JPS6023005A - Tender rising device for veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a large number of small protrusions arranged in fractions on the outer periphery.
A veneer veneer (hereinafter simply referred to as a veneer) is inserted between a so-called tenderizing roll (hereinafter simply referred to as a tender roll) and a support member installed opposite to the tenter roll in a direction perpendicular to the m fibers, and small protrusions are formed. This invention relates to a tenderizing device configured to press-fit a body into a veneer and sequentially form a large number of small cracks in the veneer.

As a conventional tenderizing device of this type, for example, “Tenderizing device for veneer veneer” (#Opening/closing 4)
9-1707) and ``Roller for transporting veneer veneer'' (Utility Model Application Publication No. 5m-7s387). A tender roll comprising a large number of small protrusions distributed around the outer periphery and a support roll are arranged opposite to each other through a veneer passage, and the tender roll and support roll are rotated at the same veneer conveyance speed. There is a tenderizing device comprising:

According to the conventional apparatus, small cracks can be formed at a desired pitch (pitch of small protrusions) almost unaffected by the thickness and material of the veneer, and the surface can be formed as needed. It was also possible to change the pitch of small cracks by changing the pitch of small protrusions, and this was effective in softening the veneer.

However, as mentioned above, by adjusting the veneer conveyance speeds of the tender roll and the support roll to be the same, and simply press-fitting the small protrusions with sharp tips into the veneer, small parts of the veneer can be split to cause small cracks. If a small crack is formed following the shape of the small protrusion itself, the degree of opening is low, and after the small protrusion is removed, the elasticity of the veneer fibers prevents the small crack from forming on the surface. As a result, the elongation rate of the veneer became extremely low, and the improvement in the veneer yield due to elongation was slight.

The present invention includes softening treatment of the veneer by forming small cracks.
By increasing the elongation rate of the veneer.

This was developed with the aim of providing a tenderizing device that can improve the veneer yield more than ever before.

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 increases the veneer transport speed relative to the support member, is pressed against the veneer, the small protrusions also apply tensile force to local parts of the veneer, so if it is simply press-fitted, Small cracks with a higher opening degree are formed one after another, and when the small projections with blunt tips come into contact with each other, a part of the veneer becomes an indentation that is plastically deformed, and the formed small cracks are closed. Since this is prevented or reduced, the elongation rate of the veneer is increased and the veneer yield is significantly improved compared to the conventional method.

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 Vl of the tender roll l is set to be opposite to the plate 7 through the passageway, and the veneer conveyance speed Vl of the tender roll l is increased by 3% or more with respect to the veneer conveyance speed v2 of the support roll 6. As shown, the tip 2a of the small protrusion 2 is formed to be blunt.

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,
As the small protrusions 2 are press-fitted, local parts of the veneer 7 are fractured, and small cracks 8 are sequentially formed to impart flexibility to the veneer 7, but the veneer 7 of the support roll 6 Since the veneer conveying speed Vl of the tender roll l is 3% or more higher than the conveying speed v2, a tensile force is generated between the support roll 6 side of the veneer 7 and the tenter roll l side, and the small protrusions are simply The local part of the veneer 7 is compressed and deformed more than when the veneer 2 is press-fitted, and the crack prevention force due to friction on the surface of the support roll 6 is slightly canceled by the tensile force, so that the small protrusion 2 is simply Small cracks 8 with a higher degree of opening than in the case of press-fitting are formed one after another, and as is clear from FIG. A part of the board 7 becomes plastically deformed under pressure [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.

Veneer - Yield is significantly improved compared to conventional methods.

Incidentally, the elongation rate of a veneer is not necessarily uniform because it changes depending on the shape of the small protrusions, the shape of the veneer fibers, the difference in the veneer conveyance speed, etc., but according to experiments using undried veneers, Compared to the conventional device described above, the elongation rate increased by about 5 to 7%. The difference in veneer conveyance speed between the tender roll and the supporting member only needs to be 3% or more (preferably 5 to 25%), even when it is infinite, that is, when the supporting member is a non-rotating body. Although there was no practical problem except for a slight power loss, on the other hand, at about 2%, the synergistic effect with the blunt tip of the small protrusion was not sufficiently exhibited.

The shape of the tip of the small protrusion is not limited to the planar shape as shown in the embodiments shown in FIGS. 1 and 2, but may be curved as shown in FIG. There are various shapes such as tent shape as shown in FIG. 7, refracting surface shape as shown in FIG. 8, spherical surface shape as shown in FIG. 9, pyramidal surface shape as shown in FIG. 1θ, and conical surface shape as shown in FIG. Experimentally, the width H1 in the circumferential direction was set to 0.
．． Preferable dentition was obtained by setting 3 to 3I1m, but the point is that if the shape is such that a plastically deformed indentation can be formed in the middle plate, so as to prevent or reduce the occlusion of the formed small cracks. It doesn't matter how blunt it is, and although it is not shown in the drawings, even if it has a concave shape, which is the opposite 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 of the tender roll l, as shown in FIG. 5, but as shown in FIGS. The collar part 3 is provided on the outer periphery of the collar part 3 which is separate from the collar part 4, and the collar part 3 is attached to the shaft part 4 through a distance collar 5 so that the collar part 3 can be replaced with the shaft part 4 using fixing means such as key and screw tightening. Ba,
This is advantageous because it can reduce the production cost and consumption cost of the tender roll. Furthermore, when the small protrusions are made of iron or the like other than stainless steel φ ceramics, anti-rust treatment such as plating can be applied as necessary. However, in any case, from the point of view of effective elongation of the veneer,
Then, the circumferential pitch P1 of each small protrusion is equal to the veneer thickness T.
The width H2 in the axial direction of each small protrusion should be approximately 1.5 to 4 times the It is preferable that the pitch P2 in the axial direction of each small projection is at least 3 times the thickness T of the veneer. It is also effective to prepare in a zigzag pattern.

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. As the price of logs has skyrocketed 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. 3 is a diagram according to the present invention. 4 is an explanatory side view of the tenderizing device; FIG. 4 is an enlarged side view for explaining the operating state of the device illustrated in FIG. 3; and FIG.
Figures 11 through 11 are enlarged perspective views for explaining other embodiments of the small protrusion. vl, temple, veneer transport speed of tender roll, v2 war, veneer transport speed of support roll, l-...tender roll,
2*l+-small protrusion, 241e, tip of small protrusion, 6
...support roll, 7...-veneer, 8...small crack, 9
...Indentation patent applicant Meinan Seisakusho Co., Ltd.

Claims (1)

[Claims] A large number of small cracks are formed in a dispersed manner in the plywood veneer,
A veneer veneer tender consisting of a tenderizing roll with a large number of small protrusions distributed around the outer periphery and a supporting member such as a support roll that supports the veneer, which are arranged opposite each other through a passageway in the veneer veneer. In the rising device, the veneer conveying speed of the tenderizing roll is increased by 3% or more with respect to the support member in order to form small cracks and plastically deformed impressions by the pressure and tension of the small protrusions. In addition, a veneer veneer tenderizing device characterized in that the tips of the small protrusions are formed into a blunt shape such as a flat shape, a curved surface, a spherical shape, etc.