Page 26 - 《橡塑技术与装备》英文版2025年12月

HINA R&P TECHNOLOGY AND EQUIPMENT

depth of 7.2 mm, a pattern saturation of 74.2%, and a with the addition of an appropriate amount of silica, providing
circumferential pitch of 42 composite pitches. This design both high abrasion resistance and tear resistance, ensuring
boasts four major advantages: high-speed driving performance.
(1) The overall horizontal grooves of the pattern feature (3) Lower tread layer (middle rubber layer): Low heat
an extremely narrow groove design, which minimizes air flow build-up buffer rubber is used to reduce heat build-up defects
and reduces noise generation to the greatest extent possible. in the tire shoulder during driving and extend service life.
(2) The walls of the longitudinal grooves in the pattern (3) Base rubber: The thickness is set to 0.8 mm,
feature vertically arranged noise-reducing lines, which can penetrating the tread rubber to create a "chimney effect" that
disrupt the rebound path of air within the grooves. can discharge ground static electricity, enhancing safety during
(3) The pattern pitch adopts a composite pitch of 5 sizes, use.
arranged and combined, totaling 42 pitches. The tread rubber extrusion process adopts a four-
(4) To increase the rigidity of the outer tread blocks, the composite extrusion technology to ensure tight adhesion of the
lateral grooves in the outer shoulder tread blocks are cut to be rubber compound; the sidewall is composed of sidewall rubber
half as deep as those in the inner tread blocks. and wear-resistant rubber, and the shoulder rubber compound
The tread pattern is shown in Figure 1. adopts a low heat build-up formula to meet the high-mileage
driving requirements of electric cars.
The tread structure is shown in Figure 2.

Figure 2 Tread structure diagram

3.2 Carcass
This specification chooses polyester fiber as the carcass
material. The main reason is that polyester fiber has excellent
heat resistance and thermal conductivity, high strength, and
minimal temperature influence. It has high resistance to
deformation when subjected to external forces, with minimal
Figure 1 Pattern style elongation, which can avoid problems such as driving deviation
and uneven tread wear caused by dimensional deformation,
3 Construction design and is conducive to tire dimensional stability.
The tire design features a wider tread area. Firstly, this The carcass is made of double-layer polyester fiber cord
increases the ground contact area, ensuring better lateral fabric with a specification of 1300D/2. After calculation, the
stability during high-speed lane changing and cornering. safety factor reaches 9.3, meeting the design requirements. The
Secondly, by reducing the unit normal pressure and shear force cord fabric is coated using a double-sided coating method and
on the ground contact area, it slows down tread wear, further produced on an S-type four-roller calender, achieving excellent
extending the tire's service life. coating quality and a calender thickness controlled at 1.15 mm.
3.1 Tread 3.3 Belt layer
To balance the wear resistance, low rolling resistance, The belt layer is the core load-bearing component of
and safety of the tire, the tread adopts a three-layer rubber radial tires. Its ability to restrain carcass deformation and
structure, consisting of four parts: crown rubber, middle layer its stress-carrying capacity directly determine the handling,
rubber, wing rubber, and base rubber durability, and safety of radial tires. Under the premise of
(1) Upper tread layer (tread cap rubber): The solution- meeting safety performance requirements, using lighter belt
polymerized styrene-butadiene rubber compound is selected, steel cord can not only reduce costs but also help reduce tire

51，No.12
·20· Vol.51 卷 第 12 期
·20·
第