How can double-layer blackout curtains achieve the flexible switching between "transmitting light but not seeing through during the day and completely blacking out at night"?

1. Layered design of physical structure

(1) Combination of gauze curtains and blackout curtains
Day mode: Only the outer gauze curtain (such as polyester, linen or tulle material) is used, with a light transmittance between 30% and 50%, which makes the light soft and keeps the room bright. At the same time, the weaving density of the gauze curtain achieves "light-transmitting but not see-through" to protect privacy.
Night mode: The inner blackout curtain (such as silver-coated, black silk interlayer or high-weight polyester material) is superimposed, with a light-blocking rate of more than 90%. The tight fabric structure or coating blocks light to achieve a completely black effect.

(2) Alternating stripe design
The fabric with alternating transparent and opaque stripes is used, and the stripes are aligned by pulling the control rope:
Day: The transparent stripes are aligned to allow natural light to enter;
Night: The opaque stripes are completely covered to achieve full light blocking.

2. Material and process innovation

(1) Interlayer and coating technology
Physical blackout cloth: adopts a three-layer structure (surface cloth + middle black silk/white silk interlayer + bottom coating) to achieve full light blocking by absorbing and reflecting light.
Environmentally friendly materials: such as linen blended blackout curtains, which take into account both drape and light blocking, and avoid the odor problem of traditional coated materials.

(2) High temperature setting and Korean pleating process
The curtain fabric is treated with high temperature setting to ensure uniform pleats and no gaps when closed;
The Korean pleating process enhances the verticality of the curtain fabric and improves the light blocking performance.

3. Practical application scenarios and optimization suggestions

Bedroom recommendation: Choose a combination of gauze curtains + full light blocking curtains, and install them with curtain boxes. The light blocking rate can reach more than 95%, which is suitable for people who are sensitive to light.
Living room and study: Use zebra curtains or double roller blinds to take into account light adjustment and decoration to avoid space oppression.
Maintenance tips: Avoid frequent machine washing of blackout curtains. It is recommended to wipe the coating surface with a damp cloth to prevent the light blocking layer from falling off.