Source: http://www.google.com/patents/US7824750?ie=ISO-8859-1
Timestamp: 2015-04-19 04:21:09
Document Index: 317244029

Matched Legal Cases: ['art 106', 'art 106', 'art 17', 'art 17', 'art 17', 'art 17', 'art 18', 'art 17']

Patent US7824750 - Inside-coated metal container and its manufacturing method - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe durability of the inside coating to the deformation processing in the post-processing of the inside-coated metal container having corrosion-resistivity is improved to reduce minor cracks and peelings as far as possible. In an inside-coated metal container 10 in which a high-degree of deformation...http://www.google.com/patents/US7824750?utm_source=gb-gplus-sharePatent US7824750 - Inside-coated metal container and its manufacturing methodAdvanced Patent SearchPublication numberUS7824750 B2Publication typeGrantApplication numberUS 10/489,672PCT numberPCT/JP2002/009537Publication dateNov 2, 2010Filing dateSep 17, 2002Priority dateSep 17, 2001Fee statusPaidAlso published asDE60234849D1, EP1428762A1, EP1428762A4, EP1428762B1, US20040241363, WO2003024812A1Publication number10489672, 489672, PCT/2002/9537, PCT/JP/2/009537, PCT/JP/2/09537, PCT/JP/2002/009537, PCT/JP/2002/09537, PCT/JP2/009537, PCT/JP2/09537, PCT/JP2002/009537, PCT/JP2002/09537, PCT/JP2002009537, PCT/JP200209537, PCT/JP2009537, PCT/JP209537, US 7824750 B2, US 7824750B2, US-B2-7824750, US7824750 B2, US7824750B2InventorsMinoru Takegoshi, Hideki Taguchi, Syoichiro AkaneOriginal AssigneeTakeuchi Press Industries Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (22), Non-Patent Citations (1), Referenced by (1), Classifications (33), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetInside-coated metal container and its manufacturing method
US 7824750 B2Abstract
The durability of the inside coating to the deformation processing in the post-processing of the inside-coated metal container having corrosion-resistivity is improved to reduce minor cracks and peelings as far as possible. In an inside-coated metal container 10 in which a high-degree of deformation processing is applied to the vicinity of an opening of one end after coating the inner surface, the coating films formed by the coating have the first layer 12 with high deformation processing durability laid on an area where the high-degree deformation processing is applied and the second layer 13 with high corrosion resistivity laid on the entire inner surface including the first layer of the metal container. The first layer 12 is made of phenolic epoxy resin coatings containing little phenol component and no pigment, and the second layer 13 is made of phenolic epoxy resin coatings containing much phenolic component and pigment.
This invention relates to an inside-coated metal container. Further relates to a coating film of a metal can processed by necking or threading at the vicinity of the opening after coating its inner surface, or a collapsible metal tube processed by clinching its bottom part after coating its inner surface and charging contents.
Conventionally, a synthetic resin coating with high corrosion resistance is applied on an inner surface of a metal container for protecting the inner surface of the metal container from its contents. As an example of such a metal container with an inside coating film, a metal can 100 with an inside coating film shown in FIG. 15 is known. This metal can 100 comprises a can 101 and a coating film 102 provided on the inner surface. The can 101 is plastic-deformed body of an aluminum sheet by stamping comprising a cylindrical body (side wall) 103, a bottom 104 closing the lower end, a truncated cone like shoulder 105 continuing from the upper part of the cylindrical body, and a cylindrical neck part 106 extending upward from the shoulder. A carting (a bead) 107 winding outside is provided at a top of the neck part 106. A thread 106 a is formed around the neck part.
An inside-coated metal container, in which a high-degree of the deformation processing is applied to the vicinity of the opening of one end after coating the inner surface; comprises the coating film formed by the coating having the first layer with high durability to deformation processing laid at least on an area where the high-degree deformation processing is applied and second layer with high corrosion resistance laid at least on an area where the low-degree deformation processing is applied; and the entire inner surface of the container is covered with the first and/or the second layer. Here, �an area where the high-degree deformation processing is applied� and �an area where the low-degree deformation processing is applied� means deformation processing or plastic processing applied after the coating of the inner surface and does not mean any of the processing prior to the coating of the inner surface. In other words, in the case that no high-degree deformation processing is applied to an area after the coating of the inner surface, it is defined as an area where the low-degree deformation processing is applied, even if it is an area to which the high-degree deformation processing is applied before the coating of the inner surface. �The area where the low-degree deformation processing is applied� includes the area without any plastic processing.
FIG. 1 a and FIG. 1 c are cross sectional views of an embodiment of the metal container of this invention, and FIG. 1 b is an extended cross sectional view of the substantial part of FIG. 1 a. FIG. 2 a and FIG. 2 c are cross sectional views of an embodiment of this invention, and FIG. 2 b is an extended cross sectional view of the substantial part of FIG. 2 a. FIG. 3 is a side view of the other embodiment (threaded impact can) of the metal container of this invention.
The inside-coated metal container of this invention and its manufacturing method is described below referencing the drawings. The inside-coated metal container (metal can) 10 shown in FIG. 1 comprises the can 11 and the coating film (12, 13) coated inside. The can 11 is a mono-block can plastically deforming the metal sheet made of aluminum etc. by stamping. The can 11 comprising the cylindrical body (side wall) 14, the bottom 15 closing its lower end, the truncated cone like shoulder 16 continuing from the upper end of the body, the cylindrical neck part 17 extending upward from the shoulder. The curling 18 winding outward is provided on the upper end of the neck part 17, and the thread 17 a is formed around the neck part. In this embodiment, the coating films (12, 13) is composed of the first layer (foundation layer) 12 having high durability to deformation processing which is provided over the area from upper end of the body 14 to the shoulder 16 and the neck part 17, and the second layer (surface layer) 13 having high corrosion resistance which is provided over the entire inner surface including the first layer 12. This is applicable to a two-piece can in place of the mono-block can.
The effects of the invention are described below referencing examples.
As a material for the first layer having high durability to deformation processing, phenolic epoxy resin type coating compound whose epoxy/phenol ratio (herein after referred to E/P ratio) is 80/20, and for the second layer having high corrosion-resistivity, phenolic epoxy resin type coating compound whose E/P ratio is 70/30 were prepared. The material for the first layer whose thickness was adjusted to be 3 to 5 μm was coated over the entire inner surface of the half-processed product (thickness of the body to be 0.45 mm, and thickness of the bottom to be 1.1 mm) of a bottomed cylindrical threaded impact can whose outer diameter is 53 mm. The material for the second layer whose thickness was adjusted to be 4 to 6 μm was coated by wet on wet process over the entire inner surface of the intermediate including the first layer. The first and the second layer were hardened by the baking process. Further, the shoulder 16 and the neck part 17 were formed by the necking processing, and then the bead part 18 and the thread part 17 a was formed to manufacture the metal container of the example 1.
As the coating compound of the second layer, the same material as used in the example 1 was used excepting that phenolic epoxy resin whose E/P ratio is 70/30 was used, in which titanium oxide whose weight is 53 wt % of the resin was mixed as a pigment.
As the coating compound of the second layer, the same material as used in the example 1 was used excepting that phenolic epoxy urea resin coating compound whose E/P/U (urea) ratio is 60/24/16 was used to manufacture the metal container of the example 3.
As the coating compound of the second layer, the same material as used in the example 1 was used excepting that phenolic epoxy resin whose E/P/I ratio is 78/22 was used to manufacture the metal container of the example 4.
The same procedure as the example 1 was carried out to manufacture the metal container of the comparative 1 excepting that as for the coating film the coating compound of the first layer was only laid on the entire inner surface of the half-processed product.
Comparative 2 to 5
The same procedure as the example 1 was carried out to manufacture the metal container of the comparative 2 to 5 excepting that as for the coating film the coating compound of the second layer of the example 1 to 4 was only laid on the entire inner surface of the half-processed product.
One conditioner for permanent wave (thioglycolic acid series or cysteine series) was charged by half, and laid horizontally for two weeks at 55� C. Blistering in the gas-liquid boundary face, delicate corrosion and the discoloration due to reactant generation of aluminum base were visually observed
The metal container 50 a shown in FIG. 11 a was used for the example 5. As the material for the first layer made of UV ink, free-radical polymerization type acrylic modified epoxy resin was prepared. As the material for second layer having high corrosion-resistivity, phenolic epoxy resin type coating compound having E/P ratio of 70/30 was prepared. The material of the first layer was coated with the thickness of 30 to 670 μm over the entire inner surface of the half-processed can which is a bottomed cylindrical threaded impact can whose outer diameter was 53 mm (thickness of the can body was 0.45 mm and that of the bottom is 1.1 mm). The first layer was illuminated by ultra violet rays whose wavelength was 370 nm for 10 seconds to harden the first layer. And then, the material of the second layer was coated with the thickness of 8 to 12 μm and hardened at 230 degree celcius by baking process for 7 minutes. The shoulder and the neck part were formed by necking processing, and, the bead part and the thread part were formed to manufacture the container, after the forming of the coating film.
As an example, the same metal container as the example 5 in which coating film having only one layer made of UV ink was employed as the comparative 6. The same UV ink as the example 5 was prepared and coated with the thickness of 30 to 70 μm, and then the film was hardened by illumination of ultra violet rays whose wavelength was 370 nm for 10 seconds. Same as the example 5, the shoulder, the neck part, and the thread part were formed to manufacture the container, after the forming of the coating film.
As an example, the same metal container as the example 5 in which the coating film made of phenolic epoxy type resin coating compound having E/P ratio of 70/30 was employed as the comparative 7. This was coated with the thickness of 8 to 12 μm and hardened by baking process at 230� C. for 7 minutes. Same as the example 5, the shoulder, the neck part, and the thread part were formed to manufacture the container.