Paper-plastic bottle cap and bottle assembly

Abstract

The utility model provides a paper-plastic bottle cap and a bottle assembly. The paper-plastic bottle cap comprises a paper-plastic cap body, the paper-plastic cap body comprises a bottom and a side part which are connected in a bent mode, the side part is arranged around the periphery of the bottom, and a containing cavity is defined by the bottom and the side part; the paper-plastic thread layer is arranged around the inner side wall of the side part, the paper-plastic thread layer comprises a body part and a spiral protruding part, the spiral protruding part protrudes in the direction away from the side part relative to the body part, and the spiral protruding part is spirally arranged around the side part; and the bonding layer is positioned between the side part and the paper-plastic thread layer and is used for bonding the paper-plastic thread layer to the surface, facing the accommodating cavity, of the side part. The paper-plastic bottle cap provided by the embodiment of the utility model has degradability and better sealing performance, and can better prevent liquid leakage of a bottle body when the paper-plastic bottle cap is mounted on the bottle body.

Description

Technical Field

[0001] The present application relates to the field of paper plastics, and in particular to a paper plastic bottle cap and bottle assembly. Background Art

[0002] As people's living standards improve, portable drinks, solid food, etc. are used more and more frequently. These drinks or foods need to be placed in bottles, and most of these bottles are made of plastic, resulting in a large amount of plastic lid waste. Improper handling can easily pollute the environment. Utility Model Content

[0003] The embodiment of the present application provides a paper-plastic bottle cap, which is biodegradable and has good sealing performance. When installed on a bottle body, it can better prevent the bottle body from leaking.

[0004] A first embodiment of the present application provides a paper-plastic bottle cap, comprising:

[0005] A paper-plastic cover, the paper-plastic cover comprising a bottom and side portions connected by bending, the side portions being arranged around the periphery of the bottom, the bottom and the side portions enclosing a receiving cavity;

[0006] a paper-plastic thread layer, the paper-plastic thread layer being arranged around the inner side wall of the side portion, the paper-plastic thread layer comprising a main body portion and a spiral protrusion portion, the spiral protrusion portion protruding in a direction away from the side portion relative to the main body portion, and the spiral protrusion portion being spirally arranged around the side portion; and

[0007] An adhesive layer is located between the side portion and the paper-plastic thread layer, and is used to adhere the paper-plastic thread layer to the surface of the side portion facing the accommodating cavity.

[0008] Furthermore, a height h1 of the spiral protrusion compared to the main body is in the range of 1.3 mm ≤ h1 ≤ 1.5 mm.

[0009] Furthermore, the line width s1 of the spiral protrusion is in the range of 3.4 mm ≤ s1 ≤ 3.7 mm.

[0010] Furthermore, the lead angle α of the spiral protrusion is in the range of 6°≤α≤7°.

[0011] Furthermore, the tooth angle β of the spiral protrusion is in the range of 28°≤β≤35°.

[0012] Furthermore, the bottom includes a connecting sub-portion and a boss sub-portion, the connecting sub-portion is arranged around the outer periphery of the boss sub-portion, the end of the connecting sub-portion facing away from the boss sub-portion is connected to the side portion, and the boss sub-portion protrudes toward the accommodating cavity compared to the connecting sub-portion; along the arrangement direction of the boss sub-portion, the connecting sub-portion and the side portion, the distance D between the boss sub-portion and the threaded protrusion is in the range of 1.7mm≤D≤1.9mm.

[0013] Furthermore, the height h2 of the boss sub-part protruding from the connecting sub-part is in the range of 3.4 mm ≤ h2 ≤ 3.6 mm;

[0014] and / or,

[0015] The range of the distance s2 between the main body portion and the boss portion is 3.0 mm ≤ s2 ≤ 3.2 mm;

[0016] and / or,

[0017] The ratio h2 / h between the height h2 of the boss sub-part protruding from the connecting sub-part and the height h of the paper-plastic bottle cap is in the range of 0.4≤h2 / h≤0.5.

[0018] Furthermore, the paper-plastic thread layer includes a first threaded member and a second threaded member, and the first threaded member and the second threaded member are adjacent to each other and arranged end to end around the surface of the side facing the accommodating cavity; the first threaded member includes a first body sub-portion and a first spiral protrusion sub-portion, and the first spiral protrusion sub-portion protrudes in a direction away from the side compared to the first body sub-portion; the second threaded member includes a second body sub-portion and a second spiral protrusion sub-portion, and the second spiral protrusion sub-portion protrudes in a direction away from the side compared to the second body sub-portion, wherein the body portion includes the first body sub-portion and the second body sub-portion, and the spiral protrusion portion includes the first spiral protrusion sub-portion and the second spiral protrusion sub-portion.

[0019] Furthermore, the thickness of the paper-plastic cover is in the range of 0.8 mm to 1 mm; the thickness of the paper-plastic thread layer is in the range of 0.6 mm to 0.8 mm;

[0020] The paper-plastic cover also includes a plurality of anti-slip parts, which are arranged at intervals around the outer circumference of the side part. Along the circumferential direction of the side part, the width of the anti-slip part ranges from 0.4mm to 0.8mm; the spacing between two adjacent anti-slip parts ranges from 0.95mm to 1.35mm; and the thickness of the anti-slip part ranges from 0.05mm to 0.4mm.

[0021] A second embodiment of the present application provides a bottle assembly, the bottle assembly comprising:

[0022] a bottle body, for containing a target object, the bottle body comprising a bottle mouth, the bottle mouth having an external thread; and

[0023] The paper-plastic bottle cap described in the embodiment of the first aspect of the present application is threadedly connected to the bottle mouth.

[0024] The paper-plastic bottle cap of the embodiment of the present application includes a paper-plastic cap body, a paper-plastic thread layer and an adhesive layer. The paper-plastic cap body includes a bottom and a side portion that are connected by bending, the side portion is arranged around the outer periphery of the bottom, and the bottom and the side portion enclose a receiving cavity; the paper-plastic thread layer is arranged around the inner side wall of the side portion, and the paper-plastic thread layer includes a main body portion and a spiral protrusion portion, the spiral protrusion portion protrudes in a direction away from the side portion compared to the main body portion, and the spiral protrusion portion is spirally arranged around the side portion; the adhesive layer is located between the side portion and the paper-plastic thread layer, and is used to adhere the paper-plastic thread layer to the surface of the side portion facing the receiving cavity. The paper-plastic cap body and the paper-plastic thread layer of the paper-plastic bottle cap of the present application are both made of degradable plant fibers, so that the paper-plastic bottle cap is degradable and will not cause pollution to the environment after being discarded. In addition, the paper-plastic bottle cap of the embodiment of the present application is provided with a paper-plastic thread layer inside the paper-plastic cap body, so that when the paper-plastic bottle cap is applied to the bottle assembly, it can be threadedly connected to the bottle body, thereby improving the stability and sealing of the connection between the paper-plastic bottle cap and the bottle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of a paper-plastic bottle cap according to an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the planar structure of a paper-plastic bottle cap according to an embodiment of the present application.

[0028] Figure 3 This is a schematic diagram of a partial explosion structure of a paper-plastic bottle cap according to an embodiment of the present application.

[0029] Figure 4 This is a schematic top view of the paper-plastic bottle cap according to one embodiment of the present application.

[0030] Figure 5 This is the edge of the paper-plastic bottle cap of an embodiment of the present application Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0031] Figure 6The paper-plastic thread layer of one embodiment of the present application is Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0032] Figure 7 The paper-plastic cover of one embodiment of the present application is Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of a bottle assembly according to an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100-paper plastic bottle cap, 10-paper plastic cap body, 11-bottom, 111-connecting sub-part, 112-boss sub-part, 12-side, 13-accommodating cavity, 20-paper plastic threaded layer, 21-main body, 22-spiral protrusion, 23-first threaded member, 231-first main body sub-part, 232-first spiral protrusion sub-part, 24-second threaded member, 241-second main body sub-part, 242-second spiral protrusion sub-part, 30-adhesive layer, 40-anti-slip part, 200-bottle assembly, 210-bottle body, 211-bottle mouth. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0038] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0039] It should be noted that, for the convenience of description, in the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted.

[0040] As people's living standards improve, portable drinks, solid food, etc. are used more and more frequently. These drinks or foods need to be placed in bottles, and most of these bottles are made of plastic, resulting in a large amount of plastic lid waste. Improper handling can easily pollute the environment.

[0041] Figure 1 It is a schematic diagram of the three-dimensional structure of a paper-plastic bottle cap 100 according to an embodiment of the present application. Figure 2 Schematic diagram of the planar structure of a paper-plastic bottle cap 100 according to an embodiment of the present application. Figure 3 It is a schematic diagram of a partial explosion structure of a paper-plastic bottle cap 100 according to an embodiment of the present application.

[0042] See Figures 1 to 3 The embodiment of the present application provides a paper plastic bottle cap 100, which includes a paper plastic cap body 10, a paper plastic thread layer 20, and an adhesive layer 30. The paper plastic cap body 10 includes a bottom 11 and a side portion 12 that are connected by bending, and the side portion 12 is arranged around the outer periphery of the bottom 11, and the bottom 11 and the side portion 12 enclose a receiving cavity 13; the paper plastic thread layer 20 is arranged around the inner side wall of the side portion 12, and the paper plastic thread layer 20 includes a main body 21 and a spiral protrusion 22, and the spiral protrusion 22 protrudes in a direction away from the side portion 12 compared to the main body 21, and the spiral protrusion 22 is spirally arranged around the side portion 12; the adhesive layer 30 is located between the side portion 12 and the paper plastic thread layer 20, and is used to bond the paper plastic thread layer 20 to the surface of the side portion 12 facing the receiving cavity 13.

[0043] The paper-plastic bottle cap 100 of the present embodiment can be used as a bottle cap for a bottle assembly, used to seal the bottle opening to prevent leakage of a target object within the bottle. When used to seal the bottle opening, the paper-plastic bottle cap 100 is fitted over the bottle opening and threadedly connected to the bottle opening. Optionally, the target object can be, but is not limited to, a liquid such as water, beverages, or milk. The target object can also be a solid such as milk powder, protein powder, or flour.

[0044] It should be noted that the bottom portion 11 is a circular structure, and the side portion 12 is a cylindrical structure.

[0045] It should be noted that the "paper plastic" in this application refers to a product prepared by a pulp molding process using degradable plant fibers such as wood, bamboo, bagasse, reeds, straw, hemp stalks, and crop stalks.

[0046] Optionally, the paper-plastic bottle cap 100 of the embodiment of the present application can be prepared using degradable materials such as wood, bamboo, bagasse, reed, straw, hemp stalks, and crop straw.

[0047] Optionally, the bottom 11 and the side 12 are an integral structure, and the bottom 11 and the side 12 are formed in the same process. The bottom 11 and the side 12 are both made of paper plastic material.

[0048] Optionally, the main body 21 and the spiral protrusion 22 are an integral structure, and the main body 21 and the spiral protrusion 22 are formed in the same manufacturing process.

[0049] Optionally, a side of the spiral protrusion 22 facing the side portion 12 is recessed in the main body 21 , so that a side of the spiral protrusion 22 facing away from the side portion 12 protrudes from the main body 21 .

[0050] Optionally, the material of the adhesive layer 30 may be, but is not limited to, a degradable adhesive such as white latex.

[0051] Optionally, the number of the spiral protrusions 22 is multiple, and the multiple spiral protrusions 22 are spaced apart around the inner circumference of the paper-plastic thread layer 20. Specifically, the number of the spiral protrusions 22 can be two, three, four, five, etc. In the illustration of the present application, the number of the spiral protrusions 22 is three.

[0052] The paper plastic bottle cap 100 of the embodiment of the present application includes a paper plastic cap body 10, a paper plastic thread layer 20 and an adhesive layer 30. The paper plastic cap body 10 includes a bottom 11 and a side portion 12 connected by bending, the side portion 12 is arranged around the outer periphery of the bottom 11, and the bottom 11 and the side portion 12 enclose a receiving cavity 13; the paper plastic thread layer 20 is arranged around the inner side wall of the side portion 12, the paper plastic thread layer 20 includes a main body 21 and a spiral protrusion 22, the spiral protrusion 22 protrudes in a direction away from the side portion 12 compared to the main body 21, and the spiral protrusion 22 is spirally arranged around the side portion 12; the adhesive layer 30 is located between the side portion 12 and the paper plastic thread layer 20, and is used to bond the paper plastic thread layer 20 to the surface of the side portion 12 facing the receiving cavity 13. The paper plastic bottle cap 100 of the present application is made of a paper plastic cap body 10 and a paper plastic thread layer 20 made of degradable plant fibers. Thus, the paper plastic bottle cap 100 is degradable and will not pollute the environment after being discarded. Furthermore, the paper plastic bottle cap 100 of the present application embodiment is provided with a paper plastic thread layer 20 within the paper plastic cap body 10, so that when the paper plastic bottle cap 100 is applied to a bottle assembly, it can be threadedly connected to the bottle body, thereby improving the stability and sealing of the connection between the paper plastic bottle cap 100 and the bottle body.

[0053] Figure 4 1 is a schematic top view of the paper-plastic bottle cap 100 according to an embodiment of the present application. Figure 5 The paper-plastic bottle cap 100 of one embodiment of the present application is Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0054] See Figure 4 and Figure 5 In some embodiments, the height h1 of the spiral protrusion 22 compared to the main body 21 is in the range of 1.3 mm ≤ h1 ≤ 1.5 mm.

[0055] The height direction of the paper-plastic bottle cap 100 is defined as the first direction (ie, the direction perpendicular to the bottom 11 is the first direction), and the stacking direction of the side 12 and the paper-plastic thread layer 20 is defined as the second direction. The first direction is perpendicular to the second direction.

[0056] It can be understood that, along the second direction, the height h1 of the spiral protrusion 22 protruding from the body 21 is in the range of 1.3 mm ≤ h1 ≤ 1.5 mm. In other words, the height h1 of the spiral protrusion 22 protruding toward the accommodating cavity 13 is in the range of 1.3 mm ≤ h1 ≤ 1.5 mm.

[0057] Specifically, the height h1 of the spiral protrusion 22 compared to the main body 21 can be, but is not limited to, 1.3 mm, 1.32 mm, 1.35 mm, 1.38 mm, 1.4 mm, 1.42 mm, 1.45 mm, 1.48 mm, 1.5 mm, etc.

[0058] In this embodiment, if the height h1 of the spiral protrusion 22 compared to the main body 21 is too small, when the paper plastic bottle cap 100 is applied to the bottle, the thread engagement area of ​​the thread is reduced during the threaded connection between the paper plastic bottle cap 100 and the bottle mouth, resulting in a decrease in connection strength and a tendency for the paper plastic bottle cap 100 to loosen or even fall off under vibration or impact loads. In addition, if the height h1 of the spiral protrusion 22 compared to the main body 21 is too small, the sealing performance of the threaded connection between the paper plastic bottle cap 100 and the bottle mouth is affected, making the bottle assembly prone to leakage problems; furthermore, the thread is prone to slippage or skipping. If the height h1 of the spiral protrusion 22 compared to the main body 21 is too large, when the paper plastic bottle cap 100 is applied to the bottle, greater force is required to assemble the paper plastic bottle cap 100 to the bottle mouth, causing the paper plastic bottle cap 100 to deform or break during the assembly process.

[0059] In some embodiments, the line width s1 of the spiral protrusion 22 is in the range of 3.4 mm ≤ s1 ≤ 3.7 mm.

[0060] Specifically, the line width s1 of the spiral protrusion 22 can be, but is not limited to, 3.4 mm, 3.43 mm, 3.45 mm, 3.48 mm, 3.5 mm, 3.53 mm, 3.55 mm, 3.58 mm, 3.60 mm, 3.63 mm, 3.65 mm, 3.68 mm, 3.7 mm, etc.

[0061] In this embodiment, since the spiral protrusion 22 of the paper plastic thread layer 20 is formed by molding, and the paper plastic thread layer 20 is a structure of uniform thickness, if the line width s1 of the spiral protrusion 22 is too small, the difficulty of preparing the thread protrusion will be increased; in addition, if the line width s1 of the spiral protrusion 22 is too small, it will also cause the paper plastic bottle cap 100 to be easily screwed onto the bottle mouth of the bottle body. Slipping or jumping of the teeth may occur, affecting the sealing effect of the paper plastic bottle cap 100 on the bottle mouth; if the line width s1 of the spiral protrusion 22 is too large, it will easily make the paper plastic bottle cap 100 unable to tighten the bottle mouth of the bottle body, or even if it is screwed in, it will reduce the stability and sealing of the connection between the paper plastic bottle cap 100 and the bottle body.

[0062] Furthermore, the line width s1 of the spiral protrusion 22 is in the range of 3.45 mm ≤ s1 ≤ 3.65 mm. This allows the paper plastic bottle cap 100 to be better threadedly connected to the bottle mouth, and provides a better seal to the bottle, thereby better preventing the bottle from leaking.

[0063] Figure 6 The paper-plastic thread layer 20 of one embodiment of the present application is Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0064] See Figure 6 In some embodiments, the lead angle α of the spiral protrusion 22 is in the range of 6°≤α≤7°.

[0065] Specifically, the lead angle α of the spiral protrusion 22 can be, but is not limited to, 6.1°, 6.2°, 6.3°, 6.4°, 6.5°, 6.6°, 6.7°, 6.8°, 6.9°, 7.0°, etc.

[0066] In this embodiment, if the lead angle α of the spiral protrusion 22 is too small, the thread will self-lock, that is, the thread cannot be unfastened by itself when subjected to external force, which will cause inconvenience in use when frequent disassembly is required; if the lead angle α of the spiral protrusion 22 is too small, the thread will have a greater screwing force, requiring a greater torque during installation, which may cause installation difficulties; if the lead angle α of the spiral protrusion 22 is too large, it will easily cause the threaded connection to become loose, or even loosen under vibration or impact loads, increasing the risk of equipment failure. In addition, a larger lead angle may affect the sealing performance of the thread, leading to leakage problems, especially in high pressure or sealing-required situations.

[0067] In some embodiments, the tooth angle β of the spiral protrusion 22 is in the range of 28°≤β≤35°.

[0068] Specifically, the tooth angle β of the spiral protrusion 22 can be, but is not limited to, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, etc.

[0069] In this embodiment, if the tooth profile angle β of the spiral protrusion 22 is too small, the strength and wear resistance of the spiral protrusion 22 will be weakened, making it easy to wear or damage during use. In addition, if the tooth profile angle β of the spiral protrusion 22 is too small, the self-locking performance of the thread will be reduced, which may cause the connection to become loose. If the tooth profile angle β of the spiral protrusion 22 is too large, the processing difficulty of the spiral protrusion 22 will increase, which may cause errors in the manufacturing process to increase. In addition, if the tooth profile angle β of the spiral protrusion 22 is too large, it may also affect the centering of the thread, resulting in an unstable connection. Furthermore, if the tooth profile angle β of the spiral protrusion 22 is too large, the clearance of the spiral protrusion 22 will be difficult to adjust and compensate after wear, affecting the service life and stability of the thread.

[0070] See Figure 5 and Figure 7 In some embodiments, the bottom portion 11 includes a connecting sub-portion 111 and a boss sub-portion 112. The connecting sub-portion 111 is disposed around the outer circumference of the boss sub-portion 112. An end of the connecting sub-portion 111 facing away from the boss sub-portion 112 is connected to the side portion 12. The boss sub-portion 112 protrudes toward the accommodating cavity 13 relative to the connecting sub-portion 111. Along the arrangement direction of the boss sub-portion 112, the connecting sub-portion 111, and the side portion 12, a distance D between the boss sub-portion 112 and the threaded protrusion is in the range of 1.7 mm ≤ D ≤ 1.9 mm.

[0071] It can be understood that the boss sub-portion 112 , the connecting sub-portion 111 and the side portion 12 are connected in sequence.

[0072] Optionally, a side of the boss portion 112 facing away from the accommodating cavity 13 has a recessed groove. In other words, the surface of the boss portion 112 facing away from the accommodating cavity 13 is recessed in the surface of the connecting portion 111 facing away from the accommodating cavity 13 .

[0073] Optionally, the connecting sub-portion 111 and the boss sub-portion 112 have the same thickness.

[0074] Specifically, the distance D between the boss sub-portion 112 and the threaded protrusion can be, but is not limited to, 1.7 mm, 1.72 mm, 1.74 mm, 1.76 mm, 1.78 mm, 1.8 mm, 1.82 mm, 1.84 mm, 1.86 mm, 1.88 mm, 1.9 mm, etc.

[0075] In this embodiment, the bottom portion 11 includes a connecting portion 111 and a boss portion 112. The connecting portion 111 is arranged around the outer periphery of the boss portion 112. The end of the connecting portion 111 facing away from the boss portion 112 is connected to the side portion 12. The boss portion 112 protrudes toward the accommodating cavity 13 relative to the connecting portion 111. Thus, when the paper plastic bottle cap 100 is applied to a bottle assembly, the boss portion can improve the sealing performance of the paper plastic bottle cap 100 against the bottle, better preventing leakage from the bottle assembly. If the distance D between the boss portion 112 and the threaded protrusion is too small, the threaded connection between the paper plastic bottle cap 100 and the bottle will be affected, making it impossible for the paper plastic bottle cap 100 to be tightened to the bottle mouth. If the distance D between the boss portion 112 and the threaded protrusion is too large, the sealing and leak-proof effect of the boss portion 112 will be reduced, thereby reducing the sealing performance of the paper plastic bottle cap 100.

[0076] See Figure 7 In some embodiments, the height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 is in the range of 3.4 mm ≤ h2 ≤ 3.6 mm.

[0077] Specifically, the height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 can be, but is not limited to, 3.4mm, 3.42mm, 3.44mm, 3.46mm, 3.48mm, 3.5mm, 3.52mm, 3.54mm, 3.56mm, 3.58mm, 3.6mm, etc.

[0078] In this embodiment, if the height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 is too small, the sealing effect of the boss sub-portion 112 is reduced; if the height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 is too large, when the paper plastic bottle cap 100 is installed on the bottle body, the boss sub-portion 112 of the paper plastic bottle cap 100 is likely to interfere with the bottle mouth of the bottle body, thereby affecting the installation of the paper plastic bottle cap 100.

[0079] Optionally, a distance s2 between the main body portion 21 and the boss sub-portion 112 is in the range of 3.0 mm ≤ s2 ≤ 3.2 mm.

[0080] Specifically, the spacing s2 between the main body portion 21 and the boss sub-portion 112 can be, but is not limited to, 3.0 mm, 3.02 mm, 3.04 mm, 3.06 mm, 3.08 mm, 3.1 mm, 3.12 mm, 3.14 mm, 3.16 mm, 3.18 mm, 3.2 mm, etc.

[0081] In this embodiment, the distance s2 between the main body 21 and the boss sub-part 112 is too small. When the paper plastic bottle cap 100 is installed on the bottle body, the boss sub-part 112 is likely to interfere with the bottle mouth of the bottle body, affecting the installation of the paper plastic bottle cap 100; if the distance s2 between the main body 21 and the boss sub-part 112 is too large, the sealing and leak-proof effect of the boss sub-part 112 on the bottle body is reduced.

[0082] Optionally, a ratio h2 / h between a height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 and a height h of the paper-plastic bottle cap 100 is in a range of 0.4≤h2 / h≤0.5.

[0083] Specifically, the ratio of the height h2 of the boss sub-part 112 protruding from the connecting sub-part 111 to the height h of the paper-plastic bottle cap 100 can be, but is not limited to, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, etc.

[0084] In this embodiment, if the ratio of the height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 to the height h of the paper plastic bottle cap 100 is too small, the sealing and leak-proof effect of the boss sub-portion 112 on the bottle body is reduced when the paper plastic bottle cap 100 is installed on the bottle body; if the ratio of the height h2 of the boss sub-portion 112 protruding from the connecting sub-portion 111 to the height h of the paper plastic bottle cap 100 is too large, the boss sub-portion 112 is likely to interfere with the bottle mouth of the bottle body when the paper plastic bottle cap 100 is installed on the bottle body, thereby affecting the installation of the paper plastic bottle cap 100.

[0085] See Figure 6 In some embodiments, the paper-plastic thread layer 20 includes a first threaded member 23 and a second threaded member 24, and the first threaded member 23 and the second threaded member 24 are adjacent to each other and are arranged around the surface of the side portion 12 facing the accommodating cavity 13; the first threaded member 23 includes a first main body sub-portion 231 and a first spiral protrusion sub-portion 232, and the first spiral protrusion sub-portion 232 protrudes away from the side portion 12 compared to the first main body sub-portion 231, and the second threaded member 24 includes a second main body sub-portion 241 and a second spiral protrusion sub-portion 242, and the second spiral protrusion sub-portion 242 protrudes away from the side portion 12 compared to the second main body sub-portion 241, wherein the main body 21 includes the first main body sub-portion 231 and the second main body sub-portion 241, and the spiral protrusion 22 includes the first spiral protrusion sub-portion 232 and the second spiral protrusion sub-portion 242.

[0086] It can be understood that the first threaded member 23 and the second threaded member 24 are integrally formed by pulp molding process, and then adhered to the side portion 12 of the paper-plastic cover 10 through the adhesive layer 30 .

[0087] Optionally, the first threaded member 23 is in a semicircular arc shape, and the second threaded member 24 is in a semicircular arc shape.

[0088] The inventors of this application have discovered through experiments that, compared with the solution of splicing the paper-plastic thread layer 20 with three threaded parts, the use of two threaded parts for splicing in this embodiment can better reduce the difficulty of splicing, making it easier to align the first threaded part 23 and the second threaded part 24. When the first threaded part 23 and the second threaded part 24 are assembled on the paper-plastic cover body 10, the paper-plastic bottle cap 100 has a better appearance.

[0089] In some embodiments, the thickness of the paper-plastic cover 10 ranges from 0.8 mm to 1 mm.

[0090] It is understandable that the thickness of the paper-plastic cover 10 is uniform. In other words, the thickness of the connecting sub-section 111, the boss sub-section 112, and the side section 12 is uniform. The connecting sub-section 111, the boss sub-section 112, and the side section 12 are integrally formed using a paper pulp molding process. That is, the connecting sub-section 111, the boss sub-section 112, and the side section 12 form a one-piece structure.

[0091] Specifically, the thickness of the paper-plastic cover 10 can be, but is not limited to, 0.8 mm, 0.82 mm, 0.84 mm, 0.86 mm, 0.88 mm, 0.9 mm, 0.91 mm, 0.92 mm, 0.94 mm, 0.96 mm, 0.98 mm, 1 mm, etc.

[0092] In this embodiment, if the thickness of the paper-plastic cover 10 is too thin, the mechanical strength of the paper-plastic cover 10 is reduced; if the thickness of the paper-plastic cover 10 is too thick, the production cost of the paper-plastic cover 10 is increased.

[0093] Optionally, the thickness of the paper-plastic thread layer 20 ranges from 0.6 mm to 0.8 mm.

[0094] It is understood that the thickness of the paper-molded thread layer 20 is uniform. Specifically, the thickness of the main body portion 21 and the spiral protrusion portion 22 is equal. In other words, the thickness of the first main body sub-portion 231 and the first spiral protrusion sub-portion 232 is equal, and the thickness of the second main body sub-portion 241 and the second spiral protrusion sub-portion 242 is equal. Both the first threaded member 23 and the second threaded member 24 are integrally formed using a paper pulp molding process.

[0095] Specifically, the thickness of the paper-plastic thread layer 20 can be, but is not limited to, 0.6 mm, 0.62 mm, 0.64 mm, 0.66 mm, 0.68 mm, 0.7 mm, 0.71 mm, 0.72 mm, 0.74 mm, 0.76 mm, 0.78 mm, 0.8 mm, etc.

[0096] In this embodiment, if the thickness of the paper plastic thread layer 20 is too thin, the mechanical strength of the spiral protrusion 22 is reduced. When the paper plastic bottle cap 100 is installed on the bottle body, the stability and reliability of the threaded connection between the paper plastic bottle cap 100 and the bottle body are affected; if the thickness of the paper plastic thread layer 20 is too thick, the line width of the spiral protrusion 22 is increased, which makes it easy for the paper plastic bottle cap 100 to be unable to tighten the bottle mouth of the bottle body, or even if it is screwed in, the stability and sealing of the connection between the paper plastic bottle cap 100 and the bottle body will be reduced.

[0097] See Figure 1 In some embodiments, the paper plastic cover 10 further includes a plurality of anti-slip portions 40, which are spaced apart around the outer periphery of the side portion 12. The plurality of anti-slip portions 40 provided on the outer periphery of the side portion 12 of the paper plastic cover 10 increase the friction with the paper plastic bottle cap 100 when the paper plastic bottle cap 100 is twisted, facilitating tightening or loosening of the paper plastic cover 10 and improving the user experience.

[0098] Optionally, the width of the anti-slip portion 40 along the circumferential direction of the side portion 12 ranges from 0.4 mm to 0.8 mm. Specifically, the width of the anti-slip portion 40 along the circumferential direction of the side portion 12 may be, but is not limited to, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, etc. If the width of the anti-slip portion 40 is too narrow, the anti-slip effect of the anti-slip portion 40 is reduced; if the width of the anti-slip portion 40 is too wide, the appearance of the paper-plastic bottle cap 100 is reduced.

[0099] Optionally, the spacing between two adjacent anti-slip portions 40 ranges from 0.95 mm to 1.35 mm. Specifically, the spacing between two adjacent anti-slip portions 40 can be, but is not limited to, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, etc. If the spacing between two adjacent anti-slip portions 40 is too narrow, the anti-slip effect of the anti-slip portions 40 is reduced; if the spacing between two adjacent anti-slip portions 40 is too wide, the appearance of the paper-plastic bottle cap 100 is reduced.

[0100] Optionally, the thickness of the anti-slip portion 40 ranges from 0.05mm to 0.4mm. It is understandable that the height of the anti-slip portion 40 in the radial direction of the paper plastic bottle cap 100 ranges from 0.05mm to 0.4mm. Specifically, the thickness of the anti-slip portion 40 can be, but is not limited to, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, etc. If the thickness of the anti-slip portion 40 is too thin, the anti-slip effect of the anti-slip portion 40 is reduced; if the thickness of the anti-slip portion 40 is too thick, the difficulty of preparing the anti-slip portion 40 is increased, and the appearance of the paper plastic bottle cap 100 is reduced.

[0101] Figure 8 It is a schematic diagram of the three-dimensional structure of the bottle assembly 200 according to an embodiment of the present application.

[0102] See Figure 8 The present embodiment further provides a bottle assembly 200, comprising a bottle body 210 and the paper-plastic bottle cap 100 of the present embodiment. The bottle body 210 is used to hold an object and includes a bottle mouth 211 having an external thread (not shown); the paper-plastic bottle cap 100 is threadedly connected to the bottle mouth 211.

[0103] The bottle assembly 200 of the present application can be used to contain liquid objects such as water, beverages, and milk. In addition, it can also be used to contain solid objects such as powders and particles.

[0104] It can be understood that the paper plastic bottle cap 100 is sleeved on the outer periphery of the bottle mouth 211, and the spiral protrusion 22 of the paper plastic thread layer 20 is threadedly connected to the external thread of the bottle mouth 211, thereby realizing the connection between the bottle body 210 and the paper plastic bottle cap 100, and then realizing the detachable connection between the bottle body 210 and the paper plastic bottle cap 100.

[0105] Optionally, the bottle body 210 may be, but is not limited to, at least one of a plastic bottle, a paper-plastic bottle, a glass bottle, a metal bottle, and the like.

[0106] For descriptions of other aspects of the paper-plastic bottle cap 100, please refer to the descriptions of the corresponding parts of the above embodiments, which will not be repeated here.

[0107] References to "embodiments" and "implementation methods" in this application mean that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrases in various locations in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should be understood that the features, structures or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of this application, unless there is a contradiction between them.

[0108] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the above preferred implementation modes, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A paper-plastic bottle cap, characterized in that: The paper-plastic bottle cap comprises: A paper-plastic cover, the paper-plastic cover comprising a bottom and side portions connected by bending, the side portions being arranged around the periphery of the bottom, the bottom and the side portions enclosing a receiving cavity; a paper-plastic thread layer, the paper-plastic thread layer being arranged around the inner side wall of the side portion, the paper-plastic thread layer comprising a main body portion and a spiral protrusion portion, the spiral protrusion portion protruding in a direction away from the side portion relative to the main body portion, and the spiral protrusion portion being spirally arranged around the side portion; and An adhesive layer is located between the side portion and the paper-plastic thread layer, and is used to adhere the paper-plastic thread layer to the surface of the side portion facing the accommodating cavity.

2. The paper-plastic bottle cap according to claim 1, characterized in that: A height h1 of the spiral protrusion compared to the main body is in the range of 1.3 mm ≤ h1 ≤ 1.5 mm.

3. The paper-plastic bottle cap according to claim 1, characterized in that: The line width s1 of the spiral protrusion is in the range of 3.4 mm ≤ s1 ≤ 3.7 mm.

4. The paper-plastic bottle cap according to claim 1, characterized in that: The lead angle α of the spiral protrusion is in the range of 6°≤α≤7°.

5. The paper-plastic bottle cap according to claim 1, characterized in that: The range of the tooth angle β of the spiral protrusion is 28°≤β≤35°.

6. The paper-plastic bottle cap according to claim 1, characterized in that: The bottom includes a connecting sub-portion and a boss sub-portion, the connecting sub-portion is arranged around the outer periphery of the boss sub-portion, the end of the connecting sub-portion facing away from the boss sub-portion is connected to the side portion, and the boss sub-portion protrudes toward the accommodating cavity compared to the connecting sub-portion; along the arrangement direction of the boss sub-portion, the connecting sub-portion and the side portion, the distance D between the boss sub-portion and the threaded protrusion is in the range of 1.7mm≤D≤1.9mm.

7. The paper-plastic bottle cap according to claim 6, characterized in that: The height h2 of the boss sub-part protruding from the connecting sub-part is in the range of 3.4 mm ≤ h2 ≤ 3.6 mm; and / or, The range of the distance s2 between the main body portion and the boss portion is 3.0 mm ≤ s2 ≤ 3.2 mm; and / or, The ratio h2 / h between the height h2 of the boss sub-part protruding from the connecting sub-part and the height h of the paper-plastic bottle cap is in the range of 0.4≤h2 / h≤0.

5.

8. The paper-plastic bottle cap according to claim 1, characterized in that: The paper-plastic thread layer includes a first threaded member and a second threaded member, and the first threaded member and the second threaded member are adjacent to each other and are arranged around the surface of the side facing the accommodating cavity; the first threaded member includes a first main body sub-portion and a first spiral protrusion sub-portion, and the first spiral protrusion sub-portion protrudes in a direction away from the side compared to the first main body sub-portion; the second threaded member includes a second main body sub-portion and a second spiral protrusion sub-portion, and the second spiral protrusion sub-portion protrudes in a direction away from the side compared to the second main body sub-portion, wherein the main body includes the first main body sub-portion and the second main body sub-portion, and the spiral protrusion includes the first spiral protrusion sub-portion and the second spiral protrusion sub-portion.

9. The paper-plastic bottle cap according to claim 1, characterized in that: The thickness of the paper-plastic cover body ranges from 0.8mm to 1mm; the thickness of the paper-plastic thread layer ranges from 0.6mm to 0.8mm; The paper-plastic cover also includes a plurality of anti-slip parts, which are arranged at intervals around the outer circumference of the side part. Along the circumferential direction of the side part, the width of the anti-slip part ranges from 0.4mm to 0.8mm; the spacing between two adjacent anti-slip parts ranges from 0.95mm to 1.35mm; and the thickness of the anti-slip part ranges from 0.05mm to 0.4mm.

10. A bottle assembly, characterized in that: The bottle assembly comprises: a bottle body, for containing a target object, the bottle body comprising a bottle mouth, the bottle mouth having an external thread; and The paper-plastic bottle cap according to any one of claims 1 to 9, wherein the paper-plastic bottle cap is threadedly connected to the bottle mouth.

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