CN109016824A - Furnace drying method and drying system suitable for intaglio printing - Google Patents
Furnace drying method and drying system suitable for intaglio printing Download PDFInfo
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- CN109016824A CN109016824A CN201810632530.6A CN201810632530A CN109016824A CN 109016824 A CN109016824 A CN 109016824A CN 201810632530 A CN201810632530 A CN 201810632530A CN 109016824 A CN109016824 A CN 109016824A
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- drying box
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
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- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
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Abstract
The invention discloses a kind of furnace drying methods and drying system suitable for intaglio printing.The furnace drying method is so that it is kept tiny structure and gas is sucked out in the outlet of drying box, avoids the leakage of waste gas containing VOC；Hot-air single is also flowed through drying box mode to be improved to circulate mode, the concentration of VOC in exhaust gas is increased, reduces exhausted air quantity, be conducive to being further processed for VOC in exhaust gas, and reduce the energy consumption of drying course.The invention also discloses a kind of drying systems suitable for intaglio printing, the drying system is mainly made of drying unit, monitoring control unit and exhaust gas deliverying unit, drying unit mainly forms gas circulation path by drying box, circulating fan, heat riser etc., monitoring control unit is changed into corresponding control signal by the signal for generating sensor after programmable logic controller (PLC) is handled, each parameter of drying system is regulated and controled, reaches and subsequent processing device is drained by exhaust gas deliverying unit after established standards.
Description
Technical field
The present invention relates to the drying process in printing industry, in particular to a kind of furnace drying method suitable for intaglio printing and
Drying system.
Background technique
Intaglio printing abbreviation gravure is one of four big mode of printings.General soft material all can serve as intaglio printing
Stock, plastics, paper, aluminium foil etc., especially for some materials for being easy to extensional, such as textile material, macromolecule membrane
Deng with well adapting to property.The printing product obtained using intaglio printing is with layer of ink is thick and solid, bright-colored, saturation degree is high, matter
The advantages that amount is stablized, printing number is big, print speed printing speed is fast, furthermore it is the thickness and ink that can arbitrarily control lines in plate-making
Deep or light level, be not easy to be imitated and forge, have the function of it is anti-fake, therefore packages printing, picture and text publish, marketable securities print
The fields such as system occupy and its consequence.
Ink used in intaglio printing is made of hard resin, volatile solvent, pigment, filling magazine additives.
Because it contains volatile solvent (VOC), so the printed matter needs for completing printing are adequately dried.In current intaglio process
During brush, printed matter to be dried is placed in drying box, then hot-air is pressed into drying box by blower, keeps volatility molten
Agent volatilization, is finally discharged drying box for the exhaust gas containing volatile solvent, discharges after processing.
The printed matter for completing printing needs to continuously enter drying box, so drying box is usually opening, with extraneous ring
Border communicates, therefore the part generated in drying box is expelled directly out containing the exhaust gas of volatile solvent, seriously pollutes environment；This
Outside, in order to reach better drying effect, often using the dosage for increasing hot-air, it will generate and largely volatilize containing low concentration
Property solvent exhaust gas, to exhaust gas it is subsequent improvement bring larger difficulty；Hot-air single pass drying box, the heat contained is not
It is fully used, being expelled directly out will result in heat and substantially lose；VOC concentration is too low in the exhaust gas of discharge, needs using coal, day
The burning of the fuel such as right gas carries out lighting processing.
In conclusion the drying course of intaglio printing at present, there are waste gas containing VOC leakage pollution environment, VOC is dense in exhaust gas
Spend it is lower be difficult to administer, the heat utilization ratio of hot-air is low and the problem of largely loss.Therefore, it is necessary to develop one kind to prevent VOC
Leakage increases VOC concentration in exhaust gas, reduces the drying side suitable for intaglio printing of drying course thermal loss and energy consumption
Method and drying system.
Summary of the invention
The object of the present invention is to provide a kind of furnace drying method and drying system suitable for intaglio printing, this method and
System can be avoided the leakage of waste gas containing VOC, improves the concentration of the VOC in exhaust gas and reduces exhaust gas total amount and is further controlled with reducing
The difficulty of reason, moreover it is possible to reduce the energy consumption of heating air and the energy consumption of waste gas pollution control and treatment.
The technical issues of leakage in order to solve above-mentioned waste gas containing VOC, the present invention provide a kind of suitable for intaglio printing
Furnace drying method, drying are carried out in the drying box 1-1 in micro-vacuum state.
The pressure limit of the tiny structure is 0~-30Pa.
Further, the pressure limit of the tiny structure is 0~-20Pa.
The pressure value refers to gauge pressure, refers to that absolute pressure is more than the numerical value of ambient atmospheric pressure, is that absolute pressure subtracts
Ambient atmosphere presses resulting numerical value, such as -30Pa to refer to its absolute pressure lower than ambient atmospheric pressure 30Pa.
Inventors have found that maintain the negative pressure state of drying box 1 it is possible to prevente effectively from waste gas containing VOC leakage, but it is excessive
Negative pressure the residual volatile content of organics of printed matter to be dried can be made exceeded, can only pass through reduce print speed printing speed, extend dry
The dry time, printed matter is made to reach relevant criterion.
To reach the state for making drying box 1 maintain tiny structure, inventor will in the prior art be blown hot-air by blower
The mode for entering drying box becomes sucking out the exhaust gas containing VOC in drying box, i.e., will provide mobilization dynamic for hot-air and set
The air intake vent of standby (such as blower) and the air outlet of drying box connect.The blower of operation inhales the exhaust gas in drying box containing VOC
Out, therefore in drying box gas pressure becomes smaller, and (drying box is open type by the opening of drying box for a small amount of air of ambient enviroment
) enter in drying box, to effectively prevent the exhaust gas leakage containing VOC.
Compared with prior art, the present invention needs to maintain micro- negative inside it in the state that drying box 1-1 is open type
Pressure condition is realized by changing the installation site for providing mobilization dynamic equipment (such as blower) in the prior art for hot-air
State purpose.It is further advanced by the setting of gas flow path pressure drop and adjusts the accurate control realized and realize tiny structure in drying box 1-1
System.
It is lower in order to solve VOC concentration in above-mentioned exhaust gas, the technical problem of larger difficulty is brought to subsequent processing, the present invention
A kind of furnace drying method suitable for intaglio printing is provided, hot-air is recycled during the drying process.
For the purpose that realization hot-air is recycled during the drying process, the gas that blower is sucked out inventor from drying box
Body is passed through in drying box again after heat riser heats.
To run with making drying course normal table, the concentration of VOC in the gas that will be recycled is needed to control certain
In range.The concentration of VOC cannot be too low in gas, and the amount of the exhaust gas containing VOC otherwise on the one hand generated is multiplied, another party
Face also increases the difficulty being further processed.For example, when VOC concentration is lower than 750ppm in exhaust gas, it just can not be using burning
Mode is handled.The concentration of VOC can not be excessively high in gas, and VOC is more than the danger that a certain concentration just has explosion, according to national phase
Pass standard, concentration is no more than 5500ppm.Therefore, the concentration of the VOC in exhaust gas should be controlled in 750ppm to 5500ppm
In range.
The concentration unit of VOC in the exhaust gas is ppm, is a kind of volumetric concentration representation, is meant that 1,000,000
Volume number containing the gas stated in the gas of volume.For example, the VOC concentration in exhaust gas is that 1000ppm is meant that one
Amount in the gas of million unit volumes containing VOC is 1000 unit volumes.
Further, the concentration of the VOC controls a certain concentration within the scope of 1000ppm to 5000ppm；
Further, the concentration of the VOC controls within the scope of 1000ppm to 1100ppm.
The VOC concentration in drying unit is controlled in a certain range by the discharge of exhaust gas and the entrance of fresh air.
VOC concentration mensuration site is set in fan outlet, when its concentration value meets or exceeds setting value, opens related valve or sets
It is standby, so that exhaust gas of the part containing VOC is left drying unit, fresh air enters drying box by the open ports of drying box.Work as drying
When the volatile quantity of VOC is identical as the VOC's that contains in the exhaust gas for leaving drying unit in case, it is in the state of stable operation；
When the volatile quantity of VOC in drying box, which is greater than, leaves the VOC contained in the exhaust gas of drying unit, VOC in gas in drying unit
Concentration increases, then should increase the discharge rate of the exhaust gas containing VOC；Drying unit is left when the volatile quantity of VOC in drying box is less than
When the VOC contained in exhaust gas, VOC concentration is reduced in gas in drying unit, then should reduce the discharge rate of the exhaust gas containing VOC or stop
Only it is discharged.
When upper limit value of the VOC concentration of gas in drying unit close to its setting, exhaust gas should be opened and force discharge mode,
The exhaust gas of the VOC containing high concentration is discharged rapidly and is reduced its concentration, prevents dangerous generation.
The exhaust gas of discharge is further processed the VOC wherein contained by way of directly burning.
To guarantee stable operation, the measurement frequency of gas VOC concentration should be in 3 times/hour or more.
In order to solve the above-mentioned technical problem, the present invention also provides a kind of drying system suitable for intaglio printing, the drying
System includes drying unit, monitoring control unit and exhaust gas deliverying unit.
The drying unit includes drying box 1-1, regulating valve 1-2, circulating fan 1-3 and heat riser 1-4.
The air inlet of the circulating fan 1-3 is connect with the air outlet of drying box 1-1, the air outlet of circulating fan 1-3
It is connect with the air inlet of heat riser 1-4, the air outlet of heat riser 1-4 is connect with the air inlet of drying box 1-1, forms gas
The path of recyclable flowing.
The drying box 1-1 is open type.The open type refers to the air outlet and air inlet in addition to drying box 1-1
Outside, there are also other gas inlet and outlets, such as can be the inlet and outlet of printed matter to be dried, are also possible to the fresh sky being specially arranged
The import of gas.It is possible to further the import for the fresh air being specially arranged setting manually or automatically adjust fresh air into
Entering amount can device.
The regulating valve 1-2 is arranged between drying box 1-1 and circulating fan 1-3, refers to by receiving to adjust control
The control signal of unit output goes to change the final of the technological parameters such as rate-of flow, pressure, temperature, liquid level by power operation
Control element, also referred to as control valve.Generally it is made of executing agency and valve.Regulating valve of the present invention can be pneumatically
Regulating valve is also possible to electric control valve or hydraulic adjusting valve.
The circulating fan 1-3 refers to the mechanical energy by input, improves gas pressure and supplies gas side by side the machinery of body.This
The invention circulating fan includes but is not limited to the types such as centrifugal fan, axial fan, diagonal flow fan.The present invention into
The preferred centrifugal fan of one step.
The heat riser 1-4 refers to the temperature for improving by energy exchange or energy conversion and flowing through its internal gas
The device of degree.Such as can be heat exchanger (such as plate heat exchanger, shell and tube exchanger), (such as using the medium containing heat
Hot water, hot gas etc.) heat the gas for flowing through its inside.It is also possible to that other form of energy can be converted to the heating of thermal energy
Device, such as electric heater convert electrical energy into energy heats and flow through its internal gas.
Heat riser 1-4 of the present invention can be the heat exchanger that a set passes through energy exchange mode, be also possible to
One set passes through the heater of energy translative mode, can also be the heat riser or different types of heating dress of same type
The combination set, such as can choose air-water heat exchanger and electric heater combines, the heat riser as gas.
The monitoring control unit includes sample cock 2-1, VOC concentration detector 2-2, pressure sensor 2-3, can compile
Journey logic controller (PLC) 2-4 and alarm 2-5.
The sample cock 2-1 is connect by sampling line with VOC concentration detector 2-2, programmable logic controller (PLC)
2-4 is connect by signal transmssion line with sample cock 2-1, and VOC concentration detector 2-2 passes through signal transmssion line and programmable logic
Controller 2-4 connection, pressure sensor 2-3 are connect by signal transmssion line with programmable logic controller (PLC) 2-4, alarm 2-5
It is connect by signal transmssion line with programmable logic controller (PLC) 2-4.
The sample cock 2-1 is arranged between the sample tap of circulating fan 1-3 and VOC concentration detector 2-2, is one
Kind is able to respond the automatic switch valve of control signal.Such as can be normally closed solenoid valve, when needing to be measured by sampling VOC concentration,
It is able to respond the electric signal of control system sending, open state is become from closed state, under test gas sample is made to enter detector.
The VOC concentration detector 2-2 includes device for drying and filtering, dust removal filter, air pump, instrument flowmeter, emptying
Flowmeter and VOC sensor.
The pressure sensor 2-3 is arranged on drying box 1-1, and pressure signal can be experienced by referring to, and can be according to certain
Rule pressure signal is converted into available output electric signal device or device.Further, pressure of the present invention
Force snesor refers to differential pressure pick-up, can be between the gas pressure in Accurate Determining testing container and the gas pressure of environment
Difference.
The alarm 2-5 is combined aural and visual alarm, and effect is when VOC concentration is more than the upper of setting in the gas of detection
After limit value, sound-light alarm is issued, operator is reminded to carry out corresponding emergency measure.
The exhaust gas deliverying unit include exhaust gas discharge main line 3-1, exhaust gas discharge branch 3-2, frequency conversion fan 3-3,
Regulating valve 3-4 and switch valve 3-5.
The exhaust gas discharge branch 3-2 is successively to set from the path of drying unit discharge exhaust gas along gas flow direction
It is equipped with regulating valve 3-4 and switch valve 3-5, is then connect with exhaust gas discharge main line 3-1, frequency conversion fan 3-3 is connected to exhaust gas row
Out on main line 3-1.
The switch valve 3-5 has been the switch of cut-off effect, can be manually, can also be grasped by other power
Make, for example, by using operated pneumatic valve, electrically operated valve or the valve that surges etc..
The frequency conversion fan 3-3 is the blower for being mounted with frequency converter, can reach adjusting by adjusting the revolving speed of motor
Exhaust air rate and pressure.
Branch is discharged by exhaust gas in the drying unit and exhaust gas deliverying unit of the drying system suitable for intaglio printing
Road (3-2) connection, tie point is in the air outlet of the circulating fan (1-3) of drying unit and the air inlet of heat riser (1-4)
Between.
The drying unit of the drying system suitable for intaglio printing is connected with monitoring control unit.With sampling valve
Circulating fan (1-3) air outlet of drying unit is arranged in the sample tap of door 2-1 connection and branch (3-2) tie point is discharged in exhaust gas
Between.The pressure sensor 2-3 of monitoring control unit is mounted on the drying box 1-1 of drying unit, then passes through signal line
It is connected with programmable logic controller (PLC) (PLC) 2-4 of monitoring control unit.Monitor the programmable logic controller (PLC) of control unit
(PLC) 2-4 is also connected with the regulating valve 1-2 of drying unit by signal line.
The monitoring control unit suitable for intaglio printing is connected with exhaust gas deliverying unit.Monitor control unit
Programmable logic controller (PLC) (PLC) 2-4 and the regulating valve 3-4 and frequency conversion fan 3-3 of exhaust gas deliverying unit pass through signal line phase
Connection.
Furnace drying method and drying system provided by the invention suitable for intaglio printing, overcomes prior art intaglio printing
Volatile organic matter VOC leakage pollution environment in drying process, VOC concentration is low in exhaust gas is difficult to handle, and energy consumption is big to be lacked
It falls into, preferable technical solution can be provided for the energy-saving and emission-reduction of printing industry.
Detailed description of the invention
Fig. 1 is the drying course schematic diagram of intaglio printing in the prior art；
Fig. 2 is the furnace drying method schematic diagram suitable for intaglio printing of the invention；
Fig. 3 is the drying system schematic diagram suitable for intaglio printing of the invention；
Wherein:
1, drying box in the prior art, 2, blower in the prior art, 3, heater in the prior art；
1-1, drying box, 1-2, regulating valve, 1-3, circulating fan, 1-4, heat riser；
2-1, sample cock, 2-2, VOC concentration detector, 2-3, pressure sensor, 2-4, programmable logic controller (PLC), 2-
5, alarm；
Main line is discharged in 3-1, exhaust gas, and branch, 3-3, frequency conversion fan, 3-4, regulating valve, 3-5, switch is discharged in 3-2, exhaust gas
Valve.
Specific embodiment
Furnace drying method provided by the invention suitable for intaglio printing, by by the air inlet of the air outlet of drying box and blower
Exhaust gas containing VOC, i.e., be sucked out from drying box using blower, so that drying box is in micro-vacuum state, to prevent by mouth connection
Exhaust gas containing VOC is leaked from the open-mouth of open type drying box.In order to improve the concentration of VOC in exhaust gas, in favor of further controlling
Drying box is discharged the lower exhaust gas of VOC concentration after heat riser is heated to the temperature needed, is passed through drying box again by reason
In, this furnace drying method can also reduce gas heating energy consumption.The VOC concentration for the gas being recycled in unit to be dried reaches one
Determine concentration, exhaust gas of the branch discharge part containing VOC is discharged from the exhaust gas that circulating fan air outlet is arranged in, fresh air then passes through
The open-mouth of drying box enters drying unit.
Using the initial stage of furnace drying method drying printed matter, the VOC concentration of gas is lower in drying unit, Ke Yi
Be able to maintain under the premise of drying box is in micro-vacuum state, do not arrange or few waste air so that in drying unit gas VOC
Concentration increases, and reaches the limit value of requirement.When the VOC concentration of gas in drying unit is higher than the concentration of setting, exhaust gas can be increased
Discharge rate, correspondingly the inlet of fresh air also increases；When the VOC concentration of gas in drying unit is lower than the concentration set
When, the discharge rate of exhaust gas can be reduced, correspondingly the inlet of fresh air is also reduced, when volatility in drying box in the unit time
When the volatile quantity of organic matter VOC and the inlet of fresh air match, the drying course of printed matter is in metastable shape
State.When drying completion, the discharge rate of exhaust gas is adjusted to maximum, the exhaust gas in drying unit containing VOC can be completely exhausted out, with
Guarantee safety.
In order to improve drying rate, the fresh air after heating further can be supplemented into drying box.
For the energy consumption for further decreasing gas heating, can be carried out by the exhaust gas of discharge and into the fresh air of drying box
Heat exchange, being transferred to heat remaining in exhaust gas will enter in the fresh air of drying unit.
Drying system provided by the invention suitable for intaglio printing, mainly by drying unit, detection control unit and useless
Gas deliverying unit composition.Its building block and connection relationship are as shown in Figure 3.
The drying system suitable for intaglio printing, the component part with the micro-vacuum state for adjusting drying box 1-1
Mainly there are regulating valve 1-2, regulating valve 3-4, circulating fan 1-3 and frequency conversion fan 3-3.The aperture for reducing regulating valve 1-2 can increase
Air pressure in drying box 1-1, i.e. negative pressure reduce；On the contrary then reduce the air pressure in drying box 1-1, i.e., negative pressure increases.Increase and adjusts
The aperture of valve 3-4 can reduce the air pressure in drying box 1-1；It is on the contrary then increase the air pressure in drying box 1-1.Increase circulating fan 1-
The exhaust air rate of 3 or frequency conversion fan 3-3 can reduce the air pressure in drying box 1-1, on the contrary then can increase the gas in drying box 1-1
Pressure.When needing to adjust air pressure in drying box 1-1, one of above-mentioned component part can be individually adjusted, can also be combined in adjusting
It states several in component part.
Using the initial stage of drying system drying printed matter, the VOC concentration of gas is lower in drying unit, Ke Yi
It is able to maintain under the premise of drying box 1-1 is in micro-vacuum state, does not arrange or few waste air, so that gas in drying unit
VOC concentration increases, and reaches at or above the limit value of requirement.When the VOC concentration of gas in drying unit reaches setting concentration or more,
Programmable logic controller (PLC) 2-4 receives the excessive signal of the next VOC concentration of VOC concentration detector 2-2 transmission, through logical operation
Corresponding control signal is generated, corresponding regulating valve 3-4 is output to, increases its aperture, improves exhaust gas in drying unit
Discharge rate, correspondingly fresh air inlet increases, and reduces the VOC concentration of exhaust gas in drying unit, when being reduced to setting
When limit value, programmable logic controller (PLC) 2-4 receives the too small signal of the next VOC concentration of VOC concentration detector 2-2 transmission, warp
Logical operation generates corresponding control signal, is output to corresponding regulating valve 3-4, reduces its aperture, reduces drying unit
The discharge rate of middle exhaust gas, correspondingly fresh air inlet is reduced, and increases the VOC concentration of exhaust gas in drying unit, so as to
The VOC concentration that exhaust gas is discharged is controlled in the range of setting.
In some special cases, the VOC concentration of gas is excessive in a certain drying unit, near or above upper safety limit
When, programmable logic controller (PLC) 2-4 receives the letter that the VOC concentration that VOC concentration detector 2-2 transmission comes is more than upper safety limit
Number, corresponding control signal is generated through logical operation, corresponding regulating valve 3-4 is output to, opens its aperture to maximum, it is maximum
The discharge rate of exhaust gas and fresh air inlet in drying unit are improved to limit, keeps the VOC concentration of exhaust gas in drying unit fast
The control signal that programmed logic controller 2-4 is generated is output to alarm 2-5 as low as in safe range by prompt drop, makes to report
Alert device 2-5 issues sound-light alarm, prompts relevant operation personnel to take measures, prevents dangerous situation.
To precisely control the pressure in drying box, the circulating fan can also use frequency conversion fan, the frequency conversion
Blower can also be connect with programmable logic controller (PLC) 2-4, adjust turning for circulating fan according to the pressure signal in drying box 1-1
Speed regulates and controls the pressure in drying box.
The drying system suitable for intaglio printing, can be single by a monitoring control unit and an exhaust gas discharge
Member and several drying units composition.Each drying unit can be according to the drying characteristic of printed matter to be dried individually
Set VOC concentration limit etc. in its operating parameter, such as tiny structure value, air circulation, gas.
Effect of the invention
Of the invention is suitable for the furnace drying method of intaglio printing and the benefit of drying system: 1. avoiding the exhaust gas containing VOC
A large amount of leakages, pollute environment；2. increasing the concentration of VOC in the exhaust gas of drying course discharge, burning processing, nothing can be directly carried out
The fuel auxiliary combustions such as coal, natural gas need to be in addition used, exhaust gas total amount is reduced, are provided just for the subsequent improvement of waste gas containing VOC
Benefit；3. reducing the energy consumption of drying course by recycling for hot-air.
Comparative example 1
Using attached traditional printing furnace drying method shown in FIG. 1, after fresh air is heated to 55 DEG C by heater 3, through wind
Machine 2 is passed through the air inlet of open type drying box 1, the volatile organic matter VOC volatilization in printed matter ink, in the exhaust gas of generation
The concentration of VOC is about 100ppm, and the temperature of exhaust gas is about 40 DEG C, wherein opening of about 60% exhaust gas from open type drying box 1
It leaks into ambient enviroment, about 40% exhaust gas is discharged to waste gas burning room from the gas outlet of drying box 1, using natural gas by exhaust gas
In volatile organic matter VOC burn.
Comparative example 2
Using attached traditional printing furnace drying method shown in FIG. 1, after fresh air is heated to 60 DEG C by heater 3, through wind
Machine 2 is passed through the air inlet of open type drying box 1, the volatile organic matter VOC volatilization in printed matter ink, in the exhaust gas of generation
The concentration of VOC is about 120ppm, and the temperature of exhaust gas is about 49 DEG C, wherein opening of about 70% exhaust gas from open type drying box 1
It leaks into ambient enviroment, about 30% exhaust gas is discharged to waste gas burning room from the gas outlet of drying box 1, using natural gas by exhaust gas
In volatile organic matter VOC burn.
Embodiment 1
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 60 DEG C, and air outlet temperature is about 46 DEG C, and the tiny structure in drying box 1-1 is maintained at -10Pa, and air circulation is about
5500m3/ h, the concentration of VOC is about 3600ppm in the gas of the air outlet of drying box 1-1, is contained from what exhaust gas discharge branch was discharged
The speed of VOC exhaust gas is about 450m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From baking
The exhausted air quantity of dry case 1-1 opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to 30 times of conventional method or more, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only to pass
The 3%~4% of system method reduces by 90% or more the energy consumption of gas heating.
Embodiment 2
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 55 DEG C, and air outlet temperature is about 41 DEG C, and the tiny structure in drying box 1-1 is maintained at -30Pa, and air circulation is about
6000m3/ h, the concentration of VOC is about 750ppm in the gas of the air outlet of drying box 1-1, is contained from what exhaust gas discharge branch was discharged
The speed of VOC exhaust gas is about 1900m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From baking
The exhausted air quantity of dry case 1-1 opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to about 7.5 times of conventional method, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only to pass
The 16%~17% of system method reduces by 80% or more the energy consumption of gas heating.
Embodiment 3
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 58 DEG C, and air outlet temperature is about 44 DEG C, and the tiny structure in drying box 1-1 is maintained at -0.01Pa, and air circulation is about
5900m3/ h, the concentration of VOC is about 5500ppm in the gas of the air outlet of drying box 1-1, is contained from what exhaust gas discharge branch was discharged
The speed of VOC exhaust gas is about 390m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From baking
The exhausted air quantity of dry case 1-1 opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to about 50 times of conventional method, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only tradition
The 2% of method reduces by 95% or more the energy consumption of gas heating.
Embodiment 4
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 60 DEG C, and air outlet temperature is about 48 DEG C, and the tiny structure in drying box 1-1 is maintained at -20Pa, and air circulation is about
5600m3/ h, the concentration of VOC is about 2000ppm in the gas of the air outlet of drying box 1-1, is contained from what exhaust gas discharge branch was discharged
The speed of VOC exhaust gas is about 900m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From baking
The exhausted air quantity of dry case 1-1 opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to about 20 times of conventional method, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only tradition
The 5% of method reduces by 95% or more the energy consumption of gas heating.
Embodiment 5
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 60 DEG C, and air outlet temperature is about 49 DEG C, and the tiny structure in drying box 1-1 is maintained at -26Pa, and air circulation is about
6000m3/ h, the concentration of VOC is about 1000ppm in the gas of the air outlet of drying box 1-1, is contained from what exhaust gas discharge branch was discharged
The speed of VOC exhaust gas is about 1800m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From baking
The exhausted air quantity of dry case 1-1 opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to about 10 times of conventional method, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only tradition
The 10% of method reduces by 90% or more the energy consumption of gas heating.
Embodiment 6
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 51 DEG C, and air outlet temperature is about 40 DEG C, and the tiny structure in drying box 1-1 is maintained at -5Pa, and air circulation is about 5500m3/
H, the concentration of VOC is about 5000ppm in the gas of the air outlet of drying box 1-1, the waste gas containing VOC being discharged from exhaust gas discharge branch
Speed be about 360m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From drying box 1-1
The exhausted air quantity of opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to about 45 times of conventional method, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only tradition
The 96% of method reduces by 93% or more the energy consumption of gas heating.
Embodiment 7
Using the furnace drying method suitable for intaglio printing of the invention shown in attached drawing 2, the gas temperature of drying box 1-1 air inlet
Degree is 60 DEG C, and air outlet temperature is about 46 DEG C, and the tiny structure in drying box 1-1 is maintained at -24Pa, and air circulation is about
5900m3/ h, the concentration of VOC is about 1100ppm in the gas of the air outlet of drying box 1-1, is contained from what exhaust gas discharge branch was discharged
The speed of VOC exhaust gas is about 1500m3/ h, by this portion be discharged to waste gas burning room can directly light and burn sufficiently.From baking
The exhausted air quantity of dry case 1-1 opening leaks is 0.
Compared with using traditional printing furnace drying method, it is entirely avoided the leakage of waste gas containing VOC；VOC's is dense in exhaust gas
Degree is increased to about 10 times of conventional method, can directly light without auxiliary fuel, save fuel；Discharge amount of exhaust gas is only tradition
The 90% of method reduces by 88% or more the energy consumption of gas heating.
Embodiment 8
It is right under the conditions described in example 1 using the drying system suitable for intaglio printing of the invention shown in attached drawing 3
Printed matter is dried.
The negative pressure value for needing to keep in drying box 1-1 is set on programmable logic controller (PLC) 2-4 as -10Pa, setting
The regulation and control object for keeping drying box 1-1 negative pressure value is regulating valve 1-2.When the air pressure in drying box 1-1 is higher, pressure sensor
The pressure signal is transmitted to programmable logic controller (PLC) 2-4 by 2-3, through programmable logic controller (PLC) 2-4 logical operation, to adjusting
Valve 1-2 issues the signal for increasing aperture, and the aperture of regulating valve 1-2 increases, and the air circulation of drying box 1-1 increases, negative pressure value
It is reduced to -10Pa；When the air pressure in drying box 1-1 is relatively low, which is transmitted to programmable patrol by pressure sensor 2-3
Controller 2-4 is collected, through programmable logic controller (PLC) 2-4 logical operation, the signal for reducing aperture is issued to regulating valve 1-2, is adjusted
The aperture of valve 1-2 reduces, and the air circulation of drying box 1-1 reduces, and negative pressure value is increased to -10Pa.Negative pressure in drying box 1-1
Value is controlled between -8Pa to -12Pa.
Set on programmable logic controller (PLC) 2-4 exhaust gas VOC discharge concentration as 3600ppm, programmable logic controller (PLC)
The signal for allowing sample cock 2-1 to open is issued within 2-4 every 10 minutes, while the air pump operation in VOC concentration detector 2-2, from following
It extracts gaseous sample and carries out VOC Concentration Testing in the outlet of ring blower 1-3.When VOC concentration is lower than 3600ppm in gas, can compile
Journey logic controller 2-4 issues the signal for reducing aperture or being closed completely to regulating valve 3-4, and the aperture of regulating valve 3-4 reduces,
Offgas discharge amount reduces；When VOC concentration is at or above 3600ppm in gas, programmable logic controller (PLC) 2-4 is to adjusting
Valve 3-4 issues the signal for increasing aperture, and the aperture of regulating valve 3-4 increases, and the discharge rate of exhaust gas increases.VOC in the exhaust gas of discharge
Concentration be controlled to 3500ppm between 3700ppm.
The warning concentration of exhaust gas VOC is set on programmable logic controller (PLC) 2-4 as 5500ppm, when VOC concentration detector
When 2-2 detects the concentration value at or above 5500ppm, programmable logic controller (PLC) 2-4 is sounded an alarm to alarm 2-5
Enabling signal, alarm 2-5 issue sound-light alarm, remind relevant operation personnel to carry out relevant operation manually, make in drying system
The VOC concentration of gas is rapidly decreased near setting value 3600ppm, it is ensured that safety.
Embodiment 9
It is right under the conditions of as described in example 2 using the drying system suitable for intaglio printing of the invention shown in attached drawing 3
Printed matter is dried.
The negative pressure value for needing to keep in drying box 1-1 is set on programmable logic controller (PLC) 2-4 as -28Pa, setting
The regulation and control object for keeping drying box 1-1 negative pressure value is regulating valve 1-2, frequency conversion fan 3-3, regulating valve 3-4.When in drying box 1-1
Air pressure it is higher when, which is transmitted to programmable logic controller (PLC) 2-4 by pressure sensor 2-3, through programmable logic
Controller 2-4 logical operation issues the signal for increasing aperture to regulating valve 1-2, and the aperture of regulating valve 1-2 increases, drying box 1-1
Air circulation increase, to frequency conversion fan 3-3 issue up-conversion signal, frequency conversion fan 3-3 revolving speed increase, offgas discharge amount increase,
The signal for increasing aperture is issued to regulating valve 3-4, offgas discharge amount also increases accordingly, and negative pressure value is reduced to -29Pa；Work as drying
When air pressure in case 1-1 is relatively low, which is transmitted to programmable logic controller (PLC) 2-4 by pressure sensor 2-3, can be compiled
Journey logic controller 2-4 logical operation, the signal for reducing aperture is issued to regulating valve 1-2, and the aperture of regulating valve 1-2 reduces, dries
The air circulation of dry case 1-1 reduces, and issues down-scaled signals to frequency conversion fan 3-3, and frequency conversion fan 3-3 revolving speed reduces, exhaust gas discharge
Amount reduces, and the signal for reducing aperture is issued to regulating valve 3-4, and offgas discharge amount also accordingly reduces, and negative pressure value is increased to-
26Pa.Negative pressure value in drying box 1-1 is controlled between -26Pa to -30Pa.
Set on programmable logic controller (PLC) 2-4 exhaust gas VOC discharge concentration as 760ppm, programmable logic controller (PLC) 2-
4 issue the signal for allowing sample cock 2-1 to open in every 20 minutes, while the air pump operation in VOC concentration detector 2-2, from circulation
It extracts gaseous sample and carries out VOC Concentration Testing in the outlet of blower 1-3.It is programmable to patrol when VOC concentration is lower than 750ppm in gas
It collects controller 2-4 and issues the signal for reducing aperture or being closed completely to regulating valve 3-4, the aperture of regulating valve 3-4 reduces, exhaust gas
Discharge rate reduces；When VOC concentration is at or above 750ppm in gas, programmable logic controller (PLC) 2-4 is to regulating valve 3-4
The signal for increasing aperture is issued, the aperture of regulating valve 3-4 increases, and the discharge rate of exhaust gas increases.The concentration of VOC in the exhaust gas of discharge
750ppm is controlled to between 770ppm.
The warning concentration of exhaust gas VOC is set on programmable logic controller (PLC) 2-4 as 5000ppm, when VOC concentration detector
When 2-2 detects the concentration value at or above 5000ppm, programmable logic controller (PLC) 2-4 is sounded an alarm to alarm 2-5
Enabling signal, alarm 2-5 issue sound-light alarm, remind relevant operation personnel to carry out relevant operation manually, make in drying system
The VOC concentration of gas is rapidly decreased near setting value 760ppm, it is ensured that safety.
Embodiment 10
Based on the drying system suitable for intaglio printing of the invention shown in attached drawing 3, by the quantity of drying unit
8 are increased to, programmable logic controller (PLC) 2-4 connects the building block for needing to control in all drying units, and each drying is single
Pressure sensor 2-3 and sample cock 2-1 is respectively configured in the drying box 1-1 of member.Monitor control unit and exhaust gas deliverying unit still
It is so only a set of.
Each drying unit in the drying system can be set separately according to the drying characteristic of printed matter to be dried.
Claims (10)
1. a kind of furnace drying method suitable for intaglio printing, which is characterized in that drying is in the drying box for being in micro-vacuum state
It is carried out in (1-1), the pressure limit of the tiny structure is 0~-30Pa.
2. the furnace drying method according to claim 1 suitable for intaglio printing, which is characterized in that the pressure of the tiny structure
Power range is 0~-20Pa.
3. the furnace drying method according to claim 1 suitable for intaglio printing, which is characterized in that dry the hot-air used
It is for the medium that VOC is carried out in ink used, and hot-air recycling will to be printed.
4. the furnace drying method according to claim 3 suitable for intaglio printing, which is characterized in that by the discharge of exhaust gas and
In a certain range by the VOC concentration control in drying box (1-1), the concentration of the VOC controls for the entrance of fresh hot air
A certain concentration within the scope of 750ppm to 5500ppm.
5. the furnace drying method according to claim 4 suitable for intaglio printing, it is characterised in that: the exhaust gas of discharge passes through straight
The mode for connecing burning is further processed.
6. a kind of drying system suitable for intaglio printing, which is characterized in that including drying unit, monitoring control unit and exhaust gas
Deliverying unit；
The drying unit includes drying box (1-1), regulating valve (1-2), circulating fan (1-3) and heat riser (1-4)；
The monitoring control unit include sample cock (2-1), VOC concentration detector (2-2), pressure sensor (2-3), can
Programmed logic controller (2-4) and alarm (2-5)；
The exhaust gas deliverying unit includes exhaust gas discharge main line (3-1), exhaust gas discharge branch (3-2), frequency conversion fan (3-
3), regulating valve (3-4) and switch valve (3-5)；
The drying unit is connect with exhaust gas deliverying unit, and monitoring control unit and drying unit and exhaust gas deliverying unit connect
It connects.
7. the drying system according to claim 6 suitable for intaglio printing, which is characterized in that the circulating fan
The air inlet of (1-3) is connect with the air outlet of drying box (1-1), air outlet and heat riser (1-4) of circulating fan (1-3)
Air inlet connection, the air outlet of heat riser (1-4) are connect with the air inlet of drying box (1-1), the recyclable flowing of composition gas
Path.
8. the drying system according to claim 7 suitable for intaglio printing, which is characterized in that in the circulation of drying unit
Branch (3-2) is discharged with the exhaust gas of exhaust gas deliverying unit between the air outlet of blower (1-3) and the air inlet of heat riser (1-4)
Connection, exhaust gas is discharged on branch (3-2) and is disposed with regulating valve (3-4) and switch valve (3-5) along gas flow direction, described
Outlet end and the exhaust gas of exhaust gas discharge branch (3-2) main line (3-1) be discharged connect, frequency conversion fan (3-3) is connected to exhaust gas
The outlet end of main line (3-1) is discharged.
9. the drying system according to claim 7 suitable for intaglio printing, which is characterized in that at circulating fan (1-3)
Air outlet be arranged sampling hole, by sampling line with monitor control unit VOC concentration detector (2-2) connect, VOC concentration
Detector (2-2) is attached with programmable logic controller (PLC) (2-4) by route, and programmable logic controller (PLC) (2-4) passes through
Route is connect with regulating valve (3-4) and frequency conversion fan (3-3).
10. the drying system according to claim 7 suitable for intaglio printing, which is characterized in that pressure sensor (2-3)
It is mounted on drying box (1-1), pressure sensor (2-3) is connect by route with programmable logic controller (PLC) (2-4), may be programmed
Logic controller (2-4) is connect by route with regulating valve (1-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632530.6A CN109016824A (en) | 2018-06-20 | 2018-06-20 | Furnace drying method and drying system suitable for intaglio printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632530.6A CN109016824A (en) | 2018-06-20 | 2018-06-20 | Furnace drying method and drying system suitable for intaglio printing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109016824A true CN109016824A (en) | 2018-12-18 |
Family
ID=64609731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810632530.6A Withdrawn CN109016824A (en) | 2018-06-20 | 2018-06-20 | Furnace drying method and drying system suitable for intaglio printing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109016824A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154521A (en) * | 2019-05-29 | 2019-08-23 | 宁波欣达印刷机器有限公司 | A kind of system dried printed matter and tail gas is concentrated |
| CN110561904A (en) * | 2019-09-11 | 2019-12-13 | 浙江美格机械股份有限公司 | Hot air negative pressure circulation drying system |
| CN112706518A (en) * | 2020-12-25 | 2021-04-27 | 杨凌昱昌环境科技有限公司 | Printing color set air-reducing and thickening interlocking control device of printing machine |
-
2018
- 2018-06-20 CN CN201810632530.6A patent/CN109016824A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154521A (en) * | 2019-05-29 | 2019-08-23 | 宁波欣达印刷机器有限公司 | A kind of system dried printed matter and tail gas is concentrated |
| CN110561904A (en) * | 2019-09-11 | 2019-12-13 | 浙江美格机械股份有限公司 | Hot air negative pressure circulation drying system |
| CN112706518A (en) * | 2020-12-25 | 2021-04-27 | 杨凌昱昌环境科技有限公司 | Printing color set air-reducing and thickening interlocking control device of printing machine |
| CN112706518B (en) * | 2020-12-25 | 2024-05-17 | 杨凌昱昌环境科技有限公司 | Linkage control device for wind-reducing and thickening of printing color group of printing machine |
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Application publication date: 20181218 |