JPS61102204A - Manufacture of aggregate veneer - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 ［技術分野］ この発明は、木材の加工技術の分野に属する。[Detailed description of the invention] [Technical field] This invention belongs to the field of wood processing technology.

さらに詳しくは木質単板の集成技術の分野に属する。More specifically, it belongs to the field of laminated wood veneer technology.

［背景技術］ 従来、集成単板の製法としては、ロータリーレースして
得た原料単板に、脱色、染色などの前処理を施して素材
単板を調整し、この素材単板の繊維方向（Ｌ方向）を、
第１図に示すように、成形型４の長手方向に対して縦方
向に揃えて積層して（この場合、各素材単板の間には接
着剤を介在さく１） せる）フリッチを得て、つぎにこれをスライスして目的
の集成単板を得ていた。[Background technology] Conventionally, the manufacturing method for laminated veneer involves pre-processing the raw material veneer obtained by rotary lace, such as bleaching and dyeing, to adjust the material veneer, and then adjusting the fiber direction of the material veneer ( L direction),
As shown in Fig. 1, flitches are obtained by stacking them vertically with respect to the longitudinal direction of the mold 4 (in this case, an adhesive is interposed between each material veneer), and then This was then sliced to obtain the desired laminated veneer.

以上の場合、素材単板が含有する水分量が変化すると共
に素材単板の寸法変化が起こり、これが　　　　　　　
　　５そのまま集成単板に反映される。つまり木材には
膨潤、収縮に異方性があり、接線方向゛（板目）：半径
方向（柾目）：繊維方向の寸法変化の比率は１０：５：
１〜０．５であり、その差異は非常に大きい。素材単板
においても、そのような差異が集成単板の性質に大きく
影響する。すなわち前記のように繊維方向を揃えて集成
して得た単板は、天然木と同等の寸法変化を持ち、塗装
を施した際、経時的に干割れ、目ヤセなどの欠陥が発生
する。この干割れは接線方向についての単板の寸法変化
が大きいため、繊維方向に塗膜が割れる現象である。こ
のような欠点を改善するためには集成単板の寸法変化を
少なくする必要がある。In the above cases, the moisture content of the material veneer changes and the dimensions of the material veneer change, which causes
5 It is directly reflected in the laminated veneer. In other words, wood has anisotropy in swelling and contraction, and the ratio of dimensional change in the tangential direction (grain): radial direction (straight grain): fiber direction is 10:5:
1 to 0.5, and the difference is very large. Even when it comes to material veneers, such differences greatly affect the properties of laminated veneers. That is, the veneer obtained by laminating the fibers in the same direction as described above has the same dimensional changes as natural wood, and when painted, defects such as dry cracks and grain fading occur over time. This dry cracking is a phenomenon in which the paint film cracks in the fiber direction due to large dimensional changes in the veneer in the tangential direction. In order to improve these drawbacks, it is necessary to reduce dimensional changes in the laminated veneer.

［発明の目的］ この発明は、集成小板における接線方向の寸法変化を少
なくすることができる集成単板の製法を提供することを
目的とする。[Object of the Invention] An object of the present invention is to provide a method for manufacturing a laminated veneer that can reduce dimensional changes in the tangential direction in the laminated small plate.

［発明の開示］ この発明は、フリッチ成形時に素材単板の繊維方向を型
の長手方向に対して、横方向（素材単板の繊維方向が型
に対して直角になる方向、以下り方向と称する）に積層
して圧締し、フリッチ化する工程を含むことを特徴とす
る。[Disclosure of the Invention] This invention provides a method in which the fiber direction of the raw material veneer is adjusted in the transverse direction (the direction in which the fiber direction of the raw material veneer is perpendicular to the mold, or in the downward direction) with respect to the longitudinal direction of the mold during flitch molding. It is characterized in that it includes a step of laminating and compressing the material (called a "flitch") and forming it into a flitch.

以上のようにして得たフリッチをスライスすることによ
り得た集成単板は、そのＬ方向の伸縮（素材単板のＴ方
向が集成単板のし方向となるため、集成単板においては
、Ｌ方向の伸縮がＴ方向に比べて大きくなる）を接着層
で抑え、結果的に集成単板の寸法変化を天然木に比べて
小さくするものである。以下、実施例により説明する。The laminated veneer obtained by slicing the flitch obtained as described above expands and contracts in the L direction (the T direction of the material veneer is the direction of lamination, so in the laminated veneer, L The adhesive layer suppresses the expansion and contraction in the T direction, which is larger than in the T direction, and as a result, the dimensional change of the laminated veneer is smaller than that of natural wood. Examples will be explained below.

実施例１ 針葉樹であるアガチスを１．Ｏｍｍの厚さにロータリー
レースして素材単板（アガチス本来の木目が目立たない
）を得た。ただし、１×８尺に裁断する際に、Ｔ方向が
長手方向になるようにする。Example 1 Agathis, a coniferous tree, was grown in 1. A material veneer (the original wood grain of agathis is not noticeable) was obtained by rotary lace to a thickness of 0 mm. However, when cutting into 1 x 8 shaku pieces, the T direction should be the longitudinal direction.

つぎに、脱色し、市販の染料で天然杉の色調に合わせて
染色し後、この単板を含水率３０〜４０％に調湿した。Next, the veneer was decolorized and dyed with a commercially available dye to match the color tone of natural cedar, and then the moisture content of this veneer was adjusted to a moisture content of 30 to 40%.

つぎに市販のウレタン系接着剤（市販の顔料で夏材色に
調色したもの）を介在させつつ積層しく型の長手方向に
対し素利単板の繊維方向は略直角になっている）、プレ
ス圧１５　ｋｇ　／　ｃＪで凹凸型により圧締し、フリ
ッチを（Ｍた。これをスライスし、そのスライス単板を
台板に張り付け、ウレタン塗装を施して塗装した後、Ｊ
ＡＳ　（特殊合板）規定されている寒熱繰り返しＢ試験
を行った。干割れの発生は認められなかった。因にスラ
イス単板のし方向、Ｔ方向の寸法収縮比は５／１であっ
た。Next, a commercially available urethane adhesive (colored toned to a summer wood color using a commercially available pigment) is interposed and laminated, so that the fiber direction of the plain veneer is approximately perpendicular to the longitudinal direction of the mold). It was pressed with a concave-convex mold at a press pressure of 15 kg/cJ, and the flitch was made into (M). This was sliced, the sliced veneer was pasted on a base plate, and after painting with urethane,
The AS (special plywood) regulated cold/heat cycle B test was conducted. No occurrence of dry cracks was observed. Incidentally, the dimensional shrinkage ratio of the sliced veneer in the welding direction and the T direction was 5/1.

実施例２ 実施例１において、素材単板として広葉樹であるテパ材
（寸法変化率がアガチスの２〜３％に対して、４〜５％
と大きい）を使用したところ、干割れ発生は大幅に減少
した。しかもし方向、Ｔ方向の寸法変化率は実施例と同
様５／１であった。Example 2 In Example 1, the material veneer was Tepa wood, which is a hardwood (with a dimensional change rate of 4 to 5% compared to 2 to 3% for agathis).
When using a 100% carbon fiber (large), the occurrence of dry cracks was significantly reduced. Moreover, the dimensional change rate in the T direction and the T direction was 5/1 as in the example.

実施例３ 繊維方向が型に平行な素材単板をＡ単板、実施例２にお
ける素材単板（繊維方向が型に直角）をＢ単板としたと
き、この人単板とＢ単板を交互に積層し、圧締してフリ
ッチを得て、これをスライスして得た単板を同様に試験
したところ、干割れの発生は認められなかった。因にこ
のときのし方向、Ｔ方向の寸法収縮はほぼ１となってい
た。Example 3 When the material veneer whose fiber direction is parallel to the mold is A veneer, and the material veneer in Example 2 (fiber direction perpendicular to the mold) is B veneer, this person's veneer and B veneer are When a veneer obtained by laminating alternately and pressing to obtain a flitch and slicing the flitch was similarly tested, no drying cracks were observed. Incidentally, the dimensional shrinkage in the longitudinal direction and the T direction at this time was approximately 1.

［発明の効果］ この発明は、集成単板の製法において、フリッチ成形時
に、素材単板の繊維方向を型の長手方向に対して略直角
として圧締する工程を含むことを特徴とするので集成単
板の寸法変化が減少する効果がある。[Effects of the Invention] The present invention is characterized in that the method for producing a laminated veneer includes a step of compressing the material veneer with the fiber direction substantially perpendicular to the longitudinal direction of the mold during flitch molding. This has the effect of reducing dimensional changes in the veneer.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の製法における素材単板の圧締方向を示す
圧締工程の斜視図、第２図はこの発明の実施例に係る圧
締工程の斜視図である。 １は素材単板単板Ａ ２は繊維方向（Ｌ方向） ３は接線方向（Ｔ方向） ４は型 ５は素材単板ＢFIG. 1 is a perspective view of a pressing process showing the pressing direction of a material veneer in a conventional manufacturing method, and FIG. 2 is a perspective view of a pressing process according to an embodiment of the present invention. 1 is the material veneer veneer A 2 is the fiber direction (L direction) 3 is the tangential direction (T direction) 4 is the type 5 is the material veneer B

Claims (1)

【特許請求の範囲】[Claims] （１）集成単板の製法において、フリッチ成形時に、素
材単板の繊維方向を型の長手方向に対して略直角にして
積層し、圧締してフリッチを得る工程を含むことを特徴
とする集成単板の製法。(1) A method for producing a laminated veneer is characterized by including the step of laminating the material veneers with the fiber direction substantially perpendicular to the longitudinal direction of the mold and pressing them to obtain a flitch during flitch forming. Manufacturing method of laminated veneer.