Fan blade for a cup and cup

Abstract

The cup sector and cup provided by the application can solve the problem of curling defects caused by stress concentration of curled edge material of the edge sealing part during the forming of the disposable cup under the requirement of high curling degree. The cup sector comprises a sector ring part, a curled edge part and an edge sealing part. The sector ring part has an upper arc edge, a lower arc edge arranged concentrically with the upper arc edge, a left edge extending radially from a left end of the lower arc edge to the upper arc edge, and a right edge extending radially from a right end of the lower arc edge to the upper arc edge. The curled edge part extends circumferentially along the upper arc edge of the sector ring part. The edge sealing part extends radially along the left edge or the right edge of the sector ring part to the curled edge part. The edge sealing part is provided with a notch adjacent to the curled edge part. The notch extends taperingly from a side of the edge sealing part away from the curled edge part to a direction close to the curled edge part.

Description

Technical Field

[0001] This application relates to the field of disposable cups, and in particular to a cup fan for processing disposable cups. Background Technology

[0002] Currently, the demand for high-quality disposable cups in the coffee, milk tea, and other beverage industries is growing rapidly. To enhance the cup's sealing performance, structural strength, and user comfort, disposable cups are designed with a high degree of curl during molding. Conventional cups, formed using fan-shaped blades under high curl requirements, have a double-layered, high-hardness, and strong resistance to deformation edge curling. This concentrated curling pressure during molding makes the process difficult, resulting in uneven edges, irregular cup rim shapes, and even bursting, ultimately affecting the cup's structural strength, rim aesthetics, and lid seal. In such cases, when a fine curl diameter is also required, a thick edge at the sealing edge can even prevent the cup from being molded at all.

[0003] Existing technologies typically improve the quality of the rolled edge at the sealing edge of cups with high curvature by designing special molding molds. However, this approach requires repeated processing of mold parts and multiple tests, adjustments, and revisions by professional personnel to finally meet the sealing requirements of the cap, resulting in high production and labor costs. Utility Model Content

[0004] The purpose of this application is to provide a fan blade for cups that can solve the problem of insufficient sealing of the lid of disposable cups caused by defects in the rolled edge.

[0005] Based on this, the embodiments of this application disclose a fan blade for a cup, comprising: The fan ring portion has an upper arc edge, a lower arc edge arranged concentrically with the upper arc edge, a left edge extending radially from the left end of the lower arc edge to the left edge of the upper arc edge, and a right edge extending radially from the right end of the lower arc edge to the right edge of the upper arc edge; a rolled opening portion extending circumferentially along the upper arc edge of the fan ring portion; and a sealing edge portion extending radially along the left or right edge of the fan ring portion to the rolled opening portion; the sealing edge portion has a notch adjacent to the rolled opening portion, and the notch gradually narrows from the side of the sealing edge portion away from the rolled opening portion toward the direction closer to the rolled opening portion.

[0006] By employing the above technical solution, the notch interrupts the continuous stress transmission at the rolled edge of the sealing section, allowing stress to be released outwards at the edge of the notch, preventing excessive stress concentration in a single area. The notch also transforms the triaxial tensile stress state generated during rolling into a biaxial stress state along the gradually expanding direction of the notch, reducing the difficulty of plastic deformation of the material. Simultaneously, the rolled edge at the notch is formed from a single layer of material instead of two, mitigating excessive stress concentration caused by abrupt changes in thickness and stiffness. With the reduced concentrated stress, the difficulty of rolling the sealing section decreases, thus preventing defects in the rolled edge after molding. This ensures the structural strength of the disposable cup formed from the fan-shaped blade, while improving the sealing performance after mating with the lid, meeting higher leak detection standards, and significantly reducing production and labor costs.

[0007] According to one embodiment of this application, the minimum distance between the notch and the upper edge of the sealing portion along the radial direction of the fan ring portion is between 1 mm and 8 mm.

[0008] By employing the above technical solution, the minimum distance between the notch along the radial direction of the fan ring and the upper edge of the sealing section is controlled. This ensures optimized stress distribution and alters the stress transmission path while maintaining the structural strength of the cup fan blade after it has been formed into a cup. When the distance between the notch along the radial direction of the fan ring and the upper edge of the sealing section is too close, it exacerbates stress concentration during the edge-rolling process of the cup fan blade, undermining the circumferential stiffness of the rolled edge and causing notch deformation or even breakage. When the distance between the notch along the radial direction of the fan ring and the edge of the sealing section is too far, it cannot cover the stress concentration points generated by the rolling stress during the rolling process. The notch not only loses its function of reducing concentrated stress but may even introduce more stress, exacerbating the rolling defects.

[0009] According to one embodiment of this application, the maximum width of the notch along the radial direction of the fan ring is between 4.5 mm and 16.5 mm. This technical solution fully releases stress while preserving the structural strength of the cup fan blade. If the maximum width of the notch along the radial direction of the fan ring is too narrow, insufficient stress release will result in micro-cracks forming at the edge of the notch. If the width of the notch along the radial direction of the fan ring is too wide, the area covered by the notch will extend beyond the rolled opening towards the lower arc edge of the fan ring. After the cup fan blade is rolled and formed, a notch will appear on the cup body below the rolled opening, affecting not only aesthetics but also reducing the sealing area near the rolled opening in the height direction of the cup body, changing from a double-layer structure to a single-layer structure, reducing sealing performance and structural strength, and resulting in insufficient load-bearing capacity.

[0010] According to one embodiment of this application, the maximum depth of the notch is between 1.1 mm and 6.25 mm.

[0011] Using the above technical solution, the depth direction of the notch is the width direction of the sealing part. Controlling the maximum depth within a reasonable range can cut the stress transmission chain to the greatest extent, reduce stress concentration at the rolled edge of the sealing part, and ensure the quality of the rolled edge. If the maximum depth of the notch is insufficient, it will not be able to cut the stress chain. If the maximum depth of the notch is too deep, it will affect the sealing quality at the notch, reduce the sealing performance of the cup body after molding, and increase the risk of leakage.

[0012] According to one embodiment of this application, the deepest part of the notch corresponds to the upper arc edge of the fan ring.

[0013] Using the above technical solution, the upper arc edge of the fan ring is the position where the stress is most concentrated during the rolling process of the cup fan blade. By setting the deepest part of the notch to correspond with the upper edge of the fan ring, the notch can accurately cover the stress concentration point, reduce the stress peak, and reduce the occurrence of rolling cracks.

[0014] According to one embodiment of this application, the notch has an arc edge and a straight edge tangent to the arc edge.

[0015] By adopting the above technical solution, the curved edge and the straight edge tangent to the curved edge form a gap for smooth edge transition, which releases the stress concentrated at the edge sealing roll opening outward along the curved edge and the straight edge, reduces stress concentration at this point, and improves the quality of the roll opening.

[0016] According to one embodiment of this application, the central angle of the arc edge is greater than 90° and less than 180°; the center of the arc edge is located on the side of the sealing portion facing away from the rolled opening portion.

[0017] By adopting the above technical solution, it can be ensured that the arc segment and the straight segment are always tangent, so that the junction of the arc segment and the straight segment is smooth and avoids sharp corners at positions other than the upper arc edge of the fan ring, thereby aggravating stress concentration.

[0018] According to one embodiment of this application, the notch has a pair of curved edges that extend gradually away from the rolled edge.

[0019] By adopting the above technical solution, the curved edge ensures that the cutting damage to the material fibers is reduced during the processing, and prevents the notch from expanding into micro-cracks when curling. This reduces stress concentration at the edge of the sealing section while improving structural integrity.

[0020] According to one embodiment of this application, two curved edges are tangent to form an arc-shaped notch.

[0021] By adopting the above technical solution, when the two curved edges are tangent, a smooth transition curve is formed at the deepest point of the arc-shaped notch, which minimizes the stress concentration coefficient in the rolled area at the sealing edge, disperses the stress peak, and avoids crack initiation.

[0022] According to one embodiment of this application, the notch has a pair of straight edges that extend gradually away from the rolled opening to form a triangular notch.

[0023] Using the above technical solution, the two straight edges efficiently guide the stress to be released along the straight line, avoiding the disorderly diffusion of stress when the fan blade is rolled. It is especially suitable for the sudden change in hardness caused by the double-layer structure of the edge sealing part. At the same time, the processing difficulty of the straight edges is the lowest, which can significantly reduce the production cost.

[0024] According to one embodiment of this application, the cup includes: a cup body formed by rolling and pressing a cup fan blade as described above; and a cup bottom disposed at the bottom of the cup body.

[0025] Using the above technical solution, the cup body is formed by rolling and pressing a cup fan blade with a notch. The rolled edge of the cup body is completely fitted, and the cup mouth has a regular shape, which can meet the design requirements of high curvature and small roll diameter. While ensuring the structural strength of the cup after molding, the sealing performance of the cup lid is improved, which meets the customer's high leak detection requirements. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a cup provided for one embodiment of this application; Figure 2 A first example of a cup fan blade in a cup according to the above embodiments of this application is shown; Figure 3 An enlarged schematic diagram of a portion A in a cup fan blade according to a first example of this application is shown; Figure 4 A second example of a cup fan blade from the above embodiments of this application is shown; Figure 5 An enlarged schematic diagram of a portion A in a cup fan blade according to a second example of this application is shown; Figure 6 A third example of a cup fan blade from the above embodiments of this application is shown; Figure 7 An enlarged schematic diagram of a portion A in a cup fan blade according to a first example of this application is shown.

[0028] Key reference numerals: 1. Cup fan blade; 10. Fan ring part; 11. Upper arc edge; 12. Lower arc edge; 13. Left edge; 14. Right edge; 20. Rolled mouth part; 30. Sealing edge part; 40. Notch; 41. First side; 42. Second side. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of the embodiments of this application, it should be noted that the terms "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0033] When disposable cups are molded under high curling requirements, defects such as cracking and irregular shape often appear at the rim. Technicians have found that the chamfer of the conventional cup fan blade is an oblique angle or a rounded angle. The rolled edge at the sealing edge has a double-layer structure after molding. Due to the sudden change in thickness and rigidity, concentrated stress is generated here, resulting in higher hardness and stronger resistance to deformation at the rim. This causes the rim of the cup to not be rolled properly, or even burst.

[0034] To address the aforementioned issues, this application provides a cup fan blade and a cup that can resolve the problem of insufficient sealing of the lid caused by defects in the rolled edge of a disposable cup.

[0035] Specifically, please refer to Figure 1The first embodiment of this application provides a cup, which may include a cup body formed by rolling and pressing a cup fan blade 1; and a cup bottom disposed at the bottom of the cup body.

[0036] For more details, please refer to Figures 2 to 7 An example of this application provides a fan blade 1 for a cup, which may include a fan ring portion 10 having an upper arc edge 11, a lower arc edge 12 arranged concentrically with the upper arc edge 11, a left edge 13 extending radially from the left end of the lower arc edge 12 to the left edge 11 of the upper arc edge 11, and a right edge 14 extending radially from the right end of the lower arc edge 12 to the right edge 11 of the upper arc edge 11; a rolled mouth portion 20 extending circumferentially along the upper arc edge 11 of the fan ring portion 10; and a sealing edge portion 30 extending radially along the left edge 13 or the right edge 14 of the fan ring portion 10 to the rolled mouth portion 20; the sealing edge portion 30 has a notch 40 adjacent to the rolled mouth portion 20, and the notch 40 extends gradually from the side of the sealing edge portion 30 away from the rolled mouth portion 20 toward the direction closer to the rolled mouth portion 20. The notch 40 interrupts the continuous stress transmission at the rolled edge of the sealing portion 30, allowing stress to be released outward along the edge of the notch, preventing excessive stress concentration in a single area. The notch 40 also transforms the triaxial tensile stress state generated during rolling into a biaxial stress state along the gradually expanding direction of the notch 40, reducing the difficulty of plastic deformation of the material. Simultaneously, the rolled edge at the notch 40 changes from being formed from two layers of material to being formed from a single layer, mitigating excessive stress concentration caused by abrupt changes in thickness and stiffness. With the reduced concentrated stress, the difficulty of rolling the sealing portion 30 decreases, thus preventing defects in the rolled edge after forming. This ensures the structural strength of the cup formed from the cup fan blade 1 while improving the seal when fitted with the lid. It is understandable that since the cup body is formed by rolling the cup fan blade 1, placing the notch 40 on the left or right side of the fan ring portion 10 achieves the same effect. It should be noted that the material of the cup fan blade 1 can be paper of varying thickness.

[0037] Optionally, such as Figure 3 , Figure 5 or Figure 7As shown, the minimum distance L between the notch 40 radially along the fan ring portion 10 and the upper edge of the sealing portion 30 is between 1.5mm and 7.5mm. When the minimum distance L is too small, the notch 40 is close to the upper edge of the rolled mouth portion 20, where the stress release space is too small, and the stress concentration is greater than when there is no notch 40, reducing the circumferential stiffness of the rolled mouth and easily leading to deformation or even breakage of the cup mouth after molding. When the minimum distance L is too large, the notch 40 cannot cover the stress concentration area. The notch 40 not only loses its function of reducing stress concentration, but also introduces additional concentrated stress, exacerbating the occurrence of rolled mouth defects. Therefore, reasonably controlling the minimum distance L between the notch 40 radially along the fan ring portion 10 and the upper edge of the sealing portion 30 can optimize the stress distribution and change the stress transmission path while ensuring the structural strength of the cup body after molding, thereby reducing the occurrence of defects such as irregular rolled mouth shape and bursting during the rolling and pressing process of the cup fan blade 1.

[0038] Optionally, such as Figure 3 , Figure 5 or Figure 7 As shown, the maximum width W of the notch 40 along the radial direction of the fan ring 10 is between 5mm and 16mm. When the maximum width W is too small, the width of the notch 40 along the radial direction of the fan ring 10 will be too small. At this time, the notch 40 cannot fully cover the stress concentration area of ​​the sealing edge 30 near the rolled edge 20, resulting in insufficient stress release. During the rolling process, micro-cracks are easily formed at the edge of the notch 40, leading to rolling failure. When the maximum width W is too large, the area covered by the notch 40 will extend beyond the rolled edge 20 towards the lower arc edge 12 of the fan ring 10. After the cup is rolled and pressed by the fan blade 1, a notch will appear on the cup body below the rolled edge. This not only affects the appearance but also reduces the sealing edge range near the rolled edge 20 in the height direction of the cup body, changing from a double-layer structure to a single-layer structure, reducing the sealing performance and structural strength, and resulting in insufficient load-bearing capacity.

[0039] Specifically, such as Figure 3 , Figure 5 or Figure 7As shown, the maximum depth of the notch 40 is between 1.6mm and 5.75mm. The depth direction of the notch 40 is along the width direction of the sealing portion 30. When the maximum depth D is too small, the notch 40 cut off along the width direction of the sealing portion 30 is too small. The stress chain at the rolled edge of the cup fan 1 is not broken during the rolling process. The concentrated stress is not only not greatly eliminated, but the notch 40 also introduces additional concentrated stress. This stress is prone to forming microcracks at the edge of the notch 40, leading to the appearance of rolling defects. When the maximum depth D is too large, although the concentrated stress at this location can be eliminated to the greatest extent, it will cause the sealing width W0 near the notch 40 to be too small, affecting the sealing quality at the notch 40, reducing the sealing performance of the sealed area of ​​the cup body after molding, and increasing the risk of liquid leakage. Controlling the maximum depth within a reasonable range can cut the stress transmission chain to the greatest extent, reduce the stress concentration at the rolled edge of the sealing portion 30, and simultaneously ensure the rolling quality and sealing quality.

[0040] Preferably, the deepest point of the notch 40 corresponds to the upper arc edge 11 of the fan ring portion 10. During the curling process, the location of the highest stress concentration is the upper arc edge 11 of the fan ring portion 10. By setting the deepest point of the notch 40 to correspond to the upper arc edge 11 of the fan ring portion 10, the notch 40 precisely covers the stress concentration point, reducing the stress peak. At the same time, during the curling process, the stress is released outward from the deepest point of the notch 40 along both sides of the notch 40, reducing the occurrence of bursts. It can be understood that if the deepest point of the notch 40 does not correspond to the upper arc edge 11 of the fan ring portion 10, the closer its position is to the upper arc edge 11, the better the stress reduction effect.

[0041] Specifically, please see Figure 3 In the first example of this application, the first side 41 of the notch 40 can be an arc edge, and the second side 42 can be a straight edge tangent to the arc edge. The tangent point of the first side 41 and the second side 42 is smoothly transitioned, avoiding the connection point of the two sides becoming a new stress concentration point. The notch 40 formed by the two sides releases the stress concentrated at the rolled edge of the sealing part 30 outward along the arc edge and the straight edge, reducing stress concentration at that point and improving the quality of the rolled edge.

[0042] It is worth noting that in the first example of this application, the cup fan blade 1 satisfies the following relationships: 5mm≤HL≤6mm; 0≤HW≤1; and 0.5≤W0 / 2-D≤1.5; where H is the curling height of the rolled mouth of the cup fan blade 1, W0 is the sealing width of the sealing edge 30 of the cup fan blade 1, L is the minimum distance between the notch along the radial direction of the fan ring 10 and the upper edge of the sealing edge 30, W is the maximum width of the notch 40 along the radial direction of the fan ring 10, and D is the maximum depth of the notch 40.

[0043] For example, when the curling height H is between 7 mm and 12 mm and the sealing width W0 is between 6 mm and 12 mm, the minimum distance L between the notch 40 and the edge of the sealing portion 30 along the radial direction of the fan ring portion 10 can be between 1 mm and 7 mm, the maximum width W of the notch 40 along the radial direction of the fan ring portion 10 can be between 6 mm and 12 mm, and the maximum depth D of the notch 40 can be between 1.5 mm and 5.5 mm.

[0044] For more details, please see Figure 3 In the first example described above in this application, the central angle of the curved edge can be greater than 90° and less than 180°; the center of the curved edge is located on the side of the sealing portion 30 facing away from the rolled edge portion 20. This ensures that the curved segment and the straight segment are always tangent, resulting in a smooth transition at the junction of the curved and straight segments. Otherwise, if the central angle of the curved edge is less than 90° or the center of the curved edge is outside the sealing portion 30, a sharp angle will be formed between the straight and curved segments, and this sharp angle will not correspond to the upper arc edge 11 of the fan ring portion 10. This causes the stress from the sharp angle to be unable to be released during the rolling process, exacerbating stress concentration.

[0045] Optionally, please see Figure 4 and Figure 5 In the second example of this application, the first edge 41 and the second edge 42 of the notch 40 are both curved edges, extending gradually away from the rolled edge 20. The processing of the curved edges, compared to the straight edges, reduces cutting damage to the material fibers and prevents microcracks from forming at the notch 40 during rolling, thus improving structural integrity while reducing stress concentration at the rolled edge of the sealing portion 30. It is understood that the connection point of the two curved edges can be tangent or only continuous in position. When the two curved edges are not tangent, a sharp angle is formed at their connection point, causing stress concentration and making the notch 40 prone to cracking.

[0046] Preferably, the two curved edges are tangent to each other, forming a smooth transition curve at the deepest point of the curved notch 40, which minimizes the stress concentration coefficient in the rolled edge area of ​​the sealing part 30, disperses the stress peak, and avoids crack initiation.

[0047] It is worth noting that in the second example of this application, the cup fan blade 1 satisfies the following relationships: 4≤HL≤5; W=H+43.5≤WH≤4.5; and D=W0 / 2-0.25-0.25≤W0 / 2-D≤0.75; where H is the curling height of the rolled mouth of the cup fan blade 1, W0 is the sealing width of the sealing edge 30 of the cup fan blade 1, L is the minimum distance between the notch along the radial direction of the fan ring 10 and the upper edge of the sealing edge 30, W is the maximum width of the notch along the radial direction of the fan ring 10, and D is the maximum depth of the notch.

[0048] For example, when the curling height H is between 7mm and 12mm and the sealing width W0 is between 6mm and 12mm, the minimum distance L between the notch 40 and the edge of the curling portion 20 along the radial direction can be between 2mm and 8mm, the maximum width W of the notch 40 along the radial direction of the curling portion 20 can be between 10.5mm and 16.5mm, and the maximum depth D of the notch 40 can be between 2.25mm and 6.25mm.

[0049] Optionally, please see Figure 6 and Figure 7 In the third example of this application, the first side 41 and the second side 42 of the notch 40 are both straight edges, and the two straight edges extend gradually away from the rolled edge 20 to form a triangular notch. The straight edges can efficiently guide stress release along a straight line, avoiding disordered stress diffusion of the fan blades when rolled, and are especially suitable for the sudden change in hardness caused by the double-layer structure of the sealing edge 30. At the same time, the straight edges have the lowest processing difficulty, which can significantly reduce production costs.

[0050] It is worth noting that in the third example of this application, the cup fan blade 1 satisfies the following relationships: 5≤HL≤6; W=H-10.5≤HW≤1.5; and D=W0 / 2-1.4 0.9≤W0 / 2-D≤1.9; where H is the curling height of the rolled mouth of the cup fan blade 1, W0 is the sealing width of the sealing edge 30 of the cup fan blade 1, L is the minimum distance between the notch along the radial direction of the fan ring 10 and the upper edge of the sealing edge 30, W is the maximum width of the notch along the radial direction of the fan ring 10, and D is the maximum depth of the notch 40.

[0051] For example, when the curling height H is between 7mm and 12mm and the sealing width W0 is between 6mm and 12mm, the minimum distance L between the notch 40 and the edge of the curling portion 20 along the radial direction can be between 1mm and 7mm, the maximum width W of the notch 40 along the radial direction of the curling portion 20 can be between 5.5mm and 11.5mm, and the maximum depth D of the notch 40 can be between 1.1mm and 5.1mm.

[0052] In summary, the notch 40 on the cup fan blade 1 of this application can effectively reduce the bending stress on the material edge during the rolling and pressing process of the cup fan blade 1, ensuring that the rolled edge of the cup body is completely fitted after molding and that the cup mouth shape is regular. This meets the design requirements of high curvature and small roll diameter, improves the sealing performance of the cup lid while maintaining the structural strength and circumferential stiffness of the cup mouth after molding, improves the comfort of use, enhances the aesthetics of the cup mouth, and meets the customer's high leak detection requirements.

[0053] The technical features of the above embodiments can be combined without changing the basic principles of this application. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A fan-shaped blade for a cup, characterized in that, include: The fan-shaped ring portion has an upper arc edge, a lower arc edge arranged concentrically with the upper arc edge, an edge extending radially from the left end of the lower arc edge to the left edge of the upper arc edge, and an edge extending radially from the right end of the lower arc edge to the right edge of the upper arc edge. A rolled-up portion, the rolled-up portion extending circumferentially along the upper arc edge of the fan-shaped portion; as well as The edge sealing portion extends radially along the left or right edge of the fan ring portion to the rolled opening portion; the edge sealing portion has a notch adjacent to the rolled opening portion, the notch extending gradually from the side of the edge sealing portion away from the rolled opening portion toward the direction close to the rolled opening portion.

2. The cup fan blade according to claim 1, characterized in that, The minimum distance between the notch along the radial direction of the fan ring and the upper edge of the sealing edge is between 1 mm and 8 mm.

3. The cup fan blade according to claim 2, characterized in that, The maximum width of the notch along the radial direction of the fan ring is between 4.5 mm and 16.5 mm.

4. The cup fan blade according to claim 3, characterized in that, The maximum depth of the notch is between 1.1 mm and 6.25 mm.

5. The cup fan blade according to claim 4, characterized in that, The deepest part of the notch corresponds to the upper arc edge of the fan ring.

6. The cup fan blade according to any one of claims 1 to 5, characterized in that, The notch has an arc-shaped side and a straight side tangent to the arc-shaped side.

7. The cup fan blade according to claim 6, characterized in that, The central angle of the arc edge is greater than 90° and less than 180°; the center of the arc edge is located on the side of the sealing portion facing away from the rolled opening portion.

8. The cup fan blade according to any one of claims 1 to 5, characterized in that, The notch has a pair of curved edges, which extend gradually away from the rolled opening.

9. The cup fan blade according to claim 8, characterized in that, The two curved sides are tangent to form an arc-shaped notch.

10. The cup fan blade according to any one of claims 1 to 5, characterized in that, The notch has a pair of straight sides that extend gradually away from the rolled opening to form a triangular notch.

11. A cup, characterized in that it includes: The cup body is formed by rolling and pressing a cup fan blade as described in any one of claims 1 to 10; and The cup bottom is located at the bottom of the cup body.

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