Low-crease paper cup structure

Abstract

The invention belongs to the technical field of paper containers, and discloses a low-crease paper cup structure which comprises a cup body component and a bottom component, the cup body component comprises a cup body part, the lower end of the cup body part is turned inwards to form an upturning part, and the bottom component comprises a bottom surface part and a bent part formed by bending the outer periphery of the bottom surface part. The bent part is clamped between the cup body part and the upturning part so as to be jointed with each other, and the bent part is formed by a plurality of sections of bonding parts which are distributed in the circumferential direction and supporting parts with larger widths in an alternating manner. Through the structure, the obvious degree of creases can be reduced, the bottom component is prevented from being torn during demolding, the joint stability is enhanced, the stress dispersion is optimized, and the stability of the hot drink cup and the stacking and taking convenience are also considered.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of paper containers, and particularly relates to a low-crease paper cup structure. BACKGROUND

[0002] Traditional paper cups are usually formed by bonding a circular cup bottom and a conical cup body through a curling process. In the manufacturing process, the edge of the cup body bottom is bent inward and bonded with the cup bottom.

[0003] The taper of the cup body directly affects the performance of the paper cup. A moderate taper allows the paper cup to be nested and stacked, saving storage and transportation space. A large taper (a steep cup body) is prone to tipping. A gentle taper is suitable for hot drink cups that require high stability. When the taper is too small, the cup body is interference fit, making it difficult to nest and stack the cup bodies, and the cup is not easy to pull out. In order to improve the user experience, the stacking efficiency and quick access are preferred, and the cup bottom depth is usually made deep.

[0004] However, during the bending process of the circular cup bottom, the material will be compressed in the circumferential direction, generating circumferential compressive stress. The material releases stress by forming wrinkles, which eventually appear as visible periodic wrinkles. When the cup bottom depth is made deep, the material wrinkles in the joint area are more obvious, and the material is prone to accumulate, resulting in an increase in the thickness of the bonding surface. This not only causes uneven distribution of bonding energy and a decrease in bonding strength, leading to cup bottom flatness out-of-tolerance, directly affecting the sealing performance of the paper cup, but also causes the bottom member 2 to be stuck (see FIG. 2) with the inner wall of the bending mold 3, causing the bottom member 2 to tear. Figure 8 SUMMARY

[0005] The present application aims to solve the above-mentioned problems of the prior art and provides a low-crease paper cup structure.

[0006] The purpose of the present application can be achieved by the following technical solution: a low-crease paper cup structure, comprising a cup body member and a bottom member, the cup body member comprising a cup body part, the lower end of the cup body part being turned inward to form an upward part, the bottom member comprising a bottom surface part and a curved part formed by bending the outer periphery of the bottom surface part, the curved part being clamped between the cup body part and the upward part to be mutually bonded, the curved part comprising a plurality of circumferentially distributed bonding parts and a support part for connecting adjacent bonding parts and having a width greater than the bonding part, the bonding part and the support part being integrally cut and formed.

[0007] Preferably, the support part can abut the folding part formed between the cup body part and the upward part.

[0008] Preferably, the edge of the bonding part is linear or inwardly curved in an arc shape.

[0009] Preferably, the support part is a point, a plane, or an arc surface.​

[0010] As preferred, the plurality of said adhesive portions are evenly distributed circumferentially along the bottom portion.

[0011] As preferred, the number of said adhesive portions is 6 or 8.

[0012] As preferred, the widest part of said curved portion is greater than or equal to 8mm.

[0013] As preferred, the upper end of said cup body portion is curved to form a curled portion in the shape of a ring.

[0014] Compared with the prior art, the present application has the following advantages: 1. Reducing the degree of crease visibility, by dividing the curved portion of the bottom member into an alternating structure of adhesive portions and wide support portions, the adhesive portions assume the function of adhesion, and the support portions form local stiffness reinforcement zones by increasing the sectional moment of inertia to inhibit buckling deformation, so that the creases on the adhesive portions are more concealed; 2. Avoiding tearing, effectively reducing material accumulation in the adhesive portion area, so that the adhesive portion bears the ejection force more evenly when demoulding, and tearing caused by frictional drag with the inner wall of the bending mould is avoided; 3. Enhancing the stability of the joint, the support portions not only connect adjacent adhesive portions, but also tightly abut the folded parts between the cup body portion and the upturned portion, thereby providing additional support force for the bottom member and enhancing the stability of the joint between the bottom member and the cup body member; 4. Optimizing stress dispersion, the linear or arc-shaped edges of the adhesive portions can both achieve effective stress dispersion; 5. Balancing stability and stacking efficiency, increasing the width of the curved portion and deepening the cup bottom, which improves the stability of the hot beverage cup, and also improves the stacking efficiency and convenience of use. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic view of the mounting and cooperation structure of the bottom member and the cup body member of the present application.

[0016] Figure 2 is a schematic view of the overall cross-sectional structure of the present application.

[0017] Figure 3 is a schematic view of the cross section during the assembly of the bottom member and the cup body member.

[0018] Figure 4 is Figure 2 is a schematic view of the enlarged structure at position A in FIG.

[0019] Figure 5 is a schematic view of the structure of the first embodiment of the bottom member.

[0020] Figure 6 is Figure 5 is a schematic view of the structure of the three embodiments of the structure at position B in FIG.

[0021] Figure 7 is a structural schematic diagram of a bottom member embodiment two.

[0022] Figure 8 is a bending processing schematic diagram of a bottom member.

[0023] Figure 9 is an actual application effect diagram of a bottom member.

[0024] In the figure, 1, cup body member; 11, cup body part; 12, upward turning part; 13, curling part; 2, bottom member; 21, bottom surface part; 22, bending part; 22a, bonding part; 22b, supporting part; 3, bending mold. DETAILED DESCRIPTION

[0025] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in combination with the accompanying drawings, but the present application is not limited to these embodiments.

[0026] As Figures 1-4 shown, the embodiment provides a low-crease paper cup structure, which comprises a cup body member 1 and a bottom member 2, the cup body member 1 comprises a cup body part 11, the lower end of the cup body part 11 is inwardly turned to form an upward turning part 12, the bottom member 2 comprises a bottom surface part 21 and a bending part 22 formed by bending the outer periphery of the bottom surface part 21, the bending part 22 is clamped between the cup body part 11 and the upward turning part 12 to be mutually engaged, the bending part 22 comprises a plurality of circumferentially distributed bonding parts 22a and a supporting part 22b for connecting adjacent bonding parts 22a and having a width greater than that of the bonding parts 22a, the bonding parts 22a and the supporting part 22b are integrally cut and formed.

[0027] Compared with the traditional paper cup structure, the low-crease paper cup structure provided by the embodiment optimizes the design of the bottom member 2, divides the traditional bending part 22 region into an alternating structure of a plurality of bonding parts 22a and wide supporting parts 22b, the width of the bonding part 22a is relatively narrow, mainly undertakes the bonding function, the local compression stress is concentrated in this area, and the resulting creases are also embodied in this area. The width of the supporting part 22b is significantly increased, the bending stiffness is proportional to the square of the width by increasing the sectional moment of inertia, a local stiffness reinforcement area is formed to suppress buckling deformation. Therefore, the creases embodied on the bonding part 22a become more concealed, the material accumulation in this area is effectively reduced, the bonding part 22a bears the ejection force more evenly when demolding, and tearing caused by friction and dragging with the inner wall of the bending mold 3 is avoided.

[0028] Further, the supporting part 22b can abut against the folded part formed between the cup body part 11 and the upward turning part 12.

[0029] The support portion 22b not only connects adjacent adhesive portions 22a, but also closely abuts against the folded portion formed between the cup body portion 11 and the upward-folding portion 12. On the one hand, the support portion 22b has a connecting function, ensuring the continuity and stability between adhesive portions 22a; on the other hand, by abutting against the folded portion, it provides additional support to the bottom member 2, further enhancing the stability of the connection between the bottom member 2 and the cup body member 1.

[0030] The following is the processing method for this low-crease paper cup structure: Material selection: Choose paperboard blanks that meet food-grade standards to ensure the safety of the inner waterproof material and the outer printing ink; For the processing of cup body component 1, the cardboard blank is coated with film, and after the coating process, the paper is die-cut into fan-shaped cup pieces; The bottom component 2 is processed by coating the cardboard blank and then die-cutting the coated paper. During die-cutting, an adhesive part 22a and a support part 22b are added to the curved part 22. The stress distribution is optimized by adjusting the width. like Figure 9 The image shown is a rendering of the actual processing and application of the bottom component.

[0031] Assembly, such as Figure 3 As shown in (a), the fan-shaped cup sheet is rolled into a cylindrical cup body 11, and the bottom of the cup body 11 is flipped over to form an upward-facing part 12, as shown. Figure 8 As shown, the outer periphery of the bottom part 21 of the bottom component 2 is bent by the bending mold 3 to form a bent part 22, so that the bent part 22 faces downward and pushes the bottom component 2 towards the bottom of the cup body component 1, as shown. Figure 3 As shown in (b), the curved portion 22 is finally sandwiched between the cup body portion 11 and the upturned portion 12, and the cup body component 1 and the bottom component 2 are joined together by heating and pressing with a molding machine.

[0032] In this embodiment, as Figure 5 As shown in (a), the edge of the adhesive portion 22a is straight; as Figure 5 As shown in (b), the edge of the adhesive portion 22a is an inwardly curved arc shape.

[0033] The turning point formed by the straight edge divides the stress path into discrete directions, forcing the stress to redistribute between adjacent support parts 22b, similar to the function of a "truss node"; the edge of the adhesive part 22a is an inwardly curved arc, which makes the width of the adhesive part 22a significantly lower than that of the support part 22b, making the creases more concealed. It is worth mentioning that it is necessary to ensure that the adhesive part 22a has sufficient width to bond with the cup body part 11.

[0034] Furthermore, such as Figure 6 As shown in (a), the support portion 22b is a point; asFigure 6 (b) shows that the support part 22b is a plane; as Figure 6 (c) shows that the support part 22b is a curved surface.

[0035] In this embodiment, the support part 22b is in a discrete point structure, which converts the vertical pressure into multiple concentrated load points, improves the compression efficiency, and reduces the amount of paper material; The support part 22b is a plane structure, which provides uniform distribution of positive pressure, reduces the unit area pressure, avoids the risk of local puncture, and reduces the edge stress concentration; the support part 22b is a curved surface structure, which can form a reverse curvature connection point with the curved edge of the bonding part 22a, allowing the bonding part 22a to deform controllably, and further improving the anti-wrinkling efficiency of the curved part 22.

[0036] Further, as shown in Figure 3 , Figure 5 , Figure 7 The bonding part 22a is uniformly distributed along the circumferential direction of the bottom part 21.

[0037] The uniformly distributed bonding part 22a forms a periodic gap array with the inner wall of the cup body part 11, and the support part 22b is bonded to the cup body by high-frequency heat pressing. The uniform gap design makes the adhesive layer flow uniformly during heat pressing, avoiding local glue overflow or lack of glue. The circumferential uniform distribution makes the compression stress transmission path symmetric in all directions, avoiding eccentric load caused by uneven distribution, and each bonding part 22a bears the same proportion of lateral pressure.

[0038] Further, the number of bonding parts 22a is 6 or 8. Six uniformly distributed bonding parts 22a form a honeycomb structure, and the vertical load is uniformly dispersed through six groups of support parts 22b, reducing the risk of lateral deformation; the number of bonding parts 22a is 8, forming a high-density support array to improve the support strength.

[0039] Further, the widest part of the curved part 22 is greater than or equal to 8 mm. Through repeated tests, it is found that when the cup body taper is too small, the interference fit of the cup body is enhanced, and the widest part of the curved part 22 is designed to be greater than or equal to 8 mm, which deepens the cup bottom and makes the cup bottom diameter much smaller than the cup mouth diameter, improving the stability of the hot drink cup and the stacking efficiency, and facilitating quick access.

[0040] Further, the upper end of the cup body part 11 is curved to form a ring-shaped curling part 13. The ring-shaped curling part 13 can act as a reinforcing rib to improve the strength of the cup mouth, reduce the risk of tearing during use and assembly with the bottom member 2, and prevent the mouth from being cut when drinking.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the application. Various modifications or changes in the specific embodiments described herein can occur to those skilled in the art to which the application pertains without departing from the spirit of the application, and it is understood that such modifications or changes are to be considered as within the scope of the application as defined by the appended claims.

Claims

1. A low-crease paper cup structure, comprising a cup body component (1) and a bottom component (2), wherein the cup body component (1) includes a cup body portion (11), the lower end of the cup body portion (11) being turned inward to form an upturned portion (12), and the bottom component (2) includes a bottom surface portion (21) and a curved portion (22) formed by bending the outer periphery of the bottom surface portion (21), the curved portion (22) being sandwiched between the cup body portion (11) and the upturned portion (12) for mutual engagement, characterized in that, The curved portion (22) includes multiple circumferentially distributed adhesive portions (22a) and a support portion (22b) for connecting adjacent adhesive portions (22a) and having a width greater than the adhesive portion (22a). The adhesive portions (22a) and the support portion (22b) are integrally cut and formed.

2. The low-crease paper cup structure according to claim 1, characterized in that, The support (22b) can abut against the folded portion formed between the cup body (11) and the upturned portion (12).

3. A low-crease paper cup structure according to claim 1 or 2, characterized in that, The edge of the adhesive portion (22a) is either straight or curved inward.

4. The low-crease paper cup structure according to claim 3, characterized in that, The support part (22b) can be a point, a plane, or an arc surface.

5. A low-crease paper cup structure according to claim 1, 2, or 4, characterized in that, The multiple adhesive portions (22a) are evenly distributed circumferentially along the bottom portion (21).

6. The low-crease paper cup structure according to claim 5, characterized in that, The number of adhesive portions (22a) is 6 or 8.

7. A low-crease paper cup structure according to claim 1, 2, or 4, characterized in that, The widest part of the curved portion (22) is greater than or equal to 8 mm.

8. A low-crease paper cup structure according to claim 1, 2, 4, or 6, characterized in that, The upper end of the cup body (11) is bent to form a ring-shaped curled portion (13).

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