CS252398B1 - One-sided molded fibreboard and its manufacturing method - Google Patents

Abstract

The essence of the solution is the creation of a thatch from at least two layers of soft non-pressed wood fiber thatch or blanks from coniferous raw material, pressed into a compact and one-sided shaped thatch. The production method consists in the fact that the whole formats or blanks of the described material are placed on top of each other and pressed without using binders and additives at temperatures of 170 to 230 °C, pressure of 2.0 to 6.0 MPa and a pressing time of 3 to 15 minutes.

Description

The invention is. relates to a one-sided shaped fibreboard and to its manufacturing process. The well-known molded fiber fibrelas produced by the existing processes on large-capacity lines in large quantities allow only the narrowed shape range to be produced. The described method is known in Austria, but it is disadvantageous for further use. A further method using the molding of high duromer and plastomer preforms, used in Germany, eliminates the drawbacks of the first method in the variability of molding designs, but requires increased material costs for plate manufacture.

The disadvantages of the prior art described above are eliminated by the one-sided molded fibreboard according to the invention, which is based on the fact that it is formed from at least two layers of soft non-pressed fibreboard or coniferous blankets pressed into a compact and one-sided molded thatch. The essence of the manufacturing process is that the whole formats or cuts of non-pressed non-molded fibre thatched from the coniferous raw material are stacked in at least two layers between the molded tools of the hydraulic press and pressed without using binders and admixtures at temperatures of 170 to 230 ° C, pressure of 2.0 to 6.0 MPa and a pressing time of 3 to 15 minutes. Advantages of the process according to the invention consist in the possibility of producing one-sided molded parts without the need for low-cost machine equipment, even in simple hydraulic presses without the need for expensive additives. The higher effect of the invention is the wide variation in shape of the moldings, even in small quantities, according to consumption. The process according to the invention can be implemented directly with the producers of the final products, which thus obtains a new material according to the requirements of the designer. Example 1

Two soft, non-pressed 15 mm thick fibreboard or spruce blankets are placed on top of one another and placed between the die and the die mold, which is fixed in the hydraulic press. Without the use of binders and admixtures, they are pressed at 180 ° C, pressure of 3.5 MPa for 14 minutes. A one-sided molded board with a thickness of 8 mm and a density of 750 kg / m 3 is produced. P r i k l a d 2

Three soft 15 mm thick non-pressed fibreboard assemblies are folded into a set without further treatment so that the two outer layers are spruce raw material and the middle layer is made of edible raw material. The set is inserted between the molded dies of a hydraulic press and compressed at 220 UC, 5.0 MPa and a molding time of 4 minutes without the use of binders and admixtures. A one-sided molded board with a thickness of 11 mm and a density of 850 kg / m3 is produced.

The shape of the press mold can be arbitrary according to the requirements of the customer. The depth of the profile depends on the number of layers of soft non-pressed fibreboard thatch in its thickness.

The one-sided molded fibreboard according to the invention can be used in woodworking companies in furniture production, in the building industry, in wooden house interiors and the like.

Claims (2)

OBJECT CLAIMS 1. A one-sided molded fibreboard having a mean bulk density of 700 to 900 kg / m 3, characterized in that it is formed from at least two layers of soft non-pressed fibreboard or coniferous blanks pressed into a compact and one-sided molded layer. 2. A method for producing a one-sided molded fibreboard according to claim 1, wherein the whole or the non-molded softwood fibrous thatch sections are stacked in at least two layers between the molded hydraulic press tools and pressed without use. binders and admixtures at temperatures of 170 to 230 degrees Celsius, pressures of 2.0 to 6.0 MPa, and compression time of 3 to 15 minutes.