HARD SHEET AND METHOD FOR PRODUCING THE SAME

• Main Authors: NAGAYAMA REI, MEGURO MASASI, TAKAOKA NOBUO, HAYASHI KOICHI
• Format: Patent
• Language: English
• Published: 07.01.2016
• Subjects: BRAIDING; COTTON-WOOL; DRESSING OR CONDITIONING OF ABRADING SURFACES; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; GRINDING; KNITTING; LACE-MAKING; LAUNDERING; MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL; NON-WOVEN FABRICS; PERFORMING OPERATIONS; POLISHING; TEXTILES; TRANSPORTING; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS; TRIMMINGS; WADDING

Provided is a hard sheet including a non-woven fabric of ultrafine fibers and elastic polymer added into the non-woven fabric. JIS-D hardness of the sheet is 45 degrees or more. R % thereof calculated by R (%)=(D hardness maximum−D hardness minimum)/D hardness average×100 is 0 to 20%, when a sectional surface of the sheet extending in the thickness direction thereof is evenly divided into three parts corresponding to a first outer layer, an intermediate layer, and a second outer layer in order from any one surface side of the sheet; JIS-D hardness measurements are made at six points being three arbitrary points each on the first outer layer and on the intermediate layer; and then the JIS-D hardnesses obtained are used for the calculation. In the sheet, the total content of ions capable of changing the pH of water is 400 μg/cm3 or less.