Title:
CIGARETTE FILTER AND PRODUCTION THEREOF
Document Type and Number:
Japanese Patent JPS59227288
Kind Code:
A
Abstract:
Cigarette filters with improved efficiency and reduced resistance to gas flow, and a method of preparing them, are disclosed. The filters are made from crimped multicomponent polypropylene polymers having microfissures on their surfaces and micropores on their cross-sections, with 5 to 7 crimps per centimeter of length, and a unit fineness of 5 to 7 dtex. The elementary fibers in the bundle have different centers of gravity, and are present in ratios of from 1:3 to 3:1 by weight. The fibers are prepared by separate melting and thermal treatment of each polypropylene polymer component, having LVI values ranging from 100 to 200 ml/g, at temperatures ranging from 230 to 330 degrees C. The difference in LVI values between the components is from 30 to 50 ml/g, and at least one of the components has a 5-20% high molecular weight fraction, by weight, with an LVI of from 400 to 450 ml/g. Each component is homogenized separately, after which they are mixed from a nonhomogeneous flow of melts and extruded into a bundle through 3000 to 10,000 orifices in a spinneret. The bundle, or sliver, is treated with water, relaxed and fixed at a temperature of 70 to 140 degrees C., wrapped with paper, and cut into filters.
Inventors:
RUDORUFU SHIMO
SUTEFUAN BAKURAKU
RUBOMIIRU NOTEKU
YOZEFU PESHIARU
IBAN MITERUPATSUHA
YOZEFU FUDAKU
YAN SHIMO
YAN BADOURA
BIRAMU BESEDA
FURANTEISEKU MIHARII
AREKUSANDAA GUREGOORU
YAN KURISUKII
SUTEFUAN BAKURAKU
RUBOMIIRU NOTEKU
YOZEFU PESHIARU
IBAN MITERUPATSUHA
YOZEFU FUDAKU
YAN SHIMO
YAN BADOURA
BIRAMU BESEDA
FURANTEISEKU MIHARII
AREKUSANDAA GUREGOORU
YAN KURISUKII
Application Number:
JP7589884A
Publication Date:
December 20, 1984
Filing Date:
April 17, 1984
Export Citation:
Assignee:
BIZUKUMUNII USUTAFU KEMIKIHI B
International Classes:
A24D3/08; B29C48/00; D01F8/06; B29C48/05; B29C48/06; (IPC1-7): A24D3/06
Attorney, Agent or Firm:
Aoki Akira