JP2000335573A - Method for repairing resin film on inner surface of pail can, and pail can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a resin film on the inner surface of a pail can in high quality and at low costs, and a pail can repaired by the method. SOLUTION: A damaged area 23 is heated to a temporary adhering temperature to affix a repairing resin film 25 on the damaged area 23 and thereafter, the film 25 in the area 23 and an inner resin film 21 of a can are heated to an adhering temperature. By heating in two stages in that manner, the damaged resin film on the inner surface of the can and the film 25 are fused and adhered to the inner surface of the can. Thus, an inexpensive repairing work of high quality can be performed, providing a repaired pail can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a resin film adhered to an inner surface of a pail specified in JIS (Japanese Industrial Standard) Z1620, and a pail repaired by the repair method.

[0002]

2. Description of the Related Art In a pail specified in JIS Z1620, it is conceivable to attach a resin film to the inner surface of the pail in order to prevent corrosion of the inner surface of the pail by contents to be stored. As a method for manufacturing such a film-attached pail, a flat steel plate to which the above-mentioned resin film has been applied in advance is formed into a cylindrical shape, and a joining portion serving as a so-called seam portion extending in the axial direction of the cylinder is welded. Then, a method of forming a can body portion, and further winding at least a main plate on which a resin film is stuck to the can body portion to produce a can body can be considered.

The above-mentioned pail can is provided with a hanging handle 2 as shown in FIG. 5 or a handle 7 as shown in FIG.
There is a type provided with. In the case of the pail 1 provided with the hanging hand 2, a mounting bracket 3 called an ear is attached to the outer surface of the pail can body 4 by spot welding in order to support the hanging hand 2. Further, in the case of the pail 6 provided with the handle 7, the mounting bracket 8 for supporting the handle 7 is attached to the outer surface of the top plate 9 of the pail by spot welding.

[0004] Therefore, in some cases, the metal fittings 3 and 8 are welded to the pail body 4 and the top plate 9 with respect to the film-attached pail can made by the above-described manufacturing method. In this case, the metal fittings 3 and 8 are attached to the pail can 4
When welding to the top plate 9, since the welding method is spot welding and does not melt to the inner surface of the can as described above, the inner surface portion of the pail can body 4 and the top plate 9 corresponding to the mounting location is The resin film is not removed.

[0005]

However, although the mounting brackets 3 and 8 can be mounted by spot welding,
The resin film on the inner surface portion corresponding to the mounting portions of the mounting brackets 3 and 8 is melted by the heat of welding to form holes, and there is a problem in the corrosion resistance and the like at the mounting portions of the mounting brackets 3 and 8. Occurs. As a repair method for such a melted portion, for example, a method of applying a liquid paint or a powder paint to the melted portion is considered,
There is a problem that the work efficiency is poor and the cost of the product is increased. Therefore, a method of repairing the resin film on the inner surface of the pail corresponding to the mounting bracket when the mounting bracket is welded to the film-attached pail can not be established at present. The present invention has been made in order to solve such a problem, a problem does not occur in the inner surface of the can corresponding to the mounting bracket, such as corrosive and inexpensive, a method for repairing a resin film on the inner surface of a pail can, and An object of the present invention is to provide a pail can repaired by the repair method.

[0006]

According to a first aspect of the present invention, there is provided a method for repairing a resin film on the inner surface of a pail, which comprises attaching the resin film to the inner surface of the can without removing the resin film on the inner surface of the pail. When the metal fittings are fixed by welding, in the method for repairing the resin film on the inner surface of the can damaged by the heat of the welding, a repair resin film having a size covering the damaged area of the resin film on the inner surface of the can damaged is prepared. The resin film on the inner surface of the can in the damaged area is heated to a temporary bonding temperature to soften, and the repairing resin film is pasted and temporarily fused to cover the damaged area heated to the temporary bonding temperature. The repaired resin film is heated to a final bonding temperature higher than the temporary bonding temperature and melted, and is permanently bonded to the resin film on the inner surface of the can.

[0007] The pail according to the second aspect of the present invention comprises the first pail described above.
The resin film on the inner surface of the can is repaired by the repair method according to the aspect.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for repairing a resin film on the inner surface of a pail and a pail in which the resin film on the inner surface of the can is repaired by the repair method, which is an embodiment of the present invention, will be described below with reference to the drawings. . In the drawings, the same components are denoted by the same reference numerals. Further, the pail to which the method for repairing the resin film on the inner surface of the pail is applied, as described above, and as shown in FIG. 2, is a pail in which a resin film is previously adhered to the inner surface of the can. A pail 10 corresponding to the pail 1 in which the mounting bracket 3 for mounting the hanging hand 2 shown in FIG. 5 is spot-welded to the outer surface of the can is taken as an example. However, it is needless to say that the mounting bracket 8 shown in FIG. The present invention is also applicable to cans and can achieve the same effect.

In the resin film 21 on the inner surface of the pail, which is affixed to the inner surface of the pail 10, the portion corresponding to the mounting portion of the mounting bracket 3 is provided as described above and as shown in FIG. In this embodiment, there are five molten portions 22 which are melted by the heat of the spot welding when the mounting bracket 3 is fixed, and exist on the circumference corresponding to the outer shape of the mounting bracket 3 in this embodiment. In the present embodiment, the diameter of the circle where the above-mentioned five molten portions 22 exist is about 32 mm. For the pail 10 having such a molten portion 22,
In the present embodiment, the can inner resin film 21 is repaired by fusing one repair resin film 25 to the damaged area 23 including all of the above-mentioned five molten portions 22 by a repair device. This will be described in detail below.

First, the repair device will be described with reference to FIGS. The repair device 51 includes a supply roll 55 of the repair resin film, a drive device 56 for supplying the repair resin film, a cutting device 57, a sticking device 58,
It has a pressing device 59, a lifting device 60, a heating device 62, a transport driving device 63, and a control device 65. A repair resin film is wound around the supply roll 55, and the repair resin film is drawn out of the supply roll 55 by, for example, the driving device 56 having a motor. The pulled-out repair resin film is cut into a size corresponding to the damaged area 23 by the cutting device 57 to become the repair resin film 25. In the present embodiment, as described above, since the diameter of the circle on which the five molten portions 22 exist is about 32 mm, the size of one cut repair resin film 25 is a square having a side of 50 mm. It is. The adhering device 58 adsorbs and holds the cut repair resin film 25 and, for example, uses the lifting device 60 having an air cylinder to move the damaged area 23.
The repair resin film 25 is attached to the damaged area 23 in cooperation with the pressing device 59 having an air cylinder, for example.

The heating device 62 includes a preheating device 621 and a temporary adhesive heating device 622 in the repair device 51.
And a permanent bonding heating device 623. Each heating device 6
21 to 623 are finally the resin film 21 on the inner surface of the can.
And the repair resin film 25 are fused from the inner surface of the pail 10 at least in the damaged area 23.
Is heated. In addition, in the said repair apparatus 51, although all the heating apparatuses heat by hot air, it is not limited to this,
For example, heating using an open flame, a heater, high-frequency heating, or the like may be performed. Further, in the repairing device 51, any heating device performs heating from the inner surface side of the pail 10, but the heating device is not limited thereto, and the outer surface portion of the pail corresponding to the damaged area 23, that is, the mounting bracket 3 is used. And the vicinity thereof may be heated, or both the inside and the outside of the pail may be heated.

The preheating apparatus 621 heats the above heating range to about 100 ° C., and the temporary bonding heating apparatus 622 operates at about 140 to 180 ° C. so that the damaged area 23 has a temporary bonding temperature of about 150 ° C. The heating is performed within a range of about 2,000 g / m 2, and the adhesive bonding / heating apparatus 623 includes at least the repairing resin film 25 in the damaged area 23, preferably the repairing resin film 25 in the damaged area 23,
1 so that the actual heating temperature becomes about 200 ° C.
Heat in the range of about 80 to 210 ° C. If the heating temperature exceeds 220 ° C., discoloration or the like is likely to occur in printing performed on the outer surface of the pail can. Therefore, heating at a temperature lower than 220 ° C. is stopped. The measurement of the preheating temperature, the temporary bonding temperature, and the main bonding temperature by the preheating device 621 was performed by providing a temperature sensor using a thermocouple on the outer surface of the pail can 10, but is limited to this method. Instead, the temperature of the damaged region 23 may be measured using, for example, a radiation thermometer.
For example, the transport driving device 63 having a motor transports the pail 10. The control device 65 controls the operation of each of the components described above, and executes the method of repairing the resin film on the inner surface of the pail can in this embodiment.

The resin film 25 for repair can be the same resin film as the resin film 21 on the inner surface of the can.
A base film made of low-density polyethylene and a film made of linear polyethylene were laminated on one side, that is, the surface in contact with the resin film 21 on the inner surface of the can, with a thickness of about 80 μm. And more preferably about 100 to 150 μm.

A repair operation performed by the repair device 51 having the above structure, that is, a method for repairing the resin film on the inner surface of the pail can be described below with reference to FIG.
In step 1 (indicated by “S” in FIG. 1) shown in FIG. 1, the pail 10 transported by the transport drive device 63 is subjected to the pre-heating device 621 to form the damaged area 23. Is preheated. In step 2, the repair resin film supply driving device 56 is operated to draw out the repair resin film from the supply roll 55, and the cutting device 57 cuts the resin film into the above-described predetermined size. The cut repair resin film 25 is sucked and held by the sticking device 58.

In step 3, the preheated pail can 10 is transported to the place where the temporary bonding heating device 622 is installed, and the temporary bonding is performed so that the damaged area 23 has the target temporary bonding temperature of 150 ° C. as described above. The damaged area 23 is primarily heated by the heating device 622. As described above, the damaged region 23 is first heated to the temporary bonding temperature for the following reason. That is, as described above, since the canned inner surface resin film 21 and the repairing resin film 25 are fused to perform repair of the damaged region 23, the damaged region 23 is heated to the final bonding temperature at a stretch, A method of attaching the repair resin film 25 is also conceivable, but if this method is adopted, the damaged area 23 of the can inner resin film 21 is melted, and the repair resin film 21 is melted on the molten can inner resin film 21. This is because it is difficult to obtain a desired adhesive strength even if 25 is attached. The melting point of the resin film 21 on the inner surface of the can and the resin film 25 for repair is 130 ° C. If the temporary bonding temperature is about 150 ° C., the damaged area 23 of the resin film 21 on the inner surface of the can is softened without melting. The operation in step 2 may be performed in parallel with the operation in step 1 or the operation in step 3
Can be performed in parallel with the above operation.

In step 4, the elevating device 60 operates to move the adhering device 58, and the adhering device 58 holds the damaged region 23 of the resin film 21 on the inner surface of the can heated to the temporary adhering temperature. The above-mentioned repairing resin film 25 is attached. At this time, the pressing device 59 is also operated to support the outer surface side of the pail can 10, so that the attaching device 58 and the pressing device 59 press the repaired resin film 25 to the damaged area 23 to perform temporary bonding. . The pressing operation is performed to the extent that air is not trapped between the can inner surface resin film 21 and the repair resin film 25 when the repair resin film 25 is attached to the damaged area 23, It is less than one second in time.

In step 5, the pail can 10 to which the repair resin film 25 is temporarily bonded as described above is conveyed to the installation location of the main bonding and heating apparatus 623, and at least the repair area in the damaged area 23 is repaired as described above. Resin film 2
5. Preferably, at least the damaged region 23 to which the repair resin film 25 is attached is fixed by the final adhesive heating device 623 so that the repair resin film 25 and the can inner resin film 21 have a target final adhesion temperature of 200 ° C. Secondary heating is performed. By this secondary heating, the repairing resin film 25 and the can inner surface resin film 21 in the damaged area 23 are both melted and fused. Therefore, the repair resin film 25 is bonded to the resin film 21 on the inner surface of the can with a desired adhesive strength, and even if there is a defect such as a pinhole, these are all repaired. The time for performing the secondary heating is determined by the time of the repairing resin film 25 and the resin film 2 on the inner surface of the can.
1 is the time required for melting and fusing together, and heating may be stopped immediately after the fusing and fusing.

In step 6, the repaired pail 10
Is cooled by natural cooling or forced cooling. As described above, according to the method for repairing the resin film on the inner surface of the pail can according to the present embodiment, the technology for repairing the resin film on the inner surface of the pail can corresponding to the mounting bracket is established, and the resin film 25 for repair on the damaged area 23 and the resin Since the film 21 is melted and fused together, it is possible to provide a resin film-attached pail with high quality and stable repair performance.
Further, the repair resin film is inexpensive, and the repair method described above can be said to be an excellent repair method in terms of cost.

In the above-mentioned method for repairing the resin film on the inner surface of the pail, the wound repair resin film is cut to a predetermined size and used. However, the repair resin film 25 cut to the predetermined size is prepared in advance. In advance, this may be used.

[0020]

As described above in detail, according to the method for repairing the resin film on the inner surface of the pail according to the first aspect of the present invention and the pail repaired by the repair method according to the second aspect, the damaged area is temporarily bonded. After heating to a temperature and attaching the repair resin film to the damaged area, the repair resin film in the damaged area was heated to the final bonding temperature. Therefore, the repair resin film is melted and adhered to the damaged resin film on the inner surface of the can, so that high-quality and stable repair can be performed, and there is a problem of corrosiveness on the inner surface of the can corresponding to the mounting bracket. It is possible to provide an inexpensive repair method that does not occur and is inexpensive because the repair resin film itself is inexpensive, and a pail can be repaired by the repair method.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of a method for repairing a resin film on an inner surface of a pail in an embodiment of the present invention.

FIG. 2 is a perspective view illustrating the operation of the repair method shown in FIG.

FIG. 3 is a front view of a repair device that executes the repair method shown in FIG.

4 is a side view of the repair device shown in FIG.

FIG. 5 is a perspective view showing a hanging hand type pail.

FIG. 6 is a perspective view showing a handle-type pail.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pail can, 3, 8 ... Mounting bracket, 21 ... Can inner surface resin film, 23 ... Damaged area, 25 ... Repair resin film.

Claims (3)

[Claims] 1. When the mounting brackets (3, 8) are fixed to the outer surface of a pail with the resin film (21) adhered to the inner surface of the can without removing the resin film on the inner surface of the can, the welding is performed. In the method for repairing the resin film on the inner surface of the can damaged by the heat, a repairing resin film (25) having a size to cover the damaged region (23) of the resin film on the inner surface of the can is provided, The resin film is heated to a temporary bonding temperature to be softened, and the repaired resin film is attached and temporarily fused by covering the damaged area heated to the temporary bonding temperature, and the temporarily fused repaired resin film is removed. A method for repairing a resin film on the inner surface of a pail can, characterized in that the film is heated to a final bonding temperature higher than the temporary bonding temperature and melted, and is permanently bonded to the resin film on the inner surface of the can. 2. The temporary bonding temperature is a temperature that is 10 to 50 ° C. higher than the melting point of the repair resin film, and the final bonding temperature is 180 to 2 degrees higher than the temporary bonding temperature.
The method for repairing a resin film on the inner surface of a pail according to claim 1, wherein the temperature is about 00 ° C. 3. A pail, wherein the resin film on the inner surface of the can is repaired by the method for repairing a resin film on the inner surface of the pail according to claim 1 or 2.