JPS61116278A - Method of treating 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 for treating a veneer veneer.

Currently, the only way to remove moisture contained in veneer veneers (hereinafter simply referred to as veneers) is to use the labor-intensive method that was used in the early days of plywood to sandwich the veneer between horizontal bars outdoors. There was a complete transition to a forced drying method using a drying device such as the so-called sun-dried heating air circulation type, which dehumidifies by standing up against the sun and using heat from the sun.

In addition to mainstream dryers such as roll dryers and net dryers, there are a wide variety of drying equipment in use today, such as hot plate dryers and wick dryers. It has many disadvantages such as being large in size, having poor thermal efficiency, insufficient labor saving and efficiency, and even deteriorating the quality of the veneer, so it is not necessarily effective. I couldn't say that there was.

Therefore, the present applicant first developed a method for drying undried veneers (
As disclosed in Japanese Unexamined Patent Publication No. 53-148502), in the process of stacking veneers, inserts such as crossbars are partially placed between each veneer layer, so that a small amount of space is placed between each veneer layer. Create a gap,
We proposed a new drying method that uses natural or artificial drying to improve the drying method for veneers. In the case of partial intervention, not only will there be problems such as significant drying unevenness occurring locally between the part where the inserted body intervenes and the part where it does not intervene within a single veneer, but also As the slight gaps that should be formed between each veneer layer become uneven due to the bending of the board, the air permeability also becomes uneven. This also causes the inconvenience of drying errors.

Furthermore, if the number of inserts is increased in order to avoid this inconvenience, there is a drawback that the local drying unevenness further increases, which is somewhat difficult to put into practical use.

The present invention has been completed by further improving the drying method described above, and provides a method for treating veneers that makes it possible to efficiently and effectively remove moisture from veneers with a relatively small volume of use. The aim is to streamline the veneer drying process at plywood factories.

That is, the method for treating veneers according to the present invention generally involves attaching an appropriately shaped ventilation member, such as a wire mesh or a coil spring, that has air permeability in all directions, for each veneer of an appropriate number (preferably two, more preferably one). A structure in which a large number of veneers are stacked one after another with the ventilation member interposed over the entire surface, and then the moisture contained in the veneer is removed by forced or natural ventilation to the area where the ventilation member is interposed. Since moisture is removed while the veneers are piled up, dehumidification can be achieved with a relatively small volume of use, and the intervening ventilation member has ventilation in all directions. , there is less risk of problems such as localized significant uneven dehumidification or local dehumidification errors within a single veneer, and the veneer can be efficiently and effectively dehumidified. It is something that can be done.

The present invention will be described in more detail below based on an example of implementation illustrated in the drawings.

FIG. 1 is a perspective explanatory view for explaining the stacked state of the veneer, and FIG. 2 is an enlarged front view of the same.

In the figure, reference numeral 1 denotes a wire mesh-like ventilation member interposed almost entirely between each veneer 2, and as is clear from the figure, the existence of a large number of interconnected spaces 1a allows ventilation in all directions. This enables forced or natural ventilation in multiple directions.

Reference numeral 3 denotes a stacking table on which veneers 2 are stacked with a ventilation member 1 interposed therebetween, and if necessary, a flexible roller, wheels, etc. are attached to make the table movable. .

In the treatment method according to the present invention, 1, for example, the veneer 2 is deposited as described above, and then, preferably, by using an appropriate forced ventilation means as described later, forced ventilation is applied to the area where the ventilation member 1 is interposed. By ventilating, the moisture contained in each veneer can be removed relatively quickly, or by leaving the accumulated veneers 2 outdoors for an arbitrary period of time. The moisture contained in each veneer can be removed by natural ventilation to the part where the ventilation member 1 is interposed, but in any case, the intervening ventilation member has air permeability in all directions. , within a single veneer,
Problems such as locally significant uneven dehumidification, or 1-)
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There is little risk of H + S; Productivity is good, furthermore, the occurrence of defects such as warping and curling can be prevented or significantly reduced, and there is extremely little risk of deterioration of the veneer, and effective dehumidification can be performed.

The degree of dehumidification may be selected as appropriate depending on the purpose of use of the veneer.For forced ventilation, for example, the degree of dehumidification may be selected intentionally depending on the purpose of use of the veneer. However, in any case, forced ventilation and natural ventilation are not necessarily limited to the implementation of either one alone, and if necessary, one can be applied before or after the other. There is no problem in repeating the process several times.

Furthermore, when stacking veneers as described above, it is preferable to interpose a ventilation member between at least every two veneers, since this can also avoid or reduce the occurrence of dehumidification errors between each veneer. - It is more preferable to interpose a ventilation member for each veneer because it can simultaneously dehumidify the front and back surfaces of the veneer, or it may be more preferable to interpose a ventilation member for every three or more veneers for a relatively long time due to natural ventilation. If dehumidification is performed gradually over a period of time, the dehumidification error between each veneer tends to be relatively small, so this is not necessarily impractical.

For example, it is effective to perform preliminary dehumidification on the premise of re-drying using a heating dryer or the like.

However, from the viewpoint of dehumidification uniformity and efficiency, it is still desirable to interpose a ventilation member every few sheets as possible.

In addition, it is preferable that the veneers are formed into a certain size and stacked, and furthermore, if the veneers are stacked with at least one side aligned,
It is effective because forced ventilation such as air φ suction can be performed intensively by using the side surface, and with narrow width veneers, there is no problem if multiple pieces are joined or not joined to form a fixed size. Various known deposition devices, including the deposition device disclosed in the above-mentioned publication, can be used as the device for sequentially depositing veneers of a fixed size, and ventilation members can be automatically interposed using the deposition device, etc. It would be most convenient if you forced him to do so, but
Either or both may be done manually, and although not shown in the figure, if necessary, separate surface plates may be used to level the stack for each number of sheets. There is no harm in letting them do so.

In addition, as a means for performing forced ventilation, for example, from various directions as illustrated in FIGS.
Using a forced ventilation system (not shown) consisting of a dehumidifier, heating device, etc., or a combination thereof, if necessary, install a four-piece shield, a duct, and a hood (not shown).
It is convenient to use forced ventilation means that continuously or intermittently blows, sucks or circulates normal air, dehumidified air, heated air, dehumidified heated air, etc. using Forced ventilation means may be used to effect forced ventilation by continuously or intermittently feeding the stacked veneers together with the stacking table into a drying chamber designed to agitate heated air, or a drying device capable of reducing pressure may be used. Even with forced ventilation means, in which the accumulated veneer is fed continuously or intermittently along with the stacking table, the moisture in the veneer is heated and evaporated using a microwave heating device, etc. In other words, any forced ventilation means that performs forced ventilation may be used, as long as it can promote dehumidification of the veneer. The forced ventilation method may be repeated several times, but regardless of whether forced ventilation or natural ventilation is performed, if necessary, as shown in FIG. It is also possible to carry out this process while pressurizing the board via the surface plate 5 or the like to restrict shrinkage of the veneer due to dehumidification.

As mentioned above, from the viewpoint of ease of handling, the ventilation member to be interposed between the veneers is a wire mesh-like ventilation member made of various meshes as illustrated in FIGS. 1 and 2, or 13 or 14. Although it is convenient to use a plate-like member like member 1, for example, a coil spring-like ventilation member 6 having a space 6a as shown in FIG. Alternatively, in addition to the bead-shaped ventilation member 7 having a space 7a as shown in FIG. Whether it is a rod-shaped object such as a branch, a granular object such as a rhombus, or even a combination of these shapes, the point is that it spreads in all directions. Any shape can be used as a ventilation member as long as it has air permeability. However, it is preferable that the area of each point in direct contact with the veneer is relatively small, and that the area of each point in direct contact with the veneer is relatively small, and that as many points as possible come into contact in a distributed manner. In addition, it is more preferable if the shape has closely spaced spaces. On the other hand, in terms of adhesion during deposition, the thickness or height of the part that contacts the veneer should be as uniform as possible, or the thickness or height should be somewhat elastic in the thickness direction. It is convenient if it is possible, and it is also suitable for use with corrosive materials such as Steffle 26 synthetic resin.
It is convenient if it is made of a material that has excellent abrasion resistance, and if necessary, it is made of a shape or material that has shrinkage in a predetermined direction, and the direction of shrinkage is perpendicular to the fibers of the veneer. It is also possible to reduce the degree to which the ventilation member obstructs the shrinkage of the veneer due to dehumidification by interposing the ventilation member in the direction of the veneer. It is also possible to use it as a member of forced ventilation means.

In addition, from the viewpoint of uniform air permeability, it is preferable to have the ventilation member interposed over a relatively wide area, but it is not necessary to cover the entire surface of the veneer.
As long as the uniformity of air permeability is not significantly impaired due to bending of the veneer due to the partial absence of ventilation members, ventilation members should be interposed in a dispersed manner over the entire surface. For example, the 12th
As illustrated in the figure, Misawa x Rokushaku x Thickness l ms+ ~5
AM veneer, outer diameter 51111~10! Experiments in which forced ventilation was performed using 3 to 8 coil spring-shaped ventilation members 6 of I11 at approximately equal intervals confirmed that there was no practical problem, and the present invention generally As mentioned above, it is specified that the configuration in which ventilation members are provided throughout the entire surface includes a state in which the ventilation members are distributed in a distributed manner over the entire surface as long as the uniformity of ventilation is not significantly impaired. When intervening parts in a dispersed manner,
As in the above embodiment, if the fibers of the veneer are interposed continuously in the direction perpendicular to m#1 of the veneer, or by narrowing the interval in the direction perpendicular to the fibers of the veneer (not shown), the fibers of the veneer can be interposed. This is preferable because it adapts to the anisotropy and causes relatively little deflection of the veneer in the portion where the ventilation member is missing.

In addition, as an example of other different deposition forms, FIG.
FIG. 18 shows an embodiment in which a coil spring-like ventilation member 6 is interposed in a spiral shape.
An embodiment in which (1) is folded and interposed at appropriate lengths is shown, and FIG. 19 shows an embodiment in which a continuous veneer 2 is folded and deposited at appropriate lengths. Furthermore, the second
Fig. 0 shows an example in which a continuous ventilation member is folded at appropriate lengths of 6 (1), and a continuous veneer 2 is folded back in between. Including the deposition form, any deposition form that allows forced ventilation or natural ventilation is sufficient, and the deposition form is not limited to that of the examples.

[Brief explanation of drawings]

The drawings are for explaining the present invention, and FIG. 1 is a perspective explanatory view for explaining the stacking state of the veneer, and FIG.
3 to 1θ are plan views for explaining the direction of ventilation, and FIG. 11 is a side view for explaining the state of pressurizing the accumulated veneers. FIG. 12 is an explanatory plan view for explaining a state in which ventilation members are interposed in a dispersed manner, FIGS. 13 to 16 are explanatory plan views for explaining other embodiments of the ventilation member, and FIG. UgJ to 2nd
FIG. 0 is a side explanatory view for explaining another embodiment of the deposition form. 1.8.7---Ventilation member, la, 8a, 7a*
*・Space, 2... Φ veneer, 3. Fist, stacking table, 4 fist... Shielding plate, 5φ... Surface plate Patent applicant Meinan Seisakusho Co., Ltd. Figure 11 Figure 13 Figure 12 Figure 14 1st
Figure 5 Figure 17 Figure 18 Figure 19 Figure 20

Claims (1)

[Claims] A large number of veneer veneers are stacked one after another, with ventilation members of an appropriate shape such as wire mesh, coil springs, etc. having air permeability in all directions interposed almost entirely for each appropriate number of sheets, and then the ventilation members are interposed. A method for treating a veneer veneer, characterized by removing moisture contained in the veneer veneer by forcing or natural ventilation into the portion.