A method for cutting and forming clay pieces in combination with a drawing and holding forming method

Abstract

The application belongs to the technical field of pottery production, and particularly relates to a method combining clay sheet cutting forming and pulling forming and application. In the method, the kneaded clay is placed on a pulling plate in a stacking manner, and the clay is beaten into a round clay sheet with uniform thickness by applying uniform force, then the round clay sheet is cut and marked, and finally the cut clay sheet is subjected to pulling forming and holding forming.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pottery preparation, and particularly relates to a method combining clay sheet cutting forming and pulling and holding forming and application. BACKGROUND

[0002] Pottery is an artistic form combining traditional culture and modern art in China, and has experienced a long development. Common pottery preparation processes mainly include three categories: hand forming, pulling forming and mold forming.

[0003] The traditional pulling forming process is to place wet and soft clay on a pulling machine, and to stretch and form the clay in a semi-solid state containing water according to a design concept by using centrifugal force generated during rotation of the pulling machine. The product from the pulling machine can be a practical vessel, including a bowl, a bottle, a jar, a plate and the like, or an artistic work of different shapes.

[0004] Traditional ceramic vessels pay more attention to the front surface and the outer surface, but the innovation and exploration of the interior of the ceramic vessels are still limited due to the process limitation of the conventional pulling method. Therefore, most of the pottery vessels produced at present have certain limitations in terms of the use mode of industrial products or the viewing mode of artistic works, which also reflects that the development of modern ceramic vessels is limited to a certain extent.

[0005] Therefore, it is necessary to improve the traditional pottery preparation process to perfect the functionality of the inner surface of a single ceramic vessel. SUMMARY

[0006] Therefore, the main purpose of the application is to provide a process method and application combining clay sheet cutting forming and pulling and holding forming for preparing pottery products, and the specific technical scheme is as follows.

[0007] A method for preparing pottery by combining clay sheet cutting and pulling and holding forming, comprising the following steps:

[0008] S01: preparing mixed clay, the mixed clay comprising the following raw materials by weight: 55-60 parts of mineral clay, 38-44 parts of high-temperature non-shrinkage auxiliary clay and 1-2 parts of talc powder, the high-temperature non-shrinkage auxiliary clay comprising red mineral clay or quartz sand calcined at high temperature;

[0009] S02: mixing the mixed clay with water, fully stirring and kneading the mixed clay in a vacuum environment, and kneading the mixed clay into a clay ball after the components are uniformly mixed;

[0010] S03: Place the mud ball on the slab in a stacked manner, and apply uniform force to beat it into a round mud piece with uniform thickness, the thickness of the round mud piece ranges from 10-15 cm and the bottom is tightly attached to the slab (beating the mud ball into a mud piece is to facilitate subsequent forming by hand-pulling, if the mud piece is not tightly attached to the slab, it will affect the technical effect of the subsequent hand-pulling forming process);

[0011] S04: Cut the beaten mud piece into two halves horizontally, keep the lower half and remove the rest, and cut a circular arc line on the plane of the kept mud piece; preferably, the thickness of the kept mud piece is not less than 10 cm;

[0012] S05: Rotate the slab-pulling machine at a uniform speed, and perform slab-pulling and hand-pulling forming on the cut mud piece, and smooth the outer surface of the formed body when it is semi-dry;

[0013] S06: Perform glazing and firing after the body is completely dry.

[0014] Further, the particle size of the red mud in S01 is greater than 200 mesh; the particle size of the auxiliary mud includes less than 10 mesh, less than 24 mesh, or less than 32 mesh.

[0015] Further, the auxiliary mud in S01 is quartz sand with a particle size of less than 10 mesh.

[0016] Further, the quartz sand includes land sand and sea sand.

[0017] Further, the water content of the mud ball in S02 ranges from 15%-20%.

[0018] Further, the slab-pulling and hand-pulling forming operation in S05 is to take the bottom of the mud piece as the force point, and to pull up the mud piece to shape the vessel by applying upward force.

[0019] Further, the body prepared in S06 is glazed, and the glaze is prepared by mixing red mud powder with a particle size of less than 200 mesh, copper oxide, manganese oxide, and cobalt oxide in a ratio of 1:1:1:2.

[0020] Further, the firing temperature in S06 ranges from 1150-1200℃. Preferably, it is 1180℃.

[0021] The ceramic product prepared by the above method.

[0022] Further, the ceramic product has a smooth outer surface and a line-shaped and granular structure inside.

[0023] The application of the ceramic product prepared by the above method in making decorative products and / or practical vessels.

[0024] Beneficial technical effects

[0025] 1. The present application adopts the process method of combining the cutting and forming of clay sheet with the pulling and holding of the pulling of the blank, and prepares a one-piece formed ceramic product with special appearance and internal texture. The external surface of the ceramic product is smooth and glossy, and the internal surface has both line-shaped and granular texture, so that the whole ceramic product presents a strong visual contrast between the internal and external surfaces. The process method of the present application overcomes the defects of the traditional ceramic pulling process, i.e. the decoration effect can only be achieved by post-decorating and the single shape of the vessel prepared by the traditional pulling process.

[0026] 2. The method of the present application realizes the redesign of the traditional vessel shape by the ingenious clay preparation and blank cutting, and reconstructs the internal structure of the vessel in a unique vortex decoration manner, so that the ceramic product has high artistic value.

[0027] 3. The production process of the present application is simple and convenient for popularization. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0029] Figure 1 The process flow chart of the method of the present application;

[0030] Figure 2 The physical diagram of the cut clay sheet of the method of the present application;

[0031] Figure 3 The pulling and holding operation schematic diagram of the method of the present application;

[0032] Figure 4 The perspective view of the ceramic product prepared by the embodiment of the present application;

[0033] Figure 5 The partial detail view of the ceramic product prepared by the embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] As used herein, "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] As used herein, "plurality" means two or more, i.e., it includes two, three, four, five, etc.

[0037] It should be noted that, in this document, the terms "comprising", "comprises", "comprised of" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article or apparatus that includes the element.

[0038] As used in this specification, the term "about", when used in reference to a particular value, typically means + / - 5% of the stated value, more typically + / - 4% of the stated value, more typically + / - 3% of the stated value, more typically + / - 2% of the stated value, even more typically + / - 1% of the stated value, even more typically + / - 0.5% of the stated value.

[0039] In this specification, certain embodiments can be disclosed in a format that is a range. It is to be understood that such a "range" format is used only for convenience and brevity and should be interpreted in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges within that range as if each numerical value and sub-range is explicitly recited. For example, a range of "1 to 10" should be interpreted to include the explicitly recited limits of 1 and 10, but also to include individual numbers such as 2, 3, 4, 5, 6, 7, 8, 9, and 10, as well as sub-ranges such as from 1 to 6.1, from 2 to 9.9999, from 3 to 8, etc.

[0040] Glossary

[0041] ​The "pulling base holding and pulling forming" of the present application refers to that, compared with the traditional pulling base mode, a uniform extrusion and upward force is applied to the straight and uniform rotating base body, the present application takes the bottom of the base body as the force point, and the clay base body is directly held and pulled up for shaping by repeatedly applying the upward force to the base body.

[0042] Example 1

[0043] Preparation of mixed clay

[0044] Two kinds of materials, raw clay and auxiliary clay, are screened.

[0045] 1. Raw clay processing: local clay ore (produced in Chongqing) is screened, impurities are removed, and the clay is loaded into a grinding machine. After grinding for 4-8 hours through the rotation of the machine, the clay is filtered. A 200-mesh filter screen is used, and the rest is discarded, so that the particle size of the clay is 200 mesh or larger, and the clay has plasticity.

[0046] 2. Auxiliary clay screening: different auxiliary clays have different effects. First of all, sharp and hard auxiliary materials are excluded, and auxiliary materials with high temperature non-shrinkage performance can be added, such as clinker (i.e. clay that has been calcined at high temperature) or quartz sand (including land sand and sea sand). Clinker: basically does not deform during the firing process and does not change color. Land sand: after firing, it easily swells and becomes spongy when exposed to water or air, and is easily dissolved. Sea sand: does not easily deform or shrink during firing, so it is preferred.

[0047] 3. Auxiliary clay processing: the auxiliary clay is loaded into a grinding machine, and after grinding for 4-8 hours through the rotation of the machine, the auxiliary clay is filtered. A 100-mesh, 80-mesh, 20-mesh to 10-mesh filter screen is used, and the auxiliary clay is filtered from large to small, obtaining auxiliary clay of different mesh sizes / particle sizes. Finally, auxiliary clay with particle sizes of 10 mesh or less, 24 mesh or less, and 32 mesh or less is selected.

[0048] Clay with a particle size of 80 mesh or less will produce a granular feel during the forming process, and the smaller the mesh size, the stronger the granular feel. Clay with a particle size of 100 mesh or more will not produce a granular feel. Therefore, during the rotation and pulling process, the clay with a smaller mesh size will be extruded to the inner and outer surfaces of the ceramic base body by the clay with a larger mesh size, resulting in a unique granular texture on the inner and outer surfaces of the base body.

[0049] 4. Clay mixing: the content of raw clay with a particle size of 200 mesh or more is highest and does not exceed 60%, the content of auxiliary clay is about 40%, and about 2% of talc is added to increase the strength and plasticity of the material.

[0050] Example 2

[0051] Preparation of glaze

[0052] 1. Screen the red mud (also known as red mud, produced in Chongqing), remove impurities, and load into a polishing machine. After polishing for 4-8 hours by the rotation of the machine, filter the mud. Use a 200-mesh filter screen, and discard the rest. Ensure that the particle size of the mud is 200 mesh or larger.

[0053] 2. Dry the mud from step 1 at room temperature, and then further grind it into a powder with a particle size of less than 200 mesh.

[0054] 3. Take about half of the mud powder and calcine it at 780°C. Keep the other half as is. Mix the calcined mud powder with the other half of the mud powder, and then add copper oxide, manganese oxide, and cobalt oxide. The ratio of the mud powder to copper oxide, manganese oxide, and cobalt oxide is 1:1:1:2. Prepare the glaze.

[0055] Example 3

[0056] Mud sheet cutting combined with pulling and holding forming process

[0057] 1. Add water to the mixed mud from Example 1 and place it in a vacuum mud mill for thorough stirring and preparation. After stirring evenly, knead it into a mud ball. The moisture content of the mud ball at this time is 15%-20% (lower than the ordinary pulling mud with a moisture content of 24%-26%). The kneaded mud ball should have no visible air bubbles and have a viscosity that is not sticky to the hand and does not crack.

[0058] 2. Place the mud ball on the pulling machine and increase the mud amount by stacking the mud balls. Apply uniform force to beat it into a circular mud sheet with uniform thickness, with a thickness range of 10-15 cm and the bottom tightly attached to the pulling plate.

[0059] 3. Cut the beaten mud sheet in half horizontally with a spring wire, leaving the lower half with a thickness of about 10 cm, and remove the rest. Continue to cut a circular arc line on the plane of the remaining mud sheet with a spring wire. See Figure 2 .

[0060] 4. Rotate the pulling machine at a uniform speed to form the cut mud sheet by pulling and holding. Specifically, use the bottom of the mud sheet as the force point and repeatedly apply upward force to pull and shape the mud sheet. See Figure 3 . After forming, dry it at room temperature. When the formed body is semi-dry, carefully trim and polish the outer surface.

[0061] 5. After the body is completely dry, use the glaze from Example 2 to glaze and fire it at a temperature of 1180°C. The finished product is shown in Figure 4 and Figure 5 .

[0062] Example 4

[0063] Results verification

[0064] Table 1 Performance index of prepared clay

[0065]

[0066] Table 2 Touch feeling investigation of clay / clay body prepared by different materials

[0067]

[0068] The clay / clay body in Table 2 is respectively used to prepare ceramic products, and the appearance and quality of the products are investigated.

[0069] Table 3 Investigation of ceramic products prepared by different clay / clay body

[0070]

[0071]

[0072] From the results in Table 3, the outer surface of all the investigated products is smooth and glossy, which is probably due to the careful trimming and polishing of the outer surface of the body when it is semi-dry. However, the inner part of the body cannot be treated by this process, because it will destroy the texture. Therefore, from the different investigated products, it can be seen that: 1) when the mixed clay does not contain talc powder, the toughness of the clay is not enough, so the cracking phenomenon occurs during the throwing process. 2) when the auxiliary material of the mixed clay is land sand, it becomes crisp after being fired and expanded by water, so it cannot present the granular texture. 3) when the water content of the mixed clay is increased, the internal line texture begins to weaken.

[0073] The embodiments of the present application are described above with reference to the drawings; however, the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative, but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all of these belong to the protection of the present application.

Claims

1. A method for preparing pottery by cutting clay slabs and combining them with wheel throwing, characterized in that, Includes the following steps: S01: Prepare mixed mud material, wherein the mixed mud material comprises the following raw materials in parts by weight: 55-60 parts of mineral mud, 38-44 parts of high-temperature non-shrink auxiliary mud and 1-2 parts of talc powder, wherein the high-temperature non-shrink auxiliary mud comprises red mineral mud or quartz sand that has been calcined at high temperature. S02: Mix the mud with water and knead it thoroughly in a vacuum environment until all components are evenly mixed and kneaded into a mud ball; S03: Place the clay lumps onto the potter's wheel in a stacked manner, apply uniform force to pound them into a round clay sheet of uniform thickness, the round clay sheet having a thickness range of 10-15cm and its bottom tightly attached to the potter's wheel. S04: Cut the pounded clay slab horizontally into two halves, keeping the bottom half and removing the rest. Cut an arc on the remaining clay slab. S05: A uniform speed rotating potter's wheel is used to pull and shape the cut clay pieces. When the shaped blank is semi-dry, its outer surface is smoothed. S06: Glaze and fire the body after it has dried completely.

2. The method as described in claim 1, characterized in that, The red clay in S01 has a particle size greater than 200 mesh; the auxiliary clay has a particle size less than 32 mesh.

3. The method as described in claim 2, characterized in that, The auxiliary mud in S01 is quartz sand with a particle size of less than 10 mesh.

4. The method as described in claim 3, characterized in that, The quartz sand includes both land sand and sea sand.

5. The method as described in claim 1, characterized in that, The moisture content of the mud lumps in SO2 ranges from 15% to 20%.

6. The method as described in claim 1, characterized in that, The throwing and shaping operation in S05 involves using the bottom of the clay slab as the point of force and applying an upward force to lift the clay slab and shape it into a vessel.

7. The method as described in claim 1, characterized in that, The blank prepared in S06 is glazed, and the glaze is prepared by mixing red clay powder of less than 200 mesh, copper oxide, manganese oxide and cobalt oxide in a ratio of 1:1:1:

2.

8. The method as described in claim 1, characterized in that, The firing temperature range in S06 is 1150~1200℃.

9. The ceramic artifacts prepared by the method according to any one of claims 1-8.

10. The ceramic product as described in claim 9, characterized in that, The ceramic artifacts have a smooth surface and an internal linear and granular structure.

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