Synthetic resin container

Abstract

To easily separate a label at the time of disposal while taking into consideration the effect on appearance.SOLUTION: A container 1 is provided with a bottom 5 including: a planar ground contact portion 51 provided with a predetermined width; a heel portion 50 consisting of a curved surface that convexly extends outwardly from the container and gradually expands in diameter upward from the outer circumferential edge side of the ground contact portion 51; a bottom surface portion that is recessed inwardly of the container and includes an inclined peripheral surface portion 52 that rises diagonally upward from the inner circumferential edge side of the ground contact portion 51 toward the radially inward side. A bulge portion 53 is provided on the inclined peripheral surface portion 52, and a recess portion 54 is provided along the portion that wraps around from the heel portion 50 to the side of the ground contact portion 51 and reaches the bulge portion 53, so that the ground contact portion 51 provided between the heel portion 50 and the inclined peripheral surface portion 52 extends uninterrupted in the circumferential direction via a detour portion 51a that detours around the recess portion 54.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a container made of synthetic resin.

Background Art

[0002] Conventionally, a preform is produced using a polyester resin such as polyethylene terephthalate, and then this preform is formed into a bottle shape by biaxial stretch blow molding or the like. Containers made of synthetic resin are widely used in a wide range of fields as containers containing various beverages, various seasonings, and the like as contents.

[0003] When such a container is filled with contents and put on the market, for example, as disclosed in Patent Document 1, generally, a label printed with indications such as a product name and a design is attached.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, a recess is formed in a portion where the end of the label is located so that a gap is formed between the wall surface of the container body and the end of the label that allows a fingertip to be inserted, so that the label can be easily separated from the container body at the time of disposal. When forming such a recess, Patent Document 1 states that if it is formed in a portion from the lower part to the bottom of the body of the container body, it is difficult to be conspicuous in terms of position and the appearance is hardly impaired.

[0006] In view of such background art, the present inventors have intensively studied to make it possible to easily separate the label at the time of disposal while considering the influence on the appearance, and as a result, have completed the present invention.

Means for Solving the Problems

[0007] The synthetic resin container of the present invention comprises a bottom having a planar ground contact portion having a predetermined width, a heel portion consisting of a curved surface that convexly extends outward from the container and gradually expands in diameter upward from the outer circumferential edge side of the ground contact portion, and a bottom surface portion that is recessed into the container and includes an inclined peripheral surface portion that rises diagonally upward from the inner circumferential edge side of the ground contact portion toward the radially inward direction, the inclined peripheral surface portion having a bulge portion that bulges out flush with the ground contact portion, and a recess portion is provided along the portion that wraps around from the heel portion to the ground contact portion and reaches the bulge portion, and the ground contact portion provided between the heel portion and the inclined peripheral surface portion extends uninterrupted in the circumferential direction via a detour portion that bypasses the recess. Effect of the Invention

[0008] According to the present invention, the label can be easily separated when discarding. [Brief description of the drawings]

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

[0010] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a perspective view showing an outline of a synthetic resin container according to this embodiment, FIG. 2 is a front view of the same, and FIG. 3 is a bottom view of the same.

[0012] As an example shown in these figures, the container 1 includes a mouth portion 2, a shoulder portion 3, a body portion 4, and a bottom portion 5. Such a container 1 can be manufactured by using a thermoplastic resin to produce a preform formed into a bottomed cylindrical shape by injection molding, compression molding, etc., and then forming this preform into a predetermined container shape by biaxial stretch blow molding or the like.

[0013] As the thermoplastic resin to be used, any resin capable of blow molding can be used. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, amorphous polyarylate, polylactic acid, polyethylene furanoate, or copolymers thereof can be used. In particular, ethylene terephthalate-based thermoplastic polyesters such as polyethylene terephthalate can be preferably used. These resins may be mixed in two or more kinds, or other resins may be blended. Polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene, etc. can also be used. The preform is not limited to being formed into a single layer, and can also be formed into a multilayer including a gas barrier layer or the like according to the characteristics required for the container 1.

[0014] The mouth portion 2 is a cylindrical portion that serves as an injection outlet for the contents. In the illustrated example, an engaging protrusion 21 for attaching a lid body (not shown) by screwing is provided on the side surface of the opening end side of the mouth portion 2 when sealing the container 1 filled with the contents.

[0015] Further, a neck ring 22 that projects annularly along the circumferential direction is provided on the mouth portion 2. The mouth portion 2 is defined to include a portion that hangs down in a cylindrical shape with substantially the same diameter starting from directly below the neck ring 22. The lower end of such a mouth portion 2 is connected to the shoulder portion 3 that connects between the mouth portion 2 and the body portion 4. In the illustrated example, the shoulder portion 3 is formed in a rounded frustum shape.

[0016] The body portion 4 occupies most of the height direction of the container 1. The upper end of the body portion 4 is connected to the shoulder portion 3, and the lower end is connected to the bottom portion 5. In the illustrated example, the body portion 4 is formed in a rectangular tube shape with a substantially rectangular cross-sectional shape, but the specific shape of the body portion 4 is not limited to this.

[0017] Here, the height direction refers to the direction perpendicular to the horizontal plane when the container 1 is placed upright on the horizontal plane with the mouth portion 2 facing upward. In this state (the state shown in FIG. 2), the up-down, left-right, vertical, and horizontal directions of the container 1 are defined.

[0018] In this embodiment, the bottom portion 5 includes a planar grounding portion 51 provided with a predetermined width, a heel portion 50 formed by a curved surface convex outward of the container that gradually expands in diameter upward from the outer peripheral edge side of the grounding portion 51, and an inclined circumferential surface portion 52 that rises obliquely upward radially inward from the inner peripheral edge side of the grounding portion 51 and has a bottom surface portion that is recessed inward of the container.

[0019] The grounding portion 51 is a portion that becomes a grounding surface in contact with the horizontal plane when the container 1 is placed upright on the horizontal plane, and is provided to extend along the circumferential direction between the heel portion 50 and the inclined circumferential surface portion 52. The width of such a grounding portion 51 (the grounding width of the grounding surface) can be appropriately designed so that the container 1 can be stably placed upright.

[0020] For example, if the width of the grounding portion 51 is wide and the area of the grounding surface is large, there is a risk that distortion may occur on the grounding surface due to the influence of sink marks or the like caused by the shrinkage of the resin after blow molding, which is not preferable for stably standing the container 1. Considering such problems, the width of the grounding portion 51 is preferably about 2.5 to 5.0 mm.

[0021] On the inclined circumferential surface portion 52 that rises obliquely on the inner peripheral edge side of the grounding portion 51, a bulging portion 53 is provided so that the inclined circumferential surface portion 52 bulges partially and is flush with the grounding portion 51. In the illustrated example, the bulging portion 53 provided on the inclined circumferential surface portion 52 projects in an arc shape such that the radially outer portion of the inclined circumferential surface portion 52 is flush with the grounding portion 51, and bulges so that the height with respect to the inclined circumferential surface portion 52 decreases toward the radially inner side. In this way, as long as it bulges to have a portion flush with the grounding portion 51, the specific shape of the bulging portion 53 is not particularly limited.

[0022] Also, the position and number of the bulging portions 53 provided are not particularly limited. For example, a pair of bulging portions 53 can be provided symmetrically at respective positions facing each other in the radial direction of the bottom portion 5. In the illustrated example, a pair of bulging portions 53 are provided symmetrically at the central portions of the opposing long side portions of the bottom portion 5 having a rectangular cross-sectional shape.

[0023] In this embodiment, after providing such a bulging portion 53 on the inclined circumferential surface portion 52, a recess 54 is provided along the portion that wraps from the heel portion 50 toward the grounding portion 51 side and reaches the bulging portion 53. By doing so, a detour portion 51a that is continuous with the grounding portion 51 flush is formed around the terminal edge side of the recess 54 that has reached the bulging portion 53 across the grounding portion 51. Thereby, the grounding portion 51 provided between the heel portion 50 and the inclined circumferential surface portion 52, which would be divided by the recess 54 if there were no bulging portion 53, extends along the circumferential direction without interruption via the detour portion 51a that detours around the recess 54.

[0024] In a container 1 having such a bottom 5, a label L with printed indications such as a product name and a design can be attached. As the label L, for example, a heat-shrinkable film material (shrink film) having proper printability can be suitably used. In this case, a heat-shrinkable film material with desired printing is formed into a tube shape and put over the container 1, and by heating and shrinking it so as to adhere to the side surface of the container 1, it can be attached to the container 1. At that time, a breakable portion such as a perforation is provided on the label L, and the label L can be attached so as to be aligned with the recess 54 provided on the bottom 5.

[0025] Furthermore, when attaching the label L to the container 1, by bringing the lower edge of the label L close to the lower edge of the heel portion 50 (the boundary between the heel portion 50 and the grounding portion 51) and making it so that there is as little gap as possible between them, the recess 54 is covered by the label L and becomes less conspicuous, and the influence on the appearance can be reduced.

[0026] According to the present embodiment, by providing the recess 54 so as to wrap around from the heel portion 50 toward the grounding portion 51 side, even when the lower edge of the label L is brought close to the lower edge of the heel portion 50, a sufficient gap can be secured to insert a fingertip between the container 1 and the label L (see FIG. 5). Thereby, when discarding the used container 1, a fingertip can be easily hooked on the lower edge of the label L, and the breakable portion aligned with the recess 54 can be surely broken, whereby the label L can be peeled off from the container 1 and easily separated. When separating the label L from the container 1 in this way, it is also possible to grope for the position of the recess 54 by relying on the bulging portion 53 and insert a fingertip between the container 1 and the label L.

[0027] Here, FIG. 5 is an enlarged view of the main part of the B-B cross section of FIG. 3, and schematically shows a state where a fingertip is hooked on the lower edge of the label L attached to the container 1. Actually, the label L is in close contact with the heel portion 50. As shown in the figure, the width and depth of the recess 54 can be appropriately designed in consideration of the size of an average person's fingertip.

[0028] Also, when attaching the label L made of a heat-shrinkable film material with the lower edge of the label L close to the lower edge of the heel portion 50, if the label L shrinks so as to follow and adhere to the concave portion 54, it becomes difficult to secure a gap for inserting a fingertip, and it is not preferable in terms of appearance. When shrinking and attaching the label L that is formed in a tubular shape and covers the container 1, the longer the distance until the label L adheres to the side surface of the container 1, the greater the amount of shrinkage. As in the illustrated example, when the cross-sectional shape of the bottom portion 5 is rectangular, the amount of shrinkage is the largest on the long side, and the amount of shrinkage is the smallest at the corner portion. Therefore, when the cross-sectional shape of the bottom portion 5 is rectangular, if the concave portion 54 is provided on the long side thereof, the label L shrinks so as to be stretched between both side portions in the circumferential direction of the concave portion 54, and in a state of being lifted from the concave portion 54, the label L can be attached so that a sufficient gap for inserting a fingertip is stably secured.

[0029] Also, for example, in the filling process of contents such as various food and beverage products including liquid foods, edible oils, seasonings, etc., the bottom portion 5 side (the bottom surface portion that is recessed inward of the container) of the container 1 that is standing upright on the line may be vacuum-sucked to convey the container 1. Even in such a case, since the grounding portion 51 is provided so as to extend along the circumferential direction without interruption via the detour portion 51a that detours around the concave portion 54, no vacuum leakage occurs during suction and no problem occurs in conveyance.

[0030] After the container 1 filled with the contents through the filling process is sealed by attaching a lid to the mouth portion 2 or the like, it is shipped as a product after being packed as necessary.

[0031] As described above, the present invention has been described with reference to the preferred embodiments. However, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

Explanation of Reference Numerals

[0032] 1 Container 5 Bottom 50 Heel Portion 51 Grounding Portion 51a detour part 52 inclined circumferential surface part 53 bulging part 54 concave part L label

Claims

1. A planar grounding portion provided with a predetermined width, A heel portion formed of a curved surface that bulges outward from the container and gradually increases in diameter upward from the outer peripheral edge side of the grounding portion, A bottom portion that is recessed inward from the container and includes an inclined circumferential surface portion that rises obliquely upward from the inner peripheral edge side of the grounding portion toward the radially inner side And having a bottom portion, The inclined circumferential surface portion is provided with a bulging portion that bulges flush with the grounding portion, and a concave portion is provided along a portion that wraps around from the heel portion toward the grounding portion side and reaches the bulging portion, The grounding portion provided between the heel portion and the inclined circumferential surface portion extends along the circumferential direction without interruption through a detouring portion that detours around the concave portion. A synthetic resin container characterized by this.

2. The bulging portion projects so that the portion on the radially outer side of the inclined circumferential surface portion is flush with the grounding portion, and bulges so that the height with respect to the inclined circumferential surface portion decreases toward the radially inner side. The synthetic resin container according to Claim 1.

3. A pair of the bulging portions are symmetrically provided at respective portions facing each other in the radial direction of the bottom portion. The synthetic resin container according to Claim 1.

4. The cross-sectional shape of the bottom portion is rectangular, and the concave portion is provided on the long side thereof. The synthetic resin container according to Claim 1.

5. The synthetic resin container according to any one of Claims 1 to 4, wherein a label is attached with the lower edge of the label being close to the lower edge of the heel portion.

6. A product filled with the synthetic resin container according to Claim 5.

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