JPS59217487A - Method and device for removing content moisture in 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 The present invention relates to a method and apparatus for removing moisture contained in a veneer veneer, which mechanically removes moisture contained in the wood structure (mainly conduits and tracheids) of the veneer.

Conventionally, regarding techniques for mechanically removing moisture contained in Bekoya veneer (hereinafter referred to as veneer) rather than by evaporation drying, various inventions have been made, including JP-A-48-'49995 filed by the present applicant. Proposed. However, these inventions all squeeze out the moisture content by compressing and deforming the veneer, and have the advantage that they can be processed in a shorter time with extremely less energy than evaporative drying using a dryer. However, this method had the drawback that the compressive deformation of the veneer caused plastic deformation and breakage of the W plate. In other words, in order to increase the amount of moisture removed, it is necessary to increase the rate of compressive deformation of the veneer, which ultimately places an excessive load on the wood structure.
This leads to a significant decline in the quality of manufactured plywood. Therefore, in reality, the rate of deformation could not be increased to that extent, and therefore, the amount of water that could be removed could not be satisfactory.

Human inventions should overcome such product defects.The first invention was to utilize the pressure of compressed gas, and the conduit, which is usually a wood structure, was formed on the front and back sides of a veneer cut with veneer lace. By spraying compressed gas onto at least one of the grain surfaces of the veneer being transported by applying MLI to the pipe located diagonally so as to open to the grain surface of both boards (see conduit q in Figure 9). , characterized in that moisture contained in the wood structure is removed.

Next, the second and 34th inventions of the present invention relate to an apparatus for implementing the above-mentioned first contained moisture removal apparatus,
The second r start is due to the drop in the veneer during transportation)
A device for removing moisture contained in a veneer veneer that can blow compressed gas onto one second surface, that is, a compression device equipped with a veneer conveyance mechanism and jet holes formed in series or intermittently in a direction transverse to the conveyance direction. a gas blowout device, a gas compressor communicating with the compressed gas blowout device, and a plywood veneer support member that is provided at a position facing the compressed gas blowout device and supports a veneer plate onto which the compressed gas is blown from the opposite side. The third invention is a device for removing moisture contained in a veneer veneer comprising: a device for removing moisture contained in a veneer veneer, which sprays compressed air onto the grain surfaces of both the front and back surfaces of a veneer veneer during transportation; , a veneer transport mechanism, a pair of compressed gas jetting devices that are arranged opposite to each other across a transporting path and are equipped with jetting holes that are formed in series or intermittently in a direction transverse to the transporting direction; and the pair of compressed gas jetting devices. This is a device for removing moisture contained in a veneer veneer, consisting of a gas compressor that communicates with the veneer.

An example of implementation of the present invention will be described below with reference to the drawings.

Fig. 1 shows an embodiment of a device for removing moisture contained in a veneer, which sprays compressed air on the grain surface (hereinafter referred to as the "board surface") on the - side of the veneer.
．． 1.1', 1' transport the veneer P in the same direction as the fiber direction. A support roller 3 as a veneer support member is rotatably provided below the veneer transport path by the transport roller, and a box-shaped box is provided above the veneer transport path at a position facing the support roller 3. A compressed air blowing device 2 is installed oppositely.

A near compressor 4 is connected to the compressed air blowing device 2, and a compressed air blowing hole 2a opening in a direction perpendicular to the conveying direction is provided in the sliding member 4 on the conveying path side. The spout hole 2a is formed in the shape of a slit with a length that is approximately the same as the width of the veneer being conveyed, but the length may be longer or shorter than the width of the veneer, and its shape may also vary depending on the opening. It may also be of a type in which sections are disposed intermittently. As shown in the figure, the jet hole 2a is in contact with the support roller 3 and the lower surface of the veneer P. l! By arranging it so that the edge of the ejection hole 2a on the carry-in side is located above the contact part X (strictly speaking, in the contact part Since the contact part This allows the removed moisture to be constantly pushed out to the carry-in side, thereby preventing it from penetrating into the veneer on the carry-out side again. In other words, the discharge side of the jet hole 2a is in a closed state because the support roller 3 and the veneer P are in contact with each other as described above, and therefore, the removed moisture can escape together with the compressed air from the jet hole 2a, which has an escape space. This means that they will be pushed further towards the import side. Further, the support roller 3 may be either free-rotating or driven, but it has rubber 3a on its circumferential surface.
If covered, it becomes possible to transport the veneer P using only the support roller 3, and the area of the contact portion X increases, which also has the effect of blocking compressed air and contained moisture from entering the discharge side of the jet hole 2a. It increases.

Next, FIG. 2 shows a box-shaped compressed air jet with a compressed air relief surface 2"b formed on the inlet side of the jet hole 2'a, instead of the box-shaped compressed air jet device 2 in FIG. 1. 2 shows an embodiment with a device 2';

This relief surface 2'b is provided to further enhance the effect of forming the relief space, and its shape is determined by various factors such as the material and thickness of the veneer, the conveyance speed, and the pressure of compressed air. Although it varies depending on the factors, in the illustrated embodiment in which the width (in the conveyance direction) of the jet hole 2''a is 2 mm, it is formed as a gentle slope.Instead of this slope 2'b,・ Level difference of about 0.2mm, i.e. jet hole 2
The sliding surface on the carry-in side of ``a'' is 0.
The same effect can be expected even if the flat surface 2''b is formed about 2 mm higher. (See FIG. 3) FIG. 4 shows an embodiment in which a veneer support stand 5 is used as the veneer support member. In this embodiment as well, a relief surface 2'b is formed on the compressed gas ejection device 2'' so that an escape space for the compressed gas is created on the inlet side of the ejection hole 2''a.
In order to further enhance the effect of this relief space, a relief surface 5b is similarly formed on the veneer support base 5. However, this flank 5b is formed so as to be inclined toward the carry-in side, not from the carry-in side edge of the ejection hole 2°b, but from the carry-out side edge.

Next, FIG. 5 shows a hollow compressed gas jet device with a large number of jet holes bored in its circumferential surface, which is used in place of the compressed gas jet devices 2.2'' and 2'' in FIGS. 1 to 4. The ejection roller 6 is rotated by a drive device (not shown) in synchronization with the rotation of the support roller 3 (or in synchronization with the rotation of the conveyance roller when the veneer support member is a support base). ), and a valve 7 is provided in the spout hole 6a on the circumference so that the compressed gas inside is spewed out only when external pressure (for example, contact with a veneer) is applied to the spout hole 6a on the circumference. As shown in the cross-sectional view of Fig. 6, the valve 7 mainly includes a cylindrical valve box 7a, a valve stem 7b, a rubber packing 7C attached to the tip of the valve stem, and the rubber packing 7c. It consists of a spring 7d that presses against the valve seat, and is screwed into a large number of appropriate places on the roller peripheral wall.When the veneer P is inserted between the jetting roller 6 and the support roller 3, these valves 7 To be exact, the plate surface of the single plate P contacts the tip of the valve stem 7b, the valve stem 7b moves inward against the elasticity of the spring 7d, and the compressed air inside the roller flows from the gap between the valve seats to the outer shell. At this time, in order to stabilize the amount of compressed air ejected, it is desirable to cover each valve 7 with a cap 8 shown in FIG. It is the same as that in Fig. 1, and the same reference numerals as in Fig. 1 indicate the same parts.In addition, in both Figs. ``2'', 6 is,
The veneer support members 3.5 are arranged below the conveyance path, but the positions of the two may be opposite to the conveyance path, or the conveyance path itself may be vertical or It is also possible to take it in a diagonal direction and arrange the respective devices on both sides.

Figures 8 to 10 show an embodiment of the third invention, in which a pair of compressed air blowing devices are installed across a conveyance path to blow compressed air onto both the front and back surfaces of the veneer being conveyed. are set up opposite each other.

Figure tfJ8 shows box-shaped compressed air blowing devices 9 with blowing holes 9a provided on the conveyance path side, which are arranged vertically at intervals slightly smaller than the thickness of the veneer P. Both devices 9 and 9 have near compressor 4.
．． 4 are connected. Inside the jet hole 9a of the compressed air jet device 9, there is a hole larger than the opening of the jet hole 9a,
It is equipped with a rod-shaped body 9b made of urethane rubber that is slightly longer in length, and in particular, in the lower compressed air jetting device, a U-shaped elastic support 9 is provided so that the rod-shaped body 9b closes the jetting hole 9a even under normal conditions.
c is built in, and the rod-shaped body 9b is placed on the elastic support body 9c. (See Figure 8) In this device, the rod-shaped body 9b is pressed against the nozzle hole 9a by compressed air and the elastic support 9c, and the nozzle hole 9a is always closed. When the veneer P is inserted between the ejection devices 9.9, the rod-shaped body 9b is pushed toward the delivery side and pushed into the box.
A gap is created between the ejection hole 9a and the loading side of the rod-shaped body 9b,
Compressed air will be blown out from the gap.

Next, Fig. 10 shows a pair of compressed air ejection devices in which the rotatable ejection rollers 6 (see Figs. 5 and 6) are installed vertically opposite each other, and which also serves as a conveying means for the veneer. It can be said that it is a moisture removal device. The internal structure of the ejection roller 6 is as described above, so a description thereof will be omitted here.

The apparatus of the present invention is constructed as described above, and carries out the method of the present invention as follows.

In other words, when the intermediate board sent by the conveyance mechanism reaches the compressed gas jetting device, compressed gas is sprayed from the jetting holes onto the surface of the veneer, and as a result, the compressed gas is released into the wood structures such as conduits and radial tissues. The water content is removed from the surface of the veneer. At this time, in the case of a moisture removal device in which a compressed gas jetting device is arranged only on one side of the conveyance path, it is desirable to insert the compressed gas twice on each side, and in order to do this at the same time, the removal device should be inserted twice.
It is possible to use a stand arrangement (of course, the positions of the compressed gas jetting devices are arranged alternately), or a moisture removal device equipped with a pair of compressed gas jetting devices. Also, the method of inserting the veneer should be such that the surface of the plate where the outlet opening of the inclined conduit is located (for example, the top surface of the veneer P in Fig. 9) faces the compressed gas jetting device side, and the direction of the fibers is It has been confirmed that if the compressed gas is inserted in the same direction, the moisture removed by the compressed gas is pushed through the conduit to the delivery side, improving the moisture removal efficiency. In the case of a moisture removal device, compressed air is blown onto both the front and back surfaces of the veneer at the same time, so there is no need to check the condition of the surface of the veneer as described above, but simply to check the direction of the fibers. It is convenient because the removed moisture is always pushed toward the loading side just by inserting it in the direction.

Incidentally, with the apparatus shown in Figure $8, larch wood with a thickness of 3 mm and an initial moisture content of 150% became about 70% moisture content.

Furthermore, if the gas to be ejected is not just air but hot air or water vapor, the resin in the wood structure will also be melted by the heat and pushed out of the veneer, leading to problems with poor adhesion when bonding the veneers together. will be resolved all at once. Similarly,
It is very convenient to spray air or steam mixed with chemicals such as preservatives, or even the vapor of the chemicals themselves such as preservatives, eliminating the need for reprocessing. The higher the pressure of the compressed gas, the higher the efficiency, but usually 3 kg/cm" (
Experiments have confirmed that the practical limit is around 1 kg/cm2 (atmospheric pressure).

Next, to explain the application aspect of the present invention, before removing the contained moisture according to the present invention, there are no scratches or scratches on the surface of the veneer to be inserted.
It may be possible to treat the small cracks. In a veneer that has been treated for these scratches, compressed air is supplied from the scratches to the wood tissue inside the veneer, achieving more effective moisture removal. These scratches are made using a gun roll, a knife, a needle, etc., but the scratches must not penetrate to the front or back of the veneer. In addition, as seen in the formation of the escape space, the pressure on the inlet and outlet sides of the nozzle hole is changed, that is, the pressure on the inlet side is lower than the pressure on the outlet side to effectively move the removed water. However, it is also possible to force this pressure difference by using a pressure reducing device.

The present invention, as described below, uses veneer lace to
Focusing on the fact that in most of the veneers that are cut, the conduits are inclined to the root surface, but the conduits are always open on both the front and back surfaces, we blow away the moisture present in the conduits. This method is based on the idea of drying using heat, and is fundamentally different from evaporative drying using heat or the like. Therefore, a large amount of water can be removed with low calorie consumption, and the surface and necessary equipment can be downsized, greatly contributing to rationalization and labor saving in the plywood manufacturing process.

[Brief explanation of the drawing]

1 to 5, 8 and 10 show examples of the device for removing moisture contained in a veneer according to the present invention.
Fig. 4 is a partially cutaway front view of the contained moisture removing device with only the box-shaped compressed air blowing device in cross section, Fig. 5 is a perspective view of the contained moisture removing device equipped with a blowing roller, and Fig. 6 is the blowing out device. An explanatory diagram of a valve screwed onto the peripheral wall of a roller, FIG. 7 is a perspective view of a cap that covers the valve, and FIG. 8 is a diagram of a contained moisture removal device with only a pair of box-shaped compressed air blowing devices disposed opposite each other as a cross section. FIG. 9 is a partially enlarged view of the ejection hole in FIG. 8, and FIG. 10 is a perspective view of a water content removing device equipped with a pair of ejection rollers.

Claims (1)

[Scope of Claims] l A veneer characterized in that moisture contained in the wood structure of the veneer veneer is removed by spraying pressurized gas onto at least one grain surface of the veneer veneer during transportation. Method for removing moisture from veneer. 2. Where the compressed gas in iii+ is hot air or water core air. A method for removing moisture contained in a veneer veneer according to claim 1. 3 The pressure of the compressed gas is 3 kg/cm2
The method for removing moisture contained in a veneer veneer according to claim 1g or 2 above. 4 Veneer veneer transport mechanism and veneer Qi &
A compressed gas blowing device equipped with blowing holes formed in series or 1 tlr continuously in a direction transverse to the conveying direction to blow compressed gas onto either one of the grain surfaces of the plate, and a gas compressor communicating with the compressed gas blowing device. and a veneer veneer support member provided at a position facing the compressed gas blowing device and supporting the veneer veneer to which the compressed gas is blown from the opposite side. 5. A patent claim in which the compressed gas ejection device is a rotatable hollow roller having a large number of ejection holes in its circumferential surface and a valve provided in the ejection holes so that the internal compressed gas is ejected by external pressure. A device for removing moisture contained in a veneer veneer according to item 4. 6. The veneer veneer according to claim 4, wherein the compressed gas blowout device is a box having a compressed gas escape surface on the inlet side of the blowout hole and a flat surface on the outlet side. Contained moisture removal device. 7. The device for removing moisture contained in a veneer veneer according to claim 4, 5, or 6, wherein the veneer veneer support member is a rotatable support roller. 8. Claim 4 or 8, wherein the veneer veneer support member is a veneer veneer support having a compressed gas escape surface on the inlet side of the jet hole and a flat surface on the outlet side. The apparatus for removing moisture contained in a veneer veneer according to item 5 or 6. 9 A conveyor mechanism for a veneer veneer and a mechanism that is arranged opposite to each other across a conveyance path and formed continuously or intermittently in a direction transverse to the conveyance direction in order to spray compressed gas on both the front and back surfaces of the veneer veneer being conveyed. A device for removing moisture contained in a veneer veneer, comprising a pair of compressed gas jetting devices equipped with a jetting hole, and a gas compressor communicating with the pair of compressed gas jetting devices. 10 The pair of compressed gas ejection devices are a pair of freely rotatable hollow rollers, each of which has a large number of ejection holes in a circular surface and has a valve provided in the ejection holes so that /f compressed gas inside is ejected by external pressure. An apparatus for removing moisture contained in a veneer veneer according to claim 8. 11 The pair of compressed gas jetting devices
10. The apparatus for removing moisture contained in a veneer veneer according to claim 9, which is a pair of boxes having an escape surface for compressed gas on the inlet side of the exit hole and a flat surface on the outlet side.