A bottle cap and a packaging bottle having the same

Abstract

The application discloses a bottle cap and a packaging bottle with the bottle cap. The bottle cap comprises a top part and a skirt part, the top part and the skirt part are integrated, an inner sealing ring is arranged on the top part, the inner sealing ring is located inside the skirt part, the inner sealing ring is separated from the skirt part, a sealing ring I corresponding to a bottle mouth end plane and a sealing ring II corresponding to a bottle mouth end outer edge corner are further arranged on the top part. The bottle cap is provided with multiple sealing structures, so that the sealing defects caused by low rigidity of the lightweight design are compensated, the qualified rate and the use stability of the packaging product are improved, and the bottle cap can meet the demand of packaging the gas-containing beverage.

Description

Technical Field

[0001] This invention relates to bottle caps for sealing bottle openings. Background Technology

[0002] Lightweight packaging is an inevitable trend in the beverage, dairy, and drinking water bottling industries. Lightweight packaging bottles mainly refer to the plastic bottle body and matching plastic cap. Reduced weight can lead to cost reductions for companies, and reduced plastic usage lowers the demand for petrochemical resources, thus meaning reduced carbon emissions. Therefore, there are objective conditions that promote lightweight packaging bottle design.

[0003] Plastic caps, also known as bottle caps, are designed for lightweight plastic bottles. Their rigidity is reduced, making them relatively flexible. When carbonated beverages are filled, the internal pressure of the bottle is greater than the external atmospheric pressure, often causing a bulge to form in the middle of the lightweight bottle cap.

[0004] In existing technologies, the sealing structure inside lightweight bottle caps follows the design standards of high-rigidity bottle caps. High-rigidity bottle caps do not deform or deform only slightly during use, and the contact state between their internal sealing structure and the bottle opening is predictable; therefore, the sealing effect is predictable. However, lightweight bottle caps deform during use, and the contact state between the sealing structure and the bottle opening becomes unstable, leading to inconsistent sealing effects and leakage problems.

[0005] In existing technologies, lightweight bottle caps have an inner sealing ring, and the inner side of the cap's skirt has threads corresponding to the outer wall of the bottle opening. When the cap is attached to the bottle opening, the inner sealing ring should have an interference fit with the inner wall of the bottle opening to achieve an ideal sealing effect, forming a sealed structure. However, during operation, the bottle body is subjected to compression, heating, or fermentation of the beverage or liquid food inside, producing gas or degassing of dissolved gases. This causes the internal pressure of the bottle to increase and exceed the external atmospheric pressure. The pressure difference causes the middle part of the cap to bulge and deform. This deformation process disrupts the original sealing structure, reducing or eliminating the aforementioned interference fit, thus losing the ideal sealing effect. Therefore, the applicability of this type of lightweight bottle cap in existing technologies is extremely limited; it is only suitable for packaging non-carbonated beverages. Summary of the Invention

[0006] The technical problem to be solved by this invention is how to construct a sealing structure suitable for lightweight designs so that the lightweight bottle cap can still maintain a sufficient sealing connection with the bottle opening after deformation.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: The bottle cap includes a top part and a skirt part, which are integrated. The top part is provided with an inner sealing ring, which is located inside the skirt part and separated from the skirt part. The top part is also provided with a sealing ring I corresponding to the end plane of the bottle mouth and a sealing ring II corresponding to the outer corner of the end of the bottle mouth. Both sealing ring I and sealing ring II are located between the inner sealing ring and the skirt. The distance from sealing ring I to the inner sealing ring is less than the distance from sealing ring II to the inner sealing ring. The center of sealing ring I and the center of sealing ring II coincide with the center line of the bottle cap. The cross-section of sealing ring I and the cross-section of sealing ring II are both V-shaped. The opening direction of sealing ring I intersects with the opening direction of sealing ring II. The opening angle of sealing ring I is greater than the opening angle of sealing ring II. The height of the outer side of sealing ring II, the height of the inner side of sealing ring I, the height of the outer side of sealing ring I, and the height of the inner side of sealing ring II increase sequentially.

[0008] In the above technical solution, sealing ring I and sealing ring II can form two sealing structures in use. Combined with the sealing structure formed by the original inner sealing ring of the bottle cap, the bottle cap has three sealing structures, forming a multi-seal design concept.

[0009] The inner sealing ring corresponds to the inner wall of the bottle mouth, while sealing ring I and sealing ring II correspond to the end plane of the bottle mouth and the outer corner of the bottle mouth end, respectively.

[0010] The inner sealing ring relies on the deformation obtained by the compression extending into the bottle mouth to convert into an interference fit with the inner wall of the bottle mouth. Sealing ring I obtains a connection relationship by positively compressing the end plane of the bottle mouth through the change in the position of the bottle cap relative to the bottle mouth. The greater the locking torque between the bottle cap and the bottle mouth, the tighter the connection relationship. Moreover, the locking torque is controllable, so this connection relationship is controllable.

[0011] The inner and outer edges of sealing ring I have different heights. When the bottle cap is attached to the bottle neck, the inner edge of sealing ring I contacts the end plane of the bottle neck before the outer edge. The inner and outer edges of sealing ring I contact the end plane of the bottle neck sequentially. During this process, the air in the opening between the inner and outer edges is squeezed out, preventing a large amount of air in the opening of sealing ring I from being compressed. This reduces the deformation range of the inner and outer edges of sealing ring I, which in turn facilitates greater deformation, making the inner and outer edges of sealing ring I more flexible and easier to deform.

[0012] The surface of the outer corner of the bottle mouth is a structure that combines two planes or an arc surface located between two planes. Therefore, the surface of the outer corner of the bottle mouth is not a single planar structure.

[0013] After sealing ring II contacts the outer corner of the bottle mouth, due to the non-uniform planar structure of the outer corner, sealing ring II will not directly press against the outer corner of the bottle mouth in the direction parallel to the pressing plane of sealing ring I. Instead, after the outer edge of sealing ring II contacts the outer corner, the outer edge of sealing ring II deforms along the surface of the outer corner. This deformation of the outer edge of sealing ring II causes the inner edge of sealing ring II to press against the outer corner of the bottle mouth. Simultaneously, as the bottle cap and bottle mouth become more tightly connected, the inner edge of sealing ring II gets closer and closer to the outer corner of the bottle mouth, eventually resulting in the inner edge of sealing ring II pressing against the outer corner of the bottle mouth. The connection between sealing ring II and the outer corner of the bottle mouth is also affected by the locking torque of the bottle cap and bottle mouth; therefore, this connection is controllable.

[0014] As mentioned above, the inner and outer edges of sealing ring I should be more flexible and deformable, and the deformation of the outer edge of sealing ring II drives the movement of its inner edge. This technical solution encourages that the inner and outer edges of sealing ring I be thin, while the inner and outer edges of sealing ring II be thick. Specifically, the thickness of both the inner and outer edges of sealing ring I is less than the thickness of the inner edge of sealing ring II. The thinner inner and outer edges of sealing ring I facilitate its flexibility and deformation; the thicker inner and outer edges of sealing ring II facilitate its elasticity, resulting in a closer relationship between the two.

[0015] The inner and outer sides of sealing ring I correspond to the end plane of the bottle mouth. Their deformation directions must be opposite to facilitate the change in the opening shape of sealing ring I during deformation, thus enabling air expulsion. Therefore, the opening angle of sealing ring I is set to an obtuse angle. The inner and outer sides of sealing ring II correspond to the outer corner of the bottle mouth. Their deformation process must correspond to the size of the outer corner of the bottle mouth, which is a 90-degree rounded corner. Therefore, the opening angle of sealing ring II is set to be less than or equal to 90 degrees.

[0016] The bottle cap and bottle body combined form a packaging bottle, which includes a bottle body and a bottle cap. The bottle cap is installed on the bottle opening of the bottle body. The bottle cap includes a top portion and a skirt portion, which are integrated. The top portion has an inner sealing ring that seals against the inner wall of the bottle opening. The skirt portion is threaded to the outer wall of the bottle opening. The top portion also has sealing ring I and sealing ring II, which are located between the inner sealing ring and the skirt. The distance from sealing ring I to the inner sealing ring is... The distance from sealing ring I to the inner sealing ring is less than that of sealing ring II. The center of sealing ring I and the center of sealing ring II coincide with the center line of the bottle body. The cross-section of sealing ring I and sealing ring II are both V-shaped. The opening direction of sealing ring I intersects with the opening direction of sealing ring II. The opening angle of sealing ring I is greater than the opening angle of sealing ring II. The inner side and outer side of sealing ring I are sealed to the end plane of the bottle mouth. The inner side and outer side of sealing ring II are sealed to the outer corner of the end of the bottle mouth.

[0017] Compared to the static situation where the highly plastic bottle cap does not deform on the bottle body in the existing technology, the lightweight design changes the connection state when a bulge occurs after the bottle cap is combined with the bottle body, thus forming a dynamic connection process.

[0018] When the bottle cap bulges due to pressure difference, the bulging portion pulls on sealing ring I, slightly reducing the contact area between the inner edge of sealing ring I and the bottle mouth end plane. However, due to the pressure difference, the connection between the inner edge of sealing ring I and the bottle mouth end plane is maintained. The outer edge of sealing ring I maintains the connection obtained by the change in position of the bottle cap relative to the bottle mouth when tightened, thus maintaining the connection between the inner edge of sealing ring I and the outer corner of the bottle mouth end. Since sealing ring II is located away from the bulging part of the bottle cap, the connection between sealing ring II and the outer corner of the bottle mouth end is unaffected. Therefore, even if the bulging reduces the sealing effect between the inner sealing ring and the inner wall of the bottle mouth, sufficient sealing effect can still be achieved through sealing rings I and II.

[0019] This invention employs the above-mentioned technical solution: the bottle cap, by incorporating a multi-layered sealing structure, compensates for the sealing defects caused by low rigidity resulting from the lightweight design, thereby improving the pass rate and stability of the packaged product. This enables the bottle cap to meet the requirements for packaging carbonated beverages. Attached Figure Description

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the bottle cap according to the first embodiment of the present invention;

[0022] Figure 2This is a schematic diagram of the connection between the bottle cap and the bottle mouth in the initial stage of assembly according to the first embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection between the bottle cap and the bottle mouth in the middle of the assembly according to the first embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection between the bottle cap and the bottle mouth after assembly, according to the first embodiment of the present invention. Detailed Implementation

[0025] In a first embodiment of the present invention, the packaging bottle consists of a bottle body and a bottle cap. The bottle body has a bottle opening, the outer wall of which has external threads, and the inner wall of which is smooth. Figure 1 As shown, the bottle cap includes a top portion 1 and a skirt portion 2, which are integrated. The skirt portion 2 has an internal thread on its inner side. An inner sealing ring 3 is provided on the top portion 1, located inside the skirt portion 2. The centers of both rings coincide with the center line of the bottle cap. The inner sealing ring 3 is separated from the skirt portion 2, and the area between them is used to accommodate the bottle opening. Figure 2 , 3 As shown in Figure 4.

[0026] like Figure 2 As shown, the top portion 1 is also provided with a sealing ring I4 corresponding to the end plane 5 of the bottle mouth and a sealing ring II6 corresponding to the outer corner 7 of the bottle mouth. Both sealing rings I4 and II6 are located between the inner sealing ring 3 and the skirt. The centers of sealing ring I4 and II6 coincide with the centerline of the bottle cap. The centers of the inner sealing ring 3, sealing ring I4, sealing ring II6, and skirt portion 2 are in a positional relationship with the same center. Sealing ring I4 is located inside sealing ring II6, therefore, the distance from sealing ring I4 to the inner sealing ring 3 is less than the distance from sealing ring II6 to the inner sealing ring 3. The cross-sections of sealing ring I4 and sealing ring II6 are both V-shaped, but their opening angles are different. The opening angle of sealing ring I4 is an obtuse angle, while the opening angle of sealing ring II6 is an acute angle, making the opening angle of sealing ring I4 greater than that of sealing ring II6. The opening orientation of sealing ring I4 intersects with the opening orientation of sealing ring II6.

[0027] The height of the outer edge 11 of sealing ring II 6, the height of the inner edge 8 of sealing ring I 4, the height of the outer edge 9 of sealing ring I 4, and the height of the inner edge 10 of sealing ring II 6 increase sequentially, meaning that the four are not on the same horizontal plane. Not only are the thicknesses of the inner edge 8 and the outer edge 9 of sealing ring I 4 less than the thickness of the inner edge 10 of sealing ring II 6, but the thicknesses of the inner edge 8 and the outer edge 9 of sealing ring I 4 are also less than the thickness of the outer edge 11 of sealing ring II 6.

[0028] In use, pour the liquid material into the bottle, then screw the cap onto the bottle neck. The cap and bottle neck are connected by threads. As the cap is tightened onto the bottle neck, the distance between the cap and the bottle neck gradually decreases, and they move towards each other. When the cap is engaged with the bottle body, the bottle neck extends into the area between the inner sealing ring 3 and the skirt portion 2, such as... Figure 2 As shown. The inner sealing ring 3 is press-fitted to the inner wall of the bottle mouth to form a sealed connection. The sealing ring I4 is pressed against the end plane 5 of the bottle mouth, as shown. Figure 2 As described above, the inner side 8 of the sealing ring I4 first contacts the end plane 5 of the bottle mouth, and the inner side 8 of the sealing ring I4 deforms accordingly, such as... Figure 3 , Figure 4 As described above, the opening width of the sealing ring I4 increases, and then the outer edge 9 of the sealing ring I4 contacts the end plane 5 of the bottle mouth, ultimately sealing the sealing ring I4 to the end plane 5 of the bottle mouth. Figure 3 , 4 Sealing ring II6 is pressed against the outer corner 7 of the bottle mouth. The outer edge 11 of sealing ring II6 first contacts the outer corner 7 of the bottle mouth, and then sealing ring II6 as a whole deforms accordingly, causing the inner edge 10 of sealing ring II6 to be driven and pressed against the outer corner 7 of the bottle mouth. Finally, sealing ring II6 and the outer corner 7 of the bottle mouth are sealed together. After the connection, the center line of the bottle cap coincides with the center line of the bottle body, so that the center of sealing ring I4, the center of sealing ring II6 and the center line of the bottle body coincide.

[0029] The second embodiment of the present invention differs from the first embodiment in that the opening angle of the sealing ring II is a right angle.

Claims

1. A bottle cap, the bottle cap comprising a top portion (1) and a skirt portion (2), the top portion (1) and the skirt portion (2) being integrally connected, the top portion (1) being provided with an inner sealing ring (3), the inner sealing ring (3) being located inside the skirt portion (2), the inner sealing ring (3) being spaced apart from the skirt portion (2), characterized in that: The top part (1) is also provided with a sealing ring I (4) corresponding to the end plane (5) of the bottle mouth and a sealing ring II (6) corresponding to the outer corner (7) of the end of the bottle mouth. The sealing ring I (4) and the sealing ring II (6) are both located between the inner sealing ring (3) and the skirt. The distance from the sealing ring I (4) to the inner sealing ring (3) is less than the distance from the sealing ring II (6) to the inner sealing ring (3). The center of the sealing ring I (4) and the center of the sealing ring II (6) coincide with the center line of the bottle cap. The cross-sections of sealing ring I (4) and sealing ring II (6) are both V-shaped. The opening orientation of sealing ring I (4) intersects with the opening orientation of sealing ring II (6). The opening angle of sealing ring I (4) is greater than the opening angle of sealing ring II (6). The height of the outer side (11) of sealing ring II (6), the height of the inner side (8) of sealing ring I (4), the height of the outer side (9) of sealing ring I (4), and the height of the inner side (10) of sealing ring II (6) increase sequentially.

2. The bottle cap according to claim 1, characterized in that: The thickness of the inner side (8) and the outer side (9) of the sealing ring I (4) are both less than the thickness of the inner side (10) of the sealing ring II (6), and the thickness of the inner side (8) and the outer side (9) of the sealing ring I (4) are both less than the thickness of the outer side (11) of the sealing ring II (6).

3. The bottle cap according to claim 1, characterized in that: The opening angle of the sealing ring I (4) is an obtuse angle, and the opening angle of the sealing ring II (6) is less than or equal to ninety degrees.

4. A packaging bottle, the packaging bottle comprising a bottle body and a bottle cap, the bottle cap being installed on the bottle mouth of the bottle body, the bottle cap comprising a top portion (1) and a skirt portion (2), the top portion (1) and the skirt portion (2) being integrally connected, the top portion (1) being provided with an inner sealing ring (3) for sealing connection with the inner wall of the bottle mouth, and the skirt portion (2) being threadedly connected to the outer wall of the bottle mouth, characterized in that: The top part (1) is also provided with sealing ring I (4) and sealing ring II (6). Both sealing ring I (4) and sealing ring II (6) are located between the inner sealing ring (3) and the skirt. The distance from sealing ring I (4) to the inner sealing ring (3) is less than the distance from sealing ring II (6) to the inner sealing ring (3). The center of sealing ring I (4) and the center of sealing ring II (6) coincide with the center line of the bottle body. The cross-section of sealing ring I (4) and the cross-section of sealing ring II (6) are... The cross-sections are all V-shaped. The opening direction of the sealing ring I (4) intersects with the opening direction of the sealing ring II (6). The opening angle of the sealing ring I (4) is greater than the opening angle of the sealing ring II (6). The inner side (8) and the outer side (9) of the sealing ring I (4) are sealed to the end plane (5) of the bottle mouth. The inner side (10) and the outer side (11) of the sealing ring II (6) are sealed to the outer corner (7) of the end of the bottle mouth.

5. The packaging bottle according to claim 4, characterized in that: The thickness of the inner side (8) and the outer side (9) of the sealing ring I (4) are both less than the thickness of the inner side (10) of the sealing ring II (6), and the thickness of the inner side (8) and the outer side (9) of the sealing ring I (4) are both less than the thickness of the outer side (11) of the sealing ring II (6).

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