DE1247923B - Process for the production of cell core plates with a core made of synthetic resin-impregnated paper and cover layers made of pore gypsum - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B28b

German KL: 80 a'46

Number: 1247 923

File number: D 46957 V / 80 a

Filing date: April 3, 1965

Opened on: August 17, 1967

The invention relates to a method of manufacture of cell core plates with a core made of synthetic resin impregnated Paper and cover layers made from porous plaster of paris. In particular, it relates to the connection between core and top layer.

Cell core plates are made using a shear-resistant, made of a variety of cells or Honeycomb existing cell core made, which with prefabricated panels - e.g. plasterboard - Or is covered with a material that is in a liquid to plastic state.

A known method provides, for example, by dipping or pressing in a truncated pyramid Formed core in a mortar wet cell core plates homogeneously in one Piece to manufacture.

This avoids a subsequent application and attachment of cover layers, but the required strength properties can only be achieved with a relatively large basis weight. This process can also be used to manufacture extremely lightweight components.

According to another known method, the core and cover layer are made from cast resin mineral fiber material Injected to form a cohesive composite, with remaining cavities to induce insulating properties can be foamed with different materials.

Although this method makes it possible to produce composite components of small format with low Manufacture weight with a relatively high strength, but it requires expensive fabrics and facilities ahead, which are neither technically nor economically accessible to the demands of industrial construction are.

According to a different procedure a connection is made between cell core and cover layer by adding a synthetic resin that is adhesive during processing to the cover layer mortar brought about, and the shear strength in the area between the core and top layer is through Arrangement of arch-like webs made of the same or a similar building material mixture tried to enlarge.

This allows z. B. lightweight panels can be produced in any dimension required for assembly construction; In addition, a low dead weight in relation to the load-bearing capacity is achieved and, with regard to the raw material and process-related expenditures, a correspondence with the economic conditions of industrial construction
Cell core plates with a core
synthetic resin impregnated paper and
Cover layers made of pore plaster of paris

Applicant:

German Building Academy,
Berlin-Lichtenberg,
Hannoversche Str, 30

Named as inventor:

Robert Trautvetter, Berlin-Pankow

aims, but the properties of the synthetic resin-treated top layers are not optimally used.

The object of the invention is, in the method for producing cell core plates with an im Relative to its load-bearing capacity, it has a low weight and a core made of synthetic resin-impregnated paper Have cover layers made of porous gypsum, the core with the cover layers in a particularly simple and yet effective way to connect.

The object is achieved in that the cell core is initially parallel to its surface plane in a synthetic resin-alloyed gypsum solution is immersed, through this solution drop-shaped in cross-section Widenings of the web ends are generated and the core after the consolidation of the widenings associated with the spread of pore plaster of paris mixture for the top layers, which in the cells foam in and harden, anchored between the ends of the webs.

After the pore plaster of paris has hardened, the cell core and cover layer react to mechanical effects opposite like a unified body. The teardrop-shaped ones enclosed by the pore plaster of paris Ends of the webs of the cells close a detrimental notch effect between the web ends and the pore plaster completely.

The porous gypsum mixture is expediently applied to a glass fiber fleece or to a covering film; the arrangement of a facing material ready for the visible surface on the bottom of the mold makes it unnecessary to use it greasy release agent and completes the factory prefabrication.

709 637/174

Claims (2)

If, instead of the covering film, a diagonally arranged glass fiber fleece is placed on the bottom of the mold, this simultaneously fulfills the task of a conveniently arranged tensile reinforcement. The invention is described and explained in more detail below in an exemplary embodiment and with reference to the drawing. A cell core 1 on synthetic resin-impregnated paper with a large number of honeycomb-shaped cells 2 is - for example, using an auxiliary device equipped with plug-in spikes - ■ immersed about 10 mm deep in a low-viscosity building material solution, which is composed as follows: 5 to 30 parts by weight of a 50 percent dispersion of polyvinyl acetate with 70 to 95 parts by weight of calcium sulfate mixed and mixed with 30 to 60 parts by weight of water. After immersion, the cell core is temporarily stored on the auxiliary device hanging freely in a horizontal position. In the process, drop-shaped widenings 3 are formed at the ends of the webs of the cells and solidify relatively quickly. Once these have hardened, the cell core equipped in this way is provided with a top layer. For this purpose, a glass fiber fleece is laid out on a mold bottom with an edging, the elementary filaments of which run preferably diagonally to the surface and on which the prepared Pörgypsum mixture is spread, which is composed as follows: 2.0 to 6.0 parts by weight of aluminum sulfate, 0.3 to 2.0 Parts by weight of calcium sulfate, 0.2 to 2.0 parts by weight of carbonate of lime mixed with 90.0 to 97.5 parts by weight of calcium sulfate and mixed with 50.0 to 70.0 parts by weight of water. 35 The cell core 1 is now held by means of the auxiliary device with the drop-shaped widening of its web ends in the pore gypsum mixture spread out on the mold bottom, which has already bonded with the glass fiber fleece laid out on the mold bottom, and under the influence of the foaming agents present in the mixture, this now takes place Calcium sulphate hemihydrate exhibits a pore structure when it is converted into a double hydrate. During this process of foaming, the pore plaster of paris mixture grows into the cells! of the cell core 1, where it finally encloses the teardrop-shaped widenings 3 of the web ends. After the short setting time typical of calcium sulfate, the cell core equipped with a cover layer is lifted from the bottom of the mold and the procedure is analogous to the described embodiment on the opposite surface plane of the cell core. A cell core plate produced in this way can e.g. B. can be used for a heat-insulating false ceiling in hall buildings. Patent claims: 1. Method for the production of cell core plates with a core made of synthetic resin impregnated Paper and cover layers made of porous gypsum, characterized in that the core is initially parallel to its surface plane in a Resin-alloyed gypsum solution is immersed, through this solution drop-shaped widenings in cross section of the web ends are generated and the core after consolidation of the widenings associated with the expanded porous gypsum mixture for the top layers which foams into the cells and is anchored between the ends of the webs as it hardens. 2. The method according to claim I _1, characterized in that the pore gypsum mixture is applied to a glass fiber fleece or to a covering film. 1 sheet of drawings 709 637/174 8.67 © Bundesdruckerei Berlin