JP6808941B2 - Spout plug and 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 deposition film, or an inorganic oxide vapor deposition 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 enable 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 method of separation, 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 portion 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 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 possibility 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, and 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 a cylindrical side wall, a cylindrical pedestal portion having a larger outer peripheral diameter than the side wall provided at the lower end of the side wall, and extending outward from the lower end edge of the pedestal portion. a spout having a disk-shaped flange portion provided, and a cap attached to the spout, the lower end face of the pedestal portion, a groove-shaped thinned-out part in the side wall and concentrically, sidewall The meat stealing portion is formed from the outer peripheral side to the inner peripheral side from the position where the outer peripheral surface and the upper end surface of the pedestal portion are connected , and the meat stealing portion includes a plurality of ribs for partitioning the meat stealing portion in the circumferential direction, and the outer peripheral surface and the pedestal portion of the side wall. on the outer peripheral side of the upper end face and is connecting position, and a concave groove formed towards the upper end face of the pedestal portion, the ribs in the part and its lower bridging the grooves, the circumferential of the thinned-out part A spout plug having a thin rib portion whose wall thickness in the direction is smaller than the rest of the rib.

Another aspect of the present invention includes a container body provided with a pouring hole and the above-mentioned pouring port plug having a side wall inserted into the pouring hole and a flange attached to the container body. It is a container.

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. Perspective view of the packaging container according to the second embodiment of the present invention. Cross-sectional view and plan 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. 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 which concerns on 1st 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 1 and the spout plug 2 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.

(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 in the width direction, which is the left-right direction when the container body 100 is upright, forms the body 102. It is formed to go around.

FIG. 2 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.

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

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.

On the outer peripheral surface of the side wall portion 11, an outer screw 14 screwed with the inner screw 23 of the cap 4 and a convex portion 15 protruding in the circumferential direction are provided from the upper end side. A disk-shaped partition wall 17 that closes the upper end side and the lower end side is provided on the inner peripheral surface of the side wall portion 11 via a half cut 18. The partition wall 17 is provided with a pull ring 20 via a support column 19.

A groove-shaped meat stealing portion 24 provided concentrically with the side wall portion 11 is formed on the lower end surface of the pedestal portion 12. The meat stealing portion 24 has a concave groove 16 that is gradually deeper than the inner peripheral side on the outer peripheral side from the position where the outer peripheral surface of the side wall portion 11 and the upper end surface of the pedestal portion 12 are connected.

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 external screw 14 of the spout 3. It is provided with an internal screw 23.

As shown in FIG. 3A, a convex portion 15 having a large wall thickness is provided below the side wall portion 11, and the convex portion 15 is a cap 4 in a state where the cap 4 is screwed to the spout 3. It may be formed so as to fit inside the peripheral wall 22. By forming the convex portion 15 in this way, as shown in the enlarged view of FIG. 3, 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, "a state in which the cap 4 is screwed to the spout 3" is a state in which the fitting of the cap 4 and the spout 3 progresses and is completed, and for example, the upper end of the side wall portion 11 is in contact with the cap 4. Say that.

The cross section of the meat stealing portion 24 excluding the concave groove 16 is, for example, as shown in FIG. 3A, an inverted U-shape (dome shape) having a rounded top surface having strong resistance to ultrasonic vibration. Can be formed into. By suppressing (dispersing) the propagation of ultrasonic vibrations to the partition wall 17, the meat stealing portion 24 can prevent cracks from occurring in the half cut 18 of the partition wall 17. As shown in FIG. 3B, ribs 25 are provided side by side in the meat stealing portion 24 as an example. 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 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 11 from being deformed in a wavy manner. The rib 25 does not necessarily have to be formed as long as the influence of the ultrasonic vibration can be sufficiently suppressed by the meat stealing portion 24.

The width of the concave groove 16 may be constant in the vertical direction, or may be narrowed toward the upper side of the pedestal portion 12 as shown in FIG. 3A. As shown in FIG. 3B, a thin portion 26 having a thickness smaller than that of the other portion of the rib 25 in the circumferential direction may be provided at the portion where the concave groove 16 is bridged and below the portion. By appropriately forming the rib 25 and the thin portion 26, the rigidity of the side wall portion 11 can be appropriately adjusted. By forming the wall thickness of the thin portion 26 in the circumferential direction to be thinner than the width of the rib 25, the rib 25 can be broken with a slight force when the spout plug 2 is separated.

The width A of the groove 16 is preferably 0.50 mm or more. The wall thickness B including the bottom portion of the concave groove 16 and the upper surface of the pedestal portion 12 is preferably 0.15 mm or more and 0.70 mm or less, and particularly preferably 0.20 mm or more and 0.50 mm or less. The wall thickness C of the rib thin portion 26 in the circumferential direction is preferably 0.20 mm or less. This is because if the wall thickness C exceeds 0.20 mm, it becomes difficult to separate the spout plug 2.

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.

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.

(blank)
FIG. 4 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, folding plates 107 and folding plates 108 forming the top 101, 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. 4 and sealing the seal 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 upright.

FIG. 5 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.

For the blanks 110 and 210, a known sheet material in which a paper base material layer, a barrier layer and the like are laminated can be used. The fragile portion 105 is composed of, for example, a groove-shaped scratched portion formed at a predetermined depth on the paper base material layer and / or the barrier layer of the blanks 110 and 210. 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 blanks 110 and 210 and the container bodies 100 and 200 are not limited to this form. Any form of the container bodies 100 and 200 can be adopted, such as a rectangular parallelepiped brick type and a tetrahedral tetrapak type, as long as the blank can be formed by bending the blank into a box shape and overlapping and sealing the ends. Therefore, any form of blank can be adopted accordingly. Further, the fragile portion 105 does not have to be formed.

(Separation method 1)
Hereinafter, an example of a method for separating the spout plug 2 provided in the packaging container 1 according to the first embodiment will be described. 6 (a) to 6 (h) show each step according to the separation method 1 of the spout plug 2. 6 (f) and 6 (g) show partially enlarged cross-sectional views of the container body 100 and the spout plug 2 at the time of separation.

<Crushing process>
6 (a) and 6 (b) show the steps 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.

<Roof plate separation process>
6 (c) and 6 (d) show 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 in FIG. 6 (c). As a result, as shown in FIG. 6D, 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.

<Bending process>
(E) to (g) of FIG. 6 show a step of bending the separated roof plate 106. In this step, as shown in FIG. 6 (e), 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 is also bent in the same direction as the roof plate 106. The roof plate 106 may be bent at any position as long as the formed polygonal line can pass through the injection hole 114, but the roof plate 106 is folded from the left and right in the inner 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. 6F, 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, since the side wall portion 11 is formed with the convex portion 15, 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.

When the flange portion 13 is further bent by further bending the roof plate 106, a part of the pedestal portion 12 forming the bottom portion of the concave groove 16 is curved, and a large stress is generated at the portion. When the roof plate 106 is further deformed and the stress acting on a part of the pedestal portion 12 exceeds a certain value, at least a part of the pedestal portion 12 is broken as shown in FIG. 6 (g). If the roof plate 106 is further bent after the side wall portion 11 is broken, the breakage of the pedestal portion 12 proceeds in the circumferential direction.

<Separation process of spout plug separation>
FIG. 6 (h) shows a step of separating the spout plug 2 from the packaging container 1. Since the pedestal portion 12 forming the concave groove 16 of the spout 3 in the previous step is at least partially broken, the user cuts the spout 3 with a slight force starting from this and opens the spout plug 2. It can be separated from the packaging container 1.

(Separation method 2)
Hereinafter, an example of a method for separating the spout plug 2 provided in the packaging container 5 according to the second embodiment will be described. 7 (a) to 7 (f) show each step related to the separation method 2 of the spout plug 2. 7 (d) and 7 (e) show partially enlarged cross-sectional views of the container body 200 and the spout plug 2 at the time of separation.

<Crushing process>
(A) and (b) of FIG. 7 show 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.

<Bending process>
(C) to (e) of FIG. 7 show 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 in FIG. 7 (c). 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 is also bent in the same direction as the roof plate 106.

After that, as shown in FIG. 7 (d), the flange portion 13 is bent, and as shown in FIG. 7 (e), at least a part of the side wall portion 11 is broken. Since this step is the same as the separation method 1, the description thereof will be omitted.

<Separation process of spout plug separation>
FIG. 7 (f) shows a step of separating the spout plug 2 from the packaging container 5. Since the side wall portion 11 forming the concave groove 16 of the spout 3 is at least partially broken in the previous step, the user cuts the spout 3 with a slight force starting from this and opens the spout plug 2. It can be separated 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 is brought into contact with the peripheral wall 22 to bring the side wall portion 11 into contact with the peripheral wall portion 11. The deformation of the roof can be regulated by the cap 4. As a result, a part of the pedestal portion 12 forming the bottom portion of the concave groove 16 is curved, and stress can be efficiently concentrated 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, 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 at the time of 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 concave groove 16 is formed in the pedestal portion 12 which is separated from the flange portion 13 which is the transmission path of the ultrasonic vibration at the time of welding, uneven welding is less likely to occur as compared with the case where the thin-walled portion is formed in the flange portion 13. be able to.

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 substrate 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.

(Example 1)
As the first embodiment, a packaging container was prepared in which a spout plug 1 having no ribs in the concave groove 16 and the meat stealing portion 24 was welded to the container body 100. 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 a spout plug 1 having a rib 25 having a thin portion 26 in the concave groove 16 and the meat stealing portion 24 was welded to the container body 100 was prepared. The welding conditions were the same as in Example 1.

(Example 3)
As the second embodiment, a packaging container 1 in which a spout plug 1 having a rib 25 having a thin portion 26 in the concave groove 16 and the meat stealing portion 24 was welded to the 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 above-mentioned spout plug separation method 1.

(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 to evaluate 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.

(Dimension measurement)
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. Further, with respect to the spout plugs according to Examples 1 and 2, it was visually confirmed whether or not the concave groove 16 was deformed.

The results of each evaluation are shown in Table 1.

From the above evaluation results, it was confirmed that the spout plugs according to Examples 1 to 3 can be easily separated from the packaging container.

Further, it was confirmed that the spout plugs according to Examples 1 to 3 were able to secure sufficient overrun torque and were unlikely to cause overrun.

Further, the spout plug according to Example 1 was not damaged in the first drop of the drop tests 1 and 2. Further, the spout plugs according to Examples 2 and 3 were not damaged in the first and second drops of 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 ribs.

In addition, all of the spout plugs according to Examples 1 to 3 had a height satisfying the standard (18.5 mm or less). Further, a moderate deformation was confirmed in the concave groove 16 of the spout plug according to Examples 1 and 3, and a slight deformation was confirmed in the spout plug according to the second embodiment. All of the deformations were such that they did not interfere with the use of the packaging container. From this, it was confirmed that even if the spout plug having the concave groove 16 formed was welded, no significant deformation occurred.

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 Outlet plug 3 Spout 4 Cap 11 Side wall 12 Pedestal 13 Flange 14 External thread 15 Convex 16 Concave groove 17 Partition 18 Half cut 19 Strut 20 Pull ring 21 Top plate 22 Peripheral wall 23 Internal thread 24 Meat Stealing part 25 Rib 26 Rib Thin part 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 (3)

Cylindrical side wall and
A cylindrical pedestal having a larger outer diameter than the side wall provided at the lower end of the side wall,
A spout having a disk-shaped flange portion extending outward from the lower end edge of the pedestal portion, and a spout.
Including a cap attached to the spout
On the lower end surface of the pedestal portion, a groove-shaped meat stealing portion provided concentrically with the side wall is provided from the outer peripheral side to the inner peripheral side from the position where the outer peripheral surface of the side wall and the upper end surface of the pedestal portion are connected. over it is formed in,
The meat stealing portion faces the upper end surface of the pedestal portion on the outer peripheral side from the position where the plurality of ribs partitioning the meat stealing portion in the circumferential direction and the outer peripheral surface of the side wall and the upper end surface of the pedestal portion are connected. and a concave groove formed Te,
The rib is a spout / outlet plug having a rib thin portion having a wall thickness in the circumferential direction of the meat stealing portion smaller than other portions of the rib at a portion over which the concave groove is bridged and below the portion. The spout plug according to claim 1, wherein the wall thickness between the upper end surface of the pedestal portion and the bottom portion of the concave groove is 0.15 mm or more and 0.70 mm or less. A container body with a pouring hole and
A packaging container comprising the spout plug according to claim 1 or 2, wherein the side wall is inserted into the spout hole and the flange is attached to the container body.

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