CS246268B1 - A method for producing molded laminated wood panels - Google Patents

Abstract

The method of producing shaped laminated wood parts, which have the same or horizontally variable thickness, consists in the shaping pressing of part blanks heated to the melting temperature of the used binder, which takes place in a cold mold, whereby the part blanks were obtained by dividing and processing a flat plate pressed in presses for flat pressing at a temperature corresponding to the used thermoplastic binder.

Description

The invention relates to a method for producing laminated wood moldings.

Molded laminated wood panels for furniture and the like are made by molding in molds from sets of veneers by one-step cold or hot technology, depending on the type of binder used. The technology of cold production is not suitable for industrial purposes due to the need for long pressing times, the need for a large number of pressing molds and for considerable work-in-progress. Hot production technology requires complex heated molds or the use of generators to cure the binder by high frequency heating. A common disadvantage of both technologies is the very limited possibility of molding in larger molds sets of larger sizes, from which a larger number of pieces of the same shape could be obtained by cutting. This increases the need for additional machining allowances and consequently the consumption of veneers and adhesives. Another disadvantage of these technologies is the fact that all operations associated with further machining and finishing of parts can be performed on preformed moldings, thus increasing labor and often requiring special machines and equipment.

The above-mentioned drawbacks are eliminated by the process for the production of shaped parts according to the invention, which consists in the fact that a set of veneer splices with veneer or solid wood inserts of the required number of layers, the width or length of which is multiple into a planar plate, then divided into billets of parts which after partial or complete processing and after heating to the temperature at which the thermoplastic binder used becomes plastic, are pressed in unheated form into shaped pieces of the desired shape; For heat pressing the heat accumulated in the components is used when pressing the assembly into a flat plate.

The method for producing the shaped parts according to the invention has the following advantages:

Surface compression in the composite format reduces the relative size of machining allowances and thus the consumption of veneers and binders. By performing the predominant proportion of operations required for machining prior to forming, the laboriousness of these operations and the need for special machines and equipment are reduced. Molding in unheated molds simplifies mold construction and reduces the cost of ownership.

The method of manufacturing laminated wood moldings according to the invention consists in applying the two-stage technology according to the scheme shown in Figs. 1 and 2. Veneer splices 1, the width and length of which can be multiply fabricated moldings, are compressed in a set of required layers. use of a suitable type of thermoplastic binder (dispersion, foil, etc.) in the shape of a planar plate 2. Pressing can be performed on commonly used single or multi-stage veneer or plywood presses for flat pressing at temperatures corresponding to the type of thermoplastic binder used. its individual layers; the pressing time depends on the type of binder, the thickness of the assembly and the pressing temperature as in conventional wood pressing. Depending on the need, it is also possible to perform surface treatment, for example by pressing the decorative foil, etc. After pressing, the surface of the planar plate 2 can be machined by grinding, varnishing, etc. edges, eg by milling, grinding, etc., taking advantage of the flatness of their surfaces. After partial or complete machining, the billets of the panels 3 are heated to a temperature at which the thermoplastic binder used becomes plastic and, after complete heating, are compressed in the cold mold to the desired shaped pieces 4 under appropriate pressure. the length of the pressing time depends on the cooling rate of the compact. In the case of panels of greater thickness with little time required for their machining in the planar state, the heat accumulated during sheet pressing is used for shaping, so that additional heating is not required. The method of manufacturing laminated wood moldings according to the present invention makes it possible to produce panels whose thickness varies in the length direction. To this end, veneer or solid wood inserts 5 need to be inserted in the designated veneer or solid wood panels prior to flat pressing, as shown in the diagram in Fig. 2.

The process for producing laminated wood moldings according to the invention can be applied not only in large-scale production, but also with regard to low purchase costs in the production of small-series and piece production, in the production of models and prototypes.

Claims (3)

Method for producing laminated wood moldings, characterized in that a set of veneer splices of the required number of layers, the width or length of which is multiple of the dimensions of the fabricated parts, are pressed into a planar board using a thermoplastic binder, then divided into blanks The parts which, after partial or complete processing and after heating to the temperature at which the thermoplastic binder used becomes plastic, are pressed in unheated form into shaped parts of the desired shape. vynalezu 2. A method according to claim 1, characterized in that the heat accumulated in the panels during the flat pressing of the assembly is used to mold the billets of the panels in unheated molds. 3. A method according to claim 1, characterized in that inserts of veneer or solid wood are placed in a set of veneer splices prior to sheet pressing. 2 sheets of drawings