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

Definitions

• the present invention relates to a method for forming a tear portion in a container lid.
• the present invention relates to a method for forming a rupture portion of a container lid that is opened by tearing an opening piece by a tab along a rupture guide line formed on a metal material plate.
• Container lids that are opened using taps have been used for soft drink cans, etc., but recently ⁇ has been widely used for cans and other food cans that are fully ovend. .
• Such a can lid that is opened using a tab is characterized by its simplicity and safety as compared with the conventional means of opening using a can opener. It has been pointed out that there is a danger that the finger or hand may be damaged at the time of opening or after the sharp opening left by tearing the cleavage guide line in the ⁇ part.
• Inventions such as 4 7 — 4 4 0 7 7 (Title of Invention: Metal lid and manufacturing method thereof) and Japanese Patent Application No. 59-609 9 3 (Title of Invention: Safety container with opening ⁇ ) developed Have been.
• the invention of the present application was developed as a method of forming the tearing part of the latter “safety of one edge of the opening—container lid”, but depending on the method of use, the opening remaining on the can body side after opening.
• Edge safety 3 ⁇ 4It can be applied to the formation of tears in the container.
• the popping force which is the force required for tearing when the tab is raised
• Value and the turf value which is the force required during the progression of the subsequent tearing, are large, and the opening piece tears sharply when the tab is pulled strongly. The cause was ⁇ increase '.
• the material plate is formed by shallow drawing 1 ?, and the wall formed by the shallow drawing ?? Patent No. which is a method of forming guide lines
• the invention of 1 0 6 2 7 4 1 (Title of Invention: Method of forming opening piece in canister!) Exists as the prior art. According to the method of forming the cleavage guide line, it is difficult to stably form a weakened cleavage guide line as in a tin plate. It has the advantage that it can be formed stably with the line.
• the invention of the present application utilizes the above-described method for forming a special cleavage guide line in the process as a result, thereby stably forming a better cleavage guide line, and forming a cleavage portion after the cleavage. Try to eat directly from the person who opens, More safe It was created for the purpose of forming a cleft.
• the method for forming the tearing portion in the container lid of the present invention comprises the following three steps, and the basic concept of each step is shown in FIG. 1 to FIG.
• a D standing wall portion 2 is formed on the lid material plate 1 by drawing D processing. This squeezing])
• the processing is the same as that generally performed.]
• the lid material plate 1 is placed on the lower die 3 and the upper die By pressing down 4, the vertical wall 2 is formed at the clearance between the U-type molds 3 and 4.
• the rising portion 5 of the standing wall portion 2 formed in the first step is subjected to shallow drawing 5 processing.
• This shallow drawing is shallow drawing!
• the lower die 6 and the upper die 7 are slightly crossed, but the rising part 5 of the upright wall 2 is subjected to severe drawing and the two die 6 and 7 are clicked.
• a thin wall 'standing wall 8 is formed at the alance portion.
• the third step is to press down the board part 9 U which has been extruded by the drawing D processing of the first step.
• the lower surface of the board 10 on the side of the rising D part 5 of the standing wall 2 is supported by the lower die 11 and the board 9 extruded by the upper die 12 is pressed down. This is D line.
• the panel 9 is depressed in this manner, the upright wall 2 bends into an inverted V-shape or an inverted U-shape from its middle part 3 ⁇ 4 D, forming a raised wall 2 a protruding from the board 9. I do.
• the thin standing wall portion 8 formed in the second step by the press-down of the board surface portion 9 simultaneously buckles and bends.
• this part constitutes a cleavage plan extension 8a weakened by shearing force.
• the upright wall portion 2 is bent from the middle portion into an inverted V-shape or an inverted ⁇ shape, so that the tearing guide line 8a is located in close contact with the raised wall 2a even after tearing. Therefore, it is possible to prevent damage due to the rupture.
• FIGs. 5 to 8 show a state in which the cleaved portion formed by the method of the present invention is cleaved.
• the arrow indicates the direction of pushing or peeling of the opening pieces 20 and 21 when attached to the container as a container].
• the opening piece As can be seen in Figs. 5 and 6, the opening piece
• the opening edge 20a which is the 20 tearing point, is positioned in close contact with the raised wall 21, the damage caused by the opening edge 20a can be prevented.
• the cleaved portion 22 remaining on the container side is positioned in close contact with the raised wall 23, the opening on the container side can be constructed safely.
• the cleavage guide line 8a is formed on the rising D portion 5 of the raised wall 2a, and the raised wall 2a is subjected to drawing in the first step.
• the work is hardened as a whole due to the bending process in the process.
• the structure tends to cause stress concentration on the cleavage guide line at the time of cleavage. ing.
• the pop value and the tee value for tearing the formed container lid according to the method of the present invention are related to the method of forming the tear guide line 8a. Therefore, it is possible to keep the value very low.
• the present invention has the following advantages.
• the rupture guide line of the container lid is formed into a D-shape by buckling the thin wall, so that the weakened rupture guide line can be formed stably ⁇ > o
• a structure can be formed in which the cleavage guide line is formed at the rising D portion of the raised wall so that stress at the time of cleavage can be easily concentrated on the cleavage guide line. Accordingly, it is possible to keep the pop value and the tee value, which are the forces required to rupture the opening piece of the container lid, at extremely low values.
• the container lid formed according to the present invention has a ruptured portion that comes into close contact with the raised wall after opening, so that the person who opens the container does not injure his / her hands or fingers, and thus has a high degree of safety. It will be excellent.
• the blade type required for embossing is used to form the cleavage guide line. Another advantage is that the formation of a raised wall and the formation of a tearing guide line by buckling of a thin standing wall can be performed simultaneously in a single step without using a medium-sized die.
• FIGS. 1 to 4 are sectional views showing the basic concept of the method of the present invention divided into the steps in order, and FIGS. 5 to 8 show the method of the present invention! 9)
• FIGS. 9 to 12 are embodiments of the present invention.
• FIGS. 13 and 14 are cross-sectional views sequentially showing the process of forming a tear in the lid
• FIGS. 13 and 14 are enlarged views of the essential parts in FIGS. 11 and 12, respectively.
• FIG. 16 is a cross-sectional view showing the final step of the process of forming a tear in the container lid by using a die mold according to another embodiment of the present invention.
• FIG. 17 is a perspective view (including a partially broken section) of the molded container lid according to the embodiment.
• 1 is a lid material plate
• 2 is an upright wall
• 2a is a raised wall
• 3 is a lower die type
• 4 is an upper die type
• 5 is a riser!
• 6 is the lower die type
• 7 is the upper die type
• 8 is the thin vertical wall
• 8a is the cleavage guide line
• 9 is the panel surface
• 10 is the rising IT panel side
• 1 1 is a lower die type
• 1 2 is an upper die type
• 20 and 21 are open pieces
• 20 a is an open piece
• 22 is a tear
• 23 is a raised wall
• 30 30a is a rolled part
• 30b is a dish
• 31 is a lower die
• 32 is an upper die
• 33 is a lower die
• 3 4 is the upper die
• 35 is the center panel
• 36 is the standing wall
• 36 a is the rising!
• 37 is a lower die
• 38 is an upper die
• 39 is a thin wall
• 40 is a lower die
• 41 is an upper die
• 42 is a bump Wall
• 4 3 is the cleavage guide line
• 4 4 is the upper die type
• 4 4 a is the pressing part
• 4 5 is the center panel
• 4 6 is the raised wall
• 4 7 is the cleavage guide line
• 4 is the opening One part
• 49 is a tab
• 49a is a tip of the tab
• 50 is an opening piece.
• FIGS. 9 to 12 show the steps of forming a tear in the container lid using a die.
• T 30 is a lid material plate D.
• the lower die 31 and the upper die 32 form a part 30a for winding around the can body around the lid material plate 30.
• the plate portion 30b serving as the central portion of the D container lid is pressed down and formed.
• the molded product in the previous process is formed by a lower die die 37 and an upper die die 38 so as to have a vertical wall portion.
• Part 3 6a is subjected to shallow drawing.
• the lower die 37 and the upper die 38 intersect minutely, and the rising wall 36 rises at the clearance.
• the portion 36a is made so that the flesh is narrowed down to a shallow wall portion 39.
• the molded product in the previous process is placed on the lower die 40 as shown in FIG. 12 and the central panel surface extruded in the process shown in FIG. 3 5 is the upper die type 4 1! ) It is pushed down. That is, the lower die 40 supports the outer portion of the thin wall 39 formed in the previous process from below, and the upper die 40
• the standing wall portion 36 formed by the process of FIG. 10 is bent from the middle portion thereof, as shown in FIG. And 3 ⁇ 4]), and the thin standing wall 3'9 formed in the previous process collapsed due to the buckling phenomenon, and the tearing guide line
• a medium size is inserted into the bead portion.
• the center plate portion is used without using the medium size. Pressing down i) automatically forms a bent raised wall 42 and a cleavage guide line 43.
• the pressing portion 44a of the upper die type 44 is formed into a truncated cone shape as shown in FIG. 15, and the central wall portion 45 is pressed down to raise the upright wall portion. If it is made to bend while being inclined to the side, the raised wall 46 after forming is formed to be inclined to the tearing guide line 47 side as shown in FIG. When the raised wall 46 is formed to be inclined in this way, when the opening piece 48 is cleaved along the cleavage guide line 47, the cleaved portion is located below the raised wall 47. Because of this, the circumference of the opening piece 48 should be more secure.
• a tab 49 is attached to the container lid so that its tip 49a can be positioned over the rupture guide line 43 beyond the raised wall 42. Raise the tab 49 as in the case of general lids of some species to rupture the local area of the tear guide line 43, and then pull up the tab 49 to tear along the tear guide line 49. Opening is performed, and finally D is performed by removing the opening piece 50.
• the present invention relates to a method for forming a ruptured portion in a container, particularly when manufacturing a container lid in which the periphery of an opening piece after the rupture is safe, and producing a food container, a soft drink can, and other container containers. Can be widely used.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Containers Opened By Tearing Frangible Portions (AREA)
• Closures For Containers (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=16473511

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (1)

Family Cites Families (2)

• 1985
  • 1985-09-17 JP JP20340585A patent/JPH0683865B2/ja not_active Expired - Lifetime
• 1986
  • 1986-09-08 DE DE19863690476 patent/DE3690476T1/de not_active Withdrawn
  • 1986-09-08 WO PCT/JP1986/000454 patent/WO1987001628A1/ja active Application Filing
  • 1986-09-08 GB GB08710475A patent/GB2191130A/en not_active Withdrawn

Patent Citations (1)

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