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Mechanically Produced Materials Of Nonwoven Fabric
Jul 06, 2017

Mechanically produced materials

Stitch bonded Nonwovens

According to the maliwatt technique in the German Democratic Republic [GDR] and the Arachne technique in Czechoslovakia, stitched nonwoven materials are made by joining  fibers into the fabric, which is moving through a knitting-stitching machine, stitching with threads placed and joined like foundation stitches on a knitting machine. Such nonwoven materials are used as thermal insulation or packing material or as the foundation in the manufacture of quilts, blankets and  jackets.

Thread-stitched nonwoven materials (Malimo materials; GDR) are made by stitching with one or more thread systems. They are used for decoration, for beach wear or for towels. Especially useful are thread-stitched materials with pile loops (half-loops), which can compete successfully with woven shag fabrics.  Sheet-stitched nonwoven materials are made by stitching a pile-woven textile sheet with napped yarn which facilitates improved structure and properties of the sheet. Foundations for tufted carpets (550 cm wide) are stitched with carpet yarn, using needles to pull it through the fabric. On the return motion of the needle, the worsted is caught on a hook, and a loop is made. To secure the loops, an adhesive is applied to the reverse of the carpet. Threadless nonwoven materials are made on knitting-stitching machines (Voltex material in the GDR and Arabeva in Czechoslovakia). Such materials may consist of fabric and cloth made of staple fibers. After the cloth fibers are pulled through the scrim, sturdy loops are formed on the reverse of the material, and a deep, fluffy pile is formed on the front. Such materials are used as thermal stuffing or linings for rugs and carpets and blankets. [9]

Mechanical interlocking

Mechanically interlocking includes spunlace (hydroentangled) and needlepunching. Spunlacing is a process[10,11] of entangling a web of loose fibers on a porous belt or moving perforated or patterned screen to form a sheet structure by subjecting the fibers to multiple rows of fine high-pressure jets of water.[12, 21]  The formed web  is first compacted and prewetted to eliminate air pockets and then water needled. Pressures as high as 2200 psi are used to direct the water jets onto the web. The impinging of the water jets on the web causes the entanglement of fibers. The jets exhaust most of the kinetic energy primarily in rearranging fibers within the web and, secondly, in rebounding against the substrates, dissipating energy to the fibers. A vacuum within the roll removes used water from the product, preventing flooding of the product and reduction in the effectiveness of the jets to move the fibers and cause entanglement.

The application of spunlace nonwovens includes kitchen and  bath  towels and wipes and also for bed linen as they are  eco-friendly, oil and water absorbent, bacteria proof with no smell and safe for sensitive skin.

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