JP7783208B2 - packaging bag - Google Patents

Description

The present invention relates to a packaging bag suitable for packaging food that can be heated using a heating means such as a microwave oven.

To heat food stored in a packaging bag, it is common to place the packaging in a microwave oven. However, when the packaging is heated in a microwave oven, the inside of the packaging bag fills with steam, causing the entire bag to become very hot, making it difficult to hold and remove from the microwave.

The packaging bag described in Patent Document 1 attempts to solve this problem by forming a wide heat-sealed portion at the top of the packaging bag and attaching a gripping point marking to one of the left or right corners. The wide heat-sealed portion does not become very hot even when heated, so by holding the gripping point marking, the bag is not hot and is easy to hold.

Utility Model Registration No. 3047708

However, in the above-mentioned packaging bag, the opening notch is formed below the wide heat-sealed portion, so in order to open the packaging bag, the part of the packaging bag below the notch that is hot must be grasped. As a result, the above-mentioned packaging bag can be easily grasped after heating, but is difficult to open, which remains a problem.

The present invention was developed in light of these circumstances, and aims to provide a packaging bag that is easy to hold and open even when heated.

The packaging bag according to the present invention comprises:
By forming an isolating joint portion so as to surround one corner or two adjacent corners of the bag body made of a sheet, a storage portion that stores contents and a non-storage portion that does not store contents are separated so that gas cannot pass between them,
the isolating joint has a bonding strength that does not peel off even when the internal pressure in the container increases due to heating in a microwave oven ,
The non-storage portion is formed to a size that can be held and has an opening starting point,
This is a packaging bag in which a planned opening line is set from the opening start point across the isolating joint to the storage section.

Also, in this case,
A configuration can be adopted in which an isolating joint is formed so as to surround one corner of the bag body, so that the non-container portion is formed at the corner of the bag body.

Also, in this case,
The non-storage portion can be configured such that the outer periphery is sealed by a joint that seals the opening edge on one end side of the bag body, a folded portion of the sheet at one side edge of the bag body, and an isolating joint.

In addition, as another aspect of the packaging bag according to the present invention,
a separating joint is formed across one end of the bag body, thereby forming a non-container portion at one end of the bag body;
The intended opening line may be set along a direction from one end of the bag body to the other end.

As described above, with the packaging bag of the present invention, even when the package is heated by a heating device such as a microwave oven, the non-containing portion does not become hot, making it easy to hold. Furthermore, since the opening point is located in the non-containing portion, the package can be opened while holding the non-containing portion, eliminating the need to hold the hot portion and making it easy to open.

FIG. 1(a) is a front perspective view of a package packaged in a packaging bag according to a first embodiment of the present invention, and FIG. 1(b) is a rear perspective view of the package package. Figure 2(a) is a front view of the packaging body, Figure 2(b) is a cross-sectional view taken along line A-A in Figure 2(a) when no food is contained therein, and Figure 2(c) is a cross-sectional view taken along line A-A in Figure 2(a). FIG. 3 is an explanatory diagram of the manufacturing process of the package. Figure 4(a) is a perspective view of holding a heated package by holding the non-container portion, and Figure 4(b) is a perspective view of opening the package by holding the non-container portion with one hand and the opening starting point with the other hand. 5(a) to 5(f) are partial front views of packages packaged in packaging bags according to different embodiments. FIG. 6(a) is a front view of a package packaged with a packaging bag according to a second embodiment of the present invention, and FIG. 6(b) is a front view of a package packaged with a packaging bag according to another embodiment. FIG. 7 is an explanatory diagram of the manufacturing process of the package. 8(a) is a front perspective view of the packaging body placed vertically and standing upright, and FIG. 8(b) is a cross-sectional view taken along line BB of FIG. 8(a).

First Embodiment
A packaging bag for use in a microwave oven according to a first embodiment of the present invention will now be described with reference to FIGS. 1 to 4. FIG.

The packaging bag 1 according to this embodiment is in the form of a pillow packaging bag manufactured by a pillow packaging machine. As shown in FIGS. 1 and 2, it is tubular, having a spine 10 formed by joining the edges of a single sheet 1a, and is configured by sealing the opening edge 11 at one end and the opening edge 11 at the other end with a joining section 12. One side edge (upper edge) 13 is not a joining section, but is a folded-back section 14 of the sheet 1a. The other side edge (lower edge) 15 is also not a joining section, but is a folded-back section 16 of the sheet 1a, but is provided with a gusset (bottom gusset) 16a. However, the gusset 16a may not be provided. Alternatively, a gusset may also be provided at the folded-back section 14 of the upper edge 13. As a result, the packaging bag 1 is cylindrical with its edges joined together and a back-sealed portion 10, and consists of a bag body 1A made from a single sheet whose outer edges 11, 11, 13, 15 are sealed by a joining portion 12 or folded portions 14, 16.

The sheet 1a is made of a heat-sealable plastic sheet such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET), and has a rectangular or approximately rectangular shape (rectangular or approximately rectangular) large enough to enclose the food contents F when in a cylindrical shape. In this embodiment, the back lining 10 is formed by heat-sealing the edges of one sheet 1a, and the joint 12 is formed by heat-sealing the opening edge 11 of the cylindrical shape.

An isolating joint 20 is formed at one of the two upper corners of the bag 1A, surrounding the corner. In this embodiment, the isolating joint 20 is formed by heat-sealing the front sheet 1a and the back sheet 1a together. The isolating joint 20 connects the opening edge 11 and the upper edge 13 and is formed in a convex curve that is convex toward the storage section 21. The isolating joint 20 divides the bag 1A into a storage section 21 that stores food F and a non-storage section 22 that does not store food F.

As a result, the non-storage section 22 is formed in one upper corner of the bag body 1A and is large enough to be held by a human hand (fingers). Furthermore, a cut line 23 is formed in the sheet 1a on the front side (or the back side) of the non-storage section 22. The cut line 23 is formed into a U-shape, semicircle, V-shape, X-shape, cross shape, or other shape using a full cut line, half cut line (half cut), perforation, or the like, and the formation of the cut line 23 forms a tab 24 that serves as an opening starting point.

A strip- or line-shaped opening strip 25 is provided on the inner surface of the sheet 1a, starting from the tab 24, as an opening guide. The opening strip 25 is provided along the direction from one upper corner of the bag 1A to the other corner, along the upper edge 13 of the bag 1A. In other words, the opening strip 25 is provided along the flow direction (stretching direction) of the sheet 1a. The opening strip 25 is, for example, cutting tape or thread attached to the inner surface of the sheet 1a. As a result, a planned opening line is set in the bag 1A, extending from the tab 24 across the isolating joint 20 to the storage section 21. By pulling the tab 24 toward the other corner of the bag 1A, the opening strip 25 cuts the sheet 1a to a predetermined width, allowing the bag 1A to be opened.

As described above, the packaging bag 1 is manufactured using pillow packaging. As shown in Figure 3, the manufacturing process involves: i) supplying and conveying a long sheet material 1a with a tear strip 25 attached to its inner surface along the longitudinal direction (machine direction); ii) forming score lines 23 at unit pitches; iii) supplying food F to the inner surface of the sheet material 1a at unit pitches; iv) overlapping the edges of the sheet material 1a to form a tube to encase the food F and heat-sealing the edges to form the spine 10; v) heat-sealing the sheet material 1a widthwise at unit pitches to form joints 12; vi) heat-sealing the appropriate areas at unit pitches to form isolation joints 20; and vii) separating the packaging bag (food package) 1. Note that Figure 3(b) is a view of the downstream side of the conveying process in Figure 3(a) from the opposite side.

When food F is to be heated and eaten, the packaging body 1 manufactured in this manner is heated, for example, in a microwave oven. Alternatively, other heating methods such as a hot water bath may be used. When placed in a microwave oven, the moisture in the food F turns to steam, and not only the food F but the entire storage section 21, which is filled with steam, heats up. As a result, even if you try to remove the packaging body 1 from the microwave by holding the storage section 21, it is too hot to hold and difficult to remove from the microwave. However, the packaging body 1 of this embodiment has a non-storage section (holding section) 22 that does not generate steam and therefore does not heat up. Therefore, as shown in Figure 4(a), by holding the non-storage section 22, it is easy to hold and remove from the microwave oven.

Furthermore, when opening the package 1, as shown in Figure 4(b), the user holds the non-container portion (holding portion) 22 with one hand and the grip portion (opening starting point) 24 with the other, and pulls the opening strip 25 to open the package 1. This means that there is no need to hold onto the hot part of the package 1 when opening, making it easier to open.

In this way, the packaging bag 1 according to this embodiment remains easy to hold and open even when heated.

Furthermore, if the seal strength of the separating joint 20 is weak, or if a part coating agent is applied to the area between the sheets 1a, 1a where the separating joint 20 is formed, resulting in a weak seal, the separating joint 20 will peel off due to the increase in internal pressure within the containing section 21 caused by heating in a microwave oven, etc. This will allow steam to enter the non-containing section 22, causing it to become hot as well. However, the bonding strength of the separating joint 20 is sufficient and it will not peel off, so this problem will not occur.

In addition, the peel joint 20 is formed in a convex curve, but intersects the opening strip 25 at a right angle or nearly at a right angle. This prevents the opening line from being pulled diagonally by the slope of the peel joint when the opening crosses the peel joint, preventing proper opening. From this perspective, the intersection angle between the opening strip 25 or the intended opening line and the peel joint 20 is 45 degrees or greater, preferably 70 degrees or greater, and more preferably 80 degrees or greater.

Furthermore, the peel joint 20 is not straight, but is formed as a curve with the middle section extending beyond the line connecting one end and the other. This prevents the non-storage section 22 from bending at the peel joint 20 and sagging or tilting, and allows it to always maintain an upright position, providing excellent retention. To improve the uprightness of the non-storage section 22, a textured sealer can be used when heat-sealing the peel joint 20, so that the cross-sectional shape (cross-sectional shape across the peel joint 20) is textured (sine wave, rectangular wave, triangular wave, etc.).

The peel-off joint 20 is also formed in a convex curve that is convex toward the storage section 21. This has the effect of acting as a food position control section that prevents the food F from moving unnecessarily within the storage section 21. However, to prevent the peel-off joint 20 from narrowing the width of the opening and hindering the removal of the food F, it is preferable that the intended opening line be set so that the size of the opening of the storage section 21 is large enough to allow the food F to pass through.

In addition, the cut line (opening notch) 23, which serves as the opening starting point, is located in the non-container section 22, which is isolated from the container section 21. This prevents the problem of foreign objects entering the container section 21 through the cut line 23.

The packaging bag 1 according to this embodiment can take various forms. For example, the shape of the isolating joint 20 may be a convex curve with a discontinuous portion at the intersection of multiple straight or curved lines (two straight lines in the figure), as shown in Figures 5(a) and (b). It may also be formed by a single straight line, as shown in Figure 5(c).

The opening starting point may be a linear opening notch 26 cut inward from the edge of the bag body 1A, as shown in Figure 1(d), or a V- or U-shaped opening notch 27 cut into the edge of the bag body 1A, as shown in Figure 1(e).

Furthermore, the opening strip 25 is not essential; for example, if the sheet 1a can be cut along the intended opening line by utilizing the sheet's directionality, the opening strip 25 does not need to be provided, as shown in Figure (f).

Second Embodiment
A packaging bag for use in a microwave oven according to a second embodiment of the present invention will now be described with reference to FIGS. 6 to 8. FIG.

The packaging bag 1 according to this embodiment basically has the same configuration as the packaging bag 1 according to the first embodiment. Therefore, the same or common components are denoted by the same reference numerals. The only difference is the manner in which the isolating joint 20 is formed and the resulting shape of the bag body 1A.

The isolating joint 20 is formed at one end of the bag body 1A, extending across the bag body 1A parallel or approximately parallel to the joint 12. As a result, the non-storage section 22 is formed at one end of the bag body 1A with the same width as the storage section 21.

The cut line 23 and tab 24 are formed in the widthwise center of the bag body 1A. However, they may also be formed closer to one side edge 13 or the other side edge 15. An opening strip 25 is not provided, but may be provided.

As shown in Figure 6(b), the edge of the isolating joint 20 on the opening start point 24 side may have an uneven shape (sine wave, rectangular wave, triangular wave, etc.) rather than a straight line. In this way, the opening line is guided into the valley, reducing resistance as it passes through the isolating joint 20. This can, of course, also be used in the packaging bag 1 according to the first embodiment.

The packaging bag 1 according to this embodiment is also manufactured using pillow packaging. As shown in FIG. 7, the manufacturing process includes: i) supplying and conveying a long sheet material 1a along the longitudinal direction (machine direction); ii) forming score lines 23 at unit pitches; iii) supplying food F to the inner surface of the sheet material 1a at unit pitches; iv) overlapping the edges of the sheet material 1a to form a tube to encase the food F and heat-sealing the edges to form the spine 10; v) heat-sealing the relevant areas at unit pitches to form the separating joints 20; vi) heat-sealing the sheet material 1a across the width at unit pitches to form the joints 12; and vii) separating the packaging bag (food package) 1. Note that FIG. 7(b) is a view of the downstream side of the conveying process in FIG. 7(a) from the opposite side.

The packaging bag 1 according to this embodiment also achieves the same effects as the packaging bag 1 according to the first embodiment. In addition, according to the packaging bag 1 according to this embodiment, as shown in FIG. 8 , when the packaging body 1 is placed with one end of the storage section 21 facing downwards, the non-storage section 22 serves as a base on which most of the bottom portion of one end of the storage section 21 rests. This has the effect of stabilizing the self-standing ability of the packaging body 1. The non-storage section 22 may be formed to a size that allows at least 50%, preferably at least 70%, and more preferably at least 80% of the bottom portion of one end of the storage section 21 to rest on. In this case, the tab 24 may be raised from the non-storage section 22 and protrude on the side opposite to the side on which the non-storage section 22 is tilted.

As described above, the packaging bag according to the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit and scope of the present invention.

For example, the above-mentioned elemental technologies, such as the shape of the opening starting point, whether or not to provide an opening strip, and whether or not to utilize the orientation of the sheet (film), are mutually applicable between the various embodiments.

In addition, in the above embodiment, the cut line 23 and the tab 24 are provided on one of the front and back sheets of the bag body 1A. However, the opening start point may be provided on both sheets. The opening strip may also be provided on both sheets.

In addition, in the above embodiment, the non-storage section 22 is provided in one location on the bag body 1A. However, the non-storage section 22 may be provided in multiple locations. For example, in another embodiment of the first embodiment, non-storage sections 22 may be provided at both upper corners of the bag body 1A, and each non-storage section 22 may be provided with an opening point, allowing it to be opened from either end. In another embodiment of the second embodiment, a non-storage section 22 may be provided at the other end of the bag body 1A, and this non-storage section 22 may also be provided with an opening point, allowing it to be opened from either end.

In the above embodiment, the packaging bag 1 was a pillow packaging bag. However, the packaging bag according to the present invention is not limited to a pillow packaging bag. It may be a flat bag such as a three-sided bag or a palm-shaped bag, or a gusseted bag, and the opening may be sealed after the contents are placed inside the bag.

In the above embodiment, the sheet 1a constituting the packaging bag 1 is made of a single plastic sheet. However, the material of the sheet is not limited to plastic, and may be paper or a paper-like sheet or other materials. The sheet may also be formed from multiple sheets, such as two sheets joined at their edges to form a single sheet, or three sheets joined at their edges in sequence to form a single sheet. In this case, the sheets may be made of different materials. For example, some of the sheets may be paper or a paper-like sheet rather than plastic.

1...packaging bag (packaging body), 1A...bag body, 1a...sheet, 10...back lining, 11...opening edge, 12...joint, 13...one side edge (upper edge), 14...folded portion, 15...other side edge (lower edge), 16...folded portion, 16a...gusset (bottom gusset), 20...separating joint, 21...storage portion, 22...non-storage portion, 23...slit line, 24...grab portion (opening starting point), 25...opening strip, 26, 27...notch, F...food

Claims (4)

By forming an isolating joint portion so as to surround one corner or two adjacent corners of the bag body made of a sheet, a storage portion that stores contents and a non-storage portion that does not store contents are separated so that gas cannot pass between them,
the isolating joint has a bonding strength that does not peel off even when an internal pressure in the housing portion increases due to heating in a microwave oven ,
The non-container portion is formed to a size that can be held and has an opening starting point,
A planned opening line is set from the opening start point across the separating joint portion to the containing portion. The packaging bag according to claim 1 , wherein the separating joint is formed so as to surround one corner of the bag body, thereby forming the non-container portion at the corner of the bag body. The packaging bag according to claim 2, wherein the outer periphery of the non-storage portion is sealed by a joint that seals an opening edge portion on one end side of the bag body, a folded portion of the sheet at one side edge portion of the bag body, and the isolating joint portion. the separating joint is formed across one end of the bag body, thereby forming the non-container portion at the one end of the bag body;
The packaging bag according to claim 1 , wherein the opening line is set along a direction from the one end to the other end of the bag body.