EcoSize-CXW-111 Explained: Modified Starch Sizing for Ne 6–40 Cotton Yarn

Warp sizing is the single cheapest place in a weaving mill to lose money quietly. A beam that is under-sized breaks on the loom and drags weaving efficiency down by several points; a beam that is over-sized wastes chemical, loads the desizing bath, and stiffens the fabric. EcoSize-CXW-111 is the modified starch Seamens Enterprises supplies for the middle ground — a German-manufactured sizing agent formulated for cotton warp in the Ne 6 to Ne 40 range, which covers the great majority of what Pakistani weaving sheds actually run.

What Is EcoSize-CXW-111?

EcoSize-CXW-111 is a chemically modified maize starch used as a warp sizing agent for cotton yarn from Ne 6 to Ne 40. It is manufactured in Germany and supplied in Pakistan by Seamens Enterprises as part of the ECO-Series textile auxiliary range.

A sizing agent is a film-forming chemical applied to warp yarn before weaving so the yarn can survive thousands of cycles of abrasion against heald wires, reed dents and the shuttle or rapier path. The film binds protruding fibres to the yarn body, raises tensile strength, and reduces hairiness. Everything else in the sizing recipe — softeners, wax, antistatics — exists to modify how that film behaves.

Why Use Modified Starch Instead of Native Starch?

Modified starch gelatinises at a lower temperature, holds a far more stable viscosity in the size box, and forms a flexible film rather than the brittle one native starch leaves behind. That flexibility is the whole point: a brittle size film cracks under loom tension and sheds as dust, which is where a large share of warp breakage and shed-cleaning labour originates.

Native maize starch has to be cooked hard to break the granule open, and once cooked it retrogrades — the viscosity climbs during the shift, so the beam sized at hour one and the beam sized at hour six do not carry the same amount of size. In a mill running three shifts, that variance shows up as inconsistent loom performance nobody can trace back to the size kitchen.

How Much Sizing Agent Per Kg of Yarn?

Dosing runs from about 6–8 kg per 100 kg of yarn on coarse counts up to 14–16 kg per 100 kg on fine counts, because finer yarn has more surface area per kilogram and less inherent strength to start with. The table below is the working reference Seamens supplies with the product.

Two variables move a mill up or down within these bands. Higher warp density and higher loom speed push add-on toward the top of the range; a cleaner, lower-hairiness yarn from a well-maintained ring frame lets a mill sit at the bottom of the range and save chemical. Air-jet looms generally demand more size than rapier or projectile machines running the same construction.

Size Pickup: Verify, Don't Assume

Size add-on percentage on the beam is the number that matters, not the kilograms weighed into the mixing tank. Recipe and reality diverge because squeeze roller pressure, size box level, machine speed and solids concentration all move independently through a shift.

The standard check is straightforward: take a known length of yarn before and after sizing, dry both to constant weight, and calculate the difference as a percentage of the unsized weight. Doing this once per shift on each sizing machine catches drift long before the weaving floor reports it as increased breakage.

• Squeeze pressure — the primary control for add-on; check it against the recipe card at every count change, not just at shift start
• Size box solids — verify with a refractometer or oven-dry solids test rather than trusting the mixing record
• Machine speed — slowing the sizing machine raises contact time and pickup; speed changes need a squeeze-pressure correction
• Size box temperature — a falling box temperature raises viscosity and pickup mid-run without anyone touching a setting

Cooking, Size Box and Drying Parameters

The parameters below are the standard operating window for EcoSize-CXW-111 on conventional sizing machines. Mills running high-speed air-jet warp should confirm the final moisture figure against their own loom-shed humidity, which for weaving should sit in the 65–75% RH band.

Does It Work on Synthetic Blends?

EcoSize-CXW-111 performs on cotton and on cotton-rich blends up to roughly 35% polyester, but starch does not adhere reliably to polyester filament surfaces on its own. Starch is hydrophilic and bonds well to cellulose; polyester is hydrophobic, so the film sits on the filament rather than anchoring to it, and it strips off under loom abrasion.

For polyester-rich blends and fine synthetic counts, the ECO-Series answer is EcoPVA-GS. Many mills do not switch entirely — a blended starch/PVA recipe carries the cost advantage of starch on the cotton fraction while PVA handles adhesion on the synthetic fraction.

Shelf Life and Storage in Pakistani Godown Conditions

Sealed bags of EcoSize-CXW-111 carry a 12-month shelf life when stored between 5°C and 35°C, off the floor, and away from direct sunlight. In practice, humidity is the constraint that matters in Lahore and Faisalabad, not temperature.

Modified starch is hygroscopic. A bag left open or stacked directly on a concrete floor during monsoon absorbs enough moisture to cake, and caked material cooks to a different viscosity than the recipe assumes — which then shows up as unexplained pickup variation on the sizing machine weeks later.

• Pallet storage — never stack bags directly on concrete; use wooden pallets with air circulation underneath
• First-in, first-out — mark delivery dates on bags and rotate stock rather than working from the front of the stack
• Reseal opened bags — a partially used bag left open overnight in a humid godown is already compromised
• Batch traceability — record the batch number against each size mix so viscosity issues can be traced back to a specific delivery

Common Sizing Faults and What Causes Them

Most sizing complaints resolve to one of four causes, and the fault pattern usually identifies which one before anyone opens the size kitchen log.

Frequently Asked Questions

Seamens Enterprises has supplied textile auxiliaries to Pakistani mills since 1997 and formulates under an ISO 9001:2015 quality system, with ISO 45001 occupational health and safety certification. Full product and certification detail is available on the certifications page.