Do You Know The Material of Dryer Fabric?

Raw Material of Dryer Fabric

The raw materials used in the production of dryer fabric are generally polyester round yarn or polyester flat yarn. The special environment of high temperature and high humidity in the drying section can easily cause damage to the polyester molecular chains, resulting in fine fibers on the surface of the single fibers. So the decisive factor affecting the service life of dryer fabric is not mechanical wear, but the degradation effect of humid and hot air, acid, alkali, or other chemicals. The fundamental way to solve this problem is to use monofilament varieties with special properties such as hydrolysis resistance and pollution resistance.

Hydrolysis Resistant Monofilament Dryer Fabric

Anti hydrolysis monofilament is obtained by adding anti hydrolysis agents during the production process of polyester monofilament. The figure shows the aging test results of anti hydrolysis monofilament and ordinary monofilament, in order to compare the performance differences between anti hydrolysis monofilament and ordinary monofilament. Aging test conditions: add water inside the anti-aging autoclave and heat it to 125~135 ° C in a closed manner, with a pressure of 200~300kPa.

From the graph, it can be seen that under high temperature and high humidity conditions, after 3 days of aging, the fracture strength of ordinary monofilaments begins to sharply decrease; After one week, the breaking strength of the hydrolysis resistant monofilament still remained above 50%.

According to monofilament manufacturers, anti hydrolysis agents will evaporate above 160 ° C, which is harmful to human health. Therefore, paper related to food production should be used with caution.

Anti Pollution Monofilament Dryer Fabric

The dirt on the dryer fabric can cause problems such as black spots on the paper web, uneven moisture distribution on the paper web, and reduced drying efficiency. The dryer fabric woven from polyester monofilament with fluorine added significantly improves its anti pollution ability. If Easykleen monofilament produced by Nextrush in Germany, Thermon etics monofilament used by Albany, and Synstron monofilament used by Voith are used to produce dryer fabric on paper machines made from waste pulp, their service life is extended and paper quality is guaranteed. Aston Johnson also developed and used a unique anti pollution flat wire with grooves.

Dryer Fabric Reinforced Edge PPS Monofilament

The use of anti hydrolysis monofilament in the dryer fabric body has achieved sustained high fracture strength and longer service life of the dryer fabric. During operation, the actual temperature on both sides of the dryer fabric in the width direction is higher than that in the middle part in contact with the wet paper web, and the web edge is constantly rubbing against the edge stopper, making it easier for the single fibers at the edge of the dry web to decompose and break in a high-temperature and humid environment. Although the middle of the web is mostly intact, it has to be discontinued. So, PPS (polyphenylene sulfide) monofilament reinforced edge dryer fabric was applied.

PPS is also known as polyphenylene sulfide. It has good chemical corrosion resistance and complete hydrolysis resistance. PPS monofilament is expensive (currently about four times the price of polyester monofilament), with soft material, poor wear resistance, and poor weaving performance. It is generally only used as a reinforcement for the edge of dryer fabric. In products with double warp flat wire dryer fabric, it is generally used at the edge of the dryer fabric that contacts the paper surface.