JPS5936185B2 - Undried veneer dehydration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for processing undried veneers containing a large amount of moisture.

Some devices that mechanically compress and remove moisture contained in undried veneers use a pair of rolls to apply pressure from both the front and back sides of the veneer, reducing the thickness of the veneer and pushing out the moisture contained in the veneer. However, there were the following problems.

A veneer cut with veneer lace or the like has medullary rays 8 in the thickness direction of the veneer 1, as shown in Figure 4, and these medullary rays 8 play an important role in the strength of the veneer 1 in the thickness direction. This is what we are accomplishing.

However, when compressing the veneer 1 in the thickness direction to remove the moisture content, if the veneer 1 is compressed excessively, the medullary rays 8 are destroyed, the strength is reduced, and the thickness of the veneer 1 is also significantly reduced. ,
On the other hand, with compression to the extent that the medullary ray 8 was not destroyed, the contained moisture could not be sufficiently removed.

The present invention has been made to solve the above problem, and will be explained below using examples.

As shown in FIGS. 1 to 3, the upper side feed roll 2,
2A and lower side feed rolls 3, 3A are provided slightly shifted from each other, and the rolls 3, 3A are driven at a circumferential speed smaller than that of the roll 2°2A.

A large number of grooves 4, 4 are formed on the circumferential surface of the rolls 2, 2A in the rotation direction.
Guides 5 and 5A are arranged between the rolls 2 and 3 and between the rolls 2A and 3A to press the veneer 1 against the roll 3A and the roll 2.

The sliding surfaces of the guides 5, 5A as a whole are arcuate in order to press the veneer 1 against the rolls 3A and 2, and the upper end portions are shaped like an arc as shown in the partially enlarged view of FIG. The comb-shaped tip portions 6, 6A are formed in a comb shape, and the comb-shaped tip portions 6, 6A are connected to the roll 2,
Prepare for a state in which the grooves 4 and 4A of 2A are respectively invaded.

Furthermore, the surfaces of the guides 5 and 5A that are in contact with the veneer 1 are provided with a third
As shown in the cross-sectional view of the figure, the groove 7° 7A is formed so that the part continuous with the comb-shaped tip 6.6A is higher.

Note that the distance between each roll is smaller than the thickness of the veneer 1 to be processed, but the distance between roll 2 and roll 2A is the minimum,
Next, the distance between roll 2 and roll 3A and the distance between roll 3A and roll 3 are made to increase in this order.

The embodiment of the present invention is constructed as described above, and its effects will now be described.

The veneer 1 is inserted into the area where the rolls 2, 2A and 3, 3A are rotating from the upper side of the rolls 2, 2A.

The veneer 1 is held and conveyed by the rolls 2 and 2A, but when the tip reaches the rolls 3 and 3A-, the peripheral speed of the rolls 3 and 3A is slower than the peripheral speed of the rolls 2 and 2A, so the veneer 1 is at the lower end. Since the side moves at a slower speed, the veneer 1 is compressed in the direction of movement and the moisture contained therein is removed.

That is, the compression of the veneer 1 is explained in FIG. 4 as it is compressed by receiving a force in the horizontal direction with respect to the chain line 8, so that the chain line 8 does not break even if it is compressed excessively. Moreover, the thickness does not decrease.

At this time, in order to generate frictional force against the veneer 1 of the rolls 2, 2A and 3, 3A, compression is also performed in the thickness direction of the veneer 1, but compression in the direction of movement of the veneer 1 is also performed. Because of this, the contained moisture is removed without excessive compression in the thickness direction, and the chain line 8 is not destroyed.

In addition, since the entire surface of the veneer 1 is finally pressurized by the rolls 3 and 3A in which no grooves are formed, the internal stress of the veneer 1 in the pressurized area is high, and the veneer 1 is not removed. This moisture cannot proceed downstream from the rolls 3, 3A, and only the veneer 1 from which the moisture content has been removed is sent out from the rolls 3, 3A.

On the other hand, the removed moisture is removed from the grooves 4 of the rolls 2, 2A,
4A and the grooves 7, 7A of the guides 5, 5A to fall downward and be removed.

At this time, a hole communicating downward may be formed in the groove 7A of the guide 5A so that the moisture accumulated in the groove 7A can be flushed out.

In the manner described above, the moisture contained inside the veneer 1 is rationally removed without destroying the chain line 8.

In addition, grooves 4, 4A are formed on the rolls 2, 2A, and the guides 5,
Since the 5A comb-shaped tip portions 6, 6A are inserted, the veneer 1 can be easily and smoothly transferred from the rolls 2, 2A to the guides 5, 5A.

In another embodiment, the roll 2A, guide 5A, and roll 3A may all be moved toward the lower side until the roll 2A and guide 5 are aligned.

In addition, in rolls 2 and 2A and rolls 3 and 3A,
Each roll may be driven.

Furthermore, if the rolls 2 and 2A and the rolls 3 and 3A are heated rolls, it is possible to produce a veneer with lower moisture content.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of the present invention, with Figure 1 being a side view and Figure 2 showing the relationship between the roll 2A and guide 5A when the roll 2 is removed in Figure 1. 3 is a partially enlarged view of the plan view shown in FIG.
The figure is a partially enlarged side view of the veneer. 1...Single plate, 2,2A...grooved roll, 3゜3A...field roll, 5,5A...guide, 8... ...chain line.

Claims (1)

[Scope of Claims] 1. On the lower side of a pair of grooved rolls that sandwich and convey a dried veneer having a large number of structures on the circumferential surface, a roller that rotates at a circumferential speed slower than the circumferential speed of the grooved rolls and similarly A pair of rolls for pinching and conveying the undried veneer is provided, and one of the grooved rolls is in a position where the undried veneer can be held between it and one of the rolls of the pair of rolls on the lower side. The undried veneer is characterized in that the rolls are arranged respectively, and a guide of an appropriate shape having an arcuate sliding surface is provided between the grooved roll and the lower roll. Dehydration equipment. 2. The apparatus for dewatering undried veneer according to claim 1, wherein each guide has a comb-shaped tip that enters the groove of the grooved roll. 3. The apparatus for dewatering undried veneer according to claim 1 or 2, wherein part or all of the grooved roll and the lower roll are heated rolls.