JP2881390B2 - Bag and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a side gore body which is effectively welded to a peripheral portion of a sheet-like base member having a housing side and a lid side formed continuously and which can be opened and closed. Regarding the bag and the manufacturing method thereof, in particular, even if the base and the side gore body are difficult to weld to each other,
The present invention relates to a bag in which a side gore body is simply and effectively welded to a peripheral portion of a sheet-like base, and a method of manufacturing the bag.

[0002]

2. Description of the Related Art A bag provided with a side gore body at a peripheral portion of a sheet-like base member which is open and closeable and has a housing side and a lid side formed continuously is formed by folding the base member. The side gore bodies are provided only on the housing side of the base (see FIG. 4A), and the side gore bodies are overlapped with each other so as to correspond to both the housing side and the lid side when the base is folded. (See FIG. 4 (b)). In these, the means for attaching the side gore body to the base is such that the base end of the side gore body to be attached to the base faces inward. It is common practice to dispose the base on the base and then heat it while pressing down the base end from above with a welding machine so that the base is welded integrally with the base. The reason why the base end of the side gore body is arranged inwardly for welding in this way is that the welding machine is operated by the side gore as the base end is arranged inwardly. Since it is located inside the body, it is possible to check whether the base end protrudes from the outside during welding, and since the side gore body is located outside the welding machine, after it is welded to the base It is very easy to remove the side gore body from the welding machine.Furthermore, it is easier to wind the side gore body around the outside of the welding machine. This is because it is very preferable.

[0003] However, such means for attaching the side gore body to the base body by welding is, indeed, if the base body and the side gore body are easily welded to each other, there is no way to weld the side gore body to the base body. It can be done without problems, but on the other hand,
Since the side gore body and the base are basically required to be weldable to each other, the materials of the base and the side gore body to be combined are necessarily limited to those having the same properties. Therefore, it is not preferable to combine two materials having different textures in a wide range, because it deprives the design freedom of poor design change that is difficult. In addition, since the side gore body is directly welded to the base, when the base is made of a transparent or translucent body, the welded base end of the side gore body is exposed to the opposite side through the base. It is also not preferable because it makes it look bad. Further, since the welded portion exists inside the housing side, an unnecessary welding step is generated.

[0004] To cope with the case where the base and the side gore body are made of materials which are difficult to weld, Japanese Patent Application Laid-open No. Hei.
As described in Japanese Patent No. 39423, a joint made of a material that can be welded to a side gore body is attached to a base in advance, and the joined body and the side gore body are welded to each other, so that the base and the side gore body are difficult to weld. It has been considered to make it possible to perform welding without any problem when using different materials, and to solve the problem that the base end is transparent through the attached joined body.

[0005]

However, in the means in which the joined body is attached in advance, various inconveniences may occur depending on the width of the joined body attached to the peripheral portion. After all it is not preferable. In other words, if the width of the joined body is only narrow enough to allow the base end of the side gore body to be welded just barely, the side gore body stands upright at the peripheral edge with the conventional welding means. The lid side did not fit well with the storage side when the bag was closed, and the lid side shifted and collapsed into the storage side as shown in FIG. Like that,
Alternatively, as shown in FIG. 6A, there is a possibility that the lid may not be able to be closed because the side gore bodies on the lid side and the accommodation side are present at the same position. It will be something. Therefore, in order to eliminate this fear, as shown in FIG. 5 (b), a joined body made of a material that can be welded to the side gore body has a wider range.
l, and the upright position of the side gore body is slightly shifted to the inside of the base, or as shown in FIG.
It is necessary to provide a joined body made of a material that can be welded to the side gore body on the accommodation side so as to have a wider range m '>l', so that the standing position of the side gore body is slightly shifted to the inside of the base.

However, if the width of the joined body is widened unnecessarily, a large number of wrinkles are generated at the time of attaching the joined body at the peripheral corners of the base, so that it is difficult to perform the bending and attaching work. In addition, it is not possible to coat the peripheral corners neatly and wrinkles are generated, so that only the peripheral corners of the joined body become thick, and it is difficult to uniformly weld the side gore bodies to the joined body. Inconveniences such as Therefore, in order to eliminate the generation of wrinkles and cleanly cover the joint, if the joint is attached to the peripheral corner while forcibly pulling the joint, the peripheral corner of the base may be distorted (FIG. 7 ( 56)), or the joined body portion at the peripheral corner is damaged (FIG. 8).
(Refer to (66)). Further, the joined body at the peripheral edge may be neatly folded and covered (see FIG. 9 (76)), or the joined body may be cut once at the peripheral corner, change the direction, and then be covered again ( (See FIG. 10 (86)), the attachment of the joined body is complicated and takes a considerable amount of time, and the peripheral edge has a thickness (step), which makes it difficult to form a flat and difficult to weld. It is not preferable because it will be lost.

As described above, the side gore body is efficiently and easily attached to the base even when the base and the side gore body are made of a material that is difficult to weld to each other. What has been preferred has not been obtained so far. The present invention is intended to address the above-described problems, and has achieved the object by the completion of the invention described below.

[0008]

According to the present invention, there is provided a sheet-like base body in which a housing side and a lid side are formed continuously and face each other or are separated from each other, and a base end is attached to the base body. In the bag which can be closed and opened with the side gore body provided so as to stand up on the peripheral portion of the base, the side gore body is made of a heat-wearable thermoplastic resin.
Made of oil, can be attached to each other for heat attached to the periphery of the base
Body made of functional thermoplastic resin and its base end outside
Is attached to the peripheral portion of the base by welding in a state where the housing side and the lid side are formed by bending the sheet-like base,
Next, a thermoplastic resin that can be heat- bonded to the peripheral portion of the base is used.
Sewn together and attach
The joint body is made of a thermoplastic resin that can be heat-bonded to each other.
Weld the side gore body so that the base end faces outward.
The side gore body is provided upright on the peripheral portion of the base by attaching the base.

At this time, the side gore body is provided only on the housing side of the base.
In addition to the ones that are
The side gore body accommodates the base.
If it is provided only on the side, a sheet-like substrate
The base end faces the outer edge of the storage side.
By attaching the side gore body to the
A side gore body is provided upright at the edge,
The side gore bodies are provided on both the housing side and the lid side of the base.
In the case of a sheet-shaped substrate,
Take the side gore body so that the base end faces outward.
The lid has a lid-side periphery with its base end facing inward.
The side gore body is attached so that
You.

Further, according to the present invention, the joined body has a width substantially equal to the width of the base end of the side gore body attached to the base, or the joined body can be attached to the peripheral edge of the base by sewing. The joined body may be continuously coated so as to surround the peripheral portion of the base, or may be used in combination as appropriate.

The shape of the side gore body includes an opening-shaped wall body provided upright along the peripheral edge of the base body and arranged so that both ends of the side gore body are spaced from each other. And is provided along the peripheral edge portion of the side gore body, and is provided so as to stand up so as to cross the substrate, and includes an annular wall body arranged so that both end portions of the side gore body are connected to each other. In the case of the wall body described above, a joint body to which the base end of the side gore body is attached is provided appropriately at a portion crossing the base.

[0012]

When the base of the side gore body, which is provided upright on the peripheral edge of the base, is attached to the outside, the welding position of the side gore on the base is not changed. Only the standing position of the body is shifted slightly inward. Further, when the width of the joined body is set to be substantially equal to the width of the base end of the side gore body to be welded, it becomes easy to bend the joined body at the corners of the corner, and the covering of the periphery of the base is covered. It can be performed continuously. Moreover, there is no hindrance to the welding of the side gore body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the case of the present invention, in the case where each side gore body is provided so as to overlap each other corresponding to both the storage side and the lid side when the base is folded,
As shown in FIGS. 1 to 3, the storage side (8) and the lid side (9)
And rigid or semi-rigid synthetic resin formed continuously,
For example, a sheet-like base body (1) made of polypropylene and capable of being opened and closed, and a joined body made of a heat-sealable thermoplastic resin, for example, a vinyl chloride resin attached along the periphery of the base body (1) (2) and a housing side made of, for example, vinyl chloride resin, which is provided upright on the peripheral portion of the base (1) by welding the base end (5) to the joined body (2). (8) Side gore body (3a)
And a side gore body (3b) on the lid side (9),
The joined body (2) is sewn to the periphery of the base body (1) with a sewing machine or the like, and then the joined body (2) on the accommodation side (8) of the base body (1).
The side gore body (3a) is placed upright so that the base end (5a) faces outward, and then the base end (5a) is placed.
a) and the joined body (2) are pressed together and integrally heated and welded, so that the welded portion (7a) is positioned outside the side gore body (3a) and on the joined body (2). In addition, the side gore body (3) is formed around the accommodation side (8) of the base (1).
a) and the side gore body (3b) is placed upright on the joined body (2) on the lid side (9) such that the base end (5b) faces inward. Base end (5b)
And the joined body (2) are pressed together and integrally heated and welded so that the welded portion (7b) is positioned inside the side gore body (3b) and on the joined body (2). At the same time, a side gore body (3b) is provided on the periphery of the lid (9) of the base (1).
Shall be provided. Thereafter, a fastener (10) is attached to the back side of the storage side (8) of the base (1), and the bag (A) is attached.
And

At this time, the joined body (2) is
The width is substantially equal to the width of the base end portion (5) of the side gore body (3) to be welded to the base, and is continuously coated so as to wrap the peripheral portion of the base (1). Specifically, when the substrate (1) is a sheet having a length of 48 cm and a width of 32 cm,
The width of the joined body (2) may be about 5 to 8 mm.

The material of the base (1) is not particularly limited, and may be a flexible synthetic resin material, a rigid or semi-rigid synthetic resin material, or a cardboard with a cloth or the like adhered to the surface thereof. Absent. The side gore body (3) is made of a material that can be welded to the joined body (2), but does not need to be entirely formed of the same material, and is welded by covering a rigid or semi-rigid core material with the same material. It does not matter if it becomes possible.

[0016]

As described above, according to the present invention, the side gore body
And a joint made of thermoplastic resin that can be heat-bonded to each other.
Attached to the peripheral edge of the base, it is possible to enrich the design by combining materials widely regardless of the material of the base and the side gore body, and to improve the base of the side gore body attached to the base. The appearance can be beautiful without the end portion being exposed to the opposite side through the base. Also , since the side gore body can be efficiently attached without making the width of the joined body unnecessarily large, wrinkles and the like do not occur at the time of attaching the joined body, and the wrinkles are caused. It can be performed without any inconvenience. Moreover, according to the present invention, the side gore body can be easily attached in accordance with the conventional means.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bag of the present invention.

FIG. 2 is a development view illustrating the structure of the bag of the present invention.

FIG. 3 is a partial side sectional view illustrating an attached state of a side gore body.

4A and 4B are perspective views showing a conventional bag.

FIGS. 5A and 5B are side sectional views for explaining a mounting state of a side gore body of a conventional bag.

6 (a) and 6 (b) are side sectional views for explaining a mounting state of a side gore body of a conventional bag.

FIG. 7 is a partially enlarged perspective view illustrating a state of attachment of the joined body to the base.

FIG. 8 is a partially enlarged perspective view illustrating a state of attachment of the joined body to the base.

FIG. 9 is a partially enlarged perspective view illustrating a state of attachment of the joined body to the base.

FIG. 10 is a partially enlarged perspective view illustrating a state of attachment of the joined body to the base.

[Explanation of symbols]

A: Bag 1: Base 2: Joined body 3: Side gore body 5: Base end 7: Welded part 8: ·················································· Fasteners 11, 21, 31, 41, 51, 61, 71, 81 ···
... Substrates 32, 42, 52, 62, 72, 82 ...

Claims (7)

(57) [Claims] 1. A sheet-like base body in which a storage side and a lid side are formed continuously and face each other or are separated from each other, and a base end is attached to the base body to stand on a peripheral edge of the base body. In a bag that can be closed and opened with a side gore body provided to
Is made of heat-sealable thermoplastic resin, and is
Attached made of thermoplastic resin that can be attached to each other for heat
Welding and welding with the base end facing outward
Characterized in that the bag is attached to a peripheral portion of the base body . 2. The bag according to claim 1, wherein the side gore body is provided only on the housing side of the base. 3. The side gore body is provided on both the housing side and the lid side of the base, and is attached to the base with only the base end of the side gore portion on the housing side facing outward. The bag according to claim 1, wherein the base end of the side gore portion on the lid side is attached to the base body in a state facing inward. 4. The joined body is a side gore body attached to a base.
Having a width substantially equal to the width of the base end of the
The bag according to any one of claims 1 to 3, characterized in that: 5. The joined body is formed on the base by sewing.
Characterized by being attached to the periphery
A bag according to any one of claims 1 to 4. 6. The joined body is connected so as to surround the periphery of the base.
Claims characterized by being coated successively
The bag according to any one of 1 to 5. 7. The method according to claim 7, wherein the sheet-like substrate is bent.
The receiving side and the lid side are formed, and then the substrate
A bonded body made of thermoplastic resin that can be attached for heat
Attach by sewing, and furthermore,
The base end is made of a side gore made of thermoplastic resin
Be sure to weld and attach so that the
Thus, the side gore body is provided upright at the peripheral portion of the base.
A method for producing a bag.