JPS6013884B2 - Metal can sealing lid adhesive fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for adhering sealing lids of metal cans, and in particular to a sheet-like lidding material made of a strip of original fabric on the opening edge of a metal can at high speed and accurately in a desired lid shape. The present invention relates to an improved fixing device capable of adhesive fixing.

Advantageously, seals made of a layer of hot-melt adhesive on a flexible substrate such as aluminum foil are applied to containers for containing hygroscopic food products to provide a proof-proof (open-proof) seal to the contents. It is widely used as an inner lid, which has the advantages of providing a guarantee that the contents are not sealed, guaranteeing the airtightness of the contents, and being easy to open.

However, it has been difficult to use this conventional seal lid as an inner lid for a metal can for storing seaweed or the like.

That is, in order to tightly fix the aforementioned seal lid to the opening edge of a metal can, it is necessary to heat the hot melt adhesive layer to a temperature higher than its softening point or melting point.
The metal can, which has good thermal conductivity during heating, easily conducts the heat applied to the heat-sealed part, and effectively heats the heat-sealed part locally to dissipate heat to areas other than the heat-sealed part. The problem was that I couldn't do it. Of course, by continuing heat sealing for a relatively long time, it is possible to obtain a reliable adhesive fixation of the seal lid, but in this case, the metal can or the paint or printing ink layer applied to the can There were problems in that scorching and discoloration occurred, and adhesive deterioration occurred due to overheating of the adhesive layer. Conventional heat sealing consists of a method in which an electrically heated heat bar is pressed against the sheet lid to heat the adhesive layer by thermal conduction, but this conventional method has the various drawbacks mentioned above, and is It was difficult to reliably seal Ayabe Sekiguchi.

The present invention has been made in view of the above-mentioned conventional issues, and its purpose is to continuously fix a sheet-like lid material made of a strip-shaped original fabric to a metal can as a sealing lid for a metal can using a high-frequency concessional heating coil. An object of the present invention is to provide a fixing device that can significantly simplify a heat sealing process and a lid cutting process.

In order to achieve the above object, the present invention provides a metal can sealing lid adhesive fixing device for adhesively fixing a sheet-like lid material made of a strip-shaped original fabric and having a heat-sealable resin adhesive layer to the closing twill portion of a metal can. A heating coil that heats the opening edge with high frequency induction in a state where the opening edge of the can and the sheet lid material are not in contact with each other, a holding substrate that holds the sheet lid material in an adhesively fixed position, and a heating coil that is heated by high frequency induction heating. A moving and pressing mechanism that controls the movement of the metal can until its opening twill portion faces the adhesive fixing position and presses the opening green portion against the holding substrate via the sheet-like lid material;
The present invention is characterized in that it includes a cutting mechanism that cuts the sheet-like lid material adhesively fixed to the edge into a predetermined shape.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the main parts of the sealing lid fixing device according to the present invention, in which a sheet-like lid 14 made of a strip-shaped original fabric is cut into a desired lid shape on a metal can 12 that is sent to a lifter 10. It is fixed with adhesive. In the embodiment, the metal can 12 has a curled closing green part 12a, and a sealing lid is adhesively fixed to the closed end part 12a.

The metal can 12 can be formed from a surface-treated steel plate or a light metal plate such as aluminum, and the surface treatment includes electrolytic plating such as chrome plating and tin plating, electroless finishing, galvanizing, hot-dip plating such as hot-dip tin plating, and chromic acid plating. and/or chemical conversion treatment in phosphoric acid, electrolytic treatment, thermal spraying, vacuum adhesion, sputtering lining, painting, etc., to prevent metal corrosion, maintain aesthetic appearance, or harden the surface. Further, as surface-treated steel sheets suitable for the present invention, tinplate, electrolytic chromic acid treated steel sheets (tin-free steel), resin film (e.g. thermoplastic polyester) lamenated steel sheets, etc. are suitable. Further, the metal can 12 can also be formed from a side seam can formed by welding, soldering, adhesive, etc., or a seamless can formed by drawing, ironing, impact processing, etc.
The sheet-like lid material 14 is made of a single or laminated flexible sheet having a heat-sealable tree adhesive layer,
It is preferable to form it from a laminate of a gas barrier substrate and a heat-sealable resin layer.

As the gas barrier base for the lid body 14, metal foil such as aluminum foil or steel foil is suitable, but other materials include ethylene vinyl alcohol copolymer, biaxially oriented polyester film, polyvinylidene chloride film, and polyvinylidene chloride coating. Polyvinyl alcohol films and the like are used alone or in combination with metal foils. In addition, as the heat-sealable resin adhesive layer, a publicly known hot-melt type adhesive is used, and such adhesives include, for example, low-density polyethylene, ethylene-pynylacetate copolymer, etc. Wax-based adhesives made by blending waxes and tackifiers with olefin-based resins and non-wax-based hot melt adhesives are used. As the latter hot melt adhesive, for example, an ethylene vinyl acetate copolymer having a vinyl acetate content of 3 to 3% by weight and 70 to 95% by weight and a vinyl aromatic hydrocarbon polymer or a terbene polymer having a content of 5 to 3% by weight can be used. % by weight of the blend. The adhesive is suitable for a sealed lid that can be easily opened, but when opening by shearing or the like instead of peeling, the hot melt adhesive may be acid-modified olefin resin such as maleic acid-modified polypropylene, Various linear polyamides such as nylon 12, linear thermoplastic polyesters such as polybutylene terephthalate/isophthalate, etc. can be used. The present invention is characterized by a heating coil that performs high-frequency conductive heating of the metal can mouth edge and the sheet-shaped lid in a non-contact state, and a heating coil that heats the metal can's mouth edge with high frequency conductivity in a non-contact state, and the sheet-shaped lid is fixed at an adhesively fixed position. a holding substrate to be held; and a moving and pressing mechanism that controls the movement of the high-frequency induction heated metal can until its opening edge faces the adhesive fixing position and presses the opening edge of the can against the holding substrate via a sheet-like lid; The present invention includes a cutting mechanism that cuts the sheet-like lid material adhesively fixed to the opening twill into a predetermined shape.

In this embodiment, a heating coil 16 that heats the Sekiguchi green part 12a of the metal can 12 in a non-contact state with the sheet-shaped lid 4 is placed in the middle of the movement path of the metal 12 loaded on the lifter 10'. It is provided.

A high frequency power source (not shown) is connected to the heating coil 16, and by supplying a high frequency current from the high frequency power source to the heating coil I6, the open bottom green portion 12a can be rapidly locally heated. The heating coil 16 is housed in a ring-shaped ferrite frame 18, and the metal can 1
2 can be freely inserted inside the ferrite frame 18 as shown in FIG. On the other hand, the sheet-like lid material 14 is held by the holding substrate 20 at a position where the sheet-like lid material 14 is adhesively fixed to the open square twill portion 12a.

That is, the sheet-like lid material 14 has guide rolls 22 and 24.
The heated opening edge 12 is placed on the lower surface of the holding substrate 20, that is, at the position where the adhesive is fixed.
Pressed with a. Note that the holding substrate 20 is fixed to a bracket 26 fixed to the device base (not shown), and as a result, the adhesive fixing position is also fixed. next,
A moving and pressing mechanism that controls the movement of the heated opening edge 12a until it faces the adhesive fixing position and presses the Sekiguchi twill portion 12a against the lower surface of the holding substrate 20 via the sheet-like lid material 14 will be explained using FIG. 3. do.

The moving and pressing mechanism includes a lifter 10, and a shaft 1 of the lifter 10.
A moving device (not shown) is provided below the lifter 0a and moves the lifter 10 in the up and down directions AB. When the lifter 10 is pulled down in the direction B by this moving device, a metal can 12 is placed onto the lifter 10 from a metal can supply device (not shown). The position at which the lifter 10 is pulled down must be accurate in order to position and control the amount of movement of the lifter 10. Therefore, in this embodiment, air cinders 28 and 30 are provided near the lifter 10, and the protrusions 32 and 34 are attached to the lifter 10 as shown by the chain lines.
Accurate positioning of the lowering part of the lifter 10 is performed by protruding toward the position. A cutting mechanism for cutting the sheet-shaped rhombus material 14 adhesively fixed to the entrance edge 12a in a shape along the closing green portion 12a is configured as follows.

In this embodiment, the sheet-like lid material 14 has a die cutter 36,
It is cut by a punch cutter 38. Daikatsuta 36
is the lower diameter plate 4 fixed to the frame 40'
The die cutter 36 is fixed with screws to the die cutter 36, and its upper surface is positioned slightly apart from the lower surface of the holding substrate 20, and the sheet-like lid material 14 is guided between the upper surface of the die cutter 36 and the holding substrate 20. On the other hand, the punch cutter 38
The upper die plate 44 is rotatably supported by a guide post 46 fixed to the lower die plate 42. Therefore, the punch cutter 38 can be moved upwardly by raising the topper die plate 44, and can be brought into engagement with the die cutter 26 by lowering the punch cutter 38 to cut the sheet-like lid material 14. In order to raise and lower the upper plate 44, in this embodiment, a lifting rod 50 is fixed to the upper plate 44 via a support 48, and a lifting device (not shown) is used to raise and lower the upper plate 44. A rod 50 is fixed. Therefore, by raising and lowering the lifting rod 50 using a lifting device (not shown), the upper die plate 44, that is, the punch cutter 38 can be raised and lowered.
In the above description, since the metal can 12 has a circular cross-sectional shape as shown in FIG. 2, the die cutter 36 and the punch cutter 38 each have a cylindrical shape.

A preferred embodiment of the present invention has the above configuration, and its operation will be explained below.

The lifter 10 has been lowered in advance, and at this time, a metal can 12 is delivered onto the lifter 10 from a metal can feeding device (not shown) and sent to war.

When the metal can 12 is placed on the lifter 10, the lifter 10
rises toward the sheet-like lid member 14 in the direction A, and during this upward movement, the Sekiguchi green portion 12a of the metal can 12 is rapidly heated by the heating coil 16 in a non-contact state with the sheet-like lid member 14. And the entrance part 1 of the heated metal can 12
2a further rises and is pressed against the sheet-like lid material 14 at an adhesively fixed position as shown by the solid line in FIG. Then, since the entrance edge 12a is heated, the adhesive layer of the sheet-like lid material 14 that the entrance edge 12a is in contact with melts, and the opening edge 1
2a and the sheet-like cover 14 are securely bonded and fixed. still,
During this adhesive fixation, the punch cutter 38 is retracted upward, and the heat of the open edge 12a is not transmitted to the punch cutter 38, so that no thermal deformation or the like occurs particularly in the punch cutter 38, which has a thin cutting edge width. Furthermore, during induction heating of the entrance edge 12a described above, the die cutter 36 is located away from the heating coil 16, so the die cutter 36 does not reach a high temperature. Next, the sheet-like lid material 14 which is fixed to the entrance edge 12a is cut into a circular shape.

This cutting is performed by lowering the lifting rod using a lifting device (not shown) and lowering the punch cutter 38, and the sheet-like lid material 14 is cut into a circular shape along the entrance edge 12a. Immediately after cutting, the punch cutter 38 retreats upward to prepare for the next cut. After the sheet-like lid 14 is cut as described above, the metal can 12 is pulled down in the direction B by the moving and pressing mechanism and taken out of the apparatus.

Then, the next metal can 12 is fed onto the lifter 10 and stacked thereon, and the above steps are repeated. As explained above, according to the present invention, since the closing green part of the metal can is rapidly heated by the heating coil, it is possible to adhesively fix the sheet-shaped diamond material to the edge of the entrance in an extremely short time.

In addition, by temporarily performing induction heating on the edge of the entrance only while the metal is rising, the heat generated by the heating coil can be reduced.
Since it is not necessary to apply induction heat to the outside of the die cutter or punch cutter, deterioration of the die cutter or punch cutter can be effectively prevented. Therefore, in the present invention, the sheet-like lid material can be glued and fixed to the opening green part of the metal can in a box-like manner and at high speed, and the initial cutting can be carried out, which greatly reduces the time required for these steps. It has the advantage of being able to be digitized.

In addition, by maintaining the holding substrate at an appropriate temperature, the time required for adhesively fixing the sheet-like lid material to the edge of the entrance and the time required for induction heating of the edge of the entrance can be further shortened. Further, the present invention has the advantage that since the metal can simply reciprocates, the various devices for supporting and transporting the metal can can be simplified.

[Brief explanation of the drawing]

1 and 3 are front views of main parts showing preferred embodiments of the sealing lid adhesive fixing device according to the present invention, and FIG. 2 is a plan view taken along the Rolo line in FIG. 1. In each figure, Identical members are given the same reference numerals, 10...lifter, 12...metal can, 12a.
... Sekiguchi Midoribe, 14... Sheet-like lid material, 16... Heating film, 20... Holding board, 36... Die cutter, 38
...Punch cutlet. Figure 1 Figure 2 Mai 3 wings

Claims (1)

[Claims] 1. In a metal can sealing lid adhesive fixing device for adhesively fixing a sheet-like lid material made of a strip-shaped original fabric and having a heat-sealable resin adhesive layer to the opening edge of a metal can, the metal can opening edge and the sheet-like lid material a heating coil that heats the opening edge with high frequency induction in a non-contact state; a holding substrate that holds the sheet-like lid material in an adhesively fixed position; and a metal can heated by high frequency induction, whose opening edge is adhesively fixed. a moving and pressing mechanism that controls the movement until the opening edge faces the holding substrate through the sheet-like lid material; and a cutting mechanism that cuts the sheet-like lid material adhesively fixed to the opening edge into a predetermined shape. A sealing lid adhesive fixing device for metal cans, comprising: