JPH0457746A - Container coated with ethylene tetrafluoride resin - Google Patents

Abstract

PURPOSE:To contrive an easy manufacture of a container at low costs by a method wherein a relatively thin cold rolled steel plate having its surface pretreated with nickel plating is bent by applying the blank coated with ethylene tetrafluoride resin to the surface of the steel plate and a resin-coated container is obtained by means of welding and double seam joint. CONSTITUTION:A rolled steel plate 1, e.g. in 3X6 size, has a nickel-plated layer 2 preformed entirely over its surface and is coated additionally with ethylene tetrafluoride resin film 3 allocated to the required dimension and cut into a predetermined dimension, whereby there is obtained a metal plate 4 covered with resin except on both edges C and C' of the nickel-plated surface. The metal plate 4 is wound into a hollow form with the nickel-plated faces C and C' overlapped and the overlapped parts are seam welded to form a container body 5. A bottom plate 6 is coated with resin in the same way as the metal plate 4 of the container body 5 and fitted over the same in a liquid tight and integral manner by means of the conventional double seam joint made therebetween. Reference character 8 indicates a handle suitably mounted on the wall of the container body 5 and 9 indicates a pour-out opening provided on the top edge of the container body 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to containers coated with tetrafluoroethylene resin, and in particular, by making it possible to easily and inexpensively form a resin coat on the container, it is possible to easily and inexpensively form a resin coating on the container. This makes it possible to obtain a suitable and inexpensive resin-coated container for containing the following liquids.

[Prior Art] Containers coated with tetrafluoroethylene resin have been known as resin-coated containers of this type.

Then, as a general method for coating a metal plate base material with this tetrafluoroethylene resin, a resin dispersion is spray-painted on the metal plate base material surface that has been previously processed into a predetermined shape.
It is known to perform a firing process after drying. However, so-called foam-coated products that are coated with resin using such a spray coating method tend to entrain air during the resin twisting process, and as a result, air holes may form due to the viscosity of the molten resin during the firing process. Since it was not filled in, pinholes of several lθμ were likely to be formed on the coated surface. This method of forming a coating has the drawback that moisture causes corrosion of the metal base material, and the corrosion resistance of the product cannot be guaranteed.

In addition, resin dispersion is coated on the metal substrate surface in advance using a coating method that does not involve air, such as flow coating method, roll coating method, or rotating case method, and after drying, a baking treatment is performed to prevent coating defects for molding. Many methods are also used in which a resin-coated plate having no resin is created and then molded into a desired shape to produce a product.

However, a problem that arises with such means is that the degree of molding of the resin-coated metal plate is limited to some extent. In other words, if the degree of processing is set to a certain degree of complexity and severe conditions, there is a strong tendency for cranks to occur in the resin coating, and there is also a tendency for thread-like pinholes with an elliptical shape to occur, resulting in limitations in processing. It became difficult to manufacture it into the desired shape.

In addition, since the baking and firing treatment temperature of the resin coating generally exceeds 360 to 400 degrees, the material used as the metal plate base material to which the resin coating is applied is a material with a low melting point or cannot be subjected to surface treatment, such as aluminum or stainless steel. Metal material was used.

[Disadvantages of the prior art] In such a case, to make a product in the shape of a deep container using a resin-coated metal plate, drawing or bending processing is required, but in the former case, a press for forming is required. Equipment and man-hours are required, and the latter is subject to processing limitations due to the thickness of the metal material and the joining method, which limits the degree of freedom in selecting the shape of the container. In particular, when forming a container by bending and joining, it is difficult to bend and join each other with thick metal plates, and when welding, it is difficult to weld the joints, which may require stripping part of the coating or special welding. It was difficult to work, as it required the use of other means.

[Object of the Invention] The object of the invention is particularly to provide a 47
To provide a metal container coated with fluorinated ethylene resin using an inexpensive metal material such as 5pCC, making it easy to manufacture and providing it at low cost.

[Summary of the invention] A relatively thin cold-rolled metal steel plate of approximately 0.2 m/m is bent and welded using a material in which the surface of the metal plate has been previously nickel-plated and coated with tetrafluoroethylene resin. A resin-coated container can be obtained by using each method of single-rolling.

[Example theory +11'll Examples of the present invention will be described below.

Figures 1 (a) and (b) are explanatory diagrams of a rolled metal steel plate plated with nickel and coated with tetrafluoroethylene resin, leaving some of the edges on both sides, and Figures 2.3 and 3 show the state during the forming process. FIG. 4 shows an example of the supply state of the material.

The metal rolled steel plate 1 has, for example, a 3×6 plate size, and is coated with a nickel plating layer 2 on the entire surface in advance, and is further divided into required dimensions and coated with a 4-fluoroethylene resin coating 3, and then cut into the required dimensions. As a result, a metal plate 4 is obtained in which both side edges c and c' of the nickel-plated surface are coated with resin.

In addition, the tetrafluoroethylene resin coating used in the practice of this invention is of a low temperature curing type, and its properties include a homopolymer of vinylidene phthalide or 50 mol% or more of vinylidene fluoride. It is a copolymer with a residual amount of polymerizable monomer, and the apparent melt viscosity is 1 at the measurement temperature.
5.000 under the condition of 50℃ shear rate 100sec'
~20,000 poise is used. The sprayed resin coating is baked at a temperature 50 to 60° C. higher than the melting point of the resin and lower than the decomposition temperature.

5 is a container body in which the metal plates 4 described above are wound in a hollow shape, and the nickel-plated surfaces C9C'' are polymerized and welded by seam welding, etc. The areas of the nickel-plated surfaces c and c' can be seam welded. It is necessary that the width be as small as possible, and it is particularly preferable to make the width thin.

Reference numeral 6 has an open bottom, which is coated with resin under the same conditions as the metal plate 4 of the container body 5, and is integrally attached to the container body 5 in a liquid-tight manner by well-known seaming. Reference numeral 8 designates a handle that is appropriately attached to the wall surface of the container body 5, and reference numeral 9 designates a spout provided at the upper end edge of the container body 5.

In addition, this 5I! In the embodiments in light, the coating thickness after drying is suitably 50 μm or less, and there is a drawback that increasing the thickness increases the risk of localized whitening occurring when folded.

This invention is a resin-coated plate in which tetrafluoroethylene resin is coated on the surface of a nickel-plated metal plate with side edges left, and after drying, a baking process is performed at a temperature of 200 to 210°C for 5 to 15 minutes. A container body was formed by winding and welding the plated surfaces, and a bottom hole coated with polytetrafluoroethylene resin under the same conditions as the container body was joined by seaming. Since inexpensive nickel-plated steel sheets can be used as the material for the container, and low-temperature baking allows drying, equipment costs such as drying ovens can be reduced, and the container is easy to manufacture and has a high quality tetrafluoroethylene coated container. be able to.

[Brief explanation of the drawing]

Figure 1 shows the processing state of resin coating on a metal steel plate, (a
) shows a plane, and (b) shows a cross section. FIG. 2 is an explanatory diagram of a state in which winding layers of metal steel sheets are joined. FIG. 3 shows the process of forming the container, in which (a) is a first stage of bending, and (b) is a cross-sectional view after bending and joining. FIG. 4 is an explanatory diagram of the supply state of metal steel sheets. 1 is a metal rolled steel plate, 2 is a plating layer, and 3 is a resin coating. Figure 1 Figure 2

Claims (1)

[Claims] Tetrafluoroethylene resin is applied to the surface of the nickel-plated metal plate, leaving the side edges, and after drying, it is fired for two
A container body is formed by winding a resin-coated plate coated at a temperature of 00 to 210°C for 5 to 15 minutes and welding and joining the plated surfaces. A tetrafluoroethylene resin-coated container made by joining resin-coated bottom plates by seaming.