There are special instruments internal stress can be measured . Glass , plastic and other more internal stress meter Photoelastic measurement principle .
Somewhat rare for more than expertise and shoved all of a sudden can not read it does not matter , we asked the Japanese glass Co., Ltd. Hangzhou Zhenhua the veterans Xiaxiong Feng , popular explanation of this matter .
The company is located in Yuhang Pingyao , specialized in producing glass bottles , annual output more than 8000 million , of which 80 % of perfume bottles, all exported to France, Italy , Britain and other European countries.
Summer always said , from their factory out of the perfume bottle , the possibility of an explosion will not occur .
Why in summer the total self-confidence, because their mechanical strength of glass after two tests , one is the hot and cold blast crisis , one is to eliminate internal stress .
Hot and cold blast crisis , is equivalent to the bottle in boiling water from 100 degrees out immediately after the ice water at 0 degrees Celsius , the glass will not be bursting . Do this , need a good raw material formulations and professional process .
Elimination of internal stress on the glass manufacturers in the production process, while efforts to improve the uniformity of thickness of glass bottle ; the other hand, using equipment to eliminate the stress of glass bottles .