JP7445941B2 - packaged rice ball - Google Patents

Description

The present invention relates to a packaging material for rice balls.

A widely used packaging material for rice balls is one in which a sheet of seaweed is stored between the outer sheet and the inner sheet, so that the nori sheet does not come into contact with the rice balls when the rice balls are being packaged. . The two inner sheets are arranged so that their edges overlap along the centerline, and the overlap is not bonded or has a weak connection that easily separates. On the other hand, the outer sheet is provided with an opening aid line such as cut tape along the center line, which allows the outer sheet to be cut left and right when opening the package. For example, Patent Document 1 and Patent Document 2 describe an outer wrapping film for rice balls, in which an opening aid tape is attached to a rectangular film body, and a disk-shaped rice ball is wrapped with this outer wrapping film for rice balls. . When ready to eat, use this opening aid tape to open the package. In addition to this, packaging materials for rice balls that have been put into practical use so far are made of plastic film.

Patent Document 3 describes a packaging material for rice balls in which an outer film 1 is provided with a surface layer made of paper or nonwoven fabric. Further, Patent Document 4 and Patent Document 5 describe packaging materials for rice balls using glassine paper.

Design Registration No. 1203540 Publication Design Registration No. 1204011 Publication JP2004-26536 JP2000-62835 JP2000-279113

Conventional packaging materials for rice balls were made entirely of plastic film. However, after use, plastic containers must be disposed of separately from flammable materials. In addition, uncollected plastics leak into the environment, becoming one of the causes of marine pollution, and their negative impact on the ecosystem has become a problem. Therefore, a packaging material for rice balls that uses less plastic is desired.

The food packaging material of Patent Document 3 uses Japanese paper or the like for the outer film. However, the outer film base is made of synthetic resin, and this Japanese paper is further provided on top of the synthetic resin in order to give the packaging a more luxurious feel (paragraph 0004 of the same document). Therefore, the amount of plastic used is not decreasing, and waste is increasing due to the paper or non-woven surface layer.

The rice ball packaging materials of Patent Document 4 and Patent Document 5 use glassine paper for the exterior sheet. However, paper is harder than plastic film and has no directionality, making it difficult to cut. In Patent Document 4 and Patent Document 5, a cut tape or cut thread is provided in the center of the outer sheet, but this makes it difficult to cut the paper without applying considerable force. Glassine paper is not strong enough to be used as a packaging material for rice balls, but if a stronger paper is used, it will be more difficult to open the package. The same applies to the food packaging material of Patent Document 3.

Furthermore, in the food packaging material of Patent Document 3, an outer film having paper and an inner film made of plastic are connected by heat fusion at the side edges (paragraph 0015 of the same document). At this joint, the surface layer of paper and the film base and inner film, which are made of synthetic resin, overlap, but while the surface layer of paper hardly shrinks even when heated during thermal welding, synthetic resin The film base and inner film are shrunk by heating. Due to this difference in contractility, the side edges are deformed such that both sides are warped.

An object of the present invention is to provide a packaging material for rice balls and a packaged rice ball that reduces the amount of plastic used, is easy to open, and has a stable shape.

In order to solve the above-mentioned problems, the packaging material for rice balls of the present invention includes a substantially rectangular outer sheet, an inner sheet that is a plastic sheet connected along the outer periphery of the outer sheet, and a material between the outer sheet and the inner sheet. It has a seaweed sheet stored in the container, an opening area provided along the length in the center of the outer sheet, and a cover sheet covering the opening area provided on the outer surface of the outer sheet. The sheet has a central paper sheet portion and plastic sheet portions connected to both sides of the central portion, and the plastic sheet portions are connected to both sides of the inner sheet. The outer sheet may be provided with a laminate film that covers the entire inner surface of the paper sheet portion and extends to the outside of both edges thereof, and the outer sheet portion may form a plastic sheet portion. The plastic sheet portions of the sheet are connected only near both side edges of the paper sheet portion, and the plastic sheet portion may not be provided at the center of the paper sheet portion. Furthermore, it is preferable that a strip-shaped cutout is provided in the center of the outer sheet along the length direction as an opening area, and a transparent cover sheet is provided to cover the opening area.

Furthermore, the packaged rice ball of the present invention includes a triangular ball of rice wrapped in the above-mentioned rice packaging material, and an opening area and a cover sheet are provided over the two triangular surfaces of the triangular ball of rice and the bottom surface between them.

In this invention, a paper sheet is used as the main material for the outer sheet, which greatly reduces the amount of plastic used and reduces the impact on the environment. An opening area and a cover sheet are provided over the two triangular sides of the triangular rice ball and the bottom surface between them, and the outer sheet can be easily divided into right and left sides when opening the bag. Since the outer sheet and the inner sheet are connected by their plastic surfaces, warping due to differences in shrinkage between the sheets during thermocompression bonding does not occur, and an accurate shape is maintained.

It is a top view which shows the 1st example of the packaging material for rice balls. It is a rear view of the same. It is an AA sectional view of the same. FIG. 2 is a plan view showing a first example of an outer sheet. It is a BB sectional view of the same. It is a top view which shows the 2nd example of an outer sheet. It is a sectional view taken along the line CC. It is a perspective view showing a state where rice balls are placed on a packaging material for rice balls. It is a perspective view showing a packaged rice ball. It is a top view which shows the 3rd example of the packaging material for rice balls. It is a top view which shows the 3rd example of an outer sheet. It is a top view which shows the 4th example of the packaging material for rice balls. It is a top view which shows the 4th example of an outer sheet. It is a top view which shows the 5th example of the packaging material for rice balls. It is a rear view of the same. It is a DD sectional view of the same. It is an enlarged sectional view of the side part. It is a top view which shows the 5th example of an outer sheet. It is a sectional view taken along line EE.

Embodiments for carrying out the invention will be described based on the drawings. FIG. 1 is a plan view showing a first example of a packaging material for rice balls, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along line AA of the same. The packaging material 1 for rice balls includes a substantially rectangular outer sheet 2 which is a paper sheet, an inner sheet 3 connected along the outer periphery of the outer sheet 2, and a seaweed sheet 4 stored between the outer sheet and the inner sheet. and has.

The outer sheet 2 will be explained. FIG. 4 is a plan view showing a first example of the outer sheet, and FIG. 5 is a sectional view taken along line BB. The outer sheet 2 is generally rectangular. It does not need to be completely rectangular; for example, as in this example, there may be cut-off portions at the four corners so that there will be less folding at the four corners when the rice ball is packaged. In this invention, the outer sheet 2 has a paper sheet portion 2a in the center. The paper sheet 2a is not particularly limited as long as it can safely package food and has sufficient strength. Further, in order to obtain a certain degree of waterproofness and surface smoothness, it is preferable to perform surface treatment such as plastic coating on both sides.

Plastic sheet portions 2b are connected to both sides of the paper sheet portion 2a. This plastic sheet portion 2b becomes a portion connected to an inner sheet 3, which will be described later. In the examples shown in FIGS. 4 and 5, the plastic sheet portion 2b of the outer sheet 2 is connected only near both side edges of the inner surface of the paper sheet portion 2a, and the plastic sheet portion 2b is connected to the paper sheet portion 2a at the center of the paper sheet portion 2a. Not provided. Therefore, most of the outer sheet 2 is formed by a paper sheet, and the plastic sheet portion 2b is limited to a narrow range at both end portions. Therefore, the amount of plastic used is significantly reduced. Note that the connection portion between the paper sheet portion 2a and the plastic sheet portion 2b is a laminate of the paper sheet and the plastic sheet, but if the connection is made with an adhesive, shrinkage due to heating will not occur. Further, by using a low-temperature fusion plastic sheet and joining by thermocompression bonding, the shrinkage of the plastic sheet during thermocompression bonding can be reduced, and deformation due to warping can be reduced.

FIG. 6 is a plan view showing a second example of the outer sheet, and FIG. 7 is a sectional view taken along line CC of the same. Also in this example, the outer sheet 2 has a paper sheet portion 2a in the center. Further, the outer sheet 2 is provided with a laminate film that covers the entire inner surface (the lower surface in FIG. 7) of the paper sheet portion 2a and extends to the outside of both side edges thereof. This outwardly extending portion forms the plastic sheet portion in this example. This laminate film also has the function of protecting the paper sheet portion 2a from moisture generated from the rice balls and ingredients when the rice balls are packaged. Lamination of laminates made of polypropylene resin and dry lamination using adhesives are already widespread and established techniques, and can be carried out without causing warping. Although this laminate film covers the entire surface of the outer sheet 2, it is much thinner than the plastic film used in conventional rice ball packaging bags, and the amount of plastic used is reduced.

An opening area 5 is provided along the center line of the outer sheet 2. In this example, a strip-shaped cutout is provided in the center of the outer sheet along the length direction as an opening area 5. Both ends of this band-shaped cutout are semicircular or semielliptical, forming a large elongated hole. Furthermore, at each end, a notch 8 is also provided extending from the center of the cutout to the outside of the opening area 5 .

Next, the inner sheet 3 will be explained. The inner sheet 3 has a substantially elongated shape having the same outer shape as the outer sheet, and is made of a thin plastic film. It is designed to easily separate left and right along the center line. In this example, the left and right sheets are two separate substantially rectangular sheets, which overlap at a predetermined width in the center. Although this overlapping portion may be weakly bonded, it is not connected in this example.

The outer sheet 2 and the inner sheet 3 are connected to each other along both sides. In the present invention, both sides of the outer sheet 2 are plastic sheet parts 2b, and the plastic sheets are joined together. For example, it can be sealed by thermocompression bonding or the like. In this part, all the layers are plastic, so the difference in shrinkage is not large. Therefore, an accurate shape can be obtained without deformation of the edge due to warping. The obtained packaging material for rice balls is flat and does not cause malfunction of the machine even when the rice balls are packaged in an automated machine.

Further, the outer sheet 2 and the inner sheet 3 may also be connected at the edges along the upper and lower sides, which are connected in this example. Since the connection area of this part is small, deformation that would significantly affect the shape is unlikely to occur. A rectangular seaweed sheet 4 for wrapping rice balls is inserted between the outer sheet 2 and the inner sheet 3.

A cover sheet 9 is provided on the opening area 5 on the outer surface of the outer sheet 2 to cover the opening area 5. The cover sheet 9 may be a paper sheet, but in this example a transparent film is used. Therefore, the inner seaweed sheet can be seen through the band-shaped cutout as a window. A grip portion 10 is provided at one end of the cover sheet 9.

Next, an example of a packaged rice ball packaged with the above-mentioned rice ball packaging material will be explained. FIG. 8 is a perspective view showing a state in which rice balls are placed on a rice packaging material. Place the rice packaging material 1 with the side with the inner sheet 3 facing up, and place the triangular rice ball x. Then, while folding the rice packaging material 1 in half along the bottom of the rice ball x, cover the triangular surface of the rice ball x, fold the excess portion at the top, turn it around the back of the rice ball x, and seal it on top. Fix the folded edge by pasting something like this. This wrapping method is not particularly different from the conventional wrapping method for rice balls.

FIG. 8 is a perspective view showing an example of a food packaging material. The rice balls x are separated by an inner sheet 3 and wrapped in a seaweed sheet, and further wrapped in an outer sheet 2 from above. The cover sheet 9 appears on the triangular surface of the rice ball, passes through the bottom surface, and extends to the opposite triangular surface. The grip portion 10 at the upper end of the cover sheet 9 is located at the upper corner of the triangular surface. The interior can be observed using the band-shaped cutout as a window.

I will explain how to open the packaged rice ball. First, pinch the grip portion 10 of the cover sheet 9 with your fingers. Since the knob part 10 is not bonded to the outer sheet 2, it can be easily pinched. Pull this downward to peel off the cover sheet 9 from the outer sheet 2. The cover sheet 9 can be easily peeled off. After the cover sheet 9 is completely removed in this manner, the opening region 5 appears in an open state over both triangular surfaces and the bottom surface of the rice ball. Most of the outer sheet 2 is divided into left and right parts, but a connected part remains only near the upper corner of the rice ball. However, this can also be divided by pulling the remaining food packaging material 1 left and right. There is only a small amount of connection left, and since a notch 8 is provided from the center of the end unsealing line to the outside of the opening area, cracks will propagate from this notch 8 as a starting point, making it hard. Even if it is paper, the remaining parts can be easily separated. In this way, the outer sheet 2 and the inner sheet 3 connected thereto can be removed from the rice ball x. The seaweed sheet 4 remains on the rice ball x, and the rice ball wrapped in nori is obtained.

A third example of the packaging material for rice balls will be explained. FIG. 10 is a plan view showing a third example of a packaging material for rice balls, and FIG. 11 is a plan view showing a third example of an outer sheet. In this example as well, the outer sheet 2 includes a paper sheet section 2a in the center and plastic sheet sections 2b provided on both sides of the paper sheet section 2a. The plastic sheet portion 2b may be provided only on both sides as in the example shown in FIG. 5, or may cover the entire inner surface of the paper sheet portion 2a as shown in FIG. In this example, two parallel opening lines 6 are provided at a predetermined distance along the center line, and the area sandwiched between them becomes the opening area 5. Furthermore, as the unsealing line forming the unsealing area 5, in addition to these two parallel unsealing lines 6, an end unsealing line 7 is provided that connects the upper ends and lower ends of the opening lines. A closed loop surrounding the opening area 5 is formed by the parallel opening line 6 and the end opening line 7. A notch 8 is also provided extending from the center of each end opening line 7 to the outside of the opening area 5. Here, the unsealing line is a line that has been processed to facilitate cutting, and here, perforations are provided in which the cutting portion and the connecting portion are periodically repeated.

In this example, the amount of plastic used is reduced by using a paper sheet as the cover sheet 9. The outer sheet 2 and the cover sheet 9 have a high sealing property and are connected in such a way that they are difficult to peel off during packaging and can be easily removed when unpacking. For example, a pressure-sensitive adhesive such as polyester, acrylic, or rubber may be applied to the cover sheet 9 except for the tabs 10, thereby making the connection possible. In particular, an adhesive reducing treatment area can be provided on the outside of the opening area 5 by applying a coating to make the surface smooth, so that the adhesiveness can be made weaker than on the inside of the opening area 5.

In this example as well, the packaging method is the same as in the first example. The resulting packaged rice ball is almost the same as shown in FIG. 9, but since a paper sheet is used as the cover sheet 9, the inside cannot be seen.

The package is opened by pinching the tab 10 and peeling off the cover sheet 9 from the outer sheet 2. Since the opening area 5 of the outer sheet 2 is adhered to the cover sheet 9, it is pulled away from the outer sheet 2 and cut along the opening line while being attached to the cover sheet 9. After the cover sheet 9 is completely removed in this manner, the opening region 5 appears in an open state over both triangular surfaces and the bottom surface of the rice ball. A connected portion remains only near the upper corner of the rice ball, but it can be separated by pulling the remaining rice packaging material 1 left and right. Since a notch 8 is provided from the center of the end opening line to the outside of the opening area, cracks will propagate from this notch 8 as a starting point, and the remaining paper will be easily separated even if the paper is hard. can.

A fourth example of the packaging material for rice balls will be explained. FIG. 12 is a plan view showing a fourth example of a packaging material for rice balls, and FIG. 13 is a plan view showing a fourth example of an outer sheet. In this fourth example, the opening line 6 is a single line formed on the center line of the outer sheet. The cuts and connections may be formed by periodically repeating perforations, and the cuts may be longer to facilitate opening of the rigid paper sheet. Furthermore, the unsealing line 6 may be connected only at several connecting portions, or may be formed by cutting all of its sections. In this way, by forming the cutting line 6 into a single line, manufacturing can be facilitated.

The cover sheet 9 is pasted onto the opening line 6 from the outside surface of the outer sheet. The cover sheet 9 may be the same as the first example, but since it only covers one opening line 6, it may be thinner as shown in FIG. 13.

In this example, as in the third example, the opening line 6 is completely covered and sealed by the cover sheet 9 from the outside of the outer sheet. Therefore, even if a large cut is provided in the opening line 6, air will not enter or exit through the cut. Further, a cover sheet 9 provided on the outside protects the opening line 6. Even when the rice ball packaging material or the packaged rice ball is handled by hand, the fingers do not touch the opening line 6, and the situation where the package is torn even when the package is not intended to be opened is prevented.

Packaging using the rice ball packaging material in this example may be the same as in the third example. In the obtained packaged rice ball, the opening line and the cover sheet are located across the two triangular sides of the triangular rice ball and the bottom surface between them. When opening the package, the cover sheet 9 is peeled off from the outer sheet 2 by grasping the grip portion of the cover sheet 9 with your fingers and pulling downward. After the cover sheet 9 is completely removed in this way, tear lines appear across both triangular surfaces and the bottom surface of the rice ball. By pulling the remaining rice packaging material 1 left and right, it is completely separated, and the outer sheet 2 and the inner sheet 3 connected thereto can be removed from the rice ball x. The seaweed sheet 4 remains on the rice ball x, and the rice ball wrapped in nori is obtained.

A fifth example of the packaging material for rice balls will be explained. FIG. 14 is a plan view showing a fifth example of the packaging material for rice balls, FIG. 15 is a rear view of the same, FIG. 16 is a sectional view taken along line DD, FIG. 17 is an enlarged sectional view of the side, and FIG. 18 is an outer sheet. A plan view showing the fifth example, and FIG. 19 is a sectional view taken along the line EE. In this example, the paper sheet portion 2a extends to both side edges. A plastic sheet portion 2b having a predetermined width is attached to the inner surface of the paper sheet portion 2a at both side edges. Here, a low temperature heat sealable film is used for the plastic sheet portion 2b. For example, a film using a copolymer with a low melting point that has a sealing temperature of 140° C. or lower may be used. In particular, a material having a melting point lower than that of the plastic sheet portion 2b is suitable. The plastic sheet portion 2b is provided only on both side edges of the paper sheet portion 2a, and is not provided on most of the area along the center line of the paper sheet portion 2a. This reduces the total amount of plastic used. Furthermore, costs are reduced by reducing the amount of relatively expensive low-temperature heat-sealable film used.

The paper sheet portion 2a and the plastic sheet portion 2b may be joined using an adhesive, but may also be low-temperature thermocompression bonding.

The outer sheet 2 and the inner sheet 3 are bonded together by low-temperature thermocompression bonding in this plastic sheet portion 2b. In this portion, the paper sheet portion 2a also overlaps, but since the temperature at the time of pressure bonding is low, the shrinkage of the inner sheet 3 is small, and almost no curling occurs at the connection portion.

1. Packaging material for rice balls 2. Outer sheet 2a. Paper sheet portion 2b. Plastic sheet part 3. Inner sheet 4. Seaweed sheet 5. Opening area6. Opening line 7. End opening line8. Notch part 9. Cover sheet 10. Knob section x. rice ball

Claims (4)

A roughly rectangular outer sheet, an inner sheet that is a plastic sheet connected to the outer sheet, a seaweed sheet stored between the outer sheet and the inner sheet, and a seaweed sheet provided along the length in the center of the outer sheet. and a cover sheet that covers the opening area provided on the outer surface of the outer sheet,
The outer sheet has a paper sheet part in the center and a plastic sheet part connected to both sides of the paper sheet part, and the plastic sheet parts are connected to both sides of the inner sheet.The rice ball packaging material is used to make triangular rice balls. The packaged rice ball is a packaged rice ball, and the packaged rice ball is provided with an opening area and a cover sheet over two triangular sides of the triangular rice ball and the bottom surface between them. In the packaging material for rice balls, the outer sheet is provided with a laminate film that covers the entire inner surface of the paper sheet part and extends to the outside of both edges, and the outwardly extending part forms the plastic sheet part. The packaged rice ball according to claim 1. The packaged rice ball according to claim 1, wherein in the packaging material for rice ball, the plastic sheet portion of the outer sheet is connected only near both side edges of the paper sheet portion, and the plastic sheet portion is not provided in the center of the paper sheet portion. . Any one of claims 1 to 3, wherein in the packaging material for rice balls, a band-shaped cutout is provided along the length direction in the center of the outer sheet as an opening area, and a transparent cover sheet is provided to cover the opening area. A packaged rice ball with crab description.

Images