JP2008155937A - Metal foil molded container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the formation in a metal foil molded container during cooking, as a result from dry heating. <P>SOLUTION: A recessed part 12c composed of an internal inclined part 12a and an external inclined part 12b is formed by receding the peripheral wall 12 of the container 10 inwards. Food is placed in the container 10 so that the recessed part 12c is covered and the food is frozen. Thus, a food package is prepared. In this state, the recessed part 12c grips the frozen food from side faces so as not to move in the directions of the mouth and bottom of the container 10. This prevents food from being moved upward in the event of the application of impact with the result that an empty space is created between them. Accordingly, even when the container 10 is heated, no dry heating occurs with the result that the formation of a hole in the container 10 is prevented. Where the depth of the recess 12c is 10 mm to 15 mm and the height from the bottom wall 11 is 10 mm to 20 mm, grip performance or suchlike is especially satisfactory. The recessed part 12c is easily formed at a low cost by pressing a pressing tool against the peripheral wall 12 from outside, thereby forming a recess inwards. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal foil molded container in which perforation of a container is suppressed due to empty cooking during cooking, a frozen food package in which food is stored and frozen in this container, and a method for manufacturing the container.

  Frozen pot-baked frozen food packaging can be stored for a long period of time by storing it in a metal foil molded container (hereinafter referred to as a container) in which a metal foil such as aluminum foil is molded. Yes, it can be cooked easily by simply putting it on a gas stove, and after the meal can be made disposable, it is convenient and widely distributed.

However, such a frozen food package may have a hole in the container during cooking, and the contents such as dashi juice may leak out and scatter around, or the leaked material may ignite or ignite. Yes, it was dangerous.
Here, the present inventors have analyzed the perforation phenomenon of the container in detail, and have found that the main cause of the perforation is the formation of a gap between the food and the container.
That is, when analyzed over time, first, the container of the frozen food packaging body and the food are in a close contact state at the time of manufacture, but the container is deformed by impact during handling such as transportation, display, etc. A gap will be generated between the frozen food and the container.
Next, the air that has entered the gap expands during cooking, thereby further widening the gap and further reducing the contact portion between the container and the food.
For this reason, the container is overheated without good conduction of heat from the container to the food, resulting in an empty state.
Then, the soup that has been melted from the frozen state is dripped into the container that has been emptied in this manner, so that a portion of the food suddenly comes into contact with it and boiles, and a large heat load is instantaneously applied to the container. As a result, the structure of the metal foil is destroyed, and a hole is formed in the contact portion.

  Thus, in order to prevent the generation of voids between the food and the container, which is the main cause of perforation, as in Patent Document 1, the bottom wall and the peripheral wall rising from the periphery thereof are provided, and the bottom wall has a high height. There has already been devised an aluminum foil molded container provided with ribs exceeding 1 mm in length and formed so that the bottom area of the ribs occupies 30% or more of the total area of the bottom wall.

When the container bottom wall is reinforced by the ribs having a relatively high height in this way, the strength of the container is improved, so that deformation is less likely to occur even when an impact is applied to the container during handling.
In addition, the height of the ribs and the area occupied by the ribs on the bottom wall are adjusted to a predetermined range that suppresses the movement of the food. The generation of large voids is suppressed.
Therefore, in the container of patent document 1, it is hard to produce a space | gap between a foodstuff and a container, and, thereby, the emptying in the case of heat cooking is suppressed, and the perforation of a container is suppressed by extension.

However, no matter how much the rib height or rib occupies the bottom wall, there is a certain limit due to the structural limitations of restraining from the bottom when restraining the food from rising with the rib on the bottom wall. When an impact load is applied, it is inevitable that a gap is generated between the food and the container.
In particular, as long as there is a rib with a relatively high height on the bottom wall, once the food has lifted off the bottom wall and moved, the food will ride on the rib and a large gap will be created. It will never be resolved.
Japanese Patent Laid-Open No. 10-1128

  Then, this invention makes it the subject to further suppress the perforation accompanying empty-cooking in the case of heat cooking in a metal foil molded container.

  In order to solve the above-described problems, in the present invention, in a metal foil molded container having a bottom wall and a peripheral wall rising from the peripheral edge, an inner inclined portion inclined inward toward the container opening is formed on at least a part of the peripheral wall. It was provided.

  Here, inclining inward toward the container opening means that the container inclines from the bottom wall toward the opening toward the inside from the outside of the container, that is, the portion of the peripheral wall is constricted and stands up, and the inner inclination The part includes not only the case where the peripheral wall rises (vertical direction) and a part of the peripheral direction are inclined inward, but also the case where the entire peripheral wall is inclined inward.

  When such a container is filled with food until it covers at least a part of the inner inclined part and frozen to form a food package, at least part of the container is constricted by the inner inclined part. The frozen food is pressed from the side and cannot move in the opening direction (upper side) from the inner inclined portion.

Therefore, when an impact is applied to the container, the fact that the frozen food floats from the container is significantly reduced compared to the conventional case.
Therefore, a gap is not easily formed between the container and the frozen food, and even if this is cooked, the heat is smoothly transferred from the container to the frozen food. It is greatly reduced compared to the conventional one.
In addition, in order to hold frozen food from the side, there is no need to provide ribs on the bottom wall that are relatively high so as to obstruct food storage, such as the container of Patent Document 1, and the storage portion is effective. Utilization is planned and the volume of containers is reduced.
Similarly, since it is not necessary to provide a rib having a height on the bottom wall, it is possible to make every possible effort to prevent the frozen food from getting on the rib.

Moreover, the recessed part which dents toward the inner side from the outer side of the container was provided in the surrounding wall.
Here, the recessed portion includes not only a case where a part of the rising direction of the peripheral wall is recessed inward, but also a case where the entire rising direction of the peripheral wall is recessed inward.

When such a container is filled with food until it covers the deepest part of the dent of the dent and frozen to form a food package, the frozen food is firmly gripped from the side by the dent, and the frozen food Cannot move in either the opening direction (upper side) or the bottom direction (lower side) of the container.
Therefore, when the container is impacted, it is further reduced that the frozen food is lifted from the container.

Here, as the depth of the recess of the recess is increased, the grip property for the frozen food can be enhanced. However, if the depth is too deep, the storage of the food is hindered.
Therefore, it is preferable to set the depth of the dent in the range of 1 mm to 15 mm, since the grip property is good and the depth is not so great that food storage is hindered.

In particular, when the depth of the recess is in the range of 10 mm to 15 mm, it is more preferable because the depth of the recess is not sufficient and the food grip is not hindered.
The depth of the recess is a straight line connecting the upper edge of the recess, that is, the upper edge of the outer inclined portion, and the lower edge of the recess, that is, the lower edge of the inner inclined portion, from the deepest portion of the recess to the container bottom wall. The length of the straight line when the straight line is lowered in parallel.

  In addition, when the height of the dent portion with respect to the bottom wall of the deepest portion is 1 mm to 20 mm, since the grip is possible even when the amount of the frozen food container filled is relatively small, various amounts and types are available. The food can be stored in a grip state, and is highly versatile.

In particular, when the height relative to the bottom wall is 10 mm to 20 mm, it is more preferable because it grips at a slightly higher position than the bottom of the frozen food and has high stability.
In addition, the height with respect to the bottom wall of the deepest part of a dent of a dent part means the length of the perpendicular | vertical line when a perpendicular is drawn from the deepest part which is the deepest position of a dent to a bottom wall.

  When the recessed portion is provided on the entire circumference of the peripheral wall, the frozen food is gripped from the entire circumference of the side surface and is gripped evenly.

A metal foil molded container provided with a recess is manufactured by pressing a pressing jig from the outside into the peripheral wall of a conventional metal foil molded container having a substantially flat peripheral wall to form a recess. However, it is preferable because it is simple and does not cost.
Here, that the peripheral wall is substantially flat means that the inclination angle of the peripheral wall is substantially constant, and that the container having ribs, ribs, etc. formed on the peripheral wall is flat in a state where it is excluded. means.

  By providing an inner slope or dent on the peripheral wall of the container, the stored frozen food is restrained from the side, and the generation of voids between the container and the frozen food due to the floating of the food is suppressed, which in turn is being cooked. Perforation of the container is suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, an aluminum foil molded container 10 (hereinafter referred to as a container 10) according to the first embodiment includes a bottom wall 11 having a circular shape in plan view, a peripheral wall 12 rising from the periphery thereof, and an upper edge of the peripheral wall 12. From the flange 13 projecting almost horizontally from the flange 13 and the edge winding 14 connected to the outer edge of the flange 13.

  As shown in the drawing, a plurality of relatively small annular ribs 11a for reinforcement are provided on the bottom wall 11 on a concentric circle. A large number of ridges extending in the direction (vertical direction) are formed.

  As shown in FIGS. 1 and 2, the entire circumference of the peripheral wall 12 of the container 10 has an inner inclined portion 12 a that rises inward from the periphery of the bottom wall 11 toward the opening of the container 10, and then outwards toward the opening. And the outer inclined portion 12b that spreads and rises, whereby the entire rising direction of the peripheral wall 12 is recessed from the outer side of the container 10 toward the inner side to form a recessed portion 12c.

  Thus, since the container 10 has the entire peripheral wall 12 bent, the container 10 gives a very fresh impression to the viewer and has a good appearance.

  As shown in FIG. 3, the food 15 (in the figure, udon is illustrated) until the container 10 covers the deepest portion of the recess 12c, that is, the boundary between the inner inclined portion 12a and the outer inclined portion 12b. )) And sealed with a film or the like as indicated by the chain line in the figure and then frozen or frozen and then sealed, the frozen food package 1 according to the embodiment is completed.

  As shown in the figure, the frozen food package 1 cannot be moved in the opening direction or the bottom direction with respect to the container 10 because the frozen food 15 is gripped from the side surface by the recess 12c.

Therefore, even if an impact is applied to the package 1 from the outside, the frozen food 15 does not float from the bottom wall 11 of the container 10, and a gap is not easily generated between the container 10 and the frozen food 15.
Thus, even when the frozen food package 1 is cooked with a gas stove or electromagnetic cooker, the emptying phenomenon hardly occurs and the container 10 is suppressed from being perforated.
In particular, in this embodiment, since the entire peripheral wall 12 is the recessed portion 12c, the frozen food is gripped from the entire side surface, and the grip property is very good.

  In addition, the rib 11a of the bottom wall 11 and the wrinkles of the peripheral wall 12 are in a range that does not impair the effect of the present invention, that is, the ribs 11a are not recessed with the recessed portion 12c so that the frozen food 15 does not ride on. The depth of the ridge is shallower than the depth, and is formed so as not to hinder the grip of the recess 12c.

  Similarly, for reinforcement or the like, as long as the effect of the present invention is not impaired, that is, as long as there is no hindrance to the suppression of the gap, the bottom wall 11 and the peripheral wall 12 are separately provided with vertical ribs or horizontal ribs, It may be embossed.

  Here, the depth d of the recess 12c shown in FIG. 2 (parallel to the bottom wall 11 is a line connecting the peripheral edge of the bottom wall 11 and the upper edge of the peripheral wall 12 from the boundary between the inner slope 12a and the outer slope 12b). The length of the line when the line is lowered is particularly preferably 10 mm to 15 mm from the viewpoint of grip properties and storage space.

  Further, the height h of the dent 12c shown in FIG. 2 (the length of the perpendicular when the perpendicular is lowered to the bottom wall 11 from the boundary between the inner inclined portion 12a and the outer inclined portion 12b) is relatively small in filling amount. It is particularly preferable that the thickness is 10 mm to 20 mm in view of the possibility of gripping when the amount is small and the stability of the grip state.

  This container 10 is manufactured by press-molding an aluminum foil, and is a conventional aluminum foil-molded container C, that is, a peripheral wall rises toward an opening, and its inclination angle is substantially constant. Except that it is simple and inexpensive to manufacture by pressing a pressing jig J from the outside against the peripheral wall of a substantially flat container (hereinafter referred to as a conventional container C) and then denting it toward the inside. .

  In FIG. 4, a pair of thin plate-like pressing jigs J are arranged symmetrically so as to surround the conventional container C from the outer periphery, and can be moved back and forth as indicated by the arrows in the figure. In a state where C is fixed, the pair of pressing jigs J is advanced toward the conventional container C, the peripheral wall of the conventional container C is sandwiched and pressed by the concave meniscus pressing portion, and the concave The example which forms the part 12c is shown.

Further, in FIG. 5, the peripheral wall is sequentially pressed against the tip pressing portion of the fixed pole-shaped pressing jig J while rotating the similar conventional container C as indicated by the arrows in the drawing, An example is shown in which depressions 12c are formed in the entire circumference by sequentially denting the jig J by pressing.
The pressing portion of the pressing jig J is formed in a curved surface so as not to damage the peripheral wall of the conventional container C.

  In addition, for example, the container pressing mold may be shaped so that the recessed portion 12c can be formed, and the recessed portion 12c may be formed simultaneously with the press molding of the container.

  6 and 7 show an aluminum foil molded container 20 (hereinafter referred to as container 20) according to the second embodiment.

  As shown in the figure, the container 20 includes a bottom wall 21 that is circular in plan view, a peripheral wall 22 that rises from the peripheral edge thereof, a flange 23 that protrudes substantially horizontally from the upper edge of the peripheral wall 22, and an edge that is connected to the outer edge of the flange 23. It consists of winding 24.

  Further, as shown in the drawing, the wall of the normal part of the peripheral wall 22 rises toward the opening, but the normal part of the peripheral wall 22 is partly in the rising direction (vertical direction) of the entire periphery. An inner inclined portion 22a that is inclined inward from the wall surface toward the opening, and an outer inclined portion 22b that is continuously inclined toward the opening toward the opening and connected to the wall surface of the normal portion are formed on both the inclined portions. By 22a and 22b, the recessed part 22c dented inward from the normal partial wall surface of the surrounding wall 22 is formed in a part of rising direction of the perimeter of the surrounding wall 22. As shown in FIG.

  Further, as shown in the figure, a plurality of relatively small annular ribs 21a for reinforcement are provided on the bottom wall 21 on a concentric circle, and the peripheral wall 22 has a large number extending in the rising direction (vertical direction) of the peripheral wall.皺 is formed.

  Similarly to the container 10 of the first embodiment, when the frozen food 15 is accommodated in the container 20 to form the frozen food packaging body 1, the container 20 has a recess composed of an inner inclined portion 22a and an outer inclined portion 22b. The frozen food 15 is gripped by the portion 22c so as not to move in the vertical direction (opening direction and bottom direction), so that the frozen food 15 is not lifted up, and hence the gap between the container 20 and the frozen food 15; In addition, it is possible to prevent emptying during cooking and perforation of the container 20 due to emptying.

  Further, unlike the container 10 of the first embodiment, the container 20 has a configuration in which the recessed portion 22c is provided only in a part in the vertical direction, so that it is stored compared to the container 10 of the first embodiment having substantially the same size. The space is large and more food 15 can be stored.

  In addition, for the production, a conventional aluminum foil molded container C is used with a jig J similar to that in the first embodiment, and the pressing force and time are adjusted as appropriate, so that the pressing force is adjusted to the conventional type. Concentrating on a part of the peripheral wall of the container C and locally denting only a part of the peripheral wall 22 in the vertical direction is simple and inexpensive.

  In each said embodiment, since the prevention effect of a float is so high that the contact part of the frozen food 15 and the dent parts 12c and 22c is large, the dent parts 12c and 22c are provided in the perimeter of the circumferential direction of the surrounding walls 12 and 22. However, the present invention is not limited to this, and the peripheral walls 12 and 22 may be provided in a part of the circumferential direction.

Here, in the case where a plurality of the recessed portions 12c and 22c are provided in the circumferential direction, the frozen food 15 is gripped evenly from the side surface when arranged at equal intervals in the circumferential direction, such as the apex of a regular triangle or the apex of a square. Therefore, the grip is stable and preferable.
Thus, if the recessed parts 12c and 22c are formed in a part of the surrounding walls 12 and 22, it is not conspicuous compared with the case where it forms in all, and the appearance is good.

  In addition, the design can be improved by forming a pattern by meandering the recesses 12c and 22c in the vertical direction to form a wavy shape.

  Further, the recesses 12c and 22c may be provided in multiple stages in the rising direction (vertical direction) of the peripheral walls 12 and 22. In that case, even if the grip of the recesses 12c and 22c at a certain step is removed, Since the recesses 12c and 22c of the step are gripped, it is more difficult to lift.

  The inner inclined portions 12a and 22a and the outer inclined portions 12b and 22b constituting the recessed portions 12c and 22c do not have to have uniform inclination angles, and are composed of a plurality of inclined surfaces with different inclination angles in the vertical direction. The inclined surface may be configured to draw a circular arc in the vertical direction.

Moreover, the longitudinal cross-sectional shape of the dent parts 12c and 22c is not restricted to embodiment, It is not limited to what consists of inner inclination parts 12a and 22a and outer inclination parts 12b and 22b.
For example, the longitudinal cross-sectional shape of the recessed parts 12c and 22c may be formed in an arc shape, or may be formed in a U-shape.

  Further, in each embodiment, the containers 10 and 20 are made of an aluminum foil for reasons such as easy molding, low material cost, and easy recycling. However, the present invention is not limited to this. It may be formed from other metal foils such as copper foil and iron foil.

  Moreover, in embodiment, in order to grip the frozen food 15 exactly in the containers 10 and 20, the outer inclination parts 12b and 22b are provided above the inner inclination parts 12a and 22a, and thereby the recessed parts 12c and 22c are formed. In addition, the recessed portions 12c and 22c grip the frozen food 15 so as not to move not only in the opening direction but also in the bottom direction to prevent the occurrence of voids. 22b may be omitted and only the inner inclined portions 12a and 22a may be provided.

When food is stored in the containers 10 and 20 until the inner inclined portions 12a and 22a are partially covered and frozen to form the frozen food packaging body 1, the inner inclined portions 12a and 22a are used to store one of the containers 10 and 20. Therefore, the frozen food 15 cannot move in the opening direction (upper side) from the inner inclined portions 12a and 22a.
Therefore, unlike the case where the recessed portions 12c and 22c are formed by providing the outer inclined portions 12b and 22b, the movement of the frozen food 15 in the bottom direction of the containers 10 and 20 is not necessarily prevented, but the containers 10 and 20 are impacted. When this occurs, the floating of the frozen food 15 from the containers 10 and 20 is significantly reduced as compared with the conventional case.

  The peripheral walls 12, 22 are formed so that the rising direction (vertical direction) and the entire circumferential direction rise from the periphery of the bottom walls 11, 21 toward the opening, and the entire peripheral walls 12, 22 are formed as inner inclined portions 12 a, You may employ | adopt the structure used as 22a.

  Next, the present invention will be further clarified by giving more detailed examples.

First, as in the first embodiment, for the aluminum foil molded container in which the entire vertical direction of the peripheral wall is a recessed portion composed of an inner inclined portion and an outer inclined portion, as shown in Table 1, the depth of the depression, The same number of dents having different dent heights and dent shapes were produced, and Examples 1 to 11 were obtained.
In addition, the same number of conventional aluminum foil molded containers having a flat peripheral wall (without dents) were prepared and used as comparative examples.

In addition, in the column of the concave shape in Table 1, “two lines” means that two concave portions having a circumferential length of about 75 mm are partially provided, and the positions thereof are viewed in plan with the center of the container as the axis of symmetry. It is symmetric.
Similarly, “three lines” means that three recesses having a circumferential length of 75 mm are provided in part, and the positions thereof are arranged at equal intervals and in the vicinity of the apex of a regular triangle in plan view. , “Four lines” means that four recesses having a circumferential length of about 75 mm are partially provided, and the positions thereof are arranged at equal intervals in the vicinity of the apex of the square in plan view.

  Next, the frozen food was stored in the containers of Examples 1 to 11, and then a transportation test, a drop test, and an IH test were performed.

The transportation test is based on transporting these containers containing frozen foods from Osaka to Tokyo by vehicle and checking whether there is a gap between the frozen foods and the containers.
The results are shown in Table 2.
In Table 2, ◎ indicates that almost no voids are generated, ○ indicates that no voids are generated for about 70%, Δ indicates that no voids are generated for about 60%, and × indicates that there are very many voids. Indicates.

The drop test is based on checking whether or not there is a gap between the frozen food and the container by allowing these containers containing frozen food to drop freely from a height of 500 mm.
The results are shown in Table 2.
In Table 2, “◎” indicates that almost no voids are generated, “◯” indicates that no voids are generated for about 70%, “Δ” indicates that no voids are generated for about 60%, and “×” indicates that a large number of voids are generated. Show.

In the IH test, after these transport tests, these containers containing frozen foods are heated in an electromagnetic cooker (IH) to check whether or not an empty-cooking phenomenon occurs.
The results are shown in Table 2.
In Table 2, ◎ indicates that there is almost no air blowing phenomenon, ○ indicates that there is no air blowing phenomenon for about 70%, △ indicates that there is no air blowing phenomenon for about 60%, and x indicates that there is no air blowing phenomenon. Indicates that the phenomenon occurs frequently.

  As can be seen from Table 2, for the container of the comparative example, many voids were generated in both the transportation test and the drop test, whereas for the container of the example, the generation of voids was considerably suppressed.

  In addition, compared to the case where the depth of the dent is 5 mm, 10 mm and 15 mm are less likely to generate a gap, and compared to the case where the height of the dent is 10 mm and 40 mm, 20 mm is less likely to generate a gap. It has been found that the depth of the recess is optimally about 10 mm to 15 mm, and the height of the recess is optimally about 20 mm.

  In addition, it was found that the dent shape is less likely to generate a gap in the order of two lines, three lines, four lines, and the entire circumference, and that the dent on the entire circumference is more effective in suppressing the gap than the local dent.

  Further, as can be seen from Table 2, in the IH test, it was found that the air blowing phenomenon frequently occurred in the container of the comparative example, whereas the air blowing phenomenon was suppressed to a considerable extent in the container of the example.

The perspective view of the aluminum foil molding container concerning a first embodiment Partially cutaway front view of an aluminum foil molded container according to the first embodiment Longitudinal sectional view of a frozen food package according to an embodiment The figure which shows an example of the manufacturing method of the aluminum foil molding container concerning 1st embodiment The figure which shows the other example of the manufacturing method of the aluminum foil shaping | molding container concerning 1st embodiment. The perspective view of the aluminum foil molding container concerning a second embodiment Partially cutaway front view of an aluminum foil molded container according to the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frozen food packaging body 10 according to the embodiment Aluminum foil molded container 11 according to the first embodiment Bottom wall 11a Rib 12 Peripheral wall 12a Inner inclined part 12b Outer inclined part 12c Recessed part 13 Flange 14 Edge winding 15 Frozen food 20 Second Aluminum foil molding container 21 according to the embodiment Bottom wall 21a Rib 22 Peripheral wall 22a Inner inclined part 22b Outer inclined part 22c Depressed part 23 Flange 24 Edge winding C Conventional aluminum foil molded container J Jig for pressing d Depth of the recessed part h Height of the dent

Claims (8)

In a metal foil molding container having a bottom wall and a peripheral wall rising from the periphery of the bottom wall,
A metal foil-molded container, wherein an inner inclined portion that is inclined inward toward the container opening is provided on at least a part of the peripheral wall. In a metal foil molding container having a bottom wall and a peripheral wall rising from the periphery of the bottom wall,
A metal foil molded container, wherein the peripheral wall is provided with a recessed portion that is recessed from the outside to the inside of the container.   The metal foil molding container according to claim 2, wherein the depth of the recess in the recess of the peripheral wall is 1 mm to 15 mm.   The metal foil molding container according to claim 2 or 3, wherein a height from a bottom wall of a deepest portion of the recess in the recess portion of the peripheral wall is set to 1 mm to 20 mm.   The metal foil molding container according to any one of claims 2 to 4, wherein the recessed portion is provided on the entire circumference of the peripheral wall.   The frozen food packaging body which fills the metal foil molding container of Claim 1 with food until it covers at least one part of the inner inclination part of the said surrounding wall, and freezes.   The frozen food packaging body which fills the metal foil molding container in any one of Claims 2-5 with a food until it covers the deepest part of the dent of the said surrounding wall, and freezes.   Manufacture of a metal foil molded container in which a pressing jig is pressed from the outside against the peripheral wall of a metal foil molded container having a bottom wall and a peripheral wall that rises almost flat from its peripheral edge, and the peripheral wall is recessed from the outside to the inside. Method.

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