Patent Application
20210139193
This invention relates to a basic shell, easy open end and can, especially a pressure resistant basic shell, easy open end and can with easy open end.
The easy open end was invented in last century 60's, and it was widely used in supporting packages for beverage cans and beer cans. Due to its advantages of light weight, small size and repeated use of waste, the easy open end was widely promoted worldwide and the huge production scale was formed. With the increasing demand for easy open ends, the easy open end industry was developed rapidly and the competition became more and more severe. Therefore, in order to save the resources, reduce the cost and meet the needs of market competition, the research and development of pressure resistant easy open end saving materials is not only the demand of enterprise survival and development, but also the certainty of market economic development.
In the prior art, a typical structure is shown in the prior art CN106672390A previously filed by the applicant of the present application. The easy open end structure disclosed in this patent is: it consists of the body and pull ring riveted to the body; the body 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, and the countersink portion and the extension portion forms a circular recess; the countersink is directly connected by the first straight portion, fourth arc portion and fifth arc portion and the end of fifth arc portion is directly connected with the end of ferrule arc section in an externally tangent way; and the upward extension portion of ferrule consists of the second straight portion and seventh arc section and the seventh arc section is connected with the center panel in a tangent way. The patented solution has good pressure resistance performance under the premise of saving materials, but the following deficiencies are still found in actual production:
I. As the countersink portion is only connected by the first straight portion, fourth arc portion and fifth arc portion and the fourth arc portion and fifth arc portion are connected in an externally tangent way, when the test pressure reaches the limit value during a pressure test, more than 80% of the countersink portion of body may be cracked and the use safety is poor, that is, the fifth arc portion of body will be broken when the pressure exceeds the limit in the actual use and the liquid in the can will be splashed;
II. As the connection of countersink portion and ferrule arc section is the externally tangent connection of arc to arc, the contact area of basic shell and can seaming mould (commonly known as seaming head) is too small and it's only the line contact, which results in the instability of can seaming and could not ensure the quality of can seaming.
The purpose of present invention is to provide a pressure resistant basic shell, easy open end and can with easy open end to lower the probability of breakage due to the failure of pressure resistance and improve the use safety and stability of can seaming under the premise of unchanged material thickness and pressure resistance value.
In order to achieve the purpose, the technical solution of basic shell applied by the present invention is: 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 the first straight portion, fourth arc portion and 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; 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 straight 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 A; the fifth arc portion, sixth arc portion and second straight portion are located at one side of the auxiliary line A and the ferrule arc section is located at the other side of the auxiliary line A;
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 of the sixth arc 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 A 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 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 and the radius of the fifth arc portion.
Further, 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.
Further, the angle between the second straight portion and the auxiliary line A is 5°˜12°.
In order to achieve the above purpose, the technical solution for easy open end adopted by the present invention is: a pressure resistant easy open end, which consists of a basic shell and pull ring and the basic shell adopts the above-mentioned technical solution for the basic shell.
Further, 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.
Further, the angle between the second straight portion and the auxiliary line A is 5°˜12°.
In order to achieve the above purpose, the technical solution for can adopted by the present invention is: 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 adopts the above-mentioned technical solution for the basic shell.
Further, 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.
Further, the angle between the second straight portion and the auxiliary line A is 5°˜12°.
The design principle of the present invention is: the present invention is developed through the detailed research on the basis of the prior art for a whole year to find the effective method to lower the probability of breakage due to the failure of pressure resistance: add a sixth arc portion R6 and a second straight portion L2 for the countersink portion, get the reasonable dimension of fifth arc portion R5 and sixth arc portion R6 and the position relationship of centers of fourth arc portion R4 and fifth arc portion R5 through the detailed research to finally and successfully lower the probability of breakage to 0.05%˜2.5% due to the failure of pressure resistance. It has significantly improved the safety of use.
Under the same pressure resistance test conditions, the basic shells of prior art mostly break as shown in the
The pressure resistance test comparison between the prior art and present invention is shown as follows:
On the other hand, as shown in
The present invention seems uncomplicated, but it brings about the above-mentioned unexpected effect, which is an important breakthrough in this field.
With reference to the accompanying drawings and embodiment, the present invention will be described in detail.
A pressure resistant basic shell as shown in the
As shown in the
As shown in the
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.
As shown in the
As shown in the
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.
As shown in the
As shown in the
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.
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
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
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.
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.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201810336714.8 | Apr 2018 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/097080 | 7/25/2018 | WO | 00 |
