Sealing type plastic bottle cap and plastic bottle
By designing annular pressing strips and annular inner caps on the sealed plastic bottle cap, and setting sealing convex strips and inclines on them, the problem of poor sealing effect of the sealed plastic bottle cap is solved, and the effect of maintaining good sealing performance after long-term use is achieved and reducing bottle deformation is reduced.
Patent Information
- Application Number
- CN202421132923.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-05-22
AI Technical Summary
After long-term use, the sealing effect of existing sealed plastic bottle caps will become worse and cannot effectively resist the deformation of the inner and outer walls of the bottle mouth.
A sealed plastic bottle cap is designed. An annular pressing strip is provided on the inner side of the top wall of the bottle cap body, and an annular inner cover is arranged between the annular pressing strip and the inner wall of the bottle cap body. An inclined downward sealing convex strip is provided on the annular inner cover, and a slope is provided on the lower part of the annular pressing strip for interference with the sealing convex strip.
Through the cooperation of the annular inner cap and the sealing convex strip, the sealing performance of the bottle mouth can be maintained after multiple screwing operations, reducing deformation of the bottle body and bottle mouth, and extending the sealing effect.
Smart Images
Figure CN222820517U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of plastic bottle caps, in particular to a sealed plastic bottle cap and a plastic bottle. Background Art
[0002] Hot filling means that the liquid material is filled into the bottle at high temperature and then immediately capped, and then cooled to room temperature in a sealed state. The density of the liquid material during hot filling is less than the density at room temperature. When the filling volume is constant, as the temperature of the liquid material decreases, the density of the liquid material will increase, which will cause the volume of the liquid material in the plastic bottle to decrease. Therefore, a certain degree of vacuum will appear in the plastic bottle, causing the body and mouth of the plastic bottle to deform.
[0003] In order to ensure that the sealing performance of the hot-fill bottle will not decrease when the bottle mouth is deformed. Existing sealed plastic bottle caps, such as the side-pressure sealed plastic bottle cap disclosed in the Chinese patent application number CN202223238803X, will be provided with a downwardly inclined sealing bead at the intersection of the top surface and the side wall of the bottle cap, and a continuously distributed sealing convex strip will be provided at the bottom of the top surface of the bottle cap. The end of the sealing bead is used for interference fit with the outer wall of the bottle mouth of the bottle body, and the sealing convex strip is used to press against the inner wall of the bottle mouth of the bottle body, thereby improving the sealing performance between the bottle cap and the bottle mouth. However, when the sealing convex strip squeezes the inner wall of the bottle mouth, the bottle mouth will also generate a force on the sealing convex strip in the opposite direction of the squeezing force. After the bottle cap has been screwed for many times, the sealing boss will be deformed, which will not achieve a good sealing effect.
[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content
[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a sealed plastic bottle cap, aiming to solve the problem that the sealing effect of the existing sealed plastic bottle cap deteriorates after long-term use.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A sealed plastic bottle cap comprises a bottle cap body; an annular bead is provided on the inner side surface of the top wall of the bottle cap body; the annular bead is perpendicular to the top wall of the bottle cap body, and an annular inner cover is provided between the annular bead and the inner side wall of the bottle cap body; the annular inner cover can be covered on the upper end of the bottle mouth, and a sealing convex strip inclined downward is provided on the side of the annular inner cover facing the annular bead; an inclined surface for interference fit with the sealing convex strip is provided at the lower part of the annular bead; a convex block for interference fit with the inner wall of the bottle mouth is provided on the side of the sealing convex strip facing the inner wall of the bottle mouth; and a sealing bead for interference fit with the outer wall of the bottle mouth is provided at the bottom of the annular inner cover.
[0008] Furthermore, a circular concave portion is formed downwardly on the top wall of the bottle cap body; and a circular convex portion is formed upwardly at the center of the circular concave portion.
[0009] Furthermore, the thickness of the bottle cap body is 0.5mm-0.7mm.
[0010] Furthermore, a distance H between the upper end of the circular protrusion and the lower concave surface of the circular concave portion is 1.0 mm-1.5 mm.
[0011] Furthermore, the sealed plastic bottle cap also includes an anti-theft ring; the anti-theft ring is detachably connected to the side wall of the bottle cap body.
[0012] Furthermore, a plurality of reinforcing ribs are distributed on the inner side wall of the anti-theft ring along the circumference of the anti-theft ring.
[0013] The utility model provides a plastic bottle, comprising the aforementioned sealed plastic bottle cap.
[0014] Beneficial effects:
[0015] The utility model provides a sealed plastic cap, which is provided with an annular pressure strip on the inner side surface of the top wall of the bottle cap body, and an annular inner cover is provided between the annular pressure strip and the inner side wall of the bottle cap body, so that the bottle mouth can be sealed by means of the annular inner cover; and an inclined surface for interference fit with a sealing convex strip on the annular inner cover is provided at the lower part of the annular pressure strip, so that the sealing convex strip is pushed toward the inner wall of the bottle mouth, and the sealing convex strip and the inner wall of the bottle mouth are kept in an interference fit state. Therefore, after the plastic bottle cap is screwed for many times, the plastic bottle cap can still maintain good sealing performance to the bottle mouth through the interference fit between the sealing convex strip and the sealing pressure strip and the inner and outer walls of the bottle mouth, and the sealing effect of the plastic bottle cap to the bottle mouth will not be deteriorated.
[0016] The utility model also provides a plastic bottle, including the aforementioned sealed plastic bottle cap. Since the sealed plastic bottle cap provided by the utility model can not only seal the bottle mouth, but also reduce the deformation degree of the bottle body and the bottle mouth of the plastic bottle, the plastic bottle provided by the utility model can be widely used in hot filling production lines. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The structure of the sealed plastic bottle cap provided by the utility model is schematically shown Figure 1 .
[0018] Figure 2 for Figure 1 Sectional view along AA direction.
[0019] Figure 3 for Figure 2 Enlarged view of part B.
[0020] Figure 4 The structure of the sealed plastic bottle cap provided by the utility model is schematically shown Figure 2 .
[0021] Figure 5 for Figure 4 Sectional view along CC direction.
[0022] Reference numerals:
[0023] 1-bottle cap body; 101-circular concave portion; 102-circular convex portion;
[0024] 2- annular layer; 3- annular inner cover; 4- bottle mouth;
[0025] 5-Sealing convex strip; 51-Bevel; 52-Bump;
[0026] 6-Sealing strip; 8-Anti-theft ring; 9-Reinforcement rib. DETAILED DESCRIPTION
[0027] The utility model provides a sealed plastic bottle cap. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0028] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means more than two.
[0029] See also Figures 1 to 3The utility model provides a sealed plastic bottle cap, comprising a bottle cap body 1. Further, an annular strip 2 is provided on the inner side surface of the top wall of the bottle cap body 1; the annular strip 2 is perpendicular to the top wall of the bottle cap body 1, and an annular inner cover 3 is provided between the annular strip 2 and the inner side wall of the bottle cap body 1. The annular inner cover 3 can be covered on the upper end of the bottle mouth 4, and a sealing convex strip 5 inclined downward is provided on the side of the annular inner cover 3 facing the annular strip 2; an inclined surface 51 for interference fit with the sealing convex strip 5 is provided at the lower part of the annular strip 2; a convex block 52 for interference fit with the inner wall of the bottle mouth 4 is provided on the side of the sealing convex strip 5 facing the inner wall of the bottle mouth 4; a sealing strip 6 for interference fit with the outer wall of the bottle mouth 4 is provided at the bottom of the annular inner cover 3, and the sealing strip 6 is an annular sealing strip 6.
[0030] When the sealed plastic bottle cap provided by the utility model is tightened, the sealing bead 6 has an interference fit with the outer wall of the bottle mouth 4; and the inclined surface 51 has an interference fit with the sealing convex strip 5, so that the sealing convex strip 5 is pushed toward the inner wall of the bottle mouth 4, and when the sealing convex strip 5 is pushed toward the inner wall of the bottle mouth 4, the convex block 52 arranged on the side of the sealing convex strip 5 facing the inner wall of the bottle mouth 4 can have an interference fit with the inner wall of the bottle mouth 4, so that the plastic bottle cap can achieve sealing of the bottle mouth 4.
[0031] Since the inclined surface 51 at the lower part of the annular bead 2 can push the sealing ridge 5 toward the inner wall of the bottle mouth 4 and keep the sealing ridge 5 and the inner wall of the bottle mouth 4 in an interference fit state, the plastic bottle cap can still maintain a good sealing performance against the bottle mouth 4 through the interference fit between the sealing ridge 5 and the sealing bead 6 and the inner and outer walls of the bottle mouth 4 after multiple screwing operations.
[0032] like Figure 2 As shown, further, the bottle cap body 1 is a polypropylene bottle cap body, and the top wall of the bottle cap body 1 is formed with a circular concave portion 101 downwardly; the center of the circular concave portion 101 is formed with a circular convex portion 102 upwardly. When the plastic bottle cap provided by the utility model is used to seal a hot-filled plastic bottle with liquid material, after the liquid material cools down, the circular convex portion 102 can be depressed downwardly under the action of external air pressure, so that the vacuum degree inside the plastic bottle can be reduced, thereby reducing the deformation degree of the bottle body and the bottle mouth 4. Therefore, the plastic bottle cap provided by the utility model can not only seal the bottle mouth 4, but also reduce the deformation degree of the plastic bottle body and the bottle mouth 4.
[0033] In the present invention, the circular convex portion 102 is formed in the circular concave portion 101, so that the circular convex portion 102 can be more easily sunken downward under the action of external air pressure, thereby being able to effectively reduce the vacuum degree inside the plastic bottle.
[0034] When the thickness of the bottle cap body 1 is thicker, the bottle cap body 1 is difficult to sink downward under the action of external air pressure, and when the thickness of the bottle cap body 1 is thinner, the circular recess 101 is also easy to deform after the liquid material in the plastic bottle is cooled, which will affect the appearance of the plastic bottle cap. Therefore, in the utility model, the thickness of the bottle cap body 1 is preferably 0.5mm-0.7mm.
[0035] Furthermore, the distance H between the upper end of the circular protrusion 102 and the lower concave surface of the circular recess 101 is 1.0mm-1.5mm, which can not only reduce the difficulty of molding the plastic bottle cap, but also ensure that the bottle cap body 1 has a certain amount of sinking under the action of external air pressure, thereby ensuring that the vacuum degree inside the plastic bottle can be reduced.
[0036] like Figure 4 As shown, the sealed plastic bottle cap further includes an anti-theft ring 8; the anti-theft ring 8 is detachably connected to the side wall of the bottle cap body 1. The provision of the anti-theft ring 8 helps consumers to determine whether the plastic bottle cap has been opened by others when purchasing goods, so that the goods purchased by consumers will not have food safety problems such as deterioration.
[0037] like Figure 4 and Figure 5 As shown, further, a plurality of reinforcing ribs 9 are distributed on the inner side wall of the anti-theft ring 8 along the circumference of the anti-theft ring 8. The provision of the reinforcing ribs 9 can ensure that the anti-theft ring 8 is not easily damaged during the transportation of the goods. At the same time, the provision of the reinforcing ribs 9 can also reduce the use of raw materials, so that the anti-theft ring 8 does not need to be set to a thicker thickness.
[0038] The utility model provides a plastic bottle, comprising any of the aforementioned sealed plastic bottle caps. Since the sealed plastic bottle cap provided by the utility model can not only seal the bottle mouth 4, but also reduce the deformation degree of the plastic bottle body and the bottle mouth 4, the plastic bottle provided by the utility model can be widely used in hot filling production lines.
[0039] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the claims attached to the utility model.
Claims
1. A sealed plastic bottle cap, comprising a bottle cap body; characterized in that: An annular strip is provided on the inner side surface of the top wall of the bottle cap body; the annular strip is perpendicular to the top wall of the bottle cap body, and an annular inner cover is provided between the annular strip and the inner side wall of the bottle cap body; the annular inner cover is arranged on the upper end of the bottle mouth, and a sealing convex strip inclined downward is provided on the side of the annular inner cover facing the annular strip; an inclined surface for interference fit with the sealing convex strip is provided at the lower part of the annular strip; a convex block for interference fit with the inner wall of the bottle mouth is provided on the side of the sealing convex strip facing the inner wall of the bottle mouth; a sealing strip for interference fit with the outer wall of the bottle mouth is provided at the bottom of the annular inner cover.
2. The sealed plastic bottle cap according to claim 1, characterized in that: A circular concave portion is formed downward on the top wall of the bottle cap body; a circular convex portion is formed upward at the center of the circular concave portion.
3. The sealed plastic bottle cap according to claim 2, characterized in that: The thickness of the bottle cap body is 0.5mm-0.7mm.
4. The sealed plastic bottle cap according to claim 3, characterized in that: The distance H between the upper end of the circular protrusion and the lower concave surface of the circular concave portion is 1.0 mm-1.5 mm.
5. The sealed plastic bottle cap according to claim 1, characterized in that: It also includes an anti-theft ring; the anti-theft ring is detachably connected to the side wall of the bottle cap body.
6. The sealed plastic bottle cap according to claim 5, characterized in that: A plurality of reinforcing ribs are distributed on the inner side wall of the anti-theft ring along the circumference of the anti-theft ring.
7. A plastic bottle, characterized in that: The invention comprises the sealed plastic bottle cap according to any one of claims 1 to 6.