JPH0360653B2 - - 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 platen 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 designs.

(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 provides for separating the transfer film from the molded product by using not only the feeding side guide and the winding side guide but also the intermediate guide provided between the molded parts, and separating the transfer film from both sides of each molded product. By tearing off the transfer film,
Achieve the above objectives.

(E) Embodiments Hereinafter, embodiments of the present invention will be explained as shown in the second and third figures of the attached drawings.
This will be explained based on the diagram.

FIG. 2 shows a transfer molding apparatus used to carry out the method of the invention. Two convex portions 36' provided on the fixed mold 36 and a corresponding movable mold 4
Two molded parts are formed by the two recessed parts 40' provided at 0. A transfer film 71 is placed between the fixed mold 36 and the movable mold 40,
The transfer film 71 is fed to the feed side guides 82 and 83 on the upstream side of the mold, and the winding side guide 84 on the downstream side of the mold.
85, and is further guided by an intermediate guide 86 provided at the center of the movable mold 40 (that is, at the middle of the two molding sections). The transfer film 71 is transferred to a feeding side guide 82,
83, then the movable mold 40 and the intermediate guide 8
6, and further passes between the winding side guides 84 and 85. The intermediate guide 86 is connected to the support 8
7 to the movable mold 40. Note that the fixed mold 36 is provided with a recess 36a to prevent the intermediate guide 86 from interfering when the fixed mold 36 and the movable mold 40 come into close contact with each other on the parting surface. The transfer molding device has a feed roll 73 provided at the top of a movable plate (not shown) to which the movable die 40 is attached, and a take-up roll 75 provided at the bottom. It is possible to sequentially feed a predetermined length from the top to the bottom in FIG. Further, the feeding roll 73 and the winding roll 75 move together with the transfer film 71 in the film width direction (that is, in the horizontal direction) together with the feeding side guides 82 and 83 and the winding side guides 84 and 85. As a result, the transfer film 71 is positioned in the width direction. The longitudinal and widthwise positioning of the transfer film 71 is performed by detecting marks on the transfer film 71 by a longitudinal sensor and a width sensor (not shown).

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 is detected by a longitudinal sensor (not shown). Next, the transfer film 71 is positioned in the width direction. The position in the width direction is detected by a width direction sensor (not shown). Next, the movable mold 40 moves to the right in FIG. 2, and the movable mold 40 comes into close contact with the fixed mold 36. Therefore, the transfer film 71 is sandwiched between the movable mold 40 and the fixed mold 36. The movable mold 40 and the fixed mold 36 are mutually guided by guide pins and pushers so as not to be misaligned.
Next, the molten resin is injected from a nozzle (not shown) into a molding section constituted by the convex portion 36' of the fixed mold 36 and the concave portion 40' of the movable mold 40. By doing this, the pattern on the transfer film 71 is transferred to the surface of the molded product 88 at the same time as the molded product 88 is molded. At this time, the feeding side guides 82, 8
3. Winding side guides 84, 85, intermediate guide 86,
and the position of the transfer film 71 are shown by imaginary lines in FIG. Next, after cooling the molded product 88, the mold is opened and the transfer film 71 is stripped off. That is, the movable mold 40 moves to the left in FIG. Since the transfer film 71 is restrained by a feed roll 73 and a take-up roll 75 on the upstream and downstream sides of the mold, respectively, the transfer film 71 is restrained by a feed-side guide 83 and a take-up-side guide 8 as shown in FIG.
4 and the intermediate guide 86 to the left, and are stripped off from both the upper and lower sides of each molded article 88 while forming stripping angles α ₁ and α ₂ , respectively. Since the transfer film 71 is peeled off from both sides of the molded product 88, the ends of the molded product 88 form an angle β larger than the angles α ₁ and α ₂ with respect to the vertical plane, as shown in FIG. Even if
The transfer film 71 can be easily peeled off because it receives an upward force from the surface to which it is attached. Therefore, even in the case of molding a large number of molded products where the angle β is close to 90 degrees, the transfer film 71 can be peeled off without being damaged. In addition, each molded product 8
Since the transfer film 71 is removed from both sides of the transfer film 8, the time required for removal is also shortened.

The embodiment shown in FIGS. 2 and 3 above was for a two-cavity molding (that is, two molded parts), but in the case of a three-cavity molding, for example, as shown in FIG. An intermediate guide 86 may be provided between each molding section. In addition, in the case of having a larger number of molded parts, intermediate guides may be provided between all the molded parts, or intermediate guides may be provided only in parts that are difficult to peel off.

(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. The transfer film is positioned between multiple molding parts of the machine's mold and inserted, and the design on the transfer film is transferred to each molded product at the same time as injection molding, and then transferred to the mold side where the film positioning device is installed. In a transfer film stripping method in transfer molding, in which the transfer film attached to a plurality of molded products left behind in the mold on the side where the film positioning device is not provided is stripped off by restraining the film and opening the mold,
Forming a gap for guiding the film through which the transfer film is inserted between the feeding side guide and take-up side guide for guiding the film provided on the mold side where the film positioning device is installed and the mold parting surface. When the transfer film is fixed between the molding parts of the mold and moves relatively away from the mold parting surface, the transfer film contacts and the transfer film is moved further away than the above gap. The transfer film is peeled off from the molded product by separating the transfer film from the molded product during the mold opening operation using an intermediate guide that can prevent it from leaving the mold, so it has a large adhesion surface. Even in the case of molding a large number of molded products, the transfer film can be peeled off without causing damage or excessive deformation of the transfer film. Moreover,
Since stripping is performed from both sides of the molded product, stripping time is also shortened.

[Brief explanation of drawings]

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, which is a view of the apparatus taken along the - line, shows a second embodiment of the present invention. 36... fixed type, 36'... convex part, 40... movable type, 40'... concave part, 71... transfer film,
82, 83... feeding side guide, 84, 85... winding side guide, 86... intermediate guide, 88... molded product.

Claims (1)

[Claims] 1. A long transfer film is moved between a plurality of molding sections of a 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. Position and insert,
After the design on the transfer film is transferred to each molded product at the same time as injection molding, the transfer film is restrained on the side of the mold where the film positioning device is installed and the mold is opened, whereby the film positioning device is installed. In the transfer film stripping method in transfer molding, in which the transfer film attached to multiple molded products left on the side of the mold that is not covered is removed, a film guide provided on the side of the mold where the film positioning device is installed is used. The transfer film is fixed between the molding parts of the mold so as to form a gap for guiding the film through which the transfer film is inserted between the feeding side guide and winding side guide of the mold and the parting surface of the mold. an intermediate guide capable of contacting the transfer film when relatively moved in a direction away from the mold parting surface and preventing the transfer film from moving farther than the gap;
A method for peeling off a transfer film in transfer molding, characterized in that the transfer film is peeled off from a molded product by separating the transfer film from the molded product during a mold opening operation.