WO2023079935A1 - シームレス缶の製造装置及び製造方法 - Google Patents

シームレス缶の製造装置及び製造方法 Download PDF

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Publication number
WO2023079935A1
WO2023079935A1 PCT/JP2022/038537 JP2022038537W WO2023079935A1 WO 2023079935 A1 WO2023079935 A1 WO 2023079935A1 JP 2022038537 W JP2022038537 W JP 2022038537W WO 2023079935 A1 WO2023079935 A1 WO 2023079935A1
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Prior art keywords
heating
seamless
drawn
neck
ironed
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Ceased
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PCT/JP2022/038537
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English (en)
French (fr)
Japanese (ja)
Inventor
英紀 石黒
真之 中村
洸治 脇坂
清太郎 金澤
翔太 内野
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Toyo Seikan Co Ltd
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Toyo Seikan Co Ltd
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Priority to JP2023557924A priority Critical patent/JPWO2023079935A1/ja
Publication of WO2023079935A1 publication Critical patent/WO2023079935A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material

Definitions

  • the present invention relates to a seamless can manufacturing apparatus and manufacturing method, and more particularly, to a resin-coated seamless can manufacturing apparatus having a neck/flange processing means, in which the resin coating of the neck/flange processed portion of the seamless can.
  • the present invention relates to a seamless can manufacturing apparatus equipped with partial heating means for preventing peeling, and a seamless can manufacturing method using this manufacturing apparatus.
  • Seamless cans produced by molding such as drawing, drawing/re-drawing, drawing/ironing, and thinning drawing/ironing using a resin-coated metal plate obtained by coating a metal plate with resin such as polyester resin. is widely used.
  • Seamless cans used for beverages and foods are subjected to retort sterilization after being filled with contents. Since such retort sterilization treatment is performed under high-temperature and high-humidity conditions, there is a problem called retort brushing (white spots), in which water droplets adhere to the bottom of a can crystallize and whiten.
  • retort brushing white spots
  • it has been proposed to use a copolyester containing polybutylene terephthalate (PBT) as the resin coating Patent Documents 1 and 2, etc.
  • a polyester resin with a large PBT content in order to prevent whitening of the outer surface resin coating such as retort brushing and white streaks. Since a large amount of resin coating has high crystallinity, oriented crystals are generated in the can axis direction, which is the rolling direction of the resin-coated metal sheet in the can manufacturing process, and the adhesion to the metal sheet tends to decrease. Moreover, when the PBT compounding amount increases, the PET resin compounding amount becomes relatively small, and in particular, the compounding amount of the PET resin having a high isophthalic acid content decreases, which tends to reduce the adhesion to the metal plate. be.
  • wrinkle impressions are likely to occur on the neck portion that is subjected to seaming processing, etc., so if exposed to high temperature and high humidity conditions such as retort sterilization treatment, this wrinkle impression will occur. It is thought that the penetration of water vapor causes peeling of the resin coating with poor adhesion (sometimes referred to as "neck delamination"). In addition, in the entire can of a seamless can, the neck portion is a region where the compressive strain of the resin coating in the can circumferential direction increases due to drawing and ironing during the can manufacturing process, and the adhesion between the resin coating and the metal plate is weak. It is thought that there is a trend.
  • the top of the can body may be seamed, and the neck may be damaged in the same way as the outer resin-coated seamless can due to handling or the inclusion of foreign matter.
  • a sterilization treatment such as retort sterilization or a steaming treatment is performed in a state in which such a flaw is formed, the inner surface resin coating is affected by the internal pressure and the contents, and the inner surface resin coating is peeled off in the same manner as the outer surface resin coating. (sometimes referred to as "flaw delamination") may occur.
  • the neck portion tends to have weaker adhesion between the resin coating and the metal plate than other regions in the entire can also applies to the inner surface resin coating.
  • a heating process is performed in which the entire can body after ironing is heated under high temperature conditions for the purpose of removing the lubricant and relaxing the forming strain.
  • an object of the present invention is to provide a seamless can manufacturing apparatus equipped with a partial heating means capable of suppressing the generation of flaws in the neck portion of a resin-coated seamless can and the peeling of the resin coating, and to manufacture a seamless can using such a manufacturing apparatus. It is to provide a manufacturing method.
  • a drawing means for forming a shallow-drawn can by drawing using a resin-coated metal sheet having a resin coating formed on the inner surface and/or the outer surface thereof, and drawing the shallow-drawn can by redrawing and ironing.
  • Re-drawing and ironing forming means for forming a drawn and ironed can, heating means for heating the entire drawn and ironed can, printing means for printing on the outer surface of the body of the drawn and ironed can heated by the heating means, and printing by the printing means.
  • a seamless can manufacturing apparatus comprising drying and baking means for heating the drawn and ironed can, and neck/flange processing means for necking and flanging the dried and baked drawn and ironed can, wherein the drawing means and Between the re-drawing and ironing means, between the heating means for heating the entire drawn and ironed can and the printing means, or after the neck/flange processing means, it becomes a neck portion when a seamless can is made.
  • a seamless can manufacturing apparatus comprising partial heating means for partially heating a portion of the can body and partial heating and conveying means for conveying the can body during the partial heating.
  • the partial heating conveying means conveys with a turret; 2.
  • the partial heating and conveying means includes a rotation mechanism that rotates the can body during partial heating; 3.
  • the rotation mechanism is a mechanism that attracts and holds the bottom of the can body to rotate the can body, 4.
  • said partial heating means being arranged after the neck flanging means; 5.
  • the neck flanging means and the partial heating means are connected by a turret; 6.
  • the heating in the partial heating means is high frequency induction heating, 7.
  • the heating time by the high-frequency induction heating is less than 2 seconds, 8.
  • the resin of the resin coating is a polyester resin, and the partial heating means heats a portion that will become a neck portion when a seamless can is made to a temperature of 185 to 230 ° C.; is preferred.
  • a draw forming step of forming a shallow-drawn can by drawing using a resin-coated metal sheet having a resin coating formed on the inner surface and/or the outer surface, and redrawing and ironing the shallow-drawn can.
  • a seamless can manufacturing method comprising a drying/baking step of heating the entire drawn and ironed can, and a neck/flanging step of necking/flanging the dried/baked drawn and ironed can, wherein the drawn Between the forming step and the re-drawing and ironing forming step, between the heating step of heating the entire drawn and ironed can and the printing step, or after the neck/flange processing step, the neck when a seamless can is formed.
  • a method for producing a seamless can comprising: a partial heating step of partially heating a portion to be a portion; and in the partial heating step, partially heating the portion to be the neck portion while conveying the can body. provided.
  • the seamless can manufacturing method of the present invention 1. Carrying out the transportation of the can body in the partial heating step by a transportation turret; 2.
  • the conveying turret has a rotation mechanism for rotating the can body during partial heating, and performing partial heating while rotating the can body; 3. the partial heating step is performed after the neck flanging step; 4.
  • the resin of the resin coating is made of a polyester resin, and in the partial heating step, heating is performed so that the neck portion when made into a seamless can has a temperature of 185 to 230 ° C.; 5.
  • the heating in the partial heating step is high-frequency induction heating; 6.
  • the heating time by the high-frequency induction heating is less than 2 seconds, is preferred.
  • the seamless can manufacturing apparatus of the present invention it is possible to heat the portion that will become the neck portion of the seamless can at the above-described specific timing. can be controlled, the adhesion of the resin coating to the metal plate can be improved, and a seamless can can be manufactured in which peeling of the resin coating is effectively suppressed. Further, by conveying the drawn and ironed can (can body) formed through the drawing means and the redrawing and ironing means with a turret during partial heating, the can body can be conveyed at high speed and the processing speed of partial heating is improved. can do Furthermore, by using a turret equipped with a mechanism for rotating the can body, the entire circumference of the neck portion can be partially heated uniformly.
  • the rotation mechanism holds and fixes the can body at the bottom of the can body, together with the above-described turret transportation, it is possible to reduce the influence of the contact of jigs, etc. with the outer surface (body portion) of the can body. It is possible to produce a can body excellent in appearance characteristics with good productivity. Furthermore, by performing partial heating of the neck portion by high-frequency induction heating, only the neck portion can be heated in a short period of time so as to obtain the desired oriented crystals, which is excellent in productivity.
  • the seamless can manufactured by the manufacturing apparatus of the present invention has remarkably excellent adhesion of the resin coating to the metal plate, particularly the adhesion of the resin coating to the metal plate at the neck portion. Therefore, even when exposed to high temperature and high humidity conditions after filling the contents, whitening such as retort brushing of the outer resin coating and whitening such as white streaks are prevented. Peeling of the coating is also effectively prevented, and the adhesion to hot water is excellent.
  • FIG. 2 is a flow diagram showing an example of arrangement of each means in the seamless can manufacturing apparatus of the present invention.
  • FIG. 1 is a schematic diagram for explaining an example of a seamless can manufacturing apparatus of the present invention; It is a figure for demonstrating a partial heating means.
  • 4 is a diagram for explaining the arrangement of high-frequency induction heating coils of the partial heating means in FIG. 3; FIG.
  • the seamless can manufacturing apparatus of the present invention includes a drawing means for forming a shallow-drawn can by drawing, and a redraw-ironing forming for forming a drawn and ironed can by redrawing and ironing the shallow-drawn can.
  • a conveying means such as a conveyor or a turret is provided for sequentially conveying the can body discharged from the redrawing and ironing means to each means.
  • the partial heating means for partially heating the neck portion of the seamless can is provided between the drawing means and the redraw ironing means (HT1 in FIG. 1). It is important that it be placed either between the heating means for heating the entire drawn and ironed can and the printing means (HT2 in FIG. 1), or after the neck flanging means (HT3 in FIG. 1). It is a feature.
  • FIG. 2 is a simplified diagram showing an example of a manufacturing apparatus in which a turret is used as a conveying means, and the previous process and the next process are connected by the conveying turret.
  • a can body (drawn and ironed can) 10 carried out from the drawing means and the redrawing and ironing means (both means are collectively indicated by 1) is supplied to the heating means 2 from the conveyor C1.
  • the can body 10 heated by the heating means 2, from which the lubricant has been removed, and from which the forming distortion has been removed, is supplied by the conveyor C2.
  • the can body 10 on which the printed layer and the finishing varnish layer are formed is supplied to the drying/baking means 4 by the conveyor C3.
  • the can body 10 with the printed layer and the finishing varnish layer baked on the can body by the drying/baking means 4 is transferred from the conveyor C4 to the conveying turret T1 and supplied to the necking turret T2.
  • the conveying turret T1 and supplied to the necking turret T2.
  • a plurality of necking turrets are arranged according to the number of necking processes.
  • the can body 10 having the neck portion formed thereon is carried out from the necking turret T2 by the carrying turret T3 and supplied to the flanging turret T4.
  • the can body 10 having the flange portion formed thereon is carried out from the flanging turret T4 by the carrying turret T5 and supplied to the partial heating process turret T6.
  • the can body (seamless can) 10 whose neck portion has been partially heated is carried out from the partial heating process turret T6 by the carry-out turret T7, and carried out from the manufacturing apparatus via the conveyor C5.
  • the material is conveyed from the heating means to the partial heating means by a conveyor or a turret, but the present invention is not limited to this and can be changed as appropriate.
  • a drawn and ironed can can be formed as follows. That is, although not limited to this, after the resin-coated metal plate is drawn into a cup-shaped shallow-drawn can, it is mounted on a blank holder of a forming apparatus, and the ironing punch is moved to press against the redraw die. , redraw and form into a deeper cup. Subsequently, the forming punch moves and passes through multiple dies to perform ironing, thereby obtaining a drawn and ironed can (hereinafter sometimes simply referred to as "can body").
  • the shallow-drawn cans are then subjected to redrawing and ironing means.
  • Partial heating means for partially heating a part may be arranged (HT1 in FIG. 1). In this partial heating means HT1, it is preferable to partially heat a position of 0 to 25% from the top of the can body with respect to the can height of the shallowly drawn can (the partial heating means will be described later).
  • the redrawing and ironing means the redrawing can be omitted depending on the drawing ratio of the shallowly drawn can, and the ironing may be performed directly. Further, a bending and stretching process (stretching process) by redrawing may be performed.
  • the side walls are thinned by redrawing and ironing. The thickness is preferably reduced to 30 to 65%, particularly 34 to 42%, of the raw thickness of the resin-coated metal sheet.
  • Heating means After the can body obtained by drawing and redrawing and ironing is trimmed at the top of the can body by a trimming means (not shown), it is supplied to a heating means to remove the lubricant used at the time of forming, and A heat treatment is applied to relax the molding distortion of the resin coating.
  • the heating means is not limited to this, but conventionally known heating means such as a hot air circulation furnace, an infrared heating furnace, a high frequency induction heating device, and a dielectric heating device can be used.
  • the heat treatment is generally performed at a temperature of Tm-5°C or more, particularly Tm-5 to Tm+20°C, based on the melting point (Tm) of the resin coating.
  • the heating time varies depending on the heating method and cannot be generally defined, but is generally preferably in the range of 30 to 60 seconds.
  • the heated and cooled can bodies are then supplied to the printing means, but in the present invention, as described above, they can also be supplied to the partial heating means (HT2 in FIG. 1) before being supplied to the printing means. ).
  • this partial heating means HT2 it is preferable to partially heat a position of 0 to 15% from the top of the can body with respect to the height of the heated can body as the neck portion of the seamless can (partial heating means will be described later).
  • the can bodies heated by the heating means and from which the lubricant and the like have been removed are then supplied to the printing means.
  • a printing means conventionally known printing methods such as gravure printing, offset printing, flexographic printing, and inkjet printing can be employed.
  • the printing layer is formed by baking and drying by the drying/baking means.
  • a finish varnish layer is formed on the printed layer to prevent the printed image from being damaged. From the standpoint of design, it is preferable that the printed layer is formed not only on the center of the can body but also on the portion to be necked.
  • Diameter reduction rate (%) (D 0 - D 1 )/D 0 ⁇ 100 (1)
  • D 0 is the inner diameter of the can body within 15 to 60% from the top of the can body
  • D 1 is the inner diameter of the can body at the maximum diameter reduction portion (most reduced diameter portion).
  • a can body (seamless can) having a neck portion and a flange portion formed by the neck/flange processing means is preferably supplied to the partial heating means as described above (HT3 in FIG. 1).
  • the finished product can be obtained by heating a portion of the height of the can from 0 to 15% from the open end.
  • the partial heating means for the neck portion of the seamless can is arranged in any one of HT1, HT2 and HT3. This makes it possible to control the oriented crystals of the resin coating, improve the adhesion between the resin coating and the metal plate, and suppress the separation of the resin coating at the neck portion.
  • the partial heating means may be arranged at any position of HT1 to HT3, but it is preferable to directly heat the neck portion, which is the portion to be improved in adhesion to the metal plate, in the state of the finished product. Since the crystals can be controlled efficiently and the molding distortion of the resin coating due to the neck/flanging process can be alleviated, it is preferable to be installed at the position of HT3, which heats the seamless can particularly after the neck/flanging process. is.
  • heating means can be used as the heating means, but high-frequency induction heating is particularly preferred.
  • high-frequency induction heating heats the metal plate and heats the interface between the metal plate and the resin coating, so the adhesion between the resin coating and the metal plate can be efficiently improved.
  • the heating time cannot be categorically defined depending on the heating temperature and heating method, but is preferably in the range of 0.05 to 40 seconds. It is preferable to heat in the range of 0.1 to 0.6 seconds.
  • the resin coating When a polyester resin is used as the resin coating, it is desirable to partially heat the resin to a temperature in the range of 185 to 230°C, particularly 190 to 210°C.
  • the partial heating is performed by high-frequency induction heating, only the neck portion of the seamless can is selectively heated.
  • the heating time is the time until the temperature is reached. In the case of oven heating, the above temperature is the highest temperature reached in the oven, and the time during which the highest temperature is maintained is defined as the heating time.
  • High-frequency induction heating is not limited to this, but high-frequency waves with a frequency of 10 to 200 KHz are used.
  • a heating device having a known high-frequency induction heating coil can be used.
  • This heating device generally includes a high-frequency induction heating coil, an electrode for connecting the coil and a power supply, a magnetic member that strengthens the electromagnetic coupling between the coil and the seamless can and regulates the heating portion of the seamless can, and a coil that cools the coil. It consists of a cooling mechanism for
  • FIG. 3 is a diagram for explaining specific examples of the partial heating means and the partial heating conveying means.
  • the partial heating conveying means includes a partial heating process turret T6 that revolves around a horizontal rotating shaft 8, and the partial heating means 7 is installed at a position facing the outer peripheral portion of the partial heating process turret T6 where the can body 10 is installed. ing.
  • the partial heating process turret T6 also has a rotation mechanism 9 for rotating the can body 10 on its axis.
  • the rotation mechanism 9 includes a rotary shaft 9b having suction means 9a for fixing the bottom portion 12 of the can body 10 by vacuum suction, and a drive means (not shown) for rotating the rotary shaft.
  • a gear may be used, or a motor may be arranged on each rotating shaft 9b to drive.
  • the can body 10 fixed by the suction means 9a passes through the partial heating means 7 due to the revolution of the partial heating process turret T6 while rotating on its own axis due to the rotation of the rotating shaft 9b, whereby the neck portion 11 is heated. .
  • the neck portion is heated while rotating on the revolving turret, so that the entire circumference of the neck portion can be heated uniformly and efficiently.
  • FIG. 4 is a partial cross-sectional view for explaining an example of arrangement of high-frequency induction heating coils in the partial heating means 7 in FIG. Partial heating step
  • the partial heating means 7 installed along the turret T6
  • four arc-shaped copper pipes 71, 71 and 72, 72 are arranged two on each side so as to be positioned near the neck of the seamless can. It is The interval L1 between the two copper pipes 71, 71 on the flange portion 13 side of the seamless can 10 is narrower than the interval L2 between the two copper pipes 72, 72 on the bottom portion 12 side in accordance with the diameter reduction of the neck portion 11. are placed.
  • the copper pipe can be appropriately set according to the can diameter of the seamless can, the height of the neck portion, etc. It is preferable to have
  • the cross-sectional shape of the pipe may be circular, square, elliptical, semicircular, oval, or any other shape.
  • the partial heating conveying means is not limited to turret conveying, and existing conveying means such as a conveyor may be used.
  • the partial heating conveying means is turret conveying, the partial heating conveying means and the neck/flange processing means are connected by a conveying turret so that the flanging turret T4 and the partial heating process turret T6 can be efficiently conveyed.
  • the seamless can of the present invention includes a drawing step of forming a shallow-drawn can by drawing using a metal plate having a resin coating formed on the inner surface and/or the outer surface, and drawing and ironing the shallow-drawn can by redrawing and ironing.
  • a heating step of heating the entire drawn and ironed can obtained by forming by a conventionally known forming method such as a redraw and ironing forming step for forming a can, and printing is applied to the outer surface of the body of the drawn and ironed can that has undergone the heating step.
  • the portion that will become the neck portion when a seamless can is formed is formed between the draw forming step and the redraw and ironing step, between the heating step and the printing step, and after the neck/flanging step.
  • the partial heating step it is an important feature to partially heat the can body while conveying it.
  • the seamless can manufacturing method of the present invention is not particularly limited, except that the above-described partial heating step is performed at any of the above-described timings, and in the partial heating step, the can body is heated while being conveyed. However, it is preferable to use the method and conditions in each step in the seamless can manufacturing method of the present invention described above. can.
  • a seamless can manufactured by the manufacturing apparatus and manufacturing method of the present invention has a resin coating formed on the inner surface and/or the outer surface of a metal plate, and the upper portion of the can body is necked (reduced in diameter).
  • a printed layer and a finishing varnish layer are formed on the outer resin coating.
  • the neck portion is, but is not limited to, 0 to 0 from the top of the can body with respect to the height of the entire can from the top of the can body (0%) to the bottom (100%) of the seamless can. It is preferably formed in at least a portion of the positions within 15% of the distance.
  • the seamless can manufactured by the manufacturing apparatus and manufacturing method of the present invention has excellent adhesion between the resin coating and the metal plate in the neck portion, and effectively suppresses peeling of the resin coating.
  • a polyester resin is used as the resin coating, even when exposed to high temperature and high humidity conditions such as retort sterilization, whitening such as retort brushing occurs, and lubricant removal and molding during the can manufacturing process Even when the entire can is exposed to high-temperature conditions in the heating process for the purpose of relaxing strain, the occurrence of whitening such as white streaks is suppressed.
  • resin-coated metal plate As the resin-coated metal sheet used for manufacturing seamless cans by the manufacturing apparatus and manufacturing method of the present invention, resin-coated metal sheets conventionally used for forming seamless cans can be used.
  • resin sheets cold-rolled steel sheets are temper-rolled or secondary cold-rolled after annealing, and are subjected to surface treatments such as zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment, chromic acid treatment, and zirconium compound treatment.
  • a light metal plate such as an aluminum alloy plate is used in addition to a surface-treated steel plate subjected to two or more kinds of treatment, or a so-called aluminum plate.
  • the light metal plate may be subjected to an inorganic surface treatment such as chromate phosphate treatment, zirconium phosphate treatment, or zirconium treatment.
  • the raw thickness of the metal plate varies depending on the type of metal and the purpose or size of the container, but generally it is preferable to have a thickness of 0.10 to 0.50 mm.
  • polyester resins can be preferably used.
  • polyester resin constituting the outer surface resin coating from the viewpoint of suppressing retort brushing and the generation of white streaks, polybutylene terephthalate single resin or copolymer resin mainly composed of butylene terephthalate units is used in an amount of 20 to 60% by mass, particularly 45 to 45% by mass. It is preferable that it is contained in an amount of 55% by mass and the remaining component is a polyethylene terephthalate homopolymer (PET) or a copolymer resin mainly composed of ethylene terephthalate units.
  • PET polyethylene terephthalate homopolymer
  • copolymer resin mainly composed of ethylene terephthalate units.
  • the same polyester resin as that for the outer resin coating can be used as the polyester resin that constitutes the inner resin coating. It is preferable that the copolymer resin is a copolymer resin that can Copolymerized PET containing in an amount of mol % can be preferably used.
  • the polyester resin preferably has an intrinsic viscosity (IV) measured using a phenol/tetrachloroethane mixed solvent as a solvent in the range of 0.5 to 1.4 dL/g, particularly 0.65 to 1.4 dL/g. is preferably in the range of If the intrinsic viscosity is higher than the above range, the melt viscosity of the resin when heated and melted becomes extremely high, making it difficult to coat the metal plate with the resin, which is not preferable. On the other hand, if the intrinsic viscosity is less than the above range, it cannot withstand severe working such as drawing and ironing, and the flavor properties and corrosion resistance are also inferior, which is not preferable.
  • the glass transition temperature (Tg) of the polyester resin is preferably in the range of 30-80°C, more preferably in the range of 50-65°C. In particular, if the Tg is higher than the above range, there is a possibility that the processability will deteriorate. On the other hand, if the Tg is lower than the above range, the retort whitening resistance and the like may be deteriorated.
  • the melting point (Tm) of the polyester resin is preferably in the range of 200-260°C, more preferably in the range of 215-235°C. If the melting point is lower than the above range, the resistance to retort whitening may deteriorate.
  • polyester resin is blended with additives for resins known per se, such as anti-blocking agents such as amorphous silica, pigments such as titanium dioxide, antistatic agents, antioxidants, lubricants, etc., according to known formulations. be able to.
  • anti-blocking agents such as amorphous silica
  • pigments such as titanium dioxide, antistatic agents, antioxidants, lubricants, etc.
  • the thickness of the outer resin coating is not limited to this, it is preferably in the range of 5 to 20 ⁇ m.
  • the outer surface resin coating may be a multilayer of two or more layers. In the case of multiple layers, it is important that at least all the layers other than the bottom layer are coated with the above-mentioned PBT-containing outer surface resin coating. In the case of multiple layers, it is desirable that the total thickness is within the above range.
  • the thickness of the inner surface resin coating is not limited to this, it is preferably in the range of 10 to 30 ⁇ m.
  • the inner resin coating may be either a single layer or multiple layers.
  • the lower layer uses PETIA with an isophthalic acid content of 9 to 15 mol%, and the surface layer has a higher isophthalic acid content than the lower layer. It is particularly desirable to use PETIA or homoPET with a low isophthalic acid content of 9 mol % or less.
  • the thickness ratio between the lower layer and the surface layer is not limited to this, but is preferably in the range of 8:2 to 4:6.
  • the resin-coated metal sheet used for manufacturing seamless cans by the manufacturing apparatus and manufacturing method of the present invention is coated with a polyester resin coating by a conventionally known method such as an extrusion lamination method, a heat-sealing method, or a dry lamination.
  • a polyester resin coating by a conventionally known method such as an extrusion lamination method, a heat-sealing method, or a dry lamination.
  • An adhesive primer may be used to further improve the adhesion of the polyester resin coating to the metal plate.
  • a primer coating excellent in adhesion and corrosiveness conventionally known primers such as epoxy phenol-based primer coating and polyester phenol-based primer coating can be used.
  • a polyester-phenolic primer coating consisting of a resol-type phenolic resin derived from cresol.
  • the seamless can production apparatus and production method of the present invention can produce a seamless can in which the resin coating has excellent adhesion to the metal plate and the peeling of the resin coating at the neck is suppressed.
  • a polyester resin it can be suitably used as an apparatus and method for manufacturing seamless cans for filling contents that require retort sterilization, steaming, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
PCT/JP2022/038537 2021-11-05 2022-10-17 シームレス缶の製造装置及び製造方法 Ceased WO2023079935A1 (ja)

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JP2021-180985 2021-11-05
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WO2025004550A1 (ja) * 2023-06-28 2025-01-02 東洋製罐株式会社 加熱装置および缶体の製造方法

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JPH08117903A (ja) * 1994-10-25 1996-05-14 Kishimoto Akira 耐食性の向上した印刷シームレス缶の製造方法
JPH0919733A (ja) * 1995-06-30 1997-01-21 Toyo Seikan Kaisha Ltd ２ピース缶胴を成形する方法
JPH09278038A (ja) * 1996-04-09 1997-10-28 Daiwa Can Co Ltd フイルム貼着缶体およびその製造方法
JP2004148324A (ja) * 2002-10-28 2004-05-27 Toyo Seikan Kaisha Ltd 樹脂被覆金属絞りしごき缶の製造方法
JP2007296565A (ja) * 2006-05-01 2007-11-15 Daiwa Can Co Ltd 樹脂被覆シームレス缶製造方法、及びその装置
JP2013099761A (ja) * 2011-11-08 2013-05-23 Toyo Seikan Kaisha Ltd 容器の処理装置
JP2013107093A (ja) * 2011-11-18 2013-06-06 Daiwa Can Co Ltd ボトル型缶の製造方法およびボトル型缶

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JPH08117903A (ja) * 1994-10-25 1996-05-14 Kishimoto Akira 耐食性の向上した印刷シームレス缶の製造方法
JPH0919733A (ja) * 1995-06-30 1997-01-21 Toyo Seikan Kaisha Ltd ２ピース缶胴を成形する方法
JPH09278038A (ja) * 1996-04-09 1997-10-28 Daiwa Can Co Ltd フイルム貼着缶体およびその製造方法
JP2004148324A (ja) * 2002-10-28 2004-05-27 Toyo Seikan Kaisha Ltd 樹脂被覆金属絞りしごき缶の製造方法
JP2007296565A (ja) * 2006-05-01 2007-11-15 Daiwa Can Co Ltd 樹脂被覆シームレス缶製造方法、及びその装置
JP2013099761A (ja) * 2011-11-08 2013-05-23 Toyo Seikan Kaisha Ltd 容器の処理装置
JP2013107093A (ja) * 2011-11-18 2013-06-06 Daiwa Can Co Ltd ボトル型缶の製造方法およびボトル型缶

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025004550A1 (ja) * 2023-06-28 2025-01-02 東洋製罐株式会社 加熱装置および缶体の製造方法

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