The manufacturing process and quality control of Nomex felt pad

Nomex felt pads are a high-performance industrial felt widely used in aluminum rolling, glass processing, steel smelting, and other fields.
It has excellent features such as heat resistance, fire resistance, and scratch resistance.
The main raw material of the Nomex felt pads is Nomex fiber, a high-performance aromatic polyamide fiber with high strength, high modulus, high heat resistance, high chemical resistance, and other properties.
This article aims to discuss the manufacturing process and quality control methods of the Nomex felt pad.
To provide reference and guidance for the production and application of Nomex felt pads.

Manufacturing process

The basic manufacturing process of the Nomex felt pad is as follows:

Fiber opening:
Nomex fibers are opened, mixed, and carded through an opening machine to make them loose, even, orderly, and arranged into a network structure.
Pre-needle punching:
The fiber web is needled through a pre-needle punching machine to form a preliminary felt structure to increase its strength and stability.
Heat setting:
The pre-needle punched felt is heat-set through a heat-setting machine to shrink and solidify at high temperatures to increase its density and heat resistance.

 
Post-needle punching:
The heat-setting felt is needled through a post-needle punching machine to form the final felt structure and increase its thickness and uniformity.
Resin treatment:
The needle-punched felt is impregnated, dried, and cured with resin through a resin treatment machine to form a resin film on the surface to increase its fireproof and scratch-resistant properties.

The parameter settings and operating points of each process are as follows:

Fiber opening:
The speed of the opening machine is 800-1000 rpm, and the opening time is 10-15 minutes.
The fiber mixing ratio is 80% Nomex fiber + 20% other fibers to improve the heat resistance and softness of the Nomex felt pads sex.
Pre-needle punching:
The needling density of the pre-needle punching machine is 1000-1500 n/cm2, and the needling depth is 8-12 mm.
The needling speed is 200-300 m/min to ensure the strength and stability of the Nomex felt pad.
Heat setting:
The temperature of the heat setting machine is 200-250°C, and the pressure is 0.5-1.0 MPa.
The speed is 50-100 m/min to ensure the density and heat resistance of the Nomex felt pads.

Back needling:
The needling density of the back needling machine is 500-1000 n/cm2, and the needling depth is 6-10 mm.
The needling speed is 100-200 m/min to ensure the thickness and uniformity of the Nomex felt pads.
Resin treatment:
The resin concentration of the resin treatment machine is 10-20%, and the drying temperature is 150-200°C.
the drying time is 10-15 min, the curing temperature is 200-250°C, and the curing time is 5-10 min.
Guaranteed fire resistance and scratch resistance of Nomex felt pads.

The impact of each process on the performance and quality of the Nomex felt pad is as follows:

Fiber opening:
The speed of the opening machine is 800-1000 rpm, and the opening time is 10-15 minutes.
The fiber mixing ratio is 80% Nomex fiber + 20% other fibers to improve the heat resistance and softness of the Nomex felt pad sex.
Pre-needle punching:
The needling density of the pre-needle punching machine is 1000-1500 n/cm2, and the needling depth is 8-12 mm.
The needling speed is 200-300 m/min to ensure the strength and stability of the Nomex felt pads.
Heat setting:
The temperature of the heat setting machine is 200-250°C, and the pressure is 0.5-1.0 MPa.
The speed is 50-100 m/min to ensure the density and heat resistance of the Nomex felt pads.

Back needling:
The needling density of the back needling machine is 500-1000 n/cm2, and the needling depth is 6-10 mm.
The needling speed is 100-200 m/min to ensure the thickness and uniformity of the Nomex felt pads.
Resin treatment:
The resin concentration of the resin treatment machine is 10-20%, and the drying temperature is 150-200°C.
the drying time is 10-15 min, the curing temperature is 200-250°C, and the curing time is 5-10 min.
Guaranteed fire resistance and scratch resistance of Nomex felt pads.

QC

The quality inspection standards and methods of Nomex felt pad are as follows:

Appearance inspection:
Check whether the surface of the Nomex felt pad is smooth, free of impurities, burrs, and delamination.
And damage through visual inspection or instruments to ensure its appearance quality.
Dimensional measurement:
Use a ruler or instrument to measure the length, width, thickness, density, etc.
Of the Nomex felt pads to ensure that its size meets the requirements.

Physical performance testing:
Test the strength, elongation, wear resistance, temperature resistance, etc.
The Nomex felt pads through a tensile machine or instrument to ensure that its physical properties meet the requirements.
Chemical performance testing:
Test the fire resistance, flame retardancy, chemical resistance, etc.
of the Nomex felt pads through a burner or instrument to ensure that its chemical properties meet the requirements.

The key points and difficulties in quality control of the Nomex felt pad are as follows:

Surface flatness:
The surface flatness of the Nomex felt pads is an important factor affecting their use effect and appearance.
It is necessary to strictly control the fiber opening, needling, heat setting, and resin treatment.
And other parameters in each process to avoid surface roughness. , uneven phenomenon.
Impurity-free:
The impurity-free nature of the Nomex felt pads is an important factor affecting its service life and safety.
It is necessary to strictly control the cleanliness, dryness, and impurity-free fiber during raw material selection.
Storage, transportation, processing, and other links to avoid the mixing of impurities. , pollution, and corrosion phenomena.
No burrs:
The burr-free edge of the Nomex felt pads is an important factor affecting its use effect and appearance.
It is necessary to strictly control the cutting, trimming, protection, and other operations of felt during cutting, packaging, and transportation.
And other links to avoid burrs, breakage, etc. falling phenomenon.

No delamination:
The non-delamination of the Nomex felt pad is an important factor affecting its service life and safety.
It is necessary to strictly control the bonding, curing, impregnation, and other parameters of the felt in acupuncture.
And heat setting, resin treatment, and other links to avoid Delamination, delamination, and peeling.
No damage:
No damage to the Nomex felt pads is an important factor affecting its use effect and appearance.
It is necessary to strictly control the maintenance, cleaning, protection, and other measures of the felt during use, storage, and transportation.
And other links to avoid damage, wear, and burn. loss phenomenon.

The quality improvement measures and directions of the Nomex felt pad are as follows:

Raw material selection:
Choose high-quality Nomex fiber and other fibers to improve the heat resistance and softness of the Nomex felt pads and reduce the generation of impurities and defects.
Process optimization:
Optimize the manufacturing process of the Nomex felt pad, adjust the parameters of each process, improve the strength, density, wear resistance, temperature resistance, fire resistance, and scratch resistance of the Nomex felt pads, and reduce shrinkage, deformation, cracking, and separation—the occurrence of defects such as layering and delamination.

Equipment upgrade:
Upgrade the manufacturing equipment of the Nomex felt pads, using advanced opening machines, needle punching machines, heat setting machines, resin processing machines, etc. to improve the manufacturing efficiency and quality of the Nomex felt pads and reduce equipment failures and maintenance costs.
Management specifications:
Standardize the manufacturing management of Nomex felt pads, establish a complete quality management system, standardized operating procedures, quality inspection records, quality feedback mechanisms, etc., to improve the manufacturing level and quality stability of Nomex felt pads.

We are a professional manufacturer of Nomex felt pads. Our products have the following advantages:

We use high-quality Nomex fiber and other fibers to ensure the heat resistance and softness of the Nomex felt pads.
Which is suitable for various high-temperature, high-pressure, and high-speed industrial environments.
We use advanced manufacturing processes and strictly control the parameters of each process to ensure the strength, density, wear resistance, temperature resistance, fire resistance, and scratch resistance of Nomex felt pads, and meet the various needs of customers.
We use high-precision quality testing equipment to comprehensively test the appearance, size, and physical properties.
And chemical properties of the Nomex felt pads to ensure the appearance quality, size compliance, stable performance, safety, and reliability of the Nomex felt pad.

We continue to improve quality, introduce new materials, processes, equipment, and standards, improve the manufacturing efficiency and quality level of Nomex felt pad, and win the trust and praise of customers.
Our Nomex felt pad is your best choice and we look forward to cooperating with you.

I hope they will be helpful to you. If you have any other questions, please feel free to communicate with me at any time.
If you have any questions, you can also watch our Facebook website：www.facebook.com/nomexfelt