JP2000094503A - Packaging container and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container in which collar parts, overlap width parts, of an upper material and a lower material are prevented from protruding from the outer wall of the container which is formed by vacuum forming and in which the upper and lower materials are laminated. SOLUTION: In a packaging container which is formed by the vacuum forming of a synthetic resin, has a housing recessed part 32 enclosed by a double wall comprising an inner wall 38 and an outer wall 37 which is connected with the inner wall 38 at the upper end and covers the inner wall 38, and is equipped with an upper material 33 having a collar part 46 protruding outside at the lower end of the outer wall 37 and a lower material 42 which is fitted to the collar part 46 of the upper material 33 to cover the bottom surface side of the recessed part 32, an inclined surface 44 which is curved inside and narrowed downward is formed in the lower part of the outer wall 37 so that the outward end of the collar part 46 is formed to be prevented from protruding substantially outside the outermost part of the outer wall 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container formed by vacuum forming a flat synthetic resin material and a method of manufacturing the packaging container.

[0002]

2. Description of the Related Art The structure of a conventional packaging container formed by vacuum forming will be described with reference to plan views, side views and cross-sectional views of FIGS. The conventional packaging container 10 includes an upper member 11 provided with a storage recess 12 for strictly protecting and storing a storage item (not shown) such as an electronic component, and the like, and And a lower member 22 attached to the bottom surface of the outer peripheral wall 17 of the upper member 11 so as to close the bottom surface of the member 11. The storage recess 12 formed in the upper member 11 is formed by being surrounded by a vertical rib (vertical rib) 14 and a horizontal rib (horizontal rib) 16.
The vertical ribs 14 and the horizontal ribs 16 are both formed in a double wall structure, and an outer peripheral wall 17 surrounding the outer periphery of the entire packaging container 10 is
The double-walled outer peripheral wall 17 that forms such ribs also serves as the outer wall.

[0003] The outer peripheral wall 17 is provided with a shelf step-shaped portion 18 protruding outward to maintain the strength of the outer peripheral wall 17 itself. Further, a flange portion 20 protruding outward and extending in the horizontal direction is formed at a lowermost portion of the outer peripheral wall 17 below the shelf-shaped portion 18. The flange portion 20 is used as a margin for attaching the lower member 22 and the upper member 11. Further, the formation of the flange portion 20 enables the entire packaging container 10 to be stably installed. The lower member 22 is a flat synthetic resin material, and is attached to the flange 20 as described above, and closes the lower surface of the upper member 11. By attaching the lower member 22 to the upper member 11 to form a packaging container in this manner, deformation of the packaging container 10 such as bending of the outer peripheral wall 17 and twisting of the entire packaging container 10 can be prevented, and stability in installation can be improved. Sex can also be increased. The advantages of forming such a packaging container by vacuum forming are that the thickness can be reduced, so that the material cost can be reduced and the weight can be reduced. It is very effective in that it is not necessary.

[0004]

SUMMARY OF THE INVENTION In a packaging container formed by a vacuum forming process and formed by laminating an upper material and a lower material, a flange portion is provided as a margin portion thereof. However, when a plurality of packaging containers are stacked and transported, the side surfaces of the plurality of packaging containers are collectively held and transported by a transporter. There is a problem that the extra protrusion protrudes in the direction, which hinders the holding of the transfer machine that holds and transports the side surface, and that the transfer cannot be stably performed. In addition, there is a problem that extra space is required for a flange portion protruding outward. In addition, there is another problem that an object is easily caught on a flange portion protruding outward, so that it is likely to collapse when a plurality of the members are stacked.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a packaging container formed by vacuum forming and bonding an upper material and a lower material together. It is an object of the present invention to provide a packaging container in which a flange portion, which is a portion where a lower material extends, does not protrude outward from an outer peripheral wall, that is, a side wall does not protrude, and a method of manufacturing such a packaging container.

[0006]

The present invention has the following arrangement to solve the above-mentioned problems. That is, according to the packaging container of the present invention, a double wall formed by vacuum-forming a synthetic resin material and having an inner peripheral wall and an outer peripheral wall connected to the upper end of the inner peripheral wall and covering the outer side of the inner peripheral wall. An upper member having a storage recess surrounded by the outer peripheral wall and a flange protruding outward at a lower end of the outer peripheral wall; and a flange attached to the upper member so as to cover a bottom side of the storage recess. And a lower material, wherein an inclined surface is formed at a lower portion of the outer peripheral wall so as to taper inward as it goes downward, so that an outer end of the flange portion is the outermost end of the outer peripheral wall. It is characterized in that it is formed so as not to protrude substantially outside than outside. By adopting this configuration, a flange portion as a margin portion for attaching the upper material and the lower material is secured, and the flange portion does not substantially protrude outward from the outermost of the outer peripheral wall. Therefore, even when a plurality of storage containers are stacked, the outer peripheral walls are stacked almost on the same plane, and stable transfer can be performed even by a transfer device that holds and transfers the outer peripheral walls. Further, since there is no portion protruding from the outer peripheral wall, it is not necessary to secure a wide space, and it is possible to provide a packaging container in which objects are hardly caught.

Further, the present invention provides an upper member formed by vacuum forming a synthetic resin material, having a storage recess surrounded by an outer peripheral wall, and having a flange protruding outward at an upper end of the outer peripheral wall. The synthetic resin material is formed by vacuum forming, is surrounded by a wall and has a dish shape, and has a flange protruding outward at an upper end of the wall, and in the flange of the upper material, And a lower material attached so as to cover the bottom side of the storage recess, wherein an inclined surface narrowing inward as it goes upward is formed at an upper portion of a wall portion of the lower material. Thereby, the outer ends of the flanges of the upper member and the lower member are formed so as not to substantially protrude outward from the outermost portion of the wall portion. Even with this configuration, a flange portion as a margin portion for attaching the upper material and the lower material is secured, and since this flange portion does not substantially protrude from the outermost of the wall portion, a plurality of Even when the storage containers are stacked, the walls are stacked on almost the same plane, and stable conveyance can be performed even by a conveyance machine that holds and conveys the walls. Further, since there is no portion protruding from the wall, there is no need to secure a wide space, and it is possible to provide a packaging container in which objects are hardly caught.

Further, the present invention is formed by vacuum forming a synthetic resin material, and is surrounded by a double wall comprising an inner peripheral wall and an outer peripheral wall which is connected to the inner peripheral wall at the upper end and covers the outside of the inner peripheral wall. An upper material having a storage recess, and having a flange protruding outward at the lower end of the outer peripheral wall, and a synthetic resin material formed by vacuum forming, and surrounded by a wall to form a dish shape. A packaging container comprising a flange protruding outward at an upper end of a wall portion, and a lower material attached to the flange portion of the upper material so as to cover a bottom surface side of the storage recess, The upper end of the outer peripheral wall of the upper material is formed with an inclined surface that is narrowed inward as going upward, so that the outer end of the flange portion of the upper material is substantially more than the outermost of the outer peripheral wall. It is formed so as not to protrude outward, and at the lower part of the wall of the lower material, inward as it goes downward By circle inclined surface is formed, outer end of the flange portion of the lower member is also a packaging container are formed so as not to protrude substantially outward from the outermost of the wall portion. According to this configuration, a flange portion as a margin portion for attaching the upper member and the lower member is secured, and the flange portion projects substantially outward from the outermost wall and the outermost portion of the wall portion. Therefore, even when a plurality of storage containers are stacked, the outer peripheral wall and the wall portion are stacked on almost the same plane, and stable transfer can be performed even by a transfer device that holds and transfers the outer peripheral wall and the wall portion. Further, it is not necessary to secure a wide space, and it is possible to provide a packaging container in which objects are hardly caught. In addition, since the lower member includes a convex portion that contacts the bottom surface of the storage concave portion of the upper member,
Deformation of the storage recess can be prevented, and if such packaging containers are stacked, the storage space can be divided in half, so that it is easy to take out the storage object.

According to a method of manufacturing a packaging container according to the present invention, in the method of manufacturing a packaging container according to the first aspect, the flat synthetic resin material is heated to a temperature at which vacuum forming can be performed. A synthetic resin heated to a temperature at which the mold having a mold surface including an undercut surface corresponding to the inclined surface of the upper material and having a plurality of air holes formed therein can be vacuum-formed. Approaching the material, pulling air from each of the air holes to create a vacuum between the mold and the heated synthetic resin material, and bringing the synthetic resin material into close contact with the mold to have the inclined surface. A step of molding into an upper material, a step of covering a box so as to cover the periphery of the upper material which is in close contact with the mold, and drawing air between the box and the upper material to create a vacuum. Sending air into the air holes of the mold to release the upper material. It is characterized in that it comprises the step of attaching the synthetic resin material as the lower material to the flange portion of the upper member that is molded. By adopting this method,
Even if the packaging container with the inclined surface is released in the wide direction of the inclined surface, which is usually difficult to pull out, it can be easily released from the mold, and the deformation at the time of releasing is reduced. Can be.

According to the method for manufacturing a packaging container according to the second aspect of the present invention, there is provided the method for manufacturing a packaging container according to the second aspect, wherein the flat synthetic resin material is heated to a temperature at which the flat synthetic resin material can be vacuum-formed. The step of heating, and a mold having a mold surface including an undercut surface corresponding to the inclined surface of the base material and having a plurality of air holes formed therein, was heated to a temperature at which the vacuum forming process was possible. Approaching the synthetic resin material, drawing air from each air hole to make a vacuum between the mold and the heated synthetic resin material, and bringing the synthetic resin material into close contact with the mold to form the inclined surface; Forming a lower material having a, a step of covering a box so as to cover the periphery of the lower material that is in close contact with the mold, and drawing air between the box and the lower material to a vacuum. And air is blown into the air holes of the mold to release the lower material. A step of vacuum forming the upper member, and a step of attaching the flange of the upper member and the flange of the lower member so as to cover the outside of the formed upper member with the lower member. Is included. According to this method, even when the packaging container on which the inclined surface is formed is released from the mold in the wide direction of the inclined surface, which is usually difficult to remove, the release from the mold can be easily performed. Can be reduced.

Further, according to the method of manufacturing a packaging container according to the present invention, in the method of manufacturing a packaging container according to the third aspect, the first synthetic resin material having a flat plate shape is formed by vacuum forming. And heating the first mold having a mold surface including an undercut surface corresponding to the inclined surface of the upper material and having a plurality of air holes formed therein by vacuum forming. Approaching the first synthetic resin material heated to a desired temperature, drawing air from the air holes to create a vacuum between the first mold and the heated first synthetic resin material, Forming the first synthetic resin material into close contact with the first mold to form an upper material having the inclined surface, and covering the periphery of the upper material in close contact with the first mold; Covering the box with air, and drawing air between the box and the upper material to create a vacuum, A step of blowing air into the air hole of the first mold to release the upper member, a step of heating the second synthetic resin plate to a temperature at which vacuum forming can be performed, and a step of heating the lower member. A second synthetic resin material heated to a temperature at which a second mold having a mold surface including an undercut surface corresponding to the inclined surface and having a plurality of air holes formed therein can be vacuum-formed. , And draw air from each of the air holes to create a vacuum between the second mold and the heated second synthetic resin material, thereby bringing the second synthetic resin material into the second synthetic resin material. A step of molding into a lower material having the inclined surface in close contact with a mold,
A step of covering a box so as to cover the periphery of the lower member that is in close contact with the second mold, and drawing air between the box and the lower member to create a vacuum, A step of blowing air into an air hole of a mold to release the lower member, and a flange portion of the upper member and a flange of the lower member so as to cover the outside of the formed upper member with the lower member. And attaching a part. By adopting this method, even when the packaging container on which the inclined surface is formed is released in the wide direction of the inclined surface, which is usually difficult to remove, the release from the mold can be easily performed, and the release. In this case, deformation can be reduced.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view of the packaging container of the present invention, FIG. 2 is a side view of the packaging container, and FIG.
FIG. 2 shows a cross-sectional view of the packaging container of FIG. The packaging container 30 is made of a synthetic resin material, and has a plurality of storage recesses 32 for storing objects to be stored (not shown) such as electronic components formed by vacuum forming.
3 and a lower member 42 that closes the bottom side of the upper member 33. The storage recess 32 formed in the upper member 33 is surrounded by a vertical rib 34 and a horizontal rib 36,
It is formed in a square partition shape. This packaging container 30 is of a lamination type formed by laminating an upper member 33 and a lower member 42, and a gap 39 is formed between the upper member 33 and the lower member 42.

As shown in FIG. 3, the vertical ribs 34 and the horizontal ribs 36 have a double wall structure in cross section. In particular,
Of the storage recesses 32 formed in the shape of the square section, those located on the outermost side, the vertical ribs 34 and the horizontal ribs 36 are from the inner peripheral wall 38 forming the inner wall surface of the storage recess 32 to the upper end of the inner peripheral wall 38. Is formed by an outer peripheral wall 37 extending downward from an outer end of the upper end wall 41 via an upper end wall 41 extending horizontally. In addition, an inclined surface 44 is formed at a lower portion of the outer peripheral wall 37 so as to be inclined gradually downward and inward. A flange 46 extending in the horizontal direction is provided at the lower end of the outer peripheral wall 37 below the inclined surface 44.
Are formed. The flange 46 is provided at the lower end 4 of the inclined surface 44.
4a, it is formed to extend outward. Further, the outer end 46a of the flange portion 46 is provided so as not to protrude substantially outward beyond the outermost portion of the outer peripheral wall 37 (FIG. 4). On the bottom surface of the flange portion 46, the outer peripheral portion of the flat-shaped lower member 42 is attached by an adhesive. That is, the flange portion 46 has a function as a portion where the lower member 42 and the upper member 33 extend. As described above, since the flange 46 is provided on the outer peripheral wall 37 of the packaging container 30 so as to protrude horizontally from the inclined surface 44 so as not to protrude outward from the outer peripheral wall 37, the lower member 42 and the upper member 33 A margin portion can be secured, and when stacked and transported, the flange 46 and the outer peripheral wall 37 are almost flush with each other, so that even when the outer peripheral wall is held, it is stably held. be able to. In addition, since there is no protrusion projecting outwardly from the outer peripheral wall 37, it is possible to prevent a space from being widened, and prevent the packing containers 30 from being caught and broken when stacked.

FIG. 5 shows a sectional view of another embodiment of the packaging container according to the present invention. The plan view of this embodiment is shown in FIG.
It has the same structure as. The packaging container 40 includes an upper member 49 and a lower member 55. The upper member 49 is made of a synthetic resin material in the same manner as in the above-described embodiment, and is surrounded by vertical ribs 34 and horizontal ribs 36 (FIG. 1) for storing objects (not shown) such as electronic components. A plurality of storage recesses 32 which are surrounded and divided into a square shape are formed by vacuum forming. The vertical ribs 34 and the horizontal ribs 36 are formed in a double wall structure. Of the storage recesses 32, the outermost one of the storage recesses 32 is partitioned from the outside by a wall forming the inner wall surface serving as an outer peripheral wall 56. The upper end of the outer peripheral wall 56 is formed on a flange 57 projecting outward. A wall 58 extending upward is formed on the outer periphery of the lower member 55. Base material 5 by wall 58
5 is formed in a dish shape. A flange 59 formed to protrude outward is provided at the upper end of the wall 58. In addition, an inclined surface 74 that is connected to the flange portion 59 and narrows inward toward the upper side is formed at an upper portion of the wall portion 58. Upper side and upper edge 5 of flange 59
The lower surface of 7 serves as a margin and is attached with an adhesive or the like, and the upper member 49 and the lower member 55 are attached as a whole. As described above, the inclined surface 74 is provided so that the outer end of the flange portion 59 as a portion where the upper member 49 and the lower member 55 overlap does not protrude outward from the outermost portion of the wall portion 58. A marginal portion between the material 55 and the upper material 49 can be secured, and at the time of stacking, the flange portions 59 and the wall portions 58 of the stacked packaging containers 40 are almost flush with each other. Can be stably held.

FIG. 6 shows a sectional view of another embodiment of the packaging container according to the present invention. Note that, like the above-described embodiment, the plan view of this embodiment has the same structure as that of FIG. The packaging container 40 includes an upper member 76 and a lower member 77. The upper member 76 is made of a synthetic resin material in the same manner as in the above-described embodiment, and is surrounded by vertical ribs 34 and horizontal ribs 36 (FIG. 1) for storing objects (not shown) such as electronic components. A plurality of storage recesses 32 are formed by vacuum forming and surrounded by squares. In addition, the vertical rib 34
The horizontal ribs 36 have a double wall structure in cross section.
Further, in particular, the storage recess 32 formed in a square partition shape.
Vertical ribs 34 and horizontal ribs 3 located on the outermost side
6 includes an inner peripheral wall 78 that forms the inner wall surface of the storage recess 32 and an outer peripheral wall 81 that covers the outside of the inner peripheral wall 78 and contacts the outside. The outer peripheral wall 81 and the inner peripheral wall 78
Upper end wall 82 extending outward from the upper portion of inner peripheral wall 78
Are linked by In addition, an inclined surface 84 is formed at a lower portion of the outer peripheral wall 81 so as to be inclined inward toward the lower side. Inclined surface 84
In the lower portion, a flange portion 86 is formed at the lower end of the outer peripheral wall 81 so as to extend outward in the horizontal direction.

The lower member 77 is formed with a wall portion 88 whose outer periphery extends upward. The wall 88 is made of the upper material 7
The outer peripheral wall 81 is substantially flush with the outer peripheral wall 81. In addition, an inclined surface 90 is formed on an upper portion of the wall portion 88 so as to be inclined inward as going upward. Further, a flange 9 extending horizontally outward is provided on the upper end of the inclined surface 90 at the upper end of the wall 88.
1 is formed. Here, the outer end of the flange portion 91 is provided so as not to substantially protrude outward from the outermost portions of the outer peripheral wall 81 and the wall portion 88. On the other hand, the outer end of the flange portion 86 is also provided so as not to substantially outwardly project from the outermost portions of the outer peripheral wall 81 and the wall portion 88. Such a flange 91 and a flange 86
Are bonded to each other by an adhesive, and have a role as a margin portion of the upper member 76 and the lower member 77. In this manner, the inclined surfaces 84 are formed so that the outer ends of the flanges 86 and 91 as the margins between the upper member 76 and the lower member 77 do not protrude outward from the outermost portions of the wall 88 and the outer peripheral wall 81. , 90
Is provided, it is possible to secure a margin between the lower member 77 and the upper member 76, and when stacking and transporting, the flange portions 86 and 91 and the wall portion 8 of the stacked packaging containers 70 are provided.
8 and the outer peripheral wall 81 are almost coplanar,
The wall portion 88 and the outer peripheral wall 81 of the stacked packaging containers 70 can be stably held.

FIG. 7 shows still another embodiment of the packaging container according to the present invention. The same reference numerals are given to the same components as those in the above-described embodiment, and the description will be omitted. The packaging container 50 shown in FIG. 7 is a combination of the upper member 33 of the embodiment shown in FIGS. 1 to 4 and a lower member 52 having a convex portion 54 formed thereon. The lower member 52 is formed by forming a plurality of convex portions 54 protruding upward. The convex portion 54 is made of the upper material 3
3 is provided at the same position as the storage recess 32, and the top 54 a of the projection 54 is formed so as to contact the bottom 32 a of the storage recess 32 of the upper material 33. By providing such protrusions 54 in the lower member 42, the storage recesses 32 of the upper member 33 are provided.
Is held, the strength of the storage recess 32 can be maintained and deformation can be prevented, and the stored objects to be packaged can be reliably protected. In addition, by stacking such packaging containers 50, the bottom side of the convex portion 54 is located above the concave portion 32 for storage, and the top portion 54a of the convex portion 54 is covered from above the concave portion 32 for storage. It becomes a storage space for the stored items, and the storage space is formed in a half-split state. For this reason, the storage object is stored in the storage recess 32.
And the bottom surface of the convex portion 54, so that the upper part of the storage object is exposed and the storage object can be easily taken out.

In the above-described embodiment, the case where four storage recesses each having a rectangular shape in a plan view are formed vertically and horizontally has been described. However, the number, size, and shape of the storage recesses are not limited to those described above, and the present invention is applied to packaging containers having various storage recesses. In the embodiment shown in FIG. 7, the size of the convex portion of the lower material is provided to be the same as the size of the concave portion for storage of the upper material. However, the size of the convex portion is not limited to this. The size may be different from that of the storage recess. That is, it is only required that the top of the projection be provided so as to abut and hold the bottom of the storage recess of the upper material. Further, the base material provided with the protrusions of FIG. 7 may be used in the embodiments shown in FIGS.

Next, a description will be given of a method of manufacturing a packaging container having an inclined surface which is provided on the outer peripheral wall of the upper material as shown in FIGS. I do. First, as shown in FIG. 8, a plate-shaped synthetic resin material 60 is prepared, and an arbitrary end of the synthetic resin material 60 and an end on the side facing the arbitrary end are clamped by a clamp device 62. Hold horizontally. In addition, the clamping device 62
The heater 64 is located above the. This heater 64
Accordingly, the synthetic resin material 60 is heated while being held by the clamp device 62. The heating is performed to a temperature suitable for performing vacuum forming of the synthetic resin material 60, that is, to a so-called softening point.

Here, a mold 6 used for vacuum forming is used.
6 will be described with reference to FIG. The mold 66 is provided on the lower surface side of the synthetic resin material 60 in order to form the synthetic resin material 60 on the upper member 33 of the first embodiment. Mold 6
6, a recess 61 for molding the storage recess 32,
It has an undercut surface 68 at the lower end of the outer peripheral wall 63. The mold 66 has a plurality of air holes 67 at predetermined intervals. A communication space 69 to which each air hole 67 is connected is provided below the mold 66. The communication space 69 is connected to a vacuum pump (not shown) via the connection passage 80. The inclined surface 68 of the mold 66 is coated with a Teflon coating or the like. By applying such a Teflon coating to the inclined surface 68 of the mold 66, the synthetic resin material 60 is formed.
When the mold is released from the mold 66 after being solidified and molded into a molded article, friction between the mold 66 and the molded article is reduced, and the mold is easily released. The mold 66 is provided so as to be able to move up and down.

When the synthetic resin material 60 reaches the softening point at which the vacuum forming process can be performed, the mold 66 is raised and the mold 66 is moved closer to the lower surface of the synthetic resin material 60 (FIG. 9).
Dashed arrow). When the mold 66 approaches the synthetic resin material 60, air is drawn by a vacuum pump from an air hole 67 provided in the mold 66 (solid arrow in FIG. 9). This creates a vacuum between the synthetic resin material 60 and the mold 66,
The synthetic resin material 60 comes into close contact with the mold 66. The mold 70 is released from the mold 66 after a lapse of a predetermined time from the close contact of the synthetic resin material 60 with the mold 66, that is, when it has been gradually solidified from the softening point and molded into the mold 70. At the time of release, the molded product is not completely solidified, and still has some softness.

Next, release of the molded article 70 will be described with reference to FIG. When releasing the molded product 70, first, the box 7 formed so as to cover the periphery of the mold 66.
2 is lowered to cover the periphery of the mold 66. Here, box 7
2 will be described. The box 72 is large enough to cover the periphery of the mold 66 and the molded product 70, and the side edge portion 71 protrudes from the outer peripheral side of the molded product 70. 75 can contact the upper surface. Also,
The box 72 is provided with an air hole 73, and the air hole 73 is connected to a vacuum pump (not shown). By operating this vacuum pump, the inside of the box 72 can be evacuated. The mold 70 is released from the molded product 7.
At the same time, a vacuum is drawn around 0 (between the molded article 70 and the box body 72), and at the same time, air is blown from the air hole 67 of the mold 66. Thereby, the molded article 70 is released from the mold 66. Further, the vacuum around the molded product 70 and the mold 66
Almost simultaneously with sending air from the air hole 67 of the mold 6.
The molded product 70 is completely separated from the mold 66 and released from the mold 66 by lowering the mold 6 (broken arrow in FIG. 10).

As described above, the mold 70 is released from the mold 70 by the suction force when the periphery of the mold 70 is evacuated and the air supplied from the inside of the mold 66. On the surface of the molded product 70 (on the side of the box 72), a force (solid arrow A in FIG. 10) for releasing the mold in a direction perpendicular to the surface of the molded product 70 as shown by a solid arrow in FIG. For this reason, deformation at the time of mold release of the molded article 70 can be reduced,
Moreover, even when the mold is released from the mold 66 having the undercut surface 68 which spreads outward toward the upper side, which is normally difficult to pull out as in the present embodiment, the release is easily performed. Further, at the time of releasing, since the side surface portion 71 of the box body 72 presses the edge portion 75 of the molded product 70 from above,
Since the force for releasing the molded product 70 in the direction perpendicular to the surface of the molded product 70 is securely applied perpendicularly to the surface of the molded product 70, deformation of the molded product 70 at the time of mold release can be reliably prevented. Further, the effect that the side portion 71 of the box body 72 presses the edge portion 75 of the molded product 70 from above is that the molded product 7
Since the air sent between 0 and the mold 66 can be prevented from escaping to the outside of the box 72, the air sent from the air hole 67 can be used efficiently for mold release. Furthermore, as described above, since the undercut surface 68 of the mold 66 is coated with Teflon, the packaging container according to the present invention has a shape that is normally difficult to pull out upward. Combined with the fact that the inside of the box 72 is evacuated and pushed up from the mold 66 with air, it is possible to easily remove the mold by reducing the catch at this portion.

Next, as shown in FIG. 11, another synthetic resin material in the form of a flat plate is attached to the molded product 70 released from the mold shown in FIG. Here, since the molded article 70 is the upper member 33 of the above-described embodiment, the upper member 33 will be described below. The other flat synthetic resin material is a lower material 4
It is two. That is, the inclined surface 44 is formed on the outer peripheral wall 37 of the released upper member 33, and the edge portion 7 extending outward from the outer peripheral wall 37 below the inclined surface 44.
5 are formed. The lower material 42 is provided on the bottom surface of the edge portion 75.
Is attached using an adhesive. Here, the lower member 42 has a flat shape. Pasting may be performed automatically by a pasting device (not shown) or manually. Thereafter, a portion of the edge portion 75 and the lower member 42 protruding outward from the outer peripheral wall 37 of the upper member 33 is cut using a cutter 79 to form the flange 46 (broken line in FIG. 11). However, as shown in FIG. 11, if the cutter 79 has two blades, the flange 46 may project slightly outward from the outer peripheral wall 37 by half the thickness of the blade of the cutter 79. In this way, the bottom of the outer peripheral wall 37 is formed on the flange 46 that protrudes outward, and the outer end 46a of the flange 46 does not protrude outward than the outer peripheral wall 37. It is possible to manufacture the packaging container in which the inclined surface 44 is formed inward as the outer peripheral wall 37 connected to the end is directed downward, by vacuum forming.

Next, based on FIGS. 12 to 16, a method for manufacturing a packaging container having an inclined surface which protrudes inward as it goes upward in the upper part of the lower material wall as shown in FIG. Will be described. The same components as those in the above-described manufacturing method are denoted by the same reference numerals, and description thereof will be omitted.
First, FIGS. 12 to 14 show a step of vacuum forming a flat synthetic resin material into a lower material 55 having an inclined surface 74 formed thereon. In FIG. 12, the synthetic resin material 60 held by the clamp device 62 is heated by the heater 64 to a softening point which is a temperature suitable for performing vacuum forming.

Next, as shown in FIG. 13, the lower mold 92 is raised from below the synthetic resin material 60 heated to the softening point (broken arrow in FIG. 13). The lower material mold 92 is
The lower member 55 is provided in a shape that can be formed, and a plurality of air holes 95 are formed in the surface. The inclined surface 74 of the lower material 55 is provided below the outer peripheral edge 96 around the lower material mold 92.
Is formed on the undercut surface 94. The undercut surface 94 is provided below the outer peripheral wall 96 of the lower mold 92 so as to incline inward as it goes downward. The air hole 95 is connected to a vacuum pump (not shown) via a communication space 69 provided below the lower mold 92. While bringing the lower material mold 92 closer to the synthetic resin material 60 from below, the vacuum pump is operated to draw air from the air hole 95 (FIG. 1).
3 solid arrow). Then, the space between the synthetic resin material 60 and the lower material mold 92 is evacuated, and the synthetic resin material 60 is closely adhered to the lower material mold 92 and formed into a molded product 98.

Next, as shown in FIG. 14, when releasing the molded product 98, first, the box 72 formed so as to cover the periphery of the lower mold 92 is lowered to lower the lower material. The periphery of the mold 92 is covered. Note that, similarly to the above-described manufacturing method, the box 7
The second side portion 71 can be in contact with the upper surface of the edge portion 99 which protrudes to the outer peripheral side of the molded product 98 and protrudes. The effect of the side surface portion 71 of the box body 72 pressing the edge portion 99 of the molded product 98 is the same as in the above-described example. The mold release of the molded product 98 is performed by drawing a vacuum around the molded product 98 (between the molded product 98 and the box body 72) and, at the same time, releasing the air holes 9 of the lower mold 92.
Air is supplied from 5. Thereby, the molded product 98 is released from the lower material mold 92. Further, the lower mold 92 is lowered almost simultaneously with the evacuation of the periphery of the molded article 98 and the sending of air from the air holes 95 of the lower mold 92 (arrows indicated by broken lines in FIG. 14). The mold 98 is completely separated from the lower mold 92.

As described above, the suction force when the periphery of the molded article 98 is evacuated and the air sent from the inside of the lower material mold 92 are normally used to increase the upward pressure as in this embodiment. Even when the molded product 98 having the inclined surface 74 that is difficult to pull out and that inclines inward as it goes downward is released from the mold upward, it can be easily released. Further, as described above, if the Teflon coating is applied to the undercut surface 94 of the lower material mold 92 as well, it is possible to easily remove the mold by reducing the catch at this portion.

Next, the step of forming the upper member 49 (FIG. 5) will be described. First, the process of the synthetic resin material 60 is shown in FIG.
The description is omitted because it is the same as the case shown in FIG. Next, as shown in FIG. 15, the upper mold 100 is lifted from below the synthetic resin material 60, and air is drawn from the air holes 102 so that the synthetic resin material 60 is removed from the upper mold 1.
Adhere to 00. Reference numeral 102 denotes a recess for forming the storage recess 32. Subsequently, as shown in FIG. 16, the molded article 104 is released from the upper material mold 100. In the present embodiment, since no inclined surface is formed on the upper member 49, the mold release may be performed as conventionally performed in a vacuum forming process. That is, by sending air from the air hole 101 of the upper mold 100, the molded product 1
04 is released from the upper mold 100.

The molded product 98 (lower material 5) released from the mold
5) and the molded article 104 (the upper material 49) are attached to each other to form the packaging container 40. Attachment is performed by using an edge portion 105 formed outside the molded product 104 and a molded product 98.
And the outer edge portion 99 is attached with an adhesive. After attaching the edge portion 105 and the edge portion 99, the outer end of the portion where the edge portion 105 and the edge portion 99 are attached does not project outward from the outer peripheral wall 58 surface of the lower member 55. (Not shown). The edge portion 98 is cut in this way so that the flange portion 5 is flush with the outer peripheral wall 58.
9 is obtained.

As shown in FIG. 6, the packaging container 70 in which the inclined surfaces 84 and 90 and the flanges 86 and 91 are formed on both the upper member 76 and the lower member 77 is also separated from the mold. The mold is formed by covering the periphery of the mold with a box as described above, drawing a vacuum between the box and the molded product, and sending air from inside the mold (not shown). By adopting such a method, even if it is a molded product having an inclined surface that is normally difficult to pull out upward and inclines inward as it goes downward, this molded product is moved upward from the mold. It can be easily released.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the embodiments, and it is noted that many modifications can be made without departing from the spirit of the invention. Of course.

[0033]

According to the packaging container of the present invention, a flange is secured as an extra portion for attaching the upper and lower materials, and the flange is formed on the outer peripheral wall or wall of the packaging container. Does not substantially protrude outward from the outermost part, so that even when a plurality of such storage containers are stacked, the flange portion and the outer peripheral wall or wall portion are almost flush, and the outer peripheral wall or wall portion is held. Stable transport can be performed for the transporting machine. Further, since there is no portion protruding from the outer peripheral wall or the wall portion, it is not necessary to secure a wide space even in the case of stacking and carrying, and it is possible to provide a packaging container in which objects are hardly caught.

According to the method of manufacturing a packaging container according to the present invention, the suction force when vacuum is applied to the periphery of the molded product and the sending of air from the inside of the mold usually cause the packaging product to move upward. Even when a molded product having an inclined surface that inclines inward as it goes down, it is easy to release it from the mold, it is easy to release it. The deformation of the molded article can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a packaging container according to the present invention.

FIG. 2 is a side view of a packaging container.

FIG. 3 is a sectional view of a packaging container.

FIG. 4 is an enlarged view of an outer peripheral wall.

FIG. 5 is a sectional view showing another embodiment of the packaging container.

FIG. 6 is a sectional view showing another embodiment of the packaging container.

FIG. 7 is a cross-sectional view showing a packaging container provided with a projection on a lower material.

FIG. 8 is an explanatory view showing a step of heating a synthetic resin material.

FIG. 9 is an explanatory view showing a step of bringing a synthetic resin material close to a mold.

FIG. 10 is an explanatory view showing a step of releasing a molded product.

FIG. 11 is an explanatory view showing a step of forming a flange by attaching an upper member and a lower member.

FIG. 12 is an explanatory view showing a step of heating a synthetic resin material as a base material when manufacturing another packaging container.

FIG. 13 is an explanatory view showing a process in which a synthetic resin material serving as a base material is approached to a mold when another packaging container is manufactured.

FIG. 14 is an explanatory view showing a step of releasing a molded product (base material) when manufacturing another packaging container.

FIG. 15 is an explanatory view showing a step in which a synthetic resin material as an upper material is brought close to a mold when another packaging container is manufactured.

FIG. 16 is an explanatory view showing a step of releasing a molded product (upper material) when manufacturing another packaging container.

FIG. 17 is a plan view of a conventional packaging container.

FIG. 18 is a side view of a conventional packaging container.

FIG. 19 is a sectional view of a conventional packaging container.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 packaging container 32 storage recess 33 upper material 34 vertical rib 36 horizontal rib 37 outer peripheral wall 38 inner peripheral wall 39 void 40 packaging container 41 upper end wall 42 lower material 43 packaging container 44 inclined surface 45 upper material 46 flange 46a outer end 47 Lower material 49 Upper material 50 Packaging container 51 Flange 52 Lower material 54 Convex part 55 Lower material 56 Outer wall 57 Flange 58 Wall 59 Flange 60 Synthetic resin material 61 Depression 62 Clamp device 63 Outer wall 64 Heater 66 Mold 67 Air hole 68 Undercut surface 69 Communication space 70 Packaging container 71 Side surface portion 72 Box body 73 Air hole 74 Inclined surface 75 End edge portion 76 Upper material 77 Lower material 78 Inner peripheral wall 79 Cutter 80 Connection passage 81 Outer peripheral wall 82 Upper end wall 84 Inclined Surface 86 Flange 88 Wall 90 Slope 91 Flange 92 Die for lower material 94 Undercut surface 95 Air hole 96 Outer circumference Wall 98 Molded product 99 Edge 100 Mold for upper material 101 Air hole 102 Depression 104 Molded product

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E033 BA13 DA08 DC04 DD01 DD12 DE12 FA04 4F202 AG05 AG07 AG24 AG26 AH56 AH58 CA17 CB01 CK32 CM04 CN01 4F208 AG05 AG07 AG24 AG26 AH56 AH58 LH02 LH03 LH06 MA01 MB01 MC01 MW01 MW01MW02

Claims (7)

[Claims] 1. A storage recess formed by vacuum forming a synthetic resin material and surrounded by a double wall comprising an inner peripheral wall and an outer peripheral wall connected at an upper end to the inner peripheral wall and covering the outer side of the inner peripheral wall. And an upper member having a flange protruding outward at a lower end of the outer peripheral wall, and a lower member attached to the flange portion of the upper member so as to cover a bottom surface side of the storage recess. An outer peripheral end of the packaging container, wherein an outer surface of the outer peripheral wall is substantially outer than an outermost end of the outer peripheral wall. A packaging container characterized in that it is formed so as not to protrude to the side. 2. An upper material formed by vacuum forming a synthetic resin material, having a storage recess surrounded by an outer peripheral wall, and having a flange protruding outward at an upper end of the outer peripheral wall, and a synthetic resin material. Is formed by vacuum forming, has a dish shape surrounded by a wall portion, has a flange portion projecting outward at the upper end of the wall portion, and the storage concave portion is provided in the flange portion of the upper material. And a lower material attached so as to cover the bottom surface side of the lower material, wherein an inclined surface narrowing inward as it goes upward at an upper portion of a wall portion of the lower material is formed, A packaging container characterized in that the outer ends of the flanges of the upper material and the lower material do not substantially protrude outward from the outermost part of the wall. 3. A storage recess formed by vacuum forming of a synthetic resin material and surrounded by a double wall comprising an inner peripheral wall and an outer peripheral wall connected at an upper end to the outer peripheral wall to cover the outer side of the inner peripheral wall. And an upper material having a flange protruding outward at the lower end of the outer peripheral wall, and formed by vacuum forming a synthetic resin material, and surrounded by a wall to form a dish, and at the upper end of the wall. A packaging container comprising a flange protruding outward, and a lower material attached to the flange of the upper material so as to cover a bottom surface side of the storage recess, An upper end of the outer peripheral wall is formed with an inclined surface that is tapered inward as going upward, so that the outer end of the flange portion of the upper material projects substantially outward from the outermost part of the outer peripheral wall. The inclined surface which is formed so as not to be inwardly, and which is inwardly tapered in a downward direction at a lower portion of the wall portion of the lower material. A packaging container characterized by being formed so that an outer end of a flange portion of the lower material does not substantially protrude outward from an outermost portion of the wall portion. 4. The packaging container according to claim 1, wherein the lower member has a convex portion that comes into contact with a bottom surface of the concave portion for storing the upper material. 5. The method of manufacturing a packaging container according to claim 1, wherein the step of heating the flat synthetic resin material to a temperature at which vacuum forming can be performed, and A mold having a mold surface including an undercut surface to be formed and having a plurality of air holes formed therein is brought close to the synthetic resin material heated to a temperature at which the vacuum forming process can be performed, and air is blown from each of the air holes. Vacuuming the space between the mold and the heated synthetic resin material by pulling the synthetic resin material into close contact with the mold to form an upper material having the inclined surface; and A step of covering a box body so as to cover the periphery of the upper material that is in close contact with, and drawing air between the box body and the upper material to create a vacuum,
A step of sending air into the air hole of the mold to release the upper member, and a step of attaching a synthetic resin material as a lower member to the flange portion of the formed upper member. Manufacturing method of packaging container. 6. The method for manufacturing a packaging container according to claim 2, wherein the step of heating the flat synthetic resin material to a temperature at which vacuum forming can be performed, and A mold having a mold surface including an undercut surface to be formed and having a plurality of air holes formed therein is brought close to the synthetic resin material heated to a temperature at which the vacuum forming process can be performed, and air is blown from each of the air holes. Vacuuming the space between the mold and the heated synthetic resin material by pulling the synthetic resin material into close contact with the mold to form a lower material having the inclined surface; and A step of covering the box so as to cover the periphery of the lower member that is in close contact with the container, and drawing air between the box and the lower member to create a vacuum,
Sending air into the air holes of the mold to release the lower material, vacuum forming the upper material, and covering the outer side of the formed upper material with the lower material, A method for manufacturing a packaging container, comprising a step of attaching the flange of the upper material and the flange of the lower material. 7. The method for manufacturing a packaging container according to claim 3, wherein the step of heating the first synthetic resin material in a flat plate shape to a temperature at which vacuum forming can be performed; A first surface having a mold surface including an undercut surface corresponding to the surface and having a plurality of air holes formed therein;
Is heated to a temperature at which the vacuum forming process can be performed.
, And draw air from the air holes to evacuate the space between the first mold and the heated first synthetic resin material. A step of forming the upper member having the inclined surface in close contact with the first mold, and a step of covering a box so as to cover the periphery of the upper member in close contact with the first mold; While drawing air between the box and the upper material to create a vacuum,
A step of blowing air into the air hole of the first mold to release the upper member; a step of heating a second plate-shaped synthetic resin material to a temperature at which vacuum forming can be performed; A mold surface including an undercut surface corresponding to the inclined surface, and a plurality of air holes are drilled.
Is heated to a temperature at which the vacuum forming process can be performed.
, And draw air from each of the air holes to evacuate the space between the second mold and the heated second synthetic resin material. A step of forming a lower material having the inclined surface in close contact with the second mold; and a step of covering a box so as to cover the periphery of the lower material in close contact with the second mold, While drawing air between the box and the lower material to create a vacuum,
Sending air into the air hole of the second mold to release the lower member, and a flange of the upper member so as to cover the outside of the formed upper member with the lower member. Attaching a flange portion of a lower material to the packaging material.