What are the steps to pay attention to in the process of manufacturing alkali free fiberglass filter bags?

2024-10-12 14:30:19

In the process of manufacturing alkali free fiberglass filter bags, special attention should be paid to the following steps:

Raw material preparation:

Fiberglass selection: The quality of alkali free fiberglass directly affects the performance of filter bags. It is necessary to choose fiberglass materials with low alkali metal oxide content, high quality, uniform fiber diameter, and compliance with relevant standards. For example, the deviation of fiber diameter should be within the allowable range, otherwise it will affect the filtration accuracy and strength of the filter bag.

Selection of additives: If additives such as coupling agents, anti-static agents, etc. need to be added, suitable types and models should be strictly selected, and their quality and compatibility with glass fibers should be ensured to be reliable. For example, the selection of silane coupling agents should be determined based on specific process and performance requirements to ensure effective enhancement of the bonding strength between fiberglass and other materials.

Weaving of base fabric:

Warp and weft yarn configuration: Determine the appropriate warp and weft yarn density and weaving method to ensure the tight structure, high strength, and uniform pores of the base fabric. The tension of warp and weft yarns should be controlled properly. Excessive tension may cause yarn breakage, while insufficient tension may loosen the fabric structure, affecting the filtering effect and service life of the filter bag.

Equipment debugging: the weaving equipment should be debugged in advance to ensure the normal operation of all parts and avoid faults in the weaving process, such as yarn winding, yarn breaking and other problems. Regularly maintain and upkeep the equipment, check the wear and tear of components such as needles and shuttles, and replace damaged parts in a timely manner.

Acupuncture process (if any):

Acupuncture parameter settings: Acupuncture depth, frequency, and intensity have a significant impact on the performance of filter bags. Needling too deeply can damage the fiberglass and reduce the strength of the filter bag; If the needle depth is too shallow, the fibers cannot be fully entangled, which affects the structural stability of the filter bag. The frequency and intensity of needle punching should also be adjusted reasonably according to the characteristics of the fiberglass and the requirements of the filter bag.

Needle board maintenance: Regularly inspect and replace the needle board of the needle punching machine to ensure that the needles on the needle board are arranged neatly and sharp, and to avoid affecting the needle punching effect due to needle wear or bending.

Post processing:

Heat setting: The temperature, time, pressure, and other parameters of heat setting should be precisely controlled. Excessive temperature or prolonged time may cause excessive shrinkage or performance degradation of glass fibers; If the temperature is too low or the time is too short, the ideal shaping effect cannot be achieved. During the heat setting process, it is necessary to ensure uniform heating and avoid local overheating or undercooling.

Surface treatment: According to the usage environment and requirements of the filter bag, corresponding surface treatment is carried out, such as coating with PTFE (polytetrafluoroethylene) or other coatings, to improve the corrosion resistance, water repellency, and filtration efficiency of the filter bag. The thickness and uniformity of the coating should be strictly controlled. Overly thick coating will affect the breathability of the filter bag, while too thin coating will not achieve the expected protective effect.

Sewing process:

Suture selection: Choose high-strength, high temperature resistant, and corrosion-resistant sutures, such as fiberglass sewing thread, and the thickness of the suture should match the material and thickness of the filter bag. The quality of the suture should comply with relevant standards to avoid breakage during use.

Sewing process: During sewing, it is necessary to ensure that the stitches are uniform and tight, avoiding problems such as missing seams and jumpers. For key parts such as the sealing and splicing of the filter bag, it is necessary to strengthen the sewing to ensure the sealing and structural strength of the filter bag.

Quality inspection:

Appearance inspection: Check the appearance of the filter bag for defects such as damage, stains, jumpers, and whether the size meets the design requirements. For filter bags with surface defects, they should be repaired or eliminated in a timely manner.

Performance testing: Strictly test the filtration accuracy, breathability, strength and other performance indicators of the filter bag to ensure that it meets relevant standards and usage requirements. For example, the filtration efficiency test is used to verify the filtering ability of filter bags for particles of different sizes.