JP3382342B2 - Container lid and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a simple container lid for containing food and the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a simple container lid for containing food, there is a container lid shown in FIG. In the lid of the container, a paper-made circular top plate 10 is fitted in the upper inside of a paper-made short cylindrical peripheral wall 1, and an upward bent portion 30 formed on a peripheral edge portion 11 of the top plate 10 is provided on the peripheral wall 1. The top plate 10 is attached to the upper part of the peripheral wall 1 by being held and fixed by a downward bent portion 31 formed by bending the upper end portion by 180 degrees.

[0003]

The lid of the container shown in FIG. 7 has an upward bent portion 3 formed on a peripheral edge portion 11 of a top plate 10.
It is difficult to carry out all the work of holding 0 by the machine at the downward bent portion 31 formed by bending the upper end portion of the peripheral wall 1 by 180 degrees, which requires manpower, and the work efficiency is poor. , Cost increased.

If the lid is entirely made of synthetic resin, it is usual to dispose of the lid of this type after it has been used once, which will promote pollution. The present invention has been made in view of the above matters, and a lid of a container provided with a paper-made top plate is configured to be efficiently assembled, and as a manufacturing method that can be efficiently manufactured, it can be formed at low cost. To do this is a technical issue.

[0005]

A first aspect of the present invention is to provide a short cylindrical peripheral wall 1 made of synthetic resin, an annular groove 2 is provided on an inner peripheral surface near an upper end of the peripheral wall 1, and the annular groove 2 is provided. 2 is attached to the lid of the container in which the peripheral portion 11 of the paper-made top plate 10 is fitted and fixed.
The lower edge of the top plate 10 to bend downward.
Forming the part 12 and elastically inserting the bent part 12 into the annular groove 2.
It was used as a lid for the container.

[0006] The second invention is, on the top plate 10 of the first invention
The upper surface plate 20 made of paper is overlaid on the surface, and the upper surface plate 20
The outer peripheral portion 21 was also inserted into the annular groove 2 to form a container lid.

In the third invention, the inner diameter of the lower projection 4 of the annular groove 2 is made smaller than the inner diameter of the lower portion of the peripheral wall 1 of the first and second inventions, and the lower portion of the inner surface of the peripheral wall 1 is formed. The surface extending from the lower projection 4 to the lower projection 4 is formed as an inclined surface 5, and the inner diameter of the upper projection 3 of the annular groove 2 is made smaller than the inner diameter of the lower projection 4 of the annular groove 2 to form a container lid. .

A fourth aspect of the present invention is to provide a short cylindrical peripheral wall 1 made of synthetic resin, and an annular groove 2 on the inner peripheral surface near the upper end of the peripheral wall 1.
The peripheral wall 1 is fitted into the cylindrical body 40, and the paper-made top plate 10 formed in a flat plate shape inside the peripheral wall 1 is pushed from the side of the peripheral wall 1 where the annular groove 2 is not provided. The end face 48 of the top plate 10 is pressed and pushed in to form a bent portion 12 on the peripheral portion 11 of the top plate 10, and the bent portion 12 is formed into the annular groove 2.
And the top plate 10 is fixed to the peripheral wall 1 by a method of manufacturing a container lid.

[0009]

[0010]

In the first aspect of the present invention, the top plate 10 having a diameter larger than the inner diameter of the annular groove 2 is inserted into the peripheral wall 1, and the top plate 10 is inserted.
Is pressed by the end surface 48 of the pressing body 47. Then, the tip portion of the peripheral edge portion 11 of the top plate 10 is bent toward the pushing body 47 side to form the bent portion 12, and the bent portion 12 is elastically inserted into the annular groove 2 to remove the top plate 10. Fix it so that it will not stick. The top plate 10 has a bent portion 12
It is also possible to pre-assemble and then assemble.

[0011] The second invention, further, insert the top plate 10, overlapping the upper surface plate 20 on the upper surface of the top plate 10, the upper plate
By inserting the outer peripheral portion 21 of 20 into the annular groove, the top plate 1
The strength of 0 is secured, and the bent portion 12 of the top plate 10 is thinned so that the bent portion 12 can be bent easily.

In the third aspect of the invention , the inner diameter of the upper protrusion 3 of the annular groove 2 is smaller than the inner diameter of the lower protrusion 4 of the annular groove 2 of the peripheral wall 1. The peripheral portion 11 of the top plate 10 can be reliably stopped by the upper protrusion 3, and the peripheral portion 11 can easily pass through the lower protrusion 4.

Further, since the surface from the lower part of the peripheral wall 1 to the lower projection 4 is the inclined surface 5, the peripheral edge part 11 of the top plate 10 is formed.
However, it is easily bent and easily passes through the lower protrusion 4.

In the invention of the method for manufacturing the lid of the container, since the peripheral wall 1 is fitted into the cylindrical body 40 and the top plate 10 is pushed into the peripheral wall 1 by the pusher 47, the top plate 10 is strongly pressed by the pusher 47. Even if the peripheral wall 1 is held by the tubular body 40 and is not deformed,
The peripheral portion 11 of the top plate 10 is easily bent to form a bent portion 12, which is fitted into the annular groove 2 of the peripheral wall 1 to move the top plate 10 to the peripheral wall 1.
Fasten to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show one embodiment of the container lid of the present invention. In this embodiment, the peripheral wall 1 is made of a synthetic resin made of polypropylene, the outer diameter of the upper portion is 67 mm, the outer diameter of the lower portion is 68 mm, and the lower portion is slightly enlarged.

An annular groove 2 having a width of about 3 mm is provided on the inner peripheral surface near the upper end of the peripheral wall 1. The peripheral wall 1 is formed so that the inner diameter of the lower protrusion 4 of the annular groove 2 is smaller than the inner diameter of the lower portion so that the lower protrusion 4 protrudes inward. The diameter is smaller than the inner diameter of the protrusion 4 and protrudes inward.

The inner diameter of the peripheral wall 1 is the largest at the lower end, and the surface extending from the lower end of the peripheral wall 1 by about 10 mm to the lower projection 4 of the annular groove 2 is slightly steep.
It is formed on.

The top plate 10 fitted in the annular groove 2 is made of paper and has a lower surface coated with a synthetic resin, and a peripheral portion 11 is formed with a bent portion 12 bent downward. FIG. 4 shows an embodiment of a container lid of another invention, and the same parts as those of the embodiment of the invention described above are designated by the same reference numerals and the description thereof is omitted.

In this embodiment, a paper-made upper plate 20 is further provided on the upper surface of the top plate 10, and an outer peripheral portion 21 of the upper plate 20 is also fitted in the annular groove 2. In this embodiment, the top plate 10 is reinforced by the top plate 20 to secure the strength, and the bent portion 12 of the top plate 10 is thinned to make the bent portion 12.
It is designed to allow easy bending.

Then, the peripheral edge portion 1 of the top plate 10 of the above embodiment
1 is provided with a bent portion 12, but this bent portion can be removed. However, the top plate 10 can be more tightly fixed to the peripheral wall 1 by providing the bent portion 12.

5 to 7 are views for explaining one embodiment of the method for manufacturing the lid of the container of the present invention. In this embodiment, a metal tubular body 40 made of steel is installed on the upper surface of a steel base plate 37. The tubular body 40 has a lower inner diameter of 67.
mm, the inner diameter of the upper part is 68 mm.

Then, the peripheral wall 1 described in the embodiment of the lid of the container shown in FIGS. 1 to 3 is inverted and fitted into the cylindrical body 40. Then, the outer peripheral surface of the peripheral wall 1 becomes the cylindrical body 4.
The inner peripheral surface of 0 is abutted and fitted.

Then, an upper cylinder 43 made of steel is placed on the cylinder 40 in an overlapping manner. The inner diameter of the upper cylinder 43 is approximately 69 mm, and the inner peripheral surface of the upper cylinder 43 is formed to be substantially flush with the inner peripheral surface of the peripheral wall 1 below the upper cylinder 43. A top plate mounting step 44 is provided in the opening.

Next, the paper-made top plate 10 formed in a flat plate shape is mounted on the top plate mounting step portion 44. The top plate 10 has a diameter of about 4 mm from the inner diameter of the annular groove 2 of the peripheral wall 1.
It is formed as a flat circular plate with a thickness of about 0.5 mm, which is formed to have a large diameter and is coated and impregnated with resin on the entire lower surface or the entire upper and lower surfaces.

Next, the top plate 10 is pressed by the end face 48 of a pusher body 47 made of steel and formed in a cylindrical shape.
7 has a diameter smaller than the inner diameter of the annular groove 2 by about 1 mm to 2 mm, and its corners are slightly chamfered.

Then, in the top plate 10, the distal end of the peripheral edge portion 11 is bent toward the pushing body 47 side to form the bent portion 12, and the bent portion 12 is compressed and inserted into the annular recessed groove 2 to elastically move. The top plate 10 is tightly fixed so as not to rattle.

In the method of manufacturing the lid of the container described above, the peripheral wall 1 is inserted into the solid metal cylinder 40 to fix the top plate 10 to the peripheral wall 1, but without using the cylindrical body, It is also possible to fix the top plate 10 to the peripheral wall 1.

[0028]

According to the present invention, the peripheral wall 1 is made of synthetic resin, the peripheral wall 1 is provided with the annular groove 2, and the peripheral edge portion 11 of the paper-made top plate 10 is fitted into the annular groove 2. Therefore, the lid made of paper can be assembled only by pushing the top plate 10 into the peripheral wall 1, and the lid can be assembled by a mechanical device and can be molded at low cost.

The bent portion 1 is formed on the peripheral portion 11 of the top plate 10.
In the case where the top plate 10 is formed, the bending portion 12 can be formed by a mechanical device while fitting the top plate 10 into the annular groove 2 of the peripheral wall 1, and the bending portion 12 of the top plate 10 can be tightly fitted in the annular groove 2 without manpower. It is possible to mold a lid that is elastically fitted with.

Even if the bent portion 12 is formed in advance, the bent portion 12 can be formed by a mechanical device and the lid provided with the paper-made top plate 10 can be formed at low cost without requiring manpower.

The inner diameter of the lower protrusion 4 is smaller than the inner diameter of the lower portion of the peripheral wall 1, and the surface extending from the lower portion of the peripheral wall 1 to the lower protrusion 4 is formed as an inclined surface 5. In the case where the inner diameter of the upper protrusion 3 is smaller than that of the upper protrusion 3, the peripheral portion 11 of the top plate 10 pushed at the time of assembly can be reliably stopped by the upper protrusion 3, and the peripheral portion 11 easily passes through the lower protrusion 4. It is easier to assemble with a mechanical device.

If the surface from the lower portion of the peripheral wall 1 to the lower protrusion 4 is an inclined surface, the peripheral portion 1 of the top plate 10
1 can be easily bent and can more easily pass through the lower protrusion 4, and can be easily molded.

In the invention of the method of manufacturing the lid of the container, since the peripheral wall 1 is fitted into the tubular body 40 and the top plate 10 is pushed by the pushing body 47, the pushing body 47 is formed to have a large diameter. Four
Even when the peripheral edge 11 of the top plate 10 is strongly pressed by 7, the peripheral wall 1 is not deformed, and the peripheral edge 11 is bent to form a bent portion 12, and the bent portion 12 is tightly fitted into the annular groove 2. Therefore, the bent portion 12 has elasticity, and the lid of the container in which the top plate 10 made of paper is fixed to the peripheral wall 1 can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a container lid of the present invention.

FIG. 2 is a partial cross-sectional view of an embodiment of the lid of the container of the present invention, which is an enlarged view of the other drawings.

FIG. 3 is a half-cut plan view of an embodiment of the container lid of the present invention.

FIG. 4 is a cross-sectional view of another embodiment of the container lid of the present invention.

FIG. 5 is a diagram for explaining the manufacturing method of the present invention.

FIG. 6 is a diagram for explaining the manufacturing method of the present invention.

FIG. 7 is a sectional view of a conventional example.

[Explanation of symbols]

1 peripheral wall 2 annular groove 3 Upper protrusion 4 Lower protrusion 5 inclined surface 10 Top plate 11 Perimeter 12 Bend 20 Top plate 40 cylinder 47 Pusher 48 end face

Claims (4)

(57) [Claims] 1. A short cylindrical peripheral wall 1 made of synthetic resin is provided, and an annular groove 2 is provided on an inner peripheral surface near the upper end of the peripheral wall 1. In the annular groove 2, a peripheral edge of a paper-made top plate 10 is provided. In the lid of the container in which the portion 11 is fitted and fixed, the peripheral portion 11 of the top plate 10
A lid of a container, characterized in that a bent portion (12) bent downward is formed, and the bent portion (12) is elastically inserted into the annular groove (2). 2. The lid for a container according to claim 1, wherein a paper-made upper plate 20 is provided on the upper surface of the top plate 10, and an outer peripheral portion 21 of the upper plate 20 is also inserted into the annular groove 2. 3. The inner diameter of the lower protrusion 4 of the annular groove 2 is made smaller than the inner diameter of the lower portion of the peripheral wall 1, and the surface from the lower inner surface of the inner wall 1 of the peripheral wall 1 to the lower protrusion 4 is inclined surface 5. The lid of the container according to claim 1, wherein the inner diameter of the upper protrusion 3 of the annular groove 2 is smaller than the inner diameter of the lower protrusion 4 of the annular groove 2. 4. A short cylindrical peripheral wall 1 made of synthetic resin is provided, an annular groove 2 is provided on an inner peripheral surface near the upper end of the peripheral wall 1, the peripheral wall 1 is fitted in a cylindrical body 40, and From the side of the peripheral wall 1 where the annular groove 2 is not provided, the top plate 10 made of a flat plate in the peripheral wall 1 is pressed by the side surface 48 of the pressing body 47 and pushed into the peripheral edge portion 11 of the top plate 10. A method of manufacturing a container lid, in which a bent portion 12 is formed, the bent portion 12 is fitted into the annular groove 2, and the top plate 10 is fixed to the peripheral wall 1.