JPS59101310A - Manufacture of aggregate 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 [Technical Field] The present invention belongs to the field of so-called veneer assembly technology for producing high-grade precious wood veneers using relatively low-grade logs.

[Background Art] In the field of veneer lamination technology, various efforts have been made, including dyeing methods for raw veneers, in order to make them as close as possible to natural precious wood (1). For example, various efforts have been made to create a laminated veneer that approximates the grain and appearance of natural pine.

In order to express the appearance faithful to natural pine, the veneer is dyed in the springwood color of pine and has a thickness of 0.6 to 1.5, and the surface of the veneer is dyed to express the thick summerwood. A laminated veneer with a pine-like appearance is created by laminating and pressing sheets colored in the color of summer wood and raw veneers alternately with an adhesive interposed to create a flitch, and slicing this in the straight-grain direction. I was getting .

However, the laminated veneer obtained by the above method did not have sufficient physical properties and abrasion resistance compared to natural veneers. In addition, since two different types of materials are used,
The incidence of eye blurring during slicing was also high. this is,
In particular, this is due to the fact that the dyed veneer itself used to express the spring material is not of sufficient quality.

[Purpose of the Invention] This invention was made in view of the actual situation as described in (2) below, and utilizes the manufacturing technology of laminated veneer to create a laminated veneer with physical properties similar to those of natural pine. The purpose is to provide a manufacturing technology for laminated veneers that can provide the following.

[Disclosure of the invention] In the production of laminated veneers, the raw veneers are subjected to intermediate processing to produce recycled veneers, which are laminated and pressed alternately with sheet-like materials with an adhesive interposed. It is characterized by including a process of tightening and flitching. This will be explained in more detail below.

First, create recycled veneer. For this purpose, a colored adhesive with a coloring agent added between the dyed raw material veneers is used to create a color tone that reduces the conspicuousness of the laminated interface. This is to prevent the surface of the veneer from becoming darkened during dyeing, and when it is processed into laminated veneer, the adhesive interface becomes abnormally dark, reducing its fidelity to nature.) , the flitch is interposed between raw material veneers, and pressed and integrated between flat mold plates, and the obtained flitch is sliced in the straight grain direction (3). In this case, the thickness is preferably 0.3 to Q and 5 mm. Next, the sliced veneers are again laminated with the adhesive interposed therebetween and pressed in a flat plate to obtain a flitch, and the flitch is sliced in the straight grain direction. This operation is repeated twice or more any number of times, and finally the slices are sliced to a pre-designed thickness. In this way, a recycled veneer with high density and uniform veneer physical properties is obtained.

Conventional methods had the disadvantage that the raw veneer deteriorated during intermediate processes such as dyeing, which led to blurring during slicing and reduced product quality.However, recycling treatment improves the physical properties of the veneer. It is reinforced, reduces defects such as glazing, and has the effect of improving the yield of laminated veneers, improving physical properties, and reducing variations.

The recycled veneer obtained as described above can be used as a sheet material of 100 to 300 μm colored in the color of summer wood, such as paper, non-woven fabric, etc.
Alternately with so-called resin vapor obtained by impregnating plastic sheets, paper or non-woven fabric with resin,
They are laminated with adhesive (4), flitched, and then sliced into straight-grained shapes to create the appearance of natural pine.

A more detailed explanation will be given below based on the drawings shown as examples.

FIGS. 1 and 2 are process diagrams showing the manufacturing process of recycled veneer. ■ is the raw material veneer. There are no particular restrictions on the raw material veneer l, but South Sea wood is usually used. Process this into a thin veneer using a rotary lace or the like. The raw material veneer 1 is then bleached and dyed as necessary. Next, they are laminated with the adhesive 2 interposed therebetween, and are sandwiched between flat mold plates 3 and pressed together. The adhesive used in this case is colored so that the adhesive interface between the raw material veneers 1 is not noticeable. The obtained primary intermediate flitch 4 is sliced in the straight grain direction. The obtained veneer is a primary recycled veneer 5.

Next, the primary recycled veneer 5 is laminated and pressed with an adhesive 2 colored in the color described above interposed therebetween to obtain a secondary intermediate flitch 6. In this case as well, a flat mold plate 3 is used. The veneer thus obtained is the second recycled (5) veneer 7. The number of repetitions of such pressing and slicing may be two or more times, and the number of repetitions is arbitrary. In this embodiment, the number of steps is limited to two. FIG. 3 shows the manufacturing process of the laminated veneer. The secondary recycled veneer 7 and the sheet-like material 8 obtained as described above are alternately laminated with an adhesive interposed therebetween, and pressed again with a flat plate mold to obtain a flitch 9.

Next, the laminated veneer 10 with the desired pattern is obtained by slicing using a known method.

In addition, in this invention, matters required for manufacturing a laminated veneer other than those described above may be carried out in accordance with conventional methods. It should be noted that the mold plate used for creating the flitch is not limited to a flat plate type in a strict sense.

Example 1 Agathis wood, a South Sea coniferous tree, was prepared in 1. (I processed a rotary lace onto a veneer of material with a thickness of 100 mL.Next, I first bleached it with hydrogen peroxide and then colored it with acid dye to give it the color of natural pine spring wood. 6) A raw material veneer was obtained.The moisture content of this veneer was adjusted to 30 to 50%.

Next, we determined the pigment formulation that can be mixed with the urethane adhesive so that the surface color of the dyed veneer and the composite color of the colored adhesive applied to the surface of the dyed veneer become the internal color of the dyed veneer. ,
This colored adhesive was interposed between the raw material veneers (applied to the surface of either one or both of the raw material veneers), and was pressed in a flat mold plate. The clamping conditions are clamping pressure 10 kg/
cnl, adhesive application amount 100 g/r+ (, pressing time was 2 hours.

Slice the obtained flitch in the straight grain direction to 0°51-
A primary recycled veneer with a thickness of .

The above-mentioned primary recycled lithium veneer is again sandwiched and pressed in a flat plate-like mold with the adhesive interposed therebetween to obtain a flitch, and the secondary recycled veneer is sliced into 1.0 mm thick slices in the straight-grain direction. Obtained.

Next, we painted 20 pieces of secondary recycled veneer and natural pine summer wood color.
Resin paper with a thickness of 0 μm was laminated with a urethane adhesive interposed therebetween, and the sheets were sandwiched between flat molds and pressed together to form a flitch.

(7) Clamping conditions: Clamping pressure: 15kg/c+A, coating amount: 80
g/nr, pressing time: 3 hours.

The flitch obtained above was sliced so that the straight grain appeared. The sliced veneer obtained here was a highly faithful laminated veneer that closely resembled natural pine. The abrasion resistance, decay resistance, and stain resistance were significantly improved, and physical properties similar to those of WPC-treated natural pine were obtained. Incidentally, when comparing the physical properties with those obtained using only conventional dyed veneers, the following were found.

Conventional method Example elastic modulus [k+r/cn! ] 300±100
800±20 crushing strength [kg/ca 25±1
085±5 Surface Vs Internal color difference 6-15 3 or less Specific gravity 0.35-0.45 0.
6 to 0.65 (8) It has been found that, according to the method of the present invention, defective veneers and veneers with many knots, which were conventionally discarded, can also be utilized, which is useful for resource saving.

Example 2 Tepa wood from Chile has many nodules, but it was removed and dyed in the same way as in Example 1, and pressed twice in a flat plate to create a flitch, and finally 1. (A recycled veneer with a thickness of 100 ml was obtained. In this veneer, the nodules that were noticeable in the dyed veneer became less noticeable after two moldings, and the veneer was equivalent to a uniform veneer.

The pressing conditions at this time were: pressing pressure: 10 kg/cJ, pressing time: 12 hours, adhesive: water-based vinyl urethane, veneer moisture content = 15% or less, adhesive application amount = 100 g/I. there were.

The obtained recycled veneer was laminated and pressed with 300 μm rayon non-woven fabric colored in the color of pine summerwood in a flat plate using urethane adhesive to obtain flitches, which were then sliced and assembled. I got a veneer.

The obtained veneer was similar to the results of Example 1 both in appearance and physical properties.

(9) [Effects of the invention] In this invention, a raw veneer is sandwiched between templates with an adhesive interposed and pressed, sliced to obtain a recycled veneer, and then the recycled veneer is bonded again. The recycled veneer obtained by repeating the process of pressing, flitching, and slicing with an adhesive interposed an arbitrary number of times is laminated with separately prepared sheets alternately with an adhesive interposed, and then sandwiched between molds. The method is characterized in that it is compacted to obtain a flitch and then sliced, resulting in a laminated veneer with excellent physical properties.

[Brief explanation of the drawing]

The figures are process diagrams for explaining the invention in detail. Figure 1 is a process diagram for manufacturing a primary recycled veneer, Figure 2 is a process diagram for manufacturing a secondary recycled veneer, and Figure 3 is a process diagram for manufacturing a secondary recycled veneer. It is a process diagram for manufacturing a laminated veneer. 1 is the material veneer 2 is the adhesive 3 is the flat plate 4 is the primary intermediate flitch (10) 5 is the primary recycled veneer 6 is the secondary intermediate flitch 7 is the secondary recycled veneer 8 is the sheet-like material 9 Ha Fritsch 10 is Patent applicant for laminated veneer Patent attorney Matsushita Electric Works Co., Ltd. Toshimaru Takemoto (2 people) (11) Figure 2/Figure 3

Claims (1)

[Claims] (1) In the production of laminated veneers, raw veneers are sandwiched between molds and pressed together with adhesive, sliced to obtain recycled veneers, and then this recycled veneer is applied with adhesive again. The recycled veneer obtained by repeating the process of pressing, flitching, and slicing with intervening materials is laminated with separately prepared sheet materials alternately with adhesive intervening, and then sandwiched between molds. A method of manufacturing small laminated plates characterized by pressing to obtain a flitch and then slicing.