JPH0617066B2 - Three-layer polymer material rolled plate and method for producing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plate-like product of a polymeric material having a three-layer structure obtained by rolling and a method for producing the same.

[Prior Art] It is known that when a polymeric material containing reinforcing fibers is rolled, its strength is further increased. For example, Japanese Patent Application Laid-Open No. 57-57627 discloses a rolled sheet of a polyester sheet containing reinforcing fibers. This rolled sheet of polymeric material is a polyester sheet containing 50% by weight or less of a linear reinforcing material. The unstretched sheet is rolled by a stretch ratio of 1.5.
It is obtained by rolling in one direction as described above, and then rolling the sheet at a draw ratio of 1.2 or more in a direction perpendicular to the rolling direction. Thus, in this polymer material rolled plate, 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. Absent.). However, since the rolled polymer material plate manufactured by this prior art is obtained by rolling the fiber-containing resin, it has a drawback that the reinforcing fibers are exposed on the surface and the appearance is remarkably poor.

[Problems to be Solved by the Invention] In view of the above points, the present invention provides a material having a three-layer structure in which a polymer material plate containing reinforcing fibers is inserted and both surfaces thereof are ordinary polymer material plates. It is made for the purpose of providing a polymer material rolled plate having high strength and isotropic strength, which is excellent in surface properties, and has strength anisotropy removed by unidirectional rolling. is there.

[Means for Solving the Problems] A feature of the present invention is that it is composed of 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, and is in two orthogonal directions. 2. Rolled sheet of polymer material with three layers stretched and orientated in 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 A method for producing a three-layer polymer material is characterized by rolling and stretching in one direction in a temperature range 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 described in detail with reference to the drawings.

The inventors of the present invention have found that the rolling method shown in FIGS. 1 and 2 has a three-layer structure (outer layer 1: an ordinary (pure) polymer material used for improving the surface texture, such as polypropylene,
Inner layer 2: A polymer material having a fiber-reinforced plastic containing strong glass fiber, carbon fiber, ceramics fiber, etc. (for example, polypropylene + glass fiber) is first unidirectionally heated in a temperature range just below the melting point of the polymer material. Rolled and
Then, a rolling experiment was conducted in which the rolling direction was changed by 90 ° and rolling in the second direction was performed. In the figure, 3 indicates a roll. In addition, at the time of rolling, if necessary, such as improvement of shape and stability of rolling,
Tension may be applied to the material. As a result, as shown in FIG. 3, within the range of the present invention, even if the reinforcing fibers and the molecular chains of the polymer itself are oriented in the rolling direction by rolling in the first direction, stretching is performed in the second direction. It has been found that if the ratio is around 2, the strength and isotropy can be obtained at the same stretch ratio as the inner layer material having the reinforcing fibers and the outer layer material which is a pure polymer material. Furthermore, as a result of detailed examination of the rolled plate,
As shown in the figure, even if the molecular chains of the reinforcing fiber and the polymer itself are oriented in the rolling direction once, they are heated to near the melting point again, and if a reduction is applied in the second direction, they are reinforced with the outer layer material that is a pure polymer material. It has been found that the plate thickness ratio with the fiber-containing inner layer material can be rolled at the same plate thickness ratio as before rolling in the second direction (both the inner and outer layers can obtain the necessary stretching amount for strengthening). Here, the reduction ratio of the inner layer material containing the reinforcing fibers and the total thickness of the material is defined as φ (φ = reduction rate of inner layer material / reduction rate of three-layer material).

The adhesive force between the outer layer and the inner layer is sufficient because compressive stress acts in the plate thickness direction by rolling, and even if a deformation of elongation is applied, the outer layer and the inner layer are not separated until the inner layer is broken.

Regarding the surface properties of the rolled plate, since the outer layer is a pure resin, the reinforcing fiber is not exposed on the surface, and the rolled plate shows an excellent surface state equivalent to that of a general pure resin.

[Example] The following materials are used (total thickness 20 mm, 300 mm, length 500 mm)
Was heated to 140 ° C., and was rolled by a 6-bath in one direction to a plate thickness of 4.0 mm using a roll having an outer diameter of 300 mm (temperature 120 ° C.).
Next, the rolled plate was cut in the width direction and rolled in the second direction (changing the rolling direction by 90 °) in three passes to a plate thickness of 2.7 mm. At that time, the reduction ratio φ between the inner layer and the total plate thickness was 96.3
%Met.

Tensile strength is the rolling direction 8.1kgf / mm ² of rolled sheet, the rolling direction and 90 ° direction is 8.0 kgf / mm ^2, greatly increased compared to 4.2kgf / mm ² of the material, the strength and the like It is one.

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

Outer layer: polypropylene, thickness of one layer h so = 1.0 mm Inner layer: polypropylene + glass fiber (diameter 10 μm, length
100 μm, fiber content 10% by weight), plate thickness h co = 18.0 mm [Advantages of the Invention] As described above, according to the present invention, a fiber having good surface properties, high strength and isotropic strength. It has the effect of producing a reinforced rolled polymeric material.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a manufacturing method in the present invention, and FIG.
FIG. 4 is a diagram showing rolling behavior in the present invention, and FIG. 3 is a strength characteristic of a sheet rolled bidirectionally according to the present invention.
Drawings (a) and (b) are figures showing the rolling reduction ratio of the inner layer of rolling plate and total plate thickness in the present invention. 1 ... Outer layer of rolled material, 2 ... Inner layer of rolled material, 3 ...
roll

Claims (2)

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