A laminated paper water replenishment production line

Abstract

The present invention provides a production line for moisturizing coated paper, belonging to the technical field of release paper production. It comprises a frame and a paper traction mechanism. The paper traction mechanism forms multiple straight sections of coated paper on the frame after multiple coatings and curing. At least one moisturizing mechanism is installed in each straight section. After passing through the last moisturizing mechanism, the coated paper is cooled and reeled up in sequence. The moisturizing mechanism comprises a first and second compression unit symmetrically located on either side of the coated paper, compacting the paper to form four distribution areas. One enclosed area is equipped with a water mist nozzle; another enclosed area is equipped with a film surface heater. After heating and humidification, the paper is initially cooled by a pre-cooling cold water roller. The present invention has advantages such as excellent moisturizing uniformity.

Description

Technical Field

[0001] The invention belongs to the technical field of release paper production and relates to a water replenishment production line for laminated paper. Background Art

[0002] In the existing laminated paper after silicon coating and oven curing, the common processes for replenishing water to the paper include roller replenishing, steam replenishing and disk replenishing. Different replenishing methods have their own advantages and disadvantages. The uniformity of roller replenishing and disk replenishing is relatively poor, and it will affect the flatness of the paper. This is because these two methods will cause uneven force on the paper to a certain extent. Roller replenishing is to attach water to the paper surface of the laminated paper in a "linear distribution" manner, and then use the capillary phenomenon of the paper material and the squeezing of the roller to make the water overflow on the paper surface. This will make the paper surface receive water in sequence and the water content will also be different. Although the water content of each part of the paper surface can be close after overflow, the water The difference in residence time in different areas of the paper surface will cause the difference in paper stress, thus affecting the flatness of the paper. The same is true for water replenishment with a spinner. Water acts on the paper surface in a "point distribution" manner and then overflows. The flatness of the paper will also be affected by uneven water distribution and the difference in the order of wetting the paper. In addition to the uniformity of water replenishment, the amount of water replenishment is also critical. One side of the coated paper is the film and the other side is the paper material. When the forces on both sides are equal, the paper is naturally flat. If the water content of the paper surface is too high, the fiber tubes of the paper material will expand, causing the paper to naturally "curl toward the film side". Similarly, if the water content is low, the paper will curl to the other side.

[0003] Hot paper hydration can improve the uniformity of hydration, because the water vapor particles are smaller and can basically be attached to the paper in a "surface" manner. In addition, the higher temperature of water vapor can greatly increase the movement speed of water molecules, the water absorption and permeability of the paper material are enhanced, and the water content uniformity is naturally optimal. The hydration of each area is basically completed simultaneously, and it is not easy to affect the flatness due to the difference in the order of water exposure of the paper. However, under the same tension, the amount of stretching of the paper after heating is greater, especially the stretching effect of the film after heating is very obvious. Therefore, hot paper hydration will cause the paper to stretch, which in turn affects the traction tension, resulting in a series of problems such as offset during paper traction, uneven lateral force, difference in film thickness, poor traction stability, etc. These negative effects add to each other, and errors accumulate and superimpose. The impact on product quality in the continuous production process cannot be ignored. Summary of the Invention

[0004] The purpose of the present invention is to provide a coated paper water replenishment production line in response to the above-mentioned problems existing in the existing technology. The technical problem to be solved by the present invention is how to improve the stability of paper traction during the water replenishment process and improve the uniformity of water replenishment.

[0005] The objectives of the present invention can be achieved by the following technical solutions: A laminated paper water replenishment production line, characterized by comprising a frame and a paper traction mechanism, wherein the paper traction mechanism forms a plurality of straight sections on the frame after the laminated paper has been laminated and cured in batches, and at least one water replenishment mechanism is provided on the straight sections. After the laminated paper passes through the last water replenishment mechanism, it is cooled and wound up in sequence;

[0006] The water replenishing mechanism includes a pressing unit 1 and a pressing unit 2 symmetrically distributed on both sides of the laminated paper, the pressing unit 1 including a guide rail 1 fixed to a frame, a mounting frame 1 slidably connected to the guide rail 1 in a direction perpendicular to the surface of the laminated paper, and a plurality of paper guide rollers 1 rotatably connected to the mounting frame 1; each paper guide roller 1 pulls a driven belt 1 connected end to end, the driven belt 1 has six contact points with the paper surface of the laminated paper, along the moving direction of the laminated paper, the driven belt 1 forms a recessed opening 1 between the second and third contact points, and the driven belt 1 forms a recessed opening 2 between the fourth and fifth contact points, and a water mist nozzle is provided in the recessed opening 1;

[0007] The second pressing unit includes a second guide rail fixed to a frame, a second mounting frame slidably connected to the second guide rail in a direction perpendicular to the surface of the laminated paper, and a plurality of second paper guide rollers rotatably connected to the second mounting frame; each of the second paper guide rollers pulls a second driven belt connected end to end, and the second driven belt has six contact points with the laminated surface of the laminated paper. Along the moving direction of the laminated paper, the second driven belt forms a third recess between the second and third contact points, and forms a fourth recess between the fourth and fifth contact points. A film surface heater is provided in the third recess;

[0008] A plurality of pre-cooling cold water rollers are provided in the second and fourth recessed openings;

[0009] A tension spring is provided between the first mounting frame and the second mounting frame to drive the two toward each other.

[0010] Furthermore, the pre-cooling cold water roller is a hollow structure, and the hollow cavity of the pre-cooling cold water roller is filled with flowing cooling water.

[0011] Furthermore, the mounting frame includes two vertical flat plates, each paper guide roller connects the two vertical flat plates; the inner side surfaces of the two vertical flat plates, the inner side surface of the driven belt and the paper surface of the coated paper form a closed space.

[0012] Furthermore, the mounting frame 2 includes two vertical flat plates 2, and each paper guide roller 2 connects the two vertical flat plates 2; the inner side surfaces of the two vertical flat plates 2, the inner side surface of the driven belt 2 and the coated surface of the coated paper form a closed space.

[0013] The paper is humidified and pre-cooled while being clamped by the driven belt 1 and the driven belt 2. The driven belt 1 and the driven belt 2 clamp the paper at six contact points with the paper. The paper is first hot-humidified and then pre-cooled. This method can not only utilize the moisture uniformity of hot paper humidification, but also avoid the increase in the amount of paper stretching due to heat, which affects the reduction of paper traction tension.

[0014] Specifically: driven belt 1 and driven belt 2 each have six contact points against both sides of the paper, driven belt 1 and driven belt 2 are synchronized, and the linear speed of driven belt 1 and driven belt 2 is consistent with the linear speed when the paper enters. During the heating and humidification process, the stretching or contraction of the paper due to temperature changes will not be reflected on the paper being transported outside the water replenishment mechanism, and therefore will not affect the tension of the paper outside the water replenishment mechanism; furthermore, since the paper is pre-cooled immediately after being heated and watered, the difference between the paper temperature and room temperature is reduced, so that there will be no obvious difference in the amount of stretching when the paper enters the traction position outside the water replenishment mechanism. The difference in stretching here is the difference in the amount of stretching of the paper before and after water replenishment under the same tension.

[0015] In addition, since the humidification area and the heating area are separated by paper, although a large seal cannot be made, it can effectively prevent water vapor from entering the heating area. At the same time, the film surface of the paper is heated, and water is absorbed on the paper surface, which can make the temperature of the paper surface more uniform.

[0016] A multi-stage water replenishment method is adopted and carried out in batches to avoid excessive water replenishment in a single time, which will greatly affect the physical properties of the paper and thus have a negative impact on the traction of the paper and the performance of the paper itself. Small amounts of water replenishment multiple times can not only minimize the impact on the paper during the water replenishment process, but also the subsequent water replenishment action can be adjusted according to the previous water replenishment situation, so that the paper meets the water replenishment requirements after the water replenishment is completed.

[0017] The heating zone, water replenishment zone and pre-cooling zone are well separated, which reduces energy consumption and water consumption. The water vapor spraying direction does not need to be aimed at the paper surface, and has good water absorption performance when the paper is heated. Moreover, when the paper moves, the Bernoulli effect will drive the steam airflow or atomized water vapor close to the paper. If the air is sprayed directly at the paper, it will cause uneven force on the paper, thereby affecting the flatness of the paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the water replenishment production line and the laminating production line (only one laminating unit is shown).

[0019] Figure 2 It is a structural diagram of the water replenishment production line.

[0020] Figure 3 It is a structural diagram of the water replenishment mechanism.

[0021] Figure 4 It is a schematic diagram of the internal structure of the water replenishment mechanism (showing driven belt 1 and driven belt 2).

[0022] In the figure, 1. Frame; 2. Water replenishment mechanism; 31. Guide rail 1; 32. Mounting frame 1; 33. Paper guide roller 1; 34. Driven belt 1; 35. Recess 1; 36. Recess 2; 37. Water mist nozzle; 41. Guide rail 2; 42. Mounting frame 2; 43. Paper guide roller 2; 44. Driven belt 2; 45. Recess 3; 46. Recess 4; 47. Film surface heater; 48. Pre-cooling cold water roller; 5. Tension spring. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1 and Figure 2 As shown, the laminated paper water replenishment production line is located after the laminating unit and includes a frame 1 and a paper traction mechanism. The paper traction mechanism forms multiple straight sections on the frame 1 after multiple laminations and curing of the laminated paper. At least one water replenishment mechanism 2 is provided on the straight sections. After passing through the last water replenishment mechanism 2, the laminated paper is cooled and wound up in sequence.

[0025] like Figure 3 and Figure 4 As shown, the water replenishment mechanism 2 includes a pressing unit 1 and a pressing unit 2 symmetrically distributed on both sides of the laminated paper. The pressing unit 1 includes a guide rail 31 fixed to the frame 1, a mounting frame 32 slidably connected to the guide rail 31 in a direction perpendicular to the surface of the laminated paper, and a plurality of paper guide rollers 33 rotatably connected to the mounting frame 32; each paper guide roller 33 pulls a driven belt 34 connected end to end, and the driven belt 34 has six contact points with the paper surface of the laminated paper. Along the moving direction of the laminated paper, the driven belt 34 forms a recess 35 between the second and third contact points, and a recess 2 36 between the fourth and fifth contact points. A water mist nozzle 37 is provided in the recess 35;

[0026] The second pressing unit includes a second guide rail 41 fixed to the frame 1, a second mounting frame 42 slidably connected to the second guide rail 41 in a direction perpendicular to the surface of the laminated paper, and a plurality of second paper guide rollers 43 rotatably connected to the second mounting frame 42. Each second paper guide roller 43 pulls a second driven belt 44 connected end to end. The second driven belt 44 has six contact points with the laminated surface of the laminated paper. Along the direction of movement of the laminated paper, the second driven belt 44 forms a third recess 45 between the second and third contact points, and a fourth recess 46 between the fourth and fifth contact points. A film surface heater 47 is provided in the third recess 45.

[0027] Several pre-cooling cold water rollers 48 are provided in the second recess 36 and the fourth recess 46;

[0028] A tension spring 5 is provided between the first mounting frame 32 and the second mounting frame 42 to drive the two toward each other.

[0029] The pre-cooling water roller 48 is a hollow structure, and the hollow cavity of the pre-cooling water roller 48 is filled with flowing cooling water.

[0030] The mounting frame 32 includes two vertical flat plates 1, and each paper guide roller 33 connects the two vertical flat plates 1; the inner side surfaces of the two vertical flat plates 1, the inner side surface of the driven belt 34 and the paper surface of the coated paper form a closed space.

[0031] The mounting frame 2 42 includes two vertical flat plates 2, and each paper guide roller 2 43 connects the two vertical flat plates 2; the inner side surfaces of the two vertical flat plates 2, the inner side surface of the driven belt 2 44 and the coated surface of the coated paper form a closed space.

[0032] The paper is humidified and pre-cooled while being clamped by the driven belt 1 34 and the driven belt 2 44. The driven belt 1 34 and the driven belt 2 44 clamp the paper at six contact points with the paper, firstly performing thermal humidification and then pre-cooling. This method can not only utilize the moisture uniformity characteristic of hot paper humidification, but also avoid the increase in the amount of thermal stretching of the paper, which affects the reduction of the paper traction tension.

[0033] Specifically, the driven belt 1 34 and the driven belt 2 44 each have six contact points against the two side surfaces of the paper, the driven belt 1 34 and the driven belt 2 44 are synchronized, and the linear speed of the driven belt 1 34 and the driven belt 2 44 is consistent with the linear speed of the paper when it enters. During the heating and humidification process, the stretching or contraction of the paper due to temperature changes will not be reflected on the paper being transported outside the water replenishment mechanism 2, and thus will not affect the tension of the paper outside the water replenishment mechanism 2; furthermore, since the paper is pre-cooled immediately after being heated and hydrated, the difference between the paper temperature and the room temperature is reduced, so that there will be no obvious difference in the amount of stretching when the paper enters the traction position outside the water replenishment mechanism 2. The stretching difference mentioned here is the difference in the amount of stretching of the paper before and after hydration under the same tension.

[0034] In addition, since the humidification area and the heating area are separated by paper, although a large seal cannot be made, it can effectively prevent water vapor from entering the heating area. At the same time, the film surface of the paper is heated, and water is absorbed on the paper surface, which can make the temperature of the paper surface more uniform.

[0035] A multi-stage water replenishment method is adopted and carried out in batches to avoid excessive water replenishment in a single time, which will greatly affect the physical properties of the paper and thus have a negative impact on the traction of the paper and the performance of the paper itself. Small amounts of water replenishment multiple times can not only minimize the impact on the paper during the water replenishment process, but also the subsequent water replenishment action can be adjusted according to the previous water replenishment situation, so that the paper meets the water replenishment requirements after the water replenishment is completed.

[0036] The heating zone, water replenishment zone and pre-cooling zone are well separated, which reduces energy consumption and water consumption. The water vapor spraying direction does not need to be aimed at the paper surface, and has good water absorption performance when the paper is heated. Moreover, when the paper moves, the Bernoulli effect will drive the steam airflow or atomized water vapor close to the paper. If the air is sprayed directly at the paper, it will cause uneven force on the paper, thereby affecting the flatness of the paper.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A laminated paper moisturizing production line, characterized in that: The invention comprises a frame (1) and a paper traction mechanism, wherein the paper traction mechanism forms a plurality of straight sections on the frame (1) after the coated paper has been coated multiple times and solidified in batches, and at least one water replenishing mechanism (2) is provided at the straight sections, and the coated paper is cooled and rolled up in sequence after passing through the last water replenishing mechanism (2); The water replenishing mechanism (2) includes a pressing unit 1 and a pressing unit 2 symmetrically distributed on both sides of the laminated paper, the pressing unit 1 includes a guide rail 1 (31) fixed on the frame (1), a mounting frame 1 (32) slidably connected to the guide rail 1 (31) in a direction perpendicular to the surface of the laminated paper, and a plurality of paper guide rollers 1 (33) rotatably connected to the mounting frame 1 (32); each paper guide roller 1 (33) is pulled by a driven belt 1 (34) connected end to end, the driven belt 1 (34) has six contact points with the paper surface of the laminated paper, along the moving direction of the laminated paper, the driven belt 1 (34) forms a recessed opening 1 (35) between the second contact point and the third contact point, and the driven belt 1 (34) forms a recessed opening 2 (36) between the fourth contact point and the fifth contact point, and a water mist nozzle (37) is provided in the recessed opening 1 (35); The second pressing unit comprises a second guide rail (41) fixed on the frame (1), a second mounting frame (42) slidably connected to the second guide rail (41) in a direction perpendicular to the surface of the laminated paper, and a plurality of second paper guide rollers (43) rotatably connected to the second mounting frame (42); each second paper guide roller (43) is pulled by a second driven belt (44) connected end to end, and the second driven belt (44) has six contact points with the laminated surface of the laminated paper. Along the moving direction of the laminated paper, the second driven belt (44) forms a third recess (45) between the second contact point and the third contact point, and forms a fourth recess (46) between the fourth contact point and the fifth contact point. A film surface heater (47) is provided in the third recess (45); A plurality of pre-cooling cold water rollers (48) are provided in the second recess (36) and the fourth recess (46); A tension spring (5) is provided between the first mounting frame (32) and the second mounting frame (42) to drive the two toward each other.

2. A laminated paper moisturizing production line according to claim 1, characterized in that: The pre-cooling cold water roller (48) is a hollow structure, and the hollow cavity of the pre-cooling cold water roller (48) is filled with flowing cooling water.

3. A laminated paper moisturizing production line according to claim 1 or 2, characterized in that: The mounting frame (32) includes two vertical flat plates, and each paper guide roller (33) connects the two vertical flat plates; the inner side surfaces of the two vertical flat plates, the inner side surface of the driven belt (34) and the paper surface of the coated paper form a closed space.

4. A laminated paper moisturizing production line according to claim 3, characterized in that: The mounting frame 2 (42) includes two vertical flat plates 2, and each paper guide roller 2 (43) connects the two vertical flat plates 2; the inner side surfaces of the two vertical flat plates 2, the inner side surface of the driven belt 2 (44) and the coated surface of the coated paper form a closed space.

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