JP5258391B2 - Coated tape cutting method and coated tape cutting device - Google Patents

Description

  The present invention relates to a covering tape dividing method capable of easily dividing an excess covering tape extending between a can body transferred at intervals and a can body transferred subsequently, at both ends of the can body. And a coated tape cutting device.

  Conventionally, welded cans that have been seam welded to surface-treated steel sheets such as plated steel sheets, tin-free steel, and resin-coated steel sheets have been widely distributed. In these welded cans, seam welded portions and end portions of joint portions are widely used. Since the bare metal is exposed, the plating layer, the surface treatment layer, and the coating resin layer near the weld are destroyed by the heat during welding. Although correction has been performed, a method of covering the inner surface of a can body by thermal fusion using a resin-made coating tape (correction tape) is widely performed from the viewpoint of recent environmental conservation.

The coating with such a covering tape is performed by abutting a seam welded portion of the inner surface of the can body with a covering tape composed of a long belt-like resin film on the weld seam portion of the weld can and using a pressure roll. The coated tape, which has been heat-bonded by pressure bonding, rapidly cools the pressure-bonded portion, and then tensions the excess coated tape with one end of the opening of the seam welded portion coated with the coated tape as a fulcrum. The method of attaching and dividing is taken (for example, refer patent document 1).
JP 2002-86229 A

  However, the heat-sealable resin-coated tape shown in Patent Document 1 has a heat shrinkability when it is heat-sealed to a seam welded portion on the inner surface of a can body that has been heated in advance. Since the surface is exposed or peeled off, the reliability of the coating is low. As a result, PET (PolyEthylene Terephthalate) “polyethylene terephthalate” has excellent mechanical properties such as heat sealability and dimensional stability, and excellent electrical properties, heat resistance, and chemical resistance as a more reliable coating tape. Coated tapes using “Rate” as a resin material have attracted attention.

  However, this type of coated tape cannot be cut unless the heating temperature of the can body is heated to about 220 ° C. or higher. On the other hand, if the heating temperature of the can body is heated to about 220 ° C. or higher, Since the coating or the film was damaged, it was difficult to heat the can and cut the covering tape.

  The present invention has been made in consideration of such circumstances, and can quickly and accurately sever a resin-coated tape that is coated on the inner surface of the can body and extends between the can bodies to be transferred. An object of the present invention is to provide a covering tape cutting method and a covering tape cutting device that can be used.

In order to solve the above problems, the present invention proposes the following means.
The invention described in claim 1 covers the inner surface of the can body from one end portion to the other end portion of the can body having both ends opened, and when the can body is transported by the transport means. A covering tape dividing method for dividing a resin-coated tape extending between a can body to be transported in advance and a can body to be transported subsequently, while transporting the can body, the can body being transported in advance The rear end portion of the covering tape is detected, and a portion exposed from the rear end portion of the covering tape is irradiated with a laser beam synthesized with the transfer speed of the can body along the rear end portion, and the can body is subsequently transferred A front end portion of the covering tape is detected, and a portion of the covering tape exposed from the front end portion is irradiated with a laser beam synthesized with a transfer speed of the can body along the front end portion to divide the covering tape from the can body. It is characterized by.

The invention described in claim 3 covers the inner surface of the can body from one end portion of the can body whose both ends are open toward the other end portion, and when the can body is transferred by the transfer means. A covering tape cutting device for cutting a resin-coated tape extending between a can body to be transported in advance and a can body to be transported subsequently, while transporting the can body, the can body being transported in advance And a transfer means for transferring the can body to be subsequently transferred at intervals, and a can end detection means for detecting a rear end portion of the preceding can body and a front end portion of the can body to be subsequently transferred And a laser irradiation device capable of irradiating a laser beam combined with the transfer speed of the can body along the rear end portion and the front end portion, and the laser beam is applied to the rear end portion of the covering tape. And is configured to irradiate a portion exposed from the front end portion. And said that you are.

According to the method and apparatus for cutting a coated tape according to the present invention, the coated tape is exposed from the rear end portion of the can body that is transported in advance and the front end portion of the can body that is transported subsequently and extends between the can bodies. In addition, the coated tape is divided by irradiating the rear end portion and the front end portion of the can body with a laser beam synthesized with the transfer speed of the can body. As a result, the excess covering tape extended from the end of the can body can be cut at high speed and accurately.
In addition, since the influence of the heat shrinkage on the covering tape in which the heat shrinkage occurs is suppressed, it is possible to easily divide the end portion of the can body.

  A second aspect of the present invention is the covering tape dividing method according to the first aspect, wherein a portion of the covering tape that extends between the preceding transported can body and the subsequent transported can body is pulled. It is characterized by doing.

  The invention described in claim 4 is the covering tape cutting apparatus according to claim 3, wherein the transfer means includes a first drive unit corresponding to the can body to be transferred in advance and the can to be transferred subsequently. A second driving unit corresponding to the body, wherein the first driving unit is set at a relatively higher speed than the second driving unit, and the can body that is transported in advance and the can body that is transported in the subsequent direction It is configured to pull the covering tape extending in between.

  According to the cutting method and the cutting apparatus for the covering tape according to the present invention, the excess covering tape extending between the can body to be transported in advance and the can body to be transported subsequently is pulled, so that the deflection of the covering tape is reduced. Occurrence is suppressed and the laser beam is easily formed at a location where the focal point of the laser beam is divided, and the tensile force facilitates the division of the covering tape. As a result, the coated tape can be cut accurately and in a short time.

According to the covering tape cutting method and the covering tape cutting device according to the present invention, the excess covering tape extending from the end of the can can be cut at high speed and accurately, so that the processing speed for cutting the covering tape is increased. Can be fast. As a result, the productivity of the operation of covering the can with the covering tape can be improved.
In addition, it is possible to easily cut the end portion of the can body by suppressing the influence of the heat shrinkage on the covering tape in which the heat shrinkage occurs.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a schematic configuration of a can body covering tape cutting device 10 according to an embodiment of the present invention, and reference numeral 1 denotes a can body.

  The covering tape dividing device 10 detects a transfer device (transfer means) 11 for transferring the can body 1, a rear end portion E1 of the can body 1 that is transferred in advance, and a front end portion E2 of the can body 1 that is transferred subsequently. A fiber sensor (can end detecting means) 12 and a laser irradiation device LA that can be irradiated while moving a laser beam combined with the transfer speed of the can 1 in the width direction of the covering tape 3. The coating tape 3 exposed to the rear end portion E1 and the front end portion E2 of the transferred can body 1 is irradiated with a laser beam to divide the coating tape 3.

In the present embodiment, the can body 1 is, for example, a rectangular tube having both ends used for a 18 liter square 18 liter can, and the two opposite sides of the steel plates are butted together and joined by seam welding. Yes, it is molded in the molding apparatus P.
In addition, the shape of the can 1 may be a cylinder or a polygonal column like a pail can, and the material may be aluminum or resin.

In the present embodiment, the covering tape 3 is made of PET, which is a thermoplastic resin, in the form of a transparent film.
The covering tape 3 may be made of resin such as polypropylene (PP) or polyethylene (PE) in addition to colored film PET instead of transparent film PET.
In that case, the coated tape 3 using polypropylene resin is preferably, for example, 18 mm wide and 100 μm thick, and the covering tape 3 using polyethylene resin is preferably 18 mm wide and 120 μm thick.

  The can body 1 is formed into a rectangular tube shape whose both ends are opened by the molding device P, and then is spaced at a predetermined interval by the transfer device 11 at a predetermined conveying speed in the axial direction of the can body 1 (the axial direction of the rectangular tube). It is to be transferred.

  The transfer device 11 includes a first transfer device 11A arranged on the front side in the transfer direction of the can body 1 and a second transfer device 11B arranged on the rear side in the transfer direction. The first transfer device 11A and the second transfer device A laser irradiation device LA is provided below the device 11B while being arranged at a predetermined interval.

  11 A of 1st transfer apparatuses are comprised by 1st support roller R1A and 2nd support roller R1B which were arrange | positioned at the up-down direction with the surrounding surface facing the transfer direction back side of the can 1 of the 1st transfer apparatus 11A. The first support roller R1A and the second support roller R1B are urged in a direction approaching each other by a biasing member (not shown) (for example, a spring). The roller R1A supports the inner surface of the side wall of the passing can body 1 and the pressing roller R1B supports the outer surface of the side wall of the can body 1 and assists the conveyance of the can body 1.

Further, the first transfer device 11A includes a first drive unit 16, and the first drive unit 16 controls the speed at which the first support roller R1A and the second support roller R1B rotate with the can body 1 interposed therebetween. Thus, the can 1 can be transferred at a predetermined transfer speed.
Below the support roller R1, there are disposed an excess covering tape 3B after being divided and a nozzle N for sucking dust generated when the dividing is performed.

  The second transfer device 11B includes a first pressing roller R2A and a second pressing roller R2B that are arranged in the vertical direction with the circumferential surface facing the front side in the transfer direction of the can 1 of the second transfer device 11B. The first pressure roller R2A and the second pressure roller R2B are urged in directions close to each other by a urging member (not shown), and the first pressure roller R2A passes through the can. The coating tape 3 is pressed against the inner surface of the side wall of the body 1 and the second pressing roller R2B presses the outer surface of the side wall of the can body 1 so that the coating tape 3 is heat-melted at the seam of the weld that has risen to a predetermined temperature by seam welding It is designed to be covered by wearing.

Further, the second transfer device 11B includes a first drive unit 18, and the first drive unit 18 controls the speed at which the first pressing roller R2A and the second pressing roller R2B rotate with the can body 1 interposed therebetween. Thus, the can 1 can be transferred at a predetermined transfer speed.
In addition, the conveyance speed of 11 A of 1st transfer apparatuses and the 2nd transfer apparatus 11B makes the 1st transfer apparatus 11A relatively higher than the 2nd transfer apparatus 11B, and the 2nd can body 1 transferred by 11 A of 1st transfer apparatuses. A tensile force is generated between the can 1 transferred by the transfer device 11B.

  The fiber sensor 12 irradiates the transferred can body 1 and the covering tape 3 with light (for example, laser light) transmitted through the transparent covering tape 3, and the rear end of the can body 1 is blocked by this light being blocked. The part E1 and the front end part E2 are configured to be detectable.

  The control unit 15 receives a detection signal from the fiber sensor 12 and can output a control signal to the first drive unit 16, the second drive unit 18, and the laser irradiation apparatus LA. Further, a control signal is sent out so that a coated tape supply device (not shown) can be driven at a speed corresponding to the second drive unit 18.

  The laser irradiation device LA is a carbon dioxide gas laser including a scanning mirror (for example, a galvanometer scanner) M that reflects an oscillated laser beam and changes the direction of its optical path, and a condenser lens (not shown). A so-called laser marking apparatus that forms a character, a symbol, or the like by irradiating a metal surface with a laser beam is applicable.

Note that the output of the laser irradiation device LA used when dividing the coated tape 3 varies depending on the type of the coated tape 3, but for example, the rated output is 30 W (continuous wave, pulse wave), the output is 90%, and the fundamental wave The wavelength of 1064 nm is preferred.
The laser irradiation device LA is not limited to a carbon dioxide laser, and other lasers such as a YAG laser can be used.

  As shown in FIG. 2, the scanning mirror M combines the transfer speed of the can 1 and the moving speed of the focal point of the irradiated laser beam in the width direction of the covering tape 3 based on the control signal from the control unit 15. It is possible. Note that the rear end E1 and the front end E2 of the can body 1 in FIG. 2 are formed orthogonal to the transfer direction of the can body 1.

  When the excess covering tape 3B exposed from the rear end E1 of the can body 1 is divided, the irradiated laser beam includes the transfer speed Vx of the can body 1 and the speed component Vy in the width direction of the excess covering tape 3B. A position corresponding to the rear end E1 of the can body 1 is irradiated from the starting point S1 along the rear end E1 at the side edge of the excess covering tape 3B.

When the excess covering tape 3B exposed from the front end portion E2 of the can body 1 is divided, the irradiated laser beam includes the transfer speed Vx of the can body 1 and the speed component Vz in the width direction of the excess covering tape 3B (normally Has a velocity vector Vb obtained by combining Vz = −Vy), and a position corresponding to the front end E2 of the can body 1 at the side edge of the excess covering tape 3B extends from the starting point S2 to the front end E2. Is irradiated.
The irradiated laser beam needs to have an output that divides the covering tape 3 while moving the covering tape 3 at the velocity vectors Va and Vb.

  Further, on the rear side in the transfer direction of the pressing roller R2, for example, a covering tape supply device (not shown) having the covering tape 3 wound in a roll shape and feeding out the covering tape 3 is disposed. The covering tape 3 fed out from the covering tape supply device passes through a roller group 13 composed of a plurality of small-diameter rollers and is led out to the pressing roller R2. The pressing roller R2 covers the inner surface of the side wall portion of the can body 1 and then the can. The body 1 is pulled by the support roller R1.

Next, with reference to FIG. 3 to FIG. 6, the division of the excess covering tape 3 </ b> B covered with the can 1 and exposed from the rear end E <b> 1 and the front end E <b> 2 will be described.
<Coating start process>
First, as shown in FIG. 3, a can body 1 </ b> A that is molded into a rectangular tube shape and seam-welded on the side wall of the molding device P is unloaded from the molding device P, and the front end E <b> 2 on the front side in the transfer direction is the first Passes between the pressure roller R2A and the second pressure roller R2B.

The inner surface of the side wall portion of the can 1A is supplied with the covering tape 3 fed out from the covering tape supply device until the front end E2 reaches the first pressing roller R2A and the second pressing roller R2B. The covering tape 3 is pressed by the pressing roller R2, and the inner surface of the side wall portion of the can body 1A is covered by heat fusion.
When the front end portion E2 of the can body 1A is detected by the fiber sensor 12, the excess covering tape 3B exposed from the front end portion E2 of the can body 1A is irradiated with the laser beam, and the portion exposed from the front end portion E2 is divided and removed. The

<First step>
Next, as shown in FIG. 4, the can body 1B, which is formed into a rectangular tube shape and is seam welded to the side wall of the can body 1A following the can body 1A, is unloaded from the molding apparatus P, and the front end E2 of the can body 1B is The covering tape 3 that passes between the first pressing roller R2A and the second pressing roller R2B and is pressed by the pressing roller R2 is coated on the inner surface of the side wall of the can body 1A by thermal fusion.

In parallel with this, when the fiber sensor 12 detects the rear end E1 of the can body 1A, a laser beam is emitted from the laser irradiation device LA along the rear end E1, and exposed from the rear end E1 of the can body 1A. The excess covering tape 3B thus obtained is divided.
At this time, the surplus coating tape 3B is pulled toward the second transfer device 11B by making the first transfer device 11A relatively faster than the second transfer device 11B.
When the covering tape 3 is divided along the rear end E1 of the can body 1A, the excess covering tape 3B extending from the front end E2 of the can body 1B is in a cantilever state at the front end E2 of the can body 1B. However, it is sucked by the suction nozzle N to be in a tension state.

<Second step>
Next, when the excess covering tape 3B is divided along the rear end portion E1 of the can body 1A, the can body 1B is pulled and pulled to the suction nozzle N by the excessive covering tape 3B exposed from the front end portion E2. When the front end E2 is detected by the fiber sensor 12, as shown in FIG. 5, the side edge of the surplus coating tape 3B exposed from the front end E2 is irradiated with the laser beam to surplus. The covering tape 3B is divided along the front end E2 of the can 1B.

<First step (repeat)>
Next, as shown in FIG. 6, when the can body 1 </ b> B is covered with the covering tape 3, the can body 1 </ b> B moves to the first transfer device 11 </ b> A, and the can body 1 </ b> C is transported at regular intervals. Is done.
Since FIG. 6 is a repetition of the first step shown in FIG.

  Since the rear end E1 of the can body 1A and the front end E2 of the can body 1B are accurately detected by the fiber sensor 12, the surplus exposed from the rear end E1 of the can body 1A and the front end E2 of the can body 1B. The excess covering tape 3B can be accurately divided by forming a laser beam focus on the covering tape 3B and irradiating it.

  According to the covering tape cutting method and the covering tape cutting apparatus 10 according to the above embodiment, an excess of the laser beam having a velocity vector obtained by combining the transfer speed Vx of the can 1 and the moving speeds Vy and Vz of the covering tape 3 in the width direction is surplus. Therefore, the excess covering tape 3B exposed from the rear end E1 of the can body 1A and the rear end E1 of the can body 1B can be accurately divided.

  Further, by accurately forming the focal point of the laser beam on the covering tape 3, it is possible to suppress the output required for the division, and as a result, it is possible to suppress the occurrence of heat shrinkage that occurs in the covering tape 3. The reliability of the heat-sealing of the covering tape 3 to 1 can be improved.

  As a result, the inner surface of the can body 1 can be coated with the covering tape 3 and the processing capacity for cutting can be increased from the conventional 56 cans / minute to 70 cans / minute to improve productivity.

It is a figure showing the schematic structure of the covering tape cutting device concerning one embodiment of the present invention. It is a top view explaining the laser beam moving direction and speed irradiated at the time of cutting | disconnection of a covering tape. It is a figure explaining the covering start process of the covering tape cutting device concerning one embodiment of the present invention. It is a figure explaining the 1st process of the covering tape cutting device concerning one embodiment of the present invention. It is a figure explaining the 2nd process of the covering tape cutting device concerning one embodiment of the present invention. It is a figure showing the state where the 1st process of the covering tape cutting device concerning one embodiment of the present invention was repeated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Can body 1A Can body previously transferred 1B Can body subsequently transferred 3 Coating tape 3A Covered coating tape 3B Excess coating tape 10 Coating tape cutting device 11 Transfer device 15 Control device 16 1st drive part 18 2nd Drive unit LA Laser irradiation device R1 Support roller R2 Pressure roller

Claims (4)

The inner surface of the can body is covered from one end portion of the can body having both ends open toward the other end portion, and when the can body is transported by the transport means, the can body is transported in advance and subsequently transported. A covering tape dividing method of dividing a resin-coated tape extending between the can bodies while transferring the can body,
Detecting a rear end portion of the can body that is transported in advance, and irradiating a portion exposed from the rear end portion of the covering tape with a laser beam that combines the transfer speed of the can body along the rear end portion,
A front end portion of the can body that is subsequently transferred is detected, and a laser beam that combines the transfer speed of the can body is irradiated along the front end portion to a portion that is exposed from the front end portion of the covering tape. A method for dividing a coated tape, comprising: The covering tape dividing method according to claim 1,
A method for cutting a covering tape, wherein a portion of the covering tape extending between the can body to be transported in advance and the can body to be transported subsequently is pulled. The inner surface of the can body is covered from one end portion of the can body having both ends open toward the other end portion, and when the can body is transported by the transport means, the can body is transported in advance and subsequently transported. A covering tape cutting device for cutting a resin-coated tape extending between the can bodies while transferring the can body,
Transfer means for transferring the can body to be transported in advance and the can body to be transported in succession at intervals;
A can end detecting means for detecting a rear end portion of the can body to be transferred in advance and a front end portion of the can body to be transferred subsequently ;
A laser irradiation device capable of irradiating the laser beam combined with the transfer speed of the can body along the rear end portion and the front end portion, and
A covering tape cutting device configured to irradiate the laser beam to a portion exposed from the rear end portion and the front end portion of the covering tape. The covering tape cutting device according to claim 3,
The transfer means includes
A first drive unit corresponding to the can that is transported in advance;
A second drive unit corresponding to the can transferred subsequently, and
The first driving unit is set at a relatively higher speed than the second driving unit so as to pull the covering tape extending between the preceding transported can body and the subsequent transported can body. A coated tape cutting device characterized in that it is configured.

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