Food Partner Network: Recently, the Washington Post organized a reader survey: “The U.S. Food and Drug Administration is considering the approval of genetically modified catfish for human consumption. This highly anticipated decision sparked debate over potential risks to consumers and the environment. If the commercialization of genetically modified salmon is approved by the FDA, will you buy it?"
For this survey, 17% of readers expressed support for genetically modified salmon, because we have already eaten transgenic crops such as corn and soybeans. In addition, less than 10% of people need to make further decisions after further studying their potential health and environmental hazards. The vast majority of people who achieved 78% refused because of the potential risk of genetically modified salmon.
Food Partner Network was informed that the US FDA will hold a public meeting on the commercialization of genetically modified carp from September 19th to 21st. If the product is used for food to win approval, it will be interviewed in about 3 years.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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