METHOD FOR PRODUCTION OF CORES FOR DOORS, PARTITIONS, FURNITURE AND THE LIKE, AND SUCH CORES

Abstract: A method for production of cores for doors, partitions, furniture and the like is described, where a filling material is mixed with a binding agent, and where the core is form-pressed in a desired shape, preferably as a plate-shaped item, where biomass is used as filling material, for instance in form of straw and stalks, and where a binding agent is used, mainly consisting of either UF-glue (urea-formaldehyd) or MUF-glue (melamin urea-formaldehyd), and which preferably contains a foaming agent; and a core provided as a form-pressed mainly plate-shaped item, where the filling material consists of biomass, for instance in form of disintegrated straw and stalks, and where the binding agent mainly consists of UF-glue or MUF-glue, to which a foaming agent preferably is added.

Description: Method for production of cores for doors, partitions, furniture and the like, and such cores The present invention relates to a method for production of cores for doors, partitions, furniture and the like and of the type described in the introductory part of claim 1. Known cores for doors, partitions, furniture and the like consist mostly of cardboard, chip board or wood, as it is common to use cores made from cardboard, if it concerns very easy and cheap constructions, for instance door plates; while the normal alternative, if more strength is needed, is chip board, which in return involve a more expensive and more heavy construction, for instance of plates for doors and furniture. The invention has for its purpose to provide a method for production of cores of the type described in the introductory part, and which makes it possible to produce improved cores, which are easy to optimize for the actual use, and which are easy to integrate in relation to the form in the finished item, for instance profiled plates for doors or furniture. The method according to the invention is distinctive in that biomass is used as filling material, for instance in form of straw and stalks, and that a binding agent is used, mainly consisting of either UF-glue (urea-formaldehyd) or MUF-glue (melamin urea- formaldehyd), and which preferably contains a foaming agent. By means of simple pro- visions it hereby becomes possible to produce improved cores of the type described in the introductory part, which are easy to optimize to the actual use, and which are easy to integrate in relation to the form in the finished item, for instance profiled plates for doors or furniture. Appropriately the apparatus according to the invention may be such modified, that the core is form-pressed in plate-shape, and that the core afterwards is milled in shape for use in profiled doors and furniture plates. Alternatively the method according to the invention may be such modified that the core is form-pressed between pre-fabricated shells with desired shape corresponding to the profiling of the finished door plate or furniture plate. And for special situations prefabricated shells with asymmetric profiling may advantageously be used - for instance in such a manner that door plate or furniture plate are having a plane inner side and a profiled outer side. The invention furthermore relates to a core produced in accordance with the method according to the invention, and provided as a form-pressed mainly plate-shaped item, which core is distinctive in that the filling material consists of biomass, for instance in form of disintegrated straw and stalks, that the binding agent mainly consists of UF-glue or MUF-glue, to which a foaming agent preferably is added. Appropriately the core according to the invention is provided as a form-pressed plate, which after the hardening is milled in shape for use in profiled doors and furniture plates. Preferably the core according to the invention is furthermore provided as a laminate as the core is form-pressed between pre-fabricated shells with shape corresponding to the desired profiling of the finished door plate or furniture plate. Most advantageously the core according to the invention may be such provided, that the filling material is partly disintegrated, preferably in bundles of fibre in such a manner, that the core is having a uniform pore structure (dentity profile). The invention is explained in more detail in the following with reference to the drawing, which shows some examples or embodiments for items provided with cores according to the invention. Hindmost a cut through profiled door plate at full lenght painted white is shown, to the left a corner part of a two-sided profiled door plate is seen, and in the right, lower side of the view a corner part of a profiled door plate painted white, a plane building plate and outmost to the right a core for a profiled door, for instace for a kitchen cupboard are seen in succession. It shall be emphasized, that the method respectively the core according to the invention primary is intended for use by production of plates for doors or furniture; but it will of course be within the scope of the invention to use the method respectively the core more generally, for instance for constructions (partitions, floors and table tops). In connection with the method respectively the core according to the invention the fol- lowing trade marks are used: BioCore for the core material itself and plates generally, BioDoor , BioBoard , and BioPanel for door plates and for building plates. It is expected, that for instance door plates and building plates are produced in accordance with the invention by adding of fire restrictive additives, for instance vermiculi- te, may fulfil the existing specifications for fire doors (BD30 and BD60).

Claims: CLAIMS 1. A method for production of cores for doors, partitions, furniture and the like, where a filling material is mixed with a binding agent, and where the core is form-pressed in a desired shape, preferably as a plate-shaped item, characteriz d in that biomass is used as filling material, for instance in form of straw and stalks, and that a binding agent is used, mainly consisting of either UF-glue (urea-formaldehyd) or MUF-glue (melamin urea-formaldehyd), and which preferably contains a foaming agent. 2. A method according to claim 1, characterized in that the core is form- pressed in plate-shape, and that the core afterwards is milled in shape for use in profiled doors and furniture plates. 3. A method according to claim 1, characterized in that the core is form- pressed between pre-fabricated shells with desired shape corresponding to the profiling of the finished door plate or furniture plate. 4. A method according to claim 3, characterized in that pre-fabricated shells with asymmetric profiling are used - for instance in such a manner that door plate or furniture plate are having a plane innerside and a profiled outer side. 5. A core produced according to the method according to claim 1 and provided as a form-pressed mainly plate-shaped item, c h a ra c t e riz e d in that the filling material consists of biomass, for instance in form of disintegrated straw and stalks, that the binding agent mainly consists of UF-glue or MUF-glue, to which a foaming agent preferably is added. 6. A core according to claim 5, characterized in that it is provided as a form- pressed plate, which after the hardening is milled in shape for use in profiled doors and furniture plates. 7. A core according to claim 5, c h a ra cterized in that it is provided as a laminate as the core is form-pressed between pre-fabricated shells with shape corresponding to the desired profiling of the finished door plate or furniture plate. 8. A core according to claim 5, characterized in that the filling material is partly disintegrated, preferably in bundles of fibre in such a manner, that the core is having a uniform pore structure (dentity profile).

Inventors: SCHOU LARS, SCHOU, LARS
Applicants: FIBERTECH SYSTEMS A S, SCHOU LARS, FIBERTECH SYSTEMS A/S, SCHOU, LARS
Application year: 1997
Main classification: E06B3
IPC codes: B27N3, E04C2, E06B3