JP2015217567A - In-mold injection molding die and in-mold injection molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve satisfactory in-mold molding free from foil burr and edge face peeling even in molding using a thick transfer film imparted with a layer having functionality.SOLUTION: In the in-mold injection molding die, the first projecting part 15a is formed at the edge part of the third die 3, by the closing of the first die 1, the second die 2 and the third die 3, the first projecting part 15a is bitten into the decorative layer 10 of a transfer film 8, and, upon the die opening, since a crack causing an origin to shear by the decorative layer is formed on the transfer film 8, even in a thick transfer film, an in-mold molding free from foil burrs and edge face peeling can be obtained.

Description

  The present invention relates to an in-mold injection mold.

  In in-mold injection molding, a transfer film generally used has a laminated structure, and a PET (polyethylene terephthalate) resin is used as a material of a base film. The transfer film is roughly classified on the base film, and is composed of a release layer, a decorative layer, and an adhesive layer in this order. These three layers are collectively referred to as a decorative foil. When transferring the decorative foil of the transfer film to the resin molded product, the adhesive layer on the upper surface of the decorative layer adheres the decorative layer and the resin molded product by heat during molding, and the PET film and the decorative layer are peeled layers. Peeled off at the border.

In such in-mold injection molding, a method described in Patent Document 1 has been proposed as a method for reducing the generation of wrinkles and foil burrs on a decorative foil.
FIG. 9 shows an in-mold injection mold described in Patent Document 1.

  The first mold 21 and the second mold 22 constitute a cavity. The first mold 21 is attached to the molding machine stationary side platen 23. The second mold 22 is attached to the molding machine movable side platen 24. The transfer film 8 conveyed by the film supply device 25 is sandwiched between the first mold 21 and the second mold 22 and clamped. A slide core 26 that constitutes a cavity contour portion is attached to the first mold 21 via a spring 27 that biases the second mold 22 with a constant pressure.

  At the time of molding, the slide core 26 forms the contour and fixes the transfer film 8 to suppress the occurrence of wrinkles at the contour of the molded product. Further, the molding resin is injected into the cavity, and after the mold cooling, the mold is opened with the cavity contour portion of the transfer film 8 fixed by the slide core 26. At this time, by separating the decorative foil from the base film of the transfer film 8 at the molding portion and the non-molding portion of the molded product in the cavity contour portion, the decorative foil is cut out in accordance with the contour portion shape, and foil burrs are generated. Suppress.

JP 2010-173167 A

  In recent years, in-mold molded products are required to be decorated with functionalities such as scratch resistance, weather resistance, antireflection, reflectivity, and electromagnetic shielding, as well as design decoration. It has become.

FIG. 10 (a) shows a transfer film 8 having no functionality.
A decorative layer 10 and an adhesive layer 11 are formed on the base film 9. The base film 9 includes a base film 9a and a release layer 9b. The decorative layer 10 includes a hard coat layer 10a, an anchor layer 10b, a colored layer 10c, and a concealing layer 10d. Reference numeral 17 denotes a molding resin when it is decorated and becomes an in-mold molded product.

FIG. 10B shows the transfer film 8 with added functionality.
In this case, since the hard coat layer 10a in FIG. 10 (a) is replaced with the functional layer 10e having a film thickness rather than the hard coat layer 10a, the decorative layer 10 is thicker than in the case of FIG. 10 (a). That is, the thickness becomes about 30 to 70% compared with a transfer film having no functionality.

  The layer thickness is expected to increase further in the future. When the transfer film 8 is thickened, in the conventional in-mold injection mold, the decorative layer 10 is peeled off from the end surface of the molding resin 17 when the decorative layer 10 is separated from the base film 9. Problem occurs.

  The present invention solves the above-mentioned problem, and even when a thick transfer film having functionality is used, a good quality in-mold molded product can be obtained without causing foil peeling of the resin end face portion. An object of the present invention is to provide an in-mold injection mold.

  The in-mold injection mold of the present invention is a cavity formed by clamping a first mold and a second mold with a transfer film interposed therebetween, and the surface of the molding resin is applied with a decorative layer of the transfer film. In an in-mold injection mold for creating a decorated in-mold molded product, a foil pressing plate that clamps a transfer film against a clamping surface of a second mold, and between the cavity and the foil pressing plate, A suction circuit that sucks the transfer film into the second mold, and moves in the mold opening direction in conjunction with the mold clamping and mold opening, and the transfer film between the foil pressing plate and the cavity in the mold clamping state. A third mold that presses and clamps against the clamping surface of the second mold, and at the edge portion of the bottom surface of the third mold, along the contour of the cavity, in the clamped state Previous It provided with the first convex portion biting into the decorative layer of the transfer film, characterized in that.

  The in-mold injection mold of the present invention is a cavity formed by clamping the first mold and the second mold with the transfer film interposed therebetween, and the surface of the molding resin is decorated on the decorative layer of the transfer film. In the in-mold injection mold for creating the in-mold molded product decorated with the foil pressing plate that clamps the transfer film against the clamping surface of the second mold, and between the cavity and the foil pressing plate A suction circuit that sucks the transfer film into the second mold, and moves in a mold opening direction in conjunction with the mold clamping and mold opening, and the mold holding state between the foil pressing plate and the cavity The transfer film is pressed against the clamp surface of the second mold and clamped, and the cavity surface of the second mold forming a part of the cavity is directed toward the first mold. Protruding And a product opening hole formed on the cavity surface of the first mold that forms a part of the cavity corresponding to the product opening hole, and the tip of the product is in a clamped state. Provided a nest to be installed in the opening hole, provided a second convex portion to bite into the decorative layer of the transfer film in the clamped state at the edge portion of the product opening hole at the tip of the nest, It is characterized by that.

  The in-mold injection molding method of the present invention is a cavity formed by clamping a first mold and a second mold with a transfer film interposed therebetween, and the surface of the molding resin is decorated with a decorative layer of the transfer film. In the in-mold injection molding method for producing the in-mold molded product, in the mold-clamping state, the third mold is located on the outer periphery of the first mold and constitutes the cavity together with the first mold and the second mold. In order to shear the decorative layer by causing the first convex portion formed along the contour of the cavity to bite into the decorative layer of the transfer film at the edge portion of the mold closer to the second mold Forming a portion having a small force required for the transfer film, injecting molding resin into the cavity, melting the adhesive layer of the transfer film at the temperature of the molding resin, and then cooling to form the decorative layer Adhesion to resin After generating the crack starting from the notch formed by the first convex portion that bite into the decorative layer with the mold opening while sucking the transfer film to the second mold, The decorative layer is fractured starting from the crack portion.

  The in-mold injection molding method of the present invention is a cavity formed by clamping the first mold and the second mold with the transfer film interposed therebetween, and the surface of the molding resin is a decorative layer of the transfer film. In the in-mold injection molding method for creating a decorated in-mold molded product, in a mold-clamping state, toward the cavity surface of the second mold that forms a part of the cavity, toward the first mold side. The front end of the nest positioned on the cavity surface of the first mold that forms a part of the cavity corresponding to the protruding product opening hole is disposed on the product opening hole, and The second convex portion formed at the edge portion of the tip of the nest is made to bite into the decorative layer, and a portion having a small force necessary for shearing the decorative layer is formed on the transfer film, and the cavity Nari The resin is injected, the adhesive layer of the transfer film is melted at the temperature of the molding resin, and then cooled to bring the decorative layer into close contact with the molding resin, while the transfer film is sucked into the second mold Along with the mold opening, after generating a crack starting from the notch formed by the first convex portion that bites into the decorative layer, the decorative layer is broken starting from the crack. It is characterized by that.

  According to the present invention, the first convex portion is formed on the edge portion of the third mold, and the first convex portion is decorated on the transfer film by clamping the first die, the second die, and the third die. By forming a crack in the transfer film that bites into the layer and the decorative layer shears when the mold is opened, the decorative foil increases in thickness by adding functionality, and the decorative foil itself breaks in the layer Even in-mold resin injection molding using a transfer film with increased elongation, the resin and decorative foil are not peeled off at the resin end face when the film is peeled off, and a good appearance quality with no occurrence of foil burrs is maintained. In-mold molded products can be obtained.

(A) Sectional view and (b) Enlarged view of main part of in-mold injection mold of Embodiment 1 of the present invention (A)-(e) is process drawing of the molding cycle of the embodiment The expanded sectional view of the mold clamping completion state in which the transfer film is compressed and fixed between the flat surface of the third mold and the flat surface of the first mold An enlarged cross-sectional view of a state in which the mold resin has started to be opened slightly after the mold resin injection and cooling have been completed. Furthermore, an enlarged cross-sectional view with the mold open Enlarged sectional view before the mold is fully opened and the in-mold product is removed from the mold Sectional drawing of the in-mold injection mold in Embodiment 2 of this invention Sectional drawing of the in-mold injection mold in Embodiment 3 of this invention Cross section of a general in-mold injection mold (A) An enlarged sectional view of a transfer film without function addition and (b) An enlarged sectional view of a thick film transfer film with function added. Enlarged sectional view of the clamping state of the in-mold injection mold of the comparative example Enlarged sectional view of the in-mold injection mold of the comparative example in the initial state of mold opening Enlarged cross-sectional view of the comparative example with further mold opening Enlarged cross-sectional view of the comparative example with further mold opening

Hereinafter, each embodiment of the present invention will be described in comparison with a comparative example.
(Embodiment 1)
FIG. 1A shows an in-mold injection mold according to the present invention. An enlarged view of the main part P in FIG. 1A is shown in FIG.

  The mold is composed of a first mold 1 on the fixed side, a second mold 2 on the movable side, and a third mold 3 described later. The first mold 1 is attached to the mold plate 4 and the second mold 2 moves with respect to the first mold 1 over the mold opening position and the mold clamping position. The state of the second mold 2 shown in FIG. 1A shows a state during mold opening in the molding cycle. The third mold 3 is disposed on the outer periphery of the first mold 1 and is attached to the mold plate 4 via springs 5a and 5a so that the third mold 3 is pushed out in the direction of the second mold 2. It has become.

  A concave cavity surface 6 is formed in the second mold 2. A convex cavity surface 7 is formed in the first mold 1. In the clamped state, the first mold 1, the second mold 2 and the third mold 3 form a cavity of the product shape portion.

  A transfer film 8 is inserted between the first mold 1 and the second mold 2. As shown in FIGS. 10 (a) and 10 (b), the transfer film 8 has a decorative layer 10 formed on the base film 9, and further an adhesive layer 11 formed on the decorative layer 10. Yes.

Reference numeral 12 denotes a frame-shaped foil pressing plate that clamps the transfer film 8 by pressing it against the clamping surface 2 a of the second mold 2. Reference numeral 13 denotes an O-ring attached to the lower surface of the foil pressing plate 12.
Reference numeral 14 denotes a suction flow path formed in the second mold 2, which opens outside the outermost periphery of the cavity surface 6. The suction flow path 14 may be a flow path connected in the second mold 2 or a single flow path, and may be either one as long as it performs a suction function.

  Here, the third mold 3 presses the transfer film 8 against the clamp surface 2 a of the second mold 2 inside the foil pressing plate 12. As shown in the enlarged view of FIG. 1 (b), the third mold 3 has an inner peripheral side of the surface that presses the transfer film 8 against the clamp surface 2 a of the second mold 2, that is, the first mold 1. A V-shaped first convex portion 15a is formed at the corner of the lower end of the slide surface. This 1st convex part 15a is formed along the outline of a molded article.

x is the thickness of the decorative layer 10 of the transfer film 8, y is the height of the first protrusion 15 a in the mold opening direction (= clamping direction), and z is the stroke of the third mold 3.
The configuration of FIGS. 1A and 1B will be described in detail based on the molding cycle shown in FIGS.

FIG. 2A is the same as FIG. 1A in a state where the second mold 2 is in the mold opening position.
In FIG. 2B, the set transfer film 8 is pressed against the second mold 2 by the foil pressing plate 12 and clamped. Further, the transfer film 8 is stretched along the cavity surface 6 of the second mold 2 by being sucked by the suction flow path 14 of the second mold 2.

In FIG. 2C, the second mold 2 approaches the first mold 1 and the mold clamping starts.
As a result, the first convex portion 15 a of the third mold 3 contacts the upper surface of the transfer film 8, and the first convex portion 15 a bites into the adhesive layer 11 of the transfer film 8 as the mold clamping proceeds. When the mold is further closed, as shown in FIG. 3, the first convex portion 15a penetrates through the adhesive layer 11 and bites into the decorative layer 10 to form the notch 16 in the transfer film 8. Finally, the third mold 3 is in contact with the surface of the transfer film 8.

When the mold is further closed by the distance of the stroke z, as the mold clamping progresses, the force T by which the transfer film 8 is pressed by the third mold 3 increases. The relationship between the force N by which the third mold 3 is pushed out by the spring 5a and the force T by which the transfer film 8 is pressed by the third mold 3 is as follows.
N <T
At that time, the third mold 3 starts to move against the bias of the spring 5a, and the mold clamping is completed.

  Thus, by biting into the decorative layer 10 of the first convex portion 15a, the notch 16 is formed from the front surface to the back surface of the transfer film 8, and the decorative layer 10 has a locally thin portion, The force required to shear is reduced. Further, the decorative layer 10 is easily cracked by an edge portion which is an acute corner portion at the tip of the first convex portion 15a. At this time, if the first convex portion 15a breaks the base film 9 of the transfer film 8, the air sucked from the second mold 2 leaks, so the height y of the first convex portion 15a is , Smaller than the thickness x of the decorative layer 10.

  In FIG. 2D, molten molding resin 17 is injected from the cylinder of the molding machine into a space surrounded by the transfer film 8 along the first mold 1 and the second mold 2. Thereafter, the mold is cooled in a clamped state to solidify the molding resin 17. The adhesive layer 11 of the transfer film 8 is melted by the temperature at the time of injection of the molding resin 17, and then the decorative layer 10 of the transfer film 8 is molded resin in the process of being cooled to the mold temperature of the second mold 2. The in-mold molded product 18 is in close contact with.

FIG. 2 (e) shows a state where mold opening has started.
The third mold 3 that has been retracted by clamping is pushed out toward the second mold 2 by a spring 5a installed between the mold 4 and the transfer film 8 is moved by the clearance that has been retracted during clamping. Hold down. Meanwhile, the in-mold molded product 18 moves away from the second mold 2. Thereafter, the second mold 2 moves to the mold opening completion position with respect to the first mold 1 as shown in FIG. 6, and the in-mold molded product 18 is taken out from the first mold 1.

FIGS. 4 and 5 show the course of the process from the state of FIG. 3 in which the mold clamping is completed to the completion of mold opening in FIG. 6 after the injection and cooling of the molding resin is completed.
In a state where the injection and cooling of the molding resin are completed, the filled molding resin 17 is cooled by the first mold 1 and is held to the first mold 1 by the contraction of the resin. Therefore, in the state of FIG. 4 in which the mold is slightly opened, since the base film 9 is sucked by the second mold 2, the mold is released between the decorative layer 10 and the base film 9. At that time, a tensile force is generated in the decorative layer 10, and by this force, a crack 19 is generated in the decorative layer 10 starting from the notch 16 in contact with the apex of the edge portion of the first convex portion 15 a. Furthermore, also from the point of cooling of the decoration layer 10, by providing the 3rd metal mold | die 3 with the 1st convex part 15a, compared with the case where the 3rd metal mold 3 does not have the 1st convex part 15a, it is decorated. Since the contact area between the layer 10 and the third mold 3 is increased, the decorative layer 10 can be more easily cooled, and the generation of cracks 19 is promoted.

In the state of FIG. 5 in which the mold is further opened, the crack 19 grows by opening the mold, and the decorative layer 10 is broken.
In FIG. 6 where the mold is fully opened, the third mold 3 is also moved simultaneously with the second mold 2 until the stroke amount z of the third mold 3 is opened during the process of opening the mold. Thereafter, only the second mold 2 is movable. That is, during the movement of the stroke z, the transfer film 8 is compressed and fixed by the flat surface 3 a of the third mold 3 and the flat surface of the second mold 2. In that case, since the 3rd metal mold | die 3 slides on the end surface of the decoration layer 10, external appearance quality may deteriorate. Therefore, the stroke amount z is
xy <z <0.5mm
It is desirable that

  As described above, since the first convex portion 15a is provided in the third mold 3, even when the thick transfer film 8 is provided with functionality, the starting point at which the decorative layer shears when the mold is opened. The crack 19 to be formed can be formed at the time of mold clamping, and an in-mold molded product without foil burrs or end face peeling can be obtained.

(Comparative example)
Here, as shown in FIG. 11, the case where the third mold 3 does not have the first convex portion 15a in FIG. 1B will be described as a comparative example. In addition, the same code | symbol is attached | subjected and demonstrated to the thing similar to Embodiment 1.

FIG. 11 shows a state in which the mold clamping is completed and the molding resin is injected, and the transfer film 8 is compressed and fixed by the flat surface 3a of the third mold 3 and the flat surface 2a of the second mold 2. Yes.
In the state where the mold is slightly opened from the state of FIG. 11 as shown in FIG. 12, the base film 9 before opening the mold is attached to the second mold 2 side by suction. When opened, the decorative layer 10 begins to peel from the base film 9.

  Since the molding resin 17 is embraced by the first mold 1 due to a mold release resistance due to shrinkage or a product shape constituted by the first mold 1, the molding resin 17 remains in the first mold even if the mold is opened. Remains on the 1 side. On the other hand, since the transfer film 8 is pressed against the second mold 2 by the third mold 3, it remains on the second mold 2 side.

Therefore, a force F that pulls the decorative layer 10 is generated in the decorative layer 10. The force F that pulls the decorative layer 10 is decomposed into a peeling force Fx that attempts to peel the decorative layer 10 from the molding resin 17 and a force Fy that causes the decorative layer 10 to shear. Here, when the adhesive force by the adhesive layer 11 is Fx ′ and the force required for the decorative layer 10 to shear is Fymax, in a state where the opening amount of the mold is small,
Fx <Fx ′, Fy <Fymax
Therefore, the decorative layer 10 is not peeled off from the molding resin 17 and the decorative layer 10 is not sheared.

FIG. 13 shows a state where the mold is further opened from the state of FIG.
The tensile force F increases as the mold opening amount increases, and the force direction changes from a direction perpendicular to the mold opening direction to the same direction as the mold opening direction. At this time, what is the force relationship between the peeling force Fx and the adhesive force Fx ′, the force Fy that causes the decorative layer 10 to shear, and the force Fymax that is necessary for the decorative layer 10 to shear. Thus, it is determined whether or not the decorative layer 10 is peeled off.

In the case of the transfer film 8 having no functionality, the decorative layer 10 is thin, so that the force Fymax required for the decorative layer 10 to shear is small. for that reason,
Fx <Fx ′, Fy> Fymax
Thus, the decorative layer 10 was cracked starting from the inner edge of the third mold 3, and an in-mold molded product without foil burrs could be obtained.

However, in the case of the thick transfer film 8 with added functionality, the decorative layer 10 is thick, so that the force Fymax required for the decorative layer 10 to shear is also increased. for that reason,
Fx> Fx ′, Fy <Fymax
As shown in FIG. 14, foil peeling occurred where the decorative layer 10 was peeled off from the molding resin 17, and a high-quality in-mold molded product could not be obtained.

(Embodiment 2)
FIG. 7 shows an in-mold injection mold according to Embodiment 2 of the present invention.
This Embodiment 2 has shown the case where the in-mold molded product in which the opening hole was formed is shape | molded. A convex product opening hole 30 is formed in the cavity surface 6 in the second mold 2 in order to form the opening hole. Corresponding to the product opening hole 30, the first mold 1 is formed with a recess 31 having a diameter larger than the diameter of the product opening hole 30 by the thickness of the opening hole. In the center of the recess 31 of the first mold 1, a nest 32 is provided in the first mold 1 so as to be slidable in the mold clamping direction. A spring 5 b is interposed between the insert 32 and the template 4. A V-shaped second convex portion 15b similar to the first convex portion 15a formed on the third mold 3 is provided at the tip of the insert 32 that presses the transfer film 8 against the product opening hole 30 in a mold-clamped state. Is formed. The rest is the same as in the first embodiment.

  With this configuration, in the clamped state where the first convex portion 15a of the third mold 3 bites into the decorative layer 10 of the transfer film 8, the second convex portion 15b of the first mold 1 is also subjected to the addition of the transfer film 8. Cut into the decorative layer 10. The height y in the mold opening direction of the second convex portion 15 b is smaller than the thickness x of the decorative layer 10.

  When the mold is opened, cracks can be formed on the product opening hole 30 of the transfer film 8 as a starting point for shearing of the decorative layer, and the transfer film 8 has a thickness that provides functionality. Even in the case of a film, it is possible to obtain a good in-mold molded product without foil burrs or end face peeling.

(Embodiment 3)
FIG. 8 shows a third embodiment of the present invention.
In FIG. 8, 33 is a cooling flow path as a mold temperature control circuit provided inside the insert 32.

The cooling channel 33 has an inlet 34 and an outlet 35 formed in the template 4, and the cooling medium flowing from the inlet 34 is the cooling channel 33 in the third mold 3 and the insert 32. Through the outlet 35 of the template 4. Even if the 3rd metal mold | die 3 and the insert 32 move, the cooling flow path 33 is materialized in the connection part of the cooling flow path 33 of the 3rd metal mold | die 3 and the insert 32 and the template 4. FIG. The first mold 1, the third mold 3, and the insert 32 are made of different materials, the thermal conductivity of the materials of the third mold 3 and the insert 32 is A, and the mold that forms the first mold 1 is used. When the thermal conductivity of the mold material is B,
A> B
The material becomes.

  As an example, the material of the third mold 3 and the insert 32 is copper (thermal conductivity at 20 ° C. is 372 W / (m · K)), and the mold material of the first mold 1 is carbon steel (heat at 20 ° C. When the conductivity is 53 W / (m · K)), a heat transfer effect that is approximately seven times that of the case where the third mold 3 and the insert 32 are made of carbon steel is obtained.

  Conventionally, the shape of a molded product used for an exterior of a display or the like is often a rectangular frame shape having an opening hole in the shape. Since the product opening hole 30 is configured at the center of the second mold 2 and the first mold 1, when the molding cycle is short, the mold is likely to store heat by continuous molding from the outer periphery of the product shape. The temperature of the product end surface portion of the opening hole 30 was higher than that of the other portions, and the product end surface portion of the product opening hole 30 was particularly susceptible to end face peeling. With this configuration, a portion where heat storage is likely to occur is a nested structure made of a material having good thermal conductivity, and the cooling flow path 33 is provided inside the nested 32, so that the temperature of the nested 32 itself can be reduced to a cooling medium. It is possible to prevent the occurrence of end face peeling, particularly the product opening hole 30 peeling.

  In this way, the surface of the transfer film 8 and the resin is cooled by the cooling medium flowing in from the cooling flow path 33, and the base film and the decorative layer are separated from the adhesive layer by the adhesive layer between the decorative layer and the resin. By realizing a state in which the force peeled off at the boundary is reduced, the occurrence of product end face peeling is prevented. Other structures and operations are the same as those in the first and second embodiments.

  In Embodiment 2 or 3 described above, the first convex portion 15a is provided in the third mold 3, and the second convex portion 15b is provided in the insert 32. However, the first convex portion 15a and the second convex portion 15b are not provided. Of these, the provision of the second convex portion 15b is more effective than in the prior art.

In each of the above embodiments, the first mold 1 is a fixed mold and the second mold 2 is a movable mold. However, the first mold 1 is a movable mold and the second mold. The same applies if the mold 2 is a fixed mold.
As described above, the present invention has been described by using the example of the embodiment, but there are many other specific structures that realize the gist of the present invention, and modifications are easy for those belonging to the industry, It does not depart from the invention.

  The present invention contributes to the production of various in-mold molded products to which functionality is imparted by a transfer film.

DESCRIPTION OF SYMBOLS 1 1st metal mold | die 2 2nd metal mold | die 2a Clamp surface of 2nd metal mold | die 3 3rd metal mold | die 4 Template 5a, 5b Spring 6 Cavity surface of 1st metal mold | die 1 8 Transfer film 9 Base film 10 Decoration Layer 11 Adhesive layer 12 Foil retainer plate 14 Suction channel 15a First projection 15b Second projection 16 Notch 17 Molded resin 18 In-mold molded product 19 Crack 30 Product opening hole 32 Nest 33 Cooling channel 34 Flow of cooling medium Inlet 35 Cooling medium discharge port F Force to pull the decorative layer Fx Peeling force to peel the decorative layer Fy Force to cause the decorative layer to shear x Thickness of the decorative layer y First convex portion 15a , Height of the second convex portion 15b z stroke of the third mold N force generated by the spring T force pressing the transfer film

Claims (9)

An in-mold that creates an in-mold molded product in which the surface of the molding resin is decorated with a decorative layer of the transfer film in a cavity formed by clamping the first mold and the second mold with the transfer film interposed therebetween In injection mold,
A foil pressing plate for pressing and clamping the transfer film against the clamping surface of the second mold,
A suction circuit for sucking the transfer film into the second mold between the cavity and the foil pressing plate;
It moves in the mold opening direction in conjunction with the mold clamping and mold opening, and clamps the transfer film between the foil pressing plate and the cavity against the clamping surface of the second mold in the mold clamping state. A third mold,
And a first convex portion that bites into the decorative layer of the transfer film in the clamped state along the contour of the cavity on the edge portion of the bottom surface of the third mold,
In-mold injection mold. Provided on the cavity surface of the second mold forming a part of the cavity a product opening hole formed to project toward the first mold side;
A cavity surface of the first mold that forms a part of the cavity is provided corresponding to the product opening hole, and a nest is provided in which the tip is in contact with the product opening hole in a clamped state.
In the edge portion of the tip of the insert corresponding to the product opening hole portion, a second convex portion that bites into the decorative layer of the transfer film in the clamped state is provided,
The in-mold injection mold according to claim 1. An in-mold that creates an in-mold molded product in which the surface of the molding resin is decorated with a decorative layer of the transfer film in a cavity formed by clamping the first mold and the second mold with the transfer film interposed therebetween In injection mold,
A foil pressing plate for pressing and clamping the transfer film against the clamping surface of the second mold,
A suction circuit for sucking the transfer film into the second mold between the cavity and the foil pressing plate;
It moves in the mold opening direction in conjunction with the mold clamping and mold opening, and clamps the transfer film between the foil pressing plate and the cavity against the clamping surface of the second mold in the mold clamping state. A third mold,
A product opening hole formed on the cavity surface of the second mold forming a part of the cavity and projecting toward the first mold;
And providing
Provided on the cavity surface of the first mold that forms a part of the cavity corresponding to the product opening hole portion, provided a nesting that the tip is abutted against the product opening hole portion in a clamped state,
A second convex portion that bites into the decorative layer of the transfer film in the clamped state is provided at the edge portion of the product opening hole at the tip of the insert.
In-mold injection mold. The height of the first convex part is smaller than the thickness of the decorative layer,
The in-mold injection mold according to claim 1 or 3. The thermal conductivity of the nesting is greater than the thermal conductivity of the second mold,
The in-mold injection mold according to claim 1 or 3. An in-mold that creates an in-mold molded product in which the surface of the molding resin is decorated with a decorative layer of the transfer film in a cavity formed by clamping the first mold and the second mold with the transfer film interposed therebetween In the injection molding method,
In the clamped state, the edge portion near the second mold of the third mold that is located on the outer peripheral portion of the first mold and forms the cavity together with the first mold and the second mold, The first convex portion formed along the contour of the cavity is bitten into the decorative layer of the transfer film, and a portion having a small force necessary for shearing the decorative layer is formed on the transfer film,
Injecting a molding resin into the cavity, melting the adhesive layer of the transfer film at the temperature of the molding resin, and then cooling to adhere the decorative layer to the molding resin,
With the mold opening while sucking the transfer film to the second mold, after generating a crack starting from the notch formed by the first convex portion that bite into the decorative layer, Breaking the decorative layer starting from the crack part,
In-mold injection molding method. The height of the first convex part is smaller than the thickness of the decorative layer,
The in-mold injection molding method according to claim 6. An in-mold that creates an in-mold molded product in which the surface of the molding resin is decorated with a decorative layer of the transfer film in a cavity formed by clamping the first mold and the second mold with the transfer film interposed therebetween In the injection molding method,
In the clamped state,
Forming a part of the cavity on a cavity surface of the second mold that forms a part of the cavity corresponding to a product opening hole formed projecting toward the first mold side; The front end of the nest located on the cavity surface of the first mold is placed in contact with the product opening hole, and the second convex portion formed on the edge portion of the front end of the nest is cut into the decorative layer. Letting the transfer film form a small portion of the force required to shear the decorative layer,
Injecting a molding resin into the cavity, melting the adhesive layer of the transfer film at the temperature of the molding resin, and then cooling to adhere the decorative layer to the molding resin,
With the mold opening while sucking the transfer film to the second mold, after generating a crack starting from the notch formed by the first convex portion that bite into the decorative layer, Breaking the decorative layer starting from the crack part,
In-mold injection molding method. The height of the second convex portion is smaller than the thickness of the decorative layer,
The in-mold injection molding method according to claim 8.