CN110127165B

CN110127165B - Paper tray and processing technology thereof

Info

Publication number: CN110127165B
Application number: CN201910388864.8A
Authority: CN
Inventors: 胡双
Original assignee: Jinghui Packaging Shanghai Co ltd
Current assignee: Jinghui Packaging Shanghai Co ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2021-06-25
Anticipated expiration: 2039-05-10
Also published as: CN110127165A

Abstract

The invention discloses a paper tray and a processing technology thereof, and relates to the technical field of trays, wherein a digital model pre-designed mode and a component unit standardized production and assembly mode are adopted to be matched for producing the paper tray, the respective structural strength of a tray body and a foot column is improved, the connection structural strength of the foot column and the tray body and the conduction uniformity of load between the foot column and the tray body are improved, and the production operation of the tray body, the production operation of the foot column and the combination production operation of the tray body and the foot column are completed step by adopting an adhesive hot pressing operation mode, so that the production and processing operation time of the paper tray is favorably shortened, the structural strength and the use stability of the paper tray are favorably improved, and the problem that the paper tray is easy to generate split deformation even when bearing heavier objects is solved.

Description

Paper tray and processing technology thereof

Technical Field

The invention relates to the technical field of trays, in particular to a paper tray and a processing technology thereof.

Background

A pallet is a horizontal platform device used as a load bearing device in the process of packaging, stacking, carrying and transporting. The tray mainly comprises a plastic tray, a metal tray, a wood tray, a paper tray and the like, wherein the paper tray is a paper tray which is processed by taking paper pulp and paper boards as raw materials. With the increasing environmental requirements of the whole international market on the trays, the use of paper trays is increasing.

The prior chinese patent with the publication number CN202038514U discloses a cardboard tray, which comprises a tray panel and a tray bottom plate arranged in parallel, and tray legs are clamped and supported between the tray panel and the tray bottom plate. The inner parts of the tray panel and the tray bottom plate are respectively filled with a panel honeycomb paper core and a bottom plate honeycomb paper core, and the panel honeycomb paper core and the bottom plate honeycomb paper core are both made into hexagonal honeycombs; the tray panel and the tray bottom plate are both wrapped with a layer of hard paper board, and the tray stilts are arranged into cylindrical hollow paperboard bodies.

In the prior art, the load is transferred downwards to the tray leg via the tray panel and then to the tray bottom plate via the tray leg, and the load is uniformly stressed on the tray panel and the tray bottom plate. But in the in-service use process, the load transmission between tray panel, tray socle and the tray bottom plate three is not even, and the structural strength of tray socle is lower, when cardboard tray bore great load, leads to tray panel, tray socle and tray bottom plate three to take place the separation easily, leads to the whole deformation that takes place of cardboard tray even, and prior art exists and can improve the part.

Disclosure of Invention

In view of the above technical problems, an object of the present invention is to provide a paper tray, which is configured to form an integral structure by matching a tray body and pillars, and to improve the structural strength of the tray body, and to form the pillars by foot paper boards, so as to achieve the purpose of improving the structural strength and load conduction uniformity of the paper tray, and further achieve the purpose of improving the use stability of the paper tray.

In order to achieve the purpose, the invention provides the following technical scheme: a paper tray comprises a tray body and a foot post for supporting the tray body, wherein the tray body comprises a honeycomb paperboard core, the upper bottom surface and the lower bottom surface of the honeycomb paperboard core are respectively provided with a panel and a bottom plate, and reinforcing plates are wrapped around the panel and the honeycomb paperboard core to form an integral structure; the bottom of the tray body is uniformly provided with a plurality of the socles; the foot post is including setting up to hollow structure's outer post and filling the interior post in the outer post, just interior post is including the foot cardboard that a plurality of laminating set up, and is a plurality of the overall structure that the foot cardboard constitutes is filled in the outer post.

By adopting the technical scheme, the edge covering structure formed by the reinforcing plates achieves the purpose of improving the structural strength of the tray body, the foot columns formed by the foot paper plates have good structural strength and good load conduction characteristics, and the paper tray formed by the tray body and the foot columns has good structural strength and good load conduction characteristics, so that the purpose of improving the use stability of the paper tray is achieved, namely the problem that the paper tray is easy to split and even deform when bearing heavier objects is solved.

The invention is further configured to: the bottom plate is provided with a notch at the mounting position of the foot post, and the foot post is fixedly bonded with the honeycomb paperboard core through the notch; the bottom plate is bent at the notch to form wing plates, the wing plates are fixedly bonded with the corresponding foot posts, and the wing plates and the bottom plate after being fixedly bonded form an L-shaped structure.

Through adopting above-mentioned technical scheme, the pterygoid lamina and the foot post bonding of bottom plate constitute overall structure, and the setting up of pterygoid lamina has both been favorable to improving the bonding fixed strength of foot post, is favorable to improving the structural stability when carrying the paper tray again, is favorable to decomposing simultaneously and evenly fully transmits the load.

The invention is further configured to: the cross section of each reinforcing plate is of an L-shaped structure, and the adjacent reinforcing plates are spliced at the corner positions of the tray body to form bending gaps.

By adopting the technical scheme, the edge covering formed by the reinforcing plate with the L-shaped structure is beneficial to improving the bonding area, so that the aim of improving the structural strength of the tray body is fulfilled; and the arrangement of the bending gap is beneficial to improving the convenience of assembling personnel or processing machinery for splicing and adhering the reinforcing plate.

The invention is further configured to: the bottom of bottom plate bonds and is provided with a plurality ofly the socle, and is a plurality of the socle cooperatees and constitutes the field style of calligraphy structure.

Through adopting above-mentioned technical scheme, the stilt that constitutes field style of calligraphy structure is favorable to improving the stability that the paper tray used, improves the homogeneity of load decomposition conduction simultaneously.

The invention is further configured to: the foot paper boards are closely attached and arranged and are fixedly bonded in the direction perpendicular to the bottom plate, and an inner column formed by the foot paper boards is filled in the outer column in the direction perpendicular to the bottom plate.

Through adopting above-mentioned technical scheme, adopt vertical arrangement and the mode processing inner prop of inseparable bonding foot cardboard, can improve the structural strength of inner prop and the homogeneity of its conduction load, and then be favorable to improving the structural strength of foot prop and the homogeneity of load conduction.

The invention is further configured to: the outer column comprises a circumferential side column body with two opposite opening ends, an end plate is adhered to one end of the circumferential side column body, which is far away from the bottom plate, and the inner column is filled in the circumferential side column body through the opening end of one side of the circumferential side column body, which is close to the bottom plate; the inner column is exposed outside through the opening end of the side of the peripheral column body close to the bottom plate and is fixedly adhered to the bottom surface of the bottom plate.

Through adopting above-mentioned technical scheme, adopt split type structural design, one is the processing operation mode that is favorable to realizing standard module formula, and another is the convenience that is favorable to improving the equipment bonding operation, still is favorable to improving the structural strength of socle simultaneously.

In view of the above technical problems, a second object of the present invention is to provide a paper tray processing process, in which the processing operation of the tray body and the pillars is completed by a bonding and pressing operation, so as to achieve the purpose of improving the structural strength of the paper tray and further improve the stability of the paper tray.

In order to achieve the purpose, the invention provides the following technical scheme: a paper tray processing technology comprises the following steps: s1, cutting a paperboard, preparing a panel, a bottom plate, a reinforcing plate and a honeycomb paperboard core of a tray body, and cutting an outer column and an inner column of a prepared stilt; s2-1, sequentially bonding a panel, a honeycomb paperboard core and a bottom plate, sequentially pressing to form an integral structure, splicing and adhering a reinforcing plate, and pressing to form a tray body; s2-2, firstly, vertically bonding and pressing the leg paper boards in sequence to form an inner column, cutting the paper boards and surrounding the paper boards to bond to form a peripheral column, then filling the inner column into the peripheral column, and bonding and pressing a fixed end plate at an opening end of the peripheral column to form the leg; and S3, forming a notch at a preset position on the bottom plate, bending the bottom plate to form a wing plate, bonding and pressing the stilts to be fixed at the notch, and bonding and pressing the fixed wing plate to form the paper tray.

By adopting the technical scheme, the purpose of improving the operation efficiency of the paper tray is achieved by matching a mode of pre-designing a digital model with a standardized production and assembly mode of a part unit; and the production operation of the tray body, the production operation of the socles and the combination production operation of the tray body and the socles are completed step by adopting the operation mode of bonding and pressing, so that the production and processing operation time of the paper tray is favorably shortened, the structural strength of the paper tray is favorably improved, and the use stability of the paper tray is favorably improved.

The invention is further configured to: in the bonding and pressing operations in the steps S2-1, S2-2, and S3, a thermal pressing machine is used to complete the pressing operation and the heating operation synchronously, the pressing force is set to be 25-50N, and the pressing time is set to be 8-12 min.

By adopting the technical scheme, the processing operation of the tray body and the pillars is completed by adopting the hot pressing operation mode of combining the heating operation and the pressing operation, so that the processing operation time of the paper tray is further shortened, the production operation efficiency is improved, the production quality of the paper tray is improved, and the structural stability of the finished paper tray is improved.

The invention is further configured to: after step S3 is completed, the interval gel time needs to be set, and the interval gel time is set to 20-28 h.

By adopting the technical scheme, the interval gel time is introduced, so that the glue used in the paper tray processing process can be completely gelled, and the production and processing quality of the paper tray can be ensured.

The invention is further configured to: in the process of pressing, a first pressing operation and a second pressing operation need to be performed step by step, the first pressing operation is set to be short and light pressing, and the second pressing operation is set to be long and heavy pressing.

By adopting the technical scheme, the step-by-step pressing action is adopted, namely, the primary pressing action is matched with the secondary pressing action to complete the pressing operation, so that the production and processing time of the paper tray is favorably shortened (the time of the primary pressing action is shorter than that of the secondary pressing action), the quality of the pressing operation is favorably improved, and the purposes of improving the quality of the paper tray, namely the use stability are achieved.

In conclusion, the invention has the following beneficial effects:

one is as follows: the purpose of improving the use stability of the paper tray is achieved by improving the respective structural strength of the tray body and the pillars, simultaneously improving the connecting structural strength of the pillars and the tray body and the conduction uniformity of load between the pillars and the tray body, namely solving the problem that the paper tray is easy to split and even deform when bearing heavier objects;

the second step is as follows: the mode that adopts digital model predesign and the standardized production equipment mode of spare part unit cooperate the use, adopt the operation mode substep of bonding pressfitting to accomplish the production operation of tray body, the production operation of socle and the amalgamation production operation of tray body and socle simultaneously, both do benefit to the production and processing operation time who shortens paper tray, are favorable to improving the structural strength of paper tray again, and then are favorable to improving the stability in utilization of paper tray.

Drawings

FIG. 1 is a schematic view of the general construction of a paper tray;

FIG. 2 is a schematic bottom view of a paper tray;

FIG. 3 is a schematic illustration of an exploded structure of the tray body;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3;

FIG. 5 is a schematic structural view of a stilt;

fig. 6 is a schematic view of a process flow of the paper tray.

Reference numerals: 1. a tray body; 11. a panel; 12. a base plate; 13. a honeycomb paperboard core; 14. a reinforcing plate; 2. a socle; 21. an outer column; 211. a peripheral side column; 212. an end plate; 22. an inner column; 221. a foot board; 3. bending the gap; 4. a grid-shaped structure; 5. an open end; 6. a notch; 7. a wing plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 and 2, a paper tray includes a tray body 1 for bearing a load unit, the tray body 1 is horizontally disposed, a plurality of pillars 2 are uniformly arranged at the bottom of the tray body 1, and the pillars 2 play roles of uniformly transferring load and stably supporting the tray body 1 and the load unit.

Referring to fig. 1 and 3, the tray body 1 includes a honeycomb paperboard core 13 made by integrally cutting a honeycomb board, and a panel 11 and a bottom plate 12 are respectively bonded to the upper top surface and the lower bottom surface of the honeycomb paperboard core 13, that is, the tray body 1 is an integral structure formed by sequentially bonding the panel 11, the honeycomb paperboard core 13 and the bottom plate 12. Reinforcing plates 14 are arranged on the periphery of the integral structure formed by bonding the panel 11 and the honeycomb paperboard core 13, in the embodiment, the number of the reinforcing plates 14 is four, and the cross section of each reinforcing plate 14 is arranged to be an L-shaped structure; that is, each reinforcing plate 14 is adhered to the corresponding side edge, the horizontal surface of the reinforcing plate 14 is adhered and adhered to the upper surface of the face plate 11, and the vertical surface of the reinforcing plate 14 is adhered and adhered to the side surface of the integral structure composed of the face plate 11 and the honeycomb paperboard core 13.

As shown in fig. 3 and 4, the end portions of two adjacent reinforcing plates 14 are abutted and bonded and fixed, and a bending gap 3 is formed at the corner splicing position of the two adjacent reinforcing plates 14 on the panel 11, so that assembling and manufacturing personnel can splice and bond and fix the reinforcing plates 14 conveniently; and the edge covering formed by the reinforcing plate 14 plays a role in improving the structural strength of the tray body 1, so that the aim of improving the overall structural strength of the paper tray is fulfilled.

As shown in fig. 2, the pillars 2 fixed to the bottom of the tray body 1 are engaged to form a grid-shaped structure 4, that is, nine pillars 2 are bonded to the bottom of the tray body 1, and the supporting structure formed by the engagement of the nine pillars 2 not only plays a role of stably supporting the tray body 1, but also plays a role of uniformly transmitting a load.

As shown in fig. 5, the socle 2 includes an outer column 21 configured as a hollow structure and an inner column 22 filled in the outer column 21. The outer column 21 includes a circumferential side column 211 formed by cutting, surrounding, adhering and fixing a cardboard, two opposite ends of the circumferential side column 211 are set as open ends 5, and an end plate 212 is adhered to a position of the circumferential side column 211 away from one open end 5 of the tray body 1, the end plate 212 is parallel to the tray body 1, that is, the circumferential side column 211 and the end plate 212 form a hollow column structure with one open end 5. The inner column 22 includes a plurality of leg boards 221, and the leg boards 221 are arranged and tightly attached along a direction perpendicular to the tray body 1, and then are bonded and fixed to form an integral structure. The inner column 22 is filled in the inner part of the outer column 21 through the opening end 5 of the hollow column structure along the direction vertical to the tray body 1, and the inner column 22 is exposed outside through the opening end 5 and is adhered and fixed with the bottom surface of the bottom plate 12 of the tray body 1.

As shown in fig. 2, in order to further improve the stability of the paper tray and the structural strength, a bottom plate 12 of the tray body 1 is cut at the position where the leg post 2 is installed to form a notch 6, the bottom plate 12 is bent at the position of the notch 6 to form a flap 7, that is, the bottom plate 12 is cut and bent to form the flap 7, and the flap 7 and the bottom plate 12 after bending form an L-shaped structure and are adhered and fixed on the outer side wall of the leg post 2. In this embodiment, four outer wall sides of one leg 2 located at the middle position of the bottom of the tray body 1 are fixedly bonded to the corresponding four wing plates 7, three outer wall sides of 4 legs 2 located at the peripheral edge positions of the tray body 1 are fixedly bonded to the corresponding three wing plates 7, and three outer wall sides of 4 legs 2 located at the peripheral corner positions of the tray body 1 are fixedly bonded to the corresponding two wing plates 7.

The present embodiment is further described below with reference to specific actions:

firstly, cutting and preparing a panel 11, a honeycomb paperboard core 13, reinforcing plates 14 and a bottom plate 12 by assembly production personnel, then sequentially bonding the panel 11, the honeycomb paperboard core 13 and the bottom plate 12, and then splicing and bonding four reinforcing plates 14 at the four sides of the integral structure formed by the panel 11 and the honeycomb paperboard core 13 to form the complete structure of the tray body 1; simultaneously cutting the paper boards, arranging and bonding the paper boards to obtain a peripheral side column 211, filling an inner column 22 obtained by bonding the foot paper boards 221 into the peripheral side column 211, and bonding and fixing an end plate 212 to seal the opening end 5 of one side; nine legs 2 are adhered and fixed at the notches 6 of the corresponding bottom plates 12 according to preset positions, and the wing plates 7 are adhered and fixed with the outer side walls of the corresponding legs 2, so that the paper tray is obtained.

Example two:

referring to fig. 6, a paper tray processing process includes the following steps, firstly, cutting out a paperboard (the paperboard can be made of environment-friendly paperboard or common paperboard) according to the size data of a pre-designed digital model of the paper tray to prepare the plate members required by the tray body 1 and the pillars 2, namely, the panel 11, the honeycomb paperboard core 13, the bottom plate 12 and the reinforcing plate 14 of the tray body 1, and the circumferential side columns 211, the end plates 212 and the leg paperboards 221 of the pillars 2; then respectively completing the splicing combination production operation of the tray body 1 and the socle 2, and finally completing the bonding forming operation of the tray body 1 and the socle 2.

In the process of processing the tray body 1, the bonding operation and the pressing operation of the panel 11, the honeycomb paperboard core 13, the bottom plate 12 and the reinforcing plate 14 are sequentially completed through manpower or a hot pressing machine, and the heating operation is completed at the same time, namely, the hot pressing operation mode is utilized to shorten the bonding forming operation time and improve the bonding forming operation effect. In the process of processing the footer 2, the bonding operation and the thermocompression bonding operation of the footer plate 221 are completed by a worker or a thermocompression bonding machine. In the bonding operation between the tray body 1 and the leg members 2, the bonding operation and the thermocompression bonding operation can be performed manually or by a thermocompression bonding machine. The hot pressing operation mode which is formed by synchronously pressing operation and heating operation is adopted to process the paper tray, thereby being beneficial to improving the overall processing quality of the paper tray and shortening the overall processing time of the paper tray.

When the hot pressing machine is used for synchronously finishing the pressing operation and the heating operation, the pressing force of the hot pressing machine is set to be 25-50N, and the pressing time is set to be 8-12min, so that the processing operation time is shortened to the greatest extent while the processing quality of the paper tray is ensured, and the processing efficiency is improved. After finishing the processing operation of a batch of paper trays, performing interval gelling operation, namely standing the batch of paper trays in a ventilated environment, and setting the interval gelling time to be 20-28h to ensure that the glue used in the process of processing the paper trays is fully solidified.

In the process of hot pressing operation, the first pressing operation and the second pressing operation can be carried out step by step. The first pressing operation is set to be short and light pressing, the second pressing operation is set to be long and heavy pressing, namely, pressing operation with different time lengths and different pressing force is achieved twice through manual work or hot pressing machinery, so that the purpose of improving the processing quality of the paper tray is achieved, and meanwhile, the time of subsequent processing operation is shortened.

s1, cutting paperboards according to a pre-designed digital model of the paper tray, preparing a panel 11, a bottom plate 12, a reinforcing plate 14 and a honeycomb paperboard core 13 of a tray body 1, and simultaneously cutting the paperboards, preparing a leg paperboard 221, a peripheral main body and an end plate 212 of a leg column 2;

s2-1, in the process of processing the tray body 1, firstly, sequentially bonding the panel 11, the honeycomb paperboard core 13 and the bottom plate 12 through hot-pressing operation to form an integral structure, and then, splicing and bonding the reinforcing plate 14 through hot-pressing operation to form the tray body 1 through hot-pressing;

s2-2, in the process of processing the stilt 2, firstly, vertically bonding and pressing the stilt paper boards 221 to form the inner column 22 through hot pressing operation, simultaneously cutting the paper boards and bonding the paper boards to form the peripheral side column 211, then filling the inner column 22 into the peripheral side column 211, and hot pressing and bonding the fixed end plate 212 at one opening end 5 of the peripheral side column 211 to form the stilt 2;

s3, in the process of combining the tray body 1 and the socles 2, cutting and forming notches 6 at preset positions on the bottom plate 12, bending the bottom plate 12 to form wing plates 7, then bonding and pressing the nine socles 2 to be fixed at the corresponding notches 6 through hot pressing operation, and then bonding and hot pressing the fixed wing plates 7 to form the paper tray through pressing.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a paper tray processing technology, this paper tray is including tray body (1) and be used for supporting stilts (2) of tray body (1), its characterized in that: the tray body (1) comprises a honeycomb paperboard core (13), the upper bottom surface and the lower bottom surface of the honeycomb paperboard core (13) are respectively provided with a panel (11) and a bottom plate (12), and the periphery of the integral structure formed by the panel (11) and the honeycomb paperboard core (13) is wrapped with a reinforcing plate (14); a plurality of the socles (2) are uniformly arranged at the bottom of the bottom plate (12) of the tray body (1), and the socles (2) which are bonded and fixed at the bottom of the tray body (1) are matched to form a grid-shaped structure (4); the foot column (2) comprises an outer column (21) which is of a hollow structure and an inner column (22) filled in the outer column (21), the inner column (22) comprises a plurality of foot paper plates (221) which are attached to each other, and the whole structure formed by the foot paper plates (221) is filled in the outer column (21); the plurality of foot paper plates (221) are attached and arranged along the direction vertical to the tray body (1) and are fixedly bonded to form an integral structure, and the inner column (22) is fixedly bonded with the bottom plate (12) of the tray body (1) through the opening end (5) of the outer column (21); the bottom plate (12) is provided with a notch (6) at the mounting position of the socle (2), and the socle (2) is fixedly bonded with the honeycomb paperboard core (13) through the notch (6); the bottom plate (12) is bent at the notch (6) to form a wing plate (7), the wing plate (7) is fixedly bonded with the corresponding stilt (2), and the bonded and fixed wing plate (7) and the bottom plate (12) form an L-shaped structure; the cross section of each reinforcing plate (14) is of an L-shaped structure, and the corner positions of the adjacent reinforcing plates (14) on the tray body (1) are spliced to form bending gaps (3); the horizontal surface of the reinforcing plate (14) and the upper surface and the side surfaces of the vertical surface cladding panel (11) are matched with the tray body (1), and the stilts (2) at the corners of the tray body (1) are arranged opposite to the horizontal surface of the reinforcing plate (14) and matched with the reinforcing tray body (1);

the paper tray processing technology comprises the following steps:

s1, cutting a paperboard, preparing a panel (11), a bottom plate (12), a reinforcing plate (14) and a honeycomb paperboard core (13) of a tray body (1), and cutting and preparing an outer column (21) and an inner column (22) of a leg column (2) at the same time;

s2-1, firstly, sequentially bonding a panel (11), a honeycomb paperboard core (13) and a bottom plate (12), sequentially pressing to form an integral structure, then, splicing and bonding a reinforcing plate (14), and completing the pressing operation and the heating operation of the tray body (1) by adopting a hot pressing machine;

s2-2, firstly, vertically bonding and pressing foot paper boards (221) in sequence to form an inner column (22), simultaneously cutting the paper boards and surrounding the paper boards to bond to form a circumferential side column body (211), then filling the inner column (22) in the circumferential side column body (211), bonding and pressing a fixed end plate (212) at one opening end (5) of the circumferential side column body (211) to form a foot column (2), and finishing the bonding operation and the heating operation of the foot column (2) by adopting a hot pressing machine;

s3, forming a notch (6) in a preset position on the bottom plate (12), bending the bottom plate (12) to form a wing plate (7), then bonding and pressing the stilt (2) to be fixed at the notch (6), bonding and pressing the fixed wing plate (7) to form a paper tray, and finishing the pressing operation and the heating operation of the paper tray by adopting a hot pressing machine;

in the process of pressing, a first pressing operation and a second pressing operation need to be performed step by step, the first pressing operation is set to be short and light pressing, and the second pressing operation is set to be long and heavy pressing.

2. The paper tray processing process according to claim 1, wherein: the outer column (21) comprises a circumferential side column body (211) with two opposite opening ends (5), one end, far away from the bottom plate (12), of the circumferential side column body (211) is provided with an end plate (212) in a bonding mode, and the inner column (22) is filled in the circumferential side column body (211) through the opening end (5) of one side, close to the bottom plate (12), of the circumferential side column body (211); the inner column (22) is exposed to the outside through an opening end (5) of the side of the peripheral side column body (211) close to the bottom plate (12) and is fixedly adhered to the bottom surface of the bottom plate (12).

3. The paper tray processing process according to claim 1, wherein: in the bonding and caulking operations in step S2-1, step S2-2, and step S3, the caulking force is set to 25-50N and the caulking time is set to 8-12 min.

4. The paper tray processing process according to claim 1, wherein: after step S3 is completed, the interval gel time needs to be set, and the interval gel time is set to 20-28 h.