CN116879276A - Paper powder identification method - Google Patents
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- CN116879276A CN116879276A CN202310929955.4A CN202310929955A CN116879276A CN 116879276 A CN116879276 A CN 116879276A CN 202310929955 A CN202310929955 A CN 202310929955A CN 116879276 A CN116879276 A CN 116879276A
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- paper powder
- sizing agent
- paper
- powder sample
- synthetic sizing
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- 239000000843 powder Substances 0.000 title claims abstract description 155
- 238000000034 method Methods 0.000 title claims abstract description 81
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000004043 dyeing Methods 0.000 claims abstract description 23
- 238000004513 sizing Methods 0.000 claims description 101
- 239000003795 chemical substances by application Substances 0.000 claims description 98
- 239000000413 hydrolysate Substances 0.000 claims description 70
- 239000000428 dust Substances 0.000 claims description 48
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 29
- 239000002253 acid Substances 0.000 claims description 26
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 10
- 238000001228 spectrum Methods 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000002329 infrared spectrum Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- 230000003301 hydrolyzing effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000012192 staining solution Substances 0.000 description 9
- 239000002390 adhesive tape Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 210000002268 wool Anatomy 0.000 description 6
- 108010009736 Protein Hydrolysates Proteins 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
-
- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
-
- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N2021/757—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated using immobilised reagents
Abstract
The application provides a paper powder identification method, which comprises the following steps: taking a proper amount of paper powder sample; mixing a fiber dyeing liquid with the paper powder sample; and observing whether the paper powder sample changes color, and if so, judging that the paper powder sample comprises papermaking fibers. The paper powder identification method provided by the embodiment of the application can rapidly distinguish the types of the paper powder, is convenient for controlling the production process, improves the production efficiency and ensures the safe production.
Description
Technical Field
The application relates to the technical field of paper powder type detection in the paper making production process, in particular to a paper powder identification method.
Background
Paper Mao Zhifen is a common problem in coated paper production. Because the processes of slitting, rewinding, packaging and the like are required to be carried out on the large paper roll according to the use requirements of customers after the production of the coated paper is finished, paper diseases such as paper dust can occasionally occur in the production processes.
The common paper wool paper powder is divided into 3 types.
1. And calcium carbonate powder. The formation cause is as follows: coated paper has poor bonding strength, and the pigment (mainly calcium carbonate) in the coating is fallen off due to the contact friction of the paper with equipment in the post-production stage.
2. Fibrous debris. The formation cause is as follows: typically, in the process of slitting coated paper in a roll or in a flat length, the cutter is not sharp enough to cause chipping of the paper edge fibers.
3. Synthetic sizing agent hydrolysate paper powder. The formation cause is as follows: the synthetic sizing agent is used for internal sizing or surface sizing of paper. When the sizing liquid is added in excess or the sizing liquid is hydrolyzed excessively during use, the produced by-products are caused by the product produced by re-reaction with the papermaking filler raw material.
The problems are as follows: 1. the appearance form and the color of the 3 kinds of paper wool paper powder are similar, and cannot be distinguished by visual inspection. 2. These 3 powders are all finer and have a large component span. (calcium carbonate is inorganic salt, fiber scraps are biological fibers, and synthetic sizing agent hydrolysate paper powder is organic matters). Multiple equipment is needed for analysis, and the analysis period is long. 3. The synthetic sizing agent hydrolysate paper powder is a chemical reaction product and has certain hysteresis. Usually 1-6 months are required to find out, which is unfavorable for the control and adjustment of the production process.
Disclosure of Invention
An embodiment of the present application provides a method for identifying paper dust, where the method includes:
taking a proper amount of paper powder sample;
mixing a fiber dyeing liquid with the paper powder sample;
and observing whether the paper powder sample changes color, and if so, judging that the paper powder sample comprises papermaking fibers.
Wherein the fiber staining solution is Graff 'C' staining solution, and in the step of observing whether the paper powder sample changes color, observing whether the paper powder sample changes into blue-black.
Wherein the authentication method further comprises the steps of: placing the paper powder sample in an acid solution; and observing whether the paper powder sample is at least partially dissolved and bubbles are generated, and if so, judging that the paper powder sample comprises calcium carbonate.
Wherein the acid solution is dilute hydrochloric acid.
Wherein, the identification method is that in the step of placing the paper dust sample in an acid solution, the acid solution is excessive, and the identification method further comprises the steps of, after the step of placing the paper dust sample in the acid solution: and observing whether a paper powder sample floating on the surface of the acid solution exists or not, and if so, judging that the paper powder sample comprises a synthetic sizing agent hydrolysate.
Wherein the authentication method further comprises the steps of: taking a proper amount of known synthetic sizing agent; hydrolyzing the known synthetic sizing agent to obtain a hydrolysate; and observing and comparing the synthetic sizing agent hydrolysate contained in the paper powder sample with the known synthetic sizing agent hydrolysate by using a microscope, and judging that the synthetic sizing agent hydrolysate contained in the paper powder sample and the known synthetic sizing agent hydrolysate are the same material if the comparison is consistent.
Wherein the step of hydrolyzing the synthetic sizing agent to obtain a hydrolysate specifically comprises: a suitable amount of water and alkaline solution are added to the known synthetic sizing agent and then placed in an oven for 3-5 hours to allow for sufficient hydrolysis.
Wherein the authentication method further comprises the steps of: taking a proper amount of known synthetic sizing agent; hydrolyzing the known synthetic sizing agent to obtain a hydrolysate; and comparing the spectrums of the synthetic sizing agent hydrolysate and the known synthetic sizing agent hydrolysate contained in the paper powder sample by using an infrared spectrum detector, and judging that the synthetic sizing agent hydrolysate and the known synthetic sizing agent hydrolysate contained in the paper powder sample are the same material if the spectrums are consistent.
In a second aspect, an embodiment of the present application provides a method for identifying paper dust, where the method includes:
taking a proper amount of paper powder sample;
placing the paper powder sample in an acid solution;
and observing whether the paper powder sample is at least partially dissolved and bubbles are generated, and if so, judging that the paper powder sample comprises calcium carbonate.
In a third aspect, an embodiment of the present application provides a method for identifying paper dust, where the method includes:
taking a proper amount of paper powder sample;
placing the paper dust sample in an excess of an acid solution;
and observing whether a paper powder sample floating in the acid solution exists or not, if so, comparing the synthetic sizing agent hydrolysate contained in the paper powder sample with the known synthetic sizing agent hydrolysate by using an optical instrument, and if the comparison is consistent, judging that the synthetic sizing agent hydrolysate contained in the paper powder sample and the known synthetic sizing agent hydrolysate are the same material.
The paper powder identification method provided by the embodiment of the application can rapidly distinguish the types of the paper powder, is convenient for controlling the production process, improves the production efficiency and ensures the safe production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an embodiment of a method for identifying paper dust according to the present application;
FIG. 2 is a flow chart of another embodiment of the method for identifying paper dust according to the present application;
FIG. 3 is a flow chart of a method for identifying paper dust according to another embodiment of the present application;
FIG. 4 is a schematic flow chart of one embodiment of a method of determining the type of synthetic sizing agent hydrolysate according to the present application;
FIG. 5 is a schematic flow chart of another embodiment of a method of determining the type of synthetic sizing agent hydrolysate according to the present application;
FIG. 6a is a schematic view of a microscopic enlarged structure of a synthetic sizing agent hydrolysate paper powder;
FIG. 6b is a schematic view of a microscopic magnification of another synthetic size hydrolysate paper powder;
FIG. 6c is a schematic diagram of the structure of a further synthetic sizing agent hydrolysate paper powder;
FIG. 7 is a schematic view of the microstructure of a microscopic piece of fiber-chipped paper powder;
FIG. 8 is a schematic view of the microstructure of a calcium carbonate paper powder under a microscope;
fig. 9 is a graph of the test infrared spectra of three materials, white powder and synthetic sizing agent hydrolysate A, B in example three.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present application, but do not limit the scope of the present application. Likewise, the following examples are only some, but not all, of the examples of the present application, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present application.
The terms "first," "second," "third," and the like in embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back … …) in embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. The terms "comprising" and "having" and any variations thereof in embodiments of the present application are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a flow chart of an embodiment of a paper dust identification method according to the present application, which includes, but is not limited to, the following steps.
And step S100, taking a proper amount of paper powder sample.
In this step, a paper dust sample may be specifically adhered with an adhesive tape, and the sample is white flocculent.
With continued reference to fig. 1, the identification method in this embodiment further includes step S200 of mixing the fiber dyeing liquid with the paper powder sample.
In step S200, 2-5 drops of fiber dyeing liquid may be sucked, wherein the fiber dyeing liquid may be Graff "C" dyeing liquid (i.e. glaf "C" model dyeing liquid), and the fiber dyeing liquid is dropped on the surface of the paper powder sample.
With continued reference to fig. 1, the identification method in this embodiment further includes step S300, in which it is observed whether the paper dust sample is discolored.
In this step, if the color is changed, the process proceeds to step S310, and it is determined that the paper dust sample includes papermaking fibers, and if the color is not changed, the process proceeds to step S320, and it is determined that the paper dust sample does not include papermaking fibers.
Alternatively, if the color is changed, the paper powder sample can be gradually changed from white to blue-black under the action of Graff 'C' staining solution, and when the color is no longer changed, the paper powder sample is photographed and retained by a microscope.
Referring to fig. 2, fig. 2 is a flow chart of another embodiment of the paper dust identification method according to the present application, which includes, but is not limited to, the following steps.
And step S100, taking a proper amount of paper powder sample.
In this step, a paper dust sample may be specifically adhered with an adhesive tape, and the sample is white flocculent.
With continued reference to fig. 2, the identification method in this embodiment further includes step S200 of mixing the fiber dyeing liquid with the paper powder sample.
In step S200, 2-5 drops of fiber dyeing liquid may be sucked, wherein the fiber dyeing liquid may be Graff "C" dyeing liquid, and the fiber dyeing liquid is dropped on the surface of the paper powder sample.
With continued reference to fig. 2, the identification method in this embodiment further includes step S300, in which it is observed whether the paper dust sample is discolored.
In this step, if the color is changed, the process proceeds to step S310, and it is determined that the paper dust sample includes papermaking fibers, and if the color is not changed, the process proceeds to step S320, and it is determined that the paper dust sample does not include papermaking fibers.
Alternatively, if the color is changed, the paper powder sample can be gradually changed from white to blue-black under the action of Graff 'C' staining solution, and when the color is no longer changed, the paper powder sample is photographed and retained by a microscope.
Unlike the previous embodiment, the identification method in this embodiment further includes step S400 of placing the paper dust sample in an acid solution.
In this step, a dilute hydrochloric acid solution may be used, and the concentration may be 0.1%.
With continued reference to fig. 2, the identification method in this embodiment further includes step S500, observing whether the paper powder sample is at least partially dissolved and generates bubbles.
In step S500, if the paper powder sample is at least partially dissolved and bubbles are generated, step S510 is performed to determine that calcium carbonate is included in the paper powder sample, and if the paper powder sample is not dissolved and bubbles are not generated, step S520 is performed to determine that calcium carbonate is not included in the paper powder sample.
The identification method in this example can also be used to identify whether the paper dust is a mixture of calcium carbonate and papermaking fibers.
It should be noted that, the process of step S400 and step S500 for detecting whether the paper dust sample includes calcium carbonate may be a separate method flow, and may not adhere to or be carried after the step of detecting whether the paper dust sample includes papermaking fibers.
Referring to fig. 3, fig. 3 is a flow chart of a paper dust identification method according to another embodiment of the application, and the identification method includes, but is not limited to, the following steps.
And step S100, taking a proper amount of paper powder sample.
Step S200, mixing the fiber dyeing liquid with the paper dust sample.
And step S300, observing whether the paper powder sample changes color.
Step S400, placing the paper dust sample in an acid solution. Optionally, in step S400, the acid solution is in excess, if calcium carbonate is present, to ensure that the calcium carbonate can be fully reacted away.
Step S500, observe whether the paper dust sample is at least partially dissolved and bubbles are generated.
The other detailed features of step S100 to step S500 are described in the foregoing embodiments, and are not repeated here.
Unlike the previous embodiment, the paper dust identification method of the present embodiment further includes step S600 of observing whether there is a paper dust sample floating on the surface of the acid solution.
In this step, if there is a paper dust sample floating on the surface of the acid solution, the process proceeds to step S610, and it is determined that the paper dust sample includes a synthetic sizing agent hydrolysate, and if there is no paper dust sample floating on the surface of the acid solution, the process proceeds to step S620, and it is determined that the paper dust sample does not include a synthetic sizing agent hydrolysate.
If it is determined that the paper dust sample includes a synthetic sizing agent hydrolysate, embodiments of the present application may further include the step of further determining what synthetic sizing agent hydrolysate is. Referring to fig. 4, fig. 4 is a schematic flow chart of an embodiment of a method for determining the type of a hydrolysate of a synthetic sizing agent according to the present application, wherein the method comprises the following steps.
Step S621, taking a proper amount of known synthetic sizing agent.
In step S622, known synthetic sizing agents are hydrolyzed to obtain hydrolysates.
In this step, one or more known synthetic sizing agents may be specifically taken and hydrolyzed separately.
In step S622, a suitable amount of water and an alkaline solution (such as NaOH solution) may be added to the known synthetic sizing agent, and then placed in an oven (the oven temperature may be 90 to 120 degrees celsius) for 3-5 hours to allow for sufficient hydrolysis.
With continued reference to fig. 4, the method further includes a step S623 of observing the synthetic type sizing agent hydrolysate included in the comparison paper dust sample and the known synthetic type sizing agent hydrolysate using a microscope.
In this step, if the comparison is consistent, the process proceeds to step S6231, where it is determined that the synthetic sizing agent hydrolysate included in the paper dust sample is the same material as the known synthetic sizing agent hydrolysate, otherwise, the process proceeds to step S6232, where the synthetic sizing agent hydrolysate included in the comparison paper dust sample and other known synthetic sizing agent hydrolysates are continuously observed with a microscope.
Referring to fig. 5, fig. 5 is a schematic flow chart of another embodiment of the method for determining the type of hydrolysate of synthetic sizing agent according to the present application, wherein the method comprises the following steps.
Step S621, taking a proper amount of known synthetic sizing agent.
In step S622, known synthetic sizing agents are hydrolyzed to obtain hydrolysates.
In this step, one or more known synthetic sizing agents may be specifically taken and hydrolyzed separately.
In step S622, a suitable amount of water and an alkaline solution (such as NaOH solution) may be added to the known synthetic sizing agent, and then placed in an oven (the oven temperature may be 90 to 120 degrees celsius) for 3-5 hours to allow for sufficient hydrolysis.
Unlike the previous examples, the method of this example includes step S624 of comparing the spectra of the synthetic type sizing agent hydrolysate and the known synthetic type sizing agent hydrolysate included in the paper dust sample using an infrared spectrum detector. In this step, if the comparison is consistent, the process proceeds to step S6241, where it is determined that the synthetic sizing agent hydrolysate included in the paper powder sample is the same material as the known synthetic sizing agent hydrolysate, otherwise, the process proceeds to step S6242, where the synthetic sizing agent hydrolysate included in the paper powder sample is compared with other known synthetic sizing agent hydrolysates by using an infrared spectrum detector.
It should be noted that, the step S600 and the substep thereof are used to detect whether the paper powder sample includes the synthetic sizing agent hydrolysate and determine which synthetic sizing agent hydrolysate is specifically included, and may be a separate process flow, and may not adhere to or be received after the step of detecting whether the paper powder sample includes the papermaking fibers and the calcium carbonate.
The paper powder identification method in the embodiment of the application is summarized as follows: the reagent is used for contact reaction with paper powder, and the type of the paper powder is judged according to different reaction results. The reagent comprises two kinds of fiber dyeing agents and dilute hydrochloric acid (0.1% concentration). The specific resolution method is as follows: 1. dyeing the coated paper wool paper powder by using a fiber dyeing agent, determining the paper powder as fiber scraps paper powder if the paper powder turns blue-black, and performing a 2 nd reaction test if no reaction exists; using dilute hydrochloric acid (0.1% concentration) to drop on the surface of the paper powder, and determining the paper powder as calcium carbonate paper powder if the paper powder is dissolved and has bubbles; if neither of the above two agents is reactive, the method of identification in this example may also be used to identify whether the paper powder is a mixture of calcium carbonate, papermaking fibers, a synthetic sizing agent hydrolysate, and specifically a mixture of those two or three.
In addition, the method according to the embodiment of the present application may further determine different forms of the synthetic sizing agent hydrolysate paper powder by combining an optical microscope or an infrared spectrum detector, and generally includes three forms of A, B, C, please refer to fig. 6a to 6c together, fig. 6a is a schematic microscopic enlarged structure of the synthetic sizing agent hydrolysate paper powder, fig. 6b is a schematic microscopic enlarged structure of another synthetic sizing agent hydrolysate paper powder, and fig. 6c is a schematic structural diagram of another synthetic sizing agent hydrolysate paper powder.
Several specific embodiments will be described below.
Embodiment one: the packing position is fed with one part of paper powder sample of the flat paper cutter, and the analysis of the paper powder type is required. 1. Sample state: the adhesive tape is used for sticking paper wool paper powder, and the sample is white flocculent. 2. Photographing under an optical microscope, preserving, and then sucking 2-5 drops of fiber staining solution (particularly Graff 'C' staining solution) to drop on the surface of the paper powder. The paper powder gradually changes from white to blue-black, and when the color is no longer changed, the paper powder is photographed and retained by a microscope. Conclusion: the sample is dyed by the dyeing liquid and turns into blue-black, and the sample is determined to be the fiber-chip paper wool paper powder. In addition, it can be verified by using an optical microscope, and referring to fig. 7, fig. 7 is a schematic view of microstructure of the fiber-chipped paper powder under the microscope.
Embodiment two: the paper Mao Zhifen sample at the rewinder is taken at the production site, and the type of the paper powder is required to be determined. 1. The production site finds that the ground surface has paper wool paper powder falling off when the paper is rewound. Paper dust was found on the surface of the paper by wiping the paper with a black cloth. 2. And sticking the paper powder on the surface of the black cloth by using an adhesive tape, photographing under an optical microscope, keeping, and then sucking 2-5 drops of fiber dyeing liquid (particularly Graff 'C' dyeing liquid) to drop on the surface of the paper powder, wherein the paper powder is not discolored. 3. The surface of the black cloth is photographed and left, then dilute hydrochloric acid (0.1% concentration) is dripped into the powder area by a dropper, and the powder immediately disappears and a small amount of bubbles are generated. Conclusion: dilute hydrochloric acid (0.1% concentration) is used to drop on the surface of the paper powder, and the paper powder is dissolved and has bubbles, which is determined as calcium carbonate paper powder. In addition, the analysis can be verified by using an optical microscope, and referring to fig. 8, fig. 8 is a schematic diagram of the microstructure of the calcium carbonate paper powder under the microscope. Specifically, the form and the composition of the test element can be observed by using an SEM (scanning electron microscope) by using adhesive tape to adhere paper powder. The paper powder is mainly irregular small particles, and the element test result is calcium carbonate.
Embodiment III: the white powder is piled up on the ground of the finishing and packaging workshop, and the type of the paper powder is required to be tested. 1. The white powder is stuck by using an adhesive tape, photographed and stored under an optical microscope, and then 2-5 drops of fiber staining solution (specifically, graff 'C' staining solution, namely, graff 'C' staining solution) are sucked and dropped on the surface of the paper powder. The paper powder is not discolored. 2. The white powder on the tape was photographed, and then diluted hydrochloric acid (0.1% concentration) was dropped on the powder with a dropper, and the powder was not dissolved. 3. The paper powder is white and has obvious electrostatic phenomenon. Dilute acid and fiber dyeing liquid are added to react, and paper powder floats on the surface of the liquid. The paper powder is determined as the hydrolysate of the synthetic sizing agent. 4. And (3) verification: and (3) observing the form of a small amount of paper powder by using SEM, wherein the form of the paper powder is matched with the form of the hydrolysate paper powder of the synthetic sizing agent. Conclusion: does not react with dilute acid and fiber dyeing liquid, and the paper powder has obvious electrostatic property and water repellency. The paper powder is determined as the hydrolysate of the synthetic sizing agent.
Embodiment four: and verifying the morphological components of the synthetic sizing agent hydrolysate paper powder. 1. 3-5g of synthetic sizing agent A, B (10-50 mL of synthetic sizing agent hydrolysate type sizing agent) is added with proper amount of water and NaOH solution, and the mixture is placed in a 105 ℃ oven for 3-5 hours to fully hydrolyze the mixture. In this example, two known synthetic sizing agent hydrolysates (a and B) are taken as examples, and in some other examples, a plurality of the known synthetic sizing agent hydrolysates may be used, and the present application is not limited thereto. 2. A small amount of the synthetic sizing agent hydrolysate A, B was taken and examined for microscopic morphology using SEM. 3. The white powder in example three was taken and the microscopic morphology was observed using SEM. Conclusion: the synthetic sizing agent A was substantially the same as the white powder in example three in appearance morphology and size. In addition, the white powder and synthetic sizing agent hydrolysate A, B of example three can also be tested for infrared spectra. Referring to fig. 9, fig. 9 is a graph of infrared spectra of three materials, namely white powder and synthetic sizing agent hydrolysate A, B in example three. Wherein, the X line in the figure is represented by a spectrum curve of white powder (paper powder) in the third embodiment, the Y line in the figure is represented by a spectrum curve of synthetic sizing agent hydrolysate A in the fourth embodiment, the Z line in the figure is represented by a spectrum curve of synthetic sizing agent hydrolysate B in the fourth embodiment, and from the infrared spectrogram, the spectrum curves of the white powder and the synthetic sizing agent hydrolysate A in the third embodiment are basically consistent, and the white powder in the third embodiment is further verified to be the synthetic sizing agent A.
The paper powder identification method provided by the embodiment of the application can rapidly distinguish the types of the paper powder, is convenient for controlling the production process, improves the production efficiency and ensures the safe production.
The foregoing description is only a partial embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.
Claims (10)
1. A method for identifying paper dust, the method comprising:
taking a proper amount of paper powder sample;
mixing a fiber dyeing liquid with the paper powder sample;
and observing whether the paper powder sample changes color, and if so, judging that the paper powder sample comprises papermaking fibers.
2. The method according to claim 1, wherein the fiber dyeing liquid is Graff "C" dyeing liquid, and wherein in the step of observing whether the paper dust sample changes color, it is observed whether the paper dust sample changes to blue-black.
3. The authentication method according to claim 1, characterized in that the authentication method further comprises the step of: placing the paper powder sample in an acid solution; and observing whether the paper powder sample is at least partially dissolved and bubbles are generated, and if so, judging that the paper powder sample comprises calcium carbonate.
4. The method of claim 3, wherein the acid solution is dilute hydrochloric acid.
5. A method of identification as claimed in claim 3, wherein in the step of placing the paper dust sample in an acid solution, the acid solution is in excess, and further comprising the step of, after the step of placing the paper dust sample in an acid solution: and observing whether a paper powder sample floating on the surface of the acid solution exists or not, and if so, judging that the paper powder sample comprises a synthetic sizing agent hydrolysate.
6. The authentication method according to claim 5, characterized in that the authentication method further comprises the step of: taking a proper amount of known synthetic sizing agent; hydrolyzing the known synthetic sizing agent to obtain a hydrolysate; and observing and comparing the synthetic sizing agent hydrolysate contained in the paper powder sample with the known synthetic sizing agent hydrolysate by using a microscope, and judging that the synthetic sizing agent hydrolysate contained in the paper powder sample and the known synthetic sizing agent hydrolysate are the same material if the comparison is consistent.
7. The method of identification of claim 6, wherein the step of hydrolyzing the synthetic sizing agent to obtain a hydrolysate comprises: a suitable amount of water and alkaline solution are added to the known synthetic sizing agent and then placed in an oven for 3-5 hours to allow for sufficient hydrolysis.
8. The authentication method according to claim 5, characterized in that the authentication method further comprises the step of: taking a proper amount of known synthetic sizing agent; hydrolyzing the known synthetic sizing agent to obtain a hydrolysate; and comparing the spectrums of the synthetic sizing agent hydrolysate and the known synthetic sizing agent hydrolysate contained in the paper powder sample by using an infrared spectrum detector, and judging that the synthetic sizing agent hydrolysate and the known synthetic sizing agent hydrolysate contained in the paper powder sample are the same material if the spectrums are consistent.
9. A method for identifying paper dust, the method comprising:
taking a proper amount of paper powder sample;
placing the paper powder sample in an acid solution;
and observing whether the paper powder sample is at least partially dissolved and bubbles are generated, and if so, judging that the paper powder sample comprises calcium carbonate.
10. A method for identifying paper dust, the method comprising:
taking a proper amount of paper powder sample;
placing the paper dust sample in an excess of an acid solution;
and observing whether a paper powder sample floating in the acid solution exists or not, if so, comparing the synthetic sizing agent hydrolysate contained in the paper powder sample with the known synthetic sizing agent hydrolysate by using an optical instrument, and if the comparison is consistent, judging that the synthetic sizing agent hydrolysate contained in the paper powder sample and the known synthetic sizing agent hydrolysate are the same material.
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| CN202310929955.4A CN116879276A (en) | 2023-07-26 | 2023-07-26 | Paper powder identification method |
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| CN202310929955.4A CN116879276A (en) | 2023-07-26 | 2023-07-26 | Paper powder identification method |
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