JPH08282733A - Composite container - Google Patents

Abstract

PURPOSE: To easily confirm the contents from the outside by forming the surface of a window part of an inside container exposed from an opening of an outside container so as to be level with the surface of the outside container. CONSTITUTION: An opening 3 having a narrow width and extending in the longitudinal direction of a composite container P is formed, in the slit-like form, near the bottom on the lower side of an outside container 1. A portion of an inside container 2 exposed from the opening 3 is formed into a window part 4. In the container 2, the window part 4 exposed from the opening 3 is formed so as to be level with the circumferential surface of the container 1 so that the outline of the window part 4 is in conformity with the edge of the opening 3. The composite container P has the opening 3 in the container 1 and is closed by the window part 4, and hence remaining amount or color of the contents can be confirmed through the window part 4.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an inner container made of a plastic container and an outer container made of a paper container.
The present invention relates to a composite container in which both are integrally combined.

[0002]

2. Description of the Related Art Conventionally, a plastic container has been used as a container for storing various detergents, beverages and the like, but an alternative container has been studied in order to protect the environment and reduce the amount of plastic.

As the alternative container, a container made of a composite of paper and plastic, a container made of paper only by coating the surface of polyethylene with a container, or an aluminum plate on the surface of paper for improving the protective function of the contents. A paper container having a multi-layer laminated structure in which nights and the like are laminated is often used.

[0004]

However, in such a conventional composite container, it is difficult to separate the paper and the plastic from each other, and there is a problem that the alteration state cannot be confirmed from the state of the remaining amount and color of the contents. Further, although there is a bag-in-box type in which an outer box is provided with a window so that the inner bag can be seen from the outside, there is a problem that it is difficult to see because it is retracted in the back. The present invention focuses on such a problem, and an object thereof is to provide a composite container in which the contents can be easily confirmed from the outside.

[0005]

In order to solve the above-mentioned problems, the composite container according to claim 1 of the present invention can hold the outer periphery of a plastic inner container having a spout in the form of this inner container. In a composite container covered by a strong paper outer container, an opening is formed in this outer container,
The inner container exposed from the opening is formed as a window, and the window surface of the inner container exposed from the opening is formed flush with the outer container surface.

According to a second aspect of the present invention, there is provided the composite container according to the first aspect.
In the composite container of 1), the outer container and the inner container are bonded by an adhesive.

A composite container according to a third aspect of the present invention is characterized in that, in the composite container according to the first and second aspects, the exposed portion of the inner container is provided with projections or recesses at regular intervals.

[0008]

According to the composite container of claim 1 of the present invention,
The inner plastic container and the outer paper container can be easily separated, and since the surface of the inner container exposed from the opening of the outer container is flush with the surface of the outer container, the contents of You can check the status such as remaining amount and color. Claim 2
According to the composite container of (1), since the outer container and the inner container are adhered to each other, they are not separated from each other during use and the buckling strength is improved. According to the composite container of claim 3, the remaining amount of the contents can be easily confirmed with the naked eye by the scale.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A composite container according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a composite container according to one embodiment of the present invention. The composite container P includes an outer container 1 made of paper and formed in a tubular shape having a rectangular cross section, and a plastic bottle-shaped inner container 2 having a rectangular cross section housed in the outer container 1.
The inner container 2 has a spout 2a. The outer container 1 covers the shoulder, bottom and body of the inner container 2. As shown in FIG. 2, an opening 3 having a narrow width and extending in the longitudinal direction of the composite container P is formed in a slit shape in the lower part of the side surface of the outer side 1, and the inner container exposed from this opening 3 is shown. 2 is formed as the window portion 4. In the inner container 2, the window 4 exposed from the opening 3 is formed flush with the peripheral surface of the outer container 1, and the contour of the window 4 is fitted to the edge of the opening 3. Since the outer container 1 is provided with the opening 3 and is closed by the window 4, the composite container P can confirm the status such as the remaining amount and color of the contents through the window 4. The size of the opening 3 can be provided at any position as long as the shape of the outer container is maintained, such as at the center of the inner side surface or near the corner. Further, its shape can be designed arbitrarily. FIG. 3 shows the outer container 1
The developed shape of is shown. In the development view of the outer container 1, the body walls 5 on four sides are formed in the same shape and the same size and are continuously arranged. And a flange portion 7 that covers the bottom portion is formed in the lower portion of the body wall portion 5. An adhesive paste margin 9 is formed on the body wall portion 5 at the right end, and an adhesive paste margin 10 is formed on the trapezoidal portion 6, and the ends of the flange portion 7 are overlapped with each other and adhered. When the body wall portions 5 are bent in a rectangular shape and adhesive is applied to both corner portions of the glue margins 9 and 10 and the flange portion 7 and sack attachment is performed, the outer container 1 having a rectangular cross section is formed.

In order to manufacture this composite container P, first, referring to FIG.
The outer container 1 having the expanded shape shown in (1) is formed into a tubular shape and set in a blow molding die. Next, the heat-softened preform is inserted into the outer container 1 through the opening in the upper portion of the outer container 1 in the blow molding die, and the preform is blown to be integrally molded by in-mold molding. .

When molded by the in-mold molding method, the window 4 of the inner container 2 projects by the thickness of the outer container 1, so that the surface of the outer container 1 at the opening 3 does not have to be provided with a recess in the mold. And the surface of the window part 4 becomes flush. Also, by coating the surface of the outer container 1 on the side in contact with the inner container 2 with an adhesive in advance, the adhesion between the outer container 1 and the inner container 2 is improved, and there is no risk of spontaneous separation. Unless the outer container 1 and the inner container 2 are adhered to each other at the shoulder and bottom of the composite container P and not to the body, the deformation of the inner container 2 due to the reduced pressure becomes inconspicuous.

As a method of manufacturing the composite container P, there is also a method of first forming the inner container 2 by blow molding and then fitting the outer container 1 thereafter. As a method of molding the inner container 2, there are a direct blow molding method, a biaxial stretch blow molding method, and the like. Opening 3 of outer container 1
The window portion 4 is provided with linear marks at regular intervals or with concave portions or convex portions as a scale for making it easier to determine the remaining amount of the contents.

As the molding material for the inner container 2, polyethylene, polypropylene, polyacrylonitrile, nylon, polyethylene terephthalate, polyvinyl chloride, etc. can be used. Is preferred. Polyethylene terephthalate can be thinned by using a biaxial stretch blow molding method and the amount of waste can be reduced. In addition, since it burns less calories during combustion than other materials, it is environmentally friendly.

Since the outer container 1 reinforces the inner container 2, the buckling strength of the composite container 1 becomes strong even if the plastic thickness of the inner container 2 is very thin, and the composite container 1 can easily be dropped. It will not be damaged. Further, since the outer container 1 and the inner container 2 can be easily separated from each other, the paper container and the plastic container can be disposed of without being bulky even after the content liquid is used and discarded.

[0016]

[Experimental Example 1] In Experimental Example 1, the outer container 1 is provided outside the inner container 2.
Is a method of coating. First, using a high-density polyethylene resin, direct blow molding makes a basis weight of 33 g,
An inner container 2 having an inner volume of 1000 ml as shown in FIG. 2 was molded. Next, the outer container 1 made of cardboard having a window portion was attached to the outside of the inner container 2 to manufacture the composite container P shown in FIG. This composite container P has no problem in appearance,
The inner container 2 and the outer container 1 can be easily separated after use, and the contents and colors of the containers can be easily confirmed.

[0017]

[Experimental example 2] Experimental example 2 is based on in-mold molding. First, a polyethylene terephthalate resin is used to mold a preform by injection molding, and then an outer container 1 made of cardboard is placed in a blow molding die. A preform heated by an infrared heater was inserted into the outer container 1 set in the blow molding die, and the inner container 2 having a basis weight of 15 g and an inner volume of 1000 ml was in-molded by in-mold forming. The composite container P had no problem in appearance, and the inner container 2 and the outer container 1 could be easily separated after use, and the contents, colors, etc. could be easily confirmed.

[0018]

[Experimental Example 3] In Experimental Example 3, as in Experimental Example 1, the inner container 2 is covered with the outer container 1, and high-density polyethylene resin is used to form irregularities at regular intervals near the window 4. Direct blow molding was performed using a mold to mold the inner container 2 having a basis weight of 33 g and an internal volume of 1000 ml. Next, the outer container 1 provided with an opening 3 made of cardboard was attached to the outside of the inner container 2 to manufacture the container shown in FIG. This composite container P has no problem in appearance, and the inner container 2 and the outer container 1 can be easily separated after use.
I could easily check the situation such as color.

[0019]

[Experimental Example 4] In Experimental Example 4, in-mold molding is performed as in Experimental Example 2. First, an outer container 1 made of cardboard with an adhesive applied inside is prepared. Next, a preform is molded by injection molding using polyethylene terephthalate resin. Then, the cylindrical outer container 1 is set in the cavity of the mold. It should be noted that recesses at regular intervals are provided in a portion of the cavity of the molding die that abuts the window portion 4. After the outer container 1 was set in the mold, the preform was heated by an infrared heater and inserted into the outer container 1 to perform biaxial stretch blow molding of the preform. This gives a basis weight of 15 g and an internal volume of 10 as shown in FIG.
A 00 ml composite container P was molded. This composite container P had no problem in appearance, and the inner container 2 and the outer container 1 could be easily separated after use, and the conditions such as contents and colors could be easily confirmed.

[0020]

According to the composite container of the present invention, the surface of the inner container exposed from the opening of the outer container and the surface of the outer container are flush with each other. The situation can be easily observed with the naked eye, the outer container and the inner container can be easily separated, and the amount of plastic used can be greatly reduced, which is suitable for environmental protection such as dust reduction. Furthermore, when the in-mold molding method is used, it is not necessary to provide a concave portion of the mold for projecting the window portion of the inner container to be flush with the surface of the outer container, so that the opening portion and the window portion are flush with each other. The molded container can be easily molded using an existing mold, and the molding is easier than when only the inner container is molded beforehand.

[Brief description of drawings]

FIG. 1 is a diagram showing a composite container according to an embodiment of the present invention.

2 is a cross-sectional view of the composite container of FIG.

FIG. 3 is a development view of an outer container of the composite container of FIG.

[Explanation of Codes] 1 outer container 2 inner container 3 opening 4 window 5 trunk wall 6 trapezoid 7 flange

Claims (3)

[Claims] 1. A composite container in which the outer periphery of a plastic inner container having a spout is covered with a paper outer container having a strength capable of retaining the shape of the inner container, and an opening is formed in the outer container. The inner container exposed from the opening is formed as a window, and the window surface of the inner container exposed from the opening is formed flush with the outer container surface. A composite container. 2. The composite container according to claim 1, wherein the outer container and the inner container are adhered by an adhesive. 3. The composite container according to claim 1, wherein the exposed portion of the inner container is provided with convex portions or concave portions at regular intervals.