JP2008030857A - Container for packaging, which has inward protrusion, and its manufacturing mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a molding time to be finished considerably beautifully. <P>SOLUTION: A ceiling panel 21 of a lid body 20 is formed with the inward protrusion 24 formed by folding a synthetic resin sheet doubly at a part located slightly inward from its peripheral edge 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging container formed from a synthetic resin sheet, and more particularly to a packaging container having an inner ridge projecting inwardly on a bottom surface or a top plate, and a production die thereof.

  Various packaging containers formed from synthetic resin sheets have been proposed, and various improvements have been made at present, and functional problems as containers have been almost solved. Then, the demand for pursuing “beauty of appearance” is increasing.

In general, as a method for molding a packaging container from a synthetic resin sheet, there is “vacuum or pressure forming” as proposed in Patent Document 1, for example, and a softened synthetic resin sheet is placed in a mold and molded. Is.
Japanese Patent Publication No. 7-33058, FIG.

  The “method of molding a synthetic resin material container” disclosed in Patent Document 1 does not require a pressurizing die that is slidable up and down in a male bottom molding die used in a conventional molding method. In order to make it possible to form a thread bottom at the bottom of the container only by the male and female molds for molding, as shown in FIG. In the molding method of a synthetic resin material container comprising a male mold for molding and a female mold for molding of a container each having a portion, and heating the synthetic resin material using both the molds, A male leg piece is formed in a convex shape and a female leg for molding is formed in a concave shape, and the synthetic resin material heat-softened in the female mold for molding is used for the molding. Press with a male mold and quickly remove the molding male mold from the molding female mold to A method of molding a synthetic resin material container, wherein "a and then cooled to cure the resin material.

  According to the manufacturing method of Patent Document 1, “in thermoforming of foamable or non-foamable synthetic resin material, an endless yarn bottom or leg piece is molded at an arbitrary position on the bottom of the container and the like at the same time. In addition to forming the bottom of the container with the leg piece, the concave and convex portions form the thread bottom or the outer surface of the leg piece, once form the inner space inside it, and then reduce the pressure. Since the synthetic resin material is pressed into the female mold side together with the male mold for molding and the synthetic resin material is pressed into the inner space, the thickness and filling density can be made larger than the main body portion of the container. It is considered that a stable and completely closed container can be molded.

  However, the manufacturing method of Patent Document 1 uses a “non-foaming synthetic resin material”, although there is no such problem when a container made of a “foaming synthetic resin material” that does not require much surface gloss is produced. In some cases, it is not suitable for satisfying the above-described demand for ensuring “beauty of appearance”.

  That is, in general, when “the synthetic resin material is pressed into the female mold side together with the male mold for molding by pressing down to press fit the synthetic resin material into the inner space”, “non-foaming synthetic resin material (sheet)” The softened "non-foaming synthetic resin material" matches the shape of the mold surface. However, the "non-foaming synthetic resin material" is still completely in the shape of the mold surface. In some cases, the product surface did not have sufficient luster and the “aesthetic beauty” was not ensured.

  In performing molding as in Patent Document 1, there is a “contact method” in which a synthetic resin sheet is brought into contact with the mold surface, and a “non-contact method” in which the synthetic resin sheet is not brought into contact with the mold surface. is there. In the “contact method”, since the synthetic resin sheet is in direct contact with the mold, cooling after molding can be ensured, but it is difficult to completely contact the synthetic resin sheet with the surface of the mold. For example, a slight “waving” portion is generated on the bottom portion or the top plate, for example, and it is difficult to obtain a sufficiently glossy portion.

  In contrast, the “non-contact method” is a method in which an “air pocket” is formed between the synthetic resin sheet and the mold surface, and the “initial surface” shape of the synthetic resin sheet is left as it is. And “waving” as in the “contact method” is less likely to occur. However, in this “non-contact method”, since the “air pool” described above is formed between the synthetic resin sheet and the mold surface, this “air pool” exhibits a heat insulating effect and is cooled through the mold. Insufficient cooling not only causes deformation of the product after molding, but also takes time for molding (7 seconds or more).

  Therefore, the present inventors are able to reduce the molding time in vacuum or pressure molding of the synthetic resin sheet, and how to make it possible to finish the product surface beautifully. As a result of various studies, it is possible to obtain a result by eliminating the “waving” that is a weak point of this “contact method” on the product structure, while improving the cooling efficiency by using the “contact method” as a basis. This led to the completion of the present invention.

  That is, an object of the present invention is to provide a packaging container that can shorten the molding time and can be finished very beautifully, and a manufacturing mold thereof.

In order to solve the above problems, first, the means taken by the invention according to claim 1 will be described with reference numerals used in the description of the best mode described below.
“A packaging container 100 including a container body 10 formed of a synthetic resin sheet 40 and a lid body 20 formed of the synthetic resin sheet 40 to be fitted thereto,
An inward protrusion 24 formed by double-folding the synthetic resin sheet 40 is formed on a portion of the top plate 21 of the lid 20 that is slightly inward from the peripheral edge 23 thereof. Packaging container 100 "
It is.

  That is, the packaging container 100 according to claim 1 includes a container body 10 formed by the synthetic resin sheet 40 and a lid body 20 formed by the synthetic resin sheet 40 so as to be fitted thereto. In particular, as shown in FIGS. 1 to 5, the inner side of the lid 20 in which the synthetic resin sheet 40 is double-folded at a portion located slightly inward from the peripheral edge 23 of the top plate 21. The protrusion 24 is formed.

  As shown in FIGS. 4 and 5, the inward protruding ridge 24 is formed by vacuum forming of a synthetic resin sheet 40 using a manufacturing die 30 described later. ), It is integral with the top plate 21 and is formed in a closed curve along the periphery of the top plate 21 as shown in FIG. Further, as shown in FIGS. 3 to 5, the inner protrusion 24 is formed by folding a part of the synthetic resin sheet 40 in two, and the two folded parts are in close contact with each other. It is in a good condition.

  In other words, the inner ridge 24 has a thickness in which the synthetic resin sheet 40 is folded in two, and is continuous in a closed curve shape in the vicinity of the peripheral edge 23 of the top plate 21. Compared with other parts of the lid 20, the lid 20 has about twice the rigidity. If the closed curved inner ridge 24 has rigidity, the top plate 21 surrounded by the inner ridge 24 has sufficient rigidity even during cooling immediately after molding by the inner protrusion 24. Therefore, the “rippling” phenomenon does not occur during cooling.

  In other words, the lid 20 according to the first aspect of the present invention has sufficient rigidity not only during molding but also after it is formed into a product by the inward protrusion 24 formed on the peripheral edge 23 of the top plate 21. The top plate 21 is almost in the “mirror surface state”. In addition, in forming the inward ridge 24, since the synthetic resin sheet 40 is molded in direct contact with the production mold 30 as described later, the cooling can be performed within a short time. It is a thing.

  Of course, since this inward protrusion 24 hangs down from the top plate 21, since it presses on the accommodation, it will also stabilize the accommodation. The inner protrusion 24 can also be used as a so-called “rib”, and it goes without saying that the rigidity of the lid 20 can be increased.

  Therefore, the lid body 20 according to the first aspect can be finished very beautifully because the molding time can be shortened. As a result, the packaging container having the container body 10 to which the lid body 20 is fitted. 100 can be finished very beautifully because the molding time can be shortened.

In order to solve the above problem, the means taken by the invention according to claim 2 is:
“The packaging container 100 is formed by the synthetic resin sheet 40 and forms a housing space by the bottom surface 11 and the side wall 12 rising from the peripheral edge 13 thereof.
The synthetic resin sheet 40 is double-folded on the bottom surface 11, a portion located slightly inward from the peripheral edge 13 of the bottom surface 11 or a portion located slightly inward from the side wall 12 of the yarn bottom portion 15. Packaging container 100 characterized by forming inwardly extending ridges 14 "
It is.

  That is, the packaging container 100 according to claim 2 assumes a container body 10 itself to which the lid body 20 according to claim 1 is to be fitted, or a “tray-like one” that does not require the lid body 20. The manufacturing method is substantially the same as the case of the lid body 20 of the first aspect.

  That is, as shown in FIG. 2, the packaging container 100 according to claim 2 includes a bottom surface 11, a peripheral edge 13 of the bottom surface 11, a yarn bottom portion 15 formed outside the peripheral edge 13, and the yarn bottom portion. An accommodation space is formed by the side wall 12 rising outside the 15. And in the packaging container 100 of this Claim 2, as shown in the right half of FIG. 2, it is the bottom face 11 in the part located slightly inward from the peripheral edge 13 of this bottom face 11, or FIG. As shown in the left half of FIG. 2, the inner ridge 14 formed by double-folding the synthetic resin sheet 40 is formed in a portion located slightly inward from the side wall 12 of the yarn bottom portion 15. .

  The inward protrusion 14 in the packaging container 100 of claim 2 is exactly the same as the inward protrusion 24 in the lid body 20 of claim 1, and its function and function are the same as those of claim 1. This is the same as the ridge 24.

  Of course, as shown in FIG. 2, the inner protrusion 14 does not protrude from the bottom surface 11 or the bottom surface of the yarn bottom portion 15, and thus, for example, the container body 10 is a lid body 20 of another packaging container 100. Not only does it become an obstacle when placed on the top, but the inner ridge 14 is erected from the bottom surface 11 and the yarn bottom portion 15, and therefore supports the contents from below. Therefore, the contents are also stabilized. The inner protrusion 14 can also be used as a so-called “rib”, and it goes without saying that the rigidity of the container body 10 can be increased.

  Further, in this packaging container 100, the inner ridge 14 or 24 is formed immediately inside each peripheral edge 13 or 23, and in this case, the side wall 12 or 22 and By this cooperation, the rigidity of the bottom surface 11 of the packaging container 100 (container body 10) or the top plate 21 of the lid 20 can be increased. According to the study by the present inventors, the strength is increased by about 10% compared to the conventional product.

  As described above, when the bottom surface 11 of the container body 10 or the top plate 21 of the lid 20 has increased in rigidity, the packaging container 100 as shown in FIG. The rigidity of the entire 100 is very high. For this reason, stability is very good when a lunch box or side dish is put in the packaging container 100 and held in the hand, and the bottom surface 11 or the top plate is also obtained when a plurality of the packaging containers 100 are stacked. Since 21 is not deformed, a large number of packaging containers 100 can be stacked in a stable state without crushing the contents.

  Moreover, the fact that the inner ridges 14 or 24 are formed immediately inside the respective peripheral edges 13 or 23 means that the area of the plane portion constituting the bottom surface 11 and the top plate 21 can be increased. Therefore, the visual field when the inside of the packaging container 100 is visually recognized through the bottom surface 11 and the top plate 21 can be increased.

  Further, in the packaging container 100 or the container main body 10 as described above, the inner ridges 14 or 24 are formed in the immediate vicinity of the peripheral edge 13 or 23. Therefore, the cross-sectional shape at the corner of the peripheral edge 13 or 23 is formed. Can be an acute angle rather than an arc. As a result, the shape at the peripheral edge 13 or 23 of the packaging container 100 or the container body 10 can be sharpened, and an improvement in the design property that “the corners are refreshed” can be secured. is there.

  Therefore, the packaging container 100 according to claim 2 can be finished very beautifully because the molding time can be shortened. In addition, the packaging container 100 not only increases the rigidity of the packaging container 100 so that it can be transported and stacked in a stable state, but it can also ensure the visual recognition of the packaging container 100, and also has a design. It is excellent.

Moreover, in order to solve the said subject, the means which the invention which concerns on Claim 3 took about the packaging container 100 of the said Claim 1 or Claim 2,
“The height of each inward protrusion 14 or 24 is 0.3 to 3 mm”
It is.

  That is, in the packaging container 100 or the lid body 20 according to the third aspect, the height of each of the inner ridges 14 or 24 described above is set to 0.3 to 3 mm. While ensuring the smoothness of the plate 21, the rigidity of the container body 10 or the lid 20 as a packaging container 100 is increased.

  As described above, the height of the inner ridge 14 or 24 must be within a range of 0.3 mm to 3 mm, because the inner ridge 14 or 24 is formed of the synthetic resin sheet 40. This is because the synthetic resin sheet 40 is double-folded without hindering physical properties, so that the minimum height is 0.3 mm (twice the thickness of the synthetic resin sheet 40) by not stretching the synthetic resin sheet 40. On the other hand, even if the height of the inner protrusion 14 or 24 is 3 mm or more, the effect is not increased as the height is increased.

  As a result of the above, the packaging container 100 according to claim 3 exhibits the same function as that of claim 1 or claim 2, and the overall rigidity is increased by the inner protrusion 14 or 24. Therefore, as a synthetic resin sheet 40, which is a material, compared with a conventional product, a product that is reduced in thickness by about 10 to 15% can be sufficiently commercialized.

  Therefore, in the packaging container 100 according to the third aspect, in addition to exhibiting the same function as that according to the first or second aspect, the thickness of the synthetic resin sheet 40 to be used can be reduced. As a result, the overall cost can be reduced.

And the means taken by the invention according to claim 4 is:
“For the packaging container 100 or the lid 20 formed by the synthetic resin sheet 40, the inner ridges 14 and 24 are formed on the bottom surface 11 or the top plate 21 by folding the synthetic resin sheet 40 in half. A manufacturing mold 30 for the packaging container 100,
The first mold surface 31a that forms the side walls 12 and 22, the annular protrusion 31b that forms the peripheral edges 13 and 23 between the side walls 12 and 22 and the bottom surface 11 or the top plate 21, and the annular protrusion 31b is formed inside. A first mold 31 including at least a folding space 31c into which the synthetic resin sheet 40 can be folded and a mold movement space 31d formed inside the folding space 31c;
The first mold 31 is housed in the mold movement space 31d, moves forward and backward within the range of the height of the annular protrusion 31b, and includes at least a second mold surface 32a formed on the same side as the first mold surface 31a. At least a second mold 32;
When the second mold surface 32a moves to the tip of the annular protrusion 31b on the first mold 31 side while the softened synthetic resin sheet 40 is sucked by the second mold surface 32a of the second mold 32, the synthesis is performed. The production mold 30 for the packaging container 100, characterized in that the inner ridges 14, 24 can be formed by folding the resin sheet 40 in the folding space 31c on the first mold 31 side.
It is.

  That is, the manufacturing mold 30 according to claim 4 can reliably manufacture the packaging container 100 or the lid 20 according to claims 1 to 3 described above.

  Since the manufacturing die 30 has to positively form the above-described inner protrusion 14 or 24, a folding space 31c for that purpose is formed in the first die 31. In addition, the manufacturing die 30 can suck air from below the first die 31 and the second die 32 in FIGS. 4 and 5, and of course the first die surface 31 a of the first die 31. The lower surface of the synthetic resin sheet 40 is sucked from the tip of the annular protrusion 31b and the second mold surface 32a which is the upper surface of the second mold 32 in the figure. In addition, the synthetic resin sheet 40 conveyed on the manufacturing mold 30 is heated and softened by a heating device (not shown), and is along the mold surfaces of the first mold 31 and the second mold 32 by suction of air. It has become.

  When the synthetic resin sheet 40 is sucked by the manufacturing mold 30 described above, the second mold 32 is disposed below the mold movement space 31d of the first mold 31, and the annular protrusion 31b on the first mold 31 side. Is arranged 2 to 3 mm below the second mold surface 32a on the second mold 32 side. Here, if the softened synthetic resin sheet 40 is sucked by the first mold 31 and the second mold 32, the synthetic resin sheet 40 has the first mold 31 and the second mold 32 as shown in FIG. It is completely along the mold surface of the mold 32. At this time, it goes without saying that the portion corresponding to the side wall 22 of the lid 20 is in close contact with the first mold surface 31 a of the first mold 31.

  When the second mold 32 is raised to the position shown in FIG. 5A when the synthetic resin sheet 40 is in the state shown in FIG. 4A, a part of the synthetic resin sheet 40 becomes two. A folded inner ridge 14 or 24 is formed. This is because the left side portion of the inner ridge 14 or 24 shown in FIG. 5A is attracted to the annular protrusion 31b side in close contact with the upper inner side of the annular protrusion 31b of the first mold 31. Does not move from. On the other hand, the right side portion of the inner ridge 14 or 24 shown in FIG. 5A is changed to the left side portion shown in FIG. 5A as the second mold 32 is raised. It rises while overlapping. That is, the softened synthetic resin sheet 40 existing on the second mold surface 32a of the second mold 32 overlaps with the left side portion shown in FIG. 5A while being stretched.

  Therefore, as a result of the manufacturing mold 30 according to claim 4 having the above-described configuration and performing the above operation, the manufacturing mold 30 is packaged according to any one of claims 1 to 3. Thus, the container 100, the container body 10 or the lid 20 can be reliably molded.

As described above, the present invention
“A packaging container 100 including a container body 10 formed of a synthetic resin sheet 40 and a lid body 20 formed of the synthetic resin sheet 40 to be fitted thereto,
The inward protrusion 24 formed by double-folding the synthetic resin sheet 40 is formed on a portion of the top plate 21 of the lid 20 that is located slightly inward from the peripheral edge 23. "
Or
“The packaging container 100 is formed by the synthetic resin sheet 40 and forms a housing space by the bottom surface 11 and the side wall 12 rising from the peripheral edge 13 thereof.
The synthetic resin sheet 40 is double-folded on the bottom surface 11, a portion located slightly inward from the peripheral edge 13 of the bottom surface 11 or a portion located slightly inward from the side wall 12 of the yarn bottom portion 15. That the inner ridge 14 formed by the
Therefore, the packaging container 100 which can shorten the molding time and can be finished very beautifully can be provided.

In the invention according to claim 4,
“For the packaging container 100 or the lid 20 formed by the synthetic resin sheet 40, the inner ridges 14 and 24 are formed on the bottom surface 11 or the top plate 21 by folding the synthetic resin sheet 40 in half. A manufacturing mold 30 for the packaging container 100,
The first mold surface 31a that forms the side walls 12 and 22, the annular protrusion 31b that forms the peripheral edges 13 and 23 between the side walls 12 and 22 and the bottom surface 11 or the top plate 21, and the annular protrusion 31b is formed inside. A first mold 31 including at least a folding space 31c in which the synthetic resin sheet 40 can be folded and a mold movement space 31d formed inside the folding space 31c;
The first mold 31 is housed in the mold movement space 31d, moves forward and backward within the range of the height of the annular protrusion 31b, and includes at least a second mold surface 32a formed on the same side as the first mold surface 31a. At least a second mold 32;
When the second mold surface 32a moves to the tip of the annular projection 31b on the first mold 31 side while the softened synthetic resin sheet 40 is sucked by the second mold surface 32a of the second mold 32, the synthesis is performed. By folding the resin sheet 40 in two in the folding space 31c on the first mold 31 side, the inner protrusions 14 and 24 can be formed. "
Therefore, it is possible to provide a manufacturing die 30 for the packaging container 100 that can shorten the molding time and can be finished very beautifully.

  Next, according to the invention according to each claim configured as described above, the container body 10 which is the best mode shown in the drawings or the lid body 20 fitted to the container body 10, and the manufacturing mold 30 for molding them. Will be described. Of course, the container body 10, the lid body 20, and the manufacturing mold 30, which are the best mode, include all of the inventions according to the above claims.

  FIG. 1 shows a lid 20 according to the present invention. As shown in FIG. 2, the lid body 20 is fitted on the upper surface of the container body 10 having the same configuration as the lid body 20, and the packaging body 10 has a housing space inside the container body 10. The container 100 for use is comprised.

  The container body 10 is formed by so-called “sheet molding” of the synthetic resin sheet 40, and as shown in FIG. 2, the container space 10 includes a bottom surface 11 and a side wall 12 rising from the peripheral edge 13 of the bottom surface 11. Is formed. And this container main body 10 forms the inward protrusion 14 formed by folding the synthetic resin sheet 40 double in the part located slightly inward from the peripheral edge 13 of the bottom face 11. .

  As shown in FIGS. 1 and 2, the lid 20 to be fitted to the container body 10 as described above also includes a top plate 21, a side wall 22 continuous to the top plate 21, and these A peripheral edge 23 located between the side wall 22 and the top plate 21 and an inner ridge 24 formed by double folding the synthetic resin sheet 40 are formed at a portion slightly inwardly located. It is what you have.

  Each of the inner ridges 14 and 24 in this best mode is formed immediately inside each peripheral edge 13 or 23 as shown in FIG. 3, for example, and each height thereof is 0.3 to The entire planar shape is a closed curve along the inner side of each peripheral edge 13 or 23 as shown in FIG.

  Further, the inner ridges 14 and 24 in this best mode are formed by the production die 30 shown in FIGS. 4 and 5. As shown in FIG. 4C, the manufacturing mold 30 includes a first mold 31 fixed on the support base 33 and a mold moving space 31d formed in the first mold 31. 2 type 32.

  As shown in FIG. 4B and the like, the first mold 31 includes a first mold surface 31 a that forms the side walls 12 and 22, and a peripheral edge 13 between the side walls 12 and 22 and the bottom surface 11 or the top plate 21. An annular protrusion 31b that forms 23, a folding space 31c that is formed inside the annular protrusion 31b and can be folded into two, and a mold movement space that is formed inside the folding space 31c 31d.

  On the other hand, the second mold 32 is accommodated in the mold movement space 31d of the first mold 31 of the first mold 31, advances and retreats within the range of the height of the annular protrusion 31b, and the same side as the first mold surface 31a. The second mold surface 32a is formed at least.

  In other words, the manufacturing mold 30 is formed by forming the folding space 31 c in the first mold 31 for positively forming the inner protrusion 14 or 24 described above. In addition, the manufacturing die 30 sucks air from the lower side of FIGS. 4 and 5 with respect to the first die 31 and the second die 32, and the first die surface 31 a of the first die 31 is of course. The illustrated lower surface of the synthetic resin sheet 40 shown in FIGS. 4 and 5 is also sucked from the tip of the annular protrusion 31b and the second mold surface 32a which is the illustrated upper surface of the second mold 32.

  When the synthetic resin sheet 40 is sucked by the manufacturing mold 30 as described above, as shown in FIG. 4, the second mold 32 is disposed below the mold movement space 31 d of the first mold 31, The annular protrusion 31b on the first mold 31 side is disposed 2 to 3 mm below the second mold surface 32a on the second mold 32 side. Here, if suction of the softened synthetic resin sheet 40 is performed by the first mold 31 and the second mold 32, the synthetic resin sheet 40 is formed of the first mold 31 and the second mold 32 as shown in FIG. It will be completely along the mold surface of the mold 2 32. At this time, it goes without saying that the portion corresponding to the side wall 22 of the lid 20 is in close contact with the first mold surface 31 a of the first mold 31.

  Then, the manufacturing mold 30 sucks the softened synthetic resin sheet 40 with the second mold surface 32a of the second mold 32, and the second mold surface 32a has an annular protrusion 31b on the first mold 31 side. When moving to the front end, the synthetic resin sheet 40 is folded in two in the folding space 31c on the first mold 31 side.

  That is, when the second mold 32 is raised to the position shown in FIG. 5A when the synthetic resin sheet 40 is in the state shown in FIG. In the folding space 31c formed in the above, a part of the synthetic resin sheet 40 is folded in two to form the inner protrusion 14 or 24. This is because the left side portion of the inner ridge 14 or 24 shown in FIG. 5A is attracted to the annular protrusion 31b side in close contact with the upper inner side of the annular protrusion 31b of the first mold 31. Does not move from. On the other hand, the right side portion of the inner ridge 14 or 24 shown in FIG. 5A is changed to the left side portion shown in FIG. 5A as the second mold 32 is raised. It rises while overlapping. That is, the softened synthetic resin sheet 40 existing on the second mold surface 32a of the second mold 32 overlaps with the left side portion shown in FIG. 5A while being stretched.

  As a result, the packaging container 100, the container body 10, or the lid body 20 having the inner ridges 14 or 24 is reliably formed by the manufacturing mold 30.

  The inner protrusion 14 or 24 configured as described above can be used as a “rib”. In that case, the position where these inner ridges 14 or 24 are to be formed must be changed, and the shape of the production mold 30 must be changed according to the portion where the “rib” is required. It only needs to be improved.

The cover body which concerns on this invention is shown, (a) is a top view, (b) is a front view. FIG. 2 is an enlarged longitudinal sectional view of a packaging container including the lid shown in FIG. 1 and a container body fitted with the lid. The longitudinal cross-section of a cover body is shown, (a) is an enlarged longitudinal cross-sectional view of the 1-1 line | wire part in (b), (b) is a schematic sectional drawing of the left half part of a cover body, (c) is a cover. It is a schematic sectional drawing of the whole body. The manufacturing die of the previous stage which forms an inward protrusion is shown, (a) is an enlarged vertical sectional view of the 2-2 line part in (b), (b) is a schematic cross section of the left half part of a manufacturing die FIG. 3C is a schematic sectional view of the entire manufacturing mold. The manufacturing die after forming the inward ridge is shown, (a) is an enlarged vertical sectional view of the line 3-3 in (b), (b) is a schematic sectional view of the left half of the manufacturing die. (C) is a schematic sectional drawing of the whole manufacturing type | mold. It is a longitudinal cross-sectional view which shows the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Packaging container 10 Container main body 11 Bottom surface 12 Side wall 13 Edge 14 Inner protrusion 15 Yarn bottom part 20 Lid body 21 Top plate 22 Side wall 23 Periphery 24 Inner protrusion 30 Production mold 31 1st type 31a 1st type surface 31b Annular projection 31c Folding space 31d Type moving space 32 Second type 32a Second type surface 33 Support base 40 Synthetic resin sheet

Claims (4)

A packaging container comprising a container body formed of a synthetic resin sheet and a lid formed of a synthetic resin sheet to be fitted thereto,
It is a top plate of the lid, and an inward ridge formed by double folding the synthetic resin sheet is formed on a portion located slightly inward from the periphery of the top plate. Packaging container. A packaging container that is formed of a synthetic resin sheet and that forms an accommodation space with a bottom surface and a side wall that rises from the periphery thereof,
Formed by double-folding the synthetic resin sheet on the bottom surface, a portion located slightly inward from the peripheral edge of the bottom surface, or a portion located slightly inward from the side wall of the yarn bottom portion A packaging container characterized by forming an inward protruding ridge.   The packaging container according to claim 1 or 2, wherein a height of each of the inner protrusions is 0.3 to 3 mm. A packaging container manufacturing mold in which an inner ridge formed by folding the synthetic resin sheet in half is formed on a bottom surface or a top plate of a packaging container or lid formed by a synthetic resin sheet. And
A first mold surface that forms a side wall, an annular protrusion that forms a peripheral edge between the side wall and the bottom surface or the top plate, and an inner side of the annular protrusion, and the synthetic resin sheet is folded in two. A first mold comprising at least a folding space that can be formed and a mold moving space formed inside the folding space;
The second mold is housed in the mold movement space of the first mold, advances and retreats within the range of the height of the annular protrusion, and includes at least a second mold surface formed on the same side as the first mold surface. A mold and at least
When the second mold surface moves to the tip of the annular protrusion on the first mold side while sucking the softened synthetic resin sheet with the second mold surface of the second mold, the synthetic resin sheet is A mold for manufacturing a packaging container, wherein the inner ridge can be formed by folding in two in the folding space on the first mold side.

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