阅读说明：本技术 一种评估低氯湿强剂在生活纸中应用效果的纸样制作方法 (Paper pattern making method for evaluating application effect of low-chlorine wet strength agent in household paper ) 是由 施晓旦 王丽敏 杨迪 于 2020-12-10 设计创作，主要内容包括：本发明公开了一种评估低氯湿强剂在生活纸中应用效果的纸样制作方法,包括如下步骤：按照纸张定量10-15g/m～2复配浆料,添加低氯湿强剂,混合均匀后在纸页成形器上抄片成形,用纯棉布覆盖纸页并用中速滤纸吸水并伏压一定时间；纸页在纯棉布的吸附作用下从纸页成形器上转移下来,然后经干燥、熟化、平衡后得到纸样,本发明通过实验室低克重抄纸,可有效评估低氯湿强剂应用于生活纸中的增强效果,提高低定量纸样抄成率及纸样匀度,进而提高实验准确度,同时提高低氯湿强剂在生活纸工艺时实验室小试应用和上机使用的一致性。(The invention discloses a paper pattern making method for evaluating the application effect of a low-chlorine wet strength agent in household paper, which comprises the following steps: according to the basis weight of paper, 10-15g/m 2 Compounding the slurry, adding a low-chlorine wet strength agent, uniformly mixing, making sheets on a paper former for forming, covering paper with pure cotton cloth, absorbing water with medium-speed filter paper and pressing for a certain time; the paper sheet is transferred from the paper sheet forming device under the adsorption action of the pure cotton cloth, and then the paper sheet is dried, cured and balanced to obtain the paper sample.)

1. A paper pattern making method for evaluating the application effect of a low-chlorine wet strength agent in household paper is characterized by comprising the following steps:

s1, 10-15g/m according to basis weight²Compounding the slurry;

s2, adding a low-chlorine wet strength agent into the slurry, and uniformly mixing;

s3, sheet forming on a paper former;

s4, covering the paper sheet formed by the sheet making with pure cotton cloth, covering the cotton cloth with medium-speed filter paper, and pressing with a sheet making device;

s5, transferring the paper sheet formed by sheet making from a paper sheet former under the adsorption action of pure cotton cloth, and then drying on a paper sheet quick dryer;

s6, removing the pure cotton cloth after drying, and moving the paper into an oven for curing;

and S7, after curing, balancing for 4 hours under the conditions of constant temperature and constant humidity to obtain the paper sample.

2. The method of claim 1, wherein the amount of the low chlorine wet strength agent added in step S2 is 5 to 20 kg/ton of paper.

3. The method of claim 1, wherein the pure cotton gauge is 30 counts 78 x 65.

4. The method of claim 1, wherein in step S4, the pressure is 40-100KPa and the time is 3-10 seconds.

5. The method as claimed in claim 1, wherein in step S4, the medium-speed filter paper has a thickness of 0.5-1mm and a quantitative value of 260-450g/m²。

6. The method as claimed in claim 1, wherein the drying temperature is 106 ℃ and 110 ℃ and the drying time is 5-10 minutes in step S5.

7. The method of claim 1, wherein the aging temperature of step S6 is 105 ± 2 ℃ and the aging time is 10-30 minutes.

8. The method of claim 1, wherein the constant temperature and humidity conditions of step S7 are that the temperature is constant at 23 ± 1 ℃ and the humidity is constant at 50 ± 2%.

Technical Field

The invention relates to the technical field of papermaking detection, in particular to a paper pattern making method for evaluating the application effect of a low-chlorine wet strength agent in household paper in a laboratory.

Background

The development of low quantification of paper and paperboard makes the application of polyamide polyamine epichlorohydrin (PAE) wet strength agent in the papermaking industry very common, especially in the living paper with certain requirement on wet strength, the application of wet strength agent is indispensable, because the requirements of the living paper with different purposes on the wet strength are different, based on the consideration of service performance and market competitiveness, the application screening of the wet strength agent in the industry is more and more strict, meanwhile, the evaluation method of the application effect of the wet strength agent in the living paper in the laboratory is required to be more and more accurate, and the refining method of the paper making method of low gram weight paper sample in the laboratory is also required to be refined.

At present, a paper making method for a low-gram-weight paper sample in a laboratory has two problems, namely low strength of the paper sample due to too low paper forming quantity, difficult transfer of wet paper from a forming net after pulp sheet making and difficult peeling of paper forming and absorbent paper after drying, low paper sample making rate and poor paper sample uniformity. So the experimental data has larger error.

Therefore, the research and development of a new method for evaluating the application effect of the low-chlorine wet strength agent in the living paper in a laboratory has important practical significance.

Disclosure of Invention

The invention aims to provide a method for evaluating the application effect of a low-chlorine wet strength agent in household paper in a laboratory, so as to solve the defects in the background art.

The invention is realized by the following technical scheme:

a paper pattern making method for evaluating the application effect of a low-chlorine wet strength agent in household paper comprises the following steps:

s1, 10-15g/m according to basis weight²Compounding the slurry;

s2, adding a low-chlorine wet strength agent into the slurry, and uniformly mixing;

s3, sheet forming on a paper former;

s4, covering the paper sheet formed by sheet making with pure cotton cloth, absorbing water with medium-speed filter paper and pressing with a sheet making device;

s5, transferring the paper sheet formed by sheet making from a paper sheet former under the adsorption action of pure cotton cloth, and then drying on a paper sheet quick dryer;

s6, removing the pure cotton cloth after drying, and moving the paper into an oven for curing;

and S7, after curing, balancing for 4 hours under the conditions of constant temperature and constant humidity to obtain the paper sample.

The pulp is paper pulp, and the composition of the pulp varies according to different paper types of the household paper, for example, the composition of the food packaging paper is long fiber: short fibers are 50:50, and the composition of the soft tissue paper is long fibers: short fiber 80: 20.

in step S2, the addition amount of the low-chlorine wet strength agent is 5-20 kg/ton paper (wet/dry).

The specification of the pure cotton cloth is 30 pieces 78 x 65. 30 counts means that 1 two cottons can be made into 30 yarns with the length of 1 meter, and 78 x 65 means that the warp and weft density in 1 square centimeter is 143(78+ 65).

In step S4, the thickness of the medium-speed filter paper is 0.5-1mm, and the quantitative ratio is 260-450g/m²(ii) a The pressure of the voltage is 40-100KPa, and the voltage time is 3-10 seconds.

In step S5, the drying temperature is 106-110 ℃, and the drying time is 5-10 minutes.

The curing temperature of the step S6 is 105 +/-2 ℃, and the curing time is 10-30 minutes.

The constant temperature and humidity condition of step S7 means that the humidity is constant at 50 + -2% at 23 + -1 deg.C.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the enhancement effect of the low-chlorine wet strength agent applied to the household paper can be effectively evaluated through the low-gram-weight papermaking in a laboratory;

2. the method is simple to operate, and can be widely applied to the evaluation of the wet strength agent applied to the tissue paper process in the papermaking laboratory;

3. the invention improves the low-quantitative paper pattern forming rate and the paper pattern evenness, further improves the experimental accuracy, and simultaneously improves the consistency of laboratory lab application and on-machine use of the low-chlorine wet strength agent in the household paper process.

Detailed Description

The invention is illustrated below by means of specific examples, without being restricted thereto. All the raw materials are conventional commercial products unless otherwise specified. Specific groups of slurries for the examples and comparative examplesThe method comprises the following steps: long fibers: short fiber 80:20, wet strength agent 20kg/t paper, papermaking quantitative 14.2g/m²。

Examples 1 to 5

The experimental process comprises the following steps: weighing quantitative slurry, adding wet strength agent, stirring, dividing into 5 parts, covering with pure cotton cloth with thickness of 0.5-1mm and quantitative amount of 260 g/m after sheet making with LABTECH73-62 semiautomatic paper former, respectively²The medium-speed filter paper absorbs water and is pressed for 3 seconds with the pressing strength of 40KPa by pressing a pressing key of a sheet making device, and the medium-speed filter paper is transferred to a paper sheet quick dryer together with pure cotton cloth from a forming net for drying, the drying temperature is 110 ℃, and the drying time is 5 minutes; then curing the mixture in an oven at 105 ℃ for 15 minutes, and balancing the mixture for 4 hours under the conditions of constant temperature and constant humidity to obtain a paper sample. After the sequential operations, 5 samples, namely examples 1 to 5, are obtained, and the tensile strength of the paper is measured according to the national standard GB/T31110-2014.

Comparative examples 1 to 5

The paper sheet is directly transferred without using pure cotton cloth for water absorption in the process of making the paper, and other processes are the same as the examples 1-5. The specific experimental process is as follows: weighing quantitative slurry, adding a wet strength agent sample, uniformly stirring, evenly dividing into 5 parts, respectively making sheets by using a LABTECH73-62 semi-automatic sheet former, and drying the sheets transferred from a forming net on a sheet quick dryer at the drying temperature of 110 ℃ for 5 minutes; then curing the mixture in an oven at 105 ℃ for 15 minutes, and balancing the mixture for 4 hours under the conditions of constant temperature and constant humidity to obtain a paper sample. After the operations are carried out in sequence, 5 parts of paper samples are obtained, namely comparative examples 1 to 5, and the tensile strength of the paper is detected according to the national standard GB/T31110-2014.

Comparative examples 6 to 10

The experimental procedure was as follows: weighing quantitative slurry, adding a wet strength agent sample, uniformly stirring, evenly dividing into 5 parts, respectively making sheets in a LABTECH73-62 semi-automatic sheet former, covering the sheets transferred from a forming net with pure cotton cloth, absorbing water with medium-speed filter paper, and then drying on a sheet quick dryer at the drying temperature of 110 ℃ for 5 minutes; then curing the mixture in an oven at 105 ℃ for 15 minutes, and balancing the mixture for 4 hours under the conditions of constant temperature and constant humidity to obtain a paper sample. After the operations are carried out in sequence, 5 parts of paper samples are obtained, namely comparative examples 6 to 10, and the tensile strength of the paper is detected according to the national standard GB/T31110-2014.

Comparative example 11

The composition of the pulp and the amount of the wet strength agent are the same as those in example 1, the papermaking process adopts a conventional paper machine for production, and the width is as follows: 5560mm, vehicle speed: 1690m/min, paper seed: 14.2g/m²Soft tissue, yield: 6-7 t/h. After the paper is formed, a paper sample is taken to detect the performance of the paper according to the same method.

Specific experimental data for each example and comparative example are shown in table 1:

TABLE 1 sample Performance index

The mean, standard deviation and coefficient of variation of the tensile strengths of examples 1-5 and comparative examples 1-5, and comparative examples 6-10 were further calculated as shown in table 2:

wherein the coefficient of variation is 100% standard deviation/mean. The coefficient of variation may reflect the degree of dispersion of the data. As can be seen from the experimental results of examples 1-5 and comparative example 11, the consistency of laboratory bench test data and actual production data can be improved through laboratory low-basis-weight papermaking, so that the accuracy of the wet strength agent application experiment is improved. The dispersion of the tensile strength test data of the examples 1-5 and the comparative examples 1-5 shows that the uniformity of the low-basis weight paper can be improved by transferring the paper sheet by the pure cotton cloth, so that the accuracy of the paper sample detection data is improved, and the accuracy of the test is improved. The dispersion of the experimental data of the tensile strengths of examples 1-5 and comparative examples 6-10 shows that the paper sheet directly transferred from the forming wire and covered with the pure cotton cloth to absorb water is smaller than the dispersion of the water-absorbing property, but is still not the same as the method of the present invention, and further proves that the method of the present invention is used for evaluating the application effect of the wet strength agent in the low-basis weight paper variety, the experimental result is visual and accurate, the operation is simple, and the method can be widely used for evaluating the low-basis weight paper performance in a laboratory.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.