At present, there are many things that need to be spent on wedding affairs. Wedding rings, banquets, dresses, etc. all have a lot of expenses. When newcomers buy wedding diamond rings, it is an indispensable part of the evaluation of diamond rings. To accurately evaluate the diamond ring, it is necessary to carry out the diamond, the setting, the processing fee and the brand added value. Below we will explain separately. diamond Diamonds are the most important factor in the valuation of diamond rings. Diamonds are called loose diamonds before being placed on the ring. The price of loose diamonds is determined by the internationally accepted diamond 4C standard. At present, the loose diamonds are relatively transparent. The diamonds are evaluated for quality by carat, color, cut, and clarity. The same weight of diamonds The price will be totally different. Setting The ring of the diamond ring is usually made of 18K gold, gold and platinum. These three metals are very popular. Among them, platinum is the most expensive metal, it is a natural metal itself, the natural luster can bring out the unique radiance of diamonds, coupled with excellent durability and low sensitization, making platinum the most commonly used diamond ring. Metal. Processing fee After picking the loose diamonds and selecting the setting, the diamond ring will not be completed, and finally the stage of making the finished product. In the process of making a diamond ring, there will naturally be a processing fee, and some special unique design styles may have more processing fees. Don't forget this when making a diamond ring valuation. Brand added value The quality of the diamond rings is the same, and the diamonds are equally large. Because of the brand effect, the price difference is also very surprising. It’s hard to buy a diamond ring that doesn’t buy a big brand. This is the last factor we need to consider when evaluating a diamond ring. For more jewellery knowledge, please pay more attention to China Jewelry Merchants Network. Nylon is a generic designation for a family of synthetic polymers, based on aliphatic or semi-aromatic polyamides. Nylon is a thermoplastic silky material[1] that can be melt-processed into fibers, films, or shapes.[2]:2 It is made of repeating units linked by amide links[3] similar to the peptide bonds in proteins. Nylon polymers can be mixed with a wide variety of additives to achieve many different property variations. Nylon polymers have found significant commercial applications in fabric and fibers (apparel, flooring and rubber reinforcement), in shapes (molded parts for cars, electrical equipment, etc.), and in films (mostly for food packaging).[4] Nylon Fabric Shaoxing Yingcai Textiles Co.,Ltd , https://www.blg-yc.com.jpg)
Nylon was the first commercially successful synthetic thermoplastic polymer.[5] DuPont began its research project in 1927.[6] The first example of nylon (nylon 6,6) using diamines on February 28, 1935, by Wallace Hume Carothers at DuPont's research facility at the DuPont Experimental Station.[7][8] In response to Carothers' work, Paul Schlack at IG Farben developed nylon 6, a different molecule based on caprolactam, on January 29, 1938.[9]:10[10]
Nylon was first used commercially in a nylon-bristled toothbrush in 1938,[11][12] followed more famously in women's stockings or "nylons" which were shown at the 1939 New York World's Fair and first sold commercially in 1940.[13] During World War II, almost all nylon production was diverted to the military for use in parachutes and parachute cord. Wartime uses of nylon and other plastics greatly increased the market for the new materials.[14]