Lightweight thermal insulation materials tend to undergo compression during service or under minor mechanical loads. To enhance mechanical performance and reduce deformation, material density is typically increased; however, this increases structural mass and production costs. In this study, the possibility of producing corrugated sheets from textile fabrics using various technological approaches and manufacturing thermal insulation materials from them was investigated. It was found that a corrugated structure improves the material’s mechanical and deformation properties without increasing either density or thermal conductivity. The density of specimens made from corrugated sheets ranged from 51.9 to 76.8 kg/m³, while their thermal conductivity varied between 0.0385 and 0.0535 W/(m·K). The primary factors affecting these parameters were the wave geometry and the adhesive layer’s properties. In contrast, sheets of the same composition but not bonded exhibited lower densities (29.8–51.3 kg/m³) and thermal conductivity values ranging from 0.0371 to 0.0530 W/(m·K). Article in Lithianian. Banguotų lakštų geometrinių parametrų įtaka termoizoliacinių medžiagų šiluminėms savybėms Santrauka Mažo tankio šilumos izoliacinės medžiagos eksploatacijos metu arba veikiamos nedidelių apkrovų pasižymi polinkiu suslūgti. Siekant padidinti jų atsparumą apkrovoms ir sumažinti deformacijas, įprastai didinamas medžiagos tankis, tačiau tai lemia didesnę konstrukcijos masę ir didesnes gamybos sąnaudas. Šiame tyrime, taikant skirtingus technologijos sprendimus, iš tekstilės pluoštų buvo suformuoti banguoti lakštai ir jų pagrindu pagamintos šilumos izoliacinės medžiagos. Nustatyta, kad banguota struktūra leidžia pagerinti mechanines bei defomacines savybes nedidinant nei tankio, nei šilumos laidumo. Iš banguotų lakštų pagamintų bandinių tankis kito nuo 76,8 iki 51,9 kg/m³, o šilumos laidumas – nuo 0,0535 iki 0,0385 W/(m·K). Esminę įtaką šiems rodikliams turėjo bangos geometrija ir klijų sluoksnio savybės. Analogiškos sudėties, tačiau nesuklijuotų lakštų tankis buvo mažesnis (51,3–29,8 kg/m³), o šilumos laidumas svyravo nuo 0,0530 iki 0,0371 W/(m·K). Reikšminiai žodžiai: šilumos laidumas, medžiagos tankis, banguoti lakštai, atsparumas apkrovoms, šilumos izoliacinės medžiagos, stipruminiai rodikliai.

Low-density thermal insulation materials tend to settle during operation or under small loads. Resistance to loads and settling is ensured by increasing the density of thermal insulation materials several times. This increases the weight of the material and the structure and production costs. In this work, using various technological processes, corrugated textile sheets and thermal insulation materials were produced from textile fabric. The development of such materials as effective thermal insulation materials for building insulation has not yet been studied. The corrugation of textile sheets enabled the thermal insulation material to exhibit good mechanical and deformation properties without increasing its density or thermal conductivity. The density of the specimens of the thermal insulation material made from corrugated sheets ranged from 76.8 to 51.9 kg/m³, and the thermal conductivity ranged from 0.0535 to 0.0385 W/(m·K). The most significant influences on density and thermal conductivity were the wave size and the adhesive layer. The density of unglued sheets of the same composition ranged from 51.3 to 29.8 kg/m³, and the thermal conductivity ranged from 0.0530 to 0.0371 W/(m·K). The highest compressive and bending strengths were observed in thermal insulation materials prepared from finely corrugated sheets. Their compressive stress at 10% deformation was 17.3 kPa, and their bending strength was −157 kPa. In comparison, the compressive stress of thermal insulation materials of the same density as non-corrugated sheets was only 0.686 kPa and, in the case of bending strength, 9.90 kPa. The obtained results show that the application of materials engineering principles allows us to improve the performance characteristics of materials.