JP6848201B2 - Packaging container - Google Patents

Description

The present invention relates to a spout plug and a packaging container using the spout plug.

A sheet material in which a barrier layer such as an aluminum foil, an aluminum vapor-deposited film, or an inorganic oxide vapor-deposited film is laminated between a paper base material layer and a sealant layer made of a thermoplastic resin is bent into a box shape. A packaging container formed by overlapping and sealing the ends is known (Patent Document 1).

There are various forms of such a packaging container, and one of them is to provide a cap and a spout plug made of polyethylene or the like on a gable top type (gable roof type) roof plate to pour the content liquid. Packaging containers that allow delivery are known. In the case of such a packaging container, it is preferable to separate the container body made of a paper sheet material and the spout / outlet plug welded to the container body for separate collection at the time of disposal. As a separation method, there is a method of opening the top seal portion and cutting the sheet material around the spout plug with scissors or the like. However, such a packaging container is usually not easy to disassemble because the top seal portion is strongly fused, and the spout plug is often not separated from the packaging container.

Patent Document 2 discloses a paper package in which a spout plug having an annular thin wall formed on the inner peripheral upper surface of the annular body (flange portion) is attached to a paper container having a bending guide line. According to this paper package, by bending the paper package along the bending guide line, the annular thin-walled portion is broken, and the tubular body of the spout / outlet plug can be separated from the paper container.

Japanese Unexamined Patent Publication No. 2003-335362 Japanese Unexamined Patent Publication No. 2011-073748

However, when an annular thin-walled portion is formed on the spout plug as in Patent Document 2, the rigidity of the flange portion of the spout plug is reduced. Therefore, when welding to a paper container, the shape of the flange portion is not stable and uneven welding may occur, which may cause liquid leakage. Further, if welding is performed with high energy to prevent this, there is a risk that the spout plug may be damaged from the thin portion due to ultrasonic vibration.

The present invention has been made in view of such a problem, has sufficient rigidity, is not damaged by ultrasonic vibration during welding, and can be easily separated when disassembling the packaging container. It is an object of the present invention to provide a stopper and a packaging container using the stopper.

One aspect of the present invention for solving the above problems is to extend outward from the container body provided with the injection hole, the cylindrical side wall having the outer screw formed on the outer peripheral surface, and the lower end edge of the side wall. The container has a disc-shaped flange provided, a side wall is inserted into the pouring hole, a spout with the flange attached to the container body, and a spout plug including a cap screwed into the spout. In the main body, a fragile portion with weakened breaking strength is formed along a straight line passing through the center of the injection hole in the width direction, and is formed on the entire circumference in the width direction of the container body . This is a packaging container in which a groove-shaped first meat stealing portion is formed on the inner peripheral surface of the side wall in a region on the lower end side of the external screw and on the upper end side of the flange portion.

According to the present invention, there is provided a spout plug that has sufficient rigidity, is not damaged by ultrasonic vibration during welding, and can be easily separated when disassembling the packaging container, and a packaging container using the same. can do.

Perspective view of the packaging container according to the first embodiment of the present invention. Cross-sectional view of the spout plug according to each embodiment of the present invention Top view of the spout plug according to each embodiment of the present invention Top view of the blank according to the first embodiment of the present invention. The figure which shows an example of the separation method of the spout plug which concerns on 1st Embodiment of this invention. The figure which shows an example of the separation method of the spout plug which concerns on 1st Embodiment of this invention. The figure which shows an example of the separation method of the spout plug which concerns on 1st Embodiment of this invention. The figure which shows an example of the separation method of the spout plug which concerns on 1st Embodiment of this invention. Perspective view of the packaging container according to the second embodiment of the present invention. Top view of the blank according to the second embodiment of the present invention. The figure which shows an example of the separation method of the spout plug according to the 2nd Embodiment of this invention. The figure which shows an example of the separation method of the spout plug according to the 2nd Embodiment of this invention. The figure which shows an example of the separation method of the spout plug according to the 2nd Embodiment of this invention.

The packaging container and the spout plug according to the embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same or corresponding configurations are designated by the same reference numerals and the description thereof will be omitted.

<First Embodiment>
(Packaging container)
FIG. 1 shows a perspective view of the packaging container 1 according to the first embodiment. The packaging container 1 includes a container body 100 formed by bending a blank 110 processed from a sheet material into a box shape, overlapping the ends thereof, and sealing the blank 110, and a spout plug 2. The spout plug 2 includes a spout 3 and a cap 4. As an example, the container body 100 includes a top portion 101 which is an upper portion when standing upright, a body portion 102 which is a side surface, and a bottom portion 103 which is a lower portion, and the top portion 101 includes two roof plates 106 (106a, 106b). Includes a folding plate 107 and a folding plate 108 that are folded between the roof plates 106. A circular injection hole 114 is formed in the roof plate 106a. The spout plug 2 is attached to the spout hole 114. On the four side plates 111 forming the body 102, as an example, a fragile portion 105 having weakened breaking strength goes around the body 102 in the width direction, which is the left-right direction when the container body 100 is upright. Is formed to do.

(Outlet plug)
FIG. 2A shows a cross-sectional view including an enlarged view of the spout plug 2 including the spout 3 and the cap 4 according to the first embodiment, and FIG. 2B shows a plan view of the spout 3 as viewed from below. In the description of the spout plug 2, for convenience, the vertical direction of the paper surface in FIG. 2A is defined as vertical. Further, FIG. 2A is a cross section of the spout plug 2 cut along the AA'line shown in FIG. 2B.

The spout 3 extends outward from the cylindrical side wall portion 11, the cylindrical pedestal portion 12 having a larger outer diameter than the side wall portion 11 provided at the lower end of the side wall portion 11, and the lower end edge of the pedestal portion 12. It is provided with a disk-shaped flange portion 13 provided. As an example, the spout 3 is attached by ultrasonically welding the surface of the flange portion 13 on the side wall portion 11 side to the inner surface of the roof plate 106a of the container body 100.

On the outer peripheral surface of the side wall portion 11, an external screw 14 screwing with the internal screw 23 of the cap 4 is provided from the upper end side. A convex portion 15 protruding in the circumferential direction may be provided in a region on the lower end side of the external screw 14 and on the upper end side of the pedestal portion 12. On the inner peripheral surface of the side wall portion 11, a disk-shaped partition wall 17 that closes the upper end side and the lower end side is provided via a half cut 18 formed by reducing the thickness of the outer peripheral edge of the partition wall 17. As shown in FIG. 2A, the half cut 18 may be formed by providing a recess only on the upper surface of the partition wall 17 in consideration of the ease of removing the mold during molding, or the half cut 18 may be formed by providing a recess on the upper and lower surfaces of the partition wall 17. May be provided and formed. The partition wall 17 is provided with a pull ring 20 via a support column 19.

A groove-shaped first meat stealing portion 16 is formed on the inner peripheral surface of the side wall 11 in a region on the lower end side of the external screw 14 and on the upper end side of the flange portion 13. Further, a groove-shaped second meat stealing portion 24 is formed on the lower end surface of the pedestal portion 12 over the entire circumference of the lower end surface. The first meat stealing portion 16 is formed so that at least a part thereof is located above the pedestal portion 12. The groove width of the first meat stealing portion 16 may be constant, or the groove width may be widened inward as shown in FIG. 2A in consideration of the ease of removing the mold at the time of molding. May be formed in. The outer peripheral surface of the convex portion 15 or the side wall 11 and the first meat stealing portion 16 are separated by a wall 29. The wall 29 is preferably formed above the second meat stealing portion 24 and is preferably located so that at least a part of the wall 29 overlaps the groove width of the second meat stealing portion 24 so as to extend upward.

As shown in FIG. 2A, for example, the cross-sectional shape of the second meat stealing portion 24 can be formed into an inverted U-shape (dome shape) having a rounded top surface and having strong resistance to ultrasonic vibration. By suppressing (dispersing) the propagation of ultrasonic vibrations to the partition wall 17, the second meat stealing portion 24 can prevent cracks from occurring in the half cut 18 of the partition wall 17. As shown in FIG. 2B, ribs 25 are provided side by side in the second meat stealing portion 24. Since the energy of the ultrasonic vibration is absorbed and dispersed to a certain extent by the rib 25, the co-vibration is suppressed in the vicinity of the flange portion 13 and the second meat stealing portion 24, and the energy concentration unevenness is eliminated. As a result, it is possible to prevent the flange portion 13 and the side wall portion 11 from being deformed in a wavy manner.

As shown in FIG. 2A, the convex portion 15 is formed so that the convex portion 15 fits inside the peripheral wall 22 of the cap 4 in a state where the cap 4 is screwed to the spout 3. By forming the convex portion 15 in this way, as shown in the enlarged view of FIG. 2A, the convex portion 15 faces the inner peripheral surface of the peripheral wall 22 in a state where the cap 4 is screwed to the spout 3. In addition, in this specification, "screw" means that the internal screw 23 of the cap 4 and the external screw 14 of the spout 3 are engaged with each other and these are relatively rotated in the circumferential direction to fit the two. To do. Further, the "state in which the cap 4 is screwed to the spout 3" means a state in which the fitting between the cap 4 and the spout 3 is progressed and completed.

The width A of the first meat stealing portion 16 in the vertical direction is preferably larger than the plate thickness of the flange portion 13, and is preferably 0.60 mm or more, for example. When the groove width of the first meat stealing portion 16 is formed so as to expand inward, the width at the place where the width A is the smallest, that is, the outermost width of the first meat stealing portion 16 is 0.60 mm. The above should be done. By making the width A larger than the plate thickness of the flange portion 13, when a large amount of spouts 3 are stored in random postures such as a parts feeder, the flange portion 13 of the spout 3 becomes the first of the other spouts 3. It is possible to prevent the supply of the spout 3 from being interrupted by being fitted into the meat stealing portion 16.

The wall thickness B of the wall 29 is preferably 0.20 mm or more and 1.00 mm or less, and particularly preferably 0.40 mm or more and 0.80 mm or less. By setting the wall thickness B to 0.20 mm or more, it is possible to prevent the occurrence of pinholes in the manufacturing process, and by setting the wall thickness B to 1.00 mm or less, it is possible to prevent the load required for separating the spout 3 from becoming too large. ..

The cap 4 is formed on the circular top plate 21, the cylindrical peripheral wall 22 suspended from the outer peripheral edge of the top plate 21, and the inner surface of the peripheral wall 22, and is screwed with the outer screw 14 of the spout 3. A screw 23 is provided.

A low-density polyethylene resin or the like can be used as the material of the spout 3, and a polypropylene resin or a high-density polyethylene resin having higher rigidity than the low-density polyethylene resin can be used as the material of the cap 4. The flexural modulus of the material used for the spout 3 is preferably 100 MPa or more and 180 MPa or less, and particularly preferably 120 MPa or more and 155 MPa or less. The spout 3 and the cap 4 can be manufactured, for example, by integral molding.

(blank)
FIG. 3 shows a plan view of a blank 110 which is an example of a blank which is a material of the container body 100 according to the first embodiment. The blank 110 includes roof plates 106a and 106b forming the top 101, folding plates 107 and folding plates 108, four side plates 111 forming the body 102, bottom plates 112 forming the bottom 103, and ends. It has a formed seal portion 113. The blank 110 is formed into a box shape by bending the blank 110 according to the alternate long and short dash line shown in FIG. 3 and sealing the sealing portion 113 at the end portion on the opposite side thereof. A pouring hole 114 for inserting and fixing the spout plug 2 is formed near the center of the roof plate 106a. On the side plate 111, a linear fragile portion 105 is formed on substantially the entire circumference in the width direction, which is the left-right direction when the container body 100 is erected.

For the blank 110, a known sheet material in which a paper base material layer, a barrier layer, or the like is laminated can be used. The fragile portion 105 is composed of, for example, a groove-shaped scratched portion formed at a predetermined depth in the paper base material layer and / or the barrier layer of the blank 110. The scratched portion can be formed to a depth within a range in which the strength of the packaging container 1 can be ensured. As a method for forming the scratched portion, for example, half punching using a blade mold, full punching, laser light processing, or the like can be used. The fragile portion 105 may be formed in a perforated shape or in a straight line in order to secure the strength of the packaging container 1.

The blank 110 and the container body 100 are not limited to this form. As long as the container body 100 can be formed by bending the blank into a box shape and overlapping and sealing the ends, any form such as a rectangular parallelepiped brick type or a tetrahedron-shaped Tetra Pak type can be adopted. In accordance with this, any form can be adopted as the blank form. Further, the fragile portion 105 does not have to be formed.

(Separation method)
Hereinafter, the separation method, which is an example of the separation method of the spout plug 2 provided in the packaging container 1 according to the first embodiment, will be described. 4A to 4D show partially enlarged cross-sectional views of the container body 100 and the spout plug 2 at the time of each step and separation of the spout plug 2 separation method.

FIG. 4A shows a process of crushing the packaging container 1. In this step, the user of the packaging container 1 crushes the body portion 102 by pushing the two facing side plates 111 extending below the roof plate 106 in the direction in which they are in contact with each other. The two side plate 111 and the folded plate 108 in contact with the side plate 111 to be crushed are folded in the internal direction of the packaging container 1.

FIG. 4B shows a step of separating the roof plate 106 including the spout plug 2 from the packaging container 1 along the fragile portion 105. In this step, the user tears a part of the side plate 111 along the fragile portion 105 as shown on the left side of FIG. 4B. As a result, as shown on the right side of FIG. 4B, the packaging container 1 is in a state in which the upper portion of the body portion 102 and the roof plate 106 and the lower portion of the body portion 102 are separately separated.

FIG. 4C shows a process of bending the separated roof plate 106. In this step, as shown in FIG. 4C, the user bends the roof portion 106 near the center of the left and right when the container body 100 is upright. At this time, the polygonal line formed on the roof plate 106 passes through the injection hole 114. As a result, a load is applied so that a part of the flange portion 13 of the spout attached to the injection hole 114 also bends in the same direction as the roof plate 106. The roof plate 106 may be bent at any position as long as the formed folding line can pass through the injection hole 114, but the roof plate 106 is folded from the left and right in the internal direction of the packaging container 1 near the center of the left and right sides of the roof plate 106. Since the folded-back plate 108 does not overlap with the roof plate 106, it can be bent more easily than other positions.

As shown in FIG. 4C, when the flange portion 13 is bent, the side wall portion 11 of the spout 3 also tries to be deformed so as to expand in the bending direction of the roof plate 106. However, when the convex portion 15 is formed on the side wall portion 11, the convex portion 15 comes into contact with the peripheral wall 22 of the cap 4 as soon as the side wall portion 11 starts to be deformed. As a result, the deformation of the side wall portion 11 accompanying the deformation of the roof plate 106 is regulated by the peripheral wall 22 of the cap 4 made of a highly rigid material. Further, even if the convex portion 15 is not formed, the external screw 14 or the side wall portion 11 comes into contact with the peripheral wall 22 of the cap 4, and the deformation of the side wall portion 11 is restricted.

When the flange portion 13 is further bent by further bending the roof plate 106, the wall 29 is curved toward the center of the side wall 11, and a large stress is generated on the wall 29. When the deformation of the roof plate 106 further progresses and the stress acting on the wall 29 exceeds a certain value, at least a part of the wall 29 is broken. If the roof plate 106 is further bent after the fracture occurs, the fracture proceeds in the circumferential direction along the wall 29.

FIG. 4D shows a step of separating the spout plug 2 from the packaging container 1. Since the wall 29 is at least partially broken in the previous step, the user can cut the spout 3 with a slight force from this as a starting point and separate the spout plug 2 from the packaging container 1.

<Second embodiment>
(Packaging container)
FIG. 5 shows the packaging container 5 according to the second embodiment. The packaging container 5 includes a container body 200 formed by bending a blank 210 processed from a sheet material into a box shape and sealing the ends by overlapping the ends, and a spout plug 2. The difference between the packaging container 1 and the packaging container 5 is the formation position of the fragile portion 105. A fragile portion 105 is formed on the roof plate 106, the folding plate 107, and the folding plate 108 of the container body 200 so as to go around the top 101 of the container body 200.

FIG. 6 shows a plan view of a blank 210, which is an example of a blank used as a material for the container body 200 according to the second embodiment. The difference between the blank 110 and the blank 210 is the formation position of the fragile portion 105. The fragile portion 105 of the blank 210 is formed so as to go around the roof plate 106, the folding plate 107, and the folding plate 108 in the width direction which is the left-right direction when the container body 200 is upright. A part of the fragile portion 105 is divided by the injection hole 114. That is, the polygonal line formed by bending the container body 200 along the fragile portion 105 passes through the injection hole 114. The fragile portion 105 may be formed in any direction such as the vertical direction of the container body 200 as long as a part thereof is divided by the injection hole 114.

(Separation method)
Hereinafter, the separation method, which is an example of the separation method of the spout plug 2 provided in the packaging container 5 according to the second embodiment, will be described. 7A to 7C show partially enlarged cross-sectional views of the container body 200 and the spout plug 2 at the time of each step and separation of the spout plug 2 separation method.

FIG. 7A shows a step of crushing the packaging container 5. In this step, the user of the packaging container 5 crushes the body portion 102 by pushing the two facing side plates 111 extending below the roof plate 106 in the direction in which they are in contact with each other. The two side plate 111 and the folded plate 108 in contact with the side plate 111 to be crushed are folded in the internal direction of the packaging container 5.

FIG. 7B shows a step of bending the packaging container 5 along the fragile portion 105. In this step, the user bends the roof portion 106 along the fragile portion 105 as shown on the left side of FIG. 7B. At this time, the polygonal line formed on the roof plate 106 passes through the injection hole 114. As a result, a load is applied so that a part of the flange portion 13 of the spout attached to the injection hole 114 also bends in the same direction as the roof plate 106.

After that, as shown on the left side of FIG. 7B, the flange portion 13 is bent, and at least a part of the wall 29 is broken. Since this step is the same as the separation method according to the first embodiment, the description thereof will be omitted.

FIG. 7C shows a step of separating the spout plug 2 from the packaging container 5. Since the wall 29 is at least partially broken in the previous step, the user can cut the spout 3 with a slight force from this as a starting point and separate the spout plug 2 from the packaging container 5.

In each of the above embodiments, when the roof plate 106 is bent while the cap 4 made of a highly rigid material is screwed, at least a part of the side wall portion 11 or the convex portion 15 is brought into contact with the peripheral wall 22. The deformation of the side wall portion 11 can be regulated by the cap 4. As a result, the wall 29 can be curved to efficiently concentrate stress on the portion. Therefore, the user of the packaging container 1 can easily separate the spout plug 2.

Further, by providing the convex portion 15 on the side wall portion 11 of the spout 3, the wall thickness of the lower end of the side wall portion 11 can be partially thickened. Therefore, when the roof plate 106 is bent, the convex portion 15 can be brought into contact with the peripheral wall 22 and the deformation of the side wall portion 11 can be regulated by the cap 4, and the stress is more efficiently concentrated on the wall 29. This allows the spout plug 2 to be easily separated. Further, the side wall portion 11 can have sufficient rigidity, and it is possible to prevent the half cut 18 from being damaged by ultrasonic vibration during welding. Further, since the amount of collapse of the side wall portion 11 at the time of screwing can be reduced, the occurrence of overrun can be prevented. Here, overrun means that when an excessive torque is applied to the cap 4 after screwing, the side wall portion 11 collapses inward of the spout 3, and the internal screw 12 of the cap 4 is outside the side wall portion 11. It means getting over the screw 14.

Further, since the first meat stealing portion 16 is formed below the side wall 11 separated from the flange portion 13 which is the transmission path of ultrasonic vibration at the time of welding, welding unevenness is caused as compared with the case where the thin wall portion is formed on the flange portion 13. It can be made less likely to occur.

The spout plugs according to Examples 1 to 3 are prepared, and each of them is welded to a gable top type container body 100 using a blank containing a paper base material having a capacity of 2 liters in an 85 mm square, and then the spout plug is dismantleable. Evaluation, overrun torque measurement, drop fracture test, and dimension measurement were performed. The material of each cap was polypropylene, and the material of each spout was low-density polyethylene. The maximum outer diameter of the peripheral wall of the cap was set to 24.7 mm at the lower end of the cap.

(Example 1)
As the first embodiment, a packaging container in which the spout plug 1 having no convex portion 15 was welded to the container body 100 was prepared. The welding conditions were welding energy: 113J, amplitude: 83%, frequency: 30kHz, welding time: 0.22 seconds or less.

(Example 2)
As the second embodiment, a packaging container 1 in which the spout plug 1 provided with the convex portion 15 was welded to the container body 100 was prepared. The welding conditions were the same as in Example 1.

(Example 3)
As Example 3, a packaging container 1 in which a spout plug 1 provided with a convex portion 15 was welded to a container body 100 was prepared. The welding conditions were welding energy: 130 J, amplitude: 89%, frequency: 30 kHz, welding time: 0.22 seconds or less.

(Separability evaluation)
Ten packaging containers according to Examples 1 to 3 were prepared, and it was evaluated whether or not the spout plug could be easily separated from the packaging container by the separation method according to the first embodiment described above.

(Measurement of overrun torque)
The cap 4 was screwed into each spout, and the torque when the overrun occurred was measured.

(Drop destruction test 1)
The top of the packaging container was turned downward and dropped from a height of 800 mm onto the concrete surface up to three times, and it was evaluated whether the spout plug was damaged and the content liquid leaked out.

(Drop destruction test 2)
Whether or not the spout plug is damaged and the content liquid leaks out by dropping the side plate 111 in contact with the roof plate 106 on which the spout plug 114 is formed downward from a height of 800 mm onto the concrete surface up to three times. Was evaluated.

The evaluation results are shown in Table 1.

In the separability evaluation, although the load required for the separation of Example 1 without the convex portion 15 was slightly larger than that of Examples 2 and 3, the spout plugs according to Examples 1 to 3 were easily packaged. It was confirmed that it could be separated from the container.

Further, in the measurement of the overrun torque, although the overrun torque of Example 1 without the convex portion 15 was slightly smaller than that of Examples 2 and 3, the spout plugs according to Examples 1 to 3 were sufficient. It was confirmed that an excellent overrun torque could be secured and that overrun was unlikely to occur.

Further, in the drop fracture test, the spout plug according to Example 1 was not damaged by the first drop in both the drop tests 1 and 2. Further, the spout plugs according to Examples 2 and 3 were not damaged until the second drop in both the drop tests 1 and 2. From this, it was confirmed that the spout plugs according to Examples 1 to 3 had sufficient strength, and that the effect was particularly remarkable by forming the convex portion 15.

In addition, the height from the bottom surface of the flange portion 13 of the spout plug after welding to the top surface of the top plate 21 was measured, and it was visually confirmed whether or not the first meat stealing portion 16 was deformed by welding. .. In the dimensional measurement, all of the spout plugs according to Examples 1 to 3 had a height satisfying the standard (18.5 mm or less). In addition, no deformation was confirmed in the first meat stealing portion 16 in any of the spout plugs according to Examples 1 to 3. From this, it was confirmed that even if the spout / outlet plug forming the first meat stealing portion 16 is welded, no significant deformation occurs.

As described above, according to the present invention, there is a spout plug that has sufficient rigidity, is not damaged by ultrasonic vibration during welding, and can be easily separated when disassembling the packaging container. The used packaging container can be provided.

The present invention is useful for paper packaging containers and the like that contain liquids and the like.

1, 5 Packaging container 2 Spout plug 3 Spout 4 Cap 11 Side wall part 12 Pedestal part 13 Flange part 14 External screw 15 Convex part 16 First meat stealing part 17 Partition wall 18 Half cut 19 Support 20 Pull ring 21 Top plate 22 Peripheral wall 23 Internal screw 24 Second meat stealing part 29 Wall 100, 200 Container body 101 Top 102 Body 103 Bottom 105 Fragile part 106a, 106b Roof plate 107 Folded plate 108 Folded plate 110, 210 Blank 114 Injection hole

Claims (2)

A container body with a pouring hole and
It has a cylindrical side wall on which an outer screw is formed on the outer peripheral surface and a disk-shaped flange portion provided by extending outward from the lower end edge of the side wall, and the side wall is inserted into the injection hole. A spout having a flange attached to the container body, and a spout plug including a cap screwed into the spout.
The container body is fragile portion which is weakened the breaking strength, the watch Deana mainly formed along a straight line passing through the width direction of, and is formed on the entire periphery in the width direction of the container body,
The spout / outlet plug is a packaging container in which a groove-shaped first meat stealing portion is formed on the inner peripheral surface of the side wall in a region on the lower end side of the external screw and on the upper end side of the flange portion. The first aspect of the present invention, wherein a convex portion is formed on the outer peripheral surface of the side wall, at least on the lower end side of the external screw and on the upper end side of the first meat stealing portion, in which the side wall protrudes in the circumferential direction. Packaging container.

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