Key technologies and application analysis of liquid filter bag production process

Liquid filter bags have the advantages of high filtration efficiency, corrosion resistance, and easy installation and replacement. They are important components in many industrial processes. With the continuous development of industrial technology, the requirements for the quality, strength, and sealing of filter bags are also constantly increasing. In modern production processes, ultrasonic welding and hot air welding have gradually become key technologies to improve production efficiency and product quality.

2. Production process

The production process of liquid filter bags mainly includes the following three key steps:

2.1 Welding of plastic ring Top Collar and pp/pe fabric

In the production of liquid filter bags, the welding of plastic ring Top Collar is a crucial step. The plastic ring Top Collar provides support for the filter bag during installation and directly affects the stability of the filter bag. The commonly used welding technology is ultrasonic welding, which uses high-frequency vibration to heat the surface of the material by friction, so that the plastic ring and the non-woven fabric are tightly integrated. The advantage of ultrasonic welding is that no glue or welding materials are required, so seamless connection at the bag mouth can be ensured to avoid secondary pollution.

Advantages of ultrasonic welding

No pollution: No welding materials need to be added during the welding process, which reduces the pollution to the environment during the production process.

High strength: By adjusting the welding parameters, a firm connectioan between the ring and the non-woven fabric can be achieved to ensure that the bag body will not fall off under high pressure.

High efficiency: Ultrasonic welding is fast and suitable for mass production.

Specifications:

2.2 Non-woven fabric forming

The bag body is usually formed by rolling the non-woven fabric into a tube and sealing the edges with a hot air welding machine. The hot air welding machine blows out high-temperature hot air through a heating device to melt the edges of the non-woven fabric and fit tightly. This step determines the sealing and durability of the bag body.

Advantages of hot air welding

Strong adaptability: Hot air welding can be used for non-woven fabrics of various thicknesses and has strong adaptability to materials.

Uniform welding: Hot air welding can achieve uniform forming of the bag body, avoiding problems such as leaks and insufficient welding strength.

High durability: Hot air welding provides high-strength welding, which can effectively improve the pressure resistance and wear resistance of the bag body.

2.3 Bag tail sealing

The sealing of the bag tail is the last process of the finished liquid filter bag, which is usually completed using an ultrasonic sealing machine. Sealing the bag tail with ultrasonic technology can achieve high-quality sealing, ensuring that the filter bag will not leak when in use.

Requirements for sealing technology

High sealing: The quality of the bag tail sealing directly determines the service life and filtering effect of the filter bag.

Precise control: Ultrasonic sealing can accurately control the sealing position and welding strength to ensure the beauty and practicality of the sealing.

Specifications:

3. Key technologies and process parameters

In the production of liquid filter bags, the welding quality directly affects the strength and sealing of the bag body, so the process parameters need to be accurately controlled. The following are several key parameters:

Welding time: The ultrasonic welding time needs to be adjusted according to the material thickness and type to ensure the strength and durability of the welding.

Temperature setting: The temperature of hot air welding should match the melting point of the non-woven fabric to avoid excessive temperature causing material damage.

Pressure control: In ultrasonic welding, appropriate pressure can ensure that the materials are fully in contact and welded firmly.

4. Application and effect

Liquid filter bags using ultrasonic welding and hot air welding have a high service life and good filtering performance. It performs well in filtering accuracy, flow control, chemical corrosion resistance and other aspects. A large number of application practices have shown that precision welded filter bags have played an important role in the fields of chemical, food, medicine, etc.

In the production process of liquid filter bags, ultrasonic welding and hot air welding are key technologies to improve product quality. By precisely controlling the welding parameters, the durability, sealing and filtering effect of the filter bags can be effectively improved. In the future, with the development of automated production equipment, the production process of liquid filter bags will be more efficient and environmentally friendly, bringing more high-quality filtering solutions to industrial production.