JPH07256678A - Regenerated wheel cap and manufacture thereof - Google Patents

Abstract

PURPOSE:To manufacture a regenerated wheel cap, the lowering of the strength of which and the poor adhesion of coating to which are suppressed, by a method wherein the particles of aluminum flakes containing in a metallic coated surface are ground finer. CONSTITUTION:In order to break up the particles 11 of aluminum flakes in the coated surface 3a of crushed pieces 3 prepared by crushing regenerating wheel caps 1 made of modified polyphenylene ether-based resin into the size of 30mum or less, the crushed pieces 3 are passed through a kneader 4 and turned to re-pellets 7. A regenerated wheel cap 10 is injection-molded out of reproduced stock resin, which is prepared by mixing the re-pellets 7 with virgin pellets 8 at the mixing ratio of the re-pellets of 50% or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remanufactured wheel cap which uses a defective wheel cap product or a used wheel cap, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, an automobile wheel cap is
It is formed by injection molding using a modified polyphenylene ether-based resin (hereinafter referred to as PPE-based resin), and its surface is metallically coated to give it a metallic appearance. The reason why the PPE resin is used for manufacturing the wheel cap is that the required strength can be obtained even if the thickness of the wheel cap is reduced in order to reduce the weight of the undercarriage. In addition, an acrylic urethane-based paint containing aluminum flakes is generally used for the metallic coating.

[0003]

By the way, as a method of manufacturing a remanufactured wheel cap by using a wheel cap which has been defectively manufactured or a used wheel cap recovered from the market, a crusher is used for remanufacturing the wheel cap for recycling. It is conceivable to perform injection molding by using finely crushed virgin pellets mixed with virgin pellets (unused pellets) as a raw material. However, the reproduction wheel cap manufactured by this method is inferior in tensile strength and Izod impact strength if the shape and size are the same as those of the wheel cap manufactured only from virgin pellets, which is not practical.

This is because the particles of aluminum flakes contained in the paint are only about 50 to 150 μm in size when the original wheel cap for reproduction is crushed only by a crusher.
It is thought that the reason is that it remains relatively large in the molded product. In addition, when the recycled wheel cap is manufactured by this method, there is also a problem that aluminum flakes having a relatively large particle size contained in the crushed material appear on the surface of the recycled product and the paint is difficult to adhere thereto.

Therefore, the technical problem to be solved by the present invention is to provide a method for manufacturing a reproduction wheel cap, which can make the aluminum flakes contained in the coated surface of the reproduction wheel cap finer during the manufacturing process, and a product. The purpose is to provide a small reproduction wheel cap of the aluminum flake particles contained therein.

[0006]

In order to solve the above-mentioned technical problems, a method of manufacturing a reproduction wheel cap according to the present invention is to crush and crush a reproduction wheel cap made of a modified polyphenylene ether resin. The step of forming the pieces and extruding the pieces through a kneading machine commonly used to form pellets so that the particles of aluminum flakes contained in the coated surface of the pieces have a size of 30 μm or less. After that, a step of forming a re-pellet by cutting the re-pellet into a predetermined length and a step of forming a re-wheel cap molded article by injection-molding the re-pellet with a recycled raw material resin mixed with a virgin pellet at a mixing ratio of 50% or less It is characterized by having and.

Further, by applying this method, the aluminum flake particles contained in the coated surface of the reproduction wheel cap made of the modified polyphenylene ether resin are formed to have a size of 30 μm or less. There is provided a reproduction wheel cap formed of a reproduction raw material resin in which repellet is mixed with virgin pellets at a mixing ratio of 50% or less.

[0008]

[Operations / Effects] With the above structure, since the aluminum flakes on the coated surface are crushed to a size of 30 μm or less in the step of forming the repellet from the reproduction wheel cap, the molded reproduction wheel cap has an extremely small particle size. Only aluminum flakes will be included. For this reason, since the aluminum flakes contained in the painted surface of the original wheel cap for recycling are contained in the recycled wheel cap in a more finely dispersed state, it is possible to suppress the decrease in strength due to the aluminum flakes. Since the particle diameter of the paint is extremely small, it is possible to prevent the adhesion failure of the paint even if it appears on the surface of the reproduction wheel cap. That is, according to the present invention, a practical reproduction wheel cap can be manufactured. Moreover, in this method, a conventional general kneading machine can be used for forming the repellet, so that a dedicated device is not necessary for manufacturing a practical reproduction wheel cap.

A wheel cap made of a material other than PPE resin has remarkably reduced physical properties such as tensile strength and Izod impact strength due to heat applied during re-pelletizing and injection molding, and therefore, it can be regenerated. Is not suitable, and conversely, it can be said that the method of the present invention is particularly suitable for the regeneration of a wheel cap made of a PPE resin.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A reproduction wheel cap and a method of manufacturing the same according to one embodiment of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a diagram showing the schematic steps of this manufacturing method. In this method, first, a wheel cap 1 for reproduction such as a defective product at the time of manufacture or a used wheel cap recovered from the market is crushed by a crusher 2 to have a side of 1.5 mm.
A crushed piece 3 having a size of about 7.5 mm is formed. next,
The crushed pieces 3 were crushed using a kneading machine 4 which has been generally used to form pellets so that the particles of aluminum flakes contained in the coated surface 3a of the crushed pieces 3 have a size of about 30 μm or less. After kneading, extrusion molding and passing through a cooling tank 5 containing cooling water 5a, and after this solidifies, a cutter 6
The repellet 7 is formed by cutting with. The re-pellet 7 has a diameter of about 3 mm and a length of about 3 to 5 mm, and has substantially the same size as the virgin pellet 8. And this re-pellet 7
Is mixed with the virgin pellet 8 and supplied to the injection molding machine 9 to form a recycled wheel cap molded product 10. Further, the wheel cap molded product 10 is subjected to metallic coating to complete the manufacturing of the recycled wheel cap.

Next, the reusable resin obtained by crushing the regenerating wheel cap 1 by the above-described method and re-pelletizing it and the re-using resin that has been crushed but not re-pelletized are
10% and 30% of the total resin material for recycling
Regarding several kinds of recycled wheel caps formed by mixing with the virgin pellets 8 so that the mixing ratios are 50%, 50% and 100% (when the mixing ratio is 100%, only the recycled resin is used as a raw material). , Tensile strength ratio (retention ratio) and Izod impact strength ratio (retention ratio) for wheel caps made of virgin pellets only
The results of the measurement will be described with reference to the graphs shown in FIGS. 2 and 3. In these graphs, the solid line shows the case of using the re-pelletized recycled resin, and the broken line shows the case of using the crushed recycled resin.

FIG. 2 shows the measurement results of tensile strength. When the re-pelletized recycled resin was mixed with the virgin pellet 8 to manufacture the recycled wheel cap 10, as shown in the drawing, the tensile strength was not decreased regardless of the mixing ratio. On the other hand, in the case of using the recycled resin just crushed, the tensile strength was reduced by about 20% when the mixing ratio was about 50%.

FIG. 3 shows the measurement results of Izod impact strength. As shown in the figure, when re-pelletized recycled resin is used, the Izod impact strength gradually weakens as the mixing ratio increases, but the reduction rate is
When the mixing ratio is 50%, the reduction is about 10%, and when the re-pelletized reclaimed resin is used, the reduction is only about 15%. On the other hand, when the recycled resin that has just been crushed is used, the Izod impact strength decreases by about 10% when the mixing ratio is 10% and 30%, and decreases by about 20% when the mixing ratio reaches 50%. When only the pulverized recycled resin is used, the reduction is about 30%.

FIG. 4 shows the dispersed state of the aluminum flakes 11 when the recycled resin that has just been crushed is used, and FIG. 5 shows the dispersed state of the aluminum flakes 11 when the repelletized recycled resin is used. . In this way, when using the re-pelletized recycled resin, the aluminum flakes 1
Since 1 is small and evenly dispersed, the decrease in tensile strength and Izod impact strength can be suppressed as described above. Bending strength, heat distortion temperature, flowability, etc. were also measured, but these values did not change when re-pelletized or just crushed.

By the way, the virgin pellets generally used for manufacturing a wheel cap have a tensile strength of 700 kg / cm ² and an Izod impact strength of 26 kg · cm / cm, and the wheel cap has such physical properties. The material is designed to have the required strength, and the shape and dimensions to minimize the weight. On the other hand, the design size of the wheel cap is generally determined with some margin in strength, so the tensile strength value of the raw material resin for molding is 630 kg / cm ² , and the Izod impact strength value is 23 kg. -The required strength can be obtained even with a value of about cm / cm. These values are for virgin pellets 8
Is about 90% of the physical property value, and is a value that can be satisfied when the recycled resin repelletized by the above-mentioned method is used at a mixing ratio of 50% or less.
In other words, when recycled resin that has just been crushed is used, the rate of decrease in these physical properties is large and it is practically difficult to regenerate the wheel cap unless the shape and dimensions of the molded product are changed. On the other hand, if the recycled resin repelletized so that the particles of the aluminum flakes 11 have a size of 30 μm or less is used at a mixing ratio of 50% or less, a practical reproduction wheel cap 10 can be obtained without changing the shape or size. It means that it can be manufactured.

If the wheel cap 1 for reproduction is only crushed, the size of the crushed pieces 3 is not uniform, and powder is generated during the crushing. When the material is melted, fine particles such as powder are first melted, and in the melted state, high heat is applied for a long time, so it is easy to gasify, and as a result, silver streaks tend to occur on the surface of the molded product. If the regenerated raw material resin is re-pelletized, the size of the particles is made uniform, so that the materials are uniformly melted and kneaded, and the occurrence of silver streaks can be prevented. Furthermore, as a result of the particles of the aluminum flakes becoming smaller, the adhesion of the paint is also improved.

[Brief description of drawings]

FIG. 1 is a process chart showing a method for manufacturing a reproduction wheel cap according to an embodiment of the present invention.

[Fig. 2] Tensile strengths of the re-pelletized reclaimed resin mixed with virgin pellets and the crushed reclaimed resin mixed with virgin pellets It is a graph shown as a ratio to the tensile strength in the case.

FIG. 3 shows the Izod impact strengths of re-pelletized recycled resin mixed with virgin pellets and of crushed recycled resin with virgin pellets. It is a graph shown as a ratio to the Izod impact strength when there is.

FIG. 4 is a diagram showing a dispersed state of aluminum flakes when a crushed recycled resin is used as a mixture with virgin pellets.

FIG. 5 is a diagram showing a dispersion state of aluminum flakes in the regenerated wheel cap of the present invention in which the repelletized regenerated resin is mixed with virgin pellets and used.

[Explanation of symbols]

1 Recycle wheel cap 2 Crusher 3 Crushed piece 3a Painted surface 4 Kneader 5 Cooling tank 5a Cooling water 6 Cutter 7 Repellet 8 Virgin pellet 9 Injection molding machine 10 Recycle wheel cap 11 Aluminum flakes

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location B29K 105: 26 B29L 31:00 (72) Inventor Masaaki Hayashi Oguchi-cho, Niwa-gun, Aichi Toyoda No. 1 Stock Company Tokai Rika Denki Seisakusho

Claims (2)

[Claims] 1. A step of crushing a regenerating wheel cap (1) made of a modified polyphenylene ether resin to form a crushed piece (3), and a step of forming a crushed piece (3) on the coated surface (3a). The crushed pieces (3) are extruded through a kneading machine (4) so that the particles (11) of the aluminum flakes contained therein have a size of 30 μm or less, and then cut into a predetermined length and re-pelletized (7). ) Is formed and the re-pellet (7) is injection-molded using a regenerated raw material resin mixed with the virgin pellet (8) at a mixing ratio of 50% or less.
0) is formed, and the manufacturing method of the reproduction | regeneration wheel cap characterized by the above-mentioned. 2. A coated surface (3) of a reproduction wheel cap (1) formed of a modified polyphenylene ether resin.
The aluminum flake particles (11) contained in a) are 30μ
Repellet (7) formed to have a size of m or less
Is a regenerated raw material resin mixed with virgin pellets (8) at a mixing ratio of 50% or less.