Dryer clothes or dryer fabrics or felts have an important role in the dryer section. Synthetic dryer cloth or fabrics are also considered as conveyor belts.
As die papierweb die persgedeelte van die papiermasjien oorskry, is meer as die helfte van die gewig water. Die meeste water in die papierweb moet in die droër -gedeelte van die papiermasjien verwyder word om 'n finale voginhoud van 4 tot 6 persent te verseker. Die droërgedeelte is een van die mees energie-intensiewe komponente van die papiermasjien (ongeveer 60%). Daarom is die rol van die droër of skerm absoluut enorm.
Die droërstof druk die papierweb teen die oppervlak van die stoomverhitte droogsilinder. As gevolg hiervan, styg die temperatuur van die web en verdamp water in en deur die poreuse droërskerm. Daarbenewens help die droërstof die papierweb om van een drom na 'n ander te beweeg. Die droërskerm beheer die krimping van die web.
Dryer screen can be classified according to weave, category and combination method. Synthetic polyester dryer screen can be classified as one layer, one and a half layer, double layer, etc. according to the category. According to the weaving method, synthetic polyester dryer screen can be classified into 3 shuttle mouth, 4 shuttle mouth, etc. And as far as the combination method is concerned, the dryer can be divided into insert, pin, pin ring and spiral ring connection.
Seleksie: Die keuse van droërskerm of vilt hang af van verskillende papiermasjienparameters soos papiergraad, droërkonfigurasie, droër temperatuur, lugbalans in die enjinkap, ens. Die ontwerp en materiaal van die droërskerm is ook baie belangrik.
For a specific paper machine; the dryer permeability, design and material should be adjusted to ensure optimal drying from the drying zone. The breathability of the dryer fabrics or felt has a significant impact on the rate of evaporation of moisture. If the permeability decreases, the dryer fabrics is less capable of drying. Dryer screens with permeability in the range of 700-1000 cfm are used on paper machines to produce higher gsm kraft and paperboard grades. On the other hand 200-400 cfm dryer fabrics are widely used on medium to high-speed paper machines and below medium to high-speed paper machines on low-speed machines. A large contact area with the drying surface ensures uniform drying. Correct selection of dryers improves paper machine operation, increases drying speed, improves paper quality and saves energy.
In addition, the dryer fabrics or felt should have the following parameters or characteristics: aerodynamic properties, heat transfer, fabric tension, sheet support, thickness, heat resistance, moisture resistance, elongation by heat should be low, durability, silent drive, easy handling, etc.
