JPH10272898A - Transferring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer a thermal transfer film to a surface to be transferred of a conical surface state of a truncated conical molding without generating a wrinkle, cutout or close contact fault. SOLUTION: The transferring apparatus comprises a transfer base 2 for rotatably supporting a molding M, a thermal transfer film unwinder 3 for supplying a thermal transfer film F to a surface S to be transferred, a truncated conical transfer roll 4 for rotatably driving the molding M while bringing the film F into contact with the surface S, and a heater 5 for heating a surface of the roll 4. In this case, when an apex angle of the truncated cone of the roll 4 is indicated by α, an apex angle of the truncated cone of the molding M is indicated by ', an angle θ formed between the rotating center line O4 of the roll 4 and the rotating center line O2 of the base 2 is set to [(α+β)/2]-5 deg. to [(α+β)/2]+5 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer method which is preferably used for transferring a thermal transfer film to a conical surface of a truncated conical shaped article such as a plastic bucket to give a picture or pattern. Related to the device.

[0002]

2. Description of the Related Art Conventionally, a transfer device for transferring a thermal transfer film onto a conical surface (transfer surface) of a truncated cone-shaped molded product (transfer object) such as a plastic bucket has conventionally been used.
A transfer device as shown in FIG. 4 is known. The transfer device a has a transfer table b that supports the transfer target M rotatably around a rotation center line x. The transfer table b is set so that the upper generating line L of the supported transfer object M is horizontal.
The rotation center line x is installed slightly inclined from the horizontal direction, and a cylindrical transfer roll r is installed horizontally above the transfer table b, and the height of the transfer roll r can be adjusted vertically. Have been. A heater h for heating the surface of the transfer roll r is provided above the transfer roll r. The heater h, the heat radiating surface h ₁ is formed in a cylindrical surface shape,
In addition, it is installed in parallel with the side surface of the transfer roll r. Then, the thermal transfer film F is placed between the transfer target M and the transfer roll r.
Is provided with a thermal transfer film feeding mechanism c for feeding an image.

In order to transfer the thermal transfer film F (width f) onto the transfer surface S of the transfer object M, the transfer roll r is lowered to sandwich the thermal transfer film F between the transfer object M and the transfer roll r. The transfer roll r is driven to unwind the heat transfer film from the heat transfer film feeding mechanism c, and the transfer roll r, the surface of which is heated by the heater h, is pressed against the transfer surface S and transferred.

[0004]

Meanwhile [0008] Since the diameter of the cylindrical transfer roller r is P ₁ point diameter and P ₂ points (thermal transfer upper portion of the film F) (the lower end) is the same, P ₁
The peripheral velocity v _{1 of the} point and the peripheral velocity v _{2 of the} point P ₂ are equal (v ₁ =
v ₂ ). However, the transcript M having a conical shape of the transfer surface, to a diameter of _one point and P ₂ points P are different, the circumferential speed V ₁ and P ₂ points P ₁ point as shown in FIG. 5 The relationship between the peripheral velocities V ₂ is V ₁ > V ₂ , and at the point P ₂ , Δv = v ₂ −V ₂
, The thermal transfer film F fed between the transfer target M and the transfer roll r may have poor appearance such as "wrinkles" and "chips".

In addition, since the surface of the transfer roll r and the heat radiating surface of the heater h are cylindrical with respect to the conical surface to be transferred, the transfer roll r receives heat per unit surface area or unit weight. And the amount of heat dissipated, resulting in a difference in the surface temperature of the transfer roll r. As a result, partial adhesion failure may occur.

The present invention has been made in view of such problems of the prior art, and transfers a heat transfer film to a conical surface of a truncated conical shaped product such as a plastic bucket to transfer a picture or pattern. It is an object of the present invention to provide a transfer device that does not cause wrinkling or chipping in the thermal transfer film and does not cause partial adhesion failure of the thermal transfer film.

[0007]

In order to achieve the above object, the present invention relates to a transfer device for transferring a thermal transfer film onto a conical surface of a frusto-conical shaped product, the device comprising: A rotatable transfer table, a thermal transfer film feeding mechanism for feeding the thermal transfer film to the surface to be transferred, and a frusto-conical shape for rotating the molded product while bringing the thermal transfer film into contact with the surface to be transferred. A transfer roll and a heater for heating the surface of the transfer roll. When the apex angle of the truncated cone of the transfer roll is α, and the apex angle of the truncated cone of the molded product is β, the rotation center of the transfer roll and the transfer stand. The angle θ between the lines is [(α + β) / 2] -5 ° to [(α + β) / 2] + 5 °.

[0008] transfer roll of the present invention the transfer device, the upper end abuts against portions of the thermal transfer film of the transfer roll (P ₁ point in FIG. 1 described later), and a lower end portion abutting the thermal transfer film (in FIG. 1 P the diameter of the _two points), each portion (P ₁
Point, it is most preferably formed in a truncated cone having the same diameter as the ratio of the diameter of the transfer of the P ₂ points), wide-ranging the shape of the material to be transferred, having a number of transfer rolls that matches therewith When the transfer is complicated and not economical, it is preferable to use a transfer roll having a taper as close as possible to the above ratio.

The angle θ formed between the rotation center lines of the transfer roll and the transfer table is [(α + β) / 2] -5 ° to [(α + β) / 2] + 5 ° (1), but is preferably , [(Α + β) / 2] −2 ° to [(α + β) / 2] + 2 °. If θ is outside the range of (1), the thermal transfer film is not sufficiently and uniformly pressed onto the surface to be transferred, and the transfer is incomplete.

The heater for heating may have an integral structure or a divided structure. Further, it is preferable that the heating control block is divided into a plurality of heating control blocks so that the temperature can be controlled for each heating control block.

[0011]

According to the transfer apparatus of the present invention, the angle .theta. Formed between the rotation center lines of the transfer roll and the transfer table is set to [(α + β) / 2] -5 ° to [(α + β) / 2] + 5 °. With the large-diameter side of the transferred object and the large-diameter side of the transfer roll almost completely pressed against each other, and the small-diameter side of the transferred object and the small-diameter side of the transfer roll almost completely pressed against each other. Rotate. Therefore, there is almost no difference between the peripheral speeds of the transfer roll and the object to be transferred, and the transfer is performed without applying excessive tension or twist to the thermal transfer film between the transfer roll and the object to be transferred.

Further, since the transfer roll and the object to be transferred are disposed with their conical surfaces facing each other in the same direction, the surface temperature of the object to be transferred becomes almost constant at all portions, and the heat transfer film becomes substantially uniform. Is transferred to the transfer surface.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a partially cutaway front view showing an embodiment of the transfer device of the present invention in which a pattern is attached to the side surface of a plastic bucket, FIG. 1B is a side view, and FIG. FIG. 1 (A) is an explanatory view showing the relationship between the transfer roll and the peripheral speed of the transfer object at point P _1, and FIG.
FIG. 3 is an explanatory diagram showing the relationship between the transfer roll and the peripheral speed of the transfer object at _two points, and FIG. 3 is an explanatory diagram showing FIG. 2 as a graph.

In the transfer apparatus 1 shown in FIG. 1, reference numeral 2 denotes a plastic bucket (hereinafter simply referred to as a bucket) M having a conical side surface S as an object to be transferred, which is rotated around a rotation center line O _2. Transfer table 3 to support while transfer table 2
An unwinder (thermal transfer film feeding mechanism) for feeding the thermal transfer film F to the side surface (transfer surface) S of the upper bucket;
Is a frusto-conical shape that rotates the bucket M while rotating the bucket M while the thermal transfer film F unwound from the unwinder 3 is driven to rotate around the rotation center line O ₄ by an electric motor (not shown). The transfer rolls 5 and 5 are far-infrared heaters disposed around the transfer roll 4. The transfer roll 4 can be moved up and down by a lifting mechanism (not shown).

[0014] transfer base 2, if the apex angle is mounted bucket M of beta, as bus L of the top of the bucket M is horizontal position, the rotation axis O ₂ from the horizontal beta / 2 It is installed only at an angle. The transfer roll 4 has an apex angle α, and its rotation center line O ₄ and the rotation center line O _{2 of the} bucket M
The angle θ between them is set to be [(α + β) / 2] -5 ° to [(α + β) / 2] + 5 °.

The far-infrared heater 5 is disposed on the outer surface of the transfer roll 4 so as to cover substantially the upper half of the transfer roll 4 and to be substantially parallel to the surface of the transfer roll (in a vertical section). The heat radiating surface 51 of the far-infrared heater 5 is formed in an inner conical surface substantially parallel to the surface of the transfer roll. Therefore, the distance between the heat radiation surface 51 and the surface of the transfer roll is substantially constant. The far-infrared heater 5 is divided into several heating control blocks in the longitudinal direction, and the temperature can be controlled for each heating control block.

Hereinafter, the operation of the transfer device 1 will be described. While rotating the transfer roll 4, the far-infrared heater 5
Heats the side surface S. Next, when the thermal transfer film F is guided onto the bucket M supported by the transfer table 2 and the transfer roll 4 is lowered, the bucket M is rotated by the transfer roll 4, and the bucket M and the transfer roll 4 on which the thermal transfer film F rotates are rotated. The transfer roller 4 is unwound from the unwinder 3 and is softened by being brought into contact with the transfer roll 4 heated to a high temperature.
Is pressed against the surface of the substrate and transferred.

The transfer roll 4 is formed in the shape of a truncated cone similar to the bucket M. As shown in FIG. 2 or 3, the bucket M extends over the entire width f of the thermal transfer film F.
Since there is almost no difference between the peripheral speeds of the heat transfer film 4 and the transfer roll 4, the thermal transfer film F is fed without excessive tension or twisting, and the transfer is performed.

The heat radiation surface 51 of the far-infrared heater 5 is formed in an inner conical surface substantially parallel to the surface of the transfer roll 4.
Further, since the transfer roll 4 is disposed substantially parallel to the surface of the transfer roll 4, a heat amount proportional to the surface area is supplied to the transfer roll 4 from a heater. As a result, the surface temperature of the transfer roll 4 becomes substantially uniform, so that non-uniform pressure bonding and poor adhesion due to the difference in surface temperature hardly occur. Further, the transfer roll 4
Surface temperature control becomes easy.

Hereinafter, specific embodiments of the present invention will be described. (Embodiment) Using a transfer device 1 provided with a transfer roller 4 having a truncated cone shape as shown in FIG.
The thermal transfer film F was transferred to the side surface of an 8 ° polyethylene resin bucket M. The angle of the rotation axis O ₂ between the rotation center line O ₄ and bucket M of the transfer roller 4 theta was 12 °. The surface temperature of the transfer roll 4 is set to 220 ° C.
On the other hand, the larger diameter side (P ₁ side) is 225 ° C. and the smaller diameter side (P ₂ side)
Side) was 215 ° C and there was a temperature difference of 10 ° C. As a result, no wrinkling or chipping was observed on the thermal transfer film F, and non-uniformity or poor adhesion was not observed, and good transfer was performed.

(Comparative Example) A thermal transfer film F was transferred in the same manner as in the example except that a transfer device a provided with a cylindrical transfer roll r as shown in FIG. 4 was used. The surface temperature of the transfer roll r is, P ₁ side is 240 ° C., with P ₂ side is 200 ° C.,
There was a temperature difference of 40 ° C. As a result, the thermal transfer film F
The wrinkles and chippings were observed, and uneven adhesion and poor adhesion were observed, and the appearance was poor.

[0021]

As is apparent from the above description, the transfer apparatus of the present invention has almost no difference in the peripheral speed between the transfer roll and the transfer object, and cannot apply a thermal transfer film between the transfer roll and the transfer object. Transfer is performed in a state in which no excessive tension or twist is applied, and wrinkles and chips are not easily generated in the thermal transfer film. In addition, since the thermal transfer film is transferred onto the transfer surface at a substantially uniform temperature, uneven adhesion and poor adhesion are unlikely to occur.
As a result, a clear and defect-free pattern is transferred to the transfer target. Further, control of the surface temperature of the transfer roll is easier than in the related art.

As a result, the production efficiency is increased and the material loss is reduced, so that the cost can be reduced.

[0023]

[Brief description of the drawings]

FIG. 1A is a partially cutaway front view showing an embodiment of a transfer device of the present invention, and FIG. 1B is a side view.

FIG. 2 is an explanatory diagram showing a relationship between a transfer roll of the transfer device shown in FIG. 1 and a peripheral speed of an object to be transferred;

FIG. 3 is an explanatory view showing a graph of FIG. 2;

FIG. 4A is a partially cutaway front view showing a conventional technique;
(B) is a side view.

FIG. 5 is an explanatory diagram showing the relationship between the transfer roll of the related art shown in FIG. 4 and the peripheral speed of an object to be transferred;

FIG. 6 is an explanatory view showing a graph of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transfer apparatus 2 Transfer stand 3 Thermal transfer film feeding mechanism (unwinding machine) 4 Transfer roll 5 Heater (far-infrared heater) 51 Heat radiating surface F Thermal transfer film M Transfer object (plastic bucket) O ₂ Transfer object (plastic) Rotation center line of bucket (made of bucket) O ₄ Rotation center line of transfer roll S Transfer surface (side surface) α Apex angle of transfer roll β Apex angle of transfer object (plastic bucket) θ Rotation center line of transfer roll and transfer table Angle between each other

Claims (1)

[Claims] 1. A transfer device for transferring a thermal transfer film onto a conical surface to be transferred of a frustoconical molded product, the transfer table rotatably supporting the molded product, and a thermal transfer film on the transferred surface. A transfer mechanism comprising a heat transfer film feeding mechanism for feeding, a frusto-conical transfer roll for driving the molded product to rotate while abutting the heat transfer film on the surface to be transferred, and a heater for heating the surface of the transfer roll; When the apex angle of the truncated cone of the roll is α and the apex angle of the truncated cone of the molded product is β, the angle θ between the rotation center lines of the transfer roll and the transfer stand is [(α + β) / 2] −5. ° to [(α + β) / 2] + 5 °.