| e9ukzruzxi | Date: Marti, 2014-02-25, 9:46 AM | Message # 1 |
|
General
Group: Utilizatori
Messages: 2770
Status: Offline
| Processing Timber
Before we dive on the milling process, perhaps it will assist to take a closer look at the structure of wood. We mentioned earlier that wood involves cells. Why don't we get additional specific. Waterconducting cells are classified as the key blocks of one's sort of tissue identified as xylem. These cells are long and hollow, like pipes, leading them to ideal transport systems to haul water from your roots to the top level within the tree. Sugarconducting cells happen to be beyond the xylem. They form a minute kind of tissue named phloem, which functions to cart sugars and also other nutrients within the leaves on the leftover plant.Somewhere between the xylem and phloem lies cambium, a thin layer of stem cells. Cambium generates new xylem cells in to the inside, new phloem cells towards you. As new xylem and phloem cells are added, the tree grows thicker. Which means the xylem nearest to the center of a trunk will be the oldest aspect of the tree. It's the heartwood, or maybe the section of a tree defining it as so strong. The newer xylem, which lies just within the cambium but still functions to transport water, is sapwood. From the cambium certainly is the bark. Bark contains new phloem cells and, around the very periphery, older phloem cells that become crushed as new tissue is laid up to the interior.The heartwood and sapwood are the most useful elements of a tree and is turned into paper, lumber, veneers and plywood. Bark may not be which is used to make paper or lumber, while it may be used for fuel and mulch. So, the 1st step in processing timber is separating the bark in the main aspect of the <a href=http://addonix.com/intranet/default.asp?q=538>http://addonix.com/intranet/default.asp?q=538</a> trunk. Logs are undergone a considerable, openended cylinder booked a debarking drum. Contained in the drum, logs spin and rub against each other well until each of the bark is removed.A debarked log could be sent instantly to the chipper if it's <a href=http://www.winjit.com/mailer/global.asp?q=747>http://www.winjit.com/mailer/global.asp?q=747</a> going to become paper. The chipper cuts down on the log into small squares a couple of inches (5 cm) on them and 0.25 inches (0.6 cm) thick. Then this chips are together strong chemicals and heated in big pressure cookers also known as digesters. Digesting separates the cellulose fibers in the lignin. The soft, wet fibers, now identified as pulp, are blown within the digesters, washed and bleached to the proper shade of whiteness. From edinburgh, <a href=http://addonix.com/intranet/default.asp?q=539>アグ クラシックミニ</a> the fibers are together water again and formed into large mats of pulp. These mats enter a number of rollers and presses that flatten the pulp into sheets and extract water. Finally, a starch option would be put into all parties just before the final drying process.Highergrade logs don't look at the chipper, but in the sawmill. One log can become a variety of boards, planks and beams. The main saw connected with a mill, the pinnacle rig, metabolizes the log into nearly every one of its roughcut pieces. Heartwood, as it is much older, often has more knots and is also typically for heavier planks or rectangular beams. Sapwood contains fewer knots that is an excellent option for a total variety boards and planks. As soon as the head rig lessens the log, every piece of lumber goes through an edger, which removes irregular edges and defects, and be able to by way of a trimmer, which squares from the ends at standard lumber lengths. Finally, the lumber is sorted, stacked and dried in kilns.
[url=http://www.ruraluniv.ac.in/logs/rayban.html]レイバン コックピット[/url]
|
| |
| |
