JPH02238345A - Double seaming apparatus for container - Google Patents

Abstract

PURPOSE:To obtain a container having a metal cap characterized by excellent accuracy by providing a rotary lifter, a rotary chuck and double seaming rolls, attaching a strain gage to the outer surface of a supporting cylinder, and detecting the double seaming force of the double seaming rolls based on the signal from the strain gage. CONSTITUTION:The peripheral edge of a metal cap 22 is loosely coupled to a flange part 21a of a main body 21 of a plastic container wherein contents are put in a container 20 having the metal cap. The container 20 having the metal cap is mounted on a lifter 12. Under the state wherein the container 20 is compressed and held, the lifter 12 and rotary chuck 13 are rotated. Then, a first double seaming roll 14 compresses the peripheral edge part 22a. The roll 14 is rotated, and the first winding and tightening work is performed between the flange part 21a and the peripheral edge part 22a. Then a second double seaming roll 15 performs the second double seaming work. The strain of a supporting cylinder 11 which is generated by the rolls 14 and 15 during the double seaming work is measured with a strain gage 16 and displayed on a strain display meter. The double seaming force for the peripheral edge part 22a of the metal cap 22 can be detected readily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a container tightening device for a container with a metal lid, which is composed of 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 is also called a tin solder can, and has a structure in which the cylindrical body, lid, and bottom are 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.

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

■ Compared to plastic containers, the energy cost of manufacturing them is higher.

■ The press effect of the container exterior cannot be freely changed when the container is made of metal, so the only way to do it is by 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 container tightening devices have been considered for tightening the peripheral edge of a metal lid onto a plastic container body.

That is, this container tightening device includes a rotary lifter supported on a vertically movable support cylinder and on which a container with a metal lid is placed, and a rotary lifter placed above the rotary lifter that presses and holds the container with a metal lid. It includes a chuck and a plurality of tightening rolls arranged outside the rotating chuck and tightening the container with a metal lid.

In such a container tightening device, a metal lid is attached to a plastic container body containing contents, and a container with a metal lid consisting of the container body and the metal lid is connected to a four-turn lifter and a rotary chuck. It is pressed and held between. and,
The four-turn lifter and the rotary chuck rotate while the metal lidded container is pressed and held in this manner. Subsequently, the seaming roll freely rotates while pressing the peripheral edge of the metal lid, and in this way, the peripheral edge of the metal lid is tightened around the flange of the container body.

(Problems to be Solved by the Invention) As mentioned above, when the peripheral edge of the metal lid is wrapped around the flange of the container body, the container with the metal lid is held under pressure between the four-turn lifter and the rotary chatter. A number of seaming rolls are pressed against the peripheral edge of the metal lid, and the peripheral edge of the metal lid is wound around the flange of the container body.

In general, the tightening condition between the peripheral edge and the flange is as follows:
Pressure force of the seaming roll against the peripheral edge of the metal lid (sealing force)
depends on. That is, if the seaming force of the seaming roll is weak, a sufficient seaming state cannot be obtained, while on the other hand, if the seaming force of the seaming roll is too strong, the container body and the metal lid may be deformed.

By the way, there has been no established method for accurately detecting the seaming force of the seaming roller, and the seaming work is currently performed without taking this seaming force into account.

The present invention has been made with these points in mind, and it accurately detects the seaming force of the seaming roll and performs appropriate seaming between the peripheral edge of the metal lid and the flange of the container body. The purpose is to provide a container cinching device that can perform this work.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a rotary lifter supported on a vertically movable support cylinder and on which a container with a metal lid is placed, and a container with a metal lid placed above the rotary lifter. a rotary chuck that presses and holds the metal container with the rotary lifter; and a plurality of seaming rolls that are disposed outside the four-turn chuck and tighten the metal lidded container; This container seaming device is characterized in that a strain meter is attached and the seaming force of the seaming roll is detected by a signal from the strain meter.

(Function) When the seaming roll is brought into contact with the metal lidded container and the seaming work is performed while the metal lidded container is being pressed and held between the rotary lifter and the rotary chuck, the seaming force of the seaming roll is increased. The supporting cylinder is deflected, and this deflection is detected by a strain meter.

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

1 to 5 are diagrams showing one embodiment of the container seaming device according to the present invention.

First, a container with a metal lid that is tightened by the container tightening device of the present invention will be described. As shown in FIG. 1, the container 20 with a metal lid consists of a plastic container body 21 in which contents are stored and a metal lid.

Of these, the container body 21 having the flange portion 21a is constructed by thermoforming a laminate of polypropylene/ethylene vinyl alcohol copolymer/polypropylene, etc.
It may be constructed from a sheet blank made of a laminate and a hot melt resin injected onto the surface of this sheet blank. Further, the metal lid 22 having the peripheral edge portion 22a is made of aluminum or tin.

Next, the container tightening device will be explained. Container seaming device 10
is a vertically movable support cylinder 11 (E), a four-turn lifter 12 supported via a bearing lla on this support cylinder 11 and on which a metal lidded container 20 is placed, and a rotary lifter 1.
Lifter 12 is placed above 2 and rotates the container 20 with a metal lid.
and a rotary chuck 13 that is pressed and held between. Further, a metal lidded container 2 is provided on the outside of the rotary chuck 13.
A first tightening roll 14 and a second tightening roll 15 are provided for tightening the wire. The first seaming roll 14 and the second seaming roll 15 are both movable in the radial direction of the metal lidded container 20. Also, the tightening roll 14
．． 15 rotates freely while pressing the peripheral edge 22a of the metal lid 22, and wraps the peripheral edge 22a of the metal lid 22 around the flange 21a of the container body 21.

Furthermore, a strain gauge 16 is attached to the outer surface of the support cylinder 11 using two attachment jigs 17. This strain meter 16 is
The distortion of the supporting cylinder 11 during the seaming operation is measured and the seaming force by the seaming rolls 14 and 15 is detected. Further, as shown in FIG. 2, a strain indicator 25 is connected to the strain meter 16, and the strain indicator 25 is further connected to a memory high coder (not shown).

FIG. 3 shows the mounting position of the strain gauge 16. The strain gauge 16 is attached to the outer surface of the support cylinder 11, and for example, between the first seaming roll 14 and the second seaming roll 15 (point A),
Near the seaming roll 14 (point B) or the second seaming roll 1
It may be attached to any of the five nearby locations (point C).

Next, the operation of this embodiment having such a configuration will be explained.

First, the container 20 with a metal lid, in which the peripheral edge of the metal lid 22 is loosely fitted into the flange 21H of the plastic container body 21 containing contents (not shown), is placed on the rotary lifter 12 ( Figure 1 (solid line).

Subsequently, the support circle gJll rises to lift up the rotary lifter 12 and the container 2Si20 with a metal lid, and lifts the container 20 with a metal lid.
is pressed and held between the rotary lifter 12 and the rotary chuck 13 (double-dashed line in FIG. 1). Next, the container with metal lid "rI20"
While being pressed and held, the rotary lifter 12 and the rotary chuck 13 rotate, and thereby the metal lidded container W20 also rotates.

Subsequently, the 18th tightening roll 14 moves radially inward,
The first seaming operation (single seaming) is performed between the flange 21a of the container body 21 and the peripheral edge 22a of the metal M22 by freely rotating while pressing the peripheral edge 22a of the metal lid 22.

Subsequently, the first seaming roll 14 moves radially outward and leaves the peripheral edge 22a of the metal lid 22.

Instead, the second seaming roll 15 moves radially inward and the metal! ! It rotates freely while pressing the peripheral edge 22a of the metal M22, and a second @ tightening operation (double seaming) is performed between the flange 21a of the container body 21 and the peripheral edge 22a of the metal M22.

Through such first seaming work and second seaming work,
Sealing of the metal lidded container 20 is completed.

Subsequently, the second seaming roll 15 moves radially outward,
The rotation of the rotary lifter 12 and the rotary chuck 13 is stopped, the rotary lifter 12 is lowered, and the metal lidded container 20 is taken out to the outside of the container seaming device.

During the seaming work, the strain in the support circle n11 caused by the seaming rolls 14.15 is measured by the strain gauge 16.
The value measured by 6 becomes an electric signal and is sent to strain indicator 2.
5 and displayed over time. Further, the values measured by the strain meter 16 are further sent from the strain indicator 25 to the memory high coder and recorded therein.

Next, specific examples of the present invention will be explained.

First, the strain 5116 was attached to point A in FIG. 3, and calibration was performed. That is, No. 1i from the strain meter 16 in the no-load state was read by the strain indicator 25 and recorded by the memory high coder (FIG. 5(b)). Next, as shown in FIG. 4, a support rod that supports a weight 28 of a predetermined weight is placed on the rotary lifter 12, and
A load of 20 kg was applied to the top, and the signal from the strain meter 16 was read by the strain indicator 25 and recorded by the memory high coder (FIG. 5(C)).

Subsequently, as described above, the rotary lifter 12 and the rotary chuck 1 are
3, the metal lidded container 20 is held in a pressed position, and in this state, the metal lidded container 20 is rotated, and the first seaming roll 14 performs a first seaming operation, and the second seaming roll 15 performs a second seaming operation. The seaming work was carried out sequentially.

In this case, the pressing force (sealing force) of the seaming roll 14.15 against the peripheral edge 22a of the metal M22 was read with a strain indicator 25 connected to the strain meter 16 and recorded with a memory high coder (Fig. 5). (a)).

As shown in FIG. 5(a), the seaming force by the first seaming roll 14 is shown in the F slope region of FIG. 5(a), and the seaming force by the second seaming roll 15 is shown in the S region. shown.

As described above, according to this embodiment, the tightening rolls 14, 15 on the peripheral edge 22a of the metal M22 due to the strain d1"16
The seaming force can be easily and accurately detected, and appropriate seaming work can be performed based on this detected value.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to easily and accurately detect the seaming force exerted by the seaming roll using a strain meter, so that appropriate seaming work can be performed based on this detected value. can. Therefore, it is possible to obtain a highly accurate container with a metal lid that does not leak.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the container seaming device according to the present invention, FIG. 2 is a perspective view of the container seaming device, and FIG. 3 is a container seaming device showing the mounting position of the strain gauge. FIG. 4 is a side view of the container tightening device showing a caliper sealant, and FIG. 5 is a diagram showing a state in which signals from a strain meter are recorded by a memory high coder. 10... Container tightening device, 11... Support cylinder, 12...
...Rotary lifter, 13...Rotary chuck, 14...
First seaming roll, 15...Second seaming roll, 16...
- Strain meter, 20... Container with metal lid, 21... Container body, 22... Metal lid.

Claims (1)

[Claims] a rotary lifter supported on a vertically movable support cylinder and on which a container with a metal lid is placed; and a rotary chuck disposed above the rotary lifter to press and hold the container with a metal lid between the rotary lifter and the rotary lifter. and a plurality of seaming rolls disposed outside the rotary chuck and tightening the metal lidded container, a strain gauge is attached to the outer surface of the support cylinder, and a signal from the strain gauge is used to tighten the seaming roll. A container seaming device characterized by being configured to detect the seaming force of a roll.