What materials are used to make aroma sticks and moisture-absorbing sticks without glue?

Products like aroma sticks and moisture‑absorbing sticks achieve "binder‑free" performance mainly by adopting hot‑melt fibers (also referred to as low‑melting‑point fibers) as the bonding material. This process does not require extra chemical adhesives. Instead, part of the fibers melt under heat and bond other fibers together when cooled, producing rigid sticks with a porous structure.

Such fibers generally feature a core‑sheath structure: the sheath is made of low‑melting‑point material for thermal bonding upon heating; the core is high‑melting‑point material to maintain fiber geometry and structural support.

One of the most common formulations uses two grades of PET with different melting points achieved by adjusting their molecular weights. Fibers such as those from Pantone New Materials can be applied to manufacture aroma sticks, filter sticks, liquid‑absorbing sticks and other items.

Working Principle: The Secret behind Binder‑free Forming Mixing and forming: Blend hot‑melt fibers (low‑melting‑point sheath) with conventional fibers (e.g. PET, PA), or use hot‑melt fibers alone, then fill the mixture into moulds.

Advantages of this process Environment‑friendly & safe: No chemical adhesives are introduced throughout production, eliminating potential volatile organic compounds (VOCs) from adhesives for better environmental performance and hygiene.

Stable performance: Thermally‑bonded microporous structure is uniform and stable, delivering consistent volatilization or absorption performance.

Process‑saving: Steps such as adhesive application and drying are eliminated, simplifying production procedures and cutting costs.