JPS6339034B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a device for pasting film pieces, and more particularly to a device for pasting film pieces to the outer peripheral surface of a cylindrical body such as a can body.

(Prior Art) Open ends 2a and 3a of a seamless upper can body 2 and a seamless lower can body 3, as shown in FIG. and a metal can 1 having a circumferential joint 5 bonded thereto.
However, it has been proposed that it is particularly suitable for pressure-resistant containers for storing carbonated drinks, beer, etc.

In this case, the adhesive layer 4 can be formed by applying a liquid adhesive such as a thermosetting adhesive or a slurry adhesive to the open end before fitting, or electrostatically applying a powder adhesive. However, a method of applying a tape-like film piece made of heat-adhesive plastic to the opening end 3a that should be inside and heating it is a method.
This is preferred because an adhesive layer with a uniform thickness and without defects such as pores can be stably obtained.

JP-A-58-152082 proposes a device for automatically thermally bonding a piece of tape 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 body. There is.

(Problems to be Solved by the Invention) Thermal bonding of tape pieces by this device is carried out in a state in which a hollow cylindrical body that intermittently revolves is held in a fixed position in a thermal bonding station. Therefore, there was a problem that there was a limit to the production speed, making it unsuitable for high-speed production.

(Object of the Invention) The present invention has been made in view of the problems of the prior art described above, and the object of the present invention is to move a piece of film made of heat-adhesive plastic or the like into a cylindrical body that continuously revolves. It is an object of the present invention to provide a device that adheres to an outer circumferential surface while continuing to revolve.

(Structure of the Invention) The present invention provides an apparatus for adhering a film piece on the circumferential surface of an adhering roll to the outer peripheral surface of a cylindrical body, the apparatus comprising: an adhering roll, which is continuous in the same flow direction as the adhering roll; a rotatable holder that holds the cylindrical body so that the axial center of the cylindrical body is parallel to the axial center of the application roll; A support body is attached to the holder and is engaged with a cam follower provided on the support body, and the outer circumferential surface of the cylindrical body is in contact with the pasting roll via the film piece. While the cylindrical body revolves, the locus of the axis of the cylindrical body is coaxial with the pasting roll, and its radius is equal to the radius of the outer peripheral surface of the pasting roll and the thickness of the film piece. a fixed cam for moving the support in the radial direction of the turret so that it becomes part of an imaginary cylindrical surface slightly smaller than the sum of the radius and the radius of the outer circumferential surface of the cylinder, and in the application station, In contact with the circumferential surface of the holder, the holder is moved in the same flow direction as the adhesive roll, and the circumferential speed of the outer circumferential surface of the cylindrical body is equal to or equal to the circumferential speed of the circumferential surface of the adhesive roll. The present invention provides a film piece sticking device characterized in that it is equipped with a drive roll coaxial with the sticking roll, which rotates the film piece so that the roll becomes slightly larger.

(Example) The present invention will be described below with reference to drawings which are examples.

FIGS. 2 and 3 show an apparatus 6 for thermally bonding, ie pasting, a tape-like film piece to the open end 3a of the lower can 3 of the type shown in FIG. The thermal bonding device 6 includes a web supply device (not shown) and a film piece supply device 8 (for example, a
58-89955), a thermal adhesive roll device 9, and a can transport device 10.

The thermal adhesive roll device 9 includes a fixed shaft 18 and a roll 19 that continuously rotates around the fixed shaft in the direction of arrow Y. The roll 19 includes an inner cylinder 20 made of metal. The outer circumferential surface of the inner cylinder 20 is provided with a heat-resistant material at a position opposite to the open end 3a of the can body 3 and at a position opposite to the contact circumferential surface 31b of the base 31b of the open end holder 31, as will be described later. A sticking outer cylinder 21 made of elastic rubber (for example, silicone rubber) and a driving outer cylinder 29 made of elastic rubber are provided (FIG. 3). In this specification, the outer cylinder 21 is referred to as a pasting roll, and the outer cylinder 29 is referred to as a drive roll.

The pasting roll 21 has a thermally bonded portion 21a whose outer circumferential surface length is substantially equal to the length of the film piece 11 and whose spacing along the circumference is substantially equal to l, and a thermally bonded portion 21a whose diameter is smaller than the thermally bonded portion 21a. Each small thermal bonding part 21a
It has a small diameter portion 21b located between. The roll 19 is disposed such that the outer circumferential surface of the thermally bonded portion 21a passes through a delivery station A where the film piece 11 is delivered from the film piece supply device 8. In this specification, the outer circumferential surface of the thermally bonded portion 21a is referred to as the circumferential surface of the adhesive roll. roll 19
is continuously rotated in the direction of arrow Y at a constant speed by a drive mechanism (not shown) via a drive shaft 21c.

A vacuum chamber is provided between the roll 19 and the fixed shaft 18 in a portion corresponding to the path from the delivery station A to the thermal bonding station B, which is located at a position substantially opposite to the delivery station A along the direction of arrow Y, that is, to the bonding station. 22 is formed, and the vacuum chamber 22 communicates with a vacuum device (not shown) through a guide hole 23 and a center hole 24 of the fixed shaft 18. A large number of vacuum holes 25 are formed in the thermal bonding section 21a and extend in the radial direction to the vacuum chamber 22, and the film piece 11 sent out to the roll 19 at the sending station A is vacuumed on the outer peripheral surface of the thermal bonding section 21a. It is configured to be adsorbed and held until thermal adhesion, that is, adhesion, is completed.

The can transport device 10 includes a can transport turret 26 that continuously rotates in the direction of arrow Z, a can transport turret 27 that continuously rotates in the direction of arrow W, that is, in the same flow direction as the rolls 19, and revolves the cans 3. arrow V
A can delivery turret 28 and a can holder device 30 are provided.

The can transport turret 27 is rotated by a drive mechanism (not shown) via a central shaft 27a. The turret 27 is provided with a number (sixteen in the figure) of elongated support portions 36 along its periphery extending in the direction of the central axis 27a. Corresponding to each support part 36,
A can holder device 30 is provided. The can holder device 30 includes an opening holder 31, a bottom holder 41 coaxial with the opening holder 31, and a support 32 for each of the holders 31, 41.

The opening holder 31 has an insertion portion 3 that can be inserted almost snugly into the opening end 3a of the can body at room temperature.
1a, it has a base 31b connected to the insertion part 31a via a stepped part 31d, and the base 31b has a contact peripheral surface having an outer diameter that is approximately equal to or slightly smaller than the outer diameter of the open end 3a. 31b ₁ is formed, and when the contact peripheral surface 31b ₁ contacts the drive roll 29, the holder 31 is configured to rotate. Further, the holder 31 is pivotally supported by a corresponding support body 32 by a shaft 31c.

The bottom holder 41 has a recess into which the bottom of the can body 3 can be inserted almost snugly, and is pivotally supported by a corresponding support 32 by a shaft 41c. A vacuum hole 41a extending in the axial direction and connected to a vacuum device (not shown) is formed in the shaft 41c, and a cam follower 45 is attached to engage with a cam (not shown) to move the bottom holder 41 in the axial direction. It is set up. shaft 31c
and 41c, each gear 42 is fixed, and the bottom holder 41 is configured to rotate at the same rotational speed as the opening holder 31 via a gear 43 and a link rod 44.

As will be described later, after the insertion portion 31a is inserted almost snugly into the opening end 3a, the opening end 3a is heated along its entire circumference to a temperature at which thermal bonding is possible (for example, about 150 to 200°C), so that the opening end 3a is heated by thermal expansion. Looseness occurs between the insertion portion 31a and the insertion portion 31a. The vacuum hole 41a of the bottom holder 41 serves to tightly fit the bottom of the can body 3 into the recess 41b by vacuum suction, thereby preventing the can body 3 from wobbling due to the above-mentioned loosening and from generating rotational play of the can body 3. accomplish

Each support 33 has a radially movable slide shaft 33 and a slide shaft 33 of the turret 27.
A cam roller 34 is provided at the lower end of the cam roller 34. The slide shaft 33 is the support part 3 of the turret 27.
It is provided so as to be slidable along a bushing 36a provided at 6. The cam roller 34 engages independently of the turret 27 with a cam surface 35a that is the peripheral surface of a plate cam 35 fixed to a support (not shown).

Most of the cam surface 35a consists of a circumference centered on the center axis 27a of the can body conveying turret 27, but the cam surface 35a is formed of a circumference centered at the center of the central axis 27a of the can body conveying turret ₂₇ . ₂ and has an area extending from point B ₁ to point B ₂ ), as shown in FIG. 2, the can body 3
The locus 40 of the axis 3b is coaxial with the roll 19, and its radius is the sum of the radius of the outer peripheral surface of the thermally bonded part 21a, the thickness of the film piece 11, and the radius of the outer peripheral surface of the open end 3a of the can body. Slightly smaller (smaller by the value corresponding to the compression margin due to the pressing force described later of the thermal bonding part 21a made of elastic rubber; usually 0.05 to 1.00 mm)
The can body 3 is moved in the radial direction of the turret 27 so that the can body 3 becomes a part of the virtual cylindrical surface. It is formed to apply a pressing force.

Note that the tip of the film piece 11 on the thermal bonding portion 21a and the opening end 3a are simultaneously attached to the thermal bonding station B.
The value of l is determined so that the starting point _B1 is reached.
Therefore, l is set to a predetermined value that satisfies v ₁ P≈v ₂ (l+l _F ). Here, v ₁ : peripheral speed of the thermally bonded part, v ₂ : peripheral speed of the revolution of the can body axis just before the starting point B ₁ , l _F : length of the film piece, P: the can body at the starting point B ₁ ,
Circumferential center distance between subsequent adjacent can bodies.

The shaft 31c of the opening holder includes a shaft 46,
Coupling 47, clutch 48 (e.g. pneumatic clutch)
It is connected to gear 49 via. The gear 49 meshes with a gear 50 that is pivotally attached to the center shaft 27a.
0 is a sprocket 51 fixed to a gear 50,
The clutch 4 is operated by the motor through a chain 52 and a sprocket 53 that is directly connected to a motor (not shown), which is fixed to a support (not shown).
8 is closed, it is configured to rotate at a predetermined speed in the same flow direction as the roll 19, that is, in the direction of arrow R.

The clutch 48 closes as soon as the can holder device 30 holds the can 3 past the can inlet turret 26, and closes just before the thermal bonding starting point _B1 where the circumference of the cam surface 35a ends. The opening is actuated by a mechanism not shown.

On the other hand, as soon as the can body holder device 30 reaches the thermal bonding station B ₁ , the drive roll 29 contacts the contact circumferential surface 31b ₁ of the base 31b of the opening holder 31.
The holder 31 and therefore the can body 3 are rotated in the same flow direction as the pasting roll 21, that is, in the R direction. This rotational speed is such that the peripheral speed (n ₁ ) of the outer peripheral surface of the open end 3a is preferably n ₁ = (1 to 1.05) n ₂ relative to the peripheral speed (n ₂ ) of the peripheral surface of the sticking roll 21. , More preferably, the relationship n ₁ = (1.002 to 1.01) n ₂ is satisfied (therefore, the film piece 11 is attached with very slight tension), that is, the circumferential speed n ₁ is The contact peripheral surface 3 of the base 31b is set so that the peripheral speed is equal to n ₂ or slightly larger than n ₂
It is determined by setting the relationship between the outer diameter of _1b1 and the outer diameter of the drive roll 29 (taking into account the slight dent in the elastic rubber due to contact). Circumferential speed n ₁ is 1.05n ₂
If it becomes larger, the softened film piece 11 is strongly pulled during thermal bonding and becomes easier to cut. On the other hand, if the circumferential speed n ₁ becomes smaller than the circumferential speed n ₂ , the film piece 11 sag during thermal bonding and wrinkles occur. It is easy to cause troubles such as bending or meandering and falling off from the open end 3a.

Each support 32 is provided with an arcuate high-frequency induction heating coil 37 facing the open end 3a of the can body. ), electricity is applied via a rotating transformer (not shown), etc., and the open end 3a is heated almost uniformly to a temperature that allows thermal bonding by the time it reaches the thermal bonding station B, and is turned off as soon as the thermal bonding is completed. It is configured to be energized.

That is, as the can body conveying turret 27 continuously rotates, the can body 3 revolves in the direction of the arrow W, and the open end 3a of the can body 3 is heated to a temperature that allows thermal bonding by the high frequency induction heating coil 37, and the can body 3 is moved to the thermal bonding station. B
When the thermal bonding start point _B1 is reached, the turret 27
The film piece 11 on the thermal bonding part 21a and the film piece 11 on the thermal bonding part 21a move slightly inward in the radial direction, and then slightly outward in the radial direction until reaching the thermal bonding end point _B2 . The film pieces 11 are thermally bonded to the open end 3a by contacting them under a predetermined pressure while rotating.

(Function) In the thermal bonding device 6 described above, the film piece 11 is thermally bonded to the open end 3a of the can body in the following manner.

A film piece 11 of a predetermined length, width, and thickness made of a heat-adhesive plastic, such as a plastic with a relatively low melting point and a polar group, such as modified linear polyester, nylon 11 or 12, or carboxylic acid-modified polyolefin. is vacuum-adsorbed by the vacuum hole 16 to the film piece suction surface 17 of the film piece supply device 8, and then transferred to the film piece delivery station A.
At the supply station A, the adhesive is transferred onto the thermally bonded portion 21a of the adhesive roll 21, and held on the outer peripheral surface thereof by vacuum suction.

At that time, the tip of the film piece 11 and the thermally bonded part 21
Roll 19 so that the head ends of a substantially coincide with each other.
The initial position adjustment is performed. In this way, film pieces 1 of a predetermined length (l _F ) are transferred from the film piece supply device 8 to the thermal bonding roll device 9 at a predetermined interval l.
1 is sent.

On the other hand, the can body 3 is sent from the can body feed turret 26 to the can body holder device 30 of the can body transport turret 27, but before being fed, the cam follower 45 and therefore the bottom holder 41 are moving to the right. In this state, after the open end 3a of the can body is inserted into the insertion part 31a of the open end holder, the cam follower 45 moves to the left in the figure.
The recess 41b of the bottom holder 41 is inserted into the bottom of the can body 3 until the end surface of the open end 3a contacts the step 31d. Immediately, the vacuum hole 41a is connected to a vacuum device by the operation of a vacuum valve (not shown), and the bottom of the can body 3 is vacuum-adsorbed to the bottom holder 41.

The can body 3 revolves in the direction of arrow W, and the gear 4
9. While being rotated in the direction of arrow R via the clutch 48, the open end 3a is induction heated by the heating coil 37 to a temperature that allows thermal bonding, and reaches the thermal bonding starting point _B1 of the thermal bonding station B. When the starting point _B1 is reached, the drive roll 29 moves the opening end 3a of the can body through the opening holder 31.
is rotated (rotated) in the direction of arrow R at a speed where the _peripheral speed n ₁ of its outer peripheral surface is equal to or slightly larger than the peripheral speed n ₂ of the peripheral surface of the pasting roll 21. .

The open end 3a is connected to the turret 27 so that the axis 3b of the can body moves along the trajectory 40 almost simultaneously.
The film piece 11 on the thermal bonding part 21a moves in the radial direction of
It is thermally bonded under a predetermined pressure to the open end 3a, which has been coated with a primer (not shown) in advance. When the open end 3a reaches the thermal bonding end point _B2 , the rotation is stopped almost at the same time as the thermal bonding ends, and the heating coil 57
is deenergized, and the can body 3 with the film piece 11 thermally bonded to the open end 3a reaches the can body delivery turret 28 while continuing to revolve, and is delivered to the next process.
Clutch 48 is then closed.

The present invention is not limited to the above-mentioned examples, and for example, the present invention involves attaching a film piece such as a seal tape (including adhesive, gluing, etc.) to the outer peripheral surface of a cylindrical body other than a can body. It can also be applied to other purposes. Therefore, the material of the film piece is selected from paper, metal foil, woven fabric, or a laminate thereof depending on the purpose of use.

Further, in the above embodiment, the drive roll 29 shares the inner cylinder 20 with the pasting roll 21, but the drive roll 29 may be configured to have a separate inner cylinder. In this case, the drive roll may rotate the bottom holder by contacting the outer peripheral surface of the bottom holder instead of the opening holder. Alternatively, two drive rolls may be provided to drive the opening holder and the bottom holder.

(Effects of the Invention) According to the apparatus of the present invention, since the film pieces are attached to the outer peripheral surface of the cylindrical body while continuously revolving the cylinder, there is an effect that high-speed production is possible.

Furthermore, the film pieces can be attached by rotating the cylindrical body at a speed where the circumferential speed of the outer circumferential surface of the cylinder is equal to or slightly higher than the circumferential speed of the circumferential surface of the adhering roll. This has the effect that there is no risk of the film piece being cut or meandering.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an example of a metal can with a can body formed by applying the present invention, and FIG. 2 is a longitudinal cross-sectional view of an apparatus according to an embodiment of the present invention, taken along line - in FIG. 3. FIG. 3 is a cross-sectional view taken along line - in FIG. 2. 3... Can body (cylindrical body), 3b... Axial center, 11... Film piece, 21... Sticking roll, 27... Can body conveyance turret, 29... Drive roll, 31... Opening part holder, 32... Support body, 34... Cam roller, 35... Plate cam, 35a... Cam surface, 40... Trajectory of axis of can body, 41... Bottom holder, B... Heat bonding station (adhesion station).

Claims (1)

[Claims] 1. A device for pasting a film piece on the circumferential surface of a pasting roll to the outer peripheral surface of a cylindrical body, which comprises a pasting roll, a turret that continuously rotates in the same flow direction as the pasting roll, and a cylindrical body. A rotatable holder that holds the cylindrical body so that the axial center of the body is parallel to the axial center of the application roll; The cylindrical body revolves along a support body that supports it, and a sticking station that engages with a cam follower provided on the support body and in which the outer circumferential surface of the cylindrical body faces the pasting roll through the film piece. During the process, the locus of the axis of the cylindrical body is coaxial with the adhesive roll, and its radius is equal to the radius of the outer peripheral surface of the adhesive roll, the thickness of the film piece, and the outer circumference of the cylindrical body. a fixed cam for moving the support in the radial direction of the turret so that it forms part of an imaginary cylindrical surface slightly smaller than the sum of the radii of the surfaces; , the holder is placed in the same flow direction as the adhesive roll, and the circumferential speed of the outer circumferential surface of the cylindrical body is equal to or slightly greater than the circumferential speed of the circumferential surface of the adhesive roll, A film piece sticking device comprising a rotating drive roll coaxial with the sticking roll.