A fabric coating may look smooth after drying but develop cracks, whitening or peeling when the material is stretched or folded.

In many cases, the problem comes from the balance between film hardness, adhesion and elasticity.

The film is too hard

A hard coating film can provide good surface strength, but it may not be flexible enough for stretch fabrics.

When the fabric moves, the coating must move with it. If the film cannot extend sufficiently, fine cracks or white marks may appear on the surface.

This is more common on knitted fabrics, elastic fabrics and other soft textile substrates.

The film is flexible, but the bond is weak

A softer resin may improve flexibility, but the coating still needs to remain firmly attached to the fibers.

Weak bonding can cause edge lifting, peeling or separation after rubbing, folding or washing.

For flexible fabric coatings, elongation and adhesion must be considered together.

The fabric loses its original hand feel

Increasing resin hardness or coating weight may improve film strength, but it can also make the finished fabric feel stiff or heavy.

An excessively soft film may create a different problem, such as surface tack or low abrasion resistance.

The resin therefore needs to provide enough film strength without restricting the movement of the fabric.

Drying takes too long

Water-based coatings require water to be removed during drying.

When a lower-solids resin is used, more water enters the process. This may reduce line speed or increase drying demand, particularly when a thicker coating is required.

A high-solids acrylic resin contains more film-forming polymer and may help achieve the required dry film with less water.

Its viscosity, leveling and foam control still need to match the coating process.

Testing on the actual fabric is essential

Polyester, nylon, cotton and blended fabrics have different surface properties.

Before production, the formulation should be checked for:

• Adhesion
• Stretching and recovery
• Surface cracking
• Washing resistance
• Wet and dry rubbing resistance
• Hand feel
• Surface tack

Sinograce Chemical offers a high-solids water-based acrylic resin for flexible textile coating applications.

It is designed to provide strong adhesion, high elasticity and good film-forming performance, making it suitable for coatings that need to withstand repeated stretching and bending.

Product selection should be based on the fabric type, coating method, drying conditions and final performance requirements.

Contact Sinograce Chemical for product recommendations and sample testing.