A plastic bottle preform having an inwardly tapering cavity

Abstract

The utility model relates to the technical field of plastic bottle embryo, and disclose a kind of plastic bottle embryo with inner collection conical cavity, including bottle body, the top of bottle body is fixedly connected with neck, the top of neck is fixedly connected with bottle mouth, the surface of bottle mouth is fixedly connected with outer thread one, the surface of bottle mouth is fixedly connected with outer thread two, the surface of outer thread two is threadedly connected with cover, the inner wall of cover is equipped with air gap, the surface of bottle body is provided with wear layer.The utility model is provided with segmented outer thread one and outer thread two, and air gap is correspondingly provided in the inner wall of cover, so that the cover is separated from outer thread one during unscrewing, outer thread two is temporarily retained in air gap, a controllable pressure relief channel is formed, so that safe and gradual exhaust of the bottle body under pressure is realized, and the risk of cover flying out due to instantaneous pressure relief of traditional single thread structure is avoided.

Description

Technical Field

[0001] This utility model relates to the field of plastic bottle preform technology, specifically to a plastic bottle preform with an inwardly tapered cavity. Background Technology

[0002] Plastic preforms are the core intermediate product in the production of plastic containers. They are mostly transparent or semi-transparent tubular preforms, primarily made from polyester polymers such as PET through injection molding. The principle is that compressed air is injected into the preform after it has been preheated during the subsequent blow molding process, causing it to expand and conform to the mold to form a complete bottle shape. The preform must possess precise wall thickness uniformity, good thermal stability, and mechanical strength to ensure the quality and sealing of the final container.

[0003] However, when using traditional single-thread preform molding, the cap is prone to detaching instantly when opening a liquid with a large amount of internal gas, causing the internal gas to spray out rapidly. This can easily lead to the cap flying off and causing injury. At the same time, the smooth outer wall of the bottle has poor wear resistance, making it easy to slip and scratch during transportation and handling, which affects the user experience and portability. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a plastic bottle preform with an inwardly tapered cavity, including a bottle body, a bottle neck fixedly connected to the top of the bottle body, a bottle mouth fixedly connected to the top of the bottle neck, an external thread one fixedly connected to the surface of the bottle mouth, an external thread two fixedly connected to the surface of the bottle mouth, a cap threadedly connected to the surface of the external thread two, a hollow knife groove opened on the inner wall of the cap, a wear-resistant layer provided on the surface of the bottle body, and the bottle body having an inwardly tapered cavity.

[0005] Through the above technical solution, the external thread one, external thread two and the empty knife groove make the cap first depressurize through the empty knife groove in the opening path and then engage with the lower thread. This not only eliminates the hidden danger of high pressure spraying, but also forms a scratch-resistant and anti-slip protective interface on the outside of the bottle body through the wear-resistant layer.

[0006] As a further improvement to the above solution, the bottleneck is concentric with the bottle mouth, and the second external thread is located above the first external thread.

[0007] By using the above technical solution, external thread two is arranged above external thread one, so that the cover forms a two-stage thread bearing area in the axial direction, ensuring coaxiality of rotation, reducing the risk of eccentric wear, and extending thread life.

[0008] As a further improvement to the above solution, the empty knife groove is located at the center of the inner wall of the cover.

[0009] With the above technical solution, the hollow groove is centrally located on the inner wall of the cap, so that the second external thread can enter the hollow groove symmetrically at the moment of loosening, and release the internal pressure evenly, avoiding stress concentration on one side that could cause deformation of the bottle mouth.

[0010] As a further improvement to the above solution, the material of the wear-resistant layer is an organosilicon wear-resistant layer.

[0011] Through the above technical solution, the silicone wear-resistant layer forms a flexible-hard composite network on the bottle surface, which has both low surface energy and high pencil hardness, resisting repeated friction while maintaining transparent gloss.

[0012] As a further improvement to the above solution, a fixing ring is fixedly connected to the surface of the bottleneck, and an annular groove is formed on the top of the fixing ring.

[0013] Through the above technical solution, the fixing ring and the annular groove are integrally formed at the bottleneck, providing a glue-free and weld-free mechanical anchoring point for subsequent assembly of handle rings or anti-theft rings.

[0014] As a further improvement to the above scheme, the number of annular grooves is set to several, and the several annular grooves are symmetrically distributed around the center of the top of the fixed ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This invention features segmented external threads one and two, with corresponding empty knife grooves on the inner wall of the cap. This allows the cap to first detach from external thread one during the unscrewing process, while external thread two briefly remains in the empty knife groove, forming a controllable pressure relief channel. This achieves safe and gradual venting of pressurized bottles, avoiding the danger of the cap flying out due to instantaneous pressure relief in traditional single-thread structures.

[0016] This invention significantly increases the coefficient of friction on the bottle surface by setting an organosilicon wear-resistant layer and coordinating it with a fixing ring and a centrally symmetrically distributed annular groove. At the same time, a flexible hanging ring can be quickly attached in the annular groove, thus achieving the purpose of both preventing slippage and being tool-free and portable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall internal structure of the cap of this utility model; Figure 3 This is a schematic diagram of the overall connection structure of the bottle body of this utility model; Figure 4 This is a schematic diagram of the connection structure between the wear-resistant layer and the bottle body of this utility model; Figure 5 This is a schematic cross-sectional view of the bottle body of this utility model.

[0018] In the diagram: 1. Bottle body; 2. Bottle neck; 3. Bottle mouth; 4. External thread one; 5. External thread two; 6. Cap; 7. Hollow groove; 8. Wear-resistant layer; 9. Retaining ring; 10. Annular groove. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Example

[0020] Please combine Figure 1-5 This embodiment of a plastic bottle preform with an inwardly tapered cavity includes a bottle body 1, a bottle neck 2 fixedly connected to the top of the bottle body 1, a bottle mouth 3 fixedly connected to the top of the bottle neck 2, an external thread 4 fixedly connected to the surface of the bottle mouth 3, an external thread 5 fixedly connected to the surface of the bottle mouth 3, a cap 6 threadedly connected to the surface of the external thread 5, a hollow groove 7 opened on the inner wall of the cap 6, and a wear-resistant layer 8 provided on the surface of the bottle body 1. The bottle body 1 is an inwardly tapered cavity.

[0021] In use, the surface of the second external thread 5 is first threadedly connected to the inner wall of the cap 6, and then gradually enters the interior of the empty knife groove 7. At this time, the second external thread 5 separates from the internal thread groove of the cap 6. The cap 6 is fitted onto the surface of the bottle mouth 3 and is limited by the internal thread of the cap 6 and the second external thread 5. Then, the cap 6 is continuously rotated so that the thread near the bottom of the cap 6 is threadedly connected to the first external thread 4. At the same time, the second external thread 5 disengages from the internal thread of the empty knife groove 7 and connects to the thread groove at the top of the empty knife groove 7 inside the cap 6. Through the segmented first external thread 4 and the second external thread 5, when the bottle body 1 needs to be opened, the cap 6 first disengages from the first external thread 4, so that the second external thread 5 is located inside the empty knife groove 7. When venting the gas inside the bottle body 1, the gas will not instantly push the cap out.

[0022] Bottle neck 2 is concentric with bottle mouth 3, and external thread 2 5 is located above external thread 1 4, so that the cap 6 forms a two-stage thread bearing area in the axial direction, ensuring the coaxiality of the rotation and reducing the risk of eccentric wear.

[0023] The hollow groove 7 is located at the center of the inner wall of the cap 6. The hollow groove 7 is centrally located on the inner wall of the cap 6, so that the external thread 2 5 can enter the hollow groove 7 symmetrically when it is loosened, so as to release the internal pressure evenly and avoid stress concentration on one side, which would cause the bottle mouth 3 to deform.

[0024] The wear-resistant layer 8 is made of silicone. The silicone wear-resistant layer 8 forms a flexible-hard composite network on the surface of the bottle body 1, which has both low surface energy and high pencil hardness, resisting repeated friction while maintaining transparent gloss.

[0025] A fixing ring 9 is fixedly connected to the surface of the bottleneck 2. An annular groove 10 is opened on the top of the fixing ring 9. The fixing ring 9 and the annular groove 10 are integrally formed in the bottleneck 2, providing a glue-free and weld-free mechanical anchor point for subsequent assembly of handle rings or anti-theft rings.

[0026] The number of annular grooves 10 is set to several, and the several annular grooves 10 are symmetrically distributed around the top center of the fixed ring 9.

[0027] The implementation principle of a plastic bottle preform with an inwardly tapered cavity in this embodiment is as follows: When connecting the cap 6 and the external thread 5 via the external thread 4, the surface of the external thread 5 first connects with the inner wall of the cap 6, and then gradually enters the interior of the empty slot 7. At this time, the external thread 5 separates from the internal thread groove of the cap 6, and the cap 6 is fitted onto the surface of the bottle mouth 3 and is limited by the internal thread of the cap 6 and the external thread 5. Then, the cap 6 is continuously rotated, so that the thread near the bottom of the cap 6 connects with the external thread 4. At the same time, the external thread 5 disengages from the internal thread of the empty slot 7 and connects to the thread groove at the top of the empty slot 7 inside the cap 6. Through the segmented external thread 4 and external thread 5, when it is necessary to open the bottle body 1, the cap 6 first disengages from the external thread 4, so that the external thread 5 is located inside the empty slot 7. When venting the gas inside the bottle body 1, the gas will not instantly push the cap out.

[0028] The wear-resistant layer 8 increases the wear resistance of the bottle body 1, preventing it from slipping. The fixing ring 9 and the annular groove 10 allow a hanging ring to be attached to the surface of the bottle body 1 for easy carrying.

[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A plastic bottle preform having an inwardly tapered conical cavity, characterized in that: The bottle includes a bottle body (1), a bottle neck (2) is fixedly connected to the top of the bottle body (1), a bottle mouth (3) is fixedly connected to the top of the bottle neck (2), an external thread (4) is fixedly connected to the surface of the bottle mouth (3), an external thread (5) is fixedly connected to the surface of the bottle mouth (3), a cap (6) is threadedly connected to the surface of the external thread (5), a hollow knife groove (7) is opened on the inner wall of the cap (6), a wear-resistant layer (8) is provided on the surface of the bottle body (1), and the bottle body (1) is an inwardly tapered cavity.

2. A plastic bottle preform with an inwardly tapered cavity according to claim 1, characterized in that: The bottleneck (2) is concentric with the bottle mouth (3), and the second external thread (5) is located above the first external thread (4).

3. A plastic bottle preform with an inwardly tapered cavity according to claim 1, characterized in that: The empty knife groove (7) is located at the center of the inner wall of the cover (6).

4. A plastic bottle preform with an inwardly tapered cavity according to claim 1, characterized in that: The wear-resistant layer (8) is made of silicone.

5. A plastic bottle preform with an inwardly tapered cavity according to claim 1, characterized in that: A fixing ring (9) is fixedly connected to the surface of the bottleneck (2), and an annular groove (10) is provided on the top of the fixing ring (9).

6. A plastic bottle preform with an inwardly tapered cavity according to claim 5, characterized in that: The number of the annular grooves (10) is set to several, and the several annular grooves (10) are symmetrically distributed around the top center of the fixed ring (9).

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