KR100244392B1 - Kitchen porcelain products and the manufacture method thereof - Google Patents

Abstract

The present invention is to dry the molded body in the shape required by using only clay without using base metal or glaze, and then primary firing in a kiln at 750 ° C and PPS on the outer surface of the firing body secondary fired at 1350 ° C. A slurry of polyprophenylene sulfide resin is sprayed to form a thickness of 3 mm, dried and cooled in a mobile furnace (530 ° C.) for 30 minutes, and then sprayed with a primer on the inner surface of the plastic body. Drying and cooling in a furnace (250 ° C.) for 25 minutes, followed by spraying with a slurry of poly tetra fluoro dthlene resin slurry was formed to a thickness of 0.3 mm, followed by drying for 30 minutes in a mobile furnace (460 ° C.). It relates to a kitchen ware product obtained by cooling at room temperature.

Description

Kitchenware products and manufacturing method

This invention relates to kitchen ware, in particular culinary ware and a method of manufacturing the same.

More specifically, the molded product is molded by molding into the required shape using clay as the selected subsidiary material, and naturally dried for 24 hours, and then first baked in a kiln at 750 ° C (the first drying time is 48 hours). Plastic fixation may be omitted), and PPS resin slurry formulations are sprayed on the outer surface of the fired plastic product obtained by secondary firing in a kiln at 1350 ° C. (530 ° C.). After drying for 30 minutes and cooling in the interior of the fired product, by spraying a primer (primer) to dry in a mobile furnace (250 ℃) for 25 minutes and then cooled to the inside of the PTEF resin slurry formulation (polytetrafluoroethylene It is a kitchen pottery product obtained by spraying a resin slurry formulation) and drying it in a mobile furnace (460 ℃) for 30 minutes and finally leaving it at room temperature for cooling. It relates to a method of manufacturing the same.

In general, household ceramics, especially tableware, are classified into dinnerware, hotel china, kitchenware and ovenware. (粗 陶器), precision machine (精 陶器), peninsula (半 陶器), crystallizer, soft magnetic, hard magnetic materials, etc. There are many kinds, but even if it is transparent, glaze is prevented this.

Tableware should look good in appearance and should not be broken when used hard or washed. The shape should be designed practically.

Furthermore, glazes or surface paintings should not dissolve in water and acid and adversely affect the human body.

Pottery containers that use food cannot attach surface paintings and transfer paper containing toxic components to the inner surface of the container or container that is the food contacting area. There should be no such thing as rushing.

In addition, cracks do not occur in the quench test, and lead or cadmium should be less than 7ppn.

In particular, kitchen ware requires acid resistance, abrasion resistance and mechanical strength, and furthermore, in culinary ware, it must be able to withstand temperature fluctuations up to about 170 ° C.

Therefore, the size and organization of subsidies are also important.

In particular, when the container bottom is placed on a hot plate, the narrower the contact portion with the bottom, the more difficult cracking occurs.

And the thickness of the bottom and the wall should be the same as possible.

Partially different thicknesses result in different heat transfer, causing cracks when heated.

Therefore, the choice of body is important.

In case of cordierite, it is calcined at 1350 ℃ using 46% talc, 22% plastic clay, 16% alumina, 12.8% feldspar and 3.2% zinc oxide.

In addition, it was prepared with a mixture of strong plasticity clay stone 40-40%, refractory clay 70-60%.

On the other hand, the surface treatment by materials excellent in heat resistance and corrosion resistance at high temperatures, in particular the application of ceramic coating (ceramic coating) is of great technical importance.

Porcelain enamel products are obtained by applying an inorganic enamel frit to the metal surface and baking them at high temperature (iron, copper: 700-900 ° C, aluminum: 500-550 ° C). It is to be provided with the beauty of glass, corrosion resistance, durability, and non-adsorption.

Base metals include iron, iron alloys, copper, aluminum, etc., and steel sheets are most frequently used.

In addition, aluminum enamel was coated with a fluorocarbon resin (teflon) inside the product has been developed with the ease of cleaning and preventing the adhesion of food.

In the kitchen ware, especially the cooking vessel, which is used in the related art, the manufacturing process is performed by forming the selected clay into various forms, firstly baking it in a kiln at about 800 ° C, and then processing several times such as painting, oil, and so on. Finally, it baked in the kiln of 1350 degreeC, and obtained the required product.

In other words, clay → molding → primary firing (800 ° C.) → primary lacquer, sea oil (internal and external surface treatment) → final firing (1350 ° C.) → product were obtained.

When using a cooking container (for example, a frying pan) obtained through such a process, when the container is opened, food is cooked and degraded on the inner surface, and the attached part is burned, and thus, the intended purpose cannot be achieved. Some components of the treated glaze were eluted, which had a detrimental effect on food cooking.

In addition, due to the characteristics of the glaze in the firing process, the conventional firing process has a large number of processes, which is a factor that increases the manufacturing cost.

Furthermore, there were cases where the product was cracked or destroyed by high temperature heating.

In order to overcome various drawbacks as described above, the present invention has been studied and developed.

This invention will be described below for each treatment step.

[Step 1 (Natural Drying Process)]

Preferred clays are selected in this invention and molded by molding into the shape required.

The resulting molded article is naturally dried for 24 hours.

Second Process (Firing Process)

The molded article naturally dried in the first step is charged into a kiln at 750 ° C. without being treated with glaze and subjected to primary firing.

In addition, the primary firing may be omitted when the drying time is extended to 48 hours.

The molded body after the primary firing is charged into a kiln at 1350 ° C to perform secondary firing.

[3rd process (PPS resin slurry formulation spraying process on the outer surface of the molded product)]

The PPS resin slurry formulations are sprayed with a spray gun (air pressure 15 PSi) on the entire outer surface of the calcined molded body.

At this time, the spray coating thickness is formed to about 3mm.

[4th process (injection treatment process of primer and PTFE resin slurry preparation on the inner surface of molded product)]

In the third step, a primer is sprayed on the entire inner surface of the molded body that has been sprayed on the outer surface with a spray gun.

It is then charged to a mobile furnace (250 ° C.), dried for 25 minutes and cooled.

The PTFE resin slurry formulations are then sprayed with a spray gun and charged into a mobile at 460 ° C. and dried for 30 minutes.

[Step 5 (Room Cooling Treatment Step of Molded Product)]

In the 3rd and 4th process, the molded object which sprayed the inside and outside surface was finally left to stand at room temperature, and cooled.

In this way, kitchen ware products, particularly cooking ware products, which are required are obtained.

The technical details of the above process are described below.

The present invention first forms a coating of a certain thickness by spraying a primer and a PTFE resin slurry on the inner surface of a clay molded product (clay plastic product) formed using only clay without using a base metal and glaze, A coating part made of PTFE resin and PPS resin slurry on the inner and outer surfaces of the plastic product by forming a coating having a predetermined thickness by spraying the PPS resin slurry preparation on the outer surface of the clay plastic product. It is an object of the present invention to provide a kitchen ware product, particularly a cooking pottery product, obtained by melting and adsorbing and leaving the mixture at room temperature for cooling.

Secondly, this invention selects a specific clay without applying the glaze to conventionally used glazes and forms a molded product, which is naturally dried for 24 hours, followed by primary firing in a kiln at 750 ° C and then in a kiln at 1350 ° C. After secondary firing, PPS resin slurry formulations are sprayed on the outer surface of the obtained clay plastic forming agent (clay plastic product) first to form a constant thickness, and then in a mobile furnace at 530 ° C. Dry and cool for 30 minutes, complete the coating on the outer surface of the fired product, and then spray the PTFE resin slurry formulations onto the primer coating layer on the inner surface in a mobile furnace (460 ° C). The object is to provide a kitchenware product obtained by drying for 30 minutes and then finally standing at room temperature to cool. .

Furthermore, the present invention further provides a molded article natural drying step of naturally drying a molded article obtained by molding by molding into a shape required by using a specific clay selected thirdly, and a primary firing in the kiln at 750 ° C. (If the natural drying time is 48 hours, the primary firing treatment may be omitted), and then the firing step of the molded product subjected to secondary firing in a kiln at 1350 ° C., and the outer surface of the fired product obtained in the firing step of the molded product. PPS resin slurry formulations are sprayed with a spray gun to dry and cool in a mobile furnace (530 ° C) for 30 minutes, and the external surface spray treatment process Spray the primer on the entire inner surface of the fired product obtained by the external surface spraying process of the fired product with a spray gun to dry and cool for 25 minutes in a mobile furnace (250 ℃). And then spraying the PTFE resin slurry formulations on the primer coating layer with a spray gun and drying them in a mobile furnace (460 ° C.) for 30 minutes, and the inner surface of the plastic product. A kitchenware product characterized in that it is subjected to a cooling treatment step of a fired product that is finally left at room temperature and cooled by firing the fired product obtained by spraying the final product at room temperature. Its purpose is to provide a method of manufacturing.

In order to achieve the above object, the present invention will be described in detail below.

The clay selected by this invention is demonstrated.

The clay used should be selected in consideration of price and quality, and it is always necessary to keep the ingredients in the same range.

The clay required by the present invention preferably has the following components as a result of the analysis; SiO ₂ 76.52%, Al ₂ O ₃ 16.45%, Fe ₂ O ₃ 0.05%, TiO ₂ 0.01% or less, K ₂ O 0.19%, Na ₂ O 1.00%, Si ₂ O 4.18%

Primers used in this invention are obtained by ball milling for 16 hours with a water based slurry (used with fillers and pigments), 100 parts of cobalt-oxide and 300 parts of propylene glycol.

The primer is uniformly coated on the inner surface of the required plastic article by conventional means so that the PRFE resin slurry preparation to be coated again can be effectively bonded.

The inner surface of the fired product is absorbed deeply and treated to form an extremely thin film on the surface.

With such a coating shape, the PTFE resin suspension to be treated next is more strongly bonded.

If the drying temperature is lower than 250 ℃ during primer treatment, the film is not formed on the inner surface of the plastic product. If the drying temperature is higher than 250 ℃, the primer burns out. Be effective.

As a means of coating, the inner surface of the plastic product is sprayed using a conventional spray gun.

The thickness formed by spraying is preferably treated to be about 0.05 mm.

Next, a polytetrafluoroethylene resin slurry preparation was prepared by using 100 parts of water-based slurry (with filler and pigment), 33 parts of TiO ₂ , 20 parts of PTFE resin, 185 parts of water, 100 parts of propylene glycol, and a humectant. (Wetting agent) It is prepared by ball milling for 24 hours with 4 parts.

If the coating thickness formed on the inner surface of the plastic product obtained in the present invention is thinner than 0.3 mm, the coating may be easily peeled off by metal products such as chopsticks used in the kitchen, and when the coating thickness is too thick (0.3 mm or more), The bonds on the surface of the fired parts become weak, resulting in cracks in the coating during the drying process, which results in a longer drying time.

The thickness is preferably 0.3mm in view of the strongest bonding conditions and economic aspects.

PTFE resin slurry preparation spraying is preferably carried out by spraying the inner surface of the fired product with the primer, coating, drying and completely cooling at room temperature.

In some cases, the fan may be forced to cool.

Spray treatment time may vary depending on season and site temperature.

Further, the PPS resin slurry formulation is described below.

It is obtained by ball milling with a slurry based on water (simultaneous use of filler and pigment), TiO ₂ , PPS resin, and propylene glycol wetting agents.

In this PPS resin slurry preparation, the outer surface of the fired product using clay is first coated.

This coating thickness prevents partial breakage due to contact with other metal kitchen containers when washing the product, and the coating thickness that is treated in consideration of stability and thermal conductivity as a part of direct heat contact is preferably 3 mm.

By coating with this PPS resin suspension, even if long-term high heat is applied to the exterior of the molded product, cracking does not occur, and it satisfies the requirement as a heat resistant resin having excellent thermal stability that is not broken.

The heat treatment in the mobile furnace used in this invention is explained below.

Temperature and time are essential for the easiest and fastest dissolution and adsorption of the resin slurry formulation used.

There is a limit to increase the temperature, so increasing the temperature can reduce the heating time, but there is a problem that requires a lot more fuel costs to increase the temperature.

In addition, lowering the temperature increases the heating time and lowers the production efficiency.

The increase in temperature is not technically a problem, but if the temperature is significantly lowered, the coating may not be good.

Therefore, the experiment result shows that the temperature of 460 ° C and the time of 30 minutes are the optimum conditions as the most preferable temperature and time.

No coating is formed unless it is dried in this mobile furnace.

When heat at a temperature of 460 ° C. is applied to the fired product, the resin slurry formulation constituting the coating is strongly bound to the inner and outer surfaces of the fired product.

Such resin slurry preparation was found to be harmless to humans.

The cooling treatment at room temperature for the fired product can be obtained by leaving it at room temperature.

In some cases, a forced cooling may be performed using a fan.

In addition, it is preferable from the rapid cooling treatment to gradually cool at room temperature in terms of product quality.

Kitchenware products obtained in this invention can be applied to all products that can be produced in a mold can be applied to a variety of products, such as kettles, pots, pots, tableware, barbecue grill.

An example is given below of this invention.

EXAMPLE (Production of Frying Pan in Kitchen Pottery Product)

The clay selected in this invention was used to form a frying pan prototype of the required shape as a casting mold.

The fly fan formation was dried in the shade for 24 hours.

The naturally dried frying pan former was then subjected to primary firing in a kiln at 750 ° C. (the primary firing could be omitted by extending the natural drying time to 48 hours).

The primary fired frying pan fired body prototype was secondary fired at 1350 ° C.

The PPS resin slurry formulation was first sprayed with a spray gun on the outer surface of the frying pan plastic body after the completion of secondary firing.

After the injection, it was charged into a mobile furnace maintained at 530 ° C. and fired for 30 minutes.

And it was left to cool at room temperature and cooled.

After spraying the PPS resin slurry formulation on the outer surface of the frying pan fired body, the primer was sprayed onto the inner surface of the fired body by charging with a spray gun, charged in a mobile furnace at 250 ° C., fired for 25 minutes, and cooled at room temperature.

Subsequently, the PTFE resin slurry formulation was sprayed onto the inner surface of the frying pan fired product sprayed with the primer, and then charged into a mobile furnace at 460 ° C.

And it baked for 30 minutes.

Finally, it was cooled by standing at room temperature.

The frying pan pottery product thus obtained had no food attached to the inner surface of the frying pan when cooking food.

There was no deformation or cracking even in the heating of the hot phase.

Claims (4)

PPS molded on the shape required by using clay as raw material, and naturally dried for 24 hours, and first baked in a 750 ℃ kiln, and then charged into a 1350 ℃ kiln without lubrication treatment and PPS Slurry formulations of polyphenylene sulfide resin are sprayed with a spray gun, dried in a mobile furnace at 530 ° C. for 30 minutes, cooled, and cooled over the entire inner surface of the fired product. After spraying the primer with a spray gun, it is cooled by drying for 25 minutes in a mobile furnace at 250 ° C., and then spraying the PTFE (polytetrafluoro ethylene) resin slurry formulation again with the spray gun on the inner surface of the resulting fired product. It is charged into a mobile oven at ℃ ℃ dried for 30 minutes, and finally the kitchen ware products characterized in that it is left to cool at room temperature. 2. The outer surface of the fired article is sprayed with a PPS resin slurry formulation with a spray gun to form a thickness of 3 mm, and the inner side of the fired article is sprayed with a PPS resin slurry composition first and dried. After cooling, and then sprayed with a primer to dry and cool, and the PTFE resin slurry composition is sprayed to form a thickness of 0.3mm to dry the kitchen ware products, characterized in that. Natural drying process for molding for 24 hours by using clay raw material and natural drying for 24 hours, and the natural dried molding is first baked in 750 ℃ kiln without glaze treatment, and then second baked in 1350 ℃ kiln. PPS resin slurry composition is sprayed onto the first and second firing processes of the molded body to be treated, and the entire outer surface of the molded body after firing is sprayed with a spray gun, dried in a mobile furnace (530 ° C.) for 30 minutes, and cooled. Inject the primer onto the inner surface of the PPS resin slurry composition and the outer surface of the molded body after the injection treatment on the outer surface, load it into a mobile furnace (250 ℃), dry for 25 minutes, cool and Into the molded body sprayed on the surface, the PTFE resin slurry formulation is sprayed on the inner surface of the molded body to be charged at 460 ° C, and dried for 30 minutes. Method of producing a ceramic product as kitchen spray treatment step, in which the injection process by drying and cooling the inner and outer surface of the molded article, and then characterized in that the finally treated in the cooling process of cooling at room temperature, was allowed to stand at room temperature. The method according to claim 3, wherein the inner surface of the molded body is sprayed with a primer and a PTFE resin slurry composition to form a thickness of at least 0.05 mm, and the outer surface of the molded body is sprayed with a PPS resin slurry composition so as to form a thickness of at least 3 mm. The above method.