Pipe liner and a method for manufacturing same
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United States of America Patent
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Sep 7, 1993
Grant Date -
N/A
app pub date -
Jun 24, 1991
filing date -
Jun 29, 1990
priority date (Note) -
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Abstract
A method of manufacturing a pipe liner with which a pipe is internally lined, forming a tubular body from a lengthy rectangular belt of a resin-absorbable flexible material by sewing the longer sides of the rectangle together; and coating either the inner or outer surface of the tubular body with an airtight plastic film, for example, by: (a) inserting the tubular resin-absorbable flexible material into the airtight plastic film tube; (b) wrapping the two-layer tube with a tubular film of release means; (c) inserting an inflatable bag into the multi-layer tube; (d) pneumatically inflating the inflatable bag to thereby radially press the multi-layer tube from inside to thereby cause the multi-layer tube to become cylindrical; (e) causing the airtight plastic film to adhere closely to the resin-absorbable flexible material by removing the air trapped between the resin-absorbable flexible material and the airtight plastic film tube by drawing the air from the resin-absorbable flexible material by means of a suction means; and (f) heating and fusing the airtight plastic film by means of a shiftable electric heater to thereby coat the resin-absorbable flexible material with the airtight plastic film.
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