JP2779807B2 - Composite board and method of manufacturing the same - Google Patents

Description

The present invention relates to a composite board and a method for producing the same. (Conventional technology) Conventional composite plate materials are joined by applying pressure with a press or rolling between columnar rolls, with or without applying an adhesive during the overlap of the plate materials. (Problems to be solved by the invention) The composite plate material, such as a veneer plate, has improved the isotropy by improving the difference between the properties in the length direction and width direction of the plate material. However, in consideration of the fact that these materials often break obliquely due to shear stress, the length direction of the blank rather crosses the length direction of the product, and the fiber or It is desirable that crystals are aligned, but there was no method for producing such a composite plate, and there was no such composite material. In addition, composite plate materials, such as clad plates, are made into a single plate by combining materials of different materials in an attempt to obtain better performance and manufacturing costs than a single homogeneous material. In this case, the finishing width of the composite plate was almost equal to the raw plate width, and a wide raw plate was necessary to obtain a wide composite plate, and preparation of the raw plate was not easy. A first object of the present invention is to provide a composite plate material in which a plate is stiffened diagonally and a method for producing the same. A second object of the present invention is to provide a wide composite board and a method for producing the same. (Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. (1) As shown in FIG. 1, FIG. 2 and FIG.
Is a method of manufacturing a composite plate material comprising a first step of helically winding a circular pipe 2A and a second step of flattening the circular pipe and joining the inner surface. Fig. 1 shows a circular pipe from strip 1A
The first step of manufacturing 2A is shown. In the example shown in this figure, a double tube is formed because the strips are overlapped by half. In this case, the product after rolling is a four-layer composite plate in which the length direction of the material intersects each other around the center of the composite plate. When forming into a circular tube, as shown in Fig. 2,
Instead of overlapping 1A, the sides may be butt-joined. In this case, the product after rolling is a two-layer composite plate in which the length directions of the material intersect each other. When the strip 1A is made into a circular pipe, it is sufficient that both strips can be handled as one, and it is not necessary to join them together. For example, as shown in FIGS. 3 and 5, a plate-like material 1A having substantially the same width and a band-like material 1C having a joining function are wound at different positions in the width direction, and both are wound by a band-like material 1C having a joining function. It may be kept tubular. If the strip 1C having this joining function is configured to have a joining function on both sides,
A composite pipe can be made by winding another strip around the outer surface of 2C. To form the strip 1A into a spiral shape, FIGS.
As shown in the figure, at least three bending roll sets 5A, 5B,
5C and preferably a sizing roll 6 are provided. The step of flattening the circular pipe is not particularly limited, but it is preferable to press it with a press tool set 7 as shown in FIG. 6, for example. Of course, it can be flattened by the rolling roll set 8. The flat material 3 is pressed by a press tool set 7 as shown in FIG. 6 to join the inner surfaces, or is continuously rolled between rolling roll sets 8 as shown in FIG. 7 or FIG. To join the inner surfaces. At this time, to facilitate joining,
Inserting a material having a joining function inside, applying an adhesive to the inner surface, heating the flat material,
It is better to take any of the measures of raising the temperature of the roll set 8 and the rolling rolls. Fig. 7 shows an example of rolling with the circumferential direction of the pipe in the advancing direction, and Fig. 8 shows an example of rolling with the length direction of the pipe in the advancing direction. hand,
Either or both can be used together. (2) Further, as shown in FIGS. 1 to 5, the present invention comprises a first step of spirally winding a band-shaped material 1A into a circular tube 2A, and FIGS. 9 to 10 thereof. As described above, the belt-shaped material 1B is spirally wound around the outer surface of the circular tube 2 in the opposite direction.
A third step of cutting the circular tube 2 thus obtained to obtain a plate-like body 4, and a fourth step of rolling the plate-like body 4 thus obtained into a flat product. This is a method of manufacturing a composite board made up of the steps and the composite board manufactured in this way. The outer tube 2A and the inner tube 2B have a joining strength that does not separate when cut, or the ends are stopped with fasteners and joined by rolling so that the overlapped material does not decompose. Others are as described in (1). (Operation) By configuring as described above, it is possible to produce a composite plate in which the length direction of the strip is inclined at a predetermined angle with respect to the length direction of the composite plate. Strips are generally anisotropic, strong in the length direction and weak in the width direction. Such anisotropy occurs in the longitudinal direction of the composite plate.
The reinforcing fibers, crystal grains or crystals are inclined in the direction in which the maximum shear stress acts on the tensile force applied in the longitudinal direction or the width direction of the composite plate, that is, at an angle of 45 degrees to the tensile stress. Most preferably, the grains are arranged vertically. Further, according to the present invention, a composite plate having a width wider than the width of the band as a material can be obtained by forming the band into a spiral shape. For example, if the width of the plate is W and its length is inclined at 45 or 60 degrees to the length of the tube, the width of the composite plate will be 1.4 in each case by cutting along the length of the tube. W and 2.0W. (Example 1) On the basis of the technique described in the above (1), as a band-shaped material, a 50 mm width slion tape was applied, with its adhesive surface inside, and as shown in FIG. Were stacked and spirally wound into a circular tube, which was then pressed to form a composite plate. This composite board consists of four layers, the width of which is 35mm, and the slant of the slion tape in the length direction is about 45 degrees.
Degrees. A notch of 5 mm perpendicular to the tensile direction was made in this composite material, and the tensile strength in the length direction and the width direction was determined. For comparison, the same slion tape was made into four layers with the length direction aligned, and the same notches were made to determine the tensile strength in the length and width directions. Assuming that the tensile strength in the width direction of this composite plate is 1, its tensile strength in the length direction is 1.2, and the tensile strength of the obliquely laminated composite plate is the same in both the length method and the width direction. It was remarkably high at 4.5. (Example 2) Based on the technique described in the above (1), a thin paper material having an adhesive applied to one side of a strip-shaped cardboard material is adhered to the belt-shaped cardboard material while the tape-shaped cardboard material of FIG. 3 and FIG. In the same manner, a spiral pipe was formed by displacing it in the width direction and spirally forming a circular pipe. After applying glue to the inner surface of the circular pipe, it was flattened by pressing, and the inner surface was joined to obtain a composite paper board. (Example of embodiment) Based on the technology described in the above (2), the thickness is 1.0 mm and the width is 1.0 mm.
A 100 mm polypropylene strip is spirally wound as shown in Fig. 1 while being heated to about 120 to 160 ° C, and joined and bent while the overlapping portion is pressed with a roll braided tube to form a circular tube. As shown in FIG. 9, the same polypropylene strip as described above is heated to 120 to 160 ° C. and spirally wound in the opposite direction on the outer surface of the pipe to join the two strips together. The ring is cut in the length direction to make a plate, and the plate thus obtained is heated to 120 to 160 ° C and rolled into a flat plate to obtain a polypropylene composite plate. (Effects of the Invention) Since the present invention is configured as described above, the following effects can be obtained. In other words, the difference between the properties in the length direction and width direction of the plate material can be improved, and the isotropy can be improved. In particular, composite plates that can prevent the development of fracture due to maximum shear stress that intersects the width direction or length direction, and composite plates that are reinforced diagonally to the plate can be manufactured. Also, various wide composite plates can be obtained from a small number of raw plates. According to the present invention, it has become possible to manufacture a composite plate having fibers or crystal grains which cross each other in the longitudinal direction of the composite plate. Such a composite plate has excellent material properties not found in a conventional plate or a composite plate, and can be used alone or as a band-shaped material to be overlapped with a conventional plate. The method of the present invention can be applied to any material that can be bent. In other words, it can be applied not only to metal materials and polymer materials, but also to inorganic materials that can be bent and joined, wood and food materials, and composites of these different materials. In addition, a composite material containing reinforcing fibers or a material in which anisotropy is emphasized by rolling or extrusion can be used for the strip material of the present invention.

[Brief description of the drawings]

1 to 10 are explanatory views of the present invention. FIGS. 1 to 5 show a case where a strip is formed into a circular tube, FIG. 6 shows a case where a circular tube is flattened, and FIG. Fig. 8 and Fig. 8 show the case where the flat material is rolled, and Figs. 9 and 10 show the case where the strip material is wound around the inner pipe. 1,1A, 1B, 1C: Strip, 2,2A, 2B, 2C: Circular tube, 3: Straight, 4: Plate, 5A, 5B, 5C: Roll set, 6: Rolling roll, 7: Press tool set, 8: Roll roll set, 9: Presser roll.

Claims (4)

(57) [Claims] 1. A method of manufacturing a composite plate comprising a first step of spirally winding a strip material into a circular pipe and a second step of flattening the circular pipe and joining the inner surface. 2. A composite plate produced by the method according to claim 1. 3. A first step of spirally winding the strip into a circular tube, and a second step of spirally winding the strip on the outer surface of the circular pipe in the opposite direction and joining the two strips. A method for producing a composite plate material comprising a third step of cutting the circular tube thus obtained to obtain a plate-like body and a fourth step of rolling the plate-like body thus obtained into a flat plate. 4. A composite plate produced by the method according to claim 3.