JPH10296729A - Recycling method of top board of steel desk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively recycle a decorative sheet by a method wherein the end part of the decorative sheet is peeled off from the basic plate (the steel part) of a top board and further by moving the basic plate under the state being pinched between a pair of rotary rolls so as to peel off the decorative sheet from the basic plate with a wedge-like blade ahead the rolls. SOLUTION: With a device, in which two or an upper and a lower rolls are arranged and, further, ahead the rolls, a wedge is arranged, a surface decorative sheet is easily and safely separated from a top board heated up to 120-160 deg.C in a short period of time. As a general easy method for heating the top board, a heating device equipped with a sheathed heater is employed. In the heated top board, one end part of the surface decorative sheet is separated with a vacuum spark, a chisel or the like. In succession, a wedge-like blade 6 is inserted so as to pinch the basic plate (the steel part) of the top board between a pair of or the upper and lower rolls in order to separate the decorative sheet 1 by moving the top board through the rotation of the rolls. The separated decorative sheet is broken or crushed to proper sizes normally with a crushing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling old and discarded steel desks and, more particularly, to a method for recycling decorative surface boards.

[0002]

2. Description of the Related Art The top plate of a steel desk is usually decorated with a thermosetting resin decorative plate. Therefore, the easiest way to dispose of old discs is to crush them with a crusher into shredder dust. However, in this method, the top plate portion occupying half of the steel desk cannot be treated as iron scrap as it is, and the decorative surface plate has no choice but to burn and is not recycled effectively.

[0003] A steel desk can be divided into a top plate portion and a foot portion. The feet are made of painted iron and are pressed or crushed to reduce volume and treated as scrap iron. The top plate cannot be processed as iron scrap as it is because the decorative plate is adhered. Therefore, a method of subjecting the top plate to high temperature treatment or shredder dust followed by heat treatment to burn and remove the decorative plate portion is generally used. In such a method, the steel part of the top plate can be treated as scrap iron, but the decorative plate part is not effectively recycled.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a method of effectively recycling these by separating a decorative surface from a top plate of a steel desk and separating a resin portion and a metal portion. .

[0005] The steel desk has a structure that can be easily separated from a top plate portion and a foot portion (including a drawer portion of a saddle). Further, the top plate is provided with a thermosetting resin decorative plate, mainly a hard melamine resin decorative plate, bonded to the surface thereof using a rubber adhesive. Because rubber adhesives are used, even old steel desks can be easily separated by heating and peeling off the decorative surface at high temperatures.

[0006]

That is, according to the present invention, a top plate of a steel desk surface-decorated with a thermosetting resin decorative plate is heated, and then an end of the decorative plate is attached to a top plate (steel plate). ), And further removing the decorative plate from the substrate with a wedge-shaped blade in front of the roll while moving the substrate between a pair of rotating rolls. Things.
The decorative plate part thus separated is pulverized to an appropriate size so that it can be recycled for energy or material, and the metal part is treated as iron scrap.

The rubber-based adhesive can be peeled off by heating for a long time even at 100 ° C. or lower. However, in order to work efficiently, it is preferable to heat to 120 ° C. to 160 ° C. on the surface decorative plate surface. Top plate is made of iron or aluminum and thermosetting decorative board with good heat resistance.
Even if it is heated to 160 ° C., it does not deform or deteriorate as a top plate. The work of peeling the decorative board from the top plate can also be performed manually using a rag or a spatula. However, since most of the top plate is made of iron, the temperature drops quickly and
At high temperatures of 20 to 160 ° C, manual work is dangerous and difficult.

The present invention uses an apparatus having two upper and lower rolls and a wedge in front of the rolls, and easily and safely peels a decorative surface plate from a top plate heated to 120 to 160 ° C. in a short time. is there. 200 ° C for heating the top plate
A method using an electrothermal box-type constant temperature drier that is raised to a degree, a method of sandwiching between two hot plates heated to about 180 ° C. through high-pressure steam, and the like can be performed, but the most common and easy method is This is a method using a heating device equipped with a sheath heater as shown in FIG. In FIG. 1, 1 is a decorative surface of a top plate, 2 is a steel portion of the top plate,
Reference numeral 3 denotes a sheath heater for heating, 4 denotes a heat insulating cover, and 5 denotes a transport device.

Next, FIG. 2 shows an example of a device combining a wedge and a pair of rolls for peeling a decorative plate from a top plate. The heated top plate is peeled at one end of the surface decorative plate with a vacuum svac, a rag, or the like, and then a wedge-shaped blade 6 is inserted, and a pair of upper and lower rolls 7 is attached to the top plate substrate (steel portion).
The decorative plate 1 is peeled off while the top plate is moved by rotating the roll with the 2 sandwiched. The peeled decorative board is usually crushed or crushed to an appropriate size by a crusher.

As a crushing method, the size can be easily reduced to about 1 cm square by using a biaxial roll crusher or the like. It can also be cut to a width of about 5 cm with a circular saw for woodworking or the like and made into a square of about 0.5 cm with a hammer mill. This crushed material can be used as fuel, and can be used for cement production and the like. Further, the separated decorative board is finely pulverized with a turbo mill or a ball mill, so that the decorative board can be used as a part of a filler of a phenolic resin molding material, for example, to enable material recycling. Further, the steel part of the top plate from which the decorative plate has been peeled can be treated as iron scrap as iron scrap like the foot.

According to the present invention, after the top plate is heated, the surface decorative plate can be efficiently peeled off using a device combining a wedge and a pair of rolls. It can be treated as iron scrap,
The face decorative board can also be effectively recycled for energy or material.

[0012]

【Example】

[Example 1] The old steel desk top plate was removed, and the surrounding edges were also removed. The plate was heated and removed for 5 minutes in a 150 ° C electric hot-air circulating box-type fixed dryer, and then vacuum vacuumed. Peel off one end of the decorative board from the top plate with
The decorative plate was peeled off while the top plate was moved while the tip of a wedge-shaped blade was inserted between the rolls and sandwiched between a pair of rolls. Separation of the decorative board could be performed very smoothly. After cooling, the separated decorative board was roughly pulverized with a biaxial roll crusher, medium-pulverized with a hammer mill, and then finely pulverized with a ball mill for 20 hours. The powder processed in this manner was sieved with a 100-mesh net, and as a result, almost passed the 100-mesh net. This decorative board powder was replaced with wood flour in an amount corresponding to 10% of the total weight of the wood powder-containing phenolic resin molding material. Using this molding material and performing test molding together with the original phenolic resin molding material, the appearance and performance were the same.

Example 2 A steel desk was dismantled in the same manner as in Example 1, and a top plate was prepared. This top plate was placed in a heating furnace equipped with a sheath heater, and heated so that the surface temperature became 140 ° C. in one minute. One end of the decorative plate was peeled off from the heated top plate with a rag. Thereafter, in the same manner as in Example 1, the decorative plate portion was separated from the top plate. The stripped steel part was recycled as scrap iron. The peeled decorative plate was cut into a ribbon having a width of 5 cm after cooling, and was crushed by a hammer mill. This crushed decorative panel has a heating value of 50
It was as high as 00 kcal / kg, and was sufficiently usable as a fuel, particularly a fuel for cement production.

[0014]

According to the method of the present invention, the steel portion and the decorative plate portion of the top plate can be easily and efficiently separated. By crushing or pulverizing the decorative plate portion, material recycling or energy recycling is easy. At the same time, the steel part is easily recycled as iron scrap.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one example of a heating method.

FIG. 2 is a schematic cross-sectional view showing an example of a peeling device in which a wedge-shaped blade and a pair of rolls are combined. 1 Surface decorative plate of a top plate 2 Steel portion of a top plate 3 Sheath heater for heating 4 Heat insulation cover 5 Transport device 6 Wedge-shaped blade 7 A pair of rolls 8 Driving motor

Claims (4)

[Claims] 1. A top plate of a steel desk whose surface is decorated with a thermosetting resin decorative plate is heated, and then an end of the decorative plate is peeled off from a substrate (steel portion) of the top plate. A method of recycling a steel desk top plate, wherein a decorative plate is peeled off from a substrate with a wedge-shaped blade in front of the roll while being sandwiched and moved by a rotating roll. 2. The method according to claim 1, wherein the thermosetting resin decorative board is a hard melamine resin decorative board. 3. The method according to claim 1, wherein the separated decorative board is crushed. 4. The method according to claim 1, wherein the separated decorative board is finely pulverized and used as a filler for a phenolic resin molding material.