Method of producing a metallic can using a saturated branched ch

Details Method of producing a metallic can using a saturated branched ch Method of producing a metallic can using a saturated branched ch

1991-08-05

1993-03-09

Larson, Lowell A.

Metal deforming

With 'coating' of work

72 42, B21B 4500

Patent

active

051917793

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates to a method of producing a metallic can by drawing a metallic material having an organic resin coating, and more particularly, the invention relates to a method for improving the printability while omitting degreasing and washing after drawing.
2. Technical Background
In the past, the production of side seamless cans was widely conducted by subjecting a metallic material such as an aluminum plate, a tin plate or a tin-free steel plate to at least one-step drawing between a drawing die and a punch to form a can comprising a side seamless barrel portion and a bottom portion integrally connected to the barrel without seam.
Coating treatment of a draw-formed can is a complicated operation, and dissipation of the solvent poses a problem of environmental pollution at the time of spray coating. Therefore, there is widely adopted a method in which an organic resin coating is applied on the surface of the metallic material by lamination of a resin film or coating of an organic resin paint.
However, even when a metallic material having an organic coating formed thereon is subjected to draw forming, in order to improve drawability and prevent damage of the coating at the time of the drawing, it is necessary to apply a lubricant to the surface of the material.
Japanese Examined Pat. Publication No. 01-36519 proposed by the present inventors teaches that in drawing a metallic material coated with an organic resin, an aqueous oil-in-water emulsion prepared from a liquid glyceride, ethanol and a nonionic surface active agent is uniformly applied on the coated surface, and the can after drawing is washed with water in a warm state.
When a metallic material coated with an organic resin is further coated with an ordinary lubricant to improve the drawability, the lubricant on the coating is difficult to remove by degreasing. The lubricant remaining on the coating causes a problem of impairing the delicate flavor of drinks which is an important feature for the drinks. The above prior art technique is significant in that it increases the degreasability and washability while increasing the drawability.
However, the conventional method indispensably requires two steps, that is, can degreasing and washing after drawing and drying after washing. The step number is therefore increased, and the prior art is not sufficiently satisfactory in the point that it requires water resource and thermal energy.
It is conceivable to select a lubricant having an excellent flavor retaining property and being capable of reducing the bearing required for degreasing and washing to a minimum level. In this case, the lubricant left on the surface of the film markedly impairs the printability of the outer surface of the can, and the adhesion of the ink layer to the can is reduced.


DISCLOSURE OF THE INVENTION

It is therefore an object of this invention to eliminate the defects of the conventional method of producing a metallic can by drawing from a metallic material having an organic resin coating, and to provide a method for improving the printability and the flavor retaining property while omitting the degreasing and washing steps after drawing.
According to this invention, there is provided a method of producing a metallic can by subjecting a metallic material having an organic resin coating to single-staged or multiple-staged drawing, which comprises uniformly coating a saturated hydrocarbon lubricant on the surface of the organic resin coating of the material, drawing the material after coating, heating the can obtained by drawing, and thereby volatilizing a major portion of the lubricant adhering to the can.
The saturated hydrocarbon lubricant is a hydrocarbon lubricant having branched chains, in which the branches are contained in an amount of at least one branch per 2 to 10 carbon atoms of the main chain. Further, in the lubricant used in the present invention, the number of branched chains having a carbon number of 1 is at least 70% of the number of entire branched chains present in the

REFERENCES:
patent: 2245639 (1941-06-01), Bartlett
patent: 2590451 (1952-03-01), Perry
patent: 3124531 (1964-03-01), Whetzel
patent: 3162310 (1964-12-01), Tiberiis
patent: 3250103 (1966-05-01), Beaubien
patent: 3258319 (1966-05-01), Cox
patent: 3832962 (1974-09-01), Rolles
patent: 3984599 (1976-10-01), Norton
patent: 4428851 (1984-01-01), Hisamoto et al.

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