Ironing Problems Caused by Ironing Problems A well-designed washing process can rinse alkali and other detergents from the cotton item quite thoroughly to avoid the tendency of the linen to turn yellow during the ironing period. At the end of the last rinse, the alkalinity should be no more than 0 per liter04 grams, higher than the alkalinity of the softened water. Even after a thorough rinse, more than 0The alkalinity of 2 grams of raw water will still cause yellow spots or traces of brown spots to appear during scalding. The dehydration phase is even more important. A new elution machine can reduce residual moisture to less than 54% depending on the dry weight, and a high-quality press dehydrator should do the same. Extrusion or centrifugal dehydration of water is several times cheaper than drying water in a dryer or blanching it on an ironing machine. For polyester or polyester-cotton detergents, it is also important to design this process to avoid creases on the edges. This requires attention to the selection of the machine, the loading factors, the cooling rate, and the G-factor (dehydration force) at the time of dewatering. High-quality ironing is only possible if washing and dewatering are done correctly. It doesn't make sense to waste time on ironing machines because of these problems caused by incorrect washing methods. 02 Ironing problemsIroning problems caused by steam quality A new ironing machine needs to supply enough dry steam at normal pressure through a suitably sized conduit. The water droplets in the steam form an insulating covering at the bottom of the ironer's ironing machine that effectively slows down heat transfer. If water droplets are carried from the boiler, then the water droplets are likely to contain solid contaminants that clump together into an insulating scale, which makes the problem worse. Any ironer experiencing this type of problem should have a water separator installed on the steam supply pipe connected to the ironer itself. The steam inevitably contains gases dissolved in the boiler feed water. These gases must be discharged from the angular holes in the ironing machine through properly sized and properly installed exhaust valves. A good quality steam trap under each ironing bed will also have a proper exhaust device. Choosing the right trap is critical. An ironing machine needs to have a steam trap that can drain condensate at the same rate as condensate formation, so that there is no water accumulation in the ironing bed, condensation points and localized moisture on the linen. A floating valve with an exhaust port with automatic temperature adjustment or a reverse float condensing valve can do the job well. It is feasible to invest in a floating valve equipped with a steam locking pin trip, which is even more beneficial if the ironer is running at full speed all day. Whenever a temporary vapor mass is blocked, a vapor locking pin trips to prevent a temporary blockage of the condensate drain.
03 Ironing issues.
Scalding problems caused by the maintenance of the drum and the exhaust system The water vapor generated by the flattening linen should be absorbed through the porous ironing felt and then discharged into the atmosphere by the exhaust and humidification fan. If the exhaust fan is not switched off during daily waxing, the wax and wax vapor will be drawn into the felt and exhaust system, causing the system to become completely clogged quickly. If the ironer rollers are new, they are equipped with an elastic device (spring) designed to flatten wet linen by allowing the elastic ironing felt to fit snugly against the heated ironing machine. When springs become old, less elastic, deformed, or even unusable, they are no longer functioning properly and must be replaced regularly. As the first vendor of new elastomeric units often points out, this update can have a very incredible effect on an old ironing machine. It is important to replace the felt itself so that the diameter of each drum is precisely appropriate. If the ironing machine is new, it will be equipped with a special metal measuring ruler marked with two imprints. Equip the right cylinder with the right measuring ruler and use the measuring ruler to circle the drum so that the two impressions can be arranged to the millimeter. If they do not match, then there is a problem with the thickness of the iron felt used and must be replaced. The small size of the drum does not properly dewet the linen and often causes the linen to wrinkle at the first drum of the feed. Oversized drums can create unsightly creases and have a poor dehumidification effect. 04 Ironing problemIroning problem caused by speed control The linear speed of each drum of the ironing machine is different. This creates a slight stretch as the linen passes through the ironing machine. In general, for a drum with a diameter of 800mm, there should be such a speed difference that produces a total stretch of 50mm in 10 rounds. For similar reasons, the infeed conveyor is usually running at a lower speed than the drum speed (about 10% lower than normal), while the folding machine is running at a slightly higher speed than the drum speed. That's why it's so important to feed edge-to-edge (i.e. the front edge of the latter sheet aligns or slightly overlaps the back edge of the previous sheet), because even then, when the linen reaches the last roller, a small gap is created.