JP3005707B2 - Manufacturing method of packaging container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates also relates to a method of manufacturing a packaging container made of synthetic resin, are those concerning the manufacturing process of the packaging containers to be particularly multi-piece from a synthetic resin sheet.

[0002]

2. Description of the Related Art A synthetic resin packaging container of this type is provided as a very inexpensive material by mass production, but its production is generally performed by molding as shown in FIG. This is done by the device 20.

That is, after cutting a synthetic resin sheet 10a, which is a long polyethylene paper having a thickness of, for example, 3 to 4 mm by foaming, into a predetermined length at a fixed-size cutting section 21, the synthetic resin sheet 10a is cut. The sheet 10a is heated as required and carried into the molding machine 23. Since a mold for forming a large number of packaging containers for one synthetic resin sheet 10a is arranged in the molding machine 23, the molding machine 23 performs, for example, vacuum molding or pressure molding. By means, a large number of packaging containers as shown in FIG. 3 are molded. The predetermined length cutting of the synthetic resin sheet 10a at the fixed length cutting section 21 may be performed after the molding of each packaging container by the molding machine 23.

After the molding, the molded synthetic resin sheet 10a is transferred to a punching machine 23 at the next stage to form individual packaging containers connected by ears 13;
Further, each packaging container is separated by the separator 24 at the next stage.

In the above-described molding apparatus 20, the packaging containers must not be separated from each other during the transfer of the molded synthetic resin sheet 10a from the punching machine 23 to the separator 24. The reason is that, in the separator 24, each of the separated packaging containers is packed in a predetermined number, for example, in a bag, but if the packaging resin is molded from the molded synthetic resin sheet 10a, one packaging container is formed. Is missing, the whole lot becomes a defective lot with insufficient quantity.

[0006] Therefore, as shown in FIG. 6, a connecting portion forming groove 26 is formed in the punching blade used in the punching machine 23, that is, the Thomson blade 25. The Thomson blade 25 is basically for punching the outer shape of a packaging container as a product.
Numeral 6 is to leave a connection portion 14 for partially connecting each product to an ear 13 to be scrapped as shown in FIG. This allows each product to:
As shown in FIG. 3, the outer shape is punched by a Thomson blade 25 as being connected to the ear 13 via each connection portion 14, and is transferred to the separator 24 while being integrated with the ear 13. It will be. Separator 2
In 4, since each connecting portion 14 is cut by pushing each product with a rod or the like, each product becomes a single product separated from the ear 13.

In the conventional packaging container formed as described above, the projection 30 is often left on the outer edge of the punched flange 31, as shown in FIG. The projection 30 is actually formed by the above-described connecting portion 14 remaining on the outer edge of the flange 31 as it is, but is formed for the following reason. That is, the connecting portion 14 is formed by the connecting portion forming groove 26 of the Thomson blade 25 described above. The connecting portion forming groove 26 of the Thomson blade 25 is, as shown in FIG. The connection portion 14 has the same width as shown in the upper part of FIG. Therefore, when trying to divide the connecting portion 14, as shown in FIG.
The cut portion 32 may be biased toward the ear 13 side,
As a result, the connection portion 14 becomes a protrusion 30 and remains on the product side.

Although the projection 30 is small according to the width of the connecting portion forming groove 26 of the Thomson blade 25,
If this exists on the outer edge of the flange 31, the wrap will be damaged when the wrap is applied. In other words, when food is stored in this type of packaging container, in order to prevent the food from drying and maintain its freshness,
It is necessary to wrap a wrap which is a transparent thin synthetic resin film, and this wrap can be easily torn even with a small projection 30. In particular, the protrusion 30 is
If it is at the outer edge of the wrap, it will cause damage to the wrap, which must come here.

When the synthetic resin sheet 10a is relatively hard, for example, the projections 30 may not only give a discomfort to the worker who handles the packaging container, but also cause the projection to be hung on the machine. When the storage and wrapping operations are to be automated, the projections 30 may be caught in the machine, making automation difficult.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and the problem to be solved is that when a large number of packaging containers are taken from one synthetic resin sheet, each of them is required. The elimination of the projections 30 that are likely to occur at the edges of the flange of the packaging container.

That is, the object of the present invention is as follows.
An object of the present invention is to provide a manufacturing method of a packaging container 10 having a simple configuration that can eliminate breakage of a wrap and inconvenience during handling by positively forming a cutout 12 at an edge of a flange.

[0012]

In order to solve the above problems BRIEF SUMMARY OF THE INVENTION, means of adopting the present invention is explained with reference numeral used in the examples, the "synthetic resin sheet 10a
A method of manufacturing a large number of packaging containers 10 through the following steps. (1) After softening the synthetic resin sheet 10a,
Packaging containers 1 connected via ears 13
Step of molding a 0; (2) Hula each packaging container 10, which is formed thereon
In this case, the flange 11 and the ear 13 are connected at the connection part 14.
In order to reduce the scrap side groove 26a and the smaller product side
Thomson having connection portion forming groove 26 composed of groove 26b
Upon separating the (3) each packaging container 10 from the ear 13; step of punching the edge 25
Then, the connection part 14 is connected to the ear 13 together with the flange 11 on the product side.
By leaving it on the edge of the flange 11
Forming a cut portion 12 that slightly bites into the product side from (4) by repeating the above steps,
For removing a large number of containers 10 from the synthetic resin sheet 10a
About .

That is, the packaging container 10 of the present invention
According to the manufacturing method , after being formed by the mold forming machine 23 of the forming apparatus 20, it is punched by the Thomson blade 25 of the punching machine 23.
Since 1 is connected to the ear 13 which does not become a product at the connecting portion 14, when transported from the punching machine 23 to the separator 24, many things are integrated with the ear 13 and do not fall apart. It is something to be done. And, the packaging container 10 which has finally become independent
This is because the connection portion 14 remains on the side of the ear 13 so that the cutout portion 12 is formed at the edge of the flange 11.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to form a packaging container 10 in which such cutouts 12 are positively formed, a manufacturing method must be established. The manufacturing method is as follows. . That is, the packaging container 10 can be basically manufactured by using a conventional molding device 20 as shown in FIG. 5, but by using the molding device 20, the synthetic resin sheet 10a can be manufactured. Each packaging container 1
The Thomson blade 25 as shown in FIG. 2 may be employed in the punching machine 23 for individually punching 0s.

In the Thomson blade 25, when the outer shape of the packaging container 10 is punched from the synthetic resin sheet 10a, as shown in FIG.
1 and a connecting portion forming groove 2 for forming a plurality of small connecting portions 14 between the ear 13 discarded as scrap.
6 are formed. As shown in FIG. 2, the connecting portion forming groove 26 of the Thomson blade 25 has a scrap side groove 26 a that increases toward the ear 13 side and a product side, that is, toward the flange 11 side of the packaging container 10. When the synthetic resin sheet 10a is punched out by a Thomson blade 25 having such a connecting portion forming groove 26, the synthetic resin sheet 10a is partially divided into a product side groove 26b having a smaller size. It becomes like.

That is, in the vicinity of the cutting line L which is the outer shape of the packaging container 10, the flange 11 of the packaging container 10
The connecting portion 14 that slightly connects the lug 13 and the lug 13 is not largely cut by the scrap-side groove 26a in the lug 13 on the lug 13 side, so that the thickness is about the thickness of the synthetic resin sheet 10a. It remains close in thickness. On the other hand, the connecting portion 14 on the right side of the cutting line L in FIG.
b has been reduced, the synthetic resin sheet 1
The connection is made at a thickness of about half or less of the thickness of Oa.

Therefore, when each packaging container 10 is forcibly separated from the ear 13 in this state, a cut 15 as shown in FIG. Therefore, as shown in (b) of FIG. 4, in a state where the connection portion 14 or a part of the connection portion 14 and the flange 11 remain on the ear 13 side,
Each packaging container 10 is separated from the synthetic resin sheet 10a as having the cutout 12 at the edge of the flange 11 thereof.

That is, each of the resection portions 12 is formed as shown in FIG.
8 is a small concave portion remaining on the edge of the flange 11 as shown on the upper side of the drawing, and never becomes a projection 30 at least as in the conventional packaging container shown in FIG.

The packaging container 10 according to the present invention constructed as described above has a plurality of cut portions 1 at the edge of the flange 11 thereof.
2, each of the cutouts 12 is very small, so that even if the packaging container 10 is the dish-shaped one shown in FIG. Even if it is a so-called deep cup shape shown in b), the flange 1
1 has no effect on securing the rigidity of the opening provided to the packaging container 10 at all.

It is particularly important that the packaging container 10
In the case of the conventional packaging container 10 shown in FIG. 8, the projection 30 remains at the edge of the flange 11 of the conventional packaging container 10, but such a projection 30 does not exist at all. The cut portion 12 opposite to 30 has a flange 11
This means that even if the packaging container 10 is wrapped with a fragile wrap,
The wrap is never damaged.

Each of these excision parts 12 is shown in FIG.
Small remaining on the edge of the flange 11 as shown on the upper side of the figure
Or the lower part shown in FIG.
Straight line that matches the edge of the flange 11
In any case , each of these resections
Reference numeral 12 denotes at least the conventional packaging container shown in FIG.
The projections 30 are never formed.

Further, since each cutout 12 is literally recessed at the edge of the flange 11, it does not catch on human hands, gloves, or a part of a machine. Can be performed smoothly without any trouble.

Furthermore, each cutout 12 is formed by cutting a part of the synthetic resin sheet 10a, and although it is likely to have an irregular shape, it is small, so that it is necessary to pay close attention to it. Otherwise, it is invisible and the quality of the packaging container 10 is not affected at all. The reason for this is that the connecting portion 14 that has been the basis of the cutout portion 12 is, at the time of transfer from the punching machine 23 of the molding apparatus 20 to the separating machine 24 and at the time of setting the synthetic resin sheet 10a by the separating machine 24, in the first place. This is because the packaging container 10 only needs to be connected to the ears 13, so that the packaging container 10 is very thin, and the cutout portion 12 formed by shredding such a thin connection portion 14 is also very small.

[0024]

EXAMPLES Next, when explain the concrete manufacturing method of the packaging container 1 0 according to the present invention configured as described above is as follows.

First, as for the synthetic resin sheet 10a, in this embodiment, a long foamed polyethylene (density: 0.148 g / cm ² ) having a thickness of 1.65 mm and a width of 1,040 mm is employed. The flow is made to flow through the molding device 20 shown in FIG. In the fixed-size cutting section 21 of the molding apparatus 20, since the size of the mold in the next-stage molding machine 23 is 1000 mm, the synthetic resin sheet 10a is cut to match this length. Are sent to the molding machine 23 one by one. In the molding machine 23, a mold for taking a large number of the packaging containers 10 is installed. By molding each synthetic resin sheet 10a for 2 seconds by the molding machine 23, as shown in FIG. Is formed.

The predetermined length cutting of the synthetic resin sheet 10a at the fixed length cutting section 21 is performed after the molding of the packaging container by the molding machine 23 as described in the section of the prior art. Sometimes. Further, in the present embodiment, in order to facilitate the molding with the molding machine 23, the synthetic resin sheet 10a is heated to about 110 ° C. in the previous stage, or the heating is performed at an ambient temperature of 230 ° C. It is made to soften by passing through the furnace for about 18 seconds.

The molded synthetic resin sheet 10a is sent to a punching machine 23, where each of the packaging containers 10 is punched.
As shown in the above, each packaging container 10 is connected to each ear 13 which is to be scrap at each connection portion 14. The reason for doing so is that if each packaging container 10 is punched out by this punching machine 23 so as to be completely separated, it becomes difficult to prepare for taking out each packaging container 10 and packing it together. Since it becomes difficult to continuously form the various types of packaging containers 10 in a short time, the punching is performed by the punching machine 23, and the separation of each packaging container 10 is performed by the next separator 2
This is because it is necessary to share the work, for example, as described in 4.

In the punching machine 23, a Thomson blade 25 for punching each packaging container 10 from the synthetic resin sheet 10a is employed. Flange 11
Connecting part 14 and the ear 13 to be scrapped
Is formed as shown in FIG. The connecting portion forming groove 26 is for forming the connecting portion 14 while leaving a part of the synthetic resin sheet 10a, and is divided into a scrap side groove 26a on the left side in the drawing and a product side groove 26b on the right side in the drawing. That is, the scrap-side groove 26a is formed on the synthetic resin sheet 10 on the side of the ear 13.
a is formed as deeply as possible so as not to be cut as much as possible. In this embodiment, the opening of the scrap side groove 26a at the left end face in FIG. 2 is about 2 mm. On the other hand, the product side groove 26b is formed to be as shallow as possible so as to make a cut as much as possible in the synthetic resin sheet 10a on the flange 11 side. It is set to about 1 mm.

As described above, when the punched synthetic resin sheet 10a is punched out by the punching machine 23 having the Thomson blade 25, the synthetic resin sheet 10a is provided in each packaging container as shown in FIG. 10 is formed at each connection portion 14 to be connected to the ear 13. Accordingly, the packaging containers 10 are transported to the next-stage separator 24 without being separated from each other while being connected via the ears 13.

In the separator 24, the ears 13 on the outer periphery of the synthetic resin sheet 10a are fixed, and each packaging container 10 is separated from the ears 13 by, for example, pressing down. The containers 10 are sent to a portion for packing a predetermined number of containers through a chute or the like (not shown) arranged at that position.

When the separation state at this time is examined in detail,
This is as shown in FIG. 2 and FIG. That is, the packaging container 10 before being separated is connected to the ear 13 via each connection portion 14 as shown in FIG. 4A, but the ear 13 side is fixed. When the pressing force is applied to the packaging container 10, each connecting portion 14
A cut 15 as in the synthetic resin sheet 10a shown in FIG. Since the cut 15 is thin on the flange 11 side of the connecting portion 14,
It will almost certainly enter the flange 11 side. That is, as shown in (b) of FIG.
It is almost always left on the side of the ear 13, so that each connection portion 1 of the edge of the flange 11 of the packaging container 10 is formed.
In the portion corresponding to No. 4, as shown in FIG.
2 is surely formed.

[0032]

As described above, according to the present invention,
As exemplified in the above embodiment, the " synthetic resin sheet 10a
How to manufacture a number of packaging containers 10 through the following steps from
Law. (1) After softening the synthetic resin sheet 10a,
Packaging containers 1 connected via ears 13
Step of molding a 0; (2) Hula each packaging container 10, which is formed thereon
In this case, the flange 11 and the ear 13 are connected at the connection part 14.
In order to reduce the scrap side groove 26a and the smaller product side
Thomson having connection portion forming groove 26 composed of groove 26b
Upon separating the (3) each packaging container 10 from the ear 13; step of punching the edge 25
Then, the connection part 14 is connected to the ear 13 together with the flange 11 on the product side.
By leaving it on the edge of the flange 11
Forming a cut portion 12 that slightly bites into the product side from (4) by repeating the above steps,
For removing a large number of containers 10 from the synthetic resin sheet 10a
The process is characterized by the fact that the cutout 12 is positively formed at the edge of the flange, thereby simplifying the packaging container 10 that can eliminate breakage of the wrap and trouble during handling. It can be provided by the configuration.

[Brief description of the drawings]

[1] shows the hull wearing container formed by engaging Ru manufacturing method according to the present invention, (a) is dish-shaped, and (b) is a perspective view illustrating the intended cup-shaped.

2 is a partially enlarged sectional view showing the relationship between the state and the connection portion and the Thomson blade showing when forming the cut portion of the packaging wear container.

FIG. 3 is a perspective view of the synthetic resin sheet showing a state in which a large number of packaging containers are formed on the synthetic resin sheet and each packaging container is punched by a punching machine.

FIG. 4 is a partially enlarged plan view showing a state before and after a state in which each packaging container is separated from an ear, divided into (a) and (b).

By engaging Ru manufacturing method [5] The present invention is a schematic front view of a molding apparatus used in manufacturing the packaging wear container.

FIG. 6 is a partially enlarged perspective view showing a conventional Thomson blade.

FIG. 7 is a partially enlarged cross-sectional view of the Thompson blade, focusing on a connecting portion forming groove.

FIG. 8 is a perspective view showing a conventional packaging container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Packaging container 10a Synthetic resin sheet 11 Flange 12 Cut part 13 Ear 14 Connection part 15 Cut 20 Forming device 21 Fixed size cutting part 22 Molding machine 23 Punching machine 24 Separator 25 Thomson blade 26 Connection part forming groove 26a Scrap side groove 26b Product side groove 30 Projection 31 Flange 32 Cutting part L Cutting line

Claims (1)

(57) [Claims] 1. A large number of packaging containers are formed from synthetic resin sheets.
Manufacturing method through the steps of (1) After softening the synthetic resin sheet, scrap it
Molds a large number of packaging containers connected through ears
Step: (2) Flange formed on top of each packaging container
So that the ear and the ear are connected at the connection.
Connection consisting of a wrap groove and a smaller product groove
Punching out with a Thompson blade having a forming groove; (3) before separating each packaging container from the ear,
Leave the connection together with the flange on the product side on the ear side.
With this, the edge of the flange, the product side from this edge
Forming a cut portion that bites into the container; (4) By repeating the above steps, each packaging container
Removing a large number of containers from the synthetic resin sheet.