JPH0331563B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention involves first cutting a veneer into a square shape, which is obtained by rotary cutting a relatively short raw wood, and then cutting it into a long piece by vertically splicing or horizontally cutting the veneer. The present invention relates to a method for manufacturing a laminated veneer material by laminating a desired number of veneer sheets.

``Prior art'' Generally, laminated veneer materials are laminated and bonded sequentially with their fiber directions parallel to each other, but since the veneer is long in the longitudinal direction, it is usually The desired length is obtained by sequentially vertically splicing the sheets in parallel with each other, and the desired number of sheets are laminated.

Conventionally, various proposals have been made for manufacturing this type of laminated veneer material, taking into consideration bending stress, load, strength, manufacturing process, etc.
"Method for manufacturing continuous plywood" disclosed in Publication No. 75313
In this method, the longitudinal joints of the veneers are laminated and bonded with vertically shifted phases to cope with bending stress.

In addition, as in the "laminated board" disclosed in Utility Model Application No. 51-173 and Utility Model Application No. 51-174, a plurality of veneers are laminated with the same fiber direction in the longitudinal direction. Some of the sheets are interposed with a veneer orthogonal to the fiber direction, so that the bending strength in the direction perpendicular to the fiber direction is increased.

Furthermore, although it does not actually describe laminated veneer materials, JP-A-51-144710 contains a description of a ``method for manufacturing plywood,'' and according to this, a two-layer support core is made. Each layer veneer has the same thickness, and the unit veneer that is cut is made by joining two unit veneers in the shape of a square with the short side length of the front and back veneers as one side, and making the length the same as the front and back veneers. We are trying to simplify the manufacturing process by reducing the number of board types.

``Problems to be Solved by the Invention'' However, these proposed methods cannot effectively utilize the thinned wood, which is produced in large quantities in areas where timber is harvested, and the bent roots of main felling. In other words, the laminated veneer material of the present invention can be produced by processing these low-quality logs into a laminated veneer material while simplifying the manufacturing process.
It compensates for the lack of dimensions that occurs when raw wood is directly sawn, disperses and alleviates defects in the material such as cuts, and makes it a general construction material that is stable in terms of strength and dimensional modification.

In artificial afforestation, in order to encourage the growth of trees, cutting is mainly done in proportion to the growth condition of the trees, and the wood that is discharged at this time is called thinning wood, and the amount of it is enormous. It is. This thinned wood has traditionally been used for limited purposes such as scaffolding logs, shafts, and rafters, but recently, the demand for it has been steadily decreasing.

Furthermore, since trees in mountainous areas are usually planted on slopes, many of the trees in areas with heavy snowfall are so-called bent-root trees, which have a curved part at the bottom of their trunks, and the amount of these trees is quite large. Because this bent-root material has inferior properties, it is only used for some industrial purposes, and most of it is left unused without any rational use.

``Means for Solving the Problems'' In view of the above, the present invention aims to effectively utilize thinned wood and root bent wood, and to disperse defects, strength and character defects of these woods. Alternatively, the present invention provides a method for manufacturing a veneer laminate material for general construction that is relaxed and has strength stability and dimensional stability.

``Operation'' A veneer cut to a uniform thickness is cut to a fixed size into a square shape, and the sides are successively vertically spliced in the direction of the fibers to obtain a long vertically spliced veneer of a predetermined length. Apply adhesive to one or both sides of a set of multiple pieces of longitudinally spliced veneer, and then stack and bond each vertically spliced veneer with the phase shifted in the vertical direction to create a plurality of long vertically spliced veneer laminates. do. On the other hand, between the plurality of long vertically spliced veneer laminates, the square veneer is successively cross-cut in a direction perpendicular to its fibers to have the same length as the long vertically spliced veneer. This method involves laminating and bonding veneer veneers by applying adhesive and inserting them.

“Example” An example of the method of the present invention will be described below with reference to the accompanying drawings.

That is, thinned timber 1 felled in a mountainous area is cut into short timbers 2 with a maximum length of 3 shaku (909 mm), the transport and collection location is made simple, and the collected short timbers 2 are cut into veneer lace (not shown), etc. The veneer 3 is cut into a veneer 3 having a uniform veneer thickness within the range of 3 mm to 9 mm.

Next, after drying, this veneer 3 is sequentially cut to have the same length as its width, that is, into a square shape, to obtain a square veneer. ) etc. to form a square veneer 4.

After drying, the square veneers 4 are longitudinally spliced side by side sequentially in the fiber direction to obtain a long longitudinally spliced veneer 5 of a predetermined length. Alternatively, apply a synthetic resin adhesive such as emulsion type or formalin type to both sides, and stack and bond by shifting the phase of each longitudinal joint part in the vertical direction at least 16 times the thickness of the veneer 3 between adjacent layers. , hot pressure or cold pressure is applied to once form a long vertically spliced veneer laminate 6, and then a plurality of this long vertically spliced veneer laminate 6 are created.

On the other hand, the square veneer 4 after drying is successively horizontally serrated from side to side in the direction perpendicular to its fibers, and a long horizontally serrated veneer 7 having the same length as the long longitudinally spliced veneer 5 is optionally obtained. After obtaining the number of sheets, apply the resin adhesive between the long longitudinally spliced veneer laminates 6, insert and laminate one long horizontally wavy veneer 7, and apply hot or cold pressure. A laminated veneer material 8 is used.

When vertically joining the square veneers 4, it is possible to use any known method such as butt joint, finger joint, scarf joint, etc. In this example, for convenience, an example of scarf joint is shown. A butt joint is usually used for crosscutting.

The long vertically spliced veneer laminate 6 is usually composed of two to three long vertically spliced veneers 5, and the number of these is also 2 to 3 when making one veneer laminate 8. However, depending on the desired thickness of the veneer laminate 8 and the cutting thickness of the veneer 3 cut by veneer lace etc., the number or number of veneers can be changed. Material 6
The number of long horizontally serrated veneers 7 inserted between them is also variable.

Furthermore, the pressed veneer laminated material 8 is cut into appropriate widths in the width direction to prevent exposure of the base material or adhesive layer of the veneer 3 when used as general construction materials such as columns and beams. It is also optional to attach a decorative material.

"Effects" As described above, according to the present invention, a veneer cut to a uniform thickness is once cut to a fixed size into a square shape,
The sides are longitudinally spliced one after another in the direction of the fibers to obtain a long vertically spliced veneer of a predetermined length. A plurality of these long spliced veneers are made into a set, and adhesive is applied to one or both sides of the veneer. A plurality of long longitudinally spliced veneer laminates are created by laminating and bonding each vertically spliced part with the phase shifted, and the square veneer is placed between the plurality of long vertically spliced veneer laminates in the fibers. Compared to the conventional example described above, the long horizontally spliced veneers are successively horizontally sliced in orthogonal directions to have the same length as the long vertically spliced veneers, and are then laminated and bonded by applying adhesive. In particular, the number of manufacturing steps can be simplified.

In other words, the veneers cut from short pieces of wood have a single thickness and are all cut into square shapes, and based on these square veneers, multiple pieces of long vertically spliced veneer laminates can be created, or long pieces of It becomes easy to process into a horizontally carved veneer, which reduces the number of subsequent manufacturing steps and improves workability. Furthermore, as in the conventional example described above, when creating a laminated material of a plurality of long longitudinally spliced veneers, care is taken to prevent the longitudinal joints of the long longitudinally spliced veneers from overlapping. Since it is glued together and a long horizontal slat veneer with the fiber direction orthogonal is inserted between them, it is strong against bending stress and can increase the strength in the width direction and reduce warping.

Furthermore, the present invention focuses on the effective use of thinned and bent wood from small-diameter trees, which are produced in large quantities in felled areas.
A movable plant has been devised to cut the material into short lengths (909 mm) to simplify the collection work, and to carry out the manufacturing method of the present invention in the mountainous area of the logging area. , for example, can be implemented with the cooperation of forestry workers, etc., and can consistently and rationally solve the process from collection work to laminated veneer lumber.

[Brief explanation of the drawing]

The drawings are schematic perspective views of an embodiment of the manufacturing method of the present invention, and FIG. 1 is a perspective view showing thinned wood;
Fig. 2 is a perspective view of obtaining a veneer from short pieces of lumber, Fig. 3 is a perspective view of a long longitudinally spliced veneer, Fig. 4 is a perspective view of a long longitudinally spliced veneer laminated material, and Fig. 5 is a perspective view of a long longitudinally spliced veneer. FIG. 6 is a perspective view showing a long horizontally elongated veneer, and FIG. 6 is a perspective view showing a veneer laminated material. 1... thinned wood, 2... short wood, 3... veneer, 4
...Square veneer, 5...Long vertically spliced veneer, 6...
Long vertical jointed veneer laminate, 7...Long horizontal jointed veneer,
8...Laminated veneer material.

Claims (1)

[Scope of Claims] 1 A veneer cut to a uniform thickness is once cut to a fixed size so as to have a square shape, and the sides are sequentially vertically spliced in the direction of the fibers to form a long vertically spliced veneer of a predetermined length. A plurality of these long longitudinally spliced veneers are made into a set, coated with adhesive on one or both sides, and laminated and bonded while shifting the phase of each vertically spliced part in the vertical direction to produce a long longitudinally spliced veneer laminate. A plurality of veneers were created, and between the plurality of long longitudinally spliced veneer laminates, the square veneers were successively cross-cut in a direction perpendicular to the fibers to have the same length as the long longitudinally spliced veneers. A method for producing a laminated veneer material, which comprises applying an adhesive, interposing and laminating and bonding long horizontally slatted veneers. 2. The method for producing a laminated veneer material according to claim 1, wherein the thickness of the veneer is 3 mm to 9 mm.