JPH01249233A - Manufacture of container with metal lid - Google Patents

Abstract

PURPOSE:To prevent the deformation of the container main body and to improve the yield of a product by performing seaming with cooling the container main body from the external part in the case of seaming a metal lid on the container main body thermally filled with the content. CONSTITUTION:The seaming part 16 equipped with 1st and 2nd seaming rollers 13, 14 is provided on the upper part of a turret 12 and also a lifter 25 and chuck 27 are arranged for the opening 15 of the turret 12. A cooling pipe 26 is arranged in the lifter 25 to circulate a cooling water. In case of seaming a metal lid 22 by the rolls 13, 14 on the plastic made container main body 21 thermally filled with the content, the seaming is executed with cooling the container main body 21 from the external part by the cooling pipe 26 of the lifter 25. The hardness of the container main body 21 is thus maintained at the specified value, so the deformation of its expansion, etc., is surely prevented. Consequently the generation of a defective product is eliminated and the yield of a product is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for manufacturing a container with a metal lid, which comprises a plastic container body and a metal lid.

(Prior Art) Metal containers, such as metal cans, have various shapes, but can be classified into three-piece cans and two-piece cans based on the structure of the can body. A three-piece can, also known as a tin solder can, has a cylindrical body, lid, and bottom sealed with double seams.

On the other hand, a two-piece can is also called a stamped tin can, and has a structure in which the body and bottom (container body) are integrally molded, and the lid is double-sealed.

These metal cans are used as food packaging containers for various canned foods, juices, soft drinks, jams, dried foods, etc., and are rigid containers with particularly excellent sealing and preservation functions. However, metal cans have the following points to be improved. That is, (1) Since it is a metal can, there is a limit to its weight reduction.

■ If it is crushed by an impact, it will not recover and will be deformed.

(Compared to containers made of less plastic, the energy cost for manufacturing them is higher.

■ If the display effect of the container exterior is made of metal, it cannot be changed freely, and the only means of exterior packaging is printing.

■ It is impossible to create transparent containers that allow the contents to be checked without opening the can.

In order to solve these drawbacks of conventional metal cans,
Containers with metal lids are being considered, which are made by attaching a metal lid to a plastic container body.

Furthermore, when a metal lid is attached to a plastic container body, the peripheral edge of the metal lid is wrapped around the flange portion of the container body.

The following types of metal lids are considered as devices for carrying out the container manufacturing method.

That is, in this manufacturing apparatus, a turret that slides and rotates on a fixed plate is provided with a plurality of openings that can freely communicate with the supply line and the discharge line. This opening is for transporting the container with a metal lid, and a seaming section consisting of a plurality of seaming rollers is provided above the turret so as to surround the container with a metal lid.

Next, a method for manufacturing a container with a metal lid will be explained.

First, the contents (generally mostly liquid) are heat-filled (approximately 40 to 90"C) into the plastic container body. The purpose of heat-filling the contents is to reduce dissolved oxygen in the contents. For acidic foods, this is to sterilize mold and yeast.By reducing dissolved oxygen in this way, the lifespan of the contents can be extended.

Subsequently, a metal lid is loosely fitted onto the container body from above.

A metal lidded container is then fed from the feed line into one of the openings in the turret. Subsequently, the container with a metal lid is transferred as the turret rotates, and when the container with a metal lid comes directly under the seaming part, the turret stops.

Subsequently, a flat plate-like lid rises from below the turret, lifts the container with a metal lid, and presses the container with a metal lid between the chuck and the chuck 9 disposed above. In this pressed state, rotation of the metal lidded container is prevented, and the metal lid is wound onto the container body by the seaming section.

The lifter then descends to return the metal lidded container to the opening in the turret, and the turret resumes rotation.

(Problems to be Solved by the Invention) As described above, in the method for manufacturing a container with a metal lid, seaming by the seaming unit is performed by pressing the container with a metal lid between the upper chuck and the lower glue lid. .

However, when pressing a container with a metal lid with a flat glue lid, the plastic container body becomes soft due to the high temperature contents, and the container body expands outward and deforms the container, making the seaming unstable. There is a problem with becoming.

The present invention has been made in consideration of these points,
An object of the present invention is to provide a method for manufacturing a container with a metal lid, which allows the container with a metal lid to be seamed without deforming the container body.

[Structure of the invention]

(Means for Solving the Problems) The present invention heat-fills the contents into a container body, fits a metal lid into the container body, and vertically moves a container with a metal lid consisting of the container body and the metal lid. A method for manufacturing a container with a metal lid, in which the peripheral edge of the metal lid is wrapped around the flange of the container body while being pressed and held from a direction, the container being The main feature is that the main body is tightened while being cooled from the outside.

(Function) By cooling the container body from the outside when tightening the container, a decrease in hardness of the container body can be prevented (1)-, and deformation of the container body can be prevented.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 are views showing a manufacturing apparatus for carrying out an embodiment of the method for manufacturing a container with a metal lid according to the present invention. The seaming device is not limited to this, and may be a semi-troseamer 10 type seamer or the like.

The manufacturing apparatus 10 is equipped with a turret 12 that slides and rotates on a fixed plate 11 in the upward direction of the arrow in FIG. Six pieces are formed. This opening 15 receives and transfers a metal lid (one container 20) consisting of a plastic container body 21 and a metal lid 22.

Moreover, a pair of 10th-la 13 and a pair of 20th-la 1 are provided above the turret 12 so as to surround the container 20 with a metal lid.
4 are provided, and these rollers 13 and 14 constitute a seaming section 16.

A pair of 10th-la 13 and a pair of 20th-la 14 are
It revolves around the center 16a of the winding part 16 in the two directions shown by the arrows in FIG. 1, and rotates freely.

Also, a pair of 10th-La 1B and a pair of 20th-La 1
4 is a direction (radial direction) toward the center 16a of the seaming portion 16;
It is possible to move freely.

Furthermore, an opening 30 is formed in the fixing plate 11 directly below the seaming portion 16 . On the other hand, the opening 15 of the turret 12 also passes directly under the seaming part 16, and the shapes of the openings 15 and 30 are in the form of a gap. Furthermore, a vertically movable glue lid 25 is inserted into the opening 30 of the fixed plate 11.
is provided. The lid 25 has four portions 25a corresponding to the shape of the bottom surface of the plastic container body 21. The lateral height of the four parts 25a is approximately 90% of the lateral height of the container body 21.

The lifter 25 is normally disposed in the opening 30 and rises when the opening 15 of the turret 12 comes to the position corresponding to the opening 30 of the fixed plate 11, lifts the container 20 with a metal lid, and unwinds the container. The metal capped container 520 is pressed between it and the chuck 27 disposed directly above the clamping part 16.

Further, a cooling pipe 26 is arranged inside the lifter 25.

By passing cooling water through the cooling pipe 26, the container body 21 is housed in the recess 25a of the lifter 25.
can be cooled from the outside. Further, a plurality of springs 28 are provided on the bottom surface of the recess 25a of the lifter 25.
A plate 32 is mounted on this spring 28.

When the spring 28 is released, this plate 32
It comes to the same position as the upper end surface of the lifter 25.

Next, a method for manufacturing a container with a metal lid will be explained.

First, the contents are hot-filled (at about 60° C. or higher) into the plastic container body 21 using a filling device (not shown). Subsequently, the metal lid 22 is loosely fitted into the container body 21 from above.

Subsequently, a container 20 with a metal lid consisting of a plastic container body 21 and a metal lid 22 is supplied from the supply line 17 to the opening 15 of the turret 12.

Subsequently, the metal lidded container 20 is transferred to a position directly below the seaming part 16 by rotation of the turret 12.

In this case, the opening 15 of the turret 12 reaches a position corresponding to the opening 30 of the fixed plate 11, and the metal lidded container 20 is supported by the plate 32 on the spring 28.

Subsequently, as shown in FIG. 2, the rotation of the turret 12 is stopped, and the lifter 25 rises to lift the container 20 with a metal lid, and presses the container 20 with a metal lid from above and below between it and the chuck 27.

In this manner, while the metal lidded container 20 is pressed between the lifter 25 and the chuck 27, the pair of tenth rollers 13 are moved radially inward. and a pair of 10th-la 1
3 is brought into contact with the container 20 with a metal lid, and a first winding process is performed in which the peripheral edge 22a of the metal lid 22 is wrapped around the flange 21a of the container body 21 in a single layer. Subsequently, the pair of 10th rollers 13 are moved radially outward, and the pair of 20th rollers 14 are moved radially inward to perform a second winding process in which double winding is performed.

In this way, a metal lid (1 container 2
0 double seaming is performed. During this tightening operation, the container 20 with a metal lid is held under pressure between the lifter 25 and the chuck 27, so that the container 20 with a metal lid does not rotate, and the tightening operation can be performed reliably.

Further, during the seaming operation, cooling water is continuously passed through the cooling pipe 26 of the lifter 25, and the container body 21 accommodated in the recess 25a of the lifter 25 is cooled from the outside. Therefore, the hot-filled container main body 21 is cooled, and a predetermined hardness can be maintained and a decrease in hardness can be prevented. Therefore,
The container body 21 will not be deformed even if it is pressed during the seaming operation.

Subsequently, the lifter 25 descends to lower the metal lidded container 20 supported by the plate 32 to a position where the bottom surface of the metal lidded container 20 matches the bottom surface of the turret 12.

Thereafter, the rotation of the turret 12 is resumed. Then, the metal lidded container 20 that has been seamed is discharged outward from the discharge line 18, and a product of the metal lidded container 20 that has been seamed in this way is manufactured.

According to this embodiment, the container body 21 is cooled from the outside during the seaming operation, so the container body 21 can maintain a predetermined hardness and will not be deformed by being pressed. do not have. Also, during the seaming work, the container body 21
Since the container body 21 is housed in the recess 25a of the lifter 25, outward expansion of the container body 21 can be more reliably prevented.

〔Effect of the invention〕

As explained above, according to the present invention, by cooling the container body from the outside during seaming, it is possible to prevent the hardness of the container body from decreasing. Therefore, deformation of the container body can be reliably prevented when the container with a metal lid is pressed and tightened, so that the yield of the product can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of an apparatus for carrying out an embodiment of the method for manufacturing a container with a metal lid according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a seaming process. FIG. 10... Container tightening device, 11... Fixing plate, 12...
・Turret, 13...10th-ra, 14...2nd
0-ra, 15... open hole, 16... seaming part, 17...
- Supply line, 18... Discharge line, 20... Container with metal lid, 21... Container body, 22... Metal lid, 2
5... Lifter, 26... Cooling pipe, 27... Chuck, 28... Spring, 30... Hole, 32...
·plate.

Claims (1)

[Claims] The contents are heated into a container body, a metal lid is fitted into the container body, and the flange portion of the container body is pressed and held from above and below. In the method for manufacturing a container with a metal lid, the peripheral edge of the metal lid is wrapped around the flange, and the container body is cooled from the outside when the peripheral edge is tightened around the flange. A method for manufacturing a container with a lid.