JP5156365B2 - Plastic bottle - Google Patents

Description

  The present invention relates to improvements in plastic bottles.

  Plastic bottles are used as bottle containers for storing liquid products such as shampoos, rinses, body soaps, kitchen detergents, liquid clothing detergents, softeners, etc. Widely used in products (for example, see Patent Documents 1 to 3).

  The plastic bottle is generally made of a synthetic resin material formed into a bottle shape by blow molding (blow molded product). Specifically, for manufacturing this plastic bottle, a method is used in which a cylindrical molding material called a parison is melted, placed in a mold, blown into the interior to be inflated, and simultaneously cooled and molded.

  Some plastic bottles are equipped with a cap called a push-pull cap. This push-pull cap can open and close the spout of the cap by pushing (pushing) and pulling (pull). It is possible.

By the way, in a plastic bottle equipped with such a push-pull cap, when an impact such as dropping is applied, the cap may rise due to the repulsion, and the content liquid in the bottle may leak to the outside. It was. In particular, as the remaining amount of the content liquid in the bottle increases, the cap is more likely to lift due to impact, and thus an improvement is desired.
Registered Utility Model No. 3121032 Registered Utility Model No. 3111841 JP 60-35008 A JP-A-56-150714 JP-A-57-35205

  The present invention has been proposed in view of such a conventional situation, and even when an impact due to dropping or the like is applied, such an impact can be efficiently absorbed, and the content liquid leaks to the outside. It aims at providing the plastic bottle which prevented that.

In order to achieve this object, the invention according to claim 1 includes at least a bottom portion, a trunk portion having a circular cross-section standing up from the outer periphery of the bottom portion, and a cylindrical portion from an upper end of the trunk portion having a reduced diameter. A plastic bottle having a container body having a mouth-and-neck portion standing upright and having a push-pull cap attached to the mouth-and-neck portion of the container body. The bottom portion is provided with a concave portion whose central portion protrudes toward the inside of the container body and a ring-shaped leg portion surrounding the concave portion, and a push-pull cap is provided on the bottom surface of the leg portion . Two or three protrusions for preventing lifting due to an impact are provided on the inner side of the outermost periphery of the leg, so that the protrusions have different lengths and intervals in the circumferential direction. Over a range of angles With kicked, the spacing between the protrusions adjacent in the circumferential direction is a plastic bottle, wherein at least 60 ° or more.

As described above, in the plastic bottle according to the present invention, even when an impact due to dropping or the like is applied, it is possible to efficiently absorb the impact as it. In particular, in a plastic bottle equipped with a push-pull cap, it is possible to prevent the cap from being lifted due to an impact such as dropping, so that the content liquid can be prevented from leaking to the outside.

Hereinafter, a bottle container to which the present invention is applied will be described in detail with reference to the drawings.
The bottle container to which the present invention is applied is, for example, a plastic bottle 1 as shown in FIGS.

  The plastic bottle 1 includes a container body 2, which includes a bottom portion 3, a body portion 4 that rises in a cylindrical shape from the outer periphery of the bottom portion 3, and a shoulder portion that is gradually reduced in diameter at the upper end of the body portion 4. 5 and a mouth and neck portion 6 erected in a cylindrical shape from the upper end of the shoulder portion 5.

  The container body 2 is made of a synthetic resin material such as polyethylene resin, polypropylene resin, or polyester resin. For the production of the container body 2, for example, a cylindrical molding material called a parison is melted, put into a mold, and inflated by blowing air inside, as in direct blow molding or biaxial stretch blow molding. Blow molding that cools and molds at the same time is used.

  As shown in FIG. 3, the bottom 3 has a schematic shape that is a perfect circle when the container body 2 is viewed from the bottom side. In addition, the bottom 3 is provided with a recess 7 whose central portion is raised toward the inside of the container body 2 and a ring-shaped leg 8 surrounding the periphery of the recess 7.

  The trunk | drum 4 comprises the outer periphery of the container main body 2 from the bottom part 3 to the shoulder part 5, as shown in FIG.1 and FIG.2. The outer shape of the body portion 4 has a long cylindrical shape that is gradually reduced in diameter from the bottom portion 3 to reach the shoulder portion 5 when the container body 2 is viewed from the front side. That is, the cross-sectional shape of the body part 4 is substantially circular.

  The shoulder portion 5 constitutes the outer periphery of the container body 2 from the trunk portion 4 to the mouth neck portion 6. The mouth / neck portion 6 has a cylindrical shape in the upper center of the container body 2. A push-pull cap 9 is attached to the mouth / neck portion 6.

  At the upper end of the push-pull cap 9, a spout 9 a for pouring the content liquid stored in the container body 2 is provided. The push-pull cap 9 can open the spout 9a by pulling the push-pull cap 9 itself (pull operation), and close the spout 9a by pushing (push operation).

  Incidentally, as shown in FIG. 4, protrusions 10 a and 10 b having different circumferential lengths are provided on the bottom surface of the leg portion 8. Specifically, the bottom surface of the leg 8 is provided with a first projection 10a over an angle range of 120 ° and a second projection 10b over an angle range of 60 °. In addition, the distance between the first protrusion 10a and the second protrusion 10b is set in an angular range in which one side is 60 ° and the other is 120 ° so that it can easily fly sideways when dropped. Yes. Further, the first protrusion 10 a and the second protrusion 10 b are provided inside the outermost periphery of the leg 8.

  In the plastic bottle 1 having the above structure, even when an impact due to dropping or the like is applied, by providing the first and second protrusions 10a and 10b having different lengths in the circumferential direction at the bottom of the leg 8, Such an impact can be absorbed efficiently. Specifically, when the plastic bottle 1 having a circular horizontal sectional shape falls vertically, the impact due to the repulsion acts on the push-pull cap 9 directly from the bottom 3, and the push-pull cap 9 may be opened. However, in the case of the present invention, the impact of the repulsion can be reduced by the plastic bottle 1 that has fallen jumped in the direction deviating from the vertical direction (jumped sideways).

  Therefore, in the plastic bottle 1 to which the push-pull cap 9 is attached, it is possible to prevent the cap from being lifted by an impact such as dropping, and it is possible to prevent the content liquid from leaking to the outside. Yes.

  The bottle container to which the present invention is applied is not necessarily limited to the configuration of the plastic bottle 1 described above, and various modifications can be made without departing from the spirit of the present invention.

  That is, in the plastic bottle to which the present invention is applied, even when an impact due to dropping or the like is applied, by providing at least two protrusions 10a and 10b having different circumferential lengths at the bottom of the leg 8, It is possible to efficiently absorb a strong impact.

  In addition, the interval between the protrusions 10a and 10b adjacent in the circumferential direction is preferably at least 60 ° or more, and the interval between the protrusions 10a and 10b is preferably different in the circumferential direction. The first and second protrusions 10a and 10b may have a shape and dimensions that do not deform due to an impact such as dropping.

  In addition, the plastic bottle to which the present invention is applied can be widely used as a container for liquid products for daily goods, beverages, foods, etc., and as a liquid (content liquid) stored inside. Examples include liquid products such as shampoos and rinses, body soaps, kitchen detergents, liquid clothing detergents, and softeners.

  Hereinafter, the effects of the present invention will be made clearer by examples. In addition, this invention is not limited to a following example, In the range which does not change the summary, it can change suitably and can implement.

  In this example, a plastic bottle with a push-pull cap similar to the embodiment shown in FIG. 1 is produced, and a protrusion having a different length in the circumferential direction is provided on the bottom of the container body (Examples 1 to 5). ), And the case where no protrusion is provided (Comparative Example 1) and the case where a protrusion having the same circumferential length is provided (Comparative Examples 2 and 3).

In addition, the plastic bottles of Examples 1 to 5 and Comparative Examples 1 to 3 each have a concave portion whose bottom central portion is raised toward the inside of the container body, and a ring-shaped leg portion surrounding the concave portion. The leg portion has an outer diameter of 23.5 mm, an inner diameter of 20.0 mm, and a width of 3.5 mm.
There are three types of protrusions: large (length 18.4 mm, width 2.6 mm), medium (length 6.9 mm, width 2.6 mm), and small (length 4.6 mm, width 2.6 mm). In Example 5, large (120 ° angle range), small (60 ° angle range), and spacing (large and small, one 60 °, the other 120 ° angle range), and the bottom of each plastic bottle Appearance shapes are shown in FIGS.

  In addition, as for the impact of the drop impact, the impact force (kgf) applied to the container body when each plastic bottle is dropped vertically from a height of 1 m, the container body when it jumps up to a height of 10 mm due to the drop impact The angle of inclination (°), the time (seconds) required for the bottom of the container body to jump up to a height of 10 mm, and the presence or absence of cap lifting were examined. Table 1 below summarizes these.

As shown in Table 1, the plastic bottles of Examples 1 to 5 are cases where protrusions having different lengths in the circumferential direction are provided on the bottom of the container body, and any plastic bottles fly sideways when dropped. As a result, it was possible to prevent the impact due to repulsion from acting directly on the cap and to prevent the cap from floating.
On the other hand, the plastic bottle of Comparative Example 1 is a case where no protrusion is provided on the bottom of the container body, and when it drops, the impact due to the repulsion acts directly on the cap and the cap floats. did.
On the other hand, the plastic bottles of Comparative Examples 2 and 3 are cases in which a protrusion having the same circumferential length is provided on the bottom of the container body, and in this case as well, the impact caused by repulsion is capped by jumping up in the vertical direction when dropped. The cap floated occasionally.

FIG. 1 is a front view showing an example of a plastic bottle to which the present invention is applied. FIG. 2 is a front view showing the container body of the plastic bottle shown in FIG. FIG. 3 is a perspective view of the container body of the plastic bottle shown in FIG. 1 as seen from the bottom side. FIG. 4 is a bottom view of the container body of the plastic bottle shown in FIG. FIG. 5 is a perspective view of each plastic bottle shown in the embodiment as seen from the bottom side.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Plastic bottle 2 ... Container main body 3 ... Bottom part 4 ... Trunk part 5 ... Shoulder part 6 ... Mouth-and-neck part 7 ... Recessed part 8 ... Leg part 9 ... Push-pull cap 10a ... First protrusion part 10b ... Second protrusion part

Claims (1)

A container main body having at least a bottom, a barrel having a circular cross-section standing upright from the outer periphery of the bottom, and a mouth-and-neck standing up in a cylinder from the reduced diameter upper end of the barrel In addition, the container body is formed by blow molding a synthetic resin material, and a plastic bottle in which a push-pull cap is attached to the neck portion of the container body ,
The bottom portion is provided with a concave portion whose central portion is raised toward the inside of the container body, and a ring-shaped leg portion surrounding the periphery of the concave portion,
On the bottom surface of the leg portion, two or three protrusions for preventing lifting due to the impact of the push-pull cap are provided on the inner side of the outermost periphery of the leg portion ,
The protrusions are provided over a predetermined angular range so that the circumferential length and interval are different, and the interval between adjacent protrusions in the circumferential direction is at least 60 ° or more. Plastic bottle.

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