This model is made up of

Pouring: 1. Outer mold (made of rubber, wood board, plastic, etc.). ), then the gypsum is mixed into slurry and poured, and the mold is removed and trimmed after being semi-dry.

Cutting: First, according to the above method, cast a gypsum block with a basic shape, and then cut it into the required model with a knife as needed. You can also divide the basic body into several simple geometric bodies first, and then paste, cut, line, polish and color them. (The paste is also bonded with gypsum paste.)

Preparation of gypsum slurry: first put half a bowl of water in the container, then sprinkle gypsum powder by hand, spread it evenly and sink without caking. And then uniformly stir with chopsticks to prepare slurry. Remove lumps and bubbles. Make it thin, not too thick, and it will dry quickly. This depends on experience and try it several times. When pouring into the model, every part should be in place, roll and shake hard, and don't leave bubbles or empty tips on the surface. If you want a hollow model, pay attention to the wall thickness. If you want a solid model, you have to pour it all. When it is half dry (it will get hot if you touch it with your hands). (The plaster is still tender at this time, so be careful not to damage the corners. ) dry it after pruning.

Steps and methods of making plaster statues:

1, module manufacturing method:

Mold making is very technical, so you must be patient when copying, and you must ponder while doing it, so as to effectively improve the quality of the model. Brush the plaster head with thick soapy water as an isolation layer before copying, and then practice after drying.

Block molds are generally from bottom to top, then on both sides and finally in the middle. In addition, before making a part, make every part of the body concave.

When making the mold, first soak the soapy water in the helium flap with a brush, then suck the soapy water clean with a brush, and make a circle with a flat mud strip or plasticine strip along the parting line of the helium flap. The height of the mud bar is about 2-3 cm, and the mud is "splayed". In order to strengthen the strength of block mold, it is necessary to add an appropriate amount of 400-500 cement to gypsum powder, and about one pot of gypsum powder needs to be filled with about two lunch boxes of cement, so it must be stirred evenly. When the mold is turned over, a proper amount of gypsum slurry can be poured into the mud ring of the module before the mold is turned over in proportion, and the thickness is about 2-4 cm. The larger original module is located in the concave part of the main body. In order to take the mould conveniently, the V-shaped pull ring bent by No.8 iron wire can be inserted when the gypsum slurry is semi-cured, and a small amount of hemp fiber can be added to strengthen the hardness of the mould, but it cannot be exposed on the mould surface to affect the mould repair and tenoning. After the module is solidified, fold the mud ring, take out the module, and smooth the surface and peripheral parts of the module with the knife used by the shoemaker to repair shoes. Handle the slope and tenon of the section as required, and then put away the model. When copying other modules, there is no need to enclose the place connected with the previous one with mud. Don't unreasonably turn two molds into one, which will affect the quality of mold making. After turning the module (one side of the gypsum image) in turn as described above, you can turn the large mold. Brush the surfaces of all modules with soap solution once or twice before turning over. After drying, wrap the pull ring of the block mold with soft mud, and then make a circle along the edge of the whole module with thick and wide mud strips. After injecting gypsum slurry, when it is about to solidify, tie the iron wire with 8- 12 iron wire according to its cross shape. After the model is formed, tie it tightly with a rope and put it in a ventilated place to dry in the shade for maintenance.

2, plaster casting method:

The casting process of plaster statues is easy to master. After the models are opened in turn, the atonement modules are gently taken out one by one according to the mold opening sequence, and then coated with model oil or engine oil for soaking, so as to maintain the modules and reduce water absorption. This can prolong the service life of the model and make the surface of the copied gypsum image smooth and flat.

There is no need to wipe off the residual oil with cotton and then turn it over, then coat each mold with thick soapy water, wait a moment, and then gently wipe off the soapy water. Then put them together one by one, put them on each set of molds, and then firmly bind several sets of molds together in the order of coming back to life to become a complete model. At this time, the gypsum slurry can be poured. Watering shall be carried out according to the following procedures:

(1) Adjust an appropriate amount of gypsum slurry and pour it slowly along the side of the grouting port. Never pour into the mold suddenly, which will affect the quality of the finished product.

(2) Hold the mold with both hands and shake it, so that gypsum slurry flows spirally from the bottom to the mold mouth, and the remaining slurry is poured out, so that a layer of gypsum slurry is uniformly attached to each part of the mold. According to this method, the thickness of the internal mold (plaster head) will reach 1- 1.5cm, and it can be thicker below the neck to avoid top-heavy and unstable placement.

(3) Mold opening and gypsum image taking still need to be carried out in the order of modules. If some modules are not easy to take off after solidification, you can gently knock them out with the wooden handle of the shovel to make them vibrate, and you can take them off. After the plaster head is taken out, repair the parting line with a shovel. At this point, a complete plaster statue of the chief was cast.

(4) When copying plaster head, the following problems are easy to occur:

A, Chacon appears on the surface of gypsum image because the model is too dry and the water absorption is too strong. Therefore, mold should be soaked in soapy water before watering, that is, Chacon can be removed.

The philosophical crack of phased mold line is that the model is not tightly bound and loose modules.

C, the surface is wrinkled, because the first layer of gypsum slurry is too thin, and the adhesion is poor.

D, the release agent is thick, and the surface of the plaster image is dull and uneven.

E, local scarring, because the fragments of the mold were not coated with soapy water, gypsum slurry was tightly attached to the module and was taken away by the module when taking the mold.

F, the first layer of gypsum slurry is too dry, which will lead to large pores in gypsum like eyes and nose, and can be repaired by plastering gypsum slurry with a sculpture knife.

The above briefly introduces the process of making plaster statues for beginners, and there are still many problems to be solved in practice.