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Preparing loom beams
It is necessary to apply a size formulation to acetate yarns to prevent them from becoming damaged during the weaving process. It is important to select the right combination of slasher equipment, size, and slashing procedure to ensure satisfactory results. In addition, it is important to carefully coordinate warp moisture and weave room conditions. Failure to do so can result in faulty warps and defective fabrics.
Slasher types
There are a variety of slasher types in use with acetate filament yarn. While conventional slashers are generally preferred in the United States, single-end slashers are common in other countries.
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Stretch level
The stretch level used is very critical and should be as low as possible. Excessive stretching reduces the elongation of the yarn, which can result in warp streaks after dyeing. Ideal stretch conditions should be between 4% and 6% for single-end and 6% and 8% for conventional slashers. Care should be taken during leasing to ensure that filaments are not broken during hard size breaks at the separator rods.
Single-end slashers tend to provide better protection for the yarn and create less broken filaments. However, they generally require less stretch.
Size selection
Size selection is critical to achieving optimum weaving efficiency, fabric quality, and cost. Factors that affect the size selection include:
- Ease of application
- Ease of removal
- Compatibility with yarn lubricants
- Cleanliness on looms
The choice of slashing formulation will also depend on slashing and weaving equipment used, fabric construction, and mill differences. Generally speaking, a typical size add-on would be about 3.5% by weight. Before selecting a size, the size supplier should be consulted regarding proper application.
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