Preparation method of transparent cake support

Abstract

The embodiment of the invention provides a preparation method of a transparent cake support, and relates to the technical field of cake support processing. A preparation method of a transparent cake support comprises the first step of raw material preparation, the second step of solution preparation, the third step of plasticizing extrusion, the fourth step of cooling solidification, the fifth step of stretching forming and the sixth step of finished product preparation, an efficient convex rib and notch improvement process is applied, the hardness of the cake support is improved, cakes and cakes are effectively contained, and the cake support is convenient to use. And in the step 6 of finished product preparation, feeding operation is conducted on unprocessed transparent cake support blanks and processed transparent cake support finished products through a feeding assembly, manual feeding and discharging operation is not needed, the annular cutting effect is achieved on openings of the transparent cake support blanks exposed out of a containing mold groove through an annular cutting assembly, and the processing efficiency is improved. Time and labor are saved, efficiency is high, the phenomena that notches occur due to excessive cutting and residual materials remain due to too light cutting are avoided, and the ring cutting quality of the transparent cake supporting blank is improved.

Description

Technical Field

[0001] This invention belongs to the field of cake tray processing technology, and particularly relates to a method for preparing a transparent cake tray. Background Technology

[0002] Cake trays are open-type boxes for holding small cakes and pastries. Based on the requirements for displaying cakes and pastries, a wide variety of cake trays have appeared on the market, including transparent cake trays, which are mainly designed to directly show the full appearance of the cakes and pastries. However, the production process of transparent cake trays is relatively simple, and it is not possible to apply efficient ribs and concave grooves to improve the process. This results in cake trays that are not sturdy enough and have low processing efficiency.

[0003] In existing technology (patent application CN210818795U, entitled "A Cake Tray Processing Device"), blowing the debris generated during processing towards the bottom wall of the processing chamber can greatly reduce the adverse effects of debris accumulation on processing. However, in implementing this technical solution, at least the following problems were found in the existing technology: During the processing of cake trays, due to the presence of rough edges and burrs at the openings, the cake trays are typically fed to the processing area manually, and then each tray is cut individually to remove the rough edges and burrs. This process is not only inefficient, but also results in the cake trays being too soft and difficult to shape, leading to over-cutting at the openings, resulting in gaps, or under-cutting leaving residual material. This results in a high scrap rate and low quality. Summary of the Invention

[0004] This application aims to at least address the technical problems existing in the prior art, such as the inability to achieve efficient and precise processing of cake trays after applying raised ribs and notches using a continuous method combining feeding and circumferential cutting, resulting in high scrap rates and low quality and efficiency. Therefore, this application proposes a method for preparing transparent cake trays.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: A method for preparing a transparent cake tray includes the following steps: Step 1: Raw material preparation: The main raw material of PET film is polyethylene terephthalate particles. Polyethylene terephthalate is produced by first synthesizing diethyl terephthalate by ester exchange of dimethyl terephthalate and ethylene glycol or by esterification of terephthalic acid and ethylene glycol, and then carrying out a polycondensation reaction. Step 2, Solution Preparation: After pre-drying, the PET granules are heated and melted using an extruder to form a viscous PET film solution. Plasticizers, stabilizers, and antistatic agents are added to the solution to improve the film's performance. Step 3, Plasticizing and Extrusion: The PET film solution is plasticized and extruded through the screw of the extruder to make it into a uniform molten state. The extruder extrudes the film solution through heating and extrusion, and stretches and presses it through the action of multiple calendering rollers to make it gradually thinner. Step 4: Cooling and curing: After the extruded PET film passes through the calendering rollers, it needs to be rapidly cooled by the cooling rollers to cure it quickly. Cooling rollers are generally cooled with cooling water to ensure the quality and flatness of the film. Step 5, Stretching and Molding: First, pre-dry the PET resin chips to prevent hydrolysis. Then, extrude the amorphous thick sheets at 280°C through a T-die in an extruder. After being rapidly cooled by a cooling drum or coolant, the sheets maintain their amorphous shape for stretching and orientation. The thick sheets are then bi-directionally stretched by a tenter frame to produce PET films. Step 6, Finished Product Preparation: After slicing the prepared PET film, place it into a mold with raised ribs and recesses in a thermoforming machine for thermoforming to obtain a transparent cake tray with alternating raised ribs and recesses. Then, it is further processed by processing equipment to remove burrs and excess material, resulting in a finished transparent cake tray made of PET material.

[0006] Preferably, in the stretching and forming operation in step five, longitudinal stretching involves preheating the thick sheet to 86-87°C and stretching it approximately three times along the plane of the sheet at this temperature to improve its orientation and crystallinity to reach a higher temperature. Transverse stretching involves a preheating temperature of 98-100°C, a stretching temperature of 100-120°C, a stretching ratio of 2.5-4.0, and a heat setting temperature of 230-240°C. The film after longitudinal and transverse stretching also needs to undergo heat setting to eliminate film deformation caused by stretching and produce a film with good thermal stability.

[0007] Preferably, the processing equipment in the finished product preparation in step six includes a processing table, and a raw material box and a finished product box that are snapped onto the outside of the processing table. The processing table is respectively equipped with a feeding component and a ring-cutting component for processing transparent cake trays.

[0008] Preferably, the feeding assembly includes an X-axis electric slide rail located on the outside of the processing table, and an X-axis electric slide block sliding on it. A Y-axis lifting cylinder is fixedly connected to the top of the X-axis electric slide block, and a Z-axis electric slide rail is fixedly connected to it via the piston rod on the Y-axis lifting cylinder. A Z-axis electric slide block sliding on the Z-axis electric slide rail is also fixedly connected to the bottom of the Z-axis electric slide block. An angle motor is fixedly connected to the bottom of the Z-axis electric slide block, and the output shaft of the angle motor is horizontally swung and adjusted by a swing arm over an electric suction cup.

[0009] Preferably, the ring-cutting assembly includes a flipping motor embedded in the swing arm, a sealing slide fixed on the output shaft of the flipping motor, and a stop seat for positioning the transparent cake tray fixed inside the sealing slide by a T-shaped slide block, and a gear ring sleeved on the outside of the sealing slide. A stepper motor is provided on the outside of the sealing slide, and a gear meshing with the gear ring is sleeved on the output shaft of the stepper motor, and a flat cutting blade holder is fixed for ring cutting the transparent cake tray after positioning by the stop seat.

[0010] Preferably, the processing table is provided with placement mold slots for placing transparent cake trays, which are located below the electric suction cups, and the suction cup opening area of ​​the electric suction cups is the same as the bottom area of ​​the transparent cake trays.

[0011] Preferably, displacement sensors are fixed on both the X-axis electric slide and the Z-axis electric slide, and the range of the electric chuck after displacement along the X, Y, and Z axes is the same as the cross-sectional area of ​​the processing table.

[0012] Preferably, the inner side of the X-axis electric slide is fixedly connected to a slide frame, and the slide frame slides in cooperation with the outer side of the processing table and is located on the outer side of the mold slot.

[0013] Preferably, the inner cavity of the sealed slide cylinder is fitted with a buffer spring that is fixedly matched with the T-shaped slide seat, and both the stop seat and the placement mold groove adopt a concave design that matches the convexity on the transparent cake tray.

[0014] Preferably, the sealing slide cylinder is provided with a sliding edge near the outer side of the gear ring, and a sliding cover box that is fixed and protected to the gear and the stepper motor is slidably connected to the sliding edge.

[0015] The method for preparing a transparent cake tray according to the present invention has the following advantages: 1. This method for preparing transparent cake trays involves first using two X-axis electric slide rails to simultaneously move the X-axis electric slide block axially, then using two Y-axis lifting cylinders to move the Y-axis axially, and finally using a single Z-axis electric slide rail to move the Z-axis electric slide block axially. Then, an angle motor, via a swing arm, horizontally rotates the electric suction cup. The electric suction cup, adjusted to its position via X-axis, Y-axis, and Z-axis displacement and horizontal rotation, can feed both the unprocessed transparent cake tray base and the finished transparent cake tray product. This eliminates the need for manual loading and unloading, achieving highly efficient processing of the transparent cake tray base.

[0016] 2. In this method for preparing a transparent cake tray, the following steps are taken: First, the rotating motor drives the stop seat on the sealed slide and the flat cutting blade holder on the stepper motor to rotate as a whole, and then the transparent cake tray is placed in the mold cavity after being loaded. Then, the stop seats on the T-shaped slide stop and position the transparent cake tray one by one. Then, the stepper motor drives the gear to make a circular motion around the gear ring. At the same time, the stepper motor also drives the flat cutting blade holder to rotate, and achieves a ring cutting effect on the opening of the transparent cake tray that is exposed in the mold cavity. This method is time-saving, labor-saving, and highly efficient. It also avoids over-cutting and the phenomenon of gaps, as well as under-cutting and residual material, thus improving the ring cutting quality of the transparent cake tray.

[0017] 3. In this method for preparing a transparent cake tray, a small integrated heating and cooling machine first provides a cold source, which is then supplied to the air distribution head by a small circulating pump on an electronically controlled valve. The cold source is then supplied to the transparent cake tray area placed in the mold cavity through the conveying hole at the conveying head by a cross-shaped pipe rack. The transparent cake tray to be ring-cut is cooled and hardened, which further improves the ring-cutting quality of the opening of the transparent cake tray by the flat cutting blade, preventing the phenomenon of incomplete cutting due to the softness of the opening of the transparent cake tray. This further improves the quality of removing burrs and residual material at the opening of the transparent cake tray, and reduces the defect rate and rework rate. After the transparent cake tray has cooled and hardened, the opening ring-cutting operation is completed. The small integrated heating and cooling machine is controlled to provide a heat source. Similarly, the heat source is supplied to the transparent cake tray area that has completed the ring-cutting in the mold groove through the conveying hole at the conveying head. The hardened transparent cake tray after ring-cutting is heated and restored, which is beneficial for subsequent processing operations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a method for preparing a transparent cake tray according to the present invention; Figure 2 This is a side view of the structure of a transparent cake tray preparation method according to the present invention; Figure 3 This is an exploded view of the structure of a transparent cake tray preparation method according to the present invention; Figure 4 This is a side view of the feeding assembly and ring cutting assembly structure of the present invention; Figure 5 This is a rear view of the feeding assembly structure of the present invention; Figure 6This is a cross-sectional view of the circumferential component structure of the present invention; Figure 7 This is a side view of the circumferential component structure of the present invention; Figure 8 This is a cross-sectional view of the sealing slide structure of the present invention; Figure 9 This is a cross-sectional view of the processing table and hardening assembly structure of the present invention; Figure 10 This is an exploded view of the hardening component structure of the present invention; Figure 11 This is a cross-sectional view of the processing table structure of the present invention; Figure 12 This is an exploded view of the dough box and transparent cake tray structure of the present invention.

[0020] The markings in the diagram are as follows: 1. Processing table; 2. Blank box; 3. Finished product box; 41. X-axis electric slide rail; 42. X-axis electric slide block; 43. Y-axis lifting cylinder; 44. Z-axis electric slide rail; 45. Z-axis electric slide block; 46. Angle motor; 47. Swing arm; 48. Electric suction cup; 51. Tilting motor; 52. Sealing slide cylinder; 53. T-shaped slide block; 54. Stop seat; 55. Gear ring; 56. Stepper motor; 57. Gear; 58. Flat cutting tool holder; 61. Small integrated heating and cooling machine; 62. Electric control valve; 63. Temperature sensor; 64. Small circulating pump; 65. Air distribution head; 66. Cross-type pipe rack; 67. Conveying head; 68. Conveying hole; 7. Slide frame; 8. Mold placement groove; 9. Buffer spring; 10. Sliding edge; 11. Sliding cover box. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: A method for preparing a transparent cake tray according to the present invention includes the following steps: Step 1: Raw material preparation: The main raw material of PET film is polyethylene terephthalate particles. Polyethylene terephthalate is produced by first synthesizing diethyl terephthalate by ester exchange of dimethyl terephthalate and ethylene glycol or by esterification of terephthalic acid and ethylene glycol, and then carrying out a polycondensation reaction. Step 2, Solution Preparation: After pre-drying, the PET granules are heated and melted using an extruder to form a viscous PET film solution. Plasticizers, stabilizers, and antistatic agents are added to the solution to improve the film's performance. Step 3, Plasticizing and Extrusion: The PET film solution is plasticized and extruded through the screw of the extruder to make it into a uniform molten state. The extruder extrudes the film solution through heating and extrusion, and stretches and presses it through the action of multiple calendering rollers to make it gradually thinner. Step 4: Cooling and curing: After the extruded PET film passes through the calendering rollers, it needs to be rapidly cooled by the cooling rollers to cure it quickly. Cooling rollers are generally cooled with cooling water to ensure the quality and flatness of the film. Step 5, Stretching and Molding: First, pre-dry the PET resin chips to prevent hydrolysis. Then, extrude the amorphous thick sheets at 280°C through a T-die in an extruder. After being rapidly cooled by a cooling drum or coolant, the sheets maintain their amorphous shape for stretching and orientation. The thick sheets are then bi-directionally stretched by a tenter frame to produce PET films. Step 6, Finished Product Preparation: After slicing the prepared PET film, place it into a mold with raised ribs and concave grooves in a thermoforming machine for thermoforming to obtain a transparent cake tray with alternating raised ribs and concave grooves. Then, it is further processed by processing equipment to remove burrs and excess material to obtain the finished transparent cake tray made of PET material. In the stretching and forming operation in step five, longitudinal stretching involves preheating the thick sheet to 86-87℃ and stretching it approximately three times along the plane of the sheet at this temperature to improve its orientation and crystallinity. The transverse stretching preheats at 98-100℃, stretches at 100-120℃ with a stretching ratio of 2.5-4.0, and heat-sets at 230-240℃. The film after longitudinal and transverse stretching also needs to undergo heat setting to eliminate film deformation caused by stretching, resulting in a film with good thermal stability. Applying efficient ribs and notches improves the process, increases the hardness of the cake tray, effectively holds cakes and pastries, facilitates placement, and also improves processing efficiency.

[0022] like Figures 1-8 As shown, the processing equipment in step six, the finished product preparation, includes a processing table 1, a base material box 2 and a finished product box 3 that are snapped onto the outside of the processing table 1. The processing table 1 is equipped with a feeding component and a ring-cutting component for processing transparent cake trays. The feeding operation is performed on the unprocessed transparent cake trays and the processed transparent cake trays. No manual loading and unloading operation is required, which achieves a high-efficiency processing effect for transparent cake trays. It also achieves a ring-cutting effect on the opening of the transparent cake tray that is exposed in the mold groove 8. It saves time and effort, is highly efficient, and avoids excessive cutting that results in gaps, as well as insufficient cutting that leaves residual material, thus improving the ring-cutting quality of the transparent cake trays. The feeding assembly includes an X-axis electric slide rail 41 located on the outside of the processing table 1, and an X-axis electric slide block 42 sliding on it. The X-axis electric slide block 42 is simultaneously displaced along the X-axis by two X-axis electric slide rails 41. A Y-axis lifting cylinder 43 is fixedly connected to the top of the X-axis electric slide block 42. The two Y-axis lifting cylinders 43 lift and lower along the Y-axis. A Z-axis electric slide rail 44 is fixedly connected to the piston rod on the Y-axis lifting cylinder 43, and a Z-axis electric slide block 45 slides on the Z-axis electric slide rail 44. The Z-axis electric slide block 45 is displaced along the Z-axis by a single Z-axis electric slide rail 44. An angle motor 46 is fixedly connected to the bottom of the Z-axis electric slide 45, and the output shaft of the angle motor 46 is adjusted horizontally to the electric suction cup 48 via the swing arm 47. The angle motor 46 rotates the electric suction cup 48 horizontally via the swing arm 47. The electric suction cup 48, which is adjusted to the position via the three-axis displacement of X, Y and Z axes and horizontal rotation, can perform feeding operations on unprocessed transparent cake trays and processed transparent cake trays. No manual loading and unloading operations are required, achieving a highly efficient processing effect for transparent cake trays. The processing table 1 has arrayed placement slots 8 for placing transparent cake trays, facilitating the placement of the transparent cake trays to be processed. These slots are located below the electric suction cup 48, and the suction cup opening area of ​​the electric suction cup 48 is the same as the bottom area of ​​the transparent cake tray. The suction cup can be moved by adsorbing the bottom of the transparent cake tray. Displacement sensors are fixed on the X-axis electric slide 42 and the Z-axis electric slide 45 to monitor their displacement in real time. The range of the electric suction cup 48 after displacement along the X, Y, and Z axes is the same as the cross-sectional area of ​​the processing table 1, meeting the loading, unloading, and circumferential cutting requirements of the transparent cake trays in the placement slots 8 on the processing table 1. A slide frame 7 is fixedly connected to the inner side of the X-axis electric slide 42, and the slide frame 7 slides and engages with the outer side of the processing table 1. It is located outside the placement slots 8 and acts as a sliding limit for the X-axis electric slide 42, improving the stability of the X-axis axial displacement of the X-axis electric slide 42.

[0023] The ring-cutting assembly includes a flip motor 51 embedded in the swing arm 47, which drives the stop seat 54 on the sealed slide cylinder 52 and the flat cutting blade holder 58 on the stepper motor 56 to flip as a whole, facing the transparent cake tray in the placement mold 8 after being loaded. The sealed slide cylinder 52 is fixed on the output shaft of the flip motor 51, and the stop seat 54 for positioning the transparent cake tray is fixed in the sealed slide cylinder 52 by a T-shaped slide block 53. The stop seat 54 on the T-shaped slide block 53 first stops and positions the transparent cake tray one by one, and a toothed ring 55 is sleeved on the outside of the sealed slide cylinder 52. A stepper motor 56 is provided on the outside of the sealing cylinder 52, and a gear 57 that meshes with the gear ring 55 is provided on the output shaft of the stepper motor 56. The stepper motor 56 drives the gear 57 to make a circular motion around the gear ring 55. A flat cutter holder 58 is fixed for circumferential cutting of the transparent cake tray after positioning by the stop seat 54. The stepper motor 56 also drives the flat cutter holder 58 to rotate and achieve circumferential cutting effect on the opening of the transparent cake tray that is exposed in the mold groove 8. It saves time and effort, is highly efficient, and avoids over-cutting and the phenomenon of gaps, as well as under-cutting and residual material, thus improving the circumferential cutting quality of the transparent cake tray. The inner cavity of the sealing slide cylinder 52 is fitted with a buffer spring 9 that is fixedly matched with the T-shaped slide block 53, which plays the role of elastic buffering and elastic reset for the T-shaped slide block 53. The stop seat 54 and the placement mold groove 8 are both designed with concave openings that match the protrusions on the transparent cake tray. The stop seat 54 fully stops and positions the transparent cake tray placed in the placement mold groove 8. The outer side of the sealing slide cylinder 52 near the gear ring 55 is fitted with a sliding edge 10, and a sliding cover box 11 that is fixedly protected to the gear 57 and the stepper motor 56 is slidably connected to the sliding edge 10. When the stepper motor 56 drives the gear 57 to make a circular motion around the gear ring 55, it also drives the sliding cover box 11 to rotate in a circular motion on the sliding edge 10 on the sealing slide cylinder 52, thereby improving the stability of the circular motion of the stepper motor 56 and the whole.

[0024] like Figures 9-11 As shown, during the processing of rough edges and burr residue at the opening of the thermoplastic-molded transparent cake tray, the opening of the transparent cake tray is relatively soft, which makes it easy for the ring cutting to be incomplete. Therefore, the transparent cake tray cannot be cooled and hardened as a whole based on the positioning of the stop seat 54, which makes the processing quality of the transparent cake tray unreliable. The bottom of the processing table 1 is equipped with a hardening component that is used in conjunction with the transparent cake tray placed in the mold trough 8. The hardening component includes a small integrated heating and cooling machine 61 fixed on one side of the processing table 1. The rear side of the small integrated heating and cooling machine 61 is connected to an electric control valve 62 with a temperature sensor 63 and a small circulation pump 64. The small circulation pump 64 is connected to an air distribution head 65 that is fixedly matched with the processing table 1. The small integrated heating and cooling machine 61 provides the cold source, and the cold source is supplied to the air distribution head 65 through the small circulation pump 64 on the electric control valve 62. The air distribution head 65 is connected to the conveying head 67 by a cross-shaped pipe rack 66 around its perimeter. The processing table 1 has a conveying hole 68 at the bottom near the placement mold trough 8, which communicates with and cooperates with the conveying head 67. The cross-shaped pipe rack 66 supplies the cold source into the transparent cake tray area in the placement mold trough 8 through the conveying hole 68 at the conveying head 67. This cools and hardens the transparent cake tray to be ring-cut, further improving the ring-cutting quality of the flat cutting blade 58 at the opening of the transparent cake tray. This prevents the transparent cake tray opening from being too soft and resulting in incomplete cutting. It also improves the quality of removing burrs and residual material at the opening of the transparent cake tray, reducing the defect rate and rework rate. After the transparent cake tray has been cooled and hardened and the ring-cutting operation is completed, the small integrated cooling and heating machine 61 is controlled to provide a heat source. Similarly, the heat source is supplied into the transparent cake tray area in the placement mold trough 8 through the conveying hole 68 at the conveying head 67. This heats and restores the hardened transparent cake tray after ring-cutting, which is beneficial for subsequent processing operations.

[0025] The working principle of a transparent cake tray preparation method: When the processing equipment in step six processes the transparent cake tray with the alternating design of ribs and recesses, it first controls the two X-axis electric slide rails 41 to open synchronously and drive the two sets of X-axis electric slide blocks 42 to move in the X-axis axial direction, and drives the slide 7 to slide along the edge of the processing table 1. It also controls the two Y-axis lifting cylinders 43 to adjust the Y-axis axial lifting and lowering, and controls the single Z-axis electric slide rail 44 to drive the Z-axis electric slide block 45 to move in the Z-axis axial direction. Then, the angle motor 46 drives the electric suction cup 48 on the swing arm 47 to rotate and move to the position of the transparent cake tray stored in the cake tray box 2. Then, it controls the electric suction cup 48 to adsorb the bottom of the transparent cake tray box stored in it one by one. Similarly, it places the adsorbed transparent cake trays one by one into the placement mold groove 8 on the processing table 1 to complete the feeding and unloading of several transparent cake trays. Next, the flipping motor 51 is turned on and drives the stop seat 54 on the sealing slide cylinder 52 and the flat cutting blade holder 58 on the stepper motor 56 to flip downwards and reach directly above several transparent cake trays placed in the mold slots 8. After the electric suction cup 48 flips upwards, the two Y-axis lifting cylinders 43 are controlled to drive the stop seat 54 on the sealing slide cylinder 52 to move down and stop and position the transparent cake tray currently placed in the mold slot 8. The stopped and positioned transparent cake tray only exposes the opening area above the mold slot 8, and forces the T-shaped slide 53 to slide in the sealing slide cylinder 52 and compresses the buffer spring 9. After the stop seat 54 moves down and positions itself to stop the transparent cake tray, the flat cutting blade holder 58 on the stepper motor 56 also moves down to the exposed opening area of ​​the transparent cake tray. With the sliding edge 10 and sliding cover 11 providing rotational support for the gear 57 and gear ring 55 on the stepper motor 56, the stepper motor 56 is then activated, driving the gear 57 to rotate around the gear ring 55. The rotating stepper motor 56 simultaneously drives the flat cutting blade holder 58, which has moved down to its position, to rotate. The circumferential cutting operation is carried out along the exposed opening area of ​​the transparent cake tray. Similarly, the flat cutting blade 58 stops and positions each of the several placed mold slots 8 one by one through the stop seat 54. After the transparent cake tray is exposed above the opening area of ​​the placed mold slot 8 and all the circumferential cutting operations are completed, after the X-axis, Y-axis and Z-axis and rotational adjustment, the electric suction cup 48 is used to unload the several transparent cake trays that have completed the circumferential cutting operations into the finished product box 3 for storage. During this period, the small integrated heating and cooling unit 61 first generates a cold source, which is monitored in real time by the temperature sensor 63 on the electronically controlled valve 62. Then, the small circulating pump 64 is turned on to supply the cold source into the air distribution head 65. The cold source is then supplied from the conveying head 67 on the cross-shaped pipe rack 66 through the conveying hole 68 to several areas of the uncut transparent cake trays in the mold slots 8. After the uncut transparent cake trays are rapidly cooled and hardened, the stop seat 54 first stops and positions the hardened transparent cake trays. Then, the flat cutting blade 58 is controlled to cut the hardened transparent cake trays in the mold slots 8 one by one. The exposed opening area of ​​the cake tray is circumferentially cut until all the opening areas of the transparent cake trays in this batch are circumferentially cut to obtain the finished transparent cake trays. Then, the small integrated heating and cooling machine 61 is controlled to generate a heat source. Similarly, the small circulating pump 64 supplies the heat source sequentially through the air distribution head 65, the cross-shaped pipe rack 66 and the conveying head 67 through the conveying hole 68 to several circumferentially cut transparent cake tray areas in the mold slots 8. After the cooled and hardened transparent cake trays are heated and restored, the electric suction cup 48 is controlled to unload several circumferentially cut and restored transparent cake trays into the finished product box 3 for storage.

[0026] It should be noted that the specific models and specifications of the X-axis electric slide rail 41, X-axis electric slide block 42, Y-axis lifting cylinder 43, Z-axis electric slide rail 44, Z-axis electric slide block 45, angle motor 46, electric suction cup 48, tilting motor 51, stepper motor 56, small integrated cooling and heating unit 61, electric control valve 62, temperature sensor 63, and small circulating pump 64 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0027] The power supply circuits for the X-axis electric slide rail 41, X-axis electric slide block 42, Y-axis lifting cylinder 43, Z-axis electric slide rail 44, Z-axis electric slide block 45, angle motor 46, electric suction cup 48, tilting motor 51, stepper motor 56, small integrated heating and cooling unit 61, electric control valve 62, temperature sensor 63, and small circulating pump 64 are clear to those skilled in the art and will not be described in detail here.

[0028] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for preparing a transparent cake tray, characterized in that: Includes the following steps: Step 1: Raw material preparation: The main raw material of PET film is polyethylene terephthalate particles. Polyethylene terephthalate is produced by first synthesizing diethyl terephthalate by ester exchange of dimethyl terephthalate and ethylene glycol or by esterification of terephthalic acid and ethylene glycol, and then carrying out a polycondensation reaction. Step 2, Solution Preparation: After pre-drying, the PET granules are heated and melted using an extruder to form a viscous PET film solution. Plasticizers, stabilizers, and antistatic agents are added to the solution to improve the film's performance. Step 3, Plasticizing and Extrusion: The PET film solution is plasticized and extruded through the screw of the extruder to make it into a uniform molten state. The extruder extrudes the film solution through heating and extrusion, and stretches and presses it through the action of multiple calendering rollers to make it gradually thinner. Step 4: Cooling and curing: After the extruded PET film passes through the calendering rollers, it needs to be rapidly cooled by the cooling rollers to cure it quickly. Cooling rollers are generally cooled with cooling water to ensure the quality and flatness of the film. Step 5, Stretching and Molding: First, pre-dry the PET resin chips to prevent hydrolysis. Then, extrude the amorphous thick sheets at 280°C through a T-die in an extruder. After being rapidly cooled by a cooling drum or coolant, the sheets maintain their amorphous shape for stretching and orientation. The thick sheets are then bi-directionally stretched by a tenter frame to produce PET films. Step 6, Finished Product Preparation: After slicing the prepared PET film, place it into a mold with raised ribs and recesses in a thermoforming machine for thermoforming to obtain a transparent cake tray with alternating raised ribs and recesses. Then, it is further processed by processing equipment to remove burrs and excess material, resulting in a finished transparent cake tray made of PET material.

2. The method for preparing a transparent cake tray according to claim 1, characterized in that: In the stretching and forming operation of step five, longitudinal stretching involves preheating the thick sheet to 86-87℃ and stretching it about three times along the plane of the sheet at this temperature to improve its orientation and crystallinity to reach a higher temperature. Transverse stretching involves a preheating temperature of 98-100℃, a stretching temperature of 100-120℃, a stretching ratio of 2.5-4.0, and a heat setting temperature of 230-240℃. The film after longitudinal and transverse stretching also needs to undergo heat setting to eliminate film deformation caused by stretching and produce a film with good thermal stability.

3. The method for preparing a transparent cake tray according to claim 2, characterized in that: The processing equipment in step six of the finished product preparation includes a processing table (1), a base box (2) and a finished product box (3) that are snapped onto the outside of the processing table (1), and the processing table (1) is respectively equipped with a feeding component and a ring cutting component for processing transparent cake base.

4. The method for preparing a transparent cake tray according to claim 3, characterized in that: The feeding assembly includes an X-axis electric slide rail (41) located outside the processing table (1) and an X-axis electric slide block (42) sliding on it. The top of the X-axis electric slide block (42) is fixedly connected to a Y-axis lifting cylinder (43), and a Z-axis electric slide rail (44) is fixedly connected to it via the piston rod on the Y-axis lifting cylinder (43). A Z-axis electric slide block (45) slides on the Z-axis electric slide rail (44), and an angle motor (46) is fixedly connected to the bottom of the Z-axis electric slide block (45). The output shaft of the angle motor (46) is horizontally swung and adjusted by a swing arm (47) to an electric suction cup (48) on it.

5. The method for preparing a transparent cake tray according to claim 4, characterized in that: The ring-cutting assembly includes a flip motor (51) embedded in the swing arm (47), a sealing slide (52) fixed on the output shaft of the flip motor (51), and a stop (54) for positioning the transparent cake tray fixed inside the sealing slide (52) by a T-shaped slide (53), and a gear ring (55) sleeved on the outside of the sealing slide (52). A stepper motor (56) is provided on the outside of the sealing slide (52), and a gear (57) meshing with the gear ring (55) is sleeved on the output shaft of the stepper motor (56), and a flat cutter holder (58) is fixed for ring-cutting the transparent cake tray after the stop (54) is positioned.

6. The method for preparing a transparent cake tray according to claim 5, characterized in that: The processing table (1) is provided with a placement mold groove (8) for placing transparent cake trays, which is located below the electric suction cup (48), and the suction cup opening area of ​​the electric suction cup (48) is the same as the bottom area of ​​the transparent cake tray box.

7. The method for preparing a transparent cake tray according to claim 6, characterized in that: Displacement sensors are fixed on both the X-axis electric slide (42) and the Z-axis electric slide (45), and the range of the electric chuck (48) after displacement along the X-axis, Y-axis and Z-axis is the same as the cross-sectional area of ​​the processing table (1).

8. The method for preparing a transparent cake tray according to claim 7, characterized in that: The inner side of the X-axis electric slide (42) is fixedly connected to the slide (7), and the slide (7) slides with the outer side of the processing table (1) and is located outside the mold groove (8).

9. The method for preparing a transparent cake tray according to claim 8, characterized in that: The inner cavity of the sealing slide (52) is fitted with a buffer spring (9) that is fixedly matched with the T-shaped slide (53), and the stop seat (54) and the placement mold groove (8) are both designed with concave openings that match the convexity on the transparent cake tray.

10. A method for preparing a transparent cake tray according to claim 9, characterized in that: The sealing slide (52) is fitted with a sliding edge (10) on the outer side near the gear ring (55), and a sliding cover (11) is slidably connected to the sliding edge (10) to fix and protect the gear (57) and the stepper motor (56).

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