Internal quality standards for domestic process boards Shaanxi Zhenping County Hongli Mining Co., Ltd. 1. Board surface: The surface of the slate as a natural stone has a slight chromatic aberration and sporadic small point sulphur iron spots and water extraction lines are normal. The surface of the board is required to be flat, and there must be no bent plates or slabs, and there must be no broken white gold wire and sand-sanding lines, water-drawing lines and penetrating smelting pyrite or depressions or bulges. There must be no penetrating cracks inside;
Shaanxi Hongli Mining Co., Ltd.1. Board surface: The surface of the slate as a natural stone has a slight chromatic aberration and a point of sulphur iron point, water extraction, sand layer and platinum line are normal, but there is no broken sand layer and platinum line. The surface of the board is generally flat and must not have large bismuth pyrite or large areas of depressions or bulges. It must be guaranteed that the four corners of a face are complete.
The internal quality control and management system is very important and plays a key role in ensuring the company's entire production and operation system. For natural stone such as slate, there are various natural defects such as chromatic aberration, water extraction, sand layer, platinum wire, sulphur iron point and bump. Because of the different uses, customer needs and quality requirements are also different. In addition, long-distance transportation is likely to cause bumps and breakage, which may lead to disputes in production, processing, packing, and delivery. Internal quality control and management is to avoid disputes, improve quality, and make the company embark on a sound development path. The entire quality control and management is not isolated. It must be carried out in every aspect of production: material selection, cutting, splitting, selection, (paneling, edge-cutting, drilling) packing, shipping and delivery.
1. Board quality and color difference: The block material must be the fine quality of the stone pier which is cut off at least 5 cm of the oxidized skin. The designated material of the tile mining site is divided into blocks and stone piers of different mining periods. Slate can not be mixed. 2. The surface of the board is required to be flat, and there must be no curved plates or rocking plates. There must be no platinum wire, sand wire, water ripple and penetrating pyrite. 3. There shall be no internal cracks and penetrating cracks; 4. Angle tolerance: four angles of 90°, the angle error on the long side is within 1°, and the angle error on the wide side is within 0.5°; 5. Size error: length and width error: +1mm - 0mm, 6. Thickness: between 5-7mm: