Pipe liner bag and manufacturing methods therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 28, 2000
Grant Date -
N/A
app pub date -
Feb 24, 1998
filing date -
Feb 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pipe liner bag is provided with improved anti-peeling and anti-bursting properties by ensuring a high anti-peeling strength of the plastic film to be employed. The pipe liner bag has a tubular resin absorbent material, the outer surface of which is coated with a highly air-tight plastic film, and a hardenable resin impregnated in the tubular resin absorbent material. The tubular resin absorbent material is formed of tubular unwoven fabric subjected to the needle punching processing, where a side of the tubular unwoven fabric having stuck-out needles protruding therefrom is exposed to the outside to serve as an outer surface of the tubular resin absorbent material. The outer surface is coated with a plastic film.
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