Sometimes people want to know if the quality and price are one price and one price, is it not that good goods are not cheap, and cheap is not good. Looking at the price of grass planting bricks sold now, the cheapest grass planting bricks are now 30 yuan per square meter, the highest is 60 yuan per square meter. Is such an expensive grass planting brick really the price? Is there any quality problem?
In addition, the grass planting bricks produced by regular manufacturers are made according to a certain proportion of materials and sintered at high temperature. The brick body is firm and dense without cracks and holes. In particular, some unscrupulous manufacturers often do their hands and feet on the packaging, placing good quality bricks on the outside of the tray, and poor quality bricks on the tray. This point must pay more attention to prevent the planting bricks from being sent to the construction site to open the packaging, but the gap is too large, causing great loss.
As a well-known plant for planting grass bricks in Guangzhou, the period from March to October is normally the most urgent time period for selling grass planting bricks, and it is also the peak season for manufacturers to sell. Many unscrupulous manufacturers are not swept away. Through this construction peak season, they will take advantage of the opportunity to raise prices and cover the market for resale.
Therefore, when buying grass planting bricks, when buying goods, you must shop around. Do not buy impulsively, especially when you buy a formal purchase contract in advance to prevent quality problems. Stomata may appear during the production of grass planting bricks. To solve this problem, we need to understand its porosity. For how to reduce the porosity of grass planting bricks, we will briefly introduce it below.
1. During the firing process, the temperature is generally controlled between 1350 ° C and 1380 ° C. The firing temperature of low porosity clay bricks is appropriately increased (1420 ° C), and the grass planting bricks are shortened and added slightly, so that the density of the refractory bricks is slightly added and the porosity is low To fall.
2. Dosing according to the required particle size. After molding and drying, it is fired at a high temperature of 1300 to 1400 ° C.
3. Selecting raw materials with high fine density and low water absorption, and reasonable grading is the key to making low porosity grass planting bricks. The so-called cooling method refers to the cooling rate and the related temperature of the grass brick after burning. Depending on the speed of cooling, the following three methods of cooling can be taken.
1.Insulation slow cooling
According to the structure and heat capacity of the kiln, a small amount of heating and slow cooling can be selected to make the furnace temperature drop slowly at a slower rate. This method is suitable for products with large grass planting bricks, disordered structure, large linear expansion coefficient, or polycrystalline transformation during the cooling period. For small grass bricks, it is not necessary to do so to prevent power and delay the production cycle.
2.Cooling with furnace
After the insulation is completed, the power can be blocked to allow the planting bricks to cool naturally. When the temperature drops to about 200 degrees, the furnace can be turned on. This operation is simple and convenient, and the labor intensity is low. It is the most commonly used method for grass planting bricks without special requirements in general, especially the grass planting bricks produced by small furnaces. For large furnaces, the heat capacity is too large and the natural heat dissipation process is slow. In order to shorten the production cycle, a ventilation and heat dissipation method must be adopted appropriately.
3, quenching and cold
This method of cooling was chosen because of the structural and performance requirements of the grass planting bricks. According to need and possibility, quenching in water, quenching in oil, quenching of inorganic powders such as asbestos, blast cooling or air quenching can be selected.