The current global economic situation is very serious. It can be confirmed that the global economic recession triggered by the international financial crisis will be long-term. The influence of this international situation has also affected the global plastics industry, resulting in a general slump in the press market. While the general public believes that the plastic market is about to fall into the deep valley, many international large-scale presses have expressed their opinions and are optimistic about the plastics market under the economic recession. At present, as the global plastic market recovers gradually in 2010, a large percentage of plastics companies have been bullish on the plastics machinery industry. According to statistics, in 2010, the total export volume of plastic machinery in Europe reached 703 million euros, an increase of 23.9% over the same period in 2009. We concluded that the 2011 North American squeeze out of a diversified market indicates that although the economic recession has caused some products to weaken the demand for plastic materials, the outlook for the building materials market is still optimistic. Blank flange is the same to Blind Flange, usually ANSI (ASME) B16.5, BS4504 and SANS1123 flanges standard called blind flange type to blank flange, DIN EN1092-1 UNI GOST33259 and JIS B2220 usually call blind flange but BS4504, ANSI B16.5 and SANS1123 called blank flange, blank flange also have RF FF and RTJ facing type. Blank Flange, Blank Flange Raised Face, Blank Flange Flat Face, BLRF BLFF, ANSI BLANK FLANGE Jinan Hyupshin Flanges Co., Ltd , https://www.iflange.com