WO2009064032A1

WO2009064032A1 - Dual sealing structure for container

Info

Publication number: WO2009064032A1
Application number: PCT/KR2007/005671
Authority: WO
Inventors: Hyunjin Cho
Original assignee: Hyunjin Cho
Priority date: 2007-11-12
Filing date: 2007-11-12
Publication date: 2009-05-22
Also published as: KR100782392B1

Abstract

Disclosed is a dual sealing structure for a container having a coupling structure of a screw- coupling type, a lug-bead type, a PT bead type, a press-fit type, and a crown type. The dual sealing structure comprises a first coupling section formed on an outer peripheral surface of a neck of the container, through which contents are received, and a cap provided at an inner peripheral surface thereof with a second coupling section coupled with the first coupling section, wherein a close contact section is formed at an inner portion of the cap and protrudes downward to closely make contact with an inner peripheral surface of the neck, and a groove is formed at an inner side of the close contact section. According to the dual sealing structure, the sidewall and close contact section of the cap closely make contact with the outer and inner peripheral surfaces of the container neck, so that the sealing force can be further increased.

Description

Description DUAL SEALING STRUCTURE FOR CONTAINER

Technical Field

[I] The present invention relates to a dual sealing structure for a container. More particularly, the present invention relates to a dual sealing structure for a container, which can facilitate opening and closing thereof and improving the sealing performance by modifying a neck, through which contents are received, and the structure of a cap coupled with the neck in the container for closely storing the contents, such as a bottle, a bottle can, and vessels used in the kitchen for living.

[2]

Background Art [3] In general, a cap for sealing an opening is coupled with a container such as a glass bottle, a steel bottle, a plastic bottle and a side dish case. [4] At this time, in order to improve sealing force, a coupling member is formed at the opening of the container and the cap to firmly couple the cap with the opening. [5] As generally known in the art, the coupling structure between the container and the cap may be classified into a lug-bead type, a PT bead type, a screw-coupling type (PP type), a press-fit type, and a crown-type according to the shape of the coupling structure.

[6] Hereinafter, the prior art about such a coupling structure will be described.

[7] FIG. 1 is a view showing a conventional lug-bead type sealing structure for a container and FIG. 2 is a perspective view showing the cap in FIG. 1. [8] According to the conventional lug-bead type sealing structure A'-l as shown in

FIGS. 1 and 2, a plurality of lug beads 100 are inclined and partially formed on the outer peripheral surface of the neck 20 of a container 2, and a plurality of lugs 470 are formed at the lower portion of a sidewall of a cap 4 such that the lugs 470 are coupled with the lug beads 100. [9] Accordingly, if the user rotates the cap 4 after fitting the cap 4 around the neck 20, the lugs 470 are locked with the lug beads 100 while rotatably moving along the lug beads 100. [10] FIG. 3 is a view showing a conventional PT bead type sealing structure for a container.

[I I] As shown in FIG. 3, in order to improve sealing force, the conventional PT bead type sealing structure A'-2 comprises a container 2, which includes a neck 20 and a plurality of neck beads 100' inclined and partially formed on the outer peripheral surface of the neck 20, and a cap 4 provided at an the inner peripheral surface thereof with a PT layer 490 closely making contact with the neck beads 100'.

[12] Accordingly, if the user rotates the cap 4 after fitting the cap 4 around the neck 20, the cap 4 is locked with the neck bead 100' while rotating along the neck beads 100' and the PT layer 490 closely makes contact with the outer surface of the neck 20, thereby sealing the container 2.

[13] FIG. 4 is a view showing a conventional screw-coupling type sealing structure for a container.

[14] According to the conventional screw-coupling type sealing structure A'-3 as shown in FIG. 4, spiral protrusions 22 are formed on the outer peripheral surface of the neck 20 of a container 2, and a screw section 410 is formed at the inner surface of a sidewall of a cap 4, so that the cap 4 is screw-coupled with the neck 20.

[15] FIG. 5 is a view showing a conventional press-fit type sealing structure for a container.

[16] According to the conventional press-fit type sealing structure A'-4 as shown in FIG.

5, an annular groove 230 is formed in the outer peripheral surface of a container neck 20, and an annular protrusion 450 is formed at the inner surface of a sidewall of a cap 4, so that the cap 4 is press-fitted around the container neck 20.

[17] According to the lug-bead type (A'- 1), PT bead type (A'- 2), screw-coupling type

(A'-3), press-fit type (A'-4) and crown-type sealing structures of the prior art, the inner surface of the sidewall of the cap 4 is screw-coupled with or press-fitted around the outer peripheral surface of the container neck 20, resulting in insufficiency of sealing force.

[18] Since the crown-type sealing structure typically employed in a beer bottle is generally known in the art, detailed description thereof will be omitted.

[19]

Disclosure of Invention Technical Problem

[20] The present invention has been made to solve the above problems occurring in the prior art, and an object of the present invention is to provide a dual sealing structure for a container, which can improve sealing performance with stronger sealing force by forming a close contact section, which closely makes contact with the inner peripheral surface of a container neck, at an inner side of a cap comprising glass, metal or plastic, and allowing the sidewall and close contact section of the cap to closely make contact with the outer and inner peripheral surfaces of the container neck in various coupling structures between the container neck and the cap, such as a lug-bead type, a PT bead type, a screw-coupling type and a press-fit type. Technical Solution

[22] In order to accomplish the above object, according to one aspect of the present invention, there is provided a dual sealing structure for a container comprising: a first coupling section formed on an outer peripheral surface of a neck of the container, through which contents are received; and a cap provided at an inner peripheral surface thereof with a second coupling section coupled with the first coupling section, wherein a close contact section is formed at an inner portion of the cap and protrudes downward to closely make contact with an inner peripheral surface of the neck, and a groove is formed at an inner side of the close contact section.

[23]

Advantageous Effects

[24] According to the present invention, a close contact section, which closely makes contact with the inner peripheral surface of a container neck, is formed at an inner side of a cap, and the sidewall and close contact section of the cap closely make contact with the outer and inner peripheral surfaces of the container neck, so that sealing performance can be significantly improved with stronger sealing force.

[25]

Brief Description of the Drawings

[26] The above and other advantages of the present invention will become readily apparent with reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:

[27] FIG. 1 is a view showing a conventional lug-bead type sealing structure for a container;

[28] FIG. 2 is a perspective view showing the cap in FIG. 1 ;

[29] FIG. 3 is a view showing a conventional PT bead type sealing structure for a container;

[30] FIG. 4 is a view showing a conventional screw-coupling type sealing structure for a container;

[31] FIG. 5 is a view showing a conventional press-fit type sealing structure for a container;

[32] FIGS. 6 to 9 are sectional views showing a dual sealing structure for a container according to the first embodiment of the present invention;

[33] FIG. 10 is an exploded perspective view illustrating the screw-coupling type shown in FIG. 6;

[34] FIGS. 11 to 13 are sectional views showing a dual sealing structure for a container according to the second embodiment of the present invention;

[35] FIG. 14 is a sectional view showing a dual sealing structure for a container according to the third embodiment of the present invention; [36] FIG. 15 is a sectional view showing a dual sealing structure for a container according to the fourth embodiment of the present invention; [37] FIGS. 16 and 17 are plan views showing the auxiliary protrusions in FIG. 15 according to the fourth embodiment of the present invention; [38] FIGS. 18 to 21 are sectional views showing a dual sealing structure for a container according to the fifth embodiment of the present invention; [39] FIG. 22 shows the state after a cap is separated from a container;

[40] FIG. 23 is a sectional view showing a dual sealing structure for a container according to the sixth embodiment of the present invention; [41] FIG. 24 is a sectional view showing a dual sealing structure for a container according to the seventh embodiment of the present invention; [42] FIG. 25 is a sectional view showing a dual sealing structure for a container according to the eighth embodiment of the present invention; [43] FIG. 26 is a plan sectional view illustrating the coupling state of a cap and a container shown in FIG. 25; [44] FIG. 27 is a sectional view showing a dual sealing structure for a container according to the ninth embodiment of the present invention; [45] FIG. 28 is a plan view illustrating the dual sealing structure for the container shown in FIG. 27; [46] FIG. 29 is a sectional view showing a dual sealing structure for a container according to the tenth embodiment of the present invention; [47] FIG. 30 is a sectional view showing a dual sealing structure for a container according to the eleventh embodiment of the present invention. [48]

Mode for the Invention [49] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. [50] In the description about the embodiment of the present invention, since the same reference numeral is used to designate the same element, detailed description thereof will be omitted. [51] According to the embodiment of the present invention, a cap 4 and a neck 20 of a container 2 have a circular shape, and the cap 4 is coupled with the neck 20 through the screw-coupling or press-fit scheme. [52] The cap 4 and a container 2 may have various shapes such as polygonal or oval shapes, in addition to the circular shape. [53] According to the screw-coupling structure, the coupling section of the neck 20 is prepared in the form of a continuous spiral protrusion 22, a lug bead 100 or a neck bead 100', in which the lug bead 100 and the neck bead 100 are inclined and partially formed on the neck 20. In addition, the coupling section of the cap 4 is prepared in the form of a screw, a lug or a PT layer such that the cap 4 is coupled with the neck 20. The above structure belongs to the lug-bead type (A'-l), PT bead type (A'-2), and screw-coupling type (A'-3) sealing structures described in the prior art.

[54] According to the press-fit structure, the coupling section of the neck 20 includes an annular protrusion and the coupling section of the cap 4 includes an annular groove, so that the cap 20 is press-fitted around the neck 2. The spiral protrusion 22 or the press- fit structure is applied to the crown type sealing structure.

[55] The present invention is characterized in that the cap 4 is provided therein with a close contact section 44 protruding downward, and the close contact section 44 closely makes contact with the inner peripheral surface of the neck 20 to enhance the airtight performance of the container 2.

[56] Further, in order to increase the sealing force, various coupling structures are formed at the outer peripheral surface of the close contact section 44 and the inner peripheral surface of the neck 20, such that the screw-coupling type, the lug bead type, the PT bead type, the press-fit type or the crown type coupling can be achieved. Hereinafter, the embodiments for the coupling structures will be described.

[57] The present invention provides four types of coupling structures according to the coupling state between the neck 20 and the cap 4. The crown type coupling structure will be omitted.

[58] FIGS. 6 to 9 are sectional views showing a dual sealing structure for a container according to the first embodiment of the present invention.

[59] FIG. 6 shows the screw-coupling type (Al-I), FIG. 7 shows the lug-bead type

(Al-2), FIG. 8 shows the PT bead type (Al-3), and FIG. 9 shows the press-fit type (Al-4).

[60] Hereinafter, the screw-coupling type (Al-I) will be described in more detail with reference to FIG. 6. The coupling section of the neck 20 is prepared in the form of continuous spiral protrusions 22, and a screw section 410 is formed at the inner surface of the sidewall of the cap 4, so that the cap 4 is screw-coupled with the neck 20.

[61] Further, the cap 4 is provided therein with the close contact section 44 that protrudes in the downward direction and closely makes contact with the inner peripheral surface of the neck 20, and the close contact section 44 is provided at the inner side thereof with a groove 46.

[62] Hereinafter, the lug-bead type (Al-2) will be described in more detail with reference to FIG. 7. A lug bead 100 is inclined and partially formed on the outer peripheral surface of the neck 20, and a lug 470 formed at the lower end of the sidewall of the cap 4 is coupled with the lug bead 100.

[63] Further, the cap 4 is provided therein with a close contact section 44 that protrudes in the downward direction and closely makes contact with the inner peripheral surface of the neck 20, and the close contact section 44 is provided at the inner side thereof with the groove 46.

[64] Hereinafter, the PT bead type (A 1-3) will be described in more detail with reference to FIG. 8. The container 2 is provided with a plurality of neck beads 100 having a predetermined length, which are inclined and partially formed on the outer peripheral surface of the neck 20, and the cap 4 is provided at the inner peripheral surface thereof with a PT layer 490 making contact with the neck beads 100' of the container 2.

[65] Further, the cap 4 is provided therein with a close contact section 44 that protrudes in the downward direction and closely makes contact with the inner peripheral surface of the neck 20, and the close contact section 44 is provided at the inner side thereof with a groove 46.

[66] Hereinafter, the press-fit type (A 1-4) will be described in more detail with reference to FIG. 9. An annular groove 230 is formed in the outer peripheral surface of the neck 20, and an annular protrusion 450 is formed in the inner surface of a sidewall of the cap 4, so that the cap 4 is press-fitted around the neck 20.

[67] Further, the cap 4 is provided therein with a close contact section 44 that protrudes in the downward direction and closely makes contact with the inner peripheral surface of the neck 20, and the close contact section 44 is provided at the inner side thereof with a groove 46.

[68] The description about the crown-type will be omitted.

[69] FIG. 10 is an exploded perspective view illustrating the screw-coupling type shown in FIG. 6.

[70] As shown in FIG. 10, the close contact section 44 is formed by recessing the upper surface of the cap 4. If the cap 4 comprises metal, the groove 46 can be formed at the inner side of the cap 4 when the cap 4 is formed by a press. If the cap 4 comprises plastic, the cap 4 is fabricated through injection molding such that the groove 46 is formed at the inner side thereof.

[71] In order to increase the strength of the cap 4, the groove 46 of the close contact section 44 can be filled with predetermined materials.

[72] Preferably, the close contact section 44 has the same diameter as the inner diameter of the neck 20, so that the close contact section 44 can be closely coupled with the neck 20.

[73] In addition, in order to improve the airtight performance by removing a space between the cap and the neck, a compound layer 441 is formed on the outer peripheral surface of the close contact section 44 to seal the close contact section 44 (see FIGS. 14 and 15).

[74] FIGS. 11 to 13 are sectional views showing a dual sealing structure for a container according to the second embodiment of the present invention. FIG. 11 shows the screw-coupling type (A2-1), FIG. 12 shows the lug-bead type (A2-2), and FIG. 13 shows the PT bead type (A2-3).

[75] Since the screw-coupling type, lug-bead type, PT-bead type and crown type coupling structures have been described above, they will not be further described in order to avoid redundancy.

[76] Hereinafter, the screw-coupling type (A2-1) will be described with reference to

FIG. 11. The coupling section of the neck 20 is prepared in the form of continuous spiral protrusions 22, and a screw section 410 is formed at the inner surface of the sidewall of the cap 4, so that the cap 4 is screw-coupled with the neck 20.

[77] The neck 20 is provided at the inner peripheral surface thereof with an inner peripheral surface coupling section 28 prepared in the form of continuous spiral protrusions, and the cap 4 is provided at the outer peripheral surface of a close contact section 44 thereof with a dual spiral coupling section 43 prepared in the form of a screw, so that the dual spiral coupling section 43 is coupled with the inner peripheral surface coupling section 28.

[78] Hereinafter, the lug-bead type (A2-2) will be described with reference to FIG. 12. A lug bead 100 is inclined and partially formed on the outer peripheral surface of the neck 20, and a lug 470 formed at the lower end of the sidewall of the cap 4 is coupled with the lug bead 100.

[79] An inner peripheral surface coupling section 28', which is prepared in the form of an inclined lug bead, is partially formed on the inner peripheral surface of the neck 20.

[80] A dual spiral coupling section 43' prepared in the form of a spiral groove is formed on the outer peripheral surface of the close contact section 44 of the cap 4, so that the dual spiral coupling section 43' is coupled with the inner peripheral surface coupling section 28'.

[81] Hereinafter, the PT bead type (A2-3) will be described with reference to FIG. 13.

The container 2 is provided with a plurality of neck beads 100' having a predetermined length, which are inclined and partially formed on the outer peripheral surface of the neck 20, and the cap 4 is provided at the inner peripheral surface thereof with a PT layer 490 making contact with the neck beads 100' of the container 2.

[82] An inner peripheral surface coupling section 28", which is prepared in the form of an inclined neck bead, is partially formed on the inner peripheral surface of the neck 20.

[83] A dual spiral coupling section 43' prepared in the form of a PT layer is formed on the outer peripheral surface of the close contact section 44 of the cap 4, so that the dual spiral coupling section 43" is coupled with the inner peripheral surface coupling section 28". [84] FIG. 14 is a sectional view showing a dual sealing structure for a container according to the third embodiment A3 of the present invention. [85] As shown in FIG. 14, the cap 4 is press-fitted around the neck 20 according to the third embodiment. To this end, the coupling section of the neck 20 is prepared in the form of an annular groove 230 and the coupling section of the cap 4 is prepared in the form of an annular protrusion 450. The neck 20 is provided at the inner peripheral surface thereof with an annular protrusion 23, and an annular groove 442 coupled with the annular protrusion 23 is formed on the outer peripheral surface of the close contact section 44 of the cap 4.

[86] The description about the crown type will be omitted in order to avoid redundancy.

[87] In the description about the second embodiment A2- 1 to A2-3 and the third embodiment A3, the coupling shape between the cap 4 and the neck 20 is identical to that between the outer peripheral surface and the inner peripheral surface of the neck

20. [88] That is, if the outer coupling structure between the neck 20 and the cap 4 is the screw-coupling type, the lug bead type, the PT bead type, the press-fit type or the crown type, the inner coupling structure between the inner peripheral surface of the neck 20 and the close contact section 44 of the cap 4 is the screw-coupling type, the lug bead type, the PT bead type, or the press-fit type. [89] However, the present invention is not limited thereto. The outer and inner coupling structures between the neck 20 and the cap 4 can be varied by properly combining the four coupling structures. [90] According to one example, the outer coupling structure may be the screw-coupling type and the inner coupling structure may be the lug-bead type. Further, the outer coupling structure may be the lug-bead type and the inner coupling structure may be the PT bead type. [91] FIG. 15 is a sectional view showing a dual sealing structure for a container according to the fourth embodiment A4 of the present invention. [92] As shown in FIG. 15, the fourth embodiment A4 further comprises auxiliary protrusions 47 and 47' formed on the bottom surface of the groove 46 of the close contact section 44 to reinforce strength.

[93] As shown in FIGS. 16 and 17, the auxiliary protrusions 47 and 47' have two shapes.

[94] FIGS. 16 and 17 are plan views showing the auxiliary protrusions in FIG. 15 according to the fourth embodiment A4 of the present invention. [95] As shown in FIG. 16, the auxiliary protrusion 47 has a cylindrical shape and protrudes in the upward direction, so that strength of the bottom surface of the groove 46 is increased to prevent the cap 4 from being broken. [96] As shown in FIG. 17, the auxiliary protrusion 47' has a quadrangular shape and protrudes in the upward direction. When the cap 4 has a large diameter to the extent that a user cannot easily grasp the outer peripheral portion of the cap 4, the user can open or close the cap 4 by grasping the auxiliary protrusion 47'. [97] FIGS. 18 to 21 are sectional views showing a dual sealing structure for a container according to the fifth embodiment A5 of the present invention. [98] FIGS. 18 and 20 illustrate the screw-coupling type (A2-1) shown in FIG. 11 and can be applied to other embodiments.

[99] FIGS. 18 and 20 show the state before the cap 4 is separated from the container 2.

[100] As shown in FIGS. 18 to 21, elastic recess sections 48 and 48', which can be recessed or returned to the initial position according to internal pressure of the container 2, are further formed at the lower central portion of the groove 46 of the close contact section 44. [101] The elastic recess sections 48 and 48' have a convex shape in the upward or downward direction. As shown in FIGS. 18 and 19, the elastic recess section may have a one-step structure 48. As shown in FIGS. 20 and 21, the elastic recess section may have a two-step structure 48.

[102] FIG. 22 shows the state after the cap 4 is separated from the container 2.

[103] As shown in FIG. 22, if the cap 4 is opened, the elastic recess sections 48 and 48' returns to its initial position due to pressure variation while generating sound "pop". [104] FIGS. 18 and 20 show the vacuum state of the container 2. Although not shown in

FIGS. 18 and 20, when the container 2 is filled with nitrogen gas, the elastic recess sections 48 and 48' enter a state opposite to the vacuum state shown in FIGS. 18 and

20. [105] FIG. 23 is a sectional view showing a dual sealing structure for a container according to the sixth embodiment A6 of the present invention. [106] As shown in FIG. 23, the storage protrusion 49 capable of storing an article is formed by recessing the bottom surface of the groove 46 of the close contact section 44 in the downward direction. [107] The storage protrusion 49 increases the strength of the bottom surface of the groove

46 of the close contact section 44. In addition, the groove 46, which is formed at a rear portion of the storage protrusion 49, can be used as a storage box. [108] FIG. 24 is a sectional view showing a dual sealing structure for a container according to the seventh embodiment A7 of the present invention. [109] As shown in FIG. 24, the seventh embodiment further comprises a cover 5 that covers the groove 46. The cover 5 can be prepared in a disposal type or a hinge type. [110] The disposal type denotes that the cover 5 adhering to the upper end rim of the groove 46 is discarded after the cap 4 is opened. [I l l] The hinge type denotes that the cover 5 is hinged to the upper end rim of the groove

46 such that the cover 5 can be opened or closed. [112] FIG. 25 is a perspective view showing a dual sealing structure for a container according to the eighth embodiment A8 of the present invention. FIG. 26 is a plan sectional view showing the coupling state of the cap 4 and the container 2 in FIG. 25. [113] As shown in FIGS. 25 and 26, the neck 20 is provided at the outer peripheral surface thereof with an annular protrusion 23, and the cap 4 is provided with an annular groove 442 coupled with the annular protrusion, so that the cap 4 is press-fitted around the neck 20. [114] Further, the neck 20 is provided at the inner peripheral surface thereof with an annular protrusion 23, and the annular protrusion 23 is provided with a plurality of vertical protrusions 25 in the longitudinal direction. [115] Furthermore, a close contact section 44 is provided at the outer peripheral surface with an annular groove 442 coupled with the annular protrusion 23, and the annular groove 442 is provided with a vertical grooves 446 in the longitudinal direction such that the vertical protrusions 25 are inserted into the vertical groove 446. [116] The vertical protrusions 25 are formed along the inner circumferential surface of the neck 20. Preferably, the vertical protrusion 25 has a quadrangular rod shape. [117] The vertical groove 446 of the close contact section 44 has a quadrangular shape such that the vertical protrusions 25 can be inserted into the vertical groove 446. [118] Accordingly, the cap 4 is press-fitted around the neck 20 of the container 2, so that the annular protrusion 23 of the neck 20 can be fixedly coupled with the annular groove 442 of the cap 4. [119] Simultaneously, the close contact section 44 of the cap 4 is closely coupled with the inner peripheral surface of the neck 20 such that airtight performance can be obtained therebetween. In addition, the vertical protrusions 25 are inserted into the vertical grooves 446, so that the contact area can be increased and the coupling state can be firmly maintained. [120] FIG. 27 is a perspective view showing a dual sealing structure for a container according to the ninth embodiment A9 of the present invention. FIG. 28 is a plan view showing the dual sealing structure for the container in FIG. 27. [121] As shown in FIG. 27, the inclined plate 7 is formed by inclining the bottom surface of the groove 46 of the close contact section 44 in one direction. [122] As shown in FIG. 28, various types of advertisement patterns 72, such as trademark names and trademark figures, can be formed at the upper portion of the inclined plate

7. The advertisement patterns 72 can be easily recognized with the naked eye because the inclined plate 7 is inclined by a predetermined angle. [123] It should be noted that the advertisement patterns 72 can also be formed on the bottom surface of the groove 46 of the close contact section 44, which is prepared in the form of a flat plate.

[124] FIG. 29 is a perspective view showing a dual sealing structure for a container according to the tenth embodiment AlO of the present invention, and FIG. 30 is a perspective view showing a dual sealing structure for a container according to the eleventh embodiment Al 1 of the present invention.

[125] As shown in FIG. 29, an upper plate 465 is integrally formed with the upper portion of a groove 46 of a close contact section 44 to increase the strength.

[126] As shown in FIG. 30, the inner portion of a groove 46 is filled with material identical to or different from that of the groove 46 to further increase the strength.

[127] Although the exemplary embodiments of the present invention have been described, it is understood that the present invention should not be limited to these exemplary embodiments but various changes and modifications can be made by one ordinary skilled in the art within the spirit and scope of the present invention as hereinafter claimed.

Claims

[1] A dual sealing structure for a container having a coupling structure of a screw- coupling type, a lug-bead type, a PT bead type, a press-fit type, and a crown type, the dual sealing structure comprising: a first coupling section formed on an outer peripheral surface of a neck of the container, through which contents are received; and a cap provided at an inner peripheral surface thereof with a second coupling section coupled with the first coupling section, wherein a close contact section is formed at an inner portion of the cap and protrudes downward to closely make contact with an inner peripheral surface of the neck, and a groove is formed at an inner side of the close contact section.

[2] The dual sealing structure as claimed in claim 1, further comprising: an inner peripheral surface coupling section formed on the inner peripheral surface of the neck and prepared in a form of one selected from a continuous spiral protrusion, a lug bead and a neck bead, wherein the lug bead and the neck bead being inclined and partially formed; and a dual spiral coupling section formed on an outer peripheral surface of the close contact section of the cap and prepared in a form of one selected from a screw section, a spiral groove and a PT layer coupled with the inner peripheral surface coupling section, wherein the cap is coupled with the neck through rotation.

[3] The dual sealing structure as claimed in claim 1, wherein the neck is provided at the inner peripheral surface thereof with an annular protrusion, an annular groove coupled with the annular protrusion is formed on an outer peripheral surface of the close contact section of the cap, and the close contact section is coupled with the neck through a press-fit scheme.

[4] The dual sealing structure as claimed in claim 1 or 3, wherein the neck is provided at the inner peripheral surface thereof with a vertical protrusion in a longitudinal direction, and a vertical groove is formed on the outer peripheral surface of the close contact section of the cap in a longitudinal direction such that the vertical protrusion is inserted into the vertical groove.

[5] The dual sealing structure as claimed in claim 1, further comprising an auxiliary protrusion formed at a bottom surface of the groove to reinforce strength of the bottom surface of the groove.

[6] The dual sealing structure as claimed in claim 5, wherein the auxiliary protrusion has a cylindrical shape and protrudes in an upward direction. [7] The dual sealing structure as claimed in claim 5, wherein the auxiliary protrusion has a quadrangular shape and protrudes in an upward direction. [8] The dual sealing structure as claimed in claim 1, further comprising an elastic recess section formed at a lower central portion of the groove and has a convex shape. [9] The dual sealing structure as claimed in claim 1 , further comprising a storage protrusion formed by recessing a bottom surface of the groove in a downward direction. [10] The dual sealing structure as claimed in claim 1, wherein the groove is provided with a disposal cover or a hinge type cover. [11] The dual sealing structure as claimed in claim 1, wherein an inclined plate is formed by inclining a bottom surface of the groove. [12] The dual sealing structure as claimed in claim 1, wherein an upper plate is integrally formed with an upper portion of the groove to increase strength. [13] The dual sealing structure as claimed in claim 1, wherein an inner portion of the groove is filled with predetermined materials to increase strength. [14] The dual sealing structure as claimed in claim 1, wherein an advertisement pattern is formed on a bottom surface of the groove.