JPH10101104A - End part of container to be easily opened - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end part of a can, that has gas release scores for preventing a direct spout of gas and can be easily opened, and a succeeding processing method of the end part. SOLUTION: An end part has a tear panel 16 that is partly surrounded by tear scores 18. The tear scores 18 define regions for an opening 20 that is a through-hole in the end part made by tearing the tear panel 16 off from the rest of the end part, an operating pull tab 26 and a rivet 24 to attach the pull tab 26 at a position on the end part adjacent to the tear score 18 on the opposite side of the tear score 18 extending from the tear panel 16. The tear scores 18 enclose a gas releasing region and spout preventive scores 38 as well. The gas releasing region is adjacent to the rivet 24 and is opened first when the rivet 24 is pulled up by the pull tab 26. The spout preventive scores 38 are made in a place on the tear panel 16, on one side of the rivet 24 and adjacent to the gas release region, and extends along at least a part of the gas release region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an easy-to-open product container, in particular for beverage cans and beer cans.
pen) Regarding the can end. In particular, the present invention relates to an improved method of forming an easily open can end, an improved tool, and better anti-missing properties.
An improved can end is provided that exhibits sile characteristics.

[0002]

BACKGROUND OF THE INVENTION Many metal cans for holding beverages or other products are:
A pull tab is a tear strip defined by a score or score at the end of the can.
It has an easily openable can end attached to a strip). The pull knob is lifted to provide an opening at the end of the can for dispensing the contents of the can,
Then you can pull. For ecological and safety reasons, many areas require that the tear strip and attached pull knob be retained at the end of the can after opening the can. In order to meet these requirements, various designs have been proposed by the prior art to ensure that the tear strip and the pull tab do not separate from the can end. The pull knob is generally held at the end of the can by rivets. Methods of forming a can end are described in U.S. Pat. Nos. 4,465,204 and 45306, both issued to Kaminsky et al. And assigned to the assignee of the present invention.
No. 31 can be found in each specification. These patents are hereby incorporated by reference as fully set forth above.

[0003] In the case of manufacturing an easily open can end, the shell for the can end is firstly made of a sheet metal product, preferably,
Formed from aluminum sheet products. Then, the shell for the can end is converted into a conversion preform.
ss). In a typical operation of a working press, the can end shells are opened together and introduced between a spaced apart upper tool member and a lower tool member. Various tool operations, for example,
Rivet formation, panel formation, score line formation, stamping,
The press ram advances the upper tool member toward the lower tool member to either secure the knob and final staging. After performing the operation of the tool, the press ram is retracted until the upper and lower tool members are opened again and occupy the spaced positions.
The partially worked shell is transported for the next successive tooling operation until the easily opened can end is completely formed and released from the press. As one shell leaves the predetermined tool operating position, another shell is introduced into the emptied operating position, thus continuously repeating the completely easy opening can end manufacturing process.

[0004] The sheet material from which the shell for the can end is manufactured is:
Special coatings are applied during manufacture. This coating serves several purposes, including the inability to substantially completely eliminate the so-called "aluminum taste" that can be experienced when consuming products contained in aluminum containers. Such coatings are particularly resilient and are expected to withstand exceptionally satisfactory levels of extensive shaping and reshaping performed during the manufacture of can ends fabricated from aluminum sheet products. ing. Nevertheless, the processed can end may occasionally exhibit metal exposure caused by damage to the coating. Such damage may occur after manufacture and handling of the can end. For example, at the completion of the processing step, the processed can ends are stacked or nested such that one can end is placed on another can end, and Wrapped in a paper sleeve for transport to the filling line. In the can filling line, the can body is filled with a beverage product, and the processed can end is attached to the can body filled with the beverage. During the stacking or nesting process, the top surface of the first can end, i.e., the customer side, contacts the bottom surface of the adjacent can end, i.e., the beverage side. Providing any rotational movement relative to the can end may damage the beverage side coating of the can end. For example, a wide range of beads where one or several portions of the can end can be positioned such that the tabs on the can end are below the criteria generally defined by the peeled planar bottom panel portion. Or can ends using similar components often suffer damage to their coatings.

Some canned products, such as carbonated beverages, can have values on the order of 6.3 kg / cm ² (90 pounds per square inch) to 7 kg / cm ² (100 pounds per square inch) or more. Substantial internal pressure is acting, so this internal pressure must be evacuated quickly and safely while the customer first opens the can end. Therefore,
The can end is configured to relieve, ie, release, the internal pressure of the container during the initial operation of the end opening mechanism. Degassing mechanisms are described in prior art patents, for example, U.S. Pat. Nos. 4,015,744 and 4,030,631, the contents of which are hereby incorporated by reference as if fully set forth herein. Invite. As briefly described above, the easily opened mechanism includes a terminal panel attached to the can body or container, a tear panel defined by the score line on the terminal panel, and a nose extending partially over the tear panel. Includes an operating knob and an integral rivet that connects the knob to the terminal panel and defines a pivot point for operating the knob. Essentially, lifting the knob first exerts an upward force on the rivet and a downward force on the edge of the tear panel adjacent the origin of the score line in the tear panel. As a result, the tear panel is first opened below the nose of the knob in an area called the vent area at the end of the can. As the knob is further lifted, the tear panel gradually separates along its score line,
Leave a small integral connection between the terminal panel and the tear panel. Around this connection, the tear panel is rotated inward of the container, forming an opening through which the contents of the container can be removed.

As described above, a substantial internal pressure of gas may act in the container. This gas pressure must be safely vented during the first opening operation. It is typical practice to form a small vent opening with a catch at the radially inner end of the score line. This vent opening or area extends the score line of the tear panel to a score stop located in the outward region of the can end. The score line break is typically in the form of a shallower sector of a relatively short length score line as described in U.S. Pat. No. 4,539,89. The contents of this US patent are fully incorporated herein by reference, as fully set forth above. The score line break increases tear resistance along the score line.

US Pat. No. 5,375,729, issued for easily opened container ends, teaches the use of a blast protection structure formed by a bead operation. The formed bead is then stamped or coined.

It is an object of the present invention to provide a can end having an improved squirt prevention structure.

Yet another object of the present invention does not require the presence of beads or similar stamped or stamped bead structures that can adversely affect the beverage side coating of the processed can end. It is an object of the present invention to provide a can end having a structure for preventing an improved jetting action.

It is yet another object of the present invention to provide a method for preventing squirting during venting of a machined can end.

Yet another object of the present invention is to provide an improved tool set for manufacturing a machined can end.

It is another object of the present invention to provide a processed can end and a method of manufacturing the can end.

[0013]

SUMMARY OF THE INVENTION The present invention comprises an easily opened can end having an integrally formed vent vent notch that prevents direct bleeding action, a method of further forming the can end, and a method of forming the can end. A tool for performing the method and the device of the invention are provided. In an easily opened can end for a beer or beverage container, the can end has a fracture scoring line surrounding a portion of the perimeter of the tear panel.
oreline). The break score line defines an area where the tear panel is to be separated from the remainder of the end to form an opening through the end. This end includes a control knob and an integral rivet that attaches the knob to the end adjacent the break score line. The rivet is provided on the opposite side of the break score line from the tear panel. The break score line includes a vent area adjacent the rivet configured and arranged to be opened first in the vent area in response to lifting of the rivet by the knob. While lifting the knob, there is often an initial "pop" with some small resistance.
Once this resistance is overcome, the torn panel tends to separate from the panel with substantially uniform pressure. This final opening effort is often referred to in the industry as a "push" following the first "pop" that occurs when a customer opens an easily opened can end.

According to the present invention, the spouting preventing score line (a
An anti-missile score is formed in the tear panel on one side of the rivet and adjacent to the edge of the score line vent area. The anti-blow scoring line has a length that extends along at least a portion of the vent area. When the vent area is broken, the anti-squirt score lines temporarily move the edge of the tear panel below the end panel. This temporary placement of the initially broken portion of the tear panel prevents rapid tearing of the tear panel from the terminal panel or, more simply, serves to prevent "missiling" of the tear panel. The anti-squirt score lines are typically short, straight score lines or can be contoured to the shape of the fracture scoreline in the vent area. The break score line has a first predetermined depth. The blast effect preventing score has a second predetermined depth that is less than the first predetermined depth of the break score. In addition, the break prevention score line (anti-
The fracture scale can be placed on the tear panel. In one embodiment, the break prevention score line is located inside the break score line. In another embodiment, the break prevention score line is located outside the break score line. The anti-squirt score has a depth that is less than the depth of the break prevention score. Since the depth of the bleeding action preventing score line is controlled and shallower than the depth of the breaking score line, the scoring operation is performed.
Ion) is unlikely to cause movement of metal at the bottom of the can end panel, i.e. at the product side. Not only is the potential damage caused by the metal forming process eliminated by using anti-squirt score lines, but also the metal hangs down the panel, thereby possibly adjacent cans during stacking. Contact with the battery does not occur. In addition, another embodiment of the contour and location of the anti-squirt score line is disclosed.

[0015] The tool for processing the can end shell into an easily opened can end comprises a number of separate stations adapted for incorporation into a complete tool set for a can end processing press. ing. In accordance with the present invention, one of the tool stations is adapted to further form the panel metal to provide an additional anti-sparging score line closest to the venting area of the tear panel. . The upper tool in the working press can include a score line knife or knife blade to perform the desired operation.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS The above features, as well as other features and advantages of the present invention, may be understood by considering a detailed description of the invention in connection with the several drawings. A machined can end incorporating features of the present invention is shown generally at 10 in FIGS. The can end 10 is a generally circular end panel including a circumferentially extending raised edge 14 for attaching the can end to a suitable cylindrical beverage can (not shown) or similar can. It has 12. The can end 10 is typically made of a relatively ductile metal, such as aluminum, but can be made of other acceptable materials if desired.

A retained tear strip 16 extends from a location spaced inwardly of the raised edge 14 to approximately the center of the can end 10. The tear strip 16 is defined by a generally V-shaped score line 18 having a V-shaped open end 20 disposed toward the center of the can end 10. The score line 18 shows the tear strip 1 when the can is opened.
6 is interrupted so as to be captured and held under the can end 10, i.e., the product side 22.
d).

The integral rivet 24 has a V-shaped score line 18.
A grippable ring-shaped knob 26, which is located adjacent to the open end 20 of the can and which can be formed into any desired size and shape, is secured to the can end 10 by rivets 24. The pull knob 26 lifts the pull knob 26 so that the nose portion 2 for initiating a break along the score line 18 when the tear strip 16 is broken and opened as is well known in the art.
8 is provided. As can be seen, the pull knob 26 has a finger portion 30 opposite the nose portion 28. The open end 20 of the V-shaped score line 18 is a knob 26
Is disposed below the nose 28 and adjacent to the rivet 24. This part of the panel 12 of the can end 10 is a venting area. This venting area is opened and the internal pressure is released, i.e. exhausted by the knob 26
Is first lifted by the customer. It should be understood that the industry is constantly striving to reduce the thickness of the material from which the can ends are manufactured. For example, most existing can ends are 206, 204, or 20
It has dimensions as two diameter ends. "206 diameter end" is 6 cm (2 inches + 6/16 inches) in end diameter
And "202 diameter end" means that the diameter of the end is 5.4 cm (2 inches + 2/16 inches). The smaller the diameter of the can end, the smaller the thickness of the metal used to manufacture the end. The 206 diameter end is typically about 0.24
mm (0.0096 inch) to 0.27 mm (0.010
6 inches), and 202 diameter ends are typically about 0.2 mm.
Manufactured from metal having a thickness of 2 mm (0.0088 inches).

The manufacturing process for processing the can end shell into an easily open can end is performed in a working press, a portion of which is shown in FIG. The Minster Machine Company of Minster, Ohio, USA manufactures and sells suitable presses for construction as can end processing presses. The processing press 40 is generally
Fixed press floor 42 including a substantially planar horizontal top surface 44
including. The upper surface 44 supports a tool base 46. The tool base 46 includes a tool base 46 having a planar bottom surface 48 and a planar upper surface 50. On the upper surface 50 of the tool base 46, a lower tool member 52 (shown by imaginary lines) formed in various shapes depending on a tool operation performed on the can end portion shell 54 is arranged. I have. However, each lower tool member 52 has a planar bottom surface 56 that mates with the upper surface 50 of the tool base 46 to provide a stable support member for the tool member.

A vertically movable press ram 58 is disposed on the press floor and includes a substantially planar horizontal lower surface 60. This lower surface 60 of the press ram 58 is
2 is supported. The tool support 62 can be of multiple shapes depending on the type selected for the particular tool operation. However, in general, the tool support or base 62 is adapted to secure the tool support 62 to the press ram in such a manner that the lower surface 60
And a top flat surface 64 for solid mating contact with the top. The tool support device 62 reliably supports an upper tool member (shown in phantom) 66 having a planar upper surface 68 that mates with and contacts a planar lower surface 70 of the tool support device. Upper tool member 66
Can be formed into one of a number of shapes and sizes depending on the particular tool operation to be performed. Typically, a centering ring 72 places the can end shell 54 in each tool station.
The various types of tooling to be performed in succession were to form a foam in the center of the opened can lid, to form a foam in the button, to make a score line in the opening and to make a score line. A panel is formed at the end of the can in the area surrounding the opening, a pull knob is attached to the end of the can, and a warning such as "lift", "pull back", or "disposal properly" at the end of the can Includes engraving with characters by stamping. U.S. Pat. No. 4,610,156, assigned to the assignee of the present invention, provides a detailed description of the various tool stations of a working press. The contents of this patent are fully incorporated herein by reference as set forth above. The can end working method is a process for continuously cold working metal in several steps in which differently shaped tools work the can end shell into an easily opened can end. You may need a station.

Referring now to FIGS. 4 and 5, the main score line 18 defines the contour of the generally V-shaped tear strip 16. As is known in the art, the depth of score line 18 can vary along the perimeter of tear panel 16. As shown in the cross-sectional view of FIG. 5, the main score line 18 formed is a V-shaped score line or score line located on the customer side or top surface of the panel. Such a main score line is
Typically, the bottom or land of score line 18 is
It is provided so as to leave a remaining portion R ₁ of the metal between the product side 22 of d) 32 and the can end. This residual portion is typically approximately 0.11 mm (0.0039 inches + 0.4 mm).
0004 inches) to 0.09 mm (0.0039-0.
0004 inches). The land 32 of the main score line 18 is approximately 0.03 mm (0.001 mm).
It has a width in the range from 0 inches to 0.0015 inches. The opposing inner walls 34 and 36 of the score line 18 have an included angle of about 50 °.

In the first embodiment, the squirt-preventing score line 38 is located adjacent to the main score line 18 of the tear panel 16. Ejection action preventing score line 38 is approximately 0.05 mm
(0.0015 + 0.0005 inch) to 0.03mm
It has a land portion 80 having a width in the range (0.0015-0.0005 inches). V-shaped side wall 8
The included angle defined by 2 and 84 is approximately 55 ° to 65 °
And preferably 60 °. The squirt prevention score line 38 is approximately 0.01 mm (0.0040 inches) deep when measured from the product end of the can end to the land 80. The bottom jet action prevents score line 38, i.e., it is preferable to leave a remaining portion R ₂ of the metal between the product side 22 of the lands 80 and the can end. Remaining portion R ₂ is preferably substantially within a range from 0.13 mm (0.0048 + 0.0004 inch) to approximately 0.11mm (0.0048-0.0004 inches). As can be more clearly understood from FIG. 4, the anti-squirt score line 38 of this embodiment has a length in the range of approximately 1.5 mm (0.060 inch) to 3.0 mm (0.120 inch). And preferably have a length of approximately 2.5 mm (0.100 inches). The blast-prevention score line 38 is approximately 0.64 mm (0.025 inch) from the main score line 18.

In addition to the main score line 18, the applicant has the reference
Break-preventing score lines, denoted by 0, were sometimes used. The break prevention score line 90 is approximately 0.16 mm (0.0059+
0.0004 inch) to 0.13 mm (0.0059-
This is a shallow score line that leaves a residual portion within a range of up to 0.0004 inches. Break prevention score line 90 substantially follows the shape of main score line 18 entirely U-shaped. The break prevention score line 90 has side walls 92 and 9 defining an included angle of approximately 50 °.
4 The width of the land 96 of the break prevention score line 90 is 0.04 mm (0.0015 inches). The break prevention score line 90 typically leaves a residual portion R _{3 of} metal between the bottom of the score line 90, ie, the land 96 and the product side 22 of the can end. Remaining portion R ₃ is approximately 0.16 mm (0.
0059 + 0.0004 inch) to 0.14 mm (0.
0059-0.0004 inches). When the break prevention score line 90 is used, the break prevention score line is approximately 1.3 mm (0.05 mm) inside the main score line 18.
0 inches). In this embodiment, the blast-preventing score line 38 is located between the break-preventing score line 90 and the main score line 18.

Referring now to FIG. 6, there is shown an example of an anti-blow scoring tool that can be used to form the anti-blow scoring line. The scoring line tool has a main body portion 101 that terminates on a lower surface 103, and a jetting action preventing score line knife 105 protrudes downward from the lower surface 104. The score line knife 105 includes a knife blade 107 and a pair of laterally upwardly and outwardly extending side wall portions 1 at an angle adapted to form the anti-squirt score line 38.
09 and 111. By supporting the can end on a suitable anvil, preferably having a planar upper surface, and applying compressive force to the upper surface of the can end with a score line knife 107, a metal flow is induced. 4 and 5 are formed. A simple flat anvil 113 is used. On the beverage side 22 of the panel, a very small, if any, anti-squirt score line 38 is shown.
The working press can have from six to eight tool stations that cooperate to form a can end shell for producing an easily opened can end. The anti-spout scoring tool of the present invention can be incorporated into one of the last several stations. It has been found that a satisfactory result is obtained when the anti-squirting score is formed at the end of the can located at one of the last stations of the processing sequence.

Referring to FIGS. 7 and 8, there is shown another embodiment of the scouring prevention line of the present invention. In this case, the position of the squirting action preventing score line is changed, and another shape of the squirting action preventing score line is disclosed. 4 and 5, the main score line 18 is approximately V
It forms the contour of the tear strip 16 which is shaped like a letter.
The shapes and dimensions of the main score line 18 and the break prevention score line 90 are as described above.

The anti-squirting score line 238 is a main score line 18 of the tear panel 16 opposite the main score line 18 at which the break prevention score line 90 is or is typically located.
And are arranged adjacently. Ejection action prevention score line 238
Are located on the panel at the end of the can. This location of the anti-squirting score line 238 can be best understood from FIG. FIG. 8 shows another embodiment of the score line for preventing ejection action. It should be understood that the V-shaped embodiment of the anti-squirt score line shown in FIG. 5 can be utilized in the position shown in FIG. However, it is preferred that the blowout preventing score line 238 be constructed according to the embodiment shown in FIG. The anti-squirt score line 238 includes a land portion 380 having a width in the range of approximately 0.140 mm (0.0040 + 0.0005 inches) to 0.09 mm (0.0040-0.0005 inches). The included angle formed by the side walls 382 and 384 is approximately 45 °. It is preferable that the side wall portion 384 is perpendicular to the surface of the terminal panel 12. The spouting prevention score line 238 is
It has a depth of approximately 0.10 mm (0.0040 inch) when measured from the product end of the can end to the land 380. The anti-squirt score line 238 has a residual portion R _{2 of} metal between the bottom, i.
It is preferable to leave Remaining portion R ₂ approximately 0.13mm
(0.0048 + 0.0004 inch) to 0.11mm
(0.0048-0.0004 inches). The anti-squirt score line 238 is approximately 1.5 mm (0.060 inches) to 3 mm (0.120 inches) in length and approximately 2.5 mm
(0.100 inches). The ejection preventing score line 238 is approximately 0.63 mm from the main score line 18 (0.
025 inches).

Referring now to FIG. 9, there is shown an example of an anti-blow scoring tool that can be used to form another embodiment of a anti-blow scoring line. The score line tool has a main body portion 301 that terminates on a lower surface 303, and a spout prevention score line knife 305 protrudes downward from the lower surface 301. The score line knife 305 includes a knife blade 307 and a pair of laterally extending generally upwardly and outwardly extending side walls 309 and 311 at an angle adapted to form a squirt prevention score line. Having each. A suitable anvil surface 313 with a can end having a preferably planar top surface
It will be appreciated that the metal flow is induced by supporting it above and applying a compressive force to the top surface of the can end with the score knife 307 to form the anti-squirt score line of FIG. . The working press can have six to eight tool stations cooperating to form a can end shell for producing an easily opened can end. The anti-blowout score tool of the present invention can be incorporated into one of the last several stations. Typically, a satisfactory result can be obtained by forming an anti-blow scoring line at the end of the can located at one of the last stations of the machining sequence before heading the knob on the rivet. found.

The present invention is particularly directed to an improved method of forming a can end, a tool for forming the same, and an easily opened can having an improved anti-squirt score line. While the method described herein and the form of the apparatus for performing the method constitute a preferred embodiment of the present invention, the invention is not limited to this exact method and form of apparatus. It should be understood that modifications can be made without departing from the scope of the invention as defined in the claims.

[Brief description of the drawings]

FIG. 1 is a top plan view of an improved easily opened can end incorporating features of the present invention.

FIG. 2 is a cross-sectional side view of FIG. 1 cut along the line BB.

FIG. 3 is a cross-sectional side view illustrating a press ram, a tool support device, an upper tool member and a lower tool member, a support base, and a stationary press bed.

FIG. 4 is a plan view showing details of an easily opened can end tear panel having a knob shown in a phantom view incorporating a first embodiment of the anti-squirt score line of the present invention.

FIG. 5 is a detailed cross-sectional view of the easily opened can end taken from FIG. 4 along the section 3B-3B, illustrating the main break score line, the break prevention score line and the ejection preventing score line.

FIG. 6 is an enlarged view of a part of the upper tool and the lower tool after the operation of forming the ejection action preventing score line is completed.

FIG. 7 is a plan view showing details of an easily opened can end tear panel having the knob shown in a phantom view incorporating another embodiment of the anti-squirt score line of the present invention.

FIG. 8 is a cross-section of an easily opened can end cut from FIG. 7 along section 7-8, illustrating another embodiment of a main break score line, a break prevention score line, and a blowout prevention score line. Detail view.

FIG. 9 is a cross-sectional view showing a detail of an easily opened can end showing another embodiment of the anti-squirt score line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 can end 12 terminal panel 14 raised edge 16 tear strip 18 main score line 22 product side 24 rivet 26 pulling knob 28 nose portion 30 finger portion 32 land 34 inner wall portion 36 inner wall portion 38 ejection prevention preventing score line 40 working press 52 Lower tool member 62 Tool support device 66 Upper tool member 80 Land portion 82 Side wall portion 84 Side wall portion 90 Break prevention score line 92 Side wall portion 94 Side wall portion 96 Land 101 Main body portion 103 Lower surface 105 Knife for ejection prevention action score line 238 Spout Action preventing score line 380 Land 382 Side wall 384 Side wall

Claims (25)

[Claims] 1. An easily openable end for a container,
The end has a tear panel defined by a break score line surrounding a portion of the perimeter of the panel;
The break score line is such that the tear panel is separated from the remainder of the end, thereby opening through the end, an operating knob, and the break opposite the break score line from the tear panel. Defining an area forming an integral rivet for attaching said knob to said end adjacent to a score line;
The break score line includes a vent area adjacent to the rivet, and the break score line is configured and arranged to be first opened in the gas vent area in response to lifting of the rivet by the knob. A portion formed on the tear panel on one side of the rivet and adjacent to the vent area of the break score line;
And an end portion having a length that extends along at least a portion of the degassing region and having a blast effect preventing score line. 2. The easily opened end according to claim 1, wherein the blowout preventing score has a contour that matches the shape of the break score in the vent area. 3. The easily opened end according to claim 1, wherein the anti-squirt score line is substantially linear. 4. The breaking score line has a first predetermined depth, and the blowout preventing score line has a first predetermined depth.
2. The easily opened end of claim 1 having a second predetermined depth that is less than the predetermined depth. 5. The easily opened end of claim 1 wherein the breakage of the venting area causes the edge of the tear panel to temporarily move below the end opposite the broken score line. . 6. The method according to claim 6, further comprising a break prevention score line substantially parallel to a substantial portion of the break score line, and wherein the blowout prevention score line is between the break score line and the break prevention score line. 2. The easily openable end of claim 1, wherein the end is disposed at 7. The method according to claim 1, wherein the length of the squirting prevention line is approximately 1.5 mm (0.060 inch) to 3.0 mm (0.12 inch).
2. The easily opened end of claim 1, which is in the range of 0 inches. 8. The easily opened end according to claim 7, wherein the length of the anti-squirt score line is approximately 2.5 mm (0.100 inch). 9. The easily opened end according to claim 1, wherein the anti-squirt score line includes a pair of opposed side walls defining an included angle in the range of about 55 ° to 65 °. 10. The blowing action preventing score line is approximately 60 °.
10. A pair of opposed side wall portions defining the included angle of
Easy to open end as described in. 11. The easily opened end of claim 1, wherein the break score line includes a pair of opposed side walls defining an included angle of approximately 50 °. 12. The easily opened end of claim 6, wherein said break prevention score line includes a pair of opposed side walls defining an included angle of approximately 50 °. 13. The breaking prevention score line is approximately 0.4 mm.
7. The easily openable end of claim 6, defining a land having a width of (0.0015 inches). 14. The breaking score line is approximately 0.03 mm.
The easily opened end of claim 1 defining a land having a width of (0.0010 inches). 15. The squirting line for preventing the ejection action is substantially 0.0
The easily opened end of claim 1 defining a land having a width of 4 mm (0.0015 inches). 16. A breakable score line substantially parallel to a substantial portion of the break score line, and wherein the blast effect preventing score line is between the break score line and the break score line. A second predetermined depth, wherein the break prevention score line is disposed and has a first predetermined depth, and the blowout prevention score line is shallower than a third predetermined depth of the break prevention score line 2. The easily opened end of claim 1, comprising: 17. The easily openable end of claim 1, wherein the easily openable end has a panel and the blowout preventing score line is located on the panel closest to the breakage score line. 18. The method of claim 17, wherein the anti-squirting score lines include a pair of substantially opposing side walls, and one of the side walls is substantially perpendicular to the tear panel.
Easy to open end as described in. 19. The easily opened end according to claim 18, wherein the opposing side walls define an included angle of approximately 45 °. 20. The easily openable end of claim 8, wherein the easily openable end has a panel and the blowout preventing score line is located on the panel closest to the breakout score line. . 21. An easily openable end for a container having a panel having a public side and a product side and having a tear panel defined by a break score line in the panel. Said tear score line surrounding a portion of said tear panel to be separated from the remainder of said end to form an opening in said end, further comprising: an operating knob; and said tear score. An integral rivet that attaches the tab to the end adjacent the line and opposite the tear line from the tear panel, the tear line including a vent area adjacent the rivet; A break score is configured and arranged to open first in the vent area in response to lifting of the rivet by the knob and a first break of the break score, and further comprising a public side of the tear panel. End which is easily opened for a container having formed ejected action preventing score line. 22. An easily openable end for a container having a panel having a public side and a product side and having a tear panel defined by a break score line in the panel. The tear notch line surrounding a portion of the perimeter of the tear panel that is to be separated from the remainder of the end to form an opening at the end, further comprising: an operating knob; An integral rivet that attaches the knob to the end adjacent the line and opposite the tear notch from the tear panel, the tear notch including a vent area adjacent the rivet; The break score line is configured and arranged to be opened first in the vent area in response to lifting of the rivet by the knob and a first break of the break score line, and further configured on the public side of the panel. Easily openable end for containers with anti-squirt score lines formed. 23. An easily openable end for a container adapted to contain pressurized contents, the end being the remainder of the end to form a discharge opening therein. Tear panel defined by a score line surrounding the perimeter of the panel to be separated from the operating knob, and adjacent the break score line and opposite the tear score line from the tear panel. An integral rivet for attaching the knob to the end, the break score line including a vent area adjacent the rivet, the break score line venting in response to lifting the rivet by the knob. The method for defining and arranging the length of the venting area is such that it is constructed and arranged to first break and open in the area, on one side of the rivet and at the edge of the venting area of the score line. An easily opened end for the container including forming anti-squirt score lines along the tear panel. 24. An anti-squirting score line tool for forming an anti-squirting score line for forming an anti-squirting score line at an end that can be easily opened. Spouting prevention score line tool extending downward. 25. The method according to claim 2, which is combined with a working press.
4. The tool for squirting action preventing score lines according to 4.