Sarelli Interiors Textiles applies mechanical and chemical finishing treatments to light curtains to alter fabric transparency, improve drape, and meet commercial safety standards. Textile technicians process sheer fabrics weighing between 30 GSM and 85 GSM using calendering, antistatic coating, UV-resistant chemical baths, and certified fireproofing methods.
Calendering treatments for light curtain transparency
Calendering treatments pass sheer fabrics through heated heavy rollers to compress textile fibers, which increases the light transmission of the curtain. Sarelli technicians apply 40 to 60 bars of pressure at 160 degrees Celsius to smooth the surface of lightweight linen and silk blends.
The calendering process reduces the overall thickness of a 50 GSM silk organza by 12 percent while increasing the fabric gloss level. Sarelli operators process the sheer fabrics production runs at a speed of 15 meters per minute to prevent heat damage to delicate warp yarns. Mechanical polishing treatments require no chemical additives, which preserves the natural hand-feel of the base material.
Chemical treatments for curtain longevity and drape
Chemical finishing treatments coat light curtains with specialized polymer solutions to prevent static buildup, resist ultraviolet yellowing, and maintain dimensional stability. Textile engineers submerge the woven curtain panels in liquid baths before curing the fabric in industrial ovens at 140 degrees Celsius.
Antistatic treatments reduce the surface electrical resistance of synthetic sheer curtains to below 10^8 ohms, which stops the fabric from clinging to windows or attracting airborne dust particles. Yellowing-resistant treatments add UV inhibitors that protect light-colored fabrics from solar degradation for up to 2,000 hours of direct sunlight exposure. Sarelli applies softening agents containing silicone emulsions to improve the drape of stiff linen sheers. The softening treatments withstand up to 25 standard machine wash cycles at 30 degrees Celsius before the fabric loses the initial chemical coating.
Fireproofing treatments for commercial light curtains
Fireproofing treatments impregnate light curtain fibers with flame-retardant chemicals to meet strict European safety regulations for public spaces. Sarelli applies phosphorus-based flame retardants to sheer fabrics to achieve Class 1 fire resistance under the Italian UNI 9177 certification standard.
Commercial clients ordering from the fabrics collection require the safety certifications for hotel and restaurant installations. The fireproofing application adds approximately 5 to 8 percent to the total weight of the finished curtain. Sarelli guarantees the flame-retardant properties of treated polyester sheers for 50 industrial wash cycles at 60 degrees Celsius. Natural fiber sheers, such as pure cotton or linen, require re-treatment after 10 dry cleaning sessions to maintain the required fire resistance rating. Understanding the exact fabrics composition dictates which specific flame-retardant chemical compound the technicians must apply during the finishing phase.
Dimensional stability treatments for sheer fabrics
Dimensional stability treatments lock the woven structure of light curtains in place to prevent shrinking or stretching during washing and hanging. Sarelli uses a process called stenter framing to stretch the wet fabric to exact width specifications before heat-setting the material.
The stenter frame process feeds the sheer fabric through a 20-meter heated chamber at speeds of 12 meters per minute. The thermal setting process guarantees that a 300-centimeter wide sheer curtain will shrink less than 2 percent after a standard 40-degree Celsius water wash. Sarelli engineers monitor the tension of the warp and weft threads continuously to ensure the final curtain hangs perfectly straight without twisting. Clients can view examples of dimensionally stable sheers at the Sarelli showroom in Italy.
