Structure for holding flap of bottle cap and bottle

Abstract

Disclosed herein are a flip-top retention structure for a bottle cap, and a bottle. By configuring lengths and positions of inner-side cuts and outer-side cuts, a contact portion is formed between a cap base and a flip-top when the flip-top is flipped 180°; tension of a connecting band causes the contact portion to generate elastic deformation, or the connecting band is stretched to generate elastic deformation; and after the flip-top is flipped beyond 180°, the contact portion or the connecting band rebounds, causing the flip-top to be maintained in a force-retained state. This ensures the flip-top remains in an open state, preventing the flip-top from touching a user's mouth or nose during drinking and thereby avoiding interference with the drinking process. It features ease of use and convenient opening. Furthermore, the structure of the bottle cap is simplified, further reducing the difficulty of molding and production.

Description

TECHNICAL FIELD

[0001] This disclosure relates to packaging containers and, in particular, to a flip-top retention structure for a bottle cap, and a bottle.BACKGROUND

[0002] Nowadays, during the opening and use of a flip-top, due to influences such as the design structure of the flip-top, the flip-top tends to flip back relative to the bottle or cap base, causing contact with a user's mouth or nose. Additionally, it is common for the flip-top to re-cover the liquid outlet of the bottle or cap base. In such cases, the user has to re-operate the flip-top to open it again for drinking, resulting in inconvenience during use.

[0003] For example, currently, there are three types of flip-top bottle caps. The first type involves arranging a circumferential tear line with an opening on the bottle cap. After the bottle cap is opened, a portion of the tear line with the opening does not break, forming a connecting band between the cap base and the flip-top. The connecting band is generally narrow, typically only 1-2 mm in width. The flip-top usually opens to an angle less than 180° and, if the angle exceeds 180°, the connecting band is prone to breakage, which may cause the flip-top to touch the user's mouth or nose during drinking.

[0004] The second type involves arranging a circumferential tear line and a short tear line, with a pair of axial cuts (two cuts per pair) disposed therebetween. After the circumferential and short tear lines break, a portion between the cuts forms a connecting band. The connecting band is relatively long, enabling the flip-top to flip beyond 180°. However, the connecting band possesses a certain elasticity and maintains a position beyond 180°. During drinking, the user has to press down the flip-top with one hand, which is relatively troublesome to use.

[0005] The third type involves arranging a circumferential tear line and a short tear line, with two pairs of axial cuts (two cuts per pair) disposed therebetween. After the circumferential and short tear lines break, portions between the cuts form two connecting bands and there is a certain distance between the two connecting bands. After the flip-top is opened, a contact portion between the cap base and the flip-top located between the two connecting bands is compressed and deformed, enabling the flip-top to remain in a position beyond 180°. However, when the flip-top is flipped back onto the bottle mouth, due to tension of the two connecting bands, interference from misalignment occurs between edges of the flip-top and the cap base. Coupled with a stopper structure on the flip-top, it becomes inconvenient to flip the flip-top back onto the bottle mouth, and the ease of use is also compromised.

[0006] Furthermore, some flip-top bottle caps typically consist of two parts: a cap base and a flip-top, where the flip-top is connected to the cap base via a flexible connecting band. The connecting band generally has two types of structures. One type incorporates a crease structure in the middle of the connecting band, and when the flip-top is closed, the connecting band folds along the crease structure. For bottle caps employing a connecting band with this design, due to inherent structural limitations, the maximum opening angle of the flip-top is typically around 135° to 150°. Consequently, when a user consumes a product with such a cap, the cap often comes into direct contact with the user's face, particularly during drinking by tilting the bottle completely or nearly completely upright. The other type is provided without a crease structure. When the flip-top is closed, this type of connecting band assumes a "U" shape. Once the flip-top is opened, the connecting band becomes straightened (or nearly straightened). However, before the product is sold, the flip-top remains in the closed state for a long time, which may cause the connecting band to develop a certain degree of permanent deformation. Therefore, the connecting band exhibits a certain resilience, causing the flip-top to rebound. This directly impacts the user experience, for example, the flip-top may rebound and slap the user's face.

[0007] Accordingly, the present application is proposed to address the aforementioned problems.SUMMARY

[0008] The purpose of the present application is to overcome the shortcomings of the prior art by providing a flip-top retention structure for a bottle cap. The flip-top retention structure is capable of ensuring the flip-top remains in an open state, preventing the flip-top from touching the user's mouth or nose during drinking and thereby avoiding interference with the drinking process. It features ease of use, a simple structure, convenient opening, and easy re-closing.

[0009] The present application is implemented through the following technical solutions: the present application provides a flip-top retention structure for a bottle cap, including an integrally-formed cap body, where the cap body is provided with a long tear line and a short tear line along a circumferential direction, both ends of the long tear line are provided with inner-side cuts along an axial direction of the cap body, and both ends of the short tear line are provided with outer-side cuts along the axial direction of the cap body; after the long tear line and the short tear line are broken, portions above the long tear line and the short tear line constitute the flip-top, portions below the long tear line and the short tear line constitute the cap base, and portions between the inner-side cuts and the outer-side cuts constitute the connecting band; when the flip-top is flipped 180°, a contact portion is formed between the cap base and the flip-top, and tension of the connecting band causes the contact portion to generate elastic deformation, or the connecting band is stretched to generate elastic deformation; and when the flip-top is flipped beyond 180°, the contact portion or the connecting band rebounds, causing the flip-top to be in a force-retained state.

[0010] The present application further provides a flip-top retention structure for a bottle cap, including an integrally-formed cap body, where the cap body is provided with a connecting tear line having an opening, and a folding crease along a circumferential direction; both ends of the folding crease are connected to two ends of the connecting tear line; after the connecting tear line is broken, a portion above the connecting tear line constitutes a flip-top, a portion below the connecting tear line constitutes a cap base, and the folding crease forms a connecting band connecting the flip-top and the cap base; when the flip-top is flipped beyond 180° along the folding crease, portions on both sides of the connecting band are stretched to generate inward tension, and the inward tension causes a contact portion between the flip-top and the cap base to be compressed, generating elastic deformation of greater than 0.5 mm, and simultaneously causes a middle portion of the connecting band to be arched upward, generating outward tension, thereby maintaining the flip-top in an open state.

[0011] The present application further provides a flip-top retention structure for a bottle cap, including an integrally-formed cap body, where the cap body is provided with a connecting tear line having an opening, and a folding crease along a circumferential direction; two axial fracture portions are respectively disposed between each end of the folding crease and a corresponding end of the connecting tear line; after the connecting tear line is broken, a portion above the connecting tear line constitutes a flip-top, a portion below the connecting tear line constitutes a cap base, a portion between the two fracture portions forms a cap band connecting the flip-top and the cap base, and the folding crease forms a connecting band connecting the flip-top and the cap base; when the flip-top is flipped beyond 180°, the cap band is stretched to generate inward tension, and the inward tension causes a contact portion between the flip-top and the cap base to be compressed, generating elastic deformation of greater than 0.5 mm, and simultaneously causes the connecting band to be arched upward, generating outward tension, thereby maintaining the flip-top in an open state.

[0012] A middle portion of the long tear line has a downward-bent bending portion, causing a lower edge of the flip-top to form a downward-protruding plate.

[0013] A folding groove is disposed between an upper end of the plate and the flip-top. The folding groove has a V-shaped cross-section.

[0014] A sealing plug is disposed on an inner side of a top portion of the flip-top. An inclined evasion surface is disposed on a portion of the sealing plug corresponding to the plate. A downward-protruding guiding portion is disposed on a portion of the sealing plug distal from the plate. A sealing ring is disposed on an outer surface of the sealing plug.

[0015] The short tear line is located on a top surface of the cap body, and / or an upper end of the connecting band extends to a top surface of the flip-top.

[0016] The flip-top has a smaller diameter than the cap base, the long tear line is formed by a thin-walled portion between the cap base and the flip-top, and the short tear line is formed by a thin-walled portion between the cap base and the flip-top.

[0017] A downward-protruding guiding portion is disposed on a side portion of the sealing plug proximate to the folding crease.

[0018] The connecting band consists of a lower connecting band body and an upper connecting band body; a lower end of the lower connecting band body is connected to the cap base, while an upper end of the upper connecting band body is connected to the flip-top; and the folding crease is located at a junction between the lower connecting band body and the upper connecting band body.

[0019] The flip-top has a smaller diameter than the cap base, and the folding crease is a thin-walled portion between the cap base and the flip-top.

[0020] The present application further provides a bottle employing the flip-top retention structure for a bottle cap as described above, including a bottle body, where a bottle mouth of the bottle body is provided with male threads; a support block is disposed on an inner side of the plate; and after the cap body is assembled onto the bottle mouth, a lower surface of the support block abuts against an upper surface of the male threads. The support block is located entirely or partially below the folding groove.

[0021] The present application further provides a bottle employing the flip-top retention structure for a bottle cap as described above, including a bottle body, where a bottle mouth of the bottle body is provided with male threads; an upper protruding ring and a lower protruding ring are disposed on a lower portion of the male threads; a limiting groove is formed between the upper protruding ring and the lower protruding ring; an inner wall on a lower side of the cap body is provided with a limiting block which, after the cap body is assembled onto the bottle mouth, is located on an inner side of the limiting groove; when the cap body is rotated forward such that the limiting block is blocked by the lower protruding ring, the inner side of the top portion of the flip-top seals the bottle mouth; and when the cap body is rotated reversely such that the limiting block is blocked by the upper protruding ring, the inner side of the top portion of the flip-top separates from an upper end wall of the bottle mouth, thereby forming a pressure relief gap.

[0022] A sealing plug is disposed on the inner side of the top portion of the flip-top; when the cap body is rotated forward such that the limiting block is blocked by the lower protruding ring, the sealing plug is entirely inserted into the bottle mouth to form a seal; and when the cap body is rotated reversely such that the limiting block is blocked by the upper protruding ring, the sealing plug partially disengages from the bottle mouth, forming the pressure relief gap between the sealing plug and the bottle mouth.

[0023] A flip-top retention structure for a bottle cap, including a cap base and a flip-top, where symmetrical connecting bands are disposed between the cap base and the flip-top; an upwardly protruding vertical tab portion is disposed on the cap base located between the connecting bands; a spring tab portion is disposed on the vertical tab portion; and after the cap base is screwed onto a bottle, the spring tab portion tightly fits against a bottle mouth.

[0024] A pick portion is disposed on the flip-top corresponding to the spring tab portion; and when the flip-top is flipped, the pick portion flicks the spring tab portion, thereby generating an audible sound.

[0025] When the flip-top is closed, the pick portion is located above the spring tab portion; an edge of the pick portion is flush with an outer side wall of the spring tab portion, or the edge of the pick portion protrudes beyond the outer side wall of the spring tab portion.

[0026] The present application further provides a flip-top retention structure for a bottle cap, including a cap base and a flip-top, where the cap base and the flip-top are connected by a connecting band; the connecting band is provided with at least one crease group consisting of at least two creases, causing the connecting band to form at least a three-segment structure; cap bands are disposed on both sides of the connecting band; both ends of the cap bands are respectively connected to the cap base and the flip-top; and when the flip-top is opened, the connecting band folds along the crease group, and the flip-top is restrained via the cap bands, thereby securing the flip-top.

[0027] The crease group consists of a first crease proximate to the flip-top and a second crease proximate to the cap base; and the first crease and the second crease partition the connecting band into an upper connecting band body connected to the flip-top, a lower connecting band body connected to the cap base, and a middle connecting band body located between the first crease and the second crease.

[0028] A thickness of the upper connecting band body gradually decreases from the flip-top towards the first crease; and / or, a thickness of the lower connecting band body gradually decreases from the cap base towards the second crease; and / or, a thickness of the middle connecting band body gradually increases from the first crease and the second crease on both sides towards a middle portion.

[0029] A junction between the connecting band and the flip-top is located at an upper end, a middle portion, or a lower end of the flip-top; and / or, a junction between the connecting band and the cap base is located at an upper end, a middle portion, or a lower end of the cap base.

[0030] The cap bands and the connecting band are an integral structure; and / or, the cap bands and the connecting band are separate structures, and a gap slot is disposed between the cap bands and the connecting band.

[0031] The connecting band and / or the cap bands are curved structures.

[0032] Compared with the prior art, the present application has the following advantages: 1. By configuring the lengths and positions of the inner-side cuts and the outer-side cuts, the contact portion is formed between the cap base and the flip-top when the flip-top is flipped 180°; the tension of the connecting band causes the contact portion to generate elastic deformation, or the connecting band is stretched to generate elastic deformation; and after the flip-top is flipped beyond 180°, the contact portion or the connecting band rebounds, causing the flip-top to be maintained in a force-retained state. This ensures the flip-top remains in an open state, preventing the flip-top from touching a user's mouth or nose during drinking and thereby avoiding interference with the drinking process. It features ease of use and convenient opening. Furthermore, the structure of the bottle cap is simplified, further reducing the difficulty of molding and production. 2. The folding groove is disposed between the upper end of the plate and the flip-top, and the support block is disposed on the inner side of the plate. After the cap body is assembled onto the bottle mouth, the lower surface of the support block abuts against the upper surface of the male threads on the bottle mouth. During opening, the plate is bent along the folding groove, and the support block rotates on the upper surface of the male threads. Based on the lever principle, this applies an upward force to the flip-top, causing partial breakage of the long tear line. Subsequently, only a small force is required to completely break the long tear line, facilitating opening. 3. The folding crease does not break after the flip-top is opened. During the process of re-closing the flip-top onto the bottle mouth, there is no interference from misalignment between the edges of the flip-top and the cap base. While the flip-top is maintained in an open state, the problem of interference during re-closing is also solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings. FIG. 1 is a first schematic structural view of Embodiment 1 of the present application; FIG. 2 is a second schematic structural view of Embodiment 1 of the present application; FIG. 3 is a schematic structural view when the flip-top shown in FIG. 1 is flipped 180°; FIG. 4 is a schematic structural view when the flip-top shown in FIG. 1 is flipped beyond 180°; FIG. 5 is a sectional view after the bottle cap shown in FIG. 1 is assembled onto a bottle mouth; FIG. 6 is a schematic structural view of Embodiment 2 of the present application; FIG. 7 is a sectional view of the bottle cap shown in FIG. 6; FIG. 8 is a schematic structural view of Embodiment 3 of the present application; FIG. 9 is a sectional view in a sealed state after the bottle cap shown in FIG. 8 is assembled onto a bottle mouth; FIG. 10 is a sectional view in a pressure relief state after the bottle cap shown in FIG. 8 is assembled onto a bottle mouth; FIG. 11 is a schematic structural view of a bottle body; FIG. 12 is a schematic structural view of Embodiment 4 of the present application; FIG. 13 is a schematic structural view when the flip-top shown in FIG. 12 is flipped beyond 180°; FIG. 14 is a schematic structural view of Embodiment 5 of the present application; FIG. 15 is a schematic structural view when the flip-top shown in FIG. 14 is flipped beyond 180°; FIG. 16 is a sectional view of Embodiment 6 of the present application; FIG. 17 is a schematic view of a usage state of Embodiment 7 of the present application; FIG. 18 is a perspective structural view of Embodiment 8 of the present application; FIG. 19 is a schematic view of a usage state of Embodiment 8 of the present application; FIG. 20 is a sectional view of Embodiment 8 of the present application; FIG. 21 is an enlarged schematic view of A shown in FIG. 20; FIG. 22 is a schematic view of a usage state of Embodiment 9 of the present application; FIG. 23 is a schematic view of a usage state of Embodiment 10 of the present application; FIG. 24 is a schematic view of a usage state of Embodiment 11 of the present application; and FIG. 25 is a schematic view of a usage state of Embodiment 12 of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Embodiments of the present application will be described in detail below with reference to FIGs. 1 to 25.

[0035] As shown in FIGs. 1 to 11, the present application provides a flip-top retention structure for a bottle cap, including an integrally formed cap body 1. The cap body 1 is integrally injection-molded from a plastic material having a certain elasticity. The cap body 1 is provided with a long tear line 11 and a short tear line 12 along a circumferential direction, both ends of the long tear line 11 are provided with inner-side cuts 111 along an axial direction of the cap body 1, and both ends of the short tear line 12 are provided with outer-side cuts 121 along the axial direction of the cap body 1. In the present application, the circumferential direction refers to a direction along the circumferential surface, which may be a curved line located in the same plane or an irregular-shaped line with upward or downward bending portions not in the same plane. The axial direction is relative to the circumferential direction, and it may be a direction parallel to the axis of the bottle cap or an inclined direction forming a certain angle. The long tear line and the short tear line may be creases or dotted-line cuts.

[0036] As shown in FIGs. 1 to 10, after the long tear line 11 and the short tear line 12 are broken, portions above the long tear line 11 and the short tear line 12 constitute a flip-top 3, portions below the long tear line 11 and the short tear line 12 constitute a cap base 2, and portions between the inner-side cuts 111 and the outer-side cuts 121 constitute a connecting band 4; when the flip-top 3 is flipped 180°, a contact portion is formed between the cap base 2 and the flip-top 3, and tension of the connecting band 4 causes the contact portion to generate elastic deformation, or the connecting band 4 is stretched to generate elastic deformation; and when the flip-top 3 is flipped beyond 180°, the contact portion or the connecting band 4 rebounds, causing the flip-top 3 to be in a force-retained state, preventing the flip-top from touching a user's mouth or nose during drinking and thereby avoiding interference with the drinking process. It features ease of use and convenient opening. Furthermore, by configuring the lengths and positions of the inner-side cuts and the outer-side cuts, the present application causes the flip-top to be maintained in a force-retained state after being flipped beyond 180°, simplifies the structure of the bottle cap, and further reduces the difficulty of molding and production.

[0037] Further, the inner-side cuts 111 have a greater length than the outer-side cuts 121. That is, one side of the connecting band 4 proximate to the outer-side cuts 121 is shorter, while the other side proximate to the inner-side cuts 111 is longer. When the flip-top 3 is opened to forcibly stretch the connecting band 4, the shorter side of the connecting band 4 undergoes less elongation compared to the other side. This causes the shorter side of the connecting band 4 to limit a separation distance between the flip-top 3 and the cap base 2 when they are opened, preventing excessive separation that could lead to unstable positioning of an edge of the flip-top 3 located between the connecting bands 4 during flipping. For example, upon one opening of the flip-top 3, this position is flipped inside the bottle mouth; upon the next opening, the flip-top 3 is flipped outside the cap base 2, serving a positioning function. Meanwhile, the longer side of the connecting band 4 serves to increase the length of the connecting band 4, thereby enhancing the maximum length of the connecting band 4 that can be forcibly stretched to avoid breakage.

[0038] The bottle cap is circular. By reasonably configuring the lengths and positions of the inner-side cuts 111 and the outer-side cuts 121, generally, the distance between the inner-side cuts 111 and the outer-side cuts 121 should be greater than 1 mm. The lengths of the inner-side cuts 111 and the outer-side cuts 121 may be the same or slightly different, and their shapes may be axial straight-line segments, inclined lines forming a certain angle with the axis, or curves of any shape. When the flip-top 3 is flipped 180°, portions outside the inner-side cuts 111 form arcs. If the length of the cuts is 0.1 to 5 mm less than a combined height of the arcs of the flip-top 3 and the cap base 2, a contact portion can be formed between the cap base 2 and the flip-top 3.

[0039] For example: in a first scenario, the material of the cap base 2 and the flip-top 3 is relatively thin and soft, causing elastic deformation at the contact portion between the cap base 2 and / or the flip-top 3. That is, the tension of the connecting band 4 causes the contact portion to generate elastic deformation (the slight stretching of the connecting band 4 can be ignored). When the flip-top 3 is flipped 180°, the contact portion and the connecting band 4 are essentially in the same plane. After the flip-top 3 is flipped beyond 180°, the contact portion shifts above the connecting band 4. Upon release, the contact portion rebounds, enabling the flip-top 3 to be maintained in a force-retained state.

[0040] In a second scenario, the cap base 2 and the flip-top 3 are relatively thick and rigid, making deformation difficult. In this case, the connecting band 4 may be made thinner to possess elasticity. When the flip-top 3 is flipped 180°, the connecting band 4 is stretched to generate elastic deformation (the slight deformation of the cap base 2 and the flip-top 3 can be ignored). After the flip-top 3 is flipped beyond 180° and released, the connecting band 4 rebounds, thereby causing the flip-top 3 to be maintained in a force-retained state.

[0041] In other embodiments, the structure includes a cap base 2 and a flip-top 3, where a connecting band 4 is disposed between the cap base 2 and the flip-top 3; when the flip-top 3 is flipped 180°, a contact portion is formed between the cap base 2 and the flip-top 3, and tension of the connecting band 4 causes the contact portion to generate elastic deformation, or the connecting band 4 is stretched to generate elastic deformation; and when the flip-top 3 is flipped beyond 180°, the contact portion or the connecting band 4 rebounds, causing the flip-top 3 to be in a force-retained state. For this structure, although the cap base 2, the flip-top 3, and the connecting band 4 are simultaneously injection-molded, the cap base 2 and the flip-top 3 are relatively independent of each other, and there are no other connecting portions between them except for the connecting band 4. In this structure, the flip-top 3 may have a greater diameter than the cap base 2; when closed, the flip-top 3 is directly sleeved onto the cap base 2. Alternatively, an inwardly recessed step portion may be disposed at an upper end of the cap base 2, and the flip-top 3 is sleeved onto the step portion when closed. Furthermore, a snap-fit structure may be disposed between the flip-top 3 and the cap base 2, or between the flip-top 3 and the step portion, to maintain them in a snap-fitted state.

[0042] A middle portion of the long tear line 11 has a downward-bent bending portion 21, causing a lower edge of the flip-top 3 to form a downward-protruding plate 31. The bending portion 21 is preferably a through-cut to facilitate the opening of the plate 31; the portions of the long tear line 11 located below and on both sides of the plate 31 are preferably through-cuts; and the portion below the plate 31 should have a certain width and be provided with an inclined surface to facilitate opening.

[0043] A folding groove 32 is disposed between an upper end of the plate 31 and the flip-top 3. By prying outward from a lower end of the plate 31, the plate 31 is bent along the folding groove 32, facilitating opening. The folding groove 32 has a V-shaped cross-section, and the angle of the two side surfaces of the folding groove 32 can define the bending angle of the plate 31 along the folding groove 32. For example, the angle of inclination of the two side surfaces may be 10-65°, enabling the plate 31 to bend 20-130° along the folding groove 32.

[0044] A sealing plug 33 is disposed on an inner side of a top portion of the flip-top 3. After being assembled onto a bottle mouth, the sealing plug 33 is inserted into the bottle mouth to enhance the sealing effect. To facilitate the insertion and removal of the sealing plug from the bottle mouth, its height cannot be very large, as shown in FIG. 8.

[0045] An inclined evasion surface 331 is disposed on a portion of the sealing plug 33 corresponding to the plate 31, facilitating the sealing plug 33 to be inserted into or removed from the bottle mouth.

[0046] A downward-protruding guiding portion 332 is disposed on a portion of the sealing plug 33 distal from the plate 31; when the flip-top is flipped approximately 90°, the end of the guiding portion 332 is already positioned above the bottle mouth. If the flipping continues, the guiding portion 332 will first slide into the bottle mouth, ensuring that misalignment is less likely to occur when the flip-top is closed. Further, either the inclined evasion surface 331 or the guiding portion 332 may be arranged alone, or both may be arranged for a better effect.

[0047] To further improve sealing performance, a sealing ring 333 is disposed on an outer surface of the sealing plug 33.

[0048] As shown in FIGs. 6 and 7, the flip-top 3 has a smaller diameter than the cap base 2, presenting an overall inverted T-shape. A thin-walled portion is formed between a lower end of the flip-top 3 and the upper end of the cap base 2. The long tear line 11 is formed by the thin-walled portion between the cap base 2 and the flip-top 3, and the short tear line 12 may also be formed by the thin-walled portion between the cap base 2 and the flip-top 3. This bottle cap structure is easier to demold and does not require secondary processing for the long tear line 11 and the short tear line 12.

[0049] As shown in FIG. 16, the short tear line 12 is located on a top surface of the cap body 1, and an upper end of the connecting band 4 extends to a top surface of the flip-top 3. When the flip-top 3 is flipped, a certain force must be applied to forcibly flip the flip-top 3 backward, causing the connecting band 4 to be forcibly stretched to some extent. By extending the upper end of the connecting band 4 to the top surface of the flip-top 3, the length of the connecting band 4 can be increased, thereby increasing the maximum length to which the connecting band 4 can be forcibly stretched and preventing the connecting band 4 from being broken. When the flip-top 3 is flipped to 180° or even 220°, a contact portion is formed between the cap base 2 and the flip-top 3. Upon release, the connecting band 4 retracts, creating a tendency for the cap base 2 and the flip-top 3 to move closer to each other. This increases the frictional force at the contact portion between the cap base 2 and the flip-top 3, causing the cap base 2 and the flip-top 3 to abut against each other and become fixed. Without an external force, the flip-top will not return to a state less than 180°, thereby preventing the flip-top 3 from rebounding and hitting the consumer's nose or face during drinking. Only when the flip-top 3 is pressed by an external force and the connecting band 4 is forcibly stretched again, will the flip-top 3 return to a state less than 180° and get re-closed.

[0050] As shown in FIGs. 12 and 13, a flip-top retention structure for a bottle cap according to the present application includes a circular cap body 1 integrally formed by injection molding, vacuum forming, or blow molding from plastic material, where the cap body 1 is provided with a connecting tear line 13 having an opening, which may be a dotted-line cut or continuous / discontinuous indentations; the cap body 1 is further provided with a folding crease 14 along a circumferential direction, which may be a single line or two or more parallel lines; both ends of the folding crease 14 are connected to two ends of the connecting tear line 13; after the connecting tear line 13 is broken, a portion above the connecting tear line 13 constitutes a flip-top 3, a portion below the connecting tear line 13 constitutes a cap base 2, and the folding crease 14 forms a connecting band 4 connecting the flip-top 3 and the cap base 2; when the flip-top 3 is flipped beyond 180° along the folding crease 14, portions on both sides of the connecting band 4 are stretched to generate inward tension, and the inward tension causes a contact portion between the flip-top 3 and the cap base 2 to be compressed, generating elastic deformation of greater than 0.5 mm, and simultaneously causes a middle portion of the connecting band 4 to be arched upward, generating outward tension, thereby maintaining the flip-top 3 in an open state. The larger the arc length of the folding crease 14, the greater the deformation generated by compression at the contact portion between the flip-top 3 and the cap base 2, and consequently the greater the rebound force. The folding crease does not break after the flip-top is opened, and during the process of re-closing the flip-top onto the bottle mouth, there is no interference from misalignment between the edges of the flip-top and the cap base. By reasonably configuring the arc length of the folding crease 14 according to the size of the bottle cap, the bottle cap can be easily opened to achieve flip-top retention while also facilitating re-closing.

[0051] As shown in FIGs. 14 and 15, a flip-top retention structure for a bottle cap according to the present application includes a circular cap body 1 integrally formed by injection molding, vacuum forming, or blow molding from plastic material, where the cap body 1 is provided with a connecting tear line 13 having an opening, which may be a dotted-line cut or continuous / discontinuous indentations; the cap body 1 is further provided with a folding crease 14 along a circumferential direction, which may be a single line or two or more parallel lines; two axial fracture portions 15 are respectively disposed between each end of the folding crease 14 and a corresponding end of the connecting tear line 13, and the axial fracture portions 15 may be through-holes or non-through cuts; after the connecting tear line 13 is broken, a portion above the connecting tear line 13 constitutes a flip-top 3, a portion below the connecting tear line 13 constitutes a cap base 2, a portion between the two fracture portions 15 forms a cap band 5 connecting the flip-top 3 and the cap base 2, and the folding crease 14 forms a connecting band 4 connecting the flip-top 3 and the cap base 2; when the flip-top 3 is flipped beyond 180°, the cap band 5 is stretched to generate inward tension, and the inward tension causes a contact portion between the flip-top 3 and the cap base 2 to be compressed, generating elastic deformation of greater than 0.5 mm, and simultaneously causes the connecting band 4 to be arched upward, generating outward tension, thereby maintaining the flip-top 3 in an open state. The smaller the height of the fracture portions 15, the greater the tension generated; the larger the arc length of the folding crease 14, the greater the deformation generated by compression at the contact portion between the flip-top 3 and the cap base 2, and consequently the greater the rebound force. The folding crease does not break after the flip-top is opened, and during the process of re-closing the flip-top onto the bottle mouth, there is no interference from misalignment between the edges of the flip-top and the cap base. By reasonably configuring the arc length of the folding crease 14 and the height of the fracture portions 15 according to the size of the bottle cap, the bottle cap can be easily opened to achieve flip-top retention while also facilitating re-closing.

[0052] As shown in FIGs. 12 to 15, a sealing plug 33 is disposed on an inner side of a top portion of the flip-top 3, and a downward-protruding guiding portion 332 is disposed on a side portion of the sealing plug 33 proximate to the folding crease 14. During the re-closing process, the guiding portion 332 first extends into the bottle mouth, facilitating the complete insertion of the sealing plug 33 into the bottle mouth. A sealing ring 333 is disposed on an outer surface of the sealing plug 33, and the contact between the sealing ring 333 and an inner wall of the bottle mouth is tighter, providing a better sealing effect.

[0053] The flip-top 3 may have the same diameter as the cap base 2, presenting an overall cylindrical shape. Alternatively, the flip-top 3 may have a smaller diameter than the cap base 2, presenting an overall stepped shape. The folding crease 14 is formed by a thin-walled portion between the cap base 2 and the flip-top 3.

[0054] As shown in FIGs. 12 to 15, the connecting band 4 consists of a lower connecting band body 41 and an upper connecting band body 42; a lower end of the lower connecting band body 41 is connected to the cap base 2, while an upper end of the upper connecting band body 42 is connected to the flip-top 3; and the folding crease 14 is located at a junction between the lower connecting band body 41 and the upper connecting band body 42. As shown in FIG. 15, when the flip-top 3 is opened by an external force to approximately 180°, under tension of the two cap bands 5, a forcibly intersecting force occurs between the lower connecting band body 41 and the upper connecting band body 42. Since the lower connecting band body 41 and the upper connecting band body 42 are connected together, they will not intersect. Due to the forcibly backward flipping of the flip-top 3, the folding angle between the lower connecting band body 41 and the upper connecting band body 42 exceeds 180°. At this point, once the flip-top 3 is released, due to the restraining effect of the cap bands 5, the lower connecting band body 41 and the upper connecting band body 42 are caused to remain at an angle greater than 180°. When the flip-top 3 needs to be closed, the cap bands 5 are stretched again, and the lower connecting band body 41 and the upper connecting band body 42 are folded back to a state less than 180°. Since the thickness of the lower connecting band body 41 gradually decreases from the cap base 2 towards the flip-top 3, and the thickness of the upper connecting band body 42 gradually decreases from the flip-top 3 towards the cap base 2, when the flip-top 3 is opened to more than 180°, the lower connecting band body 41 and the upper connecting band body 42 more easily deform. This enables the lower connecting band body 41 and the upper connecting band body 42 to fold more smoothly beyond 180°.

[0055] As shown in FIG. 17, a flip-top retention structure for a bottle cap includes a cap base 2 and a flip-top 3, where symmetrical connecting bands 4 are disposed between the cap base 2 and the flip-top 3; an upwardly protruding vertical tab portion 23 is disposed on the cap base 2 located between the connecting bands 4; a spring tab portion 231 is disposed on the vertical tab portion 23; and after the cap base 2 is screwed onto a bottle, the spring tab portion 231 tightly fits against a bottle mouth. When the flip-top 3 is flipped, it rotates along the outer side of the spring tab portion, thereby preventing the edge of the flip-top 3 from inserting between the spring tab portion and the bottle mouth. This avoids the flip-top 3 becoming stuck, which could lead to failure in closing or opening.

[0056] As shown in FIG. 17, a pick portion 24 is disposed on the flip-top 3 corresponding to the spring tab portion 231, extending the outer edge of the flip-top 3. When the flip-top 3 is flipped, the pick portion rotates along the outer side of the spring tab portion, further preventing the edge of the flip-top 3 from inserting between the spring tab portion and the bottle mouth. Moreover, during the flipping process of the flip-top 3, the pick portion 24 flicks the spring tab portion 231, thereby generating an audible sound. This sound serves as a warning, indicating that the flip-top 3 has reached the maximum designed flipping angle and, if it is further flipped, the bottle cap may be damaged.

[0057] When the flip-top 3 is closed, the pick portion 24 is located above the spring tab portion 231; an edge of the pick portion 24 is flush with an outer side wall of the spring tab portion 231, or the edge of the pick portion 24 protrudes beyond the outer side wall of the spring tab portion 231. This ensures that when the flip-top 3 is opened, the pick portion can rotate along the outer side of the spring tab portion, and when the flip-top 3 is closed, the pick portion does not interfere with the spring tab portion. For example, when the bottle cap has a large diameter, its overall strength decreases (i.e., a bottle cap with a larger diameter is more prone to deformation compared to one with a smaller diameter). This causes the spring tab portion to bend outward and separate from the bottle mouth, with the edge of the pick portion abutting against the inner side wall of the spring tab portion. When opened next time, the edge of the pick portion directly inserts into the gap between the spring tab portion and the bottle mouth.

[0058] As shown in FIGs. 18 to 25, a flip-top retention structure for a bottle cap according to the present application includes a cap base 2 and a flip-top 3, where the cap base 2 and the flip-top 3 are connected by a connecting band 4; the connecting band 4 is provided with at least one crease group consisting of at least two creases, causing the connecting band 4 to form at least a three-segment structure; cap bands 5 are disposed on both sides of the connecting band 4; both ends of the cap bands 5 are respectively connected to the cap base 2 and the flip-top 3; and when the flip-top 3 is opened, the connecting band 4 folds along the crease group, and the flip-top 3 is restrained via the cap bands 5, thereby securing the flip-top 3. When the flip-top is opened, the connecting band folds along the crease group, and the flip-top is restrained via the cap bands 5, thereby securing the flip-top. This effectively solves the problem of the connecting band's resilience causing the flip-top to slap the user's face. Simultaneously, it greatly increases the opening angle of the flip-top to approximately 270° (as shown in FIGs. 23 to 25). This easily resolves the issue of direct contact between the flip-top and the user's face during drinking.

[0059] As shown in FIG. 21, the crease group consists of a first crease 401 proximate to the flip-top 3 and a second crease 402 proximate to the cap base 2; and the first crease 401 and the second crease 402 partition the connecting band 4 into an upper connecting band body 42 connected to the flip-top 3, a lower connecting band body 41 connected to the cap base 2, and a middle connecting band body 43 located between the first crease 401 and the second crease 402. The first crease 401 and the second crease 402 may be narrow linear grooves or relatively wider groove structures; alternatively, the first crease 401 and the second crease 402 may be straight-line structures or curved-line structures. Furthermore, the first crease 401 and the second crease 402 may be even wider groove structures, such that the first crease 401 and the second crease 402 are connected to form a single crease.

[0060] When the flip-top 3 is opened by an external force to approximately 180°, the connecting band 4 changes from a folded state (i.e., the state when the flip-top 3 is closed) to a straightened state. Since the cap bands 5 restrict the range of motion of the flip-top 3, when the flip-top 3 is opened to approximately 150°, the cap bands 5 are in the straightened state, thereby restricting further backward flipping of the flip-top 3. At this point, a greater force must be applied to forcibly stretch the cap bands 5, enabling the flip-top 3 to continue flipping backward. When the flip-top 3 is opened to 180°, the cap bands 5 are stretched to their longest state (when stretched to this state, the cap bands 5 still have room for further elongation within the elastic deformation range, preventing them from failing to retract after being stretched). Therefore, within the range of 150° to 180°, since the connecting band 4 as a whole remains unbroken, the middle portion of the connecting band 4 enters a state of relative compression (i.e., the upper connecting band body 42 moves toward the lower connecting band body 41, the lower connecting band body 41 moves toward the upper connecting band body 42, and the middle connecting band body 43, the first crease 401, and the second crease 402 change accordingly). The thickness of the upper connecting band body 42 gradually decreases from the flip-top 3 toward the first crease 401, and the thickness of the lower connecting band body 41 gradually decreases from the cap base 2 toward the second crease 402. This makes the upper connecting band body 42 and the lower connecting band body 41 more prone to deformation, thereby making it easier for the flip-top 3 to be flipped beyond 180°.

[0061] When the flip-top 3 is opened beyond 180°, the cap bands 5 retract, causing the flip-top 3 to be further flipped backward until the cap bands 5 retract to their initial state. At this point, the flip-top 3 is in its normally open state (as shown in FIGs. 23 to 25).

[0062] The thickness of the middle connecting band body 43 gradually increases from the first crease 401 and the second crease 402 on both sides toward the middle, enhancing the strength of the middle connecting band body 43. This prevents irreversible deformation of the middle connecting band body 43 when the flip-top 3 is within the range of 150° to 180° and the upper connecting band body 42 and the lower connecting band body 41 compress each other, which could affect the opening and closing of the flip-top 3. For example, if the middle connecting band body 43 is compressed and forms an arch in the middle portion, this will cause the distance between the first crease 401 and the second crease 402 to shorten, thereby shortening the overall length of the connecting band 4 and preventing the flip-top 3 from being smoothly closed.

[0063] When the flip-top 3 is opened, the two opening sides of the first crease 401 and the second crease 402 move closer together until they abut, defining the maximum opening angle of the flip-top 3. The sides of the first crease 401 and the second crease 402 may be perpendicular to the bottom of the crease or form an obtuse or acute angle with the bottom of the crease. When an obtuse angle is formed, the distance for the two opening sides of the creases to move closer together until they abut is greater, resulting in a larger angle for the flip-top 3; conversely, when an acute angle is formed, the angle of the flip-top 3 is smaller. Specific adjustments may be made based on the actual bottle structure and usage range. For example, for condiment bottles where the flip-top 3 does not pose a risk of slapping the user's face, the opening angle of the flip-top 3 may be relatively smaller. For beverage bottles, the opening angle of the flip-top 3 may be relatively larger. Adjustments may also be made appropriately based on the diameter (width) of the bottle body. For example, for common commercially available mineral water bottles where the proportion between the bottle body and the bottle mouth is relatively small, the flip-top 3 does not abut against the bottle body when opened to approximately 270°. Conversely, when the proportion between the bottle body and the bottle mouth is relatively large, meaning the bottle body is wider, if the opening angle of the flip-top 3 is too large, the flip-top 3 may abut against the upper portion of the bottle body, preventing it from reaching the maximum opening angle and making it prone to rebound.

[0064] According to different bottle body structures, the dimensions of the upper connecting band body 42, the lower connecting band body 41, and the middle connecting band body 43 are adaptively changed, and the positional distance between the first crease 401 and the second crease 402 is specifically designed based on the structure of the bottle body.

[0065] Further, a junction between the connecting band 4 and the flip-top 3 is located at any one of an upper end, a middle portion, or a lower end of the flip-top 3.

[0066] The middle connecting band body 43 may have a uniform overall thickness, or the thickness at both ends may be greater than the middle portion, causing the middle connecting band body 43 to form a curved surface structure. The first crease 401 and the second crease 402 are relatively thinner positions of the connecting band 4.

[0067] As shown in FIG. 19, the cap bands 5 and the connecting band 4 are an integral structure, which is simpler.

[0068] As shown in FIG. 22, the cap bands 5 and the connecting band 4 are separate structures, and a gap slot is disposed between the cap bands 5 and the connecting band 4, separating them to avoid mutual interference when the flip-top 3 is opened. For example, when the flip-top 3 is opened, the cap bands 5 are forcibly stretched. If the cap bands 5 and the connecting band 4 were connected, the connecting band 4 would also be stretched simultaneously; moreover, since the cap bands 5 and the connecting band 4 would form a wider connecting band, the range of elastic deformation would be reduced, and there might even be a risk of direct breakage.

[0069] As shown in FIGs. 23 to 25, a junction between the connecting band 4 and the cap base 2 is located at any one of an upper end, a middle portion, or a lower end of the cap base 2.

[0070] The cap bands 5 are curved structures, which may have a single curve or consist of multiple mutually opposing curves, such as a wave structure. These curved structures may bend in a left-right direction or a front-back direction. By employing a curved shape, the length of the cap bands 5 is increased, allowing for further elongation.

[0071] The connecting band 4 is a curved structure, following the same principle as the curved structure of the cap bands 5. Moreover, the curved structure of the connecting band 4 is similar in shape to that of the cap bands 5, ensuring overall aesthetic consistency and avoiding scenarios where the cap bands 5 have a multi-layer wave structure while the connecting band 4 has a single curve structure.

[0072] As shown in FIGs. 5 and 8 to 11, a bottle employing the flip-top retention structure for a bottle cap as described above according to the present application includes a bottle body 100, where a bottle mouth of the bottle body 100 is provided with male threads 110; a support block 311 is disposed on an inner side of the plate 31, and the support block 311 is located entirely or partially below the folding groove 32. The "below" here refers to the support block 311 being entirely or partially located below a circumferential plane where the folding groove 32 lies. After the cap body 1 is assembled onto the bottle mouth, a lower surface of the support block 311 abuts against an upper surface of the male threads 110. When the plate 31 is bent approximately 90° along the folding groove 32 and then lifted upward further, based on the lever principle, an upward force is applied to the flip-top, causing partial breakage of the long tear line. Subsequently, only a small force is required to completely break the long tear line, facilitating opening.

[0073] As shown in FIGs. 5 and 8 to 11, to ensure safe use, a bottle employing the flip-top retention structure for a bottle cap as described above according to the present application includes a bottle body 100, where a bottle mouth of the bottle body 100 is provided with male threads 110; an upper protruding ring 120 and a lower protruding ring 130 are disposed on a lower portion of the male threads 110; a limiting groove is formed between the upper protruding ring 120 and the lower protruding ring 130; an inner wall on a lower side of the cap body 1 is provided with a limiting block 22 which, after the cap body 1 is assembled onto the bottle mouth, is located on an inner side of the limiting groove; when the cap body 1 is rotated forward such that the limiting block 22 is blocked by the lower protruding ring 130, the inner side of the top portion of the flip-top 3 seals the bottle mouth; and when the cap body 1 is rotated reversely such that the limiting block 22 is blocked by the upper protruding ring 120, the inner side of the top portion of the flip-top 3 separates from an upper end wall of the bottle mouth, thereby forming a pressure relief gap. A sealing plug 33 is disposed on the inner side of the top portion of the flip-top 3; when the cap body 1 is rotated forward such that the limiting block 22 is blocked by the lower protruding ring 130, the sealing plug 33 is entirely inserted into the bottle mouth to form a seal; and when the cap body 1 is rotated reversely such that the limiting block 22 is blocked by the upper protruding ring 120, the sealing plug 33 partially disengages from the bottle mouth, forming the pressure relief gap between the sealing plug 33 and the bottle mouth. This type of bottle is suitable for containing liquids such as carbonated beverages with gas. When the bottle is opened, the bottle cap should first be rotated to relieve pressure, avoiding liquid spraying during opening.

[0074] In other embodiments, a sealing plug 33 is disposed on the inner side of the top portion of the flip-top 3; a sealing ring 333 is disposed on an outer surface of the sealing plug 33, and the sealing ring 333 has a pressure relief bend that is bent upward; when the cap body 1 is rotated forward such that the limiting block 22 is blocked by the lower protruding ring 130, the sealing ring 333 is entirely inserted into the bottle mouth to form a seal; and when the cap body 1 is rotated reversely such that the limiting block 22 is blocked by the upper protruding ring 120, the pressure relief bend entirely or partially disengages from the bottle mouth, forming the pressure relief gap between the pressure relief bend and the bottle mouth.

Claims

1. A flip-top retention structure for a bottle cap, comprising a cap base (2) and a flip-top (3), wherein a connecting band (4) is disposed between the cap base (2) and the flip-top (3); when the flip-top (3) is flipped 180°, a contact portion is formed between the cap base (2) and the flip-top (3), and tension of the connecting band (4) causes the contact portion to generate elastic deformation, or the connecting band (4) is stretched to generate elastic deformation; and when the flip-top (3) is flipped beyond 180°, the contact portion or the connecting band (4) rebounds, causing the flip-top (3) to be in a force-retained state.

2. The flip-top retention structure for a bottle cap according to claim 1, further comprising an integrally-formed cap body (1), wherein the cap body (1) is provided with a long tear line (11) and a short tear line (12) along a circumferential direction, both ends of the long tear line (11) are provided with inner-side cuts (111) along an axial direction of the cap body (1), and both ends of the short tear line (12) are provided with outer-side cuts (121) along the axial direction of the cap body (1); and after the long tear line (11) and the short tear line (12) are broken, portions above the long tear line (11) and the short tear line (12) constitute the flip-top (3), portions below the long tear line (11) and the short tear line (12) constitute the cap base (2), and portions between the inner-side cuts (111) and the outer-side cuts (121) constitute the connecting band (4).

3. The flip-top retention structure for a bottle cap according to claim 2, wherein a middle portion of the long tear line (11) has a downward-bent bending portion (21), causing a lower edge of the flip-top (3) to form a downward-protruding plate (31).

4. The flip-top retention structure for a bottle cap according to claim 3, wherein a folding groove (32) is disposed between an upper end of the plate (31) and the flip-top (3).

5. The flip-top retention structure for a bottle cap according to claim 3, wherein a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3); or, a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3), and an inclined evasion surface (331) is disposed on a portion of the sealing plug (33) corresponding to the plate (31); or, a sealing plug (33) is provided on an inner side of a top portion of the flip-top (3), and a downward-protruding guiding portion (332) is disposed on a portion of the sealing plug (33) distal from the plate (31); or, a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3), and a sealing ring (333) is disposed on an outer surface of the sealing plug (33).

6. The flip-top retention structure for a bottle cap according to claim 2, wherein the short tear line (12) is located on a top surface of the cap body (1), and / or an upper end of the connecting band (4) extends to a top surface of the flip-top (3).

7. A flip-top retention structure for a bottle cap, comprising an integrally-formed cap body (1), wherein the cap body (1) is provided with a connecting tear line (13) having an opening, and a folding crease (14) along a circumferential direction; both ends of the folding crease (14) are connected to two ends of the connecting tear line (13); after the connecting tear line (13) is broken, a portion above the connecting tear line (13) constitutes a flip-top (3), a portion below the connecting tear line (13) constitutes a cap base (2), and the folding crease (14) forms a connecting band (4) connecting the flip-top (3) and the cap base (2); when the flip-top (3) is flipped beyond 180° along the folding crease (14), portions on both sides of the connecting band (4) are stretched to generate inward tension, and the inward tension causes a contact portion between the flip-top (3) and the cap base (2) to be compressed, generating elastic deformation of greater than 0.5 mm, and simultaneously causes a middle portion of the connecting band (4) to be arched upward, generating outward tension, thereby maintaining the flip-top (3) in an open state.

8. The flip-top retention structure for a bottle cap according to claim 7, wherein a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3); or, a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3), and a downward-protruding guiding portion (332) is disposed on a side portion of the sealing plug (33) proximate to the folding crease (14).

9. The flip-top retention structure for a bottle cap according to claim 7, wherein the connecting band (4) consists of a lower connecting band body (41) and an upper connecting band body (42); a lower end of the lower connecting band body (41) is connected to the cap base (2), while an upper end of the upper connecting band body (42) is connected to the flip-top (3); and the folding crease (14) is located at a junction between the lower connecting band body (41) and the upper connecting band body (42).

10. A flip-top retention structure for a bottle cap, comprising an integrally-formed cap body (1), wherein the cap body (1) is provided with a connecting tear line (13) having an opening, and a folding crease (14) along a circumferential direction; two axial fracture portions (15) are respectively disposed between each end of the folding crease (14) and a corresponding end of the connecting tear line (13); after the connecting tear line (13) is broken, a portion above the connecting tear line (13) constitutes a flip-top (3), a portion below the connecting tear line (13) constitutes a cap base (2), a portion between the two fracture portions (15) forms a cap band (5) connecting the flip-top (3) and the cap base (2), and the folding crease (14) forms a connecting band (4) connecting the flip-top (3) and the cap base (2); when the flip-top (3) is flipped beyond 180°, the cap band (5) is stretched to generate inward tension, and the inward tension causes a contact portion between the flip-top (3) and the cap base (2) to be compressed, generating elastic deformation of greater than 0.5 mm, and simultaneously causes the connecting band (4) to be arched upward, generating outward tension, thereby maintaining the flip-top (3) in an open state.

11. The flip-top retention structure for a bottle cap according to claim 10, wherein a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3); or, a sealing plug (33) is disposed on an inner side of a top portion of the flip-top (3), and a downward-protruding guiding portion (332) is disposed on a side portion of the sealing plug (33) proximate to the folding crease (14).

12. The flip-top retention structure for a bottle cap according to claim 10, wherein the connecting band (4) consists of a lower connecting band body (41) and an upper connecting band body (42); a lower end of the lower connecting band body (41) is connected to the cap base (2), while an upper end of the upper connecting band body (42) is connected to the flip-top (3); and the folding crease (14) is located at a junction between the lower connecting band body (41) and the upper connecting band body (42).

13. A bottle employing the flip-top retention structure for a bottle cap according to any one of claims 3 to 5, comprising a bottle body (100), wherein a bottle mouth of the bottle body (100) is provided with male threads (110); a support block (311) is disposed on an inner side of the plate (31); and after the cap body (1) is assembled onto the bottle mouth, a lower surface of the support block (311) abuts against an upper surface of the male threads (110).

14. A bottle employing the flip-top retention structure for a bottle cap according to any one of claims 2 to 12, comprising a bottle body (100), wherein a bottle mouth of the bottle body (100) is provided with male threads (110); an upper protruding ring (120) and a lower protruding ring (130) are disposed on a lower portion of the male threads (110); a limiting groove is formed between the upper protruding ring (120) and the lower protruding ring (130); an inner wall on a lower side of the cap body (1) is provided with a limiting block (22) which, after the cap body (1) is assembled onto the bottle mouth, is located on an inner side of the limiting groove; when the cap body (1) is rotated forward such that the limiting block (22) is blocked by the lower protruding ring (130), the inner side of the top portion of the flip-top (3) seals the bottle mouth; and when the cap body (1) is rotated reversely such that the limiting block (22) is blocked by the upper protruding ring (120), the inner side of the top portion of the flip-top (3) separates from an upper end wall of the bottle mouth, thereby forming a pressure relief gap.

15. The bottle according to claim 14, wherein a sealing plug (33) is disposed on the inner side of the top portion of the flip-top (3); when the cap body (1) is rotated forward such that the limiting block (22) is blocked by the lower protruding ring (130), the sealing plug (33) is entirely inserted into the bottle mouth to form a seal; and when the cap body (1) is rotated reversely such that the limiting block (22) is blocked by the upper protruding ring (120), the sealing plug (33) partially disengages from the bottle mouth, forming the pressure relief gap between the sealing plug (33) and the bottle mouth.

16. A flip-top retention structure for a bottle cap, comprising a cap base (2) and a flip-top (3), wherein symmetrical connecting bands (4) are disposed between the cap base (2) and the flip-top (3); an upwardly protruding vertical tab portion (23) is disposed on the cap base (2) located between the connecting bands (4); a spring tab portion (231) is disposed on the vertical tab portion (23); and after the cap base (2) is screwed onto a bottle, the spring tab portion (231) tightly fits against a bottle mouth.

17. The flip-top retention structure for a bottle cap according to claim 16, wherein a pick portion (24) is disposed on the flip-top (3) corresponding to the spring tab portion (231); and when the flip-top (3) is flipped, the pick portion (24) flicks the spring tab portion (231), thereby generating an audible sound.

18. The flip-top retention structure for a bottle cap according to claim 17, wherein when the flip-top (3) is closed, the pick portion (24) is located above the spring tab portion (231); an edge of the pick portion (24) is flush with an outer side wall of the spring tab portion (231), or the edge of the pick portion (24) protrudes beyond the outer side wall of the spring tab portion (231).

19. A flip-top retention structure for a bottle cap, comprising a cap base (2) and a flip-top (3), wherein the cap base (2) and the flip-top (3) are connected by a connecting band (4); the connecting band (4) is provided with at least one crease group consisting of at least two creases, causing the connecting band (4) to form at least a three-segment structure; cap bands (5) are disposed on both sides of the connecting band (4); both ends of the cap bands (5) are respectively connected to the cap base (2) and the flip-top (3); and when the flip-top (3) is opened, the connecting band (4) folds along the crease group, and the flip-top (3) is restrained via the cap bands (5), thereby securing the flip-top (3).

20. The flip-top retention structure for a bottle cap according to claim 19, wherein the crease group consists of a first crease (401) proximate to the flip-top (3) and a second crease (402) proximate to the cap base (2); and the first crease (401) and the second crease (402) partition the connecting band (4) into an upper connecting band body (42) connected to the flip-top (3), a lower connecting band body (41) connected to the cap base (2), and a middle connecting band body (43) located between the first crease (401) and the second crease (402).

21. The flip-top retention structure for a bottle cap according to claim 20, wherein a thickness of the upper connecting band body (42) gradually decreases from the flip-top (3) towards the first crease (401); and / or, a thickness of the lower connecting band body (41) gradually decreases from the cap base (2) towards the second crease (402); and / or, a thickness of the middle connecting band body (43) gradually increases from the first crease (401) and the second crease (402) on both sides towards a middle portion.

22. The flip-top retention structure for a bottle cap according to claim 19, wherein a junction between the connecting band (4) and the flip-top (3) is located at an upper end, a middle portion, or a lower end of the flip-top (3); and / or, a junction between the connecting band (4) and the cap base (2) is located at an upper end, a middle portion, or a lower end of the cap base (2).

23. The flip-top retention structure for a bottle cap according to claim 19, wherein the cap bands (5) and the connecting band (4) are an integral structure; and / or, the cap bands (5) and the connecting band (4) are separate structures, and a gap slot is disposed between the cap bands (5) and the connecting band (4).

24. The flip-top retention structure for a bottle cap according to claim 19, wherein the connecting band (4) and / or the cap bands (5) are curved structures.

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