United States Patent m
Hirakawa et al.
[li] Patent Number: 4,582,747 [45] Date of Patent: Apr. 15,1986
[54] DUST-PROOF FABRIC
[75] Inventors: Tadashi Hirakawa, Kusatsu; Mamoru Tsumoto, Ibaraki, both of Japan
[73] Assignee: Teijin Limited, Osaka, Japan
[21] Appl. No.: 701,557
[22] Filed: Feb. 14,1985
[30] Foreign Application Priority Data
Feb. 16, 1984 [JP] Japan 59-26132
Jun. 7, 1984 [JP] Japan 59-115391
[51] Int. CM D03D 15/00
[52] U.S. CI 428/229; 55/528;
55/DIG. 43; 55/DIG. 45; 428/311.1; 428/311.5; 428/315.5; 428/315.7; 428/317.9;
428/401; 428/922; 428/374
[58] Field of Search 428/229, 311.1, 311.5,
428/315.5, 315.7, 317.9, 922; 55/DIG. 43, DIG. 45, 528
[56] References Cited
U.S. PATENT DOCUMENTS
4,025,679 5/1977 Denny 55/528
4,499,139 2/1985 Schortmann 428/315.5
4,520,066 5/1985 Athey 428/311.5
4,539,255 9/1985 Sato et al 428/315.5
4,540,625 9/1985 Sherwood 428/311.5
4,547,423 10/1985 Kojima et al 428/317.9
FOREIGN PATENT DOCUMENTS
104548 6/1985 Japan .
Primary Examiner—James C. Cannon
Attorney, Agent, or Firm—Burgess, Ryan & Wayne
[57] ABSTRACT
A dust-proof fabric having an excellent dust-collecting efficiency and dust-preventing property including a plurality of filament yarns having a thickness of 20 to 400 denier and consisting of a plurality of individual filaments having a denier of 3.5 or less. The fabric has a number of pores formed therein and exhibits an air permeability of 0.3 to 10 ml/cm2/sec. In the fabric, the proportion of the integrated volume of pores having a size of 43 f«n or more to the entire integrated volume of all the pores in the fabric is 40% or less.
3,986,530 10/1976 Maekawa
12 Claims, 3 Drawing Figures
