JPS6147708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes an endless belt such as a steel belt to form one or more unfoamed polyurethane foam raw materials and polyisocyanurate foam raw materials between the surface material and the sheet material. The present invention relates to a method for manufacturing a composite plate of a predetermined shape by reacting and foaming the raw material while moving in a mold.

Recently, composite plates in which a synthetic resin foam such as polyurethane foam or polyisocyanurate foam is interposed as a core material between front and back materials have been commercially available. Particularly, as the back material, a flexible sheet material made of one or more of kraft paper, asbestos paper, aluminum foil, and synthetic resin film is used. In order to manufacture this type of composite board, the sheet-like material is guided to the mold entrance via a plurality of guide rollers, and along the way, the raw material that will become the core material reacts and the temperature reacts during foaming. Because it is a major factor in foaming,
It was necessary to install a device to heat the sheet material. Moreover, at the entrance of the mold, the sheet-like material is guided far in front of the mold members facing each other, and is then fed into the mold facing each other, so that the raw material that will become the core material is discharged from the nozzle etc. onto the back side of the facing material. The distance to the mold entrance is long, and the air that exists between the core material raw material during reaction and foaming with the back side of the sheet material is trapped because the foaming of the raw material is not uniform, and this causes reaction heat in the mold. As a result, it expands, forming voids in the foamed structure, and has the drawback of causing protrusions and peeling due to gas accumulation between the sheet-like material and the core material.

In order to eliminate these drawbacks, the present invention places a sheet-like material over a mold member that is heated at room temperature and guides it to the mold entrance, and also heats it, and eliminates the inclusion of air to create a homogeneous material. The present invention provides a method for manufacturing a composite plate using a foam structure and without installing a guide or a shade device before the mold entrance.

EMBODIMENT OF THE INVENTION Below, the manufacturing method of the composite board based on this invention is demonstrated in detail using drawings. FIGS. 1a and 1b are explanatory diagrams showing only the main parts of an apparatus used for carrying out the present invention. 1 and 2 are crown cross-sections as shown in Fig. 1b, so-called medium-height drive wheels; 3 and 4 are driven wheels with crown cross-sections; 5 and 6 are upper and lower mold members; 7 and 8 are auxiliary wheels; 9 is a 10 is a raw material feeder for synthetic resin foam, 11 is a reel, 12 is a conveyance roll, A is a surface material, B is a sheet-like material, and C is a raw material for a core material. To explain further, the upper mold member 5 is wound between the driving wheel 1 and the driven wheel 3, and the lower mold member 6 is wound between the driving wheel 2 and the driven wheel 4 like an open belt, and the upper mold member
The lower mold members 5 and 6 form a mold 9 with a constant interval, and are configured to dissolve at the exit of the mold 9. The upper and lower mold members 5 and 6 are made of flat steel belts, and the auxiliary wheels 7 and 8 are placed above the area where the upper and lower mold members 5 and 6 face each other and form the mold 9.
This is provided to contact the back surfaces of the lower mold members 5 and 6 to maintain the above-mentioned distance constant. Furthermore, a synthetic resin foam raw material feeder 10 (hereinafter simply referred to as a feeder) is for spraying, mixing, and discharging raw materials for polyurethane foam and polyisocyanurate foam onto the back surface of the surface material A. It is. The surface material A is a coiled metal plate that is formed into the cross section shown in FIGS. 2 and 3 using a molding machine (not shown), and is fed to the feeder 10. The sheet-like material B is made of one of the above-mentioned flexible materials.

Next, a method for manufacturing a composite plate according to the present invention will be explained. Now, in order to manufacture a composite plate as shown in FIG. 4 heated to about 70° C., the upper and lower mold members 5 and 6 are rotated in the direction of the arrow, and a mold 9 with a spacing t is formed at the entrance. A 0.27 mm steel plate is formed into a cross section as shown in Figure 2 and fed as the surface material A, and the raw material C for the core material is mixed from the feeder 10. It is assumed that the core material raw material C in an unfoamed state is discharged onto the back surface of the surface material A. Therefore, when the surface material A at the entrance of the mold 9 reaches the layered core material C in a state where it has been foamed and expanded to a certain extent, the sheet-like material B is transferred from the reel 11 to the upper mold member 5.
It is brought into contact with at least 1/2 of the chord outer circumference of the mold entrance end and guided by static friction, and is heated to about 70°C by the upper mold member 5 and comes into contact with the core raw material C at the mold entrance. do. At this time, the core material raw material C was considerably foamed and had a volume that was in contact with the back surface of the sheet-like material B, and was in a state in which no air was incorporated at the entrance of the mold 9. Then, in the mold 9, all the voids in the mold 9 are filled with the core material C, and the reaction and foaming are apparently completed while being regulated by the upper and lower mold members 5 and 6, and from the exit, a thickness of t is reached. Continuously delivered to the composite plate.
Note that the sheet-like material B is guided and fed at a speed that is synchronized with the upper and lower mold members 5 and 6 with no speed difference.

As described above, according to the method for manufacturing a composite plate according to the present invention, a sheet-like material that is easy to break is placed on a temperature-sensitive core material material by at least 1/2 the length of the chordal outer peripheral surface of the inlet end of the upper mold member. Because the core material is guided, heated, and fed by direct contact with the core material, voids are not generated in the foam structure of the core material, and peeling between the core material and the sheet material does not occur. It has the feature of being able to manufacture composite plates without any protrusions. Additionally, there is no need for guide rollers or heating devices at the sheet-like material and the mold entrance end, making it possible to manufacture composite plates at low cost and smoothly.

[Brief explanation of the drawing]

1a and 1b are explanatory diagrams showing the main parts of an apparatus used for carrying out the method for manufacturing a composite plate according to the present invention;
3 are explanatory diagrams showing an example of a surface material, and FIG. 4 is an explanatory diagram showing an example of a composite plate manufactured by the above method. 1, 2... Drive wheel, 3, 4... Driven wheel, 5...
Upper mold member, 6... Lower mold member, 9... Mold, A... Surface material, B... Sheet-like material.

Claims (1)

[Claims] 1 A steel belt is wound in an open belt shape between the driving wheel and the driven wheel, both of which have a crown cross section, and a surface material is placed in the space between the lower die members.
An unfoamed polyurethane foam raw material or polyisocyanurate foam raw material is laminated in this order into a sheet-like material, and the above raw materials are reacted and foamed in a mold to press and mold these constituent materials and fix them together. In manufacturing the plate, the sheet-like material is brought into direct contact with at least 1/2 of the chordal outer circumference of the mold entrance end of the upper die member wound around the outer periphery of the driven wheel, and is heated and guided. A method for producing a composite board, characterized by bringing it into contact with a raw material.