JPS609719A - Stripping method of transfer film in transfer molding - Google Patents

Abstract

PURPOSE:To constitute the titled method so as not to generate damage or excessive deformation of a transfer film, by enlarging a stripping angle of the transfer film from a molded aticle by sending out the same by a predetermined length in the direction giving slackness to the same of a mold side at the time of opening of a mold. CONSTITUTION:During cooling of a molded article after injection, a transfer film 71 is sent out by a predetermined length in the direction of a mold by lifting a dancer roll 77 upward and driving a feed roll 73 by driving a pulling roll 75. With this construction, it becomes that under a state directly befor mold opening, slackness by a predetermined length is given to the transfer film 71 at an upstream side of the mold and slackness by a predetermined length corresponding to a distance given until a slider 96 of the dancer roll 77 touches to a stopper 94 is given to the film 71 at a downstream side of the mold. Under the foregoing state the mold opening is performed and stripping of the transfer film 71 form the molded article is started for the first time after separation of movable force 40 from a stationary force 36 by a predetermined distance.

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 the transfer film at the same time as molding using a transfer molding device. be.

(B) Prior Art A method for peeling off a transfer film in conventional transfer molding will be described with reference to FIG. Transfer film 1
0 is a film positioning device 1 attached to a movable platen 12
4 feeding side guide roll 16 and guides 18a, 18b
The upstream side of the mold is supported by, and the winding side guide roll 20 and guide 22a of the film positioning device 14,
The downstream side of the mold is supported by 22b. On the other hand, the molded product 24 is left behind in the fixed mold 26 after molding by a method such as undercutting. 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 10 also moves to the left together with the movable platen 12, and the transfer film lO is moved away from the molded product 24 at an angle α.
It is peeled off in the state where it is formed. This stripping angle α
is formed when the transfer film 10 stretches as the transfer film 10 moves to the left. If the surface of the molded product 24 to which the transfer film 10 is attached is substantially perpendicular, even if the transfer film 10 is peeled off using the method described above, an abnormally large tensile force may act on the transfer film 10. There isn't. However, in a portion where the angle between the surface of the molded product 24 to which the transfer film 10 is attached and the vertical plane is larger than the peeling angle α, such as the angle β shown in FIG. Since there is no force component for peeling off the transfer film 10, the transfer film 10 cannot be peeled off unless a very large tensile force is applied to the transfer film 10. For this reason, a very large tension is applied to the transfer film 10 when it is peeled off, 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 article 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. In other words, the transfer film stripping method in transfer molding according to the present invention involves removing the transfer film from the mold side from both the feeding side and the winding side of the transfer film before or at the same time as opening the mold. The method is characterized in that the transfer film is fed out a certain length in a direction that gives the film some slack, and then the transfer film is peeled off from the molded product by an opening operation.

(e) Examples Examples of the present invention will now be described with reference to FIGS. 2 to 4 of the accompanying drawings.

FIG. 2 shows a transfer molding apparatus used to carry out the method of the invention. Fixed plate 3 fixed on frame 31
A movable platen 34 is guided by tie bars 33 attached to 2. A fixed mold 36 is attached to the fixed platen 32. The fixed mold 36 has two protrusions 36' on its parting surface side. Molten resin can be injected into the fixed mold 36 from an injection nozzle 39. A movable mold 40 is attached to the movable platen 34. The movable mold 40 has two recesses 40' corresponding to the protrusions 36' of the fixed mold 36. The fixed mold 36 and the movable mold 40 are guided to each other by guide pins and bushings (not shown) when the molds are closed. A frame 60 of the film positioning device is guided with respect to the movable platen 34 with respect to a horizontal lever 61 by a guide.

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 tension rolls 74 and 75 are provided. The feed roll 73 is driven by a longitudinal movement device, not shown. The frame 60 further includes a guide roll 78.
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. The dancer roll 77 can move up and down along a groove in a guide 92 attached to the frame 60. A strike damper 94 is provided on the upper part of the guide 92, and this portion is shown enlarged in FIG. The stopper 94 includes a screw 94a and a nut 94b.
and is screwed to the guide 92. Therefore, the position of the tip of the screw 94a is adjustable. The dancer roll 77 has both ends connected to the slider 9.
6, and this slider 96 is supported so as to be movable in the vertical direction with respect to the groove of the guide 92. A switch 97 is attached to the guide 92. When the switch 97 is turned on by the slider 96,
A drive (not shown) of the tension roll 75 is configured to stop.

In other words, when the switch 97 is turned on, the dancer
The position of roll 77 is the upper stopping point of 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 the 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 peeling off 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. Movable type 40 and fixed type 36
are guided to each other by a guide pin and a bushing so as not to cause misalignment. Next, the molten resin is injected from the nozzle 39 into a molding section constituted by the convex part 36' of the fixed mold 36 and the four parts 40' of the movable mold 40. By doing so, the pattern 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. The dancer roll 77 rises to the upper stopping point where the switch 97 is turned on and stops. In this state, there is a gap of the same size between the slider 96 of the dancer roll 77 and the tip of the screw 94a of the stopper 94. Also, during this time, the transfer film 71 is sent out a certain length toward the mold by driving the ## feed roll. For this reason, the feed roll 73.72
The transfer film 71 is in a loose state between the mold and the mold. After the transfer film 71 has been sent out a predetermined length, the feed rolls 73 and 72 are stopped, and the transfer film 71 is restrained by the spring force that presses the roll 72. Similarly, the tension rolls 74 and 75 also restrain the transfer film 71. After all, just before the mold is opened, the transfer film 7 is placed on the upstream side of the mold.
1 is loosened by a predetermined length, and on the downstream side of the mold, the transfer film is loosened by a distance corresponding to the distance (literature method) until the slider 96 of the dancer roll 77 contacts the stopper 94. 71 is given slack. The mold is opened from this state (that is, the movable mold 40 moves to the left in FIG. 2), but as mentioned above, since the transfer film 71 is loose, 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 is separated from the fixed mold 36 by a predetermined distance. Since the feed amount by the feed roll 73 during cooling and the feed amount of the transfer film 71 due to the movement of the dancer roll 77 are equal, the transfer film 71 can be peeled off from the two molded products at the same time. is started. The peeling angle α shown in FIG. 4 of the transfer film 71 can be freely set depending on the feed amount of the feed roll 73 during cooling and the size of the dancer roll 77 depending on the shape of the molded product. In addition, according to the results of actual tests on a certain molded product, the stripping angle α was set to 3
When the temperature was around 0 degrees, the transfer film 71 could be peeled off without causing plastic deformation to the transfer film 71. Transfer film 71 by feeding roll 73 during cooling
The feed amount can be easily adjusted by controlling the motor of the longitudinal drive device that drives the feed roll 73. Furthermore, the length of the dancer roll 77 can be easily adjusted by adjusting the stopper 94. . Further, the sentence size can also be adjusted by changing the position of the switch 97 in the vertical direction. Also,
If the pattern size 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, the 1 molding cycle is completed.

Note that the transfer molding apparatus in Example 1-H had a dancer roll, but in the case of a transfer molding apparatus without a dancer roll, the tension roll was rotated in the opposite direction to the tension direction. By doing so, the transfer film may be fed out from the winding side.

(f) As described in detail, according to the present invention, a long transfer film is sandwiched between a fixed mold and a movable mold of a transfer molding device, and the design on the transfer film is transferred at the same time as injection molding. In the transfer film stripping method in transfer molding, in which the transfer film supported on the other mold side is peeled off from the molded product left in one mold after being transferred to the molded product, the mold is opened. 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 open the mold. Since the transfer film is peeled off from the molded product by the opening action,
The peeling angle of the transfer film from the molded product can be set freely, the transfer film can be prevented from being damaged and excessively deformed, and precise transfer molding can be performed.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a transfer film peeling 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. Figure 4 showing an enlarged view of the dancer roll section of the device.
The figure shows a state in which a transfer film is being peeled off using the transfer molding apparatus shown in FIG. 2. 31Φ...Frame, 32e...Fixed plate, 33Φ...Tie bar, 34...Movable plate, 36...Fixed type, 36'
...Protrusion, 39...Injection nozzle, 40, Φ, movable type, 40'...Concave, 60, frame, 61...
Fist guide rail, No. 69, coil, 71... Transfer film, 72° 73... Feeding roll, 74.75...
Fist tension roll, 77, stand, diversion roll, 78,7
9゜80.81...Guide roll, 82, 83,
84.85 conflict...Guide bar, 9211--Guide, 9
3... Width direction moving device, 94... Stopper, 94
a...screw, 94b...war nut, 96...fist/slider, 97...0 switch. Patent applicant: Nikki Steel Co., Ltd. Agent: Toshiyuki Miyauchi, patent attorney

Claims (1)

[Claims] 1. After inserting a long transfer film between the fixed mold and the movable mold of the transfer molding device, and transferring the design on the transfer film to the molded product at the same time as injection molding, In the transfer film stripping method in transfer molding, in which the transfer film supported on the other mold side is stripped off from the molded product left in the mold, before or at the same time as the mold is opened, From both the feed side and the take-up side of the transfer film, feed the transfer film a certain length in a direction that gives slack to the transfer film on the mold side, then open the mold to remove the transfer film from the molded product. A method for peeling off a transfer film in transfer molding, which is characterized by peeling off. 2. A method for peeling off a transfer film in transfer molding according to claim 1, wherein the transfer film is fed out from the feed side by rotating a feed roll a predetermined number of times. 3. Peeling off the transfer film in transfer molding according to claim 1 or 2, in which the transfer film is fed from the winding side by rotating a tension roll a predetermined number of times in the opposite direction to the tension direction. Method. 4. The transfer molding according to claim 1 or 2, wherein the transfer film is fed out from the winding side by a dancer roll that is movable by a predetermined adjustable distance beyond the stop point of the vertical motion. How to peel off the transfer film.