Three-Paper-One-Film Ultrasonic Valve Bag
The three-paper-one-film ultrasonic valve bag is constructed with three layers of Kraft paper plus one layer of PE film.
Its core technological breakthrough lies in replacing traditional adhesive bonding or stitching with ultrasonic welding, achieving molecular-level fusion between the valve and the bag body through high-frequency mechanical vibration.
This process innovation delivers distinctive advantages in sealing reliability and environmental performance, making it suitable for a wide range of packaging applications—from standard building materials to high-risk chemical products.
Key Advantages
Exceptional Sealing Durability
The molecular bonding layer formed by ultrasonic welding remains crack-free across a temperature range of –40°C to 80°C and is unaffected by humidity.
It effectively eliminates the common issue of adhesive failure during rainy or humid conditions, extending the sealing lifespan to over 24 months.
Enhanced Resistance to Damage
An integrated flat-bottom welding structure ensures uniform stress distribution.
Under a 50 kg load, the bag withstands drops from 2 meters without damage, supports stacking heights of up to 4.5 meters, and shows a 12.5% improvement compared with inner valve bags.
Environmental Compliance and Safety Assurance
With no adhesive residue, the bag complies with FDA food-contact standards and EU REACH regulations, while the welding process generates zero VOC emissions.
Its explosion-proof design is suitable for packaging high-risk chemicals such as sulfur and aluminum powder, and it meets ATEX explosion-proof certification requirements.
High-Efficiency Automation Compatibility
Compatible with ultrasonic packaging machines equipped with integrated vacuum tubes, air is extracted during filling to increase material bulk density by 15%.
The combined filling and sealing time is reduced to 6–8 seconds per bag, and when paired with an automatic palletizing system, it can reduce labor requirements by 3–4 workers.
