JP2001322639A - Processing of tubular container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing method for a tubular container which can be fitted certainly into dents formed at the bottom member or the tubular member. Without freaking protuberances formed at a thin tubular member or a bottom member. SOLUTION: The bottom member 12 being put over a forming mold 40 is inserted into the lower opening of the tubular member 11, and a pressure is applied by heating with a heating bar 43 to the outer circumferential face of the tubular member 11 and thereby the tubular member 11 and the surrounding wall 14 of the bottom member 12 are deformed under the heat along shaping dents 41. Then, while the dents 14a are formed at the surrounding wall 14 of the bottom member 12, the protuberances 11a each to be fitted into each of the dents 14a are formed simultaneously at the tubular member 11, and thereby the bottom member 12 is held by the tubular member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bottom member having an annular peripheral wall connected to the peripheral edge of a bottom plate at the lower end opening of a thin cylindrical member formed of synthetic resin. The present invention relates to a method for manufacturing a cylindrical container.

[0002]

2. Description of the Related Art As containers for storing articles, for example,
FIGS. 13A and 13B show examples. The container 1 includes a cylindrical member 11 formed of a plastic sheet, and a bottom member 12 and a lid member 15 for closing a lower end opening and an upper end opening of the cylindrical member 11, respectively. 12 and the lid member 15 are the bottom plate 1
Annular peripheral walls 14 and 17 are connected to the peripheral edges of the cover 3 and the cover plate 16, respectively.

As shown in FIG. 14, a convex portion 11a and a concave portion 14a are formed on the inner peripheral surface of the cylindrical member 11 and the outer peripheral surface of the peripheral wall 14 of the bottom member 12, respectively. In a state where the bottom member 12 is fitted into the lower end opening of the cylindrical member 11, the convex portion 11a formed on the cylindrical member 11 and the concave portion 14a formed on the peripheral wall 14 of the bottom member 12 are fitted to each other. Thereby, the bottom member 12 is held by the tubular member 11.

In general, such a cylindrical container 1 is manufactured by manufacturing the cylindrical member 11, the bottom member 12, and the lid member 15 in separate steps, and then attaching the bottom member 12 to the cylindrical member 11. However, in such a case, it is conceivable to attach the bottom member 12 to the tubular member 11 by the following method.

First, when manufacturing the tubular member 11 and the bottom member 12, as shown in FIG. 15, a convex portion 11 a is provided on the inner peripheral surface of the tubular member 11 and the outer peripheral surface of the peripheral wall 14 of the bottom member 12 is provided. The concave portions 14a are formed in advance, and the bottom members 12 are forcibly fitted into the lower end openings of the cylindrical members 11 so that the convex portions 11a formed in the cylindrical members 11 are formed in the concave members formed in the bottom members 12. The bottom member 12 is held on the cylindrical member 11 by forcibly fitting the bottom member 12 into the cylindrical member 11.

[0006]

As described above, the protrusion 11a and the recess 14a formed on the tubular member 11 and the bottom member 12, respectively, are fitted to each other, so that the bottom member 12 has a cylindrical shape. In the cylindrical container 1 held by the member 11,
The larger the fitting amount of the concave and convex portions fitted to each other, that is, the larger the protrusion amount of the convex portion 11a and the concave amount of the concave portion 14a into which the convex portion 11a is fitted, the larger the cylindrical member 11 becomes.
Since it is difficult for the bottom member 12 to fall off from the bottom, in such a cylindrical container 1, it is desirable that the fitting amount of the concave and convex portions be as large as possible.

However, if the body member 11 having the convex portion 11a is formed of a thin plastic sheet or the like, it is not possible to secure sufficient strength and shape retention for the convex portion 11a. And the convex portion 11
When a method is adopted in which the bottom member 12 having the concave portion 14a formed in advance is forcibly fitted into the cylindrical member 11 in which a is formed in advance, thereby holding the bottom member 12 in the cylindrical member 11. As shown in FIG.
When the upper end portion of the cylindrical member 11 passes through the convex portion 11a of the tubular member 11,
The protruding portion 11a is easily crushed by the bottom member 12, and as shown in FIG. 2B, when the bottom member 12 is fitted into the tubular member 11, the protruding portion 11a is
Cannot be fitted sufficiently.

Therefore, as long as the above-described method is employed, when a convex portion is formed on a cylindrical member or a bottom member formed of a thin synthetic resin sheet or the like, the fitting amount of the concave / convex portion is increased. Therefore, there is a problem that it is difficult to manufacture a cylindrical container in which the bottom member is securely held by the cylindrical member.

Accordingly, an object of the present invention is to make it possible to securely fit a concave portion formed in a bottom member or a cylindrical member without crushing a convex portion formed in a thin cylindrical member or a bottom member. An object of the present invention is to provide a method for manufacturing a cylindrical container.

[0010]

Means for Solving the Problems and Their Effects To solve the above-mentioned problems, the invention according to claim 1 is directed to forming a thin cylindrical member formed of a synthetic resin in a lower end opening of the cylindrical member. Further, in the method for manufacturing a cylindrical container in which a thin bottom member in which an annular peripheral wall is continuously connected to a peripheral edge of a bottom plate is fitted, after the bottom members are fitted in a lower end opening of the tubular member, they are mutually connected. By partially hot-pressing the superimposed body member and the peripheral wall of the bottom member, uneven portions to be fitted to each other are simultaneously formed on both the body member and the peripheral wall of the bottom member. It is.

[0011] As described above, in this manufacturing method, in the state where the bottom member is fitted into the lower end opening of the cylindrical member, the concave and convex portions which are fitted to each other are simultaneously formed on the peripheral wall of the cylindrical member and the bottom member. Therefore, in order to securely hold the bottom member on the cylindrical member, even when forming a large protrusion on the thin cylindrical member or the bottom member, without crushing the protrusion,
It is possible to securely fit into the concave portion formed in the bottom member or the cylindrical member.

According to another aspect of the present invention, an annular peripheral wall is connected to a peripheral edge of a bottom plate at a lower end opening of a thin cylindrical member formed of a synthetic resin. In the method for manufacturing a cylindrical container fitted with a synthetic resin bottom member, the bottom member having a concave portion formed on the peripheral wall of the bottom member in a contact surface with the cylindrical member is formed by opening a lower end of the cylindrical member. After being fitted into the body member, a portion of the body member corresponding to the recess formed in the peripheral wall of the bottom member is hot-pressed, so that the projection fitted to the recess formed in the bottom member is formed into the body member. It was formed in.

As described above, according to this manufacturing method, with the bottom member having the concave portion formed in the peripheral wall previously fitted in the lower end opening of the cylindrical member, the convex portion fitted into the concave portion is formed on the body member. In order to securely hold the bottom member on the cylindrical member, even when a convex portion having a large protrusion amount is formed on the thin-walled cylindrical member, the convex portion is formed without crushing the convex portion. It is possible to securely fit into the recess formed in the peripheral wall.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a cylindrical container shown in FIG. 11 will be described below. The cylindrical container 1 shown in FIG.
As described above, the cylindrical member 11 formed in a cylindrical shape,
The tubular member 11 is composed of a bottom member 12 and a lid member 15 that close the lower end opening and the upper end opening, respectively, and are manufactured by different processes.

First, as shown in FIG. 1, the cylindrical member 11 is formed by folding a plastic sheet S having a thickness of about 0.2 to 1.0 mm made of polypropylene, polyester, or the like into a crease (for example, Japanese Patent Application Laid-Open No. H10-193450). No. 4, JP-A-64-40317 and JP-A-4-9345), and after applying an adhesive to a margin portion c formed at one end side, the adhesive is applied. Glue margin part c
Is folded back, overlapped on the other end side and adhered to form a cylindrical shape. At this time, the tubular member 11 is in a state of being folded flat.

On the other hand, as shown in FIGS. 2A and 2B,
After the same plastic sheet S is pressure-formed using the molding die 30, the unnecessary portion X is cut off, so that the circular bottom plate 13 and the bottom portion where the annular peripheral walls 14 and 15 are connected to the peripheral edges of the lid plate 16 respectively. The material 12 and the lid member 15 are formed. The bottom member 12 has a size such that the outer peripheral surface of the peripheral wall 14 is in contact with the inner peripheral surface of the cylindrical member 11, and the lid member 15 has the inner peripheral surface of the peripheral wall 17 Has a size that comes into contact with the outer peripheral surface of the.

The cylindrical member 11 manufactured as described above
In order to attach the bottom member 12 to the cylindrical member 1, first, as shown in FIG. 3, the cylindrical member 11 is opened in a cylindrical shape, and then the molding die 40 covered with the bottom member 12 is raised.
The bottom member 12 is inserted into the lower end opening of the first member.

As shown in FIGS. 3 and 4, the molding die 40 is a block body having a substantially octagonal cross section which comes into contact with the inner peripheral surface of the peripheral wall 14 of the bottom member 12 at four points. A shaping recess 41 is formed in each of the contact portions with the peripheral wall 14.

When the bottom member 12 is inserted into the lower end opening of the tubular member 11 in this manner, as shown in FIG. 5, the heating bar 43 fittable into the shaping recess 41 approaches from the outside. By applying heat pressure (pressing while heating) from the outer peripheral surface side of the cylindrical member 11, the peripheral wall 1 of the cylindrical member 11 and the bottom member 12 is formed.
4 is thermally deformed along the shaping recess 41 of the molding die 40, thereby forming a recess 14a in the peripheral wall 14 of the bottom member 12, and simultaneously forming the cylindrical member 11 with a projection 11a fitted into the recess 14a. Then, the bottom member 12 is held by the tubular member 11 (see FIG. 6).

In this way, the bottom member 12 is
When held at 1, the mold 40 is removed from the bottom member 12 by lowering the mold 40. At this time, FIG.
As shown in FIG. 5, the lower end portion of the cylindrical member 11 and the peripheral wall 14 of the bottom member 12 are deformed so as to approach the non-contact surface 42 side of the forming die 40, so that the concave portion 14 a becomes the shaping concave portion 41 of the forming die 40. , And the bottom member 12 is easily detached from the mold 40. In FIG. 7, the state before deformation is indicated by a dashed line.
The state after the deformation is shown by a solid line.

As described above, in this manufacturing method, with the bottom member 12 fitted in the lower end opening of the cylindrical member 11,
Since the convex portion 11a and the concave portion 14a to be fitted to each other are simultaneously formed on the peripheral wall 14 of the cylindrical member 11 and the bottom member 12, a thin wall is required to securely hold the bottom member 12 on the cylindrical member 11. Tubular member 1 made of plastic sheet
Even when the protrusion 11a having a large protrusion amount is formed on the bottom member 1, the protrusion 11a can be securely fitted to the recess 14a formed in the bottom member 12 without crushing the protrusion 11a. This makes it possible to easily manufacture a cylindrical container in which the bottom member does not easily fall off as compared with the conventional manufacturing method.

In this embodiment, the protrusions 11a formed on the cylindrical member 11 are fitted into the recesses 14a formed on the peripheral wall 14 of the bottom member 12, so that the bottom member 12
The cylindrical container 1 for holding the cylindrical member 11 in the cylindrical member 11 has been described. However, the present invention is not limited to this, and the concave portion 11b formed on the inner peripheral surface of the cylindrical member 11 as shown in FIG.
The convex portion 1 formed on the outer peripheral surface of the peripheral wall 14 of the bottom member 12
4b, the bottom member 12 is turned into the cylindrical member 1
The manufacturing method of the present invention can also be applied to the cylindrical container 2 held in 1.

In this case, however, as shown in FIG. 2B, a molding die 40a having a shaping recess 41a on the inner peripheral surface is disposed outside the cylindrical member 11, and heating is performed from inside the bottom member 12. It goes without saying that the peripheral wall 14 of the bottom member 12 and the cylindrical member 11 must be heated and pressed by the bar 43a.

Also, in the above-described embodiment, the inverted tray-shaped bottom member 12 having the annular peripheral wall 14 hanging downward from the peripheral edge of the bottom plate 13 is fitted in the lower end opening of the cylindrical member 11 and attached. Although the container 1 has been described, the present invention is not limited to this. As shown in FIG. 9A, a tray-shaped bottom member 12 having an annular peripheral wall 14 rising upward from the peripheral edge of the bottom plate 13 is provided. A concave portion 11 formed on the outer peripheral surface of the cylindrical member 11 by externally fitting into the lower end opening of the cylindrical member 11.
b, the convex portion 1 formed on the inner peripheral surface of the peripheral wall 14 of the bottom member 12
4b, the bottom member 12 is turned into the cylindrical member 1
Needless to say, the manufacturing method of the present invention can be applied to the cylindrical container 3 held in the container 1. However, in this case, as shown in FIG. 3B, the molding die 40b having the shaping recess 41b formed on the inner peripheral surface is attached to the cylindrical member 11 as shown in FIG.
And the peripheral wall 14 of the tubular member 11 and the bottom member 12 needs to be heated and pressed from the outside by the heating bar 43b.

In the above-described embodiment, the bottom member 12 formed by pressure-forming the thin plastic sheet S is replaced with the cylindrical member 1 made of the same plastic sheet S.
1 has been described, but the present invention is not limited to this. For example, as shown in FIG. 10, a thick bottom member 2 in which a concave portion 21 is formed in advance on the outer peripheral surface.
After the bottom member 20 is covered with the holding member 40c, the bottom member 20 is fitted into the lower end opening of the cylindrical member 11 formed of a thin plastic sheet, and then the heating bar 43c is formed from the outside. It is also possible to form a convex part which fits into the concave part 21 of the bottom member 20 in the cylindrical member 11 by hot-pressing the cylindrical member 11 with.

Further, in each of the above-described embodiments, the circular convex portion 11a and the concave portion 11b formed on the cylindrical member 11 are
Circular concave portions 14a and convex portions 14 formed on the bottom member 14
b, the cylindrical containers 1, 2, 3, etc., which hold the bottom member 14 on the cylindrical member 11 by fitting, however, the uneven fitting portion is not limited to such a circular shape. Instead, for example, as shown in FIGS. 11A and 11B, a plurality of protrusions 11d formed on the cylindrical member 11 and a plurality of grooves 14d formed on the peripheral wall 14 of the bottom member 12 are fitted. The bottom member 14 may be held by the tubular member 11 by being combined. However, in this case, as shown in FIG. 3C, a plurality of molding dies 40d each having a shaping recess 41d extending in the circumferential direction formed on the outer peripheral surface are disposed inside the bottom member 12, and the shaping recess 41d is provided. Heating bar 43b fitted to
Accordingly, it is necessary to heat-press the peripheral wall 14 of the cylindrical member 11 and the bottom member 12 from outside.

In the above-described embodiment, the bottom member 12 is manufactured by pressure-forming the plastic sheet S. However, the present invention is not limited to this. Needless to say, the material 12 can be manufactured.

In the above-described embodiment, a plurality of concave / convex fitting portions are simultaneously formed by simultaneously applying heat and pressure to a plurality of locations using a mold having a plurality of shaping recesses and a plurality of heating bars. However, the present invention is not limited to this. It is also possible to form a plurality of concave and convex fitting portions by sequentially applying heat pressure one by one using a mold having a single shaping recess and a single heating bar. is there.

In the above-described embodiment, the cylindrical member 1
1 and the convex portion 11 formed simultaneously on the peripheral wall 14 of the bottom member 12
The bottom member 12 is held on the cylindrical member 11 by simply fitting the concave member 14a with the concave portion 14a. For example, the bottom member 12 is thermally bonded to the contact surface between the cylindrical member 11 and the peripheral wall 14 of the bottom member 12, respectively. When the conductive resin layer is formed, and the convex portion 11a and the concave portion 14a are formed by applying heat and pressure, and the two are thermally bonded at the same time, the bottom member 12 is more securely held on the cylindrical member 11. There is an effect that can be.

Further, in the above-described embodiment, the cylindrical container 1 having a circular cross section has been described. However, the present invention is not limited to this.
As shown in (b), the cross-sectional shape of the cylindrical member 11 can be applied to a cylindrical container having an elliptical shape or a polygonal shape, and further, various cross-sectional shapes as shown in FIG. .

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for producing a cylindrical container according to the present invention.

FIGS. 2 (a) and 2 (b) are process diagrams showing a method for manufacturing the above cylindrical container.

FIG. 3 is a process chart showing a method for producing the cylindrical container of the above.

FIG. 4 is a cross-sectional view showing a molding die used when manufacturing the cylindrical container.

FIG. 5 is a process chart showing a method for manufacturing the cylindrical container of the above.

FIG. 6 is a process chart showing a method for producing the cylindrical container of the above.

FIG. 7 is a schematic view showing a deformed state of the cylindrical member and the bottom member when the mold is removed from the bottom member.

FIG. 8A is a schematic sectional view showing another cylindrical container,
(B) is a process drawing showing the manufacturing method of a cylindrical container same as the above.

FIG. 9A is a schematic sectional view showing another cylindrical container,
(B) is a process drawing showing the manufacturing method of a cylindrical container same as the above.

FIG. 10 is a process chart showing a method for producing another cylindrical container.

FIG. 11A is a perspective view showing another cylindrical container, and FIG.
FIG. 2 is an exploded perspective view showing the cylindrical container of the above, and FIG. 2C is a process diagram showing a method of manufacturing the same.

FIGS. 12 (a), (b) and (c) are cross-sectional views showing a tubular member of another tubular container to which the manufacturing method of the present invention can be applied.

FIG. 13 (a) is a perspective view showing an example of a cylindrical container,
(B) is an exploded perspective view which shows the cylindrical container same as the above.

FIG. 14 is a partial cross-sectional view showing the cylindrical container of the above.

FIG. 15 is a process chart showing a conventional manufacturing method for the cylindrical container of the above.

FIGS. 16 (a) and (b) are explanatory diagrams for explaining a problem when the above manufacturing method is adopted.

[Explanation of symbols]

 1, 2, 3 cylindrical container 11 cylindrical member 11a convex portion 11b concave portion 11d ridge 12, 20 bottom member 13 bottom plate 14 peripheral wall 14a concave portion 14b convex portion 14d groove 15 lid member 30 Mold 40, 40a, 40b, 40d Mold 41, 41a, 41b, 41d Shaping recess 42 Non-contact surface 43, 43a, 43b, 43c, 43d Heating bar

Claims (2)

[Claims] 1. A tube in which a thin bottom member formed of a synthetic resin and having an annular peripheral wall connected to a peripheral edge of a bottom plate is fitted to a lower end opening of a thin cylindrical member formed of a synthetic resin. In the method for manufacturing a container, after the bottom member is fitted into the lower end opening of the cylindrical member, the body member and the peripheral wall of the bottom member that are superimposed on each other are partially heated and pressurized. A method for manufacturing a cylindrical container, wherein uneven portions to be fitted to each other are simultaneously formed on both a body member and a peripheral wall of the bottom member. 2. A method for manufacturing a cylindrical container in which a synthetic resin bottom member having an annular peripheral wall connected to the periphery of a bottom plate is fitted to a lower end opening of a thin cylindrical member formed of synthetic resin. In the above, after the bottom member having a concave portion formed on a contact surface of the peripheral member of the bottom member with the cylindrical member is fitted into a lower end opening of the cylindrical member, the bottom member is formed on the peripheral wall of the bottom member of the trunk member. A method for manufacturing a cylindrical container, characterized in that a convex portion that fits into the concave portion formed on the bottom member is formed on the body member by heat-pressing a portion corresponding to the formed concave portion. .