JPS644881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a veneer for plywood.

When manufacturing veneers for plywood by turning raw wood with veneer lace, since the raw wood is a natural tree and has an irregular shape, the width of the veneer in the fiber direction is initially less than the desired width. Next, veneers with a desired width in the fiber direction but irregular shapes at both ends in the direction perpendicular to the fibers, so-called edge-length veneers, are intermittently cut, and eventually a continuous band-shaped veneer is produced. It is common knowledge that this will be deleted.

Conventionally, scale-like veneers such as those mentioned above have been discarded, and the irregularly shaped portions of end-scale veneers have been cut off and formed into squares for use in plywood. Because the veneer lace is sent out discontinuously in a curled state due to its habit, the processing after the veneer lace is extremely complicated, and the processing requires an enormous amount of equipment and manpower. Furthermore, the scale-like veneer and irregularly shaped parts of the edge veneer are reused as chips or fuel, but their value is a fraction of that of plywood veneer or less. However, its utilization as a wood resource was extremely low.

The present invention was developed in order to improve the various problems in the conventional veneer manufacturing method described above, and includes a virtual outer shell (hereinafter simply referred to as virtual outer shell) that has almost the same shape as the circumscribed cylindrical shape of the raw wood, and various Filling and gluing a filler into a space of arbitrary volume among the spaces formed between the logs and creating a composite log consisting of the logs and the filler,
Next, by turning the composite raw wood, it is possible to process the end length veneer after the veneer lace very smoothly, and if necessary, by appropriately selecting the material of the filler. , which aims to make effective use of valuable wood resources by allowing end-scale or scale-like veneers to be used for appropriate purposes without any treatment, in other words, while remaining in an irregular shape. It is.

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

The present invention is based on a raw wood 1 as illustrated in FIG. 1, for example.
Of the space 3 formed between the virtual outline 2 and the log 1, a filler 4 is filled and glued into the entire space 3 of an arbitrary volume, for example, as illustrated in FIG. , a composite log 5 consisting of log 1 and filler 4 is created, and then the composite log 5 is turned as illustrated in FIG. 3, where 9 is sent out at the beginning of peeling. It is a thin veneer that does not have a predetermined thickness.

As is clear from FIG. 3, from the composite log 5, a composite veneer 8 consisting of a plate-shaped body 7, which is initially cut from the filling portion, and a veneer 6, which is cut from the log portion, is continuously formed. The veneer 6 is sent out in the form of a continuous band, and eventually the veneer 6 cut from the raw wood is sent out in the form of a continuous band as usual, so it is possible, for example, to wind it all up immediately after being sent out, or For example, it is possible to cut the veneer into desired lengths and deposit them, and the processing steps after veneer lace can be significantly streamlined compared to the conventional method.

In addition, since all of the composite veneers 8 have the desired thickness except for the thin veneer 9 at the beginning of peeling, it is not possible to use them as is for plywood by appropriately selecting the material of the filler 4. In addition, it is also possible to effectively utilize the irregularly shaped portions of scale-like veneers and end-length veneers, which have traditionally been poorly utilized as wood resources.

That is, as the filler, it is ideal to use a material that is inexpensive, has excellent machinability, is lightweight, and preferably has appropriate strength, that is, a material that has properties similar to those of raw wood. In plywood factories, wood-based waste materials that have traditionally been used only as fuel, such as wood powder such as sawdust from various types of saws, and chips cut from log scraps and cored wood, etc. Since these are available in abundance, it is sufficient to use these wood-based waste materials, and the utilization value of the wood-based waste materials also increases.

In addition, when filling and adhering the wood-based filler while keeping the compression within a range where the workpiece formation is good, it should be noted that even in the composite veneer, areas with a relatively high filling ratio of the filler (for example, scale-like As the strength in the fiber direction tends to decrease more easily than in regular veneers, the more veneer there is (parts with more veneers), the more caution must be taken when using the veneer. , the strength in the fiber direction is not required to a great extent, and in particular, the strength in the fiber direction of the core plate used in the center of five or more layers of plywood is hardly required. There is no practical problem in using veneer as plywood.

Of course, in order to strengthen the strength of the composite veneer in the fiber direction, it is advantageous to use wood rod-like pieces such as cut veneer waste, which have a longer length in the fiber direction than wood flour, chips, etc. If necessary, it is also effective to mix in chips cut from bamboo, and if the log is a hardwood such as lauan, it is also effective to mix in chips from coniferous trees. Regardless of which material is used as the filler, the adhesive for bonding the filler should be a wet curing adhesive or
Conventionally known adhesives such as room temperature curing adhesives may be used.

Other embodiments of the present invention include, for example, when using unusually irregular logs with knobs, etc., or when the use requires some strength in the fiber direction of the composite veneer. As a practical example of the usage, a composite log is created by filling and gluing the entire space formed between a virtual cylindrical shape with a diameter slightly smaller than the virtual outline of the log and the log, and then turning the log. Examples include:

When turning the composite raw wood constructed as described above, most of the scale-shaped veneers 6a that are initially cut from the raw wood are intermittently sent out, as illustrated in FIG. If there is no problem, then the end length veneer 6b is cut from the raw wood part.
Since the composite veneer 8 consisting of the somewhat scaly veneer 6a and the plate-like body 7 cut from the filler part is delivered in a continuous band shape, as in the previous embodiment, The processing steps after veneer lace can be significantly streamlined compared to conventional methods, and at least all end length veneers can be used effectively.In this way, composite veneers with a small filling ratio of fillers can be Since its strength is not much different from normal veneer, it can be used not only as the middle plate of three-layer plywood, but also as the base plate, except for aesthetic reasons.

Furthermore, as another embodiment of the present invention, the main focus is on streamlining the processing of end length veneers, and in principle, scale-like veneers and irregularly shaped parts of end length veneers are not used as veneers for plywood. As an example suitable for use in cases, etc., in the space formed between a virtual cylindrical shape with a diameter slightly smaller than the virtual outer circumference of the raw wood and the raw wood, filler is filled in the spaces near both ends of the raw wood. An example is gluing to create a composite log and then turning.

When the composite raw wood constructed as described above is turned, the fifth
As illustrated in the figure, most of the scale-like veneers 6a that are initially cut from the raw wood are sent out intermittently, so there is no problem if they are discarded as is.
Next, the end length veneer 6b cut from the raw wood part and some scale-like veneer 6a are sent out while being connected by a narrow plate-shaped body 7 cut from the filler part. Therefore, for example, it is easy to insert the veneer directly into a curl correction device, drying device, etc., and the processing steps after veneer lace can be significantly streamlined compared to conventional methods, and appropriate post-processes, such as horizontal In the process, it is sufficient to cut out the irregularly shaped portion of the end length veneer together with the narrow plate-shaped body and form it into a square, and since it is continuous, it is easy to draw out the ruler during forming. etc. are facilitated and stabilized, so the yield is improved compared to the conventional case of intermittent sending.

Note that the filler in the above embodiments is not required to have strength in the same direction as the fiber direction of the veneer, so it may be filled with only adhesive, for example.

Furthermore, as is clear from the above examples, there is no problem as long as the width of the filler, the filling location, etc. are set appropriately as necessary, and the key is to fill the space suitable for the purpose of the veneer to be cut. That's enough.

Furthermore, the virtual outline of the raw wood and the virtual cylindrical shape having a diameter somewhat smaller than the virtual outline are not limited to perfect cylindrical shapes, and may have some errors without any practical problems.
Although the axes of both do not necessarily have to coincide completely, it is desirable that they be at least as parallel as possible.

As is clear from the above, according to the present invention, the processing steps after veneer lace can be significantly streamlined compared to conventional methods, and the effective use of valuable wood resources can be expected, and the present invention can be applied to the current situation where the depletion of raw wood is progressing. In light of this, the effects of implementing the present invention in a plywood factory are extremely large.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a perspective view of raw wood, FIG. 2 is a perspective view of composite raw wood, and FIG. 3 is a perspective view showing a state in which the composite raw wood of FIG. 2 is turned. 4 and 5 are perspective views showing the state in which other composite logs are turned. 1... Log, 2... Virtual contour of the log, 3... Space formed between the virtual contour of the log and the log, 4
...Filling, 5...Composite log, 6, 6a, 6b...
... A veneer cut from a raw wood portion, 7, 7a... A plate-shaped body cut from a filler portion, 8... A composite veneer.

Claims (1)

[Scope of Claims] 1 A filler is filled and glued into a space of arbitrary volume in a space formed between a virtual outer shell having substantially the same shape as the circumscribed cylinder of the log and the log, and the filler is bonded to the log. 1. A method for producing a veneer for plywood, the method comprising: creating a composite log consisting of a material, and then turning the composite log. 2. A plywood veneer as set forth in claim 1, which is formed by filling and bonding a filler into the entire space formed between the virtual outer shell, which has substantially the same shape as the circumscribed cylinder of the raw wood, and the raw wood. manufacturing method. 3. Claim No. 3, which is formed by filling and bonding a filler into all of the space formed between a virtual cylindrical shape having a somewhat smaller diameter than a virtual outer shell of approximately the same shape as the circumscribed cylindrical shape of the raw wood, and the raw wood. A method for producing a plywood veneer as described in item 1. 4 Filling the spaces near both ends of the log among the spaces formed between the log and a virtual cylindrical shape with a diameter somewhat smaller than the virtual outer shell of approximately the same shape as the circumscribed cylinder of the log. Claim 1: Adhesive
The manufacturing method of plywood veneer described in . 5. A method for producing a plywood veneer according to claim 1 or 2 or 3 or 4, which uses a wood-based filler.