High shear strength clay liner, method and apparatus for its production
AssigneeLaviosa Chimica Mineraria S.P.A.
InventorsPiero Starita, Maurizio Paoli
Life of this patent
Estimating the term…
Abstract
Apparatus for forming a high shear strength clay liner comprising two synthetic geotextiles surrounding a semihydrated layer of swellable clay. The apparatus includes two parallel needle bars each carrying a row of needles reciprocating in opposed directions and cooperating with a reciprocating needle plate having a plurality of parallel fingers and a looper bar with a plurality of parallel looper plates rocking on an axis to form loops which can be melted to form protruding knots.
Claims8
Apparatus for producing a geosynthetic clay liner from a liner formed by two synthetic geotextiles surrounding a layer of swellable clay, comprising:
- (a) a fixed machine frame;
- (b) means for moving said liner along a feeding direction through said frame;
- (c) a pair of parallel needle bars, each parallel needle bar carrying at least one row of needles;
- said needle bars arranged crosswise with respect to the feeding direction and axially reciprocating in opposite direction with respect to each other;
- said needle bars being further reciprocated in a direction perpendicular to the plane along which the liner is moved through the machine so as to form corresponding seams extending along the feeding direction in a substantially zigzag path;
- (d) a looper bar parallel to said needle bars and located at a side opposite said needle bars with respect to liner and looper plates extending radially from said looper bar in a side-by-side spaced relationship, said looper bar adapted to move in a rocking motion about its longitudinal axis toward and from said needles to engage the thread around each looper plate when the needle has gone to a downstroke and thus forming a loop at one side of the liner;
- (e) means for locking said loops and sealing a passage hole for the thread through the geotextile;
- (f) means for moving said needle bars in synchrony with said looper bar.
Dependencies are inferred from the claim text.