Cap assembly and packaging container and method of manufacturing a packaging container

Abstract

This disclosure provides a cap assembly, a packaging container including the cap assembly, and a method of manufacturing the packaging container. The cap assembly includes a flow guide and a cap. The flow guide includes a tube and a platform connected to and surrounding the tube. The cap releasably covers the tube and seals its covered end. At least the platform of the flow guide is made of a composite material, including high-density polyethylene and materials selected from low-density polyethylene, linear low-density polyethylene, and mixtures thereof, wherein the density of the composite material is in the range of 930–950 kg / m³. 3 Within the scope of this invention, by using a composite material comprising high-density polyethylene as well as low-density polyethylene and / or linear low-density polyethylene to form at least the platform portion of the cap assembly, the strength and toughness of the cap assembly are improved, enabling the cap assembly to be securely and firmly installed onto the packaging container body by ultrasonic welding, thereby effectively sealing the packaging container and preventing accidental damage to the cap assembly during the ultrasonic welding process.

Description

Technical Field

[0001] This disclosure relates to the field of packaging, and more particularly to a lid assembly, a packaging container, and a method for manufacturing the packaging container. Background Technology

[0002] Large-capacity packaging containers used for encapsulating flowable materials are typically fitted with reusable lids to facilitate repeated opening and closing, thereby sealing the contents of the container between openings. For example, when the contents are liquid materials such as milk, juice, or yogurt, or solid flowable materials such as milk powder or solid beverages, the packaging container may include a flow guide that facilitates the flow of the flowable material and a lid that mates with the flow guide. Such lids can be attached to the container body in various ways, such as by adhesive or welding to the inner or outer surfaces of the container. Summary of the Invention

[0003] This disclosure provides a cover assembly, including: a flow guide member and a cover, wherein the flow guide member includes a tube portion and a platform portion connected to and surrounding the tube portion; and the cover releasably covers the tube portion and seals the covered end of the tube portion; wherein at least the platform portion of the flow guide member is made of a composite material, the composite material including high-density polyethylene and materials selected from low-density polyethylene, linear low-density polyethylene and mixtures thereof, wherein the density of the composite material is 930–950 kg / m³. 3 Within the range.

[0004] In at least some embodiments, the amount of high-density polyethylene is from 40 wt% to 99 wt% based on the total weight of the composite material, and the amount of material selected from low-density polyethylene, linear low-density polyethylene and mixtures thereof is from 1 wt% to 60 wt%.

[0005] In at least some embodiments, the material selected from low-density polyethylene, linear low-density polyethylene, and mixtures thereof is linear low-density polyethylene.

[0006] In at least some embodiments, the surface of the platform facing the cover is an upper surface, and a protrusion is provided on the upper surface. The protrusion is located between the outer periphery of the tube and the outer periphery of the platform and is spaced apart from both the outer periphery of the tube and the outer periphery of the platform.

[0007] In at least some embodiments, the protrusion is a substantially uniform convex ring surrounding the tube portion, the shortest distance between the outer periphery of the cover and the outer periphery of the platform portion is D, the shortest distance between the outermost outer periphery of the convex ring and the outer periphery of the platform portion is d1, and the maximum height of the convex ring is h, wherein h is in the range of 10% D to 30% D, and d1 is in the range of 1.0h to 2.0h.

[0008] In at least some embodiments, the shortest distance between the innermost circumference of the convex ring and the outer circumference of the cover is d2, wherein d2 is in the range of 1 / 3D to 4 / 5D.

[0009] In at least some embodiments, the minimum distance between the highest point of the convex ring in a direction perpendicular to the upper surface of the platform and the outer periphery of the convex ring is less than the minimum distance between the highest point and the inner periphery of the convex ring.

[0010] In at least some embodiments, the protrusion is at least two substantially uniform convex rings that are substantially parallel to each other around the tube, wherein the maximum height of each convex ring is in the range of 10% D to 30% D, and the minimum distance between the highest points of two adjacent convex rings in the radial direction is 0.5 times the sum of the heights of the two adjacent convex rings.

[0011] In at least some embodiments, the outer periphery of the tube, the outer periphery of the platform, and the orthographic projection of the convex ring onto the platform are concentric circles.

[0012] In at least some embodiments, the cover assembly further includes a sealing sheet for sealing the tube portion, wherein the flow guiding member and the sealing sheet are integrally formed and made of the composite material.

[0013] In at least some embodiments, the cover assembly further includes a self-opening component, wherein the cover is a rotating cover, the self-opening component is disposed within the tube or on the cover, and is configured to rotate as the cover rotates to cut the sealing strip.

[0014] In at least some embodiments, at least one of the flow guide and the cover further includes a slip agent.

[0015] In at least some embodiments, the amount of the lubricant in the flow guide component is in the range of 0.01 wt% to 2.5 wt% based on the total weight of the flow guide component, and / or, the amount of the lubricant in the cap is in the range of 0.01 wt% to 2.5 wt% based on the total weight of the cap.

[0016] This disclosure also provides a packaging container including a lid assembly according to at least one embodiment of this disclosure.

[0017] This disclosure also provides a method for manufacturing a packaging container, comprising: providing a cap assembly, the cap assembly including a flow guiding component and a cap, the flow guiding component including a tube and a platform connected to and surrounding the tube, the cap releasably covering the tube and sealing the covered end of the tube, wherein at least the platform of the flow guiding component is made of a composite material, the composite material including high-density polyethylene and materials selected from low-density polyethylene, linear low-density polyethylene and mixtures thereof, wherein the density of the composite material is in the range of 930–950 kg / m³. 3 Within the scope of the invention, the invention provides a packaging container body; forms a pre-opening on the packaging container body such that the shape and size of the pre-opening matches the outer wall of the lid of the lid assembly; extends the lid of the lid assembly from the inside out through the pre-opening; and connects the lid assembly to the packaging container body by ultrasonically welding the surface of the platform facing the lid to the packaging container body, thereby producing the packaging container. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0019] Figure 1 This is a schematic diagram of the structure of a cover assembly provided in an embodiment of the present disclosure;

[0020] Figure 2A This is a schematic diagram of the structure of a cover assembly provided in another embodiment of the present disclosure;

[0021] Figure 2B for Figure 2A A schematic diagram of the formal structure of the flow guiding component of the cover assembly shown;

[0022] Figure 2C for Figure 2A A top view of the flow guiding component of the cover assembly shown;

[0023] Figure 3 The image shows a photograph of the overflow phenomenon during ultrasonic welding.

[0024] Figure 4A This is a schematic diagram of the structure of a cover assembly provided in yet another embodiment of the present disclosure;

[0025] Figure 4B for Figure 4A An exploded view of the cover assembly is shown below;

[0026] Figure 4C for Figure 4A A schematic cross-sectional view of the cover assembly shown;

[0027] Figure 5 This is a schematic diagram of a packaging container provided according to an embodiment of the present disclosure. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0029] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” indicate that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” “right,” or similar terms are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0030] Large-capacity packaging containers used for encapsulating flowable materials are typically equipped with reusable lids to facilitate repeated opening and closing, thereby sealing the contents between openings. For example, when the contents are liquids such as milk, juice, or yogurt, or solid flowable materials such as milk powder or solid beverages, the container may have a flow guide that allows the flowable material to easily flow out, and a lid that mates with the flow guide, so that the container can be resealed after a portion of the flowable material has been poured out. Such lids can be attached to the container body in various ways, such as by gluing or welding to the inner or outer surfaces of the container.

[0031] Currently, packaging containers for juice, milk, or other types of non-alcoholic beverages can include composite cardboard packaging containers, which may include lids installed in various ways, such as by adhesive bonding or ultrasonic welding. Conventional packaging container lids typically include single-seal lids and double-seal lids with a secondary sealing mechanism. Examples of such secondary sealing mechanisms include sealing strips with a pull ring that requires manual opening and sealing strips that can be cut by a pre-set opening mechanism within the lid.

[0032] Generally, the inner layer of commonly used composite cardboard packaging containers is often made of low-density polyethylene (LDPE), while the lid is typically made of either high-density polyethylene (HDPE) or LPE. When using HDPE for the lid, the difference in melting point and crystallinity between the HDPE used for the lid and the LPE used for the inner layer often makes ultrasonic welding difficult. Furthermore, lids made of HDPE may crack or even shatter during welding due to ultrasonic vibration. When using LPE for the lid, the resulting lid has lower hardness and higher ductility. Therefore, in double-sealed lids with a secondary sealing mechanism including a sealing strip and a self-opening mechanism, the LPE material is too soft to be easily cut.

[0033] To address the above and other issues, the inventors have noted that a suitable amount of low-density polyethylene and / or linear low-density polyethylene can be added to high-density polyethylene as a composite material for forming at least a portion of the lid. The addition of a certain amount of low-density polyethylene and / or linear low-density polyethylene to this composite material improves the compatibility and bonding ability between the lid and the innermost layer of low-density polyethylene in the packaging container during ultrasonic welding; improves the structural stability of the lid during ultrasonic welding, making it less prone to cracking or breakage; improves the cutting performance of the sealing strip in the secondary sealing mechanism of the lid; and ensures that the sealing strip remains connected to the lid assembly after being cut, preventing it from falling into the packaging container and contaminating the contents.

[0034] This disclosure provides a lid assembly, a packaging container, and a method for manufacturing the packaging container. The lid assembly is formed by using a composite material comprising high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene to form at least a platform portion. This improves the compatibility and bonding ability between the lid assembly and the innermost layer of the packaging container, allowing the lid assembly to be safely and securely installed onto the packaging container body via ultrasonic welding. This effectively seals the packaging container and prevents accidental damage to the lid assembly during the ultrasonic welding process.

[0035] The cover assembly provided in this disclosure includes: a flow guide member and a cover, wherein the flow guide member includes a tube and a platform connected to and surrounding the tube; the cover releasably covers the tube and seals the covered end of the tube, wherein at least the platform of the flow guide member is made of a composite material, said composite material including high-density polyethylene and materials selected from low-density polyethylene, linear low-density polyethylene and mixtures thereof, wherein the density of the composite material is 930–950 kg / m³. 3 Within the range.

[0036] The present disclosure will now be described through specific embodiments. To keep the following description of the embodiments of the present disclosure clear and concise, detailed descriptions of known functions and components may be omitted. When any component of an embodiment of the present disclosure appears in more than one drawing, the component may be represented by the same reference numerals in each drawing.

[0037] Figure 1 A schematic diagram of the structure of the cover assembly 1 provided in an embodiment of this disclosure is shown. Figure 1 As shown, the cover assembly 1 includes a cover 11 and a flow guide 100, wherein the flow guide 100 includes a tube 12 and a platform 13 connected to and surrounding the tube 12. The flow guide 100 is entirely made of a composite material, including high-density polyethylene and materials selected from low-density polyethylene, linear low-density polyethylene, and mixtures thereof, wherein the density of the composite material is between 930 and 950 kg / m³. 3 Within the range.

[0038] As is well known, polyethylene (PE) is a polymer material formed by the polymerization of ethylene monomers. It is one of the most commonly used synthetic resins in the world, widely used in industry, agriculture, medicine, hygiene, food, and daily necessities. PE mainly includes high-density polyethylene, low-density polyethylene, and linear low-density polyethylene. All types of polyethylene materials are non-toxic, tasteless, and odorless, possessing excellent insulation, moisture-proof, and impermeable properties, and are widely used in various industries.

[0039] As used herein, the term "high-density polyethylene (HDPE)" refers to the product of polymerization of ethylene monomers under low-pressure conditions catalyzed by a Ziegler catalyst; it is also known as low-pressure polyethylene, with a density of 941-965 kg / m³. 3 Within this range, high-density polyethylene has a high degree of crystallinity (65-85%) and a softening point (125-135℃), as well as good mechanical properties such as high strength, high toughness, and high rigidity. It also has good non-hygroscopicity, water vapor resistance, chemical resistance, and weather resistance.

[0040] As used herein, the term "low-density polyethylene (LDPE)" refers to a thermoplastic product synthesized by free radical polymerization of ethylene monomers under high pressure using oxygen or organic peroxides as catalysts. It is also known as high-pressure polyethylene, with a density of 910-940 kg / m³. 3 Within a certain range. Low-density polyethylene (LDPE) is chemically inert, has good sealing properties, and is easy to mold and process, making it one of the most widely used materials in the polymer industry today, especially in food packaging. Unlike other polyethylene materials such as high-density polyethylene (HDPE) and linear LPE, LPE produced by high-pressure methods has a branched structure and long branches, which also endows conventional LPE with flexibility and easy extrusion properties.

[0041] As used herein, the term "linear low-density polyethylene (LLDPE)" refers to a copolymer of ethylene and a small amount of higher α-olefins (such as butene-1, hexene-1, octene-1, tetramethylpentene-1, etc.) polymerized under the action of a catalyst at relatively low temperature and pressure. This copolymer has very short comonomer branches on the linear ethylene backbone and is non-toxic, tasteless, and odorless, with a density of 915-935 kg / m³. 3 Between. The linear low-density polyethylene formed by copolymerization has a narrower molecular weight distribution than ordinary low-density polyethylene. At the same time, its linear structure gives it different rheological properties and enhanced tensile strength, puncture resistance, impact resistance, and environmental stress cracking resistance.

[0042] Given that high-density polyethylene, low-density polyethylene, and linear low-density polyethylene each have their own advantages and disadvantages, the inventors, through in-depth research and extensive efforts, have developed a composite material with good overall performance for forming at least a portion of a lid by adding a certain amount of low-density polyethylene and / or linear low-density polyethylene to high-density polyethylene. In some examples, based on the total weight of the composite material, the amount of high-density polyethylene can be between 40 wt% and 99 wt%, for example, between any range of combinations of the endpoints from 40 wt%, 45 wt%, 50 wt%, 55 wt%, 65 wt%, 70 wt%, 75 wt% to 80 wt%, 85 wt%, 90 wt%, 95 wt%, 97 wt%, 98 wt%, or 99 wt% or more; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1 wt% and 60 wt%, for example, between any range of combinations of the endpoints from 1 wt%, 2 wt%, 3 wt%, 5 wt%, 10 wt%, 15 wt%, 20 wt% to 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt% or more. In a further example, low-density polyethylene and / or linear low-density polyethylene can be entirely linear low-density polyethylene or entirely low-density polyethylene, or low-density polyethylene and / or linear low-density polyethylene can be any mixture of the two. Composite materials containing mixtures of high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene within the above content range have good overall properties. For example, the addition of low-density polyethylene and / or linear low-density polyethylene allows for better bonding between the cap formed from this composite material and the innermost low-density polyethylene layer of the packaging container, and prevents the cap formed from this composite material from cracking or breaking due to vibration during ultrasonic welding.

[0043] As used herein, the term "ultrasonic welding (UW)" refers to a welding method in which ultrasonic energy is transmitted to the welding area through an upper welding component (such as a welding head), and frictional heat is generated between the two surfaces to be welded under appropriate pressure, resulting in instantaneous fusion. The resulting weld strength can be comparable to that of the original component. By using suitable workpieces and a reasonable interface design, ultrasonic welding can achieve watertight and airtight bonding strength, eliminating the inconvenience of using auxiliary components and achieving efficient and clean welding. During ultrasonic welding, due to the injection of ultrasonic energy, non-fusion areas of the welded parts may crack or break; therefore, materials with suitable composition must be used to form the parts to be welded. In developing the cap assembly described in the embodiments of this disclosure, the inventors used blends / composite materials formed by compounding high-density polyethylene with low-density polyethylene and / or linear low-density polyethylene to form at least a portion of the cap assembly described in the embodiments of this disclosure. It was found that cap assemblies made from such blends / composite materials have good strength, toughness, and crack resistance, and can be safely and securely installed onto the packaging container body by ultrasonic welding to effectively seal the packaging container and avoid accidental damage to the cap assembly during the ultrasonic welding process. In the cap assemblies provided in the above embodiments, by using composite materials including high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene to form the cap assembly, the strength and toughness of the cap assembly are improved, enabling the cap assembly to be safely and securely installed onto the packaging container body by ultrasonic welding to effectively seal the packaging container and avoid accidental loss due to cracking or breakage of the cap assembly during the ultrasonic welding process.

[0044] exist Figure 1 In the illustrated cover assembly, the flow guide 100 is described as being formed entirely of a composite material including high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene. It is understood that in other embodiments of this disclosure, only the aforementioned composite material may be used to form the platform portion of the flow guide, while other suitable materials such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and / or polypropylene (PP) may be used to form the tubular portion of the flow guide, and the two may be combined to form the entire flow guide.

[0045] Figure 2A A schematic diagram of the structure of a cover assembly provided in another embodiment of this disclosure is shown; Figure 2B It shows Figure 2A A front view schematic diagram of the flow guiding component of the cover assembly shown; Figure 2C It shows Figure 2A The diagram shows a top view of the flow guide component of the cover assembly.

[0046] Figure 2A-2C The structure of the flow guiding component 100 shown is generally similar to Figure 1 The flow guide 100 shown further includes a raised ring 14 on the upper surface of the platform 13 (i.e., the surface facing the cover). As shown, the raised ring 14 is a substantially uniform annular flange that protrudes upward from the upper surface of the platform 13 and surrounds the tube portion 12. As used herein, the term "substantially uniform" means that any cross-section of the raised portion or flange has substantially the same shape and size. The annular flange is located between the outer periphery of the tube portion 12 and the outer periphery of the platform 13, and is spaced apart from both the outer periphery of the tube portion 12 and the outer periphery of the platform 13. The raised ring 14 is integrally formed with the tube portion 12 and the platform 13, and is made of a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, wherein the density of the composite material is in the range of 930–950 kg / m³. 3 Within a certain range. In some examples, based on the total weight of this composite material, the amount of high-density polyethylene can be between 40 wt% and 99 wt%, for example, within any range combining the endpoints of 40 wt%, 45 wt%, 50 wt%, 55 wt%, 65 wt%, 70 wt%, 75 wt% to 80 wt%, 85 wt%, 90 wt%, 95 wt%, 97 wt%, 98 wt%, or 99 wt% or above; the amount of low-density polyethylene and / or linear low-density polyethylene can be 1 wt%. Between 1 wt% and 60 wt%, for example, between any range of the endpoints from 1 wt%, 2 wt%, 3 wt%, 5 wt%, 10 wt%, 15 wt%, 20 wt% to 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt% or above, wherein the low-density polyethylene and / or linear low-density polyethylene may be all low-density polyethylene or all linear low-density polyethylene, or may be any mixture of the two.

[0047] Figure 2A-2CIn the illustrated embodiment, the shortest distance between the outer periphery of the cover 11 and the outer periphery of the platform 13 is D, the shortest distance between the outer periphery of the convex ring 14 and the outer periphery of the platform 13 is d1, and the maximum height of the convex ring 14 is h, wherein h is in the range of 10% to 30% of D, and d1 is in the range of 1.0h to 2.0h. Controlling the shortest distance between the outer periphery of the convex ring and the outer periphery of the platform, as well as the height of the convex ring, within these ranges effectively prevents overflow and incomplete welding during ultrasonic welding. As used herein, the term "overflow" refers to the phenomenon where, during ultrasonic welding, the molten material on the welding surface extends beyond the outer periphery of the platform of the cover. Small pieces of overflow protruding beyond the outer periphery of the platform of the cover may break off and fall into the packaging during ultrasonic welding due to vibration caused by ultrasonic energy or other reasons, thus contaminating the contents of the packaging; therefore, overflow must be avoided. As used herein, the term "insufficient weld" refers to a situation during ultrasonic welding where the material melted by the introduction of ultrasonic energy on the weld surface is insufficient to completely weld the upper surface of the platform to the inner surface of the packaging, resulting in a gap between the upper surface of the platform near its outer periphery and the inner surface of the packaging due to the lack of weld melt. Such gaps may not be effectively sterilized during subsequent packaging sterilization, leading to hygiene risks. This disclosure embodiment effectively prevents material overflow and insufficient weld by appropriately setting the distances between the inner and outer peripheries of the convex ring and the outer peripheries of the platform and the cover, as well as the height and shape of the convex ring. Furthermore, the shortest distance between the inner periphery of the convex ring 14 and the outer periphery of the cover is d2, where d2 is in the range of 1 / 3D to 4 / 5D. Controlling the shortest distance between the outer periphery of the convex ring and the inner periphery of the cover within this range effectively prevents poor sealing due to welding deviations during ultrasonic welding and potential leakage problems.

[0048] Figure 2A-2C In one embodiment, the cross-section of the convex ring 14 is triangular, with the base of the triangle located on the upper surface of the platform 13, and its vertex being the highest point of the convex ring 14 along a direction perpendicular to the platform 13. Figure 2A-2C As shown, the distance between the vertex of the triangle and the outer periphery of the convex ring 14 is less than the distance between the vertex of the triangle and the inner periphery of the convex ring 14; that is, the vertex of the triangle is biased towards the outer periphery of the convex ring. A convex ring with this triangular cross-section can effectively prevent incomplete welding and welding deviation problems during ultrasonic welding.

[0049] Figure 2A-2C In the embodiments described, a triangle with its cross-section offset outwards from the vertex of the convex ring 14 is used as an example. It is understood that in other embodiments, convex rings with other cross-sectional shapes may also be used, including but not limited to cross-sections of isosceles / equilateral triangles, rectangles, squares, semicircles, inverted boat shapes, etc.

[0050] Figure 2A-2C In this embodiment, a substantially uniform raised ring 14, spaced apart from both the outer periphery of the tube portion 12 and the outer periphery of the platform portion 13, is described as a raised portion. It is understood that in other embodiments, at least two substantially parallel, substantially uniform raised rings, spaced apart from each other and also spaced apart from both the outer periphery of the tube portion and the outer periphery of the platform portion, may also be formed as raised portions on the upper surface of the platform portion. For example, two, three, four, or more substantially parallel and spaced-apart raised rings may be formed on the upper surface of the platform portion. In a preferred aspect, two substantially parallel and spaced-apart raised rings may be formed on the upper surface of the platform portion.

[0051] Figure 2A-2C In the illustrated embodiment, the outer periphery of the tube 12, the convex ring 14, and the outer periphery of the platform 13 are described as concentric rings that are substantially parallel (i.e., their orthographic projections onto the platform 13 are concentric circles). However, it is understood that in other embodiments, one or more or all of the outer periphery of the tube, the convex ring, and the platform may have other shapes. For example, one or more or all of the outer periphery of the tube, the convex ring, and the platform may be regular or irregular shapes such as concentric or non-concentric ellipses, rectangles, rhombuses, squares, stars, or rounded rectangles. Alternatively, a plurality of discontinuous protrusions, bosses, and / or flanges may be formed on the upper surface of the platform around the outer periphery of the tube as raised portions. This disclosure does not limit this aspect.

[0052] Figure 2A-2C In the illustrated embodiment, the tube portion 12, the platform portion 13, and the convex ring 14 are integrally formed as an example. It is understood that in other embodiments, one or some or all of the tube portion, platform portion, and convex ring may be formed using the same or different materials, and assembled together by means such as welding, as long as the platform portion is formed of a composite material including high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene.

[0053] Figure 2A-2CIn the illustrated embodiment, by using a composite material comprising high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene to form at least the platform portion of the cap assembly, the strength and toughness of the cap assembly are improved. This allows the cap assembly to be securely and firmly installed onto the packaging container body via ultrasonic welding, effectively sealing the packaging container and preventing accidental damage caused by cracking or breakage of the cap assembly during ultrasonic welding. During ultrasonic welding, by providing a raised portion on the platform, the ultrasonic energy transmitted during ultrasonic welding is more easily concentrated on the upper edge or upper surface of the raised portion, allowing the cap assembly to be better bonded to the packaging container body via ultrasonic welding, avoiding leakage problems caused by poor welding in individual areas. The shape and structural parameters of the raised portion are designed to avoid potential problems such as overflow and insufficient welding, as well as poor sealing problems caused by welding deviations.

[0054] Figures 4A-4C A schematic diagram of the structure of a cover assembly provided in yet another embodiment of this disclosure is shown, wherein, Figure 4A A cross-sectional schematic diagram of the cover assembly 1 provided in yet another embodiment of the present disclosure is shown; Figure 4B for Figure 4A A schematic cross-sectional view of the flow guiding component 100 of the cover assembly shown; Figure 4C for Figure 4A The diagram shown is an exploded view of the cover assembly.

[0055] like Figures 4A-4C As shown, the cover assembly 1 includes a flow guiding component 100 and a rotating cover 11. The flow guiding component 100 includes a tube portion 12, a platform portion 13, a sealing plate 15, and a self-opening component 16. Figures 4A-4C As shown, the tube portion 12 extends along the z-direction (including the +z or -z direction) and includes a first port and a second port opposite to each other in the z-direction. A rotating cap 11 releasably covers the first port to seal it. A platform portion 13 is connected to the second port of the tube portion 12 and extends outward around it. Two substantially parallel, substantially uniform raised rings 14 and 14' are provided as raised portions on the upper surface of the platform portion 13 (i.e., the surface facing the cap 200). Both raised rings 14 and 14' are annular flanges that protrude upward from the upper surface of the platform portion 13. They are both located between the outer periphery of the tube portion 12 and the outer periphery of the platform portion 13, spaced apart from each other, and spaced apart from both the outer periphery of the tube portion 12 and the outer periphery of the platform portion 13. A sealing plate 15 is connected to the platform portion 13 and seals the second port of the tube portion 12. The tube 12, platform 13, convex rings 14 and 14', and sealing plate 15 are integrally molded and formed of a composite material comprising high-density polyethylene and materials selected from low-density polyethylene, linear low-density polyethylene, and mixtures thereof, wherein the density of the composite material is 930–950 kg / m³. 3Within the range. The self-opening component 16 is installed inside the tube 12 and is configured to rotate as the rotating cover 11 rotates to cut the sealing sheet 15.

[0056] Figures 4A-4C In the illustrated embodiment, based on the total weight of the composite material, the amount of high-density polyethylene contained in the composite material can be between 40 wt% and 99 wt%, for example, between any range from 40 wt%, 45 wt%, 50 wt%, 55 wt%, 65 wt%, 70 wt%, 75 wt% to 80 wt%, 85 wt%, 90 wt%, 95 wt%, 97 wt%, 98 wt%, or 99 wt% or more; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1 wt% and 60 wt%, for example, between any range from 1 wt%, 2 wt%, 3 wt%, 5 wt%, 10 wt%, 15 wt%, 20 wt% to 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt% or more. In a further example, low-density polyethylene and / or linear low-density polyethylene may be all linear low-density polyethylene or all low-density polyethylene, or low-density polyethylene and / or linear low-density polyethylene may be any mixture of the two.

[0057] Figures 4A-4C In the embodiment shown, the shapes of the convex rings 14 and 14' are similar to... Figure 2A-2C The embodiments shown are basically the same. Additionally, the shortest distance between the outer periphery of the cover 11 and the outer periphery of the platform 13 is D; the shortest distance between the outer periphery of the outer convex ring 14 and the outer periphery of the platform 13 is d1; the shortest distance between the inner periphery of the inner convex ring 14' and the outer periphery of the cover 12 is d2; the maximum heights of the convex rings 14 and 14' are h1 and h2, respectively, wherein each of h1 and h2 is in the range of 10% to 30% D; d1 is in the range of 1.0 to 2.0 times the larger of h1 and h2; d2 is in the range of 1 / 3D to 4 / 5D; and the distance between the highest points of the convex rings 14 and 14' in the radial direction is at least 0.5 times (h1 + h2). By ensuring that the shortest distance between the outermost circumference of the outermost convex ring and the outer circumference of the platform, the shortest distance between the innermost circumference of the innermost convex ring and the outer circumference of the cover, and the height of the convex ring are within the above range, it is possible to effectively prevent overflow and insufficient welding during ultrasonic welding, as well as poor sealing caused by welding deviation.

[0058] In some examples, the tube 12 includes an external connection structure, such as an external thread, located on its outer wall. The rotating cap 11 includes a connection structure, such as an internal thread, located on its inner wall, which is configured to mate with the external thread of the tube 12. Thus, when the first opening of the tube 12 is opened or sealed with the rotating cap 11, this can be achieved by the external thread of the tube 12 and the internal thread of the rotating cap 11 disengaging or engaging with each other, thereby improving the sealing of the packaging container and the convenience of use.

[0059] In other examples, the tube 12 may also include an internal connection structure, such as an internal thread, located on its inner wall. The self-opening member 16 includes an external thread located on its exterior, configured to engage with the internal thread of the tube 12, allowing the self-opening member 16 to rotate and move in a direction away from the sealing plate 15 (e.g., the +z direction shown in the figure) or towards the sealing plate 15 (e.g., the -z direction shown in the figure) as the rotating cover 11 rotates. For example, the self-opening member 16 is coaxially arranged with the tube 12 and configured to rotate and move downward in the -z direction when the wall portion of the rotating cover 11 rotates upward in the +z direction, thereby cutting open the sealing plate 15 located at the second opening of the tube 12.

[0060] In some other examples, the sealing strip 15 may have a weakened area in which the self-opening member 16 can pierce and cut the sealing strip 15. For example, the weakened area may be an imprint along at least a portion of the inner circumference of the second opening of the tube 12. In a preferred aspect, the weakened area may be configured such that the self-opening member 16 cannot completely cut the sealing strip 15 when the rotating cap 11 rotates, to prevent the cut sealing strip 15 from detaching from the cap assembly 1 and falling into the package contents, thereby contaminating the package contents.

[0061] Figures 4A-4C In the embodiment, the cross-sections of the convex rings 14 and 14' are both triangles with their bases located on the upper surface of the platform 13, and the vertices of these two triangles are the highest points of the convex rings 14 and 14' in a direction perpendicular to the platform 13. Figures 4A-4C As shown, the distance between the vertex of each triangle and the outer periphery of the corresponding convex ring is less than the distance between the vertex of the triangle and the inner periphery of the corresponding convex ring; that is, the vertex of each triangle is biased towards the outer periphery of the corresponding convex ring. Convex rings with this triangular cross-section can effectively prevent incomplete welding and welding deviations during ultrasonic welding.

[0062] Figures 4A-4C In the embodiments described, the cross-section of the convex rings 14 and 14' is used as an example of a triangle with its vertex pointing outwards. It is understood that in other embodiments, convex rings with other cross-sectional shapes may also be used, including but not limited to cross-sections of isosceles / equilateral triangles, rectangles, squares, semicircles, inverted boat shapes, etc.

[0063] Figures 4A-4C In the illustrated embodiment, cover 11 is described as a rotating cover. It will be understood that in other embodiments, the cover may be a cover with other structures such as snap-fit, as long as it is convenient to connect the cover to the component in a way that allows for repeated operation.

[0064] Figures 4A-4C In the illustrated embodiment, the sealing sheet 15 is described as being connected to the platform portion 13 and sealing the second opening of the tube portion 12. It is understood that in other embodiments, the sealing sheet may also be located inside the tube portion and connected to the inner wall of the tube portion to seal the tube portion. For example, the sealing sheet may also be located in the middle of the tube portion or near the first opening of the tube portion, as long as it can seal the tube portion.

[0065] Figures 4A-4C In the illustrated embodiment, the sealing sheet 15 is cut by a self-opening component 16 disposed within the tube 12 and capable of rotating and moving in the z-direction. It is understood that in other embodiments, self-opening components of other structures may be used, as long as they can cut or otherwise destroy the sealing sheet as the cover separates from the guide component; or, the self-opening component may be omitted, and the sealing sheet may be cut by an external accessory such as a knife, or the sealing sheet may be configured with a pull ring structure that can be manually pulled open.

[0066] Figures 4A-4C In the illustrated embodiment, the tube 12, platform 13, convex rings 14, 14' and sealing sheet 15 are integrally formed as an example. It is understood that in other embodiments, one or some or all of the tube, platform, convex ring and sealing sheet can be formed using the same or different materials and assembled together by means such as welding, as long as the platform portion is formed of a composite material including high-density polyethylene, low-density polyethylene and / or linear low-density polyethylene.

[0067] exist Figures 4A-4CIn the illustrated embodiment, by using a composite material comprising high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene to form at least the platform portion of the cap assembly, the strength and toughness of the cap assembly are improved. This allows the cap assembly to be securely and firmly installed onto the packaging container body via ultrasonic welding, effectively sealing the packaging container and preventing accidental damage due to cracking or breakage of the cap assembly during ultrasonic welding. During ultrasonic welding, the raised ring design on the platform makes it easier to concentrate the ultrasonic energy transmitted during ultrasonic welding onto the upper edge or upper surface of the raised ring, allowing the cap assembly to be better bonded to the packaging container body via ultrasonic welding, avoiding leakage problems caused by poor welding in individual parts. The two substantially parallel raised rings prevent potential overflow problems caused by excessive material in individual parts, thereby avoiding container contents contamination problems caused by overflow breakage. The shape and structural parameters of the raised rings are designed to avoid overflow or insufficient welding problems and poor sealing problems caused by welding deviations.

[0068] In some embodiments, one or more or all of the flow guide component, the cover, and possibly the sealing sheet and self-opening component of the cover assembly may be formed by injection molding.

[0069] In some embodiments, a slip agent may also be added to at least one of the flow guide component and the cap assembly. For example, based on the total weight of the flow guide component, the amount of slip agent added to the flow guide component may range from 0.01 to 2.5 wt%, for example, between 0.1 wt% and 2.4 wt%, 0.5 wt% and 2.3 wt%, 1.0 wt% and 2.0 wt%, etc.; and / or, based on the total weight of the cap, the amount of slip agent added to the cap may range from 0.01 to 2.5 wt%, for example, between 0.1 wt% and 2.4 wt%, 0.5 wt% and 2.3 wt%, 1.0 wt% and 2.0 wt%, etc. Generally, adding a slip agent to the flow guide component and / or the cap helps to reduce the cutting force of the component and increase the over-rotation torque, thereby making it easier for the user to cut the sealing strip when opening the cap and less likely to slip the cap. In some examples, a slip agent may be used in both the flow guide component and the cap. In other examples, a lubricant may be used only on the flow guide but not on the cap to prevent over-spinning problems.

[0070] This disclosure also provides a packaging container that includes any of the lid components described in this disclosure. Figure 5 A schematic diagram of a packaging container 1000 provided in an embodiment of this disclosure is shown. For example... Figure 5 As shown, the packaging container 1000 provided in this embodiment includes: a lid assembly 1 and a packaging container body (hereinafter referred to as "body") 2.

[0071] like Figure 5 As shown, for example, the main body 2 includes a top, a side, and a bottom. In the vertical direction (as shown in the z-direction), the side connects between the top and the bottom. The top is a roof-like structure with a pre-set opening through which the cover assembly 1 passes from the inside to the outside of the main body 2 and is connected to the main body 2.

[0072] To prevent the deterioration of packaging contents such as liquids, gels, or powders, the main body 2 can be formed by folding a composite sheet. For example, from the outer surface to the inner surface of the main body 2, the composite sheet may include, in sequence, a printable ink layer, an outer polymer layer, a support layer, a water- and oxygen-barrier layer, and an inner polymer layer.

[0073] This disclosure describes an embodiment with a roof-shaped top and a pre-set opening on the sloping surface of the roof-shaped portion connected to the cover assembly 1. It is understood that in other embodiments, the top may also be a flat roof shape with an end opening at the top plane of the flat roof-shaped portion connected to the cover assembly 1; or, the top may be a planar shape or other shapes. This disclosure does not limit this aspect.

[0074] In the packaging container provided in the above embodiments, by using a composite material including high-density polyethylene, low-density polyethylene and / or linear low-density polyethylene to form at least the platform portion of the cover assembly, the strength and toughness of the cover assembly are improved, so that the cover assembly can be safely and firmly installed onto the body of the packaging container by ultrasonic welding, so as to effectively seal the packaging container and avoid accidental damage caused by cracking or breaking of the cover assembly during ultrasonic welding.

[0075] This disclosure also provides a method for manufacturing a packaging container, comprising: providing a cap assembly, the cap assembly including a flow guiding component and a cap, the flow guiding component including a tube and a platform connected to and surrounding the tube, the cap releasably covering the tube and sealing the covered end of the tube, wherein at least the platform of the flow guiding component is made of a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, wherein the density of the composite material is 930–950 kg / m³. 3 Within the scope of the invention, the following steps are taken: providing a packaging container body; forming a pre-opening on the packaging container body such that the shape and size of the pre-opening matches the outer wall of the tube portion of the flow guide member of the cap assembly; extending the tube portion from the inside out through the pre-opening; and connecting the cap assembly to the packaging container body by ultrasonically welding the surface of the platform portion facing the cap to the packaging container body, thereby producing the packaging container.

[0076] In some examples, based on the total weight of the composite material, the amount of high-density polyethylene can be between 40 wt% and 99 wt%, for example, between any range of combinations of the endpoints from 40 wt%, 45 wt%, 50 wt%, 55 wt%, 65 wt%, 70 wt%, 75 wt% to 80 wt%, 85 wt%, 90 wt%, 95 wt%, 97 wt%, 98 wt%, or 99 wt% or more; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1 wt% and 60 wt%, for example, between any range of combinations of the endpoints from 1 wt%, 2 wt%, 3 wt%, 5 wt%, 10 wt%, 15 wt%, 20 wt% to 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt% or more. In a further example, low-density polyethylene and / or linear low-density polyethylene may be all linear low-density polyethylene or all low-density polyethylene, or low-density polyethylene and / or linear low-density polyethylene may be any mixture of the two.

[0077] In the packaging container manufacturing method provided in the above embodiments, by using a composite material including high-density polyethylene, low-density polyethylene and / or linear low-density polyethylene to form at least the platform portion of the cover assembly, the strength and toughness of the cover assembly are improved, so that the cover assembly can be safely and firmly installed onto the packaging container body by ultrasonic welding, so as to effectively seal the packaging container and avoid accidental damage caused by cracking or breaking of the cover assembly during ultrasonic welding; by passing the cover assembly through a pre-set opening of matching shape and size on the packaging container body from the inside to the outside, the cover assembly can be firmly locked onto the packaging container, effectively preventing the cover assembly from accidentally falling off the packaging container due to external force.

[0078] Example

[0079] The present invention will now be explained in further detail with reference to examples and comparative examples. However, those skilled in the art will understand that these examples and comparative examples are provided for illustrative purposes only and are not intended to limit the invention.

[0080] Preparation example:

[0081] Reference Figure 2A-2C , Figures 4A-4C Table 1 below describes the manufacture of a cover assembly and a comparative cover assembly, wherein the flow guide component (including the tube portion, platform portion, and any present raised ring and sealing plate) is integrally injection molded. Wherein, if the cover assembly includes a raised ring, the raised ring or plurality of raised rings satisfies the following conditions:

[0082] • The raised ring or multiple raised rings are basically uniform raised rings surrounding the tube section;

[0083] The shortest distance between the outer periphery of the cover and the outer periphery of the platform is D; the shortest distance between the outer periphery of the outermost convex ring and the outer periphery of the platform is d1; and the shortest distance between the inner periphery of the innermost convex ring and the inner periphery of the platform is d2.

[0084] • In the case of a single convex ring, the maximum height of the convex ring is h; in the case of two convex rings, along the direction from the outer periphery of the tube to the outer periphery of the platform, the maximum heights of the two convex rings are h1 and h2 respectively.

[0085] • Where h is in the range of 10% D to 30% D, or either h1 or h2 is within 10%.

[0086] D to 30% of D; d1 is within the range of 1.0h to 2.0h, or d1 is within h1, h2...h n The distance between the two convex rings is at least 0.5 times (h1+h2), ranging from 1.0 to 2.0 times the largest of the two convex rings. The distance between the two convex rings is at least 0.5 times (h1+h2).

[0087] Table 1. Manufacturing of the cover assembly

[0088]

[0089]

[0090] Note: 1) HDPE represents high-density polyethylene, LLDPE represents linear low-density polyethylene, and PP represents polypropylene.

[0091] 2) The weight percentages of HDPE and LLDPE are based on the total weight of the composite material;

[0092] 3) The weight percentage of the lubricant is based on the total weight of the guide component or cap.

[0093] Test case

[0094] 1. Welding performance test

[0095] The lid components 1-7, as described above, are ultrasonically welded onto the main body of the packaging container to form a... Figure 5 The packaging container shown was tested, and its performance was evaluated. The results are shown in Table 2 below. The push-out force refers to the force required to apply a push to the welded cap assembly to separate it from the main body of the packaging container.

[0096] Table 2. Test results of welding performance of the cover assembly according to the embodiments of this disclosure

[0097]

[0098]

[0099] Note: 1) Welding time must be <0.27s to meet the processing requirements of the production line;

[0100] 2) The push-out force must be >100N; otherwise, it is considered a poor weld.

[0101] 3) It must be completely fused with the fiber layer inside the main body of the packaging container; otherwise, it is considered a poor weld.

[0102] As can be seen from the above test results, when the ultrasonic welding energy and amplitude are low, the platform of the cover assemblies 6 and 7, whose flow guiding components are entirely made of HDPE, cannot be completely fused with the fiber layer inside the packaging container body. At higher ultrasonic welding energy and amplitude, overflow occurs, and the welding time for these cover assemblies is also too long, making it difficult to find a suitable working window. In contrast, the platform of the cover assembly described in this disclosure, where the flow guiding component is made of a composite material including HDPE, LDPE, and / or LLDPE, can be well fused with the packaging container body, forming a strong welded bond. When one or two convex rings are added, the platform can achieve good fusion and a strong bond with a shorter welding time at lower ultrasonic welding energy and amplitude, without overflow, thus providing a more flexible working window for installing the cover assembly to the packaging container body via ultrasonic welding.

[0103] 2. Torque performance test

[0104] As described in the preparation example, 60 cap components 3 and 8 were made and stored at room temperature for 3 days. Then, each type of cap component was divided into three groups (20 units per group), and each group was placed at room temperature, 3°C and 35°C for at least 24 hours, respectively.

[0105] The cap assembly was secured and locked onto the torque meter (Mecmesin Tornado) using a clamp. Then, the cap assembly was gripped with a cap gripper and rotated, and the torque was recorded. The results are shown in Table 3 below.

[0106] Table 2. Torque performance test results of the cover assembly according to the embodiments of this disclosure

[0107]

[0108] The test results above show that adding a lubricant to the flow guide component and / or cap can effectively reduce the puncture torque and increase the over-rotation torque, making the resulting cap assembly easier to cut the sealing sheet and less prone to slippage. Compared to cap assembly 3, which only adds a lubricant to the flow guide component but not the cap, cap assembly 8, which adds a lubricant to both the flow guide component and the cap, has a lower puncture torque but also a lower over-rotation torque. Therefore, cap assembly 8 can cut the sealing sheet more easily, but there is a certain possibility of over-rotation problems.

[0109] As can be seen from the above embodiments, in the cap assembly, packaging container, and manufacturing method of the packaging container provided in the above-described embodiments of this disclosure, by using a composite material including high-density polyethylene, low-density polyethylene, and / or linear low-density polyethylene to form at least the platform portion of the cap assembly, the strength and toughness of the cap assembly are improved. This allows the cap assembly to be safely and firmly installed onto the packaging container body via ultrasonic welding, effectively sealing the packaging container and avoiding accidental loss due to cracking or breakage of the cap assembly during ultrasonic welding. During ultrasonic welding, the raised ring design on the platform makes it easier for the ultrasonic energy transmitted during ultrasonic welding to be concentrated on the upper edge or upper surface of the raised ring, allowing the cap assembly to be better bonded to the packaging container body via ultrasonic welding, avoiding leakage problems caused by poor welding in individual parts. The two substantially parallel raised rings avoid potential overflow problems caused by excessive material in individual parts, thereby avoiding container contents contamination problems caused by overflow breakage. By passing the cap assembly through a pre-set opening of matching shape and size on the packaging container body from the inside out, the cap assembly can be firmly secured to the packaging container, effectively preventing the cap assembly from accidentally falling off the packaging container due to external force.

[0110] The following points should be noted in this article:

[0111] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0112] (2) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0113] (3) The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure. The scope of protection of this disclosure is determined by the appended claims.

[0114] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A cover assembly, comprising: The flow guide and the cover, wherein, The flow guiding component includes a tube and a platform connected to and surrounding the tube; and the cap releasably covers the tube and seals the covered end of the tube; the cap assembly also includes a sealing plate for sealing the tube; The flow guiding component is integrally formed with the sealing sheet and is made of a composite material, wherein the composite material includes high-density polyethylene and linear low-density polyethylene, and the density of the composite material is 930-950 kg / m³. 3 Within the range, based on the total weight of the composite material, the amount of high-density polyethylene is 50 wt% to 80 wt%, the amount of linear low-density polyethylene is 20 wt% to 50 wt%, and wherein the sealing sheet is provided with a weakening zone; The surface of the platform facing the cover is the upper surface, which is used to connect the cover assembly to the packaging container body by ultrasonic welding. A protruding portion is provided on the upper surface, located between the outer periphery of the tube and the outer periphery of the platform, and spaced apart from both the outer peripheries of the tube and the platform. The protruding portion is a substantially uniform convex ring surrounding the tube. The shortest distance between the outer periphery of the cover and the outer periphery of the platform is D. The shortest distance between the outermost outer periphery of the convex ring and the outer periphery of the platform is d1. The maximum height of the convex ring is h, where h is in the range of 10% to 30% of D, and d1 is in the range of 1.0 h to 2.0 h. The shortest distance between the innermost circumference of the convex ring and the outer circumference of the cover is d2, where d2 is in the range of 1 / 3 D to 4 / 5 D. Wherein, the minimum distance between the highest point of the convex ring along the direction perpendicular to the upper surface of the platform and the outer periphery of the convex ring is less than the minimum distance between the highest point and the inner periphery of the convex ring.

2. The cover assembly according to claim 1, wherein, The protruding portion consists of at least two substantially uniform convex rings that are substantially parallel to each other around the tube portion, wherein... The maximum height of each of the aforementioned convex rings is in the range of 10% D to 30% D. The minimum distance between the highest points of two adjacent convex rings in the radial direction is 0.5 times the sum of the heights of the two adjacent convex rings.

3. The cover assembly according to claim 1 or 2, wherein, The outer periphery of the tube, the outer periphery of the platform, and the projection of the convex ring onto the platform are concentric circles.

4. The cover assembly according to claim 3, further comprising: Self-opening components, among which... The cover is a rotating cover. The self-opening component is disposed inside the tube or on the cover, and is configured to rotate as the cover rotates to cut the sealing sheet.

5. The cover assembly according to claim 1, wherein, At least one of the flow guide component and the cover also includes a lubricant.

6. The cover assembly according to claim 5, wherein, Based on the total weight of the flow guiding component, the amount of the lubricant in the flow guiding component is in the range of 0.01 wt% to 2.5 wt%, and / or, Based on the total weight of the cover, the amount of the lubricant in the cover is in the range of 0.01 wt% to 2.5 wt%.

7. A packaging container comprising a lid assembly according to any one of claims 1 to 6.

8. A method for manufacturing a packaging container, comprising: Provide a cover assembly as described in any one of claims 1 to 7; Provide the main body of the packaging container; A pre-opening is formed on the main body of the packaging container, such that the shape and size of the pre-opening match the outer wall of the lid of the lid assembly; The cover of the cover assembly is pushed out from the pre-opening from the inside out; and The packaging container is manufactured by ultrasonically welding the surface of the platform facing the lid to the packaging container body, thereby connecting the lid assembly to the packaging container body.

Images