JPH10100204A - Mold for in-mold decorating simultameously with molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an in-mold decorated product having a good appearance which is free from generation of wrinkles by a method wherein a parting face from a suction hole provided inside from a position against which a clamp component clamping an inmold decoration film of the parting face of a movable mold abuts to a cavity recessed part is made a finely irregular face. SOLUTION: A movable mold 1 has a cavity recessed part injecting molten resin, a parting face 3 against which a clamp component 8 clamping an inmold decoration film 7 arranged thereon abuts, and a suction hole 4 for sucking the in-mold decoration film 7. The suction hole 4 is positioned inside from a position against which the clamp component 8 of the parting face 3 abuts, and the parting face 3 from the suction hole 4 to the cavity recessed part is formed in a finely irregular face 5. Since a state wherein a fine clearance is formed between the in-mold decoration film 7 and the finely irregular 5 is obtained thereby when the film 7 is sucked, partial inferiority in adhesion of the in-mold decoration film 7 onto an inner face of the cavity recessed part 6 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for simultaneous molding and painting, which is used for bonding a painting film at the same time as molding an injection-molded product. It is possible to obtain a simultaneously molded article which does not occur.

[0002]

2. Description of the Related Art Heretofore, there have been the following methods for obtaining a simultaneously molded article in which a painting film is adhered to an injection molded article. First, a mold A having a cavity recess into which a molten resin is injected, a suction hole (including a suction groove) formed on the inner surface of the cavity recess for sucking the painting film, and a mold A A mold for simultaneous molding and painting comprising a mold B having an injection port for injecting the molten resin into the cavity concave portion in the mold closed state, and a painting film are prepared. Next, a painting film is inserted between the mold A and the mold B, and the painting film disposed on the cavity recess is clamped by the clamp member. Next, the paint film is sucked through the suction hole to make the painting film adhere to the inner surface of the cavity concave portion. Next, the mold A and the mold B are closed, the molten resin is injected into the cavity concave portion from the injection port of the mold B, and a painting film is adhered to the surface of the injection molded product. Get.

[0003]

However, hitherto, only a simultaneously molded article having poor appearance has been obtained. That is, since the suction hole for sucking the painting film is formed in the inner surface of the cavity concave portion, a trace of the suction hole is formed on the surface of the finished simultaneously formed painted product. If the suction hole is made smaller to reduce the trace, the appearance will be slightly better, but the trace of the suction hole will remain as it is, so it is not a means that can basically solve the problem, the painting film adheres to the entire inner surface of the cavity recess before,
Another problem is that the suction holes are blocked by the painting film, and the wrinkled painting film adheres to the surface of the injection molded product.

[0004]

According to the present invention, there is provided a simultaneous-painting mold comprising: a cavity recess into which a molten resin is injected; and a painting film disposed on the cavity recess. A movable mold having a parting surface with which a clamp member to be clamped abuts and a suction hole for sucking a painting film, and a fixed having an injection port for injecting a molten resin into a cavity recess when the movable mold is closed. In the mold for simultaneous simultaneous painting consisting of a mold and
The movable parting surface has a suction hole inside the position where the clamp member abuts, and at least the parting surface from the suction hole to the cavity recess is a fine uneven surface.

[0005] The simultaneous molding and painting mold of the present invention comprises a cavity recess into which a molten resin is injected, a parting surface on which a clamping member for clamping the painting film disposed on the cavity recess abuts, And a movable mold having a runner portion serving as a molten resin passage from the injection port to the cavity concave portion. The fixed parting surface has a suction hole inside the position where the clamp member abuts, and at least the parting surface from the suction hole to the cavity concave portion is a fine uneven surface.

In the present invention, the fine uneven surface may be a surface formed by etching.

In the present invention, the fine uneven surface may be an aggregated surface of the dot-shaped convex portions.

In the present invention, the fine uneven surface may be formed on the entire periphery of the cavity concave portion.

In the present invention, the plurality of suction holes may be connected by a groove surrounding the cavity recess, and the parting surface from the groove to the cavity recess may be a fine uneven surface.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings.

The mold for simultaneous simultaneous painting according to the present invention includes a movable mold 1 and a fixed mold 2, and a parting surface 3 of the movable mold 1 has a suction hole 4 and a fine uneven surface 5 (see FIG. 1). 1 to 3, 5 to 7).

The movable mold 1 includes a cavity recess 6 into which a molten resin is injected, a parting surface 3 on which a clamping member 8 for clamping a painting film 7 disposed on the cavity recess 6 abuts, and a painting film 7. This is a mold having a suction hole 4 for sucking the gas. The suction hole 4 is connected to a suction path 20 formed in the mold. The movable mold 1 has a suction hole 4 inside the part of the parting surface 3 where the clamp member 8 contacts, and at least the parting surface 3 from the suction hole 4 to the cavity concave portion 6 has a fine uneven surface 5.
It is. The fine uneven surface 5 may be a surface formed by an etching process for melting the mold surface chemically or an NC process for mechanically shaving the surface. The NC processing is performed by a numerically controlled grinding machine, a numerically controlled planing machine, or the like. The concave part of the fine unevenness is
Innumerable fine grooves 9 may be formed to extend radially from the cavity concave portion 6 (FIG. 3B). Fine groove 9
Has a length of 1 mm to 2 mm. The fine uneven surface 5 may be an aggregate surface of the dot-shaped convex portions 21 (FIG. 3A).
It is preferable that the interval between the adjacent dot-shaped protrusions 21 of the fine uneven surface 5 is 1 μm to 100 μm on average, and the height of the dot-shaped protrusions 21 is 10 μm to 50 μm on average. The fine uneven surface 5 may be formed on a part of the edge of the cavity concave portion 6 of the movable mold 1 or may be formed on the entire periphery of the edge of the cavity concave portion 6 of the movable mold 1. It is advantageous to form the fine uneven surface 5 on the entire periphery of the edge because the painting film 7 is evenly adhered to the inner surface of the cavity concave portion 6. The movable mold 1 is
A plurality of suction holes 4 are formed in a groove 10 surrounding the cavity recess 6, and the parting surface 3 from the groove 10 to the cavity recess 6 may be a fine uneven surface 5 (FIG. 3B )). The clamp member 8 may be a member that sequentially clamps the painting film 7 to the parting surface 3 so as to surround the cavity recess 6 with a plurality of clamp member pieces separated from the frame-shaped clamp member. A shield member 11 made of rubber or the like may be formed at a portion where the clamp member 8 abuts (FIG. 2). The cavity recess 6 may be formed at two or more locations (FIG. 6).

The fixed mold 2 has an injection port for injecting the molten resin into the cavity concave portion 6 when the movable mold 1 and the movable mold 1 are closed. The fixed mold 2 may have a concave portion 15 in which the clamp member 8 is housed when the movable mold 1 is closed with the mold.

The mold for simultaneous simultaneous painting according to the present invention includes a movable mold 1 and a fixed mold 2, and a parting surface 3 of the fixed mold 2 has a suction hole 4 and a fine uneven surface 5 (see FIG. 1). 3 and 4).

The fixed mold 2 has a cavity recess 6 into which the molten resin is injected, a parting surface 3 on which a clamping member 8 for clamping a painting film 7 disposed on the cavity recess 6 abuts, and a painting film 7. This is a mold having a suction hole 4 for sucking the resin and an injection port 12 for the molten resin. The fixed mold 2 has a suction hole 4 inside the position where the clamp member 8 of the parting surface 3 contacts, and at least the parting surface 3 from the suction hole 4 to the cavity recess 6 is a fine uneven surface 5. . The fine uneven surface 5 may be a surface formed by an etching process for melting the mold surface chemically or an NC process for mechanically shaving the surface. The NC processing is performed by a numerically controlled grinding machine, a numerically controlled planing machine, or the like.
In the concaves of the fine irregularities, countless fine grooves 9 are formed in the cavity concaves 6.
(See FIG. 3).
(B)). The length of the fine groove 9 is 1 mm to 2 mm. The fine uneven surface 5 may be an aggregate surface of the dot-shaped convex portions 21 (FIG. 3A). It is preferable that the interval between the adjacent dot-shaped protrusions 21 of the fine uneven surface 5 is 1 μm to 100 μm on average, and the height of the dot-shaped protrusions 21 is 10 μm to 50 μm on average. The fine uneven surface 5 may be formed on a part of the edge of the cavity concave portion 6 of the movable mold 1 or may be formed on the entire periphery of the cavity concave portion 6 of the fixed mold 2. It is advantageous to form the fine uneven surface 5 on the entire periphery of the edge because the painting film 7 is evenly adhered to the inner surface of the cavity concave portion 6. The fixed mold 2 has a plurality of suction holes 4 formed in the cavity recesses 6.
And the parting surface 3 extending from the groove 10 to the cavity concave portion 6 may be the fine uneven surface 5. The clamp member 8 may be a member that sequentially clamps the painting film 7 to the parting surface 3 so as to surround the cavity recess 6 with a plurality of clamp member pieces separated from the frame-shaped clamp member. A shield member 11 made of rubber or the like may be formed at a portion where the clamp member 8 contacts. The cavity recess 6 may be formed in two or more places (FIG. 4).

The movable mold 1 has a runner portion 14 serving as a molten resin passage from the injection port 12 to the cavity recess 6. The movable mold 1 may have a fixed pin 13. The fixing pin 13 presses and fixes the painting film 7 to the fixed mold 2 in the vicinity of the injection port 12 of the fixed mold 2 when the mold is closed with the fixed mold 2. , So as to easily enter the runner portion 14. The movable mold 1 has a recess 15 in which the clamp member 8 is housed when the mold is closed with the fixed mold 2.
May be provided.

The metal mold of the present invention may be provided with a painting film feeding device for feeding the painting film 7 to the front surface of the cavity recess 6. The painting film feeding device may be attached to either the movable mold 1 or the fixed mold 2. The painting film feeding device includes a feeding device 16 and a winding device 17, and includes a movable mold 1 or a fixed mold 2.
And the take-up device 17 below the movable die 1 or the fixed die 2. The painting film feeding device may be composed of a feeding device 16 and a film introducing means, and may be a device which grasps the divided end portion 18 of the painting film 7 and draws it between the movable mold 1 and the fixed mold 2. The painting film 7 is delivered from the film introduction means to the mold on which the suction hole 4 is provided, and the clamping member 8 is provided.
May be provided with a preliminary clamping member 19 for gripping and fixing the divided end portion 18 of the painting film 7 before clamping with.

In the mold of the present invention, a fine uneven surface 5 may be formed on the entire or part of the parting surface 3 of the mold on which the suction hole 4 is not provided (FIG. 7). Fine uneven surface 5
Since the depth and width of the irregularities are extremely smaller than the thickness of the painting film 7, the movable mold 1 and the fixed mold 2 are closed, and the parting surface 3 of the movable mold 1 and the parting surface of the fixed mold 2 are closed. 3 is in close contact with the painting film 7, even if there is a gap between the parting surface 3 on which the suction hole 4 is not provided and the painting film 7, air can enter. A gap is not formed so that the molten resin can enter. Parting surface 3 of the mold on the side not provided with suction hole 4
If the fine uneven surface 5 is provided, a gap is created between the painting film 7 and the parting surface 3 even after closing the mold. Although the molten resin does not flow out due to the gap, the air compressed by the injection pressure of the molten resin can be exhausted outside the mold through the gap. This is advantageous because air bubbles are less likely to be mixed or chipped in the injection molded article.

The painting film 7 used at the time of using the mold for simultaneous simultaneous painting of the present invention has a picture layer on a long base film. There are insert films in which the base film is not peeled off from the picture layer after injection molding, and transfer films in which the base film is peeled off from the picture layer after injection molding.

The present invention has the following operation. (1) Since the parting surface has the suction holes 4, the suction holes 4 do not contact the surface of the simultaneously painted product. (2) Since the depth and width of the unevenness of the fine unevenness surface 5 are extremely small as compared with the thickness of the painting film 7, even if the painting film 7 is sucked, the finely unevenness of the painting film 7 remains on the parting surface. The surface 5 is not completely closed, and a fine gap is formed between the painting film 7 and the fine uneven surface 5. When all or most of the fine recesses are connected, air flows in the fine uneven surface 5 in all directions other than the cavity recess 6 direction. Therefore, the air in the cavity 6 reaches one of the suction holes 4 without fail. Multiple suction holes 4
Even if the periphery of some of the suction holes 4 is closed by the painting film 7, air is guided to the other suction holes 4 by the fine uneven surface 5. (3) When the fine uneven surface 5 is formed on the entire periphery of the edge of the opening of the cavity 6, suction can be performed from the entire periphery of the cavity 6, and the painting film 7 can be applied to the inner surface of the cavity 6. The partial poor adhesion is eliminated. Even if the periphery of a part of the plurality of suction holes 4 is closed by the painting film 7, air is guided to the other suction holes 4 by the fine uneven surface 5. The air sucked from the entire periphery of the edge of the cavity 6 can also be sucked from the entire periphery of the cavity concave portion 6.

[0021]

According to the simultaneous-molding mold of the present invention, since the suction hole of the painting film is formed on the parting surface and it is not necessary to form the suction hole on the inner surface of the cavity concave portion, the finished molding is completed. No trace of the suction hole is left on the surface of the painting film of the simultaneous painting. Also, the depth and width of the unevenness of the fine uneven surface of the parting surface is extremely small compared to the thickness of the painting film, so the painting film is sucked by the suction hole, and the painting film adheres to the parting surface Also, since fine gaps are formed between the fine irregularities and the fine irregularities, suction can be performed evenly, and the wrinkled painting film does not adhere to the surface of the injection molded product. Therefore, according to the present invention, it is possible to obtain a molded simultaneous painted article having a good appearance.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a simultaneous painting tool according to the present invention. For convenience, the painting film is transparent.

FIG. 2 is a cross-sectional view of the simultaneous-painting mold of the present invention.

FIG. 3 is a perspective view of an essential part of a simultaneous molding and painting mold of the present invention.

FIG. 4 is a cross-sectional view of a simultaneous molding and painting mold of the present invention having a fine uneven surface on a parting surface of a fixed mold.

FIG. 5 is a front view showing an embodiment of a simultaneous-painting mold of the present invention having a groove.

FIG. 6 is a cross-sectional view of the simultaneous molding and painting mold of the present invention having a plurality of cavity recesses.

FIG. 7 is a cross-sectional view of a simultaneous molding and painting mold of the present invention having fine irregularities on both parting surfaces of a movable mold and a fixed mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable type 2 Fixed type 3 Parting surface 4 Suction hole 5 Fine uneven surface 6 Cavity recess 7 Painting film 8 Clamp member 9 Fine groove 10 Groove 11 Shield member 12 Injection port 13 Fixing pin 14 Runner part 15 Concave part 16 Feeding device 17 Take-up device 18 Split end 19 Preliminary clamp member 20 Suction path

Claims (6)

[Claims] A cavity recess into which the molten resin is injected, a parting surface on which a clamp member for clamping a painting film disposed on the cavity recess abuts;
In a molding simultaneous painting mold comprising a movable mold having a suction hole for sucking a painting film, and a fixed mold having an injection port for injecting a molten resin into a cavity recess in a mold closed state with the movable mold. Wherein the movable parting surface has a suction hole inside the position where the clamp member abuts, and at least the parting surface from the suction hole to the cavity concave portion is a fine uneven surface, wherein simultaneous molding is performed. Mounting mold. 2. A cavity recess into which the molten resin is injected, a parting surface on which a clamping member for clamping a painting film disposed on the cavity recess abuts,
For simultaneous simultaneous painting, consisting of a fixed mold having a suction hole for sucking a painting film and an injection port for molten resin, and a movable mold having a runner portion that serves as a molten resin passage from the injection port to the cavity recess. In the mold, the fixed parting surface has a suction hole inside the position where the clamp member abuts, and at least the parting surface from the suction hole to the cavity recess is a fine uneven surface. Mold for simultaneous painting. 3. The mold for simultaneous simultaneous painting according to claim 1, wherein the fine uneven surface is a surface formed by etching. 4. The mold for simultaneous molding and painting according to claim 1, wherein the fine uneven surface is a collective surface of the dot-shaped convex portions. 5. The mold for simultaneous simultaneous painting according to claim 1, wherein the fine uneven surface is formed all around the edge of the cavity concave portion. 6. A plurality of suction holes are connected by a groove surrounding the cavity recess, and a parting surface from the groove to the cavity recess is a fine uneven surface.
The mold for simultaneous simultaneous painting according to any one of the above.