SU680904A1 - Method of controlling quality of rubberized non-vulcanized cord - Google Patents

Description

one

The invention relates to the rubber industry, and in particular can be applied in the tire industry to control the quality of belt curing on industrial calender cords.

Methods 1 are known for the ontrol of the quality of rubberized cord by the force of pulling out a single yarn from rubberized cord, a cut out sample, which is cut into three sections with a size of 300-300 mm. From each section, .10 strips 10 mm wide are cut out. From each end of the strip, one middle thread is released from rubber for a length of 120-150 mm. The rubberized part of the strip, from which the thread is removed, is cut with scissors. The other end of this thread, the remaining and rubberized part of the strip, is cut by a cutting tool blade 4 mm wide at a distance of 50 mm from the entrance of the thread to the Rubberized part, after which the samples of 30 pieces are pulled out.

Thread pulling is carried out on discontinuous machines of the type RM-30, DM-30 or the like. According to the data obtained, the average value of the pulling force is determined.

Methods are known for controlling the quality of rubberized unvulcanized cord for rubber content 2. These methods consist in the fact that each time two samples are cut out of the cord fabric going to the rereinning, the first one - before rubberizing (during rolling) across the entire width of the web and 1.5 m long , the second - after OBO rubberizing (on seaming), also across the entire width and 1.5 m length.

After 2 days curing, the samples are given a rectangular shape with an area of 1 m, they charge, the density of the cords in the non-rubberized cord is calculated, the diameter of the cords of the impregnated cords, the thickness of the rubberized cords are determined, and from these data

0 calculate the thickness of the rubberized unvulcanized cord, rubber content and pressing ratio.

The known methods do not allow using the results of a multi-day laboratory analysis of the quality of rubberized cord to control quality during the process of rubberizing cordan calandra.

The purpose of the invention is continuous quality control rubber cord

on the calender.

This is achieved in that the re-content is determined from the results of continuous measurement of the power consumed by the calender and comparing it with the nominal power requirement of the calender determined by the equation

where Y is the value consumed

power of the calender, kW} X - the value of the specific rubber consumption of the calender, k.

to it are the coefficients constant for a given brand of cord, rubber compound, temperature and speed. It has been experimentally proved that the value of the specific rubber consumption of the calender in the established process is equal in absolute value to the rubber content of the rubberized unvulcanized material and represents

the amount of rubber compound pressed into the inter-intake space of one m square of the cord web and superimposed on it on both sides by a given thickness of rubberized cord. This value can be measured during the process. The authors also established and experimentally, E $ 5 verified that for each brand of cord with a given top, tire, and other process parameters, there is a definite relationship between the value of specific rubber consumption, power consumption of the calender and its performance. This constraint is constrained by a correlation equation of the form

Y aX "€, where Y value consumed

power calender, kW; X is the value of specific rubber consumption, and and are the coefficients, the values

which for some

cord marks are given in

the table.

According to the obtained equations and the specified value of specific rubber consumption, which is equal in absolute value to the specified specific rubber content, the control values of the power are determined.

According to tolerances of deviations of rubber: rye (these tolerances are used for specific rubber consumption), using the correlation equations given, set the tolerances for the deviation of the power consumption of the calender, within which the high quality of the rubberized cord is ensured.

Example 1. Set the optimal optimal rubber content of the textile cord 18V 0.915 ±. 1 0.06 kg / m. Therefore, assume that without sacrificing the quality of the rubberized cord, the fluctuation range of the rubber content is in the range of 0.855 kg / m to 0.975 kg / m.

The deviation of the values of the power consumption of the calender beyond the specified limits entails a decrease in the quality of rubberized cord.

Example 2. Experimental verification of the proposed method for quality control of rubberized cord during rubberization of steel cord 40L15 at the manufacturing plant

a four-roll cord calender with an L-shaped arrangement of the rolls.

The quality control of obrezinivan Tsetallokorda carried out according to the following procedure.

In the course of the process, the technological process at the initial moment of time with the stabilized

thickness and other pair of leggings; A discrete registration of the values of the consumed calantsra is performed using a self-recording food X pods of type E E 390 according to the voltage and current of the electric motor of the calender.

At the same time, a sampling of rubberized cords is carried out, for which they are known in the laboratories1 & The methods determine the main indicators of the quality of rubberized cord - thickness, rubber content, pressing ratio and pull out force of a single thread.

Claims (2)

It was experimentally re-established that at the expenditure of consumed power of the calender, the value of which is inside the floor of tolerances and equal to 104.4 kW, the rubber content of the sample taken at this power also turns out to be in the area of tolerance and is equal to 2.003 kg / m, those. The rubberized rubber cable is at the same level and is considered high. With a calender power consumption of 110.4 kW, the value of which is above the tolerance zone, the radioelectric content determined by the sample is also higher than the allowable and equal to 2.040 kg / m, which indicates a decrease in the quality of the rubberized cord. With a calender power consumption equal to E14kW g, the value of the tire below the minimum permissible rubber content becomes lower than the allowable g values and is equal to 1.968 kg / m. The rest of the quality of the rubberized cord varies accordingly. The proposed method for controlling the quality of a rubberized unvulcanized cord allows continuously monitoring the quality of the process according to the indications of consumed power devices, and using the value to control and controlling the quality of cord rubbering in the process control system of the cord rubberizing, which will increase the efficiency process as a whole. Claims The method of controlling the quality of rubberized unvulcanized cord for rubber content is also distinguished by the fact that, in order to continuously monitor the quality of rubberization of a cord on a calender, reeon content is determined by the result of m continuous measurement of the power consumed by the Xander and compared with the nominal power of the calender , determined by the equation Y aX + ", where y is the value of knock on the required power of the calender, kW, X is the value of specific rubber consumption of the calender, KG / M shee-b are the coefficients , constant for a given brand of cord, rubber compound, temperature and speed, Sources of information taken into account in the examination 1. Volnukhin B, I, Badenkov P, F. Rubber and rubber, 1970, No. 11, p. 48. 2.Volukhin B.I., Investigation of the process of rubberizing tire cord on industrial calenddees, Autoref, on smsk, kand. fox. NIISHP, 1971,