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AssigneeDansk Eternit-Fabrik A/S
InventorsHerbert E. Krenchel, Jorgen A. Ottosen, Jorgen Balslev
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A fibrous reinforcing element made from oriented polyolefin material for reinforcing a matrix material such as cement has longitudinally varying cross-sections and frayed surface portions from which fibrils extend. The element has cross-sections which vary along its length, a characteristic which combines with the fibrils of the frayed surface portions to facilitate anchoring of the element in the matrix. The anchoring and strength characteristics make the element particularly useful for constructing cement building products or any product produced from a matrix binding agent. The element is in the form of a fiber made from a polyolefin film which is stretched at least fifteen times and then cut by cutting means along lines at least partially transverse to the direction of orientation. In the preferred embodiment a building product formed from a matrix of Portland cement has dispersed therein, a plurality of fibrous reinforcing elements at least a portion of which are the individual polyolefin fibers described in accordance with the invention. By uniquely providing a combination of the inventive fibers with fibers of other types within the cement matrix, improved anchoring and dispersion of the fibers is achieved, while the improved strength characteristics of the elements contributes to a building product of unusually improved strength.
A method of manufacturing a building product comprising mixing a slurry of an inorganic binding agent as a matrix and a plurality of fibrous reinforcing elements at least a portion of which are flexible, organic oriented polyolefin fibers, each having a weight about from 2 to 35 denier and having cross sections which vary along its length and polyolefin fibrils extending from surface portions thereof, and permitting said slurry to set after forming or moulding.
A fiber reinforced building product manufactured from a matrix of an inorganic binding agent and a plurality of fibrous reinforcing elements at least a portion of which includes individual filaments of oriented polyolefin fibers cut from polyolefin filaments cut from polyolefin film material which has been stretched at least about 15 times to a thickness of about from 10 to 60 microns, said fibers having cross sections which vary along their length and polyolefin fibrils extending from surface portions thereof, each polyolefin fiber further having a tensile strength of at least about 4000 kp/cm.sup.2, a modulus of elasticity of at least about 7.times.10.sup.4 kp/cm.sup.2 and a maximum elongation of up to about 8 percent of the length, said fibers being about from 5 to 25 mm in length.
A method of producing a building product comprising the steps of:
A fiber reinforced building product manufactured from a matrix slurry of an inorganic binding agent such as Portland cement and a plurality of fibrous reinforcing elements, at least a portion of which are single filaments of oriented polyolefin fibers each having a tensile strength of about from 4000 to 6000 kp/cm.sup.2, a modulus of elasticity of about from 7 to 10.times.10.sup.4 kp/cm.sup.2 and a maximum elongation of up to about 8 percent, said polyolefin fibers being between 5 and 25 mm in length and having cross sections which vary along their length and frayed edges with fibrils extending therefrom so as to permit anchoring of said fibers in the matrix slurry.
Dependencies are inferred from the claim text.