JP7157612B2 - Heat-treated packaging bag, method for manufacturing heat-treated packaging bag, and food for microwave oven - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat-treated packaging bag containing various foods and used for cooking in a microwave oven or the like, a method for manufacturing the heat-treated packaging bag, and foods for microwave use.

2. Description of the Related Art Conventionally, a heat treatment packaging bag for heat-treating an object to be heated (for example, food for microwave ovens) is known. In such a heat treatment packaging bag, the object to be heated (for example, frozen food) housed inside can be heat treated in a microwave oven or the like in a sealed state, and when the internal pressure rises due to heating, By opening a predetermined position and releasing the pressure, the packaging bag can be prevented from bursting. Such a heat-treated packaging bag is usually made of a heat-resistant plastic material. , is known to be composed of a palm-to-palm portion with an easily peelable tape interposed therebetween.

The palm-to-arm part divides the plastic film forming the side surface of the bag body into two parts, folds the end of one plastic film, and overlaps the folded end of the other plastic film with the folded part. It is constructed by interposing an easily peelable tape when welding the parts. By placing the heat-treated packaging bag in the microwave oven so that the palm-joint part faces upward, when the internal pressure increases, steam can escape from a part of the palm-joint part (steaming part). You can cook without the bag bursting.

Moreover, as a heat treatment packaging bag used for a microwave oven, it is known to use a material made of paper as disclosed in Patent Document 2, for example. Such a paper material can also be steamed when the internal pressure increases during heat treatment by configuring it with a palm-joint portion as disclosed in the above-mentioned Patent Document 1. .

Japanese Patent Application Laid-Open No. 2000-185777 Japanese Patent Application Laid-Open No. 2004-237994

In the above-described configuration in which vapor is passed through the palm-joint portion, it is necessary to accurately manage the position of the easily peelable tape interposed in the overlapped portion. Normally, when manufacturing a heat-treated packaging bag using a plastic material, the material (sheet member) is pulled out from a raw material rolled into a roll, and the sheet member is folded into a predetermined shape along the conveying direction to form an overlapped portion. It has a manufacturing process of forming, interposing an easily peelable tape in the process, and heat-sealing with a heat bar.

In this case, in the step of interposing the easily peelable tape between the overlapped portions, the easily peelable tape moving along the conveying direction may shake in a direction perpendicular to the conveying direction. Since there is a possibility that the vapor permeation function at the palm-joint portion is affected, marking lines along the conveying direction are formed in advance on the easily peelable tape. In other words, since the position of the marking line of the easily peelable tape in the overlapped portion of the transparent plastic material can be visually observed, misalignment of the easily peelable tape during manufacturing can be immediately detected, and the final As for the product, it is possible to easily and reliably inspect the product by confirming the position of the marking line.

However, if the heat treatment packaging bag is made of a material that does not transmit light, for example, a paper material, the above marking line cannot be visually recognized in the process of interposing the easily peelable tape between the overlapping parts. As a result, problems arise in that manufacturing defects occur and that a heat-treated packaging bag having a stable steaming function cannot be obtained.

The present invention has been made by paying attention to the above-described problems, and includes a heat-treated packaging bag having a vapor passage section in which an easily peelable tape is stably interposed, a method for manufacturing a heat-treated packaging bag, and an electronic device. The purpose is to provide microwaveable foods.

In order to achieve the above object, the present invention provides a main body portion having a storage portion capable of storing an object by stacking sheet members formed of a material that does not transmit light and welding the periphery thereof, and the main body portion. A heat treatment packaging bag having a superimposed portion formed in a part of the portion and allowing steam to pass when the internal pressure of the accommodating portion increases due to the interposition of an easily peelable tape, wherein the superimposed portion of the sheet member 1) forming an exposed portion for exposing a portion of the easily peelable tape interposed in the overlapped portion.

The heat-treated packaging bag having the above structure is subjected to heat treatment in a microwave oven, and when the internal pressure of the container increases, steam is passed through the overlapped portion where the easily peelable tape is interposed. If the position of the easily peelable tape is not appropriate, manufacturing defects may occur, or it may not be possible to exhibit a stable vapor permeation function. Since the portion is exposed, even if the sheet member is made of a material that does not transmit light, it is possible to easily check whether the position of the easily peelable tape is misaligned. As a result, the possibility of problems occurring during production is reduced, and a heat-treated packaging bag having a stable steaming function can be obtained.

Further, in order to achieve the above object, the present invention provides a main body portion having a storage portion capable of storing a stored object by stacking sheet members formed of a material that does not transmit light and welding the periphery thereof, In the method for manufacturing a heat-treated packaging bag, the method for manufacturing a heat-treated packaging bag includes a superimposed portion formed in a part of the main body portion and through which steam is passed when the internal pressure of the accommodating portion increases due to the interposition of an easily peelable tape, wherein the sheet member A step of folding a part of the sheet member while pulling it out from the rolled raw material to form the overlapped portion, a step of interposing an easily peelable tape in the overlapped portion formed on the sheet member, and the easy peeling a step of heat-sealing the overlapped portion in which the adhesive tape is interposed with a heat bar, and exposing a portion of the easily peelable tape interposed in the overlapped portion prior to the step of heat-sealing. It is characterized in that an exposed portion is formed in the overlapped portion.

In the method for manufacturing a heat-treated packaging bag described above, in the manufacturing process of heat-sealing the overlapped portion with a heat bar, if the position of the easily peelable tape interposed in the overlapped portion is misaligned, the state can be immediately visually observed. Therefore, by correcting the intervening position of the easily peelable tape to an appropriate position, it is possible to suppress the occurrence of defects during manufacturing. In addition, a heat-treated packaging bag exhibiting a stable steaming function can be obtained.

Further, in order to achieve the above-described object, the present invention provides a main body portion having a storage portion in which a stored object is stored, and an easily peelable tape formed in a part of the main body portion and interposing the above-mentioned tape. A food product for a microwave oven, which has a superimposed portion that allows steam to pass through when the internal pressure of the container increases, and is formed of a light-impermeable material, wherein a portion of the easily peelable tape is exposed in the superimposed portion. It is characterized by forming an exposed portion.

In such a food product for microwave ovens, it is possible to easily grasp whether the position of the easily peelable tape interposed in the overlapping portion is in an appropriate state. A food for microwave oven is obtained through steaming.

According to the present invention, even if the sheet member is made of a material that does not transmit light, it can be easily confirmed that the easily peelable tape interposed in the overlapped portion is disposed at an appropriate position. Therefore, it is possible to obtain a heat-treated packaging bag exhibiting a stable steaming function and food for microwave ovens. In addition, the present invention makes it possible to easily manufacture a heat-treated packaging bag having such functions.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows 1st Embodiment of a heat-processing packaging bag (food for microwave ovens). The figure which shows the outline of the manufacturing process of the heat-processing packaging bag shown in FIG. (a) is a diagram showing a state in which a sheet member pulled out from a raw material is folded to form an overlapped portion in the manufacturing process shown in FIG. The figure which shows a structure. The perspective view which shows 2nd Embodiment of a heat-processing packaging bag (food for microwave ovens).

FIG. 1 is a diagram showing a first embodiment of a heat-treated packaging bag (hereinafter referred to as packaging bag) according to the present invention.
The packaging bag 1 of this embodiment includes a body portion 3 in which substantially rectangular sheet members 3A and 3B are superimposed and both sides 3a and 3b and a bottom portion 3c (periphery) are welded together. constructed as a body. In this case, as will be described later, the packaging bag 1 is made by pulling out one sheet member 3S (see FIGS. 2 and 3) from a roll-shaped raw material, folding it at an appropriate place to overlap it, and welding the periphery. It is configured. Therefore, since the upper portion 3d facing the bottom portion 3c is closed by folding back one sheet member, it is not welded (it may be welded).
In addition, the packaging bag 1 of the present embodiment is composed of one sheet member 3S, and one side is defined as the sheet member 3A and the other side is defined as the sheet member 3B. sheet members are stacked and the periphery thereof is welded.

As described above, by welding the peripheries of the overlapping sheet members (the welded portion is indicated by oblique lines), the storage portion S in which the content is stored is formed. In the packaging bag having such a configuration, the bottom portion 3c is left unwelded, and after the container portion S is filled with food or the like from this portion, the bottom portion 3c is welded to produce food for microwave ovens. It is possible. Alternatively, by leaving the bottom portion 3c in an unwelded state and providing a sealing chuck (fastener) in the vicinity thereof, it is possible to make a packaging bag that can be used in a microwave oven.

The sheet members 3A and 3B are made of a material that does not transmit light. As a sheet member that does not transmit light, for example, the base material is paper (paper base material), a non-metallic barrier layer with barrier properties is integrated on the inner surface, and a heat-weldable resin is applied on the barrier layer. It can be configured by laminating a protective layer (adhesion layer) made of The protective layer can be formed, for example, by laminating a polyethylene-based or polypropylene-based resin or the like. Instead, the protective layer prevents the non-metallic barrier layer from coming off or deteriorating, so that the barrier property of the sheet body can be maintained for a long period of time, and the sheet members can be thermally welded together during bag making. Become.

Various base papers (general vegetable fiber, etc.) can be used as the paper base material, and PVA (polyvinyl alcohol), etc., which has a barrier effect, can be used as a constituent material of the non-metallic barrier layer. materials can be used. The non-metallic barrier layer and the protective layer can be laminated and integrated with the paper substrate.
In this case, as a sheet member that exhibits the functions described above, for example, Nippon Paper Industries Co., Ltd.'s "Shield Plus (registered trademark) Premier" can be used, and such a material is a paper base material. It is possible for the non-metallic barrier layer adhered to to exhibit a barrier function (gas barrier property, moisture resistance, aroma retention property, etc.). In addition, it is preferable to coat (laminate) an outer layer coated with a resin (polyethylene-based or polypropylene-based resin, etc.) on the outer surface side of the paper base material so as to prevent permeation of moisture.

Alternatively, the sheet members 3A and 3B that do not transmit light can be made of a heat-resistant plastic material (plastic film) that is used as a food packaging material that is heated in a microwave oven. For example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyamide resins such as nylon, and polyolefin resins such as polypropylene and polyethylene can be used as base materials, and can be heat-welded to the inner surface of the base material. For example, a sheet member obtained by laminating a polyethylene-based resin such as low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE), a polypropylene-based resin, or the like may be used. In addition, such a sheet member may be formed with various printed layers (printed layers that do not transmit light) or barrier layers as described above. method, for example, using an extruder, etc., to form a film of molten resin to form layers in the form of a laminate, or to create a film that has been formed in advance using a lamination method such as dry lamination. is possible.

A part of the body portion 3 is formed with an overlapping portion (a palm-to-palm portion) 4 with an easily peelable tape 7 interposed therebetween. The overlapped portion 4 is formed on one side surface of the main body portion 3 at a position slightly above an intermediate portion, extending across the width direction of the side surface, and is formed so as to protrude from the side surface. The superimposed portion 4 can be composed of the sheet members 3A and 3B. It has a function to let

The easily peelable tape 7 interposed in the polymerized portion may be any resin having a function that allows the polymerized portion to be peeled off when a certain pressure is applied. It can be composed of a polypropylene mixture, a resin mixture containing these resins, or the like, and is not limited to a specific material as long as it is used as an easily peelable plastic. The easily peelable tape 7 is visible from the outside while interposed in the overlapping portion 4, and is preferably colored or patterned so as to be easily visible.
In this embodiment, as shown in FIG. 3(b), a linear line (marking line) 7a is added along the longitudinal direction so that positional deviation can be easily recognized.

The overlapped portion 4 is formed with an unwelded portion 8 so that steam can be smoothly passed when the internal pressure of the accommodating portion S is increased. The unwelded portion 8 is formed in a substantially central region of the overlapped portion 4 so as to form a substantially semicircular shape from the edge 4a of the overlapped portion 4. By forming such an unwelded portion 8, it is possible to accommodate The close contact distance between the portion S and the edge portion 11 is shortened, and when the internal pressure increases, steam can be passed through the region (to be the steam passing portion) 8a of the unwelded portion 8 on the accommodation portion side. . For such a non-welded portion 8, a semi-circular recess (non-welded region) is formed in the heat bar for heat-sealing the overlapped portion 4 used in the bag making process in a substantially intermediate region of the overlapped portion 4. It is possible to create it by keeping That is, even if the overlapped portion 4 is pressure-bonded with a heat bar, that portion is not welded, and an unwelded portion 8 is formed.

In addition, the overlapped portion 4 is formed with an exposed portion that exposes a portion of the intervening easily peelable tape 7 . The exposed portion of the present embodiment is composed of a hole (opening) 10 formed in the outer (viewing side) surface of the overlapped portion 4, and the easily peelable tape 7 is exposed through the hole 10. I am letting In this case, the position, shape, and number of the holes 10 to be formed are not limited, but in the present embodiment, they are formed at two locations on both sides of the unwelded portion 8, and as described above, Since the marking line 7a is attached to the easy peeling tape 7, the marking line 7a is formed to be exposed. That is, the position of the exposed portion (hole 10) can be appropriately changed according to the position of the marking line 7a attached to the easily peelable tape 7. FIG.

As described above, the main body portion 3 and the overlapping portion 4 are made of a material that does not transmit light. Although 7 cannot be visually recognized, the position of the easily peelable tape can be confirmed by forming the exposed portion (hole 10). Therefore, even if the easily peelable tape 7 supplied to the gap of the overlapping portion is shaken during bag making, the state can be grasped. A packaging bag 1 having a steaming function is obtained.

Next, a method for manufacturing the above packaging bag 1 will be described with reference to FIGS. 2 and 3. FIG.
Since the packaging bag 1 of the present embodiment can be manufactured using a generally known bag-making machine, the main features Parts will be illustrated and described.

The one sheet member 3S described above is supplied to a bag making machine in a roll shape (original fabric), and sequentially processed (bending, welding, cutting, etc.) along the pull-out direction D1. Two packaging bags 1 are manufactured continuously.

As shown in FIG. 3, both sides of a single sheet member 3S pulled out from a raw sheet in the conveying direction are folded back three times, 180° inward, 180° outward, and 180° inward (each folded portion is 20, 21, 22). In this folding process, the lower folded portion 20 constitutes the upper portion 3d of the packaging bag shown in FIG. 1, and the overlapping portion 23 formed by the upper folded portion 22 forms the overlapping portion 4 of the packaging bag shown in FIG. configure. In this case, the folded portion 22 on the upper side is folded back at a position inside the folded portion 20 on the lower side.
The front side surfaces 20a and 22a formed by the folded portions 20 and 22 constitute one side surface (sheet member 3A) of the packaging bag, and the back flat surface 25 constitutes the other side surface (sheet member 3B) of the packaging bag. Configure. Both end edges 26 of the sheet member 3S folded as described above are butted against each other, and these end edge portions constitute the bottom portion 3c of the packaging bag shown in FIG.

The folding process described above is performed by passing the sheet member 3S through the guide members while conveying it in the pull-out direction. Further, at the time of drawing and conveying, the holes 10 are continuously formed at predetermined positions on the front side surface 22a of the overlapping portion 23 formed by the folded portion 22. As shown in FIG. Also, the easily peelable tape 7 is conveyed so as to be drawn into the overlapped portions 23 on both sides that have been folded back by the folding step described above. Note that the step of forming the hole 10 may be performed before the overlapped portion 4 is thermally welded (longitudinal seal), and the timing thereof is not limited. For example, it may be formed before or after the folding process described above, or in advance from the original sheet.

After the easily peelable tape 7 is conveyed and interposed in the overlapping portion, vertical sealing along the conveying direction and horizontal sealing are performed by a heat bar. Vertical sealing is performed to form the overlapping portion 4 and the unwelded portion 8 described above, and is performed so that the holes 10 formed before welding are positioned on both sides of the unwelded portion 8 in the intermediate region. Further, transverse sealing is performed to form both sides 3a, 3b of the packaging bag. Further, after the above-described vertical sealing is performed, a step of cutting the upper folded portion 22 is performed in the overlapped portion 4 so that steam can be passed through the unwelded portion 8 . This cutting process may be performed before the horizontal sealing is performed, or may be performed after that.

Then, by cutting the flat surface 25 on the back side along both edges 26 of the sheet member 3S, two packaging bags are simultaneously manufactured on both sides in the conveying direction. The bottom portion 3c of the manufactured packaging bag 1 is not welded, and food, seasonings, etc. are filled from this portion and heat-sealed to complete the food for microwave oven.

When the contents are stored in the packaging bag manufactured as described above and heat-treated in a microwave oven to increase the internal pressure of the storage part, the overlapped part 4 with the easily peelable tape 7 interposed is not welded. Vaporization is performed in the part of part 8. In this case, if the position of the easily peelable tape 7 is not appropriate, manufacturing problems may occur, and a stable vapor passage function cannot be exhibited. Since a part of the easy peeling tape is exposed, it is possible to easily check whether the position of the easy peeling tape is correct even if the sheet member is made of a material that does not transmit light. becomes. As a result, the possibility of problems occurring during production is reduced, and a heat-treated packaging bag having a stable steaming function can be obtained. In particular, in the present embodiment, the marking line 7a is formed and exposed through two holes 10 spaced apart by a certain distance, making it possible to easily check the misalignment.

In the manufacturing process described above, when the overlapped portion 4 is heat-sealed with a heat bar, if the position of the easily peelable tape 7 is misaligned, the state can be immediately visually observed through the exposed portion (hole 10). By correcting the intervening position of the adhesive tape 7 to an appropriate position, it becomes possible to suppress the occurrence of defects during manufacturing. In addition, since it is possible to visually confirm whether or not the easily peelable tape is welded at an appropriate position on the completed packaging bag, the inspection work can be easily performed.

FIG. 4 shows a second embodiment of the packaging bag.
In the above-described first embodiment, the exposed portion for exposing the easily peelable tape is formed of a hole, but as shown in FIG. It is possible. The notch 10A may be any one that exposes the easily peelable tape 7 (preferably, exposes the marking line 7a), and as shown in the figure, is cut out in a substantially semicircular shape. Such a notch 10A can be formed at any position of the edge 4a, but is preferably formed corresponding to the non-welded region formed on the heat bar for vertical sealing.

As described above, the non-welding region of the heat bar is a region to which heat is not applied, and since the non-welding portion 8 (see FIG. 1) is formed in the overlapped portion, the notch 10A should be formed in this position. Therefore, heat is not applied to the easily peelable tape 7 in the exposed state. That is, during vertical sealing, the heating part of the heat bar does not come into contact with the easily peelable tape 7, and the exposed portion of the easily peelable tape 7 is not wrinkled or melted. This makes it possible to obtain a clean finish and to reliably grasp misalignment. Moreover, since such a notch 10A exhibits a function as an unwelded portion, a vapor passage portion 8a is formed in the same manner as in the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

In the above-described configuration, the sheet member can be arbitrarily set according to the form of the items to be stored. The sheet member may be made of a material that does not transmit light and has a structure in which a weldable resin is formed into a film, and the material is not limited to those described above. For example, it may have a structure including a layer having functions such as gas barrier properties, mechanical toughness, puncture resistance, impact resistance, and abrasion resistance. In this case, by using paper as the base material for the sheet member, it is possible to improve the texture by selecting various types of base paper, as well as being environmentally friendly and easy to process.

In addition, although the packaging bag has been described as a trihedron, it can be modified as appropriate, such as a gusset type with gussets on the sides, or a self-supporting body with a bottom wall. Furthermore, the main body may be formed with an unsealable zipper, or the like, so that the user can fill the bag with his/her favorite food. It is possible to change variously about the formation position.

1 heat treatment packaging bag 3 main body 3A, 3B sheet member 4 overlapped portion 7 easily peelable tape 7a marking line 10 hole (exposed portion)
10A notch (exposed part)

Claims (3)

A main body portion having a storage portion capable of storing a stored object by stacking sheet members formed of a material that does not transmit light and welding the periphery thereof, and an easily peelable tape formed on a part of the main body portion. A heat-treated packaging bag having a superposed portion that allows steam to flow when the internal pressure of the accommodating portion increases due to the interposition of the heat-treated packaging bag,
The easily peelable tape has a marking line along the longitudinal direction,
A notch having a function of forming an unwelded portion and allowing steam to pass through is formed at the edge of the overlapped portion,
The heat-treated packaging bag, wherein the overlapping portion has holes for exposing the marking line on both sides of the unwelded portion. 2. The heat treatment packaging bag according to claim 1, wherein the sheet member is made of paper material. 3. A food for microwave oven, wherein a content is accommodated in the accommodation portion of the body portion of the heat treatment packaging bag according to claim 1 or 2.

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