Everything You Need To Know About the production process of waterproof bags

With the development of technology, the use of waterproof bags is becoming more and more popular, and more and more people's lives, whether it is commuting to work, or outdoor travel adventure, are gradually relying on the excellent waterproof performance and wear resistance of waterproof bags. They need to protect their belongings from the elements. But have you ever wondered how these waterproof bags that are waterproof and tear resistant are produced? The author has 17 years of experience in the development and production of waterproof bags, and our waterproof bag brand FLW has a large number of loyal customers in dozens of countries around the world. In order to give you a better understanding of the production process of waterproof backbacks, this guide will guide you through the entire waterproof bag production process, detailing each key step from material selection to final quality control.

 

Material selection

The production of waterproof bags begins with the selection of the right material, as this fundamental choice greatly affects the performance and durability of the bag. Whether you are an individual buyer or a waterproof bag distributor, the most important thing to understand when buying waterproof bags is the material of waterproof bags. As a high-quality waterproof bag manufacturer, we FLW need to understand your material requirements for the first time when communicating with you. The high-quality materials that can be used to make waterproof bags are:

• TPU (thermoplastic polyurethane) : TPU has excellent water resistance and tear resistance. It remains flexible even at extreme temperatures, making it ideal for high-performance waterproof bags. Its wear and oil resistance also improve the service life of the bag.
• PVC (polyvinyl chloride) : PVC is a more affordable alternative to TPU. It provides effective water resistance and is relatively durable. However, it tends to be less flexible at low temperatures and more prone to cracking. The production process of PVC also involves more chemicals, which can affect its environmental footprint.
• Choosing the right material: Choosing between TPU and PVC requires balancing factors such as cost, flexibility and durability. At FLW, rigorous testing is usually carried out, including water resistance testing and durability assessment, to ensure that the selected material meets specific performance standards.

 

Production steps

(a) Waterproof bag design phase

The design phase is crucial in shaping the final product, although we have a very popular waterproof bag design that supports both OEM and wholesale collaborations. But at the same time, we also support a new waterproof bag tailored to your brand. Our designers create detailed technical drawings and prototypes based on customer needs and intended use. This stage includes:

• Conceptualization: Determine the bag's size, shape, and functions such as pockets, straps, and closures.
• Prototyping: Create an initial prototype to test the functionality and ergonomics of the design.
• Final design: Refine the design based on prototype testing and feedback.

 

(b) Cutting and preparation

Once the design is finalized, the production process moves to cutting and preparation:

• Precision cutting: Cutting materials to exact shapes and dimensions using advanced cutting machines. The accuracy of this step ensures that all parts are properly aligned during assembly.
• Edge preparation: The edges of the cut parts may be treated or reinforced to enhance adhesion during welding.

 

(c) Welding and sealing

The core of the production of waterproof bags is to create waterproof joints. Several welding techniques are used:

• High-frequency welding: This method uses a high-frequency electromagnetic field to heat and fuse the edges of the material. It creates strong and durable joints without the need for additional adhesives. The technique is particularly effective for materials such as TPU and PVC.
• Laser welding: Laser welding uses high energy laser beams to melt and fuse materials. It provides precise control and strong bonding, especially for complex designs. However, it involves a significant investment in specialized equipment.
• Hot air welding: Hot air welding involves blowing heated air over the edges of materials to melt them and then pressing them together. The technology is suitable for complex shapes, but requires precise temperature control to avoid overheating.

At present, we have established 8 sewing production lines with about 150 machines, including cutting machines, high frequency welding machines, laser machines, double needle machines, napping machines, etc. Monthly production capacity 120-150K.

 

(d) Assembly and inspection

After welding, the bags are assembled, inspected and given final treatment:

• Assembly: Install straps, buckles, zippers and other components. This step usually involves stitching or additional welding to secure these parts.
• Initial quality inspection: Early inspection focuses on verifying the integrity of the joint and the proper assembly of the function.

 

(e) Functional testing

Bags undergo various tests, including water resistance tests, to ensure that they meet performance standards. This may involve dipping the bag in water or spraying it with water.

 

(f) Final inspection

Conduct a thorough inspection to uncover any deficiencies or inconsistencies. Correct any problems and prepare packing bags. At FLW, ensuring product quality is a big focus for us. We have 8 production lines, each line has a QC who will check the quality on the production line.

 

Manufacturing technology

Advanced technology plays an important role in the production of waterproof bags:

• High frequency welding: This technology is known for its efficiency and strong bonding and is often used in mass production due to its fast speed and high reliability.
• Laser welding: provides high precision and clean joints, but requires significant equipment and technology investment.
• Hot air welding: Although more versatile and able to handle complex designs, operating costs and energy consumption are higher.

Each welding method is selected according to the design complexity, material type and production volume, FLW mainly uses HF welding seam technology and RF welding seam technology.

 

Quality control

Quality control is essential to ensure that waterproof bags meet the highest standards:

• Material testing: Each batch of material is tested for water resistance and overall durability. This may include laboratory tests that simulate real-world conditions.
• Joint inspection: Check welded joints for leakage and strength. Techniques such as pressure testing or dye penetration testing can be used to detect weak spots.
• Functional test: Test the usability of the bag to ensure that zippers, straps, and other functions are functioning properly. This stage also includes checking overall comfort and ease of use.

 

A robust quality control system helps prevent defects and ensures that each bag performs as expected, providing reliable protection.

FENGLINWAN(FLW) has passed ISO-9001/13485 quality management system certification, BSCI certification, each production line is equipped with a specialist to do quality testing. It also supports you to appoint a third-party testing agency to test the product before loading. We also equipped you with a perfect after-sales system, received products if there are defects, we support one to one return.