Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1982-07-30
1984-02-07
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
162107, 264277, 428222, 428326, 428364, 428369, 428371, 428537, 428541, B32B 512
Patent
active
044303734
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a reinforced beam section and a method of producing it by means of compression moulding wood particle boards which are internally reinforced with glass fibre at least in zones.
The beam sections primarily envisaged for the application of the present invention are light building beam structures, e.g. with L, U, Z or V section. In the prior art, such beam sections are usually made from metal sheeting which is folded or stamped to the desired section configuration. Rolled or extruded aluminium sections are also available. Although such metal beam structures have satisfactory strength properties, they have certain disadvantages, e.g. sensitivity to corrosion and high thermal conductivity which may lead to so-called "cold bridges" when used, especially in respect of outer walls.
The increased use of light beam sections of metal within the building trade has been primarily brought about by the heavily increasing prices of solid, first-class timber which has up to now been the dominating material in wall beams, floor joists, battons etc. in house structures, for example. To avoid the avoid above-mentioned disadvantages with metal beam structures while holding weight and cost levels down, there have been trials made to produce simplified light beam structures in wood. As examples of such structures can be mentioned I-beams with a web fabricated from wood fibre board and fastened between two timber studs. There are also structures where two thin wood fibre board sheets have been proviede with an intermediate filling of foamed plastics or other insulation material and fixed along their edges against intermediate spacer battons. The machining and assembling operations required in the production of these composite timer beams reduce to a certain extent the material savings gain, thus increasing the cost which is to be compared with the cost of using solid joists or the like.
A basic concept in the realization of the present invention has been that compression moulding of light sheet metal structures in an appealing method of production in itself. If the sheet metal material could be replaced by wood particle material, much would be gained from the aspects of machining and use. In other words, a compression-moulded beam of wooden material should be cheap to manufacture, light and corrosion-resistant and thus be well-suited for use in structures where light building beams, joists and the like are used.
Compression moulding is already known per se in woodworking. Accordingly, such items as seat bottoms and trays are produced by compression moulding (providing the item with a particular configuration under pressure and heat) of plywood, laminated wood etc. Wood particule boards can in a similar way be processed by compression moulding. The problem in using this technique in the manufacture of beams from wood partiicle boards would lie primarily in obtaining required material strength in the finished beam. As opposed to board material and laminated products produced by compression moulding, beam section structures are subjected to very high concentrated loads and shearing loadings which are intended to be taken up and transmitted by means of a section configuration suited to each individual purpose. The basic idea hereby is that the different beam elements shall be put together so that the loading forces acting thereon will act substantially in the longitudinal direction of the beam member towards a point of flexure wherein the section merges at substantially a right angle into another beam member. As a result of the above-mentioned conditions, material stresses will be greatest in the angled zones of the beam section. These stresses will be of such a magnitude that a conventionally compression moulded beam of wood particle board would not resist the loadings prevailing, and would buckle for relatively modest bending and shearing loads, beginning in the angled zones of the section.
The production of a compression moulded beam section fabricated from wood particle board has now been enabled
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