A composite panel with a thermosetting cellular matrix, a method for manufacturing said panel, and a structure for covering a wall that is formed from an assembly of such panels. The structure provides the wall with heat insulation against cryogenic fluids and/or protection against fire or flames and/or sealing against the fluids. A panel having a thermosetting cellular matrix, includes at least one substrate that includes short, non-woven basalt fibers and is impregnated by the matrix. The panel is such that the at least one substrate includes a plurality of non-woven layers stacked to a stacking thickness. The non-woven layers each include the short basalt fibers and are needled through the thickness without using thermoplastic fibers.

A wet sheet for cleaning includes multiple layers and is impregnated with a chemical solution. The wet sheet includes hydrophobic fiber layers arranged in a front surface layer and a back surface layer, and a hydrophilic fiber layer arranged in an intermediate layer. The hydrophobic fiber layers have an interlaced part with a high fiber density where the hydrophobic fiber layers are interlaced with the hydrophilic fiber layer. The interlaced part has at least one slightly interlaced part and at least one highly interlaced part which is formed in a dent shape and which is interlaced with a higher fiber density. The highly interlaced part is formed in an area ratio of 10 to 20% to an area of the front surface layer or the back surface layer. Static friction resistance of the wet sheet for cleaning is lower than kinetic friction resistance of the wet sheet for cleaning.

A wet sheet for cleaning includes multiple layers and is impregnated with a chemical solution. The wet sheet includes hydrophobic fiber layers arranged in a front surface layer and a back surface layer, and a hydrophilic fiber layer arranged in an intermediate layer. The hydrophobic fiber layers have an interlaced part with a high fiber density where the hydrophobic fiber layers are interlaced with the hydrophilic fiber layer. The interlaced part has at least one slightly interlaced part and at least one highly interlaced part which is formed in a dent shape and which is interlaced with a higher fiber density. The highly interlaced part is formed in an area ratio of 10 to 20% to an area of the front surface layer or the back surface layer. Static friction resistance of the wet sheet for cleaning is lower than kinetic friction resistance of the wet sheet for cleaning.

A cleaning cloth has a microfiber composite fleece material in which a first and a second fiber component are arranged in the form of alternating layers, wherein at least one first layer A has the first fiber component in the form of composite filaments which are melt-spun and deposited into a fleece and which are at least partially split into elementary filaments having an average titer of less than 0.1 dtex, preferably between 0.03 dtex and 0.06 dtex, and solidified, and wherein at least one layer B is arranged on the first layer A, wherein the layer B has the second fiber component in the form of fibers deposited into a fleece and solidified and having an average titer of 0.1 to 3 dtex, at least one second layer A is arranged on the layer B.

A cleaning cloth has a microfiber composite fleece material in which a first and a second fiber component are arranged in the form of alternating layers, wherein at least one first layer A has the first fiber component in the form of composite filaments which are melt-spun and deposited into a fleece and which are at least partially split into elementary filaments having an average titer of less than 0.1 dtex, preferably between 0.03 dtex and 0.06 dtex, and solidified, and wherein at least one layer B is arranged on the first layer A, wherein the layer B has the second fiber component in the form of fibers deposited into a fleece and solidified and having an average titer of 0.1 to 3 dtex, at least one second layer A is arranged on the layer B.

The disclosure describes a low density cloth preform, and apparatuses and methods for manufacturing the same. The low density cloth preform has a lower density than other preforms manufactured using prior apparatuses and methods, thereby rendering the low density cloth preform more amenable to the addition of matrix carbon thereto through the use of less expensive carbon sources and more rapid processes for adding matrix carbon. The apparatuses and methods for manufacturing the low density cloth preform comprise preform needling machines configured and preform needling processes operable to provide a more uniform and lesser needling depth with the result being a preform having a lower density. The preform needling machines utilize foam bases formed from resilient materials having appropriate rebound rates, arrangements of barbed needles in one or more groups and needling stages, and positioning of the barbed needles to minimize deflection of the foam bases and preform material.

The disclosure describes a low density cloth preform, and apparatuses and methods for manufacturing the same. The low density cloth preform has a lower density than other preforms manufactured using prior apparatuses and methods, thereby rendering the low density cloth preform more amenable to the addition of matrix carbon thereto through the use of less expensive carbon sources and more rapid processes for adding matrix carbon. The apparatuses and methods for manufacturing the low density cloth preform comprise preform needling machines configured and preform needling processes operable to provide a more uniform and lesser needling depth with the result being a preform having a lower density. The preform needling machines utilize foam bases formed from resilient materials having appropriate rebound rates, arrangements of barbed needles in one or more groups and needling stages, and positioning of the barbed needles to minimize deflection of the foam bases and preform material.

Provided is a fiber structure having a high dust holding capacity. The fiber structure includes a thick fiber group composed of fibers A each having a single fiber diameter larger than 5 ?m and a thin fiber group composed of fibers B each having a single fiber diameter of 5 ?m or smaller, and has an intermingled region in which the thick fiber group and the thin fiber group are intermingled.

Provided is a fiber structure having a high dust holding capacity. The fiber structure includes a thick fiber group composed of fibers A each having a single fiber diameter larger than 5 ?m and a thin fiber group composed of fibers B each having a single fiber diameter of 5 ?m or smaller, and has an intermingled region in which the thick fiber group and the thin fiber group are intermingled.

A sheet manufacturing apparatus includes: a web forming unit that includes a first depositing unit which forms a first web by depositing a first mixture containing fibers and a second depositing unit which forms a second web by depositing a second mixture containing fibers on the first web, and that forms a web for processing; and a processing unit that manufactures a sheet by performing processing including heating with respect to the web for processing formed by the web forming unit.