JPS6346375A - Drier for veneer - Google Patents

Abstract

(57) [Abstract] 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 drying device for veneer veneer,
More specifically, while conveying the veneer veneer (hereinafter simply referred to as veneer) in a direction orthogonal to the ti&m, hot air ventilation is carried out in which hot air is blown to dry the veneer veneer (hereinafter simply referred to as veneer) through a blowing device such as a blower box or blower nozzle. This relates to a type drying device.

Conventionally, the main type of drying equipment that has been put into practical use is one in which the veneer is held and conveyed by a pair of upper and lower wire mesh conveyors, but the shrinkage of the veneer due to drying (usually m
In order to avoid the occurrence of tearing due to accumulation of shrinkage, by allowing as much as possible (approximately 6 to 10%) in the direction perpendicular to the fibers, the running speeds of the upper and lower wire mesh conveyors are differentiated, and The structure is such that only the weight of the upper wire mesh conveyor acts on the veneer, and if necessary, the upper wire mesh conveyor can be divided into multiple sections, with a non-pressurized section in the middle to allow the veneer to sag. As a result, the veneer was restrained in an extremely unstable and uneven state.
Although the incidence of tears is on the decline, sporadic occurrences of large cracks that require excision can be avoided.
In addition, distortion (waving) caused by shrinkage errors and shrinkage similar to that occurring when no restraint is applied occur, which has the disadvantage of significantly deteriorating the quality yield of veneer, and has not necessarily been highly practical.

The present invention was developed to eliminate the drawbacks of the conventional device, and is based on a technical idea different from that of the conventional device, and is capable of uniformly restraining the entire surface of a veneer in a distributed manner at a large number of points. By controlling the shrinkage due to drying as much as possible, we can avoid the occurrence of ruptures due to shrinkage, while regularly generating many fine cracks, thereby reducing cracks and distortion φ shrinkage. In addition, in terms of the practicality of the device, it does not cost much to build each device individually, and maintenance and management to deal with wear and tear are easy. By adopting a rational configuration in which a plurality of members with simplified shapes are organically combined, the practicality of the device is greatly improved.

That is, specifically, a plurality of narrow thin strip-shaped endless conveyance members having a large number of protrusions at one side end are rotatably carried from the loading side to the loading side of the heat insulating machine frame. At the same time, twisting members are provided on the upper and lower sides of the reciprocating portion of the endless conveying member for twisting each endless conveying member in a direction in which the piercing body protrudes outward; A configuration is adopted in which a pressing member that presses and pierces the veneer against the pierced body of the endless conveyance member is provided at a position facing the twisting member or in the vicinity thereof, and the veneer is pierced and conveyed by the endless conveyance member.

Since the device with such a configuration is used to prick and convey the veneer, the entire surface of the veneer can be restrained evenly at many points in a distributed manner, and shrinkage due to drying can be avoided. Not only can it be possible to prevent the occurrence of fractures caused by the accumulation of shrinkage, but also it can regularly prevent numerous fine cracks starting from puncture wounds caused by the piercing bodies of the endless conveying member. Since cracks, distortions, shrinkage, etc. can be prevented from becoming apparent, this has a significant effect on improving veneer quality and yield.

In addition, since each member constituting the device is simplified based on the premise of organic bonding, it does not require much cost to form, and in particular, the pierced body is the one that is most frequently worn and damaged. Since each of the endless conveyance members can be individually attached and removed, maintenance and management are extremely easy.

Overall, its practicality is extremely good, and as mentioned above, the endless conveyor member is extremely easy to maintain and manage, and its shape does not pose a risk of significantly obstructing ventilation. It is also possible to place the protrusions in a dense manner so that they are precisely positioned, and in this way, the cracks can be subdivided and dispersed as if they had been subjected to ideal tenderizing treatment. It is possible to perform effective drying with almost no cracking, strain, shrinkage, etc.
This was discovered during the development process of the present invention.

Hereinafter, the present invention will be described in more detail with reference to an example of implementation illustrated in the drawings.

FIG. 1 is a side view of the apparatus according to the present invention, and FIG. 2 is an enlarged perspective view of the main parts.

In the figure, l denotes an endless conveying member in the form of a narrow thin strip having a large number of protrusions 2 at either side end, and includes a pair of front and rear rotating rolls 3, 3a, a guide roll 4. A plurality of tension rolls 5 and the like are used to tension the heat insulator frame 10 from the carry-in side to the carry-out side. It moves me.

Reference numeral 6 denotes a roll-shaped twisting member having a plurality of guide grooves 6a connected in the rotation direction, which are disposed on the upper side and the lower side of the forward movement portion of the endless conveying member l, and By the guiding action of 6a, each endless conveying member l is guided to the piercing body 2.
Twist it so that it protrudes outward.

Reference numeral 7 denotes a roll-shaped pressing member whose outer periphery is coated with an elastic body 7a such as rubber, which is disposed in a position facing the upper twisting member 6, and which pushes the veneer 8 onto the piercing body 2 of the endless conveying member 1. Press and thrust into.

Reference numeral 9 denotes a tension member consisting of a spring φ and a solid cylinder (not shown), which applies appropriate tension to each endless conveying member 1 via the tension roll 5.

Reference numeral 11 denotes a comb-shaped peeling member provided behind the twisting member 6 on the lower side, which facilitates the removal of the dried veneer 8a from the piercing body 2 of the endless conveying member l.

Reference numeral 12 indicates a puncture wound formed on the veneer 8 by the puncture body 2 of the endless conveyance member 1.

The apparatus according to the present invention is configured, for example, as described above, and when the veneer 8 is inserted in the direction perpendicular to the fibers from the inlet side of the warming machine frame 1O, the endless conveying member 1 is pressed and pierced into the pierced body 2, and is heated and pierced by hot air while being pierced and conveyed by the endless conveying member l.
The veneer will be dehumidified and dried, but the shrinkage that accompanies drying of the veneer is regulated to be distributed in small sections between each puncture body, and the shrinkage will only slightly enlarge the puncture wound. Of course, it is possible to avoid the occurrence of tearing caused by the accumulation of
As the result is that many fine cracks are generated regularly starting from each puncture wound, it is possible to avoid the appearance of single cracks, distortion, shrinkage, etc., and it has a remarkable effect on improving veneer quality and yield. It will be done.

In addition, as is clear from the above embodiments, each member constituting the device is simplified based on the premise of organic bonding, so it does not cost much to form, and it is especially easy to avoid wear and tear. Since each of the non-l1jA conveying members having a piercing body with a high frequency of 1 can be attached and detached individually,
It is extremely easy to maintain and manage, and its practicality is generally very good. Furthermore, as mentioned above, the endless conveyance member is extremely easy to maintain and manage, and because of its shape, there is no risk of significantly obstructing ventilation, so it is possible to install it closely so that the piercing bodies are positioned relatively precisely. In this way, the cracks can be finely divided and dispersed just as if ideal tenderizing treatment had been applied, and the cracks can be effectively processed without distortion, shrinkage, etc. It was confirmed through experiments during the development process that drying could be achieved.

Incidentally, in an experiment using a surface veneer with a thickness of 0.6 to 1.3 mm, it exhibited a wedge shape as shown in the figure, and the height was approximately 1 mm.
．． A piercing body 2 having a diameter of 5 mm and a width W of the proximal end of approximately 0.8 mm,
It is formed in large numbers with a pitch P of every 4 mm, and is 0.4
When endless conveying members l having a thickness T of mm were arranged at intervals of 11 mm and dried, almost no cracking, distortion, shrinkage, etc. appeared, and there was no problem in practical use when using them as they were on the surface of plywood. There wasn't.

As is clear from the above, according to the device according to the present invention, cracks and
It is possible to perform useful drying that avoids the appearance of distortion, shrinkage, etc., and the practicality of the device is extremely good.Moreover, by adopting a form in which endless conveying members are tightly installed, more effective drying can be achieved. It is also possible to do so, and the effects of its implementation are extremely large.

It should be noted that the shapes and combinations of the members forming the device are not limited to those exemplified in the above embodiments, and may be modified in various ways. The aspects will be explained in detail.

First, regarding the endless conveying member, it is recommended to use a rust-proof metal such as stainless steel or a metal such as steel so that it does not easily react with moisture, tannins, etc. of the veneer and has excellent wear resistance. It is preferable to use a no-knead treatment, and from the viewpoint of ease of twisting, it is preferable that the width and thickness are not too wide or thick, but from the viewpoint of durability,
It is inappropriate to make it extremely thin, and if necessary, a large number of small holes for ventilation may be provided in the center.

On the other hand, the shape of the prongs provided on the endless conveying member is preferably a wedge-like shape with a sharp tip and easy to form, such as the wedge shape shown in the above embodiment. Examples include bodies 2a and 2b, which have a shape similar to a fist, but in any case, the height and width W of the proximal end are
It is preferable not to make it significantly higher or wider than the thickness of the veneer, and the height should be about 1 to 6 mm, and the width at the part where the veneer is actually pierced.

A rough guideline is about 0.2 to 1 mm, and it is preferable to set the thickness within that range in proportion to the thickness of the veneer.

The pitch P of each piercing body and the spacing between each endless conveying member are determined based on the preconditions such as the thickness, material, and intended use of the veneer to be treated, as well as the allowable size of cracks, degree of flatness, etc. It can be arbitrarily set to harmonize with the conditions, but if the pitch P of each piercing body is wide, individual cracks tend to expand, and if it is narrow, pressure piercing tends to become difficult, and If the distance between each endless conveyor member is narrow, single cracks tend to connect.
On the other hand, if it is too wide, there is a risk that cracks will occur in areas other than the puncture wound, so it is desirable to take this into consideration when selecting the appropriate material. In this case, the pitch P of each piercing body should be about 1 to 5 mm, and the interval between each endless conveying member should be about 8 to 20 mm. In this case, even if the pitch P of each piercing body is increased to about 10 mm and the interval between each endless conveyance member is increased to about 50 mm,
The cracks did not become obvious and there was almost no problem in practical use.
It is preferable to set it within these ranges in proportion to the thickness of the veneer.

Further, in the above embodiment, the plurality of endless conveying members were uniformly tensioned through a single tension roll, but the tension roll and the tensioning member were separately applied to each endless conveying member. If the required number of endless conveyance members are arranged so that they can be tensioned individually, the tension of each endless conveyance member will be more stable, and installation and removal will be easier, which is extremely convenient.
Furthermore, if necessary, an appropriate number of guide members having a shape similar to a torsion member may be provided in the reciprocating portion of the heat insulating machine frame to stabilize the running. .

Next, regarding the twisting member, the roll-shaped member as exemplified in the above embodiment has a relatively simple structure, has relatively little friction with the endless conveying member, and has good durability. Although there are certain characteristics, for example, even if the configuration is as illustrated in FIG. 3 or FIG. There is no problem if they are used selectively depending on the characteristics of each. However, in comparison with an endless conveying member, it is preferable to select materials etc. so that the side of the twisting member wears preferentially.

That is, the embodiment illustrated in FIG. 3 is a plurality of pairs of rolling bearing-shaped torsion members 13 fixed on a frame 14 with countersunk screws 15 via washers 16, and the embodiment illustrated in FIG. The former is a plate-shaped twisting member 18 having a linear guide groove 18a with a slight opening on the inlet side, and the former comes into contact with the endless conveying member by rolling friction, so it has extremely good durability. support member 17
The latter has the characteristic that the structure is somewhat complicated, such as the addition of a cylindrical tube, and although the latter is extremely cylindrical in structure, there is a risk of slippage with the endless conveying member. Durability tends to decrease due to abrasion.

In addition, in the above embodiment, the removal of the dried veneer was facilitated by the peeling member provided at the rear of the twisting member on the lower side. Since there is a tendency for the endless conveying members to separate naturally as they return to twisting, one half of the endless conveying members and the other half should be connected to each other on the unloading side (preferably on the loading side as shown in FIG. 2). By twisting and returning in the opposite direction (alternately), stable detachment is possible without necessarily being assisted by a peeling member.

Next, regarding the pressing member, a roll-shaped one as exemplified in the above embodiment is convenient because the veneer can be inserted smoothly, and especially if the outer periphery is covered with an elastic material such as rubber, Although it is convenient for stabilizing the pressing stab and protecting the stabbing body, for example, even if it is a leaf spring-like pressing member made of synthetic resin or the like, the point is that it can press and stab the veneer to the stabbing body of the endless conveying member. That's enough.

It should be noted that shrinkage of veneer tends to become noticeable when the moisture content drops to around 30%. It is also effective to carry out initial drying using the device of the present invention, and from the point when the moisture content of the veneer approaches 30%, to finish drying the veneer to the desired moisture content using the device according to the present invention. It is not limited.

If necessary, it is also possible to process multiple veneers at the same time by stacking multiple sets of endless conveying members, etc., one above the other, or to process a pair of upper and lower wire mesh conveyors, etc. above or below. It is also possible to arrange them separately and process veneers for different purposes separately.

The apparatus according to the present invention is also suitable for drying a veneer that has been subjected to a tenderizing process in advance, and in such a case, the pitch P of each piercing body and the interval between each endless conveying member can be adjusted. , respectively. There is no problem even if the value is expanded to 2 to 3 times the original value.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a side view of the device according to the present invention, FIG. 2 is an enlarged perspective view of the main parts, and FIGS. 3 and 4 are a torsion member. FIGS. 5 and 6 are perspective explanatory views of other embodiments of the piercing body, and FIGS. 5 and 6 are side views of other embodiments of the piercing body.

Claims (1)

[Claims] A hot air ventilation type drying device that blows hot air to dry a veneer veneer while conveying it in a direction perpendicular to the fibers, and is an endless thin strip with a large number of protrusions at one side end. A plurality of conveying members are rotatably installed from the loading side to the unloading side of the heat insulating machine frame, and each endless conveying member is provided on the upper side and lower side of the forward moving portion of the endless conveying member. A twisting member is provided for twisting the member in a direction in which the piercing body protrudes outward, and further, at a position facing the upper twisting member or in the vicinity thereof, a pressure force is applied to press the plywood veneer to the piercing body of the endless conveyance member. A drying device for veneer veneer, comprising members arranged opposite each other, and characterized in that the veneer veneer is stuck and conveyed by an endless conveyor member.