PET bottle cap structure

Abstract

The invention discloses a PET bottle cap structure in the technical field of PET bottle caps, the PET bottle cap structure comprises a bottle opening, a cap body and an anti-theft ring, the cap body and the anti-theft ring are connected through a plurality of connecting strips, the outer ring side of the bottle opening is sequentially provided with an external thread, a seaming ring and a supporting ring from top to bottom, and the inner ring side of the cap body is provided with an internal thread matched with the external thread in a spiral mode. The anti-theft ring is used for being arranged between the seaming ring and the supporting ring, mounting grooves are formed in the anti-theft ring at intervals in the circumferential direction of the anti-theft ring, anti-theft elastic pieces are arranged in any mounting groove, and the anti-theft elastic pieces are bent in the direction of the bottle opening and elastically attached to the outer side wall of the bottle opening. The anti-theft elastic pieces are all matched with the lower side face of the seaming ring in an abutting mode, so that the connecting strips are all disconnected. According to the bottle cap structure, the occlusion tightness of the anti-theft ring and the bottle opening is improved through the arrangement of the anti-theft elastic pieces, and then the anti-theft effect of the bottle cap made of the PET material is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PET bottle cap, and particularly relates to a PET bottle cap structure. BACKGROUND

[0002] Traditional HDPE (high-density polyethylene) caps are widely used due to their good physical properties and cost-effectiveness. However, with the increasing environmental awareness and the diversification of consumer demand, new PET (polyethylene terephthalate) caps have emerged, bringing new choices to the market. Traditional bottle caps often use anti-theft buckle positions or folded edges to block the bottle opening, and when opening, the anti-theft effect is achieved by pulling the connection point apart through upward and downward force.

[0003] Chinese patent application CN114735354A, entitled "Twist-off anti-fake bottle cap with flush stubs", discloses a twist-off anti-fake bottle cap with flush stubs, which includes an upper body and a lower ring body. The upper body and the lower ring body are connected by a plurality of anti-fake connection points, and the anti-fake connection points are connected by a plurality of anti-fake connection points. A circumferential notch is formed on the anti-fake connection point, close to the upper body. Further, the anti-fake connection point is narrow at the top and wide at the bottom. It uses an anti-theft buckle position, and when opening, the anti-theft effect is achieved by pulling the connection point apart through upward and downward force. By providing a circumferential notch on the anti-fake connection point, the lower end close to the upper body is broken when twisting, which can easily twist along the circumferential notch, avoiding the lower ring body from being separated from the bottle opening together with the upper body, thus achieving the anti-theft effect. In addition to the easy breakage of the anti-fake connection point, the lower ring body also needs to be tightly engaged with the bottle opening, i.e. the lower ring body can be tightly engaged with the bottle opening. This is relatively easy to achieve for traditional HDPE caps, but it is difficult to achieve the anti-theft effect for PET material end caps. Because the PET material has poor toughness, the anti-theft buckle position of the HDPE product is usually deep, which can easily cause the connection point to break prematurely when the lower cap is placed, and the anti-theft function cannot be achieved. On the contrary, the shallow PET buckle position will not break the connection point when the lower cap is placed, but the lower ring body (also known as anti-theft ring) will be lifted by the connection point when opening, and the anti-theft effect cannot be achieved. SUMMARY

[0004] To overcome the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present application is how to enhance the anti-theft effect of the bottle cap made of PET material.

[0005] The technical solution adopted by the present application to solve the technical problem is: The PET bottle cap structure comprises a bottle mouth, a cap body and an anti-theft ring connected by a plurality of connecting strips, an outer thread, a crimp ring and a support ring are sequentially arranged on the outer ring side of the bottle mouth from top to bottom, the inner ring side of the cap body is provided with an inner thread which is screw-connected with the outer thread, the anti-theft ring is arranged between the crimp ring and the support ring, the anti-theft ring is provided with mounting grooves at intervals along the circumferential direction, and an anti-theft spring piece is arranged in any mounting groove, the anti-theft spring piece is bent towards the bottle mouth and elastically attached to the outer side wall of the bottle mouth, when the cap body is rotated out, the plurality of anti-theft spring pieces are in abutting connection with the lower side of the crimp ring, so that the plurality of connecting strips are disconnected.

[0006] Further, the plurality of mounting grooves are arranged at equal intervals.

[0007] Further, one end of the anti-theft spring piece is fixedly connected to the bottom of the mounting groove, and when the cap body is rotated out, the free end of the anti-theft spring piece is in abutting connection with the lower side of the crimp ring, so that the plurality of connecting strips are disconnected.

[0008] Further, a plurality of anti-rotation teeth corresponding to the plurality of anti-theft spring pieces are arranged between the crimp ring and the support ring, the side face of the anti-rotation teeth away from the bottle mouth is in abutting connection or gap connection with the inner side wall of the anti-theft ring, the anti-theft spring piece is fixedly connected to the side wall of the mounting groove, when the cap body is rotated out, the free end of the anti-theft spring piece is in abutting connection with the corresponding anti-rotation tooth, and the side wall of the anti-theft spring piece is in abutting connection with the lower side of the crimp ring, so that the plurality of connecting strips are disconnected.

[0009] Further, the abutting face of the anti-rotation tooth and the anti-theft spring piece is a plane.

[0010] Further, the plurality of anti-theft spring pieces are integrally formed with the anti-theft ring.

[0011] Further, the outer side face of the anti-theft spring piece is an inclined face which gradually approaches the bottle mouth from one end connected with the anti-theft ring to the other end.

[0012] Further, the edge side of the upper end face of the crimp ring is a rounded corner structure.

[0013] Further, the anti-theft ring is provided with a demolding opening on both sides of any connecting strip, and the inner wall of any demolding opening is inclined downward from top to bottom towards the central axis.

[0014] Further, the outer diameter of the crimp ring is greater than or equal to the inner diameter of the anti-theft ring.

[0015] The beneficial effects of the present application are: This bottle cap structure features an installation groove on the anti-theft ring, with an anti-theft spring piece bent towards the bottle opening inside the groove. This solves the problem that the anti-theft ring cannot maintain a tight fit with the bottle opening due to the material of current PET bottle caps. In other words, by setting multiple anti-theft spring pieces, the tightness of the fit between the anti-theft ring and the bottle opening is improved, thereby enhancing the anti-theft effect of bottle caps made of PET material. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of the PET bottle cap structure of the present invention; Figure 2 This is the second structural schematic diagram of the PET bottle cap structure of the present invention; Figure 3 This is one of the partial cross-sectional views of the PET bottle cap structure of the present invention; Figure 4 This is the third structural schematic diagram of the PET bottle cap structure of the present invention; Figure 5 This is the fourth structural schematic diagram of the PET bottle cap structure of the present invention; Figure 6 This is the fifth structural schematic diagram of the PET bottle cap structure of the present invention; Figure 7 This is a second partial cross-sectional view of the PET bottle cap structure of the present invention; Figure 8 This is the sixth structural schematic diagram of the PET bottle cap structure of the present invention; Figure 9 This is a cross-sectional view of the PET bottle cap structure of the present invention.

[0017] The markings in the diagram are as follows: 1-cap, 2-anti-theft ring, 3-bottle mouth, 4-external thread, 5-sealing ring, 6-support ring, 7-internal thread, 8-mounting groove, 9-anti-theft spring, 10-anti-rotation tooth, 11-demolding port, 12-connecting strip. Detailed Implementation

[0018] The invention will be further described below with reference to the accompanying drawings.

[0019] First, it should be stated that the terms "above" and "below" in this application refer to... Figure 8 The directions shown are for reference; "up" refers to the upper side of bottle mouth 3, and "down" refers to the lower side of bottle mouth 3.

[0020] like Figures 1-9As shown, the PET bottle cap structure includes a bottle mouth 3, a cap body 1 and a theft-proof ring 2 connected by a plurality of connecting strips 12. The outer ring side of the bottle mouth 3 is sequentially provided with an outer thread 4, a crimp ring 5 and a support ring 6 from top to bottom. The inner ring side of the cap body 1 is provided with an inner thread 7 screwing with the outer thread 4. The theft-proof ring 2 is arranged between the crimp ring 5 and the support ring 6. The theft-proof ring 2 is provided with mounting grooves 8 spaced along the circumference. Each mounting groove 8 is provided with a theft-proof spring 9. The theft-proof spring 9 is bent towards the bottle mouth 3 and elastically adheres to the outer side wall of the bottle mouth 3. When the cap body 1 is unscrewed, the plurality of theft-proof springs 9 abut against the lower side of the crimp ring 5, so that the plurality of connecting strips 12 are disconnected.

[0021] During the process of rotating (counterclockwise at present) the cap (this process is referred to as "capping process"), the cap body 1 and the theft-proof ring 2 connected by the plurality of connecting strips 12 are installed on the bottle mouth 3 as a whole from top to bottom. Under the action of the downward rotating force, the theft-proof ring 2 gradually passes through the crimp ring 5 and enters between the crimp ring 5 and the support ring 6. During this process, the theft-proof spring 9 is gradually deformed outward and finally enters the position between the crimp ring 5 and the support ring 6 of the bottle mouth 3. When the theft-proof spring 9 passes the crimp ring 5, it returns to the initial bent state under the elastic force of itself and elastically adheres to the side wall of the bottle mouth 3, and the capping is completed. After the capping is completed, when the product needs to be opened (referred to as "uncapping process"), the cap body 1 is rotated and screwed. Since the theft-proof spring 9 is bent towards the bottle mouth 3 and abuts against the lower side of the crimp ring 5, that is, the plurality of theft-proof springs 9 are clamped at the lower side of the crimp ring 5 of the bottle mouth 3, the theft-proof ring 2 cannot move upward with the cap body 1 in the longitudinal direction of the bottle mouth 3, so the connecting strips 12 are pulled off, and the uncapping is completed. In this design, the mounting grooves 8 are arranged on the theft-proof ring 2, and the theft-proof springs 9 are arranged in the mounting grooves 8. The theft-proof ring 2 is fixed on the lower side of the crimp ring 5 by the theft-proof springs 9, and the elastic force of the theft-proof spring 9 structure compensates for the deficiency that the theft-proof ring 2 made of PET material cannot be tightly engaged with the bottle mouth 3 due to the material characteristics (PET material will be severely damaged when injection molding, and cannot provide a stable inner diameter value). The phenomenon that the theft-proof ring 2 is broken during the capping process (this problem will occur when the inner diameter of the theft-proof ring 2 is too small) or separated during the uncapping process (this problem will occur when the inner diameter of the theft-proof ring 2 is too large) is reduced. In addition, the design of the mounting grooves 8 and the theft-proof springs 9 can also reduce the probability of demolding damage of the internal clamping position and improve the intact rate of the theft-proof ring 2 during demolding, and better achieve the purpose of theft prevention.

[0022] The plurality of mounting grooves 8 are arranged at equal intervals. This design can make the theft-proof springs 9 arranged at equal intervals, so that the force on the theft-proof ring 2 is uniform when the cap body 1 is unscrewed. Preferably, the mounting grooves 8 are arranged between adjacent connecting strips 12. This design is also to make the force on the theft-proof ring 2 more uniform during the uncapping process.

[0023] The anti-theft spring 9 is fixedly connected to the bottom of the mounting groove 8, and when the cover 1 is rotated out, the free end of the anti-theft spring 9 abuts against the lower side of the crimp ring 5, so that the plurality of connecting strips 12 are all disconnected.

[0024] In this design, one end of the anti-theft spring 9 is arranged at the bottom of the mounting groove 8, and the other end abuts against the lower side of the crimp ring 5. In combination with the design that the anti-theft spring 9 is bent towards the bottle mouth 3, the elastic force of the anti-theft spring 9 is ingeniously utilized to assist in fixing the anti-theft ring 2, so that the anti-theft effect is better.

[0025] The bottle mouth 3 is provided with a plurality of rotation stopping teeth 10 corresponding to the plurality of anti-theft springs 9 between the crimp ring 5 and the supporting ring 6, the side of the plurality of rotation stopping teeth 10 away from the bottle mouth 3 abuts against or is in clearance fit with the inner side wall of the anti-theft ring 2, the anti-theft spring 9 is fixedly connected to the side wall of the mounting groove 8, when the cover 1 is rotated out, the free end of the anti-theft spring 9 abuts against the corresponding rotation stopping tooth 10, and the side wall of the anti-theft spring 9 abuts against the lower side of the crimp ring 5, so that the plurality of connecting strips 12 are all disconnected. Figure 8 The red arrow is the opening and rotating direction of the cover 1, and the anti-theft spring 9 is connected to the inner wall of the left side of the mounting groove 8 (the orientation shown in Figure 8 is used as a reference) at this stage. During the capping process, the anti-theft spring 9 is deformed outward, and the horizontally arranged anti-theft spring 9 easily enters the crimp ring 5 of the bottle mouth 3, and the capping is completed. During the uncapping process, as shown in Figure 9 , the red arrow is the rotating direction of the cover 1, and Figure 8 and Figure 9When the cover 1 is rotated out, the anti-theft ring 2 cannot be rotated in the process of the cover 1 rotating upward because the anti-theft spring 9 abuts against the rotation stopping tooth 10. The anti-theft ring 2 cannot go upward in the process of the cover 1 rotating upward because the side surface of the anti-theft spring 9 abuts against the lower side surface of the crimp ring 5. In the case of being limited in two directions, the plurality of connecting strips 12 can be more easily broken. This design method discards the traditional way of limiting the connecting strip 12 in the up-down direction and changes it to be broken, which can more conveniently complete the opening process. At the same time, the anti-theft spring 9 is arranged to be bent upward to the bottle mouth 3, so that the side surface of the anti-theft spring 9 is clamped in the crimp ring 5 of the bottle mouth 3, which can prevent the anti-theft ring 2 from falling off from above the bottle mouth 3 after the bottle cap is opened, and is convenient for subsequent recycling of the bottle cap as a whole, energy saving and environmental protection. Preferably, the lower side surface of the anti-theft spring 9 leaves a gap from the bottom surface of the mounting groove 8, and the upper side surface of the anti-theft spring 9 also leaves a gap from the opening end surface of the mounting groove 8. This design can enhance the elastic effect of the anti-theft spring 9, and facilitate the anti-theft ring 2 to smoothly pass through the crimp ring 5 to reach the specified position (the specified position is the position between the crimp ring 5 and the support ring 6 on the side of the bottle mouth 3) in the process of sealing.

[0026] The abutting surface of the rotation stopping tooth 10 and the anti-theft spring 9 is a plane. This design can better abut against the anti-theft spring 9, and facilitate the completion of the opening process.

[0027] The plurality of anti-theft springs 9 are integrally formed with the anti-theft ring 2. PET material is a kind of recyclable and easy-to-process thermoplastic plastic. Preferably, the cover 1, the connecting strip 12, the anti-theft ring 2 and the plurality of anti-theft springs 9 are integrally formed, which makes the processing more convenient.

[0028] The outer side surface of the anti-theft spring 9 is an inclined surface gradually approaching the bottle mouth 3 from one end connected with the anti-theft ring 2 to the other end. From the design, the elasticity of the anti-theft spring 9 can be increased to a certain extent, and the probability of damage of the anti-theft spring 9 in the sealing process can be reduced.

[0029] The edge side of the upper end surface of the crimp ring 5 is a rounded corner structure. This design can facilitate the downward movement of the anti-theft ring 2 and the plurality of anti-theft springs 9 in the sealing process, more smoothly pass through the crimp ring 5, and can reduce the phenomenon of breakage of the anti-theft ring 2 and damage of the anti-theft spring 9 in the sealing process.

[0030] The anti-theft ring 2 is provided with a demolding opening 11 on both sides of any connecting strip 12, and the inner wall of any demolding opening 11 is inclined from top to bottom to the central axis direction. The inclined arrangement of the inner wall of any demolding opening 11 facilitates demolding and reduces the probability of damage and deformation of the connecting strip 12 on the anti-theft ring 2 in the demolding process.

[0031] The outer diameter of the above-mentioned crimp ring 5 is greater than or equal to the inner diameter of the anti-theft ring 2. The outer diameter of the conventional crimp ring 5 is greater than the inner diameter of the anti-theft ring 2. In this embodiment, the material of the bottle cap structure is PET (polyethylene terephthalate), and the PET molecular chain mainly has a rigid benzene ring, so the natural elasticity is poor. In this embodiment, because the anti-theft spring 9 is arranged in the installation groove 8 of the anti-theft ring 2, even if the outer diameter of the above-mentioned crimp ring 5 is equal to the inner diameter of the anti-theft ring 2, it will not affect the anti-theft effect in the later cap opening process. Preferably, the outer diameter of the above-mentioned crimp ring 5 is equal to the inner diameter of the anti-theft ring 2, and the decrease of the requirement for the inner diameter of the anti-theft ring 2 makes the anti-theft ring 2 receive smaller expansion force when passing through the crimp ring 5, so that it can pass through the crimp ring 5 more smoothly, and to a certain extent, reduce the problem of the anti-theft ring 2 breaking during the sealing process.

[0032] In summary, the embodiment of the application provides a PET bottle cap structure. The installation groove 8 is arranged on the anti-theft ring 2, and the anti-theft spring 9 bent towards the bottle mouth 3 is arranged in the installation groove 8. The problem that the anti-theft ring 2 cannot be tightly engaged with the bottle mouth 3 due to the material problem of the PET bottle cap at the present stage is solved. Because the design method does not require the inner diameter of the anti-theft ring 2 to be as strict as the conventional bottle cap, even if the inner diameter of the anti-theft ring 2 is equal to the outer diameter of the crimp ring 5, or the inner diameter of the anti-theft ring 2 is slightly greater than the outer diameter of the crimp ring 5, as long as the plurality of anti-theft springs 9 abut against the crimp ring 5 when the cap body 1 is screwed, the anti-theft effect can be achieved. The design method improves the tightness of the engagement between the anti-theft ring 2 and the bottle mouth 3 by arranging the plurality of anti-theft springs 9, thereby improving the anti-theft effect of the bottle cap made of PET material. In addition, the design of the installation groove 8 can also reduce the probability of demolding and scratching of the internal buckle, and the decrease of the requirement for the inner diameter of the anti-theft ring 2 can also reduce the problem of the anti-theft ring 2 breaking during the sealing process to a certain extent.

Claims

1. A PET bottle cap structure, comprising a bottle mouth (3) and a cap body (1) and an anti-theft ring (2) connected by multiple connecting strips (12), wherein the outer ring side of the bottle mouth (3) is provided with an external thread (4), a sealing ring (5) and a support ring (6) in sequence from top to bottom, and the inner ring side of the cap body (1) is provided with an internal thread (7) that is helically engaged with the external thread (4), wherein the anti-theft ring (2) is used to be disposed between the sealing ring (5) and the support ring (6), characterized in that: The anti-theft ring (2) has mounting grooves (8) spaced apart along its circumference. Each mounting groove (8) is provided with an anti-theft spring (9). The anti-theft spring (9) bends toward the bottle mouth (3) and elastically fits against the outer wall of the bottle mouth (3). When the cap (1) is unscrewed, multiple anti-theft springs (9) abut against the lower side of the sealing ring (5), causing multiple connecting strips (12) to break.

2. The PET bottle cap structure as described in claim 1, characterized in that: Multiple mounting slots (8) are arranged at equal intervals.

3. The PET bottle cap structure as described in claim 1, characterized in that: One end of the anti-theft spring clip (9) is fixedly connected to the bottom of the mounting groove (8). When the cover (1) is unscrewed, the free end of the anti-theft spring clip (9) abuts against the lower side of the sealing ring (5), causing multiple connecting strips (12) to break.

4. The PET bottle cap structure as described in claim 1, characterized in that: The bottle opening (3) is located between the sealing ring (5) and the support ring (6) and is provided with multiple anti-rotation teeth (10) corresponding to multiple anti-theft springs (9). The side of the multiple anti-rotation teeth (10) away from the bottle opening (3) is in contact with or gapped with the inner wall of the anti-theft ring (2). The anti-theft spring (9) is fixedly connected to the side wall of the mounting groove (8). When the cover (1) is screwed out, the free end of the anti-theft spring (9) abuts against its corresponding anti-rotation tooth (10), and the side wall of the anti-theft spring (9) abuts against the lower side of the sealing ring (5), so that multiple connecting strips (12) are disconnected.

5. The PET bottle cap structure as described in claim 4, characterized in that: The surface where the anti-rotation tooth (10) abuts against the anti-theft spring (9) is a plane.

6. The PET bottle cap structure as described in any one of claims 1-5, characterized in that: Multiple anti-theft clips (9) are integrally formed with the anti-theft ring (2).

7. The PET bottle cap structure as described in claim 6, characterized in that: The outer surface of the anti-theft clip (9) is an inclined surface that gradually approaches the bottle mouth (3) from one end connected to the anti-theft ring (2) to the other end.

8. The PET bottle cap structure as described in claim 1, characterized in that: The upper end face of the sealing ring (5) has a rounded corner structure.

9. The PET bottle cap structure as described in claim 1, characterized in that: The anti-theft ring (2) is provided with demolding openings (11) on both sides of any connecting strip (12), and the inner wall of any demolding opening (11) is inclined from top to bottom towards its central axis.

10. The PET bottle cap structure as described in claim 1, characterized in that: The outer diameter of the sealing ring (5) is greater than or equal to the inner diameter of the anti-theft ring (2).

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