JPH07277092A - Manufacture of plastic ornament and molding metal mold thereof - Google Patents

Abstract

PURPOSE:To form a plastic ornament such as an automobile mascot having a three-dimensional metallic lustrous surface and flexibility by means of a pair of metal molds. CONSTITUTION:A pair of metal molds 34, 42 are closed, and a resin molding 28 is formed. Next, after the molds have been opened, while keeping the resin molding 28 as it is fixed to the lower mold 42, a metallic foil 20 having a hot melt layer is inserted between the metal molds 34 and 42, and then the molds are closed. The metallic foil 20, while covering the resin molding 28, is formed along the outline thereof, and also is heated by a heating part 36, so that the hot melt layer is melted and the metallic foil 20 is bonded on the resin molding 28. Thus, both the resin molding and the formation/bonding of the metallic foil 20 can be carried out by a pair of metal molds 34, 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a mold for manufacturing a plastic ornament, and more particularly to a method for manufacturing a plastic ornament having a metallic luster surface such as an automobile mascot mark and a mold used for the manufacturing.

[0002]

2. Description of the Related Art Generally, the mascot mark of an automobile is
Those having a three-dimensional shape and having a metallic luster on the surface are often used. In order to share such a mascot mark between different vehicle types, various curved surface shapes of the mascot mark attachment points (curved surface shapes differ depending on the vehicle type)
It is preferable that the mascot mark itself has flexibility so that the mascot mark can be freely adapted.

However, since the conventional three-dimensional mascot mark having a metallic luster surface is generally manufactured by wet plating, for example, dip plating, it is difficult to have flexibility. Because, as shown in the cross-sectional view of FIG. 1, the mascot mark 50 formed by this manufacturing method has, for example, a copper layer 52, a nickel layer 53, and a resin layer 51.
The chromium layer 54 is sequentially plated, and the total thickness of these metal layers 58 becomes a certain thickness, at least 30 μm. The metal layer 58 itself has rigidity, so that even if the resin layer 51 has flexibility. Even, mascot mark 5
This is because 0 becomes a rigid body as a whole.

Therefore, the applicant of the present application has proposed a method for producing a plastic ornament such as a three-dimensional mascot mark by in-mold forming using a primary formed metal foil (Japanese Patent Application No. 6-17453). ,
Unpublished). This method, as shown in FIG.
Is processed to form a primary molding portion 81 having predetermined irregularities (details not shown), and the primary molding portion 81 is fitted into a concave mold 71 having a shape corresponding to the irregularities, and in-molded. And a second step of molding.

However, this method requires a mold for molding a metal foil and a mold for in-mold molding, and two pairs of molds having the same shape must be prepared. Therefore, there is a problem that the cost is high. Further, it is also a problem that a difficult work of accurately aligning the primary molding portion of the metal foil with the concave mold for in-mold molding is required.

[0006]

Therefore, the first technical problem to be solved by the present invention is a pair of molds,
That is, the metal foil and the resin can be molded.

A second technical problem to be solved by the present invention is to provide a molding die suitable for use in the molding step.

[0008]

Means for Solving the Problems and Actions / Effects In order to solve the first technical problem, the method for manufacturing a plastic ornament according to the present invention is configured as follows.

That is, the method for producing a plastic ornament is a method for producing a plastic ornament in which a metal foil having a heat seal layer on the back surface is heated and adhered to the surface of a resin molded product. This manufacturing method includes a first step of molding a resin molded product using a pair of molds, and after opening the frame of the mold, a metal foil is placed between the molds while the resin molded product is fixed to one mold. A second step of inserting and closing the frame, molding the metal foil to cover the resin molded product, and heating the metal foil to bond the metal foil to the surface of the resin molded product.

In the above structure, the pair of molds mold the resin molded product in the first step, mold the metal foil in the second step, and bond the metal foil to the surface of the resin molded product. In the second step, the resin molded product functions as, so to speak, a part of the mold, and along its surface shape,
The metal foil inserted between the molds is deformed. That is, the metal foil is formed into a shape that substantially matches the outer shape of the resin molded product. Further, since the metal foil is heated, its heat seal layer is melted and adhered to the surface of the resin molded product.

Therefore, in the above structure, the metal foil and the resin can be molded with the pair of molds, and
The technical problems of are solved. And, the mold cost is reduced, and the alignment of the metal foil molding part is not required,
The problem of the conventional example is solved.

There are three modes of combination of a pair of molds, a concave mold and a convex mold, a concave mold and a flat mold, and a concave mold and a concave mold. In the second step, a resin molded product is formed in any of these molds. It can be fixed. Preferably, as will be described later, the mold on the side where the resin molded product is not fixed is a concave mold.

In the above structure, when the metal foil is formed and adhered in the second step, if the metal foil is heated and adheres to the resin molded product before the metal foil is sufficiently formed, the metal foil is wrinkled. Or breakage will occur. Therefore, it is preferably configured as follows.

That is, the other mold is concave and has a heating means. In the second step, the mold is closed with a slight interval left, and the inserted metal foil is heated by the heating means to a temperature at which the heat-sealing layer of the metal foil is not melted, and the resin molding is performed. The first step of molding along the outer shape of the product, the mold is completely closed to further mold the metal foil, and the metal foil is further heated by the heating means to form the heat seal layer of the metal foil with the resin. The second step of melt-bonding to the molded product.

In the above-mentioned structure, in the first step of the second step of closing the frame with a slight gap left, the metal foil is easily formed, but the concave shape is formed by the heating means to a temperature at which the heat-sealing layer of the metal foil is not melted. Is heated to prevent the metal foil from adhering to the resin molded product during the formation of the metal foil.

Next, in the second stage in which the mold is completely closed, the metal foil is molded a little more and brought into close contact with the resin molded product. Then, at about the same time, the metal foil is further heated by the heating means, and the heat-sealing layer of the metal foil is melted and adhered to the surface of the resin molded product.

Therefore, in the above structure, the metal foil is sufficiently molded and then bonded to the resin molded product.
No wrinkles or tears.

With the above structure, the present invention solves the first technical problem, but the present invention also provides a molding die that solves the second technical problem, as will be described below. .

That is, the molding die is composed of a pair of dies, one of which is a concave mold and is provided with a heating means.

In the above structure, using a pair of molds,
First, a resin molded product is formed. Next, the resin molded product is held in a mold facing the concave mold, and this resin molded product is used as a part of the convex mold for molding the metal foil. After the metal foil is formed by the concave heating means, the heat-sealing layer of the metal foil is melted to bond the metal foil to the resin molded product.

Therefore, the mold having the above construction is suitable for use in a molding step of a resin molded product having a metal foil on the surface.

In the above structure, when the metal foil is molded by using the resin molded product fixed to the mold, the resin molded product is firmly positioned and held, while the metal foil is molded and adhered after completion of the molding process. Preferably, it is easily removed from the mold.

Therefore, the other mold of the molding mold has a holding means for projecting from this mold into the resin molding space to hold the resin molded product, and the resin molded product held by this holding device. And a removing means for removing from.

In the above structure, the holding means is resin-molded while protruding into the resin-molding space, and the resin-molded product is wrapped around the protruding portion of the holding means. Therefore, the resin molded product is held on the side of the mold provided with the holding means and does not move on the mold or fall apart from the mold. As a result, when molding the metal foil, the resin molded product is firmly positioned and held. On the other hand, after the processing of the metal foil is completed, the removing means releases the positioning and holding of the resin molded product by the holding means, and the resin molded product is easily removed from the mold.

Therefore, the molding die having the above structure firmly holds and positions the resin molded product when molding the metal foil, while the resin molded product is easily removed after the molding and bonding of the metal foil is completed. Therefore, it is suitable for use in the molding step of a resin molded product having a metal foil adhered to the surface.

Preferably, the holding means is a holding pin having a widened tip portion protruding from the other mold to the resin molding space substantially vertically. The detaching means is an eject pin that can project into the resin molding space substantially in parallel with the holding pin.

In the above structure, resin molding is performed in a state where the eject pin does not project into the resin molding space. At this time, the resin molded product wraps around the holding pin protruding into the resin molding space. Since the tip of the holding pin is widened, the resin molded product is restrained from moving in the direction perpendicular to the axis of the holding pin. Further, the movement of the holding pin in the direction perpendicular to the axis is restricted. Therefore, the holding pin positions and holds the resin product with respect to the mold. Preferably, the holding pin has a substantially triangular cross section, a substantially quadrangular shape, or the like, or a plurality of holding pins are provided to more firmly restrain the rotation of the resin molded product.

A metal foil is molded along the resin molded product thus positioned and held, and the metal foil is adhered to the surface of the resin molded product, and then the eject pin is projected into the resin molded space to mold the resin molded product with gold. Extrude from the mold. That is, since the eject pin is substantially parallel to the holding pin, the resin molded product is pushed out in the direction of the holding pin and in the direction away from the fixed mold. At this time, the resin portion wrapping around the wide tip portion of the holding pin is spread by the tip portion. Finally, the tip of the holding pin comes out of the resin molded product, and the resin molded product is removed from the mold.

Therefore, the mold having the above structure facilitates the removal of the resin molded product and is suitable for molding the resin molded product having the metal foil on the surface.

[0030]

EXAMPLES A method of manufacturing a plastic ornament according to an example of the present invention shown in FIGS. 3 to 11 will be described in detail below. In this embodiment, a car mascot mark is shown as a plastic ornament.

3 and 4 are a plan view and a sectional view of an example of the mascot mark 10 manufactured by the manufacturing method of the present invention. This mascot mark 10 is a resin molded product 2
8 is formed with a molding portion 24. As shown in FIG. 3, the outer peripheral portion 29a and the inner portion 29b of the mascot mark 10 are
And are raised. As shown in FIG. 4, the raised portion 29 is covered with a molding portion 24 having a shape corresponding to the raised shape.

In the method for manufacturing the mascot mark 10 as described above, the first step of molding the resin molded product 28 using the pair of molds 34, 42, and after opening the molds 34, 42, one of the molds is opened. The metal foil 20 is inserted between the molds 34 and 42 while the resin molded product 28 is fixed to the mold 42, and the frame is closed. The metal foil 20 is molded while being heated, and the resin molded product 20 is covered with the metal foil 20. Is attached to the surface of the resin molded product 28.

That is, in the first step, the upper part 32 and the lower part 40 of the molding machine 30 shown in FIG.
As shown in the above, the concave mold 34 of the upper part 32 and the lower mold 42 of the lower part 40 of the molding machine 30 are closed, and the molten resin is injected into the concave mold 34 from the sprue 44 of the lower part 40 through the gate 43. By filling, the resin molding portion 28
To mold. The resin molding portion 28 has a predetermined uneven shape (details not shown). The resin used is an ABS resin, but it may be another type of resin. The concave mold 34 is provided with a heating unit 36 as a heating means. The heating unit 36 includes a heater (not shown) and a hot water circulating unit (not shown) in which hot water from the temperature adjusting unit 38 provided outside the molding machine 30 circulates.

The molded resin product 28 is held by the lower mold 42 as shown in FIG. That is, the tip portion 48
The holding pin 48 having a widened a is formed in the molding space from the lower mold 42.
By being resin-molded so as to project into the (cavity), the tip end portion 48 of the holding pin 48 is attached to the resin-molded product 28.
An engagement hole 28a with which a is engaged is formed. This engagement hole 28
Since the opening 28b of the a is narrower than the inside 28c of the hole, the holding pin 48 is positioned and held without coming off from the engaging hole 28a.

The lower mold 42 is provided with an eject pin 46 which can project into the resin molding space substantially in parallel with the holding pin 48.
Although the eject pin 46 is normally retracted, it projects into the resin molding space after the second step and separates the resin molded product 28 held by the lower mold 42 from the lower mold 42. That is, when the eject pin 46 projects from the lower mold 42 and forcibly pushes out the resin molded product 28, the resin molded product 28 is pushed out in the axial direction of the holding pin 48 and away from the lower mold 42, and the resin molded product 28 Opening 28b of engaging hole 28a
The periphery is widened by the tip portion 48a of the holding pin 48.
When the eject pin 46 projects a predetermined amount, the holding pin 48
Of the resin molded product 28
Is released from the holding pin 48 and separated from the lower mold 42.

In the second step, after the frame is opened, as shown in FIG. 6, between the lower mold 42 in which the resin molding portion 28 is positioned and held and the concave mold 34 facing the lower mold 42, it is wound in a roll shape. The sheet surface of the peeled metal foil 20 is arranged. Metal foil 2
0 has a three-layer structure as shown in the sectional view of FIG. That is, the metal foil 20 has a transparent film base 21 which is the outermost surface of the mascot mark on one surface of the chrome layer 22 which is a chrome foil, and a resin molded product of the mascot mark 10 on the other surface. The hot melt layer 23, which is a heat seal layer adjacent to 28, is provided. The film base 21 easily deforms when heated. Instead of the chrome layer 22, another metal foil such as an aluminum foil can be used.

Next, the upper part 32 and the lower part 40 of the molding machine 30 are brought close to each other as indicated by arrows 91a and 91b, and the metal foil 20 is sandwiched between the resin molded product 28 and the concave mold 34. At this time, the mold is not completely closed, and for example, a clearance of about 1 mm is provided to close the frame. The closing time and stroke are
In addition to the deformation condition of the metal foil, it is set in consideration of the fact that the heat of the lower mold 42 is not transferred to the concave mold 34 through the metal foil 20, and the temperature of the concave mold 34 is stabilized. Heating part 3
6, the concave mold 34 is heated to a temperature that does not melt the hot melt layer 23 but facilitates molding of the metal foil 20, for example, a temperature of about 50 to 70 ° C., a hot water circulating unit (not shown).
Adjust the temperature by. The surface of the resin molded product 28 is, for example, about 150 ° C. at the time of molding,
When forming the metal foil 20, the hot melt layer 23 is not melted by natural cooling. By the mold closing, the resin molded product 28 functions as a part of the convex mold with respect to the concave mold 34. The metal foil 20 is molded along the outer shape of the resin molded product 28. At this stage, the molded portion of the metal foil 20 is covered with the inner surface of the concave mold 34 and heated to a temperature at which molding is easy. As shown in FIG. 10, the metal foil 20 is molded with a three-dimensional molded portion 24 having a substantially predetermined uneven shape (detailed uneven shape is not shown). However, since the hot melt layer 23 is not heated to the melting temperature, the metal foil 20 does not adhere to the resin molded product 28. The molding portion 24 of the metal foil 20 does not always completely match the shape of the resin molding portion 28 at this point.

Further, the upper and lower molds 34 and 42 are completely closed. The molding portion 24 of the metal foil 20 is further molded until it completely follows the outer shape of the resin molded product 28, and comes into close contact with the outer shape of the resin molded product 28. Almost at the same time as the closed frame, the heating unit 3 of the concave mold 34
The heater (not shown) of 6 operates and the metal foil 20 is heated to a higher temperature, whereby the hot-melt layer 23 of the metal foil 20 is melted and the molding portion 24 of the metal foil 20 becomes the surface of the resin molded product 28. Glued to.

Then, as shown in FIG. 7, when the upper part 32 and the lower part 40 of the molding machine 30 are moved away from each other in the directions of the arrows 92a and 92b and the upper and lower molds are opened, as shown in FIG.
Molded portion 24 made of metal foil 20 on the surface of resin molded product 28
The main body 11 with the foil having the above and the branch portion 12 corresponding to the gate 43 of the lower portion 40 of the molding machine 30 are separated from the metal foil 20 as one body. At this time, holes 25 are formed in the sheet surface of the metal foil 20.

Finally, the push-out pin 46 is the resin molded product 2
8 is forcibly pushed up from the lower mold 42, and the foil-attached main body 1
1 and the branch 12 are separated from the lower mold 42. Further, in association with the push pin 46, the cutter 49 cuts the sheet of the metal foil 20 after forming. Cut metal foil 20a
The main body 11 with foil and the branch 12 are removed from the molding machine 30, and the main body 11 with foil is branched from the main body 11 in a later step.
When 2 is deleted, the mascot mark 10 is completed.

As described above, according to the above manufacturing method, the metal foil 20 and the resin can be molded with the pair of molds 34 and 42. As a result, the cost of the mold, which has been a problem in the past, can be reduced, and the alignment of the metal foil 20 becomes unnecessary. In addition, the molding dies 34, 4 of the above embodiment
2 is suitable for use in the above molding process.

The present invention is not limited to the above embodiments, but can be implemented in various other modes. For example, the metal foil 20 may have a structure other than the above three-layer structure. Alternatively, a male screw may be formed at the tip end portion 48a of the holding pin 48 so that the resin molded product 28 can be rotated to come out of the resin molded product when the resin molded product 28 is removed, and also serves as a removing means. Furthermore, the present invention is widely applicable not only to plastic ornaments such as automobile mascot marks, but also to resin products having a three-dimensional metallic luster surface.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional plastic ornament.

FIG. 2 is a schematic view showing a method of manufacturing a conventional plastic ornament.

FIG. 3 is a plan view of a plastic ornament according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a schematic view showing a method for manufacturing a plastic ornament according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing a step that follows FIG.

FIG. 7 is a schematic diagram showing a step that follows FIG.

FIG. 8 is a cross-sectional view of the metal foil used in FIGS.

9 is a sectional view taken along the line IX-IX in FIG.

10 is a perspective view of a main part taken along a line XX in FIG.

11 is a perspective view of relevant parts taken along a line XI-XI in FIG. 7. FIG.

[Explanation of symbols]

10 Mascot mark (ornament) 11 Main body with foil 12 Branch 20,20a
Metal foil 21 Film base 22 Chrome layer 23 Hot melt layer (heat sheet layer) 24 Molded part 25 Hole 27 Holding part 28 Resin molded product 28a Engagement hole 28b Opening 28c Hole inside 29 Raised part 29a Outer peripheral part 29b Inner part 30 Molding Machine 32 Upper part 34 Concave type 36 Heating part (heating means) 38 Temperature adjusting part (heating means) 40 Lower part 42 Lower mold 43 Gate 44 Resin sprue 46 Extrusion pin 48 Holding pin 48a Tip part 49 Cutter

Claims (5)

[Claims] 1. A method of manufacturing a plastic ornament (10), comprising heating a metal foil (20) having a heat-sealing layer (23) on its back surface to adhere it to the front surface of a resin molded product (28). The first step of molding the resin molded product (28) using (34, 42), and after opening the mold (34, 42), the resin molded product (28) is placed in one mold (42). The metal foil (20) is inserted between the molds (34, 42) while being fixed, the frame is closed, the metal foil (20) is molded, and the resin molded product (20) is covered and heated to form the metal foil.
A second step of adhering (20) to the surface of the resin molded product (28), the method for producing a plastic ornament. 2. The other mold (34) is a concave mold (34) and has heating means (36, 38), and the second step comprises leaving the mold at a slight interval.
The metal foil (20) inserted by closing the frames (34, 42)
While heating the heating means (36, 38) to a temperature at which the heat seal layer (23) of the metal foil (20) is not melted, along the outer shape of the resin molded product (28). In one stage, the molds (34, 42) are completely closed to further form the metal foil (20) and the heating means.
The second step of melt-bonding the heat-sealing layer (23) of the metal foil (20) to the resin molded product (28) by means of (36, 38). Ornament manufacturing method. 3. A molding die comprising a pair of dies (34, 42), wherein one die is a concave die (34) and heating means (36, 38).
A molding die comprising: 4. The other mold (42) is the mold (42).
Holding means (48) for holding the resin molded product (28) by projecting from it into the resin molding space, and removing means for removing the resin molded product (28) held by the holding means (48) from the mold (42) The molding die according to claim 3, further comprising (46). 5. The holding means (48) is the other of the molds.
(42) A tip portion that projects substantially vertically from the resin molding space
(48a) is a holding pin (48) widened, and the detaching means (46) is capable of projecting into the resin molding space substantially parallel to the holding pin (48).
The molding die according to claim 4, wherein