JPH0326098Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to improvements in composite containers.

[Conventional technology and its problems]

Conventionally, metal cans and glass bottles have generally been used as containers for storing and dispensing fruit juice and other beverages, alcoholic beverages, seasonings, and other liquids. However, because of the material they are made of, they cannot be incinerated, and their high specific gravity makes transportation and other handling costly, and those made of glass lack flexibility in printing, which poses problems in terms of aesthetics and commercial value.

As a countermeasure to this problem, a composite container has recently been developed in which a synthetic paper tube with a waterproof and moisture-proof film as the inner material is used for the container body, and a metal lid is fixed to at least one end. It tends to be widely used due to its advantages such as easy incineration and high printing flexibility.

What is important for this type of composite container is a strong fit between the synthetic paper tube and the metal lid, and leak-proof performance against internal and external pressure, but conventional structures have not been adequate in these respects.

In other words, this composite container is made by cutting a long raw tube continuously fed from a mandrel to the desired length, flanging the end of the short tube, and attaching metal to this part. It is made by arranging a lid disc and bending (seaming) the edges under pressure.

However, in the past, the end of the short tube was simply constructed at right angles to the tube axis, so when flanging it, the curl of the moisture-proof film part a on the inner surface, which is important to the exterior c It becomes shallow compared to .

Therefore, the metal lid base plate 20 is mixed with compound 1.
3 and tightening the seam, as shown in Fig. 8, the fit between the moisture-proof film part a and the metal lid curl inner wall 26 is shallow and the contact area is small, so a sufficient double seam effect cannot be obtained. , there was a risk of leakage of contents.

If you try to curl the moisture-proof film part a deeply to improve this, the sheath c will protrude a lot, so when the metal lid base plate 20 is wound tightly, an unreasonable axial compressive force will act on the sheath a. This caused the problem of wrinkles and undulations, which worsened the body shape.

[Means for solving problems]

This invention was devised through research to solve the above-mentioned conventional problems.It has a simple structure, exhibits good flange effect and double seam effect, and has no leakage caused by external or internal pressure. The object of the present invention is to provide a composite container of this type that can maintain high commercial value without causing wrinkles or waves on the exterior.

To achieve this objective, the present invention provides a container comprising a synthetic paper tube having a multilayer structure including a moisture-proof inner layer and a metal lid fixed to at least one end of the synthetic paper tube. A slanted end surface is formed which is cut so as to be inclined rearward in the tube axis direction from the inner surface to the outer surface, and this end portion is curled and a metal lid is wrapped around it.

According to such a metal lid fixing structure, the moisture-proof inner layer, which is important on this type of composite container, can be sufficiently curled in an inverted shape to form a large fitting contact area with the metal lid, eliminating the risk of leakage. No safe composite containers can be used.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 5 show an embodiment of the composite container according to the present invention. 1 is a synthetic paper tube (including the tube, the same applies hereafter) that constitutes the container body, and a plurality of strips of material are wound in a spiral shape. It consists of a multilayer structure joined by heat sealing. In detail, 1
0 is a moisture-proof inner layer made of a waterproof/air-proof composite plastic film (including an aluminum vapor-deposited film), 11 is an intermediate layer, and one or more paper materials thicker than the moisture-proof inner layer 10 are used; The moisture-proof inner layer is spirally wound and glued. 12 is the exterior, which is made of composite film or synthetic paper with desired printing;
It is wrapped and glued around the outer circumference of the

Reference numeral 2 denotes a metal lid fixed to at least one end of the synthetic paper tube 1, which is made of a disc-shaped raw plate of aluminum or its alloy, and is wound around the end of the synthetic paper tube 1.

Although such a structure is similar to the conventional one, the present invention is characterized by the fixing structure A between the synthetic paper tube 1 and the metal lid 2. More specifically, the present invention provides a synthetic paper tube 1 to which a metal lid 2 is fixed, in advance a slanted end surface that is inclined at a predetermined angle α from the inner surface 4 to the outer surface 5 toward the rear in the tube axis direction, as shown in FIG. 6.

Then, the end of this synthetic paper tube is flanged outward, a blank plate of a metal lid is placed, and the tube is wrapped tightly. In the case of this flange processing, the end surface of the synthetic paper tube is not perpendicular to the tube axis, but is the oblique end surface 6 facing toward the rear of the tube axis as described above, and the length of the outer sheath 12 is longer than the moisture-proof inner layer 10. Because it is short, it is easy to bend outward, and because the moisture-proof inner layer 10 is long, it becomes an overhang-like curled portion 7 that sufficiently covers the surfaces of the intermediate layer 11 and the outer sheath 12, as shown in FIG.

After this flange processing, a blank plate for the metal lid is placed and tightened, so that the synthetic paper tube 1 and the metal lid 2 are mechanically completely integrated as shown in FIG. 2. That is, by wrapping around the flanged portion of the synthetic paper tube 1 during this processing, the raw plate forms a seam portion consisting of a flat plate portion 21, an inner rising wall 22, a top portion 23, an outer descending wall 24, and a biting end 25. At this time, in the present invention, the moisture-proof inner surface 10 forms the overhang-like curled portion 7 as described above. Therefore, the moisture-proof inner layer 10
2 or the top 23, but is in close contact over a wide area with the inner surface 26 that passes past the top 23 and reaches the outer descending wall 24 as shown in the figure, and the degree of fit between the moisture-proof inner layer 10 and the metal lid 2 is extremely high. It gets deeper. As a result, the flange effect and double seam effect are perfected, and there is no fear that the contents will leak due to high external or internal pressure. 13 is a compound.

Further, in the present invention, the sheath 12 into which the biting end 25 enters is formed short in advance, so that an excessive axial compressive force is not applied to the sheath 12 when tightening, and the wrinkles of the sheath 12 due to this are prevented. A beautiful outer surface can be formed without the generation of waves or waves.

FIG. 5 shows an embodiment in which the present invention is applied to a composite bottle container, in which the oblique end surface 6 is formed at the lower end of the synthetic paper tube 1 and the metal lid 2 is fixed to form the end structure A. , a plastic neck member 8 is adhered to the upper end side by a fork 81, and a screw portion 82 for attaching a cap is provided at the upper part of the plastic neck member 8.

Incidentally, the oblique end surface 6 of the synthetic paper tube 1 is formed when a long blank tube is cut to a desired length or in a separate process after cutting.For example, as shown in FIG. There is one in which a grinding plate 90 having a slope 92 that matches the blade edge slope 91 in the thickness direction of the cutting blade 9 is bonded. According to this means, oblique shaving is performed while cutting the raw pipe, and the oblique end surface 6 is formed in one process.

[Effect of idea]

According to the present invention described above, in a composite container using a synthetic paper tube, the degree of curl of the moisture-proof inner layer is deepened with a simple structure, the fit between the moisture-proof inner layer and the metal lid is deepened, and the contact area is increased. As a result, the flange effect and double seam effect are sufficient, making it possible to create a good composite container with no worries about leaks, and without causing waves or wrinkles on the exterior, increasing the product value. It has excellent features such as being able to

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing one embodiment of the composite container according to the present invention, FIG. 2 is a partially enlarged view thereof, and FIG. 3 is a partial vertical sectional view of the synthetic paper tube according to the present invention. Figure 4 is a cross-sectional view showing the flanged state, Figure 5 is a partially cutaway side view showing an embodiment in which the present invention is applied to a bottle container, and Figure 6 is a partial side view showing an example of a tool used in the present invention. Figure, 7th
The figure is a partial cross-sectional view showing the flange processing state of a conventional composite container, and FIG. 8 is a cross-sectional view of the metal lid fixing part. DESCRIPTION OF SYMBOLS 1...Synthetic paper tube, 2...Metal lid, 6...Slanted end surface, 10...Moisture-proof inner layer, 7...Overhang-shaped curl portion.

Claims (1)

[Scope of utility model registration request] In a container equipped with a synthetic paper tube having a multilayer structure including a moisture-proof inner layer and a metal lid fixed to at least one end of the synthetic paper tube, the end of the synthetic paper tube 1 has a tube axis line extending from the inner surface 4 to the outer surface 5. A composite container characterized in that a slanted end face 6 that slopes backward in the direction is formed, and this end is curled and a metal lid 2 is wrapped around it.