Inner pot, cooking utensil and method for manufacturing inner pot

Abstract

The present invention relates to an inner pot, a cooking utensil, and a method for manufacturing the inner pot. The inner pot (100) of the present invention includes a base (110), a transition layer (120), a non-stick layer (130), and an abrasion-resistant particle layer (140). The transition layer (120) is attached to the inner surface of the base (110). The non-stick layer (130) is attached to the inner surface of the transition layer (120). The abrasion-resistant particle layer (140) is composed of a plurality of protruding particles (141) attached at intervals to the inner surface of the non-stick layer (130).

Description

[Technical Field]

[0001] The present invention relates to the technical field of cookware, and more particularly to inner pots, cookware and methods for manufacturing inner pots. [Background technology]

[0002] Currently, the surface of the inner pot of commercially available rice cookers generally uses a non-stick coating such as polytetrafluoroethylene (PTFE) coating or tetrafluoroethylene-perfluoroalkoxyvinyl ether copolymer (PFA: Polyfluoroalkoxy) coating.

[0003] However, non-stick coatings generally have problems with low hardness and scratch resistance. When the coating is scratched and peeled off during use, the non-stick properties are lost, making food more likely to stick to the pan and making cleaning difficult. Furthermore, damage to the coating can cause components such as metallic aluminum to leach out, which can have an adverse effect on human health and significantly impact customer experience.

[0004] Thus, peeling and wear of the coating on rice cooker inner pots has become a common problem throughout the industry and is one of the main causes of complaints from consumers.

[0005] Therefore, there is a need for a kettle, a cookware, and a method of manufacturing the kettle that at least partially addresses the above-mentioned problems. Summary of the Invention

[0006] The Summary of the Invention section introduces a series of simplified concepts, which will be further detailed in the specific embodiments that follow. The Summary of the Invention section of this disclosure is not intended to limit the key features and essential technical features of the protected technical solution, nor to define the protection scope of the protected technical solution.

[0007] To at least partially solve the above problems, a first aspect of the present invention discloses an inner pot for a cookware, the inner pot including a substrate, a transition layer attached to the inner surface of the substrate, a non-stick layer attached to the inner surface of the transition layer, and an abrasion-resistant particle layer composed of a plurality of protruding particles attached to the inner surface of the non-stick layer at intervals from one another.

[0008] According to the inner pot of the present invention, by disposing a layer of wear-resistant particles on the surface of the non-stick layer, the scratch resistance of the inner pot can be improved without impairing the continuity and integrity of the non-stick layer, without affecting the corrosion resistance of the inner pot, and without significantly affecting the non-stick properties.

[0009] Optionally, the thickness of the transition layer is 10 μm to 20 μm. According to this embodiment, the transition layer can function as an intermediate transition to improve the adhesive strength of the non-stick layer.

[0010] Optionally, the thickness of the non-adhesive layer is 10 μm to 60 μm, which provides good non-adhesive properties.

[0011] Optionally, the height of the protruding particles of the abrasion-resistant particle layer protruding from the inner surface of the non-adhesive layer is 10 μm to 500 μm, thereby improving abrasion resistance and increasing the number of abrasion-resistant cycles.

[0012] Optionally, the height of the protruding particles of the abrasion-resistant particle layer protruding from the inner surface of the non-adhesive layer is 20 μm to 200 μm. According to this embodiment, scratch resistance can be further improved.

[0013] Optionally, the height of the protruding particles of the abrasion-resistant particle layer protruding from the inner surface of the non-adhesive layer is 50 μm to 100 μm. According to this embodiment, scratch resistance can be further improved.

[0014] Optionally, the diameter of the protruding particles of the wear-resistant particle layer is 10 μm to 500 μm, which can improve the wear resistance of the wear-resistant particle layer while minimizing the effect on the non-adhesiveness of the non-adhesive layer.

[0015] Optionally, the diameter of the protruding particles of the wear-resistant particle layer is 50 μm to 300 μm. According to this embodiment, the number of abrasion cycles that the wear-resistant particle layer can withstand can be further improved.

[0016] Optionally, the diameter of the protruding particles of the wear-resistant particle layer is 100 μm to 200 μm. According to this embodiment, the number of abrasion cycles that the wear-resistant particle layer can withstand can be further improved.

[0017] Optionally, the ratio of the inner surface area of ​​the non-adhesive layer to the total area of ​​the contact surface between the protruding particles of the wear-resistant particle layer and the non-adhesive layer is 5% to 50%. According to the above configuration, the wear resistance of the inner pot can be improved while minimizing the effect on non-adhesiveness.

[0018] Optionally, the ratio of the inner surface area of ​​the non-stick layer to the total area of ​​the contact surface between the protruding particles of the wear-resistant particle layer and the non-stick layer is 10% to 30%. According to this embodiment, the scratch resistance of the inner pot can be improved while further suppressing the influence on non-stickiness.

[0019] Optionally, the ratio of the inner surface area of ​​the non-stick layer to the total area of ​​the contact surface between the protruding particles of the wear-resistant particle layer and the non-stick layer is 15% to 25%. According to this embodiment, the scratch resistance of the inner pot can be improved and the influence on non-stickiness can be further reduced.

[0020] Optionally, the polarity of the material of the transition layer is lower than that of the substrate and higher than that of the non-stick layer. According to the above configuration, the polarity of the material of the transition layer is intermediate between the polarity of the substrate and the polarity of the non-stick layer, so that the transition layer can form good adhesion with both the substrate and the non-stick layer, firmly adhere the non-stick layer, and reduce the possibility of peeling.

[0021] Optionally, the material polarity of the wear-resistant particle layer is higher than the material polarity of the non-stick layer. According to this embodiment, the wear-resistant particle layer is made of a selected material different from the material of the non-stick layer so as to have good scratch resistance.

[0022] Optionally, the transition layer and the non-stick layer are bonded by thermal welding. Optionally, the non-stick layer and the protruding particles of the wear-resistant particle layer are bonded by thermal welding. This configuration further improves the bonding strength between the layers, thereby improving the durability of the inner pot.

[0023] Optionally, the protruding particles of the wear-resistant particle layer are formed by molten wear-resistant material shrinking onto molten non-stick material and solidifying upon cooling, thereby achieving strong adhesion of the wear-resistant particle layer to the non-stick surface without compromising the integrity of the non-stick layer.

[0024] Optionally, the interface material of the transition layer comprises a material similar to the non-stick material of the non-stick layer, and further comprises a material added to the interface material of the transition layer configured such that the material polarity of the transition layer is lower than the material polarity of the substrate and higher than the material polarity of the non-stick layer.

[0025] Optionally, the interface material of the transition layer includes polyamide-imide (PAI) and at least one of polytetrafluoroethylene and polyfluoroalkoxy, which, according to this embodiment, are readily available and are beneficial for improving production efficiency and reducing costs.

[0026] Optionally, the non-stick material of the non-stick layer comprises at least one of polytetrafluoroethylene and polyfluoroalkoxy. According to this embodiment, these materials are readily available, which is beneficial for improving production efficiency and reducing costs.

[0027] Optionally, the non-stick material is polytetrafluoroethylene and the thickness of the non-stick layer is 10 μm to 30 μm, or the non-stick material is polyfluoroalkoxy and the thickness of the non-stick layer is 20 μm to 60 μm. According to this embodiment, an excellent non-stick effect can be obtained.

[0028] Optionally, the wear-resistant material of the wear-resistant particle layer includes at least one of polyethersulfone and polyaryletherketone. According to this embodiment, these materials are readily available, which is advantageous for improving production efficiency and reducing costs, and allows the wear-resistant particle layer to be formed with smooth, non-stick adhesion.

[0029] Optionally, the wear-resistant material of the wear-resistant particle layer is a mixture of polyethersulfone and polyaryletherketone, and the weight percentage of the polyethersulfone is 50% or more. According to this embodiment, cost reduction can be achieved.

[0030] A second aspect of the present invention discloses a cooking utensil comprising a pot body, the inner pot according to the second aspect, and a lid, wherein the inner pot is detachably disposed within the pot body, and the lid is attached to the pot body in an openable and closable manner, such that when the inner pot is disposed within the pot body and the lid is closed relative to the pot body, a cooking space is formed between the lid and the inner pot.

[0031] The cooking utensil of the present invention includes the inner pot according to the first aspect, and thereby provides the same technical effects as the inner pot according to the first aspect.

[0032] The third aspect of the present invention discloses a method for manufacturing the inner pot according to the first aspect. The method for manufacturing the inner pot includes: S1: preparing the base; S2: forming a transition layer on the substrate; S3: forming a non-stick layer and an abrasion-resistant particle layer; S3 includes steps of spraying a non-stick material onto the inside of the transition layer to form a non-stick material film, spraying a wear-resistant material onto the inside of the non-stick material film to form a wear-resistant material film, heating the non-stick material film and the wear-resistant material film to melt them together, causing the molten wear-resistant material to shrink on the molten non-stick material, and cooling and solidifying them, thereby forming a non-stick layer attached to the transition layer and a plurality of protruding particles attached to the non-stick layer.

[0033] According to the manufacturing method of the third aspect of the present invention, the wear-resistant particle layer can be firmly attached to the surface of the non-stick layer without impairing the continuity and integrity of the non-stick layer, thereby achieving the technical effect of improving the scratch resistance of the inner pot without affecting the corrosion resistance of the inner pot or significantly affecting the non-stick. Furthermore, since the non-stick layer and the wear-resistant particle layer are sintered in a single process, the number of processing steps is reduced, which is advantageous for improving production efficiency.

[0034] The fourth aspect of the present invention discloses a method for manufacturing the inner pot according to the first aspect. The method for manufacturing the inner pot includes: S1: preparing the base; S2: forming a transition layer on the substrate; S3: forming a non-stick layer and an abrasion-resistant particle layer; The S3 is S31: spraying a non-stick material on the inner side of the transition layer to form a non-stick material film, and heating the non-stick material film to melt it, and then cooling and solidifying it to form the non-stick layer; S32: Spraying an abrasion-resistant material onto the inside of the non-stick layer to form an abrasion-resistant material film, heating the non-stick material film and the non-stick-resistant layer to melt them together, causing the molten abrasion-resistant material to shrink on the molten non-stick material, and cooling and solidifying it, thereby forming a non-stick layer attached to the transition layer and the plurality of protruding particles attached to the non-stick layer.

[0035] The fourth aspect of the present invention allows the inner pot manufacturing method to firmly adhere the wear-resistant particle layer to the surface of the non-stick layer without impairing the continuity and integrity of the non-stick layer, thereby achieving the technical effect of improving the inner pot's scratch resistance without affecting the corrosion resistance or non-stick properties of the inner pot. Furthermore, the non-stick and wear-resistant particle layers are sintered in two separate processes, which improves the manufacturing success rate, improves product yield, and is advantageous in reducing production costs.

[0036] Optionally, the heating temperature is 350°C to 440°C, and the heating time is 3 minutes to 30 minutes. This embodiment can be beneficial to improving production efficiency and reducing costs. At the same time, the above conditions help adjust the surface tension of the molten wear-resistant material and the molten non-sticky material, allowing the molten wear-resistant material to better shrink on the molten non-sticky material and form a tightly adhered wear-resistant particle layer.

[0037] Optionally, the thickness of the non-stick material film is between 10 μm and 60 μm.

[0038] Optionally, the thickness of the wear-resistant material film is 5 μm to 100 μm, which is advantageous for forming protruding particles with a predetermined height and diameter.

[0039] Optionally, the thickness of the wear-resistant material film is 10 μm to 50 μm, which is more advantageous for forming protruding particles with a predetermined height and diameter.

[0040] Optionally, step S1 further includes sandblasting and / or degreasing the substrate to increase the roughness of the substrate, which can improve the adhesion strength of the transition layer.

[0041] Optionally, S2 is S21: spraying an interface material onto the substrate to form an interface material film, and setting the thickness of the interface material film to 10 μm to 20 μm; S22: Heating the interface material film at 80° C. to 200° C. for 5 minutes to 20 minutes to form the transition layer. According to this embodiment, the process is simple and low cost.

[0042] Optionally, the wear-resistant material is in the form of a powder or an aqueous dispersion with a solid content of 20% to 50%, and the particle size of the wear-resistant material is 1 μm to 5 μm, and the wear-resistant material film is formed by electrostatic spraying or pressurized spraying. This configuration allows for a simple process, low cost, and high product yield. [Brief explanation of the drawings]

[0043] The following drawings constitute part of this application and are provided to facilitate the understanding of the application. The drawings illustrate embodiments of the invention and the description serves to explain the principles of the invention.

[0044] [Figure 1] FIG. 1 is a schematic diagram of an enlarged structure of an inner pot according to a preferred embodiment of the present invention. [Figure 2] FIG. 2 is a flow chart of a method for manufacturing an inner kettle according to a preferred embodiment of the present invention. [Figure 3] FIG. 3 is a flow chart of a method for manufacturing an inner kettle according to another preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0045] In the following description, numerous specific details are set forth to facilitate a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without including some or all of these details. In other instances, some technical features that are well known in the art are omitted to avoid confusion with the present invention.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present application. As used herein, the singular forms include the plural forms unless the context clearly dictates otherwise. It should also be understood that when the terms "comprise" and / or "include" are used herein, they do not exclude the presence or addition of features, integers, steps, operations, elements, components, and / or combinations thereof.

[0047] Furthermore, ordinal numbers such as "first" and "second" used in this specification are used merely for the convenience of identification and do not imply a specific order. Furthermore, for example, the term "first member" does not by itself suggest the existence of a "second member," and similarly, the term "second member" does not presuppose the existence of a "first member." Terms indicating directions such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer" used in this specification are for illustrative purposes only and are not intended to be particularly limiting.

[0048] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0049] One aspect of the present invention discloses a cooking utensil. Generally, the cooking utensil includes a pot body and a lid. The pot body has a generally rounded rectangular shape and includes a middle plate and an outer shell connected to the underside of the middle plate, which may be integrally formed by injection molding. A cylindrical inner pot storage space is formed in the center of the middle plate, and the inner pot can be freely inserted and removed from this inner pot storage space, making cleaning of the inner pot easy. Generally, a circular opening is formed on the top surface of the inner pot for storing ingredients to be heated, such as rice or soup. The pot body is equipped with a heating device for heating the inner pot.

[0050] The lid has a shape that substantially corresponds to the shape of the pot body and is attached to the pot body so that it can be opened and closed. Specifically, the lid is drivingly connected to the pot body via a pivot shaft and can rotate relative to the pot body between an open position and a closed position around a pivot axis centered on the pivot shaft. This facilitates the opening and closing of the pot body. When the lid is closed on the pot body, the lid covers the inner pot, forming a cooking space between the lid and the inner pot.

[0051] The cooking utensil may further include a temperature sensing device. For example, it may include an upper temperature sensing device provided in the lid and / or a lower temperature sensing device provided below the inner pot storage space. The cooking utensil may further include a lid opening / closing button mechanism. The lid opening / closing button mechanism is preferably provided on the pot body and may be connected to a locking mechanism that locks the lid to the pot body via a transmission mechanism. When the lid opening / closing button is pressed, the lid can be opened automatically.

[0052] The cooking appliance includes a control device and a heating device. The control device is used to realize cooking control of the cooking appliance and may be composed of an MCU (microcontroller unit). The heating device heats the inner pot and may be composed of a coil plate. The control device and the heating device are electrically connected to realize heating control.

[0053] Both the upper and lower temperature sensing devices are electrically connected to the cooking appliance control device, and after detecting the temperature of the inner pot, feed the temperature signal back to the control device, allowing the control device to perform more precise cooking control based on the temperature signal. When the inner pot is placed in the inner pot storage space of the pot body, the lower temperature sensing device can detect the temperature of the bottom of the inner pot. For example, the lower temperature sensing device may be in direct or indirect contact with the bottom of the inner pot.

[0054] Another aspect of the present invention discloses an inner pot 100 for a cookware. As shown in Figure 1, the inner pot 100 includes a substrate 110, a transition layer 120, a non-stick layer 130, and an abrasion-resistant particle layer 140. The transition layer 120 is attached to the inner surface of the substrate 110. The non-stick layer 130 is attached to the inner surface of the transition layer 120. The abrasion-resistant particle layer 140 is composed of a plurality of protruding particles 141 attached at intervals to the inner surface of the non-stick layer 130.

[0055] According to the inner pot 100 of the present invention, by arranging the plurality of protruding particles 141 of the wear-resistant particle layer 140 on the surface of the non-stick layer 130, the scratch resistance of the inner pot 100 can be improved without impairing the continuity and integrity of the non-stick layer 130 or significantly affecting the corrosion resistance and non-stick properties of the inner pot 100.

[0056] The substrate 110 may be made from aluminum, steel, or other materials to provide high structural strength.

[0057] The non-adhesive material of the non-adhesive layer 130 can be selected from at least one of polytetrafluoroethylene and polyfluoroalkoxy. This provides excellent non-adhesive performance. The thickness of the non-adhesive layer 130 is preferably 10 μm to 60 μm to obtain good non-adhesive properties. In an optional embodiment, when the non-adhesive material is polytetrafluoroethylene, the thickness of the non-adhesive layer 130 is 10 μm to 30 μm. Alternatively, when the non-adhesive material is polyfluoroalkoxy, the thickness of the non-adhesive layer 130 is 20 μm to 60 μm.

[0058] The interface material of the transition layer 120 can be selected as polyamideimide (PAI) and at least one of polytetrafluoroethylene and polyfluoroalkoxy. Selecting a material similar to that of the non-stick layer 130 can enhance compatibility between the transition layer 120 and the non-stick layer 130. Meanwhile, adding polyamideimide increases the polarity of some of the materials in the transition layer 120, adjusting the material polarity of the transition layer 120 to be intermediate between that of the substrate 110 and the non-stick layer 130. That is, the material polarity of the transition layer 120 is lower than that of the substrate 110 and higher than that of the non-stick layer 130. This allows the material polarity of the transition layer 120 to be intermediate between that of the substrate 110 and that of the non-stick layer 130, enabling the transition layer 120 to adhere well to both the substrate 110 and the non-stick layer 130. This further allows the non-stick layer 130 to adhere firmly and reduce the possibility of peeling. Preferably, water and pigment paste are added to the interface material to improve sprayability and to help adjust the polarity of the material.The thickness of the transition layer 120 is preferably 10 μm to 20 μm.

[0059] The material polarity of the wear-resistant particle layer 140 is preferably higher than that of the non-adhesive layer 130. In this way, by using a material different from that of the non-adhesive layer 130 for the wear-resistant particle layer 140, the protruding particles 141 of the wear-resistant particle layer 140 have excellent scratch resistance. For example, at least one of polyethersulfone (PES) and polyaryletherketone (PAEK) can be selected as the wear-resistant material for the wear-resistant particle layer 140. When a mixture of PES and PAEK is used as the wear-resistant material, the PES content is preferably 50% or more.

[0060] Because the material polarity of the non-stick layer 130 is relatively low, it is generally difficult to place other parts or components on the surface of the non-stick layer 130. Therefore, the protruding particles 141 of the wear-resistant particle layer 140 are formed by heating and melting the wear-resistant material, causing it to shrink onto the molten non-stick material, and then cooling and solidifying it. This allows the protruding particles 141 of the wear-resistant particle layer 140 to be firmly attached to the surface of the non-stick layer 130 without compromising the integrity of the non-stick layer 130. In other words, the transition layer 120 and the non-stick layer 130 are bonded together by thermal welding, and the non-stick layer 130 and the protruding particles 141 of the wear-resistant particle layer 140 are also bonded together by thermal welding.

[0061] Specifically, the non-stick material has low material polarity, while the wear-resistant material has relatively high material polarity. In other words, the non-stick material has low surface energy, while the wear-resistant material has high surface energy. During manufacturing, when the non-stick material and the wear-resistant material are both heated and melted, the surface tension of the molten non-stick material is lower than that of the molten wear-resistant material. Because the molten wear-resistant material does not easily wet and spread on the surface of the molten non-stick material, the molten wear-resistant material shrinks on the surface of the molten non-stick material, forming small protrusions with smoothly transitioning curved or spherical protrusions. After both the molten non-stick material and the molten wear-resistant material cool and solidify, a wear-resistant particle layer 140 consisting of multiple protrusion particles 141 thermally bonded to the surface of the non-stick layer 130 is formed.

[0062] The magnitude of the material polarity can be evaluated by various methods, such as evaluation based on the difference in surface energy of the solid material, evaluation based on the difference in solubility parameter of the material, or evaluation based on the difference in surface tension of the liquid material.

[0063] For example, contact angles can be used to characterize the polarity and surface energy of a material. For example, if the contact angle formed by water on a non-stick material is larger than the contact angle formed by water on an abrasion-resistant material, this indicates that the surface energy of the non-stick material is lower than that of the abrasion-resistant material. Conversely, if the contact angle formed by water on a non-stick material is smaller than the contact angle formed by water on an abrasion-resistant material, this indicates that the surface energy of the non-stick material is higher than that of the abrasion-resistant material. Preferably, the surfaces of the non-stick and abrasion-resistant materials should have similar roughness during testing.

[0064] Furthermore, the protruding particles 141 of the wear-resistant particle layer 140 have a height h (see FIG. 1) of 10 μm to 500 μm, preferably 20 μm to 200 μm, and more preferably 50 μm to 100 μm, protruding from the surface of the non-adhesive layer 130. The protruding particles 141 of the wear-resistant particle layer 140 have a diameter d (see FIG. 1) of 10 μm to 500 μm, preferably 50 μm to 300 μm, and more preferably 100 μm to 200 μm. This improves wear resistance and increases the number of cycles of durability (scratch resistance).

[0065] The ratio of the total area of ​​the contact surface between the protruding particles 141 of the wear-resistant particle layer 140 and the non-stick layer 130 to the surface area of ​​the inner surface of the non-stick layer 130 is 5% to 50%, preferably 10% to 30%, and more preferably 15% to 25%. According to this embodiment, the scratch resistance of the inner kettle 100 can be further improved while suppressing the influence on non-stickiness.

[0066] The wear resistance of the inner kettle 100 of the present invention will be described below based on the test results in Table 1.

[0067] In the comparative example shown in Table 1, neither the non-adhesive layer 130 nor the wear-resistant particle layer 140 is provided. In Examples 1 to 8, the height h and diameter d of the protruding particles 141 are set to be different.

[0068] The test procedure is as follows: the sample is fixed to the abrasion resistance tester, and a 0.5% aqueous detergent solution is added to wet the abrasion surface under a pressure of 45 N. An abrasion cycle test is then carried out using a 3M-7447C polishing pad, with the polishing pad replaced with a new one every 500 cycles. The test is terminated when 10 linear exposures of the substrate occur, or when local scratches develop into widespread or total peeling, and the maximum number of abrasion cycles is recorded.

[0069] [Table 1]

[0070] In another aspect of the present invention, there is provided a manufacturing method for the inner pot 100 for manufacturing the above-mentioned inner pot 100. The manufacturing method for the inner pot 100 includes the following steps.

[0071] S1: Prepare the substrate 110. Step S1 specifically includes sandblasting and / or degreasing the substrate 110 to increase the roughness of the substrate 110. This configuration can improve the adhesion of the transition layer 120.

[0072] S2: Prepare a transition layer 120 on the substrate 110. Step S2 specifically includes: S21: spray-coating an interface material film on the substrate 110 to form an interface material film having a thickness of 10 μm to 20 μm; and S22: heating the interface material film at 80°C to 200°C for 5 minutes to 20 minutes to form the transition layer 120. According to this embodiment, the steps are simplified and costs can be reduced.

[0073] S3: The non-stick layer 130 and the wear-resistant particle layer 140 are prepared.

[0074] In any embodiment of the manufacturing method for the inner pot 100 of the present invention, step S3 includes spraying a non-stick material onto the inside of the transition layer 120 to form a non-stick material film, then spraying an abrasion-resistant material film onto the inside of the non-stick material film to form an abrasion-resistant material film, and then heating and melting the non-stick material film and the abrasion-resistant material film together, causing the molten abrasion-resistant material to shrink on the molten non-stick material and then cooling and solidifying, thereby forming a non-stick layer 130 attached to the transition layer 120 and a plurality of protrusion particles 141 attached to the non-stick layer 130.

[0075] According to the manufacturing method of the inner pot 100 of any embodiment of the present invention, the wear-resistant particle layer 140 can be firmly attached to the surface of the non-stick layer 130 without impairing the continuity and integrity of the non-stick layer 130, thereby achieving the technical effect of improving the scratch resistance of the inner pot 100 without affecting the corrosion resistance or non-stick properties of the inner pot 100. Furthermore, the non-stick layer 130 and the wear-resistant particle layer 140 are sintered and formed in a single process, which reduces processing steps and contributes to improving production efficiency.

[0076] In another optional embodiment of the manufacturing method for the inner kettle 100 of the present invention, S3 includes the following steps S31 and S32.

[0077] S31: A non-stick material is sprayed onto the inside of the transition layer 120 to form a non-stick material film, the non-stick material film is melted by heating, and the melted non-stick material is cooled and solidified to form a non-stick layer 130.

[0078] S32: After spraying an abrasion-resistant material onto the inside of the non-stick layer 130 to form an abrasion-resistant material film, the non-stick layer 130 and the abrasion-resistant material film are heated to melt together, and the molten abrasion-resistant material shrinks on the melted non-stick material and cools to solidify, thereby forming the non-stick layer 130 attached to the transition layer 120 and a plurality of protrusion particles 141 attached to the non-stick layer 130.

[0079] According to the method for manufacturing the inner pot 100 of the above-mentioned optional embodiment of the present invention, the wear-resistant particle layer 140 can be firmly attached to the surface of the non-stick layer 130, provided that the continuity and integrity of the non-stick layer 130 is not impaired, thereby achieving the technical effect of improving the scratch resistance of the inner pot 100 without affecting the corrosion resistance or non-stick properties of the inner pot 100. In addition, the non-stick layer 130 and the wear-resistant particle layer 140 are sintered in two stages, which improves the success rate of manufacturing, improves yield, and is advantageous in reducing manufacturing costs.

[0080] In the two manufacturing methods described above, the heating (or sintering) temperature is 350°C to 440°C, and the heating (or sintering) time is 3 to 30 minutes. This improves production efficiency and is beneficial for reducing production costs. At the same time, the above conditions help adjust the surface tension of the molten wear-resistant material and the molten non-stick material, allowing the molten wear-resistant material to better shrink on the molten non-stick material and form a firmly adhered wear-resistant particle layer 140.

[0081] In step S3, the thickness of the non-stick material film sprayed is 10 μm to 60 μm, and the thickness of the wear-resistant material film sprayed is 5 μm to 100 μm, which is useful for forming the wear-resistant particle layer 140 with a predetermined height and diameter.

[0082] The wear-resistant material is in the form of a powder or an aqueous dispersion with a solid content of 20% to 50%, and the particle size of the wear-resistant material is 1 μm to 5 μm. These wear-resistant material films are preferably formed by electrostatic spraying or pressurized spraying. This simplifies the process, reduces costs, and improves productivity.

[0083] The above-mentioned two preparation methods will be described in more detail below with reference to FIGS. 2 and 3.

[0084] As shown in FIG. 2, in a preferred embodiment of the preparation method, the substrate 110 is first subjected to pretreatments such as sandblasting and degreasing. Next, an interface material is sprayed onto the surface of the substrate 110 to form a uniformly thick interface material film, with a thickness of 10 μm to 20 μm. Next, the interface material film is dried to prepare for the next step. Preferred drying conditions are a drying temperature of 80°C to 200°C and a drying time of 5 to 20 minutes. This forms the transition layer 120.

[0085] Next, a non-stick material is sprayed onto the surface of the transition layer 120 to form a non-stick material film with a uniform thickness. When PTFE is used as the non-stick material, the thickness of the non-stick material film is preferably 10 μm to 30 μm. When PFA is used as the non-stick material, the thickness of the non-stick material film is preferably 20 μm to 60 μm. The non-stick material may be a powder paint or a liquid paint, and the spraying method may be a powder electrostatic spray method, an air pressure spray method, a liquid electrostatic spray method, or the like.

[0086] Next, a first sintering is performed to form a dense non-adhesive layer 130. Preferred sintering conditions are as follows: when PTFE is used as the non-adhesive material, the sintering temperature is 380°C to 440°C and the sintering time is 3 to 5 minutes; when PFA is used as the non-adhesive material, the sintering temperature is 380°C to 420°C and the sintering time is 5 to 30 minutes.

[0087] Then, an abrasion-resistant material such as a PES material is sprayed onto the surface of the formed non-adhesive layer 130 to form a certain thickness of the abrasion-resistant material film, the thickness of which is 5 μm to 100 μm, preferably 10 μm to 50 μm. The abrasion-resistant material may be a powder paint or a liquid paint, and the spraying method may be a powder electrostatic spraying method, a liquid pneumatic spraying method, a liquid electrostatic spraying method, or the like.

[0088] Finally, a second sintering step is performed to simultaneously melt the non-stick coating layer (e.g., PFA) and the abrasion-resistant material layer (e.g., PES). Due to the difference in surface tension, the surface tension of molten PFA is low, while that of molten PES is relatively high. As a result, the molten PES condenses on the surface of the PFA, forming a particle shape with a predetermined protrusion. At the same time, the PFA and PES melt together at their contact surfaces, forming a thermally bonded interface with high adhesive strength. As a result, the PES protrusion particles do not easily peel off after cooling and solidification. The conditions for the secondary sintering described herein are a sintering temperature of 350°C to 430°C and a sintering time of 3 to 20 minutes. Preferred conditions for the secondary sintering are a sintering temperature of 380°C to 400°C and a sintering time of 5 to 10 minutes.

[0089] As shown in FIG. 3, in a preferred embodiment according to another preparation method, the substrate 110 is first subjected to pretreatments such as sandblasting and degreasing. Next, an interface material is sprayed onto the surface of the substrate 110 to form an interface material film with a uniform thickness, with the film thickness being 10 μm to 20 μm. The interface material film is then dried to prepare for the next step, which is to form the transition layer 120.

[0090] Next, a non-stick material is sprayed onto the surface of the transition layer 120 to form a non-stick material film with a certain thickness. When PTFE is used as the non-stick material, the film thickness is preferably 10 μm to 30 μm. When PFA is used as the non-stick material, the film thickness is preferably 20 μm to 60 μm. The non-stick material may be powder paint or liquid paint, and the spraying method may be powder electrostatic spraying, pressurized air spraying, liquid electrostatic spraying, etc.

[0091] Next, an abrasion-resistant material is sprayed directly onto the surface of the non-stick material film to form an abrasion-resistant material film of a certain thickness, which is 5 μm to 100 μm, preferably 10 μm to 50 μm. The abrasion-resistant material may be a powder paint or a liquid paint, and the spraying method may be powder electrostatic spraying, liquid pneumatic spraying, liquid electrostatic spraying, etc.

[0092] Finally, a single sintering process is performed to simultaneously melt the non-stick material film (e.g., PTFE) and the wear-resistant material film (e.g., PES). Due to the difference in surface tension, the surface tension of molten PTFE is low, while that of molten PES is relatively high. The molten PES condenses on the surface of the PTFE, forming a particle shape with a predetermined protrusion. At the same time, the PTFE and PES melt together at their contact surfaces, forming a thermally bonded interface with high adhesive strength. As a result, the PES protrusion particles do not easily peel off after cooling and solidification. The sintering conditions used in this specification are a sintering temperature of 350°C to 430°C and a sintering time of 3 to 20 minutes. Preferred sintering conditions are a sintering temperature of 380°C to 430°C and a sintering time of 3 to 20 minutes.

[0093] Although the inner pot described above is the inner pot of a cooking utensil, it should be understood that the technical concept of the present invention is not limited to this and can be appropriately applied to other types of non-stick cooking utensils such as non-stick woks and frying pans.

[0094] The processes and steps described in all the above preferred embodiments are merely presented as examples. The processes may be performed in a different order from the above steps unless there is a particular adverse effect. In addition, the order of steps in the above processes may be increased, combined, or omitted according to actual needs.

[0095] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are for describing particular embodiments and are not intended to limit the present invention. In this specification, a feature described in one embodiment can be applied to other embodiments alone or in combination with other features, unless the feature is inapplicable to other embodiments or is clearly specified.

[0096] The present invention has been described through the above embodiments. However, these examples are provided for the purpose of illustration and description only, and the present invention is not limited thereto. Based on the teachings of the present invention, various variations and modifications can be made by those skilled in the art, and all of these variations and modifications are included in the scope of protection claimed in this application. [Explanation of symbols]

[0097] 100 Inner pot 110 Substrate 120 Transition layer 130 Non-adhesive layer 140 Wear-resistant particle layer 141 Protrusion particles

Claims

1. An inner pot (100) for use in a cooking utensil, a substrate (110); a transition layer (120) attached to the inner surface of the substrate (110); a non-stick layer (130) attached to the inner surface of the transition layer (120); and an abrasion-resistant particle layer (140) composed of a plurality of protruding particles (141) attached to the inner surface of the non-stick layer (130) at intervals from one another.

2. The inner kettle (100) according to claim 1, wherein the thickness of the transition layer (120) is 10 μm to 20 μm.

3. The inner kettle (100) according to claim 1 or 2, characterized in that the thickness of the non-stick layer (130) is 10 μm to 60 μm.

4. The inner kettle (100) according to any one of claims 1 to 3, characterized in that the height (h) of the protruding particles (141) of the wear-resistant particle layer (140) protruding from the inner surface of the non-stick layer (130) is 10 μm to 500 μm.

5. The inner kettle (100) according to claim 4, characterized in that the height (h) of the protruding particles (141) of the wear-resistant particle layer (140) protruding from the inner surface of the non-stick layer (130) is 20 μm to 200 μm.

6. The inner kettle (100) according to claim 5, characterized in that the height (h) of the protruding particles (141) of the wear-resistant particle layer (140) protruding from the inner surface of the non-stick layer (130) is 50 μm to 100 μm.

7. The inner kettle (100) according to any one of claims 1 to 6, characterized in that the diameter (d) of the protruding particles (141) of the wear-resistant particle layer (140) is 10 μm to 500 μm.

8. The inner kettle (100) according to claim 7, characterized in that the diameter (d) of the protruding particles (141) of the wear-resistant particle layer (140) is 50 μm to 300 μm.

9. The inner kettle (100) according to claim 8, characterized in that the diameter (d) of the protruding particles (141) of the wear-resistant particle layer (140) is 100 μm to 200 μm.

10. The inner kettle (100) according to any one of claims 1 to 9, characterized in that the ratio of the total area of ​​the contact surface between the protruding particles (141) of the wear-resistant particle layer (140) and the non-stick layer (130) to the inner surface area of ​​the non-stick layer (130) is 5% to 50%.

11. The inner kettle (100) according to claim 10, characterized in that the ratio of the total area of ​​the contact surface between the protruding particles (141) of the wear-resistant particle layer (140) and the non-stick layer (130) to the inner surface area of ​​the non-stick layer (130) is 10% to 30%.

12. The inner kettle (100) according to claim 11, characterized in that the ratio of the total area of ​​the contact surface between the protruding particles (141) of the wear-resistant particle layer (140) and the non-stick layer (130) to the inner surface area of ​​the non-stick layer (130) is 15% to 25%.

13. The inner pot (100) according to any one of claims 1 to 12, characterized in that the material polarity of the transition layer (120) is lower than the material polarity of the substrate (110) and higher than the material polarity of the non-stick layer (130).

14. The inner kettle (100) according to claim 13, characterized in that the transition layer (120) and the non-stick layer (130) are joined together by thermal welding.

15. The inner kettle (100) according to any one of claims 1 to 14, characterized in that the material polarity of the wear-resistant particle layer (140) is higher than the material polarity of the non-stick layer (130).

16. The inner kettle (100) according to claim 15, characterized in that the non-stick layer (130) and the protruding particles (141) of the wear-resistant particle layer (140) are joined together by thermal welding.

17. The inner kettle (100) according to claim 16, characterized in that the protruding particles (141) of the wear-resistant particle layer (140) are formed by a molten wear-resistant material shrinking on a molten non-stick material and solidifying upon cooling.

18. The inner pot (100) of any one of claims 1 to 17, characterized in that the interface material of the transition layer (120) comprises a material similar to the non-stick material of the non-stick layer (130), and further characterized in that a material is added to the interface material of the transition layer (120) so that the material polarity of the transition layer (120) is lower than the material polarity of the substrate (110) and higher than the material polarity of the non-stick layer (130).

19. 20. The inner kettle (100) of claim 18, wherein the interface material of the transition layer (120) comprises polyamideimide and at least one of polytetrafluoroethylene and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.

20. The inner kettle (100) according to any one of claims 1 to 19, characterized in that the non-stick material of the non-stick layer (130) comprises at least one of polytetrafluoroethylene and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.

21. The inner pot (100) according to claim 20, characterized in that the non-stick material is polytetrafluoroethylene and the thickness of the non-stick layer (130) is 10 μm to 30 μm, or the non-stick material is tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer and the thickness of the non-stick layer (130) is 20 μm to 60 μm.

22. The inner kettle (100) according to any one of claims 1 to 21, characterized in that the wear-resistant material of the wear-resistant particle layer (140) comprises at least one of polyethersulfone and polyaryletherketone.

23. 23. The inner kettle (100) according to claim 22, wherein the wear-resistant material of the wear-resistant particle layer (140) is a mixture of polyethersulfone and polyaryletherketone, and the mass percentage of polyethersulfone is 50% or more.

24. It is a cooking utensil The pot body and An inner pot (100) according to any one of claims 1 to 23, which is detachably disposed in the pot body; and a lid body that is attached to the pot body so as to be openable and closable, and that forms a cooking space between the lid body and the inner pot (100) when the inner pot (100) is placed in the pot body and the lid body is closed to the pot body. Cooking utensils.

25. A method for manufacturing the inner kettle (100) according to any one of claims 1 to 23, S1: preparing the substrate (110); S2: forming the transition layer (120) on the substrate (110); S3: forming the non-stick layer (130) and the wear-resistant particle layer (140); S3 includes the steps of spraying a non-stick material onto the inside of the transition layer (120) to form a non-stick material film, spraying an abrasion-resistant material onto the inside of the non-stick material film to form an abrasion-resistant material film, heating the non-stick material film and the abrasion-resistant material film to melt them together, shrinking the molten abrasion-resistant material on the molten non-stick material, and cooling and solidifying the abrasion-resistant material, thereby forming the non-stick layer (130) attached to the transition layer (120) and the plurality of protrusion particles (141) attached to the non-stick layer (130). A method for manufacturing an inner pot (100).

26. A method for manufacturing an inner kettle (100) used to manufacture the inner kettle (100) according to any one of claims 1 to 23, S1: preparing the substrate (110); S2: forming the transition layer (120) on the substrate (110); S3: forming the non-stick layer (130) and the wear-resistant particle layer (140); The S3 is S31: spraying a non-stick material on the inner side of the transition layer (120) to form a non-stick material film, and then heating the non-stick material film to melt it and then cooling it to solidify it, thereby forming the non-stick layer (130); S32: Spraying an abrasion-resistant material onto the inside of the non-stick layer (130) to form an abrasion-resistant material film, heating the non-stick material film and the non-stick layer (130) to melt them together, shrinking the molten abrasion-resistant material onto the molten non-stick material, and cooling and solidifying the abrasion-resistant material to form the non-stick layer (130) attached onto the transition layer (120) and the plurality of protrusion particles (141) attached onto the non-stick layer (130). A method for manufacturing an inner pot (100).

27. The manufacturing method of the inner pot (100) according to claim 25 or 26, characterized in that the heating temperature is 350°C to 440°C and the heating time is 3 minutes to 30 minutes.

28. The method for manufacturing an inner pot (100) according to any one of claims 25 to 27, characterized in that the thickness of the non-stick material film is 10 μm to 60 μm, and the thickness of the wear-resistant material film is 5 μm to 100 μm.

29. The method for manufacturing an inner pot (100) according to claim 28, characterized in that the thickness of the wear-resistant material film is 10 μm to 50 μm.

30. The method for manufacturing an inner pot (100) according to any one of claims 25 to 29, characterized in that step S1 further comprises subjecting the substrate (110) to sandblasting and / or degreasing treatment to increase the roughness of the substrate (110).

31. The S2 is S21: spraying an interface material onto the substrate (110) to form an interface material film, and the thickness of the interface material film is 10 μm to 20 μm; S22: Heating the interface material film at 80°C to 200°C for 5 minutes to 20 minutes to form the transition layer (120).

32. The method for manufacturing an inner pot (100) according to any one of claims 25 to 31, characterized in that the wear-resistant material is in the form of a powder or an aqueous dispersion with a solid content of 20% to 50%, the particle size of the wear-resistant material is 1 μm to 5 μm, and the wear-resistant material film is formed by electrostatic spraying or pressurized spraying.

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