JP2009178771A - Method for manufacturing synthetic resin coated draw-and-iron processed metal can body, and fabricating apparatus thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a resin coated DI processed can body excellent in quality and free from any film damage, in which the fabrication process can be simplified without any need for degreasing and cleaning after DI processing and the occurrence of film damage in the heating process can be surely prevented even in a high-speed fabrication line. <P>SOLUTION: The forming of a can body by DI processing is performed by dry forming. A multiple-line distribution apparatus 10 is provided in the can body conveyance path through which a can body, the edge of whose opening part is cut off, is supplied to a heat set oven 7. Can bodies conveyed in a single line at a close spacing from one another are distributed by the apparatus 10 into multiple lines so that each can body may have space all around it, and then the can bodies are heated while they are conveyed separately in the multiple lines at such a space that they do not contact from one another in the heat set oven. By this heat set, stress of synthetic resin coating after forming of the can bodies is released. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and apparatus for manufacturing a synthetic resin-coated drawn and ironed metal can.

  Conventionally, aluminum two-piece cans or steel two-piece cans that have been formed by squeezing and ironing (hereinafter referred to as DI processing) from aluminum plates or steel plates have been widely distributed. No need for inner surface coating, and it is excellent in maintaining the flavor of the contents (flavorability). For example, a synthetic resin-coated squeezed iron with a synthetic resin film such as a polyester film laminated on both sides of the metal plate Synthetic resin-coated drawn and ironed metal cans (hereinafter simply referred to as resin-coated DI cans) such as cans and synthetic resin-coated drawn and ironed steel cans have been proposed.

  Resin-coated DI cans are susceptible to damage to the coated synthetic resin film and pinholes and other film damage. Therefore, to ensure quality such as corrosion resistance and flavor, film damage occurs during production. It is a necessary condition not to be. Therefore, as a conventional method for producing a resin-coated DI can body, various proposals have been made in terms of the DI processing condition surface and the material surface of the synthetic resin film so as not to cause film damage (for example, Patent Documents 1 to 3). However, the manufacturing is performed by a manufacturing process and a manufacturing apparatus almost similar to the manufacturing process of the conventional aluminum DI can body except that there is no inner surface coating process.

Japanese Patent Laid-Open No. 11-314123 JP-A-10-291277 Japanese Patent Publication No.59-34580

In the manufacturing process of DI can body, a heating process of heating through the oven is required several times for heat treatment of DI-shaped can body, vaporization removal treatment of solvent after coating and drying treatment. In the heating process in the manufacturing process of the DI can body, the can body is heated while being transported in a dense state in order to prevent the enlargement of the oven and increase the efficiency. In the oven, the laminated resin film is softened by heating and is very easily damaged. For this reason, the conventional heating method can prevent the film from being damaged in the molding process. There is a drawback that film damage is likely to occur at the contact portion due to the contact shock between them. This point becomes more remarkable as the speed increases. Further, the synthetic resin-coated drawn and ironed metal can has a problem that distortion due to molding remains in the synthetic resin film in a can forming process in which drawing and ironing is performed.
In addition, the drawn and ironed metal can body has a valley-like opening end, so the subsequent transportability is poor, particularly when sorting and transporting in multiple rows, the sorting and transporting obstacles are good, and good In some cases, it cannot be supplied to an oven or the like while maintaining a proper transport posture.
Furthermore, the conventional DI processing of the resin-coated DI can body is similar to the conventional DI processing of an aluminum DI can body that is not resin-coated, because the DI processing is performed while applying lubricant and coolant. Then, it is necessary to perform so-called degreasing and cleaning that removes the lubricating oil and coolant adhering to the outer surface of the can after molding.

  Therefore, the present invention can reliably prevent the occurrence of film damage in the heating process even in a high-speed production line, and can also reliably remove distortion due to molding of the coating film, and has excellent quality without film damage. The present invention provides a novel synthetic resin-coated squeezed and ironed metal can manufacturing method and apparatus that can obtain a resin-coated DI can body that does not require degreasing and cleaning after DI processing and that has a simplified manufacturing process. It is for the purpose.

  The synthetic resin-coated squeezed and ironed metal can body manufacturing method of the present invention that solves the above-mentioned problems is obtained by cup-molding a metal plate coated with a synthetic resin film on both sides, and then molding the can body by squeezing and ironing process. A method of manufacturing a coated squeezed and ironed metal can body, after forming a cup from a metal plate coated with a synthetic resin film on both sides, and then forming a can body by squeezing and ironing to form a synthetic resin-coated squeezed and ironed metal can body A method of manufacturing, a can body forming step in which a cup is drawn and ironed by a body maker to form a can body, and a can body edge cutting process in which the formed can body is edge-cut by a body trimmer. After the process and the can body edge cutting process, a heat set process is provided to remove the distortion of the synthetic resin coating. In the heat set process, a heat set orb is provided. While conveying away the inner back and forth and left and right intervals can body with each other not in contact with the multi-row state, characterized in that to perform the heat-set by heating.

  In the method for producing a synthetic resin-coated squeezed and ironed metal can, the can forming step can be performed by dry forming, so that a degreasing and cleaning step in a subsequent step can be omitted, the process can be shortened, and a lubricant or coolant. Therefore, it is desirable that no environmental protection measures be taken for these treatments. Further, in the above method for producing a synthetic resin-coated squeezed and ironed metal can, the cans that have been trimmed by each body trimmer are transported in a single-row dense state, and distributed in multiple rows before being supplied to the heat set oven. By providing a multi-row sorting process that conveys the front, rear, left, and right with an interval, the interval between the cans can be effectively expanded to the front, back, left, and right.

  Moreover, the synthetic resin-coated squeezed iron metal can manufacturing apparatus of the present invention is a cup formed from a metal plate coated on both sides with a synthetic resin film, and then molded into a can body by squeezing and ironing to squeeze and squeeze the synthetic resin coating. Synthetic resin coated squeezed and ironed metal can body manufacturing equipment for manufacturing metal can bodies, body maker for squeezing and squeezing the cup to form a synthetic resin coated squeezed and ironed metal can body, and opening of the formed can body A body trimmer to be trimmed, and a heat set oven that heats the can body trimmed by the body trimmer to remove distortion of the synthetic resin coating, and a can body that is supplied to the heat set oven downstream of the body trimmer. It is characterized by having a multi-row sorting device that distributes in multi-rows and transports them at intervals in front and rear, left and right in the transport direction.

In the apparatus for manufacturing a synthetic resin-coated squeezed and ironed metal can body according to the present invention, the multi-row sorting device includes a pair of star wheels arranged with a can feed interval, and the plurality of can body members of the star wheel are connected to each other. Among the joint recesses, a predetermined engagement recess is provided with an adsorption means for adsorbing the can body engaged with the engagement recess so that the adsorption means of the pair of star wheels facing each other do not face each other. Those arranged with a shifted pitch can be suitably employed. It is desirable that a body maker who draws and squeezes the cup to form a synthetic resin-coated squeezed and ironed metal can body squeezes and squeezes the cup by dry molding.
Each of the above-described production methods and apparatuses for the synthetic resin-coated squeezed and ironed metal can is suitable as a method and apparatus for producing a synthetic resin-coated squeezed and ironed aluminum can or a synthetic resin-coated squeezed and ironed steel can.

According to the invention described in claim 1 of the present application, since the heat set process is provided after the can body rim cutting process following the can body forming process by the can body squeezing and ironing process, the can body is squeezed and rimmed. Thus, the distortion of the coating film received can be favorably removed, and a favorable can body can be obtained having a positive influence on the subsequent process. Since the opening end of the metal can body in the state of being drawn and ironed has a mountain-like shape, the transportability in the multi-row sorting process before the heat setting process is deteriorated. Since the part is cut with a body trimmer and then fed to the multi-row sorting process and then fed to the heat setting process, the can body can be kept in a good posture in the heat setting process, The can body can be well distorted.
And in the heat setting process, heating and heat setting are carried out while transporting in multiple rows in front and rear, left and right at intervals where the cans do not contact each other in the heat setting oven. Generation | occurrence | production can be prevented reliably and the resin-coated DI can body excellent in high quality without film damage can be obtained.
According to the invention of claim 2, since the can molding process is performed by dry molding, the degreasing and cleaning process of the subsequent process can be omitted, the process can be shortened, and a lubricant and a coolant can be added. Since they are not used, it is not necessary to take environmental conservation measures for their processing. Furthermore, according to the invention of claim 3, the cans cut off by each body trimmer are transported in a single row dense state, and are distributed in multiple rows before being supplied to the heat set oven, and are spaced apart from front to back and left and right in the transport direction. By providing a multi-row sorting process that opens and conveys the can, the interval between the cans can be effectively expanded in the front-rear and left-right directions.

  Further, according to the invention of claim 4, the manufacturing method of claim 1 can be carried out reliably, and the same effect as in claim 1 can be obtained. According to the configuration, the can body can be effectively spaced along the transport direction, and can be widened in the width direction. Therefore, the can body can be held in the minimum necessary interval and supplied into the heat set oven, the synthetic resin film of the can body can be prevented from being damaged by heating, and the efficiency of the oven can be improved. it can.

It is a block diagram which shows the system configuration | structure of the manufacturing method and manufacturing apparatus of the synthetic resin coating aluminum squeezing and ironing can which concern on embodiment of this invention. It is a plane schematic diagram which shows the arrangement | positioning form from a cupping press to heat set oven. 1 is a schematic plan view of an outline of a multi-row sorting apparatus in a synthetic resin-coated aluminum squeezed iron can body according to an embodiment of the present invention. It is a front schematic diagram which shows the outline of the space | interval adjustment apparatus in the manufacturing apparatus of the synthetic resin coating aluminum squeezing and ironing can body which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a method and an apparatus for manufacturing a synthetic resin-coated drawn and ironed metal can body according to an embodiment of the present invention. In the present embodiment, a method and apparatus for manufacturing a synthetic resin-coated squeezed and ironed aluminum can body will be described. However, the following method and apparatus are used for other synthetic resin-coated squeezed and ironed steel can bodies and other synthetic resin-coated squeezed and ironed metal can bodies. The present invention can also be applied to a manufacturing method and apparatus. In the block diagram, the inspection process is omitted, but inspection processes such as a can pinhole inspection, a film damage inspection, a necking crack inspection, and a flange crack inspection are naturally incorporated in the actual manufacturing process.

  The can manufacturing process of this embodiment includes a resin-coated aluminum plate feeding process a, a cup forming process b, a can forming process c, an edge cutting process d, a multi-row sorting process e, an interval adjusting process f, a heat setting process g, It consists of a can outer surface printing step h, a curing step i, a neck forming step j, and a flange forming step k. Hereinafter, each process is demonstrated in order. A synthetic resin film such as a PET film or a polyester film is laminated on both sides of the aluminum plate, and is set in the uncoiler 1 in a coiled state. The aluminum plate is fed to the cupping press 2 in a resin-coated aluminum plate feeding process a. The cupping press 2 forms a cup by punching a resin-coated aluminum plate and performing a shallow drawing process (cup forming step b). The molded cup is conveyed by the conveyor 5 (FIG. 2) and supplied to the body maker 3. The body maker 3 is arranged in parallel along the conveyor (5 in the embodiment shown in FIG. 2) in parallel so that the cupping press 2 having a higher processing speed than the body maker 3 can be operated at the maximum processing speed. We are trying to speed up the line.

  In the body maker 3, the cup formed by the cupping press 2 is further deep drawn and ironed to form a can body (can body forming step c). In this can body forming step, unlike the case of a normal DI can body forming step, the can body forming step is performed by dry forming without using a lubricating oil or a coolant. This eliminates the need for degreasing and cleaning in the normal DI can manufacturing process in order to remove the lubricant and coolant after molding, shortening the process and reducing the lubricant, coolant, and cleaning water. Can be omitted.

  The can body formed into a cylindrical shape with a bottom by the body maker 3 is edge-cut at the upper opening by the body trimmer 4 directly connected to each body maker, and is aligned to a predetermined height (edge cutting step d). . And it supplies to the heat setting oven 7 which performs the heat setting process of the next process. The main purpose of the heat setting is to remove distortion caused by the formation of the coating film, and it is necessary to hold the molded can body for a certain period of time in a heat treatment furnace at a high temperature (160 ° C. to 240 ° C.). Therefore, if the cans are conveyed in a heat set oven in a state where they are in contact with each other, the heated coating resin may be damaged by impact or the like. In order to prevent this, in the present invention, special measures are taken so that the cans are transported at predetermined intervals in both the transport direction and the left-right direction so that the cans do not contact each other in the oven.

  That is, in this embodiment, the cans sent from each body trimmer 4 are sent in parallel in a single-row dense state by the conveyor 6, as shown in FIG. Each row is divided into three rows at a predetermined position in parallel. As a mechanism for this, a multi-row sorting apparatus 10 shown in FIG. 3 is provided. The multi-row sorting apparatus 10 of this embodiment is configured by arranging a pair of star wheels 12a and 12b having six can body engaging recesses 11 on both sides at intervals through which the can body passes. Among the can engagement recesses 11 of each star wheel, a pair of engagement recesses located on the opposite sides of the straight line is provided with suction means 13 so as to suck the cans every two cans. Yes. The adsorbing means of the star wheels 12a and 12b are arranged so as to face each other and be shifted in pitch so as not to adsorb the same can at the same time. In the present embodiment, the suction means 13 handles the aluminum can body, so that a vacuum hole is provided and sucked by the vacuum. However, when the steel can body is handled, it may be sucked by an electromagnet.

  The multi-row sorting device 10 is provided at the downstream end of the conveyor 6, and the can body is transported in a single-row dense state at the center in the conveyor axial direction above the transport surface of the conveyor 6 up to the multi-row sorting device 10. Thus, a pair of can conveyance guides 15 are provided to form a single row dense conveyance path 16. On the downstream side of the multi-row sorting apparatus 10, a branch conveyance conveyor 17 composed of a belt conveyor is provided. Above the conveyance surface of the branch conveyance conveyor, three rows centering on the extension of the single row dense conveyance path 16 are provided. The parallel can body guides 18 are provided so as to form the branched conveyance paths 17a, 17b, and 17c, and are conveyed with a predetermined interval in the conveyor width direction.

Figure 3 shows a state in which the left side of star wheel 12a is adsorbed the can body has been reached between the star wheel, the can body C ₁ is located upstream side of the branch passage 17a with the rotation of the star wheel When the suction of the suction means is released when it is positioned upstream of the branch transport path 17a, it is released from the can body holding engagement recess 11 and is branched by the branch transport conveyor 17 along the branch transport path 17a. Be transported. Similarly, the next can body C ₂ is attracted by the suction means 13 of the right star wheel 12b, distributed to the branch transport path 17c, and transported along the branch transport path 17c. Further, since the next can body C ₃ engages with the can body engaging recesses on which the adsorbing means are not provided on both star wheels, the next can body C ₃ goes straight and is distributed to the central branch conveyance path 17b. By repeating the above, the cans that are conveyed in a single-row dense state are sequentially divided into three rows, so that intervals can be made along the carrying direction and also spaced in the width direction so that they do not contact each other. Be transported. Therefore, since the cans are heated without being brought into contact with each other by being conveyed to the heat set oven in this state, the synthetic resin film can be prevented from being damaged.

  However, if one row is transported in three rows, the distance in the transport direction of each row is increased by two cans, so the can transport interval in the heat set oven is too wide, and energy is increased accordingly. Wasteful and inefficient. In order not to cause damage to the coating of the can bodies, the can bodies may be transported as far as they do not come into contact with each other. Therefore, in the present embodiment, in order to increase energy efficiency in the heat set oven, the three rows As shown in FIG. 4 on the upstream side of the inlet of the heat set oven, the interval in the conveyance direction of the can body rows distributed in total (15 rows) is the minimum necessary interval in which the can bodies do not contact each other. An interval adjusting device 20 is provided.

  The interval adjusting device 20 includes the branch transfer conveyor 17, a transfer conveyor 21, and a heat set oven conveyor 22. The branch conveyance conveyor 17 is constituted by a belt conveyor having suction means, and is driven at a speed lower than the conveyance speed of the conveyor 6, and the vacuum means 23 (FIG. 2) so as to cross the lower surface of the conveyor in the middle. The can body that has reached this position is sucked and braked, and 2 to 3 can bodies are stagnated at that position, and are pushed by the succeeding can body to be conveyed downstream. Thereby, the intervals are adjusted so that the cans conveyed by the multi-row sorting apparatus 10 with an interval in the conveyance direction come into contact with each other again on the branch conveyance conveyor 17 along the conveyance direction. Note that the suction force of the vacuum means 23 can be adjusted as appropriate by means of a damper.

The transfer conveyor 21 is composed of a vacuum conveyor having a vacuum box 24, provided above the branch transport conveyor 17 and the heat-set oven conveyor 22, and the opening of the can C reaching the downstream end of the branch transport conveyor 17. The upper end portion is adsorbed, conveyed in a suspended state, and transferred onto the heat set oven conveyor 22. The transfer conveyor 21 is driven at a speed higher than the speed v ₁ of the branch transfer conveyor 17, whereby the transfer interval of the cans is expanded again and transferred. The interval is the speed v _{2 of the} transfer conveyor 21. Since it can adjust to arbitrary intervals by adjusting, it can adjust suitably so that it may become the minimum necessary interval which can bodies do not contact mutually. The heat set oven conveyor 22 is driven at v ₃ at the same speed as the transfer conveyor 21. Therefore, in the heat set oven 7, the cans can be transported at a necessary minimum interval that does not contact each other, and the energy efficiency of the heat set oven can be improved.

  The heat-set oven conveyor 22 is composed of a vacuum conveyor, and conveys the bottom of the can body while adsorbing the bottom. Thereby, the resin-coated aluminum can body having a lighter weight than the steel can body can be stably conveyed.

  The can body from which the distortion of the synthetic resin coating generated by the molding is removed by being heated in the heat set oven 7 is aligned in a single row when it comes out of the heat set oven 7, and is supplied to the can body printing machine 30. Predetermined printing is performed on the outer surface (can body outer surface printing step h). The can body that has been printed is carried into the curing oven 31 and baked (curing step i). After that, neck molding is performed by the body necker 32 (neck molding process j) and flange molding is performed by the flanger 33 (flange molding process k) to complete a synthetic resin-coated aluminum drawn iron can body. In this way, the manufactured can body is further subjected to necessary inspections such as film damage inspection, necking crack inspection, flange crack inspection, inner surface dirt inspection, outer surface bottom dirt inspection, outer surface body dirt inspection, etc. After palletizing, it is shrink-wrapped and prepared for shipment.

  The method and apparatus for producing a synthetic resin-coated aluminum squeezed iron can according to the present embodiment is configured as described above. However, the present invention is not limited to the above-described embodiment, and various methods are possible within the scope of the technical idea. Design changes are possible. For example, the can body multi-row sorting device is not necessarily limited to the star wheel, and various multi-row sorting devices can be employed, and is not limited to the case of sorting from a single row to three rows. Further, the present invention is not limited to the aluminum squeezed iron can body, but can be applied to other squeezed iron metal can bodies such as a synthetic resin-coated steel squeezed iron can body. And in the case of a steel can body, not only a vacuum but a magnet may be adopted as can body adsorption means in a multi-row branching device and an interval adjusting device.

  The synthetic resin-coated squeezed and ironed metal can manufacturing method and apparatus of the present invention can reliably prevent the occurrence of film damage in the heating process even in a high-speed production line, and is excellent in quality without film damage. A coated DI can body can be obtained, and there is no need for degreasing and cleaning after DI processing, it is environmentally friendly, and the manufacturing process is simplified. High availability.

1 uncoiler 2 cupping press 3 body maker 4 body trimmer 6 conveyor
7 Heat set oven 10 Multi-row sorting device
11 Can engaging recess 12 Star wheel 13 Adsorption means 15, 18 Can body guide
16 Single row dense conveyance path 17 Branch conveyance conveyors 17a to 17c Branch conveyance path 20 Interval adjustment device
21 Transfer conveyor 22 Heat set oven conveyor
23 Vacuum means 30 Can body printing machine
32 Bodyneca 33 Flanger

Claims (6)

  This is a method of manufacturing a metal can body by forming a can body by forming a cup from a metal plate covered with a synthetic resin film on both sides and then drawing and ironing, and then squeezing the cup by a body manufacturer. A can body forming process for forming a can body by processing, a can body edge cutting process for cutting the opening of the can body with a body trimmer, and a synthetic resin coating after the can body edge cutting process A heat setting process for removing distortion is provided, and in the heat setting process, heating and heat setting are carried out while transporting in multiple rows in front and rear, left and right at intervals where the cans do not contact each other in the heat setting oven. A synthetic resin-coated drawn and ironed metal can manufacturing method characterized in that it is performed.   The method of manufacturing a synthetic resin-coated drawn and ironed metal can according to claim 1, wherein the can forming step is performed by dry forming.   A multi-row sorting process in which the cans cut by the body trimmers are transported in a single-row dense state, and are distributed in multiple rows before being supplied to the heat set oven, and transported at intervals in the front, rear, left, and right in the transport direction. The method for producing a synthetic resin-coated drawn and ironed metal can according to claim 1 or 2, characterized in that it is provided.   In a synthetic resin-coated squeezed and ironed metal can body manufacturing apparatus, a cup is formed from a metal plate covered with a synthetic resin film on both sides, and then a can body is formed by squeezing and ironing to produce a synthetic resin-coated squeezed and iron metal can body. , A body maker that squeezes and squeezes the cup to form a synthetic resin-coated squeezed and squeezed metal can body, a body trimmer that trims the opening of the molded can body, and a can body that is trimmed by the body trimmer, A heat-set oven that removes the distortion of the synthetic resin coating, and the cans supplied to the heat-set oven are distributed downstream of the body trimmer in multiple rows and transported at intervals in the front-rear and left-right directions. A manufacturing apparatus for a synthetic resin-coated squeezed and ironed metal can characterized by having a multi-row sorting apparatus.   5. The synthetic resin-coated drawn and ironed metal can manufacturing apparatus according to claim 4, wherein the cup is drawn and ironed by dry molding.   The multi-row sorting apparatus includes a pair of star wheels arranged with a can feed interval, and among the plurality of can engaging recesses of the star wheel, a predetermined engaging recess includes the engaging recess. 6. An adsorbing means for adsorbing a can body engaged with each other is provided, and the adsorbing means is arranged with a pitch shifted so that the adsorbing means of a pair of opposing star wheels do not oppose each other. An apparatus for producing a can with a synthetic resin-coated drawn and ironed metal body as described in 1.

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