JPH0373441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a so-called tenderizing roll (hereinafter simply referred to as a "tender roll") which is provided with a large number of small protrusions distributed around its outer periphery, and a support member provided opposite to the tender roll. Tenderizing in which a veneer veneer (hereinafter simply referred to as veneer) is inserted between the fibers in a direction perpendicular to the fibers, and small protrusions are press-fitted into the veneer to sequentially form a large number of small cracks in the veneer. It is related to the device.

Conventional tenderizing devices of this type include, for example, “Tenderizing device for veneer veneer” (Japanese Unexamined Patent Publication No. 1707/1988) and “Roller for transporting veneer veneer” (Japanese Patent Application Laid-open No. 76387/1987). As disclosed in et. There is a tenderizing device in which the tender roll and the support roll are arranged opposite to each other and configured to rotate at the same veneer transport speed.

According to the conventional apparatus, small cracks can be formed at a desired pitch (pitch of small protrusions) almost unaffected by the thickness or material of the veneer, and if necessary, By changing the pitch of the small protrusions, it was also possible to change the pitch of the small cracks, which was effective in softening the veneer.

However, as mentioned above, the tender roll and the support roll have the same veneer conveyance speed, and a small protrusion with a sharp tip is simply press-fitted into the veneer, causing small cracks in the veneer by tearing a local part of the veneer. When a small protrusion is formed, a small crack is formed following the shape of the small protrusion itself, so the degree of opening is low, and after the small protrusion is removed, the small crack is As a result, the elongation rate of the veneer became extremely low, and the improvement in the veneer yield due to elongation was slight.

An object of the present invention is to provide a tenderizing device that can soften the veneer by forming small cracks, further increase the elongation rate of the veneer, and improve the veneer yield more than ever. It was developed for this purpose.

That is, the tenderizing device according to the present invention connects a tender roll having a large number of small protrusions distributed on the outer periphery and a support member such as a support roll that supports a veneer through a passage in the veneer. In addition, the veneer transport speed of the tender roll is increased by 3% or more relative to the support member, and the tips of the small protrusions are formed into a blunt shape such as a flat, curved, or spherical shape. When the tender roll, which has increased the veneer conveyance speed relative to the supporting member, is pressed against the veneer, the small protrusions also apply tensile force to local parts of the veneer, so it is not a simple press-fit. Small cracks with a higher degree of opening are formed one after another than in the case where the small protrusions are formed, and when the small protrusions with blunt tips come into contact with each other, a part of the veneer becomes an indentation that is plastically deformed, and the small cracks that are formed are Because it prevents or reduces clogging of cracks,
As a result, the elongation rate of the veneer increases, and the veneer yield is significantly improved compared to conventional methods.

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

The tenderizing device according to the present invention, as illustrated in FIG. The veneer conveyance speed V1 of the tender roll 1 is set to be 3% or more higher than the veneer conveyance speed V2 of the support roll 6, and furthermore, for example, the first
As illustrated in Fig. 2, the tip 2 of the small protrusion 2
It is formed by forming a into a blunt shape.

The tenderizing device according to the present invention is configured as described above, for example, and if the veneer 7 is inserted between the tender roll 1 and the support roll 6 in a direction perpendicular to the fibers, the small protrusions 2 can be press-fitted. As a result, local parts of the veneer 7 are fractured and small cracks 8 are formed one after another, giving flexibility to the veneer 7. However, the veneer conveying speed V2 of the support roll 6 Since the veneer transport speed V1 of the roll 1 is increased by 3% or more, a tensile force is generated between the support roll 6 side of the veneer 7 and the tender roll 1 side, which is greater than when the small protrusions 2 are simply press-fitted. At the same time, the local part of the veneer 7 is compressively deformed, and the tensile force slightly cancels out the crack prevention force caused by the friction on the surface of the support roll 6. As a result, the opening is larger than when the small protrusions 2 are simply press-fitted. Small cracks 8 with high degrees of severity were formed one after another, and as is clear from Fig. 4,
Along with the press-fitting of the small protrusion 2 whose tip 2a is blunted,
A part of the veneer 7 becomes a plastically deformed indentation 9, which prevents or reduces the blockage of the formed small cracks 8, so that the elongation rate of the veneer 7 increases compared to the case of conventional splitting. The veneer yield is significantly improved compared to conventional methods.

Incidentally, the elongation rate of a veneer varies depending on the shape of small protrusions, the shape of veneer fibers, the difference in veneer conveyance speed, etc., so it is not necessarily uniform, but in experiments using undried veneers, According to the above, compared to the conventional device mentioned above,
The growth rate increased by about 1.5 to 7%. The difference in veneer conveyance speed between the tender roll and the support member is
It is sufficient if it is 3% or more (preferably 5 to 25%),
Even when it was set to infinity, that is, when the supporting member was a non-rotating body, there was no practical problem other than a slight loss of power, but on the other hand, when it was set to about 2%, the tips of the small protrusions were formed bluntly. The synergistic effect was not fully demonstrated.

The shape of the tip of the small protrusion is shown in Figures 1 and 2.
The shape is not limited to the planar shape as shown in the example shown in the figure, but also the curved surface shape as shown in FIG. 5, the hipped shape as shown in FIG. 6, the tent shape as shown in FIG. There are various shapes such as spherical shape as shown in FIG. 9, pyramidal shape as shown in FIG. 10, and conical shape as shown in FIG.
Although favorable results were obtained in both cases when the setting was set to Although it is not shown in the drawings, even if it has a concave shape opposite to that of the illustrated embodiment, it was possible to obtain a better effect than the conventional one.

Further, the small protrusions may be provided directly and integrally on the outer periphery of the shaft portion of the tender roll 1, as illustrated in FIG. 5, but as illustrated in FIGS. 1 and 2,
A collar part 3 is provided on the outer periphery of the flange part 3 which is separate from the shaft part 4 of the tender roll 1, and the flange part 3 can be replaced with the shaft part 4 using a fixing means such as a key or screw tightening via the distance collar 5. It is advantageous to reduce the production cost and consumable cost of the tender roll, and if the small protrusions are made of iron or the like other than stainless steel or ceramics, it may be necessary to There is no problem with applying anti-rust treatment such as plating, but in any case, in order to effectively elongate the veneer, the circumferential pitch P1 of each small projection is equal to the thickness T of the veneer. About 1.5 to 4 times,
In addition, in order to suppress the negative impact on other veneers caused by indentations and the decrease in veneer strength due to continuous small cracks, the axial width H2 of each small protrusion is equal to the veneer thickness T.
1 to 5 times the axial pitch P of each small protrusion
2 is preferably three times or more the veneer thickness T,
Further, although not shown in the drawings, it is also effective to provide them in a staggered manner (zigzag shape) in the axial direction.

Further, the support member provided opposite to the tender roll is not limited to a rotating body such as the support roll illustrated in the example, but may be an appropriately shaped support member having a surface on which a veneer can slide, although not shown in the drawings. A non-rotating body (fixed body) may be used, but in any case, in order to reliably support the press-fitting of small protrusions, it is desirable that its surface be made of a material that is difficult to elastically deform, and that also promotes the formation of small cracks. Therefore, it is preferable that the surface be as smooth as possible.

In addition, if necessary, either the tender roll or the support member may be made elastically displaceable relative to the other, or the tender rolls may be compared in order to suppress the axial deflection of the tender roll. There is no problem in making the veneer shorter and arranging them in parallel in the fiber direction of the veneer, and if necessary, in order to separate the veneer from the small protrusions, The plate peeling member may be provided near the small protrusion.

As is clear from the above, according to the tenderizing device according to the present invention, it is not only possible to impart flexibility to the veneer due to small cracks, but also it is possible to significantly improve the veneer yield compared to the conventional method. In view of the soaring prices of logs due to resource nationalism, the effects of implementing the present invention in plywood factories are extremely significant.

[Brief explanation of drawings]

The drawings are for explaining the present invention, and FIG. 1 is a partial front explanatory view of a tender roll used in the apparatus of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. FIG. 4 is an explanatory side view of the tenderizing device, and FIG. 4 is an enlarged side view for explaining the operating state of the device illustrated in FIG. 3, and FIGS.
The figure is an enlarged perspective view for explaining another embodiment of the small protrusion. V1...Tender roll veneer conveyance speed, V2
... Veneer transport speed of support roll, 1 ... Tender roll, 2 ... Small protrusion, 2a ... Tip of small protrusion, 6 ... Support roll, 7 ... Veneer, 8 ... Small crack, 9...Indentation.

Claims (1)

[Claims] 1. In order to sequentially form a large number of small cracks in a veneer veneer in a distributed manner, a tenderizing roll equipped with a large number of small protrusions distributed in a distributed manner on the outer periphery, and a supporting member such as a support roll that supports the veneer, The veneer veneer tenderizing device is a veneer veneer tenderizing device arranged oppositely through a passageway in the veneer veneer, in order to form a plastically deformed indentation while forming small cracks by pressure and tension by the small protrusions. A veneer laminate characterized in that the veneer transport speed of the tenderizing roll is increased by 3% or more relative to the support member, and the tips of the small protrusions are formed into a blunt shape such as a flat, curved, or spherical shape. Plate tenderizing equipment.