Optical waveguides – Optical transmission cable – Loose tube type
Patent
1991-05-30
1992-08-11
Lee, John D.
Optical waveguides
Optical transmission cable
Loose tube type
385109, 385141, 174118, 174110N, 523173, G02B 644
Patent
active
051386852
ABSTRACT:
A communications cable (20) includes water blocking provisions which are microbial resistant. The water blocking provisions include a microbial resistant water blocking member (35) comprising a laminate which includes two tapes (37--37) with a superabsorbent powder (40) therebetween. Advantageously, the superabsorbent powder on contact with moisture swells to block further intrusion of moisture and to prevent its movement longitudinally within the cable. The tapes of the laminate may be non-cellulosic such as for example a spunbonded polyester material which has suitable tensile strength and which has a relatively high porosity and further which prevents the growth of fungus. An adhesive system (42) included in the laminate is sufficient to hold together the tapes and the powder without inhibiting swelling of the powder on contact with water.
REFERENCES:
patent: 4605729 (1986-08-01), Barnes et al.
patent: 4810571 (1989-03-01), Guthrie
patent: 4812014 (1989-03-01), Sawano et al.
patent: 4820577 (1989-04-01), Morman et al.
patent: 4867526 (1989-09-01), Arroyo
patent: 4874219 (1989-10-01), Arroyo et al.
Arroyo Candido J.
Paucke Walter J.
AT&T Bell Laboratories
Lee John D.
Somers E. W.
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