Method and a system for manufacturing shaped objects of wood dust
AssigneeMix-Wood ApS
InventorUlrik F. Andersen
Life of this patent
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Abstract
A moulding process and system for producing small wooden objects such as, for example, pipe heads or furniture handles from a moulding material formed of an aqueous suspension of wood dust. The moulding material is injection moulded into injection mould parts in which electrodes are placed for subjecting moulding cavities to a HF-heating field such that both a rapid curing of a heat setting glue agent in the aqueous wood dust mass and a rapid driving out of a major part of the water is realized. The moulding cavities include exhaust or release channels for steam resulting from the evaporation of the water of the moulding material and an arrangement is provided for maintaining the mould parts together in spite of the high steam pressure developed in the mould cavities.
Claims5
A method of manufacturing moulded bodies of a moulding material containing wood dust, a heat activated glue agent and water the method comprising the steps of injection moulding the moulding material into a mould cavity provided in opposed mould parts fashioned of a hard, heat resistant and dielectric material, subjecting the moulded body to an HF heating field between a metallic plate electrode located in the respective tool mould parts spaced behind a bottom portion of the mould cavity so as to promote a curing of the glue agent and promoting an expulsion of the water from the moulded body by evaporation of the water, venting steam resulting from the evaporation through at least one channel connecting the mould cavity with the environment, and, at least initially holding the mould parts together with a pressure sufficient to resist a pressure of steam created by rapid heating of the moulded body.
A system for manufacturing moulded bodies of a moulding material containing wood dust, a heat activated glue agent and water, the system comprising a mould including mould cavities, means for introducing the moulding material under pressure into the mould cavities, wherein said means for introducing includes an injection moulding system said mould cavities being defined between opposed mould parts of the mould, wherein means are provided for holding said mould parts against each other so as to define said mould cavities, and wherein the mould parts are fashioned of a hard heat resistant and dielectrical material, with each of the mould parts being provided with a metallic HF electrode plate mounted spaced behind respective bottom portions of the mould cavities, and channel means are provided in the mould parts for connecting the mould cavities for communication with the environment for enabling a release of steam caused by evaporation of the water contained in the moulding materials from the moulded bodies.
Dependencies are inferred from the claim text.