A uniform forming apparatus for a facing vacuum panel

Abstract

This utility model discloses a surface layer vacuum panel uniform forming device, including a forming wire, guide rollers, breast rollers, headbox, a first scraper dewatering component, a second scraper dewatering component, a passive negative pressure dewatering component, a first active negative pressure dewatering component, a second active negative pressure dewatering component, a vacuum dewatering component, and a water receiving basin; the water receiving basin is located below the two breast rollers; the inner components of the first and second active negative pressure dewatering components are connected to a first vacuuming component, and the inner components of the vacuum dewatering component are connected to a second vacuuming component; a step-by-step dewatering gradient is formed by the first scraper dewatering component, the second scraper dewatering component, the passive negative pressure dewatering component, the first active negative pressure dewatering component, the second active negative pressure dewatering component, and the vacuum dewatering component, corresponding to the moisture content and flow state of the pulp when passing through, thereby effectively achieving efficient dewatering and resulting in high uniformity of the dewatered pulp surface layer, improving product quality.

Description

Technical Field

[0001] This utility model relates to the papermaking field, specifically to a device for uniformly forming a vacuum panel surface. Background Technology

[0002] As people's living standards improve, their requirements for product packaging are also increasing. Now, people not only require packaging to be sturdy, but also to print various information about the contents and some exquisite pictures on the outer packaging. Uniformly shaped paper often brings better printing and appearance effects, and the strength index of the paper will be more uniform, resulting in better performance. However, the paper produced by existing equipment is not uniform enough, with the basis weight deviation reaching 2.5 g / m and the basis weight deviation reaching 3.0 g / m2. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a surface vacuum panel uniform forming device, including a forming net, guide rollers, breast rollers, a headbox, a first scraping and dewatering component, a second scraping and dewatering component, a passive negative pressure dewatering component, a first active negative pressure dewatering component, a second active negative pressure dewatering component, a vacuum dewatering component, and a water receiving basin; the breast rollers in pairs are arranged above a plurality of guide rollers, the forming net is wound around the breast rollers and guide rollers, the headbox is located above the breast rollers and its bottom component is close to the forming net; the bottom component of the forming net between the breast rollers is arranged sequentially along the direction of the forming net's movement with the first scraping and dewatering component, the second scraping and dewatering component, the passive negative pressure dewatering component, the first active negative pressure dewatering component, the second active negative pressure dewatering component, and the vacuum dewatering component; the water receiving basin is arranged below the two breast rollers; the inner components of the first active negative pressure dewatering component and the second active negative pressure dewatering component are connected to a first vacuuming component, and the inner component of the vacuum dewatering component is connected to a second vacuuming component.

[0004] Preferably, the first scraper dehydration component, the second scraper dehydration component, the passive negative pressure dehydration component, the first active negative pressure dehydration component, the second active negative pressure dehydration component, and the vacuum dehydration component all include a dehydration chamber, a dehydration panel disposed on the top component, a plurality of scraper strips disposed at intervals on the surface of the dehydration panel, a support plate disposed in the component inside the dehydration chamber, a plurality of threaded posts passing through the support plate, and a height adjustment nut disposed on the threaded posts.

[0005] Preferably, the dewatering panel of the first scraper dewatering assembly is further provided with a forming plate on the side near the headbox.

[0006] Preferably, the inner components of the dehydration tanks of the passive negative pressure dehydration component, the first active negative pressure dehydration component, and the second active negative pressure dehydration component are all equipped with a slow-flow pipe. The bottom component of the slow-flow pipe extends outward through the dehydration tank and is equipped with an overflow cover. The bottom component of the slow-flow pipe extends into the water surface of the inner component of the overflow cover.

[0007] Preferably, the vacuum level of the second vacuum pumping component is greater than that of the first vacuum pumping component.

[0008] Preferably, the forming plate is inclined at -1°, the dehydration panel of the first scraper dehydration component is inclined at 0°, the dehydration panel of the second scraper dehydration component is inclined at 1°, the dehydration panel of the passive negative pressure dehydration component is inclined at 2°, the dehydration panel of the first active negative pressure dehydration component is inclined at 1°, the dehydration panel of the second active negative pressure dehydration component is inclined at 1°, and the dehydration panel of the vacuum dehydration component is inclined at 0°.

[0009] The main technical effects of this utility model are as follows: a progressively increasing dewatering gradient is formed by the first scraper dewatering component, the second scraper dewatering component, the passive negative pressure dewatering component, the first active negative pressure dewatering component, the second active negative pressure dewatering component, and the vacuum dewatering component. This gradient corresponds to the moisture content and flow state of the pulp as it passes through, thereby effectively achieving efficient dewatering and resulting in high uniformity of the pulp surface layer after dewatering. Specifically, the transverse deviation of the paper basis weight is reduced from 2.5 g / m² to 1.5 g / m², and the longitudinal deviation of the paper basis weight is reduced from 3.0 g / m² to 2.0 g / m². The paper formation is more uniform, improving product quality. Attached Figure Description

[0010] Figure 1 This is a structural diagram of the device according to the present invention;

[0011] Figure 2 for Figure 1 Enlarged view of the local components.

[0012] The attached figures are labeled as follows: 11-forming net, 12-guide roller, 13-breast roller, 2-headbox, 3-first scraper dewatering assembly, 31-dewatering box, 32-dewatering panel, 33-scraper strip, 34-support plate, 35-threaded column, 36-height adjusting nut, 37-forming plate, 4-second scraper dewatering assembly, 5-passive negative pressure dewatering assembly, 51-slow flow pipe, 52-overflow cover, 6-first active negative pressure dewatering assembly, 61-first vacuum assembly, 7-second active negative pressure dewatering assembly, 8-vacuum dewatering assembly, 81-second vacuum assembly, 9-water receiving basin. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0014] In this embodiment, it should be understood that the terms "middle", "upper", "lower", "top component", "right side", "left end", "above", "back", "middle component", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] Furthermore, unless otherwise specified in this specific embodiment, the connection or fixing method between components can be the commonly used bolt fixing, pin fixing, or pin connection in the prior art. Therefore, it will not be described in detail in this embodiment.

[0016] This utility model provides a device for uniformly forming a vacuum panel surface layer, such as... Figure 1-2 As shown, the assembly includes a forming net 11, guide rollers 12, breast rollers 13, a headbox 2, a first scraping and dewatering assembly 3, a second scraping and dewatering assembly 4, a passive negative pressure dewatering assembly 5, a first active negative pressure dewatering assembly 6, a second active negative pressure dewatering assembly 7, a vacuum dewatering assembly 8, and a receiving basin 9. Pairs of the breast rollers 13 are positioned above several guide rollers 12. The forming net 11 is wound around the breast rollers 13 and guide rollers 12. The headbox 2 is located above the breast rollers 13, and its bottom assembly is close to the forming net 11. The bottom assembly of the forming net 11 between the breast rollers 13 is sequentially provided with the first scraping and dewatering assembly 3, the second scraping and dewatering assembly 4, the passive negative pressure dewatering assembly 5, the first active negative pressure dewatering assembly 6, the second active negative pressure dewatering assembly 7, and the vacuum dewatering assembly 8 along the direction of the forming net 11's movement. The receiving basin 9... The water basin 9 is positioned below the two breast rollers 13; the inner components of the first active negative pressure dewatering component 6 and the second active negative pressure dewatering component are connected to the first vacuum component 61, and the inner component of the vacuum dewatering component 8 is connected to the second vacuum component. A progressive dewatering gradient is formed through the first scraper dewatering component 3, the second scraper dewatering component 4, the passive negative pressure dewatering component 5, the first active negative pressure dewatering component 6, the second active negative pressure dewatering component 7, and the vacuum dewatering component 8, corresponding to the moisture content and flow state of the pulp as it passes through, thereby effectively achieving efficient dewatering and resulting in high uniformity of the pulp surface layer after dewatering; the transverse deviation of the paper basis weight is reduced from 2.5 g / m² to 1.5 g / m², and the longitudinal deviation of the paper basis weight is reduced from 3.0 g / m² to 2.0 g / m²; the paper formation is more uniform, improving product quality.

[0017] Preferably, the first scraping dehydration component 3, the second scraping dehydration component 4, the passive negative pressure dehydration component 5, the first active negative pressure dehydration component 6, the second active negative pressure dehydration component 7, and the vacuum dehydration component 8 all include a dehydration chamber 31, a dehydration panel 32 disposed on the top component, a plurality of scraping strips 33 disposed at intervals on the surface of the dehydration panel 32, a support plate 34 disposed inside the dehydration chamber 31, a plurality of threaded posts 35 passing through the support plate 34, and a height adjusting nut 36 disposed on the threaded posts 35. By adjusting the height adjusting screw, the height of the dehydration chamber 31 and the dehydration panel 32 can be adjusted, thereby getting closer to the forming mesh 11 and generating downward pressure on the forming mesh 11, which is beneficial to improving and maintaining the vacuum degree.

[0018] Preferably, the dewatering panel 32 of the first scraper dewatering component 3 is also provided with a forming plate 37 on the side near the headbox 2, which is used to receive the pulp that just flowed out of the headbox 2, so that the flow rate of the pulp is slowed down.

[0019] Preferably, the inner components of the dewatering chamber 31 of the passive negative pressure dewatering component 5, the first active negative pressure dewatering component 6, and the second active negative pressure dewatering component 7 are all equipped with a slow-flow pipe 51. The bottom component of the slow-flow pipe 51 extends outward through the dewatering chamber 31 and is equipped with an overflow cover 52. The bottom component of the slow-flow pipe 51 extends into the water surface of the inner component of the overflow cover 52, thereby forming a communication between the slow-flow pipe 51 and the overflow cover 52. There is no air in the slow-flow pipe 51, and when the water in the slow-flow pipe 51 overflows from the overflow cover 52, a negative pressure is formed in the inner components of the dewatering chamber 31, and more water is absorbed from the pulp by the negative pressure, thereby achieving negative pressure dewatering.

[0020] Preferably, the vacuum level of the second vacuum pumping component 81 is greater than that of the first vacuum pumping component 61.

[0021] Preferably, the forming plate 37 is inclined at -1°, the dehydration panel 32 of the first scraping and dehydrating component 3 is inclined at 0°, the dehydration panel 32 of the second scraping and dehydrating component 4 is inclined at 1°, the dehydration panel 32 of the passive negative pressure dehydrating component 5 is inclined at 2°, the dehydration panel 32 of the first active negative pressure dehydrating component 6 is inclined at 1°, the dehydration panel 32 of the second active negative pressure dehydrating component 7 is inclined at 1°, and the dehydration panel 32 of the vacuum dehydrating component 8 is inclined at 0°.

[0022] Forming step 1: Pulp is fed into the internal components of the headbox, and the pulp is evenly distributed onto the forming wire after passing through the headbox;

[0023] Step 2: The pulp moves forward with the forming wire and passes through the first scraper dewatering component of the bottom component of the forming wire. The top component panel angle of the first scraper dewatering component is set to 0°, so that the first scraper dewatering component scrapes water from the bottom component of the forming wire, thereby achieving a large amount of dewatering. The top component panel angle of the first scraper dewatering component is set to 0° to stabilize the pulp flow and avoid excessive pulp flow ripples.

[0024] Step 3: The pulp passes through the second scraper dewatering component along with the forming wire. The top panel angle of the second scraper dewatering component is set between 0.5° and 5° to facilitate dewatering while creating turbulence in the pulp, increasing the amount of water removed, and preventing the fibers from re-agglomerating.

[0025] Step 4: The pulp passes through the passive negative pressure dewatering component along with the forming wire. The bottom component of the passive negative pressure dewatering component is equipped with a slow flow tube. The bottom component of the slow flow tube extends into the water, so that there is no air in the slow flow tube, so that the slow flow tube can function as a communicating vessel. As the water flows down the slow flow tube, it creates negative pressure in the inner component of the passive negative pressure dewatering component, thereby realizing passive negative pressure dewatering.

[0026] Step 5: The pulp passes through the first active negative pressure dewatering component and the second active negative pressure dewatering component along with the forming wire. The inner components of the first active negative pressure dewatering component and the second active negative pressure dewatering component are respectively connected to a first vacuum component with low negative pressure. The bottom components of the first active negative pressure dewatering component and the second active negative pressure dewatering component are equipped with a slow flow tube. At this time, the moisture content of the pulp has been greatly reduced. It is necessary to increase the negative pressure suction through the slow flow tube and the first vacuum component to increase the dewatering effect.

[0027] Step 6: The pulp passes through the vacuum dewatering assembly along with the forming wire. The inner component of the vacuum dewatering assembly is connected to a second vacuum assembly with high negative pressure, which is used for forced dewatering under vacuum negative pressure at the end to improve the degree of dewatering.

[0028] The main technical effects of this utility model are as follows: a progressively increasing dewatering gradient is formed by the first scraper dewatering component, the second scraper dewatering component, the passive negative pressure dewatering component, the first active negative pressure dewatering component, the second active negative pressure dewatering component, and the vacuum dewatering component. This gradient corresponds to the moisture content and flow state of the pulp as it passes through, thereby effectively achieving efficient dewatering and resulting in high uniformity of the pulp surface layer after dewatering. Specifically, the transverse deviation of the paper basis weight is reduced from 2.5 g / m² to 1.5 g / m², and the longitudinal deviation of the paper basis weight is reduced from 3.0 g / m² to 2.0 g / m². The paper formation is more uniform, improving product quality.

Claims

1. A device for uniformly forming a vacuum panel surface layer, characterized in that, The apparatus includes a forming mesh, guide rollers, breast rollers, a headbox, a first scraping and dewatering assembly, a second scraping and dewatering assembly, a passive negative pressure dewatering assembly, a first active negative pressure dewatering assembly, a second active negative pressure dewatering assembly, a vacuum dewatering assembly, and a water receiving basin. Pairs of breast rollers are positioned above several guide rollers. The forming mesh is wound around the breast rollers and guide rollers. The headbox is located above the breast rollers, with its bottom assembly close to the forming mesh. Along the direction of the forming mesh's movement, the bottom assembly of the forming mesh between the breast rollers is sequentially equipped with the first scraping and dewatering assembly, the second scraping and dewatering assembly, the passive negative pressure dewatering assembly, the first active negative pressure dewatering assembly, the second active negative pressure dewatering assembly, and the vacuum dewatering assembly. The water receiving basin is positioned below the two breast rollers. The inner components of the first and second active negative pressure dewatering assemblies are connected to a first vacuum assembly, and the inner component of the vacuum dewatering assembly is connected to a second vacuum assembly.

2. A uniform forming apparatus for a faced vacuum panel as defined in claim 1, characterized in that, The first scraper dehydration component, the second scraper dehydration component, the passive negative pressure dehydration component, the first active negative pressure dehydration component, the second active negative pressure dehydration component, and the vacuum dehydration component all include a dehydration chamber, a dehydration panel disposed on the top component, a plurality of scraper strips disposed at intervals on the surface of the dehydration panel, a support plate disposed on the component inside the dehydration chamber, a plurality of threaded posts passing through the support plate, and a height adjustment nut disposed on the threaded posts.

3. A uniform forming apparatus for a faced vacuum panel as defined in claim 2, wherein, The first scraper dewatering assembly has a forming plate on the side of the dewatering panel near the headbox.

4. A uniform forming apparatus for a faced vacuum panel as defined in claim 1, wherein, The inner components of the dehydration tanks of the passive negative pressure dehydration component, the first active negative pressure dehydration component, and the second active negative pressure dehydration component are all equipped with a slow-flow pipe. The bottom component of the slow-flow pipe extends outward through the dehydration tank and is equipped with an overflow cover. The bottom component of the slow-flow pipe extends into the water surface of the inner component of the overflow cover.

5. A uniform forming apparatus for a faced vacuum panel as defined in claim 1, wherein, The vacuum level of the second vacuum pumping component is greater than that of the first vacuum pumping component.

6. A uniform forming apparatus for a faced vacuum panel as defined in claim 3, wherein, The forming plate is inclined at -1°, the dehydration panel of the first scraper dehydration component is inclined at 0°, the dehydration panel of the second scraper dehydration component is inclined at 1°, the dehydration panel of the passive negative pressure dehydration component is inclined at 2°, the dehydration panel of the first active negative pressure dehydration component is inclined at 1°, the dehydration panel of the second active negative pressure dehydration component is inclined at 1°, and the dehydration panel of the vacuum dehydration component is inclined at 0°.

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