Why is PVA PVOH BP-17(1788, 217, 22-88) suitable for water-soluble films? Let's first look at its key characteristics.
1. Excellent Cold/Warm Water Solubility.
BP-17 has a degree of hydrolysis between 87%–89%. Within this range, the molecular crystallinity is relatively low, allowing water molecules to easily penetrate and break hydrogen bonds. As a result, the film can rapidly swell and dissolve in room-temperature or even low-temperature (15°C–20°C) water environments, while remaining resistant to stickiness under normal storage humidity.
2. Superior Film-Forming Properties & Mechanical Strength Its medium degree of polymerization (around 1700) provides the film material with good tensile strength, puncture resistance, and flex resistance. During bag-making, heat-sealing, liquid filling, and subsequent transportation, the film is unlikely to rupture or leak.
3. Outstanding Barrier Properties (Odor & Grease) PVA film offers exceptionally high barrier performance against oxygen, nitrogen, carbon dioxide, as well as various oils and fragrances. This is crucial for laundry pods-it perfectly seals in fragrance volatility and prevents moisture from liquid detergents from reverse-penetrating and damaging the film structure.
In summary, it is widely used in the following products:
1. Daily Chemical Wash & Care: Laundry pods, laundry sheets, floor cleaning sheets, dishwasher capsules, etc.
2. Agricultural Chemicals: Agrochemical packaging bags for precise dosage · Pollution Prevention: Avoids soil white pollution caused by discarding traditional plastic packaging and eliminates hazards from volatile residual pesticides.
3. Medical & Healthcare: Medical laundry isolation bags · Infection Control: Contaminated sheets and clothing from infectious disease wards in hospitals can be loaded directly into PVA water-soluble bags. During washing, the entire bag is placed directly into the washing machine, where it dissolves without requiring healthcare personnel to touch the contaminated textiles, effectively preventing cross-infection.