JPS6320471B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for thermally adhering tape pieces, and more specifically, for thermally adhering a tape piece made of thermoplastic or the like to the outer peripheral surface of an open end of a hollow cylindrical body such as a can body. Regarding equipment.

The open ends 2a and 3a of a seamless upper can body 2 and a seamless lower can body 3, as shown in FIG. Metal can 1 with peripheral joint 5
However, it has been proposed that it is particularly suitable for pressure-resistant containers for storing carbonated drinks, beer, etc. In this case, the method of forming the adhesive layer 4 includes applying a liquid adhesive such as a thermosetting adhesive or a slurry adhesive;
Alternatively, electrostatic coating of powder adhesive can be considered, but the method of coating and heating a tape-shaped film made of thermoadhesive plastic produces a stable adhesive layer with a uniform thickness and no defects such as pores. It is preferable because it can be obtained by

An object of the present invention is to provide an apparatus for automatically thermally bonding a tape piece made of such a heat-adhesive plastic film to the outer peripheral surface of the open end of a hollow cylindrical body such as a can.

To achieve the above object, the present invention provides a tape piece supply roll device, an adhesive roll device, and an adhesive roll device for thermally bonding tape pieces by surrounding the outer peripheral surface of the open end of a hollow cylindrical body. A thermal bonding device for tape pieces, comprising a hollow cylindrical conveying device that conveys a tape piece to a position opposite to a roll device and holds it at that position during thermal bonding, the hollow cylindrical body conveying device comprising a rotating shaft and a hollow cylinder conveying device that A support mainly consisting of a fixed first rotating disk and a second rotating disk, a holder for holding the vicinity of the bottom of the hollow cylindrical body, which is pivotally supported by the first rotating disk, and a second rotating disk. a mandrel opposite the holder, which is insertable into the open end, and which is supported by a mandrel; and a drive device fixed to the support for synchronously rotating the holder and the mandrel so that the open end rotates at a predetermined circumferential speed v during thermal bonding. , the tape piece supply roll device includes a vacuum suction hole for sucking and holding the tape fed out from the tape feeding device and wound around the circumferential surface, and a vacuum suction hole for sucking and holding the tape fed out from the tape feeding device and wound around the circumferential surface, and a vacuum suction hole for sucking and holding the tape fed out from the tape feeding device and wound around the circumferential surface, and a cutter for cutting a piece of tape having a length substantially equal to the outer circumference; the adhesive roll device cooperates with the mandrel to thermally bond the piece of tape to the outer circumferential surface of the open end; a thermal bonding portion having a circumferential surface having a circumferential speed of v and a circumferential length substantially equal to that of the tape piece, and a bonding roll having a small diameter portion having a smaller radius than the thermal bonding surface. Ori,
Thermal adhesion of tape pieces, wherein the thermal adhesion surface is made of heat-resistant elastic rubber and has vacuum suction holes for adsorbing and holding the tape pieces supplied from the tape piece supply roll device. It provides equipment.

The present invention will be described below with reference to the drawings which are examples.

In FIG. 2, 11 is a reel for sending out the tape 10, 12 is a looper, 13 is a pinch roll,
14 is a tape piece supply roll device, 15 is an adhesive roll device, and 16 is a conveyance device for the can body 17 (corresponding to the lower can body 3 in FIG. 1). The tape 10 is passed through a looper 12 from a feeding reel 11, and then transferred to a tape piece supply roll device 14 by a pinch roll 13.
The roll 18 is wound by vacuum suction around a hollow roll 18, and the roll 18 is configured to rotate in the direction of the arrow at a constant circumferential speed v and stop intermittently by a drive mechanism (not shown). Correspondingly, there is a drive mechanism (not shown) that intermittently rotates the pinch roll 13 in the direction of the arrow at a circumferential speed v, and a control drive mechanism that rotates the delivery reel 11 at controlled speeds so as to send out the tape at a linear speed v. (not shown) is provided.

When the tape 10 is made of a narrow (for example 4 to 10 mm) and thin (for example 30 to 150 μm) thermoplastic plastic film, as in the case where the adhesive layer 4 in FIG. 1 is formed, the tape 10 has a tension. When the tape piece 10a is wound around the roll 18 in the applied state, the tape piece 10a elastically contracts after being cut as described below.
There is a possibility that the tape piece 10a of the predetermined length cannot be obtained. The looper 12 is a pinch roll 13
This is provided in order to prevent a particularly large tension from being suddenly applied between the feeding reels 11 and the tape 10, which would have such an adverse effect. 12a ₁ , 12a ₂ , 12a ₃ are fixed position guide rolls. 12b ₁ and 12b ₂ are vertically movable guide rolls rotatably mounted on a movable support 12c that is vertically slidable along a fixed vertical shaft 12d. When a large tension is applied to the tape 10 due to a time lag in the control mechanism when starting or stopping the pinch roll 13 and the feed reel 11, the guide rolls 12b ₁ , 12
b ₂ is raised and the tension is relaxed. Note that 19 is a proximity switch that issues a signal to stop the rotation of the delivery reel 11 when the movable support 12c reaches the opposing position (lower limit position).

The tape piece supply roll device 14 includes a hollow roll 18 (for example, made of metal such as aluminum),
and a fixed cylinder 20 provided within the hollow part of the roll 18. Roll 18 and fixed tube 20
The structure is almost the same as that of the adhesive roll 21 and fixed tube 22 of the adhesive roll device 15, which will be described later, except for the difference in shape. That is, the roll 18 has a large number of vacuum suction holes 23 extending radially along the entire circumference.
The tape 10 supplied onto the circumferential surface of the roll 18 by the pinch roll 13 is attracted and wound onto the circumferential surface by negative pressure. As shown in FIG. 3, a shallow groove 24, which is approximately equal in width to the tape 10, is formed on the circumferential surface of the roll 18 and extends along the entire length in the circumferential direction.
3, the tape 10 is fed into the groove 24, thereby preventing the tape 10 from shifting laterally on the circumferential surface of the roll 18. In order to prevent the tape 10 from slipping, it is preferable that the bottom surface 24a of the groove 24 be made of a non-slip surface such as a thin rubber lining surface.

A vacuum chamber 25 and an air chamber 26 are formed between the inner surface of the roll 18 and the outer surface of the fixed tube 20, and both of them are connected to a first protrusion 27a and a second protrusion 27b formed on the fixed tube 20. isolated by. The circumferential surfaces of the protrusions 27a and 27b are formed to be able to slide airtightly on the inner circumferential surface of the roll 18.
The first protrusion 27a is attached to the adhesive roll device 15.
The vacuum chamber side surface _27a1 is located on the vacuum chamber 25 side in close proximity to a virtual plane passing through both the axes of the roll 18 and the adhesive roll 21, and the air chamber side surface 27a1 is located opposite to the vacuum chamber 25 side.
a ₂ is formed close to the virtual plane on the air chamber 26 side, so that the tape piece 10a can be smoothly moved from the roll 18 to the adhesive roll 21.

Further, the second protrusion 27b is connected to the pinch roll 13.
The vacuum chamber side surface _27b1 is formed to be located on the air chamber 26 side from an imaginary plane passing through both the axes of the roll 18 and the pinch roll 13, and the tape 10 is positioned opposite to the pinch roll 13 and the roll. After passing through the gap 18, it is immediately vacuum-adsorbed into the groove 24. The vacuum chamber 25 communicates with a center hole 28 of the fixed tube 20 via a guide hole 29, and the center hole 28 communicates with a vacuum device (not shown).

Reference numeral 30 is a cutter device provided at a fixed position, and the width of the cutting edge portion 31a is approximately equal to the width of the tape 10 (if the width of the groove 34 described later is formed longer than the width of the groove 24, the cutting edge portion 31a is approximately equal to the width of the tape 10). 31a may be larger than the width of the tape 10), and the cutter 3 is tapered in the width direction of the tape 10.
1. A holding body 32 of the cutter 31 is provided, and a cushion member 33 made of elastic rubber or the like is attached to the cutting edge portion 31a side of the holding body 32, and is configured to be able to reciprocate in the radial direction by a drive mechanism (not shown). There is. On the other hand, grooves 34 are formed on the bottom surface 24a of the groove 24 at predetermined circumferential intervals, and the circumferential length of the cushion member 33 is set to be larger than the circumferential length of the grooves 34. The drive mechanism is controlled so that when the groove 34 is in a position facing the cutter device 30, the roll 18 stops and at the same time the cutter device 30 is urged radially inward. At that time, the portions of the tape 10 above the grooves 24 on both sides of the grooves 34 are covered with cushion members 33.
The cutting edge portion 31a is pressed and fixed by
cuts the tape piece 10 and enters the groove 34. Therefore, cutting is performed smoothly. The circumferential distance between the grooves 34 (the circumferential length in the direction of the arrow from the lower groove 34 to the upper groove 34) is determined by the length of the tape piece 10a formed by cutting the open end 17a of the can body 17 ( (see FIG. 5).

Substantially equal in this case means tape strip 10
This includes the case where a is approximately 1 to 3 mm longer than the outer circumferential length of the open end 17a.

As shown in FIG. 4, the fixed cylinder 22 of the adhesive roll device 15 is provided at the tip of a hollow fixed shaft 35, and slides airtightly along the bushing part 36 of the fixed cylinder 22 to secure the adhesive roll. 21 is the fixed cylinder 22
Coaxially with this, the motor 37 continuously rotates the heat bonding surface 44a in the direction of the arrow (FIG. 2) through the gear device 38 so that the circumferential speed of the heat bonding surface 44a becomes a predetermined value v. A vacuum chamber 40 and an air chamber 41 are formed in the gap between the inner surface of the adhesive roll 21 and the outer surface of the fixed tube 22 by the first protrusion 39a and the second protrusion 39b formed on the fixed tube 22. The vacuum chamber 40 includes a guide hole 42 provided in the fixed cylinder 22 and a center hole 43.
It communicates with a vacuum device (not shown) through the hollow fixed shaft 35 (which passes through the inside of the hollow fixed shaft 35).

The adhesive roll 21 has a circumferential length of tape piece 10.
The heat bonding portion 44 has a heat bonding surface 44a having a length substantially equal to the length a, and a small diameter portion 45 having a smaller radius than the heat bonding portion 44. The thermal adhesive surface 44a is
As shown in FIG. 4, a heat-resistant elastic rubber ( (e.g. silicone rubber)
It is formed by layer 44b. Thermal bonding part 44
A large number of vacuum suction holes 46 extending in the radial direction and communicating with the vacuum chamber 40 are formed in the vacuum suction holes 4.
6 is open to the thermal bonding surface 44a. Note that when the thermal bonding portion 44 faces the roll 18, the heat-resistant elastic rubber layer 44b enters the groove 24 of the roll 18, and the thermal bonding surface 44a and the bottom surface 2 of the groove 24
The tape piece supply roll device 14 and the adhesive roll device 15 are arranged so that the gap between the tape pieces 10a is approximately equal to the thickness of the tape piece 10a.

As shown in FIGS. 2 and 5, the conveyance device 16 includes a rotating shaft 48, a rotating disk 49 fixed to the rotating shaft 48, and a rotating plate 53, which mainly form a support body. Ru. The holder 50 of the can body 17 includes a holder body 50a formed with a recess _50a1 having a shape into which a portion near the bottom of the can body 17 can be fitted, and a holder body 50a that is coaxial with the fitted can body 17. The shaft 50b is fixed to the shaft 50b. The holder 50 is a rotary disk 49
A plurality of shafts (four in the figure) are provided at equal intervals along the circumferential direction of the rotary disk 4.
It is supported so as to be slidable in the axial direction within through holes 51 (in the figure, four holes are provided at equal intervals along the circumferential direction) formed in the hole 9 . 52 is a solenoid (which may be a fluid cylinder) fixed to the rotating shaft 48, and the shaft 52a of the solenoid 52
The rear end of the shaft 50b of the holder is rotatably engaged with a joint 52b provided at the tip of the holder.

A rotating plate 53 is fixed to the rotating shaft 48 at a position opposite to the rotating disk 49 with respect to the holder 50 . Mandrels 54 (four in the figure) are pivotally supported on the rotating plate 53 at positions facing the holder 50. Surrounding the core 54a (for example, made of metal such as aluminum) of the mandrel 54,
A cushion layer 54b made of relatively thin (usually 1 to 10 mm thick) heat-resistant elastic rubber (Shore A hardness 50 to 100) is provided on the outer periphery of the can body 17 to be fitted into the open end 17a. ing. The cushion layer 54b cooperates with the heat-resistant elastic rubber layer 44b of the adhesive roll device 15 during thermal bonding of the tape pieces 10a to ensure uniform thermal bonding without defects such as wrinkles or unbonded areas. . Cushion layer 54b
If it is made of relatively thick and soft rubber,
This is not preferable since the open end portion is likely to be deformed by pressure during thermal bonding, resulting in the above-mentioned defects. Note that the core portion 54
A protrusion 54a ₁ is formed to engage with the end 17a ₁ of the open end 17a, so that the can body 17 can be positioned in the axial direction.

A motor 55 is fixed to the rotating shaft 48 corresponding to each holder 50, and the holder 50 and mandrel 54, which cooperate to hold the can body 17, are driven by the motor 55 to drive gears 56a, 56b and gears 57a, 57b, respectively. It is configured to be rotated synchronously through the

Open end 17a facing each mandrel 54
An arc-shaped high-frequency induction heating coil (hereinafter referred to as heating coil) 58 is fixed to the rotating plate 53 by a support (not shown). Connect to high frequency oscillator.

In FIG. 2, A is a charging station for the can body 17, B is a thermal bonding station, and C is a delivery station. The rotating shaft 48 is rotated for a predetermined period of time when the holder 50 reaches each station (the time during which the can body 17 is being thermally bonded, that is, the thermal bonding surface 44a of the bonding roll device 15 has passed through the thermal bonding station B). (time) and rotates while the small diameter portion 45 passes the thermal bonding station B, and moves in the direction of the arrow at such a speed that the next can body 17 reaches the thermal bonding station B at the moment the passage is completed. It is configured to rotate intermittently by a drive device (not shown). Note that in the thermal bonding station B, the thermal bonding surface 44a and the open end 17a face each other, and the gap therebetween is slightly smaller than the thickness of the tape piece 10a (so that pressing force is applied during thermal bonding). ), the mandrel 54 is arranged.

Installation of the can body 17 at the charging station A,
The transmission at the transmission station C is performed as follows. When the holder 50 reaches the delivery station C and stops, the solenoid 52 is actuated by a signal from a limit switch (not shown), and the holder 50 is retracted to the position shown by the dashed line in FIG. Next, the can body 17 is gripped by a feeding grip (corresponding to the feeding grip 59 in FIG. 5), and the can body 17 is moved toward the turntable 49 and removed from the mandrel 54. Send it to the process. The holder 50 remains in this position until it reaches the charging station A. When the holder 50 reaches the charging station A, the can body 17 (indicated by a dashed line) held by the feeding grip 59 descends, and the can body 17 and the holder 50 become coaxial. , the solenoid 52 is operated by a signal from a limit switch (not shown), and the holder 50 moves to the right in the figure, and the can body ₁ is inserted into the recess 50a1.
The vicinity of the bottom of 7 is inserted, and the end surface 1 of the open end 17a
7a ₁ engages with the protrusion 54a ₁ of the mandrel 54.

From charging station A to thermal bonding station B
While the can body 17 is being conveyed to
rotates in the direction of the arrow, during which time the heating coil 58 is energized, and the open end 17a is heated uniformly along the entire circumference to a temperature that allows thermal bonding (a temperature higher than the melting point or softening point of the thermoplastic resin constituting the tape piece 10a). is heated to. At this time, the vicinity of the protrusion _54a1 of the mandrel 54 is also heated, but this moderate heating is preferable from the viewpoint of preventing cooling of the open end 17a during thermal bonding.

If necessary, the heating coil 58 is energized during thermal bonding to prevent the unbonded portion of the open end 17a from dropping to a temperature lower than the temperature at which thermal bonding is possible.
After the thermal bonding is completed, the heating coil 58 is deenergized until the next can body 17 is loaded at the loading station A and its rotation is started.

With the above device, the open end 17a of the can body 17
Thermal adhesion of the tape piece 10a to the outer circumferential surface of is carried out as follows.

thermobonded plastics, such as modified linear polyester, or nylon 12 or nylon 11;
A tape 10 of a predetermined width and thickness made of a thermoplastic film having a relatively low melting point and a polar group, such as acid-modified polyolefin, is passed from a feeding reel 11 through a looper 12 and a pinch roll 13 into tape pieces. It enters the groove 24 of the supply roll device 14 and the bottom surface 24a of the groove 24.
The groove 34 is wound around the cutter 3 by vacuum suction and moves in the direction of the arrow as the roll 18 rotates.
1, the roll 18 is stopped and the tape 10 is cut. This stop is caused by the small diameter portion 45 of the adhesive roll 21 continuously rotating in the direction of the arrow.
This continues while the roll 18 passes through the position X facing the adhesive roll 21 (the position of the groove 34 located above). Tip 44 of thermally bonded portion 44 of adhesive roll 21
When m reaches the opposing portion, the roll 18 rotates in the direction of the arrow at the same circumferential speed v as the thermal bonding surface 44a, and the vacuum suction hole 23 that suctions the tip of the tape piece 10a on the roll 18 closes in the air chamber. Since the vacuum is released by communicating with 26, the tip part is connected to the thermal bonding part 4.
The tape piece 10a is suctioned by the vacuum suction hole 46 of No. 4, and smoothly transfers from the roll 18 to the thermal bonding surface 44a. This transition occurs in the groove 3 located below.
4 reaches the opposing position, at which point the roll 18 stops.

Since the length of the tape piece 10a is substantially equal to the length of the thermal adhesive surface 44a, the tape piece 10a is attracted over substantially the entire length of the thermal adhesive surface 44a. When the vicinity of the tip 44m of the thermal bonding surface 44a is not covered with the tape piece 10a, the vicinity comes into contact with the heated open end 17a, and the contacting portion of the open end 17a is heated to a temperature that allows thermal bonding. Although there is a risk that cooling to a lower temperature may result in defective thermal adhesion, in the case of this embodiment, such troubles are prevented.

Next, at the thermal bonding station B, the tape piece 10a is released from adsorption by the vacuum suction hole 46, rotates from the thermal bonding surface 44a in the direction of the arrow at a circumferential speed v, and attaches to the can body heated to a temperature that allows thermal bonding. Along the entire length of the outer circumferential surface of the open end 17a of No. 17, the heat-resistant elastic rubber layer 44b and the cushion layer 54b of the mandrel 54 work together under pressure, as shown in 10a shown by the dashed-dotted line in FIG. , thermally bonded. Can body 1 delivered from delivery station C
7 is an open end 17a of the tape piece 10a in the next step.
It has a structure in which the outwardly extending portion 10a ₁ is folded inward to protect the end surface 17a ₁ and the portion 10a ₁ is thermally bonded to the inner surface of the open end 17a.
It is formed in the lower can body 3 shown in FIG.

The present invention is not limited to the above embodiments. For example, the roll 18 continuously rotates in the direction of the arrow at a circumferential speed v, and the tape 10 is supplied to the roll 18 at a predetermined speed lower than the speed v. Tape 10 on the surface on the entrance side from the position facing the cutter 31
may be slipped to provide a gap between the leading tape strip and the trailing tape strip (not shown) on the surface of the roll 18 with a circumferential length corresponding to the small diameter portion 45 of the adhesive roll. Further, as a heating device for the opening end, a hot air heating device, an infrared heater, etc. may be used. Further, the roll diameter of the adhesive roll device may be increased and a plurality of thermally bonded portions may be provided in the device.

According to the apparatus of the present invention, tape pieces can be thermally bonded automatically and stably by surrounding the outer peripheral surface of the open end of a hollow cylindrical body without causing defects such as wrinkles or unbonded areas. It has the effect of being able to.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a metal can assembled as a lower can body using an example of a hollow cylindrical body with a tape piece thermally bonded to the open end by the apparatus of the present invention, and FIG. 2 is an embodiment of the present invention. A partially cutaway front view of the example device, FIG. 3 is a cross-sectional view taken along the line - in FIG. 2, FIG. 4 is a longitudinal sectional view taken along the line - in FIG. 2, and FIG. FIG. DESCRIPTION OF SYMBOLS 10... Tape, 10a... Tape piece, 14... Tape piece supply roll device, 15... Adhesive roll device, 1
6... (hollow cylindrical body) conveying device, 17... can body (hollow cylindrical body), 17a... open end, adhesive roll... 21,
23... Vacuum suction hole, 30... Cutter device, 44...
Heat bonding part, 44a... Heat bonding surface (peripheral surface), 45... Small diameter part, 46... Vacuum suction hole, 48... Rotating shaft, 49...
(first) rotating disk, 50... holder, 53... rotating plate (second rotating disk), 54... mandrel, 55...
Motor, 58...High frequency induction heating coil.

Claims (1)

[Claims] 1. A tape piece supply roll device, an adhesive roll device, and a tape piece supply roll device for thermally bonding a tape piece by surrounding the outer peripheral surface of the open end of the hollow cylindrical body, and transporting the hollow cylindrical body to a position opposite to the adhesive roll device. , a tape piece thermal bonding device comprising a hollow cylindrical body conveying device for holding in the position during thermal bonding, the hollow cylindrical body conveying device comprising: a rotating shaft; a first rotary disk fixed to the rotating shaft; a support mainly consisting of a second rotary disk; a holder for holding the vicinity of the bottom of the hollow cylindrical body, which is rotatably supported by the first rotary disk; and the open end, which is rotatably supported by the second rotary disk. can be inserted into the
a mandrel facing the holder; a device fixedly attached to the support that heats the open end to a temperature that allows thermal bonding before reaching a position facing the adhesive roll device; and the open end during thermal bonding. The holder and the mandrel are provided with a driving device fixed to the support body for synchronously rotating the holder and the mandrel so that the tape piece supply roll device is fed out from the tape feeding device. A vacuum suction hole for sucking and holding the tape wound around the circumferential surface, and cutting a piece of tape having a length substantially equal to the outer circumference of the open end from the tip of the wound tape. The adhesive roll device has a circumferential speed of v and a circumferential length that serves as a thermal bonding surface for thermally bonding the tape piece to the outer peripheral surface of the open end in cooperation with the mandrel. is provided with a thermal bonding portion having a peripheral surface substantially equal to the circumferential surface of the tape piece, and an adhesive roll having a small diameter portion having a smaller radius than the thermal bonding surface, the thermal bonding surface being made of heat-resistant elastic rubber, and A thermal bonding device for tape pieces, characterized in that a vacuum suction hole for sucking and holding the tape pieces supplied from the tape piece supply roll device is opened.