A PRESSURE RESISTANT BASIC SHELL, EASY OPEN END AND CAN WITH EASY OPEN END

Abstract

A pressure resistant basic shell, easy open end and can with easy open end, wherein the basic shell consists of a can seaming portion, a countersink portion, a ferrule arc portion, an upward extension portion of ferrule and a center panel from periphery to center in the cross section; the countersink portion also consists of a sixth arc portion and a second straight portion, and the sixth arc portion and the second straight portion are connected in a tangent way, and the second straight portion and the ferrule arc portion are connected in a tangent way; the center of the sixth arc portion is located below the upper surface of the center panel. The break probability under the failure of pressure resistance is lowered to 0.05%˜2.5%, which significantly improves the safety of use.

Claims

1. A pressure resistant basic shell consists of a can seaming portion, a countersink portion, a ferrule arc portion, an upward extension portion of ferrule and a center panel from periphery to center in the cross section; the countersink portion consists of a first straight portion, a fourth arc portion and a fifth arc portion, and the first end of first straight portion is connected with the corresponding end of seaming portion, and its second end is connected with the first end of fourth arc portion and the first straight portion is connected with the fourth arc portion in a tangent way; the second end of fourth arc portion is connected with the first end of fifth arc portion and the fourth arc portion and fifth arc portion are connected in an externally tangent way; wherein: the countersink portion also consists of a sixth arc portion and a second straight portion, and the second end of the fifth arc portion is connected with the first end of the sixth arc portion and the fifth arc portion and the sixth arc portion are connected in an internally tangent way; the second end of the sixth arc portion is connected with the first end of the second straight portion, and the sixth arc portion and the second straight portion are connected in a tangent way; the second end of the second straight portion is connected with the first end of the ferrule arc section and the second straight portion and the ferrule arc section are connected in a tangent way; the radius of the fifth arc portion is greater than or equal to 0.25 mm and less than or equal to 2.5 mm; the radius of the sixth arc portion is greater than or equal to 2 mm and less than or equal to 6.5 mm; the radius of the ferrule arc portion is greater than or equal to 0.25 mm and less than or equal to 0.8 mm; the junction of second portion and ferrule arc portion is defined as the auxiliary point, and the straight line vertical to the center panel through auxiliary point is defined as the auxiliary line; the fifth arc portion, sixth arc portion and second straight portion are located at one side of the auxiliary line and the ferrule arc section is located at the other side of the auxiliary line; the direction of the auxiliary line is defined as up and down direction, and the side of basic shell facing the outside of can is up and the side of basic shell facing the inside of the can is down; in the up and down direction, the center of the sixth portion is located below the upper surface of the center panel; the projection distance between the center of fourth arc portion and center of the fifth arc portion on the auxiliary line is greater than or equal to 0.85 times of the sum of the radius of the fourth arc portion and the radius of the fifth arc portion, and less than or equal to the sum of the radius of the fourth arc portion and the radius of the fifth arc portion; the projection distance between the center of fourth arc portion and center of the fifth arc portion perpendicular to the auxiliary line is greater than or equal to 0, and less than or equal to 0.5 times of the sum of the radius of the fourth arc portion and the radius of the fifth arc portion.

2. The pressure resistant basic shell as claimed in claim 1, wherein: in the up and down direction, the junction of sixth arc portion and second straight portion is located below the upper surface of the center panel.

3. The pressure resistant basic shell as claimed in claim 1, wherein: the angle between the second straight portion and the auxiliary line is 5°˜12°.

4. A pressure resistant easy open end consists of a basic shell and pull ring wherein: the basic shell is the one as described in claim 1.

5. The pressure resistant easy open end as claimed in claim 4, wherein: in the up and down direction, the junction of sixth arc portion and second straight portion is located below the upper surface of the center panel.

6. The pressure resistant easy open end as claimed in claim 4, wherein: the angle between the second straight portion and the auxiliary line is 5°˜12°.

7. A pressure resistant can consists of a can shell and easy open end and the easy open end consists of a basic shell and pull ring wherein: the basic shell is the one as described in claim 1.

8. The pressure resistant can as claimed in claim 7, wherein: in the up and down direction, the junction of sixth arc portion and second straight portion is located below the upper surface of the center panel.

9. The pressure resistant can as claimed in claim 7, wherein: the angle between the second straight portion and the auxiliary line is 5°˜12°.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is the schematic view of cross-section of the basic shell of embodiment 1 of present invention;

[0019] FIG. 2 is the schematic view of the joining of the basic shell of embodiment 1 of present invention with the can seaming mould during the can seaming;

[0020] FIG. 3 is the photo of the state after the pressure resistance test of the basic shell of prior art;

[0021] FIG. 4 is the photo of the state after the pressure resistance test of the basic shell of embodiment of present invention;

SPECIFIC EMBODIMENT

[0022] With reference to the accompanying drawings and embodiment, the present invention will be described in detail.

Embodiment 1: Refer to FIG. 1 for a Pressure Resistant Basic Shell:

[0023] A pressure resistant basic shell as shown in the FIG. 1 consists of a can seaming portion, a countersink portion, a ferrule arc portion R7, an upward extension portion of ferrule and a center panel.

[0024] As shown in the FIG. 1, the can seaming portion consists of first arc portion R1, second arc portion R2 and third arc portion R3, which are connected in sequence, and the first arc portion R1 is internally tangent to the second arc portion R2, and the second arc portion R2 is internally tangent to the third arc portion R3.

[0025] As shown in the FIG. 1, the countersink portion consists of a first straight portion L1, a fourth arc portion R4 and a fifth arc portion R5, and the first end of first straight portion L1 is connected with the corresponding end of can seaming portion, the second end is connected with the first end of fourth arc portion R4 and the first straight portion L1 is tangent to the fourth arc portion R4; the second end of fourth arc portion R4 is connected with the first end of fifth arc portion R5 and the fourth arc portion R4 is externally tangent to the fifth arc portion R5. The main point of the embodiment is: the countersink portion also consists of a sixth arc portion R6 and a second straight portion L2, and the second end of the fifth arc portion R5 is connected with the first end of the sixth arc portion R6 and the fifth arc portion R5 and the sixth arc portion R6 are connected in an internally tangent way; the second end of the sixth arc portion R6 is connected with the first end of the second straight portion L2, and the sixth arc portion R6 and the second straight portion L2 are connected in a tangent way. And the second end of the second straight portion L2 is connected with the first end of the ferrule arc section R7 and the second straight portion L2 and the ferrule arc section R7 are connected in a tangent way.

[0026] The radius of the fifth arc portion R5 is greater than or equal to 0.25 mm and less than or equal to 2.5 mm; the radius of the sixth arc portion R6 is greater than or equal to 2 mm and less than or equal to 6.5 mm; the radius of the ferrule arc section R7 is greater than or equal to 0.25 mm and less than or equal to 0.8 mm.

[0027] As shown in the FIG. 1, the junction of second straight portion L2 and ferrule arc portion R7 is defined as the auxiliary point Q1, and the straight line vertical to the center panel through auxiliary point Q1 is defined as the auxiliary line A; the fifth arc portion R5, sixth arc portion R6 and second straight portion L2 are located at one side of the auxiliary line A and the ferrule arc section R7 is located at the other side of the auxiliary line A.

[0028] As shown in the FIG. 1, the direction of the auxiliary line A is defined as up and down direction, and the side of basic shell facing the outside of can is up and the side of basic shell facing the inside of the can is down; in the up and down direction, the center Y6 of the sixth arc portion R6 is located below the upper surface of the center panel L4; As shown in the FIG. 1, the projection distance H1 between the center Y4 of specific fourth arc portion R4 and center Y5 of the fifth arc portion R5 on the auxiliary line A is greater than or equal to 0.85 times of the sum of the radius of the fourth arc portion R4 and the radius of the fifth arc portion R5, and less than or equal to the sum of the radius of the fourth arc portion R4 and the radius of the fifth arc portion R5.

[0029] The projection distance W1 between the center Y4 of fourth arc portion R4 and center Y5 of the fifth arc portion R5 perpendicular to the auxiliary line A is greater than or equal to 0, and less than or equal to 0.5 times of the sum of the radius of the fourth arc portion R4 and the radius of the fifth arc portion R5.

[0030] As shown in the FIG. 1, it is preferred: in the up and down direction, the junction Q2 of sixth arc portion R6 and second straight portion L2 is located below the upper surface of the center panel L4, and it could achieve the better anti-breakage performance.

[0031] As shown in the FIG. 1, it is preferred: the angle a between the second straight portion L2 and the auxiliary line A is 5°˜12°.

[0032] The upward extension portion of ferrule consists of a third straight portion L3 and a eighth arc portion R8, and one end of the third straight portion L3 is connected with the ferrule arc section R7 in a tangent way, and its second end is connected with the eighth arc portion R8 in a tangent way, and the second end of the eighth arc portion R8 is connected with the center panel L4 in a tangent way. A center panel L4 could be a flat surface and could also be a substantially flat surface including a partially curved surface.

[0033] In the above embodiment, the dimension of the “arc portion” and “straight portion” refers to the dimension of the portion on the surface of the basic shell facing the outside of can (i.e. the up direction in the FIG. 1).

[0034] The break probability under the failure of pressure resistance of this embodiment is only 0.05%˜2.5%, which significantly improves the safety of use. Furthermore, as shown in FIG. 2, the second straight portion L2 of basic shell of present invention could form the surface contact with the can seaming mould 2 (commonly known as seaming head) during the can seaming to increase the contact area and significantly improve the stability of can seaming.

Embodiment 2: a pressure resistant easy open end, which consists of a basic shell and pull ring and the basic shell structure is the same as that described in embodiment 1 and will not be described here.
Embodiment 3: a pressure resistant can, which consists of a can shell and easy open end and the easy open end consists of a basic shell and pull ring, and the basic shell structure is the same as that described in embodiment 1 and will not be described here.

[0035] It should be noted that the above described embodiments are only for illustration of technical concept and characteristics of present invention with purpose of making those skilled in the art understand the present invention, and thus these embodiments shall not limit the protection range of present invention. The equivalent changes or modifications according to spiritual essence of present invention shall fall in the protection scope of present invention.