JP7533047B2 - Packaging Bag - Google Patents

Description

The present invention relates to a packaging bag that can be used for cooking in a microwave oven. In particular, the packaging bag is also called a standing pouch, which has a bottom film at the bottom and can stand on its own, and is equipped with an automatic steam release mechanism that can automatically release water vapor generated from the contents during cooking to the outside.

Packaging bags, a type of packaging material, are widely used and are made of single-layer or laminated plastic film as a base material. They come in a variety of shapes and are used for a wide range of purposes, making them an indispensable part of modern people's lives.

Packaging bags are used, for example, as containers for liquids, and are widely used in the food sector, including beverages and retort foods, as well as in the fields of daily necessities and toiletries, with a wide variety of products lining the shelves of supermarkets, drugstores, and convenience stores.

The advantages of packaging bags compared to containers such as cans and bottles include their low price, the ability to respond to various quality requirements through detailed material design, and the fact that they are lightweight and space-saving before being filled with the contents and during distribution and storage. Packaging bags can also be said to be environmentally friendly containers from the perspective of reducing waste after the contents have been removed or consumed.

In addition, high-resolution printing on the layer visible from the outside of the packaging bag can improve the product's image and display necessary information about the contents, and printing barcodes, for example, is also a source of information for product distribution, inventory management, and marketing.

Some packaging bags have been commercialized to be self-supporting, and are generally called standing pouches. Being able to stand on its own is advantageous for product display and display, and also has advantages in terms of usability, for example making it easier to remove the contents.

Furthermore, when opening the packaging bag after cooking, importance is attached to preventing burns caused by the escape of steam remaining inside the packaging bag, ease of opening the opening, and maintaining the shape of the opening.

Patent Document 1 proposes a packaging bag that has an internal space for storing contents, a first opening with a fastener, and a second opening on the side for filling the internal space with the contents. However, if the design is designed to ensure self-supporting, the second opening for filling tends to be narrow, making it difficult to fill the bag stably using an automatic filling machine.

In other words, in the packaging bag configuration shown in Patent Document 1, because the second opening for filling is provided on the side, there is a trade-off between the opening for filling and the folded width of the bottom film, and if an attempt is made to widen the filling opening in consideration of the height dimension inside the microwave oven and the suitability for filling, the folded width of the bottom film becomes smaller, resulting in a loss of self-supporting ability.

WO 13/115362

The present invention was made in consideration of such circumstances, and aims to provide a packaging bag with a flap and zipper tape, which is made of a plastic film as a base material, is suitable for mechanical filling using an automatic filling machine, is self-supporting, and has an automatic steam release mechanism so that it can be used for cooking in a microwave oven.

As a means for solving the above problem, the invention described in claim 1 comprises:
A packaging bag made of a film having a sealant layer, which allows the contents to be cooked in a microwave oven,
The packaging bag has a space inside capable of storing contents, and is composed of a front body, a rear body, a bottom, and a flap.
The front and rear torso sections are sealed at the left and right side edges,
The upper side of the body portion is an opening for mechanical filling, which allows the contents to be filled, and after filling, the front body portion and the rear body portion are sealed to seal the packaging bag.
Below the top seal, there is a line along the width of the package to indicate where the package should be opened.
At a lower portion of the body portion, a bottom film is expandably folded and sealed between the front body portion and the rear body portion to form a bottom portion;
This bottom allows the packaging bag to stand on its own,
The upper part of the front body has a flap that protrudes diagonally upward from the body.
The flap is formed by overlapping a flap rear film that continues from above the packaging bag beyond the height position of the flap and a flap front film that continues from below the packaging bag beyond the height position of the branch with the sealant layers facing each other, sealing the side end of the flap, and closing the tip of the flap by sealing or folding back,
The flap has the following parts starting from its tip:
There is a line along the width of the flap to open it.
Next, a fitting portion is provided in the width direction by a zipper tape made of a thermoplastic resin,
Furthermore, a watertight joint is provided in the width direction on the inside of the zipper tape fitting,
The watertight joint separates the zipper tape fitting from the content storage space of the packaging bag,
This packaging bag is characterized in that half-cut or full-through flaws are provided on either or both of the flap front film and the flap rear film between the fastener tape fitting portion and the watertight joint.

The invention described in claim 2 is as follows:
The packaging bag according to claim 1, wherein the watertight joint is formed by joining the bases of opposing zipper tapes, or by joining the base of one zipper tape and the sealant layer of the opposing flap, or by joining the sealant layers of the opposing flaps, and the breaking strength of the watertight joint is in the range of 3 N/15 mm to 20 N/15 mm.

The invention described in claim 3 is as follows:
The fastener tape has a cross section of a fitting part perpendicular to its longitudinal direction that is asymmetrical up and down with respect to a center line, and the inner fitting strength from the contents side of the flap and the outer fitting strength from the tip side of the flap are as follows:
The packaging bag according to claim 1 or 2, characterized in that the inner fitting strength is greater than the outer fitting strength.

The invention described in claim 4 is as follows:
The packaging bag according to any one of claims 1 to 3, characterized in that the internal fitting strength of the zipper tape is 70% or more of the sealed portion of the side end of the packaging bag, and the external fitting strength is 20 N/15 mm or less.

The invention described in claim 5 is as follows:
The packaging bag according to any one of claims 1 to 4, characterized in that the scratching is provided over a length in the range of 5% to 30% of the total width of the opening of the flap of the packaging bag.

The present invention provides a packaging bag with a plastic film base, which is suitable for mechanical filling in an automatic filling machine, is self-supporting, and has an automatic steam release mechanism, allowing cooking in a microwave oven, and which has a flap and a zipper tape.

In particular, the flap is provided with a scratched area between the zipper tape and the watertight joint, which allows this area to effectively function as an automatic steam release mechanism during cooking. This method allows an automatic steam release mechanism to be formed in the packaging bag without using a separate component, which has the advantage of simplifying the formation process and reducing manufacturing costs.

At the bottom of the body, a bottom film is folded and sealed in an expandable manner between the front and rear body sections to form a bottom section, which allows the packaging bag to stand stably on its own.

In addition, the stable self-supporting nature of the packaging bag according to the present invention means that when cooking food in a microwave oven, the food can be cooked in a self-supporting state inside the microwave oven, eliminating the need to transfer the food to another container, making it highly convenient.

In addition, a flap is provided at the top of the front body that protrudes diagonally upwards from the body, making it possible to add fresh ingredients or toppings from this part before cooking.

Furthermore, starting from the tip of the flap, a line for opening the flap is provided in the width direction, followed by a width-wise opening and closing section using zipper tape. Furthermore, a watertight joint is provided in the width direction inside the packaging bag from the zipper tape joint, which makes it possible to separate the zipper tape joint from the content storage space of the packaging bag. Therefore, it is possible to open the flap without the zipper tape touching the contents and add additional food and ingredients for cooking.

In addition, half-cut or full-through cuts are provided on either or both of the flap front film and flap rear film between the zipper tape fitting and the watertight joint, allowing this area to function as an automatic steam passage mechanism.

By being equipped with an automatic steaming mechanism, the packaging bag can automatically and gently release the steam that is generated during cooking, making it possible to avoid dangers such as explosive bag rupture and burns to fingers caused by steam escaping.

In particular, according to the invention described in claim 2, the watertight joint can be formed without using a separate material, and can be formed easily and inexpensively.

In addition, since the breaking strength of the watertight joint is in the range of 3 N/15 mm to 20 N/15 mm, this packaging bag is able to achieve both resistance to impact if dropped and ease of opening the flap.

In addition, according to the invention described in claim 3 in particular, a method of varying the fitting strength so that the inner fitting strength is greater than the outer fitting strength can be achieved by making the cross-sectional shape of the zipper tape asymmetrical with respect to the center line, making it possible to avoid cumbersome manufacturing methods such as using separate members.

Furthermore, because the internal fitting strength of the flap from the contents side and the external fitting strength from the tip side of the flap are such that the internal fitting strength is greater than the external fitting strength, it is possible to use the flap in a way that makes it easy to open the flap, add cooking utensils through the flap of the packaging bag, then close and seal the flap again with the zipper tape, cook the food in a microwave oven, and release the water vapor using the automatic steaming mechanism.

In particular, according to the invention described in claim 4, the inner fitting strength of the zipper tape is 70% or more of the sealed portion of the side end of the packaging bag, which makes the bag more suitable for passing steam, and the outer fitting strength is 20 N/15 mm or less, which makes the packaging bag easier to open with the zipper tape.

In particular, according to the invention described in claim 5, the scratching is performed over a length that is in the range of 5% to 30% of the total width of the opening of the flap of the packaging bag, thereby making it possible to produce a packaging bag that has an automatic steaming mechanism and is more resistant to vibrations and shocks during distribution and the handling that accompanies it.

FIG. 1 is a schematic plan view (partially see-through) for explaining one embodiment of a packaging bag according to the present invention. FIG. 2 is a schematic perspective view (partially see-through) for explaining one embodiment of a packaging bag according to the present invention. FIG. 3 is a schematic partial cross-sectional view for explaining one embodiment of the structure of the zipper tape, the watertight joint and the automatic steam release mechanism provided on the flap in the packaging bag according to the present invention. FIG. 4 is a schematic partial cross-sectional view for explaining another embodiment of the structure of the zipper tape, the watertight joint and the automatic steam release mechanism provided on the flap in the packaging bag according to the present invention. FIG. 5 is a schematic partial cross-sectional view for explaining still another embodiment of the structure of the zipper tape, the watertight joint and the automatic steam release mechanism provided on the flap in the packaging bag according to the present invention. FIG. 6 is a schematic partial cross-sectional view for explaining how the fitting portion of the zipper tape in the flap is released from the tip side of the flap in the packaging bag according to the present invention. FIG. 7 is a schematic plan view for explaining the configuration of an embodiment of a packaging bag according to the present invention. FIG. 8 is a schematic plan view for explaining the configuration of a comparative example of a packaging bag according to the present invention.

The present invention will now be described in more detail with reference to the drawings. However, the present invention is not limited to the examples shown here. The present invention is defined by the claims.

Figure 1 is a schematic plan view (partially see-through) illustrating one embodiment of a packaging bag according to the present invention.

The present invention relates to a packaging bag (100) made of a film with a sealant layer, and the contents can be cooked in a microwave oven. That is, the packaging bag (100) is made of a laminate with a sealant layer and a plastic film as a base material, and is formed by sealing the sealant layers together.

The packaging bag (100) has a space inside in which the contents can be stored, and is composed of a body (30) consisting of a front body (10) and a rear body (20), a bottom (50), and a flap (40).

The front body section (10) and the rear body section (20) are sealed at the ends (5) on both the left and right sides to form a seal section (6) that constitutes the body section (30), and the seal section (6) is formed around the periphery of the body section (30). However, in FIG. 1, the rear body section (20) is behind the front body section (10) and is not visible.

In addition, the upper edge (8) of the body (30) is used as an opening for mechanical filling, allowing the contents to be filled automatically. After filling, the front body (10) and rear body (20) are sealed, and a seal portion (7) is formed on the upper edge (8) to hermetically seal the packaging bag (100).

The top edge (8) is an opening for mechanical filling, but it is possible to make the entire length of the top edge (8) an opening, excluding the seal portions (6) on both side ends (5), without being affected by the folding width of the bottom film (14). This is effective in stabilizing and improving the filling suitability of the packaging bag (100) for automatic filling machines.

The bottom portion (50) is sealed between the front body portion (10) and the rear body portion (20) by folding the bottom film (14) expandably at the fold line (15), and the bottom portion (50) is hermetically sealed.

When the contents are filled, the bottom film (14) expands due to its volume and weight, and the expanded bottom (50) forms the bottom surface, allowing the packaging bag (100) to stand on its own.

This self-supporting property makes it possible to heat and cook food in the packaging bag (100) while it remains self-supporting, for example, inside a microwave oven, making the packaging bag (100) highly convenient.

The flap (40) can move up and down with the flap height position (3) as a fulcrum, but in the example shown in Figure 1, the flap (40) is shown overlapping the front body part (10) above the flap height position (3).

Figure 2 is a schematic perspective view (partially see-through) illustrating one embodiment of a packaging bag according to the present invention.

In the example shown in Figures 1 and 2, a planned opening line (13) is provided on the width of the body below the seal portion (7) on the upper edge (8).

As described above, the upper side (8) of the body (30) functions as an opening for mechanical filling, but after filling with the contents, the front body (10) and the rear body (20) are sealed to form a seal part (7).
) and the upper edge (8) of the packaging bag (100) is sealed.

After cooking, when the cooked contents are to be removed, the upper part of the body (30) of the packaging bag (100) is cut along the intended opening line (13) on the body to create an opening through which the contents can be removed. The cutting can be done, for example, with a cutting tool such as scissors or a knife.

In the example shown in Figures 1 and 2, a notch (12) is provided in the seal portion (6) of the side end portion (5) that is continuous with the intended opening line (13) of the body portion. When the notch (12) is provided and the intended opening line (13) of the body portion is an easy-opening mechanism, it becomes possible to easily open the package using the fingers.

In addition, the cut (12) and the intended opening line (13) on the body can be displayed so that they can be visually confirmed by printing or other means if necessary, further improving convenience.

Meanwhile, in the lower part of the torso (30), between the front torso (10) and the rear torso (20), the bottom film (14) is folded and sealed expandably at the fold line (15) to form the bottom (50).

The bottom (50) is formed by sandwiching and sealing the bottom film (14) between the front body (10) and the back body (20). When the contents are filled, the bottom film (14) expands due to the volume and weight of the contents, and the expanded bottom (50) forms the bottom surface, allowing the packaging bag (100) to stand on its own.

The packaging bag (100) is self-supporting, which is advantageous not only for display and exhibition as a product, but also for ease of use; for example, the contents can be conveniently removed while still standing upright.

Furthermore, the ability to maintain its independence even inside a microwave oven makes cooking more convenient, and in addition to making it easier to open after cooking, it is also effective in maintaining the shape of the packaging bag (100).

On the other hand, a flap (40) is provided on the upper part of the body (30) and protrudes diagonally upward from the height position (3) of the flap of the front body (10).

The flap (40) is made by overlapping the rear flap film, which continues from above the front body part (10) beyond the flap height position (3), and the front flap film, which continues from below the front body part (10) beyond the flap height position (3), with the sealant layers of each film facing each other.

The side end (44) of the flap (40) is sealed to form a sealed portion (43), and the tip (41) of the flap (40) is closed by sealing or folding back the film to form a sealed structure for the flap (40).

In the example shown in FIG. 2, the flap front film that continues from the bottom of the front body part (10) is visible, but the flap rear film is behind it and is not visible. Also, in the example shown in FIG. 2, the tip part (41) of the flap (40) is closed by the seal part (42).

The flap (40) has a flap opening line (45) in the width direction starting from its tip (41), followed by a zipper tape (46) that opens and closes in the width direction. The zipper tape (46) opens and closes by fitting together the male and female parts of the zipper tape (46). Furthermore, a watertight joint (47) is provided in the width direction on the contents side of the zipper tape (46).

In the packaging bag (100) according to the present invention, the watertight joint (47) provided on the flap (40) separates the fitting of the zipper tape (46) from the content storage space of the packaging bag (100).

The watertight joint (47) can be formed by either joining the bases of the opposing zipper tapes (46), or joining the base of one zipper tape (46) to the sealant layer of the opposing flap (40), or joining the sealant layers of the opposing flaps (40).

In this case, for example, the breaking strength of the watertight joint (47) can be in the range of 3 N/15 mm to 20 N/15 mm. In this range, it is possible to achieve both drop resistance and ease of opening of the packaging bag (100).

Also, between the zipper tape (46) and the watertight joint (47), half-cut or full-through scratch processing (9) is provided on either or both of the flap front film and the flap rear film. In the example shown in Figure 2, the scratch processing (9) provided on the flap front film is visible.

The scratched portion (9) between the zipper tape (46) and the watertight joint (47) acts as an automatic steam release mechanism when the contents are cooked in a microwave oven.

When the contents of the packaging bag (100) are cooked in a microwave oven, water vapor is generated from the contents as they are heated, and if the packaging bag (100) is sealed, the volume of the contents expands. After the packaging bag (100) is filled with water vapor, the internal pressure of the packaging bag (100) increases.

At this time, by providing an automatic steam release mechanism in the packaging bag (100), when the internal space of the packaging bag (100) reaches a certain internal pressure, the scratch processing (9), which is a relatively vulnerable part to pressure from the inside, will tear, connecting the internal space of the packaging bag (100) to the outside, and water vapor will be automatically released.

We have explained the packaging bag (100) of the present invention using Figures 1 and 2, but we will now explain an example of its actual use.

For example, consider a case where the contents are liquid seasoning for cooking provided by a food manufacturer or the like, and the liquid seasoning is filled and sealed in a packaging bag (100) and distributed and sold as a product. Food ingredients and toppings for cooking can be added by general consumers as appropriate when cooking. These added food ingredients and toppings can also be fresh ingredients such as raw eggs and vegetables.

That is, general consumers purchase cooking seasoning liquid filled in a packaging bag (100) as a product. The packaging bag (100) of the present invention allows general consumers to add additional ingredients and toppings through the flap (40) when cooking, and the flap (40) makes it easy to add ingredients.

First, the flap (40) of the packaging bag (100) is cut along the intended opening line (45) of the flap provided at the top of the flap to create an opening. The cutting can be performed using a cutting tool such as scissors or a knife.

The example shown in Figures 1 and 2 is an example in which a notch (16) is provided in the seal portion (43) of the side end portion (44) that is continuous with the intended opening line (45) of the flap. When the notch (16) is provided and the intended opening line (45) of the flap is an easy-to-open mechanism, it can be easily opened using fingers. If necessary, the intended opening line (45) of the flap can also be displayed by printing or other means so that it can be visually confirmed, further improving convenience.

The easy-open mechanism does not impose any particular restrictions on its method, and the opening line (45) of the flap can be achieved, for example, by half-cutting the film or by using the molecular orientation of the plastic film. This also applies to the opening line (13) of the body portion mentioned above.

Next, the zipper tape (46) is released, and the watertight joint (47) is opened. In this state, the outside is connected to the inside of the packaging bag (100), and additional ingredients and toppings for cooking can be added to the packaging bag (100) via the flap (40).

After the ingredients and toppings are inserted through the flap (40), the flap (40) is closed again with the zipper tape (46) to seal the food, and cooking is performed in the microwave oven. During cooking, the automatic steaming mechanism using the cut processing (9) operates to automatically release steam. The automatic steaming mechanism using the cut processing (9) will be explained in more detail later.

In this way, after the food ingredients and other ingredients have been added and cooking is completed, the package (100) can be opened by cutting along the intended opening line (13) on the body of the package using the notch (12) on the side end (5) of the package, removing the cooked contents and transferring them to dishes or the like for consumption.

The packaging bag (100) of the present invention is a packaging bag (100) that allows you to easily prepare steamed or stewed dishes by adding fresh ingredients or other ingredients to the pre-filled cooking seasoning liquid and heating and cooking in a microwave oven, and has many advantages for the general consumer.

For example, the packaging bag (100) of the present invention allows fresh ingredients and other ingredients to be added just before cooking in a microwave oven, so the flavor and nutritional value of the ingredients are less likely to be lost. In addition, the packaging bag (100) is equipped with an automatic steaming mechanism that automatically releases water vapor that fills the inside of the bag to the outside, making it possible to prevent explosive rupture of the bag during cooking, and has the advantage of ensuring safety when handling the bag after cooking by preventing burns to hands and fingers.

Furthermore, the packaging bag (100) according to the present invention allows cooking without using fire, which is an advantage of a microwave oven, and is also effective in eliminating the hassle of cooking and reducing the effort and time required to clean up pots, cooking utensils, and dishes after cooking.

In this way, the packaging bag (100) of the present invention can be opened by cutting the opening line (13) on the body, and the cooked contents can be removed from the opening. This opening for removal is located separately from the automatic steam mechanism created by the scratch processing (9) on the zipper tape (46) of the flap (49), making it possible to avoid the risk of burns to the hands and fingers caused by steam that often occurs when opening the bag.

In addition, the packaging bag according to the present invention has a watertight joint (47) that separates the fitting of the zipper tape (46) from the content storage space of the packaging bag (100), thereby preventing the contents stored in the body (30) from coming into contact with the fitting of the zipper tape (46) before the flap (40) is opened.

Therefore, the watertight joint (47) prevents the contents from entering the flap (40), and when the zipper tape (46) of the flap (40) is released and reattached to add cooking ingredients, the contents that have been pre-filled in the packaging bag (100), such as cooking seasoning, can be prevented from adhering to the zipper tape (46) fitting, which is convenient and eliminates the risk of soiling the hands and fingers.

Next, we will provide a more detailed explanation of the automatic steaming mechanism achieved by scratch processing (9) according to the present invention.

After the ingredients and other ingredients have been added, the contents are heated and cooked in the microwave oven, generating steam inside the packaging bag (100). This steam increases the volume of the sealed packaging bag (100), and after filling the internal space of the packaging bag (100), the internal pressure of the packaging bag increases. This volume expansion occurs in a three-dimensional radial pattern from the center of volume of the packaging bag (100) to the outside.

At this time, the internal pressure of the body (30) and flap (40) of the packaging bag (100) rises, and when it exceeds a certain pressure, the scratching (9), which is relatively vulnerable to pressure, becomes a tear and acts as a steam-passing mechanism. In other words, the water vapor inside the packaging bag (100) is automatically discharged to the outside of the packaging bag (100) through the scratching (9).

In other words, the automatic steaming caused by the rise in the internal pressure of the packaging bag (100) with this scratch processing (9) connects the internal space of the packaging bag (100) with the outside, and the water vapor is automatically discharged. This is desirable for cooking in a microwave oven, and makes it possible to avoid explosive breakage of the packaging bag (100) due to a sudden rise in internal pressure.

It is also effective in preventing the contents and steam from escaping and the resulting burns to the hands and fingers when removing and handling the packaging bag (100) after cooking. In other words, the automatic steam passage mechanism provided by the scratch processing (9) makes it possible to relatively gently release steam caused by an increase in internal pressure.

In other words, if the cut (9) on the zipper tape (46) is opened relatively gently, the mechanism can be made safer when handling the packaging bag (100) after cooking and removing the contents.

Also, as shown in the example of the packaging bag (100) shown in Figures 1 and 2, the scratching (9) is provided on the inside of the flap (40), while the contents are filled and added below the body (30). Therefore, this position is convenient because it does not cause the heated contents to spray out during automatic steaming, and does not prevent the generated water vapor from being exhausted.

There are no particular limitations on the method of forming the scratch processing (9) on the flap (40) as long as the function of the automatic steaming mechanism can be fulfilled, and for example, half-cut or full-through scratch processing (9) can be provided on either or both of the flap front film and the flap rear film using a laser or a blade. The shape of the scratch processing may be a straight line or a broken line.

The scratch processing (9) can be provided over a length in the range of 5% to 30% of the total opening width of the flap (40) of the packaging bag (100). When provided in this range, the packaging bag (100) can have better flow resistance and steam permeability.

Figure 3 is a schematic partial cross-sectional view illustrating one embodiment of the structure of the zipper tape, watertight joint, and automatic steam release mechanism provided on the flap in the packaging bag according to the present invention.

The flap (40) is composed of a flap rear film (48) that continues from above the front body part (10) beyond the flap height position (3), and a flap front film (49) that continues from below the front body part (10) beyond the flap height position (3), with the sealant layers (1) facing each other and overlapping and sealing at the side end part (44) of the flap (40) to form a seal part (43).

As mentioned above, in the present invention, the flap (40) is provided, in order from its tip (41), with a flap opening line (45) in the width direction, a width opening and closing section formed by a zipper tape (46), and further, a watertight joint (47) is provided in the width direction on the inside, i.e., the contents side, of the fitting section (2) of the zipper tape (46). Incidentally, the width direction here is the direction from the front to the back in FIG. 3.

Figure 3 shows the zipper tape (46) in the flap (40) and the watertight joint (47). The watertight joint (47) separates the fitting (2) of the zipper tape (46) from the content storage space of the packaging bag (100).

This watertight joint (47) makes it possible to prevent the liquid in the contents from leaking out to the fitting portion (2) of the zipper tape (46) even if pressure is generated from the contents side due to an external force.

Even if no pressure is applied from the contents, it is possible to prevent the contents from coming into contact with the fitting portion (2) of the zipper tape (46).

In addition, the breaking strength of the watertight joint is in the range of 3N/15mm to 20N/15mm, which allows this packaging bag to be both drop-resistant and easy to open.

In the example shown in FIG. 3, the watertight joint (47) is formed by joining the base of one zipper tape (46) to the sealant layer (1) on the opposing rear flap film (48).

There are no particular limitations on the method for joining this watertight joint (47), but for example, if the material is a thermoplastic resin such as a polyolefin resin, it can be done by heat sealing.

In addition, the packaging bag (100) according to the present invention has a scratch treatment (9) between the fitting portion (2) of the zipper tape (46) and the watertight joint, and in the example shown in Figure 3, the scratch treatment is provided in the flap rear film (48) by half-cutting, excluding the sealant layer (1).

Figure 4 is a schematic partial cross-sectional view illustrating another embodiment of the structure of the zipper tape, watertight joint, and automatic steam release mechanism provided on the flap in the packaging bag according to the present invention.

In the example shown in FIG. 4, the watertight joint (47) is formed by joining the opposing sealant layers (1) of the flap rear film (48) and the flap front film (49) of the flap (40).

This watertight joint (47) can prevent the liquid in the contents from leaking out to the fitting part (2) of the zipper tape (46) even if pressure is applied from the contents due to an external force, and can also prevent the contents from coming into contact with the fitting part (2) of the zipper tape (46) even if no pressure is applied from the contents.

There are no particular limitations on the method for joining this watertight joint (47), but for example, if the material is a thermoplastic resin such as a polyolefin resin, it can be done by heat sealing.

In addition, the packaging bag (100) according to the present invention has a scratch treatment (9) between the fitting portion (2) of the zipper tape (46) and the watertight joint, and in the example shown in FIG. 4, the scratch treatment is provided by half-cutting the flap rear film (48) and the flap front film (49).

Figure 5 is a schematic partial cross-sectional view illustrating yet another embodiment of the structure of the zipper tape, watertight joint, and automatic steam release mechanism provided on the flap in the packaging bag according to the present invention.

In the example shown in FIG. 5, the watertight joint (47) is formed by joining the bases of opposing zipper tapes (46).

This watertight joint (47) can prevent the liquid in the contents from leaking out to the fitting part (2) of the zipper tape (46) even if pressure is applied from the contents due to an external force, and can also prevent the contents from coming into contact with the fitting part (2) of the zipper tape (46) even if no pressure is applied from the contents.

There are no particular limitations on the method for joining this watertight joint (47), but for example, if the material is a thermoplastic resin such as a polyolefin resin, it can be done by heat sealing.

In addition, the packaging bag (100) according to the present invention has a scratch treatment (9) between the fitting portion (2) of the zipper tape (46) and the watertight joint. In the example shown in FIG. 5, the scratch treatment (9) is provided all the way through the flap rear film (48) and the flap front film (49), including the base of the zipper tape (46).

Figure 6 is a schematic partial cross-sectional view illustrating how the zipper tape engagement portion in the flap is released from the tip side of the flap in the packaging bag according to the present invention.

In the example shown in Figure 6, in order to release the fastening portion of the zipper tape provided on the flap from the tip side of the flap, the flap front film (49) is pulled in the direction of the arrow (B) in the figure, and the flap rear film (48) is pulled in the direction of the arrow (C) in the figure, in order to release the fastening portion (2).

The strength of the zipper tape (46) when opened from above is the external fitting strength, which is a value that directly relates to the openability of the flap (40). Conversely, the strength of the zipper tape (46) when opened from below is the internal fitting strength, which is a value that also relates to the steam permeability of the packaging bag (100).

The zipper tape (46) used in the present invention has a cross section of the mating portion (2) perpendicular to its longitudinal direction that is asymmetrical from top to bottom, and as shown in Figures 3 to 5, due to the mating form being asymmetrical from top to bottom with respect to the center line (A), in the upper half of the mating portion (2) above the center line (A), the male and female mating portions (2) are fitted together at an angle that makes it relatively easy to disengage. As shown in Figure 6, it can be seen that in the mating portion (2) above the center line (A), the engagement hook is easily disengaged.

On the other hand, in the lower half of the mating part (2) below the center line (A), the male and female parts are mated at an angle that makes it relatively difficult for them to come apart. Therefore, if you try to release the mating, the male and female parts will bite into each other and get caught.

In other words, in the upper half of the center line (A) of the mating portion (2), the male and female relationship of the zipper tape (46) is such that they are easily disengaged by forces in the directions of the arrows (B) and (C) that attempt to release the mating.

This is effective when attempting to open the flap (40) from its tip side. In the above-mentioned example of use, this is effective in facilitating the work of creating an opening in the flap (40) when adding additional ingredients or toppings to be cooked before heating and cooking.

In contrast, in the lower half of the fitting portion (2) below the center line (A), the male and female relationship of the zipper tape (46) is fitted at an angle that makes it difficult for the force trying to release the fitting to come loose, resulting in a difference between the upper half and lower half of the center line (A). This is effective in maintaining the airtightness of the packaging bag (100) when force is applied from inside the packaging bag.

Therefore, the automatic steaming mechanism is activated when the internal pressure of the packaging bag (100) reaches a certain value due to the generation of steam during cooking, and a tear is formed in the relatively weak scratching process (9) on the flap (40).

In other words, since the scratched portion (9) is vulnerable to pressure, this portion becomes a tear and is the first portion to connect the inside and outside of the packaging bag (100), effectively functioning as an automatic steam-passing mechanism. Once steam has passed through, the internal pressure inside the packaging bag (100) drops rapidly, avoiding the risk of the bag breaking.

In addition, since the zipper tape (46) is asymmetrical with respect to the center line (A), when comparing the inner fitting strength of the flap (40) from the content side and the outer fitting strength of the flap from the intended opening line (45) side,
The inner fitting strength can be made greater than the outer fitting strength.

In other words, when this relationship exists, in the flap (40) portion of the packaging bag (100), when opening the flap (40), the zipper tape (46) can be released from the intended opening line (45) side of the flap, i.e., opening can be performed relatively easily using fingers, etc.

On the other hand, the release of the zipper tape (46) from the contents side is relatively resistant, so when adding cooking ingredients and cooking, it is possible to avoid opening before the automatic steam mechanism is activated if the internal pressure rises, and it is also advantageous in terms of resistance to the load of internal pressure from inside the packaging bag, such as resistance to dropping.

In addition, during our thorough investigation of the packaging bag (100) according to the present invention, we found the following specific values for the internal fitting strength and external fitting strength:

The fitting strength can be set to 70% or more of the seal strength of the side end (5) of the packaging bag (100) under the conditions of a test environment of 23°C and a pulling speed of 300 mm/min. The outer fitting strength can be set to 20 N/15 mm or less. As mentioned above, when both are in this range, it is possible to realize a packaging bag that combines better distribution resistance and better openability.

In this way, it is possible to provide a packaging bag (100) with a plastic film base material that is suitable for mechanical filling in an automatic filling machine, is self-supporting, and has an automatic steam release mechanism so that it can be heated and cooked in a microwave oven, and has a zipper tape.

Here, we will explain the materials used for each element of the packaging bag (100) according to the present invention.

The packaging bag (100) according to the present invention is made of a film with a sealant layer. In other words, it is made of a laminate having a sealant layer using a plastic film as a substrate. In addition, the laminate may contain layers having necessary functions, such as a gas barrier layer for the purpose of improving the storage stability of the contents. The lamination can be performed using a known lamination method.

The plastic film is a film made of a polymer resin composition, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc., and is selected appropriately depending on the application of the packaging bag (100).

In particular, polypropylene and polyethylene terephthalate are more preferable in terms of film strength and cost when used as plastic films. In addition, when using oriented polyamide film, it is possible to impart toughness to the laminate against punctures and impacts.

The plastic film can also be laminated with other layers via an adhesive layer to form a laminate. The layer structure, material composition, thickness, etc. of the laminate can be designed appropriately according to the required quality of the packaging bag (100).

For example, to improve the preservation quality of the contents, an opaque layer that blocks ultraviolet light, such as a colored film, can be provided in the laminate that constitutes the packaging bag (100). Alternatively, a gas barrier layer can be provided in the laminate. For example, a gas barrier film can be used, which is made by providing a gas barrier layer on the surface of a plastic film.

Metal foils such as aluminum and metal deposition films are also effective as gas barrier layers, but
Microwave ovens are not suitable for cooking because of the high frequency waves that can cause sparks.

In the case of gas barrier films, the plastic film used is a film made of a polymer resin composition, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc., and is selected appropriately depending on the application. In particular, polypropylene and polyethylene terephthalate are more preferable in terms of film strength and price when used as the plastic film substrate.

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

For example, urethane acrylate can be used for the anchor coat layer of the gas barrier film. The anchor coat layer can be formed by applying a coating method that applies a printing technique such as gravure coating with a paint in which a resin is dissolved in a solvent, or by using other commonly known coating methods.

The deposition layer can be formed by coating an inorganic compound such as SiO or AlO onto a plastic film with an anchor coat layer using a vacuum deposition method, forming an inorganic compound layer by the vacuum deposition method. The thickness of the deposition layer should be 15 nm to 30 nm.

On top of this inorganic compound layer formed by vacuum deposition, a further layer can be formed by wet coating. For this purpose, a coating agent is applied to the film and the base is an aqueous solution or a water/alcohol mixed aqueous solution containing at least one of a water-soluble polymer and (a) one or more alkoxides or their hydrolysates, or both, or (b) tin chloride, and then heated and dried to form an inorganic compound layer by coating, forming a coating layer. In this case, a silane monomer can be added to the coating agent to improve adhesion with the anchor coat layer.

Although the inorganic compound layer formed by the vacuum deposition method alone has gas barrier properties, a gas barrier layer can be formed by overlaying an inorganic compound layer formed by the wet coating method on an inorganic compound layer formed by the vacuum deposition method.

By combining these two layers, a reaction layer between the inorganic compound layer formed by the vacuum deposition method and the inorganic compound layer formed by the wetting method is generated at the interface between the two layers, or the inorganic compound layer formed by the wet coating method fills and reinforces defects or micropores such as pinholes, cracks, and grain boundaries that occur in the inorganic compound layer formed by the vacuum deposition method, forming a dense structure.

As a result, it achieves high gas barrier properties, moisture resistance, and water resistance as a gas barrier film, and is flexible enough to withstand deformation caused by external forces, making it suitable for use as a packaging material.

In addition, 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 packaging bag. These can be used appropriately depending on the application and required quality. In addition, when a printed layer is provided on the packaging bag (100), it is possible to make a part of the bag a window by leaving the printed layer unprovided.

The sealant layer (1) allows two laminates to be stacked with the sealant layers facing each other, and then bonded together by applying heat and pressure, for example by heat sealing, to form a packaging bag (100).

As the material for the sealant layer (1), a polyolefin resin is generally used among thermoplastic resins. Specifically, low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), and linear low-density polyethylene resin (LLDPE) can be used.

In addition, ethylene-based resins such as ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-methacrylic acid resin copolymer, blend resins of polyethylene and polybutene, and polypropylene-based resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer can be used.

The sealant layer (1) can be formed by forming a layer on the laminate by using an extruder or the like to produce a film from molten resin. Alternatively, a sealant layer can be formed on the surface of the laminate by laminating a material that has already been produced in the form of a film.

In the present invention, the flap (40) is provided with a zipper tape (46) that extends in the width direction as an opening and closing section, and the material of the zipper tape (46) can be, for example, polypropylene resin, polyethylene resin, ethylene-propylene copolymer resin, etc.

When these resins are used, it is possible to join the bases of the zipper tape (46) to each other or to the sealant layer (1) of the opposing flaps (40) by heat sealing or the like, forming a watertight joint (47).

Alternatively, the watertight joint (47) can be formed by joining the sealant layers of the flaps (40). When the watertight joint (47) is formed in this manner, no separate material is required, which is advantageous in terms of cost.

If necessary, a printed layer can be provided on the layer of the laminate based on a plastic film that is visible from the outside of the packaging bag in order to improve the product's image, display necessary information about the contents, and improve the design. The printed layer may also be provided on the outermost layer of the packaging bag.

The printed layer may be provided on a part of the packaging bag, or may be provided over the entire surface of the packaging bag. Alternatively, a display portion may be provided without using a printed layer, for example by attaching a printed sticker to the surface of the packaging bag.

There are no particular restrictions on the selection of printing method and printing ink, but any known printing method may be selected appropriately, taking into consideration printability on plastic film, design such as color tone, adhesion, and safety as a food packaging bag.

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

In this way, it is possible to provide a packaging bag (100) with a zipper tape that is made of a plastic film as a base material, has mechanical filling suitability in an automatic filling machine, is self-supporting, and has an automatic steam release mechanism so that it can be heated and cooked in a microwave oven.

The present invention will be explained in more detail below with reference to examples and comparative examples. However, the present invention is not limited to the examples shown here. The present invention is defined by the claims.

A packaging bag for evaluation was prepared, filled with the contents, and the evaluation was carried out.
The material composition of the packaging bag is as follows:
From the outside of the packaging bag,
Polyethylene terephthalate film (thickness 12 μm) + inorganic compound gas barrier layer / adhesive layer / polyamide film (thickness 15 μm) / adhesive layer / non-oriented polypropylene film layer (thickness 60 μm)
It was decided.
Zipper tape: In the examples, it was attached to the inside of the flap, and in the comparative examples, it was attached by sealing to the inside of the body of the packaging bag.

The materials of each layer are as follows:
Polyethylene terephthalate film/inorganic compound gas barrier layer: GL-ARH manufactured by Toppan Printing Co., Ltd. was used as the gas barrier film.
Polyamide film: ONMB-RT manufactured by Unitika Ltd. was used.
Unstretched polypropylene film: ZK207 manufactured by Toray Film Processing Co., Ltd. was used.
Adhesive layer (dry lamination): Base agent/curing agent = A626/A50 = 8/1 manufactured by Mitsui Chemicals, Inc. The coating amount was 3.5 g/m ² (dry).
Zipper tape: Made of polypropylene (including ethylene-propylene copolymer).

The packaging bag configuration is as follows:
FIG. 7 is a schematic plan view for explaining the configuration of an embodiment of a packaging bag according to the present invention.

The example shown in Fig. 7 is referred to as Type A. This shape is within the scope of the present invention, and the dimensions etc. are as follows.
Height: 170mm
Left and right: 170mm
The filling opening is provided at the top edge of the packaging bag.
Flap one way: 20mm
Bottom film one way: 35-45mm (3 levels)
Each seal width: 10mm
Seal strength of side edge (5): 50N/15mm
It was decided.
Between the fitting portion of the zipper tape (46) and the watertight joint portion (47), a scratch processing (9) is provided as an automatic steam passing mechanism.

Figure 8 is a schematic plan view illustrating the configuration of a comparative example of a packaging bag according to the present invention.

The example shown in Fig. 8 is referred to as Type B. However, the shape of Type B deviates from the range defined in the present invention and is therefore used as a comparative example.
The dimensions etc. are as follows:
Height: 170mm
Left and right: 170mm
There is no flap, and the filling opening is at the side edge of the packaging bag. These are the differences from Type A.
Bottom film one way: 35-45mm (3 levels)
Each seal width: 10mm
Seal strength of side edge (5): 50N/15mm
It was decided.
In particular, in the B type, a weak fitting portion (39) is provided as an automatic steam passing mechanism at a part of the fitting portion of the zipper tape (46), which is also different from the A type.

(Rating 1)
First, as Evaluation 1, evaluation was carried out on two items (1. Suitability for automatic filling machines, 2. Self-supporting ability after cooking in a microwave oven).
The evaluation items, evaluation methods, and evaluation criteria are as follows.

1. The packaging bags used for the automatic filling machine suitability evaluation were "Nippon Ham Co., Ltd. Microwaveable Fuwatama (registered trademark) Omelette with Bacon." The contents were filled using an automatic filling machine.
The automatic filling machine is a Toyo Jidosha Co., Ltd. TT-9CW3.

The evaluation criteria were as follows: for n=50 samples, no errors were rated as ◯, and even one error was rated as ×.

2. After cooking in the microwave oven, the zipper tape of the self-supporting flap was opened, and the egg liquid made by beating two medium-sized raw eggs was poured into the flap through the flap and stirred to mix.
Next, the packaging bag was placed in a microwave oven while standing upright, and cooking was performed.
The heating conditions were 500 W for 4 minutes and 30 seconds.
The microwave oven used was a turntable type: MM720CUKN2 GY manufactured by Nitori Co., Ltd.

The evaluation criteria were as follows: out of 10 samples, those that maintained their independence were rated as O, and those that had even one collapsed were rated as ×.

First, using Examples 1 to 3 and Comparative Examples 1 to 3, Evaluation 1 (1. Suitability for automatic filling machines, and 2. Self-supporting ability after microwave cooking) was performed.

Example 1
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
In particular, the bottom film one-way length was set to 35 mm.

Example 2
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
In particular, the bottom film one-way length was set to 40 mm.

Example 3
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
In particular, the bottom film one-way length was set to 45 mm.

<Comparative Example 1>
A packaging bag having a type B shape shown in FIG. 8 was produced.
The dimensions etc. are as follows:
Height: 170mm
Left and right: 170mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
In particular, the bottom film one-way length was set to 35 mm.

<Comparative Example 2>
A packaging bag having a type B shape shown in FIG. 8 was produced.
The dimensions etc. are as follows:
Height: 170mm
Left and right: 170mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
In particular, the bottom film one-way length was set to 40 mm.

<Comparative Example 3>
A packaging bag having a type B shape shown in FIG. 8 was produced.
The dimensions etc. are as follows:
Height: 170mm
Left and right: 170mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
In particular, the bottom film one-way length was set to 45 mm.

The evaluation results for Evaluation 1, using Examples 1 to 3 and Comparative Examples 1 to 3, are shown in Table 1.

As is clear from the results shown in Table 1, in Examples 1 to 3, which are packaging bags (100) according to the present invention, both the evaluation items of suitability for automatic filling machines and self-supporting ability after microwave cooking were rated as ◯, indicating that it is possible to achieve both in a more stable manner.

In other words, suitability for automatic filling machines depends on the opening width or area of the filling opening, while the ability to stand on its own after microwave cooking depends on the area of the bottom surface, and in the shape of Type A packaging bags, the two can be designed independently of each other.

Therefore, by making the opening width the full width of the packaging bag and making the bottom tape fold-in length sufficient, it is possible to stably achieve both suitability for automatic filling machines and self-supporting after microwave cooking.

On the other hand, in the packaging bags of Comparative Examples 1 to 3 that are not in accordance with the present invention, the suitability for automatic filling machines was sometimes rated as x, indicating that compatibility between suitability for automatic filling machines and self-supporting properties after microwave cooking was not consistently achieved.

In other words, as mentioned above, suitability for automatic filling machines depends on the processing width or opening area of the filling opening, while the ability to stand on its own after microwave cooking depends on the area of the bottom surface, and since there is a trade-off between the two in the shape of Type B packaging bags, this shows that it is difficult to stably achieve both suitability for automatic filling machines and ability to stand on its own after microwave cooking.

(Rating 2)
Next, in Evaluation 2, the relationship between the strength of the watertight joint and (3. Drop resistance of the packaging bag, 4. Openability of the watertight joint) was evaluated.
Samples were prepared with six different levels of watertight joint strength ranging from 1N/15mm to 25N/15mm.
The evaluation items, evaluation methods, and evaluation criteria are as follows.

Evaluation 2 evaluates the usability of the packaging bag after cooking, and aims to evaluate the strength of the optimal watertight joint that allows for both ease of opening the flap and drop resistance.

3. Drop resistance of packaging bag: A packaging bag filled with contents by an automatic filling machine was dropped repeatedly 10 times from a height of 120 cm to check for damage to the watertight joints.
The evaluation criteria were as follows: no damage was rated as ◯, and damage was rated as ×.

4. Openability of watertight joints: The ease of opening the watertight joints using fingers was evaluated. The evaluation score was calculated as the average value based on the evaluations of five evaluators.

The evaluation criteria are as follows:
The evaluation was made on a 5-point scale, with 5 being a score for something that was felt to be easy to open and 1 being a score for something that was felt to be difficult to open.
A rating of 3 or more was deemed to be acceptable.

Example 4
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the breaking strength of the watertight joint was set to 25 N/15 mm.

Example 5
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the breaking strength of the watertight joint was set to 20 N/15 mm.

Example 6
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the breaking strength of the watertight joint was set to 15 N/15 mm.

Example 7
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the breaking strength of the watertight joint was set to 5N/15mm.

Example 8
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the breaking strength of the watertight joint was set to 3N/15mm.

<Example 9>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the breaking strength of the watertight joint was set to 1 N/15 mm.

The results of the evaluation using Examples 4 to 9 are shown in Table 2.

From the results shown in Table 2, in the case of a packaging bag having a type A shape according to the present invention, if the breaking strength of the watertight joint (47) is 3 N/15 mm or more, the packaging bag can pass the drop resistance test, and if the breaking strength of the watertight joint (47) is 20 N/15 mm or less, the openability of the watertight joint can be judged as acceptable.

Therefore, if the breaking strength of the watertight joint (47) is in the range of 3 N/15 mm to 20 N/15 mm, it is possible to achieve both drop resistance and ease of opening the watertight joint, making it possible to produce a stronger and more user-friendly packaging bag (100).

(Rating 3)
Next, as evaluation 3, the zipper tape outer fitting strength and (5. Opening property of zipper tape) were evaluated.
The zipper tape outer fitting strength was varied from 5 N/15 mm to 30 N/15 mm, and six different samples were prepared.
The evaluation items, evaluation methods, and evaluation criteria are as follows.

Evaluation 3 evaluates the usability of the packaging bag after cooking, and aims to evaluate the optimal strength of the zipper tape outer fitting that does not impair the ease of opening the flap.

5. Ease of opening zipper tape: The ease of opening the zipper tape using fingers was evaluated. The evaluation score was calculated as the average value based on the evaluations of five evaluators.

The evaluation criteria are as follows:
The evaluation was made on a 5-point scale, with 5 being a score for something that was felt to be easy to open and 1 being a score for something that was felt to be difficult to open.
A rating of 3 or more was deemed to be acceptable.

Example 10
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the outer fitting strength of the zipper tape was set to 5 N/15 mm.

Example 11
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the outer fitting strength of the zipper tape was set to 10 N/15 mm.

Example 12
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the outer fitting strength of the zipper tape was set to 15 N/15 mm.

Example 13
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the outer fitting strength of the zipper tape was set to 20 N/15 mm.

<Example 14>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the outer fitting strength of the zipper tape was set to 25 N/15 mm.

Example 15
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the outer fitting strength of the zipper tape was set to 30 N/15 mm.

The evaluation results are shown in Table 3.

From the results shown in Table 3, in the packaging bag of type A according to the present invention, when the outer fitting strength of the zipper tape (46) was set to 20 N/15 mm or less, the packaging bag was given a pass rating of 3.0 or more for the ease of opening. Therefore, by setting the outer fitting strength of the zipper tape (46) within this range, it is possible to make the packaging bag (100) easier to use.

(Rating 4)
Next, as evaluation 4, the length of the scratching and (6. Distribution durability of packaging bags) were evaluated.
The length of the scratch processing was set to a ratio of 5% to 50% of the opening width (150 mm) at the top edge of the packaging bag, and six samples were prepared.
The evaluation items, evaluation methods, and evaluation criteria are as follows.

Evaluation 4 evaluates the suitability of the packaging bag (100) for transportation, and aims to evaluate the optimal range that does not impair distribution resistance.

6. Distribution durability: The number of breakages in the scratched part was confirmed in the level 1 vibration test of JIS Z 0232. The samples were packaging bags filled with contents by an automatic filling machine, and five cardboard cases containing 10 bags were used. The number of samples in which breakage was observed in the scratched part was counted.
The evaluation criteria was that no damage was observed.

<Example 16>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 5% (7.5 mm).

<Example 17>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 10% (15 mm).

<Example 18>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 20% (30 mm).

<Example 19>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 30% (45 mm).

<Example 20>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 40% (60 mm).

<Example 21>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 50% (75 mm).

The evaluation results are shown in Table 4.

In the results shown in Table 4, in the case of the packaging bag of type A according to the present invention, when the length of the scratch processing is 30% (45 mm) or less of the opening width of 150 mm, the number of breaks in the scratch processing part in the level 1 vibration test of JIS Z 0232 was evaluated to be zero. In other words, by being in this range, it is possible to make a packaging bag that is more suitable in terms of distribution resistance.

(Rating 5)
Next, as Evaluation 5, (7. Suitability for steam passage) was evaluated.
The length of the scratch processing (9), which was determined to be optimal in Evaluation 4, was set in the range of 5% to 30%, and the optimal range was evaluated for the relationship between the ratio of the zipper tape inner fitting strength to the side seal strength and the steam permeability.
The evaluation items, evaluation methods, and evaluation criteria are as follows.

7. Steam permeability:
The zipper tape (46) of the flap (40) was opened, and the mixture of two medium-sized raw eggs was poured in and stirred.
Next, the packaging bag (100) was placed in a microwave oven while standing upright, and cooking was performed.
The heating conditions were 500 W and 4 minutes and 30 seconds.
The microwave oven used was a turntable type: MM720CUKN2 GY manufactured by Nitori Co., Ltd.

Evaluation 5 evaluates the steam permeability of the packaging bag (100), and aims to evaluate the optimum range of the scratch length (%, mm) that does not impair the steam permeability, and 5. the ratio (%) of the zipper tape inner fitting strength to the side seal strength.

The ratio (%) of the zipper tape inner fitting strength to the side seal strength (50N/15mm) was evaluated at 13 levels between 5% and 120%.
The evaluation criteria were as follows: ◯: steam passed through scratch processing (9); ×: steam passed through any processing other than scratch processing (9).

<Example 22>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 5% (7.5 mm).

<Example 23>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 10% (15 mm).

<Example 24>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 20% (30 mm).

<Example 25>
A packaging bag having a type A shape shown in FIG. 7 was produced.
Height: 170mm
Left and right: 170mm
Flap one way: 20mm
Each seal width: 10mm
Seal strength of the seal portion (6) of the side end portion (5): 50N/15mm
It was decided.
Bottom film one-way length: 40 mm.
In particular, the ratio of the scratch length to the opening width was set to 30% (45 mm).

The evaluation results are shown in Table 5.

The results shown in Table 5 indicate that in the packaging bag (100) of the A-type shape according to the present invention, taking into account the flow resistance shown in Table 4, a ratio of the zipper tape inner fitting strength to the side seal strength (50 N/15 mm) of 70% or more is more suitable for steam permeability. In other words, it is possible to realize a packaging bag (100) that combines flow resistance and steam permeability.

In this way, it has been verified that the present invention can provide a packaging bag having a plastic film base, which is suitable for mechanical filling in an automatic filling machine, is self-supporting, and has an automatic steam release mechanism so that it can be used for cooking in a microwave oven, and which has a flap and a zipper tape.

1 ... sealant layer 2 ... fitting portion 3 ... height position of flap 5 ... side end 6 ... seal portion 7 ... seal portion 8 ... upper edge 9 ... scratch processing 10 ... front body portion 12 ... cut 13 ... planned opening line of body portion 14 ... bottom film 15 ... fold line 16 ... cut 20 ... rear body portion 30 ... body portion 39 ... weak fitting portion 40 ... flap 41 ... tip portion 42 ... seal portion 43 ... seal portion 44 ... side end portion 45 ... planned opening line of flap 46 ... zipper tape 47 ... watertight joint portion 48 ... flap rear film 49 ... flap front film 50 ... bottom 100 ... packaging bag A ... center line B ... arrow C ... arrow

Claims (3)

A packaging bag made of a film having a sealant layer, the bag enabling the contents to be heated and cooked in a microwave oven,
The packaging bag has a space inside capable of storing contents, and is composed of a front body, a rear body, a bottom, and a flap.
The front and rear torso sections are sealed at the left and right side edges,
The upper side of the body portion is an opening for mechanical filling, which allows the contents to be filled, and after filling, the front body portion and the rear body portion are sealed to seal the packaging bag.
Below the top seal, there is a line along the width of the package to indicate where the package should be opened.
At a lower portion of the body portion, a bottom film is expandably folded and sealed between the front body portion and the rear body portion to form a bottom portion;
This bottom allows the packaging bag to stand on its own,
The upper part of the front body has a flap that protrudes diagonally upward from the body.
The flap is formed by overlapping a flap rear film that continues from above the packaging bag beyond the height position of the flap and a flap front film that continues from below the packaging bag beyond the height position of the branch with the sealant layers facing each other, sealing the side end of the flap, and closing the tip of the flap by sealing or folding back,
The flap has the following parts starting from its tip:
There is a line along the width of the flap to open it.
Next, a fitting portion is provided in the width direction by a zipper tape made of a thermoplastic resin,
Furthermore, a watertight joint is provided in the width direction on the inside of the zipper tape fitting,
The watertight joint separates the zipper tape fitting from the content storage space of the packaging bag,
Between the zipper tape fitting and the watertight joint, half-cut or full-through scratches are provided on either or both of the flap front film and the flap rear film .
The number of the fitting portions provided on the flap is one,
The watertight joint is formed by joining the bases of the opposing zipper tapes together, or by joining the base of one zipper tape and the sealant layer of the opposing flap, or by joining the sealant layers of the opposing flaps together, and the breaking strength of the watertight joint is in the range of 3N/15mm to 20N/15mm;
The scratch processing is provided with a length in the range of 5% to 30% of the total width of the opening of the flap of the packaging bag.
A packaging bag characterized by the above. The fastener tape has a cross section of a fitting part perpendicular to its longitudinal direction that is asymmetrical up and down with respect to a center line, and the inner fitting strength from the contents side of the flap and the outer fitting strength from the tip side of the flap are as follows:
2. The packaging bag according to claim 1 , wherein the inner fitting strength is greater than the outer fitting strength. The zipper tape has an inner fitting strength of 70% or more of the sealed portion of the side end of the packaging bag, and an outer fitting strength of 20N/15mm or less.
The packaging bag according to claim 1 or 2 .

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