JP5941834B2 - container - Google Patents

Description

  The present invention relates to a container (for example, a container for tofu) obtained by thermoforming a thermoplastic resin sheet.

  Conventionally, as this type of container, a thermoplastic resin sheet is thermoformed, and the container is provided with an accommodation recess having an upper surface that is open, and contains objects (for example, tofu and water) in the accommodation recess. A container that is sealed by closing the opening with a resin film is known (for example, Patent Document 1). The housing recess of the container is composed of a bottom wall having a surface for placing an object to be accommodated, and a frame-like side wall erected from the outer peripheral edge of the bottom wall.

  Such containers have conventionally been required to be thin due to the material cost, etc., and in order to exert the necessary strength while being thin, the cross-section inverted U-shape that protrudes to the inside of the container on the bottom wall and side wall What formed the shape-like rib is employ | adopted.

  For example, a long first rib that protrudes from the center region of the bottom wall surface to the outer peripheral edge side, and a plurality of first ribs that are spaced apart in the circumferential direction of the bottom wall, and the bottom wall An annular rib projecting in an annular shape (frame shape) along the circumferential direction so as to connect intermediate positions in the longitudinal direction of all the first ribs at a position between the central region of the surface and the outer peripheral edge; The container provided with is widely used.

  Here, the first rib is reinforced so as to make it difficult to bend the bottom wall from the front surface to the back surface side or vice versa along the longitudinal direction of the first rib against the external force applied to the bottom wall such as the gravity of the object. To do. However, with only the first rib, the bottom wall is easily bent along the circumferential direction intersecting the longitudinal direction of the first rib. Therefore, in such a container, by providing an annular rib along the circumferential direction intersecting the longitudinal direction of the first rib, the bottom wall is reinforced so that it is difficult to bend along the circumferential direction from the front surface to the back surface side or vice versa. ing.

  However, in the above-described conventional container, by providing the annular rib, the bottom wall is easily bent along the radial direction of the annular rib (that is, the longitudinal direction of the first rib), and the gravitational force of the object to be accommodated. When an external force such as is applied to the bottom wall, the bottom wall is easily deformed. Thus, there was room for improvement in terms of the strength of the container.

JP 2007-125008 A

  Then, this invention is made | formed in view of the said problem, and makes it a subject to provide a container which cannot change easily with respect to the external force concerning a bottom wall, such as the gravity of a to-be-contained object.

The container of the present invention is a container thermoplastic resin sheet is thermoformed, and a bottom wall having a back surface which is a surface opposite to the surface and the surface for placing the contained object, the bottom wall A frame-like side wall erected from the outer peripheral edge of the base plate, and a long first rib projecting from the central region of any one surface of the bottom wall to the outer peripheral edge side, the bottom wall A plurality of first ribs spaced apart from each other in the circumferential direction and a position between the central region and the outer peripheral edge of the one surface on which the first rib is provided so as to surround the central region. A second rib projecting along the direction, and each of the second ribs includes a plurality of convex projections that are long in the circumferential direction and spaced apart from each other in the circumferential direction. Crosses the first rib.

  According to the container having such a configuration, the first rib and the second rib are provided on the same surface of the bottom wall, and the second rib has a convex portion that is long in the circumferential direction and spaced apart in the circumferential direction. Since the plurality of protrusions are arranged and each convex portion intersects the first rib, the first rib makes it difficult for the bottom wall to bend from the front surface to the back surface side or vice versa along the longitudinal direction of the first rib. In addition, the second rib can reinforce the bottom wall so that it is difficult to bend along the circumferential direction intersecting the longitudinal direction of the first rib from the front surface to the back surface side or vice versa. The container can be made difficult to be deformed by an external force applied to the bottom wall.

  In the container of the present invention, each convex portion is provided so as to connect the midway positions in the longitudinal direction of at least two first ribs in the circumferential direction, and the circumferential length of each convex portion is convex. It can also be configured to be longer than the interval in the circumferential direction between the parts.

  According to the container having such a configuration, the second rib can reinforce the bottom wall so that it is very difficult to bend from the front surface to the back surface side or vice versa along the circumferential direction intersecting the longitudinal direction of the first rib. The container can be made difficult to be deformed by an external force applied to the bottom wall such as the gravity of the contents.

  In the container of the present invention, the first rib and the second rib are provided on the same surface of the bottom wall, and the second rib has a plurality of convex protrusions that are long in the circumferential direction and spaced apart in the circumferential direction. Since each convex part intersects the first rib, the bottom wall is reinforced by the first rib so that it is difficult to bend along the longitudinal direction of the first rib from the front surface to the back surface side or vice versa. In addition, the second rib can reinforce the bottom wall so that it is difficult to bend along the circumferential direction intersecting the longitudinal direction of the first rib from the front surface to the back surface side or vice versa. It is possible to make it difficult for the container to be deformed by an external force applied to the container.

The perspective view of the container concerning this embodiment is shown. The top view of the container is shown. The bottom view of the container is shown. One side view of the container is shown.

  Hereinafter, an embodiment of a container according to the present invention will be described with reference to FIGS. 1 to 4 by taking a tofu container as an example.

  The container 1 of the present embodiment is obtained by applying a three-dimensional shape to a thermoplastic resin sheet by thermoforming such as vacuum forming or pressure forming. Specifically, the container 1 has an accommodation recess 10 having a rectangular opening at the top, and the accommodation recess 10 is sealed with a resin film in a state where tofu is accommodated together with water as an object to be accommodated. .

  As shown in FIGS. 1 and 2, the container 1 of the present embodiment includes an accommodation recess 10 that constitutes the tofu accommodation space, and a flange portion that extends substantially horizontally outward from the opening edge 10 a of the accommodation recess 10. 20.

  The accommodating recess 10 has a concave shape with an opening on the top surface, and is slightly outwardly inclined from the bottom wall 11 having a rectangular shape in plan view that is slightly larger than the contour shape in plan view of tofu and the outer peripheral edge of the bottom wall 11. It has a rectangular frame-shaped side wall 12 rising in the state.

  The bottom wall 11 has a front surface 11U on which the objects to be stored (tofu and water) are placed, and a back surface 11L that is a surface opposite to the front surface 11U. On the surface 11U of the bottom wall 11, as shown in FIG. 2, a plurality of long first ribs 13 are provided so as to extend from the central region (region including the central portion and its vicinity) to the outer peripheral edge. The second rib 14 is provided so as to protrude along the circumferential direction of the bottom wall 11 so as to surround the central region at a position between the central region and the outer peripheral edge. In addition, since the container 1 is formed by thermoforming a thermoplastic resin sheet, the protrusion on the front surface side of the bottom wall 11 means the recess on the back surface side, that is, the front surface 11U and the back surface 11L are concave. It is a surface which makes mutually opposite about installation and convex arrangement (refer to Drawings 2 and 3).

  The plurality of first ribs 13 are provided from the central region to each side of the rectangular outer peripheral edge. Each of the first ribs 13 has a linear shape in a plan view, and has a convex U shape on the surface 11U side in an inverted U-shaped cross section. Each of the first ribs 13 protrudes into a convex shape on the front surface 11U side and is recessed into a concave shape on the back surface 11L side. The first ribs 13 are arranged so as to be spaced apart from each other at a predetermined interval (in the present embodiment, at equal intervals) in a circumferential direction (or a short direction) intersecting the longitudinal direction. A region where the first ribs 13 are separated from each other is a groove. That is, the groove is recessed to form a concave shape on the front surface 11U side, and is convex to form a convex shape on the back surface 11L side.

  The second rib 14 is formed by arranging a plurality of convex protrusions that are long in the circumferential direction so as to be spaced apart in the circumferential direction, and each convex part is the first rib 13 (in the longitudinal direction of the first rib 13). Position). Moreover, each convex part is provided so that the longitudinal direction middle positions of the at least 2 1st rib 13 may be connected to the circumferential direction, and the circumferential direction length of each convex part is the circumferential direction of convex parts. It is comprised so that it may become longer than this space | interval. Such second ribs 14 can be configured to cross all or part of the first ribs 13 in the longitudinal direction, and the second ribs 14 of the present embodiment can be configured such that the lengths of all the first ribs 13 are the same. Crosses in the middle of the direction (see FIG. 2).

  Each convex part of this embodiment is spaced apart from each other along the outer peripheral edge (or circumferential direction) at a position closer to the center side than the rectangular outer peripheral edge. Specifically, each convex portion is provided at each of four corners and four side center portions of a rectangle smaller than the shape of the outer peripheral edge, and the respective convex portions are spaced apart from each other in the circumferential direction. The convex portions 14a provided corresponding to the four corner portions have a substantially L shape in plan view, and connect the midway positions in the longitudinal direction of the ten first ribs 13 in the circumferential direction. Provided (see FIG. 2). Moreover, the convex part 14b provided corresponding to the said 4 side center part has comprised the linear form by planar view, and connects the longitudinal direction middle positions of the five 1st ribs 13 to the circumferential direction. (See FIG. 2). Further, the spacing width (distance) between the convex portions is the same as or substantially the same as the circumferential spacing width between the first ribs 13 (or the groove width between the two first ribs), and the circumferential direction of each convex portion. Short compared to the length of. Further, each convex portion is convex to form a convex shape on the front surface 11U side, and is concave to form a concave shape on the rear surface 11L side. The height of each convex portion that protrudes into the surface 11U side is higher than the height that protrudes into the surface 11U side of the first rib 13.

  The first rib 13 of the bottom wall 11 extends to the side wall 12 beyond the outer peripheral edge. The first rib 13 on the side wall 12 extends along the height direction of the side wall 12 in a state of projecting inward from the opening edge 10a, and has a predetermined interval (equal interval) in the circumferential direction. A plurality of them are provided (see FIGS. 1 and 4).

  In the container 1 having the above configuration, the tofu is accommodated together with water in the accommodating recess 10. After the accommodation, the tofu is sealed by adhering the resin film so as to surround the accommodation recess 10 along the upper surface side of the flange portion 20 and closing the upper surface opening of the accommodation recess 10.

  Here, when the tofu is accommodated together with water in the accommodating recess 10, the bottom wall 11 is subjected to gravity due to the tofu and water. A plurality of first ribs 13 and second ribs 14 are provided on the bottom wall 11, and the plurality of first ribs 13 are provided on the bottom wall 11 along the longitudinal direction of the first rib 13 from the front surface 11 </ b> U to the back surface. The second rib 14 is reinforced to make it difficult to bend on the 11L side or the opposite direction, and the second rib 14 extends from the front surface 11U to the back surface 11L side or the opposite direction along the circumferential direction intersecting the longitudinal direction of the first rib 13. Reinforced to make it difficult to bend. Therefore, the container 1 is difficult to be deformed in a state where the bottom wall 11 is subjected to gravity due to tofu and water.

  As mentioned above, according to the container 1 which concerns on this embodiment, it is the container 1 by which a thermoplastic resin sheet is thermoformed, Comprising: On the surface 11U for mounting a to-be-contained object, and the surface on the opposite side of this surface 11U A bottom wall 11 having a certain back surface 11L, a frame-like side wall 12 standing from the outer peripheral edge of the bottom wall 11, and a central region of the surface 11U of the bottom wall 11 projecting from the outer peripheral edge side. A long first rib 13, a plurality of first ribs 13 spaced apart in the circumferential direction of the bottom wall 11, a central region of the surface 11 </ b> U on which the first rib 13 is provided, and an outer peripheral edge And a second rib 14 that protrudes along the circumferential direction so as to surround the central region, and the second rib 14 has a convex portion that is long in the circumferential direction. A plurality of the first ribs 13 intersect with each other in a circumferentially spaced manner. And features.

  According to the container 1 having such a configuration, the first rib 13 and the second rib 14 are provided on the same surface 11U of the bottom wall 11, and the second rib 14 has a convex portion that is long in the circumferential direction. Since a plurality of protrusions are arranged apart from each other in the circumferential direction, and each convex portion intersects the first rib 13, the first rib 13 causes the bottom wall 11 to extend along the longitudinal direction of the first rib 13 to the surface 11U. From the front surface 11U to the back surface 11L side along the circumferential direction intersecting the longitudinal direction of the first rib 13 by the second rib 14 or from the back surface 11L side or the reverse direction thereof. Since it can be reinforced to make it difficult to bend in the opposite direction, the container 1 can be made difficult to be deformed by an external force applied to the bottom wall 11 such as the gravity of the object.

  Moreover, in the container 1 which concerns on this embodiment, each convex part is provided so that the longitudinal direction middle positions of the at least 2 1st rib 13 may be connected to the circumferential direction, and the length of the circumferential direction of each convex part is provided. The length is configured to be longer than the interval between the convex portions in the circumferential direction.

  According to the container 1 having such a configuration, the second rib 14 makes the bottom wall 11 very difficult to bend along the circumferential direction intersecting with the longitudinal direction of the first rib 13 from the front surface 11U to the back surface 11L side or vice versa. Therefore, it is possible to make it difficult for the container 1 to be deformed by an external force applied to the bottom wall 11 such as the gravity of the object.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  Although the container 1 of this embodiment demonstrated the case where it was comprised as a container for tofu, it is not restricted to this, The container 1 can also be comprised as containers for other foodstuffs, such as konjac.

  Further, the thermoplastic resin sheet forming the container 1 of the present embodiment and the resin film used for sealing the container are not particularly limited, and white and black thermoplastic resin sheets excellent in shape retention, and It is possible to employ a transparent resin film in which the internal cut tofu is visible.

  For example, as the thermoplastic resin sheet for forming the container 1 of the present embodiment, a polyester resin sheet such as a polyethylene terephthalate resin sheet, a polybutylene terephthalate sheet, a polylactic acid resin sheet; a polyethylene resin sheet, a polypropylene resin sheet, Polyolefin resin sheets such as ethylene-vinyl acetate copolymer resin sheets; polystyrene resin sheets such as polystyrene resin sheets and high impact polystyrene resin sheets; PA6 (ε-caprolactam ring-opening polymer) sheets; PA66 (adipic acid and hexa Copolycondensation polymer with methylenediamine) sheet, polyamide resin sheet such as aromatic polyamide resin sheet, resin sheet such as polyvinyl chloride resin sheet, polycarbonate resin sheet and two or more kinds of resin Laminated sheet the sheet is stacked, such as the resin sheet and the laminated sheet and the sheet and the resin sheet other than the resin sheet such as a nonwoven fabric are stacked can be employed.

  In addition, as a thermoplastic resin sheet used for formation of the container 1, a polyolefin resin sheet is suitable, and a polypropylene resin sheet is particularly preferable.

  Further, in the present embodiment, the case where the bottom wall 11 has a rectangular shape in plan view has been described. However, the present invention is not limited thereto, and the bottom wall 11 is configured to have a circular shape or a polygonal shape (excluding a rectangular shape) in plan view. It is also possible.

  Moreover, although this embodiment demonstrated the case where the some 1st rib 13 and the 2nd rib 14 were protrudingly provided by the surface 11U of the bottom wall 11, not only this but the some 1st rib 13 and The second ribs 14 can be projected on the back surface 11 </ b> L of the bottom wall 11.

  In the present embodiment, each convex portion of the second rib 14 has been described as having a substantially L shape or a linear shape in plan view. However, the present invention is not limited thereto, and each convex portion has an arc shape in plan view. None, the second rib 14 may be configured such that a plurality of convex portions are spaced apart in the circumferential direction so as to be circular in plan view.

  Moreover, although this embodiment demonstrated each convex part of the 2nd rib 14 provided so that the longitudinal direction middle positions of five or 10 1st ribs might be connected in the circumferential direction, Not only, but each convex part of the 2nd rib 14 is provided so that the middle direction of the longitudinal direction of one 1st rib 13 may intersect (or cross) in the peripheral direction, or two or more (5 or 10 pieces). It is also possible to provide the intermediate positions in the longitudinal direction of the first ribs 13 in the circumferential direction.

  DESCRIPTION OF SYMBOLS 1 ... Container, 10 ... Housing recessed part, 10a ... Opening edge, 11 ... Bottom wall, 11L ... Back surface, 11U ... Front surface, 12 ... Side wall, 13 ... No. One rib, 14 ... second rib, 14a, 14b ... convex portion of the second rib, 20 ... flange portion

Claims (2)

A container in which a thermoplastic resin sheet is thermoformed,
A bottom wall having a front surface for placing an object to be accommodated and a back surface opposite to the surface;
A frame-like side wall erected from the outer peripheral edge of the bottom wall;
A long first rib projecting from the central region of any one surface of the bottom wall to the outer peripheral edge side, and a plurality of first ribs spaced apart in the circumferential direction of the bottom wall When,
A second rib projecting along the circumferential direction so as to surround the central region at a position between the central region and the outer peripheral edge of the one surface on which the first rib is provided;
The second rib includes a plurality of convex protrusions that are long in the circumferential direction and are spaced apart from each other in the circumferential direction, and each convex section intersects the first rib. .   Each convex portion is provided so as to connect the midway positions in the longitudinal direction of at least two first ribs in the circumferential direction, and the circumferential length of each convex portion is larger than the circumferential interval between the convex portions. 2. The container according to claim 1, wherein the container is long.

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