CN109813625B - Method for testing printing drying characteristics of water-based ink - Google Patents
Method for testing printing drying characteristics of water-based ink Download PDFInfo
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Abstract
The invention discloses a method for testing printing drying characteristics of water-based ink, which specifically comprises the following steps: setting parameters of a fan, a heating box and a mobile platform; selecting a printing stock sample; selecting an experimental sample on a printing stock sample; the test sample is placed on an analytical balance and the mass is weighed and recorded as M0(ii) a Marking the initial position of the experimental sample; drying the experimental sample in a microwave generator and under an air box in sequence, and keeping away from the air box after drying; collecting experimental data of an experimental sample; calculating the mass Ma of the experimental sample per unit area before drying: calculating the weight of the dried N samples in unit area; calculating the drying time of the first sample; calculating the drying time of the Nth sample; calculating the mass change amount [ Delta ] M of each sample per unit area before and after dryingn(ii) a According to the mass change amount [ Delta ] M of each sample per unit area before and after drying1The print drying rate was obtained. The invention can obtain the drying conditions of the ink under different conditions, thereby obtaining the drying rate of the ink.
Description
Technical Field
The invention belongs to the technical field of printing, and relates to a method for testing printing drying characteristics of water-based ink.
Background
In China, printing is mainly applied to the industries of food, tobacco and medicine packaging and is closely related to the life health of people. A large amount of volatile organic solvents are used in the traditional ink, so that the environment is polluted, and meanwhile, the residues of partial toxic substances are also unfavorable for the health of a human body. The development speed of human civilization is faster, the energy consumption is faster, sustainable development and green environmental protection become social trends, and the development and popularization of the water-based ink greatly improve the printing operation conditions, improve the product quality safety and are paid attention and favored by people. However, with the application of water-based ink, domestic printing equipment matched with the water-based ink has the problems of low drying efficiency, high energy consumption required for drying, long drying time, incomplete drying, low printing speed and the like. This directly affects the speed of the process of replacing solvent-based inks with water-based inks, and limits the wide use of water-based inks. Therefore, the study on the drying characteristics of the water-based ink has practical significance for the wide application of the water-based ink. Because the printing speed of printing enterprises is faster and faster, and the drying of printed matter printing ink needs certain time again, in order to guarantee the streamlined operation of printing production, hot-blast equipment is huge, and area is big, is unfavorable for developing the research. Therefore, it is desirable to develop a device for studying the drying rate of printed ink that is reasonable in structure, small in floor space, and easy to operate.
Disclosure of Invention
The invention aims to provide a method for testing the printing drying characteristics of water-based ink, which can obtain the drying condition of the ink under different conditions so as to know the drying rate of the ink.
The technical scheme adopted by the invention is that the method for testing the printing drying property of the water-based ink specifically comprises the following steps:
step 1, turning on a fan to set a wind speed VwOpening the heating box, setting the temperature to be T, preheating, and setting the moving speed of the moving platform to be V;
step 2, taking a printing stock sample with the width W and the length 1.5 times of the length of the mobile platform, wherein the width of W is the same as that of the mobile platform;
step 3, mixingPlacing the printing stock sample on a printability tester for inking, taking the middle part of the printing stock sample as an experimental sample, wherein the length of the experimental sample is L0；
Step 4, placing the experimental sample on an analytical balance, weighing the mass of the experimental sample, and recording the mass as M0；
Step 5, placing the experimental sample on a moving platform, pressing two ends of the experimental sample by using a magnet, wherein the length of the two ends of the experimental sample pressed by the magnet is not more than 10mm, and the moving platform is positioned on the left side of the bellows and is marked as an initial position;
step 6, starting a motor, starting a mobile platform to move, simultaneously starting a microwave generator, setting the power of the microwave generator to be P, drying the experimental sample in the microwave generator and under an air box in sequence, stopping moving when the mobile platform reaches the position right below the air box, and immediately moving the mobile platform away from the air box along a left slide rail and a right slide rail of the mobile platform to enable the mobile platform to be far away from the air box;
step 7, collecting experimental data of an experimental sample;
step 8, calculating the mass Ma of the test sample in unit area before drying:
step 9, calculating the weight of the dried N samples in unit area;
The present invention is also characterized in that,
the specific process of step 7 is that,
taking out the experimental sample from the movable platform, cutting off the left and right ends of the experimental sample by 10mm respectively, and putting the sample on the movable platformCutting the test sample into N equal parts as dried samples, respectively placing the N dried samples on N analytical balances, weighing the masses of the N test samples, and recording the mass of the dried sample with the longest drying time in a bellows as M1The mass of the other dried samples is sequentially recorded as M according to the descending order of the drying time2，M3. . . . . . And Mn, and finishing the acquisition of experimental data once.
The specific process of step 8 is as follows,
the mass Ma per unit area of the test sample before drying was calculated by the following formula (1):
the specific process of step 9 is to calculate M by the following formulab1、Mb2、Mb3、……、MbnWeight per unit area of these 1 to N samples:
calculating the weight of the dried N samples in unit area, specifically:
the specific process of step 10 is as follows:
the drying time of the first sample was calculated by the following equation (6):
the specific process of step 11 is as follows:
the drying time of the nth sample was calculated by the following formula (7):
the specific process of step 12 is that,
the mass change amount Δ M per unit area before and after drying of each sample was calculated by the following formula (8)n：
ΔMn＝Ma-MbnWherein N is 1, 2, … …, N (8).
The invention has the beneficial effects that different drying conditions of the printed matter are simulated by adjusting the temperature of hot air, the speed of the hot air and the frequency of microwaves, so that the printed samples under different drying conditions are obtained, and the mass changes of the printed samples in different time periods can be measured by matching with an analytical balance. The invention can be used for researching the drying rule of the printing ink and can be used for testing different printing drying working conditions.
Drawings
FIG. 1 is a schematic diagram of an apparatus for testing the drying characteristics of an aqueous ink according to the present invention;
FIG. 2 is a schematic back view of an apparatus for testing the drying characteristics of an aqueous ink according to the present invention;
FIG. 3 is a schematic view of a test apparatus for drying characteristics of water-based ink printing according to the present invention, with the support frame removed;
FIG. 4 is a schematic view of a structure of a screw bolt of a wind box and a guide plate in a testing apparatus for drying characteristics of water-based ink printing according to the present invention;
FIG. 5 is a schematic view showing the structure of a bellows base in the apparatus for testing the drying property of an aqueous ink according to the present invention;
FIG. 6 is a graph showing the relationship between the drying time of the ink and the mass difference before and after drying of the sample in the method for testing the drying characteristics of the water-based ink.
In the figure, 01, a control panel, 02, a motor, 03, a screw rod, 04, a moving platform, 05, a microwave generator, 06, a heating box, 07, a vent pipe, 08, a bellows adjusting bolt, 09, a bellows, 10, a moving platform right slide rail, 11, a moving platform right slide block, 12, a fan, 13, a polished rod, 14, a moving platform left slide rail, 15, a moving platform left slide block, 16, a photoelectric baffle, 17, a rear photoelectric switch, 18, a front photoelectric switch, 19, a bellows right slide block, 20, a bellows right slide rail, 21, a bellows left slide block, 22, a bellows left slide rail, 23, a rack, 24, a support frame, 25, a frame body, 26, an air guide pipe, 27, a guide sheet, 28, a nozzle seat, 29, an air baffle, 30, a nozzle baffle and 31, a nozzle.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a test method of printing drying characteristics of water-based ink, which adopts a test instrument of printing drying characteristics of water-based ink, and as shown in figures 1-3, the test instrument comprises a rack 23, wherein a screw rod 03 and a polished rod 13 which are parallel to each other are arranged on the rack 23, the screw rod 03 and the polished rod 13 both penetrate through a microwave generator 05, one end of the screw rod 03 and one end of the polished rod 13 are both supported by a left sliding block 15 of a moving platform, the left sliding block 15 of the moving platform is matched with a left sliding rail 14 of the moving platform, one end of the screw rod 03 is connected with a motor 02, the screw rod 03 is also matched and connected with a moving platform 04, the polished rod 13 penetrates through the middle of the moving platform 04, and the polished rod 13 plays a guiding role on the moving platform 04; one end of the frame 23 is provided with an air box 09, and the air box 09 is positioned above the moving platform 04; the length of the moving platform 04 is greater than the length of the bellows 09.
The other end of the screw rod 03 and the other end of the polished rod 13 are both supported by a right sliding block 11 of the mobile platform, and the right sliding block 11 of the mobile platform is matched with a right sliding rail 10 of the mobile platform;
the left sliding rail 14 of the mobile platform and the right sliding rail 10 of the mobile platform are respectively positioned at the left end and the right end of the frame 23 and are arranged in parallel;
one side of one end of the rack 23 is provided with a support frame 24 along the vertical direction, the inner side of the support frame 24 is provided with an air box right slide rail 20 and an air box left slide rail 22 which are parallel to each other along the vertical direction, the air box right slide rail 20 is matched with an air box right slide block 19, the air box left slide rail 22 is matched with an air box left slide block 21, and the air box right slide block 19 and the air box left slide block 21 are both arranged on the same side surface of the air box 09;
a heating box 06 is arranged above the air box 09, the heating box 06 is connected to the support frame 24 through a frame body 25, an air outlet of the heating box 06 is connected into the air box 09 through an air guide pipe 26, and an air box adjusting bolt 08 is arranged on the frame body 25 along the vertical direction;
as shown in fig. 4, the bellows adjusting bolt 08 is engaged with the guide tab 27, the center of the guide tab 27 is provided with a threaded hole for engaging with the bellows adjusting bolt 08, and the guide tab 27 is provided on the same side of the bellows 09 as the right bellows slider 19 and the left bellows slider 21; the bellows adjusting bolt 08 is rotated, and the bellows 09 can move up and down along the bellows right slide block 19 and the bellows left slide block 21 due to the mutual matching of the bellows adjusting bolt 08 and the threaded hole on the guide vane 27;
an air inlet of the heating box 06 is connected with the fan 12 through a vent pipe 07.
The other end of the frame 23 is provided with a control panel 01, and the control panel 01 can control the moving speed of the moving platform 04, adjust the temperature of the heating box 06, the wind speed of the fan 12 and adjust the microwave power of the microwave generator 05. The control panel 01 is provided with a display screen which can read the moving speed of the moving platform 04, the temperature of wind passing through the heating box 06, the wind speed and the numerical value of microwave power. The control panel 01 also includes a timer. The timer is started when the motor 02 is started, and is stopped when the motor 02 is stopped.
One end of the moving platform 04 is provided with a photoelectric baffle 16, the rack 23 is respectively provided with a rear photoelectric switch 17 and a front photoelectric switch 18, the rear photoelectric switch 17 is arranged close to the motor 02, the front photoelectric switch 18 is arranged between the air box 09 and the microwave generator 05, when the photoelectric baffle 16 passes through the rear photoelectric switch 17 or the front photoelectric switch 18, the motor 02 stops rotating, the moving platform 04 stops moving, and when the photoelectric baffle 16 moves to the position of the front photoelectric switch 18, the moving platform 04 is just positioned under the air box 09.
As shown in fig. 5, a plurality of nozzles 31 are uniformly distributed at the bottom of the air box 09, a nozzle seat 28 is arranged at the bottom of the air box 09, wind blocking plates 29 are respectively arranged at two opposite sides of the nozzle seat 28, a plurality of pairs of L-shaped nozzle blocking plates 30 are equidistantly arranged between the two wind blocking plates 29, in the pair of nozzle blocking plates 30, one side edges of the two nozzle blocking plates 30 are spliced to form the nozzles 31, the wind generated by the fan 12 enters the air box 09 after being heated by the heating box 06, and the wind generated by the fan 12 enters the air box 09 after being heated by the heating box 06 and is led out from the nozzles 31 at the bottom of the risk 09.
The air nozzle baffle 30 is fixed on the air nozzle base 28 through bolts, the air baffle 29 is locked through screws until the air nozzle baffle 30 is clamped, and the air nozzle base 28 adopts a drawing structure and can be installed at the bottom of the air box 09.
The microwave generator 05 may generate microwaves. The moving platform 04 passes through the microwave generator 05 and then reaches below the bellows 09.
The invention relates to a method for testing printing drying characteristics of water-based ink, which comprises the following steps:
the fan 12 is turned on to set the wind speed VwThe heating box 06 is opened to set the temperature T for preheating, and preheating is required for 20 minutes to ensure uniform temperature of hot air flowing out from the tuyere of the bellows 09.
And (3) taking a printing stock sample with the width W and the length 1.5 times of the length of the movable platform 04, wherein the width of W is the same as that of the movable platform 04. The length of the windbox 09 is L.
Placing the printing stock sample on a printability tester to ink the printing stock sample, taking the middle part of the printing stock sample as an experimental sample, wherein the length of the experimental sample is the length of a bellows 09 plus 20mm and is marked as L0The middle part of the substrate sample is chosen in mm because the printing effect is the best in the middle part of the substrate and the ink layer thickness is the most uniform.
The test sample is placed on an analytical balance and the mass is weighed and recorded as M0，g；
Placing the experimental sample on a moving platform 04, pressing two ends of the experimental sample by using a magnet, wherein the length of the two ends of the experimental sample pressed by the magnet is not more than 10mm, and the moving platform 04 is positioned on the left side of an air box 09 and is marked as an initial position;
the moving speed of the moving platform 04 is set to be V, m/s.
Starting a motor, starting the moving platform 04 to move, simultaneously starting the microwave generator 05, setting the power of the microwave generator 05 as P, drying the experimental sample in the microwave generator 05 and under the bellows 09 in sequence, stopping moving when the moving platform 04 reaches the position right below the bellows 09, and immediately moving the moving platform 04 away from the bellows 09 along the left moving platform slide rail 14 and the right moving platform slide rail 10 to enable the moving platform 04 to be far away from the bellows 09;
taking out the experimental sample from the moving platform 04, cutting off 10mm from each of the left end and the right end of the experimental sample, cutting the experimental sample into N equal parts serving as dried samples, respectively placing the N dried samples on N analytical balances, weighing the masses of the N experimental samples, and recording the mass of the dried sample which enters the bellows 09 and has the longest drying time as M1(unit g), the masses of the other dried samples are recorded as M in the order of decreasing drying time2，M3. . . . . . Mn, finishing the acquisition of experimental data for one time;
the mass Ma (in g) per unit area of the test sample before drying was calculated by the following formula (1):
the weight per unit area of the dried sample was:
the drying time after drying of the first sample was, in units of s:
the drying time after drying for the nth sample was:
mass change amount Δ M per unit area before and after drying of each samplen(in g) is:
ΔMn＝Ma-Mbnwherein N is 1, 2, … …, N (8);
according to the mass change (mass difference) Δ M per unit area before and after drying of each sample1,ΔM2......ΔMnRespectively corresponding drying time t1，t2......tn(in s) to obtain an ink drying curve, as shown in FIG. 6 (FIG. 6 is a graph of the mass difference Δ M before and after drying of the sample and the drying time t), the slope of the curve is the print drying rate.
Claims (1)
1. The testing method for the printing drying characteristic of the water-based ink is characterized by comprising a rack, wherein a lead screw and a polished rod which are parallel to each other are arranged on the rack, the lead screw and the polished rod both penetrate through a microwave generator, one end of the lead screw and one end of the polished rod are both supported by a left sliding block of a moving platform, the left sliding block of the moving platform is matched with a left sliding rail of the moving platform, one end of the lead screw is connected with a motor, the lead screw is also matched and connected with the moving platform, and the polished rod penetrates through the middle of the moving platform; one end of the frame is provided with an air box which is positioned above the movable platform; the length of the movable platform is greater than that of the bellows;
the other end of the screw rod and the other end of the polished rod are both supported by a right sliding block of the mobile platform, and the right sliding block of the mobile platform is matched with a right sliding rail of the mobile platform;
the left sliding rail and the right sliding rail of the mobile platform are respectively positioned at the left end and the right end of the rack and are arranged in parallel;
one side of one end of the rack is provided with a support frame along the vertical direction, the inner side of the support frame is provided with an air box right slide rail and an air box left slide rail which are parallel to each other along the vertical direction, the air box right slide rail is matched with an air box right slide block, the air box left slide rail is matched with an air box left slide block, and the air box right slide block and the air box left slide block are both arranged on the same side surface of the air box;
a heating box is arranged above the air box, the heating box is connected to the support frame through a frame body, an air outlet of the heating box is connected into the air box through an air guide pipe, and an air box adjusting bolt is arranged on the frame body along the vertical direction;
the air box adjusting bolt is matched with the guide piece, the center of the guide piece is provided with a threaded hole matched with the air box adjusting bolt, and the guide piece, the air box right sliding block and the air box left sliding block are arranged on the same side surface of the air box;
an air inlet of the heating box is connected with a fan through a vent pipe;
a plurality of air nozzles are uniformly distributed at the bottom of the air box, an air nozzle seat is arranged at the bottom of the air box, wind shields are respectively arranged at two opposite sides of the air nozzle seat, a plurality of pairs of L-shaped air nozzle baffles are arranged between the two wind shields at equal intervals, and one side edge of each of the two air nozzle baffles is spliced to form the air nozzle;
the method specifically comprises the following steps:
step 1, turning on a fan to set a wind speed VwOpening the heating box, setting the temperature to be T, preheating, and setting the moving speed of the moving platform to be V;
step 2, taking a printing stock sample with the width W and the length 1.5 times of the length of the mobile platform, wherein the width of W is the same as that of the mobile platform;
step 3, placing the printing stock sample on a printability tester for inking, taking the middle part of the printing stock sample as an experimental sample, wherein the length of the experimental sample is L0；
Step 4, placing the experimental sample on an analytical balance, weighing the mass of the experimental sample, and recording the mass as M0；
Step 5, placing the experimental sample on a moving platform, pressing two ends of the experimental sample by using a magnet, wherein the length of the two ends of the experimental sample pressed by the magnet is not more than 10mm, and the moving platform is positioned on the left side of the bellows and is marked as an initial position;
step 6, starting a motor, starting a mobile platform to move, simultaneously starting a microwave generator, setting the power of the microwave generator to be P, drying the experimental sample in the microwave generator and under an air box in sequence, stopping moving when the mobile platform reaches the position right below the air box, and immediately moving the mobile platform away from the air box along a left slide rail and a right slide rail of the mobile platform to enable the mobile platform to be far away from the air box;
step 7, collecting experimental data of an experimental sample;
step 8, calculating the mass Ma of the test sample in unit area before drying:
step 9, calculating the weight of the dried N samples in unit area;
step 10, calculating the drying time of the first sample;
step 11, calculating the drying time of the Nth sample;
step 12, calculating the mass change amount Δ M per unit area before and after drying each samplen；
Step 13, according to the mass change amount Delta M of each sample per unit area before and after drying1,ΔM2......ΔMnRespectively corresponding drying time t1，t2......tnObtaining an ink drying change curve, wherein the slope of the curve is the printing drying rate;
the specific process of the step 7 is that the experimental sample is taken out of the mobile platform, the left end and the right end of the experimental sample are cut off by 10mm respectively, and then the experimental sample is cut into N equal parts to be used as the dried sampleRespectively placing the N dried samples on N analytical balances, weighing the masses of the N experimental samples, and recording the mass of the dried sample with the longest drying time entering a bellows as M1The mass of the other dried samples is sequentially recorded as M according to the descending order of the drying time2，M3.... Mn, at which time the acquisition of experimental data is completed once;
the specific process of the step 8 is that,
the mass Ma per unit area of the test sample before drying was calculated by the following formula (1):
the specific process of step 9 is to calculate M by the following formulab1、Mb2、Mb3、……、MbnWeight per unit area of these 1 to N samples:
the specific process of step 10 is as follows:
the drying time of the first sample was calculated by the following equation (6):
the specific process of the step 11 is as follows:
the drying time of the nth sample was calculated as follows:
the specific process of the step 12 is that,
the mass change amount Δ M per unit area before and after drying of each sample was calculated by the following formula (8)n：
ΔMn＝Ma-MbnWherein N is 1, 2, … …, N (8).
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Effective date of registration: 20210811 Address after: 064100 caitingqiao industrial community, Yutian County, Tangshan City, Hebei Province Patentee after: HEBEI WANJIE MACHINERY TECHNOLOGY Co.,Ltd. Address before: 710048 No. 5 Jinhua South Road, Shaanxi, Xi'an Patentee before: XI'AN University OF TECHNOLOGY |
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Denomination of invention: A Test Method for Drying Characteristics of Waterborne Ink Printing Effective date of registration: 20230825 Granted publication date: 20210720 Pledgee: China Merchants Bank Limited by Share Ltd. Tangshan branch Pledgor: HEBEI WANJIE MACHINERY TECHNOLOGY CO.,LTD. Registration number: Y2023980053743 |