Corrugated paper cup

Abstract

The corrugated paper cup includes a cup body formed by winding a fan-shaped sheet (11). The fan-shaped sheet (11) includes an inner cup paper (2) and a single-layer corrugated paper (3) attached to the outer peripheral surface of the inner cup paper (2). By shifting and parallelizing the first end (31) of the corrugated paper and the first end (21) of the inner cup paper, the first hypotenuse (111) of the fan-shaped sheet (11) is formed, and the second end (32) of the corrugated paper and the second end (22) of the inner cup paper are aligned to form the second hypotenuse (112) of the fan-shaped sheet (11). The waveform after the expansion of the fan-shaped sheet (11) is a horizontal stripe whose stripe direction is from the first hypotenuse (111) to the second hypotenuse (112). When the fan-shaped sheet (11) is wound to form a sealed edge, the second hypotenuse (112) and the first hypotenuse (111) of the fan-shaped sheet (11) are laminated to form a sealed edge region (4) where at least three layers of paper are closely attached. The thickness formed after the waveform cavity region close to the upper arc edge in the fan-shaped sheet (11) is flattened is smaller than the thickness of the middle part of the fan-shaped sheet (11). And a curl (51) is formed by winding a part of the pressed waveform cavity region together with the inner cup paper (2) to the outside. The paper cup has horizontal stripes with the stripe direction of the waveform from the first hypotenuse to the second hypotenuse. Thereby, firstly, it has an anti-burn effect. Secondly, by making the stripes provided in the horizontal direction, the outer shape after winding becomes a stripe with a helix facing upward, so that an annular-like support structure is formed and the structural strength is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of paper cups, relates to paper cups, and particularly relates to a two-layer corrugated paper cup adaptable to unmanned fully automatic manufacturing.

Background Art

[0002] With the increasing awareness of environmental protection among people, paper cups are becoming increasingly popular as daily necessities replacing plastic cups and have become daily necessities at home, in restaurants, and in offices. For example, corrugated paper cups with heat insulation and fire prevention functions are relatively popular paper cup products. However, in order to provide a corrugated paper cup structure applicable to an unmanned automatic production line, it is necessary to solve technical problems.

[0003] Conventional corrugated paper cups mainly have two types of structures. The first structure is one in which a corrugated paper sleeve is put on the outside of an inner paper cup. Since a single-layer corrugated object expands, it cannot maintain the gaps between the waves. Therefore, in order to maintain the gaps between the waves of the corrugated paper sleeve and exert a fire prevention effect, this type of corrugated paper sleeve is first formed by attaching a corrugated single-layer corrugated object onto a non-expandable liner. Then, when the corrugated paper sleeve is coated and adhered to the outside of the paper cup, the liner of the corrugated paper sleeve and the paper cup are adhered and fixed. This type of corrugated paper cup can realize unmanned automatic manufacturing throughout the entire process. After the inner paper cup and the corrugated paper sleeve are automatically manufactured separately, they are integrally coated and adhered by a coating and adhering machine. However, this type of corrugated paper cup has a thick structure and wastes some paper due to the presence of corrugated objects and liners. Also, since the manufacturing process is divided, more process equipment is required and the process becomes longer.

[0004] The second structure has a single-layer corrugated paper built between the inner paper and the outer paper. By being supported by the single-layer corrugated material, a heat insulation gap is formed between the inner paper and the outer paper, and sufficient paper strength is provided. Then, the inner paper, the corrugated paper, and the outer paper are made into a fan-shaped sheet, and both sides of the fan-shaped sheet are adhesively attached in a sealed manner to form a sealing side. Also, the cup mouth is curled. However, since the corrugated paper expands and contracts and has wave gaps that occupy a large space, it is difficult to achieve a state where it is sealed and does not leak water during side sealing. Therefore, during side sealing, the wavy corrugated paper is excluded from the sealing side structure. Also, when curling the cup mouth, since the corrugated paper is difficult to roll, the wavy corrugated paper is excluded from the curl. Therefore, this type of corrugated paper cup with this structure has a very high difficulty in realizing unmanned automatic manufacturing. This is because it is difficult to process the wavy material during both side sealing and curling.

Summary of the Invention

Problems to be Solved by the Invention

[0005] To apply unmanned automatic manufacturing, a simplified corrugated paper cup is provided.

Means for Solving the Problems

[0006] The object of the present invention can be realized by the following technical means.

[0007] A corrugated paper cup including a cup body formed by curling a fan-shaped sheet, wherein the fan-shaped sheet includes an inner cup paper and a single-layer corrugated paper attached to the outer peripheral surface of the inner cup paper, is characterized by the following. The thickness of the inner cup paper is greater than that of the corrugated paper, By shifting and paralleling the first ends of the corrugated paper and the inner cup paper, the first hypotenuse of the fan-shaped sheet is formed, and the second ends of the corrugated paper and the inner cup paper are aligned to form the second hypotenuse of the fan-shaped sheet. The waveform after the unfolding of the fan-shaped sheet is a horizontal stripe whose stripe direction is from the first hypotenuse to the second hypotenuse. When the fan-shaped sheet is wound to form a sealed sealing edge, the second hypotenuse and the first hypotenuse of the fan-shaped sheet are laminated, and a sealing edge region where at least three layers of paper are closely adhered and pasted is formed. After the waveform cavity region close to the upper arc edge in the fan-shaped sheet is flattened a curl region is formed, and in the curl region, a part is wound outward together with the inner cup paper to form a curl, and the remaining part is pressed to form the cup wall of the cup body, and the cup wall of this part The thickness is smaller than the thickness of the middle part of the fan-shaped sheet.

[0008] As an improvement, the corrugated paper and the inner cup paper at the upper arc edge and the lower arc edge of the fan-shaped sheet are aligned. The thickness formed after the waveform cavity region close to the lower arc edge in the fan-shaped sheet is flattened is smaller than the thickness of the middle part of the fan-shaped sheet. Moreover, a part of the pressed waveform cavity region bends inward together with the inner cup paper to form a cup bottom leg.

[0009] In this means, since the single-layer waveform is directly pasted on the inner cup paper, the structure of the cup body becomes simple. Also, with the structural design that the inner cup paper and the corrugated paper on the first hypotenuse are separated, and by using a waterproof material for the inner cup paper, the main body can be sealed completely depending on the adhesive part of the inner cup paper, and water leakage is prevented. Based on this, in this means, the stripe direction of the waveform is a horizontal stripe from the first hypotenuse to the second hypotenuse. Thereby, first, it has an anti-burn effect. Second, by making the stripes provided in the horizontal direction, the outer shape after being wound becomes a stripe pattern, so an annular-like support structure is formed and the structural strength is enhanced uses a two-layer structure with a thick inner side and a thin outer side, so that the rigidity of the paper cup is guaranteed and the connection strength of the paper cup is enhanced. Also, since the flattened waveforms are involved in the cup mouth and the cup bottom, the curl and the strength of the cup bottom are enhanced. Also, the second hypotenuse and the first hypotenuse of the fan-shaped sheet are laminated, and a sealing edge region where at least three layers of paper are closely adhered and pasted is formed. Moreover, by flattening the sealing edge region, a structure corresponding to a support beam is formed. The paper cup has a higher overall strength than a normal two-layer paper cup.

[0010] Next, when manufacturing the paper for forming the waveform, as the paper is pulled forward by the roller, the paper is stretched in the longitudinal direction during the forward traction under the influence of the arrangement of fine fibers and the pulling force due to the traction, and its extensibility becomes small. Therefore, a transverse corrugated waveform perpendicular to the forward traction direction of the paper is pressed onto the paper. That is, the direction of the corrugation of the waveform after unfolding the fan-shaped sheet is a transverse corrugation from the first hypotenuse to the second hypotenuse. Moreover, the first end of the corrugated paper and the first end of the inner cup paper are shifted in parallel. By forming such a transverse corrugation with such a structure and pressing such a transverse corrugation flat and winding it into a curl, not only can the strength of the curl be enhanced, but also the occurrence of curl cracking can be eliminated. This is because a certain extensibility of the paper is required during curling, while the corrugation that is transverse and pressed meets the extensibility requirement. The corrugated waveform of the transverse corrugation is not stretched in the transverse direction and has a certain extensibility. Therefore, the structural requirement of simplifying the structure and adapting it to unmanned manufacturing is realized, and the structural strength is also improved.

[0011] In the above corrugated paper cup, after the area near the upper arc side or the area near the lower arc side in the fan-shaped sheet is pressed flat, the flattened waveform forms a fold and is wound into a curl or the cup bottom leg.

[0012] In the above corrugated paper cup, the waveform of the corrugated paper is a straight-line corrugated waveform, and the direction of the straight-line corrugation is perpendicular to the first hypotenuse.

[0013] In the above corrugated paper cup, the waveform of the corrugated paper is a transverse wavy corrugation from the first hypotenuse to the second hypotenuse.

[0014] In the above corrugated paper cup, the waveform of the corrugated paper is discontinuous waveform cavities distributed in the transverse direction from the first hypotenuse to the second hypotenuse, including round dot-shaped waveform cavities or rectangular waveform cavities.

[0015] In the above corrugated paper cup, the first hypotenuse of the fan-shaped sheet has an inner cup paper area not covered by the corrugated paper, and this area serves as the bonding part. When the second end of the inner cup paper is attached to the outer surface of the first end of the corrugated paper, the sealing edge area includes a four-layer reinforcement structure formed by the second end of the corrugated paper, the second end of the inner cup paper, the first end of the corrugated paper, and the first end of the inner cup paper, and a three-layer watertight structure formed by the second end of the corrugated paper, the second end of the inner cup paper, and the bonding part. According to such a hanging connection method, when curling and forming, since the bonding part and the inner cup paper are involved in forming a curl in the curled part, the sealing of the bonding location of the curl becomes more stable. Moreover, by curling, the connection strength of the sealing edge in the curled area is enhanced, so the connection at both ends of the paper cup is more stably sealed and separation is less likely to occur.

[0016] As an alternative means, when the second end of the inner cup paper is attached only to the bonding part, the first end and the second end of the corrugated paper are aligned with each other or maintain a gap. Also, the sealing edge area includes a three-layer watertight structure formed by the second end of the corrugated paper, the second end of the inner cup paper, and the bonding part. In this case, the strengthening effect is reduced, but since they are rolled into the curl together after pressing the waveform, the strength can still be enhanced.

[0017] In the above corrugated paper cup, a waterproof layer is provided on the inner wall of the inner cup paper. When the bonding part is hooked on the inner surface of the second end of the inner cup paper to form a sealed attachment and connection, one end of the waterproof layer is connected to the main body of the waterproof layer. By connecting one end of the waterproof layer to the main body of the waterproof layer, water leakage from between the bonding part and the second end of the inner cup paper is prevented. Also, in the hooking area, the end face of the first end of the corrugated paper abuts against the waterproof layer, further enhancing the sealing performance of the hooking area.

[0018] In the above corrugated paper cup, an adhesive layer is formed between the corrugated paper and the inner cup paper. Also, in the hooking area, by one end of the adhesive layer abutting against the waterproof layer, the sealing performance and connection strength of the hooking area are improved.

[0019] In the above corrugated paper cup, the paper cup further includes a cup bottom. An adhesive layer is provided on the cup bottom. By pressing the lower arc side of the fan-shaped sheet, a bending region is formed, and by bending the end of the bending region inward, a folding layer is formed. The adhesive layer is adhesively attached in a sealed manner between the bending region and the folding layer. The folding layer also provides connection strength to the adhesive part and the second end of the inner cup paper.

Advantages of the Invention

[0020] 1. The two-layer paper cup uses a two-layer structure with a thick inner layer and a thin outer layer. Also, for the sealing edge structure, a sealing edge where the inner cup paper and the corrugated paper are separated is used, so it completely depends on the sealed sealing edge of the inner cup paper. For such a sealing edge structure, a method of adhering at least three layers is used, and a thick sealing edge is changed by pressing. As a result, the thickness of the curl region existing in the sealing edge region decreases, making it suitable for the automation of curling by machinery. Also, due to the at least three-layer sealing edge structure, the paper cup can obtain sufficient support force, so the strength of the paper cup is maintained, and the cup wall formed in the curl region will not be deformed or bent.

[0021] 2. Since the at least three-layer sealing edge structure is laminated in an intersecting manner, a good pasting effect can be formed after edge sealing, and tearing and peeling are less likely to occur in the sealing edge region. Moreover, by pressing and curling, the effect of preventing tearing and peeling is further enhanced.

[0022] 3. When using corrugated paper with a corrugated structure, by pressing the corrugations, folds are formed in the hollow parts of the corrugations. These folds strengthen the curl region by creases or the overlap of multiple layers, so good strength can be formed after curling.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0024] The following are specific embodiments of the present invention, and in combination with the drawings, the technical means of the present invention will be further described. However, the present invention is not limited to these embodiments.

Examples

[0025] As shown in FIGS. 1 and 5, the paper cup 1 has a hollow cup body structure with a flared mouth, and includes a cup body formed by winding a fan-shaped sheet 11. The fan-shaped sheet 11 includes a first hypotenuse 111, a second hypotenuse 112, an upper arc side 113, and a lower arc side 114. The first hypotenuse 111 and the second hypotenuse 112 are attached to each other to form a sealed side region 4. The paper cup 1 further includes a curl 51 and a cup bottom 6. The outer surface of the cup body is wavy, and the wavy structure serves to prevent slipping and burns. Also, since the wavy structure is joined at the sealed side region 4 of the paper cup 1, the structural strength of the paper cup 1 is enhanced.

[0026] As shown in FIG. 2, the cup body, from the inside to the outside, sequentially consists of a waterproof layer 8, an inner cup paper 2, an adhesive layer 9, and a corrugated paper 3. The thickness of the inner cup paper 2 is greater than the thickness of the corrugated paper 3. Therefore, the inner cup paper 2 becomes the main load-bearing structure. The inner cup paper 2 can ensure the rigidity of the paper cup 1 and enhance the connection strength of the paper cup 1. The corrugated paper 3 has a horizontal stripe wavy structure. The concave portions in the wavy structure of the corrugated paper 3 are attached to the inner cup paper 2 via the adhesive layer 9. The upper part of the paper cup 1 is a curl region 5, and the lower part of the paper cup 1 is a bending region 7. The thickness of the curl region 5 is smaller than the thickness of the cup body. Also, the upper part of the curl region 5 is wound to form a curl 51. The curl 51 is convenient for strengthening the strength of the cup mouth and makes it easier to drink water.

[0027] Specifically, as shown in FIG. 3, an adhesive layer 62 is provided on the cup bottom 6. The bending region 7 is obtained by pressing the cup body. Also, by bending the end of the bending region 7, a folding layer 71 is formed. By arranging and attaching the adhesive layer 62 between the bending region 7 and the folding layer 71 for sticking and fixing, the cup bottom 6 is fixed to the main body of the paper cup 1. Since the adhesive layer 62 is located between the bending region 7 and the folding layer 71, the cup bottom 6 receives a supporting effect. Thereby, the connection between the cup bottom 6 and the main body of the paper cup 1 becomes more stable. Also, the sealing performance between the cup bottom 6 and the main body of the paper cup 1 becomes better, and it is less likely to leak water.

[0028] As shown in FIG. 4, the curled region 5 is obtained by pressing the cup body. Further, in the curled region 5, the end portion is curled to form a curl 51, and the remaining portion becomes the cup wall 52 of the cup body after pressing. Since the cup wall 52 of the above portion is composed of a plurality of layers laminated together, it also has sufficient strength.

[0029] FIG. 5 shows the sector sheet 11. When the formed paper cup is disassembled and the cup body portion is unfolded, it becomes a sector sheet. The sector sheet is cut out from the sheet shown in FIG. 11. Specifically, it is as follows. A linear stripe waveform is pressed on the paper 3. The direction of the linear stripes is perpendicular to the pulling direction of the paper. Next, the edges of the single-layer corrugated paper 3 and the inner cup paper 2 are shifted and arranged in parallel, and these are pasted and laminated by two composite rollers. Then, the first end 21 of the inner cup paper is cut out to form the first hypotenuse 111 of the sector sheet 11, and the second hypotenuse 112, the upper arc side 113, and the lower arc side 114 are cut out together with the first hypotenuse 111 to form the sector sheet 11 shown by the solid line portion in FIG. 11. According to such a method, unmanned automated manufacturing can be realized. That is, as shown in FIGS. 5 and 6, the corrugated paper 3 has a single-layer and linerless corrugated structure. Also, the waveform of the corrugated paper is a linear stripe waveform, and the direction of the linear stripes is perpendicular to the first hypotenuse 111. Therefore, the waveform of the horizontal stripes is not stretched in the horizontal direction and also has a certain extensibility. Thereby, the structural requirement of simplifying the structure to adapt to unmanned manufacturing is realized. Also, as an alternative means, when the waveform of the corrugated paper is a horizontally wavy stripe from the first hypotenuse to the second hypotenuse, the extensibility requirement is also satisfied. Alternatively, instead, discontinuous waveform cavities distributed in the horizontal direction are provided. The waveform cavities include round dot-shaped waveform cavities or rectangular waveform cavities.

[0030] The single-layer corrugated paper 3 is pasted on the outer peripheral surface of the fan-shaped inner cup paper 2. The length of the fan shape of the inner cup paper 2 is larger than the length of the fan shape of the corrugated paper 3. Moreover, the first end 31 of the corrugated paper and the first end 21 of the inner cup paper are offset and parallel. Thereby, the first hypotenuse 111 of the fan-shaped sheet 11 has an area of the inner cup paper not covered by the corrugated paper, and this area becomes the bonding part 211. Also, the corrugated paper 3 and the inner cup paper 2 at the second hypotenuse 112, the upper arc side 113, and the lower arc side 114 of the fan-shaped sheet are aligned. Then, by pressing the upper arc side 113 part, the curl region 5 is formed, and by pressing the lower arc side 114 part, the bending region 7 is formed.

[0031] The state of Fig. 5 is obtained from Fig. 6 and Fig. 9. Fig. 6 shows the multi-layer structure of the cup body. The multi-layers are, respectively, the waterproof layer 8, the inner cup paper 2, and the corrugated paper 3. Among them, the waterproof layer 8 is located inside the paper cup 1. The waterproof layer 8 has viscosity and is pasted and fixed to the inner cup paper 2. The waterproof layer 8 and the inner cup paper 2 have the same shape and size. Therefore, after the paper cup 1 is folded and formed, the inner walls of the paper cup 1 are all covered by the waterproof layer 8, so the sealing performance of the paper cup 1 is guaranteed. As shown in Fig. 9, when the fan-shaped sheet 11 is wound and butted from the state of Fig. 6, the sealing edge region 4 shown in Fig. 9 is formed. Specifically, the first end 31 of the corrugated paper and the second end 32 of the corrugated paper are hooked. And the hooking position is offset from the bonding part 211. The sealing edge region 4 is a four-layer reinforced structure formed by the second end 32 of the corrugated paper, the second end 22 of the inner cup paper, the first end 31 of the corrugated paper and the first end 21 of the inner cup paper, and a three-layer watertight structure formed by the second end 32 of the corrugated paper, the second end 22 of the inner cup paper, and the bonding part 211. Also, by pressing after pasting the sealing edge region 4, a multi-layer reinforced layer is formed, and the effect as a support beam is exerted.

[0032] The cup body is formed by winding and attaching the fan-shaped sheet 11 in Fig. 6. The cross-sectional shape of the cup body is as shown in Fig. 7. An adhesive layer 9 is further provided between the inner cup paper 2 and the corrugated paper 3. The recessed portions of the corrugated paper 3 with a corrugated structure are attached to and fixed to the inner cup paper 2 via the adhesive layer 9. Also, the protruding portions of the corrugated paper 3 with a corrugated structure form heat-insulating cavities. In the curl region 5, when the structure in Fig. 6 is pressed, the structure after pressing in Fig. 8 is formed. When the curl region 5 is pressed, the protruding portions of the corrugated paper 3 form folds. The folds strengthen the strength of the curl region 5 and prevent deformation from occurring during the use of the curl 51. At this time, the curl 51 is formed by winding a part of the curl region 5 strengthened by the folds. Also, by winding the folds together into the curl 51, the structural strength of the curl 51 becomes good.

[0033] The principle of this means is as follows. When forming the paper cup 1, after hooking the adhesive part 211 and the inner surface of the inner cup paper 2, by hooking the second end 22 of the inner cup paper to the first end 31 of the corrugated paper, the paper cup 1 is evenly spanned at the connection location. Thereby, a direct connection between the first end 31 of the corrugated paper and the main body of the inner cup paper 2 is avoided. Also, in the hooking region 4, since the end face of the first end 31 of the corrugated paper abuts against the waterproof layer 8 and one end of the adhesive layer 9 abuts against the waterproof layer 8, the sealing performance and connection strength of the hooking region 4 are improved. When forming the curl 51 and the cup bottom leg 61 on the paper cup 1, since there are many layers at the hooking location, curling and bending are not easy. Therefore, the curl region 5 and the bending region 7 are formed by pressing the paper cup 1. Also, the situation where the strength decreases due to pressing is compensated for by the folds of the corrugated paper 3.

Example

[0034] Example 2 is basically the same as Example 1, but is different in that the sealing edge area 4 has a butted structure. Specifically, as shown in FIG. 10, the first end 31 of the corrugated paper and the second end 32 of the corrugated paper are butted together. And the butting position is located on one side of the bonding part 211. Alternatively, a gap is maintained between the first end 31 of the corrugated paper and the second end 32 of the corrugated paper. The sealing edge area 4 is composed of three layers formed by the second end 32 of the corrugated paper, the second end 22 of the inner cup paper, and the bonding part 211, and two layers formed by the first end 31 of the corrugated paper and the first end 21 of the inner cup paper. Compared with the sealing edge area 4 of Example 1, although the number of layers is reduced, it can still have sufficient strength to maintain the strength of the curl area 5. This is because the inner cup paper 2 is thick paper and has sufficient strength.

Example

[0035] Example 3 is basically the same as Example 1 or Example 2, but is different in that the corrugated paper 3 has a flat structure. The corrugated paper is tinfoil, plastic paper, silicone oil paper, cellophane, or asphalt paper that can be subjected to various shapes and designs. Since the inner cup paper 2 is thick paper, even if a curl is formed by winding it together with the outer layer paper by such a sealing edge structure, it has sufficient strength.

[0036] The specific examples described in this text are only examples to illustrate the scope of the present invention. Those skilled in the art can make various modifications or supplements to the described specific examples, or replacements in a similar manner, but these do not deviate from the scope of the present invention, nor do they exceed the scope defined in the appended claims.

Explanation of Reference Numerals

[0037] 1 Paper cup 11 Sector sheet 111 First hypotenuse 113 Upper arc side 114 Lower arc side 112 Second hypotenuse 2 Inner cup paper 21 First end of the inner cup paper 211 Adhesive part 22 Second end of the inner cup paper 3 Corrugated paper 31 First end of the corrugated paper 32 Second end of the corrugated paper 4 Sealing edge area 5 Curling area 51 Curl 52 Cup wall 6 Cup bottom 61 Cup bottom leg 62 Adhesive layer 7 Bending area 71 Folding layer 8 Waterproof layer 9 Adhesive layer

Claims

Claim 1 A corrugated paper cup including a cup body formed by winding a sector sheet (11), wherein the sector sheet (11) includes an inner cup paper (2) and a single-layer corrugated paper (3) attached to the outer peripheral surface of the inner cup paper (2), by shifting and parallelizing the first end (31) of the corrugated paper and the first end (21) of the inner cup paper, a first hypotenuse (111) of the sector sheet (11) is formed, and the second end (32) of the corrugated paper and the second end (22) of the inner cup paper are aligned to form a second hypotenuse (112) of the sector sheet (11). After the corrugation of the sector sheet (11) is unfolded, the direction of the stripes is a horizontal stripe in the direction from the first hypotenuse (111) to the second hypotenuse (112). When the sector sheet (11) is wound to form a sealed edge, the second hypotenuse (112) and the first hypotenuse (111) of the sector sheet (11) are laminated to form a sealed edge region (4) where at least three layers of paper are closely attached. The thickness formed after the corrugated cavity region close to the upper arc edge (113) in the sector sheet (11) is flattened is smaller than the thickness of the middle part of the sector sheet (11), and a part of the flattened corrugated cavity region is wound outward together with the inner cup paper (2) to form a curl (51). A corrugated paper cup characterized by this. Claim 2 The corrugated paper and the inner cup paper at the upper arc edge (113) and the lower arc edge (114) of the sector sheet (11) are aligned. The thickness formed after the corrugated cavity region close to the lower arc edge (114) in the sector sheet (11) is flattened is smaller than the thickness of the middle part of the sector sheet (11), and a part of the flattened corrugated cavity region is bent inward together with the inner cup paper (2) to form a cup bottom leg (61). The corrugated paper cup according to claim 1, characterized by this. Claim 3 After the region close to the upper arc edge (113) or the region close to the lower arc edge (114) in the sector sheet (11) is flattened by pressing, the corrugation is flattened to form a fold, and these folds are involved in the curl (51) or the cup bottom leg (61). The corrugated paper cup according to claim 1 or 2, characterized by this. Claim 4 The corrugated paper cup according to claim 3, characterized in that the thickness of the inner cup paper (2) is larger than the thickness of the corrugated paper (3). Claim 5 The corrugation of the corrugated paper (3) is a straight stripe corrugation, and the direction of the straight stripe is perpendicular to the first hypotenuse (111). The corrugated paper cup according to claim 3, characterized in that.

6. The corrugation of the corrugated paper (3) is a horizontally wavy stripe extending from the first hypotenuse (111) to the second hypotenuse (112). The corrugated paper cup according to claim 3, characterized in that.

7. The corrugation of the corrugated paper (3) is discontinuous corrugated cavities distributed horizontally from the first hypotenuse (111) to the second hypotenuse (112), including round dot-shaped corrugated cavities or rectangular corrugated cavities. The corrugated paper cup according to claim 3, characterized in that.

8. The first hypotenuse (111) of the fan-shaped sheet (11) has an inner cup paper area not covered by the corrugated paper (3), and this area becomes the bonding part (211). When the second end (22) of the inner cup paper is attached to the outer surface of the first end (31) of the corrugated paper, the sealing edge area (4) is composed of the second end (32) of the corrugated paper, the second end (22) of the inner cup paper, the first end (31) of the corrugated paper, and the first end (21) of the inner cup paper. The corrugated paper cup according to claim 1, characterized by including a four-layer reinforcement structure formed by the above and a three-layer watertight structure formed by the second end (32) of the corrugated paper, the second end (22) of the inner cup paper, and the bonding part (211).

9. The first hypotenuse (111) of the fan-shaped sheet (11) has an inner cup paper area not covered by the corrugated paper (3), and this area becomes the bonding part (211). When the second end (22) of the inner cup paper is attached only to the bonding part (211), the first end (31) and the second end (32) of the corrugated paper are aligned with each other or maintain a gap. The sealing edge area (4) includes a three-layer watertight structure formed by the second end (32) of the corrugated paper, the second end (22) of the inner cup paper, and the bonding part (211). The corrugated paper cup according to claim 1, characterized in that.

10. A waterproof layer (8) is provided on the inner wall of the inner cup paper (2). When the bonding part (211) is hooked on the inner surface of the second end (22) of the inner cup paper to form a sealed attachment and connection, one end of the waterproof layer (8) is connected to the main body of the waterproof layer (8). The corrugated paper cup according to claim 8 or 9, characterized in that.

11. The paper cup further includes a cup bottom (6), and an adhesive layer (62) is provided on the cup bottom (6). By pressing the lower arc side (114) of the fan-shaped sheet (11), a bending region (7) is formed. By bending the end of the bending region (7) inward, a folding layer (71) is formed. The adhesive layer (62) is adhesively attached in a sealed manner between the bending region (7) and the folding layer (71). The corrugated paper cup according to claim 10, characterized in that.

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