JP3161262B2 - Multi-layer container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for accommodating highly permeable contents, such as liquid detergents for homes such as kitchens and bathrooms, shampoos, rinses, and facial cleansers, and particularly to a combination with a cap. And has reliable sealing properties.

[0002]

2. Description of the Related Art Conventionally, highly permeable contents such as liquid detergents, shampoos, rinses, and facial cleansers for homes such as kitchens and bathrooms, and low-viscosity, highly permeable foamy face wash containers and the like. In this case, it is common to prevent the contents from leaking by using a sealing plug called an inner plug.

[0003] The inner plug is usually formed using a soft resin. Particularly in the case of a blow-molded container, the mouth has a high rigidity. The inner plug is pressed against the inner surface of the mouth of the container by stress to prevent the contents from leaking.

However, in recent years, there has been a strong demand from detergent manufacturers, consumers, and the like for containers in which the cap is oriented in a specific direction with the cap tightened to the mouth of the container, so-called containers with positioning caps. Something has been proposed and put on the market.

By the way, the positioning cap is used in such a manner that the cap can be opened and closed by a simple operation, or the cap is provided with a nozzle to spray or dispens the function to spray or discharge the contents in a certain direction. Many of them are used for applications.

As a resin suitable for satisfying the above functions, a blow-molded article using a relatively hard polypropylene resin is often used as a container body. When a positioning cap is used, an inner plug is used. In general, they are not used, but rather they cannot be used due to their structure. Therefore, in the case of a container with a positioning cap, there is no choice but to use a combination of a hard container and a hard cap, and there is a problem that it is difficult to make a sealed structure capable of preventing leakage of contents.

To solve the above problem, Japanese Utility Model Laid-Open No. 6-75727 has been proposed. This is a plastic bottle using an inner type cap, wherein at least the injection port of the plastic bottle has a two-layer plastic structure, and the material of the inner layer is Rockwell hardness (JIS-K720).
2) R65 or less. Therefore, although the sealability is obtained for the container using the inner type cap, that is, the container having the cap having the inner ring, the effect is obtained in the case of the so-called container having the sealability by the contact ring. Absent.

The container disclosed in Japanese Utility Model Laid-Open No. 6-75727 is based on the premise that an inner-type cap, that is, a cap having an inner portion (inner ring) is used. This is a structure that cannot be adopted in a cap provided with a function of positioning or the like that cannot be provided.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a multi-layer container having improved sealing with a functional cap or the like while maintaining strength and squeezability of the container body. It is the purpose.

[0010]

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and has at least two layers of resin.
In a multi-layer container comprising a plurality of layers, the resin
When the lid is closed, the contact holes
The resin layer in contact with the ring has a R scale hardness of 60 or less.
Resin layer made of grease and contact with contact ring
And the other resin layer, mutual R scale hardness of a multilayer container which is characterized in that the 20 or more different resins.

Hereinafter, the present invention will be described in detail with reference to the drawings.

One of the important structural features of the container according to the present invention, which is excellent in liquid stopping performance, that is, exhibits an excellent function of preventing liquid leakage even when preserving contents having a high osmotic power, is a multilayer structure. R scale hardness of 60 during layer construction of blow container
The point is that at least one of the following resin layers is provided.

FIG. 1 is a cross-sectional view of an essential part showing an example of the present invention, wherein an inner layer (1) and an outer layer (3) of a three-layered container body are shown.
Is made of a resin having high hardness, and the intermediate layer (2) is the inner layer (1).
And a resin having a lower hardness than the outer layer (3). The intermediate layer (2) is exposed at the end face (a) of the mouth (5) of the container (4) and has a cap (8) having a contact ring (7) inside a top plate (6) as shown in FIG. ) The mouth (5)
When it is fitted on the contact ring (7), the tip (b) of the contact ring (7) comes into close contact with the low hardness intermediate layer (2) exposed at the mouth (5), thereby preventing the contents from leaking.

FIG. 3 is a sectional view of a main part showing another example of the present invention. The container body has a two-layer structure and an inner layer (9).
Is made of a resin having a low hardness, and in combination with the cap (8) shown in FIG. 2 described above, the tip (b) of the contact ring (7) comes into close contact with the inner layer (9) exposed at the mouth so that the contents are in contact. Leakage is prevented.

FIG. 4 is a cross-sectional view of a main part showing still another example of the present invention. In the five-layer structure, two layers (10) and (11) near the center are made of a resin having a low hardness, and another resin is used. Three layers (1
2) (13) and (14) are made of resin with high hardness,
In this case, the contact ring (7) of the cap may be in close contact with one of the two layers (10) and (11), or the contact ring (7) may be attached to both layers of (10) and (11). It can be in contact with each other to form a double sealed structure.

In the present invention, further, in a laminated structure of two or more resins, at least two or more resin layers are used.
In the multi-layer container, the cap of the resin layer is closed.
At the time of lid, contact ring provided on the bottom of the cap
The contacting resin layer is made of a resin whose R scale hardness is 60 or less.
And the resin layer that the contact ring contacts
The resin layer, each other R scale hardness of 20 or more different resins
It is characterized in that the content was. Polyolefin resins generally used as blow-molded containers often have an R-scale hardness of 60 to 90, and when used directly as a molding material for the container, the mouth of the container is too hard when combined with the above cap with a contact ring. As a result, if the contact between the contact ring of the cap and the end face of the air outlet becomes uneven, or if the contact ring is brought into contact with a predetermined position, an abnormally large torque is required for tightening the cap. There is a problem that the fastening is not performed stably.

Therefore, in the present invention, by using a resin having a low R scale hardness having an R scale value of 60 or less, preferably in the range of 55 to 20, the contact ring is brought into contact with the low hardness resin so that the resin has a low hardness. Of the mouth is uniformly suppressed to prevent leakage of the contents. When the R scale value exceeds 60, when the contact ring of the cap starts to contact the mouth of the container, the tightening torque of the cap becomes too large, or the contact strength between the contact ring and the mouth of the container is insufficient. This is because they tend to be uniform.

In the case of a two-layer structure, the resin having a high hardness and the resin having a low hardness may be located outside or inside. In the case of a three-layer structure, the inner layer and the outer layer may be made of a resin having a low hardness and the intermediate layer may be made of a resin having a high hardness, as required, contrary to the structure shown in FIG.

As the resin having high hardness in the present invention, ordinary polypropylene resin, high-density polyethylene resin and the like can be used. As the resin having low hardness, thermoplastic elastomers such as ethylene-propylene copolymer elastomer and low-density polyethylene can be used. Resins, ethylene-vinyl acetate copolymer resins, ionomer resins, and the like can be used.

The ratio of the thickness of the resin having a low hardness of the multilayer container of the present invention to the thickness of the entire container is preferably 20 to 80%, more preferably 25 to 50%.
If it exceeds 80%, the rigidity required for the container cannot be obtained, and if it is less than 20%, the effect of adhesion to the cap cannot be obtained.

[0021]

The present invention has the above-described structure, and has an R scale between the tip of the contact ring of the cap and the mouth end face of the container.
Resin with a hardness of 60 or less comes into contact, and the tip of the contact ring bites into the resin with an R-scale hardness of 60 or less. Is securely stopped inside the contact ring and does not leak out of the container.

[0022]

Embodiments will be described below.

<Example 1> A polypropylene resin having a Rockwell hardness of 90 (K7010:
A multilayer blow container was obtained by using a polypropylene resin having a Rockwell hardness of 38 (C418B: manufactured by Ube Industries, Ltd.) as an intermediate layer resin. The ratio of the layer thickness of the obtained container is as follows: inner layer: intermediate layer: outer layer = 1: 1:
It was one. This multi-layer blow container is filled with a liquid kitchen detergent having a high permeability as a content, and a positioning hinge cap made of polypropylene resin (Rockwell hardness 100) having a contact ring on the inside of the top surface is tightened to a torque of 9K.
After sealing with gM by screw fitting, there was no leakage of the contents even when inverted and stored for 3 months. In addition, the squeezing property was good because it had appropriate flexibility for extruding the contents. Further, the buckling strength of the container was sufficient at 40 kg / cm ^2, which was sufficient for use.

Example 2 A high-density polyethylene resin having a Rockwell hardness of 60 (HIZEX 3000B: manufactured by Mitsui Petrochemical Co., Ltd.) was used as the outer layer and the inner layer resin, and a polyethylene resin having a Rockwell hardness of 40 (HIZEX 5100B) was used as the intermediate layer resin. ) To obtain a multilayer blow container. This multi-layer blow container is filled with a liquid kitchen detergent in the same manner as in <Example 1>, and is made of a polypropylene resin having a contact ring inside the top surface (Rockwell hardness 100).
After the positioning hinge cap was tightened and sealed at a torque of 9 kgM by screw fitting, there was no leakage of the contents even if the storage was inverted for 3 months. In addition, the squeezing property was also <Example 1.
> As good. Further, the buckling strength of the container is 35
kg / cm ² was sufficient for use.

Example 3 A polypropylene resin having a Rockwell hardness of 90 (K7011:
Using a thermoplastic elastomer having a Rockwell hardness of 50 or less (TPE82) as an interlayer resin using Chisso Corporation.
2: Sumitomo Chemical Co., Ltd.) to obtain a multilayer blow container. The ratio of the layer thickness of the obtained container is as follows: inner layer: middle layer: outer layer =
2: 2: 1. This multi-layer blow container is filled with a liquid kitchen detergent as a content, and is made of a polypropylene resin having a contact ring inside the top surface (Rockwell hardness 10).
0) Tighten the positioning hinge cap and reduce the torque to 9 kgM.
After sealing by screw fitting, there was no leakage of the contents even after inverted storage for 3 months. Further, the squeezing property was also good as in <Example 1>. Furthermore, the buckling strength of the container was 39 kg / cm ^2, which was sufficient for use.

<Comparative Example 1> A single-layer blown container was molded using a polypropylene resin having a Rockwell hardness of 90, and the contents were filled in the same manner as in the example, the cap was fitted, and the container was inverted and stored for 2 weeks. In the second week, the contents began to seep out from the fitting portion between the cap and the mouth of the container, indicating that the sealing property was insufficient.

[0027]

As described above, the present invention has the above-mentioned structure. (A) Since there is at least one resin having a lower hardness at the end face of the container mouth, the end face comes into contact with the contact ring of the cap so as to bite. Excellent in nature. (B) Even when the total thickness of the container is relatively thick due to the multilayer structure, the sealing performance with the cap can be improved and the squeezing property can be maintained by selecting and combining the resin. (C) Since the squeezing property can be maintained, it can be used not only as a spray or discharge container for manipulating the cap, but also as a container for squeezing the container. Can respond.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a fitting state with a cap according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

 1,9 Inner layer 2 Intermediate layer 3 Outer layer 4 Container 5 Mouth 6 Top plate 7 Contact ring 8 Cap 10,11 Low hardness resin 12,13,14 High hardness resin

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B32B 27/00 B32B 27/00 H 27/32 27/32 E (56) References JP-A-56-4539 (JP, A) JP-A-56-158 (JP, A) JP-A-55-154233 (JP, A) JP-A-6-75727 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 53/00 B29C 49/22 B32B 1/02 B32B 7/02 101 B32B 27/00 B32B 27/32

Claims (5)

(57) [Claims] 1. A multilayer comprising at least two resin layers.
In the container, of the resin layer, when the cap is closed,
Contact the contact ring provided on the lower surface of the cap
The resin layer is made of a resin having an R scale hardness of 60 or less;
One resin layer and another resin layer that the contact ring contacts
The multilayer container according to any one of claims 1 to 3, wherein the resins are different from each other in R scale hardness by 20 or more. 2. An R scale hardness of 60 or more from the outside of the container.
2. The multilayer container according to claim 1, wherein the resin and the resin having an R scale hardness of 60 or less are laminated in this order. Wherein R scale from the outside of the container 60 or more trees <br/> butter, R scale 60 following resins, further R scale 6
2. The multilayer container according to claim 1, wherein the layers are laminated in the order of zero or more resins. 4. A resin layer having an R scale hardness of 60 or less has a thickness ratio of 20 % of the total thickness of the container in the vicinity of the end face of the container opening.
Characterized in that to 80%, of claims 1 to 3
A multilayer container according to any one of the preceding claims. Wherein R scale hardness 60 or more resins and R scale hardness 60 or less of the resin, characterized in that it consists of a resin consisting mainly of polyolefin, according to claim 1 to 4
The multilayer container according to any one of the preceding claims.