JP2020142396A - Mold - Google Patents

Abstract

To provide a mold capable of reducing pressing force applied to an end face of a sensor film by fluid resin.SOLUTION: A mold 80 of this invention comprises: a first die (fixed die 82) including a runner R and a cavity C that are filled with molten resin; a second die (movable die 86) in which a fixed part (a body fixed part 86AB and a drawer part fixed part 86AC) is formed in a facing surface facing the cavity C, the fixed part capable of fixing a sensor film 12 including wiring; and a wall-shaped protrusion 88 formed along an outer periphery of the fixed part and disposed in a position sandwiched between the fixed part and the runner R in a state in which the first die and second die are mold-closed.SELECTED DRAWING: Figure 2

Description

The present invention relates to a mold.

Patent Document 1 below describes a method for manufacturing a molded product in which a sensor film on which an electrode wiring layer is formed is arranged along an injection molding mold surface, and resin is injected into a cavity.

JP-A-2017-56624

In the method for manufacturing a molded product described in Patent Document 1, the fluid resin injected into the cavity presses the end face of the sensor film. Therefore, a shearing force may act on the electrode wiring of the sensor film to break the sensor film.

In consideration of the above facts, an object of the present invention is to provide a mold capable of reducing the pressing force acting on the end face of the sensor film from the fluidized resin.

The mold according to the first aspect of the present invention is a first mold provided with a runner and a cavity filled with resin, and a sensor film provided with wiring can be fixed to a facing surface facing the cavity. The second mold in which the portion is formed and the second mold formed along the outer periphery of the fixed portion, and the first mold and the second mold are placed in a position sandwiched between the fixed portion and the runner in a closed state. It is equipped with a wall-shaped protrusion that is formed.

In the mold according to the present invention according to claim 1, the sensor film can be fixed to the fixing portion of the second mold. A wall-shaped protrusion is formed on the outer circumference of the fixed portion, and this protrusion is arranged at a position sandwiched between the fixed portion and the runner of the first mold when the first mold and the second mold are closed. To.

When the resin is injected from the runner into the cavity, the resin flows toward the sensor film. Since a wall-shaped protrusion is arranged between the sensor film and the runner, this protrusion serves as a protective wall, and direct pressing of the end face of the sensor film by the fluidized resin is suppressed. As a result, the pressing force acting on the end face of the sensor film from the fluidized resin can be reduced.

The mold according to the present invention according to claim 2 is the mold according to claim 1, in which the fixing portion is in a state where the first mold and the second mold in a closed state are viewed from the front. A first fixing portion located inside the cavity and a second fixing portion capable of arranging the sensor film between the first fixing portion and the first mold protruding along the in-plane direction. The protrusion is formed along the outer periphery of the boundary between the first fixing portion and the second fixing portion.

According to the mold according to the present invention according to claim 2, a portion of the sensor film that projects outward of the cavity is arranged between the first mold and the second mold. When the resin is injected from the runner into the cavity, the end face of the portion of the sensor film located inside the cavity (that is, the portion fixed to the first fixing portion) is pressed by the fluidized resin. On the other hand, the portion located outside the cavity (that is, the portion fixed to the second fixing portion) is not pressed. Therefore, a shearing force acts on these boundaries.

Here, since a wall-shaped protrusion is arranged between the boundary portion and the runner, this protrusion serves as a protective wall, and the pressing of the boundary portion by the fluidized resin is suppressed. As a result, it is possible to prevent the shearing force acting on the boundary between the portion pressed by the fluidized resin and the portion not pressed by the fluidized resin from being increased by the fluidized resin.

The mold according to the present invention according to claim 3 is the mold according to claim 1 or 2, wherein the cavity has a curved surface, and the protrusion has the first mold and the second mold. It is arranged over the outer periphery of the fixed portion in a closed state.

According to the mold according to claim 3, the cavity has a curved surface. Therefore, the flow path of the resin injected into the cavity becomes complicated as compared with the case where the curved surface is not provided. For example, the resin may flow from the wall surface of the cavity opposite to the runner toward the center of the cavity.

However, in the mold according to claim 3, the protrusions are arranged over the outer periphery of the fixed portion. Therefore, even if the flow path of the resin is complicated, it is possible to prevent the flow resin from directly pressing the sensor film.

The mold according to the present invention according to claim 4 is the mold according to any one of claims 1 to 3, and the second mold has an exhaust hole formed adjacent to the protrusion. Has been done.

According to the mold according to claim 4, an exhaust hole is formed adjacent to the protrusion. Therefore, the high temperature gas generated during injection molding is discharged to the outside of the mold from the exhaust port. As a result, it is possible to suppress the exposure of the sensor film to the high temperature gas and suppress the distortion of the sensor film.

According to the mold according to the present invention, it has an excellent effect that the pressure acting on the end face of the sensor film from the fluidized resin can be reduced.

It is a perspective view of the resin molded article manufactured by using the mold which concerns on embodiment of this invention. (A) is a front view showing a front view of a fixed parting surface of the mold according to the embodiment of the present invention, and (B) is a front view showing a front view of a movable parting surface. It is a figure. (A) is a sectional view taken along line AA of FIG. 2 (A) in a state where the fixed mold and the movable mold are closed, FIG. 2 (B) is a sectional view taken along line BB, and FIG. It is a C line sectional view. (A) is a cross-sectional view showing a state in which a sensor film is fixed to a mold according to an embodiment of the present invention and the mold is closed, and (B) is a cavity filled with molten resin formed by closing the mold. It is sectional drawing which shows the state which is doing, (C) is the sectional view which shows the state which the molten resin is in contact with a movable protrusion. (A) is a front view showing a state in which the movable parting surface is viewed from the front in a modified example in which the shape of the protrusion of the mold according to the embodiment of the present invention is changed, and (B) is a front view showing a state in which the shape of the protrusion is changed. It is a perspective view of the resin molded product formed by using the die. (A) is a front view showing a state in which the movable parting surface is viewed from the front in another modified example in which the shape of the protrusion of the mold according to the embodiment of the present invention is changed, and (B) is a fixed mold. It is sectional drawing which shows the state which deformed the shape of the cavity part of the above, (C) is the perspective view of the resin molded article formed by using the mold which deformed the shape of a protrusion and a cavity part. It is sectional drawing which shows the state which arranged the decorative layer in the mold in the modified example which provided the decorative layer on the surface of the coating resin layer in the resin molded product manufactured by using the mold which concerns on embodiment of this invention. .. (A) is a front view of a fixed type showing a modification in which an exhaust hole is provided adjacent to a protrusion of a mold according to an embodiment of the present invention, and (B) is a fixed type and a movable type of (A). It is a cross-sectional view taken along the line BB in a state where the mold is closed, and (C) is an enlarged cross-sectional view of a group member forming a protrusion. It is a perspective view which shows the assembly structure of the assembly member and the movable die in the modified example which provided the exhaust hole adjacent to the protrusion of the mold which concerns on embodiment of this invention.

Hereinafter, the mold and the resin molded product according to the embodiment of the present invention will be described with reference to the drawings. The components shown by using the same reference numerals in each drawing mean that they are the same components. The description of overlapping configurations and symbols in the drawings may be omitted. Further, the present invention is not limited to the following embodiments, and can be carried out with appropriate modifications within the scope of the object of the present invention.

(Resin molded product)
FIG. 1 shows a resin molded product 10 manufactured by using the mold according to the embodiment of the present invention. The resin molded product 10 is a capacitance type touch panel. The resin molded product 10 is formed by including the sensor film 12 and the resin covering material 40.

In the resin molded product 10, the surface side of the covering material 40 (the side indicated by the arrow OUT in FIG. 1) is the operation surface (contact surface of the fingers). In the following description, with respect to the resin molded product 10 and each component forming the resin molded product 10, the arrow OUT side in FIG. 1 is referred to as the front side, the arrow OUT side surface is referred to as the front surface, and the arrow IN side is referred to as the back side. The surface on the IN side of the arrow may be referred to as the back surface.

The resin molded product 10 is formed by integrally molding the covering material 40 and the sensor film 12 (main body portion 12A and drawer portion 12B) with an injection molding die 80 described later.

(Sensor film)
The sensor film 12 is a sheet-like member made of PET (polyethylene terephthalate) resin, cycloolefin polymer (COP) resin, PC (polycarbonate) resin, or the like.

The sensor film 12 and the covering material 40 are adhered to each other with an undercoat agent, a binder agent, or the like. By applying plasma treatment or corona treatment to the surfaces of the sensor film 12 and the electrical wiring 60 described later, it is possible to improve the "wetting property" when a hydrophobic resin such as PET or COP is used as the base film 20. As a result, a stable adhesive layer can be obtained, so that the sensor film 12 and the covering material 40 can be tightly bonded.

The sensor film 12 includes a main body portion 12A and a drawer portion 12B. The main body portion 12A is a portion arranged inside the covering material 40 when viewed from the thickness direction of the covering material 40. Electrical wiring (not shown) is formed on the front side and the back side of the main body portion 12A. This electric wiring is formed by an electrode for a touch panel and a signal wiring that transmits an electric signal input from the electrode to the outside.

The drawer portion 12B is a portion arranged so as to project outward in the in-plane direction of the covering material 40 from one end edge of the main body portion 12A. In the drawer portion 12B, the portion covered with the covering material 40 (the portion connected to the main body portion 12A) and shown by hatching in FIG. 1 is referred to as a boundary portion 12AB.

Drawer wiring (not shown) is formed on the front side and the back side of the drawer portion 12B. Further, the electrical wiring (signal wiring) in the main body 12A and the lead wiring in the lead 12B are continuously formed.

The electrical wiring and the lead wiring are formed by using a copper wire, a silver wire, or the like. As an example, this copper wire is formed by adhering a copper foil to the sensor film 12 and further etching it. As a method for forming the copper wire, in addition to the method of adhering the copper foil, various methods such as copper sputtering and vapor deposition can be adopted. The same applies to silver wire.

(Covering material)
The covering material 40 is formed by injecting molten resin into the cavity C (see FIG. 3) of the injection molding die 80 described later. In the covering material 40, a gate cutting portion 40C is formed at a cutting portion between the runner resin 40R and the spool resin 40S, which will be described later.

The gate cutting portion 40C may be appropriately treated (for example, cutting burrs) so that the difference from the other portion of the covering material 40 is not visible. Further, in FIG. 1, the runner resin 40R and the spool resin 40S are shown, but the runner resin 40R and the spool resin 40S are not included in the resin molded product 10.

A groove 40V1 is formed in the covering material 40 along the outer circumference of the sensor film 12. Specifically, a groove 40V1 is formed between the boundary portion 12AB and the gate cutting portion 40C.

(Mold for injection molding)
FIG. 2 (A) shows a fixed mold 82 for forming an injection molding mold 80 (hereinafter referred to as a mold 80) for manufacturing the resin molded product 10, and FIG. 2 (B) shows. Indicates a movable type 86 that can move in the direction of contact and separation with respect to the fixed type 82. FIG. 2A shows a state in which the parting surface 82A of the fixed type 82 is viewed from the front, and FIG. 2B shows a state in which the parting surface 86A of the movable type 86 is viewed from the front. There is. The fixed type 82 is an example of the first type in the present invention, and the movable type 86 is an example of the second type in the present invention.

Further, FIGS. 3A to 3C show a state in which the fixed mold 82 and the movable mold 86 are closed by sandwiching the sensor film 12. In these FIGS. 3 (A), (B), and (C), the cross sections corresponding to the lines AA, BB, and CC shown in FIGS. 2 (A) and 2 (B), respectively. The figure is shown.

(Fixed type)
As shown in FIGS. 2A and 3A to 3C, a cavity portion 84 recessed in a direction away from the movable mold 86 is formed on the parting surface 82A of the fixed mold 82. A runner R that supplies the molten resin supplied from the spool S to the cavity C is connected to the cavity portion 84. The cavity C and the runner R are spaces formed by closing the fixed mold 82 and the movable mold 86. The cavity portion 84 refers to the bottom surface or the wall surface of the recess. The boundary between the cavity C and the runner R is referred to as a gate. The gate may have a small cross section with respect to the runner R.

As shown in FIGS. 2A and 3A, a fixing groove 84F having one end opened in the cavity portion 84 is formed on the parting surface 82A of the fixed mold 82. The fixing groove 84F is a groove for arranging the drawer portion 12B in the sensor film 12, and as shown in FIG. 2A, is along the in-plane direction of the parting surface 82A from one edge of the cavity portion 84. It is protruding. Further, as shown in FIG. 3A, the depth of the fixing groove 84F is equal to the thickness of the sensor film 12 assembled to the mold 80, or the volume expands to the thickness of the sensor film 12 due to the temperature rise. It is said that the depth is expected to increase the thickness (gap to the extent that burrs do not occur).

(Movable type)
As shown in FIG. 2B, a fixing surface (main body fixing portion 86AB) for fixing the main body portion 12A (see FIG. 1) of the sensor film 12 is formed on the parting surface 86A of the movable type 86.

The main body fixing portion 86AB is an example of the first fixing portion in the present invention, and the inner portion of the cavity portion 84 shown by the broken line in FIG. 2 (B) (the fixed mold 82 and the movable mold 86 are parted in a closed state). It is formed on the inner portion) when the surface 86A is viewed from the front.

Further, the parting surface 86A is formed with a fixed surface (drawing portion fixing portion 86AC) for fixing the drawing portion 12B (see FIG. 1) of the sensor film 12.

The drawer portion fixing portion 86AC is an example of the second fixing portion in the present invention, and is formed in a portion protruding outward from the cavity portion 84 along the in-plane direction of the parting surface 86A from the main body fixing portion 86AB. Further, as shown in FIG. 3A, the drawer portion fixing portion 86AC is a portion facing the fixing groove 84F in the fixed mold, and the drawer portion 12B of the sensor film 12 is sandwiched between the fixing groove 84F. Be placed.

As shown in FIG. 2B, in the drawer fixing portion 86AC, the inner portion of the cavity portion 84 (the connecting portion with the main body fixing portion 86AB), which is shown by hatching in FIG. 2B, is shown. , Boundary 86ABC.

On the parting surface 86A of the movable type 86, a protrusion 88 is formed on the surface facing the cavity portion 84 (the range surrounded by the cavity portion 84 shown by the dotted line). The protrusion 88 may be formed integrally with the metal constituting the movable mold 86, or may be formed as a separate member from the movable mold 86 and assembled later.

The protrusion 88 is formed in a wall shape along the outer circumference of the boundary portion 86ABC. Specifically, the protrusion 88 is formed on the outer periphery of the boundary portion 86ABC at a position sandwiched between the boundary portion 86ABC and the runner R when the mold is closed with the fixed mold 82. As shown in FIGS. 3A to 3C, the height of the protrusion 88 (the height from the parting surface 86A) is set to be equal to or higher than the height of the sensor film 12.

(Manufacturing method of resin molded products)
In order to manufacture the resin molded product 10, first, as shown in FIG. 4A, the sensor film 12 is installed on the movable mold 86 in the mold 80, and the fixed mold 82 and the movable mold 86 are closed. In the closed state, as shown in FIG. 3A, the drawer portion 12B of the sensor film 12 is arranged so as to be sandwiched between the fixed mold 82 (fixed groove 84F) and the movable mold 86 (drawing portion fixing portion 86AC). Will be done. Further, the main body portion 12A of the sensor film 12 is arranged in contact with the main body fixing portion 86AB of the movable type 86.

Next, as shown in FIG. 4B, the molten resin is injected from the spool S into the runner R, and the cavity C is filled with the molten resin. At this time, the molten resin is filled in the cavity C in order from the portion closer to the runner R.

As shown in FIG. 4C, the molten resin is blocked by the protrusion 88 on the upstream side (runner R side) of the boundary portion 12AB in the sensor film 12. In other words, the molten resin comes into contact with the protrusion 88 and changes the flow direction. As a result, the end face of the boundary portion 12AB in the sensor film 12 is suppressed from being exposed to the flow pressure of the molten resin.

After the molten resin is filled in the cavity C and the molten resin is solidified, when the fixed mold 82 and the movable mold 86 are opened, the sensor film 12, the covering material 40, the runner resin 40R, and the spool resin 40S are integrated into a resin molding. Goods are obtained. As shown in FIG. 1, by cutting the runner resin 40R and the spool resin 40S from this resin molded product (that is, cutting at the gate portion which is the boundary between the resin molded product and the runner resin 40R), FIG. The resin molded product 10 shown is obtained.

(Action / effect)
In the mold 80 according to the embodiment of the present invention, as shown in FIG. 2B, the sensor film 12 can be fixed to the parting surface 86A (main body fixing portion 86AB and drawer portion fixing portion 86AC) of the movable mold 86. A wall-shaped protrusion 88 is formed on the outer periphery of the boundary portion 86ABC on the parting surface 86A, and when the fixed type 82 and the movable type 86 are closed, the protrusion 88 is a runner of the boundary portion 86ABC and the fixed type 82. It is placed between R.

As shown in FIGS. 4B and 4C, when the molten resin is injected from the runner R into the cavity C, the molten resin flows toward the sensor film 12. As shown in FIG. 4C, since a wall-shaped protrusion 88 is arranged between the sensor film 12 (boundary portion 12AB) and the runner R, this protrusion 88 serves as a protective wall and the sensor is made of fluid resin. The pressing of the end face of the film 12 is suppressed.

As a result, the pressing force acting on the sensor film 12 from the fluidized resin can be reduced. Further, the shearing force acting on the wiring provided on the sensor film 12 (leading wiring at the boundary portion 12AB) can be reduced.

More specifically, according to the mold 80, as shown in FIG. 3A, a drawer portion 12B projecting to the outside of the cavity C in the sensor film 12 is arranged between the fixed mold 82 and the movable mold 86. ..

As shown in FIG. 4B, when the molten resin is injected from the runner R into the cavity C, the portion of the sensor film 12 located inside the cavity C (that is, the main body portion 12A fixed to the main body fixing portion 86AB). The end face of is pressed by the fluidized resin.

On the other hand, the portion located outside the cavity C (that is, the drawer portion 12B fixed to the drawer portion fixing portion 86AC; see FIG. 3A) is not pressed. Therefore, a shearing force acts on these boundary portions (boundary portion 12AB) shown in FIG. 4 (C).

Here, since the wall-shaped protrusion 88 is arranged between the boundary portion 12AB and the runner R, the protrusion 88 serves as a protective wall, and the pressing of the end surface of the boundary portion 12AB by the fluidized resin is suppressed. As a result, it is possible to prevent the shearing force acting on the boundary portion 12AB, which is the boundary portion between the portion pressed by the fluidized resin and the portion not pressed by the fluidized resin, from being increased by the molten resin.

Further, in the resin molded product 10 formed by the mold 80, as shown in FIG. 1, a groove 40V1 is formed along the outer periphery of the sensor film 12 in the covering material 40 that covers the sensor film 12. Therefore, when the back surface of the resin molded product 10 is adhered to another member (for example, a liquid crystal display panel or an organic EL display panel), the groove 40V1 can be filled with an adhesive. As a result, the adhesive strength is improved as compared with the configuration without the groove 40V1, and the sticking strength to another member is improved. As a result, peeling of the sensor film 12 can be suppressed.

Specifically, in the resin molded product 10, the main body 12A of the sensor film 12 is covered with the covering material 40, while the drawer portion 12B of the sensor film 12 projects to the outside of the covering material 40. Therefore, when an external force is applied to the drawer portion 12B, a peeling force is applied to the boundary portion 12AB between the main body portion 12A and the drawer portion 12B.

However, in the resin molded product 10, the groove 40V1 of the covering material 40 is formed along the outer circumference of the boundary portion 12AB. By filling the groove 40V1 with an adhesive, the adhesive strength to another member is improved, so that the boundary portion 12AB can be hardly peeled off even if a peeling force acts on the boundary portion 12AB. As a result, it is possible to prevent the main body portion 12A from peeling off with the boundary portion 12AB as the base point.

In the present embodiment, in the boundary portion 12AB, the groove 40V1 is formed only on the outer peripheral portion on the gate cutting portion 40C side, but the groove 40V1 is also formed on the outer peripheral portion on the opposite side to the gate cutting portion 40C. Can be done. As a result, the sticking strength to another member is further improved, so that the peeling suppressing effect of the sensor film 12 can be enhanced.

When the groove 40V1 is also formed on the outer peripheral portion on the opposite side of the gate cutting portion 40C, it is the outer peripheral portion of the boundary portion 86ABC in the movable mold 86, and the runner is formed when the fixed mold 82 and the movable mold 86 are closed. A protrusion 88 is also formed at a position sandwiched between R and the opposite side.

(Modification example)
In the mold 80 according to the embodiment of the present invention, as shown in FIG. 2B, the protrusion 88 has a boundary portion 12AB (see FIG. 1) of the sensor film 12 on the parting surface 86A of the movable mold 86. Although it is arranged along the outer periphery of the boundary portion 86ABC to be fixed, the embodiment of the present invention is not limited to this.

For example, as shown in the protrusions 88A and 88B shown in FIGS. 5A and 6A, the sensor film 12 may be arranged along the outer circumference of the main body fixing portion 86AB in addition to the boundary portion 86ABC.

The protrusion 88A of FIG. 5A includes at least a position sandwiched between the main body fixing portion 86AB and the runner R when the fixed mold 82 and the movable mold 86 are closed on the outer peripheral portion of the main body fixing portion 86AB. Is formed in.

As a result, not only the boundary portion 12AB but also the main body portion 12A of the sensor film 12 shown in FIG. 5B is protected from the fluidized resin, so that the pressure reducing effect of the fluidized resin can be enhanced.

As shown in FIG. 5B, a groove 40V2 is formed along the outer periphery of the sensor film 12 on the covering material 40 of the resin molded product 10 formed by using the mold 80 provided with the protrusion 88A. Has been done. Specifically, a groove 40V2 is formed between the boundary portion 12AB and the main body portion 12A and the gate cutting portion 40C.

Therefore, in the sensor film 12, peeling of the gate side portion which is easily distorted due to the influence of the heat of the molten resin and the pressing force during molding of the covering material 40 can be suppressed. As a result, even if the sensor film 12 is distorted by the molten resin, poor adhesion due to the distortion can be suppressed.

Further, the protrusion 88B in FIG. 6A is located at the outer peripheral portion of the main body fixing portion 86AB at a position where the fixed mold 82 and the movable mold 86 are sandwiched between the main body fixing portion 86AB and the runner R when the fixed mold 82 and the movable mold 86 are closed. , The main body fixing portion 86AB and the cavity portion 84A are formed so as to include a position sandwiched between the runner R and the wall on the opposite side. That is, the protrusion 88B is arranged so as to surround the main body fixing portion 86AB (over the outer circumference of the main body fixing portion 86AB).

Such a protrusion 88B is suitable for molding a resin molded product by the cavity portion 84A having a curved surface, for example, as in the cavity portion 84A shown in FIG. 6 (B). In the cavity portion 84A, the depth of the peripheral portion is shallower than the depth of the central portion, and when the molten resin is injected into the cavity C, the molten resin is filled in advance from the peripheral portion having a shallow depth and gradually moves toward the central portion. Flows.

Since the protrusion 88B is arranged so as to surround the main body portion 12A, it is possible to prevent the fluidized resin from pressing the end surface of the main body portion 12A. As described above, when the cavity portion 84A has a curved surface, the flow path of the molten resin becomes complicated as compared with the case where the cavity portion 84A does not have a curved surface. However, even in such a case, the flow resin is suppressed from directly pressing the end face of the sensor film 12, and the pressure reducing effect on the end face of the sensor film 12 can be obtained.

Further, when the flow path of the molten resin becomes complicated, air pools and gas pools are generated in the cavity C, and it may be difficult to uniformly fill the covering material 40.

However, as shown in FIG. 6C, the covering material 40 formed by using the mold 80 provided with the protrusion 88B has a groove 40V3 formed over the outer periphery of the sensor film 12. Specifically, the groove 40V3 is formed so as to surround the boundary portion 12AB and the main body portion 12A.

Therefore, the adhesive can be filled over the outer circumference of the sensor film 12. As a result, the peeling suppressing effect of the sensor film 12 can be enhanced as compared with the case where the groove is formed only on a part of the outer periphery of the sensor film 12.

Although FIG. 6B shows a configuration in which the cavity portion 84A in the fixed mold 82 has a curved surface, the portion of the movable mold 86 facing the cavity portion 84A may have a curved surface. These curved surfaces include curved surfaces having a constant curvature throughout, curved surfaces having different curvatures in directions intersecting each other, curved surfaces having a plurality of different curvatures in the same direction, surfaces in which curved surfaces and flat surfaces are mixed, and the like. Can be. That is, the covering material 40 can have an arbitrary three-dimensional shape.

Further, in the present embodiment, the front side of the covering material 40 is exposed, but the embodiment of the present invention is not limited to this. For example, as shown in FIG. 8, the front side of the covering material 40 is decorated by assembling the resin decorative layer 50 previously formed into a shape along the cavity 84 to the cavity portion 84 of the fixed mold 82. May be good. As a result, the covering material 40 can be protected, and the operability of the resin molded product 10 as a touch panel can be improved.

In the embodiment of the present invention, the movable type 86 may be provided with an exhaust hole for gas venting. The exhaust hole can be provided along the parting surface 86A as an example. As a result, the air in the cavity C is discharged to smooth the flow of the molten resin, and the high temperature gas generated from the molten resin can be discharged to the outside of the cavity C.

Further, the exhaust hole can be provided adjacent to the protrusion 92A, for example, as in the exhaust hole 90 shown in FIGS. 8A to 8C. Specifically, the fixed mold 82 and the movable mold 86 can be provided at a position sandwiched between the protrusion 92A and the runner R of the fixed mold 82 in a closed state.

The protrusion 92A is a part of the assembly member 92 which is a separate member from the movable type 86. As shown in FIG. 9, the assembly member 92 is inserted into the insertion hole 86SA formed in the front mold 86S constituting the movable mold 86. The portion protruding from the parting surface 86A in the state where the assembly member 92 is inserted into the insertion hole 86SA is the protrusion 92A.

The assembly member 92 is held in a state of being sandwiched between the front type 86S and the rear type 86T constituting the movable type 86. A groove 90A and a through hole 90B are formed in the front type 86S and the rear type 86T, respectively. The groove 90A is a groove formed in the hole wall of the insertion hole 86SA, and the through hole 90B is a hole having substantially the same cross-sectional dimension as the groove 90A. When the front type 86S and the rear type 86T are assembled with the assembly member 92 inserted into the insertion hole 86SA, an exhaust hole 90 communicating from the front type 86S to the rear type 86T is formed.

By forming such an exhaust hole 90, as shown in FIG. 8C, it is possible to prevent the boundary portion 12AB of the sensor film 12 from being exposed to the high temperature gas generated from the molten resin. As a result, it is possible to prevent the sensor film 12 from being distorted by heat.

The exhaust hole 90 may be provided adjacent to the protrusion 88A shown in FIG. 5A or the protrusion 88B shown in FIG. 6A. When the protrusions arranged along the outer circumference of the main body fixing portion 86AB are provided like the protrusions 88A and 88B, it is preferable that the exhaust holes 90 are scattered at a plurality of positions along these protrusions. As a result, it is possible to prevent the main body 12A of the sensor film 12 fixed to the main body fixing portion 86AB from being exposed to the high temperature gas generated from the molten resin.

Further, as shown in FIG. 6B, the exhaust hole 90 is preferably applied when the fixed cavity portion has a curved surface. That is, when the molten resin is injected into the cavity formed by the cavity portion having a curved surface such as the cavity portion 84A, the flow of the resin becomes complicated, so that air pools and gas pools are likely to occur in the cavity. Therefore, by providing an exhaust hole 90 adjacent to the movable protrusion, air or gas can be easily discharged.

In the present embodiment, the movable type 86 is moved with respect to the fixed type 82, but the embodiment of the present invention is not limited to this. For example, the movable type 86 may be configured to be immovable (fixed type), and the fixed type 82 may be configured to be moved (movable type). As described above, the present invention can be carried out in various aspects.

12 Sensor film 82 Fixed type (first type)
84 Cavity (cavity)
84A Cavity (cavity)
86 Movable type (second type)
86AB Main body fixing part (first fixing part, fixing part)
86AC Drawer fixing part (second fixing part, fixing part)
86ABC Boundary 88 Protrusion 88A Protrusion 88B Protrusion 90 Exhaust hole R Runner

Claims (4)

First mold with runner and cavity filled with molten resin,
A second type in which a fixing portion capable of fixing a sensor film having wiring is formed on a facing surface facing the cavity, and
A wall-shaped protrusion formed along the outer circumference of the fixed portion and arranged at a position sandwiched between the fixed portion and the runner in a state where the first mold and the second mold are closed.
Mold with. The fixed part is
In a state where the first mold and the second mold in a closed state are viewed from the front,
The first fixing part located inside the cavity,
A second fixing portion, which protrudes from the first fixing portion in the in-plane direction and allows the sensor film to be arranged between the first fixing portion and the first mold, is provided.
The protrusion is formed along the outer circumference of the boundary between the first fixing portion and the second fixing portion.
The mold according to claim 1. The cavity has a curved surface
The protrusions are arranged over the outer periphery of the fixing portion in a state where the first mold and the second mold are closed.
The mold according to claim 1 or 2. An exhaust hole is formed in the second mold adjacent to the protrusion.
The mold according to any one of claims 1 to 3.