JPS6154573B2 - - Google Patents

Description

Detailed Description of the Invention (a) Technical Field The present invention relates to a method of peeling off the transfer film from a molded product after transferring a design on a transfer film at the same time as molding using a transfer molding device. It is.

(b) Prior Art A conventional method for peeling off a transfer film in transfer molding will be explained based on FIG. 1. The transfer film 10 is placed on a feeding side guide roll 1 of a film positioning device 14 attached to a movable platen 12.
6 and guides 18a, 18b, and the winding side guide roll 20 and guides 22a, 22b of the film positioning device 14.
The downstream side of the mold is supported by On the other hand, the molded product 24 is produced by a method such as undercutting.
After molding, it is left behind in the fixed mold 26. After the transfer molding, when the fixed mold 26 and the movable mold 28 are opened (that is, when the movable platen 12 is moved to the left in FIG. 1), the transfer film 1
0 also moves to the left together with the movable platen 12, and the transfer film 10 is peeled off from the molded product 24 while forming an angle α therewith. This stripping angle α
is formed by stretching of the transfer film 10 as the transfer film 10 moves to the left. If the adhesion surface of the molded product 24 to the transfer film 10 is substantially perpendicular, even if the transfer film 10 is peeled off by the method described above, an abnormally large tensile force will be applied to the transfer film 10. It has no effect. However, the angle that the adhesion surface of the molded product 24 with the transfer film 10 makes with the vertical plane is the first
In the part where the angle β shown in the figure is larger than the peeling angle α, there is no force component to peel it upward from the surface to which it is attached to the molded product 24, so a very large tensile force must be applied to the transfer film 10. Otherwise, the transfer film 10 cannot be peeled off. For this reason, a very large tension is applied to the transfer film 10 during stripping, which may damage the transfer film 10 or cause excessive elongation, causing deformation of the design to be used in the next transfer. It has become difficult to accurately transfer the images.

(C) Purpose of the Invention The object of the present invention is to provide a method for peeling off a transfer film from a molded product without causing damage to the transfer film or excessive deformation of the transfer film.

(d) Structure of the Invention The present invention achieves the above object by increasing the angle at which the transfer film is peeled off from the molded product. That is, in the method of peeling off the transfer film in transfer molding according to the present invention, before opening the mold or at the same time as starting the mold opening, the transfer film is removed from the mold side from both the feeding side and the winding side. The method is characterized in that the transfer film is fed out a certain length in a direction that gives the transfer film slack, and then the transfer film is peeled off from the molded product by a mold opening operation.

(E) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 2 to 4 of the accompanying drawings.

FIG. 2 shows a transfer molding apparatus used to carry out the method of the invention. Tie bar 33 attached to fixed platen 32 fixed on frame 31
The movable platen 34 is guided by. Fixed plate 3
A fixed mold 36 is attached to 2. Fixed type 3
6 has two convex portions 36' on its parting surface side.
have. This fixed mold 36 has an injection nozzle 3
The molten resin can be injected from 9. A movable mold 40 is attached to the movable platen 34. Movable type 40
has two recesses 40' corresponding to the protrusions 36' of the fixed mold 36. Fixed type 36 and movable type 40
are guided to each other by guide pins and bushes (not shown) when the mold is closed. A frame 60 of a film positioning device is attached to the movable platen 34 so as to be movable in the horizontal direction. That is, the frame 60 is guided by a guide to a guide rail 61 attached to the movable platen 34. The frame 60 can be moved horizontally by a widthwise moving device 93. The frame 60 includes rollers that support the coil 69, feeding rolls 72 and 73 that guide the transfer film 71 unwound from the coil 69, and a tension roll 7.
4 and 75 are provided. Feeding roll 73
is driven by a longitudinal displacement device, not shown. The frame 60 further includes a guide roll 7.
8, 79, 80 and 81, and guide bar 82,
83, 84 and 85 are provided to further stabilize the transfer film 71. A dancer roll 77 is provided in front of the tension rolls 74 and 75 to apply a constant tension to the transfer film 71. Dancer roll 77 is frame 6
0 can be moved up and down along the groove of the guide 92 attached to the guide 92. A stopper 94 is provided at the upper part of the guide 92, and this part is
It is shown enlarged in the figure. The stopper 94 is a screw 94
a and a nut 94b, and is screwed to the guide 92. Therefore, screw 9
The position of the tip of 4a is adjustable. The dancer roll 77 is supported at both ends by sliders 96, and the sliders 96 are connected to the guides 9.
It is supported so as to be movable in the vertical direction with respect to the groove 2. A switch 97 is attached to the guide 92. When the switch 97 is turned on by the slider 96, the drive device (not shown) of the tension roll 75 is configured to stop. That is, the position of the dancer roll 77 when the switch 97 is turned on is the upper stopping point of the dancer roll 77. Note that the mounting position of the switch 97 can be adjusted in the vertical direction. Note that the transfer molding apparatus is also provided with a longitudinal direction sensor and a width direction sensor, which are not shown. The longitudinal sensor detects a longitudinal mark printed on the transfer film 71, stops the longitudinal drive device, and positions the transfer film 71 in the longitudinal direction. Further, the width direction sensor detects the width direction mark printed on the transfer film 71, stops the width direction drive device, and positions the transfer film 71 in the width direction.

With this transfer molding device, transfer molding and subsequent stripping of the transfer film 71 are performed in the following manner. First, in the mold open state, the feeding roll 73 is driven to feed the transfer film 71 a predetermined length to position it in the longitudinal direction. The longitudinal position of the transfer film 71 is detected by the longitudinal sensor as described above. Next, the frame 60 is moved horizontally to transfer the transfer film 71.
position in the width direction. The position in the width direction is detected by the width direction sensor as described above.
Next, the movable platen 34 moves to the right in FIG. 2, and the movable mold 40 closely contacts the fixed mold 36 with the transfer film 71 sandwiched therebetween. The movable mold 40 and the fixed mold 36 are mutually guided by guide pins and bushes so as not to be misaligned. Next, the molten resin is injected from the nozzle 39 into a molding section formed by the convex part 36' of the fixed mold 36 and the concave part 40' of the movable mold 40. By doing so, the design on the transfer film 71 is transferred to the surface of the molded product at the same time as the molded product is molded. After injection, while the molded product is being cooled, the tension roll 75 is driven to lift the dancer roll 77 upward. Dancer roll 77 is switch 97
It rises to the upper stopping point where the switch is turned on and stops.
In this state, the slider 9 of the dancer roll 77
6 and the tip of the screw 94a of the stopper 94, there is a gap of l dimension. During this time, the feeding roll 73 is driven to feed the transfer film 71 a certain length toward the mold. Therefore, the transfer film 71 is loose between the feeding rolls 73, 72 and the mold. After feeding out the transfer film 71 for a predetermined length, the feeding rolls 73 and 7
2 is stopped, and the transfer film 71 is restrained by the force of the spring pushing the roll 72. Similarly, the tension rolls 74 and 75 also restrain the transfer film 71. As a result, just before the mold is opened, the transfer film 71 is loosened by a predetermined length on the upstream side of the mold, and the slider 96 of the dancer roll 77 is stopped at the downstream side of the mold. This means that the transfer film 71 is loosened by an amount corresponding to the distance (L dimension) until it comes into contact with the transfer film 94.
The mold is opened from this state (that is, the movable mold 40 moves to the left in FIG. 2), but as described above, since the transfer film 71 is loosened, the movable mold 40 Tension begins to act on the transfer film 71 only after it is separated from the fixed mold 36 by a predetermined distance. That is, peeling off of the transfer film 71 from the molded product is started only after the movable mold 40 has moved away from the fixed mold 36 by a predetermined distance. Since the feed amount by the feed roll 73 during cooling is equal to the feed amount of the transfer film 71 due to the movement of the dancer roll 77 by l dimension, it is possible to strip the transfer film 71 from two molded products at the same time. Begins. The peeling angle α shown in FIG. 4 of the transfer film 71 can be freely set according to the shape of the molded product, depending on the feed amount of the feed roll 73 during cooling and the l dimension of the dancer roll 77. In addition, according to the results of actual tests on a certain molded product, when the peeling angle α was set to around 30 degrees, the transfer film 71 could be peeled off without giving plastic deformation to the transfer film 71. The amount by which the transfer film 71 is fed by the roll 73 can be easily adjusted by controlling the motor of the longitudinal drive device that drives the feed roll 73. Further, the l dimension of the dancer roll 77 can be easily adjusted by adjusting the stopper 94. Further, the l dimension can also be adjusted by changing the mounting position of the switch 97 in the vertical direction. Furthermore, when the l dimension is further increased, the tension roll 75 may be reversed during cooling of the molded product to lower the dancer roll 77 by a certain length. After the transfer film 71 is peeled off from the molded product in this way, the mold opening operation is stopped and the molded product is ejected from the fixed mold 36 by an ejector device (not shown). In this way, one molding cycle is completed.

Note that the transfer molding apparatus in the above embodiment was of a type having a dancer roll, but in the case of a transfer molding apparatus without a dancer roll, the tension roll can be rotated in the opposite direction to the tension direction. The transfer film may be fed out from the take-up side.

(F) Effects of the Invention As explained above, according to the present invention, a long transfer film can be transfer-molded by a film positioning device provided on a fixed plate, a movable plate, or a mold attached to these. After positioning and sandwiching between the fixed mold and movable mold of the device and transferring the design on the transfer film to the molded product at the same time as injection molding, the transfer film is restrained to the mold side where the film positioning device is installed. In a transfer film stripping method in transfer molding, the transfer film attached to the molded product is removed from the mold on the side where the film positioning device is not installed by opening the mold. Before opening the mold or at the same time as opening the mold, feed the transfer film a certain length from both the feed side and the take-up side in a direction that gives slack to the transfer film on the mold side, and then Since the transfer film is peeled off from the molded product by the mold opening operation, the peeling angle of the transfer film from the molded product can be set freely, and damage and excessive deformation of the transfer film can be prevented. It is also possible to perform precise transfer molding.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a transfer film stripping method in conventional transfer molding, Fig. 2 is a diagram showing a transfer molding apparatus for carrying out the method of the present invention, and Fig. 3 is a diagram showing the transfer molding shown in Fig. 2. FIG. 4 is an enlarged view showing the dancer roll portion of the apparatus, and FIG. 4 is a view showing a state where the transfer film is being peeled off using the transfer molding apparatus shown in FIG. 2. 31... Frame, 32... Fixed plate, 33...
Tie bar, 34...Movable plate, 36...Fixed type, 3
6'...Convex part, 39...Injection nozzle, 40...Movable type, 40'...Concave part, 60...Frame, 61
... Guide rail, 69 ... Coil, 71 ... Transfer film, 72, 73 ... Feeding roll, 74,
75...Tension roll, 77...Dancer roll,
78, 79, 80, 81...Guide roll, 8
2, 83, 84, 85...guide bar, 92...
Guide, 93... Width direction moving device, 94... Stopper, 94a... Screw, 94b... Nut, 9
6...Slider, 97...Switch.

Claims (1)

[Claims] 1. A long transfer film is positioned between a fixed mold and a movable mold of a transfer molding device by a film positioning device provided on a fixed plate, a movable plate, or a mold attached to these. After transferring the design on the transfer film to the molded product at the same time as injection molding, the transfer film is restrained to the mold side where the film positioning device is installed and the mold is opened. In the transfer film stripping method for transfer molding, in which the transfer film attached to the molded product left on the side of the mold where no At the same time, the transfer film is fed a certain length from both the transfer film feeding side and the winding side in a direction that gives slack to the transfer film on the mold side, and then the transfer film is opened by the mold opening operation. A method for peeling off a transfer film in transfer molding, characterized by peeling off a film from a molded product. 2. To feed the transfer film from the feeding side,
A method for peeling off a transfer film in transfer molding according to claim 1, which is carried out by rotating a feed roll a predetermined number of times. 3. To feed the transfer film from the winding side,
Claim 1 in which the pulling roll is rotated a predetermined number of times in a direction opposite to the pulling direction.
Or the method for peeling off a transfer film in transfer molding according to item 2. 4. To feed the transfer film from the winding side,
3. A method for peeling off a transfer film in transfer molding according to claim 1 or 2, which is carried out by a dancer roll that is movable by an adjustable predetermined distance beyond a stop point of vertical movement.