WO2004019742A1

WO2004019742A1 - The method for manufacturing of frying pan using steel sheet coated by aluminum

Info

Publication number: WO2004019742A1
Application number: PCT/KR2002/002059
Authority: WO
Inventors: Bong-Ki Baek
Original assignee: Bong-Ki Baek
Priority date: 2002-09-02
Filing date: 2002-11-05
Publication date: 2004-03-11
Also published as: JP2005537088A; AU2002349483A1; KR20020072524A; KR100394832B1

Abstract

This invention generally relates to the manufacturing method for frying pan and its' apparatus with use of aluminum coated steel plate. More particularly, the invention relates to foregoing method and apparatus optimizing thermal efficiency, reducing production and marketing cost and preventing warp of pan bottom from heating by high-frequency radio fusion of outer formed frying pan being made of aluminum coated steel plate with inserted aluminum reinforcing plate. In accordance with the invention, a differentiated manufacturing method for frying pan and its' apparatus using aluminum coated steel plate is provided including processes of press forming (A1), overlapping (A2) and high-frequency radio fusing (A3).

Description

DESCRIPTION

(THE METHOD FOR MANUFACTURING OF FRYING PAN USING STEEL SHEET

COATED BY ALUMINUM)

1. TECHNICAL FEILD

This invention is about a method for manufacturing frying pan using steel sheet coated by aluminum. In detail, it is a frying pan manufacturing method not only to prevent the bottom of frying pan from bending by thermal deformation, by inserting an aluminum reinforcement plate into the frying pan made of steel sheet coated by aluminums and by thermal fusing fixation with high-frequency wave, but also, as a result, to maximize heating effect and to reduce manufacturing and sale cost.

2. BACKGROUND ART

In general, a frying pan, which consists of food insertion part where food is inserted and cooked, a handle part and the heating area on the bottom, is used to cook various food kinds and it is manufactured as a final product by press molding a stainless or aluminum plate in frying pan shape followed by coating and drying it to prevent food from sticking, followed by forming oxide film on its surface, and by assembling frying pan handle to the pan.

However, frying pans made of stainless or aluminum plates as mentioned above cost much to manufacture for its high material cost and cause thermal deformation due to concentrated heat on certain portion of the bottom heating area. The thermal deformation occurs differently for regular gas range and induction gas range, and it causes problem of deteriorating the food taste by uneven food processing, due to thermal deformation to the upper direction for regular gas range frying pans or to the down direction for induction gas range frying pans.

Although there are frying pans which feature an aluminum reinforcement plate insert between the food insertion part made of steel and the heating area on the bottom made of stainless steel, they still did not solve the problems of thermal deformation effect on the bottom heat area and increased manufacturing cost.

3. DISCLOSURE OF INVENTION

The detail descriptions with attached diagrams on this invention are as follows: Fig. 1 is a general diagram showing the overall flow, Fig. 2 is a status diagram showing the plate status for this invention, Fig. 3 is a status diagram showing the high-frequency wave thermal fusing for this invention, Fig. 4 is a perspective diagram showing the frying pan for this invention, Fig. 5 is a graph representing the corrosion resistance of the aluminum -plated steel plate for this invention. In comparison to the conventional frying pan manufacturing method comprised of the press molding step (SI) that forms food insertion part (10) and the bottom heating area (20) with a plate made of stainless steel plate (1), the coating/drying step (S2) that coats and dries the food insertion part (10) and the bottom heating area (20), and the assembling and packaging step (S3) that mounts a handle (30) on a side of the food insertion part (10) and the bottom heating area (20) and packaging, this invention is distinguished by the press molding step (Al) molding the food inserting part (10) using a plate (1) of aluminum-plated steel as in Fig. 1 ; and the stacking step (A2) that stacks the reinforcement plate (40) made of aluminum and the bottom heating area (20) made of steel sheet coated by aluminums to the molded food insertion part (10) applying powder (2) and adhesive (3); and the high-frequency wave thermal fixation step (A3) that fixes the above stacked parts with high-frequency wave thermal fixation at certain temperature for certain duration of time.

From the above, the plate (1) is formed by plating a steel plate (4) of certain thickness to the outer circumference of the plate with aluminum (5)(5') at 50g/ m², as in Fig. 2.

From the above, the high-temperature wave thermal fusing fixation step (A3) is applied for 15-20 seconds at 550^°Cfor thermal fixation as in Fig. 3.

In general, a frying pan (100) made of aluminum-coated steel plate is formed by inserting a reinforcement plate (40) made of steel between the food insertion part (10) and the bottom heating area (20), because, when heated, the uniformly conducted heat at the bottom heating area (20) is concentrates at certain areas of the reinforcement plate (40) and it causes thermal deformation of the reinforcement plate (40) and further causes the deformation of the food insertion part (10) to upward or downward direction. Also, since the plating ratio of the steel sheet coated by aluminums is not appropriate, problems such as deteriorated thermal continuity and thermal conductivity were resulted.

Therefore, in this invention, experiments were performed to optimally form the plate (1) made of steel sheet coated by aluminums in order to prevent the thermal deformation mentioned above and to maximize the thermal continuity and thermal conductivity. That is, an experiment was conducted to insert a 0.5mm steel plate (4) between aluminum plates (5)(5') of 30g/m² at 260 ^°C which was the optimal temperature as the range of heating temperature for a conventional frying pan (100) is 190 ~ 350 ^°C . However, not only there was thermal deformation to the plate (1), but also the aluminum (5)(5')-plate part was melt by the heat of high frequency wave. With this result, another experiment was conducted by inserting a steel 7 9 plate (4) between aluminum plates (5)(5') increased by 20g/m from 30g/m to 50g/m as in Fig. 2, and the result showed that the thermal deformation did not occur and the thermal conductivity was high, and an optimum plate with high corrosion resistance and heat resistance was formed. Also, the conventional reinforcement plate made of steel that has low thermal conductivity and heat resistance was replaced with that made of pure aluminum which has superior thermal conductivity and heat resistance.

The process to manufacture a frying pan (100) using the molded plate (1) and the reinforcement plate (40) is described as follows: press molding the formed plate (1) made of steel sheet coated by aluminums as in Fig. 1 as a food insertion part (10), and stacking to the bottom of the food insertion part (10) a reinforcement plate (40) made of pure aluminum and a bottom heat area (20) made of steel sheet coated by aluminums, by applying powder (2) and adhesive (3) to the adhering areas and thermally fixing with high-frequency wave at 550 ^°C for 15-20 seconds. After the thermal fixation, any portion other than the bottom heating area (20) is cut away, and the inside and outside of the food insertion part (10) is coated with primer coating by spraying sand, and the final product is manufactured by drying it, assembling the handle (30) and packaging it.

In a frying pan manufactured using the method as above (100), a pure aluminum reinforcement plate (40) is thermally fused between the food insertion part (10) made of plate (1) and the bottom heating area (20) as in Fig. 4, and a handle in certain form is arranged at one side of the food insertion part (10) for use in regular ranges and induction ranges altogether. The process of inserting food into the formed frying pan (100) as above and heating the inserted food is described as follows: the heat applied to the bottom heating area (20) gets transfers to all areas of the steel plate (4) via the aluminum (5') without getting concentrated on a certain area, and the heat transferred to the steel plate (4) is transferred to the aluminum (5) and then to the reinforcement plate (40) made of pure aluminum. The heat transferred to the reinforcement plate (40) gets conducted uniformly on the reinforcement plate (40), unlike with the reinforcement plate made of steel, and gets conducted to the food insertion part (10) with a uniform manner without any thermal deformation, thus heating the food in the food insertion part (10) and improving the taste of cooked food. In the above, when the bottom heat area (20) is applied with continuous heat, due to the superior thermal continuity and thermal conductivity of the aluminum (5)(5')-plated plate (1), the applied heat does not concentrate on a certain area and distributes uniformly preventing thermal deformation from occurring at certain areas. And the food insertion part (10) and the bottom heating area (20) made of steel sheet coated by aluminums possess strong corrosion resistance and superior heat resistance as in Fig. 5 due to the characteristics of the steel sheet coated by aluminums forming fine oxide and hydroxide films in air or water, therefore even long-term usage at high temperature of 260 ^°C does not cause any external damage or discolor, and does not peel off the coated film.

4. BRIEF DESCRIPTION OF DRAWINGS

Fig. 1 is a general view describing the overall flow of this invention

Fig. 2 is a status view showing the plate status of this invention

Fig. 3 is a status view showing the status of high-frequency wave thermal fusing in this invention Fig. 4 is a perspective view showing the frying pan in this invention

Fig. 5 is a graph showing the corrosion resistance characteristic of the aluminum-plated steel plate

< Descriptions of the symbols for the main parts in the drawing> 1 : Plate 2: Powder 3: Adhesive

4: Steel plate 5,5': Aluminum 10: Food insertion part 20: Bottom heating area 30: A handle part 40: Reinforcement plate

100: Frying pan Al : Press molding step A2: Stacking step

A3 : High-frequency wave thermal fusing fixation step S 1 : Press molding step S2: Coating and drying step S3: Assembling and packaging step

5. INDUSTRIAL APPLICABILITY

As mentioned above, this invention is effective in preventing thermal deformation on the bottom heating area (20) of a frying pan, by stacking pure aluminum reinforcement plate (40) to the food insertion part (10) and the bottom heat area (20) and by high-frequency wave thermal fusing fixation, and in enhancing the heat and corrosion resistance of a frying pan (100), as a result in maximizing, the heating effect and also in manufacturing high quality frying pan (100) at minimized manufacturing cost using low cost steel sheet coated by aluminum.

Claims

1. A frying pan manufacturing method, using steel sheet coated by aluminum with the characteristics and the processes including: the press molding step (Al) forming the food insertion part (10) using steel sheet coated by aluminums (1); the stacking step (A2) stacking the aluminum reinforcement plate (40) and the bottom heating area (20) made of steel sheet coated by aluminums using powder (2) and adhesive (3) to the bottom of the food insertion part (10); and the high-frequency wave thermal fusing fixation step (A3) thermally fusing the above stacked parts by applying high-frequency wave for certain duration of time at certain temperature, in connection to the conventional frying pan manufacturing method comprised of the press molding step (SI) for the food insertion part (10) and the bottom heating area (20) using stainless steel plate (1); the coating and drying step (S2) coating and drying the molded food insertion part (10) and bottom heating area (20); and the assembling and packaging step (S3) assembling a handle on one side of the food insertion part (10) and the bottom heating area (20), and packaging the product.

2. In conjunction with Claim 1, a frying pan manufacturing method using steel sheet coated by aluminum with the specification of forming the plate (1) by plating aluminum (5)(5') of 50g/m² to the outer circumference of a steel plate (4) with certain thickness.

3. In conjunction with Claim 1 , a frying pan manufacturing method using steel sheet coated by aluminum with the specification of applying high-frequency wave thermal fusing fixation step (A3) for thermal fusing for 15-20 seconds at the temperature of 550 ^°C .