PRODUCT OF BUILDING OF WOOD WOOL SPLINTERS

The invention concerns a building product and/or a substantial component of a building product, in each case excluded floor mats, which according to prEN 13501-1 (European standard draft) be classified can.

A building product or a substantial component of a building product is the center of attention, with which wood wool splinters under training of a open-porous structural body are connected with a bonding agent among themselves (so-called HWL products).

Gemäß the European standard EN 13168 (May 2001) long wood shavings from wood are called also Holzwolle. Because of the further terms and symbols to the EN 13168 is referred.

HWL Bauprodukte are under the mark “HERAKLITH” well-known and can as plates be ready-made. The HERAKLITH&reg mentioned; - Plates are bound cement, in particular a magnesitischen cement, with an inorganic bonding agent, for example. They possess a gross density between 250 and 700 kg/m3 and find various in the building industry application.

In the FR 1,417,698 such a plate from Holzwolle and an inorganic bonding agent is described, with which the cavities of the plate are filled with a synthetic foam material. In this way an extremely porous matrix is to be trained and at the same time the mechanical stability of the plate to be increased.

A wood wool panel with a open-porous stand from consolidated Holzwolle describes the WHERE 94/04473, whereby the wood wool particles are superficially inkrustiert with a Bindemitel, which exhibits a foam structure. In this way is größ eres Porenvolumen in the plate to be trained.

Products of building of wood wools of the aforementioned kind worked in principle. The lightweight construction construction has however the disadvantage of an only limited heat accumulator capacity. To that extent it comes to relatively strong variations in temperature in buildings, which are equipped with these products.

Task of the invention is it to improve such a building product (or a substantial component of such a building product) on basis of wood wool splinters, which are connected with a bonding agent among themselves, regarding its retention of heat.

The invention is the basis the following consideration: There is well-known so-called latent heat storages, with which warmth or cold weather in a phase conversion is stored. If such a material is melted, warmth is used, without the temperature increases. Only if the entire material of the latent heat storage melted, the temperature continues to rise. In other words: the use of such a latent heat storage can stop a temperature rise within a certain, usually close temperature range, for a certain time.

If one integrates such a latent heat storage into a building product of the kind mentioned, whose fusing temperature is adapted on the respective range of application, such a building product can withdraw warmth from the environment atmosphere, without becoming even warmer. Thus such a building product proves within certain limits as alternative to an air conditioning system, which becomes redundant thereby. At the same time energy (for the air conditioning system) is saved and the environment is relieved.

The managing remarks are valid similarly for a substantial component of a building product. Below the term “building product” covers accordingly always also a substantial component of a building product.

In its most general execution form the invention concerns a building product or a substantial component of a building product, which exhibit the following in each case characteristics:

• Wood wool splinters, which are connected among themselves with a bonding agent under training of a open-porous structural body,
• at least one, in the structural body distributed, totally enclosed latent heat storage.

The packaging (casing) of the latent heat storage is important, in order to always hold the additive in continuous manufacturing in the structural body. The casing (cap) ensures for the fact that the memory material not “ausfließ t”, if its fusing temperature is reached or exceeded.

In order as good a distribution of the latent heat storage in the building product to received as possible, the caps, for example plastic caps, should be as small as possible. They can exhibit a diameter clearly smaller 1 mm, for example within the range 0.005 to 0.2 mm. By the small Größ e of the caps is very gro&szlig the total surface; and the heat exchange optimizes.

The latent heat storage can consist for example of or several of the following materials: Wax, paraffin, Fett-alkohol, fatty acid, salt hydrate.

These materials, for example paraffin hydrocarbons or salt hydrates such as hydrates of Natriumcarbonat, Natriumacetat, calcium chloride and/or lithium magnesium nitrate exhibit a high heat of fusion (transformation heat), that are the amount of heat, which is needed at the respective fusion point for the transition of the firm to the liquid condition.

On the basis of the use one erfindungsgemäß EN of building product as basic or basic construction body in the above ground construction and on the basis of the premise that prefers apartment and work spaces a more or less constant temperature between 18 and 24° C exhibit should, plans an execution form of the invention, latent heat storages with a fusion point between 18 and 30° C to use after execution forms between 18 and 24 or 20 and 25° C.

The concrete selection of the latent heat storage depends on the respective range of application. This is valid also regarding the respective heat of fusion, which lies for example in the range 100 to 300 J/gK.

The micro caps mentioned can be integrated problem-free during an actually well-known production process for the building product.

A possibility consists of interfering the micro caps into that liquid to viscously prepared bonding agents which anschließ end with the Holzwolle one mixes. Likewise the totally enclosed latent heat storages can be brought also into the initially mentioned bonding agent foam and processed with this further. No change of the production process is necessary in relation to conventional products of building of wood wools.

A further alternative consists of it, after the production of a conventional product of building of wood wools, to up-strew but at one time, at which the bonding agent is “sticky” still, the mentioned micro caps on the surface of the building product or up spraying and if necessary by a Druckkörper, like a roller to fix if necessary additionally in the surface range of the building product. Likewise the building product can be flooded or dipped in a bath from or with Mikrokaspeln.

In all cases the bonding agent serves thus to hold micro caps after hardening by precipitation of the bonding agent.

Likewise it is possible to moisten or impregnate the wood wool splinters before the processing easily, for example with a fire protection means, whereby the appropriate liquid shows a certain sticking effect, which is sufficient, to hold the mikronisierten caps to the surface of the wood wool splinters.

The caps can be distributed over the entire volume of the building product. In addition, the distribution can be limited to certain zones, in particular surface zones of the building product. Their quantity depends on the heat accumulator capacity wished in each case. Them amount to for example 5 to 50 Gew. - %, related to the total mass at wood wool splinters and bonding agents. Usually a portion under 30 Gew becomes. - %, for example between 10 and 20 Gew. - % or 15 to 25 Gew. - % sufficiently its. The under and upper limits mentioned are to be adapted examples and to the respective application.

Erfindungsgemäß trained building product can exhibit, depending upon kind and quantity of the used latent heat storages (also phase CHANGE material called), a heat accumulator capacity, which corresponds to the one concrete or brick wall, despite its open-porous structure (and according to small gross density) as well as clearly smaller thickness.

For example the thermal capacity corresponds to a wood wool panel of the kind mentioned, the 25 Gew. - % one or several of the totally enclosed latent heat storages mentioned enclosure with a material thickness of 2 cm of one about 20 cm thick brick or concrete wall (- covers) in the relevant temperature range between 18 and 30 and/or 20 and 25° C. thereby can the latent heat storage for example an alkane be, which melts between 20 and 25° C and whose heat of fusion approx. 200 J/gK amounts to.

Regarding the selection of the wood wool splinters and the bonding agent can be fallen back to the state of the art. Wood wool splinters (also wood wool fibers called) exhibit usually a length of more than 8 cm, a width of 1 to 5 mm and a thickness from 0,2 to 0.5 mm. Apart from the total portion of open porosity within the building product also the individual wood chip exhibits a substantial open (micro) porosity (so-called cells). The total portion of open porosity within the building product can for example between 50 and 80 VOL. - % amount to.

As bonding agent in particular an inorganic bonding agent is used, for example a bonding agent on basis MgO (MgO Kauster). Just as the bonding agent in addition, an organic bonding agent can be, for example an acrylic monomer, a solution or a dispersion of a Polyacrylats, a strength or such a thing.

The building product can be supplemented by additives, for example to fire protection means. Also to that extent can be fallen back to the state of the art.

Further characteristics of the invention result from the characteristics of the patent claims.