Overview of HHH Nylon mesh filter bag
Boulting cloth was an extremely, hard material of even weave, originally of linen or cotton, and from the end of the 18th century silk mesh which was as fine as one hundred treads to the inch. Agitation of the boulter screen would the finer particles of flour to though the cloth, which over tailed the courser materials. The problem with using linen or cotton, the ground material would give it rough treatment, and would soon wear out. So they looked for a stronger material. About the time the Pilgrims were struggling to build Plymouth Plantation, patents were issued in Great Britain for the making of woven wire cloth. Then about 100 years later, a Scot named John Milne, invented a sifting reel that rotated instead of being shaken. Even though this was a great breakthrough, at first the reel was hand-cranked, or rotated by hand. The ground material would be poured into a hopper at the head of the reel where it gradually feed into the revolving reel. These reels could be 12 to 14 feet in length, and the over tails were discarded out of the mill. In the end of the century the reels were mill powered by cogs, and then later by flat leather belting which greatly improved the constantly of the flour sifted though the screens by wooden chutes rather than feed hoppers.
Advanctages of HHH Nylon Flour Bolting Cloth
We produce variouse of polyesters mesh, nylon mesh and some other stainless steel mesh for printing and filtering. Our products are widely applied in high-density printed circuit boards, CDs, keyboard, ceramics, printing of T-shirt textiles, printing on glasses, and adadvertisement signpost making etc.They also serve as filter in aerospace, petrifaction and other high technology regime.
1)Material: 100% nylon (polyester available if needed)
2)Weaving: Plain weave (Twill weave available if needed)
3)Mesh Count: 4T~140T mesh/cm(13mesh~355 mesh/inch)
4)Max. width: 365cm (143 inch)
5)Color: white/yellow/black
Application of Nylon Flour Bolting Cloth
During the period of the 1600's to the 1900's, the bolting or sifting surfaces changed and evolved. There were three basic beginning of bolting or sifting in the 1600's.
(1) The basic method of sifting was with a "temse" a round flat sieve. These hand operated sifters were made from two to three feet in diameter. A miller would use them to sift material from one bin to another. They could be used to sift ground meal or chop from a sack into a box, pail or tub placed on a table. A sifting operation would have a series of different "temse" with various mesh openings to sift out fine to course materials. They would start with the finest mesh and sift out the finest flour first, and the material not passing though that mesh openings would be sifted though a larger mesh screen on another "temse."
(2) Another method of sifting or bolting flour was called, "flogging." You collect the flour as it comes down from the chute from the millstones into a sack. The sack would only be allowed to become partly filled. The sack would be "flogged," or beaten against a table surface. The finer flour would be "flogged," though the mesh of the weave of the sack, and the courser particles would remain in the sack so they could be discarded. During the 1600's and 1700's the floor was an acceptable place to store grain and flour.
(3) The German method if sifting was "sock" or "tube milling." Rather than a wooden square chute being attached to one side of the millstone cover a long round sock or tube was attached to the millstone cover, and the other end (the collar) was attached to an outside wall of the mill. As the ground material pass from the millstones down the sock, the miller's helper stood in the mill basement hitting the sock with a stick. The flour would come though the weave of the sock, and the courser material would remain inside of the sock to be deposited in the mill stream outside of the mill. During the 1800's an eccentric was used to shake the sock with a stick so the miller's helper would be eliminated and the system be some what automatic.
(4) Another system used on the European Continent was a slanting flat mesh screen (of either single mesh or several mesh openings) which was hand-agitated by the miller's helper, or the boulter. The ground flour was collected in a sack and dumped into a hopper at the head of the device, and from the bottom the ground material was gradually fed onto a moving flat screen. The hand-agitation was accomplished by a hand-crank.