METHOD AND DEVICE FOR PROTECTING PAPER SHEET

Abstract

The present invention relates to a device for protecting paper sheet, including the following. A mist treating system, includes a working cover and a suction port provided on the working cover. A metal base plate is capable of being drawn out from an outlet of the working cover. An inlet and an outlet are provided on the sidewall of the working cover. An insulating layer provided at the top surface of the metal base plate. A sliding rail is provided above the metal base plate. A sprayer is used for applying an atomized deacidification agent to a paper sheet. A discharging electrode is used for discharging to the paper sheet on the insulating layer. The working cover is covered outside of the metal base plate, the insulating layer, the sliding rail, the sprayer, and the discharging electrode. A plasma power supply is used for generating linear plasma.

Claims

1. A device for protecting paper sheet, comprising: a mist treating system, including a working cover and a suction port provided on the working cover; the mist treating system includes a draught fan and an air flow passage, one side of the air flow passage is connected to the draught fan, and the other side of the air flow passage is connected to an induction port on the working cover, a mist suction net is included in an inside of the air flow passage; a metal base plate in a drawer structure capable of being drawn out from an outlet of the working cover in a slidable manner, an inlet and outlet are provided on a sidewall of the working cover; an insulating layer provided at a top surface of the metal base plate; a sliding rail arranged above the metal base plate; a sprayer movable along the sliding rail and used for applying an atomized deacidification agent to a paper sheet; a discharging electrode movable along the sliding rail and used for discharging to the paper sheet on the insulating layer; the working cover being covered outside of the metal base plate, the insulating layer, the sliding rail, the sprayer, and the discharging electrode; and a plasma power supply supplying power to the metal base plate and the discharging electrode, and generating linear plasma.

2. The device for protecting paper sheet according to claim 1, wherein a bearing guide rail is provided in the working cover, and the metal base plate is slidably arranged on the bearing rail, and the bearing guide rail and the sliding rail are horizontally arranged and are perpendicular to each other in space.

3. The device for protecting paper sheet according to claim 1, wherein the sprayer includes: a first slide block movable along the sliding rail; a nozzle fixed on the first slide block and arranged horizontally, the nozzle toward a side of the insulating layer is provided with a slit-shaped discharge outlet along the longitudinal direction of the nozzle.

4. The device for protecting paper sheet according to claim 1, wherein a roller type cleaning brush is provided below a static position of the sprayer.

5. The device for protecting paper sheet according to claim 1, wherein the discharging electrode moves along the sliding rail by a second slide block which the discharging electrode is fixed with.

6. The device for protecting paper sheet according to claim 1, wherein the protecting paper sheet includes a deacidification tank and an atomizer, a liquid inlet of the atomizer is connected to the deacidification tank, and an atomization outlet of the atomizer is connected to the sprayer.

7. The device for protecting paper sheet according to claim 1, wherein the top surface of the insulating layer is provided with a plurality of vacuum suction holes running through to a bottom surface of the metal base plate, and a vacuum tube is embedded in the bottom surface of the metal base plate, side walls of the vacuum tube are connected with the vacuum suction holes, and the vacuum tube is connected with a vacuum pump; an installation groove is provided on the bottom surface of the metal base plate, and the vacuum suction holes are connected to a groove wall of the installation groove, the vacuum tube is embedded in the installation groove.

8. The device for protecting paper sheet according to claim 1, wherein the plasma power supply is an intermediate frequency high voltage power supply with an operating frequency of 1 kHz to 1 MHz, an operating voltage of 0.5-40 kV, and an operating power of 20 W-2 KW.

9. The device for protecting paper sheet according to claim 1, wherein a distance between the discharging electrode and the insulating layer is 0.08 mm-5 mm.

10. The device for protecting paper sheet according to claim 1, characterized in that, an ozone removal pipeline is provided above the sliding rail.

11. A method for protecting paper sheet applying the device according to claim 1, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

12. A method for protecting paper sheet applying the device according to claim 2, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

13. A method for protecting paper sheet applying the device according to claim 3, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

14. A method for protecting paper sheet applying the device according to claim 4, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

15. A method for protecting paper sheet applying the device according to claim 5, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

16. A method for protecting paper sheet applying the device according to claim 6, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

17. A method for protecting paper sheet applying the device according to claim 7, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

18. A method for protecting paper sheet applying the device according to claim 8, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

19. A method for protecting paper sheet applying the device according to claim 9, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

20. A method for protecting paper sheet applying the device according to claim 10, wherein the method comprises: (1) the paper sheet to be protected is placed on the insulating layer, the discharging electrode starts to discharge and moves along the sliding rail, the paper sheet to be protected is treated by the plasma; (2) the sprayer moves along the sliding rail and sprays the atomized deacidification agent onto the surface of the paper sheet treated by the plasma.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0055] FIG. 1 is a schematic diagram of a device for protecting paper sheet of the present invention.

[0056] FIG. 2 is a schematic diagram of the structure of a device for protecting paper sheet of the present invention.

[0057] FIG. 3 is a schematic diagram of the structure of a sprayer.

[0058] FIG. 4 is a schematic diagram of the structure of a sprayer viewed from another angle.

[0059] FIG. 5 is a schematic diagram of the structure of a sprayer and a cleaning brush.

[0060] FIG. 6 is a sectional diagram of a metal base plate, an insulating layer and a vacuum tube.

[0061] FIG. 7 is a schematic diagram of the structure of a draught fan and an air flow passage.

[0062] FIG. 8 is a schematic diagram of the structure a draught fan and an air flow passage viewed from another angle.

DESCRIPTION OF THE EMBODIMENTS

[0063] As shown in FIG. 1, a device for protecting paper sheet in this embodiment includes: a metal base plate 1, an insulating layer 2, a sliding rail holder 3, a sliding rail 4, a second slide block 5, a discharging electrode 6, a discharge driving motor 7, a plasma power supply 8, a first slide block 9, a sprayer 10, a sprayer driving motor 11, a deacidification tank 12, an atomizer 13, a metal base plate moving motor 14, a controller 15, a working cover 16, a cleaning brush 17, an air flow passage 18, a draught fan 19 and an ozone removal pipeline 20. All of the above components can be installed in the chassis 21 to improve integration with easy operation and movement.

[0064] The components of access the controller 15 (the discharge driving motor 7, the plasma power supply 8, the sprayer driving motor 11, the atomizer 13 and the metal base plate moving motor 14) can realize automatic control. Each device can also be controlled separately and manually if necessary. The controller 15 can be a programmable logic controller (PLC), a single chip computer or in other forms to control the working of each component.

[0065] The metal base plate 1, the insulating layer 2, the sliding rail holder 3, the sliding rail 4, the second slide block 5, the discharging electrode 6, the first slide block 9, the sprayer 10 and the cleaning brush 17 are arranged in the working cover 16.

[0066] The discharging electrode 6 and the sprayer 10 can move along the directions of the sliding rail 4 by the first slide block 5 and the second slide block 9 respectively. The metal base plate 1 can move along the horizontal direction perpendicular to the slide rail 4 under the drive of the metal base plate moving motor 14. The discharging electrode 6 and the sprayer 10 are initially located at both ends of the sliding rail 4.

[0067] Combining with FIG. 1, the specific structure of this embodiment is shown in FIGS. 2-8. The device for protecting paper sheet of this embodiment includes a chassis 21, which is provided with:

[0068] a mist treating system, including a working cover 16 and a suction port provided on the working cover; and a draught fan 19 and an air flow passage 18, one side of the air flow passage 18 is connected to the draught fan 19, and the other side of the air flow passage is connected to the induction port on the working cover 16;

[0069] metal base plate 1, slidably provided in the chassis 21; the sidewall of the chassis 21 provides the inlet and outlet of the metal base plate 1;

[0070] an insulating layer 2, provided at the top surface of the metal base plate 1;

[0071] a sliding rail 4, provided above the metal base plate 1 through the sliding rail holder 3;

[0072] a sprayer 10, fixed on the first slide block 9 and movable along the sliding rail 4 for applying an atomized deacidification agent to the sample on the insulating layer 2;

[0073] a discharging electrode 6, fixed on the second slide block 5 and movable along the sliding rail 4 to form an electric field with the metal base plate 1 for discharging the sample on the insulating layer 2;

[0074] a plasma power supply 8, supplying power to the metal base plate 1 and the discharge electrode 6, generating a linear plasma.

[0075] a deacidification tank 12, connected to the sprayer 10 through the atomizer 13 and the corresponding pipeline.

[0076] A bearing guide rail is provided in the chassis 21. The metal base plate 1 is slidably provided on the bearing rail. The bearing guide rail and the sliding rail 4 are horizontally arranged and perpendicular to each other in space.

[0077] The sprayer 10 includes the nozzle 1001 fixed on the first slide block 9 and arranged horizontally. A slit-shaped discharge outlet 1002 is provided to the nozzle 1001 toward the side of the insulating layer 2 along the length direction of the nozzle. There are three nozzles 1001 are arranged side by side.

[0078] The roller type cleaning brush 17 is provided below the static position of the sprayer 10.

[0079] The top surface of the insulating layer 2 is provided with a plurality of vacuum suction holes 101 running through to the bottom of the metal base plate 1. A installation groove 102 is provided on the bottom surface of the metal base plate 1. The vacuum suction holes 101 are connected to the groove wall of the installation groove 102. A vacuum tube 103 is embedded in the installation groove 102 and connected to the groove wall of the installation groove 102, and the vacuum tube 103 is connected with a vacuum pump 104. The vacuum pump 104 can be mounted either inside the chassis 21 or connected through an external vacuum line.

[0080] The mist treating system includes a working cover 16 and a suction port provided on the working cover; and a draught fan 19 and an air flow passage 18. One side of the air flow passage 18 is connected to the draught fan 19, and the other side of the air flow passage is connected to the induction port on the working cover 16. A mist suction net 1801 is filled in the air passage 18. The mist suction net 1801 is a three-dimensional porous filter net woven by composite metal wires and filled in the air passage 18, wherein, the diameter of the mist suction net is 0.5 mm-3 mm.

[0081] In order to remove ozone generated during discharge, an ozone removal pipeline 20 is provided above the sliding rail 4. The ozone is removed by heating at 40-300 C.

[0082] In order to improve safety, a safety switch triggered by the reset of the metal base plate 1 is extended out of the chassis 21. After the safety switch is triggered, the whole device for protecting paper sheet is powered on. That is, when the metal base plate 1 is detected, all the components are in the power off state to improve safety. The whole device for protecting paper sheet resumes power supply only after the metal base plate is reset. Specifically, contactors or relays can be provided on the power supply circuit of the device for protecting paper sheet, and controlled by the signal of safety switch.

[0083] The device for protecting paper sheet is used for the operation of the following embodiment.

Embodiment 1

[0084] (1) The metal base plate 1 is first extended out from the inlet and outlet of the sidewall of the chassis 21. Place the paper sheet to be protected on the insulating layer 2, and start the metal base plate moving motor 14 to move the metal base plate 1 directly below the sliding rail 4.

[0085] (2) Open the vacuum pump to make the paper sheet spreading on the insulation board and keep it for 1 minute. Turn on the plasma power supply 8 and open the ozone removal pipeline 20. The heating temperature of the ozone removal pipeline 20 is 40 C., the operating frequency is 15 kHz, the operating voltage is 2 kV, and the operating power is 200 W. The discharge electrode 6 starts to discharge, forming a stable blue-purple filamentary plasma. The discharge electrode 6 is controlled by the discharge driving motor 7 to move back and forth along the sliding rail 4. The full range of scanning of the paper sheet is carried out by using the plasma. The scanning time is 1 minute. After the plasma treatment is completed, close the ozone removal pipeline 20.

[0086] In this embodiment, the distance between the discharge electrode and the insulating layer is 2.5 mm.

[0087] (3) After the plasma treatment, the deacidification liquid in the deacidification tank 12 is atomized by the atomizer 13 and is sprayed uniformly on the sample through the sprayer 10.

[0088] Inject the Mg(HCO.sub.3).sub.2 aqueous solution, which has a pH value of 8.2, into the deacidification tank 12. Spray the atomized deacidification agent generated by the atomizer 13 on the sample uniformly with a flow rate at 100 mL/h by using the sprayer 10 controlled by the sprayer driving motor 11. The spraying time is 50 seconds. After the spray finished, the metal base plate moving motor 14 drives the metal base plate 1 to move out from the below of the sliding rail 4. Then the sample is removed.

[0089] When the atomizer 13 starts to work, starting the draught fan 19 at a low speed until the end of the spray. Then adjust the speed of the draft fan 19 to high speed and maintain for 20 seconds.

[0090] After spraying, the sprayer 10 is returned to the initial end of the sliding rail 4, and the cleaning brush 17 below the initial end which is used for cleaning the slit-shaped discharge outlet starts to work.

[0091] In order to quantify the protective effect and to judge the effect of protective treatment on paper sheet, the pH value is measured according to standard procedures, the pH value and the total number of bacterial colonies of the paper sheet treated by hygrothermal aging are measured according to the standard procedure (according to the national standard GB/T 22894-2008).

[0092] After the protective treatment, the total number of bacterial colonies of the paper sheet is changed from 2564 cfu/g to 386 cfu/g.

[0093] After protective treatment, the pH value of the paper sheet is changed from 5.6 (acidity) to 7.8 (alkalinity). After hygrothermal aging, the pH value of the paper sheet is 7.6.

Embodiment 2-5

[0094] The operation steps of embodiments 2-5 are the same as those of embodiment 1. The parameters of the plasma power supply, the distance between the discharge electrodes and the insulating layer are shown in table 1. In order to quantify the protective effect and to judge the effect of protective treatment on the paper sheet, the pH value is measured according to standard procedures, the pH value and the total number of bacterial colonies of the paper sheet treated by hygrothermal aging are measured according to the standard procedure (according to the national standard GB/T 22894-2008). The results are shown in Table 1.

TABLE-US-00001 TABLE 1 the distance the total the the the between number the total operating operating operating the of number of frequency power of voltage of discharge bacterial bacterial of the the the electrode the pH the pH the pH colonies colonies plasma plasma plasma and the value value value before after power power power insulating before after after hygrothermal hygrothermal supply supply supply layer protective protective hygrothermal aging aging (kHz) (W) (kV) (mm) treatment treatment aging (cfu/g) (cfu/g) Embodiment 2 5 150 0.8 1 4.6 7.5 7.5 3864 204 Embodiment 3 20 300 1 2 5.2 8.0 7.4 2365 415 Embodiment 4 8 500 15 3 5.5 7.7 7.4 3532 489 Embodiment 5 50 1000 20 4 4.8 8.3 8.0 4572 213

Comparative Embodiment 1

[0095] The device and samples used in this comparative embodiment are the same as those in embodiment 1. The difference lies in the following steps in the using process

[0096] (1) The metal base plate 1 is firstly extended from the inlet and outlet of the sidewall of the chassis 21. Place the paper sheet to be protected on the insulating layer 2. Start the base plate moving motor 14 to move the metal base plate 1 directly below the sliding rail 4.

[0097] (2) Open the vacuum pump to make the paper sheet spreading on the insulation board and keep it for 1 minute.

[0098] The deacidification liquid in the deacidification tank 12 is atomized by the atomizer 13 and is sprayed uniformly on the sample through the sprayer 10.

[0099] Inject the Mg(HCO.sub.3).sub.2 aqueous solution, which has a pH value of 8.2 into the deacidification tank 12. Spray the atomized deacidification agent generated by the atomizer 13 on the sample uniformly with a flow rate at 100 mL/h by using the sprayer 10 controlled by the sprayer driving motor 11. The spraying time is 50 seconds.

[0100] After spraying, the sprayer 10 is returned to the initial end of the sliding rail 4, and the cleaning brush 17 below the initial end which is used for cleaning the slit-shaped discharge outlet starts to work.

[0101] (3) After spraying, turn on the plasma power supply 8. The operating frequency is 15 kHz, the operating voltage is 2 kV, and the operating power is 200 W. The discharge electrode 6 starts to discharge, forming a stable blue-purple filamentary plasma. The discharge electrode 6 is controlled by the discharge driving motor 7 to move back and forth along the sliding rail 4. The full range of scanning of the paper sheet is carried out by using the plasma. The scanning time is 50s to complete the plasma treatment. After the plasma treatment is completed, the metal base plate moving motor 14 drives the metal base plate 1 to move out from the below the sliding rail 4. Then the sample is removed.

[0102] In this embodiment, the distance between the discharge electrode and the insulating layer is 2.5 mm.

[0103] In order to quantify the protective effect and to judge the effect of protective treatment on paper sheet, the pH value is measured according to standard procedures, the pH value and the total number of bacterial colonies of the paper sheet treated by hygrothermal aging are measured according to the standard procedure (according to the national standard GB/T 22894-2008). The results are shown in table 2.

TABLE-US-00002 TABLE 2 the total number of the total number of the pH value the pH value the pH value after bacterial colonies bacterial colonies before protective after protective hygrothermal before hygrothermal after hygrothermal treatment treatment aging aging (cfu/g) aging (cfu/g) Embodiment 1 5.6 7.8 7.6 2564 386 Comparative 5.6 7.5 7.2 2564 542 embodiment 1

Comparative Embodiment 2

[0104] Compared with the embodiment 1, the difference is that the device does not have a mist treating system. The selected samples are the same as the embodiment 1, and the other operation parameters are the same as the embodiment 1.

[0105] In order to quantify the protective effect and to judge the effect of protective treatment on paper sheet, the pH value is measured according to standard procedures, the pH value and the total number of bacterial colonies of the paper sheet treated by hygrothermal aging are measured according to the standard procedure (according to the national standard GB/T 22894-2008). The results are shown in table 3.

TABLE-US-00003 TABLE 3 the total number of the pH value the pH value the pH value after bacterial colonies before protective after protective hygrothermal before hygrothermal treatment treatment aging aging (cfu/g) Embodiment 1 5.6 7.8 2564 386 Comparative 5.6 6.9 2564 538 embodiment 2

Comparative Embodiment 3

[0106] Compared with the embodiment 1, the difference is that there is no vacuum suction holes on the top of the insulating layer in this device, and the paper sheet is not pretreated by the negative pressure generated by the vacuum suction holes before the discharge electrode starts to work. The selected samples are the same as the embodiment 1, and the other operation parameters are the same as the embodiment 1.

[0107] In order to quantify the protective effect and to judge the effect of protective treatment on paper sheet, the pH value is measured according to standard procedures, the pH value and the total number of bacterial colonies of the paper sheet treated by hygrothermal aging are measured according to the standard procedure (according to the national standard GB/T 22894-2008). The results are shown in table 4.

TABLE-US-00004 TABLE 4 the total number of the pH value the pH value the pH value after bacterial colonies before protective after protective hygrothermal before hygrothermal treatment treatment aging aging (cfu/g) Embodiment 1 5.6 7.8 2564 386 Comparative 5.6 7.4 2564 421 embodiment 3

[0108] In summary, the device for protecting paper sheet of the embodiment has the advantages of simple structure, convenient to use, and can quickly and effectively deacidify and sterilize the paper sheet.