JPH0431841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a veneer veneer tenderizing device.

Conventionally, the so-called tenderizing process is a process in which a large number of small cracks are formed in a dispersed manner in a veneer veneer (hereinafter simply referred to as veneer) for the purpose of eliminating cracks, homogenizing it, or preventing overlapping due to moisture. Various devices have been proposed to carry out this process, and among them, ``Method and device for forming small cracks in veneer veneer'' (Unexamined Japanese Patent Application Publication No. 1973-1999) filed by the present applicant. As disclosed in Japanese Patent No. 110007), there is a carry-in roller group consisting of a plurality of narrow rollers arranged at appropriate intervals in the axial direction of the rollers, and a group of narrow rollers arranged in the axial direction of the rollers. The rollers of both roller groups are arranged in an alternating manner so that the axes of the rollers of both roller groups are arranged in a staggered manner so that the axes of the group of rollers on the delivery side, which are arranged at appropriate intervals, are very close to each other. Each roller group is driven so that the conveyance speed of the unloading roller group is faster than the conveying speed of the loading roller group through one or more drive shafts arranged at appropriate positions to drive each group. and a veneer support mechanism of an appropriate form installed opposite the veneer transport mechanism across a veneer path so as to support the veneer. A veneer tenderizing device that applies tensile force to the veneer while conveying it in an orthogonal direction to sequentially form a large number of small cracks,
Other conventional devices include, for example, a tenderizing device that uses a combination of a large-diameter rubber roller and a small-diameter rigid roller to bend the veneer while conveying it in a direction perpendicular to the fibers, thereby forming small cracks;
Alternatively, compared to a tenderizing device that uses a combination of two soft rubber rollers to stretch the veneer while conveying it in a direction perpendicular to the fibers to form small cracks, the thickness and material of the veneer can be reduced. It was an extremely effective tenderizing device that could form desired small cracks more stably without being significantly influenced by the above.

However, all of the above-mentioned conventional tenderizing devices were developed with the main purpose of softening the veneer, such as eliminating cracks and homogenizing the veneer, or preventing overlapping due to moisture. The improvement in the veneer yield, that is, the elongation of the veneer in the direction perpendicular to the fibers, did not produce any secondary effects, and the elongation rate after treatment was about 1 to 4% at most.

Of course, the elongation rate in the direction perpendicular to the fibers of the veneer during the operation of the conventional device (during treatment) is usually higher than the elongation rate after treatment, but as the external force is removed, many small cracks occur. As a result, the elongation rate remains at about the above-mentioned elongation rate due to blockage, and if the device is applied too much and the veneer is forcibly elongated, small cracks that should be formed in a dispersed manner will become large cracks. Because they become connected, they create gaps that impede commercialization, or the veneer is divided, resulting in a decrease in yield.

The purpose of the present invention is to provide a tenderizing device that can significantly improve the veneer yield as well as soften the veneer, and has been completed by adding improvements to the device filed by the applicant. The rollers of at least one of the roller groups constituting the veneer conveying mechanism in the apparatus are provided with a large number of small protrusions with flat or riveted tips on the outer peripheral surface in a roughly radial manner. By using a protruding rolling roller, the veneer is conveyed in a direction perpendicular to the fibers, and tensile force is applied while locally plastically deforming many parts, and/or tensile force is applied. However, by locally plastic deforming in many places, together with the dispersed formation of many small cracks, the blockage of the small cracks can be prevented or reduced, and the elongation rate in the direction perpendicular to the fibers of the veneer is reduced. This is a significant improvement over the conventional method.

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

FIG. 1 is a partial front view of the device according to the invention, and FIG. 2 is a side sectional view thereof. In the figure, reference numeral 2 denotes narrow rollers, which are arranged in plural at appropriate intervals in the axial direction, and constitute a group of rollers on the carry-in side of the veneer conveyance mechanism A that conveys the veneer 1 in a direction orthogonal to the fibers. ing. Numeral 4 is a narrow roller having a large number of small protrusions 5 on the outer peripheral surface. A plurality of narrow rollers 4 are arranged so as to be intersected with each other in an alternating manner between the rollers 2 of the carry-in roller group, and are used to convey veneer. It constitutes a group of rollers on the unloading side of mechanism A. Further, as is clear from FIG. 3, the small protrusions 5 have blunt tips and protrude approximately radially, and each of the roller groups has support shafts 3, 3.
via at least one of a and the main shaft 6,
Each of the rollers is driven in the direction of the arrow in the figure by a drive source (not shown) such as a motor with a speed reducer so that the conveyance speed of the output roller group is faster than the conveyance speed of the input roller group.

A plurality of narrow rollers 7 are arranged at appropriate intervals in the axial direction and are rotatably supported by support shafts 8 and 8a, and 9 are narrow rollers arranged alternately between the rollers 7. Multiple locations are arranged so that the
A narrow roller rotatably supported by the main shaft 10, which is disposed opposite to the loading-side roller group and the unloading-side roller group of the veneer transport mechanism A, respectively, across the path of the veneer 1, A veneer support mechanism B facing the veneer transport mechanism A is configured.

The device according to the present invention is configured as described above, for example, and when the veneer 1 is inserted into the device in a direction perpendicular to the fibers, the gap between the input side roller group and the output side roller group of the veneer conveyance mechanism A is In this process, a tensile force is applied to the veneer 1 due to the difference in conveyance speed, and a large number of small cracks 11 are formed one after another. Since the veneer is fixed in place, small cracks can be stably formed without being significantly affected by the thickness or material of the veneer, and most small cracks are localized due to the pressure of small protrusions. At the same time, the indentation 12 that is plastically deformed is also formed. Because so-called small protrusions form small cracks and plastically deformed indentations at the same time, the small cracks and indentations almost coincide, as shown in Figure 4, and most of the indentations are caused by small cracks. It is located inside. As a result, the indentations located inside the small cracks prevent or reduce the closure of the small cracks due to elastic recovery, so that the elongation rate of the veneer after treatment is significantly improved compared to the conventional method.

According to experiments, it has been found that there are some differences in the formation of small cracks depending on the pitch of the small protrusions or the difference in conveyance speed between the incoming roller group and the outgoing roller group. However, the pitch of the small protrusions is about 1.5 to 3 times the thickness of the veneer, the distance between the axes is about 2 to 5 times the pitch of the small protrusions, and the elongation rate of the veneer is the desired difference in conveyance speed. Experiments were conducted with the elongation rate set at the same level or 1.3 times the elongation rate, and the treatment was successful in all cases, with the elongation rate ranging from several percent to a dozen or more compared to when small cracks were formed using the conventional device mentioned above. %,
Furthermore, compared to the case where small cracks are formed using the conventional apparatus described above, rolling is further performed using a roller similar to the rolling roller used in the apparatus of the present invention.
The elongation rate of the veneer improved by several percent.

The forms of the veneer transport mechanism and the veneer support mechanism are not limited to the forms exemplified in the above embodiments, and other embodiments including various modifications and application examples may be mentioned, so they will be described below. will be described in detail through examples illustrated in the drawings, and mechanisms having the same form will be designated by the same reference numerals, and redundant explanation will be omitted.

In the embodiment illustrated in FIG. 5, 13 is a rotatably supported wide roller, and the veneer conveyance mechanism A has the same configuration as the embodiment illustrated in FIGS. 1 and 2. are installed oppositely across the passage of veneer 1,
A veneer support mechanism B ₁ facing the veneer transport mechanism A is configured.

That is, if the veneer support mechanism is configured in this way, it is easy to implement and is practical, but from the viewpoint of smooth veneer conveyance, the outer circumferential surface of the roller 13 should be subjected to a surface treatment such as plating to reduce friction. It is preferable to aim at reducing the loss, and when driving the roller 13 as necessary, it is preferable to drive it at the same speed as the conveyance speed of the carry-in side roller group of the veneer conveyance mechanism.

In the embodiment illustrated in FIG. 6, reference numeral 14 is a narrow roller having a large number of small protrusions 5b on the outer peripheral surface, and a plurality of narrow rollers are arranged at appropriate intervals in the axial direction, and are used to convey the veneer. It constitutes the carry-in side roller group of mechanism _A1 . 16 is the roller 14 of the carry-in side roller group.
A veneer conveyance mechanism A ₁ is a plurality of narrow rollers arranged in a staggered manner between the veneer conveyance mechanism A 1
This constitutes the unloading roller group. Further, as is clear from FIG. 10, the small protrusions 5b have blunt tips and protrude approximately radially, and each of the roller groups is connected to at least one of the main shaft 15 and the support shafts 17, 17a. Via one of them, each of the rollers is driven in the direction of the arrow shown in the figure by an appropriate drive source (not shown) so that the conveyance speed of the discharge side roller group is faster than the conveyance speed of the carry-in side roller group.

In other words, even if the veneer transport mechanism is configured in this way, the state of formation of small cracks is not much different from that in the case of the example apparatus illustrated in FIGS. 1 and 2, and the elongation rate of the veneer after treatment is also The amount is the same or slightly reduced, so there is no difference in practical terms, but not only in this example, the small protrusions protruding from the outer circumferential surface of the roller located on the carry-in side are effective in preventing rotation inside the veneer. Since this tends to damage the surface of the veneer, it is preferable to use a shape that does not have sharp corners, such as the shape illustrated in FIG. 10 or 11, for example.

In the embodiment illustrated in FIG. 7, reference numeral 18 is a narrow roller having a large number of small protrusions 5c on the outer peripheral surface, and a plurality of rollers are arranged at appropriate intervals in the axial direction, and are used to convey the veneer. It constitutes the carry-in side roller group of mechanism _A2 . Numeral 20 is a narrow roller having a large number of small protrusions 5a on the outer peripheral surface. A plurality of narrow rollers 20 are arranged so as to be intersected with each other in an alternating manner between the rollers 18 of the carry-in roller group. It constitutes the unloading roller group of mechanism _A2 . Further, as is clear from FIGS. 9 and 11, the small protrusions 5a and 5c have blunt tips and protrude in a generally radial shape, and each of the roller groups has a main shaft 19 and a rubber, etc. A suitable drive source ( (not shown) in the direction of the arrow shown in the drawing.

That is, if the veneer transport mechanism is configured in this way, the formation of small cracks will be similar to that in the case of the embodiment apparatus illustrated in FIGS. As the indentation caused by the small protrusions increases, the elongation rate of the veneer tends to increase somewhat after treatment, which further improves the veneer yield, but the brittle veneer becomes less easy to handle. Therefore, it is preferable not to set the conveyance speed difference between both roller groups to be larger than necessary. Further, the present embodiment is not limited to this embodiment, and when supporting the roller from the outer periphery, the roller may be supported by a roller coated with an elastic body.

In the embodiment illustrated in FIG. 8, a plurality of 23 are provided at appropriate intervals in the axial direction, and
It is a narrow roller rotatably supported by 4 and 24a, and 25 has a large number of small protrusions 5 on its outer peripheral surface.
d, a plurality of narrow rollers are arranged so as to be intersected in an alternating manner between the rollers 23, and are rotatably supported by the main shaft 26, each of which is made of a single plate. A veneer support mechanism B ₂ is provided opposite to the loading-side roller group and the unloading-side roller group of the conveyance mechanism A across the path of the veneer 1, and faces the veneer conveyance mechanism A.
It consists of Further, the small protrusion 5d is the 12th
As is clear from the figure, the tip is blunt and protrudes approximately radially.

In other words, if the veneer support mechanism is configured in this way, the elongation rate tends to be further improved, although there is a risk that the use of the veneer will be restricted because the impressions caused by the small protrusions remain on both sides of the veneer. This is particularly effective when processing relatively thick veneers.Also, although not shown, there are many small protrusions on the outer peripheral surface of the rollers on the side opposite to the carry-in roller group of the veneer transport mechanism. It is equally effective to provide a protruding body or to provide a large number of small protrusions on the outer peripheral surface of each roller facing both roller groups.

That is, as is clear from each of the above embodiments, the veneer transport mechanism of the apparatus according to the present invention has at least one of the loading side roller group and the unloading side roller group constituting the veneer transport mechanism. The rollers of the roller group may be rolling rollers having a large number of small protrusions with blunt tips protruding generally radially from the outer peripheral surface. Also, the width of the rollers in the carry-in roller group and the width of the rollers in the carry-out roller group do not necessarily have to be the same.
However, there is no problem even if both rollers are arranged strictly in a staggered manner, and of course there is no problem even if a gap exists between both rollers.

Furthermore, the shape of the small protrusion protruding from the outer peripheral surface of the rolling roller may be any shape as long as its tip is blunt, such as flat or riveted so that the indentation is plastically deformed. Various shapes can be mentioned, such as prismatic, cylindrical, truncated pyramid, truncated cone, and mushroom shapes, but in any case, shapes that leave excessive indentations may deteriorate the quality of the veneer. It is inappropriate because it occurs, and if necessary, the first
As is clear from the figure, a plurality of rows of small protrusions may be provided protruding from the outer peripheral surface of the roller.

In addition, from the viewpoint of smooth veneer conveyance, the veneer support mechanism has a roller group on the loading side and a roller group on the unloading side of the veneer conveying mechanism, respectively, as illustrated in FIGS. 1 and 2 or 8. A configuration consisting of a plurality of opposing roller groups is preferable, and it is even more effective if each roller group is driven at the same speed as the roller group of the veneer conveyance mechanism. Even with a single wide roller as shown in the example,
Although not shown in the figure, even if it is a fixed flat plate with a smooth surface, the point is that it has a configuration that can obtain a pressurizing effect to apply a conveying force to the veneer by facing the veneer conveying mechanism. However, it may take any form.

Furthermore, when implementing a more specific device, it may be possible to change the distance between the axes of the roller groups constituting the veneer conveyance mechanism and the conveyance speed, or to make it possible to change the distance between the axes of the roller groups constituting the veneer conveyance mechanism or the veneer support mechanism. One of the rollers may be supported so as to be elastically displaceable, a dust removal device may be disposed near the rolling roller, or the surface of each roller may be subjected to anti-rust treatment such as plating.

As is clear from the above, according to the apparatus according to the present invention, small cracks are not only formed in a veneer in a dispersed manner to impart flexibility to the veneer, but also small cracks can be formed in a single type of member. The plastically deformed indentation is formed almost simultaneously, the small crack and the indentation are almost aligned, and most of the indentation is located inside the small crack, thereby preventing or reducing the clogging of the small crack due to elastic recovery. Therefore, it is extremely useful because it can perform a tenderizing treatment that greatly improves the elongation rate in the direction perpendicular to the fibers of the veneer compared to the conventional method, and the effect of implementing the present invention in a plywood factory is extremely large.

[Brief explanation of drawings]

The drawings are for explaining the present invention, and FIG. 1 is a partial front view of the device according to the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is an enlarged explanation of a small protrusion. Figure 4 is a partial cross-sectional view of the veneer after treatment,
5 to 8 are side sectional explanatory views for explaining other embodiments of the device according to the present invention, and FIGS. 9 to 1
FIG. 2 is an enlarged explanatory view for explaining another embodiment of the small protrusion. A, A ₁ , A ₂ ... Single plate transport mechanism, B, B ₁ , B ₂ ...
...Single plate support mechanism, 1...Single plate, 2, 4, 7, 9,
14, 16, 18, 20, 23, 25...Narrow roller, 3, 3a, 8, 8a, 17, 17a, 2
4, 24a...Support shaft, 5, 5a, 5b, 5c,
5d...Small protrusion, 6, 10, 15, 19, 26
...Main shaft, 11...Small crack, 12...Indentation, 13
...Wide roller, 22...Elastic body.

Claims (1)

[Claims] 1. A carry-in roller group comprising a plurality of narrow rollers arranged at appropriate intervals in the axial direction of the rollers;
A plurality of narrow rollers are arranged at appropriate intervals in the axial direction of the rollers, and the rollers of both roller groups are intersected in an alternating manner so that the axes of the roller group are brought very close to each other. At the same time, the conveyance speed of the output roller group is lower than the conveyance speed of the input roller group through one or more drive shafts disposed at appropriate positions to drive both roller groups respectively. A veneer transport mechanism configured to drive each roller group so as to speed up the process, and a veneer transport mechanism of an appropriate form installed opposite the veneer transport mechanism across the path of the veneer so as to support the veneer veneer. A veneer veneer tenderizing device comprising a veneer support mechanism, which conveys the veneer veneer in a direction perpendicular to the fibers and applies a tensile force to the veneer veneer to sequentially form a large number of small cracks. In order to prevent or reduce clogging of small cracks due to release of tensile force, at least one of the rollers of the roller group constituting the veneer conveyance mechanism is provided with a flat tip on the outer peripheral surface. A veneer veneer tenderizing device characterized by a rolling roller comprising a large number of small, blunt protrusions like rivet heads protruding generally radially.