JP4514073B2 - Molding method of can lid with identification mark - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a can lid identification mark Ru decorated to identify like container manufacturing plants and production lines, in particular, an annular groove (countersink portion) of the reinforcing the panel portion and the annular projection relates to a method for effectively forming the identification mark in Rukanfuta (bead portion) is formed.
[0002]
[Prior art]
For canned foods and beverages, if a defective product is found in the product, the can and the production line where the can is made can be easily known and can be handled appropriately. Displaying manufacturing information on the bottom lid has been conventionally performed, and in addition to the canned information as described above, a manufacturing factory for the container itself is prepared in case a defective product is generated due to the container itself. In order to identify production lines, etc., it has been conventionally practiced to put information on production containers as identification marks on can containers, and such identification marks can be used as can lids (can bodies as top lids or bottom lids). It has also been conventionally known that it is applied to a panel portion or a winding portion of a can end plate portion fixed to the end of the plate (for example, Japanese Patent Publication No. 2-37308, Japanese Patent Publication No. 55-). No. 36542 gazette ).
[0003]
On the other hand, in positive cans with high internal pressure (positive pressure cans), such as canned foods containing carbonated beverages or beer, or canned beverages in which liquid nitrogen is dropped when filling the contents, the pressure resistance of the can lid with aluminum material In order to improve the strength, a so-called flat shell in which a flange curl portion is formed on the outside of a substantially disc-shaped panel portion via an inverted conical cylindrical chuck wall portion, between the panel portion and the chuck wall portion. In addition, it has been generally performed to form a countersink part that is an annular groove for reinforcement. Further, a countersink part is provided for a can lid provided with such a countersink part. It is also well known in the art that a bead portion for reinforcement is formed in an annular shape in the peripheral portion of the panel portion at a slight interval (see, for example, US Pat. No. 3,417,898). ).
[0004]
[Problems to be solved by the invention]
By the way, an identification mark for identifying a manufacturing factory or a production line of a container (particularly the can lid itself) is applied to the can lid in which the counter sink portion and the bead portion are formed for reinforcement as described above. In this case, it is preferable that such identification marks are not so conspicuous and easy to identify. For example, as shown in Japanese Examined Patent Publication No. 2-37308, when an identification mark is printed on the panel portion of the can lid, In order not to be mistaken as a mark for canned information, a dedicated printing device, a printing process, and a special identification process for applying an identification mark are required, which increases manufacturing costs. Become.
[0005]
On the other hand, if an identification mark is imprinted on the panel portion, there is a risk of damage such as cracking or peeling on the inner surface coating of the can lid. For example, as shown in Japanese Patent Publication No. 55-36542, the can lid winding process For example, an identification mark is engraved on the outer surface side or inner surface side of the tightening portion with a roll or chuck, or the identification mark is preliminarily printed on the outer surface side or inner surface side of the winding tightening portion by engraving or printing. In such a case, the identification mark is not very conspicuous, but the identification mark cannot be confirmed at a glance from the top (viewed from the top), and the identification mark cannot be confirmed from the side (or obliquely upward) depending on the viewing position. There is.
[0006]
In addition, a special roll or chuck for engraving is required even if a device or process for pre-engraving or printing is required at a position to be a tightening portion, or even if the engraving process is performed with a roll or a chuck. In any case, in the case of engraving, there is a possibility that rust is induced by damaging the outer surface coating of the can lid.
[0007]
An object of the present invention is to solve the above-described problems. Specifically, for a can lid having a panel reinforcing portion such as a counter sink portion or a bead portion, a container manufacturing factory or a manufacturing line is provided. It is possible to confirm an identification mark for identifying the above, etc. at a glance from above, and at the same time, such an identification mark can be used without requiring a dedicated device or process. It is an object of the present invention to enable application without damaging the inner and outer surfaces of the lid.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a can lid that is formed from a state in which an inverted conical cylindrical chuck wall portion and a flange curl portion are formed outside a substantially disc-shaped panel portion. When molding the counter sink part between the panel part and the chuck wall part by pressing to the upper surface side, a mold part that presses the panel part, and a mold part that receives the pressing force through the panel part On the other hand, an annular convex part is formed on one of the opposing surfaces of both mold parts and an annular concave part is formed on the other so as to bite the peripheral part of the panel part sandwiched between both mold parts. At the same time, with respect to the corner of the mold part that presses the panel, a groove-shaped recess is formed at a desired position in the circumferential direction so as to partially cut out the corner. Before forming the counter sink Then, after forming the reinforcing bead portion by biting the mold parts, the metal material for the can lid is drawn into the recesses cut out at the corners of the mold part when forming the counter sink part. Thus, between the counter sink part and the bead part, an identification mark is formed by concavity and convexity on the metal surface at a desired position in the circumferential direction .
[0009]
According to the method for forming a can lid with an identification mark of the present invention as described above, a desired position in the circumferential direction between the counter sink portion that is the reinforcing annular groove and the bead portion that is the annular protrusion for reinforcement. to, by being recessed identification mark by the unevenness of the metal surface, without such identification marks is noticeable by eye irregularities of the countersink portion and the bead portion is taken, moreover, the identification mark from above It can be confirmed at a glance, and when forming the countersink part and the bead part in the can lid forming process, it is possible to form the identification mark using the mold parts for forming them. .
[0010]
In other words, without such shaping by stamping an identification mark projecting tool, by the mold parts for molding the countersink portion and the bead portion in the molding process of the can lid, the can lid in the recess of the mold parts Since the identification mark can be molded to draw in the metal material, the metal surface can be used without requiring a dedicated device or process for the identification mark and without damaging the inner and outer surfaces of the can lid. An identification mark by the unevenness can be applied to the can lid.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the forming method of the identification mark with a can lid of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a can lid with an identification mark formed by the method of the present invention, and FIG. 2 shows such a can lid as viewed from (A) from above (in a top view). 2B shows a vertical cross section along the line BB in FIG. A, and (C) a vertical cross section along the line CC in FIG. 1A and 3B show the state when the bead portion is molded, and FIGS. 4A and 4B show the counter sink. It shows the state when the part and the identification mark are molded.
[0012]
The can lid 1 formed by the method of the present invention is made of, for example, an aluminum alloy (5182-H39) in which a mixed resin film of a polybutylene terephthalate resin and a polyethylene terephthalate resin having a thickness of 0.02 mm is thermally fused on both sides. A thin metal plate for can manufacturing such as a metal plate having a thickness of 0.305 mm is used as a material, and the metal plate is cut into a blank and press-molded. After the sealant made of the product is applied, it is fastened and fixed to the open end of the can body as the bottom cover or top cover of the can.
[0013]
As shown in FIG. 1, the can lid 1 is reinforced between a substantially disc-shaped panel portion 11 at the center portion and an inverted conical cylindrical chuck wall portion 12 formed inside the flange curl portion 13. A counter sink portion 14 is formed as an annular groove for use, and a bead portion 15 as a reinforcing annular protrusion is formed in the peripheral portion of the panel portion 11 at a slight distance from the counter sink portion 14. Further, an identification mark 16 for identifying a manufacturing factory, a manufacturing line, a punch number, etc. of a container (can lid) at a desired position in the circumferential direction between the counter sink portion 14 and the bead portion 15. Is recessed.
[0014]
That is, in the can lid 1 formed by the method of the present invention , the identification mark 16 is spaced in the circumferential direction at a portion between the counter sink portion 14 and the bead portion 15 as shown in FIG. A plurality of (three in the illustrated example) are provided, and each identification mark 16 has a counter sync as shown in FIG. 2 (C) as compared with other parts as shown in FIG. 2 (B). The factory which manufactured the container (can lid) by making it concave so that the corner | angular part between the part 14 and the bead part 15 may be dropped, and making the number and position (space | interval) of this identification mark 16 desired. And the production line and punch number can be specified.
[0015]
In one embodiment of the method of the present invention for forming the identification mark 16 in the can lid 1 in which the identification mark 16 is recessed in the portion between the counter sink portion 14 and the bead portion 15 as described above, This will be described below with reference to FIGS.
[0016]
FIG. 3A shows a state in which a flat shell (a can lid having a flat panel portion without a counter sink portion or a bead portion) is formed from a blank of a metal plate. The die cutter 21 and the punch coring 22 By sandwiching between the knockout ring 23, the shoulder support 24 and the panel foam ring 25, the inverted conical cylindrical chuck wall portion 12 and the flange curl portion 13 are integrally formed outside the flat panel portion 11.
[0017]
The panel foam ring 25 and the punch core 26 opposed thereto are formed with annular recesses 25a in the peripheral portion of the panel foam ring 25 with respect to the respective facing surfaces. Further, a groove-shaped recess 26b is formed at a corner of the punch core 26 at a desired position in the circumferential direction so as to partially cut out the corner. .
[0018]
By lowering the punch core 26 from such a state, the panel portion 11 sandwiched between the panel foam ring 25 and the punch core 26 is first pressed by the punch core 26 as shown in FIG. As a result, the annular convex portion 26 a formed on the punch core 26 side and the annular concave portion 25 a formed on the panel foam ring 25 side are engaged with each other, and the bead portion 15 is annularly formed around the panel portion 11. To be molded.
[0019]
Then, the punch core 26 is further lowered so as to push down the panel foam ring 25 from the state where the bead portion 15 is formed in an annular shape in the peripheral portion of the panel portion 11, thereby being sandwiched between the punch core 26 and the panel foam ring 25. The knockout ring 23 and the shoulder support 24 receive that the entire panel of the can is moved downward by the depression of the panel 11 while the panel 11 is pushed down (pressed toward the upper surface of the can lid). 4A, the outer peripheral portion of the panel portion 11 is folded back as the panel portion 11 is pushed down, and the counter sink portion 14 is interposed between the panel portion 11 and the chuck wall portion 12. Molded.
[0020]
At the time of molding the counter sink part, as shown in FIG. 4 (A), the part between the counter sink part 14 and the bead part 15 is formed between the panel foam ring 25 and most of the corners of the punch core 26. Since it is sandwiched by the punch core 26, it does not deform as the panel portion 11 is pushed down, and is formed into a state as shown in FIG. 4B, the portion between the counter sink portion 14 and the bead portion 15 is pulled into the recess 26b as the panel portion 11 is pushed down. As a result, as shown in FIG. 2C, the identification mark 16 is recessed with respect to the inner edge portion of the counter sink portion 14.
[0021]
In the can lid 1 in which the identification mark 16 is recessed in the inner edge portion (the portion between the counter sink portion 14 and the bead portion 15) of the counter sink portion 14 by the molding method of the present embodiment as described above , the counter sink portion 14 and the bead portion 15 are not conspicuous due to the concavity and convexity of the bead portion 15, and the identification mark 16 can be confirmed at a glance from above.
[0022]
Further , according to the molding method of the present embodiment as described above , the recess (groove portion) 26b is formed at a desired position of the corner portion of the punch core 26 which is a mold part for molding the counter sink portion 14. Therefore, it is possible to form the identification mark 16 without the need for a dedicated tool or process when forming the counter sink portion 14, and to form a recess ( Since the identification mark 16 can be formed by drawing the metal material into the (groove portion) 26b, the identification mark 16 can be recessed without damaging the inner and outer surfaces of the can lid.
[0023]
In particular, the molding method of the present embodiment, the can lid 1, at a slightly spacing the countersink portion 14 and bead portion 15 is an annular projection for reinforcement is formed, such a can end 1 Before forming the counter sink part 14, the bead part 15 is formed by the engagement of the convex part 26a on the punch core 26 side and the concave part 25a on the panel foam ring 25 side.
[0024]
Thereby, the drawing of the metal material into the concave portion (groove portion) 26b of the punch core 26 when the identification mark 16 is provided is already started when the bead portion 15 is molded, and when the counter sink portion 14 is molded, the bead portion 15 so that the groove bottom of the identification mark 16 continues linearly, so that the identification mark 16 is effectively formed by pulling in the metal material, and is formed on the inner and outer surfaces of the can lid when the identification mark 16 is formed. It is possible to more effectively prevent damage.
[0025]
【The invention's effect】
According to the method for forming a can lid with an identification mark according to the present invention as described above, the identification mark for identifying a manufacturing factory, a production line, or the like is not conspicuous and is confirmed at a glance from above. together can be shaped to allow, without requiring special equipment or processes, and without such damage the inner and outer surfaces of the can lid, can be subjected to identification marks on the can lid and Do I The identification mark can be more effectively formed.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing an example of a can lid with an identification mark formed by the method of the present invention.
2A is a top view of the can lid shown in FIG. 1, FIG. 2B is a longitudinal sectional view taken along line BB in FIG. A, and FIG. 2C is a longitudinal section taken along line CC in FIG. Plan view.
FIG. 3 is a longitudinal cross-sectional view showing the bead portion of the can lid shown in FIG. 1 in a state before (A) the bead portion is formed and (B) a state when the bead portion is formed. Figure.
4 is a longitudinal cross-sectional view showing (A) a portion where an identification mark is not formed and (B) a portion where an identification mark is formed, for forming a counter sink portion of the can lid shown in FIG. 1;
[Explanation of symbols]
1 Can lid 11 Panel part 12 Chuck wall part 13 Flange curl part 14 Counter sink part (annular groove for reinforcement)
15 Bead part (annular protrusion for reinforcement)
16 Identification mark 26 Punch core (mold part that presses the panel)
26b Groove-shaped recess (at the corner of the punch core)

Claims (1)

From the state where the inverted conical cylindrical chuck wall part and flange curl part are formed outside the substantially disk-shaped panel part, the panel part and chuck wall part are pressed by pressing the panel part toward the top surface of the can lid. A panel sandwiched between both mold parts for a mold part that presses the panel part and a mold part that receives the pressing force through the panel part when forming the counter sink part between them An annular convex part is formed on one of the opposing surfaces of both mold parts and an annular concave part is formed on the other so as to bite the peripheral part of the part, and the corner of the mold part that presses the panel part. Before forming the countersink part, mold parts are formed by forming a groove-like concave part that cuts out the corner part at a desired position in the circumferential direction of the part. Reinforcement by biting After molding the card part, when molding the counter sink part, the metal material of the can lid is drawn into the recesses cut out at the corners of the mold parts. A method for forming a can lid with an identification mark, characterized in that an identification mark is formed by unevenness on a metal surface at a desired position in a circumferential direction .

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