JPS60135209A - Method and device for 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〕 The present invention relates to a method for decolorizing a veneer and an apparatus therefor.

[Background technology]

BACKGROUND ART Wood with wood grains expressed on its surface has traditionally been used favorably as interior material for houses. However, using a large amount of natural wood as the surface material (veneer) would be very expensive, so generally, building materials with artificial decorative veneers pasted on the surface are mainly used. This artificial decorative veneer is made as follows. In other words, wood veneers obtained by rotary slicing are degreased, bleached, and then dyed.
The obtained dyed veneer is laminated with adhesive and pressure molded to obtain an assembled flitch, which is then sliced.

Among these processes, decolorization is performed using hydrogen peroxide (hereinafter referred to as H2O
This is done by immersing the wooden veneer in a decolorizing bath containing a decolorizing agent such as 2).

By the way, since H2O2 tends to self-decompose, the concentration of H2O2 is 0.
．． The concentration of a 5-1.0% decolorizing solution decreases to 0% by the next morning, with almost no decolorizing effect. Leaving it as is is a waste of decolorizing agent. To take advantage of this,
It is best to immerse the veneer in a decolorizing tank and return it after production.

However, since the pn of the decolorizing solution is high, if the veneer is immersed in the decolorizing tank for a long time at night, there is a problem that the veneer will be burnt by alkali.

[Purpose of the invention]

This invention was made in view of these circumstances,
The purpose is to prevent alkaline burning of the veneer which occurs when decolorizing the veneer at night, and to effectively utilize self-decomposing H2O2.

[Disclosure of the invention]

The inventor made extensive studies to achieve the above object. As a result, this invention was completed.

This invention involves decolorizing a veneer using a decolorizing solution with a high pH. After immersing the veneer in a decolorizing tank, the veneer is pulled up before alkaline burn occurs on the veneer, then immersed in a hot water washing tank, pulled up, and left to stand. The first point is a decolorizing method for veneers, which is characterized by automatically performing the following steps: a decolorizing tank and a hot water washing tank are installed side by side, and a ceiling above which a basket for storing the veneers is suspended. A crane is installed, and the overhead crane moves between the decolorization tank and hot water washing tank and operates to immerse the basket in the decolorization tank and hot water washing tank, and the decolorization tank is connected to the decolorization liquid storage tank via a pump. The second point is a decolorizing device for veneer, in which the operation of the overhead crane and pump is controlled by a timer. less than,
Embodiments will be described in detail based on the accompanying drawings.

FIG. 1 shows a decolorizing device for veneer according to the present invention. As shown in the figure, the veneer decolorization device 1 includes a decolorization solution 2a.
A decolorizing tank 2 containing water and a hot water washing tank 3 containing hot water 3a are arranged side by side. Above the decolorization tank 2 and the hot water washing tank 3, an overhead crane 5 is arranged to suspend a basket 4 for storing veneers. An electric winch truck 8 is suspended from a rail 6 extending above the decolorizing tank 2 and above the hot water washing tank 3 via a car 7 so as to be movable. An overhead crane 5 is installed on this truck. Limit switches 9a and 9b are provided at both ends of the rail 6. The limit switches 9a and 9b are activated when the overhead crane 5 makes contact with each contact position LS-1,
The overhead crane 5 is stopped by LS-2. A wire rope 11 is wrapped around the pulleys 10a and 10b of the overhead crane 5, and the basket 4 is wrapped around the pulleys 10a and 10b of the overhead crane 5.
b, and moves up and down as shown by the arrow, so that the built-in veneer can be immersed in the decolorizing tank 2 and hot water washing tank 3. A decolorizing liquid storage tank 14 is connected to the decolorizing tank 2 via a pipe 12 and a pump 13. A decolorizing liquid 2b is stored in the decolorizing liquid storage tank 14, and the decolorizing liquid 2b is stored in the decolorizing liquid storage tank 14.
can be replenished by a pump 13. A liquid level gauge 15 for controlling the liquid level is attached to the decolorizing liquid storage tank 14. The operations of the overhead crane 5 and the pump 13 are configured to be controlled by a timer.

In such a configuration, decolorization and @washing are performed as follows.

After the production is finished, the required amount of veneers that have been degreased and the like are stored in a basket 4. The automatic control device is started, and the overhead crane 5 is moved to the left and stopped at the LS-1 position. Next, the overhead crane 5 is operated to lower the basket 4 and immerse it in the decolorization tank 2. At this point, timer NOI is activated. In this case, it is important to lift the veneer before the veneer is scorched by the alkali contained in the decolorizing solution. Normally, the safe decolorization time that does not cause alkali burn is about 3 hours. However, this varies depending on the decolorizing solution and the tree species. Next, when the decolorization time reaches the time limit, the overhead crane 5 is operated to raise the basket 4 and lift it out of the decolorization tank 2. In addition, the stop position control of the overhead crane 5 when the basket 4 is raised to the highest level and lowered to the lowest level in the above operation is performed at positions LS-3 and L.
Based on the limit switch installed on S-4. Next, the overhead crane 5 is moved to the right and stopped at the LS-2 position. Next, the overhead crane 5 is operated to lower the basket 4 and immerse it in the hot water washing tank 3. Here timer No.2
When the basket is activated and immersed for one hour, time is up, and the overhead crane 5 is activated to raise the basket 4 and lift it out of the hot water washing tank 3. In this state, start timer No. 3 and leave it for about 12 hours. Decolorization and hot water washing are completed with the operations up to this point.

After this, preparations will begin for decolorization, which will be done during the day shift. In other words, 30 minutes before the start of the day's work, the time-up occurs, and the pump 13 starts operating to fill the decolorizing liquid storage tank 14.
The decolorizing liquid 2b inside is replenished to the decolorizing tank 2. The liquid level is level gauge 1
When the pump 13 descends to position 5b, the pump 13 stops and replenishment is completed. The liquid level gauge 153 is for upper limit detection. after that,
The overhead crane 5 is moved to the left and stopped at the LS-1 position. When the operations up to this point are completed, the automatic control device stops, and preparations for the nighttime decolorization work and the day's decolorization work are completed.

Such bleaching work and preparation work speeds up the morning start-up work, making it possible to improve the efficiency of the bleaching work. After that, the operator measures the color of the treated veneer, and based on the color measurement results, bleaches the color as usual for the required time.

〔Effect of the invention〕

This invention involves decolorizing a veneer with hydrogen peroxide by immersing the veneer in a decolorizing tank and then pulling it out before alkali burn occurs on the veneer, then immersing it in a hot water washing tank, pulling it out, and leaving it alone. Since we are trying to do this automatically,
Treated veneers do not develop alkali burn. Moreover, the self-decomposing H2O2 can be effectively utilized even at night.

〔reference〕

Conventionally, wastewater used in the process of producing carpentry wood has been subjected to water treatment (#collection and sedimentation treatment, biological treatment) or evaporation treatment before being discharged. However, since the waste liquid contains a sufficient amount of usable active ingredients, in such a case where there is a large waste of water and active ingredients, the following procedure should be taken.

In other words, a reverse osmosis device is used to treat the wastewater needed to produce artificial precious wood. This device cuts high molecular weight substances (dyes, wood extracts, etc.) with a permeable membrane, but low molecular weight substances (such as penetrants contained in dyes, such as ethylene glycol) penetrate just like water. It passes through the membrane. Furthermore, by changing the treatment pressure (osmotic pressure), the amount of permeation of low molecular weight substances can be adjusted. Therefore, this reverse osmosis device is used to cut out unnecessary substances such as dyes whose color has changed and wood extracts using an osmotic membrane. If the resulting treated water is reused in the production of artificial precious wood, it is possible to reduce the amount of ethylene glycol used in dyeing along with water.In this way, recycling the treated water into the process contributes to resource conservation. It becomes.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a veneer decolorizing apparatus according to the present invention. 1... Veneer decolorization device 2... Decolorization tank 3... Hot water washing tank 4... Basket 5... Overhead crane 8.
...Winch cart 9a, 9b...Limit switch 10a, 10b...Electric pulley 13...Pump
14...Decolorizing liquid storage tank 15a, 15b...Liquid level gauge agent Patent attorney Takehiko Matsumoto

Claims (2)

[Claims] (1) When decolorizing a veneer using a high pH decolorizing solution,
Decolorization of a veneer, characterized in that the veneer is immersed in a decolorization tank and then pulled up before alkaline burn occurs on the veneer, then immersed in a hot water washing tank, pulled up, and then left to stand. Law. (2) A decolorizing tank and a hot water washing tank are installed side by side, and an overhead crane is installed above the tank to suspend the basket that stores the veneers.The overhead crane moves between the decolorizing tank and the hot water washing tank. The basket is immersed in a decolorization tank and a hot water washing tank, and a decolorization liquid storage tank is connected to the decolorization tank via a pump.
This is a veneer decolorization device where the operation of the overhead crane and pump is controlled by a timer.