JPH09255009A - Liquid container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid container composed of a container body and a cap in which the cap can be easily fitted to the container body and liquid leakage is hardly brought in the container body and further, crack and damage of the opening of the container body hardly arise even if the cap has been fitted to the container body for a long time. SOLUTION: This liquid container is constituted of a container body 1 and a cap 3. The container body 1 is provided with a folding-back part 2a turning to the inside, at the opening 2. An inner core 4 is protruded in the inside of the cap 3. The inner core 4 is provided with a fitting part 41 having a larger outer diameter by 0.1-0.4mm than the inner diameter of the folding-back part 2a at a position near the basal part and fitting to the folding-back part 2a, a widened part 42 connecting to the fitting part 41 and having a larger outer diameter by 0.1-0.3mm than the outer diameter of the fitting part 41, and a tapered front end 43 at the outer face.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid container including a container body and a cap.

[0002]

2. Description of the Related Art Conventionally, in a capped liquid container, the shape of the fitting portion between the cap and the container body for preventing leakage of the liquid in the container is as shown in FIGS. The mouth portion 20 of the container body 10 is provided by recessing inwardly in a funnel shape whose inner diameter is narrowed as it goes downward, and at the center of the inside of the head of the cap 30, a downwardly projecting long end is formed. A shape is proposed in which a core 40 is provided, and the outer diameter of the inner core 40 is larger than the inner diameter of the narrowed portion of the recessed portion of the mouth portion 20 (Actual No. Sho 56-56).
343). Further, as shown in FIGS. 6 and 7, an inner core 40 is provided on the inner surface of the head of the cap 30, and the inner core 40 is attached to the mouth 20 when the cap 30 is attached to the mouth 20 of the container body 10. It is a hollow cylindrical body which is tapered so that it can be fitted, and further, a slit 40a is provided in the axial direction thereof, and a bulged portion having a diameter larger than the diameter of the mouth portion 20 is provided on the outer peripheral side. Some have also been proposed (see Japanese Utility Model Laid-Open No. 1-128551).

[0003]

As described above, in the capped liquid container, the shape of the fitting portion between the cap and the container body for preventing the liquid in the container from leaking is generally the same as that of the container body. A method is adopted in which the outer diameter of the inner core of the cap is made larger than the inner diameter of the mouth portion to increase the fitting strength and airtightness. However, there is a problem in that the cap does not come off easily if the fitting strength is simply increased, or if the cap or the mouth of the container body is cracked or damaged when the cap is fitted for a long period of time. .

The present invention solves the above-mentioned problems, and an object thereof is a liquid container comprising a container body and a cap, which can be easily attached to the container body, It is an object of the present invention to provide a liquid container which does not leak liquid and in which the mouth portion of the container body does not crack or break due to long-term fitting of the container body and the cap.

[0005]

A liquid container according to the present invention is a liquid container comprising a container body and a cap, the container body having an inwardly folded portion at its mouth,
The cap has an inner core projecting from the inside thereof, and the inner core has a diameter of 0.1 mm or less than the inner diameter of the folded portion in the vicinity of the base.
A fitting portion having an outer diameter larger by 0.4 mm and fitted to the folded portion, and an outer diameter connected to the fitting portion and larger by 0.1 mm to 0.3 mm than the outer diameter of the fitting portion. It is characterized in that the expanded diameter portion and the outer surface thereof are provided with a tip portion that is tapered toward the tip.

Hereinafter, the present invention will be described with reference to the drawings.
1 to 3 are cross-sectional views showing an example of the liquid container of the present invention, FIG. 1 shows the vicinity of the mouth of the container body, FIG. 2 shows a cap, and FIG. 3 shows the fitting between the container body and the cap. It shows the state.

The container body 1 is provided at its mouth 2 with a folded-back portion 2a directed inward. The inner diameter of the folded-back portion 2a is equalized from the vicinity of the mouth portion 2 to the tip portion located inside the container body 1. As described above, it is preferable that the inner diameters of the folded-back portions 2a are made equal to each other, since the folded-back portions 2a are easily air-tightly fitted to the fitting portions 41 described later. The tip may be slightly smaller than the vicinity of 2.
It is preferable that the length of the folded-back portion 2a is equal to the length of the fitting portion 41 to be described later because the folded-back portion 2a and the fitting portion 41 can be easily fitted in an airtight manner, but even if the length is shorter than the fitting portion 41. The length may be such that the effect of the present invention that "the liquid in the container body does not easily leak" is exhibited.

The cap 3 shown in FIG. 2 has an inner core 4 projecting from the inside thereof, and the inner core 4 is fitted near the base of the inner core 4 so as to be fitted into the folded-back portion 2a of the container body 1. Part 4
1. A connecting member 41 is provided with an enlarged diameter portion 42 having an outer diameter larger than the outer diameter of the fitting portion, and a tip portion 43 having an outer surface tapered toward the tip. .

When the outer diameter of the fitting portion 41 is small, the fitting strength with the folded portion 2a is small, and the liquid in the container body 1 is easy to leak, and when it is large, the container is fitted with the cap 3 for a long time. Since the mouth portion 2 of the main body 1 is likely to be cracked or damaged, it is necessary to make the outer diameter 0.1 to 0.4 mm larger than the inner diameter of the folded portion 2a.

When the outer diameter of the enlarged diameter portion 42 becomes smaller,
When the fitting portion 41 and the folded-back portion 2a are loosely fitted to each other when the liquid container is used, the effect of closing the folded-back portion 2a by the expanded diameter portion 42 becomes small, and the liquid in the container body 1 easily leaks, When the size is increased, when the cap 3 is fitted to the container body 1, the force for pushing and expanding the folded-back portion 2a becomes too strong, and the folded-back portion 2a and the mouth portion 2 of the container body 1 are easily cracked or damaged. It is necessary that the outer diameter of the fitting portion 41 is 0.1 to 0.3 mm larger than that of the fitting portion 41.

In the cap 3 of FIG. 2, a hollow portion 44 is formed in the inner core 4. When the hollow portion 44 is formed in this way, the tip end of the tip end portion 43 of the inner core 4 is opened, so that when the inner core 4 is fitted into the folding portion 2a, the expanded diameter portion 42 is folded back. The effect that the portion 2a can easily pass smoothly is exhibited. However, the formation of the hollow portion 44 is not essential in the present invention.

The shape of the container body 1 of the liquid container of the present invention is not particularly limited, and for example, one having a uniform outer diameter from the mouth to the bottom; one having a bulge at the bottom, etc. Is mentioned.

The material of the liquid container of the present invention is not particularly limited, but a thermoplastic resin is preferable from the viewpoint of easy operation when a material having a little flexibility at the time of fitting and moldability during manufacturing. , For example, polyethylene is preferred.

The method for producing the liquid container of the present invention is not particularly limited, but it is produced, for example, by blow molding using a thermoplastic resin such as polyethylene.

In the method of using the liquid container of the present invention, after the liquid is put into the container body 1, the cap 3 is inserted into the folded portion 2a of the mouth 2 of the container body 1 from the tip 43 of the inner core 4. This is performed by pushing the folded-back portion 2a so as to push it open at the expanded diameter portion 42, and then fitting the fitting portion 41 and the folded-back portion 2a.

(Operation) The liquid container of the present invention is provided with the cap 3
The fitting portion 41 of the inner core 4 of the container is the folded portion 2a of the container body 1.
Since the enlarged diameter portion 42 having a larger outer diameter is provided so as to be connected with the fitting portion 41, the expansion portion 42 is provided even if the fitting portion 41 and the folded-back portion 2a are loosely fitted. Since the diameter portion 42 closes the folded portion 2a, the liquid content of the liquid container does not leak to the outside. Further, the fitting portion 41 and the enlarged diameter portion 42 of the inner core 4 of the cap 3 having an outer diameter larger than the inner diameter of the folding portion 2a provide high fitting strength to prevent liquid leakage, and the folding portion 2a is made of the same material. The rigidity of the container plays a role of a cushion, so that the opening 2 of the container body 1 is prevented from being cracked or damaged. Further, when the length of the folded-back portion 2a is made equal to the length of the fitting portion 41 of the inner core 4 of the cap 3,
The fitting is fixed at a predetermined position so that the fitting can be made with a clicking sound so that the fitting end is clear and the fitting is more airtight.

[0017]

Next, embodiments of the present invention will be described. (Example 1) A liquid which uses a polyethylene resin and which comprises a container body 1 having a shape near the mouth portion 2 shown in FIG. 1 and a cap 3 shown in FIG. 2 and which shows a fitted state shown in FIG. The container was manufactured. A bulge is formed on the bottom of the container body 1 of the liquid container (not shown), and the liquid container contains a 50 wt% glycerin aqueous solution and is used as an enema container. The container body 1 in FIG.
The outer diameter of the mouth portion 2 was 6.1 mm, the inner diameter of the folded portion 2a was 2.7 mm, and the length of the folded portion 2a was 1.8 mm. 2, the outer diameter of the fitting portion 41 of the inner core 4 of the cap 3 is 3.05 mm, and the length of the fitting portion 41 is 1.8.
mm, the maximum outer diameter of the expanded portion 42 is 3.25 mm, the expanded portion 4
2 has a length of 1.6 mm, and the tip 43 has a length of 3.0 m.
The inner diameter of the hollow portion 44 was 1.5 mm.

Performance Evaluation 100 liquid containers of Example 1 were manufactured, and 5 liquid containers were prepared.
Container body 1 containing 0% by weight glycerin aqueous solution
The cap 3 was fitted to the above, the cap 3 was laid down, and left standing in an atmosphere at a temperature of 40 ° C. and a relative humidity of 75% for 3 months, as a result of a durability test. As a result, in any liquid container, liquid leakage and container body No crack was generated in the mouth 2 of No. 1.

[0019]

The structure of the present invention is as described above. According to the present invention, the cap can be easily attached to the container body, the liquid in the container body does not leak, and the container body and the cap can be separated from each other. There is provided a liquid container in which the mouth portion of the container body is not cracked or damaged due to long-term fitting.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the vicinity of a mouth portion of a container body of an example of a liquid container of the present invention.

FIG. 2 is a sectional view of a cap of an example of the liquid container of the present invention.

FIG. 3 is a cross-sectional view showing a fitted state of a container body and a cap of an example of a liquid container of the present invention.

FIG. 4 is a cross-sectional view showing the vicinity of the mouth of the container body of the conventional liquid container.

FIG. 5 is a cross-sectional view showing a fitted state of a container body and a cap of a liquid container of a conventional example.

FIG. 6 is a sectional view showing a fitted state of a container body and a cap of another conventional liquid container.

FIG. 7: VII-VII about the cap only in FIG.
It is a line sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Mouth part 2a Folding part 3 Cap 4 Inner core 41 Fitting part 42 Expanding part 43 Tip part 44 Hollow part

Claims (1)

[Claims] 1. A liquid container comprising a container main body and a cap, wherein the container main body is provided with a folded-back portion directed inward at its mouth, and the cap has an inner core projecting inside thereof. The inner core has an outer diameter in the vicinity of its base portion that is 0.1 to 0.4 mm larger than the inner diameter of the folded-back portion, and a fitting portion that fits into the folded-back portion; A liquid container characterized by being provided with an enlarged diameter portion having an outer diameter larger by 0.1 to 0.3 mm than the outer diameter of the joint portion, and a tip portion whose outer surface is tapered toward the tip. .