JPH03193223A - Manufacture of aluminum or aluminum alloy can - Google Patents

Abstract

PURPOSE:To keep the generation of defective aluminum or aluminum alloy cans at a low rate by coating the surface of a plate stock of Al or Al alloy with wax under the control of temperature conditions and then deep-drawing the plate stock. CONSTITUTION:The surface of a plate stock of Al or Al alloy is coated with wax under the control of temperature conditions. Then, deep drawing is performed. The relation between the temperature of wax and the quantity of adhesion of the wax to the Al surface is researched. Then, the relation between the quantity of adhesion of wax and the rate of generation of defective Al cans is researched. A result that when the quantity of wax is kept in a definite range the rate of generation of defectives is low was obtained from this research. In this way, the quantity of adhesion of wax to the Al plate stock can be kept at a appropriate value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing aluminum or aluminum alloy cans.

[Prior Art] Conventionally, a technology has been used to manufacture aluminum cans by applying wax to a blank plate made of aluminum or aluminum alloy (hereinafter collectively referred to as "aluminum") and deep drawing. ing. According to this conventional technique,
Application of wax has the advantage of reducing the risk of wrinkles and cracks forming in the aluminum can.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, it is not possible to keep the amount of wax deposited on the aluminum base plate constant per unit area, so the amount of wax deposited may be excessive or excessive compared to the appropriate value. Sometimes it was too low. In the deep drawing process, if too much wax is applied, a mixture of wax and alumina powder will adhere to the surface of the aluminum can, increasing the risk of staining the surface of the aluminum can. In some cases, there is an increased risk that aluminum cans will wrinkle or crack. As described above, in the conventional technology, there is a problem that the amount of wax attached is too large and the amount of wax is too small, which may increase the incidence of defective products in aluminum cans.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for manufacturing aluminum cans that can maintain the amount of wax adhering to an aluminum base plate at an appropriate value.

[Means for Solving the Problems] In order to maintain the amount of wax adhering to an aluminum base plate within an appropriate range, the inventor of the present invention has conducted intensive research and found that the amount of wax adhering depends on the temperature conditions of the wax. The present invention was made based on the discovery of the fact that

That is, the present invention applies wax to the surface of an aluminum base plate under controlled temperature conditions, and then performs a deep drawing process.
A method for manufacturing aluminum cans is provided.

As the wax that can be used in the present invention, for example, Lubricant 39J (trade name, manufactured by Dexter Midland Co., Ltd.) can be mentioned.

[Effects of the Invention] The present invention is configured as an aluminum can manufacturing method in which wax is applied to the surface of an aluminum base plate under controlled temperature conditions, and then deep drawing processing is performed. The amount of wax deposited can be maintained at an appropriate value, which has the effect of keeping the incidence of defective products in manufactured aluminum cans low.

[Example (Example)] The wax used was [lubricant 39J (trade name,
(manufactured by Dexter Midland Co., Ltd.), and the relationship between the wax temperature T ('C) and the amount of wax deposited on the aluminum surface per unit area was investigated to obtain the results.

Next, we investigated the relationship between the amount of wax adhesion and the incidence of defective products in aluminum cans, and found that when the amount of wax adhesion was within a certain range, the incidence of defective products decreased.

Therefore, by calculating the wax temperature T ("C) that can obtain the appropriate amount of wax adhesion, and controlling the wax temperature within this temperature range and applying it to the aluminum base plate, it is possible to The amount of wax attached was able to be within the appropriate range.

Next, when aluminum cans were manufactured by deep drawing the aluminum blanks, it was possible to keep the incidence of defective products low.

(Comparative Example) When wax was applied to an aluminum blank plate without controlling the temperature conditions, the incidence of defective products was higher than in the above example.

Claims (1)

[Claims] On the surface of aluminum or aluminum alloy base plate,
A method for producing an aluminum or aluminum alloy can, which comprises applying wax under controlled temperature conditions and then deep drawing.