JP2020128249A - Packaging bag for liquid - Google Patents

Abstract

To provide a packaging bag for liquid whose base material is a plastic film, which is easy to pour out liquid of contents, capable of folding after pouring out the liquid of the contents, and capable of keeping a folded state without requiring another member.SOLUTION: A packaging bag for liquid whose base material is a plastic film is made by forming a body portion front side laminated body and a body portion back side laminated body. A part of a periphery part includes a pouring port. The pouring port can form an opening portion by cutting a part of the laminated body. On an upper side of the body portion, a seal portion on both of right and left end portions is provided with a hole penetrating the front and back. The body portion of the packaging bag can be sequentially folded more than one time after pouring out liquid. The folded body portion can be fixed by inserting a part of a corner of a folding line into the hole.SELECTED DRAWING: Figure 1

Description

The present invention relates to a liquid packaging bag of packaging containers. In particular, a packaging bag that uses a plastic film as a base material and can easily and stably pour out the inner solution, and has a spout that is manufactured by heat-sealing the peripheral edge of the packaging bag. It's about bags.

Conventionally, a packaging bag made of a laminated body having a sealant layer using a plastic film as a base material is not limited to a case where a layer other than the sealant layer is composed of a single layer of a plastic film, and other films, resin layers, metal foils, etc. One of the features of the laminated body is that it is possible to design the layer structure and materials according to the required quality of the inner solution, and is widely used for various purposes.

In particular, the liquid packaging bag having the spout is excellent in the purpose of pouring out the liquid internal solution. For example, it is widely used for beverages and food applications, and is also suitably used for pasty foods as well as liquids. There are also other examples of use as seasonings such as miso, and it is often advantageous over glass bottles and cans in terms of performance as a packaging material and in terms of cost.

Besides, for example, it is not limited to edible oil, sauces, beverages such as coffee beverages, foods, liquid detergents, toiletry products such as softeners, industrial products such as engine oil, etc., if it is a liquid or paste internal solution It can be easily filled and stored in a packaging bag, and it can also have excellent storability depending on the application.

In addition, recently, we have stopped using plastic and glass bottles as disposable items, and from the perspective of environmental protection, there is a trend to reduce waste by using refillable containers. The demand for a packaging bag made of a laminated body having is particularly increasing.

Generally, the packaging bag has a function of displaying information on the internal solution and storing it inside the packaging bag to protect the internal solution from the external environment and also to store it. Ease of taking out is important, especially in the case of a fluid, the ease of pouring out is important, and there are various forms and material configurations depending on the internal solution and its purpose.

In particular, regarding the ease of pouring out, when opening the packaging bag and then taking it out from the opening, it is not only stable and easy to pour out, but it may spill outside or your hands get dirty. Is inconvenient, and it is desirable that the opening maintains its shape stably. This is also a particular requirement for refill containers.

Further, when the packaging container for liquid is discarded after pouring out the content liquid, the packaging container may be bulky as a waste, and an improvement method is expected.

Alternatively, when discarded, the content liquid that has accumulated on the bottom of the packaging bag or that has adhered to the inner wall of the packaging bag may drip from the opening, which is regarded as a problem in terms of hygiene and handling.

In response to this, Patent Document 1 proposes a pouch container with a spout, which can prevent liquid dripping at the time of discarding by the spout, and can fold the pouch to engage with the spout to make the folded state. Although a pouch container that can be maintained has been proposed, since the spout is a separate member from the pouch container, the material cost and the manufacturing cost are increased, and the spout itself is also a waste. have.

JP, 2017-165470, A

The present invention has been made in view of such circumstances, and in a liquid packaging bag using a plastic film as a base material, the liquid of the contents is easily poured out, and the liquid of the contents is poured out. An object of the present invention is to provide a liquid packaging bag that can be folded later and can be maintained in a folded state without requiring a separate member.

As means for solving the above problems, the invention according to claim 1 is
A packaging bag for liquids,
The packaging bag comprises a laminate having at least a sealant layer using a plastic film as a base material,
The packaging bag comprises a front laminated body and a rear laminated body that form a body portion and seals a peripheral edge portion with the sealant layers facing each other, and has a pouring opening in a part of the peripheral edge portion. And
The pouring opening is capable of forming an opening by cutting a part of the laminate.
On the upper side of the body part, the left and right seal parts are provided with holes penetrating the front and back,
The packaging bag, after pouring out the liquid, the body can be folded one or more times in sequence,
The body part that is folded and overlapped is a liquid packaging bag in which corner portions of the folding line can be inserted and fixed in the holes.

The invention according to claim 2 is
In the liquid packaging bag according to claim 1, the length from the bottom end of the body to the upper end of the body (height of the body) is T1, the width of the first folding is T2, and the number of foldings is When N,
T1=T2×(N+1)+3 to 8 mm×N
It is a packaging bag for liquids, characterized in that

Further, the invention described in claim 3 is
The bottom part is a stack of bottom plates folded with the sealant layer on the outside between the stack on the front side of the body in the lower part of the body and the stack on the back side of the body, so that the bottom plate can be expanded. The liquid packaging bag according to claim 1 or 2, wherein the sealants are sealed with each other.

Further, the invention according to claim 4 is
A branch is provided on the front side of the body of the packaging bag and on the back side of the body,
The branch has a folding line that can be folded in either the upward or downward direction of the trunk at the height of the trunk in the trunk,
The branch is formed by stacking an upper body laminated body continuous from the upper side of the body and a lower body laminated body continuous from the lower side of the body, and sealing the side end and the tip. The liquid packaging bag according to any one of claims 1 to 3.

Further, the invention according to claim 5 is
The liquid according to claim 4, wherein a difference between the length from the tip of the branch to the folding line and the length from the folding line to the bottom end of the body is within 10 mm. It is a packaging bag.

The invention according to claim 6 is
The spout is provided so as to protrude outward from the upper side of the peripheral portion of the body, and the opening of the spout can be sandwiched and fixed to the body that is folded and fixed. The liquid packaging bag according to any one of claims 1 to 5.

The invention according to claim 7 is
7. The liquid packaging bag according to any one of claims 1 to 6, wherein the folding of the body is indicated by a position for folding and is visible from the outside of the packaging bag.

Further, the invention according to claim 8 is
8. The liquid packaging bag according to claim 7, wherein the folding position is subjected to a folding guide process that facilitates folding.

According to the present invention, in a liquid packaging bag having a plastic film as a base material, it is easy to pour out the liquid of the contents, and it is foldable after pouring out the liquid of the contents and folded. It is possible to provide a liquid packaging bag that can maintain the state without requiring a separate member.

Particularly, according to the invention described in claim 2, the length from the bottom end of the body to the upper end of the body (height of the body) is T1, and the width of the first folding is T2.
When the number of folds is N,
T1=T2×(N+1)+3 to 8 mm×N
By satisfying the condition (1), it is possible to set the corners of the fold line to an appropriate position where it is easy to fix in the hole by one or more successive foldings.

This is the height of the body of the packaging bag, which is obtained by adding a margin of 3 to 8 mm per folding to the integral multiple of the width of the first folding.

That is, in addition to the number of folds, the thickness of the body due to folding is increased, and a space for inserting the folded body into the hole is added to quantify the width of the fold, thereby optimizing the fold. It is possible to convert. This can facilitate the insertion of the folded corner portion into the hole and also its fixing.

According to the invention described in claim 3,
The bottom part can be expanded by inserting a bottom plate laminate in which a sealant layer is folded outside between the body part front part laminate and the body part rear part laminate in the lower part of the body part. By sealing the sealants with each other, the packaging bag is provided with self-supporting property, and the internal capacity can be increased.

According to the invention described in claim 4,
A branch is provided in the body front stack of the packaging bag, and the branch can be folded back either upward or downward in the folding line at the height position of the branch in the body. The upper front torso stack that is continuous from above the front torso and the lower front torso stack that is continuous from below the front torso are stacked, and the side end and the tip are sealed to form the trunk. It can be a packaging bag having a branch.

By this branch, this portion can be used as a filling port for the contents. Since the packaging bag according to the present invention has the pouring port protruding from the part of the peripheral portion of the body portion to the outside of the packaging bag, it is difficult to focus the contents from this portion, and the tip portion of the branch is The filling bag can be filled with the contents and then sealed to seal the packaging bag.

Further, when pouring out the content liquid, by folding the branch downward, a stable flow path can be secured. Alternatively, in a sales scene, by folding back the branch, this portion can be used as a display portion of the product.

According to the invention described in claim 5,
The difference between the length from the tip of the branch to the folding line at the height of the branch and the length from the folding line at the height of the branch to the bottom end of the trunk is within 10 mm. It is possible to easily fold the folded body with the body overlapped and insert the corners of the folding line into the holes.

According to the invention described in claim 6,
The spout is provided so as to project outward from the upper side of the peripheral edge of the body, and when the body is folded and the corners of the fold line are inserted into the holes, the body is folded and overlapped. Since it is possible to insert and fix the opening of the pouring port into the container, it is possible to fold it into a smaller size at the time of disposal, and it is possible to prevent accidental leakage of the remaining content liquid.

According to the invention described in claim 7,
The folding of the body is highly convenient because the position for folding is shown and it is visible from the outside of the packaging bag so that the folding operation can be performed more easily and accurately.

Further, in particular, according to the invention described in claim 8, the folding operation is performed at the folding position so that the folding can be performed easily, so that the folding work can be performed more easily and accurately. Because it can be done, it is more convenient.

FIG. 1 is a schematic plan view of a liquid packaging bag as seen from the front side, for explaining one embodiment of the liquid packaging bag according to the present invention. FIG. 2 is a schematic plan view of the liquid packaging bag as seen from the rear side, for explaining one embodiment of the liquid packaging bag according to the present invention. FIG. 3 is a front view of the liquid packaging bag for explaining the state in which the branch provided on the body rear stack is folded back in one embodiment of the liquid packaging bag according to the present invention. It is a plane (partial perspective) schematic diagram. FIG. 4 is a schematic perspective view for explaining a state in which the liquid of the contents is poured out in one embodiment of the liquid packaging bag according to the present invention. FIG. 5 is a schematic plan view for explaining the mechanism of folding after pouring out the liquid of the contents in one embodiment of the liquid packaging bag according to the present invention. FIG. 6 is a perspective schematic view for explaining a state in the middle of folding after pouring out the liquid of the contents in one embodiment of the liquid packaging bag according to the present invention. FIG. 7 is a perspective schematic view for explaining a folded state after the liquid of the contents is poured out in one embodiment of the liquid packaging bag according to the present invention. FIG. 8 is a schematic plan view for explaining an example of folding line display in one embodiment of the liquid packaging bag according to the present invention.

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

FIG. 1 is a schematic plan view of a liquid packaging bag as seen from the front side, for explaining one embodiment of the liquid packaging bag according to the present invention.

The present invention is a liquid packaging bag (100), which comprises a laminate having a plastic film as a base material and at least a sealant layer.

In this liquid packaging bag (100), the sealant layers of the body front layered body (10) and the body rear side laminated body (20) are faced to each other to seal the peripheral portions to seal the body ( 1) is formed. In the example shown in FIG. 1, the body portion (1) is formed by sealing the left and right side end seal portions (11), the bottom seal portion (12), and the upper seal portion (13). The mouth seal portion (14) is sealed and hermetically sealed.

Further, in the example shown in FIG. 1, an example is shown in which the trunk rear stack (20) is provided with the branch (3), and the branch (3) is sealed by the branch seal part (15). It is sealed. This branch (3) will be described later.

The spout (8) is provided in a part of the peripheral portion of the body (1), but in the example shown in FIG. It is an example that has been. For example, the contents can be poured into a container such as a plastic bottle from the pouring port (8), and the packaging bag can be used as a refill container.

The pouring opening (8) can be partially cut to form an opening for pouring, for example, along the opening line (9), with fingers, or with a knife such as scissors or a knife. It is possible to cut through the laminate with.

Further, on the upper side of the body portion (1), holes (16) penetrating the front and back are provided in the seal portions (17) at the left and right ends of the upper side.

In the present invention, when the pouring of the contents is completed and the product is discarded, for example, the body portion (10) of the liquid packaging bag (100) may be sequentially folded once or more, and then reduced and fixed. It is possible.

This folding can be performed by the first folding line (31), and the folding width at this time is T2, and the folding is performed sequentially thereafter.

The hole (16) penetrating the front and back can be fixed by inserting the last corner portion of the folding line of the body (1) that is sequentially folded into the hole (16).

Further, in the liquid packaging bag according to the present invention, when the length from the lower end to the upper end of the body portion (height of the body portion) is T1, the width of the first folding is T2, and the number of foldings is N,
T1=T2×(N+1)+3 to 8 mm×N
Can be

As a result, the folding of the body part can be performed more stably and easily by inserting and fixing the last corner of the folding line into the hole (16) by folding N times, and the convenience is further enhanced.

That is, the folding width is increased by 3 mm to 8 mm along with the increase in the number of foldings because the laminated body of the body has a thickness. By taking this into consideration and giving the width of the fold, it is possible to make the insertion and fixing of the last corner of the fold line into the hole (16) more stable and easy.

As described above, according to the present invention, in a liquid packaging bag (100) having a plastic film as a base material, it is easy to pour out the liquid of the contents, and after the liquid of the contents is poured out, It is possible to provide a liquid packaging bag that can be folded and can be maintained in a folded state without requiring a separate member.

FIG. 2 is a schematic plan view of the liquid packaging bag as seen from the rear side, for explaining one embodiment of the liquid packaging bag according to the present invention.

The example shown in FIG. 2 is an example in which a branch is provided in the body rear stack. In the present invention, the branch (3) can be provided on either the body front side laminate (10) or the body rear side laminate (20) of the packaging bag.

The branch (3) is provided at the height position of the branch in the body (1) with a fold line (6) that can be folded either upward or downward of the body (1). In the branch (3), the upper body laminated body which is continuous from the upper portion of the body and the lower body laminated body which is continuous from the lower portion of the body are overlapped, and the side end portion and the tip portion are branched and sealed (15). Is formed as a seal.

In the example shown in FIG. 2, the branch (3) is in a state of being folded back toward the upper side of the packaging bag. When the branch (3) is folded back upward, information about the contents can be displayed at this portion.

Further, by providing the branch (3), when pouring out the liquid of the content, the branch (3) can be folded back below the body part (1) to secure a stable flow path for the liquid of the content. it can.

Further, a difference in length between the length L1 from the tip (18) of the branch to the folding line (6) and the length L2 from the folding line (6) to the body lower end (5) is within 10 mm. In this case, in folding the body (1), both can be overlapped and folded together, which is highly convenient.

FIG. 3 is a front view of the liquid packaging bag for explaining the state in which the branch provided on the body rear stack is folded back in one embodiment of the liquid packaging bag according to the present invention. It is a plane (partial perspective) schematic diagram.

As described above, by providing the branch (3), when pouring out the liquid of the content, the branch (3) is folded back to the lower part of the body (1) to stably secure the flow path of the liquid of the content. can do.

The spout (8) is provided in a part of the peripheral portion of the body (1), but in the example shown in FIG. 3, the spout is provided so as to project from the center of the upper side to the outside of the packaging bag, and the branch is By folding back the lower part of the body, it is possible to more stably secure and maintain the flow path of the spout for pouring.

The pouring opening (8) can be partially cut to form an opening for pouring. For example, along the opening line (9), with a finger or with a knife such as scissors or a knife. It can be used to cut through laminates.

Alternatively, by providing an easy-opening mechanism along the opening line (9), it is possible to more easily perform tearing and opening with fingers. The easy-opening mechanism can be formed by, for example, half-cutting the laminated body.

The bottom portion (2) is folded along the fold line (19) with the sealant layer on the outside between the body front laminate (10) and the body rear laminate (20) in the lower part of the body (1). A stack of bottom plates (7) can be inserted and the bottom plates (7) can be expanded and sealed with sealants sealed together.

As a result, the liquid packaging bag (100) filled with the liquid of the contents can be made self-supporting even if the body (1) is made of a soft plastic film. can do.

FIG. 4 is a schematic perspective view for explaining a state in which the liquid of the contents is poured out in one embodiment of the liquid packaging bag according to the present invention.

The packaging bag provided with the opening (28) by slitting the pouring opening (8) along the planned opening line (9) tilts the opening (28) downward, so that the content liquid (27) is discharged. Can be poured out.

At this time, the branch (3) is folded back in the direction of the arrow (26) toward the lower part of the body part (1) of the packaging bag, and is grasped by hand from above the branch (3) to hold the liquid flow of the contents. It is possible to more stably form and maintain the path (25).

Due to such effects, it is possible and preferable to use the liquid packaging bag (100) according to the present invention as a container for refilling into a bottle container or the like.

FIG. 5 is a schematic plan view for explaining the folding mechanism after the liquid of the content liquid is poured out in one embodiment of the liquid packaging bag according to the present invention. The state shown in FIG. The pouring out of the liquid of the product is completed, and the pouring port (8) is cut off at the tip. Further, the body portion (1) is emptied by the liquid of the contents being emptied and crushed flat.

In the liquid packaging bag (100) according to the present invention, the length from the bottom end (5) of the body to the upper end (4) of the body (height of the body) is T1, and the width of the first folding is T2, where N is the number of folds,
T1=T2×(N+1)+3 to 8 mm×N
Can be

In this case, the folding or folding of the body (1) or the folded portion of the body (1) and the branch (3) overlapped with each other becomes easier to insert and fix into the hole (16).

In the example shown in FIG. 5, the number of folding times N is
N=3
Is.

The folding is performed by first folding the first folding line (31) into a valley. At this time, the width of the first folding is T2.

Subsequently, the second folding line (32) is valley-folded. At this time, the width of the second folding is T3,
T3=T2+3-8 mm.
Since there is a space of 3 to 8 mm, it is possible to absorb an increase in thickness when folding the body portion or folding and folding the body portion, and there is no difficulty in folding.

Further, the third folding line (33) is valley-folded for folding. At this time, the width of the third folding is T4,
T4=T2+3-8 mm.
In this case as well, since there is a space of 3 to 8 mm, it is possible to absorb an increase in thickness when the body part is folded or folded and overlapped, and there is no difficulty in folding.

In the example shown in FIG. 5, the folding ends at this third folding. This is the above
T1=T2×(N+1)+3 to 8 mm×N
In the example, N=3.

After the third folding, the body portion (1) is fixed in the folded state by inserting the corner portions at both ends of the ridgeline of the second folding line (32) into the holes (16). It At this time, the branch (3) may be overlapped and folded on the body (1). This state will be further described with reference to FIG.

FIG. 6 is a perspective schematic view for explaining a state in the middle of folding after pouring out the liquid of the contents in one embodiment of the liquid packaging bag according to the present invention.

In this state, both ends of the ridgeline (34) of the second folding line (32) are corner portions (30), and these corner portions (30) are located on the upper side of the body (1). , The body (1) folded or inserted into the holes (16) penetrating through the front and back provided in the seal portions (17) at the left and right ends, or the body (1) branched and stacked (3). ) And can be fixed.

This hole (16) may be a triangular shape that penetrates the laminated body as shown in FIG. 1 to FIG. 5, and may penetrate the laminated body in the shape of the oblique side (29) of the triangular shape. It may be a slit.

FIG. 7 is a perspective schematic view for explaining a folded state after the liquid of the contents is poured out in one embodiment of the liquid packaging bag according to the present invention.

In this way, by inserting the ridgeline (34) of the folding line (32) into the holes (16) of the corner portions (30) at both ends, the trunk (1) and the branch (3) are folded. Fixed.
At this time, the ridgeline (35) of the folding line (33) is on the outside of the folded packaging bag.

As a result of the body part (1) being folded and fixed, the length of the ridgeline (35) from the body part upper end part (4) becomes T5, and the body part (1) of the original liquid packaging bag (100) is The length is smaller than the length T1.

even here,
T1=T2×(N+1)+3 to 8 mm×N
And
T5 is the length from the upper end portion (4) of the body portion to the folding line (33) at the third time, and therefore the portion up to N=2 is removed from T1.

That is,
T5=T1−(T2×3+3 to 8 mm×2),
T5=T2+3-8 mm
Is.

Therefore, in the example shown in FIG. 7, the length T5 is slightly more than a quarter of the length T1 of the body (1) of the original liquid packaging bag (100). ing.

Further, in the example shown in FIG. 7, the spout (8) is provided so as to protrude from the center of the upper side of the peripheral edge of the body toward the outside of the packaging bag, and the body (1) folded and fixed, It is possible to fix the spout (8) by sandwiching the opening (28) of the spout (8) in the direction of the arrow (24) in FIG. 7.

This can prevent the content liquid remaining inside the liquid packaging bag (100) from leaking out from the opening (28).

FIG. 8 is a schematic plan view for explaining an example of folding line display in one embodiment of the liquid packaging bag according to the present invention.

In the liquid packaging bag (100) according to the present invention, the folding of the body portion (1) can be made visible from the outside of the packaging bag by indicating the position for folding. For example, as in the example shown in FIG. 8, folding position indicators (36), (37), (38) can be provided so as to be visible from the outside of the packaging bag.

Visualization of the folding line may be performed not only by displaying it as a line but also by displaying it at spots on both side ends of the body (1), and the shape is arbitrary as long as it can be easily identified. Further, the display means can be displayed, for example, by printing on a layer visible from the outside of the laminate.

With this, when the body portion (1) or the body portion (1) and the branch (3) are overlapped and folded after the liquid of the contents is poured out, which part should be folded for easier fixing? Understandable and convenient.

Alternatively, the position of the folding line may be subjected to a folding guide process that allows folding to be performed more easily. For example, it can be provided as the folding guide processing (39), (40), (41) at the positions of the folding position indications (36), (37), (38) shown in FIG.

As a result, the folding work can be performed more easily and accurately, which is highly convenient. In addition, the bending process does not particularly limit the forming means, but for example, the laminated body of the body portion (1) is subjected to ruled line processing along the folding line, embossing as a folding line, etc. You may.

Further, the present invention is a liquid packaging bag (100) comprising a laminate having a plastic film as a base material and a sealant layer. The layer structure, the material structure, the thickness, and the like of the laminate can be appropriately designed according to the required quality of the packaging bag. Further, the plastic film can be laminated with another layer via an adhesive layer to form a laminate.

The plastic film is a film made of a polymer resin composition, and includes, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.). ), polyimide or the like can be used and is appropriately selected according to the application.

In particular, when polypropylene or polyethylene terephthalate is used as the plastic film, it is more preferable in terms of film strength and cost. In addition, when a stretched polyamide film is used, the laminate can be provided with toughness against puncture and impact toughness.

Further, for example, for the purpose of improving the storability of the contents, an opaque layer such as a colored film that blocks ultraviolet rays can be provided in the laminate constituting the packaging bag. Alternatively, a gas barrier layer can be provided in the laminate. For example, a gas barrier film having a gas barrier layer provided on the surface of a plastic film can be used.

Metal foil such as aluminum is also effective as a gas barrier layer, but caution is required in microwave oven cooking because sparks due to high frequency occur.

In the case of a gas barrier film, the plastic film used is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide. (Nylon-6, Nylon-66, etc.), polyimide, etc. can be used and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the plastic film substrate, it is more preferable in terms of film strength and cost.

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

As a method for forming a vapor deposition layer, an inorganic compound such as SiO or AlO can be coated on a plastic film provided with an anchor coat layer by using a vacuum vapor deposition method to form an inorganic compound layer by a vacuum vapor deposition method. ..

As a method for forming the coating layer, an aqueous solution or water/alcohol containing at least one of a water-soluble polymer and (a) one or more alkoxides or hydrolysates thereof, or both (b) tin chloride. A coating agent having a mixed aqueous solution as a main component is applied onto a film and dried by heating to form an inorganic compound layer by a coating method to form a coating layer.

The inorganic compound layer has a gas barrier property only by a coating film formed by a vacuum vapor deposition method, but a coating layer that is an inorganic compound layer formed by a coating method is formed on a vapor deposition layer that is an inorganic compound layer formed by a vacuum vapor deposition method to form a gas barrier layer. be able to.

Further, when SiO, for example, 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 may be properly used depending on the application and the required quality.

The sealant layer makes it possible to stack two laminates so that the sealant layers face each other, and heat and pressurize them to heat-seal them to bond them to each other to form a bag.

As a material of the sealant layer, a polyolefin resin is generally used among thermoplastic resins, and specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), linear low density polyethylene resin. (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, and other ethylene-based resins, blended resins of polyethylene and polybutene, and homopolypropylene resins. Polypropylene resins such as (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene-α-olefin copolymer and the like can be used.

For formation of the sealant layer, a molten resin can be formed into a film 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 a film in advance by laminating.

If necessary, for the purpose of improving the image of the product, displaying the necessary information about the contents, and improving the design, the printed layer is the layer that can be seen from the outside of the packaging bag in the laminate based on the plastic film. Can be provided. The printing layer may be provided on the outermost layer of the packaging bag.

Further, the printing layer may be provided on a part of the packaging bag or may be provided on the entire surface of the packaging bag. Alternatively, as a method of providing the display portion without using the printing layer, for example, a printed sticker may be attached to the surface of the packaging bag.

Here, there are no particular restrictions on the printing method and printing ink, but among the known printing methods, printability on plastic films, design properties such as color tone, adhesion, safety as a food container, etc. It may be appropriately selected in consideration of the above.

For example, a known printing method such as a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, a silk screen printing method, and an inkjet printing method can be selected and used. Among them, the gravure printing method can be preferably used in terms of productivity, printability on a plastic film, and high definition of a pattern.

As described above, according to the invention, in a liquid packaging bag having a plastic film as a base material, it is easy to pour out the liquid of the content, and it is foldable after the liquid of the content is poured out, and It is possible to provide a liquid packaging bag that can maintain a folded state without requiring a separate member.

DESCRIPTION OF SYMBOLS 1... Body part 2... Bottom part 3... Branch 4... Body part upper end part 5... Body part bottom end part 6... Folding line 7... Bottom plate 8... Pouring out Port 9... Scheduled opening line 10... Body front stack 11... Left and right side end seals 12... Bottom seal 13... Top seal 14... Pouring spout seal Part 15... Branch seal part 16... Hole 17... Seal part 18 on both left and right ends of upper side... Tip of branch 19... Fold line 20 of bottom plate...・・・Arrow 25 ・・・Flow path 26 ・・・Arrow 27 ・・・Content liquid 28 ・・・Opening 29 ・・・Slope 30 ・・・Corner part 31 ・・・First folding line 32 ...The second folding line 33... The third folding line 34... Ridge line 35... Ridge line 36... Folding position display 37... Folding position display 38... Folding position display 39... Bending induction processing 40... Bending induction processing 41... Folding induction processing 100... Liquid packaging bag

Claims (8)

A packaging bag for liquids,
The packaging bag comprises a laminate having at least a sealant layer using a plastic film as a base material,
The packaging bag comprises a front laminated body and a rear laminated body that form a body portion and seals a peripheral edge portion with the sealant layers facing each other, and has a pouring opening in a part of the peripheral edge portion. And
The pouring opening is capable of forming an opening by cutting a part of the laminate.
On the upper side of the body part, the left and right seal parts are provided with holes penetrating the front and back,
The packaging bag, after pouring out the liquid, the body can be folded one or more times in sequence,
The liquid packaging bag, wherein the folded and overlapped body portion can be fixed by inserting the corner portions of the folding line into the holes. In the liquid packaging bag according to claim 1, the length from the bottom end of the body to the upper end of the body (height of the body) is T1, the width of the first folding is T2, and the number of foldings is When N,
T1=T2×(N+1)+3 to 8 mm×N
A packaging bag for liquids, characterized in that: The bottom portion is formed by inserting a laminate of bottom plates folded with the sealant layer on the outer side between the laminate on the front side of the body and the laminate on the back side of the body in the lower portion of the body so that the bottom plate can be expanded. The liquid packaging bag according to claim 1 or 2, wherein the sealants are sealed with each other. A branch is provided on the front side of the body of the packaging bag and on the back side of the body,
The branch has a folding line that can be folded in either the upward or downward direction of the trunk at the height of the trunk in the trunk,
The branch is formed by stacking an upper body laminated body continuous from the upper side of the body and a lower body laminated body continuous from the lower side of the body, and sealing the side end and the tip. The packaging bag for liquid according to any one of claims 1 to 3. The liquid according to claim 4, wherein a difference between the length from the tip of the branch to the folding line and the length from the folding line to the bottom end of the body is within 10 mm. Packaging bag. The spout is provided so as to project outward from the upper side of the peripheral portion of the body, and the opening of the spout can be sandwiched and fixed to the body that is folded and fixed. The packaging bag for liquid according to any one of claims 1 to 5. The liquid packaging bag according to any one of claims 1 to 6, wherein the folding of the body portion is shown at a position for folding and is visible from the outside of the packaging bag. The packaging bag for liquid according to claim 7, wherein the folding position is subjected to a folding induction process that facilitates folding.