Packaging bags

Abstract

To provide a packaging bag that is easy to hold and open even when heated. [Solution] The packaging bag of the present invention has an isolating joint 20 formed at a predetermined location on a bag body 1A made of a sheet 1a, thereby dividing a storage section 21 that stores contents F and a non-storage section 22 that does not store contents F so that gas cannot pass between them, and the isolating joint 20 has a bonding strength that prevents it from peeling even when the internal pressure in the storage section 21 increases due to heating by a heating means such as a microwave oven, and the non-storage section 22 is formed to a size that can be held and has an opening starting point 24, and a planned opening line is set that runs from the opening starting point 24 across the isolating joint 20 to the storage section 21.

Description

[Technical Field]

[0001] 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. [Background technology]

[0002] It is common to heat food stored in a packaging bag by placing the packaging in a microwave oven as is. However, when the packaging is heated in a microwave oven, the inside of the packaging bag fills with steam, causing the entire packaging bag to become hot, making it difficult to hold and remove from the microwave.

[0003] 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 and right corners. The wide heat-sealed portion does not become hot even when heated, so by holding the gripping point marking, the bag is not hot and is easy to hold. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3047708 Summary of the Invention [Problem to be solved by the invention]

[0005] 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 at a high temperature must be held, and therefore, although the packaging bag is easy to hold after heating, it is difficult to open, which remains a problem.

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide a packaging bag that is easy to hold and open even when heated. [Means for solving the problem]

[0007] The packaging bag according to the present invention comprises: The bag body is made up of sheets. Surrounding one corner or two adjacent corners By forming the isolating joint, the storage section that stores the contents and the non-storage section that does not store the contents are separated so that gas cannot circulate between them, The isolation junction is Ji The bonding strength is such that it will not peel off even when the internal pressure in the housing increases due to heating. The non-storage 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 starting point across the isolation joint to the storage section. It is a packaging bag.

[0008] Also, in this case, The isolation 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. The above configuration can be adopted.

[0009] Also, in this case, The non-storage portion is sealed at its outer periphery by a joint that seals the opening edge at one end of the bag body, a folded-back portion of the sheet at one side edge of the bag body, and a separating joint. The above configuration can be adopted.

[0011] 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 opening line is set along the direction from one end of the bag body to the other end. The above configuration can be adopted. [Effects of the Invention]

[0013] As described above, with the packaging bag of the present invention, even when the package is heated by a heating means such as a microwave oven, the non-container portion does not become hot, making it easy to hold. Furthermore, since the opening starting point is in the non-container portion, the package can be opened while holding the non-container portion, so there is no need to hold the hot portion, and it is easy to open. [Brief explanation of the drawings]

[0014] [Figure 1] 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 same package package. [Figure 2] Figure 2(a) is a front view of the packaging body, Figure 2(b) is a cross-sectional view taken along line AA of Figure 2(a) when no food is contained therein, and Figure 2(c) is a cross-sectional view taken along line AA of Figure 2(a). [Figure 3] FIG. 3 is an explanatory diagram of the manufacturing process of the package. [Figure 4] Figure 4(a) is a perspective view of holding the 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. [Figure 5] 5(a) to 5(f) are partial front views of packages packaged in packaging bags according to different embodiments. [Figure 6] FIG. 6(a) is a front view of a package packaged in a packaging bag according to a second embodiment of the present invention, and FIG. 6(b) is a front view of a package packaged in a packaging bag according to another embodiment. [Figure 7] FIG. 7 is an explanatory diagram of the manufacturing process of the package. [Figure 8] FIG. 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 in FIG. 8(a). DETAILED DESCRIPTION OF THE INVENTION

[0015] First Embodiment A packaging bag for use in a microwave oven according to a first embodiment of the present invention will be described below with reference to Figs.

[0016] The packaging bag 1 according to this embodiment is in the form of a pillow packaging bag manufactured by a pillow packaging machine, and as shown in FIGS. 1 and 2, is a tubular bag having a spine 10 formed by joining the edge portions of a single sheet 1a, with an opening edge 11 at one end and an opening edge 11 at the other end each sealed with a joining portion 12. One side edge (upper edge) 13 is not a joining portion but is a folded portion 14 of the sheet 1a. The other side edge (lower edge) 15 is also not a joining portion but is a folded portion 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 portion 14 of the upper edge 13. As a result, the packaging bag 1 is cylindrical with the edges joined together to form a back-sealed portion 10, and consists of a bag body 1A made of a single sheet whose outer edges 11, 11, 13, 15 are sealed by a joining portion 12 or folded portions 14, 16.

[0017] 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 contents, food F, when it is in a cylindrical shape. In this embodiment, back lining 10 is formed by heat-sealing the edge portions of one sheet 1a, and joint 12 is formed by heat-sealing opening edge 11 of the cylindrical shape.

[0018] An isolating joint 20 is formed at one of the upper corners of the bag 1A so as to surround 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.

[0019] As a result, non-container section 22 is formed at one corner of the upper side of bag body 1A, and is large enough to be held by a person's hand (fingers). Also, cut lines 23 are formed in sheet 1a on the front side (or the back side) of non-container section 22. Cut lines 23 are formed into U-shapes, semicircular, V-shapes, X-shapes, cross-shapes, --shapes, etc. by full cut lines, half cut lines (half cuts), perforations, etc., and the formation of cut lines 23 forms tab portions 24 as opening start points.

[0020] A strip-like or linear 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 upper corner, along the upper edge 13 of the bag 1A. That is, the opening strip 25 is provided along the flow direction (stretching direction) of the sheet 1a. The opening strip 25 is, for example, a 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 separating joint 20 to the storage compartment 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.

[0021] The packaging bag 1 having the above configuration is manufactured by pillow packaging, as described above. As shown in Figure 3, the manufacturing process includes: i) feeding and conveying a long sheet raw material 1a having a tear strip 25 attached to its inner surface along the longitudinal direction (machine direction); ii) forming slit lines 23 at unit pitches; iii) feeding food F to the inner surface of the sheet raw material 1a at unit pitches; iv) overlapping the edge portions of the sheet raw material 1a to form a tube so as to encase the food F and heat-sealing the edge portions to form a spine 10; v) heat-sealing the sheet raw material 1a widthwise at unit pitches to form joints 12; vi) heat-sealing the corresponding portions at unit pitches to form separating 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.

[0022] When it is desired to heat and eat the food F in the packaging body 1 manufactured in this manner, it 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 water in the food F turns to steam, and not only the food F but also the entire storage section 21, which is filled with steam, heats up. Therefore, even if one tries to remove the packaging body 1 from the microwave oven by holding the storage section 21, it is too hot to hold and difficult to remove from the microwave. However, the packaging body 1 according to 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 FIG. 4(a), by holding the non-storage section 22, it is easy to hold and remove from the microwave oven.

[0023] Furthermore, when opening the package, as shown in Figure 4(b), the package 1 can be opened by holding the non-container portion (holding portion) 22 with one hand and the grip portion (opening starting point) 24 with the other hand and pulling the opening strip 25, so there is no need to hold the hot part of the package 1 when opening, making it easier to open.

[0024] In this way, the packaging bag 1 according to this embodiment can be made easy to hold and easy to open even when heated.

[0025] Furthermore, if the seal strength of the isolating joint 20 is weak, or if a part coating agent is applied to the area between the sheets 1a, 1a where the isolating joint 20 is formed, causing the peel joint 20 to be weakly sealed, the isolating joint 20 will peel off due to the increase in internal pressure within the storage section 21 caused by heating in a microwave oven or the like, and this will allow steam to enter the non-storage section 22, causing the non-storage section 22 to also become hot. However, the bonding strength of the peel joint 20 is sufficient and it will not peel off, so this problem does not occur.

[0026] Furthermore, 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 by the inclination of the peel joint and deviating obliquely 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 more, preferably 70 degrees or more, and more preferably 80 degrees or more.

[0027] Furthermore, the peel joint 20 is not straight, but is formed as a curve with the middle part extending beyond the line connecting one end and the other. This prevents the non-housing portion 22 from sagging or tilting due to bending at the peel joint 20, and allows the non-housing portion 22 to always maintain an upright posture, resulting in excellent retention. In order to improve the uprightness of the non-housing portion 22, a sealer with an uneven shape can be used when heat-sealing the peel joint 20, so that the cross-sectional shape (cross-sectional shape across the peel joint 20) becomes an uneven shape (sine wave, rectangular wave, triangular wave, etc.).

[0028] Furthermore, peel-off joint 20 is formed in a convex curve that is convex toward storage section 21. This has the effect of acting as a food position control section that prevents food F from moving unnecessarily within storage section 21. However, to prevent peel-off joint 20 from narrowing the width of the opening and hindering the discharge of food F, it is preferable that the intended opening line be set so that the size of the opening of storage section 21 is large enough to allow food F to pass through.

[0029] In addition, the cut line (opening notch) 23, which is the opening starting point, is provided in the non-container section 22, which is isolated from the container section 21. This prevents the problem of foreign matter or the like entering the container section 21 through the cut line 23.

[0030] The packaging bag 1 according to this embodiment can have various shapes. 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 5(b). Alternatively, it may be formed by a single straight line, as shown in Figure 5(c).

[0031] 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).

[0032] Furthermore, the opening strip 25 is not essential, and if, for example, the sheet 1a can be cut along the intended opening line by utilizing the directionality of the sheet, the opening strip 25 does not need to be provided, as shown in the same figure (f).

[0033] Second Embodiment A packaging bag for use in a microwave oven according to a second embodiment of the present invention will be described below with reference to FIGS.

[0034] The packaging bag 1 according to this embodiment has basically 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 difference is in the formation mode of the isolating joint 20 and the resulting shape of the bag body 1A.

[0035] The isolating joint 20 is formed at one end of the bag body 1A so as to cross the bag body 1A in parallel or approximately parallel to the joint 12. As a result, the non-storage portion 22 is formed at one end of the bag body 1A with the same width as the storage portion 21.

[0036] The cut line 23 and the tab 24 are formed in the widthwise center of the bag body 1A. However, they may 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.

[0037] As shown in Figure 6(b), the edge of the isolating joint 20 on the opening starting point 24 side may be formed in an uneven shape (sine wave, rectangular wave, triangular wave, etc.) instead of a straight line. In this way, the resistance when the opening line passes through the isolating joint 20 can be reduced by being guided into the valley portion. This can of course also be adopted in the packaging bag 1 according to the first embodiment.

[0038] The packaging bag 1 according to this embodiment is also manufactured using pillow packaging. As shown in Figure 7, the manufacturing process includes: i) feeding and conveying a long sheet material 1a along the longitudinal direction (machine direction); ii) forming score lines 23 at unit pitches; iii) feeding food F to the inner surface of the sheet material 1a at unit pitches; iv) overlapping the edge portions of the sheet material 1a to form a tube so as to encase the food F and heat-sealing the edge portions to form a spine 10; v) heat-sealing the corresponding portions at unit pitches to form separating joints 20; vi) heat-sealing the sheet material 1a across the width at unit pitches to form joints 12; and vii) separating the packaging bag (food package) 1. Note that Figure 7(b) is a view of the downstream side of the conveying process in Figure 7(a) from the opposite side.

[0039] The packaging bag 1 according to this embodiment also achieves the same effects as those of 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 the 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 the 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 laid down.

[0040] As described above, the packaging bag according to the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention.

[0041] For example, the above-mentioned elemental technologies, such as the shape of the opening starting point, whether or not to provide an opening strip, whether or not to utilize the directionality of the sheet (film), etc., are mutually applicable between the embodiments.

[0042] In the above embodiment, the cut line 23 and the tab 24 are provided on one of the front and rear 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.

[0043] In the above embodiment, the non-storage portion 22 is provided in one location on the bag body 1A. However, the non-storage portion 22 may be provided in multiple locations. For example, in another embodiment of the first embodiment, the non-storage portion 22 may be provided in both upper corners of the bag body 1A, and each non-storage portion 22 may be provided with an opening start point, so that the bag body 1A can be opened from either side. In another embodiment of the second embodiment, the non-storage portion 22 may be provided at the other end of the bag body 1A, and this non-storage portion 22 may also be provided with an opening start point, so that the bag body 1A can be opened from either side.

[0044] In the above embodiment, the packaging bag 1 is 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 gusset bag, which is made so that the opening is sealed after the contents are placed inside the bag.

[0045] 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 a plastic sheet, and may be a sheet of other material, such as paper or a paper-like sheet. 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 to form a single sheet. In this case, the sheets may be made of different materials. For example, some sheets may be made of paper or a paper-like sheet instead of a plastic sheet. [Explanation of symbols]

[0046] 1...packaging bag (packaging body), 1A...bag body, 1a...sheet, 10...back adhesive portion, 11...opening edge portion, 12...joint portion, 13...one side edge portion (upper edge portion), 14...folded portion, 15...other side edge portion (lower edge portion), 16...folded portion, 16a...gusset (bottom gusset), 20...isolating joint portion, 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

1. 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 isolation joint to the storage section. packaging bag.

2. The separating 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. The packaging bag according to claim 1.

3. The non-storage portion has an outer periphery sealed by a joint that seals an opening edge on one end side of the bag body, a folded-back portion of the sheet at one side edge of the bag body, and the separating joint. The packaging bag according to claim 2.

4. 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 intended opening line is set along a direction from the one end to the other end of the bag body. The packaging bag according to claim 1.

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