JPS604063B2 - Container manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates in particular to a method for manufacturing containers made of composite cans using composite materials.

In general, in addition to metal cans, composite cans whose side plates, lids, or bottom plates are made of paper, metal, synthetic resin, or composite materials of these are widely used. The manufacturing method begins with the fabric of a cylindrical side plate 1 made of metal or composite material as shown in Figure 1A.
In order to smoothly and completely tighten the lid 2 and the side plate 1, a mold is used in advance to bend and expand the metal lid 2 in an outward radial direction. A concave portion 2' into which the flower bending portion 1' can be inserted is formed, and then, as shown in the opening of the same figure, the lid 2 is placed on top of the side plate 1, and the lid 2 is rolled and tightened with a mold to form the side plate 1 and The lid 2 was fixed to the body in an unremovable manner.

In addition, the lid 2 described above is exactly the same even if it is considered as a bottom plate. However, such a conventional manufacturing method requires multiple steps, has a high defective rate, and requires a large amount of equipment, which naturally results in high costs.

In addition, as a conventional manufacturing method, as shown in Figs. 2 and 3, there is a method in which the side plate la is integrally formed by bonding the side plate la to the recess or inner surface of the lid 2a, but when composite materials are used, Since the product is integrally bonded with surface adhesive, the material may peel off due to vibrations, shocks, etc. during handling or transportation, and the lid or bottom may separate from the side plate.
It had drawbacks such as not being able to function as a container.

Two inventions of the present application have been made in order to eliminate the above-mentioned conventional drawbacks. First, the first invention has the following technical means.

A lid or a bottom plate having a circumferential recess formed on its periphery is molded from paper, metal, synthetic resin, or a composite material thereof.

This circumferential recess has an inner wall that is curved outwardly or inwardly of the lid or base plate. A side plate made of paper, metal, synthetic resin, or a composite material thereof is inserted into this circumferential recess. Then, by bending the tip of the side plate outward or inward along the curved inner wall of the circumferential recess, the side plate is moved into the circumferential recess so that the tip of the side plate engages with the inner wall of the circumferential recess. A container is manufactured by inserting the container under high pressure. In this manner, when the side plate is inserted with force into the circumferential recess having an inner wall curved outward or inward, the side plate bends outward or inward along the inner wall due to the pressure and engages with the inner wall.

Since the side plate engages with the inner wall of the circumferential recess while being bent outward or inward, the side plate is bent in a direction that opposes the tension acting in the longitudinal direction of the side plate (all around the circumferential axis). . Therefore, in order to remove the lid or the bottom plate from the side plate, the side plate must be deformed again and pulled out of the circumferential recess. The second invention aims to achieve the same object as the first invention by including the constituent features of the first invention and adding other constituent features thereto.

That is, the second invention is such that when inserting the side plate into the circumferential recess in the first invention, a means for facilitating the Z side plate and material deformation by heat, sound waves, etc. is added. As a result, the side plate is easily deformed by the action of the means for facilitating material deformation, and the side plate is more easily bent outward or inward and inserted into the circumferential recess.
Embodiments of the present invention will be described below based on the drawings. FIG. 4 shows an embodiment of the method for manufacturing a container according to the present invention. In FIG. The width of the opening □ 25 on the lower surface of the circumferential protrusion 4 is approximately equal to the thickness of the side plate 6 of the container, and the deep part 7 is large enough to accommodate the end of the side plate 6 of the container doubled. A circumferential recess 8, which is a space, is provided. The lid 3 having the circumferential recess 8 is molded from a composite material such as paper, synthetic resin such as plastic, metal, wood, and general packaging materials. and the fourth
As shown in the figure, an ultrasonic horn 9 is applied from the upper surface of the lid 3 to a portion corresponding to the circumferential recess 8 to close the recess 8 of the lid 3.
The end of the side plate 6 made of paper, metal such as aluminum, synthetic resin, or a composite material thereof is inserted in advance, and in this state, the lid is pressed downward with strong pressure using the ultrasonic horn 9, which functions as a pressing mold. Push in 3.

Then, the tip of the side plate 6 hits the inner wall of the deep part 7 of the recessed part 8 and bends along the inner wall, but due to the ultrasonic vibration, a gap is created between the inner wall of the deep part 7 of the lid 3 and the end of the side plate 6. occurs, the coefficient of friction becomes extremely small, and the inner wall of the deep part 7 and the side plate 6 become flexible or melt due to the heat generated by the ultrasonic waves.
The side plate 6 is easily bent twice while sliding along the inner wall of the deep part 7, and if this is large, the tip of the side plate 6 will finally come into contact with the side plate 6 itself, and the side plate 6 will be bent twice. It is welded to the inner wall of the circumferential recess 8 and is irremovably held by the lid 3, resulting in a highly airtight container. In other words, the container manufacturing method of the present invention allows the lid itself with an intervening recess to function as a mold, thereby eliminating the complicated flower bending process of conventional can containers and the lid or bottom. It is possible to omit the trouble of integrally rolling and tightening the side plate and the lid, as well as the fine adjustment of the mold and the management of the various devices and molds to form a uniform container. can be integrally molded and fixed by welding or the like as necessary.

In addition, in the above explanation, the diamond 3 may be formed on the bottom plate or on both the lid and the bottom plate, and the deep part 7 of the circumferential recessed part 8 does not necessarily double round the side plate 6. It is not so large that the side plates 6 can be accommodated, but the side plates 6 may be accommodated in a double layered manner, and for example, the width of the side plates 6 may be such that the side plates 6 expand due to heat in the deep part 7 and cannot be removed. It is sufficient if the space is larger than the thickness of 6.

Furthermore, it is not necessary to apply ultrasonic waves in the description of the manufacturing method, and if ultrasonic waves are not applied, it is sufficient to increase the press pressure when inserting the side plate under strong pressure.

However, when ultrasonic waves are not applied, the frictional resistance between the recessed part of the lid and the side plate is large, and there is a high probability that the side plate will be wrinkled or bent, resulting in poor workability.

Various methods can be considered to overcome this problem, such as heating, roughening the wall surface of the circumferential recess, or processing it by providing appropriate protruding lines, etc. These methods can improve workability to some extent. On the other hand, when ultrasonic waves are applied, the frictional resistance at the contact portion becomes extremely small, the side plate slides and is bent smoothly, and the material is softened by the generation of heat and bent even more smoothly.

Finally, it is preferable to use ultrasonic waves because the surface of the material can be melted and welded together if necessary, and a container with good workability and quality comparable to or better than conventional products can be obtained. FIG. 5 shows another embodiment of the method for manufacturing a container according to the present invention, and in the same figure, 4' and 4'' are an interstitial outer protrusion and a circumferential inner protrusion formed on the periphery of the lid 3; The protrusions 4', 4'' are molded integrally with the lid 3 from plastic or the like.

The width of the closing opening 5' between the two protrusions 4' and 4'' is approximately the width of the side plate 6.
When the side plate 6 is inserted with force from the entrance 5' of the lid 3, the end of the side plate 6 slides along the inner wall of the outer protrusion 4'.
Finally, as shown in the opening of the figure, the two protrusions 4' and 4'' are iron-fitted, and the lid 3 and the side plate 6 are integrated.

In this embodiment as well, the lid 3 may be used as the bottom plate 8, and it is preferable to use ultrasonic waves as in the previous embodiment. FIG. 6 shows still another embodiment of the method for manufacturing a container according to the present invention, in which the inner circumferential projection 4'' is provided on the inner side at a considerable distance from the outer circumferential projection 4', and the side plate 6 is When the lid 3 is inserted with strong pressure along the circumferential outer protrusion 4', the side plate 6 is bent along the inner wall and its tip comes into contact with the circumferential inner protrusion 4'', and then the circumferential inner protrusion 4'' is inserted into the side plate 6. When pressed, the side plate 6 is irremovably held by the lid 3.

Furthermore, it can be held securely by adhering or placing it on the insert. In this case as well, more efficient molding can be achieved by employing ultrasonic waves. 7 to 9 show examples of containers manufactured by the manufacturing method of the present invention,
FIG. 7 shows an openable and closable container manufactured by the method of the present invention, provided with a circumferential opening score 10, a closing handle 11, and a closing side score 12.

FIG. 8 shows a connection between the upper part 13 of a container such as a soybean oil bottle and the container body 14, which are connected by the method of the present invention, and 15 is a screw cap of the soybean oil bottle.

Furthermore, FIG. 9 shows a container manufactured by the method of the present invention provided with a circumferential score 16 for a closing opening and a handle 17 for closing. The present invention can of course be applied not only to cylindrical containers but also to prismatic cylindrical containers, tapered containers, and other arbitrary shaped containers, and can also be easily combined with packaging bags and the like.

As described above, the present invention has the following effects. First, in the first invention, the side plate is bent outward or inward to engage with the inner wall of the circumferential recess of the lid or the bottom plate.

Therefore, the rhombus or bottom plate and the side plate can be connected by a very easy operation of inserting the side plate with force.

Furthermore, the side plate once inserted will not come out of the circumferential recess unless it is deformed again, so the above-mentioned connection can be made strong. In the second invention, since the side plates are easily deformed by heat, sound waves, etc., the diamond or bottom plate and the side plates are reliably and beautifully joined.

[Brief explanation of the drawing]

Figure 1A, the opening is an explanatory diagram of the conventional container manufacturing method, Figures 2 and 3 are both partial cross-sectional views of the conventional container, Figure 4A,
The opening is an explanatory diagram of one embodiment of the manufacturing method of the container of the present invention, FIG. 5 A, and the opening is an explanatory diagram of another embodiment of the manufacturing method of the present invention, FIG.
The opening is an explanatory diagram of still another embodiment of the manufacturing method of the present invention, and FIGS. 7 to 9 are views showing containers manufactured by the container manufacturing method of the present invention, respectively. 3... Lid or bottom plate, 4... Circumferential projection, 4'... Circumferential outer projection, 4''... Circumferential inner projection, 5... ...Sekiguchi of the circumferential recess, 6...
Side plate, 7...Deep part of circumferential recess, 8...
... Circumferential recess. Fig.1 Pig Fig.2 Fig.3 Fig. Pig4 Fig.5 Fig.5

Claims (1)

[Scope of Claims] 1. A lid or bottom plate having a circumferential recessed portion having an inner wall curved outwardly or inwardly formed on the periphery of the lid or bottom plate is made of paper, metal, synthetic resin, or a composite material thereof. A side plate made of metal, synthetic resin, or a composite material thereof is inserted into the circumferential recess of the lid or bottom plate, and the tip of the side plate is inserted into the curved inner wall of the circumferential recess. The side plate is inserted into the circumferential recess with force so that the tip of the side plate engages with the inner wall of the circumferential recess by bending outward or inward along the circumferential recess. Container manufacturing method. 2. The circumferential recess is formed by an outer circumferential protrusion and an inner circumferential protrusion provided on the periphery of the lid or bottom plate, the width of the opening is approximately equal to the thickness of the side plate of the container, and the circumferential recess is Claim 1: When the side plate is inserted into the recessed part under strong pressure, the side plate is curved and deformed between the inner and outer circumferential protrusions.
Method of manufacturing the container described in Section 1. 3. A space in which the circumferential recess is provided in a circumferential protrusion provided on the periphery of the lid or the bottom plate, and the width of the opening is approximately equal to the thickness of the side plate of the container, and the deep part thereof is wider than the thickness of the side plate of the container. When the side plate is inserted into the circumferential recess with force, the tip of the side plate is deformed along the deep inner wall of the circumferential recess, and the side plate is irremovably held by the lid or bottom plate. A method for manufacturing the container according to item 1. 4. The circumferential recessed portion is formed by an outer circumferential protrusion and an inner circumferential protrusion provided on the periphery of the lid or the bottom plate, and the side plate is inserted with force so as to be deformed along the inner wall of the outer circumferential protrusion. 2. A method for manufacturing a container according to claim 1, wherein the circumferential inner protrusion is then pressed into contact with the side plate, and the side plate is irremovably held by the lid or the bottom plate. 5 A lid or bottom plate having a circumferential recessed portion having an inner wall curved outwardly or inwardly formed on the periphery of the lid or bottom plate is molded from paper, metal, synthetic resin, or a composite material thereof, and the lid or bottom plate is A side plate made of paper, metal, synthetic resin, or a composite material thereof is inserted into the circumferential recess of the bottom plate, and the tip of the side plate is moved outward or inward along the curved inner wall of the circumferential recess. While adding means to facilitate material deformation such as heat and sound waves so that the tip of the side plate engages with the inner wall of the circumferential recess by bending,
A method for manufacturing a container, characterized in that the side plate is inserted into the circumferential recessed part under strong pressure. 6. The circumferential recess is formed by an outer circumferential protrusion and an inner circumferential protrusion provided on the periphery of the lid or bottom plate, the width of the opening is approximately equal to the thickness of the side plate of the container, and the circumferential recess is 6. The method of manufacturing a container according to claim 5, wherein when the side plate is inserted into the recessed part under strong pressure, the side plate is curved and deformed between the inner circumference and the outer circumference. 7. A space in which the circumferential recess is provided in a circumferential protrusion provided on the periphery of the lid or the bottom plate, and the width of the opening is approximately equal to the thickness of the side plate of the container, and the deep part thereof is wider than the thickness of the side plate of the container. When the side plate is inserted into the circumferential recess with force, the tip of the side plate is deformed along the deep inner wall of the circumferential recess, and the side plate is irremovably held by the lid or bottom plate. A method for manufacturing the container according to item 5. 8. The circumferential recessed portion is formed by an outer circumferential protrusion and an inner circumferential protrusion provided on the periphery of the lid or the bottom plate, and the side plate is subjected to strong pressure so as to be deformed along the inner wall of the outer circumferential protrusion. 6. The method for manufacturing a container according to claim 5, wherein after insertion, the circumferential inner protrusion is pressed against the side plate, and the side plate is irremovably held by the lid or the bottom plate. 9. The side plate is bonded or welded to the inner wall of the circumferential recess by a step of adding a means to facilitate material deformation due to heat, sound waves, etc. that occurs when inserting the side plate into the circumferential recess under strong pressure. Claims 5 to 8 characterized by
The manufacturing method described in any of the paragraphs. 10 Accompanied by forceful insertion of the side plate into the circumferential recess,
Claims 5 to 5, wherein the step of adding means for facilitating material deformation using heat, sound waves, etc. is a step of applying ultrasonic waves to a position corresponding to the circumferential recess on the top surface of the lid or the bottom surface of the bottom plate. A method for manufacturing a container according to any of Item 9.