JP2002114214A - Direct blow-molded vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct blow-molded vessel which can be easily manufactured by the direct blow molding, and has excellent resistance against internal pressure and self-standing property. SOLUTION: This direct blow-melded vessel 10 is molded by the direct blow molding, and has curved surface parts and support leg parts 13 on a bottom surface part 11 thereof. The support leg parts 13 are formed so that all line segments 21 directed outwardly in the horizontal direction from a center side of the bottom surface part 11 passing through a side wall surface 19 of the support leg parts 13 connected to the curved surface parts 12 form an angle of >=90 deg. from the curved surface parts 12 with respect to a parting surface 17 with the bottom surface part 11 viewed in plan. Four curved surface parts 12 are provided in a radial direction so that the axis 16 is at the position of 45 deg. with respect to the parting surface 17, and four support leg parts 13 are provided in a radial direction so that the axis 18 is at the position of 0 deg. and 90 deg. with respect to the parting surface 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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-sustainability.

[0002]

2. Description of the Related Art Plastic containers formed by blow molding such as direct blow molding and injection blow molding are widely used as preferable containers 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 at the time of hitting a surrounding object, and generates a pressurized fluid or gas. When containing a fluid, it is necessary to provide sufficient internal pressure resistance.

In order to make a plastic container having a structure excellent in internal pressure resistance, it is effective to make the cross-sectional shape of the container circular or nearly circular so that the peripheral wall surface has an arc shape and the bottom surface has a curved shape. However, if the entire bottom surface is curved, the container cannot maintain its independence. For this reason, a plurality of support legs are projected downward from the bottom surface, and the support legs are brought into contact with the ground contact surface so that the container is erected. I have.

A plastic container for a pressurized fluid having both internal pressure resistance and self-sustainability by forming the bottom surface portion of the container with a curved surface portion and a support leg portion is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 4
No. 215936. However, since this plastic container is formed by injection blow molding and has a complex uneven surface with a deep bottom surface, a pair of molds joined via a parting surface is used. When forming by direct blow molding, it was difficult to pull out the mold on both sides. In other words, conventional plastic containers with excellent internal pressure resistance and self-sustainability are formed by injection blow molding using a special mold at the bottom part, and are used for manufacturing small-quantity multi-type plastic containers. It did not have a configuration that could be formed by suitable direct blow molding.

[0005] An object of the present invention is to provide a direct blow molded container which can be easily formed by direct blow molding and has excellent internal pressure resistance and self-sustainability.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a curved portion formed by direct blow molding, a bottom surface portion thereof, and a supporting leg portion for erecting a container protruding from the curved surface portion. In a direct blow-molded container, all the line segments extending from the center of the bottom portion to the outside in the horizontal direction from the center side of the bottom portion passing through the side wall surface of the support leg portion connected to the curved surface portion, with respect to the parting surface by the direct blow molding. The angle from the curved surface side is 90 when viewed from above the bottom surface portion.
The object has been achieved by providing a direct blow-molded container having the support leg portion formed so as to have a degree equal to or higher than that.

Here, the line segment passing through the side wall surface of the support leg portion is a line segment that can be drawn on the side wall surface, and corresponds to a horizontal surface when the direct blow molding container is erected. Means a line segment extending from the center side of the bottom portion to the outside. Also, the angle of the line segment from the spherical surface side with respect to the parting surface by the direct blow molding is an angle in the extension direction of the line segment when the line segment is a straight line, and when the line segment is a curve. Means an angle in each tangential direction at an arbitrary position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A direct blow molded container 10 according to a first preferred embodiment of the present invention shown in FIGS.
Is a plastic container formed by direct blow molding for accommodating a liquid cosmetic that generates a considerable internal pressure by generating gas, for example, and has a curved surface portion 12 and a curved surface portion And a support leg 13 protruding downward with the support 12 interposed therebetween.

The direct blow molded container 10 of the first embodiment is made of PE (polyethylene), and the peripheral wall 14 of the container body has a diameter of about 50 mm and a height of 140 mm.
A mouth-neck portion 15 having a cylindrical shape and having an external thread is provided at the upper end thereof. In addition, the direct blow molded container 10 is expanded by extruding a parison into a hollow portion formed by a pair of molds (not shown) joined via the parting surface 17 and sending air into the parison. And then solidified by cooling, and after molding, it is removed by pulling out a pair of molds on both sides.

According to the direct blow molded container 10 of the first embodiment, the curved surface portion 12 constituting the bottom surface portion 11 is provided.
The center line 16 is 45 degrees from the parting surface 17 by direct blow molding (the surface through which the parting surfaces of the pair of dies pass) when the bottom surface portion 11 is viewed from below.
The support leg 13 has a center line 18 with respect to the parting surface 17 at 0 ° and 90 ° when the bottom surface 11 is viewed from below. Four locations are provided radially to come to the position.

Further, a support leg 13 connected to the curved surface 12
All the line segments 21 extending from the center 20 side of the bottom surface portion 11 passing through the side wall surface 19 to the outside in the horizontal direction have an angle θ from the curved surface portion 12 side to which the side wall surface 19 is connected to the particle surface 17. The support leg 13 is formed such that the angle is 90 degrees or more when viewed from below in a plan view.

The curved surface portion 12 is continuously integrated with the lower end of the peripheral wall portion 14 of the container 10 and constitutes a part of a virtual spherical surface projecting downward with a radius of curvature of about 10 to 30 mm. Since the support leg 13 is interposed between the portions 12, the support leg 13 is sandwiched on both sides to be divided into four in the circumferential direction. The spherical surface is also exposed downward as a central curved surface portion 22 in a central circular region having a diameter of about 12 mm of the bottom surface portion 11.

That is, the direct blow molded container 10 of the first embodiment has the curved surface portion 1
By having 2, 22, a structure rich in internal pressure resistance is provided.

The support leg 13 is a substantially quadrangular pyramid-shaped protruding portion which is interposed between the adjacent curved surface portions 12 and protrudes obliquely downward from the spherical surface. The lower end portion is provided so as to be located below the central curved surface portion 22 by a height that allows forcible removal in direct blow molding. Thereby, the molding container 10
When the robot is placed upright, the lower ends of the four support legs 13 are brought into contact with the grounding surface, so that the spherical portions 12, 22 can be self-standing in a stable state without contacting the grounding surface. Become.

The support legs 13 each having a substantially quadrangular pyramid shape include:
One surface 23 on the center side is connected and integrated with the central curved surface portion 22 with a gentle gradient, and one surface 24 on the outer side is connected and integrated with the peripheral wall portion 14 with a steep gradient. The side wall surfaces 19 on both sides are
As described above, all the line segments 21 extending in the horizontal direction from the center 20 side of the bottom surface portion 11 passing through the side wall surface 19 are connected to and integrated with the curved surface portions 12 on both sides as inclined surfaces. The angle θ from the curved surface portion 12 side to the parting surface 17 is 90 degrees or more when the bottom surface portion 11 is viewed from below in a plan view. Accordingly, when the pair of dies is pulled out sideways to form the direct blow molded container 10 by the direct blow molding, the support leg 13 does not hinder the movement of the dies, so that the molded container 10 It becomes possible to extract smoothly from the mold.

That is, the direct blow molded container of the first embodiment is excellent in internal pressure resistance and self-sustainability,
It can also be easily formed by direct blow molding.

FIGS. 4 to 6 show a direct blow molding container 30 according to a second preferred embodiment of the present invention. The molding container 30 according to the first embodiment except for a bottom portion 31 is shown. It has the same configuration as the direct blow molding container 10.

The bottom portion 31 of the direct blow molded container 30 according to the second embodiment includes a curved surface portion 32 and support legs 33 projecting downward with the curved surface portion 32 interposed therebetween. The center line 34 extends in the form of a band with a width of about 10 mm across the center of the bottom surface portion 31 so that the center line 34 is at a position of 90 degrees with respect to the parting surface 35, and is provided at one location. Further, a pair of support legs 33 are provided on both sides of the curved surface portion 32 so as to protrude downward.

According to the second embodiment, the curved portion 3
Bottom surface portion 3 passing through side wall surface 36 of support leg portion 33 connected to
All line segments 3 from the center 37 side of 1 toward the outside in the horizontal direction
8 is a support leg portion 33 such that the angle θ ′ from the spherical surface portion 32 side to which the side wall surface 36 is connected to the parting surface 35 is 90 ° or more when the bottom surface portion 31 is viewed from below.
Are formed.

The curved portion 32 is formed on the peripheral wall 1 of the container 30.
4 and constitutes a part of a virtual spherical surface that protrudes downward with a radius of curvature of about 10 to 30 mm by being continuously integrated with the lower end. Since the bottom portion 11 has the curved portion 32, the direct blow molded container 30 of the second embodiment is provided.
Has a structure rich in internal pressure resistance.

The support leg portion 33 is provided by projecting downwardly from the bottom portion 31 having a circular planar shape, arcuate portions located on both sides of the central band-shaped curved surface portion 32. The arc-shaped portion is connected and integrated with the peripheral wall portion 14 of the container 30 through the curved corner portion, and the inner straight portion is connected and integrated with the curved surface portion 32 through the inclined side wall surface 36, respectively. At the center of the support leg 33, a parting surface 35 extends so as to divide the support leg 33 into two equal parts, and both side portions sandwiching the parting surface 35 project further downward, for a total of 4 parts. A plurality of contact portions 40. When the molding container 30 is placed upright, the contact portions 4
In this case, the molded container 30 can be self-supported in a stable state without the curved surface portion 32 being in contact with the ground surface by contacting the zero with the ground surface.

Further, as described above, all the line segments 38 extending from the center 37 side of the bottom surface portion 31 passing through the side wall surface 36 of the support leg portion 33 to the outside in the horizontal direction are from the curved surface portion 32 side to the particle surface 35. Is 90 degrees or more when the bottom surface portion 31 is viewed from below in a plan view, the molding container 30 can be smoothly extracted from the pair of dies in the direct blow molding.

That is, the direct blow molded container of the second embodiment also has excellent internal pressure resistance and self-sustainability, and can be easily formed by direct blow molding.

The present invention can be variously modified without being limited to the above embodiment. For example, the shape of the bottom portion is not limited to those of the above embodiments, and all line segments extending from the center side of the bottom portion passing through the side wall surface of the support leg toward the horizontal outside with respect to the parting surface. Various shapes having support legs formed so that the angle from the spherical surface side is 90 degrees or more can be adopted.
Further, the direct blow molded container of the present invention can be used as a container for accommodating not only liquid cosmetics but also other contents.

[0025]

The direct blow molded container of the present invention is
It has excellent internal pressure resistance and self-sustainability, 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.

FIG. 2A is an enlarged bottom view of FIG. 1B, and FIG.
FIG. 1B is an enlarged bottom view obtained by rotating FIG. 1A by 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.

FIG. 4A is a side view of a direct blow molded container according to a second embodiment of the present invention, and FIG. 4B is a side view of the direct blow molded container of FIG.

FIG. 5A is an enlarged bottom view of FIG. 5B, and FIG.
6 is an enlarged bottom view of FIG.

FIG. 6 is an enlarged perspective view of a bottom portion of a direct blow molded container according to a second embodiment of the present invention.

[Explanation of symbols]

 10, 30 Direct blow molding container 11, 31 Bottom part 12, 32 Curved surface part 13, 33 Support leg part 14 Peripheral wall part 16, 34 Center line of spherical part 17, 35 Parting surface 18 Center line of support leg part 19, 36 Side wall surface of supporting leg portion 20, 37 Center of bottom portion 21, 38 Line segment 40 Contact portion Angle of θ, θ 'line to parting surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuko Tamiya 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Prefecture Inside the Kao Research Institute (72) Inventor Tetsuya Kobayashi 2-1-3 Bunka, Sumida-ku, Tokyo Kao Corporation F-term in the laboratory (reference) 3E033 AA02 BA15 CA05 DA03 DB01 DD05 EA01 FA03 GA02 4F208 AG07 AG23 AG28 AH55 AR07 LA01 LB01 LG15 LG22 LG34 LG37 LG38 LJ09

Claims (3)

[Claims] (1) molding by direct blow molding;
A direct blow-molded container having a curved surface portion on its bottom surface, and a support leg for erecting a container protrudingly arranged with the curved surface portion interposed therebetween, wherein the side of the support leg portion connected to the curved surface portion is provided. All the line segments extending from the center side of the bottom portion passing through the wall surface 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 of 90 degrees or more when the bottom surface portion is viewed in plan. A direct blow-molded container in which the support leg is formed. 2. The curved surface portion is provided at four radial positions so that the center line thereof is at a position of 45 degrees with respect to the parting surface, and the support leg portion has the center line of the parting line. 2. The direct blow-molded container according to claim 1, wherein the container is provided at four radial positions so as to be located at 0 and 90 degrees with respect to the plane. 3. The curved surface portion extends in a strip shape, and is provided across the center of the bottom surface portion so that the center line thereof is at a position of 90 degrees with respect to the parting surface. The direct blow molded container according to claim 1, wherein the support legs are provided on both sides of the spherical portion.