JP2798808B2 - Manufacturing method of kagami mochi container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a rice cake container, and more particularly to a method for manufacturing a rice cake container from which rice cake can be easily taken out.

[Problems to be solved by conventional technology and invention]

Since ancient times, mirror rice cakes have been used in which flat rice cakes are stacked in two stages.

However, this mirror rice cake does not last long enough,
There is a problem that mold is formed within a relatively short period of time, and it becomes hard while cracking.

In recent years, as shown in FIG. 6, so-called packaged mirror rice cakes, in which a plastic container 1a is filled with a mirror rice cake 2, have been widely used.

This packaging mirror rice cake uses a container body part 3a formed by vacuum-forming a plastic sheet material into a mirror rice cake shape with an open bottom, inverts it, fills the rice cake 2, and then places the bottom part on a plastic bottom sheet. Sealed with 4, and then subjected to a heat treatment and subjected to a distribution process. Such a container body
For 3a, polypropylene or the like is used from the viewpoint of adhesion to the rice cake 2. Moreover, this polypropylene has a considerable thickness and hardness in order to ensure shape retention and gas barrier properties. Also, as the bottom sheet 4,
Various plastics are used similarly to the container body 3a.

With such a packaged rice cake, the above-mentioned problems of the traditional rice cake have been overcome, and the rice cake inside can be kept in a soft and delicious state for a considerably long period of time.

On the other hand, in order to take out the rice cake 2 from the container body portion 3a in the packaged mirror rice cake, the rice cake 2 is usually cut together with the container body portion 3a with a kitchen knife or the like, and then the container body portion 3a and the rice cake 2 are separated. This is because the container body portion 3a and the mochi are in close contact with each other, and it is not easy to remove the mochi just by peeling off the bottom sheet 4. However, when cutting the rice cake 2 together with the container body portion 3a with a kitchen knife or the like, the container body portion 3a has a certain degree of hardness and thickness as described above, so that a large pressing force is first applied with the kitchen knife or the like. Must be added, and the container body 3a
Has a problem that the kitchen knife is easily slipped and injured because the outer surface is smooth.

Therefore, the present inventors have proposed a mirror mochi container including a body portion of a mirror mochi container provided with a linear thin portion and a plastic bottom sheet for sealing the container body portion. 13
No. 1052).

In this mirror rice cake container, when the rice cake is cut with a kitchen knife or the like, slipping or the like is prevented by the groove of the linear thin portion, or the container can be easily opened by hand. In manufacturing the container, a plastic sheet is provided with a linear thin portion by a roller or the like, and then vacuum-formed. But,
Since the plastic sheet is relatively thick, a considerably large force is required to form a linear thin portion.
Therefore, if there is a more efficient manufacturing method, it is advantageous in terms of cost.

Therefore, an object of the present invention is to provide a method for efficiently manufacturing a mirror cake container having a linear thin portion.

[Means for solving the problem]

As a result of intensive research in view of the above problems, the present inventors have found that if a linear cut is made in a plastic sheet, the cut becomes a linear thin portion by vacuum forming,
The present invention has been made.

That is, the method of the present invention for producing a mirror rice cake container comprising a mirror rice cake-shaped container body provided with a linear thin portion, and a plastic bottom sheet for sealing the container body, comprises: After the cuts are made, the linear thin portion is formed by vacuum forming.

[Action]

In the present invention, after making a cut in the plastic sheet, by vacuum forming to the shape of a mirror cake,
Since the linear thin portion is formed, the mirror cake container can be manufactured efficiently.

The reason why such an effect can be obtained is that, when a plastic sheet is cut and vacuum-formed, the sheet cuts are widened and a linear thin portion is formed.

〔Example〕

 Hereinafter, the present invention will be described in detail.

1 and 2 are a side view and a front view of a kagami rice cake container obtained by the method of the present invention.

The mirror cake container 1 includes a container body 3 and a bottom sheet 4. The container body part 3 is formed by vacuum forming a plastic sheet-like material into a mirror cake shape having a constriction at the center and near the lower end, and a flange 5 is formed at the lower end.

The bottom sheet 4 is also made of a plastic sheet, and is heat-sealed to the flange 5 to seal the container body 3. As a material of the bottom sheet 4, a material having an easy peeling property with respect to the container body 3 is used so that the bottom sheet 4 can be easily peeled from the container body 3 when the rice cake 2 is taken out. In such a rice cake container, a linear thin portion 6 is formed on the outer surface of the rice cake-shaped portion of the container body portion 3. The flange 5 and the bottom sheet 4 have notches 7
Is provided to improve the openability.

In the present embodiment, the thin portion 6 is formed on the outer surface side of the container body portion 3, but may be formed on the inner surface side of the container body portion, or may be provided on both the outer surface and the inner surface.

A method for manufacturing such a mirror cake container will be described.

In the present invention, the sheet-like material serving as the container body is made of plastic as described above. There is no particular limitation on the plastic, and a simple plastic or a plastic laminate can be used.
As a simple substance of plastic, polypropylene is preferable, and as a laminate, a layered structure such as polypropylene / polyvinyl alcohol / polypropylene is preferable. Note that a higher fatty acid such as stearic acid can be added to the plastic resin for the purpose of improving the releasability between the container body portion 3 and the rice cake. When the sheet is made of a single plastic, a higher fatty acid may be added to the plastic. When the sheet is a laminated sheet, stearic acid or the like is added to the resin of the innermost layer (the surface in contact with the rice cake). May be added. When a higher fatty acid such as stearic acid is added, the amount is preferably 0.1 to 5% by weight.

The thickness of the sheet is appropriately set in accordance with the weight of the rice cake to be filled in the mirror rice cake container body 3. Since the weight of the rice cake to be filled into the above-mentioned mirror rice cake container body part 3 is usually about 160 g to 8 kg, it is preferable to use one having about 550 μm to 1.5 mm. If the thickness of the sheet is less than 550 μm, it will be difficult to maintain the mirror rice cake shape when filling the rice cake, and it will be difficult to have gas barrier properties.If it exceeds 1.5 mm, the sheet will be softened by the heater during vacuum forming. It is difficult to make it.

In the present invention, a cut is provided in such a sheet. FIG. 3 shows the sheet after forming the cuts. In FIG. 3, a notch 60 is provided substantially at the center of the square sheet 30, and a notch 7 is formed at one end of the notch.

The depth of the cut is preferably about 20 to 50% of the thickness of the sheet material 30, and particularly preferably 30 to 40%. For example, when the thickness of the sheet is 550 μm, the depth of the cut is preferably about 180 μm, and when the thickness of the sheet is 1.5 mm, the depth of the cut is preferably about 450 μm. The above notch is
It may be formed on one side or on both sides. When formed on both sides, the depth of cut is the thickness of the sheet
About 10 to 25% is preferable.

The method for forming the cut is not particularly limited, and may be, for example, laser processing or contact with a rotating circular blade. However, a method based on laser processing is preferable in terms of workability.

Examples of the laser for laser processing include a carbon dioxide gas laser, an argon ion laser, a YAG laser and the like, and a carbon dioxide gas laser is preferable in terms of output and the like.

The formation of the cut by such a laser may be performed by scanning a desired position on the surface of the plastic bottom sheet with a laser beam.

Further, the output of the laser may be appropriately set according to the material, thickness, depth of cut, and the like of the plastic bottom sheet.

The cut need not be formed so as to cross the center of the sheet-like material as in the present embodiment, and it is sufficient that the cut is at least at a position where the rice cake can be easily taken out, and does not need to be provided in the entire container.

Vacuum forming is performed on such a sheet. The method of vacuum forming may be a method usually performed, for example, a sheet-shaped material may be heated and softened by a heater or the like, and may be pressed against a female mold by sucking from a female mold side having a mirror cake shape. . Vacuum forming conditions vary depending on the type of plastic used, but usually the heating temperature of the sheet is 150 to 1
Preferably, the temperature is 80 ° C. and the degree of reduced pressure is 600 to 650 mmHg.
When a thin portion is provided on the outer surface of the container, the side in contact with the female mold may be the notch.

By vacuum forming the sheet-like material in this manner, the notch provided in the sheet is expanded at the portion having the mirror cake shape, and a thin portion as shown in FIG. 4 is formed. In the flange portion 5, the cut is not expanded and remains as it is. Thus, the container body 3 as shown in FIGS. 1 and 2 can be formed. The depth (a) of the groove formed by the thin portion of the vacuum formed portion is usually 20 to 30% of the thickness (b) of the sheet material after vacuum forming.

It is to be noted that the linear thin portion 6 is generally provided on the outer surface of the container. However, the thin portion 6 is not cut by a kitchen knife, and the container is torn by hand from the notch 7 along the preparation remaining in the thin portion 6 and the flange portion. When it is assumed, the thin portion may be provided on the inner surface side. Further, in order to obtain a lighter opening feeling, a thin portion may be provided on both sides by providing cuts on both sides of the sheet.

As the bottom sheet 4 for sealing the bottom of the mirror cake container body 3 obtained by such a method, various plastics can be used in the same manner as the above-mentioned body sheet.
In particular, it is preferable to use a single-layered material such as polypropylene or polyethylene, or a laminate thereof with polyester, aluminum foil, or the like. The thickness is preferably from 70 to 100 μm. Also, the size and shape of the bottom sheet need only be such that at least the opening at the bottom of the container body can be completely covered, but it is preferable that the bottom sheet is a square having substantially the same size as the sheet-like material.

By heat-sealing such a bottom sheet to the bottom of the container body after filling the rice cake, a packaged mirror rice cake can be obtained.

The packaged mirror cake thus obtained can be displayed in the same manner as a normal mirror cake.

When the contents of the packaged mirror rice cake are to be eaten, a knife of a kitchen knife is applied to the thin linear portion to cut the rice cake together with the container body portion, and then the rice cake is taken out of the container and cut into an appropriate size.

In the case where the notch is provided so as to cross the sheet as in the present embodiment, the bottom sheet is first peeled off from the container body, and then both sides of the notch 7 are held by hand to cut the sheet. After the container body portion is torn from the notch 7 along the thin portion 6 and the rice cake 2 is taken out, the rice cake 2 may be cut into an appropriate size.

Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to this, and by appropriately changing the position, length, shape, and the like of the cut provided in the sheet material, various container body parts can be provided. It can be.

For example, as shown in FIG. 5, a cut may be made so that the linear thin portion 6 is located only at the top of the container body portion, and further, the sheet is cut so that the linear thin portion is oblique. May be inserted.

Further, the sheet and the bottom sheet serving as the container body do not need to be square, but may be various shapes such as a rectangle and a rhombus.

The present invention will be described in more detail with reference to the following specific examples.

Example 1 A square sheet having a side length of 300 mm was cut out of a polypropylene sheet having a thickness of 0.55 mm. A notch was provided at the approximate center of this sheet, and laser processing was performed at 17 W using a carbon dioxide laser processing machine (LASUC-4000, manufactured by Seidensha Electronics Co., Ltd.). A cut of about 15 cm and a depth of about several μm was made.

The container body part sheet thus obtained was placed on a frame having a female mold so that the outer surface was cut, and vacuum-formed at a heater temperature of 180 ° C. and a degree of vacuum of 650 mmHg. In the thus obtained mirror body container part, the cut of the sheet was a linear thin part having a depth of about 100 μm.

Further, 550 g of rice cake was filled in the obtained rice cake container body, and after cooling, the bottom of the rice cake container was heat-sealed with a laminated sheet of polyester and nylon (thickness: 80 μm).

When this packaged mirror rice cake was torn by hand from the notch, it could be easily opened along the linear thin portion.

Further, when the kitchen knife was pressed against the linear thin portion of the packaged mirror rice cake to cut the rice cake together with the container, the kitchen knife could be cut safely without slipping.

Example 2 A square sheet having a side length of 300 mm was cut out of a polypropylene sheet having a thickness of 0.55 mm. A notch is provided at the approximate center of this sheet, and a depth of 0.17
A mm cut was made with a rotating circular blade.

The container body part sheet thus obtained was placed on a frame having a female mold so that the outer surface was cut, and vacuum-formed at a heater temperature of 180 ° C. and a degree of vacuum of 650 mmHg. In the thus obtained mirror body container portion, the cut of the sheet was a linear thin portion having a depth of about 0.15 mm.

Further, 550 g of rice cake was filled in the obtained rice cake container body, and after cooling, the bottom of the rice cake container body was heat-sealed with a laminated sheet of polyester and nylon (80 μm thick).

When this packaged mirror rice cake was torn by hand from the notch, it could be easily opened along the linear thin portion.

Moreover, when the kitchen knife was pressed against the thin linear portion of the packaging mirror wire and the whole rice cake was cut, the kitchen knife could be cut safely without slipping.

〔The invention's effect〕

As described in detail above, according to the method for manufacturing a kagami mochi container of the present invention, after a cut is made in a plastic sheet, vacuum forming is performed, and a mirror mochi shape having a constriction near the center and lower end is formed as a body part. Therefore, it is possible to easily form a linear thin portion.

In particular, if the cuts are provided by laser processing, a sheet for the body of a mirror cake container having the cuts can be manufactured efficiently.

[Brief description of the drawings]

FIG. 1 is a side view of a mirror rice cake container according to the method of the present invention, FIG. 2 is a front view of the mirror rice cake container according to the method of the present invention, and FIG. 3 is a plan view of a sheet serving as a mirror rice cake body. FIG. 4 is a schematic view showing a state of a thin portion of a sheet, FIG. 5 is a side view of another kagami rice cake container according to the method of the present invention, and FIG. It is a longitudinal cross-sectional view. 1… container for kagami mochi 2… mochi 3, 3a… container body 4… bottom sheet 5… flange 6… thin section 60… cut 7… cutout

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ identification code FI B29L 22:00 (58) Fields surveyed (Int.Cl. ⁶ , DB name) B29C 51/04-51/14 B29C 51/18 -51/46 B65B 31/02 B65D 81 / 20,77 / 38 B29K 23:00 B29L 9:00 B29L 22:00

Claims (4)

(57) [Claims] 1. A method for manufacturing a mirror rice cake container comprising: a mirror rice cake-shaped container body provided with a linear thin portion; and a plastic bottom sheet for sealing the container body. A method for manufacturing a mirror rice cake container, wherein the linear thin-walled portion is formed by forming a notch in the container and vacuum forming. 2. The method according to claim 1, wherein the plastic sheet of the container body is a monolayer of polypropylene or a laminate of polypropylene / polyvinyl alcohol / polypropylene. Manufacturing method. 3. The method according to claim 1, wherein the cut is provided by laser processing. 4. The method according to claim 3, wherein said laser processing is performed by a carbon dioxide gas laser.