Inventory of several advantages of film coated sand

Film coated sand has a wide range of applications, and we definitely need to know its characteristics before using it. So that we can better apply it. If you are interested in this topic then take a look at it, I hope to bring help to some people concerned.

Film coated sand is widely used in all kinds of industries, so its use is still very wide. In many industries can also be seen in its figure. And coated sand also has the strength properties that are compatible with the real thing. Both can be made of high-strength shell core coated sand, and can be made of medium-strength hot core coated sand and low-strength non-ferrous coated sand, sand. Especially its mobility is also better, the production of the casting core contour is clearer, dense structure, can produce complex sand core, such as cylinder water jacket core, cylinder head, etc.. The sand core coated sand produced by the casting manufacturer has stronger moisture resistance and longer storage time, which is more conducive to transport, storage and use. If the sand core is made of film-coated sand, with less or no film coating, it can obtain better surface quality of castings, with surface roughness up to Ra=6.3~12.5um and dimensional accuracy up to CT7~CT9 grade. As a company engaged in the casting industry, we keep innovating, developing new products and overcoming problems to make our products better. Only in this way, customers can be assured to give us their products and trust us.

Coated sand is made by heating the metal template or base box to a set temperature so that the resin in the coated sand is softened, melted and hardened by heat. Therefore, the cladding sand process uses metal type, which consumes a lot of energy, adds a lot of resin, and costs a good deal; the process of mixing sand is more complicated, and you will find that it actually produces formaldehyde and. another gas during moulding and pouring, making large parts difficult to handle. In addition, if the cladding sand is not prepared or selected correctly during the production process, some of the layers of the shell shell will fall off, resulting in shell dissolution or sand entrapment defects in the casting. In addition, the crust speed of this film coated sand is controlled by hexamethylene tetramine (content 10%-15%), less than 10% (of the amount of resin) crust speed is slow, and if it is higher than. 15%, the crust speed is irrelevant. In conventional resins, the phenol nucleus has a high number of active hydrogen atoms in the para or neighbouring positions, or a moderate amount of water, which facilitates the formation of methylene. In order to accelerate the bonding of methylene groups, it is of course necessary here to address the molecular weight distribution of the resin, i.e., to configure the right amount of polymer and low molecular resins. Cross-linking turns the resin from a thermoplastic into a hard solid. The overlying cured sand is very strong. Tensile strength is an important index to detect how fast or slow the overlay sand crusts.

The above article content is for all of you friends about the advantages of sand covering, but also shared in the content of a better manufacturer, if you have the needs in this area can go to check out, I hope to be able to bring you help it.