This is especially important when the cross-plied material will be used in a ballistic resistant article.
"Substantially abuts" is meant to encompass not only fully butted edges but also slightly overlapped edges of the second, discontinuous plies.
The preferred first supply means comprises a roll on which the first ply of material and the first carrier web are wound together, and the preferred first pull means comprises a pair of driven pinch rolls downstream of the cross-plying zone.
The method features the steps of advancing the first ply of material into a cross-plying zone; sequentially laying the second plies of material coplanarly on the first ply in the cross-plying zone with the longitudinal axis of each of the second plies rotated relative to the longitudinal axis of the first ply; preconsolidating the first and the second plies; and withdrawing the cross-piled material from the cross-plying zone.
The cross-piled material produced can be rolled up in a bolt, which also forms part of this invention, for subsequent processing or use. Field of the Invention The present invention relates to method and apparatus for the continuous, automatic production of cross-plied material, preferably for structural or anti-ballistic end uses and preferably for supply in roll form, i.e., like a bolt of cloth, for subsequent processing or use.
I am the first person in North America to complete all three stages of extended limb lengthening for dwarfism.
Over the course of three surgeries (tibias/fibulas, femurs, humeri) my orthopaedic surgeon basically took me from four feet to five feet and lengthened my arms as well.
There would be less waste of material, and thus less expense to the customer, if the composite material could be furnished in continuous roll form, i.e., like a bolt of cloth, rather than in squares or rectangles. 4,403,012, 4,457,985 and 4,916,000, all of which are hereby incorporated by reference. This patent is exemplary of the prior art represented by the SPECTRA SHIELD material discussed above. The present invention provides a method and apparatus for the continuous, automated cross-plying of material, preferably for anti-ballistic end use or in impact resistant structural components, e.g., radomes, sonar domes, helmets.
This would permit the customer to maximize material usage by continuously repeating the pattern to be cut from the continuous length of material and thereby eliminate the scrap formed by using rectangular sheets. In one embodiment, the apparatus is for the automated cross-plying of a first, continuous ply of material and a plurality of second, discontinuous plies of material into a cross-plied continuous length of material, each of the first and the second plies of material having a longitudinal axis.Average section 29 m2 for the passage and 120 m2 for the tunnel.Mechanical excavation of the cap under the protection of preconsolidating jetting columns followed by excavation of the bench.The preferred means for withdrawing the cross-plied material from the cross-plying zone is a take-up roll.The means for sequentially laying the second plies of material preferably comprises, in combination: a second carrier web on which the discontinuous plies are separately carried; second pull means to pull the second carrier web with the discontinuous plies thereon so that each discontinuous ply and the first ply face each other in the cross-plying zone; and means for guiding each discontinuous ply and the first ply into contact with one another.A process for preconsolidating a planar porous fiber-thermoplastic resin layer which is unconstrained in the in-plane directions by heating the layer to above the melting point of the resin, then applying pressure to the plane of the layer causing resin flow, thus orienting the fibers in the plane of the layer.