The quality management of the Curve Tempered Glass is enhanced
Improve the quality of the Curve Tempered Glass from the process to strengthen the glass in the production process, must be heated to the corresponding temperature, and the glass surface of the various parts of the temperature should be uniform, the difference can not be too much, in order to control this data Have to master the following points:
First, a reasonable heating time. The heating power of the tempered furnace is constant. The heating time is usually set to about 35 to 40 seconds per mm of glass. For example, the heating time of 6mm glass is about 6 × 38 seconds = 228 seconds. In the thickness of less than 12mm ordinary Curve Tempered Glass, when the glass thickness of 12 ~ 19mm, the heating time of the basic calculation method is about 1mm thickness of glass about 40 to 45 seconds.
Second, according to the load of the furnace, select a reasonable heating temperature and effectively control the furnace temperature. The success of glass tempered depends mainly on the lowest temperature of the glass plate, once the electric furnace has an overload phenomenon, the furnace temperature will drop, resulting in glass cooling in the cooling section caused by broken. The heating of the glass in the tempering furnace is mainly conduction, radiation and convection. Here, the electric furnace load does not refer to the area occupied by the glass in the electric furnace, but the relationship between the glass thickness, the heating temperature and the heating time. At present, most manufacturers use the steel furnace heating section can generally be divided into many very small heating area, under normal circumstances, in the central heating element heating area, there are always glass in the endothermic, in the electric furnace area, has been There is a glass, which is regional, the heating effect is also regional, if the electric furnace within a region of the heat consumption exceeds the heating effect, the temperature inside the region began to decline, which is overload phenomenon.
Third, the curve of glass heating evenly, the arrangement of glass in the release stage is also very important. The rational arrangement of the film is to ensure the uniformity of the longitudinal and transverse loads in the furnace, that is, the arrangement of the furnaces and the gap time of each furnace should be uniform.
In the master of the above three elements on the basis of the glass as much as possible to the fastest cooling rate of cooling, cooling rate depends on the glass thickness and other properties of the glass, glass positive and negative cooling to be balanced; Of the ideal cooling medium is dry cold air, the cooling capacity per unit area is determined, so 5mm glass cooling capacity required equivalent to more than twice the 6mm glass.
Finally, the curve of Curve Tempered Glass in the production process of glass to keep moving, the glass surface can not have scratches and deformation left traces. This movement includes the curve of the Curve Tempered Glass in the heating furnace in the hot pendulum movement, the hot pendulum movement is to make the glass surface of the various parts of the heating evenly; also includes the glass in the air-cooled section of the cold pendulum movement to ensure that the glass pieces of uniform The The original piece of glass can not have scratches, bubbles, etc., these conditions can cause glass broken.
Since the beginning of 2015, the curve of Curve Tempered Glass market started mediocre, the market price of low volatility, upstream difficulties, flat Curve Tempered Glass industry is difficult to glory, the excess curve of glass production capacity and relatively sluggish downstream demand situation collision, combined with the country on the flat Curve Tempered Glass industry, the intensity of control has been strengthened, the cracks in the curve of glass enterprises are facing a major test.
From the supply side, the curve of glass enterprises to expand the blind expansion of production capacity, the market is difficult to digest. As a source of energy and resource consumption, flattened glass Curve Tempered Glass production is strong, production capacity control is relatively difficult, while the production process will discharge soot, a lot of sulfur dioxide and nitrogen oxides and other pollutants, have a significant impact on the environment. In recent years, thanks to the national key development of infrastructure construction, as an important building materials building materials, flat Curve Tempered Glass industry was rapid development trend, in mid-2014 to reach the peak production capacity of 16.198 million tons, an increase of 14.94. In 2015, due to the overall market overcapacity, increasing competition in the enterprise pressure, only the first four months of the cumulative production line up to 14 cold, re-production and new ignition 10, Nissan net reduction of 2,100 tons, although the overall capacity of compression , But still difficult to alleviate the current industry overcapacity problem.
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