Lid assembly, packaging container and manufacturing method of packaging container

Abstract

The present disclosure provides a lid assembly, a packaging container including the lid assembly, and a method of manufacturing the packaging container. The cover assembly comprises a flow guide part and a cover. The flow guide part comprises a pipe part and a table part connected to and surrounding the pipe part. The cover is covered on the tube part in a releasable manner and seals the covered end of the tube part; wherein at least the table portion of the diversion member is made of a composite material comprising a high density polyethylene and a material selected from the group consisting of low density polyethylene, linear low density polyethylene and mixtures thereof, and wherein the density of the composite material is in the range of 930-950 kg / m3. According to the present invention, at least the land portion of the cover assembly is formed using a composite material comprising high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, such that the strength and the toughness of the cover assembly are improved, and the cover assembly can be safely and firmly mounted to the packaging container body by ultrasonic welding, thereby effectively sealing the packaging container, and improving the reliability of the packaging container. And the cover assembly is prevented from being accidentally damaged in the ultrasonic welding process.

Description

Technical Field

[0001] The present disclosure relates to the field of packaging, and in particular to a cap assembly, a packaging container, and a method for manufacturing the packaging container. Background Art

[0002] Large-capacity packaging containers for packaging flowable materials are usually equipped with reusable lids to facilitate repeated opening and closing, thereby sealing the contents of the packaging container between multiple openings. For example, when the contents are liquid materials such as milk, juice, yogurt, etc., or solid flowable materials such as milk powder, solid beverages, etc., the packaging container may include a guide component that allows the flowable material to flow out easily and a lid that cooperates with the guide component. Such a lid can be connected to the packaging container body in a variety of ways, for example, by bonding or welding to the inner and outer surfaces of the packaging container. Summary of the invention

[0003] The present disclosure provides a cover assembly, comprising: a flow guide component and a cover, wherein the flow guide component comprises a tube portion and a platform portion connected to the tube portion and surrounding the tube portion; and the cover can be releasably covered on the tube portion and seals the covering end of the tube portion; wherein at least the platform portion of the flow guide component is made of a composite material, wherein the composite material comprises high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is between 930-950 kg / m 3 within the range.

[0004] In at least some embodiments, based on the total weight of the composite material, the amount of the high density polyethylene is 40 wt % to 99 wt %, and the amount of the material selected from the group consisting of low density polyethylene, linear low density polyethylene and mixtures thereof is 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, on which a raised portion is provided, the raised portion being located between the outer periphery of the tube portion and the outer periphery of the platform and spaced apart from the outer periphery of the tube portion and the outer periphery of the platform.

[0007] In at least some embodiments, the raised portion is a substantially uniform raised 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, and the shortest distance between the outermost periphery of the raised ring and the outer periphery of the platform portion is d 1 , the maximum height of the convex ring is h, wherein h is in the range of 10% D to 30% D, d 1In the range of 1.0h to 2.0h.

[0008] In at least some embodiments, the shortest distance between the innermost periphery of the convex ring and the outer periphery of the cover is d 2 , where d 2 In the range of 1 / 3D to 4 / 5D.

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

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

[0011] In at least some embodiments, the outer periphery of the tube portion, the outer periphery of the platform portion, and the orthographic projection of the convex ring on the platform portion 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 guide component 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 in the tube portion or on the cover, and is configured to rotate as the cover rotates to cut the sealing sheet.

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

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

[0016] An embodiment of the present disclosure also provides a packaging container, comprising a cover assembly according to at least one embodiment of the present disclosure.

[0017] The present disclosure also provides a method for manufacturing a packaging container, comprising: providing a cover assembly, the cover assembly comprising a flow guide assembly and a cover, the flow guide component comprising a tube portion and a platform portion connected to the tube portion and surrounding the tube portion, the cover releasably covering the tube portion and sealing the covering end of the tube portion, wherein at least the platform portion of the flow guide component is made of a composite material, the composite material comprising high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is between 930-950 kg / m 3 The invention relates to a packaging container body; providing a packaging container body; forming a pre-opening on the packaging container body so that the shape and size of the pre-opening match the outer wall of the cover of the cover assembly; passing the cover of the cover assembly through the pre-opening from the inside to the outside; and connecting the cover assembly to the packaging container body by ultrasonically welding the surface of the platform facing the cover to the packaging container body, thereby obtaining the packaging container. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0019] Figure 1 A schematic diagram of the structure of a cover assembly provided in one embodiment of the present disclosure;

[0020] Figure 2A A schematic structural diagram 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 guide component of the cover assembly shown;

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

[0023] Figure 3 A photograph showing flashing during ultrasonic welding;

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

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

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

[0027] Figure 5 A schematic diagram of a packaging container provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" or similar terms are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Large-capacity packaging containers for packaging flowable materials are usually equipped with reusable lids to facilitate repeated opening and closing, thereby sealing the contents of the packaging container between multiple openings. For example, when the contents are liquid materials such as milk, juice, yogurt, etc., or solid flowable materials such as milk powder, solid beverages, etc., the packaging container can be equipped with a guide component that allows the flowable material to flow out easily and a lid that cooperates with the guide component, so that the container can be resealed using the lid after a portion of the flowable material is poured out. Such a lid can be connected to the packaging container body in a variety of ways, for example, by bonding or welding to the inner and outer surfaces of the packaging container.

[0031] Currently, packaging containers for packaging juice, milk or other types of non-alcoholic beverages may include composite carton packaging containers, and such packaging containers may include lids installed in different ways, for example, lids installed by bonding or ultrasonic welding. Conventional packaging container lids generally include single-sealing lids and double-sealing lids with secondary sealing mechanisms, examples of which include sealing sheets with pull rings that need to be manually pulled open and sealing sheets that are cut open by a preset opening mechanism in the lid.

[0032] Generally speaking, the inner layer of commonly used composite paper box packaging containers is often made of low-density polyethylene, while the lid of the packaging container is generally made of high-density polyethylene or low-density polyethylene. When high-density polyethylene is used to make the lid, due to the difference in melting point and crystallinity between the high-density polyethylene used as the lid and the low-density polyethylene used as the inner layer of the packaging container, the two are often difficult to weld during the ultrasonic welding process; in addition, the lid made of high-density polyethylene may crack or even be shattered due to ultrasonic vibration during the welding process. When low-density polyethylene is used to make the lid, the hardness of the lid is low and the ductility of the material is high. Therefore, in a double-sealed lid with a secondary sealing mechanism including a sealing sheet and a self-opening mechanism, the low-density polyethylene material is too soft to be easily cut.

[0033] To solve the above and other problems, the inventors have noticed 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. Since a certain amount of low-density polyethylene and / or linear low-density polyethylene is added to the composite material, the compatibility and bonding ability between the lid and the innermost low-density polyethylene of the packaging container during the ultrasonic welding process are improved; the structural stability of the lid during the ultrasonic welding process is improved, making it less likely to crack or break; the cutting performance of the sealing sheet in the secondary sealing mechanism of the lid is improved; and it is ensured that the sealing sheet can still be connected to the lid assembly after being cut and will not fall into the interior of the packaging container to contaminate the packaging contents.

[0034] The embodiments of the present disclosure provide a cover assembly, a packaging container, and a method for manufacturing the packaging container, wherein at least a platform portion of the cover assembly is formed by using a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, thereby improving the compatibility and bonding ability of the cover assembly with the innermost layer of the packaging container, so that the cover assembly can be safely and securely installed on the packaging container body by ultrasonic welding, thereby effectively sealing the packaging container and avoiding accidental damage to the cover assembly during the ultrasonic welding process.

[0035] The cover assembly provided by the embodiment of the present disclosure includes: a flow guide component and a cover, wherein the flow guide component includes a tube portion and a platform portion connected to the tube portion and surrounding the tube portion; the cover can be releasably covered on the tube portion and seals the covering end of the tube portion, wherein at least the platform portion of the flow guide component is made of a composite material, wherein the composite material includes high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is 930-950kg / m 3 within the range.

[0036] The present disclosure is described below by specific embodiments. In order to keep the following description of the embodiments of the present disclosure clear and concise, detailed descriptions of known functions and known components may be omitted. When any component of the embodiments of the present disclosure appears in more than one figure, the component may be represented by the same reference numeral in each figure.

[0037] Figure 1 FIG. 1 is a schematic diagram showing the structure of the cover assembly 1 provided in an embodiment of the present disclosure. Figure 1 As shown, the cover assembly 1 includes a cover 11 and a flow guide component 100, wherein the flow guide component 100 includes a tube portion 12 and a platform portion 13 connected to the tube portion 12 and surrounding the tube portion 12. The flow guide component 100 is made entirely of a composite material, the composite material includes high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is between 930-950 kg / m 3 within the range.

[0038] As we all know, polyethylene is a polymer material formed by the polymerization of ethylene monomers. It is one of the most commonly used synthetic resins in the world and is widely used in industry, agriculture, medicine, health, food and daily necessities. Polyethylene mainly includes high-density polyethylene, low-density polyethylene and linear low-density polyethylene. Various polyethylene materials are non-toxic, tasteless and odorless, and have good insulation, moisture-proof and anti-seepage properties. They are widely used in all walks of life.

[0039] As used herein, the term "high-density polyethylene (HDPE)" refers to the product of ethylene monomer polymerized under low pressure conditions under the catalysis of a Ziegler catalyst, also known as low-pressure polyethylene, with a density of 941-965 kg / m 3 High-density polyethylene has high crystallinity (65-85%) and softening point (125-135°C) and good mechanical properties such as high strength, high toughness and high rigidity, and 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 obtained by free radical polymerization of ethylene monomer under high pressure using oxygen or an organic peroxide as a catalyst, also known as high-pressure polyethylene, with a density of 910-940 kg / m 3 Low-density polyethylene is chemically inert, has good sealing ability, and is easy to mold and process. It is one of the most widely used materials in today's polymer industry, especially in food industry packaging. Unlike the linear structure of other polyethylene materials such as high-pressure polyethylene and linear low-density polyethylene, low-density polyethylene made by high-pressure means has a branched structure and long chain branches, which also gives conventional low-density polyethylene 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 a relatively low temperature and pressure, with very short comonomer branches on the linear ethylene main chain. It is non-toxic, tasteless, odorless, and has a density of 915-935 kg / m 3 The linear low-density polyethylene formed by copolymerization has a narrower molecular weight distribution than general low-density polyethylene. At the same time, its linear structure gives it different rheological properties and has enhanced tensile resistance, penetration resistance, impact resistance, and environmental stress cracking resistance.

[0042] In view of the advantages and disadvantages of high-density polyethylene, low-density polyethylene and linear low-density polyethylene respectively, the inventors, after in-depth research and great efforts, have developed a composite material with good comprehensive properties for forming at least a part of the cover 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 40wt% and 99wt%, for example, between 40wt%, 45wt%, 50wt%, 55wt%, 65wt%, 70wt%, 75wt% and 80wt%, 85wt%, 90wt%, 95wt%, 97wt%, 98wt% or 99wt% or any range combined from the above endpoints; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1wt% and 60wt%, for example, between 1wt%, 2wt%, 3wt%, 5wt%, 10wt%, 15wt%, 20wt% and 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt% or any range combined from the above endpoints. In a further example, the low-density polyethylene and / or linear low-density polyethylene can be all linear low-density polyethylene or all low-density polyethylene, or the low-density polyethylene and / or linear low-density polyethylene can be any mixture of the two. The composite material comprising a mixture of high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene in the above content range has good comprehensive properties. For example, the addition of low-density polyethylene and / or linear low-density polyethylene allows the lid formed by the composite material to be better combined with the innermost low-density polyethylene layer of the packaging container, and prevents the lid formed by the composite material from cracking or even 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 part through the upper welding part (such as the welding head, etc.), and friction heat is generated between the two surfaces to be welded under appropriate pressure, resulting in instantaneous fusion. The strength of the weld formed thereby can be equivalent to that of the main body. By adopting suitable workpieces and reasonable interface design, ultrasonic welding can make the welded part achieve watertight and airtight bonding strength, and eliminate the inconvenience caused by the use of auxiliary products, thereby achieving efficient and clean welding. During ultrasonic welding, due to the injection of ultrasonic energy for welding, the non-welded parts of the welded parts may crack or break, so it is necessary to use materials with suitable composition to form the parts to be welded. When developing the cap assembly described in the embodiments of the present disclosure, the inventors used a blend / composite material 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 the present disclosure, and found that the cap assembly made of such a blend / composite material has good strength and toughness and anti-cracking properties, and can be safely and securely installed on the packaging container body by ultrasonic welding, so as to effectively seal the packaging container, and avoid accidental damage to the cap assembly during the ultrasonic welding process. In the cap assembly provided in the above embodiments, the strength and toughness of the cap assembly are improved by using a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene to form the cap assembly, so that the cap assembly can be safely and securely installed on the packaging container body by ultrasonic welding, so as to effectively seal the packaging container, and avoid accidental losses caused by cracking or breaking of the cap assembly during the ultrasonic welding process.

[0044] exist Figure 1 In the illustrated cover assembly, the guide component 100 is described as being formed entirely of a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene. It is understandable that in other embodiments of the present disclosure, only the above-mentioned composite material may be used to form the platform portion of the guide component, and another suitable material such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene and / or polypropylene (PP) may be used to form the pipe portion of the guide component, and the two may be combined together to form the entire guide component.

[0045] Figure 2A A schematic structural diagram of a cover assembly provided by another embodiment of the present disclosure is shown; Figure 2B Shows Figure 2A A schematic front view of the structure of the guide component of the cover assembly shown; Figure 2C Shows Figure 2A A schematic top view of the structure of the guide component of the cover assembly is shown.

[0046] Figure 2A-2C The structure of the guide member 100 is substantially similar to Figure 1 The guide component 100 shown in the figure is further provided with a convex ring 14 on the upper surface of the platform 13 (i.e., the surface facing the cover). As shown in the figure, the convex ring 14 is a substantially uniform annular flange surrounding the tube portion 12 that protrudes upward from the upper surface of the platform 13. 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 convex 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 930-950 kg / m 3 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 40 wt%, 45 wt%, 50 wt%, 55 wt%, 65 wt%, 70 wt%, 75 wt% and 80 wt%, 85 wt%, 90 wt%, 95 wt%, 97 wt%, 98 wt% or 99 wt% or any combination of the above endpoints; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1 wt%. To 60wt%, for example, between 1wt%, 2wt%, 3wt%, 5wt%, 10wt%, 15wt%, 20wt% to 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt% or any range combined from the above endpoints, wherein the low density polyethylene and / or linear low density polyethylene can be all low density polyethylene or all linear low density polyethylene, or can be any mixture of the two.

[0047] Figure 2A-2C In the embodiment shown, the shortest distance between the outer periphery of the cover 11 and the outer periphery of the platform 13 is D, and the shortest distance between the outer periphery of the convex ring 14 and the outer periphery of the platform 13 is d. 1 The maximum height of the protruding ring 14 is h, wherein h is in the range of 10% D to 30% D, and d 1In 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 table and the height of the convex ring within the above range can effectively prevent overflow and insufficient welding during ultrasonic welding. As used herein, the term "overflow" refers to the phenomenon that the material melted on the welding surface due to the introduction of ultrasonic energy extends beyond the outer periphery of the table of the lid during ultrasonic welding. Small pieces of overflow protruding from the outer periphery of the table of the lid may break and fall into the interior of the package due to vibration caused by ultrasonic energy or other reasons during ultrasonic welding, thereby causing contamination of the contents of the package, so overflow must be avoided. As used herein, the term "insufficient welding" refers to the phenomenon that the material melted on the welding surface due to the introduction of ultrasonic energy during ultrasonic welding is not enough to completely weld the upper surface of the table with the inner surface of the package, resulting in a gap between the portion of the upper surface of the table close to the periphery and the inner surface of the package due to the lack of welding melt. In the subsequent packaging sterilization process, such gaps may not be effectively sterilized, resulting in hygiene risks. The embodiment of the present disclosure can effectively prevent the occurrence of flashing and insufficient welding by appropriately setting the distance 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. On the other hand, the shortest distance between the inner periphery of the convex ring 14 and the outer periphery of the cover is d 2 , where d 2 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 the above range can effectively prevent poor sealing caused by welding deviation during ultrasonic welding and possible leakage problems caused thereby.

[0048] Figure 2A-2C In the embodiment of FIG. 1 , the cross section of the protruding ring 14 is a triangle, the base of the triangle is located on the upper surface of the platform 13, and the vertex is the highest point of the protruding ring 14 in a direction perpendicular to the platform 13. Figure 2A-2C As shown, the distance between the apex of the triangle and the outer periphery of the convex ring 14 is less than the distance between the apex of the triangle and the inner periphery of the convex ring 14, that is, the apex of the triangle is biased toward the outer periphery of the convex ring. The convex ring with such a triangular cross-section can effectively prevent the problems of insufficient welding and welding deviation during ultrasonic welding.

[0049] Figure 2A-2C In the embodiment of the present invention, the cross section of the convex ring 14 is described as a triangle with the vertex leaning outward. It is understandable 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 boats, etc.

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

[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 substantially parallel concentric rings (i.e., their orthographic projections on the platform 13 are concentric circles). However, it is understandable that in other embodiments, the outer periphery of the tube, the convex ring and the outer periphery of the platform, one or some or all of them may also have other shapes. For example, the outer periphery of the tube, the convex ring and the outer periphery of the platform, one or some or all of them may also be regular or irregular shapes such as concentric or non-concentric ellipses, rectangles, rhombuses, squares, stars or rounded rectangles. Alternatively, a plurality of discontinuous convex points, bosses and / or flanges may also be formed on the upper surface of the platform as a raised portion around the outer periphery of the tube. The disclosed embodiments are not limited to this.

[0052] Figure 2A-2C In the illustrated embodiment, the integral molding of the tube portion 12, the platform portion 13 and the convex ring 14 is described as an example. It can be understood that in other embodiments, the same or different materials can be used to form one, some or all of the tube portion, the platform portion and the convex ring respectively, and they can be assembled together by methods such as welding, as long as the platform portion is formed of a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene.

[0053] Figure 2A-2CIn the illustrated embodiment, at least the platform portion of the cover assembly is formed by using a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, thereby improving the strength and toughness of the cover assembly, so that the cover assembly can be safely and firmly installed on the packaging container body by ultrasonic welding, so as to effectively seal the packaging container and avoid accidental loss caused by cracking or breaking of the cover assembly during the ultrasonic welding process; during the ultrasonic welding process, a raised portion is provided on the platform, so that the ultrasonic energy transmitted during the ultrasonic welding process is more easily concentrated on the upper edge or upper surface of the raised portion, so that the cover assembly can be better bonded to the packaging container body by ultrasonic welding, avoiding leakage problems caused by poor welding of individual parts; the shape and structural parameters of the raised portion are designed to avoid possible overflow and insufficient welding problems as well as poor sealing problems caused by welding deviation.

[0054] Figures 4A-4C FIG. 1 shows a schematic structural diagram of a cover assembly provided by another embodiment of the present disclosure, wherein: Figure 4A A cross-sectional schematic diagram of a 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 a flow guide component 100 of a cover assembly is shown; Figure 4C for Figure 4A An exploded schematic diagram of the cover assembly is shown.

[0055] like Figures 4A-4C As shown, the cover assembly 1 includes a flow guide component 100 and a rotating cover 11. The flow guide component 100 includes a tube portion 12, a platform portion 13, a sealing sheet 15 and a self-opening component 16. Figures 4A-4C As shown, the tube 12 extends along the z direction (including the +z or -z direction) and includes a first nozzle and a second nozzle opposite to each other in the z direction. The rotating cover 11 can be releasably covered on the first nozzle to seal the first nozzle. The platform 13 is connected to the second nozzle of the tube 12 and extends outward around the second nozzle. Two substantially parallel and substantially uniform convex rings 14 and 14' are provided on the upper surface of the platform 12 (i.e., the surface facing the cover 200) as a convex portion. Both convex rings 14 and 14' are annular flanges protruding upward from the upper surface of the platform 13, and they are both located between the outer periphery of the tube 12 and the outer periphery of the platform 13, spaced from each other, and are spaced apart from both the outer periphery of the tube 12 and the outer periphery of the platform 13. The sealing sheet 15 is connected to the platform 13 and seals the second nozzle of the tube 12. The tube 12, the platform 13, the convex rings 14 and 14' and the sealing sheet 15 are integrally formed and are formed of a composite material, the composite material comprising high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is 930-950 kg / m 3The self-opening member 16 is installed in the pipe portion 12 and is configured to rotate with the rotation of the rotary cover 11 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 40wt% and 99wt%, for example, between 40wt%, 45wt%, 50wt%, 55wt%, 65wt%, 70wt%, 75wt% and 80wt%, 85wt%, 90wt%, 95wt%, 97wt%, 98wt% or 99wt% or any range combined from the above endpoints; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1wt% and 60wt%, for example, between 1wt%, 2wt%, 3wt%, 5wt%, 10wt%, 15wt%, 20wt% and 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt% or any range combined from the above endpoints. In further examples, the low density polyethylene and / or the linear low density polyethylene may be all linear low density polyethylene or all low density polyethylene, or the low density polyethylene and / or the linear low density polyethylene may be any mixture of the two.

[0057] Figures 4A-4C In the embodiment shown, the shape of the protruding rings 14, 14' is similar to Figure 2A-2C In addition, the shortest distance between the outer periphery of the cover 11 and the outer periphery of the platform 13 is D, and the shortest distance between the outer periphery of the convex ring 14 located on the outside and the outer periphery of the platform 13 is d 1 The shortest distance between the inner periphery of the inner convex ring 14' and the outer periphery of the cover 12 is d 2 The maximum heights of the convex rings 14 and 14' are h 1 and h 2 , where h 1 and h 2 Each of which is within the range of 10% D to 30% D; d 1 In h 1 and h 2 The larger of the two is within the range of 1.0 to 2.0 times; d 2 In the range of 1 / 3D to 4 / 5D; the distance between the highest points of the protruding rings 14, 14' in the radial direction is at least (h 1 +h 2By controlling the shortest distance between the outer periphery of the outermost convex ring and the outer periphery of the platform, the shortest distance between the inner periphery of the innermost convex ring and the outer periphery of the cover, and the height of the convex ring within the above ranges, it is possible to effectively prevent problems such as 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 cover 11 includes a connection structure, such as an internal thread, located on its inner side wall, and the internal thread is configured to cooperate with the external thread of the tube 12. In this way, when the first tube opening of the tube 12 is opened or sealed by the rotating cover 11, the external thread of the tube 12 and the internal thread of the rotating cover 11 can be disengaged or engaged with each other, thereby improving the sealing of the packaging container and the convenience of use.

[0059] In other examples, the tube 12 may further include an internal connection structure, such as an internal thread, located on its inner wall. The self-opening component 16 includes an external thread located on its outer portion, and the external thread is configured to cooperate with the internal thread of the tube 12, so that the self-opening component 16 can rotate and move in a direction away from the sealing sheet 15 (e.g., the +z direction shown in the figure) or in a direction close to the sealing sheet 15 (e.g., the -z direction shown in the figure) as the rotating cover 11 rotates. For example, the self-opening component 16 is coaxially arranged with the tube 12, and is configured so that when the wall portion of the rotating cover 11 rotates and moves upward in the +z direction, the self-opening component 16 rotates and moves downward in the -z direction, thereby cutting the sealing sheet 15 arranged at the second pipe opening of the tube 12.

[0060] In some other examples, a weakened area may be provided on the sealing sheet 15, and the self-opening component 16 may pierce and cut the sealing sheet 15 in the weakened area. For example, the weakened area may be an imprint along at least a portion of the inner circumference of the second nozzle of the tube portion 12. In a preferred aspect, the weakened area may be provided so that the self-opening component 16 cannot completely cut the sealing sheet 15 when rotating with the rotating cover 11, so as to prevent the cut sealing sheet 15 from detaching from the cover 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 protruding rings 14 and 14' are both triangles whose bases are located on the upper surface of the platform 13, and the vertices of the two triangles are the highest points of the protruding 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 smaller 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 toward the outer periphery of the corresponding convex ring. The convex ring with such a triangular cross-section can effectively prevent the problems of insufficient welding and welding deviation during ultrasonic welding.

[0062] Figures 4A-4C In the embodiment, the cross section of the convex ring 14, 14' is described as a triangle with the vertex leaning outward. It can be understood that in other embodiments, convex rings with other cross-sectional shapes can also be used, including but not limited to, cross sections of isosceles / equilateral triangles, rectangles, squares, semicircles, inverted boats, etc.

[0063] Figures 4A-4C In the illustrated embodiment, the cover 11 is described as a rotating cover. It is understandable that in other embodiments, the cover may be a cover having other structures such as a snap-on portion, as long as the cover can be conveniently connected to the assembly in a repetitive manner.

[0064] Figures 4A-4C In the illustrated embodiment, the sealing sheet 15 is configured to be connected to the platform 13 and seal the second pipe opening of the tube portion 12 as an example for description. It can be understood that in other embodiments, the sealing sheet can also be configured to 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 can also be disposed in the middle of the tube portion or disposed close to the first pipe opening of the tube portion, as long as it can seal the tube portion.

[0065] Figures 4A-4C In the illustrated embodiment, the use of a self-opening component 16 disposed in the tube portion 12 and capable of rotating and moving along the z direction to cut the sealing sheet 15 is described as an example. It is understandable that in other embodiments, self-opening components of other structures may also be used, as long as they can cut or otherwise destroy the sealing sheet as the cover and the guide component are separated; alternatively, 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 provided with a pull ring structure that is manually pulled open.

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

[0067] exist Figures 4A-4CIn the illustrated embodiment, at least the platform portion of the cover assembly is formed by using a composite material including high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, thereby improving the strength and toughness of the cover assembly, so that the cover assembly can be safely and firmly installed on the packaging container body by ultrasonic welding, so as to effectively seal the packaging container and avoid accidental loss caused by cracking or breaking of the cover assembly during the ultrasonic welding process; during the ultrasonic welding process, the convex ring design on the platform makes it easier to concentrate the ultrasonic energy transmitted during the ultrasonic welding process on the upper edge or upper surface of the convex ring, so that the cover assembly can be better combined with the packaging container body by ultrasonic welding, avoiding leakage problems caused by poor welding of individual parts; providing two basically parallel convex rings avoids possible overflow problems caused by excessive material in individual parts, and further avoids the problem of contamination of the container contents caused by overflow and breakage; the shape and structural parameters of the convex ring are designed to avoid overflow or insufficient welding problems and poor sealing problems caused by welding deviation.

[0068] In some embodiments, one, some or all of the flow guide component, the cover, and any 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 guide member and the cover of the cover assembly. For example, based on the total weight of the guide member, the amount of the slip agent added to the guide member may be in the range of 0.01 to 2.5 wt%, for example, between 0.1 wt% and 2.4 wt%, between 0.5 wt% and 2.3 wt%, between 1.0 wt% and 2.0 wt%, etc.; and / or, based on the total weight of the cover, the amount of the slip agent added to the cover may be in the range of 0.01 to 2.5 wt%, for example, between 0.1 wt% and 2.4 wt%, between 0.5 wt% and 2.3 wt%, between 1.0 wt% and 2.0 wt%, etc. In general, adding a slip agent to the guide member and / or the cover helps to reduce the film cutting force of the member and increase the over-rotation torque, so that the user can more easily cut off the sealing sheet and not easily slide the cover when opening the cover. In some examples, a slip agent may be used in both the guide member and the cover. In other examples, a slip agent may be used only in the flow guide component but not in the cover to prevent over-rotation problems.

[0070] The embodiments of the present disclosure also provide a packaging container, which includes any one of the cover assemblies described in the embodiments of the present disclosure. Figure 5 FIG. 1 is a schematic diagram of a packaging container 1000 provided in an embodiment of the present disclosure. Figure 5 As shown, the packaging container 1000 provided by the embodiment of the present disclosure includes: a cover 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 (z direction as shown in the figure), the side is connected between the top and the bottom. The top is a roof-like structure with a preset opening, and the cover assembly 1 passes through the main body 2 from the inside to the outside through the preset opening and is connected to the main body 2.

[0072] In order to prevent the deterioration of the package contents such as liquid, gel or powder and other flowable solids, 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 can include an ink layer with a printable pattern, an outer polymer layer, a support layer, a water and oxygen barrier layer and an inner polymer layer, etc., which are arranged in sequence.

[0073] The disclosed embodiment is described by taking the top as a roof-shaped part and having a preset opening connected to the cover assembly 1 on the slope surface of the roof-shaped part as an example. It can be understood that in other embodiments, the top can also be set to be a flat roof-shaped part and have an end opening connected to the cover assembly 1 at the top plane of the flat roof-shaped part; or the top can also be a plane or other shapes. The disclosed embodiment is not limited to this.

[0074] In the packaging container provided in the above embodiments, by using a composite material including high-density polyethylene and 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 on the packaging container body through ultrasonic welding, so as to effectively seal the packaging container and avoid accidental losses caused by cracking or breakage of the cover assembly during the ultrasonic welding process.

[0075] The present disclosure also provides a method for manufacturing a packaging container, comprising: providing a cover assembly, the cover assembly comprising a flow guide assembly and a cover, the flow guide component comprising a tube portion and a platform portion connected to the tube portion and surrounding the tube portion, the cover releasably covering the tube portion and sealing the covering end of the tube portion, wherein at least the platform portion of the flow guide component is made of a composite material, the composite material comprising high-density polyethylene and low-density polyethylene and / or linear low-density polyethylene, wherein the density of the composite material is between 930-950 kg / m 3 The invention relates to a packaging container body, wherein the packaging container body is provided with a pre-opening, wherein the shape and size of the pre-opening match the outer wall of the tube portion of the guide component of the cover assembly; the tube portion is passed through the pre-opening from the inside to the outside; and the cover assembly is connected to the packaging container body by ultrasonically welding the surface of the platform portion facing the cover to the packaging container body, thereby obtaining 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 40wt% and 99wt%, for example, between 40wt%, 45wt%, 50wt%, 55wt%, 65wt%, 70wt%, 75wt% and 80wt%, 85wt%, 90wt%, 95wt%, 97wt%, 98wt% or 99wt% or any range combined from the above endpoints; the amount of low-density polyethylene and / or linear low-density polyethylene can be between 1wt% and 60wt%, for example, between 1wt%, 2wt%, 3wt%, 5wt%, 10wt%, 15wt%, 20wt% and 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt% or any range combined from the above endpoints. In further examples, the low density polyethylene and / or the linear low density polyethylene may be all linear low density polyethylene or all low density polyethylene, or the low density polyethylene and / or the linear low density polyethylene may be any mixture of the two.

[0077] In the packaging container manufacturing method provided in the above-mentioned embodiment, by using a composite material including high-density polyethylene and 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 on the packaging container body through ultrasonic welding, so as to effectively seal the packaging container and avoid accidental loss caused by cracking or breakage of the cover assembly during the ultrasonic welding process; by passing the cover assembly from the inside to the outside through a preset opening on the packaging container body that matches the shape and size, the cover assembly can be firmly clamped on 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 be further explained in detail below with reference to examples and comparative examples. However, it should be understood by those skilled in the art that these examples and comparative examples are provided for illustrative purposes only and are not intended to limit the present invention.

[0080] Preparation example:

[0081] Reference Figure 2A-2C , Figures 4A-4C and Table 1 below, a cap assembly and a comparative cap assembly are manufactured, wherein the flow guide component (including the tube portion, the platform portion, and the possible convex ring and the sealing sheet therein) is integrally formed by injection molding. Wherein, if the cap assembly includes a convex ring, the convex ring or multiple convex rings meet the following conditions:

[0082] The raised ring or rings are substantially uniform rings around the tube;

[0083] The shortest distance between the outer periphery of the cover and the outer periphery of the platform is D, and the shortest distance between the outer periphery of the outermost convex ring and the outer periphery of the platform is d 1 The shortest distance between the inner circumference of the innermost convex ring and the inner circumference of the platform is d 2 ;

[0084] In the case of one 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 portion toward the outer periphery of the platform portion, the maximum heights of the two convex rings are h 1 and h 2 ;

[0085] Where h is in the range of 10% D to 30% D, or h 1 and h 2 Any one of them is within 10%

[0086] D to 30% D range; d 1 In the range of 1.0h to 2.0h, or d 1 In h 1 、h 2 ……h n The range is 1.0 to 2.0 times of the largest one; d 2 In the range of 1 / 3D to 4 / 5D; the distance between the highest points of the two convex rings in the radial direction is at least (h 1 +h 2 ) is 0.5 times.

[0087] Table 1. Fabrication of lid assembly

[0088]

[0089]

[0090] Note: 1) HDPE stands for high-density polyethylene, LLDPE stands for linear low-density polyethylene, and PP stands for polypropylene;

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

[0092] 3) The weight percentage of the slip agent is based on the total weight of the flow guide member or cover.

[0093] Test Case

[0094] 1. Welding performance test

[0095] The cover assembly 1-7 manufactured as above is mounted on the packaging container body by ultrasonic welding to form a Figure 5The packaging container shown in the figure was prepared and its performance was tested. The results are shown in Table 2 below. The push-out force refers to the force required to push the cover assembly after welding to separate it from the packaging container body.

[0096] Table 2. Welding performance test results of the cover assembly of the embodiment of the present disclosure

[0097]

[0098]

[0099] Note: 1) The welding time needs to be less than 0.27s to meet the processing requirements of the production line;

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

[0101] 3) It must be completely welded with the fiber layer inside the packaging container, otherwise it will be considered as poor welding.

[0102] It can be seen from the above test results that when the ultrasonic welding energy and amplitude are low, the platform of the cover assemblies 6 and 7 in which the flow guide components are completely made of HDPE cannot be completely welded with the fiber layer in the packaging container body, and when the ultrasonic welding energy and amplitude are high, overflow will occur, and the welding time of these cover assemblies is too long, making it difficult to find a suitable working window. In contrast, the platform of the cover assembly in which the flow guide components are made of a composite material including HDPE and LDPE and / or LLDPE described in the embodiment of the present disclosure can be well welded with the packaging container body to form a strong welding bond; when one or two convex rings are added, the platform can achieve good welding and strong bonding at lower ultrasonic welding energy and amplitude with a shorter welding time, and no overflow will occur, thereby providing a looser working window for installing the cover assembly to the packaging container body by ultrasonic welding.

[0103] 2. Torque performance test

[0104] As described in the preparation example, 60 cap assemblies 3 and 8 were prepared and stored at room temperature for 3 days. Then, each cap assembly was divided into three groups (20 in each group) and each group was placed at room temperature, 3°C and 35°C for at least 24 hours.

[0105] The cap assembly was fixed and locked on a torque tester (Mecmesin Tornado) with a clamp, and then the cap of the cap assembly was grasped and rotated using a cap grabber, and the torque was recorded. The results are shown in Table 3 below.

[0106] Table 2. Torque performance test results of the cover assembly of the embodiment of the present disclosure

[0107]

[0108] It can be seen from the above test results that adding a slip agent to the guide component and / or the cover can effectively reduce the puncture torque and increase the over-rotation torque, so that the manufactured cover assembly can cut the sealing sheet more easily and is not easy to slide. Compared with the cover assembly 3 in which the slip agent is added only to the guide component but not to the cover, the cover assembly 8 in which the slip agent is added to both the guide component and the cover has a lower puncture torque but a lower over-rotation torque, so the cover assembly 8 can cut the sealing sheet more easily but there is a certain possibility of over-rotation.

[0109] As can be seen from the above embodiments, in the cap assembly and packaging container and the manufacturing method of the packaging container provided by the above embodiments of the present disclosure, by using a composite material including high-density polyethylene and 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, so that the cap assembly can be safely and firmly installed on the packaging container body by ultrasonic welding, so as to effectively seal the packaging container, and avoid accidental loss caused by cracking or breaking of the cap assembly during ultrasonic welding; during the ultrasonic welding process, the convex ring design on the platform makes it easier to concentrate the ultrasonic energy transmitted during ultrasonic welding on the upper edge or upper surface of the convex ring, so that the cap assembly can be better combined with the packaging container body by ultrasonic welding, avoiding leakage problems caused by poor welding of individual parts; two substantially parallel convex rings avoid possible overflow problems caused by excessive material in individual parts, and thus avoid the problem of contamination of container contents caused by overflow breakage. By passing the cap assembly from the inside to the outside through the preset opening of the shape and size matching on the packaging container body, the cap assembly can be firmly stuck on the packaging container, effectively preventing the cap assembly from accidentally falling off from the packaging container due to external force.

[0110] In this article, there are a few points to note:

[0111] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0112] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

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

[0114] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A cover assembly, comprising: A flow guide member and a cover, wherein The flow guide component comprises a tube portion and a platform portion connected to the tube portion and surrounding the tube portion; and the cover is releasably covered on the tube portion and seals the covered end of the tube portion; Wherein, at least the platform of the guide component is made of a composite material, wherein the composite material comprises high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is between 930-950 kg / m 3 within the range.

2. The cap assembly according to claim 1, wherein: Based on the total weight of the composite material, The amount of the high-density polyethylene is 40wt% to 99wt%, The amount of the material selected from the group consisting of low density polyethylene, linear low density polyethylene and a mixture thereof is 1 wt % to 60 wt %.

3. The cap assembly according to claim 1, wherein: The material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof is linear low-density polyethylene.

4. The cap assembly according to any one of claims 1 to 3, wherein: The surface of the platform facing the cover is an upper surface, A convex portion is provided on the upper surface, The raised portion is located between the outer circumference of the tube portion and the outer circumference of the platform portion and is spaced apart from both the outer circumference of the tube portion and the outer circumference of the platform portion.

5. The cap assembly according to claim 4, wherein: The raised portion is a substantially uniform raised ring surrounding the tube portion, 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 periphery of the convex ring and the outer periphery of the platform is d1, The maximum height of the convex ring is h, Here, h is in the range of 10%D to 30%D, and d1 is in the range of 1.0h to 2.0h.

6. The cap assembly according to claim 5, wherein: The shortest distance between the innermost periphery of the convex ring and the outer periphery of the cover is d2, Among them, d2 is in the range of 1 / 3D to 4 / 5D.

7. The cap assembly according to claim 6, wherein: A minimum distance between a highest point of the protruding ring in a direction perpendicular to the upper surface of the stage and an outer periphery of the protruding ring is smaller than a minimum distance between the highest point and an inner periphery of the protruding ring.

8. The cap assembly according to claim 7, wherein: The raised portion is at least two substantially parallel and substantially uniform raised rings around the tube portion, wherein: The maximum height of each of the convex rings is within 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.

9. The cap assembly according to claim 8, wherein: The outer periphery of the tube portion, the outer periphery of the platform portion, and the orthographic projection of the convex ring on the platform portion are concentric circles.

10. The cap assembly according to any one of claims 1 to 3, further comprising: A sealing sheet for sealing the pipe portion, wherein the flow guide component and the sealing sheet are integrally formed and made of the composite material.

11. The cover assembly of claim 10, further comprising: Self-opening components, wherein The cover is a rotating cover, The self-opening component is arranged in the tube portion or on the cover, and is configured to rotate with the rotation of the cover to cut the sealing sheet.

12. The cap assembly according to any one of claims 1 to 3, wherein: At least one of the flow guide member and the cover further includes a slip agent.

13. The cap assembly according to claim 12, wherein: The amount of the slip agent 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 slip agent in the cover is in the range of 0.01 wt % to 2.5 wt % based on the total weight of the cover.

14. A packaging container comprising the lid assembly according to any one of claims 1 to 13.

15. A method for manufacturing a packaging container, comprising: A cover assembly is provided, the cover assembly comprising a flow guide assembly and a cover, the flow guide component comprising a tube portion and a platform portion connected to the tube portion and surrounding the tube portion, the cover is releasably covered on the tube portion and seals the covered end of the tube portion, wherein at least the platform portion of the flow guide component is made of a composite material, the composite material comprising high-density polyethylene and a material selected from low-density polyethylene, linear low-density polyethylene and a mixture thereof, wherein the density of the composite material is between 930-950 kg / m 3 within the scope; Providing a packaging container body; forming a pre-opening on the packaging container body so that the shape and size of the pre-opening match the outer wall of the cover of the cover assembly; Passing the cover of the cover assembly through the pre-opening from the inside to the outside; and The packaging container is manufactured by connecting the cover assembly to the packaging container body by ultrasonically welding a surface of the stage portion facing the cover to the packaging container body.

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