DE2301562A1 - CLADDING FOR BUILDING FACADES AND PROCESS FOR THEIR PRODUCTION - Google Patents

Description

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Patent attorney *

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Gesellschaft für HolzK toffberoitung, Basel (Switzerland) Malzgasse 15

Patent application

Cladding for building facades and procedures for their

Manufacturing

The well-known building facades made of bricks, concrete or slabs are usually plastered. However, the known types of plaster generally have the disadvantage that they have the required thermal and acoustic insulation; can only guarantee to a limited extent and that they also, under the influence of the various thermal expansion coefficients dc-.r facade wall and plaster,

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easily prone to cracking.

Other shortcomings of the materials used to date for facade plastering are poor resistance, poor impact resistance, low elongation at break, rigidity, Brittleness and poor bonding ability.

It is also known for thermal and acoustic insulation using specially shaped panels. However, these products are relatively brittle and leave ' therefore use them with difficulty in many cases.

These disadvantages are eliminated thanks to the present invention in that the cladding, from the inside Seen from the outside, a binder, a nonwoven fabric made from plastic fibers and a plastic plaster having.

Said fiber fleece can, depending on the prevailing conditions, be impregnated or with a synthetic one Be coated hardener, on which the actual plaster is then applied. The synthetic fibers of the nonwoven fabric are preferably continuous isotactic fibers. Polypropylene. For the production of the fiber fleece Of course, thermoplastic fibers such as polyamides, polyesters or other homopolymers and copolymers can also be used Find use. The polypropylene offers, however, due to its specific weight and its chemical neutral

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Iitat significant benefits. Its fluidity index i ₂ ^ _Q should preferably be between 2 and 30. This index indicates the weight of the material at 230 ⁰ C, which runs through a nozzle having a diameter of 2.095 mm and length of 8 in 10 minutes. The titer should be between 0.5 and 30 dtex, the toughness between 0.5 and 4 g / dtex and the elongation between 50 and 500 $.

The accompanying drawing shows, in the form of an exemplary embodiment, the composition of a building facade cladding. The building wall is in this case with 1, the binder with 2, the non-woven fabric with 3 * das Hardener with 4 and synthetic plaster with 5 designated.

The fiber fleece is obtained from the polymer by an extrusion process, the polymer through openings corresponding cross-section and precisely defined profile is pressed; those obtained in this way Fibers are passed through under the influence of compressed air Nozzles pulled.

The fiber fleece obtained in this way is needled on a needle machine known per se, so that it has the desired retains its strength and interacts well with its neighboring materials lien connects. The nonwovens can be calendered with Treated latex or provided with another coating ■ that ensures the required tightness. Even

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it is possible to make the nonwovens fireproof with latex or other additives.

The thickness of the cladding can thereby be increased that one reinforces a fiber fleece by folding or superimposes two or more fiber fleeces and nailed together. The weight of these fiber fleeces is advantageously between 100 and 150 g / m 2.

The casing described has great advantages, the use of both for the creation of new buildings as well as for the repair of existing facades. In particular, pay attention to the present advantages pointed out:

- the excellent impact resistance,

- the good notched impact strength,

- The elongation at break, which avoids the formation of cracks, whereby the fiber fleece due to its Structure the undesirable effects of the different coefficients of thermal expansion between balances the facade wall and the cladding,

- the good acoustic and thermal insulation, which in particular avoids cold bridges and

- the possibility of laying even very large slabs or strips.

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In addition to these basic advantages, there is the insensitivity to water, solvents and chemicals Products, the non-rotting properties as well as the impermeability to air and water.

The following examples are only intended to explain the subject matter of the invention and are intended as a limitation the scope of protection outlined in the claims in none Wise one.

example 1

On a concrete wall 20 cm thick and 4 m high, which is exposed to all kinds of weather conditions should be (rain, temperature differences, etc.), two test panels were attached. The first of these Plates received a binder to which adjacent plates of a fiber fleece were attached. These plates had a width of 2 m and a height of 4 m, and a weight of 4θΟ g / m and consisted of fibers with a titer of 15 dtex and a toughness of 3 g / dtex. On the free surface of this fiber fleece was a hardener and a synthetic plaster applied to it. The second experimental plate was only provided with a synthetic plaster. After the two panels were exposed to the weather for only a few months were exposed, you could on the last mentioned

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the same plate determine the formation of cracks, whereas the lining provided with the nonwoven fabric does not have any Showed defects.

Example 2

On a concrete wall 10 cm thick and 5 m High, which also all possible weather influences should be exposed * a test plate was used. brings. On a binder were contiguous Plates of a fiber fleece attached. These plates had a width of 2 m, a height of 5 m and a weight

of 350 g / m and consisted of fibers with a titer of 13 * 5 dtex and a toughness of 2.8 g / dtex. On the free A hardener was applied to the surface of these panels and synthetic plaster was applied to the surface. After this .Wall cladding for a very long time to the effects of the weather exposed, the surface of the plaster remained unchanged. After removing the plaster you could go to the Detect small cracks in the wall. These cracks could not appear in the hardener or in the plaster and remained therefore thanks to the elongation and toughness of the fiber fleece, invisible.

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Example 3

Two test panels were attached to a brick wall 5 m high, the first one in agreement with the present invention had a fiber fleece of 400 g / m 2 with a synthetic plaster; the second test plate consisted of a known polystyrene plate, on which a synthetic plaster was applied. Even when laying it you could see that the second plate gave way at those places where the ladder was placed, which was unsightly Formed pits; Such depressions could not be found in the plate designed according to the invention will. This advantage results from the toughness and elasticity of the textile material that makes up the cladding gives an exceptionally good impact resistance. The binder can be, for example, an acrylic resin. Under An example of the hardening agents that can be used is an acrylic varnish, which may contain synthetic fibers can. As a plastering material, quartz particles are recommended that are made with an acrylic resin-based binder are coated.

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Claims (6)

Patent claims 'Cladding for building facades, characterized in that'these, from the inside to the outside, a Has binding agent, a nonwoven fabric made of synthetic fibers and a synthetic plaster. 2) cladding according to claim 1, characterized in that the fiber fleece with a hardening agent is covered. 3) cladding according to claim 1, characterized in that that the synthetic fibers are continuous fibers made of isotactic polypropylene. 4) cladding according to claim 1, characterized in that the fiber fleece is needled. 5) cladding according to claim 4, characterized in that the fiber fleece is folded or superimposed at least two nonwovens and their needling has a greater thickness. 6) Method of making the cladding ruc ^ 1 / f characterized by being on a Building facade first a binding agent, on this a fiber fleece made of synthetic fibers and on the the latter applies a plastic plaster. The patent attorney 309 82 9/0504