Abstract:
A multi-calender process for forming a high modulus, high strength component for use in ballistic-resistant articles. The process includes forming ultrahigh molecular weight polyethylene powder into a uniform sheet at a low pressure. Multiple calender units mold and draw the uniform sheet into a non-fibrous, monolithic, ultra high molecular weight polyethylene tape. The multi-calender process and subsequent draw stages stretch the non-fibrous UHMWPE tape to a total draw of at least 100 to 1 to produce a high modulus, high strength UHMWPE component with a modulus of 1,400 grams per denier or greater. The multi-calender process of the present invention enables production of a high-strength, high-modulus UHMWPE component for ballistic-resistant articles and other applications at significantly higher rates and at a lower unit cost.
Abstract:
Die Erfindung betrifft eine ein- oder mehrschichtige, orientierte Folie aus einem thermoplastischen Polymer, das mindestens ein nanopartikuläres, im sichtbaren Bereich weitgehend transparentes Metalloxid als IR-aktive Komponente enthält, die zur IRAbschirmung dient, ein Verfahren zur Herstellung der Folie und ihre Verwendung als Isolationsmaterial, z.B. in Fensteranwendungen und als Abschirmung von elektrischen Bauteilen aller Art. Die Erfindung betrifft ferner ein Verfahren zur Herstellung des Rohstoffs, welcher das nanopartikuläre transparente Metalloxid enthält.
Abstract:
The present invention relates to a process of preparing non-laminated blended biaxially orientation extruded polyester film without any co-extrusion layers with the voids being dispersed in the monolayered film for applications as base material for label, poster, recording paper, wrapping paper including reflector of a surface light source for illuminating a scope of liquid crystal displays or electronic decorative boards. Such films exhibit % transmission of 10 % max, reflection at 450 nm, 550 nm and 650 nm of > 90 %. An appropriately blended composition comprising a mix polyester, a polycondensed resin of a dicarboxylic ester and polyhydric alcohols, density reducing polymers, optical brightners and inorganic particles is extruded and processed to produce the non-laminated biaxially oriented polyester film.
Abstract:
The device (2) comprises four drawing cylinders (6, 7, 8, 9) on which the film (5) passes and which are associated with press cylinders (13, 21, 26), comprising: a first drawing cylinder (6) having a fixed axis (10), a second drawing cylinder (7) having a fixed axis (12) which is offset in relation to the previous one, a third drawing cylinder (8) whose position is adjustable and a fourth drawing cylinder (9) having a fixed axis (25). Said cylinders (6 A 9) are rotationally driven at differentiated speeds, such that a first drawing stage is formed between the second cylinder (7) and the third cylinder (8), whereby the drawing distance (D) is preferably adjustable, and a second drawing stage is formed between the third cylinder (8) and the fourth cylinder (9). The invention is used for the longitudinal drawing of synthetic films.
Abstract:
A nonwoven web is described that is a thin porous polytetrafluoroethylene membrane consisting essentially of a nonwoven web having a microstructure of substantially only microfibrils fused at crossover points. It is usually strong, is unusually thin, has unusually small pore sizes, but a very high air flow-through. It has a pore size between 0.05 and 0.4 micrometers; a bubble point between 10 and 60 psi; a pore size distribution value between 1.05 and 1.20; a ball burst strength between 0.9 and 17 pounds/force; an air flow of between 20 Frazier and 10 Gurley seconds; a thickness between 1.0 - 25.4 micrometers; and a fiber diameter ranging between 5 and 200 nm.
Abstract:
A biaxially oriented polyester film wherein the ratio R (= IMD/IND) of the peak intensity (IMD) in the lengthwise direction to the peak intensity (IND) in the thicknesswise direction determined at 1615 cm by the laser Raman scattering technique equals or exceeds 6; and a process for the production of a biaxially oriented polyester film which comprises controlling the ratio (A/B) of the maximum thickness (A) of the edge of a cast film to the thickness (B) of the central portion with respect to the width thereof to be within the range of 2 to 6, biaxially stretching the cast film, and controlling the peak intensity ratio of the biaxially oriented film determined by the laser Raman scattering technique to be within the aforementioned range. The biaxially oriented polyester film thus produced has a specific orientation in the lengthwise direction, and therefore has great lengthwise strength and small irregularity in properties, such as thickness or double refraction.
Abstract:
A method for producing a polytetrafluoroethylene (PTFE) tape with a density no greater than 0.3 g/cm3, wherein a first stretching step is carried out on a raw PTFE tape (A, B) to reduce its density to 0,7-0,3 g/cm3, whereafter a step of the kind comprising a stabilization phase is performed on the tape without altering the state of the PTFE, by passing said tape through an oven (F2) at a temperature and for a time which are dependent on the mass to be stabilized, the tape being held taut to prevent any increase in density. The tape is then hot-stretched to reduce the density to a value of 0.2-0.12 g/cm3. Said porous PTFE tape is useful particularly as an insulating covering for a coaxial cable.
Abstract:
Die Erfindung betrifft eine Vorrichtung (10) zum Verhindern von Staublasen (43) bei der Produktion einer doppelten, flach gelegten Folienbahn (40), aufweisend eine Perforationsvorrichtung (20) mit mindestens einem Perforationselement (21), wobei das mindestens eine Perforationselement (21) derart positioniert ist, dass bei einem Anordnen der Perforationsvorrichtung (20) an der Folienbahn (40) das Perforationselement (21) die Folienbahn (40) durchdringt und dadurch in einem Randbereich (41) der Folienbahn (40) Durchgangslöcher (42) in der Folienbahn (40) erzeugt. Ferner betrifft die Erfindung ein Verfahren zum Herstellen einer Folienbahn (40) unter Verwendung einer derartigen Vorrichtung (10) sowie eine Reckvorrichtung (70) mit einer derartigen Vorrichtung (10) und/oder ausgebildet für ein derartiges Verfahren.