Variations of the fourdrinier machine forming section

webadmin — Thu, 07 May 2015 08:43:35 +0000

The forming section type is usually based on the grade of paper or paperboard being produced; however, many older machines use a less than optimum design. Older machines can be upgraded to include more appropriate forming sections.A second headbox may be added to a conventional fourdrinier to put a different fibre blend on top of a base layer. A secondary headbox is normally located at a point where the base sheet is completely drained. This is not considered a separate ply because the water action does a good job of intermixing the fibers of the top and bottom layer. Secondary headboxes are common on linerboard.
A modification to the basic fourdrinier table by adding a second wire on top of the drainage table is known as a top wire former. The bottom and top wires converge and some drainage is up through the top wire. A top wire improves formation and also gives more drainage, which is useful for machines that have been sped up.The Twin Wire Machine or Gap former uses two vertical wires in the forming section, thereby increasing the dewatering rate of the fiber slurry while also giving uniform two sidedness.
There are also machines with entire fourdrinier sections mounted above a traditional fourdrinier. This allows making multi-layer paper with special characteristics. These are called top fourdriniers and they make multi-ply paper or paperboard. Commoly this is used for making a top layer of bleached fiber to go over an unbleached layer.

China Leading PAPER MACHINE manufacturer,stock preparation equipments,cylinder mould paper machine,fourdrinier paper machine,paper making machine,toilet paper machine, toilet tissue paper making machine,corrugated paper machine, A4 copy paper machine,Kraft paper machine, writing paper machine,printing paper machine,etc

About fourdrinier machine

webadmin — Sat, 07 Oct 2006 08:17:53 +0000

Fourdrinier machine is currently the most widely used as a paper machine. Fourdrinier machine’s high production efficiency, product quality, can produce a variety of paper and cardboard. Small-scale Fourdrinier paper machine and noisy thin Fourdrinier only a few tons per day, while the largest long-net paper machine the amount of daily production capacity of paper up to 1200t, and thus applies to all sizes and types of the paper mill.
Modern long-net paper machine is toward large-scale, high-speed direction. The world’s most wide Fourdrinier machine, pieces of the door of more than 10m, speed of up to 2000m/min. Overseas production of the paper industry in developed countries the main species, such as newsprint, sack and so on with large-scale, long-net paper machine made copy. Fourdrinier machine is a complex structure of the joint work machine, it is a complete embodiment of the entire papermaking process, process principle.

Fourdrinier machine – Paper machinery-paper making machine,paper manufacturing machinery

Variations of the fourdrinier machine forming section

About fourdrinier machine