SU120337A1 - Method for assessing the quality of hemp trusts - Google Patents

Description

In the known methods of assessing the quality of trusts, the calculation of the number of trusts is carried out using indicators obtained by determining the average length and diameter of the sample stalks and the content in the fiber stalks, determining the fiber strength and the degree of workability of the trusts, and the average diameter of the stalks is determined by measuring the total Of the four groups comprising five stems, and the fiber content is determined along the entire length of the stems (without roots).

The described method allows to speed up and refine the quality assessment of trusts in comparison with the known ones. It is distinguished by the fact that the average diameter of the stems is determined | Immediately by simultaneous measurement of the cross-sectional area of all the stems of the sample, and the fiber content in the stems is determined by the fiber content in thirty-centimeter segments of the stems taken at a given distance from the roots of the cheek. The degree of workability of the trusts is determined by weighing the pre-cut and dried thirty-centimeter lengths of stems, fracture and scraping wood from them and re-weighting them.

The essence of the method is as follows. A bundle of 20 stems is taken and the area of its cross section is measured, which is directly dependent on the diameter of the stems; the average diameter of the stems is determined by area. The measurement is performed on a known instrument, which immediately shows the average diameter of the measured stems.

To determine the fiber content in the stems, cut out from 20 stems at a predetermined distance from the cheek roots are thirty-centimeter lengths and determine the fiber content in them in a known manner, which is usually the percentage of the fiber content in the whole stem.

No. 120337

The degree of workability of trusts is determined as follows: 40 stems are taken and cut, starting from the tip, thirty-centimeter lengths, which are dried, weighed and separated into bundles weighing 5-6 grams each, and then the wood is scraped out and scraped, which is done on the known instrument. A loose fire is given by shaking the beams lightly, then weighed again. The ratio of the initial and final sample weights shows the degree of workability of the trusts.

The average length of the stems and fiber strength is determined according to GOST 6729-53 and the number of trusts is calculated by the formula:

.. 1--0.4 „d -

  -d-0.7

where L is the average length of the stems in m,

C is the fiber content in units of x,

d - stem diameter in mm,

P is the breaking force of the fiber in kg.

To speed up the calculation, this form is transformed by logarithms into the sum of the logarithms of the lengths of the stems, fiber content, stem diameter and fiber strength and the tables determine the number of trusts, which are then multiplied by the coefficient K 0.42 + 0.17 I, where I is the degree of workability trusts.

Subject invention

The method of assessing the quality of hemp trusts, including the determination of the average length and diameter of the stalks of the sample and fiber content in the stalks, the determination of fiber strength and the degree of workability of the trusts, as well as the calculation of the number of trusts according to these indicators, In order to clarify and speed up the quality assessment of trusts, the average diameter of the stems is determined by simultaneously measuring the cross-sectional area of all the stems of the sample at once, the fiber content in the stems is determined by the fiber content in thirty centimeters zkah stems taken ies at a predetermined distance from the neck of the roots, and the degree of machinability trusts determined by weighing pre-cut segments and stems podusushennyh tridtsatisantimetrovyh, fracture and scraping them from the secondary timber and weighing them.