packaging bags

Abstract

To provide a packaging bag that is easy to open after heating the product to be packaged.SOLUTION: A packaging bag 1 of the invention has: a bag-shaped sheet body 10; a vapor release portion 30 formed on the sheet body 10 and connecting the inside and outside of the sheet body 10; an opening portion 40 formed on the sheet body 10 and communicating the inside and outside of the sheet body 10; a vapor seal 50 attached to an outer surface 11b of the sheet body 10 so as to cover the vapor release portion 30; and an opening seal 60 that is attached to the outer surface 11b so as to cover the opening portion 40 and that can be peeled off separately from the vapor seal 50, wherein a vapor side area 13 where the vapor release portion 30 is formed and an opening side area 14 where the opening portion 40 is formed in the sheet body 10 are adjacent to each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging bag. [Background technology]

[0002] Conventionally, packaging bags have been used to hermetically seal and hygienically package packaged items such as food. This type of technology is described, for example, in Patent Document 1. Patent Document 1 describes a packaging bag for use in a microwave oven, in which a notch for opening is formed near the upper edge of the side edge seal, the inner end of the notch is positioned within the protruding seal, and an easily peelable film is sandwiched between the side edge seal around the notch and the protruding seal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-274771 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology of Patent Document 1, steam is released through the notch while the packaged item is being heated in a microwave oven or the like, and the heat of the steam heats the notch after heating. Since a user has to open the packaging bag by pinching the area around the heated notch, there is room for improvement in terms of making it easier to open the packaged item after it has been heated.

[0005] Therefore, an object of the present invention is to provide a packaging bag that can be easily opened after the packaged contents have been heated. [Means for solving the problem]

[0006] (1) The packaging bag of the present invention comprises a bag-shaped sheet body, a steam release section formed in the sheet body and connecting the inside and outside of the sheet body, an opening section formed in the sheet body and connecting the inside and outside of the sheet body, a steam seal attached to the outer surface of the sheet body so as to cover the steam release section, and an opening seal attached to the outer surface so as to cover the opening section and which can be peeled off separately from the steam seal, and the steam seal and the opening seal are adjacent to each other.

[0007] (2) In (1), the steam release portion and the tear-open portion are formed on the same surface of the sheet body.

[0008] (3) In (1) or (2), the steam seal and the opening seal are formed by a single sealing member, and the sealing member has a weakened line portion that divides the steam seal and the opening seal into two.

[0009] (4) In (3), the weakened line portion is a perforation formed by alternating through-portions that penetrate the sealing member and non-through-portions that do not penetrate the sealing member, or a half cut formed by removing a portion of the sealing member in the thickness direction.

[0010] (5) In any one of (1) to (4), the steam release portion is formed by a cut that is substantially U-shaped in a plan view, and the tear-open portion is formed by a cut that is substantially inverted U-shaped in a plan view. In this specification, the term "approximately" does not strictly specify the state, but rather means to include a state that approximates the function or effect within a range that is achievable.

[0011] (6) In any of (1) to (5), the sheet further comprises a tear-off tape extending in a direction perpendicular to the direction in which the steam seal and the tear-off seal are aligned and passing through the area of ​​the sheet body where the tear-off seal is attached. [Effects of the Invention]

[0012] According to the present invention, a packaging bag can be provided that is easy to open after the packaged items have been heat-treated. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a plan view of a packaging bag according to one embodiment of the present invention. [Figure 2] 1 is a perspective view of a packaging bag according to one embodiment of the present invention. [Figure 3] 2 is an enlarged plan view showing the sealing member and its periphery of the packaging bag according to one embodiment of the present invention. FIG. [Figure 4] 1 is a development view of a packaging bag according to one embodiment of the present invention. [Figure 5] 1 is an exploded perspective view of a packaging bag according to one embodiment of the present invention. [Figure 6A] 1 is a perspective view showing a state in which a packaged item, a prepared food bread, is packaged in a packaging bag according to one embodiment of the present invention. FIG. [Figure 6B] 6B is a perspective view showing the state in which the steam seal of the packaging bag of FIG. 6A has been peeled off. FIG. [Figure 6C] 6C is a perspective view showing a state in which the opening seal of the packaging bag in FIG. 6B is being peeled off. FIG. [Figure 7] 1 is a perspective view showing a packaging material roll for a packaging bag according to an embodiment of the present invention. [Figure 8] 1 is a side view schematically showing a production line for carrying out a method for producing a packaging material for a packaging bag according to an embodiment of the present invention. [Figure 9] FIG. 10 is a plan view of a packaging bag according to a modified example. [Figure 10] FIG. 10 is a rear view of a packaging bag according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] FIG. 1 is a plan view of a packaging bag 1 according to this embodiment, FIG. 2 is a perspective view of the packaging bag 1 as seen from diagonally above right, FIG. 3 is an enlarged plan view of a sealing member 5 of the packaging bag 1 and its periphery, FIG. 4 is a developed view of the packaging bag 1, and FIG. 5 is an exploded perspective view of the packaging bag 1. FIGS. 6A to 6C are perspective views showing a state in which an item 2 to be packaged is packaged in the packaging bag 1. The packaging bag 1 is a flat bag formed by folding back a single sheet-like packaging material 1a. The packaging bag 1 is formed into a vertically long rectangular shape in a plan view. The outer shape of the packaging bag 1 according to the present invention is not limited to a rectangular shape, and may be a square shape, a polygonal shape, or a shape whose outer shape includes curves. In addition to flat bags, the packaging bag 1 can also be applied to bags with a three-dimensional shape, such as a gusset bag.

[0016] Here, in this specification, the longitudinal direction L means the longitudinal direction of the packaging bag 1. The transverse direction W means the widthwise direction of the packaging bag 1. One side L1 in the longitudinal direction means the upper side of the packaging bag 1 in Fig. 1, and the other side L2 in the longitudinal direction means the lower side of the packaging bag 1 in Fig. 1. One side W1 in the transverse direction means the left side of the packaging bag 1 in Fig. 1, and the other side W2 in the transverse direction means the right side of the packaging bag 1 in Fig. 1.

[0017] The packaging bag 1 shown in Fig. 1 has an end portion on one longitudinal side L1 that is open. The packaging bag 1 is a bag for sealing and storing a packaged item 2, such as a liquid, powder, granular, or solid food product. Examples of the solid packaged item 2 that can be stored in the packaging bag 1 include rice balls and bread.

[0018] The packaging bag 1 includes a main sheet body 10, a steam release section 30, an opening section 40, a steam seal 50, an opening seal 60, a tear tape 70, and a strip-shaped sheet section 80.

[0019] As shown in Fig. 2, the sheet body 10 has a vertically long rectangular shape with a storage section 3 therein for storing the packaged item 2. The sheet body 10 is configured by forming a single sheet-like resin film into a bag shape with a back sealing section 21 and a first seal section 22 as shown in Fig. 4.

[0020] 2 and 4, the spine sealing portion 21 is formed by joining opposing folded tip portions 15, 16 together in a state where a sheet-like resin film is folded back. The first sealed portion 22 is formed by joining opposing edge portions 17 of the resin film together on the other longitudinal side L2 of the packaging bag 1, which is the extending direction of the spine sealing portion 21. The spine sealing portion 21 and the first sealed portion 22 are formed by joining the resin films by means of, for example, thermal welding (heat sealing) or ultrasonic welding.

[0021] In the packaging bag 1 of this embodiment, the packaged item 2, such as food, is placed in the storage section 3 from the open end of one longitudinal side L1 of the sheet body 10, and then the end of one longitudinal side L1 is sealed by a second seal section 23, which will be described later, as shown in Fig. 6A. The packaged item 2 is placed in the packaging bag 1 with the front surface 11 of the sheet body 10 facing up and the back surface 12 facing down. In this embodiment, the surface on which the spine sealing section 21 is formed is the back surface 12 of the sheet body 10.

[0022] The surface 11 of the sheet body 10 is formed with an inner surface 11a facing the packaged item 2 and an outer surface 11b opposite the inner surface 11a, and the back surface 12 of the sheet body 10 is formed with an inner surface 12a facing the packaged item 2 and an outer surface 12b opposite the inner surface 12a.

[0023] The steam release portion 30 is a portion for releasing steam inside the main sheet body 10 to the outside. The steam release portion 30 is formed on the surface 11 of the main sheet body 10, and connects the inside and outside of the main sheet body 10. More specifically, as shown in FIG. 1 , the steam release portion 30 is located in the center of the main sheet body 10 in the longitudinal direction L, and penetrates from the outer surface 11b to the inner surface 11a of the surface 11 near one side W1 in the short direction. The entire steam release portion 30 may connect the inside and outside of the main sheet body 10, or only a portion of it may connect the inside and outside of the main sheet body 10, like a perforation. The region of the main sheet body 10 where the steam release portion 30 is formed is referred to as the steam-side region 13.

[0024] The tearing portion 40 is a portion for opening the sealed packaging bag 1. The tearing portion 40 is formed on the surface 11 of the sheet body 10 and connects the inside and outside of the sheet body 10. More specifically, as shown in FIG. 1 , the tearing portion 40 is located in the center of the sheet body 10 in the longitudinal direction L, penetrating from the outer surface 11b of the surface 11 toward the other side W2 in the short direction to the inner surface 11a. That is, the tearing portion 40 is formed on the same surface as the steam release portion 30 of the sheet body 10. The entire steam release portion 30 may be configured to connect the inside and outside of the sheet body 10, or only a portion of it, like a perforation, may connect the inside and outside of the sheet body 10. The region of the sheet body 10 where the tearing portion 40 is formed is referred to as the tearing side region 14. As shown in FIGS. 1 to 3 , the steam side region 13 and the tearing side region 14 are adjacent to each other in the sheet body 10.

[0025] The steam seal 50 is a rectangular film. The steam seal 50 is attached to the outer surface 11b of the sheet body 10 so that a portion of the steam seal 50 covers the steam escape portion 30. The steam seal 50 includes a steam protection portion 51 and a steam gripping portion 52.

[0026] The steam protective portion 51 is adhered to the outer surface 11b in the steam-side region 13 of the sheet body 10, and covers the steam escape portion 30. The entire area of ​​the steam protective portion 51 is adhered to the outer surface 11b, and the steam escape portion 30 is blocked by this steam protective portion 51. Therefore, the steam escape portion 30 is separated from the outside by the steam protective portion 51. The steam grip portion 52 is a portion that is continuous with one longitudinal side L1 of the steam protective portion 51, and is not adhered to the outer surface 11b. The steam grip portion 52 can be picked up with the fingers and turned over toward the outer surface 11b. The steam-side region 13 is the region in the sheet body 10 where the steam escape portion 30 is formed, and is also the region where the steam seal 50 is attached.

[0027] The tear seal 60 is a rectangular film. The tear seal 60 is attached to the outer surface 11b of the sheet body 10 so that a portion of the tear seal 60 covers the tear portion 40. The tear seal 60 includes a tear protection portion 61 and a tear grip portion 62.

[0028] The tear-opening protective portion 61 is adhered to the outer surface 11b in the tear-side region 14 of the sheet main body 10, and covers the tear-opening portion 40. The entire area of ​​the tear-opening protective portion 61 is adhered to the outer surface 11b, and this tear-opening protective portion 61 blocks the tear-opening portion 40. Therefore, the tear-opening protective portion 61 separates the tear-opening portion 40 from the outside. The tear-opening grip portion 62 is a portion that is continuous with one longitudinal side L1 of the tear-opening protective portion 61, and is not adhered to the outer surface 11b. The tear-opening grip portion 62 can be picked up with the fingers and turned over toward the outer surface 11b. The tear-opening side region 14 is the region where the tear-opening portion 40 of the sheet main body 10 is formed, and is also the region where the tear-opening seal 60 is affixed.

[0029] Next, a detailed configuration of the packaging bag 1 in the steam side region 13 and the opening side region 14 will be described. As shown in Fig. 3, the steam release portion 30 is formed by a cut that is approximately U-shaped in plan view. That is, the steam release portion 30 is formed so that each of the branched ends 31, 32 of the approximately U-shape extends toward one side L1 in the longitudinal direction.

[0030] The steam release portion 30 forms a steam release piece 24 in part of the sheet body 10. The steam release piece 24 is a portion of the sheet body 10 that is surrounded by the approximately U-shaped cut of the steam release portion 30. The steam release piece 24 is formed so that its area decreases from the side of the steam grip portion 52 that is not adhered to the sheet body 10 toward the other longitudinal side L2. In other words, when the steam grip portion 52 is pinched to peel off the steam seal 50, the area of ​​the steam release piece 24 that is adhered to the sheet body 10 decreases as the steam seal 50 is pulled. This makes it possible to keep the opening 33 that is formed starting from the steam release portion 30 small.

[0031] 3, the tearing portion 40 is formed by a cut that is substantially inverted U-shaped in a plan view. That is, the tearing portion 40 is formed so that each of the branched ends 41, 42 of the substantially inverted U-shape extends toward the other longitudinal side L2.

[0032] The tearing portion 40 forms a tearing strip 25 in a part of the sheet body 10. The tearing strip 25 is a part of the sheet body 10 surrounded by a substantially inverted U-shaped cut of the tearing portion 40, and allows part of the sheet body 10 to be turned over toward the outer surface 11b. The tearing strip 25 is formed so that its area increases from the side of the tearing grip 62 that is not adhered to the sheet body 10 toward one side L1 in the longitudinal direction. When the tearing grip 62 is pinched to peel off the tearing seal 60, the area of ​​the tearing strip 25 adhered to the sheet body 10 increases as the tearing seal 60 moves in the direction of pulling. This makes it possible to tear the sheet body 10 toward the other side L2 in the longitudinal direction, starting from the ends 41, 42 of the tearing portion 40.

[0033] The steam seal 50 and the tear seal 60 are arranged next to each other. In this embodiment, the steam seal 50 and the tear seal 60 are formed by a single sealing member 5. As shown in FIG. 3 , the sealing member 5 has a rectangular shape that is long in the short side direction W, and one short side W1 from approximately the center of the short side direction W of the packaging bag 1 forms the steam seal 50, and the other short side W2 forms the tear seal 60. The sealing member 5 has a slit 5a and a weakened line portion 5b that divides the sealing member 5 into the steam seal 50 and the tear seal 60.

[0034] The slit 5a and the weakened line portion 5b extend in the longitudinal direction L between the steam seal 50 and the opening seal 60 in the sealing member 5. The slit 5a is a line that extends continuously through the front and back surfaces of the sealing member 5 and does not connect the steam seal 50 and the opening seal 60. The slit 5a is formed between the steam grip portion 52 and the opening grip portion 62.

[0035] The line of weakness 5b is a line that connects at least a portion of the steam seal 50 and the tear-open seal 60. The line of weakness 5b is formed between the steam protection part 51 and the tear-open protection part 61. The line of weakness 5b may be, for example, a perforation formed by alternating through-portions that penetrate the seal member 5 and non-penetrating portions that do not penetrate the seal member 5, or may be a half-cut formed by removing a portion of the seal member 5 in the thickness direction. In this embodiment, a perforation is formed as the line of weakness 5b. Note that the perforation in this specification also includes micro-perforations.

[0036] 1 to 5, a tear tape 70 is arranged on the inner surface 11a of the surface 11 of the sheet main body 10. The tear tape 70 is attached to the inner surface 11a of the sheet main body 10 by means of ultrasonic sealing, heat sealing, adhesive application, or the like.

[0037] 1 to 3, the tear tape 70 extends in a direction (longitudinal direction L) perpendicular to the direction in which the steam seal 50 and the tear seal 60 are aligned, and passes through the area of ​​the sheet main body 10 where the tear seal 60 is attached. In this embodiment, the tear tape 70 is arranged so as to pass through the tear portion 40. More specifically, the tear tape 70 is arranged so as to pass through approximately the center of the tear portion 40 in the short direction W.

[0038] As described above, when the sheet body 10 is torn at the tear strip 25, slits 44 are formed in the sheet body 10 on extensions of the ends 41, 42 of the tear portion 40, and these pairs of slits 44 propagate to tear the sheet body 10. The tear tape 70 is disposed inside each slit 44. Therefore, even if the slit 44 propagates toward the inner tear tape 70, the slit 44 propagates along the tear tape 70 without hitting the tear tape 70 and cutting further inward. Therefore, the pair of slits 44 formed on both sides of each tear tape 70 are maintained and do not disappear. The tear tape 70 may be disposed on the outer surface 11b of the sheet body 10, or on both the inner surface 11a and the outer surface 11b.

[0039] As shown in FIGS. 1 to 5, a pair of strip-shaped sheet portions 80 extending in the longitudinal direction are arranged on the inner surface 12a of the back surface 12 of the sheet main body 10. The strip-shaped sheet portions 80 are attached to the inner surface 11a of the sheet main body 10 by means of ultrasonic sealing, heat sealing, adhesive application, or the like. The strip-shaped sheet portions 80 are approximately parallel to the tear tape 70. Each of the pair of strip-shaped sheet portions 80 is arranged a predetermined distance away from the tear tape 70 and outward in the short direction. The strip-shaped sheet portions 80 may be arranged on the outer surface 12b of the sheet main body 10, or may be arranged on both the inner surface 12a and the outer surface 12b.

[0040] The main sheet body 10, steam seal 50, tear seal 60, tear tape 70, and strip-shaped sheet portion 80 are each made of a transparent or translucent film made of flexible synthetic resin. The resin film preferably has heat-welding properties to facilitate heat sealing. The resin film may be a single-layer or multi-layer synthetic resin film. In the case of a single layer, examples include synthetic resin films such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). In the case of a multi-layer, examples include synthetic resin films such as polypropylene coated with PVDC (polyvinylidene chloride) to provide a moisture-blocking barrier layer. Specifically, OPP (biaxially oriented polypropylene) and CPP (non-oriented polypropylene) are preferably used. The main sheet body 10, steam seal 50, and tear seal 60 may be made of paper or a laminate of paper and film.

[0041] The resin films forming the main sheet body 10, steam seal 50, tear seal 60, tear tape 70, and strip-shaped sheet portion 80 may have the same thickness. However, it is desirable to use relatively thick steam seals 50 and tear seals 60 so that the steam grip portion 52 and tear grip portion 62, which are held by the fingers when peeling them, do not tear. It is desirable that the main sheet body 10 has a thickness that allows the packaged state to be maintained, but also allows it to be easily torn when opening.

[0042] Next, an example of how to use the packaging bag 1 will be described with reference to Figures 6A to 6C. The packaging bag 1 shown in Figure 6A contains an article 2 to be packaged with the front surface 11 of the sheet body 10 facing up and the back surface 12 facing down. The article 2 to be packaged is a prepared bread that is to be heated in a microwave oven before eating.

[0043] First, when a user peels back steam gripping portion 52 of steam seal 50 and pulls steam gripping portion 52 toward the other longitudinal side L2, weakened line 5b ruptures and steam protective portion 51 peels off from outer surface 11b of sheet body 10. Because steam seal 50 is peeled off as weakened line 5b ruptures, opening protective portion 61 remains attached to outer surface 11b of sheet body 10. At this time, steam escape piece 24 peeled off from steam protective portion 51 peels back, and opening 33 is formed in the area surrounded by steam escape portion 30, as shown in FIG. 6B . When packaged item 2 contained in packaging bag 1 is heated in a microwave oven, steam inside storage portion 3 is released to the outside through steam escape portion 30 and opening 33.

[0044] After heating the packaged item 2, when the user turns over the opening grip 62 and pulls the opening grip 62 toward the other longitudinal side L2, the opening protection part 61, which is outside the opening part 40 in plan view, peels off from the outer surface 11b. At this time, the opening seal 60 is not directly exposed to the steam released from the steam release part 30, so the heat of the steam is not easily transmitted. Therefore, the user can easily open the packaging bag 1 after heating in a microwave oven or the like.

[0045] 6C , when the tearing portion 40 is continued to be pulled, the tearing flap 25, which is adhered to and overlaps the tearing protective portion 61, is turned over toward the outer surface 11b along with the tearing protective portion 61 and pulled toward the other longitudinal side L2. As a result, a slit 44 is made in the main sheet body 10 on an extension of the ends 41, 42 of the tearing portion 40, and a strip-shaped opening 43 extending in the longitudinal direction L is formed between the pair of slits 44 on both sides of the short side direction W. This opening 43 separates the packaging bag 1 into left and right halves, allowing the packaged item 2 to be eaten through the opening 43 while being grasped by hand. Alternatively, the packaged item 2 can be removed through the opening 43.

[0046] A large number of packaging materials 1a forming the packaging bag 1 can be continuously obtained from a packaging material roll 1R according to the embodiment shown in FIG.

[0047] The packaging material roll 1R according to the embodiment is a long packaging material roll 1G in which many packaging materials 1a are integrated so as to be continuous along the length direction and wound into a roll shape. By cutting the packaging material roll 1R along a cutting boundary 1c, many packaging materials 1a can be obtained one after another.

[0048] The packaging material raw roll 1G is mainly composed of a long, strip-shaped sheet body raw roll 10G made of resin film. The sheet body raw roll 10G has cutting boundaries 1c that separate a large number of sheet body portions 10A, which will each become the sheet body 10. Each sheet body portion 10A is provided with a steam release portion 30 and a tear-open portion 40, and sealing members 5 that close the steam release portion 30 and the tear-open portion 40 are adhered to the side that will be set as the outer surface 11b. The steam protection portion 51 and the tear-open protection portion 61 of the sealing member 5 are releasably adhered to the sheet body raw roll 10G by adhesive, heat sealing, part coating, etc.

[0049] In the packaging material roll 1R, it is preferable that the sealing member 5 arranged on the side of the sheet body roll 10G that is set to the outer surface 11b of the packaging bag 1 has the steam gripping portion 52 and the opening gripping portion 62 that are not adhered to the sheet body roll 10G arranged on the roll winding side, and the steam protective portion 51 and the opening protective portion 61 that are adhered to the sheet body roll 10G arranged on the roll unwinding side.

[0050] The raw roll of material that will become the tear tape 70, i.e., tear tape raw roll 70G, is attached to the surface that will be set to the inner surface 11a of the packaging bag 1. Furthermore, the raw rolls that will become the pair of strip-shaped sheet portions 80, i.e., strip-shaped sheet portion raw roll 80G, are attached to the surface that will be set to the inner surface 12a of the packaging bag 1. The packaging material raw roll 1R is preferably wound into a roll so that the outer surface 11b to which the sealing member 5 is attached is positioned on the outer peripheral surface side. Therefore, the tear tape raw roll 70G and the strip-shaped sheet portion raw roll 80G are preferably positioned on the inner peripheral surface side.

[0051] By sequentially cutting the cutting boundaries 1c while unwinding the packaging material 1G from the packaging material roll 1R, it is possible to obtain one packaging material 1a at a time. Furthermore, when unwinding the packaging material 1G from the packaging material roll 1R, the steam protective portion 51 and the opening protective portion 61 that are adhered to the sheet main body 10G of the sealing member 5 are unwound first, and the unadhered steam grip portion 52 and opening grip portion 62 come out later. This prevents the steam grip portion 52 and opening grip portion 62 from turning over or folding and overlapping, allowing for smooth operation.

[0052] The packaging material raw roll 1R and packaging material 1a are manufactured, for example, by a manufacturing line 100 shown in Fig. 8. The manufacturing line 100 can be used to carry out an example of the manufacturing method of the present invention.

[0053] In the production line 100 shown in FIG. 7, the sheet body 10G is unwound from the sheet body roll 10R in approximately the H direction and conveyed. The tear tape roll 70G unwound from the tear tape roll 70R and the strip-shaped sheet roll 80G unwound from the strip-shaped sheet roll 80R are overlapped at predetermined locations on the outer surface of the sheet body 10G immediately after unwound from the sheet body roll 10R. Next, the tear tape roll 70G and the strip-shaped sheet roll 80G are attached to the sheet body 10G in the sealing unit 110. The sealing unit 110 has an attachment means such as ultrasonic sealing or heat sealing, but ultrasonic sealing is preferred because it is less likely to cause wrinkles in the attached area and its surroundings.

[0054] Next, the steam release portions 30 and the tear-open portions 40 are formed in the sheet main body web 10G by the incision forming section 120. The steam release portions 30 and the tear-open portions 40 are formed by punching the sheet main body web 10G with a cutter (not shown) having the respective shapes. The steam release portions 30 and the tear-open portions 40 are formed intermittently at predetermined locations in the areas of each packaging material 1a partitioned in the sheet main body web 10G by the cutting boundaries 1c.

[0055] Next, the sealing member 5 is adhered to the inner surface of the sheet body raw roll 10G at the seal adhering section 130. The sealing members 5 are peeled off one by one from the sealing member 5 raw roll 5R, in which the sealing members 5 are adhered to a backing sheet at regular intervals, and are adhered intermittently to predetermined locations on the sheet body raw roll 10G that close the steam release portion 30 and the opening portion 40.

[0056] In the manner described above, the tear tape raw material 70G and the strip-shaped sheet raw material 80G are attached to the sheet main body raw material 10G, the steam release portion 30 and the tear portion 40 are formed, and the sealing member 5 is adhered to the steam release portion 30 and the tear portion 40 to produce the packaging material raw material 1G shown in FIG. 8 , which is then wound up to obtain the packaging material raw material roll 1R. The packaging material raw material 1G is then unwound from the packaging material raw material roll 1R, and the sheet main body 10A is cut at the cutting boundary 1c to obtain individual packaging materials 1a. One packaging material 1a is then folded back to form the spine sealing portion 21 and the first seal portion 22, thereby obtaining the packaging bag 1.

[0057] The packaging material raw web 1G according to this embodiment has a pair of strip-shaped sheet raw webs 80G extending in the lengthwise direction attached near both widthwise ends. This prevents thickness unevenness, which occurs when the tear tape raw web 70G and the sealing member 5 increase the thickness at the widthwise center, and makes the widthwise thickness uniform overall. As a result, when the packaging material raw web 1G is wound up to obtain the packaging material roll 1R, twisting due to thickness unevenness and poor winding are prevented.

[0058] The effects achieved by the embodiment will be described below.

[0059] The packaging bag 1 according to this embodiment comprises a bag-shaped sheet body 10, a steam release section 30 formed in the sheet body 10 and connecting the inside and outside of the sheet body 10, an opening section 40 formed in the sheet body 10 and connecting the inside and outside of the sheet body 10, a steam seal 50 attached to the outer surface 11b of the sheet body 10 so as to cover the steam release section 30, and an opening seal 60 attached to the outer surface 11b so as to cover the opening section 40 and which can be peeled off separately from the steam seal 50, and the steam seal 50 and the opening seal 60 are adjacent to each other.

[0060] As a result, the seals covering the steam release portion 30 and the tearing portion 40 are arranged in adjacent areas and can be peeled off separately, which reduces the amount of heat transferred to the tearing seal 60 after heating and makes it easier to open the tearing portion 40 after heating. Furthermore, the packaging bag 1 has a shape that is easy to produce, as the steam seal 50 and the tearing seal 60 are arranged in adjacent areas. This makes it easier to open the packaged item 2 after heating while maintaining high productivity.

[0061] In the packaging bag 1 according to this embodiment, the steam release portion 30 and the tearing portion 40 are formed on the same surface of the main sheet body 10.

[0062] As a result, the steam release section 30 and the opening section 40 are formed on the same surface, so that after peeling off the steam seal 50 to open the steam release section 30, the opening seal 60 can be peeled off without changing the orientation of the packaging bag 1, making it difficult for the packaged item 2 contained in the containing section 3 to leak.

[0063] In the packaging bag 1 of this embodiment, the steam seal 50 and the opening seal 60 are formed by a single sealing member 5, and the sealing member 5 has a weak line portion 5b to divide the sealing member 5 into the steam seal 50 and the opening seal 60.

[0064] This allows seals that have two functions and can be peeled off separately to be produced from one sealing member 5, thereby improving the productivity of the packaging bag 1.

[0065] In the packaging bag 1 of this embodiment, the weak line portion 5b is a perforation formed by alternating arrangement of through portions that penetrate the sealing member 5 and non-through portions that do not penetrate the sealing member 5, or a half cut formed by removing a portion of the sealing member 5 in the thickness direction.

[0066] This makes it easier to manufacture the sealing member 5, which can be easily divided into two parts.

[0067] In the packaging bag 1 according to this embodiment, the steam release portion 30 is a substantially U-shaped cut, and the tearing portion 40 is a substantially inverted U-shaped cut.

[0068] As a result, even if the steam side region 13 and the tear side region 14 are arranged adjacent to each other, the steam release portion 30 and the tear portion 40 have different shapes, making it easy to distinguish them from each other. For example, by forming the steam release portion 30 so that its branched, approximately U-shaped ends 31, 32 extend in the opposite direction to the pulling direction to peel the steam seal 50, the opening 33 formed starting from the steam release portion 30 can be kept small. This prevents damage to the sheet body 10 caused by peeling the steam seal 50. For example, by forming the tear portion 40 so that its branched, approximately inverted U-shaped ends 41, 42 extend in the pulling direction to peel the tear seal 60, it is possible to easily create a slit 44 originating from the ends 41, 42. This allows the packaging bag 1 to be opened more smoothly.

[0069] The packaging bag 1 of this embodiment further includes a tear-off tape 70 that extends in a direction perpendicular to the direction in which the steam seal 50 and the tear-off seal 60 are aligned and passes through the area of ​​the sheet body 10 where the tear-off seal 60 is attached.

[0070] As a result, even if the slit 44, which is generated on the extension of the end portion on the other longitudinal side L2 of the ends 41, 42 of the tearing portion 40, progresses toward the tearing tape 70, the slit 44 will not make any further inward cut when it comes into contact with the tearing tape 70, but will progress along the tearing tape 70. Therefore, the slit 44 can be secured without disappearing.

[0071] The present invention is not limited to the above-described embodiment, and can be modified as appropriate.

[0072] In the above embodiment, the steam release portion 30 is formed in a U shape, and the tear portion 40 is formed in an inverted U shape, but there are no particular limitations on the shapes of the steam release portion 30 and the tear portion 40. For example, the steam release portion 30 and the tear portion 40 may be V-shaped, inverted V-shaped, or U-shaped, and may be a through-hole that penetrates the surface 11 of the sheet body 10, a punched hole, or a simple cut.

[0073] In the above embodiment, the steam seal 50 and the tear seal 60 are formed by a single sealing member 5, but the steam seal 50 and the tear seal 60 may each be formed by a separate sealing member.

[0074] In the above embodiment, one tear tape 70 is formed to extend in the longitudinal direction L and pass through the tear-side region 14, but two or more tear tapes 70 may be formed.

[0075] In the above embodiment, the steam seal 50 and the tear seal 60 are rectangular, but the shapes are not particularly limited. For example, the steam seal 50 and the tear seal 60 may be circular or elliptical.

[0076] In the above embodiment, the entire area of ​​the steam protection part 51 is adhered to the outer surface 11b, but it is sufficient that it is adhered so as to cover at least the periphery of the steam escape part 30. For example, only the outer periphery of the steam protection part 51 may be adhered in a frame shape.

[0077] In the above embodiment, the entire area of ​​the tearing protection part 61 is adhered to the outer surface 11b, but it is sufficient if it is adhered to at least a part of the tearing piece 25 and also adhered so as to cover the periphery of the tearing part 40. For example, only the outer periphery of the tearing protection part 61 may be adhered in a frame shape.

[0078] In the above embodiment, the steam escape portion 30 and the opening portion 40 were formed on the front surface 11, but the steam escape portion 30 and the opening portion 40 may also be formed on the back surface 12, and the sealing member 5 may be attached to the back surface 12 so as to cover the steam escape portion 30 and the opening portion 40.

[0079] In the above embodiment, the steam release portion 30 and the tear portion 40 are formed in the center of the sheet body 10 in the longitudinal direction L, but the positions of the steam release portion 30 and the tear portion 40 on the sheet body 10 are not particularly limited. For example, the steam release portion 30 and the tear portion 40 may be formed near the end of one longitudinal side L1 of the sheet body 10, or near the end of the other longitudinal side L2. By forming the tear portion 40 near the end of one longitudinal side L1 of the sheet body 10, a wide opening 43 can be obtained after opening.

[0080] In the above embodiment, the steam side region 13 and the opening side region 14 are formed adjacent to each other in the short-side direction W, but the steam side region 13 and the opening side region 14 may be formed adjacent to each other in the longitudinal direction L. In this case, for example, the opening portion 40 may be U-shaped or inverted U-shaped, and the opening tape 70 may be arranged to extend in the short-side direction W of the sheet body 10 and pass through the region where the opening seal 60 covering the opening portion 40 is affixed.

[0081] In the above embodiment, the steam release portion 30 and the tearing portion 40 are formed on the same surface of the sheet body 10, but they may be formed on different surfaces of the sheet body 10. Details of this modification will be described with reference to Figs. 9 and 10. Fig. 9 is a plan view of a packaging bag 1A of the modification, and Fig. 10 is a rear view of the packaging bag 1A of the modification. Note that the strip-shaped sheet portion 80 is not shown in Figs. 9 and 10.

[0082] The packaging bag 1A of the modified example differs from the packaging bag 1 of the above embodiment in the positions of the steam release portion 30, tear portion 40, steam seal 50, tear seal 60, and tear tape 70.

[0083] 9, in the packaging bag 1A, the steam release portion 30 is formed near the end of the other side W2 in the short side direction on the front surface 11, and the steam seal 50 is attached to the outer surface 11b so as to cover the steam release portion 30. Also, as shown in FIG. 10, in the packaging bag 1A, the tearing portion 40 is formed near the end of the other side W2 in the short side direction on the back surface 12, and the tearing seal 60 is attached to the outer surface 12b so as to cover the tearing portion 40. Also, the tearing tape 70 extends in the longitudinal direction L and is attached to the inner surface 12a so as to pass through the area where the tearing seal 60 is attached. The sealing member 5 is attached to both the outer surfaces 11b, 12b across the front surface 11 and the back surface 12. That is, in the packaging bag 1A, the steam seal 50 and the tearing seal 60 are attached so as to be adjacent to each other, but the steam release portion 30 and the tearing portion 40 are formed on different surfaces of the main sheet body 10. [Explanation of symbols]

[0084] 1 packaging bag 10 Seat body 11b External surface 30 Steam vent 40 Opening part 50 Steam seal 60 Opening seal

Claims

1. A bag-shaped sheet body, a steam escape portion formed in the seat body and communicating the inside and outside of the seat body; a tear-opening portion formed in the sheet body and communicating the inside and outside of the sheet body; a steam seal attached to the outer surface of the sheet body so as to cover the steam escape portion; a tear seal attached to the outer surface so as to cover the tear portion and peelable separately from the steam seal; the steam seal and the tear seal are adjacent to each other; the steam seal and the tear seal are formed by a single sealing member, The packaging bag has a line of weakness that divides the sealing member into the steam seal and the tear seal.

2. The packaging bag according to claim 1 , wherein the steam release portion and the tear-open portion are formed on the same surface of the sheet body.

3. The packaging bag according to claim 1 or 2, wherein the weakened line portion is a perforation formed by alternating through-portions that penetrate the sealing member and non-through-portions that do not penetrate the sealing member, or a half cut formed by removing a portion of the sealing member in the thickness direction.

4. The vapor release portion is formed by a notch having a substantially U-shape in plan view, The packaging bag according to any one of claims 1 to 3, wherein the tearing portion is formed by a cut having a substantially inverted U shape in a plan view.

5. 5. The packaging bag according to claim 1, further comprising a tear-off tape extending in a direction perpendicular to the direction in which the steam seal and the tear-off seal are aligned and passing through the area of ​​the sheet body where the tear-off seal is attached.

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