JP3451745B2 - Composite 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 plastic container, and more particularly to a composite container in which a paper tube is mounted to reduce the wall thickness for the purpose of resource saving and to reinforce its strength.

[0002]

2. Description of the Related Art Conventionally, bottle-shaped containers made of plastic resin such as polyethylene and polypropylene by blow molding have been widely used. However, recently, from the viewpoint of environmental protection, there has been a demand for reduction of the amount of plastic resin used in these containers and separate collection. Therefore, in order to reduce the amount of plastic resin used, it is conceivable to reduce the thickness of the container, but in this case, the container is generally softened, which makes it difficult to stand by and to hold.

In order to avoid such problems, a container in which a thin plastic bottle is reinforced with a paper cylinder has been proposed. For example, the one disclosed in Japanese Patent Publication No. 6-505949 shown in FIG. 5 has a body portion 50 of a plastic bottle, in which a concave portion 51 having a substantially quadrangular shape and inclined downward toward the inside of the container is formed. A flap 53 is formed at the upper end of the plastic container package to be engaged with this recess.

However, in the above-mentioned conventional example, the flap 53 is pressed against the wall of the recess 51 by utilizing the fact that the recess of the container is formed so as to incline inward toward the container, and the engaging force is generated by the repulsive force. Since the shape of the flap 53 is a quadrangle, it has an advantage that it can be easily attached, but there is a risk that the container may come off from the paper tube 52 if only the container is pulled upward.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, from the standpoint of environmental protection that contributes to the reduction of the amount of plastic resin used and the separate collection of plastic products, the body of the container body is reinforced with a paper cylinder and An object of the present invention is to provide a composite container in which the container body is hard to come off from the paper tube.

[0006]

In order to solve the above-mentioned problems, the present invention forms an engaging portion composed of a recess in the body of a container body made of thin plastic, and at least surrounds the body of the container body. On the top side of the paper tube that holds the
With the engaging portion that can be folded back to the inner surface of the paper tube with the intervening
A flap having a corresponding shape is formed, and the flap is folded back to the inner surface of the paper tube through a folding line in the engaging portion of the container body.
In a composite container in which flaps are engaged, the shape of the engaging portion has key-shaped portions projecting outward at both left and right lower ends, and the outer ends of the key-shaped portions at both left and right ends are It has a shape that opens in a taper shape upward and folds back.
The front flap projects outward at both left and right upper ends.
It has a key-like piece that comes out and is vertically symmetrical with the shape of the engaging part
A composite container characterized by having a similar shape to the above. Further, it is preferable that the engaging portion is a concave portion that inclines downward toward the inside of the container.

As a material for the container body made of thin plastic, a thermoplastic resin such as polyester or polypropylene, a high barrier resin such as a copolymer having acrylonitrile or methacrylonitrile as a main component, or a thermoplastic resin is used. A blended or laminated gas barrier resin such as a saponified ethylene-vinyl acetate copolymer or aromatic nylon can be used.

The material of the paper cylinder is 300 to 400 g /
A paperboard with a thickness of about m ² can be used according to the purpose, such as recycled paper or waterproof paper.

[0009]

According to the present invention, as shown in FIG. 1, the body 4 of the container 1 body made of thin plastic is provided with an engaging portion composed of a recess, and the flap of the paper tube 6 is bent by a folding line.
Since it is engaged with and fixed to the inner side of the paper tube 6 in a folded state , the main body of the container 1 can be mounted by a simple operation of inserting it into the paper tube 6 from below . Then, at this time , the flap is attached to the concave key-shaped portions 4c and 4c protruding to the left and right of the engaging portion.
After the key-shaped pieces 7c, 7c protruding to the left and right of the
Key piece 7 when the force to grasp only the container and pull it upwards acts
Since the upper ends of c and 7c are hooked on the upper ends of the concave key-shaped portions 4c and 4c, they cannot be easily removed from the paper tube 6. Further, if the engaging portion is formed of a concave portion that inclines inward toward the container 1 downward, the flap can be pressed against the wall of the concave portion, and the engaging force can be further increased by the repulsive force.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The container body of this example is a semitransparent thin-walled bottle produced by blow molding a polyethylene resin. The thin bottle will be described with reference to FIGS. 1 and 2. The thin bottle 1 is composed of a mouth portion 2 having a screw portion, a shoulder portion 3, a body portion 4 and a bottom portion 5.

The molded thin bottle 1 has a substantially quadrangular cross section, and the shoulder 3 bulges slightly outward and a step 3b is formed at the boundary with the body 4. Recesses 4a are formed on the front surface and the back surface of the body portion 4 and serve as engaging portions for engaging the flaps of the paper cylinder. The recess 4a is composed of an upper vertical recess 4b and a lower key-like part 4c. The key-shaped portion 4c is continuously provided at the lower end of the vertical recess 4b with a hypotenuse 4d that opens downward, and the key-shaped portion 4c has a shape that tapers toward the hypotenuse 4d.

When the size and wall thickness of the thin bottle 1 were measured, the amount of resin used was 33 g, the full-filling capacity was 1000 ml, and the wall thickness of the body 3 was 100 μm to 200 μm.
And it was extremely thin.

As another molding method, a translucent thin bottle can be obtained by injection stretch blow molding. As a molding procedure in this case, first, a test tube-shaped molded product (hereinafter referred to as a preform) not shown by injection molding
To mold. This preform is composed of a mouth portion and a tubular portion, and the body portion and the bottom portion of the bottle are formed by extending the tubular portion vertically and horizontally. Next, this preform is inserted into a blow mold, stretch blown, and sufficiently stretched in the longitudinal and transverse directions to form a thin bottle. By using the injection stretch blow molding method as described above, the gas barrier property, the aroma retaining property, the strength, and the like are improved, so that the amount of resin used can be significantly reduced.

The paper cylinder 6 is a paperboard made of recycled paper 300-
Printing processing and surface treatment were performed using a material having a thickness of 400 g / m ² . As shown in FIG. 4, the blank of the paper tube 6 has flaps 7a and 8a connected to the upper ends of a front plate 7 and a back plate 8 which are connected by interposing side plates 10 and 10 by folding lines, respectively. The thin-walled bottle 1 has a notched portion 9 which is formed by cutting out the upper end portion of the portion in contact with the corner portion in an inverted mountain shape. A glue margin portion 10b is continuously provided on one side plate 10.

The flap 7a has a slightly smaller shape similar to the shape of the concave portion 4a of the thin bottle 1 and is composed of a lower vertical plate portion 7b and an upper key piece 7c. The key-shaped piece 7c is a hypotenuse 7 that opens upward at the upper end of the vertical plate portion 7b.
The key-shaped pieces 7c have a shape that opens in a taper shape toward the hypotenuse 7d. Since the flap 8a has the same shape as the flap 7a, the description thereof will be omitted.

The upper sides 10e, 7e, 8e of the paper cylinder are set so that they contact the step 3b at the lower end of the bulging shoulder 3 of the thin-walled bottle 1. Therefore, even when the container body tends to slide downward when held in the upright state, it is reliably supported by the step 3b. Further, since the peripheral surface of the thin-walled bottle 1 and the peripheral surface of the paper tube are formed flush with each other, there is an advantage that it is preferable in terms of appearance. Further, since the entire length of the paper cylinder 6 reaches the lower end of the thin-walled bottle 1 when attached to the thin-walled bottle 1, the buckling strength of the entire composite container can be improved.

After filling the thin-walled bottle 1 thus produced with the liquid detergent, the paper cylinder 6 preliminarily assembled in a tubular shape is flapped from below the thin-walled bottle 1 as shown in FIG.
Was inserted in a state of being bent inward, and the flaps 7a and 8a were engaged and fixed to the recess 4a. The composite container 11 was held upside down and repeatedly poured out little by little, but the thin-walled bottle 1 was not deformed to the end and the thin-walled bottle 1 could be used without coming out of the paper tube 6. After use, pull the thin-walled bottle upward while holding the paper cylinder strongly downward by pressing the notch 9 and pulling out the flaps 7a and 8a, the thin-walled bottle can be taken out.
Separated from the paper cylinder. At the time of discarding, the paper cylinder 6 was folded, and the body portion 3 of the thin bottle 1 was crushed by hand and discarded. Therefore, the waste capacity could be made much smaller than before.

In the above embodiment, the paper cylinder has a cylindrical shape, but the present invention is not limited to this and includes a cylinder with a bottom.

[0019]

According to the present invention, the engaging portion formed of the concave portion is formed in the body of the container body made of thin plastic,
Since the flap of the paper tube is engaged and fixed in a bent state along the folding line, it can be mounted by a simple operation of inserting the container body from above the paper tube. Then, at this time, after the key piece of the flap has entered the key portion of the engaging portion, when the force to pull out upward by grasping only the container acts, the key piece is caught on the upper end of the key portion It has the effect of not easily coming off. Further, if the engaging portion is formed of a concave portion that inclines downward toward the inside of the container, the flap can be pressed against the wall of the concave portion, and the engaging force can be further increased by the repulsive force. As described above, the present invention does not use an adhesive or the like for engaging the container body and the paper tube, and therefore can be easily separated and is preferable for separation and collection, and can contribute to reduction of the amount of plastic resin used, which is excellent in practical use. It is a composite container.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mounted state of an embodiment of a composite container.

2 is a front view showing the thin bottle of FIG. 1. FIG.

3 is a side view of the thin bottle of FIG. 2. FIG.

FIG. 4 is a development view of blanks showing an embodiment of a paper tube.

FIG. 5 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

1 ... Thin wall bottle 2 ... mouth 3 ... Shoulder 3b ... step 4 torso 4a ... recess 4b ... Vertical recess 4c ... key-shaped part 4d ... hypotenuse 5 ... bottom 6 ... Paper tube 7 ... Front plate 7a ... flap 7b ... Vertical plate part 7c ... key-shaped piece 7d ... hypotenuse 7e ... top 8 ... Back plate 8a ... flap 8e ... top 9 ... Notch 10 ... Side plate 10b ... glue margin 10e ... upper side 11 ... Composite container

Continuation of the front page (56) Bibliography Showa 63-131968 (JP, U) Showahei 1-6275 (JP, U) Showa 15-15126 (JP, Y1) Tokuhei 6-505949 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 77/06

Claims (2)

(57) [Claims] 1. A container main body made of thin plastic is provided with an engaging portion formed of a recess in a body thereof , and a folding line is formed on an upper side of a paper cylinder holding at least a peripheral surface of the body of the container main body.
A pair of engaging parts that can be folded back to the inner surface of the paper tube
A flap having a corresponding shape is formed, and the flap folded back to the inner surface of the paper tube through the folding line at the engaging portion of the container body.
A composite container in which wraps are engaged, wherein the shape of the engaging portion has key-shaped portions projecting outward at the lower left and right ends, and the outer ends of the respective key-shaped portions at the left and right ends are It has a shape that opens upward in a taper shape, before folding
The above flaps project outward at both left and right upper ends
And has a key-like piece that is vertically symmetrical with the shape of the engaging portion.
A composite container characterized by having a similar shape . 2. The composite container according to claim 1, wherein the engaging portion is a concave portion that inclines downward toward the inside of the container.