JPH09221152A - Manufacture of container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container having a body formed of a thermoplastic resin, which can be self-supporting even when an opening faces upward or a lid is open, and can ensure relatively large capacity. SOLUTION: At an end part of a container body 12 made of a thermoplastic resin having an opening formed at other end part, a flange 15 whose inner peripheral face is gradually expanded toward one end is formed. The flange 15 is blocked by a sheet-like matter 16, so that a container 11 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container manufacturing method using a container body made of a thermoplastic resin.

[0002]

2. Description of the Related Art In recent years, for example, a container 1 as shown in FIG. 16 has been widely used as a container for cosmetics, foods and the like. This container 1 is closed by sandwiching one end of a container body 2 made of a thermoplastic resin having a cylindrical shape from the left and right sides and fusion-bonded to each other, and at the other end of the container body 2, an opening which can be opened and closed by a lid 3. 4 is provided. This container 1 is more flexible and easier to squeeze out its contents than a container made by molding, the content can be freely set by changing the length of the container body 2, and the container body 2 is easy to manufacture. It has the following features:

[0003]

By the way, in the case of the container 1, since one end of the container main body 2 is narrowed and the opening 4 is formed at the other end to have low self-sustainability, the lid 3 has a large diameter, and The container 1 is formed by laying the container 1 down with the lid 3 closed.
Was self-sustaining. As a result, in the container 1, the lid 3 is increased in size, and the opening 4 faces upward, or
There has been a problem that the container 1 cannot be made to stand by itself in the opened state.

There is also a problem that the capacity of the container body 2 becomes relatively small because one end of the container body 2 is recessed. The present invention has been made in view of the above circumstances, and relates to the manufacture of a container using a container body made of a thermoplastic resin, in particular, it can be self-supporting with the opening facing upward, or even with the lid open, Moreover, the purpose thereof is to easily manufacture a container capable of ensuring a relatively large capacity.

[0005]

In the method of manufacturing a container according to the present invention, at least one end of a container body made of a thermoplastic resin having a cylindrical shape is radially outwardly expanded by a heating press. To form a flange portion, and a bottom member is brought into close contact with the flange portion from one end side to obtain a container having the bottom member as a bottom surface.

Here, the flange portion is installed, for example, so as to be coaxial with the inside of the holder in which the container main body is formed into a cylindrical shape and one end portion of which is provided with a diameter expansion surface for temporarily expanding the diameter toward the one end side. Then, it is formed by sandwiching one end portion of the container main body between the heating core, which is installed on the one end side of the holder so as to be able to be fitted to the diameter expansion surface, and the diameter expansion surface.

Further, for the close contact of the bottom member with the flange portion, for example, a method such as heat fusion or adhesion is used.

Further, as the bottom member, for example, a sheet-like article or a molded product that fits into the flange portion is used. When a sheet-shaped article is used, the sheet-shaped article may be peelable from the flange portion.

On the other hand, when a molded product is used, the molded product can be provided with an openable / closable opening. In particular, when the second opening is provided on the other end side of the container body, it is desirable that the diameter of the second opening be different from the diameter of the opening.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. 1 to 8 illustrate specific steps of the method for manufacturing a container according to the present invention. Reference numeral 12 is a container body, and this container body 12 is a member made of a thermoplastic resin formed into a cylindrical shape by a method such as extrusion molding or blow molding, and at the other end,
Opening part that can be opened and closed by the lid 13 (second opening part)
14 are formed.

Reference numeral 21 is a base, which extends horizontally. The base 21 has a cylindrical shape having a diameter larger than that of the main body 12 of the container, and the entire length of the container main body 12 includes the lid 13. The holder 22 which is set to be slightly shorter than the entire length of is vertically installed. Further, at the upper end of the holder 22, a thick-walled portion 23 whose inner diameter is reduced to be substantially the same as that of the container body 12.
Is formed, and the inner peripheral surface of the thick portion 23 and the upper end (one end) surface of the holder 22 are connected by a diameter-increasing surface 24 having a diameter that is temporarily increased with the inner peripheral surface facing upward. Here, the diameter expansion surface 24 may be expanded upward by a predetermined arc (r), or may be expanded upward by a predetermined angle.

On the other hand, a hole 25 coaxial with the holder 22 is formed in the base 21 so as to pass through the base 21 in the vertical direction, and a projecting pin 26 is vertically movably inserted in the hole 25. There is. The holder 22 is made of metal such as brass.

In manufacturing the container, first, as shown in FIG. 1, the container body 12 is installed with the lid 13 in the holder 22 so as to be coaxial with the other end side facing downward. As a result, one end of the container body 12 slightly projects from the upper end surface of the holder 22. Further, for the purpose of imparting thermoplasticity to the resin forming the container body 12, a heater 31 is inserted from above into the container body 12 as necessary to make the container body 12
Preheat one end of.

Next, a heating core 33, which has a cylindrical shape and a lower end surface of which is a protruding surface 32 which can be fitted to the expanded diameter surface 24, is installed above the holder 22 so as to be coaxial with the holder 22. Then, the heating core 33 is lowered while heating the heating core 33 by the heater 34 provided in the surroundings, and as shown in FIG. The one end of the container body 12 is heated and pressed while sandwiching one end thereof. As a result, one end of the container body 12 is pushed outward in the radial direction according to the shape of the expanded diameter surface 24, and one end of the container body 12 has its inner peripheral surface on one end side, as shown in FIG. Flange part 15 that is temporarily expanded toward
Is formed.

After the flange portion 15 is formed, a cooling core 35 having the same shape as the heating core 33 is installed above the holder 22 so as to be coaxial with the holder 22. Then, the cooling core 35 is lowered, and as shown in FIG.
By sandwiching one end of the container body 12 between the lower end surface (projection surface) 36 of 5 and the expanded diameter surface 24, the flange portion 15 is cooled and the shape of the flange portion 15 is changed to the shape of the expanded diameter surface 24. Accurately follow.

Further, as shown in FIG. 5, a filling nozzle 37 is installed above the container body 12 to fill the contents 51 into the container body 12, and then the flange portion 1 is inserted as shown in FIG.
A heating holder 39 having an annular lower end surface 38 having substantially the same diameter as that of No. 5 is installed above the holder 22 so as to be coaxial with the holder 22. On the other hand, between the lower end surface 38 of the heating holder 39 and the flange portion 15, a sheet-like article (bottom member) 16 such as a film or sheet typified by a laminated film is horizontally interposed.

Then, the heating holder 39 is lowered, and FIG.
As shown in FIG. 5, the lower end surface 38 of the heating holder 39 presses the sheet-like article 16 against the flange portion 15 from above, and the sheet-like article 16 is heated and welded to the flange portion 15 to seal the flange portion 15. As a result, the container body 12 is closed by the sheet-like article 16 from one end side.

After the welding of the sheet-like article 16 is completed, as shown in FIG. 8, the sheet-like article 16 is cut to the outer diameter of the flange portion 15 by using the heating cutter 40, and the ejection pin 26 is moved upward. Move the container body 12
Is projected upward from the holder 22.

As a result, as shown in FIGS. 9 and 10,
The container 11 having a cylindrical shape and having the sheet-like article 16 as the bottom surface is obtained. In addition to the features of the conventional container 1 having the container body 2 made of a thermoplastic resin, the container 11 can stand on its own with the opening 14 facing upward or with the lid 13 open. Since one end of the main body 12 is not narrowed, it has a feature that a relatively large capacity can be secured as compared with the conventional container 1.

Further, the sheet-like article 16 has the flange portion 15
Since it is welded in the state of surface contact with, the welding strength between the flange portion 15 and the sheet-like article 16 is also great. Furthermore, since it is not necessary to newly raise a mold or the like when forming the flange portion 15, the container body 12 can be easily manufactured.

On the other hand, in the above method, the container body 12
Is installed in the holder 22 with the lid 13 in advance and the contents 51 are filled in the container body 12 by the filling nozzle 37, and the flange portion 15 is closed by the sheet-like article 16. After the container body 12 is closed by the sheet-like article 16, the contents 51 are filled with the opening 14
It is also possible to carry out via. In this case, it is not necessary to previously cover the container body 12 with the lid 13 when the container body 12 is installed in the holder 22.

11 to 14 show another example of the container manufactured by the method of the present invention. A container 11a shown in FIG. 11 is obtained by closing the flange portion 15 with a molded product (bottom member) 17 fitted to the flange portion 15 from one end side instead of the sheet-like article 16. FIG.
The container 11b shown in (1) is a molded product 17 provided with an opening 19 that can be opened and closed by a lid 18.

In this case, as shown in FIG. 12, even if the diameter is changed between the opening 14 provided at the other end of the container body 12 and the opening 19 provided in the molded product 17. However, in order to impart self-supporting property to the container 11b, it is desirable that at least one of the lids 13 and 18 has a large diameter.
When the flange portion 15 is closed by the molded product 17, the heating cutter 40 becomes unnecessary.

On the other hand, as shown in FIG. 13, the container body 12
Flange portions 15 are formed on both ends of the sheet, and the flange portion 15 formed on one end side is closed by a sheet-like article 16, and the flange portion 15 formed on the other end side is provided with an opening portion 19 if necessary. It is also possible to close it with the molded part 17 provided.

In FIG. 14, flanges 15 are formed on both ends of the container body 12, and the flanges 15 are closed by a sheet-like article 16. In this case, the sheet-like article 16 that closes the one flange portion 15
However, it may be peelable from the flange portion 15. Further, as shown in FIG.
Further, by providing the tab 16a as shown in FIG. 15, the sheet-like article 16 can be easily peeled off.

For closing the flange portion 15 with the sheet-like article 16 or the molded article 17, well-known methods such as ultrasonic welding and adhesion can be appropriately used in addition to the above-mentioned heat welding.

[0027]

As described above, according to the method of manufacturing a container of the present invention, the content is highly flexible and the contents can be easily squeezed out, and the inner volume can be freely set by changing the length of the container body, and In addition to the features that a container with a container body made of thermoplastic resin has, such as the ease of manufacturing the container body,
Features such as being able to stand by itself with the opening facing upwards or with the lid open, and with a relatively large capacity as compared to conventional containers because one end of the container body is not recessed. A container provided is obtained.

Further, since the sheet-like article is welded in a state of being in surface contact with the flange portion, there is an effect that the welding strength between the flange portion and the sheet-like article is large. Further, since it is not necessary to raise a mold or the like when forming the flange portion, the container body can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a specific process of a method for manufacturing a container according to the present invention.

FIG. 2 is a cross-sectional view illustrating a specific process of the method for manufacturing a container according to the present invention.

FIG. 3 is a cross-sectional view illustrating a specific process of the method for manufacturing a container according to the present invention.

FIG. 4 is a cross-sectional view illustrating a specific process of the method for manufacturing a container according to the present invention.

FIG. 5 is a cross-sectional view illustrating a specific process of the method for manufacturing a container according to the present invention.

FIG. 6 is a cross-sectional view illustrating a specific process of the method for manufacturing a container according to the present invention.

FIG. 7 is a cross-sectional view illustrating a specific step of the method for manufacturing a container according to the present invention.

FIG. 8 is a cross-sectional view illustrating a specific process of the method for manufacturing a container according to the present invention.

FIG. 9 is an upper perspective view showing an example of the shape of a container obtained by the method for manufacturing a container according to the present invention.

FIG. 10 is a partial cross-sectional view showing an example of the structure of a container obtained by the method for manufacturing a container according to the present invention.

FIG. 11 is a partial cross-sectional view showing an example of the structure of a container obtained by the method for manufacturing a container according to the present invention.

FIG. 12 is a vertical cross-sectional view showing an example of the structure of a container obtained by the method for manufacturing a container according to the present invention.

FIG. 13 is a vertical cross-sectional view showing an example of the structure of a container obtained by the method for manufacturing a container according to the present invention.

FIG. 14 is a vertical cross-sectional view showing an example of the structure of a container obtained by the method for manufacturing a container according to the present invention.

FIG. 15 is an upper perspective view showing an example of the shape of a sheet-like article used for the container according to the present invention.

FIG. 16 is an upper perspective view showing an example of the structure of a conventional container.

[Explanation of symbols]

 11, 11a, 11b, 11c, 11d Container 12 Container body 14 Opening (second opening) 15 Flange 16 Sheet-like article (bottom member) 17 Molded product (bottom member) 19 Opening 22 Holder 24 Expanding surface 33 heating core

Claims (9)

[Claims] 1. A thermoplastic resin container body, at least one end of which has a cylindrical shape, is radially outwardly expanded by a heat press to form a flange, and a bottom member is attached to the flange from one end. A method of manufacturing a container, which comprises closely contacting to obtain a container having the bottom member as a bottom surface. 2. The container body is coaxially installed in a holder having a cylindrical shape and a diameter-increasing surface for temporarily enlarging the diameter toward one end side is formed at one end, and the container main body is attached to one end side of the holder. The flange portion is formed by sandwiching one end portion of the container body between a heating core that is installed so as to be able to be fitted to the diameter expansion surface and the diameter expansion surface. Container manufacturing method. 3. The method for manufacturing a container according to claim 1, wherein the bottom member is brought into close contact with the flange portion by fusion bonding. 4. The method for manufacturing a container according to claim 1, wherein the bottom member is brought into close contact with the flange portion by adhesion. 5. The method for producing a container according to claim 3, wherein the bottom member is a sheet-shaped article. 6. The method for producing a container according to claim 5, wherein the sheet-shaped article is peelable from the flange portion. 7. The method for manufacturing a container according to claim 3, wherein the bottom member is a molded product that fits into the flange portion. 8. The method of manufacturing a container according to claim 7, wherein the molded product has an opening that can be opened and closed. 9. The method of manufacturing a container according to claim 8, wherein a second opening having a diameter different from that of the opening is provided on the other end side of the container body.