JPH1179208A - Cap structure of liquid container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap structure of a liquid container wherein content liquid can be used by rotating an over cap such as an over cap in an opening direction irrespective of a cap material, temperature change or a composition of the content liquid. SOLUTION: A cap 3 is fitted onto a neck 2 of a bottle l for detergent containing 20 to 50% of nonionic surfactant while an over cap 11 is detachably screwed onto the cap 3. Stoppers 10, 15 for preventing excessive screwing are provided on a female screw 9 on an inner peripheral wall face of the cap 3 and on a lower end of a male screw 14 on an outer peripheral wall face, respectively. Since the female screw 9 and the male screw 14 are no more present over the stoppers 10, 15, even if excessive tightening torque works, the over cap 11 may not be tightly screwed to be fed downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap structure for a liquid container storing a detergent or the like.

[0002]

2. Description of the Related Art Liquid containers for storing contents such as liquid clothing detergents, softeners, and finishing agents are classified into various types. Classified into types. Although not shown, the inner fitting type packaging container has a cap with a screw thread fitted on the inner surface of the peripheral wall at the neck of the bottle as its main body, and an overcap with a female thread fitted on the outer surface of the peripheral wall. It is detachably screwed. On the other hand, an outer fitting type liquid container, not shown, is fitted with a cap having a screw on the outer surface of the peripheral wall at the neck of the bottle, and an overcap having a female screw on the inner surface of the peripheral wall. Are removably screwed.

[0003] Regardless of the type of the bottle, the bottle is formed by blow molding using a material such as polyethylene (hereinafter abbreviated as PE) or polypropylene (hereinafter abbreviated as PP). In addition, the cap is formed by injection molding using PP, PE, or the like, regardless of the type, in order to easily regulate the direction when the cap is fitted to the bottle. In particular, it is formed by injection molding using PP as a material. Further, the overcap is formed by injection molding using transparent PP, PE, or the like, regardless of the type, in order to facilitate confirmation and visual recognition of the content liquid. In particular, injection molding using transparent PP as a material is frequently used.

[0004]

Since the conventional liquid container is configured as described above, there are the following problems. First, when the cap and the overcap are formed of relatively hard PP, respectively, since the tightening torque at the time of fitting is large, the deflection in the radial direction is large, and the tightening is strongly performed from the viewpoint of preventing leakage of the content liquid. . As a result,
The screwed overcap is difficult to rotate in the opening direction,
There was a problem that the content liquid could not be used.

Next, conventionally, there has been a problem that it is difficult for the overcap to rotate in the opening direction due to a temperature change or a season. For example, in a hot summer or the like, the synthetic resin easily expands due to a temperature change, and becomes easy to tighten. As a result,
There was a problem that the overcap was too tightly tightened so that it could not rotate in the opening direction during use. Further, in a cold winter or the like, the synthetic resin is difficult to be tightened due to low-temperature shrinkage, the tightening torque is large, the deflection is large, and the tightening is strongly performed from the viewpoint of preventing the leakage of the content liquid. As a result, the overcap becomes difficult to rotate in the opening direction, and there is a problem that the content liquid cannot be used.

Further, there has been a problem in the related art that the overcap screwed cannot be rotated in the opening direction due to the composition of the content liquid. In other words, when the content liquid is a poorly water-soluble cationic surfactant such as a finishing agent or a softener, the overcap can be relatively easily turned in the opening direction, but the content liquid is a nonionic surfactant such as a clothing detergent, Contains 1% or more and 70% of anionic surfactant, water-soluble cationic surfactant, or zwitterionic surfactant (usual use is 20% to 50%
However, when a predetermined time has elapsed since the overcap was screwed, it was extremely difficult to rotate the overcap in the opening direction, and there was a problem that the content liquid could not be used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and irrespective of the material of the cap, the change in temperature, or the composition of the content liquid, the overcap such as the overcap is easily rotated in the opening direction so that the contents can be opened. It is an object of the present invention to provide a liquid container cap structure that can use a liquid.

[0008]

According to the first aspect of the present invention, at least one of a nonionic surfactant, an anionic surfactant, a water-soluble cationic surfactant, and a zwitterionic surfactant is provided to achieve the above object. And a cap attached to the neck of a packaging container for the content liquid and allowing the content liquid to flow out of a spout,
An overcap detachably screw-fitted to the cap, and a stopper for preventing excessive screwing is formed on at least one of the cap, the peripheral wall fitting surface of the overcap, and a peripheral proximity surface. I am trying to do it.
Preferably, the stopper is formed at an end of a threaded portion of at least one of the cap and the overcap.

According to the present invention, when the overcap is screwed into the cap of the packaging container, a strong compressive force or tensile force is prevented from acting on the fitting portion between the cap and the overcap after the stopper. And the overcap is not sent out in the mounting direction. Therefore, since the overcap does not tighten tightly, even in the case of a packaging container for storing a content liquid containing a nonionic surfactant, an anionic surfactant, a water-soluble cationic surfactant, and / or an amphoteric ion surfactant,
The screwed overcap can be turned in the opening direction with a relatively small opening torque and removed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The inner fitting type liquid container in the present embodiment contains 20% nonionic surfactant.
A cap 3 is fitted to a neck portion 2 of a bottle 1 for a detergent (not shown) containing 〜50%, and an overcap 11 is screwed onto the cap 3 so as to be freely detachable.
Stoppers 10 and 15 for preventing excessive screwing are formed on the female screw 9 and the male screw 14 of the overcap 11, respectively.

The bottle 1 has cold resistance, impact resistance, water resistance,
It is formed by blow molding using PE, PP, or the like, which is excellent in chemical resistance or formability, and a cylindrical neck portion 2 is formed by projecting upward from the upper center thereof. A plurality of ratchets (not shown) are formed in the lower part of the surface so as to be arranged in the circumferential direction.

As shown in FIGS. 2 to 4, the cap 3 is basically formed into a cylindrical shape by injection molding using PP, PE, or the like, and the lower end of the peripheral wall has a stepped portion in a radially outward direction. A plurality of ratchets 4 meshing with the ratchet of the neck portion 2 are formed on the inner peripheral surface of the lower end portion side by side in the circumferential direction. An annular support flange 5 protrudes radially inward and downward from the center of the inner peripheral surface of the peripheral wall of the cap 3, and a projecting surface of the support flange 5 for facilitating the collection of the detergent in the bottle 1. Are formed so as to be inclined downward from one side to the other side, and the lower part of the nozzle 6 is integrally formed at the center of the support flange 5.

The nozzle 6 is located upright at the center of the cap 3 and is basically formed in a hollow substantially frustoconical shape with a substantially C-shaped cross section. The nozzle 6 has upper and lower sides curved and inclined downward, and a plurality of reinforcing ribs 7 extending in the vertical direction are formed on the inner peripheral surface at predetermined intervals. The vertically long gap 8 defined by the nozzle 6 is located on the descending side of the inclined surface of the support flange 5. Also,
A female screw 9 (trough) is formed by threading on the inner peripheral surface of the peripheral wall of the cap 3, and the lower end of the female screw 9 in the direction of travel is embedded and formed into a flat cut surface. Functions as a stopper 10 for preventing excessive screw tightening.

As shown in FIG. 1, the overcap 11 is formed into a substantially inverted bowl shape having a closed upper portion by injection molding using a transparent material such as PP or PE, and a stepped flange 12 is formed from the center of the outer peripheral surface of the peripheral wall. Are formed so as to protrude outward in the radial direction, and the lower step portion of the step flange 12 comes into contact with the step portion cut out at the upper portion of the inner peripheral wall of the cap 3. A plurality of grooves 13 are formed side by side on the outer peripheral surface of the peripheral wall of the overcap 11, and the plurality of grooves 13 function as slip stoppers. In addition, a graduation made up of numerals and arrows (not shown) is formed on the inner peripheral surface of the peripheral wall of the overcap 11 to secure the weighing. Further, a male screw 14 is thread-formed at a lower portion of the outer peripheral surface of the peripheral wall of the overcap 11, and a lower end portion of the male screw 14 is cut and formed to be a flat cut surface. Function as a stopper 15.

In the above configuration, in order to assemble the liquid container, the delivered bottle 1 is filled with the content liquid and the bottle 1 is filled.
By capping and sealing the cap 3 and the overcap 11 set in advance on the neck 2 of the liquid container, the liquid container can be assembled. As another method, the bottle 1 is delivered with the cap 3 fixed to the neck 2, the bottle 1 is filled with the liquid content, and then the overcap 11 is screwed onto the cap 3 of the bottle 1 for capping. Once sealed, the liquid container can be assembled.

When a detergent is used, first, the screwed overcap 11 is removed by turning it in the opening direction.
If the bottle 1 is tilted and the detergent is poured from the nozzle 6 to the overcap 11 and weighed, a predetermined amount of the detergent can be put into a washing machine or the like. After use, the cap 3 can be capped by fitting the overcap 11 to the cap 3 and screwing it in the closing direction. At the time of this capping, since the internal threads 9 and the external threads 14 are not present after the stoppers 10 and 15, even if an excessive tightening torque is applied, the overcap 11 may be screwed tightly and sent downward. Absent.

FIGS. 5 to 7 show a second embodiment of the present invention. In this case, the cap structure of the liquid container is changed from the inner fitting type to the outer fitting type, and the cap 3A is formed. And the stoppers 10A, 1
5A is reversed inside and outside.

As shown in FIG. 5, the outer fitting type cap 3A is formed by injection molding using PP, PE, or the like, and has a reduced diameter portion 16, a larger diameter portion 17, and a maximum diameter portion from the upper part to the lower part. The part 18 is formed via a step part.
A nozzle 6 is integrally formed at the center of the reduced diameter portion to protrude. A male screw 14A is formed by threading on the outer peripheral surface of the enlarged diameter portion, and a lower end portion of the male screw 14A is cut to form a substantially rectangular cut surface. This cut surface is a stopper for preventing excessive screw tightening. Functions as 10A.

As shown in FIG. 6, the overcap 11A is basically formed by injection molding using a material such as transparent PP or PE into a substantially inverted bowl shape having a closed upper portion. A plurality of grooves 13A are formed side by side, and the plurality of grooves 13A function as slip stoppers. At the center of the overcap 11A, a cylindrical measuring spout 19 whose upper part is closed is formed in an integrally penetrated state, and on the inner peripheral surface of the measuring spout 19, a scale made up of figures and arrows (not shown) is formed. Weighing is ensured. The measuring spout 19 accommodates the nozzle 6 when not in use.

Further, a female screw 9A is formed by threading on the inner peripheral surface of the peripheral wall of the overcap 11A, and the lower end of the female screw 9A is formed by cutting to form a cut surface. It functions as a stopper 15A for preventing screw tightening. The other parts are the same as those in the above-described embodiment, and the description is omitted.

In the above construction, when the overcap 11A is screwed onto the cap 3A during capping, the stoppers 10A, 15A and thereafter are internally screwed 9A and the male screw 14A.
Since A does not exist, even if an excessive tightening torque acts, the overcap 11A is not screwed tightly and sent out.

According to the above configuration, even if the cap 3A and the overcap 11A are formed of relatively hard PP, the stoppers 10A and 15A for preventing excessive screwing are provided. There is no action of the tightening torque or the external force for fastening exceeding a predetermined amount. Accordingly, it is possible to extremely effectively prevent the screwed overcap 11A from rotating in the opening direction, and through this, the detergent as the content liquid can be appropriately used without leaking. In addition, it is possible to reliably prevent the problem that the overcap 11A screwed becomes difficult to rotate in the opening direction due to a temperature change or a composition of the content liquid.

FIG. 8 shows a third embodiment of the present invention. In this case, the cap structure of the liquid container is an inner fitting type, and the upper part of the nozzle cap 3B and the peripheral wall of the overcap 11 are connected to each other. The stoppers 10B and 15B are integrally formed.

The stopper 10B has a substantially right triangular shape, and is formed so as to protrude from the upper portion of the peripheral wall of the nozzle cap 3B. The stopper 15B has a substantially right-angled triangular shape, and has a bent flange 20 having a substantially Z-shaped cross section, which protrudes radially outward from the outer peripheral surface of the peripheral wall of the overcap 11.
It is formed to protrude downward at the top of the tip.
The other parts are almost the same as those of the above-described embodiment, and thus the description thereof is omitted.

In the above configuration, when the overcap 11 is screwed into the nozzle cap 3B at the time of capping and the end is approached, the stoppers 10B and 15B come into contact with each other to restrict the rotation of the overcap 11. Therefore, the overcap 11 is not screwed tightly and does not rotate after the stoppers 10B and 15B. Also in this embodiment, the same operation and effect as the above embodiment can be expected, and the stoppers 10B, 15B
Is not provided, so male screw 14A and female screw 9A
There is no need to machine the lower end of each of them.

Next, test results using the inner fitting type cap shown in FIG. 1 will be described. FIG. 9 shows a stopper 10,
FIG. 10 is an explanatory diagram showing the positive / negative torque relationship immediately after screwing of the conventional product without 15; FIG. 10 is an explanatory diagram showing the positive / negative torque relationship immediately after screwing the cap of FIG. 9 and 10, the vertical axis indicates the opening torque (kgc
m), and the horizontal axis is the tightening torque (k
gcm), where nonionic is a nonionic surfactant and cation is a poorly water-soluble cationic surfactant.

The opening torque of the cap tends to increase as the tightening torque of the cap 3 and the overcap 11 increases. However, the opening torque is smaller than that of the conventional product without the stoppers 10 and 15, and it is very easy to open. Proven.

Next, a comparison result of the positive and negative torque relationships between the conventional product and the cap will be shown. FIG. 11 is an explanatory diagram showing the positive / negative torque relationship of the conventional product, and FIG. 12 is an explanatory diagram showing the positive / negative torque relationship of the cap with the stopper of FIG. 11 and 12
In the above, N ake torque is the opening torque for the content liquid containing the nonionic surfactant, A ake torque is the opening torque for the content liquid containing the anionic surfactant, W ake torque is the opening torque for the content liquid containing the zwitterionic surfactant, K ake torque is the opening torque for the content liquid containing the poorly water soluble cationic activator.

As is apparent from a comparison between FIG. 11 and FIG. 12, the cap has a slightly larger opening torque when the tightening torque is 30 kgcm or more. Cap 11
Has been demonstrated to be extremely easy to open.

In the above-described embodiment, the bottle 1 is simply shown. However, the material, shape, or structure of the bottle 1 can be appropriately changed, for example, by making part or all of the bottle transparent.
The content liquid includes at least liquid beverages, cosmetics, foodstuffs, various finishing agents, softeners, various detergents, various daily necessities, bleaching agents, or various chemicals. Further, the contents of the surfactant and the activator can be appropriately changed. Also,
The material, shape, or structure of the cap 3, 3A, the nozzle cap 3B, or the overcap 11, 11A, 11B can be appropriately changed as necessary. For example, only a part of these may be formed of transparent PP or PE. Further, the shape and number of the scales of the overcaps 11, 11A and 11B can be appropriately increased or decreased.

Further, an inner plug other than the caps 3 and 3A and the nozzle cap 3B may be used,
An overcap having a structure other than 1A and 11B may be appropriately used. Alternatively, a normal flange may be formed so as to extend radially outward from the outer peripheral surface of the peripheral wall of the overcap 11, and this flange may be brought into contact with the upper portion of the peripheral wall of the cap 3. Furthermore, if the same effect can be expected, the thread, the root, the screwing depth, the lead, the pitch, or the shape of the stopper 10, 10A, 10B, 15, 15A, 15B, etc. are appropriately changed as necessary. It goes without saying that you can do it. For example, the stoppers 10, 10A, not at the lower end of the threaded portion but at the upper end or the center of the threaded portion.
15 may be provided.

[0032]

As described above, according to the present invention, regardless of the material of the cap, the temperature change, the composition of the content liquid, etc.
By turning the overcap in the opening direction, there is an effect that the content liquid can be used appropriately.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of a liquid container cap structure according to the present invention.

FIG. 2 is an explanatory perspective view showing a part of the cap of FIG.

FIG. 3 is an explanatory sectional view showing the cap of FIG. 2;

FIG. 4 is a plan view showing the cap of FIG. 1;

FIG. 5 is a side view showing a cap in a liquid container cap structure according to a second embodiment of the present invention.

FIG. 6 is an explanatory partial cross-sectional view illustrating an overcap according to a second embodiment.

FIG. 7 is a front view showing a second embodiment.

FIG. 8 is a partially sectional explanatory view showing a third embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a positive / negative torque relationship immediately after screw tightening of a product under a conventional example.

FIG. 10 is an explanatory diagram showing a positive / negative torque relationship immediately after the cap is screwed under the first embodiment.

FIG. 11 is an explanatory diagram showing a positive / negative torque relationship of a product under a conventional example.

FIG. 12 is an explanatory diagram showing a positive / negative torque relationship of the cap under the first embodiment.

[Explanation of symbols]

 1 Bottle (Packaging Container) 2 Neck 3 Cap 3A Cap 3B Nozzle Cap (Cap) 6 Nozzle (Spout) 9 Female Thread (Thread) 9A Female Thread (Thread) 10 Stopper 10A Stopper 10B Stopper 11 Overcap 11A Overcap 11B Overcap 14 Male thread (thread) 14A Male thread (thread) 15 Stopper 15A Stopper 15B Stopper

Claims (2)

[Claims] 1. A content liquid containing at least one of a nonionic surfactant, an anionic surfactant, a water-soluble cationic surfactant, or an amphoteric ion surfactant, and attached to a neck of a packaging container for the content liquid. A cap for allowing the content liquid to flow out from the spout, and an overcap detachably screw-fitted to the cap, wherein at least one of the cap, the peripheral wall fitting surface of the overcap, and a peripheral proximity surface is provided. A cap structure for a liquid container, wherein a stopper for preventing excessive screwing is formed on one of the caps. 2. The cap structure for a liquid container according to claim 1, wherein the stopper is formed at an end of a threaded portion of at least one of the cap and the overcap.