Polyester Weight Reduction Agent

Weight loss is controlled by the combination of agent dosage, alkali concentration, processing temperature, and processing time. Higher temperature and longer time increase hydrolysis, while lower values reduce it. Because the relationship between these parameters and the final weight loss depends on the specific fiber and fabric construction, pre-testing is required to establish the process window for each target level. Pre-testing also helps avoid excessive strength loss at high weight loss levels.

Controlled surface hydrolysis removes a small amount of surface fiber and therefore reduces tensile strength to some degree. The extent depends on the weight loss level and the process conditions. Higher weight loss produces lower strength. The agent is formulated to support controlled weight loss while limiting excessive strength loss within the recommended range. Pre-testing tensile strength at the target weight loss level is recommended, particularly for fabrics with demanding strength requirements.

Yes. Weight reduction can be carried out before dyeing, and the modified surface may affect dye uptake. The sequence and conditions must be pre-tested for the specific dye class and shade. In some processes weight reduction and dyeing are combined in a single bath, while in others they are separate stages. The choice depends on the target weight loss, the dye class, and the equipment available.

Uneven weight loss can result from uneven alkali distribution, uneven liquor circulation, temperature gradients within the machine, or fabric packing that restricts flow. The agent promotes uniform hydrolysis but cannot fully compensate for machine or loading issues. Even liquor circulation, correct loading, and controlled alkali addition support uniform results. Pre-testing on the actual machine configuration is recommended.

Polyester and elastane blends require careful process control because elastane is sensitive to high temperature and alkaline conditions. Weight reduction on blends must be carried out within a process window that limits damage to the elastane component. The specific grade and process conditions should be confirmed from the technical data sheet and pre-tested on the actual blend ratio and elastane content.

When applied within the recommended conditions, the effect on shade is limited and Delta E typically remains below 0.5 for most disperse dyed shades. Because weight reduction modifies the fiber surface, it can affect dye uptake if applied before dyeing. The shade result depends on the process sequence, dye class, and weight loss level, and pre-testing on the actual fabric and shade is advised.

Store in a cool, dry area away from direct sunlight. Protect from freezing below 5 degrees Celsius. If the product freezes, thaw slowly at room temperature and stir before use. Keep containers closed when not in use to prevent contamination. Shelf life is 12 months in the original unopened container under recommended conditions.