JPH03180340A - High-molecular material rolled plate of three layer and manufacture thereof - Google Patents

Abstract

PURPOSE:To form excellent surface properties, and to increase strength by placing between outer layers a high-molecular material plate containing a specific quantity of reinforcing fibers and rolling a blank, both surfaces of which are composed of a normal high-molecular material plate and which has three layer structure, in the two direction. CONSTITUTION:In a high molecular material having three layer structure, an outer layer 1 consists of a normal high molecular material used for improving surface properties such as polypropylene, and an inner layer 2 is made up of fiber reinforced plastics containing not more than 40wt.% glass fibers, carbon fibers, ceramic fibers, etc., having strength such as polypropylene + glass. The high molecular material is rolled in one direction in a temperature range just under the melting point of the high molecular material, and the direction of rolling is changed at 90 deg.C and rolling in the two directions is conducted. Accordingly, strength isotropy is acquired at the same stretch ratio in an inner layer material having reinforcing fibers and an outer layer material as a pure high molecular material, no reinforcing fiber is exposed on a surface, and an excellent surface state equal to a general pure resin is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plate-shaped product of a polymeric material having a three-layer structure obtained by rolling and a method for manufacturing the same.

[Prior Art] It is known that rolling a polymeric material containing reinforcing fibers further increases its strength. For example, JP-A-57-57627 discloses a rolled polyester sheet containing reinforcing fibers. This polymeric material rolled plate is produced by rolling an unstretched polyester sheet containing 50% by weight or less of a linear reinforcing material in one direction with a roll to a stretching ratio of 1.5 or more, and then in a direction perpendicular to the rolling direction. It is obtained by rolling a sheet to a stretching ratio of 1.2 or more. In this polymer material rolled sheet, the reinforcing fibers are arranged on a plane, and the tensile strength in the second rolling direction increases (however, the tensile strength in the direction perpendicular to the rolling direction is not described. do not have,).

However, since the polymer material rolled plate manufactured by this prior art is obtained by rolling a fiber-containing resin, it has the disadvantage that reinforcing fibers are exposed on the surface and the appearance is extremely poor.

[Problems to be Solved by the Invention] In view of the above points, the present invention has been developed by inserting a polymeric material plate containing reinforcing fibers into a three-layer structure material in which both sides are made of ordinary polymeric material plates. The purpose of this work is to provide a rolled sheet of polymeric material that is unidirectionally rolled, eliminates the strength anisotropy caused by unidirectional rolling, has excellent surface properties, is high in strength, and is isotropic in strength, and a method for producing the same. It is.

[Means for Solving the Problems] The present invention is characterized by comprising an inner layer of a polymeric material containing 1.40% by weight or less of reinforcing fibers and an outer layer of a pure polymeric material. 2. A three-layer polymer sheet consisting of an inner layer of polymer material containing up to 40% by weight of reinforcing fibers and an outer layer of pure polymer material is A method for producing a three-layer polymeric material, which comprises rolling and stretching in one direction at a temperature just below the melting point of the molecular material, and then rolling and stretching in a direction perpendicular to the rolling direction.

Hereinafter, the present invention will be explained in detail based on the drawings.

The inventors created a three-layer structure (outer layer 1: a normal (pure) polymer material used to improve surface properties, such as polypropylene,
Inner layer 2: A polymeric material containing a fiber-reinforced plastic containing strong glass fibers, carbon fibers, ceramic fibers, etc. (for example, polypropylene + glass fibers) is first heated in one direction at a temperature just below the melting point of the polymeric material. Rolled,
Next, a rolling experiment was conducted in which the rolling direction was changed by 90'' and rolling was performed in the second direction.

3 in the figure indicates a roll. Note that during rolling, tension may be applied to the material as necessary for improving the shape, rolling stability, etc. As a result, as shown in FIG. 3, within the scope of the present invention, even if the reinforcing fibers and the molecular chains of the polymer itself are oriented in the rolling direction due to rolling in one direction, they are not stretched in the second direction. It has been found that if the ratio is set to around 2, strength isotropy can be obtained at the same stretching ratio as the inner layer material having reinforcing fibers and the outer layer material which is a pure polymer material. Furthermore, as a result of detailed examination of the rolled plate, we found that even if the reinforcing fibers and the molecular chains of the polymer itself were once oriented in the rolling direction, they were heated again to near the melting point and rolled in the second direction. By adding a We found that the amount can be obtained. Here, the rolling ratio between the inner layer material containing reinforcing fibers and the total thickness of the material is defined as φ (φ - rolling ratio of inner layer material/rolling ratio of three-layer material).

The adhesive force between the outer layer and the inner layer is sufficient because compressive stress is applied in the thickness direction by rolling, and even if elongation deformation is applied, no separation between the outer layer and the inner layer is observed until the inner layer ruptures.

As for the surface quality of the rolled plate, since the outer layer is made of pure resin, there are no reinforcing fibers exposed on the surface, and it exhibits an excellent surface condition equivalent to that of general pure resin.

[Example] The material is the following (total thickness 20mm, width 300mm.

(length 500mm) heated to 140℃, outer diameter 300m
Next, the rolled plate was cut in the width direction using a one-way mill (temperature 120°C) and rolled in 6 passes until the plate thickness was 4.0 mm. Then, the sheet was rolled to a thickness of 2.7 mm in 3 baths. At that time, the rolling reduction ratio φ between the inner layer and the total plate thickness was 96.3%.

The tensile strength of the rolled plate is 8.1 kgf/mm2 in the rolling direction,
The direction at 90° with the rolling direction is 8. 0 kgf/mm2, which is significantly increased compared to 4.2 kgf/mm'' of the material, and the strength is isotropic.

The surface of the rolled plate showed an excellent surface condition equivalent to that of pure resin.

Outer layer: polypropylene, -layer thickness h so = 1
．． 0mm inner layer: polypropylene glass fiber (
Diameter 10μm, length 100μm, fiber content 10% by weight
), plate thickness hco=18.0+am [Effects of the Invention As described above, according to the present invention, a fiber-reinforced rolled polymer material having good surface properties, high strength, and isotropic strength can be produced. There is an effect that can be achieved.

4. Brief explanation of the figures Figure 1 is a diagram showing an outline of the manufacturing method in the present invention, Figure 2
The figure shows the behavior of rolling in the present invention, Figure 3 shows the strength characteristics of a plate rolled in two directions according to the present invention, and Figures 4 (a) and (b) show the inner layer of the rolled plate in the present invention. It is a figure which shows the rolling reduction ratio of and the total plate thickness.

1... Outer layer of rolled material 2... Inner layer of rolled material 3
... Roll and 4 others Figure: Tensile strength σ (kgf/nr+++2) 1 to 10 Figure: Rolling temperature: 140°C (a) (b) Stretching ratio λ of second direction rolling.

Claims (1)

[Claims] 1. A three-layer rolled polymeric material consisting of an inner layer of a polymeric material containing 40% by weight or less of reinforcing fibers and an outer layer of a pure polymeric material, stretched and oriented in two orthogonal directions. Board. 2 A three-layer polymer sheet consisting of an inner layer of polymer material containing 40% by weight or less of reinforcing fibers and an outer layer of pure polymer material was rolled and stretched in one direction at a temperature just below the melting point of the polymer material. A method for producing a three-layer polymer material, which is then rolled and stretched in a direction perpendicular to the rolling direction.