Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1985-09-24
1987-08-11
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156287, 156293, 1563099, 156321, 156521, 156567, 413 77, 493276, 493292, B29C 6300
Patent
active
046859896
DESCRIPTION:
BRIEF SUMMARY
TECHNOLOGICAL FIELD
This invention relates to a process and an apparatus for producing a welded can body having an organic coated welded part. More specifically, it relates to a process and an apparatus for producing a welded can body having an organic coated welded part in which the exposed metal portion at the welded part or its vicinity is covered with an organic resin or an organic resin composition comprising an inorganic material such as a pigment, metal, etc.
BACKGROUND TECHNOLOGY
Heretofore, the following methods have been proposed for organic coating of the welded part, i.e. the exposed metal portion.
Firstly, a method has been proposed which comprises coating a liquid paint on the exposed metal portion by spraying or roll coating, and drying and curing it by heating thereby to coat the welded part. By this first method, it is difficult to form a coated film of a uniform thickness along the shape of the welded part, and it has the disadvantage that to prevent the exposure of the metal completely, the coated film undesirably thicker becomes in part. The thick portion tends to foam during heating and result in the formation of pores. To prevent foaming, the heating time should be prolonged, and the solvent should be evaporated slowly. This is uneconomical and undesirable.
Secondly, a method has been proposed which comprises coating a synthetic resin powder on the exposed metal portion of the welded part by electrostatic coating. The second method, however, has the defect that pores tend to form, and a problem is liable to arise in the film forming ability of the resin.
Thirdly, a method has been proposed which comprises providing a nozzle for injecting a molten resin in proximity to the exposed metal portion, moving the nozzle and a can body relative to each other, injecting the molten resin in a tape form, and successively adhering it to the exposed metal portion, thereby to organic-coat the welded part, as disclosed in U.S. Pat. No. 3,077,171, particularly FIG. 7 thereof. According to the third method, it is necessary to carry the molten resin as far as the tip of the welding roll electrode in a welding machine and form a film of the resin on the exposed metal portion so that it continuously has a uniform width and thickness. This requires a sophisticated technique, and involves difficult maintenance.
Fourthly, a method has been proposed which comprises providing a roll within a can body, and successively press-adhering a tape-like resin to the exposed metal portion thereby to organic-coat the welded part, as disclosed in U.S. Pat. No. 3,077,171, particularly FIG. 6 thereof, and Japanese Laid-Open Patent Publication No. 17224/1981. According to the fourth method, it is technically difficult to carry the tape-like resin to the tip of the welding roll electrode, for example, and to cut it to a length corresponding to the length of the can. In other words, the fourth method has the disadvantage that it is difficult to adjust the tape-like resin accurately to the desired size, and to apply it accurately to the desired position. This disadvantage is remarkable especially when the can body has a small inside diameter. Furthermore, since the fourth method normally uses rolls made of an elastic material such as rubber and having a restricted outside diameter, the rolls disadvantageously undergo marked wear. According to this method, the tape-like resin should be pressed by the roll under a relatively strong pressure along the surface of the welded part. This leads to the inherent practical defect that the tape-like resin extends in a zig-zag fashion and is not properly adhered, and the support used for supporting the roll shakes to give rise to various problems.
The fourth method further has the following problems.
Firstly, to adhere the tape-like resin to the welded part of the can body with a sufficient adhesion strength, it is necessary to heat the welded portion of the metallic can body to a relatively high temperature (for example, at least 100.degree. C. above the softening point) and to press t
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patent: 3898945 (1975-08-01), Rohowetz
patent: 4346814 (1982-08-01), Rentmeester
patent: 4477298 (1984-10-01), Bohannon et al.
Imatani Tsuneo
Matsuno Kenji
Taira Kazuo
Toyoshima Makoto
Yasumuro Hisakazu
Dawson Robert A.
Toyo Seikan Kaisha Limited
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