JPH1060124A - Molding of colored resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding of a colored resin which can prevent the creation of a flow mark and, in addition, a sink mark on the front surface of the molding of a colored resin and can be easily molded. SOLUTION: This molding of a colored resin comprises: a molding using a colored resin with a brightener and a pigment for coloring incorporated thereinto; and a boss 2 molded integrally with a body 10. The boss 2 comprises a boss substrate 21 and a leg section 23 provided on the side face of the boss substrate 21, and a hole section 25 created by removal of the material is provided between the boss substrate 21 and the leg section 23. The hole section 25 is passed through between the boss substrate 21 and the leg section 23 in a direction parallel to the flow direction N of the colored resin at the time of molding for the preparation of a colored-resin molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin material capable of preventing the occurrence of a flow pattern on the surface of a molded product.

[0002]

2. Description of the Related Art Conventionally, coating has been performed exclusively to impart a uniform and beautiful appearance such as a deep metallic tone or pearl tone to a resin molded article such as a thermoplastic resin. However, such coating requires complicated processes such as degreasing, undercoating, intermediate coating, and topcoating, as well as dust removal, drying, and baking, as well as expensive equipment and paint. In addition, the cycle time of the process becomes longer. Therefore, it is the main factor of cost increase.

[0005] To cope with this, molding using a material-attached resin is also performed. This resin material is
As a metallic or pearly imparting agent, a metallic piece such as scaly aluminum powder or a glittering material such as mica is directly mixed with a resin together with a coloring material. A molded product using such a materialized resin is called a materialized resin molded product.

However, as shown in FIGS. 9 to 12, a boss-coated resin molded product in which a boss is integrally formed on a part of the molded product is a front surface (design surface) 98.
Then, a flow pattern 95 may occur along the resin flow direction (FIG. 11). That is, first, FIGS.
9, a cross-shaped boss 91 is integrally formed to show a material-bonded resin molded product 90 as a long molding. The boss 91 is
It functions as a positioning and fixing device when attaching the materialized resin molded product 90 to the side surface of an automobile. Note that reference numeral 92 in FIG.
Is an adhesive tape provided on the back surface of the material-imparted resin molded product 90.

However, in the above-described materialized resin molded product 90, a flow pattern 95 may be generated on the front side surface 98 as shown in FIG. As shown in FIG. 11, when the resin flows from the gate side K to the non-gate side D during molding, the flow pattern 95 is located downstream of the boss 91 in the resin flowing direction N of the resin. Occurs. This applies to the case where a columnar boss 97 is provided as shown in FIG. The above-mentioned bossed resin-coated resin molded product is manufactured by injection-molding the above-described resin-coated resin in a cavity of a molding die, and simultaneously integrally molding the main body and the boss of the material-coated resin molded product.

[0008] As shown in FIG. 13, a material-bonded resin molded product 8 having a sandwich structure in which the above-described material-containing resin is used as a skin layer and a core layer made of a hard material is injected into the skin layer is also used. Flow patterns 95 may occur. That is, as shown in FIG. 13, on the opposite gate side D opposite to the gate side K which is the resin injection port at the time of molding, a material-attached resin having a bent front end portion 84 whose front end portion is bent in an L shape or the like. In the molded product 8, a flow pattern 95 is generated on the front surface of the bent portion 80.

[0007] As shown in FIG. 14, the material-bonded resin molded product 8 having the sandwich structure is obtained by injecting a material-coating resin 81 for a skin layer into a cavity 871 of a molding die 87, and then into the core layer 82. Molding by injecting resin for use. A tab 88 is provided at the tip of the bent tip portion 84 beyond the molded portion, and excess resin 880 is provided in the tab 88.
Overflow. By the way, the flow pattern 95 generated on the front surface of the materialized resin molded products 9 and 8 shown in FIGS. 11 and 13 is also referred to as so-called “metallic unevenness”. Lower. In addition, sink marks may occur in the portion where the flow pattern occurs.

[0008]

Therefore, in order to prevent the occurrence of the above-mentioned flow pattern and the occurrence of sink marks, the injection pressure of the material-imparted resin is controlled.
Various studies have been made on resin flow speed adjustment and the like. However, in all cases, the molding conditions are difficult, and sufficient results cannot be obtained.

In view of the above-mentioned conventional problems, the present invention is intended to provide a materialized resin molded product which can prevent the occurrence of a flow pattern on the surface of the material-coated resin molded product and furthermore the occurrence of sink marks and is easy to mold. It is assumed that.

[0010]

According to the first aspect of the present invention, there is provided a materialized resin molded article formed by using a materialized resin in which a glittering material and a coloring material are mixed and integrally forming a boss with a main body. Has a boss base and a leg provided on a side surface of the boss base, and a stolen cavity is provided between the boss base and the leg. A materialized resin molded product characterized by being formed so as to penetrate in parallel to the resin flow direction of the materialized resin at the time of molding the materialized resin molded product.

In the present invention, the most remarkable point is that a leg is provided on the side surface of the boss base, and a cavity is formed between the boss base and the leg along the resin flow direction. That is.

The glittering material to be mixed with the above-mentioned resin is metal powder such as the above-mentioned flaky metallic powder or polyhedral metallic powder, or fine particles such as mica. The coloring materials include pigments and dyes, which are appropriately compounded according to a desired color tone. Examples thereof include carbon black, organic green, organic yellow, and inorganic brown. Also,
As the resin, polypropylene, ABS, AES, PV
C and the like.

Next, the function and effect of the present invention will be described.
In the present invention, the boss comprises a boss base and a leg provided on a side surface of the boss, and a cavity is provided between the boss and the cavity, and the cavity is formed of a resin of a material-imparting resin during molding. A through hole is formed parallel to the flow direction.

Therefore, when the resin material flows from the gate side to the opposite gate side during molding, the resin material forms the body of the resin molded article and the boss integrally. To go. In the boss forming portion, the boss is separated into a boss base and a leg. Therefore, in the cavity of the molding die, the resin material flows smoothly and easily into the boss base molding portion and the leg molding portion. Therefore, the difference in the flow speed of the materialized resin between the main body molded portion and the boss molded portion of the materialized resin molded product is reduced.

Therefore, it is possible to prevent the occurrence of a flow pattern on the downstream side of the boss. Further, as described above, since the difference in the flow speed of the material-imparting resin in the molded portion of the main body and the boss is small, sinkage can be prevented as a secondary effect.

Next, as in the second aspect of the present invention, the rear end of the boss base, which is located on the downstream side in the resin flow direction of the material-attached resin, has a width at least at an integral joint with the main body. Is preferably tapered toward the downstream side (FIGS. 2, 3 and 4A). In this case, since the rear end of the boss base is formed to have a tapered shape at the integral joint portion as described above, the flow speed of the material forming resin at and around the boss forming portion is equal to that of the main body forming portion. It is almost the same. Therefore, the effect of preventing the occurrence of the flow pattern is even greater.

Next, as in the third aspect of the present invention, the tip of the boss base, which is located on the upstream side in the resin flow direction of the resin material, has a width at least at an integral joint with the main body. Preferably, it is formed in a tapered shape toward the upstream side (FIG. 5B). Also in this case, since the upstream side of the boss molding portion is formed in a tapered shape toward the upstream in the resin flow direction, the flow speed of the materialized resin in the boss molding portion is almost the same as that of the main body molding portion. The generation of the flow pattern can be further prevented.

Next, as in the fourth aspect of the present invention, a material layered resin in which a glittering material and a coloring material are mixed is used as a skin layer, and a core layer of a hard material is injected into the skin layer. A material-formed resin molded article having a sandwiched structure having a bent front end on the side opposite to the gate side opposite to the gate side at the time, and the material-bonded resin molded product is formed from the general portion to the bent front end. In the part immediately before the bend leading to the part, there is a gradually-varying thickness part whose thickness gradually becomes smaller than that of the general part along the resin flow direction of the materialized resin. You can also.

In the present invention, in the portion immediately before the bending,
The thickness gradually changing portion is provided. For this reason, at the time of forming the material-imparted resin molded product, the flow of the skin layer and the flow of the core layer fed into the skin layer at the bent portion of the bent front end portion become faster. That is, in a molded resin molded product of a resin material, at the time of molding, the skin layer and the core layer injected therein first cause the skin layer to flow into the cavity of the mold with the top cut off.

At this time, conventionally, when the bent front end is located on the opposite side of the gate farther from the gate side, the skin layer is slightly cooled in the meantime, the fluidity of the skin layer is reduced, and the bent portion is particularly bent. The flow speed becomes slower in the bent portion. Therefore, it is considered that the flow pattern is easily generated at the bent portion.

On the other hand, since the present invention has the above-described structure, as described above, the flow speed of the skin layer at the bent portion at the bent tip is almost the same as that of the general portion, that is, the portion other than the bent portion. Become. Therefore, the flow pattern does not occur. Also, there is no occurrence of sink marks.

Next, it is preferable that the thickness gradually changing portion in the portion immediately before the bending has a shape (FIGS. 6 and 7) in which the back side surface of the material-coated resin molded product approaches the front side surface. Further, it is preferable that the thickness gradually changing portion is provided between 0.5 cm and 3 cm in the direction from the inner end of the bent front end portion (the back side surface of the bent front end portion of the material-coated resin molded product) to the general portion. As a result, it is possible to efficiently prevent the occurrence of a flow pattern at the bent front end.

Also, as in the invention of claim 5, the minimum thickness of the gradually changing portion is 25 to 75 times the thickness of the general portion.
%. If it is less than 25%, it will be too thin, so that the core layer will not easily enter the skin layer, and it will be difficult to make the bent tip part a sandwich structure. On the other hand, if it exceeds 75%, it is difficult to obtain the effects of the present invention.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 As shown in FIGS. 1 and 2, this embodiment relates to a material-bonded resin molded product 1 in which a boss 2 is integrally formed. The resin molded article 1 is a side molding to be attached to the side of an automobile or the like.
As shown in FIG. 1 and FIG.
The boss 2 is formed by molding using a material resin in which a glittering material and a coloring material are mixed, and the boss 2 is integrally formed with the main body 10.

The boss 2 has a boss base 21 and legs 23, 23 provided on side surfaces of the boss base 21, and between the boss base 2 and the legs 23 is stolen. There is a hollow part 25. Further, the hollow portion 25 is formed so as to penetrate in parallel with the resin flowing direction N (FIG. 1) of the material-bearing resin when the material-bearing resin molded article 1 is formed. In the present embodiment, the above-mentioned material-deposited resin is mainly made of polypropylene resin, and flake-like aluminum powder is used as a glittering material in the amount of 1.0%.
% (The same applies to the weight ratio or less), and 0.05% of organic green is added as a coloring material. Further, a small amount of an ultraviolet absorption inhibitor, a dispersant, a stabilizer and the like are added.

Next, the operation and effect of the present invention will be described.
In this embodiment, the boss 2 is composed of a boss base 21 and a boss base 25 provided on a side surface thereof, and a penetrating cavity 25 is provided between the two, and the cavity 25 is formed during molding. Are formed in parallel with the resin flow direction N of the material-deposited resin.

Therefore, when the resin material flows from the gate side K toward the opposite gate side D at the time of molding, the resin material integrates the main body 10 of the resin material and the boss 2 with each other. Molding. In the boss molding portion, the boss is separated into a boss base 21 and leg portions 23. Therefore, in the cavity of the mold,
The resin material is also applied to the boss base molding part and the leg molding part.
Inflow smoothly and easily. Therefore, the difference in the flow speed of the materialized resin between the main body molded portion and the boss molded portion of the materialized resin molded product is reduced.

Therefore, it is possible to prevent the occurrence of a flow pattern on the downstream side of the boss 2. In addition, as described above, since the difference in the flow speed of the material-deposited resin in the molded portion of the main body 10 and the boss 2 is small, sink can be prevented as a secondary effect.

Embodiment 2 In this embodiment, as shown in FIGS. 3, 4 and 5A, the boss base 21 is disposed at the rear end located downstream in the resin flow direction N of the material-laminated resin. This is an example in which at least an integral joint portion 210 with the main body 10 has a rear end portion 26 whose width is tapered toward the downstream side. In addition,
The upstream end portion 27 in the resin flow direction N is flat.

In this case, since the rear end portion 26 of the boss base 21 is formed to have a tapered shape at the integrally joined portion as described above, the flow of the resin material in the boss formed portion and the vicinity thereof is reduced. The speed is almost the same as that of the molded part of the main body. Therefore, the effect of preventing the occurrence of the flow pattern is even greater. Others are the same as the first embodiment, and the same effects as the first embodiment can be obtained.

Further, in the material-molded resin molded product of this embodiment,
As shown in FIG. 4B, the width of the boss base 21 at the tip located on the upstream side in the resin flow direction N of the material-attached resin is at least in the integral joint portion 210 with the main body. Tip portion 28 having a tapered shape toward
Can also be provided. Also in this case, since the upstream side of the boss molding portion is formed in a tapered shape toward the upstream in the resin flow direction, the flow speed of the materialized resin in the boss molding portion is almost the same as that of the main body molding portion. The generation of the flow pattern can be further prevented. Further, the same effect as described above can be obtained.

Embodiment 3 As shown in FIGS. 6 to 8, this embodiment relates to a material-bonded resin molded product 3 having a sandwich structure having a bent front end portion 34. FIG. Examples of such a materialized resin molded product 3 include a side molding, a side garnish, and a rocker molding.

The materialized resin molded product 3 of this embodiment is shown in FIGS.
As shown in the figure, a material layered resin in which a glittering material and a coloring material are mixed is used as a skin layer 31, and a hard material core layer 32 is injected into the skin layer 31, and is opposite to the gate side K during molding. This is a sandwich-formed material-attached resin molded product having a bent front end portion 34 whose front end portion is bent on the side opposite the gate side D. In the part 350 immediately before bending from the general part 33 to the bending front end part 34, the materialized resin molded product 3 has a thickness that gradually becomes smaller than the general part 33 along the resin flow direction N of the materialized resin. It has a gradually changing portion 35.

In the present embodiment, as a material-depositing resin for the skin layer 31, a polypropylene resin is used as a main material. .1% was used. As a material for the hard core layer 32, low linear expansion polypropylene was used. As shown in FIG. 6, the minimum thickness D2 of the thickness gradually changing portion 35 is the thickness D of the general portion 33.
1 was set to 50%. The bent tip portion 34 and the general portion 33 have substantially the same thickness.

In this embodiment, the part 350 immediately before the bending is used.
The thickness gradually changing portion 35 is provided at the bottom. Therefore, at the time of forming the material-implanted resin molded product, the flow of the skin layer 31 in the bent portion 36 of the bent tip portion 34 and the flow of the skin layer 3
The flow of the core layer 32 sent into 1 also becomes faster.
That is, as shown in FIG. 8, at the time of molding, the skin layer 31 and the core layer 32 injected therein first cause the skin layer 31 to flow inside the cavity 870 of the molding die 87 at the top.

At this time, the bent tip portion 34 is located on the opposite side D of the gate farther from the gate K (FIG. 6).
Then, the skin layer 31 is slightly cooled during that time, and its fluidity is reduced, and the flow speed is particularly slow at the bent portion 36. Therefore, in the related art, it is considered that the flow pattern is easily generated in the bent portion 36.

On the other hand, in the present embodiment, since the above-described configuration is employed, as described above, the bent portion 36 of the bent front end portion 34 is formed.
The flow speed of the skin layer 31 is substantially the same as that of the portion other than the general portion 33, the bent front end portion 34, that is, the bent portion 36. Therefore, the flow pattern does not occur on the front side. Also, there is no occurrence of sink marks.

[0038]

According to the present invention, it is possible to prevent the occurrence of a flow pattern on the surface of the material-coated resin molded product and the occurrence of sink marks, and to provide a material-formed resin molded product which is easy to mold. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a material-bonded resin molded product according to a first embodiment.

FIG. 2 is a front view of a boss according to the first embodiment.

FIG. 3 is a perspective view of a material-bonded resin molded product according to a second embodiment.

FIG. 4 is a front view of a boss according to a second embodiment.

FIG. 5A is a plan view of a boss in a second embodiment,
(B) A plan view of another boss.

FIG. 6 is a perspective view of a material-bonded resin molded product according to a third embodiment.

FIG. 7 is a sectional view of a material-attached resin molded product according to a third embodiment.

FIG. 8 is a cross-sectional view of a material-bonded resin molded product according to a third embodiment.

FIG. 9 is a back view of a bossed material resin molded product in a conventional example.

FIG. 10 is a rear perspective view of a bossed resin molded product in a conventional example.

FIG. 11 is a view showing a problem of a boss-attached resin molded product in a conventional example.

FIG. 12 is a back perspective view of a bossed resin-molded product in a conventional example.

FIG. 13 is a perspective view of a material-attached resin molded product having a bent tip in a conventional example.

FIG. 14 is an explanatory view of a conventional example at the time of molding a material-attached resin molded product having a bent tip portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Material-molded resin molded article, 10 ... Main body, 2 ... Boss, 21 ... Boss base, 23 ... Leg, 25 ... Cavity, 26 ... Tapered shape Rear end part, 3 ... material-molded resin molded product, 33 ... general part, 34 ... bent tip part, 35 ... gradually changing thickness part, 36 ... bent part,

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C08L 101/00 C08L 101/00 (72) Inventor Takahiko Sato Nagahata 1 No. 1 Toyoda Gosei Co., Ltd. (72) Inventor Harutaka Manabe 1 Ochiai Ogata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture No. 1 Toyoda Gosei Co., Ltd. Address Toyota Gosei Co., Ltd.

Claims (5)

[Claims] 1. A molded resin molded article obtained by molding using a colored resin in which a glittering material and a coloring material are mixed and integrally molding a boss with a main body, wherein the boss comprises a boss base,
A leg provided on a side surface of the boss base, and a stolen cavity is provided between the boss base and the leg, and the cavity is formed of the materialized resin molded product. A molded resin molded article characterized by being formed so as to penetrate in parallel with the resin flow direction of the molded resin during molding. 2. The boss base according to claim 1, wherein a rear end of the boss base located on a downstream side in a resin flow direction of the material-attached resin has
A materialized resin molded product characterized in that at least an integral joint with the main body has a width tapered toward the downstream side. 3. The boss base according to claim 2, wherein the tip located on the upstream side in the resin flow direction of the material-deposited resin has
A materialized resin molded product characterized in that at least an integral joint with the main body has a width tapered toward the upstream side. 4. A skin layer made of a mixture of a glittering material and a coloring material is used as a skin layer, and a core layer of a hard material is injected into the skin layer. A sandwich-formed material-formed resin molded product having a bent front end on the gate side, wherein the material-formed resin molded product is formed immediately before bending from the general portion to the bent front end. A material having a sandwich structure, characterized by having a thickness gradually changing portion whose thickness gradually becomes smaller than that of a general portion along a resin flow direction of the resin. 5. The material according to claim 4, wherein the minimum thickness of the gradually changing portion is 25 to 75% of the thickness of the general portion.