JPH023912B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drying device for veneer veneer (hereinafter referred to as veneer), and its purpose is to finish the veneer in a moisture-containing state and to maintain the moisture-containing state uniformly or It is an object of the present invention to provide an apparatus for drying with a uniform tendency.

As is well known, veneer differs from artificial materials such as paper and cloth in that its moisture content, such as its moisture content or water content before drying, varies significantly. For example, when comparing individual veneers, it is not uncommon for the difference to be double, and even within a single veneer, there are considerable differences depending on the location. In order to dry a large number of veneers with such characteristics, from thousands to tens of thousands of veneers per day, it is important to control the finished state to be uniform or even, especially when drying veneers. It is certain that it contributes to the process.

However, in the conventional technology, the initial moisture content or finished moisture content is measured at the inlet and outlet of the drying device, and the feed speed of the entire device is changed according to the results to perform the above-mentioned control. The response to each veneer was extremely slow, and defects in uniformity were still occurring.

The present invention focuses on the shrinkage phenomenon of veneer panels that occurs during drying, and aims to achieve the above objectives by utilizing this phenomenon. The examples are as follows.

In Figure 1, 11, 12 and 13 are shown in the figure.
is a unit dryer for drying the veneer 1, and this example is disclosed in Japanese Patent Application Laid-Open No. 56-16079 by the applicant of the present application.
This is an example of a drying device based on No. 56-30572, No. 56-66677, No. 56-102678, etc. 3 and 4 in each unit dryer.
In order to ensure good transportation and drying of the veneer, a plurality of veneers are placed on one side of the veneer 1 and on the other side in such a way that the veneer 1 is sandwiched between the two sides in the direction perpendicular to the plane of the paper. As shown in the figure, it is wound around eight heating rolls 2 to form a meandering conveyance path.
In these methods, a veneer 1 carried in a direction perpendicular to the fibers is placed on the outer peripheral surface of a heating roll 2 that is driven to rotate.
The function is to bring the front and back sides of the veneer into contact while being conveyed while being reversed. On each heating roll 2, the wire rod on one side presses the veneer 1 against the heating roll 2, and the wire rod on the other side presses the veneer 1 against the heating roll 2. In order to move by sinking into a circumferential groove (not shown) formed in the heating roll 2, a sufficient contact state of the veneer 1 is ensured. In addition, unit dryers 11 and 12, and 12
and 13, and further unit dryer 1.
Devices 41, 42, and 43 for switching the path of the veneer 1 are provided at the end of the conveyance path 3. Each of these devices has an operating mechanism such as an air cylinder (not shown), and by its operation, can be displaced to the state shown by the two-dot chain line as necessary, and is transferred to the branch conveyor 5 forming the branch path. The veneer 1 can be branched and taken out. In addition, in the vicinity of the entrance of the unit dryer 11, a reference length detector 30 for measuring the length of the veneer 1 carried in in the direction perpendicular to the fibers is installed as a reference length confirmation device, and furthermore, each path switching device 41, 42 and 43 is installed. At the front position is a length check detector 31 that measures the length in the same direction again.
32 and 33 are provided, and the respective detectors are connected to the control device 6 as shown by a, b, and c, so that their measured values can be input. Further, this control device 6 uses the measured value inputted from the reference length detector 30 and the veneer from which the measured value was obtained.
Thereafter, the measurement values input each time they arrive at each length check detector are compared, and if there is a preset difference, the path switching device at the downstream position closest to that length check detector is The actuating mechanism is activated to control the veneer to be diverted to the diverter conveyor 5. In the figure, the output for operating the operating mechanism of the passage switching device 41 is shown as A, the output for operating the passage switching device 42 is shown as B, and the output for operating the same 43 is shown as C. The measured value of the length in the direction perpendicular to the fiber before drying shrinkage is compared with the measured value of the length in the same direction at each predetermined position, and control is performed as described above. That is, the length check detector 31
If we pay attention to one veneer that arrived at
If there is a preset predetermined difference at this point, it is branched to the branch conveyor 5 as described above, and if there is no predetermined difference, the conveyance is continued to the next unit dryer 12. Next, each time the veneer arrives at the length check detectors 32, 33, such a comparison is made in the same manner and the processing is performed as described above.

In this example, a stacker 7 is installed at the end of the unit dryer to stack veneers that have not experienced drying shrinkage as re-dried veneers. Those that are not stacked are transported on the branch conveyor 5 to the next process in a desired dry state. In addition, it is preferable that the veneers to be dried by the apparatus of the present invention, including the present example, be cut in advance into approximately the same length using a standard length clipper. Alternatively, the standard length clipper may be used as a reference length confirmation device, and a control mechanism may be configured that allows input of the length value in advance without providing a reference length detector as described above.

As described above, as is clear from the embodiment in FIG. 1, the apparatus of the present invention allows the desired time to be removed from the drying conveyance path based on the change in the length in the direction perpendicular to the fibers as the veneer dries. When the veneer reaches a dry state, the veneer is taken out to a branching path, thereby achieving a uniform or uniform water-containing state.

Moreover, what is illustrated in FIG. 2 is an explanatory diagram for explaining the present invention more generally, and in the figure, 8
indicates the starting end of the conveyance path, 9 indicates the end, and 8 to 9 are
Conveyance path 10 formed by a drying device of any type
is pointing to. For example, a drying device that dries while conveying, whether it is a well-known net dryer or a roll dryer, has at least a conveyance path for conveying the veneer, and any part of the conveyance path Passage switching devices as described above are provided at several locations. In the figure, 14 indicates a branch road, and 15 indicates a re-dried veneer transport route, but this re-dried veneer transport route 5 may be provided as necessary; In the case of an apparatus that does not take out the conveyance path, the branch path 14 shown at the end 9 of the conveyance path is constructed as a mere conveyance path. Further, it is preferable to install a large number of branch paths and path switching devices, and if necessary, they are provided in a distributed manner in the latter half of the entire transport path.
Also, 17 indicates the installation location of the length check detector described above, and 16 indicates the installation location of the reference length detector, but the reference length detector may be installed at the location before the contraction of the veneer starts. It may be placed anywhere, for example, on a carry-in conveyor provided in front of the drying device. Further, the length check detector may be located in front of the path switching device, and may be positioned in front of the path switching device sufficiently to activate the path switching device after measuring the length of the veneer. Moreover, the passage passage switching device may be of any type, and there is no particular restriction on the length measuring detector. However, preferably the detector is arranged so that the length of the same point on the veneer can be measured repeatedly.

In any case, according to the present invention, if the degree of shrinkage that is to be restricted according to the desired format, such as length or length ratio, is set for the control mechanism, each veneer will be able to shrink to that extent. Drying is completed and the product can be reliably dried to a uniformly hydrated state. In particular, when drying unthreaded veneers based on known threading techniques, or flattened raw veneers using adhesive threads, if they are dried to the point of excessive shrinkage, there will be gaps in the joints of these veneers. This caused many problems, but
According to the device of the present invention, the entire amount can be dried uniformly to the extent that the occurrence of such gaps can be prevented.
The effect is enormous. In addition, such a moisture content of 30
It is well known that it is inconvenient to carry out drying on the order of 1.5% by conventional moisture content measurement, both in terms of accuracy and for the purpose.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the apparatus, and FIG. 2 is an explanatory diagram for explaining the present invention more comprehensively. In the figure, 1... veneer, 2... heating roll, 3 and 4... linear body, 5... branching conveyor, 6... control mechanism, 7... stacker, 8... starting end of conveyance path, 9 ... End of conveyance path, 10 ... Conveyance path, 1
1, 12 and 13...Unit dryer, 1
4... Branch road, 30... Reference length detector, 31,3
2 and 33...Length check detector, 41, 4
2 and 43 are passage switching devices.

[Claims]

1 Pull out the trolley 40 from above the first rail 32,
The attachment 4 of the carriage 40 is attached to the upper surface of the rear part of the transfer carriage 1 that pushes the carriage 40 onto the second rail 33.
A pushing tool 4 that engages with the rear surface of the attachment 41 to push out the truck is installed upright, and a hook 7 that engages with the front surface of the attachment 41 and pulls out the truck when it swings upward is mounted on the front side of the pusher 4 with a spring. 12, it is pivoted so as to be stable in two positions, an upward swinging position and a downward swinging position, and is engaged with the cam portion 13 of this hook 7 at a required position on the second rail 33. A trolley transfer device characterized by being provided with a fixed lever 14 for switching its swinging position.