WO1999016676A1 - Couvercle de boite metal facile a ouvrir, a excellente faculte d'ouverture, et procede d'elaboration - Google Patents
Couvercle de boite metal facile a ouvrir, a excellente faculte d'ouverture, et procede d'elaboration Download PDFInfo
- Publication number
- WO1999016676A1 WO1999016676A1 PCT/JP1998/004418 JP9804418W WO9916676A1 WO 1999016676 A1 WO1999016676 A1 WO 1999016676A1 JP 9804418 W JP9804418 W JP 9804418W WO 9916676 A1 WO9916676 A1 WO 9916676A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lid
- opening
- die
- easy
- punch
- Prior art date
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Classifications
-
- 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
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
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- 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
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
- B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
- B65D17/4012—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening partially by means of a tearing tab
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- 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
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
- B65D17/404—Details of the lines of weakness
Definitions
- the present invention relates to a metal container lid, particularly a metal plate easy-open lid which can be easily opened manually or partially or almost entirely, and a method for molding the same. Used for food cans and other wide applications.
- the easy-open can lid used for beverage cans and general food cans is made of painted aluminum plate or steel plate.
- An opening guide line is provided in a part of the lid to form the opening for taking out the contents when the lid is broken.
- a lid member 1 is formed into a basic lid shape, and then placed on a flat die 2, and a die 3 having a convex portion in the opening contour shape is formed. Is pressed to form an open guide groove (score) 4 in the material.
- the score depth In order to facilitate the openability, it is necessary to press the score depth to reach about 1/2 to 2/3 of the plate thickness before processing, but if the score depth is too shallow, open the can If it is too deep or too deep, there is insufficient strength and there is a transportation problem that the can is opened with a small external impact. For this reason, high accuracy is required for the convex portion of the score forming die, such as the height of the convex portion and the shape of the tip angle of the convex portion.
- the opening guide groove of the easy-open can lid which has been put into practical use, uses a scoring blade with a sharp cross section. Also in the push button type, the cutting of the opening piece uses a sharp shearing blade, and there is a problem in productivity in terms of tool life. Also, especially when the material is steel plate, repair painting is necessary because the surface coating is destroyed by processing and the metal is exposed. Regarding recycling, so-called “monometallic cans” can be said to be products that are suitable for recycling because metal cans and can lids are made of the same material in metal cans.
- easy-open can lids are mostly made of aluminum. On the other hand, most of the can lids except for the can body and the easy-open can lid are made of steel plate. For this reason, there is a strong need for a method that can produce easily opened steel plate can lids with excellent openability and corrosion resistance with good productivity.
- the easy-open can lid that forms the opening guide groove by pressing the above-mentioned resin-laminated metal plate with the shoulder radius of the upper and lower molds aims to solve the above problems.
- practical problems remain in terms of openability and corrosion resistance.
- the method of pressing and forming the opening at the shoulders of the upper and lower molds to solve the change in the shape of the convex part of the mold due to wear during the formation of the score is also easy to open.
- the present invention is to improve the precision of the remaining thickness control when forming an opening guide line by press molding at a mold shoulder.
- a metal plate can lid having a resin film on at least one surface, which has an outer peripheral flat portion and an inner peripheral flat portion with an opening guide line interposed therebetween.
- An outer bead and an inner bead are provided on the side opposite to the opening guide line of the outer peripheral flat portion and the inner peripheral flat portion, respectively, and the opening guide line is gentle from the respective plate thicknesses of the outer peripheral flat portion and the inner peripheral flat portion.
- the easy-opening lid having excellent can-opening properties can be configured so that the gently thinned thin-walled portion has a bent cross-sectional shape.
- at least the inner bead has a convex shape on the outer surface side of the can, and the outer surface of the inner bead portion closest to the inner surface of the can has the inner bead outermost surface portion of the inner bead. It is located on the inner side of the can within a range of 0.2 to 4.0 mm compared to the convex surface, and the outer peripheral flat part is the inner peripheral flat part at the boundary with the opening guide line.
- the outermost surface of the can is 0.1 to 2.Omm from the outer surface of the can to the outer surface of the can, and the width of the inner flat section and the outer flat section is 0.1 to 3.0 mm, respectively. And an easy-opening lid having excellent can-opening property.
- the metal plate can be formed of a steel plate, a surface-treated steel plate, an aluminum plate or an aluminum alloy plate, and at least the resin film on the metal plate surface on the inner side of the can is heated.
- One resin film can be a poly- amide resin having a thickness of 10 to 100 m.
- the easy-open can lid according to the present invention can be opened with a handle with part or all of the can lid separated from the can body, or with a handle with part or all of the can lid left on the can body.
- the opening piece provided in at least one place of the can lid without a handle may be partially left in the can body or separated from the can body. Can be opened in an open style.
- the punch shoulder R or at least one of the die shoulders R is not more than 2.Omm, and the punch and die are pressed and formed using upper and lower dies that overlap on the parallel movement of the punch.
- the depth of the concave portion of the lower die (die) is (punch shoulder R + die shoulder R) X 4 or less, and the depth of the concave portion of the upper die (punch) head is less. It is 0.2nim or more.
- the molding material is restrained by the lower mold (die) and / or the upper mold (punch).
- the shape of the shoulder of the die and punch is set using a part of an ellipse with a major radius of 0.1 to 5.0 mm and a minor radius of 0.05 to 4.0 mm.
- the present invention provides a method of forming an easily openable lid with excellent openability, which is formed by press working using upper and lower dies, which overlap on a parallel line of movement of the punch.
- the depth of the concave portion of the lower die (die) is (punch shoulder R + die shoulder R) X 4 or less, and the upper die (punch)
- the recess depth is 0.2 or more recommended.
- FIG. 1 is a view showing a conventional can lid manufacturing method using a flat mold and a V-shaped cross section guide groove.
- FIG. 2 is a diagram showing a method of press-forming the shape of the opening at the shoulders of the conventional upper and lower molds.
- FIG. 3 is a cross-sectional view near the opening guide line of the present invention.
- FIG. 4 is a diagram showing an example of the easy-open lid according to the present invention.
- FIG. 5 is a cross-sectional view near the opening guide line according to the first embodiment of the present invention.
- FIGS. 6A and 6B are cross-sectional views near the opening guide line according to the second embodiment of the present invention.
- 7 (A), 7 (B) and 7 (C) are cross-sectional views of the vicinity of the opening guide line and the bent portion of the thin molded portion according to the second embodiment of the present invention.
- FIG. 8 is a view showing an example of the easily-openable lid according to the second embodiment of the present invention.
- FIG. 9 is a view showing a method for manufacturing a can lid according to the third embodiment of the present invention.
- FIGS. 10 (A), (B), (C) and (D) are views showing a typical easy-open can lid according to the first embodiment of the present invention.
- FIGS. 11 (A), (B), (C), (D) and (E) are cross-sectional views showing the vicinity of the opening guide line according to the first embodiment of the present invention.
- FIGS. 12 (A), (B), (C) and (D) show a typical easy-open can lid according to the second embodiment of the present invention.
- FIGS. 13 (A), (B), (C), (D) and (E) are views showing the cross-sectional shape near the opening guide line according to the second embodiment of the present invention.
- FIG. 14 is a diagram showing an external view of a typical can lid manufactured according to the third embodiment of the present invention.
- FIG. 15 is a diagram showing the effect of the depth of the concave portion of the punch head on the remaining thickness variation in the example.
- FIG. 16 is a diagram showing the influence of the depth of the concave portion at the center of the die on the variation in the remaining thickness in the example.
- the cross-sectional shape near the opening guide line 12 has an outer flat portion and an inner flat portion between the outer bead 13 and the inner bead 16, and further has an outer flat portion 14 as shown in FIG.
- This cross-sectional shape is not necessarily required over the entire circumference of the opening guide line 12, and it is sufficient that 30% or more of the opening guide line 12 has this shape. Also, due to the relationship with the position of the opening, it can be used as a counter sink or a winding part, instead of an outside bead.
- the flat portions 14 and 15 are referred to as flat portions including a portion having a radius of curvature of 50 mm or more.
- the flat part length refers to the width of the part having a radius of curvature of 50 or more.
- the present invention has a smoothly thinned opening guide line 12 because, in the pressing processing of the sharp blade according to the prior art, the resin film is broken, so that repair coating is required. It is.
- the term “smoothly thin” means that the plate thickness has a rate of change of 1000 mZ or less in a small portion where the plate thickness changes. More preferably, a range of 250 to 750 / m / mm is desirable.
- the thickness be 750 mZmm or less in order to secure the integrity of the film because the resin film will be defective or the film will have poor adhesion. If the thickness is less than 250 m / mm, the part to be processed to reduce the thickness of the sheet becomes too long, so that the area where the adhesion of the film is reduced becomes wider and the thickness decreases too slowly. It becomes difficult to concentrate stress when opening the can, and there is a concern about the ability to open the can. For this reason, a range of 250 to 750 ⁇ m / mm is desirable.
- Such a smoothly thinned opening guide line 12 can be formed by pressing with the shoulders of the upper and lower molds.
- the thickness of the metal plate is reduced by pressing the metal plate with the shoulder radius of the upper and lower molds, and then the metal plate is further pressed back.
- the openability is improved, but if the thin-walled portion is formed into a V-shape by push-back processing, The problem remains that the adhesion of the resin film is apt to decrease, and it is necessary to take careful control to prevent corrosion and eruption.
- the outer flat portion 14 and the opening portion where the opening guide line 12 remains as a can lid are provided. This was formed so as to be between the inner peripheral flat portions 15 to secure the adhesion of the resin film near the opening guide line 12. Further, beads 13 and 16 were provided outside the outer peripheral flat portion 14 and inside the inner peripheral flat portion 15. This makes it easier for stress to concentrate on the opening guide line 12 when a stress for opening the can is given.
- the V-shaped groove is formed by the pressing of the sharp blade of the prior art, and the can is opened by shearing force.
- the can is opened by breaking the metal plate with tension.
- the cans are opened This is because the stress for the purpose can be effectively used to cause the opening guide line 12 to break in tension.
- the tab is caused to break part of the opening (initial break), and further causing the opening to fully open.
- the initial fracture is hard to occur, and if the stroke of the tab is consumed in the initial fracture, there is no longer the tab stroke until it reaches the fully opened state, and there is a problem that the half-opening stops.
- the tab stroke is consumed in changing the V-shaped or S-shaped shape. There are cases.
- the tab stroke can be effectively used by arranging the opening guide line 12 between the inner and outer beads and performing only processing to make the vicinity of the opening inner line 12 gently thin.
- wi and wo are less than 0.1 mm, the adhesion of the film to the opening guide wire portion is reduced, which may cause a problem in corrosion resistance. If it is more than 3.0 mm, the distance between the bead and the opening guide line is too large, which may cause a problem in opening the can. For this reason, it is desirable that wi and wo be in the range of 0.1 to 3.0 mm.
- hi is less than 0.2 mm, the rigidity of the opening piece becomes small, and the pushing force of the tab at the time of opening the can tends to be not effectively used, which is not preferable.
- ho is less than 0.1 mm, the vector of the force required to cause an initial tensile fracture is not preferable. If ho is greater than 2. Omm, it is not preferable because the lid between the upper and lower lids will cause scratches when the easy-open lids are transported in piles. Also, if hi is more than 4.0nim, it is not preferable for transportation.
- the above shape can be applied to other types of easy-open can lids such as a pull-tab system, a full-open system, and a push-down system.
- h B is less than 0.2 mm, the rigidity of the lid body side becomes small, and the pushing force of the tab at the time of opening the can tends to be not effectively used, which is not preferable. Also, when h B. Is more than 3.0 mm, it is not preferable because the lid between the upper and lower sides causes scratches when the easy-open lid is transported in a pile.
- the steel sheet used in the present invention usually has a thickness t. : In the range of 0.080 ⁇ 0.280Mm, hardness (H E 3 T.) 46 ⁇ 68 , elongation: is used having the mechanical properties of 10 to 60%.
- TFS Tin Free St eel
- the aluminum plate used in the present invention usually has a thickness t. : It is in the range of 0.18 to 0.32 mm.
- the alloy composition is preferably 5052, 5082, 5182, 5352, 5349, 5017, and H19 is preferable for refining.
- a surface-treated metal plate obtained by subjecting the aluminum plate to a chromate treatment, a zirconate treatment, or a monochromic phosphate chemical conversion treatment can also be used.
- a resin film is required on both sides of the metal plate to ensure corrosion and heat resistance.
- At least the laminated resin on the inner surface side of the can is preferably a 10 to 100 ⁇ saturated polyester resin film in terms of economy, corrosion resistance, and flavor.
- the saturated polyester resin is a linear thermoplastic polyester obtained by polycondensation of a dicarboxylic acid and a diol, and is represented by polyethylene terephthalate.
- the dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, 2,6-naphthalenedicarboxylic acid, decandicarboxylic acid, dodecanedicarboxylic acid, cyclohexane Hexanedicarboxylic acid, etc., alone or as a mixture
- the diol component is ethylene glycol, butanediol, decanediol, hexanediol, cyclohexanediol, neopentyl glycol, etc., or a mixture thereof. It is. It may be a copolymer of two or more dicarboxylic acid components / diol components,
- the resin film on the outer surface is desirably made of polyamide resin from the viewpoint of the winding property.
- the polyamide resin is a single or a mixture of nylon 6, nylon 12, nylon 5, nylon 11, and the like.
- a plasticizer, an antioxidant, a heat stabilizer, an inorganic particle, a pigment, an organic lubricant, etc. may be added to the metal plate resin film used in the present invention, if necessary. Incorporation of additives is performed.
- the thickness of the resin film in the unprocessed portion on the metal plate used in the present invention is desirably 10 to 100 m.
- the present invention has an opening guide line in which a metal plate is gently thinned by a process such as a pressing process using upper and lower dies. Since the resin film is thinly formed together with the metal plate, if the resin thickness is less than 10 zm, the barrier properties (corrosion resistance and corrosion resistance) of the resin film, particularly in the machined part, are not ensured. If it exceeds 00 m, the effect on the barrier property of the resin film is saturated, which is economically disadvantageous. Stability of performance ⁇ Considering economics, etc., the range of 16 to 60; / m is particularly effective. The thickness of the metal plate in the area of the opening guide line is both for ensuring openness and ensuring drop strength.
- the thickness of the metal plate when the thickness of the metal plate is large, the openability decreases, and when it is thin, the drop strength decreases.
- the thickness in the case of a steel plate, it is 10 to 75 m, and in the case of A range of 130 m is desirable. More preferably, the thickness is in the range of 20 to 60 m for steel plates and 35 to 125 m for aluminum plates.
- the resin film having the above properties is uniformly stretched together with the base material, and according to the method of the present invention, the resin film is extruded or pushed back by shoulder portions having mutually smooth smooth curved surfaces. Since the process is based on press working, there is no tool life problem seen in the pressing method of the sharp edge, excellent productivity is guaranteed, and an easy-open can lid is obtained.
- the cross-sectional shape near the opening guide line (bent portion) 12 is flattened between the outer bead 13 and the inner bead 16.
- Part 14 and the inner flat part 15 A metal having both openability and corrosion resistance by having an open guide line 12 that is smoothly thinned between the outer flat portion 14 and the inner flat portion 15 and has a bent cross-sectional shape. It is an easy-open can-open lid made of plate with no inner and outer surfaces.
- This cross-sectional shape is not necessarily required over the entire circumference of the opening guide line 12, and it is sufficient that 30% or more of the opening guide line 12 has this shape. Also, due to the relationship with the position of the opening, the counter bead sink and the tightening portion can be used in place of the outer bead 13.
- the flat portions 14 and 15 are referred to as flat portions including a portion having a radius of curvature of 50 mm or more.
- the flat part length refers to the width of the part having a radius of curvature of 50 mm or more.
- the present invention requires a smooth coating because a conventional coating of a sharp blade requires a repair coating because the resin film is broken and a repair coating is required. It has a guide line 12.
- the term “smoothly thin” means that the sheet thickness has a rate of change of l OOO / z m Z mm or less in a small portion where the sheet thickness changes. More preferably, it is in the range of 250-750 ⁇ m / mm.
- 750 / mZmin or less In order to stably maintain the soundness of the film, it is desirable to use 750 / mZmin or less. If the thickness is less than 250 mZmm, the part to be processed to reduce the thickness becomes too long, so that the part where the adhesion of the film is reduced becomes wider and the thickness decreases too slowly. It becomes difficult to concentrate stress when opening the can, and there is a concern about the ability to open the can. For this reason, a range of 250 to 750 m / mm is desirable. Such a smoothly thin opening guide line can be formed by pressing with the shoulders of the upper and lower molds.
- Opening of a V-shaped groove formed by pressing a sharp blade the can is opened by shearing force.
- the can is opened by breaking the metal plate in tension. Providing both beads can effectively utilize the stress for opening the can to cause the opening guide line to break in tension, and can improve the opening property.
- the thinned portion has a bent cross-sectional shape, the bent shape facilitates the concentration of stress for opening the can, which can further improve the openability.
- the bending angle is in the range of 20 ° to 90 °.
- the temperature exceeds 90 °, the adhesion of the resin film decreases due to the formation of a thinner wall, and the adhesion of the resin film further decreases due to bending, and it is necessary to perform detailed management to prevent corrosion and cracking. It is. If the temperature is less than 20 °, the degree of improvement in can openability is small.
- the angle 19 of the bent portion can be obtained as the angle at which the center line 18 of the base material on both sides of the bent portion intersects as shown in FIG. 7 (B).
- FIG. 7 (C) Next, an example of how to draw the center line will be described with reference to FIG. 7 (C).
- a vertex is determined at the bent portion 12.
- the minimum radius of curvature of the metal plate surface on the inner surface of the can at the bend 12 is G i
- the minimum radius of curvature of the metal plate surface on the outer surface of the can is G o
- a center line 18 is defined as a straight line passing through vertex C and midpoint M of line segment X i _X o.
- the center line between the vertices is a straight line connecting the vertices.
- the inner bead 16 and the outer bead 13 are convex on the outer surface side of the can as shown in FIG. 7 (A).
- wi and wo are less than 0.1 mm, the adhesion of the film to the opening guide wire 12 will be reduced, which may cause a problem in corrosion resistance. If it exceeds 3.0 mm, the distance between the bead and the opening extension 12 will be too large, which may cause a problem in opening the can. For this reason, it is desirable that wi and wo be in the range of 0.1 to 3.0 mm.
- h i is less than 0.2 mm, the rigidity of the opening piece becomes small, and the pushing force of the tab at the time of opening the can tends to be not effectively used, which is not preferable. If ho is less than 0. limn, it is not preferable because the vector of force required to cause an initial tensile fracture is shifted.
- ho is more than 2.0 mm, it is not preferable because the lid between the upper and lower sides causes scratches when the easy-open can lid is stacked and transported. Also, even if hi is more than 4.0 mm, it is not preferable for transportation.
- the height and length were calculated using the method shown in Fig. 7 (A) with the panel part of the lid body as the horizontal reference.
- the outer bead 13 may be convex in the can.
- the above shape can be applied to other types of easy-open can lids such as a pull-tab system, a full-open system, and a push-down system.
- h B is less than 0.2 mm, the rigidity of the lid body side becomes small, and the pushing force of the tab at the time of opening the can tends to be not effectively used, which is not preferable. Also, h B is the lid not rather be preferred for the this cause rubbing flaws in each other between the upper and lower in the case of transport by overlapping YasuHiraki can lid at 3.0mm greater.
- the steel plate, aluminum plate, polyester resin, polyamide resin, resin film and processing method used in the present invention are described in the aforementioned book. It is the same as the first aspect of the invention.
- the present inventors have found that when press-forming the opening shape at the upper and lower mold shoulders, the remainder of the material generated inside the opening guide line of the material when pressed by the mold shoulders is uniformly reduced. It was found that the inability to absorb was the cause of non-uniform residual thickness. One reason for this is considered to be that the material inside the opening guide line at the time of pressing is not restrained by the mold, and free deformation is allowed.
- the space (recess) 20 formed on the same side as 6 and 7 regulates and restrains the space where the material escapes.
- a punch shoulder R and a die shoulder R are formed.
- the major radius of the ellipse forming a part of the shoulder shape of the punch and the die should be 0.1 limn or more. 5.0 mm or less and the short radius must be 0.05 mm or more and 4.0 mm or less.
- the major axis of the ellipse that forms part of the shoulder shape of the punch and die is greater than 5. Omm or the minor axis is greater than 4.0 mm, the opening guide line becomes thicker, dispersing the concentration of stress on the opening guide line and opening it. This is for reducing the can property.
- the resin material will be reduced when a metal sheet with a resin film laminated on the lid material is used. This is because film integrity cannot be maintained.
- a recess is formed in the punch head to allow the excess material to escape inside the opening guide line by pressing, but this depth shall be 0.2 mm or more.
- the depth of the recess at the center of the die shall be (punch shoulder major radius + die shoulder major radius) X 4 or less. These values are important for controlling the escape of the material, and in particular, the depth of the recess at the center of the die must be controlled so that the bottom of the recess contacts the material during processing. This critical depth depends on the amount of press working, and can be roughly estimated as follows. In other words, the length of the opening guide line becomes longer by approximately (the major radius of the punch shoulder + the major radius of the die shoulder) in the vertical direction due to the reduction in the thickness of the sheet when pressed by the punch and the die shoulder.
- the overlap width between the punch and the die on the parallel line of operation of the punch shall be less than the major radius of the punch shoulder + the major radius of the die shoulder. This is to form a cross section of the opening guide line with good openability. If there is no overlapping width, it will be sheared, and it will be difficult to form an ultra-thin portion without breaking, and the width will be small. If it is too wide, the opening guide line becomes thicker, dispersing the concentration of stress on the opening guide line and lowering the openability. Due to the ductility of the material, to avoid the risk of material breakage due to shear deformation, it is preferable to set the overlap width to (the major radius of the punch shoulder + the major radius of the die shoulder) / 2 or more.
- the width of the flat part from the punch shoulder to the punch head recess is a force that changes over the entire circumference of the opening guide line ⁇ , and the maximum width can be set to 6.Omm or less. I like it. This is to make it easy for excess material to escape into the punch head recess. In order to restrict the escape to the punch concave part of the excess material to some extent, it is preferable that the maximum width of the flat part is 0.5 nun or more.
- the material of the opening lid to which the present invention is applied is not limited. Instead, the effects can be obtained with aluminum alloy plates, steel plates, and plate materials obtained by subjecting these to surface treatment, or by laminating resin films. Example
- Table I-1 shows the type of easy-open can lid (see Fig. 10), cross-sectional shape (see Fig. 11), material, thickness of the thinnest part of the metal plate in the opening guide, material, resin film, and performance evaluation results. .
- Fig. 10 shows a sion-tab type easy-open lid, (B) shows a pull-tab type easy-open lid, (C) shows a tab-free type easy-open lid, and (D) shows a full-open type easy-open lid.
- FIGS. 11 (A) and (B) are cross-sectional views near the opening guide line of the present invention
- FIGS. 11 (C), (D) and (E) are cross-sectional views near the opening guide line of the comparative example.
- the corrosion resistance of the inner surface of the can was evaluated by filling the contents with hydrochloric acid + an aqueous solution of iron chloride (75 cc hydrochloric acid + 150 g FeCl 2 + 1925 cc water) and storing at 50 ° C for 1 month. It was visually observed and evaluated.
- the outer surface of the can was immersed in tap water at room temperature for one month, and the occurrence of ⁇ was visually observed and evaluated.
- the openability was determined as to whether or not the can was fully opened without any problems, and the openability was measured to determine the quality of the openability.
- For the drop strength create a can with an easy-open can lid filled with the contents and drop it vertically 5 times from a height of 60 cm. Observed at 50 and evaluated. ⁇ ⁇ ⁇ X was evaluated as shown in Table I-11.
- Fig. 10 (A) Stay-on tab type easy-open lid, (B) Pull-tab type easy-open lid, (D) Full-open type easy-open lid No tab: Fig. 10 (C) Tab-less type easy-open lid Can lid
- TFS Cook W-treatment Sl plate ET: Electroplated I-plated steel plate CL: Ni base thin Sn-plated steel plate 1): Shown in terms of zirconium. 2): The amount of oxidized Cr indicates the amount as Cr. Corrosion resistance ⁇ : Extremely o-.m
- Table 1 shows the types of easy-open can lids (see Fig. 12), cross-sectional shapes (see Fig. 13), materials, the thickness of the metal at the opening guide, the thickness of the thinnest part, the material, the resin film, and the performance evaluation results. .
- Fig. 12 shows a sion-tab type easy-open lid, (B) shows a pull-tab type easy-open lid, (C) shows a tab-free type easy-open lid, and (D) shows a full-open type easy-open lid.
- FIGS. 13 (A) and (B) are cross-sectional views near the opening guide line of the embodiment
- (C), (D) and (E) are cross-sectional views near the opening guide line of the comparative example.
- corrosion resistance, openability, and drop strength were investigated.
- the corrosion resistance of the inner surface of the can was evaluated by filling the contents with hydrochloric acid + iron chloride aqueous solution (75 cc hydrochloric acid + 150 g FeCl 2 + 1925 cc water), storing at 50 ° C for 1 month, and visually observing And evaluated.
- TFS G D G W G-plate ET: Electroplated steel plate CL: Ni base thin Sn coated plate 1): Shown as zirconium conversion value. 2): Hydrated oxidized Cr amount indicates the amount as Cr. ⁇ : Extremely new
- TFS Cu Di ⁇ n mate paste ET: Plated steel sheet CL: Ni base thin Sn plated steel sheet 1): Shown as zirconium conversion value. 2): Hydrated oxidized Cr amount indicates the amount as Cr.
- Corrosion-resistant basket ⁇ extremely 3 ⁇ 4ff. : Satoshi
- the material of the opening lid used is a laminated steel sheet in which a resin film is laminated on a surface-treated steel sheet.
- An open lid was prepared from the surface-treated steel sheet by the above-described pressing.
- Table IE-1 shows the shape of the mold to be used when the target residual thickness was set to 40 / m, the shape of the opened can lid, and the evaluation results.
- the thickness variation of the thinnest part was measured by observing the section thickness at eight points A, B, C, D, E, F, G, and H along the opening guide line 22 shown in Fig. 14. The thickness was determined as the difference between the maximum and minimum values.
- the evaluation of characteristics as can lid 23 was conducted by examining the soundness, openability and drop strength of the film.o
- the soundness of the film was evaluated by conducting tests.
- the openability was determined as to whether or not it could be fully opened without any problems, and the openability was measured to determine the quality of the openability.
- For the drop strength a can with an easy-open can lid filled with contents was prepared, dropped five times vertically from a height of 60 cm, and the state of leakage of the contents from the easy-open can lid due to a drop impact was observed.
- Fig. 15 and Fig. 16 show the results of the examination of the residual thickness variation under various conditions, organized by the depth of the recess at the punch head and the depth of the recess at the center of the die Z (punch shoulder R + die shoulder R). is there. From this result, the above-mentioned concept of limiting the numerical value of the depth of the concave portion was confirmed.
- a can open lid was formed by pressing a laminated steel sheet in which a resin film was laminated on a surface-treated steel sheet.
- Table II-2 shows the shape of the mold to be used when the target residual thickness was set to 40 / m, the shape of the can open lid that was created, and the evaluation results.
- the “*” in the “Die recess depth” column indicates that the material is not in contact with the die center recess bottom inside the opening guide line.
- Negative values in the “Overlap of upper and lower dies” column indicate that punching force ⁇ does not overlap the die due to the operation.
- Ra is long.
- the easy-opening lid according to the present invention uses a material obtained by laminating a resin film on a metal plate, and uses an opening guide wire that has been processed by pressing without using a sharp blade.
- a specific shape in the vicinity thereof it becomes possible to have both the openability and the corrosion resistance, which are problems of the prior art.
- steel easy-open can lids are put into practical use, it will be possible to turn them into ⁇ monometallic cans '', and provide the market with products suitable for recycling in response to recent global environmental issues. It is possible to do so.
- the steel sheet itself is excellent in economic efficiency, and it is expected that making the can body and can lid made of steel sheet will make the product more economical and easy to reuse as a resource. You.
- the method for forming a can lid according to the present invention provides a method for forming an opening guide line by pressing to avoid the problem of the life of a machining tool, which is a major problem of the prior art. Lids with extremely small variations and satisfying the characteristics as can lids can be manufactured with high productivity
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/509,586 US6427860B1 (en) | 1997-09-30 | 1998-09-30 | Easy-open can lid superior in can openability and process for production thereof |
DE69838853T DE69838853T2 (de) | 1997-09-30 | 1998-09-30 | Leicht und vorzüglich zu öffnender dosendeckel sowie verfahren zu seiner herstellung |
EP98945548A EP1044886B1 (en) | 1997-09-30 | 1998-09-30 | Easily openable can lid with excellent openability and method of forming same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9267517A JPH11105867A (ja) | 1997-09-30 | 1997-09-30 | 開缶性及び耐食性に優れた樹脂被覆金属板製内外面無補修型易開缶蓋 |
JP9/267517 | 1997-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999016676A1 true WO1999016676A1 (fr) | 1999-04-08 |
Family
ID=17445947
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/004418 WO1999016676A1 (fr) | 1997-09-30 | 1998-09-30 | Couvercle de boite metal facile a ouvrir, a excellente faculte d'ouverture, et procede d'elaboration |
Country Status (5)
Country | Link |
---|---|
US (1) | US6427860B1 (ja) |
EP (1) | EP1044886B1 (ja) |
JP (1) | JPH11105867A (ja) |
DE (1) | DE69838853T2 (ja) |
WO (1) | WO1999016676A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1046589A2 (en) * | 1999-04-20 | 2000-10-25 | Nkk Corporation | Easy opening can end and method for fabricating the same |
WO2016177754A1 (de) * | 2015-05-07 | 2016-11-10 | Ball Europe Gmbh | Deckel für eine getränkedose |
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EP1651360A1 (en) * | 2003-07-28 | 2006-05-03 | Valspar Sourcing, Inc. | Metal containers having an easily openable end and method of manufacturing the same |
US8122747B2 (en) | 2008-06-03 | 2012-02-28 | Stolle Machinery Company, Llc | Can end scoring method, and tooling assembly and conversion press therefor |
US20100213194A1 (en) * | 2009-02-21 | 2010-08-26 | Junsong Liu | Pop Can Beak Spout Design |
USD638704S1 (en) | 2010-12-10 | 2011-05-31 | Pactiv Corporation | Container lid |
USD637489S1 (en) | 2010-12-10 | 2011-05-10 | Pactiv Corporation | Pull grip feature of a container lid |
EP2599844A1 (en) * | 2011-12-02 | 2013-06-05 | PPG Industries Ohio Inc. | Coating composition for a food or beverage can |
US9694935B2 (en) * | 2013-03-15 | 2017-07-04 | Ball Corporation | End closure with a ring pull actuated secondary vent |
BR112016016030B1 (pt) * | 2014-01-08 | 2022-11-29 | International Patents And Brands Corporation | Tampa para um recipiente de substâncias e recipiente de substâncias compreendendo a tampa |
US9714115B2 (en) | 2014-07-30 | 2017-07-25 | Ball Corporation | Vented container end closure |
ES2786187T3 (es) | 2014-12-01 | 2020-10-09 | Ardagh Mp Group Netherlands Bv | Cierre para un contenedor y un contenedor provisto con el mismo |
US20190351473A1 (en) * | 2018-05-15 | 2019-11-21 | Stolle Machinery Company, Llc | Method and apparatus for forming a can shell using a draw-stretch process |
WO2020017466A1 (ja) * | 2018-07-20 | 2020-01-23 | 大和製罐株式会社 | 缶蓋 |
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1998
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- 1998-09-30 WO PCT/JP1998/004418 patent/WO1999016676A1/ja active IP Right Grant
- 1998-09-30 DE DE69838853T patent/DE69838853T2/de not_active Expired - Lifetime
- 1998-09-30 EP EP98945548A patent/EP1044886B1/en not_active Expired - Lifetime
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1046589A2 (en) * | 1999-04-20 | 2000-10-25 | Nkk Corporation | Easy opening can end and method for fabricating the same |
EP1046589A3 (en) * | 1999-04-20 | 2001-05-30 | Nkk Corporation | Easy opening can end and method for fabricating the same |
US6435368B1 (en) | 1999-04-20 | 2002-08-20 | Nkk Corporation | Easy opening can end and method for fabricating the same |
WO2016177754A1 (de) * | 2015-05-07 | 2016-11-10 | Ball Europe Gmbh | Deckel für eine getränkedose |
CN108473230A (zh) * | 2015-05-07 | 2018-08-31 | 球形饮料包装欧洲有限公司 | 用于饮料罐的盖 |
US10450103B2 (en) | 2015-05-07 | 2019-10-22 | Imv Innovation Marketing Und Vertriebs Gmbh | Lid for a beverage can |
CN108473230B (zh) * | 2015-05-07 | 2019-11-12 | Imv创新营销与销售有限公司 | 用于饮料罐的盖 |
Also Published As
Publication number | Publication date |
---|---|
DE69838853D1 (de) | 2008-01-24 |
EP1044886A4 (en) | 2001-03-07 |
JPH11105867A (ja) | 1999-04-20 |
EP1044886A1 (en) | 2000-10-18 |
DE69838853T2 (de) | 2008-12-04 |
US6427860B1 (en) | 2002-08-06 |
EP1044886B1 (en) | 2007-12-12 |
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