DE4140024A1 - Multi-layered element of wood or wood in combination with wood-compatible material - has layers in required number and material thickness partly or exclusively part or complete-surfaced prepared as cross-cut wood. - Google Patents

Abstract

On two boards cut parallel to the grain and of the same width the connecting element is applied (eg PVAC glue, contact adhesive, condensation glue, mixed glue). Previously prepared cross cut wood pieces of identical thickness are laid on the width of the one board, and is pressed with the second board. After the completion of the pressing time, the product can be edge-planed and further processed if required. USE/ADVANTAGE - Multi-layered element of wood or of wood combined with wood-compatible material.

Description

Preliminary note

It's an age-old problem in any woodworking activity, treat and edit the cut board in such a way that as little distortion as possible in the end product Swelling and shrinking due to fluctuations in temperature and humidity arise. More details on this are assumed to be generally known.

It is only here in a nutshell to the techniques of doubling, of locking due to transverse fiber (plywood or blockboard) or falling when glued wide connections are remembered.

These ancient techniques have been largely used in the recent past through the industrially manufactured so-called. Chipboard displaced, on their detailed description in the objective context can be dispensed with as it is also adequate is known. The advantages of chipboard are indisputable. It is So far the most reliable method, the strength and the movements to get a grip on the "working wood" or to neutralize. But there are also certain disadvantages of this method were always present and have not been eliminated to date will. So z. B. the load capacity of a chipboard with that grown wood not nearly comparable. Also at technical processing is difficult, for example reliable Make connections or fittings permanently  fasten. It is no secret that made from chipboard Products do not remove the durability and durability of solid products, despite certain Manufacturing technology improvements. The chipboard is more of a disposable product of our fast-paced times.

However, the most serious shortcoming of the chipboard is not to be found in manufacturing and processing technology. Rather, it is based on contexts that only have been seriously discussed in the recent past. Namely in the sum of the facts that humanity disposable products no matter what kind more and more prohibit. However, there is also no treatise on dwindling here Resource resources and pollution take place. But it can probably be assumed that the chipboard address rapidly growing concerns in precisely these aspects is or is already being met. The author assesses these concerns so significant that an equivalent or better replacement must be found for the chipboard.

As a result Multi-layer element described should now take advantage of particle board combine with the advantages of grown wood, the waste minimize valuable wood and at the same time add more Open up possible uses (e.g. the production of viable ones Beam constructions).

Description of the element

As far as the author can judge (who otherwise professionally is not appropriately trained), all woodworking go Professions generally on the assumption that so-called. "End grain" is almost unusable for processing because it is the movements described at the beginning under the influence extreme fluctuations in temperature and humidity having. End grain is understood to mean a cut that  is transverse to the grown fiber (the cutting angle needs but not necessarily to be a right, the transition from Ultimately, brain-to-fiber depends on the cutting angle and the grain relative and fluent). As far as known to the author end grain is only very sporadically because of its special Hardness for paving, for step floors in horse stalls or also used for parquet floors, in the latter case (Parquet floors) remarkable in the editors' circle of editors Faults have occurred. Without denying all of this, the author nevertheless has successful first attempts at descriptive technology with good success. In this technique, boards and boards as well load-bearing elements such as beams are manufactured. As in the protection claim this technique is defined by inclusion characterized by end grain. Pattern 1 demonstratively shows one simple connection of a layer of pulpwood with a Layer of end grain. The properties of such a connection two elements are not yet explained by the author is looking for.

Another step was on the open end grain side Fiberboard attached, with the same fiber both end faces (pattern 2).

Such a three-layer element was the first attempt subjected and has under the influence of extreme temperature and Differences in humidity brought good results. Further Trials are ongoing. So z. B. the end grain layer interrupted by pulpwood from any point of view the grain of the individual layers to each other can be rotated at any angle, the top layer can made of fiber wood, end grain wood or any combination of both elements exist. In turn, the pulpwood itself can be targeted be worked with standing or lying fiber.  

Diagonally cut end grain can be more traditional glued wide connections are toppled, the glue surfaces can be cut at any angle. Nice basic directions can be defined when cutting the block goods (e.g. sharp cutting, prism cutting, rift cutting - see also "Expertise for carpenters", Verlag Europa- Teaching aids, Wuppertal, 12th edition, page 65). The single ones Layers can be laid out plate by plate with any edge connection be prefabricated. After all, everyone can any combination of different types of wood or veneer and other suitable materials (e.g. Formica, laminated panels) to get voted. The possible combinations are almost inexhaustible.

The author now looks at the general rejection of End grain of every kind as a prejudice. On the contrary: Through the use of end grain, the power of the individual Fiber broken in a similar manner to that of particle board, with however the fiber structure in itself according to its natural Growth persists and is wasted large amounts of glue or other binders are dispensed with becomes. In the further development there are also cuts into Eye on eye, which, as far as the author knows, is nowhere to be found are described so. B. targeted at any chosen angle diagonally cut end grain disks or one in any chosen acute angle to the fiber through the trunk ("diagonal") gate cut.

According to the author, this complex of ideas is and in particular with regard to the prejudice mentioned End grain of any kind completely new and therefore patentable.

Description of possible manufacturing processes

Given the variety of possible variations can also the description of corresponding manufacturing ver  driving are not nearly exhaustive. The author limited therefore refer to the already tested example of a Combination of cut approximately parallel to the fiber with wood cut across the grain (end grain). The production This combination should be shown using the example of a three-layer element, the middle layer (Base layer) made of end grain wood and the two outer layers (Top layers) are made of fiber wood. Pattern 2 is ver grasslands.

Procedure 1

Approximately on two boards cut parallel to the grain the connecting element (e.g. PVAC glue, Contact adhesive, condensation glue, mixed glue) abandoned. Before Cut end grain pieces of identical thickness are in board width placed on one of the boards with the second board covered and pressed. After the pressing time, this can Product is trimmed and processed as required.

Procedure 2

Short pieces of waste (raw material savings!) Or poorly structured Solid parts are glued in series along the fiber. The resulting partial product is then trimmed on all sides, the intended board width is given on the front side becomes. This partial product is said to be a "end grain beam" be labeled (pattern 3). To achieve larger desired size Such end grain beams can in turn stack on one another be glued. There will be a on both sides of this bar Glued fiber board. Through the end grain beams are across to the fiber two cuts made in such a way that on each of the glued end grain boards in any intended  Strength remains. On these remaining layers of end grain wood a second fiber board is glued on. The two themselves the resulting products are trimmed and passed on as required is working.

Procedure 3

Analogous to method 2, the fiber boards are doubled intended final product thickness plus cutting allowance selected and glued on both sides with end grain beams of the type described. The fiberboard is then split lengthways into the way that on each end grain bar half the board thickness (less half cutting width) remains. The further processing results from method 2.

Finally, it must be emphasized again that these descriptions of production processes can only be exemplary and were chosen because the writer already tested in artisanal technology. Regarding possible future industrial production using appropriate Machine material naturally also lends itself to the individual Prepare layers over a large area.

Claims (1)

Multi-layer element made of wood or of wood in combination with wood-compatible materials, characterized in that the layers of any number and material thickness used are made partially or entirely over part or all over as end grain of any cutting angle.