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Woven Polypropylene (WPP) Glossary

Woven Polypropylene Sacks Glossary
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Polypropylene (PP) – A type of polymer used in producing mono-filament and multi-filament yarns and threads. It is recyclable and is used as our standard fabric for Woven Polypropylene bags.
Yarn / Tape – Extruded PP sheet, slit and stretched in annealing ovens to form part of the woven fabric for the bag.
Warp – Yarn or tape in a fabric, oriented perpendicular to the Weft yarn during weaving. This would go from top to bottom in the body fabric.
Weft – Yarn or tape in a fabric, orientated perpendicular to the Warp yarn during weaving. This would go from left to right in the body fabric.
Woven – Combined with many polypropylene yarns or tapes in two directions (warp and weft) to form fabric.
Fabric Weight – The measure of the fabric weight in ounces per square yard or grams per 100 square centimetres.
Stitches per Inch – A sewing specification requiring “X” number of stitches per inch. Like 4 stitches per inch.
Seam – A sew line made by the attachment / assembly of two or more components.
Top Hemmed / Hemming – A fold and sew operation which prevents fraying of cut fabric. This also provides a clean finish to the woven polypropylene bag. It may be either towards the inside or outside of the bag.
Body Fabric – The tubular portion of a seamless or circular woven bag.
Breathable Fabric / Bags – Uncoated or non-laminated fabric / bags.
Circular Woven Bag – Also called a tubular bag, it is made from fabric woven on a circular loom, which is then cut to the proper length for a specified bag height, thereby eliminating the seams on each of the bag’s sides.
Coated Fabric / Bags – Fabric lining coated / laminated with Polypropylene (PP) to prevent moisture intrusion or sifting of the inside contents of sack. Also called Non-breathable Woven or Laminated Woven Sacks/ Liner fabric.
Bag Size – width and length. Length dimension of the woven polypropylene bag measured from the Top Seam to the Bottom Seam. Sizes can vary of typical tolerance of + / - 3%
UV Stabilized – A feature of an unit of woven polypropylene bag that provides protection from prolonged exposure to the sun’s degrading Ultra Violet rays. A pigment is added to the resin prior to extrusion process of the yarns to provides UV stabilization to sacks.
Glenns Logs Supplies says...
Brilliant read and informative.
On October 23, 2017
Zaldy says...
How to get wpp denier on different mesh:
9×9
10×10
11×11
12×12
On August 16, 2017