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Making Ceramic Coffee Mugs - Solid and Hollow Grouting |
| Ceramic Mug From:Xinxiang Ceramic Mug Manufacturers 2024-6-12 |
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Xin xiang Ceramic Mug Manufacturer, Some of the commonly used ceramic coffee mugs are made through a grouting process. Which ceramic coffee mugs are produced by grouting and which are produced by roller pressing? In general: mugs with complex shapes, such as irregularly shaped mass-produced ceramic coffee mugs, are mostly produced by grouting; regular shaped cylindrical coffee mugs, most of which are produced by roller pressing. Of course, there are exceptions. For example, the thinner cylindrical shaped ceramic coffee mugs, there are also produced by injection molding. In fact, many coffee mugs are a combination of both production processes. For example, we commonly use ceramic mugs with handles, where the mug is made by roller pressing and the handle is made by grouting. Roller pressing is relatively simple, and today we will explain the production process of grouting.
Grouting process is the use of gypsum mold absorbency, will have the mobility of the mud into the gypsum mold, so that the mud dispersed adhesion in the model, the formation and the model of the same shape of the billet layer of mud, and with the extension of time and gradually thickened, when it reaches a certain thickness, by drying and contraction and detached from the mold wall, and then take out of the mold, the billet system is completed. Grouting process is divided into: hollow grouting and solid grouting.
1. Hollow grouting
Hollow grouting is the use of gypsum model one-sided suction pulp and the formation of products, the thickness of the blank depends on the mud in the model to stay in the time, generally applicable to the injection system pots, mugs, jars, bottles and other hollow vessels or figures, toys and other artistic bone china. With this method of injection into the body, the shape of the injection depends on the shape of the model work surface. The operation process is: first of all, the model work surface of the dust or dry mud clean, assembled model. The moisture content of the model should be maintained at about 5%, too dry and too wet are prone to cause defects in the blank. Grouting its into the slurry speed should not be too fast, should make the model of the air with the injection of slurry and exhaust away. Mud filled model, after an appropriate period of time, so that the adsorption in the mold wall of the mud layer to reach the required thickness, and then pour out the excess mud. Then when the blank hardens and leaves the mold, it can be removed. In order to prevent deformation of the product, the need to thicken the bottom, you can take the second grouting, that is, first injected a small amount of mud at the bottom (commonly known as “foot”), to be slightly dry, and then all the mud filled, and then operated in accordance with the above process.
Hollow grout used in the mud, its specific gravity is generally smaller than the solid grout, about 1.6-1.8. fluidity is generally 10-15 seconds, the consistency of about 1.1-1.4.
In order to speed up the formation of blanks, improve the quality of products and production efficiency, many porcelain factories have adopted centrifugal grouting, and on the basis of the use of photoresistor control, composed of mechanically operated grouting forming assembly line. Centrifugal grouting operation, is to inject mud into the rotating gypsum model, under the action of centrifugal force, so that the mud close to the mold wall, dewatering the formation of blanks. Due to the lightness of the air bubbles in the slurry, when the model is rotating, most of them are concentrated in the middle, and finally ruptured and disappeared. Using this method of injection into the body, the thickness is more uniform, not easy to deform.
Centrifugal grouting slurry used, the size of its solid particles should not be too different, otherwise the coarse particles will be concentrated in the interior of the body, while the fine particles are easy to concentrate on the surface of the model, resulting in uneven organization, uneven contraction. The speed of the model should depend on the size of the product, large products should be slow, small and medium-sized products can be faster, generally 460-540 rpm. If the rotational speed is too slow, it is easy to appear mud grain.
2. Solid grouting
Solid grouting using two gypsum mold surface (model and mold core) between the cavity, mud by the model and mold core of the working surface of the two sides of the water absorption and the formation of products, it is also known as double-sided grout absorption method. Generally used for injection of cups and spoons, fish plates, duck ponds, juice bucket and other shaped products or porcelain plate, can also be injected into the two sides of different shapes and patterns or large, thick-walled products, the thickness of the blank by the model and the cavity between the mold core size to decide. Operation, will be injected into the mud between the model and the mold core, to be most of the water in the mud by the gypsum mold absorption, the blank contraction away from the mold, at this time you can uncover the model, let the blank in the mold core to dry, until the blank in the basic exclusion of water after the blanks, and then take out the blanks. In order to facilitate the grouting of air discharge, must be reserved in the model of the air release pathway.
Solid grout slurry than hollow grout slurry specific gravity, generally between 171.9. The consistency is also higher, and the fineness can be coarsened appropriately. As the model from two directions to suck out the water in the mud, so near the mold wall of the body is more dense, the center part of the body is more loose, the uniformity is not ideal.
In order to speed up the injection of the body into the speed of the body to promote the structure of the body dense, to prevent the plaster mold on both sides of the slurry caused by the body delamination, resulting in cracking, blistering and other defects occur, so many porcelain factories switch to pressure grouting, will be placed in a bucket of slurry to raise the position of the use of slurry to increase the pressure of the slurry bit of energy. There is also the use of compressed air to increase the mud pressure, that is, compressed air pipeline grouting.
Pressure grouting slurry pressure, should be based on the shape and specifications of the product (size and thickness), generally should be controlled in 500-800 millimeters of mercury column, the minimum should not be less than 300 millimeters of mercury column. Practice has proved that increasing the pressure of mud, can improve the strength of the billet ring, reduce porosity, but must pay attention to the model of the reinforcement and close, otherwise prone to rotten mold and run pulp phenomenon.
Production of different requirements of ceramic products, Xinxiang Ceramic Mug Manufacturer technical engineers will choose hollow grouting or solid grouting. These two ways in addition to the mold is not the same, using two ways of mud is also different. The key point is the difference between the liquidity of the two types of slurry. What determines the fluidity is a substance called diluent. We can understand that it is like the role of water in coffee. The more diluent there is, the more fluid the mud will be; conversely, the less fluid it will be. This is the same type of mud used in the common ceramic coffee mugs that we see when the handle is bonded to the mug.
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