JP2001277399A - Extruded product of high-magnification foamed resin with excellent moldability and decorativeness - Google Patents

Abstract

(57) [Problem] To provide an extruded product made of a high-magnification foamed resin excellent in moldability and capable of decorating the surface. SOLUTION: The surface of a core layer 2 made of a foamed resin having an expansion ratio of 10 times or more is melted at a melt flow rate of 0.5 to 10 times.
It is an extruded product 1 of a high-magnification foamed resin covered with a skin layer 3 made of a low-foaming and non-foaming resin having a thickness of 0.1 to 0.5 mm and / or a film thickness of 0.1 to 0.5 mm. Not
Post-swelling after molding can be suppressed and printing can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruded product made of a high-magnification foamed resin mainly used as a building member such as a peripheral edge or a baseboard, and particularly to an extruded product excellent in formability and surface decorativeness. It is a molded product.

[0002]

2. Description of the Related Art Heretofore, extruded articles made of high-magnification foamed resin having an expansion ratio of 10 times or more have been used mainly as building materials such as surrounding edges, baseboards, etc., and as heat insulating materials and cushioning materials. . This molded article is widely used as a molded article that is lightweight, has excellent heat insulating properties, and has excellent shock absorption properties. However, the shape is often a simple shape such as a square shape, a plate shape, a sheet shape or the like, and the shape shape is rarely complicated.

[0003]

If such a shaped article is cooled immediately after extrusion and then molded, it is difficult to cool down to the center of the molded article. Cannot be obtained, and in order to obtain it, sufficient cooling is required. However, when sufficiently cooled, the surface of the molded product has wrinkles and cannot be used as a product. It should be noted that, if a hardened skin layer is formed on the surface as in the case of a low-foamed molded article, molding can be performed. Therefore, it is difficult to cure, and it is difficult to form a skin layer.

Further, in order to decorate a surface with a pattern or pattern, a decorative sheet is attached, a pattern is printed with a paint, or the pattern is transferred by a hot stamp. And there is a problem that the texture is not easily obtained by printing, the coating is peeled off, and the pattern is easily peeled off by hot stamping.

[0005] Furthermore, in order to obtain a good surface,
If the resin pressure is low, the surface breaks and becomes rough, and it is necessary to apply a considerably high resin pressure to the tip of the mold.

Therefore, as a method for improving this compact, there is a production method described in Japanese Patent Application Laid-Open No. 11-170331. In this method, the core layer and the surface layer are extruded in a separated state, and the core layer is integrated by expanding outward.

However, in this method, it is very difficult to match the flow of the core layer and the surface layer, and it is possible to use a simple shape such as a plate shape or a round shape. There was a problem that the resin of the layer did not spread.

Accordingly, an object of the present invention is to provide an extruded product made of a high-magnification foamed resin which is excellent in moldability and whose surface can be decorated.

[0009]

In order to solve the above-mentioned problems, according to the extrusion molded article of the high-magnification foamed resin of the present invention, the surface of a core layer made of a foamed resin having an expansion ratio of 10 times or more,
The melt flow rate is 0.5 to 10 g / 10 minutes,
It is characterized by being covered with a skin layer made of a low foaming or non-foaming resin having a thickness of 0.1 to 0.5 mm.

Thus, when the core layer is discharged from the mold and foams, the skin layer extends so as to follow the foaming, so that the surface of the core layer can be covered with the skin layer.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Surrounding edge (extruded product) 1 of the present invention
As shown in FIGS. 1 and 2, the surface of a core layer 2 made of a foamed resin is
It is a configuration covered with. The core layer 2 is a foamed resin having an expansion ratio of 10 times or more, preferably 15 to 35 times, and specifically, polystyrene resin, polyethylene resin, acrylonitrile-butadiene-styrene copolymer (ABS resin), ethylene-acetic acid. A vinyl copolymer (EVA resin) is used.

The skin layer 3 has a melt flow rate of 0.1.
It is a low-foaming or non-foaming resin having a thickness of 5 to 10 g / 10 min, preferably 0.6 to 5 g / 10 min, and a thickness of 0.1 to 0.5 mm. If the value of the melt flow rate is less than the above range, the resin pressure is excessively applied, so that the resin cannot be clogged with the mold.
The flow of the resin is fast, and the resin is biased to a place where the resin easily flows, so that a skin layer cannot be formed on the surface of the core layer. Also,
When the film thickness is below the above range, the foaming pressure of the core layer cannot be sufficiently suppressed and the film is torn. When the film thickness is above the above range, the core layer does not expand and foaming of the core layer is suppressed. As a specific resin, in addition to the resin of the core layer 2, a high-impact polystyrene resin and a resin obtained by foaming the resin at a low level can be used.

Next, a method of forming the peripheral edge (extruded product) 1 will be described with reference to FIG. First, the core layer 2 is obtained by mixing a nucleating agent (baking soda) with a polystyrene resin, supplying this raw material to a hopper of a dandem extruder, and feeding carbonic acid through an injection port provided in a cylinder portion of a first extruder (not shown). The gas is injected, melted and kneaded, extruded into the second extruder 10, cooled to an appropriate temperature by the second extruder 10, and then extruded into the mold 11. On the other hand, the skin layer 2 is supplied with a polystyrene resin (which may contain a foaming agent) to a hopper of a two-layer forming extruder 12, melted and kneaded, and extruded from a discharge port 13 of a mold 11.
The extruded core layer 2 and the skin layer 3 merge in the mold 11 and increase the resin pressure so that the resin does not foam.
1 and is guided to the sizer 14 and cooled to the product shape. When the resin of the core layer 2 is extruded from the mold 11, it expands and expands. At this time, since the skin layer 2 extends following the expansion of the core layer 2, it can be covered without breaking.

By such a manufacturing method, a peripheral edge (extruded product) 1 of a resin having a foamed resin inside and a hard surface can be formed. Since the peripheral edge (extruded product) 1 has a hard skin layer 3 on its surface, it does not have a rough surface even when extruded at a low pressure, is excellent in moldability such as being able to suppress post-swelling after molding, and has excellent printability. It is also excellent in decorating properties that can be used as a pot stamp, and the interior is made of a high-magnification foamed resin core layer 2 so that the weight can be reduced.

Examples and comparative examples are shown below. The evaluation in the examples was performed as follows. Moldability From the obtained molded products, moldability was evaluated according to the following criteria. ◎ Good moldability without surface condition and swelling after molding. ○ Although moldability is good, wrinkles are formed in the corners, and the adhesion strength of the skin layer is weak. △ Molding is possible, but the product is easily cut and swells afterwards. × Unable to mold. Decorative properties Printing was performed on the surface of the obtained molded article, and the decorative properties were evaluated according to the following criteria. ○ Printable and good decoration × Cannot be molded and cannot be printed.

Example 1 The core layer 2 was composed of a mixture of 100 parts by weight of polystyrene (specific gravity: 1.05 MFR1.4) and 0.4 parts by weight of a nucleating agent (citric acid baking soda), and 3.0 parts by weight of carbon dioxide. The part is pressed, melted and kneaded, and extruded into a mold.
On the other hand, the skin layer 3 is made of high impact polystyrene (MFR
1.8) is extruded from the discharge port of the mold part. The resin pressure at this time is 140 kg / cm2. The above-mentioned evaluation was performed about the obtained molded article. Table 1 shows the obtained results.

Example 2 A skin layer 3 was prepared in the same manner as in Example 1 except that 2.0 parts by weight of a chemical blowing agent was mixed with 100 parts by weight of high impact polystyrene (MFR1.8). The resin pressure at this time is 140 kg / cm2. The above-mentioned evaluation was performed about the obtained molded article. Table 1 shows the obtained results.

Example 3 The skin layer 3 was made of polystyrene (M
FR1.5) The same procedure as in Example 1 was carried out except that the amount was changed to 100 parts by weight. The resin pressure at this time is 140 kg / cm2. The above-mentioned evaluation was performed about the obtained molded article. Table 1 shows the obtained results.

Comparative Example 1 The skin layer 2 was not formed and only the core layer 2 was used. The core layer 2 is made of polystyrene (specific gravity 1.05
A mixture of 100 parts by weight of MFR 1.4) and 0.4 parts by weight of a nucleating agent (citric acid-based sodium bicarbonate) is injected with 3.0 parts by weight of carbon dioxide, melted and kneaded, and extruded into a mold. The resin pressure at this time is 160 kg / cm2. The above-mentioned evaluation was performed about the obtained molded article. Table 1 shows the obtained results.

Comparative Example 2 The procedure of Example 1 was repeated, except that the skin layer 3 was changed to 100 parts by weight of high impact polystyrene (MFR21). The resin pressure at this time is 100 kg
/ Cm2. The above-mentioned evaluation was performed about the obtained molded article. Table 1 shows the obtained results.

[0021]

[Table 1]

[0022]

According to the extrusion molded product of the high-magnification foamed resin of the present invention, in addition to being lightweight, the resin pressure at the time of molding can be extruded at a low level, the shape change after molding is small, and printing and printing can be performed. A molded product capable of pot stamping can be obtained.

[Brief description of the drawings]

FIG. 1 is a front oblique view showing a peripheral edge (extruded product) 1 of the present invention.

FIG. 2 is a sectional view showing a molding method for molding a peripheral edge (extruded product) 1 of the present invention.

[Explanation of symbols]

 Reference Signs List 1 peripheral edge (extruded product) 2 core layer 3 skin layer 10 second extruder 11 mold 12 two-layer forming extruder 13 discharge port 14 sizer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B29L 9:00 B29L 9:00

Claims (1)

[Claims] 1. The surface of a core layer made of a foamed resin having an expansion ratio of 10 times or more is coated with a melt flow rate of 0.5 to 10 g.
/ 10 minutes, and a high-magnification foamed resin excellent in moldability and decorativeness characterized by being covered with a skin layer made of a low foaming or non-foaming resin having a thickness of 0.1 to 0.5 mm. Extruded products.