JPH066353B2 - Synthetic resin molded article and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a decorative synthetic resin molded article in which a transparent resin layer is laminated on the outer surface side of an opaque resin layer, and a method for producing the same.

[Conventional technology]

BACKGROUND ART Synthetic resin moldings in which a transparent resin layer is laminated on the outer surface side of an opaque resin layer are used as characters, identification patterns such as marks, or other decorative members formed on the vehicle body of a vehicle. In such a synthetic resin molded article, since the lower opaque resin layer can be seen through the transparent resin layer on the outer surface, decorativeness of a color tone that gives a deep transparency can be obtained.

Conventionally, as this type of synthetic resin molded product, there is one formed by potting molding of a transparent urethane resin, that is, one in which a liquid transparent urethane resin is flowed down on a flat opaque resin layer and laminated so as to cover the outer surface side. It has been proposed (Japanese Patent Publication No. 52-37492). However, in the case of such potting molding, since the urethane resin layer on the outer surface side is formed on the lower opaque resin layer by surface tension, a sharp edge is formed on the outer peripheral edge of the lower opaque resin layer. Without it, the urethane resin layer will flow. Therefore, in the finished product, the upper transparent urethane resin layer cannot cover the outer peripheral side surface of the lower layer and is exposed. Therefore, this may cause yellowing of the exposed portion or separation of the upper layer and the lower layer.
Further, since the urethane resin layer is formed by the surface tension, there is a problem that the thickness of the urethane resin layer is limited.

As another example, a synthetic resin molded product in which an engaging portion is formed on a side surface of a flat plate-shaped opaque resin layer and is engaged with an engaging portion formed under a transparent resin lens to cover the outer surface side of the engaging portion to be laminated. Has been proposed (Japanese Patent Laid-Open No. 63-32586). However, in this synthetic resin molded product, the lens on the outer surface side is engaged and fixed to the engaging portion of the opaque resin layer by elastic deformation of the lip as the engaging portion, and the transparent lens and the lower opaque resin layer are fixed. Since they are laminated by mechanical bonding, they are easily separated from each other, and water vapor, dust, and the like easily enter between them, and the lower opaque resin layer cannot be clearly seen through the upper lens. Also, since the outer periphery of the opaque resin layer is smaller than the outer periphery of the lens by the thickness of the lip, when the lower opaque resin layer is seen through the lens from the outer surface side, the outer peripheral edge of the opaque resin layer is a line. As a result, it is seen inside the outer peripheral edge of the lens, which causes a problem that the decorativeness is impaired.

[Problems to be Solved by the Invention]

It is an object of the present invention to obtain a molded product having a color tone that provides a deep transparency by covering the front outer surface side of an opaque resin layer with a transparent resin layer, and further, a transparent resin layer on the outer surface side and a lower opaque resin layer. Water vapor, dust, etc. do not enter between the two, and when the opaque resin layer is viewed through the transparent resin layer, the lower opaque resin layer can be seen even at the outer peripheral edge of the transparent resin layer. It is an object to propose a synthetic resin molded product that can obtain excellent decorativeness and a method for producing the same.

[Means for Solving the Problems]

The present invention is the following synthetic resin molded article and a method for producing the same.

(1) A tapered opaque resin layer with a radius formed on the outer surface side peripheral edge portion, and fusion bonding so as to cover the entire outer surface side of the opaque resin layer, and a radius is formed on the outer surface side peripheral edge portion. And a tapered transparent resin layer, and a synthetic resin molded product formed at a position where the tips of the opaque resin layer and the transparent resin layer substantially coincide with each other.

(2) The synthetic resin molded article according to (1), wherein the opaque resin layer and the transparent resin layer are made of a relatively soft synthetic resin.

(3) The synthetic resin molded article according to (1) above, wherein the opaque resin is a hard resin and the transparent resin is a relatively soft synthetic resin.

(4) A step of heating a portion substantially along the cut portion of the laminated material in which the thermoplastic transparent resin is fused to the outer surface side of the thermoplastic opaque resin layer, and the outer surface portion of the heated portion is inside And a step of advancing a cutting blade from the outer surface side in a state where the hardness becomes higher to cut the laminated material, a method for producing a synthetic resin molded product.

(5) The method according to (4) above, wherein heating is performed by high frequency dielectric heating or spraying of a heating fluid.

(6) The method according to (4) or (5) above, wherein the cutting is performed while spraying a cooling fluid on the outer surface side.

In the present invention, as the opaque resin, those colored in an arbitrary color tone can be used. When shape retention is required for the entire molded product, it is preferable to use a relatively hard synthetic resin, and when mounting the molded product on a base material with a slight radius corresponding to this radius. It is preferable to use a relatively soft synthetic resin.

The transparent resin may be colorless or colored and a relatively soft synthetic resin is preferably used because scratches and peeling are less likely to occur.

[Action]

In the synthetic resin molded product of the present invention, the lower opaque resin layer is tapered with a radius formed on the outer peripheral edge, and the transparent resin layer is melted so as to cover the entire outer surface side of the opaque resin layer. The outer surface of the opaque resin layer is formed by tapering the outer surface of the opaque resin layer so that the outer surface of the opaque resin layer and the transparent resin layer are substantially aligned with each other. By covering the side with a transparent resin layer, a deep transparent color tone can be obtained. Then, water vapor, dust, etc. do not enter between the transparent resin layer on the outer surface side and the opaque resin layer below, and when the opaque resin layer is seen through the transparent resin layer, even at the outer peripheral edge portion of the transparent resin layer. , The lower opaque resin layer can be seen uniformly, and excellent decorativeness can be obtained.

In the method for producing a synthetic resin molded article of the present invention, the thermoplastic opaque resin layer is heated to a portion substantially along the cut portion of the laminated material in which the thermoplastic transparent resin is fused to the outer surface side and heated. With the hardness of the outer surface of the raised portion higher than that of the inside, the laminated material is cut by advancing from the outer surface side of the cutting blade,
Manufactures synthetic resin molded products. In this case, heating can be performed by high frequency dielectric heating or spraying of a heating fluid. The cutting can be performed while spraying a cooling fluid on the outer surface side.

With such a manufacturing method, the above-mentioned synthetic resin molded product can be obtained.

〔Example〕

Hereinafter, the present invention will be described with reference to the embodiments of the drawings. FIG. 1 is a front view showing a vehicle decorative component to which a synthetic resin molded article of the embodiment is attached, FIG. 2 is a sectional view taken along line AA, and FIG. 3 is line BB.
FIG. In the figure, in a decorative component 1, a synthetic resin molded product 2 that forms an identification pattern such as letters and marks is fixed to a base material 4 via an adhesive layer 3 such as double-sided adhesive, adhesive tape, adhesive, or an adhesive. There is.

The synthetic resin molded product 2 is fusion-bonded so as to cover the entire outer surface side including the side surface of the opaque resin layer 5 and the opaque resin layer 5 which is tapered by forming the radius 5a on the outer peripheral side.
In addition, the transparent resin layer 6 which is tapered by forming a radius 6a on the outer surface side peripheral portion is formed, and the opaque resin layer 5 and the tip portions 5b and 6b of the transparent resin layer 6 are formed at substantially the same position. .

The opaque resin layer 5 uses a thermoplastic resin having a large dielectric loss, such as a colored polyvinyl chloride resin, polyvinyl acetal resin, or acrylic resin. The transparent resin layer 6 is made of a transparent polyvinyl chloride resin, polyvinyl acetal resin, acrylic resin, or other thermoplastic resin having a large dielectric loss.
Both resins are preferably compatible with each other, and resins of the same type are particularly preferred.

In the above-mentioned synthetic resin molded product, the lower opaque resin layer 5 is tapered with the rounded edges 5a formed on the peripheral edge portion on the outer surface side, and the transparent resin layer 6 includes the entire outer surface including the side surface of the opaque resin layer 5. It is fusion-bonded so as to cover the front surface side and is tapered with a radius 6a formed on the outer surface side peripheral edge portion so that the tip portions 5b and 6b of the opaque resin layer 5 and the transparent resin layer 6 substantially coincide with each other. Since it is formed, the opaque resin layer 5
By covering the entire outer surface side of the transparent resin layer 6 with a transparent resin layer 6, a color tone exhibiting a deep transparency can be obtained. Water vapor, dust, etc. do not enter between the transparent resin layer 6 on the outer surface side and the opaque resin layer 5 below, and when the opaque resin layer 5 is viewed through the transparent resin layer 6, the transparent resin layer 6 Even in the outer peripheral portion, the lower opaque resin layer 5 can be seen uniformly, and excellent decorativeness can be obtained.

FIG. 4 is a plan view of the laminated material, and FIGS. 5 to 8 are sectional views taken along the line CC of FIG. 4 showing the manufacturing process. In the figure, 11
Is a laminated material, and the transparent resin layer 6 is provided on the outer surface side of the opaque resin layer 5.
Are fused together.

Reference numeral 12 is a pedestal on which the laminated material 11 is placed and cut. The pedestal 12 is provided with a lower electrode 13 at a portion corresponding to the cut portion of the laminated material 11 to be placed.

Above the pedestal 12, a cutting blade 14 is provided at a position facing the lower electrode 13.
Are provided so as to be movable up and down, and the laminated material 11 is cut between the lower electrode 13 and the lower electrode 13. The cutting blade 14 is arranged so as to cut the outer periphery of the synthetic resin molded product 2 shown in FIG. The cutting blade 14 is made of ceramic, a material obtained by vapor-depositing ceramic on a non-magnetic metal, or the like, has a tapered surface 16 on the cut-off portion 15 side of the laminated material 11, the cutting edge is not very sharp, and the tip is made smooth. Is preferred.

Above the pedestal 12, an upper electrode 17 as a heating device is arranged so as to move up and down along the same locus as the cutting blade 14 when the cutting blade 14 moves up.
Is provided. Similar to the cutting blade 14, the upper electrode 17 has a shape corresponding to the outer shape of the synthetic resin molded product, and is arranged with respect to the laminated material 11 as shown by the chain line in FIG. A high frequency voltage is applied between the lower electrode 13 and the lower electrode 13 to heat a portion substantially along the cut portion 18. The upper electrode 17 rises and then retracts in the horizontal direction, and the cutting blade 14
It does not interfere with the vertical movement of the.

Reference numeral 19 is a nozzle that blows cooling air toward the outer surface of the cutting portion 18 from the side of the cutting portion 15 when the cutting blade 14 advances.

In the method of manufacturing the synthetic resin molded product 2, first, a laminated material 11 manufactured by calender molding, extrusion molding, injection molding or the like of a thermoplastic synthetic resin is placed on a pedestal 12 and cut.

As shown in FIG. 5, the cutting method is as follows. First, with the cutting blade 14 raised, the upper electrode 17 is moved forward and downward to move the laminated material 11
It is set at a position facing the cutting portion 18 of.

In this state, a high frequency voltage is applied between the upper electrode 17 and the lower electrode 13, and high frequency dielectric heating is performed to cut the cut portion 18 of the laminated material 11.
Heating a small area of the resin along. By the high frequency dielectric heating, the resin in the vicinity of the cut portion 18 of the laminated material 11 is heated to a temperature equal to or higher than room temperature evenly on the outer surface portion 11a and the inner portion 11b, but since the outer surface portion 11a is cooled by air at room temperature, It becomes lower than 11b. Therefore, when the inner surface 11b is heated to such an extent that it softens, the outer surface portion 11a becomes harder than the inner surface 11b. 20 is a heating part, and the density of each point shows the high temperature.

From this state, the upper electrode 17 is retracted in the upward and horizontal directions, and instead the cutting blade 14 is directed downward for cutting. This state is shown in FIGS. 6 to 8.

At this time, when the cutting blade 14 is advanced from the outer surface side while blowing the cooling air from the nozzle 19 with the laminated material 11 under tension, as shown in FIG.
Since a has a high hardness, as shown in FIG. 7, it is pushed by the cutting blade 14 so as to be stretched as it is without being cut or broken, and the resin in the inside 11b moves to the peripheral portion. At this time, since the tapered surface 16 is formed on the cutting portion 14 side of the cutting blade 14, the resin is extruded along the tapered surface 16. A part of the resin in the inside 11b easily moves to the non-cutting portion 21 side to form a bulge, but the bulge is prevented by applying tension to the laminated material 11.

When the cutting blade 14 is further advanced in this state, as shown in FIG. 8, the peripheral portions of the opaque resin layer 5 and the transparent resin layer 6 of the non-cutting portion 21 which becomes the synthetic resin molded product 2 are continuous with other portions. While maintaining the appearance, it is transformed into a curved surface,
In the state where 6a is formed, it is cut between the cutting blade 14 and the lower electrode 13, and the synthetic resin molded product 2 as shown in FIGS. 1 to 3 is manufactured.

The opaque resin layer 5 and the transparent resin layer 6 formed by the cutting blades 14 are formed in the vicinity of the back surface portion 2a in a welded state so as to be substantially aligned with each other, and are inconspicuous from the outer surface side. Therefore, the synthetic resin molded product 2 having an excellent appearance can be obtained only by cutting and can be used as it is.

In the above description, the lower electrode 13 may have a shape substantially matching the outer circumference of the synthetic resin molded product 2,
Alternatively, the entire surface may be used as an electrode. Further, although the synthetic resin molded product 2 having an identification pattern such as characters and marks has been described in the above embodiment, it may be a general decorative product such as a molding.

〔The invention's effect〕

According to the synthetic resin molded product of the present invention, the lower opaque resin layer is tapered by forming a radius on the outer peripheral edge, and the transparent resin layer covers the entire outer surface of the opaque resin layer. It is fused to the outer surface of the opaque resin layer and is tapered at the outer peripheral edge so that the tip of the opaque resin layer and the transparent resin layer are formed at substantially the same position. By covering the outer surface side with a transparent resin layer, a deep transparent color tone can be obtained. Then, water vapor, dust, etc. do not enter between the transparent resin layer on the outer surface side and the opaque resin layer below, and when the opaque resin layer is seen through the transparent resin layer, even at the outer peripheral edge of the transparent resin layer. , The lower opaque resin layer can be seen uniformly, and excellent decorativeness can be obtained.

Further, according to the method for producing a synthetic resin molded article of the present invention, the thermoplastic transparent resin is fused to the outer surface side of the thermoplastic opaque resin layer to heat the portion substantially along the cut portion of the laminated material,
Cutting the laminated material by advancing the cutting blade from the outer surface side in a state where the hardness of the outer surface of the heated portion is higher than that of the inside,
Since the synthetic resin molded product is manufactured, the synthetic resin molded product with high decorativeness as described above can be efficiently manufactured only by cutting.

[Brief description of drawings]

FIG. 1 is a front view showing a vehicle decorative component to which a synthetic resin molded article of the embodiment is attached, FIG. 2 is its AA sectional view, FIG. 3 is BB sectional view, and FIG. 4 is a laminated material. Is a plan view, and FIGS. 5 to 8 are sectional views taken along the line CC of FIG. 4 showing the manufacturing process. In the drawings, the same reference numerals denote the same or corresponding parts, 1 is a decorative article, 2 is a synthetic resin molded article, 4 is a base material, 5 is an opaque resin layer, 6 is a transparent resin layer, 5a and 6a are R, 11 Is a laminated material, 12 is a pedestal, 13 is a lower electrode, 14 is a cutting blade, 17 is an upper electrode, and 18 is a cutting part.

Claims (6)

[Claims] 1. An opaque resin layer, which is tapered by forming a radius on the outer surface side peripheral edge portion, and is fused so as to cover the entire outer surface side of the opaque resin layer, and is rounded on the outer surface side peripheral edge portion. And a tapered transparent resin layer, and the opaque resin layer and the transparent resin layer are formed at positions where the tips of the transparent resin layer substantially coincide with each other. 2. The synthetic resin molded product according to claim 1, wherein the opaque resin layer and the transparent resin layer are made of a relatively soft synthetic resin. 3. The synthetic resin molded article according to claim 1, wherein the opaque resin is a hard resin and the transparent resin is a relatively soft synthetic resin. 4. A step of heating a portion substantially along a cut portion of a laminated material in which a thermoplastic transparent resin is fused to an outer surface side of a thermoplastic opaque resin layer, and an outer surface portion of the heated portion. And a step of advancing a cutting blade from the outer surface side in a state where the hardness is higher than that of the inside to cut the laminated material. 5. The method according to claim 4, wherein the heating is performed by high frequency dielectric heating or spraying of a heating fluid. 6. The method according to claim 4, wherein the cutting is performed while spraying a cooling fluid on the outer surface side.