JP2631075B2 - Narrow mouth transparent 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 narrow-mouthed transparent container obtained by blow molding, and more particularly to a narrow-mouthed transparent container in which contents are prevented from adhering to the inner wall of the container.

[0002]

2. Description of the Related Art Conventionally, with the development of plastics, transparent containers made of PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), PVC (polyvinyl chloride), PC (polycarbonate) and the like have been developed. Used in large quantities. These transparent containers are generally manufactured by blow molding.

[0003] When the transparent container contains, for example, products having low adhesiveness and adhesion such as aqueous beverages, foods, seasonings, medicines, and chemicals, the contents contained in the transparent container become transparent. It does not adhere to the inner wall of the container. For this reason,
When a consumer purchases a product, the contents can be checked from the outside of the transparent container, and at the time of use, there is an advantage that the remaining amount of the contents can be immediately determined. Therefore, many of the contents contained in the transparent container are colored in advance so that the state or increase / decrease can be determined at a glance.

[0004] On the other hand, when the transparent container contains contents having particularly high adhesiveness and adhesiveness, the contents adhere to the inner wall of the transparent container and remain on the inner wall of the transparent container during use, and the outer part of the transparent container is removed. There is a drawback that it becomes impossible to check the state and the remaining amount of the contents from the computer. For this reason, for example, when the contents are used after being diluted, it is necessary to open the transparent container to check the remaining amount of the contents, which has a problem that it takes time and effort.

Furthermore, it is difficult to use the contents contained in the transparent container to the end, and the transparent container is discarded with the contents adhered to the inner wall, which is uneconomical. there were. Furthermore, when chemicals such as pesticides having strong adhesiveness and adhesiveness are contained in the transparent container, dumping the transparent container with the adhesive adhered to the inner wall of the transparent container may damage the natural environment. There was a problem that caused it.

[0006] In recent years, a method for preventing the contents from adhering to the inner wall even when the contents having strong adhesiveness and adhesion are accommodated in the transparent container has been studied.
One of the methods is to reduce the surface activity of the packaging material by coating the surface of the packaging material that comes into direct contact with the contents with a water-repellent material or a release material.

[0007]

However, among the transparent containers, those having a narrow mouth are mainly formed by blow molding. The material or release material cannot be coated. Therefore, the inner wall of the blow-formed transparent container is coated with a water-repellent material, a release material, or the like, but this is an extremely difficult operation, and the inner wall of the transparent container cannot be uniformly coated. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem. Even when a content having a strong tackiness and a strong adhesion property is stored, the content adheres to the inner wall. An object of the present invention is to provide a narrow-mouthed transparent container having excellent peelability and excellent chemical resistance, physical strength and economy.

[0009]

In order to achieve this object, the present invention relates to a narrow-mouthed transparent container obtained by blow molding, comprising a polymethylpentene layer, an adhesive polyolefin and a polymethylpentene layer in order from inside to outside. It is intended to provide a narrow-mouthed transparent container characterized in that a parison obtained by laminating as a resin layer and a shape-retaining resin layer is blow-molded while the parison still retains the fusibility. . Another object of the present invention is to provide a narrow-mouthed transparent container in which the shape-retaining resin layer has a gas barrier property.

[0010]

The polymethylpentene constituting the inner wall of the transparent container according to the present invention has no polar group in its molecular structure.
Does not absorb moisture and has very low surface activity. Therefore, even if the content having strong adhesiveness and strong adhesion temporarily adheres to the inner wall of the transparent container, the content is immediately flipped and peeled from the inner wall of the transparent container. Therefore, the content does not adhere to the inner wall of the transparent container and remains, so that the transparency of the transparent container is not reduced and the content is not wasted.

Further, polymethylpentene is excellent in transparency and chemical resistance, and therefore has properties suitable for the inner wall of a transparent container. Further, since a shape-retaining resin layer is formed on the outside of the polymethylpentene layer (outside of the transparent container) via an adhesive polyolefin resin layer having extremely excellent adhesiveness, the mechanical When the strength is reinforced and the shape-retaining resin layer is a resin having gas barrier properties (hereinafter referred to as “gas barrier resin”), in addition to mechanical strength, physical strength such as airtightness and impact resistance Will be reinforced.

Here, the adhesive polyolefin resin is excellent in transparency, heat resistance, chemical resistance, weather resistance and the like, and firmly forms the polymethylpentene layer and the shape-retaining resin layer (gas barrier resin layer). Glue. Therefore, during use of the transparent container, the polymethylpentene layer and the shape-retaining resin layer (gas-barrier resin layer) do not peel off, and have physical properties suitable as a resin (adhesive) constituting the transparent container. I have.

Further, in the narrow-mouthed transparent container according to the present invention, a parison formed by forming a polymethylpentene layer via an adhesive polyolefin resin layer inside a shape-retaining resin layer including a gas barrier resin layer is desirable. After being expanded by blowing air into the parison, it is formed by cooling and solidification. Therefore, the transparent container of the present invention can be easily and economically manufactured without performing a complicated coating technique.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a narrow-mouthed transparent container according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG.

As shown in FIGS. 1 and 2, the transparent container 1 according to the present invention comprises a polymethylpentene layer 5, an adhesive polyolefin resin layer 6, and a shape-retaining resin layer 7 in this order from inside to outside. It has the following structure.

In this embodiment, a layer made of "TPX (trade name); manufactured by Mitsui Petrochemical Industry Co., Ltd." is used as the polymethylpentene layer 5, and "Admer (trade name) is used as the adhesive polyolefin resin layer 6. ); A layer made of "EVAL (trade name); made of Mitsui Petrochemical Industry Co., Ltd." of a resin having gas barrier properties was used as a shape-preserving resin layer 7; .

The TPX is 4-methylpentene-1
It has no polar group in the molecular structure, does not absorb moisture, and has very low surface activity (surface tension (critical) = 24 dyne / cm). Therefore, even a substance having a strong adhesiveness or a strong adhesiveness has a property of being immediately flipped and peeled off. Further, since it has excellent transparency and chemical resistance, it is suitable as an inner wall of a transparent container.

The admer does not change with time, does not change at all when immersed in water, and has excellent durability against hot water, boiling water and retort treatment. Further, the adhesiveness between TPX and EVAL is extremely high, and is suitable as a resin constituting a transparent container.

The above-mentioned EVAL is obtained by copolymerizing polyvinyl alcohol having the lowest gas permeability among polymers with ethylene which gives thermoplasticity while maintaining its crystallinity, and has excellent impact resistance. Therefore, it is suitable as a resin constituting the transparent container.

This transparent container 1 is manufactured by the following method. First, the parison extruded from the extruder is sandwiched by a mold having a desired shape. Here, the parison is formed so as to have a structure in which the outer side is formed of the shape-retaining resin layer 7 and the inner side thereof is formed with the polymethylpentene layer 5 via the adhesive polyolefin resin layer 6.

Next, air is blown into the inside of the parison and expanded to transfer the shape of the mold. At this time, since the shape-retaining resin layer 7 and the polymethylpentene layer 5 are firmly bonded via the adhesive polyolefin resin layer 6,
All three expand together. Next, after the expanded parison was cooled and solidified, the mold was removed to obtain a transparent container 1.

As described above, the transparent container 1 according to the present invention comprises:
It can be manufactured by blow molding. Therefore, it can be manufactured simply and economically without performing a complicated process such as coating a water-repellent material or a release material on the inner wall of the transparent container formed in advance.

Next, the liquid releasability of the inner wall (polymethylpentene layer 5) of the transparent container 1 obtained in this example was examined by the following method. First, in the transparent container 1, as a content 2, a pesticide “Dokirin Flowable (trade name); manufactured by Nippon Agrochemical Co., Ltd.” having strong adhesiveness and strong adhesiveness is accommodated to about 1/3. Next, after the transparent container 1 is closed with a lid 3, the container is closed and rolled down, and the contents 2 are uniformly attached to the inner wall of the transparent container 1. Thereafter, the transparent container 1 was set upright, and the state in which the contents 2 were peeled off from the inner wall of the transparent container 1 was visually observed.

As a result, the contents 2 adhering to the inner wall of the transparent container 1 were immediately flipped and peeled off, and the transparency of the transparent container 1 was maintained. This is because the polymethylpentene layer 5 constituting the inner wall of the transparent container 1 does not absorb moisture and has the property of having a very small surface activity.

Next, the same investigation was conducted using PET containers, PP containers, PE containers, PVC containers, and PC containers. The contents remained on the inner walls of all these containers, Transparency was compromised.

Further, while the contents 2 were stored in the transparent container 1 at 40 ° C. for 30 days,
There was no change in the quantity or quality of the contents 2, and it was proved that good preservation was performed.

In this embodiment, "TPX" is used as the polymethylpentene layer 5, but it is not limited to this.
Other products may be used as long as they contain polymethylpentene.

In this embodiment, "Admer" is used as the adhesive polyolefin resin layer 6. However, the present invention is not limited to this.
Other commodities may be used.

Further, since it is sufficient that the shape-retaining resin layer 7 basically has the mechanical strength required as a container, it may be made of PP, PE, PVC, PC, or the like.
In this embodiment, the gas barrier resin “EVAL” was used in order to increase physical strength such as airtightness and impact resistance. However, other gas barrier resins, for example, a desired resin such as PET, EVOH, PVDC, NY, etc., may be used instead of EVAL. In addition, when gas barrier properties are high, such as EVOH and PVDC, but lack shape retention, these resins and resins having mechanical strength such as PP, PE, etc. are laminated via an adhesive to be retained. The shapeable resin layer 7 may be used.

In this embodiment, the transparent container 1 is manufactured by blow molding in order to simplify the manufacturing process and reduce the cost. However, the present invention is not limited to this. (For example, a multilayer extrusion molding method or a tubular method).

Further, in this embodiment, the pesticide was used for the investigation of the liquid releasability. However, the content 2 is not limited to this, and various contents such as other chemicals, high-viscosity foods, waxes, etc. are stored. Can be saved.

In the present specification, the term "transparent" does not mean only 100% transparency, but also includes translucent and colored transparent. In other words, the contents include those having a transparency such that the remaining amount of the contents can be confirmed from the outside.

[0033]

As described above, the narrow-mouthed transparent container according to the present invention is a narrow-mouthed transparent container obtained by blow molding, in which a polymethylpentene layer, an adhesive Uses a parison obtained by laminating as a polyolefin resin layer and a shape-retaining resin layer, and is characterized by being blow-molded while the parison still retains its gelling property, so that it has strong tackiness and strong adhesion. Even if the contents with are temporarily attached to the inner wall of the container,
It can be immediately flipped to detach from the inner wall of the container.

Further, by using a gas barrier resin as the shape-retaining resin layer, physical strength such as airtightness and impact resistance of the container can be reinforced. further,
The polymethylpentene layer and the gas barrier resin layer are firmly bonded by the adhesive polyolefin resin layer.

As a result of the above, it has excellent releasability in which the content does not adhere to the inner wall, and the state and the remaining amount of the content can always be confirmed from the outside of the transparent container. An excellent transparent container can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a transparent container according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent container 2 Contents 3 Lid 5 Polymethylpentene layer 6 Adhesive polyolefin resin layer 7 Shape-retaining resin layer (gas barrier resin layer)

Claims (2)

(57) [Claims] 1. A transparent container having a narrow mouth obtained by blow molding.
A polymethylpentene layer, an adhesive polyolefin resin layer, and a shape-retaining resin layer in this order from inside to outside.
Using a parison obtained by laminating as
A narrow-mouthed transparent container characterized by being blow-molded while maintaining the stiffness . 2. A narrow-mouthed transparent container, wherein the shape-retaining resin layer has gas barrier properties.