Abstract: The object of the present invention is to provide a sound absorbing material having a light weight and excellent sound absorbing performance, and a sound absorbing material consisting of a fiber sheet made of fibers containing at least 50% by mass of a porous fiber having many minute pores, each minute pore opening onto the surface of the porous fiber, and having an airflow resistance in the range of between 0.05 and 3.0 kPa·s/m. The porous fiber having many minute pores, each one opening onto the surface of the porous fiber, has air-permeability, and so a sound absorbing property in itself, and a sheet made of the porous fiber having air-permeability and sound absorbing property has even further sound absorbing properties created by the spaces between the porous fibers, resulting in the sheet becoming a sound absorbing material with extremely great sound absorbing efficiency.

Abstract: A lightweight sound absorbing surface material, having an excellent sound absorbing property and moldability, and a sound absorbing material using the sound absorbing surface material, are provided in the present invention. The sound absorbing surface material 6 is manufactured by laminating stretchable paper(s) which is(are) creped and/or embossed (such as a creped paper 1b) onto one or both sides of a fiber sheet 3. The degree of creping of the paper is in the range of between 10 and 50%, and the height of projections of the embossed paper is in the range of between 0.02 and 2.00 mm, with the number of the projections being in the range of between 20 and 200 projections/cm2. Further, the sound absorbing surface material 6 is laminated onto a air permeable sheet of porous material 7, to manufacture a sound absorbing material 8.

Abstract: [Subject] The subject of the present invention is to provide a shock and sound absorbing material having a light weight, and demonstrating an excellent shock and sound absorbing performance. As a method for solving the subject, the present invention provides a shock and sound absorbing material 1 comprising a porous component 2, and a surface material 3 which is laminated onto the porous component 2, wherein the surface material 3 has at least one layer made of a stretchable paper material 5. The shock and sound absorbing material 1 is installed on a cover panel 7 covering a sound source such as an engine cover, and the porous component 2 is set so as to face the cover panel 7, with the surface material 3 being set so as to face the sound source, and form a cell structure between the cover panel 7 and the surface material 3.

Abstract: The object of the present invention is to provide a sound absorbing material having a light weight and excellent sound absorbing performance, and a sound absorbing material consisting of a fiber sheet made of fibers containing at least 50% by mass of a porous fiber having many minute pores, each minute pore opening onto the surface of the porous fiber, and having an airflow resistance in the range of between 0.05 and 3.0 kPa·s/m. The porous fiber having many minute pores, each one opening onto the surface of the porous fiber, has air-permeability, and so a sound absorbing property in itself, and a sheet made of the porous fiber having air-permeability and sound absorbing property has even further sound absorbing properties created by the spaces between the porous fibers, resulting in the sheet becoming a sound absorbing material with extremely great sound absorbing efficiency.

Abstract: [Subject] The subject of the present invention is to provide a shock and sound absorbing material having a light weight, and demonstrating an excellent shock and sound absorbing performance. As a method for solving the subject, the present invention provides a shock and sound absorbing material 1 comprising a porous component 2, and a surface material 3 which is laminated onto the porous component 2, wherein the surface material 3 has at least one layer made of a stretchable paper material 5. The shock and sound absorbing material 1 is installed on a cover panel 7 covering a sound source such as an engine cover, and the porous component 2 is set so as to face the cover panel 7, with the surface material 3 being set so as to face the sound source, and form a cell structure between the cover panel 7 and the surface material 3.

Abstract: The object of the present invention is to improve the releasing property of a molded article. To attain the object, the present invention provides a release sheet 1 characterized by coating or impregnating an aqueous binder on/in to a porous sheet, wherein the porous sheet has preferably an airflow resistance of 0.01 to 1.2 kPa·s/m, and the porous sheet is a preferably creped and/or embossed stretchable paper, the aqueous binder containing (A) a polymer produced by radical polymerization of an ethylenical unsaturated dicarboxylic anhydride or an ethylenical unsaturated dicarboxylic acid whose carboxylic acid group can form acid anhydride group, and (B) an alkanolamine having at least two hydroxyl groups. The release sheet(s) 1 is (are) laminated onto a base material 2. When the laminated material is molded by heating, the aqueous binder quickly hardens, demonstrating its releasing property.

Abstract: A lightweight sound absorbing surface material, having an excellent sound absorbing property and moldability, and a sound absorbing material using the sound absorbing surface material, are provided in the present invention. The sound absorbing surface material 6 is manufactured by laminating stretchable paper(s) which is (are) creped and/or embossed (such as a creped paper 1b) onto one or both sides of a fiber sheet 3. The degree of creping of the paper is in the range of between 10 and 50%, and the height of projections of the embossed paper is in the range of between 0.02 and 2.00 mm, with the number of the projections being in the range of between 20 and 200 projections/cm2. Further, the sound absorbing surface material 6 is laminated onto a air permeable sheet of porous material 7, to manufacture a sound absorbing material 8.

Abstract: An object of the present invention is to prevent the occurrence of resinous gloss on the surface of a molded porous material into which a synthetic resin is impregnated, and to attain this object, the present invention provides a resin compound for processing a porous material by coating, impregnating or mixing it on/in to the porous material wherein a colloidal silica is added to a thermosetting resin in an amount of more than 5% by mass, so that when the porous material which is processed by the resin compound is press molded, and as the resin compound oozes to the surface of the resulting molded porous material, the colloidal silica prevents the occurrence of the resinous gloss on the surface of the molded porous material.