In recent years, sodium carboxymethyl cellulose has developed significantly in quality, yield, variety, and technology, and its use has gradually been promoted. For example, replacing high-quality starch with increasing flexibility and smoothness is beneficial to printing and dyeing in the textile industry. Adding in the washing industry and cosmetics industry can improve the stability of the foam, as well as the adsorption of dirt, and improve the cleaning efficiency. In the oil drilling industry, to reinforce the borehole wall. In food, it can increase the consistency of lactic acid beverages and improve the taste. The calcium salt of sodium carboxymethyl cellulose is a disintegrating agent for instant coffee, instant soy milk, etc.
The traditional production process of sodium carboxymethyl cellulose is that fine cotton undergoes alkalization to produce alkali cellulose and then etherification to produce sodium carboxymethyl cellulose. The most basic raw material is refined cotton, also known as absorbent cotton or pulp (PS: now to reduce production costs, wood pulp is also used). Almost pure natural cellulose requires 35%-40% of methylcellulose if the fiber staple mixed with part of the long lint is not a problem. On the contrary, with selected pure staple as raw material, the viscosity of the finished product is not necessarily high because the raw material will be mixed with more immature cellulose. And, refined cotton should be careful to prevent polyester and other chemical fibers mixed in.
Semi-metallic gaskets such as Spiral Wound fall between these two general types. The reason for the difference is that with non-metallic gaskets such as rubber, there must be sufficient roughness on the gasket seating surfaces to bite into the gasket thereby preventing excessive extrusion and increasing resistance to gasket blowout. In the case of solid metal gaskets, extremely high unit loads are required to flow the gasket into imperfections on the gasket seating surfaces. This requires that the gasket seating surfaces be as smooth as possible to ensure an effective seal.
