Provide a practical and less expensive alternative in producing a stable base with adequate drainage. Sewing geotextile fabric together has proven to be more effective, cost efficient and structurally superior than overlapping or other installation methods.

Union Special Machine Company, the world's largest manufacturer of industrial sewing equipment, features the most effective method of sewing support fabric quickly and economically.

Rugged, Portable Unit Seams light to medium weight fabrics Easily adjustable stitch length Upper and Lower Feed Dog (for seaming hard to feed fabrics) Single or Double thread stitch type Electric or Pneumatic Motor Specifications: Two thread, 401 stitch, single needle Adjustable stitch length (3-8 1/2 SPI) Dual feed mechanism 1200-1700 stitches per minute 3/8" sewing capacity Electric or pneumatic motor Easily converted to single thread, 101 stitch	Hand-Held portable units sewing geotextile fabric.
Union Special 80200Z-2715A Two-needle, heavy-duty, unit sews two parallel rows of stitching simultaneously Eliminates double sewing and overlapping Produces a strong and secure double lock seam on medium to heavy weight Industrial fabrics Reduces fabric installation costs Easily adjustable stitch lengths Can be mounted either vertically or horizontally for field or in-plant operations Specifications: Two rows of 401 stitch, double needle 9/32" between rows of stitching Adjustable stitch length (3-4 SPI, Std.)(5-8 SPI Optional) Up to 1800 stitches per minute 3/4" sewing capacity For in-plant or field use (Tabling or hanging assembly, optional)
401 Stitch Thread Usage Guidelines Mathematical formula for determining thread usage for each line of stitching. 4 + [ 2 x (thickness of seam) x (1 / length of 1 stitch)] = inches of thread use per inch seam Guidelines for estimating thread usage for each line of stitching Light weight fabric - 4 yards of thread for each yard sewn Medium weight fabric - 6 yards of thread for each yard sewn Heavy weight fabric - 9 yards of thread for each yard sewn Linear Travel Matching RPM / (RPM Stitches per inch x 12 Inches per foot) = Feet per minute Example: 800 RPM / (5 Stitches per inch x 12 Inches per foot) = 15 Feet per minute
Commonly Used Federal Seam Types: SSa ("Prayer" Seam)
SSn ("J" Seam)
SSd ("Butterfly" Seam)