JPS5834741B2 - Namatan Pan Nogan Yuusibunjiyokiyasouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for removing moisture contained in green veneer.

Conventionally, green veneer is heated and dried using a dryer to achieve the desired moisture content before being used for plywood, but this not only consumes a large amount of energy and is uneconomical, but also reduces the initial moisture content of the green veneer. The non-uniformity of drying in plywood factories causes uneven drying, which is a combination of re-drying that reduces productivity and over-drying that causes problems such as excessive shrinkage, blistering, and poor adhesion. This was a factor that hindered process rationalization.

Therefore, as previously disclosed in "Apparatus for removing moisture contained in green veneer" (Japanese Patent Application Laid-open No. 19905/1983), the present applicant has developed a system that includes a roll for conveying green veneer and a machine installed opposite to the roll. A conveyance path for the green veneer is formed along the circumferential surface of the roll by the pressing body, and by compressing the green veneer while conveying it, a part of the moisture contained in the green veneer is removed. The present invention aims to equalize the moisture content of green veneers and improve the drying efficiency by providing a device and mechanically dewatering the green veneer using the device.

However, the above-mentioned device only processes raw veneer in the vertical direction (thickness direction).
Since it dehydrates raw veneer by compressing it, it tends to significantly damage the radial tissue (medullary rays) that guarantees the strength in the thickness direction of green veneer, which may impede its use in plywood. There was that.

The present invention was developed in order to eliminate the drawbacks of the conventional apparatus, and is designed to relatively reduce the compression of green veneer in the thickness direction, and also to compress the green veneer in the lateral direction (direction perpendicular to the fibers). This makes it possible to perform the desired dehydration while preventing a decrease in the strength of green veneers in the thickness direction, making it possible to equalize the moisture content of green veneers and improve drying efficiency, thereby making it possible to improve the drying efficiency of green veneers. The aim is to streamline the drying process in the drying process.

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

The apparatus for removing moisture contained in a raw veneer according to the present invention includes, for example, a first
As illustrated in the figure, a large number of gentle irregularities as shown in the figure are formed in a distributed manner on the circumferential surface of the roll 20 that conveys the green veneer 1, and the roll 2 is driven by an appropriate driving source (not shown). The conveying pressure surface 3a is provided so as to be able to be driven in the direction of the arrow shown in the figure, and is provided at a position facing the circumferential surface of the roll 2, the distance between which is slightly narrower than the thickness of the veneer and the conveyance pressure surface 3a is approximately constant. A pressurizing body 3 having an inclined compression pressurizing surface 3b which is followed by a pressurizing surface 3a and whose distance from the roll circumferential surface suddenly becomes narrower.
Set up opposite.

In the figure, 4 is a support, 5 is a fulcrum, and 6 is a splinter.

The apparatus according to the present invention is configured as described above, for example, and the green veneer 1 inserted into the conveyance path formed along the circumferential surface of the roll 20 is subjected to pressure by the roll 2 and the pressure body 3. The material is vertically compressed and laterally compressed to remove a portion of the moisture content before being transported.The compression action will be explained in more detail with reference to FIG.

That is, as shown in FIG. 3, for convenience, the raw veneer 1 is divided into A, B,
C..., and assuming that the frictional resistance force that each block receives from the conveying pressure surface 3a of the pressurizing body 3 is -1, since the roll 20 circumferential surface is uneven, the corresponding The conveyance force received from the roll 2 exceeds this, and the frictional resistance force received from the inclined compression and pressure surface 3b of the pressure body 3 further exceeds it because the compression and pressure surface 3b is steeply sloped. Assume +2 and -3, respectively.

For example, if we look at blocks A, B, and C, the conveyance force exceeds the frictional force in the conveyance section 2a of the conveyance path, so blocks A and B are conveyed sequentially while being slightly compressed vertically. In the part 2b, the frictional resistance force exceeds the conveying force, so the block C and the roll 2 slip slightly, causing lateral compression between the flocks C and B. After the part is laterally compressed, the overall Since the conveying force exceeds the frictional resistance force, the wood is sequentially conveyed in the rotational direction of the roll 2, and in the compression process, part of the moisture contained in the wood is removed, and after passing, it is gradually restored to its original state by the elasticity of the wood fibers. do.

Since dehydration is done by compression, the moisture content of each raw veneer tends to be uniform both individually and as a whole. Since the movement tends to be accelerated, the overall drying efficiency is significantly improved compared to conventional equipment.Moreover, since not only vertical compression but also horizontal compression is performed, it is possible to achieve the same compression rate as the conventional equipment. Even if there is, there is no tendency for the radiation tissue to be significantly damaged, and there is no risk of impeding its use on plywood.

The above description of the compression effect is for convenience; in reality, the green veneer is in a continuous state, so the compression effect also extends to the upper side of the compression position in the conveyance direction.

The values of the conveyance force and frictional resistance force are also for convenience, but the point is that it is sufficient that the correlation is as described above, and that the conveyance pressure surface There is no problem if the width of the area and the angle of the compression surface are selected appropriately.

The unevenness formed on the circumferential surface of the roll is within a gentle range that will not damage the raw veneer if it slips with the raw veneer.
It is preferable that the unevenness is such that it can impart as strong a conveying force as possible, and experimentally, as shown in FIG. In addition, the friction coefficient of the conveying pressure surface should be as small as possible, and the friction coefficient of the compression pressure surface should be large within a range that does not damage the raw veneer, so that vertical compression can be reduced and horizontal compression can be increased. This is preferable because it allows

Further, as in the embodiment illustrated in FIG. 1, if the pressurizing body 3 is provided so as to be swingable in the direction of the arrow shown in the figure about the fulcrum 5 using the support body 4 and the spring 6, As is clear, it is easier to insert the front end of the green veneer, and under normal conditions, as is clear from Figure 5, it is possible to carry the green veneer while compressing it in a well-balanced manner. When the rear end passes, as is clear from Fig. 6, the pressurizing body swings so that the compression surface moves away from the □-ru peripheral surface, so the frictional resistance force decreases and the rear end It is convenient because the support body passes through as it is, and it is also possible to elastically support the support body itself with a spring or the like, or to provide a fixed pressurizing body, but in any case, illustration is omitted. However, it is preferable to slightly chamfer the edges of the conveying pressure surface so as not to damage the green veneer.

In addition, in order to smoothly remove the contained moisture, a plurality of grooves of appropriate width are provided in the axial direction of the roll at appropriate intervals, and the grooves run in the opposite direction to the rotational direction of the roll. A moisture removal means such as a brush may be disposed in the groove to forcibly remove moisture squeezed into the groove due to compression.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a schematic side view of the device for removing moisture contained in green veneer according to the present invention, FIG. 2 is an enlarged explanatory view of the main part of the roll, and FIG. 3 is an explanatory diagram of the compression action, and FIGS. 4 to 6 are explanatory diagrams of the operation of the pressurizing body. 1...Raw veneer, 2...Roll, 2a.
...Conveyance section of raw veneer conveyance path, 2b...
Compression part of green veneer conveyance path, 3... Pressurizing body, 3a
...Transportation pressure surface, 3b...Compression pressure surface, 4...Support, 5...Fully point, 6...
・・・・Sprinkle, R・・・・Roll radius, θ・
...The angle of the unevenness with respect to the pair in the tangential direction of the roll.

Claims (1)

[Claims] 1 Containment of green veneer formed by forming a conveyance path for the green veneer along the circumferential surface of the roll using a roll that conveys the green veneer and a pressurizing body of an appropriate shape installed opposite to the roll. In the moisture removal device, a large number of gentle irregularities are formed in a distributed manner on the circumferential surface of the roll, and a portion of the pressurizing body facing the roll circumferential surface is formed such that the distance from the roll circumferential surface is equal to the thickness of a single plate. The raw material is characterized by forming a conveying pressurizing surface that is slightly narrower than the conveying pressurizing surface and having an approximately constant interval, and an inclined compression pressurizing surface that continues from the conveying pressurizing surface and whose distance from the roll circumferential surface suddenly becomes even narrower. Equipment for removing moisture from boards.