JPS61263549A - Veneer single board carry-in method in multi-state roll dryer - Google Patents

Abstract

PURPOSE:To reduce adhesion of resin to the dryer roll thus to facilitate maintenance by pressure contacting and carrying a single board through a pair of rolls wound with rubber at the carry-in side in each stage of dryer and adhering the leaked resin to the roll. CONSTITUTION:Single boards P are carried with high speed and constant period from chip conveyer 2 in automatic feeder 1 to the roll 7 at each stage of feed-in roller conveyer 6. Upon extinction of inertia to transfer to low speed of carry-in conveyer 6, they are carried to the rolls 8, 9 arranged at each stage while pressure contacting with constant pressure. The rolls 8, 9 has sufficient strength even when holding the single board P while wound with rough top belt and carries the single board P while holding to adhere the leaked resin onto the surface of roll then carry to the feed rolls 4, 5 of dryer 3. Consequently, adhesion of resin onto many feed rolls 4, 5 is reduced resulting in facilitation of maintenance.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention provides a method for drying a veneer veneer using a multi-stage roll dryer.
This invention relates to a method for carrying a veneer veneer that reduces the amount of resin adhering to a feeder.

"Prior Art" A continuous veneer veneer is produced by stripping raw logs using veneer lace, and is cut into a desired length using a cutting device. When drying with a fully multi-stage roll dryer (hereinafter simply referred to as a dryer), an automatic feeder's ziggle conveyor is used, which connects each stage of the next stage feed roller conveyor with a constant interval of mm. , the worker was inserting a plurality of veneers in parallel corresponding to one load.Next, the veneers were conveyed at high speed by the chiggle conveyor to the feed roller conveyor having a constant radiation angle. Furthermore, after being carried into a dryer comprising a large number of pairs of upper and lower feed rolls arranged in multiple stages in the conveying direction, the articles were dried by hot air circulating within the apparatus during the conveyance.

"Problems to be Solved by the Invention" The veneer in the process of being dried by the dryer described above is
Is this due to the bending of the feed rolls themselves due to the natural resin leaking onto the surface of the veneer being softened or melted when it is heated by hot air during the process of being transferred to the veneer and then conveyed between the heated feed rolls? , especially both ends 1! It attaches to the surface of r9 and gradually enlarges that area. Therefore, the circumferential speed of that part is increased, and a force acts in the direction of tearing the veneer being transported in the direction of the fibers. There was a risk that cracks in the thin veneer for the front or back panels would cause cracks. Needless to say, since this type of top veneer has a higher added value than other veneers, the loss due to the above-mentioned damage is large. - Although the veneer had escaped damage, slippage occurred due to the difference in the circumferential speed of the feed rolls as described above, causing disturbances in its posture during transportation, which caused problems with automatic dam removal by unloaders, etc. was. For this reason, in plywood factories, depending on the number of stages of the dryer and the number of heating sections, a huge number of feed rolls (several hundred or more) have to be removed, and sometimes the resin with deposits attached to the surfaces must be removed. , it took several days or more to remove it, even if many people were mobilized. Furthermore, as the raw wood situation has worsened in recent years, the above-mentioned disadvantages have become even more serious due to the use of low-grade wood containing a large amount of resin.

"Means for Solving the Problem" The present invention solves the above-mentioned problems by using a pair of upper F rolls completely wrapped with rubber at arbitrary positions near the loading side of each stage of the dryer. The present invention provides a method in which a veneer to be dried is held and conveyed in a fully pressed state and then conveyed to a dryer.

``Example'', a prior art auto feeder equipped with a chiggle conveyor 2 that oscillates to each stage of a feed roller conveyor, which will be described later, at a constant cycle, 8 is a pair of upper and lower feed rolls 4 consisting of multiple stages.
．． 5t - This is a conventional dryer in which a large number of sets are arranged in the transport direction, one of which is connected to a drive device (not shown), and the veneer P to be dried is dried while being transported by a feed roll 4.5. 6 is rotated by a feed roller conveyor consisting of feed rolls 4.5 of each stage of this dryer 8 and a large number of drive rollers 7 driven at uniformly low speed, and placed at an arbitrary position near the carry-in side of the dryer 8 of 7. is provided with rolls to be described later. 82
and 9 are rubber ( (not shown) is wrapped. Furthermore, to specifically describe the rolls 8.9 used in the applicant's experiments, the upper roll 8 is made of a steel pipe (not shown) with an outer diameter of 1400 and a wall thickness of 4.5x, and the lower roll 9 is made of a steel pipe with an outer diameter of 1650 and a wall thickness of 4.5x. A 5.0 mm thick steel pipe (not shown) is wrapped with a raft belt (not shown), which is widely used for conveying plywood and has numerous anti-slip irregularities on its surface.

Next, the operation of this embodiment will be explained. The veneers corresponding to 1 load inserted into the auto feeder 1 by the operator are transported at high speed 6 after the tipple conveyor 2 communicates *a with the next stage feed roller conveyor 606 at regular intervals. Next, this veneer P slides on the low-speed feed-in roller conveyor 6, the inertia given by the auto feeder 1 is eliminated, and it is transferred onto the feed-in roller conveyor 6 at a constant constant speed. Roll 8.9 in a pressed state with the pressure of
Transported to. This roll 8.9 has sufficient strength even when the entire veneer P is clamped, so that the deflection is slight, so that the pressure is applied almost uniformly over the entire length, and the curve of the part pressed against the veneer P is uniformly deformed. In this state, roll 8.9 is a veneer P
When the veneer P is held and conveyed, the resin leaked onto the surface of the veneer P can be squeezed out and adhered to the roll 8.90 curved side.

The installation position of the rolls 8.9 is the dryer 3 shown in the figure.
The veneer is not limited to the position adjacent to the starting end of It may be placed at any position from the position where the dryer 6 is reliably transferred to the starting end of the dryer 8.

Furthermore, the roll 8.9 is not limited to one completely wrapped with a raft lub belt, but can also be a commercially available anti-slip belt similar to VC, or a large number of grooves ft of an appropriately shaped surface parallel to each other.
Alternatively, it can be replaced with a piece of rubber engraved into a reticulated mesh, or a piece of rubber wrapped with N number of wart protrusions. In short, it is sufficient to form irregularities on the surface that increase friction.

"Effects of the Invention" As is clear from the above description, in the present invention, since the veneer is carried into the dryer after drying, the resin of the veneer adhering to the feed roll of the dryer is reduced. Therefore, the cycle for removing the wood 111 stuck to the surface of the feed roll, which requires a lot of manpower and time each time, is significantly extended, and contributes to improving the operating rate of the dryer. In addition, since the resin adhering to the roll near the dryer input side can be removed, work efficiency is improved, and the resin adhering to the feed roll can be easily removed due to the difference in circumferential speed. The damage to the board is @W1.compared to the conventional one. It has additional effects such as not causing the veneer to break, and also reducing the disturbance in the active posture of the veneer that occurs during transportation, improving the workability of automatic damming.

[Brief explanation of the drawing]

111ffi? f7 is a schematic side layout view showing an embodiment for explaining the present invention. 3...Multi-stage roll dryer, 4.5...Feed roll, 8.9...Roll, P...Standard length or sized veneer

Claims (1)

[Claims] At any position near the loading side of each stage of a multi-stage roll dryer,
A method for carrying a veneer veneer into a multi-stage roll dryer, characterized in that the veneer veneer to be dried is held and conveyed in a pressure-contact state by a pair of upper and lower rolls wrapped with rubber, and then carried into the multi-stage roll dryer. .