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Fig 1. Schematic representation of leno weave pattern 5. Manufacture. 5.1 Raw material. The tape shall be manufactured from virgin food grade High Density Polyethylene (HDPE)/Polypropylene (PP) of the required quality. If required by buyer, the tapes shall be manufactured from combination of HDPE/PP with Linear Low Density Polyethylene (LLDPE)/Low Density Polyethylene (LDPE) to get desired softness. The tapes can also be manufactured by using only Polypropylene. Tapes shall also be manufactured from UV stabilized HDPE/PP if desired by the buyer. 5.2 Fabric The fabric used in the manufacture of HDPE/PP leno woven sacks shall be woven as a tube on a circular loom from the HDPE/PP tapes having width 3mm; Linear density 850 denier (weft) and width 2mm; Linear density 600 denier (warp). If manufactured from the combination of PP tapes and HDPE multifilament strands, the PP tapes shall have a width 3mm; linear density 850 denier(weft) and the weft shall have two strands of HDPE filaments with a linear density of 450 deniers. The denier of HDPE/PP tape used in the manufacture of leno woven fabric/sacks shall be subjected to the following tolerances: a) 10 percent (%) on individual value, and b) 5 percent (%) on average. The fabric shall be woven in accordance with leno weave with low weave density. The constructional particulars of fabric are given in Table 1. 5.3 Sack 5.3.1 Seam Leno sacks fabricated out of woven fabric shall have seam at the bottom and/or side. The stitching shall be done with two rows of either lock stitch or chain stitch. The two rows of stitches shall be separated from each other by about 5 mm and the outer row of stitching shall be approximately 8 mm from the outer edge of the sack. The stitching shall be done with single fold or double fold over seam to a depth of 25 mm, so that the stitches pass through a minimum of four or six layers of the fabric respectively as the case may be. The number of stitches/dm shall be 14 ± 2. 5.3.2 Stitching Thread The material used for stitching shall be HDPE/PP tape or any other thread suitable for the purpose, compatible to the product being packed in the sack. The tape or thread used for stitching shall have at least 20 percent higher denier than that used for making of the sack. The stitching shall be uniform without any loose thread or knot.PDF Image | High Density Polyethylene HDPE Textiles
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