CN108717047B - Stripping effect evaluation method for stripping agent - Google Patents
Stripping effect evaluation method for stripping agent Download PDFInfo
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- CN108717047B CN108717047B CN201810511737.8A CN201810511737A CN108717047B CN 108717047 B CN108717047 B CN 108717047B CN 201810511737 A CN201810511737 A CN 201810511737A CN 108717047 B CN108717047 B CN 108717047B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/251—Colorimeters; Construction thereof
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Abstract
The invention relates to a method for evaluating the stripping effect of a stripping agent, which adopts a printing adaptability instrument in the prior art to simulate a smooth roller and a rubber roller in a paper machine, uses offset printing ink to simulate stickies in the paper machine, and can evaluate the stripping effect of a target stripping agent before actual production and use, thereby reducing resource waste caused by poor effect of the stripping agent; meanwhile, the method for evaluating the stripping effect of the stripping agent has the advantages of simplicity, accuracy and strong practicability.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a stripping effect evaluation method for a stripping agent.
Background
Stickies are one of the important obstacles affecting paper quality and machine operation in pulp and paper making. The stickies are easy to adhere to the surface of the roller of the press part of the paper machine due to the viscosity, and then are transferred to the paper surface or the press felt or the dry part dry net in the paper production process, and the appearance of the paper surface or the dewatering air permeability of the press felt or the dry part dry net is influenced. The stripping agent is used as a common process auxiliary agent in the papermaking process, can wrap the adhesive by being added into paper pulp or spraying a roller of a squeezing part, and is discharged through a spraying cleaning system, so that the adhesive on the roller is prevented from being transferred to paper, squeezing felt or a dry net.
The quality of the stripping effect of the stripping agent directly determines the quality of the appearance of the paper surface. However, since the types of release agents are wide and the release effect of the release agents is difficult to evaluate, there is no standard evaluation method for the release agents for evaluating the release effect of the release agents.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for evaluating the stripping effect of a stripping agent, which adopts the following technical scheme:
a peeling effect evaluation method for a peeling agent, which evaluates a peeling effect of the peeling agent using a printing adaptability meter.
Specifically, the method comprises the following steps:
s1, placing the coated paper into a paper clamp of a printing adaptability instrument;
s2, adding offset printing ink on a smooth roller of the printing adaptability instrument, starting the printing adaptability instrument, keeping the smooth roller and a rubber roller in contact, and performing first ink evening;
s3, stopping ink homogenizing, adding a stripping agent to a rubber roller of the printing adaptability instrument, starting the printing adaptability instrument, keeping a smooth roller and the rubber roller in contact, and performing second ink homogenizing;
s4, stopping ink homogenizing, keeping the smooth roller and the rubber roller separated, starting a paper clamp rotating switch, and transferring the ink on the surface of the rubber roller to coated paper to obtain test paper;
s5, detecting the color value of the test paper to be b1 by using a color detector.
S6, repeating the steps S1-S5 without adding a stripping agent to obtain a control paper, and detecting the color value of the control paper to be b0 by using a color detector.
S7, the peeling effect of the peeling agent is represented by a peeling coefficient S, and the peeling coefficient calculation formula is (b0-b1)/b 0.
Preferably, the coated paper is single-side coated grey white cardboard or white board paper, and the printing strength of the coated paper is not less than 2 times of printing times of a printing adaptability instrument.
Preferably, the mass of the release agent is greater than the mass of the flexographic ink.
Preferably, the viscosity of the release agent is not less than 700 mPas
Preferably, the offset printing ink is yellow or red in color.
Preferably, the flexographic printing ink has a mass of no more than 0.3 grams.
Preferably, the first leveling time is not less than 1 minute, and the second leveling time is not less than 2 minutes.
Preferably, the mass of the offset printing ink is 0.3 grams and the mass of the release agent is 0.5 grams.
Preferably, the first leveling time is 3 minutes, and the second leveling time is 2 minutes.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the method for evaluating the stripping effect of the stripping agent, the smooth roller and the rubber roller of a paper machine are respectively simulated by adopting the smooth roller and the rubber roller with printing adaptability, the offset printing ink is adopted to simulate stickies, the color value of the coated paper is detected by using the color detector, the stripping coefficient of the stripping agent is calculated according to the color value, and the larger the stripping coefficient is, the better the stripping effect of the stripping agent is. The stripping effect evaluation method provided by the invention has the advantages of simple method, strong operability and accurate data.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Printing adaptability instrument: the manufacturer: IHI Machinery and burn co., ltd., model: RI-3;
a color detector: the manufacturer: technidyne corporation, model: ctpa 2204;
printing ink of a yellow offset plate: the manufacturer: hangzhou ink chemistry, model number: BX-7230 quick-drying bright transparent yellow ink;
single-side coating of grey white cardboard: the manufacturer: jiulong paper industry (Taicang) Co., Ltd; the model is as follows: coating one side of the earthworm card with grey white cardboard (300 g/square meter);
stripping agent: soris (Shanghai) chemical Co., Ltd; the model is as follows: roll stripper DR 3900.
The method for evaluating the peeling effect of the peeling agent is as follows:
1. the printing pressure is adjusted in advance according to the thickness of the paper, so that a 6mm wide mark is left on the paper tightly attached to the smooth roller by the rubber roller with uniformly distributed ink;
2. cleaning the smooth roller, the rubber roller and the surface of the printing cylinder by using gasoline, and transferring the printing cylinder to a position where the paper clip clamp automatically opens;
3. cutting the single-side coated grey white cardboard into a size with the length and the width of 270mm, and putting the cut white cardboard into a printing-adaptive paper clamp and clamping the white cardboard;
4. sucking 0.3mL of yellow rubber plate printing ink by using a metal ink injector, coating the yellow rubber plate printing ink on a smooth roller of a printing adaptability instrument, keeping the smooth roller in contact with a rubber roller, starting the printing adaptability instrument, and homogenizing the ink for 3 minutes to uniformly disperse the ink;
5. stopping ink homogenizing, sucking 0.5mL of stripping agent by using a suction pipe, coating the stripping agent on a rubber roller of a printing adaptability instrument, keeping a smooth roller in contact with the rubber roller, starting the printing adaptability instrument, homogenizing the ink for 2 minutes, and fully contacting the stripping agent with the ink;
6. and stopping ink homogenizing, separating the smooth roller and the rubber roller, and opening a paper clamp rotating switch to print the ink on the surface of the rubber roller onto the cut white cardboard to obtain the test paper. After 5 minutes, the test paper was tested for b1 color by a color detector to 38.62;
7. the operations 4, 5 and 6 were repeated without adding peeling to obtain a control paper. After 5 minutes, the control paper was tested for b 2 color by color tester as 82.56;
8. the release effect of the release agent is represented by a release coefficient S, and the formula for calculating the release coefficient is (82.56-38.62)/82.56 is 0.53.
The above embodiments are described in detail for the purpose of illustration, and it is not intended that the invention be limited thereto, but rather that the invention be construed as broadly as the invention will be apparent to those skilled in the art, and all equivalent variations and modifications which fall within the spirit and scope of the invention are therefore intended to be embraced therein.
Claims (9)
1. A method for evaluating the peeling effect of a peeling agent, characterized in that the method uses a printing adaptability tester to evaluate the peeling effect of the peeling agent,
the peeling effect evaluation method comprises the following steps:
s1, placing the coated paper into a paper clamp of a printing adaptability instrument;
s2, adding offset printing ink on a smooth roller of the printing adaptability instrument, starting the printing adaptability instrument, keeping the smooth roller and a rubber roller in contact, and performing first ink evening;
s3, stopping ink homogenizing, adding a stripping agent to a rubber roller of the printing adaptability instrument, starting the printing adaptability instrument, keeping a smooth roller and the rubber roller in contact, and performing second ink homogenizing;
s4, stopping ink homogenizing, keeping the smooth roller and the rubber roller separated, starting a paper clamp rotating switch, and transferring the ink on the surface of the rubber roller to coated paper to obtain test paper;
s5, detecting the color value of the test paper to be b1 by using a color detector;
s6, under the condition that no stripping agent is added, repeating the steps S1-S5 to obtain a contrast paper, and detecting the color value of the contrast paper to be b0 by using a color detector;
s7, the peeling effect of the peeling agent is represented by a peeling coefficient S, and the peeling coefficient calculation formula is (b0-b1)/b 0.
2. The method for evaluating a peeling effect according to claim 1, wherein the coated paper is a single-coated gray-backed white cardboard or a white board paper, and the printing strength of the coated paper is not less than 2 times of printing by a printing suitability meter.
3. The method for evaluating a peeling effect according to claim 2, wherein the quality of the peeling agent is larger than that of the offset printing ink.
4. The method of evaluating a peeling effect according to claim 3, wherein the viscosity of the peeling agent is not less than 700 mPa-s.
5. The method for evaluating a peeling effect according to claim 4, wherein the color of the offset printing ink is yellow or red.
6. The method for evaluating a peeling effect according to claim 5, wherein the mass of the offset printing ink is not more than 0.3 g.
7. The peeling effect evaluation method according to claim 6, wherein the first leveling time is not less than 1 minute, and the second leveling time is not less than 2 minutes.
8. The method for evaluating a peeling effect according to claim 7, wherein the mass of the offset printing ink is 0.3 g, and the mass of the peeling agent is 0.5 g.
9. The peeling effect evaluation method according to claim 8, wherein the first leveling time is 3 minutes, and the second leveling time is 2 minutes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011186859.8A CN112630166B (en) | 2018-05-25 | 2018-05-25 | Stripping effect evaluation method for stripping agent |
| CN201810511737.8A CN108717047B (en) | 2018-05-25 | 2018-05-25 | Stripping effect evaluation method for stripping agent |
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| CN201810511737.8A CN108717047B (en) | 2018-05-25 | 2018-05-25 | Stripping effect evaluation method for stripping agent |
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| CN112630166A (en) | 2021-04-09 |
| CN112630166B (en) | 2022-11-15 |
| CN108717047A (en) | 2018-10-30 |
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