JP2023119054A - standing pouch - Google Patents

Abstract

To provide a standing pouch equipped with an automatic vapor removal mechanism capable of discharging vapor generated from a content by heat-cooking, which is easy to open, has excellent linearity of a cut and is capable of holding an opening shape of an opening in a pouch which can heat-cook the content by a microwave oven and has self-standing property.SOLUTION: A pouch is composed of a plastic film laminate and can perform heat-cooking by a microwave oven. A plastic film layer on an outermost layer side of the laminate uses the polyethylene terephthalate film. An intermediate film layer of the laminate is a layer adjacent to a sealant layer, and uses a polyethylene terephthalate film having linear cutting property in a horizontal direction of a pouch trunk. A sealant layer on an innermost layer side of the laminate is a polypropylene resin layer having the linear cut property in the horizontal direction of the pouch trunk.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a pouch suitable for cooking with a microwave oven. In particular, a pouch in the form of a standing pouch, which has a bottom plate and is self-supporting, is equipped with an automatic steam venting mechanism capable of discharging the steam generated from the contents during cooking, and is opened. The present invention relates to a standing pouch that is easy to open, has excellent straightness of the cut end, and can maintain the opening shape of the opening.

Pouches, which are a type of packaging material, are widely used, consisting of single or laminated plastic film-based pouches. has become indispensable for

Pouches are also used, for example, as containers for liquids, and are widely used in the food field such as beverages and retort pouches. In addition, various products such as daily necessities and toiletries are displayed on the shelves of supermarkets, drug stores, and convenience stores. Bustling. In addition to liquid containers, it has been developed for various uses.

The advantages of pouches are that they are cheaper than containers such as cans and bottles, that they can be handled with detailed material design according to the required quality, and that they are lightweight and space-saving before filling the contents, and during distribution and storage. Things are mentioned. Pouches can also be said to be environmentally friendly from the standpoint of reducing waste.

In addition, high-definition printing on the layer visible from the outside of the pouch can improve the image of the product, and it is possible to display necessary information about the contents. It also serves as a source of information, inventory management, and marketing information.

Among pouches, self-supporting pouches have also been commercialized and are generally called standing pouches. In addition to being advantageous in displaying and presenting products, it is also advantageous in terms of usability by allowing it to stand on its own.

Furthermore, when opening the standing pouch after cooking, importance is attached to the prevention of burns caused by residual steam, the ease of opening the opening, and the retention of the shape of the opening.

For example, if the contents of the pouch are food, and the pouch is to be taken out directly from the pouch using tableware such as a spoon or fork and eaten, the opening should be kept open without being closed. Dripping is desirable. At the same time, it is preferable that the opening for unsealing is cut linearly at a predetermined position.

Patent Document 1 proposes a standing pouch that is self-supporting when filled with a content. The shape retention function, the shape and straightness of the cut end were not taken into consideration.

JP 2006-96388 A

The present invention has been made in view of such circumstances, and is a self-standing pouch that allows the contents to be cooked in a microwave oven. To provide a standing pouch which has an automatic vapor venting mechanism capable of opening the pouch, is easy to open, has excellent linearity of the cut end, and can maintain the opening shape of the opening.

As a means for solving the above problems, the invention according to claim 1,
A pouch made of a laminate of plastic films and capable of being heated and cooked in a microwave oven,
The laminate is composed of a plastic film layer on the outermost side of the pouch, an intermediate film layer, and a sealant layer on the innermost side of the pouch.
The pouch is made so that the contents can be accommodated by the front side body part, the rear side body part, and the bottom film disposed therebetween,
The pouch is equipped with an automatic steam vent mechanism that can discharge the steam generated from the contents during cooking with a microwave oven.
The front trunk and the rear trunk have four sides and are arranged with the sealant layers facing each other,
Of these four sides, both left and right ends of the body are sealed, and both ends of the pouch are sealed,
At the bottom of the body, a bottom film is folded and arranged between the front body and the back body, and the lower end of the pouch is sealed and sealed with the body such that the bottom film forms the bottom surface. and
In the upper body part, the front body part and the rear body part are sealed at the upper end of the pouch after containing the contents, so that the entire pouch can be sealed,
At least one of the sealing portions at both ends of the body is provided with a notch, and the horizontal straight line of the body on the front and back of the pouch with this cut as a starting point is the planned opening line,
The plastic film layer on the outermost layer side of the laminate uses a polyethylene terephthalate film,
The intermediate film layer of the laminate is a layer adjacent to the sealant layer, and uses a polyethylene terephthalate film having a straight cut property in the horizontal direction of the pouch body,
The standing pouch is characterized in that the sealant layer on the innermost layer side of the laminate is a polypropylene resin layer having linear cuttability in the horizontal direction of the pouch body.

In addition, the invention according to claim 2,
Claim 1, characterized in that the notch is provided at a position between the height of the surface of the contents and the sealing portion at the upper end of the pouch when the pouch stands on its own after containing the contents. It is a standing pouch described in.

In addition, the invention according to claim 3,
3. The standing pouch according to claim 1 or 2, wherein the sealant layer is a laminated polypropylene resin film having a linear cutting property in the horizontal direction of the pouch body.

Further, the invention according to claim 4,
The automatic steam venting mechanism is characterized in that during cooking with a microwave oven, steam is generated from the contents, and a part of the sealed portion of the pouch is peeled off to allow steam to pass through. A standing pouch according to any one of the above.

In addition, the invention according to claim 5,
5. The standing pouch according to any one of claims 1 to 4, wherein the polyethylene terephthalate film of the plastic film layer of the laminate is provided with an inorganic compound deposition film on its surface.

In addition, the invention according to claim 6,
The standing pouch according to any one of claims 1 to 5, wherein the intermediate film layer of the laminate further comprises a polyamide film having a straight cutting property in the horizontal direction of the pouch body. .

In addition, the invention according to claim 7,
7. The polyethylene terephthalate film of the intermediate film layer of the laminate is provided with a scratched line along the planned opening line of the pouch body. It is a standing pouch described in.

Further, the invention according to claim 8 is
The standing pouch according to any one of claims 1 to 7, characterized in that the scratched lines are provided by perforations or half-cut lines.

Further, the invention according to claim 9 is
9. The standing pouch according to claim 8, wherein the scratched lines are perforations or half-cut lines.

According to the present invention, a self-supporting pouch capable of cooking contents in a microwave oven is provided with an automatic steam release mechanism capable of discharging to the outside steam generated from the contents during cooking. Also, it is possible to provide a standing pouch that is easy to open, has excellent straightness of the cut end, and is capable of retaining the opening shape of the opening.

The stand-up pouch is self-supporting because the bottom film is sealed so that the bottom surface can be formed and the lower part of the pouch is formed. It has the convenience of taking out the contents.

In addition, by having an automatic steam release mechanism, it is possible to eliminate problems such as the internal pressure inside the pouch rising due to steam generated from the contents during cooking, leading to bag breakage and steam blowing out when opened. be.

At least one of the sealing portions at both ends of the body is provided with a notch, and starting from this notch, the horizontal straight line of the body on the front and back of the pouch is the intended opening line, thereby starting the opening. Work can be done more easily.

Furthermore, the intermediate film layer of the laminate is a layer adjacent to the sealant layer, and uses a polyethylene terephthalate film having a straight cut property in the horizontal direction of the pouch body, and the sealant layer on the innermost layer side of the laminate is A standing pouch that is easy to open, has excellent linearity of the cut end, and can maintain the opening shape of the opening because it is a polypropylene resin layer that has a straight cut property in the horizontal direction of the pouch body. is possible.

In particular, according to the second aspect of the invention, the slit is formed at a position between the height of the surface of the contents and the sealing portion at the upper end of the pouch when the pouch is made to stand on its own after containing the contents. As a result, when the pouch is opened by tearing the slit as a starting point, the tearing can be performed more smoothly without causing problems such as the contents spilling out of the pouch.

In addition, since it is possible to take out the contents from the opening while maintaining the shape of the opening, it is possible to make it easier by using tableware such as chopsticks and spoons. .

Further, particularly according to the third aspect of the invention, the sealant layer is provided with linear cuttability in advance by laminating a polypropylene resin film having linear cuttability in the horizontal direction of the pouch body. Since layers can be formed using films, it is possible to provide a more stable laminate with good production efficiency, that is, a standing pouch.

In particular, according to the fourth aspect of the invention, the automatic steam venting mechanism is a mechanism in which a part of the sealed portion of the pouch is peeled off and steamed by steam generation from the contents during cooking with a microwave oven. By adopting , it can be realized by a method within the scope of the conventional manufacturing process, such as a method such as bending or bending a part of the seal shape of the pouch, or partially weakening the seal strength. A separate member is not required, and there is no fear that the cost will be greatly reduced.

In particular, according to the fifth aspect of the invention, the polyethylene terephthalate film of the plastic film layer of the laminate is provided with an inorganic compound vapor deposition coating on the surface thereof, so that gas barrier performance is imparted. It is possible to improve the storage stability of the contents and to eliminate the influence of the storage environment on the contents.

In particular, when an inorganic compound deposition film is provided on the surface of a polyethylene terephthalate film as a gas barrier film, it is excellent compared to the fact that a gas barrier layer made of metal foil such as aluminum foil is not suitable for cooking with microwave ovens. there is

In addition, when AlOX or the like is used for the inorganic compound deposition coating, the contents can be seen from the outside of the pouch due to its transparency.

Moreover, according to the sixth aspect of the invention, the polyethylene terephthalate film of the plastic film layer of the laminate is an intermediate polyethylene terephthalate film, so that the stretch-balanced portion is selectively used. Therefore, it is effective in realizing a more stable straight cutting property even in opening by tearing.

Moreover, particularly according to the seventh aspect of the invention, the intermediate film layer of the laminate further includes a polyamide film having a straight cutting property in the horizontal direction of the pouch body, thereby affecting the tearability. Therefore, a standing pouch having excellent mechanical strength can be obtained.

Further, particularly according to the eighth aspect of the invention, the polyethylene terephthalate film of the intermediate film layer of the laminate is provided with a scratched line along the planned opening line of the pouch body, Since it works as a mechanism that assists straight cutability, it is effective in achieving easier and more stable straightness even in opening by tearing.

In addition, according to the ninth aspect of the invention, the scratched line is provided by perforations or half-cut lines, so that it works as a mechanism for assisting straight cutability, so it is difficult to open by tearing. is also easier and effective in achieving more stable linearity.

FIG. 1 is a schematic plan view (partially see-through) for explaining one embodiment of a standing pouch related to the present invention. FIG. 2 is a perspective (partially see-through) schematic diagram for explaining an unsealed state in one embodiment of the standing pouch related to the present invention. FIG. 3 is a schematic plan view showing an external shape and dimensions for explaining an example of a standing pouch related to the present invention and a comparative example. FIG. 4 is a schematic partial cross-sectional view of a laminate constituting the pouch for explaining Example 1 of the standing pouch according to the present invention. FIG. 5 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Example 2 of the standing pouch according to the present invention. FIG. 6 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Example 3 of the standing pouch according to the present invention. FIG. 7 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Example 4 of the standing pouch according to the present invention. FIG. 8 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Comparative Example 1 of the standing pouch according to the present invention. FIG. 9 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Comparative Example 2 of the standing pouch according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 9. FIG. However, the invention is not limited to the examples shown here. The invention is limited by the claims.

FIG. 1 is a schematic plan view (partially see-through) for explaining one embodiment of a standing pouch related to the present invention.

The present invention is a standing pouch (100) composed of a laminate using a plastic film, and the laminate includes a plastic film layer on the outermost layer side of the pouch, an intermediate film layer, and a sealant layer on the innermost layer side of the pouch. Configured.

The sealant layer allows two laminates to be superimposed so that the sealant layers face each other and adhere to each other by sealing to form a pouch. For sealing, for example, heat sealing by applying heat and pressure can be used.

Among thermoplastic resins, polyolefin resins can be used as the material of the sealant layer. In addition, the sealant layer can be formed by forming a film from a melted resin using an extruder or the like to form a layer on the laminate. Alternatively, it is also possible to form a sealant layer on the surface of the laminate by laminating materials that have been formed into films in advance.

As shown in Figure 1, the standing pouch (100) is receptacleable by means of a front body (1), a back body (7) and a bottom film (10) disposed therebetween. It is made into bags.

That is, the front body (1) and the rear body (7) have four sides and are arranged with the sealant layers facing each other. 2) is sealed, and the left and right ends (2) of the pouch are sealed.

In addition, the bottom film (10) is folded along the fold line (6) between the front body (1) and the rear body (7) in the lower body part, and the lower end (3) of the pouch is placed. ) is hermetically sealed so that it can be bottomed by a bottom film (10).

The formation of this bottom surface enables the standing pouch (100) containing the contents to stand on its own. The self-reliance makes it more convenient, for example, for display and display as a product, and for cooking with a microwave oven.

In addition, in the upper body part, the front body part (1) and the rear body part (7) are sealed at the upper end part (4) of the pouch after containing the contents, and the whole standing pouch (100) is sealed. is possible.

In addition, the standing pouch (100) according to the present invention has an automatic steam release mechanism (12) capable of discharging steam generated from the contents to the outside of the pouch during cooking of the contents in a microwave oven.

This automatic steam release mechanism (12) is effective in preventing the pouch body from bursting at once due to an increase in internal pressure due to steam generated inside the pouch during cooking with a microwave oven. When opening the pouch, it is also effective in preventing the danger of steam blowing out from the inside and the resulting burns of fingers.

In the example shown in FIG. 1, the automatic steam release mechanism (12) is provided near the upper end (4) on the right side. In the present invention, the position of the automatic steam venting mechanism (12) is not limited. A suitable location is a portion facing the inner space of the pouch that is above the surface of the contents during cooking and is not in direct contact with the contents.

That is, in the example shown in FIG. 1, during cooking with a microwave oven, the space inside the pouch of the standing pouch (100) is filled with water vapor from the contents due to heating, and the volume expansion of the space containing the contents causes the standing pouch to open. (100) The whole expands and the internal pressure rises at the same time.

At this time, the volume expansion occurs radially in three dimensions from the volume center of the space inside the pouch of the standing pouch (100). In the case of (2), pressure is applied to the bent seal portion, and acts as a peeling force on the bent seal portion to the laminate on the front and back of this portion.

For example, in the example shown in FIG. 1, the pouch is sealed at the periphery, and even if volume expansion due to water vapor occurs, the substantially rectangular shape shown in FIG. It is possible to transform into a different shape.

However, this radial three-dimensional volumetric expansion tends to expand spherically as the internal pressure increases, resulting in a contradiction with the room for expansion of the substantially rectangular pouch.

In the example shown in FIG. 1, at this time, since the automatic steam vent mechanism (12) has a shape bent toward the inside of the packaging bag (100), the three-dimensional radial volume expansion causes the In the example shown, since the pressure for peeling is received more strongly than the sealing portion of the peripheral portion, the stress concentration becomes more severe in this portion, and the sealing portion of the automatic steam release mechanism (12) is peeled. will wake up.

By this peeling, the inner space and the outer space of the pouch are connected, and the water vapor inside is automatically discharged to the outside. Therefore, the internal pressure of the standing pouch (100) is abruptly reduced by this part serving as an automatic vapor venting mechanism, so that such peeling does not occur at other peripheral seals.

In addition, the automatic steam release mechanism is not limited to the examples shown here, and the internal pressure of the pouch, which rises due to the generation of steam, automatically connects the inside and outside of the pouch by partially breaking the seal. For example, other methods may be used as long as they satisfy the function of deriving water vapor to the outside.

To give an example of another method, for example, compared to the sealing part of the peripheral part, the part of the automatic steam release mechanism can be sealed with weaker sealing strength, narrower sealing width, or both. is.

For example, if the sealing strength is weaker than other sealing parts, the sealant type should be selected, the sealing conditions should be adjusted, or a layer effective for weakening should be inserted into this part during sealing. It is possible to realize by

Also, the sealed state with a narrower seal width than other seal portions can also be a weak portion, but in this case, it can be realized by adjusting the shape and width of the seal bar.

In addition, in the present invention, a cut (8) is provided in at least one of the sealing portions of the left and right ends (2) of the body, and the cut (8) is used as a starting point for the front side body (1) of the pouch. ), a planned opening line (5) can be provided as a horizontal straight line.

With this incision (8) as a starting point, the straight line in the horizontal direction of the front side body (1) of the pouch is the planned opening line (5). It is possible to more easily perform the opening operation and the subsequent opening operation. In addition, even after the package is opened, the cut end does not tear again, and the horizontal cut end can be maintained.

The example shown in FIG. 1 is an example in which a notch (8) is provided at one place on the left side edge as you face it. is indicated by a dashed line as an unsealing planned line (5). However, the planned opening line of the rear trunk part overlaps with the planned opening line of the front trunk part, and is invisible in FIG.

This incision (8) may be of V-shaped incision (8), as in the example shown in FIG. 1, or may simply be a linear incision.

In the standing pouch (100) according to the present invention, the plastic film layer on the outermost layer side of the laminate uses a polyethylene terephthalate film, and the intermediate film layer of the laminate is a layer adjacent to the sealant layer. A polyethylene terephthalate film having a straight cut property in the horizontal direction of the pouch body is used, and the sealant layer on the innermost layer side of the laminate is a polypropylene resin layer having a straight cut property in the horizontal direction of the pouch body. is characterized by

As a result of extensive studies in the process of promoting the present invention, we have found that these materials make it easy to open, have excellent straightness of the cut, and can maintain the opening shape of the opening. It has been found that a standing pouch (100) can be realized.

In this way, according to the present invention, in a self-supporting pouch that allows the content to be cooked in a microwave oven, the steam generated from the content during cooking can be discharged to the outside. It is possible to provide a standing pouch (100) that has a steam release mechanism, is easy to open, has excellent straightness of the cut end, and can maintain the open shape of the opening.

FIG. 2 is a perspective (partially see-through) schematic diagram for explaining an unsealed state in one embodiment of the standing pouch related to the present invention.

The standing pouch (100) according to the present invention is suitable for microwave cooking, and in the filled state the bottom film (10) extends between the sealed bottom edges (3). to form the bottom of the pouch, which can remain stable and free-standing.

In addition, after cooking with heat, starting from the incision (8), the front side body part opening line (5) and the rear side body part opening line (11) are cut by fingers to open the upper part of the pouch. (90) can be detached and separated.

The opening (20) formed in this manner is a portion surrounded by the planned opening line (5) of the front side trunk and the planned opening line (11) of the rear side trunk. shape is maintained.

First, the planned opening line (5) on the front side trunk and the planned opening line (11) on the back side trunk are horizontal straight cut edges, which are the outermost layer of the pouch laminate according to the present invention. The plastic film layer on the side uses a polyethylene terephthalate film, and the intermediate film layer of the laminate is a layer adjacent to the sealant layer and uses a polyethylene terephthalate film having a straight cut property in the horizontal direction of the pouch body. This is because the sealant layer on the innermost layer side of the pouch is a polypropylene resin layer that can be cut linearly in the horizontal direction of the pouch body.

In addition, as can be seen from the state in which the pouch is opened as shown in FIG. 2, the opening (20) is in a state of being wide open. In (100), the bulging shape of the space inside the pouch remains.

That is, the surplus portion of the storage space for the contents (14), which had a relatively small volume before cooking, expands due to the generation of steam, and even after the steam is removed by the automatic steam removal mechanism (12). , is the result of unsealing with the opening (20) open because the unsealing operation is performed while the volume is maintained to some extent.

If the content (14) is in a liquid or fluid state, the content (14) gathers at the bottom of the pouch, and the bottom film can form a flat bottom. The part (20) can be expanded to create a self-sustaining state, and can maintain a stable self-sustaining state during microwave cooking and after opening.

As a result of the opening (20) being kept wide open, the removal of the contents (14) of the standing pouch (100) according to the invention is easy, for example with food items, using chopsticks. It is highly convenient because it is possible to directly take it out and eat it using utensils such as a spoon or a fork.

In addition, in the present invention, the notch (8) can be provided at a position between the height of the surface of the contents and the sealing portion at the upper end of the pouch when the pouch stands on its own after containing the contents. In this case, the opening operation can be started more easily and stably with fingers starting from the notch (8).

Furthermore, the tearing of the planned opening line (5) of the front side trunk and the planned opening line (11) of the rear side trunk, which are continuous with the cut (8), is also the same. With this, it is possible to perform the horizontal opening operation more easily and stably along the planned opening line (11) on the rear trunk portion.

This is because, in the present invention, a polyethylene terephthalate film is used as the outermost plastic film layer of the laminate constituting the pouch, and the intermediate film layer of the laminate is a layer adjacent to the sealant layer, A polyethylene terephthalate film that has a straight cut property in the horizontal direction of the body is used, and the sealant layer on the innermost layer side of the pouch of the laminate is a polypropylene resin layer that has a straight cut property in the horizontal direction of the pouch body. It is.

Further, in the present invention, the sealant layer may be a laminate of polypropylene resin films having a linear cutting property in the horizontal direction of the pouch body. By using a material that has been formed into a film in advance, lamination of the sealant layer, that is, production of the laminate can be carried out more easily and stably.

In addition, in the present invention, the automatic steam venting mechanism does not impose any particular limitation on its method. It is also possible to adopt a method in which a part of is peeled off and steamed.

In this case, it can be realized by methods within the scope of conventional manufacturing processes, such as methods such as bending or bending a portion of the seal shape of the pouch, or by partially weakening the seal strength. No parts are required, and there is no risk of greatly pressing costs.
In addition, the polyethylene terephthalate film of the plastic film layer of the laminate can be provided with an inorganic compound deposition film on its surface.

This is intended to provide a gas barrier layer in the laminate constituting the standing pouch (10) for the purpose of improving the storage stability of the contents. A gas barrier film is used in which a layer coating is provided by vapor deposition.

By the way, vapor-deposited film layers of metals such as aluminum and metal foils of aluminum are also effective as gas barrier layers, but they are unsuitable for cooking in a microwave oven because they generate sparks due to high frequencies.

In the case of a gas barrier film, the gas barrier layer can be composed of a vapor deposition layer of an inorganic compound and a coating layer. After providing an anchor coat on a plastic film, the vapor deposition layer and the coating layer are sequentially provided.

Urethane acrylate, for example, can be used for the anchor coat layer of the gas barrier film. For the formation of the anchor coat layer, a coating method that applies a printing method such as gravure coating with a paint in which a resin is dissolved in a solvent is used, and a generally known coating method can be used to form a coating film.

As a method for forming a deposited film layer, an inorganic compound such as SiO or AlO is coated on a plastic film provided with an anchor coat layer using a vacuum deposition method, and an inorganic compound layer is formed by a vacuum deposition method. can. Incidentally, the thickness of the deposited layer is preferably 15 nm to 30 nm.

As a method of forming the coating layer, an aqueous solution or water/alcohol A coating agent containing a mixed aqueous solution as a main component is applied on a film, and the film is dried by heating to form an inorganic compound layer by a coating method, whereby a coating layer can be obtained. At this time, the adhesion to the anchor coat layer can be improved by adding a silane monomer to the coating agent.

The inorganic compound layer has gas barrier properties even if it is only a coating film formed by a vacuum deposition method, but a coating layer, which is an inorganic compound layer formed by a coating method, is formed over a deposited layer, which is an inorganic compound layer formed by a vacuum deposition method, to form a gas barrier layer. be able to.

By combining these two layers, a reaction layer of both layers is generated at the interface between the inorganic compound layer by the vacuum deposition method and the inorganic compound layer by the coating method, or the inorganic compound layer by the coating method becomes the inorganic compound layer by the vacuum deposition method. A dense structure is formed by filling and reinforcing defects such as pinholes, cracks, and grain boundaries, or micropores.

As a result, the gas barrier film achieves higher gas barrier properties, moisture resistance, and water resistance, and is flexible enough to withstand deformation due to external force, so that it is suitable as a packaging material.

Moreover, when SiO is used as the gas barrier layer, the coating is transparent, so that the contents can be seen from the outside of the pouch. These may be properly used depending on the application and required quality.

Further, the polyethylene terephthalate film of the plastic film layer of the laminate can be a middle-cut polyethylene terephthalate film.

In this case, by selectively using a middle-cut polyethylene terephthalate film, it is possible to use a part with a balanced stretch, so that the body laminate is cut linearly along the planned opening line to open. It is also effective in preventing inconveniences such as so-called splitting, in which the direction of tearing is greatly deviated when trying to do so.

Further, it is possible to further provide a polyamide film having a straight cutting property in the horizontal direction of the pouch body as an intermediate film layer of the laminate.

In this case, by adding a polyamide film layer to the laminate, mechanical strength such as puncture resistance can be deducted, while there is no risk of impairing the linearity of tearing.

In addition, the polyethylene terephthalate film of the intermediate film layer of the laminate may be provided with a scratched line along the planned opening line of the pouch body.

In this case, by providing a scratching line directly on the intermediate film layer, it is possible to create a mechanism that assists straight cutability even when opening by tearing, so that easier and more stable straightness can be achieved. It is effective in realizing

In addition, the scratching line can be provided by sewing or half-cutting. As a result, it is possible to provide a mechanism for assisting straight cutability, which is effective in achieving easier and more stable straightness, and has the advantage of excellent scratching productivity.

In addition, if necessary, a printed layer can be provided on the layer visible from the outside of the pouch in the laminate for the purpose of improving the image of the product, displaying necessary information about the contents, and improving the design. The printed layer may be provided on the outermost layer of the pouch.

Moreover, the printed layer may be provided on a part of the pouch, or may be provided over the entire surface of the pouch. Alternatively, as a method of providing a display portion without using a printed layer, for example, it is possible to attach a printed seal to the surface of the pouch.

Here, there are no particular restrictions on the printing method and printing ink, but among known printing methods, printability on plastic films, design properties such as color tone, adhesion, and safety as food containers It may be selected as appropriate by taking into consideration the above.

For example, it can be selected from known printing methods such as gravure printing, offset printing, gravure offset printing, flexographic printing, silk screen printing, and inkjet printing. Among them, the gravure printing method can be preferably used in terms of productivity, suitability for printing on plastic films, and high definition of patterns.

In this way, according to the present invention, in a self-supporting pouch that allows the content to be cooked in a microwave oven, the steam generated from the content during cooking can be discharged to the outside. It is possible to provide a standing pouch that has a steam release mechanism, is easy to open, has excellent straightness of the cut end, and can maintain the opening shape of the opening.

Hereinafter, the present invention will be described in more detail with reference to Examples 1 to 4 and Comparative Examples 1 and 2 and with reference to the drawings. However, the standing pouch according to the invention is not limited to the examples shown here. The invention is limited by the claims.

FIG. 3 is a schematic plan view showing an external shape and dimensions for explaining an example of a standing pouch related to the present invention and a comparative example.

Based on the standing pouches of Examples 1 to 4 and Comparative Examples 1 and 2, laminate-forming pouches were made into evaluation samples.
That is, the dimensions of the standing pouch are 158 mm long x 150 mm wide.
and

The pouch is equipped with an automatic steam release mechanism (12). This automatic steam venting mechanism (12) is common to Examples 1 to 4 and Comparative Examples 1 to 2, and is the seal portion at the upper right side end (2) in FIG. , the bent portion of the seal that is convex toward the inside of the pouch.

A notch (8) is provided in the sealing portion of the side end (2) facing the automatic steam venting mechanism (12), and a planned unsealing line (5) is provided continuously in the horizontal direction. The tearing direction for opening is from left to right in FIG. 3, as indicated by the thick arrow in FIG.

The content was placed in a standing pouch prepared for evaluation, sealed, and then heated and cooked in a microwave oven for evaluation.

The contents to be accommodated were meat balls.

Also, the evaluation was performed after heating and cooking in a microwave oven.

Evaluation items are as follows.
・Microwave cooking suitability ・Cutability when opening ・Presence or absence of splitting when opening: (Medium or higher was evaluated as ×)
- Appearance after opening.

<Example 1>
FIG. 4 is a schematic partial cross-sectional view of a laminate constituting the pouch for explaining Example 1 of the standing pouch according to the present invention.

The layer structure of the laminate (50) is as follows.
Polyethylene terephthalate film with transparent inorganic compound deposited film (thickness 12 μm) (30)/Polyethylene terephthalate film having straight cutting property (thickness 12 μm) (33)/Straight cutting heat resistant unstretched polypropylene resin layer (thickness 60 μm) ( 34).

The polyethylene terephthalate film (thickness: 12 μm) (30) with a transparent inorganic compound deposited film is composed of a polyethylene terephthalate film (31) and a transparent inorganic compound deposited film (32).

<Example 2>
FIG. 5 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Example 2 of the standing pouch according to the present invention.

The layer structure of the laminate (51) is as follows.
Polyethylene terephthalate film with transparent inorganic compound deposited film (thickness: 12 μm) (30)/Polyethylene terephthalate film with straight cutability (thickness: 12 μm) with perforation (35)/Heat resistant unstretched polypropylene resin layer with straight cutability (thickness: 60 μm) (34).

That is, in addition to Example 1, the intermediate film layer is further provided with a perforation (38).

<Example 3>
FIG. 6 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Example 3 of the standing pouch according to the present invention.

The layer structure of the laminate (52) is as follows.
Polyethylene terephthalate film with transparent inorganic compound deposited film (thickness 12 μm) (30)/Polyamide film having linear cuttability (thickness 15 μm) (40)/Polyethylene terephthalate film having linear cuttability (thickness 12 μm) (33) / Straight-cut heat-resistant unstretched polypropylene resin layer (thickness 60 μm) (34).

That is, in addition to Example 1, a polyamide film (thickness 15 μm) (40) having linear cuttability, a polyethylene terephthalate film (thickness 12 μm) (30) with a transparent inorganic compound vapor deposition film, and a linear cuttability It is added between the polyethylene terephthalate film (thickness 12 μm) (33).

<Example 4>
FIG. 7 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Example 4 of the standing pouch according to the present invention.

The layer structure of the laminate (53) is as follows.
Intermediate polyethylene terephthalate film (thickness 12 μm) (36) with transparent inorganic compound deposited film (thickness 12 μm) (33)/linear cuttability heat-resistant unstretched polypropylene resin layer (thickness 60 μm) ) (34).

That is, the polyethylene terephthalate film (thickness: 12 μm) with a transparent inorganic compound vapor-deposited film of Example 1 was used with a “middle” grade polyethylene terephthalate film (37).

<Comparative Example 1>
FIG. 8 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Comparative Example 1 of the standing pouch according to the present invention.

The layer structure of the laminate (54) is as follows.
Polyethylene terephthalate film (thickness: 12 μm) (30)/polyamide film (thickness: 15 μm) (41)/straight cut heat-resistant unstretched polypropylene resin layer (thickness: 60 μm) (34).

That is, a polyamide film (15 μm thick) (41) was used as an intermediate film layer adjacent to the sealant layer. This polyamide film (thickness 15 μm) (41) does not have straight cuttability. This part of the intermediate film layer is therefore part of the construction of the laminate according to the invention.

<Comparative Example 2>
FIG. 9 is a schematic partial cross-sectional view of a laminate constituting a pouch for explaining Comparative Example 2 of the standing pouch according to the present invention.

The layer structure of the laminate (55) is as follows.
Polyethylene terephthalate film (thickness: 12 μm) (30) with transparent inorganic compound deposited film (thickness: 12 μm) (40)/polyamide film (thickness: 15 μm) (40)/heat-resistant unstretched polypropylene resin layer (thickness: 60 μm) (39).

That is, the heat-resistant unstretched polypropylene resin layer (thickness: 60 µm) (39) was used for the sealant layer, without considering the straight line cuttability. This part of the sealant layer is therefore part of the construction of the laminate according to the invention.

Table 1 shows the evaluation results of Examples 1 to 4 and Comparative Examples 1 and 2.

As can be seen from the results shown in Table 1, for Examples 1 to 4, which are standing pouches according to the present invention, good results were obtained in terms of microwave cooking aptitude and cuttability when opened. These results show no significant difference compared to Comparative Examples 1 and 2.

However, with respect to Examples 1 to 4, which are the standing pouches according to the present invention, the comparison deviated from the structure of the laminate of the standing pouches according to the present invention in terms of the occurrence of tearing at the time of opening and the appearance after opening. As compared with Examples 1 to 2, superiority is clearly seen.

Therefore, according to the present invention, a self-supporting pouch capable of cooking the contents in a microwave oven is provided with an automatic steam venting mechanism capable of discharging the steam generated from the contents during cooking to the outside. In addition, it was verified that it is possible to provide a standing pouch that is easy to open, has excellent linearity of the cut end, and can maintain the opening shape of the opening.

Subsequently, Examples 1 to 4 and Comparative Examples 1 and 2 are individually considered.

In Example 1, all the evaluation items of microwave oven cooking suitability, cuttability at the time of opening, splitting at the time of opening, and appearance after opening were evaluated as ◯.

In the layer structure of the laminate (50),
By having a polyethylene terephthalate film (thickness 12 μm) with straight cutability and a heat resistant unstretched polypropylene resin layer (thickness 60 μm) with straight cutability, cutability at the time of opening, tearing at the time of opening, and opening It is believed that excellent results were obtained in later appearance.

In Example 2, all the evaluation items of microwave oven cooking suitability, cuttability at the time of opening, tearing at the time of opening, and appearance after opening were evaluated as ◯.

In the layer structure of the laminate (51),
Straight-cut polyethylene terephthalate film (thickness 12 μm) with perforation/straight-cut heat-resistant unstretched polypropylene resin layer (thickness 60 μm), making it easy to cut and tear when opened. It is considered that excellent results were obtained in terms of appearance after opening.

In addition, compared to Comparative Example 1, the addition of perforations is considered to be more effective in stabilizing cuttability upon opening and against tearing upon opening.

Example 3 was evaluated as ◯ for all evaluation items including suitability for microwave cooking, cuttability at the time of opening, splitting at the time of opening, and appearance after opening.

In the layer structure of the laminate (52),
It has a linearly cuttable polyamide film (thickness 15 μm)/linearly cuttable polyethylene terephthalate film (thickness 12 μm)/linearly cuttable heat-resistant unstretched polypropylene resin layer (thickness 60 μm). Since each of them has straight cuttability, it is considered that excellent results were obtained in terms of cuttability at the time of opening, tearing at the time of opening, and appearance after opening.

A slight difference from Example 1 was observed in the cuttability at the time of opening and the appearance after opening. Yes, it is within the practical range.

That is, although the addition of the polyamide film layer improves the mechanical strength such as puncture resistance, the polyamide film itself has a straight cutting property, so the laminate as a whole cannot be cut when unsealed. It is considered that excellent results were obtained in terms of the properties, tearing at the time of opening, and the appearance after opening.

In Example 4, all the evaluation items of microwave oven cooking suitability, cuttability at the time of opening, splitting at the time of opening, and appearance after opening were evaluated as ◯.

In the layer structure of the laminate (53),
A polyethylene terephthalate film (thickness 12 μm) with a transparent inorganic compound deposition film is used. It is thought that the effect was obtained. Therefore, it is considered that excellent results were obtained in cuttability at the time of opening, tearing at the time of opening, and appearance after opening.

In Comparative Example 1, among the microwave oven cooking suitability, cuttability at the time of opening, tearing at the time of opening, and appearance after opening, the evaluation was x in terms of the tearing at the time of opening and the appearance after opening.

In the layer structure of the laminate (54),
It contains a polyamide film (thickness 15 μm), and since this layer is not provided with a straight cutting property, the laminate as a whole is torn when unsealed, and as a result, the appearance after unsealing is damaged. It is considered to be a thing.

In Comparative Example 2, among the microwave oven cooking suitability, cuttability at the time of opening, tearing at the time of opening, and appearance after opening, the evaluation was x in terms of the tearing at the time of opening and the appearance after opening.

In the layer structure of the laminate (55),
The part corresponding to the sealant layer uses a heat-resistant unstretched polypropylene resin layer (thickness 60 μm), and since this layer itself is not given a straight cutting property, the laminate as a whole does not tear when opened. was generated, and as a result, the appearance after opening was spoiled.

As described above, according to the present invention, there is provided a self-supporting pouch capable of cooking contents in a microwave oven, in which steam generated from the contents during cooking can be discharged to the outside. It has been verified that it is possible to provide a standing pouch that has a pull-out mechanism, is easy to open, has excellent straightness of the cut end, and can maintain the open shape of the opening.

REFERENCE SIGNS LIST 1 front side body 2 both ends 3 lower end 4 upper end 5 planned opening line 6 folding line 7 rear side body 8 notch 10 bottom film 11 planned opening line 12 automatic steam venting mechanism 14 Contents 20 Opening 30 Polyethylene terephthalate film with a transparent inorganic compound deposited film (thickness 12 μm)
31... Polyethylene terephthalate film 32... Transparent inorganic compound deposition film 33... Polyethylene terephthalate film having straight cutting property (thickness: 12 µm)
34... Straight cut heat resistant unstretched polypropylene resin layer (thickness 60 µm)
35... Polyethylene terephthalate film (thickness 12 µm) having a straight cutting property with perforation 36... Intermediate polyethylene terephthalate film (thickness 12 µm) with a transparent inorganic deposition film
37... Intermediate polyethylene terephthalate film 38... Sewing process 39... Heat resistant unstretched polypropylene resin layer (thickness 60 µm)
40 ... Polyamide film having straight cutability (thickness 15 μm)
41 ... Polyamide film (thickness 15 μm)
50 Laminated body 51 Laminated body 52 Laminated body 53 Laminated body 54 Laminated body 55 Laminated body 90 Upper part of pouch 100 Standing pouch

Claims (9)

A pouch made of a laminate of plastic films and capable of being heated and cooked in a microwave oven,
The laminate is composed of a plastic film layer on the outermost side of the pouch, an intermediate film layer, and a sealant layer on the innermost side of the pouch.
The pouch is made so that the contents can be accommodated by the front side body part, the rear side body part, and the bottom film disposed therebetween,
The pouch is equipped with an automatic steam vent mechanism that can discharge the steam generated from the contents during cooking with a microwave oven.
The front trunk and the rear trunk have four sides and are arranged with the sealant layers facing each other,
Of these four sides, both left and right ends of the body are sealed, and both ends of the pouch are sealed,
At the bottom of the body, a bottom film is folded and arranged between the front body and the back body, and the lower end of the pouch is sealed and sealed with the body such that the bottom film forms the bottom surface. and
In the upper body part, the front body part and the rear body part are sealed at the upper end of the pouch after containing the contents, so that the entire pouch can be sealed,
At least one of the sealing portions at both ends of the body is provided with a notch, and the horizontal straight line of the body on the front and back of the pouch with this cut as a starting point is the planned opening line,
The plastic film layer on the outermost layer side of the laminate uses a polyethylene terephthalate film,
The intermediate film layer of the laminate is a layer adjacent to the sealant layer, and uses a polyethylene terephthalate film having a straight cut property in the horizontal direction of the pouch body,
A standing pouch, wherein the sealant layer on the innermost layer side of the laminate is a polypropylene resin layer having linear cuttability in the horizontal direction of the pouch body. Claim 1, characterized in that the notch is provided at a position between the height of the surface of the contents and the sealing portion at the upper end of the pouch when the pouch stands on its own after containing the contents. The standing pouch described in . 3. The standing pouch according to claim 1, wherein the sealant layer is a laminate of a polypropylene resin film having a linear cutting property in the horizontal direction of the pouch body. The automatic steam venting mechanism is characterized in that during cooking with a microwave oven, steam is generated from the contents, and a part of the sealed portion of the pouch is peeled off to allow steam to pass through. A standing pouch according to any one of the above. 5. The standing pouch according to any one of claims 1 to 4, wherein the polyethylene terephthalate film of the plastic film layer of the laminate is provided with an inorganic compound deposition film on its surface. 6. The standing pouch according to any one of claims 1 to 5, wherein the polyethylene terephthalate film of the plastic film layer of the laminate is an intermediate polyethylene terephthalate film. 7. The standing pouch according to any one of claims 1 to 6, wherein the intermediate film layer of the laminate further includes a polyamide film having a straight cutting property in the horizontal direction of the pouch body. The polyethylene terephthalate film of the intermediate film layer of the laminate is provided with a scratched line along the planned opening line of the pouch body. The standing pouch described in . 9. The standing pouch according to claim 8, wherein the scratch lines are perforations or half-cut lines.

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