Patent Application
20180118440
The present invention relates to a packaging bag, more particularly, a packaging bag that can be unsealed from one side sealed part to the other side sealed part with fingers.
In recent years, packaging bags, such as retort pouches, containing contents are widely used. Many of such packaging bags are opened by tearing a portion close to the upper sealed part with one's fingers from one side sealed part to the other side sealed part. In order to facilitate unsealing, easily-openable parts such as notches and incisions are formed in the side sealed parts of many packaging bags. In addition, in the following Patent Document 1, disclosed is a soft packaging bag in which, in order to facilitate unsealing, a start-to-cut incision processing is performed in the peripheral heat-sealed part, and continuing to the start-to-cut incision processing, a continue-to-cut incision processing is performed on the non-heat-sealed part.
When unsealing a packaging bag containing viscous contents such as retort curry, it is desirable not only to tear the packaging bag from the end to the end, but also to separate the tom broken piece from the bag. If the broken piece remains without being separated, the contents adhered to the broken piece may adhere to the hands when taking out the contents. Also, when forcibly trying to tear off the remaining broken piece, the contents adhered to the broken piece may splash around accidentally.
As shown in
The present invention has been attained taking the above-mentioned circumstances into consideration, and is aimed at providing a packaging bag in which, when unsealing a packaging bag from a sealed part at an unsealing start side to a sealed part at an unsealing terminal side via an accommodation part, a broken piece can be separated easily while preventing adhered contents from scattering around.
The inventors of the present invention made various experiments and studies. As a result, they noticed that, when a packaging bag is unsealed, if the break line of the front film and the break line of the back film finally reach the same point on the inner edge of the sealed part on the unsealing terminal side, it is not necessary to peel off the front film and the back film with a large force and it is possible to tear apart the sealed part on the unsealing terminal side with a small shearing force and to easily separate the broken piece of the packaging bag.
The packaging bag of the present invention is a packaging bag that has a sealed part at an end of a front film and a back film being superimposed on each other, and is unsealed from a sealed part on an unsealing start side to a sealed part on an unsealing terminal side across an accommodation part,
an easily-openable part is provided on the sealed part on the unsealing start side, and, in the accommodation part between the sealed part on the unsealing start side and the sealed part on the unsealing terminal side, a front unsealing guide line provided on the front film and a back unsealing guide line provided on the back film are provided,
the front unsealing guide line and the back unsealing guide line extend in an inclined manner with respect to an unsealing virtual straight line linearly drawn in an unsealing direction from the easily-openable part to the sealed part on the unsealing terminal side, and
an end on the unsealing terminal side of the front unsealing guide line and an end on the back unsealing guide line of the back unsealing guide line are superimposed on each other on an inner edge or in the vicinity of the inner edge of the sealed part on the unsealing terminal side or on an lower edge or in the vicinity of the lower edge of the sealed part on an opening side.
In the packaging bag of the present invention, the unsealing guide lines are provided such that the end on the unsealing terminal side of the front unsealing guide line and the end on the unsealing terminal side of the back unsealing guide line are superimposed on the inner edge or in the vicinity of the inner edge on the unsealing terminal side, or on the lower edge or in the vicinity of the lower edge of the sealed part on the opening side. Therefore, when the packaging bag is unsealed, even if the break lines of the front film and the back film are displaced upward and downward, the break line of the front film and the break line of the back film that respectively reach the front unsealing guide line and the back unsealing guide line are guided by the front unsealing guide line and the back unsealing guide line so that they are joined in a superimposed manner on the inner edge or until they reach the inner edge of the sealed part on the unsealing terminal side.
As a result, the break line of the front film guided by the front unsealing guide line and the break line of the back film guided by the back unsealing guide line are joined, and finally arrive at the same point on the inner edge of the sealed part of the unsealing terminal side. As a result, the sealed part on the unsealing terminal side can be tom off with a small shear strength, whereby a broken piece of a packaging bag can be easily separated.
According to the packaging bag of the present invention, when unsealing the packaging bag, a broken piece can be easily separated. Furthermore, adhesion of contents to the hands from a broken piece, and scattering of contents during separation are also prevented. In addition, since it is unnecessary to use special processing such as laser processing or a special film such as a linearly-cuttable film, cost reduction can also be attained.
Hereinbelow, an embodiment of the packaging bag according to the present invention with reference to the drawings.
Various heat-sealable materials can be used for the front film 1a and the back film 1b. For example, each of the front film 1a and the back film 1b may be a single layer film made from heat-sealable thermoplastic resin or a laminated film having a heat-sealable surface formed of thermoplastic resin. Each of the front film 1a and the back film 1b may have a laminate structure in which a barrier layer such as an aluminum layer is disposed between laminated films.
In the packaging bag 1 shown in
The unsealing direction of the packaging bag 1 is in parallel with the top sealed part 6 and is orthogonal to the side sealed part 4. An inclined seal part 5 is formed as the sealed part on the unsealing terminal side positioned in the unsealing direction as viewed from the easily-openable part 10 on the unsealing start side. The inclined sealed part 5 is inclined between the top sealed part 6 and upper end of other side sealed part 4. A straight line extending from the easily-openable part 10 to the inclined sealed part 5 on the unsealing terminal side across the accommodation part 3 is an unsealing virtual straight line 12.
In the present embodiment, an inner edge of the inclined sealed part 5 on the unsealing terminal side is an inner edge inclined part 5u that crosses the unsealing virtual straight line 12 and is inclined by a prescribed angle θ relative to the unsealing virtual straight line 12.
The inner edge inclined part 5u of the inclined sealed part 5 covers at least a range S in which the break lines of the front film 1a and the back film 1b are misaligned (hereinafter referred to as the “front and back misalignment range S”).
The front and back misalignment range S varies depending on various factors such as the distance between the easily-openable part 10 and the inner edge of the top sealed part 6, the shape and dimension of the packaging bag 1, the material and thickness of a film, the magnitude and direction of the force of the fingers when breaking the packaging bag 1 and the speed of breakage. Therefore, the front and back misalignment range S is statistically set from experimental data according to a product.
Since the position of the upper limit Sa of the front and back misalignment range S is restricted by the inner end of the top sealed part 6, the upper limit Sa of the front and back misalignment range S can be raised to the upper end 5u1 of the inner edge inclined part 5u of the inclined sealed part 5.
On the other hand, the position of the lower limit Sb of the front and back misalignment range S is required to be set such that the lower limit Sb does not reach below the lower end 5u2 of the inner edge inclined part 5u of the inclined sealed part 5 (upper end of the side sealed part 4).
The front and back misalignment range S is determined by the maximum width D in the unsealing direction of the packaging bag 1. It has been confirmed that, by setting the height (gap) H from the unsealing virtual straight line 12 to the lower end 5u2 of the inner edge inclined part 5u to be 5/18 or less relative to the maximum width D in the unsealing direction of the packaging bag 1, the inner edge inclined part 5 can cover almost entirely the lower limit Sb of the front and back misalignment range S.
It is preferred that the position of the upper limit Sa of the front and back misalignment range S be set such that it does not interfere the top sealed part 6.
Subsequently, with reference to
First, the easily-openable part 10 of the side sealed part 2 as the sealed part on the unsealing start side of the packaging bag 1 is broken, whereby a first unsealing is conducted.
Then, the broken piece 1c on the side of the top sealed part 6 is turned toward the front side or the back side and is pulled in the unsealing direction toward the inclined sealed part 5, which is the sealed part on the unsealing terminal side. As a result, a shearing force is applied to the packaging bag 1 along the unsealing virtual straight line 12, the front film 1a and the back film 1b that are not heat-sealed in the accommodation part 3 are broken in a state of being superimposed, and a second opening is conducted (see
The break line 10a of the front film 1a and the break line 10b of the back film 1b progress while generating front and back misalignments in vertical direction. At the second unsealing stage, the front ends of the break lines 10a and 10b on the front and back sides simultaneously proceed.
The break line 10b of the back film 1b that is misaligned upwardly firstly arrives at the inner edge inclined part 5u of the inclined sealed part 5 of the unsealing terminal side at the arrival point Pb. Subsequently, the break line 10b progresses along the inner inclined part 5u of the inclined sealed part 5, and is joined with the break line 10a of the front film 1a that is misaligned downwardly at the arrival point Pa, whereby the broken piece 1c is separated.
If the break line 10a of the front film 1a and the break line 10b of the back film 1b are misaligned inversely in the vertical direction, similarly, the upper break line firstly arrives at the inner edge inclined part 5u and can be joined with the lower break line. Further, when the inner edge inclined part is inclined in a direction opposite to the above-mentioned inclination, that is, an upper part of the inner peripheral part is inclined towards the unsealing terminal side that is opposite to the accommodation part, the lower break line firstly arrives at the inner edge inclined part, progresses along the inner edge inclined part, and is joined with the upper break line at the arrival point of the upper break line.
This process of joining will be explained with reference to
Simultaneously with the progress of the upper break line 10b, the lower break line 10a progresses in the tensile direction of the break piece 1c, and is joined with the upper break line 10b at the arrival point Pa of the inner edge inclined part 5u of the inclined sealed part 5 of the lower break line 10a (see
Further, when the broken piece 1c is pulled, the tensile strength T and the reaction force acting on the front film 1a and the back film 1b superimposed on the side of the accommodation part 3 intensively ad at the arrival point Pa where the lower break line 10a and the upper break line 10b are joined. As a result, third opening to break the inclined sealed part 5 is conducted, whereby the broken piece 1c is completely separated (see
As mentioned above, if the break line causes front and back misalignment during a period of time from the first unsealing to the second unsealing of the packaging bag 1, in the third unsealing, the break lines are joined at one arrival point. As a result, the packaging bag 1 can be smoothly broken without need of an excessive force.
Next, an explanation will be made on a virtual opening width W along the virtual unsealing line 12 that is a gap between the side sealed part 2 on the unsealing start side and an inner edge of the inclined sealed part 5 on the unsealing terminal side and the angle θ made by the inner edge inclined part 5u of the inclined sealed part 5 and the unsealing virtual straight line 12.
Since the pouring property of contents is lowered if the width of the opening after unsealing is lowered, it is preferred that the virtual opening width W be about 35 mm or more. If the virtual opening width W is less than 35 mm, the front and back misalignment of the break lines hardly occurs. On the other hand, if the virtual opening width W is 35 mm or more, the front and back misalignment of the break lines tends to occur easily, and as a result, the effects of the inner edge inclined part of the present invention can be fully exhibited.
The angle θ made by the inner edge inclined part 5u of the inclined sealed part 5 and the unsealing virtual straight line 12 is an acute angle made by the inner edge inclined part 5u that passes the arrival point Pb at which the break line 10b arrives first and the arrival point Pa at which the break lines are joined and the unsealing virtual straight line 12 (
As mentioned above, it is required to generate a component force for breaking the packaging bag 1 from the arrival point at which one break line arrives the inner edge inclined part at first to the arrival point at which two break lines are joined, it suffices that the angle θ be basically an acute angle. The angle θ may be 60° or less, more preferably 45° or less in order to allow the component force to be a certain level or more. However, if the angle θ becomes small, the width of the opening becomes narrow, the angle θ is preferably 20° or more.
In the packaging bag of the present invention, the inner edge inclined part on the unsealing terminal side may at least be a straight line that is inclined by a prescribed angle relative to the unsealing direction or a curved line having a tangent line inclined by a prescribed angle with respect to the unsealing direction in the front and back misalignment range of the break lines of the front film and the back film, and various modifications are possible as mentioned below.
In the inclined sealed part 5 shown in
The inner edge inclined part 70u of the inclined sealed part 70 shown in
The inner edge inclined part 71u of the inclined sealed part 71 shown in
The inner edge inclined part 72u of the inclined sealed part 72 shown in
The inclined sealed part 73 shown in
The inclined sealed part 74 shown in
In the above-mentioned modification example, the inner edge inclined part has a shape that protrudes to the accommodation part 3. In the modification example that will be explained below with reference to
In the modification example shown in
The packaging bag shown in
The packaging bag shown in
The packaging bag shown in
The packaging bag shown in
The packaging beg shown in
The front film 1a and the back film 1b are each formed of a laminate film obtained by superimposing a nylon layer on a polyolefin layer, for example.
For the front film 1a and the back film 1b, various materials and configurations enabling heat sealing can be adopted. For example, the front film 1a and the back film 1b may be composed of a single layer film formed of a thermoplastic resin capable of being heat sealed, or may be formed of a laminate film of which the surface to be heat-sealed is formed of a heat-sealable resin. The laminated film may have a laminate structure in which a barrier layer is provided in the intermediate layer or a laminate structure in which a barrier layer is provided in the surface layer. In the laminate film, a resin layer may be used as a base material, or paper may be used as a base material.
In the accommodation part 3 that is an unsealed region between the pair of side sealed parts 2 and 4 of the front film 1a and the back film 1b, a front unsealing guide line 14 provided in the front film 1a and a back unsealing guide line 14 provided on the back film 1b are provided. In
The front unsealing guide line and the back unsealing guide line 14 obliquely cross the unsealing virtual straight line 12, and extend along the direction from the lower left to the upper right. The unsealing virtual straight line 12 is a virtual line along an unsealing direction in which the part 1c above the easily-openable part 10 (hereinafter referred to as “broken piece”) is pulled with fingers when unsealing is conducted from the easily-openable part 10 in the form of a notch formed on the side sealed part 2 on the unsealing start side (hereinafter also referred to as “left side sealed part”) to the side sealed part 4 on the unsealing terminal side (hereinafter referred to as the “right side sealed part”).
When the packaging bag has a rectangular shape having a pair of side sealed parts 2 and 4 that are in parallel with each other and the top sealed part 6 that extends orthogonally cross these sealed parts as in the present embodiment, as shown in
The angle θ formed by each of the front unsealing guide line 14 and the back unsealing guide line 14 and the unsealing virtual straight line 12 is preferably 10 to 50°, more preferably 20 to 45°. If the angle θ is larger than 50°, when unsealing, among the puling forces along the unsealing virtual straight line 12, the component force in the direction along the unsealing guide line 14 becomes small, and as a result, it becomes difficult to tear along the unsealing guide line 14. On the other hand, if the angle θ becomes smaller than 10°, there is a high possibility that the break line does not arrive at the unsealing guide line 14.
The end 14b (hereinafter referred to as “terminal end”) closer to the right side sealed part 4 (the unsealing terminal side) of each of the front unsealing guide line and the back unsealing guide line 14 are superimposed on the inner edge 4a of the right side sealed part 4. As a result, at the time of unsealing, the break line 10a of the front film 1a and the break line 10b of the back film 1b are directly induced to a single point on the inner edge 4a of the right side sealed part 4 by the front unsealing guide line and the back unsealing guide line 14.
The terminal end 14b is not necessarily positioned on the inner edge 4a of the right side sealed part 4 as long as it can induce the break line 10a of the front film 1a and the break line 10b of the back film 1b to a single point of the inner edge 4a of the right side sealed part 4, and it may be positioned in the vicinity of the inner edge 4a. Here, it is preferred that the terminal end 14b in the vicinity of the inner edge 4a be positioned within a distance of 10 mm or shorter from the inner edge 4a. The same can be applied to other embodiments mentioned later.
Further, the end 14a (hereinafter referred to as “start end”) closer to the left side sealed part 2 of each of the front unsealing guide line and the back unsealing guide line 14 is positioned downwardly for a predetermined distance L or longer from the unsealing virtual straight line 12. On the other hand, the end (terminal end) 14b closer to the right side part 4 of the unsealing guide line 14 is positioned upwardly for a predetermined distance L or longer from the unsealing virtual straight line 12.
Here, the prescribed distance L is set to be preferably 28% or longer, further preferably 38% or longer of the length D along the unsealing virtual straight line 12 between the inner edges 2a and 4a of the pair of side sealed parts 2 and 4 (the same can be applied to other embodiments mentioned later). This ratio of the distance relative to the length D is experimentally obtained such that it includes a range when break lines are formed when unsealing a packaging bag. By arranging the start end 14a and the terminal end 14b of each of the front unsealing guide line and the back unsealing guide line 14 at a position remote from the unsealing virtual straight line 12 for a prescribed distance L or longer, the possibility that the break line arrives at the unsealing guide line 14 at the time of unsealing can be increased.
Further, the front unsealing guide line and the back unsealing guide line 14 may be composed of a weakened part that is easily broken as compared with the front film 1a and the back film 1b. Since the break line that arrives at the weakened part at the time of unsealing progresses along the weakened part that is easier to be broken as compared with surrounding parts, the weakened part functions as the front unsealing guide line and the back unsealing guide line 14. The weakened part can be formed in each of the front film 1a and the back film 1b as a non-through half-cut processing part. The half-cut processing part can be formed by laser processing, a knife processing using a roll provided with fine blades at its surface or a punching die and polishing processing in which pressing is conducted by a roll with highly hard abrasive. An appropriate method is selected from these methods to form a linear or perforated non-through half-cut processing part.
In the present embodiment, an explanation is made on the assumption that the front unsealing guide line 14 that induces the break line 10a of the front film 1a and the back unsealing guide line 14 that induces the break line 10b of the back film 1b are formed integrally such as a heat-sealed part or that the front unsealing guide line 14 formed on the front film 1a and the back unsealing guide line 14 formed on the back film 1b are formed on a position where they are superimposed. The same can be applied to the following embodiments.
Hereinbelow, unsealing of the packaging bag of the present embodiment will be explained with reference to
When the packaging bag is unsealed from the easily-openable part 10 on the left side sealed part 2 to the right side sealed part 4, by pulling a part above the easily-openable part 10 towards the right side sealed part 4 with fingers, the left side sealed part 2 is tom from the easily-openable part 10. Then, a part above the easily-openable part 10 becomes the broken piece 1c.
When the broken piece 1c is further pulled to the right, the front film 1a and the back film 1b are opened in the accommodation part between the pair of side sealed parts 2 and 4, and the front broken line 10a and the back broken line 10b extend to the right side sealed part 4. At this time, as shown in
In the present embodiment, as shown in
Subsequently, as shown in
As shown in
When the broken piece 1c is further pulled to the right side of the figure, as shown in
Further, as shown in
In the second embodiment mentioned above, an example is shown in which the front unsealing guide line 14 that induces the front break line 10a and the back unsealing guide line 14 that induces the back break line 10b are integrated or are arranged in a superimposed manner. However, these front unsealing guide line and the back unsealing guide line 14 may be arranged separately.
An end (start end) 16a closer to the left side sealed part 2 of the front unsealing guide line 16 and an end (start end) 17a closer to the left side sealed part 2 of the back unsealing line 17 arranged at positions different from each other. On the other hand, an end (terminal end) 16b closer to the right side sealed part 4 of the front unsealing guide line 16 and an end (terminal end) 17b closer to the right side sealed part 4 of the back unsealing guide line 17 are superimposed on the point P3 on the inner edge 4a of the right side sealed part 4.
Subsequently, with reference to
At the time of unsealing, the front break line 10a and the back break line 10b extend from the left side sealed part 2 to the right side sealed part 4. As a result, the front break line 10a arrives at the point P1 on the front unsealing guide line 16, and along the front unsealing guide line 16, it progresses in a direction indicated by an arrow A1 in
The terminal end 16b of the front unsealing guide line 16 and the terminal end 17b of the back unsealing guide line 17 are arranged on the same point P3 on the inner edge 4a on the right side sealed part 4. Therefore, the front break line 10a and the back break line 10b are joined at the point P3. As a result, the right side sealed part 4 can be tom off with a small shear strength, and from the point P3, one break line 10c progresses on the right side sealed part 4, whereby a broken piece can be separated easily.
Subsequently, with reference to
As for the packaging bag of each of the following embodiments, the configuration is the same as that of the second embodiment except for the unsealing guide line. Therefore, the same constituent elements are indicated by the same numerical references, and a detailed explanation therefor is omitted. Further, in each of the following embodiments, as in the case of the second embodiment and its modification example, the unsealing guide line may be formed as a weakened part or as an edge of a reinforced part. Further, the front film and the back film may be arranged on different positions. Further, in each of the following embodiments, a preferable range of the angle formed by the unsealing guide line and the unsealing virtual straight line 12 is the same as that in the second embodiment. In each of the following embodiments, the end closer to the left side sealed part 2 of the unsealing guide line is referred to as the start end and the end closer to the right side sealed part 4 is referred to as the terminal end.
As shown in
A start end 18a of each of the front unsealing guide line and the back unsealing guide line 18 is arranged on the inner edge 2a on the left side sealed part 2. As a result, the break line that progresses below the unsealing virtual straight line 12 arrives at the unsealing guide line 18 without fail.
At the time of unsealing, the front break line and the back break line respectively arrive at the front unsealing guide line and the back unsealing guide line 18 and are joined, and then arrive at the terminal end 18b on the inner edge 4a on the right side sealed part 4. As a result in the present embodiment, the right side sealed part 4 can be tom with a small shear force, and one break line progresses from the terminal end 18b on the right side sealed part 4, whereby a broken piece can be separated easily.
Subsequently, the packaging bag of the fourth embodiment will be explained with reference to
The easily-openable part 10 of the packaging bag of the present embodiment is provided at a position closer to the top sealed part 6 as compared with one in the second embodiment.
As shown in
On the other hand, terminal ends 20b of the front unsealing guide line and the back unsealing guide line 20 are arranged in a superimposed manner on a lower edge 6a of the top sealed part 6. As a result, the break line that progresses above the unsealing virtual straight line 12 arrives at the unsealing guide line 20 without fail.
Subsequently, with reference to
At the time of unsealing, the front break line 10a and the back break line 10b extend from the left side sealed part 2 to the right side sealed part 4. As a result, in the present embodiment, the front break line 10a arrives at the point P1 on the front unsealing line 20, and progresses in a direction indicated by an arrow A1 along the front unsealing guide line 20.
Subsequently, the back break line 10b arrives at the point P2 on the back unsealing guide line 20, and is joined with the front break line 10a that progresses along the front unsealing guide line 20. The front break line 10a and the back break line 10b that are joined at the point P2 progress along the front unsealing guide line and the back unsealing guide line 20 in a direction indicated by an arrow A2. As a result, both the front break line 10a and the back break line 10b are induced by the front unsealing guide line and the back unsealing guide line 20 to the terminal end 20b of the front unsealing guide line and the back unsealing guide line 20, i.e. the point P3 on the lower edge 6a on the top sealed part 6.
Both the front break line 10a and the back break line 10b that arrive at the point P3 progress in a direction indicated by an arrow A3 along the lower edge 6a of the top sealed part 6, and arrive at the point P4 at the corner at which the lower edge 6a of the top sealed part 6 and the inner edge 4a of the right side sealed part 4. Therefore, in the present embodiment, by the front unsealing guide line and the back unsealing guide line 20, the front break line 10a and the back break line 10b are induced to the same point on the inner edge 4a on the right side sealed part 4. As a result in the present embodiment, the right side sealed part 4 can be tom with a small shear force, and one break line 10c progresses from the point P4 on the right side sealed part 4, whereby the broken piece can be separated easily.
Meanwhile, the terminal end 20b may not be necessarily positioned on the lower edge 6a of the top sealed part 6, and may be positioned in a vicinity of the lower edge 6a of the top sealed part 6, as long as both the front break line 10a and the back break line 10b progress along the lower edge 6a of the top sealed part 6, and can be substantially induced to the same point of the inner edge 4a of the right side sealed part 4. Here, it is preferred that the terminal end 20b be positioned in the vicinity of the lower edge 6a within a distance of 10 mm or shorter from the lower edge 6a. The same can be applied to other embodiments.
Subsequently, with reference to
The easy-openable part 10 of the packaging bag of the present embodiment is provided at a position closer to the top sealed part 6 as compared with one in the second embodiment.
As shown in
Start ends 22a of the front unsealing guide line and the back unsealing guide line 22 are positioned on the inner edge 2a of the left side sealed part 2. As a result, at the time of unsealing, a break line that progresses below the unsealing virtual straight line 12 arrives at the front unsealing guide line and the back unsealing guide line 22 without fail. Therefore, in this embodiment, when unsealing, the front break line and the back break line respectively arrive at the front unsealing guide line and the back unsealing back line 22 without fail.
At the time of unsealing, the front break line and the back break line respectively arrive at the front unsealing guide line and the back unsealing guide line 22 and are joined, and arrive at the terminal ends 22b that are superimposed on the lower edge 6a of the top sealed part 6. Both the front break line and the back break line that arrive at the terminal end 22b progress along the lower edge 6a of the top sealed part 6, and arrive at a corner where the lower edge 6a of the top sealed part 6 and the lower edge 4a of the right side sealed part 4 are joined. As a result, in the present embodiment, the right side sealed part 4 can be tom off with a small shear force, and one break line progresses the right side sealed part 4 from the corner, whereby the broken piece can be separated easily.
Subsequently, with reference to
In the meantime, in order to prevent leakage of the contents of the packaging bag at the time of unsealing, it is preferred that terminal ends 30b of the front unsealing guide line and the back unsealing guide line 30 be positioned at a position higher than the upper surface of the contents. In general, in a packaging bag such as a retort pouch, in many cases, in a state that the top sealed part 6 of the retort pouch with being upward, the upper surface of the contents is positioned below the unsealing guide line 12 and at a position below the unsealing virtual straight line 12 for a distance of 23% or shorter of the length D from the unsealing virtual straight line 12 along the unsealing virtual straight line 12 of the inner edges 2a and 4a of a pair of side sealed parts 2 and 4. Therefore, in the present embodiment, when the upper surface of the contents is positioned at a position remote downwardly for a predetermined distance L from the unsealing virtual straight line 12, it is preferred that the terminal ends 30b closer to the right side sealed part 4 of the front unsealing guide line and the back sealing guide line 30 be positioned at a position below the unsealing virtual straight line 12 and is remote for a distance of 23% or shorter of the length D from the unsealing virtual straight line 12.
On the other hand, the start end 30a of the unsealing guide line 30 is positioned at a position above the unsealing virtual straight line 12 and is remote for a prescribed distance L or longer. As a result, it is possible to increase the possibility that the break line that progresses above the unsealing virtual straight line 12 arrives at the unsealing guide line 30.
At the time of unsealing, the front break line and the back break line respectively arrive at the front unsealing guide line and the back unsealing guide line 30 and are joined, and arrive at the end terminals 30b that are superimposed on the inner edge 4a of the right side sealed part 4. As a result, in the present embodiment, the right side sealed part 4 can be tom off with a small shear strength, and one break line from the terminal end 30b of the front unsealing guide line and the back unsealing guide line 30 progresses on the right side sealed part 4, whereby a broken piece can be separated easily.
Subsequently, with reference to
The easy-openable part 10 of the packaging bag of the present embodiment is provided at a position closer to the top sealed part 6 as compared with one in the second embodiment.
As shown in
On the other hand, start ends 32a of the front unsealing guide line and the back unsealing guide line 32 are positioned on the lower edge 6a of the top sealed part 6. As a result, the break line that progresses above the unsealing virtual straight line 12 can arrive at the front unsealing guide line and the back unsealing guide line 32 without fail.
At the time of unsealing, the front break line and the back break line respectively arrive at the front unsealing guide line and the back unsealing guide line 32 and are joined, and arrive at the terminal end 32b on the inner edge 4a on the right side sealed part 4. As a result, in the present embodiment, the right side sealed part 4 can be tom off with a small shear strength, and one break line from the terminal end 32b at which the front unsealing guide line and the back unsealing guide line 32 are superimposed progresses on the right side sealed part 4, whereby a broken piece can be separated easily.
Subsequently, the packaging bag according to the eighth embodiment will be explained with reference to
As shown in
Start ends 34a of the front unsealing guide line and the back unsealing guide line 34 are positioned on the inner edge 2a on the left side sealed part 2. As a result, at the time of unsealing, the break line that progresses above the unsealing virtual straight line 12 can arrive at the unsealing guide line 34 without fail.
At the time of unsealing, the front break line and the back break line respectively arrive at the front unsealing guide line and the back unsealing guide line 34 and are joined, and arrive at the terminal ends 34b that are superimposed on the inner edge 4a of the right side sealed part 4. As a result, in the present embodiment, the right side sealed part 4 can be tom off with a small shear strength, and one break line from the terminal end 34b of the front unsealing guide line and the back unsealing guide line 34 progresses on the right side sealed part 4, whereby a broken piece can be separated easily.
Subsequently, the packaging bag according to the ninth embodiment will be explained with reference to
As shown in
The start end 38a of a first unsealing guide line 38 is positioned below the unsealing virtual straight line 12 for a distance of L or longer. On the other hand, the terminal end 38b of the first unsealing guide line 38 is positioned on the inner edge 4a of the right side sealed part 4 above the unsealing virtual straight line 12 for a distance of L or longer.
The second unsealing guide line 40 is branched from the point P on the first unsealing guide line 38, and arranged such that it is remote from the first unsealing guide line 38 as it approaches the left side sealed part 2. A terminal end 40b of the second unsealing guide line 40 is arranged on the point P on the first unsealing guide line 38, and a terminal end 40a of the second unsealing guide line 40 is positioned below the unsealing virtual straight line 12 for a distance of L or longer.
As mentioned above, since the second unsealing guide line 40 is provided in addition to the first unsealing guide line 38, at the time of unsealing, if one or both of the front break line and the back break line that arrive at the first unsealing guide line 38 progress across the first unsealing guide line 38, it is possible to induce the break line that arrives at the second unsealing guide line 40 to the point P on the first unsealing guide line 38, and subsequently, it is possible to induce the break line(s) to the terminal end 38b on the inner edge 4a on the right side sealed part 4 by the first unsealing guide line 38.
Subsequently, the packaging bag according to the tenth embodiment will be explained with reference to
As shown in
A terminal end 42b of the first unsealing guide line 42 and a terminal end 44b of the second unsealing guide line 44 are arranged such that they are superimposed on the inner edge 4a of the right side sealed part 4 at a position that is remote upwardly from the unsealing virtual straight line 12 for a prescribed distance L or longer. In addition, the start end 42a of the first unsealing guide line 42 and the start end 44a of the second unsealing guide line 44 are arranged at a position that is below the unsealing virtual straight line 12 for a distance of L or longer.
As mentioned above, since the second unsealing guide line 44 is provided in addition to the first unsealing guide line 42, at the time of unsealing, if one or both of the front break line and the back break line that arrive at the first unsealing guide line 42 progress across the first unsealing guide line 42, it is possible to induce the break line that arrives at the second unsealing guide line 44 to the terminal end 44b on the inner edge 4a on the right side sealed part 4.
The packaging bag of the eleventh embodiment will be explained with reference to
The unsealing guide line of the present embodiment is composed of a first unsealing guide line 46 and a second unsealing guide line 48 that are provided on each of the front film 1a and the back film 1b. The first unsealing guide line 46 and the second unsealing guide line 48 inclined oppositely relative to the unsealing virtual straight line 12 and is arranged such that they are remote from each other as they approach the left side sealed part 2.
A terminal end 46b of the first unsealing guide line 46 and a terminal end 48b of the second unsealing guide line 48 are arranged on the unsealing virtual straight line 12 on the inner edge 4a of the right side sealed part 4 in a manner that they are superimposed.
The terminal end 46b and the terminal end 48b may be arranged in a manner that they are superimposed on the inner edge 4a of the right side sealed part 4 at a position remote from the unsealing virtual straight line 12.
A start end 46a of the first unsealing guide line 46 is arranged above the unsealing virtual straight line 12 at a position remote for a prescribed distance L or longer. On the other hand, a start end 48a of the 35 second unsealing line 48 is arranged at a position below the unsealing virtual straight line 12 for a prescribed distance L or longer. As a result, it is possible to increase the possibility that the break line arrives at at least one of the first and second unsealing guide lines 46 and 48.
Subsequently, with reference to
At the time of unsealing, the front break line 10a and the back break line 10b extend from the left side sealed part 2 to the right side sealed part 4. As a result, the front break line 10a arrives at the second unsealing guide line 48 and progresses in a direction indicated by an arrow A1 along the second unsealing guide line 48, and arrives at the terminal end 48b of the second unsealing guide line 48. On the other hand, the back break line 10b arrives at the first unsealing guide line 46, progresses in a direction indicated by an arrow A2 along the first unsealing guide line 46, and arrives at the terminal end 46b of the first unsealing guide line 46.
Since both the terminal end 46b and the terminal end 48b are arranged in a superimposed manner on the point P on the inner edge 4a of the right side sealed part 4, the front break line 10a and the back break line 10b are joined at the point P. As a result, the right side sealed part 4 can be tom off with a small shear force, and one break line 10c progresses from the point P on the right side sealed part 4, whereby a broken piece can be separated easily.
With reference to
The unsealing guide line in the present embodiment is composed of the first unsealing guide line 56 provided on each of the front film 1a the back film 1b and the second unsealing guide line 54 branched from the first unsealing guide line 56. The first unsealing guide line 56 and the second unsealing guide line 54 are arranged such that they are inclined oppositely relative to the unsealing virtual straight line 12 and is remote from each other as they approach the left side sealed part 2.
The start end 56a of the first unsealing guide line 56 is arranged below the unsealing virtual straight line 12 for a prescribed distance L or longer, and the start end 54a of the second unsealing guide line 54 is arranged above the unsealing virtual straight line 12 for a prescribed distance L or longer. As a result, it is possible to increase the possibility that the break line arrives at at least one of the first unsealing guide line 56 and the second unsealing guide line 54.
On the other hand, the terminal end 56b of the first unsealing guide line 56 is arranged on the inner edge 4a of the right side sealed part 4, and the terminal end 54b of the second unsealing guide line 54 is arranged on the point P on the first unsealing guide line 56. Therefore, when unsealing, the break line that arrives at the first unsealing guide line 56 is induced to the terminal end 56b on the inner edge 4a on the right side sealed part 4. On the other hand, the break line that arrives at the second unsealing guide line 54 is induced to the terminal end 54b (i.e. the point P on the first unsealing guide line 56) and, subsequently, is induced to the terminal end 56b on the inner edge 4a on the right side sealed part 4 by the first unsealing guide line 56. As mentioned above, also in the present embodiment, both the front and back break line are induced to a single point on the inner edge 4a of the right side sealed part 4. As a result, the right side sealed part 4 can be tom by a small shear strength, and one break line progresses from the corner on the right side sealed part 4 and a broken piece can be easily separated.
Hereinabove, the embodiment of the present invention is explained. The present invention is not restricted to the above-mentioned embodiment, and various modifications are possible within the scope of the present invention. In the above-mentioned embodiment, an explanation is made on an unsealing guide line that extends linearly. The unsealing guide line is not restricted to a straight line and may be linear or curved.
In the above-mentioned embodiment, an explanation is made on a packaging bag in the form of a flat pouch of which the four sides are heat-sealed. In the present invention, the shape of the packaging bag is not limited thereto. The present invention can be applied to a standing pouch, a pouch with a gazette and a packaging bag of which the three sides of the folded film are sealed.
As for the length and the width of each of the pair of the side sealed parts, they may be the same or different. The pair of the side sealed parts may be arranged symmetrically or unsymmetrically with respect to the central line of the packaging bag. The pair of side sealed parts may be arranged in parallel or in non-parallel with each other. For example, when the pair of side sealed parts are non-parallel with each other, and the flat shape of the packaging bag is trapezoidal, the central axis of this trapezoid is a symmetrical axis line that extends longitudinally.
The packaging bag according to the present invention can be applied to various packaging bags used for drinks or pharmaceuticals in addition to packaging bags that accommodate foods such as a retort pouch.
The documents described in the specification and the specification of Japanese application(s) on the basis of which the present application claims Paris convention priority are incorporated herein by reference in its entirety.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015-083942 | Apr 2015 | JP | national |
| 2015-241780 | Dec 2015 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2016/001986 | 4/12/2016 | WO | 00 |
