point (suitable processing temperature) of the composite material constituting the sheet is reduced, and the occurrence of cracks and wrinkles in the spout portion is suppressed and the shaping is performed in a short time. Bag making becomes possible.

[0013]

1 is a view showing a first embodiment of a bag container according to the present invention, wherein FIG. 1 (a) is a view showing the overall shape, and FIG. 1 (b) is a view showing A in FIG. It is sectional drawing which followed the -A line.

The bag container 1 includes a polyolefin layer of polyethylene, polypropylene or the like (a layer to be heat-sealed and defined as a “sealant layer”), aluminum, PET,
Composite materials 1a and 1b composed of barrier layers such as nylon and EVAL (materials used differ depending on the application) are overlapped so that the sealant layers are opposed to each other, and the parts indicated by oblique lines are heat-sealed. Is done. In practice,
The upper region indicated by the reference numeral 1c is opened, and after the container is accommodated in the internal space 2 from this portion, the opening 1c is heat-sealed to complete the bag container accommodating the container. In addition,
The bag container may have a shape obtained by simply stacking two sheets, or as shown in the figure, a V-shaped sheet 1
A self-solid shape may be formed by interposing d, and the overall shape is not limited.

When a bag container is manufactured, a spout 10 is formed at an upper portion thereof by a method described later. There may be a score line 11 in the spout portion, and the spout 10 is opened by tearing this portion.

The spout 10 is formed such that its cross-sectional shape is asymmetrical on the front and back of the bag (the symmetrical shape here means a circular cross-section and an elliptical cross-section). In this embodiment, the bag is formed linearly on the front side 1a and is formed in an arc shape of 180 ° on the back side 1b, and has a semicircular shape as a whole. For this reason, the lengths of the opposed inner surfaces are different, and when the contents are actually poured out, even if the internal pressure is reduced, they are prevented from being in close contact with each other, and a smooth pouring operation can be performed. In addition to the semicircular shape,
For example, it may have a semi-elliptical shape.

FIG. 2 is a diagram showing a second embodiment of the present invention. The spout 20 in this embodiment is connected to the front side 1 of the bag.
a, an arc-shaped portion of 180 ° is formed on each of the back side 1b and the opening 20 is shifted from each other.
a and 20b are formed. Also in this embodiment, since the lengths of the opposed inner surfaces of the openings are different from each other, when the contents are actually poured out, even if the internal pressure is reduced, they are prevented from adhering to each other even if the internal pressure is reduced, and a smooth pouring is possible. Out operation is enabled.

FIG. 3 is a diagram showing a third embodiment of the present invention. The spout 30 in this embodiment is provided on the front side 1 of the bag.
a, two small-diameter 180 ° arc-shaped portions are formed on the back side 1b, and one large-diameter 180 ° arc-shaped portion is formed on the back side 1b. 3
0b and 30c are formed. Also in this embodiment, as in the above, when the contents are poured out, even if the internal pressure is reduced, they are prevented from sticking to each other, and a smooth pouring operation can be performed.

FIG. 4 is a diagram showing a fourth embodiment of the present invention. The spout 40 in this embodiment is provided on the front side 1 of the bag.
a, a rectangular opening 40a extending to the axially intermediate region of the spout 40 is formed, and a semicircular opening 4 extending to the axial tip region of the axial spout 40 on the back side 1b.
0b is formed. As described above, the spouts having the asymmetric shape may be formed so as to be shifted from each other in the axial direction. Also in this embodiment, as in the above, when the contents are poured out, even if the internal pressure is reduced, they are prevented from sticking to each other, and a smooth pouring operation can be performed.

FIG. 5 is a diagram showing a fifth embodiment of the present invention. The spout 50 of this embodiment is provided on the front side 1 of the bag.
a, a semicircular opening 50a extending from the axial base end of the spout 50 to the intermediate region is formed on the back side 1b.
Further, a semicircular opening 50b extending from the base end in the axial direction to the tip end region is formed. For this reason, as shown in FIG.
a, and the back side opening 50b,
Although it has a circular cross section, the tip region is shown in FIG.
As shown in FIG. 3D, only the opening 50b has a semicircular shape. Thus, in a part of the axial direction,
A configuration in which a portion having an asymmetric shape may be formed.
Also in this embodiment, as in the above, when the contents are poured out, even if the internal pressure is reduced, the contents are prevented from adhering to each other, and a smooth pouring operation can be performed.

Next, with reference to FIG. 6, a method for forming the above-described spout portion will be described. This figure shows a method of forming a spout having a semicircular cross section as shown in FIG.

As shown in FIG. 6A, sheets 1a and 1b made of a composite material having a sealant layer and a barrier layer
Are arranged such that the respective sealant layer sides face each other. In this arrangement, a mandrel 70 having a semicircular cross section is interposed between the two. Then, in such a state, the flat mold 75 and the concave mold 73 in which the arc-shaped concave part 73a is formed are pressure-bonded, and both are heat-sealed. In this case, the mandrel 70,
The concave mold 73 is maintained at room temperature, and the flat mold 75 is on the heating side. This is because, when a bulged asymmetric shape is formed, when the curved surface side is heated, it is thermally deformed, and a uniform shape and a uniform thickness cannot be maintained. And figure (b)
After being press-bonded and thermally fused as shown in FIG.
1 and the mandrel 70 is removed to form an asymmetric spout, one of which protrudes, as shown in FIG. The shape of the spout can be variously changed by changing the cross-sectional shape of the mandrel.

According to this manufacturing method, spout, a flat 75 that is heated, because it is formed only by crimping against concave type 73, Note heating time on the occasion to the outlet formation is extremely small Therefore, the influence of heat shrinkage of each material in the composite material can be minimized, and the occurrence of cracks and wrinkles in the spout can be suppressed. In addition, because of the heat fusion, the molding time is short and the manufacturing process is easy, so that a large amount and low cost of a bag container having a spout can be manufactured.

In the case where the spout is formed by the above-described steps, one of the sheets suffers heat shrinkage because the spout is asymmetric. For this reason, in the actual heating step, it is desirable to temporarily fix the stacked sheets or to adjust the size of the sheet shape in consideration of the heat shrinkage portion.

[0025]

As described above, according to the bag container of the present invention, the spout is formed in an asymmetric shape, so that the spout is prevented from sticking when the contents are poured out. The contents can be taken out smoothly.

In manufacturing the bag container constructed as described above, heat fusion is used in the same manner as in a normal bag container manufacturing process. It is possible to form a bulged portion having a uniform shape and a thickness almost equal to that of the main body sheet.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a bag container of the present invention, wherein FIG. 1 (a) shows an overall shape, and FIG.
Sectional drawing along the AA line of FIG.

FIGS. 2A and 2B are diagrams showing a bag container according to a second embodiment of the present invention, in which FIG. 2A shows a spout portion, and FIG. 2B is a view taken along line BB in FIG. Sectional view.

3A and 3B are diagrams showing a third embodiment of the bag container of the present invention, wherein FIG. 3A is a diagram showing a spout portion, and FIG. 3B is a diagram taken along line CC in FIG. Sectional view.

FIGS. 4A and 4B are views showing a fourth embodiment of the bag container of the present invention, wherein FIG. 4A is a view showing a spout portion, and FIG. 4B is a view along the line DD in FIG. Sectional view, (c) is figure (a)
Sectional drawing along the EE line of FIG.

FIG. 5 is a view showing a fifth embodiment of the bag container of the present invention, wherein (a) is a view showing a spout portion, and (b) is a view along the line FF in FIG. Sectional view, (c) is figure (a)
(D) is a sectional view taken along line GG of FIG.
Sectional drawing along the H line.

6A and 6B are views for explaining the method for manufacturing a bag container according to the present invention, wherein FIG. 6A is a view showing a state where a sheet, a mold and a mandrel are set, and FIG. 6B is a view showing a crimped state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag container, 1a, 1b ... Sheet (composite material), 2 ... Internal space, 10, 20, 30, 40, 50 ... Spout, 70 ...
Mandrel.

Claims (3)

(57) [Claims] 1. A sheet made of a composite material having a sealant layer and a barrier layer is overlapped and fused so as to form an accommodating portion for accommodating contents, and a spout for ejecting the contents is formed. A method for manufacturing a bag container, wherein the spout portion includes a room-temperature mandrel having a predetermined shape that defines a cross-sectional shape of the spout between the stacked sheets, and then , a room-temperature concave shape and a heated flat type. A method for manufacturing a bag container, wherein the bag container is formed by heating and fusing from a flat sheet side with a mold . 2. The method according to claim 1, wherein the mandrel has an asymmetric cross section. 3. The method according to claim 2, wherein the mandrel has a semicircular or semielliptical cross section.