Pressure-resistant polymer water bottle cap based on three-piece strong buckle and preparation method thereof

Abstract

The present invention relates to a pressure-resistant polymer water bottle cap based on a three-piece strong buckle and a preparation method thereof. The invention is designed to solve the technical problems of the inconvenience of production and assembly and the difficulty of automated assembly production of existing similar products. The water bottle cap comprises a cover plate, an outer cover and an inner liner. The outer diameter of the inner liner in the outer cover is provided with a weighting block. The key point is that one end of the weighting block is limited to a stepped groove in the outer cover where the outer diameter of the upper end of the inner liner is reduced. The cover plate is buckled and fixed to the top cover opening of the outer cover. At the same time, the cover plate opening at the bottom of the inner cover plate of the outer cover abuts against the other end of the weighting block. The weighting block is clamped and fixed to the outer diameter of the upper end of the inner liner in the outer cover. The upper end surface of the top of the cover plate covers the top cover opening of the outer cover. The upper end surface diameter of the top of the cover plate is larger than the cover plate opening diameter of the bottom of the cover plate. The upper end of the inner liner in the outer cover extends out of the top of the weighting block, and the outer diameter of the extended end of the inner liner is provided with multi-layer buckle ribs distributed at equal intervals. The inner diameter of the cover plate opening of the cover plate is connected to the multi-layer buckle ribs of the inner liner through multi-layer buckle grooves distributed at equal intervals.

Description

Technical Field

[0001] The invention relates to a bottle cap for cosmetics, in particular to a pressure-resistant polymer water bottle cap based on a three-piece strong buckle and a preparation method thereof. Background Art

[0002] A bottle cap is a sealing member used to seal containers such as bottles. Depending on their function, they come in various shapes and methods of operation. For example, mineral water bottle caps are round and twist-on, while can caps are ring-shaped and pull-on. Some cosmetic caps typically use internal and external threads that tighten or snap shut. The caps of vacuum flasks and other cosmetic products primarily serve to isolate the liquid from external temperatures and bacteria. To enhance grip comfort, some existing caps incorporate weighted structures. For example, Chinese patent application No. 201920305204.4, published on January 31, 2020, and titled "A Palm-Twistable Perfume Bottle Cap"; and Chinese patent application No. 201920305207.8, published on January 14, 2020, and titled "A Perfume Bottle Cap." However, the production and assembly of these and similar products is inconvenient and difficult to automate. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the present invention aims to provide a pressure-resistant polymer water bottle cap with an external spring and a three-piece strong buckle, and a method for preparing the same. This method addresses the technical issues of existing similar products, such as the inconvenience of production and assembly, the difficulty of automated assembly, and the need for further improvement in the materials used in their preparation. This objective is achieved through the following technical solution.

[0004] A pressure-resistant polymer water bottle cap based on a three-piece strong buckle design comprises a cover plate, an outer cover, and an inner liner. The outer diameter of the buckle rib at the bottom opening of the inner liner is buckled and fixed to the lower buckle groove at the inner diameter of the outer cover's bottom cover opening. The cover plate is buckled and fixed to the upper buckle rib at the top cover opening of the outer cover. A weight block is provided on the outer diameter of the inner liner within the outer cover. The key structural design features are that one end of the weight block is restrained within a stepped groove in the outer cover where the outer diameter of the upper end of the inner liner is reduced. While the cover plate is buckled and fixed to the top cover opening of the outer cover, the cover plate opening at the bottom of the inner cover plate abuts against the other end of the weight block. The weight block is clamped and fixed to the outer diameter of the upper end of the inner liner within the outer cover. The upper end surface of the cover plate covers the top cover opening of the outer cover, and the upper end surface of the cover plate has a larger diameter than the cover plate opening at the bottom of the cover plate. Thus, the outer cover, cover plate, and inner liner are buckled and connected as one, while the weight block is fixed within the outer cover.

[0005] The upper end of the inner lining in the outer cover extends beyond the top of the weight block, and the outer diameter of the inner lining's extended end is provided with evenly spaced, multi-layered buckling ribs. The outer diameter of the cover plate's opening is fastened to the outer cover's top opening, while the inner diameter of the cover plate's opening is connected to the inner lining's multi-layered buckling ribs via evenly spaced, multi-layered buckling grooves. The above-described specific buckling method and structural design for the cover plate and outer cover enhance the stability of the two after buckling.

[0006] The outer diameter of the bottom opening of the inner liner is provided with an outer flange. When the inner liner and the outer cover are buckled together, the outer cover is limited to the outer flange of the inner liner. The above structural design facilitates position limiting and positioning during automated assembly and protects the bottom cover opening of the outer cover.

[0007] The outer cap is provided with equidistantly spaced anti-rotation ribs on the inner wall between the upper buckle rib at the top cover opening and the lower buckle groove at the bottom cover opening. When the inner liner and outer cap are fastened together, the positioning ribs on the outer diameter of the inner liner engage with the anti-rotation ribs inside the outer cap to prevent rotation. This structure prevents rotation between the outer cap and the inner liner after assembly. Whether or not the anti-rotation structure is provided has little impact on the use of the water bottle cap in the following fastening methods, while also facilitating automated production and assembly of both.

[0008] The inner wall of the liner is correspondingly narrowed at the stepped groove, and the inner wall below the stepped groove is provided with two symmetrically raised snap grooves, with strip grooves provided between the snap grooves. The snap strips and the strip grooves are each provided with a guide groove facing the inner wall of the stepped groove. This structural design facilitates engagement with the corresponding protrusion at the bottle mouth, or allows for placement of a straw, dropper, or cotton swab within the small circle at the top of the liner. Furthermore, based on the above structural features, the snap grooves, strip grooves, and guide grooves of the liner can also be replaced with internal threads.

[0009] The outer diameter of the outer cover is provided with equidistant and evenly distributed raised anti-slip sharp teeth. The above structure improves the hand feeling of the outer cover after holding it, and the texture of its outer diameter is not limited to the above structural design.

[0010] The top of the outer cover's upper buckle rib is provided with an annular glue-dispensing groove. The gap between the annular glue-dispensing groove and the outer cover and cover plate at the buckle connection forms a glue-dispensing cavity. The inner wall of the outer cover is provided with a glue-filling surface. The above structure can also be further glued together to secure the outer cover, weight block, and cover plate together as a whole.

[0011] After the weight block is inserted into the inner lining, it is pressed into place to the step groove, the outer cover is put on the inner lining, and the lower buckle groove of the outer cover and the buckle rib of the inner lining are buckled in; then the cover piece is pressed down from the top, and the cover piece and the inner lining are buckled in, and the overall assembly can be completed.

[0012] The lining is a pressure-resistant polymer lining, and the components and weight ratio of the pressure-resistant polymer material of the pressure-resistant polymer lining are: 50-85 parts of thermoplastic polyurethane elastomer, 15-30 parts of light calcium carbonate, 3-8 parts of composite stabilizer, 0.5-4 parts of coupling agent, 0.5-3 parts of lubricant, 0.5-2 parts of compatibilizer, 0.2-0.6 parts of antioxidant, and 0.1-0.5 parts of anti-hydrolysis agent; the thermoplastic polyurethane elastomer is selected from one or more of polyester polyurethane elastomer, polyether polyurethane elastomer, aliphatic polyurethane elastomer, and polycarbonate polyurethane elastomer; the composite stabilizer is yttrium naphthoate, di(2-ethylhexyl)phosphoric acid, A mixture of ester and sulfur, wherein the mass ratio of yttrium naphthoate, di(2-ethylhexyl) phosphate and sulfur is 1:0.1-0.3:2-3; the coupling agent is a titanate coupling agent; the lubricant is a mixture of one or more of polypropylene wax, stearic acid, and bisstearamide (EBS); the compatibilizer is maleic anhydride grafted polypropylene; the antioxidant is selected from one or more of antioxidant 1010, antioxidant 1076, antioxidant 1135, antioxidant 1098, antioxidant 168, and antioxidant 618; and the anti-hydrolysis agent is selected from one or more of bis(2,6-diisopropylphenyl)carbodiimide, carbodiimide, and polycarbodiimide.

[0013] The composite stabilizer, coupling agent, lubricant, compatibilizer, antioxidant, and anti-hydrolysis agent are added to a transparent reaction kettle and dissolved. After being banburyed at a temperature of 160-190° C. for 15-30 minutes, the composite stabilizer, coupling agent, lubricant, compatibilizer, antioxidant, and anti-hydrolysis agent are added to a twin-screw extruder together with a thermoplastic polyurethane elastomer and light calcium carbonate. The main screw speed of the twin-screw extruder is 60-120 rpm, preferably 90 rpm; the feeder speed is 3-8 rpm, preferably 5 rpm; the temperature of zone 1 in the barrel is 350° C., the temperature of zones 2 and 3 is 360° C., and the temperature of zones 4 to 8 is set to 370° C. The materials are melted, extruded, and granulated in the twin-screw extruder to obtain the pressure-resistant polymer material.

[0014] The invention has a reasonable structural design and is easy to use and produce, especially convenient for automated production and assembly, and convenient for opening as a lid of a cosmetic bottle body, and the preparation method is feasible; it is suitable for use as a pressure-resistant polymer water bottle cap based on a three-piece strong buckle, and is a structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the explosion state of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the sectional structure after assembly.

[0017] Figure 3 yes Figure 2Schematic diagram of the cross-sectional structure of the fixed state of the dispensing point, in which part A is framed.

[0018] Figure 4 yes Figure 3 Magnified view of part A.

[0019] Serial number and name of the accompanying drawings: 1. Inner lining, 101. Buckle rib, 102. Step groove, 103. Outer flange, 104. Buckle groove, 105. Strip groove, 2. Weight block, 3. Outer cover, 301. Lower buckle groove, 302. Upper buckle rib, 303. Anti-rotation rib, 4. Cover piece, 401. Cover piece opening, 402. Upper end face. Implementation Method

[0020] Now, the structure and use of the present invention will be further described in conjunction with the accompanying drawings. Figure 1-Figure 2 As shown, the water bottle cap includes a cover plate 4, an outer cover 3, a weight block 2 and an inner liner 1. The outer diameter of the buckle rib 101 at the bottom opening of the inner liner is buckled and fixed to the lower buckle groove 301 at the inner diameter of the bottom cover opening of the outer cover. The cover plate is buckled and fixed to the upper buckle rib 302 at the top cover opening of the outer cover. A weight block is provided on the outer diameter of the inner liner in the outer cover. One end of the weight block is limited to the step groove 102 with a reduced outer diameter at the upper end of the inner liner in the outer cover. At the same time, the cover plate is buckled and fixed to the top cover opening of the outer cover, and the cover plate opening 401 at the bottom of the inner cover plate of the outer cover abuts against the other end of the weight block. The weight block is clamped and fixed to the outer diameter of the upper end of the inner liner in the outer cover. The upper end surface 402 of the top of the cover plate covers the top cover opening of the outer cover. The diameter of the upper end surface of the top of the cover plate is larger than the diameter of the cover plate opening at the bottom of the cover plate. The upper end of the inner lining of the outer cover extends beyond the top of the weight block, and the outer diameter of the inner lining's extended end is provided with evenly spaced, multi-layered buckling ribs. The outer diameter of the cover plate's flap is fastened to the outer cover's top flap, while the inner diameter of the cover plate's flap is connected to the inner lining's multi-layered buckling ribs via evenly spaced, multi-layered buckling grooves. The outer diameter of the inner lining's bottom opening is provided with an outer flange 103. When the inner lining and outer cover are fastened together, the outer cover is restrained by the outer flange of the inner lining.

[0021] At the same time, the inner wall between the upper buckle rib at the top cover opening and the lower buckle groove at the bottom cover opening of the outer cover is equipped with evenly spaced anti-rotation ribs 303. When the inner liner and outer cover are fastened together, the positioning ribs on the outer diameter of the inner liner engage with the anti-rotation ribs inside the outer cover to prevent rotation. The inner wall of the inner liner is correspondingly narrowed at the step groove. The inner wall below the step groove is equipped with two symmetrical raised buckle grooves 104. Strip grooves 105 are provided between the buckle grooves. The buckle strips and strip grooves are each equipped with guide grooves toward the inner wall of the step groove. The outer diameter of the outer cover is equipped with evenly spaced and raised anti-slip sharp teeth.

[0022] According to the above structural characteristics, such as Figure 3-Figure 4 As shown, an annular glue dispensing groove is provided on the top of the upper buckle rib of the above-mentioned outer cover, and the gap between the annular glue dispensing groove and the outer cover and the cover sheet at the buckling position constitutes a glue dispensing cavity. The inner wall of the outer cover is provided with a glue filling surface, and the above-mentioned components are further fixed by glue dispensing as needed.

[0023] Based on the above structural features, the specific assembly method of the water bottle cap is as follows: the weight block is inserted into the inner liner and pressed into place into the stepped groove. The outer cover is then inserted into the inner liner, and the lower buckle groove of the outer cover engages with the buckle ribs of the inner liner. The cover is then pressed downward from the top, and the multiple buckle grooves of the cover engage with the multiple buckle ribs of the inner liner to complete the overall assembly. When using the water bottle cap, the inner liner is simply inserted into the protrusion at the outer diameter of the bottle mouth by snapping.

[0024] The above-mentioned lining is a pressure-resistant polymer lining. The composition and weight ratio of the pressure-resistant polymer material of the pressure-resistant polymer lining are as follows: Example 1, 50 parts of thermoplastic polyurethane elastomer, 15 parts of light calcium carbonate, 3 parts of composite stabilizer, 0.5 part of coupling agent, 0.5 part of lubricant, 0.5 part of compatibilizer, 0.2 part of antioxidant, and 0.1 part of anti-hydrolysis agent; Example 2, 70 parts of thermoplastic polyurethane elastomer, 20 parts of light calcium carbonate, 6 parts of composite stabilizer, 2 parts of coupling agent, 1 part of lubricant, 1 part of compatibilizer, 0.4 part of antioxidant, and 0.3 part of anti-hydrolysis agent; Example 3, 85 parts of thermoplastic polyurethane elastomer, 30 parts of light calcium carbonate, 8 parts of composite stabilizer, 4 parts of coupling agent, 3 parts of lubricant, 2 parts of compatibilizer, 0.6 part of antioxidant, and 0.5 part of anti-hydrolysis agent.

[0025] The thermoplastic polyurethane elastomer is selected from one or more of polyester polyurethane elastomer, polyether polyurethane elastomer, aliphatic polyurethane elastomer, and polycarbonate polyurethane elastomer; the composite stabilizer is a mixture of yttrium naphthoate, di(2-ethylhexyl) phosphate, and sulfur, and the mass ratio of yttrium naphthoate, di(2-ethylhexyl) phosphate, and sulfur is 1:0.1-0.3:2-3; the coupling agent is a titanate coupling agent; the lubricant is a mixture of one or more of polypropylene wax, stearic acid, and bisstearamide (EBS); the compatibilizer is maleic anhydride grafted polypropylene; the antioxidant is selected from one or more of antioxidant 1010, antioxidant 1076, antioxidant 1135, antioxidant 1098, antioxidant 168, and antioxidant 618; and the anti-hydrolysis agent is selected from one or more of bis(2,6-diisopropylphenyl)carbodiimide, carbodiimide, and polycarbodiimide.

[0026] The composite stabilizer, coupling agent, lubricant, compatibilizer, antioxidant, and anti-hydrolysis agent are added to a transparent reaction kettle and dissolved. After being banburyed at a temperature of 160-190°C for 15-30 minutes, they are added to a twin-screw extruder together with a thermoplastic polyurethane elastomer and light calcium carbonate. The main screw speed of the twin-screw extruder is 60-120 rpm, preferably 90 rpm; the feeder speed is 3-8 rpm, preferably 5 rpm; the temperature of zone 1 in the barrel is 350°C, the temperature of zones 2 and 3 is 360°C, and the temperature of zones 4 to 8 is set to 370°C. The materials are melted, extruded, and granulated in the twin-screw extruder to obtain the pressure-resistant polymer material.

Claims

1. A pressure-resistant polymer water bottle cap based on a three-piece strong buckle, the water bottle cap comprising a cover plate (4), an outer cover (3) and an inner liner (1), wherein the outer diameter of the buckle rib (101) at the bottom opening of the inner liner is buckled and fixed to the lower buckle groove (301) at the inner diameter of the bottom cover opening of the outer cover, the cover plate is buckled and fixed to the upper buckle rib (302) at the top cover opening of the outer cover, and a weight block (2) is provided on the outer diameter of the inner liner in the outer cover; One end of the weighting block (2) is limited to the stepped groove (102) where the outer diameter of the upper end of the inner lining (1) in the outer cover (3) is reduced. The cover piece (4) is fastened and fixed to the top cover opening of the outer cover. At the same time, the cover piece opening (401) at the bottom of the inner cover piece of the outer cover abuts against the other end of the weighting block. The weighting block clamps and fixes the outer diameter of the upper end of the inner lining in the outer cover. The upper end surface (402) of the top of the cover piece covers the top cover opening of the outer cover. The diameter of the upper end surface of the top of the cover piece is larger than the diameter of the cover piece opening at the bottom of the cover piece. The upper end of the inner lining (1) in the outer cover (3) extends out of the top of the weighting block (2), and the outer diameter of the extended end of the inner lining is provided with multi-layer buckle ribs distributed at equal intervals. At the same time, the outer diameter of the cover piece opening (401) of the cover piece (4) is fastened and fixed to the top cover opening of the outer cover (3), and the inner diameter of the cover piece opening of the cover piece is connected to the multi-layer buckle ribs of the inner lining through multi-layer buckle grooves distributed at equal intervals.

2. The pressure-resistant polymer water bottle cap based on the three-piece strong buckle according to claim 1 is characterized in that The outer diameter of the bottom opening of the inner lining (1) is provided with an outer flange (103), and when the inner lining and the outer cover (3) are buckled together, the outer cover is limited to the outer flange of the inner lining.

3. The pressure-resistant polymer water bottle cap based on the three-piece strong buckle according to claim 1 is characterized in that The inner wall between the upper buckle rib (302) at the top cover opening and the lower buckle groove (301) at the bottom cover opening of the outer cover (3) is provided with equidistantly distributed anti-rotation ribs (303). When the inner lining (1) is fastened to the outer cover, the positioning rib on the outer diameter of the inner lining is engaged with the anti-rotation rib inside the outer cover to prevent rotation.

4. The pressure-resistant polymer water bottle cap based on the three-piece strong buckle according to claim 1 is characterized in that The inner wall of the step groove (102) of the lining (1) is correspondingly narrowed, and the inner wall below the step groove is provided with two symmetrically raised snap grooves (104), and strip grooves (105) are respectively provided between the snap grooves, and the snap strips and the strip grooves are respectively provided with guide grooves facing the inner wall of the step groove.

5. The pressure-resistant polymer water bottle cap based on the three-piece strong buckle according to claim 1 is characterized in that The outer diameter of the outer cover (3) is provided with equidistant, evenly distributed and raised anti-slip sharp teeth.

6. The pressure-resistant polymer water bottle cap based on the three-piece strong buckle according to claim 1 is characterized in that An annular glue dispensing groove is provided on the top of the upper buckle rib (302) of the outer cover (3), and the gap between the annular glue dispensing groove and the outer cover and the cover plate (4) at the buckling position forms a glue dispensing cavity, and the inner wall of the outer cover is provided with a glue filling surface.

7. The assembly method of the pressure-resistant polymer water bottle cap based on the three-piece strong buckle according to claim 1 is characterized in that The weight block (2) is inserted into the inner lining (1) and pressed into place to the step groove (102), and the outer cover (3) is placed on the inner lining, and the lower buckle groove (301) of the outer cover and the buckle rib (101) of the inner lining are buckled in cooperation; then the cover piece is pressed downward from the top, and the cover piece and the inner lining are buckled in cooperation, and the overall assembly is completed.

8. The method for preparing a pressure-resistant polymer water bottle cap based on a three-piece strong buckle according to claim 1, characterized in that The lining (1) is a pressure-resistant polymer lining, and the components and weight ratio of the pressure-resistant polymer material of the pressure-resistant polymer lining are: 50-85 parts of thermoplastic polyurethane elastomer, 15-30 parts of light calcium carbonate, 3-8 parts of composite stabilizer, 0.5-4 parts of coupling agent, 0.5-3 parts of lubricant, 0.5-2 parts of compatibilizer, 0.2-0.6 parts of antioxidant, and 0.1-0.5 parts of anti-hydrolysis agent; the thermoplastic polyurethane elastomer is selected from one or more of polyester polyurethane elastomer, polyether polyurethane elastomer, aliphatic polyurethane elastomer, and polycarbonate polyurethane elastomer; the composite stabilizer is yttrium naphthoate, di(2-ethylhexyl) A mixture of phosphate and sulfur, wherein the mass ratio of yttrium naphthoate, di(2-ethylhexyl) phosphate and sulfur is 1:0.1-0.3:2-3; the coupling agent is a titanate coupling agent; the lubricant is a mixture of one or more of polypropylene wax, stearic acid, and bisstearamide (EBS); the compatibilizer is maleic anhydride grafted polypropylene; the antioxidant is selected from one or more of antioxidant 1010, antioxidant 1076, antioxidant 1135, antioxidant 1098, antioxidant 168, and antioxidant 618; and the anti-hydrolysis agent is selected from one or more of bis(2,6-diisopropylphenyl)carbodiimide, carbodiimide, and polycarbodiimide.

9. The method for preparing a pressure-resistant polymer water bottle cap based on a three-piece strong buckle according to claim 8, characterized in that The composite stabilizer, coupling agent, lubricant, compatibilizer, antioxidant, and anti-hydrolysis agent are added to a transparent reaction kettle for dissolution, and after banburying at a temperature of 160-190° C. for 15-30 minutes, they are added to a twin-screw extruder together with a thermoplastic polyurethane elastomer and light calcium carbonate. The main screw speed of the twin-screw extruder is 60-120 rpm, and the feeder speed is 3-8 rpm. The temperature of zone 1 in the barrel is 350° C., the temperature of zones 2 and 3 is 360° C., and the temperature of zones 4 to 8 is set to 370° C. The materials are melted, extruded, and granulated in the twin-screw extruder to obtain the pressure-resistant polymer material.

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