SU1224366A1 - Engineering fabric for reinforcing rubber articles - Google Patents

Description

The invention relates to the textile industry and can be used in the manufacture of industrial rubber goods as a reinforcing support frame.

The purpose of the invention is to improve the operational characteristics by increasing the lateral stability of the fabric, and increasing its adhesiveness, ..

The drawing schematically shows the proposed fabric.

The fabric includes intertwined weft 1 and main 2 threads forming a structural interlacing angle with (equal to 47-50, the porosity of the main threads is 64-75%, the porosity of the weft threads is 60-71%, with; the porosity of the main threads exceeding the porosity of the weft is D-8%, the ratio of the coefficients of the twists of the main and weft threads is 1.33-1.75.

Reducing the difference in porosity of the main and weft threads, combined with a simultaneous decrease below the lower limit of the porosity of both systems of the threads, prevents free rubber mixtures deep into the fibers due to the smaller air layers and, therefore, reduces. strength of bond between fabric and rubber.

When reducing the lower limit of the interlaced structure angle and the ratio of the coefficient (1) of the patient to twists of the bases and weft threads, the transverse stability of the fabric skeleton decreases, caused by the alignment of the tensile elongations along the base to the weft of the gray fabric. In addition, a decrease in the twist of the thread during the fabrication process of the fabric causes their flattening on the calender and a decrease in the bond strength of the fabric with rubber.

Increasing the porosity of the main and weft filaments above the upper limit is possible due to an undesirable increase in the proportion of the natural component of the filament.

Exceeding the porosity of the main ones. yarns above the weft by an amount greater than 8% cause a decrease in the lateral stability of the fabric due to the additional dilution of the density of the fabric over the weft.

With an increase in the ratio of the twist coefficient of the main and weft threads to 1.75 and the increase in the structural interlacing angle to 60-70, the undesirable effect of twisting of the rubberized fabric strips during cutting is undesirable.

In addition, an increase in the twist of the yarn compresses the structure of the twisted yarn and reduces the porosity and bond strength of the fabric with rubber.

Table 1 shows the change in the operational properties of the proposed fabric (the porosity of the main yarns is 70.3%, the excess of the main ones over the weft yarns is 5.3%) with a change in the structural angle and constant values of porosity and the porosity of one system of yarns over the other. When the value of the structural angle is less than the lower limit of the formula, the operational parameters of the fabric deteriorate. When the structural angle is higher than the upper limit, although a positive increase in lateral stability occurs, however, the strength decreases.

5 connection of fabric with rubber, which reduces the service life of rubber products based on this fabric.

Table 2 summarizes the fabric performance, (structural

, the angle 49, the excess of the porosity of the main filaments over the weft 5.3%) with changing porosity and constant structural angle and exceeding the porosity of the fabric. When changing the value of porosity outside the range of values

formulas deterioration of the performance properties of the fabric for the reinforcement of rubber products. j Table 3 presents the dependence of the lateral stability and bond strength of a fabric with a structural angle 49 and a porosity of the main yarn of 70.3% with rubber on the excess of porosity with a constant structural angle and the porosity of the fabric. When you change Exceeding porosity outside the intervals, the formulas also deteriorate the performance of the fabric.

V

Example A fabric for the reinforcement of rubber products, formed by interlacing twisted main and weft threads with a linear density of 156 tex and porosity of the main and weft threads, respectively, 72 and 5 68%, has a structural weave angle of 47, the ratio of twists of the main and weft threads is 1.4.

five

The fabric is used as a reinforcement cage in the production of rubber pressure fabric hoses.

The proposed fabric has a transverse stability, expressed by the ratio of the tensile elongation of strips of fabric 50X200 mm in size on the base and a weft equal to 1.2. The bond strength of a fabric skeleton with a rubber layer is 2.4–3.4 kgf / cm, which is 2-3 times higher than the known norms, and 10–15% higher than the bond strength of commercially used combined fabric.

The proposed fabric has passed industrial tests in the production of rubber pressure fabric hoses. When testing the fabric, it was found that its use as a reinforcing material does not require a change in the composition of rubber compounds and the serial technology for the manufacture of hoses.

In addition, the use of yarns with a porosity of 60-75% in the fabric makes it possible to improve the performance of the fabric and to provide a higher bond strength of the fabric with a rubber gasket and to avoid stratification of ruffes and disruption of their integrity.

Table 1

Editor K.Shvydka

Compiled by N.Samarina Tehred o.Sopko

Order 1895/26 Circulation 425 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow,) K-35, Raushsk nab. 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Table 2

Proof. With. Shekmar

Claims (1)

TECHNICAL FABRIC FOR REINFORCING RUBBER PRODUCTS, containing twisted combined warp and weft threads, characterized in that, in order to improve performance by increasing the transverse stability of the fabric and increasing its adhesive ability, it has a structural weave angle of 47-50, porosity warp yarns is 64-75%, the porosity of the weft yarns is 60-71%, while the porosity of the warp yarns is 4-8% higher than the porosity of the weft yarns. ω СLE С> 1 1224366 2