The jute bag process at a glance
From field to finished sack, a jute bag passes through eight main stages:
| Stage | What happens |
|---|---|
| 1. Harvest | Jute plants are cut at 3 to 4 months, when the fibre is at its best |
| 2. Retting | Cut stalks are soaked in water for 7 to 14 days to loosen the fibre |
| 3. Stripping & drying | Fibre is pulled from the woody core, washed and sun-dried |
| 4. Grading & baling | Fibre is sorted by grade (Tossa, White, Mesta) and baled |
| 5. Softening & batching | Fibre is softened with batching oil; vegetable oil for food-grade |
| 6. Carding & spinning | Fibre is combed into a sliver and spun into jute yarn |
| 7. Weaving | Yarn is woven into hessian or sacking cloth on looms |
| 8. Finishing | Cloth is cut, printed, laminated if needed, stitched into bags and inspected |
From plant to fibre: harvest and retting
Jute (Corchorus olitorius for Tossa, Corchorus capsularis for White) grows in the warm, humid delta of Bangladesh and is cut after about 3 to 4 months. The cut stalks are bundled and submerged in slow water to ret: over 7 to 14 days, natural microorganisms break down the gums binding the fibre to the woody stem, so the long bast fibres can be separated.
Stripping, drying and grading
After retting, the loosened fibre is stripped from the core by hand or roller, washed, and hung to dry in the sun. The dried fibre is then graded by strength, colour, lustre and cleanliness and pressed into bales. Grade decides the end use: stronger Tossa goes to finer cloth and yarn, lower grades to coarse sacking.
Softening, carding and spinning
At the mill the baled fibre is softened with a batching oil and water to make it pliable for spinning. For food-grade bags this is a food-safe vegetable oil rather than mineral oil, which is what makes them odourless and VOT. The softened fibre is carded, combed and cleaned into a continuous sliver, then spun and twisted into jute yarn of the required thickness.
Weaving into cloth
The yarn is woven on looms, warp and weft interlaced, into jute cloth. The weave and weight decide the product: a light plain weave makes hessian (burlap); a heavier twill makes sacking cloth for B-Twill and DW bags. This is the stage where the fabric's strength and look are set.
Finishing: cutting, printing and stitching
The cloth becomes a bag in the finishing room. For sacks, the cloth is cut to size, the mouth is hemmed and the bag is machine-sewn. For promotional bags, the cloth may be laminated with a thin LDPE film for water resistance, then cut, printed with the buyer's artwork, fitted with handles and stitched. Every batch is inspected before baling for export.
Where Zayin fits
We run this chain in-house: our own mill spins the yarn, weaves the cloth and sews the bags, so we control quality and price from fibre to finished sack rather than buying cloth from a third party. That is what lets us hold spec, offer food-grade VOT and inspection, and quote mill-direct.