A-Z Full-Package Non-Woven Bag Manufacturing – High-Productivity Automatic System

1. Current risks from fragmented production processes

Using multiple independent suppliers (fabric suppliers, processing workshops, printing workshops) causes 3 direct damages to businesses:

  • Inconsistent quality: Each unit applies a different inspection standard.
  • Cost inflation: Continuous transit shipping costs between workshops.
  • Delayed schedules: Downtime occurs along with the risk of disruption at process intersections.

Our Solution: Closed-loop full-package production

We completely replace the fragmented model with an automated operating system, applying 20 kHz ultrasonic welding technology at a single factory.

The entire process from loading raw material rolls to exporting finished logo-printed bags is centrally controlled with a 3-NO commitment:

  • NO intermediaries.
  • NO waiting time between stages.
  • NO quality variance between batches.
non-woven-bag-production-line
Vietsonic ensures fabric quality and eliminates rupture risks thanks to ultrasonic welding technology.

2. Our capacity in the closed-loop production chain

Proactive source of PP non-woven fabric

Choosing the wrong parameters leads to two direct risks for the business:

  • Choosing too thin fabric: The bag does not meet the breaking strength, causing tears during use, damaging goods, and directly affecting the brand image.
  • Choosing too thick fabric: Excess material costs arise, uselessly increasing production unit prices, causing serious budget damage for orders of tens of thousands of products.

To thoroughly solve this risk, our technical team intervenes with analysis right from the reception stage. We do not ask customers to guess the grammage (gsm), but solve the problem based on 3 actual data points:

  1. Goods characteristics: Dimensions, shapes, and physical properties of the product to be contained.
  2. Load-bearing requirements: The maximum rated weight the bag must carry during use.
  3. Target budget: The allowable cost limit per packaging unit.

Based on this data, we accurately calculate and specify the optimal fabric grammage (gsm). We ensure that products leaving the factory achieve absolute mechanical safety margins while cutting off all material waste.

Vietsonic ensures fabric quality and eliminates rupture risks thanks to ultrasonic welding technology.
Vietsonic ensures fabric quality and eliminates rupture risks thanks to ultrasonic welding technology.

3. 100% automated production process

Once the raw materials are ready, the fabric rolls are fed directly into the production line – and from here, the entire process operates automatically with no manual intervention.

Our machinery system continuously performs 5 stages:

  1. Automatic fabric feeding: Loading PP rolls and synchronizing pulling speed with the line. Completely eliminates manual human intervention.

  2. Bag profile shaping: Folding and creating bag blocks (flat, side gusset, bottom) according to programmed parameters. Folding accuracy reaches millimeter standards.

  3. Monolithic ultrasonic welding: Ultrasonic waves create thermal bonding welds of fabric layers into a single unified block. Completely replaces traditional thread sewing, eliminating 100% of connection breakage/bursting risks.

  4. Precise cutting according to programming: Ensures absolute consistency in dimensions across the entire batch. Specification deviation equals zero.

  5. Counting and packaging: Finished bags are accurately counted according to the order quantity, neatly stacked, and packed ready for delivery.

These five stages take place continuously on a single line, without stops, and without manual transfer stages. Fabric goes in one end – finished bags come out the other. This is how we ensure high productivity and consistent quality across every product.

KOSGINER box bag production line – 100% Automatic
KOSGINER box bag production line – 100% Automatic

4. Application of 20 kHz ultrasonic welding technology in product shaping

Technical equipment configuration

At VietSonic, we operate ultrasonic welding machines with a power of 2000W and a frequency of 20 kHz – a configuration specifically designed for industrial PP non-woven fabric welding applications.

The material bonding mechanism is executed directly through 3 physical phases:

  • Mechanical vibration: The welding head applies high frequency, generating friction exactly at the contact points between fabric layers.
  • Localized heating: Kinetic energy converts into thermal energy, melting and blending the PP fiber structure at the molecular level.
  • Monolithic unification: The cooling process happens instantly, pressing the material layers into a single seamless block.

Technical output standards: Absolutely flat weld seams. The unified structure provides superior breaking strength limits compared to the mechanical perforation bonding of traditional thread sewing methods.

5. Technical advantages over specialized sewing

100% elimination of structural rupture risks: Thermal bonding at the molecular level completely replaces mechanical perforation bonding with needle and thread. Thoroughly eliminates thread breaking or seam bursting incidents, maintaining the bag’s integrity even under maximum load or continuous stretching.

Absolute aesthetic consistency: The weld lines are flat and seamless. The automation process completely eliminates defects caused by manual errors such as: misaligned seams, thread debris, or uneven stitch density. The bag surface achieves the highest level of neatness, optimized for brand logo printing.

Maintenance of material safety standards: The unification process of fabric layers only uses heat-generating mechanical energy, with absolutely no intervention of glues or chemical additives. The finished product is completely pure, directly meeting strict inspection standards for medical and food industry packaging.

Productivity meeting large orders

We eliminate theoretical parameters from catalogs. Actual operating speed at the workshop is measured stably at 60 – 80 products/minute.

Output productivity is quantified specifically as follows:

  • Standard shift (8 hours): Reaches 28,800 bags.
  • Operating 2 shifts/day: Exceeds 50,000 bags.
  • Weekly capacity: Reaches 250,000 – 350,000 bags.

With the closed automated system, we thoroughly solve the risk of schedule delays caused by manual labor issues. When there is a schedule requirement, productivity will increase in direct proportion to the number of shifts operated without spending time on hiring or training seamstresses. We commit to meeting delivery schedules accurately for every project scale.

Bag types we are currently providing

Flexible production systems allow us to manufacture according to drawings and technical specifications from customers. Below are the product lines we provide daily to customers nationwide.

Market and Supermarket Bags: Main output for the retail industry. Using PP fabric combined with high load-bearing ultrasonic welding, ensuring durability for multiple reuses, increasing brand logo visibility rates.

Die-cut Handle Bags: Optimized for the fashion and cosmetic industries. Handles are die-cut directly into the body using ultrasonic molds, helping to distribute force evenly (increasing load-bearing limits) and creating seamless blocks with absolutely no visible sewing thread.

Drawstring Bags: Applied as event packaging and consumer goods. Monolithic pressed body prevents tearing, bag mouth is reinforced with a sturdy drawstring for quick opening/closing.

Footwear Bags: Using fabric with 40–60 g/m² grammage. Low-grammage material ensures softness to prevent leather surface scratching and good breathability to prevent mold, enhancing the end customer’s unboxing experience.

Medical Bags (Wound dressing containers): Meets medical supply standards. Ultrasonic welds are completely sealed, eliminating 100% of impurity risks because no sewing thread or glue is used. Consistent quality across every product thanks to the automated system.

6. Optimizing cost and schedule through a full-package process

Customers only need to provide technical specifications (dimensions, fabric color, grammage, quantity, logo file). We directly execute all stages: technical design, equipment programming, automated production, silk-screen printing, quality control (KCS), and packaging. Concentrating all stages at a single production facility helps businesses completely eliminate intermediary costs and internal transportation time.

Step 1: Send us your technical specification sheet:

  • Bag dimensions (length × width × bottom gusset)
  • Desired fabric grammage (or let us advise you)
  • Bag type (die-cut, drawstring, flat bag…)
  • Order quantity
  • Logo file if silk-screen printing is required

Step 2: We respond with a full-package production quote – including raw material costs, processing, printing, packaging – along with a specific delivery schedule calculated in days.

Step 3: Approve samples, confirm production, receive goods on time.

No costs beyond the quote. No schedule delays beyond the committed timeline.

Application video:

Contact VietSonic

If you are looking for a high-quality bag production line, contact VietSonic immediately for optimal solution consulting.