JP6942574B2 - Easy-to-open liquid bag - Google Patents

Description

The present invention relates to a synthetic resin bag containing a fluid substance such as a liquid or a viscous body, and particularly to a pouch configured to be easily opened.

As this type of pouch, a pouch (packaging bag) containing liquid foods such as seasonings and dressings, viscous substances such as mustard paste, and daily necessities such as detergents, shampoos, and oils is known. Since the products contained in such packaging bags are used by ordinary people in their daily lives, they are required to be easy to handle in a series from carrying and storage to opening and disposal. At the same time, it is preferable that it is inexpensive.

Conventionally, as an inexpensive pouch that can be easily manufactured, a bag in which a synthetic resin film is folded and heat-welded on four or three sides thereof and sealed (heat-sealed) is often used. Since this type of bag can be reliably sealed, there is no risk of leakage of the contents and it is easy to handle. On the other hand, for opening, a part of the bag is cut off with scissors or a cutter, or a break guide part such as a notch is formed in advance on a part of the outer peripheral edge, and a part of the bag is formed from the break guide part. It was necessary to cut through. In the conventional synthetic resin pouch, there are some points to be improved in terms of openability, such as the need for tools such as scissors and the need to use both hands in order to open the bag in this way. In addition, there is room for improvement, such as the time and effort required for disposal, because the debris produced by cutting or tearing becomes garbage.

In view of such circumstances, Patent Document 1 proposes a pouch with improved openability. Briefly explaining the configuration, the pouring portion of the pouch using the synthetic resin film as the base film or its vicinity is defined as the easily peelable and openable sealing portion. The easily peelable openable seal portion is a portion where the pouch filled with the contents is pinched with fingers and pressed to cause peeling prior to other seal portions to open the pouch, and is a portion of the base film. It is a portion formed by sandwiching a different type of resin film between them and performing heat sealing in that state.

In addition, as a weak seal part that is preferentially peeled off by pressurizing such as crushing the bag filled with the contents, heat seal conditions such as sealing at a lower temperature, a short time, or a lower pressure than other seal parts can be applied to other seal parts. Patent Document 2 describes a configuration different from that of the above. Further, Patent Document 3 describes that a part of the sealant layer is subjected to plasma treatment (for example, corona discharge treatment) to form a leak-treated portion in which peeling is likely to occur.

Japanese Unexamined Patent Publication No. 11-227996 Japanese Patent No. 4190185 Japanese Unexamined Patent Publication No. 2014-58338

In the configuration described in Patent Document 1, the peel strength of a part of the seal portion on the outer periphery of the pouch is lowered, and that portion can be an easily peelable and openable seal portion, that is, an easy opening. However, in order to form the easy opening, it is necessary to perform heat sealing with a synthetic resin film different from the base film sandwiched in the portion. Therefore, the constituent member requires a different type of synthetic resin film, and the manufacturing process requires a step of positioning and sandwiching the different type of synthetic resin film at a position that easily becomes an opening. Therefore, in the configuration described in Patent Document 1, there is a problem that the cost increases due to the increase in the constituent members and the processing process. Such a situation is the same even in the configuration described in Patent Document 2 and the configuration described in Patent Document 3, and requires at least two heat seals having different heat seal conditions, or heat seal. Since pretreatment is required prior to the above, there is a problem that the number of processes and equipment are increased and the cost of the pouch or pouch is increased.

The present invention has been made by paying attention to the above technical problems, and an object of the present invention is to provide a pouch for an easy-to-open fluid, which is excellent in easy-opening property and can be reduced in cost.

In order to achieve the above object, in the present invention, a sealing portion having a predetermined width is provided on the outer peripheral portion of the laminated synthetic resin films having a predetermined shape, and the synthetic resin films are heat-welded to each other and sealed at the sealing portion. In the easy-to-open fluid pouch, the outside of the seal portion is not heat-welded to a part of the seal portion from the outer peripheral edge of the seal portion to a predetermined length in the width direction of the seal portion. The synthetic resin film has an outflow path formed on the peripheral edge, and has a shape protruding toward the inside of the portion surrounded by the seal portion at the inner peripheral edge portion of the seal portion and the portion corresponding to the outflow passage. A partially heat-welded opening induction welding portion is formed , at least the innermost layer of the synthetic resin film is formed by a uniaxially stretched film, and the opening induction welding portion is the inner peripheral edge of the sealing portion. and it is characterized in that you are projecting in the extending direction of the uniaxially stretched film from parts.

In the present invention, the length of protrusion from the seal portion toward the inside of the portion of the opening induction welding portion surrounded by the seal portion may be shorter than the width of the seal portion.

Alternatively, in the present invention, the length from the inwardly protruding end of the opening induction welding portion surrounded by the seal portion to the outflow path may be shorter than the width of the seal portion.

In the present invention, a part of the seal portion forms one side that partitions the portion, and the opening width of the outflow path formed in the part of the seal portion is the one side. It may be 4% or more and 40% or less of the length of the inner dimension of the part of the seal portion forming the above.

In the present invention, the opening induction welding portion may be provided at the center of the inner dimension of the part of the sealing portion forming the one side.

In the present invention, the bonding strength of the sealing portion and the opening induction welding portion is the same strength, and can be 1N / 15 mm or more and 10N / 15 mm or less.

In the present invention, the inner surfaces of the synthetic resin films that are heat-welded to each other may be formed of polyester.

According to the present invention, when a fluid such as a liquid or a viscous body is filled in a specified amount and pressed with a finger or the like in a sealed state (full-filled state), the internal pressure increases and the fluid tends to swell. Along with this, a force that peels off the synthetic resin film that constitutes the pouch acts. Such a peeling force is generated in the entire sealing portion and the opening-inducing welding portion, but the opening-inducing welding portion is pulled toward the opening-inducing welding portion because it protrudes toward the inside where the fluid is contained. Since the peeling force acts more concentratedly than other welded parts and the bonding area (welded area) at the opening induction welding part is smaller than that of other parts, the peeling at the opening induction welding part is other welding. Occurs prior to the part. The peeling of the synthetic resin films thus generated gradually reaches from the opening induction welding portion to the sealing portion. On the other hand, an outflow path is formed from the outer peripheral edge of the seal portion toward the width direction of the seal portion, and the end portion thereof approaches the opening induction welding portion. Therefore, when the peeling started from the opening induction welding portion reaches the end of the outflow passage, the pouch is substantially opened and the fluid inside is discharged from the outflow passage to the outside. At that time, since the other parts of the seal portion are in a welded state and closed, pouring from an unintended part other than the outflow passage does not occur. Further, since the internal pressure is reduced by opening the package, the peeling of the synthetic resin films does not proceed any further.

From the above, according to the pouch of the present invention, the package can be easily opened with one hand without using tools such as scissors, and it is possible to prevent the fingers or hands from getting dirty. Furthermore, since the pouch can be opened without cutting off a part of the pouch, inconveniences such as generation of new dust and accidental ingestion of debris can be avoided or suppressed.

Further, in the present invention, the opening width of the outflow passage is set to 4% or more and 40% or less of the inner dimension length of the seal portion as the side on which the outflow passage is provided. The outflow can be performed quickly and surely, and the outflow direction can be avoided or suppressed.

In the present invention, since the sealing strength and the opening induction welding portion have the same bonding strength due to welding, the sealing portion and the opening induction welding portion can be welded at the same time under the same conditions. Compared with the case where a part of the seal portion is made into a weak seal portion having a weak adhesive strength, it is possible to provide a pouch having excellent easy-opening property at a low cost because there is no additional member or additional process. Moreover, since the joint strength is set to 1 N / 15 mm or more and 10 N / 15 mm or less, the package can be easily opened by pressing with a finger.

In particular, in the present invention, the bonding strength can be set to the above strength by using polyester (particularly polyester having a low melting point), and the content is excellent in non-adsorption property, so that it is excellent in fragrance retention, and further, oxygen gas permeation. Due to the low degree, the expiration date of the contents can be extended.

According to the present invention, since the protruding direction of the opening induction welding portion coincides with the stretching direction of the uniaxially stretched film, the force of peeling the films from each other due to the increase in internal pressure is surely applied to the opening induction welding portion. As a result, the peeling of the films can proceed from the opening induction welding portion.

It is a perspective view which shows an example of the pouch which concerns on this invention. It is a schematic diagram for demonstrating the process of making the pouch. It is a schematic diagram which shows the state at the time of opening by pressing with a finger. It is a partial view for demonstrating the state which a synthetic resin film is peeled off by an internal pressure. It is a partial view for demonstrating the state which the peeling occurs from the opening induction welding part. It is a partial view which shows a part of the comparative example which formed the opening induction welding part in the corner part.

FIG. 1 shows an embodiment of the present invention. The pouch 1 shown here is a bag made of synthetic resin that contains a sauce for soy sauce or natto, or a liquid or fluid substance such as dressing or mayonnaise, and its content is up to about 30 grams. It is a bag to be filled. The contents are filled (full injection) without gaps, and the inside is filled with liquid or fluid. Therefore, its size is such that it can be held with one hand, pinched with its fingers and crushed.

The pouch 1 is made of a synthetic resin film as a material, and the synthetic resin film is a polyester film, which may be either a single layer or a multilayer. In the case of a multilayer film, at least the innermost layer is a polyester film. More specifically, copolymerized polyester, polyester with a functional group, unoriented polyester, polyester with additives, a blend of polyester and other resins, and a low melting point resin coated on a polyester film. Is suitable. By using these polyesters at least in the innermost layer, welding at a low melting point becomes possible, and by combining with appropriate setting of conditions for heat welding (heat sealing), the desired bonding strength can be obtained. Can be done. As the synthetic resin film, it is also possible to use a film in which polyethylene and polypropylene used for easy peel and the like are blended.

Further, when a multilayer film is used, the resin used for the outer layer or the intermediate layer is not particularly limited, and for example, nylon, polyethylene, polypropylene, polyester and the like are suitable. When high barrier properties are required depending on the contents, ethylene vinyl alcohol copolymer, vinylidene chloride, MX nylon or other resin may be used for the outer layer or intermediate layer, or metal foil such as aluminum foil or aluminum vapor deposition may be used. , A film subjected to ceramic vapor deposition or the like can be used.

The pouch 1 shown in FIG. 1 is a bag sealed by stacking the above synthetic resin films and welding them with a sealing portion 2 having a closed contour shape. It is natural that the complete sealing is performed after the contents are filled. The shape of the synthetic resin film to be used (that is, the shape of the pouch 1) and the contour shape of the sealing portion 2 may be appropriately determined according to design requirements, and may be, for example, rectangular or rectangular as shown in FIG. In addition to this, geometric shapes such as polygons, circles, and stars, and shapes that imitate animals and plants can be adopted. If it is a quadrangle, the manufacturability is good.

Although two synthetic resin films may be laminated, it is preferable to fold and stack one synthetic resin film, thereby shortening the length of the sealing portion 2. Therefore, in the example shown in FIG. 1, the right side portion in FIG. 1 is a folded side 3 generated by folding, and the other upper side portion 4, the left side portion 5, and the lower side portion 6 are the seal portions 2.

Of the seal portions 2, the upper side portion 4 in FIG. 1 is formed with an opening induction welding portion 7 and an outflow passage 8 that are easily opened or preferentially opened. The opening induction welding portion 7 is a welding portion protruding from the sealing portion 2 toward the inside of the pouch 1 (a portion closed by the sealing portion 2 and the folded side 3). Further, the outflow path 8 is a portion of the seal portion 2 that has not been partially welded, and is located at a position corresponding to the opening induction welding portion 7 of the upper side portion 4 from the outer peripheral edge of the seal portion 2. It is formed over a predetermined length along the width direction of 2. In the example shown in FIG. 1, the outflow path 8 has a rectangular shape because it is not welded to the rectangular shape.

The shape of the opening induction welding portion 7 may be a shape that protrudes from the inner peripheral edge of the sealing portion 2 to the inside of the pouch 1, and may be a triangular shape as shown in FIG. , Polygonal shape, semicircular shape, semi-elliptical shape and the like. In addition, in order to cause preferential peeling of the opening induction welding portion 7, it is considered preferable that the opening induction welding portion 7 has a shape having corners such as a triangle. Further, the protruding length L of the opening induction welding portion 7 is set to be equal to or less than the width W of the sealing portion 2 (upper side portion 4). The "protruding length L" may be the length from the tip (protruding end) of the opening induction welding portion 7 to the inner peripheral edge of the sealing portion 2, or the tip (protruding) of the opening induction welding portion 7. It may be the length from the end) to the above-mentioned outflow passage 8. Then, the opening induction welding portion 7 is heat welded at the same time under the same conditions as the sealing portion 2. In other words, the opening induction welding portion 7 is a portion formed as a part of the sealing portion 2 so as to project inward as described above. The location of the opening induction welding portion 7 is preferably the central portion of the inner dimension of the upper side portion 4. This is because, for example, when the central portion of the liquid of the pouch 1 is pushed with a finger to open it, the opening induction welding portion 7 protruding inward is located in the center of the inner dimension of the upper side portion 4, so that the opening is opened from the pressed portion. This is because the induced welding portion 7 is the closest portion, and as a result, the peeling force acts more concentratedly than the other welding portions. The inner dimension is _{a portion indicated by the reference numeral "L 4} " in FIG. 1, which is a portion obtained by subtracting the width of the seal portion 2 of the left side portion 5 from the entire width of the pouch 1.

A uniaxially stretched film can be used as the material of the innermost layer of the pouch 1, and the projecting direction of the opening induction welding portion 7 from the seal portion 2 is preferably the stretching direction of the uniaxially stretched film. .. This is because the polymer chains tend to be linearly oriented in the stretching direction because the film is stretched in only one direction, so that the uniaxially stretched film is easily peeled off in the stretching direction. On the contrary, in the peeling from the direction orthogonal to the stretching direction, since the polymer chains are connected in the lateral direction with respect to the peeling direction, they become like a wall and it becomes difficult to peel. Normally, the uniaxially stretched film is stretched in the machine direction (MD) direction, which is the flow direction of the film, but the uniaxially stretched film is stretched in the transverse direction (TD) direction, which is the width direction orthogonal to the flow direction of the film. In the case of a uniaxially stretched film, the opening induction welding portion 7 is preferably in the TD direction, which is the stretching direction.

The joint strength (heat seal strength) of the seal portion 2 and the opening induction welding portion 7 is the same strength, and is 1N / 15 mm or more and 10N / 15 mm or less. Here, the bonding strength (heat seal strength) is the strength obtained by a peeling test similar to the conventionally known T-type peeling test (T peel test), and the synthetic resin film to be tested is heat-welded with a width of 15 mm. Then, the ends of the films are pulled in opposite directions to cause peeling, the peeling speed is set to a constant speed of 100 mm / min or 200 mm / min, and the peeling force in that case is used as the bonding strength. In the present invention, if the bonding strength is less than 1N / 15 mm, there is a risk that the contents may leak due to peeling during handling such as full injection of the contents and transporting the pouch 1. On the other hand, if the joint strength exceeds 10 N / 15 mm, peeling does not occur sufficiently by pinching with a finger and applying pressure, and it becomes difficult to open the package.

On the other hand, the outflow passage 8 is a flow path for flowing out the contents, and is opened at the outer peripheral edge of the seal portion 2, and the width (opening width) W ₈ thereof is appropriately determined according to the fluidity of the contents. Is set to. For example, if the content has an extremely low viscosity such as water, the width W ₈ of the outflow passage 8 described above is 4% or more _{of the inner dimension length L 4} of the upper side 4 where the outflow passage 8 is located. It is 40% or less. For example _{, when the length of L 4} is 35 mm, it is 1.4 mm or more and 14 mm or less. If it is less than 4% (1.4 mm), it becomes difficult to allow the contents to flow out smoothly or quickly. Further, if it exceeds 40% (14 mm), there is a high possibility that the outflow direction of the contents will be difficult to determine. The length of the outflow path 8 is preferably the same as the seal width W, but is preferably at least half or more of the seal width W.

Here, the procedure for producing the above-mentioned pouch 1 will be briefly described. First, a synthetic resin film 10 having a width twice the width of the pouch 1 is prepared ((a) in FIG. 2). In the example shown here, the synthetic resin film 10 is the above-mentioned uniaxially stretched polyester film, which is a long film continuous in the vertical direction of FIG. 2 (a), and is the upper and lower films of FIG. 2 (a). The direction (longitudinal direction) is the extended MD direction. While feeding out the roll-wound synthetic resin film 10, it is folded in half at the central portion in the width direction ((b) of FIG. 2). Then, the side edge portions 11 overlapped with each other are heat-welded in the longitudinal direction with a predetermined width W to form the seal portion 2 corresponding to the left side portion 5 described above, and at the same time, the width is spaced at a certain interval in the longitudinal direction. Heat welding is performed in the direction with a width twice the predetermined width W to form a seal portion 2 corresponding to the above-mentioned lower side portion 6 and upper side portion 4 ((c) in FIG. 2). Here, the seal portion 2 between the lower side portion 6 and the upper side portion 4 is a portion that separates a portion where the contents are already filled and a portion where the contents are next filled, and is welded along the width direction. The lower half of the portion to be filled becomes the upper side portion 4 of the portion already filled with the contents, and the upper half becomes the lower side portion 6 of the portion to be filled with the contents next.

The shape of the heat-welded portion of the upper side portion 4 is a linear portion along the upper side portion 4, a portion of the outflow passage 8 which is a non-welded portion at the center of the inner dimension thereof, and a non-welded portion (outflow passage). It is a shape having a portion corresponding to the opening induction welding portion 7 protruding inside the pouch 1 at a portion corresponding to 8). Then, the linear portion excluding the non-welded portion serving as the outflow passage 8, the portion corresponding to the opening induction welding portion 7, and the portion corresponding to the lower side portion 6 are collectively set under conditions such as a predetermined temperature and time. (Simultaneously) heat welded. Therefore, in the pouch 1 according to the present invention, the opening induction welding portion 7 and the outflow passage 8, which are so-called easy-opening portions that are preferentially opened, are subjected to heat welding of the sealing portion 2 in the heat welding step for sealing or sealing. Formed at the same time. That is, the opening induction welding portion 7 and the outflow path 8 are formed without requiring any additional member or additional step. That is, the cost of the pouch 1 is reduced.

The portion shown by the broken line in FIG. 2C is the cutting (separation) portion that separates the sachets 1. One end of the outflow passage 8, which is a non-welded portion, coincides with or intersects the cut portion, and is opened to the outside of the pouch 1 by cutting. In the present invention, the lower half partitioned by the cut portion shown by the broken line in FIG. 2C is the lower side portion 6 of the portion already filled with the contents, and the upper half is next filled with the contents. It may be the upper side portion 4 of the portion to be formed.

The synthetic resin film 10 in which the upper side portion 4 and the lower side portion 6 are welded as described above is continuous above (c) in FIG. 2, and the left side portion 5 is welded over a length of about one pouch 1. The part beyond that is in a non-welded state and is open. A specified amount of the content is injected into the bag-shaped synthetic resin film 10 which is open upward from an appropriate filling nozzle P inserted into the opening portion. After that, the synthetic resin film 10 is carried down to the lower side of FIG. 2 (c) by the length of one pouch 1 (that is, one pitch), and in that state, the portion corresponding to the upper side portion 4 and the lower side portion 6 and the left side. The portion corresponding to the portion 5 is welded. That is, the part filled with the contents is sealed. Then, the synthetic resin film 10 is cut at the portion shown by the broken line in FIG. 2 (c), and the portion where the filling of the contents is completed is separated into individual sachets 1 ((d) in FIG. 2).

When the pouch 1 according to the present invention is opened and the contents are poured out, for example, as shown in FIG. 3, the thumb 13 and the index finger 14 hold the pouch 1 filled with the contents by sandwiching the central portion thereof. In that state, squeeze the pouch 1 with your finger. Since the content is a fluid such as a liquid or a viscous substance and is filled in the pouch 1, the internal pressure is increased by crushing the pouch 1 with two fingers. In other words, the contents are pushed toward the seal portion 2 side and the folded side 3 side, and the pressure increases. As a result, the sealing portion 2 and the opening induction welding portion 7 continuously formed therein have an action of peeling the welded synthetic resin film 10 as schematically shown in FIG.

At the tip of the opening induction welding portion 7, the length of the portion where the peeling force due to the increase in internal pressure acts, more specifically, the length in the stretched MD direction is short. Therefore, for example, as schematically shown in FIG. 5, peeling begins at the tip of the opening induction welding portion 7. In that case, since the MD direction is the direction in which the peeling of the opening induction welding portion 7 proceeds, the force of peeling the synthetic resin films 10 from each other due to the increase of the internal pressure surely acts on the opening induction welding portion 7 as the peeling force. do.

As described above, since the outflow passage 8 is formed at the position corresponding to the opening induction welding portion 7, the above-mentioned peeling of the synthetic resin film 10 extends to the outflow passage 8, so that the inside of the pouch 1 becomes the outflow passage. The pouch 1 is opened by communicating with the outside through 8. As described above, since the length L from the end of the outflow path 8 to the tip of the opening induction welding portion 7 is shorter than the width W of the seal portion 2, before any part of the seal portion 2 is opened. , The peeling of the synthetic resin film 10 extends to the outflow path 8. When the pouch 1 is opened in this way, the internal pressure is lowered, so that the peeling of the synthetic resin film 10 does not proceed any further, and therefore the pouch 1 is opened only by the outflow passage 8.

The contents flow out of the open outflow channel 8. In that case, since the opening width W ₈ of the outlet channel 8 is set to the dimensions described above, contents are quickly dispensed. Further, since the opening width W ₈ of the outflow path 8 is not particularly wide, it is possible to avoid a situation in which the outflow path 8 is poured out substantially linearly along the direction of the outflow path 8 and spreads in an unintended direction. Further, since the pouch 1 is opened by peeling at a part of the welded portion and the peeled portion extending to the outflow passage 8, there is no waste such as a cut piece or a cut piece to be discarded. As described above, the package can be opened by pinching it with a finger and pushing it, so that an instrument such as scissors is not required and a situation such as soiling the hand or finger can be avoided. The easiest way to open the package is to press the flat surface of the liquid pouch filled with the contents from above and below with your fingers, but for weak people such as children and the elderly, you can crush it from the side to the left and right. , The opening induction welding portion 7 can be opened by applying pressure by folding it in half to the left or right, folding it in half vertically, folding it in half diagonally, or the like.

Next, Examples and Comparative Examples performed to confirm the effect of the present invention will be shown.

(Example)
The synthetic resin film as a material has the following constitution. Unitika's nylon film "Emblem" (registered trademark) (thickness 15 μm) is used as the base film, and Daiwa Seikan Co., Ltd.'s uniaxially stretched PET film "Daiwa Belfine" (registered trademark) is used as the innermost sealant film. (Thickness 12 μm) was used, and these films were bonded by dry laminating using a urethane-based adhesive. Yamato Belfine is a film uniaxially stretched in the MD direction. This multilayer film was folded in half so that the PET film was on the inside, and laminated in a rectangular shape with a length of 55 mm and a width of 45 mm so that the MD direction was vertical. As shown in FIG. 2D described above, the left side portion 5 and the upper side portion 4 are heat-welded (heat-sealed), and at the same time, the opening induction welding portion (easy-opening portion) is located at the center of the inner dimension on the upper side portion 4 side. ) 7 and the outflow channel 8 were formed. The width W of the seal portion 2 was 10 mm, and the shape of the opening induction welding portion 7 was triangular. Further, the length of the outflow path 8 is 10 mm, and the opening width W _{8 is 4 mm. This is because the length of the inner dimension L 4} of the seal portion 2 on the upper side portion 4 side is 35 mm, so that the inner dimension of the seal portion 2 is 35 mm. the L ₄ is about 11% of the length. Further, the protruding length L of the opening induction welding portion 7 is set to 5 mm toward the inside of the pouch 1, and therefore is set to half the width W of the sealing portion 2.
About 5 g of tap water was put into the pouch 1 thus prepared, and the lower side portion 6 was heat-sealed with a width of 10 mm so as not to allow air to enter the pouch 1 to prepare a full-filled liquid pouch.

(Comparative Example 1)
The protruding length L of the opening induction welding portion 7 was set to 12 mm, which was longer than the width W of the sealing portion 2, and other than that, the same configuration as in the above embodiment was used.

(Comparative Example 2)
The opening width W ₈ of the outlet channel 8 and 1 mm (2.9% of the inner dimension L ₄ of the sealing portion 2), and the other structure was the same structure as the above embodiment.

(Comparative Example 3)
The opening width W ₈ of the outlet channel 8 and 15 mm (43% of the inner dimension L ₄ of the sealing portion 2), and the other structure was the same structure as the above embodiment.

(Comparative Example 4)
The seal strength (bonding strength) was set to less than 1N / 15 mm, and the other configurations were the same as those in the above embodiment.

(Comparative Example 5)
The seal strength (bonding strength) was set to a strength exceeding 10 N / 15 mm, and the other configurations were the same as those in the above-described embodiment.

(Comparative Example 6)
The opening induction welding portion (easy opening portion) 7'is formed not at the center of the inner dimension of the upper side portion 4 but at the corner portion between the upper side portion 4 and the folded side 3, and the outflow path 8'is formed at the folded side 3 accordingly. Formed alongside. The shape is schematically shown in FIG. Other configurations were the same as those in the above embodiment.

(Comparative Example 7)
The protruding direction of the opening induction welding portion 7 was directed to the unstretched TD direction (the direction orthogonal to the stretched MD direction), and other configurations were the same as those in the above-described embodiment.

(Comparative Example 8)
All of the sealing portions 2 were heat-sealed with a width of 10 mm without providing the opening induction welding portion 7 and the outflow passage 8 described above, and the other configurations were the same as those in the above-described embodiment.

(Comparative Example 9)
The film composition (nylon / polyethylene) normally used in conventional full-filled liquid sachets was used. Specifically, linear low-density polyethylene LL-MTNST (thickness 40 μm) manufactured by Futamura Chemical Co., Ltd. was used for the innermost layer film, and other configurations were the same as those in the above-mentioned Examples.

(Evaluation method)
The liquid sachets of Examples and Comparative Examples were evaluated by the following methods.
In the easy-to-open test, the central part of the liquid pouch is pressed with the thumb and index finger of one hand, and the one that does not open is "x", and the one that requires a force that is generally considered to be strong even if it is opened. "△" and "○" for those opened without the need for strong force. The number of samples was 10 each. The opening location and opening status when the easy-opening test was performed were visually observed. The seal strength test was measured based on JIS Z 0238. The number of samples was 10 each. The results are summarized in Table 1.

As the above results show, the pouch according to the present invention could be easily opened with the fingers of one hand, and the contents could be quickly poured out in the intended direction.

On the other hand, in Comparative Example 1, even if the package is opened, a strong force is required, and there is also injection from an unintended part, which is impossible in this respect. Further, in Comparative Example 2, although the package is easily opened, the content to be dispensed becomes a thin flow, and it takes a long time to dispense the required amount, which is not possible in this respect. In Comparative Example 3, since the opening width W ₈ of the outflow path 8 is too wide, the contents are ejected diagonally with respect to the extension line of the outflow path 8, and the contents frequently leak to an unintended location. It is impossible. In Comparative Example 4, the joint strength of the seal portion is too low, and while the seal portion can be easily opened, there is a risk that the bag may break and the contents may leak during handling such as during transportation, which is not possible. In Comparative Example 5, the sealing strength is too high to open the package, which is not possible. In Comparative Example 6, the opening-inducing welding portion 7'was opened at an unintended location without peeling, which is not possible. In Comparative Example 7, peeling and associated opening occur at the inner peripheral edge portion of the seal portion orthogonal to the MD direction, and even if the opening induction welding portion 7 and the outflow passage 8 are provided, the seal portion is not opened. , It is impossible in this respect. In Comparative Example 8, although the package is easily opened, the opening location is random because there is no opening induction welding portion 7, which is not possible in this respect. In Comparative Example 9, since the package is not opened, this is not possible. After all, only the pouch in the embodiment can be easily opened and the contents can be quickly poured out, and the pouring direction is the extension direction of the outflow passage 8 and becomes the intended direction, so that the intended purpose can be achieved. It became a thing.

Although the present invention has been specifically described above, the present invention is not limited to the above-described embodiment or embodiment, and among the configurations described in the embodiment or embodiment, the scope of claims of the present invention. The configurations not limited in the above may be arbitrarily changed, and the pouch containing the modified configurations also belongs to the technical scope of the present invention.

1 ... Pouch, 2 ... Seal part, 3 ... Folded side, 4 ... Upper side, 5 ... Left side, 6 ... Lower side, 7 ... Opening induction welding part, 8 ... Outflow path, 10 ... Synthetic resin film, 11 ... Side Edge, 13 ... thumb, 14 ... index finger.

Claims (7)

In an easy-to-open fluid pouch in which a seal portion having a predetermined width is provided on the outer peripheral portion of the laminated synthetic resin films having a predetermined shape, and the synthetic resin films are heat-welded to each other and sealed at the seal portion.
An outflow path opened to the outer peripheral edge of the seal portion is formed in a part of the seal portion without heat welding from the outer peripheral edge of the seal portion to a predetermined length in the width direction of the seal portion.
Opening induction in which the synthetic resin film is partially heat-welded to the inner peripheral edge of the seal portion and the portion corresponding to the outflow path so as to project toward the inside of the portion surrounded by the seal portion. A welded part is formed ,
At least the innermost layer of the synthetic resin film is formed by a uniaxially stretched film.
The opening induction welding portion protrudes from the inner peripheral edge portion of the sealing portion in the stretching direction of the uniaxially stretched film.
Easy-to-open flow animal sachet, wherein a call.
In the easy-to-open fluid pouch according to claim 1,
A pouch for an easy-to-open fluid, characterized in that the length of protrusion from the seal portion toward the inside of the portion of the opening induction welding portion surrounded by the seal portion is shorter than the width of the seal portion.
In the easy-to-open fluid pouch according to claim 1,
A pouch for an easy-to-open fluid, characterized in that the length from the protruding end of the opening-inducing welding portion to the inside of the portion surrounded by the sealing portion to the outflow path is shorter than the width of the sealing portion.
In the easy-to-open fluid pouch according to any one of claims 1 to 3,
A part of the seal portion forms one side that partitions the portion.
The opening width of the outflow path formed in a part of the seal portion shall be 4% or more and 40% or less of the length of the inner dimension of the part of the seal portion forming one side. A pouch for easy-to-open fluids.
In the easy-to-open fluid pouch according to any one of claims 1 to 4,
A pouch for an easy-to-open fluid, wherein the opening-inducing welding portion is provided at the center of the inner dimension of the part of the sealing portion forming one side.
In the easy-to-open fluid pouch according to any one of claims 1 to 5,
A pouch for an easy-to-open fluid, wherein the sealing strength and the opening induction welding portion have the same joint strength, and are 1N / 15 mm or more and 10N / 15 mm or less.
In the easy-to-open fluid pouch according to any one of claims 1 to 6,
An easy-to-open fluid pouch, wherein the inner surfaces of the synthetic resin films that are heat-welded to each other are made of polyester.

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