JPS6215261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing can body materials, and in particular, in order to prevent rust from occurring at the joints of can body materials, synthetic resin powder is applied to the joints of can body materials. The present invention relates to a device for processing.

Conventionally, when producing body materials for cans, for example 18 cans, it was possible to directly electrically weld the joint ends of the can body materials if the can body materials were tinned, but since this tin plating was expensive, it was usually not possible. is commonly known as ``Teen-free'', which is cheaper than chrome, aluminum, etc.
A treated steel plate known as
Since electric welding cannot be performed in this state, the joining part is ground in advance with a grinder, so to speak, to bare the bare surface of the iron, and then electric welding is performed there. We are trying to prevent the occurrence of However, since this correction paint is treated with a solvent, it cannot be applied thickly, making it difficult to apply a sufficient and uniform anti-corrosion layer, which leads to the formation of rust, which poses the problem that it cannot be used as food cans. Ta.

The present invention has been developed in view of these problems, and uses a synthetic resin powder instead of a solvent-based correction paint, and electrodeposit this powder on the joint area of the can body material, thereby eliminating the need for the conventional method. It aims to solve problems.

That is, the apparatus for producing can body materials according to the present invention, for the above-mentioned purpose, is capable of manufacturing bent can body materials by forming a pipe for pumping and supplying synthetic resin powder so as to be able to freely enter into the bent can body material. Before joining the edges of the materials, a pipe for pumping synthetic resin powder is inserted into the bent can body from the unjoined edges, and then the unjoined edges are joined and then the joint is completed. It is possible to form a rust prevention layer by electrodepositing synthetic resin powder on the inner surface of the part, and more specifically, a wide-mouthed nozzle and a powder supply part regulating part are installed at the tip of the pipe. A nozzle guide/mask body is provided which is entirely box-shaped with an open bottom, and this nozzle is provided with a net covering the entire nozzle injection port for adjusting the powder injection pressure and for interference and rectification during powder injection. A first anode for anodizing the powder is placed near the nozzle, and a second anode is provided along the longitudinal direction of the nozzle guide/mask body for anodizing the powder. It is characterized by being provided with an anode.

Details will be explained below based on the drawings.

First, an outline of the process of using the can body material manufacturing apparatus according to the present invention will be explained. In Figure 1, 1
The material 2 is a material for a can body having a quadrilateral shape, and is sequentially bent in a desired pressing or other processing step to form a material 2 having a rectangular cross section. Both edges 2a of this material 2,
2b is not yet joined, and a pipe 8 for supplying synthetic resin powder into the rectangular material 2 through the gap between both edges 2a and 2b, and a wide-mouthed nozzle 3 provided at the tip of the pipe 8 are inserted and arranged. Ru. Thereafter, both edges 2a and 2b of this material 2 are joined in the longitudinal direction by means such as electric welding, shearing, or adhesion. Then, a synthetic resin powder 5 is electrodeposited on the inner surface side of this joint part 4, and a rust prevention layer 6 is applied thereto.
is formed. As the powder 5, a powder made of a nylon-based adhesive synthetic resin, preferably having a size of 60 to 150 μ and a melting temperature of 150 to 190° C. can be used. This powder 5 is then anodized while the bonding area 4 is cathodized.
It is electro-deposited on the inner surface side with adjustable thickness and area. In addition, before this electrodeposition process, the joining part 4 of the material 2 is
If the parts are joined by electric welding, the joining part 4 may still be hot, and in this case, the powder 5 will be slightly welded by the heat.

Next, details of this can body manufacturing apparatus will be explained.

7 is a pressure feeding device for powder 5 [see Fig. 1];
For example, this means a compressor, and the powder 5 is pumped and supplied by pneumatic pressure. Reference numeral 8 denotes a pressure-feeding supply pipe for this purpose, which is positioned inside the material 2 having a square cross section through a gap between both edges 2a and 2b of the material 2 of the can body material before being joined. 3 is a nozzle whose injection port 3a is wide-mouthed, and is attached to the tip of a pipe 8, and a mesh body 1 is provided over the entire injection port 3a of the nozzle.
0. This net 10 performs an interference/straightening function to adjust the supply pressure and prevent a large amount of powder 5 from being injected from the nozzle 3 at once. In the illustrated example, three nets are stacked at the opening of the nozzle 3 It is set up as follows. Reference numeral 11 denotes a nozzle guide/mask, which is made of synthetic resin and has a box shape with an open bottom, and is attached to the tip of the pipe 8 like the nozzle 3. 12 indicates a fixing band for its attachment. As shown in FIG. 3, the nozzle guide/mask 11 has a pair of side surfaces facing each other with a gap 13 between them, and a plate-shaped second anode 14 is provided on both sides along the longitudinal direction. . In the illustrated example, the second anodes 14 are provided on the inner surfaces of both sides. As a means for anodizing the powder 5, a rod-shaped first anode 15 located near the nozzle 3 is mainly used, and the second anode 14 serves as a nozzle guide and mask rather than contributing to the anodization of the powder 5. 11 is made the same polarity as the powder 5 to prevent the powder 5 from adhering to its inner surface. However, of course this second anode 1
It is also quite possible to use 4 for anodizing the powder 5. In this case, the second anode 14 may be exposed and provided on the inner surface of the nozzle guide/mask 11. Reference numerals 16 and 17 denote curved guide surfaces, which prevent the nozzle guide/mask 11 from getting caught on both front and rear ends 18 and 19 of the material 2 (see FIG. 1). Reference numeral 20 denotes a guide bar that supports the outside of the material 2 having a rectangular cross section, and is also used as a cathode. The first and second anodes 14, 15 are energized via a lead wire 21, and the guide bar 20 can be turned into a cathode by, for example, being brought into contact with a carbon brush (not shown). Reference numeral 22 denotes a powder recovery hopper, which is provided in advance at a position corresponding to the lower part of the nozzle 3, and when the powder 5 is continuously injected from the nozzle 3 and the material 2 is not located there, the injected powder 5 is
is recovered via vacuum means (not shown).

Next, the operation will be explained based on the drawings.

A pressure pipe 8 and a nozzle 3 provided at its tip are inserted into the gap between the bent can body material 2 with unjoined edges supplied by a desired conveying means, and then The edges 2a, 2b are joined by any desired means and this joint is glued or a powder 5 is subsequently injected from the nozzle 3 to form the joining area 4.
A rust preventive layer 6 is formed on the surface.

The operation of the injection of the powder 5 will be explained in more detail as follows. That is, the suspended powder gas coming through the pressure pipe 8 receives a certain resistance from the net 10 provided over the entire injection port 13a of the nozzle, resulting in an averaged pressure zone around the upper part of the net 10. It passes uniformly through the entire gap in the net 10 while forming a ``nozzle.'' At this time, each mesh in the net 10 functions as if it were a single "nozzle." Therefore, the powder 5 has a "ratsupa-like" shape at the injection port.
It is sprayed without spreading. As a result, the anticorrosive layer 6 having the desired layer thickness and width can be obtained extremely uniformly and quickly from the wide-mouth nozzle 3. Further, a part of the injected powder 5 is reflected and scattered by colliding with the material 3, but this reflected and scattered powder 5 is absorbed into the space 13 defined by the nozzle guide/mask 11. At the same time, since the nozzle guide/mask 11 is made the same polarity as the powder 5 by the second anode 14, the powder is not scattered to the inner surface of the nozzle guide/mask 11. The powder 5 is prevented from adhering and fixing, and the powder 5 can be used efficiently.

Since the apparatus for producing can body materials according to the present invention is as described above, (a) Before joining the edges of the bent can body materials, a nozzle for forming a rust preventive layer is applied from the unjoined edges of the bent can body materials. By inserting a mesh, it is possible to straighten the work flow and improve work efficiency. Therefore, even though the nozzle has a wide mouth, the thickness and width of the rust preventive layer can be easily adjusted, and the rust preventive layer can sufficiently satisfy the rust preventive function required for food cans. can be formed uniformly, efficiently, and quickly; (c) Furthermore, since a nozzle guide/mask is provided and a second anode is provided to make the nozzle guide/mask the same polarity as the powder, scattering of the injected powder is prevented. - It is possible to prevent dissipation and at the same time prevent the powder from adhering to and fixing on the inner surface of the nozzle guide/mask, allowing extremely efficient use of the powder, (d) and the effects of (a) to (c). As a whole, the can body material manufacturing apparatus according to the present invention has the effect that it is possible to provide cans suitable for food use at a low cost, with almost no occurrence of rust.

[Brief explanation of the drawing]

FIG. 1 is a process diagram schematically showing the process of using the apparatus for manufacturing can body materials according to the present invention, and FIG. 2 is a side view of a main part broken away showing an example of the apparatus for manufacturing can body materials according to the present invention. , FIG. 3 is a sectional view taken along the line - in FIG. 2, and FIG. 4 is an enlarged sectional view of the diagonal portion in FIG. 3. 1...Material for quadrilateral can body material, 2...Material with bent square cross section, 2a, 2b...edges,
3... Nozzle, 3a... Spout port, 4... Joining part, 5... Synthetic resin powder, 6... Rust prevention layer, 8...
... Pipe, 10 ... Net body, 11 ... Nozzle guide and mask, 14 ... Second anode, 15 ... First anode, 22 ... Hopper.

Claims (1)

[Claims] 1. A pipe for pumping and supplying synthetic resin powder is formed so that it can freely enter into the bent can body material, and at the tip of this pipe there is a wide-mouthed nozzle for powder injection and a box with an open bottom for controlling the powder supply part. A nozzle guide/mask body having the shape of A first anode for anodizing is facing the powder, and a second anode is provided along the longitudinal direction of the nozzle guide/mask body for making the nozzle guide/mask body the same polarity as the powder. Can body material manufacturing equipment.