JP3818842B2 - Direct blow molded container - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a direct blow molded container, and more particularly to a direct blow molded container excellent in internal pressure resistance and self-supporting property.
[0002]
[Prior art and problems to be solved by the invention]
Plastic containers formed by blow molding such as direct blow molding or injection blow molding are frequently used as containers preferable for containing drinking water, cosmetics, and the like. Such a plastic container needs to have sufficient strength against a load applied from the outside, such as an impact at the time of dropping or an impact with a surrounding object, and generates particularly pressurized fluid or gas. When accommodating a fluid, it is necessary to provide sufficient internal pressure resistance.
[0003]
In order to make a plastic container excellent in internal pressure resistance, it is effective to make the container have a circular or nearly circular cross-sectional shape and to form a circular peripheral wall surface and a curved bottom surface. However, if the entire bottom surface is curved, the container cannot maintain its independence. For this reason, the structure of the bottom surface portion is adopted to ensure the self-supporting stability by causing the plurality of support leg portions to protrude downward from the bottom surface and bringing the support leg portions into contact with the grounding surface and standing the container. Yes.
[0004]
A plastic container for pressurized fluid having both internal pressure resistance and self-supporting property by constituting the bottom surface portion of the container with a curved surface portion and support leg portions is described in, for example, Japanese Patent Laid-Open No. 4-215936. However, this plastic container is formed by injection blow molding, and since the bottom surface portion is a complex uneven surface with deep unevenness, a pair of molds joined via a parting surface is used. When forming by direct blow molding, it was difficult to remove the molds on both sides. In other words, a conventional plastic container with excellent internal pressure resistance and self-supporting property is formed by injection blow molding using a dedicated mold on the bottom portion, and is used to manufacture a small amount of various types of plastic containers. There was no configuration that could be formed by suitable direct blow molding.
[0005]
An object of this invention is to provide the direct blow molding container excellent in internal pressure resistance and self-supporting property which can be formed easily by direct blow molding.
[0006]
[Means for Solving the Invention]
The present invention is molded by direct blow molding, on its bottom portion, and the curved portion, a direct blow molded container and a support leg for vertically protruding disposed containers across the curved surface portion, wherein The curved surface portion constitutes a part of an imaginary spherical surface that is continuously integrated with the lower end of the peripheral wall portion of the container body and protrudes downward, and the support leg portion is interposed between the adjacent curved surface portions, Both sides are sandwiched by the supporting leg portions and divided in the circumferential direction, and a central curved surface portion constituting a part of the spherical surface is also exposed below in a circular region in the center of the bottom surface portion. , all line segment extending horizontally outward from the center side of the bottom portion through the side wall surface of the supporting leg portion connected to the curved section, the angle from the curved portion side with respect to the parting surface by the direct blow molding Is the bottom The so that in plan view 90 degrees or more, the and the support foot is formed, and the support leg, its lower end, the only height capable forced disconnect the direct blow molding central curved The above object is achieved by providing a direct blow molded container provided so as to be positioned below the portion .
[0007]
Here, the line segment passing through the side wall surface of the support leg is a line segment that can be drawn on the side wall surface, and the horizontal line when the direct blow molded container is erected It means a line segment extending outward from the center side of the bottom surface. Further, the angle from the curved surface side to the parting surface by the direct blow molding of the line segment is an angle in the extension direction when the line segment is a straight line, and when the line segment is a curve. Means an angle in each tangent direction at an arbitrary position.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The direct blow molding container 10 according to the first preferred embodiment of the present invention shown in FIGS. 1 to 3 is formed by direct blow molding for containing a liquid cosmetic that generates a considerable internal pressure by generating gas, for example. The bottom surface portion 11 of the plastic container includes a curved surface portion 12 and support leg portions 13 that protrude downward from the curved surface portion 12.
[0009]
The direct blow molded container 10 of the first embodiment is made of PE (polyethylene), and the peripheral wall portion 14 of the container body has a cylindrical shape with a diameter of about 50 mm and a height of about 140 mm, and its upper end has A mouth and neck portion 15 in which a male screw is formed is provided. In addition, the direct blow molded container 10 is inflated by extruding a parison into a hollow portion formed by a pair of molds (not shown) joined via a parting surface 17 and sending air into the interior, and the inner wall surface of the mold. It is molded by being pressed and cooled and solidified, and after molding, it is taken out by removing a pair of molds on both sides.
[0010]
According to the direct blow molding container 10 of the first embodiment, the curved surface portion 12 constituting the bottom surface portion 11 has a center line 16 whose parting surface 17 is formed by direct blow molding (parting surfaces of a pair of molds are The bottom surface 11 is provided in four radial positions so as to come to a position of 45 degrees in plan view from below, and the support leg 13 has a center line 18 at the parting surface 17. On the other hand, four locations are provided radially so that the bottom surface portion 11 is positioned at 0 degrees and 90 degrees when viewed from below.
[0011]
Further, all the line segments 21 going from the center 20 side of the bottom surface portion 11 passing through the side wall surface 19 of the support leg portion 13 connected to the curved surface portion 12 to the outside in the horizontal direction are from the curved surface portion 12 side to which the side wall surface 19 is connected. The support leg portion 13 is formed so that the angle θ with respect to the partition surface 17 is 90 degrees or more when the bottom surface portion 11 is viewed from below.
[0012]
Curved surface portion 12, which forms a part of a virtual spherical surface projecting downward continuously integrated with the lower end of the peripheral wall portion 14 of the container 10 with a radius of curvature of about 10 to 30 mm, the adjacent curved portion 12 by supporting legs 13 is interposed between, and on both sides is divided into four more pinched circumferential direction on the support legs 13. In addition, the spherical surface is exposed downward as a central curved surface portion 22 in a circular region having a diameter of about 12 mm at the center of the bottom surface portion 11.
[0013]
That is, the direct blow molded container 10 according to the first embodiment has a structure rich in internal pressure resistance by having the curved surface portions 12 and 22 on the bottom surface portion 11.
[0014]
The support leg 13 is an approximately quadrangular pyramid-shaped protruding portion that is interposed between the adjacent curved surface portions 12 and protrudes obliquely downward from the spherical surface, the ridgeline being curved without angling, and its lower end portion is The height is set to be lower than the central curved surface portion 22 by a height that allows forcible punching in direct blow molding. As a result, when the molded container 10 is placed upright, the lower ends of the four support legs 13 are brought into contact with the ground surface, and the curved surface portions 12 and 22 are brought into contact with the ground surface in a stable state. It becomes possible to be independent.
[0015]
Further, each support leg portion 13 having a substantially quadrangular pyramid shape is integrally connected to the central curved surface portion 22 with a gentle one-side surface 23 on the central side, and is integrally connected to the peripheral wall portion 14 with one outer surface 24 steeply inclined. Turn into. Further, the side wall surfaces 19 on both sides become inclined surfaces and are respectively connected and integrated with the curved surface portions 12 on both sides, and as described above, from the center 20 side of the bottom surface portion 11 passing through the side wall surfaces 19 outward in the horizontal direction. In all the line segments 21 that face, the angle θ from the curved surface portion 12 side with respect to the parting surface 17 is 90 degrees or more when the bottom surface portion 11 is viewed from below. As a result, when the pair of molds are pulled sideways to form the direct blow molded container 10 by direct blow molding, the support legs 13 do not hinder the movement of the mold. It is possible to smoothly extract from the mold.
[0016]
That is, the direct blow molded container of the first embodiment is excellent in internal pressure resistance and self-supporting properties, and can be easily formed by direct blow molding.
[0017]
4 to 6 show a direct blow molded container 30 according to a reference example , and this molded container 30 has the same configuration as the direct blow molded container 10 according to the first embodiment except for the bottom surface portion 31. It has.
[0018]
The bottom surface portion 31 of the direct blow molded container 30 of the present reference example includes a curved surface portion 32 and support leg portions 33 that project downward from the curved surface portion 32, and the curved surface portion 32 has a center line 34. Is provided at one place extending in a strip shape with a width of about 10 mm across the center of the bottom surface portion 31 so as to be at a position of 90 degrees with respect to the parting surface 35. Further, a pair of support legs 33 are provided so as to protrude downward on both sides of the curved surface portion 32.
[0019]
Further, according to the present reference example , all the line segments 38 from the center 37 side of the bottom surface portion 31 passing through the side wall surface 36 of the support leg portion 33 connected to the curved surface portion 32 toward the outside in the horizontal direction are The support legs 33 are formed so that the angle θ ′ with respect to the parting surface 35 from the side of the curved surface portion 32 to be connected is 90 degrees or more when the bottom surface portion 31 is viewed from below.
[0020]
The curved surface portion 32 constitutes a part of a virtual spherical surface that continuously integrates with the lower end of the peripheral wall portion 14 of the container 30 and protrudes downward with a radius of curvature of about 10 to 30 mm. Since the bottom surface portion 11 includes the curved surface portion 32, the direct blow molded container 30 of the present reference example has a structure rich in internal pressure resistance.
[0021]
The support leg 33 is formed by projecting downward an arcuate portion located on both sides of the bottom surface portion 31 having a circular planar shape and sandwiching the central belt-like curved surface portion 32. While being connected and integrated with the peripheral wall portion 14 of the container 30 via the curved corner portion, the inner straight portion thereof is connected and integrated with the curved surface portion 32 via the inclined side wall surface 36. In the center of the support leg 33, a parting surface 35 is extended so as to be divided into two equal parts, and both side portions sandwiching the parting surface 35 further protrude downward, for a total of 4 When the molding container 30 is erected and placed, the contact portion 40 is brought into contact with the grounding surface and the curved surface portion 32 is not brought into contact with the grounding surface. Thus, the molded container 30 can be made independent.
[0022]
In addition, as described above, all the line segments 38 from the center 37 side of the bottom surface portion 31 passing through the side wall surface 36 of the support leg portion 33 toward the outside in the horizontal direction are angle θ from the curved surface portion 32 side with respect to the partition surface 35. Since 'is 90 degrees or more when the bottom surface portion 31 is viewed in plan from below, the molding container 30 can be smoothly extracted from the pair of molds in the direct blow molding.
[0023]
That is, the direct blow molded container of this reference example is also excellent in internal pressure resistance and self-supporting property, and can be easily formed by direct blow molding.
[0024]
The present invention can be variously modified without being limited to the first embodiment. For example, the shape of the bottom surface portion is not limited to that of the first embodiment, and all line segments from the center side of the bottom surface portion passing through the side wall surface of the support leg portion toward the outside in the horizontal direction are parting surfaces. Various shapes in which the support leg portion is formed so that the angle from the curved surface portion side to 90 ° or more can be employed. The direct blow molded container of the present invention can also be used as a container for storing not only liquid cosmetics but also other contents.
[0025]
【The invention's effect】
The direct blow molded container of the present invention is excellent in internal pressure resistance and self-supporting properties, and can be easily formed by direct blow molding.
[Brief description of the drawings]
FIG. 1A is a side view of a direct blow molded container according to a first embodiment of the present invention, and FIG. 1B is a side view of the direct blow molded container of FIG.
2 (a) is an enlarged view of the bottom of FIG. 1 (b), and FIG. 2 (b) is an enlarged view of the bottom of FIG. 1 (a) rotated 45 degrees.
FIG. 3 is an enlarged perspective view of the bottom of the direct blow molded container according to the first embodiment of the present invention.
4A is a side view of a direct blow molded container according to a reference example, and FIG. 4B is a side view of the direct blow molded container of FIG. 4A rotated by 90 degrees.
5 (a) is an enlarged view of the bottom of FIG. 5 (b), and FIG. 5 (b) is an enlarged view of the bottom of FIG. 5 (a).
FIG. 6 is an enlarged perspective view of a bottom part of a direct blow molded container according to a reference example .
[Explanation of symbols]
10, 30 Direct blow molded container 11, 31 Bottom surface portion 12, 32 Curved surface portion 13, 33 Support leg portion 14 Peripheral wall portion 16, 34 Part line surface 17, 35 Parting surface 18 Center line 19, 36 of support leg portion Side wall surfaces 20 and 37 of the supporting leg portions Centers 21 and 38 of the bottom surface portion Line segment 40 Abutting portions θ and θ ′ Angles with respect to the parting surface

Claims (3)

A direct blow molded container that is molded by direct blow molding, and includes a curved surface portion and a support leg portion for standing a container disposed so as to sandwich the curved surface portion on the bottom surface portion,
The curved surface portion constitutes a part of a virtual spherical surface that protrudes downward and is continuously integrated with the lower end of the peripheral wall portion of the container body, and the support leg portion is interposed between the adjacent curved surface portions. , Both sides are sandwiched between the supporting legs and divided in the circumferential direction,
A central curved surface part that constitutes a part of the spherical surface is also provided to be exposed downward in the circular area in the center of the bottom surface part,
All the line segments from the center side of the bottom surface portion passing through the side wall surface of the support leg portion connected to the curved surface portion toward the outside in the horizontal direction have an angle from the curved surface portion side with respect to the parting surface by the direct blow molding. The support leg is formed to be 90 degrees or more in plan view of the bottom surface ,
And the said support leg part is a direct blow molding container provided so that the lower end part may be located below the said center curved surface part by the height which can be forcibly removed in direct blow molding.   The curved surface portion is provided in four radial positions so that the center line thereof is positioned at 45 degrees with respect to the parting surface, and the support leg portion has a center line of 0 with respect to the parting surface. The direct blow molded container according to claim 1, which is provided at four locations radially so as to be at positions of degrees and 90 degrees. 3. The support leg portion is a substantially quadrangular pyramid-shaped protruding portion that is interposed between the adjacent curved surface portions and protrudes obliquely downward from the spherical surface, the ridgeline being curved without being angular. The direct blow molded container as described.

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