Gucheng Village is the core production area of ​​the sandstone. The enamel sand machine has a history of more than two thousand years of firing, and is the same as “Yixing Zisha”. In 2008, the handicrafts of black sand was included in the national intangible cultural heritage. Known as the “Clam Casserole”, the 荥 荥 sander is made of a clay and coal ash that is abundant in the local area and fired at a temperature of more than 1000 degrees. These sanders are simple in texture, anti-corrosion, acid and alkali resistant, can not afford chemical reactions, store foods are not easy to deteriorate, can maintain food nutrients and taste delicious, so it is widely praised.

The sand blasters are well-known, and orders from Japan, Singapore, and Taiwan are coming. Nowadays, folk crafts with novel style, elegant decoration, bright color and practical, ornamental and collection have been developed. Geographical features Located around the site of Yandao Ancient City, it is about 40 meters above the Weihe River on the third terrace of the south bank of the Weihe River. It is bordered by Zhongjun Mountain in the south, Qingxia Dam in the north, Drum Creek in the east, and a steep bank in the west. It is known as the "strategic highland" in ancient times. It has the custom of "the ancient city and the cloud smoke". In the ancient city village with a length of 900 meters and a width of 750 meters and the Xiaoping Mountain area of ​​Yandao Town in the neighboring area, it is the resource range of the main raw material clay of the sand shovel. The reserves are extremely large, and the conventional mining can reach more than one thousand years. Historical development "Yan Jing Sha" is produced in Gucheng Village, Liuhe Township. It is a black pottery dish and crafts inside and outside the world. It has a history of more than two thousand years. It was called the Yandao in ancient times. As early as the Spring and Autumn Period, it was the border trade market of the ancient Shu Kingdom. It was an important node of the South Silk Road and a military town at that time. According to the records of the "Yin Jing County", during the Neolithic period, the ancestors lived here and there, and it has been more than 2,300 years since the establishment of the county. Qin Huiwen Wang Gengyuan thirteen years (312 BC) set the county name Yandao, rule The site is located in the ancient city of Liuhe Township, and the site of Yandao Ancient City is proof. In 1982, the archaeological materials excavated by archaeologists from the Qin and Han tombs confirmed that there were sand machines produced here more than 2,000 years ago. The Qin and Hanba cultures are colorful here. The sand culture and the life of the world have lived here for generations. The children of the Bayu have jointly accumulated the Bashu civilization. The production method mainly refers to taking clay and preparing cinder; processing and crushing, the original workshop adopts the cattle-milling, water and cattle stepping, and now all are ball mill crushing and mixer stirring; the embryo is used to support the turntable, mold (or no mold) Handmade, pedals on the turntable. Molding, decaling, engraving, and unique styling are all completed in this process; drying is done with natural dryness and should not be exposed; roasting is to put the dry embryo into a special pit or kiln, usually a layer of coal The ignition is closed, and the calcination is carried out at a high temperature of 1000 degrees or more; when the furnace is discharged, the product with high temperature is put into the glazing pit to burn and glaze; finally, the furnace is cooled, and then stored in the warehouse to detect the quality classification of the finished product. The original quaint manual production has the characteristics of exquisite, unique and non-repetitive products, and it also has the characteristics of cultural relics. Moreover, it has the advantages of saving raw materials and saving resources. Product Features The sand blaster is made of high-quality clay unique to Yandao Ancient City, mixed with cinder, hand-made billet, carved (dragon, phoenix, lion, fish, orchid, bamboo, chrysanthemum, etc.), baked It is unique among earthenware vessels. The enamel sander is corrosion-resistant, non-oxidizing and non-discoloring. The stewed food does not chemically react with the acid, alkali and salt in the food, and has special functions of quality preservation, heat preservation and preservation. It is an ideal pure natural green 炊. Drinking utensils are also indispensable cooking tools in the production of Sichuan famous dish “Casserole Yayu”. The sand blasters are well-known, and orders from Japan, Singapore, and Taiwan are coming. Nowadays, folk crafts with novel style, elegant decoration, bright color and practical, ornamental and collection have been developed.

Technical requirements for the quality of sand blasters 1. Product categories, daily-use products, arts and crafts. Second, the main raw materials 1. Baishan Mu: The unique clay in Yingjing County, the iron content is 2% to 6%, it is yellowish white, the soil is fine and the viscosity is very strong. The type of ore is weathered residual clay, which is microscopic scale muddy structure and soil-like structure. 2. Third, the processing technology 1. Clay raw material processing process: raw material mining → weathering → sorting → crushing → drying. 2. (2) Ingredients → ball milling → sieving → stale → vacuum grinding → manual, mechanical forming → drying blank → decoration → polishing and polishing → firing → glazing → inspection → packaging. 3. Technical requirements: (1) Mud: It is stored in the open space of Baishan mud in the open place. It is weathered and turbid, cool and sun-dried. It is mixed in proportion with carbon and coal. It is ball milled, sifted, stale, stirred and darkened for 15 days. The obtained mud is used for grouting molding, and the mud for manual and mechanical molding needs to be vacuum-trained and aged. The fineness of the mud is selected within the range of 80, 100, 150, 200, 250 mesh sieves ≤ 1% according to the product requirements; the plasticity index of the mud is ≥ 2.5. (2) Forming: manual forming, mechanical forming or grouting. (3) Drying blank: After molding, put it in a cool and ventilated place of 8 ° C to 25 ° C to dry, avoid direct sunlight. (4) Decoration: mainly based on carving. (5) Grinding and polishing: rough grinding the surface of the dry blank surface, then grinding it with amber stick or horn piece, and then performing fine grinding. (6) Firing: The finely ground dry billet is fired in a steamed kiln at a temperature of 1200 ° C to 1300 ° C. During the firing process, the temperature rise curve, firing temperature and firing atmosphere are controlled, and the slow burning is emphasized. , the combination of three burning techniques: flat burning and fast burning. (7) Take glaze: After the embryo is fully burned, use the long rod with the top hook to pick up the reduction pit (commonly known as smoked kiln or glaze pit), add cedar branches or pine sawdust and quickly close the pit to allow high temperature. The billet is “smoldering” and a series of physical and chemical reactions occur through the “smoldering” process. After the oxide layer on the surface of the carcass is forcedly reduced under high temperature, the device is naturally cooled. (8) Release and inspection: The products after natural cooling can be discharged, and after inspection, they are stored according to the quality grade. Fourth, the quality characteristics 1. Appearance quality features: (1) Daily product category: The enamel sand machine is simple, generous and practical. The carving pattern is exquisite, non-oxidizing, non-discoloring, firm in texture, with small holes and percussive sound The metallic luster is soft and the color is soft. (2) Arts and crafts categories: antique, solid texture, percussion sound, soft and soft color, decorative and finely carved. 2. 2 water absorption rate: water absorption rate ≤ 16%. 3 Lead and cadmium dissolution on the contact surface with food: lead ≤0.5mg/L, cadmium ≤0.05mg/L. 4 Leakage: The graded product does not form a water polo at the bottom after half an hour of water in the glazing range. 5 Appearance quality: smooth glaze, no obvious network cracks. (2) Arts and crafts categories: There is no requirement for the above physical and chemical indicators such as thermal stability, lead and cadmium dissolution. 3. Safety and other quality technical requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

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The producers within the scope of the sand-sanding device can submit an application for the use of the “Special Mark for Geographical Indication Products” to the Quality and Technical Supervision Bureau of Yingjing County of Sichuan Province, which is reviewed by the Sichuan Provincial Bureau of Quality and Technical Supervision and submitted to the General Administration of Quality Supervision, Inspection and Quarantine for approval. announcement.