JP2001286959A - Resin film sticking method, and method for correcting weld seam part of welded can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately stick a resin film for correction to one side of a plate- like body, an inner side of a cylindrical body and a welded can seam of a can body, to reduce the manufacturing steps, to increase the yield, and to reduce the price of products. SOLUTION: Before the resin film 5 such as the resin film for correction is stuck to one side of the plate-like body, the inner side of the cylindrical body and the welded can seam of the can body 1 which are carried, press rolls 7, 7 are turned by a predetermined angle in the reverse direction to return a cut tip of the resin film 5 by a predetermined quantity, and then, the press rolls 7, 7 are rotated in the forward direction in an interlocking manner with the insertion of the plate-like body, the cylindrical body and the can body 1 in the press rolls 7, 7, and the resin film 5 is stuck to the inner surface of the can body 1 over the entire length while agreeing the cut tip of the resin film 5 with the tip of the can body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film sticking method for sticking a resin film to one surface of various plate-like bodies or to the inner surface of various cylindrical portions, and a method of applying a correction resin film to a welding seam portion of a welding can. The present invention relates to a method for correcting a weld seam of a welding can to be attached.

[0002]

2. Description of the Related Art For example, a welded can has been put into practical use as a can body in which a metal plate is rounded and / or bent and formed into a cylindrical shape, and ends thereof are joined to form a can body. Welding cans include tin-plated steel sheets (tinplate), nickel-plated steel sheets, electrolytic chromic acid-treated steel sheets (tin-free steel), and steel sheets that have been subjected to surface treatment such as electrolytic chromic acid-treated steel sheets with island-like tin-plated layers. A metal plate, or a coated plate obtained by coating and / or printing on these metal plates except for edges to be welded, or a resin coated plate coated with a thermoplastic resin instead of being coated on the metal plate It is obtained by preparing a blank, rounding and / or bending it, forming it into a tubular shape, overlapping the ends thereof, and performing electric resistance welding. In the case of welded cans, the surface temperature of the welded seam is high, so if a steel sheet with a surface treatment is used, the surface treatment layer of the welded seam will be destroyed, exposing the ground steel, or making painted or resin-coated plates. Is used, the welded seam and its surroundings are left unpainted or uncoated.

As described above, since the metal surface of the weld seam portion and its peripheral portion is exposed in the welding can, it is indispensable to correct the coating of this portion from the viewpoint of corrosion resistance. As a method of correcting the weld seam portion, conventionally, correction coating with an organic solvent-based coating, water-based coating, or powder coating has been generally performed, but in recent years, correction of coating with a coating from the viewpoint of environmental protection has been performed. Instead of the method, a correction method of attaching a thermoplastic resin film to a welded seam portion and its peripheral portion has been attempted.

For example, Japanese Unexamined Patent Publication (Kokai) No. 61-74742 discloses a method in which a large number of welding cans are arranged in tandem and continuously conveyed so that the welding seams of the cans are aligned on the same line. Preheat the welding seam part to the melting point of the tape-shaped resin film or more, then feed out the tape-shaped resin film to the welding seam part and affix it with a pair of pressing rollers, and further reduce the welding seam part to the preheating temperature or less. Reheat,
Next, a method for correcting the inner surface of a welded can joint, which comprises cutting the resin film between the front and rear can bodies, is disclosed.

The correction method disclosed in Japanese Patent Application Laid-Open No. 61-74742 discloses a welding machine for continuously and rapidly performing seam welding as a part of a production system of a small and large-scale can body such as a beverage can. In order to be able to perform the correction process while continuously transporting the can body so that the welding seam part is aligned on the same line,
It is characterized by using a long treatment facility. On the other hand, welding cans are not only small cans like beverage cans,
It is also widely used in large rectangular gallons (18-liter cans).

[0006]

As a method of sticking a correction resin film to a welding seam portion of a can body as shown in FIG. 8, a predetermined interval is continuously provided by a conveying means as shown in FIG. Are heated above the melting point of the resin film 51, and the can bodies 50 are successively inserted into the pair of outer pressure rolls 52 and 53 and clamped, and fed out from a film supply means (not shown). After the resin film 51 to be wound around the inner pressure roll 52,
The resin film 51 is adhered to the inner surface of the can body 50 by passing between the outer press rolls 52 and 53, and then the resin film 51 is
It is conceivable to cut with a cutter 54 at a location corresponding to the rear end of the can body 50. In addition, 55 is a guide roll. However, as shown in FIG. 8, when the first correction of the can body 50 is completed, the resin film 51 is pressed by the inner and outer pressure rolls 52 and 53. Therefore, in this state, the next can body 50 is inserted into the inner and outer pressure rolls 52,
When the film is inserted into the nip 53, the correction is performed in a state where the surplus film 51 a of, for example, about 20 mm comes out from the tip of the can body 50. Therefore, in order to obtain a final product, a step of separately removing the surplus film 51a is required, which increases the number of manufacturing steps, increases the yield, and increases the product price. The same applies to the method of attaching a resin film using upper and lower pressure rolls on the surface of various plate-like bodies and the method of attaching the resin film using inner and outer pressure rolls to the inner surface of various cylindrical bodies. Problems arise. The present invention has been made to solve the above-mentioned drawbacks of the prior art, and the number of manufacturing steps can be reduced by precisely attaching a resin film to a plate-like body, a tubular body, and a can body. An object of the present invention is to provide a method of attaching a resin film and a method of correcting a welded seam portion of a welding can, which can reduce the cost as much as possible while increasing the yield.

[0007]

According to the present invention, a plurality of plate-like bodies continuously conveyed at predetermined intervals by a conveying means are heated to a temperature equal to or higher than the melting point of the resin film, and the plate-like bodies are heated by a pair. After the resin film fed out from the film supply means is wound around the pressure roll, the sheet is inserted into the nip of the upper and lower pressure rolls, and is pressed between the upper and lower pressure rolls. Affixed on one side, then, in a resin film adhering method such that the resin film is cut at a position corresponding to the rear end of the plate-shaped body, the resin film over the entire length of one surface of the plate-shaped body After sticking and cutting, before adhering the resin film to one surface of the plate-like body to be conveyed next, rotate the pressure roll in the opposite direction by a predetermined angle to set the cutting end of the resin film to one. Quantitative return, then
In conjunction with the insertion of the plate into the nip of the lower pressure roll, the upper and lower pressure rolls are rotated in the forward direction so that the cutting edge of the resin film matches the edge of the plate.
The resin film is stuck on one surface of the plate-like body over the entire length.

According to the present invention, a plurality of cylindrical bodies conveyed continuously at predetermined intervals by a conveying means are heated to a temperature not lower than the melting point of the resin film, and the pair of cylindrical bodies are press-bonded to each other. After being inserted into the nip of the roll and squeezed, the resin film fed from the film supply means is wound around the inner pressure roll, and then passed between the inner and outer pressure rolls to the inner surface of the cylindrical body. Attach, then, in a resin film sticking method such that the resin film is cut at a position corresponding to the rear end of the tubular body, the resin film is attached over the entire length of the inner surface of the tubular body After cutting, before adhering the resin film to the inner surface of the cylindrical body to be conveyed next, the inner and outer pressure rolls are rotated in the opposite directions by a predetermined angle to keep the cutting end of the resin film constant. Pull back the amount, and then rotate the inner and outer pressure rolls in the forward direction in conjunction with the insertion of the cylindrical body into the nip of the inner and outer pressure rolls to cut the cutting end of the resin film into the cylindrical shape. The resin film is stuck on the inner surface of the tubular body over the entire length while being aligned with the tip.

According to the present invention, there is further provided a can body formed by rounding and / or bending a metal plate to form a tube and seam welding the end thereof in a direction perpendicular to the welding direction of the welding seam portion. A plurality of pieces are continuously transferred using the first transfer means, and the welded seam portion is heated to a temperature equal to or higher than the melting point of the correction resin film using the preheating means provided in the middle of the first transfer means. While transporting the body using the second transporting means provided to transport the body in a direction perpendicular to the transporting direction of the first transporting means,
1) The correction resin film is continuously supplied from the correction resin film supply means to the heated weld seam portion on the inner surface side of the can body, and is brought into contact with the weld seam portion. A film bonding step of pressing the correction resin film on the welded seam portion by pressing the outer and inner pressure rolls of the pair, and 2) then, the rear end of the welded seam portion is the inner and outer sides. A film cutting step of cutting the resin film by stopping rotation of the inner and outer pressure rolls while transporting the can body after passing through the pressure roll, and 3) then, using a post-heating means, A reheating step of reheating the welded seam portion to a temperature near the melting point of the correction resin film; 4) a reheating step using a pair of repressurizing rolls disposed outside and inside the welded seam portion of the can body. Re-pressurizing step of pressurizing, 5) Positive the can barrel finishing consists in performing a first return can body back to the transport means step, further,
After attaching and cutting the resin film over the entire length of the welding seam portion provided on the inner surface of the can body, before attaching the resin film to the welding seam portion of the can body that is next conveyed, The inner and outer press rolls are rotated in the opposite direction by a predetermined angle, and the cutting end of the resin film is pulled back by a certain amount.After that, the inner and outer press rolls are interlocked with the insertion of the can body into the nip, The resin film is attached to the inner surface of the can body over the entire length while rotating the outer pressure roll in the forward direction so that the cutting end of the resin film is aligned with the end of the can body. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for correcting a weld seam of a welding can according to one embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a correction device used in a method for correcting a weld seam portion of a welding can according to the present invention, and FIG. 2 is a plan view of the correction device. (1) In FIG. 2, a surface-treated steel plate such as tinplate or tin-free steel, or a metal plate coated with an organic resin paint or coated with a thermoplastic resin such as polyolefin, polyamide, or polyester is rounded and / or bent. Can body 1 formed by welding the rear end part which has been processed and formed into a cylindrical shape
(1a) is arranged so that the welding seam portion is perpendicular to the transport direction (note that the description is in the perpendicular direction, but it is not necessarily perpendicular, but it is sufficient if it is non-parallel). (2) Next, the welding seam portion of the can body 1 is turned to the second position by using the first conveying means 2 such as a roller conveyor or a hanging conveyor so that the welding seam portion faces downward on the paper surface. The first conveying means 2 is conveyed until it comes directly above a preheating means 3 such as a gas burner provided on the path of the first conveying means 2. At this position, the welding seam portion of the can body 1 (1b) is heated to a temperature equal to or higher than the melting point of the correction resin film by using the preheating means 3. The preheating means 3 may be kept in an overheated state at all times, or heating is started after the can body 1 comes directly above the preheating means 3, and after the can body 1 is heated for a certain period of time, the overheating is stopped. This cycle may be repeated for each can body 1.

(3) Next, the can body 1 (1b) is transported in a direction perpendicular to the transport direction of the first transport means 2 by a transport means 4 such as a caller conveyor or a hanging conveyor, ie, as shown in FIG. Two rubber rolls (e.g., two rolls) that are transported from left to right on the paper surface of FIG. 2 and that are provided in the middle of the second transport means 4 and arranged so that each one is located inside and outside the can body 1 A pair of repressurizing rolls 9, 9 made of silicon rubber rolls, etc., passes between the released rolls, and the right end of the welded seam portion is arranged such that one of them is located inside and outside of the can body 1. Of the pair of two rubber rolls (for example, a silicone rubber roll), the roll is transported until it comes into contact with the closed nip of the outer pressure rolls 7.

(4) Next, the correction resin film 5 is wound into a nip between the inner and outer press rolls 7, 7 in a coil shape, and a coiler or the like that operates in synchronization with the outer press rolls 7, 7 is used. The correction resin film 5 such as polyamide or polyester having a width larger than the width of the welded seam portion and the portion of the periphery of the welded seam portion where no coating or resin coating is applied is supplied from the correction resin film supply means 6 to the guide roller 11. Through the inner and outer press rolls 7, 7, and continuously supplied to the nip so as to be brought into contact with the heated welding seam portion of the can body 1.
7 is rotated to supply the welding seam portion and the correction resin film 5 to the nip and sandwich the nip, and the can body 1 (1c) is conveyed to the right by the second conveying means 4 to the welding seam portion. The correction resin film 5 is bonded by pressure bonding.

(5) After adhering the correction resin film 5 to the welding seam in this manner, the can body 1 (1c) is conveyed rightward on the paper by the second conveying means 4, The rotation of the inner and outer press rolls 7, 7 is stopped, and the supply of the corrective resin film 5 from the corrective resin film supply means 6 is stopped in synchronism therewith to apply tension to the corrective resin film 5 and Then, the correction resin film 5 is cut by using a film cutter 12 including a knife-edge type heat heater (a U-shaped nichrome wire heater or the like). (6) Next, the can body 1 (1c) having the correction resin film 5 adhered to the welded seam portion is post-heated by the second transport means 4 to the right on the paper surface, such as a gas burner or an electric heater. It is further transported to the position where the means 8 is provided. When the entire welding seam portion of the can body 1 (1c) comes directly above the heating section of the post-heating means 8, the right end of the can body 1 is detected by the detecting means 10 such as a limit switch or a photoelectric tube, and the second conveying means is detected. 4
Is stopped, and the welded seam portion to which the correction resin film 5 is adhered is brought to a temperature near the melting point of the correction resin film 5 (melting point ± 5
-10 ° C) for a certain time (5-60 seconds). (7) Next, after the can body 1 comes directly above the post-heating means 8, the heating means 8 starts heating the can body 1, and after heating the can body 1 for a certain period of time, stops the heating. May be repeated for each can body, or may be kept in a constantly heated state. By this reheating treatment, the adhesive strength of the correction resin film 5 to the weld seam is improved.

(8) After the heating for a certain period of time, the transport direction of the second transport means 4 is reversed, and the can body 1 is transported from the right to the left on the paper surface in the direction of returning to the first transport means 2. At this time, first, the can body 1 is passed through the inner and outer pressure rolls 7, 7. At this time, the nip of the two rolls is released to pass between the rolls. Then, the can body 1 is conveyed to the left as it is, and passes through the closed nip of the re-pressing rolls 9, 9 to re-press the welding seam portion. By this re-pressurization,
The adhesive strength of the correction resin film 5 to the weld seam portion is further improved. (9) The can body 1 whose welding seam portion is repressurized is transported as it is to immediately above the pre-heating means 3 provided on the path of the first transport means 2. At this time, the preheating means 3 is in an operating state, and the welding seam portion of the can body 1 (1b) to which the correction resin film 5 is adhered may be heated, or the operation of the preheating means 3 may be stopped. Thus, the can body 1 (1) may not be heated. (10) Next, the can body 1 (1b) is transported above the plane of FIG. 2 using the first transport means 2 (can body 1 (1d)).
The work of correcting the weld seam is completed.

By repeating the above steps, it is possible to continuously correct the weld seams of a large number of can bodies 1, but as in the case of the conventional example shown in FIG.
When the correction of the first can body 1 is completed, the tip of the correction resin film 5 is pressed by the inner and outer pressure rolls 7, 7. Therefore, when the next can body 1 is inserted into the nip of the inner and outer pressure rolls 7, 7 in this state, the can body 1
Is corrected in a state in which, for example, a surplus film of about 20 mm comes out from the tip of. Therefore, in order to obtain a final product, a step of separately removing the surplus film is required, which increases the number of manufacturing steps, increases the yield, and increases the product price.

Therefore, in this embodiment, in order to eliminate the processing of the surplus film, as shown in FIG. 3, after the correction is completed, the inner and outer pressure rolls 7, 7 are driven to rotate by a predetermined angle θ. Then, the tip of the correction resin film 5 is pulled back by a fixed amount. The amount of retraction can be easily adjusted by changing the predetermined angle θ in consideration of the characteristics of the correction resin film 5 and the like. Thereafter, if the above-described correction work is performed, as shown in FIG. When the can body 1 is inserted into the nip between the inner and outer press rolls 7, 7, the tip of the correction resin film 5 and the tip of the can body 1 can be located at substantially the same position. Therefore, it is possible to effectively prevent the occurrence of excess tape in a product manufactured through the subsequent steps. In this case, in order to more reliably perform the above-described film correction, as shown in FIG. The tip of the correction resin film 5 is slightly (1-2 m) longer than the tip of the can body 1.
m). This is because, as shown in FIG. 6, the tip of the correction resin film 5 slightly longer than the can body 1 is shrunk by the subsequent reheating (secondary heating), and the tip can be accurately aligned at that time. It is. As shown in FIG. 7, the tip of the contracted resin film for correction 5 is formed into a uniform thickness by the re-pressing rolls 9 and 9.

As described above, in this embodiment, the inner and outer pressure rolls 7, 7 are fixed at a predetermined angle before the correction resin film 5 is attached to the welding seam portion of the can body 1 to be conveyed next. θ, the cutting tip of the correction resin film 5 is pulled back by a fixed amount, and then the inner and outer pressure rolls 7,
7, the inner and outer press rolls 7, 7 in conjunction with the insertion of the can body 1 into
Is rotated in the forward direction so that the correction resin film 5 is adhered to the inner surface of the can body 1 over the entire length thereof while the cut end of the correction resin film 5 is aligned with the front end of the can body 1. The resin film 5 can be accurately adhered to the welded seam of the can body 1, thereby reducing the number of manufacturing steps, increasing the yield, and reducing the product price.
In the above-described embodiment, the present invention has been described with reference to the method of correcting the welding seam portion of the welding can. Even when attaching a resin film to the inner surface of the cylindrical body,
Similarly, the resin film can be accurately adhered to a plate-like body or a tubular body, and the number of manufacturing steps can be reduced, the yield can be increased, and the product price can be reduced.

[0018]

According to the present invention, before a resin film such as a correction resin film is adhered to one surface of the plate-like body to be conveyed next, the inner surface of the cylindrical body, or the weld seam of the can body, the pressure-bonding is performed. Rotate the roll in the opposite direction by a predetermined angle, pull back the cutting end of the resin film by a certain amount, and then rotate the pressure roll in the forward direction in conjunction with the insertion of the plate, cylinder, and can into the nip of the pressure roll. The resin film for correction was adhered over the entire length of the inner surface of the can body while rotating so that the cutting end of the resin film for correction was aligned with the tip of the can body. It can be attached to a welded can seam, reducing the number of manufacturing steps, increasing the yield, and reducing the product price.

[Brief description of the drawings]

FIG. 1 is a front view of a correction device used in a method for correcting a seam welded portion of a welding can according to the present invention.

FIG. 2 is a plan view of the same device.

FIG. 3 is a process explanatory view of a method for correcting a seam weld of a welding can according to the present invention.

FIG. 4 is a process explanatory view of a method for correcting a seam weld of a welding can according to the present invention.

FIG. 5 is a process explanatory view of a method for correcting a seam weld of a welding can according to the present invention.

FIG. 6 is a process explanatory view of a method for correcting a seam weld of a welding can according to the present invention.

FIG. 7 is a process explanatory view of a method for correcting a seam weld of a welding can according to the present invention.

FIG. 8 is a process explanatory view of a conventional method for correcting a seam weld of a welding can.

FIG. 9 is a process explanatory view of a conventional method for correcting a seam weld of a welding can.

[Explanation of symbols]

 Reference numerals 1a, 1b, 1c, 1d: can body, 2: first conveying means, 3, pre-heating means, 4, second conveying means, 5, correction resin film, 6, correction resin film supply means, 7 ... inner and outer pressure rolls, 8 ... post-heating means, 9 ... re-pressing rolls, 10 ... detection means, 11 ... guide rolls, 12 ... film cutter

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // B29K 301: 12 B29K 301: 12 B29L 9:00 B29L 9:00 23:00 23:00 F term (reference) 4F211 AC03 AD03 AG01 AG03 AG07 AH55 AP06 AR06 AR07 TA01 TC03 TC04 TC23 TD11 TJ10 TJ15 TJ27 TQ03 TQ09

Claims (3)

[Claims] 1. A method of heating a plurality of plate-like bodies continuously conveyed at predetermined intervals by a conveying means to a temperature equal to or higher than the melting point of a resin film, and bringing the plate-like bodies into a pair of upper and lower pressure roll nips. After sequentially inserting and clamping, after winding the resin film fed from the film supply means around the pressure roll, the upper and lower pressure rolls are adhered to one surface of the plate by passing between the lower rolls, and then In a resin film adhering method in which the resin film is cut at a position corresponding to a rear end of the plate-like body, the resin film is adhered to one surface of the plate-like body over its entire length and cut, and then: Before adhering the resin film to one surface of the plate-like body conveyed to, the pressure roll is rotated in the opposite direction by a predetermined angle, and the cutting end of the resin film is pulled back by a certain amount. Upper, while interlocking with the insertion of the plate-like body into the nip of the lower pressure roll, the upper, lower pressure roll is rotated in the forward direction to match the cutting tip of the resin film with the tip of the plate-like body, A resin film adhering method, wherein the resin film is adhered to one surface of the plate-like body over the entire length. 2. A method of heating a plurality of cylindrical bodies continuously conveyed at predetermined intervals by a conveying means at a temperature equal to or higher than a melting point of a resin film, and bringing the cylindrical bodies into a pair of nips of an outer pressure roll. After successively inserting and clamping, after winding the resin film fed from the film supply means around the inner pressure roll, the inner and the inner pressure of the tubular body are passed by passing between the outer pressure rolls, Thereafter, in the resin film attaching method in which the resin film is cut at a position corresponding to the rear end of the tubular body, after cutting and sticking the resin film over the entire length of the inner surface of the tubular body, Next, before attaching the resin film to the inner surface of the cylindrical body to be conveyed, the inner and outer pressure rolls are rotated in the opposite directions by a predetermined angle, and the cutting end of the resin film is pulled back by a certain amount. Then, in conjunction with the insertion of the tubular body into the nip of the inner and outer press rolls, the inner and outer press rolls are rotated in the forward direction to match the cutting end of the resin film with the tip of the tubular body. The method of attaching a resin film, wherein the resin film is attached to the inner surface of the tubular body over the entire length thereof. 3. A first conveying means in which a can body formed by rounding and / or bending a metal plate into a cylindrical shape and seam-welding the end thereof is provided in a direction perpendicular to the welding direction of the welding seam portion. The welding seam portion is heated to a temperature equal to or higher than the melting point of the correction resin film by using a pre-heating means provided in the middle of the first conveying means, and then the can body is moved to the first position. 1) the inner surface of the can body heated by the correction resin film supply unit while the correction resin film is heated by the second conveyance unit provided so as to convey the correction resin film in the direction perpendicular to the conveyance direction of the conveyance unit. The correction resin film is continuously supplied to and abutted on the welding seam portion on the side, and is pressed by an external pressure roll between a pair of inner and outer welding seam portions of the can body. A film sticking step for sticking on the seam portion; 2) Then, after the rear end of the welding seam portion has passed through the inner and outer press rolls, a film cutting step of cutting the resin film for correction by stopping rotation of the inner and outer press rolls while transporting the can body. 3) Next, a reheating step of reheating the welding seam portion of the can body to a temperature near the melting point of the correction resin film by using a post-heating means. 4) Then, inside and outside of the welding seam portion of the can body. A re-pressurizing step of re-pressing with a pair of re-pressing rolls arranged in (5), and 5) then performing a can body returning step of returning the corrected can body to the first transport means. Furthermore, after attaching and cutting the resin film over the entire length of the welding seam portion provided on the inner surface of the can body, before attaching the resin film to the welding seam portion of the can body to be conveyed next. The inner and outer pressure rolls are reversed by a predetermined angle. Rotate in the direction, pull back the cutting end of the resin film by a certain amount,
Thereafter, in conjunction with the insertion of the can body into the nip of the inner and outer press rolls, the inner and outer press rolls are rotated in the forward direction to make the cutting end of the resin film coincide with the end of the can body. A method for correcting a weld seam portion of the welding can, wherein the resin film is adhered to the inner surface of the can body over the entire length.