Method for detecting content of stickies in white water system of paper mill

Abstract

The invention relates to the technical field of papermaking process detection, in particular to a method for detecting the content of stickies in a white water system of a paper mill. According to the invention, the content of the stickies is determined by measuring the weight change of the stainless steel plate before and after measurement, the operation process only needs to involve the steps of weighing, baking and stirring, multiple samples can be tested within one and a half hours, and the method has the advantage of rapid test. Besides, the testing process is not interfered by non-adhesive components in white water, as long as the operation is correct, the accuracy and reliability of the measurement result are relatively high, and the reliability of the result can be further improved by measuring the sample for multiple times and averaging.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking process detection, and more specifically, to a method for detecting the content of stickies in a white water system of a paper mill. Background Art

[0002] The paper machine production system that uses recycled fiber as the main raw material will be affected by the synthetic resin and natural resin brought in by the waste paper, and the adsorption of some colloid particles will cause the colloid volume to increase continuously, which will affect the visual effect of the paper surface. Most organic matter will have a certain degree of adhesion. In the paper machine white water system, it will continue to collide and accumulate, and there will be a risk of increasing in volume and depositing on the surface of the equipment and then falling off. For this reason, it is particularly important to evaluate the content of organic viscous substances in the paper machine white water system and control it.

[0003] The current methods for testing stickies mainly include organic solvent extraction method and turbidity method. The organic solvent extraction method uses organic solvent to extract stickies and then weighs and measures them. It usually takes about 6 hours to test a sample and is not suitable for rapid measurement of stickies during paper machine production. The turbidity method indirectly reflects the content of stickies in the sample by measuring the turbidity of the sample. The turbidity obtained by this method is the result of the combined action of filler particles, fine fibers and adhesive substances. It cannot accurately reflect the content of stickies in the system, and it is also impossible to accurately evaluate the negative impact of stickies on paper machine operation. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a method for detecting the stickies content in the white water system of a paper mill, which method can quickly and accurately evaluate the stickies content in the white water system of a paper mill.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for detecting the stickies content in a white water system of a paper mill comprises the following steps:

[0007] S1: Place the marked stainless steel insert in an oven to dry, weigh the stainless steel insert using a four-digit balance, and record the absolute dry weight W1 of the stainless steel insert;

[0008] S2: Insert the marked stainless steel insert into the fixed plate, then place it in the beaker, add white water from the papermaking flow system into the beaker, and stir continuously;

[0009] S3: After stirring for 100-120 minutes, take out the stainless steel insert, rinse it in clean water, and then place it in an oven to dry. The dried stainless steel insert is weighed W2, and the difference between W2 and W1 is calculated. The larger the difference, the higher the adhesive content.

[0010] Generally speaking, the surface roughness of the adhered material is the source of mechanical adhesion. Increasing the roughness is equivalent to increasing the surface area, and the bonding strength of the rough surface is higher than that of the smooth surface. Appropriate roughness can make the bonding reach a maximum strength. Appropriate surface roughness is beneficial to improving the bonding strength, but excessive roughness is not conducive to bonding. If the roughness is too large, the interface contact is poor, and the adhesive is not easy to infiltrate and penetrate. If the surface roughness is too low, the contact area is reduced. In addition, different adhered materials have different surface polarities and different bonding conditions with adhesives. Generally speaking, the bonding strength of metal surfaces is better than that of non-metallic materials. The general rule is: steel>aluminum alloy>iron>aluminum profiles>copper>gold>polyethylene or polypropylene. Therefore, the present invention selects 304 stainless steel inserts as the adhered material.

[0011] Preferably, in step S1, the marked stainless steel insert is placed in an oven at 105° C. and dried for 60 minutes.

[0012] Preferably, in step S2, the measuring range of the beaker is 3L, and the volume of the white water taken from the papermaking flow system is 2L.

[0013] Preferably, in step S3, the stainless steel insert after being rinsed in clean water is placed in an oven at 105° C. and dried for 60 minutes.

[0014] Preferably, in step S3, the stainless steel insert is scrubbed in standing clean water.

[0015] Preferably, in step S2, continuous stirring is performed at a rotation speed of 500 r / min.

[0016] Preferably, the fixing plate in step S2 is a stainless steel ring having eight slots.

[0017] The present application has the following beneficial effects: the present invention determines the content of adhesives by measuring the weight change of the stainless steel plate before and after, and the operation process only involves weighing, baking, and stirring steps, and can complete multiple sample tests within one and a half hours, which has the advantage of rapid testing. In addition, the test process is not interfered by non-adhesive components in white water. As long as the operation is correct, the accuracy and reliability of the measurement results are relatively large. By taking an average value of multiple measurements of the sample, the reliability of the results can be further improved. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with embodiments, but the scope of protection claimed by the present invention is not limited to the scope described in the embodiments.

[0019] Example 1

[0020] A method for detecting the content of stickies in a white water system of a paper mill comprises the following steps:

[0021] S1: Place the marked stainless steel insert (50mm*150mm) in a 105℃ oven and dry for 60 minutes. Use a four-digit balance to weigh the stainless steel insert and record the absolute dry weight W1 of the stainless steel insert.

[0022] S2: Eight marked stainless steel inserts are inserted into a fixed plate made of a stainless steel ring, and then placed in a 3L beaker. 2L of white water from the papermaking flow system is added to the beaker and stirred continuously at 500r / min.

[0023] S3: After stirring for 120 minutes, take out the stainless steel insert, rinse it in standing clean water (do not destroy the material adhering to the stainless steel surface), and then place it in a 105°C oven to dry for 60 minutes. Weigh W2 after drying the stainless steel insert, and calculate the difference between W2 and W1. The larger the difference, the higher the adhesive content.

[0024] The test results are as follows:

[0025] Table 1 Results of sticky matter content in white water in Example 1

[0026]

[0027]

[0028] The sticky matter content in the above table = (W2-W1) / 2000*100%.

[0029] Comparative Example 1

[0030] A method for detecting the stickies content in a white water system of a paper mill comprises the following steps:

[0031] S1: Place the marked aluminum insert in a 105°C oven and dry for 60 minutes, weigh the aluminum insert using a four-digit balance, and record the absolute dry weight W1 of the aluminum insert;

[0032] S2: Eight marked aluminum inserts are inserted into a fixed plate made of a stainless steel ring, and then placed in a 3L beaker. 2L of white water from the papermaking flow system is added to the beaker and stirred continuously at 500r / min.

[0033] S3: After stirring for 120 minutes, take out the aluminum insert, rinse it in standing clean water (do not destroy the material adhering to the aluminum surface), and then place it in a 105°C oven to dry for 60 minutes. Weigh the dried aluminum insert W2, and calculate the difference between W2 and W1. The larger the difference, the higher the adhesive content.

[0034] The test results are as follows:

[0035] Table 2 Results of sticky matter content in white water in comparative example 1

[0036] Group <![CDATA[W1(g)]]> <![CDATA[W2(g)]]> Difference(g) Adhesive content (%) Aluminum insert 1 2.8796 2.8918 0.0122 0.00061％ Aluminum insert 2 3.1043 3.1172 0.0129 0.00065％ Aluminum insert 3 3.4101 3.4218 0.0117 0.00059％ Aluminum insert 4 2.8745 2.8864 0.0119 0.00060％ Aluminum insert 5 3.2524 3.2645 0.0121 0.00060％ Aluminum insert 6 3.5948 3.6062 0.0114 0.00057％ Aluminum insert 7 3.0212 3.0327 0.0115 0.00058％ Aluminum insert 8 3.4435 3.4561 0.0126 0.00063％ average value 3.1976 3.2095 0.0120 0.00060％

[0037] Comparative Example 2

[0038] A method for detecting the stickies content in a white water system of a paper mill comprises the following steps:

[0039] S1: Place the marked iron insert in a 105°C oven and dry for 60 minutes, weigh the iron insert using a four-digit balance, and record the absolute dry weight W1 of the iron insert;

[0040] S2: Insert eight marked iron inserts on a fixed plate made of a stainless steel ring, then place it in a 3L beaker, add 2L of white water from the papermaking flow system into the beaker, and stir continuously at 500r / min;

[0041] S3: After stirring for 120 minutes, take out the iron insert, rinse it in standing clean water (do not destroy the material adhering to the iron surface), and then place it in a 105°C oven for drying for 60 minutes. Weigh W2 after drying the iron insert, and calculate the difference between W2 and W1. The larger the difference, the higher the adhesive content.

[0042] The test results are as follows:

[0043] Table 3 Results of sticky matter content in white water in comparative example 2

[0044] Group <![CDATA[W1(g)]]> <![CDATA[W2(g)]]> Difference(g) Adhesive content (%) Iron insert 1 9.2568 9.2696 0.0128 0.00064％ Iron insert 2 9.3659 9.3789 0.0130 0.00065％ Iron insert 3 8.4514 8.4629 0.0115 0.00057％ Iron insert 4 9.0658 9.0781 0.0123 0.00061％ Iron insert 5 10.2565 10.2676 0.0111 0.00055％ Iron insert 6 8.9926 9.0055 0.0129 0.00065％ Iron insert 7 9.2634 9.2753 0.0119 0.00059％ Iron insert 8 9.8715 9.8837 0.0122 0.00061％ average value 9.3155 9.3277 0.0122 0.00061％

[0045] Comparative Example 3

[0046] A method for detecting the stickies content in a white water system of a paper mill comprises the following steps:

[0047] S1: Place the marked polypropylene insert in a 105°C oven and dry for 60 minutes, weigh the polypropylene insert using a four-digit balance, and record the absolute dry weight W1 of the polypropylene insert;

[0048] S2: Eight marked polypropylene inserts are inserted into a fixed plate made of a stainless steel ring, and then placed in a 3L beaker. 2L of white water from the papermaking flow system is added to the beaker and stirred continuously at 500r / min.

[0049] S3: After stirring for 120 minutes, take out the polypropylene insert, rinse it in standing clean water (do not destroy the substances adhering to the surface of the polypropylene), and then place it in a 105°C oven to dry for 60 minutes. Weigh W2 for the dried polypropylene insert, and calculate the difference between W2 and W1. The larger the difference, the higher the adhesive content.

[0050] The test results are as follows:

[0051] Table 4 Results of sticky matter content in white water in comparative example 3

[0052] Group <![CDATA[W1(g)]]> <![CDATA[W2(g)]]> Difference(g) Adhesive content (%) PP insert 1 1.1642 1.1761 0.0119 0.00060％ PP insert 2 1.0765 1.0887 0.0122 0.00061％ PP insert 3 0.9758 0.9882 0.0124 0.00062％ PP insert 4 1.0042 1.0161 0.0119 0.00060％ PP insert 5 1.1568 1.1683 0.0115 0.00057％ PP insert 6 1.0335 1.0453 0.0118 0.00059％ PP insert 7 1.0642 1.0794 0.0152 0.00076％ PP insert 8 1.1347 1.1467 0.012 0.00060％ average value 1.0762 1.0886 0.0124 0.00062％

[0053] Comparative Example 4

[0054] A method for detecting the content of stickies in a white water system of a paper mill comprises the following steps:

[0055] S1: Place the marked organic glass insert in a 105°C oven and dry for 60 minutes, weigh the organic glass insert using a four-digit balance, and record the absolute dry weight W1 of the organic glass insert;

[0056] S2: Eight marked plexiglass inserts are inserted into a fixed plate made of a stainless steel ring, and then placed in a 3L beaker. 2L of white water from the papermaking flow system is added to the beaker and stirred continuously at 500r / min.

[0057] S3: After stirring for 120 minutes, take out the plexiglass insert, rinse it in standing clean water (do not destroy the substances adhering to the surface of the plexiglass), and then place it in a 105°C oven to dry for 60 minutes. Weigh the dried plexiglass insert as W2, and calculate the difference between W2 and W1. The larger the difference, the higher the adhesive content.

[0058] The test results are as follows:

[0059] Table 5 Results of sticky matter content in white water in comparative example 4

[0060] Group <![CDATA[W1(g)]]> <![CDATA[W2(g)]]> Difference(g) Adhesive content (%) PMMA insert 1 1.2712 1.2835 0.0123 0.00061％ PMMA insert 2 1.3714 1.3831 0.0117 0.00059％ PMMA insert 3 1.5043 1.5184 0.0141 0.00071％ PMMA insert 4 1.2669 1.2818 0.0149 0.00075％ PMMA insert 5 1.4346 1.446 0.0114 0.00057％ PMMA insert 6 1.5886 1.6001 0.0115 0.00058％ PMMA insert 7 1.3333 1.3486 0.0153 0.00077％ PMMA insert 8 1.5201 1.5324 0.0123 0.00061％ average value 1.4113 1.4242 0.0129 0.00065％

[0061] The batches of white water taken in Comparative Examples 1-4 are the same as the batches of white water taken in Example 1.

[0062] As can be seen from Tables 1-5, the present invention determines the content of adhesives by measuring the weight change before and after the insert. The operation process only involves weighing, baking, and stirring steps, and multiple sample tests can be completed within one and a half hours, which has the advantage of rapid testing. In addition, the test process is not interfered by non-adhesive components in white water. As long as the operation is correct, the accuracy and reliability of the measurement results are relatively large (among which the stainless steel insert is the best embodiment). By taking the average value of multiple measurements of the sample, the reliability of the results can be further improved.

[0063] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for detecting the stickies content in the white water system of a paper mill, It is characterized in that The following steps are involved: S1: Place the marked stainless steel insert in an oven to dry, weigh the stainless steel insert using a four-digit balance, and record the absolute dry weight W of the stainless steel insert. 1 ; S2: Insert the marked stainless steel insert into the fixed plate, then place it in the beaker, add white water from the papermaking flow system into the beaker, and stir continuously; S3: After stirring for 100-120 minutes, take out the stainless steel insert, rinse it in clean water, and then place it in an oven to dry. The dried stainless steel insert is weighed W 2 , calculate W 2 With W 1 The greater the difference, the higher the stickies content.

2. The method for detecting the stickies content in the white water system of a paper mill according to claim 1, It is characterized in that In step S1, the marked stainless steel insert is placed in an oven at 105° C. and dried for 60 minutes.

3. The method for detecting the stickies content in the white water system of a paper mill according to claim 1, It is characterized in that In step S2, the measuring range of the beaker is 3L, and the volume of the white water taken from the papermaking flow system is 2L.

4. The method for detecting the stickies content in the white water system of a paper mill according to claim 1, It is characterized in that In step S3, the stainless steel insert after being rinsed in clean water is placed in an oven at 105° C. and dried for 60 minutes.

5. The method for detecting the stickies content in the white water system of a paper mill according to claim 1, It is characterized in that In step S3, the stainless steel insert is scrubbed in stationary clean water.

6. The method for detecting the stickies content in the white water system of a paper mill according to claim 1, It is characterized in that In step S2, stirring is continued at a rotation speed of 500 r / min.

7. The method for detecting the stickies content in the white water system of a paper mill according to claim 1, It is characterized in that The fixing plate in step S2 is a stainless steel ring, and the stainless steel ring is provided with eight slots.

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