JP2023012737A - Method of packaging - Google Patents

Abstract

To provide a method of packaging for producing a skin package having a bottom surface and sidewalls rising from a surrounding of the bottom surface without requiring a process of previously preparing tray-formed backing paper.SOLUTION: A method of packaging comprises inserting backing paper 10 into a die 20 and thereby raising backing-paper sidewalls 12a-12d from a backing-paper bottom surface 11, putting an object to be packaged 30 on the backing-paper bottom surface, and then covering a thermoplastic resin film over the object to be packaged put on the backing-paper bottom surface and making the thermoplastic resin film adhere closely to the backing-paper sidewalls together with the object to be packaged and the surrounding backing-paper bottom surface with the thermoplastic resin film softened and a space between the thermoplastic resin film and the backing paper rendered in a vacuum state, thereby packaging the object to be packaged sandwiched between the backing paper and the thermoplastic resin film and moreover fixing the backing-paper sidewalls in a state of rising from the backing-paper bottom surface.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a method of packaging an article by sandwiching it between a mount and a thermoplastic resin film.

An article placed on a mount is covered with a thermoplastic resin film, the thermoplastic resin film is softened, a vacuum is created between the thermoplastic resin film and the mount, and the thermoplastic resin film is removed by gas pressure or the like. A method of wrapping an article by deforming the article along the outer shape of the article and bringing it into close contact with the surrounding mount is well known as a skin packaging method.

However, in this method, the external shape of the skin package obtained by packaging is the same as the external shape of the article. For this reason, the packaging skin packages can be stacked for transportation or storage only if the shape of the article is suitable for stacking, and skin packages are generally not suitable for stacking. For example, if the article to be packaged is a block of beef, the skin packages obtained by packaging in this manner cannot be stacked as they are. For this reason, the skin packages are usually housed in separate outer boxes or the like, and then these outer boxes or the like are stacked for transportation or storage.

When transporting or storing the skin-packaged body, two steps are required: the step of skin-packaging and the step of housing the skin-packaged body obtained in this step in an outer box or the like. describes a packaging method that produces stackable skin packages in a single step.

In this method, a tray-shaped mount having a bottom surface, side walls rising from the periphery of the bottom surface, and flange portions arranged around the side walls is used as the mount. In addition, as the thermoplastic film, a film having a two-layer structure that is laminated so as to be easily separated from each other is used. The outer layer film is provided with air permeable holes, and the inner layer film is not provided.

First, a tray-shaped mount is placed in a chamber that can be vacuum-sucked, and an item to be packaged is placed on the bottom surface of the mount. A thermoplastic film is then placed over it and a vacuum is drawn in the chamber. After the entire chamber is evacuated in this way, the peripheral edge of the thermoplastic film is adhered to the flange portion of the tray-shaped mount to form a closed space between the tray-shaped mount and the thermoplastic film. do. This space is in a vacuum.

Next, while heating the thermoplastic film, the chamber is opened to introduce air into the chamber. Of the thermoplastic films, the outer layer film is provided with air-permeable holes, while the inner layer film is not provided with such holes, and both are laminated so as to be easily separated from each other. Then, the outer layer film and the inner layer film are separated by introducing air into the chamber. Then, the peeled inner layer film is softened by heat, deformed along the outer shape of the article, adheres closely thereto, and further adheres to the surrounding mount. On the other hand, the outer layer film maintains its original shape without such deformation.

According to this method, the tray-shaped mount can be used as the mount for skin packaging, so the obtained skin packages can be stacked as they are without being housed in an outer box or the like.

WO2017-187766

As described above, according to the packaging method described in Patent Literature 1, skin packaging is performed using a mount having a bottom surface and side walls. It is possible to manufacture stackable skin packages by a single process.

However, in this method, it is necessary to prepare in advance a tray-like mount having a bottom surface and side walls. Therefore, for example, when the tray-like mount is formed by assembling paper blanks, a process of assembling the paper blanks to form the tray-like mount is required before the skin packaging process.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a packaging method for manufacturing a skin package having a bottom surface and sidewalls rising from the periphery of the bottom surface without requiring a step of preparing a tray-shaped mount in advance. do.

That is, the invention according to claim 1 is a method of packaging an object to be packaged by sandwiching it between the mount and the thermoplastic resin film using a mount, a thermoplastic resin film, and a mold,
The mount has a mount bottom and mount side walls rising from the bottom,
a mount inserting step of inserting the mount into the mold to raise the side walls of the mount from the bottom of the mount;
a step of placing an object to be packaged on the bottom surface of the mount inserted into the mold;
The article to be packaged placed on the bottom surface of the mount is covered with the thermoplastic resin film, the thermoplastic resin film is softened, and a vacuum is created between the thermoplastic resin film and the mount, and the article to be packaged is and by adhering the thermoplastic resin film to the side wall of the mount together with the bottom of the mount around it, the object to be packaged is sandwiched between the mount and the thermoplastic resin film, and the side wall of the mount rises from the bottom of the mount. a packaging process that secures the
and a packaging method.

Next, in the invention according to claim 2, the mount has a plurality of mount side walls, and the thermoplastic resin film is brought into close contact with the plurality of mount side walls in the packaging step, Among the regions of the plastic resin film, the length between the regions in close contact with the side walls of the mounting paper is greater than the length between the side walls of the mounting paper when the side walls of the mounting paper are flattened. 2. The thermoplastic resin film is adhered so as to shorten the length, and by adhering the thermoplastic resin film in this way, the mount side wall of the mount is fixed in a state in which it rises from the mount bottom. is the packaging method.

Next, the invention according to claim 3 is characterized in that, in the packaging step, the length between the area in close contact with the bottom surface of the mount and the area in close contact with the side wall of the mount in the area of the thermoplastic resin film is The thermoplastic resin film is adhered so that the length between the bottom surface of the mount and the side wall of the mount is shorter than the length between the mount bottom and the mount when the mount is flattened, and the thermoplastic resin film is adhered in this way to the mount. 3. The packaging method according to claim 1 or 2, wherein the side walls are fixed so as to stand up from the bottom surface of the mount.

Next, the invention according to claim 4 is the packaging method according to any one of claims 1 to 3, characterized in that both the mold and the mounting paper have air permeability.

Next, according to a fifth aspect of the present invention, in the packaging step, vacuum suction is applied through both the mold and the backing paper to create a vacuum state between the thermoplastic resin film and the backing paper. 4. The packaging method according to 4.

Next, according to the sixth aspect of the present invention, the packaging process is performed in a sealed chamber, and the chamber is evacuated to create a vacuum between the thermoplastic resin film and the backing paper. A packaging method according to any one of claims 1 to 4.

In the present invention, by inserting a mount having a bottom surface of the mount and side walls of the mount rising from the bottom of the mount into a mold, the side walls of the mount are raised from the bottom of the mount. Then, in the packaging process, the thermoplastic resin film is brought into close contact with the object to be packaged and the mount, thereby fixing the side wall of the mount to stand up from the bottom of the mount. Therefore, it is not necessary to prepare in advance a tray-shaped mount in which the side walls of the mount stand up from the bottom of the mount, and a skin package having the bottom of the mount and the side walls of the mount standing up from the bottom of the mount can be manufactured. There is an effect that it can be done.

FIG. 1 is an explanatory plan view of a mount according to a first specific example of the present invention. FIG. 2 is an explanatory perspective view of the mold according to the first embodiment of the present invention. FIG. 3 relates to the first embodiment of the present invention, and is an explanatory perspective view for explaining the mount inserting process. FIG. 4 is an explanatory perspective view for explaining the intermediate body obtained in the mount inserting step according to the first embodiment of the present invention. FIG. 5 relates to the first embodiment of the present invention and is an explanatory perspective view for explaining the step of placing the package. FIG. 6 is an explanatory perspective view for explaining the packaging process according to the first embodiment of the present invention. FIG. 7 relates to the first embodiment of the present invention, FIG. 7(a) is an explanatory perspective view for explaining the intermediate obtained by the packaging process, and FIG. 7(b) is an explanatory cross-sectional view thereof. be. FIG. 8 is an explanatory cross-sectional view of the skin package according to the first specific example of the present invention. FIG. 9 is an explanatory cross-sectional view of a skin package according to a second specific example of the present invention. FIG. 10 is an explanatory cross-sectional view of a skin package according to a third specific example of the present invention. FIG. 11 is an explanatory cross-sectional view of a skin package according to a fourth specific example of the present invention. FIG. 12 is an explanatory cross-sectional view of a skin package according to a fifth specific example of the present invention. FIG. 13 is an explanatory cross-sectional view of a skin package according to a sixth specific example of the present invention.

The present invention is a method of packaging an object by sandwiching it between a mount and a thermoplastic resin film. In addition, the present invention uses molds. Therefore, FIG. 1 shows a mount 10 used in the packaging method according to the first embodiment of the present invention. FIG. 2 also shows a mold 20 .

The mount 10 used in the present invention is a flat blank, as shown in FIG. The mount 10 used in this example has a rectangular mount bottom 11 in the center, and mount side walls 12a to 12d are connected to each side of the mount bottom 11 as one side. Mounting sheet bottom surface 11 has a rectangular shape, and mounting sheet side walls 12a to 12d are connected corresponding to four sides thereof, respectively, so that the number of mounting sheet side walls 12a to 12d is also four.

It should be noted that the bottom surface of the mounting paper does not have to be rectangular, and the number of side walls of the mounting paper does not have to match the number of sides of the bottom surface, as in other specific examples to be described later. The number of side walls of the mount may be less than the number of sides of the bottom of the mount.

In either case, the side wall of the mount must be connected to the bottom of the mount so that it can stand up from the bottom of the mount. In this example, the boundary lines (sides of the bottom surface 11) between the mount bottom surface 11 and the mount side walls 12a to 12d are bent as folding lines, so that the mount side walls 12a to 12d can stand up from the mount bottom surface 11. In this example, the four mount side walls 12a to 12d are arranged so that there are substantially no gaps between the side walls 12a to 12d when the side walls 12a to 12d are erected so as to be perpendicular to the bottom surface 11 of the mount. 12a to 12d form a square cylinder.

Next, the mold 20 serves to raise the four mount side walls 12a to 12d from the mount bottom surface 11 by inserting the mount 10 into it. For this reason, the mold 20 has surfaces with which each of the mount bottom surface 11 and the mount side walls 12a to 12d abuts when the mount 10 is inserted. That is, first, the mold 20 has a mold bottom surface 21 that has the same shape and size as the mount bottom surface 11 and on which the mount bottom surface 11 is placed. Four side walls 22a to 22d of the mold stand vertically from the four sides of the bottom surface 21 of the mold. The height of these die side walls 22a to 22d is preferably the same as the height of the mount side walls 12a to 12d or lower than the mount side walls 12a to 12d. When the height of the mold side walls 22a to 22d is the same as or lower than the height of the mount side walls 12a to 12d, when the mount 10 is inserted into the mold 20 and the mount side walls 12a to 12d are raised, the mount side walls Tops of 12a-12d are exposed from tops of mold sidewalls 22a-22d. In this example, the height of the mold side walls 22a to 22d is the same as the height of the mount side walls 12a to 12d. These mount side walls 12a to 12d and mold side walls 22a to 22d are overlapped so that the tops of the mount side walls 12a to 12d and the tops of the mold side walls 22a to 22d are flush with each other.

In the packaging method of the present invention, a mount 10 is inserted into a mold 20 as shown in FIGS. When the mount 10 is inserted into the mold 20 in this way, the four mount side walls 12a to 12d of the mount 10 rise vertically from the mount bottom 11, and the mount bottom 11 of the mount 10 contacts the mold bottom 21 of the mold 20. The four mounting side walls 12a-12d of the mounting board 10 are also in contact with the inner surfaces of the four mold side walls 22a-22d of the mold 20, respectively. Also, in this example, the tops of the mount side walls 12a to 12d and the tops of the mold side walls 22a to 22d are flush with each other.

Next, the object to be packaged 30 is placed on the mount bottom surface 11 of the mount 10 inserted into the mold 20 by this mount inserting step. FIG. 5(a) shows the step of placing the package 30, and FIG. 5(b) shows the state in which the package 30 is thus placed.

Next, as shown in FIG. 6, the thermoplastic resin film 40 is covered so as to cover the article to be packaged 30 placed on the mount bottom surface 11 in this way. The thermoplastic resin film 40 must be wide enough not only to cover the package 30, but also to contact the bottom surface 11 of the mount and the four side walls 12a to 12d of the mount. In this example, as described above, the tops of the mounting side walls 12a to 12d and the tops of the mold side walls 22a to 22d are flush with each other. A thermoplastic resin film 40 can be applied so as to abut on the .

Then, the closed space between the thermoplastic resin film 40 covered in this manner and the mount 10 is brought into a vacuum state, the thermoplastic resin film 40 is softened, and fluid pressure such as air pressure is applied from the outside of the closed space. to deform the thermoplastic resin film 40 .

This packaging process can be performed, for example, by the following method. That is, the mount inserting step and the package placing step are performed in a sealed chamber, and then the entire chamber is evacuated in the same chamber. Then, the thermoplastic resin film 40 is covered in the vacuum chamber, and the thermoplastic resin film 40 is brought into contact with the upper portions of the side walls 12a to 12d and 22a to 22d. A closed space is defined between the plastic resin film 40 and the mount 10 . At this time, both the inside and the outside of this closed space are in the same vacuum state, and there is no pressure difference between them. Next, the thermoplastic resin film 40 is heated and softened using, for example, an infrared heating device, and the chamber is opened to the outside air so that the outside of the closed space is atmospheric pressure. As a result, the thermoplastic resin film 40 that has been softened and exposed to the atmospheric pressure is deformed along the shape of the package 30 and the mounting paper 10 and sticks to the surfaces thereof.

When both the mold 20 and the mount 10 have air permeability, the thermoplastic resin film 40 is placed over the package 30 and the mount 10, and then the thermoplastic resin film 40 is heated and softened. By applying vacuum suction through both the mold 20 and the backing paper 10, the packaging process can be performed with a vacuum state between the thermoplastic resin film 40 and the backing paper 10. FIG.

FIG. 7 shows the intermediate thus produced through the packaging process. In this intermediate, the deformed thermoplastic resin film 40 is in close contact with the outer surface of the package 30 at its center. In the explanatory perspective view of FIG. 7A and the explanatory cross-sectional view of FIG. object contact area) is indicated by reference numeral 43. FIG.

The thermoplastic film 40 is in close contact with the backing paper bottom surface 11 around the wrapped object contact area 43, and in FIGS. 7A and 7B, the bottom contact area is denoted by reference numeral 41. .

Furthermore, outside the bottom contact area 41, the thermoplastic resin film 40 is in contact with both the inner surfaces and the upper portions of the four mount side walls 12a to 12d. In FIGS. 7(a) and 7(b), the regions (side wall contact regions) in close contact with the respective mount side walls 12a to 12d are denoted by reference numerals 42a to 42d corresponding to the respective side walls in close contact. is shown. For example, the area in close contact with the mount side wall 12a is the side wall contact area 42a. Moreover, the area|region which adhere|attaches to the mount side wall 12b is the side wall contact|adherence area|region 42b.

By the way, the four mount side walls 12a to 12d stand up in the vertical direction from the mount bottom surface 11, and the thermoplastic resin film 40 is in close contact with the four mount side walls 12a to 12d thus raised. Substantially no gap exists between the side wall 12a and the mount side wall 12b, and the length of the thermoplastic resin film 40 between the mount side wall 12a and the mount side wall 12b is substantially zero. As a result, the mount side wall 12a and the mount side wall 12b do not fall down and the mount 10 does not become the flat blank shown in FIG. That is, the length between the plurality of side wall contact regions of the thermoplastic resin film 40 is shorter than the length between the plurality of mount side walls when the mount is flattened by laying down the mount side walls. , the mount side walls 12a to 12d can be fixed in a state of standing up from the mount bottom surface 11. As shown in FIG.

Next, the excess area of the thermoplastic resin film 40 is cut off, and the mold 20 is removed to manufacture the skin package 100 (see FIG. 8).

As described above, the thermoplastic resin film 40 is brought into close contact with the four mount side walls 12a to 12d, and the length of the thermoplastic resin film 40 between the adjacent mount side walls is the length of the mount when the mount side walls are laid down. As an example, the present invention is applied to a skin package 100 in which the four mounting side walls 12a to 12d are fixed in an upright state by making the distance between the two mounting side walls shorter than the length between the two mounting side walls when they are blank flat. Although described, the invention is not so limited.

For example, if a thermoplastic resin film is adhered to both the bottom surface of the mount and the side wall of the mount, the length between the area in close contact with the bottom surface of the mount and the area in close contact with the side wall of the mount is such that the side wall of the mount is knocked down to flatten the mount. The thermoplastic resin film is adhered so as to be shorter than the length between the bottom surface of the mount and the side wall of the mount when it is in the state of being in a state of being flat. It can also be fixed in place.

The skin package 200 shown in FIG. 9 is such a package, and in this example, an item having a sharp tip is used as the package 30 . For this reason, the side wall 12 of the mount obliquely rising from the bottom surface 11 of the mount is placed over the object 30 to protect the sharp tip of the object 30. Thus, the mount over the object 30 is covered. A thermoplastic resin film 40 is in close contact with the outer surface of the side wall 12a. The thermoplastic resin film 40 also adheres to the bottom surface 11 of the mount on the opposite side from the outer surface of the mount side wall 12a, passing over the package 30. As shown in FIG. Then, in the area of the thermoplastic resin film 40, the length between the sidewall contact area 42a in close contact with the outer surface side of the mount side wall 12a and the bottom surface contact area 41 in close contact with the mount bottom surface 11 is determined by tilting the mount side wall 12a. It is clear that it is shorter than the length between the mount bottom surface 11 and the mount side wall 12a when the mount is in a flat state. Therefore, in this example, the side wall 12a of the mount does not fall down, and is fixed in a state of standing up from the bottom surface 11 of the mount.

It should be noted that FIG. 9 only shows a cross-section of the package 200, but it seems clear from this FIG. 9 that the mount 10 only has a single mount side wall.

Next, another specific example of the present invention will be described with reference to FIGS. 10 to 13. FIG. 10 to 13 are cross-sectional views for explaining skin packages 300 to 600. FIG.

First, the skin package 300 shown in FIG. 10 is the same as the skin package 100 shown in FIG. 1 except that the lid portion 301 is connected. The skin package 300 can be closed and opened by rotating the lid portion 301 .

Next, FIG. 11 shows an example in which a tissue paper is used as the object 30 to be packaged, and a paper having a hole for taking out the tissue paper is used as the backing paper 10 in the center. The skin wrapper 400 can be placed upside down as shown and the tissue paper can be picked out from the hole centered above. In the figure, 401 indicates the picked tissue paper.

Also, FIG. 12 shows a skin package 500 in which an impact-resistant item is used as the package 30. As shown in FIG. In this skin wrapper 500, the backing paper 10 used has a center of the backing bottom face 11 that is high and a periphery of which is low. The object to be packaged 30, which is vulnerable to impact, is placed in the center of the bottom surface 11 of the mount, and the skin package 500 is housed inside the outer box 501. As shown in FIG. As described above, the object to be packaged 30 is placed in the center of the bottom surface 11 of the mount, so that it is housed in the outer box 501 in a state of floating in the air. However, the impact is not transmitted to the packaged item 30. - 特許庁

Next, FIG. 13 also shows a skin package 600 in which an impact-resistant item is used as the package 30. As shown in FIG. In this skin package 600, the mount side wall 12a stands on one side of the item to be packaged 30, and is erected perpendicularly to the mount bottom surface 11, so that the mount side wall 12a allows the item to be packaged. 30 are protected from impact.

Next, the mount 10, the mold 20 and the thermoplastic resin film 40 will be described.

First, the mount 10 can be composed of any sheet. The sheet may have a single-layer structure or a multi-layer structure.

For example, it is a single-layer sheet made of resin. For example, a sheet of polyolefin resin, polyester resin, polyamide resin, polyvinyl chloride resin, polyacrylic acid resin, polyacrylic acid ester resin, or the like can be used. Examples of polyolefin resins include polyethylene resins, polypropylene resins, polybutene resins, and copolymers of ethylene and vinyl acetate. By perforating ventilation holes in these single-layer resin sheets, the air-permeable mount 10 can be obtained.

Also, the mount 10 can be made of paper. For example, paperboard. When the mount 10 is made of paper such as cardboard, it itself has air permeability. The basis weight of the paper is arbitrary, but it is desirable to use paper with a basis weight of 100 to 1000 g/m ² .

Moreover, the mount 10 can also be configured by a laminated sheet having a multilayer structure by laminating these resin sheets and papers. Even when the laminate sheet having a multilayer structure is used as the mount 10 in this way, the mount 10 can be made breathable by providing ventilation holes penetrating the entire laminate sheet.

Mold 20 can then be formed of any material. For example, resin. Although the mold 20 made of resin can be manufactured by injection molding, the mold 20 may be manufactured by deep drawing molding such as vacuum molding. At the same time as molding or after molding, it is possible to provide air permeability by providing ventilation holes.

Alternatively, the mold 20 can be formed by molding metal, or the mold 20 can be made of wood. Alternatively, paper can be folded to form a paper box-like mold.

Next, the thermoplastic resin film 40 needs to be softened by heating and deformable by applying fluid pressure such as air pressure to the heated thermoplastic film. Such a thermoplastic resin film 40 may have a single layer structure, or may be a laminated film having a multilayer structure. As the thermoplastic resin film 40 having a single-layer structure, for example, a polyethylene resin film, a polypropylene resin film, an ethylene-vinyl acetate copolymer resin film, or the like can be used. A multilayer structure obtained by laminating these films may also be used.

Finally, as the object to be packaged 30, any solid article that is difficult to deform under fluid pressure can be used. For example, stationery and the like. Moreover, an article having a sharp tip such as scissors may be used, and an article that is easily damaged by impact (for example, ceramics, etc.) can be packaged as the article to be packaged 30 . It may also be a food product, such as a block of beef. Moreover, as described above, it is also possible to use tissue paper as the object to be packaged.

100 to 600: skin package 10: mount 11: mount bottom 12a to 12d: mount sidewall 20: mold 21: mold bottom 22a to 22d: mold sidewall 30: object to be packaged 40: thermoplastic resin film 41: bottom contact area 42a ~2d: side wall contact area 43: package object contact area

Claims (6)

In a method of packaging an object to be packaged by sandwiching it between the mount and the thermoplastic resin film using the mount, the thermoplastic resin film, and the mold,
The mount has a mount bottom and mount side walls rising from the bottom,
a mount inserting step of inserting the mount into the mold to raise the side walls of the mount from the bottom of the mount;
a step of placing an object to be packaged on the bottom surface of the mount inserted into the mold;
The article to be packaged placed on the bottom surface of the mount is covered with the thermoplastic resin film, the thermoplastic resin film is softened, and a vacuum is created between the thermoplastic resin film and the mount, and the article to be packaged is and by adhering the thermoplastic resin film to the side wall of the mount together with the bottom of the mount around it, the object to be packaged is sandwiched between the mount and the thermoplastic resin film, and the side wall of the mount rises from the bottom of the mount. a packaging process that secures the
A packaging method comprising: The mount has a plurality of mount side walls, the thermoplastic resin film is brought into close contact with the plurality of mount side walls in the packaging step, and the plurality of mounts are included in the area of the thermoplastic resin film. The thermoplastic resin film is brought into close contact with the side walls so that the length between the regions in close contact with the side walls is shorter than the length between the side walls of the base paper when the side walls of the base paper are flattened. 2. The method of packaging according to claim 1, wherein the side walls of the mount are fixed in a state of standing up from the bottom of the mount by adhering the thermoplastic resin film. In the packaging step, the length between the area in close contact with the bottom surface of the mount and the area in close contact with the side wall of the mount in the area of the thermoplastic resin film is the length when the side wall of the mount is knocked down to make the mount flat. Adhering the thermoplastic resin film so as to be shorter than the length between the bottom surface of the mounting paper and the side wall of the mounting paper, and fixing the side wall of the mounting paper in a state of standing up from the bottom surface of the mounting paper by adhering the thermoplastic resin film in this way. The packaging method according to claim 1 or 2, characterized by: 4. The packaging method according to any one of claims 1 to 3, wherein both the mold and the mount have air permeability. 5. The packaging method according to claim 4, wherein in said packaging step, vacuum suction is applied through both the mold and the backing paper to create a vacuum state between the thermoplastic resin film and the backing paper. 5. The packaging process according to any one of claims 1 to 4, wherein the packaging step is performed in a sealed chamber, and the chamber is evacuated to create a vacuum between the thermoplastic resin film and the backing paper. Packaging as described.

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