JPH07304129A - Perforated film laminated metal panel, bottomed can using the panel, and production of them - Google Patents

Abstract

PURPOSE:To easily obtain a bottomed can having no film on the bottom part thereof by providing a large number of holes to the film laminated to a metal panel and performing press processing using the hole parts as the bottom parts. CONSTITUTION:The film 2 of a perforated film laminated metal panel 1 is positioned on the outside surface of the anode can for a dry battery in order to achieve insulating action and, therefore, a plastic film is used. A large number of circular perforations 2a are opened to the film 2 and the diameter of each of the holes 2a is set to the size almost same to the outer diameter of each of the protruding parts of an anode can. The interval between the holes 2a is set to a predetermined interval so as to be capable of taking out each of blanks 6 centering around each of holes. In lamination, a metal panel 3 and the film 2 having the holes 2a provided thereto are simultaneously passed through the gap between heated laminating rolls 5, 5. By this constitution, the film 2 is thermally fused to the metal panel 3 to obtain the perforated film laminated metal panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforated film-laminated metal plate, a bottomed can using the same, and a method for producing them.

[0002]

2. Description of the Related Art In recent years, a positive electrode can such as an alkaline dry battery is manufactured as a can 61 with a bottom by subjecting a metal plate to a pressing process such as a drawing process or a DI process as shown in FIG. The bottom portion 61a is used as the positive electrode portion.
When a plurality of dry batteries are connected and used, a label 62 is separately attached to the outer surface of the positive electrode can in order to insulate the outer surface of the positive electrode can from the outside.

[0003]

Therefore, since a positive electrode can is manufactured by pressing and then a label is separately attached to the outer surface of the positive electrode can, there is a problem that the manufacturing process is burdened and the manufacturing cost is increased.

Further, when a positive electrode can is manufactured by pressing a metal plate, press oil must be used for lubrication, and therefore, a degreasing process for removing oil after the positive electrode can is manufactured. There is a problem that it is necessary.

Therefore, an object of the present invention is to provide a metal plate laminated with a perforated film, a method for producing the same, a can with a bottom having no film on the bottom, and a method for producing the same. It is another object of the present invention to provide a can for a dry battery and a method for manufacturing the same, thereby solving the above problems.

[0006]

In order to achieve the above object, the perforated film-laminated metal plate of the present invention is provided with a large number of holes in the film laminated on the metal plate.

In this perforated film laminated metal plate, the shape of the holes is preferably circular, the film is preferably a plastic film, and the plastic film is a polyethylene film, polyethylene terephthalate film, polystyrene film, polypropylene film. More preferably, either nylon or polyvinyl chloride film. The metal plate is preferably one of a nickel-plated steel plate, a zinc-plated steel plate, a chrome-plated steel plate, a copper-plated steel plate, a tin-plated steel plate, a nickel-tin alloy-plated steel plate or a tin-free steel.

The bottomed can of the present invention is characterized in that the can is manufactured by pressing using a perforated film laminated metal plate with the hole at the bottom position. In this bottomed can, the shape of the hole having no film at the bottom is preferably circular, and the film is preferably an insulating film. The film is preferably a plastic film, and the plastic is a polyethylene film,
More preferably, it is a polyethylene terephthalate film, polystyrene film, polypropylene film, nylon or polyvinyl chloride film. And the metal plate is nickel plated steel plate, zinc plated steel plate, chrome plated steel plate, copper plated steel plate, tin plated steel plate,
It is preferably either nickel-tin alloy plated steel or tin-free steel.

The bottomed can of the present invention is preferably applied to a can for dry batteries.

Further, the method for producing a perforated film-laminated metal plate of the present invention is characterized in that the above-mentioned multiple holes are preliminarily formed in the film and the film is laminated on the metal plate.

In the method of manufacturing a can with a bottom of the present invention, it is desirable to manufacture the can by pressing using a film-laminated metal plate, with the above-mentioned hole as the bottom position, and the hole has a circular shape. Is preferred. The film is preferably an insulating film, and the film is preferably a plastic film. The film is preferably a polyethylene film, polyethylene terephthalate film, polystyrene film, polypropylene film, nylon or polyvinyl chloride film, and the metal plate is a nickel-plated steel plate, a zinc-plated steel plate, a chrome-plated steel plate, a copper-plated steel plate. , Tin-plated steel sheet, nickel-tin alloy-plated steel sheet, or tin-free steel is more preferable.

The method for producing a bottomed can of the present invention is preferably applied to a can for dry batteries.

[0013]

In the film-laminated metal plate of the present invention having a hole in the film, the blank is cut out by positioning so that the hole of the film is the bottom, and using this blank, the hole of the film is the bottom. The bottomed can is manufactured by press working positioned so that. This gives a can with no film at the bottom.

[0014]

EXAMPLES Examples of a method for producing a positive electrode can of an alkaline dry battery using a perforated film laminated metal plate are shown in FIGS.
This will be described in detail with reference to FIG.

In FIG. 1, since the film 2 of the perforated film-laminated metal plate 1 of the present invention is required to be located on the outer surface of the positive electrode can and perform an insulating function, an insulating film is used as the film. ing. For example, a plastic film can be used, more preferably a polyethylene film, a polyethylene terephthalate film,
Polystyrene film, polypropylene film, nylon or polyvinyl chloride film can be used.

As the plastic film, it is usually desirable to use an oriented thermoplastic resin, and one having a high degree of crystal orientation during can making is desirable. Therefore, it is preferable to use a film that has been stretched and oriented in two longitudinal and lateral directions after the film has been formed, rather than the film as it is formed by an extruder. When the thickness of the film in the can manufacturing is in the range of 5 to 50 μm, the film can have sufficient heat resistance, strength and insulating properties. From the strength during can making, the preferable lower limit is 8 μm and the upper limit is 30 μm. The plastic film is capable of molecular orientation, and it is desirable to maintain an appropriate degree of orientation during heat treatment, drawing, redrawing, ironing and the like. The material of the plastic film used in the present invention includes, for example, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-acrylic ester copolymer,
Olefin-based resin film such as ionomer; polyethylene terephthalate, polybutylene terephthalate,
Polyester films such as ethylene terephthalate / isophthalate copolymer, ethylene terephthalate / adipate copolymer, ethylene terephthalate / sepacate copolymer, butylene terephthalate / isophthalate copolymer; nylon 6, nylon 6.6, nylon 11,
Polyamide film such as nylon 12; polyvinyl chloride film; polyvinylidene chloride film; poly-P-xylene glycol biscarbonate, poly-dioxydiphenylethane carbonate, poly-dioxydiphenyl 2,2-propanecarbonate, poly-dioxy Polycarbonate film such as diphenyl 1,1-ethane carbonate; acrylonitrile with high nitrile content-
It is possible to use a high nitrile resin such as a butadiene copolymer or an acrylonitrile-styrene copolymer: polystyrene copolymer that satisfies the above conditions.

In the present invention, all of the above plastics can be used, but among them, it is desirable to use a film made of polyester having ethylene terephthalate units as a main component and having a biaxial molecular orientation. As the polyester resin, 75 to 95% of the ester repeating units are composed of ethylene terephthalate units, and the remaining 5 to 25%.
It is preferred that% of the ester repeating units consist of ester units other than ethylene terephthalate units. As the acid component other than terephthalic acid, one or two of phthalic acid, isophthalic acid, succinic acid, azelaic acid, adipic acid, sebacic acid, dodecanedioic acid, diphenylcarboxylic acid, 1,4 cyclohexanedicarboxylic acid, and trimetic anhydride are used. More than one kind of acid component can be mentioned, and as the alcohol component other than ethylene glycol, 1,4 butanediol,
One of 1,5 pentanedione diol, 1,6 hexanediol, propylene glycol, polytetramethylene glycol, trimethylene glycol, triethylene glycol, neopentyl glycol, 1,4 cyclohexanedimethanol, trimethylolpropane, pentaerythritol or 2 or more types of saturated polyhydric alcohols are mentioned. The ester unit other than the ethylene terephthalate unit may be any one or both of the acid component and the alcohol component as long as it is an acid component other than terephthalic acid and a polyhydric alcohol other than ethylene glycol. It can be used to obtain a copolyester. Such a copolyester resin can also be obtained by a method of blending a polyester comprising a copolymer component with an ethylene terephthalate resin, melting it, and copolymerizing it by a partition reaction.
Furthermore, the intrinsic viscosity, that is, the IV value is 0.50 to 0.70.
By using the polyester resin film described in (1) above, a polyester resin-coated metal plate having excellent denting resistance in the can body of a thin-walled deep-drawn can, which is the main object of the present invention, can be obtained. In some cases, the addition of additives such as stabilizers, antioxidants, antistatic agents, pigments, lubricants, corrosion inhibitors, etc. will not hinder the present invention, if necessary.

The thickness of the polyester resin film used in the present invention is not particularly limited,
It is preferably 5 to 50 μm. When the thickness is 5 μm or less,
Laminating workability is significantly reduced, and sufficient processing corrosion resistance cannot be obtained. Further, when the thickness is 50 μm or more, it is not economical as compared with the epoxy resin paint widely used as a material for a can. When an adhesive is interposed between the metal plate of the laminate plate and the plastic film, a coating material having excellent adhesion to the metal plate and corrosion resistance, and also excellent adhesion to the film is used. As this adhesive, a curing agent resin for epoxy resin and epoxy resin, for example, a coating composed of a combination of a phenol resin, an amino resin, an acrylic resin, a vinyl resin, a urea resin and the like, particularly an epoxy-phenol coating,
Organosol-based paints comprising a composition of vinyl chloride resin, vinyl chloride copolymer resin and epoxy resin-based paint are used. The thickness of the adhesive layer is 0.1-5 μ
A range of m is desirable. A thickness that does not hinder the crystal orientation of the crystalline thermoplastic resin is appropriately selected and used.

A large number of circular holes 2a are formed in the film 2. The diameter of the hole 2a is about the outer diameter of the protruding protrusion (8 in FIG. 4) of the positive electrode can. Also the hole 2a
The holes 2a and the holes 2a need to have predetermined intervals so that the blank 6 described later can be taken out around the holes (see FIG. 1B).

The thickness of the metal plate 3 varies depending on the kind of metal, the use or size of the can, but is generally 0.10 to 10.
It is preferable that the surface-treated steel sheet has a thickness of 0.80 mm.
It should have a thickness of 5 to 0.60 mm. As the metal plate, various surface-treated steel plates and light metals such as aluminum are used. As the surface-treated steel sheet, a cold-rolled steel sheet is annealed and then secondary cold-rolled, and one or two of surface treatments such as zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment (tin-free steel), and chromic acid treatment. It is possible to use those obtained by performing more than one kind. An example of a suitable surface-treated steel sheet is
Electrolytic Chromic Acid Treated Steel Sheet (Tin Free Steel, TF
Is S), in particular those with an upper layer of hydrated chromium oxide of 10 to 200 mg / m lower ^second metal chromium and 1 to 50 mg / m ² (reckoned as metal chromium). When the resin film is polyester, 3 to 50 mg / m ^{2 and} particularly 7 to 25 mg / m ² are preferable. This product has an excellent combination of coating film adhesion and corrosion resistance. Another example of the surface-treated steel plate is a tin plate having a tin plating amount of 0.5 to 11.2 g / m ² . It is desirable that this tin plate be treated with chromic acid or chromic acid / phosphoric acid so that the amount of chromium becomes 1 to 30 mg / m ^{2 in} terms of metal chromium. As another example of the surface-treated steel sheet, a nickel steel sheet having a plating amount of 5 to 50 g / m ² is preferably used from the viewpoint of corrosion resistance. When the bottomed can is used as the positive electrode can of a dry battery, the positive electrode active material and the like come into contact with the inside, so taking into account conduction, corrosion, etc., nickel-plated steel sheet, zinc-plated steel sheet, chrome-plated steel sheet, copper-plated steel sheet. It is preferable to use tin-plated steel sheet, nickel-tin alloy-plated steel sheet, tin-free steel, or the like.

Next, a method of manufacturing the perforated film laminated metal plate 1 will be described.

First, a large number of holes 2a are preliminarily formed on the film. Punching, for example, by a means such as passing the film between a roll having a large number of cylindrical convex portions on the outer peripheral surface and a roll having a large number of concave portions fitted on the cylindrical convex portion on the outer peripheral surface, It can be easily performed (not shown).

Then, the film having a large number of holes is laminated on a metal plate by a usual laminating method. That is, for example, as shown in FIG. 1, the metal plate 3 and the film 2 having the holes 2a are simultaneously passed between heated laminating rolls 5-5. Thereby, the film 2 is heat-sealed to the metal plate, and the perforated film-laminated metal plate 1 is obtained. In this way, the perforated film-laminated metal plate 1 can be easily obtained by forming the holes 2a in the film before laminating and laminating the holes on the metal plate.

In laminating, an adhesive layer may be provided on one or both of a metal plate and a film, and after drying or partial curing, both may be pressure-bonded and integrated under heating. Providing the above-mentioned adhesive layer is not always essential in the present invention. It relaxes the biaxial crystallographic orientation of certain parts of the plastic film during the laminating process, but drawing and redrawing makes no difference.

When a plastic film is provided on both sides, a film for the outer surface of the can is used as a filler (pigment) for the purpose of concealing the metal plate and assisting the conduction of the wrinkle holding force to the metal plate during draw-redraw forming. Can be included. As the inorganic filler, rutile type or anatase type titanium dioxide, zinc white, inorganic white pigment such as gloss white; perlite, precipitable sulfate perlite, calcium carbonate, gypsum, precipitable silica, aerosil, talc,
White extenders such as calcined or unfired clay, barium carbonate, alumina white, synthetic or natural mica, synthetic calcium silicate, magnesium carbonate; white extenders such as carbon black and magnetite; black pigments such as carbon black and magnetite; Red pigments such as red iron oxide; yellow pigments such as Siena; and blue pigments such as ultramarine blue and cobalt blue. These inorganic fillers are contained in an amount of 10 to 500% by weight, especially 10 to 3% by weight of the resin.
It can be compounded in an amount of 00% by weight.

The surface temperature of the heating roll varies depending on the material and thickness of the plastic film. For example, in the case of a polyethylene terephthalate film, a temperature of 210 to 260 ° C. in the high temperature part and a temperature of 170 to 230 ° C. in the region Z are used. Laminating speed is about 200 m / min.
The degree may be the same as in the conventional laminating method. As a heating roll as a heating means for heating the metal plate 3,
Induction heating rolls, heat pipe rolls, jacketed rolls, etc. may also be used.

Next, a case where a bottomed can is manufactured using the perforated film-laminated metal plate 1 obtained by the above manufacturing method will be described. The bottomed can can be applied to, for example, a can for dry batteries.

First, a punching press jig 7 having a predetermined diameter for taking out the blank 6 is positioned on the film laminated metal plate 1 with each hole 2a as a center and then pressed (FIG. 2 (a)). )). Thereby, each blank 6 is cut out, and the shape of the blank 6 is as shown in FIG.
As shown in (a) and (b), the circle of the film hole portion 2a and the outer circumference circle of the blank 6 are concentric circles. Further, by preparing a jig having both a die and a punch for the punching press jig 7, the blank 6 is cut out and immediately drawn, and then a light drawn bottomed can as shown in FIG. 3C is obtained. Can also be

Then, the blank 6 is concentrically aligned with the die having the film 2 side, and the concentric blank 6 is concentrically arranged in the die having the circular cross section between the punch and die having the circular cross section. Then, it is sandwiched and pressed (not shown) to obtain a can 16 with a bottom having an insulator made of a film, which is symmetrical with respect to the central axis of FIG. This can with a bottom is suitable when applied as a positive electrode can of an alkaline dry battery.

By using the perforated film-laminated metal plate 1 as described above, the side wall of the bottomed can (around the can)
Since there is no need to label the insulation separately,
There is an advantage that the manufacturing process for manufacturing the positive electrode can of the alkaline dry battery is extremely shortened.

Next, since the concentric blank 6 is concentrically aligned and pressed in a die having a circular cross section, during pressing, the film 2 on the blank 6 is not concentrically aligned. The same amount of radial outward force is produced. Therefore, a large force is generated in a part of the edge portion of the hole 2a of the film 2, so that there is no possibility that a defect such as a film breakage from the part occurs.

In pressing, since the film 2 is adhered to the blank 6 surface on the die side, press oil is almost unnecessary at least on this side, and therefore press oil should be used in the pressing step. It can be unused or halved. Further, it is possible to omit or largely simplify the degreasing step after pressing, and further it is possible to shorten the manufacturing step of the positive electrode can such as the alkaline dry battery.

In the perforated film laminated metal plate of the present invention, since the film and the metal plate are in close contact with each other, the thickness of the laminated metal plate is the same as that of a conventional positive electrode for a dry battery by pressing the metal plate. Compared to the total thickness of the metal plate and the label when the can is manufactured and the label is attached to the outer surface with an adhesive or the like, the thickness can be significantly reduced. It is possible to increase the inner diameter of the can and increase the battery capacity.

Although the positive electrode cans for alkaline dry batteries have been described in the above embodiments, various cans for dry batteries can be manufactured using a perforated film laminated metal plate. For example, it is possible to manufacture a negative electrode can for a specific type of dry battery. Further, the present invention is not limited to the outermost can (exterior can) as in the above-mentioned embodiment, but can be used for manufacturing a can for a dry battery having an inner can positioned inside the dry battery and a heat-shrinkable tube adhered to the outer surface thereof. The invention can be used.

Furthermore, without being limited to these, the perforated film-laminated metal sheet of the present invention can be used for manufacturing various cans having a bottom without a film. For example, it can be applied to the production of a bottom can of soft drink having a film only on the outer side surface and no film on the bottom. The type of the film, the type of the metal plate, the shape of the holes, etc. are selected according to the type of the bottomed can having no film at the bottom manufactured using the perforated film-laminated metal plate of the present invention.

[0036]

The perforated film-laminated metal sheet of the present invention is press-processed with the perforations at the bottom to produce a bottomed can, so that a bottomed can having no film at the bottom can be easily obtained. You can

A perforated film-laminated metal plate can be easily obtained by previously forming a hole in the film and laminating the film on a metal plate.

By manufacturing a can for a dry battery using the perforated film-laminated metal plate of the present invention, a can for a dry battery whose periphery is covered with an insulator can be manufactured in a single step.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing a state of producing a perforated film laminated metal sheet of the present invention, and FIG. 1 (b) is a position of a blank cut out from the perforated film laminated metal sheet of the present invention. It is a perspective explanatory view showing.

FIG. 2 is a side view showing how a blank is cut out.

3A is a plan view of a blank, FIG. 3B is a sectional view of FIG. 3A, and FIG. 3C is a sectional view of a can formed by drawing at the same time as blanking. Is.

4 is a cross-sectional view of a positive electrode can of an alkaline dry battery manufactured using the blank of FIG.

FIG. 5 is a perspective view showing a positive electrode can and a label of a conventional alkaline dry battery.

[Explanation of symbols]

 1 Perforated Film Laminated Metal Plate 2 Film 2a Hole 3 Metal Plate 16 Can for Dry Battery

Claims (20)

[Claims] 1. A perforated film-laminated metal plate, wherein a film laminated on the metal plate is provided with a large number of holes. 2. The perforated film-laminated metal plate according to claim 1, wherein the shape of the holes is circular. 3. The perforated film-laminated metal plate according to claim 1, wherein the film is a plastic film. 4. The perforated film-laminated metal plate according to claim 3, wherein the plastic film is any one of a polyethylene film, a polyethylene terephthalate film, a polystyrene film, a polypropylene film, a nylon film and a polyvinyl chloride film. . 5. The metal plate is any one of a nickel-plated steel plate, a zinc-plated steel plate, a chrome-plated steel plate, a copper-plated steel plate, a tin-plated steel plate, a nickel-tin alloy-plated steel plate, or a tin-free steel. 1 to
4. A perforated film-laminated metal plate according to any one of 4 above. 6. A bottomed can having no film at the bottom, characterized in that the can is manufactured by pressing the film-laminated metal plate according to claim 1 by pressing the hole at the bottom. 7. The can with a bottom according to claim 6, wherein the shape of the hole having no film on the bottom is circular. 8. The bottomed can according to claim 6, wherein the film is an insulating film. 9. The can with a bottom according to claim 6, wherein the film is a plastic film. 10. The can with a bottom according to claim 9, wherein the plastic is any one of a polyethylene film, a polyethylene terephthalate film, a polystyrene film, a polypropylene film, a nylon film, and a polyvinyl chloride film. 11. The bottom according to claim 6, wherein the metal plate is any one of a nickel-plated steel plate, a zinc-plated steel plate, a chrome-plated steel plate, a copper-plated steel plate, a tin-plated steel plate, a nickel-tin alloy-plated steel plate, or a tin-free steel. With can. 12. The can with a bottom according to claim 6, wherein the can with a bottom is a can for a dry battery. 13. The method for producing a perforated film-laminated metal plate according to claim 1, wherein the plurality of holes are preliminarily formed in the film, and the film is laminated on a metal plate. 14. A method for producing a can with a bottom without a film at the bottom, which comprises using the film-laminated metal plate according to claim 1 to press the can with the hole at the bottom. 15. The method of manufacturing a can with a bottom according to claim 14, wherein the shape of the hole is circular. 16. The method of manufacturing a can with a bottom according to claim 14, wherein the film is an insulating film. 17. The method of manufacturing a can with a bottom according to claim 4, wherein the film is a plastic film. 18. The method for producing a can with a bottom according to claim 17, wherein the film is any one of a polyethylene film, a polyethylene terephthalate film, a polystyrene film, a polypropylene film, a nylon film and a polyvinyl chloride film. 19. The metal plate is any one of a nickel-plated steel plate, a zinc-plated steel plate, a chrome-plated steel plate, a copper-plated steel plate, a tin-plated steel plate, a nickel-tin alloy-plated steel plate, or a tin-free steel. 1
4. The method for manufacturing a bottomed can according to item 4. 20. The method for producing a bottomed can according to claim 14, wherein the bottomed can is a dry battery can.