PP woven sacks are bags made from polypropylene fabric, woven from flat tapes on circular looms, then cut, printed and stitched into bags for 25 kg and 50 kg loads. They are supplied laminated or unlaminated, with or without an inner liner, and in BOPP-printed versions for retail packs of rice, flour, sugar, animal feed and similar goods. Gujarat is one of the main producing regions in India, with polypropylene resin made within the state.
The fabric starts as a cast polypropylene film that is slit into tapes a few millimetres wide, stretched to build strength and wound onto bobbins. A circular loom weaves the tapes into a tube, so the sack has no side seams, and the tube is cut to length, folded and stitched at the bottom.
Common sizes and specifications
- 25 kg sacks: typically around 45 to 55 cm wide and 75 to 85 cm long, with fabric of roughly 60 to 90 GSM, for seed, chemicals, feed and food products.
- 50 kg sacks: typically around 55 to 65 cm wide and 95 to 110 cm long, with fabric of roughly 70 to 110 GSM, for fertiliser, grain, sugar, cement and minerals.
- Mesh density: expressed as tapes per inch in warp and weft, commonly from 8 by 8 to 12 by 12, with higher counts giving a tighter and stronger fabric.
- Lamination: a thin polypropylene coating on one or both sides that stops dust and moisture; unlaminated fabric breathes and is used for grain and some feeds.
- Liners: a loose or stitched-in polyethylene inner bag for hygroscopic products or fine powders.
- Closure: a plain hemmed top for sewing after filling, or a valve for cement and powders filled on packing machines.
- Printing: flexographic print in one to four colours directly on the fabric, or a BOPP film laminated over the fabric for photographic-quality retail prints.
Points that decide quality
Fabric weight, tape denier, mesh count and lamination thickness all govern the strength of the sack, and all can be reduced quietly to cut cost. A sack that passes a drop test at the sample stage may fail in bulk if the fabric runs light. Stitching matters as much: the thread type, stitches per inch and whether the bottom is single or double folded decide whether the bag survives handling.
UV stabilisation is needed if sacks will be stored outdoors, since untreated polypropylene becomes brittle in sunlight within months. State the storage conditions and shelf life you expect, and ask the plant to confirm the UV additive in writing.
Buying from India
Minimum orders are usually set by loom time rather than bag count, and a plant will typically quote per thousand bags with a fabric specification attached. A written specification covering size, GSM, mesh, lamination, print, stitching and packing, including bale size and bags per bale, removes most disputes. Sealed samples tested for GSM, tensile and seam strength give a reference the bulk can be checked against.
How we help
We visit sack plants in Gujarat, audit the looms and conversion lines, and send sealed samples to an NABL-accredited lab for GSM, tensile and seam strength. Before shipment we inspect the bales, supervise loading and send a weekly update, with one approved supplier and one backup. A free 20-minute sourcing review is the simplest way to get started.