Automatic Dona Cup Plate Machine

Paper machines usually have at least five distinct operational sections: Forming section, commonly called the wet end, is a continuous rotating wire mesh which removes water from the paper by sucking it out of suspension via vacuum. Press section, where the wet fibre web passes between large rolls loaded under high pressure to squeeze out as much water as possible. Drying section, where the pressed sheet passes partly around, in a serpentine manner, a series of steam heated drying cylinders. Drying removes the water content down to a level of about 6%, where it will remain at typical indoor atmospheric conditions. Infra-red driers are also used to supplement cylinder drying where required. Size Press section, where the semi-dried paper is applied with a thin layer of starch and/ or other chemicals to improve several paper properties, reduce dusting and air permeability, increase stiffness, bursting strength and short span compression Calender section, where the dried paper is smoothened under high loading and pressure. Only one nip (where the sheet is pressed between two rolls) is necessary in order to hold the sheet, which shrinks through the drying section and is held in tension between the press section (or breaker stack if used) and the calender. Extra nips give more smoothing, but at some expense to paper strength. The calendar section can either be a part of the machine (On-line) or in a separate part of the paper mill (Off-line). Reel section, where paper coming out of the machine is wound onto individual spools for further processing.