Cooking utensil with zero-coating non-stick function

Abstract

The cooking utensil comprises a pot body, a pot cover arranged on the pot body in a covering mode and a pot container arranged in the pot body, and is characterized in that the pot container at least comprises an inner stainless steel layer making contact with food materials, and a groove array is arranged on the inner wall of the inner stainless steel layer; the groove array comprises a plurality of mutually independent grooves, the grooves comprise at least two types of grooves with different sizes, and a single rice grain at least covers two grooves.

Description

[0001] This invention is a divisional application of application number: 2023102305041, application date: 2023-03-06, invention name: A method for making a non-stick pan. Technical Field

[0002] The invention belongs to the field of household appliances, and in particular relates to a method for manufacturing a non-stick pan. Background Art

[0003] Electric cookers, such as rice cookers, typically consist of a pot and a lid. The pot is equipped with a pot core and a heating device, such as a heating plate or an IH coil. The pot core is typically made of metal. When powered on, the heating device transfers heat to the pot core, allowing the rice in the pot to cook. However, electric cookers can sometimes cause the pot to stick during cooking, making it difficult to clean after meals and compromising the user experience. Several solutions exist in the prior art to this problem:

[0004] One method is to provide a non-stick coating on the inner wall of the pot, but the non-stick coating is prone to falling off during long-term cooking, especially in high-temperature cooking and dry-burning conditions. The non-stick coating is more likely to fall off, affecting its anti-stick effect and causing certain impacts on human health. In this regard, the prior art also provides grooves on the inner wall surface of the pot, and only provides the non-stick coating in the grooves, in order to reduce the use area of the coating and minimize the probability of the coating falling off due to factors such as scratching. However, the coating of this solution still has the risk of falling off.

[0005] The other type is to first process a lotus leaf bionic morphology on the kitchenware base, then deposit a layer of composite material film on the surface of the morphology, and then process a lotus leaf bionic morphology on the composite material film again, thereby increasing the kitchenware surface's resistance to food and oil stains, and easy cleaning of water stains. It can be seen that this morphology mainly plays a hydrophobic and oleophobic role. Since the side walls of kitchen utensils such as woks and frying pans are not the main cooking area, the non-stick performance requirements of the side walls are relatively low. Even if the hydrophobic lotus leaf bionic morphology is set on the side walls using this process, it will not have much impact on the overall use effect. However, the side walls of the rice cooker pot will be in uniform contact with the rice. At the same time, the side walls are generally vertical and have a large slope, making it difficult for moisture to retain. If the above-mentioned hydrophobic lotus leaf bionic morphology is set on them, it will further increase the difficulty of retaining moisture on the side walls. Moreover, since rice will precipitate starch during cooking and the gelatinization viscosity is high, if there is less moisture on the side walls, it will easily cause the rice to stick, clump, and burn. Therefore, this process is difficult to apply to the rice cooker pot, and the non-stick effect without coating cannot be achieved. Summary of the Invention

[0006] The present invention provides a method for manufacturing a non-stick pan inner lining to solve at least one of the above technical problems.

[0007] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0008] A method for making a non-stick pan comprises the following steps:

[0009] Step S1: Providing a composite metal plate, the composite metal plate comprising an outer stainless steel layer, a uniformly heated aluminum layer, and an inner stainless steel layer, forming a groove array on the surface of the inner stainless steel layer by etching, engraving, or pressing, the groove array having micron-scale grooves, and the grooves being independently arranged;

[0010] Step S2: stretching the composite metal sheet having the groove array to form a pot blank, wherein the groove array is located on the inner surface of the pot blank;

[0011] Step S3: performing PVD processing on the pot embryo to form a metal protective film on the inner surface of the pot embryo, wherein the thickness of the metal protective film is less than the depth of any groove in the groove array;

[0012] Step S4: performing nano-processing on the pot embryo provided with the metal protective film to form nano-scale anti-sticking lines on the surface of the metal protective film.

[0013] In one embodiment of the present invention, step S3 further includes polishing and cleaning the inner surface of the pot embryo, and the polishing and cleaning are performed before the pot embryo is subjected to PVD processing.

[0014] In one embodiment of the present invention, a rib is provided between two adjacent grooves, and the nano-scale anti-sticking pattern is provided on the rib.

[0015] In one embodiment of the present invention, the area of the nano-scale anti-sticking lines is larger than the area of the grooves.

[0016] In one embodiment of the present invention, the nano-scale anti-sticking lines are arranged corresponding to the grooves and are located inside the grooves.

[0017] In one embodiment of the present invention, the thickness of the metal protective film is 0.5 micrometers to 2.5 micrometers.

[0018] In one embodiment of the present invention, the metal protective film is a Cr layer fused with the pot embryo substrate.

[0019] In one embodiment of the present invention, the Cr layer is sequentially composed of a CrFeNi alloy layer and a CrFe alloy layer from the inside to the outside.

[0020] In one embodiment of the present invention, the equivalent diameter of the groove is 100 micrometers to 600 micrometers.

[0021] In one embodiment of the present invention, the nanoscale anti-sticking pattern includes a plurality of protrusions or depressions, each of which has a first direction parallel to the surface of the metal protective film and a second direction perpendicular to the first direction; the maximum size of the protrusion or depression in the first direction does not exceed 900 nanometers, and / or the maximum size of the protrusion or depression in the second direction does not exceed 900 nanometers.

[0022] After adopting the above technology, the beneficial effects of the present invention are:

[0023] The production process disclosed in the present invention is relatively simple. By arranging a groove array on the inner stainless steel layer, the geometric structure of the surface of the inner stainless steel layer is changed, so that it has good water storage performance. Moreover, since the micron-sized grooves are independently arranged and not interconnected, when the rice is cooked, the small amount of water remaining in the pot and the water vapor in the gaps between the rice enter the grooves and condense to form small water droplets. These small droplets can be constrained by the groove walls and retained in the grooves under the action of surface tension, thereby stably forming a layer of moist film between the rice and the inner pot. This moist film will infiltrate the rice and the inner wall of the inner pot, reduce the adhesion between the rice and the inner pot, and prevent the rice from sticking to the inner wall of the inner pot, thereby achieving a non-coating and non-stick effect. In addition, by first forming grooves on the metal plate and then stretching the plate to form a pot embryo, the grooves on the side walls of the pot can be deformed during the stretching process. , making the width of the grooves in this area smaller in the circumferential direction of the pot, thereby making it more restraining to the water droplets, so that the moisture can be better retained, avoiding the problem of excessive moisture flowing to the bottom wall due to the vertical side wall, causing the rice to stick to the side wall; at the same time, by performing PVD processing on the pot embryo to form a metal protective film on the inner surface of the pot embryo, the surface performance of the pot can be further improved, and the attenuation of the anti-stick effect of the groove array caused by long-term scratching can be prevented, thereby improving the reliability of the pot and making the pot more durable. In addition, by making the thickness of the metal protective film smaller than the depth of the grooves in the groove array, the metal protective film can be prevented from filling the grooves, ensuring that the grooves can play a role. In addition, by performing nano-processing on the surface of the formed metal protective film to form nano-level anti-stick patterns, the contact area between the rice and the pot is further reduced, so that the overall non-stick performance of the pot can be further improved.

[0024] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a process for making a non-stick pan inner layer according to one embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of the inner pot according to one embodiment of the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of the inner pot according to one embodiment of the present invention;

[0028] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at A in the middle;

[0029] Figure 5 for Figure 3 Schematic diagram of the local enlarged structure at B in the middle;

[0030] Figure 6 This is a schematic structural diagram of a cooking utensil with a zero-coating non-stick pot bottom according to one embodiment of the present invention.

[0031] Figure numerals: pot body 100; heating device 110; pot core 200; inner stainless steel layer 201; uniform heat aluminum layer 202; outer stainless steel layer 203; groove 204; partition rib 205; metal protective film 206; bottom wall 210; first groove array 211; side wall 220; second groove array 221; mouth 222; waist 223; transition connection part 224; cooking cavity 230; pot cover 300. DETAILED DESCRIPTION

[0032] The present invention provides a method for making a non-stick pot inner shell, and more particularly relates to a method for making a zero-coating rice pot inner shell. The pot inner shell is mainly used for cooking rice. The rice cooking utensil can be an electric rice cooker or a pressure cooker. In some other embodiments, it can be other cooking utensils with rice cooking functions.

[0033] Most existing pots and pans have a coated interior, meaning a Teflon coating (polytetrafluoroethylene, PTFE) is applied to the inner surface of the pot. The non-coated pot and pan of the present invention is different from the coated pot and pan. Instead of applying a coating to the base material of the pot, the inner wall of the pot is a metal layer that comes into contact with food. The metal layer can be made of stainless steel. During cooking, food comes into contact with and is cooked directly through the metal layer of the pot, thus eliminating the coating shedding and dietary health problems associated with coated pots and pans.

[0034] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the technical solutions and embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As one of ordinary skill in the art will understand, other orders of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as limiting the claims. In addition, the claims to the method and / or process should not be limited to performing their steps in the order written, and those skilled in the art can readily understand that these orders can be changed and still remain within the spirit and scope of the embodiments of the present invention.

[0036] refer to Figure 1 and Figure 5 The present embodiment provides a method for making a non-stick pan, comprising the following steps:

[0037] Step S1: Providing a composite metal plate, the composite metal plate comprising an outer stainless steel layer 203, a uniformly heated aluminum layer 202, and an inner stainless steel layer 201. A groove array is formed on the surface of the inner stainless steel layer 201 by etching, engraving, or pressing. The groove array comprises micron-sized grooves 204, and the grooves 204 are independently arranged.

[0038] Step S2: stretching the composite metal sheet having the groove array to form a pot blank, wherein the groove array is located on the inner surface of the pot blank;

[0039] Step S3: performing PVD processing on the pot embryo to form a metal protective film 206 on the inner surface of the pot embryo, wherein the thickness of the metal protective film 206 is less than the depth of any groove in the groove array;

[0040] Step S4: performing nano-processing on the pot embryo provided with the metal protective film 206 to form nano-scale anti-sticking lines on the surface of the metal protective film.

[0041] In this embodiment, the metal protective film 206 is applied to the pot body by physical vapor deposition (PVD), which uses physical methods (such as evaporation and sputtering) to vaporize the coating material and deposit it onto the substrate surface. The "nano-processing of the pot body with the metal protective film" can be performed by photolithography or etching, and is not specifically limited here.

[0042] By arranging a groove array on the inner stainless steel layer 201, the geometric structure of the surface of the inner stainless steel layer 201 is changed, so that it has good water storage performance. When the rice is cooked, the arrangement of the groove array can reduce the direct contact area between the rice and the pot body, thereby reducing the heat directly transferred to the rice from the pot body, and avoiding the rice from being burnt and sticky due to excessive temperature. Moreover, since the micron-sized grooves 204 are independently arranged and not interconnected, the small amount of water remaining in the pot body and the water vapor in the gaps between the rice enter the grooves 204 and condense to form small water droplets, which can be constrained by the groove walls and retained in the grooves under the action of surface tension, thereby forming a stable water film between the rice and the inner pot. This water film will infiltrate the rice and the inner wall of the inner pot, reduce the adhesion between the rice and the inner pot, and prevent the rice from sticking to the inner wall of the inner pot, thereby achieving a non-coating and non-stick effect. In addition, by first forming the grooves 204 on the metal plate and then Stretching is performed to form the pot embryo, so that the grooves on the side walls of the pot can be deformed during the stretching process, making the width of the grooves in this area smaller in the circumferential direction of the pot, thereby increasing the restraining force on water droplets and better retaining moisture, thereby avoiding the problem of excessive water flowing to the bottom wall due to the relatively vertical side walls, causing rice to stick to the side walls; at the same time, by performing PVD processing on the pot embryo to form a metal protective film on the inner surface of the pot embryo, the surface performance of the pot can be further improved, and the attenuation of the anti-stick effect of the groove array caused by long-term scratching can be prevented, thereby improving the reliability of the pot; and by making the thickness of the metal protective film smaller than the depth of the groove 204 in the groove array, the metal protective film can be prevented from filling the groove, thereby ensuring that the groove 204 can play a role; in addition, by performing nano-processing on the surface of the formed metal protective film to form nano-level anti-stick patterns, the contact area between the rice and the pot is further reduced, so that the overall non-stick performance of the pot can be further improved.

[0043] The rice cooking completion stage refers to the stage when the water is almost dry after the rice boiling stage is completed. It can be the stewing stage, the keeping warm stage, or a combination of the two or other stages after the boiling stage, which is not limited here.

[0044] It should be noted that in step S1, the composite metal sheet may also be composited with other layers besides the outer stainless steel layer 203, the uniform heat aluminum layer 202, and the inner stainless steel layer 201, such as a highly thermally conductive liquid or a highly magnetically conductive material. The outer stainless steel layer 203 is relative to the inner stainless steel layer 201 that comes into contact with the food, and is not necessarily located on the outermost side of the pot.

[0045] It should also be noted that the present invention does not specifically limit the specific form of the grooves 204. For example, in one specific embodiment, protrusions are machined on the inner surface of the inner stainless steel layer 201. Each protrusion and the inner surface of the inner stainless steel layer enclose a plurality of independent grooves, thereby increasing the contact area between the stainless steel surface and water vapor, and using surface tension to store water droplets in the grooves, ultimately forming a water film. In another specific embodiment, pits are machined on the surface of the inner stainless steel layer 201 in a scattered or arrayed pattern, each pit being disconnected from each other, and using surface tension to store water droplets in the pits. The grooves in the groove array can be any one or a combination of circular, elliptical, teardrop-shaped, diamond-shaped, square, or hexagonal shapes, or other shapes such as special shapes. Those skilled in the art can choose according to actual circumstances.

[0046] Optionally, the outer stainless steel layer 203 and / or the inner stainless steel layer 201 are made of food-grade materials, such as SUS304 or SUS316L, to improve the hygiene of the pot.

[0047] Optionally, in step S2, the "stretching the composite metal sheet provided with the groove array to form a pot embryo" can be specifically divided into different production processes according to the different shapes of the pot core.

[0048] For straight gallbladder, the specifics are:

[0049] S21: Controlling the stretching rate to stretch the composite metal sheet provided with the groove array to form a pot embryo, so that the deformation of the grooves in the groove array meets a preset range.

[0050] For the bladder, it is specifically:

[0051] S21: controlling the stretching rate to stretch the composite metal sheet provided with the groove array to form a preliminary pot blank;

[0052] S22: Controlling the expansion rate to expand the preliminary pot blank to form a final pot blank, so that the deformation of the grooves in the groove array meets a preset range.

[0053] The pot embryo can be punched once by a punching machine, and then expanded twice by a water expansion machine.

[0054] Specifically, refer to Figures 2 to 4, during the stretching and bulging of the composite metal sheet, the metal sheet in the central part of the mold will form the bottom wall 210 of the pot liner, and the grooves on it basically do not deform. The metal sheet in the peripheral part forms the side wall 220 of the pot liner, and the grooves where deformation occurs are mainly located here. The groove array on the bottom wall is the first groove array 211, and the equivalent diameter of the groove (i.e., the diameter of the largest circumscribed circle of the groove contour) is D. The groove array on the side wall is the second groove array 221, the dimension of the groove in the axial direction of the pot liner is D1, and the dimension in the circumferential direction of the pot liner is D2. The preset range can be:

[0055] The deformation ratio B1 of the grooves in the second groove array 221 in the circumferential direction of the pot liner is not less than 0.3 times. This deformation ratio is the ratio of the circumferential dimension D2 of the grooves in the second groove array 221 to the dimension D of the grooves in the first groove array 211 after stretching.

[0056] In this way, the deformation of the grooves can be within a suitable range, ensuring that they have a greater binding force on water droplets, enabling better retention of moisture, and at the same time, they will not fail to play the role of storing moisture due to too small circumferential width.

[0057] Of course, in some alternative embodiments of the present invention, the preset range can also be: the ratio of the dimension D1 of the grooves in the second groove array 221 in the axial direction of the pot liner to the dimension D2 in the circumferential direction of the pot liner is B2, and 1 < B2 ≤ 2. In this way, it can be avoided that the grooves on the side wall become slender and form slits due to excessive contraction in the circumferential direction and excessive elongation in the axial direction, preventing the problem that the grooves get stuck with starch particles or other food residues, resulting in the inability to clean the inner wall of the pot liner thoroughly, being prone to dirt accumulation, affecting food hygiene, and being prone to odor transfer, thus improving the user experience.

[0058] It can be understood that, according to the needs of the actual product, the deformation ratio B1 can be 0.4, 0.6, 0.7, 0.8, 0.9, 1, etc., and the specific value of B2 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, etc.

[0059] Optionally, in step S3, it further includes polishing and cleaning the inner surface of the pot embryo, and the polishing and cleaning process is set before the PVD processing of the pot embryo, that is:

[0060] Step S31: Polish and clean the inner surface of the pot embryo;

[0061] Step S32: Perform PVD processing on the polished and cleaned pot embryo to form a metal protective film 206 on the inner surface of the pot embryo, and the thickness of the metal protective film 206 is less than the depth of any groove in the groove array.

[0062] Optionally, the step S31 may further include: carving or sandblasting the groove array on the inner surface of the pot embryo to form a rough surface in the groove; the carving or sandblasting is performed before polishing and cleaning.

[0063] It should be noted that the polishing can be mechanical polishing or chemical polishing, and the engraving can be photolithography or laser engraving, or mechanical engraving, and the present invention does not limit this. Of course, in step S3, before the pot embryo is subjected to PVD processing, other steps may also be included, such as groove array shaping, oil removal, drying, etc., and the present invention does not limit this. Those skilled in the art may add or subtract these steps according to actual needs.

[0064] In some specific embodiments of the present invention, reference Figure 5 A partition rib 205 is provided between two adjacent grooves 204 , and the nano-scale anti-sticking pattern is provided on the partition rib 205 .

[0065] The setting of the groove 204 and the partition rib 205 can reduce the direct contact area between the rice and the inner pot, thereby reducing the heat directly transferred to the rice from the inner pot, so that the rice grains will not stick or burn due to being close to the inner surface of the pot. By setting nano-scale anti-stick patterns on the metal protective film corresponding to the partition rib 205, the contact area can be further reduced, and the non-stick effect is further improved.

[0066] Preferably, the width of the ribs 205 is 100 microns to 500 microns, so that the moisture film on the inner surface of the pot is evenly distributed and the overall non-stick effect is stable.

[0067] Furthermore, the area of the nano-scale anti-sticking lines is larger than the area of the grooves.

[0068] In some specific embodiments of the present invention, the nano-scale anti-sticking pattern is disposed corresponding to and within the groove. The provision of the nano-scale anti-sticking pattern increases the roughness within the groove 204, further improving its ability to store and retain water. Compared to smooth metal surfaces, water can adhere more easily, thereby forming a more stable water film on the bile wall, thereby enhancing the non-stick effect of the uncoated material.

[0069] Of course, in some alternative embodiments, nano-scale anti-sticking patterns may be provided on both the metal protective film corresponding to the ribs 205 and the metal protective film corresponding to the grooves 204, which is not specifically limited here.

[0070] In some specific embodiments of the present invention, the thickness of the metal protective film is 0.5 microns to 2.5 microns. In other words, the thickness of the metal protective film is H, 0.5 μm ≤ H ≤ 2.5 μm. Controlling the thickness of the metal protective film within this range can achieve better coverage and cost control of the metal protective film. The film will not be too thin to provide effective protection, nor will it be too thick to over-cover the original rough structure in the groove 204, resulting in a reduction in the ability of the groove 204 to store water.

[0071] It is understandable that, according to actual product requirements, the thickness H of the metal protective film can be 0.8 μm, 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, etc.

[0072] In some specific embodiments of the present invention, the metal protective film is a Cr layer fused with the pot embryo substrate. The fusion means that the Cr layer is attached to the surface of the pot embryo substrate, and the two are combined at the contact surface.

[0073] Specifically, during the PVD processing, the target material chromium (Cr) is bombarded by plasma argon (Ar+) ions and electrons, sputtering small molecular clusters of the target material onto the surface of the cookware substrate (inner stainless steel layer). Since the substrate surface and the molecular clusters are highly bonded and close to the metal bond energy, this metal protective layer is difficult to separate; and the Vickers hardness of the Cr layer surface is relatively high, which can reach several times the Vickers hardness of the substrate, and the surface density is very good, with ultra-high wear resistance and scratch resistance, which can maintain a long-lasting non-stick effect; in addition, the formed Cr layer is relatively stable, will not react after high temperature, and will not show a phenomenon similar to the blueing of the stainless steel surface.

[0074] Furthermore, the Cr layer is composed of a CrFeNi alloy layer and a CrFe alloy layer from the inside to the outside.

[0075] In some specific embodiments of the present invention, the equivalent diameter of the grooves 204 is between 100 and 600 microns. This allows the groove equivalent diameter to be within a reasonable range, neither too large to allow rice to easily get stuck in the grooves nor too small to prevent them from storing water and thus affecting the formation of a water film. Furthermore, a single rice grain can be covered by at least two or more grooves. Since rice grains have varying shapes within the inner pot, it is not possible to ensure that all grooves 204 are connected to the rice gaps and function to store condensed water or other liquids. However, by properly controlling the diameter of the grooves 204, some grooves 204 can form anti-sticking cavities between the rice grains. Even if the rice grains trap some water vapor in the anti-sticking cavities due to their own gravity or the pressure of other rice grains, the water vapor contained in the anti-sticking cavities can expand upon heating and lift the rice grains, helping the rice to detach. This, in turn, facilitates the cooperation with the water films formed in the other grooves to further reduce the adhesion between the rice and the inner pot. This ensures that even if some grooves 204 fail to function as water vapor storage cavities, the rice can still be prevented from sticking, thereby enhancing the non-stick effect of the uncoated material.

[0076] It is understandable that, depending on actual product requirements, the equivalent diameter of the groove 204 may be 100, 150, 200, 300, 500, 600 microns, etc.

[0077] Furthermore, the depth of the groove 204 is preferably 30 micrometers to 150 micrometers, for example, 30, 50, 80, 100, 120 or 150 micrometers.

[0078] In some specific embodiments of the present invention, the nanoscale anti-sticking pattern includes a plurality of protrusions or depressions, each of which has a first direction parallel to the surface of the metal protective film and a second direction perpendicular to the first direction; the maximum size of the protrusion or depression in the first direction does not exceed 900 nanometers, and / or the maximum size of the protrusion or depression in the second direction does not exceed 900 nanometers.

[0079] It is understandable that, depending on actual product needs, the maximum dimension in the first direction and / or the maximum dimension in the second direction can be 50, 90, 100, 130, 180, 250, 300, 500, 800, 900 nanometers, etc.

[0080] Preferably, the maximum dimension in the first direction and / or the maximum dimension in the second direction ranges from 300 nanometers to 800 nanometers. This arrangement allows the nanoscale anti-sticking pattern to be within an appropriate size range, ensuring that the nanoscale anti-sticking pattern is neither too small, which would result in excessive processing costs, nor too large, which would easily trap starch particles and make the pot surface difficult to clean. Furthermore, this size also allows the metal protective film to form an appropriate number of protrusions or grooves on its surface, effectively reducing the contact area between rice and the inner wall of the pot. It also allows the metal protective film to be coarsened, preventing the surface from being too smooth, making it easier for water to adhere, thereby forming a more stable water film and giving the inner surface of the pot a better ability to store water and achieve non-stick properties.

[0081] It should be noted that the present invention does not specifically limit the specific form of the nano-scale anti-sticking pattern. For example, in a specific embodiment, the nano-scale anti-sticking pattern has a plurality of independently arranged grooves, and there is a physical gap between the grooves. The maximum dimension in the first direction is the equivalent diameter of the groove, and the maximum dimension in the second direction is the depth of the groove; in another specific embodiment, the nano-scale anti-sticking pattern includes multiple annular grooves, the maximum dimension in the first direction is the width of the groove, and the maximum dimension in the second direction is the depth of the groove; in another specific embodiment, the nano-scale anti-sticking pattern has a plurality of independent protrusions, the maximum dimension in the first direction is the equivalent diameter of the protrusion, and the maximum dimension in the second direction is the height of the protrusion.

[0082] It is understandable that in some alternative embodiments of the present invention, micron-level anti-sticking patterns may also be provided on the metal protective film, which is not specifically limited herein.

[0083] In addition, reference Figure 2 、 Figure 3 and Figure 5 The present invention also proposes a 0-coating non-stick pan. The 0-coating non-stick pan proposed by the present invention will be described in detail below with reference to specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0084] Example 1: This example provides a non-stick pot with zero coating, which includes a bottom wall 210 and a side wall 220. The bottom wall 210 is arranged at the bottom of the pot and is a plane or a curved surface that is slightly raised toward the center and has a certain curvature. The side wall 220 extends upward from the edge of the bottom wall 210, and includes a mouth 222 arranged at the upper part of the pot, a waist 223 arranged below the mouth 222, and an arc-shaped transition connection part 224 connecting the waist 223 and the bottom wall 210. The waist 223 can be set to a form that bulges outward or to a basically vertical form, which is not specifically limited here.

[0085] This inner pot can be made using the aforementioned method. First, a micron-scale groove array is formed on the surface of a composite metal sheet by etching, engraving, or pressing. The composite metal sheet with the groove array is then stretched to form a pot blank. The pot blank is then subjected to PVD processing to form a metal protective film on its inner surface. Finally, the pot blank with the metal protective film is nano-processed to form nano-scale anti-sticking patterns on the surface of the metal protective film. The resulting inner pot comprises three layers: an outer stainless steel layer 203, a uniformly heated aluminum layer 202, and an inner stainless steel layer 201. The inner surface of the inner stainless steel layer 201 has a groove array, and the area where the groove array is located is covered with a metal protective film with nano-scale anti-sticking patterns.

[0086] Example 2: This example provides a non-stick pot with zero coating, which comprises at least an inner stainless steel layer 201 in contact with food, wherein the inner wall of the inner stainless steel layer 201 is provided with a photoetched anti-stick array, wherein the anti-stick array comprises a plurality of protrusions or grooves, wherein the equivalent diameter of the protrusions or grooves is preferably 50 nm to 900 nm, and the anti-stick array is covered with a metal protective Film 206 , the hardness of the metal protective film 206 is greater than the hardness of the inner stainless steel layer 201 .

[0087] It is understandable that, depending on the actual product needs, the equivalent diameter of the protrusion or groove may be 50, 90, 100, 130, 180, 250, 300, 500, 800 or 900 nanometers, etc., and is not specifically limited here.

[0088] In this embodiment, the anti-sticking array can be formed by photolithography on a metal plate, or can be formed by photolithography on the inner surface of a pot embryo that has been formed after stretching.

[0089] This embodiment does not limit the specific form of the metal protective film. For example, in a specific embodiment in, all The anti-sticking array has multiple independent grooves, and the thickness of the metal protective film is nanometer-level and smaller than the depth of the grooves; in another specific embodiment, the anti-sticking array has a pair of protrusions, the thickness of the metal protective film is nanometer-level, and micrometer- or nanometer-level pores are formed on the metal protective film.

[0090] Optionally, the metal protective film 206 is provided with nano-scale anti-sticking lines.

[0091] Optionally, the surface of the metal protective film 206 can be processed with scale lines by laser engraving or other methods. Then The system provides users with cooking instructions, so that users can add a reasonable ratio of rice and water before cooking, thereby cooking higher quality rice and improving the user experience.

[0092] Furthermore, the scale line is set with a maximum cooking rice amount, and the rice height corresponding to the maximum cooking rice amount is less than the distribution height of the anti-stick array on the wall of the pot. This can maximize the probability of rice grains aligning with the anti-stick array when cooking rice, ensuring a non-stick effect.

[0093] Optionally, the anti-sticking array is arranged to avoid the scale lines to improve the clarity of the scale lines.

[0094] Optionally, the anti-stick array is distributed on the bottom wall and at least part of the side wall of the 0-coated non-stick pan. The amount of water is most concentrated, and it is also most likely to cause the problem of sticking to the pan or burning the pan. This setting can ensure that the anti-stick array plays its best role. Use, protect Ensure the non-stick effect in this area.

[0095] Furthermore, the area where the anti-stick array is distributed covers 2 / 3 or more of the inner surface of the pot.

[0096] Optionally, the non-stick pot further comprises an outer stainless steel layer 203 and a non-stick coating layer sandwiched between the outer stainless steel layer 203 and the inner non-stick coating layer. The heat-dissipating layer between the stainless steel layers 201. The heat-dissipating layer can be made of heat-conducting metal materials such as aluminum, or can be made of a material with strong thermal conductivity. Liquid, not limited here.

[0097] Furthermore, the inner stainless steel layer 201 and / or the outer stainless steel layer 203 are made of food grade materials, such as SUS304 or Made of SUS316L material to improve the hygiene of the pot.

[0098] Example 3: This embodiment provides a non-stick pot with a zero coating, which comprises at least an inner stainless steel layer 201 in contact with food, wherein the inner wall of the inner stainless steel layer 201 is covered with a metal protective film 206, and the hardness of the metal protective film 206 is greater than The hardness of the inner stainless steel layer 201 is improved, and the surface of the metal protective film 206 close to the food is formed by photolithography. The anti-adhesive array comprises a plurality of protrusions or grooves, and the equivalent diameter of the protrusions or grooves is preferably 50 nanometers to 900 nanometers.

[0099] It is understood that, according to the actual needs of the product, the equivalent diameter of the protrusion or groove is 50, 90, 100, 130, 180, 250, 300, 500, 800 or 900 nanometers, etc., are not specifically limited here. Or the equivalent diameter of the groove can also be in the micron level, such as 100 microns to 600 microns.

[0100] In this embodiment, before lamination, the inner wall of the inner stainless steel layer 201 may not be processed as in the above embodiment. The groove array.

[0101] This embodiment does not limit the thickness of the metal protective film. For example, in a specific embodiment, the The anti-sticking array includes a plurality of grooves, the depth of the grooves being greater than the thickness of the metal protective film, that is, a portion of the grooves Part of the anti-sticking array is located on the metal protective film, and part of the anti-sticking array is located on the inner stainless steel layer; in a specific embodiment, the anti-sticking array includes Kuaduo A groove is formed, and the depth of the groove is less than the thickness of the metal protective film, that is, the groove is only provided on the metal protective film.

[0102] Optionally, the anti-stick array is distributed on the bottom wall and at least part of the side wall of the 0-coated non-stick pan. The most This is the most concentrated area and is also the most prone to sticking and burning problems. This setting can ensure that the anti-stick array plays its best role and guarantees the non-stick effect in this area.

[0103] Furthermore, the area where the anti-stick array is distributed covers 2 / 3 or more of the inner surface of the pot.

[0104] Optionally, the non-stick pot further comprises an outer stainless steel layer 203 and a non-stick coating layer sandwiched between the outer stainless steel layer 203 and the inner non-stick coating layer. The heat-dissipating layer between the stainless steel layers 201. The heat-dissipating layer can be made of heat-conducting metal materials such as aluminum, or can be made of a material with strong thermal conductivity. Liquid, not limited here.

[0105] Furthermore, the inner stainless steel layer 201 and / or the outer stainless steel layer 203 are made of food grade material, such as SUS304 Or SUS316L material to improve the hygiene of the pot.

[0106] Optionally, the surface of the metal protective film 206 can be processed with scale lines by laser engraving or other methods so as to Provide cooking instructions for users to add rice and water in a reasonable ratio before cooking, so as to cook better High-quality rice improves the user experience.

[0107] Furthermore, the scale line is provided with a maximum cooking rice amount, and the rice amount height corresponding to the maximum cooking rice amount is less than the The distribution height of the anti-stick array on the wall of the pot. This allows the rice grains to align with the anti-stick array when cooking. The probability of non-sticking is maximized to ensure the non-stick effect.

[0108] Optionally, the anti-sticking array is arranged to avoid the scale lines to improve the clarity of the scale lines.

[0109] It should be noted that the same or similar parts between the above embodiments can be referred to each other, and the relevant or corresponding parts between the embodiments and the method disclosed in the present invention can be referred to the description of the above method part, which will not be repeated here.

[0110] refer to Figure 6 The present invention also proposes a cooking utensil with a 0-coating non-stick pot inner shell, comprising a pot body 100, a pot cover 300 covered on the pot body 100, and a pot inner shell 200 arranged in the pot body 100, wherein the pot inner shell 200 is the 0-coating non-stick pot inner shell described in any of the above embodiments.

[0111] Specifically, the top of the pot body 100 is provided with an openable and closable cover with a pot cover 300, which can be hinged to the pot body 100 or separately provided; the pot body 100 has a cylindrical accommodating space, and the pot core 200 can be freely placed in the accommodating space or taken out from the accommodating space to facilitate its cleaning; when the pot core 200 is placed in the accommodating space and the pot cover 300 is covered on the pot body 100, the pot cover 300 and the pot core 200 jointly define a cooking cavity 230; a heating device 110 is provided in the pot body 100, and the heating device 110 is located at the bottom or side of the accommodating space. It can be a heating plate or an electromagnetic wire plate, and heats the food in the cooking cavity 230 by heating the pot core 200.

[0112] Optionally, the pot body 100 includes an inner cover and an outer cover, a cooling fan is provided between the inner cover and the outer cover, the inner cover is provided with an air outlet channel corresponding to the cooling fan, and the air outlet channel is arranged toward the pot inner body 200.

[0113] At the end of cooking, the cooling fan blows cold air to the bottom of the pot 200 in an orderly manner, and the temperature of the pot 200 is quickly reduced, thereby promoting the water vapor in the gaps of the rice to liquefy better and adhere to the groove array, which is more conducive to the formation of a water film, improves the non-stick effect of the coating, and makes it easier for users to serve rice after cooking, and is also more convenient for users to clean the inner pot.

[0114] It should be noted that the present invention does not specifically limit the positions of the cooling fan and the air outlet duct. Figure 6 The cooling fan is arranged on the side of the pot body 100, and the air outlet channel is obliquely toward the bottom of the pot inner body 200; in another specific embodiment, the cooling fan is arranged at the bottom of the pot body 100, and the air outlet channel is toward the bottom wall of the pot inner body 200, so as to directly cool the bottom wall of the pot inner body with a higher temperature, which has a better effect.

[0115] It is understandable that the cooking appliance may not adopt the above-mentioned air cooling solution, but may adopt natural cooling or other cooling methods, which are not limited here.

[0116] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A cooking utensil with a non-stick coating, comprising a pot body, a pot cover arranged on the pot body, and a pot inner portion arranged in the pot body, characterized in that: The inner pot includes at least an inner stainless steel layer that contacts the food. The inner wall of the inner stainless steel layer is provided with a groove array. The groove array is a plurality of independent grooves. The grooves include at least two grooves of different sizes. A single rice grain covers at least two grooves.

2. A cooking utensil with zero coating and non-stick properties as claimed in claim 1, characterized in that: The adjacent grooves of different sizes are arranged in an increasing or decreasing trend.

3. The cooking utensil with zero coating and non-stick properties as claimed in claim 1, characterized in that: The groove array located on the bottom wall is a first groove array, and the groove array located on the side wall is a second groove array.

4. The cooking utensil with zero coating and non-stick properties as claimed in claim 1, characterized in that: Cool the bottom of the pot while the rice is cooking.

5. The cooking utensil with zero coating and non-stick properties as claimed in claim 1, characterized in that: The pot body includes an inner cover and an outer cover, a cooling fan is provided between the inner cover and the outer cover, the inner cover is provided with an air outlet channel corresponding to the cooling fan, the air outlet channel is arranged toward the pot inner body, and an inner wall corresponding to the outer wall of the pot inner body corresponding to the air outlet channel is provided with a groove array.

6. A cooking utensil with zero coating and non-stick properties as claimed in claim 5, characterized in that: A plurality of grooves of the same shape are distributed on the inner surface of the bottom wall of the pot.

7. The cooking utensil with zero coating and non-stick properties as claimed in claim 5, characterized in that: The air outlet channel is inclined toward the bottom of the pot.

8. The cooking utensil with zero coating and non-stick properties as claimed in claim 1, characterized in that: There are partition ribs between adjacent grooves, and the width of the partition ribs is 100 to 500 microns.

9. The cooking utensil with zero coating and non-stick properties as claimed in claim 1, wherein: Partition ribs are arranged between adjacent grooves, and the grooves and partition rib areas on the inner surface of the pot are covered with a metal protective film.

10. The cooking utensil with zero coating and non-stick properties as claimed in claim 9, characterized in that: The thickness of the metal protection film is smaller than the depth of the groove.

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