Abstract: A system to simulate pyrotechnic shock may include a pulse or signal generator to generate a predetermined signal waveform. A signal conditioning device may be included to condition the predetermined signal waveform to produce a predetermined shock simulation for a shock test. The system may also include a power amplifier to amplify the conditioned predetermined signal waveform to a chosen amplitude to produce a selected level of shock. A shaker system produces the selected level of shock in response to an amplified signal waveform from the power amplifier. A shock measuring device measures a shock imparted to the test specimen, and an output device presents a result of the shock test on the test specimen.

Abstract: A system to simulate pyrotechnic shock may include a pulse or signal generator to generate a predetermined signal waveform. A signal conditioning device may be included to condition the predetermined signal waveform to produce a predetermined shock simulation for a shock test. The system may also include a power amplifier to amplify the conditioned predetermined signal waveform to a chosen amplitude to produce a selected level of shock. A shaker system produces the selected level of shock in response to an amplified signal waveform from the power amplifier. A shock measuring device measures a shock imparted to the test specimen, and an output device presents a result of the shock test on the test specimen.

Abstract: A system for inducing shock may include a first slap plate attached to a shaker armature of a shaker table system to impart a shock to any object being tested by the system. The shock is amplifiable by use of the first slap plate compared to the object being coupled to the shaker armature without the first slap plate. The system may also include a specific attachment arrangement for attaching the first slap plate to the shaker armature. The specific attachment arrangement and a configuration of the first slap plate may be selected to control a level of shock imparted to the object being tested.

Abstract: A process for producing high grade polyethylene paper on conventional continuous wet-lay papermaking equipment. In particular, the process comprises preparing a furnish of 75-99 wt. % oriented polyethylene pulp, 0.5-15 wt. % fibrous stabilizing agent and 0.5-10 wt. % strengthening agent and depositing the furnish on the forming screen of a conventional wet-lay papermaking machine. The resulting waterleaf sheet is dried on heated drying cans and then thermally bonded to provide a high grade polyethylene paper having high dry strength and toughness, exceptional dimensional stability and superior uniformity (i.e., no holes). The high grade polyethylene paper made by the inventive process is particularly useful in microfiltration end-uses such as vacuum cleaner bags.

Abstract: Lightweight nonwoven sheets of polyethylene plexifilamentary film-fibril strands are made by a stretching-and-bonding operation in which the unit weight of the sheet is decreased in stages while at a temperature within 3.degree. to 8.degree. C. of the melting point of the polyethylene. The resultant sheet has a novel combination opacity, X-ray scattering and physical characteristics and is particularly suited for sterile packaging, lightweight envelopes and surgical drapes.

Abstract: A security paper is provided in which identifying material is contained as an intercalary layer within the thickness of a bonded, nonwoven, polyethylene-film-fibril sheet having an opacity of at least 70% and a delamination resistance of at least 60 grams per centimeter. A process for making such paper includes forming an assembly of two unbonded, lightly consolidated, nonwoven, polyethylene film-fibril sheets containing identifying material between them, compressing the assembly in an unheated nip at 17 to 85 kilograms per centimeter of assembly width and then self-bonding the compressed assembly while under restraint by contact with a heated drum. Such security paper is useful for bank notes, stock certificates, paper currency and the like.

Abstract: A security paper is provided in which identifying material is contained in a plane within the thickness of a bonded, nonwoven polyethylene film-fibril sheet having an opacity of at least 70% and a determination resistance of at least 60 grams per centimeter. A process for making such paper includes forming an assembly of two unbonded, lightly consolidated, nonwoven, polyethylene film-fibril sheets containing identifying material between them, compressing the assembly in an unheated nip at 17 to 85 kilograms per centimeter of assembly width and then self-bonding the compressed assembly while under restraint by contact with a heated drum. Such security paper is useful for bank notes, stock certificates, paper currency and the like.