CN108497543B

CN108497543B - Method for evaluating retention effect of retention aid on paper-making reconstituted tobacco slurry

Info

Publication number: CN108497543B
Application number: CN201810274857.0A
Authority: CN
Inventors: 李佳睿; 李鲜; 胡劲; 李军; 王玉天; 王开军; 张维钧
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2018-03-30
Filing date: 2018-03-30
Publication date: 2021-05-14
Anticipated expiration: 2038-03-30
Also published as: CN108497543A

Abstract

The invention discloses a method for evaluating retention effect of a retention aid on paper-making reconstituted tobacco slurry, which comprises the following steps: firstly, taking a pulp sample of the reconstituted tobacco by a papermaking method, and adding a retention aid; ② measuring PCD charge amount x of slurry with different addition amount of retention aid_PCDTaking the absolute value to obtain x_∣PCD∣And taking the logarithm ln (x) with e as the base_∣PCD∣) (ii) a Measuring the total retention rate y of the slurry, and linearly fitting the total retention rate y with ln (x)_∣PCD∣) The linear equation y = k × ln (x) is obtained_∣PCD∣) + b, wherein the smaller the slope k value, the better the retention effect of the retention aid. The method is simple and easy to implement, is convenient for evaluating the retention effects of different types of retention aids, and provides certain guidance for the optimal use of the retention aids.

Description

Method for evaluating retention effect of retention aid on paper-making reconstituted tobacco slurry

Technical Field

The invention belongs to the technical field of reconstituted tobacco processes, and relates to a method for evaluating the retention effect of a retention aid on paper-making reconstituted tobacco slurry.

Background

Retention aids are chemical aids added to the top-of-the-wire pulp for improving the retention of the wire section of the paper machine. Retention aids for papermaking are generally water-soluble polymers of high relative molecular mass, which are usually added to the stock before sheet formation to improve retention of fine components in the sheet. The primary function of the retention aid is to enhance the retention of the fine components to ensure that they are effectively retained in the sheet during sheet formation. The paper-making method reconstituted tobacco is a tobacco sheet produced by using tobacco waste materials such as tobacco stems, tobacco powder, tobacco fragments, waste and inferior tobacco leaves and the like as basic raw materials and adopting a paper-making process. In the production process, the retention aid plays an important role in retaining the fine fibers and the fillers due to the characteristics of the tobacco fibers and the small fillers which are easy to run off. Currently, the retention effect of the retention aid is mainly detected by the following methods: colloid charge titration, dynamic water filter, ultraviolet spectrophotometer, and turbid liquid. In the previous research, due to the problem and the defect that the content and the size of the fine components in the pulp cannot be accurately measured, the patent CN103335921A provides a method for detecting the fine components in the filtered filtrate, mainly measures the particle size and the content of the fine components to detect the retention effect of the retention aid in the pulp, but the experimental process is complex.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for evaluating the retention effect of a retention aid on paper-making process reconstituted tobacco slurry, a PCD particle charge meter is adopted to measure the PCD electric charge quantity of the paper-making process reconstituted tobacco slurry, and the total retention rate of the slurry can be simply and directly judged by a logarithm taking method to represent the retention of the retention aid on the paper-making process reconstituted tobacco slurry. The method provides a new method for representing the retention effect of the retention aid used in the reconstituted tobacco pulp at present, and provides a scientific basis for optimizing the use of the retention aid for the reconstituted tobacco pulp and improving the quality of the reconstituted tobacco.

The purpose of the invention is realized by the following technical scheme:

a method for evaluating the retention effect of a retention aid on paper-making reconstituted tobacco pulp comprises the following steps:

(1) taking a pulp sample of the paper-making reconstituted tobacco, and respectively adding retention aid solutions with the mass fractions of 0.25% and 0.125%, 0.250%, 0.375%, 0.500% and 0.625g/L into the six pulp samples;

(2) determination of PCD Charge amount x of slurry Using PCD particle Charge Meter_PCDTaking the absolute value to obtain x_∣PCD∣And taking the logarithm ln (x) with e as the base_∣PCD∣)；

(3) The total retention of the slurry, y, was determined and a linear fit was made between the total retention y and ln (x)_∣PCD∣) To obtain the linear equation y ═ k × ln (x)_∣PCD∣) + b, b is a constant, the smaller the value of the slope k, the better the retention effect of the retention aid.

Compared with the prior art, the invention has the following advantages:

1. the retention effects of different retention aids are evaluated by detecting the electrochemical characteristics and total retention of the slurry;

2. the method is simple to operate and convenient to calculate, and the difference of the retention effects of the same retention aid when different concentrations are added can also be judged;

3. provides a method for representing retention characteristics of a novel retention aid for paper-making reconstituted tobacco slurry.

Drawings

FIG. 1 shows the total retention of chitosan in different amounts and ln (x)_∣PCD∣) A linear relationship graph of (a);

FIG. 2 shows the total retention of guar gum at different addition levels versus ln (x)_∣PCD∣) Is shown in linear relationship.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Example 1

(1) Taking the reconstituted tobacco pulp of a certain workshop headbox papermaking method, and adding 0.25% of chitosan solution into six parts of pulp according to the mass fraction of 0, 0.125g/L, 0.250g/L, 0.375g/L, 0.500g/L and 0.625 g/L;

(2) measuring the PCD charge amount of slurry PCD with different adding amounts of chitosan by using a PCD particle charge meter, and taking the absolute value x of the measured PCD charge amount_∣PCD∣；

(3) Taking the logarithm with e as the base to obtain ln (x)_∣PCD∣) As in Table 1;

TABLE 1 calculation of ln (x) for different chitosan solution addition levels_∣PCD∣) Value of (A)

(4) The total retention rate of the sizing agent with different adding amounts of the chitosan is measured by using a dynamic drainage instrument, and the total retention rate is compared with ln (x)_∣PCD∣) Linear fitting was performed, as shown in fig. 1, with the equation of linear fit being-7.4739 x +106.57 for y and-7.4739 for k, with better degree of linear fit R²0.9326, the retention aid has better retention effect.

Example 2

(1) Taking the reconstituted tobacco pulp of a certain workshop headbox papermaking method, and adding guar gum solution with the mass fraction of 0.25% into the pulp according to the mass fraction of 0, 0.125g/L, 0.250g/L, 0.375g/L, 0.500g/L and 0.625 g/L;

(2) measuring the PCD charge amount of slurry PCD of different addition amounts of guar gum by using a PCD particle charge meter, and taking an absolute value of the measured PCD charge amount;

(3) taking the logarithm with e as the base to obtain ln (x)_∣PCD∣) As in Table 2;

table 2 calculation of ln (x) for different amounts of guar gum added_∣PCD∣) Value of (A)

(4) The total retention of guar gum at different addition levels was determined using a dynamic drainage meter for the total retention with ln (x)_∣PCD∣) Linear fitting was performed, as shown in fig. 2, with the equation of linear fit being-3.9626 x +89.267 for y and-3.9626 for k, with better degree of linear fit R²0.9787, retention aid is less effective than chitosan.

Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that the above embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or any other related technical fields, which are directly or indirectly applied thereto, are included in the scope of the present invention.

Claims

1. A method for evaluating the retention effect of a retention aid on paper-making reconstituted tobacco pulp comprises the following steps:

(2) determination of PCD Charge amount x of slurry_PCDTaking out the absolutePair worth x_∣PCD∣And taking the logarithm ln (x) with e as the base_∣PCD∣)；

(3) The total retention of the slurry, y, was determined and a linear fit was made between the total retention y and ln (x)_∣PCD∣) To obtain the linear equation y ═ k × ln (x)_∣PCD∣) + b, b is a constant, the smaller the slope k value, the better the retention effect of the retention aid.

2. The method of claim 1, wherein the PCD charge level of the slurry is determined in step (2) using a PCD particle charge meter.

3. The method of claim 1, wherein the total slurry retention is determined in step (3) using a dynamic drainage meter.