Dynic Corporation

Norio Umezu

Toshiyuki Nishijima

Noboru Tsukahara

Shinichi Fukui

Kazumasa Mizui

Yutaka Saisho

Sampei Kobayashi

Takuichiro Masuda

An air filter material includes a laminate of an air inlet layer and an air outlet layer, and has a mean flow pore size of 20 &#x3bc;m to 40 &#x3bc;m, a minimum pore size of 2.4 &#x3bc;m to 3.8 &#x3bc;m, and a maximum pore size of 80 &#x3bc;m or less. The air inlet layer is a needle punched nonwoven fabric layer having an areal fiber weight of 55 g/mto 100 g/m. The air outlet layer is a laminated spunlace nonwoven fabric made by laminating at least two or more spunlace nonwoven fabric layers having an areal fiber weight of 20 g/mto 60 g/m, a mean flow pore size of 50 &#x3bc;m to 90 &#x3bc;m, a minimum pore size of 3.0 &#x3bc;m to 10.0 &#x3bc;m, and a maximum pore size of 180 &#x3bc;m or less.

Air filter material

A nonwoven fabric, particularly composed by long-stock synthetic resin yarns such as polyethylene and polypropylene is provided at one or both surfaces thereof with an ink-setting layer formed by coating, drying and curing a resin composition containing some of acrylic resins, synthetic rubbers and polyester resins. The ink-setting layer is excellent in the transfer property and fixing ability to an oil ink which is ordinarily used for offset printing, and prevents the nonwoven fabric from being swelled or transformed by a petroleum high-boiling-point solvent contained in the oil ink. Preferably, a low-temperature cross-linking agent is incorporated with the resin composition of the ink-setting layer so as to complete cross-linking of the resin composition at a low temperature at which heat shrinkage or heat damage of the nonwoven fabric will not be caused, in a shortened period of time. Moreover, when 10 to 40% by weight of non-calcined clay, 1 to 15% by weight of titanium dioxide and 1 to 10% by weight of calcium carbonate or calcined clay are incorporated as fillers in the resin composition of the ink-setting layer, the ink-setting layer has improved absorbability, drying ability and fixing ability to a printing ink. A preferable construction of the nonwoven fabric has a first layer containing the low-temperature cross-linking agent and a second layer containing the specific filler ingredients.

Nonwoven fabrics for printing

An air-filtering material exchangeably attached to a home-use or automobile air filter comprises a water jet type nonwoven fabric at an air outlet side and another type nonwoven fabric or fiber assembly at an air inlet side. These nonwoven fabric sheets are laminated on one another by needle punching. The water jet type nonwoven fabric is made from crowded finer fiber staples, and bits formed therein by penetration of needles of a needle punching machine may be stopped up by centripetally moving fiber staples surrounding the bits.

Composite air-filtering material

Growing community of inventors

Fukaya, Japan

Norio Umezu