JP2019006442A - Resin molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded product which is molded from a synthetic resin sheet, can secure strength enough to withstand stacking, and does not hinder visibility, and is a container body or a lid. SOLUTION: A resin molded product as a lid 1 is molded from a synthetic resin sheet, and is outside from a top surface portion 2, a peripheral wall surface portion 3 downward from the outer edge of the top surface portion 2, and a lower end upper end of the peripheral wall surface portion 3. The peripheral wall surface portion 3 is inflated outward in the vicinity of the flange portion 6 protruding in the direction, the streak recess 4 extending in the vertical direction on the surface of the peripheral wall surface portion 3, and the flange portion 6 on the lower side of the streak recess 4. It is characterized by having a protruding portion 5, and it is preferable that the protruding portion 5 has a shape that expands from the upper side to the lower side in a side view. [Selection diagram] Fig. 3

Description

  The present invention relates to a resin molded product that is molded from a synthetic resin sheet and serves as a container body or a lid that mainly contains food or the like.

Recently, it is seen that lunch boxes, salads, side dishes, fruits, etc. are enclosed in packaging containers made up of container bodies and lids formed from thin resin sheets and sold at retail stores.
Such packaging containers are often stacked in a plurality of stages and displayed at a storefront, and require strength sufficient to withstand the stacking.

  For example, as shown in FIG. 6, a lid body 104 that includes a top plate portion 102 in which ridges 101 are formed at at least opposite end edges and a side wall portion 103 that is connected downward from the top plate portion 102. The first rib recess 105 having a substantially trapezoidal shape in which the lengths of the upper end portion and the lower end portion are different from each other in the side wall portion 103 and at least an area connected to the ridge 101 formed on the top plate portion 102. Are provided, and a second rib recess 106 is formed over the top of the protrusion 101 at a portion continuous with the upper end of the first rib recess 105 of the protrusion 101. A lid 104 characterized by being partly divided by the second rib recess 106 has been developed, and at least at the edge portion even when molded using a thinner synthetic resin sheet For loads equivalent to conventional That resistance can have a (rigid), and are also available of ensuring even through property at the side wall portion (see Patent Document 1).

  Moreover, as shown in FIG. 7, the transparent synthetic | combination provided with the side wall part 201 connected downward from the outer periphery of the top plate part 200, the top plate part 200, and the flange part 202 connected to the lower end of the side wall part 201. The lid 203 is obtained by thermoforming a resin sheet, and the side wall 201 has a concave portion 204 having the same depth from the lower end to the upper end of the side wall portion 201 and a concave portion based on the lower end surface of the concave portion 204. A suitable number of reinforcing structures including vertical reinforcing ribs 205 protruding outward from the bottom surface of the portion 204 are provided, and the wall surfaces other than the place where the reinforcing structure is formed in the side wall portion 201 are flat surfaces. Has been developed, and even with a lid obtained by thermoforming a very thin synthetic resin sheet, the required compressive strength can be ensured and visibility is hindered. Do not Are then manner (see Patent Document 2).

JP 2012-3087 A JP 2014-141270 A

Various developments have been made to ensure the strength of the lid of a packaging container molded from a synthetic resin sheet, such as the lids 104 and 203.
The lid 104 is provided with a first rib recess 105 in the side wall 103, and the lid 203 is provided with a recess 204 and a reinforcing rib 205 in the side wall 201 to increase the strength. As shown in FIG. 7, the side wall portions 103 and 201 have irregularities, which hinders visibility from the side surfaces, and the top plate portions 102 and 200 are covered particularly when the packaging containers are stacked in several stages. The nature was hindered and the contents were difficult to see.

  Accordingly, an object of the present invention is to provide a resin molded product that is molded from a synthetic resin sheet, can secure strength enough to withstand stacking, and does not hinder visibility, and can be a container body or a lid. It is in.

  The resin molded product of one embodiment of the present invention is a resin molded product that is molded from a synthetic resin sheet and serves as a container body or a lid, and the lower surface from the outer surface of the top surface or bottom surface and the top surface or bottom surface or A peripheral wall surface portion that extends upward, a flange portion that protrudes outward from the lower end or upper end of the peripheral wall surface portion, a streak recess or streak convex portion that extends in the vertical direction on the surface of the peripheral wall surface portion, and a streak recess or A protrusion having a peripheral wall surface bulging outward is provided in the vicinity of the flange on the lower side of the streak-shaped convex portion.

  The resin molded product of the above form is provided with a streak-like recess or streak-like convex part extending in the vertical direction on the surface of the peripheral wall surface part, and a projection is provided in the vicinity of the flange part below the streak-like recess or streak-like convex part Accordingly, the streak-shaped concave portion or the streaky convex portion and the protruding portion function integrally to increase the strength of the resin molded product, and in particular, it is possible to ensure the strength against the load in the vertical direction. Moreover, since the streak-like concave part or the streak-like convex part is formed in a streak shape (narrow width), when the resin molded product is formed from a transparent synthetic resin sheet, the visibility is hardly obstructed and visibility can be secured.

  In the resin molded product of the above form, the protruding portion can have a shape that expands from the upper side to the lower side in a side view, and the streak-like recess or the streak-like projection can be formed in a V-shaped cross section. it can. Further, the protruding portion can be provided at a height portion of 1/4 or less with respect to the height of the peripheral wall surface portion, and specifically, a triangle is formed at a corner portion formed by the peripheral wall surface portion and the flange portion. It is preferable to form it in a conical shape.

  By doing in this way, the intensity | strength of a resin molded product increases further, and it can be set as the container main body and cover body which do not deform | transform even if it piles up.

It is a perspective view of the lid as one embodiment of the resin molded product of the present invention. It is a side view of the cover body of FIG. It is a partial expansion perspective view containing the partial cross section of the cover body of FIG. It is the partial expansion perspective view containing the partial cross section which showed the modification of the cover body of FIG. It is a figure which shows the example of a display of the packaging container using the cover body of FIG. It is a perspective view which shows one well-known example of the conventional cover body. It is a perspective view which shows the other well-known example of the conventional cover body.

  Hereinafter, an embodiment of a resin molded product of the present invention will be described with reference to the drawings.

As shown in FIG. 1 or 2, the resin molded product of one embodiment of the present invention is a lid 1, and the lid 1 includes a top surface portion 2, a peripheral wall surface portion 3, a streaky recess 4, The protrusion part 5 and the flange part 6 are provided.
Hereinafter, although the cover body 1 is demonstrated, the resin molded product of this invention can also be used as a container main body. In this case, the lid body 1 is turned upside down, and the top surface portion 2 of the lid body 1 corresponds to the bottom surface portion.

  As shown in FIG. 1, the lid 1 has a top hat shape, that is, a cylindrical shape with a slight height, and is not particularly limited. However, the lid 1 is a food container such as a lunch box container, a side dish, salad, a fruit packaging container, etc. It is preferable to use for the container which accommodates. The shape of the lid 1 is not particularly limited, and may be, for example, a rectangular tube shape, an oval shape, or an elliptical tube shape. Moreover, when the cover body 1 is made into a cylindrical shape, it is preferable that the height is 0.5 to 2, particularly 0.8 to 1.5 with respect to the diameter of the top plate portion 2.

  The lid 1 can be manufactured by thermoforming a synthetic resin sheet having a sheet thickness of 0.1 mm to 3 mm, preferably 0.2 mm to 2 mm, for example.

The synthetic resin sheet is not particularly limited, but may be a foamed resin sheet or a non-foamed resin sheet. For example, a polyolefin resin sheet such as a polyethylene resin sheet or a polypropylene resin sheet, a polystyrene resin sheet, Examples of the thermoplastic resin sheet include a polyester resin sheet such as a polyethylene terephthalate resin sheet and a modified polyethylene terephthalate resin sheet imparted with heat resistance. Especially, what can endure the heating of a microwave oven, for example, a heat-resistant polystyrene-type resin sheet, a polypropylene-type resin sheet, and the modified polyethylene terephthalate-type resin sheet provided with heat resistance are preferable.
Moreover, a laminated sheet can also be used as the synthetic resin sheet. Examples of the laminated sheet include a laminated sheet obtained by thermally laminating a film on a synthetic resin sheet, a laminated sheet obtained by a coextrusion method, and a laminated sheet obtained by an extrusion lamination method. Can do.

  Examples of thermoforming include vacuum forming, pressure forming, vacuum pressure forming, hot plate forming, and the like.

  The lid 1 may be transparent, translucent, or colored such as black or white, but is preferably transparent or translucent so that the inside can be visually recognized.

  As shown in FIG. 1, the top surface portion 2 is formed in a horizontal plane shape that is circular in plan view. However, the shape is not limited thereto, and may be, for example, a plan view elliptical shape or an oval shape, a plan view rectangular shape, a plan view polygonal shape such as a plan view hexagonal shape or a plan view octagonal shape. Moreover, the top surface portion 2 is not in a horizontal plane shape, and may be provided with unevenness that does not get in the way when stacking.

As shown in FIG. 1 or FIG. 2, the peripheral wall surface portion 3 is an inclined surface that is inclined so as to expand slightly downward from the edge of the top surface portion 2. The peripheral wall surface portion 3 is not limited to this, and may be a vertical vertical surface, or may be formed as a curved curved surface slightly protruding upward or slightly concave downward.
A flange portion 6 is formed at the lower end portion of the peripheral wall portion 3 so as to project outward with a constant width.

The streak-like concave portion 4 is formed in a narrow groove shape so as to extend in the vertical direction on the peripheral wall surface portion 3, and is formed linearly from the top surface portion 2 to the flange portion 6. Further, the streak-like recesses 4 are formed at 12 locations at substantially equal intervals in the circumferential direction. However, the present invention is not limited to this, and it is preferable to form the lid 1 at, for example, 4 to 20 locations depending on the size and strength of the lid 1.
In the present embodiment, the streak-like recess 4 is formed in a V-shaped cross section, but the present invention is not limited to this, and as shown in FIG. As shown in FIG. 4 (B), it may be a semicircular cross section or a U-shaped streak-like recess 4b. Further, the streak-like concave portion 4 may be a streak-like convex portion 4c that protrudes outward from the peripheral wall surface portion 3, as shown in FIG. The streak-like convex portion 4c has a V-shaped cross section, but is not limited thereto, and may have a square cross section, a semicircular or U-shaped cross section, or the like.

Depending on the size of the lid 1, the streak-like recess 4 is preferably provided, for example, in a range that occupies 5% to 25%, particularly 10% to 20%, of the outer peripheral length of the top surface portion 2. For example, the width of each streak-shaped recess 4 is preferably 2 mm to 10 mm, particularly about 3 mm to 7 mm on the surface of the peripheral wall portion 3. In the present embodiment, the streak-like recesses 4 are formed with substantially the same width in the vertical direction, but may have a shape that expands or narrows upward.
The depth of the streak-like recess 4 depends on the size of the lid 1, but is preferably about 0.5 mm to 7 mm, particularly about 2 mm to 5 mm, for example. In the present embodiment, the streak-like recesses 4 are formed at substantially the same depth in the vertical direction, but may be shaped so as to become shallower or deeper upward.

The projecting portion 5 is provided in the vicinity of the flange portion 6 near the lower portion of the streak-like concave portion 4, and in this embodiment, the corner portions of the peripheral wall surface portion 3 and the flange portion 6 expand from the upper side to the lower side in a side view. The opening shape, specifically, it is formed by bulging outward in the shape of a triangular pyramid, the upper end is accommodated in the streak-like recess 4, and the lower end is wider than the streak-like recess 4. The bottom 41 of the streak-like recess 4 and the top 51 of the protrusion 5 are connected in a straight line in a side view.
In the present embodiment, every other protruding portion 5 is provided with respect to the streak-like recess 4, but may be provided in each streak-like recess 4. In addition, it is preferable that the upper end of the protruding portion 5 is narrower or the same width as that of the streak-like recess 4 so as to be accommodated in the streak-like recess 4.

Although the height along the peripheral wall surface part 3 of the protrusion part 5 is not specifically limited, the height below 1/4 with respect to the height along the peripheral wall surface part 3 from the flange part 6 to the top | upper surface part 2 is. A height of 1/6 or less is particularly preferable. By doing in this way, when the cover body 1 is made transparent, the visibility of the surrounding wall surface part 3 can be improved.
The maximum width of the protrusion 5 in a side view depends on the size of the lid 1, for example, 5 mm to 15 mm, particularly 8 mm to 12 mm is preferable, and the protrusion width of the protrusion 5 depends on the size of the lid 1. For example, 2 mm to 10 mm, particularly 3 mm to 7 mm at the maximum from the surface of the peripheral wall portion 3 is preferable.

  The protrusion 5 is formed in a triangular pyramid shape in the present embodiment, but is not limited to this, and may have a shape that expands from the top to the bottom in a side view. For example, FIG. As shown to (A), it can also be set as the trapezoid-shaped protrusion part 5a or the drop-shaped protrusion part 5b as shown in FIG.4 (B).

A skirt portion 7 that hangs down or slopes is formed on the outer edge of the flange portion 6, and an engaging portion 71 that protrudes inward of the lid body 1 is provided on the surface of the flange portion 6, whereby the container It can be externally fitted to a main body (not shown).
In the present embodiment, the lid body 1 has an outer fitting structure, but an inner fitting structure or an inner / outer fitting structure can also be used. Inner fitting structure and inner / outer fitting structure have high sealing performance and can prevent the juice from leaking out of the container, so the juice does not reach the flange part and the fingertips can be made difficult to get dirty. .

  The flange portion 6 and the skirt portion 7 are swelled in a square shape in cross section, and vent portions 8 communicating with the inside and outside of the lid body 1 are formed at appropriate intervals so as to allow ventilation. A second flange portion 9 is formed on the outer edge of the skirt portion 7 so as to project horizontally outward and with its tip directed upward.

The lid 1 is provided with a streak-like recess 4 extending in the vertical direction on the surface of the peripheral wall part 3, and by providing a protruding part 5 in the vicinity of the flange part 6 on the lower side of the streak-like recess 4, The protrusion 5 functions integrally, and the strength of the lid 1 can be increased. In particular, the strength against the load in the vertical direction can be ensured. This seems to be because the protrusion 5 disperses the load concentrated on the streak-like recess 4.
For this reason, even if the packaging container provided with the lid 1 is stacked, the lid 1 can be prevented from being crushed. Since the strength is improved by the streak-like recess 4, the synthetic resin sheet to be molded can be thinned, the amount of the plastic raw material used can be suppressed, the cost can be reduced, and the resource can be saved.

Moreover, since the streak-like recessed part 4 is formed in a narrow width, when the lid 1 is formed from a transparent synthetic resin sheet, it is difficult to block the field of view, and visibility can be ensured.
For example, as shown in FIG. 5 (A), when the packaging container with the lid 1 closed is displayed on a stepped shelf and viewed from the side indicated by the arrow X, the streak-like concave portion 4 becomes obstructive. It is easy to see the internal contents. In addition, as shown in FIG. 5B, when the packaging containers with the lid 1 closed are stacked and displayed in a plurality of stages and viewed from the side indicated by the arrow Y, the streak-like recess 4 is obstructive. Since the synthetic resin sheet to be molded can be thinned as described above, the transparency can be improved from this point.

  The configuration aspect of the above embodiment is not intended to limit the present invention, but can be changed as long as the technical purpose is common, and the present invention includes such a change.

1 lid 2 top surface 3 circumferential wall 4, 4 a, 4 b streak (4 c streak)
41 bottom 5a-5c protrusion 51 top 6 flange 7 skirt 71 engagement part 8 ventilation part 9 second flange part

Claims (5)

A resin molded product molded from a synthetic resin sheet and serving as a container body or lid,
A top surface portion or a bottom surface portion, a peripheral wall surface portion extending downward or upward from an outer edge of the top surface portion or the bottom surface portion, a flange portion projecting outward from a lower end or an upper end of the peripheral wall surface portion, A line-shaped concave part or line-shaped convex part extending in the vertical direction on the surface, and a projecting part in which the peripheral wall surface part is expanded outward in the vicinity of the flange part on the lower side of the line-shaped concave part or the line-shaped convex part, Molded resin product.   2. The resin molded product according to claim 1, wherein the protruding portion has a shape that expands from the top to the bottom in a side view.   The resin-molded article according to claim 1 or 2, wherein the streak-shaped recess or the streaky-projection is formed in a V-shaped cross section.   The resin projection according to any one of claims 1 to 3, wherein the protruding portion is provided at a height portion of 1/4 or less with respect to a height of the peripheral wall surface portion.   5. The resin molded product according to claim 1, wherein the protruding portion is formed to bulge in a triangular pyramid shape at a corner portion formed by the peripheral wall surface portion and the flange portion.

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