CN100473310C - Electric rice cooker - Google Patents
Electric rice cooker Download PDFInfo
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- CN100473310C CN100473310C CNB2005100743895A CN200510074389A CN100473310C CN 100473310 C CN100473310 C CN 100473310C CN B2005100743895 A CNB2005100743895 A CN B2005100743895A CN 200510074389 A CN200510074389 A CN 200510074389A CN 100473310 C CN100473310 C CN 100473310C
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Abstract
The present invention provided a cookware equipped with a pot, a plate or an inner chamber for cooking having a fluoroplastic coat formed on an inner surface of a base material, wherein abrasion resistance can be improved without making the fluoroplastic coat thick, a high anti-cohesion capacity against a cooking item is secured and the visibility of a display processed on a priming of the fluoroplastic coat can be secured sufficiently. The fluoroplastic coat 14 is formed on the inner surface of the base material and silicone carbide, diamond or mixed particles of the above are unevenly distributed at a surface layer side in a topcoat 17 of the fluoroplastic coat 14 as additive particles 18. Also, a clear layer 19 wherein the additive particles 18 of silicone carbide or diamond are absolutely or almost nonexistent is disposed at a bottom layer side of the topcoat 17.
Description
Technical field
The present invention relates to a kind of electric cooker, the matrix inner surface of employed pot is provided with the fluoride resin layer in this electric cooker.
Background technology
In the cooking devices of widely selling in the market such as electric cooker, the matrix material of wherein employed pot mainly is simple aluminium, and the composites such as laminated material with aluminium and stainless laminated material, aluminium and stainless steel and copper that also have are used as matrix material.
In these metal electric cooker pots, cling on pot in order to prevent gratin (being generally rice), generally all be provided with the fluoride resin layer on its inner surface, to improve release property for rice.
The fluoride resin layer that is arranged on the inner surface of pot usually adopts 1 layer, 2 layers or 3 layers of structure, from realizing the angle of good release property, high-durability and aesthetic appearance, the fluoride resin layer more than 2 layers or 2 layers is set preferably.
When adopting 2 layers of fluoride resin layer,, make matrix obtain the surface roughness of appropriateness earlier to processing such as matrix sandblast; Then,, be coated with the thickness that applies after the film forming more above it and be the top layer before and after the 50 μ m,, form the fluoride resin layer at last in about 20 minutes film forming of 400 ℃ of left and right sides sintering at the thickness adhesive linkage before and after the 10 μ m, that be called bottom that is coated with on the matrix after applying film forming.
Except fluoride resin, also contain adhering resin and pigment, gloss material in the bottom, therefore, except having binding function, can also play the effect that presents desirable color and reflecting feel.In addition, polytetrafluoroethylene (PTFE), polytetrafluoroethylene (PTFE)=perfluoroalkyl vinyl ether polymer (PFA), polytetrafluoroethylene (PTFE)=hexafluoroethylene polymer fluoride resins such as (FEP) be can be used alone or as a mixture in the top layer, pigment and gloss material also are being added with on these fluoride resins under some occasion.But, when the additive amount that adds in the top layer is too many, can make the release property deterioration.Therefore, under the situation of using the pot in electric cooker, top layer uses pure fluoride resin usually, perhaps only adds the extremely pigment and the gloss material of trace.
In addition, in the pot that uses in electric cooker, also be provided with waterline sign part in the pot, wherein carry out the watermark of water yield adjusting according to the rice amount for the user except indicating, also be printed on some other literal, numeral and mark etc., these symbols are printed directly on the inner surface of pot usually.Under the occasion that adopts 2 layers of fluoride resin layer, earlier using waterline mark part on the color printing different on the bottom, transparent top layer is set thereon more mostly with bottom.Adopt after this structure, can avoid being coupled with on the waterline mark part physical load such as wearing and tearing, and because the top layer that is arranged on the waterline mark part is transparent, the observability of waterline also can guarantee.
But, being doped with additive if be coated in the top layer on the waterline mark part, these additives can be lived light trap, make the observability variation of waterline mark.On this meaning, preferably do not mix additive in the top layer as much as possible yet.
Narrated the situation when adopting 2 layers of fluoride resin layer above.Under 3 layers occasion, be in coating, after the bottom, to apply the intermediate layer again, be coated with above it again and apply top layer.With the same in 2 layers of coating structure, in order to guarantee the observability of release property and waterline mark part, additives such as pigment that adds in the top layer and gloss material generally also will reduce as much as possible.On the other hand, do not guarantee release property owing to the purpose that inter coat is set lies in, therefore what can add some additives.
Here, the key property of fluoride resin layer is analyzed.Guarantee that the release property of rice and the observability of waterline are important aspect really, but the situation when examining actual use can be found, be used for the rice in the electric cooker pot is rubbed with the hands, washed that is when washing rice, the grain of rice may be pressed on the fluoride resin layer tightly, and it is added very strong load; When pot is cleaned, abrasiveness cleaning means such as nylon bruss also will add very strong friction load etc. to it.Therefore, it must be borne in mind that the fluoride resin layer often is under the very high abrasion environment.
Under the occasion of the fluoride resin layer that in pan etc., uses, as the way that improves mar proof, the general materials such as a large amount of ceramic particles, inorganic filling material that are added in top layer are to improve the hardness (example wherein can be opened communique 2001-No. 218684 with reference to the Japanese patent gazette spy) of top layer.But, in the fluoride resin layer that in the electric cooker pot, uses,, be difficult to adopt above-mentioned scheme owing to will guarantee the observability of release property and waterline mark part.
For this reason, in existing electric cooker pot etc., the method for the mar proof of the raising fluoride resin layer that is adopted is, makes top layer realize thick filmization as far as possible, improves mar proof by increasing thickness.The method of thick filmization is to be coated with the powdery paints that applies thick fluoride resin, makes it the degree of reaching capacity.In addition, aforesaid midcoat thickness is also thickeied, realize the addition effect with the thickness of top layer.
Under the normal condition, the thickness of fluoride resin layer is about 30～50 μ m, can reach about 100 μ m after adopting above-mentioned thick film method, is expected to improve mar proof by thickness.
As mentioned above, the fluoride resin layer on the employed pot possesses very high release property in the electric cooker in order to make, and make waterline wherein have good observability and very high functions such as mar proof, can not contain pottery etc. in the top layer and add materials, and the fluoride resin layer need be made the thick film of 100 μ m.
But fluoride resin is the very high raw material of cost, in that electric cooker, in order to reduce manufacturing cost, is needed to suppress its use amount under the mass-produced occasion as industrial products, makes thickness attenuation as much as possible.
For the thickness that suppresses the fluoride resin layer makes its attenuation, a kind of method is the material that adds a large amount of high rigidity in top layer.But when the additive amount in the top layer was able to produce the degree that improves the mar proof effect, as previously described, release property will deterioration, and the observability of waterline also will worsen.Like this, the function as the pot that uses in electric cooker just can not fully realize.
In addition, be coated with in the electric cooker pot under the occasion that applies the fluoride resin layer, because the fluoride resin layer itself has very strong repellency, when adding the laggard row heating of entry in pot, the bubble of generation is difficult to break away from from the fluoride resin laminar surface, and has the tendency of continuous increase.Therefore, heat is difficult for being delivered in the interior water of pot, is difficult for producing good convection current.And the process of the cooking heat conduction that to be the convection current by water originally produce is Mi Jiare, and therefore, convection current can not be carried out smoothly, just has part that is fully heated and the part that is not fully heated in the rice in the pot, can produce the phenomenon of the ripe degree inequality of cooking a meal.
Summary of the invention
The present invention is intended to solve the above-mentioned problems in the prior art, its purpose is to provide the pot that uses in a kind of electric cooker, this pot needn't increase thickness and just can improve mar proof, and, can keep the release property to rice, the mark that is printed in the bottom of fluoride resin layer also can guarantee sufficient observability.In addition, the heat transmission from the fluoride resin aspect to water also can successfully be carried out, and convection current also can be carried out swimmingly, can carry out uniform heating to the rice in the pot, eliminates the phenomenon of boiling the degree inequality.
To achieve these goals, be formed with the fluoride resin layer on the matrix inner surface of electric cooker pot of the present invention, silicon-carbide particles, diamond particle or these mixtures of material that adds as additive in the top layer internal bias of fluoride resin layer on one side of top layer; Bottom in described top layer then is provided with fully or the pure layer of silicon carbide-containing and adamantine additive particulate hardly.
Like this, on being provided with pot, heating plate or heating clamber and these pots, heating plate or heating clamber, be provided with in the cooking device of fluoride resin layer, needn't increase thickness significantly and just can realize very high mar proof, and also can fully guarantee for the release property of gratin, the observability of typographic(al) mark on the bottom.
The technique effect that the present invention produces is as follows.In electric cooker pot of the present invention, top layer internal bias by the carborundum that will add as additive and the fluoride resin layer of diamond particle in matrix is one side on the top layer, needn't increase thickness significantly and just can realize very high mar proof and excellent durability, and also can be guaranteed fully the release property of gratin and the observability of waterline.
Below the specific embodiment of the present invention is summarized as follows.Be provided with a pot for cooking rice in the electric cooker in the 1st scheme, the inner surface of the matrix of described pot is provided with the fluoride resin layer, wherein, as at least a top layer internal bias at described fluoride resin layer in the carborundum of additive and the diamond particle on the top layer one side, simultaneously, lower floor's one side in the described top layer is provided with the pure layer that does not contain described additive particulate.Like this, owing to have the carborundum and the diamond particle that are biased in the top layer top layer as additive, not only can improve mar proof, simultaneously owing to just near the top layer of top layer inside, there is the lower additive of concentration, release property to gratin can be kept, and the visible light permeability of top layer is also very high.Therefore, the observability that is printed on the mark part on the bottom is fine, and corrosion resistance also can be kept.
In addition, fluoride resin has extremely low pyroconductivity, and diamond has high heat conductivity, therefore, particularly diamond particle is being used as under the occasion of additive particulate, diamond particle will become boiling nuclear, constitute the heat release point, be easy to generate tiny bubble during heating.Like this, can produce good convection current in the water in the pot, can eliminate the degree of the boiling uneven phenomenon in the pot, can guarantee the good performance of cooking.
The 2nd scheme is, in the 1st above-mentioned scheme, the amount of carborundum that is biased in the top layer side of top layer inside as the additive particulate is per 1 square metre of 0.1～1g.Be biased in top layer one side of top layer inside by the additive in this scope, not only can keep very high release property for rice, the visible light permeability of top layer is also kept very highly simultaneously.Therefore, the observability that is printed on the mark part on the bottom is very good, and mar proof also can be improved.
The 3rd scheme is that in the 1st above-mentioned scheme, the adamantine amount that is biased in the top layer side of top layer inside as the additive particulate is per 1 square metre of 0.01～1g.Be biased in top layer one side of top layer inside by the additive in this scope, not only can keep very high release property for rice, the visible light permeability of top layer is also kept very highly simultaneously.Therefore, the observability that is printed on the mark part on the bottom is very good, and mar proof also can be improved.
The 4th scheme is that in any scheme in above-mentioned the 1st～3 scheme, the carborundum or the adamantine average grain diameter that are biased in the top layer side of top layer inside as the additive particulate are 3～50% of top layer thickness.Be in this size range by the particle diameter that makes the additive particulate, the additive particulate will become and accumulate in easily near the top layer of top layer inside, can give play to advantages of good abrasion, simultaneously can prevent that the additive particulate from connecting whole top layer, thereby do one's utmost to prevent that corrosion such as moisture and flavoring from promoting material to arrive at the additive particulate, arrive the depths in the fluorinated coating, realize the electric cooker pot that a kind of corrosion resistance is very high.
The 5th scheme is, in the arbitrary scheme in the above-mentioned the 1st～4, the additive particulate by the fluoride resin powder wrapped after and the stacking top that is added in described pure layer that the powdery paints coating that forms forms, thereby make the additive particulate be biased in the top layer side of top layer inside.After above-mentioned " particulate parcel " processing, the additive particulate becomes the state that is wrapped in the fluoride resin powder, so when coating fluoride resin powdery paints, both can not separate, and always can access the uniform coating that contains certain density additive particulate.In addition, because the additive particulate is encased by fluoride resin, therefore can also prevent that the additive particulate from coming off in filming.
The 6th scheme, in arbitrary scheme in the above-mentioned the 1st～5, the carborundum, diamond or its hybrid fine particles concentrated area that are biased in top layer one side of top layer inside as the additive particulate are arranged on the bottom surface of pot, then are to become few more the closer to top on the side of pot.Like this, on the bottom of a pan face of the electric cooker by the additive collection of particles being coupled with easily wear load when particularly rice washing waits, can make bottom surface sections have very high mar proof; And additive particulate is also less on the fewer lateral parts of wear load, so additive particulate can not shelter from the typographic(al) mark on the lateral parts, thereby makes these typographic(al) marks have good observability.
Description of drawings
Fig. 1 (a) is the sectional view that the electric cooker of the electric cooker pot in the embodiment of the invention 1 is housed, and Fig. 1 (b) is the local amplification sectional view of this electric cooker pot, and Fig. 1 (c) is the sectional view after the significant points among Fig. 1 (b) is further amplified,
Fig. 2 is the sectional view of the electric cooker pot in the embodiment of the invention 3.
In the above-mentioned accompanying drawing, 12 is ferrite class stainless steel (matrix), and 13 is aluminium (matrix), and 14 is the fluoride resin layer, and 17 is top layer, and 18 is the additive particulate, and 19 is pure layer.
The specific embodiment
Come embodiments of the invention are described with the example as cooking device such as electric cooker with reference to the accompanying drawings.Need to prove that this embodiment does not play the qualification effect to technical scope of the present invention.
(embodiment 1)
Fig. 1 (a) is the sectional view that the electric cooker of the electric cooker pot in the embodiment of the invention 1 is housed, and Fig. 1 (b) is the local amplification sectional view of this electric cooker pot, the sectional view after Fig. 1 (c) further amplifies the significant points among Fig. 1 (b).
As shown in Fig. 1 (a), be provided with mounting or dismounting pot 2 (electric cooker pots) freely in electric cooker pot body 1, electromagnetic induction heating coil 3 is arranged to face the bottom and the bottom, side of pot 2, is used for by electromagnetic induction heating pot 2 being heated.The outside of this electromagnetic induction heating coil 3 is provided with the ferrite 4 that prevents leakage magnetic field.Lid 5 covers the top opening portion of pot 2 in freely the mode of opening and closing, and the inner surface of lid 5 is provided with can be from covering 5 mounting or dismounting inner caps 6 freely.
Cooking bottom temperature detecting sensor 8 is arranged to head on the bottom of pot, is used to detect the temperature of pot 2, and its output signal is fed to and adds in the thermal control substrate 9.Add that thermal control substrate 9 is provided with micro computer and in electromagnetic induction heating coil 3 circuit such as frequency converter of supply high frequency electric current, on one side cool off by cooling fan 7 and to carry out work on one side.Adding thermal control substrate 9 cooks and is incubated operation according to carrying out under the programme-control that micro computer carries out from the input information of operation part 10.11 is the steam cap.
The concrete structure of pot 2 is as shown in Fig. 1 (b), the composite that with thickness is the ferrite class stainless steel 12 of 0.5mm and aluminium 13 be combined intos that thickness is 1.0mm is as matrix, carry out punch process with ferrite class stainless steel 12 1 sides as outer surface again, make a pot shape.
The inner surface of pot 2 is that the surface of aluminium 13 is provided with the fluoride resin layer 14 that is 2 layers of formation.A kind of processing mode of this fluoride resin layer be with as the silicon-carbide particles of additive top layer internal bias on the top layer one side.Below with reference to Fig. 1 (c) this occasion is specifically described.
After matrix struck out pot shape and cleaning, to the inner surface of pot is the processing of sandblasting of the surface of aluminium 13, surface roughness Ra is adjusted into 3～5 μ m, then, be coated with and apply the aqueous subbing that constituent is fluoride resin and bonding composition, pigment, gloss material etc., and make the thickness after the film forming reach about 10 μ m, last under 100 ℃ temperature dry 20 minutes.
After the drying of bottom 15 finishes, using the printing ink different to print waterline mark part 16 by the intaglio plate printing transferring method on the bottom 15 at the pot lateral parts under the situation that substrate temperature fully descends with the color of bottom 15, then, pure layer is set, promptly, above bottom 15 and waterline mark part 16, be coated with the powdery paints of the fluoride resin that applies additives such as not containing pigment and gloss material, and make the thickness after the film forming reach 35 μ m.At this moment, the fluoride resin that uses is the mixed-powder of PTFE:PFA=2:8.
Then, making average grain diameter as additive particulate 18 is that the silicon-carbide particles of 5 μ m are with after the fluoride resin particle that is in molten condition mixes, makes each silicon-carbide particles to be wrapped up (this processing is designated hereinafter simply as " little packetize ") by fluoride resin, be coated with and apply the PFA powdery paints that contains carborundum, and make the thickness after the film forming reach 5 μ m; Add that the front is coated in the hybrid powder coatings 35 μ m of the PTFE:PFA=2:8 on the bottom 15, top layer 17 amounts to 40 μ m; Afterwards, under 380 ℃ temperature, carry out 20 minutes sintering processes again, form the fluoride resin layer.
At this moment, be biased in the carborundum amount decision that is contained near the top layer of top layer 17 the PFA powdery paints of carborundum amount by 5 μ m thickness of last coating.The relation between the performance of carborundum amount in the top layer and fluoride resin layer of being biased in is shown in following table 1.
[table 1]
| Carborundum content g/m 2 | 0 | 0.03 | 0.1 | 0.3 | 1 | 1.7 |
| Anti-nylon bruss abrasivity * 1 | Standard | × | △ | ○ | ○ | ◎ |
| The release property * 2 of rice | Standard | ○ | ○ | ○ | ○ | △ |
| Waterline shows observability * 3 | Standard | ○ | ○ | ○ | △ | × |
In table 1, * 1 weares and teares to the surface of fluoride resin layer after being illustrated in the load that adds 1kg on the nylon bruss that is added with abrasive particles of market sale, and the reciprocal time that will reach again till matrix exposes compares.Wherein, * expression has the durability identical with a reference value, and △ represents to reach 1.5～2.0 times durability of benchmark, and zero expression reaches 2.1～5.0 times durability of benchmark, and ◎ represents to have the durability above 5 times of a reference values.
In addition, * 25 close for boiling (" closing " here is volume unit, be 1 liter 1/10th) meal of rice, after meal is cooked,, measure the weight that from pot 2, does not fall, remains in the rice on the fluoride resin aspect again with pot 2 turned upside down.* expression residual quantity is Duoed more than 50% than benchmark, and △ represents to Duo more than 20% than benchmark that zero expression reaches peer-level with benchmark.
In addition, * 3 is for to carry out visual effect to waterline, but zero expression identification and a reference value are basic identical, and △ represents to be difficult to slightly see clearly compared with benchmark, * represent that then waterline does not see fully.
In the present embodiment, owing to be the PFA powdery paints that has been provided with in the upper strata of pure layer after the carborundum that makes average grain diameter 5 μ m has been realized little packetize, and thickness is 5 μ m after the film forming, and therefore, the particulate of carborundum is one side on the top layer partially in the inside of top layer 17.
The Mohs' hardness of carborundum is very high, be only second to diamond and boron carbide, simultaneously high temperature resistant, also has very high stability for acid and alkalescence, therefore, for improving mar proof in thin rice gruel that is added on the high temperature that is exposed to when cooking, rice and the fluoride resin layer in the pot 2 in the various flavoring, be very suitable material.Particularly, wanting to have given play to anti abrasive effect, near this point in top layer that is arranged on the top layer 17 of fluoride resin layer is very important.
In actual use; the nylon bruss wiping fluoride resin aspect of on market, selling, when pot 2 is cleaned; often can see that the fluoride resin layer weares and teares, the phenomenon of deterioration, the abrasive action that the grinding-material that contains in this and the nylon bruss produces has very big relation.In general, contained grinding-material is the aluminium particulate in the nylon bruss, but what use in the present embodiment is the high carborundum of hardness ratio aluminium particulate, so also can obtain very high mar proof for nylon bruss.
Here, the carborundum amount in the top layer 17 shown in the observation table 1 can be found: the amount of carborundum during less than 0.1g, can't be expected the mar proof that reaches enough probably in per 1 square metre; And per 1 square metre when surpassing 1g, will deterioration to the release property of rice, simultaneously, because the transparent step-down of top layer 17, the observability of waterline is also with variation.When therefore, near the ratio the top layer of carborundum in top layer 17 is per 1 square metre of 0.1～1g for best.
In addition, in the present embodiment, what use in the top layer 17 is the mixed-powder of PTFE:PFA=2:8, and the flowability in the time of can making sintering compared with pure PFA reduces.The purpose of doing like this is as follows, the proportion of contained carborundum is about 3.25 among the PFA on upper strata, proportion (being about 2.2) than fluoride resin is high, can prevent that carborundum from sinking in the top layer 17 after adopting above-mentioned mixed proportion in sintering process, can play the effect that promotes carborundum to be biased in top layer one side of top layer 17.
Specifically, in the present embodiment, be the 7g/10 branch under the load of melt fluidity (MFR) at 5kg of the hybrid powder coatings of PTFE:PFA=2:8 in the time of 372 ℃, flowability is lower; In contrast to this, the melt fluidity that is positioned at the PFA powdery paints on its upper strata is the 14g/10 branch, and is mobile than higher, therefore helps to make carborundum to disperse equably near the top layer of top layer 17.
In addition, carborundum is biased near the top layer of top layer 17, and as shown in Fig. 1 (c), carborundum is to concentrate on from the surface of top layer 17 the down structure the thickness about 10 μ m, the about 30 μ ms thick pure layer 19 of its below for containing carborundum hardly.
Containing near the top layer of carborundum, though because carborundum is compared with fluoride resin and is hydrophily, exist the possibility of adverse effects such as allowing moisture immerses, generation corrosion resistance deterioration, but, because its lower floor is the pure layer 19 with certain thickness silicon carbide-containing hardly, therefore corrosion such as moisture and flavoring promote that material is difficult for invading matrix, thereby can suppress the phenomenon generation that matrix is corroded.
The thickness of pure layer and the experimental result of the relation between the corrosion resistance have been shown in the table 2.This be per 1 square metre carborundum, thickness that contains 0.5g be about the thick layer of 10 μ m below form the pure layer of different-thickness, make fluoride resin layer pot; Then, fill 2% salt solution and 1% citric acid mixed aqueous solution, again 60 ℃ of corrosion resistance experimental results of obtaining after 30 days of insulation down.
[table 2]
| No.1 | No.2 | No.3 | No.4 | No.5 | |
| Pure layer thickness (μ m) | 10 | 15 | 20 | 30 | 40 |
| The corrosion resistance experimental result | × | × | ○ | ○ | ○ |
" zero " in the table 2, " * " expression result of determination, zero expression is not unusual, * then expression has foaming material to take place.
As can be seen from Table 2, do not contain fully or when the thickness of the pure layer 19 of silicon carbide-containing was thin than 20 μ m hardly, the intrusion of moisture etc. just change was many, corrosion resistance will deterioration; And, then has good corrosion resistance at 20 μ m or when above.So pure layer 19 is 20 μ m or is the best more than it.
Below table 3 in when the average grain diameter that makes the carborundum in the top layer side that is biased in top layer 17 inside being shown having changed, the corrosion resistance of fluoride resin layer and the relation between the mar proof.At this moment, the addition of carborundum in the top layer top layer is set at every square metre of 0.3g.
[table 3]
| No.1 | No.2 | No.3 | No.4 | No.5 | |
| The average grain diameter of carborundum (μ m) | 0.5 | 1.2 | 10 | 20 | 40 |
| The gross thickness of carborundum particle diameter/top layer (%) * 1 | 1.25 | 3 | 25 | 50 | 100 |
| Corrosion resistance experimental result * 2 | ○ | ○ | ○ | ○ | × |
| The abrasiveness * 3 of anti-nylon bruss | × | ○ | ○ | ○ | ○ |
In the table 3, the top layer gross thickness in * 1 row is 40 μ m.In addition, identical in the judgment criteria of * 2 and the table 2, identical in the judgment criteria of * 3 and the table 1.
As can be seen from Table 3, if the average grain diameter of carborundum can guarantee good corrosion resistance and mar proof in 3～50% scope of top layer 17 thickness.In actual applications, being located in this scope with the average grain diameter of carborundum is the best.
In addition, though in the present embodiment carborundum is carried out re-using after little packetize on powdery paints,, apply after carborundum is spread in liquid coating.Under this occasion, can be coated with the pure layer that applies the fluoride resin layer that do not contain the additive particulate earlier, carry out sintering, and then be coated with by spraying method and to apply the liquid coating that added carborundum, carry out sintering again.
(embodiment 2)
Occasion when diamond is carried out bias treatment as the additive particulate among Fig. 1 (c) 18 describes below.
Here, with the same among the top embodiment 1, matrix adopting in the electric cooker pot 2 in the present embodiment 2 also be to be the ferrite class stainless steel 12 of 0.5mm and the composite of aluminium 13 be combined intos that thickness is 1.0mm by thickness, carry out punch process with ferrite class stainless steel 12 1 sides as outer surface, make a pot shape.The surface of the aluminium lamination 13 of the inner surface of formation pot 2 is provided with the fluoride resin layer 14 that is 2 layers of structure.
After matrix formed the pot shape by punch process, clean earlier, the inner surface (being the surface of aluminium lamination 13) at pot sandblasts again, and surface roughness Ra is adjusted into 3～5 μ m; , be coated with and apply the aqueous subbing that constituent is fluoride resin and bonding composition, pigment, gloss material, and make the thickness after the film forming reach about 10 μ m thereafter, at last 100 ℃ dry 20 minutes down.
After the drying for the treatment of bottom 15 is finished and substrate temperature fully descends, using the printing ink different to print waterline mark part 16 by the intaglio plate printing transferring method on the bottom 15 of pot lateral parts with primary colour; Afterwards, pure layer is set again, that is, the fluoride resin powdery paints that does not contain additives such as pigment and gloss material is coated on bottom 15 and the waterline mark part 16, and makes the thickness after the film forming reach 35 μ m.At this moment, the fluoride resin that uses is the mixed-powder of PTFE:PFA=3:7.
Next, making average grain diameter as additive particulate 18 is that the diamond of 4 μ m carries out little packetize, is coated with then to apply and contains adamantine PFA powdery paints, and make the thickness after the film forming reach 5 μ m.Add the hybrid powder coatings 35 μ m that are coated in the PTFE:PFA=3:7 on the aforementioned bottom, the top layer gross thickness can reach 40 μ m.Afterwards, under 380 ℃ temperature, carry out 20 minutes sintering processes, form the fluoride resin tunic.
At this moment, the difference of the diamond amount that is contained in the PFA powdery paints because of 5 μ m thickness of last coating, the relation that is biased between the performance of the diamond amount of near surface and fluoride resin layer is as shown in table 4.
[table 4]
| Diamond amount g/m 2 | 0 | 0.003 | 0.01 | 0.3 | 1 | 1.7 |
| The abrasiveness * 1 of anti-nylon bruss | Standard | × | ○ | ◎ | ◎ | ◎ |
| The release property * 2 of rice | Standard | ○ | ○ | ○ | ○ | △ |
| Waterline shows observability * 3 | Standard | ○ | ○ | ○ | △ | × |
In table 4, identical in the judgment criteria of * 1, * 2 and * 3 and the table 1.
In the present embodiment, owing to be to be that the PFA powdery paints that the diamond of 5 μ m carries out after little packetize is arranged on the top of top layer 17 with average grain diameter, and to make the thickness after the film forming be 5 μ m, therefore, diamond then in top layer 17 internal biases near the top layer.
Because diamond is the highest material of Mohs' hardness, also high temperature resistant simultaneously, also has very high stability for acid and alkalescence, therefore, for improving mar proof in thin rice gruel that is added on the high temperature that is exposed to when cooking, rice and the fluoride resin layer in the pot 2 in the various flavoring, be very suitable material.Particularly, want to have given play to wear-resistant effect, it is arranged on this point is very important near the top layer of top layer 17 of fluoride resin layer.
What use in top layer 17 in the present embodiment in addition, is the mixed-powder of PTFE:PFA=3:7.The purpose of doing like this is, because contained adamantine proportion is about 3.5 among the PFA on upper strata, proportion (being about 2.2) height than fluoride resin, and it is important bigger than the ratio of the carborundum that uses in the foregoing description 1, therefore, the blending ratio compared with embodiment 1 can increase PTFE further reduces mobile, prevent that diamond particle from sinking to top layer 17 depths, promotes near its top layer that is biased in top layer 17.
In actual use; the nylon bruss wiping fluoride resin aspect of on market, selling, when pot 2 is cleaned; often can see that the fluoride resin layer grinds off, the phenomenon of deterioration, the abrasive action that the grinding-material that contains in this and the nylon bruss produces has very big relation.In general, contained grinding-material is the aluminium particulate in the nylon bruss, but what use in the present embodiment is the high diamond of hardness ratio aluminium particulate, so also can obtain very high mar proof for nylon bruss.
Here, the diamond in the top layer 17 shown in the observation table 4 can be found: adamantine addition during less than 0.01g, can't reach enough mar proofs probably in per 1 square metre; And per 1 square metre when surpassing 1g, the release property of rice will deterioration, and simultaneously, because the transparent step-down of top layer 17, the observability of waterline is also with variation.Therefore, near the ratio the top layer of diamond in top layer 17 is the best with per 1 square metre of 0.01～1g.
In addition, consider corrosion proof words, below the top layer of containing adamantine top layer 17, preferably with in the above embodiments 1 the same 20 μ m or thicker not containing fully or diamantiferous hardly pure layer 19 be set.In addition, adamantine average grain diameter is best in 3～50% scope of top layer 17 thickness.
In addition, though the additive that uses in the above embodiments 1 and present embodiment 2 is respectively carborundum and diamond, but also can use both mixtures, also be without any problem with re-using after these particulates and aluminium, ceramic material (as silicon etc.) and the mixing such as carbon, gloss material or mica in addition.As previously described, importantly after experimentizing demonstration, the observability to the release property of rice and the typographic(al) mark on the bottom determines the addition of additive again.
In addition, adopt words of the present invention, can be easy to top layer one side that makes the additive particulate be biased in top layer inside, can reach as described above and improve effects such as wear-resistant.In addition, using under the occasion of diamond as the additive particulate, will become the core of boiling at the particulate of top layer side, when cooking, will produce many tiny bubbles in top layer internal bias, produce good convection current, thereby can realize the excellent performance of cooking.Under regard to this point and be elaborated.
The conductivity of fluoride resin heat is low, and owing to be lyophobic dust, so repellency is very high.Therefore, add entry laggard when heating row in being provided with the pot of fluoride resin layer, the bubble that the boiling back produces is difficult for from the surface from taking off and constantly increasing, and this can hinder to conduct heat leads, encumbers convection current.Like this, bring adverse influence can for the sense of taste of the meal of making.
In order to improve this situation, can consider in the fluoride resin layer, to be added into and itself belong to hydrophilic material, reduce repellency.But, under the occasion of adding hydrophilic material, exist the generation release property and can descend the degradation adverse effect.
On the other hand, diamond is a lyophobic dust, with the compatibility of fluoride resin might as well, the possibility that produces adverse effects such as release property worsens, comes off from the surface, suction is also less.
In addition, the pyroconductivity of fluoride resin is extremely low, is 0.26W/mk, in contrast to this, the adamantine pyroconductivity that is added in the present embodiment is then high, is about 2000W/mk, be about 9 times of aluminium, about 5 times of copper are much higher than pyroconductivity and are considered to high metal.
Therefore, because diamond has extremely high pyroconductivity, therefore, particularly under with the occasion of diamond particle as the additive particulate, diamond particle will become the boiling core, constitute the heat release point, be easy to generate the tiny bubble of generation during heating.As a result, will produce good convection current in the water in the pot, heat can be delivered on the interior rice of pot equably, therefore the irregular phenomenon of the degree of boiling can not occur, thereby can guarantee the good performance of cooking.
(embodiment 3)
As shown in Figure 2, be provided with a lot of additive particulates near the bottom surface of pot 2 the position 20, here be carborundum, diamond or their mixed-powder as the additive particulate is biased in top layer one side in the inner concentrated area of top layer position, the top, side of pot 2 then is coated with apposition additive particulate seldom, forms additive particulate position 21 seldom.Other constitute with the foregoing description 1 or 2 in identical.
The same in pot used herein 2 and the foregoing description 1, be that the ferrite class stainless steel of 0.5mm and the composite of the aluminium be combined into that thickness is 1.0mm are matrix with thickness, and be that outer surface carries out punch process with ferrite class stainless steel one side, make a pot shape.
Aluminium face as the inner surface of pot 2 is provided with the fluoride resin layer that is 2 layers of structure.Processing to this fluoride resin layer describes below.
After matrix is struck out pot shape, clean earlier, sandblast on the aluminium surface to the inner surface of pot again, surface roughness Ra is adjusted to 3～5 μ m; Afterwards, be coated with and apply the aqueous subbing that constituent is fluoride resin and bonding composition, pigment, gloss material, and make the thickness after the film forming reach about 10 μ m, under 100 ℃ temperature dry 20 minutes again.
After the drying of bottom finishes, treat that substrate temperature fully descends after, using the printing ink different to print the waterline mark part by the intaglio plate printing transferring method on the bottom of side surface part with primary colour; Afterwards, pure layer is set, promptly on bottom and waterline mark part, is coated with the fluoride resin powdery paints that applies additives such as not containing pigment and gloss material, and makes the thickness after the film forming reach 35 μ m.At this moment, the fluoride resin that uses is the PFA powder.
Then, be coated with and apply the PFA powdery paints, contain in this powdery paints 1% percentage by weight, average grain diameter is that the diamond of 10 μ m is as the additive particulate.As shown in Figure 2, coating is concentrated in the bottom surface and the bottom, side of pot 2, make the thickness after the film forming reach about 5 μ m, then almost do not adhere on the side surface part and coat.Afterwards, under 380 ℃ temperature, carry out 20 minutes sintering processes, form the fluoride resin tunic.
Handle by carrying out above-mentioned coating, the additive particulate is that diamond concentrates on the bottom surface of pot, also will become few more the closer to top additive particulate on the side.Like this, the bottom surface portions that the wear load that produces in the time of can making rice washing and cleaning is easy to apply to has very high mar proof, simultaneously on the less side surface part of wear load the additive particulate is arranged seldom then, so the additive particulate can not shelter from the typographic(al) mark on the lateral parts, thereby can guarantee good observability.
In addition, though the additive particulate of Shi Yonging is a diamond in the above-described embodiment, also be without any problem with re-using after aluminium, ceramic material (as silicon etc.) and the mixing such as carbon, gloss material or mica.As mentioned above, importantly after experimentizing demonstration, the observability to the release property of rice and the typographic(al) mark on the bottom determines the addition of additive again.
In addition, adopt after the present invention, can be easy to make the additive particulate to be biased in the top layer side of top layer inside, as mentioned above, can reach the effect that improves mar proof etc.In addition, near the diamond particle of top layer side that is biased in top layer inside will become the core of boiling, will produce many tiny bubbles when cooking, and produces good convection current, thereby can realize the good performance of cooking.
In sum, electric cooker among the present invention is by making the top layer side that is biased in the top layer inside of the fluoride resin layer on the matrix that is formed on pot as the carborundum of additive particulate and diamond, needn't thicken thickness significantly and also can reach very high mar proof and excellent durability, and can guarantee the observability of the release property and the waterline of gratin fully, therefore can also be used in the heating surface that on the surface of matrix, is formed with the electric-heating cooking utensil of fluoride resin layer, and micro-wave oven etc. in the internal face of heating clamber on.
Claims (6)
1. electric cooker, it is characterized in that being provided with a pot, the inner surface of the matrix of described pot is provided with the fluoride resin layer, wherein, as at least a top layer internal bias at described fluoride resin layer in the carborundum of additive and the diamond particle on the top layer one side, simultaneously, lower floor's one side in the described top layer is provided with the pure layer that does not contain described additive particulate.
2. electric cooker as claimed in claim 1 is characterized in that: the amount of the carborundum that adds as the additive particulate is per 1 square metre of 0.1～1g.
3. electric cooker as claimed in claim 1 is characterized in that: the adamantine amount that adds as the additive particulate is per 1 square metre of 0.01～1g.
4. as each described electric cooker of claim 1～3, it is characterized in that: the average grain diameter of additive particulate be top layer thickness 3～50%.
5. as each described electric cooker of claim 1～3, it is characterized in that: the stacking top that is added in described pure layer that the powdery paints coating that the additive particulate is formed by fluoride resin parcel back forms.
6. as each described electric cooker of claim 1～3, it is characterized in that: being arranged on to the additive collection of particles on the bottom surface of pot, then is to become few more the closer to top on the side of pot.
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| JP2004161019 | 2004-05-31 | ||
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| KR101244761B1 (en) | 2010-12-28 | 2013-03-18 | 유한회사 대상공업 | durability reinforcement inner pot for cooker and coating method thereof |
| KR101557713B1 (en) * | 2015-03-05 | 2015-10-06 | 유한회사 한국 타코닉 | Cooking apparatus with improved non-stick property and method of manufacturing the same |
| CN108720547B (en) * | 2017-04-25 | 2024-02-13 | 佛山市顺德区美的电热电器制造有限公司 | Non-stick coating, preparation method thereof, cooker and cooking equipment |
| CN107616691A (en) * | 2017-05-16 | 2018-01-23 | 合肥人和节能环保设备制造有限公司 | A kind of combustion type intelligence rice is cooked a meal meal cabinet |
| CN110338667B (en) * | 2018-04-02 | 2022-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Inner pot and cooking utensil |
| CN112839551A (en) * | 2018-11-06 | 2021-05-25 | 京瓷株式会社 | Cooking utensil |
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| JP2605964B2 (en) * | 1991-08-21 | 1997-04-30 | 松下電器産業株式会社 | Fluororesin laminate, method for producing the same, and container having fluororesin laminate |
| JP3487907B2 (en) * | 1994-06-30 | 2004-01-19 | 松下電器産業株式会社 | Cooker pot |
| JP2589459B2 (en) * | 1994-12-27 | 1997-03-12 | 東芝タンガロイ株式会社 | kitchenware |
| JP2004033393A (en) * | 2002-07-02 | 2004-02-05 | Matsushita Electric Ind Co Ltd | Rice cooker |
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