Double-layer heat-insulating paper cup and preparation device thereof

Abstract

The present invention relates to the technical field of paper cup processing, and discloses a double-layer heat-insulating paper cup and its preparation device, including a cup body. The cup body is divided into an outer layer of the paper cup and an inner layer of the paper cup. By using food-grade wood pulp paper and spraying a layer of polyethylene (PE) film on the inner layer, the wood pulp paper itself has good toughness, can withstand a certain pressure, has high strength, and can better maintain the shape of the paper cup. This layer of PE can prevent liquid penetration, and there is a cavity with a certain interval between the outer layer and the inner layer of the paper cup on the cup body. The air in the cavity is a poor conductor of heat, and this layer of air can play a good heat-insulating role, avoiding the problem of scalding hands when holding hot drinks and slowing down the heat loss rate of hot drinks. Moreover, both the outer layer and the inner layer of the paper cup are in a U-shaped inward bending structure, which can increase the contact surface between the outer layer and the inner layer of the paper cup during bonding and improve the sealing performance.

Description

Technical Field

[0001] The invention relates to the technical field of paper cup processing, and in particular to a double-layer heat-insulating paper cup and a preparation device thereof. Background Art

[0002] Paper cups are paper containers made by mechanically processing and gluing base paper (white paperboard) made of chemical wood pulp. They are cup-shaped in appearance. Paper cups are mostly made of paper, but paper itself is absorbent. If used directly to hold liquids, paper cups will quickly become soft and break. Therefore, there will be a thin layer of polyethylene (PE) coating on the inner layer of the paper cup. Paper cups for frozen foods are coated with wax and can hold ice cream, jam, butter, etc. Paper cups for hot drinks are coated with plastic and can withstand temperatures above 90°C and can even hold boiling water. Paper cups are safe, hygienic, light and convenient, and are widely used in people's lives. They can be used in public places, hotels, and restaurants, and are disposable items.

[0003] Prior art, such as Chinese patent "CN209718755U", provides a paper cup forming production device, including a rotating column and a driving motor. The rotating column is provided with a rotating disk 1 and a rotating disk 2 for rotation. A number of paper cup mold units are installed on each edge surface in the circumferential direction of the rotating disk 1, and a clamping mechanism is provided on the rotating disk 2. Compared with the prior art, the advantages of this utility model are: the production line of traditional paper cup processing is converted into a disc shape, which saves floor space. The steps of forming the cup body, heating the connection of the cup body, and splicing the cup bottom are realized through a paper cup mold unit. There is no need to transport the paper cup multiple times and re-clamp and position it, which ensures the accuracy of the processing and makes the processing steps more compact. The clamping structure moves synchronously with the rotating disk to ensure that the time at the bonding part of the cup body is sufficient and the qualified rate is improved. The hinged setting of the rotating block saves the pressing time and is more efficient. The stepper motor is easy to control to ensure that each rotation is consistent with the processing time.

[0004] As consumers' requirements for the quality and drinking comfort of hot drinks continue to increase, ordinary paper cups will be scalding when holding hot drinks. The emergence of double-layer insulated paper cups solves this problem. It can effectively block heat transfer, allowing consumers to easily hold the cup to enjoy hot drinks, and can maintain a suitable temperature for a long time. Double-layer insulated paper cups have a two-layer structure as the name implies. There is a certain air gap between the outer layer and the inner layer. Air is a poor conductor of heat. This layer of air can play a good role in heat insulation. However, in this solution, the steps of forming the cup body, heating the connection of the cup body, and splicing the bottom of the cup are realized through a paper cup mold unit. The paper cup does not need to be transported and re-clamped and positioned multiple times. There are great limitations in the preparation of double-layer insulated paper cups, and they cannot be well adapted. Conventional preparation equipment has certain limitations in the processing of the air gap between the outer layer and the inner layer of the double-layer insulated paper cup. Summary of the invention

[0005] The purpose of the present invention is to provide a double-layer heat-insulating paper cup and a manufacturing device thereof in order to solve the above-mentioned problems and overcome the defects of the prior art, as described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a double-layer heat-insulating paper cup and a preparation device thereof, comprising a cup body, wherein the cup body is divided into a paper cup outer layer and a paper cup inner layer, wherein the paper cup outer layer and the paper cup inner layer are both bent inward in a U-shape, and the top and bottom horizontally fitting areas of the paper cup outer layer and the paper cup inner layer are bonded to each other, and a cavity for heat insulation is opened at a vertical position between the paper cup outer layer and the paper cup inner layer, and the bottom of the cup body is bonded to the bottom of the paper cup.

[0007] Preferably, a workbench is included, and a winding mechanism is provided on the left side of the top of the workbench for winding the paper roll into a paper cup outer layer and a paper cup inner layer of the cup body; The top of the workbench is located on the right side of the winding mechanism and is provided with a bonding mechanism for bonding the top and bottom of the outer layer of the paper cup and the inner layer of the paper cup; A bottom sealing mechanism is arranged on the top of the workbench above the bonding mechanism, and is used to bond the bottom of the paper cup to the bottom of the cup body.

[0008] Preferably, the winding mechanism includes a unwinding drum, which is arranged on the left side of the top of the workbench, and the bottom of the inner wall of the unwinding drum is rotatably connected to the unwinding shaft, and the bottom of the unwinding shaft is provided with an unwinding motor, and the right side of the outer wall of the unwinding drum is fixedly connected to a guide groove, and the end of the top of the workbench on the right side of the guide groove is fixedly connected to a winding drum, and the winding drum is respectively provided with an outer winding groove and an inner winding groove for winding the outer layer and the inner layer of the paper cup body, and the guide groove is located on both sides of the unwinding drum joint and is rotatably connected to conveying rollers for conveying paper rolls, and a heating rod is provided inside the conveying rollers.

[0009] Preferably, one end of the top of the two conveying rollers is respectively fixedly connected with a gear, and the two gears are meshed with each other, and the bottom of the guide groove is fixedly connected to a servo motor for driving one group of conveying rollers to rotate.

[0010] Preferably, a first cylinder is fixedly connected to the top of the workbench, which is used to switch the guide groove to align with the outer rolling groove or the inner rolling groove.

[0011] Preferably, the bonding mechanism includes two groups of guide tubes, which are symmetrically arranged at the top and bottom of the curling cylinder. The outer walls of the two groups of guide tubes are sliding buckles, and the inner walls of the two groups of guide tubes are slidingly connected to the magnetic piston for magnetic traction of the buckles. The outer walls of the two groups of buckles are respectively rotatably connected to hot pressing rollers.

[0012] Preferably, an air cylinder is fixedly connected to the top of the workbench, and the air cylinder is communicated with the guide pipe. A piston plate is fixedly connected to the inner wall of the air cylinder, and a second cylinder for driving the piston plate to move is fixedly connected to the top of the workbench.

[0013] Preferably, the guide pipe is annular, and a section of the pipe body that coincides with the annular part in the vertical direction is spirally rising, and a straight end extending to the outside of the ring is provided at the end of the spiral section of the pipe body.

[0014] Preferably, the bottom sealing mechanism includes a column, the column is fixedly connected to the workbench, a swing rod is rotatably connected to the top of the workbench, a stepping motor for driving the swing rod to rotate is arranged inside the column, and a third cylinder is fixedly connected to the inner wall of the swing rod above the curling cylinder, and a hot pressing plate is fixedly connected to the bottom of the third cylinder.

[0015] The beneficial effects are as follows: 1. By using food-grade wood pulp paper in the present invention, a layer of polyethylene (PE) coating is sprayed on the inner layer. The wood pulp paper itself has good toughness, can withstand a certain pressure, has high strength, and can better maintain the shape of the paper cup. And this layer of PE can prevent liquid penetration, and there is a cavity with a certain interval between the outer layer and the inner layer of the paper cup on the cup body. The air in the cavity is a poor conductor of heat, and this layer of air can play a good heat insulation role, avoiding the problem of scalding when holding hot drinks, and slowing down the heat loss rate of hot drinks. Moreover, both the outer layer and the inner layer of the paper cup are bent inward in a C-shaped structure, which can increase the contact surface between the outer layer and the inner layer of the paper cup during bonding and improve the sealing performance.

[0016] 2. In the present invention, the paper roll is sleeved on the unwinding shaft, the unwinding motor drives the unwinding shaft to rotate, and through the guiding of the guiding groove, one end of the paper roll passes through the position between the two groups of conveying rollers. At this time, one of the groups of conveying rollers is driven to rotate by the servo motor, and the other group of conveying rollers also starts to rotate through the meshing of the two gears. Under the action of the rotation of the two groups of conveying rollers, the paper roll is conveyed into the inner curling groove and is curled into a cylinder to form the inner layer of the paper cup. At this time, the unwinding motor locks the unwinding shaft, and under the action of the two groups of conveying rollers, the paper roll is torn at the easy-to-tear line. Then, the first cylinder drives the unwinding cylinder to move so that the guiding groove is aligned with the outer curling groove, and the outer layer of the paper cup is curled through the cooperation of the conveying rollers and the outer curling groove. By setting the winding mechanism, the paper roll can be quickly curled into the outer layer and the inner layer of the paper cup to facilitate the subsequent bonding work and greatly improve the processing efficiency.

[0017] III. When the outer layer and the inner layer of the paper cup are curled, the second cylinder is used to push the piston plate to squeeze the air inside the air chamber, so that the air enters the guide tube to push the magnetic piston to slide, and under the action of the magnetic attraction of the magnetic piston, the hot pressing roller on the sliding buckle is pulled to move in a circular motion. The outer layer and the inner layer of the paper cup in the outer curling groove and the inner curling groove are bent into a U shape by the rolling of the hot pressing roller and heated to be bonded. When the sliding buckle moves to the end of the guide tube, the second cylinder is used to drive the piston plate to extract the air in the guide tube to make the hot pressing roller return to the initial position for subsequent bottom sealing. After the outer layer and the inner layer of the paper cup are bonded to form the cup body, the paper cup bottom is placed on the top of the bonded cup body, and the third cylinder is used to drive the hot pressing plate to press down, so that the paper cup bottom is closely attached to the cup body and heated for bonding to ensure the sealing performance of the connection of the paper cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a structural display diagram of the double-layer heat-insulating paper cup in the present invention; Figure 2 It is a schematic external structure diagram of the double-layer heat-insulating paper cup manufacturing equipment of the present invention; Figure 3 It is a schematic structural diagram of the winding mechanism in the present invention; Figure 4 It is in the present invention Figure 3 Enlarged view of the gear area; Figure 5 It is a schematic structural diagram of the bonding mechanism in the present invention; Figure 6 It is a schematic structural diagram of the guide tube in the present invention; Figure 7 It is a schematic structural diagram of the bottom sealing mechanism in the present invention.

[0020] Explanation of the reference numerals in the drawings is as follows: 1, workbench; 2, winding mechanism; 21, unwinding reel; 22, unwinding shaft; 23, guide groove; 24, curling cylinder; 25, inner curling groove; 26, outer curling groove; 27, conveying roller; 271, gear; 28, first cylinder; 3, bonding mechanism; 31, guide tube; 32, sliding buckle; 33, hot pressing roller; 34, air chamber; 35, piston plate; 36, second cylinder; 4, bottom sealing mechanism; 41, column; 42, swing rod; 43, third cylinder; 44, hot pressing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0022] See Figure 1 - Figure 7 As shown, the present invention provides a double-layer heat-insulating paper cup and its preparation device, including a cup body. The cup body is divided into an outer layer of the paper cup and an inner layer of the paper cup. Both the outer layer of the paper cup and the inner layer of the paper cup are bent inward in a U-shape, and the areas where the tops and bottoms of the outer layer of the paper cup and the inner layer of the paper cup are horizontally attached are bonded to each other. A cavity for heat insulation is provided at a vertical position between the outer layer of the paper cup and the inner layer of the paper cup. A paper cup bottom is bonded to the bottom of the cup body. The paper cup is made of food-grade wood pulp paper, and a layer of polyethylene (PE) film is sprayed on the inner layer. The wood pulp paper itself has good toughness, can withstand a certain pressure, and has high strength, which can better maintain the shape of the paper cup. And this layer of PE can prevent liquid penetration. There is a cavity with a certain interval between the outer layer of the paper cup and the inner layer of the paper cup in the cup body. The air in the cavity is a poor conductor of heat. This layer of air can play a good heat-insulating role. Moreover, both the outer layer of the paper cup and the inner layer of the paper cup are in a U-shaped inward-bending structure, which can increase the contact surface between the outer layer of the paper cup and the inner layer of the paper cup during bonding and can improve the sealing performance. It includes a workbench 1. A winding mechanism 2 is arranged on the left side of the top of the workbench 1 for winding the paper roll into the outer layer and the inner layer of the paper cup of the cup body. A bonding mechanism 3 is arranged on the right side of the winding mechanism 2 at the top of the workbench 1 for bonding the tops and bottoms of the outer layer of the paper cup and the inner layer of the paper cup. A bottom-sealing mechanism 4 is arranged above the bonding mechanism 3 at the top of the workbench 1 for bonding the paper cup bottom to the bottom of the cup body.

[0023] In this embodiment, please refer to Figure 2 , Figure 3 , Figure 4The winding mechanism 2 includes a reel 21, which is arranged on the left side of the top of the workbench 1. The bottom of the inner wall of the reel 21 is rotatably connected with a reel shaft 22, and a reel motor is arranged at the bottom of the reel shaft 22. A guide groove 23 is fixedly connected to the right side of the outer wall of the reel 21. A winding drum 24 is fixedly connected to one end of the top of the workbench 1 on the right side of the guide groove 23. The winding drum 24 is respectively provided with an outer reel groove 26 and an inner reel groove 25 for curling the outer layer and the inner layer of the paper cup body. The guide groove 23 is located at the joint of the reel 21 and is rotatably connected to conveying rollers 27 for conveying paper rolls, and a heating rod is arranged inside the conveying roller 27. One end of the top of the two conveying rollers 27 is respectively fixedly connected with a gear 271, and the two gears 271 are meshed with each other. The bottom of the guide groove 23 is fixedly connected with a servo motor for driving one group of conveying rollers 27 to rotate. A first cylinder 28 is fixedly connected to the top of the workbench 1 for switching the guide groove 23. The outer roll groove 26 or the inner roll groove 25 is aligned with the groove 23, and the paper roll is sleeved on the unwinding shaft 22. The unwinding motor drives the unwinding shaft 22 to rotate, and one end of the paper roll passes through the position between the two sets of conveying rollers 27 through the guidance of the guide groove 23. At this time, the servo motor drives one set of conveying rollers 27 to rotate, and the other set of conveying rollers 27 also starts to rotate through the meshing of two gears 271. Under the action of the rotation of the two sets of conveying rollers 27, the paper roll is conveyed to the inner roll groove 25 and The paper is rolled into a cylinder in the inner roll groove 25 to form the inner layer of the paper cup. At this time, the unwinding motor locks the unwinding shaft 22. Under the action of the two sets of conveying rollers 27, the paper roll is torn at the easy-tear line. Then the first cylinder 28 drives the unwinding drum 21 to move so that the guide groove 23 is aligned with the outer roll groove 26. Under the cooperation of the conveying roller 27 and the outer roll groove 26, the paper is rolled to form the outer layer of the paper cup. By setting the winding mechanism 2, the paper roll can be quickly rolled to form the outer layer and the inner layer of the paper cup to facilitate bonding.

[0024] For further information, see Figure 5 , Figure 6, the bonding mechanism 3 includes two sets of guide tubes 31, which are symmetrically arranged at the top and bottom of the curling cylinder 24. The outer walls of the two sets of guide tubes 31 are both slidably buckled with buckles 32, and the inner walls of the two sets of guide tubes 31 are slidably connected with magnetic pistons for magnetically pulling the buckles 32. The outer walls of the two buckles 32 are respectively rotatably connected with hot pressing rollers 33. The top of the workbench 1 is fixedly connected with an air box 34, and the air box 34 is communicated with the guide tubes 31. The inner wall of the air box 34 is fixedly connected with a piston plate 35. The top of the workbench 1 is fixedly connected with a second air cylinder 36 for driving the piston plate 35 to move. When the outer layer and the inner layer of the paper cup are curled, the second air cylinder 36 is used to push the piston plate 35 to squeeze the air inside the air box 34, so that the air enters the guide tubes 31 to push the magnetic pistons to slide, and under the action of the magnetic attraction of the magnetic pistons, the hot pressing rollers 33 on the buckles 32 are pulled to make a circular motion. The outer layer and the inner layer of the paper cup in the outer curling groove 26 and the inner curling groove 25 are bent into a U shape and heated to be bonded by the rolling of the hot pressing rollers 33. When the buckles 32 move to the end of the guide tubes 31, the second air cylinder 36 is used to drive the piston plate 35 to extract the air inside the guide tubes 31 to make the hot pressing rollers 33 return to the initial position for subsequent bottom sealing. The guide tubes 31 are annular, and a section of the tube body that coincides with the annular part in the vertical direction is spirally rising, and a straight line extending to the outside of the ring is arranged at the position of the end of the spiral section of the tube body.

[0025] Furthermore, please refer to Figure 7 , the bottom sealing mechanism 4 includes a column 41, the column 41 is fixedly connected to the workbench 1, the top of the workbench 1 is rotatably connected with a swing rod 42, and a stepping motor for driving the swing rod 42 to rotate is arranged inside the column 41. The inner wall of the swing rod 42 is fixedly connected with a third air cylinder 43 at a position above the curling cylinder 24. The bottom of the third air cylinder 43 is fixedly connected with a hot pressing disc 44. After the outer layer and the inner layer of the paper cup are bonded to form a cup body, the paper cup bottom is placed on the top of the bonded cup body. The third air cylinder 43 is used to drive the hot pressing disc 44 to press down, so that the paper cup bottom is closely attached to the cup body and heated for bonding, so that the connection between the paper cup bottom and the cup body is strong enough.

[0026] Working principle In use, the paper roll is sleeved on the unwinding shaft 22. The unwinding motor drives the unwinding shaft 22 to rotate. Guided by the guiding groove 23, one end of the paper roll passes through the position between the two groups of conveying rollers 27. At this time, one group of conveying rollers 27 is driven to rotate by the servo motor. The engagement of the two gears 271 causes the other group of conveying rollers 27 to also start rotating. Under the action of the rotation of the two groups of conveying rollers 27, the paper roll is conveyed into the inner winding groove 25 and wound into a cylinder in the inner winding groove 25 to form the inner layer of the paper cup. At this time, the unwinding motor locks the unwinding shaft 22. Under the action of the two groups of conveying rollers 27, the paper roll is torn off at the tear line. Then, the first cylinder 28 drives the unwinding cylinder 21 to move, so that the guiding groove 23 is aligned with the outer winding groove 26. The outer layer of the paper cup is curled under the cooperation of the conveying rollers 27 and the outer winding groove 26. When the outer layer and the inner layer of the paper cup are curled, the second cylinder 36 pushes the piston plate 35 to squeeze the air inside the air box 34, so that the air enters the guiding tube 31 to push the magnetic piston to slide. Under the action of the magnetic attraction of the magnetic piston, the hot pressing roller 33 on the sliding buckle 32 is driven to move in a circular motion. The outer layer and the inner layer of the paper cup in the outer winding groove 26 and the inner winding groove 25 are bent into a U shape and heated to bond them by the rolling of the hot pressing roller 33. When the sliding buckle 32 moves to the end of the guiding tube 31, the second cylinder 36 drives the piston plate 35 to extract the air in the guiding tube 31 to make the hot pressing roller 33 return to the initial position to facilitate subsequent bottom sealing. After the outer layer and the inner layer of the paper cup are bonded to form the cup body, the paper cup bottom is placed on the top of the bonded cup body. The third cylinder 43 drives the hot pressing plate 44 to press down, so that the paper cup bottom is closely attached to the cup body and heated for bonding, so that the connection between the paper cup bottom and the cup body is firm enough. After the outer layer and the inner layer of the paper cup are bonded to form the cup body, the paper cup bottom is placed on the top of the bonded cup body. The third cylinder 43 drives the hot pressing plate 44 to press down, so that the paper cup bottom is closely attached to the cup body and heated for bonding.

[0027] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A double-layer heat-insulating paper cup, characterized in that: The invention comprises a cup body, wherein the cup body is divided into a paper cup outer layer and a paper cup inner layer, wherein the paper cup outer layer and the paper cup inner layer are both bent inward in a U shape, and the top and bottom horizontally fitting areas of the paper cup outer layer and the paper cup inner layer are bonded to each other, and a cavity for heat insulation is opened at a vertical position between the paper cup outer layer and the paper cup inner layer, and the bottom of the cup body is bonded to the bottom of the paper cup.

2. A double-layer insulated paper cup preparation device, used for preparing the double-layer insulated paper cup according to claim 1, characterized in that: It comprises a workbench (1), wherein a winding mechanism (2) is arranged on the left side of the top of the workbench (1) for winding a paper roll into a paper cup outer layer and a paper cup inner layer of a cup body; A bonding mechanism (3) is provided on the top of the workbench (1) and on the right side of the winding mechanism (2), and is used to bond the top and bottom of the outer layer of the paper cup and the inner layer of the paper cup; A bottom sealing mechanism (4) is provided at the top of the workbench (1) above the bonding mechanism (3), and is used to bond the bottom of the paper cup to the bottom of the cup body.

3. The device for preparing a double-layer heat-insulating paper cup according to claim 2, characterized in that: The winding mechanism (2) comprises a reel (21), the reel (21) being arranged on the left side of the top of the workbench (1), the bottom of the inner wall of the reel (21) being rotatably connected to a reel shaft (22), the bottom of the reel shaft (22) being provided with a reel motor, the right side of the outer wall of the reel (21) being fixedly connected to a guide groove (23), the top end of the workbench (1) being located on the right side of the guide groove (23) being fixedly connected to a winding drum (24), the winding drum (24) being provided with an outer winding groove (26) and an inner winding groove (25) for winding the outer layer and the inner layer of the paper cup body, respectively, the two sides of the guide groove (23) at the joint of the reel (21) being rotatably connected to conveying rollers (27) for conveying paper rolls, and a heating rod being provided inside the conveying rollers (27).

4. The device for preparing a double-layer heat-insulating paper cup according to claim 3, characterized in that: One end of the top of the two conveying rollers (27) is fixedly connected to a gear (271) respectively, and the two gears (271) are meshed with each other. The bottom of the guide groove (23) is fixedly connected to a servo motor for driving one group of conveying rollers (27) to rotate.

5. The device for preparing a double-layer heat-insulating paper cup according to claim 3, characterized in that: A first cylinder (28) is fixedly connected to the top of the workbench (1) and is used to switch the guide groove (23) to align with the outer rolling groove (26) or the inner rolling groove (25).

6. The device for preparing a double-layer heat-insulating paper cup according to claim 3, characterized in that: The bonding mechanism (3) comprises two groups of guide tubes (31), the two groups of guide tubes (31) are symmetrically arranged at the top and bottom of the curling cylinder (24), the outer walls of the two groups of guide tubes (31) are both provided with sliding buckles (32), and the inner walls of the two groups of guide tubes (31) are slidingly connected to a magnetic piston for magnetically pulling the buckles (32), and the outer walls of the two groups of buckles (32) are respectively rotatably connected to hot pressing rollers (33).

7. A device for preparing a double-layer heat-insulating paper cup according to claim 6, characterized in that: The top of the workbench (1) is fixedly connected to an air box (34), and the air box (34) is communicated with the guide tube (31). The inner wall of the air box (34) is fixedly connected to a piston plate (35). The top of the workbench (1) is fixedly connected to a second cylinder (36) for driving the piston plate (35) to move.

8. The device for preparing a double-layer heat-insulating paper cup according to claim 6, characterized in that: The guide tube (31) is annular, wherein a section of the tube body that overlaps with the annular portion in the vertical direction is in a spiral ascending shape, and a straight end extending to the outside of the annular shape is provided at the end of the spiral section of the tube body.

9. The device for preparing a double-layer heat-insulating paper cup according to claim 3, characterized in that: The bottom sealing mechanism (4) comprises a column (41), the column (41) being fixedly connected to the workbench (1), the top of the workbench (1) being rotatably connected to a rocker rod (42), a stepping motor for driving the rocker rod (42) to rotate being arranged inside the column (41), a third cylinder (43) being fixedly connected to the inner wall of the rocker rod (42) at a position above the curling cylinder (24), and a hot pressing plate (44) being fixedly connected to the bottom of the third cylinder (43).

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