SU1320625A1 - Method of controlling drying process - Google Patents

Description

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The invention relates to methods of ripping, grinding a process, continuous drying, mainly emulsion layers in the production of cinema photographs on flexible substrates, and can be used in various branches of industry when drying thin sheet materials.

There is a known method for controlling the drying process in a multi-zone dryer by adjusting the temperature and moisture content of air in each zone measuring the surface temperature and humidity of the dried emulsion layer of the material and using them to adjust the temperature and moisture content of air.

However, this method does not allow to provide the required physicomechanical properties of the products produced,

The purpose of the invention is to improve the quality of the product, mainly in the production of film photographic materials on large-sized sub-markets, by improving their physical and mechanical properties.

The goal is achieved in that according to the method of controlling the drying process, which takes place in two periods in a multi-zone suip-shku, by adjusting the air temperature B in each zone with correction according to the deviation of the surface temperature of the dried emulsion layer of the material measured at the exit of the non-termination zones constant and falling drying speeds, from a given value and limitation, according to its maximum air temperature values, correspond in previous zones of the specified periods; lag air content at the entrance to the zones of constant and falling speeds by land, as well as to stabilization zones with correction, according to the deviation of moisture content of the drying emulsion layer of the material measured on., leaving the zones of the end of the period of the drying speed and stabilization, from the specified value, In addition, the moisture content of the dried emulsion layer of the material is measured at the outlet of the zones of the period of a constant drying rate and, if it deviates from a predetermined value, the moisture content of the inlet air is corrected.

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40A drawing shows a diagram of a device that implements the proposed method for regulating the drying process.

The device contains a multi-zone dryer with zones 1, 2 and 3 blocks of the first period of a constant drying speed, zones 4-7 of the second period of the falling drying speed and zone 8 of the third block of the period of stabilization of the emulsion film film on a flexible substrate, heaters 9-13 and air conditioners 14, 15 and 16 systems for the preparation and delivery of the drying agent to the dryer zones, air temperature sensors 17-24 in the corresponding dryer zones, temperature sensors 25 and 26 temper- aT of the surface of the dried emulsion layer of the material, respectively, at the exit from zones 3 and 7, d ticks 27, 28 and 29 of the emulsified layer of material to be dispensed at the exit from zones 3 and 7 and at the exit from the dryer after stabilization zone 8, sensors 30. 31 and 32 moisture content of air at the entrance to blocks I, II and III dryers, secondary devices 33-40 with air temperature regulators in the corresponding 1x zones of the dryer, secondary devices 41 and 42 with regulating the surface temperature of the emulsion layer at the indicated points, secondary devices 43, 44 and 45 with moisture regulators of the emulsion layer at the output of the blocks I, II dryers, secondary devices 46, 47 and 48 with re the humulators of the moisture content of the air at the entrance to the blocks T, II and III dryers, blocks 49 and 50

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limitations on max fy ry of signals for correction of tasks to temperature regulators of air; and blocks 51–57 for the final generation of signals for correction of tasks to correspond to air temperature regulators.

The method of controlling the drying process is carried out as follows.

During the drying process, the sensors 17, 23 and 24 convert the air temperature at the inlets to zones 1, 7 and 8 of the dryer into electrical signals, which are recorded by secondary devices - 55, 33, 39 and 40 and converted into pneumatic signals. signals, controllers of these devices generate command signals to

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the corresponding control valves of air conditioners 14, 15 and 16. The air temperature at the inlets to zones 2-6 of the sensor drier 1-8-22 is converted into electrical signals recorded by secondary devices 34 -38 and converted into pneumatic signals. In the regulators of these devices are formed command signals that are applied to the corresponding control valves of the heaters 9-13. The surface temperature of the dried emulsion layer at the outputs of units I and II of the dryer zone is converted by sensors 25 and 26, the signals of which reg-15 I and II dryers sensors 25 and 26 are modified by secondary devices 41 and 42. In the controllers of these devices, command correction signals are generated assignments to air temperature regulators in the areas of the dryer, which, after passing through the blocks 49 and 50 of signal limiting and, respectively, through the blocks 51 - 53 and 54 - 57 of the final generation of the correction signals.

give the signals to the secondary devices 41 l 42 and to the measuring parts of their pelto tori, where they compare;: l-: with the given values, the error signals are sent to the decisive control units, processed in them, for example, proportional , the law of regulation and in the form of command signals are given as tasks for the regulators through blocks 45 and 50 of limiting the drivers of secondary devices 33 - 35 and by maximum and blocks 51 -53 and 54 -57

the final shaping of the signals go to the secondary controllers

36 - 39 air temperature in the areas of the dryer.

Moisture content of air inlets

devices 33-35 and 36- 39 temperatures

ki that are starting to hold

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blocks I, II, and III zones. pre-30 air dryers in the zones of blocks i and II dryers are formed by sensors 30, 31, and 32 and are recorded by secondary devices 46, 47, and 48. In the controllers of these devices, command signals are generated The air conditioning regulating valves 14, 15 and 16 are adjusted to match 1e. The humidity of the dried emulsion layer at the outlets of blocks I, II and III of the dryer zone is converted by sensors 27, 28 and 29, the signals of which are recorded by secondary devices 43, 44 and 45. In these regulators devices are formed command signals correction tasks air humulators at the entrances to -5 blocks I, II and III of the dryer, which are supplied to the respective regulators of the secondary devices 46, 47 and 48,

At. When perturbing the impact of what has occurred, for example, changes in air temperature in the areas of the dryer, temperature sensors 17–24 send modified signals to secondary devices 33-40 and to the measuring parts of their regulators, where they are compared with given values, the error signals are received in the critical blocks of the regulators, processed in

in the latter, the new values of the temperature of the drying agent in accordance with the changed tasks. In this way, possible overheating of the emulsion layer is eliminated, leading, as a rule, to a deterioration of the physical and mechanical properties of the photographic material.

When the moisture content of the air at the inputs to blocks I, II, and III of the dryer is changed, the sensors 30, 31, and 32 supply the modified signals to the secondary devices 46, 47, and 48 and to the measuring parts of their regulators, where they are compared with the specified values, the error signals arrive In the decisive blocks of the regulators, they are processed in them according to the required, for example, proportional-integral, law of regulation and in the form of command signals go to the control valves of air conditioners 14, 15 and 16, which change the moisture content

55 air inlets to blocks I, II and III dryers so that

keep it at the given values.

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according to the required, for example, proportional-integral, law, and in the form of command signals, control valves come from the corresponding heaters 9-13 and

air conditioners 14, 15 and 16, which change the flow of coolant into them in such a way as to maintain in the areas of the dryer temperatures that are equal to W at given values, and thereby compensate for disturbing influences.

When changing the surface temperature of the dried emulsion layer of the material at the exit of the blocks

I and II dryers sensors 25 and 26

give the signals to the secondary devices 41 l 42 and to the measuring parts of their pelto tori, where they compare;: l-: with the given values, the error signals are sent to the decisive control units, processed in them, for example, proportional , the law of regulation and in the form of command signal devices 33–35 and 36–39 temperatures

ki that are starting to hold

air in zones of blocks i and II land

air in zones of blocks i and II

in the latter, the new values of the temperature of the drying agent in accordance with the changed tasks. In this way, possible overheatings of the emulsion layer are eliminated, leading, as a rule, to a deterioration of the physical and mechanical properties of the cinema photographic material.

When the moisture content of the air at the inputs to blocks I, II, and III of the dryer is changed, the sensors 30, 31, and 32 supply the modified signals to the secondary devices 46, 47, and 48 and to the measuring parts of their regulators, where they are compared with the specified values, the error signals arrive In the decisive blocks of the regulators, they are processed in them according to the required, for example, proportional-integral, law of regulation and in the form of command signals go to the control valves of air conditioners 14, 15 and 16, which change the moisture content

air inlets to blocks I, II and III dryers so that

keep it at the given values.

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As the moisture content of the dried emulsion layer of the material exits from blocks I, II, and III of the dryer, sensors 27, 28, and 29 transmit modified signals to secondary devices 43, 44, and 45 and to the measuring parts of their regulators, where they are compared with given values the error signals are sent to the decisive blocks of the regulators, processed in them according to the required, for example proportional-differential, law of regulation, and in the form of command signals are sent to the regulators of the secondary devices 46, 47 and 48 s start to keep on entering

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In the dryer units, the new values of air moisture content in accordance with the changed tasks.

Thus, the proposed method of regulating the drying process

At the outlet of block I, the su- and shiln stabilizes the humidity of the emulsion layer at the level of the critical humidity characteristic of this type of film, at the exit of the dryer unit II at the level of the value of a given moisture conditionally dry material, and at the exit of block III The saws are at the level of the equilibrium valency value, which improves the physicomechanical properties of the products.

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Compiled by S. Andrianova Editor M. Petrova Tehred V. Kadar - Proofreader A, Zimokosov

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Circulation 636 Subscription

VNSHPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35 ,, Raushsk nab. ., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR REGULATING THE DRYING PROCESS, which takes place in two periods in a multi-zone dryer, by adjusting the air temperature in each zone with a correction for the deviation of the surface temperature of the dried emulsion layer of the material, measured at the exit from the end zones of the periods of constant and falling drying speeds, from the set value and limitation according to its maximum values of air temperature, respectively, in the previous zones of the indicated periods, regulation of the moisture content of air at the entrance to the constant and falling drying speeds, as well as in stabilization zones with a correction for the moisture deviation of the dried emulsion layer of the material, measured at the exit from the end zones of the falling drying and stabilization speed period, from a predetermined value, characterized in that, in order to improve the quality of the product, mainly when the production of film materials on flexible substrates, by improving their physical and mechanical properties, additionally measure the humidity of the dried emulsion layer of the material at the exit from the zones of the period p the constant drying speed and when it deviates from the set value, the moisture content of the air at the entrance to them is adjusted. SU „„ 1320625