JP7590782B2 - Plastic containers - Google Patents

Description

The present invention relates to a plastic container.

Patent Document 1 describes a plastic container (referred to in the document as a heat-sealed container) manufactured by compressed air forming or vacuum forming, which comprises a box-shaped container body (referred to in the document as a multi-layer container body) with an open upper end, a flange portion that protrudes outward from the upper end of the container body, and a film lid (referred to in the document as a lid body) that is joined to the flange portion to cover the opening at the upper end of the container body, with one of the four corners of the flange portion forming a gripping portion (referred to in the document as a tab portion).
In the plastic container described in Patent Document 1, when peeling the film lid from the flange portion, the user pinches the gripping portion with the fingers of one hand while pinching the tab portion of the film lid with the fingers of the other hand and pulls it off from the flange portion.

JP 2015-227174 A

However, according to the inventor's investigations, there is room for improvement in the structure of the plastic container in Patent Document 1 that balances the ease of gripping the container body with ease of manufacture.

The present invention was made in consideration of the above problems, and provides a plastic container with a structure that allows the container body to be both easy to hold and easy to manufacture.

According to the present invention, there is provided a plastic container manufactured by pressure forming or vacuum forming,
A box-shaped container body having an open top;
A flange portion extending from the upper end of the container body to the outer periphery;
a film lid that is joined to the flange portion to close an opening at an upper end of the container body;
Equipped with
The flange portion has a main surface portion that protrudes from the opening of the container body to an outer periphery,
The film lid is joined to the upper surface of the main surface portion,
One or more circumferential points of the flange portion constitute a knob portion,
the knob portion is inclined downward and locally protrudes outward in a horizontal direction from the main surface portion ,
The inclination angle of the knob is 10 degrees or more and 45 degrees or less,
Each portion of the edge of the gripping portion is bent toward an inner portion of the gripping portion,
If a normal direction of a vertical plane in contact with the bent portion is defined as a first normal direction,
the bent portion is bent with respect to the inner portion in a direction such that a ratio of a component of the first normal direction in a normal direction of the bent portion is smaller than a ratio of a component of the first normal direction in a normal direction of the inner portion,
The bent portion includes a sloped portion that slopes downward toward the tip of the grip portion.
According to the present invention, there is also provided a plastic container manufactured by pressure forming or vacuum forming, comprising:
A box-shaped container body having an open top;
A flange portion extending from the upper end of the container body to the outer periphery;
a film lid that is joined to the flange portion to close an opening at an upper end of the container body;
Equipped with
One or more circumferential points of the flange portion constitute a knob portion,
The gripping portion is inclined downwardly and outwardly at an inclination angle of 10 degrees or more and 45 degrees or less,
The film cover covers the knob portion,
Each portion of the edge of the gripping portion is bent toward an inner portion of the gripping portion,
If a normal direction of a vertical plane in contact with the bent portion is defined as a first normal direction,
the bent portion is bent with respect to the inner portion in a direction such that a ratio of a component of the first normal direction in a normal direction of the bent portion is smaller than a ratio of a component of the first normal direction in a normal direction of the inner portion,
The lower surface of the inner portion is formed into a concave curved shape,
The gripping portion is inclined downward in a stepped manner toward the tip of the gripping portion,
The gripping portion has an inclined portion that is inclined downward toward the tip and a horizontal portion that is horizontally disposed, and the inclined portion is arranged alternately toward the tip,
A plastic container is provided in which the edge of the bevel is the bent portion.

The present invention makes it possible to achieve both ease of gripping the container body and ease of manufacturing.

FIG. 1 is a perspective view of a plastic container according to a first embodiment. FIG. 1 is a plan view of a plastic container according to a first embodiment. FIG. 2 is a side view of the plastic container according to the first embodiment. 4A is a plan view showing the grip portion and its surrounding structure in the first embodiment, and FIG. 4B is a cross-sectional view taken along line AA in FIG. 4(a) is a cross-sectional view taken along line BB shown in FIG. 4(a) is a cross-sectional view taken along line CC shown in FIG. FIG. 2 is a plan view showing the grip portion and its surrounding structure in the first embodiment, illustrating the regions of the first edge portion and the second edge portion. FIG. 2 is a perspective view showing a grip portion and its surrounding structure in the first embodiment. 5 is a schematic diagram for explaining an example of an operation when peeling off a film lid of a plastic container in accordance with the first embodiment from a flange portion. FIG. 10A to 10C are schematic diagrams for explaining an example of an operation when trimming a margin of a container body in the first embodiment. Figures 11(a), 11(b), and 11(c) are diagrams showing the grip portion and its surrounding structure in the second embodiment, where Figure 11(a) is an oblique view, Figure 11(b) is a plan view, and Figure 11(c) is a cross-sectional view taken along line A-A in Figure 11(b). Figures 12(a), 12(b), and 12(c) are diagrams showing the grip portion and its surrounding structure in the third embodiment, where Figure 12(a) is an oblique view, Figure 12(b) is a plan view, and Figure 12(c) is a cross-sectional view taken along line A-A in Figure 12(b). Figures 13(a), 13(b), and 13(c) are diagrams showing the gripping portion and its surrounding structure in variant example 1 of the third embodiment, where Figure 13(a) is an oblique view, Figure 13(b) is a plan view, and Figure 13(c) is a cross-sectional view taken along line A-A in Figure 13(b). Figures 14(a), 14(b), and 14(c) are diagrams showing the gripping portion and its surrounding structure in variant example 2 of the third embodiment, where Figure 14(a) is an oblique view, Figure 14(b) is a plan view, and Figure 14(c) is a cross-sectional view taken along line A-A in Figure 14(b). FIG. 13 is a plan view of a plastic container according to a fourth embodiment. 16(a) and 16(b) are diagrams showing a knob portion and its surrounding structure in the fourth embodiment, where FIG. 16(a) is a perspective view and FIG. 16(b) is a cross-sectional view taken along line AA in FIG.

Each embodiment of the present invention will be described below with reference to Figs. 1 to 16(b). Note that in all drawings, similar components are given the same reference numerals and descriptions will be omitted where appropriate.

First Embodiment
First, the first embodiment will be described with reference to Figs. 1 to 10. Figs. 3, 4(b), 5, 6, 8, and 10 show the container body 10 before the film lid 50 is joined. Figs. 2, 4(a), and 7 omit the film lid 50. Fig. 4(b) shows the state in which the knob 70 is bent and made horizontal by a two-dot chain line 220. Fig. 9 shows the plastic container 100 in a cross section taken along a line corresponding to the line A-A shown in Fig. 2. Fig. 10 shows the container body 10 in a cross section taken along a line corresponding to the line B-B shown in Fig. 4(a). Fig. 5 shows the position of the vertical surface 121 by a two-dot chain line, and Fig. 6 shows the position of the vertical surface 122 by a two-dot chain line.

The plastic container 100 according to this embodiment is a plastic container manufactured by pressure forming or vacuum forming.
As shown in FIGS. 1 to 9, a plastic container 100 comprises a box-shaped container body 10 that is open at the top, and a flange portion 12 that protrudes from the top end of the container body 10 to the outer periphery.
One or more circumferential locations of the flange portion 12 form a knob portion 70 .
The gripping portion 70 is inclined downwardly and outwardly at an inclination angle of 10 degrees or more and 45 degrees or less, and the film cover 50 covers the gripping portion 70.
Each portion (in the present embodiment, an inclined upright portion 87 described later) of edge portion 70a of gripping portion 70 is bent toward inner portion 73 of gripping portion 70 relative to that portion. If the normal direction of a vertical surface (in the present embodiment, vertical surface 121 (see FIG. 5), vertical surface 122 (see FIG. 6)) that contacts the bent portion is defined as a first normal direction, the bent portion is bent toward inner portion 73 in a direction such that the proportion of the first normal component in the normal direction of the bent portion is smaller than the proportion of the first normal component in the normal direction of inner portion 73.
In addition, the term "outward" here means the direction opposite to the center side (inward) of the plastic container 100 in the horizontal direction. In other words, the knob portion 70 is inclined downward toward the outside in the horizontal direction.
Moreover, the term "vertical surface tangent to the bent portion" used herein means a vertical surface that is tangent to the bent portion in a plan view.
In addition, the phrase "film lid 50 covers knob portion 70" means that, in a plan view, film lid 50 overlaps at least a portion of knob portion 70. As described later, in this embodiment, film lid 50 is not joined to knob portion 70.
As described later, the container body 10 is formed from a single resin sheet 400, and each portion of the container body 10 is in the form of a thin plate. Therefore, the bent portion is in the form of a thin plate, and the normal direction of the bent portion is the normal direction of this plate surface.
Here, the “normal direction of the bent portion” refers to the average normal direction of the entire bent portion, and the “normal direction of the inner portion 73” refers to the average normal direction of the entire inner portion 73.

After being filled with the contents, the plastic container 100 is distributed in a state in which the film lid 50 covers the opening 13 at the upper end of the container body 10. Then, by peeling the film lid 50 off the flange portion 12, the plastic container 100 can be opened and the contents can be removed.
As shown in Figure 9, when peeling the film lid 50 from the flange portion 12, the user pinches the gripping portion 70 with the fingers of one hand while pinching, for example, a corner of the film lid 50 that corresponds to the gripping portion 70 (film lid corner portion 51) with the fingers of the other hand and pulls it in a direction that includes a horizontal component, thereby peeling the film lid 50 off the flange portion 12.

In addition, when manufacturing the plastic container 100, as shown in Fig. 10, a resin sheet 400 is shaped into the shape of a mold (not shown) by pressure forming or vacuum forming, and then a trimming process is performed in which a margin 450 of the shaped resin sheet 400 other than the portion that will become the container body 10 is cut off by a pair of shear blades 410, 411. As a result, the container body 10 shown in Fig. 1 etc. is obtained.
In the trimming process, a pair of shear blades 410, 411 are pressed vertically against the resin sheet 400 to shear off the margin 450. Therefore, the cut surface of the container body 10 (and thus the outer edge 100a of the plastic container 100) becomes a vertical surface along the shear blades 410, 411.
As an example, in the process of forming the resin sheet 400 into the shape of a mold, 36 container bodies 10 are formed from one resin sheet 400. Then, in the trimming process, the margins 450 are sheared off from each of the container bodies 10 in groups of six.

According to this embodiment, the plastic container 100 has a gripping portion 70 that is inclined downward outward at an inclination angle of 10 degrees or more and 45 degrees or less. The normal direction of the inner portion 73 of the gripping portion 70 has a larger proportion of components in the first normal direction of the vertical surfaces 121, 122 than each portion (bent portion) of the edge portion 70a of the gripping portion 70. In other words, the normal direction of the inner portion 73 of the gripping portion 70 includes a component in a direction different from the normal direction of each portion (same as above) of the edge portion 70a of the gripping portion 70.
According to this configuration, the inner portion 73 of the gripping portion 70 can be more stably gripped by the fingers 300. Furthermore, when the film lid 50 is peeled off in a direction including a horizontal component, gripping the gripping portion 70 with the fingers 300 generates a resistance force in the direction opposite to the peeling direction. Therefore, the container body 10 can be effectively prevented from moving together with the film lid 50.
Furthermore, the proportion of the first normal direction component in the normal direction of each portion (bend) in edge 70 a of gripping portion 70 is smaller than the proportion of the first normal direction component in the normal direction of inner portion 73 .
As a result, in the above-mentioned trimming step, when the margin 450 of the resin sheet 400 is sheared, the plate surfaces of the boundaries between the margin 450 and each part at the edge 70a of the gripping portion 70 can be made to strike the shear blades 410, 411 not parallel but crosswise, so that the surrounding margin 450 can be more easily sheared from the gripping portion 70. Note that the plate surfaces of the boundaries between the margin 450 and each part at the edge 70a of the gripping portion 70 preferably strike the shear blades 410, 411 at an inclination angle of, for example, 45 degrees or more and 135 degrees or less, and more preferably strike perpendicularly (at an inclination angle of 90 degrees) as described later.
In this way, according to this embodiment, it is possible to achieve both ease of gripping the container body 10 and ease of manufacturing.

The plastic container 100 will now be described in more detail.
In the following, when describing the positional relationship between the components of the plastic container 100, the upper side in Fig. 3 will be referred to as the upper side or upper side, and the opposite side will be referred to as the lower side or lower side, etc. However, these directional definitions are for convenience only and do not limit the directions during manufacture or use of the plastic container 100.
2 is referred to as the X direction, and the left-right direction in FIG. 2 is referred to as the Y direction. The X direction and the Y direction are horizontal directions and perpendicular to the depth direction of the plastic container 100. The direction perpendicular to both the X direction and the Y direction is referred to as the Z direction. The Z direction is a vertical direction and parallel to the depth direction of the plastic container 100. In the horizontal direction, the center side of the plastic container 100 is referred to as the inner side, and the side opposite the inner side is referred to as the outer side.

As shown in Figs. 2 and 3, in this embodiment, the plastic container 100 has a generally flat (shallow depth) box shape. The planar shape of the plastic container 100 is not particularly limited, but may be, for example, a rectangular shape with rounded corners. More specifically, the planar shape of the plastic container 100 is substantially rectangular, and includes a pair of parallel long sides and a pair of parallel short sides. An arc-shaped curve is disposed between the long side and the short side, thereby forming a rounded corner 15. However, for example, the long side and the short side may intersect at a right angle to form the right-angled corner 15. The plastic container 100 is formed in a rotationally symmetric shape with the center of the plastic container 100 as a reference. Note that Figs. 2 and 3 show the right half of the plastic container 100 with the center as a reference, and the left half is omitted.
Further, the outer edge 100a of the plastic container 100 in a plan view includes, for example, a first edge 111 and a second edge 112 that sandwich the tip 71 (corner) of the gripping portion 70 and intersect with each other.
The first edge 111 is, for example, a short side of the approximately rectangular plastic container 100, and the second edge 112 is, for example, a long side of the approximately rectangular plastic container 100.
In this embodiment, the extension direction of the first edge 111 is the extension direction of the straight portion of the first edge 111 excluding the rounded portion of the corner 15. Similarly, the extension direction of the second edge 112 is the extension direction of the straight portion of the second edge 112 excluding the rounded portion of the corner 15.
More specifically, the first edge 111 extends, for example, in the X direction, and the second edge 112 extends, for example, in the Y direction.
In the present invention, the planar shape of the plastic container 100 is not limited to a substantially rectangular shape, and may be, for example, another polygonal shape such as a square shape. Furthermore, the planar shape of the plastic container 100 may be, for example, a shape including an arc-shaped side that is convex inward or outward, or may be a perfect circle or an ellipse (described in detail later).

In this embodiment, the knob portion 70 is contained within a rectangle 210 that circumscribes the flange portion 12 in a plan view.
More specifically, the entirety of the gripping portion 70 is, for example, in a plan view, contained within a rectangle 210 (see FIG. 2) including the above-mentioned four sides (a pair of long sides and a pair of short sides) of the plastic container 100. The width dimension (dimension in the Y direction) of the rectangle 210 is equal to the width dimension (dimension in the Y direction) of the plastic container 100, and the length dimension (dimension in the X direction) of the rectangle 210 is equal to the length dimension (dimension in the X direction) of the plastic container 100. Here, "contained within" may mean that the outline of the gripping portion 70 (or a part thereof) and the outline of the rectangle 210 coincide with each other, or the outline of the gripping portion 70 may be located inside the outline of the rectangle 210.
On the other hand, as shown in Fig. 4(b), when gripping portion 70 is bent and horizontal, tip 71 of gripping portion 70 protrudes outward beyond corner 211 of rectangle 210. In Fig. 4(b), the position of corner 211 of rectangle 210 is shown by a two-dot chain line.
More specifically, when the central axis of the gripping portion 70 is bent so as to approach the horizontal direction more than in its natural state, the tip 71 of the gripping portion 70 protrudes outward beyond the corners 211 of the rectangle 210 .
In addition, in the case of this embodiment, in at least one of the states before or after the film lid 50 is joined to the flange portion 12, it is preferable that the gripping portion 70 is contained within the rectangle 210 in a planar view, and that when bent and horizontal, it protrudes outward from the rectangle 210; more preferably, in both the state before or after the film lid 50 is joined to the flange portion 12, the gripping portion 70 satisfies these two conditions.

The container body 10 has a planar shape, for example, a rectangular shape with rounded corners. More specifically, the container body 10 has a planar shape that is substantially rectangular.
As shown in FIG. 1 , the container body 10 includes a body portion 11 that is open at the top end, and a bottom portion 14 that closes the bottom end of the body portion 11 .
The planar shape of the body portion 11 is a generally octagonal shape that is elongated in a direction parallel to the long sides of the plastic container 100 .
As shown in Fig. 3, in the body 11, the portion below the upper end 16 (hereinafter, the body main body 11a) is inclined in two steps so that the planar dimensions slightly increase upward. A step 17 is formed between the upper edge of the body main body 11a in the body 11 and the lower edge of the upper end 16. The step 17 is a substantially rectangular annular portion that protrudes radially outward from the upper edge of the body main body 11a in a flange-like manner, and the outer periphery of the step 17 is connected to the lower edge of the upper end 16. In other words, the step 17 protrudes radially inward from the lower edge of the upper end 16 in an inner flange-like manner.

As shown in FIG. 2, a portion of the step 17 located near the corner 15 forms a wide portion 17a that is wider than the other portions of the step 17.
Furthermore, the center of the portion of the side wall of the container body 10 (the side wall of the trunk portion 11) that corresponds to the long side of the substantially rectangular container body 10 is offset toward the inside of the plastic container 100 from both ends of the portion that corresponds to the long side. Therefore, a step is formed between the center and both ends of the portion that corresponds to the long side of the substantially rectangular container body 10.

The shape of the bottom surface portion 14 is not particularly limited, but in this embodiment, the height position of a central portion 14a of the bottom surface portion 14 is higher than the height position of a peripheral portion 14b of the bottom surface portion 14.
The planar shape of the central portion 14a is, for example, a substantially octagonal shape that is elongated in a direction parallel to the long sides of the plastic container 100. However, in the present invention, the planar shape of the central portion 14a may be a rectangular shape, an elliptical shape, or an oval shape.
Further, the central portion 14a is formed with, for example, a plurality of concave-convex shapes 20. However, in the present invention, the shape of the plurality of concave-convex shapes 20 is not limited to the shape shown in Figs.

1 , the flange portion 12 protrudes outward in a 360-degree circular manner from the upper end of the container body 10. The flange portion 12 is formed in a generally rectangular ring shape with rounded corners in a plan view, and has four corners 15.
More specifically, the flange portion 12 includes, for example, a main surface portion 12a that protrudes outward from the opening 13 at the upper end of the container body 10, and a flange portion step portion 12b that is displaced downward in a stepped manner radially outward from the main surface portion 12a.
The main surface portion 12a is formed, for example, to be substantially flat. The joint portion 55 between the film lid 50 and the flange portion 12 is formed, for example, over substantially the entire upper surface of the main surface portion 12a. That is, the film lid 50 is joined to the upper surface of the main surface portion 12a.
As shown in Fig. 9, when the film lid 50 is joined, the main surface portion 12a extends substantially horizontally, for example, due to the tension of the film lid 50. On the other hand, as shown in Fig. 4(b), when the film lid 50 is not joined, the main surface portion 12a is, for example, slightly inclined radially outward.
The film lid 50 is joined to the upper surface of the main surface portion 12a by, for example, heat sealing. However, the film lid 50 may also be joined to the upper surface of the main surface portion 12a by, for example, an adhesive.
In addition, in FIG. 2 and FIG. 4A, the region where the joint portion 55 is formed is indicated by hatching slanting upward to the left.

Here, in the case of the present embodiment, as an example, one or more of the corners 15 of the flange portion 12 constitute the gripping portion 70. That is, two or more corners in the circumferential direction of the flange portion 12 constitute the gripping portion 70. More specifically, for example, of the four corners 15 of the flange portion 12, the corner 15 on the left rear side in FIG. 2 and the corner 15 diagonally opposite to the corner 15 constitute the gripping portion 70. The two gripping portions 70 are formed, for example, in a rotationally symmetrical shape with respect to each other with the center of the plastic container 100 as a reference.
However, in the present invention, the number of gripping portions 70 that the plastic container 100 has is not particularly limited, and there may be one gripping portion 70 at one location in the circumferential direction of the flange portion 12, or there may be three gripping portions 70. Furthermore, when the plastic container 100 has multiple gripping portions 70, the multiple gripping portions 70 may be formed in different shapes from each other.

For example, the knob portion 70 is inclined downward from the outer peripheral edge of the flange portion step portion 12b toward the outside. As shown in Fig. 4(a) , the boundary between the knob portion 70 and the inner peripheral edge of the flange portion step portion 12b is narrower than the other portions of the flange portion step portion 12b.
More specifically, as shown in Figures 2 and 4 (b), in this embodiment, the knob portion 70 is inclined downward toward the outside in a direction that bisects the tip 71 (corner) of the knob portion 70 when viewed in a plan view.
4(a), 4(b) and 8, the gripping portion 70 has, toward the tip, alternating inclined portions (in the present embodiment, an inclined curved portion 81 and an inclined upright portion 87 described later) that slope downward toward the tip 71 and horizontal portions 86 that are arranged horizontally. More specifically, the horizontal portions 86 and the inclined curved portions 81 are arranged alternately one by one toward the outside and downward, and as a result, the gripping portion 70 is formed into a shape that slopes downward in a stepped manner toward the outside.
Each of the inclined curved portions 81 is formed in a curved shape that is convex outward and is inclined downward outward. In a plan view, each of the inclined curved portions 81 is formed in a substantially arc shape that extends in a direction along a corner of the main surface portion 12a. The lower surfaces (inner peripheral surfaces) of the inclined curved portions 81 form the lower surface 73a of the inner portion 73 of the gripping portion 70 into a concave curved shape that corresponds to the finger 300.
Each of the horizontal portions 86 is formed in a flat plate shape, and the surface direction thereof is mainly the horizontal direction.
As an example, the gripping portion 70 includes a first inclined curved portion 81a, a second inclined curved portion 81b, and a third inclined curved portion 81c as the multiple inclined curved portions 81, which are arranged in this order from the inside and from above.
Similarly, the knob portion 70 includes, as an example, a first horizontal portion 86b, a second horizontal portion 86c, and a third horizontal portion 86d as a plurality of horizontal portions 86, which are arranged in this order from the inside and from above.
The inner peripheral edge of the first inclined curved portion 81a (the edge toward the center of the container body 10) is connected to the outer peripheral edge of the flange portion step portion 12b, and the outer peripheral edge of the first inclined curved portion 81a (the edge opposite the center of the container body 10) is connected to the inner peripheral edge of the first horizontal portion 86b (the edge toward the center of the container body 10).
The inner peripheral edge (same as above) of the second inclined curved portion 81b is connected to the outer peripheral edge (the edge opposite the center side of the container body 10) of the first horizontal portion 86b, and the outer peripheral edge (same as above) of the second inclined curved portion 81b is connected to the inner peripheral edge (same as above) of the second horizontal portion 86c.
The inner peripheral edge (same as above) of the third inclined curved portion 81c is connected to the outer peripheral edge (same as above) of the second horizontal portion 86c, and the outer peripheral edge (same as above) of the third inclined curved portion 81c is connected to the inner peripheral edge (same as above) of the third horizontal portion 86d.

2 and other figures, the knob portion 70 is formed in a shape that gradually tapers toward the tip 71. In the case of this embodiment, the corner of the knob portion 70 is the tip 71 in the protruding direction of the knob portion 70.
More specifically, among the multiple inclined curved portions 81, the inclined curved portion 81 located further outward has a smaller length dimension (dimension in the extending direction). That is, the third inclined curved portion 81c has the smallest length dimension, followed by the second inclined curved portion 81b and the first inclined curved portion 81a.
Similarly, the horizontal portions 86 located further outward among the multiple horizontal portions 86 have smaller length dimensions (dimension in the extending direction) than the horizontal portions 86. That is, the third horizontal portion 86d has the smallest length dimensions, followed by the second horizontal portion 86c and the first horizontal portion 86b.
The radii of curvature of the plurality of inclined curved portions 81 are set to be equal to each other. However, in the present invention, the radii of curvature of the plurality of inclined curved portions 81 may be set to be different from each other, for example.

In this embodiment, the edge of the inclined portion is the bent portion.
More specifically, each inclined portion includes, for example, an inclined upright portion 87 that stands outward from both ends (both ends in the extending direction) of the inclined curved portion 81. Each inclined upright portion 87 is an edge portion of the inclined portion and constitutes a bent portion.
In the following description, the inclined upright portion 87 on one end side in the extension direction of the inclined curved portion 81 will be simply referred to as the inclined upright portion 87 on the one end side, and the inclined upright portion 87 on the other end side in the extension direction of the inclined curved portion 81 will be simply referred to as the inclined upright portion 87 on the other end side.
Each inclined upright portion 87 is formed in a flat plate shape that is inclined downward toward the outside.
The width of each of the inclined upright portions 87 gradually decreases (becomes gradually narrower) downward.
In this embodiment, the inclined portion of the gripping portion 70 includes, as the inclined standing portion 87, a first inclined standing portion 87a formed on both end sides of the first inclined curved portion 81a, a second inclined standing portion 87b formed on both end sides of the second inclined curved portion 81b, and a third inclined standing portion 87c formed on both end sides of the third inclined curved portion 81c.
An upper edge of each of the first inclined upright portions 87a is connected to, for example, a part of the flange portion step portion 12b of the flange portion 12. In the flange portion step portion 12b, the boundary portion with the corresponding first inclined upright portion 87a gradually becomes wider toward the first inclined upright portion 87a.
The lower end (lower edge) of the first inclined upright portion 87a on one end side is connected, for example, to one end of the inner peripheral edge of the first horizontal portion 86b, and the lower end (lower edge) of the first inclined upright portion 87a on the other end side is connected, for example, to the other end of the inner peripheral edge of the first horizontal portion 86b.
The upper edge of the second inclined standing portion 87b on one end side is connected, for example, to one end of the outer peripheral edge of the first horizontal portion 86b, and the upper edge of the second inclined standing portion 87b on the other end side is connected, for example, to the other end of the outer peripheral edge of the first horizontal portion 86b.
The lower end (lower edge) of the second inclined standing portion 87b on one end side is connected, for example, to one end of the inner peripheral edge of the second horizontal portion 86c, and the lower end (lower edge) of the second inclined standing portion 87b on the other end side is connected, for example, to the other end of the inner peripheral edge of the second horizontal portion 86c.
The upper edge of the third inclined standing portion 87c on one end side is connected, for example, to one end of the outer peripheral edge of the second horizontal portion 86c, and the upper edge of the third inclined standing portion 87c on the other end side is connected, for example, to the other end of the outer peripheral edge of the second horizontal portion 86c.
The lower end (lower edge) of the third inclined upright portion 87c on one end side is connected, for example, to one end of the inner peripheral edge of the third horizontal portion 86d, and the lower end (lower edge) of the third inclined upright portion 87c on the other end side is connected, for example, to the other end of the inner peripheral edge of the third horizontal portion 86d.
Here, the portion on one end side of the first horizontal portion 86b in the extension direction is simply referred to as one end of the first horizontal portion 86b, based on a straight line 251 (see Figure 7) connecting the intersection between the boundary line of the first inclined upright portion 87a on one end side and one end of the first inclined curved portion 81a and the inner peripheral edge of the first horizontal portion 86b, and the intersection between the boundary line of the second inclined upright portion 87b on one end side and one end of the second inclined curved portion 81b and the outer peripheral edge of the first horizontal portion 86b. In addition, the portion on the other end side of the first horizontal portion 86b in the extending direction is simply referred to as the other end of the first horizontal portion 86b based on a straight line 261 (see FIG. 7) connecting the intersection point between the boundary line of the other end of the first inclined upright portion 87a and the first inclined curved portion 81a and the inner peripheral edge of the first horizontal portion 86b and the intersection point between the boundary line of the other end of the second inclined upright portion 87b and the second inclined curved portion 81b and the outer peripheral edge of the first horizontal portion 86b. As described later, one end of the first horizontal portion 86b constitutes a part of the first edge portion 72a, and the other end of the first horizontal portion 86b constitutes a part of the second edge portion 72b.
Similarly, based on a straight line 252 (see Figure 7) connecting the intersection point between the boundary line between the second inclined upright portion 87b on one end side and one end of the second inclined curved portion 81b and the inner peripheral edge of the second horizontal portion 86c, and the intersection point between the boundary line between the third inclined upright portion 87c on one end side and one end of the third inclined curved portion 81c and the outer peripheral edge of the second horizontal portion 86c, the portion on one end side in the extension direction of the second horizontal portion 86c is simply referred to as one end of the second horizontal portion 86c. In addition, the portion on the other end side in the extending direction of the second horizontal portion 86c is simply referred to as the other end of the second horizontal portion 86c based on a straight line 262 (see FIG. 7) connecting the intersection point between the boundary line of the other end of the second inclined upright portion 87b and the second inclined curved portion 81b and the inner peripheral edge of the second horizontal portion 86c and the intersection point between the boundary line of the other end of the third inclined upright portion 87c and the third inclined curved portion 81c and the outer peripheral edge of the second horizontal portion 86c. As described later, one end of the second horizontal portion 86c constitutes a part of the first edge portion 72a, and the other end of the second horizontal portion 86c constitutes a part of the second edge portion 72b.
4A, the width dimension (dimension in the Y direction) of one end of the first horizontal portion 86b gradually increases toward the second inclined upright portion 87b on one end side, and the planar shape of the one end is substantially a right-angled triangle. The width dimension (dimension in the X direction) of the other end of the first horizontal portion 86b gradually increases toward the second inclined upright portion 87b on the other end side, and the planar shape of the other end is substantially a right-angled triangle.
Similarly, the width dimension (dimension in the Y direction) of one end of the second horizontal portion 86c gradually increases toward the third inclined upright portion 87c on one end side, and the planar shape of the one end is generally trapezoidal. The width dimension (dimension in the X direction) of the other end of the second horizontal portion 86c gradually increases toward the third inclined upright portion 87c on the other end side, and the planar shape of the other end is generally trapezoidal.
In addition, the planar shape of the third horizontal portion 86d is formed into an outwardly convex arc, and the center of the outer circumferential edge of the third horizontal portion 86d (the center in the extending direction) forms the corner (tip 71) of the gripping portion 70.

In this embodiment, the normal direction of the bent portion is perpendicular to the first normal direction (the normal direction of the vertical surfaces 121 and 122).
10, when the margin 450 of the resin sheet 400 is sheared in the above-mentioned trimming process, the plate surface of the boundary between the edge 70a of the gripping portion 70 and the margin 450 can be made to abut perpendicularly, not parallel, against the shearing blades 410 and 411. Therefore, the surrounding margin 450 can be sheared from the gripping portion 70 more easily.
However, in the present invention, it is sufficient that the normal direction of the bent portion at least intersects with the first normal direction of the corresponding vertical plane. In this case, the angle between the normal direction of the bent portion and the first normal direction of the corresponding vertical plane may be less than 90 degrees or may be greater than 90 degrees.

Here, in the edge 70a of the gripping portion 70, for example, one of the regions equally divided into two with respect to the tip 71 is designated as a first edge 72a, and the other is designated as a second edge 72b.
In this embodiment, the first edge 72a of the gripping portion 70 is composed of each inclined upright portion 87 on one end side and one end of each horizontal portion 86, and the first edge 72a is inclined downward in a stepped manner toward the tip 71 along the extension direction of the first edge 111. In a plan view, the outer edge of each inclined upright portion 87 on one end side and the outer edge of one end of each horizontal portion 86 are arranged in approximately the same straight line. However, the outer edge (outer peripheral edge) of one end of the third horizontal portion 86d has an outwardly convex arc shape.
In this embodiment, in the first edge 72a, each inclined upright portion 87 on one end side is a bent portion. In addition, in a plan view, the vertical plane 121 is a vertical plane that is a tangent to each inclined upright portion 87 (bent portion) on one end side, and is an XZ plane along the first edge 111. The proportion of the component in the first normal direction (Y direction in this embodiment) of the vertical plane 121 in the normal direction of each inclined upright portion 87 on one end side is smaller than the proportion of the component in the first normal direction (Y direction) in the normal direction of the inner portion 73.
In addition, the proportion of the component in the first normal direction (Y direction) of the vertical surface 121 in the average normal direction of the part where each inclined upright portion 87 on one end side is combined is smaller than the proportion of the component in the first normal direction in the normal direction of the inner portion 73.
More specifically, for example, the normal direction of each inclined upright portion 87 on one end side has the smallest Y-direction component among the X, Y and Z directions, and preferably the Y-direction component is substantially zero.
In this embodiment, the normal direction of each inclined standing portion 87 on one end side includes the X direction and the Z direction, and as an example, the normal direction of each inclined standing portion 87 on one end side has an X direction component of approximately 50%, a Z direction component of approximately 50%, and a Y direction component of approximately 0%.
In the present invention, the normal directions of the inclined upright portions 87 on one end side may be different from each other.
Similarly, the second edge 72b of the gripping portion 70 is composed of the inclined upright portions 87 on the other end side and the other ends of the horizontal portions 86, and the second edge 72b slopes down in a stepped manner toward the tip 71 along the extension direction of the second edge 112. In a plan view, the outer edges of the inclined upright portions 87 on the other end side and the outer edges of the other ends of the horizontal portions 86 are arranged in approximately the same straight line. However, the outer edge (outer peripheral edge) of the other end of the third horizontal portion 86d has an outwardly convex arc shape.
In this embodiment, in the second edge 72b, each inclined upright portion 87 on the other end side is a bent portion. The vertical plane 122 is a vertical plane that is tangent to each inclined upright portion 87 (bent portion) on the other end side in a plan view, and is a YZ plane along the second edge 112. Therefore, the proportion of the component in the normal direction of the vertical plane 122 (X direction in this embodiment) in the normal direction of each inclined upright portion 87 on the other end side is smaller than the proportion of the component in the first normal direction (X direction) in the normal direction of the inner portion 73.
In addition, the proportion of the component in the first normal direction (X direction) of the vertical surface 122 in the average normal direction of the portion combining the inclined upright portions 87 on the other end side is smaller than the proportion of the component in the first normal direction in the normal direction of the inner portion 73.
More specifically, for example, the average normal direction of each inclined upright portion 87 on the other end side has the smallest component in the X direction among the X, Y and Z directions, and preferably the component in the X direction is substantially zero.
More specifically, the normal direction of each inclined standing portion 87 on the other end side includes the Y direction and the Z direction, and in the case of this embodiment, as an example, the normal direction of each inclined standing portion 87 (bent portion) on the other end has a Y direction component of approximately 50%, a Z direction component of approximately 50%, and an X direction component of approximately 0%.
In the present invention, the normal directions of the inclined upright portions 87 on the other end side may be different from each other.

In addition, in the gripping portion 70 , the portion other than the first edge portion 72 a and the second edge portion 72 b is an inner portion 73 .
In the case of this embodiment, the inner portion 73 is constituted by the intermediate portions (portions excluding both end portions) of each horizontal portion 86 and each inclined curved portion 81 .
More specifically, the inner portion 73 includes a portion of the first horizontal portion 86b other than both ends (a portion included in the first edge portion 72a and a portion included in the second edge portion 72b) and a portion of the second horizontal portion 86c other than both ends (a portion included in the first edge portion 72a and a portion included in the second edge portion 72b). Note that in the third horizontal portion 86d, one of the regions equally divided into two with respect to the tip 71 is the first edge portion 72a, and the other is the second edge portion 72b.
Additionally, the inner portion 73 includes the entirety of each of the plurality of inclined curved portions 81 .
The average normal direction of the entire inner portion 73 has a larger proportion of the component in the first normal direction (Y direction) of the vertical surface 121 compared to each inclined standing portion 87 on one end side, and a larger proportion of the component in the first normal direction (X direction) of the vertical surface 122 compared to each inclined standing portion 87 on the other end side.
More specifically, the average normal direction of each inclined curved portion 81 has a larger proportion of the component in the first normal direction (Y direction) of the vertical surface 121 compared to the normal direction of the adjacent inclined standing portion 87 on one end side, and has a larger proportion of the component in the first normal direction (X direction) of the vertical surface 122 compared to the adjacent inclined standing portion 87 on the other end side.
In this embodiment, as an example, the average normal direction of each inclined curved portion 81 has a Y-direction component that is 1/3 (approximately 33%) of the total, an X-direction component that is 1/3 (approximately 33%) of the total, and a Z-direction component that is 1/3 (approximately 33%) of the total.
In addition, in the case of this embodiment, in the inner portion 73 , the total area of each of the inclined curved portions 81 is greater than the total area of each of the horizontal portions 86 .

Thus, in this embodiment, the inner portion 73 includes a plurality of inclined curved portions 81, and the lower surface 73a (see FIG. 9) of the inner portion 73 is formed into a concave curved shape corresponding to the finger 300.
This allows the fingers to fit well against the underside 73a of the inner portion 73 when gripping the grip portion 70, so that the grip portion 70 can be gripped more stably with the fingers 300.
In addition, the "concave curved surface shape corresponding to the finger 300" means a shape into which at least a part of the finger can enter. More specifically, the pad of the finger or the tip of the finger may enter into the lower surface 73a (concave curved surface) of the inner portion 73.
In addition, here, "the underside 73a of the inner portion 73 is formed into a concave curved shape corresponding to the finger 300" means that at least a part of the underside 73a of the inner portion 73 is formed into a concave curved shape corresponding to the finger 300, and it is not necessarily the case that the entire underside 73a of the inner portion 73 is formed into a concave curved shape corresponding to the finger 300.

In addition, the portions of the flange portion 12 other than the gripping portion 70 (in this embodiment, the main surface portion 12a and the flange portion step portion 12b) do not have a concave curved surface shape that corresponds to the finger 300.

As shown in FIGS. 4A, 4B and 8, the gripping portion 70 is, for example, inclined downward in a stepped manner outwardly toward a tip 71 of the gripping portion 70.
As a result, when gripping the grip portion 70, the fingers 300 are appropriately hooked onto the stepped unevenness of the grip portion 70, so that the grip portion 70 can be gripped more stably with the fingers 300.

In addition, the gripping portion 70 has alternating inclined portions (each inclined curved portion 81 and each inclined raised portion 87) that slope downward toward the tip 71 and horizontal portions 86 that are arranged horizontally toward the tip 71, and the edges of the inclined portions (each inclined raised portion 87) are bent portions.
As a result, in the above-mentioned trimming process, when shearing the margin 450 of the resin sheet 400, the plate surface at the boundary between each part at the edge 70a of the stepped gripping portion 70 and the margin 450 can be made to hit the shearing blades 410, 411 in an intersecting manner rather than parallel to them, so that the surrounding margin 450 can be more easily sheared off from the gripping portion 70.

As shown in FIG. 1 , an outer edge 55 a of a joint 55 between the film lid 50 and the flange portion 12 is located, for example, on the inner side than the knob portion 70 .
This ensures that when the film cover 50 is picked up and peeled off with the fingers 300, a sufficient area of the gripping portion 70 can be secured for the fingers 300 to grasp.
In the present embodiment, as described above, the joint 55 between the film lid 50 and the flange portion 12 is formed over substantially the entire upper surface of the main surface portion 12a. As shown in Fig. 4A, the outer edge 55a of the joint 55 is formed, for example, on the outer periphery of the upper surface of the main surface portion 12a or on the inside of the outer periphery. Therefore, the entire film lid corner portion 51 is not joined to the gripping portion 70.
However, in the present invention, it is sufficient that at least a portion of the film cover corner portion 51 is not joined to the gripping portion 70, and the outer edge 55a of the joint portion 55 may be formed on the base end of the gripping portion 70, for example.
The planar shape of the film lid 50 is formed to be substantially the same shape as the substantially rectangular container body 10. The four film lid corners 51 of the film lid 50 cover the respective corners 15 of the flange portion 12. Of the four film lid corners 51, the film lid corner 51 arranged at a position corresponding to the grip portion 70 is not joined to the grip portion 70. As described below, when peeling the film lid 50 from the flange portion 12, the film lid corner 51 corresponding to the grip portion 70 is pinched with the fingers of one hand and pulled off.

The contents of the plastic container 100 are not particularly limited, but as an example, they may be food. The contents of the plastic container 100 are not particularly limited, and may be a liquid (including a fluid) or a solid.

As described above, the inclination angle R1 (see FIG. 9 ) of the gripping portion 70 is equal to or greater than 10 degrees and equal to or less than 45 degrees. The inclination angle of the gripping portion 70 referred to here means the average inclination angle of the gripping portion 70 as a whole. The inclination angle R1 of the gripping portion 70 is the inclination angle of the gripping portion 70 with respect to a virtual line 230 extending horizontally in a cross section taken along a line (for example, line A-A shown in FIG. 2 ) that bisects the tip 71 (corner) of the gripping portion 70 in a plan view.
The radius of curvature of the outline of the tip 71 (corner) of the gripping portion 70 and its vicinity is smaller than, for example, the radius of curvature of the outline of the corner 15 that does not constitute the gripping portion 70 .
More specifically, the radius of curvature of the outline of the tip 71 (corner) of the knob 70 and its vicinity is preferably 1 mm or more and 30 mm or less, and more preferably 3 mm or more and 20 mm or less.
Moreover, the radius of curvature of the outline of the corner 15 that does not constitute the gripping portion 70 is preferably 5 mm or more and 40 mm or less, and more preferably 10 mm or more and 30 mm or less.
The vertical dimension H1 of the gripping portion 70 (see FIG. 4(b)) is preferably ⅙ to ½ of the vertical dimension of the container body 10, and more preferably ⅕ to ⅓ of the vertical dimension of the container body 10. In the case of this embodiment, as an example, the vertical dimension of the gripping portion 70 is preferably 6 mm to 15 mm, and more preferably 7 mm to 10 mm.
It is preferable that the maximum width dimension W1 (see FIG. 4A) of the gripping portion 70 corresponds to the width of an average human finger.
More specifically, the maximum width dimension W1 of the knob portion 70 is, for example, preferably 10 mm or more and 35 mm or less, and more preferably 10 mm or more and 25 mm or less.
The radius of curvature of the lower surface (inner peripheral surface) of each inclined curved portion 81 is preferably a dimension that corresponds to the curved surface of the pad of a human finger of average thickness, for example.
More specifically, the radius of curvature of the lower surface (inner peripheral surface) of each inclined curved portion 81 is, for example, preferably 5 mm or more and 40 mm or less, and more preferably 10 mm or more and 30 mm or less.
The vertical dimension of each inclined curved portion 81 is, for example, preferably 1.5 mm or more and 5 mm or less, and more preferably 2 mm or more and 3 mm or less.
The inclination angle of each inclined upright portion 87 with respect to the horizontal portion 86 is, for example, preferably greater than or equal to 1 degree and less than or equal to 45 degrees, and more preferably greater than or equal to 5 degrees and less than or equal to 30 degrees.

An example of the operation for peeling off the film lid 50 from the flange portion 12 will now be described.
When peeling off the film lid 50 from the flange portion 12, the user first grips the gripping portion 70 of the container body 10 with the fingers of one hand. In addition, the user grips the film lid corner portion 51 corresponding to the gripping portion 70 among the four film lid corner portions 51 of the film lid 50 with the fingers of the other hand.
9, for example, the thumb 310 is placed along the upper surface of the gripping portion 70, and the other fingers (for example, the index finger 320) are placed along the lower surface 73a of the inner portion 73, so that the gripping portion 70 is gripped vertically with at least two fingers. However, the positions of the thumb 310 and the index finger 320 may be interchanged. Also, the gripping portion 70 may be gripped with fingers other than the thumb 310 and the index finger 320.
Then, the gripped corner portion 51 of the film lid is pulled in a direction mainly consisting of a diagonal direction of the substantially rectangular container body 10 (for example, the direction shown by the arrow in FIG. 9 ) to peel the film lid 50 off the flange portion 12 .
Here, as described above, the gripping portion 70 is inclined downward outward at an inclination angle of 10 degrees or more and 45 degrees or less. This allows a resistance force to be generated in the opposite direction to the direction of the arrow by gripping the gripping portion 70 with the fingers 300 when the film lid 50 is pulled off in the direction of the arrow in Fig. 9. This effectively prevents the container body 10 from moving in the direction of the arrow together with the film lid 50.
Furthermore, the lower surface 73a of the inner portion 73 is formed into a concave curved shape that corresponds to the finger 300. This allows the pad of the finger to fit well against the lower surface 73a when the gripping portion 70 is gripped with the finger, so that the container body 10 can be more reliably and effectively prevented from moving in the direction of the arrow together with the film lid 50.

Second Embodiment
Next, the second embodiment will be described with reference to Fig. 11(a), Fig. 11(b), and Fig. 11(c). In Fig. 11(b), the formation area of the joint portion 55 is indicated by hatching slanting upward to the left. Also, Fig. 11(a) and Fig. 11(c) show the container body 10 before the film lid 50 is joined. Also, in Fig. 11(b), the film lid 50 is omitted from illustration.
The plastic container 100 of this embodiment differs from the plastic container 100 of the first embodiment described above in the respects described below, but is otherwise configured in the same manner as the plastic container 100 of the first embodiment described above.

As shown in Figures 11(a) to 11(c), in this embodiment, the gripping portion 70 is formed in a curved shape that is convex outward and diagonally upward, and includes a curved portion 76 that slopes downwardly outward, and a curved upright portion 79 that stands up outward from the outer periphery of the curved portion 76.
As shown in FIG. 11B, the curved surface portion 76 is formed in an outwardly convex arc shape in a plan view.
The curved upright portion 79 is formed in a gently curved flat plate shape along the outer periphery of the curved portion 76 .
The curved upright portion 79 constitutes the edge portion 70a of the gripping portion 70, including the first edge portion 72a and the second edge portion 72b, and is a bent portion. In addition, the curved surface portion 76 constitutes the inner portion 73 of the gripping portion 70.
More specifically, in the curved upright portion 79, the average normal direction of the portion that constitutes the first edge portion 72a and extends linearly in plan view is smaller than the ratio of the component of the first normal direction to the vertical plane (not shown) in the normal direction of the inner portion 73, and the Y-direction component is the smallest among the X, Y, and Z directions. Also, in the curved upright portion 79, the average normal direction of the portion that constitutes the second edge portion 72b and extends linearly in plan view is smaller than the ratio of the component of the first normal direction to the vertical plane (not shown) in the normal direction of the inner portion 73, and the X-direction component is the smallest among the X, Y, and Z directions.
In addition, in the curved upright portion 79, the tip 71 and the area nearby are curved in an arc shape in a plan view, so that the first normal direction of the vertical plane (not shown) contacting the area gradually changes for each part. The normal direction of the tip 71 and the area nearby in the curved upright portion 79 gradually changes for each part so as to be smaller than the ratio of the component in the first normal direction of the corresponding vertical plane in the normal direction of the inner portion 73.
The average normal direction of the entire curved portion 76 has a larger proportion of the component in the first normal direction to the vertical surface 121 than the portion (bending portion) that constitutes the first edge portion 72a in the curved raised portion 79, and also has a larger proportion of the component in the first normal direction to the vertical surface 122 than the portion (bending portion) that constitutes the second edge portion 72b in the curved raised portion 79.

The curved surface portion 76 slopes downwardly outward from a corner of the outer circumferential edge of the main surface portion 12a.
The curved upright portion 79 has both ends (both ends in the extending direction) formed continuously with the flange step portion 12b. That is, the outer edge 100a of the plastic container 100 is constituted by the flange step portion 12b and the curved upright portion 79.
11(b) and 11(c), a body protrusion 31 that protrudes outward is formed at the upper end 16 of the body 11 in a portion corresponding to the corner 15. The body protrusion 31 extends, for example, in a direction along the inner periphery of the corner of the flange 12. The amount of protrusion of the body protrusion 31 gradually increases downward.

Third Embodiment
Next, the third embodiment will be described with reference to Fig. 12(a), Fig. 12(b) and Fig. 12(c). In Fig. 12(b), the formation area of the joint portion 55 is indicated by hatching slanting upward to the left. Also, Fig. 12(a) and Fig. 12(c) show the container body 10 before the film lid 50 is joined. Also, in Fig. 12(b), the film lid 50 is omitted from illustration.
The plastic container 100 of the third embodiment differs from the plastic container 100 of the second embodiment described above in the respects described below, but is otherwise configured in the same manner as the plastic container 100 of the second embodiment described above.

As shown in FIGS. 12( a ), 12 ( b ), and 12 ( c ), in this embodiment, a reinforcing rib 91 is formed on the knob portion 70 .
More specifically, for example, a reinforcing rib 91 protruding outward is formed on the curved surface portion 76. The reinforcing rib 91 is formed, for example, in the center of the curved surface portion 76. In a plan view, the reinforcing rib 91 is formed in a substantially straight line extending in a direction intersecting both the X direction and the Y direction.
The amount of protrusion of the reinforcing rib 91 gradually decreases downward. The upper edge of the reinforcing rib 91 forms a flat horizontal surface 92. On the lower surface of the curved portion 76, a portion corresponding to the formation region of the reinforcing rib 91 is recessed in the protruding direction of the reinforcing rib 91.
This configuration can ensure sufficient structural strength of gripping portion 70. Furthermore, when gripping portion 70 is gripped with fingers 300, the fingers positioned along the upper surface of gripping portion 70 can be satisfactorily hooked onto reinforcing rib 91. Thus, gripping portion 70 can be stably gripped with fingers 300.

The length dimension (dimension in the extending direction) of the reinforcing rib 91 is, for example, preferably 2 mm or more and 15 mm or less, and more preferably 2 mm or more and 12 mm or less.
The width dimension of the reinforcing rib 91 (the dimension in the direction perpendicular to the extending direction) is, for example, preferably 0.5 mm or more and 10 mm or less, and more preferably 0.5 mm or more and 8 mm or less.

<Modification 1 of the third embodiment>
Next, a first modified example of the third embodiment will be described with reference to Fig. 13(a) to Fig. 13(c). In Fig. 13(b), the region where the joint 55 is formed is indicated by hatching slanting upward to the left. Fig. 13(a) and Fig. 13(c) show the container body 10 before the film lid 50 is joined. In Fig. 13(b), the film lid 50 is not shown.
The plastic container 100 relating to variant 1 of the third embodiment differs from the plastic container 100 relating to the third embodiment described above in the respects described below, but is otherwise configured in the same manner as the plastic container 100 relating to the third embodiment described above.

As shown in Figures 13(a), 13(b), and 13(c), in this modified example, the curved surface portion 76 is formed with a reinforcing rib 91 that protrudes outward, similar to the third embodiment.

<Modification 2 of the third embodiment>
Next, a second modified example of the third embodiment will be described with reference to Fig. 14(a) to Fig. 14(c). In Fig. 14(b), the region where the joint 55 is formed is indicated by hatching slanting upward to the left. Fig. 14(a) and Fig. 14(c) show the container body 10 before the film lid 50 is joined. In Fig. 14(b), the film lid 50 is not shown.
The plastic container 100 relating to variant 2 of the third embodiment differs from the plastic container 100 relating to the above-described third embodiment and variant 1 in the respects described below, but is otherwise configured in the same manner as the plastic container 100 relating to the above-described third embodiment and variant 1.

As shown in Figures 14(a), 14(b), and 14(c), in this modified example, the curved surface portion 76 is formed with a reinforcing rib 91 that protrudes outward, as in the third embodiment and modified example 1. However, in the case of modified example 2, the reinforcing rib 91 is formed in a rounded shape that protrudes outward.

Fourth Embodiment
Next, the fourth embodiment will be described with reference to Fig. 15, Fig. 16(a) and Fig. 16(b). In Fig. 15, the region where the joint portion 55 is formed is indicated by hatching slanting upward to the left. In Fig. 15 to Fig. 16(b), the container body 10 before the film lid 50 is joined is illustrated, and the film lid 50 is omitted.
The plastic container 100 of this embodiment differs from the plastic container 100 of the above-mentioned first to third embodiments and each of their modified examples in the respects described below, but is otherwise configured in the same manner as the plastic container 100 of the above-mentioned first to third embodiments and each of their modified examples.

16(a) and 16(b), in the present embodiment, similarly to the first embodiment, the gripping portion 70 is formed in a shape that slopes downward in a step-like manner toward the tip 71. More specifically, the gripping portion 70 has, for example, sloped portions (the inclined curved portions 81 and the inclined upright portions 87) that slope downward toward the tip 71 and horizontal portions 86 that are arranged horizontally, which are alternately arranged toward the tip 71. Each of the inclined upright portions 87 on one end side and each of the inclined upright portions 87 on the other end side are bent portions.
Here, in the present embodiment, unlike the first embodiment, the outline of the knob portion 70 is formed in an outwardly convex arc shape in plan view as shown in Fig. 15. Therefore, in plan view, the first normal direction of the vertical surface (not shown) that contacts the bent portion (each inclined upright portion 87) gradually changes for each portion.
Even in such a case, the proportion of the first normal component of the vertical plane, which gradually changes for each part, in the normal direction of the bent portion (each inclined upright portion 87) is smaller than the proportion of the first normal component in the normal direction of the inner portion 73.
Therefore, in the above-mentioned trimming process, when shearing the margin 450 of the resin sheet 400, the plate surface at the boundary between each part at the edge 70a of the gripping portion 70 and the margin 450 can be made to hit the shearing blades 410, 411 in an intersecting manner rather than parallel to them, so that the surrounding margin 450 can be more easily sheared off from the gripping portion 70.
Also in this embodiment, the lower surface 70 b of the gripping portion 70 is formed into a concave curved shape corresponding to the fingers 300 by the lower surfaces (inner peripheral surfaces) of the multiple inclined curved portions 81 .

15, in this embodiment, the planar shape of the plastic container 100 is substantially elliptical. More specifically, the planar shape of the plastic container 100 is formed, for example, into a substantially elliptical shape that is elongated in the Y direction.
Even in such a case, as shown in FIG. 15, the entirety of the knob portion 70 fits within a rectangle 210 that circumscribes the flange portion 12 in a plan view.
This makes it possible to prevent the gripping parts 70 of adjacent plastic containers 100 from interfering with each other even if the plastic containers 100 are arranged in a lattice shape without gaps when transporting the plastic containers 100 or displaying them in stores.
On the other hand, when the grip portion 70 is bent and horizontal, the grip portion 70 protrudes outward from the rectangle 210 .
Therefore, the protruding length (dimension in the tilt direction) of the knob portion 70 is sufficiently ensured, and the knob portion 70 can be stably held with the fingers.

More specifically, as shown in FIG. 15, in this embodiment, the flange portion 12 has a substantially elliptical ring shape in plan view.
15 , in the present embodiment, two circumferential locations of the flange portion 12 constitute the gripping portions 70. The two gripping portions 70 each protrude radially outward from the container body 10 relative to other locations of the flange portion 12.
15, the two gripping portions 70 are formed symmetrically with respect to each other, for example, with respect to the center of the plastic container 100. However, one of the two gripping portions 70 is disposed at a position slightly offset to one side in the X direction (short axis direction of the plastic container 100) from the long axis of the plastic container 100, and the other gripping portion 70 is disposed at a position slightly offset to the other side in the X direction (same as above) from the long axis.

Each embodiment has been described above with reference to the drawings, but these are merely examples of the present invention, and various configurations other than those described above can also be adopted.

For example, in the above first to third embodiments and modified examples 1 and 2 of the third embodiment, examples have been described in which the gripping portions 70 are formed in the same shape, but in the present invention, when the plastic container 100 has multiple gripping portions 70, the gripping portions 70 may be formed in different shapes. In this case, the plastic container 100 may have two or more of the gripping portions 70 in the first to third embodiments and modified examples 1 and 2 of the third embodiment.

The present embodiment encompasses the following technical ideas.
(1) A plastic container manufactured by pressure molding or vacuum molding,
A box-shaped container body having an open top;
A flange portion extending from the upper end of the container body to the outer periphery;
a film lid that is joined to the flange portion to close an opening at an upper end of the container body;
Equipped with
One or more circumferential points of the flange portion constitute a knob portion,
The gripping portion is inclined downwardly and outwardly at an inclination angle of 10 degrees or more and 45 degrees or less,
The film cover covers the knob portion,
Each portion of the edge of the gripping portion is bent toward an inner portion of the gripping portion,
If a normal direction of a vertical plane in contact with the bent portion is defined as a first normal direction,
A plastic container in which the bent portion is bent toward the inner portion in a direction such that the proportion of the component of the first normal direction in the normal direction of the bent portion is smaller than the proportion of the component of the first normal direction in the normal direction of the inner portion.
(2) A plastic container according to (1), wherein the normal direction of the bent portion is perpendicular to the first normal direction.
(3) A plastic container according to (1) or (2), wherein the underside of the inner portion is formed into a concave curved shape that corresponds to the fingers of a hand.
(4) A plastic container as described in (3) above, in which the flange portion other than the gripping portion does not have the concave curved surface shape that corresponds to fingers.
(5) The plastic container according to (3), wherein the gripping portion slopes downward in a stepped manner toward the tip of the gripping portion.
(6) The gripping portion has an inclined portion that is inclined downward toward the tip and a horizontal portion that is horizontally disposed, alternately toward the tip,
The plastic container according to (5), wherein the edge of the inclined portion is the bent portion.
(7) A plastic container described in any one of (3) to (6), in which a reinforcing rib is formed on the gripping portion.

10 Main body portion 11 Body portion 11a Body main body portion 12 Flange portion 12a Main surface portion 12b Flange portion step portion 12c Wide width portion 13 Opening 14 Bottom surface portion 14a Central portion 14b Peripheral edge portion 15 Corner portion 16 Upper end portion 17 Step portion 17a Wide width portion 20 Concave and recessed shape 31 Body portion protrusion portion 46 Rib 50 Film lid 51 Film lid corner portion 55 Joint portion 55a Outer edge 70 Handle portion 70a Edge portion 71 Tip 72a First edge portion 72b Second edge portion 73 Inner portion 73a Lower surface 76 Curved surface portion 79 Curved upright portion 81 Inclined curved portion 81a First inclined curved portion 81b Second inclined curved portion 81c Third inclined curved portion 86 Horizontal portion 86b First horizontal portion 86c Second horizontal portion 86d Third horizontal part 87 Inclined standing part (bending part)
87a First inclined upright portion 87b Second inclined upright portion 87c Third inclined upright portion 91 Reinforcing rib 92 Horizontal surface 100 Plastic container 100a Outer edge 111 First edge 112 Second edge 121, 122 Vertical surface 210 Rectangle 211 Corner 230 Virtual lines 251, 252, 261, 262 Straight line 300 Finger 310 Thumb 320 Index finger 400 Resin sheets 410, 411 Shear blade 450 Margin

Claims (7)

A plastic container manufactured by pressure forming or vacuum forming,
A box-shaped container body having an open top;
a flange portion extending from an upper end of the container body to an outer periphery;
a film lid that is joined to the flange portion to close an opening at an upper end of the container body;
Equipped with
The flange portion has a main surface portion that protrudes from the opening of the container body to an outer periphery,
The film lid is joined to the upper surface of the main surface portion,
One or more circumferential points of the flange portion constitute a knob portion,
the knob portion is inclined downward and locally protrudes outward in a horizontal direction from the main surface portion ,
The inclination angle of the knob is 10 degrees or more and 45 degrees or less,
Each portion of the edge of the gripping portion is bent toward an inner portion of the gripping portion,
If a normal direction of a vertical plane in contact with the bent portion is defined as a first normal direction,
the bent portion is bent with respect to the inner portion in a direction such that a ratio of a component of the first normal direction in a normal direction of the bent portion is smaller than a ratio of a component of the first normal direction in a normal direction of the inner portion,
The bent portion of the plastic container includes a sloped portion that slopes downward toward the tip of the gripping portion. The plastic container according to claim 1, wherein the normal direction of the bent portion is perpendicular to the first normal direction. The plastic container according to claim 1 or 2, wherein the underside of the inner portion is formed into a concave curved shape. The plastic container according to claim 3, wherein the flange portion does not have the concave curved surface shape that corresponds to fingers, except for the gripping portion. The plastic container according to claim 3, wherein the gripping portion slopes downward in a stepped manner toward the tip of the gripping portion. A plastic container manufactured by pressure forming or vacuum forming,
A box-shaped container body having an open top;
A flange portion extending from the upper end of the container body to the outer periphery;
a film lid that is joined to the flange portion to close an opening at an upper end of the container body;
Equipped with
One or more circumferential points of the flange portion constitute a knob portion,
The gripping portion is inclined downwardly and outwardly at an inclination angle of 10 degrees or more and 45 degrees or less,
The film cover covers the knob portion,
Each portion of the edge of the gripping portion is bent toward an inner portion of the gripping portion,
If a normal direction of a vertical plane in contact with the bent portion is defined as a first normal direction,
the bent portion is bent with respect to the inner portion in a direction such that a ratio of a component of the first normal direction in a normal direction of the bent portion is smaller than a ratio of a component of the first normal direction in a normal direction of the inner portion,
The lower surface of the inner portion is formed into a concave curved shape,
The gripping portion is inclined downward in a stepped manner toward the tip of the gripping portion,
The gripping portion has an inclined portion that is inclined downward toward the tip and a horizontal portion that is horizontally disposed, and the inclined portion is arranged alternately toward the tip,
A plastic container in which the edge of the inclined portion is the bent portion. The plastic container according to claim 3, wherein the gripping portion is formed with a reinforcing rib.

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