Hollow ceramic chopsticks and manufacturing method

Abstract

The invention discloses a hollow ceramic chopstick and a manufacturing method thereof, the hollow ceramic chopstick comprises a hollow chopstick body, the chopstick body comprises a tube body formed by injection molding of a zirconia material, two ends of the tube body are plugged into plugs and then are integrally formed by firing, and the cross section of the chopstick body is one or more of a circle, a triangle, a square or a polygon; according to the hollow ceramic chopstick, the chopstick body is formed by sintering the tube body formed by injection molding of the zirconium oxide material and the plugs at the two ends, a hollow structure is achieved, the problem that the single weight of the zirconium oxide solid all-ceramic chopstick is large is solved, the strength of the chopstick is guaranteed, meanwhile, the weight is reduced, the chopstick is more convenient to use, and the use experience of a user is improved; in the manufacturing process of the ceramic chopsticks, two chopstick bodies are arranged side by side, and the middle and the two ends of the chopstick bodies are connected into a structure similar to a bamboo raft through process ribs, so that the problem that long and thin pieces are prone to deformation in the sintering process is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of chopstick processing, in particular to hollow ceramic chopsticks and a manufacturing method thereof. Background Art

[0002] Ceramic chopsticks are popular among the public because of their advantages such as no rust, no mold, and easy to clean. However, the existing ceramic chopsticks made of daily-use porcelain have the problem of low strength and are easy to break when they fall. Although solid zirconia all-ceramic chopsticks are strong and not easy to break, the chopsticks are heavy and inconvenient to use due to the large specific gravity of zirconia. Hollow zirconia ceramic chopsticks can meet people's demand for chopsticks, but their production faces many difficulties. On the one hand, the product is 218 mm long, and it is easy to bend and deform during the sintering process; on the other hand, due to the slender molding core rod, it is also easy to bend during molding, which will cause uneven wall thickness of the product and the product is not resistant to falling. In addition, due to the slenderness of the product, the conventional injection mold structure is complex and expensive, and the cost of a set of molds is as high as more than 30,000 yuan. Based on the above factors, the zirconia ceramic chopsticks currently on the market only make the tip of the chopsticks into zirconia ceramics, and the back half is made of plastic or wood and other materials, so that the advantages of ceramic chopsticks cannot be fully utilized. Summary of the invention

[0003] The purpose of the present invention is to provide a hollow ceramic chopsticks and a manufacturing method to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A hollow ceramic chopstick, comprising a hollow chopstick body, wherein the chopstick body comprises a tube body formed by injection molding of a zirconium oxide material, plugs are inserted into both ends of the tube body and then integrally fired, and the cross section of the chopstick body is one or more of a circle, a triangle, a square or a polygon;

[0005] The length of the chopstick body is 80-300 mm, the wall thickness of the tube body is 0.5-2 mm, and the internal hollow volume of the chopstick body accounts for 30%-70% of the total volume of the chopstick body.

[0006] Preferably, the plug is made of the same zirconia material as the tube body, and the connecting contact surface between the plug and the tube body is a frosted surface.

[0007] Preferably, the outer surface of the chopstick body is provided with an anti-slip texture, and the depth of the anti-slip texture is 0.1-0.5 mm.

[0008] Preferably, when the cross-section of the chopstick body is circular, the diameter of the chopstick body is 5-10 mm, and when the cross-section of the chopstick body is square, the side length of the chopstick body is 5-10 mm.

[0009] Preferably, the chopstick body is one or more of white, black or colorful.

[0010] A method for manufacturing hollow ceramic chopsticks, used for manufacturing the hollow ceramic chopsticks described in any one of the above, comprising the following steps:

[0011] S1, tube preparation: a long tube is made of zirconium oxide material by injection molding process, the injection molding pressure is 100-300MPa, and the temperature is 150-300℃;

[0012] S2, plug production: Make a plug that matches the tube body. The plug is also made of zirconium oxide. It is pressed by a mold and then sintered. The pressing pressure is 50-150MPa, and the outer diameter of the plug after grinding is 0.1-0.2mm larger than the inner diameter of the tube body.

[0013] S3, assembly: insert two plugs into both ends of the pipe body;

[0014] S4, connection and initial shaping: Arrange the assembled chopsticks in pairs side by side, connect them in the middle and at both ends with ribs to form a bamboo raft-like structure, with the ribs having a thickness of 0.3-0.8 mm and a width of 1-3 mm;

[0015] S5, sintering: placing the chopstick body connected with the process ribs horizontally on an alumina plate, and then placing it in a sintering furnace for integrated sintering, the sintering temperature is 1200-1600°C, and the sintering time is 2-6 hours;

[0016] S6, post-processing: After sintering is completed, the process ribs are removed, and the rough chopstick body is ground, polished or colored to finally obtain the finished chopstick body.

[0017] Preferably, in the tube preparation step of S1, the mold for processing the tube body adopts a detachable segmented mold, each segment of the mold is 20-50 mm long, and the injection molding process has an injection speed of 5-15 cm 3 / s, so that the wall thickness uniformity deviation of the pipe body is within ±0.1mm.

[0018] Preferably, in the S4 connecting and initial shaping step, a buffer groove is provided at the connecting portion between the process rib and the chopstick body, and the buffer groove has a depth of 0.2-0.5 mm and a width of 0.5-1.5 mm.

[0019] Preferably, in the sintering step of S5, a temperature gradient is set in the sintering furnace so that the sintering temperature of the chopstick body from the inlet to the inside is gradually increased according to a gradient of 10-20°C.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The hollow ceramic chopsticks of the present invention are formed by sintering a tube body and plugs at both ends of the tube body formed by injection molding of zirconium oxide material, thereby realizing a hollow structure, overcoming the problem of heavy weight of solid zirconium oxide all-ceramic chopsticks, reducing the weight while ensuring the strength of the chopsticks, making them lighter to use and improving the user experience. In the manufacturing process of the ceramic chopsticks of the present invention, the problem of easy deformation of slender parts during sintering is effectively solved by arranging two chopstick bodies side by side and connecting them in the middle and at both ends with process ribs to form a structure similar to bamboo rafts. In addition, the thickness and width of the process ribs are reasonably set, and a buffer groove is set at the connection between the process ribs and the chopstick bodies, thereby further optimizing the structure, further avoiding the risk of deformation during the sintering process, and improving the product yield rate.

[0022] 2) In the step of preparing the tube body of the chopstick body of the present invention, a detachable segmented mold is used, each segment of the mold is 20-50 mm long, and the injection molding process has an injection speed of 5-15 cm 3 / s, which can control the uniformity deviation of the wall thickness of the tube body within ±0.1mm, ensuring the quality of the tube body. In the sintering step, a temperature gradient is set in the sintering furnace, so that the sintering temperature of the chopstick body from the entrance to the inside is gradually increased according to the gradient of 10-20°C, further reducing the deformation during the sintering process. At the same time, it improves the production efficiency and product quality of the hollow ceramic chopsticks, reduces the production difficulty, and is conducive to the large-scale production and promotion of hollow ceramic chopsticks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the chopstick body of the present invention;

[0025] Figure 3 For the present invention Figure 2 An enlarged schematic diagram at position A;

[0026] Figure 4 For the present invention Figure 2 Enlarged schematic diagram at point B.

[0027] In the figure: 100, chopstick body; 110, tube body; 120, plug; 130, anti-slip texture; 121, frosted surface; 200, process ribs; 210, buffer groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0030] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figures 1 to 4 , the present invention provides a technical solution:

[0033] A hollow ceramic chopstick comprises a hollow chopstick body 100. The chopstick body 100 comprises a tube body 110 formed by injection molding of a zirconium oxide material. Both ends of the tube body 110 are plugged with plugs 120 and then integrally fired. The cross section of the chopstick body 100 is one or more of circular, triangular, square or polygonal.

[0034] In this embodiment, the length of the chopstick body 100 is 80-300 mm, the wall thickness of the tube body 110 is 0.5-2 mm, and the internal hollow volume of the chopstick body 100 accounts for 30%-70% of the total volume of the chopstick body.

[0035] Specifically, the wall thickness range of the tube body 110 is initially controlled to be 0.5-2 mm. It has been verified that when the wall thickness is 0.5 mm, although the chopsticks are light, the tube body 110 will not break easily when clamping hard food or occasional collisions, taking into account factors such as lateral forces that may be applied in daily use. When the wall thickness reaches 2 mm, while ensuring sufficient strength, the weight advantage brought by the hollow structure can still be maintained. In addition, the wall thickness range matches the length of the tube body 110, the overall structure of the chopstick body 100, and the characteristics of the zirconium oxide material used, ensuring that the chopsticks are both light and durable.

[0036] After further precise mechanical analysis and weight optimization experiments, it was found that when the hollow part inside the chopstick body 100 accounts for less than 30%, the hollow structure has limited effect on reducing the weight of the chopsticks and cannot fully reflect the advantages of the hollow design. When the proportion is greater than 70%, the structural strength of the chopstick body 100 will be significantly reduced, making it difficult to meet various stress conditions in daily use. The wall thickness, cross-sectional shape, and length of the chopstick body 100 are fully considered to restrict and balance each other to ensure that the chopsticks are optimal in weight and strength.

[0037] In this embodiment, the plug 120 is made of the same zirconium oxide material as the tube body 110, and the connecting contact surface between the plug 120 and the tube body 110 is a frosted surface (121).

[0038] Specifically, the selected zirconium oxide material has the characteristics of high hardness, high wear resistance and chemical stability, which ensures the uniform performance of the plug 120 and the tube body 110 under different usage environments. The roughness of the frosted surface 121 is set to Ra0.8-Ra1.6. Compared with the smooth surface, it can significantly increase the friction between the plug 120 and the tube body 110. During the sintering process, due to the similar thermal expansion coefficients, the two can be better combined, and a firm connection is formed after sintering, which effectively prevents the plug 120 from falling off due to external force during use, thereby greatly improving the overall structural stability and service life of the chopsticks.

[0039] In this embodiment, the outer surface of the chopstick body 100 is provided with an anti-skid texture 130 , and the depth of the anti-skid texture 130 is 0.1-0.5 mm.

[0040] Specifically, after many experiments, the depth of the anti-skid texture 130 is controlled between 0.1-0.5 mm. When the depth is less than 0.1 mm, the anti-skid effect is not obvious; when it is greater than 0.5 mm, it will not only affect the smoothness of the chopstick surface, making it difficult to clean, but also may scratch the user's hands or tableware.

[0041] Furthermore, the shape of the anti-slip texture 130 can adopt a staggered diamond grid. The diamond grid anti-slip texture 130 can provide effective anti-slip effect in multiple directions, and can ensure that the user has a good gripping experience whether clamping round food or flat food during use.

[0042] In this embodiment, when the cross section of the chopstick body 100 is circular, the diameter of the chopstick body 100 is 5-10 mm; when the cross section of the chopstick body 100 is square, the side length of the chopstick body 100 is 5-10 mm.

[0043] Specifically, through ergonomic research, it was found that when the diameter is less than 5 mm, it is difficult for users to hold the chopsticks comfortably, affecting the accuracy and flexibility of the operation. When the diameter is greater than 10 mm, the chopsticks appear too thick and do not conform to the habits of most people in using chopsticks. Combined with the hollow structure of the chopsticks, the overall lightness is maintained while ensuring that the chopsticks are strong enough for daily use.

[0044] In this embodiment, the chopstick body 100 is one or more of white, black or colorful.

[0045] Specifically, by adding inorganic pigments to the zirconium oxide raw material, the chopstick body 100 can be made black or colorful. Compared with the traditional surface coloring method, the added inorganic pigments can be evenly distributed inside the entire chopstick body 100, the color is more durable, not easy to fade, and the quality of the chopsticks is improved.

[0046] A method for manufacturing hollow ceramic chopsticks, used to manufacture any of the hollow ceramic chopsticks mentioned above, comprising the following steps:

[0047] S1, preparation of the tube body 110: the long tube body 110 is made of zirconium oxide material through an injection molding process. According to the rheological properties and molding requirements of zirconium oxide, the pressure of injection molding is determined to be 100-300MPa and the temperature is 150-300°C. When the pressure is lower than 100MPa, it is difficult for the zirconium oxide powder to fully fill the mold, which may easily lead to holes or uneven density defects in the tube body 110. When it is higher than 300MPa, it may cause excessive pressure on the mold and shorten the life of the mold. The temperature is also an important consideration. When it is lower than 150°C, the fluidity of zirconium oxide is poor, which is not conducive to molding. When it is higher than 300°C, it will cause decomposition or performance changes of zirconium oxide.

[0048] During injection molding, the cooling rate of the mold is 10-30°C / minute, which enables the tube body 110 to maintain good shape accuracy and internal structural stability after demolding, and avoids deformation or cracking of the tube body 110 due to internal stress generated by excessive cooling;

[0049] S2, manufacturing of the plug 120: manufacturing the plug 120 matching the tube body 110. The plug 120 is also made of zirconia material, and is formed by sintering after being pressed by a mold. The pressing pressure is 50-150 MPa, and the outer diameter of the plug 120 after grinding is 0.1-0.2 mm larger than the inner diameter of the tube body 110. When the pressure is lower than 50 MPa, the density and strength of the plug 120 are insufficient. When the pressure is higher than 150 MPa, cracks or shape deviations may occur in the plug 120. Therefore, the pressing pressure is set within the range of 50-150 MPa to ensure the density and shape accuracy of the plug 120.

[0050] S3, assembly: insert two plugs 120 into both ends of the tube body 110. During assembly, a positioning fixture can be used to clamp and position the tube body 110, thereby ensuring the position accuracy of the plug 120 when inserted into the tube body 110, so that the connection between the plug 120 and the tube body 110 is more accurate and stable. The outer diameter of the plug 120 after grinding is 0.1-0.2mm larger than the inner diameter of the tube body 110, which can effectively ensure the interference of assembly, and then use the shrinkage of the ceramic sintering process to achieve connection and sealing;

[0051] S4, connection and initial shaping: Arrange the assembled chopstick bodies 100 in two pieces side by side, connect the middle and both ends with the craft ribs 200 to form a structure similar to a bamboo raft, the thickness of the craft ribs 200 is 0.3-0.8 mm, and the width is 1-3 mm;

[0052] S5, sintering: placing the chopstick body 100 connected with the process ribs 200 horizontally on an alumina plate, and then placing it in a sintering furnace for integral sintering, the sintering temperature is 1200-1600° C., and the sintering time is 2-6 hours;

[0053] During the sintering process, when the temperature is lower than 1200°C, the zirconium oxide cannot be fully sintered, resulting in insufficient density and strength of the chopstick body 100, while when the temperature is higher than 1600°C, the zirconium oxide will be over-sintered, resulting in problems such as grain growth, which will affect the performance of the chopsticks. At the same time, during the sintering process, the atmosphere in the sintering furnace is an oxygen atmosphere with an oxygen flow rate of 5-15L / min. The oxygen atmosphere and flow rate can ensure that the redox state of the zirconium oxide during the sintering process is stable, which helps to improve the quality of the chopstick body 100;

[0054] The use of the process ribs 200 to connect the chopstick bodies 100 can provide sufficient support to prevent the chopstick bodies 100 from deforming during the sintering process, and will not affect the spacing between the chopstick bodies 100 and the overall structure due to excessive thickness or width;

[0055] S6, post-processing: after sintering is completed, the process ribs 200 are removed, and the rough chopstick body 100 is ground, polished or colored to finally obtain the finished chopstick body 100.

[0056] In this embodiment: In the step of preparing the tube body 110 of S1, the mold for processing the tube body 110 adopts a detachable segmented mold, each segment of the mold is 20-50 mm long, and the injection molding process has an injection speed of 5-15 cm 3 / s, so that the wall thickness uniformity deviation of the tube body 110 is within ±0.1mm.

[0057] Specifically, the use of a detachable segmented mold can facilitate mold manufacturing, installation and maintenance. The length of each segment of the mold is determined to be in the range of 20-50 mm according to the slender structural characteristics of the tube body 110, which effectively reduces the difficulty of mold splicing and ensures the sealing of the mold splicing.

[0058] In this embodiment: In the S4 connection and initial shaping step, a buffer groove 210 is provided at the connection position between the process rib 200 and the chopstick body 100. The buffer groove 210 has a depth of 0.2-0.5 mm and a width of 0.5-1.5 mm.

[0059] Specifically, the buffer groove 210 can absorb the greater stress generated by the different thermal expansion coefficients of the process rib 200 and the chopstick body 100 during sintering, thereby further reducing the deformation of the chopstick body 100 .

[0060] In this embodiment: in the sintering step S5, a temperature gradient is set in the sintering furnace so that the sintering temperature of the chopstick body 100 from the entrance to the inside is gradually increased according to a gradient of 10-20°C.

[0061] Specifically, by adopting a gradient method of gradually increasing the sintering temperature, the deformation of the chopstick body 100 caused by a sudden change in temperature can be effectively reduced.

[0062] The optimized processing parameters are determined through experiments. The specific experimental variables and level settings are as follows: Tube body 110 preparation (S1) parameters:

[0063]

[0064] Plug 120 production (S2) parameters:

[0065]

[0066] Connection and initial shaping (S4) parameters:

[0067]

[0068]

[0069] Sintering (S5) parameters:

[0070]

[0071] The optimal parameters are determined as follows:

[0072]

[0073] Experimental process and result analysis

[0074] (I) Experimental process

[0075] ① preparing the tube body 110 according to different parameter combinations (S1);

[0076] For each combination of injection molding pressure, temperature, injection speed and length of each segment of the segmented mold, the tube body 110 is manufactured by injection molding using zirconia material; and the wall thickness uniformity deviation of the tube body 110 is recorded.

[0077] ② Manufacturing of plug 120 (S2);

[0078] The plug 120 is manufactured according to different pressing pressures and subsequently assembled with the corresponding tube body 110 .

[0079] ③Assembly (S3);

[0080] Insert the plugs 120 into both ends of the tube body 110 and observe the tightness of the connection between the plugs 120 and the tube body 110 .

[0081] ④Connection and initial shaping (S4);

[0082] For different combinations of thickness and width of the process ribs 200 and depth and width of the buffer grooves 210, multiple assembled chopstick bodies 100 are arranged in two parallel pairs and connected by the process ribs 200. The deformation during the subsequent sintering process is observed.

[0083] ⑤ Sintering (S5);

[0084] Under different sintering temperatures, times and temperature gradients, the chopstick body 100 connected with the process ribs 200 is horizontally placed on an alumina plate and put into a sintering furnace for integral sintering. The deformation, strength and other quality indicators of the sintered chopsticks are observed.

[0085] ⑥ Post-processing (S6);

[0086] After sintering is completed, the process ribs 200 are removed, and the rough chopstick body 100 is ground and polished to obtain a finished chopstick body 100.

[0087] (II) Results Analysis

[0088] ① Preparation (S1) result of the tube body 110;

[0089] When the injection molding pressure is 100 MPa, the tube 110 is injected at a speed of 5 cm 3 / s, the length of each segment of the segmented mold is 20mm, and the injection molding temperature is 150℃, the wall thickness uniformity deviation is large, reaching ±0.2mm. As the injection molding pressure increases to 200MPa and 300MPa, when other parameters are appropriate (such as injection speed of 10cm 3 / s, the length of each segment of the segmented mold is 35mm, the injection molding temperature is 200℃, and the wall thickness uniformity deviation can be controlled within ±0.1mm.

[0090] ② Result of manufacturing the plug 120 (S2);

[0091] When the pressing pressure is 50 MPa, the density of the plug 120 is relatively low, and it is easy to become loose during the subsequent processing when connected to the tube body 110. When the pressing pressure is 100 MPa and 150 MPa, the quality of the plug 120 is good, and the tightness of the connection with the tube body 110 is good.

[0092] ③ Connection and preliminary shaping (S4) results;

[0093] When the thickness of the process rib 200 is 0.3mm, the supporting effect on the chopstick body 100 during the sintering process is relatively weak, and the chopstick body 100 is prone to deformation. When the thickness of the process rib 200 is 0.5mm and 0.8mm, the supporting effect is better. When the width of the process rib 200 is 1mm, the connection stability of the chopstick body 100 is relatively poor, and it is better when the width is 2mm and 3mm. Under different combinations of the depth and width of the buffer groove 210, when the depth is 0.3mm and the width is 1mm, the buffering effect on the deformation of the chopstick body 100 during the sintering process is better.

[0094] ④ Sintering (S5) results;

[0095] When the sintering temperature is 1200℃, the sintering time is 2 hours, and the temperature gradient is 10℃, the chopsticks are not completely sintered and have low strength. When the sintering temperature is 1400℃, the sintering time is 4 hours, and the temperature gradient is 15℃, the strength of the chopsticks is high and the deformation is small. When the sintering temperature is 1600℃, although the strength is high, it is easy to have deformation problems caused by over-sintering.

[0096] Optimal parameter determination

[0097] When the tube 110 is prepared (S1), the injection molding pressure is 200 MPa, the injection molding temperature is 200°C, and the injection speed is 10 cm 3 / s, length of each segment of the segmented mold: 35mm. When making the plug 120 (S2), the pressing pressure is 100MPa. When connecting and initially shaping (S4), the thickness of the process rib 200 is 0.5mm, the width of the process rib 200 is 2mm, the depth of the buffer groove 210 is 0.3mm, and the width of the buffer groove 210 is 1mm. When sintering (S5), the sintering temperature is 1400℃, the sintering time is 4 hours, and the temperature gradient is 15℃.

[0098] Through the above experimental process, the optimal parameters for the production of hollow ceramic chopsticks were determined. The hollow ceramic chopsticks produced according to the above parameters can achieve a good quality level in terms of wall thickness uniformity, plug connection tightness, sintering deformation and chopstick strength, and have excellent product competitiveness in the market.

[0099] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0100] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A hollow ceramic chopstick, comprising a hollow chopstick body (100), characterized in that: The chopstick body (100) comprises a tube body (110) made of zirconium oxide material after injection molding, the two ends of the tube body (110) are plugged with plugs (120) and then integrally sintered, and the cross section of the chopstick body (100) is one or more of circular, triangular, square or polygonal; The length of the chopstick body (100) is 80-300 mm, the wall thickness of the tube body (110) is 0.5-2 mm, and the internal hollow volume of the chopstick body (100) accounts for 30%-70% of the total volume of the chopstick body.

2. The hollow ceramic chopsticks according to claim 1, characterized in that: The plug (120) is made of the same zirconium oxide material as the tube body (110), and the connection contact surface between the plug (120) and the tube body (110) is a frosted surface (121).

3. The hollow ceramic chopsticks according to claim 1, characterized in that: The outer surface of the chopstick body (100) is provided with an anti-slip texture (130), and the depth of the anti-slip texture (130) is 0.1-0.5 mm.

4. The hollow ceramic chopsticks according to claim 1, characterized in that: When the cross section of the chopstick body (100) is circular, the diameter of the chopstick body (100) is 5-10 mm; when the cross section of the chopstick body (100) is square, the side length of the chopstick body (100) is 5-10 mm.

5. The hollow ceramic chopsticks according to claim 1, characterized in that: The chopstick body (100) is one or more of white, black or colorful.

6. A method for manufacturing hollow ceramic chopsticks, used for manufacturing the hollow ceramic chopsticks according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, preparation of the tube body (110): using zirconium oxide material to make a long tube body (110) through an injection molding process, the injection molding pressure is 100-300 MPa, and the temperature is 150-300° C.; S2, manufacturing the plug (120): manufacturing a plug (120) matching the tube body (110), wherein the plug (120) is also made of zirconium oxide, and is formed by pressing with a mold and then sintering. The pressing pressure is 50-150 MPa, and the outer diameter of the plug (120) after grinding is 0.1-0.2 mm larger than the inner diameter of the tube body (110); S3, assembling: inserting two plugs (120) into both ends of the tube body (110); S4, connection and initial shaping: arranging the assembled chopstick bodies (100) in two parallel pairs, connecting them in the middle and at both ends with craft ribs (200) to form a structure similar to a bamboo raft, wherein the thickness of the craft ribs (200) is 0.3-0.8 mm and the width is 1-3 mm; S5, sintering: placing the chopstick body (100) connected with the process ribs (200) horizontally on an alumina plate, and then placing it in a sintering furnace for integral sintering, the sintering temperature being 1200-1600° C., and the sintering time being 2-6 hours; S6, post-processing: after sintering is completed, the process ribs (200) are removed, and the rough chopstick body (100) is ground, polished or colored to finally obtain a finished chopstick body (100).

7. The method for making hollow ceramic chopsticks according to claim 6, characterized in that: In the tube body (110) preparation step of S1, a detachable segmented mold is used for processing the tube body (110), each segment of the mold is 20-50 mm long, and the injection speed of the injection molding process is 5-15 cm3 / s, so that the wall thickness uniformity deviation of the tube body (110) is within ±0.1 mm.

8. The method for making hollow ceramic chopsticks according to claim 6, characterized in that: In the S4 connection and initial shaping step, a buffer groove (210) is provided at the connection portion between the process rib (200) and the chopstick body (100), and the buffer groove (210) has a depth of 0.2-0.5 mm and a width of 0.5-1.5 mm.

9. The method for making hollow ceramic chopsticks according to claim 6, characterized in that: In the sintering step S5, a temperature gradient is set in the sintering furnace so that the sintering temperature of the chopstick body (100) from the entrance to the inside gradually increases according to a gradient of 10-20°C.

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