Processes for making high-performance polyethylene multi-filament yarn are disclosed which include the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DR.sub.fluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DR.sub.solid of at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dn and length Dn with Ln/Dn of from 0 to at most 25, to result in a draw ratio DR.sub.fluid=DR.sub.sp*DR.sub.ag of at least 150, wherein DR.sub.sp is the draw ratio in the spinholes and DR.sub.ag is the draw ratio in the air-gap, with DR.sub.sp being greater than 1 and DR.sub.ag at least 1. High-performance polyethylene multifilament yarn, and semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites, are also disclosed.

A multilayer composite includes adjacent filler layers having a filler material dispersed within a first polymeric matrix and an intervening-layer disposed between the adjacent filler layers. The intervening-layer comprises nanoplatelets embedded within a second polymeric matrix and are aligned substantially parallel to the adjacent filler layers. The intervening-layer is configured to fail upon application of a force to the multilayer composite that is greater than or equal to a predetermined force threshold.

The invention relates to a composite sheet, and a ballistic resistant article, comprising unidirectionally aligned high performance polyethylene (HPPE) fibers and a polymeric resin, wherein said polymeric resin comprises a homopolymer or copolymer of ethylene and wherein said polymeric resin has a density as measured according to ISO1183 of between 930 and 980 kg/m3, and a peak melting temperature of from 115 to 140° C.; and said polymeric resin is present in an amount of from 5 to 25% by weight based on the total weight of the composite sheet. It further relates to a method for manufacturing a composite sheet comprising assembling HPPE fibers to a sheet, applying an aqueous suspension of a polymeric resin to the HPPE fibers, partially drying the aqueous suspension, optionally applying a temperature and/or a pressure treatment to the composite sheet.

Ballistic resistant composite materials having high positive buoyancy in water are provided. More particularly, provided are foam-free, buoyant composite materials fabricated using dry processing techniques. The materials comprise fibrous plies that are partially coated with a particulate binder that is thermopressed to transform a portion of the binder into raised, discontinuous patches bonded to fiber/tape surfaces, while another portion of the particulate binder remains on the fibers/tapes as unmelted particles. The presence of the unmelted binder particles maintains empty spaces within the composite to materials which increases the positive buoyancy of the composites in water.

Laminates and their process of manufacture, with the laminates made with anti-ballistic materials, such as woven and unwoven fabrics. The laminates are provided with different structures, materials, bondings, and other features, and example methods of manufacturing those laminates efficiently and in mass quantities. The method of production is a process of laminating individual flexible sheets including anti-ballistic material (which may be of woven or unwoven cloth or thin solid sheets or foils comprised of one or more light-weight anti-ballistic materials) into a flexible laminate for use to protect people or spaces from ballistic objects such as bullets and shrapnel from weapons and other moderate to high-kinetic energy objects

An entryway door is capable of withstanding direct hit hurricane loads and subsequent water surge for long periods. A door slab is formed of reaction-injected-molded aliphatic polyurethane having an outward face, and inward face, and a peripheral edge, with a window opening formed therethrough. A ballistic glass-clad polycarbonate laminate window is provided which sized larger than the window opening. The laminate window having a central light transmissive region and an outer boarder region. A primer is applied to the outer boarder region of outward and inward faces of the laminate window. The door slab is reaction-injected-molded about the laminate window with the outer boarder region extending into and is bonded to a portion of the door slab forming the window opening. The preferred door in mounted to a structure in an outwardly opening manor with a seal entrapped between the periphery of the door and a door jam.

A ballistic plate of a bulletproof jacket includes a bulletproof distribution pad and a shock-absorbing pad in which the bulletproof distribution pad is configured by sequentially arranging from the front a heatproof shock-absorbing sheet at the front, a heatproof distribution sheet having high heat resistance and distributing shock, and a bulletproof sheet absorbing and distributing shock; the shock-absorbing pad is configured by sequentially arranging from the front a first heatproof shock-absorbing sheet at the rear, a flex pelt absorbing shock, and a second heatproof shock-absorbing sheet at the rear; and the heatproof shock-absorbing sheets at the front and the rear are each formed by attaching a polyurethane-based resin film or a PVB film to one or more of the front surface and the rear surface of an aramid fabric woven such that aramid fabric threads are arranged to cross each other at right angles in a crossover pattern.

A method for laminating an assembled sandwich structure consisting of a functional part (4) and one glass article (5) separated from an outer surface of the functional part by a laminating film (6) by heating with electromagnetic radiation in a vacuum is described. In the method equal temperatures of all sandwich components are provided by selection of the optimal radiation frequencies. The optimal vacuum level is provided following the laminating film temperature.

Systems and techniques to provide a flexible, lightweight material that is also effective at protecting a body from ballistic threats are described. An example composite material described herein is fiber-based, and it includes one or more first regions where the fiber composite material is consolidated, and one or more second regions where the fiber composite material is unconsolidated. Example methods of manufacturing the composite material disclosed herein include using a specialized tool with a heated platen press or an autoclave. The tool may include one or more protrusions and/or cavities that contact a precursor composite material to transform the precursor material into a partially consolidated fiber composite material, which is suitable for use as body armor, among other potential applications for the manufactured composite material.

A composite material (10) comprising: a base layer (48); a plurality of protective plates (41, 51, 51a, 51b) located on the base layer (48); an attaching means (43) to connect the base layer (48) to the protective plates (41),
wherein
the attaching means (43) is positioned along a first direction (46) on the base layer (48) to resist pivoting of each protective plate (41, 51, 51a, 51b) about an axis normal to the base layer (48).