Cork, commonly known as cork, is the outer skin stripped from cork oak trees. It is light and flexible, and it is impervious to water, airtight, slow in heat transfer, resistant to friction, corrosion and sound absorption. Can be made into a variety of cork products, such as cork refrigerated bricks, cork paper, cork, etc., can also be made of marine buoys, life jackets, lifebuoys, waterproof linoleum, high-grade rubber flooring, shock pads, sound insulation panels and insulation pipes.
First, the cork tree species: China's production of cork tree species, mainly cork oak. Quercus variabilis is a deciduous tree with a height of 25 meters and a breast diameter of more than 1 meter. The main root is developed and adaptable. It is suitable for growing in the soil and moist and deep sand belt. Quercus variabilis is widely distributed in China, and is distributed in all provinces and autonomous regions of the Yellow River, Yangtze River and Xijiang River Basin. The cork of the cork oak is more developed, with a thickness of 10-50 mm and a maximum thickness of 80-100 mm. It is the best cork oak species in China.
Second, cork peeling: Cork oak grows to 20 years, breast diameter up to 15 cm, cork thickness 10 mm or more, you can start peeling cork. After the cork on the trunk is peeled off, a regenerated high-quality cork with no cracks and a uniform thickness can be grown. The cork is usually peeled off from May to September, but it is best for three months of 6, 7 and 8 because the three months are vigorous, the water is sufficient, the sap flows quickly, and the cork is most easily peeled off from the phloem. If the stripping is too early and too late, the cork is not easy to peel off. The peeling and peeling tool is simpler, and the main tool is a dual-purpose saw. When peeling, the root of the cork oak tree is 15 cm high to prevent the pests from invading the trees. Use a dual-purpose saw to cross-cut a pair of circular circles around the trunk. At 115 cm from the ground, saw a pair of mouth circles. Between the upper and lower circles, use a saw to cut a slit from top to bottom and use a hardwood wedge or iron shovel. Peel the skin, so that the inner and outer skins are separated, so that the skin is peeled off while the skin is peeled off. In the same way, it can be peeled off year by year and peeled until the branches of the trunk, but it is also desirable to have a cork of 10 mm or more.
At present, stripping is carried out in most areas, that is, all the cork from the ground above 15 cm to the trunk and the big branches are stripped off. As long as the phloem is not peeled, no adverse effects have been found on the growth of the trees. The cork peel that was peeled off for the first time was a primary cork with uneven surface and deep grooves. After the cork is peeled off, a new cork can be grown on the bast, that is, the cork is regenerated. The regenerated cork is smooth and crack-free, and the quality is better than that of the primary skin. After the cork peel is removed, the thickness of the cork to be regenerated is longer than 10 mm (10 or more years for cork oak), and the cork can be peeled off again. In this way, until the tree ages and declines, it is generally possible to peel the cork for about 10 times. Take the peeled cork, brush the surface of the moss, impurities, dampness and spread, vertical and horizontal, staggered 15-20 layers, laminate the heavy objects for 3 days, then put the flattened cork in the open air After 6 days, it is the finished product. After grading and packaging, store it in a dry and ventilated place.
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