JP3007128B2 - Method for producing foamed resin molded article having a straight grain pattern - Google Patents
Method for producing foamed resin molded article having a straight grain patternInfo
- Publication number
- JP3007128B2 JP3007128B2 JP2281470A JP28147090A JP3007128B2 JP 3007128 B2 JP3007128 B2 JP 3007128B2 JP 2281470 A JP2281470 A JP 2281470A JP 28147090 A JP28147090 A JP 28147090A JP 3007128 B2 JP3007128 B2 JP 3007128B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- grain pattern
- surface layer
- molded article
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、柾目模様を有する発泡樹脂成形品の製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a foamed resin molded product having a straight grain pattern.
従来、この種の製造方法の一つに、特公昭58−9746号
公報記載のものがある。この製造方法では、第５図に示
すように、組成の異なるa,b2種の熱可塑性合成樹脂の少
なくとも一方の樹脂ａに発泡剤を含ませ、各樹脂a,bを
金型（１）内でシート状に拡げるとともに、互いに重ね
合わせて積層体（２）とした後、金型（１）内に設けた
多数の溝（３）により積層体（２）の樹脂ａ上に押出し
方向Ｅに向かう突条を多数形成し、この突条を金型
（１）の厚さ縮少部（４）で押し潰して、積層体（２）
を平坦にしながら金型（１）から押し出し、発泡させる
ことにより、縞模様のある発泡樹脂積層シート（５）を
製造している。Conventionally, as one of such production methods, there is one described in Japanese Patent Publication No. Sho 58-9746. In this manufacturing method, as shown in FIG. 5, a foaming agent is included in at least one of the two types of thermoplastic synthetic resins a and b having different compositions, and each resin a and b is placed in a mold (1). The sheet is spread in the form of a sheet and overlapped with each other to form a laminate (2). Then, the laminate (2) is extruded onto the resin (a) of the laminate (2) in the extrusion direction E by a number of grooves (3) provided in the mold (1). A large number of projecting ridges are formed, and the ridges are crushed by the reduced thickness portion (4) of the mold (1) to form a laminate (2).
Is extruded from the mold (1) while being flattened and foamed to produce a striped foamed resin laminate sheet (5).
しかし、上記従来の製造方法においては、樹脂ａの突
条が形成直後に押し潰されるので、必然的に歪が残り、
積層シート（５）が縞模様に沿って割損し易いという問
題があり、また、積層シート（５）の縞模様が画一的な
線からなる平坦なもので、凹凸や濃淡がないため、天然
の柾目とは程遠い縞模様しか得られないという問題があ
った。However, in the above-described conventional manufacturing method, since the ridge of the resin a is crushed immediately after formation, distortion is inevitably left,
There is a problem that the laminated sheet (5) is easily broken along the striped pattern. Also, since the striped pattern of the laminated sheet (5) is a flat line composed of uniform lines and has no unevenness or shading, it is natural. There was a problem that only a striped pattern far from the straight grain could be obtained.
本発明は、従来の製造方法を改良して、このような問
題点を取り除くことを目的とする。An object of the present invention is to improve the conventional manufacturing method to eliminate such a problem.
上記目的を達成するために、本発明の柾目模様を有す
る発泡樹脂成形品の製造方法は、組成の異なるA,B2種の
熱可塑性合成樹脂のうち少なくとも一方の樹脂Ａを発泡
性樹脂とし、金型内で樹脂Ａの成形体を押出し成形して
行き、この成形途中で、金型内に樹脂Ａの押出し方向と
実質的に直角にかつ横一列に設けた多数の異径の細孔か
ら表層形成用隙間を介して他方の樹脂Ｂを樹脂Ａの成形
体上にシート状に押し出すことにより、樹脂Ｂの表層を
樹脂Ａの成形体上に積層すると同時に、樹脂Ｂの表層に
樹脂Ｂの厚さの差により生ずる色の濃淡をもって柾目模
様を樹脂Ａの押出し方向に形成し、しかる後に金型から
押し出して樹脂Ａの成形体を発泡させるものである。In order to achieve the above object, the method for producing a foamed resin molded product having a straight-grain pattern according to the present invention is characterized in that at least one of the thermoplastic synthetic resins A and B2 having different compositions is a foamable resin, The molded body of the resin A is extruded and molded in the mold, and in the middle of the molding, the surface layer is formed from a large number of pores having different diameters provided substantially in a row and in a line substantially perpendicular to the extrusion direction of the resin A. By extruding the other resin B in a sheet shape onto the molded body of resin A through the forming gap, the surface layer of resin B is laminated on the molded body of resin A, and at the same time, the thickness of resin B is formed on the surface layer of resin B. A straight-grain pattern is formed in the direction of extrusion of the resin A with the shading of the color caused by the difference in height, and then extruded from a mold to foam the molded body of the resin A.
上記構成の製造方法においては、多数の異径の細孔か
ら押し出した樹脂Ｂは、表層形成用隙間内で樹脂Ａの押
出しに伴って樹脂Ａの成形体上に薄く拡がり、シート状
の表層として積層されると同時に、各細孔の直下で樹脂
Ｂの一部が多数の異幅の線条となって樹脂Ａ内に押し込
まれる。そのため、樹脂Ｂの表層には、樹脂Ｂの厚さの
差により色に濃淡が生じ、この濃淡が樹脂Ａの押出し方
向に柾目模様を形成するのである。このようにして得た
柾目模様は、従来のような歪が残留していないので、成
形品が柾目模様に沿って割損するおそれがなく、また、
色に濃淡があり、幅も異なるため、天然の柾目に極めて
近いものとなる。In the manufacturing method having the above-described configuration, the resin B extruded from a number of pores having different diameters spreads thinly on the molded body of the resin A along with the extrusion of the resin A in the gap for forming the surface layer to form a sheet-like surface layer. At the same time as being laminated, a part of the resin B is pushed into the resin A as a large number of lines having different widths immediately below each pore. Therefore, in the surface layer of the resin B, shading occurs in the color due to the difference in the thickness of the resin B, and the shading forms a straight grain pattern in the extrusion direction of the resin A. Since the grain pattern obtained in this way does not have the distortion as in the past, there is no risk that the molded article will be broken along the grain pattern,
Due to the different shades of color and the different widths, it is very close to the natural grain.
以下、本発明の一実施例を第１図〜第４図に基づいて
説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
本実施例は、第１図に示すように、組成の異なるA,B2
種の熱可塑性合成樹脂を使用し、金型（11）により柾目
模様を有する発泡樹脂成形品（20）（第４図参照）を押
出し成形しようとするものである。In this example, as shown in FIG.
This is to extrude a foamed resin molded product (20) (see FIG. 4) having a straight grain pattern using a mold (11) using various kinds of thermoplastic synthetic resins.
両樹脂A,Bのうち、少なくとも一方の樹脂Ａは発泡性
樹脂とし、樹脂Ｂは木材色に着色しておく。なお、樹脂
Ｂは発泡性、非発泡性のいずれでもよく、また樹脂Ｂを
発泡性とする場合でも両樹脂A,Bの発泡倍率は任意でよ
く、さらに、両樹脂A,B間に接着性さえあれば両樹脂A,B
の種類を問うものではない。具体的には、発泡性樹脂Ａ
としてはポリスチレン系樹脂、ポリエチレン、ポリプロ
ピレン等のポリオレフィン系樹脂、ポリアミド、ポリエ
ーテル、ポリ塩化ビニル等が挙げられ、また樹脂Ｂとし
てはスチレン−ブタジエンブロックポリマー、ハイイン
パクトポリスチレン等が挙げられる。尚、本発明の成形
品を箱用材料等に使用する場合には、樹脂Ｂとしてヒン
ジ性に優れたスチレン−ブタジエンブロックポリマーが
好適である。At least one of the resins A and B is a foamable resin, and the resin B is colored wood. The resin B may be foamable or non-foamable. Even when the resin B is foamable, the expansion ratio of the two resins A and B may be arbitrary. Both resins A and B if available
It doesn't matter what type. Specifically, foamable resin A
Examples thereof include polystyrene resins, polyolefin resins such as polyethylene and polypropylene, polyamides, polyethers, and polyvinyl chloride. Examples of the resin B include styrene-butadiene block polymers and high impact polystyrene. In the case where the molded article of the present invention is used as a material for a box or the like, a styrene-butadiene block polymer having excellent hinge properties is suitable as the resin B.
金型（11）は、内部に樹脂Ａの通路（12）と樹脂Ｂの
通路（13）とを有し、各通路（12）、（13）を別個の押
出し機（図示省略）に接続しておく。通路（12）は、第
２図に示すように、断面形状が成形しようとする所定の
形状（図示のものは台形）に先細りに形成されている。
また、通路（13）は、第１図および第３図に示すよう
に、通路（12）と略直角に設けてあり、出口側に多数の
異径の細孔（14）が横一列に形成され、表層形成用隙間
（15）を介して通路（12）に接続されている。The mold (11) has therein a passage (12) for resin A and a passage (13) for resin B, and connects each passage (12), (13) to a separate extruder (not shown). Keep it. As shown in FIG. 2, the passage (12) is tapered to a predetermined shape (a trapezoid in the drawing) to be molded.
As shown in FIGS. 1 and 3, the passage (13) is provided substantially at right angles to the passage (12), and a large number of pores (14) having different diameters are formed in a horizontal line at the outlet side. It is connected to the passage (12) through the gap (15) for forming a surface layer.
上記樹脂A,Bと金型（11）とから成形品（20）を押出
し成形するには、まず、樹脂Ａをその押出し機から通路
（12）内に供給し、樹脂Ａの半成形体（16）を押出し成
形して行く。次に、樹脂Ｂをその押出し機から通路（1
3）内に供給する。樹脂Ｂは、細孔（14）から押し出さ
れ、半成形体（16）の移動に伴って隙間（15）内で薄く
拡がってシート状となり、第４図に示すように、表層
（17）として半成形体（16）上に積層されると同時に、
各細孔（14）の直下において樹脂Ｂの一部が多数の異幅
の線条（18）となって半成形体（16）上に押し込まれ
る。そのため、表層（17）には、樹脂Ｂの厚さの差によ
り色に濃淡が生じ、この濃淡が樹脂Ａの押出し方向Ｘに
柾目模様（19）を形成する。In order to extrude the molded product (20) from the resins A and B and the mold (11), first, the resin A is supplied from the extruder into the passage (12), and the semi-molded product of the resin A ( 16) Extrude and go. Next, the resin B was passed from the extruder to the passage (1).
3) Supply within. The resin B is extruded from the pores (14), spreads thinly in the gap (15) with the movement of the semi-molded body (16), and becomes a sheet-like form, as shown in FIG. At the same time as being laminated on the semi-compact (16),
Immediately below each of the pores (14), a part of the resin B is formed into a number of lines (18) having different widths and is pushed onto the semi-molded body (16). Therefore, in the surface layer (17), the color is shaded due to the difference in the thickness of the resin B, and the shade forms a straight grain pattern (19) in the extrusion direction X of the resin A.
最後に、半成形体（16）を通路（12）から押し出して
発泡させ、第４図に示すような柾目模様（19）を有する
最後の発泡樹脂成形品（20）を得るのである。Finally, the semi-molded product (16) is extruded from the passage (12) and foamed to obtain a final foamed resin molded product (20) having a straight grain pattern (19) as shown in FIG.
なお、上記成形品（20）は、台形の断面形状を有する
ものについて説明したが、他の断面形状を有するものや
シート品等としてもよいことは勿論である。Although the molded product (20) has been described as having a trapezoidal cross-sectional shape, it is needless to say that the molded product (20) may be a product having another cross-sectional shape or a sheet product.
本発明は、以上説明したように、発泡樹脂Ａの成形体
上に積層した樹脂Ｂの表層に、樹脂Ｂの厚さの差により
生ずる色の濃淡をもって柾目模様を形成する。したがっ
て、柾目模様には従来のような歪が残留しておらず、そ
のため、成形品が柾目模様に沿って割損するようなこと
はない。また、柾目模様は、色に濃淡があり、幅も異な
るため、天然の柾目に極めて近いものとなる。According to the present invention, as described above, a straight grain pattern is formed on the surface layer of the resin B laminated on the molded body of the foamed resin A with the shading of the color caused by the difference in the thickness of the resin B. Therefore, no distortion is left in the grain pattern as in the prior art, so that the molded article does not break along the grain pattern. In addition, the straight grain pattern is very close to a natural straight grain because the color has different shades and different widths.
第１図は本発明の一実施例を説明するための押出し成形
用金型の一部省略断面図、第２図は第１図の左側面図、
第３図は第１図のIII−III線断面図、第４図は上記実施
例で得られた発泡樹脂成形品の一部省略斜視図、第５図
は従来の製造方法の一例を説明するための押出し成形用
金型の一部省略断面である。 11……金型、14……細孔 16……半成形体、17……表層 19……柾目模様、20……発泡樹脂成形品 Ａ……樹脂（発泡性）、Ｂ……樹脂 Ｘ……押出し方向（樹脂Ａ）FIG. 1 is a partially omitted cross-sectional view of an extrusion molding die for explaining an embodiment of the present invention, FIG. 2 is a left side view of FIG.
FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, FIG. 4 is a partially omitted perspective view of the foamed resin molded product obtained in the above embodiment, and FIG. 5 illustrates an example of a conventional manufacturing method. Is a partially omitted cross section of an extrusion molding die for use in the present invention. 11: Mold, 14: Pores 16: Semi-molded body, 17: Surface layer 19: Straight grain pattern, 20: Foamed resin molded product A: Resin (foamable), B: Resin X ... ... Extrusion direction (resin A)
Claims (1)
うち少なくとも一方の樹脂Ａを発泡性樹脂とし、金型内
で樹脂Ａの成形体を押出し成形して行き、この成形途中
で、金型内に樹脂Ａの押出し方向と実質的に直角にかつ
横一列に設けた多数の異径の細孔から表層形成用隙間を
介して他方の樹脂Ｂを樹脂Ａの成形体上にシート状に押
し出すことにより、樹脂Ｂの表層を樹脂Ａの成形体上に
積層すると同時に、樹脂Ｂの表層に樹脂Ｂの厚さの差に
より生ずる色の濃淡をもって柾目模様を樹脂Ａの押出し
方向に形成し、しかる後に金型から押し出して樹脂Ａの
成形体を発泡させることを特徴とする柾目模様を有する
発泡樹脂成形品の製造方法。1. A resin A of at least one of the two types of thermoplastic synthetic resins A and B having different compositions is a foamable resin, and a molded body of the resin A is extruded and molded in a mold. The other resin B is placed on a molded body of the resin A through a plurality of pores having different diameters provided in the mold substantially at right angles to the extrusion direction of the resin A and in a row in a row through a gap for forming a surface layer. By extruding the resin B, the surface layer of the resin B is laminated on the molded body of the resin A, and at the same time, a straight-grain pattern is formed on the surface layer of the resin B in the extrusion direction of the resin A with the shading of the color caused by the difference in the thickness of the resin B. A method for producing a foamed resin molded article having a straight-grained pattern, characterized in that the molded article of resin A is extruded from a mold and then foamed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2281470A JP3007128B2 (en) | 1990-10-18 | 1990-10-18 | Method for producing foamed resin molded article having a straight grain pattern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2281470A JP3007128B2 (en) | 1990-10-18 | 1990-10-18 | Method for producing foamed resin molded article having a straight grain pattern |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04153017A JPH04153017A (en) | 1992-05-26 |
| JP3007128B2 true JP3007128B2 (en) | 2000-02-07 |
Family
ID=17639635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2281470A Expired - Fee Related JP3007128B2 (en) | 1990-10-18 | 1990-10-18 | Method for producing foamed resin molded article having a straight grain pattern |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3007128B2 (en) |
-
1990
- 1990-10-18 JP JP2281470A patent/JP3007128B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04153017A (en) | 1992-05-26 |
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