SU1359739A1 - Method of estimating paper-forming properties of cellulose material - Google Patents

Abstract

The invention relates to a method for evaluating the paper-forming properties of cellulosic material and is intended for use in the pulp and paper industry. The aim of the invention is to increase accuracy while reducing the evaluation time. To do this, measure the intensity of diffraction 1A.1x reflections I, (j, and ICDI of cellulosic material. Determine the strength of interfibrillary bonds by the ratio of diffraction reflections, and then evaluate the properties of the material where hydrogen bonds; 1 oh the intensity of the reflection from the planes 200, 201, 102 and is constant.

Description

The invention relates to a method for determining the paper-forming properties of cellulosic material and is intended for use in the pulp and paper industry.

The aim of the invention is to improve the accuracy while reducing the evaluation time

Figure 1 shows a scheme for determining the relative intensity of diffraction reflexes 101 to 002 for cellulose, materials according to the X-ray diffractometer; FIG. 2 shows the change in the paper-forming properties: (I is the relative intensity of the diffraction reflex; 2 is the fracture, the number of double kinks; 3 is the breaking length, m; 4 is the resistance to pushing. KPA) of the unbleached pulp during repeated processing pr grinding up to 30 UIP at each processing cycle.

The sequence of operations of the method.

The relative intensity of the 1.0, / IOQ reflexes is determined as follows.

On an X-ray diffractometer, a paper sample is taken by scanning the diffracted radiation counter in the angle range (20) 8 ° -32 °. In the course of continuous shooting, the intensity of the diffracted radiation is converted into an electrical signal, processed on an electronic counting device and displayed on the potentiometer recorder in the form of a curve of the intensity distribution of the diffraction angle 20 (4F1),

On the diffraction curve, the intensity of the reflections 101 and 002, expressed as 8 mm, is determined with a ruler. Then their attitude is taken. The obtained values of the ratio 1, o, / 1o (, g depending on the processing cycles as an example are shown in figs, 1 and 2 o

Industrial types of paper consist of a modification of cellulose 1 and the proposed method for determining the relative intensity of reflexes relates to cellulose 1 about

Since the diffraction reflex 101 for ceutlu oza of modification 1 characterizes intermolecular hydrogen bonds, a decrease in its intensity indicates a decrease in the number of these bonds,

The intensity of the 002 reflex is chosen as an internal standard, since the interference from the 200, 201, 102, and 201 planes falls within the diffraction reflex 002.

102, and the total intensity remains almost unchanged.

PRI me R „Practically, to evaluate the paper-forming properties of cellulosic materials using

the proposed method, giving infor-. a relative unit, it is enough to have a comparative set of such values for different materials created on the basis of various celluloses (coniferous, larch, cotton, and t, do) depending on the method of their production (sulphite, sulphate cooking, thermomechanical masses, and so on, ),

The DDP of this initial strength properties of the cellulosic material is assessed using traditional methods, such as the method for determining tensile strength and elongation at

stretching 5 method for determining fracture strength with multiple bends, method for determining resistance to bursting,

On g, 2 presents the change

the paper-forming properties of unbleached sulphate pulp in the process of multiple processing with grinding up to 30 SR per each processing cycle. These results were obtained during the recycling and use of waste paper.

There is an obvious correlation relationship between the results,

We propose using the method obtained and traditional methods for determining the strength properties of cellulosic material (Fig2).

Especially helpful and informative.

The proposed method for evaluating changes in the strength properties of cellulosic material under various modes of processing cellulosic fibers (dissolution, grinding, cavitation, etc.),

Compared with the above-mentioned applied methods, the proposed method has several advantages allowing to increase the accuracy of the obtained results and significantly

reduce the time spent on assessing the strength properties of cellulosic materials. Thus, in traditional methods, to obtain reliable results, it is necessary to measure 20 samples (Yu in the machine direction and 10 perpendicular to the machine direction) and

influence the orientation of the specimen, having with in the paper at low tide. Thus, only the fiber structure is examined.

The time spent on all the necessary operations for sample preparation, taking a sample on a diffractometer and processing the result is not the average result. Therefore, on. the process depends on the studied cel- lous conduct of labor-intensive operations, the connection of the material (various types of paper, with sample preparation and measurement and processing of results, takes a lot of time. This time depends on the materials studied and lies within

Claims (1)

cardboard and others,) and not gfenyshast 30 microns, the invention Formula A method for evaluating the paper-forming properties of cellulosic material by measuring parameters and determining its properties, i and c 1 - 8 h and more In the anticipated method for research it is necessary to have only 1 material sample. In the process of research, 20 t that, in order to increase, a very fine sample, which is a circle with a radius of R 9 mm, rotates in its plane with an angular rotation speed of 60 rpm. Since the sample area is 254 mm, and -002 cellulose, defined 25 KIT according to the corresponding dkfr.: Kionnye reflexes of the primitive and fiber communication and oueHHB; i; oT with the property of the material, where I (Q, - vim, ég.pv11o; -t reflect from kristaplogrg | fiches: - to the plane 10 X-ray beam area of about 36 mm, then when the sample is rotated during the survey, more than 7 times the sample area is examined compared to the area of the first, 30 main beam of which is located, which is similar to semi-intermolecular hydrogen bonds; averaged result at ioog the intensity of reflection from taking 7 samples. In addition, the planes 200, 201, and 102 are In the sample pattern, the effect is removed. at 13597394 influence the orientation of the specimen, having with in the paper at low tide. Thus, only the fiber structure is examined. The time spent on all the necessary operations to prepare the sample, take a sample on the diffractometer and process the result does not depend on the cell material under study (various types of papers, cardboard and others,) and not gfenyshast 30 microns, the invention Formula The tomometer and the processing of the result does not depend on the cell material under study (various types of paper, A method for evaluating the paper-forming properties of cellulosic material by measuring parameters and determining its properties, i and c at the same time, g shortens the time of the buds, from epi: rt intensity diffraction; chonsh, 1x reflexes I 01 -002 cellulose, defined - KIT according to the corresponding dkfr.: Kionnye reflexes of the human body and fiber communication and oueHHB; i; oT with the property of the material, inside of which are located the main intermolecular hydrogen bonds; where I (Q, - vim, ég.pv11o; -t reflect from kristaplogrg | fiches: - to the plane 101, inside of which are located the main intermolecular hydrogen bonds; 0i J002 eight 12 sixteen go / cffue.} 2c B2 /: 5 4 . Ijuffffw Editor T. Parfenova Compiled by L. Prokhorov Tehred L. Serdyukova Order 6151/48 Circulation 776 Subscription VNIIPI USSR State Committee, for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader O. Kravtsov