JP7382161B2 - Food packaging material - Google Patents

Description

The present invention relates to a food packaging material for packaging food.

Food packaging materials for packaging foods such as processed rice foods such as triangular rice balls that have a triangular front shape (mainly an equilateral triangular shape) and are finished in a three-dimensional shape with a predetermined thickness are has an opening strip extending from one longitudinal end to the other; an outer sheet that is divided into a pair of outer sheet pieces by the opening strip; A form in which the inner sheet is composed of a pair of inner sheet pieces having overlapping parts of the inner parts so that the arrangement overlaps with the strip, and the outer sheet and the inner sheet are joined so as to surround the sheet-shaped food. is common.

In this type of food packaging material, there is a concern that moisture from the food may pass between the overlapping parts of the inner sheet pieces and affect the sheet food (if the sheet food is nori, the seaweed may become moist). There are concerns. For this reason, in this type of food packaging material, in order to improve the airtightness of the overlapped part of the inner sheet pieces when used for packaging, a covering piece is provided to cover the overlapped part. In the mating portion, a configuration may be adopted in which the inner side of one inner sheet piece is sandwiched between the inner side of the other inner sheet piece and the covering piece (Patent Document 1).

Here, the food packaging material of Patent Document 1 is made by folding the food in half in the longitudinal direction, folding the excess sheet pieces on both sides to form a bag, and sealing the opening to package the food. (so-called square packaging). In this case, even if there is a covering piece, there is a concern that as the food packaging material is folded in half, the overlapped portions will open locally (separate), creating gaps from which moisture may migrate. be.

However, the unsealing strip whose arrangement overlaps with the overlapping part has a certain degree of rigidity, and by pressing the unsealing strip against the overlapping part, the effect of suppressing the occurrence of gaps can be expected.

This effect becomes more pronounced when there is food behind the overlapped portion, that is, when the overlapped portion is sandwiched between the strip for opening and the surface of the food. In that sense, the packaging form of triangular packaging (so-called triangular packaging), in which the food is sandwiched and folded lengthwise in half, and the extra sheet pieces on both sides are folded toward the center, is more effective than square packaging. Since it is a tightly packed packaging form, it can be expected to be highly effective.

By the way, especially in triangular packaging, due to the tightness of the packaging, in order to improve the ease of opening the food package, the opening strips are arranged in pairs and spaced apart, so that when the food package is opened, , a configuration may be adopted in which a wide dividing opening is formed in the outer sheet by the opening strip (Patent Document 2).

Japanese Patent Application Publication No. 2005-21155 Utility model registration No. 3166506

However, if the strips for opening are arranged at intervals, the strips for opening will come off the overlapping portion of the inner sheet pieces, and the above effect cannot be expected.

Therefore, the present invention has been made in view of the above circumstances, and has the effect of pressing the overlapped portion of the inner sheet pieces by the opening strip to maintain the airtightness of the overlapped portion when the inner sheet pieces are packaged. It is an object of the present invention to provide a food packaging material which can improve the ease of opening the food package by forming a wide dividing opening in the outer sheet by the opening strip when the food package is opened.

The food packaging material according to the first invention includes:
It has a strip for opening from one end to the other in the longitudinal direction, and an outer sheet that is divided into a pair of outer sheet pieces by the strip for opening, and an outer sheet that is overlapped with the outer sheet with the sheet food sandwiched between the inner parts. A food packaging material comprising: an inner sheet composed of a pair of inner sheet pieces having an overlapping portion, and the outer sheet and the inner sheet are joined so as to surround a sheet-shaped food,
The inner sheet is a covering piece that covers the overlapped part, and includes a covering piece that sandwiches the inner side of one inner sheet piece with the inner side of the other inner sheet piece in the overlapped part,
The opening strips are a pair of opening strips that are wavy from one end to the other end in the longitudinal direction of the outer sheet and intersect with each other;
The pair of unsealing strips has a wide portion that overlaps the overlapped portion and is formed by the intersection of the waveforms, and has a wider width than the overlapped portion ,
The covering piece has a side edge opposite to a side edge on the overlapping part side located outside a line of 1/2 the width of the sheet food and further than the side joint of the outer sheet and the inner sheet. It has a width that makes it appear to be located on the inside.
It is a food packaging material.

The food packaging material according to the second invention includes:
It has a strip for opening from one end to the other in the longitudinal direction, and an outer sheet that is divided into a pair of outer sheet pieces by the strip for opening, and an outer sheet that is overlapped with the outer sheet with the sheet food sandwiched between the inner parts. A food packaging material comprising: an inner sheet composed of a pair of inner sheet pieces having an overlapping portion, and the outer sheet and the inner sheet are joined so as to surround a sheet-shaped food,
The inner sheet is a covering piece that covers the overlapped part, and includes a covering piece that sandwiches the inner side of one inner sheet piece with the inner side of the other inner sheet piece in the overlapped part,
The opening strips are a pair of opening strips that are wavy from one end to the other end in the longitudinal direction of the outer sheet and intersect with each other;
The pair of opening strips overlaps the overlapping part and intersects at two places, so that they extend from one end in the longitudinal direction of the outer sheet to the other end with the same width as the overlapping part or the same width as the overlapping part. a first wide part having a maximum width smaller than the width; and a second wide part having a maximum width longer than the first wide part in the longitudinal direction and larger than the width of the overlapping part ,
The maximum width of the second wide part is set to be in the range of 110% or more and 150% or less of the width of the overlapping part.
It is a food packaging material.

Further, as an embodiment of the food packaging material according to the first and second aspects of the present invention,
By sandwiching the food and folding it in half in the longitudinal direction and folding the excess sheet pieces on both sides toward the center, it is possible to adopt a configuration in which the food is packaged in a triangular shape.

As described above, according to the food packaging material of the present invention, when the food packaging material is used for packaging, the opening strip has the effect of pressing the overlapped portion of the inner sheet pieces, thereby improving the airtightness of the overlapped portion. At the same time, when the food package is opened, the dividing opening of the outer sheet by the opening strip can be formed to be wide, thereby improving the opening performance.

FIG. 1 is an exploded perspective view of a food packaging material according to an embodiment of the present invention. FIG. 2 is an external view of the food packaging material. FIG. 3 is an inner view of the food packaging material. 4(a) is a sectional view taken along line AA in FIG. 2, FIG. 4(b) is a sectional view taken along line BB in FIG. 2, and FIG. 4(c) is a sectional view taken along line BB in FIG. It is an enlarged view of part C. FIGS. 5A to 5C are perspective views of the process of packaging food using the same food packaging material. 6(a) to 6(c) are perspective views continued from FIG. 5. FIG. FIG. 7(a) is a front view of a food package packaged with the food packaging material, and FIG. 7(b) is a rear view of the food package. FIGS. 8(a) to 8(d) are perspective views of the process of opening the food package. FIGS. 9(a) to 9(d) are enlarged sectional views of main parts in the process of opening the food package. FIG. 10(a) is a cross-sectional view of a food packaging material according to another embodiment, taken along line BB in FIG. 2, and FIG. 10(b) is an enlarged view of section C in FIG. 10(a). It is. FIG. 11 is an external view of the food packaging material according to another embodiment. FIG. 12 is an inner view of the food packaging material. FIG. 13 is a perspective view of a food package packaged with the same food packaging material.

EMBODIMENT OF THE INVENTION Hereinafter, as one embodiment of the present invention, a food packaging material used for packaging triangular rice balls and a food packaging body packaged with this food packaging material will be described with reference to FIGS. 1 to 9.

As shown in FIGS. 1 to 3, the food packaging material 1 according to the present embodiment has a pair of sheets (outer sheet 2, inner sheet 3) each having a shape that is longer than the other in a direction perpendicular to each other. They are overlapped with a sheet-like food 4 such as seaweed wrapped around a rice ball sandwiched between them, so as to surround the sheet-like food 4, and the end joints 11, 11 on one longitudinal end 10a side and the other end 10b side, and the side portions on both sides. It includes a main body 10 sealed on all sides by joints 12, 12. Note that, hereinafter, one of the directions (the vertical direction in FIGS. 2 and 3) will be referred to as the "longitudinal direction", and the other direction (the horizontal direction in FIGS. 2 and 3) will be referred to as the "width direction".

The outer sheet 2 is made of a heat-fusible plastic sheet such as polyethylene or polypropylene, and has a rectangular shape (rectangular shape) large enough to enclose food when folded in half in the longitudinal direction.

A pair of score lines 20, 20 are formed at one end 10a of the outer sheet 2, spaced apart from each other at a predetermined interval in the width direction. The cut line 20 is formed by a full cut line, a half cut line, a perforation, or the like. By forming the cut line 20, a knob 21 is formed as an opening point. A band-shaped or linear opening strip 22 is provided on the inner surface of the outer sheet 2 from the knob 21 to the other end 10b of the outer sheet 2. By pulling down the knob 21, the opening strip 22 breaks the outer sheet 2 at a predetermined width, and the outer sheet 2 can be separated (divided) in the width direction (left and right). In this embodiment, the opening strip 22 is arranged at the center of the outer sheet 2 in the width direction.

A pair of opening strips 22 are provided. The pair of opening strips 22, 22 are arranged in the longitudinal direction (in this embodiment, the center line in the width direction of the outer sheet 2) so that two waves are formed from one end 10a of the outer sheet 2 to the other end 10b. ) is attached to the outer sheet 2 over its entire length in a meandering shape. The pair of unsealing strips 22, 22 are provided line-symmetrically with respect to the longitudinal direction, so that they intersect at two points from one end 10a to the other end 10b of the outer sheet 2, and intersect at a first intersection 22a and a second intersection. An intersection point 22b is provided. Further, a first wide portion 22c is formed between the one end 10a and the first intersection 22a, and a second wide portion 22d is formed between the first intersection 22a and the second intersection 22b. In this embodiment, the pair of opening strips 22, 22 are attached to the outer sheet 2 so that two waves, a small wave and a large wave, are formed from one end 10a of the outer sheet 2 to the other end 10b. As a result, the second wide portion 22d is wider and longer in the longitudinal direction than the first wide portion 22c.

The unsealing strip 22 is made of, for example, cut tape, thread, or the like having a strength capable of tearing the outer sheet 2. In this embodiment, the opening strip 22 is a cut tape. The cut tape 22 is made by thinly cutting a heat-fusible plastic sheet such as biaxially oriented polyester, polyethylene terephthalate (PET), polyethylene (PE), or polypropylene (PP). In this embodiment, the cut tape 22 has a thickness that is approximately the same as the thickness of the outer sheet 2 (10 μm or more, or 20 μm or more, and 30 μm or less, or 40 μm). Further, the cut tape 22 has a width of 1.5 mm or more, or 2 mm or more, and 4 mm or less, or 3 mm or less.

4(a) is a cross-sectional view taken along line AA in FIG. 2, which crosses the maximum width of the first wide portion 22c, and FIG. 4(b) is a cross-sectional view of FIG. 2, which crosses the maximum width of the second wide portion 22d. 4(c) is an enlarged view of section B in FIG. 4(b). As shown in FIG. 4, the inner sheet 3, like the outer sheet 2, is made of a heat-weldable plastic sheet such as polyethylene or polypropylene, and has a rectangular shape that is large enough to wrap food when folded in half in the longitudinal direction. (rectangular shape). The inner sheet 3 includes a pair of inner sheet pieces (a first inner sheet piece 30 and a second inner sheet piece 31) whose inner sides are overlapped with each other along the longitudinal direction, and the inner sheet pieces 30 and 31 The size of the superposed state of 30a and 31a is the same as that of the outer sheet 2. In this embodiment, the overlapping part 32 of the inner side parts 30a, 31a of the inner sheet pieces 30, 31 is arranged at the center in the width direction of the inner sheet 3, and the arrangement overlaps with the opening strips 22, 22. .

The first inner sheet piece 30 has a rectangular shape (rectangular shape) long in the longitudinal direction. The first inner sheet piece 30 is attached to one side of the outer sheet 2 in the width direction (in this embodiment, the food packaging material 1 is placed in front with one end 10a of the food packaging material 1 facing up and the other end 10b facing down). located on the right side when viewed from the outside). The second inner sheet piece 31 has a rectangular shape (rectangular shape) long in the longitudinal direction. The second inner sheet piece 31 is arranged on the other side of the outer sheet 2 in the width direction (in this embodiment, on the left side when the food packaging material 1 is viewed from the front (outer surface)). The overlapping part 32 is constituted by overlapping the inner side part 30a of the first inner sheet piece 30 and the inner side part 31a of the second inner sheet piece 31, and is formed over the entire area from one end 10a of the inner sheet 3 to the other end 10b. Ru. In this embodiment, the inner side 30a of the first inner sheet piece 30 is superimposed on the inner side 31a (outer surface) of the second inner sheet piece 31. Therefore, the inner side 31a of the second inner sheet piece 31 is in contact with the sheet-like food 4, whereas the inner side 30a of the first inner sheet piece 30 is between the second inner sheet piece 31 and the sheet-like food 4. The inner part 31a of 31 is interposed and does not come into contact with the sheet-shaped food product 4.

The width of the overlapping part 32 is the same as or larger than the width of the first wide part 22c of the strips for opening 22, 22, and the width of the second wide part 22d of the strips for opening 22, 22 is larger than the width of the first wide part 22c. smaller than the width of . In other words, the width of the first wide portion 22c is the same as or smaller than the width of the overlapping portion 32, and the width of the second wide portion 22d is greater than the width of the overlapping portion 32. As a result, the maximum width portion of each opening strip 22 (the maximum width portion of the second wide portion 22d) protrudes from the overlapping portion 32 in the width direction, and the inner sheet 3 is wider than the side edge of the overlapping portion 32. Located on the side edge.

The larger the maximum width of the second wide portion 22d, the wider the opening can be made. However, as the maximum width of the second wide portion 22d increases, the portion that overlaps with the overlapping portion 32 decreases, and the effect of pressing the overlapping portion 22 by the unsealing strips 22, 22 is reduced. Therefore, the maximum width of the second wide portion 22d is set to be in the range of 110% or more, or 120% or more, and 150% or less, or 140% or less, or 130% or less of the width of the overlapped portion 32. is set. As an example, the width of the overlapping portion 32 is 20 mm, while the maximum width of the opening strips 22, 22 is 25 mm.

The inner sheet 3 further includes a covering piece 33 that covers the inner side portion 30a of the first inner sheet piece 30. Like the inner sheet pieces 30 and 31, the covering piece 33 is made of a heat-weldable plastic sheet such as polyethylene or polypropylene, and has a predetermined width in the width direction of the inner sheet 3 and extends in the longitudinal direction of the inner sheet 3. It is a long strip along the length. The covering piece 33 has a length spanning the entire area from one end 10a to the other end 10b of the inner sheet 3, and the inner side portion 33a of the covering piece 33 extends over the entire area from the one end 10a to the other end 10b of the inner sheet 3. It is arranged so as to cover the inner part 30a of 30. As a result, the inner side 30a of the first inner sheet piece 30 is inserted between the inner side 31a of the second inner sheet piece 31 and the inner side 33a of the covering piece 33, and the inner side of the second inner sheet piece 31 is inserted. 31a, the inner side 30a of the first inner sheet piece 30, and the inner side 33a of the covering piece 33, forming a labyrinth structure. In this embodiment, the covering piece 33 is arranged so that the side edge of the inner side part 33a matches the side edge of the inner side part 31a of the second inner sheet piece 31, and thereby the inner side of the second inner sheet piece 31 The side edge of the portion 31a and the side edge of the inner side portion 33a of the covering piece 33 are aligned.

The covering piece 33 has a side edge of the outer portion 33b (that is, a side edge on the side opposite to the side edge on the side of the overlapped portion 32) line L1 having a width of 1/2 of the width of the sheet-shaped food 4 (that is, a sheet-shaped food product 4). A line located closer to the side edge of the inner sheet 3 than the center line CL in the width direction of the food 4 and the side edge of the sheet food 4, and furthermore, a line with a width of 2/3 of the width of the sheet food 4. It is located closer to the side edge of the inner sheet 3 than L2 and is wide enough to be located near the side edge of the sheet-shaped food product 4. In this embodiment, the width of the sheet-shaped food product 4 is 90 mm, while the width of the covering piece 33 is 50 mm.

The covering piece 33 is joined to the second inner sheet piece 31 on the outer side 33b side. The covering piece 33 is narrower than the second inner sheet piece 31, and is located inside the side joint part 12 of the second inner sheet piece 31 (that is, the area corresponding to the housing part for the sheet food 4). is joined to. The joint portion 34 is formed by heat-sealing the second inner sheet piece 31 and the covering piece 33 along the side edge of the outer part 33b of the covering piece 33. In this embodiment, the joint 34 is a line seal having a width of 5 mm to 15 mm.

The joint portion 34 is formed along the side edge of the outer portion 33b of the covering piece 33, and is formed at a position inside the side edge of the outer portion 33b of the covering piece 33. Thereby, the portion from the side edge of the outer portion 33b of the covering piece 33 to the joint portion 34 is an extremely thin free piece 33c that is a non-joint portion. If a non-joining part is not provided or the width of the free piece 33c is small, there is a risk that the joining means will step over the side edge of the outer part 33b of the covering piece 33 due to the influence of the precision of the manufacturing equipment, and in this case There is a concern that the portion of the second inner sheet piece 31 that has been stepped over may be damaged by heat and become defective. On the other hand, if the width of the free piece 33c is large, there is a risk that the free piece 33c will get caught on the food when the food package is opened, resulting in poor opening. Therefore, the width of the free piece 33c is set to be in a range of 1 mm or more, or 2 mm or more, and 7 mm or less, or 6 mm or less.

Note that the inner sheet pieces 30, 31 and the covering piece 33 are matte sheets that have been subjected to a matte treatment in order to obtain slipperiness with the triangular rice balls and sheet-shaped foods 4 that are the packaged items. Alternatively, only the covering piece 33 may be a matte sheet. Furthermore, if the packaged item or the sheet-shaped food 4 contains oil and there is no problem with slipperiness, the mat sheet may not be used.

As shown in FIGS. 2 and 3, the end joint portion 11 extends along one end 10a and the other end 10b of the outer sheet 2 and the inner sheet 3, excluding the overlapping portion 32 of the inner sheet pieces 30 and 31. It is formed by heat-sealing the inner sheet 3 and the inner sheet 3. The side joint portion 12 is formed by heat-sealing the outer sheet 2 and the inner sheet 3 along the side edges of the outer sheet 2 and the inner sheet 3. The interior of the main body 10 configured in this manner serves as a housing section for the sheet-shaped food product 4. In the present embodiment, each of the end joints 11 extends along one end 10a and the other end 10b, and has a plurality of parallel parts arranged at predetermined intervals in the longitudinal direction of the outer sheet 2 and the inner sheet 3. Consists of linear (multiple) joints. In addition, communication portions 12a are provided in the side joint portion 12 at appropriate intervals in the longitudinal direction so as to allow ventilation in the width direction, and the side joint portion 12 is divided into a plurality of portions by the communication portions 12a. .

Notches 13 are formed at the four corners of the food packaging material 1 (main body 10). The cutout portion 13 is formed by eliminating some of the excess sheet pieces on both sides when packaging food using the food packaging material 1, thereby folding the excess sheet pieces on both sides toward the center. This is to reduce the overlap of the sheet pieces when forming the triangular shape.

From the intersection of the notch 13 and the side edge of the food packaging material 1 to a predetermined range of the side edge of the food packaging material 1, a serrated easily breakable portion 14 is formed along the side edge of the food packaging material 1. It is formed. That is, easy-to-break portions 14 are formed adjacent to the cutout portions 13 on both sides of the food packaging material 1 on the one end 10a side. The easy-to-break part 14 is provided corresponding to each opening strip 22, and is for making it easy to break the food packaging material 1 in the width direction from the easy-to-break part 14.

On the front (outer surface) of the food packaging material 1, display sections 26 regarding the order of opening operations, which will be described later, are provided at locations corresponding to the three corners of the triangular rice ball packaged into a triangular shape. The display section 26 includes a first display section 26a, a second display section 26b, and a third display section 26c. The first display part 26a is provided on the knob 21 (that is, a location corresponding to the apex corner of the triangle), and indicates that the opening operation is first and that the knob 21 is pulled downward. The second display section 26b is provided at a location on the right side of the center in the longitudinal direction of the food packaging material 1 (that is, a location corresponding to the right corner of the triangle), and indicates that the opening operation is the second one. Represents pulling to the right. The third display section 26c is provided at a location on the left side of the center in the longitudinal direction of the food packaging material 1 (that is, a location corresponding to the left corner of the triangle), and indicates that the opening operation is the third one and Represents pulling to the left. In this embodiment, the display section 26 is provided by printing on the outer surface of the outer sheet 2.

The food packaging material 1 according to the present embodiment has the above configuration. Next, a method of packaging food using this food packaging material 1 will be described.

First, as shown in FIG. 5(a), a triangular rice ball 5 is placed on the inner sheet 3 of the food packaging material 1. At this time, the triangular rice balls 5 are placed evenly on the left and right sides on the inner sheet pieces 30 and 31, and one corner (apex corner) of the triangular rice balls 5 is placed on the knob 21 on the one end 10a side of the food packaging material 1. Arrange the triangular rice balls 5 so that they face each other. Note that the width of the triangular rice ball 5 is approximately the same as the width of the sheet-shaped food product 4.

Next, as shown in FIG. 2(b), the food packaging material 1 is folded in half in the longitudinal direction so that the one end 10a side and the opposite end 10b side are aligned, and the folded side is shaped like a triangle. Fold it along the side of rice ball 5 (triangular slope). As a result, one half of the food packaging material 1 in the longitudinal direction on the one end 10a side covers the front side of the triangular rice ball 5, and the other end 10b side half covers the back side of the triangular rice ball 5, and both sides (left and right) of the food packaging material 1 The sheet pieces 15, 15 remain in a state where one end 10a and the other end 10b of the food packaging material 1 are misaligned.

Therefore, as shown in Figure (c), the excess sheet piece 15 on either side is folded and placed over the part of the food packaging material 1 that covers the back of the triangular rice ball 5, and then Next, as shown in FIG. 6(a), the other excess sheet piece 15 is folded and placed over the portion of the food packaging material 1 that covers the back side of the triangular rice ball 5 to form a triangular shape.

At this time, flattened tabs 16 are formed at each corner of the triangular shape by overlapping extra sheets of the food packaging material 1 (consisting of a plurality of sheets 2, 30, 31). Ru.

Then, as shown in FIG. 2B, the portions of the extra sheet pieces 15 on both sides that do not overlap each other due to the notch 13 are covered with the back surface of the triangular rice ball 5 of the food packaging material 1. The food packaging material 1 is fixed in a state where the triangular rice ball 5 is wrapped around the food packaging material 1 by joining with a point seal or the like (joint portion 17). Then, as shown in FIG. 6(c), a label 6 is attached thereon. Note that the shape of the joint is not limited to the circular shape as shown in the figure, but can be various shapes such as an ellipse, an ellipse, a polygon, a line, and the number of joints is limited to two. First, there may be three or more joints, or there may be one large joint that is long in the width direction.

As a result, the food package is completed as shown in FIG. 7. In the food package, a first display section 26a is arranged at the top corner, a second display section 26b is arranged at the right corner, and a third display section 26c is arranged at the left corner.

Further, the first intersection 22a of the opening strips 22, 22 is arranged on the front side of the food package, and the second intersection 22b of the opening strips 22, 22 is located on the back side of the food package. It is located in the opening end point area by the body 22,22. That is, the first wide portion 22c of the opening strips 22, 22 is arranged from the opening starting point (one end 10a of the food packaging material 1) of the opening strips 22, 22 to mainly the central region of the front surface of the food package. , from there to the opening end point (the other end 10b of the food packaging material 1) of the opening strips 22, 22 in the longitudinal direction of the back surface of the food package, the second wide portion of the opening strips 22, 22. 22d is arranged, and the largest width part of the second wide part 22d is arranged at or near the bottom of the food package corresponding to the base of the triangular shape.

According to this configuration, the knob 21 serving as an opening point has an appropriate width due to the first wide portion 22c that is neither too wide nor too narrow, making it easy to pick. Further, according to this configuration, the width gradually increases from the starting end of the second wide portion 22d to the maximum width portion located in the middle portion, and gradually narrows beyond the maximum width portion to the terminal end. The second wide portion 22d, which is shaped like a triangle, is arranged to correspond to the shape of the food package that widens toward the bottom and narrows as it moves away from the bottom, so it corresponds to the triangular shape of the food package. It is possible to realize a suitable wide opening (wide opening).

When eating the triangular rice ball 5, as shown in FIGS. 8(a) and 8(b), pick the knob 21, pull the knob 21 as shown in the first display part 26a, and release the opening strip 22. , 22 are routed vertically to divide the outer sheet 2 in the longitudinal direction. At this time, since the unsealing strips 22, 22 consist of a pair with a space between them, the dividing opening 23 becomes wide. Further, as a result of being divided, the outer sheet 2 is divided into a first outer sheet piece 24 on the right side and a second outer sheet piece 25 on the left side. The first outer sheet piece 24 is a sheet piece corresponding to the first inner sheet piece 30, and is integrated with the first inner sheet piece 30 via the end joint portion 11 and the side joint portion 12. A divided package piece 18 is constructed. The second outer sheet piece 25 is a sheet piece corresponding to the second inner sheet piece 31, and is integrated with the second inner sheet piece 31 via the end joint portion 11 and the side joint portion 12. A divided package piece 19 is constituted.

Therefore, first, as shown in FIG. 6(c), the first divided package piece 18 is pulled to the right as indicated by the second display part 26b, and the first divided package piece 18 is attached to the triangular rice ball 5 and the sheet-like food. Separate from 4. Next, as shown in FIG. 3(d), the second divided package piece 19 is pulled to the left as indicated by the third display part 26c, and the second divided package piece 19 is attached to the triangular rice ball 5 and the sheet-like food. Separate from 4. Thereby, the triangular rice ball 5 can be taken out in a state where it is integrated with the sheet-shaped food product 4.

In this way, the opening operation order after dividing the outer sheet 2 by the opening strips 22, 22 is to first pull out the first divided package piece 18 on the right, and then to pull out the second divided package piece on the left. The reason why 19 was extracted is as follows.

The triangular rice ball 5 is tightly packaged by triangular packaging. Therefore, as shown in FIG. 9(a), the sheet is composed of three sheet parts: an inner side 30a of the first inner sheet piece 30, an inner side 31a of the second inner sheet piece 31, and an inner side 33a of the covering piece 33. The overlapping portion 32 of the inner sheet 3 is in close contact with the surface of the triangular rice ball 5 and the sheet-shaped food product 4 over its entire length. Moreover, for this reason, especially in the overlapping portion 32, the frictional force between the covering piece 33 and the triangular rice ball 5 and the frictional force between the second inner sheet piece 31 and the sheet-shaped food product 4 are high.

However, as shown in FIG. 2B, when the food package is opened, a wide dividing opening 23 is formed in the outer sheet 2 by the opening strips 22, 22 having a wider portion 22d than the overlapping portion 32. Then, especially in the overlapping portion 32, the tight state is released, the close contact is loosened, and the frictional force is reduced. Moreover, in the first divided package piece 18, the covering piece 33 is interposed between the first inner sheet piece 30 and the triangular rice ball 5, and the first inner sheet piece 30 is at least as thick as the covering piece 33. It is spaced apart from the surface of the triangular rice ball 5 by the same amount. Further, in the first divided package piece 18, a second inner sheet piece 31 is interposed between the first inner sheet piece 30 and the sheet food 4, and the first inner sheet piece 30 The inner sheet piece 31 is spaced apart from the sheet food 4 by the thickness thereof. As a result, the frictional force between the first inner sheet piece 30 and the triangular rice ball 5, the frictional force between the first inner sheet 30 and the sheet food 4, and the frictional force between the first divided package piece 18 and the triangular rice ball 5 are thereby generated. The frictional force between the first divided package piece 18 and the sheet-like food 4 is equal to the frictional force between the covering piece 33 and the triangular rice ball 5, the frictional force between the second inner sheet piece 31 and the sheet-like food 4, and the frictional force between the second inner sheet piece 31 and the sheet-like food 4. It is smaller than the frictional force between the two-part package piece 19 and the triangular rice ball 5 and the friction force between the second split package piece 19 and the sheet-like food product 4. Therefore, it is possible to pull out the first divided package piece 18 more smoothly with less resistance than to pull out the second divided package piece 19 first, as shown in FIG. 3(c). Moreover, the fact that the resistance is small means that the force applied to the triangular rice ball 5 or the sheet-shaped food product 4 in the width direction is small. Therefore, if the first divided package piece 18 is pulled out first, damage such as cracking or chipping of the triangular rice ball 5 or the sheet-shaped food product 4 can be made less likely to occur.

After pulling out the first divided package piece 18, as shown in FIG. Since the inner side 30a of the sheet piece 30 is removed, the thickness of this bifurcated portion becomes thinner. As a result, the frictional force between the covering piece 33 and the triangular rice ball 5, the frictional force between the second inner sheet 31 and the sheet food 4, the frictional force between the second divided package piece 19 and the triangular riceball 5, and the second The frictional force between the divided package piece 19 and the sheet-like food product 4 becomes smaller than before the first divided package piece 18 is pulled out. Therefore, the second divided package piece 19 can also be pulled out smoothly with little resistance. Further, when the second divided package piece 19 is pulled out, damage such as cracking or chipping of the triangular rice ball 5 or the sheet-like food product 4 can be prevented from occurring.

As described above, according to the food packaging material 1 according to the present embodiment, the triangular rice balls 5 are tightly packaged by the triangular packaging. As a result, the overlapping portion 32 of the inner sheet 3 is sandwiched between the triangular rice ball 5 and the outer sheet 2 over its entire length, and is sealed over its entire length. In addition, the overlapping portion 32 overlaps the opening strips 22, 22 of the outer sheet 2 in many parts and is pressed down by the opening strips 22, 22. Thereby, the airtightness of the overlapping portion 32 is suitably maintained. Therefore, according to the food packaging material 1 according to the present embodiment, the airtightness of the overlapping portion 32 can be improved in a state where it is used for packaging.

Further, according to the food packaging material 1 according to the present embodiment, the opening strips 22, 22 have the second wide portion 22d wider than the overlapping portion 32, and when the food package is opened, A wide dividing opening 23 can be formed in the outer sheet 2 by the strips 22, 22. Thereby, the area of the first outer sheet piece 24 and the second outer sheet piece 25 becomes smaller, and the frictional force with the sheet-shaped food product 4 becomes smaller. Therefore, according to the food packaging material 1 according to the present embodiment, the unsealability of the food package can be improved.

Moreover, according to the food packaging material 1 according to the present embodiment, by opening the first divided package piece 18 and the second divided package piece 19 in this order, both can be pulled out smoothly with little resistance. I can do it. Furthermore, a display section 26 (26b, 26c) that can be checked from the outside is provided so that the person opening the food package can recognize the order of opening operations. Therefore, this also makes it possible to improve the ease of opening the food package.

Moreover, according to the food packaging material 1 according to the present embodiment, the strips 22, 22 for opening have the second wide portion 22d wider than the overlapped portion 32, and the strips 22, 22 for opening The entire portion is not located at the overlapping portion 32. If the opening strip is linear, the entire opening strip will be located at the overlapping part, so the food packaging material will not only have the thickness of the overlapping part, but also the thickness of one or two opening strips. Depending on the thickness of the body, the thickness of the central portion in the width direction increases, and the rigidity of the central portion in the width direction increases. In this case, during packaging, the food packaging material tends to shift to either the left or right in the width direction, and there is a risk that the food packaging material will not be suitable, such as poor opening performance and poor appearance. However, according to the food packaging material 1 according to the present embodiment, the thickness of the central portion in the width direction is dispersed by the wide portion 22d, and the smoothness of the food packaging material 1 is improved. Therefore, according to the food packaging material 1 according to the present embodiment, it is possible to prevent left and right shifting during packaging, and the triangular rice balls 5 can be packaged neatly.

Moreover, according to the food packaging material 1 according to this embodiment, the covering piece 33 is formed wide as shown in FIG. The number of inner sheets 3 is three (overlapping part 32) and two (second inner sheet piece 31 and covering piece 33) from the center in the width direction (center line CL) to the side edge of food packaging material 1. , and gradually decreases to one sheet (second inner sheet piece 31), but if the width of the covering piece 33 is narrow, the step from three sheets to two sheets and the step from two sheets to one sheet are close to each other, resulting in a large step. This causes damage such as cracking or chipping of the sheet food 4 during packaging or opening of the food package. However, according to the food packaging material 1 according to the present embodiment, since the covering pieces 33 are wide, the number of covering pieces 33 decreases gradually, and a large step does not occur. Therefore, according to the food packaging material 1 according to the present embodiment, damage such as cracking or chipping of the sheet-like food product 4 can be made less likely to occur during packaging or when the food package is opened.

Moreover, according to the food packaging material 1 according to the present embodiment, the one end side and the other end side in the longitudinal direction of the covering piece 33 are connected to the outer sheet 2 and the inner sheet 3 (end joint 11), the second inner sheet piece 31 is joined to one end side and the other end side in the longitudinal direction along the one end side and the other end side. Thereby, it is possible to seal between the second inner sheet piece 31 and the covering piece 33 at the one end 10a side and the other end 10b in the longitudinal direction. Note that the reason why the end joint portion 11 is not provided in the overlapping portion 32 is to prevent the first divided package piece 18 and the second divided package piece 19 from being fixed together by the end joint portion 11. However, if the first divided package piece 18 and the second divided package piece 19 can be separated when the food package is opened, the end joining part 11 may also be provided in the overlapping part 32.

Note that the food packaging material according to the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention.

For example, in the above embodiment, the overlapping part 32 of the inner sheet 2 is such that the inner side 30a of the first inner sheet piece 30 is overlapped on the inner side 31a (outer surface) of the second inner sheet piece 31, and , the inner side 33a of the covering piece 33 is superimposed on the inner side 30a (outer surface) of the first inner sheet piece 30. However, the present invention is not limited thereto. As shown in FIG. 10, the covering piece 33 is arranged on the inner surface side of the second inner sheet piece 31, and is placed on the inner side of the second inner sheet piece 31 on the inner side 30a (outer surface) of the first inner sheet piece 30. 31 a may be overlapped, and the inner side 33 a of the covering piece 33 may be overlapped below (inner surface) the inner side 30 a of the first inner sheet piece 30 .

Further, in the above embodiment, the first divided package piece 18 that is first in the order of opening operation is on the right side when looking from the front of the food package, and the second divided package piece 19 that is later in the order of opening operation is on the right side when viewing the food package from the front. It is configured to be on the left side when viewed from the front. However, the present invention is not limited thereto. The left and right sides are reversed, and the first divided package piece 18 whose opening operation is first is on the left side when looking from the front of the food package, and the second divided package piece 19 whose opening operation is later is on the left side when looking from the front of the food package. It may be configured to be on the right side.

Further, in the embodiment described above, the display section 26 has the above-described design and is arranged at each corner of the triangular shape of the food package. However, the present invention is not limited thereto. If the person opening the food package can recognize that the first divided package piece 18 is to be opened before the second divided package piece 19, the design and position of the display part are particularly limited. It's not a thing.

In the above embodiment, the opening operation order is such that the first divided package piece 18, which is the divided package piece on the side where the covering piece 33 is not provided, is first opened, and then the divided package piece on the side where the covering piece 33 is provided. The second divided package piece 19 is the latter. However, the present invention is not limited thereto. As long as there is no problem in the unsealability of the food package, the opening operation order may be such that the second divided package piece 19 comes first and the first divided package piece 18 comes after.

In the above embodiment, one covering piece 33 is provided only for the second inner sheet piece 31, and the inner side 30a of the first inner sheet piece 30 is connected to the inner side 31a of the second inner sheet piece 31. It is inserted between the forked part of the covering piece 33 and the inner part 33a. However, the present invention is not limited thereto. For example, another cover piece is provided also for the first inner sheet piece 30, and the inner side 30a of the first inner sheet piece 30 is connected to the inner side 31a of the second inner sheet piece 31 and the inner side of the cover piece 33. 33a, and the inner side 31a of the second inner sheet piece 31 is inserted between the inner side 30a of the first inner sheet piece 30 and the inner side of the new covering piece. It is also possible to do so. Alternatively, the inner side 30a of the first inner sheet piece 30 is inserted between the fork part of the inner side 31a of the second inner sheet piece 31 and the inner side 33a of the covering piece 33, and the inner side 33a of the covering piece 33 may be inserted between the bifurcated portion of the inner side 30a of the first inner sheet piece 30 and the inner side of the new covering piece. Thereby, the labyrinth structure becomes more complicated, and the airtightness of the overlapping portion 32 can be further improved.

Further, in the embodiment described above, the covering piece 33 is arranged such that the side edge of the inner side portion 33a matches the side edge of the inner side portion 31a of the second inner sheet piece 31. However, the present invention is not limited thereto. The covering piece 33 may be arranged such that the side edge of the inner side part 33a exceeds the side edge of the inner side part 31a of the second inner sheet piece 31.

Moreover, in the above-mentioned embodiment, the food packaging material 1 is used for triangular packaging for tightly packaging food because, as described above, more excellent effects can be obtained. However, the present invention is not limited thereto. For example, using the food packaging material 1 shown in FIGS. 11 and 12, as shown in FIG. By closing the opening and sealing the opening, it may be used for square packaging for food 5. Alternatively, as described in JP-A No. 2006-264758, by sandwiching the food and folding it in half in the longitudinal direction, overlapping the excess sheet pieces on both sides to form a bag shape, and sealing the opening, It may also be used for square packaging for food products. In addition, in the food packaging material 1 for square packaging, the notch 13 is eliminated, and since the length is required to form a bag-shaped opening, the length in the longitudinal direction is longer than that of the food packaging material 1 for triangular packaging. The one end 10a side and the other end 10b side are formed long.

In addition, shapes such as ``triangular'', ``rectangular'', ``rectangular'', ``center'', ``edge'', ``side'', ``equal'', ``coincident'', ``parallel'', and ``perpendicular'', In the present invention, terms specifying a site or condition include not only the site itself but also the concept of ``substantially'' meaning close to or similar to the site or condition.

Further, in the above embodiment, the food was a triangular rice ball (processed cooked rice food), and the sheet-like food was seaweed. However, the food may be a rice ball, sushi, sandwich, etc. in a shape other than a triangle as long as it can be packaged with a food packaging material, and the type and shape of the food are not limited. The sheet-shaped food may also be a sheet-shaped kelp, tatami sardine, etc., as long as it can be accommodated in the planar storage part of the food packaging material, and the type and shape of the sheet-shaped food are not limited.

Moreover, the sheet used for the food packaging material is not limited to a plastic sheet. For example, it may be a sheet of other material such as paper or a paper-based sheet. Further, instead of a sheet made of a single material, it may be a laminated sheet made of sheets made of a plurality of materials. In addition, sheets can be made by, for example, making one sheet by joining two sheets together at their ends, or making one sheet by joining three sheets one after another at their ends. , a single sheet may be formed using a plurality of sheets. Further, in this case, the materials of each sheet may be different. For example, some of the sheets may be paper or paper-based sheets instead of plastic sheets.

DESCRIPTION OF SYMBOLS 1... Food packaging material, 10... Main body, 10a... One end, 10b... Other end, 11... End joint part, 12... Side joint part, 12a... Communication part, 13... Notch part, 14... Easily breakable part, DESCRIPTION OF SYMBOLS 15... Extra sheet piece, 16... Ledge piece, 17... Joint part, 18... First divided package piece, 19... Second divided package piece, 2... Outer sheet, 20... Cut line, 21... Knob part , 22... strip for opening, 22a... first intersection (end of first wide part 22c, starting end of second wide part 22d), 22b... second intersection (end of second wide part 22d), 22c... first Wide part, 22d... Second wide part, 23... Division opening, 24... First outer sheet piece, 25... Second outer sheet piece, 26... Display part, 26a... First display part, 26b... Second display part, 26c...Third display part, 3...Inner sheet, 30...First inner sheet piece, 30a...Inner side part, 31...Second inner sheet piece, 31a...Inner part, 32...Overlapping part, 33...Covering piece, 33a ...inner part, 33b...outer part, 33c...free piece, 34...joint part, 4...sheet-shaped food, 5...triangular rice ball, 6...label, CL...center line, L1...1/1/of the width of sheet-shaped food 4 2 width line, L2...line 2/3 width of sheet food 4

Claims (3)

It has a strip for opening from one end to the other in the longitudinal direction, and an outer sheet that is divided into a pair of outer sheet pieces by the strip for opening, and an outer sheet that is overlapped with the outer sheet with the sheet food sandwiched between the inner parts. A food packaging material comprising: an inner sheet composed of a pair of inner sheet pieces having an overlapping portion, and the outer sheet and the inner sheet are joined so as to surround a sheet-shaped food,
The inner sheet is a covering piece that covers the overlapped part, and includes a covering piece that sandwiches the inner side of one inner sheet piece with the inner side of the other inner sheet piece in the overlapped part,
The opening strips are a pair of opening strips that are wavy from one end to the other end in the longitudinal direction of the outer sheet and intersect with each other;
The pair of unsealing strips has a wide portion that overlaps the overlapped portion and is formed by the intersection of the waveforms, and has a wider width than the overlapped portion,
The covering piece has a side edge opposite to a side edge on the overlapping part side located outside a line of 1/2 the width of the sheet food and further than the side joint of the outer sheet and the inner sheet. Food packaging material with a width that is positioned on the inside. It has a strip for opening from one end to the other in the longitudinal direction, and an outer sheet that is divided into a pair of outer sheet pieces by the strip for opening, and an outer sheet that is overlapped with the outer sheet with the sheet food sandwiched between the inner parts. A food packaging material comprising: an inner sheet composed of a pair of inner sheet pieces having an overlapping portion, and the outer sheet and the inner sheet are joined so as to surround a sheet-shaped food,
The inner sheet is a covering piece that covers the overlapped part, and includes a covering piece that sandwiches the inner side of one inner sheet piece with the inner side of the other inner sheet piece in the overlapped part,
The opening strips are a pair of opening strips that are wavy from one end to the other end in the longitudinal direction of the outer sheet and intersect with each other;
The pair of opening strips overlaps the overlapping part and intersects at two places, so that they extend from one end in the longitudinal direction of the outer sheet to the other end with the same width as the overlapping part or the same width as the overlapping part. a first wide part having a maximum width smaller than the width; and a second wide part having a maximum width longer than the first wide part in the longitudinal direction and larger than the width of the overlapping part ,
The maximum width of the second wide part is set to be in the range of 110% or more and 150% or less of the width of the overlapping part.
Food packaging materials. The packaging material for food according to claim 1 or 2 , wherein the food is packaged in a triangular shape by sandwiching the food and folding it in half in the longitudinal direction and folding the excess sheet pieces on both sides toward the center.

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