Ultrasonic Hemming Woven Bag Machines: Efficient, Clean, and Durable Bag Mouth Solutions

In the packaging industry, the quality of a bag’s mouth is just as important as the material itself. A clean, strong, and well-finished bag mouth ensures easier filling, better handling, and a professional appearance — all of which contribute to customer satisfaction. At Wenzhou Qianfeng Machinery, we provide advanced woven bag machines equipped with ultrasonic hemming technology, designed to deliver consistent, durable, and visually appealing bag mouths for a wide range of applications.
 

Two Configurations to Meet Your Needs

We offer two configurations of ultrasonic hemming machines, both sharing the same reliable hemming system but tailored for different bag types:

4-in-1 Model (QF-QTFQ-750): Cutting + Liner Insertion + Bottom Sewing + Ultrasonic Hemming

Designed for woven bags with inner PE liner.
Automatically inserts the liner after cutting, sews the bottom, and performs ultrasonic hemming on the bag mouth.
Ideal for packaging products that require moisture protection or leak prevention, such as fertilizer, flour, powders, resin granules, and chemicals.
Ultrasonic hemming secures the inner liner in place, preventing it from shifting or slipping during handling and filling.
 

3-in-1 Model (QF-QFQ-650): Cutting + Bottom Sewing + Ultrasonic Hemming

Suitable for woven bags without inner PE liner.
Performs cutting, bottom sewing, and ultrasonic hemming in one continuous operation.
Perfect for dry granular products like rice, feed, seeds, plastic granules, or charcoal.

Both models fold the bag mouth inward by 2.5–3.5 cm (adjustable), creating a clean, flat, and durable bag edge.
 

Ultrasonic Hemming: Key Advantages

Neat and Strong Bag Mouth

The bag mouth is folded inward and sealed with ultrasonic welding, keeping it flat, visually appealing, and highly durable.
 

Inner Liner Fixation

For bags with liners, the ultrasonic weld locks the liner at the bag mouth, ensuring it stays firmly in position and does not shift.
 

Efficient and Automated

Eliminates the need for additional heat sealing or manual folding, saving time and labor.
 

Consistent Quality

Provides repeatable results with minimal maintenance.
 

Durable Performance

Prevents fraying and deformation during filling, transport, and storage for dry and granular materials.
 

Ideal Applications

Agriculture

Rice, corn, seeds, and feed packaging
 

Chemical & Industrial Products

Fertilizer, resin pellets, plastic granules
 

Energy & Biomass

Charcoal, wood pellets
 

Food & Consumer Goods

Dry granular products requiring clean, durable bag mouths
 

E-commerce & Export Packaging

Empty bags with custom prints and logos
 

Why Choose Our Machines

Adjustable hemming width: 2.5–3.5 cm to suit different bag specifications.
High automation: Reduce labor costs and improve production efficiency.
Versatility: Handles multiple bag types, both laminated and non-laminated.
Consistent quality: Every bag mouth is neat, flat, and strong.
Enhanced visual appeal: Perfect for branded packaging and export-ready bags.
 

Conclusion

A well-finished bag mouth is crucial for product integrity, handling, and customer perception. Our ultrasonic hemming woven bag machines provide a clean, durable, and efficient solution for both lined and unlined bags. By combining cutting, bottom sewing, liner insertion (optional), and ultrasonic hemming, these machines streamline your production while delivering consistent, professional results.
 

Explore our 3-in-1 and 4-in-1 ultrasonic hemming machines today and upgrade your packaging line for efficiency, reliability, and superior bag quality.
 

Email: [email protected] / [email protected] 
WhatsApp: Camela+86-15868562229 / Leilei +8615868562226
 

Wenzhou Qianfeng Machinery Co., Ltd.
Nov. 7, 2025