JPS6011306A - Method of decoloring veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 This invention relates to a method for decolorizing veneers.

[Background technology]

Generally, decorative boards, which are often used as interior building materials, are made by attaching thin boards with wood grains, that is, veneers, to plywood. Since natural veneers are difficult to obtain due to resource depletion, artificial veneers have been developed. This product is usually obtained by slicing a rotary veneer or a flitch assembly of rotary veneers, decolorizing the laminated sliced veneer, dyeing it, laminating it to obtain a flitch, and slicing this product. It will be done. For decolorization, after applying an alkaline solution to the veneer, cure it for about 24 hours to allow the alkaline solution to penetrate, then apply a hydrogen peroxide solution and cure it for more than 4 hours in an atmosphere at a temperature of 40℃ and 5℃. A method has been developed to do this. Conventionally, a curing method was used that applied steam after applying a hydrogen peroxide solution to enhance the decolorizing effect, but with this method, the longer the steam curing time, the more discoloration would occur, making it difficult to control the curing time. To avoid this, the k,Fi12 method was developed. However, in order to increase processing efficiency with this method, if a large number of veneers coated with hydrogen peroxide solution are loaded in excess of a certain number and cured for a long period of time, hydrogen peroxide will form on the veneers near the center in the loading direction. Since the heat of decomposition is accumulated and the temperature reaches a high temperature, the decomposition of hydrogen peroxide progresses too much, resulting in discoloration.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for decolorizing veneers that can cure a large number of veneers on nails without causing any color curdling.

[Disclosure of I6 Ming]: G3 and I have conducted extensive studies to achieve the above objectives and have completed this invention.

This invention is a method for decolorizing veneers in which m-boards coated with a decolorizing liquid are loaded and cured, in which a large number of veneer boards are piled up with gaps provided between each veneer laminate not exceeding a certain number. The gist is a method of decolorizing veneers, which is characterized by curing. Hereinafter, an embodiment thereof will be described in detail based on the accompanying drawings.

Figure 1 shows an example of the method for decolorizing a veneer according to the present invention.
This is a side view of the model. First, an alkaline solution is applied to the material veneer, and the solution is cured for about 24 hours (for example, left to stand) to allow the solution to fully penetrate. Next, a hydrogen peroxide solution, which is a decolorizing solution, is applied. After that, the temperature is 40±
In an atmosphere of 5℃, as shown in Figure 1, the veneer l
. . . are divided into a certain number of sheets (maximum number without causing discoloration) and stacked, and then piled up and cured with a lump 2 . . . interposed between them. In the diagram, 3
is the gap between each laminate.

In the method of decolorizing veneers according to this invention, there are no special limitations on the method of applying alkaline solution or hydrogen peroxide solution.
For example, the coating may be performed using a roll coater or by spraying. Furthermore, there are no particular restrictions on the time or temperature for curing.

In the example, the method of creating a gap between the veneers was to interpose a lump between the veneers, but the method is not limited to this, and the method is such that the veneers are stacked separately on several shelves, etc. I don't mind.

In the veneer decolorization method according to the present invention, the fixed number of veneers means the maximum number of veneers that will not cause discoloration, but this number varies depending on the thickness and area of the veneer.

In the embodiment, the veneers are piled up with a gap between each fixed number of veneers, but the veneers may be stacked with gaps between each veneer of a fixed number. An example of the decolorization method for veneer and two comparative examples using the conventional decolorization method are listed, and each tJ4.47j
The measurement results of the color tone of the middle girders in the center of the laminate are shown in Figure 4.
゜〔1! ) l:i ('IJ) A veneer with a frame width of 5110 rm and a J depth of 1.0 was coated with alkaline i'fIk, cured for 24 hours, and then coated with a hydrogen peroxide solution. Next, 4()℃, humidity 10
In an atmosphere of 0 ton, as shown in Figure 2 (a), 1300 veneers 1... were loaded on each shelf of shelves 4 and 4.4 for 24 hours. After curing, decolorizing veneer was applied. In the diagram, 3 is 1'! :! , there is an interval C.

[Comparative Example 1] Length: 5 (10 mrrr, thickness: 1) The alkaline solution was completely applied to the veneer of the () gate, and after curing for 24 hours, a hydrogen peroxide solution was applied. Subsequently, a hydrogen peroxide solution was applied at 4 ()°C. In an atmosphere with a humidity of 100℃, 100 veneers l... were loaded on the shelf 4, as shown in Fig. 2 (b), and after curing for 24 hours, the decolorized veneers were Obtained.

[Comparative Example 2] Length and width 500 am % thickness 1. An alkaline solution was applied to an Otm veneer, and after curing for 24 hours, a hydrogen peroxide solution was applied. Next, 40°C, humidity Ifto.

In a cloudy atmosphere, as shown in Figure 2 (C),
Thirty () pieces of veneer 1... were loaded on shelf 4, and after curing for 24 hours, a bleached veneer was obtained.

[Measurement results J (ri=10) Examples and Comparative Example 1 are within the standard values, but Comparative Example 2
was outside the standard value.

[Effects of the Invention] As described above, the method for decolorizing veneers according to the present invention is a method for decolorizing veneers in which veneers coated with a decolorizing liquid are stacked and cured. It is characterized by the fact that each veneer laminate is cured in a stacked state with gaps that do not exceed This brings about the effect that a large number of veneers can be cured at once without causing any rebound.

[Brief explanation of the drawing]

FIG. 1 is a model side view of one embodiment of the veneer decolorization method according to the present invention, and FIG. 2 shows another embodiment of the veneer decolorization method according to the present invention and a conventional veneer decolorization method. FIG. 3 is a side view of a comparative example based on a decolorization method as a model. 1...Single board 3...Gap agent Patent attorney Takehiko Matsumoto Figure 1

Claims (1)

[Claims] (1) In the veneer decolorization method, in which veneers coated with a decolorizing solution are stacked and cured, a large number of veneers are stacked with gaps between each veneer laminate, not exceeding a certain number, and cured. A method for decolorizing veneer.